Over-temperature protection system for hot film heating block of film wrapping machine and film wrapping machine applying over-temperature protection system

Abstract

The utility model relates to an over-temperature protection system for a hot film heating block of a film wrapping machine and the film wrapping machine applying the over-temperature protection system. The overtemperature protection system comprises n temperature protection switches and an overtemperature protection control circuit, wherein the n temperature protection switches are arranged on the hot film heating block in a one-to-one correspondence manner; the overtemperature protection control circuit is used for controlling a heating control circuit to disconnect a power supply when any temperature protection switch is disconnected; the temperature protection switch has a set action temperature, when the temperature of the hot film heating block is lower than the action temperature, the temperature protection switch is switched on, and when the temperature of the hot film heating block reaches or is higher than the action temperature, the temperature protection switch is switched off. The film wrapping machine comprises a film ironing mechanism, a heating control circuit for controlling the film ironing heating block and the overtemperature protection system for the film ironing heating block of the film wrapping machine. According to the utility model, the overtemperature problem of the hot film heating block of the existing film wrapping machine can be solved, the safety of equipment and environment can be guaranteed, and the damage to the equipment and environment is avoided.

Description

Technical Field

[0001] The utility model relates to a film wrapping machine and an over-temperature protection system of a film hot-film heating block therein. Background Art

[0002] The film wrapping machine is used to package items, which can not only improve production efficiency but also prevent items from being damaged during transportation, and play a role in dust, moisture and cleaning. After the items are packaged, the tail end of the wrapping film needs to be cut off and heated with a heater to make it adhere to the surface of the items. The normal heating temperature of the heater is 100℃, but when the temperature sensor, temperature control instrument or electrical appliances in the heating control circuit of the heater fails, the heater will continue to heat and the temperature will continue to rise, causing the items to be burned during use, or even worse, causing a fire. Summary of the invention

[0003] The utility model aims to provide an over-temperature protection system for a film wrapping machine's hot-film heating block, which can solve the over-temperature problem of a heating block in an existing film wrapping machine, thereby preventing the film wrapping machine and related environment from being damaged.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A film wrapping machine hot stamping heating block over-temperature protection system is arranged in the film wrapping machine's hot stamping mechanism and connected to a heating control circuit in the film wrapping mechanism for controlling n film wrapping heating blocks, where n is a positive integer. The film wrapping machine hot stamping heating block over-temperature protection system comprises n temperature protection switches which are arranged one-to-one on the film wrapping heating blocks and can be opened or closed, and an over-temperature protection control circuit for controlling the heating control circuit to disconnect the power supply when any of the temperature protection switches is opened; the temperature protection switch has a set action temperature, when the temperature of the film wrapping heating block is lower than the action temperature, the temperature protection switch is closed, and when the temperature of the film wrapping heating block reaches or exceeds the action temperature, the temperature protection switch is opened; the over-temperature protection control circuit is respectively connected to the temperature protection switch and the heating control circuit.

[0006] The over-temperature protection control circuit includes a switching power supply for outputting a working power supply, n heating block over-temperature alarm relays, a heating block control relay and a controller that outputs different power signals based on different input signals. The input side of the switching power supply is connected to an external power supply. The temperature protection switch and the coil of the heating block over-temperature alarm relay are connected in series one by one and are respectively connected between the output positive pole and the output negative pole of the switching power supply. The input positive pole of the controller is connected to the output positive pole of the switching power supply. The normally closed contacts of the n heating block over-temperature alarm relays are connected in parallel between the output negative pole of the switching power supply and the input negative pole of the controller. The output positive pole of the controller is connected to the output positive pole of the switching power supply. The coil of the heating block control relay is connected between the output negative pole of the controller and the output negative pole of the switching power supply. The normally open contact of the heating block control relay is arranged in the heating control circuit.

[0007] The over-temperature protection control circuit also includes an over-temperature protection main switch, and the input side of the switching power supply is connected to the external power supply via the over-temperature protection main switch.

