Compact tensioning device for elevator

Abstract

The utility model discloses a compact tensioning device for an elevator, which comprises a tensioning wheel bracket and is characterized in that one end of the tensioning wheel bracket is connected with a balancing weight, and the other end of the tensioning wheel bracket is connected with a tensioning wheel through a tensioning wheel shaft and is provided with a fixed bracket; the fixing support is connected with the tensioning wheel support through a rotating shaft, a safety switch is arranged at the connecting position or the connecting proximity position of the fixing support and the tensioning wheel support, and a switch beating plate matched with the safety switch is connected to the rotating shaft in a sleeved mode. And the rotating shaft is arranged in the outer edge of the tensioning wheel. The whole device is small in occupied space, the weight of the balancing weight can be reduced without increasing the weight of the device, the application of equivalent balance weight can be met by predetermining the position of the rotating shaft, the safety switch and the switch striking plate can act in a matched mode, and high reliability and stability are achieved.

Description

Technical Field

[0001] The utility model relates to elevator manufacturing technology, in particular to a compact tensioning device for elevators. Background Art

[0002] When an elevator is running, in order to enable the speed limiter to work properly and prevent the safety gear from malfunctioning, the speed limiter wire rope needs to have a certain pre-tensioning force. And the pre-tensioning force is achieved through a tensioning device. The tensioning device mainly provides the tensioning force through a counterweight. To keep the speed limiter wire rope always under sufficient tension, when the lifting height is different, the weight of the counterweight of the tensioning device will also be different. There are mainly two existing structures of tensioning devices. One is the suspended tensioning device as shown in the attached Figure 4 description. For this kind of device: when the lifting height is different, in order to keep the speed limiter wire rope always under sufficient tension and require an increase in the weight of the counterweight, since the counterweight of the suspended tensioning device is below the tensioning wheel, the tensioning device needs a larger installation space to complete. For some environments with limited hoistway space, it is very easy to interfere with other elevator components, and the cost is relatively high. The other is the cantilever tensioning device as shown in the attached Figure 5 description. When the lifting height is different, in order to keep the speed limiter wire rope always under sufficient tension, it also requires an increase in the weight of the counterweight. Due to the limitation of the structural arrangement of the tensioning device, a larger and heavier tensioning block needs to be configured, occupying more space in the hoistway pit, and it is also very easy to interfere with other elevator components, and the cost is relatively high. Summary of the Invention

[0003] The purpose of the utility model is to solve the above problems and provide a compact tensioning device for elevators, which has the characteristics of small occupied space, can reduce the weight of the counterweight without increasing its own weight, and high reliability and stability.

[0004] The above technical problems of the utility model are mainly solved by the following technical solution: A compact tensioning device for elevators, including a tensioning wheel bracket. The feature is that one end of the tensioning wheel bracket is connected with a counterweight, and the other end is connected with a tensioning wheel through a tensioning wheel shaft and is equipped with a fixed bracket; the fixed bracket is connected with the tensioning wheel bracket through a rotating shaft, and a safety switch is arranged at the connection part or near the connection point between the fixed bracket and the tensioning wheel bracket. A switch striker cooperating with the safety switch is sleeved on the rotating shaft; the rotating shaft is arranged inside the outer edge of the tensioning wheel.

[0005] In the aforementioned compact tensioning device for elevators, preferably, one end of the fixed bracket where the rotating shaft is provided cooperates with the tensioning wheel shaft to limit the rotation angle of the tensioning wheel bracket and prevent the switch from being damaged.

[0006] In the aforementioned compact tensioning device for an elevator, preferably, the distance between the center of the rotating shaft and the center of the tensioning wheel shaft is minimized.

[0007] In the aforementioned compact tensioning device for an elevator, preferably, bolt mounting slotted holes are provided on the fixed bracket.

[0008] In the aforementioned compact tensioning device for an elevator, preferably, the fixed bracket is of sheet metal structure, and the fixed bracket is connected to the guide rail through a pressure guide plate and bolt mounting slotted holes.

[0009] In the aforementioned compact tensioning device for an elevator, preferably, multiple bolt mounting slotted holes on the sheet metal structure fixed bracket are arranged in a staggered manner.

[0010] In the aforementioned compact tensioning device for an elevator, preferably, the fixed bracket is an L-shaped sheet metal structure, the bolt mounting slotted holes are arranged on one side of the L-shaped sheet metal structure, and the fixed bracket is fixed to the elevator pit floor through an anchor rod and bolt mounting slotted holes.

[0011] In the aforementioned compact tensioning device for an elevator, preferably, the bolt mounting slotted holes on the L-shaped steel bar fixed to the elevator pit floor are horizontal or / and vertical slotted holes.

[0012] In the aforementioned compact tensioning device for an elevator, preferably, a protective cover is provided outside the tensioning wheel, and the protective cover is integrally connected to the tensioning wheel bracket.

[0013] In the aforementioned compact tensioning device for an elevator, preferably, a rope blocking bolt is provided on the tensioning wheel bracket.

