Anti-collision and anti-pressure mechanism and anti-collision and anti-pressure control method of dental chair

Abstract

The invention discloses an anti-collision and anti-pressing mechanism of a dental chair, and relates to the technical field of dental chairs, the anti-collision and anti-pressing mechanism comprises a first anti-collision shell, a second anti-collision shell and a limit switch which are arranged on a dental chair base; the first anti-collision shell is hung below the base in a swinging manner and is obliquely arranged downwards, the second anti-collision shell is mounted on a rotating shaft, connected with a backrest of the dental chair, of the base in a following rotation manner, the limiting switches are arranged on two sides of the base and are surrounded by the first anti-collision shell, and the touch control arm is triggered by upward swinging of the first anti-collision shell; when the first anti-collision shell is jacked up by an obstacle below the base or driven by the second anti-collision shell to swing upwards to reach the limiting amplitude, the limiting switch sends an in-place signal to a controller of the dental chair, so that the posture adjusting action is stopped, and the function of automatically preventing a presser foot or colliding with an object behind is achieved in the posture adjusting process of the dental chair; through multi-directional cooperative protection and mechanical-electric control linkage design, active collision prevention and pressure prevention of the dental chair during posture adjustment are realized, and the safety of doctors and patients and the operation convenience are improved.

Description

Technical Field

[0001] This invention relates to the field of dental chair technology, and in particular to a collision and pressure protection mechanism and a collision and pressure protection control method for a dental chair. Background Technology

[0002] The dental chair is a crucial piece of equipment in the dental treatment process. Its seat, backrest, footrest, tray, and auxiliary devices need to be adjusted at multiple angles and heights during treatment to accommodate different operating postures of the dentist. However, existing dental chairs often pose safety hazards during adjustment. When the seat height is lowered, components such as the support frame under the seat, the front edge of the seat cushion, or the footrest can easily press on the feet of the person performing the treatment. When the backrest is lowered or tilted back, the back of the backrest may also collide with the wall, instruments, or other objects behind the dental chair, causing accidental pressure or collision. This not only affects the operation during the procedure and the dentist's work efficiency but may also lead to patient discomfort and equipment damage.

[0003] In existing technologies, some dental chairs incorporate limit switches, travel control, or soft-stop programs in their electric control systems to decelerate or stop at extreme positions. However, these are mostly single-function travel limit protections and cannot detect changes in the surrounding environment in real time. Some chairs use fixed covers, soft surrounds, or mechanical cushioning structures at the bottom, which reduce impacts from sharp edges to some extent, but cannot fundamentally solve the problem of preventing pressure and collisions when the chair lowers or the backrest swings. Some high-end dental chairs incorporate pressure sensors or infrared detection elements, but these are mostly focused on the patient's safety direction, lacking comprehensive monitoring and active protection for the area around the healthcare worker's feet and behind the backrest. Therefore, if no one observes in time or presses the stop button or releases the adjustment button during the dental chair's posture adjustment, accidental pressure or collisions may still occur.

[0004] In addition, the posture adjustment of dental chairs often involves multi-degree-of-freedom motors, hydraulic cylinders or pneumatic actuators, which have large movement speed and inertia. Especially when the backrest and seat are adjusted in conjunction, the instantaneous movement range is large. If there is a lack of multi-level buffering or intelligent detection and control, the structural components may come into contact with foreign objects quickly, forming a large impact force, which not only damages the equipment, but also increases the risk of injury to patients and medical staff.

[0005] Because existing protective measures are mainly passive buffering and lack active prediction and multi-zone coordinated control, dental chairs still have insufficient impact and pressure resistance in complex environments.

[0006] In summary, the existing technology has at least the following technical problems:

[0007] Existing dental chairs are prone to bumping and collisions when adjusting posture, and lack technical problems such as active prediction and multi-zone coordinated control to prevent pressure and collisions. Summary of the Invention

[0008] The purpose of this invention is to provide an anti-collision and anti-pressure mechanism and an anti-collision and anti-pressure control method for a dental chair, so as to solve the technical problems of existing dental chairs being prone to collisions and pressures when adjusting posture, and lacking an anti-pressure and anti-collision mechanism with active prediction and multi-zone collaborative control.

[0009] The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0011] This invention provides an anti-collision and anti-pressure mechanism for a dental chair, comprising a first anti-collision shell, a second anti-collision shell, and a limit switch disposed on the base of the dental chair; the first anti-collision shell is swayably attached to the lower part of the base and is arranged obliquely downward from the back end of the base to the leg end; the second anti-collision shell is mounted on a pivot connecting the base to the backrest of the dental chair in a rotatable manner; the limit switch is disposed on both sides of the base and surrounded by the first anti-collision shell, and the touch arm of the limit switch is triggered by the upward swing of the first anti-collision shell; when the first anti-collision shell is subjected to pressure, the limit switch is triggered by the upward swing of the first anti-collision shell. When an obstacle under the base is lifted, the first anti-collision shell swings upward and reaches the amplitude that triggers the limit switch. The limit switch sends an engagement signal to the controller of the dental chair, causing the seat posture adjustment of the dental chair to stop. When the second anti-collision shell rotates with the backrest pivot and gradually presses down against the back end of the first anti-collision shell, the first anti-collision shell swings towards the base. The second anti-collision shell drives the first anti-collision shell to swing upward and reach the amplitude that triggers the limit switch. The limit switch sends an engagement signal to the controller of the dental chair, causing the backrest posture adjustment of the dental chair to stop.

