Dental comprehensive treatment chair

Abstract

A dental comprehensive treatment chair relates to the technical field of medical instruments and comprises a head support, a chair back and a base, the head support is used for fixing the head of a patient to reduce unintentional movement of the head of the patient, the head support and the chair back are respectively mounted on the base, the dental comprehensive treatment chair further comprises a driving device and a head support locking device, and the driving device is connected with the head support to drive the head support to laterally rotate. The head support locking device can lock or unlock the head support, when the head support needs to be rotated, the head support locking device unlocks the head support, the driving device drives the head support to rotate laterally, and after the head support rotates in place laterally, the head support locking device locks the head support. By arranging the rotatable head support and controlling rotation through the rotation driving device, a dentist can easily adjust the head of a patient to a proper treatment angle and keep the head of the patient fixed so as to prevent the head of the patient from moving unintentionally, and the rotation angle of the head of the patient does not need to be adjusted after the head of the patient is fixed without being interrupted; and the efficiency, the continuity and the operation flexibility in the treatment process can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a dental comprehensive treatment chair. Background Art

[0002] A dental chair with a head fixation device is an advanced medical device designed specifically for oral treatment. It integrates a position-fixing function for stabilizing the patient's head to ensure accurate operation and patient safety and comfort during treatment. The head fixation device can effectively reduce unintentional movement of the patient's head and avoid treatment errors caused by unconscious movements. This is particularly important for long-term treatments and operations requiring high precision. However, the head fixation devices of existing technologies are generally non-rotatable, and the patient's head is difficult to rotate after being fixed. As a result, when facing treatment at certain specific angles, the dentist needs to interrupt the operation to release the head fixation, adjust the rotation angle of the patient's head, and then re-fix the patient's head, which has a certain impact on the efficiency and consistency of treatment. Summary of the Invention

[0003] In view of this, the present invention provides a dental comprehensive treatment chair, in which the head fixing device can be controlled to rotate laterally when the patient's head needs to be rotated, without having to interrupt the operation to release the head fixation and then adjust the rotation angle of the patient's head.

[0004] To achieve the above objectives, the present invention provides the following technical solutions.

[0005] The comprehensive dental treatment chair includes a headrest, a chair back and a base. The headrest is used to fix the patient's head to reduce unintentional movement of the patient's head. The headrest and the chair back are respectively installed on the base. It also includes a driving device and a headrest locking device. The driving device is connected to the headrest to drive the headrest to rotate lateraly. The headrest locking device can lock or unlock the headrest. When the headrest needs to be rotated, the headrest locking device unlocks the headrest, and the driving device drives the headrest to rotate lateraly. After the headrest is rotated lateraly into place, the headrest locking device locks the headrest.

[0006] By providing a rotatable headrest and controlling the rotation through a driving device, the dentist can easily adjust the patient's head to a suitable treatment angle, while keeping the patient's head fixed to prevent unintentional movement of the head. There is no need to interrupt the operation to release the head fixation and then adjust the rotation angle of the patient's head, which can improve the efficiency, consistency and operational flexibility of the treatment process.

[0007] Furthermore, the head support is provided with a driven shaft, the driving device includes a driving motor and an interlocking coupling, the interlocking coupling includes a slide seat, a connecting shaft and a first spring, the slide seat is fixed to the rotating shaft of the driving motor, the connecting shaft is slidably connected to the slide seat so as to be able to slide along the axial direction of the rotating shaft of the driving motor, the first spring is respectively connected to the slide seat and the connecting shaft to push the connecting shaft and the driven shaft to maintain elastic contact, the connecting shaft and the driven shaft are respectively provided with mutually interlocking convex teeth, so that the connecting shaft can drive the driven shaft to rotate through the friction force between the convex teeth, and in the process of the driving motor driving the head support to rotate laterally, when the force of the driving motor driving the head support to rotate is greater than the friction force between the convex teeth, the connecting shaft and the driven shaft slip to avoid spraining the patient's neck.

[0008] Furthermore, the dental comprehensive treatment chair also includes an active disconnecting device, which includes a first oil cylinder for pushing the connecting shaft to slide axially and a trigger oil cylinder for driving the first oil cylinder. When the trigger oil cylinder is pressed, the trigger oil cylinder drives the first oil cylinder to push the connecting shaft, so that the connecting shaft is disengaged from the driven shaft, thereby preventing the driving motor from driving the headrest.

