Foreign matter detection system for electric furniture, anti-pinch device and electric bed

Abstract

The utility model discloses a foreign matter detection system for electric furniture, an anti-pinch device and an electric bed. The foreign matter detection system for the electric furniture comprises a main sensor and an auxiliary sensor, the input end of the main sensor is connected with the output end of the auxiliary sensor, and the output end of the main sensor is connected with a controller; the main sensor and the auxiliary sensor are arranged on the electric furniture, and the main sensor and the auxiliary sensor are used for detecting whether foreign matters exist in an action range of a movable part of the electric furniture or not. The electric furniture anti-pinch system solves the technical problems that an existing electric furniture anti-pinch system is slow in response and low in safety.

Description

Technical Field

[0001] This utility model relates to the field of electric furniture technology, specifically to a foreign object detection system, an anti-pinch device, and an electric bed for electric furniture. Background Technology

[0002] Electric furniture, especially electric beds, is widely popular due to its flexible and versatile bed board adjustment functions. However, with the increasing prominence of product safety issues, higher requirements have been placed on the safety performance of electric furniture.

[0003] Currently, most traditional anti-pinch systems for electric furniture on the market use contact-type pressure strip anti-pinch technology. While this technology can prevent injuries to people to some extent, it has significant limitations. First, the pressure strips are relatively expensive, increasing the manufacturing cost of electric furniture. Second, the reaction time is slow; the anti-pinch system is only triggered when an object is actually pressed against it, which may result in injury to a person or object before the anti-pinch mechanism is activated. Furthermore, this contact-type anti-pinch method cannot monitor the surrounding environment in real time. When operators use remote controls to move the movable parts of the electric furniture, their limited field of vision may prevent them from promptly noticing potential safety hazards.

[0004] There is currently no effective solution to the above problems. Utility Model Content

[0005] The main objective of this utility model embodiment is to provide a foreign object detection system, an anti-pinch device, and an electric bed for electric furniture, so as to at least solve the technical problems of slow response and low safety of current electric furniture anti-pinch systems.

[0006] To achieve the above objectives, this utility model provides a foreign object detection system for electric furniture, especially electric beds. The detection system sends a detection signal including a self-test signal and a foreign object signal to a controller (101). The detection system includes a main sensor (1) and a secondary sensor (2). The input end of the main sensor (1) is connected to the output end of the secondary sensor (2), and the output end of the main sensor (1) is connected to the controller (101). The main sensor (1) and the secondary sensor (2) are installed on the electric furniture (201). The main sensor (1) and the secondary sensor (2) are used to detect whether there are foreign objects within the range of motion of the movable parts of the electric furniture (201).

[0007] Optionally, the main sensor (1) and the auxiliary sensor (2) are also used to perform self-testing of the foreign object detection system, including: the auxiliary sensor (2) performs self-testing and transmits a first self-test success signal to the main sensor (1) through the output terminal of the auxiliary sensor (2); the main sensor (1) receives the first self-test success signal and performs self-testing, and transmits a second self-test success signal to the controller (101) through the output terminal of the main sensor (1); the controller (101) receives the second self-test success signal and enables the foreign object detection function of the foreign object detection system.

[0008] Optionally, the above system further includes multiple sub-sensors (2), wherein the multiple sub-sensors (2) are connected in series; at least one sub-sensor (2) whose input terminal is not connected to other sub-sensors (2) and one sub-sensor (2) whose output terminal is not connected to other sub-sensors (2); the output terminal of the sub-sensor (2) whose output terminal is not connected to other sub-sensors (2) is connected to the input terminal of the main sensor (1); the sub-sensor (2) whose input terminal is not connected to other sub-sensors (2) performs a self-test and transmits the corresponding self-test success signal to the next sub-sensor (2) through its output terminal; each sub-sensor (2) performs a self-test after receiving the self-test success signal corresponding to the previous sub-sensor (2) and outputs its corresponding self-test success signal; the sub-sensor (2) whose output terminal is not connected to other sub-sensors (2) transmits the corresponding self-test success signal to the main sensor (1) through its output terminal.

[0009] Optionally, when the main sensor (1) and / or the auxiliary sensor (2) detect a foreign object, the main sensor (1) and / or the auxiliary sensor (2) output a foreign object signal, including: when the input terminal of the main sensor (1) and / or the auxiliary sensor (2) receives the foreign object signal, the main sensor (1) and / or the auxiliary sensor (2) outputs the foreign object signal from the output terminal; when the controller (101) receives the foreign object signal output by the main sensor (1), it issues a stop command to the motor controlling the movable part.

[0010] Optionally, the main sensor (1) and the auxiliary sensor (2) also include a feedback device. After the main sensor (1) and the auxiliary sensor (2) perform self-tests, they output a self-test success signal and simultaneously control the feedback device to start. The feedback device is used to reflect the working status of the corresponding sensor.

