Anti-falling locking device for roller shutter door

Abstract

The utility model belongs to the field of roller shutter doors, and particularly discloses an anti-falling locking device for a roller shutter door, which is characterized in that a programmable industrial control board is respectively and electrically connected with a low-position magnetic induction travel switch, a high-position magnetic induction travel switch and a rotary driving mechanism to obtain induction signals of the low-position magnetic induction travel switch and the high-position magnetic induction travel switch to a magnet; when the roller shutter door descends, the rotary baffle is driven by the rotary driving mechanism to rotate in the forward direction to block the roller shutter door, and when the roller shutter door descends, the rotary baffle is driven by the rotary driving mechanism to rotate in the reverse direction to be pulled back from the lower portion of the roller shutter door. Automatic locking and unlocking functions in the lifting process of the roller shutter door are achieved, manual operation is not needed, the operation process is simplified, working efficiency is improved, and potential safety hazards are avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of roller shutter door, concretely relates to a roller shutter door anti-falling locking device. BACKGROUND

[0002] At present, the electric roller shutter door installed in the port warehouse needs to be installed with the manual safety locking device after the lifting of the roller shutter door according to the highest safety level requirement, and the device can prevent the safety accidents caused by the sudden falling of the roller shutter door to the maximum. But the following problems are found in use: first, the manual locking and unlocking operation procedures are increased, causing the cumbersome and inconvenient work; second, when the roller shutter door is closed by using the remote control, the damage or damage of the roller shutter door and the DC motor will be caused if the unlocking is forgotten; third, when the operating personnel manually lock and unlock at the roller shutter door, the safety hidden danger of the falling of the roller shutter door still exists. SUMMARY

[0003] In order to solve the above problems, the utility model provides a roller shutter door anti-falling locking device, realizes the automatic locking and unlocking function in the lifting process of the roller shutter door, does not need manual operation, simplifies the operation process, improves the work efficiency and avoids the safety hidden danger.

[0004] The technical scheme of the utility model is as follows: a roller shutter door anti-falling locking device, including low position magnetic induction travel switch, high position magnetic induction travel switch, magnet, programmable industrial control board, rotating mechanism with rotating baffle, rotating drive mechanism;

[0005] The magnet is arranged on the side of the roller shutter door, and the installation position of the high position magnetic induction travel switch is higher than that of the low position magnetic induction travel switch; the rotating mechanism and the rotating drive mechanism are at least provided with one set and are installed on the side wall of the roller shutter door; the rotating drive mechanism is connected with the rotating baffle;

[0006] The programmable industrial control board is electrically connected with the low position magnetic induction travel switch, the high position magnetic induction travel switch and the rotating drive mechanism respectively, obtains the induction signals of the magnet of the low position magnetic induction travel switch and the high position magnetic induction travel switch, drives the rotating baffle to rotate forward and block below the roller shutter door when the roller shutter door rises through the rotating drive mechanism, and drives the rotating baffle to rotate reversely and pull back from below the roller shutter door when the roller shutter door falls through the rotating drive mechanism.

[0007] In an optional embodiment, the rotating mechanism includes a bottom plate and a supporting plate, the bottom plate is installed on the side wall of the roller shutter door, the supporting plate is installed on the bottom plate and is perpendicular to the bottom plate, and the rotating baffle is connected with the supporting plate through a rotating shaft.

[0008] In an optional embodiment, the rotating mechanism further includes at least one reinforcing plate, and the reinforcing plate is arranged between the bottom end of the supporting plate and the bottom plate.

[0009] In an alternative embodiment, the upper side of the rotating baffle is provided with a groove for clamping the rolling shutter door.

[0010] In an alternative embodiment, the rotating drive mechanism comprises a DC motor, a DC motor drive circuit and an L-shaped connecting piece, the programmable industrial control board is electrically connected with the DC motor through the DC motor drive circuit, one end of the L-shaped connecting piece is connected with the output shaft of the DC motor, and the other end is connected with the rotating baffle, and the DC motor is arranged on the bottom plate.