[0009] Furthermore, the active disconnecting device also includes a boosting chamber and a boosting cylinder. The boosting chamber is filled with hydraulic oil and connected to the first cylinder. The boosting cylinder is connected to the trigger cylinder to be driven by the trigger cylinder. The boosting cylinder includes a boosting cylinder body and a boosting piston rod. The boosting piston rod includes a driving end with a larger end face area and a boosting end with a smaller end face area. The driving end is slidably connected to the boosting cylinder body, and the boosting end is slidably connected to the boosting chamber. When the trigger cylinder is driven, the trigger cylinder drives the boosting cylinder so that the boosting end of the boosting piston rod pushes the hydraulic oil in the boosting chamber, thereby outputting relatively high-pressure hydraulic oil to push the first cylinder.

[0010] Furthermore, the chair back is rotatably connected to the base so as to be able to rotate laterally, and the chair back is provided with a locking hole. The comprehensive dental treatment chair also includes a chair back locking mechanism, which includes a chair back locking pin, a rotating lever, a locking cylinder and a locking cylinder. The chair back locking pin can be inserted into the locking hole to lock the chair back or withdrawn from the locking hole to unlock the chair back. The rotating lever is fixedly connected to the headrest so as to rotate laterally with the headrest. The locking cylinder is connected to the chair back locking pin to drive the chair back locking pin to insert into or withdraw from the locking hole. The locking cylinder is used to drive the locking cylinder. The locking cylinder includes a locking cylinder body, a locking piston rod and a second spring. The locking piston rod extends into the locking cylinder body and It is slidable, and the second spring is arranged in the lock-driving cylinder body and connected to the lock-driving piston rod to provide the lock-driving piston rod with the elastic force to reset. There are two lock-driving cylinders, which correspond to the two sides of the lateral rotation of the head support. When the rotating lever rotates laterally to one side with the head support, the rotating lever presses the lock-driving piston rod of the lock-driving cylinder on the corresponding side, and the lock-driving cylinder drives the locking cylinder, and the locking cylinder drives the seat back locking pin to exit the locking hole to unlock the seat back. After the seat back is reset to the center and the rotating lever is reset to the center with the head support, the second spring drives the lock-driving piston rod to reset, and the lock-driving cylinder drives the locking cylinder, and the locking cylinder drives the seat back locking pin to insert into the locking hole, thereby re-locking the seat back.

[0011] Furthermore, the chair back is provided with a limit slot, and the chair back locking mechanism includes a limit assembly, which includes a limit block, a third spring, and a limit valve. The limit block can be pushed into the limit slot. Two limit blocks are provided, one corresponding to each side of the headrest's lateral rotation. Once inserted into the limit slot, the limit block restricts the angle and direction of lateral rotation of the chair back, with the direction being the side of the headrest's lateral rotation corresponding to the limit block. The third spring is connected to the limit block to provide elastic force for the limit block to exit the limit slot. The limit valve includes a sliding valve core, a contact block, a valve core chamber and a drive lock chamber. The two ends of the valve core chamber are respectively connected to the two drive lock cylinders. An oil filling port is provided between the valve core chamber and the drive lock chamber to connect the valve core chamber and the drive lock chamber. The drive lock chamber is connected to the locking oil cylinder. Two ends of the valve core chamber are respectively provided with a one-way conductive return oil channel connected to the drive lock chamber. The conduction direction of the return oil channel is from the drive lock chamber to the valve core chamber. The contact block is fixedly connected to the sliding valve core. The sliding valve core is provided in the valve core chamber and can slide to the two ends of the valve core chamber respectively. When the sliding valve core is located in the center position of the valve core chamber, the sliding valve core blocks the oil filling port. When the sliding valve core is located in the non-center position of the valve core chamber, the oil filling port is opened. When the rotary lever rotates to one side along with the headrest, the rotary lever presses the locking piston rod of the locking cylinder on the corresponding side, and the locking cylinder pushes the sliding valve core to slide toward the side in the valve core cavity. The contact block moves toward the side along with the sliding valve core to push the limit block on the corresponding side to insert into the limit groove. At the same time, the oil filling port is opened, and the locking cylinder drives the locking cylinder via the valve core cavity, the oil filling port, and the locking cavity to unlock the chair back. After the chair back is reset to the center, the rotary lever resets to the center along with the headrest, and the locking piston rod of the locking cylinder resets, driving the sliding valve core to slide to the center position of the valve core cavity. The contact block disengages from the limit block, and the limit block exits the limit groove. At the same time, the oil filling port is blocked, and the locking cylinder drives the locking cylinder via the lock cavity, the oil return channel, and the valve core cavity to re-lock the chair back.

