A lifting structure applied to a dental treatment chair

Abstract

The present invention relates to the technical field of dental chairs, and discloses a lifting structure applied to a dental treatment chair, including a base. On one side outer wall of the top of the base, two bosses are welded, and a rotating column is rotatably connected between the two bosses. A bracket is fixedly connected to the outer wall of the rotating column, and a hydraulic rod is hinged between the bracket and the base. On both sides of one side outer wall of the top of the base, two sliding grooves I are symmetrically opened, and sliding grooves II are opened at the bottoms of the two sliding grooves I. A sliding block II is slidably connected inside the sliding groove II, and a sliding block I is fixedly connected to the top of the sliding block II. When the present invention lifts the bracket, the bracket can be supported by the support plate at all times to prevent the bracket from automatically rotating due to a malfunction. Moreover, due to the support of the bracket by the support plate, when the hydraulic rod malfunctions and needs to be repaired, the hydraulic rod can be easily disassembled for repair and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of dental chairs, and particularly to a lifting structure applied to a dental treatment chair. Background Art

[0002] Dental chairs are used for oral surgeries and examinations and treatments of oral diseases. Most are electric dental chairs. Its bottom plate is fixed to the ground, and the bottom plate is connected to the upper part of the dental chair through a bracket. The movement of the dental chair is controlled by a control switch on the backrest. Its working principle is: the control switch starts the motor to run and drives the transmission mechanism to work, so that the corresponding components of the dental chair move. According to the treatment needs, by operating the control switch button, the dental chair can complete actions such as rising, falling, pitching, reclining, and resetting.

[0003] Existing brackets generally use hydraulic rods or other electric methods to rotate, so as to complete the rising and falling actions of the dental chair. When the existing dental chair rotates the bracket, if a failure occurs, it may cause the dental chair to rotate, thus affecting the treatment of patients.

[0004] In view of this, the present invention proposes a lifting structure applied to a dental treatment chair to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a lifting structure applied to a dental treatment chair.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A lifting structure applied to a dental treatment chair includes a base. On one side of the top outer wall of the base, two bosses are welded, and a rotating column is rotatably connected between the two bosses. A bracket is fixedly connected to the outer wall of the rotating column, and a hydraulic rod is hinged between the bracket and the base. On both sides of the top outer wall of the base, two sliding grooves one are symmetrically opened, and sliding grooves two are opened at the bottoms of the two sliding grooves one. A sliding block two is slidably connected inside the sliding groove two, and a sliding block one is fixedly connected to the top of the sliding block two. One side outer wall of the sliding block one is in close contact with the inner wall of the sliding groove one, and a support plate is hinged between the sliding block one and the bracket. There is a gap between the other side outer wall of the sliding block one and the inner wall of the sliding groove one, and a telescopic limiting mechanism is provided on this side outer wall. Installation cavities are provided on one side of each of the sliding grooves one, and a plurality of through ports are equidistantly opened between the installation cavity and the sliding groove one. Limiting plates one are provided in the through ports, and rotating mechanisms are provided at the ends of the limiting plates one away from the sliding grooves one. A driving mechanism is provided on one side of each of the plurality of rotating mechanisms.

[0008] Further, the rotating mechanism includes a rotating shaft, the rotating shafts are all rotatably connected in the installation cavity, and fixing cylinders are fixedly connected to the outer walls of the rotating shafts. The first limiting plates are all fixedly connected to the outer walls of the corresponding fixing cylinders, and a plurality of gear teeth are equidistantly arranged on the outer wall of the fixing cylinder away from the first limiting plate.

[0009] Further, the driving mechanism includes a first electric push rod, the first electric push rod is embedded in the outer wall of one side of the base, and a moving plate is fixedly connected to the telescopic end of the first electric push rod. Slide rods are slidably connected to one side of the installation cavity, one end of the slide rod is fixedly connected to the moving plate, and a rack is fixedly connected to the other end of the slide rod. The rack meshes with the gear teeth on the fixing cylinder.

[0010] Further, a third sliding groove is formed on the inner wall of the installation cavity, and a third sliding block is slidably connected in the third sliding groove. The rack is fixedly connected to the outer wall of the third sliding block.

