Ultrahigh limiting device for single-arm gantry crane
By designing the ultra-high limit device of the single-arm door machine, the chain and heavy hammer limit mechanism are used to detect the height of the spreader, the collision problem caused by the fast rise of the hook is solved, and safe and efficient spreader operation is achieved.
Patent Information
- Application Number
- CN202422272898.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-18
AI Technical Summary
When the single-arm door seat fixed crane is in use, the hook rises too fast, which may collide with the arm frame structure, resulting in safety accidents.
A single-arm door machine ultra-high limit device is designed, including a chain and a heavy hammer limit mechanism, which connects the arm frame and the limit box through a chain. The limit switch and a trigger rod are installed in the limit box. The trigger rod is pushed by the chain to contact the limit switch and issue a stop command to achieve the super-high limit of the spreader.
Effectively prevent the spreader from exceeding the safety height, avoid collision with the structure, ensure the safety of equipment and operators, reduce equipment damage and shutdown and maintenance, and improve production efficiency.
Smart Images
Figure CN223032905U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a limiting device, in particular to an ultra-high limiting device for a single-boom portal crane. Background Art
[0002] Among port machinery and equipment, the single-boom portal crane with a fixed portal is a large-scale lifting equipment, usually used in ports, shipyards or heavy industry fields for loading, unloading, handling heavy objects or assembling large structural parts. This crane can provide a lifting capacity of up to 2000 tons and is suitable for handling overweight, over-length and over-width goods. The fixed crane is generally installed on a fixed base and can move horizontally or vertically to meet different operation requirements.
[0003] When the single-boom portal crane with a fixed portal is in use, the hook realizes the lifting and lowering of the hook by winding and unwinding the steel wire rope with the hoisting mechanism. However, due to incorrect operations of the operator and other situations, the rising speed of the hook is often too fast, resulting in a collision between the hook and the boom structure, triggering a safety accident.
[0004] Therefore, there is an urgent need for an ultra-high limiting device for a single-boom portal crane to solve the problem that when the single-boom portal crane with a fixed portal is in use, the lifting appliances such as the hook on it may collide with the boom structure during the rising process, so as to ensure that the crane will not exceed the preset safety height limit during the operation process. Summary of the Utility Model
[0005] Aiming at the deficiencies in the prior art, the utility model provides an ultra-high limiting device for a single-boom portal crane to solve the problem that when the single-boom portal crane with a fixed portal is in use, the lifting appliances such as the hook on it may collide with the boom structure during the rising process.
[0006] To achieve the above object, the utility model adopts the following technical solutions:
[0007] An ultra-high limiting device for a single-boom portal crane, characterized in that: it includes a chain and a weight limiting mechanism. The weight limiting mechanism includes a limiting box, a limit switch and a trigger rod. The upper end of the limiting box is connected to the boom through a chain and hangs vertically above the lifting appliance. A limit switch is installed in the inner cavity of the limiting box. A sliding sleeve is installed at the bottom of the inner cavity of the limiting box. The trigger rod is slidably arranged in the sliding sleeve, and the lower end of the trigger rod passes through the sliding sleeve and passes through the bottom end of the limiting box. The upper end of the trigger rod can slide upward from the upper end of the sliding sleeve to contact the limit switch, and the limit switch is electrically connected to the control system.
[0008] To optimize the above technical solution, the specific measures taken also include:
[0009] Further, the upper end of the chain is hinged to the lifting lug on the boom through a second shackle, and the lower end of the chain is hinged to the small lifting lug on the limit box through a first shackle.
[0010] Further, a winding and unwinding drum and a driving motor are installed on the boom. The upper end of the chain is wound and limited on the winding and unwinding drum, and the driving motor is used to drive the winding and unwinding drum to rotate to wind and unwind the chain.
[0011] Further, a nut with an outer diameter larger than the inner diameter of the sliding sleeve is provided at the upper end of the trigger rod.
[0012] Further, several nuts are connected to the lower end of the trigger rod.
[0013] Further, a roller mechanism is further included. The roller mechanism includes rollers, roller brackets and roller shafts. Roller brackets are installed on the side walls of the limit box. Several parallel roller shafts are installed on the roller brackets. A roller is rotatably connected to each roller shaft respectively. The gap between adjacent rollers can be penetrated by a steel wire rope for connecting a lifting appliance.
[0014] Further, two parallel roller shafts are installed on the roller bracket, and a roller is rotatably connected to each roller shaft respectively.
[0015] Further, a striking block is further included. The striking block is installed on the lifting appliance and is located below the trigger rod of the heavy hammer limit mechanism for pushing the trigger rod to slide upward in the sliding sleeve.
