A temperature-monitoring electromagnetic chuck system for long material lifting trolleys

Abstract

This invention discloses a temperature-monitoring electromagnetic chuck system for long product lifting trolleys, relating to the field of electromagnetic chuck technology. This system features a temperature sensor on one side of the electromagnetic chuck, allowing measurement of the surface temperature of the long product casting before lifting. If the surface temperature meets lifting requirements, power is restored to the electromagnetic chuck circuit breaker control circuit. This ensures that lifting conditions are met during long product lifting, preventing operators from neglecting the casting temperature due to deliberately accelerating the lifting process. The system also incorporates a pressure sensor at the bottom of the electromagnetic chuck, monitoring the pressure between the chuck and the casting. A decrease in pressure indicates weak adhesion between the casting and the chuck, alerting operators to stop lifting and find a suitable location to lower the casting.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic chuck technology for overhead cranes, specifically to a temperature-monitoring type electromagnetic chuck system for lifting long materials on an overhead crane. Background Technology

[0002] Newly produced long billets cannot be lifted immediately using electromagnetic chucks. They need to be cooled to a certain temperature before they can be lifted. This is because newly produced long billets have a high temperature, and the molecules of the billet are more active at high temperatures, making it impossible to form a sufficiently strong attraction between the electromagnetic chucks. Therefore, the surface temperature of the billet is usually cooled to below 600°C before it can be lifted.

[0003] In existing technologies, the surface temperature of cast billets is typically measured manually using a temperature gun. Before lifting with an electromagnetic chuck, the age of the long cast billet is usually estimated based on the production time. Manually measuring the temperature of the long cast billet before each lifting operation increases labor costs, and the environment around the long cast billet discharge platform is harsh, resulting in high labor intensity. However, relying solely on experience to estimate the temperature of the long cast billet increases the risk of lifting a high-temperature billet.

[0004] Existing technology, such as the invention patent with publication number CN102381622A, discloses a crane with an electromagnetic chuck, which uses a temperature sensor to monitor the internal temperature of the electromagnetic chuck and thus control its state. While using a temperature sensor to monitor the internal temperature of the electromagnetic chuck is effective, the temperature transfer is not instantaneous but involves a heat conduction process. If the electromagnetic chuck meets the starting temperature requirements before adsorbing a hot object, the hotter object will transfer heat to the chuck, causing the internal temperature of the chuck to exceed the limit for a certain period after adsorption. This can affect the chuck's adsorption performance and increase the risk of the object falling. Therefore, when lifting hot objects, it is best to directly measure the temperature of the object before deciding whether to lift it.

[0005] Existing technology, such as the utility model patent with publication number CN210628006U, discloses a liquid-cooled high-temperature resistant lifting electromagnet. Although this utility model uses cooling pipes to cool the inside of the electromagnetic chuck and avoid the problem of electromagnetic force decay due to overheating, the lack of control over the cooling system and the control over the heat transfer rate makes it difficult to control the energy consumption and cooling effect of the cooling system. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a temperature-monitoring electromagnetic chuck system for long material lifting trolleys, solving the following technical problems:

[0008] 1. The technical problem in the existing technology of using electromagnetic chucks to lift long billets is that the temperature of the long billet cannot be obtained beforehand;

[0009] 2. Existing electromagnetic chuck cooling systems lack efficient control methods.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the present invention provides the following technical solution: a temperature-monitoring type electromagnetic chuck system for lifting long materials, comprising an electromagnetic chuck, a relay, a relay control module, an electromagnetic chuck circuit breaker, and an electromagnetic chuck power supply system. The electromagnetic chuck power supply system is electrically connected to the electromagnetic chuck and provides power to the electromagnetic chuck. The electromagnetic chuck circuit breaker controls the connection between the electromagnetic chuck and the electromagnetic chuck power supply system. The output circuit of the relay is located on the control power supply of the electromagnetic chuck circuit breaker, and the relay control module is located on the control circuit of the relay.

[0012] A temperature sensor is provided on the side of the electromagnetic chuck. The temperature sensor is used to monitor the temperature of the long material and is electrically connected to the relay control module.

[0013] When the temperature sensor detects that the temperature of the long material is lower than temperature A, the relay control module connects the relay control circuit, and the relay output circuit connects the control power supply of the electromagnetic chuck circuit breaker. At this time, the electromagnetic chuck can be controlled through the electromagnetic chuck circuit breaker.

[0014] Preferably, it includes a crane monitoring system, wherein the relay control module is electrically connected to the crane monitoring system, and the crane monitoring system is used to monitor the signal of the temperature sensor.

