Elevator overspeed governor

Abstract

The application discloses an elevator speed limiter, which comprises a plumb shaft for driving the rotation of the elevator speed limiter; a speed detection mechanism for detecting the speed of an elevator car, which is sleeved on the plumb shaft and synchronously rotates with the plumb shaft; and a spring stroke adjusting mechanism, which is sleeved on the plumb shaft and arranged inside the speed detection mechanism; the spring stroke adjusting mechanism is connected with the plumb shaft through a one-way bearing so that the spring stroke adjusting mechanism rotates with the plumb shaft only when the elevator is descending. The speed limiter comprises a set of speed detection mechanism and a set of spring stroke adjusting mechanism, and can realize different speeds of the elevator when ascending and descending, achieve the purpose of detecting the overspeed behavior when ascending and descending respectively and stopping the elevator.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elevators, in particular to an elevator overspeed governor. BACKGROUND

[0002] The elevator overspeed governor is one of the safety control components in the elevator safety protection system. When the elevator is running and the car is overspeeding due to any reason, even in the case of falling danger, and all other safety protection devices do not work, the overspeed governor and the safety gear will act together to stop the elevator car.

[0003] In the prior art, patent CN201280073318.1 has two independent speed detection mechanisms for the elevator car running up and down, and has different trigger speeds. The disclosed technology has the following problems: first, the two sets of detection mechanism bodies are isolated or transmitted by the pawl, which has large noise and poor stability during high-speed operation; second, two sets of detection mechanisms and action trigger mechanisms are used, which has a large axial size and is not conducive to the layout of the elevator machine room. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an elevator overspeed governor containing only one set of speed detection mechanism, which reduces the installation size in the axial direction and can be used for more compact elevator machine room layout.

[0005] To solve the above technical problems, the present application provides an elevator overspeed governor, comprising:

[0006] A plumb shaft for driving the rotation of the elevator overspeed governor;

[0007] A speed detection mechanism for detecting the speed of the elevator car, the speed detection mechanism is sleeved on the plumb shaft and rotates synchronously with the plumb shaft;

[0008] A spring stroke adjusting mechanism is sleeved on the plumb shaft and arranged inside the speed detection mechanism; the spring stroke adjusting mechanism is connected with the plumb shaft through a one-way bearing so that the spring stroke adjusting mechanism rotates with the plumb shaft only when the elevator is descending.

[0009] Preferably, the speed detection mechanism comprises a first connecting rod mechanism, a first weight and a first spring;

[0010] The first connecting rod mechanism is sleeved on the plumb shaft and rotates synchronously with the plumb shaft;

[0011] The first weight is fixed on the first connecting rod mechanism;

[0012] When the first connecting rod mechanism rotates, the first weight generates centrifugal force and drives the first connecting rod mechanism to compress the first spring to generate displacement.

[0013] Preferably, the speed detection mechanism comprises a first upper crossbar, a first lower crossbar, a pair of first swing arms, a pair of first weights, and a first spring, wherein:

[0014] The first upper crossbar is arranged above the second upper crossbar and fixed on the plumb shaft; the first lower crossbar is arranged below the second lower crossbar and can slide axially relative to the plumb shaft; the first weight is fixed on the first swing arm; the first swing arm is hinged to the first upper crossbar and the first lower crossbar; and the first spring is arranged between the first lower crossbar and the second lower crossbar.

[0015] Preferably, the spring stroke adjustment mechanism comprises a second connecting rod mechanism, a second weight, and a second spring.

[0016] The second connecting rod mechanism is connected to the plumb shaft through a one-way bearing so that the spring stroke adjustment mechanism rotates together with the plumb shaft only when the elevator is descending; the second weight is fixed on the second connecting rod mechanism; and when the second connecting rod mechanism rotates, the second weight generates centrifugal force and drives the second connecting rod mechanism to compress the second spring to generate displacement.