[0016] Further, the striking block includes a trigger baffle and a mounting bracket. The trigger baffle is installed on the lifting appliance through the mounting bracket, and the trigger baffle is located below the trigger rod of the heavy hammer limit mechanism.
[0017] The beneficial effects of the present utility model are as follows:
[0018] By setting the chain and the heavy hammer limit mechanism, the heavy hammer limit mechanism for detecting the rising height of the lifting appliance is suspended above the lifting appliance. In this way, during use, the moving lifting appliance can preferentially contact the lower end of the trigger rod, thereby pushing the trigger rod to slide upward in the sliding sleeve until the upper end of the trigger rod contacts the limit switch. After the limit switch contacts the trigger rod, it sends a stop motion or other preset instructions to the electrically connected control system to achieve the ultra-high limit of the movement of the lifting appliance. At the same time, through the setting of the chain, the self-weight of the chain can be used to reduce the influence of factors such as wind force on the heavy hammer limit mechanism, reduce the shaking of the device, and thus reduce the triggering error and signal error caused by the shaking.
[0019] When in use, the utility model can adjust the use length of the chain as required by driving the winding drum, so as to adjust the use height of the weight limit mechanism and meet the limit requirements of different limit heights. At the same time, when in use, the chain can also be controlled to elongate through the winding drum until the weight limit mechanism drops to the specified height, which is convenient for the staff to carry out stable and safe maintenance operations, avoiding the risks and time-consuming and laborious nature of high-altitude operations.
[0020] When in use, when the lifting appliance of the crane approaches or reaches the designed highest point, this device will be automatically activated to cut off the hoisting power source, prevent the lifting appliance from rising continuously, thus avoiding collision with bridge structures, tracks, winding drums or jib components, reducing equipment damage and ensuring the safety of operators. The utility model provides an ultra-high limit device with high safety, easy maintenance, accurate detection and high stability. It will not cause inaccurate detection due to factors such as wind force, has high detection accuracy, is convenient for maintenance, does not require long-term shutdown for maintenance, and greatly improves production efficiency. Brief Description of the Drawings
[0021] Figure 1 It is a schematic installation structure diagram of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0022] Figure 2 It is a schematic diagram before the trigger of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0023] Figure 3 It is a schematic diagram after the trigger of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0024] Figure 4 It is a schematic chain installation diagram of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0025] Figure 5 It is a schematic structural diagram of a weight limit mechanism of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0026] Figure 6 It is a schematic structural diagram of a roller mechanism of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0027] Figure 7 It is a schematic structural diagram of a roller shaft of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0028] Figure 8 It is a side view of the structure of a bumper of an ultra-high limit device for a single-jib gantry crane proposed by the utility model;
[0029] Figure 9Structural schematic diagram of a striker of a single-jib gantry crane ultra-high limit device proposed by the present utility model.
[0030] Reference numerals: 1. First shackle, 2. Limit box, 3. Roller mechanism, 31. Roller, 32. Roller bracket, 33. Roller shaft, 4. Limit switch, 5. Sleeve, 6. Trigger rod, 7. Lifting lug, 8. Second shackle, 9. Chain, 10. Trigger baffle, 11. Mounting bracket. Detailed implementation manners
[0031] The present utility model will be described in detail below with reference to the accompanying drawings.
[0032] As shown in the Figure 1 and Figure 5 accompanying drawings, a single-jib gantry crane ultra-high limit device according to an embodiment of the present utility model includes a chain 9 and a weight limit mechanism. The weight limit mechanism includes a limit box 2, a limit switch 4 and a trigger rod 6. The upper end of the limit box 2 is connected to the boom through the chain 9 and hangs vertically above the spreader. A limit switch 4 is installed in the inner cavity of the limit box 2. A sleeve 5 is installed at the bottom of the inner cavity of the limit box 2. The trigger rod 6 is slidably arranged in the sleeve 5, and the lower end of the trigger rod 6 passes through the sleeve 5 and extends out of the bottom end of the limit box 2. The upper end of the trigger rod 6 can slide upward from the upper end of the sleeve 5 to contact the limit switch 4. The limit switch 4 is electrically connected to the control system.
[0033] Through the arrangement of the chain 9 and the weight limit mechanism in the present utility model, the weight limit mechanism for detecting the rising height of the spreader hangs vertically above the spreader. Thus, during use, the moving spreader can preferentially contact the lower end of the trigger rod 6, thereby pushing the trigger rod 6 to slide upward in the sleeve 5 until the upper end of the trigger rod 6 contacts the limit switch 4. After the limit switch 4 contacts the trigger rod 6, it sends a stop motion or other preset instructions to the electrically connected control system to achieve ultra-high limit for the movement of the spreader. At the same time, through the arrangement of the chain 9, the self-weight of the chain 9 can be used to reduce the influence of factors such as wind on the weight limit mechanism, reduce the shaking of the device, and thus reduce the triggering error and signal error caused by shaking.