[0011] Further, the telescopic limiting mechanism includes a receiving cavity, a telescopic column is slidably connected to the outer wall of the receiving cavity close to the first limiting plate, and one end of the telescopic column close to the first limiting plate is hemispherical. A second limiting plate is fixedly connected to the other end of the telescopic column, and a connecting spring is fixedly connected between the second limiting plate and the receiving cavity.

[0012] Further, circular cavities are arranged on both sides of the first sliding groove, and inclined openings are arranged above the two circular cavities. Winding columns are rotatably connected in the two circular cavities through torsion springs.

[0013] Further, a dust-proof belt is arranged on the top outer wall of the first sliding groove, and both ends of the dust-proof belt are wound around the corresponding winding columns. An installation opening is formed in the top of the dust-proof belt, and the outer wall of the first sliding block is fixedly connected to the inner wall of the corresponding installation opening.

[0014] Further, L-shaped plates are arranged on both sides of the dust-proof belt, and the L-shaped plates are fixedly connected to the base. A plurality of pressing balls are equidistantly arranged on the inner wall of the top of the L-shaped plate, and the bottom of the pressing ball contacts the surface of the dust-proof belt.

[0015] Further, a limiting gear is fixedly connected to one end of the rotating column, and a third electric push rod is arranged below the limiting gear. The third electric push rod is in a horizontal state, and an electric push rod is fixedly connected to the telescopic end of the third electric push rod. The second electric push rod is in a vertical state, and a limiting rack is fixedly connected to the telescopic end of the second electric push rod. The limiting rack can mesh with the limiting gear.

[0016] The beneficial effects of the present invention are:

[0017] When the present invention raises and lowers the bracket, the support plate can continuously support the bracket to prevent the bracket from automatically rotating due to a failure. Moreover, due to the support of the bracket by the support plate, when the hydraulic rod fails and needs to be repaired, it is convenient to disassemble the hydraulic rod for repair and maintenance.

[0018] The dust-proof belt can prevent dust from entering the first sliding groove and the second sliding groove, avoiding the situation where garbage and impurities fall into the first sliding groove and the second sliding groove and are difficult to clean. Moreover, the dust-proof belt can move synchronously with the first sliding block without hindering its movement.

[0019] By setting the limit gear and the limit rack, the rotation angle of the bracket can be restricted, preventing the bracket from rotating excessively and damaging obstacles and components inside the dental chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 12 is a schematic structural diagram of a lifting structure applied to a dental chair according to Embodiment 1;

[0021] Figure 2 FIG. 16 is a schematic side view structure diagram of the base of a lifting structure applied to a dental chair according to Embodiment 1;

[0022] Figure 3 FIG. 20 is a partially sectional structural diagram of the base of a lifting structure applied to a dental chair according to Embodiment 1;

[0023] Figure 4 FIG. 24 is a sectional structural diagram of the first sliding block of a lifting structure applied to a dental chair according to Embodiment 1;

[0024] Figure 5 FIG. 28 is a partial structural diagram of a lifting structure applied to a dental chair according to Embodiment 2;

[0025] Figure 6 FIG. 32 is a partially sectional structural diagram of the base of a lifting structure applied to a dental chair according to Embodiment 2;

[0026] Figure 7 FIG. 36 is a schematic structural diagram of the L-shaped plate of a lifting structure applied to a dental chair according to Embodiment 2;

[0027] Figure 8 FIG. 40 is a front view structural diagram of a lifting structure applied to a dental chair according to Embodiment 3.

[0028] In the figure: 1, base; 2, boss; 3, support plate; 4, hydraulic rod; 5, bracket; 6, rotating column; 7, sliding groove one; 8, sliding groove two; 9, sliding block one; 10, sliding block two; 11, limiting plate one; 12, fixed cylinder; 13, installation cavity; 14, sliding rod; 15, electric push rod one; 16, moving plate; 17, rack; 18, sliding groove three; 19, sliding block three; 20, rotating shaft; 21, gear teeth; 22, through port; 23, connecting spring; 24, telescopic column; 25, limiting plate two; 26, accommodating cavity; 27, dust-proof belt; 28, L-shaped plate; 29, installation port; 30, circular cavity; 31, winding column; 32, inclined port; 33, pressing ball; 34, limiting gear; 35, limiting rack; 36, electric push rod two; 37, electric push rod three. Detailed implementation mode

[0029] The technical solution of the present invention will be further described in detail below in conjunction with the detailed implementation mode.

