Speed governor

Abstract

The speed limiter comprises a base frame, a wheel shaft fixedly installed on the base frame and a rope wheel rotationally installed on the wheel shaft, the rope wheel is provided with a centrifugal mechanism, and the centrifugal mechanism comprises two centrifugal flail blocks which are located on the two sides of the wheel shaft respectively. The centrifugal throwing block is provided with a rotating end and a throwing-out end, and the rotating end is rotationally connected to the rope wheel. The distance between the rotating fulcrums of the two centrifugal flail blocks is smaller than the distance between the mass center points of the two centrifugal flail blocks. According to the speed limiter, due to the fact that the distance between the rotating fulcrums of the two centrifugal flail blocks is smaller than the distance between the mass center points of the two centrifugal flail blocks, compared with an existing mode that the rotating fulcrums of the two centrifugal flail blocks are symmetrically distributed on the two sides of the rope wheel shaft of the speed limiter, the speed limiter is triggered instantly when a lift car falls and weightlessness occurs, response is faster, and safety and reliability of braking of a safety protection device are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of elevator accessories, and in particular relates to a speed governor. Background Art

[0002] The two centrifugal blocks and their rotation fulcrums of the existing centrifugal mechanism of the speed limiter are symmetrically distributed on both sides of the speed limiter rope sheave axle. The speed limiter is set to adjust the action speed at a lower acceleration when it leaves the factory, and the maximum action speed of the safety clamp is set according to the action speed greater than 1.25 times the rated speed of the elevator. However, in the fall protection condition, when falling at an acceleration far greater than the debugged acceleration, the dynamic mechanical action speed of the speed limiter is delayed and increased, causing the action speed of the safety protection device to increase and affect the braking reliability of the protection device. The new standard GB / T 7588 stipulates: In order to ensure that the speed limiter is actuated before reaching the dangerous speed, the maximum distance between the action points of the speed limiter that triggers the progressive safety clamp corresponding to the movement of the speed limiter rope should not be greater than 250mm. The maximum distance between the action points of the speed limiter that triggers the instantaneous safety clamp corresponding to the movement of the speed limiter rope should not be greater than 100mm. It is particularly important to solve the rapid response of the speed limiter under actual working conditions and improve the reliability of the safety protection system. Therefore, there is an urgent need to improve the structure of the speed limiter in this field. Utility Model Content

[0003] Based on the above-mentioned shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a speed governor and an elevator.

[0004] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0005] A speed governor comprises a base frame, a wheel shaft fixedly mounted on the base frame and a rope pulley rotatably mounted on the wheel shaft, wherein the rope pulley is provided with a centrifugal mechanism, wherein the centrifugal mechanism comprises two centrifugal throw blocks, which are respectively located on both sides of the wheel shaft;

[0006] The centrifugal throwing block has a rotating end and a throwing end, and the rotating end is rotatably connected to the rope wheel;

[0007] The distance between the rotation fulcrums of the two centrifugal throwing blocks is smaller than the distance between the mass centers of the two centrifugal throwing blocks.

[0008] As a preferred embodiment, the rotation fulcrums of the two centrifugal blocks are the same rotation fulcrum; or, the rotation ends of the two centrifugal blocks are adjacent and connected by a connecting arm, the connecting line of the two centrifugal block rotation fulcrums is located on one side of the wheel axle, and the rotation fulcrums of the two centrifugal blocks are respectively located on both sides of the connecting arm.

[0009] As a preferred solution, the rope wheel is braked by using the ratchet wheel and the pawl of the centrifugal block or their linked pawls.

[0010] As a preferred solution, the wheel shaft is coaxially provided with a brake disc, the rope pulley is provided with a trigger brake cam, and the trigger brake cam is rotatably matched with the rope pulley;

[0011] A speed regulating member is provided between the throwing end of one centrifugal throwing block and the rope wheel, and the speed regulating member is used to adjust the speed limit of the speed limiter, and the throwing end of the other centrifugal throwing block is connected to the trigger brake cam;

[0012] When the speed limiter is in an overspeed state, the ejection end of the centrifugal throw weight is linked to trigger the brake cam to rotate to fit the brake disc to achieve rope wheel braking.

