CN212608882U

CN212608882U - Overspeed protection device for seat elevator

Info

Publication number: CN212608882U
Application number: CN202021530712.1U
Authority: CN
Inventors: 陈韵如
Original assignee: Omni M&e Technology Kunshan Co ltd
Current assignee: Omni M&e Technology Kunshan Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-02-26
Anticipated expiration: 2030-07-29

Abstract

The utility model discloses an overspeed protection device for seat elevator, include: the cam and the ratchet wheel are arranged in a staggered manner, and a convex part on the cam is arranged with a pawl on the ratchet wheel; the rocker arm assembly can be rotatably arranged on the cam, one end of the rocker arm assembly is provided with a roller which is contacted with the periphery of the cam, and the other end of the rocker arm assembly is provided with a rocker arm hook which is opposite to the periphery of the ratchet wheel; the spring is connected with the rocker arm hook and used for enabling the rotating speed of the rocker arm hook to be matched with the preset rotating speed of the output shaft when the rotating speed of the output shaft is in the preset rotating speed range, so that the rocker arm hook and the pawl are staggered; limit switch, limit switch and the relative setting of gyro wheel, limit switch are used for controlling the output shaft, and the rocking arm hook is detained mutually with the pawl when the output shaft surpasss and predetermines the rotational speed to make the rocking arm subassembly pass through limit switch and make the output shaft stop rotatory. By arranging the overspeed protection device on the output shaft, the output shaft is controlled to stop rotating when overspeed occurs, so that the life safety of a user is guaranteed.

Description

Overspeed protection device for seat elevator

Technical Field

The utility model relates to a seat elevator field especially relates to an overspeed protection device for seat elevator.

Background

The seat elevator is an elevator running on the side of the stairs, and mainly has the function of helping people who are inconvenient to move up and down the stairs. The driving structure of the existing seat elevator is shown in fig. 1, and comprises a band-type brake motor 1 and a speed reducer 2 connected with the band-type brake motor 1, wherein a gear 4 is arranged on an output shaft 3 of the speed reducer 2, and the gear 4 moves along a rack 5 matched with the gear 4 under the driving of the band-type brake motor 1, so that the seat elevator moves along the extending direction of the rack 5, and the purpose of transporting passengers is achieved. In the conventional driving structure, when a system failure occurs, the stairlift moves down abnormally and rapidly. Therefore, there is a great safety risk to the person riding on the seat elevator.

Disclosure of Invention

In order to overcome the defect among the prior art, the embodiment of the utility model provides an overspeed protection device for seat elevator through using the device, can in time control the output shaft stall rotation when the output shaft hypervelocity operates, guarantees the safety of taking personnel.

In order to achieve the above purpose, the utility model adopts the technical scheme that: an overspeed protection device for a stairlift, comprising:

the cam is fixedly connected with the output shaft and rotates along with the output shaft, and a plurality of convex parts are arranged on the periphery of the cam at equal intervals;

the ratchet wheel is fixed on the cam, a plurality of pawls are arranged on the periphery of the ratchet wheel at equal intervals, and the pawls and the protrusions are arranged in a staggered mode;

the rocker arm assembly can be rotatably arranged on the cam, one end of the rocker arm assembly is provided with a roller which is contacted with the periphery of the cam, and the other end of the rocker arm assembly is provided with a rocker arm hook which is opposite to the periphery of the ratchet wheel;

the spring is connected with the rocker hook and used for enabling the rotating speed of the rocker hook to be matched with the preset rotating speed of the output shaft when the rotating speed of the output shaft is in the preset rotating speed range, so that the rocker hook and the pawl are staggered;

the limit switch is opposite to the idler wheel and used for controlling the output shaft, and the rocker arm hook is buckled with the pawl when the output shaft exceeds the preset rotating speed, so that the rocker arm assembly stops rotating through the limit switch.

In the technical scheme, the rotating speed of the output shaft of the rocker arm hook is within a preset rotating speed range, and a reserved gap is reserved between the rocker arm hook and the pawl when the rocker arm hook is opposite to the pawl.

In the technical scheme, the reserved gap is 1mm-3 mm.

