Intelligent pressure relief lifting control device for steel coil transport trolley

Abstract

The utility model discloses a kind of intelligent pressure relief lifting control devices for steel coil transport trolley, belong to hydraulic high-low pressure control technical field, a kind of intelligent pressure relief lifting control devices for steel coil transport trolley, including transport trolley, the center of the chassis of transport trolley is provided with object carrying disc, fixed mounting is positioned on object carrying disc, the top of transport trolley is fixedly installed with hydraulic pump machine, the output position of hydraulic pump machine is provided with four output shaft poles, the top of four output shaft poles is commonly installed with steel coil bearing plate, and the contact position of output shaft pole and steel coil bearing plate is fixedly provided with pressure sensor. It can avoid to exert too big jacking force to winding mandrel, effectively prevent the plastic deformation and damage of mandrel, prolong its service life, reduce equipment maintenance cost and downtime, at the same time, greatly reduce the possibility that heavy steel coil slips even overturns in lifting process, guarantee the safety of personnel and equipment.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic high and low pressure control technology, and more specifically, to an intelligent pressure relief lifting control device for a steel coil transport trolley. Background Technology

[0002] Rolling is one of the core processes in metal plastic processing. It refers to the process of applying pressure to a metal billet using rotating rolls, causing it to undergo plastic deformation in the gap between the rolls, thereby obtaining products such as plates, strips, profiles, and pipes with the required shape, size, and properties.

[0003] Currently, after the rolling mill finishes rolling and unloads the product, there are often operations such as unloading the core. Usually, these operations are completed by the unloading trolley through lifting and lowering, and moving it in and out. Since the core is relatively light, without high and low pressure control, the pressure on the core shaft will be too great, causing the core shaft to deform and be damaged.

[0004] Therefore, in view of this, the existing structure is studied and improved to provide an intelligent pressure relief lifting control device for steel coil transport trolley, in order to achieve a more practical purpose. Utility Model Content

[0005] 1. Technical problems to be solved In view of the problems existing in the prior art, the purpose of this utility model is to provide an intelligent pressure relief lifting control device for steel coil transport trolley. It can avoid applying excessive lifting force to the coiling mandrel, effectively prevent plastic deformation and damage of the mandrel, extend its service life, reduce equipment maintenance costs and downtime, and at the same time, greatly reduce the possibility of heavy steel coils sliding or even overturning during the lifting process, thus ensuring the safety of personnel and equipment.

[0006] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution.

[0007] An intelligent pressure relief and lifting control device for a steel coil transport trolley includes a transport trolley. A loading disc is located at the center of the chassis of the transport trolley and is fixed by four bolts. A locator is fixedly installed on the loading disc. A hydraulic pump is fixedly installed at the top of the transport trolley. Four output shafts are located at the output position of the hydraulic pump. A steel coil bearing plate is mounted on the top of the four output shafts. A pressure sensor is fixedly installed at the contact position between the output shafts and the steel coil bearing plate. Several positioning holes are opened at the top of the steel coil bearing plate. A U-shaped steel pile is installed between two adjacent positioning holes. The middle of the U-shaped steel pile is locked by a locking nut. The positioner, hydraulic pump, and pressure sensor transmit signals to a remote location via a control terminal built into the transport trolley, and are connected to a logic controller (PLC).

[0008] Furthermore, the locator is a laser rangefinder or an ultrasonic sensor, which is installed at the center of the loading disk to detect the current height of the steel coil support plate in real time and feed the height signal back to the logic controller PLC.

[0009] Furthermore, the hydraulic pump is a servo hydraulic pump with a built-in displacement encoder for precisely controlling the synchronous lifting stroke of the four output shafts.

[0010] Furthermore, the four pressure sensors are arranged in a rectangular array, and the logic controller PLC is configured to: monitor the readings of the four pressure sensors in real time and calculate their pressure difference; when any pressure difference exceeds a preset threshold, control the hydraulic pump to adjust the lifting speed of the corresponding output shaft to maintain the horizontal position of the steel coil support plate.

[0011] Furthermore, the inner wall of the U-shaped steel pile is covered with a layer of wear-resistant rubber padding; The locking nut is a lock nut.

[0012] Furthermore, the control terminal built into the transport vehicle also includes an audible and visual alarm; The logic controller PLC is configured to stop the hydraulic pump and trigger an audible and visual alarm when the total pressure value detected by the pressure sensor exceeds the safety factor of the rated weight of the steel coil.

