Protection device for elevator descending overspeed

Abstract

The utility model provides a protection device for descending overspeed of an elevator, which relates to the technical field of elevators and comprises a shell, a groove matched with a guide rail of the elevator is arranged on the side wall of the shell, and a clamping component used for clamping the guide rail of the elevator is arranged in the shell; the side wall of the shell is provided with a speed measuring assembly used for detecting the speed of a lift car of an elevator. The speed measuring assembly comprises a bottom plate arranged on the side wall of the shell, a guide seat is arranged at the top of the bottom plate, a pair of rotating columns are symmetrically arranged in the guide seat, guide wheels are arranged on the side walls of the rotating columns, annular grooves are formed in the side walls of the guide wheels, and a reflective sticker is arranged at the end of one guide wheel. A speed measurement sensor is arranged at the position, corresponding to the reflective sticker, of the side wall of the guide base. The utility model has the advantages of reasonable structure, shortened braking response time and high safety.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to a protection device for an elevator descending overspeed. Background Art

[0002] An elevator is a permanent transport device that serves specific floors within a building. Its car runs on at least two rows of rigid tracks that are perpendicular to the horizontal plane or inclined at an angle of less than 15° to the vertical. During use, an elevator may exceed the speed limit due to a malfunction. In this case, a downward overspeed protection device is required to reduce the elevator's speed to ensure the safety of all passengers.

[0003] In the prior art, downward overspeed protection devices for elevators typically consist of a speed limiter and a safety clamp, or clamping assembly. Because the speed limiter is installed in the machine room or at the top of the hoistway, while the safety clamp is mounted on the car frame, there's a significant distance between the speed limiter and the safety clamp. This increases the signal transmission time between the two. Consequently, when the speed limiter detects an overspeed, it takes longer for the safety clamp to send an action signal to the safety clamp and control the elevator's braking system to respond, compromising safety. A downward overspeed protection device for elevators is needed to address this issue. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a protection device for elevator downward overspeed to solve the problems raised in the above background technology. The utility model has a reasonable structure, shortened response braking time and high safety.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: a protection device for elevator downhill overspeed, comprising:

[0006] A housing, wherein the side walls of the housing are provided with grooves matching the guide rails of the elevator, and a clamping assembly for clamping the guide rails of the elevator is provided inside the housing;

[0007] The side wall of the housing is provided with a speed measuring component for detecting the speed of the elevator car, and the speed measuring component is configured to send a signal to the clamping component when the speed exceeds a set value, so that the clamping component clamps the guide rail of the elevator;

[0008] The speed measuring assembly includes a bottom plate arranged on the side wall of the housing, a guide seat is arranged on the top of the bottom plate, a pair of rotating columns are symmetrically arranged inside the guide seat, the side walls of the pair of rotating columns are each provided with a guide wheel, the side walls of the pair of guide wheels are each provided with an annular groove, the end of one of the guide wheels is provided with a reflective sticker, a speed measuring sensor is provided at a position on the side wall of the guide seat corresponding to the reflective sticker, a through hole is provided on the top of the bottom plate, and a steel wire rope located inside the elevator shaft is provided inside the through hole;

[0009] Wherein, the speed sensor is electrically connected to the clamping assembly, and the steel wire rope is placed between a pair of annular grooves.

[0010] Furthermore, the clamping assembly includes a pair of clamping wedges symmetrically arranged on the lower side of the inner wall of the shell and placed on both sides of the groove, a pair of pressing wedges symmetrically arranged inside the shell and fitted with the pair of clamping wedges, the connection between the pressing wedges and the clamping wedges are provided with inclined surfaces inclined toward the inside of the shell, a guide plate is provided between the tops of the pair of pressing wedges, a clamping electric push rod connected to the guide plate is provided on the top of the shell, a fixing plate fitted with the tops of the clamping wedges is provided on the inner wall of the shell, and through grooves are provided on the guide plate and the fixing plate at positions corresponding to the grooves.

[0011] Furthermore, the inner wall of the shell is symmetrically provided with limiting grooves, and the side walls of the guide plate are symmetrically provided with limiting blocks matching the limiting grooves.

[0012] Furthermore, a PLC controller is provided on the shell, an A / D converter is provided at the input end of the PLC controller, a D / A converter is provided at the output end of the PLC controller, the speed sensor is electrically connected to the A / D converter, and the clamping electric push rod is electrically connected to the D / A converter.

[0013] Furthermore, guide grooves are symmetrically provided on the lower side of the inner wall of the shell and are placed on both sides of the groove. A pair of the clamping wedges are provided with guide blocks placed inside the guide grooves at the bottom. A guide column passing through the guide block is provided inside the guide groove, and a return spring is provided on the side wall of the guide column and is placed inside the guide groove.

