Lifting structure applied to dental treatment chair

Abstract

The invention relates to the technical field of dental chairs, and discloses a lifting structure applied to a dental treatment chair, the lifting structure comprises a base, two bosses are welded to the outer wall of one side of the top of the base, a rotating column is rotatably connected between the two bosses, a support is fixedly connected to the outer wall of the rotating column, and a hydraulic rod is hinged between the support and the base; two first sliding grooves are symmetrically formed in the outer walls of the two sides of the top of the base, second sliding grooves are formed in the bottoms of the two first sliding grooves, second sliding blocks are slidably connected into the second sliding grooves, and first sliding blocks are fixedly connected to the tops of the second sliding blocks. When the support is lifted, the support can be constantly supported through the supporting plate, the situation that the support automatically rotates due to faults is prevented, the support is supported through the supporting plate, and when a hydraulic rod breaks down and needs to be repaired, the hydraulic rod can be conveniently detached, and repair and maintenance are facilitated.

Description

Technical Field

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

[0002] Dental chairs are used for oral surgery and examination and treatment of oral diseases. Most dental chairs are electric. The bottom plate is fixed to the ground and connected to the upper part of the dental chair through a bracket. The movement of the dental chair is controlled by the control switch on the back of the chair. Its working principle is: the control switch starts the motor to drive the transmission mechanism to move the corresponding parts of the dental chair. According to the treatment needs, the control switch button is operated, and the dental chair can complete the actions of rising, falling, tilting, supine and resetting.

[0003] The existing bracket generally adopts hydraulic rod or other electric means to rotate, so as to complete the rising and falling actions of the dental chair. However, if a malfunction occurs when the bracket of the existing dental chair rotates, it may cause the dental chair to rotate, thereby affecting the patient's treatment.

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

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a lifting structure for a dental treatment chair.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A lifting structure for a dental treatment chair comprises a base, two bosses are welded to an outer wall on one side of the top of the base, 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, two sliding grooves 1 are symmetrically arranged on the outer walls on both sides of the top of the base, and a sliding groove 2 is arranged at the bottom of the two sliding grooves 1, a sliding block 2 is slidably connected inside the sliding groove 2, and a sliding block 1 is fixedly connected to the top of the sliding block 2, and the sliding The outer wall of one side of the block is in close contact with the inner wall of the sliding groove, and a support plate is hinged between the sliding block and the bracket, there is a gap between the outer wall of the other side of the sliding block and the inner wall of the sliding groove, and a telescopic limiting mechanism is arranged on the outer wall of this side, an installation cavity is arranged on one side of the sliding groove, and a plurality of through openings are opened between the installation cavity and the sliding groove at equal distances, a limiting plate is arranged in each of the through openings, and a rotating mechanism is arranged on one end of the limiting plate away from the sliding groove, and a driving mechanism is arranged on one side of the plurality of rotating mechanisms.

[0007] Furthermore, the rotating mechanism includes a rotating shaft, which is rotatably connected in the installation cavity, and the outer wall of the rotating shaft is fixedly connected with a fixed cylinder, the limiting plate 1 is fixedly connected to the outer wall of the corresponding fixed cylinder, and a plurality of gear teeth are equidistantly arranged on the outer wall of the fixed cylinder away from the limiting plate 1.

[0008] Furthermore, the driving mechanism includes an electric push rod, which is embedded in an outer wall of one side of the base, and a telescopic end of the electric push rod is fixedly connected to a movable plate, a sliding rod is slidably connected to one side of the mounting cavity, and one end of the sliding rod is fixedly connected to the movable plate, and the other end of the sliding rod is fixedly connected to a rack, and the rack is meshed with the gear teeth on the fixed cylinder.

[0009] Furthermore, a sliding groove three is provided on the inner wall of the installation cavity, and a sliding block three is slidably connected in the sliding groove three, and the rack is fixedly connected to the outer wall of the sliding block three.