[0012] Furthermore, the headrest locking device includes a locking electromagnet and a locking tooth groove. The locking electromagnet can be controlled to extend and retract. The locking tooth groove is installed on the headrest so as to rotate with the headrest. When the locking electromagnet is extended, it can engage with the locking tooth groove. When the headrest needs to be locked, the locking electromagnet is controlled to extend to lock the headrest. When the headrest needs to be rotated, the locking electromagnet is controlled to retract to unlock the headrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the dental comprehensive treatment chair of the present invention.

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the dental comprehensive treatment chair of the present invention from another perspective.

[0015] Figure 3 This is an exploded view of the dental treatment chair of the present invention (the base is hidden for ease of display).

[0016] Figure 4 for Figure 3 Enlarged schematic diagram of point A in the middle.

[0017] Figure 5 Exploded view of the head support, mating coupling, and drive motor.

[0018] Figure 6 for Figure 5 Enlarged schematic diagram of point B in the middle.

[0019] Figure 7 This is a cross-sectional view of the mating coupling and the drive motor in the mating state.

[0020] Figure 8 Schematic diagram of the three-dimensional structure of the chair back.

[0021] Figure 9 It is a three-dimensional structural diagram of the seat back and the seat back locking mechanism.

[0022] Figure 10 A cross-sectional view of the seat back and locking cylinder.

[0023] Figure 11 A cross-sectional view of the locking cylinder and rotary lever.

[0024] Figure 12 This is a schematic diagram of the three-dimensional structure of the chair back and limit assembly (partially cut away for ease of display).

[0025] Figure 13 This is an exploded view of the limit valve assembly (partial sectioning is performed to facilitate display of the limit valve).

[0026] Figure 14 (a) is a cross-sectional view of the seat back and the limit assembly when the limit block is retracted, and (b) is a cross-sectional view of the seat back and the limit assembly when the limit block on one side is extended.

[0027] Figure 15 It is a cross-sectional view of the limit valve when the sliding valve core moves to one end of the valve core cavity.

[0028] Reference numerals include: Head support 1, driving motor 11, interlocking coupling 12, slide seat 121, connecting shaft 122, first spring 123, convex tooth 124, driven shaft 13, locking electromagnet 14, locking tooth groove 141, first oil cylinder 15, trigger oil cylinder 16, booster chamber 17, booster oil cylinder 18, booster piston rod 181; Chair back 2, locking hole 21, chair back locking pin 22, locking cylinder 23, lock drive cylinder 24, lock drive cylinder body 241, lock drive piston rod 242, second spring 243, rotary lever 25, limit groove 26, limit assembly 27, limit block 271, third spring 2711, limit valve 272, sliding valve core 273, contact block 274, valve core chamber 275, lock drive chamber 276, oil filling port 277, oil return channel 278, one-way valve 279, fixed seat 28; Base 3, rotating shaft 31, limiting protrusion 311. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to specific embodiments.

