A sealing machine dedicated to flat bags

Abstract

The utility model discloses a kind of sealing machines special for flat bag, the sealing machine includes host computer, flip and control circuit.The host computer inside is equipped with sliding seat, suction nozzle is slidably installed on the linear slide rail of sliding seat by air nozzle connecting seat;Driving motor is meshed with rack on air nozzle connecting seat by gear, to drive suction nozzle reciprocating motion.Air nozzle connecting seat front and rear is separately provided with two position switches, for triggering control circuit to make motor accurate stop, to control the extension and retraction position of suction nozzle.The utility model replaces traditional pneumatic drive with motor gear rack drive, effectively solves the problem of inaccurate positioning, easy-to-damage sealing and slow response, with the advantages of high action accuracy, reliable operation, long service life, especially suitable for high-speed continuous packaging operation.

Description

Technical Field

[0001] This utility model relates to the field of vacuum sealing machine technology, and in particular to a sealing machine specifically for flat bags. Background Technology

[0002] Vacuum sealing machines are commonly used for flat bag packaging that requires preservation or moisture protection. The key technology lies in vacuuming before sealing. Early equipment required first vacuuming the chamber and then removing air from the bag, which was inefficient and prone to leakage. Current technology optimizes this by inserting the suction nozzle directly into the bag to create a vacuum, using the pressure difference between the inside and outside of the bag to allow the bag opening to close naturally, followed by heat sealing, significantly improving vacuuming efficiency and sealing performance.

[0003] In existing vacuum sealing machines, the suction nozzle is typically driven by a pneumatic mechanism to retract to varying degrees, completing the processes of "nozzle insertion, vacuuming, retraction, and sealing." The structure consists of a suction nozzle fixed to a sliding cylinder, a pneumatic mechanism including a bracket mounted in a base, a sliding cylinder fitted onto a guide tube of the bracket, a piston rod, and a pump. When the pump supplies air to the piston rod, the piston on the piston rod provides an outward thrust to the sliding cylinder, causing it to slide along the bracket, thus extending the suction nozzle into the bag. After vacuuming is complete, the pump stops supplying air, and the spring between the bracket and the sliding cylinder releases its elastic potential energy, pulling the sliding cylinder back to its original position, thereby retracting the suction nozzle without affecting the subsequent heat sealing process.

[0004] However, the traditional pneumatic drive structure of the suction nozzle has the following disadvantages: 1. Low action accuracy, which is prone to positioning deviation; 2. After long-term use, the pipeline sealing of the pneumatic drive structure is easily damaged, causing the suction nozzle to fail to operate normally; 3. Slow response speed, which is difficult to meet the needs of high-speed continuous packaging scenarios. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a sealing machine specifically for flat bags. It employs a gear and rack drive device to retract the air extraction nozzle, resulting in fast response, high precision, and long service life, thus overcoming the aforementioned drawbacks.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a sealing machine specifically for flat bags, comprising a control circuit, a main unit, and a flip cover. The flip cover is mounted on the front side of the main unit via a rotating shaft. The front side of the main unit has a sealing section, and the flip cover flips and presses against the sealing section. The front side of the sealing section has a bag-pressing assembly, and the rear side has a heat-sealing assembly. An air suction nozzle is movably mounted in the middle of the main unit, and the outer end of the air suction nozzle movably passes through the bag-pressing assembly and the heat-sealing assembly. A slide block is fixedly installed inside the main unit, and the slide block has a linear slide rail extending along the front-rear direction of the main unit. An air nozzle connecting seat is connected to the inner end of the air suction nozzle, and the air nozzle connecting seat is slidably mounted on the linear slide rail. A drive rack is fixedly mounted on the side of the air nozzle connecting seat, and the drive rack is parallel to the linear slide rail. A drive motor is fixedly mounted on the side of the linear slide rail, driving... The motor's output shaft is equipped with a drive gear, which meshes with a drive rack to drive the nozzle connector and the suction nozzle to reciprocate along a linear slide rail. The nozzle connector has a first position switch on its front side and a second position switch on its rear side. The control circuit is electrically connected to the heat sealing assembly, the drive motor, the first position switch, and the second position switch. The nozzle connector engages with the first and second position switches. When the nozzle connector moves forward and triggers the first position switch, the first position switch sends an electrical signal to the control circuit, which then controls the drive motor to stop, and the suction nozzle extends to the front of the bag-pressing assembly. When the nozzle connector retracts and triggers the second position switch, the second position switch sends an electrical signal to the control circuit, which then controls the drive motor to stop, and the suction nozzle retracts to the rear of the heat sealing assembly.