[0030] Example 1, refer to Figures 1 - 4, A lifting structure applied to a dental treatment chair, including a base 1. On one side of the outer wall of the top of the base 1, two bosses 2 are welded. A rotating column 6 is rotatably connected between the two bosses 2. A bracket 5 is fixedly connected to the outer wall of the rotating column 6. A hydraulic rod 4 is hinged between the bracket 5 and the base 1. On both sides of the outer wall of the top of the base 1, two first sliding grooves 7 are symmetrically opened. At the bottom of each of the two first sliding grooves 7, a second sliding groove 8 is opened. A second sliding block 10 is slidably connected inside the second sliding groove 8. A first sliding block 9 is fixedly connected to the top of the second sliding block 10. One side outer wall of the first sliding block 9 is in close contact with the inner wall of the first sliding groove 7. A support plate 3 is hinged between the first sliding block 9 and the bracket 5. There is a gap between the other side outer wall of the first sliding block 9 and the inner wall of the first sliding groove 7. An expansion and limit mechanism is arranged on this side outer wall. On one side of each of the first sliding grooves 7, an installation cavity 13 is arranged. A plurality of through openings 22 are equidistantly opened between the installation cavity 13 and the first sliding groove 7. A first limiting plate 11 is arranged in each of the through openings 22. One end of the first limiting plate 11 away from the first sliding groove 7 is provided with a rotating mechanism. A driving mechanism is arranged on one side of the plurality of rotating mechanisms. When the hydraulic rod 4 rotates the bracket 5 to raise the dental chair, the driving mechanism will be started synchronously. The driving mechanism operates the plurality of rotating mechanisms, so that the first limiting plates 11 in each of the through openings 22 deflect, making one end of each first limiting plate 11 close to the first sliding block 9 deflect towards the boss 2. When the bracket 5 rotates to raise the dental chair, the first sliding block 9 can be moved in the first sliding groove 7 through the support plate 3. At this time, the distance between the first sliding block 9 and the boss 2 is shortened. If the bracket 5 rotates to lower the dental chair, the first limiting plates 11 also rotate. At this time, the rotating direction of the first limiting plates 11 is opposite to that before, making one end of each first limiting plate 11 close to the first sliding block 9 move away from the boss. At this time, the first sliding block 9 moves away from the boss 2. During the movement of the first sliding block 9, the expansion and limit mechanism on the first sliding block 9 will contact the inclined surface of the first limiting plate 11. Under the action of the extrusion force, the expansion and limit mechanism will retract into the first sliding block 9, so as not to hinder the movement of the first sliding block 9. When the expansion and limit mechanism separates from the inclined surface of the first limiting plate 11, the expansion and limit mechanism will reset. If the lifting of the dental chair is fixed at this time, the inclined first limiting plate 11 will cooperate with the reset expansion and limit mechanism to prevent the first sliding block 9 from retracting, so that the bracket 5 can be continuously supported through the support plate 3 to prevent the bracket 5 from automatically rotating due to a malfunction. And through the support of the support plate 3 for the bracket 5, when the hydraulic rod 4 fails and needs to be repaired, it is convenient to disassemble the hydraulic rod 4 for repair and maintenance.

[0031] As a further solution in the present invention, the rotating mechanism includes a rotating shaft 20. The rotating shafts 20 are all rotatably connected in the installation cavity 13. Fixed cylinders 12 are fixedly connected to the outer walls of the rotating shafts 20. The first limiting plates 11 are all fixedly connected to the outer walls of the corresponding fixed cylinders 12. A plurality of gear teeth 21 are equidistantly arranged on the outer wall of the fixed cylinder 12 away from the first limiting plate 11.

[0032] As a further solution in the present invention, the driving mechanism includes an electric push rod 15. The electric push rod 15 is embedded in the outer wall of one side of the base 1, and the telescopic end of the electric push rod 15 is fixedly connected to a moving plate 16. Slide rods 14 are slidably connected to one side of the installation cavity 13, and one end of the slide rod 14 is fixedly connected to the moving plate 16. The other end of the slide rod 14 is fixedly connected to a rack 17. The rack 17 meshes with the teeth 21 on the fixed cylinder 12. The electric push rod 15 can make the moving plate 16 approach or move away from the base 1, so that the rack 17 in the installation cavity 13 can be moved through the slide rod 14. Also, because the rack 17 meshes with the teeth 21 on the fixed cylinder 12, when the rack 17 moves, the rotating shaft 20 can be rotated, so that each limiting plate 11 rotates synchronously.

