A locking device for platform sliding door

Abstract

The present invention discloses a locking device for a platform sliding door, which comprises: a mounting seat, two locking tongues, an unlocking mechanism and two locking mechanisms; the unlocking mechanism comprises an electromagnet, a driving block and two crank connecting rods; the locking mechanism comprises two locking plates, a transmission locking rod and a lock body, the lock body comprises a rotary lock piece, the end of the locking tongue is inserted into the lock body to push the rotary lock piece to rotate and lock with it, the rotary lock piece rotates to make the transmission locking rod move downward, and under the action of the reset force of the unlocking mechanism, the locking plate and the transmission locking rod are locked in a locked position; unlocking is achieved by energizing the electromagnet to drive the driving block to move upward, driving the locking plate to disengage from the locked position with the transmission locking rod through the crank connecting rod, and the locking tongue can be disengaged from the rotary lock piece, thereby realizing the unlocking of the sliding door. The present invention has a reasonable structural design and good reliability and stability.

Description

Technical Field

[0001] The invention relates to a locking device for a platform sliding door and belongs to the technical field of urban rail transit. Background Art

[0002] Most of the existing electric locking devices for full-height platform doors used in rail transit platform door systems or rapid transit platform door systems use electromagnets to drive the lock pin to move, and the lock pin and the lock block installed on the sliding door form a locking relationship. Specifically, when opening the door, the electromagnet drives the lock pin to move and releases the lock of the lock pin on the lock block, so that the sliding door of the full-height platform door is in an openable state; when closing the door, before the sliding door of the full-height platform door is fully closed, the electromagnet drives the lock pin to move, so that the sliding door is closed in place; after the sliding door of the full-height platform door is fully closed, the electromagnet drives the lock pin to move again, and the lock pin locks the lock block, so that the sliding door of the full-height platform door is in a locked state. The working units and trigger mechanisms of the electric locking device for door in place, automatic locking in place, and manual unlocking in place are independent of each other. The electromagnet is in a working state when opening and closing the door. The installation accuracy requirements are high, and it is not easy to adjust. It is difficult to adapt to wind loads and other conditions, resulting in inconvenience in opening and closing the door when the sliding door position of the full-height platform door changes, and the reliability is low.

[0003] CN 106013991 B discloses an electric locking device for a full-height platform door, which uses an electromagnet assembly or other driving assembly to drive a lock plate to move. The lock plate and a lock pin installed on a sliding door form a working state. When the door is opened, the electromagnet drives the lock plate to move, unlocks the lock pin, and puts the sliding door in an openable state; when the door is closed, the lock pin pushes the lock plate to move under the action of the closing force during the closing process of the sliding door. After the sliding door is fully closed, the lock pin is locked by the lock plate, so that the sliding door is in a locked state; its advantages are simple structure, the electromagnet assembly is only in a working state when the door is opened, and its installation and adjustment are convenient, adjustable and adaptable, and low cost. However, there are the following disadvantages: 1) Locking is only dependent on the lock plate.

[0004] CN 101666189 B discloses a rail transit screen door locking device, which includes a lock seat and a locking mechanism installed on the lock seat, an electromagnetic unlocking mechanism, a dynamic unlocking mechanism and a signal generating mechanism. The locking mechanism is arranged on the front side of the lock seat, including left and right lock blocks and left and right lock tongues that are symmetrically arranged, the left and right lock blocks and the left and right lock tongues are respectively rotatably installed on the lock seat, a lock block reset spring is connected between the left and right lock blocks, a lock tongue reset spring is connected between the left and right lock tongues, a locking and unlocking relationship is formed between the left lock block and the left lock tongue, and a locking and unlocking relationship is formed between the right lock block and the right lock tongue. The left and right lock blocks limit the sliding door limit pins connected to the sliding door to achieve the locking and unlocking of the sliding door. The disadvantages are: 1. The reset of the left and right lock blocks and the left and right lock tongues adopts the reset spring. When the car door is closed, the reset spring is in a stretched state, so long-term stretching easily leads to spring fatigue failure. At the same time, there is also a problem that the fatigue degree of the lock block reset spring and the lock tongue reset spring is inconsistent, which causes the lock block and the lock tongue to reset asynchronously, causing jamming. 2. The clearance between the lock block and the limit pin of the sliding door is required to be high. If the clearance is too large or too small, it may cause jamming. 3. The clearance between the lock block and the lock tongue is required to be relatively high, which is easy to cause jamming. In summary, the curved groove of the lock block used to lock with the limit pin of the sliding door is difficult to process and requires high precision. The lock hook of the lock tongue that locks with the lower arm of the lock block also needs to cooperate well to unlock and lock smoothly. The reset spring is in a stretched state for a long time and is prone to fatigue failure.

[0005] Therefore, a rail transit platform door locking device with a reasonable structure in which the locking parts will not get stuck and the return spring will not be in a stretched state for a long time and cause fatigue damage has become a goal pursued by those skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to solve the problems of unreasonable structural design of the existing rail transit platform door locking device, high precision requirement of the locking member, and fatigue failure of the return spring of the locking member due to being in an open state for a long time.