[0011] In an alternative embodiment, the DC motor drive circuit comprises a relay KM, a forward rotation limit switch SQ1, a reverse rotation limit switch SQ2, a diode D1, a diode D2, a diode D3 and a diode D4.

[0012] The first end of the coil of the relay KM is connected with the positive pole of the power supply, and the second end is connected with the Y1 pin of the programmable industrial control board;

[0013] The first normally closed static contact and the second normally open static contact of the relay KM are connected with the positive pole of the power supply, the first normally open static contact is connected with the second normally closed static contact, and the second normally closed static contact is connected with the Y0 pin of the programmable industrial control board;

[0014] The first moving contact of the relay KM is connected with the XCom1 pin of the programmable industrial control board through the forward rotation limit switch SQ1 in one way, and is connected with the negative pole of the diode D3 in the other way, the control end of the forward rotation limit switch SQ1 is connected with the X0 pin of the programmable industrial control board, and the positive pole of the diode D3 is connected with the XCom1 pin of the programmable industrial control board;

[0015] The second moving contact of the relay KM is connected with one end of the DC motor, and the other end of the DC motor is connected with the XCom1 pin of the programmable industrial control board through the reverse rotation limit switch SQ2 in one way, and is connected with the negative pole of the diode D4 in the other way, the control end of the reverse rotation limit switch SQ2 is connected with the X1 pin of the programmable industrial control board, and the positive pole of the diode D4 is connected with the XCom1 pin of the programmable industrial control board;

[0016] The positive pole of the diode D1 is connected with the second end of the coil of the relay KM, and the negative pole is connected with the positive pole of the power supply;

[0017] The positive pole of the diode D2 is connected with the second normally closed static contact of the relay KM, and the negative pole is connected with the second end of the coil of the relay KM.

[0018] In an alternative embodiment, the DC motor drive circuit further comprises a forward rotation indicating lamp LD and a reverse rotation indicating lamp LY, one end of the forward rotation indicating lamp LD is connected with the positive pole of the power supply, and the other end is connected with the Y0 pin of the programmable industrial control board, one end of the reverse rotation indicating lamp LY is connected with the positive pole of the power supply, and the other end is connected with the Y1 pin of the programmable industrial control board.

[0019] In an alternative embodiment, the Y2 pin of the programmable industrial control board is connected to the incoming terminal of the roller shutter door downward stop switch, the YCom2 pin is connected to the outgoing terminal of the roller shutter door downward stop switch, and the Y3 pin is connected to the fault lamp LD.

[0020] In an alternative embodiment, a set of rotating mechanism and rotating drive mechanism are arranged on each side wall of the roller shutter door.

[0021] In an alternative embodiment, the device further comprises a waterproof machine box, the low-position magnetic induction travel switch and the high-position magnetic induction travel switch are mounted on the shell of the waterproof machine box, and the programmable industrial control board is arranged in the waterproof machine box.

[0022] The roller shutter door anti-falling locking device has the following beneficial effects compared with the prior art: the high-position and low-position magnetic induction travel switches are arranged to detect the magnet signal, so as to determine the lifting and falling state, after lifting, the rotating drive mechanism is used to control the rotating baffle to rotate to the lower side of the roller shutter door, so that the roller shutter door is prevented from falling, automatic locking is realized, and when the roller shutter door falls, the rotating drive mechanism is used to control the rotating baffle to be pulled back, so that automatic unlocking is realized. The automatic locking and unlocking functions during the lifting and falling of the roller shutter door are realized, manual operation is not needed, the operation process is simplified, the work efficiency is improved, and safety hazards are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0024] Figure 1 is a principle structure schematic diagram of a roller shutter door anti-falling locking device provided by the embodiment of the present application.

[0025] Figure 2 is a rotating mechanism structure schematic diagram.

[0026] Figure 3 is a direct current motor drive circuit schematic diagram.