In the above technical scheme, the rocker arm assembly comprises a rotating shaft and a rocker arm, the rotating shaft is parallel to the output shaft, and the center of the rocker arm is fixed on the rotating shaft.

In the technical scheme, the rocker arm hook is a barb formed inwards at one end of the rocker arm, and the roller is arranged at the other end of the rocker arm through the roller seat.

In the above technical solution, the opening direction of the rocker arm hook and the rotation direction of the output shaft are arranged in opposite directions.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. the utility model discloses in set up cam, ratchet fixedly connected with cam on the output shaft and can set up the rocker arm assembly on the cam rotatably, through the cooperation of rocker arm assembly and cam, under the predetermined rotational speed, the rocker arm hook on the rocker arm assembly can be in the wrong with the pawl, make the output shaft can normally rotate; when exceeding and predetermineeing the rotational speed, the rocking arm hook is detained mutually with the pawl to make the rocking arm subassembly pass through limit switch and make the output shaft stop rotatory, protect the personnel's of taking safety.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a driving structure in the prior art;

FIG. 2 is a schematic view of the assembly of the driving structure and the protection device of the present invention;

FIG. 3 is a schematic view of a protective device of the present invention;

fig. 4 is a schematic view of the rotation state of the middle protection device of the present invention.

Reference numerals of the above figures: 1. a band-type brake motor; 2. a speed reducer; 3. an output shaft; 4. a gear; 5. a rack; 6. a cam; 7. a boss portion; 8. a ratchet wheel; 9. a pawl; 10. a roller; 11. a rocker arm hook; 12. a spring; 13. a limit switch; 14. reserving a gap; 15. a rotating shaft; 16. a rocker arm; 17. a roller seat; 18. a machine base.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The first embodiment is as follows: referring to fig. 2 to 4, an overspeed protection apparatus for a stairlift, comprising:

the cam 6 is fixedly connected with the output shaft 3 and rotates along with the output shaft 3, and a plurality of convex parts 7 are arranged on the periphery of the cam 6 at equal intervals;

a ratchet wheel 8 fixed on the cam 6, wherein a plurality of pawls 9 are arranged on the periphery of the ratchet wheel 8 at equal intervals, and the pawls 9 and the boss 7 are arranged in a staggered manner;

a rocker arm assembly rotatably disposed on the cam 6, one end of the rocker arm assembly being provided with a roller 10 contacting with the outer periphery of the cam 6, and the other end of the rocker arm assembly being provided with a rocker arm hook 11 opposing the outer periphery of the ratchet 8;

the spring 12 is connected with the rocker arm hook 11, and the spring 12 is used for matching the rotating speed of the rocker arm hook 11 with the preset rotating speed of the output shaft 3 when the rotating speed of the output shaft 3 is in a preset rotating speed range, so that the rocker arm hook 11 is staggered with the pawl 9;

the limit switch 13 is arranged opposite to the roller 10, the limit switch 13 is used for controlling the output shaft 3, and the rocker arm hook 11 is buckled with the pawl 9 when the output shaft 3 exceeds the preset rotating speed, so that the rocker arm assembly stops rotating the output shaft 3 through the limit switch 13.

By arranging the overspeed protection device on the output shaft 3, when the output shaft 3 rotates beyond the preset rotating speed, the overspeed protection device can control the output shaft 3 to stop rotating, so that the safety of passengers is protected.

According to the set factors such as the difference of preset rotating speed, the weight of the roller 10, the weight of the rocker arm assembly and the like, the springs 12 with different elastic forces are selected, so that the rotating speed of the rocker arm assembly is matched with the rotating speed of the output shaft 3.

Referring to fig. 2, the band-type brake motor 1 is fixed on a base 18, a speed reducer 2 is connected with the band-type brake motor 1, an output shaft 3 of the speed reducer 2 penetrates through the base 18, a gear 4 is arranged at one end of the output shaft 3, and the gear 4 rotates with the output shaft 3 under the driving of the band-type brake motor 1 to enable the gear 4 to move along a rack 5. The overspeed protection device is arranged on the side of the machine base 18 facing the gear wheel 4. The cam 6 is sleeved on the output shaft 3, the ratchet wheel 8 is sleeved on the output shaft 3, and the ratchet wheel 8 is fixedly connected with the cam 6. The ratchet wheel 8 can be fixedly arranged on one side of the cam 6 facing the base 18.

