Device and method for safely interlocking roller way and crown block

Abstract

The invention relates to a device and a method for safely interlocking a roller way and a crown block. The device comprises a coding cable address detector, a redundancy cold detection positioning sensor, a crown block weighing device, a height encoder, a crown block PLC system, a roller way PLC system, an on-vehicle wireless WIFI, a ground wireless WIFI and a roller way transmission system. The coded cable address detector and the redundant cold detection positioning sensor are combined with logic calculation to form a parking chain of the roller way, and the crown block weighing device and the height encoder are combined with logic calculation to form a roller way chain release command, so that the safety chain between the casting blank conveying roller way and the casting blank hoisting crown block is realized. And meanwhile, the conveying efficiency of the roller way is greatly improved.

Description

Technical Field

[0001] This patent application belongs to the technical field of steel production equipment, and more specifically, relates to a device and method for safety interlocking of a roller table and a crane. Background Art

[0002] In the metallurgical industry today, the continuous casting and hot rolling conveyor rollers have long been connected to realize the hot delivery function. The hardware and software such as overhead crane positioning, slab tracking, and slab management have also been well built, and a good foundation for improving production efficiency has been laid. In the production rhythm with increasing production efficiency and hot delivery efficiency indicators, the manual operation of slabs off the line greatly restricts the production rhythm. In actual use, the operator manually stops the conveyor roller, and the frequent operation wastes a lot of time. In addition to the low production efficiency, these operations also have serious safety hazards. There have been many cases where the rollers rotated when the billets were hoisted, damaging the overhead crane drum and wire rope and other equipment. This has caused great trouble to high-efficiency production, and a solution is urgently needed to solve this problem. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device and method for the safe interlocking of a roller table and an overhead crane, which has the characteristics of wide application, safety and accuracy, and can solve the efficiency constraints and safety hazards caused by manual operation of the overhead crane.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is:

[0005] A device for safety interlocking of a roller table and an overhead crane, comprising a roller table system and an overhead crane system, wherein the roller table system comprises a ground roller table PLC system, a redundant cold detection positioning sensor, a ground wireless WIFI, and a roller table transmission system, wherein the redundant cold detection positioning sensor, the ground wireless WIFI, and the roller table transmission system are all connected to the ground roller table PLC system;

[0006] The crane system includes the crane PLC system, coding cable address detector, crane weighing device, height encoder, and onboard wireless WIFI. The coding cable address detector, crane weighing device, height encoder, and onboard wireless WIFI are all connected to the crane PLC system.

[0007] The coding cable address detector is installed on one side of the crane, connected to the coding cable under the crane, used for continuous positioning of the crane, and can detect the continuous position of the crane;

[0008] Redundant cold detection positioning sensors are installed on the overhead travelling platform, which are used to directly detect the position signal of the overhead travelling platform switch (that is, to detect whether the overhead travelling platform is in place). There are two of them.

[0009] The crane weighing device is installed below the wire rope drum at the crane hook, and is used to measure the weight of the slab carried by the crane clamp;

[0010] The height encoder is coaxially mounted to the rear of the wire rope drum drive motor and is used to calculate the height of the overhead crane clamp;

[0011] The overhead crane PLC system is used to collect signals from sensors on the overhead crane and process and calculate the above signals;

[0012] The ground roller table PLC system is used to collect ground sensor signals;

[0013] The on-board wireless WIFI is connected to the ground wireless WIFI for signal interaction between the ground roller track PLC system and the overhead crane PLC system;

[0014] The roller drive system is used to directly control the operation of the roller table.

[0015] Furthermore, the redundant cold detection positioning sensors are cold metal detectors, which are respectively arranged on the left and right sides of the ground roller conveyor.

[0016] Furthermore, the overhead crane weighing device is an overhead crane weighing instrument, and the height encoder is a drum encoder.