[0014] In this technical solution, through the tensioning wheel bracket, the counterweight block, the tensioning wheel and the fixed bracket are integrated into one body to form a tension force distribution system, so that the tension force is proportional to the sum of the weight of the tensioning wheel bracket and the distance from the tensioning wheel bracket to the center of the rotating shaft, and the weight of the counterweight block and the distance from the counterweight block to the center of the rotating shaft, and is inversely proportional to the distance from the center of the rotating shaft to the center of the tensioning wheel shaft and its gravity (the weight of the tensioning wheel). Therefore, according to this relationship, the required counterweight requirement can be achieved by reducing the weight of the counterweight block, and of course, there is no need to increase its own weight.

[0015] In this device, the fixed bracket is connected to the tensioning wheel bracket through a rotating shaft, and the rotating shaft becomes the moment fulcrum. Thus, within the allowable range of each component entity, the distance between the center of the rotating shaft and the center of the tensioning wheel shaft can be infinitely reduced to correspondingly reduce the weight of the counterweight block to achieve the same tension force.

[0016] Therefore, the positional relationship between the safety switch provided at the connection part or near the connection point of the fixed bracket and the tensioning wheel bracket, and the switch striker sleeved on the rotating shaft and cooperating with the safety switch will directly affect the distribution of the tensioning force. In this solution, the rotating shaft is arranged inside the outer edge of the tensioning wheel, and the matching part of the fixed bracket and the tensioning wheel shaft at one end of the rotating shaft is designed to be in a relationship of mutual limitation and mutual restriction, which not only meets the requirement of reducing the numerical value of the inverse relationship of the tensioning force, but also protects the safety switch and avoids damage.

[0017] The structure of this device is delicate. As long as the fixed bracket is slightly changed, it can meet the requirements of guide rail installation and installation on the bottom pit floor of the hoistway. And by arranging multiple bolt installation waist holes with staggered positions and opening horizontal and / or vertical waist holes, the purposes of longitudinal and transverse position adjustment, increasing the adjustment margin and reducing the installation difficulty are achieved.

[0018] Therefore, compared with the prior art, the beneficial effects of the present utility model are as follows: the whole device occupies a small space, and without increasing its own weight, it can reduce the weight of the counterweight block. It can also meet the application of equal weight by pre-determining the position of the rotating shaft, and can make the safety switch and the switch striker cooperate to act, with high reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the tensioning force relationship of the present utility model.

[0020] Figure 2 is a schematic structural diagram of Embodiment 1 of the present utility model.

[0021] Figure 3 is a schematic structural diagram of Embodiment 2 of the present utility model.

[0022] Figure 4 is a schematic structural diagram of a suspension type tensioning device in the prior art.

[0023] Figure 5 is a schematic structural diagram of a cantilever type tensioning device in the prior art.

[0024] In the figure: 1 - counterweight block, 2 - tensioning wheel bracket, 201 - rope retaining bolt, 3 - tensioning wheel shaft, 4 - rotating shaft, 5 - protective cover, 6 - tensioning wheel, 7 - fixed bracket, 701 - bolt installation waist hole, 8 - safety switch, 9 - switch striker.

[0025] F - tensioning force, g1 - weight of the tensioning wheel, g2 - weight of the tensioning wheel bracket, g3 - weight of the counterweight block, a - distance from the center of the rotating shaft to the center of the tensioning wheel shaft, b - distance from the tensioning wheel bracket to the center of the rotating shaft, c - distance from the counterweight block to the center of the rotating shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solution of the present utility model will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0027] In this embodiment, a compact tensioning device for an elevator is provided. Referring to Figures 1 to 3 , a horizontally arranged tensioning wheel bracket 2 is provided. One end of the tensioning wheel bracket 2 is connected to a counterweight 1, and the other end is connected to a tensioning wheel 6 through a tensioning wheel shaft 3 and is provided with a fixed bracket 7. The fixed bracket 7 is connected to the tensioning wheel bracket 2 through a rotating shaft 4. The rotating shaft 4 is arranged inside the outer edge of the tensioning wheel 6. The body of the tensioning wheel 6 can be a cast iron, a non-metallic material, or a sheet metal spinning wheel. A protective cover 5 is provided outside the tensioning wheel 6. Wire rope passing grooves are provided both above and below the protective cover 5. One end of the tensioning wheel bracket 2 connected to the tensioning wheel shaft 3 extends to be flush with the edge of the protective cover 5, and the entire protective cover 5 is integrally connected to the tensioning wheel bracket 2. A rope blocking bolt 201 is provided on the tensioning wheel bracket 2, and the lower part of the protective cover 5 also functions as a rope blocker.

[0028] A safety switch 8 is provided at the connection part or near the connection point between the fixed bracket 7 and the tensioning wheel bracket 2. A switch hitting plate 9 that cooperates with the safety switch is sleeved on the rotating shaft 4, aiming to make the distance between the center of the rotating shaft 4 and the center of the tensioning wheel shaft 3 reach the minimum value.

