Safety guard for a crane luffing mechanism

Abstract

The utility model relates to a crane amplitude -variable mechanism technical field, the utility model discloses a safety device of crane amplitude -variable mechanism, including first mounting seat, first bearing seat, fixed pipe and antenna, first mounting seat upper surface and first bearing seat lower surface fixed connection, first bearing seat upper surface and fixed pipe lower end fixed connection, the utility model sets up limiting mechanism and auxiliary mechanism through, limiting mechanism is used to detect the upper limit and lower limit of amplitude -variable mechanism, and auxiliary mechanism is used to assist the detection process, solved the safety protection of current crane amplitude -variable mechanism's deficiency, lack high -efficient reliable safety monitoring and limiting protection device, this leads to in the operation, amplitude -variable angle too big or the travel of carrying rod exceeds the design range, possibly the instability, deformation or overturning accident, because lack real -time monitoring and intervention, and the operator is difficult to find the risk in time, and the equipment can operate under the limit working condition, increase the safe risk problem.

Description

Technical Field

[0001] This utility model belongs to the technical field of crane luffing mechanism, and in particular relates to a safety protection device for crane luffing mechanism. Background Technology

[0002] A crane luffing mechanism is a mechanical transmission system used to change the angle between the boom and the horizontal plane. Its core function is to adjust the working radius and lifting height by driving the boom to rotate or extend around a fixed fulcrum, so as to meet the precise control requirements of material lifting position under different working conditions. This mechanism is usually composed of a drive device (such as hydraulic cylinder, motor reducer, etc.), transmission components (such as gears, racks, wire ropes, etc.), support structure (such as hinge seats, bearings, etc.), and safety control system. It is widely used in various lifting equipment such as gantry cranes, tower cranes, and truck cranes, and plays an important role in engineering construction, port loading and unloading, equipment manufacturing and other fields.

[0003] Existing cranes lack a safety protection device for the luffing mechanism and a dual protection mechanism for its operation. The problems with the aforementioned technologies are as follows: existing cranes still have significant deficiencies in the safety protection of the luffing mechanism, lacking an efficient and reliable safety monitoring and limit protection device. This makes it easy for accidents such as instability, structural deformation, or even overturning to occur during actual operation due to excessive luffing angle or the extension stroke of the load-bearing rod exceeding the design range. Due to the lack of real-time monitoring and effective intervention methods for the luffing motion, operators often cannot detect potential risks in time, causing the equipment to continue operating under extreme conditions, further exacerbating safety hazards. In addition, traditional structures lack buffering and reset functions when the load-bearing rod reaches its limit position, which can easily cause mechanical impact and fatigue damage, affecting the service life of the equipment. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model provides a safety protection device for crane luffing mechanism that can overcome the above problems or at least partially solve the above problems.

[0005] This utility model is implemented as follows: a safety protection device for a crane luffing mechanism includes a first mounting base, a first bearing seat, a fixed tube, and an antenna. The upper surface of the first mounting base is fixedly connected to the lower surface of the first bearing seat, the upper surface of the first bearing seat is fixedly connected to the lower end of the fixed tube, one side of the fixed tube is fixedly connected to the lower end of the antenna, several limiting mechanisms are provided on both sides of the fixed tube, and an auxiliary mechanism is provided on the upper end of the fixed tube.

[0006] The limiting mechanism is used to detect the upper and lower limits of the amplitude-changing mechanism;

[0007] The auxiliary mechanism is used to assist the detection process.

[0008] To improve the flexibility of the device, the limiting mechanism preferably includes a bearing rod, a connecting plate, a push plate, a sliding wheel, a support rod, and an elastic block. The lower surface of the bearing rod is fixedly connected to the lower surface of the connecting plate, the upper surface of the connecting plate is fixedly connected to the lower surface of the push plate, the surface of the push plate contacts the surface of the sliding wheel, the inner wall of the sliding wheel is rotatably connected to the upper end of the support rod, and the lower surface of the support rod is fixedly connected to the front surface of the elastic block. The sliding wheel can adaptively adjust the direction of force during the push process, avoiding jamming or wear caused by rigid contact, thereby extending the service life of the component. Simultaneously, the elastic block provides the necessary reset capability for the sliding wheel. When the sliding wheel disengages from the push plate, it can automatically return to its initial position under the elastic force of the elastic block, facilitating the smooth progress of the next testing cycle.

