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

Abstract

The application discloses a kind of anti-collision and anti-pressure mechanisms of dental chair, it is related to the technical field of dental chair, including being arranged on the first anti-collision shell of dental chair pedestal, second anti-collision shell and limit switch;First anti-collision shell is hung in the mode of swing in below pedestal and is arranged obliquely downward, second anti-collision shell is installed on the pivot of the backrest of dental chair in the mode of following rotation in pedestal connection, limit switch is arranged in the both sides of pedestal and is surrounded by first anti-collision shell, and touch control arm is triggered by swinging on first anti-collision shell;When first anti-collision shell is lifted by obstacle under pedestal or is driven to swing to reach the limit range by second anti-collision shell, limit switch sends in-place signal to the controller of dental chair, makes posture adjustment action stop, to realize the function of automatically preventing foot pressure or colliding with rear object in the process of posture adjustment of dental chair;Through the collaborative protection of multiple directions and mechanical-electric control linkage design, active anti-collision and anti-pressure of dental chair are realized when posture is adjusted, and the safety and operation convenience of doctor and patient are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dental chairs, in particular to a collision and pressure prevention mechanism and a control method thereof. BACKGROUND

[0002] The dental chair is a key device in the dental treatment process, and its seat, backrest, foot pedal, tray and auxiliary devices need to be adjusted at multiple angles and heights during treatment to cooperate with the doctor to complete different operating postures. However, the existing dental chair often has safety hazards during adjustment; when the seat height is lowered, the supporting bracket, the front edge of the seat cushion or the foot pedal under the seat and other components are easy to press the feet of the person performing the treatment operation; when the backrest is lowered or swings backward, the back of the backrest plate may collide with the wall, instrument or other objects behind the dental chair, causing accidental pressure or collision; this not only affects the operation and the doctor's work efficiency during the operation, but also may cause patient discomfort, equipment damage and other problems.

[0003] In the prior art, some dental chairs have limit switches, travel controls or soft stop programs in the electric control system to slow down or stop at the limit position, but most of them are single travel limit protection and cannot sense the changes in the environment around the dental chair in real time; some have fixed protective covers, soft enclosures or mechanical buffer structures installed at the bottom, which can reduce the collision of sharp edges to some extent, but cannot fundamentally solve the problem of pressure and collision when the seat is lowered or the backrest swings; some high-end dental chairs have introduced pressure sensors or infrared detection elements, but most of them are focused on patient safety and lack comprehensive monitoring and active protection of the foot area of medical staff and the area behind the backrest. Therefore, if no one observes and presses the stop key or releases the adjustment key in time during the adjustment of the dental chair posture, accidental pressure or collision may still occur.

[0004] In addition, the adjustment of the dental chair posture often involves multiple degrees of freedom of motors, oil cylinders or pneumatic actuators, which have large movement speed and inertia, especially when the backrest and the seat are adjusted in linkage, the instantaneous movement amplitude is large, and if there is no multi-stage buffer or intelligent detection control, the structure will quickly contact external objects, 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 the existing protection means mainly rely on passive buffering, lack of active prediction and multi-zone collaborative control, the collision and pressure prevention performance of the dental chair in complex environments is still insufficient.

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

[0007] The existing dental chair is prone to collision and pressure when adjusting the posture, and lacks an active prediction and multi-zone collaborative control mechanism for pressure and collision prevention. SUMMARY

[0008] The present application aims to provide a collision and pressure prevention mechanism and control method of a dental chair to solve the technical problem that the existing dental chair is prone to collision and pressure when adjusting the posture and lacks a proactive prediction and multi-zone collaborative control mechanism.

[0009] The preferred technical solutions in the various technical solutions provided by the present application can produce the technical effects described below.