[0008] The heating control circuit includes n heating block temperature sensors for detecting the temperature of the corresponding hot film heating blocks and outputting corresponding temperature detection signals, n heating block temperature control instruments connected one-to-one with each of the heating block temperature sensors and outputting relay action signals based on the temperature detection signals, and n solid-state relays that act based on the corresponding relay action signals. Each of the hot film heating blocks and each of the solid-state relays are connected in series one-to-one and then in parallel to form a heating module. The normally open contact of the heating block control relay is directly connected between the heating module and the external power supply, or the normally open contact of the heating block control relay is connected in a bypass module to indirectly control the connection or disconnection between the heating module and the external power supply.

[0009] When the normally open contact of the heating block control relay is connected in the bypass module to indirectly control the connection or disconnection between the heating module and the external power supply, the heating control circuit also includes a heating block main contactor, and the normally open contact of the heating block main contactor is connected between the heating module and the external power supply. One end of the normally open contact of the heating block control relay is connected to the external power supply, and the other end is connected to the coil of the heating block main contactor to form the bypass module.

[0010] The heating control circuit also includes a main switch of the heating main circuit; when the normally open contact of the heating block control relay is directly connected between the heating module and the external power supply, the normally open contact of the heating block control relay is connected to the external power supply via the main switch of the heating main circuit; when the normally open contact of the heating block control relay is connected in the bypass module and indirectly controls the connection or disconnection between the heating module and the external power supply, the bypass module and the heating module are respectively connected to the external power supply via the main switch of the heating main circuit.

[0011] The working power supply output by the switching power supply is a 24V DC power supply.

[0012] The temperature protection switch adopts a bimetallic strip as a temperature sensing element.

[0013] The utility model also provides a film wrapping machine with an over-temperature protection function of a film heating block, thereby improving safety. The solution is:

[0014] A film wrapping machine comprises a film hot stamping mechanism, wherein the film hot stamping mechanism comprises n film hot stamping heating blocks, a heating control circuit for controlling the film hot stamping heating blocks, and the above-mentioned film wrapping machine film hot stamping heating block over-temperature protection system.

[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art: the utility model can solve the over-temperature problem of the hot film heating block of the existing film wrapping machine, can ensure the safety of the equipment and the environment, and avoid damage to the equipment and the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a schematic diagram of the hot film mechanism of the film wrapping machine.

[0017] Attached Figure 2 This is a partial circuit diagram of the heating control circuit in the film wrapping machine.

[0018] Attached Figure 3 This is a partial circuit diagram of the heating control circuit in the film wrapping machine.

[0019] Attached Figure 4 This is a partial circuit diagram of the over-temperature protection system of the hot-film heating block of the film wrapping machine.

[0020] Attached Figure 5 This is a partial circuit diagram of the over-temperature protection system of the hot-film heating block of the film wrapping machine.

[0021] In the above drawings: 1. Over-temperature protection main switch; 2. Switching power supply; 3. No. 1 temperature protection switch; 4. Coil of No. 1 over-temperature alarm relay KA16; 5. No. 2 temperature protection switch; 6. Coil of No. 2 over-temperature alarm relay KA17; 7. Main switch of heating main circuit; 8. Normally open contact of heating block main contactor KM4; 9. No. 2 solid-state relay; 10. No. 1 solid-state relay; 11. No. 1 hot-stamping heating block; 12. No. 2 hot-stamping heating block; 13. Normally open contact of heating block control relay KA15; 14. Coil of heating block main contactor KM4; 15. No. 1 heating block temperature control instrument; 16. No. 1 heating block temperature sensor; 17. No. 2 heating block temperature control instrument; 18. No. 2 heating block temperature sensor; 19. No. 1 over-temperature alarm relay KA16 normally closed contact; 20. No. 2 over-temperature alarm relay KA16 normally closed contact; 21. Heating block control relay KA15 coil. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the embodiments shown in the accompanying drawings.