[0011] Optionally, the system further includes: a plurality of sub-sensors (2), wherein the number of the plurality of sub-sensors (2) is determined based on the size of the electric furniture (201); the plurality of sub-sensors (2) are installed on the back and feet of the electric furniture (201), wherein the detection range of the plurality of sub-sensors (2) and the main sensor (1) covers the range of motion of the movable parts of the electric furniture (201).

[0012] Optionally, both the main sensor (1) and the secondary sensor (2) are infrared pyroelectric sensors, used to detect in real time whether there are foreign objects in the moving parts of the electric furniture (201) under non-contact conditions.

[0013] Optionally, the main sensor (1) and the auxiliary sensor (2) are installed on the electric furniture (201) in at least one of the following ways: adsorption type, hook type and fixed type, wherein the adsorption type is used to adsorb the main sensor (1) and the auxiliary sensor (2) onto the frame of the electric furniture (201) when the frame of the electric furniture (201) is made of metal or magnetic material, the hook type is used to suspend the main sensor (1) and the auxiliary sensor (2) onto the frame of the electric furniture (201), and the fixed type is used to directly fix the main sensor (1) and the auxiliary sensor (2) onto the frame of the electric furniture (201).

[0014] According to another aspect of the present invention, an anti-pinch device for electric furniture, especially an electric bed, is also provided, comprising: a controller (101) and any of the above-mentioned foreign object detection systems for electric furniture (201), wherein the controller (101) is used to control the operation of the electric furniture (201) based on the detection results of the main sensor (1) and the sub-sensor (2).

[0015] According to another aspect of the present invention, an electric bed is also provided, comprising: a bed board, a bed frame, a motor, a controller (101), and any one of the above-mentioned foreign object detection systems for electric furniture (201).

[0016] In this embodiment of the utility model, by combining the main sensor and the secondary sensor, the presence of foreign objects in electric furniture, especially in the range of motion of the electric bed board, is detected comprehensively and accurately. This achieves the purpose of avoiding injury to foreign objects or the human body when the electric furniture is adjusted, thereby improving the safety of electric furniture and solving the technical problems of slow response and low safety of current electric furniture anti-pinch systems. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a structural block diagram of a foreign object detection system for electric furniture according to an embodiment of the present utility model;

[0019] Figure 2 This is a structural block diagram of an optional series-connected foreign object detection system according to an embodiment of the present utility model;

[0020] Figure 3 This is an installation diagram of an optional "one-to-three" scheme for an electric bed provided according to an embodiment of the present utility model;

[0021] Figure 4 This is an installation diagram of an optional "one-to-four" scheme for an electric bed provided according to an embodiment of the present utility model;

[0022] Figure 5 This is a structural block diagram of an optional parallel structure foreign object detection system according to an embodiment of the present utility model;

[0023] Figure 6 This is a structural block diagram of an optional foreign object detection system including a signal link according to an embodiment of the present utility model;

[0024] Figure 7 This is a structural block diagram of an optional wired "one-to-four" solution provided according to an embodiment of the present utility model;

[0025] Figure 8 This is a structural block diagram of an optional series-connected anti-pinch device for an electric bed, according to an embodiment of the present invention.

[0026] The above figures include the following reference numerals:

[0027] 1. Main sensor; 2. Secondary sensor; 3. Signal link; 101. Controller; 201. Electric furniture. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0032] In the field of electric furniture technology, especially in the design and manufacture of electric beds, safety performance is a key indicator for measuring product quality. However, current anti-pinch systems have certain problems: traditional anti-pinch systems use contact-type pressure strip technology, which only triggers the anti-pinch mechanism after a person or object is actually pinched, a process that may cause injury; contact-type anti-pinch systems have a long response time because they are only triggered after actual contact; the pressure strips in traditional contact-type anti-pinch systems are expensive, and installation and maintenance costs are also considerable; and when the anti-pinch device itself malfunctions, it cannot be detected and prevented in a timely manner.

[0033] Therefore, this utility model provides a highly accurate and safe foreign object detection system for electric furniture. Figure 1 This is a structural block diagram of a foreign object detection system for electric furniture according to an embodiment of the present invention, as shown below. Figure 1 As shown, the foreign object detection system for electric furniture includes: a main sensor 1 and a secondary sensor 2, wherein the input end of the main sensor 1 is connected to the output end of the secondary sensor 2, and the output end of the main sensor 1 is connected to the controller 101; the main sensor 1 and the secondary sensor 2 are disposed on the electric furniture 201, wherein the main sensor 1 and the secondary sensor 2 are used to detect whether there are foreign objects within the range of motion of the movable parts of the electric furniture 201.