[0010] To solve the above technical problems, the present application provides the following technical solutions:

[0011] The present application provides a collision and pressure prevention mechanism of a dental chair, comprising a first collision prevention shell, a second collision prevention shell and a limit switch arranged on the base of the dental chair; the first collision prevention shell is hung below the base in a swingable manner and is arranged downwardly inclined from the back end to the leg end of the base; the second collision prevention shell is installed on the rotating shaft of the backrest of the dental chair in a following rotating manner; the limit switch is arranged on both sides of the base and surrounded by the first collision prevention shell, and the touch arm of the limit switch is swung upwardly by the first collision prevention shell to trigger; when the first collision prevention shell is lifted by the obstacle below the base, the first collision prevention shell swings upwardly to a range triggering the limit switch, and the limit switch sends a position signal to the controller of the dental chair to stop the action of adjusting the posture of the cushion of the dental chair; when the second collision prevention shell rotates with the rotating shaft of the backrest and gradually presses the back end of the first collision prevention shell downwardly, the first collision prevention shell swings upwardly toward the base, and the second collision prevention shell drives the first collision prevention shell to swing upwardly to the range triggering the limit switch, and the limit switch sends a position signal to the controller of the dental chair to stop the action of adjusting the posture of the backrest of the dental chair.

[0012] In one embodiment, the back end of the first collision prevention shell extends outwardly at the lower part and contracts inwardly at the upper part to form a touch bearing platform inclined downwardly and matched with the second collision prevention shell; and the leg end of the first collision prevention shell is provided with a downwardly protruding leg pressing touch platform.

[0013] In one embodiment, both sides of the base are provided with two mounting columns, and the two mounting columns are adjacent to the back end and the leg end of the base, respectively; the first collision prevention shell is provided with mounting ears on both sides, and the mounting ears are provided with vertically arranged mounting grooves; the first collision prevention shell is hung on the mounting columns of the base through the mounting grooves; when the first collision prevention shell is triggered to swing upwardly, the mounting groove of the mounting ear adjacent to the back end of the base rotates around the mounting column to rotate the back end of the first collision prevention shell, and the mounting groove of the mounting ear adjacent to the leg end of the base cooperates with the current mounting column to guide the leg end of the first collision prevention shell to move upwardly.

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

[0015] In one of the embodiments, the second anti-collision shell is provided with a touch contour interfering with the touch bearing platform of the first anti-collision shell; the touch contour gradually increases in the counterclockwise direction, and the straight-line distance from the rotation center of the second anti-collision shell to the touch contour gradually increases.

[0016] In one of the embodiments, a distance sensor is further included; the distance sensor is installed below the base, and the detection end of the distance sensor faces the first anti-collision shell, which 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.

[0017] In one of the embodiments, a preset warning distance numerical range between the first anti-collision shell and the bottom surface of the base is preset in the controller of the dental chair; the distance sensor senses the distance information between the first anti-collision shell and the bottom surface of the base, and after the controller of the dental chair determines that the currently measured distance information enters the warning distance numerical 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 triggers the limit switch to stop the adjustment of the seat posture or backrest posture of the dental chair.

[0018] A dental chair anti-collision and anti-pressure control method is also provided, which includes the following control steps: S1, initialization and state monitoring: the controller of the dental chair reads the state of the limit switch corresponding to the first anti-collision shell and the second anti-collision shell after power-on, and receives the distance information of the distance sensor below the base in real time, and establishes and stores the initial state of the seat and the backrest and the warning distance numerical range in combination with the input state of the corresponding part of the posture adjustment mechanism;

[0019] S2, warning distance judgment: when the adjustment action of the seat posture or backrest posture of the dental chair is performed, the controller judges whether the distance information between the first anti-collision shell and the bottom surface of the base enters the warning distance numerical range in real time; 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 anti-collision shell or the second anti-collision shell is caused by the external obstacle or the backrest swing, the first anti-collision shell continuously swings up and triggers the limit switch, the controller immediately stops the current adjustment action of the seat posture or the backrest posture of the dental chair, and locks the posture to maintain the safety state;

[0021] S4, multi-point redundancy judgment and dynamic compensation: the controller combines the limit switch signal and the distance sensor signal for double verification, when the distance sensor signal and the limit switch signal are inconsistent, the controller executes the emergency stop instruction of the limit switch according to the priority, and records the abnormal state for subsequent calibration;

[0022] S5, intelligent recovery and readjustment: after the emergency stop, the controller judges whether to restore the safety distance according to the detection result of the distance sensor, if the distance between the first anti-collision shell and the bottom surface of the base reaches the safety distance, the automatic unlocking is allowed to execute the posture adjustment action again, or the operator is prompted to restart the adjustment instruction.