[0012] In one embodiment, the lower part of the back end of the first anti-collision shell extends outward and the upper part tapers inward to form a touch support that tilts downward and cooperates with the second anti-collision shell; the lower part of the leg end of the first anti-collision shell is provided with a downwardly protruding leg pressing touch platform.

[0013] In one embodiment, two mounting posts are provided on each of the two side walls along the length of the base, with the two mounting posts respectively adjacent to the back end and the leg end of the base; mounting ears are provided on both sides inside the first anti-collision shell, and the mounting ears are provided with vertically arranged mounting slots; the first anti-collision shell is attached to the mounting posts of the base through the mounting slots; when the first anti-collision shell is triggered to swing upward, the mounting slots of the mounting ears adjacent to the back end of the base rotate around the mounting posts, causing the back end of the first anti-collision shell to rotate, while the mounting slots of the mounting ears adjacent to the leg end of the base cooperate with the current mounting post to guide the movement of the leg end of the first anti-collision shell.

[0014] In one embodiment, the mounting ear adjacent to the back end of the base is provided with a touch step; when the first anti-collision shell is triggered to swing upward, the mounting groove of the mounting ear adjacent to the back end of the base rotates around the mounting post, and the touch step gradually rises and depresses the touch arm of the limit switch.

[0015] In one embodiment, the second anti-collision shell has a contact profile that interferes with the contact platform of the first anti-collision shell; the contact profile gradually increases in a counterclockwise direction, and the straight-line distance from the rotation center of the second anti-collision shell to the contact profile gradually increases.

[0016] In one embodiment, a distance sensor is also included; the distance sensor is mounted under the base, and the detection end of the distance sensor faces the first anti-collision shell, for detecting the distance between the first anti-collision shell and the bottom surface of the base, and sending the distance information to the controller of the dental chair.

[0017] In one embodiment, a pre-set warning distance range between the first anti-collision shell and the bottom surface of the base is included in the controller of the dental chair. The distance sensor detects the distance information between the first anti-collision shell and the bottom surface of the base. After the controller of the dental chair determines that the currently measured distance information has entered the warning distance range, the controller of the dental chair issues a posture adjustment collision warning on the control screen and reduces the adjustment speed of the corresponding seat posture or backrest posture of the dental chair until the first anti-collision shell moves upward to trigger the limit switch, causing the seat posture or backrest posture adjustment of the dental chair to stop.

[0018] A method for anti-collision and anti-pressure control of a dental chair is also provided, including the following control steps: S1, initialization and status monitoring: After power-on, the controller of the dental chair reads the status of the limit switches corresponding to the first anti-collision shell and the second anti-collision shell, and receives the distance information from the distance sensor under the base in real time. In conjunction with the input status of the corresponding part of the posture adjustment mechanism, the controller establishes and stores the initial status and warning distance value range of the seat cushion and backrest.

[0019] S2. Warning distance judgment: When the seat or backrest posture of the dental chair is adjusted, the controller judges in real time whether the distance between the first anti-collision shell and the bottom surface of the base enters the warning distance value range; if it enters the warning range, the controller displays a collision warning on the control screen and automatically reduces the movement speed of the corresponding adjustment action to a preset slow speed.

[0020] S3, Linkage Trigger and Emergency Stop: When the first or second anti-collision shell is continuously raised due to external obstacles or backrest swing and triggers the limit switch, the controller immediately stops the current seat or backrest posture adjustment action of the dental chair and locks the posture to maintain a safe state.

[0021] S4. Multi-point redundancy judgment and dynamic compensation: The controller performs dual verification by combining the limit switch signal and the distance sensor signal. When the distance sensor signal and the limit switch signal are inconsistent, the controller executes the emergency stop command of the limit switch according to the priority and records the abnormal status for subsequent calibration.

[0022] S5. Intelligent Recovery and Readjustment: After an emergency stop, the controller determines whether to restore the safe distance based on the distance sensor detection results. If the distance between the first anti-collision shell and the bottom surface of the base reaches the safe distance, it will automatically unlock and allow the attitude adjustment action to be re-executed, or prompt the operator to restart the adjustment command.