[0030] like Figure 1 and Figure 2 As shown, the dental comprehensive treatment chair of this embodiment includes a headrest 1, a chair back 2 and a base 3. The headrest 1 is used to fix the patient's head to reduce unintentional movement of the patient's head. The base 3 is provided with a rotating shaft 31 extending to the rear of the chair back 2. The headrest 1 is rotatably connected to the rotating shaft 31 through a bearing. Figure 3-Figure 6 The comprehensive dental treatment chair of this embodiment also includes a driving device and a head support locking device. The driving device includes a driving motor 11 and an interlocking coupling 12. The driving motor 11 is connected to the head support 1 through the interlocking coupling 12 to drive the head support 1 to rotate laterally. The driving motor 11 of this embodiment is a brake motor, and an electromagnetic brake is provided at the tail. After the driving motor 11 drives the head support 1 to rotate laterally to the right position, the electromagnetic brake brakes the rotating shaft of the driving motor 11 and prevents the driving motor 11 from rotating, thereby locking the head support 1 after the head support 1 is driven to select the target angle laterally. The head support locking device includes a locking electromagnet 14 and a locking tooth groove 141. The locking electromagnet 14 can be controlled to extend and retract. The locking tooth groove 141 is installed on the head support 1 to rotate with the head support 1. When the locking electromagnet 14 is extended, it can be engaged with the locking tooth groove 141. When the headrest 1 needs to be rotated, the locking electromagnet 14 is controlled to retract, and the locking electromagnet 14 is disengaged from the locking tooth groove 141 to unlock the headrest 1. The driving motor drives the headrest 1 to rotate laterally. After the headrest 1 is rotated laterally to the desired position, the locking electromagnet 14 is controlled to extend, and the locking electromagnet 14 is engaged with the locking tooth groove 141 to lock the headrest 1. By providing the driving motor 11 to control the rotation of the headrest 1, the dentist can easily adjust the patient's head to a suitable treatment angle without having to interrupt the operation to release the head fixation and then adjust the rotation angle of the patient's head, thereby improving the efficiency, consistency and operational flexibility of the treatment process.

[0031] The patient's neck cannot be subjected to too much external force, otherwise it is easy to sprain. Therefore, it is necessary to prevent the head support 1 from forcibly rotating the patient's head sideways, and it is also necessary to prevent the driving device from driving the head support 1 to rotate sideways too fast and spraining the patient's neck. At the same time, during the treatment process, it is also possible that the patient's head may exert too much resistance on the head support 1, causing damage to the driving device. Figure 5-Figure 7 The head support 1 is provided with a driven shaft 13, and the engaging coupling 12 includes a slide seat 121, a connecting shaft 122 and a first spring 123. The slide seat 121 is fixedly connected to the rotating shaft of the driving motor 11, and the connecting shaft 122 and the slide seat 121 are respectively provided with corresponding protrusions and slide grooves. The connecting shaft 122 is slidably connected to the slide seat 121 through the cooperation of the protrusion and the slide groove, so that the connecting shaft 122 can slide along the axial direction of the driving motor 11. The first spring 123 is respectively connected to the slide seat 121 and the connecting shaft 122 to push the connecting shaft 122 to maintain elastic contact with the driven shaft 13. The connecting shaft 122 and the driven shaft 13 are respectively provided with convex teeth 124 that engage with each other, so that the connecting shaft 122 can pass between the convex teeth 124. The friction force drives the driven shaft 13 to rotate. During the process of the driving motor 11 driving the head support 1 to rotate laterally, when the force of the driving motor 11 driving the head support 1 to rotate is greater than the friction force between the convex teeth 124, or when the resistance applied by the head support 1 to the driving motor 11 is greater than the friction force between the convex teeth 124, the connecting shaft 122 and the driven shaft 13 will slip. The slippage causes the convex teeth 124 to be unable to continue to maintain the engaged state. At this time, the driving motor 11 and the head support 1 are equivalent to being disconnected, and neither will drive the other to rotate, thereby avoiding the head support 1 forcibly rotating and spraining the patient's neck, or the head support 1 forcibly driving the driving motor 11 to rotate and causing damage to the driving motor 11, thereby improving the safety of the treatment process and the reliability of the equipment.

[0032] In an emergency, such as when the patient suddenly feels unwell or the device fails, it is necessary to quickly disconnect the connection between the driving motor 11 and the headrest 1 to stop the headrest 1 from rotating. Figure 2 and Figure 7 As shown, the dental unit chair of this embodiment also includes an active disconnect device, which includes a first oil cylinder 15 for driving the connecting shaft 122 to slide axially, and a trigger oil cylinder 16 for driving the first oil cylinder 15. The trigger oil cylinder 16 can be located in a place that is easily accessible to the patient or doctor. When the trigger oil cylinder 16 is pressed, the trigger oil cylinder 16 drives the first oil cylinder 15 to push the connecting shaft 122, causing the connecting shaft 122 to break contact with the driven shaft 13, thereby preventing the driving motor 11 from driving the headrest 1. The provision of the active disconnect device allows the dentist or patient to manually disconnect the driving motor 11 and the headrest 1 when necessary.

