Grab bucket lifting limiting device of grab bucket bridge crane
By designing a combination of rollers, connection components, connecting rods and proximity switches in a grab bridge crane, the problem of heavy hammer involvement caused by wear of wire ropes and oil deficiency is solved, and safety and production efficiency are improved.
Patent Information
- Application Number
- CN202420724750.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-04-10
AI Technical Summary
During the use of grab cranes, wear and oil deficiency of the wire rope often leads to heavy hammers being involved in the wire rope, causing safety hazards and increasing maintenance costs and downtime.
A grab lifting limit device for grabbing bridge crane is designed, using a combination of rollers, connecting components, connecting rods and proximity switches. Through the coordination of the proximity switch and the rollers, the lifting height is limited and the heavy hammer is not wrapped into the wire rope.
It effectively prevents heavy hammers from being wrapped in the wire rope, eliminates safety hazards, reduces maintenance costs and downtime, and improves the safety and production efficiency of the production process.
Smart Images
Figure CN222574122U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of cranes, and in particular to a grab bucket lifting limit device for a grab bucket bridge crane. Background Art
[0002] Grab crane refers to a lifting machinery equipped with a grab bucket, which is widely used in ports, docks, station freight yards, mines, etc. to load various bulk cargoes, logs, minerals, coal, sand and gravel, earth and stone, etc.; Among the various protections for grab cranes, the lifting height limit protection usually adopts a weight limit, and the ordinary weight limit is responded by a weight block suspended on the wire rope.
[0003] In the long-term use of grab cranes, wire rope wear and oil shortage are common challenges. When a failure occurs, the heavy hammer may be driven into the wire rope, which will cause safety hazards in the grab operation. This phenomenon not only seriously affects the safety of the production process, but also increases maintenance costs and downtime. Therefore, how to find a substitute to replace the heavy hammer limit is an issue that needs to be considered in the maintenance of grab cranes. Utility Model Content
[0004] In order to solve the problem that the heavy hammer is easily drawn into the wire rope when a grab crane fails, the present application provides a grab bucket lifting limit device for a grab bridge crane.
[0005] The present application provides a grab bucket lifting limit device for a grab bucket bridge crane, which adopts the following technical solution:
[0006] A grab bucket lifting limit device for a grab bridge crane comprises a roller arranged on a platform trolley, wherein the roller is arranged transversely on the platform trolley and is characterized in that a connecting assembly for fixing is arranged at one end of the roller, a slot seat is arranged at the other end of the roller, the slot seat is connected to the platform trolley, a connecting rod is arranged at one end of the roller close to the slot seat, a travel groove is opened along its length direction, the connecting rod is slidably connected in the travel groove and extends to one side of the slot seat, a proximity switch for controlling the operation of the crane is arranged on one side of the slot seat, and a rebound component for restoring the initial position of the connecting rod is also arranged on the slot seat.
[0007] When a grab crane fails during long-term use, it may drive the weight into the wire rope, thereby causing safety hazards in the grab operation. This phenomenon not only seriously affects the safety of the production process, but also increases the maintenance cost and downtime. By adopting the above technical solution, the roller is installed on the platform trolley, the connecting assembly is installed at one end of the roller, the connecting rod is installed at the other end of the roller, the connecting rod cooperates with the travel groove of the slot seat, and the proximity switch is installed on one side of the slot seat. When the grab rises, the wire rope is wound around the drum of the grab in an orderly manner. As the width of the wire rope on the drum increases, the drooping wire rope will move toward the direction of the roller. When the lifting height reaches the set danger zone, the wire rope will touch the roller and drive it to move laterally. Since one end of the roller is fixed on the trolley platform and the other end is stuck in the travel groove of the slot seat, when the roller is affected When the wire rope is pulled, it will move outward along the travel groove. This movement will drive the connecting rod to move toward the travel groove. The metal at the top of the connecting rod was originally close to the proximity switch, triggering the proximity switch to be energized. When the connecting rod moves, the proximity switch cannot sense the presence of the metal, so it takes action, disconnects the control circuit, and stops the operation of the lifting motor. In this way, even if a fault occurs, the weight can be prevented from being drawn into the wire rope, thereby avoiding possible safety accidents. Through the settings of rollers, connecting components, connecting rods and proximity switches, and the combination of proximity switches and rollers, it can limit the lifting height and reduce the occurrence of the weight being drawn into the wire rope, thereby eliminating safety hazards and ensuring the safety of the production process. At the same time, it effectively reduces production interruptions caused by equipment failures, reduces maintenance costs and downtime, thereby improving the company's production efficiency and economic benefits.