[0034] As shown in the Figure 4 accompanying drawings, in another specific embodiment, the upper end of the chain 9 is hinged to the lifting lug 7 on the boom through the second shackle 8, and the lower end of the chain 9 is hinged to the small lifting lug on the limit box 2 through the first shackle 1. In this way, the stability and reliability of the connection and use of the chain 9 are ensured.
[0035] In another specific embodiment, a winding and unwinding drum and a driving motor are installed on the jib. The upper end of the chain 9 is wound and limited on the winding and unwinding drum, and the driving motor is used to drive the winding and unwinding drum to rotate to wind and unwind the chain 9. In this way, during use, the length of the chain 9 can be adjusted as needed by driving the winding and unwinding drum, so as to adjust the use height of the weight limiting mechanism, and thus meet the limiting requirements of different limiting heights. At the same time, during use, the chain 9 can also be controlled to extend by the winding and unwinding drum until the weight limiting mechanism descends to a specified height, so as to facilitate stable and safe maintenance operations for workers, avoiding the risks and time-consuming and laborious nature of working at heights.
[0036] In another specific embodiment, a nut with an outer diameter larger than the inner diameter of the sliding sleeve 5 is provided at the upper end of the trigger rod 6. In this way, it can be ensured that the trigger rod 6 will not slip out of the sliding sleeve 5 from below, ensuring the stability and reliability of the device during use.
[0037] In another specific embodiment, several nuts are connected to the lower end of the trigger rod 6. In this way, during use, the self-weight of the device as a whole can be increased by adding nuts, thereby further avoiding the influence of factors such as wind on the device; at the same time, the contact area with structures such as the lower sling can be increased by the nuts, so as to ensure that the trigger rod 6 can be stably pushed upward to contact the limit switch 4 after contacting the sling.
[0038] As shown in the attached Figure 6 and attached Figure 7 As shown, in another specific embodiment, a roller mechanism is further included. The roller mechanism includes rollers 31, roller brackets 32 and roller shafts 33. The side wall of the limit box 2 is provided with roller brackets 32, and several parallel roller shafts 33 are installed on the roller brackets 32. A roller 31 is rotatably connected to each roller shaft 33 respectively. The gap between adjacent rollers 31 can be passed through by the hoisting wire rope for connecting the sling. In this way, during use, the limit box 2 can be limited to the adjacent hoisting wire rope through the roller mechanism, thereby further avoiding the influence brought by the displacement of the weight limiting mechanism; at the same time, in this embodiment, corresponding rollers 31 and roller shafts 33 can be added as needed, and the limit connection can be carried out with different hoisting wire ropes at the same time, thereby avoiding the influence brought by the rotation of the weight limiting mechanism.
[0039] Among them, two parallel roller shafts 33 are installed on the roller bracket 32, and a roller 31 is rotatably connected to each roller shaft 33 respectively. In this way, while streamlining the structure, the use effect of the device is ensured.
[0040] As shown in the attached Figure 8 and attached Figure 9As shown, in another specific embodiment, it further includes a collision block, which is installed on the spreader and located below the trigger rod 6 of the weight limit mechanism, and is used to push the trigger rod 6 to slide upward in the sliding sleeve 5. In this way, during use, the risk of triggering caused by the special-shaped structure on the spreader can be reduced through the setting of the collision block, and the collision block can stably cooperate with and trigger the movement of the trigger rod 6.
[0041] Specifically, the collision block includes a trigger baffle 10 and a mounting bracket 11. The trigger baffle 10 is installed on the spreader through the mounting bracket 11, and the trigger baffle 10 is located below the trigger rod 6 of the weight limit mechanism. In this way, during use, the trigger baffle 10 can be used to abut against and push the trigger rod 6 to slide upward in the sliding sleeve 5 until it contacts the limit switch 4.
[0042] As shown in the appendix Figure 2 and the appendix Figure 3 As shown, when the utility model device is in use, the lifting lug 7 is welded to the head pulley bracket of the boom, the small lifting lug is installed on the limit box 2, and both ends of the chain 9 are connected to the lifting lug 7 and the small lifting lug through shackles. The limit switch 4 is connected to the limit box 2 by bolts, the roller bracket 32 of the roller mechanism 3 is connected to the limit box 2 in a welded form, and the roller 31 is connected to the roller bracket 32 through the roller shaft 33. The collision block is made by welding steel plates, and the trigger baffle 10 of the collision block is directly welded to the spreader through the mounting bracket 11.