[0023] In one embodiment, in the pre-warning distance judgment step S2, the controller dynamically adjusts the pre-warning distance value range according to 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 seat posture or the backrest posture of the dental chair is higher than the preset threshold, the pre-warning distance value range is automatically increased to trigger the speed reduction and pre-warning in advance; when the adjustment speed is lower than the preset threshold, the pre-warning distance value range is automatically reduced to avoid false triggering.

[0024] In one embodiment, in the intelligent recovery and readjustment step S5, after detecting that the distance between the first anti-collision shell and the bottom surface of the base reaches the safety distance, the controller first drives the dental chair to retreat to the preset safety posture interval in a low-speed fine-tuning manner, and then releases the posture adjustment lock after completing the retreat, allowing the operator to input a new adjustment instruction; if the limit switch is triggered again during the low-speed fine-tuning retreat, the controller enters the secondary lock mode and prompts manual inspection on the control screen.

[0025] The present application aims at the defects of the existing dental chair that is prone to collision and pressure during posture adjustment and lacks active prediction and multi-zone collaborative control, and proposes a technical solution of an anti-collision and anti-pressure mechanism for a dental chair, which has the following beneficial effects: (1) multi-directional three-dimensional protection: by setting a first anti-collision shell below the base and a second anti-collision shell rotating with the backrest, a two-way protection is formed for the space below and behind the dental chair, effectively avoiding the pressure on the operator's feet or collision with the rear object when the seat is lowered or the backrest is swung.

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

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

[0028] (4) Multi-zone collaborative control: The cooperation between the second anti-collision shell and the first anti-collision shell realizes the early perception and triggering of the backrest movement trend, making the anti-collision and anti-pressure function not only limited to the bottom of the dental chair, but also extended to the backrest area, forming a comprehensive active protection.

[0029] (5) Reducing the burden and risk of medical staff: The dental chair can automatically stop the posture adjustment when detecting obstacles, eliminating the need for operators to monitor at all times, reducing the risk of collision caused by misoperation and delayed response, and improving the safety of doctors and patients, treatment efficiency, and the comfort of adjusting the lying and sitting posture during treatment.

[0030] (6) Simple structure of anti-collision and anti-pressure mechanism for easy retrofitting: The anti-collision and anti-pressure mechanism is composed of anti-collision shells, limit switches and other conventional components, with the characteristics of simple structure, low cost and strong applicability, and can be retrofitted or integrated on existing dental chairs. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is the isometric structure diagram of the anti-collision and anti-pressure mechanism of the present application;

[0033] Figure 2 is the isometric structure diagram of the anti-collision and anti-pressure mechanism of the present application; Figure 1

[0034] Figure 3 is the side view structure diagram of the anti-collision and anti-pressure mechanism of the present application;

[0035] Figure 4 is the linkage structure diagram of the first anti-collision shell and the second anti-collision shell of the anti-collision and anti-pressure mechanism of the present application; ​

[0036] Figure 5 is a sectional view of the anti-collision and anti-pressure mechanism of the present application with a distance sensor installed.

[0037] In the drawings, the reference signs are as follows:

[0038] 1, base; 11, mounting column;

[0039] 2, first anti-collision shell; 21, touch bearing platform; 22, pressure leg touch platform; 23, mounting ear; 231, mounting slot; 232, touch step;

[0040] 3, second anti-collision shell; 31, touch contour;

[0041] 4, limit switch; 41, touch arm;

[0042] 5, distance sensor;