[0034] like Figure 1As shown, the foreign object detection system is an external system for the electric furniture. The controller can be a control box. The output of the main sensor 1 is connected to the multi-function interface of the controller 101 and communicates with the controller 101. If the foreign object detection system is not connected or either the main sensor 1 or the secondary sensor 2 malfunctions, the controller 101 will not receive a signal from the foreign object detection system, will consider it a malfunction, and the electric furniture 201 will not be able to operate normally. The input of the main sensor 1 and the output of the secondary sensor 2 are connected sequentially to form a chain communication network. When the secondary sensor 2 detects a foreign object within the operating range of a movable part of the electric furniture, it immediately sends a signal to its connected upstream sensor (i.e., the previous secondary sensor 2 or the main sensor 1). This signal is transmitted upwards along the chain network until it reaches the main sensor 1. Upon receiving the foreign object signal, the main sensor 1 quickly forwards it to the controller 101, triggering the anti-pinch mechanism. Additionally, each time the electric furniture 201 is started or periodically operated, the foreign object detection system performs a self-test. Each sensor, after completing its self-test, sends a successful self-test signal to its connected upstream sensor. Finally, after completing its self-test, the main sensor 1 reports a successful self-test to the controller 101, allowing the electric furniture 201 to operate normally. This mechanism ensures the high reliability of the anti-pinch system.

[0035] The foreign object detection system for electric furniture includes a main sensor 1 and a secondary sensor 2. The input terminal of the main sensor 1 is connected to the output terminal of the secondary sensor 2, and the output terminal of the main sensor 1 is connected to the controller 101. The main sensor 1 and the secondary sensor 2 are installed on the electric furniture 201. The main sensor 1 and the secondary sensor 2 are used to detect whether there are foreign objects within the range of motion of the movable parts of the electric furniture 201. This achieves the purpose of avoiding injury to foreign objects or people when the electric furniture is adjusted, thereby improving the safety of electric furniture and solving the technical problems of slow response and low safety of current electric furniture anti-pinch systems.

[0036] As an optional embodiment, the main sensor 1 and the auxiliary sensor 2 are also used to perform a self-test of the foreign object detection system, including: the auxiliary sensor 2 performs a self-test and transmits a first self-test success signal to the main sensor 1 through the output terminal of the auxiliary sensor 2; the main sensor 1 receives the first self-test success signal and performs a self-test, and transmits a second self-test success signal to the controller 101 through the output terminal of the main sensor 1; the controller 101 receives the second self-test success signal and enables the foreign object detection function of the foreign object detection system.

[0037] Optionally, when the electric furniture 201 is started, the secondary sensor 2 can perform a self-test. The self-test includes checking the responsiveness of the infrared pyroelectric detection element, the integrity of the circuit, and the reliability of the signal transmission link. If all self-test items of the secondary sensor 2 pass, i.e., the detection element functions normally, the circuit is fault-free, and the signal transmission link is unobstructed, the secondary sensor 2 will generate a first self-test success signal. This signal indicates that the sensor is ready to perform foreign object detection. The secondary sensor 2 sends the first self-test success signal to the main sensor 1 through its output terminal to ensure accurate signal transmission. The main sensor 1 receives the first self-test success signal from the secondary sensor 2 and verifies the signal to ensure its integrity and accuracy, i.e., the secondary sensor 2 has completed its self-test and is fault-free. After verifying the signal from the secondary sensor 2, the main sensor 1 also performs a self-test to ensure that its own infrared pyroelectric detection function, circuit status, and signal transmission capability are all normal. If the self-test result of the main sensor 1 is also successful, i.e., all self-test items pass, the main sensor 1 will generate a second self-test success signal, indicating that the entire foreign object detection system is ready. The main sensor 1 sends a second self-test success signal to the controller 101 through its output terminal. This is a confirmation signal that the system is ready. After receiving the second self-test success signal from the main sensor 1, the controller 101 analyzes the signal to confirm that the entire system has completed the self-test and is in good condition without any faults or abnormalities. Once the controller 101 confirms that all sensors have successfully completed their self-tests, it can activate the foreign object detection function of the foreign object detection system, allowing the system to enter normal operating condition and monitor in real time whether there are any foreign objects within the range of motion of the movable parts of the electric furniture 201.

[0038] As an optional embodiment, the system further includes multiple sub-sensors 2, which are connected in series. At least one sub-sensor 2 has an input terminal not connected to any other sub-sensor 2 and an output terminal not connected to any other sub-sensor 2. The output terminal of the sub-sensor 2 not connected to any other sub-sensor 2 is connected to the input terminal of the main sensor 1. The sub-sensor 2 not connected to any other sub-sensor 2 performs a self-test and transmits the corresponding self-test success signal to the next sub-sensor 2 through its output terminal. Each sub-sensor 2 performs a self-test after receiving the self-test success signal from the previous sub-sensor 2 and outputs its corresponding self-test success signal. The sub-sensor 2 not connected to any other sub-sensor 2 transmits its corresponding self-test success signal to the main sensor 1 through its output terminal.