[0023] Embodiment 1: As shown in the attached Figure 1 As shown in FIG. 1 , the film wrapping machine includes a film hot stamping mechanism for heating the film material so that it adheres to the surface of the article. The film hot stamping mechanism includes the following Figure 1 The n (n is a positive integer) hot film heating blocks shown in the attached Figure 2 and attached Figure 3 The heating control circuit shown in the figure is also equipped with the following Figure 4 and attached Figure 5 The over-temperature protection system of the film wrapping machine heating block is shown. The heating control circuit is used to control the film wrapping heating block to heat. The over-temperature protection system of the film wrapping machine heating block is connected to the heating control circuit. In this embodiment, the film wrapping mechanism is provided with two film wrapping heating blocks, namely, the film wrapping heating block No. 1 11 and the film wrapping heating block No. 2 12.

[0024] As attached Figure 4 and attached Figure 5 As shown, the over-temperature protection system of the hot-film heating block of the film wrapping machine includes n temperature protection switches and an over-temperature protection control circuit.

[0025] n temperature protection switches are arranged one by one on the hot stamping heating block, and can be opened or closed. Specifically, the temperature protection switch has a set action temperature. When the temperature of the corresponding hot stamping heating block is lower than the action temperature, the temperature protection switch is closed. When the temperature of the corresponding hot stamping heating block reaches or exceeds the action temperature, the temperature protection switch is opened. In this embodiment, two temperature protection switches corresponding to the hot stamping heating block No. 1 11 and the hot stamping heating block No. 2 12 are arranged, namely, the temperature protection switch No. 1 3 and the temperature protection switch No. 2 4.

[0026] The temperature protection switch uses a bimetallic strip as a temperature sensing element. When the temperature is lower than the action temperature of the bimetallic strip, the bimetallic strip is in a free state and the contacts are in a closed state. When the temperature rises to the action temperature, the bimetallic strip generates internal stress due to the heat and quickly moves, opening the contacts and cutting off the circuit, thereby playing a thermal protection role. The contact disconnection of the temperature protection switch is only affected by the temperature of the measured object and is not affected by other factors.

[0027] The over-temperature protection control circuit is connected to the temperature protection switch and the heating control circuit respectively. It is used to control the heating control circuit to disconnect the power supply when any temperature protection switch is disconnected, so as to prevent the temperature of the hot film heating block from continuing to rise and causing product damage or fire. The over-temperature protection control circuit includes a switching power supply 2, n heating block over-temperature alarm relays, a heating block control relay KA15 and a controller CPU SR60. The switching power supply 2 is used to output the working power supply, and its input side is connected to the external power supply, and the working power supply outputted by the output side is a 24V DC power supply. The over-temperature protection control circuit may also include an over-temperature protection main switch 1, and the 2 input sides of the switching power supply are connected to the external power supply via the over-temperature protection main switch 1. The controller CPU SR60 is used to output different power supply signals based on different input signals. After the temperature protection switch and the coil of the heating block over-temperature alarm relay are connected in series one by one, they are respectively connected between the output positive pole and the output negative pole of the switching power supply 2, the input positive pole of the controller CPU SR60 is connected to the output positive pole of the switching power supply 2, the normally closed contacts of the n heating block over-temperature alarm relays are connected in parallel between the output negative pole of the switching power supply 2 and the input negative pole of the controller CPU SR60, the output positive pole of the controller CPU SR60 is connected to the output positive pole of the switching power supply 2, and the coil 21 of the heating block control relay KA15 is connected between the output negative pole of the controller CPU SR60 and the output negative pole of the switching power supply 2. The normally open contact 13 of the heating block control relay KA15 is arranged in the heating control circuit. In this embodiment, the over-temperature protection control circuit includes two heating block over-temperature alarm relays, namely, the No. 1 heating block over-temperature alarm relay KA16 and the No. 2 heating block over-temperature alarm relay KA17. Then the No. 1 temperature protection switch 3 is connected in series with the coil 4 of the No. 1 heating block over-temperature alarm relay KA16 and connected between the output positive and output negative poles of the switching power supply 2. The No. 2 temperature protection switch 5 is connected in series with the coil 6 of the No. 2 heating block over-temperature alarm relay KA17 and also connected between the output positive and output negative poles of the switching power supply 2. The normally closed contact 19 of the No. 1 heating block over-temperature alarm relay KA16 and the normally closed contact 20 of the No. 2 heating block over-temperature alarm relay KA17 are connected in parallel and connected between the output negative pole of the switching power supply 2 and the input negative pole of the controller CPU SR60. The controller CPU SR60 outputs a 24V DC power supply when its input side is disconnected, and does not output a 24V DC power supply when its input side is closed.