[0017] A method for safely interlocking a roller table with an overhead crane, using the above device, comprises the following steps:

[0018] Step S1: Arrange the device and make preparations in place, and name the two redundant cold detection positioning sensors No. 1 cold metal detector and No. 2 cold metal detector respectively;

[0019] Step S2: The coding cable address detector and the redundant cold inspection positioning sensor detect in real time, and the on-board wireless WIFI and the ground wireless WIFI interact in real time. When the coding cable address detector detects that the overhead crane is directly above the roller, and the No. 1 cold metal detector has a signal, and the No. 2 cold metal detector has a signal (the two cold metal detectors are not only redundantly arranged, but also arranged on the left and right sides of the roller, which can accurately detect that the overhead crane is above the ground roller), and the ground roller is in automatic mode, the ground roller PLC system controls the roller transmission system, and the roller transmission system controls the ground roller to stop, and the interlocking takes effect; sensors of different natures provide dual protection for the safety of the equipment, effectively preventing equipment accidents caused by single sensor failures, and the interlocking effectiveness has been qualitatively improved. After the interlocking takes effect, the ground roller no longer executes the forward operation requirements according to the original logic until the interlocking is released.

[0020] Step S3: The crane PLC system controls the crane clamp to descend and start lifting the slab. While the crane hoist is descending, the crane weighing device tracks the weight of the slab carried by the crane clamp. The height of the clamp and the weight of the slab form a corresponding relationship. When the crane clamp carries the slab up, the rising position is between -1350mm and -950mm. The height of the crane clamp and the weight of the slab change nonlinearly. The relationship table is as follows:

[0021]

[0022] When in the current position, if the deviation of the slab weight is greater than 10%, an alarm will be generated, and the interlocking cannot be released. At the same time, the relationship table can be used to verify whether the corresponding sensors are accurate. If there are frequent alarms, the corresponding sensors will be checked or replaced, which greatly improves the effectiveness of the interlocking.

[0023] Step S4: The crane PLC system controls the crane fixture to start rising. The weight of the slab carried by the crane fixture changes. At the position of about 0m, the crane weighing device begins to stabilize. Therefore, the verification model is established: At the current position, the deviation of the overhead crane weighing device satisfies the above verification model, and its weight is kept stable at the position of 60mm to 140mm, and any position between 60mm and 140mm is less than 5% of the average of the five positions; at this time, it is judged that the slab has left the ground roller table, but the system still increases the safety distance, and after judging that the slab has left the roller table, it still rises h meters as the safety distance;

[0024] Step S5: When the overhead crane fixture continues to rise and the height encoder detects that the height of the overhead crane fixture is greater than the safety distance h meters and the weight of the slab detected by the overhead crane weighing device is greater than 85% of the weight of the slab, the interlocking of the ground track stop is released;

[0025] Step S6: The interlock release signal is sent, and a start pulse is sent to the ground roller conveyor. When the coding cable address detector does not detect that the overhead crane is directly above the roller conveyor, and both the No. 1 cold metal detector and the No. 2 cold metal detector have no signal, the ground roller conveyor is released from the interlock and starts to run.

[0026] Further, in step S4, h=1-2, and the rise is 1-2 meters as a safety distance.

[0027] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are:

[0028] The present invention realizes full-automatic operation without the need for ground operators to operate and confirm, and achieves reliability through two sets of safety interlocking devices.

[0029] The present invention can redundantly realize the safety interlocking of the overhead crane and the roller table, and the hardware belongs to different detection types, which has high effectiveness and error prevention; it realizes the full automation of the roller table operation, can greatly reduce the influence of the overhead crane on the roller table operation during hoisting, improves the production efficiency, and has high efficiency.

[0030] In the present invention, the ground roller interlocking is effective by using the continuous position of the crane detected by the coding cable address detector and the switch position signal of the crane detected by the redundant cold detection positioning sensor. The ground roller interlocking is ineffective by using the slab weight measured by the crane weighing device and the height of the crane fixture measured by the height encoder. Sensors of different properties provide double protection for the safety of the equipment, effectively preventing equipment accidents caused by single sensor failure, and the interlocking effectiveness is qualitatively improved.