[0007] In a further technical solution, a connecting cavity is formed inside the air nozzle connector, and the rear end of the air extraction nozzle is airtightly inserted into the connecting cavity; an air extraction connector is provided on the side of the air nozzle connector, the air extraction connector is connected to the connecting cavity, and the air extraction connector is connected to a negative pressure air extraction device through an air pipe, the negative pressure air extraction device is located inside the main unit.

[0008] In a further technical solution, the negative pressure air extraction device includes an air extraction pump and a water vapor separation box. The air extraction pump is provided with an air inlet and an air outlet; the water vapor separation box is provided with a water vapor inlet and a drying outlet; the air extraction nozzle is connected to the water vapor inlet through an air pipe, the drying outlet is connected to the air inlet of the air extraction pump through another air pipe, and the air outlet of the air extraction pump is connected to the outside atmosphere through another air pipe.

[0009] In a further technical solution, the interior of the water vapor separator is provided with a water storage chamber, and the bottom of the water storage chamber is provided with a water vapor inlet pipe and a drying outlet pipe. The water vapor inlet pipe and the drying outlet pipe extend out of the exterior of the water vapor separator and form a water vapor inlet and a drying outlet, respectively. The tops of the water vapor inlet pipe and the drying outlet pipe extend upward to a position close to the top of the water storage chamber, and a water-liquid separation interval is left between the water vapor inlet pipe and the drying outlet pipe.

[0010] In a further technical solution, the water vapor separator is fixedly installed on the main unit, with its top open to form a water tank opening. An airtight cover is provided at the water tank opening, wherein an inverted airtight connection structure is provided between the water tank opening and the water tank cover, including a buckle formed on the inner side of the water tank opening and an inverted hook ring formed on the bottom edge of the water tank cover. The cross-sectional shape of the buckle and the inverted hook ring are respectively set in the shape of the letter "L". The inverted hook ring is fastened to the inner side of the buckle ring; a groove is formed between the buckle ring and the water tank opening, and a sealing ring is provided in the groove. The sealing ring fits tightly with the bottom surface of the water tank cover to form an airtight structure.

[0011] In a further technical solution, the main unit is equipped with an air outlet connector inside, and an exhaust port is provided at the top of the air outlet connector. The exhaust port is exposed on the surface of the main unit. The air outlet connector is connected to the exhaust port of the air pump through an air pipe. A liquid level sensor is also connected in series in the air pipe between the air outlet connector and the air pump. The liquid level sensor is electrically connected to the control circuit. When the liquid level sensor detects water, the liquid level sensor sends an electrical signal to the control circuit, and the control circuit controls the sealing machine to stop running.

[0012] In a further technical solution, a bag-cutting device is provided on the rear side of the main unit. The bag-cutting device includes a bag-cutting bracket that is flipped and installed on the main unit, and a scraper that is slidably installed on the bag-cutting bracket. A cutting clearance groove is formed on the rear surface of the main unit. When the bag-cutting bracket is flipped and closed on the main unit, the bag-cutting bracket and the surface of the main unit clamp the bag. At the same time, the sliding trajectory of the scraper coincides with the cutting clearance groove.

[0013] In a further technical solution, the bag pressing assembly includes an upper bag pressing strip and a lower bag pressing strip made of rubber, which are respectively fixed to the bag pressing mating surface of the flap and the sealing part; the heat sealing assembly includes a high-temperature resistant pressure strip and a heating wire, which are located on the inner side of the flap and the heating wire is located on the sealing part and electrically connected to the control circuit.

[0014] In a further technical solution, a winding groove is formed in the bottom recess of the main unit, and winding brackets are provided on both sides of the winding groove for winding and storing the power cord.

