A memory alloy based RFID padlock

Abstract

The application discloses an RFID padlock based on a memory alloy, which comprises a lock body shell and a lock beam, the inside of the lock body shell is provided with a box body, one end of the lock beam extends into the lock body shell and penetrates through the box body, a lock opening spring is arranged between the box body and the lock beam and is sleeved on the lock beam, the lower side of the box body is provided with a clamping spring clamped on the end of the lock beam, the other end of the lock beam is provided with a lock head, the other side of the box body is provided with a mounting plate fixedly arranged in the inside of the lock body shell, the mounting plate is provided with a rotary lock capable of being rotated to open the lock and matched with the lock head, the lock opening speed is fast, the time from power-on to lock opening is not more than 400 ms, the conventional motor control usually takes about 2-4 s, the service life is long, the service frequency can be more than 10000 times, the volume is small, and only the memory alloy wire and the current limiting resistor are needed for the lock opening related structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of RFID padlocks, in particular to a RFID padlock based on memory alloy. BACKGROUND

[0002] The RFID electronic lock is made of high-temperature flame-retardant modified ABS engineering plastic, and has high strength, acid and alkali corrosion resistance and impact resistance.

[0003] The RFID electronic lock in the related art, i.e. the RFID padlock, still has some aspects that can be improved and optimized.

[0004] 1. Driven by a motor, the cost is high, and needs to be improved;

[0005] 2. The number of unlocking times is more than 2000, and the number is not enough, and needs to be optimized;

[0006] 3. The unlocking time is 2-4s, and the unlocking is not fast enough, and needs to be improved.

[0007] Accordingly, the present application provides a RFID padlock based on memory alloy, which is faster, longer in service life and lower in cost. SUMMARY

[0008] In order to overcome the defects in the prior art, the present application provides a RFID padlock based on memory alloy, which is driven by a memory alloy to drive the movement of the lock hook to realize opening and closing, and the cost is only about one sixth of the cost of a conventional motor structure, the unlocking speed is fast, the time from power-on to unlocking is not more than 400ms, the service life is long, and the number of uses can exceed 10000 times.

[0009] TECHNICAL SCHEME

[0010] A RFID padlock based on memory alloy, comprising a lock body shell and a lock beam, a box body is arranged in the inside of the lock body shell, one end of the lock beam extends into the lock body shell and penetrates through the box body, an unlocking spring is arranged between the box body and the lock beam and is sleeved on the lock beam inside the box body, a clamping spring is arranged on the lower side of the box body and clamped on the end of the lock beam, a lock head is arranged on the other end of the lock beam, an installation plate is arranged on the other side of the box body and fixed in the inside of the lock body shell, a rotary lock capable of rotating and unlocking and matched with the lock head is arranged on the installation plate, a memory metal wire for rotating and unlocking is wound on the rotary lock, a control circuit board is further arranged in the inside of the lock body shell, and the memory metal wire is connected to the circuit by the control circuit board.

[0011] Further, a lock core fixing base is fixed on the mounting plate, a spring back is arranged at the center of the lock core fixing base, the rotary lock is rotatably connected to the upper side of the lock core fixing base, a torsion spring is fixedly connected between the rotary lock and the lock core fixing base, a fixed column is further arranged on the upper side of the rotary lock, a fixer is arranged on the mounting plate, one end of the memory wire is fixed to the fixer, and the other end of the memory wire is fixed to the fixed column after passing around the rotary lock.

[0012] Further, a lock hole is arranged in the upper surface of the rotary lock, an extrusion groove is arranged on the inner wall of the lock hole, and a limiting part capable of being clamped into the extrusion groove and driving the rotary lock to rotate and achieving locking is further arranged on the lock head.

[0013] Further, a cover plate is arranged at the bottom of the lock head, an identification chip is arranged in the lock head, an identification chip contact is arranged on the outer surface of the lock head, and an identification contact adapted to the identification chip contact is further arranged in the rotary lock.