[0027] Figure 4 is a roller shutter door locking schematic diagram.

[0028] In the drawings, 1 is a programmable industrial control board, 2 is a high-position magnetic induction travel switch, 3 is a low-position magnetic induction travel switch, 4 is a rotating drive mechanism, 41 is a direct current motor, 42 is an L-shaped connecting piece, 5 is a rotating mechanism, 51 is a rotating baffle, 511 is a groove, 52 is a bottom plate, 53 is a rotating shaft, 54 is a supporting plate, 55 is a reinforcing plate, 6 is a roller shutter door, and 7 is a magnet. DETAILED DESCRIPTION

[0029] The utility model will be described in detail below in combination with the drawings and through specific embodiments. The following embodiments are an explanation of the utility model, and the utility model is not limited to the following embodiments.

[0030] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0031] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0032] As shown in FIG. 1, the roller shutter door anti-falling locking device provided by the embodiment comprises a low-position magnetic induction travel switch 3, a high-position magnetic induction travel switch 2, a magnet 7, a programmable industrial control board 1, a rotating mechanism 5 with a rotating baffle 51, and a rotating driving mechanism 4. Figure 1 As shown in FIG. 1, the magnet 7 is arranged at the side of the roller shutter door 6. The installation position of the high-position magnetic induction travel switch 2 is higher than that of the low-position magnetic induction travel switch 3. When the roller shutter door 6 is controlled (wall switch or remote control) to rise and fall, the corresponding position and state of the roller shutter door 6 are collected by the magnetic induction travel switch, and the signal is transmitted to the programmable industrial control board 1.

[0033] Figure 4 The rotating mechanism 5 and the rotating driving mechanism 4 are at least provided in one set and are installed on the side wall of the roller shutter door 6; the rotating driving mechanism 4 is connected with the rotating baffle 51. In an alternative embodiment, one set of rotating mechanism 5 and rotating driving mechanism 4 are arranged on the side walls of the roller shutter door 6. Figure 4

[0034] The rotating mechanism 5 and the rotating driving mechanism 4 are at least provided in one set and are installed on the side wall of the roller shutter door 6; the rotating driving mechanism 4 is connected with the rotating baffle 51. In an alternative embodiment, one set of rotating mechanism 5 and rotating driving mechanism 4 are arranged on the side walls of the roller shutter door 6.

[0035] The programmable industrial control board 1 is electrically connected with the low magnetic induction travel switch 3, the high magnetic induction travel switch 2 and the rotating driving mechanism 4 respectively, obtains the sensing signals of the low magnetic induction travel switch 3 and the high magnetic induction travel switch 2 to the magnet 7, drives the rotating baffle 51 to rotate forward and block under the roller shutter door 6 when the roller shutter door 6 rises, drives the rotating baffle 51 to rotate reversely and pull back from under the roller shutter door 6 when the roller shutter door 6 falls. In an optional embodiment, the rotating baffle 51 can rotate 90 degrees. When the roller shutter door 6 rises from the low position to the high position, the low magnetic induction travel switch 3 first senses and memorizes that the roller shutter door 6 is in the low position, the roller shutter door 6 continues to rise to the position of the high magnetic induction travel switch 2, and then the programmable industrial control board 1 outputs an electric signal to drive the rotating baffle 51 to rotate forward and block under the roller shutter door 6 by the rotating driving mechanism 4, and enters the locking state (as shown in Figure 4 , the rotating baffle 51 is located directly below the roller shutter door 6, perpendicular to the falling direction of the roller shutter door 6, and prevents the roller shutter door 6 from falling, thereby playing a protection role). When the roller shutter door 6 falls from the high position to the low position, after obtaining the downward action signal of the DC motor 41, the high magnetic induction switch first senses and memorizes that the roller shutter door 6 is in the high position and runs downward, the roller shutter door 6 continues to fall to the position of the low magnetic induction travel switch 3, and then the programmable industrial control board 1 outputs an electric signal to drive the rotating baffle 51 to rotate reversely and pull back from under the roller shutter door 6 by the rotating driving mechanism 4, and enters the unlocking state.

