An overspeed protection device for a seat elevator

Abstract

The invention discloses an overspeed protection device for a seat elevator, comprising: a cam, a ratchet, a protrusion on the cam and a ratchet on the ratchet are staggered; a rocker assembly rotatably arranged on the cam, one end of the rocker assembly is provided with a roller in contact with the outer periphery of the cam, and the other end of the rocker assembly is provided with a rocker hook opposite to the outer periphery of the ratchet; a spring, the spring is connected to the rocker hook, and the spring is used to make the rotation speed of the rocker hook match the preset speed of the output shaft when the speed of the output shaft is within the preset speed range, so that the rocker hook and the ratchet are staggered; a limit switch, the limit switch is arranged opposite to the roller, the limit switch is used to control the output shaft, the rocker hook is locked with the ratchet when the output shaft exceeds the preset speed, so that the rocker assembly stops the output shaft from rotating through the limit switch. By arranging the overspeed protection device on the output shaft, the output shaft is controlled to stop rotating when it is overspeeding, thereby ensuring the life safety of users.

Description

Technical Field

[0001] The invention relates to the field of seat elevators, and in particular to an overspeed protection device for seat elevators. Background Art

[0002] A chair elevator is an elevator that runs on the side of the stairs. Its main function is to help people with limited mobility go up and down the stairs. Figure 1 As shown, it includes a brake motor 1, a reducer 2 connected to the brake motor 1, and a gear 4 is arranged on the output shaft 3 of the reducer 2. The gear 4 moves along the rack 5 matched therewith under the drive of the brake motor 1, so that the chair elevator moves along the extension direction of the rack 5 to achieve the purpose of transporting passengers. In the existing drive structure, when a system failure occurs, the chair elevator will move downward abnormally quickly. Therefore, there is a great safety hazard for people riding on the chair elevator. Summary of the invention

[0003] In order to overcome the defects in the prior art, an embodiment of the present invention provides an overspeed protection device for a seat elevator. By using the device, the output shaft can be promptly controlled to stop rotating when the output shaft is overspeeding, thereby ensuring the safety of passengers.

[0004] To achieve the above object, the technical solution adopted by the present invention is: an overspeed protection device for a seat elevator, comprising:

[0005] A cam fixedly connected to the output shaft and rotating with the output shaft, wherein a plurality of protrusions are arranged at equal intervals on the outer periphery of the cam;

[0006] A ratchet wheel fixed on the cam, a plurality of ratchet pawls are arranged at equal intervals on the outer circumference of the ratchet wheel, and the ratchet pawls are arranged staggered with the protrusions;

[0007] a rocker arm assembly rotatably arranged on the cam, wherein one end of the rocker arm assembly is provided with a roller in contact with the outer periphery of the cam, and the other end of the rocker arm assembly is provided with a rocker arm hook opposite to the outer periphery of the ratchet wheel;

[0008] a spring, the spring being connected to the rocker hook, the spring being used to make the rotation speed of the rocker hook match the preset speed of the output shaft when the speed of the output shaft is within a preset speed range, so as to stagger the rocker hook and the pawl;

[0009] A limit switch is arranged opposite to the roller, and the limit switch is used to control the output shaft. When the output shaft exceeds the preset rotation speed, the rocker arm hook is engaged with the pawl, so that the rocker arm assembly stops the output shaft from rotating through the limit switch.

[0010] In the above technical solution, when the rotation speed of the output shaft is within a preset rotation speed range and the rocker hook is opposite to the ratchet, a reserved gap is provided between the rocker hook and the ratchet.

[0011] In the above technical solution, the reserved gap is 1mm-3mm.

[0012] In the above technical solution, the rocker arm assembly includes a rotating shaft and a rocker arm. The rotating shaft is arranged parallel to the output shaft, and the center of the rocker arm is fixed on the rotating shaft.

[0013] In the above technical solution, the rocker arm hook is a barb formed inwardly at one end of the rocker arm, and the roller is arranged on the other end of the rocker arm through a roller seat.