[0009] To improve the reliability of the device, preferably, the auxiliary mechanism includes an installation tube, a telescopic rod, a spring, a guide rod, and a flexible plate. The upper end of the inner wall of the installation tube is fixedly connected to the upper end of the telescopic rod. The spring is sleeved on the surface of the telescopic rod. The lower end of the telescopic rod is fixedly connected to the upper end of the guide rod. The lower end of the guide rod is fixedly connected to the inner wall of the flexible plate. The telescopic rod not only achieves an effective connection between the flexible plate and the installation tube, but also serves as an elastic support element during the movement of the guide rod, allowing the guide rod to slide flexibly within the installation tube while maintaining good axial stability. In addition, the telescopic rod and the spring work together to provide reliable buffering capacity when the load-bearing rod reaches its limit position, preventing mechanical damage caused by excessive impact load.

[0010] To improve the safety of the luffing mechanism, preferably, fixed plates are provided on both sides of the fixed tube, and contact sensors are provided on the surface of the fixed plates. The surface of the fixed plates is fixedly connected to the surface of the contact sensors. A second bearing seat is provided at the upper end of the bearing rod, and a second mounting seat is provided at the upper end of the second bearing seat. The upper end of the second bearing seat is fixedly connected to the surface of the second mounting seat. Multiple contact sensors are distributed at intervals along the surface of the fixed tube to form a continuous monitoring area for the movement path of the push plate, thereby realizing the identification of different extension and retraction positions of the bearing rod. This provides basic data support for real-time monitoring of the luffing angle, which is conducive to the control system to judge the status of the boom in a timely manner and take corresponding safety control measures.

[0011] To improve the adaptability of the device operation, preferably, the inner surface of the fixed tube is slidably connected to the surface of the bearing rod, the surface of the connecting plate is slidably connected to the surface of the fixed tube through a groove, the surface of the push plate is slidably connected to the outer surface of the fixed tube, the lower end of the support rod is slidably connected to the surface of the fixed tube through a groove, and the rear surface of the elastic block is fixedly connected to the surface of the fixed tube. The bearing rod can freely extend and retract axially inside the fixed tube, thereby adapting to the displacement requirements caused by the angle change during the amplitude variation process.

[0012] To improve operational stability, preferably, the two side surfaces of the mounting tube are fixedly connected to the upper surface of the fixed tube by bolts, the surface of the guide rod is slidably connected to the inner wall of the mounting tube by a sliding groove, and the upper surface of the flexible plate is in contact with the lower surface of the mounting tube. The contact between the flexible plate and the mounting tube makes the flexible plate a buffer contact interface when the load-bearing rod is at its limit position. When the load-bearing rod extends to its maximum stroke, the push plate pushes the flexible plate, causing it to undergo elastic deformation and drive the guide rod to move upward, thereby activating the limit protection mechanism.

[0013] To improve operational coordination, preferably, the surface of the contact sensor contacts the surface of the sliding wheel, the two side surfaces of the fixed tube are fixedly connected to the lower surface of the fixed plate, the lower end of the second bearing seat is fixedly connected to the upper end of the bearing rod, and the surface of the contact sensor contacts the surface of the sliding wheel, so that when the push plate pushes the sliding wheel to move outward along the fixed tube, the sliding wheel can contact the contact sensor at the corresponding position and trigger a signal output, thereby enabling real-time monitoring of the displacement state of the bearing rod, providing accurate position feedback information for the control system, and effectively preventing the amplitude angle from exceeding the safe range.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention incorporates a limiting mechanism, an auxiliary mechanism, a bearing rod, a push plate, a sliding wheel, an elastic block, a mounting tube, a telescopic rod, a spring, and a flexible plate. The limiting mechanism detects the upper and lower limits of the amplitude-changing mechanism, while the auxiliary mechanism assists in the detection process. The sliding wheel, pushed by the push plate, adaptively adjusts its force direction, preventing jamming or wear caused by rigid contact and thus extending the component's service life. Simultaneously, the elastic block provides the necessary reset capability for the sliding wheel; after disengaging from the push plate, it automatically returns to its initial position under the elastic force of the block, facilitating smooth operation in the next detection cycle. The telescopic rod not only effectively connects the flexible plate and the mounting tube but also serves as an elastic support element during the guide rod's movement, ensuring the guide rod... The telescopic rod can slide flexibly within the mounting tube while maintaining good axial stability. Furthermore, the telescopic rod works in conjunction with the spring to provide reliable buffering when the load-bearing rod reaches its limit position, preventing mechanical damage caused by excessive impact loads. This addresses the current shortcomings in the safety protection of crane luffing mechanisms, which lack efficient and reliable safety monitoring and limit protection devices. This leads to potential instability, deformation, or overturning accidents when the luffing angle is too large or the load-bearing rod stroke exceeds the design range during operation. Due to the lack of real-time monitoring and intervention, operators struggle to detect risks in time, and the equipment may operate under extreme conditions, increasing safety risks. In addition, traditional structures lack buffering and reset functions at the load-bearing rod's limit position, easily leading to mechanical impact and fatigue damage, affecting service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main three-dimensional structure provided in an embodiment of the present utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the lower end of the main body provided in an embodiment of this utility model;