[0010] Furthermore, the telescopic limit mechanism includes a accommodating cavity, a telescopic column is slidably connected to the outer wall of the accommodating cavity close to the limit plate one, and one end of the telescopic column close to the limit plate one is hemispherical, the other end of the telescopic column is fixedly connected to the limit plate two, and a connecting spring is fixedly connected between the limit plate two and the accommodating cavity.

[0011] Furthermore, circular cavities are provided on both sides of the sliding groove, and oblique openings are provided above the two circular cavities. The interiors of the two circular cavities are rotatably connected with winding columns through torsion springs.

[0012] Furthermore, a dustproof belt is arranged on the top outer wall of the sliding groove, and both ends of the dustproof belt are wound around corresponding winding columns. A mounting opening is opened on the top of the dustproof belt, and the outer wall of the sliding block is fixedly connected to the corresponding inner wall of the mounting opening.

[0013] Furthermore, L-shaped plates are provided on the sides of the dustproof belt, and the L-shaped plates are fixedly connected to the base. A plurality of pressing balls are provided at equal distances on the inner wall of the top of the L-shaped plate, and the bottom of the pressing balls contacts the surface of the dustproof belt.

[0014] Furthermore, one end of the rotating column is fixedly connected to a limiting gear, and an electric push rod three is arranged below the limiting gear, the electric push rod three is in a horizontal state, and the telescopic end of the electric push rod three is fixedly connected to an electric push rod two, the electric push rod two is in a vertical state, and the telescopic end of the electric push rod two is fixedly connected to a limiting rack, and the limiting rack can engage with the limiting gear.

[0015] The beneficial effects of the present invention are: When the bracket is raised or lowered, the support plate can continuously support the bracket to prevent the bracket from automatically rotating due to a malfunction. In addition, the support of the bracket by the support plate allows the hydraulic rod to be easily disassembled when a malfunction occurs and requires repair, thereby facilitating repair and maintenance.

[0016] The dustproof belt can be used to prevent dust from falling into the sliding grooves one and two, thereby preventing garbage and impurities from falling into the sliding grooves one and two and becoming difficult to clean. In addition, the dustproof belt can move synchronously with the sliding block one without hindering its movement.

[0017] By setting a limit gear and a limit rack, the rotation angle of the bracket can be limited to prevent the bracket from excessively rotating and damaging obstacles and parts inside the dental chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a lifting structure applied to a dental treatment chair proposed in Example 1; Figure 2 This is a schematic diagram of a side view of a base structure of a lifting structure applied to a dental treatment chair proposed in Example 1; Figure 3 This is a schematic cross-sectional structural diagram of a base portion of a lifting structure applied to a dental treatment chair proposed in Example 1; Figure 4 This is a schematic cross-sectional structure diagram of a sliding block of a lifting structure applied to a dental treatment chair proposed in Example 1; Figure 5 This is a partial structural schematic diagram of a lifting structure applied to a dental treatment chair proposed in Example 2; Figure 6 This is a schematic cross-sectional structure diagram of a base portion of a lifting structure applied to a dental treatment chair proposed in Example 2; Figure 7 This is a schematic diagram of an L-shaped plate structure applied to a lifting structure of a dental treatment chair proposed in Example 2; Figure 8 This is a front view structural schematic diagram of a lifting structure applied to a dental treatment chair proposed in Example 3.