[0007] To achieve the above-mentioned invention object, the technical solution of the present invention is: a locking device for a platform sliding door, comprising: a mounting seat, locking tongues symmetrically arranged on two sliding doors, an unlocking mechanism located at the center of the mounting seat and two locking mechanisms symmetrically arranged on both sides of the unlocking mechanism;

[0008] The unlocking mechanism comprises: an electromagnet for electric unlocking, which is arranged at the lower part of the central position of the mounting seat; a driving block, which is sleeved on the push rod of the electromagnet; two crank connecting rods, which are symmetrically arranged on both sides of the push rod; the crank connecting rod comprises a first arm and a second arm arranged in a V shape, and is arranged on the mounting seat through a hinge shaft at the connection between the first arm and the second arm; the driving block is movably connected to the first arm, and is used to drive the crank connecting rod to rotate;

[0009] The locking mechanism includes two lock plates, which are horizontally symmetrically arranged on both sides of the push rod, and the second arm end of the crank connecting rod is movably connected to one end of the lock plate, so as to drive the lock plate to switch between the locked position and the unlocked position; two transmission lock rods, which are vertically symmetrically arranged on both sides of the push rod, and the transmission lock rod is rod-shaped; the lock plate is locked with the transmission lock rod through a locking structure, and when the lock plate is in the locked position, it can stop the transmission lock rod from moving upward, and when the lock plate is in the unlocked position, the restriction on the upward movement of the transmission lock rod is released; two lock bodies, which are symmetrically arranged on both sides of the push rod and are located directly below the transmission lock rod; the top of the lock body is open for the lower end of the transmission lock rod to extend into, and the outer sides of the two lock bodies have lock holes for the lock tongues to insert;

[0010] The lock tongue is in the shape of a long strip, and the end of the lock tongue is inserted into the lock body from the lock hole and locked with the lock body, and drives the transmission lock rod to move up and down, so that the lock plate and the transmission lock rod are switched between the locked position and the unlocked position.

[0011] As a preferred solution, the driving block is movably connected to the first arm as follows: a waist-shaped long hole is horizontally arranged at the central position of the driving block; a first sliding pin is provided at the free end of the first arm, and the first sliding pins of the two crank connecting rods extend to the two sides of the long hole of the driving block respectively;

[0012] The end of the second arm is movably connected to one end of the lock plate: a waist-shaped sliding hole is provided at the free end of the second arm; one end of the lock plate has a second sliding pin, the second sliding pin is adapted to the sliding hole on the second arm of the crank connecting rod, and the second sliding pin is inserted into the sliding hole;

[0013] The locking structure includes: a locking rod locking portion located on the transmission lock rod and arranged up and down and locked with the lock plate, and a locking rod stopping portion stopped by the lock plate; a first U-shaped opening provided on the lock plate facing the side of the transmission lock rod, and a second U-shaped opening at the bottom of the first U-shaped opening; the opening width of the second U-shaped opening is smaller than the opening width of the first U-shaped opening; the diameter of the locking rod locking portion is smaller than the diameter of the locking rod stopping portion; the width of the second U-shaped opening is larger than the diameter of the locking rod locking portion and smaller than the diameter of the locking rod stopping portion, and the diameter of the locking rod stopping portion is adapted to the first U-shaped opening.

[0014] As a preferred solution, the lock body comprises a square outer shell, a rotary lock piece is installed in the outer shell through a rotating shaft; the two rotary lock pieces are arranged symmetrically; the circumference of the rotary lock piece has a protrusion, and a concave portion adjacent to the protrusion is arranged on the side facing the electromagnet; a protruding lock tooth is provided on the side opposite to the concave portion of the rotary lock piece, and a U-shaped groove is provided adjacent to the lock tooth on the side facing the center of the electromagnet; the top surface of the outer shell of the lock body is open, and the lower end of the transmission lock rod is inserted therein;

[0015] The outer side of the lock body shell has a lock hole for inserting the lock tongue, the front end of the lock tongue has a push cross bar embedded in the groove for pushing the rotary lock plate to rotate, and the square lock hole for inserting the lock tooth is provided behind the push cross bar;

[0016] When the lock tongue is inserted, the lock tooth is inserted into the square lock hole, and the recessed portion is rotated under the transmission lock rod, and the transmission lock rod is in a locked state; when the lock tongue is pulled out, the lock tooth is disengaged from the square lock hole, the protruding portion is rotated under the transmission lock rod, and the transmission lock rod is in an unlocked state.

[0017] As a preferred solution, further, an upper guide plate and a lower guide plate are arranged parallel to each other and fixed on the mounting seat at the upper and lower parts of the locking plate, and a horizontal slide groove is formed between the upper guide plate and the lower guide plate for guiding the locking plate.

[0018] As a preferred solution, wherein: further, a guide sleeve is provided outside the transmission lock rod and is fixed on the mounting seat to provide a guide for the transmission lock rod to move up and down vertically; a stop ring is provided on the transmission lock rod to limit the transmission lock rod from falling to the locking position.

[0019] As a preferred solution, the center line of the groove is offset from the radius of the rotary lock piece by an acute angle α, and the acute angle α is 15-30°.

[0020] As a preferred solution, the mounting seat is in the shape of a box, and a cover plate is provided in front of the mounting seat.

[0021] As a preferred solution, wherein: a first travel switch is provided above the push rod of the electromagnet, and a second travel switch and a third travel switch are provided above the transmission lock rods on the left and right sides; the push rod has a first triggering portion extending upward for triggering the first travel switch, and the lock rod locking portion of the transmission lock rod has a second triggering portion extending upward.

[0022] The locking device for platform sliding doors described in the present invention has the following advantages: when the door is closed and locked, the two lock tongues move toward each other, and the pushing cross bar at the front end of the lock tongue enters the groove of the rotary lock plate, pushing the rotary lock plate to rotate, the left rotary lock plate rotates counterclockwise, and the right rotary lock plate rotates clockwise, so that the lock tooth behind the groove is just inserted into the square lock hole of the lock tongue; at the same time, the rotary lock plate rotates, so that the protruding part of the rotary lock plate disengages from the lower end of the transmission lock rod due to rotation, and the recessed part of the rotary lock plate rotates to the lower end of the transmission lock rod, and the transmission lock rod falls into the recessed part under the action of the return spring. At this time, the lock rod stop part of the transmission lock rod is stopped by the second U-shaped opening of the lock plate and cannot move upward, thereby making the transmission lock rod The dynamic locking rod is maintained in the recessed part of the rotary locking plate and the locking teeth are maintained in the locked position of the square lock hole; the locking plate stops the transmission locking rod in the following way: the push rod of the electromagnet moves downward under the action of the reset force, and the push rod drives the crank connecting rod on the left side to rotate clockwise through the driving block, and drives the crank connecting rod on the right side to rotate counterclockwise, and the crank connecting rod drives the left and right locking plates to move to the left and right sides respectively, so that the second U-shaped opening is engaged with the locking part of the locking rod. The width of the second U-shaped opening is smaller than the diameter of the locking rod stop part. Therefore, the upward movement of the locking rod stop part can be restricted, that is, the locking plate locks the transmission locking rod and keeps it in this position, thereby preventing the door from being opened due to accidental (manual door prying) movement of the lock tongue, thereby achieving door closing and locking.