[0039] Optionally, the system provided in this embodiment may include multiple sub-sensors 2. These sub-sensors 2 can be configured to be connected in series, meaning the output of each sub-sensor 2 is connected to the input of the next sub-sensor 2, forming a signal transmission chain. This series design allows the signal to start from the last sub-sensor 2, pass through one sub-sensor after another, and finally reach the main sensor 1. For example, Figure 2 This is a structural block diagram of an optional series-connected foreign object detection system according to an embodiment of the present invention, such as... Figure 2 As shown, four sensors can be equipped, including one main sensor 1 and three auxiliary sensors 2. Each sensor has a circuit board. Two sensors are mounted on the back and two are mounted on the feet, ensuring coverage of all areas where the movable parts of the electric furniture can move. This scheme can be called a one-to-three scheme, i.e., one main sensor 1 and three auxiliary sensors 2. After the third auxiliary sensor 2 successfully self-tests, it will transmit a signal to the second auxiliary sensor 2. The second auxiliary sensor 2 receives the self-test success signal from the third auxiliary sensor 2 and also successfully self-tests itself, and will then transmit a self-test success signal to the previous auxiliary sensor 2. This process continues sequentially. Finally, the main sensor 1 receives the self-test success signals from all the auxiliary sensors 2 and successfully self-tests itself, and will then transmit a signal to the controller 101. Only then will the controller 101 function normally (otherwise, an error will occur). The transmission of foreign object signals is the same. If any sensor detects a foreign object, it will send a signal to the next sensor. Finally, the main sensor 1 will send the foreign object signal to the controller 101, and then the controller 101 will issue a stop command to the motor.

[0040] Optionally, the main sensor 1 and multiple auxiliary sensors 2 are equipped with a marking function. They can superimpose a marking signal on the detected foreign object signal and send a second foreign object signal to the upper sensor. Finally, the main sensor 1 sends the second foreign object signal to the controller 101. Then, the controller 101 identifies the specific sensor that detected the foreign object signal and issues a stop command to the motor.

[0041] In the series connection mechanism, the main sensor 1 can determine the presence of foreign objects and whether the system is in normal working condition based on the sequence and integrity of the signals. Once a foreign object or system malfunction is detected, the main sensor 1 will immediately send a corresponding stop command or fault signal to the controller, thereby triggering the anti-pinch mechanism or system maintenance procedure. The series connection ensures the integrity and reliability of the signals because the signals must pass through all the secondary sensors 2 to reach the main sensor 1. This not only prevents the signals from being erroneously modified or lost during transmission, but also ensures that the system can receive accurate status information from each secondary sensor 2, thereby making correct judgments and responses.

[0042] As an optional embodiment, when the main sensor 1 and / or the auxiliary sensor 2 detect a foreign object, they output a foreign object signal, including: when the input terminal of the main sensor 1 and / or the auxiliary sensor 2 receives the foreign object signal, the main sensor 1 and / or the auxiliary sensor 2 outputs the foreign object signal from the output terminal; when the controller 101 receives the foreign object signal output by the main sensor 1, it issues a stop command to the motor controlling the movable part.

[0043] Optionally, after receiving the foreign object signal output by the main sensor 1, the controller 101 immediately identifies a potential pinching risk within the operating range of the movable part. Based on the received foreign object signal, the controller 101 quickly sends a stop command to the control circuit of the electric furniture 201. This command immediately cuts off the power supply to the movable part (motor), stopping its movement within milliseconds and preventing further injury to the detected foreign object (especially a human body). In this embodiment, the secondary sensor 2 and the main sensor 1 constitute a highly sensitive and rapidly responding foreign object detection network, capable of real-time monitoring of abnormalities within the operating range of the movable parts of the electric furniture 201. Once a foreign object is detected, the controller 101 responds quickly by cutting off the motor power supply, ensuring the movable part stops moving immediately and effectively preventing pinching accidents. This design not only reflects a high level of concern for user safety but also significantly improves the technical standards of electric furniture in terms of safety through an intelligent sensor network and an instant-response control mechanism.

[0044] As an optional embodiment, the main sensor 1 and the auxiliary sensor 2 also include a feedback device. After the main sensor 1 and the auxiliary sensor 2 perform self-tests, they output a self-test success signal and simultaneously control the feedback device to start. The feedback device is used to reflect the working status of the corresponding sensor.

[0045] Optionally, when a sensor completes its self-test and outputs a successful self-test signal, its built-in feedback device is activated simultaneously. The feedback device can be an LED, LED, buzzer, or display screen, used to visually reflect the sensor's operating status. For secondary sensor 2, once the self-test is successful, its feedback device will display or emit a corresponding signal, such as an LED lighting up or a buzzer sounding briefly, indicating that the sensor is in good condition and ready. For primary sensor 1, similarly, after a successful self-test, the feedback device will activate to confirm the operating status of primary sensor 1, and simultaneously indicate that the entire system has passed the self-test and is ready to enter normal operating mode. The use of the feedback device allows users or maintenance personnel to visually see the operating status of each sensor, enabling quick judgment of system normality even in complex systems or with numerous sensors, thus improving system transparency. If the feedback device of a certain sensor fails to display or emit a successful self-test signal, the problematic sensor can be quickly located, facilitating troubleshooting and repair by maintenance personnel, reducing system maintenance time and complexity.

