Elevator car position detection device

Abstract

The utility model belongs to the technical field of elevator car position detection, and particularly discloses an elevator car position detection device which comprises an upper shading mechanism, a lower shading mechanism, a photoelectric switch and a control cabinet, wherein the upper shading mechanism and the lower shading mechanism are installed on a guide rail in a shaft, the photoelectric switch is installed above an elevator car, and the control cabinet is installed in an elevator machine room. The upper shading mechanism and the lower shading mechanism are located at the upper end and the lower end of a shaft respectively, and the photoelectric switch is connected with the control cabinet through a lift car traveling cable. The signal of the photoelectric switch is transmitted to the control cabinet of the machine room through the lift car traveling cable, cables do not need to be arranged independently, only one photoelectric switch is needed, and the detection cost of the lift car limit position of the lift is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator car position detection, and particularly relates to an elevator car position detection device. Background Art

[0002] In modern buildings, elevators have become indispensable vertical transportation equipment, and their safety, reliability, and efficiency have extremely important impacts on people's production and life. The elevator car position detection technology not only relates to the elevator operation efficiency but also is directly related to the safety of passengers.

[0003] At present, the position detection method of the elevator car 1 often adopts the form of a mechanical contact switch. For example, Figures 5-6 As shown, the limit switch 15 is installed on the guide rail 6 in the hoistway 7 through the bracket 41. The limit switch 15 is relatively stationary with respect to the position of the guide rail 6. There is a striker 14 for triggering the switch on the car frame 8. When the elevator car 1 approaches the upper limit or lower limit position of the hoistway 7, the striker 14 on the frame will compress the roller at the head of the switch to trigger the limit switch 15. After the limit switch 15 is triggered, the safety circuit of the elevator will be disconnected, causing the traction machine brake to stop the traction machine, so that the elevator car 1 stops, restricting the further upward or downward movement of the elevator car 1 to avoid the occurrence of elevator accidents.

[0004] However, at present, in order to achieve the above functions, two sets of limit switches 15 need to be installed in both the upper and lower parts of the hoistway 7 to determine the position of the car. The limit switch 15 transmits the signal to the control cabinet 10 in the machine room 11 at the upper part of the hoistway 7 through the switch cable 13, so as to ensure the safe operation of the elevator.

[0005] However, the device for triggering the mechanical switch is fixed on the car frame, and the triggering device is in the form of a striker. In order to ensure that the car triggers the mechanical switch and the limit switch is always in the triggered state before the car completely compresses the buffer on the car side or the counterweight completely compresses the buffer on the counterweight side, the striker needs to be set with a sufficient length.

[0006] In addition, the cable connecting the switch at the lower part of the hoistway and the machine room control cabinet needs to run through the entire hoistway. When the hoistway height is large, the cable cost also increases accordingly.

[0007] In summary, the above factors increase the current cost of elevator car position detection and make it difficult to install and maintain the detection equipment. Therefore, we need to propose an elevator car position detection device to solve the above existing problems, which can effectively reduce the cost of elevator car position detection and at the same time increase the accuracy of elevator car position detection. Content of the Utility Model

[0008] The purpose of the present utility model is to provide an elevator car position detection device, which can effectively reduce the cost of elevator car position detection and at the same time increase the accuracy of elevator car position detection, so as to solve the problems raised in the background technology.

[0009] To achieve the above object, the present utility model provides the following technical solution: An elevator car position detection device includes an upper light-shielding mechanism and a lower light-shielding mechanism installed on the guide rails in the hoistway, a photoelectric switch installed above the elevator car, and a control cabinet installed in the elevator machine room. The upper light-shielding mechanism and the lower light-shielding mechanism are respectively located at the upper and lower ends of the hoistway, and the photoelectric switch is connected to the control cabinet through the car trailing cable;

[0010] Both the upper light-shielding mechanism and the lower light-shielding mechanism include a bracket and a light-shielding plate capable of limiting the extreme position of the elevator car operation. The light-shielding plate is fixed at one end of the bracket, and the other end of the bracket is fixed to the guide rail.

[0011] Preferably, it further includes a car frame installed on one side of the elevator car. The photoelectric switch is installed at the upper end of the car frame by screws, and there is a gap between the photoelectric switch and the elevator car.

[0012] Preferably, the photoelectric switch includes an induction part and an installation part. The installation part is provided with an installation hole for screw installation. The induction part is provided with a notch, and the end of the light-shielding plate away from the bracket is located inside the notch.

[0013] Preferably, both ends of the bracket are respectively fixed to the light-shielding plate and the guide rail by bolts, and both ends of the bracket are provided with screw holes for bolt installation.

[0014] Preferably, the light-shielding plate includes a first light-shielding part, a second light-shielding part, and a notch part. The notch part is located between the first light-shielding part and the second light-shielding part, and the first light-shielding part, the notch part, and the second light-shielding part form a U-shaped structure.

