Self-checking type elevator speed governor

Abstract

The invention belongs to the field of elevators, solves the problem that a trigger plate is easy to damage when used for detection, and relates to a self-inspection type elevator speed governor. Comprising a rope wheel, a throwing piece which is connected to the rope wheel and can expand outwards through centrifugal force when the rope wheel rotates at an overspeed, a trigger plate which is arranged on the outer side of the throwing piece and is used for being toggled when the throwing piece expands outwards, a switch beating plate which is connected with the trigger plate, and an electrical switch which can be closed by the switch beating plate, and a pushing mechanism is arranged on the throwing piece. The triggering plate is provided with a first triggering part, the triggering plate can be driven to swing towards the center of the rope wheel so that the first triggering part can touch the pushing mechanism during self-inspection, the stopping plate and the triggering plate are connected in a relative sliding mode, the stopping plate is provided with a stopping head, and the stopping head protrudes out of the surface, facing the pushing mechanism, of the first triggering part; and the throwing sheet is configured to expand outwards when the pushing mechanism is pushed by the blocking head. The beneficial effect is that the trigger plate is not easy to damage in the detection process.

Description

Technical Field

[0001] The invention belongs to the field of elevators and relates to a speed governor on a lifting elevator, and in particular to a self-checking elevator speed governor. Background Art

[0002] The elevator speed limiter is used to slow down and stop the car elevator when it is running at overspeed.

[0003] When a car-type elevator is running at overspeed, the traction machine can be stopped by disconnecting the electrical switch, and the brake will hold the traction wheel to stop the car.

[0004] If the car cannot stop, for example, the brake cannot hold the traction sheave, or the traction rope breaks, the elevator speed limiter will activate the safety clamp on the car, so that the safety clamp will hold the guide rails on both sides of the car to stop the car and prevent the car from falling.

[0005] The inspection of the elevator before it is put into use or the inspection during use requires an assessment of whether the safety clamp can be effectively activated.

[0006] The Chinese patent document "CN117735365A" discloses "an automatic detection type elevator speed limiter", which can detect whether the safety clamp can be effectively activated at the normal speed of the elevator without additional components. It uses a swing trigger plate to make the trigger plate push the protrusion to extend the swing plate, simulating the extension of the swing plate in the overspeed state of the elevator, and uses the extension to activate the safety clamp. However, since the trigger part of the trigger plate is subjected to a large force, it is easy to be damaged, which reduces the safety of the elevator. Summary of the invention

[0007] The purpose of the present invention is to provide a self-checking elevator speed governor, which solves the problem of how to prevent a trigger plate from being damaged during detection.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a self-checking elevator speed limiter, comprising a rope wheel, a swinging piece connected to the rope wheel and capable of extending outward by centrifugal force when the rope wheel rotates at an overspeed, a trigger plate arranged on the outside of the swinging piece and used to be toggled when the swinging piece is extended outward, a switch plate connected to the trigger plate, and an electrical switch that can be closed by the switch plate, wherein a pushing mechanism is arranged on the swinging piece, a first triggering part is arranged on the triggering plate, the triggering plate can passively swing toward the center of the rope wheel so that the first triggering part can touch the pushing mechanism during self-checking, and also comprises a blocking plate, the blocking plate and the triggering plate are connected to each other by relative sliding, the blocking plate has a blocking head, the blocking head protrudes from the surface of the first triggering part facing the pushing mechanism, and the swinging piece is configured to extend outward when the pushing mechanism is pushed by the blocking head.

[0009] Preferably, a damping structure is further included, wherein the damping structure is connected to the blocking plate so as to force the blocking head to protrude from the first triggering portion toward the surface of the pushing mechanism.

[0010] Furthermore, the damping structure is a bent rod connected to the blocking plate and capable of deformation.

[0011] Furthermore, one end of the bent rod away from the blocking plate is rotatably connected to the fixed rod.

[0012] Furthermore, the fixing rod is located at the periphery of the rope wheel to act as a rope stop.

[0013] Furthermore, the curved rod has elasticity, and after being squeezed and deformed, the curved rod can recover by using its own elasticity after the squeezing force is released.