[0018] Figure 3 This is a three-dimensional structural diagram of the limiting mechanism provided in this embodiment of the utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the auxiliary mechanism provided in an embodiment of this utility model.

[0020] In the diagram: 1. Limiting mechanism; 101. Bearing rod; 102. Connecting plate; 103. Push plate; 104. Sliding wheel; 105. Support rod; 106. Elastic block; 2. Auxiliary mechanism; 201. Mounting tube; 202. Telescopic rod; 203. Spring; 204. Guide rod; 205. Flexible plate; 3. Fixing plate; 4. Contact sensor; 5. Second bearing seat; 6. Second mounting seat; 7. First mounting seat; 8. First bearing seat; 9. Fixing tube; 10. Antenna. Detailed Implementation

[0021] To further understand the invention content, features and effects of this utility model, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0022] The structure of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1 to 4As shown in the figure, a safety protection device for a crane luffing mechanism provided by this utility model embodiment includes a first mounting base 7, a first bearing seat 8, a fixed tube 9, and an antenna 10. The upper surface of the first mounting base 7 is fixedly connected to the lower surface of the first bearing seat 8, and the upper surface of the first bearing seat 8 is fixedly connected to the lower end of the fixed tube 9. One side of the fixed tube 9 is fixedly connected to the lower end of the antenna 10. Several limiting mechanisms 1 are provided on both sides of the fixed tube 9, and an auxiliary mechanism 2 is provided at the upper end of the fixed tube 9. The limiting mechanisms 1 are used to detect the upper and lower limits of the luffing mechanism, and the auxiliary mechanism 2 is used to assist the detection process. The limiting mechanism 1 includes a bearing rod 101, a connecting plate 102, a push plate 103, a sliding wheel 104, a support rod 105, and an elastic block 106. The lower end of the bearing rod 101... The surface of the sliding wheel 104 is fixedly connected to the lower surface of the connecting plate 102, and the upper surface of the connecting plate 102 is fixedly connected to the lower surface of the push plate 103. The surface of the push plate 103 contacts the surface of the sliding wheel 104. The inner wall of the sliding wheel 104 is rotatably connected to the upper end of the support rod 105, and the lower surface of the support rod 105 is fixedly connected to the front surface of the elastic block 106. The sliding wheel 104 can adaptively adjust the force direction during the push process of the push plate 103, avoiding jamming or wear caused by rigid contact, thereby extending the service life of the component. At the same time, the elastic block 106 provides the necessary reset capability for the sliding wheel 104. When the sliding wheel 104 is disengaged from the push plate 103, it can automatically return to the initial position under the elastic force of the elastic block 106, which facilitates the smooth operation of the next inspection cycle. The auxiliary mechanism 2 includes an installation tube 201, a telescopic rod 202, a spring 203, a guide rod 204, and a flexible plate 205. The upper end of the inner wall of the installation tube 201 is fixedly connected to the upper end of the telescopic rod 202. The spring 203 is sleeved on the surface of the telescopic rod 202. The lower end of the telescopic rod 202 is fixedly connected to the upper end of the guide rod 204. The lower end of the guide rod 204 is fixedly connected to the inner wall of the flexible plate 205. The telescopic rod 202 not only achieves an effective connection between the flexible plate 205 and the installation tube 201, but also serves as an elastic support element during the movement of the guide rod 204, allowing the guide rod 204 to slide flexibly within the installation tube 201 while maintaining good axial stability. Furthermore, the telescopic rod 202 and the spring 203 work together to ensure that the support rod 101 reaches... The system provides reliable buffering at extreme positions to prevent mechanical damage caused by excessive impact loads. Fixed plates 3 are installed on both sides of the fixed tube 9, and contact sensors 4 are fixedly connected to the surfaces of the fixed plates 3 and the contact sensors 4. A second bearing seat 5 is installed at the upper end of the bearing rod 101, and a second mounting seat 6 is installed at the upper end of the second bearing seat 5, with the upper end of the second bearing seat 5 fixedly connected to the surface of the second mounting seat 6. Multiple contact sensors 4 are spaced apart along the surface of the fixed tube 9, forming a continuous monitoring area for the movement path of the push plate 103. This enables the identification of different extension and retraction positions of the bearing rod 101, providing basic data support for real-time monitoring of the luffing angle. This facilitates the control system in promptly determining the boom's status and taking corresponding safety control measures.The inner surface of the fixed tube 9 is slidably connected to the surface of the bearing rod 101. The surface of the connecting plate 102 is slidably connected to the surface of the fixed tube 9 via a groove. The surface of the push plate 103 is slidably connected to the outer surface of the fixed tube 9. The lower end of the support rod 105 is slidably connected to the surface of the fixed tube 9 via a groove. The rear surface of the elastic block 106 is fixedly connected to the surface of the fixed tube 9. The bearing rod 101 can freely extend and retract axially inside the fixed tube 9 to adapt to the displacement requirements caused by angle changes during the amplitude transformation process. The two sides of the mounting tube 201 are fixedly connected to the upper surface of the fixed tube 9 via bolts. The surface of the guide rod 204 is slidably connected to the inner wall of the mounting tube 201 via a groove. The upper surface of the flexible plate 205 is in contact with the lower surface of the mounting tube 201. The contact between the flexible plate 205 and the mounting tube 201 makes the flexible plate 205 a buffer when the bearing rod 101 is at its extreme position. At the contact interface, when the bearing rod 101 extends to its maximum stroke, the push plate 103 pushes the flexible plate 205, causing it to elastically deform and drive the guide rod 204 upward, thereby activating the limit protection mechanism. The surface of the contact sensor 4 contacts the surface of the sliding wheel 104, the two sides of the fixed tube 9 are fixedly connected to the lower surface of the fixed plate 3, and the lower end of the second bearing seat 5 is fixedly connected to the upper end of the bearing rod 101. The surface of the contact sensor 4 contacts the surface of the sliding wheel 104, so that when the push plate 103 pushes the sliding wheel 104 to move outward along the fixed tube 9, the sliding wheel 104 can contact the contact sensor 4 at the corresponding position and trigger a signal output. This enables real-time monitoring of the displacement state of the bearing rod 101, providing accurate position feedback information for the control system, thereby effectively preventing the amplitude angle from exceeding the safe range.