[0013] Furthermore, the logic controller PLC has a preset lifting speed curve; The logic controller PLC is configured to, upon receiving a descent command, control the hydraulic pump to descend according to a speed curve that is fast at first and then slow, until the steel coil bearing plate smoothly contacts the load disc.

[0014] 3. Beneficial Effects Compared with existing technologies, the advantages of this utility model are: ① This solution uses a logic controller (PLC) to control the pressure regulation of the entire transport trolley during the steel coil transport process. When operating light loads such as coil cores, the system pressure is automatically limited, which fundamentally avoids applying excessive lifting force to the precision and expensive coiling mandrel, effectively preventing plastic deformation and damage to the mandrel, extending its service life, and reducing equipment maintenance costs and downtime. ② This solution, through real-time differential comparison of four pressure sensors and active leveling function, enables the system to dynamically sense and correct risks caused by uneven load or platform tilt, greatly reducing the possibility of heavy steel coils sliding or even overturning during lifting and ensuring the safety of personnel and equipment. Attached Figure Description

[0015] Figure 1 This is a three-dimensional top view of the overall device in this utility model; Figure 2 This is a three-dimensional diagram of the bottom structure of the overall device in this utility model; Figure 3 This is a plan view of the overall device in this utility model; Figure 4 This is a schematic diagram of the overall device after explosive disassembly in this utility model; Figure 5 This is a schematic diagram of the structure of the loading disc and the positioner in this utility model.

[0016] Explanation of the labels in the diagram: 1. Transport trolley; 2. Loading disk; 201. Bolt; 3. Positioner; 4. Hydraulic pump; 401. Output shaft; 5. Steel coil bearing plate; 6. Pressure sensor; 7. Positioning holes; 8. U-shaped steel pile; 801. Locking nut. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] Example: Please see Figure 1 - Figure 5An intelligent pressure relief and lifting control device for a steel coil transport trolley includes a transport trolley 1. A loading disc 2 is located at the center of the chassis of the transport trolley 1. The loading disc 2 is fixed by four bolts 201. A locator 3 is fixedly installed on the loading disc 2. A hydraulic pump 4 is fixedly installed at the top of the transport trolley 1. Four output shafts 401 are located at the output position of the hydraulic pump 4. A steel coil bearing plate 5 is installed at the top of the four output shafts 401. A pressure sensor 6 is fixedly installed at the contact position between the output shafts 401 and the steel coil bearing plate 5. Several positioning holes 7 are opened at the top of the steel coil bearing plate 5. A U-shaped steel pile 8 is installed between two adjacent positioning holes 7. The middle part of the U-shaped steel pile 8 is locked by a locking nut 801. The U-shaped steel pile 8 can play an auxiliary role in fixing the steel coil.

[0019] Positioner 3, hydraulic pump 4, and pressure sensor 6 transmit signals to a remote location via the control terminal built into the transport trolley 1, and are connected to a logic controller PLC.

[0020] The PLC is configured to control the working pressure of the hydraulic pump 4 to be limited to a preset lower pressure range when it receives a signal indicating that the trolley is in the unloading position and does not receive an activation signal.

[0021] Then, the operating data is collected in real time by the positioner 3 and the pressure sensor 6, and centrally processed and analyzed by the logic controller PLC, realizing automatic and intelligent control of the lifting process, which greatly reduces the reliance on the operator's experience.

[0022] See Figure 4 , Figure 5 Specifically, the locator 3 is a laser rangefinder or an ultrasonic sensor, which is installed at the center of the loading disk 2 to detect the current height of the steel coil bearing plate 5 in real time and feed the height signal back to the logic controller PLC.

[0023] Laser or ultrasonic sensors can non-contactly and with high precision measure the real-time height of the steel coil support plate 5, providing accurate position feedback to the control system. This makes the final control decision more efficient and accurate.

[0024] Specifically, the hydraulic pump 4 is a servo hydraulic pump with a built-in displacement encoder for precisely controlling the synchronous lifting stroke of the four output shafts 401.

[0025] The servo hydraulic system features fast response and high control precision. The built-in displacement encoder accurately reflects the actual stroke of each output shaft 401, which is the core component for achieving synchronous lifting of the four jacking points, effectively preventing jamming, structural deformation, or steel coil tilting caused by asynchrony.