[0017] Preferably, the spring stroke adjustment mechanism comprises a second upper crossbar, a second lower crossbar, a pair of second swing arms, a pair of second weights, and a second spring, wherein:

[0018] The second upper crossbar and the second lower crossbar are connected to the plumb shaft through a one-way bearing and a sliding bearing respectively, and rotate together with the plumb shaft only when the elevator is descending;

[0019] The second upper crossbar is fixed in axial position, and the second lower crossbar can slide axially relative to the plumb shaft;

[0020] The second weight is fixed on the second swing arm, and the second swing arm is hinged to the second upper crossbar and the second lower crossbar;

[0021] The second spring is arranged between the second lower crossbar and the spring stroke adjustment mechanism.

[0022] Preferably, the brake action mechanism is further provided, and when the speed detection mechanism detects that the ascending speed or the descending speed of the car exceeds a preset value, the brake action mechanism starts to act.

[0023] Preferably, the brake action mechanism comprises a shaft sleeve, a second swing arm, an action rod, a bracket, and a first swing arm, wherein: the shaft sleeve is connected to the speed detection mechanism through a bearing, keeps axial displacement consistent, and can rotate relative to the speed detection mechanism; the shaft sleeve is hinged to the second swing arm, the second swing arm has the first swing arm and the action rod hinged to the two ends respectively, the first swing arm is hinged to the bracket, and the bracket is fixedly arranged on the speed limiting device gear box.

[0024] Preferably, when the speed detection mechanism drives the bushing to move upward, the actuating rod is displaced upward. When the displacement of the actuating rod reaches the second displacement S1, the electrical switch is triggered to activate the brake and restrict the movement of the car. When the displacement of the actuating rod reaches the first displacement S2, the rope clamping device is triggered to clamp the speed regulator rope and pull the car safety clamp to stop the elevator car.

[0025] The technical advantages of this invention are as follows: 1) Only one speed detection mechanism is used, reducing the axial installation size. It can be used for more compact elevator machine room layouts.

[0026] 2) Only one set of one-way bearings is configured on the spring stroke adjustment structure. When the elevator goes up (at a faster speed), the one-way bearings rotate freely and when the elevator goes down (at a slower speed), the one-way bearings lock up, which can increase the stability of operation and reduce the noise of operation.

[0027] The speed limiter of this invention comprises a speed detection mechanism and a spring travel adjustment mechanism, enabling it to detect and stop the elevator car when the elevator's upward and downward speeds differ. The speed detection mechanism rotates synchronously with the sheave. The spring travel adjustment mechanism is equipped with a one-way bearing, ensuring that it rotates synchronously with the sheave in only one direction during elevator movement. This results in different operating states and output spring forces during upward and downward movements. The spring force acts on the speed detection mechanism. By adjusting the spring force, the speed limiter can trigger the car-stopping mechanism when the elevator reaches its corresponding overspeed during both upward and downward movements. Furthermore, when the upward speed does not exceed the overspeed threshold (but exceeds the downward speed threshold), the speed limiter will not malfunction. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the elevator speed governor of the present invention.

[0029] Figure 2 This is an enlarged schematic diagram of the elevator speed limiter of the present invention. Detailed Implementation

[0030] like Figures 1-2 As shown, the present invention is an elevator speed limiter, which includes a speed detection mechanism 3 and a spring travel adjustment mechanism 4.

[0031] like Figure 1 As shown, when the car is going up or down, the car drives the speed limiter rope wheel 1 to rotate through the speed limiter wire rope (not shown in the figure). The speed limiter rope wheel 1 drives the plumb shaft 2 to rotate through the bevel gear pair. The speed of the plumb shaft 2 is consistent with that of the speed limiter rope wheel 1.

[0032] like Figure 2As shown, the speed detection mechanism 3 includes a first linkage mechanism, a first weight 34 and a first spring; the first linkage mechanism is sleeved on the plumb shaft 2 and rotates synchronously with the plumb shaft 2; the first weight 34 is fixed on the first linkage mechanism; the first weight generates centrifugal force when the first linkage mechanism rotates and drives the first linkage mechanism to compress the first spring 6 to generate displacement.

