阅读说明：本技术 一种计算机科学控制开关门装置 (Computer science control door opening and closing device ) 是由 李波林 付希尧 于 2021-01-28 设计创作，主要内容包括：本发明公开了一种计算机科学控制开关门装置,其结构包括：衬片扣座、衔铁电磁架块、配电插槽筒、电磁阀挡板、中控继电器,本发明实现了运用衔铁电磁架块与配电插槽筒相配合,通过引脚插接板与电缆线束筒在衔铁滑板槽右侧电位导线对接电磁架轮盘与衔铁滑板槽形成一个复合式接近开关触发电磁吸附引力增幅的操作效果,让后续的计算机科学控制通过电缆线束筒让程序锁去对接机械锁的三相交流电引脚插接板形成快速插接防尘密封操作效果,也让对接的内电路与磁力锁形成机械联动操作,让衔铁滑板槽得到自动门开关的闭锁一体化调控操作效果,保护磁力活性也降低损耗,提升电磁感增幅量。(The invention discloses a computer science control door opening and closing device, the structure of which comprises: the invention realizes the operation effect that the armature electromagnetic frame block is matched with the power distribution slot cylinder, a combined proximity switch is formed by connecting a potential lead on the right side of an armature sliding plate groove with a current lead wire of a pin plugboard and a cable bundle cylinder and connecting an electromagnetic frame wheel disc and the armature sliding plate groove to trigger electromagnetic adsorption attraction amplification, so that the subsequent computer science controls that a program is locked to a three-phase alternating current pin plugboard of a butt mechanical lock through the cable bundle cylinder to form a quick-connection dustproof sealing operation effect, a butt-connected inner circuit and a magnetic lock form mechanical linkage operation, the armature sliding plate groove obtains a locking integrated regulation operation effect of an automatic door switch, the magnetic activity is protected, the loss is reduced, and the electromagnetic induction amplification is improved.)

1. A kind of computer science control door opening and closing device, its structure includes: gasket knot seat (1), armature electromagnetism frame piece (2), distribution slot section of thick bamboo (3), solenoid valve baffle (4), well accuse relay (5), its characterized in that:

the armature electromagnetic frame block (2) is nested on the left side of the power distribution plug slot cylinder (3), the lining buckle base (1) is tightly attached to the bottom surface of the armature electromagnetic frame block (2), the electromagnetic valve baffle plate (4) is inserted and embedded in the rear side of the central control relay (5), the power distribution plug slot cylinder (3) is installed on the left side of the central control relay (5), and the power distribution plug slot cylinder (3) is electrically connected with the central control relay (5);

the armature electromagnetic frame block (2) is provided with an electromagnetic frame wheel disc (2A), an armature sliding plate groove (2B) and a trapezoidal end cover (2C);

electromagnetism frame rim plate (2A) are equipped with two and install respectively in the inside left and right sides in armature slide groove (2B), electromagnetism frame rim plate (2A) are connected with armature slide groove (2B) electricity, trapezoidal end housing (2C) nestification is under the bottom in armature slide groove (2B), armature slide groove (2B) nestification is in the left side of joining in marriage electric power strip groove section of thick bamboo (3).

2. The computer science controlled door opening and closing device as recited in claim 1, wherein: electromagnetism frame rim plate (2A) comprises electro-magnet fan frame (2A 1), rim plate frame seat (2A 2), electro-magnet fan frame (2A 1) is installed in the front side of rim plate frame seat (2A 2), electro-magnet fan frame (2A 1) is nested together with rim plate frame seat (2A 2).

3. The computer science controlled door opening and closing device as claimed in claim 2, wherein: electromagnet fan frame (2A 1) comprises protective tube wheel seat (2A 11), magnet fan grillage (2A 12), magnet fan grillage (2A 12) are equipped with two and install respectively in the left and right sides of protective tube wheel seat (2A 11), magnet fan grillage (2A 12) and protective tube wheel seat (2A 11) nestification are as an organic whole.

4. The computer science controlled door opening and closing device as recited in claim 1, wherein: the armature sliding plate groove (2B) is composed of an armature column plate (2B 1) and a sliding plate frame groove (2B 2), the armature column plate (2B 1) is installed inside the sliding plate frame groove (2B 2), and the armature column plate (2B 1) and the sliding plate frame groove (2B 2) are inserted and embedded together.

