Crown block heavy punch limiting device
By installing a limit frame and a double hammer limiter on the overhead crane, and using a counterweight to drive the rotating rod to cut off the circuit, the safety hazards caused by the failure or ejection of the hammer limit device are solved, and the reliable and safe operation of the equipment is achieved.
Patent Information
- Application Number
- CN202520362015.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-03-04
AI Technical Summary
Existing counterweight limit devices are prone to equipment accidents due to malfunction of the rotation limit device or the counterweight being thrown out. They cannot reliably prevent the lifting equipment from being over-wound, posing a safety hazard.
The system employs a limiting frame and a double hammer limiter structure. The soft connection chain connecting the limiting frame to the main hook wire rope and the counterweight drive the rotating rod to cut off the circuit, ensuring reliable circuit switching and increasing safety.
Even if one of the counterweight limit switches fails, the other can still cut off the circuit to prevent the main hook from continuing to rise, thus improving the reliability of the equipment's safe operation, reducing malfunctions, and enhancing the equipment's safety.
Smart Images
Figure CN223722618U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of crown block control, in particular to a crown block heavy hammer position limiting device. BACKGROUND
[0002] The bridge crane (referred to as crown block) is widely used in the steel industry indoor and outdoor warehouse plant, and is an important tool for maintaining normal production operation, in order to ensure the safe operation of the crown block, the ascending position limiting device will be configured on the crown block, that is, when the lifting appliance rises to the limit position, the power supply can be automatically cut off to prevent the lifting hook or the lifting appliance from over winding the hoist and causing the steel wire rope to break and the lifting appliance to fall.
[0003] At present, the ascending position limiting device is generally divided into two types, namely the spiral type and the heavy hammer type, in the actual use process, the heavy hammer position limiting device often fails to play its due role after the rotary position limiting device fails, thereby causing equipment accidents. At the same time, most of the heavy hammer position limiting devices are slid on the ascending steel wire rope by a heavy hammer, and the main hook pushes the heavy hammer, and the position limiter acts to cut off the power supply of the crown block. However, in actual application, the heavy hammer is often thrown out of the lifting hook group, and the main hook cannot push the heavy hammer during the lifting process, thereby causing equipment damage. CONTENT OF THE UTILITY MODEL
[0004] The utility model embodiment provides a kind of crown block heavy hammer position limiting device, with safe and reliable technical effect.
[0005] A kind of crown block heavy hammer position limiting device, using the following technical solutions:
[0006] A kind of crown block heavy hammer position limiting device, including crown block main trolley platform and position limiting frame, position limiting frame is located below crown block main trolley platform, position limiting frame below is provided with crown block main hook, main hook steel wire rope is connected on crown block main hook, main hook steel wire rope passes through position limiting frame, installation hole is opened on main trolley platform, one end of position limiting frame is connected with first soft connection chain, the other end of position limiting frame is connected with second soft connection chain, main hook steel wire rope, first soft connection chain and second soft connection chain all pass through installation hole, first soft connection chain top is connected with the first heavy hammer position limiter that can control the on-off of crown block main hook ascending circuit, second soft connection chain top is connected with the second heavy hammer position limiter that can control the on-off of crown block main hook ascending circuit, first heavy hammer position limiter and second heavy hammer position limiter are all installed on crown block main trolley platform.
[0007] Preferably, the first heavy hammer position limiter includes a housing, a shaft and a rotating rod, both ends of the shaft are rotatably connected with the side wall of the housing, one end of the shaft extends out of the housing and is fixed with the rotating rod, one end of the rotating rod is fixed with a counterweight, the other end of the rotating rod is fixed with the top of the first soft connection chain, and the shaft in the housing is provided with a contact.
[0008] Preferably, a return spring is connected between the contact and the inner wall of the housing.
[0009] Preferably, four lifting rings are fixed on the limiting frame, two of which are fixed on one side of the limiting frame, and the other two are fixed on the other side of the limiting frame, the two lifting rings on the same side are both fixedly connected with first soft connection steel wires, and the ends of the two first soft connection steel wires away from the lifting rings converge upward to a position and are fixedly connected with a first soft connection chain.