[0014] Furthermore, the damping structure is a spring connected to the blocking plate.

[0015] Preferably, a long slot is formed on the trigger plate, a latch is provided on the blocking plate, the latch is inserted into the long slot, and an extending direction of the long slot is substantially consistent with a direction in which the blocking head protrudes from the first trigger portion.

[0016] Preferably, the pushing mechanism includes a first pushing member and a second pushing member, the first pushing member corresponds to the blocking head, the second pushing member corresponds to the first triggering portion, and the first pushing member protrudes forward in its own rotation direction relative to the second pushing member.

[0017] Preferably, it also includes an auxiliary touch plate, which includes a second trigger part and a toggle part. The auxiliary touch plate is connected to the trigger plate and can move toward the center of the rope pulley along with the trigger plate during self-test. The second trigger part is closer to the oncoming pushing mechanism relative to the blocking head. The second trigger part is configured to touch the pushing mechanism during self-test and swing it, and the swing causes the toggle part to close the electrical switch.

[0018] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The self-checking elevator speed limiter of the present invention is provided with a blocking plate, which is used to unfold the flap by toggling the pushing mechanism during testing. The blocking plate and the trigger plate slide relatively, so when the blocking plate contacts the pushing mechanism, it is pushed backward by the pushing mechanism, and the pushing mechanism then pushes the trigger plate to extend outward, and the trigger plate drives the blocking plate to lift up, and the blocking head no longer blocks the pushing mechanism, thereby protecting the blocking plate (or blocking head) from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 It is the principle diagram of the self-checking elevator speed limiter used in the car-type lift elevator; Figure 2 It is a structural diagram of a self-checking elevator speed limiter; Figure 3 yes Figure 2 The enlarged picture in the upper right corner shows the state before detection; Figure 4 Corresponds to Figure 3 , is a schematic diagram of the structure when the trigger plate swings down when the push rod is manually pulled for testing; Figure 5 It is a schematic diagram that the pushing mechanism on the rope pulley moves the auxiliary contact plate, and the auxiliary contact plate pushes the contact on the electrical switch to cut off the power of the electrical switch; Figure 6 yes Figure 5 Schematic diagram of the middle rope pulley continuing to rotate clockwise; Figure 7 yes Figure 6 Schematic diagram of the middle rope pulley continuing to rotate clockwise; Figure 8 It is a three-dimensional enlarged view of the push mechanism, trigger plate, blocking plate, and auxiliary touch plate; Fig. 9 yes Figure 2 An enlarged schematic diagram of the ejector assembly at A in the middle; Fig.10 yes Figure 2 Enlarged schematic diagram of the medium voltage rope assembly; Fig.11 yes Fig.10 Enlarged view of point B in the middle; Fig.12 This is a schematic diagram of the angle adjustment of the rope pressing block; The reference numerals are described as follows: 1. Car; 2. Traction wheel; 3. Counterweight; 4. Guide rail; 5. Speed ​​limiter; 51. Rope pulley; 52. Opening wheel; 53. Trigger link; 54. Safety clamp; 55. Transmission rope; 56. Electrical switch; 561. Contact; 57. Push rod assembly; 571. Push rod; 5711. Pull pin; 572. Bracket; 5721. Front plate; 57211. Perforation I; 5722. Top plate; 57221. Slideway; 5723. Rear plate; 57231. Perforation Hole II; 573, pulling mechanism; 5731, movable plate; 5732, pull rod; 5733, trigger pull plate; 5734, pull ring; 5735, limit pin; 574, baffle; 575, spring; 576, limit mechanism; 5761, blocking part; 5762, convex block; 58, swinging piece; 59, rope pressing assembly; 591, first plate; 592, second plate; 593, accommodating chamber; 594, support rod; 5941, card slot; 595, rope pressing block; 595 1. profiling groove; 596. round rod; 597. adjusting mechanism; 5971. fixing plate; 5972. adjusting rod; 5973. reinforcing nut; 598. gasket; 599. rod sleeve; 5910. snap ring; 59101. first head; 59102. second head; 59103. connecting hole; 5911. pin rod; 5912. swing rod; 5913. first check piece; 5914. second check piece; 510. trigger plate; 5101. first trigger part; 5102, long slot; 511, switch plate; 5111, upper limit part; 5112, lower limit part; 512, pushing mechanism; 5121, first pushing member; 5122, second pushing member; 513, blocking plate; 5131, blocking head; 5132, latch; 514, damping structure; 514a, curved rod; 515, fixed rod; 516, auxiliary touch plate; 5161, second trigger part; 5162, toggle part; 517, rope pulley brake; 6, sling. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1 The self-checking elevator speed limiter 5 is used in a car-type elevator. The car 1 is lifted by a sling 6. One end of the sling 6 is connected to the car 1, and the other end is connected to the counterweight 3. The sling 6 is placed on the traction sheave 2. The traction sheave 2 is driven by a traction motor (not shown) to rotate, so that the car 1 is lifted and lowered along the guide rail 4.

