Shielding door limiting device of RFID scanning equipment

Abstract

The invention belongs to the technical field of information identification, particularly relates to an RFID scanning equipment shielding door limiting device, and provides the following scheme aiming at the problems that an existing limiting device is complex in structure and high in cost, and equipment purchasing and using burdens are increased for some small enterprises or users with strict cost control. A rolling frame is rotationally connected into the support, electromagnetic shielding cloth is fixedly wound on the rolling frame, and a horizontal rotating shaft is fixedly installed in the rolling frame. When the RFID scanning equipment sends out a door opening / closing instruction, the driving motor rotates through the horizontal rotating shaft and the unwinding shaft to drive the electromagnetic shielding cloth of the shielding door to ascend and descend; when the electromagnetic shielding cloth of the shielding door arrives at a designated position and the positioning triggering device on the indexing adjusting gear triggers the microswitch, the driving motor can be controlled to stop, so that the electromagnetic shielding cloth can be stably limited, and good practicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of information recognition, and particularly to a limit device for a shielding door of an RFID scanning device. Background Art

[0002] In modern logistics, warehousing, manufacturing and other industries, RFID technology is widely used in the identification and management of goods. When an RFID scanning device is working, it is necessary to ensure stable signals in the scanning area without external interference, and at the same time ensure the accurate opening and closing of the shielding door to achieve efficient and accurate goods detection and data collection. The limit device of the present invention is designed to meet this requirement, aiming to improve the control accuracy and reliability of the shielding door of the RFID scanning device, thereby enhancing the performance of the entire RFID system, enabling it to operate more stably and efficiently in industrial production, logistics distribution and other links, which is of great significance for ensuring the accurate acquisition of goods information and the normal operation of the system, occupying a key position in the relevant technical fields, and providing strong support for realizing intelligent and automated production and management.

[0003] Currently, there are many problems with the limit of the shielding door of existing RFID scanning devices during use. In the traditional metal door shielding method, after being used for a period of time, due to metal fatigue, gaps are likely to appear in the door body, resulting in radio frequency signal leakage and thus misreading phenomena, seriously affecting the accuracy and reliability of the RFID scanning device. For example, in the goods management of a logistics warehouse, an RFID scanning device with a metal shielding door may misread the goods label information due to signal leakage, causing deviations in inventory data and further affecting the efficient operation of the entire logistics distribution process.

[0004] For the common belt rolling shutter door shielding method, although it solves some problems of the metal door to a certain extent, the belt travel is prone to deviation, and the motor driving the belt is also more likely to fail. Once a failure occurs, it will not only affect the normal opening and closing of the shielding door, but may also cause the device to stop, increasing the maintenance cost and time cost and reducing the production efficiency. For example, on a production line, if the belt rolling shutter door of an RFID scanning device fails, the goods detection link will be blocked, causing the production line to stagnate and bringing economic losses to the enterprise.

[0005] In addition, some existing limit devices have complex structures and high costs, which increase the burden of equipment procurement and use for some small enterprises or users with strict cost control. Moreover, the complex structure also makes the maintenance and repair of the device more difficult. Once a failure occurs, it takes professional technicians a long time to troubleshoot and repair, further affecting the normal use of the device. Therefore, we propose a limit device for a shielding door of an RFID scanning device to solve the above-mentioned problems. Summary of the Invention

[0006] An object of the present invention is to solve the disadvantages that the existing limit device has a complex structure and high cost, which increases the burden of equipment procurement and use for some small enterprises or users with strict cost control, and to propose a limit device for the shielding door of an RFID scanning device.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A limit device for the shielding door of an RFID scanning device includes a bracket, a winding frame is rotatably connected inside the bracket, an electromagnetic shielding cloth is fixedly wound on the winding frame, a horizontal rotating shaft is fixedly installed inside the winding frame, one end of the horizontal rotating shaft extends to the outside of the bracket, and a rotating shaft gear located outside the bracket is fixedly sleeved on the horizontal rotating shaft. The limit device further includes: A limit mechanism is installed on one side of the bracket, and the limit mechanism is in transmission cooperation with the rotating shaft gear; A guiding mechanism is matched with the electromagnetic shielding cloth, and the guiding mechanism is used to guide the electromagnetic shielding cloth.