[0023] In one embodiment, in the warning distance judgment step of S2, the controller dynamically adjusts the warning distance value range based on the real-time distance information between the first anti-collision shell and the bottom surface of the base; wherein, the dynamic adjustment includes: when the adjustment speed of the dental chair's seat posture or backrest posture is higher than a preset threshold, the warning distance value range automatically increases to trigger deceleration and warning in advance; when the adjustment speed is lower than the preset threshold, the warning distance value range automatically decreases to avoid false triggering.

[0024] In one embodiment, during the intelligent recovery and readjustment step S5, after the controller detects that the distance between the first anti-collision shell and the bottom surface of the base has reached a safe distance, it first drives the dental chair back to the preset safe posture range in a low-speed fine-tuning manner, and after completing the back-off, it releases the posture adjustment lock, allowing the operator to input new adjustment commands; if the limit switch is triggered again during the low-speed fine-tuning back-off process, the controller enters the secondary locking mode and prompts for manual inspection on the control screen.

[0025] In view of the shortcomings of existing dental chairs that are prone to bumping and collision when adjusting posture and lack active prediction and multi-zone collaborative control, the present invention proposes a collision and pressure prevention mechanism for dental chairs, which has the following beneficial effects: (1) Multi-directional three-dimensional protection: By setting a swingable first anti-collision shell under the base and a second anti-collision shell that rotates with the backrest, a two-way protection is formed for the space under and behind the dental chair, effectively preventing the operator's feet from being pressed or collisions with objects behind when the seat is lowered or the backrest is swayed.

[0026] (2) Mechanical triggering + electronic control linkage: When the first anti-collision shell encounters an obstacle, it swings up to trigger the limit switch. During the rotation of the backrest, the second anti-collision shell gradually drives the first anti-collision shell to trigger the limit switch. The limit switch signal is directly fed back to the controller of the dental chair to realize the automatic stop of the seat or backrest posture adjustment action, eliminating the need for manual observation and emergency operation, and improving safety and response speed.

[0027] (3) Swingable structure improves sensitivity: The first anti-collision shell adopts an inclined hanging and swingable design, which can quickly respond to the lifting force of external obstacles at the back end and leg end of the base, so that the limit switch is triggered within the shortest displacement, thereby improving the sensitivity and reliability of the protection system.

[0028] (4) Multi-zone coordinated control: The cooperation between the second anti-collision shell and the first anti-collision shell enables the early perception and triggering of the backrest movement trend, so that the anti-collision and anti-pressure function is not limited to the bottom of the dental chair, but also extends to the backrest area, forming all-round active protection.

[0029] (5) Reduce medical staff burden and risks: The dental chair can automatically stop adjusting its posture when it detects an obstacle, eliminating the need for operators to monitor it at all times. This reduces the risk of collisions caused by misoperation and delayed response, improves the safety of doctors and patients, enhances treatment efficiency, and improves the comfort of patients adjusting their sitting or lying posture during treatment.

[0030] (6) The anti-collision and anti-pressure mechanism has a simple structure and is easy to modify: The anti-collision and anti-pressure mechanism is a clever combination of conventional components such as anti-collision shell and limit switch. It has the characteristics of simple structure, low cost and strong applicability, and can be modified or integrated into existing dental chairs. Attached Figure Description

[0031] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is an isometric structural diagram of the anti-collision and anti-pressure mechanism of the present invention;

[0033] Figure 2 This is the present invention. Figure 1 A magnified schematic diagram of part A in the middle section;

[0034] Figure 3 This is a side view of the anti-collision and anti-pressure mechanism of the present invention;

[0035] Figure 4 This is a schematic diagram of the linkage structure of the first anti-collision shell and the second anti-collision shell of the anti-collision and anti-pressure mechanism of the present invention;

[0036] Figure 5 This is a cross-sectional view of the anti-collision and anti-pressure mechanism of the present invention, which is equipped with a distance sensor.

[0037] The reference numerals in the attached figures are as follows:

[0038] 1. Base; 11. Mounting column;

[0039] 2. First anti-collision shell; 21. Touch support platform; 22. Leg pressing touch platform; 23. Mounting ear; 231. Mounting slot; 232. Touch step;

[0040] 3. Second anti-collision shell; 31. Touch outline;

[0041] 4. Limit switch; 41. Touch arm;

[0042] 5. Distance sensor;

[0043] 6. Backrest. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0045] The specific implementation provides an anti-collision and anti-pressure mechanism and control method for a dental chair, including a first anti-collision shell, a second anti-collision shell, and a limit switch mounted on the base of the dental chair. The first anti-collision shell is hung below the base in a swingable manner and is arranged at an angle downwards. The second anti-collision shell is mounted on the pivot connecting the base to the backrest of the dental chair in a rotating manner. The limit switch is located on both sides of the base and surrounded by the first anti-collision shell. The touch arm is triggered by the upward swing of the first anti-collision shell. When the first anti-collision shell is lifted by an obstacle under the base or driven upward by the second anti-collision shell to reach the limit range, the limit switch sends a position signal to the controller of the dental chair, stopping the posture adjustment action. This achieves the function of automatically preventing foot pressure or collision with objects behind during the posture adjustment of the dental chair. Through multi-directional collaborative protection and mechanical-electrical control linkage design, the dental chair achieves active anti-collision and anti-pressure during posture adjustment, improving the safety of doctors and patients and the convenience of operation. It effectively solves the technical problems of existing dental chairs that are prone to collisions and pressure during posture adjustment and lack an active prediction and multi-zone collaborative control anti-pressure and anti-collision mechanism.