[0022] The car 1 is provided with a safety clamp 54, and the trigger link 53 of the safety clamp 54 is connected to the transmission rope 55 of the speed limiter 5. When the car 1 is raised or lowered, the transmission rope 55 is driven to flow between the rope wheel 51 and the opening wheel 52. When the car falls due to an accident and exceeds the speed limit (for example, when the sling 6 breaks), the rope wheel 51 rotates at an excessive speed. Figure 2 The flap 58 on the middle rope wheel 51 is unfolded due to the centrifugal force and triggers Figure 2 The rope pressing block 595 in the middle presses the transmission rope 55 on the rope wheel 51, and the rope wheel 51 is braked by the rope wheel brake 517 thereon and cannot rotate. Figure 1 The rope pulley 51 and the transmission rope 55 are stopped, and the trigger link 53 is swung due to the continued falling of the car 1. The swinging trigger link 53 triggers the safety clamp 54, causing the safety clamp 54 to clamp the guide rail 4, and the car 1 stops falling.

[0023] The self-checking elevator speed limiter of this example has a self-checking function, that is, it can simulate the overspeed state of the car 1 when the car 1 is running normally, so as to detect whether the safety clamp 54 can clamp the guide rail 4 to stop the car 1 from falling.

[0024] like Figure 3 Shown Figure 2 In the enlarged view at the upper right corner, the trigger plate 510 is swung downward by utilizing the push rod assembly 57 , the trigger plate 510 is connected to the switch plate 511 , and the trigger plate 510 is rotatably connected to the housing of the speed limiter 5 .

[0025] like Figure 4 During the detection, by pulling the pull rod 5732 to the right, the top rod 571 is pulled, and the switch plate 511 rotates clockwise together with the trigger plate 510, and the pulling force is always maintained. The lower end of the trigger plate 510 swings down and approaches the swing plate 58. The auxiliary touch plate 516 is rotatably connected to the trigger plate 510 and swings down with the trigger plate 510.

[0026] like Figure 5 , start the elevator (the brake on the traction sheave 2 has been intervened in advance so that it will not start after the elevator is powered off), the rope wheel 51 rotates clockwise, the pushing mechanism 512 on the swinging piece 58 first pushes the second triggering part 5161 at the lower end of the auxiliary touch plate 516, the auxiliary touch plate 516 rotates counterclockwise, the toggle part 5162 at the upper end of the auxiliary touch plate 516 toggles the contact 561 on the electrical switch 56, the contact 561 moves to the left, the electrical switch 56 is powered off, the elevator is powered off, the traction motor is powered off, but the brake on the traction sheave 2 is not activated, and the car 1 falls. The auxiliary touch plate 516 in this example is preferred and is used to close the electrical switch 56 during testing.

[0027] like Figure 6 , the rope wheel 51 continues to rotate clockwise, and the blocking head 5131 on the blocking plate 513 moves the pushing mechanism 512, causing the swinging piece 58 to rotate counterclockwise around point D and extend outward, simulating the overspeed state of the elevator.