[0019] In the figure: 1. base; 2. boss; 3. support plate; 4. hydraulic rod; 5. bracket; 6. rotating column; 7. sliding groove 1; 8. sliding groove 2; 9. sliding block 1; 10. sliding block 2; 11. limiting plate 1; 12. fixing cylinder; 13. installation cavity; 14. sliding rod; 15. electric push rod 1; 16. moving plate; 17. rack; 18. sliding groove 3; 19. sliding block 3; 20. rotating shaft; 21. gear; 22. through port; 23. connecting spring; 24. telescopic column; 25. limiting plate 2; 26. accommodating cavity; 27. dustproof belt; 28. L-shaped plate; 29. ​​installation port; 30. round cavity; 31. winding column; 32. oblique port; 33. pressing ball; 34. limiting gear; 35. limiting rack; 36. electric push rod 2; 37. electric push rod 3. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0021] Example 1, reference Figure 1-Figure 4A lifting structure for a dental treatment chair comprises a base 1, two bosses 2 are welded on the outer wall of one side of the top of the base 1, and 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, and a hydraulic rod 4 is hinged between the bracket 5 and the base 1, two sliding grooves 7 are symmetrically provided on the outer walls of both sides of the top of the base 1, and a sliding groove 2 8 is provided at the bottom of the two sliding grooves 7, a sliding block 2 10 is slidably connected inside the sliding groove 2 8, and a sliding block 1 9 is fixedly connected to the top of the sliding block 10, an outer wall of one side of the sliding block 9 is tightly attached to the inner wall of the sliding groove 7, and a support plate is hinged between the sliding block 19 and the bracket 5. 3, there is a gap between the outer wall of the other side of the sliding block 9 and the inner wall of the sliding groove 7, and a telescopic limit mechanism is arranged on the outer wall of the side, a mounting cavity 13 is arranged on one side of the sliding groove 7, and a plurality of through openings 22 are opened at equal distances between the mounting cavity 13 and the sliding groove 7, a limit plate 11 is arranged in the through opening 22, and a rotation mechanism is arranged at one end of the limit plate 11 away from the sliding groove 7, and a driving mechanism is arranged on one side of the plurality of rotation mechanisms. When the bracket 5 rotates when the hydraulic rod 4 makes the dental chair rise, the driving mechanism will be started synchronously, and the driving mechanism makes the plurality of rotation mechanisms run, so that the limit plates 11 in each through opening 22 are deflected, so that each limit plate 11 is The ends of the positioning plates 11 close to the sliding blocks 9 are all biased toward the boss 2. When the bracket 5 rotates to make the dental chair rise, the sliding blocks 9 can be moved in the sliding grooves 7 through the support plates 3. At this time, the distance between the sliding blocks 9 and the boss 2 is shortened. If the bracket 5 rotates to make the dental chair descend, each limiting plate 11 is also rotated. At this time, the direction of rotation of the limiting plates 11 is opposite to that before, so that the ends of each limiting plate 11 close to the sliding blocks 9 are all away from the boss. At this time, the sliding blocks 9 are away from the boss 2. In the process of the sliding blocks 9 moving, the telescopic limiting mechanism on the sliding blocks 9 will contact with the inclined surface of the limiting plates 11. Under the action, the telescopic limit mechanism will retract into the sliding block 9, so as not to hinder the movement of the sliding block 9. When the telescopic limit mechanism is separated from the surface of the inclined limit plate 11, the telescopic limit mechanism will be reset. If the lifting of the dental chair is fixed at this time, the inclined limit plate 11 will cooperate with the reset telescopic limit mechanism to prevent the sliding block 9 from retreating. Therefore, the bracket 5 can be continuously supported by the support plate 3 to prevent the bracket 5 from automatically rotating due to a fault. In addition, through the support of the support plate 3 to the bracket 5, when the hydraulic rod 4 fails and needs to be repaired, the hydraulic rod 4 can be easily disassembled for easy repair and maintenance.

[0022] As a further solution in the present invention, the rotating mechanism includes a rotating shaft 20, which is rotatably connected to the installation cavity 13, and the outer wall of the rotating shaft 20 is fixedly connected to the fixed cylinder 12, the limiting plate 11 is fixedly connected to the corresponding outer wall of the fixed cylinder 12, and a plurality of gear teeth 21 are equidistantly arranged on the outer wall of the fixed cylinder 12 away from the limiting plate 11.

