Oral expansion device for oral examination

Abstract

The present invention relates to the technical field of oral expansion devices for oral examinations, and discloses an oral expansion device for oral examinations, comprising a device base, a plurality of support columns fixedly connected to the upper portion of the device base, an expansion auxiliary frame fixedly connected to the upper portion of the support columns, and a fixed rod fixedly connected to the side wall of the expansion auxiliary frame. The present invention provides a rotating mechanism, and when the output ends of the first servo motor and the second servo motor rotate to drive the output shaft to rotate, the output shaft drives the gear teeth to rotate. Since the gear teeth are engaged with the arc-shaped rack, the rotation of the gear teeth drives the output shaft to slide outward along the limiting groove, and the output shaft slides outward along the limiting groove, driving the pulling expansion mechanism to slide outward. This arrangement is conducive to moving the pulling expansion mechanism away from the direction directly facing the patient's oral cavity, expanding the space for the doctor to examine the patient's oral cavity, and facilitating the doctor to examine the patient's oral cavity more intuitively, thereby avoiding the phenomenon of insufficient examination due to the doctor's obstructed line of sight.

Description

Technical Field

[0001] The present invention relates to the technical field of oral cavity expansion and stenting devices for oral cavity examination, and in particular to an oral cavity expansion and stenting device for oral cavity examination. Background Art

[0002] Stomatology, a medical discipline, primarily treats oral diseases including oral and maxillofacial dermoids, submandibular space infections, maxillofacial lymphangiomas, odontoid malformations, maxillary sinus malignancies, mandibular ameloblastomas, chronic ethmoid sinusitis, mandibular retrognathia, tetracycline-induced gingivitis, and leukoplakia of the tongue. Treatment of these conditions requires a detailed oral examination and the development of a comprehensive, effective treatment plan.

[0003] Most of the oral expansion devices in the existing technology are handheld devices. Such oral expansion devices generally expand the patient's upper and lower jaws through two upper and lower squeezing plates. When the patient's upper and lower jaws are expanded, the patient's mouth opens, but the patient's lips are not fully opened due to the opening of the patient's upper and lower jaws. The patient's lips may obstruct the doctor's inspection line of sight. Therefore, the doctor needs to open the patient's lips when performing an oral examination on the patient. Summary of the Invention

[0004] The object of the present invention is to provide an oral cavity expansion device for oral examination to solve the problems raised in the above background technology.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is an oral expansion device for oral examination, comprising a device base, a plurality of support columns fixedly connected directly above the device base, an expansion auxiliary frame fixedly connected directly above the support columns, a fixed rod fixedly connected to the side wall of the expansion auxiliary frame, a sliding groove formed at one end of the fixed rod away from the expansion auxiliary frame, a first servo motor slidably connected to the interior of the sliding groove, a second servo motor slidably connected to the interior of the sliding groove, the first servo motor and the second servo motor rotating synchronously, and further comprising:

[0007] The pulling and expanding mechanism includes an output shaft fixedly connected to the output end of the first servo motor, an end of the output shaft away from the first servo motor is fixedly connected to a screw rod, and an end of the screw rod away from the output shaft is rotatably connected to a movable sleeve.

[0008] Furthermore, the pulling and expanding mechanism also includes several linkage rods rotatably connected to the movable sleeve, the end of the linkage rod away from the movable sleeve is rotatably connected to the expansion rod, the end of the expansion rod away from the linkage rod is fixedly connected to the sliding block, and the end of the sliding block away from the expansion rod is slidably connected to the arc groove.

[0009] Furthermore, a supporting mechanism is provided on the side of the arc groove away from the sliding block, and the supporting mechanism includes an upper supporting box fixedly connected to the end of the arc groove away from the sliding block, the bottom of the upper supporting box is rotatably connected to a rotating column, and the rotating column is rotatably connected to a lower supporting box, and the upper supporting box is rotatably connected to the lower supporting box through the rotating column.

[0010] Furthermore, a rotating mechanism is provided directly above the expansion auxiliary frame, and the rotating mechanism includes a limiting groove opened on the expansion auxiliary frame, the output shaft slides inside the limiting groove, and the end of the output shaft close to the first servo motor is provided with gear teeth, and the end of the expansion auxiliary frame away from the limiting groove is fixedly connected to an arc-shaped rack, and the gear teeth are engaged with the arc-shaped rack.