[0033] As a further solution in the present invention, a sliding groove three 18 is formed on the inner wall of the installation cavity 13, and a sliding block three 19 is slidably connected in the sliding groove three 18. The rack 17 is fixedly connected to the outer wall of the sliding block three 19, which can support the rack 17 to prevent it from deforming and affecting the meshing effect.

[0034] As a further solution in the present invention, the telescopic limiting mechanism includes a receiving cavity 26. A telescopic column 24 is slidably connected to the outer wall of the receiving cavity 26 close to the limiting plate 11. One end of the telescopic column 24 close to the limiting plate 11 is hemispherical. The other end of the telescopic column 24 is fixedly connected to a limiting plate two 25, and a connecting spring 23 is fixedly connected between the limiting plate two 25 and the receiving cavity 26. The telescopic column 24 will contact the surface of the deflected limiting plate 11. Because the limiting plate 11 is inclined after deflection and one end of the telescopic column 24 close to the limiting plate 11 is hemispherical, when the sliding block one 9 drives the telescopic column 24 to move, the telescopic column 24 will be subjected to a squeezing force. The telescopic column 24 presses the connecting spring 23 and retracts into the receiving cavity 26. When the telescopic column 24 is separated from the surface of the limiting plate 11, the telescopic column 24 is no longer subjected to the squeezing force. Under the resilience of the connecting spring 23, the telescopic column 24 resets. If the sliding block one 9 retracts, one end of the inclined limiting plate 11 abuts against the telescopic column 24, so that the sliding block one 9 cannot move.

[0035] Working principle: When the hydraulic rod 4 rotates the bracket 5 to raise the dental chair, the electric push rod 15 can move the moving plate 16 closer to the base 1, so that the rack 17 in the installation cavity 13 can be moved through the slide rod 14. Also, because the rack 17 meshes with the teeth 21 on the fixed cylinder 12, when the rack 17 moves, the rotating shaft 20 can be rotated, so that each limit plate 11 rotates synchronously, causing the limit plate 11 in each through port 22 to deflect, and making one end of each limit plate 11 close to the sliding block 9 deflect towards the boss 2. When the bracket 5 rotates to raise the dental chair, the sliding block 9 can be moved in the sliding groove 7 through the support plate 3. At this time, the distance between the sliding block 9 and the boss 2 is shortened. If the bracket 5 rotates to lower the dental chair, the limit plates 11 also rotate. At this time, the rotation direction of the limit plate 11 is opposite to that before, making one end of each limit plate 11 close to the sliding block 9 move away from the boss. At this time, the sliding block 9 moves away from the boss 2. During the movement of the sliding block 9, the telescopic column 24 on the sliding block 9 will contact the surface of the deflected limit plate 11. Because the limit plate 11 is inclined after deflection, and one end of the telescopic column 24 close to the limit plate 11 is hemispherical, when the sliding block 9 drives the telescopic column 24 to move, the telescopic column 24 will be subjected to a squeezing force, and the telescopic column 24 will press the connecting spring 23 and retract into the accommodation cavity 26. When the telescopic column 24 separates from the surface of the limit plate 11, the telescopic column 24 is no longer subjected to the squeezing force, and under the resilience of the connecting spring 23, the telescopic column 24 resets. If the sliding block 9 retracts, one end of the inclined limit plate 11 abuts against the telescopic column 24, so that the sliding block 9 cannot move. If a failure occurs in the lifting of the dental chair at this time, the support plate 3 can continuously support the bracket 5 to prevent the bracket 5 from automatically rotating due to a failure. And through the support of the support plate 3 for the bracket 5, when the hydraulic rod 4 fails and needs to be repaired, it is convenient to disassemble the hydraulic rod 4 for repair and maintenance.

[0036] Embodiment 2, referring to Figures 1 - 7 , a lifting structure applied to a dental treatment chair. Compared with Embodiment 1, on the basis of Embodiment 1, circular cavities 30 are provided on both sides of the sliding groove 7, and inclined ports 32 are provided above the two circular cavities 30. Winding columns 31 are rotatably connected to the two circular cavities 30 through torsion springs.