[0023] When the sliding door is opened and unlocked, the electromagnet of the unlocking mechanism is energized and the iron core moves upward, driving the push rod to move upward, and then driving the crank connecting rod on the left to rotate counterclockwise, driving the crank connecting rod on the right to rotate clockwise, and the crank connecting rod drives the lock plates on the left and right sides to move toward the middle respectively, so that the second U-shaped opening is disengaged from the locking part of the lock rod, and the second U-shaped opening releases the limit on the stop part of the lock rod; at the same time, the lock tongue moves to both sides under the drive of the sliding door, and the pushing cross bar located in the groove of the rotary lock plate drives the rotary lock plate on the left to rotate clockwise and the rotary lock plate on the right to rotate counterclockwise, and the lock tooth comes out of the square lock hole of the lock tongue, and under the drive of the rotary lock plate, the protrusion of the rotary lock plate just rotates to the bottom of the transmission lock rod, lifting the transmission lock rod to complete the unlocking.

[0024] Travel switches are provided for the corresponding electromagnets and the two transmission lock rods. When unlocking, the first triggering part at the top of the push rod of the electromagnet 31 triggers the first travel switch, the rotating lock plate lifts the transmission lock rod, and the second triggering part at the top of the transmission lock rod triggers the second travel switch and the third travel switch respectively; when the three travel switches are triggered, it means that the door has been opened. When locking, the push rod of the electromagnet falls back under the action of the reset force, the first travel switch is released, the transmission lock rod falls back, the second and third travel switches are released, and when the three travel switches are released, the door is locked. Its beneficial effect is: through the action of the three travel switches, it is detected and confirmed that the lock tongue is inserted in place, and it is indirectly confirmed that the door body is closed and locked. When the lock fails, the fault point can be quickly determined.

[0025] The present invention adopts the above-mentioned technical scheme, with an unlocking mechanism arranged in a central position and a locking mechanism symmetrically arranged on both sides of the unlocking mechanism. The unlocking mechanism drives two symmetrically arranged crank connecting rods through a driving block, and further drives the lock plate of the locking mechanism to switch between a locked position and an unlocked position. At the same time, a long plate-shaped lock tongue is inserted into the lock body to drive the transmission lock rod to move up and down, thereby realizing locking and unlocking. Regardless of whether it is in the unlocking or locked state, there is no problem of spring fatigue in the unlocking mechanism in the prior art. Therefore, the present invention effectively solves the problem of easy fatigue failure of parts in the locking mechanism in the prior art.

[0026] Furthermore, in the locking device for platform sliding doors described in the present invention, the locking structure between the lock plate and the transmission lock rod is that the transmission lock rod is designed to be two parts, a small upper part and a large lower part: a lock rod locking part and a lock rod stopping part, and the lock plate cooperating with the lock rod is designed with a first U-shaped opening and a second U-shaped opening; the width of the second U-shaped opening is larger than the diameter of the lock rod locking part and smaller than the diameter of the lock rod stopping part, and the width of the first U-shaped opening is larger than the diameter of the lock rod stopping part, so that the lock plate can lock and unlock the lock rod through linear motion, that is, the movements of the lock rod and the lock plate are both linear motions. Therefore, the two locking parts are easy to achieve manufacturing accuracy, and the accuracy will not be affected due to difficult processing, thereby causing jamming problems.

[0027] Furthermore, in the locking device for platform sliding doors of the present invention, the lock body adopts a rotary lock plate, a protrusion and a recess are arranged on the rotary lock plate, and a groove for inserting a lock tongue and a lock tooth that can be inserted into the tongue are arranged on the rotary lock plate. The lock tongue pushes the rotary lock plate, so that the protrusion and the recess can be respectively rotated to the bottom of the transmission lock rod, thereby realizing the lifting and falling of the transmission lock rod. When it is lifted, it is in an unlocked state, and the transmission lock rod falls to the recessed part and is in a locked state. That is, the conversion of the transmission lock rod between locking and unlocking is realized by the rotary lock plate with a variable diameter, which has high reliability, precise transmission, and no jamming phenomenon.

[0028] Furthermore, the locking device for platform sliding doors described in the present invention is provided with a first travel switch above the electromagnet push rod, and a second travel switch and a third travel switch are provided above the transmission lock rods on the left and right sides; the double set of travel switches are used to respectively detect the movement of the transmission lock rods on the left and right sides, and can respectively determine the states (insertion, extraction) of the lock tongues on both sides to indirectly confirm the switch states of the two doors, and the real-time state information of the lock tongues on both sides is accurately fed back to the outside through the movement of the travel switches, providing more information for the control system.