[0046] The first implementation of the anti-collision and anti-crush mechanism, for example Figures 1 to 4As shown, the dental chair includes a first anti-collision shell 2, a second anti-collision shell 3, and a limit switch 4 mounted on the base 1 of the dental chair. The first anti-collision shell 2 is hung on the bottom of the base 1 in a swingable manner and is arranged at an angle downward from the back end to the leg end of the base 1 of the dental chair. The second anti-collision shell 3 is mounted on the pivot of the base 1 connected to the backrest 6 of the dental chair in a rotating manner. The limit switch 4 is located on both sides of the base 1 and is surrounded by the first anti-collision shell 2. The touch arm 41 of the limit switch 4 is triggered by the upward swing of the first anti-collision shell 2.

[0047] Specifically, when the first anti-collision shell 2 is lifted by the obstacle under the base 1, the first anti-collision shell 2 swings upward and reaches the amplitude that triggers the limit switch 4. The limit switch 4 sends an in place signal to the controller of the dental chair, causing the seat posture adjustment action of the dental chair to stop.

[0048] When the second anti-collision shell 3 rotates along the pivot of the backrest 6 and gradually presses down against the back end of the first anti-collision shell 2, the first anti-collision shell 2 swings upward toward the base 1. The second anti-collision shell 3 drives the first anti-collision shell 2 to swing upward and reach the amplitude that triggers the limit switch 4. The limit switch 4 sends an in place signal to the controller of the dental chair, so that the posture adjustment action of the backrest 6 of the dental chair stops.

[0049] To address the shortcomings of existing dental chairs, such as the tendency for bumps and collisions during posture adjustments and the lack of proactive prediction and multi-zone coordinated control, a collision and pressure prevention mechanism for dental chairs is proposed, offering several technical advantages:

[0050] Multi-directional three-dimensional protection: By setting a swingable first anti-collision shell 2 under the base 1 and a second anti-collision shell 3 that rotates with the backrest 6, two-way protection is formed for the space under and behind the dental chair, effectively preventing the operator's feet from being pressed or collisions with objects behind when the seat lowers or the backrest 6 swings.

[0051] Mechanical triggering + electronic control linkage: When the first anti-collision shell 2 encounters an obstacle, it swings upward to trigger the limit switch 4. During the rotation of the backrest 6, the second anti-collision shell 3 gradually drives the first anti-collision shell 2 to trigger the limit switch 4. The signal from the limit switch 4 is directly fed back to the controller of the dental chair, realizing the automatic stopping of the posture adjustment of the seat cushion or backrest 6, eliminating the need for manual observation and emergency operation, and improving safety and response speed.

[0052] The swingable structure improves sensitivity: The first anti-collision shell 2 adopts an inclined hanging and swingable design, which can quickly respond to the lifting force of external obstacles at the back end and leg end of the base 1, so that the limit switch 4 is triggered within the shortest displacement, thereby improving the sensitivity and reliability of the protection system.

[0053] Multi-zone coordinated control: The cooperation between the second anti-collision shell 3 and the first anti-collision shell 2 enables the early detection and triggering of the movement trend of the backrest 6, so that the anti-collision and anti-pressure function is not limited to the bottom of the dental chair, but also extends to the backrest 6 area, forming all-round active protection.

[0054] Reduce the burden and risks on medical staff: Dental chairs can automatically stop adjusting their posture when they detect obstacles, eliminating the need for constant monitoring by operators. This reduces the risk of collisions caused by misoperation and delayed response, improves the safety of medical staff and patients, enhances treatment efficiency, and improves the comfort of patients adjusting their sitting or lying posture during treatment.

[0055] The anti-collision and anti-pressure mechanism has a simple structure and is easy to modify: The anti-collision and anti-pressure mechanism is a clever combination of conventional components such as anti-collision shell and limit switch 4. It has the characteristics of simple structure, low cost and strong applicability, and can be modified or integrated into existing dental chairs.

[0056] As one alternative implementation method:

[0057] Regarding the anti-collision structure of the first anti-collision shell 2 mentioned above, this embodiment is as follows: Figures 1 to 4 As shown, the lower part of the back end of the first anti-collision shell 2 extends outward and the upper part contracts inward, forming a touch support platform 21 that tilts downward and cooperates with the second anti-collision shell 3; the lower part of the leg end of the first anti-collision shell 2 is provided with a downward protruding leg pressing touch platform 22.