[0015] Preferably, a pressure switch is provided at the bottom of the electromagnetic chuck. The pressure switch is used to monitor the pressure between the long material and the electromagnetic chuck. The pressure switch is electrically connected to the overhead crane monitoring system, which is used to monitor the pressure between the long material and the electromagnetic chuck.

[0016] Preferably, it includes a pressure monitoring slave device, the pressure switch is connected to the input terminal of the pressure monitoring slave device, and the output terminal of the pressure monitoring slave device is connected to the relay control module and the overhead crane monitoring system.

[0017] (III) Beneficial Effects

[0018] This invention provides a temperature-monitoring electromagnetic chuck system for lifting long materials on an overhead crane. It offers the following advantages:

[0019] (1) The temperature monitoring type long product lifting trolley electromagnetic chuck system has a temperature sensor on one side of the electromagnetic chuck, which can measure the surface temperature of the long product casting before lifting. If the surface temperature meets the lifting conditions, the power supply of the electromagnetic chuck circuit breaker control circuit is restored. This can ensure that the lifting conditions are met when the long product casting is lifted, and avoid the temperature of the long product casting being ignored by the operator due to deliberately speeding up the lifting pace.

[0020] (2) The temperature monitoring type long product lifting trolley electromagnetic chuck system has a pressure sensor installed at the bottom of the electromagnetic chuck, which can monitor the pressure between the electromagnetic chuck and the long product casting. If the pressure drops, it means that the long product casting is not firmly attached to the electromagnetic chuck. This can warn the operator to stop the lifting and handling operation and find a suitable place to put the casting down, so as to avoid the long product casting falling from the electromagnetic chuck due to insufficient adhesion and causing danger.

[0021] (3) The temperature monitoring type long material lifting trolley electromagnetic chuck system uses the air pressure difference caused by the temperature difference to push the piston, so that the cooling system can be started in advance to cool down the inside of the electromagnetic chuck before the heat is fully transferred to the electromagnetic chuck, avoiding the cooling delay caused by starting the cooling system after the heat has been fully transferred. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is the electrical schematic diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the overhead crane monitoring system of the present invention;

[0025] Figure 4 This is a schematic diagram illustrating the usage state of the present invention;

[0026] Figure 5 This is a top view of the electromagnetic chuck structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the electromagnetic cooling system of the present invention;

[0028] Figure 7 This is a schematic diagram of the temperature difference sensing device of the present invention;

[0029] Figure 8 This is a schematic diagram of the temperature difference sensing device of the present invention (piston rising);

[0030] Figure 9This is a schematic diagram of the temperature difference sensing device of the present invention (frustum-shaped air pressure chamber);

[0031] Figure 10 This is a schematic diagram of the temperature difference sensing device of the present invention (fins are provided inside the air pressure chamber A);

[0032] Figure 11 This is a schematic diagram of the temperature difference sensing device of the present invention (air pressure chamber B with a smaller flow area).

[0033] In the diagram: 1. Electromagnetic chuck; 2. Temperature sensor; 3. Pressure switch; 4. Electromagnetic chuck circuit breaker; 5. Electromagnetic chuck power supply system; 6. Relay; 7. Pressure monitoring slave device; 8. Relay control module; 9. Relay control circuit indicator light; 10. Crane monitoring system; 11. Cast billet long product; 12. Proximity switch; 13. Air pressure chamber A; 14. Air pressure chamber B; 15. Piston A; 16. Connecting rod; 17. Fin; 18. Cooling pump A; 19. Cooling pump B; 20. Cooling water tank; 21. Cooling pipe; 22. Cooling pipe fins; 23. Iron core. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: Specific implementation method that solves the technical problem of not being able to obtain the temperature of long billets before lifting them using electromagnetic chucks in the prior art.

[0036] A temperature-monitoring type electromagnetic chuck system for lifting long materials is provided for use in lifting long materials. It includes a lifting beam, electromagnetic chucks 1, relays 6, relay control modules 8, electromagnetic chuck circuit breakers 4, and an electromagnetic chuck power supply system 5. Multiple electromagnetic chucks 1 are suspended below the lifting beam, which is suspended below the gantry crane and connected to the gantry crane (e.g., ...). Figure 1 The electromagnetic chuck power supply system 5 is electrically connected to the electromagnetic chuck 1 and provides power to the electromagnetic chuck 1. The electromagnetic chuck circuit breaker 4 is used to control the connection between the electromagnetic chuck 1 and the electromagnetic chuck power supply system 5. The output circuit of the relay 6 is set on the control power supply of the electromagnetic chuck circuit breaker 4. The control power supply of the electromagnetic chuck circuit breaker 4 is connected to the normally closed interface of the relay 6 (e.g., Figure 2The relay control module 8 is installed on the control circuit of the relay 6, and the control circuit of the relay 6 is also equipped with a relay control circuit indicator 9. A temperature sensor 2 is installed on the side of the electromagnetic chuck 1. The temperature sensor 2 is used to monitor the temperature of the long material. The temperature sensor 2 is electrically connected to the relay control module 8. When the temperature sensor 2 detects that the temperature of the long material is less than 600℃, the relay control module 8 connects the control circuit of the relay 6, and the output circuit of the relay 6 connects the control power supply of the electromagnetic chuck circuit breaker 4. At this time, the electromagnetic chuck 1 can be controlled by the electromagnetic chuck circuit breaker 4.