[0029] The locking device can feedback the door closing signal and locking signal of each of the two doors. When one door is locked, for example, the right sliding door is closed, the transmission lock rod on the right side falls to the locked state position, that is, inserted into the recessed part of the rotary lock plate. However, since the left door is not closed, the transmission lock rod on the left side is still in the unlocked state position, that is, still above the protruding part of the rotary lock plate. At this time, the crank connecting rod on the left side cannot rotate clockwise to enter the locked position, resulting in the electromagnet push rod being unable to fall. At the same time, the crank connecting rod on the right side cannot rotate counterclockwise to enter the locked position. At this time, since the second travel switch on the left side is not released, it can be clearly judged that the left door is not closed. Therefore, the locking device of the present invention can realize that the locking mechanism of a single door cannot be locked when the door is closed. Only when both doors are closed, the locking mechanism will be activated to lock, so that the door cannot be opened again. Moreover, only when the electromagnet is activated again to push the locking mechanism open, the two doors can be opened.

[0030] In summary, the locking device for platform sliding doors described in the present invention has the advantages of small size, strong adaptability, simple and compact structure, rich feedback information, high reliability, and easy maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of a locking device for a platform sliding door according to the present invention;

[0032] Figure 2 , 3 It is a stereoscopic view and a front view of a locking device for a platform sliding door according to the present invention with the end cover removed and the left lock body shell removed;

[0033] Figure 4 is a three-dimensional diagram of the mounting base of the present invention;

[0034] Figure 5 It is a stereoscopic view of a locking device for a platform sliding door according to the present invention without the mounting seat and the left lock body shell;

[0035] Figure 6 , 7 , 8, and 9 are a perspective view, a front view, a top view, and a side view of an unlocking mechanism and a locking structure of a locking device for a platform sliding door according to the present invention;

[0036] Fig.10 , 11 It is a schematic diagram of a locking device for a platform sliding door according to the present invention in a locked state and an unlocked state;

[0037] Fig.12 It is a front view of a rotary lock piece of a locking device for a platform sliding door according to the present invention;

[0038] Fig.13 is a three-dimensional diagram of a locking tongue of a locking device for a platform sliding door according to the present invention;

[0039] Fig.14 is a three-dimensional view of a locking plate of a locking device for a platform sliding door according to the present invention;

[0040] Fig.15 It is a stereoscopic diagram of a crank connecting rod of a locking device for a platform sliding door according to the present invention.

[0041] Description of reference numerals: mounting base 11, extension portion 111, cover plate 12; lock tongue 2, push cross bar 21, square lock hole 22, side push rod 23; unlocking mechanism 3, electromagnet 31, push rod 311, first triggering portion 312; driving block 32, long hole 321; crank connecting rod 33, first arm 331, second arm 332, first sliding pin 333, sliding hole 334, hinge shaft 335; elastic card 34; locking mechanism 4, lock plate 41, second sliding pin 411, first U-shaped opening 413, second U-shaped opening 414; transmission Dynamic locking rod 42, locking rod locking portion 421, locking rod stopping portion 422, second triggering portion 423; lock body 43, housing 430, locking hole 4301; rotary locking plate 431, protrusion 4311, recessed portion 4312, locking tooth 4313, groove 4314, second locking tooth 4313', second groove 4314'; rotating shaft 432; upper guide plate 441, lower guide plate 442, slide groove 443; guide shaft sleeve 45; stop ring 46; first travel switch 51, second travel switch 52, third travel switch 53. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the preferred embodiments cannot be used to limit the protection scope of the present invention.

[0043] See also Figure 1-15 , the figure shows a locking device for a platform sliding door according to the present invention, which comprises:

[0044] See also Figure 1-4 , a mounting seat 11, which is roughly in the shape of a rectangular box, has a downwardly extending protruding portion 111 at the central lower part, and a cover plate 12 is provided in front of the mounting seat 11; the mounting seat 11 and the cover plate 12 enclose a cavity for accommodating various parts.

[0045] See also Fig.13, two lock tongues 2 are arranged on the sliding door, and the two lock tongues 2 are symmetrically arranged. The lock tongue 2 is in the shape of a long strip, and its front end has a push cross bar 21, and a square lock hole 22 is arranged behind the push cross bar. Both ends of the push cross bar 21 have side push rods 23 extending forward and arranged in parallel. The outer side of the side push rod 23 is contracted toward the center, and the side push rod 23 facilitates the lock tongue 2 to enter the lock body 43 (described in detail later);

[0046] An unlocking mechanism 3 for electric unlocking, the unlocking mechanism 3 comprises:

[0047] An electromagnet 31 is disposed at the center of the mounting seat 11, and the lower portion of the electromagnet extends into the extension portion 111 of the mounting seat 11;

[0048] A driving block 32 is arranged on the push rod 311 of the electromagnet 31. Specifically, the driving block 32 is fixed on the push rod 311 through two elastic clips 34. A horizontal waist-shaped long hole 321 is arranged symmetrically with the center line at the central position of the driving block 32. The direction of the long hole 321 is arranged in the front-to-back direction.

[0049] Two crank connecting rods 33 are symmetrically arranged on both sides of the push rod 311; the crank connecting rod 33 includes a first arm 331 and a second arm 332, the upper ends of the first arm 331 and the second arm 332 are connected as a whole to form a V-shaped structure, and the connection between the first arm 331 and the second arm 332 is arranged on the mounting seat 11 through a hinge shaft 335, and the hinge shaft 335 can be directly formed in the mounting seat 11; the driving block 32 is movably connected to the first arm 331 for driving the crank connecting rod 33 to rotate; specifically, the free end of the first arm 331 has a first sliding pin 333, and the first sliding pins 333 of the two crank connecting rods 33 extend to both sides of the long hole 321 of the driving block 32 respectively. Under the drive of the driving block 32, the crank connecting rod 33 rotates around the hinge shaft 335; the free end of the second arm 332 is provided with a waist-shaped sliding hole 334;

[0050] The locking mechanism 4 is symmetrically arranged on both sides of the unlocking mechanism 3.