[0015] Preferably, when the induction part is located in the first light-shielding part or the second light-shielding part, the photoelectric switch is triggered, and when the induction part is located in the notch part, the photoelectric switch does not act.

[0016] Preferably, the length of the first light-shielding part is greater than the length of the second light-shielding part, and the width of the first light-shielding part is different from the width of the second light-shielding part.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] 1. Through the cooperation of the photoelectric switch with the upper light-shielding mechanism and the lower light-shielding mechanism, when the sensing part of the photoelectric switch is blocked by the upper light-shielding mechanism or the lower light-shielding mechanism, it is triggered to stop the elevator operation, effectively improving the safety of elevator operation. The signal of the photoelectric switch is transmitted to the control cabinet in the machine room through the car trailing cable, and there is no need to lay cables separately. Without the restraint of cables, the installation is simpler, the position adjustment is more convenient, and only one photoelectric switch is needed, reducing the detection cost of the extreme positions of the elevator car.

[0019] 2. Through the light-shielding plate that can limit the extreme positions of the elevator car operation, it can accurately control the on-off and on-off duration of the photoelectric switch signal, and then cooperate with the control software to analyze the number and duration of the on-off of the elevator car, so as to accurately judge the upper extreme position and the lower extreme position of the elevator car in the hoistway, thereby improving the detection accuracy of the extreme positions of the elevator car. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present utility model;

[0021] Figure 2 is a schematic side view structural diagram of the present utility model;

[0022] Figure 3 is the present utility model Figure 2 a schematic cross-sectional structural diagram in the A direction of the present utility model;

[0023] Figure 4 is the present utility model Figure 2 a schematic cross-sectional structural diagram in the B direction of the present utility model;

[0024] Figure 5 is a schematic structural diagram of the prior art;

[0025] Figure 6 is a schematic structural diagram when the elevator car of the prior art runs to the lower end of the hoistway.

[0026] In the figure: 1. Elevator car; 2. Car trailing cable; 3. Photoelectric switch; 31. Installation part; 32. Sensing part; 4. Upper light-shielding mechanism; 41. Bracket; 42. Light-shielding plate; 421. First light-shielding part; 422. Notch part; 423. Second light-shielding part; 5. Lower light-shielding mechanism; 6. Guide rail; 7. Hoistway; 8. Car frame; 9. Notch; 10. Control cabinet; 11. Elevator machine room; 12. Bolt; 13. Switch cable; 14. Bumper; 15. Limit switch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1-4 , the present invention provides a technical solution: an elevator car position detection device, which includes an upper light-shielding mechanism 4 and a lower light-shielding mechanism 5 installed on the guide rail 6 in the hoistway 7, a photoelectric switch 3 installed above the elevator car 1, and a control cabinet 10 installed in the elevator machine room 11. The upper light-shielding mechanism 4 and the lower light-shielding mechanism 5 are respectively located at the upper and lower ends of the hoistway 7. The photoelectric switch 3 is connected to the control cabinet 10 through the car trailing cable 2. When the sensing part 32 of the photoelectric switch 3 is blocked by the upper light-shielding mechanism 4 or the lower light-shielding mechanism 5, it is triggered to stop the elevator from running, effectively improving the safety of elevator operation. The signal of the photoelectric switch 3 is transmitted to the control cabinet 10 in the machine room through the car trailing cable 2, and there is no need to lay cables separately. Due to the lack of cable constraints, the installation is simpler and the position adjustment is more convenient. Moreover, only one photoelectric switch 3 is needed, reducing the detection cost of the extreme position of the elevator car 1.

[0029] It also includes a car frame 8 installed on one side of the elevator car 1. The photoelectric switch 3 is installed at the upper end of the car frame 8 by screws, and there is a gap between the photoelectric switch 3 and the elevator car 1, improving the convenience of installing the photoelectric switch 3. The photoelectric switch 3 is non-contact, so that the photoelectric switch 3 is not affected by mechanical impact during the triggering process, the service life of the photoelectric switch 3 is longer, and the speed that the photoelectric switch 3 can recognize is higher, the action response is more sensitive, and it is safe and reliable.

[0030] Both the upper light-shielding mechanism 4 and the lower light-shielding mechanism 5 include a bracket 41 and a light-shielding plate 42 that can limit the extreme position of the elevator car 1 during operation. The light-shielding plate 42 is fixed to one end of the bracket 41, and the other end of the bracket 41 is fixed to the guide rail 6, so that the light-shielding plate 42 installed on the car guide rail 6 triggers the switch in the physical form of blocking the light beam in the photoelectric switch 3, without the need to connect cables, reducing the amount of cable used.

[0031] The photoelectric switch 3 includes a sensing part 32 and an installation part 31. The installation part 31 is provided with installation holes for screw installation. The sensing part 32 is provided with a notch 9. The end of the light-shielding plate 42 away from the bracket 41 is located inside the notch 9, which is convenient for using the light-shielding plate 42 to block the light beam in the photoelectric switch 3 to trigger the action of the photoelectric switch 3, and using the on-off signal of the photoelectric switch 3 to control the stop and operation of the elevator.