[0013] As a preferred solution, the trigger brake cam is an eccentric cam.

[0014] As a preferred solution, a brake limiting protrusion is provided outside the trigger brake cam, which is used to limit the braking stroke after the trigger brake cam is in contact with the brake disc.

[0015] As a preferred solution, a limit pin is provided outside the trigger brake cam, and correspondingly, the rope wheel is provided with a reset stroke limit column;

[0016] When the speed limiter is in the reset state, the throwing end of the centrifugal throwing block is reset, and the brake cam is triggered to rotate in the opposite direction through the linkage arm until the limit pin contacts or has clearance fit with the reset stroke limit column.

[0017] As a preferred solution, a sealing ring is provided on the end surface of the brake disc.

[0018] As a preferred solution, a switch plate and a reverse switch plate are respectively provided on the two centrifugal swing blocks, which are respectively used to trigger the speed limiter switch installed on the base frame.

[0019] As a preferred solution, the switch plate and the reverse switch plate are symmetrically distributed on both sides of the brake disc, and the outer sides of the switch plate and the reverse switch plate have arc-shaped trigger surfaces;

[0020] The inner sides of the switch plate and the reverse switch plate are provided with tracks extending along the circumferential direction of the wheel axle, and the tracks are inclined surfaces or arc surfaces;

[0021] The base frame is provided with a manual trigger, and when the manual trigger is pressed down to contact the track, the manual trigger drives the centrifugal block to open, and triggers the brake cam to rotate to fit the brake disc through the linkage arm to achieve rope wheel braking;

[0022] The manual trigger member includes a pressing pin shaft, a reset spring and a trigger pin. The reset spring is sleeved on the head of the pressing pin shaft and the boss of the base frame. The trigger pin is fixedly installed on the head of the pressing pin shaft and extends above the track so that the trigger pin contacts the track after the pressing pin shaft is pressed down.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The speed limiter of the utility model has a smaller spacing between the rotation fulcrums of the two centrifugal swing blocks than between the mass centers of the two centrifugal swing blocks, and is symmetrically distributed on both sides of the sheave axle of the speed limiter compared with the existing two centrifugal swing blocks. It is triggered instantaneously when the car falls and loses weight, and responds more quickly, thereby improving the safety and reliability of the braking of the safety protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the speed limiter of Example 1 of the utility model in an ultrasonic state;

[0026] Figure 2 It is a rear view structural schematic diagram of the speed limiter of Embodiment 1 of the utility model;

[0027] Figure 3 It is a schematic structural diagram of a base frame of Example 1 of the utility model;

[0028] Figure 4 1 is a front structural schematic diagram of a speed limiter according to Embodiment 1 of the present utility model;

[0029] Figure 5 yes Figure 4 AA section view in the figure;

[0030] Figure 6 yes Figure 5 A magnified view of part B in FIG.

[0031] Figure 7 It is a structural schematic diagram of the centrifugal mechanism of Example 1 of the utility model;

[0032] Figure 8 It is a structural schematic diagram of the centrifugal mechanism of Example 1 of the utility model (the centrifugal throwing block is shown on the left);

[0033] Fig. 9 It is a structural schematic diagram of the manual trigger member and the reverse switch plate of Example 1 of the utility model;

[0034] Fig.10 It is a structural schematic diagram of the trigger brake cam of Example 1 of the utility model;

[0035] Fig.11 It is a structural schematic diagram of the speed limiter of Example 1 of the utility model in a reset state. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the embodiments of the utility model, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0037] Embodiment 1:

[0038] like Figure 1-11 As shown, the speed limiter of this embodiment includes a base frame 1, a wheel axle 2, a rope pulley 3, a brake disc 4, a centrifugal mechanism 5, a speed regulating member 6, a trigger brake cam 7 and a speed limiter switch 8.