[0051] The locking mechanism 4 includes two locking plates 41, which are symmetrically arranged on both sides of the push rod 311. The end of the second arm 332 of the crank connecting rod 33 is movably connected to one end of the locking plate 41, and is used to drive the locking plate 41 to switch between the locked position and the unlocked position; specifically, one end of the locking plate 41, that is, the inner end facing the electromagnet, has a second sliding pin 411, and the second sliding pin 411 is adapted to the sliding hole 334 on the second arm 332 of the crank connecting rod 33, and the second sliding pin 411 is inserted into the sliding hole 334, and during the rotation of the two crank connecting rods 33, the two locking plates 41 are driven to move horizontally left and right toward each other or relative to each other;

[0052] The locking mechanism 4 further includes two transmission lock rods 42, which are vertically symmetrically arranged on both sides of the push rod 311. The transmission lock rod 42 is rod-shaped and includes a lock rod locking portion 421 located at the upper portion and a lock rod stopping portion 422 located at the lower portion. The lock plate 41 is locked with the transmission lock rod 42 through a locking structure. When the lock plate 41 is in the locked position, the transmission lock rod 42 can be stopped from moving upward. When the lock plate 41 is in the unlocked position, the restriction on the upward movement of the transmission lock rod 42 is released.

[0053] Specifically, the locking structure includes: a locking rod locking portion 421 located on the transmission locking rod 42 and a locking rod stopping portion 422 stopped by the locking plate 41; a first U-shaped opening 413 provided on the locking plate 41 toward the outside (i.e., toward the transmission locking rod 42) and a second U-shaped opening 414 located at the bottom of the first U-shaped opening 413, wherein the opening width of the second U-shaped opening 414 is smaller than the opening width of the first U-shaped opening 413; the diameter of the locking rod locking portion 421 is smaller than the diameter of the locking rod stopping portion 422; the diameter of the locking rod locking portion 421 is adapted to the width of the second U-shaped opening 414 of the locking plate 41, and the width of the second U-shaped opening 414 is smaller than the diameter of the locking rod stopping portion 422, i.e., the second U-shaped opening 414 allows the locking rod locking portion 421 to pass through, and The locking rod stopper 422 is restricted from passing through, and the diameter of the locking rod stopper 422 is adapted to the first U-shaped opening 413, and the first U-shaped opening 413 allows the locking rod stopper 422 to pass through; when the two crank connecting rods 33 rotate toward the center (that is, the crank connecting rod on the left rotates counterclockwise, and the crank connecting rod on the right rotates clockwise), the two locking plates 41 are driven to move toward the center respectively (move toward each other), and at this time, the second U-shaped opening 414 is disengaged from the locking rod locking portion 421, and the transmission locking rod 42 can move upward; when the two crank connecting rods 33 rotate in both directions, the two locking plates 41 are driven to move to both sides respectively (move back to back), and at this time, the second U-shaped opening 414 is engaged with the locking rod locking portion 421, and the second U-shaped opening 414 restricts the transmission locking rod 42 from moving upward;

[0054] The locking mechanism 4 further includes two lock bodies 43, which are symmetrically arranged on both sides of the push rod 311 of the electromagnet 31 and are located directly below the transmission lock rod 42;

[0055] The lock body 43 includes a square shell 430, the top of which is open for the lower end of the transmission lock rod 42, and the outer sides of the two lock bodies 43 have lock holes 4301 for the lock tongue 2 to be inserted, and the end of the lock tongue 2 is inserted into the lock body 43 from the lock hole 4301 and locked with the lock body 43, and can drive the transmission lock rod 42 to move up and down, so that the lock plate 41 and the transmission lock rod 42 can be switched between the locked position and the unlocked position; specifically, two rotary lock pieces 431 are symmetrically arranged directly below the transmission lock rod 42, and the rotary lock pieces 431 can be rotatably fixed in the shell 430 through the rotating shaft 432; the rotary lock piece 431 has a protrusion 4311, and a recessed portion 4312 for locking is arranged adjacent to the protrusion 4311 and is arranged on the side facing the center of the electromagnet; The side opposite to the recessed portion 4312 of the sheet 431 has a protruding lock tooth 4313, and the adjacent lock tooth 4313 has a U-shaped groove 4314 facing the electromagnet. The groove 4314 is used to receive the insertion of the lock tongue 2, and by pushing the rotary lock plate 431 to rotate, the lock tooth 4313 is inserted into the square lock hole 22 of the lock tongue 2. At the same time, when the lock tongue 2 is inserted, the rotary lock plate 431 on the right rotates clockwise and the rotary lock plate 431 on the left rotates counterclockwise, so that the recessed portion 4312 rotates to the bottom of the transmission lock rod 42, and the transmission lock rod 42 falls to the locked position, and the lock plate 41 locks the transmission lock rod in this position; preferably, the center line of the groove 4314 is set in a direction offset by an acute angle α from the radius of the rotary lock plate 431, so that the insertion of the lock tongue 2 can be facilitated.

[0056] Further, a stop ring 46 is provided on the transmission lock rod 42 to limit the transmission lock rod from falling to the locking position;

[0057] In order to make the lock plate 41 move horizontally smoothly, further, an upper guide plate 441 and a lower guide plate 442 are arranged in parallel and fixed on the mounting seat 11 at the upper and lower parts of the lock plate 41, and a horizontal slide groove 443 is formed between the upper guide plate 441 and the lower guide plate 442, and the slide groove 443 makes the lock plate 41 move horizontally smoothly and smoothly; in order to make the transmission lock rod 42 move up and down smoothly, further, a guide sleeve 45 is provided outside the transmission lock rod 42, and the guide sleeve 45 is fixed on the mounting seat 11 to provide a guide for the transmission lock rod 42 to move vertically up and down;