[0014] Further, a stopper is further arranged on the rotary lock, a limiter is arranged on the mounting plate, and the stopper can be blocked by the limiter so as to limit the maximum rotation angle of the rotary lock.

[0015] Further, the memory wire is connected to the control circuit board through a first connecting line, and the identification chip is connected to the control circuit board through a second connecting line.

[0016] Further, a magnetic power supply interface is further arranged on the lock body shell.

[0017] Further, a signal feedback structure is further arranged on the lock body shell, and the signal feedback structure is started when the control circuit board identifies that the identification chip contact and the identification contact are not matched.

[0018] Further, the memory wire is made of a nickel-titanium memory alloy, and a double-path memory effect is used, that is, the shape of the high-temperature phase change is restored when heated, and the shape of the low-temperature phase change is restored when cooled.

[0019] Further, the control circuit board comprises a main control circuit, a power management circuit, an RFID control circuit and a lock core control circuit.

[0020] Further, the diameter of the lower end of the lock head is equal to the diameter of the lock hole, and the distance between the two limiting parts is greater than the diameter of the lock hole.

[0021] Beneficial effects

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. The unlocking speed is fast, from power-on to unlocking, no more than 400 ms, and the time of conventional motor control is usually about 2-4 s;

[0024] 2. Long service life, more than 10000 times;

[0025] 3. Small size, only memory wire and current limiting resistor are used for unlocking related structure;

[0026] 4. Low power consumption, low driving voltage of memory wire, and usually short power-on time, lower power consumption;

[0027] 5. Low cost, memory wire scheme is only about one sixth of the cost of conventional motor structure;

[0028] 6. Waterproof, not easy to rust. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structure schematic diagram of an RFID padlock based on a memory alloy;

[0030] Figure 2 It is an explosion structure schematic diagram of the application;

[0031] Figure 3 It is an explosion structure schematic diagram of the rotating lock;

[0032] Figure 4 It is a structure schematic diagram of the rotating lock.

[0033] REFERENCE NUMERALS

[0034] Lock body shell 1, control circuit board 2, magnetic power supply interface 3, second connecting wire 4, first connecting wire 5, lock beam 6, lock head 7, memory wire 8, unlocking spring 9, snap spring 10, rotating lock 11, extrusion groove 12, lock hole 13, stop block 14, mounting plate 15, fixator 16, fixed column 17, limiter 18, limiting part 19, identification contact 20, lock core fixed base 21, rebounder 22, torsional spring 23, identification chip 24, identification chip contact 25, cover plate 26, box body 27. DETAILED DESCRIPTION

[0035] To better illustrate the content of the application, the following will be combined with the drawings and examples to explain:

[0036] There are Figures 1-4The application discloses a memory alloy-based RFID padlock, which comprises a lock body shell 1 and a lock beam 6, the inside of the lock body shell 1 is provided with a box body 27, one end of the lock beam 6 extends into the lock body shell 1 and penetrates through the box body 27, a lock opening spring 9 is arranged between the box body 27 and the lock beam 6 and is sleeved on the lock beam 6, the lower side of the box body 27 is provided with a clamping spring 10 clamped on the end of the lock beam 6, the other end of the lock beam 6 is provided with a lock head 7, the other side of the box body 27 is provided with a mounting plate 15 fixedly arranged in the inside of the lock body shell 1, the mounting plate 15 is provided with a rotary lock 11 capable of being rotated to open the lock and matched with the lock head 7, a memory metal wire 8 for rotating to open the lock is wound on the rotary lock 11, and the inside of the lock body shell 1 is further provided with a control circuit board 2, the memory metal wire 8 is connected to the control circuit board 2.

[0037] Further, the mounting plate 15 is fixedly provided with a lock core fixing base 21, a rebounder 22 is arranged at the center of the lock core fixing base 21, the rotary lock 11 is rotationally connected to the upper side of the lock core fixing base 21, a torsion spring 23 is fixedly connected between the rotary lock 11 and the lock core fixing base 21, the upper side of the rotary lock 11 is further provided with a fixing column 17, the mounting plate 15 is provided with a fixer 16, one end of the memory metal wire 8 is fixedly arranged on the fixer 16, and the other end of the memory metal wire 8 is fixedly arranged on the fixing column 17 after passing through the rotary lock 11.