[0029] One end of the fixed bracket 7 where the rotating shaft 4 is provided cooperates with the tensioning wheel shaft 3 to limit the rotation angle of the tensioning wheel bracket 2 and prevent the switch from being damaged. Specifically, the fixed bracket 7 adopts a sheet metal structure. The end edge of the flat steel of the fixed bracket 7 can be close to the part of the tensioning wheel shaft 3 that extends outside the tensioning wheel bracket 2, and then the rotating shaft 4 is installed at an appropriate position on the flat steel while ensuring strength.

[0030] Embodiment 1: The fixed bracket 7 is of a sheet metal structure, and bolt installation waist holes 701 are provided on the fixed bracket 7. Referring to Figure 2 , a plurality of bolt installation waist holes 701 on the sheet metal structure fixed bracket 7 are arranged in a staggered manner. As shown in the figure, they are opened in two rows, upper and lower. The upper and lower rows are staggered and have an intersection area. The fixed bracket 7 with this structure can be connected to the guide rail in the elevator shaft through a pressing guide plate, bolts, and bolt installation waist holes 701.

[0031] Embodiment 2: The fixed bracket 7 is folded into an L-shaped structure by sheet metal processing. Referring to Figure 3 , a reinforcing rib plate can be welded at the bending inner angle. The bolt installation waist holes 701 are arranged on one side of the L-shaped structure. The bolt installation waist holes 701 are waist holes opened horizontally + longitudinally, that is, cross holes. The fixed bracket 7 with this structure can be fixed to the elevator pit floor through anchor bolts and bolt installation waist holes 701.

[0032] Working principle: Referring to Figure 1, whether it is Embodiment 1 or Embodiment 2, with the rotation axis 4 as the hinge point, the tension force F obtained by the tensioning device is proportional to the sum of the weight g2 of the tensioning wheel bracket, the distance b from the tensioning wheel bracket to the center of the rotation axis, the weight g3 of the counterweight, the distance c from the counterweight to the center of the rotation axis, and the weight g1 of the tensioning wheel, and inversely proportional to the distance a from the center of the rotation axis to the center of the tensioning wheel axis. As long as the distance a from the center of the rotation axis to the center of the tensioning wheel axis is minimized, a larger tension force F can be obtained.

[0033] That is: Tension force F = [(g2 * b + g3 * c) / a + g1] * 10

[0034] The above embodiments are illustrative of the present invention and not restrictive thereof. Without departing from the principle of the technical solution of the present invention, any equivalent changes or equivalent modifications made according to the technical idea proposed by the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A compact tensioning device for an elevator, comprising a tensioning wheel bracket (2), characterized in that: One end of the tension wheel bracket is connected to a counterweight (1), and the other end is connected to the tension wheel (6) through the tension wheel shaft (3) and is provided with a fixed bracket (7); the fixed bracket is connected to the tension wheel bracket (2) through a rotating shaft (4), a safety switch (8) is provided at the connection position or the connection point between the fixed bracket and the tension wheel bracket, and a switch plate (9) cooperating with the safety switch is sleeved on the rotating shaft; the rotating shaft is arranged inside the outer edge of the tension wheel.

2. A compact tensioning device for an elevator according to claim 1, characterized in that: The fixed bracket (7) cooperates with the tension wheel shaft (3) at one end provided with the rotating shaft (4) to limit the rotation angle of the tension wheel bracket (2).

3. A compact tensioning device for an elevator according to claim 1 or 2, characterized in that: The distance between the center of the rotating shaft (4) and the center of the tensioning wheel shaft (3) takes a minimum value.

4. A compact tensioning device for an elevator according to claim 1, characterized in that: The fixing bracket (7) is provided with a bolt mounting waist hole (701).

5. A compact tensioning device for an elevator according to claim 4, characterized in that: The fixing bracket (7) is a sheet metal structure, and is connected to the guide rail via a pressure guide plate and a bolt mounting waist hole (701).

6. A compact tensioning device for an elevator according to claim 4 or 5, characterized in that: A plurality of bolt mounting waist holes (701) on the fixing bracket (7) are arranged in staggered positions.

7. A compact tensioning device for an elevator according to claim 4, characterized in that: The fixing bracket (7) is an L-shaped sheet metal structure, and the bolt mounting waist hole (701) is arranged on one side of the L-shaped sheet metal structure. The fixing bracket is fixed to the elevator pit floor through anchor rods and the bolt mounting waist hole.

8. A compact tensioning device for an elevator according to claim 4 or 6, characterized in that: The bolt mounting waist holes (701) on the L-shaped sheet metal structure fixed to the elevator pit floor are transverse and / or longitudinal waist holes.

9. A compact tensioning device for an elevator according to claim 1, characterized in that: A protective cover (5) is provided outside the tension wheel (6), and the protective cover is connected to the tension wheel bracket (2) as a whole.

10. A compact tensioning device for an elevator according to claim 1 or 9, characterized in that: The tension wheel bracket (2) is provided with a rope blocking bolt (201).

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