[0024] The working principle of this utility model:

[0025] During the operation of the luffing mechanism of the crane, the first mounting base 7 and the second mounting base 6 are first fixed to both ends of the luffing mechanism with high-strength bolts to ensure the stability and reliability of the entire device during operation. When the luffing mechanism starts working and the angle is adjusted, the bearing rod 101 on the second mounting base 6 will slide axially within the fixed tube 9 set in the first mounting base 7 as the boom angle changes. The surface of the bearing rod 101 is provided with a connecting plate 102, which is connected to the push plate 103. As the bearing rod 101 moves, the push plate 103 will move synchronously along the groove on the outside of the fixed tube 9. Multiple contact sensors 4 are symmetrically distributed on both sides of the fixed tube 9. These sensors are arranged at a certain interval to detect the position of the push plate 103. When the push plate 103 moves to a specific position with the bearing rod 101, its edge will contact the sliding wheel 104 and push the sliding wheel 104 and the support rod 105 below it to move outward along the groove. As the sliding wheel 104 moves, the push plate 103 will eventually move outward. It will come into contact with the corresponding contact sensor 4. At this time, the contact sensor 4 will trigger a signal output, transmitting the position information of the current bearing rod 101 to the control system, thereby realizing real-time monitoring of the luffing angle. In this way, the angle state of the luffing mechanism can be determined according to the triggering of the contact sensor 4 at different positions, and timely warnings or control measures can be taken to prevent the boom from exceeding the safe range, which could lead to instability of the whole machine or even overturning accidents. In addition, when the bearing rod 101 extends to its limit position, the push plate 103 will contact the flexible plate 205 set at the upper end of the fixed tube 9. As the bearing rod 101 continues to extend forward, the flexible buffer plate will undergo elastic deformation and push the guide rod 204 to slide inside the mounting tube 201. The upper end of the guide rod 204 is connected to the telescopic rod 202 and the spring 203, which can not only play a buffering role and protect the mechanical parts from impact damage, but also effectively limit the maximum extension stroke of the bearing rod 101 to prevent it from over-extending and causing structural failure or safety hazards.