[0031] The present invention realizes the full automation of the ground roller operation. When the production is running smoothly, the ground roller is in a completely automatic state, reducing the number of ground roller operation positions. At the same time, the appropriate time for interlocking release is found through experiments, the operation efficiency of the ground roller is maximized, the restriction point of the ground roller operation on the productivity improvement is eliminated, the production efficiency is greatly improved, and it is highly efficient.

[0032] The present invention is fully automatic, greatly reducing the operation of operators; it is highly efficient, and the time from the stop of the ground roller to the start of the ground roller is extremely optimized, which greatly increases the production efficiency; it is safe and reliable, and redundant interlocking control prevents the occurrence of equipment accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a control system diagram of the device of the present invention.

[0034] Figure 2 The figure is a system function flow chart of the method of the present invention.

[0035] Among them: coding cable address detector 1, redundant cold detection positioning sensor 2, overhead crane weighing device 3, height encoder 4, overhead crane PLC system 5, ground roller PLC system 6, on-board wireless WIFI 7, ground wireless WIFI 8, roller transmission system 9. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the embodiments.

[0037] A device for safety interlocking of roller table and overhead crane, such as Figure 1 As shown: it includes a roller system and an overhead crane system. The roller system includes a ground roller PLC system 6, a redundant cold inspection positioning sensor 2, a ground wireless WIFI8, and a roller transmission system 9. The redundant cold inspection positioning sensor 2, the ground wireless WIFI8, and the roller transmission system 9 are all connected to the ground roller PLC system 6.

[0038] The overhead crane system includes an overhead crane PLC system 5, a coding cable address detector 1, an overhead crane weighing device 3, a height encoder 4, and an on-board wireless WIFI 7. The coding cable address detector 1, the overhead crane weighing device 3, the height encoder 4, and the on-board wireless WIFI 7 are all connected to the overhead crane PLC system 5.

[0039] The coding cable address detector 1 is installed on one side of the overhead crane, connected to the coding cable under the overhead crane, used for continuous positioning of the overhead crane, and can detect the continuous position of the overhead crane.

[0040] The redundant cold detection positioning sensor 2 is installed on the overhead travelling platform, and is used to directly detect the position signal of the overhead travelling platform switch (that is, to detect whether the overhead travelling platform is in place). The number of the redundant cold detection positioning sensor 2 is 2;

[0041] The crane weighing device 3 is installed below the wire rope drum at the crane hook and is used to measure the weight of the slab carried by the crane clamp;

[0042] The height encoder 4 is coaxially mounted to the rear of the wire rope drum drive motor and is used to calculate the height of the overhead crane clamp;

[0043] The overhead crane PLC system 5 is used to collect signals from sensors on the overhead crane and process and calculate the above signals;

[0044] The ground roller table PLC system 6 is used to collect ground sensor signals;

[0045] The on-board wireless WIFI 7 is connected to the ground wireless WIFI 8 for signal interaction between the ground roller track PLC system 6 and the overhead crane PLC system 5;

[0046] The roller transmission system 9 is used to directly control the operation of the roller.

[0047] In terms of selection, the redundant cold inspection positioning sensor 2 is a cold metal detector, which is arranged on the left and right sides of the ground roller respectively; the overhead crane weighing device 3 is an overhead crane weighing instrument, and the height encoder 4 is a drum encoder.