[0028] During the clockwise rotation of the rope wheel 51, the pushing mechanism 512 on the swinging piece 58 pushes the blocking head 5131 to retract. The blocking head 5131 originally protrudes to the left from the first triggering portion 5101 at the lower end of the triggering plate 510. Figure 6 The middle blocking head 5131 is pushed back by the pushing mechanism 512 to be substantially flush with the first triggering part 5101. At this time, the pushing mechanism 512 pushes the inclined surface on the left side of the first triggering part 5101 to swing the trigger plate 510 upward, and the trigger plate 510 rotates counterclockwise. The first triggering part 5101 at the lower end of the triggering plate 510 drives the blocking head 5131 to move upward, so that the blocking head 5131 is separated from the pushing mechanism 512, thereby preventing the blocking head 5131 from being damaged.

[0029] like Figure 7 , the first trigger portion 5101 and the blocking head 5131 move upward together, allowing the pushing mechanism 512 to pass, and at this time the flap 58 has been unfolded.

[0030] As the flap 58 is unfolded, Figure 2 The rope sheave brake 517 in the rope sheave is started, and the rope sheave brake 517 can stop the rope sheave 51 from rotating, and the rope sheave brake 517 can use this area conventional structure. The rope pressing block 595 is triggered simultaneously, and the transmission rope 55 on the rope sheave 51 is compressed. Figure 1 The middle rope wheel 51 and the transmission rope 55 are both braked, and the safety gear 54 will be triggered under normal circumstances.

[0031] like Figure 8 As shown in the stereogram, the pushing mechanism 512 includes a first pushing member 5121 and a second pushing member 5122. The first pushing member 5121 is a protrusion integrally formed on the swinging piece 58. The first pushing member 5121 corresponds to the blocking head 5131 and is used to push the blocking head 5131. The second pushing member 5122 is a cylinder mounted on the swinging piece 58, corresponding to the first triggering part 5101, and is used to push the first triggering part 5101. The first pushing member 5121 and the second pushing member 5122 are axially staggered, corresponding to the blocking head 5131 and the first triggering part 5101 that are axially staggered.

[0032] The first pusher 5121 protrudes forward in the rotation direction relative to the second pusher 5122, that is, Figure 8 The first pusher 5121 is conducive to the blocked head 5131 to be moved to a greater extent, so that the swinging piece 58 is smoothly extended, and the elevator overspeed state is smoothly simulated.

[0033] The first trigger portion 5101 has an inclined surface on its left side, so that the second pushing member 5122 pushes the inclined surface to smoothly extend the first trigger portion 5101 outward.

[0034] Figure 8As shown, the blocking plate 513 and the trigger plate 510 are connected to each other by a long slot 5102 and a latch 5132. The long slot 5102 is provided in the trigger plate 510, and the latch 5132 is provided on the blocking plate 513, and the latch 5132 is inserted into the long slot 5102. The extending direction of the long slot 5102 is substantially consistent with the direction in which the blocking head 5131 protrudes from the first trigger portion 5101.

[0035] Figure 8 As shown, a damping structure 514 is integrally provided on the blocking plate 513, and in this example, the damping structure 514 is a bent rod 514a. The bent rod 514a is elastic, and after being squeezed and deformed, it can restore its shape after the squeezing force is removed. The bent rod 514a can cause the blocking plate 513 to reset, and also cause the blocking head 5131 to protrude the first triggering part 5101 to face the surface of the pushing mechanism 512. One end of the bent rod 514a away from the blocking plate 513 is rotatably connected to the fixed rod 515. The fixed rod 515 is located on the periphery of the rope wheel 51, and acts as a rope stopper, which can prevent the transmission rope 55 from escaping from the rope wheel 51.

[0036] In other implementations, the damping structure 514 may also be a spring connected to the blocking plate 513 to urge the blocking plate 513 to extend forward.

[0037] like Fig. 9 The enlarged view of the self-checking elevator speed limiter hand-pull electrical switch top rod assembly 57 shown ( Figure 2 (see enlarged view at point A in the middle), the push rod assembly 57 mainly includes a push rod 571 and a pulling mechanism 573 for pulling the push rod 571.