[0043] 6, backrest. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0045] The anti-collision and anti-pressure mechanism of a dental chair and an anti-collision and anti-pressure control method are provided in the detailed description, which include a first anti-collision shell, a second anti-collision shell and a limit switch arranged on a base of the dental chair; the first anti-collision shell is hung below the base in a swingable manner and is arranged obliquely downward, the second anti-collision shell is installed on a rotating shaft connecting a backrest of the dental chair in a following rotating manner, the limit switch is arranged on both sides of the base and surrounded by the first anti-collision shell, and a touch arm is triggered by swinging on the first anti-collision shell; when the first anti-collision shell is lifted by an obstacle below the base or is driven to swing up to a limit range by the second anti-collision shell, the limit switch sends a position signal to a controller of the dental chair, so that a posture adjustment action is stopped, thereby realizing the function of automatically preventing the feet from being pressed or the rear object from being collided during the posture adjustment of the dental chair; through the multi-directional cooperative protection and mechanical-electric control linkage design, the active anti-collision and anti-pressure of the dental chair during the posture adjustment is realized, the safety and the operation convenience of doctors and patients are improved, and the technical problem that the existing dental chair is prone to collision and pressure during the posture adjustment and lacks the active prediction and multi-zone cooperative control anti-pressure and anti-collision mechanism is effectively solved.

[0046] The first embodiment of the anti-collision and anti-pressure mechanism Figures 1 to 4As shown, including in the base of the dental chair 1 is provided with the first anti-collision shell 2, the second anti-collision shell 3 and the limit switch 4; the first anti-collision shell 2 is hung below the base 1 in a swingable manner, and is arranged downwardly from the back end to the leg end of the base 1 of the dental chair; the second anti-collision shell 3 is installed on the rotating shaft of the backrest 6 of the base 1 in a following rotating manner; the limit switch 4 is provided on both sides of the base 1 and surrounded by the first anti-collision shell 2, and the touch arm 41 of the limit switch 4 swings upwardly to trigger.

[0047] Specifically, when the first anti-collision shell 2 is lifted by the obstacle below the base 1, the first anti-collision shell 2 swings upwardly to a range of triggering the limit switch 4, and the limit switch 4 sends a position signal to the controller of the dental chair to stop the posture adjustment action of the seat cushion.

[0048] When the second anti-collision shell 3 rotates following the rotating shaft of the backrest 6 and gradually presses the back end of the first anti-collision shell 2 downwardly, the first anti-collision shell 2 swings upwardly to the base 1, and the second anti-collision shell 3 drives the first anti-collision shell 2 to swing upwardly to a range of triggering the limit switch 4, and the limit switch 4 sends a position signal to the controller of the dental chair to stop the posture adjustment action of the backrest 6.

[0049] In view of the defects that the existing dental chair is prone to collision and lacks active prediction and multi-zone collaborative control when adjusting the posture, the anti-collision and anti-pressure mechanism technical scheme of the dental chair is proposed, which has multiple technical advantages:

[0050] Multi-directional three-dimensional protection: by providing the swingable first anti-collision shell 2 below the base 1 and the second anti-collision shell 3 rotating following the backrest 6, two-way protection of the space below and behind the dental chair is formed, effectively avoiding the foot of the operator being pressed or the rear object being collided when the seat is lowered or the backrest 6 swings.

[0051] Mechanical triggering + electric control linkage: the first anti-collision shell 2 swings upwardly to trigger the limit switch 4 when encountering an obstacle, and the second anti-collision shell 3 gradually drives the first anti-collision shell 2 to trigger the limit switch 4 in the process of rotating the backrest 6, and the signal of the limit switch 4 is directly fed back to the controller of the dental chair, realizing automatic stop of the posture adjustment action of the seat cushion or the backrest 6, saving manual observation and emergency operation, and improving safety and reaction speed.

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

[0053] Multi-zone cooperative control: the cooperation between the second anti-collision shell 3 and the first anti-collision shell 2 realizes the early perception 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 is also extended to the backrest 6 area, forming a full-range active protection.

[0054] Reduce the burden and risk of medical staff: the dental chair can automatically stop posture adjustment when obstacles are detected, without the need for operators to monitor at all times, reducing the risk of collision caused by misoperation and delayed response, improving the safety of medical staff and patients, treatment efficiency, and the comfort of patients adjusting their lying or sitting posture during treatment.