[0058] Among them, the part extending outward from the lower back end of the first anti-collision shell 2 can sense obstacles behind the backrest 6 when adjusting the posture, and make the first anti-collision shell 2 directly form a passive anti-collision mechanism with the limit switch 4; in conjunction with the second anti-collision shell 3, the first anti-collision shell 2 drives the limit switch 4 to trigger the active anti-collision mechanism; thus realizing a dual posture adjustment warning with dual anti-collision mechanisms behind the backrest 6.

[0059] During application, when the dental chair is being adjusted, the extended portion of the lower back of the first anti-collision shell 2 and the upper inward portion together form a downwardly inclined contact platform 21. When the backrest 6 swings backward or there is an obstacle behind the chair, the extended portion can contact the obstacle first and lift the first anti-collision shell 2, causing the first anti-collision shell 2 to swing upward and trigger the limit switch 4. At the same time, when the second anti-collision shell 3 rotates with the backrest 6 and continuously presses down on the contact platform 21 at the back of the first anti-collision shell 2, the first anti-collision shell 2 can also swing upward and trigger the limit switch 4, thus achieving active anti-collision.

[0060] This structure provides dual early warning and protection through a combination of passive and active anti-collision measures. It prevents backrest movement from being crushed or the chair back from hitting objects behind, thus improving the safety of posture adjustment.

[0061] In addition, the surfaces of the touch platform 21 and the leg-pressing touch platform 22 are covered with flexible materials, including rubber coating, silicone pads, or elastic polyurethane, to provide cushioning and anti-slip functions when sensing obstacles. Miniature pressure sensors can also be added to the outside of the touch platform 21 and the leg-pressing touch platform 22 to collect collision pressure information in real time and feed it back to the controller, so as to further improve the intelligence of the protection.

[0062] Regarding the aforementioned structure of the first anti-collision shell 2 being mounted on the base 1 and the structure of the base 1 cooperating with the first anti-collision shell 2, this embodiment is as follows: Figure 1 and Figure 2 As shown, two mounting posts 11 are provided on both sides of the base 1 along its length, with the two mounting posts 11 adjacent to the back end and the leg end of the base 1, respectively. Mounting ears 23 are provided on both sides inside the first anti-collision shell 2, and vertically arranged mounting slots 231 are provided on the mounting ears 23. The first anti-collision shell 2 is attached to the mounting posts 11 of the base 1 through the mounting slots 231. When the first anti-collision shell 2 is triggered to swing upward, the mounting slots 231 of the mounting ears 23 adjacent to the back end of the base 1 rotate around the mounting posts 11, causing the back end of the first anti-collision shell 2 to rotate. At the same time, the mounting slots 231 of the mounting ears 23 adjacent to the leg end of the base 1 cooperate with the current mounting post 11 to guide the movement of the leg end of the first anti-collision shell 2.

[0063] The vertical length of the mounting ear 23 at the leg end adjacent to the base 1 is greater than the vertical length of the mounting ear 23 at the back end adjacent to the base 1.

[0064] When applying the product, during the installation and debugging of the dental chair, the operator attaches the mounting slots 231 of the mounting ears 23 on both sides of the first anti-collision shell 2 to the mounting posts 11 on both sides of the base 1, so that the first anti-collision shell 2 is suspended below the base 1 and maintains an inclined posture.

[0065] When the dental chair is adjusted, the mounting ears 23 and mounting slots 231 near the back of the base 1 rotate around the mounting post 11, driving the back of the first anti-collision shell 2 to rise; at the same time, the mounting ears 23 and mounting slots 231 near the legs of the base 1 guide the legs of the first anti-collision shell 2 to move along the mounting post 11, forming a smooth swing trajectory; through this structural design of "back rotation + leg guidance", the first anti-collision shell 2 can quickly and stably swing to trigger the limit switch 4 when sensing an obstacle, achieving precise anti-collision and avoiding the first anti-collision shell 2 from accidentally triggering the limit switch 4.

[0066] Regarding the structure of the first anti-collision shell 2 triggering the limit switch 4, this embodiment is, for example... Figure 1 and Figure 2 As shown, the mounting ear 23 at the back end of the base 1 is provided with a touch step 232; when the first anti-collision shell 2 is triggered to swing upward, the mounting groove 231 of the mounting ear 23 at the back end of the base 1 rotates around the mounting post 11, and the touch step 232 gradually rises and the touch arm 41 of the low-voltage limit switch 4.