[0033] Specifically, the first linkage mechanism includes a first upper crossbar 31, a first lower crossbar 32 and a pair of first swing arms 33. The first upper crossbar 31 is arranged above the second upper crossbar 41 and fixed on the plumb shaft 2, the first lower crossbar 32 is arranged below the second lower crossbar 42 and can slide axially relative to the plumb shaft 2; the first weight 34 is fixed on the first swing arm 33, the first swing arm 33 is hinged with the first upper crossbar 31 and the first lower crossbar 32; the first spring 6 is arranged between the first lower crossbar 32 and the second lower crossbar 42; the upper end of the first spring 6 is arranged on the second lower crossbar 42, and the lower end of the first spring 6 is arranged on the first lower crossbar 32.

[0034] The spring stroke adjustment mechanism 4 includes a second linkage mechanism, a second weight 43 and a second spring 7;

[0035] The second linkage mechanism is connected with the plumb shaft 2 through a one-way bearing so that the spring stroke adjustment mechanism 4 rotates with the plumb shaft 2 only when the elevator is descending;

[0036] The second weight 43 is fixed on the second linkage mechanism;

[0037] The second weight generates centrifugal force when the second linkage mechanism rotates and drives the second linkage mechanism to compress the second spring 7 to generate displacement.

[0038] Specifically, the second linkage mechanism includes a second upper crossbar 41, a second lower crossbar 42 and a pair of second swing arms 44. The second upper crossbar 41 is connected with the plumb shaft 2 through a one-way bearing 45 and rotates with the plumb shaft 2 only when the elevator is descending, wherein the second upper crossbar 41 is fixed in axial position and the second lower crossbar 42 can slide axially relative; the second weight 43 is fixed on the second swing arm 44, the second swing arm 44 is hinged with the second upper crossbar 41 and the second lower crossbar 42; the second spring 7 is arranged between the second lower crossbar 42 and the spring stroke adjustment mechanism; the upper end of the second spring 7 is fixed between the second upper crossbar 41 and the second lower crossbar 42, and the lower end of the second spring 7 is arranged on the second lower crossbar 42.

[0039] The one-way bearing 45 is a bearing that can rotate freely (at this time, no torque is transmitted) in one direction, and is locked (at this time, torque can be transmitted) in the other direction.

[0040] The elevator speed limiter of the present application can also include a brake action mechanism 5, which starts to act when the speed detection mechanism 3 detects that the speed of the car exceeds the preset value.

[0041] The brake action mechanism 5 includes a shaft sleeve 51, a second rocker arm 52, an action lever 53, a bracket 54 and a first rocker arm 55.

[0042] The first lower crossbar 32 of the speed detection mechanism 3 is connected with the shaft sleeve 51 of the brake action mechanism through a bearing, keeping the axial displacement consistent and allowing relative rotation. The shaft sleeve 51 is hinged to the rocker arm 52, the ends of the rocker arm 52 are respectively hinged to the first rocker arm 55 and the action lever 53, the first rocker arm 55 is hinged to the bracket 54, and the bracket 54 is fixedly arranged on the speed limiter gear box (not shown in the figure). When the first lower crossbar 32 drives the shaft sleeve 51 to move upward, it will cause the action lever 53 to have upward displacement. When the displacement of the action lever 53 reaches the second displacement S1, it will trigger the corresponding electrical switch (not shown in the figure) to act, thereby causing the brake to be clamped, limiting the movement of the car. When the displacement of the action lever 53 reaches the first displacement S2, it will trigger the rope clamping device to act, clamping the speed limiter wire rope, thereby pulling the car safety gear to act and stopping the elevator car.

[0043] The different running speeds of the elevator in up and down directions will be described below.