5. The computer science controlled door opening and closing device as recited in claim 4, wherein: armature column plate (2B 1) comprises armature cover cap frame (2B 11), electrode column plate groove (2B 12), armature cover cap frame (2B 11) is installed in the left side of electrode column plate groove (2B 12), armature cover cap frame (2B 11) and electrode column plate groove (2B 12) nestification are as an organic whole.

6. The computer science controlled door opening and closing device as recited in claim 1, wherein: the lining buckling seat (1) is composed of a buckling strip block (11) and a lining plate (12), the buckling strip block (11) is installed inside the lining plate (12), and the buckling strip block (11) is buckled with the lining plate (12) together.

7. The computer science controlled door opening and closing device of claim 6, wherein: the buckle strip block (11) is composed of a strip groove block (111) and a buckle folded plate (112), the buckle folded plate (112) is installed inside the strip groove block (111), and the buckle folded plate (112) and the strip groove block (111) are inserted and embedded together.

8. The computer science controlled door opening and closing device as recited in claim 1, wherein: the power distribution socket barrel (3) is composed of a pin insertion plate (31) and a cable harness barrel (32), the pin insertion plate (31) is installed on the left side of the cable harness barrel (32), and the pin insertion plate (31) is electrically connected with the cable harness barrel (32).

9. The computer science controlled door opening and closing device of claim 8, wherein: the pin plug board (31) is composed of three pin distributing pipes (311) and an integrated circuit board (312), the three pin distributing pipes (311) are arranged and are all installed on the right side of the integrated circuit board (312), and the pin distributing pipes (311) are embedded with the integrated circuit board (312).

Technical Field

The invention relates to a computer science control door opening and closing device, belonging to the field of computers.

Background

The computer science control needs to be programmed and combined into an integrated autonomous regulation and control program lock with four states of normally closed, normally open, semi-closed and semi-open, which is convenient for the magnetic attraction of the subsequent butt mechanical lock and the electric control regulation and control to form the closing operation efficiency of the proximity switch of the integral automatic door and the adaptation operation of the computer precision, and the defects of the prior art which are public and to be optimized are as follows:

the computer science control forms a combined program lock and mechanical lock linkage regulation and control operation effect on the locking device and the proximity switch, and the inserted electric potential butt joint operation can cause the insufficient strength of the magnet adsorption force and the armature framework strength of the automatic door switch due to electrostatic interference, so that the electromagnetic field is strong in interference, the slow switch door is movably regulated and controlled, the attraction force is insufficient, the magnetic property of the magnet is easily subjected to interference and continuous loss due to the fact that the magnetic property of the magnet is subjected to interference and the working efficiency is reduced due to the fact that the closing end of the door is subjected to hard breaking by external force.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a computer science control door opening and closing device, which aims to solve the problems that the locking device and a proximity switch are controlled by the computer science to form a combined program lock and mechanical lock linkage regulation and control operation effect, and the magnet adsorption force and armature framework strength of an automatic door switch are insufficient due to electrostatic interference in the plug-in electric potential butt joint operation, so that the electromagnetic field is strong in interference resistance, the door is slowly opened and controlled in motion, the attraction force is insufficient, and the magnetic property of a magnet is easily subjected to continuous interference loss and the working efficiency is reduced due to the fact that the door is easily and firmly closed by external force at the door closing end.

In order to achieve the purpose, the invention is realized by the following technical scheme: a kind of computer science control door opening and closing device, its structure includes: the gasket buckling seat, the armature electromagnet frame block, the power distribution groove barrel, the electromagnetic valve baffle plate and the central control relay are embedded at the left side of the power distribution groove barrel and are positioned on the same horizontal plane, the gasket buckling seat is tightly attached to the bottom surface of the armature electromagnet frame block and is positioned on the same horizontal plane, the electromagnetic valve baffle plate is embedded at the rear side of the central control relay and is perpendicular to each other, the power distribution groove barrel is installed at the left side of the central control relay and is positioned on the same horizontal plane, the power distribution groove barrel is electrically connected with the central control relay, the armature electromagnet frame block is provided with two electromagnetic frame wheel discs, an armature sliding plate groove and a trapezoidal end cover, the two electromagnetic frame wheel discs are respectively installed at the left side and the right side inside the armature sliding plate groove, the electromagnetic frame wheel discs are electrically connected with the armature sliding plate groove and are positioned on the same vertical plane, and the trapezoidal end cover is embedded at the bottom of the armature sliding plate groove and is positioned on the same vertical plane, the armature slide plate groove is nested at the left side of the power distribution plug groove barrel and is positioned on the same horizontal plane.