[0055] The anti-collision and anti-pressure mechanism is simple in structure and easy to retrofit: the anti-collision and anti-pressure mechanism is composed of the anti-collision shell, the limit switch 4 and other conventional components, and has the characteristics of simple structure, low cost and strong applicability, and can be retrofitted or integrated on existing dental chairs.

[0056] As one of the optional embodiments:

[0057] Regarding the anti-collision structure of the first anti-collision shell 2, this embodiment is as shown in Figures 1 to 4 The lower part of the back end of the first anti-collision shell 2 extends outward, and the upper part shrinks inward, forming a tilted downward touch bearing platform 21 cooperating 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 of the lower part of the back end of the first anti-collision shell 2 extending outward can perceive obstacles behind the backrest 6 during posture adjustment, and directly form a passive anti-collision mechanism with the limit switch 4; cooperate with the second anti-collision shell 3 to drive the first anti-collision shell 2 to trigger the limit switch 4 to form an active anti-collision mechanism; realize double posture adjustment warning of the double anti-collision mechanism behind the backrest 6.

[0059] In application, during the posture adjustment of the dental chair, the outwardly extending part and the inwardly shrinking part of the lower part of the back end of the first anti-collision shell 2 together form a tilted downward touch bearing platform 21, which can first contact the obstacle and lift the first anti-collision shell 2 when the backrest 6 swings backward or there is an obstacle behind the chair, so that the first anti-collision shell 2 is triggered to lift the limit switch 4; at the same time, when the second anti-collision shell 3 rotates with the backrest 6 shaft and continuously presses the touch bearing platform 21 of the back end of the first anti-collision shell 2, the first anti-collision shell 2 can also be lifted to trigger the limit switch 4, realizing active anti-collision.

[0060] Through this structure, "passive anti-collision + active anti-collision" double warning and protection can be formed in use, which can block the movement of the backrest 6 in advance, avoid the feet of medical staff being pressed or the chair back colliding with the object behind, and improve the safety of the posture adjustment process.

[0061] In addition, the surface of the touch support 21 and the leg pressing touch support 22 is covered with flexible material, including rubber covering, silica gel pad or elastic polyurethane, which provides buffering and anti-skid functions when obstacles are sensed. Micro pressure sensors can also be added to the outside of the touch support 21 and the leg pressing touch support 22 to collect collision pressure information in real time and feed back to the controller, so as to further improve the intelligent degree of protection.

[0062] As shown in the above embodiment of the structure of the first anti-collision shell 2 installed on the base 1 and the structure of the base 1 cooperating with the installation of the first anti-collision shell 2, the two side walls of the base 1 are each provided with two mounting columns 11, which are adjacent to the back end and the leg end of the base 1 respectively. Figure 1 and Figure 2 As shown in the above embodiment of the structure of the first anti-collision shell 2 installed on the base 1 and the structure of the base 1 cooperating with the installation of the first anti-collision shell 2, the two side walls of the base 1 are each provided with two mounting columns 11, which are adjacent to the back end and the leg end of the base 1 respectively.

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

[0064] In the application, during the installation and debugging of the dental chair, the operator hangs the mounting slots 231 of the two side mounting ears 23 of the first anti-collision shell 2 on the mounting columns 11 of the two side walls of the base 1, so that the first anti-collision shell 2 is hung below the base 1 and kept in an inclined posture.

[0065] During the adjustment of the posture of the dental chair, the mounting slot 231 of the mounting ear 23 adjacent to the back end of the base 1 rotates around the mounting column 11 to drive the back end of the first anti-collision shell 2 to lift up; at the same time, the mounting slot 231 of the mounting ear 23 adjacent to the leg end of the base 1 guides the leg end of the first anti-collision shell 2 to move up along the mounting column 11, forming a smooth swing track; through the structure design of “back end rotation + leg end guidance”, the first anti-collision shell 2 can quickly and stably swing up to trigger the limit switch 4 when obstacles are sensed, realizing accurate anti-collision and avoiding false triggering of the limit switch 4 by the first anti-collision shell 2.