[0036] As shown in Figure 2 , the rotating mechanism 5 of the embodiment includes a bottom plate 52 and a support plate 54, the bottom plate 52 is installed on the side wall of the roller shutter door 6, the support plate 54 is installed on the bottom plate 52 and is perpendicular to the bottom plate 52, and the rotating baffle 51 is connected with the support plate 54 through a rotating shaft 53. In order to improve the firmness, the rotating mechanism 5 further includes at least one reinforcing plate 55, which is arranged between the bottom end of the support plate 54 and the bottom plate 52. The upper side of the rotating baffle 51 of the embodiment is provided with a groove 511 for clamping the roller shutter door 6, the roller shutter door 6 is clamped through the groove 511, and the stability is improved.

[0037] The rotating baffle 51 is controlled to rotate by the rotating driving mechanism 4 in the embodiment, the rotating driving mechanism 4 of the embodiment includes a DC motor 41, a DC motor 41 driving circuit and an L-shaped connecting piece 42, the programmable industrial control board 1 is electrically connected with the DC motor 41 through the DC motor 41 driving circuit, one end of the L-shaped connecting piece 42 is connected with the output shaft of the DC motor 41, and the other end is connected with the rotating baffle 51, and the DC motor 41 is arranged on the bottom plate 52.

[0038] As shown in Figure 3As shown, the direct current motor 41 driving circuit of the embodiment includes a relay KM, a forward rotation limit switch SQ1, a reverse rotation limit switch SQ2, a diode D1, a diode D2, a diode D3, and a diode D4.

[0039] The first end of the coil of the relay KM is connected to the positive pole of the power supply, and the second end is connected to the Y1 pin of the programmable industrial control board 1; the first normally closed static contact and the second normally open static contact of the relay KM are respectively connected to the positive pole of the power supply, the first normally open static contact is connected to the second normally closed static contact, and the second normally closed static contact is connected to the Y0 pin of the programmable industrial control board 1; the first moving contact of the relay KM is connected to the normally closed end of the forward rotation limit switch SQ1 in one way and to the negative pole of the diode D3 in another way; the normally open end of the forward rotation limit switch SQ1 is connected to the X0 pin of the programmable industrial control board 1, and the common end of the forward rotation limit switch SQ1 and the positive pole of the diode D3 are respectively connected to the XCom1 pin of the programmable industrial control board 1; the second moving contact of the relay KM is connected to one end of the direct current motor 41, and the other end of the direct current motor 41 is connected to the normally closed end of the reverse rotation limit switch SQ2 in one way and to the negative pole of the diode D4 in another way; the normally open end of the reverse rotation limit switch SQ2 is connected to the X1 pin of the programmable industrial control board 1, and the common end of the reverse rotation limit switch SQ2 and the positive pole of the diode D4 are respectively connected to the XCom1 pin of the programmable industrial control board 1; the positive pole of the diode D1 is connected to the second end of the coil of the relay KM, and the negative pole is connected to the positive pole of the power supply; the positive pole of the diode D2 is connected to the second normally closed static contact of the relay KM, and the negative pole is connected to the second end of the coil of the relay KM.

[0040] In order to realize forward rotation and reverse rotation indication, the direct current motor 41 driving circuit further includes a forward rotation indication lamp LD and a reverse rotation indication lamp LY, one end of the forward rotation indication lamp LD is connected to the positive pole of the power supply, the other end is connected to the Y0 pin of the programmable industrial control board 1, one end of the reverse rotation indication lamp LY is connected to the positive pole of the power supply, and the other end is connected to the Y1 pin of the programmable industrial control board 1.