[0037] in:

[0038] Because of the long length of the material, a temperature sensor 2 is installed on the side of each electromagnetic chuck 1. The relay control module 8 will connect the control circuit of the relay 6 only when the temperature signals obtained by all temperature sensors 2 are less than 600°C.

[0039] To facilitate monitoring the temperature of the long material surface, this embodiment also includes a crane monitoring system 10. The relay control module 8 is electrically connected to the crane monitoring system 10, and the crane monitoring system 10 is used to monitor the signal of the temperature sensor 2.

[0040] In this embodiment, the power supply of the control circuit of the electromagnetic chuck 1 can only be turned on when the surface temperature of the long material meets the lifting requirements. This avoids, to a certain extent, the problem of the crane operator deliberately ignoring the problem of the long material being too hot in order to speed up the lifting and handling of the long material.

[0041] Example 2: To facilitate monitoring of the pressure between the long material and the electromagnetic chuck

[0042] Based on Example 1, a pressure switch 3 is provided at the bottom of the electromagnetic chuck 1. The pressure switch 3 is used to monitor the pressure between the long material and the electromagnetic chuck 1. The pressure switch 3 is electrically connected to the overhead crane monitoring system 10, which is used to monitor the pressure between the long material and the electromagnetic chuck 1.

[0043] The system includes a pressure monitoring slave unit 7, a pressure switch 3 connected to the input terminal of the pressure monitoring slave unit 7, and an output terminal of the pressure monitoring slave unit 7 connected to the relay control module 8 and the overhead crane monitoring system 10.

[0044] Example 3: In order to reduce the temperature of the electromagnetic chuck and effectively control the cooling system

[0045] Based on Embodiment 1, an electromagnetic chuck cooling system is included. This system comprises a cooling pipe 21, a cooling pump A18, a temperature difference sensing device, and a cooling pump controller 181, all housed within the electromagnetic chuck 1. The outlet of cooling pump A18 is connected to the cooling pipe 21, providing power to the cooling medium within the pipe. The temperature difference sensing device is electrically connected to the cooling pump controller 181, and vice versa. The temperature difference sensing device includes a proximity switch 12 and a temperature difference sensor. The proximity switch 12 is electrically connected to the cooling pump controller 181, and the temperature difference sensor includes a pressure chamber A13 and a pressure chamber B14. The pressure chamber B14 is connected to the interior of the electromagnetic chuck 1's outer shell. The proximity switch 12 is located outside the pressure chamber B14, and the temperature difference sensing device is located inside the housing of the electromagnetic chuck 1. The bottom of the pressure chamber A13 is connected to the bottom of the housing of the electromagnetic chuck 1. A piston A15 is installed inside the pressure chamber A13, and a piston B is installed inside the pressure chamber B14. The pressure chamber B14 is located above the pressure chamber A13. The piston A15 and the piston B are connected by a connecting rod 16, which passes through the top of the pressure chamber A13 and the bottom of the pressure chamber B. When the air pressure in the pressure chamber B14 is greater than the air pressure in the pressure chamber A13, the connecting rod 16, the piston A15, and the piston B will all move upward. When the piston B moves to the height of the proximity switch 12, the proximity switch 12 can be triggered.

[0046] Among them: such as Figure 6 The cooling pipe 21 circuit is also equipped with a cooling water tank 20 and a cooling pump B19. The cooling pump B19 is connected in parallel with the cooling pump A18 at the outlet of the cooling water tank 20.

[0047] In order not to affect the piston B triggering the proximity switch 12, the pneumatic chamber B14 can be made of plastic, and the piston B can be made of metal.

[0048] During normal operation, cooling pump B19 runs continuously. When the temperature difference between the suspended object and the electromagnet is too large, cooling pump A18 is activated to enhance cooling.