In order to optimize the technical scheme, the method further comprises the following steps:

as a further improvement of the invention, the electromagnetic frame wheel disc consists of an electromagnet fan frame and a wheel disc frame seat, wherein the electromagnet fan frame is arranged on the front side of the wheel disc frame seat, and the electromagnet fan frame and the wheel disc frame seat are nested together and the axes of the electromagnet fan frame and the wheel disc frame seat are collinear.

As a further improvement of the invention, the electromagnet fan frame consists of a protective tube wheel seat and two magnet fan plate frames, the two magnet fan plate frames are respectively arranged at the left side and the right side of the protective tube wheel seat, and the magnet fan plate frames and the protective tube wheel seat are nested into a whole and are positioned on the same vertical plane.

As a further improvement of the invention, the armature sliding plate groove consists of an armature column plate and a sliding plate frame groove, the armature column plate is arranged inside the sliding plate frame groove, and the armature column plate and the sliding plate frame groove are inserted and embedded together and are positioned on the same vertical surface.

As a further improvement of the invention, the armature column plate consists of an armature cover cap frame and an electrode column plate groove, the armature cover cap frame is arranged on the left side of the electrode column plate groove, and the armature cover cap frame and the electrode column plate groove are nested into a whole and are positioned on the same vertical plane.

As a further improvement of the invention, the lining fastener seat is composed of a fastener strip block and a lining plate, wherein the fastener strip block is arranged inside the lining plate, and the fastener strip block is fastened with the lining plate and is positioned on the same vertical plane.

As a further improvement of the invention, the buckle strip block is composed of a strip groove block and a buckle folded plate, the buckle folded plate is installed inside the strip groove block, and the buckle folded plate and the strip groove block are inserted together and are positioned on the same vertical plane.

As a further improvement of the invention, the power distribution socket barrel consists of a pin plug board and a cable harness barrel, wherein the pin plug board is arranged on the left side of the cable harness barrel, and the pin plug board is electrically connected with the cable harness barrel and is vertical to the cable harness barrel.

As a further improvement of the invention, the pin plug board consists of three pin distributing pipes and an integrated circuit board, wherein the three pin distributing pipes are arranged on the right side of the integrated circuit board, and the pin distributing pipes are inserted into the integrated circuit board and are vertical to the integrated circuit board.

As a further improvement of the invention, the magnet fan plate frame is of a composite plate frame structure with a concave magnet rod sleeve wiring ring attached to the fan plate, so that the flexible control operation effect of preventing consumption of the whole amplification electromagnetic field of the magnet by adapting the armature to be aligned and breakdown the inductive adsorption is facilitated.

As a further improvement of the invention, the armature hood hat rack is of a trapezoidal hood hat groove structure with an armature block inserting support rod on the left side, so that the transverse electromagnetic adsorption sliding plate is convenient to form an electromagnetic regulation and control operation effect of the mechanical door opening and closing lock.

As a further improvement of the invention, the buckle folded plate is a composite buckle plate structure with a gradient folded plate top provided with a turnover groove column block, so that the clamping operation effect of pressing and pasting the inner top chassis can be conveniently formed by vertically retracting.

As a further improvement of the invention, the pin distributing pipe is a composite wire pipe structure with a pin piece column cap at the right end for inserting a copper wire, so that the transverse adaptive program lock electric control mechanical lock is convenient for three-phase alternating current relay operation and has high linkage efficiency.

