Photoelectric switch for elevator without car platform

Abstract

The photoelectric switch comprises photoelectric groups, a detection area and an elevator car platform, the three photoelectric groups are installed in a switch support and correspondingly fixed to the three edges of the elevator car platform, an elevator back plate is arranged on the outer side of the elevator car platform, and the detection area is arranged on the outer side of the elevator back plate. According to the photoelectric switch for the elevator without the lift car platform, the three photoelectric groups cover the gap between the lift car bottom and the shaft wall, the fan-shaped detection area can detect the approaching of people or objects in time, accidents such as clamping injury caused by the gap between the lift car bottom and the shaft wall when passengers take the elevator are avoided, the safety of the elevator without the lift car platform is effectively improved, and the photoelectric groups are small in size and convenient to use. After being installed, the device does not exceed the edge of the car bottom, does not occupy extra space, meets the detection requirement, does not affect the normal operation space and appearance design of the elevator, and is high in adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of photoelectric switches for elevators, in particular to a photoelectric switch for elevators without a car platform. Background Art

[0002] In modern buildings, the use of elevators is becoming more and more popular. Due to their unique advantages, such as small space occupation, low civil engineering requirements, and relatively low cost, elevators without car platforms have been widely used in some scenarios. However, due to their structural characteristics, elevators without car platforms face some special challenges in terms of safety protection.

[0003] Unlike traditional car elevators, platformless elevators lack independent car walls, and there is a certain gap between the car bottom and the shaft wall. This gap can easily cause passengers to accidentally fall, be pinched, and other safety accidents during elevator operation. According to relevant statistics, among elevator safety accidents, the proportion of accidents caused by the gap between the car bottom and the shaft wall cannot be ignored, which seriously threatens the lives of passengers. Existing elevator safety protection devices have certain limitations when dealing with this special gap problem of platformless elevators. For example, traditional light curtain sensors are mainly used to detect whether there are objects blocking the elevator doors. Their detection area and method cannot effectively cover the gap area between the car bottom and the shaft wall. Some other detection devices are either too large and will extend beyond the edge of the car bottom after installation, taking up additional space and affecting the normal operating space and appearance design of the elevator; or the detection accuracy and timeliness are insufficient, making it difficult to detect in time when people or objects approach the gap, and thus unable to provide reliable safety protection for passengers.

[0004] To this end, the present invention provides a photoelectric switch for an elevator without a car platform. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a photoelectric switch for an elevator without a car platform to solve the above problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a photoelectric switch for an elevator without a car platform, including a photoelectric group, a detection area and an elevator car bottom, three groups of the photoelectric groups are respectively installed in the switch bracket and fixed correspondingly on the three sides of the elevator car bottom, and an elevator backboard is provided on the outer side of the elevator car bottom.

[0007] Preferably, the width and height of the photoelectric group do not exceed 2 cm, and after installation, the whole does not exceed the edge contour of the elevator car bottom.

[0008] Preferably, the three photoelectric groups are installed on the front, left and right sides of the elevator car bottom, and the switch bracket is fixed to the edge of the elevator car bottom and maintains a distance from the elevator backboard.

[0009] Preferably, the detection distance of the photoelectric group is between two photoelectric sensors, the detection width is 5 mm, and the detection area covers three sides of the elevator car bottom.

[0010] Preferably, the switch bracket is made of aluminum alloy or engineering plastic, and the surface of the bracket is provided with bolt holes for fixed connection with the elevator car bottom.

[0011] Preferably, the surface color of the switch bracket is consistent with the appearance color of the elevator back panel or the elevator car bottom, and is processed by spraying or electroplating process.

[0012] Beneficial effects

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The photoelectric switch used for elevators without car platforms has three photoelectric groups covering the gap between the elevator car bottom and the shaft wall. The fan-shaped detection area can detect people or objects approaching in time, avoiding accidents such as passengers being pinched by the gap between the car bottom and the shaft wall when riding the elevator, effectively improving the safety of elevators without car platforms. The photoelectric group is small in size and does not exceed the edge of the car bottom after installation, and does not take up additional space. It can meet the detection requirements without affecting the normal operating space and appearance design of the elevator, and has strong adaptability.

[0015] (2) The photoelectric switch used in elevators without car platforms has a detection distance set at 5-10 cm. It can accurately identify objects in the gap area and trigger the alarm or braking mechanism in time within the effective distance to prevent dangerous situations and improve the reliability and accuracy of detection. The switch bracket is made of aluminum alloy or engineering plastic, which has high strength, wear resistance and corrosion resistance. It is fixed to the car bottom through bolt holes and has a stable connection to ensure that the photoelectric group maintains stable detection performance during the long-term operation of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a plan view of the present invention;

[0017] Figure 2 It is a schematic elevation view of the present invention.