[0010] Compared with the prior art, the utility model has the following technical effects:
[0011] If the main hook of the crown is in contact with the limiting frame upward and pushes the limiting frame to move upward, the first soft connection chain and the second soft connection chain lose the tension on the respective rotating rods, the rotating rods rotate under the action of the counterweight, one side of the counterweight rotates downward, so that the contact is disconnected, the power supply is cut off, and the main hook of the crown is prevented from continuing to move upward, even if one of the weight limiters fails, the other weight limiter can also cut off the circuit, and the safe operation of the equipment is ensured. The utility model changes the traditional weight into a limiting frame, which is not restricted by the main hook steel wire, reduces the possibility of misoperation, and increases the safety of the equipment. BRIEF DESCRIPTION OF DRAWINGS
[0012] The drawings described herein are used to provide further understanding of the utility model, constitute a part of the utility model, and do not constitute a limitation on the utility model. In the drawings:
[0013] Figure 1 To embody the overall structure schematic diagram of the utility model;
[0014] Figure 2 To embody the schematic diagram of the limiting frame in the utility model;
[0015] Figure 3 To embody the schematic diagram of the first weight limiter and the second weight limiter in the utility model;
[0016] Figure 4 To embody the schematic diagram of the internal structure of the shell in the utility model.
[0017] Mark for explaining the drawings: 1, main hook of the crown; 11, main hook steel wire; 2, main trolley platform; 21, mounting hole; 3, limiting frame; 31, lifting ring; 32, first soft connection steel wire; 33, first soft connection chain; 34, second soft connection steel wire; 35, second soft connection chain; 4, first weight limiter; 41, shell; 42, rotating shaft; 43, rotating rod; 44, counterweight; 45, contact; 46, return spring; 5, second weight limiter. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model will be further described in detail below in combination with embodiments and drawings. Here, the illustrative embodiments of the utility model and their descriptions are used to explain the utility model, but not as a limitation on the utility model.
[0019] Referring to Figures 1-4 A kind of crown heavy weight limiting device, including crown main hook 1 and main trolley platform 2, main hook wire rope 11 is connected to the top of crown main hook 1, installation hole 21 is opened in main trolley platform 2, and main hook wire rope 11 passes through installation hole 21. Limiting frame 3 is arranged below installation hole 21 of main trolley platform 2, and main hook wire rope 11 passes through limiting frame 3, and crown main hook 1 is located below limiting frame 3. First heavy weight limiter 4 and second heavy weight limiter 5 are fixed on main trolley platform 2. First heavy weight limiter 4 and second heavy weight limiter 5 are located at the two sides of installation hole 21 respectively.
[0020] Four lifting eyes 31 are fixed on limiting frame 3, two lifting eyes 31 are fixed on one side of limiting frame 3, and the other two lifting eyes 31 are fixed on the other side of limiting frame 3, first soft connection wire rope 32 is fixedly connected on the two lifting eyes 31 of the same side, and the ends of the two first soft connection wire ropes 32 away from lifting eye 31 converge to a place upwards and are fixedly connected with first soft connection chain 33. Second soft connection wire rope 34 is fixedly connected on the other two lifting eyes 31, and the ends of the two second soft connection wire ropes 34 away from lifting eye 31 converge to a place upwards and are fixedly connected with second soft connection chain 35. First soft connection chain 33 is connected with first heavy weight limiter 4, and second soft connection chain 35 is connected with second heavy weight limiter 5.
[0021] First heavy weight limiter 4 includes shell 41, and rotating shaft 42 is arranged in shell 41, the two ends of rotating shaft 42 are rotatably connected with the inner wall of shell 41, one end of rotating shaft 42 extends out of shell 41 and is fixed with rotating rod 43, rotating shaft 42 is located at the middle position of rotating rod 43, one end of rotating rod 43 is fixedly connected with first soft connection chain 33, and counterweight 44 is fixed on the other end of rotating rod 43. Contact 45 is fixed on the outer wall of rotating shaft 42 in shell 41, contact 45 controls the circuit on-off of the rising of crown main hook 1, and contact 45 is normally closed contact. When contact 45 is closed, it is initial state, and in initial state, one side of rotating rod 43 fixed with counterweight 44 is high, and the side of rotating rod 43 away from counterweight 44 is low. Second heavy weight limiter 5 is same in structure with first heavy weight limiter 4, and second soft connection chain 35 is fixedly connected with rotating shaft 42 of second heavy weight limiter 5.