[0026] The specific models and specifications of the bearing housing, elastic block, telescopic rod, spring, and contact sensor proposed in this application need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt the existing technology in this field, so they will not be described in detail here.

[0027] The wiring connection method and control method of the contact sensor proposed in this application are all existing technologies in this field, and therefore will not be described in detail.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can exercise their rights without departing from the scope of the present utility model.

Claims

1. A safety protection device for a crane luffing mechanism, comprising a first mounting base (7), a first bearing seat (8), a fixing tube (9), and an antenna (10), wherein the upper surface of the first mounting base (7) is fixedly connected to the lower surface of the first bearing seat (8), the upper surface of the first bearing seat (8) is fixedly connected to the lower end of the fixing tube (9), and one side of the fixing tube (9) is fixedly connected to the lower end of the antenna (10), characterized in that: The fixed tube (9) has several limiting mechanisms (1) on both sides, and an auxiliary mechanism (2) is provided at the upper end of the fixed tube (9). The limiting mechanism (1) is used to detect the upper and lower limits of the amplitude-changing mechanism; The auxiliary mechanism (2) is used to assist the detection process.

2. The safety protection device for a crane luffing mechanism as described in claim 1, characterized in that: The limiting mechanism (1) includes a bearing rod (101), a connecting plate (102), a push plate (103), a sliding wheel (104), a support rod (105), and an elastic block (106). The lower surface of the bearing rod (101) is fixedly connected to the lower surface of the connecting plate (102), the upper surface of the connecting plate (102) is fixedly connected to the lower surface of the push plate (103), the surface of the push plate (103) is in contact with the surface of the sliding wheel (104), the inner wall of the sliding wheel (104) is rotatably connected to the upper end of the support rod (105), and the lower surface of the support rod (105) is fixedly connected to the front surface of the elastic block (106).

3. A safety protection device for a crane luffing mechanism as described in claim 2, characterized in that: The auxiliary mechanism (2) includes an installation tube (201), a telescopic rod (202), a spring (203), a guide rod (204), and a flexible plate (205). The upper end of the inner wall of the installation tube (201) is fixedly connected to the upper end of the telescopic rod (202). The spring (203) is sleeved on the surface of the telescopic rod (202). The lower end of the telescopic rod (202) is fixedly connected to the upper end of the guide rod (204). The lower end of the guide rod (204) is fixedly connected to the inner wall of the flexible plate (205).

4. A safety protection device for a crane luffing mechanism as described in claim 3, characterized in that: The fixed tube (9) is provided with a fixed plate (3) on both sides. A contact sensor (4) is provided on the surface of the fixed plate (3). The surface of the fixed plate (3) is fixedly connected to the surface of the contact sensor (4). A second bearing seat (5) is provided at the upper end of the bearing rod (101). A second mounting seat (6) is provided at the upper end of the second bearing seat (5). The upper end of the second bearing seat (5) is fixedly connected to the surface of the second mounting seat (6).

5. A safety protection device for a crane luffing mechanism as described in claim 2, characterized in that: The inner surface of the fixed tube (9) is slidably connected to the surface of the bearing rod (101), the surface of the connecting plate (102) is slidably connected to the surface of the fixed tube (9) through a groove, the surface of the push plate (103) is slidably connected to the outer surface of the fixed tube (9), the lower end of the support rod (105) is slidably connected to the surface of the fixed tube (9) through a groove, and the rear surface of the elastic block (106) is fixedly connected to the surface of the fixed tube (9).

6. A safety protection device for a crane luffing mechanism as described in claim 3, characterized in that: The two sides of the mounting tube (201) are fixedly connected to the upper surface of the fixing tube (9) by bolts. The surface of the guide rod (204) is slidably connected to the inner wall of the mounting tube (201) by a groove. The upper surface of the flexible plate (205) is in contact with the lower surface of the mounting tube (201).

7. A safety protection device for a crane luffing mechanism as described in claim 4, characterized in that: The surface of the contact sensor (4) is in contact with the surface of the sliding wheel (104), the two sides of the fixed tube (9) are fixedly connected to the lower surface of the fixed plate (3), and the lower end of the second bearing seat (5) is fixedly connected to the upper end of the bearing rod (101).

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