[0023] As a further solution in the present invention, the driving mechanism includes an electric push rod 15, which 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, and a sliding rod 14 is slidably connected to one side of the installation cavity 13, and one end of the sliding rod 14 is fixedly connected to the moving plate 16, and the other end of the sliding rod 14 is fixedly connected to a rack 17, and the rack 17 is meshed with the gear 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 sliding rod 14, and because the rack 17 is meshed with the gear teeth 21 on the fixed cylinder 12, when the rack 17 moves, the rotating shaft 20 can rotate, so that the limit plates 11 rotate synchronously.

[0024] As a further solution in the present invention, a sliding groove three 18 is opened 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 and prevent it from deforming and affecting the meshing effect.

[0025] As a further solution in the present invention, the telescopic limit mechanism includes a housing chamber 26, and a telescopic column 24 is slidably connected to the outer wall of the housing chamber 26 near the limit plate 11, and the end of the telescopic column 24 near the limit plate 11 is hemispherical, and the other end of the telescopic column 24 is fixedly connected to the limit plate 25, and a connecting spring 23 is fixedly connected between the limit plate 25 and the housing chamber 26, and the telescopic column 24 will contact the surface of the limit plate 11 after deflection. Because the limit plate 11 is tilted after deflection, and the telescopic column 2 The end close to the limit plate 11 is hemispherical, so when the slide block 9 moves with the telescopic column 24, the telescopic column 24 will be squeezed, and the telescopic column 24 presses the connecting spring 23 to retract into the accommodating cavity 26. When the telescopic column 24 is separated from the surface of the limit plate 11, the telescopic column 24 is no longer squeezed, and the telescopic column 24 is reset under the action of the rebound force of the connecting spring 23. If the slide block 9 retreats, one end of the inclined limit plate 11 abuts against the telescopic column 24, so that the slide block 9 cannot move.

[0026] Working principle: When the hydraulic rod 4 rotates the bracket 5 to make the dental chair rise, the electric push rod 15 can make the moving plate 16 close to the base 1, so that the rack 17 in the installation cavity 13 can be moved through the sliding rod 14. Because the rack 17 is meshed with the gear 21 on the fixed cylinder 12, when the rack 17 moves, the rotating shaft 20 can be rotated, so that the limit plates 11 in each opening 22 are deflected, and each limit plate 11 is close to the sliding plate 11. One end of the block 9 is biased toward the boss 2, and when the bracket 5 rotates to make the dental chair rise, 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 make the dental chair descend, each limit plate 11 is also rotated. At this time, the direction of rotation of the limit plate 11 is opposite to that before, so that the end of each limit plate 11 close to the sliding block 9 is away from the boss. At this time, the sliding block 9 is away from the boss 2, and when the sliding block 9 moves During the process, the telescopic column 24 on the sliding block 9 will contact the surface of the limit plate 11 after deflection. Because the limit plate 11 is inclined after deflection, and the end of the telescopic column 24 close to the limit plate 11 is hemispherical, when the sliding block 9 moves with the telescopic column 24, the telescopic column 24 will be squeezed, and the telescopic column 24 presses the connecting spring 23 to retract into the accommodating cavity 26. When the telescopic column 24 is separated from the surface of the limit plate 11, the telescopic column 24 is no longer squeezed, and the connecting spring 23 is pressed. Under the action of the rebound force, the telescopic column 24 is reset. If the sliding block 9 retreats, one end of the inclined limit plate 11 abuts against the telescopic column 24, so that the sliding block 9 cannot move. If the lifting of the dental chair fails 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. In addition, through the support of the support plate 3 to the bracket 5, when the hydraulic rod 4 fails and needs to be repaired, the hydraulic rod 4 can be easily disassembled for easy repair and maintenance.

[0027] Example 2, reference Figure 1-Figure 7 , a lifting structure applied to a dental treatment chair. Compared with Example 1, on the basis of Example 1, circular cavities 30 are provided on both sides of a sliding groove 7, and oblique openings 32 are provided above the two circular cavities 30, and winding columns 31 are rotatably connected inside the two circular cavities 30 through torsion springs.