[0049] Those skilled in the art can select one or more of the following methods to adjust the sensitivity of the temperature difference sensing device:

[0050] 1. The air pressure chamber A13 is a frustum-shaped air pressure chamber that is larger at the bottom and smaller at the top;

[0051] 2. The air pressure chamber A13 is equipped with heat exchange fins 17;

[0052] 3. The flow area of ​​the air pressure chamber B14 is smaller than that of the air pressure chamber A13.

[0053] The specific dimensions or materials can be determined by those skilled in the art through a limited number of experiments.

[0054] How to use Example 3:

[0055] Step 1: The electromagnetic chuck 1 is energized and attracts the long billet 11 with a high temperature;

[0056] Step 2: The heat of the cast billet 11 is transferred to the pneumatic chamber A13 through the outer shell of the electromagnetic chuck 1, and the air pressure in the pneumatic chamber A13 rises as a result. At this time, the connecting rod 16, piston A15 and piston B will all move upward. When the air pressure in the pneumatic chamber A13 rises to a certain level, piston B will trigger the proximity switch 12.

[0057] Step 3: Proximity switch 12 starts cooling pump A18 through cooling pump controller 181 to accelerate the cooling of electromagnetic chuck 1.

[0058] Comparative Example 1: Using thermocouples to monitor the temperature of a suspended object

[0059] The difference from Example 3 is that the temperature difference sensing device is replaced by a thermocouple, which is electrically connected to the cooling pump controller 181. The cooling pump A18 is started when the thermocouple detects a certain temperature.

[0060] The table below shows the temperature changes inside the electromagnetic chuck 1 when lifting the same 500℃ long billet.

[0061] time 5s 10s 15s 20s 25s 30s Example 3 39℃ 40℃ 39℃ 39℃ 39℃ 39℃ Comparative Example 1 39℃ 40℃ 41℃ 42℃ 43℃ 44℃ time 35s 45s 55s 60s Example 3 39℃ 40℃ 39℃ 39℃ Comparative Example 1 45℃ 46℃ 45℃ 45℃

[0062] The table below shows the start-up time of cooling pump A18.

[0063] Time point Example 3 10s after adsorption of the long billet Comparative Example 1 55s after adsorption of the long billet

[0064] The optimal operating temperature of the electromagnetic chuck should be below 40°C. However, the lifting and transportation time of the electromagnetic chuck may only be about 1 to 2 minutes each time. Example 3 can ensure that the temperature inside the electromagnetic chuck is always kept below 40°C. In contrast, Comparative Example 1, due to the relatively delayed start-up, may cause the electromagnetic chuck to be in an overheated state for most of the 1 to 2 minutes of the entire lifting and transportation process. Over time, this will reduce the service life of the electromagnetic chuck.

[0065] As can be seen from the table above, the earlier the cooling pump A18 starts, the more beneficial it is for cooling the electromagnetic chuck 1. Thermocouples have a large thermal inertia, so it takes a long time to detect the temperature rise. However, in Example 3, a temperature difference sensing device is used, which can use the temperature to heat the gas and then the gas expands rapidly, thereby pushing the piston to trigger the proximity switch 12, thus achieving the effect of starting the cooling pump A18 as early as possible, and can automatically reset after the temperature drops.

[0066] It should be noted that in the description of the invention, the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the description of the structure of the invention shown in the accompanying drawings. They are only for the convenience of describing the invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0067] The terms "first" and "second" in this technical solution are merely designations for corresponding structures that are identical or similar, or that perform similar functions. They do not represent an arrangement of the importance of these structures, nor do they imply any ranking, comparison of size, or other meaning.

[0068] Furthermore, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two structures. Those skilled in the art can understand the specific meaning of the above terms in this invention by considering the overall concept of the invention and the specific context of the solution.

Claims

1. A temperature-monitoring type electromagnetic chuck system for lifting long materials on an overhead crane, used for lifting long materials, comprising an electromagnetic chuck (1), a relay (6), a relay control module (8), an electromagnetic chuck circuit breaker (4), and an electromagnetic chuck power supply system (5), wherein the electromagnetic chuck power supply system (5) is electrically connected to the electromagnetic chuck (1) and provides power to the electromagnetic chuck (1), and the electromagnetic chuck circuit breaker (4) is used to control the connection between the electromagnetic chuck (1) and the electromagnetic chuck power supply system (5), characterized in that: The output circuit of the relay (6) is set on the control power supply of the electromagnetic chuck circuit breaker (4), and the relay control module (8) is set on the control circuit of the relay (6); A temperature sensor (2) is provided on the side of the electromagnetic chuck (1). The temperature sensor (2) is used to monitor the temperature of the long material. The temperature sensor (2) is electrically connected to the relay control module (8). When the temperature sensor (2) detects that the temperature of the long material is lower than temperature A, the relay control module (8) connects the control circuit of the relay (6), and the output circuit of the relay (6) connects the control power supply of the electromagnetic chuck circuit breaker (4). At this time, the electromagnetic chuck (1) can be controlled by the electromagnetic chuck circuit breaker (4).