[0044] When the elevator runs upward at the rated speed V0, the second overspeed V1 (triggering the brake to be clamped when overspeed) is set. When the elevator runs downward at the rated speed V0', the second overspeed V1' (triggering the brake to be clamped when overspeed) and the first overspeed V2' (triggering the safety gear to act when overspeed) are set.

[0045] Generally, V0' < V1' < V2' < V0 < V1.

[0046] When the elevator runs downward, the speed limiter sheave drives the plumb shaft 2 to rotate, driving the two centrifugal mechanisms of different sizes to be mutually embedded in the plumb shaft 2 to rotate, the first weight 34 moves outward under the action of centrifugal force, and the first lower crossbar 32 needs to move upward against the pressure of the first spring 6.

[0047] A one-way bearing 45 is arranged between the second lower crossbar 42 and the plumb shaft 2. The one-way bearing is a bearing that can freely rotate in one direction (at this time, no torque is transmitted) and is locked in the other direction (at this time, torque can be transmitted).

[0048] Under the action of the one-way bearing, the second upper cross bar 41 rotates, the second weight 43 moves outward under the action of centrifugal force, and the second lower cross bar 42 moves upward against the pressure of the second spring 7. With the increase of the elevator speed, when the elevator speed reaches the second overspeed speed V1', the centrifugal force drives the upward movement of the first lower cross bar 32, and the force is recorded as F1', which drives the action rod 53 to reach the second displacement S1, and triggers the corresponding electrical switch action. At this time, the displacement of the first lower cross bar 32 is X1', and the displacement of the second lower cross bar 42 is X2'. The spring force of the first spring 6 is F6'= K6(X2'- X1'). When the elevator speed continues to increase to the first overspeed speed V2', the centrifugal force drives the upward movement of the first lower cross bar 32, and the force is recorded as F2', which drives the action rod 53 to reach the first displacement S2, and triggers the car safety gear action. At this time, the displacement of the first lower cross bar 32 is X1'', and the displacement of the second lower cross bar 42 is X2''. The spring force of the first spring 6 is F6''= K6(X1''- X2'').

[0049] When the elevator is ascending, the speed detector mechanism is rotated by the speed governor sheave, the first weight 34 moves outward under the action of centrifugal force, and the first lower cross bar 32 moves upward against the pressure of the first spring 6. Since the second upper cross bar 41 of the spring travel adjusting mechanism is connected with the plumb shaft 2 through the one-way bearing, the second upper cross bar 41 of the spring travel adjusting mechanism does not rotate with the plumb shaft 2 in the ascending state, the second weight 43 is not affected by the centrifugal force, the position of the second lower cross bar 42 is almost unchanged, and only moves a small displacement X2 upward under the action of the first spring 6.

[0050] Obviously, X2<< X2'< X2''.

[0051] When the elevator ascending speed reaches the descending second overspeed speed V1' and the first overspeed speed V2', since X2<< X2'< X2'', the spring force F6 of the first spring 6 required to trigger the electrical switch action is F6= K6(X1'- X2)> F6'> F6''. At this time, the centrifugal forces F1' and F2' of the first weight 34 are insufficient to overcome the action of the spring force F6, and the electrical switch and the car safety gear cannot be triggered. With the increase of the elevator speed, when the elevator speed reaches the ascending second overspeed speed V1, the centrifugal force F1 of the first weight 34 increases, and through reasonable design of the stiffness of the first spring 6 and the second spring 7, F1= F6 at this time can be achieved, so that when the elevator speed reaches the ascending second overspeed speed V1, the electrical switch action is triggered, and the car is stopped by the brake.