[0014] In the above technical solution, the opening direction of the rocker hook is arranged opposite to the rotation direction of the output shaft.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] 1. In the present invention, a cam, a ratchet wheel fixedly connected to the cam, and a rocker arm assembly rotatably arranged on the cam are arranged on the output shaft. Through the cooperation between the rocker arm assembly and the cam, at a preset speed, the rocker arm hook on the rocker arm assembly can be staggered with the ratchet pawl, so that the output shaft can rotate normally; when the preset speed is exceeded, the rocker arm hook and the ratchet pawl are locked, so that the rocker arm assembly stops the rotation of the output shaft through the limit switch to protect the safety of the passengers.

[0017] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a driving structure in the background technology;

[0020] Figure 2 It is a schematic diagram of the assembly of the driving structure and the protection device in the present invention;

[0021] Figure 3 It is a schematic diagram of the protection device in the present invention;

[0022] Figure 4It is a schematic diagram of the rotation state of the protection device in the present invention.

[0023] The figure marks of the above drawings are: 1. brake motor; 2. reducer; 3. output shaft; 4. gear; 5. rack; 6. cam; 7. protrusion; 8. ratchet; 9. pawl; 10. roller; 11. rocker arm hook; 12. spring; 13. limit switch; 14. reserved gap; 15. rotating shaft; 16. rocker arm; 17. roller seat; 18. machine base. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0025] Example 1: See Figures 2 to 4 As shown, an overspeed protection device for a seat elevator comprises:

[0026] A cam 6 is fixedly connected to the output shaft 3 and rotates with the output shaft 3, and a plurality of protrusions 7 are arranged at equal intervals on the outer periphery of the cam 6;

[0027] A ratchet wheel 8 is fixed on the cam 6, and a plurality of ratchet pawls 9 are arranged at equal intervals on the outer circumference of the ratchet wheel 8, and the ratchet pawls 9 are arranged staggered with the protrusions 7;

[0028] A rocker arm assembly rotatably disposed on the cam 6, wherein one end of the rocker arm assembly is provided with a roller 10 in contact with the outer periphery of the cam 6, and the other end of the rocker arm assembly is provided with a rocker arm hook 11 opposite to the outer periphery of the ratchet 8;

[0029] A spring 12, wherein the spring 12 is connected to the rocker hook 11, and the spring 12 is used to make the rotation speed of the rocker hook 11 match the preset speed of the output shaft 3 when the speed of the output shaft 3 is within a preset speed range, so that the rocker hook 11 is staggered with the ratchet 9;

[0030] The limit switch 13 is arranged opposite to the roller 10, and the limit switch 13 is used to control the output shaft 3. When the output shaft 3 exceeds the preset speed, the rocker hook 11 is engaged with the pawl 9, so that the rocker assembly stops the output shaft 3 from rotating through the limit switch 13.

[0031] By arranging the overspeed protection device on the output shaft 3, when the output shaft 3 rotates beyond a preset speed, the overspeed protection device can control the output shaft 3 to stop rotating, thereby protecting the safety of passengers.

[0032] Depending on the different preset rotation speeds, the weight of the roller 10 , the weight of the rocker arm assembly and other factors, springs 12 with different elastic forces are selected to match the rotation speed of the rocker arm assembly with the rotation speed of the output shaft 3 .

[0033] See also Figure 2 As shown, the brake motor 1 is fixed on the base 18, and a reducer 2 is connected to the brake motor 1. The output shaft 3 of the reducer 2 passes through the base 18, and a gear 4 is provided at one end of the output shaft 3. The gear 4 rotates with the output shaft 3 when the brake motor 1 drives the output shaft 3 to rotate, so that the gear 4 can move along the rack 5. The overspeed protection device is arranged on the side of the base 18 facing the gear 4. The cam 6 is sleeved on the output shaft 3, and the ratchet 8 is sleeved on the output shaft 3, and the ratchet 8 is fixedly connected to the cam 6. The ratchet 8 can be fixedly arranged on the side of the cam 6 facing the base 18.

[0034] The limit switch 13 is connected to the brake motor 1 , and controls the rotation of the output shaft 3 by controlling the operation of the brake motor 1 .

[0035] In a preferred embodiment, the rocker arm assembly is arranged above the cam 6, see Figure 2 The rocker arm assembly includes a rotating shaft 15 and a rocker arm 16, wherein the rotating shaft 15 is fixedly disposed on the base 18. The rotating shaft 15 is disposed parallel to the output shaft 3, and the center of the rocker arm 16 is fixed on the rotating shaft 15.