[0046] As an optional embodiment, the system further includes: a plurality of secondary sensors 2, wherein the number of secondary sensors 2 is determined based on the size of the electric furniture 201; the secondary sensors 2 are installed on the back and feet of the electric furniture 201, wherein the detection range of the secondary sensors 2 and the main sensor 1 covers the range of motion of the movable parts of the electric furniture 201.

[0047] Optionally, the size of the electric furniture 201 directly relates to the breadth and complexity of the range of motion of its movable parts. Therefore, this invention proposes a strategy for dynamically adjusting the number of secondary sensors 2, aiming to provide optimized anti-pinch protection for electric furniture of different sizes.

[0048] Specifically, for example, smaller electric beds have relatively limited range of motion for the back and legs. Therefore, the system can be configured with three secondary sensors (i.e., a "one-to-three" solution) to ensure effective coverage of all potential risk points within the bed's range of motion. Figure 3 This is an installation diagram of an optional "one-to-three" scheme for an electric bed provided by this utility model, as shown below. Figure 3 As shown, the main sensor 1 and three auxiliary sensors 2 are installed at the four corners of the bed board. This ensures close monitoring of the areas most likely to cause pinching injuries when the bed board moves up and down. For larger electric beds, with a wider range of motion and more risk points, the system can add several auxiliary sensors 2, such as configuring four auxiliary sensors 2 (i.e., a "one-to-four" solution), to further improve the comprehensiveness and safety of the detection. Figure 4 This is an installation diagram of an optional "one-to-four" scheme for an electric bed provided according to an embodiment of the present utility model, in order to cover a wider range of motion and reduce any potential risk of pinching injury.

[0049] Optionally, the secondary sensors 2 are installed in the back and foot areas of the electric furniture 201, based on a risk assessment during use. The back and foot areas are where the moving parts of the electric furniture 201 are most prone to pinching injuries during movement. The lifting and lowering movements of the moving parts in these areas may compress human body parts or other objects located below, leading to safety issues. Therefore, this invention specifically emphasizes installing a sufficient number of secondary sensors 2 in these critical areas to cover all possible pinching risk points.

[0050] This embodiment of the invention ensures that each part of the movable component of the electric furniture 201 within its range of motion is monitored by at least one sensor during movement by installing multiple secondary sensors 2 in the back and foot areas. Each secondary sensor 2 has a certain detection range, and through reasonable arrangement, these detection ranges overlap to form a comprehensive coverage of the range of motion of the movable component of the electric furniture 201. At the same time, it avoids false detection of the environment outside the electric furniture, ensuring that the detection range is limited to the movement area of ​​the movable component. Even when the movable component is performing complex movements, it can promptly and accurately detect potential foreign object intrusion and trigger the anti-pinch mechanism.

[0051] As an optional embodiment, the system may further include: a plurality of sub-sensors 2, wherein the plurality of sub-sensors 2 are connected in parallel; and the output terminals of each of the plurality of sub-sensors 2 are connected to the input terminal of the main sensor 1.

[0052] Optionally, the system provided in this embodiment of the present invention may include multiple secondary sensors 2, which may be configured to be connected in parallel in the system. Figure 5 This is a structural block diagram of an optional parallel structure foreign object detection system provided according to an embodiment of the present utility model, such as... Figure 5 As shown, all secondary sensors 2 are configured to be independent of each other, but are connected to the input terminal of the main sensor 1. This connection method differs from series connection, where the signal needs to be transmitted step by step through a chain path; while in parallel connection, each secondary sensor 2 can independently detect its surrounding environment and send detection signals directly to the main sensor 1 without the need for relay through other sensors.

[0053] Because the output of each secondary sensor 2 is directly connected to the input of the main sensor 1, the transmission path of the detection signal is greatly simplified. Once a secondary sensor 2 detects a foreign object, it can immediately send an alarm signal to the main sensor 1 through its output, without waiting for signals from other sensors or through intermediate sensors. This direct communication mechanism greatly improves the signal transmission speed and ensures the immediate response of the foreign object detection system to foreign objects. The parallel connection between the secondary sensor 2 and the main sensor 1 is not only used for foreign object detection but also supports the system's self-test function. During system startup or periodic self-tests, the main sensor 1 sends a self-test signal to all secondary sensors 2, and each secondary sensor 2, after completing its self-test, directly sends a self-test success signal to the main sensor 1. The main sensor 1 can simultaneously receive and process the self-test signals from all secondary sensors 2. Once a fault is detected in any sensor, it immediately reports to the controller, triggering a system-level fault response, such as stopping the movement of the bed board and prompting the user for maintenance.

[0054] As an optional embodiment, the above system may further include: a signal link 3, wherein the main sensor 1 and the sub-sensor 2, and the main sensor 1 and the controller 101 are connected through the signal link 3, wherein the signal link 3 includes at least one of the following: a wired link and a wireless link.