[0038] The top rod 571 can move forward and backward ("front" corresponds to Fig. 9 Center left, "back" corresponds to Fig. 9 The bracket 572 includes a front vertical plate 5721, a top plate 5722 and a rear vertical plate 5723. The top plate 5722 is connected to the top of the front vertical plate 5721 and the rear vertical plate 5723, and is located between the front vertical plate 5721 and the rear vertical plate 5723.

[0039] A through hole Ⅰ57211 is formed in both the front vertical plate 5721 and the rear vertical plate 5723 , and the top rod 571 is passed through the through hole Ⅰ57211 .

[0040] A pull pin 5711 is provided at the front end of the push rod 571, and the switch plate 511 can be pulled to the right through the pull pin 5711. The switch plate 511 is connected to the aforementioned trigger plate 510, so that the trigger plate 510 can swing down.

[0041] A baffle plate 574 is disposed on the top rod 571 , and a latch connected to the top rod 571 is disposed on the right side of the baffle plate 574 , and the latch restricts the baffle plate 574 from moving rightward. The baffle plate 574 can move on the top rod 571 .

[0042] A movable plate 5731 is also sleeved on the top rod 571, and the movable plate 5731 can move left and right on the top rod 571. A pull rod 5732 ( Fig. 9 Only one is shown in the figure due to the angle). The pull rod 5732 is inserted through the through hole II 57231 in the rear vertical plate 5723. The two through holes II 57231 are located on both sides of the through hole I 57211 on the rear vertical plate 5723, so that the two pull rods 5732 are located on both sides of the top rod 571, and the pulling force is balanced. The rear ends of the two pull rods 5732 are connected to a trigger pull plate 5733. The trigger pull plate 5733 is provided with a pull ring 5734. A pull rope (not shown) is provided on the pull ring 5734, and the pull rope is used to pull the pull rod 5732 over a long distance.

[0043] A spring 575 is provided between the movable plate 5731 and the baffle plate 574 , and the spring 575 is sleeved on the top rod 571 .

[0044] Pulling the pull ring 5734 to the right moves the movable plate 5731 to the right, thereby pushing the ejector rod 571 to move to the right.

[0045] Fig. 9 It is shown that the spring 575 is shorter, and the length of the spring 575 is less than the maximum distance between the movable plate 5731 and the baffle 574. If the pull ring 5734 is pulled to the right, there will be an idle stroke. The idle stroke is used by the speed limiter during normal use of the elevator (non-detection period).

[0046] The trigger plate 510 is used for normal use of the elevator (in this example, it is used for detection). Figure 3 During normal operation of the elevator, if it exceeds speed, the flap 58 will extend outward due to centrifugal force, and the flap 58 will touch the first trigger part 5101, causing the trigger plate 510 to rotate counterclockwise. The switch plate 511 on the trigger plate 510 pushes the top rod 571 and the toggle part 5162 to the left, thereby pushing the contact 561 to turn off the electrical switch 56.

[0047] The setting of spring 575 cannot add extra thrust burden to the pushing process under the overspeed condition, because the degree of extension of flap 58 and the overspeed of the elevator are designed. Generally, when the elevator reaches 115% of the rated speed, the electrical switch 56 needs to be turned off. If the setting of spring 575 adds extra burden to the counterclockwise rotation of trigger plate 510 when it is triggered, the electrical switch 56 will not be turned off until the elevator exceeds 115% of the rated speed, which brings potential safety hazards. Therefore, spring 575 is set shorter, so that when push rod 571 is pushed to the left by switch plate 511, it is an empty stroke, that is, spring 575 does not play a role.

[0048] like Fig. 9The top rod assembly 57 also includes a limiting mechanism 576 for limiting the maximum rightward travel of the movable plate 5731. The limiting mechanism 576 includes a blocking portion 5761 and a protrusion 5762. The blocking portion 5761 is located on the top plate 5722 and is a part of the top plate 5722. The protrusion 5762 is located on the movable plate 5731. The blocking portion 5761 is located at the rear side of the protrusion 5762 and on the moving path of the protrusion 5762. The blocking portion 5761 blocks the protrusion 5762 to stop the movable plate 5731 from moving backward. When the movable plate 5731 stops moving backward, the spring 575 between the movable plate 5731 and the baffle 574 can still be compressed for a distance.