[0058] When the door is closed and locked, the pushing cross bar 21 at the front end of the lock tongue 2 enters the groove 4314, pushing the rotary lock piece 431 to rotate, the rotary lock piece 431 on the left rotates counterclockwise, and the rotary lock piece 431 on the right rotates clockwise, so that the lock tooth 4313 is just inserted into the square lock hole 22 of the lock tongue 2; at the same time, the rotary lock piece 431 rotates, so that the protruding portion 4311 of the rotary lock piece 431 is disengaged from the lower end of the transmission lock rod 42 due to rotation, and the recessed portion 4312 of the rotary lock piece 431 rotates to the lower end of the transmission lock rod 42, and the transmission lock rod 42 falls into the recessed portion 4312 under the action of the return spring. At this time, the stop ring 46 restricts the transmission lock rod 42 from falling into the recessed portion 4312, and the transmission lock rod 42 is stopped by the lock plate 41 and cannot move upward, thereby making the transmission lock The rod 42 is maintained in the locked position of the recessed portion 4312 of the rotary lock plate 431; the locking plate 41 stops the transmission lock rod 42 in the following way: the electromagnet 31 moves downward under the action of the reset force, driving the push rod 311 to move downward, and the push rod 311 drives the crank connecting rod 33 on the left side to rotate clockwise through the driving block 32, and drives the crank connecting rod 33 on the right side to rotate counterclockwise, and the crank connecting rod 33 drives the left and right lock plates 41 to move to the left and right sides respectively, so that the second U-shaped opening 414 is engaged with the lock rod locking portion 421, and the width of the second U-shaped opening 414 is smaller than the diameter of the lock rod stop portion 422, so the lock rod stop portion 422 can be limited to move upward, that is, the lock plate 41 locks the transmission lock rod 42 and keeps it in this position, thereby preventing the door from being opened due to accidental movement of the lock tongue 2 (manual door prying), thereby achieving door closing and locking.

[0059] When the sliding door is unlocked, the electromagnet 31 of the unlocking mechanism 3 is turned on, the iron core moves upward, driving the push rod 311 and the driving block 32 to move upward, and the first sliding pin 333 of the crank connecting rod 33 inserted into the long hole 321 of the driving block 32 drives the crank connecting rod 33 to rotate, that is, the crank connecting rod 33 on the left side is driven to rotate counterclockwise, and the crank connecting rod 33 on the right side is driven to rotate clockwise, and the crank connecting rod 33 is driven to rotate clockwise through the second sliding pin 411 inserted into the sliding hole 334 of the second arm 332. The lock plates 41 on the left and right sides are driven to move toward the middle respectively, so that the second U-shaped opening 414 is disengaged from the locking portion 421 of the lock rod, and the second U-shaped opening 414 releases the limit on the lock rod stop portion 422, thereby achieving unlocking; at the same time, the lock tongue 2 moves to both sides under the drive of the sliding door, pushing the cross bar 21 to drive the rotary lock piece 431 on the left to rotate clockwise and the rotary lock piece 431 on the right to rotate counterclockwise, and the lock tooth 4313 escapes from the square lock hole 22 of the lock tongue 2. Under the drive of the rotary lock piece 431, the protrusion 4311 of the rotary lock piece 431 just rotates to the bottom of the transmission lock rod 42, lifting the transmission lock rod 42 to complete unlocking.

[0060] Furthermore, a first travel switch 51 is provided above the push rod 311 of the electromagnet 31, and a second travel switch 52 and a third travel switch 53 are provided above the transmission lock rods 42 on the left and right sides; the push rod 311 has a first triggering portion 312 extending upward for triggering the first travel switch 51, and the locking rod locking portion 421 of the transmission lock rod 42 has a second triggering portion 423 extending upward. The three travel switches are used to detect the action of the electromagnet 31 and the two transmission lock rods 42, respectively.

[0061] When the door is unlocked, the system is powered, the electromagnet 31 is powered and activated, and the first triggering part 312 of the push rod 311 triggers the first travel switch 51, the lock tongue 2 opens to both sides along with the sliding door, the lock tongue 2 exits the rotary lock plate 431, the rotary lock plate 431 lifts the transmission lock rod 42, and the second triggering parts 423 of the two transmission lock rods 42 trigger the second and third travel switches 52 and 53 respectively. After the second and third travel switches 52 and 53 are triggered, they change from the original normally closed state to the normally open state, and after the first travel switch 51 is triggered, it changes from the original normally open state to the normally closed state. When all three travel switches are triggered, it indicates that the left and right doors are both opened and in the open state.

[0062] When the door is closed and locked, the lock tongue 2 is inserted into the rotary lock plate 431, driving the rotary lock plate 431 to rotate, the lock tooth 4313 is inserted into the square lock hole 22 of the lock tongue 2, and the two transmission lock rods 42 fall back into the recessed portion 4312 of the rotary lock plate 431; at the same time, the iron core of the electromagnet 31 falls under the action of the reset force, driving the push rod 311 to fall, and the crank connecting rods 33 on the left and right sides rotate clockwise and counterclockwise respectively, driving the lock plate 41 to move to the left and right sides respectively, and the lock plate 41 locks the transmission lock rod 42 and keeps it in this position. When the transmission lock rod 42 falls, the second and third travel switches 52 and 53 are released respectively, and then the electromagnet 31 is reset, and the first travel switch 51 is released, indicating that the doors on both sides are closed. Similarly, only when all three travel switches are released, it indicates that the door has been closed. When the first travel switch is released, but the second and / or third travel switches are not released, it indicates that a fault has occurred.

[0063] See also Fig.12 A set of second locking teeth 4313' and second grooves 4314' can be added to the rotary lock plate 431 at a position 90 degrees adjacent to the locking teeth 4313 and the grooves 4314, which can be used to cooperate with the locking tongue when it is arranged in a vertical direction.