[0041] In the embodiment, the high-position magnetic induction travel switch 2 is connected to the X2 pin of the programmable industrial control board 1, and the low-position magnetic induction travel switch 3 is connected to the X3 pin of the programmable industrial control board 1, and at the same time, the low-position magnetic induction travel switch 3 and the high-position magnetic induction travel switch 2 are both connected to the common end XCom0 pin of the programmable industrial control board 1.

[0042] Circuit working principle: D1, D2, D3, and D4 are isolation diodes, MD is a direct current motor 41, the limit switches connected to X0 and X1 are the forward and reverse rotation limits of the 90-degree rotating mechanical device direct current motor 41. X2 and X3 are the travel switches of the roller shutter door 6. The circuit is divided into the following two states.

[0043] State 1, when the rolling door 6 is lifted from the low position to the high position, through X2, at this time the programmable industrial control board 1 senses and remembers that the rolling door 6 is in the low position state, and the rolling door 6 continues to rise to X3, the program interlock is defined as: the rolling door 6 state from the low position to the high position, the industrial control board outputs the low potential of Y0, at this time two circuits are formed: the first circuit is that the positive pole of the 12v power supply returns to the negative pole of the power supply Y0 through the green light, at this time the green light LD is bright, indicating that the direct current motor 41 is in the positive rotation process; the second circuit is that the positive pole of the 12v power supply passes through the B point through the moving break point of the relay (at this time the relay is in the power-off state), then passes through the C point to the moving break point of the X0 limit switch, then passes through D4 and the direct current motor 41, and then goes to the H point of the relay, then passes through the moving break point inside the relay (at this time the relay is in the power-off state), and then returns to the negative pole Y0 of the power supply, at this time the direct current motor 41 is powered and rotates positively, driving the 90-degree rotating mechanical device into the locking state, when the direct current motor 41 rotates to the 90-degree position, the X0 limit switch acts, on the one hand cutting off the circuit of the direct current motor 41, the direct current motor 41 stops rotating, on the other hand the industrial control board inputs X0 receives the limit switch action instruction, the program resets Y0, and the output Y0 signal is ended, the signal light green light is extinguished, and the locking action of the locking device is completed.

[0044] State 2, when the rolling door 6 is lowered from the high position to the low position, the program interlock of the industrial control board is defined as: after obtaining the lower action signal of the direct current motor 41, X3 senses and remembers that the rolling door 6 is in the high position to the low position state, the industrial control board outputs the low potential of Y1, at this time three circuits are formed: the first circuit is that the positive pole of the 12v power supply returns to the negative pole of the power supply Y1 through the yellow light, at this time the yellow light LY is bright, indicating that the direct current motor 41 is in the reverse rotation process; the second circuit is that the positive pole of the 12v power supply passes through the A point through the relay coil to the G point, and then returns to the negative pole Y1 of the power supply, at this time the relay is in the attracted state; the third circuit is that the positive pole of the 12v power supply passes through the I point into the relay through the moving contact point of the relay (the relay is in the attracted state), comes out from the H point through the direct current motor 41, then passes through the moving break point of the X1 limit switch, passes through D3 into the relay through the moving contact point of the relay, then passes through D2 and returns to the negative end Y1 of the power supply, at this time the direct current motor 41 is powered and reverses, driving the 90-degree rotating mechanical device into the unlocking state, when the direct current motor 41 rotates to the 90-degree position, the X1 limit switch acts, on the one hand cutting off the circuit of the direct current motor 41, the direct current motor 41 stops rotating, on the other hand the industrial control board inputs X1 receives the limit switch action instruction, the program resets Y1, and the output Y1 signal is ended, the signal light yellow light is extinguished, and the unlocking action of the locking device is completed.

[0045] In the embodiment, the X4 pin and the X5 pin of the programmable industrial control board 1 can be connected to the positive and negative rotation limit of another direct current motor 41. Table 1 is the input and output port wiring of the programmable industrial control board 1.