[0049] like Figure 6 As shown, during the testing process, the operator often pulls the rod 5732 to the right with a greater force to ensure the effectiveness of the test, which easily compresses the spring 575 completely. Figure 6 and Figure 7 It can be seen that during the test, the pushing mechanism 512 needs to pass through the first triggering part 5101, and if the spring 575 is fully compressed, the top rod 571 is not easy to move to the left, and the switch plate 511 has a tendency to rotate counterclockwise. At this time, the pull pin 5711 on the top rod 571 is easy to bend or break due to stress, causing damage to the speed limiter. If the damage is not discovered, it will bring safety hazards to the elevator. Therefore, limiting the maximum rightward travel of the movable plate 5731 is conducive to protecting the speed limiter.

[0050] Figure 6 In this state, the movable plate 5731 is limited to the maximum right position, and the spring 575 is not completely compressed and can still be compressed. However, the elastic force of the spring 575 is small enough to enable the pushing mechanism 512 to overcome the elastic force of the spring 575 and push the trigger plate 510 to rotate counterclockwise, so that the swinging piece 58 passes smoothly. Generally, the force of the car 1 falling is very large, so the pushing force of the pushing mechanism 512 on the first trigger part 5101 is relatively large.

[0051] like Fig. 9 In order to guide the protrusion 5762 , a slide groove 57221 is opened on the top plate 5722 , and the aforementioned blocking portion 5761 is located on the right side of the slide groove 57221 .

[0052] like Fig. 9The pull rod 5732 and the movable plate 5731 are detachable, and a pluggable limit pin 5735 is also provided on the pull rod 5732. The limit pin 5735 is located at the front side of the rear vertical plate 5723, which can prevent the pull rod 5732 from moving backward. By separating the pull rod 5732 from the movable plate 5731, or inserting the limit pin 5735 on the pull rod 5732 without separating the pull rod 5732 from the movable plate 5731, the pull rod 5732 can be prevented from being pulled by mistake. The pull rod 5732 and the movable plate 5731 are detachable, and a pluggable limit pin 5735 is provided. Only one of the two methods can be provided.

[0053] like Figure 2 During the test, when the swinging piece 58 is moved to unfold, or during the normal use of the elevator, when the swinging piece 58 is unfolded due to the centrifugal force generated by the overspeed rotation of the rope wheel 51, the rope wheel brake 517 will be triggered, and the swing rod 5912 on the rope wheel brake 517 will swing clockwise (consistent with the rotation direction of the rope wheel 51), and the lower end of the swing rod 5912 is connected to the lower end of the first plate 591 through a spring, and the lower end of the swing rod 5912 pushes the spring, and pushes the lower end of the first plate 591 after the buffering of the spring. The first plate 591 is rotatably connected to the housing of the speed governor through the support rod 594. The support rod 594 is connected to the housing of the speed governor. Figure 2 In order to show the internal structure, the front panel of the shell is hidden. When the first plate 591 is moved clockwise, the rope pressing block 595 connected to the upper end of the first plate 591 moves toward the rope wheel 51, and the transmission rope 55 is pressed in the rope groove of the rope wheel 51.

[0054] like Fig.10 The enlarged structure of the parts near the rope pressing block 595 is shown, and the second plate 592 is arranged in parallel with the first plate 591. A accommodating cavity 593 is formed between the first plate 591 and the second plate 592. The first plate 591 is longer than the second plate 592. The first plate 591 and the second plate 592 are both sleeved on the support rod 594, the pin rod 5911 and the round rod 596, and the distance between the two can be fixed or not. In this example, the pin rod 5911 is a rod with thin ends and suddenly thickened in the middle. The two ends of the thick part in the middle are against the inner sides of the first plate 591 and the second plate 592, so that the distance between the first plate 591 and the second plate 592 is fixed.

[0055] The support rod 594 is located between the pin rod 5911 and the round rod 596. The round rod 596 is above the support rod 594, and the pin rod 5911 is below the support rod 594. The support rod 594 is connected to the housing of the speed limiter. The first plate 591 and the second plate 592 can rotate around the support rod 594.