[0038] Further, the upper surface of the rotary lock 11 is provided with a lock hole 13, the inner wall of the lock hole 13 is provided with an extrusion groove 12, the lock head 7 is further provided with a limiting part 19 capable of being clamped into the extrusion groove 12 and driving the rotary lock 11 to rotate and realize locking.

[0039] Further, the bottom of the lock head 7 is provided with a cover plate 26, the inside of the lock head 7 is provided with an identification chip 24, the outer surface of the lock head 7 is provided with an identification chip contact 25, and the inside of the rotary lock 11 is further provided with an identification contact 20 matched with the identification chip contact 25.

[0040] Further, the rotary lock is further provided with a stop block 14, the mounting plate 15 is provided with a limiter 18, and the stop block 14 can be blocked by the limiter 18 so as to limit the maximum rotation angle of the rotary lock 11.

[0041] Further, the memory metal wire 8 is connected to the control circuit board 2 through a first connecting line 5, and the identification chip 24 is connected to the control circuit board 2 through a second connecting line 4.

[0042] Further, the lock body shell 1 is further provided with a magnetic power supply interface 3.

[0043] Further, the lock body shell 1 is also provided with a signal feedback structure (not shown), which is activated when the control circuit board 2 identifies that the identification chip contact 25 does not match the identification contact 20.

[0044] Further, the memory wire 8 is made of nickel-titanium memory alloy, which uses double memory effect, that is, the shape of high-temperature phase change is restored when heated, and the shape of low-temperature phase change is restored when cooled.

[0045] Further, the control circuit board 2 comprises a main control circuit, a power management circuit, an RFID control circuit and a lock core control circuit.

[0046] Further, the lower end of the lock head 7 has a diameter approximately equal to that of the lock hole 13, and the distance between the two limiting portions 19 is greater than the diameter of the lock hole 13.

[0047] Specifically, the initial state is set to be the locked state, the unlocking spring 9 is compressed, the lowermost end of the lock beam 6 and the clamping spring 10 are located at the lowermost side, and the clamping spring 10 does not contact the box body 27.

[0048] The control circuit board 2 is composed of a main control circuit, a power management circuit, an RFID control circuit and a lock core control circuit. An external power supply supplies power to the control circuit board 2 through the magnetic power supply interface 3, and after passing through the power management circuit, it supplies power to other circuits.

[0049] When unlocking, the RFID control circuit receives an unlocking signal and transmits the signal to the main control circuit, which controls the lock core control circuit to open the electronic padlock.

[0050] The opening process is as follows: the magnetic power supply interface 3 supplies power, the RFID control circuit receives an unlocking instruction, the memory wire 8 is electrified and heated at this time, thereby rapidly shrinking and pulling the rotating lock 11 to rotate, at this time the torsion spring 23 is energized, when rotated to a certain angle, the rotating lock 11 no longer restricts the lock head 7, so that the lock head 7 is ejected under the elastic force of the rebounder 22, at the same time the unlocking spring 9 lifts the lock beam 6 upwards, and the lock head 7 moves upwards, realizing the unlocking operation, and the rotating lock 11 simultaneously rotates under the elastic force of the torsion spring 23.

[0051] At this time, the clamping spring 10 abuts against the lower surface of the box body 27.

[0052] The user can read the historical unlocking information of unlocking and locking through the RFID reader and writer.