[0015] The advantages of this invention compared to the prior art after adopting the above structure are: 1. By employing a precision transmission mechanism consisting of a drive motor, drive gear, and drive rack to drive the reciprocating motion of the suction nozzle, the traditional pneumatic drive method is replaced. This structure has advantages such as high transmission accuracy, fast response speed, accurate positioning, stable operation, and long service life. It effectively solves the problems of positioning deviation, easy seal damage, and slow response that exist in pneumatic drives, and is particularly suitable for high-speed continuous packaging operations.

[0016] 2. By setting a first position switch and a second position switch, and triggering them in conjunction with the nozzle connector, precise electronic control of the extension and retraction positions of the suction nozzle is achieved. The control circuit can accurately control the start and stop of the drive motor based on the position signal, thereby ensuring that the suction nozzle is accurately positioned during the vacuuming and heat sealing processes, improving the automation level and reliability of the equipment operation.

[0017] 3. The negative pressure suction device integrates a water vapor separator, which effectively separates and stores water vapor introduced during the suction process, preventing water vapor from entering the suction pump and causing damage, thus extending the pump's service life. The water vapor separator adopts an inverted, airtight connection structure, facilitating disassembly and cleaning of the water storage chamber and simplifying maintenance. A liquid level sensor promptly detects when the water level is full and automatically shuts down, providing safety protection. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a structural diagram of the flip cover in the open state of this utility model.

[0021] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the air extraction nozzle in this utility model.

[0023] Figure 5 This is a schematic diagram of the water vapor separator in this utility model. Detailed Implementation

[0024] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0025] like Figures 1 to 5As shown, a sealing machine for flat bags includes a control circuit, a main unit 1, and a flip cover 2. The flip cover 2 is mounted on the front side of the main unit 1 via a rotating shaft. The front side of the main unit 1 has a sealing part 11. The flip cover 2 flips and presses against the sealing part 11. The front side of the sealing part 11 has a bag pressing assembly, and the rear side has a heat sealing assembly. An air suction nozzle 3 is movably installed in the middle of the main unit 1. The outer end of the air suction nozzle 3 movably passes through the bag pressing assembly and the heat sealing assembly. A slide 310 is fixedly installed inside the main unit 1. 310 is provided with a linear slide rail 311, which extends along the front-rear direction of the main unit 1; the inner end of the air suction nozzle 3 is connected to an air nozzle connecting seat 30, which is slidably mounted on the linear slide rail 311; a drive rack 302 is fixedly mounted on the side of the air nozzle connecting seat 30, and the drive rack 302 is parallel to the linear slide rail 311; a drive motor 304 is fixedly mounted on the side of the linear slide rail 311, and a drive gear 3 is mounted on the output shaft of the drive motor 304. 03. The drive gear 303 meshes with the drive rack 302 to drive the air nozzle connector 30 and the suction nozzle 3 to reciprocate along the linear slide rail 311. The air nozzle connector 30 has a first position switch 305 on its front side and a second position switch 306 on its rear side. The control circuit is electrically connected to the heat sealing assembly, the drive motor 304, the first position switch 305, and the second position switch 306. The air nozzle connector 30 is triggered by the first position switch 305 and the second position switch 306. When the air nozzle connector 30 moves forward and triggers the first position switch 305, the first position switch 305 sends an electrical signal to the control circuit. The control circuit controls the drive motor 304 to stop running, and the suction nozzle 3 extends to the front side of the pressure bag assembly. When the air nozzle connector 30 moves backward and triggers the second position switch 306, the second position switch 306 sends an electrical signal to the control circuit. The control circuit controls the drive motor 304 to stop running, and the suction nozzle 3 moves backward to the rear side of the heat sealing assembly.

[0026] The reciprocating motion of the suction nozzle 3 is driven by a precision transmission mechanism consisting of a drive motor 304, a drive gear 303, and a drive rack 302, replacing the traditional pneumatic drive method. This structure has advantages such as high transmission accuracy, fast response speed, accurate positioning, stable operation, and long service life. It effectively solves the problems of positioning deviation, easy seal damage, and slow response that exist in pneumatic drives, and is particularly suitable for high-speed continuous packaging operations.