[0028] As attached Figure 2 and attached Figure 3 As shown, the heating control circuit includes n heating block temperature sensors, n heating block temperature control instruments and n solid-state relays. The heating block temperature sensors are arranged one-to-one with the hot film heating blocks, and are used to detect the temperature of the corresponding hot film heating blocks and output corresponding temperature detection signals. The heating block temperature control instruments are connected one-to-one with each heating block temperature sensor, and are used to output relay action signals based on the temperature detection signals. The solid-state relays are arranged one-to-one with the heating block temperature control instruments, and are used to act based on the corresponding relay action signals. Each hot film heating block and each solid-state relay are connected in series one-to-one and then in parallel to form a heating module. The normally open contact of the heating block control relay is directly connected between the heating module and the external power supply, or the normally open contact of the heating block control relay is connected in the bypass module to indirectly control the connection or disconnection between the heating module and the external power supply. When the normally open contact of the heating block control relay is connected in the bypass module to indirectly control the connection or disconnection between the heating module and the external power supply, the heating control circuit also includes a heating block main contactor KM4, the normally open contact 8 of the heating block main contactor KM4 is connected between the heating module and the external power supply, one end of the normally open contact 13 of the heating block control relay KA15 is connected to the external power supply, and the other end is connected to the coil 14 of the heating block main contactor KM4 to form a bypass module. This bypass connection method is adopted in this embodiment.

[0029] The heating control circuit also includes a heating main circuit main switch 7. When the normally open contact 8 of the heating block control relay KA15 is directly connected between the heating module and the external power supply, the normally open contact 8 of the heating block control relay KA15 is connected to the external power supply via the heating main circuit main switch 7. When the normally open contact 8 of the heating block control relay KA15 is connected to the bypass module and indirectly controls the connection or disconnection between the heating module and the external power supply, the bypass module and the heating module are respectively connected to the external power supply via the heating main circuit main switch 7.

[0030] In this embodiment, the heating control circuit includes two heating block temperature sensors, namely, the No. 1 heating block temperature sensor 16 and the No. 2 heating block temperature sensor 17; two heating block temperature control instruments, namely, the No. 1 heating block temperature control instrument 15 and the No. 2 heating block temperature control instrument 17; and two solid-state relays, namely, the No. 1 solid-state relay 10 and the No. 2 solid-state relay 9. Then, the No. 1 heating block temperature sensor 16 is connected to the No. 1 heating block temperature control instrument 15, and the No. 2 heating block temperature sensor 18 is connected to the No. 2 heating block temperature control instrument 17; the No. 1 hot stamping heating block 11 and the No. 1 solid-state relay 10 are connected in series to form a first branch, and the No. 2 hot stamping heating block 12 and the No. 2 solid-state relay 9 are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to form a heating module.

[0031] The working principle of the over-temperature protection system and heating control circuit of the film wrapping machine hot-stamping heating block is as follows:

[0032] Turn on the main over-temperature protection switch 1, and the switch power supply 2 outputs a 24V DC power supply. Turn on the main heating circuit switch 7, and when the temperature of the No. 1 hot film heating block 11 and the No. 2 hot film heating block 12 is normal, the No. 1 solid-state relay 10 and the No. 2 solid-state relay are closed 9, and the contacts of the No. 1 temperature protection switch 3 and the No. 2 temperature protection switch 4 are also closed, then the coil 4 of the No. 1 heating block over-temperature alarm relay KA16 and the coil 6 of the No. 2 heating block over-temperature alarm relay KA17 are energized, so that the normally closed contact 19 of the No. 1 heating block over-temperature alarm relay KA16 and the normally closed contact 20 of the No. 2 heating block over-temperature alarm relay KA17 are disconnected, and the I2.0 input terminal of the controller CPU SR60 is disconnected, and the controller CPU The Q0.7 output terminal of SR60 outputs a 24V DC power supply, and the coil 21 of the heating block control relay KA15 is energized, the normally open contact 13 of the heating block control relay KA15 is closed, the coil 14 of the heating block main contactor KM4 is energized, and the normally open contact 8 of the heating block main contactor KM4 is attracted, so that the No. 1 hot film heating block 11 and the No. 2 hot film heating block 12 are energized and heated.