[0046] Table 1: Input and output port wiring of programmable industrial control board 1

[0047]

[0048] In this embodiment, to improve the running safety and increase safety guarantee measures, the Y2 pin of the programmable industrial control board 1 is connected to the incoming line end of the down stop switch of the roller shutter door 6, the YCom2 pin is connected to the outgoing line end of the down stop switch of the roller shutter door 6, and the Y3 pin is connected to the fault light LD.

[0049] In an optional embodiment, when X3 is sensed in the high position downward running state, the program performs 7-second timing. If the unlocking limit does not act within 7 seconds (the one-way action time of the rotating baffle 51 is 6 seconds), it is considered that the rotating mechanical device is faulty, and Y2 and Y3 are output. The role of Y2 is to stop the roller shutter door 6 from continuing to descend, and the role of Y3 is to make the red light LR (fault) bright. When the program checks that the unlocking limit switch of the rotating mechanical device is unlocked, the roller shutter door 6 can continue to descend, X2 is sensed, the program is memorized as the roller shutter door 6 entering the low position state and being kept until the state 1 is repeated again.

[0050] In an optional embodiment, in order to ensure the continuous effectiveness of the X3 sensing signal, when X3 is sensed during the upward running of the roller shutter door 6, the program outputs Y2 action, disconnects the downward DC motor 41 action loop of the roller shutter door 6, and stops the downward control of the roller shutter door 6.

[0051] In an optional embodiment, in order to prevent the roller shutter door 6 from rising to the limit, during the time period after the roller shutter door 6 anti-falling locking device rises and locks, the roller shutter door 6 anti-falling locking device fails due to various reasons (such as internal connection line power failure, power module damage, industrial control board damage, etc.), causing the locking device to be unable to unlock, and causing the normal downward of the roller shutter door 6 to be blocked. The output Y2 at the normal time is set to be normally closed. Once the above failure event occurs, the industrial control board stops working at the same time, Y2 is powered off, the downward loop power supply of the DC motor 41 of the roller shutter door 6 is disconnected, and the safety of the equipment is ensured.

[0052] In an optional embodiment, the programmable industrial control board 1 can be an FX2N-10MR industrial control board. In an optional embodiment, the device includes an ABS engineering plastic waterproof machine box, the box cover is provided with a waterproof rubber ring, which can ensure outdoor waterproof operation. All components are placed inside, among which the roller shutter door 6 magnetic induction travel switch is installed on the side of the machine box, the roller shutter door 6 is provided with a magnet 7 at the corresponding position, and the punching installation position is all treated with sealing glue to prevent water and leakage.

[0053] The above disclosed is only the preferred embodiment of the present application, but the present application is not limited to this, any non-creative change and some improvement and decoration made without departing from the principle of the present application by any person skilled in the art should fall within the protection scope of the present application.

Claims

1. A roll shutter door anti-drop locking device, characterized in that, The application relates to a rotating mechanism for a roller shutter door. The magnet is arranged on the side of the roller shutter door, the installation position of the high-position magnetic induction travel switch is higher than that of the low-position magnetic induction travel switch, at least one set of the rotating mechanism and the rotating driving mechanism is arranged on the side wall of the roller shutter door, and the rotating driving mechanism is connected with the rotating baffle. The programmable industrial control board is electrically connected with the low-position magnetic induction travel switch, the high-position magnetic induction travel switch and the rotating driving mechanism, the sensing signals of the low-position magnetic induction travel switch and the high-position magnetic induction travel switch to the magnet are acquired, the rotating baffle is driven to rotate forward and stop under the roller shutter door through the rotating driving mechanism when the roller shutter door rises, and the rotating baffle is driven to rotate reversely and pull back from under the roller shutter door through the rotating driving mechanism when the roller shutter door falls.

2. A drop down blocking device for a roller shutter door according to claim 1, characterised in that, The rotating mechanism comprises a bottom plate and a supporting plate, the bottom plate is arranged on the side wall of the roller shutter door, the supporting plate is arranged on the bottom plate and is perpendicular to the bottom plate, and the rotating baffle is connected with the supporting plate through a rotating shaft.