[0027] By setting a first position switch 305 and a second position switch 306, and triggering them in conjunction with the nozzle connector 30, precise electronic control of the extension and retraction positions of the suction nozzle 3 is achieved. The control circuit can accurately control the start and stop of the drive motor according to the position signal, thereby ensuring that the suction nozzle 3 is accurately positioned during the vacuuming and heat sealing processes, improving the automation level and reliability of the equipment operation.

[0028] Specifically, the air nozzle connector 30 has a connecting cavity inside, and the rear end of the air extraction nozzle 3 is airtightly inserted into the connecting cavity; the side of the air nozzle connector 30 is provided with an air extraction connector 301, which connects to the connecting cavity, and the air extraction connector 301 is connected to a negative pressure air extraction device through an air pipe, which is located inside the main unit 1.

[0029] Specifically, the negative pressure air extraction device includes an air pump 5 and a water vapor separation box 4. The air pump 5 is provided with an air inlet 51 and an air outlet 52; the water vapor separation box 4 is provided with a water vapor inlet 411 and a drying outlet 421; the air extraction nozzle 3 is connected to the water vapor inlet 411 through an air pipe, the drying outlet 421 is connected to the air inlet 51 of the air pump 5 through another air pipe, and the air outlet 52 of the air pump 5 is connected to the outside atmosphere through another air pipe.

[0030] Specifically, the interior of the water vapor separator 4 is provided with a water storage chamber 40. The bottom of the water storage chamber 40 is provided with a water vapor inlet pipe 41 and a drying outlet pipe 42. The water vapor inlet pipe 41 and the drying outlet pipe 42 extend out of the exterior of the water vapor separator 4, forming a water vapor inlet 411 and a drying outlet 421, respectively. The top ends of the water vapor inlet pipe 41 and the drying outlet pipe 42 extend upward to a position close to the top of the water storage chamber 40, and a water-liquid separation gap is left between the water vapor inlet pipe 41 and the drying outlet pipe 42.

[0031] Specifically, the water vapor separator 4 is fixedly installed on the main unit 1. Its top is open and forms a water tank opening. A water tank cover 43 is provided at the water tank opening. There is an inverted airtight connection structure between the water tank opening and the water tank cover 43, including a buckle 401 formed on the inner side of the water tank opening and an inverted hook ring 431 formed on the bottom edge of the water tank cover 43. The cross-sectional shape of the buckle 401 and the inverted hook ring 431 is respectively set in the shape of the letter "L". The inverted hook ring 431 is fastened to the inner side of the buckle 401. A groove is formed between the buckle 401 and the water tank opening. A sealing ring is provided in the groove. The sealing ring fits tightly with the bottom surface of the water tank cover 43 to form an airtight structure.

[0032] The negative pressure suction device integrates a water vapor separator 4, which effectively separates and stores water vapor introduced during the suction process, preventing water vapor from entering the suction pump and causing damage, thus extending the service life of the suction pump 5. The water vapor separator 4 adopts an inverted, airtight connection structure, facilitating disassembly and cleaning of the water storage chamber and simplifying maintenance. A liquid level sensor is included to promptly detect when the water level is full and automatically shut down the device, providing safety protection.

[0033] The working principle of the water vapor separator 4 is as follows: It utilizes the change in the flow rate of humid air within the separator 4, and the gas undergoes a sharp turn through the water tank cover 43 located above the water vapor inlet pipe 41. Larger water droplets adhere to the bottom surface of the water tank cover 43, thus achieving gas-liquid separation. The liquid water is collected in the water storage chamber 40, while the dry gas is discharged through the drying outlet pipe 42. This mechanical separation method eliminates the need for filter replacement, is highly efficient, and has low maintenance costs; only periodic emptying of the accumulated water is required.

[0034] Specifically, the main unit 1 is equipped with an air outlet connector 6 inside, and an exhaust port 60 is provided on the upper part of the air outlet connector 6. The exhaust port 60 is exposed on the surface of the main unit 1. The air outlet connector 6 is connected to the exhaust port 60 of the air pump 5 through an air pipe. A liquid level sensor 61 is also connected in series in the air pipe between the air outlet connector 6 and the air pump 5. The liquid level sensor 61 is electrically connected to the control circuit. When the liquid level sensor 61 detects water, the liquid level sensor 61 sends an electrical signal to the control circuit, and the control circuit controls the sealing machine to stop running.