[0028] As a further solution of the present invention, a dustproof belt 27 is arranged on the outer wall of the top of the slide groove 7, and both ends of the dustproof belt 27 are wound around the corresponding winding column 31, and a mounting opening 29 is opened 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. When the slide block 9 moves, the slide block 9 will move with the dustproof belt 27, because both ends of the dustproof belt 27 are wound around the corresponding winding column 31, and the winding column 31 is connected to the rotation of the torsion spring. It is connected to the circular cavity 30, so that when the sliding block 9 moves, the dust-proof belt 27 on one of the winding columns 31 is gradually loosened, and the dust-proof belt 27 on the other winding column 31 is gradually wound, so that the dust-proof belt 27 is always in a taut state, so that the sliding groove 1 7 and the sliding groove 2 8 can be dust-proof, avoiding the situation that garbage and impurities fall into the sliding groove 1 7 and the sliding groove 2 8 and are difficult to clean, and the dust-proof belt 27 can move synchronously with the sliding block 9 without hindering its movement.

[0029] As a further solution in the present invention, L-shaped plates 28 are provided on the sides of the dustproof belt 27, and the L-shaped plates 28 are 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. By pressing the balls 33, the sides of the dustproof belt 27 can be pressed so that the sides are always close to the surface of the base 1 to avoid gaps.

[0030] Working principle: When the sliding block 9 moves, the sliding block 9 will move with the dustproof belt 27, because both ends of the dustproof belt 27 are wound around the corresponding winding posts 31, and the winding posts 31 are rotatably connected to the circular cavity 30 through the torsion spring. Therefore, when the sliding block 9 moves, the dustproof belt 27 on one of the winding posts 31 gradually loosens, while the dustproof belt 27 on the other winding post 31 gradually winds, so that the dustproof belt 27 is always in a taut state, so that the sliding groove 1 7 and the sliding groove 2 8 can be dustproof, avoiding the situation where garbage and impurities fall into the sliding groove 1 7 and the sliding groove 2 8 and are difficult to clean, and the dustproof belt 27 can move synchronously with the sliding block 9 without hindering its movement; by pressing the ball 33, the side of the dustproof belt 27 can be pressed, so that its side is always close to the surface of the base 1 to avoid gaps.

[0031] Example 3, reference Figure 1-Figure 8, a lifting structure applied to a dental treatment chair, compared with Example 2, on the basis of Example 2, one end of a rotating column 6 is fixedly connected to a limit gear 34, and an electric push rod 3 37 is arranged below the limit gear 34, the electric push rod 3 37 is in a horizontal state, and the telescopic end of the electric push rod 3 37 is fixedly connected to an electric push rod 2 36, the electric push rod 2 36 is in a vertical state, and the telescopic end of the electric push rod 2 36 is fixedly connected to a limit rack 35, the limit rack 35 can be engaged with the limit gear 34, the limit rack 35 can be moved in the horizontal direction by the horizontal electric push rod 37, and the limit rack 35 can be moved in the vertical direction by the vertical electric push rod 2 36, thereby ensuring that the limit rack 35 is engaged with the limit gear 34, and the rotation angle of the bracket 5 can be limited to prevent the bracket 5 from excessively rotating and damaging obstacles and parts inside the dental chair.

[0032] 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, thereby ensuring that the limit rack 35 is engaged with the limit gear 34, which can limit the rotation angle of the bracket 5 and prevent the bracket 5 from excessively rotating to damage obstacles and parts inside the dental chair.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which 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 this 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.

2. The lifting structure for a dental treatment chair according to claim 1, characterized in that: 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).

3. The lifting structure for a dental treatment chair according to claim 2, characterized in that: 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).

4. The lifting structure for a dental treatment chair according to claim 3, characterized in that: 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).

5. The lifting structure for a dental treatment chair according to claim 4, characterized in that: 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).

6. 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.

7. The lifting structure for a dental treatment chair according to claim 6, 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).

8. The lifting structure for a dental treatment chair according to claim 7, 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).

9. 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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