[0008] Optionally, a pin is rotatably arranged inside the roller, the roller is sleeved on the outer wall of the pin, one end of the pin is connected to the connecting rod, and the other end of the pin is connected to the connecting assembly.
[0009] By adopting the above technical solution, the pin shaft is rotatably installed in the roller; through the setting of the pin shaft, the roller can rotate around the pin shaft, so that the entire device can adapt to the dynamic movement of the wire rope, which helps to reduce friction and wear during operation, reduce maintenance costs, and increase service life.
[0010] Optionally, the connecting assembly includes an adjusting nut and a fixing bolt, wherein the fixing bolt is vertically arranged on the platform trolley, the adjusting nut is threadedly connected to the fixing bolt, and one end of the pin shaft away from the connecting rod is connected to the adjusting nut.
[0011] By adopting the above technical solution, the connecting assembly includes an adjusting nut and a fixing bolt; by setting the adjusting nut and the fixing bolt, the height can be adjusted according to work needs, ensuring that the grab crane can operate safely and effectively at different working heights, adapt to different working environments and task requirements, and has good adaptability.
[0012] Optionally, the resilient member includes a return spring, which is arranged along the opening direction of the travel groove of the slot seat, one end of the return spring is connected to the slot seat, and the other end of the return spring is connected to the connecting rod.
[0013] By adopting the above technical solution, the rebound part includes a reset spring; when the lifting height reaches the set danger zone, the wire rope will touch the roller and drive it to move laterally, and when the roller is subjected to the tension of the wire rope, it will move outward along the travel groove, and this movement will drive the connecting rod to move toward the travel groove, and the reset spring will be stretched. In this process, the reset spring stores elastic potential energy, and the proximity switch cannot sense the presence of metal, so it takes action, disconnects the control circuit, and stops the operation of the lifting motor. When the tension of the wire rope disappears, such as the grab bucket descends or the crane stops running, the reset spring begins to release its stored elastic potential energy, and the restoring force of the spring will push the connecting rod back to its initial position; through the setting of the reset spring, the automatic reset function ensures that the grab crane can quickly return to normal after a fault or abnormal situation occurs, reducing the need for manual intervention and improving the safety of the equipment.
[0014] Optionally, spring hooks are provided at both ends of the return spring, one end of the spring hook is connected to the slot seat, and the other end of the spring hook is connected to the connecting rod.
[0015] By adopting the above technical solution, the spring hooks are integrally formed at both ends of the return spring; through the setting of the spring hooks, the connection is convenient and does not require additional fasteners or welding. It only needs to hang the spring hooks directly at the corresponding positions, which greatly simplifies the installation and disassembly process and facilitates later inspection and maintenance.
[0016] Optionally, a switch base for adjusting the height of the proximity switch is provided on one side of the slot seat, and the switch base is arranged on a side of the slot seat away from the roller.
[0017] By adopting the above technical solution, the proximity switch is installed on the switch base; through the setting of the switch base, fine adjustment or large adjustment can be easily performed to ensure that the proximity switch is always in the best position, thereby accurately detecting the position of the connecting rod and ensuring the normal operation of the limit device.