Advantageous effects

The invention relates to a computer science control switch door device, wherein a worker programs and operates a program lock in front of a computer to introduce a central control relay to enable an electric distribution jack cylinder and an electromagnetic valve baffle plate to be in auxiliary butt joint with an electromagnetic frame wheel disc and an armature sliding plate groove of an armature electromagnetic frame block, and a lining buckle seat is arranged below the bottom surface of a trapezoidal end cover through a buckle strip block and a buckle strip and a lining plate moving strip groove block and a buckle folding plate to be assembled into an interlocking base with high efficiency, a dangerous pipe wheel seat of an electromagnet fan frame and a magnet fan frame are arranged in a wheel disc frame seat and a protector and are in butt joint with a small stepping motor shaft through a lead to move a winding relay to rotate, so that the electromagnetic force of a magnet is amplified and improved, an armature column plate is formed in the sliding plate frame groove through an armature cover cap frame and an electrode column plate groove to adsorb the regulating operation effect of a sliding plate sliding linkage switch door plate, and the computer science control switch door device obtains the, the flexible butt joint protection operation effect of the program lock and the mechanical lock is guaranteed.

The invention has the following advantages after operation:

an armature electromagnetic frame block is matched with a power distribution slot barrel, a combined type proximity switch is formed by a pin plugboard and a cable bundling barrel on a potential lead on the right side of an armature sliding plate groove in a mode of being connected with an electromagnetic frame wheel disc and the armature sliding plate groove to trigger an electromagnetic adsorption attraction amplification operation effect, a three-phase alternating current pin plugboard which is used for locking a program to a butt mechanical lock through the cable bundling barrel is controlled by a subsequent computer science to form a quick-splicing dustproof sealing operation effect, a butt-jointed internal circuit and a magnetic lock form a mechanical linkage operation, the armature sliding plate groove obtains an automatic door switch locking integrated regulation operation effect, magnetic activity is protected, loss is reduced, and electromagnetic induction amplification is improved.

Drawings

Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of the embodiments of the invention when taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of a computer science-controlled door opening and closing device according to the present invention.

Figure 2 is a detailed schematic top sectional view of the gasket retainer and armature electromagnetic block of the present invention.

Fig. 3 is a detailed aerial view cross-sectional structure diagram of the armature electromagnetic frame block and the power distribution slot tube of the present invention.

Fig. 4 is a detailed top view cross-sectional structural schematic diagram of the armature electromagnetic frame block, the electromagnetic frame wheel disc and the armature sliding plate groove of the invention.

FIG. 5 is an enlarged structural view of the overlooking section of the working state of the buckle block of the present invention.

Fig. 6 is an enlarged structural diagram of a top cross section of the pin strip according to the present invention.

Fig. 7 is an enlarged structural view of the overhead section of the electromagnet fan frame in the working state.

Fig. 8 is a schematic diagram of the enlarged sectional structure of the top view of the working state of the armature column plate of the invention.

Description of reference numerals: gasket buckle seat-1, armature electromagnetic frame block-2, power distribution slot cylinder-3, electromagnetic valve baffle-4, central control relay-5, electromagnetic frame wheel disc-2A, armature sliding plate groove-2B, trapezoidal end cover-2C, electromagnet fan frame-2A 1, wheel disc frame seat-2A 2, protective tube wheel seat-2A 11, magnet fan frame-2A 12, armature column plate-2B 1, sliding plate frame groove-2B 2, armature cover cap frame-2B 11, electrode column plate groove-2B 12, buckle strip block-11, gasket plate-12, strip groove block-111, buckle folded plate-112, pin plug board-31, cable harness cylinder-32, pin branching tube-311 and integrated circuit board-312.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The first embodiment is as follows:

referring to fig. 1 to 8, the present invention provides a computer science controlled door opening and closing device, which comprises: the gasket buckling seat 1, the armature electromagnetic frame block 2, the power distribution slot cylinder 3, the electromagnetic valve baffle 4 and the central control relay 5 are arranged, the armature electromagnetic frame block 2 is nested on the left side of the power distribution slot cylinder 3 and is positioned on the same horizontal plane, the gasket buckling seat 1 is tightly attached to the bottom surface of the armature electromagnetic frame block 2 and is positioned on the same horizontal plane, the electromagnetic valve baffle 4 is inserted and embedded in the rear side of the central control relay 5 and is perpendicular to each other, the power distribution slot cylinder 3 is installed on the left side of the central control relay 5 and is positioned on the same horizontal plane, the power distribution slot cylinder 3 is electrically connected with the central control relay 5, the armature electromagnetic frame block 2 is provided with an electromagnetic frame wheel disc 2A, an armature sliding plate slot 2B and a trapezoidal end cover 2C, the electromagnetic frame wheel disc 2A is provided with two left and right sides which are respectively installed inside the armature sliding plate slot 2B, the electromagnetic frame wheel disc 2A is electrically connected with the armature sliding plate slot 2B and is positioned on the, the trapezoidal end cover 2C is nested under the bottom of the armature slide plate groove 2B and on the same vertical plane, and the armature slide plate groove 2B is nested on the left side of the power distribution socket barrel 3 and on the same horizontal plane.