[0033] During the heating process of the hot stamping heating block No. 1 11 and the hot stamping heating block No. 2 12, the temperature sensor No. 1 16 of the heating block and the temperature sensor No. 2 18 of the heating block detect the temperature in real time and output the corresponding temperature detection signal to the temperature control instrument No. 1 15 of the heating block and the temperature control instrument No. 2 17 of the heating block, so that the temperature control instrument No. 1 15 of the heating block and the temperature control instrument No. 2 17 can output the relay action signal based on the temperature detection signal, thereby controlling the corresponding solid-state relay No. 1 10 and the solid-state relay No. 2 9 to act. When the No. 1 heating block temperature sensor 16 and / or the No. 2 heating block temperature sensor 18 is abnormal, and the temperature fed back to the No. 1 heating block temperature control instrument 15 and / or the No. 2 heating block temperature control instrument 17 is lower than the actual temperature, the No. 1 heating block temperature control instrument 15 and / or the No. 2 heating block temperature control instrument 17 will continue to control the No. 1 solid-state relay 10 and / or the No. 2 solid-state relay 9 to continue to close, so that the No. 1 hot film heating block 11 and / or the No. 2 hot film heating block 12 continue to heat, which will cause the actual temperature of the No. 1 hot film heating block 11 and / or the No. 2 hot film heating block 12 to be higher than the temperature required for normal production. When the temperature of the No. 1 hot film heating block 11 and / or the No. 2 hot film heating block 12 reaches a certain height, it will cause product damage and fire, so the over-temperature protection system of the hot film heating block of the film wrapping machine needs to play a role.

[0034] When the temperature of the No. 1 hot film heating block 11 and / or the No. 2 hot film heating block 12 reaches the set operating temperature, the No. 1 temperature protection switch 3 and / or the No. 2 temperature protection switch 4 changes from closed to open, and the coil 4 of the No. 1 heating block over-temperature alarm relay KA16 and / or the coil 6 of the No. 2 heating block over-temperature alarm relay KA17 lose power, the normally closed contact 19 of the No. 1 heating block over-temperature alarm relay KA16 and / or the normally closed contact 20 of the No. 2 heating block over-temperature alarm relay KA17 closes, the I2.0 input terminal of the controller CPUSR60 closes, and the controller CPU If the Q0.7 output terminal of SR60 does not output 24V DC power supply, the coil 21 of the heating block control relay KA15 will lose power, the normally open contact 13 of the heating block control relay KA15 will be disconnected, the coil 14 of the heating block main contactor KM4 will lose power, and the normally open contact 8 of the heating block main contactor KM4 will be disconnected, thereby disconnecting the power supply of the No. 1 hot film heating block 11 and the No. 2 hot film heating block 12, so that the No. 1 hot film heating block 11 and the No. 2 hot film heating block 12 will no longer continue to heat, preventing the temperature from continuing to rise and causing product damage or fire, thereby realizing the protection function.

[0035] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An over-temperature protection system for a film-wrapping machine hot-stamping heating block, which is arranged in a film-wrapping machine hot-stamping mechanism and connected to a heating control circuit in the film-wrapping mechanism for controlling n hot-stamping heating blocks, where n is a positive integer, and is characterized in that: The over-temperature protection system of the film wrapping machine hot-stamping heating block includes n temperature protection switches which are arranged on the film wrapping heating block in a one-to-one correspondence and can be opened or closed, and an over-temperature protection control circuit for controlling the heating control circuit to disconnect the power supply when any of the temperature protection switches is opened; The temperature protection switch has a set operating temperature. When the temperature of the hot stamping heating block is lower than the operating temperature, the temperature protection switch is closed. When the temperature of the hot stamping heating block reaches or exceeds the operating temperature, the temperature protection switch is disconnected. The over-temperature protection control circuit is respectively connected to the temperature protection switch and the heating control circuit.