[0035] The discharge pipe connected to the liquid level sensor 61 can detect whether there is water in the discharged air. If water is detected, it means that the water storage chamber 40 in the water vapor separator 4 is full of water and the water vapor inlet pipe 41 and the drying outlet pipe 42 are submerged, causing the water separation function of the water vapor separator 4 to fail. At this time, the water in the water storage chamber 40 should be poured out.

[0036] Specifically, a bag-cutting device 9 is provided on the rear side of the main unit 1. The bag-cutting device 9 includes a bag-cutting bracket that is flipped and installed on the main unit 1, and a scraper that is slidably installed on the bag-cutting bracket. A cutting clearance groove is formed on the rear surface of the main unit 1. When the bag-cutting bracket is flipped and closed on the main unit 1, the bag-cutting bracket and the surface of the main unit 1 clamp the bag. At the same time, the sliding trajectory of the scraper coincides with the cutting clearance groove.

[0037] Specifically, the bag pressing assembly includes an upper bag pressing strip 21 and a lower bag pressing strip 12 made of rubber. The upper bag pressing strip 21 and the lower bag pressing strip 12 are respectively fixed to the bag pressing mating surface of the flap 2 and the sealing part 11. The heat sealing assembly includes a high-temperature resistant pressing strip 22 and a heating wire 13. The high-temperature resistant pressing strip 22 is located on the inner side of the flap 2, and the heating wire 13 is located on the sealing part 11 and is electrically connected to the control circuit.

[0038] Specifically, the bottom of the main unit 1 has a recessed groove for winding, and winding brackets are provided on both sides of the groove for winding and storing the power cord.

[0039] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A sealing machine for flat bags, comprising a control circuit, a main unit (1), and a flip cover (2), the flip cover (2) being mounted on the front side of the main unit (1) via a rotating shaft, the front side of the main unit (1) having a sealing part (11), the flip cover (2) being flipped and pressed against the sealing part (11), the front side of the sealing part (11) having a bag pressing assembly and the rear side having a heat sealing assembly, and a suction nozzle (3) being movably provided in the middle position of the main unit (1), the outer end of the suction nozzle (3) being movably passed through the bag pressing assembly and the heat sealing assembly, characterized in that: A slide (310) is fixedly installed inside the main unit (1). The slide (310) is provided with a linear slide rail (311), which extends along the front and rear direction of the main unit (1). An air nozzle connector (30) is connected to the inner end of the air nozzle (3), and the air nozzle connector (30) is slidably installed on the linear slide rail (311). Among them, a drive rack (302) is fixedly installed on the side of the air nozzle connector (30), and the drive rack (302) is parallel to the linear slide rail (311); a drive motor (304) is fixedly installed on the side of the linear slide rail (311), and a drive gear (303) is installed on the output shaft of the drive motor (304). The drive gear (303) meshes with the drive rack (302) to drive the air nozzle connector (30) and the air suction nozzle (3) to reciprocate along the linear slide rail (311); The air nozzle connector (30) has a first position switch (305) on the front side and a second position switch (306) on the rear side. The control circuit is electrically connected to the heat sealing assembly, the drive motor (304), the first position switch (305), and the second position switch (306). The nozzle connector (30) is triggered and engaged with the first position switch (305) and the second position switch (306) respectively. When the nozzle connector (30) moves forward and triggers the first position switch (305), the first position switch (305) sends an electrical signal to the control circuit, and the control circuit controls the drive motor (304) to stop running, and the suction nozzle (3) extends to the front side of the pressure bag assembly. When the nozzle connector (30) moves backward and triggers the second position switch (306), the second position switch (306) sends an electrical signal to the control circuit, and the control circuit controls the drive motor (304) to stop running, and the suction nozzle (3) moves backward to the rear side of the heat sealing assembly.

2. The sealing machine for flat bags according to claim 1, characterized in that: The air nozzle connector (30) has a connecting cavity inside, and the rear end of the air suction nozzle (3) is airtightly inserted into the connecting cavity; the side of the air nozzle connector (30) is provided with an air suction connector (301), which connects to the connecting cavity. The air suction connector (301) is connected to a negative pressure air suction device through an air pipe, and the negative pressure air suction device is located inside the main unit (1).