[0043] When the hoisting wire rope of the crane passes through the gap of the roller 31 of the roller mechanism 3, the roller 31 structure does not affect the normal use of the hoisting wire rope, and at the same time, the weight limit mechanism can always be suspended above the spreader; when the spreader moves upward, the collision block on the spreader first contacts the lower end of the trigger rod 6 below the weight limit mechanism, and the spreader pushes the trigger rod 6 to move upward. As a result, the upper end of the trigger rod 6 will move to contact the limit switch 4, the limit switch 4 is triggered and receives a signal, and the limit switch 4 will transmit this signal to the corresponding PLC control system. At this time, the PLC control system will control and limit the spreader from continuing to move upward; it can be set as required to allow the spreader to move downward. When the spreader moves downward until the trigger rod 6 no longer contacts the limit switch 4, the limit switch 4 transmits a new signal to the PLC control system correspondingly, waiting for the next trigger.
[0044] When the spreader of the crane approaches or reaches the designed highest point during the use of the utility model, this device will be automatically started to cut off the hoisting power source to prevent the spreader from continuing to rise, thereby avoiding collision with bridge structures, tracks, drums or boom components, reducing equipment damage, and ensuring the safety of operators. The utility model provides an ultra-high limit device with high safety, easy maintenance, accurate detection and high stability. It will not be affected by factors such as wind force and cause inaccurate detection. The detection accuracy is high, the maintenance is convenient, and there is no need to stop the machine for a long time for maintenance, which greatly improves the production efficiency.
[0045] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "rear" cited in the utility model are only for the convenience of clear description, rather than for limiting the scope of implementation of the utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the utility model.
[0046] The above is only the preferred implementation mode of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions within the idea of the utility model belong to the protection scope of the utility model. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the utility model should be regarded as the protection scope of the utility model.
Claims
1. An ultra-high limit device for a single-arm gantry crane, characterized in that: The invention comprises a chain (9) and a weight limit mechanism, wherein the weight limit mechanism comprises a limit box (2), a limit switch (4) and a trigger rod (6); the upper end of the limit box (2) is connected to the arm frame through the chain (9) and is suspended above the sling; the limit switch (4) is installed in the inner cavity of the limit box (2); a sliding sleeve (5) is installed at the bottom of the inner cavity of the limit box (2); the trigger rod (6) is slidably arranged in the sliding sleeve (5); the lower end of the trigger rod (6) passes through the sliding sleeve (5) and passes out of the bottom end of the limit box (2); the upper end of the trigger rod (6) can slide upward from the upper end of the sliding sleeve (5) to connect with the limit switch (4); and the limit switch (4) is electrically connected to the control system.
2. The super-height limiting device for a single-arm gantry crane according to claim 1 is characterized in that: The upper end of the chain (9) is hinged to the lifting lug (7) on the boom via a second shackle (8), and the lower end of the chain (9) is hinged to the small lifting lug on the limit box (2) via a first shackle (1).
3. The super-height limiting device for a single-arm gantry crane according to claim 1 is characterized in that: A retractable drum and a drive motor are mounted on the arm, the upper end of the chain (9) is wound around and limited on the retractable drum, and the drive motor is used to drive the retractable drum to rotate to retract and extend the chain (9).
4. The super-height limiting device for a single-arm gantry crane according to claim 1 is characterized in that: The upper end of the trigger rod (6) is provided with a nut having an outer diameter greater than the inner diameter of the sliding sleeve (5).
5. The super-height limiting device for a single-arm gantry crane according to claim 1 is characterized in that: The lower end of the trigger rod (6) is connected to a plurality of nuts.
6. The super-height limiting device for a single-arm gantry crane according to claim 1 is characterized in that: It also includes a roller mechanism, the roller mechanism including a roller (31), a roller bracket (32) and a roller shaft (33), the side wall of the limit box (2) is installed with a roller bracket (32), a plurality of parallel roller shafts (33) are installed on the roller bracket (32), each of the roller shafts (33) is rotatably connected to a roller (31), and the gaps between adjacent rollers (31) can be used for passing a steel wire rope for connecting a sling.
7. The super-height limiting device for a single-arm gantry crane according to claim 6 is characterized in that: Two parallel roller shafts (33) are mounted on the roller bracket (32), and each of the roller shafts (33) is rotatably connected to a roller (31).
8. The super-height limiting device for a single-arm gantry crane according to claim 1 is characterized in that: It also includes a collision block, which is mounted on the sling and located below the trigger rod (6) of the heavy hammer limiting mechanism and is used to push the trigger rod (6) to slide upward in the sliding sleeve (5).
9. The super-height limiting device for a single-arm gantry crane according to claim 8, characterized in that: The impact block comprises a trigger baffle (10) and a mounting frame (11); the trigger baffle (10) is mounted on the sling via the mounting frame (11); and the trigger baffle (10) is located below the trigger rod (6) of the weight limit mechanism.