[0011] Furthermore, a transverse expansion mechanism is provided on the side wall of the expansion rod, and the transverse expansion mechanism includes a connecting block fixedly connected to the side wall of the expansion rod, and an arc-shaped bidirectional telescopic rod is fixedly connected to the bottom of the connecting block.

[0012] Furthermore, the lateral expansion mechanism also includes a sliding ring slidably connected to the middle of the arc-shaped bidirectional telescopic rod, the arc-shaped bidirectional telescopic rod is sleeved with an extrusion spring, and the end of the sliding ring away from the arc-shaped bidirectional telescopic rod is fixedly connected to a supporting arc plate.

[0013] Furthermore, an expansion protection mechanism is provided inside the upper support box, which includes a sliding plate slidably connected to the inner cavity of the upper support box, a fixed plate fixedly connected directly above the upper support box, and a protective airbag fixedly connected directly above the fixed plate.

[0014] Furthermore, the expansion protection mechanism also includes a plurality of return springs fixedly connected to the side of the sliding plate away from the fixed plate, and a plurality of ventilation hoses are fixedly connected to the bottom of the upper support box. The end of the ventilation hose away from the upper support box is fixedly connected to the protective airbag, and the protective airbag is connected to the inner cavity of the upper support box through the ventilation hose.

[0015] The present invention has the following beneficial effects:

[0016] (1) The present invention sets a transverse expansion mechanism. When the output shaft drives the gear teeth to rotate, the gear teeth are engaged with the arc-shaped rack. The rotation of the gear teeth will drive the output shaft to slide outward along the limit groove. The output shaft slides outward along the limit groove, driving the sliding block on the expansion rod to slide outward along the arc groove. The expansion rod drives the sliding ring on the connecting block to move outward. The outward movement of the sliding ring drives the supporting arc plate to move outward. The outward movement of the supporting arc plate drives the corners of the mouth to open to both sides. This arrangement is conducive to opening the patient's lips and preventing the patient's lips from blocking the inside of the patient's mouth. Since the sliding ring slides on the arc-shaped two-way telescopic rod, the supporting arc plate on the sliding ring can slide up and down along the arc-shaped two-way telescopic rod. This arrangement is conducive to the supporting arc plate in the device to fit the corners of the patient's mouth better.

[0017] (2) According to the present invention, when using the oral expansion device, the patient who needs to have his oral cavity examined will first place the support mechanism inside his oral cavity, and at the same time, the left and right supporting arc plates will clamp the corners of the patient's mouth. At this time, the first servo motor will be started, and the first servo motor and the second servo motor will rotate synchronously. The first servo motor and the second servo motor have the same speed but opposite rotation directions. The output end of the first servo motor rotates to drive the output shaft to rotate, and the output shaft rotates to drive the spiral rod to rotate. The spiral rod rotates to drive the movable sleeve to move along the spiral rod toward one end close to the first servo motor. The movable sleeve moves several expansion rods at one end of the linkage rod to move in the upper and lower directions. At this time, the expansion rod drives the sliding block to move, and the sliding block drives the upper support box and the lower support box on the arc groove to rotate around the rotating column. At this time, the upper support box pushes the patient's upper jaw upward to open, and the lower support box pushes the patient's lower jaw downward to open. This arrangement is conducive to the device automatically opening the patient's mouth, and at the same time assisting the patient's mouth to remain open for a long time, avoiding the patient's mouth from closing when the doctor performs an oral examination, thereby enhancing the practicality of the device.

[0018] (3) The present invention sets a rotating mechanism. When the output ends of the first servo motor and the second servo motor rotate to drive the output shaft to rotate, the output shaft drives the gear teeth to rotate. Since the gear teeth are engaged with the arc-shaped rack, the rotation of the gear teeth drives the output shaft to slide outward along the limiting groove. The output shaft slides outward along the limiting groove and drives the pulling and expanding mechanism to slide outward. This setting is conducive to moving the pulling and expanding mechanism away from the direction facing the patient's mouth, expanding the space for the doctor to examine the patient's mouth, and facilitating the doctor to examine the patient's mouth more intuitively, thereby avoiding the phenomenon of insufficient examination due to the doctor's obstructed vision.