[0018] Optionally, the surfaces of the card slot seat, the switch base and the connecting rod are all provided with an anti-corrosion coating for preventing corrosion, and the anti-corrosion coating is sprayed on the surfaces of the card slot seat, the switch base and the connecting rod respectively.
[0019] By adopting the above technical solution, the anti-corrosion coating is sprayed on the surface of the card slot seat, the switch base and the connecting rod; through the setting of the anti-corrosion coating, the anti-corrosion coating can form a protective film, effectively isolating the metal surface from the external environment, thereby preventing the occurrence of corrosion, reducing the maintenance cost of the device, and extending the overall service life of the device.
[0020] Optionally, the roller is made of a ceramic material that reduces thermal conductivity and adhesion.
[0021] By adopting the above technical solution, the roller is made of ceramic material; through the selection of materials, the use of ceramic material can reduce heat transfer and prevent the influence of thermal expansion and thermal stress on the performance of the device or equipment. At the same time, the surface of the ceramic material is smooth, which can effectively reduce the sticking phenomenon and keep the device or equipment clean and efficient.
[0022] In summary, the present application includes at least one of the following beneficial technical effects:
[0023] Through the setting of rollers, connecting components, connecting rods and proximity switches, the combination of proximity switches and rollers can limit the lifting height and reduce the occurrence of the heavy hammer being drawn into the wire rope, thereby eliminating safety hazards and ensuring the safety of the production process. At the same time, it can effectively reduce production interruptions caused by equipment failures, reduce maintenance costs and downtime, thereby improving the production efficiency and economic benefits of the enterprise;
[0024] Through the setting of the reset spring, the automatic reset function ensures that the grab crane can quickly return to normal after a fault or abnormal situation occurs, reducing the need for manual intervention and improving the safety of the equipment;
[0025] Through the selection of materials, the use of ceramic materials can reduce heat transfer and prevent the impact of thermal expansion and thermal stress on the performance of the device or equipment. At the same time, the smooth surface of the ceramic material can effectively reduce the sticking phenomenon and keep the device or equipment clean and efficient. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a structural schematic diagram of a grab bucket lifting limit device of a grab bucket bridge crane in an embodiment of the present application.
[0027] Figure 2 It is a structural diagram used to reflect the connection components in the embodiment of the present application.
[0028] Figure 3 It is a structural schematic diagram used to reflect the card slot seat in the embodiment of the present application.
[0029] Figure 4 It is a partial enlarged view used to illustrate the resilient member in the embodiment of the present application.
[0030] Explanation of the reference numerals: 1. platform trolley; 2. roller; 21. pin shaft; 3. connecting assembly; 31. adjusting nut; 32. fixing bolt; 4. slot seat; 41. travel slot; 5. connecting rod; 6. proximity switch; 7. rebound part; 71. reset spring; 8. spring hook; 9. switch base; 10. anti-corrosion coating. DETAILED DESCRIPTION
[0031] The following is combined with Figure 1-4 This application is described in further detail.
[0032] The embodiment of the present application discloses a grab bucket lifting limit device for a grab bucket bridge crane. Figure 1 The grab bucket lifting limit device of the grab bridge crane includes a roller 2. In this embodiment, the roller 2 is horizontally installed on the platform trolley 1. The roller 2 is located below the drum in the grab bridge crane. The roller 2 is made of ceramic material, which can reduce heat transfer and prevent thermal expansion and thermal stress from affecting the performance of the device or equipment. At the same time, the surface of the ceramic material is smooth, which can effectively reduce the sticking phenomenon.
[0033] Reference Figure 1 and Figure 2 A pin shaft 21 is rotatably installed inside the roller 2, and the roller 2 is sleeved on the outer wall of the pin shaft 21. The roller 2 can rotate around the pin shaft 21, so that the entire device can adapt to the dynamic movement of the wire rope, which helps to reduce friction and wear during operation, reduce maintenance costs, and increase service life.