3. A sealing machine for flat bags according to claim 2, characterized in that: The negative pressure air extraction device includes an air pump (5) and a water vapor separator (4). The air pump (5) is provided with an air inlet (51) and an air outlet (52). The water vapor separator (4) is provided with a water vapor inlet (411) and a drying outlet (421). The air extraction nozzle (3) is connected to the water vapor inlet (411) through an air pipe. The drying outlet (421) is connected to the air inlet (51) of the air pump (5) through another air pipe. The air outlet (52) of the air pump (5) is connected to the outside atmosphere through another air pipe.

4. A sealing machine for flat bags according to claim 3, characterized in that: The water vapor separator (4) is provided with a water storage chamber (40) inside. The bottom of the water storage chamber (40) is provided with a water vapor input pipe (41) and a drying output pipe (42). The water vapor input pipe (41) and the drying output pipe (42) extend out of the water vapor separator (4) respectively, and form the water vapor inlet (411) and the drying outlet (421) respectively. The top of the water vapor input pipe (41) and the drying output pipe (42) extend upward to a position close to the top of the water storage chamber (40). A water-liquid separation interval is left between the water vapor input pipe (41) and the drying output pipe (42).

5. A sealing machine for flat bags according to claim 4, characterized in that: The water vapor separator (4) is fixedly installed on the host (1), with its top open and forming a water tank opening. A water tank cover (43) is provided at the water tank opening with an airtight cover. Among them, an inverted airtight connection structure is provided between the water tank opening and the water tank cover (43), including a buckle (401) formed on the inner side of the water tank opening and an inverted hook ring (431) formed on the bottom edge of the water tank cover (43). The cross-sectional shape of the buckle (401) and the inverted hook ring (431) is respectively set in the shape of the letter "L". The inverted hook ring (431) is fastened to the inner side of the buckle (401). A groove is formed between the buckle (401) and the water tank opening. A sealing ring is provided in the groove. The sealing ring is tightly fitted with the bottom surface of the water tank cover (43) to form an airtight structure.

6. A sealing machine for flat bags according to claim 5, characterized in that: The host (1) is provided with an air outlet connector (6) inside. The upper part of the air outlet connector (6) is provided with an exhaust port (60). The exhaust port (60) is exposed on the surface of the host (1). The air outlet connector (6) is connected to the exhaust port (60) of the air pump (5) through an air pipe. Among them, a liquid level sensor (61) is connected in series with the air pipe between the air outlet connector (6) and the air pump (5). The liquid level sensor (61) is electrically connected to the control circuit. When the liquid level sensor (61) detects water, the liquid level sensor (61) sends an electrical signal to the control circuit, and the control circuit controls the sealing machine to stop running.

7. A sealing machine for flat bags according to claim 1, characterized in that: The rear side of the main unit (1) is provided with a bag cutting device (9). The bag cutting device (9) includes a bag cutting bracket that is flipped and installed on the main unit (1) and a scraper that is slidably installed on the bag cutting bracket. The rear surface of the main unit (1) is formed with a cutting clearance groove. When the bag cutting bracket is flipped and closed on the main unit (1), the bag cutting bracket and the surface of the main unit (1) clamp the bag. At the same time, the sliding trajectory of the scraper coincides with the cutting clearance groove.

8. A sealing machine for flat bags according to claim 1, characterized in that: The bag pressing assembly includes an upper bag pressing strip (21) and a lower bag pressing strip (12) made of rubber. The upper bag pressing strip (21) and the lower bag pressing strip (12) are respectively fixed to the bag pressing mating surface of the flap (2) and the sealing part (11). The heat sealing assembly includes a high temperature resistant pressing strip (22) and a heating wire (13). The high temperature resistant pressing strip (22) is located on the inner side of the flap (2), and the heating wire (13) is located on the sealing part (11) and electrically connected to the control circuit.

9. A sealing machine for flat bags according to claim 1, characterized in that: The bottom of the host (1) is recessed to form a winding groove, and winding brackets are provided on both sides of the winding groove for winding and storing the power cord.

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