[0033] When the patient has less strength or it is difficult for the patient to exert force in a certain posture, the patient may not be able to trigger the active disconnection device. Figure 7As shown, the active disconnect device also includes a booster chamber 17 and a booster cylinder 18. The booster chamber 17 is filled with hydraulic oil and communicates with the first cylinder 15. The booster cylinder 18 communicates with the trigger cylinder 16 and is driven by the trigger cylinder 16. The booster cylinder 18 includes a booster cylinder body and a booster piston rod 181. The booster piston rod 181 includes a driving end with a larger end surface area and a booster end with a smaller end surface area. The driving end is slidably connected to the booster cylinder body, and the booster end is slidably connected to the booster chamber 17. According to Pascal's law, the same force applied to a small area will generate a greater pressure than when applied to a large area. When the trigger cylinder 16 is actuated, the relatively low-pressure hydraulic oil in the trigger cylinder 16 drives the booster cylinder 18, causing the booster end of the booster piston rod 181 to push the booster chamber 17 to output relatively high-pressure hydraulic oil, thereby pushing the first cylinder 15. By setting up a booster cylinder 18 to drive the first cylinder 15 to extend, and utilizing a booster piston rod 181 with different end surface areas at both ends, the low-pressure oil input by the trigger cylinder 16 contacts the driving end with a larger pushing area, and the booster end with a smaller area pushes the hydraulic oil in the booster cavity 17 to output high-pressure oil, so that the booster cylinder 18 pushes the first cylinder 15 to extend with a higher pressure, that is, the patient can trigger the active disconnection device with less effort, making the triggering process simpler and easier.

[0034] After the patient's head is rotated sideways for a long time with the headrest 1, the neck is prone to soreness and discomfort. Figure 2-Figure 3 、 Figures 8-11 The chair back 2 of this embodiment is rotatably connected to the rotating shaft 31 so as to be rotatable laterally. The chair back 2 is provided with a locking hole 21. The dental comprehensive treatment chair of this embodiment also includes a chair back locking mechanism, which includes a chair back locking pin 22, a rotating lever 25, a locking cylinder 23 and a locking cylinder 24. When the chair back locking pin 22 is inserted into the locking hole 21, the chair back 2 is locked, and when the chair back 2 is withdrawn from the locking hole 21, the chair back 2 is unlocked. The rotating lever 25 is fixedly connected to the headrest 1 so as to rotate laterally with the headrest 1. The locking cylinder 23 is connected to the chair back locking pin 22 to drive the chair back locking pin 22 to insert or withdraw from the locking hole 21. The locking cylinder 24 is used to drive the locking cylinder 23. The locking cylinder 24 includes a locking cylinder body 241, a driving cylinder body 242, a driving cylinder body 243, a driving cylinder body 244, a driving cylinder body 245, a driving cylinder body 246, a driving cylinder body 247, a driving cylinder body 248, a driving cylinder body 249, a driving cylinder body 249, a driving cylinder body 241 ... The locking piston rod 242 and the second spring 243, the locking piston rod 242 extends into the locking cylinder body 241 and can slide. The second spring 243 is arranged in the locking cylinder body 241 and connected to the locking piston rod 242 to provide the locking piston rod 242 with a resetting elastic force. The locking oil cylinder 24 is provided with two, which respectively correspond to the two sides of the lateral rotation of the head support 1. When the rotating lever 25 rotates to one side with the head support 1, the rotating lever 25 presses the locking piston rod 242 of the locking oil cylinder 24 on the corresponding side. The locking oil cylinder 24 drives the locking oil cylinder 23, and the locking oil cylinder 23 drives the seat back locking pin 22 to exit the locking hole 21 to unlock the seat back 2. After the seat back 2 is reset to the center and the rotating lever 25 is reset to the center with the head support 1 ( Figure 11The figure shows the state of the rotation lever 25 and the two locking cylinders 24 when the chair back 2 is reset to the center. The second spring 243 drives the locking piston rod 242 to reset, and the locking cylinder 24 drives the locking cylinder 23. The locking cylinder 23 drives the chair back locking pin 22 to insert into the locking hole 21, thereby relocking the chair back 2. By making the chair back 2 rotatable and unlocking the chair back 2 after the headrest 1 is rotated sideways, the patient can adjust the body position independently, avoiding neck pain caused by maintaining a turned head posture for a long time. During continuous treatment, the number of interruptions due to position adjustment can be reduced, making the entire treatment process more consistent and efficient, and improving the satisfaction of both patients and dentists.