[0053] When the lock head 7 is inserted into the lock hole 13, the limiting part 19 is inserted into the extrusion groove 12, and the rotating lock 11 is rotated through the inclined extrusion groove 12, and the torsion spring 23 is energized until the limiting part 19 is inserted into the lock hole 13 and penetrates the extrusion groove 12, and the limiting part 19 is no longer limited by the extrusion groove 12, and the rotating lock 11 is rotated under the elastic force of the torsion spring 23, and the limiting part 19 is clamped by the inner wall of the lock hole 13, and at the same time, the lock head 7 is inserted, the spring 22 is compressed and energized, so that the lock head 7 can be ejected when the lock is opened;

[0054] At the same time of insertion, the unlocking spring 9 is also continuously compressed, so that the lock beam 6 can be ejected when the lock is opened;

[0055] When the lock is normally locked, the identification chip contact 25 will contact the identification contact 20, and the control circuit board 2 identifies whether the lock head 7 is normally locked, so as to judge whether the lock is correctly locked, and if the identification chip 24 is not matched, the seal lock will issue a warning through the signal feedback structure;

[0056] After the lock is opened, the current stops, the memory wire 8 slowly restores to the original state, the torsion spring 23 drives the memory wire 8 to slowly reset, the rotating lock 11 is returned to normal, and after the lock is successfully opened, the electronic padlock can be powered off.

[0057] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the technical solutions of the present application are described in detail with reference to the foregoing examples, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing examples, or replace some technical features thereof with equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A memory alloy based RFID padlock, characterized by: The utility model provides a lock body shell (1) and lock beam (6) including, the inside of lock body shell (1) is provided with box (27), one end of lock beam (6) enters lock body shell (1) and is penetrated through box (27), the box (27) with lock beam (6) between being provided with the inside of box (27) and the sleeve of lock beam (6) open lock spring (9), the lower side of box (27) is provided with the snap spring (10) of clamping in lock beam (6) end, the other end of lock beam (6) is provided with lock head (7), the other side of box (27) is provided with the mounting plate (15) of being fixed in the inside of lock body shell (1), the mounting plate (15) is provided with the rotatory lock (11) of being able to rotate and open lock and with lock head (7) adaptation, the rotatory lock (11) is wound with the memory wire (8) for rotating and opening lock, the inside of lock body shell (1) is further provided with control circuit board (2), control circuit board (2) will memory wire (8) access circuit; The mounting plate (15) is fixed with a lock cylinder fixing base (21), a return spring (22) is arranged at the center of the lock cylinder fixing base (21), the rotatory lock (11) is rotatably connected to the upper side of the lock cylinder fixing base (21), a torsion spring (23) is fixedly connected between the rotatory lock (11) and the lock cylinder fixing base (21), a fixed column (17) is further arranged on the upper side of the rotatory lock (11), a fixer (16) is arranged on the mounting plate (15), one end of the memory wire (8) is fixed to the fixer (16), and the other end of the memory wire (8) is fixed to the fixed column (17) after passing through the rotatory lock (11); A lock hole (13) is arranged in the upper surface of the rotatory lock (11), an extrusion groove (12) is arranged on the inner wall of the lock hole (13), a limiting part (19) is further arranged on the lock head (7) and can be clamped into the extrusion groove (12) to drive the rotatory lock (11) to rotate and realize locking; A cover plate (26) is arranged on the bottom of the lock head (7), an identification chip (24) is arranged in the lock head (7), an identification chip contact (25) is arranged on the outer surface of the lock head (7), and an identification contact (20) is further arranged in the rotatory lock (11) and matched with the identification chip contact (25); A stop block (14) is further arranged on the rotatory lock (11), a limiter (18) is arranged on the mounting plate (15), and the stop block (14) can be blocked by the limiter (18) to limit the maximum rotation angle of the rotatory lock (11).

2. A shape memory alloy based RFID padlock according to claim 1, characterized in that: The memory wire (8) is connected to the control circuit board (2) through a first connecting line (5), and the identification chip (24) is connected to the control circuit board (2) through a second connecting line (4).

3. A shape memory alloy based RFID padlock according to claim 2, characterized in that: A magnetic power supply interface (3) is further arranged on the lock body shell (1).

4. A shape memory alloy based RFID padlock according to claim 3, characterized in that: The lock body shell (1) is further provided with a signal feedback structure, when the control circuit board (2) identifies that the identification chip contact (25) and the identification contact (20) are not matched, the signal feedback structure is started.

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