[0067] In application, when the dental chair adjusts the seat or backrest 6, if the first anti-collision shell 2 is pushed up by an obstacle or the back end is pressed down by the second anti-collision shell 3 and sways upward, the mounting ear 23 and mounting slot 231 of the adjacent base 1 back end rotate around the mounting post 11. This causes the touch step 232 to gradually rise and press against the touch arm 41 of the limit switch 4, activating the limit switch 4 within a preset travel range. The limit switch 4 immediately sends a signal to the controller, which then stops the current posture adjustment action to prevent further pressure or collision. This structure converts mechanical displacement into an electrical signal, resulting in fast response, high reliability, and safe stopping without additional drive components.

[0068] Through the spring of the touch arm 41 of the limit switch 4, the touch step 232 can achieve micro-motion buffering through contact action with the limit switch 4, reduce impact, and extend the life of the limit switch 4; or by adding photoelectric or Hall sensor to the limit switch 4, non-contact detection can be achieved, improving stability in dusty or humid environments.

[0069] Regarding the aforementioned mating structure between the second anti-collision shell 3 and the first anti-collision shell 2, this embodiment is, for example... Figure 4 As shown, the second anti-collision shell 3 is provided with a contact profile 31 that interferes with the contact support 21 of the first anti-collision shell 2; the contact profile 31 gradually increases in the counterclockwise direction, and the straight-line distance from the rotation center of the second anti-collision shell 3 to the contact profile 31 gradually increases.

[0070] During application, as the backrest 6 is adjusted backward, the second anti-collision shell 3 rotates with the pivot, gradually causing it to press down on the contact support 21 at the back end of the first anti-collision shell 2 due to the contact contour 31.

[0071] As the contact contour 31 gradually increases in the counterclockwise direction, that is, the distance from the rotation center to the contact contour 31 gradually increases, the downward pressure and displacement of the second anti-collision shell 3 on the first anti-collision shell 2 are progressively enhanced, thereby making the first anti-collision shell 2 smoothly and progressively move to trigger the limit switch 4, realizing the early perception and buffering trigger of the movement trend of the backrest 6; this progressive interference cooperation structure helps to avoid the instantaneous impact generated when the backrest 6 is adjusted, improves the controllability and comfort of triggering, and realizes more intelligent anti-collision and anti-pressure control.

[0072] The second implementation of the anti-collision and anti-crush mechanism is as follows: Figure 5 As shown, the difference between this embodiment and the first embodiment is that it also includes a distance sensor 5; the distance sensor 5 is installed under the base 1, and the detection end of the distance sensor 5 faces the first anti-collision shell 2, which is used to detect the distance between the first anti-collision shell 2 and the bottom surface of the base 1, and send the distance information to the controller of the dental chair.

[0073] Distance sensor 5 enables non-contact detection of the distance between the first anti-collision shell 2 and the bottom surface of the base 1.

[0074] Specifically, the controller of the dental chair presets a warning distance range between the bottom surface of the first anti-collision shell 2 and the base 1; the distance sensor 5 senses the distance information between the bottom surface of the first anti-collision shell 2 and the base 1; after the controller of the dental chair determines that the currently measured distance information has entered the warning distance range, the controller of the dental chair issues a posture adjustment collision warning on the control screen and reduces the adjustment speed of the corresponding seat posture or backrest posture 6 of the dental chair until the upper swing of the first anti-collision shell 2 triggers the limit switch 4 to stop the adjustment of the seat posture or backrest posture 6 of the dental chair.

[0075] During application, when the seat or backrest 6 posture is adjusted in the dental chair, the distance sensor 5 installed under the base 1 continuously faces the first anti-collision shell 2, collects the distance information between the first anti-collision shell 2 and the bottom surface of the base 1 in real time, and transmits it to the controller of the dental chair.

[0076] The controller has a preset warning distance range. When the distance information is detected to enter the warning range, the controller will immediately issue a collision warning on the control screen and automatically reduce the corresponding posture adjustment speed to a preset slow speed, so that the dental chair has an active safety function of "warning first and then decelerating". If the obstacle continues to exist and causes the first anti-collision shell 2 to be lifted up to trigger the limit switch 4, the controller will immediately stop the adjustment action and enter the safe stop state.

[0077] Through this dual-layer protection mechanism formed by the combination of "distance sensor 5 + limit switch 4", the dental chair can not only detect potential risks of pressure or collision in advance when adjusting its posture, but also dynamically reduce its movement speed and stop immediately when necessary. This significantly improves the safety of medical staff's feet and objects behind the chair, and reduces the risk of accidental injury and equipment damage.

[0078] Based on the above embodiments of the anti-collision and anti-pressure mechanism, an anti-collision and anti-pressure control method for a dental chair is provided, including the following control steps: S1, initialization and status monitoring: After power-on, the controller of the dental chair reads the limit switch status corresponding to the first anti-collision shell and the second anti-collision shell, and receives the distance information from the distance sensor under the base in real time. In conjunction with the input status of the corresponding part of the posture adjustment mechanism, the initial status and warning distance value range of the seat cushion and backrest are established and stored.