[0055] Optionally, Figure 6 This is a structural block diagram of an optional foreign object detection system including a signal link according to an embodiment of the present invention, such as... Figure 6 As shown, signal link 3 is designed to provide a stable, efficient, and reliable communication channel between the main sensor 1 and the secondary sensor 2, and between the main sensor 1 and the controller 101. Whether it is a wired or wireless link, signal link 3 must ensure fast and accurate signal transmission to support the instantaneous response and fault detection functions of the anti-pinch system.

[0056] Through a wired link, the main sensor 1 can receive detection signals and self-test signals from each of the secondary sensors 2 in real time, ensuring the immediacy and integrity of the information. Wired links typically use dedicated communication lines, such as data lines or signal lines. These lines connect directly to the sensors, providing a physically stable transmission path, reducing signal interference and delay, and are particularly suitable for scenarios requiring high-speed and stable communication. Figure 7 This is a structural block diagram of an optional wired "one-to-four" solution provided according to an embodiment of the present utility model, as shown below. Figure 7 As shown, due to the different installation positions of the different sensors, the length of the connecting wire between each pair of sensors is also different.

[0057] The wireless link provides the system with another flexible communication method. Through wireless communication technologies such as Wi-Fi, Bluetooth, or proprietary wireless communication protocols, the secondary sensor 2 can transmit the detection signal to the main sensor 1 step by step. The main sensor 1 can then wirelessly transmit the received signals (including foreign object detection signals and self-test result signals) to the controller 101. The use of the wireless link significantly improves the ease of installation and application range of the system, eliminating the need for complex wiring, reducing the probability of failures due to wiring problems, and supporting stable signal communication in various usage scenarios of the electric furniture 201.

[0058] The foreign object detection system design provided in this embodiment allows the signal link 3 to include at least one of wired and wireless links, enabling the system to flexibly select the most suitable communication method. For example, for short-range, high-speed data transmission between the secondary sensor 2 and the primary sensor 1, a wired link may be a better choice; while for long-range communication between the primary sensor 1 and the controller 101, a wireless link offers greater flexibility and convenience. Regardless of whether it is a wired or wireless link, the signal link 3 must ensure reliable signal transmission. In a wired link, high-quality communication lines and anti-interference design ensure signal stability; while in a wireless link, mature wireless communication technologies, such as Automatic Repeat Request (ARQ) and Forward Error Correction (FEC), ensure that critical signals can still accurately reach their destination even in environments with poor signal quality.

[0059] As an optional embodiment, the secondary sensor 2 is an infrared pyroelectric sensor, used to detect in real time whether there are foreign objects within the range of motion of the movable parts of the electric furniture 201 without contact.

[0060] Optionally, both the main sensor 1 and the secondary sensor 2 can be non-contact infrared pyroelectric sensors, which offer higher sensitivity, greater safety, and lower cost. The working principle of infrared pyroelectric sensors is based on passive infrared detection. They can sense changes in infrared radiation, especially those caused by humans or other warm-blooded animals. When a foreign object enters its detection range, the sensor's temperature-sensing element detects a sudden increase or change in infrared radiation, thereby triggering the sensor's output signal.

[0061] Using infrared pyroelectric sensors for non-contact detection offers several advantages. First, non-contact detection avoids the potential safety hazards of traditional contact-based anti-pinch mechanisms, such as the risk of injury if the pressure bar anti-pinch mechanism is triggered. Second, infrared pyroelectric sensors have a wider detection range than contact sensors, covering any position within the movement range of movable parts without actual contact, improving detection sensitivity and response speed. Furthermore, because of the wide detection angle of infrared pyroelectric sensors, to prevent false detection triggering of anti-pinch mechanisms outside the scope of the motorized furniture, the inspection angle can be limited according to the required detection range, and the position can be adjusted to ensure the inspection area is within the frame. Finally, non-contact detection reduces sensor wear and damage, extends sensor lifespan, and lowers system maintenance costs.

[0062] The infrared pyroelectric sensor is not only used for foreign object detection, but also integrates a self-test function. Each sub-sensor 2 can automatically detect its own functional status and the integrity of the communication link when the system starts up or during periodic self-tests. This self-test mechanism ensures the normal operation of the sensors, and even in the event of a fault or abnormality, the system can promptly identify and take measures, such as reporting fault information to the controller 101, to avoid safety hazards caused by sensor failure.

[0063] As an optional embodiment, the main sensor 1 and the auxiliary sensor 2 are installed in the electric furniture 201 in at least one of the following ways: adsorption type, hook type, and fixed type. The adsorption type is used to adsorb the main sensor 1 and the auxiliary sensor 2 onto the frame of the electric furniture 201 when the frame of the electric furniture 201 is made of metal or magnetic material. The hook type is used to suspend the main sensor 1 and the auxiliary sensor 2 onto the frame of the electric furniture 201. The fixed type is used to directly fix the main sensor 1 and the auxiliary sensor 2 onto the frame of the electric furniture 201.