[0008] In a possible design, the limit mechanism includes a main support shaft rotatably connected to one side of the bracket, a main indexing gear is fixedly sleeved on the main support shaft, the main indexing gear is meshed with the rotating shaft gear, a main gear positioning trigger shaft is installed at an eccentric position on one side of the main indexing gear, a main limit microswitch is fixedly installed on one side of the bracket, the main gear positioning trigger shaft is matched with the main limit microswitch, and the main limit microswitch is electrically connected to the driving motor.

[0009] In a possible design, the limit mechanism further includes a backup limit mechanism. The backup limit mechanism includes a backup support shaft rotatably connected to one side of the bracket, a backup indexing gear is fixedly sleeved on the backup support shaft, the backup indexing gear is meshed with the rotating shaft gear, a backup gear positioning trigger shaft is installed at an eccentric position on one side of the backup indexing gear, a backup limit microswitch is fixedly installed on one side of the bracket, the backup gear positioning trigger shaft is matched with the backup limit microswitch, and the backup limit microswitch is electrically connected to the driving motor.

[0010] In a possible design, the guiding mechanism includes two guide rails. Both sides of the electromagnetic shielding cloth extend into the two guide rails respectively. A bottom beam is fixedly installed at the bottom of the electromagnetic shielding cloth, and both ends of the bottom beam extend into the two guide rails respectively and are slidably matched with the inner walls of the two guide rails.

[0011] In a possible design, two first docking covers are symmetrically and fixedly installed at the bottom of the bottom beam and are respectively located in the two guide rails. A second docking cover is fixedly installed on the inner wall of the bottom of the guide rail, and the first docking cover is connected to the corresponding second docking cover.

[0012] In a possible design, a first magnet is fixedly installed on the inner wall of the top of the first docking cover, and a second magnet is fixedly installed on the inner wall of the bottom of the second docking cover. The first magnet and the second magnet are movably attracted to each other.

[0013] In a possible design, two support wheels are rotatably installed on one inner wall of the guide rail. The two support wheels are respectively located on both sides of the electromagnetic shielding cloth and are respectively in contact with both sides of the electromagnetic shielding cloth. The support wheels are used to support and limit the electromagnetic shielding cloth.

[0014] In a possible design, a driving motor is fixedly installed on one inner wall of the bracket, and the output shaft of the driving motor is fixedly connected to the other end of the horizontal rotating shaft.

[0015] In this application, during use, when the driving motor is started to drive the horizontal rotating shaft to rotate, the winding frame can be driven to rotate at this time, so as to realize the winding or unwinding of the electromagnetic shielding cloth. When the horizontal rotating shaft rotates, the rotating shaft gear can be driven to rotate. At this time, under the meshing transmission with the main indexing gear, the main gear positioning trigger shaft can be driven to perform an arc-shaped movement. And when the main gear positioning trigger shaft is in contact with the main limit microswitch for transmission, the main limit microswitch can be triggered to move, so as to send a working instruction to the driving motor to stop the driving motor. And the backup indexing gear and the rotating shaft gear are set to remain meshed, so that after the winding or unwinding of the electromagnetic shielding cloth is completed, the backup gear positioning trigger shaft and the backup limit microswitch can be used in the same way to cooperate to send a working instruction to the driving motor to stop the driving motor, so as to ensure the limitation of the electromagnetic shielding cloth. When the electromagnetic shielding cloth is unwound, the bottom beam will move downward along the two guide rails until the first docking cover is inserted into the corresponding second docking cover. At this time, the top of the second magnet will be located in the first docking cover and will be attracted to the first magnet, so as to realize the limitation of the bottom beam and further limit the electromagnetic shielding cloth to keep it in a flat state.