[0034] Reference Figure 1 and Figure 2 A connecting assembly 3 is installed at one end of the roller 2, and the connecting assembly 3 includes an adjusting nut 31 and a fixing bolt 32. The fixing bolt 32 is welded and fixed on the platform trolley 1, and the adjusting nut 31 is threadedly connected to the fixing bolt 32. One end of the pin shaft 21 is installed and fixed on the adjusting nut 31, and can be adjusted in height according to work needs, ensuring that the grab crane can operate safely and effectively at different working heights, adapt to different working environments and task requirements, and has good adaptability.
[0035] Reference Figure 2 and Figure 3 A connecting rod 5 is fixedly installed on one end of the pin shaft 21 away from the adjusting nut 31, a slot seat 4 is installed on the platform trolley 1, a travel slot 41 is opened on the slot seat 4, and the connecting rod 5 is slidably connected in the travel slot 41 and extends toward one side of the slot seat 4.
[0036] Reference Figure 2A proximity switch 6 is installed on the side of the slot seat 4 away from the roller 2. The installation position of the proximity switch 6 is opposite to the front end of the connecting rod 5. In this embodiment, the proximity switch 6 is selected as an inductive proximity switch, which has a fast response speed and low environmental requirements. The proximity switch 6 adopts an inductive proximity switch, and the electric shock is normally open. When the metal at the front end of the connecting rod 5 is sensed, the electric shock is closed and brought into the control circuit to connect the circuit. When the metal at the front end of the connecting rod 5 is not sensed, the electric shock is disconnected and the control circuit is disconnected.
[0037] Reference Figure 2 A switch base 9 is installed on the slot seat 4, and a proximity switch 6 is installed on the switch base 9. The proximity switch 6 can be easily fine-tuned or adjusted significantly to ensure that the proximity switch 6 is always in the best position, thereby accurately detecting the position of the connecting rod 5 and ensuring the normal operation of the limit device.
[0038] Reference Figure 2 and Figure 3 In this embodiment, the surfaces of the card slot seat 4, the switch base 9 and the connecting rod 5 are sprayed with an anti-corrosion coating. The anti-corrosion coating 10 can form a protective film to effectively isolate the metal surface from the external environment, thereby preventing the occurrence of corrosion, reducing the maintenance cost of the device, and extending the overall service life of the device.
[0039] Reference Figure 4 A rebound member 7 is installed on the slot seat 4. In this embodiment, the rebound member 7 is used to restore the initial position of the connecting rod 5. The rebound member 7 includes a reset spring 71. The reset spring 71 is installed along the opening direction of the stroke groove 41 of the slot seat 4. Both ends of the reset spring 71 are integrally formed with a spring hook 8. One end of the spring hook 8 is connected to the slot seat 4, and the other end of the spring hook 8 is connected to the connecting rod 5. The automatic reset function ensures that the grab crane can quickly return to a normal state after a fault or abnormal situation occurs, reducing the need for manual intervention and improving the safety of the equipment.
[0040] The implementation principle of the lifting limit device of a grab bucket bridge crane in the embodiment of the present application is as follows: when the grab bucket rises, the wire rope is wound around the drum of the grab bucket in an orderly manner. As the width of the wire rope on the drum increases, the drooping wire rope will move toward the direction of the roller 2. When the lifting height reaches the set danger range, the wire rope will touch the roller 2 and drive it to move laterally. Since one end of the roller 2 is fixed on the trolley platform and the other end is stuck in the stroke groove 41 of the slot seat 4, when the roller 2 is subjected to the tension of the wire rope, it will move outward along the stroke groove 41. This movement will drive the connecting rod 5 to move toward the stroke groove 41, resetting The spring 71 is stretched, and in this process the reset spring 71 stores elastic potential energy. The metal at the top of the connecting rod 5 is originally close to the proximity switch 6, which triggers the proximity switch 6 to be energized. When the connecting rod 5 moves, the proximity switch 6 cannot sense the existence of the metal, and thus acts, disconnects the control circuit, and stops the operation of the lifting motor. In this way, even if a fault occurs, the weight can be prevented from being drawn into the wire rope, thereby avoiding possible safety accidents. When the tension of the wire rope disappears, for example, the grab bucket descends or the crane stops running, the reset spring 71 begins to release its stored elastic potential energy, and the restoring force of the spring will push the connecting rod 5 back to its initial position.