[0036] See also Figure 3 As shown, the rocker hook 11 is a barb formed inwardly at one end of the rocker 16, and the roller 10 is arranged at the other end of the rocker 16 through a roller seat 17. Specifically, the roller seat 17 is arranged on the side of the rocker 16 facing away from the machine base 18.

[0037] See also Figure 3 As shown, the opening direction of the rocker hook 11 is arranged opposite to the rotation direction of the output shaft 3. For example, when the rotation direction of the output shaft 3 is clockwise, the rocker hook 11 can be arranged on the left side of the rocker arm 16, and its opening faces right; when the rotation direction of the output shaft 3 is counterclockwise, the rocker hook 11 can be arranged on the right side of the rocker arm 16, and its opening faces left. Thus, the rocker hook 11 can be locked with the ratchet 9 when the output shaft 3 exceeds the preset speed.

[0038] In a preferred embodiment, when the rotation speed of the output shaft 3 is within a preset rotation speed range and the rocker hook 11 is opposite to the ratchet 9, a reserved gap 14 is provided between the rocker hook 11 and the ratchet 9. The reserved gap 14 is 1 mm to 3 mm. Preferably, the reserved gap 14 can be set to 2 mm.

[0039] In a preferred embodiment, the cam 6 is square, and its four corners are connected by arcs to form four protrusions 7. The ratchet 8 includes a round wheel, and a pawl 9 formed by the outer edge of the round wheel protruding outward, and the pawl 9 includes four pawls, and the angle α between adjacent pawls 9 is 90°. The angle β between the pawl 9 and the adjacent protrusion 7 is 45°.

[0040] See also Figure 4 The figure is a schematic diagram of the rotation state of the overspeed protection device. Taking the positions A1 and A2 as references, when the output shaft 3 rotates at a preset speed, the rocker hook 11 is always staggered with the pawl 9.

[0041] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An overspeed protection device for a seat elevator, characterized in that: include: A cam fixedly connected to the output shaft and rotating with the output shaft, wherein a plurality of protrusions are arranged at equal intervals on the outer periphery of the cam; A ratchet wheel fixed on the cam, a plurality of ratchet pawls are arranged at equal intervals on the outer circumference of the ratchet wheel, and the ratchet pawls are arranged staggered with the protrusions; a rocker arm assembly rotatably arranged on the cam, wherein one end of the rocker arm assembly is provided with a roller in contact with the outer periphery of the cam, and the other end of the rocker arm assembly is provided with a rocker arm hook opposite to the outer periphery of the ratchet wheel; a spring, the spring being connected to the rocker hook, the spring being used to make the rotation speed of the rocker hook match the preset speed of the output shaft when the speed of the output shaft is within a preset speed range, so as to stagger the rocker hook and the pawl; A limit switch, the limit switch is arranged opposite to the roller, the limit switch is used to control the output shaft, the rocker arm hook is locked with the pawl when the output shaft exceeds the preset speed, so that the rocker arm assembly stops the output shaft from rotating through the limit switch; When the rotation speed of the output shaft is within a preset rotation speed range and the rocker hook is opposite to the ratchet, a reserved gap is provided between the rocker hook and the ratchet; the reserved gap is 1 mm-3 mm; The rocker arm assembly comprises a rotating shaft and a rocker arm, wherein the rotating shaft is arranged parallel to the output shaft, and the center of the rocker arm is fixed on the rotating shaft; the rocker arm hook is a barb formed inwardly at one end of the rocker arm, and the roller is arranged at the other end of the rocker arm through a roller seat; the opening direction of the rocker arm hook is arranged opposite to the rotation direction of the output shaft; The cam is square, and four corners thereof are connected by arcs to form four protrusions.

2. The overspeed protection device for a seat elevator according to claim 1, characterized in that: The ratchet wheel comprises a circular wheel and a pawl formed by protruding outward from the outer edge of the circular wheel. The pawl comprises four pawls, and the angle α between adjacent pawls is 90°.

3. The overspeed protection device for a seat elevator according to claim 2, characterized in that: The included angle β between the pawl and the adjacent protrusion is 45°.

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