[0039] Specifically, the base frame 1 includes a base and a front vertical plate 11 and a rear vertical plate 12 installed on the base, and the front vertical plate 11 and the rear vertical plate 12 are spaced from front to back to form an installation space for components such as a rope pulley and a brake disc. In addition, a left protective plate and a right protective plate 13 are installed on the base to avoid the rotation of the rope pulley 3 and to protect the speed limiter switch 8 installed at the bottom of the front vertical plate 11 to prevent false triggering and interference by foreign objects.

[0040] The axle 2 of this embodiment is suspended and installed between the front vertical plate 11 and the rear vertical plate 12. The axle 2 is sleeved with the rope pulley 3, brake disc 4, disc spring 9 and locking nut M in sequence along its axial direction. Among them, the rope pulley 3 is rotatably installed on the axle 2 through a bearing, and the inner ring of the bearing is in contact with the rear vertical plate 12 through a spacer. The brake disc 4 is coaxially installed on the axle 2 and is located on the front side of the rope pulley 3. The outer peripheral surface of the brake disc 4 has a straight knurling structure to improve the stability of braking. In addition, the front side of the brake disc 4 is concave along its axial direction to form an installation groove 40. The rear side of the brake disc 4 and the installation groove 40 on the front side are respectively installed with friction plates S. The friction plates S are sleeved outside the axle 2. The outer periphery of the friction plate S on the rear side is installed with a sealing ring O (located on the end face of the brake disc 4) to prevent foreign matter from entering and affecting the friction between the friction plate and the brake disc. In addition, the friction plate on the rear side of the brake disc abuts against the front side of the boss of the wheel axle 2 through a gasket, and the front side of the friction plate on the front side of the brake disc abuts against the rear side of the disc spring 9 through a gasket. The front side of the disc spring 9 is fastened by a locking nut M threadedly installed on the wheel axle 2.

[0041] The centrifugal mechanism 5 of this embodiment is installed on the front side of the rope wheel 3. The centrifugal mechanism 5 includes two centrifugal throwing blocks 50 and a connecting arm 51 installed between the two centrifugal throwing blocks. The centrifugal throwing block 50 is a gun-type handle-shaped structure, and the two ends are respectively a rotating end 501 and a throwing end 502. The rotating end 501 is rotatably connected to the rope wheel 3, and the centrifugal throwing block 50 can rotate around the rotating fulcrum to realize the throwing end 502. The two centrifugal throwing blocks are symmetrically distributed on both sides of the brake disc 4. A speed regulating member 6 is arranged between the throwing end at the top of the left centrifugal throwing block and the rope wheel 2. The speed regulating member 6 is used to adjust the speed limit of the speed limiter. The specific structure of the speed regulating member 6 can refer to the prior art and is not repeated here; the throwing end at the top of the right centrifugal throwing block is connected to the trigger brake cam 7 through a linkage arm L, and the trigger brake cam 7 is rotatably installed on the front side of the rope wheel 3. Specifically, the trigger brake cam 7 is an eccentric cam. When the eccentric cam rotates, the eccentric cam can be brought into contact with or out of contact with the brake disc 4, thereby achieving braking or brake release.

[0042] Among them, along the circumferential direction of the brake disc 4, the rotating ends 501 of the centrifugal blocks on the left and right sides are adjacent and connected by a connecting arm 51, the connecting line of the rotation fulcrums of the two centrifugal blocks is located on the same side of the wheel axle 2, and the rotation fulcrums of the two centrifugal blocks are respectively located on both sides of the connecting arm 51, so as to realize the linkage cooperation of the two centrifugal blocks; wherein, the spacing between the rotation fulcrums of the two centrifugal blocks is smaller than the spacing between the center of mass of the two centrifugal blocks. Such a design can effectively improve the response speed of the centrifugal mechanism.

[0043] When the speed limiter is in an overspeed state, the ejected end of the centrifugal throw weight triggers the brake cam 7 to rotate to fit the brake disc 4 through the linkage arm L, so as to achieve braking of the rope wheel 3.