[0041] Through the settings of the roller 2, the connecting assembly 3, the connecting rod 5 and the proximity switch 6, the combination of the proximity switch 6 and the roller 2 is used to limit the lifting height, and can also reduce the occurrence of the heavy hammer being drawn into the wire rope, thereby eliminating safety hazards and ensuring the safety of the production process. At the same time, it effectively reduces production interruptions caused by equipment failures, reduces maintenance costs and downtime, thereby improving the production efficiency and economic benefits of the enterprise. The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore: all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A grab bucket lifting limit device for a grab bucket bridge crane, comprising a roller (2) arranged on a platform trolley (1), wherein the roller (2) is arranged transversely on the platform trolley (1), and is characterized in that: A connecting assembly (3) for fixing is arranged at one end of the roller (2), and a slot seat (4) is arranged at the other end of the roller (2). The slot seat (4) is connected to the platform trolley (1). A connecting rod (5) is arranged at one end of the roller (2) close to the slot seat (4). The slot seat (4) is provided with a travel groove (41) along its length direction. The connecting rod (5) is slidably connected in the travel groove (41) and extends to one side of the slot seat (4). A proximity switch (6) for controlling the operation of the crane is arranged on one side of the slot seat (4). A rebound component (7) for restoring the initial position of the connecting rod (5) is also arranged on the slot seat (4).
2. The grab bucket lifting limit device of grab bucket bridge crane according to claim 1, characterized in that: A pin shaft (21) is rotatably arranged inside the roller (2), the roller (2) is sleeved on the outer wall of the pin shaft (21), one end of the pin shaft (21) is connected to the connecting rod (5), and the other end of the pin shaft (21) is connected to the connecting assembly (3).
3. The grab bucket lifting limit device of grab bucket bridge crane according to claim 2 is characterized in that: The connecting assembly (3) comprises an adjusting nut (31) and a fixing bolt (32), wherein the fixing bolt (32) is vertically arranged on the platform trolley (1), the adjusting nut (31) is threadedly connected to the fixing bolt (32), and one end of the pin shaft (21) away from the connecting rod (5) is connected to the adjusting nut (31).
4. The grab bucket lifting limit device of grab bucket bridge crane according to claim 1, characterized in that: The resilient member (7) comprises a return spring (71), the return spring (71) being arranged along the direction in which the travel groove (41) of the slot seat (4) is opened, one end of the return spring (71) being connected to the slot seat (4), and the other end of the return spring (71) being connected to the connecting rod (5).
5. The grab bucket lifting limit device of grab bucket bridge crane according to claim 4, characterized in that: Both ends of the return spring (71) are provided with spring hooks (8), one end of the spring hook (8) is connected to the slot seat (4), and the other end of the spring hook (8) is connected to the connecting rod (5).
6. The grab bucket lifting limit device of grab bucket bridge crane according to claim 1, characterized in that: A switch base (9) for adjusting the height of the proximity switch (6) is provided on one side of the slot seat (4); the switch base (9) is arranged on a side of the slot seat (4) away from the roller (2).
7. The grab bucket lifting limit device of grab bucket bridge crane according to claim 1, characterized in that: The surfaces of the card slot seat (4), the switch base (9) and the connecting rod (5) are all provided with an anti-corrosion coating (10) for preventing corrosion, and the anti-corrosion coating (10) is sprayed on the surfaces of the card slot seat (4), the switch base (9) and the connecting rod (5) respectively.
8. The grab bucket lifting limit device of grab bucket bridge crane according to claim 1, characterized in that: The support roller (2) is made of a ceramic material that reduces thermal conductivity and adhesion.