[0037] As a further solution in the present invention, a dust-proof belt 27 is provided on the outer wall of the top of the first sliding groove 7, and both ends of the dust-proof belt 27 are wound around the corresponding winding columns 31. An installation opening 29 is provided at the top of the dust-proof belt 27, and the outer wall of the first sliding block 9 is fixedly connected to the inner wall of the corresponding installation opening 29. When the first sliding block 9 moves, the first sliding block 9 will drive the dust-proof belt 27 to move. Since both ends of the dust-proof belt 27 are wound around the corresponding winding columns 31, and the winding columns 31 are rotationally connected to the circular cavity 30 through torsion springs, when the first sliding block 9 moves, the dust-proof belt 27 on one of the winding columns 31 will gradually unwind, while the dust-proof belt 27 on the other winding column 31 will gradually wind, causing the dust-proof belt 27 to always be in a taut state, thereby being able to prevent dust from entering the first sliding groove 7 and the second sliding groove 8, avoiding the situation where garbage and impurities fall into the first sliding groove 7 and the second sliding groove 8 and are difficult to clean, and the dust-proof belt 27 can move synchronously with the first sliding block 9 without hindering its movement.

[0038] As a further solution in the present invention, L-shaped plates 28 are provided on both sides of the dust-proof belt 27, and the L-shaped plates 28 are fixedly connected to the base 1. A plurality of pressing balls 33 are equidistantly arranged on the inner wall of the top of the L-shaped plates 28, and the bottom of the pressing balls 33 is in contact with the surface of the dust-proof belt 27. Through the pressing balls 33, the sides of the dust-proof belt 27 can be pressed, so that its sides always closely adhere to the surface of the base 1, avoiding the appearance of gaps.

[0039] Working principle: When the first sliding block 9 moves, the first sliding block 9 will drive the dust-proof belt 27 to move. Since both ends of the dust-proof belt 27 are wound around the corresponding winding columns 31, and the winding columns 31 are rotationally connected to the circular cavity 30 through torsion springs, when the first sliding block 9 moves, the dust-proof belt 27 on one of the winding columns 31 will gradually unwind, while the dust-proof belt 27 on the other winding column 31 will gradually wind, causing the dust-proof belt 27 to always be in a taut state, thereby being able to prevent dust from entering the first sliding groove 7 and the second sliding groove 8, avoiding the situation where garbage and impurities fall into the first sliding groove 7 and the second sliding groove 8 and are difficult to clean, and the dust-proof belt 27 can move synchronously with the first sliding block 9 without hindering its movement; through the pressing balls 33, the sides of the dust-proof belt 27 can be pressed, so that its sides always closely adhere to the surface of the base 1, avoiding the appearance of gaps.

[0040] Example 3, refer to Figures 1 - 8, A lifting structure applied to a dental treatment chair. Compared with Embodiment 2, on the basis of Embodiment 2, one end of the rotating column 6 is fixedly connected with a limit gear 34, and an electric push rod three 37 is arranged below the limit gear 34. The electric push rod three 37 is in a horizontal state, and the telescopic end of the electric push rod three 37 is fixedly connected with an electric push rod two 36. The electric push rod two 36 is in a vertical state, and the telescopic end of the electric push rod two 36 is fixedly connected with a limit rack 35. The limit rack 35 can be meshed with the limit gear 34. Through the horizontal electric push rod three 37, the limit rack 35 can be moved in the horizontal direction, and through the vertical electric push rod two 36, the limit rack 35 can be moved in the vertical direction, so as to ensure that the limit rack 35 is meshed with the limit gear 34, and the rotation angle of the bracket 5 can be limited, avoiding the bracket 5 from over-rotating and damaging obstacles and components inside the dental chair.