[0066] As shown in the above embodiment of the structure of the first anti-collision shell 2 triggering the limit switch 4, the mounting ear 23 adjacent to the back end of the base 1 is provided with a touch step 232; when the first anti-collision shell 2 swings up, the mounting slot 231 of the mounting ear 23 adjacent to the back end of the base 1 rotates around the mounting column 11, and the touch step 232 gradually rises and presses the touch arm 41 of the limit switch 4. Figure 1 and Figure 2 As shown in the above embodiment of the structure of the first anti-collision shell 2 triggering the limit switch 4, the mounting ear 23 adjacent to the back end of the base 1 is provided with a touch step 232; when the first anti-collision shell 2 swings up, the mounting slot 231 of the mounting ear 23 adjacent to the back end of the base 1 rotates around the mounting column 11, and the touch step 232 gradually rises and presses the touch arm 41 of the 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, a pre-warning distance value range between the first anti-collision shell 2 and the bottom surface of the base 1 is preset in the controller of the dental chair; the distance sensor 5 senses the distance information between the first anti-collision shell 2 and the bottom surface of the base 1, and the controller of the dental chair issues a posture adjustment collision pre-warning warning on the control screen after determining that the currently measured distance information enters the pre-warning distance value range, and reduces the adjustment speed of the corresponding seat posture or backrest 6 posture of the dental chair until the first anti-collision shell 2 is triggered by the limit switch 4 to stop the adjustment of the seat posture or backrest 6 posture of the dental chair.

[0075] In the application, during the adjustment of the seat posture or backrest 6 posture of the dental chair, the distance sensor 5 installed below the base 1 continuously detects the first anti-collision shell 2, and real-time collects the distance information between the first anti-collision shell 2 and the bottom surface of the base 1 and transmits it to the controller of the dental chair.

[0076] The controller is preset with a pre-warning distance value range, when the distance information enters the pre-warning range, the controller will immediately issue a collision pre-warning prompt on the control screen, and automatically reduce the corresponding posture adjustment speed to a preset slow speed, so that the dental chair has the active safety function of “pre-warning first and then reducing speed”; if the obstacle exists and causes the first anti-collision shell 2 to be lifted to trigger the limit switch 4, the controller will immediately interrupt the adjustment action and enter the safe stop state.

[0077] Through the double-layer protection mechanism formed by the combination of the distance sensor 5 and the limit switch 4, the dental chair can not only sense the potential collision risk in advance when adjusting the posture, but also dynamically reduce the movement speed and stop immediately when necessary, which significantly improves the protection safety of the feet of medical staff and the objects behind the back of the chair, and reduces the risk of injury and equipment damage.

[0078] Based on the above embodiment of the anti-collision and anti-pressure mechanism, an anti-collision and anti-pressure control method of a dental chair is provided, which includes the following control steps: S1, initialization and state monitoring: the controller of the dental chair reads the state of the limit switch corresponding to the first anti-collision shell and the second anti-collision shell after power-on, and real-time receives the distance information of the distance sensor below the base, and establishes and stores the initial state of the seat and the backrest and the pre-warning distance value range according to the input state of the corresponding part of the posture adjustment mechanism;

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

[0080] S3, linkage triggering and emergency stop: when the first anti-collision shell or the second anti-collision shell is continuously swung upward due to an external obstacle or a backrest swing, and the first anti-collision shell triggers the limit switch, the controller immediately stops the current adjustment of the cushion posture or the backrest posture 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 double verification on the limit switch signal and the distance sensor signal, and when the distance sensor signal is inconsistent with the limit switch signal, the controller executes the emergency stop instruction of the limit switch according to the priority, and records the abnormal state for subsequent calibration;

[0082] S5, intelligent recovery and readjustment: after the emergency stop, the controller determines whether to restore the safe distance according to the detection result of the distance sensor, and if the distance between the first anti-collision shell and the bottom surface of the base reaches the safe distance, the controller automatically releases the lock and allows the adjustment action to be executed again, or prompts the operator to restart the adjustment instruction.