[0026] Specifically, the four pressure sensors 6 are arranged in a rectangular array, and the logic controller PLC is configured to monitor the readings of the four pressure sensors 6 in real time and calculate their pressure difference. When any pressure difference exceeds the preset threshold, the hydraulic pump 4 is controlled to adjust the lifting speed of the corresponding output shaft 401 to maintain the horizontal position of the steel coil bearing plate 5.

[0027] By monitoring the pressure difference at the four corners, the PLC can detect in real time the shift of the steel coil's center of gravity or the non-level state of the support plate, and immediately compensate and correct it by adjusting the speed of each hydraulic rod. This is the core safety function to prevent the steel coil from sliding or even overturning due to instability during lifting and lowering.

[0028] Furthermore, maintaining a horizontal position means that the load is evenly distributed, avoiding damage to the trolley structure, hydraulic system, and steel coil itself caused by localized overload.

[0029] See Figure 3 , Figure 4 , Figure 5 Specifically, the inner wall of the U-shaped steel pile 8 is covered with a layer of wear-resistant rubber padding; Lock nut 801 is a lock nut to prevent loosening.

[0030] Rubber pads prevent hard steel piles from directly scratching or bumping the surface of the steel coil, providing cushioning and protection and ensuring the quality of transported goods.

[0031] Meanwhile, the anti-loosening nut can effectively resist loosening caused by vibration, ensuring that the U-shaped steel pile 8 is firmly fixed to the steel coil during transportation, which greatly improves the safety and stability during transportation.

[0032] Specifically, the control terminal built into the transport vehicle 1 also includes an audible and visual alarm; The logic controller PLC is configured to control the hydraulic pump 4 to stop working and trigger the audible and visual alarm when the total pressure value monitored by the pressure sensor 6 exceeds the safety factor of the rated weight of the steel coil.

[0033] To prevent damage to the hydraulic system and trolley structure due to overload operation, and to extend the service life of the equipment.

[0034] By using sound and light to warn operators of potential safety risks, and prompting them to intervene and take appropriate action, operators are prevented from continuing to operate in a potentially dangerous state.

[0035] Specifically, the logic controller PLC has a preset lifting speed curve; The logic controller PLC is configured to, upon receiving a descent command, control the hydraulic pump 4 to descend according to a speed curve that is fast at first and then slow, until the steel coil bearing plate 5 smoothly contacts the load disc 2.

[0036] "Fast at the beginning" allows for a rapid descent, improving work efficiency; "slow at the end" slows down as you approach the finish line, achieving a gentle and smooth landing, greatly reducing impact and vibration.

[0037] A smooth landing avoids internal damage or surface scratches to the steel coil caused by violent impact, and also reduces the impact load on mechanical components such as the load-bearing disc 2 and the hydraulic system.

[0038] The preset speed curve reflects the intelligence and precision of the control, going beyond simple "start and stop" control, making the whole process smoother and more reliable.

[0039] Working principle: When the transport trolley 1 reaches the unloading station of the rolling mill, the preset power switch or position sensor at the station will detect the trolley's arrival and send a "trolley at unloading station" signal to the PLC. Upon receiving this signal, the PLC automatically activates the "intelligent pressure relief mode." In this mode, the system's preset maximum working pressure will be limited to a lower, safer range. The purpose is to avoid excessive pressure on the lighter winding mandrel during subsequent lifting actions, preventing its deformation and damage.

[0040] During the process of hydraulic pump 4 starting and driving the four output shafts 401 to lift the steel coil support plate 5, pressure sensors 6 installed at the top of each shaft monitor the pressure value of their respective loads in real time. The PLC continuously reads the data from the four pressure sensors 6 and calculates the pressure difference between them. Once a difference is found to exceed a preset threshold, indicating that the steel coil support plate 5 is tilted or unevenly loaded, the PLC will immediately instruct hydraulic pump 4 to adjust the lifting speed of the corresponding output shaft 401 for dynamic compensation, ensuring that the support plate always remains horizontal and effectively preventing the steel coil from sliding or overturning.

[0041] Meanwhile, the positioner 3 installed at the center of the chassis loading disc 2 continuously measures the real-time height of the steel coil support plate 5 and feeds the data back to the PLC. Combined with the displacement encoder signal built into the hydraulic pump 4, the PLC ensures that the lifting strokes of the four output shafts 401 are precisely synchronized.

[0042] The position and pressure signals are transmitted to the PLC. When the trolley is in the unwinding position, the upward pressure is controlled to be maintained in a low range in order to reduce the pressure on the winding mandrel during the upward movement.