[0035] When the rotation direction of the chair back 2 is opposite to the rotation direction of the patient's head, or the rotation angle between the chair back 2 and the patient's head is too large, it is easy to cause the patient's neck to be strained or even cause damage to the patient's cervical spine. Figure 8 and Figure 14 As shown in (a), the chair back 2 is also provided with a limiting groove 26, and a limiting protrusion 311 is provided on the rotation shaft 31. The limiting protrusion 311 is located in the middle of the limiting groove 26. When the limiting groove 26 rotates to both sides along with the chair back 2, the limiting protrusion 311 will contact and engage with both ends of the limiting groove 26, thereby limiting the rotation angle of the chair back 2. Figure 12-15 The seat back locking mechanism also includes a limit assembly 27, which includes a limit block 271, a third spring 2711 and a limit valve 272. A fixing seat 28 is provided at the notch of the limit groove 26. The limit block 271 is slidably connected to the fixing seat 28 so as to be pushed into the limit groove 26. There are two limit blocks 271, which correspond to the two sides of the lateral rotation of the head support 1, such as Figure 14 As shown in (b), after the stopper block 271 on one side is inserted into the stopper slot 26, the end surface of the stopper slot 26 on that side engages with the stopper block 271, thereby preventing the chair back 2 from rotating laterally. Specifically, the chair back 2 can only rotate laterally in the same direction as the headrest 1. For example, after the headrest 1 rotates to the left, the chair back 2 can only rotate to the left, not the right. This prevents the patient's head from rotating excessively and potentially causing injury. A third spring 2711 connects the stopper block 271 and the mounting base 28, providing the elastic force that forces the stopper block 271 out of the stopper slot 26.

[0036] Combine Figure 12-13 and Figure 15The limit valve 272 includes a sliding valve core 273, a contact block 274, a valve core chamber 275 and a drive lock chamber 276. The two ends of the valve core chamber 275 are connected to the two drive lock cylinders 24. An oil filling port 277 is provided between the valve core chamber 275 and the drive lock chamber 276 to connect the valve core chamber 275 and the drive lock chamber 276 (the oil filling port 277 refers to the opening formed at the connection between the valve core chamber 275 and the drive lock chamber 276, which is long). The drive lock chamber 276 is connected to the locking cylinder 23. The two ends of the valve core chamber 275 are connected to the drive lock chamber 276. The return oil channel 278 is provided with a one-way valve 279 for one-way conduction, and the conduction direction is from the drive lock chamber 276 to the valve core chamber 275. The contact block 274 is fixedly connected to the sliding valve core 273. The sliding valve core 273 is arranged in the valve core chamber 275 and can slide to both ends of the valve core chamber 275 respectively. When the sliding valve core 273 is located in the center position of the valve core chamber 275, the sliding valve core 273 blocks the oil filling port 277. When the sliding valve core 273 is located in the non-center position of the valve core chamber 275, the oil filling port 277 is opened. When the rotating lever 25 rotates laterally to one side along with the headrest 1, the rotating lever 25 presses the locking piston rod 242 of the locking cylinder 24 on the corresponding side, and the locking cylinder 24 pushes the sliding valve core 273 to slide toward the side in the valve core chamber 275. The contact block 274 moves toward the side along with the sliding valve core 273 to push the limiting block 271 on the corresponding side to insert into the limiting groove 26. At the same time, the oil filling port 277 is opened, and the locking cylinder 24 drives the locking cylinder 23 via the valve core chamber 275, the oil filling port 277 and the locking chamber 276 to unlock the chair back 2. After the chair back 2 is centered, the rotating lever 25 returns to the center along with the headrest 1. The locking piston rod 242 of the locking cylinder 24 is reset, driving the sliding valve core 273 to slide to the center position of the valve core chamber 275. The contact block 274 disengages the limiting block 271. Under the elastic force of the third spring 2711, the limiting block 271 is reset and exits the limiting groove 26. Simultaneously, the oil filling port 277 is blocked. The locking cylinder 24 then drives the locking cylinder 23 via the locking cavity 276, the oil return channel 278, and the valve core chamber 275 to relock the chair back 2. Therefore, the limiting assembly 27 ensures that the rotation direction of the chair back 2 is consistent with the rotation direction of the headrest 1, and the limiting groove 26 limits the rotation angle of the chair back 2. This prevents the patient's neck from being strained due to opposite rotation of the chair back 2 and the headrest 1 or an excessive rotation angle between the two, thereby improving safety and reliability.