[0041] Working principle: Through the horizontal electric push rod three 37, the limit rack 35 can be moved in the horizontal direction, and through the vertical electric push rod two 36, the limit rack 35 can be moved in the vertical direction, so as to ensure that the limit rack 35 is meshed with the limit gear 34, and the rotation angle of the bracket 5 can be limited, avoiding the bracket 5 from over-rotating and damaging obstacles and components inside the dental chair.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A lifting structure for a dental treatment chair, comprising a base (1), wherein two bosses (2) are welded to an outer wall on one side of the top of the base (1), and a rotating column (6) is rotatably connected between the two bosses (2), and a bracket (5) is fixedly connected to the outer wall of the rotating column (6), and a hydraulic rod (4) is hinged between the bracket (5) and the base (1), characterized in that: The base (1) has two symmetrically arranged sliding grooves (7) on the outer walls of both sides of the top, and the two sliding grooves (7) are each provided with sliding grooves (8) at the bottom, the sliding grooves (8) are internally slidably connected with sliding blocks (10), and the top of the sliding blocks (10) is fixedly connected with sliding blocks (9), the outer wall of one side of the sliding blocks (9) is tightly attached to the inner wall of the sliding grooves (7), and a support plate (3) is hinged between the sliding blocks (9) and the bracket (5), and the sliding blocks (9) are connected to the support plate (5), and the sliding blocks (9) are connected to the support plate (5). There is a gap between the outer wall on the other side and the inner wall of the sliding groove one (7), and a telescopic limit mechanism is arranged on the outer wall on the side, a mounting cavity (13) is arranged on one side of the sliding groove one (7), and a plurality of through openings (22) are opened at equal distances between the mounting cavity (13) and the sliding groove one (7), a limit plate one (11) is arranged in each of the through openings (22), and a rotation mechanism is arranged on one end of the limit plate one (11) away from the sliding groove one (7), and a driving mechanism is arranged on one side of each of the plurality of rotation mechanisms; The rotating mechanism comprises a rotating shaft (20), the rotating shaft (20) is rotatably connected to the installation cavity (13), and the outer wall of the rotating shaft (20) is fixedly connected to a fixed cylinder (12), the limiting plate (11) is fixedly connected to the outer wall of the corresponding fixed cylinder (12), and a plurality of gear teeth (21) are arranged at equal distances on the outer wall of the fixed cylinder (12) away from the limiting plate (11); The driving mechanism comprises an electric push rod (15), the electric push rod (15) is embedded in an outer wall of one side of the base (1), and the telescopic end of the electric push rod (15) is fixedly connected to a movable plate (16), one side of the installation cavity (13) is slidably connected to a slide rod (14), one end of the slide rod (14) is fixedly connected to the movable plate (16), and the other end of the slide rod (14) is fixedly connected to a rack (17), and the rack (17) is meshed with a gear tooth (21) on the fixed cylinder (12); A sliding groove three (18) is provided on the inner wall of the installation cavity (13), and a sliding block three (19) is slidably connected in the sliding groove three (18), and the rack (17) is fixedly connected to the outer wall of the sliding block three (19); The telescopic limit mechanism comprises a housing cavity (26), a telescopic column (24) being slidably connected to an outer wall of the housing cavity (26) close to the limit plate 1 (11), and one end of the telescopic column (24) close to the limit plate 1 (11) is hemispherical, the other end of the telescopic column (24) is fixedly connected to the limit plate 2 (25), and a connecting spring (23) is fixedly connected between the limit plate 2 (25) and the housing cavity (26).

2. The lifting structure for a dental treatment chair according to claim 1, characterized in that: Circular cavities (30) are provided on both sides of the first sliding groove (7), and oblique openings (32) are provided above the two circular cavities (30). The interiors of the two circular cavities (30) are rotatably connected to winding columns (31) via torsion springs.

3. The lifting structure for a dental treatment chair according to claim 2, characterized in that: A dustproof belt (27) is provided on the top outer wall of the slide groove (7), and both ends of the dustproof belt (27) are wound around corresponding winding columns (31). A mounting opening (29) is provided on the top of the dustproof belt (27), and the outer wall of the slide block (9) is fixedly connected to the inner wall of the corresponding mounting opening (29).

4. The lifting structure for a dental treatment chair according to claim 3, characterized in that: The dustproof belt (27) is provided with an L-shaped plate (28) on each side, and the L-shaped plate (28) is fixedly connected to the base (1); a plurality of pressing balls (33) are provided at equal distances on the inner wall of the top of the L-shaped plate (28), and the bottom of the pressing balls (33) is in contact with the surface of the dustproof belt (27).

5. The lifting structure for a dental treatment chair according to claim 1, characterized in that: One end of the rotating column (6) is fixedly connected to a limit gear (34), and an electric push rod three (37) is arranged below the limit gear (34), the electric push rod three (37) is in a horizontal state, and the telescopic end of the electric push rod three (37) is fixedly connected to the electric push rod two (36), the electric push rod two (36) is in a vertical state, and the telescopic end of the electric push rod two (36) is fixedly connected to the limit rack (35), and the limit rack (35) can mesh with the limit gear (34).

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