2. The over-temperature protection system for the film wrapping machine heating block according to claim 1 is characterized in that: The over-temperature protection control circuit includes a switching power supply for outputting a working power supply, n heating block over-temperature alarm relays, a heating block control relay and a controller that outputs different power signals based on different input signals. The input side of the switching power supply is connected to an external power supply. The temperature protection switch and the coil of the heating block over-temperature alarm relay are connected in series one by one and are respectively connected between the output positive pole and the output negative pole of the switching power supply. The input positive pole of the controller is connected to the output positive pole of the switching power supply. The normally closed contacts of the n heating block over-temperature alarm relays are connected in parallel between the output negative pole of the switching power supply and the input negative pole of the controller. The output positive pole of the controller is connected to the output positive pole of the switching power supply. The coil of the heating block control relay is connected between the output negative pole of the controller and the output negative pole of the switching power supply. The normally open contact of the heating block control relay is arranged in the heating control circuit.

3. The over-temperature protection system for the film wrapping machine hot-film heating block according to claim 2 is characterized in that: The over-temperature protection control circuit also includes an over-temperature protection main switch, and the input side of the switching power supply is connected to the external power supply via the over-temperature protection main switch.

4. The over-temperature protection system for the film wrapping machine heating block according to claim 2, characterized in that: The heating control circuit includes n heating block temperature sensors for detecting the temperature of the corresponding hot film heating blocks and outputting corresponding temperature detection signals, n heating block temperature control instruments connected one-to-one with each of the heating block temperature sensors and outputting relay action signals based on the temperature detection signals, and n solid-state relays that act based on the corresponding relay action signals. Each of the hot film heating blocks and each of the solid-state relays are connected in series one-to-one and then in parallel to form a heating module. The normally open contact of the heating block control relay is directly connected between the heating module and the external power supply, or the normally open contact of the heating block control relay is connected in a bypass module to indirectly control the connection or disconnection between the heating module and the external power supply.

5. The over-temperature protection system for the film wrapping machine hot-film heating block according to claim 4 is characterized in that: When the normally open contact of the heating block control relay is connected in the bypass module to indirectly control the connection or disconnection between the heating module and the external power supply, the heating control circuit also includes a heating block main contactor, and the normally open contact of the heating block main contactor is connected between the heating module and the external power supply. One end of the normally open contact of the heating block control relay is connected to the external power supply, and the other end is connected to the coil of the heating block main contactor to form the bypass module.

6. The over-temperature protection system for the film wrapping machine hot-film heating block according to claim 4, characterized in that: The heating control circuit also includes a main switch of the heating main circuit; when the normally open contact of the heating block control relay is directly connected between the heating module and the external power supply, the normally open contact of the heating block control relay is connected to the external power supply via the main switch of the heating main circuit; when the normally open contact of the heating block control relay is connected in the bypass module and indirectly controls the connection or disconnection between the heating module and the external power supply, the bypass module and the heating module are respectively connected to the external power supply via the main switch of the heating main circuit.

7. The over-temperature protection system for the film wrapping machine heating block according to claim 2, characterized in that: The working power supply output by the switching power supply is a 24V DC power supply.

8. The over-temperature protection system for the film wrapping machine hot-stamping heating block according to any one of claims 1 to 7, characterized in that: The temperature protection switch adopts a bimetallic strip as a temperature sensing element.

9. A film wrapping machine, comprising a film hot stamping mechanism, wherein the film hot stamping mechanism comprises n film hot stamping heating blocks and a heating control circuit for controlling the film hot stamping heating blocks, characterized in that: The film wrapping mechanism further comprises an over-temperature protection system for the film wrapping machine heating block according to any one of claims 1 to 8.

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