[0016] Beneficial effects: In the present invention, for the RFID scanning device shielding door limiting device, through the limiting mechanism, the driving motor can be started to drive the horizontal rotating shaft to rotate. At this time, the winding frame can be driven to rotate, so as to realize the winding or unwinding of the electromagnetic shielding cloth. When the horizontal rotating shaft rotates, the rotating shaft gear can be driven to rotate. At this time, under the meshing transmission with the main indexing gear, the main gear positioning trigger shaft can be driven to perform an arc-shaped movement. And when the main gear positioning trigger shaft is in contact with the main limit microswitch for transmission, the main limit microswitch can be triggered to move, so as to send a working instruction to the driving motor to stop the driving motor. In the present invention, for the limit device of the shielding door of the RFID scanning device, through the guiding mechanism, two guide rails can be slidably connected to the bottom beam, enabling the electromagnetic shielding cloth to remain flat when being wound or unwound. When the RFID scanning device issues an opening / closing instruction in the present invention, the driving motor rotates through the horizontal rotating shaft and the winding shaft, driving the electromagnetic shielding cloth of the shielding door to rise and fall. When the electromagnetic shielding cloth of the shielding door reaches the specified position and the positioning trigger device on the indexing adjustment gear triggers the microswitch, the driving motor can be controlled to stop. Therefore, stable limiting of the electromagnetic shielding cloth can be achieved, which has good practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of a limit device for the shielding door of an RFID scanning device proposed by the present invention; Figure 2 It is a front view structural schematic diagram of a limit device for the shielding door of an RFID scanning device proposed by the present invention; Figure 3 It is a three-dimensional schematic diagram of the connection structure of the bracket, driving motor and horizontal rotating shaft of a limit device for the shielding door of an RFID scanning device proposed by the present invention; Figure 4 It is a three-dimensional schematic diagram of the connection structure of the indexing gear, rotating shaft gear and backup indexing gear of a limit device for the shielding door of an RFID scanning device proposed by the present invention; Figure 5 It is a three-dimensional schematic diagram of the connection structure of two guide rails and the electromagnetic shielding cloth of a limit device for the shielding door of an RFID scanning device proposed by the present invention; Figure 6 It is a three-dimensional schematic diagram of the connection structure of the guide rail and two support wheels of a limit device for the shielding door of an RFID scanning device proposed by the present invention; Figure 7 It is a three-dimensional schematic diagram of the sectional separation structure of the first docking cover and the second docking cover of a limit device for the shielding door of an RFID scanning device proposed by the present invention; Figures 8 - 11 It is a three-dimensional schematic diagram of the main indexing gear structure of a limit device for the shielding door of an RFID scanning device proposed by the present invention.

[0018] In the figure: 1. Bracket; 2. Rewinding frame; 21. Horizontal rotating shaft; 22. Rotating shaft gear; 3. Limiting mechanism; 31. Main support shaft; 32. Main indexing gear; 33. Main gear positioning trigger shaft; 34. Main limit microswitch; 4. Backup limiting mechanism; 41. Backup support shaft; 42. Backup indexing gear; 43. Backup gear positioning trigger shaft; 44. Backup limit microswitch; 5. Electromagnetic shielding cloth; 51. Bottom beam; 6. Guide rail; 61. Support wheel; 62. First docking cover; 63. Second docking cover; 64. First magnet; 65. Second magnet; 7. Driving motor. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] Embodiment 1: Refer to Figures 1 - 4 , a limiting device, the main body of which is composed of a bracket 1, and a rotatably connected rewinding frame 2 is designed inside the bracket 1. The electromagnetic shielding cloth 5 is tightly wound on the rewinding frame 2 to shield the RFID scanning area when needed to prevent interference. Inside the rewinding frame 2, a horizontal rotating shaft 21 is fixedly installed, and one end of it extends outside the bracket 1, and a rotating shaft gear 22 is fixedly sleeved at this end for transmission cooperation with an external mechanism.

[0021] On one inner wall of the bracket 1, a driving motor 7 is fixedly installed, and the output shaft of it is tightly connected to the other end of the horizontal rotating shaft 21 to ensure stable power transmission.

[0022] Next is the design of the limiting mechanism 3, which is installed on one side of the bracket 1 and is in transmission cooperation with the rotating shaft gear 22. The limiting mechanism 3 is mainly composed of a main support shaft 31, and a main indexing gear 32 is fixedly sleeved on the main support shaft 31, and this gear meshes precisely with the rotating shaft gear 22. At an eccentric position on one side of the main indexing gear 32, a main gear positioning trigger shaft 33 is fixedly installed. At the same time, on one side of the bracket 1, a main limit microswitch 34 is fixedly installed, which cooperates with the main gear positioning trigger shaft 33 and is electrically connected to the driving motor 7.