[0064] Optionally, the main sensor 1 and the auxiliary sensor 2 can be installed in at least one of the following methods: adsorption, hook, and fixed, to adapt to various frame materials and structures of the electric furniture 201, ensuring that the sensors can be stably and effectively installed in the optimal detection position to achieve foreign object detection and system self-testing within the range of motion of the movable parts.

[0065] The magnetic mounting method is particularly suitable for electric furniture 201 whose frame is made of metal or magnetic materials. In this case, the main sensor 1 and the auxiliary sensor 2 are equipped with magnetic bases that can be directly attached to the frame without additional fixing devices. Magnetic mounting not only provides ease of installation (no drilling or screws required), but also allows users to easily adjust the sensor position as needed to obtain the optimal detection angle and range. This mounting method is particularly suitable for scenarios requiring frequent sensor position adjustments or temporary installations, while the stable magnetic force of the base ensures the stability and accuracy of the sensor during operation.

[0066] The hook-type mounting method provides a flexible suspension solution for sensors, suitable for situations where the frame structure allows for hanging objects. By designing dedicated hooks, the main sensor 1 and the auxiliary sensor 2 can be easily suspended in appropriate positions on the frame. This method not only reduces physical damage to the frame but also allows for flexible adjustment of the sensor's installation height and angle according to the specific structure of the frame to optimize detection results.

[0067] Fixed installation is the most common method, where the main sensor 1 and the auxiliary sensor 2 are directly fixed to the frame of the electric furniture 201 using screws, adhesives, or other fasteners. Fixed installation provides the most stable physical connection, ensuring the stability of the sensors under long-term use and various operating conditions, and reducing detection errors caused by movement or vibration.

[0068] The choice of installation method depends on the frame material and structure of the electric furniture 201. For metal or magnetic frames, magnetic mounting is preferred because it is both simple and stable; hook mounting is suitable for scenarios where the frame structure allows for hanging, providing flexibility in height and angle; fixed mounting is suitable for all frame types, but the ease of installation and potential impact on the frame need to be considered. Regardless of the installation method, the installation positions of the main sensor 1 and the secondary sensor 2 must be carefully considered to ensure optimal detection coverage. The secondary sensor 2 should be installed near the range of motion of the movable parts of the electric furniture 201, especially the back and foot areas, to effectively detect any potential pinching risks. Meanwhile, the main sensor 1 should be installed in a location that facilitates receiving signals from all secondary sensors 2, ensuring unobstructed signal transmission.

[0069] This utility model embodiment also provides an anti-pinch device for electric furniture, including: a controller 101 and any of the above-mentioned foreign object detection systems for electric furniture 201, wherein the controller 101 is used to control the operation of the electric furniture based on the detection results of the main sensor 1 and the sub-sensor 2.

[0070] Optionally, Figure 8 This is a structural block diagram of an optional series-connected anti-pinch device for an electric bed, according to an embodiment of the present invention. Figure 8 As shown, the output of the main sensor 1 is connected to the interface of the controller 101. The controller 101 receives detection signals from the main sensor 1 and the auxiliary sensor 2, and makes corresponding judgments and control decisions based on these signals. The controller 101 embeds advanced signal processing algorithms and safety control logic, which can quickly analyze sensor signals, identify the presence of foreign objects, and control the operation of the electric bed accordingly. After receiving the signal from the main sensor 1, the controller 101 immediately executes the safety control logic. If the signal indicates the presence of a foreign object, the controller 101 will immediately send a stop command to the electric bed's motor drive system to prevent the bed board from continuing to move and causing injury. At the same time, the controller 101 can also handle fault signals during system self-testing. For example, if the main sensor 1 or any auxiliary sensor 2 reports a fault, the controller 101 will stop the operation of the electric bed until the system fault is eliminated, ensuring the overall safety and reliability of the system.

[0071] This utility model embodiment also provides an electric bed, including: a bed board, a bed frame, a motor, a controller 101, and any one of the above-mentioned foreign object detection systems for electric furniture 201.

[0072] Optionally, the bed board and bed frame serve as the structural support for the electric bed, providing not only a stable base for the bed board but also supporting key components such as the motor, controller 101, and foreign object detection system. The motor is the power source for the electric bed, responsible for driving the adjustment of the bed board. The electric bed may be equipped with one or more motors, each independently controlling a specific part of the bed board, such as the backrest or footrest. Responding to commands from the controller 101, the motor can precisely adjust the angle of the bed board, providing a comfortable user experience. From a safety perspective, the motor must be able to quickly respond to safety commands from the foreign object detection system, immediately stopping the movement of the bed board to prevent pinching or damage. The controller 101 is responsible for receiving and processing signals from the system, coordinating the work of the motor and other components, and monitoring the situation within the bed board's range of motion in real time. Once a foreign object is detected, the controller 101 immediately sends a stop signal to the motor. Simultaneously, it is also responsible for monitoring the operating status of the detection system to ensure the stability and safety of the system. By integrating a foreign object detection system, the electric bed provided in this embodiment can effectively prevent pinching accidents during dynamic adjustment of the bed board, especially for the safety of children and pets, improving the safety of the electric bed.