Referring to fig. 4, the electromagnetic frame wheel disc 2A is composed of an electromagnet fan frame 2A1 and a wheel disc frame seat 2A2, the electromagnet fan frame 2A1 is installed at the front side of the wheel disc frame seat 2A2, the electromagnet fan frame 2A1 and the wheel disc frame seat 2A2 are nested together and have collinear axes, the armature slide plate groove 2B is composed of an armature column plate 2B1 and a slide plate frame groove 2B2, the armature column plate 2B1 is installed inside the slide plate frame groove 2B2, the armature column plate 2B1 and the slide plate frame groove 2B2 are inserted and embedded together and are located on the same vertical plane, and an electromagnetically amplified armature and magnetic cylinder expanding and adapting electric control mechanical lock linkage operation effect is formed at one side of the armature column plate 2B1 through the electromagnet fan frame 2A 1.

Referring to fig. 7, the electromagnet fan frame 2a1 is composed of a fuse wheel seat 2a11 and a magnet fan frame 2a12, the magnet fan frame 2a12 is provided with two magnet fan frames 2a12 and respectively installed on the left and right sides of the fuse wheel seat 2a11, the magnet fan frame 2a12 and the fuse wheel seat 2a11 are nested into a whole and are located on the same vertical plane, the magnet fan frame 2a12 is a composite frame structure in which a concave magnet rod sleeve wiring ring is attached to a fan plate, so that the flexible control operation effect of preventing the consumption of the overall amplification electromagnetic field of the magnet is achieved by adapting the armature alignment breakdown inductance absorption, and the motor damping fan brush type electromagnetic amplification operation effect of central power supply is achieved by wrapping the magnet fan frame 2a12 with the fuse wheel seat 2a 11.

Referring to fig. 8, the armature column plate 2B1 is composed of an armature cover cap frame 2B11 and an electrode column plate groove 2B12, the armature cover cap frame 2B11 is installed on the left side of the electrode column plate groove 2B12, the armature cover cap frame 2B11 and the electrode column plate groove 2B12 are nested into a whole and are located on the same vertical plane, the armature cover cap frame 2B11 is a trapezoidal cover cap groove structure with an armature block plug-in support rod on the left side, so that a transverse electromagnetic adsorption sliding plate can conveniently form an electromagnetic regulation and control operation effect of a mechanical door opening and closing lock, and an electrified armature attraction transverse adsorption operation effect is formed by the armature cover cap frame 2B11 and the electrode column plate groove 2B12, so that the locked switch obtains an operation effect of electrode breakdown adaptation proximity switch debugging.

Referring to fig. 2, the lining fastener seat 1 is composed of a fastener strip 11 and a lining plate 12, the fastener strip 11 is installed inside the lining plate 12, the fastener strip 11 and the lining plate 12 are fastened together and are located on the same vertical plane, and a top fastening fit operation effect is formed at the middle section of the lining plate 12 through the fastener strip 11.

Referring to fig. 5, the buckle strip block 11 is composed of a strip groove block 111 and a buckle folded plate 112, the buckle folded plate 112 is installed inside the strip groove block 111, the buckle folded plate 112 and the strip groove block 111 are inserted and embedded together and are located on the same vertical plane, the buckle folded plate 112 is a composite buckle plate structure with a turning groove column block at the top of a gradient folded plate, so that the upper and lower retraction is facilitated to form a clamping operation effect that the inner top chassis is pressed and attached, and the strip groove block 111 wraps the buckle folded plate 112 so that the insertion and retraction is facilitated to form an assembly operation effect that the bottom surface is locked and prevented from being released.