[0043] Throughout the process, the PLC accumulates the readings from the four pressure sensors 6 to calculate the total weight of the steel coil. Once the total pressure value exceeds the safety factor set according to the rated weight of the steel coil, the PLC immediately issues a command to stop the operation of the hydraulic pump 4 and trigger the audible and visual alarm on the transport trolley 1. This function promptly warns operators of the risk of overload, preventing equipment damage due to overload and ensuring operational safety.

[0044] When descent is required, the PLC executes a preset "fast then slow" optimized speed curve. In the initial stage of descent, the support plate descends rapidly to improve efficiency; as it approaches the bottom loading disc 2, the system automatically switches to a low-speed, gradual descent mode. This control method ensures a gentle and stable landing of the steel coil support plate 5, greatly reducing the impact and vibration on the steel coil itself and the trolley's mechanical structure.

[0045] When operations requiring higher pressure, such as lifting heavy steel coils, are needed, the operator can press the dedicated high-pressure button on the control box. This button sends an activation signal to the PLC, which then releases the pressure limit, restoring the hydraulic system's high-pressure operating capability. This ensures the device does not lose its original heavy-duty operation function, balancing protection and functionality.

[0046] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. An intelligent pressure relief lifting control device for a steel coil transport trolley, comprising a transport trolley (1), characterized in that: The chassis of the transport trolley (1) is provided with a loading disc (2) at its center. The loading disc (2) is fixed by four bolts (201). A locator (3) is fixedly installed on the loading disc (2). A hydraulic pump (4) is fixedly installed at the top of the transport trolley (1). Four output shafts (401) are provided at the output position of the hydraulic pump (4). A steel coil bearing plate (5) is installed at the top of the four output shafts (401). A pressure sensor (6) is fixedly installed at the contact position between the output shafts (401) and the steel coil bearing plate (5). Several positioning holes (7) are opened at the top of the steel coil bearing plate (5). A U-shaped steel pile (8) is installed between two adjacent positioning holes (7). The middle part of the U-shaped steel pile (8) is locked by a locking nut (801). The positioner (3), hydraulic pump (4), and pressure sensor (6) transmit signals to the remote control via the built-in control terminal of the transport trolley (1) and are connected to a logic controller PLC.

2. The intelligent pressure relief lifting control device for a steel coil transport trolley according to claim 1, characterized in that: The locator (3) is a laser rangefinder or an ultrasonic sensor, which is installed at the center of the loading disk (2) to detect the current height of the steel coil bearing plate (5) in real time and feed the height signal back to the logic controller PLC.

3. The intelligent pressure relief lifting control device for a steel coil transport trolley according to claim 1, characterized in that: The hydraulic pump (4) is a servo hydraulic pump with a built-in displacement encoder for precisely controlling the synchronous lifting stroke of the four output shafts (401).

4. The intelligent pressure relief lifting control device for a steel coil transport trolley according to claim 1, characterized in that: The four pressure sensors (6) are arranged in a rectangular array, and the logic controller PLC is configured to monitor the readings of the four pressure sensors (6) in real time and calculate their pressure difference. When any pressure difference exceeds the preset threshold, the hydraulic pump (4) is controlled to adjust the lifting speed of the corresponding output shaft (401) to keep the steel coil bearing plate (5) horizontal.

5. The intelligent pressure relief lifting control device for a steel coil transport trolley according to claim 1, characterized in that: The inner wall of the U-shaped steel pile (8) is covered with a layer of wear-resistant rubber pad. The locking nut (801) is an anti-loosening nut.

6. The intelligent pressure relief lifting control device for a steel coil transport trolley according to claim 1, characterized in that: The control terminal built into the transport vehicle (1) also includes an audible and visual alarm. The logic controller PLC is configured to control the hydraulic pump (4) to stop working and trigger the audible and visual alarm when the total pressure value monitored by the pressure sensor (6) exceeds the safety factor of the rated weight of the steel coil.

7. The intelligent pressure relief lifting control device for a steel coil transport trolley according to claim 1, characterized in that: The logic controller PLC has a preset lifting speed curve; The logic controller PLC is configured to: upon receiving a descent command, control the hydraulic pump (4) to depressurize and descend according to a speed curve that is fast at first and then slow, until the steel coil bearing plate (5) smoothly contacts the load disc (2).

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