[0048] The interlocking method of the above device is:

[0049] Step S1: Arrange the device and make preparations in place, and name the two redundant cold detection positioning sensors 2 as No. 1 cold metal detector and No. 2 cold metal detector respectively;

[0050] Step S2: The coding cable address detector 1 and the redundant cold inspection positioning sensor 2 detect in real time, and the on-board wireless WIFI7 and the ground wireless WIFI8 interact in real time. When the coding cable address detector 1 detects that the overhead crane is directly above the roller, and at the same time the No. 1 cold metal detector has a signal, and the No. 2 cold metal detector has a signal (the two redundant cold inspection positioning sensors 1 are not only redundantly arranged, but also arranged on the left and right sides of the roller, which can accurately detect that the overhead crane is above the ground roller), and at the same time the ground roller is in automatic mode, the ground roller PLC system 6 controls the roller transmission system 9, and the roller transmission system 9 controls the ground roller to stop, and the interlock takes effect. Sensors of different natures provide dual protection for the safety of the equipment, effectively preventing equipment accidents caused by single sensor failures, and the effectiveness of the interlock has been qualitatively improved. After the interlock takes effect, the ground roller no longer executes the forward operation requirements according to the original logic until the interlock is released.

[0051] Step S3: The crane PLC system 5 controls the crane clamp to descend and starts to lift the slab. While the crane hoist is descending, the crane weighing device 3 tracks the weight of the slab carried by the crane clamp. The height of the clamp and the weight of the slab form a corresponding relationship. When the crane clamp carries the slab up, the rising position is between -1350mm and -950mm. The height of the crane clamp and the weight of the slab change nonlinearly. The relationship table is as follows:

[0052]

[0053] When in the current position, if the deviation of the slab weight is greater than 10%, an alarm will be generated, and the interlocking cannot be released. At the same time, the relationship table can be used to verify whether the corresponding sensors are accurate. If there are frequent alarms, the corresponding sensors will be checked or replaced, which greatly improves the effectiveness of the interlocking.

[0054] Step S4: The crane PLC system 5 controls the crane fixture to start rising, and the weight of the slab carried by the crane fixture changes. At the position of about 0m, the crane weighing device 3 begins to stabilize, so the verification model is established:

[0055]

[0056] At the current position, the deviation of the overhead crane weighing device 3 satisfies the above-mentioned verification model, and at the same time, its weight must be kept stable at the position of 60mm to 140mm, and any position between 60mm and 140mm is less than 5% of the average of the five positions; at this time, it is judged that the slab has left the ground roller conveyor, but the system still increases the safety distance, and after judging that the slab has left the roller conveyor, it still rises h meters as a safety distance; h=1~2, and rises 1~2 meters as a safety distance.

[0057] Step S5: When the overhead crane fixture continues to rise and the height encoder 4 detects that the height of the overhead crane fixture is greater than the safety distance h meters and the weight of the slab detected by the overhead crane weighing device 3 is greater than 85% of the weight of the slab, the interlocking of the ground track stop is released;

[0058] Step S6: The interlock release signal is sent, and a start pulse is sent to the ground roller conveyor. When the coding cable address detector 1 does not detect that the overhead crane is directly above the roller conveyor, and both the No. 1 cold metal detector and the No. 2 cold metal detector have no signal, the ground roller conveyor is released from the interlock and starts to run.

[0059] The following is an explanation with reference to embodiments.

[0060] like Figure 1 , the crane weighing device 3 is installed under the crane hook wire rope drum to detect the weight of the slab carried by the crane fixture; the height encoder 4 is coaxially installed behind the wire rope drum drive motor to calculate the height of the crane fixture; the coding cable address detector 1 is installed on one side of the crane, and is used to continuously position the crane in conjunction with the coding cable installed under the car; the redundant cold inspection positioning sensor 2 is installed on the crane platform to directly detect whether the crane is in place. The crane PLC system 5 is used to collect sensor signals on the car and perform calculations; the roller PLC system 6 is used to collect ground sensor signals; the wireless WIFI 7 on the car and the wireless WIFI 8 on the ground are used for signal interaction between the crane and the roller PLC; the roller transmission system 9 is used to directly control the operation of the roller.