[0014] Furthermore, a bearing is provided at the connection between the rotating column and the guide seat.

[0015] Furthermore, a connecting block is provided on the bottom plate, and bolts are provided at the connection between the connecting block and the shell.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows:

[0017] The utility model measures the speed of the elevator car through a speed measuring component. When it is detected that the speed exceeds a set value, a signal is sent to a clamping component to clamp the guide rails on the elevator and brake the elevator car. Since the distance between the speed sensor and the clamping component is relatively close, the response braking time is shortened and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 This is a perspective view of an elevator downward overspeed protection device according to one embodiment of the present utility model;

[0020] Figure 2 This is a sectional perspective view of a downward overspeed protection device for an elevator according to one embodiment of the present invention;

[0021] Figure 3 This is a perspective view of a speed measuring component in a downward overspeed protection device for an elevator according to an embodiment of the present invention;

[0022] Figure 4 This is a right side view of a speed measuring assembly in an elevator downward overspeed protection device according to one embodiment of the present utility model;

[0023] Figure 5 This is a perspective view of a clamping assembly in an elevator downward overspeed protection device according to one embodiment of the present utility model;

[0024] In the figure: 1. Shell; 101. Groove; 2. Clamping assembly; 21. Clamping electric push rod; 22. Guide plate; 23. Fixed plate; 24. Limiting groove; 25. Limiting block; 26. Clamping wedge; 27. Pressing wedge; 28. Inclined surface; 29. ​​Through groove; 3. Speed ​​measuring assembly; 31. Bottom plate; 311. Connecting block; 312. Bolt; 32. Guide wheel; 321. Annular groove; 33. Guide seat; 34. Speed ​​sensor; 35. Rotating column; 351. Bearing; 36. Reflective tape; 37. Through hole; 38. Wire rope; 4. Guide column; 5. Guide block; 6. Guide groove; 7. Return spring. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] like Figure 1 As shown, the utility model provides a technical solution: a protection device for elevator downward overspeed, comprising:

[0027] The housing 1 has a side wall provided with a groove 101 matching the guide rail of the elevator, and a clamping assembly 2 for clamping the guide rail of the elevator is provided inside the housing 1;

[0028] The side wall of the housing 1 is provided with a speed measuring component 3 for detecting the speed of the elevator car. The speed measuring component 3 is configured to send a signal when the speed exceeds a set value to the clamping component 2, and cause the clamping component 2 to clamp the guide rail of the elevator.

[0029] The speed measuring assembly 3 includes a base plate 31 provided on the side wall of the housing 1. A guide seat 33 is provided on the top of the base plate 31. A pair of rotating columns 35 are symmetrically provided inside the guide seat 33. The side walls of the pair of rotating columns 35 are each provided with a guide wheel 32. The side walls of the pair of guide wheels 32 are each provided with an annular groove 321. A reflective sticker 36 is provided on the end of one of the guide wheels 32. A speed measuring sensor 34 is provided at a position on the side wall of the guide seat 33 corresponding to the reflective sticker 36. A through hole 37 is provided on the top of the base plate 31. A steel wire rope 38 located inside the elevator shaft is provided inside the through hole 37.

[0030] The speed sensor 34 is electrically connected to the clamping assembly 2, and a wire rope 38 is placed between a pair of annular grooves 321. This design allows the wire rope 38 to pass through a through hole 37 and be placed between a pair of guide wheels 32. When the elevator car moves, the annular grooves 321 on the guide wheels 32 guide the wire rope 38, driving the guide wheels 32 to rotate simultaneously. The speed sensor 34 emits a laser beam that reflects off the reflective tape 36, which then rotates. The number of reflected beams received by the speed sensor 34 per unit time is measured, thereby measuring the speed of the guide wheels 32 and, in turn, the speed of the elevator car. When the speed sensor 34 detects that the speed exceeds a set value, it sends a signal to the clamping assembly 2 to clamp the elevator guide rails and brake the elevator car. Since the speed sensor 34 is relatively close to the clamping assembly 2, the braking response time is shortened, improving safety. The housing 1 is mounted on the elevator car, and the speed sensor assembly 3 is mounted on the housing 1.