[0083] In the application, through the above control steps, the limit switch and the distance sensor are used to cooperatively judge, so that the dental chair can automatically prewarn, actively decelerate and quickly stop when necessary during the posture adjustment, forming multi-level active and passive anti-collision and anti-pressure protection, and achieving comprehensive safety protection for medical personnel, patients and surrounding equipment.

[0084] In the pre-warning distance judgment step S2, the controller dynamically adjusts the pre-warning distance value range according to 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 cushion posture or the backrest posture of the dental chair is higher than a preset threshold, the pre-warning distance value range is automatically increased to trigger the deceleration and pre-warning in advance; and when the adjustment speed is lower than the preset threshold, the pre-warning distance value range is automatically reduced to avoid false triggering.

[0086] In the application, the dynamic adjustment mechanism in the pre-warning distance judgment step S2 can adaptively adjust the pre-warning threshold according to the movement speed of the adjustment of the cushion posture or the backrest posture of the dental chair, and improve the sensitivity and accuracy of the protection response.

[0087] In the intelligent recovery and readjustment step S5, after detecting that the distance between the first anti-collision shell and the bottom surface of the base reaches the safe distance, the controller first drives the dental chair to retreat to a preset safe posture interval in a low-speed fine adjustment mode, and releases the posture adjustment lock after completing the retreat to allow the operator to input a new adjustment instruction; if the limit switch is triggered again during the low-speed fine adjustment retreat, the controller enters a secondary lock mode and prompts manual inspection on the control screen.

[0088] In the application, the intelligent recovery and readjustment step S5 introduces the "automatic rollback + secondary locking" strategy, which not only ensures the rapid recovery ability of the first anti-collision shell and the limit switch after the false triggering, but also avoids secondary collision in complex environment, and improves the robustness and safety of the overall control of the anti-collision and anti-pressure mechanism of the dental chair.

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

Claims

1. A collision and pressure preventing mechanism of a dental chair, characterized by comprising: The application relates to a dental chair, which comprises a first anti-collision shell, a second anti-collision shell and a limit switch arranged on the base of the dental chair; the first anti-collision shell is swingably hung below the base and is arranged in a downwardly-inclined manner from the back end to the leg end of the base of the dental chair; the second anti-collision shell is installed on the rotating shaft of the backrest of the dental chair in a following-rotation manner; the limit switch is arranged on both sides of the base and is surrounded by the first anti-collision shell, the touch arm of the limit switch is swung upward by the first anti-collision shell to trigger; when the first anti-collision shell is lifted by the obstacle below the base, the first anti-collision shell swings upward to a range for triggering the limit switch, the limit switch sends a position signal to the controller of the dental chair to stop the posture adjustment action of the seat cushion of the dental chair; when the second anti-collision shell rotates along with the rotating shaft of the backrest and gradually presses the back end of the first anti-collision shell downward, the first anti-collision shell swings toward the base, the second anti-collision shell drives the first anti-collision shell to swing upward to the range for triggering the limit switch, the limit switch sends a position signal to the controller of the dental chair to stop the posture adjustment action of the backrest of the dental chair; The back end of the first anti-collision shell is outwardly extended at the lower part and inwardly contracted at the upper part to form a touch bearing platform which is downwardly inclined and matched with the second anti-collision shell; the leg end of the first anti-collision shell is provided with a downwardly-protruding leg-pressing touch platform; The second anti-collision shell is provided with a touch profile which interferes with the touch bearing platform of the first anti-collision shell; the touch profile gradually increases in the counterclockwise direction, and the straight-line distance from the rotating center of the second anti-collision shell to the touch profile gradually increases; The application further comprises a distance sensor; the distance sensor is installed below the base, and the detection end of the distance sensor faces the first anti-collision shell, which is used for detecting the distance between the first anti-collision shell and the bottom surface of the base and sending distance information to the controller of the dental chair; The controller of the dental chair is pre-set with a pre-warning distance value range between the first anti-collision shell and the bottom surface of the base; the distance sensor senses the distance information between the first anti-collision shell and the bottom surface of the base, and after the controller of the dental chair judges that the currently-measured distance information enters the pre-warning distance value range, the controller of the dental chair sends a posture adjustment collision pre-warning warning of the seat cushion posture or the backrest posture on the control screen, and reduces the adjustment speed of the corresponding seat cushion posture or backrest posture of the dental chair until the first anti-collision shell swings to trigger the limit switch to stop the adjustment of the seat cushion posture or the backrest posture of the dental chair.