[0022] The reset spring 46 is fixed between the contact 45 and the inner wall of the shell 41, after the circuit of the hoist main hook 1 is disconnected, when the hoist main hook 1 moves downwards, the limiting frame 3 moves downwards, the first soft connection chain 33 and the second soft connection chain 35 pull the rotating rod 43 downwards, and the contact 45 resets after the rotating rod 43 rotates.
[0023] The implementation principle of the hoist heavy hammer limiting device is as follows: when the hoist main hook 1 is below the limiting frame 3, the limiting frame 3 is pulled tight by the first soft connection chain 33 and the second soft connection chain 35 due to gravity, the end of the rotating rod 43 away from the counterweight block 44 inclines downwards, and the end of the rotating rod 43 towards the counterweight block 44 inclines upwards, so that the contact 45 is in a closed state.
[0024] The hoist main hook 1 is contacted with the limiting frame 3 upwards, the circuit of the hoist main hook 1 is disconnected, even if one of the heavy hammer limiters is faulty, the other heavy hammer limiter can also cut off the circuit, and the safe operation of the equipment is ensured.
[0025] The above only describes preferred embodiments of the utility model, and is not used for limiting the protection scope of the utility model. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model are included in the protection scope of the utility model.
Claims
1. A crane counterweight limiting device, characterized in that, The system includes a main trolley platform (2) and a limiting frame (3). The limiting frame (3) is located below the main trolley platform (2). A main hook (1) is installed below the limiting frame (3). A main hook wire rope (11) is connected to the main hook (1). The main hook wire rope (11) passes through the limiting frame (3). An installation hole (21) is provided on the main trolley platform (2). A first flexible connecting chain (33) is connected to one end of the limiting frame (3), and a second flexible connecting chain (35) is connected to the other end of the limiting frame (3). The main hook wire rope (11), the first soft connection chain (33) and the second soft connection chain (35) all pass through the mounting hole (21). The top of the first soft connection chain (33) is connected to a first counterweight limiter (4) that can control the on / off of the lifting circuit of the main hook (1) of the crane. The top of the second soft connection chain (35) is connected to a second counterweight limiter (5) that can control the on / off of the lifting circuit of the main hook (1) of the crane. The first counterweight limiter (4) and the second counterweight limiter (5) are both installed on the main trolley platform (2) of the crane.
2. The crane counterweight limiting device according to claim 1, characterized in that, The first counterweight limiter (4) includes a housing (41), a rotating shaft (42) and a rotating rod (43). Both ends of the rotating shaft (42) are rotatably connected to the side wall of the housing (41). One end of the rotating shaft (42) extends out of the housing (41) and is fixed to the rotating rod (43). One end of the rotating rod (43) is fixed with a counterweight (44), and the other end of the rotating rod (43) is fixed to the top of the first flexible connection chain (33). A contact point (45) is provided on the rotating shaft (42) inside the housing (41).
3. The crane counterweight limiting device according to claim 2, characterized in that, A return spring (46) is connected between the contact (45) and the inner wall of the housing (41).
4. The crane counterweight limiting device according to claim 1, characterized in that, Four lifting rings (31) are fixed on the limiting frame (3). Two of the lifting rings (31) are fixed on one side of the limiting frame (3), and the other two lifting rings (31) are fixed on the other side of the limiting frame (3). The two lifting rings (31) on the same side are fixedly connected with a first flexible connecting steel wire rope (32). The ends of the two first flexible connecting steel wire ropes (32) away from the lifting rings (31) converge upwards and are fixedly connected to the first flexible connecting chain (33). The other two lifting rings (31) are fixedly connected with a second flexible connecting steel wire rope (34). The ends of the two second flexible connecting steel wire ropes (34) away from the lifting rings (31) converge upwards and are fixedly connected to the second flexible connecting chain (35).