[0044] The trigger brake cam 7 of this embodiment has a brake limit protrusion 71 outside, which is used to limit the brake stroke after the trigger brake cam 7 is attached to the brake disc 4. In addition, a limit pin 72 is provided outside the trigger brake cam 7, and correspondingly, the rope wheel 3 is provided with a reset stroke limit column 31; when the speed limiter is in the reset state, the throwing end of the centrifugal throw block is reset, and the trigger brake cam 7 is linked by the linkage arm L to rotate in the opposite direction until the limit pin 72 contacts or has a clearance fit with the reset stroke limit column 31.

[0045] The centrifugal block 50 of this embodiment is provided with a counterweight 52 to enhance the stability of the centrifugal mechanism. In addition, the two centrifugal blocks are also provided with a switch plate 53 and a reverse switch plate 54, respectively, which are used to trigger the speed limiter switch 8 installed on the base frame. Specifically, the switch plate 53 and the reverse switch plate 54 are symmetrically distributed on both sides of the brake disc 4, and the outer sides of the switch plate 53 and the reverse switch plate 54 have an arc-shaped trigger surface H. When the centrifugal block is opened, the arc-shaped trigger surface H can trigger the speed limiter switch 8.

[0046] Since the speed limiter of this embodiment is applied to the speed limiter in the machine room, a manual trigger function is also required. The inner side of the switch plate 53 and the reverse switch plate 54 of this embodiment has a track G extending along the circumferential direction of the wheel axle, and the track G is an arc surface; accordingly, the front vertical plate 11 of the base frame is installed with a manual trigger member K. When the manual trigger member K is pressed down to contact the track G, the arc track G rotating with the rope wheel interacts with the manual trigger member K, thereby driving the centrifugal block of the centrifugal mechanism to unfold, and the brake cam 7 is triggered to rotate to fit the brake disc 4 through the linkage arm L to realize manual braking of the rope wheel.

[0047] Specifically, the manual trigger component K includes a pressing pin shaft K1, a return spring K2 and a trigger pin K3. The return spring K2 is sleeved on the head of the pressing pin shaft K1 and a horizontal boss 110 extending outward from the front vertical plate 11. The trigger pin K3 is fixedly installed on the head of the pressing pin shaft K1 and extends to the top of the track G, so that after the pressing pin shaft K1 is pressed down, the trigger pin K3 contacts the track G to realize manual triggering.

[0048] The present embodiment also provides an elevator, which adopts the above-mentioned speed limiter and can be triggered instantly when the car falls and loses weight, thereby effectively improving the safety of the car.

[0049] Embodiment 2:

[0050] The speed limiter of this embodiment is different from that of Embodiment 1 in that:

[0051] The manual trigger K can be remotely triggered by an electromagnet, and the switch uses an automatic reset switch to achieve the matching use of a machine room-less elevator.

[0052] The track of the switch plate or reverse switch plate is inclined to meet the needs of different applications;

[0053] For other structures, please refer to Example 1.

[0054] Embodiment 3:

[0055] The speed limiter of this embodiment is different from that of Embodiment 1 in that:

[0056] The two centrifugal swing blocks have the same rotation fulcrum, omitting the connecting arm and simplifying the structure to meet the needs of different applications.

[0057] For other structures, please refer to Example 1.

[0058] Embodiment 4:

[0059] The speed limiter of this embodiment is different from that of Embodiment 1 in that:

[0060] The existing ratchet wheel and the pawl of the centrifugal block or the pawl thereof in linkage are used to realize the rope wheel braking to replace the brake disc braking structure of the first embodiment, so as to meet the requirements of different applications; the cooperation between the ratchet wheel and the pawl can refer to the existing technology, which will not be described in detail here;

[0061] For other structures, please refer to Example 1.

[0062] Embodiment 5:

[0063] The speed limiter of this embodiment is different from that of Embodiment 1 in that:

[0064] It adopts the method without friction plate, that is, the conventional traction friction type, which is lower in cost and meets the needs of different applications;

[0065] For other structures, please refer to Example 1.