The working process is as follows: the working personnel program and operate in front of the computer to lock and lead in the central control relay 5 to lead the power distribution slot cylinder 3 and the electromagnetic valve baffle 4 to be in auxiliary butt joint with the electromagnetic frame wheel disc 2A and the armature sliding plate slot 2B of the armature electromagnetic frame block 2, and the lining buckle seat 1 drives the strip slot block 111 and the buckle folded plate 112 to be assembled into an interlocking base efficiently through the buckle strip block 11 and the inserting buckle lining plate 12 under the bottom surface of the trapezoidal end cover 2C, the danger pipe wheel seat 2A11 of the electromagnet fan frame 2A1 and the magnet fan frame 2A12 are in butt joint with the small stepping motor shaft by a lead in the wheel frame seat 2A2 and the protection seat, so that the electromagnetic force of the magnet is amplified and improved, the armature column plate 2B1 forms the regulating and regulating operation effect of the adsorption sliding plate slot 2B2 through the armature cover cap frame 2B11 and the electrode column plate slot 2B12, and the regulating operation effect of the electromagnetic field force amplification and consumption prevention operation of, the flexible butt joint protection operation effect of the program lock and the mechanical lock is guaranteed.

Example two:

referring to fig. 1 to 8, the present invention provides a computer science controlled gate opening and closing device, which is otherwise the same as embodiment 1, except that:

referring to fig. 3, the power distribution socket barrel 3 is composed of a pin insertion board 31 and a cable harness barrel 32, the pin insertion board 31 is installed on the left side of the cable harness barrel 32, the pin insertion board 31 is electrically connected with the cable harness barrel 32 and is perpendicular to the cable harness barrel 32, and a three-phase alternating current relay butt joint computer central control debugging operation effect is formed on one side of the cable harness barrel 32 through the pin insertion board 31.

Referring to fig. 6, the pin junction board 31 is composed of three pin junction pipes 311 and an integrated circuit board 312, the three pin junction pipes 311 are all installed on the right side of the integrated circuit board 312, the pin junction pipes 311 are inserted and embedded with the integrated circuit board 312 and are perpendicular to each other, the pin junction pipes 311 are of a composite pipe structure with a pin piece cap at the right end for inserting copper wires, transverse adaptive program locking and electric control mechanical locking of three-phase alternating current relay operation are facilitated, linkage efficiency of the electric control mechanical locking is high, precision of an electric control end is high through relay butt joint operation of the pin junction pipes 311 and the integrated circuit board 312, and continuous conduction stability of three-phase alternating current is high.

Through the central control matching of the mechanical electromagnetic lock and the program lock of the early-stage plugging internal circuit, the pin plugging plate 31 of the power distribution slot cylinder 3 is in butt joint with the integrated circuit board 312 through the pin distributing pipe 311 on the left side of the cable harness cylinder 32 to transversely conduct the armature and the magnet to amplify the electromagnetic induction field force, so that the flexible switching and adapting computer science integrated control operation effect of the locking switch and the proximity switch is realized.

The invention achieves the operation effect that a combined proximity switch is formed by matching the armature electromagnetic frame block 2 with the power distribution slot barrel 3 and connecting the armature wheel disc 2A and the armature sliding plate slot 2B to trigger electromagnetic absorption attraction amplification through the potential lead wire on the right side of the armature sliding plate slot 2B by the pin insertion plate 31 and the cable bundle barrel 32, ensures that a program lock is locked by the cable bundle barrel 32 to form a quick insertion dustproof sealing operation effect on the three-phase alternating current pin insertion plate 31 of the mechanical lock, also ensures that the butted inner circuit and the magnetic lock form mechanical linkage operation, ensures that the armature sliding plate slot 2B obtains the locking integrated regulation and control operation effect of the automatic door switch, protects the magnetic activity, reduces the loss and improves the electromagnetic induction amplification, thereby solving the problem that the computer science control forms a combined program lock and mechanical lock linkage regulation and control operation effect on the locking device and the proximity switch, the inserted potential butt joint operation can cause the insufficient strength of the magnet adsorption force and the armature framework of the automatic door switch due to electrostatic interference, so that the electromagnetic field has strong interference, thereby slowing the regulation of the door motion, ensuring the insufficient attraction strength, and easily causing the problem that the magnet magnetism is interfered, continuously lost and the working efficiency is reduced due to the hard breaking of the external force at the door closing end.

The specific embodiments described herein are merely illustrative of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims appended hereto.