[0023] When the driving motor 7 is started, it drives the horizontal rotating shaft 21 to rotate, and then drives the rewinding frame 2 to rotate to realize the winding or unwinding of the electromagnetic shielding cloth 5. During the rotation of the horizontal rotating shaft 21, the rotating shaft gear 22 also rotates accordingly, and drives the main gear positioning trigger shaft 33 to perform an arc-shaped movement through meshing transmission with the main indexing gear 32. When the main gear positioning trigger shaft 33 contacts the main limit microswitch 34, it triggers the main limit microswitch 34, and then sends a stop working instruction to the driving motor 7 to realize the limiting function.

[0024] To ensure the reliability of the limit, we also designed a backup limit mechanism 4. It mainly consists of a backup support shaft 41, on which a backup indexing gear 42 is fixedly sleeved, and this gear also meshes precisely with the rotating shaft gear 22. At an eccentric position on one side of the backup indexing gear 42, we fixedly installed a backup gear positioning trigger shaft 43. Meanwhile, on one side of the bracket 1, we fixedly installed a backup limit microswitch 44, which cooperates with the backup gear positioning trigger shaft 43 and is electrically connected to the drive motor 7.

[0025] When the electromagnetic shielding cloth 5 finishes winding or unwinding, the backup gear positioning trigger shaft 43 will contact the backup limit microswitch 44, triggering it to send an instruction to the drive motor 7 to stop working, ensuring the limit of the electromagnetic shielding cloth 5.

[0026] The working principle of the limit microswitch 34 and the backup limit microswitch 44 is based on an external mechanical force acting on the action reed through transmission elements (such as push pins, buttons, levers, rollers, etc.). When the displacement of the action reed reaches the critical point, an instantaneous action will occur, causing the moving contact at the end of the action reed to quickly connect or disconnect from the fixed contact. When the force on the transmission element is removed, the action reed will generate a reverse acting force, and after the reverse stroke of the transmission element reaches the action critical point of the reed, an instantaneous reverse action will be completed.

[0027] This application can be used in the field of information recognition technology and also in other fields applicable to this application.

[0028] Embodiment 2: Refer to Figures 5 - 7 , and on the basis of Embodiment 1, an improvement is made: A limit device for the shielding door of an RFID scanning device, which is applied to the field of information recognition technology. We also designed a guiding mechanism to guide the electromagnetic shielding cloth 5. This mechanism mainly consists of two guide rails 6, and both sides of the electromagnetic shielding cloth 5 extend into the two guide rails 6 respectively. At the bottom of the electromagnetic shielding cloth 5, we fixedly installed a bottom beam 51, and both ends of the bottom beam 51 extend into the two guide rails 6 respectively and are slidably matched with the inner walls of the guide rails 6, ensuring the flatness of the electromagnetic shielding cloth 5 during the winding or unwinding process.

[0029] At the bottom of the bottom beam 51, we symmetrically and fixedly installed two first docking covers 62, which are respectively located within the two guide rails 6. At the same time, on the inner wall of the bottom of the guide rail 6, we fixedly installed a second docking cover 63. On the inner wall of the top of the first docking cover 62, we fixedly installed a first magnet 64, and on the inner wall of the bottom of the second docking cover 63, we fixedly installed a second magnet 65. When the electromagnetic shielding cloth 5 is unrolled, the bottom beam 51 will move downward along the guide rail 6 until the first docking cover 62 is inserted into the second docking cover 63. At this time, the first magnet 64 and the second magnet 65 will attract each other to achieve the limit of the bottom beam 51 and further ensure the flatness of the electromagnetic shielding cloth 5.

[0030] On one inner wall of the guide rail 6, we rotated two supporting wheels 61, which are respectively located on both sides of the electromagnetic shielding cloth 5 and are in close contact with both sides of the electromagnetic shielding cloth 5. The supporting wheels 61 are used to support and limit the electromagnetic shielding cloth 5 to prevent it from being scratched by the guide rail 6 during movement.