3. A drop down blocking device for a roller shutter door as claimed in claim 2 wherein, The rotating mechanism further comprises at least one reinforcing plate arranged between the bottom end of the supporting plate and the bottom plate.

4. A drop down blocking device for a roller shutter door according to claim 2 or 3, characterised in that, The upper side of the rotating baffle is provided with a groove for clamping the roller shutter door.

5. A drop down blocking device for a roller shutter door as claimed in claim 2 or 3 wherein, The rotating driving mechanism comprises a DC motor, a DC motor driving circuit and an L-shaped connecting piece, the programmable industrial control board is electrically connected with the DC motor through the DC motor driving circuit, one end of the L-shaped connecting piece is connected with the output shaft of the DC motor, the other end is connected with the rotating baffle, and the DC motor is arranged on the bottom plate.

6. A drop down blocking device for a roller door as claimed in claim 5 wherein, The DC motor driving circuit comprises a relay KM, a forward rotation limit switch SQ1, a reverse rotation limit switch SQ2, diodes D1, D2, D3 and D4. The first end of the coil of the relay KM is connected with the positive electrode of the power supply, and the second end is connected with the Y1 pin of the programmable industrial control board. The first normally closed static contact and the second normally open static contact of the relay KM are connected with the positive electrode of the power supply, the first normally open static contact is connected with the second normally closed static contact, and the second normally closed static contact is connected with the Y0 pin of the programmable industrial control board. The first moving contact of the relay KM is connected with the normally closed end of the forward rotation limit switch SQ1 in one way and with the negative electrode of the diode D3 in the other way, the normally open end of the forward rotation limit switch SQ1 is connected with the X0 pin of the programmable industrial control board, and the common end of the forward rotation limit switch SQ1 and the positive electrode of the diode D3 are connected with the XCom1 pin of the programmable industrial control board. The second moving contact of the relay KM is connected with one end of the DC motor, the other end of the DC motor is connected with the normally closed end of the reverse rotation limit switch SQ2 in one way and with the negative electrode of the diode D4 in the other way, the normally open end of the reverse rotation limit switch SQ2 is connected with the X1 pin of the programmable industrial control board, and the common end of the reverse rotation limit switch SQ2 and the positive electrode of the diode D4 are connected with the XCom1 pin of the programmable industrial control board. The positive electrode of the diode D1 is connected with the second end of the coil of the relay KM, and the negative electrode is connected with the positive electrode of the power supply. The positive electrode of the diode D2 is connected with the second normally closed static contact of the relay KM, and the negative electrode is connected with the second end of the coil of the relay KM.

7. A drop down blocking device for a roller door as claimed in claim 6 wherein, The direct current motor driving circuit further comprises a forward rotation indicating lamp LD and a reverse rotation indicating lamp LY, one end of the forward rotation indicating lamp LD is connected with a positive pole of a power supply, and the other end is connected with a Y0 pin of the programmable industrial control board, one end of the reverse rotation indicating lamp LY is connected with the positive pole of the power supply, and the other end is connected with a Y1 pin of the programmable industrial control board.

8. A drop down blocking device for a roller door as claimed in claim 7 wherein, A Y2 pin of the programmable industrial control board is connected with an incoming line end of a roller shutter door downward stop switch, a YCom2 pin is connected with an outgoing line end of the roller shutter door downward stop switch, and a Y3 pin is connected with a fault lamp LD.

9. The drop down prevention closure for a roller door according to claim 1 wherein, One set of rotating mechanism and rotating driving mechanism is arranged on each of the two side walls of the roller shutter door.

10. The drop down blocking device for a rolling door according to claim 1, wherein, The device further comprises a waterproof machine box, a low-position magnetic induction travel switch and a high-position magnetic induction travel switch are mounted on an outer shell of the waterproof machine box, and the programmable industrial control board is arranged in the waterproof machine box.

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