[0056] A rod sleeve 599 is respectively provided between the first plate 591 and the second plate 592 and the support rod 594. The length of the rod sleeve 599 is greater than the thickness of the first plate 591 and the second plate 592. The rod sleeve 599 can reduce the deflection of the first plate 591 and the second plate 592 during rotation (the second plate 592 moves away from the rope wheel 51 relative to the first plate 591), which is conducive to ensuring that the pressing surface of the rope pressing block 595 and the rope wheel 51 are not deflected, increasing the pressing area of ​​the rope pressing block 595, thereby improving the rope pressing efficiency.

[0057] The outer end of the rod sleeve 599 is limited by a snap ring 5910. Fig.11 The snap ring 5910 is an elastic open ring. The structure of the opening allows the snap ring 5910 to be inserted into the outer periphery of the support rod 594. The first head 59101 and the second head 59102 are located on both sides of the opening. The first head 59101 and the second head 59102 are provided with connecting holes 59103. The two connecting holes 59103 can be connected by a pull rope (not shown in the figure). The pull rope can prevent the snap ring 5910 from being easily removed from the support rod 594. A circle of grooves 5941 are provided on the outer periphery of the support rod 594. The inner edge of the circle of the snap ring 5910 is inserted into the grooves 5941. The grooves 5941 play a role in stabilizing the snap ring 5910.

[0058] like Fig.10 The rod sleeve 599 is welded to the second plate 592 or the first plate 591 .

[0059] Pins are inserted into both ends of the round rod 596 , and the pins are respectively located outside the first plate 591 and the second plate 592 .

[0060] The rope pressing block 595 is sleeved on the portion of the round rod 596 between the first plate 591 and the second plate 592. The rope pressing block 595 is rotatable. A portion of the rope pressing block 595 is located in the accommodating chamber 593. The rope pressing block 595 extends toward the edge of the rope wheel 51. Gaskets 598 are provided on both sides of the rope pressing block 595, and the gaskets 598 are sleeved on the round rod 596. The gaskets 598 are located on both sides of the rope pressing block 595 to ensure that it is aligned with the rope groove and does not move to both sides.

[0061] The center of gravity of the rope pressing block 595 is located on the side of the vertical surface of the round rod 596 close to the rope wheel 51, that is, Fig.12 At C in the figure, the rope pressing block 595 tends to rotate clockwise.

[0062] like Fig.12 , the adjustment mechanism 597 can eliminate such a tendency so that the rope pressing block 595 is stationary. The adjustment mechanism 597 includes a fixing plate 5971, an adjustment rod 5972 and a reinforcement nut 5973. Fig.10The fixing plate 5971 is welded to the first plate 591 (it can also be welded to the second plate 592 or to both at the same time, or it can be connected by other means). Fig.12 The adjusting rod 5972 is a bolt, which is threadedly coupled to the fixing plate 5971. The lower end of the adjusting rod 5972 is pressed against the back of the rope pressing block 595 to overcome the clockwise rotation trend of the rope pressing block 595.

[0063] By rotating the adjusting rod 5972 to adjust the length of the adjusting rod 5972 extending toward the rope pressing block 595, the angle of the rope pressing block 595 can be fine-tuned, so that a gap can be maintained between the speed limiter rope pressing block 595 and the rope wheel 51, and the gap can be more uniform and will not scratch the transmission rope 55. When it is running, the transmission rope 55 will not scratch the rope pressing block 595 and will not make noise.

[0064] like Fig.12 The reinforcing nut 5973 is threadedly coupled to the adjusting rod 5972 and is tightly attached to the fixing plate 5971 to prevent the adjusting rod 5972 from loosening due to vibration.

[0065] like Fig.12 The surface of the rope pressing block 595 facing the rope wheel 51 is also provided with a contoured groove 5951, which is a long groove shape matching the shape of the transmission rope 55, so that the rope pressing block 595 and the transmission rope 55 have a larger contact area.

