Bridge crane with overload protection warning function
By installing load cells and temporary support mechanisms on the bridge crane, the load is monitored in real time and lifting is stopped when the preset upper limit is reached, which solves the problem of motor damage caused by overload, reduces maintenance costs and improves safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN SHENZHOU HEAVY MASCH CO LTD
- Filing Date
- 2025-08-04
- Publication Date
- 2026-05-29
AI Technical Summary
Existing technologies cannot take timely measures before overload occurs, leading to crane motor damage and safety accidents, and high maintenance costs.
Load cells are installed on bridge cranes to monitor the load weight in real time. Lifting stops when the preset upper limit is reached. Combined with temporary support mechanisms, the sensors are easy to maintain, and overload is prevented.
It implements overload protection and early warning, avoids damage to the electric hoist motor, reduces maintenance costs, and ensures the safe operation of the crane.
Smart Images
Figure CN224298751U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of crane technology, specifically relating to a bridge crane with overload protection and early warning function. Background Technology
[0002] Overloading a crane trolley can lead to a series of serious consequences: First, it can directly cause deformation of the metal structure (such as main beam deflection and track twisting), accelerating the wear of components; second, it may cause critical system failures such as wire rope breakage, motor burnout, and brake failure; and in more serious cases, it may cause major safety accidents such as the entire machine overturning or the load falling. Therefore, certain measures need to be taken to avoid overloading.
[0003] In the prior art, Chinese utility model patent document with authorization announcement number CN222935012U discloses a lifting overload protection device for a crane. When the motor fails and the goods fall from a height, the winding shaft will rotate at high speed. Through centrifugal force, the striking block can strike the tactile switch. The hydraulic cylinder drives the friction plate to move downward and press it against the outer surface of the friction block, thus achieving a braking effect and stopping the rotation of the winding shaft. It can be seen that the above-mentioned prior art can prevent accidents after the motor is overloaded and damaged, but it cannot take timely measures to prevent motor damage before an overload occurs.
[0004] Therefore, there is a need for a bridge crane with overload protection and early warning functions that can prevent overload, reduce maintenance costs, and ensure the safe operation of the crane to solve the current technical problems. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a bridge crane with overload protection and early warning functions that can prevent overload, reduce maintenance costs, and ensure the safe operation of the crane.
[0006] The technical solution of this utility model is as follows: a bridge crane with overload protection and early warning function, including a trolley base frame, a portal frame fixedly installed on the top of the trolley base frame, an electric hoist slidably installed below the portal frame along the vertical direction, a hanging plate symmetrically fixedly installed on the outer shell of the electric hoist, the hanging plate slidingly passing through the portal frame, a frame plate parallel to the top of the hanging plate fixedly installed at the top of the hanging plate, a weighing sensor corresponding to the frame plate installed at the top of the portal frame, and a temporary support mechanism installed on the frame plate.
[0007] Furthermore, the temporary support mechanism has a screw that is threaded perpendicularly to the frame plate, a support plate is rotatably provided at the bottom end of the screw below the frame plate, a rocker arm is fixedly provided at the top end of the screw, and a handle is rotatably provided at the top end of the rocker arm opposite to the screw.
[0008] Furthermore, the top of the gantry frame is provided with a sensor fixing mechanism that matches the bottom end of the weighing sensor, the sensor fixing mechanism being used to clamp or release the weighing sensor.
[0009] Furthermore, the sensor fixing mechanism has a fixed clamping plate fixedly installed on the top of the gantry frame, the fixed clamping plate corresponding to one side of the bottom end of the weighing sensor, a movable clamping plate slidably installed on the top of the gantry frame corresponding to the other side of the bottom end of the weighing sensor, a clamping bolt rotatably installed on the outer side of the middle part of the movable clamping plate, and a support threadedly fitted on the outside of the clamping bolt fixedly installed on the top of the gantry frame.
[0010] Furthermore, both the moving clamp and the fixed clamp are semi-circular ring structures that match the weighing sensor.
[0011] Furthermore, two guide rods are respectively provided at the top of the portal frame and at both ends of the frame plate. The guide rods are vertically fixed at the top of the portal frame, and the frame plate is slidably fitted on the outside of the guide rods.
[0012] Furthermore, a limit plate is fixedly provided at the top end of the guide rod.