[0079] S2. Warning distance judgment: When the seat or backrest posture of the dental chair is adjusted, the controller judges in real time whether the distance between the first anti-collision shell and the bottom surface of the base enters the warning distance value range; if it enters the warning range, the controller displays a collision warning on the control screen and automatically reduces the movement speed of the corresponding adjustment action to a preset slow speed.

[0080] S3, Linkage Trigger and Emergency Stop: When the first or second anti-collision shell is continuously raised due to external obstacles or backrest swing and triggers the limit switch, the controller immediately stops the current seat or backrest posture adjustment action of the dental chair and locks the posture to maintain a safe state.

[0081] S4. Multi-point redundancy judgment and dynamic compensation: The controller performs dual verification by combining the limit switch signal and the distance sensor signal. When the distance sensor signal and the limit switch signal are inconsistent, the controller executes the emergency stop command of the limit switch according to the priority and records the abnormal status for subsequent calibration.

[0082] S5. Intelligent Recovery and Readjustment: After an emergency stop, the controller determines whether to restore the safe distance based on the distance sensor detection results. If the distance between the first anti-collision shell and the bottom surface of the base reaches the safe distance, it will automatically unlock and allow the attitude adjustment action to be re-executed, or prompt the operator to restart the adjustment command.

[0083] When applied, the above control steps, combined with the coordinated judgment of limit switches and distance sensors, enable the dental chair to automatically warn, actively decelerate, and quickly stop when necessary during posture adjustment, forming a multi-level active and passive anti-collision and anti-pressure protection, achieving comprehensive safety protection for medical staff, patients, and surrounding equipment.

[0084] In the warning distance judgment step of S2, the controller dynamically adjusts the warning distance value range based on the real-time distance information between the first anti-collision shell and the bottom surface of the base.

[0085] The dynamic adjustment includes: when the adjustment speed of the dental chair's seat or backrest posture exceeds a preset threshold, the warning distance range automatically increases to trigger deceleration and warning in advance; when the adjustment speed is below the preset threshold, the warning distance range automatically decreases to avoid false triggering.

[0086] When applied, the dynamic adjustment mechanism in the warning distance judgment step of S2 enables the warning threshold to be adaptively adjusted according to the movement speed of the dental chair's seat or backrest posture, thereby improving the sensitivity and accuracy of the protection response.

[0087] In the S5's intelligent recovery and readjustment process, after the controller detects that the distance between the first anti-collision shell and the bottom surface of the base has reached a safe distance, it first drives the dental chair back to the preset safe posture range in a low-speed fine-tuning mode. After the back-off is completed, the posture adjustment lock is released, allowing the operator to input new adjustment commands. If the limit switch is triggered again during the low-speed fine-tuning back-off process, the controller enters the secondary locking mode and prompts for manual inspection on the control screen.

[0088] When applied, the "automatic retraction + secondary locking" strategy is introduced in the intelligent recovery and readjustment steps of S5. This not only ensures the rapid recovery capability after the first anti-collision shell and limit switch are accidentally triggered, but also avoids secondary collisions in complex environments, thereby improving the overall robustness and safety of the dental chair's anti-collision and anti-pressure mechanism.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A dental chair anti-collision and anti-pressure mechanism, characterized in that, This includes installing a first anti-collision shell, a second anti-collision shell, and a limit switch on the base of the dental chair; The first impact shield is hung below the base in a swingable manner and is arranged at an angle downward from the back end of the base of the dental chair to the leg end. The second anti-collision shell is mounted on the pivot of the base connected to the back of the dental chair in a rotating manner; The limit switch is disposed on both sides of the base and surrounded by the first anti-collision shell. The touch arm of the limit switch is triggered by the upward swing of the first anti-collision shell. When the first anti-collision shell is lifted by the obstacle under the base, the first anti-collision shell swings upward and reaches the amplitude that triggers the limit switch. The limit switch sends an on signal to the controller of the dental chair, so that the seat posture adjustment action of the dental chair stops. When the second anti-collision shell rotates along with the backrest's pivot and gradually presses down against the back end of the first anti-collision shell, the first anti-collision shell swings towards the base. The second anti-collision shell drives the first anti-collision shell to swing upward and reach the amplitude that triggers the limit switch. The limit switch sends an in position signal to the dental chair's controller, causing the dental chair's backrest posture adjustment to stop.

2. The anti-collision and anti-pressure mechanism according to claim 1, characterized in that, The lower part of the back end of the first anti-collision shell extends outward and the upper part tapers inward, forming a contact support that tilts downward and cooperates with the second anti-collision shell; The lower part of the leg end of the first anti-collision shell is provided with a downward protruding leg pressing touch platform.