[0018] In the figure: 1. Photoelectric group; 2. Detection area; 3. Elevator car platform; 4. Elevator back panel. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-2 A photoelectric switch for an elevator without a car platform includes a photoelectric group 1, a detection area 2 and an elevator car bottom 3. Three groups of photoelectric groups 1 are respectively installed in the switch bracket and fixed correspondingly on the three sides of the elevator car bottom 3. An elevator backboard 4 is provided on the outside of the elevator car bottom 3.

[0021] Specifically: the width and height of the photoelectric group 1 do not exceed 2 cm, and after installation, the whole does not exceed the edge contour of the elevator car bottom 3. Three groups of photoelectric groups 1 are installed on the front, left and right sides of the elevator car bottom 3, and the switch bracket is fixed to the edge of the elevator car bottom 3 and maintains a distance from the elevator back panel 4.

[0022] It should be noted that the detection distance of the photoelectric group 1 is between two photoelectric sensors, the detection width is 5mm, the bottom of the detection area 2 covers three sides of the elevator car bottom 3, the switch bracket is made of aluminum alloy or engineering plastic, and the surface of the bracket is provided with bolt holes for fixed connection with the elevator car bottom 3. The surface color of the switch bracket is consistent with the appearance color of the elevator back panel 4 or the elevator car bottom 3, and is processed by spraying or electroplating process.

[0023] Specifically, three photoelectric groups 1 are installed in switch brackets on the front, left, and right sides of the elevator car platform 3. The width and height of the photoelectric group 1 do not exceed 2 cm. After installation, the entire group does not extend beyond the edge contour of the elevator car platform 3, ensuring that it does not affect the normal operating space of the elevator.

[0024] As a further improvement to the present invention, the switch bracket is made of aluminum alloy or engineering plastic. Bolt holes are provided on the bracket surface for secure connection to the elevator car platform 3, allowing the bracket to be securely attached to the platform via bolts. Furthermore, the bracket surface is spray-painted or electroplated to a color consistent with the elevator back panel 4 or elevator platform 3. This enhances the aesthetics while maintaining structural strength and providing a stable mounting base for the photoelectric group 1. The bracket is fixed to the edge of the elevator platform 3 and maintains a distance from the elevator back panel 4.

[0025] Specifically, the detection distance of each photoelectric group 1 is between two photoelectric sensors, the detection width is 5mm, and the detection area 2 covers three sides of the elevator car platform 3, accurately covering the gap between the car platform and the shaft wall, ensuring that the dangerous area is within the effective monitoring range.

[0026] At the same time, the contents not described in detail in this specification belong to the existing technology well known to those skilled in the art.

[0027] Working principle: When the elevator is running, photoelectric group 1 continuously emits infrared light or other types of light beams, forming a stable light signal covering the sector-shaped detection area 2. If there is no object blocking the detection area, the receiver of photoelectric group 1 can normally receive the light signal emitted by the transmitter, and the elevator operates normally;

[0028] If a person or object approaches or enters the gap between the elevator car platform 3 and the hoistway wall, the light beam is blocked, and the optical signal received by the receiver is weakened or interrupted. The photoelectric conversion elements within the photoelectric group 1 convert the changes in the optical signal into changes in the electrical signal. After amplification and filtering, this electrical signal is processed by circuits before being transmitted to the elevator control system. Upon receiving the abnormal electrical signal, the elevator control system triggers appropriate safety mechanisms, such as immediately stopping the elevator and issuing an alarm.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A photoelectric switch for an elevator without a car platform, comprising a photoelectric group (1), a detection area (2) and an elevator car platform (3), characterized in that: The three groups of photoelectric groups (1) are respectively installed in the switch bracket and fixed on the three sides of the elevator car bottom (3) respectively. The outer side of the elevator car bottom (3) is provided with an elevator backboard (4).

2. A photoelectric switch for an elevator without a car platform according to claim 1, characterized in that: The width and height of the photoelectric group (1) do not exceed 2 cm, and after installation, the entire group does not exceed the edge contour of the elevator car platform (3).

3. The photoelectric switch for an elevator without a car platform according to claim 1, characterized in that: Three photoelectric groups (1) are installed on the front, left and right sides of the elevator car platform (3), and the switch bracket is fixed to the edge of the elevator car platform (3) and maintains a distance from the elevator backboard (4).

4. The photoelectric switch for an elevator without a car platform according to claim 1, characterized in that: The detection distance of the photoelectric group (1) is between two photoelectric devices, the detection width is 5 mm, and the detection area (2) covers three sides of the elevator car bottom (3).

5. The photoelectric switch for an elevator without a car platform according to claim 1, characterized in that: The switch bracket is made of aluminum alloy or engineering plastics, and the surface of the bracket is provided with bolt holes for fixed connection with the elevator car bottom (3).

6. The photoelectric switch for an elevator without a car platform according to claim 1, characterized in that: The surface color of the switch bracket is consistent with the appearance color of the elevator back panel (4) or the elevator car bottom (3), and is processed by spraying or electroplating process.

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