[0064] It should be noted that the above specific implementation is a preferred embodiment of the present invention, wherein the driving block 32 is movably connected to the first arm 331, and a driving pin may be provided on the driving block 32, and a corresponding sliding groove may be provided at the free end of the first arm to realize the movably connected therebetween. The end of the second arm 332 of the crank connecting rod 33 and one end of the locking plate 41 may also be movably connected by providing a sliding pin at the upper end of the second arm, and providing a sliding hole corresponding to the sliding pin at the end of the locking plate 41 to realize the movably connected therebetween. In addition, the locking structure between the lock plate 41 and the transmission lock rod 42 can also be other structures that realize the upward movement of the transmission lock rod 42 in the locked position. For example: a horizontally arranged lock hole is provided on the transmission lock rod 42, and a lock pin corresponding to the lock hole is provided on the lock plate, and the lock pin has two parts: a small diameter part at the front end and a large diameter part located behind the small diameter part, the diameter of the large diameter part is adapted to the diameter of the lock hole, and the gap between the small diameter part and the lock hole is larger than the lifting distance of the transmission lock rod to achieve unlocking; when the small diameter part at the front end of the lock plate is inserted into the lock hole, due to the effect of the gap, the transmission lock rod can still move upward to the unlocking position, and when the large diameter part of the front end plate of the lock is inserted into the lock hole, the upward movement of the transmission lock rod can be restricted to achieve locking. Therefore, it can be seen that the above embodiment is only a preferred embodiment of the present invention.

[0065] The unlocking and door opening process of the present invention is as follows: the electromagnet 31 is energized to move, and the first travel switch 51 is pushed and triggered through the transmission lock rod 42. At the same time, the driving block 32 installed on the electromagnet push rod 311 drives the crank connecting rods 33 on both sides to rotate, and the crank connecting rods 33 drive the lock plate 41 to move along the slide groove 443, and the lock plate 41 moves away from the locking position. The motor of the sliding door is started to drive the door body to open the door, and the lock tongue 2 installed on the door body is synchronously pulled out of the lock body 43. When the lock tongue 2 is pulled out, it drives the rotary lock plate 431 to rotate. The rotary lock plate 431 uses its own structure-the protrusion 4311 to lift the transmission lock rod 42, and the lifted transmission lock rod 42 pushes the second and third travel switches 52, 53 and triggers. At this time, the electromagnet 31 is powered off, and the electromagnet push rod 311 retreats under the action of the reset force, and the driving block 32 drives the crank connecting rod 33 to rotate and push the lock plate 41 back, but the lock plate 41 cannot return to its original position because the transmission lock rod 42 is pushed up. At this time, the first travel switch 51 triggered above the electromagnet fails to reset and is still in the triggered state. At this time, the lock tongue withdraws from the lock body to complete the door opening, and the three travel switches are all in the triggered state. The normally closed circuit connected to the normally closed point is disconnected, and the normally open points of the three travel switches are closed after being triggered to output signals to the outside.

[0066] The principle of extracting the door-closing and locking signals of the present invention is as follows: the door-closing signal is provided by the normally open points of the second and third travel switches 52 and 53 on the left and right sides. When the lock tongue 2 is inserted into the lock body 43, the lock tongue 2 drives the rotary lock plate 431 to rotate. The transmission lock rod 42 lifted up by the rotation of the rotary lock plate 431 moves downward and resets under the elastic force of the springs of the second and third travel switches. The second and third travel switches triggered by the lifting of the transmission lock rod 42 reset, and the normally open point changes from closed to open, and the normally closed point changes from open to closed. The door-closing signal is transmitted to the controller through the opening and closing changes of the contacts of the second and third travel switches. The locking signal is provided by the normally open point of the first travel switch 51 above the electromagnet 31. After unlocking and opening the door, the lock plate 41 is stuck by the transmission lock rod 42 and cannot be reset, so that the first travel switch 51 above the middle electromagnet 31 is still in the triggered state. When the door lock tongue 2 is inserted into the lock body 43, the transmission lock rod 42 is reset, and the lock plate 41 resets and the blocking is eliminated. Under the reset force of the first travel switch 51 and the deadweight of the electromagnet push rod 311, the lock plate 41 is reset, the second and third travel switches are reset, the normally open point changes from closed to open, and the normally closed point changes from open to closed. The opening and closing changes of the travel switch contacts transmit the closing signal to the controller. When all three travel switches are reset, the circuit connecting the three normally closed points is turned on, and the circuit conduction signal is fed back to the controller.

[0067] The above description is only illustrative and not restrictive of the present invention. The present invention aims to provide a platform sliding door safety lock. Those skilled in the art understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, such as changing the movable connection between the drive block and the first arm, and between the second arm end of the crank connecting rod and one end of the lock plate, but all of these will fall within the scope of protection of the present invention.

Claims

1. A locking device for a platform sliding door, comprising: a mounting base (11), The lock tongues (2) are symmetrically arranged on the two sliding doors. An unlocking mechanism (3) located at the center of the mounting seat (11) and two locking mechanisms (4) symmetrically arranged on both sides of the unlocking mechanism (3); The unlocking mechanism (3) comprises: an electromagnet (31) for electric unlocking, arranged at the lower part of the central position of the mounting seat (11); A driving block (32) sleeved on the push rod (311) of the electromagnet (31); two crank connecting rods (33) symmetrically arranged on both sides of the push rod (311); the crank connecting rod (33) comprises a first arm (331) and a second arm (332) arranged in a V shape, and is arranged on the mounting seat (11) via a hinge shaft (335) at the connection between the first arm (331) and the second arm (332); the driving block (32) is movably connected to the first arm (331) and is used to drive the crank connecting rod (33) to rotate; The locking mechanism (4) comprises: Two locking plates (41) are horizontally symmetrically arranged on both sides of the push rod (311), and the end of the second arm (332) of the crank connecting rod (33) is movably connected to one end of the locking plate (41) for driving the locking plate (41) to switch between a locked position and an unlocked position; Two transmission lock rods (42) are vertically symmetrically arranged on both sides of the push rod (311), and the transmission lock rods (42) are rod-shaped; the lock plate (41) is locked with the transmission lock rods (42) through a locking structure, and when the lock plate (41) is in a locked position, it can stop the transmission lock rods (42) from moving upwards; when the lock plate (41) is in an unlocked position, the restriction on the upward movement of the transmission lock rods (42) is released; Two lock bodies (43) are symmetrically arranged on both sides of the push rod (311) and are located directly below the transmission lock rod (42); the top of the lock body (43) is open for the lower end of the transmission lock rod (42) to extend into, and the outer side surfaces of the two lock bodies (43) have lock holes (4301) for the lock tongue (2) to be inserted into. The lock tongue (2) is in the shape of a long strip, and the end of the lock tongue (2) is inserted into the lock body (43) from the lock hole (4301) and locked with the lock body (43), and drives the transmission lock rod (42) to move up and down, so that the lock plate (41) and the transmission lock rod (42) are switched between a locked position and an unlocked position.