[0061] Methods such as Figure 2 The functional flow chart shown includes the following steps:

[0062] Step 1, the coded cable address detector 1 detects that the overhead crane is directly above the ground roller, and at the same time, the No. 1 cold metal detector has a signal, and the No. 2 cold metal detector has a signal (the two redundant cold detection positioning sensors 2 are not only redundantly arranged, but also arranged on the left and right sides of the ground roller, which can accurately detect that the overhead crane is above the ground roller). When the ground roller is in automatic mode, the interlock takes effect. Sensors of different natures provide double protection for the safety of the equipment, effectively preventing equipment accidents caused by single sensor failure, and the effectiveness of the interlock has been qualitatively improved. After the interlock takes effect, the roller no longer executes the forward operation requirements according to the original logic until the interlock is released.

[0063] Step 2: The overhead crane starts to lift the slab, and the fixture descends. The weight of the fixture is tracked as the fixture descends. The height of the fixture and the weight change form a corresponding relationship, which can verify the accuracy of the sensor. The mutual verification of different sensors greatly improves the effectiveness of the chain.

[0064] Step 3: The overhead crane clamp starts to rise and the weight of the clamp also changes. Based on the mutually verified models, it is judged that the slab has left the ground roller table, but the system still increases the safety distance. After judging that the slab has left the roller table, it still rises 1 meter as a safety distance.

[0065] Step 4: The overhead crane fixture continues to rise. When it is above the safe distance, the interlock is released. The signal for releasing the interlock also sends a start pulse, and the crane will automatically start when the roller conveyor allows.

[0066] The coded cable address detector 1 and the redundant cold inspection positioning sensor 2 of the present invention are combined with logical calculation to form a parking interlock of the roller, and the overhead crane weighing device 3 and the height encoder 4 are combined with logical calculation (for example, the slab weight measured by the overhead crane weighing device 3 is greater than 85% of the weight of the slab, and the height of the clamp measured by the height encoder 4 of the overhead crane clamp is greater than 1m from the roller, that is, an interlock release signal is organized) to form a roller interlock release command, thereby realizing a safety interlock between the ingot conveying roller and the ingot lifting crane, and greatly improving the conveying efficiency of the roller.

[0067] The present invention realizes the full automation of the ground roller operation. When the production is running smoothly, the ground roller is in a completely automatic state, reducing the number of ground roller operation positions. At the same time, through a large number of tests, the appropriate time for interlocking release is found, the operation efficiency of the ground roller is maximized, the restriction point of the ground roller operation on the productivity improvement is eliminated, the production efficiency is greatly improved, and it is highly efficient.

Claims

1. A device for safety interlocking of a roller table and an overhead crane, characterized in that: It includes a roller system and an overhead crane system. The roller system includes a ground roller PLC system (6), a redundant cold detection positioning sensor (2), a ground wireless WIFI (8), and a roller transmission system (9). The redundant cold detection positioning sensor (2), the ground wireless WIFI (8), and the roller transmission system (9) are all connected to the ground roller PLC system (6). The crane system comprises a crane PLC system (5), a coding cable address detector (1), a crane weighing device (3), a height encoder (4), and a vehicle wireless WIFI (7), wherein the coding cable address detector (1), the crane weighing device (3), the height encoder (4), and the vehicle wireless WIFI (7) are all connected to the crane PLC system (5); The coding cable address detector (1) is installed on one side of the overhead crane, connected to the coding cable under the overhead crane, used for continuous positioning of the overhead crane, and can detect the continuous position of the overhead crane; Redundant cold detection positioning sensors (2) are installed on the overhead travelling platform and are used to directly detect the position signal of the overhead travelling platform switch quantity. The number of the redundant cold detection positioning sensors (2) is 2; The crane weighing device (3) is installed below the wire rope drum at the crane hook and is used to measure the weight of the slab carried by the crane clamp; A height encoder (4) is coaxially mounted to the rear of the wire rope drum drive motor and is used to calculate the height of the overhead travelling crane clamp; The overhead crane PLC system (5) is used to collect signals from sensors on the overhead crane and process and calculate the above signals; The ground roller table PLC system (6) is used to collect ground sensor signals; The on-board wireless WIFI (7) is connected to the ground wireless WIFI (8) for signal interaction between the ground roller track PLC system (6) and the overhead crane PLC system (5); The roller transmission system (9) is used to directly control the operation of the roller.