2. The crash and crush protection mechanism of claim 1, wherein The length direction of the base is provided with two mounting columns on both sides, and the two mounting columns are adjacent to the back end and the leg end of the base respectively; the first anti-collision shell is provided with mounting ears on both sides, and the mounting ears are provided with vertically arranged mounting grooves; the first anti-collision shell is hung on the mounting columns of the base through the mounting grooves; when the first anti-collision shell is triggered to swing up, the mounting groove of the mounting ear adjacent to the back end of the base rotates around the mounting column, so that the back end of the first anti-collision shell rotates, and the mounting groove of the mounting ear adjacent to the leg end of the base guides the leg end of the first anti-collision shell to move up.

3. The crash and crush protection mechanism of claim 2, wherein The mounting ear adjacent to the back end of the base is provided with a touch control step; when the first anti-collision shell is triggered to swing up, the mounting groove of the mounting ear adjacent to the back end of the base rotates around the mounting column, and the touch control step gradually rises and depresses the touch arm of the limit switch.

4. A control method of a collision and pressure preventing mechanism of a dental chair, comprising the collision and pressure preventing mechanism according to any one of claims 1 to 3, characterized by, The control steps include the following: S1, initialization and state monitoring: the controller of the dental chair reads the state of the limit switch corresponding to the first anti-collision shell and the second anti-collision shell after power-on, and receives distance information of the distance sensor below the base in real time, cooperates with the input state of the corresponding part of the posture adjusting mechanism, establishes and stores the initial state and the pre-warning distance value range of the seat cushion and the backrest; S2, pre-warning distance judgment: when the seat cushion posture or the backrest posture adjusting action of the dental chair is executed, the controller judges whether the distance information between the first anti-collision shell and the bottom surface of the base enters the pre-warning distance value range in real time; if it enters the pre-warning range, the controller displays a collision pre-warning warning on the control screen, and automatically reduces the movement speed of the corresponding adjusting action to a preset slow speed; S3, linkage triggering and emergency stop: when the first anti-collision shell or the second anti-collision shell is triggered due to external obstacles or backrest swinging, the first anti-collision shell continuously swings up and triggers the limit switch, the controller immediately stops the seat cushion posture or backrest posture adjusting action currently executed by the dental chair, and locks the posture to maintain a safe state; S4, multi-point redundancy judgment and dynamic compensation: the controller performs double verification 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 instruction of the limit switch according to the priority, and records the abnormal state for subsequent calibration; S5, intelligent recovery and re-adjustment: after the emergency stop, the controller judges whether to restore the safe distance according to the detection result of the distance sensor, if the distance between the first anti-collision shell and the bottom surface of the base reaches the safe distance, the controller automatically releases the lock and allows the posture adjusting action to be executed again, or prompts the operator to restart the adjusting instruction.

5. The collision and crush prevention control method according to claim 4, characterized by, In the pre-warning distance judgment step S2, the controller dynamically adjusts the pre-warning distance value range according to 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 adjusting speed of the seat cushion posture or the backrest posture of the dental chair is higher than the preset threshold, the pre-warning distance value range is automatically increased to trigger the speed reduction and pre-warning in advance; when the adjusting speed is lower than the preset threshold, the pre-warning distance value range is automatically reduced to avoid false triggering.

6. The collision and crush prevention control method according to claim 4, characterized by In the intelligent recovery and readjustment step of S5, after detecting that the distance between the first anti-collision shell and the bottom surface of the base reaches the safe distance, the controller first drives the dental chair to retreat to the preset safe posture interval in a low-speed fine adjustment mode, and after completing the retreat, releases the posture adjustment lock to allow the operator to input a new adjustment instruction; if the limit switch is triggered again during the low-speed fine adjustment retreat, the controller enters a secondary lock mode and prompts manual inspection on the control screen.

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