[0013] Furthermore, two weighing sensors are symmetrically arranged on the top of the gantry frame.
[0014] Furthermore, the weighing sensor is a TQ-F1 flange-type weighing sensor.
[0015] The beneficial effects of this utility model are:
[0016] (1) In this utility model, the electric hoist is fixed on the gantry frame by means of a weighing sensor and a frame plate. When the electric hoist lifts the heavy object, the weighing sensor can measure the load weight of the electric hoist in real time. When the load reaches the preset upper limit value, the electric hoist stops lifting, thereby avoiding overload and thus avoiding damage to the electric hoist motor due to overload, reducing maintenance costs and ensuring the safe operation of the crane.
[0017] (2) When the load cells are regularly maintained, the frame can be supported above the gantry frame by a temporary support mechanism so that there is enough space between the frame and the gantry frame to facilitate the inspection or replacement of the load cells between the frame and the gantry frame. Attached Figure Description
[0018] Figure 1 This is one of the structural schematic diagrams of a bridge crane with overload protection and early warning function in this utility model.
[0019] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.
[0020] Figure 3 This is the second structural schematic diagram of the bridge crane with overload protection and early warning function in this utility model. Detailed Implementation
[0021] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are not intended to limit the present invention or its application or use in any way. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values set forth in these embodiments should be interpreted as merely exemplary and not as limiting.
[0022] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0023] like Figures 1 to 3 As shown, a bridge crane with overload protection and early warning function is disclosed, including a trolley base frame 1, a gantry frame 2 fixedly mounted on the top of the trolley base frame 1, an electric hoist 3 slidably mounted below the gantry frame 2 along the vertical direction, a lifting plate 4 symmetrically fixedly mounted on the outer shell of the electric hoist 3, the lifting plate 4 slidingly penetrating the gantry frame 2, an avoidance opening 21 matching the lifting plate 4 on the gantry frame 2, a frame plate 5 parallel to the top of the lifting plate 4 fixedly mounted on the top of the lifting plate 4, a weighing sensor 6 corresponding to the frame plate 5 mounted on the top of the gantry frame 2, and a temporary support mechanism 8 mounted on the frame plate 5; in this embodiment, the electric hoist 3. The load cell 6 is fixed to the gantry frame 2 with the support plate 5. When the electric hoist 3 lifts the heavy object, the load cell 6 can measure the load weight of the electric hoist 3 in real time. When the load reaches the preset upper limit value, the electric hoist 3 stops lifting, thereby avoiding overload and preventing damage to the electric hoist motor due to overload, reducing maintenance costs and ensuring the safe operation of the crane. When the load cell 6 is maintained regularly, the support plate 5 can be supported above the gantry frame 2 by the temporary support mechanism 8, so as to facilitate the inspection or replacement of the load cell 6 between the support plate 5 and the gantry frame 2.
[0024] In some embodiments, the temporary support mechanism 8 has a screw 82 that is threaded perpendicularly to the frame plate 5. A support plate 81 is rotatably mounted on the bottom end of the screw 82 below the frame plate 5. A rocker arm 83 is fixedly mounted on the top end of the screw 82. A handle 84 is rotatably mounted on the top end of the rocker arm 83 that is away from the screw 82. When the weighing sensor 6 is regularly maintained, the rocker arm 83 is first rotated by the handle 84. The rocker arm 83 drives the screw 82 to rotate. The threaded structure between the screw 82 and the frame plate 5 drives the support plate 81 to move. The support plate 81 can abut against the gantry frame 2 and lift the frame plate 5 upward to facilitate the inspection or replacement of the weighing sensor 6.
[0025] In some embodiments, the top of the gantry frame 2 is provided with a sensor fixing mechanism 7 that matches the bottom end of the load cell 6. The sensor fixing mechanism 7 is used to clamp or release the load cell 6. After the load cell 6 is released, it can be replaced.