[0032] Both ends of the bracket 41 are respectively fixed to the light-shielding plate 42 and the guide rail 6 through bolts 12, and screw holes for installing the bolts 12 are provided at both ends of the bracket 41, which improves the convenience of installing the bracket 41 with the guide rail 6 and the light-shielding plate 42. At the same time, the position of the light-shielding plate 42 relative to the guide rail 6 is fixed, improving the accuracy of detecting the extreme positions of the elevator car 1.

[0033] The light-shielding plate 42 includes a first light-shielding portion 421, a second light-shielding portion 423, and a notch portion 422. The notch portion 422 is located between the first light-shielding portion 421 and the second light-shielding portion 423. The first light-shielding portion 421, the notch portion 422, and the second light-shielding portion 423 form a U-shaped structure. When the sensing portion 32 is located in the first light-shielding portion 421 or the second light-shielding portion 423, the photoelectric switch 3 is triggered, and a trigger signal is transmitted to the control cabinet 10 to control the start and stop operation of the elevator through the control cabinet 10. When the sensing portion 32 is located in the notch portion 422, the photoelectric switch 3 does not act, and the elevator directly stops running.

[0034] The length of the first light-shielding portion 421 is greater than the length of the second light-shielding portion 423, and the width of the first light-shielding portion 421 is different from the width of the second light-shielding portion 423. The lengths of the first light-shielding portion 421 and the second light-shielding portion 423 are used to control the duration of the photoelectric switch 3 being triggered. A traction machine encoder is installed on the traction machine. The control cabinet 10 analyzes the upper and lower extreme positions of the car in the hoistway 7 by combining the signal of the photoelectric switch 3 with the rotation direction signal of the traction machine encoder or the rotation direction signal of the speed limiter encoder. It is also possible to set notch portions 422 on the light-shielding plates 42 at the upper and lower extremes, and there are changes in the number and length of the notches. When the photoelectric switch 3 passes through the light-shielding plate 42, because there are notches on the light-shielding plate 42, the on-off of the signal of the photoelectric switch 3 and the judgment of the on-off duration can be realized. By analyzing the number and duration of the on-off of the elevator car 1 through the control software, the upper and lower extreme positions of the elevator car 1 in the hoistway 7 are judged.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elevator car position detection device, characterized in that: It includes an upper light-shielding mechanism (4) and a lower light-shielding mechanism (5) installed on the guide rails (6) in the hoistway (7), a photoelectric switch (3) installed above the elevator car (1), and a control cabinet (10) installed in the elevator machine room (11). The upper light-shielding mechanism (4) and the lower light-shielding mechanism (5) are respectively located at the upper and lower ends of the hoistway (7), and the photoelectric switch (3) is connected to the control cabinet (10) through the car trailing cable (2). Both the upper light-shielding mechanism (4) and the lower light-shielding mechanism (5) include a bracket (41) and a light-shielding plate (42) capable of limiting the extreme position of the elevator car (1) during operation. The light-shielding plate (42) is fixed to one end of the bracket (41), and the other end of the bracket (41) is fixed to the guide rail (6).

2. An elevator car position detection device according to claim 1, characterized in that: It also includes a car frame (8) installed on one side of the elevator car (1). The photoelectric switch (3) is installed at the upper end of the car frame (8) by screws, and there is a gap between the photoelectric switch (3) and the elevator car (1).

3. An elevator car position detection device according to claim 2, characterized in that: The photoelectric switch (3) includes an induction part (32) and a mounting part (31). The mounting part (31) is provided with mounting holes for screws. The induction part (32) is provided with a notch (9), and the end of the light-shielding plate (42) away from the bracket (41) is located inside the notch (9).

4. An elevator car position detection device according to claim 3, characterized in that: Both ends of the bracket (41) are respectively fixed to the light-shielding plate (42) and the guide rail (6) by bolts (12), and both ends of the bracket (41) are provided with screw holes for installing the bolts (12).

5. An elevator car position detection device according to claim 4, characterized in that: The light-shielding plate (42) includes a first light-shielding part (421), a second light-shielding part (423) and a notch part (422). The notch part (422) is located between the first light-shielding part (421) and the second light-shielding part (423). The first light-shielding part (421), the notch part (422) and the second light-shielding part (423) form a C-shaped structure.

6. An elevator car position detection device according to claim 5, characterized in that: When the induction part (32) is located at the first light-shielding part (421) or the second light-shielding part (423), the photoelectric switch (3) is triggered. When the induction part (32) is located at the notch part (422), the photoelectric switch (3) does not act.

7. An elevator car position detection device according to claim 6, characterized in that: The length of the first light-shielding part (421) is greater than the length of the second light-shielding part (423), and the width of the first light-shielding part (421) is different from the width of the second light-shielding part (423).

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