[0073] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0074] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0075] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0076] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0077] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0078] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A foreign object detection system for electric furniture, used to send a detection signal to a controller (101), characterized in that, include: Main sensor (1), secondary sensor (2), wherein, The input terminal of the main sensor (1) is connected to the output terminal of the secondary sensor (2), and the output terminal of the main sensor (1) is connected to the controller (101); The main sensor (1) and the secondary sensor (2) are mounted on the electric furniture (201), wherein the main sensor (1) and the secondary sensor (2) are used to detect whether there are foreign objects within the range of motion of the movable parts of the electric furniture (201).

2. The system according to claim 1, characterized in that, The main sensor (1) and the secondary sensor (2) are also used to perform self-testing of the foreign object detection system, including: The secondary sensor (2) performs a self-test and transmits the first self-test success signal to the main sensor (1) through the output terminal of the secondary sensor (2); The main sensor (1) receives the first self-test success signal and performs a self-test, and transmits the second self-test success signal to the controller (101) through the output terminal of the main sensor (1); The controller (101) receives the second self-test success signal and enables the foreign object detection function of the foreign object detection system.

3. The system according to claim 1, characterized in that, It also includes multiple sub-sensors (2), among which, The multiple sub-sensors (2) are connected in series; The plurality of sub-sensors (2) includes at least one sub-sensor (2) whose input terminal is not connected to other sub-sensors (2) and one sub-sensor (2) whose output terminal is not connected to other sub-sensors (2); The output terminal of the sub-sensor (2) whose output terminal is not connected to other sub-sensors (2) is connected to the input terminal of the main sensor (1); The input terminal of the sub-sensor (2) that is not connected to other sub-sensors (2) performs a self-test and transmits the corresponding self-test success signal to the next sub-sensor (2) through the output terminal; Each sub-sensor (2) performs a self-test after receiving the self-test success signal corresponding to the previous sub-sensor (2), and outputs its own corresponding self-test success signal; The sub-sensor (2) whose output terminal is not connected to other sub-sensors (2) transmits the corresponding self-test success signal to the main sensor (1) through the output terminal.

4. The system according to claim 1, characterized in that, When the main sensor (1) and / or the secondary sensor (2) detect a foreign object, they output a foreign object signal, including: When the input terminals of the main sensor (1) and / or the auxiliary sensor (2) receive a foreign object signal, the foreign object signal is output from the output terminal. When the controller (101) receives the foreign object signal output by the main sensor (1), it issues a stop command to the motor controlling the movable part.

5. The system according to claim 1, characterized in that, The main sensor (1) and the auxiliary sensor (2) also include a feedback device. After the main sensor (1) and the auxiliary sensor (2) perform self-tests, they output a self-test success signal and simultaneously control the feedback device to start. The feedback device is used to reflect the working status of the corresponding sensor.

6. The system according to claim 1, characterized in that, It also includes multiple sub-sensors (2), among which, The number of the plurality of sub-sensors (2) is determined based on the size of the electric furniture (201); The plurality of sub-sensors (2) are installed on the back and feet of the electric furniture (201), wherein the detection range of the plurality of sub-sensors (2) and the main sensor (1) covers the range of motion of the movable parts of the electric furniture (201).

7. The system according to claim 1, characterized in that, Both the main sensor (1) and the auxiliary sensor (2) are infrared pyroelectric sensors, used to detect in real time whether there are foreign objects within the range of motion of the movable parts of the electric furniture (201) without contact.

8. The system according to claim 1, characterized in that, The main sensor (1) and the auxiliary sensor (2) are installed in the electric furniture (201) in at least one of the following ways: suction type, hook type, and fixed type. The adsorption type is used to adsorb the main sensor (1) and the auxiliary sensor (2) onto the frame of the electric furniture (201) when the frame of the electric furniture (201) is made of metal or magnetic material; the hook type is used to suspend the main sensor (1) and the auxiliary sensor (2) onto the frame of the electric furniture (201); and the fixing type is used to directly fix the main sensor (1) and the auxiliary sensor (2) onto the frame of the electric furniture (201).

9. An anti-pinch device for electric furniture, characterized in that, Includes a controller (101) and a foreign object detection system for electric furniture (201) according to any one of claims 1 to 8, wherein, The controller (101) is used to control the operation of the electric furniture (201) based on the detection results of the main sensor (1) and the sub-sensor (2).

10. An electric bed, characterized in that, Includes a bed board, bed frame, motor, controller (101), and a foreign object detection system for electric furniture according to any one of claims 1 to 8.

Images