[0031] Reference Figure 2 and Figure 5The clamping assembly 2 includes a pair of clamping wedges 26 symmetrically arranged on the lower side of the inner wall of the shell 1 and placed on both sides of the groove 101. A pair of pressing wedges 27 that fit with the pair of clamping wedges 26 are symmetrically arranged inside the shell 1. The connection between the pressing wedges 27 and the clamping wedges 26 is provided with an inclined surface 28 inclined toward the inside of the shell 1. A guide plate 22 is provided between the tops of the pair of pressing wedges 27. A clamping electric push rod 21 connected to the guide plate 22 is provided on the top of the shell 1. A fixing plate 23 that fits with the top of the clamping wedge 26 is provided on the inner wall of the shell 1. Through grooves 29 are opened at positions corresponding to the grooves 101 on the guide plate 22 and the fixing plate 23. This design enables the clamping electric push rod 21 in the clamping assembly 2 to work and drive the guide plate 22 to move upward. The upward movement of the guide plate 22 drives the pair of pressing wedges 27 to move upward. The pair of pressing wedges 27 move upward and, under the guidance of the inclined surface 28, push the pair of clamping wedges 26 to move toward each other along the bottom of the fixed plate 23 and the lower side of the inner wall of the shell 1, thereby clamping the guide rail on the elevator, thereby achieving braking of the elevator car, shortening the response braking time, and improving safety.

[0032] Reference Figure 2 The inner wall of the housing 1 is symmetrically provided with limit slots 24, and the side walls of the guide plate 22 are symmetrically provided with limit blocks 25 that match the limit slots 24. This design uses the limit blocks 25 to move within the limit slots 24 to achieve limit guidance for the guide plate 22, thereby improving the stability of the guide plate 22 in the vertical direction along the inner wall of the housing 1.

[0033] Reference Figure 1 and Figure 3, a PLC controller is provided on the housing 1, an A / D converter is provided at the input end of the PLC controller, a D / A converter is provided at the output end of the PLC controller, a speed sensor 34 is electrically connected to the A / D converter, and the clamping electric push rod 21 is electrically connected to the D / A converter. In this design, when the speed sensor 34 emits a laser beam to reflect the reflective sticker 36 and recovers a reflected light, the guide wheel 32 rotates to drive the reflective sticker 36 to rotate, and the number of reflected lights received by the speed sensor 34 per unit time can be measured, thereby measuring the speed of the guide wheel 32, and then measuring the moving speed of the elevator car; when the speed sensor 34 detects that the speed exceeds the set value, the signal The signal is sent to the PLC controller to control the clamping electric push rod 21 in the clamping assembly 2 to drive a pair of clamping wedges 26 to move toward each other between the bottom of the fixed plate 23 and the lower side of the inner wall of the shell 1, so as to clamp the guide rail on the elevator and brake the elevator car; when the speed sensor 34 detects that the speed is less than or equal to the set value, the signal is sent to the PLC controller to control the clamping electric push rod 21 in the clamping assembly 2 to work and drive the pair of clamping wedges 26 to lose the clamping of the elevator guide rail; since the distance between the speed sensor 34 and the clamping electric push rod 21 in the clamping assembly 2 is relatively close, the response braking time is shortened and the safety is high.

[0034] Reference Figure 2 The lower side of the inner wall of the housing 1 is symmetrically formed with guide grooves 6 on either side of the groove 101. A pair of clamping wedges 26 are each provided with a guide block 5 positioned within the guide grooves 6. A guide post 4 extends through the guide block 5 within the guide grooves 6. A return spring 7 is sleeved on the sidewall of the guide post 4 and positioned within the guide grooves 6. This design allows the guide blocks 5 to slide within the guide grooves 6 along the sidewall of the guide post 4, thereby improving the stability of the pair of clamping wedges 26 in lateral movement. Under the action of the return spring 7, when the wedges 27 are pressed back to their initial positions, the return spring 7 rebounds and pushes the guide blocks 5 laterally, causing the clamping wedges 26 to return to their initial positions and lose their grip on the elevator guide rails.

[0035] Reference Figure 3 A bearing 351 is provided at the connection between the rotating column 35 and the guide seat 33. This design improves the rotation stability of the rotating column 35 through the bearing 351.

[0036] Reference Figure 3 and Figure 4 A connecting block 311 is provided on the bottom plate 31, and a bolt 312 is provided at the connection between the connecting block 311 and the shell 1. This design facilitates the connection and fixation between the bottom plate 31 and the shell 1 through the bolt 312 and the connecting block 311.

[0037] Reference Figure 1-Figure 5As an embodiment of the present invention: when the elevator is overspeeding, the elevator car moves, and the annular groove 321 on the pair of guide wheels 32 guides the wire rope 38, driving the pair of guide wheels 32 to rotate simultaneously. The rotation of the guide wheels 32 drives the reflective sticker 36 to rotate, and the speed sensor 34 emits a laser beam to the reflective sticker 36 and reflects it back to a reflected light. The speed sensor 34 can measure the number of reflected lights received by the speed sensor 34 per unit time, thereby measuring the speed of the guide wheels 32, and then measuring the moving speed of the elevator car, thereby detecting the speed of the elevator.