Claims

1. An elevator speed governor, characterized in that, include: A plumb shaft (2) is used to drive the elevator speed limiter to rotate. Speed ​​detection mechanism (3) is used to detect the speed of the elevator car. The speed detection mechanism (3) is sleeved on the plumb shaft (2) and rotates synchronously with the plumb shaft (2). A spring travel adjustment mechanism (4) is sleeved on the plumb shaft (2) and disposed inside the speed detection mechanism (3); the spring travel adjustment mechanism (4) is connected to the plumb shaft (2) through a one-way bearing (45) so that the spring travel adjustment mechanism (4) rotates together with the plumb shaft (2) only when the elevator is going down. The spring stroke adjustment mechanism (4) includes a second linkage mechanism, a second weight (43), and a second spring (7). The second linkage mechanism is connected to the plumb shaft (2) via a one-way bearing (45) so that the spring stroke adjustment mechanism (4) rotates together with the plumb shaft (2) only when the elevator is going down. The second weight (43) is fixed on the second linkage mechanism; When the second linkage rotates, the second weight (43) generates centrifugal force and drives the second linkage to compress the second spring (7) to generate displacement.

2. The elevator speed governor as described in claim 1, characterized in that, The speed detection mechanism (3) includes a first linkage mechanism, a first weight (34), and a first spring; The first linkage mechanism is sleeved on the plumb shaft (2) and rotates synchronously with the plumb shaft (2); The first weight (34) is fixed on the first linkage mechanism; When the first linkage rotates, the first weight generates centrifugal force and drives the first linkage to compress the first spring (6) to generate displacement.

3. The elevator speed governor as described in claim 1, characterized in that, The speed detection mechanism (3) includes a first upper crossbar (31), a first lower crossbar (32), a pair of first swing arms (33), a pair of first weights (34), and a first spring (6), wherein: The first upper crossbar (31) is set above the second upper crossbar (41) and fixed on the plumb shaft (2); The first lower crossbar (32) is located below the second lower crossbar (42) and slides relative to it along the axial direction of the plumb bob shaft (2); The first weight (34) is fixed on the first swing arm (33); The first swing arm (33) is hinged to the first upper crossbar (31) and the first lower crossbar (32); The first spring (6) is located between the first lower crossbar (32) and the second lower crossbar (42).

4. The elevator speed governor as described in claim 1, characterized in that, The spring stroke adjustment mechanism (4) includes a second upper crossbar (41), a second lower crossbar (42), a pair of second swing arms (44), a pair of second weights (43), and a second spring (7), wherein: The second upper crossbar (41) and the second lower crossbar (42) are connected to the plumb shaft (2) through a one-way bearing and a sliding bearing, respectively, and rotate only when the elevator is going down, driven by the plumb shaft (2). The second upper crossbar (41) is fixed in the axial position, and the second lower crossbar (42) slides axially relative to each other; The second weight (43) is fixed on the second swing arm (44), and the second swing arm (44) is hinged to the second upper crossbar (41) and the second lower crossbar (42); The second spring (7) is located between the second lower crossbar (42) and the spring stroke adjustment mechanism.

5. The elevator speed governor as described in claim 1, characterized in that, It also includes the braking mechanism. When the speed detection mechanism (3) detects that the car's upward or downward speed exceeds a preset value, the braking mechanism starts to operate.

6. The elevator speed governor as described in claim 5, characterized in that, The braking mechanism includes a bushing (51), a second rocker arm (52), an actuating rod (53), a bracket (54), and a first rocker arm (55), wherein: The bushing (51) is connected to the speed detection mechanism (3) through a bearing, maintaining consistent axial displacement and relative rotation; the bushing (51) is hinged to the second rocker arm (52), and the two ends of the second rocker arm (52) are respectively hinged to the first rocker arm (55) and the action rod (53). The first rocker arm (55) is hinged to the bracket (54), and the bracket (54) is fixedly installed on the gearbox of the speed limiting device.

7. The elevator speed governor as described in claim 6, characterized in that, When the speed detection mechanism (3) drives the bushing (51) to move upward, the action rod (53) moves upward. When the displacement of the action rod (53) reaches the second displacement S1, the electrical switch is triggered to activate the brake and restrict the car's movement. When the displacement of the action rod (53) reaches the first displacement S2, the rope clamping device is triggered to clamp the speed regulator rope and pull the car safety clamp to stop the elevator car.

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