[0031] However, as is well known to those skilled in the art, the working principle and wiring method of the drive motor 7 are common knowledge, and they both belong to conventional means or well-known common sense, so they will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0032] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An RFID scanning device shielding door limit device, comprising a bracket (1), a winding frame (2) is rotatably connected inside the bracket (1), an electromagnetic shielding cloth (5) is fixedly wound on the winding frame (2), a horizontal rotating shaft (21) is fixedly installed inside the winding frame (2), one end of the horizontal rotating shaft (21) extends to the outside of the bracket (1), and a rotating shaft gear (22) located outside the bracket (1) is fixedly sleeved on the horizontal rotating shaft (21), characterized in that, The limiting device further includes: a limiting mechanism (3), which is installed on one side of the bracket (1), and the limiting mechanism (3) is in transmission cooperation with the rotating shaft gear (22); a guiding mechanism, which is in cooperation with the electromagnetic shielding cloth (5), and the guiding mechanism is used to guide the electromagnetic shielding cloth (5).

2. The limit device for the shielding door of an RFID scanning device according to claim 1, characterized in that, The limiting mechanism (3) includes a main support shaft (31) rotatably connected to one side of the bracket (1). A main indexing gear (32) is fixedly sleeved on the main support shaft (31). The main indexing gear (32) meshes with the rotating shaft gear (22). A main gear positioning trigger shaft (33) is installed at an eccentric position on one side of the main indexing gear (32). A main limit microswitch (34) is fixedly installed on one side of the bracket (1). The main gear positioning trigger shaft (33) cooperates with the main limit microswitch (34), and the main limit microswitch (34) is electrically connected to the driving motor (7).

3. The RFID scanning device shielding door limit device according to claim 2, characterized in that, The limiting mechanism (3) further includes a backup limiting mechanism (4). The backup limiting mechanism (4) includes a backup support shaft (41) rotatably connected to one side of the bracket (1). A backup indexing gear (42) is fixedly sleeved on the backup support shaft (41). The backup indexing gear (42) meshes with the rotating shaft gear (22). A backup gear positioning trigger shaft (43) is installed at an eccentric position on one side of the backup indexing gear (42). A backup limit microswitch (44) is fixedly installed on one side of the bracket (1). The backup gear positioning trigger shaft (43) cooperates with the backup limit microswitch (44), and the backup limit microswitch (44) is electrically connected to the driving motor (7).

4. The limit device for the shielding door of an RFID scanning device according to claim 1, wherein The guiding mechanism includes two guide rails (6). Both sides of the electromagnetic shielding cloth (5) extend into the two guide rails (6) respectively. A bottom beam (51) is fixedly installed at the bottom of the electromagnetic shielding cloth (5). Both ends of the bottom beam (51) extend into the two guide rails (6) respectively and are in sliding cooperation with the inner walls of the two guide rails (6).

5. The limiting device for the shielding door of an RFID scanning device according to claim 4, characterized in that, Two first docking covers (62) are symmetrically and fixedly installed at the bottom of the bottom beam (51) and are respectively located in the two guide rails (6). A second docking cover (63) is fixedly installed on the bottom inner wall of the guide rail (6). The first docking cover (62) is connected to the corresponding second docking cover (63).

6. The limit device for the shielding door of an RFID scanning device according to claim 5, characterized in that, A first magnet (64) is fixedly installed on the top inner wall of the first docking cover (62), and a second magnet (65) is fixedly installed on the bottom inner wall of the second docking cover (63). The first magnet (64) and the second magnet (65) are movably attracted to each other.

7. The limit device for the shielding door of an RFID scanning device according to claim 3, wherein Two support wheels (61) are rotatably installed on one inner wall of the guide rail (6). The two support wheels (61) are respectively located on both sides of the electromagnetic shielding cloth (5) and are respectively in contact with both sides of the electromagnetic shielding cloth (5). The support wheels (61) are used to support and limit the electromagnetic shielding cloth (5).

8. The limit device for the shielding door of an RFID scanning device according to claim 1, characterized in that, A driving motor (7) is fixedly installed on one inner wall of the bracket (1). The output shaft of the driving motor (7) is fixedly connected to the other end of the horizontal rotating shaft (21).

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