2. A locking device for a platform sliding door according to claim 1, characterized in that: The driving block (32) and the first arm (331) are movably connected as follows: a waist-shaped long hole (321) is horizontally arranged at the central position of the driving block (32); a first sliding pin (333) is provided at the free end of the first arm (331); and the first sliding pins (333) of the two crank connecting rods (33) extend to two sides of the long hole (321) of the driving block (32) respectively; The end of the second arm (332) is movably connected to one end of the locking plate (41) as follows: a waist-shaped sliding hole (334) is provided at the free end of the second arm (332); one end of the locking plate (41) has a second sliding pin (411), the second sliding pin (411) is adapted to the sliding hole (334) on the second arm (332) of the crank connecting rod (33), and the second sliding pin (411) is inserted into the sliding hole (334); The locking structure comprises: a locking rod locking portion (421) located on the transmission locking rod (42) and arranged up and down and locked with the locking plate (41), and a locking rod stopping portion (422) stopped by the locking plate (41); a first U-shaped opening (413) provided on the locking plate (41) and having a side facing the transmission locking rod (42) and a second U-shaped opening (414) located at the bottom of the first U-shaped opening (413); an opening width of the second U-shaped opening (414) is smaller than an opening width of the first U-shaped opening (413); a diameter of the locking rod locking portion (421) is smaller than a diameter of the locking rod stopping portion (422); a width of the second U-shaped opening (414) is larger than a diameter of the locking rod locking portion (421) and smaller than a diameter of the locking rod stopping portion (422), and a diameter of the locking rod stopping portion (422) is adapted to the first U-shaped opening (413).

3. A locking device for a platform sliding door according to claim 2, characterized in that: The lock body (43) comprises a square outer shell (430), a rotary lock piece (431) being installed in the outer shell (430) via a rotating shaft (432); the two rotary lock pieces (431) being arranged symmetrically on the left and right; the rotary lock piece (431) having a protruding portion (4311) on its circumference, and a recessed portion (4312) being arranged adjacent to the protruding portion (4311) and facing the electromagnet (31); a protruding lock tooth (4313) being provided on the side opposite to the recessed portion (4312) of the rotary lock piece (431), and a U-shaped groove (4314) being provided adjacent to the lock tooth (4313) and facing the center of the electromagnet (31); the top surface of the outer shell (430) of the lock body (43) is open, allowing the lower end of the transmission lock rod (42) to extend therein; The outer side surface of the outer shell (430) of the lock body (43) has a lock hole (4301) for inserting the lock tongue (2), the front end of the lock tongue (2) has a push cross bar (21) embedded in the groove (4314) and used to push the rotary lock plate (431) to rotate, and a square lock hole (22) for inserting the lock tooth (4313) is provided behind the push cross bar (21); When the lock tongue (2) is inserted, the lock tooth (4313) is inserted into the square lock hole (22), and the recessed portion (4312) is rotated to the bottom of the transmission lock rod (42), and the transmission lock rod (42) is in a locked state; when the lock tongue (2) is pulled out, the lock tooth (4313) is disengaged from the square lock hole (22), and the protruding portion (4311) is rotated to the bottom of the transmission lock rod (42), and the transmission lock rod (42) is in an unlocked state.

4. A locking device for a platform sliding door according to claim 3, characterized in that: Furthermore, an upper guide plate (441) and a lower guide plate (442) are provided above and below the locking plate (41) and are arranged in parallel and fixed on the mounting seat (11); a horizontal slide groove (443) for guiding the locking plate (41) is formed between the upper guide plate (441) and the lower guide plate (442).

5. A locking device for a platform sliding door according to claim 4, characterized in that: Furthermore, a guide sleeve (45) is provided outside the transmission lock rod (42) and is fixed on the mounting seat (11) to provide a guide for the transmission lock rod (42) to move vertically up and down; and a stop ring (46) is provided on the transmission lock rod (42) to limit the transmission lock rod from falling to a locked position.

6. A locking device for a platform sliding door according to any one of claims 3 to 5, characterized in that: The center line of the groove (4314) and the radius of the rotary lock plate (431) are arranged in a direction offset by an acute angle α, and the acute angle α is 15-30°.

7. A locking device for a platform sliding door according to any one of claims 1 to 5, characterized in that: The mounting seat (11) is in the shape of a box, and a cover plate (12) is provided in front of the mounting seat (11).

8. A locking device for a platform sliding door according to any one of claims 1 to 5, characterized in that: A first travel switch (51) is provided above the push rod (311) of the electromagnet (31), and a second travel switch (52) and a third travel switch (53) are provided above the transmission lock rods (42) on the left and right sides; the push rod (311) has a first trigger portion (312) extending upwards for triggering the first travel switch (51), and the lock rod locking portion (421) of the transmission lock rod (42) has a second trigger portion (423) extending upwards.

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