[0037] Combine Figure 11 and Figure 15When the sliding valve core 273 slides toward one end of the valve core chamber 275, the hydraulic oil in the valve core chamber 275 will be pushed into the locking cylinder 24 connected to the end of the valve core chamber 275, and the locking piston rod 242 of the locking cylinder 24 will extend outward. When the sliding valve core 273 is reset to the center, the locking piston rod 242 of the locking cylinder 24 is reset under the elastic force of its second spring 243, pushing the hydraulic oil back to the valve core chamber 275. It can be seen that the locking piston rods 242 of the two locking cylinders 24 move in opposite directions. When one extends, the other retracts, and vice versa.

[0038] After the limit assembly 27 is set, the function of the limit protrusion 311 is to limit the lateral rotation angle of the chair back 2 to half of that without the limit assembly 27. Of course, if a larger lateral rotation angle of the chair back 2 is desired, the limit protrusion 311 can be omitted.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A dental comprehensive treatment chair, comprising a headrest, a chair back and a base. The headrest is used to fix the patient's head to reduce unintentional movement of the patient's head. The headrest and the chair back are respectively mounted on the base. include: A rotation driving device connected to the head support to drive the head support to rotate laterally; Headrest locking device, which can lock or unlock the headrest; When the head support needs to be rotated, the head support locking device unlocks the head support, and the driving device drives the head support to rotate sideways. After the head support rotates sideways to the right position, the head support locking device locks the head support.

2. The dental comprehensive treatment chair according to claim 1, wherein: The head support is provided with a driven shaft, and the driving device includes a driving motor and a chimeric coupling, and the chimeric coupling includes: A slide seat, which is fixed to the rotating shaft of the driving motor; A connecting shaft is slidably connected to the slide seat so as to be slidable along the axial direction of the rotating shaft of the driving motor; a first spring, which is respectively connected to the slide seat and the connecting shaft to push the connecting shaft to maintain elastic contact with the driven shaft; The connecting shaft and the driven shaft are respectively provided with mutually engaged convex teeth, so that the connecting shaft can drive the driven shaft to rotate through the friction force between the convex teeth. In the process of driving the head support to rotate laterally by the driving motor, when the force of the driving motor to drive the head support to rotate is greater than the friction force between the convex teeth, the connecting shaft and the driven shaft slip to avoid spraining the patient's neck.

3. The dental comprehensive treatment chair according to claim 2, wherein: Also included is an active disconnect device comprising: A first oil cylinder, which is used to push the connecting shaft to slide axially; a trigger cylinder, which is used to drive the first cylinder; When the trigger oil cylinder is pressed, the trigger oil cylinder drives the first oil cylinder to push the connecting shaft, so that the connecting shaft is out of contact with the driven shaft, thereby making the driving motor unable to drive the head support.

4. The dental comprehensive treatment chair according to claim 3, wherein: The active disconnect device also includes: A booster chamber, the interior of which is filled with hydraulic oil and connected to the first oil cylinder; The boosting oil cylinder is connected to the triggering oil cylinder to be driven by the triggering oil cylinder. The boosting oil cylinder includes a boosting cylinder body and a boosting piston rod. The boosting piston rod includes a driving end with a larger end surface area and a boosting end with a smaller end surface area. The driving end is slidably connected to the boosting cylinder body, and the boosting end is slidably connected to the boosting cavity. When the trigger cylinder is driven, the trigger cylinder drives the boost cylinder, so that the boost end of the boost piston rod pushes the hydraulic oil in the boost chamber, thereby outputting relatively high-pressure hydraulic oil to push the first cylinder.