2. The device for safety interlocking of a roller table and an overhead crane according to claim 1, characterized in that: The redundant cold detection positioning sensors (2) are cold metal detectors, which are arranged on the left and right sides of the ground roller conveyor respectively.

3. The device for safety interlocking of a roller table and an overhead crane according to claim 2 is characterized in that: The overhead crane weighing device (3) is an overhead crane weighing instrument, and the height encoder (4) is a drum encoder.

4. A method for safely interlocking a roller table with an overhead crane, using the device of claim 1, characterized in that The steps include: Step S1: Arrange the device and make preparations in place, and name the two redundant cold detection positioning sensors (2) as No. 1 cold metal detector and No. 2 cold metal detector respectively; Step S2: The coding cable address detector (1) and the redundant cold detection positioning sensor (2) detect in real time, and the on-board wireless WIFI (7) and the ground wireless WIFI (8) interact in real time. When the coding cable address detector (1) detects that the overhead crane is directly above the roller track, and at the same time the No. 1 cold metal detector has a signal and the No. 2 cold metal detector has a signal (the two cold metal detectors are not only redundantly arranged, but also arranged on the left and right sides of the roller track, which can accurately detect that the overhead crane is above the ground roller track), and the ground roller track is in automatic mode, the ground roller track PLC system (6) controls the roller track transmission system (9), and the roller track transmission system (9) controls the ground roller track to stop, and the interlocking takes effect; Step S3: The crane PLC system (5) controls the crane clamp to descend and starts to lift the slab. While the crane hoist is descending, the crane weighing device (3) tracks the weight of the slab carried by the crane clamp. The height of the clamp and the weight of the slab form a corresponding relationship. When the crane clamp carries the slab up, the rising position is between -1350mm and -950mm. The height of the crane clamp and the weight of the slab change nonlinearly. The relationship table is as follows: When in the current position, if the deviation of the slab weight is greater than 10%, an alarm will be generated, and the interlock cannot be released. At the same time, the relationship table can also be used to verify whether the corresponding sensors are accurate. If there are frequent alarms, the corresponding sensors should be checked or replaced. Step S4: The overhead crane PLC system (5) controls the overhead crane clamp to start rising. The weight of the slab carried by the overhead crane clamp changes. At the 0m position, the overhead crane weighing device (3) begins to stabilize. Therefore, the verification model is established: At the current position, the deviation of the overhead crane weighing device (3) satisfies the above-mentioned verification model, and at the same time, the weight is kept stable at the position of 60mm to 140mm, and any position between 60mm and 140mm is less than 5% of the average of the five positions; at this time, it is judged that the slab has left the ground roller conveyor, and after it is judged that the slab has left the roller conveyor, it still rises h meters as a safety distance; Step S5: the overhead crane fixture continues to rise, and when the height encoder (4) detects that the height of the overhead crane fixture is greater than the safety distance h meters and the weight of the slab detected by the overhead crane weighing device (3) is greater than 85% of the weight of the slab, the interlocking of the ground track stop is released; Step S6: The interlock release signal is sent, and a start pulse is sent to the ground roller conveyor. When the coding cable address detector (1) does not detect that the overhead crane is directly above the roller conveyor, and both the No. 1 cold metal detector and the No. 2 cold metal detector have no signal, the ground roller conveyor is released from the interlock and starts to run.

5. The method for safety interlocking of a roller table and an overhead crane according to claim 4, characterized in that: In step S4, h=1-2, and the rise is 1-2 meters as a safety distance.

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