The limit switch 13 is connected with the band-type brake motor 1, and the rotation of the output shaft 3 is controlled by controlling the operation of the band-type brake motor 1.

In a preferred embodiment, the rocker arm assembly is disposed above the cam 6, as shown in fig. 2. The rocker arm assembly comprises a rotating shaft 15 and a rocker arm 16, and the rotating shaft 15 is fixedly arranged on the base 18. The rotating shaft 15 is arranged in parallel with the output shaft 3, and the center of the rocker arm 16 is fixed on the rotating shaft 15.

Referring to fig. 3, the rocker arm hook 11 is a barb formed inward at one end of the rocker arm 16, and the roller 10 is provided at the other end of the rocker arm 16 through a roller seat 17. Specifically, the roller seat 17 is disposed on a side of the rocker arm 16 facing away from the base 18.

As shown in fig. 3, the opening direction of the rocker arm hook 11 is set opposite to the rotation direction of the output shaft 3. For example, when the rotation direction of the output shaft 3 is clockwise rotation, the rocker arm hook 11 may be disposed on the left side of the rocker arm 16 with its opening facing to the right; when the rotation direction of the output shaft 3 is counterclockwise rotation, the rocker arm hook 11 may be disposed on the right side of the rocker arm 16 with its opening to the left. So that the rocker hook 11 can catch the pawl 9 when the output shaft 3 exceeds a predetermined rotational speed.

In a preferred embodiment, the rocker hook 11 is provided with a predetermined clearance 14 with the pawl 9 when the rotational speed of the output shaft 3 is within a predetermined rotational speed range and the rocker hook 11 is opposite to the pawl 9. The reserved gap 14 is 1mm-3 mm. Preferably, the allowance gap 14 may be set to 2 mm.

In a preferred embodiment, the cam 6 is square, and four corners of the square are connected by arcs to form four protrusions 7. The ratchet wheel 8 comprises a round wheel and four pawls 9 formed by outward protruding of the outer edge of the round wheel, and the included angle alpha between every two adjacent pawls 9 is 90 degrees. The included angle beta between the pawl 9 and the adjacent boss 7 is 45 degrees.

Referring to fig. 4, which is a schematic view of the rotational state of the overspeed protection apparatus, with reference to two positions a1 and a2, when the output shaft 3 rotates at a preset rotational speed, the rocker hook 11 always gets out of phase with the pawl 9.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. An overspeed protection device for a stairlift, comprising:

2. The overspeed protection device for stairlifts according to claim 1, characterized in that: the rotating speed of the output shaft of the rocker arm hook is within a preset rotating speed range, and a reserved gap is formed between the rocker arm hook and the pawl when the rocker arm hook is opposite to the pawl.

3. The overspeed protection device for stairlifts according to claim 2, characterized in that: the reserved gap is 1mm-3 mm.

4. The overspeed protection device for stairlifts according to claim 1, characterized in that: the rocker arm assembly comprises a rotating shaft and a rocker arm, the rotating shaft and the output shaft are arranged in parallel, and the center of the rocker arm is fixed on the rotating shaft.

5. The overspeed protection device for stairlifts according to claim 4, characterized in that: the rocker arm hook is a barb formed by one end of the rocker arm inwards, and the roller is arranged at the other end of the rocker arm through the roller seat.

6. The overspeed protection device for stairlifts according to claim 4, characterized in that: the opening direction of the rocker arm hook is opposite to the rotating direction of the output shaft.

7. The overspeed protection device for stairlifts according to claim 1, characterized in that: the cam is square, and four convex parts are formed at four corners of the cam through arc connection.

8. The overspeed protection device for stairlifts according to claim 7, characterized in that: the ratchet wheel comprises a round wheel and four pawls formed by outward protruding of the outer edge of the round wheel, and the included angle alpha between every two adjacent pawls is 90 degrees.

9. The overspeed protection device for stairlifts according to claim 8, characterized in that: the included angle beta between the pawl and the adjacent convex part is 45 degrees.