[0038] When the speed sensor 34 detects that the speed exceeds the set value, it sends a signal to the PLC controller to control the clamping electric push rod 21 in the clamping assembly 2 to work, which can drive a pair of clamping wedges 26 to move toward each other, thereby clamping the guide rails on the elevator and braking the elevator car.

[0039] When the speed sensor 34 detects that the speed is less than or equal to the set value, it sends a signal to the PLC controller to control the clamping electric push rod 21 in the clamping assembly 2 to drive a pair of clamping wedges 26 to lose their clamping on the elevator guide rail; since the distance between the speed sensor 34 and the clamping electric push rod 21 is relatively close, the response braking time is shortened, the safety is high, and the practicality of the utility model is improved.

[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0041] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A protection device for an elevator descending overspeed, comprising: A housing (1), wherein a side wall of the housing (1) is provided with a groove (101) matching the guide rail of the elevator, and a clamping assembly (2) for clamping the guide rail of the elevator is provided inside the housing (1); Its characteristics are: The side wall of the housing (1) is provided with a speed measuring component (3) for detecting the speed of the elevator car, and the speed measuring component (3) is configured to send a signal when a speed exceeding a set value is detected to the clamping component (2), so that the clamping component (2) clamps the guide rail of the elevator; The speed measuring assembly (3) includes a bottom plate (31) arranged on the side wall of the housing (1), a guide seat (33) is arranged on the top of the bottom plate (31), a pair of rotating columns (35) are symmetrically arranged inside the guide seat (33), the side walls of the pair of rotating columns (35) are both provided with guide wheels (32), the side walls of the pair of guide wheels (32) are both provided with an annular groove (321), the end of one of the guide wheels (32) is provided with a reflective sticker (36), a speed measuring sensor (34) is provided at a position on the side wall of the guide seat (33) corresponding to the reflective sticker (36), a through hole (37) is provided on the top of the bottom plate (31), and a steel wire rope (38) located inside the elevator shaft is provided inside the through hole (37); The speed sensor (34) is electrically connected to the clamping assembly (2), and the steel wire rope (38) is placed between a pair of annular grooves (321).

2. The elevator downward overspeed protection device according to claim 1, characterized in that: The clamping assembly (2) includes a pair of clamping wedges (26) symmetrically arranged on the lower side of the inner wall of the shell (1) and placed on both sides of the groove (101), a pair of pressing wedges (27) symmetrically arranged inside the shell (1) and fitted with the pair of clamping wedges (26), and the connection between the pressing wedges (27) and the clamping wedges (26) is provided with an inclined surface (28) inclined toward the inside of the shell (1), a guide plate (22) is provided between the tops of the pair of pressing wedges (27), a clamping electric push rod (21) connected to the guide plate (22) is provided on the top of the shell (1), a fixing plate (23) fitted with the top of the clamping wedge (26) is provided on the inner wall of the shell (1), and through grooves (29) are provided at positions corresponding to the groove (101) on the guide plate (22) and the fixing plate (23).

3. The elevator downward overspeed protection device according to claim 2, characterized in that: The inner wall of the housing (1) is symmetrically provided with a limiting groove (24), and the side wall of the guide plate (22) is symmetrically provided with a limiting block (25) that matches the limiting groove (24).

4. The elevator downward overspeed protection device according to claim 2, characterized in that: The housing (1) is provided with a PLC controller, an A / D converter is provided at the input end of the PLC controller, a D / A converter is provided at the output end of the PLC controller, the speed sensor (34) is electrically connected to the A / D converter, and the clamping electric push rod (21) is electrically connected to the D / A converter.

5. The elevator downward overspeed protection device according to claim 2, characterized in that: The lower side of the inner wall of the housing (1) is symmetrically provided with guide grooves (6) disposed on both sides of the groove (101); the bottom of a pair of the clamping wedges (26) is provided with guide blocks (5) disposed inside the guide grooves (6); the guide grooves (6) are provided with guide columns (4) penetrating the guide blocks (5); and the side walls of the guide columns (4) are provided with return springs (7) disposed inside the guide grooves (6).

6. The elevator downward overspeed protection device according to claim 1, characterized in that: A bearing (351) is provided at the connection between the rotating column (35) and the guide seat (33).

7. The elevator downward overspeed protection device according to claim 1, characterized in that: A connecting block (311) is provided on the bottom plate (31), and a bolt (312) is provided at the connection between the connecting block (311) and the housing (1).

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