5. The dental comprehensive treatment chair according to claim 1, wherein: The chair back is rotatably connected to the base so as to be lateral rotatable. The chair back is provided with a locking hole. The dental comprehensive treatment chair further includes a chair back locking mechanism, which includes: A seat back locking pin that can be inserted into the locking hole to lock the seat back or removed from the locking hole to unlock the seat back; A rotating lever fixedly connected to the headrest to rotate laterally with the headrest; A locking cylinder connected to the seat back locking pin to drive the seat back locking pin into or out of the locking hole; The locking oil cylinder is used to drive the locking oil cylinder, including a locking cylinder body, a locking piston rod and a second spring. The locking piston rod extends into the locking cylinder body and can slide. The second spring is arranged in the locking cylinder body and connected to the locking piston rod to provide elastic force for returning the locking piston rod. There are two locking oil cylinders, which correspond to the two sides of the lateral rotation of the head support respectively; When the rotary lever rotates to one side with the headrest, the rotary lever presses the locking piston rod of the locking cylinder on the corresponding side, and the locking cylinder drives the locking cylinder, and the locking cylinder drives the seat back locking pin to exit the locking hole to unlock the seat back. After the seat back is reset to the center and the rotary lever is reset to the center with the headrest, the second spring drives the locking piston rod to reset, and the locking cylinder drives the locking cylinder, and the locking cylinder drives the seat back locking pin to insert into the locking hole, thereby re-locking the seat back.

6. The dental comprehensive treatment chair according to claim 5, wherein: The chair back is also provided with a limit slot, and the chair back locking mechanism also includes a limit component, which includes: A limit block, which can be pushed and inserted into the limit slot. Two limit blocks are provided, one corresponding to each side of the headrest's lateral rotation. After the limit block is inserted into the limit slot, it limits the angle and direction of the chair back's lateral rotation. The direction is the side of the headrest's lateral rotation corresponding to the limit block. a third spring connected to the limiting block to provide elastic force for the limiting block to exit the limiting groove; The limit valve comprises a sliding valve core, a contact block, a valve core cavity and a drive lock cavity, the two ends of the valve core cavity are respectively connected to the two drive lock oil cylinders, an oil filling port is provided between the valve core cavity and the drive lock cavity to connect the valve core cavity and the drive lock cavity, the drive lock cavity is connected to the locking oil cylinder, and the two ends of the valve core cavity are respectively provided with a unidirectional return oil channel connected to the drive lock cavity, the conduction direction of the return oil channel is from the drive lock cavity to the valve core cavity, the contact block is fixedly connected to the sliding valve core, the sliding valve core is provided in the valve core cavity and can slide toward the two ends of the valve core cavity respectively, when the sliding valve core is located in the center position of the valve core cavity, the sliding valve core blocks the oil filling port, and when the sliding valve core is located in the non-center position of the valve core cavity, the oil filling port is opened; When the rotary lever rotates sideways with the headrest, the rotary lever presses the locking piston rod of the locking oil cylinder on the corresponding side, and the locking oil cylinder pushes the sliding valve core to slide toward the side in the valve core cavity. The contact block moves toward the side with the sliding valve core to push the limiting block on the corresponding side to insert into the limiting groove. At the same time, the oil filling port is opened, and the locking oil cylinder drives the locking oil cylinder via the valve core cavity, the oil filling port and the locking cavity to unlock the seat back. After the chair back is reset and centered, the rotating lever is reset and centered along with the headrest. The locking piston rod of the locking cylinder is reset, driving the sliding valve core to slide to the center position of the valve core cavity. The contact block disengages from the limit block, and the limit block exits the limit groove. At the same time, the oil filling port is blocked. The locking cylinder drives the locking cylinder via the lock cavity, the return oil channel and the valve core cavity to re-lock the chair back.

7. The dental comprehensive treatment chair according to claim 1, wherein: The headrest locking device includes: a locking solenoid that can be controlled to extend and retract; A locking tooth groove is mounted on the headrest to rotate with the headrest, and the locking electromagnet can engage with the locking tooth groove when extended; When the head support needs to be locked, the locking electromagnet is controlled to extend to lock the head support, and when the head support needs to be rotated, the locking electromagnet is controlled to retract to unlock the head support.

Images