[0066] like Figure 2 When the swing rod 5912 swings to push the first plate 591, after the swing rod 5912 swings a certain angle, the second stopper 5914 on the rope wheel 51 will rotate clockwise due to the spring (not shown) connected thereto, blocking the right side of the first stopper 5913 on the swing rod 5912, so that the swing rod 5912 will not return to its original position, which can keep the rope pressing block 595 pressing the transmission rope 55. In order to make the second stopper 5914 rotate smoothly, the first stopper 5913 is set as a bearing ring.

[0067] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-checking elevator speed limiter, comprising a rope wheel (51), a swinging piece (58) connected to the rope wheel (51) and capable of extending outward by centrifugal force when the rope wheel (51) rotates at an overspeed, a trigger plate (510) arranged outside the swinging piece (58) and used to be moved when the swinging piece (58) extends outward, a switch plate (511) connected to the trigger plate (510), and an electrical switch (56) that can be turned off by the switch plate (511), wherein the swinging piece (58) is provided with a pushing mechanism (512), the trigger plate (510) is provided with a first trigger part (5101), the trigger plate (510) can be passively swung toward the center of the rope wheel (51) so that the first trigger part (5101) can touch the pushing mechanism (512) during self-checking, and characterized in that: The device further comprises a blocking plate (513), wherein the blocking plate (513) is connected to the trigger plate (510) in a relatively sliding manner, and the blocking plate (513) has a blocking head (5131), wherein the blocking head (5131) protrudes from the surface of the first trigger portion (5101) facing the pushing mechanism (512), and the swinging piece (58) is configured to be extended outward when the pushing mechanism (512) is pushed by the blocking head (5131).

2. The self-checking elevator speed governor according to claim 1 is characterized in that: It also includes a damping structure (514), wherein the damping structure (514) is connected to the blocking plate (513) so as to cause the blocking head (5131) to protrude from the first triggering portion (5101) toward the surface of the pushing mechanism (512).

3. The self-checking elevator speed governor according to claim 2 is characterized in that: The damping structure (514) is a bent rod (514a) connected to the blocking plate (513) and capable of deformation.

4. The self-checking elevator speed governor according to claim 3 is characterized in that: One end of the curved rod (514a) away from the blocking plate (513) is rotatably connected to the fixed rod (515).

5. The self-checking elevator speed governor according to claim 4 is characterized in that: The fixing rod (515) is located at the periphery of the rope wheel (51) to serve as a rope stop.

6. The self-checking elevator speed governor according to claim 3 is characterized in that: The curved rod (514a) has elasticity, and after being squeezed and deformed, the curved rod (514a) can recover using its own elasticity after the squeezing force is released.

7. The self-checking elevator speed governor according to claim 2 is characterized in that: The damping structure (514) is a spring connected to the blocking plate (513).

8. The self-checking elevator speed governor according to claim 1 is characterized in that: The trigger plate (510) is provided with a long slot (5102), and the blocking plate (513) is provided with a latch (5132), the latch (5132) is inserted into the long slot (5102), and the extension direction of the long slot (5102) is substantially consistent with the direction in which the blocking head (5131) protrudes from the first trigger part (5101).

9. The self-checking elevator speed governor according to claim 1, characterized in that: The pushing mechanism (512) comprises a first pushing member (5121) and a second pushing member (5122), wherein the first pushing member (5121) corresponds to the blocking head (5131), and the second pushing member (5122) corresponds to the first triggering portion (5101), and the first pushing member (5121) protrudes forward in its own rotation direction relative to the second pushing member (5122).

10. The self-checking elevator speed governor according to claim 1, characterized in that: The auxiliary touch plate (516) further comprises a second trigger portion (5161) and a toggle portion (5162). The auxiliary touch plate (516) is connected to the trigger plate (510) and can move toward the center of the rope wheel (51) together with the trigger plate (510) during self-test. The second trigger portion (5161) is closer to the oncoming pushing mechanism (512) relative to the blocking head (5131). The second trigger portion (5161) is configured to touch the pushing mechanism (512) during self-test and swing the pushing mechanism (512). The swing causes the toggle portion (5162) to close the electrical switch (56).

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