3. The anti-collision and anti-pressure mechanism according to claim 2, characterized in that, The base has two mounting posts on each of its two side walls along its length, and the two mounting posts are respectively adjacent to the back end and the leg end of the base. The first anti-collision shell has mounting ears on both sides, and the mounting ears have vertically arranged mounting slots. The first anti-collision shell is attached to the mounting post of the base via the mounting slot; When the first anti-collision shell triggers the upward swing, the mounting groove of the mounting ear near the back end of the base rotates around the mounting post, causing the back end of the first anti-collision shell to rotate. At the same time, the mounting groove of the mounting ear near the leg end of the base cooperates with the current mounting post to guide the leg end of the first anti-collision shell to move upward.

4. The anti-collision and anti-pressure mechanism according to claim 3, characterized in that, The mounting ear near the back end of the base is provided with a touch step; When the first anti-collision shell triggers the upward swing, the mounting slot of the mounting ear near the back end of the base rotates around the mounting post, and the touch step gradually rises and depresses the touch arm of the limit switch.

5. The anti-collision and anti-pressure mechanism according to claim 2, characterized in that, The second anti-collision shell has a contact profile that interferes with the contact support of the first anti-collision shell; The touch contour gradually increases in a counterclockwise direction, and the straight-line distance from the rotation center of the second anti-collision shell to the touch contour gradually increases.

6. The anti-collision and anti-pressure mechanism according to claim 1, characterized in that, It also includes a distance sensor; The distance sensor is installed under the base, with its detection end facing the first anti-collision shell. It is used to detect the distance between the first anti-collision shell and the bottom surface of the base, and send the distance information to the controller of the dental chair.

7. The anti-collision and anti-pressure mechanism according to claim 6, characterized in that, The controller of the dental chair is pre-set with a range of warning distance values ​​between the first anti-collision shell and the bottom surface of the base; The distance sensor detects the distance information between the first anti-collision shell and the bottom surface of the base. After the dental chair controller determines that the currently measured distance information has entered the warning distance value range, the dental chair controller issues a posture adjustment collision warning on the control screen and reduces the adjustment speed of the corresponding seat posture or backrest posture of the dental chair until the first anti-collision shell moves up and triggers the limit switch to stop the seat posture or backrest posture adjustment of the dental chair.

8. A method for preventing collisions and pressure on a dental chair, comprising the anti-collision and anti-pressure mechanism as described in claims 1 to 7, characterized in that, The control steps include the following: S1, Initialization and Status Monitoring: After power-on, the controller of the dental chair reads the status of the limit switches corresponding to the first and second anti-collision shells, and receives the distance information from the distance sensor under the base in real time. In conjunction with the input status of the corresponding parts of the posture adjustment mechanism, it establishes and stores the initial status and warning distance value range of the seat cushion and backrest. S2. Warning distance judgment: When the seat or backrest posture of the dental chair is adjusted, the controller judges in real time whether the distance between the first anti-collision shell and the bottom surface of the base enters the warning distance value range; if it enters the warning range, the controller displays a collision warning on the control screen and automatically reduces the movement speed of the corresponding adjustment action to a preset slow speed. S3, Linkage Trigger and Emergency Stop: When the first or second anti-collision shell is continuously raised due to external obstacles or backrest swing and triggers the limit switch, the controller immediately stops the current seat or backrest posture adjustment action of the dental chair and locks the posture to maintain a safe state. S4. Multi-point redundancy judgment and dynamic compensation: The controller performs dual verification by combining the limit switch signal and the distance sensor signal. When the distance sensor signal and the limit switch signal are inconsistent, the controller executes the emergency stop command of the limit switch according to the priority and records the abnormal status for subsequent calibration. S5. Intelligent Recovery and Readjustment: After an emergency stop, the controller determines whether to restore the safe distance based on the distance sensor detection results. If the distance between the first anti-collision shell and the bottom surface of the base reaches the safe distance, it will automatically unlock and allow the attitude adjustment action to be re-executed, or prompt the operator to restart the adjustment command.

9. The anti-collision and anti-pressure control method according to claim 8, characterized in that, In the warning distance judgment step of S2, the controller dynamically adjusts the warning distance value range based on the real-time distance information between the first anti-collision shell and the bottom surface of the base. The dynamic adjustment includes: when the adjustment speed of the dental chair's seat or backrest posture exceeds a preset threshold, the warning distance range automatically increases to trigger deceleration and warning in advance; when the adjustment speed is below the preset threshold, the warning distance range automatically decreases to avoid false triggering.

10. The anti-collision and anti-pressure control method according to claim 8, characterized in that, In the S5's intelligent recovery and readjustment process, after the controller detects that the distance between the first anti-collision shell and the bottom surface of the base has reached a safe distance, it first drives the dental chair back to the preset safe posture range in a low-speed fine-tuning manner, and after completing the back-off, it releases the posture adjustment lock, allowing the operator to input new adjustment commands. If the limit switch is triggered again during the low-speed fine-tuning retraction process, the controller will enter the secondary locking mode and prompt manual inspection on the control screen.

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