[0066] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, according to the ideas provided by the present invention, there will be changes in the specific implementation methods, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A speed governor, comprising a base frame, a wheel shaft fixedly mounted on the base frame and a rope pulley rotatably mounted on the wheel shaft, wherein the rope pulley is provided with a centrifugal mechanism, characterized in that: The centrifugal mechanism includes two centrifugal throwing blocks, which are respectively located on both sides of the wheel axle; The centrifugal throwing block has a rotating end and a throwing end, and the rotating end is rotatably connected to the rope wheel; The distance between the rotation fulcrums of the two centrifugal throwing blocks is smaller than the distance between the mass centers of the two centrifugal throwing blocks.

2. The speed limiter according to claim 1, characterized in that: The rotation fulcrums of the two centrifugal blocks are the same rotation fulcrum; or, the rotation ends of the two centrifugal blocks are adjacent and connected by a connecting arm, the connecting line of the two centrifugal block rotation fulcrums is located on one side of the wheel axle, and the rotation fulcrums of the two centrifugal blocks are respectively located on both sides of the connecting arm.

3. The speed limiter according to claim 1, characterized in that: The rope wheel is braked by using the ratchet wheel and the ratchet of the centrifugal throwing block or the ratchet linked thereto.

4. The speed limiter according to claim 1, characterized in that: The wheel shaft is coaxially provided with a brake disc, and the rope pulley is provided with a trigger brake cam, which is rotatably matched with the rope pulley; A speed regulating member is provided between the throwing end of one centrifugal throwing block and the rope wheel, and the speed regulating member is used to adjust the speed limit of the speed limiter, and the throwing end of the other centrifugal throwing block is connected to the trigger brake cam; When the speed limiter is in an overspeed state, the ejection end of the centrifugal throw weight is linked to trigger the brake cam to rotate to fit the brake disc to achieve rope wheel braking.

5. The speed limiter according to claim 4, characterized in that: The trigger brake cam is an eccentric cam.

6. The speed limiter according to claim 4, characterized in that: A brake limiting protrusion is provided outside the trigger brake cam, which is used to limit the braking stroke after the trigger brake cam is in contact with the brake disc.

7. The speed limiter according to claim 4, characterized in that: A limit pin is provided outside the trigger brake cam, and correspondingly, the rope wheel is provided with a reset stroke limit column; When the speed limiter is in the reset state, the throwing end of the centrifugal throwing block is reset, and the brake cam is triggered to rotate in the opposite direction through the linkage arm until the limit pin contacts or has clearance fit with the reset stroke limit column.

8. The speed limiter according to claim 4, characterized in that: A sealing ring is arranged on the end surface of the brake disc.

9. The speed limiter according to any one of claims 1 to 8, characterized in that: A switch plate and a reverse switch plate are respectively arranged on the two centrifugal swing blocks, which are respectively used to trigger the speed limiter switch installed on the base frame.

10. The speed limiter according to claim 9, characterized in that: The switch plate and the reverse switch plate are symmetrically distributed on both sides of the brake disc, and the outer sides of the switch plate and the reverse switch plate have arc-shaped triggering surfaces; The inner sides of the switch plate and the reverse switch plate are provided with tracks extending along the circumferential direction of the wheel axle, and the tracks are inclined surfaces or arc surfaces; The base frame is provided with a manual trigger, and when the manual trigger is pressed down to contact the track, the manual trigger drives the centrifugal block to open, and triggers the brake cam to rotate to fit the brake disc through the linkage arm to achieve rope wheel braking; The manual trigger member includes a pressing pin shaft, a reset spring and a trigger pin. The reset spring is sleeved on the head of the pressing pin shaft and the boss of the base frame. The trigger pin is fixedly installed on the head of the pressing pin shaft and extends above the track so that the trigger pin contacts the track after the pressing pin shaft is pressed down.

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