[0026] In some embodiments, the sensor fixing mechanism 7 has a fixed clamping plate 71 fixedly installed on the top of the gantry frame 2, which corresponds to one side of the bottom end of the load cell 6. A movable clamping plate 72 is slidably installed on the top of the gantry frame 2, which corresponds to the other side of the bottom end of the load cell 6. A clamping bolt 74 is rotatably installed on the outer side of the middle part of the movable clamping plate 72. A support 73 threadedly fitted on the outer side of the clamping bolt 74 is fixedly installed on the top of the gantry frame 2. When the clamping bolt 74 is rotated, the threaded structure between the clamping bolt 74 and the support 73 engages, which can drive the movable clamping plate 72 to move closer to or away from the fixed clamping plate 71, thereby clamping or releasing the load cell 6.
[0027] In some embodiments, the moving clamp 72 and the fixed clamp 71 are both semi-circular ring structures that match the weighing sensor 6.
[0028] In some embodiments, two guide rods 9 are respectively provided at the top of the portal frame 2 and at both ends of the frame plate 5. The guide rods 9 are vertically fixed at the top of the portal frame 2, and the frame plate 5 is slidably fitted on the outside of the guide rods 9. The guide rods 9 provide sliding support for the frame plate 5, so that the frame plate 5 can slide vertically above the portal frame 2. Specifically, a limit plate 91 is fixedly provided at the top of the guide rod 9. The limit plate 91 is used to prevent the frame plate 5 from slipping off the guide rod 9.
[0029] In some embodiments, two load cells 6 are symmetrically arranged on the top of the gantry frame 2; as a specific implementation of the load cell 6, the load cell 6 is a TQ-F1 flange type load cell.
[0030] In some embodiments, the bottom end of the flange-type load cell is bolted to the top of the gantry frame 2, in which case there is no need to install a sensor fixing mechanism 7 on the top of the gantry frame 2.
[0031] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.
[0032] The embodiments described above only illustrate some implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A bridge crane with overload protection and early warning function, characterized in that: The device includes a trolley chassis, a gantry frame fixedly mounted on the top of the trolley chassis, an electric hoist slidably mounted below the gantry frame in a vertical direction, symmetrical hanging plates fixedly mounted on the outer shell of the electric hoist, the hanging plates slidingly passing through the gantry frame, a frame plate parallel to the top of the hanging plate fixedly mounted on the top of the hanging plate, a weighing sensor corresponding to the frame plate mounted on the top of the gantry frame, and a temporary support mechanism mounted on the frame plate.
2. The bridge crane with overload protection and early warning function according to claim 1, characterized in that: The temporary support mechanism has a screw that is threaded perpendicularly to the frame plate. A support plate is rotatably mounted on the bottom end of the screw below the frame plate. A rocker arm is fixedly mounted on the top end of the screw. A handle is rotatably mounted on the top end of the rocker arm opposite to the screw.
3. The bridge crane with overload protection and early warning function according to claim 1, characterized in that: The top of the gantry frame is provided with a sensor fixing mechanism that matches the bottom end of the weighing sensor. The sensor fixing mechanism is used to clamp or release the weighing sensor.
4. The bridge crane with overload protection and early warning function according to claim 3, characterized in that: The sensor fixing mechanism has a fixed clamping plate fixedly installed on the top of the gantry frame, the fixed clamping plate corresponding to one side of the bottom end of the weighing sensor, a movable clamping plate slidably installed on the top of the gantry frame corresponding to the other side of the bottom end of the weighing sensor, a clamping bolt rotatably installed on the outer side of the middle part of the movable clamping plate, and a support threadedly fitted on the outside of the clamping bolt fixedly installed on the top of the gantry frame.
5. The bridge crane with overload protection and early warning function according to claim 4, characterized in that: Both the moving clamp and the fixed clamp are semi-circular ring structures that match the weighing sensor.
6. The bridge crane with overload protection and early warning function according to claim 1, characterized in that: Two guide rods are respectively provided at the top of the portal frame and at both ends of the frame plate. The guide rods are vertically fixed at the top of the portal frame, and the frame plate is slidably fitted on the outside of the guide rods.
7. The bridge crane with overload protection and early warning function according to claim 6, characterized in that: A limit plate is fixedly installed at the top of the guide rod.
8. The bridge crane with overload protection and early warning function according to claim 1, characterized in that: Two weighing sensors are symmetrically arranged on the top of the gantry frame.
9. The bridge crane with overload protection and early warning function according to claim 1, characterized in that: The weighing sensor is a TQ-F1 flange-type weighing sensor.