2. The temperature monitoring type electromagnetic chuck system for long material lifting trolleys according to claim 1, characterized in that: Includes a crane monitoring system (10), the relay control module (8) is electrically connected to the crane monitoring system (10), and the crane monitoring system (10) is used to monitor the signal of the temperature sensor (2).

3. The temperature monitoring type electromagnetic chuck system for long material lifting trolleys according to claim 2, characterized in that: The bottom of the electromagnetic chuck (1) is provided with a pressure switch (3), which is used to monitor the pressure between the long material and the electromagnetic chuck (1). The pressure switch (3) is electrically connected to the overhead crane monitoring system (10), which is used to monitor the pressure between the long material and the electromagnetic chuck (1).

4. A temperature monitoring type electromagnetic chuck system for long material lifting trolleys according to claim 2 or 3, characterized in that: It includes a pressure monitoring slave device (7), the pressure switch (3) is connected to the input terminal of the pressure monitoring slave device (7), and the output terminal of the pressure monitoring slave device (7) is connected to the relay control module (8) and the overhead crane monitoring system (10).

5. The temperature monitoring type electromagnetic chuck system for long material lifting trolleys according to claim 1, characterized in that: The system includes an electromagnetic chuck cooling system, comprising a cooling pipe (21) disposed within the electromagnetic chuck (1), a cooling pump A (18), a temperature difference sensing device, and a cooling pump controller (181). The outlet of the cooling pump A (18) is connected to the cooling pipe (21), and the cooling pump A (18) is used to provide power to the cooling medium in the cooling pipe (21). The temperature difference sensing device is electrically connected to the cooling pump controller (181), and the cooling pump controller (181) is electrically connected to the cooling pump A (18). The temperature difference sensing device includes a proximity switch (12) and a temperature difference sensor. The proximity switch (12) is electrically connected to the cooling pump controller (181). The temperature difference sensor includes a pressure chamber A (13) and a pressure chamber B (14). The pressure chamber B (14) is connected to the interior of the outer shell of the electromagnetic chuck (1). The switch (12) is located outside the air pressure chamber B (14). The temperature difference sensing device is located inside the outer shell of the electromagnetic chuck (1). The bottom of the air pressure chamber A (13) is connected to the bottom of the outer shell of the electromagnetic chuck (1). A piston A (15) is located inside the air pressure chamber A (13). A piston B is located inside the air pressure chamber B (14). The air pressure chamber B (14) is located above the air pressure chamber A (13). The piston A (15) and the piston B are connected by a connecting rod (16). The connecting rod (16) passes through the top of the air pressure chamber A (13) and the bottom of the air pressure chamber B. When the air pressure in the air pressure chamber B (14) is greater than the air pressure in the air pressure chamber A (13), the connecting rod (16), piston A (15) and piston B will all move upward. When piston B moves to the height of the proximity switch (12), the proximity switch (12) can be triggered.

6. The temperature monitoring type electromagnetic chuck system for long material lifting trolleys according to claim 5, characterized in that: The air pressure chamber A(13) is a frustum-shaped air pressure chamber that is larger at the bottom and smaller at the top.

7. The temperature monitoring type electromagnetic chuck system for long material lifting trolleys according to claim 5, characterized in that: The air pressure chamber A (13) is provided with heat exchange fins (17).

8. The temperature monitoring type electromagnetic chuck system for long material lifting trolleys according to claim 5, characterized in that: The flow area of ​​the air pressure chamber B (14) is smaller than that of the air pressure chamber A (13).

9. A method of using a temperature monitoring type electromagnetic chuck system for lifting long materials on an overhead crane according to claim 5, characterized in that: Includes the following steps: Step 1: The electromagnetic chuck (1) is energized and attracts the long billet (11) with a high temperature; Step 2: The heat of the cast billet (11) is transferred to the pneumatic chamber A (13) through the outer shell of the electromagnetic chuck (1), and the air pressure in the pneumatic chamber A (13) rises as a result. At this time, the connecting rod (16), piston A (15) and piston B will all move upward. When the air pressure in the pneumatic chamber A (13) rises to a certain level, piston B will trigger the proximity switch (12). Step 3: The proximity switch (12) starts the cooling pump A (18) through the cooling pump controller (181) to accelerate the cooling of the electromagnetic chuck (1).

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