[0019] (4) The present invention provides an expansion protection mechanism. When performing an oral examination, the patient places the upper teeth on the sliding plate in the upper support box and the lower teeth on the sliding plate in the lower support box. When the oral cavity is expanded, the upper and lower rows of teeth squeeze the sliding plate. The sliding plate is squeezed along the inner wall of the upper support box and the lower support box to squeeze the reset spring. At this time, the sliding plate squeezes the air inside the upper support box and the lower support box into the protective airbag through the ventilation hose. This arrangement is conducive to the upper and lower oral cavity fully contacting the protective airbag, so that the patient's oral cavity can be protected by the protective airbag, and at the same time, the comfort of the device is improved.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 A magnified view of middle A;

[0024] Figure 3 This is a schematic diagram of the overall structure of the pulling and expanding support mechanism of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged view of middle B;

[0026] Figure 5 This is a schematic diagram of the partial structure of the transverse expansion mechanism of the present invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged view of middle C;

[0028] Figure 7 Schematic diagram of the overall structure of the support mechanism of the present invention;

[0029] Figure 8 An exploded view of the expansion protection mechanism of the present invention;

[0030] Figure 9 For the present invention Figure 8 Enlarged view of D in the middle.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] Figure: 1. Equipment base; 11. Support column; 12. Expansion auxiliary frame; 13. Fixed rod; 14. Sliding slot; 15. First servo motor; 16. Second servo motor; 2. Pull expansion mechanism; 201. Output shaft; 202. Screw rod; 203. Moving sleeve; 204. Linkage rod; 205. Expansion rod; 206. Sliding block; 207. Arc slot; 3. Support mechanism; 301. Upper support box; 302. Lower support Box; 303, rotating column; 4, rotating mechanism; 401, limiting groove; 402, gear teeth; 403, arc-shaped rack; 5, lateral expansion mechanism; 501, connecting block; 502, arc-shaped two-way telescopic rod; 503, sliding ring; 504, extrusion spring; 505, supporting arc plate; 6, expansion protection mechanism; 601, sliding plate; 602, fixed plate; 603, protective airbag; 604, return spring; 605, ventilation hose. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1, please refer to Figure 1-Figure 5 As shown, the present invention is an oral expansion device for oral examination, including a device base 1, a plurality of support columns 11 are fixedly connected directly above the device base 1, an expansion auxiliary frame 12 is fixedly connected directly above the support columns 11, a fixed rod 13 is fixedly connected to the side wall of the expansion auxiliary frame 12, and a sliding groove 14 is formed at one end of the fixed rod 13 away from the expansion auxiliary frame 12, a first servo motor 15 is slidably connected to the sliding groove 14, a second servo motor 16 is slidably connected to the sliding groove 14, and the first servo motor 15 and the second servo motor 16 rotate synchronously, and further comprising:

[0035] The pulling and expanding mechanism 2 includes an output shaft 201 fixedly connected to the output end of the first servo motor 15, and the end of the output shaft 201 away from the first servo motor 15 is fixedly connected to a screw rod 202, and the end of the screw rod 202 away from the output shaft 201 is rotatably connected to a movable sleeve 203.

[0036] The pulling expansion mechanism 2 also includes several linkage rods 204 rotatably connected to the movable sleeve 203, and the end of the linkage rod 204 away from the movable sleeve 203 is rotatably connected to the expansion rod 205, and the end of the expansion rod 205 away from the linkage rod 204 is fixedly connected to the sliding block 206, and the end of the sliding block 206 away from the expansion rod 205 is slidably connected to the arc groove 207.

[0037] A support mechanism 3 is provided on the side of the arc groove 207 away from the sliding block 206. The support mechanism 3 includes an upper support box 301 fixedly connected to the end of the arc groove 207 away from the sliding block 206. The bottom of the upper support box 301 is rotatably connected to a rotating column 303, and the rotating column 303 is rotatably connected to the lower support box 302. The upper support box 301 is rotatably connected to the lower support box 302 through the rotating column 303. The function of this component is that when the oral expansion device is used, the patient who needs to have an oral examination first places the support mechanism 3 inside the oral cavity, and at the same time allows the left and right supporting arc plates 505 to clamp the patient's mouth corners. At this time, the first servo motor 15 is started, and the first servo motor 15 rotates synchronously with the second servo motor 16. The first servo motor 15 and the second servo motor 16 have the same speed but opposite rotation directions. The output end of the first servo motor 15 rotates to drive the output shaft. 201 rotates, the output shaft 201 rotates to drive the screw rod 202 to rotate, the screw rod 202 rotates to drive the movable sleeve 203 to move along the screw rod 202 toward one end close to the first servo motor 15, and the movable sleeve 203 moves several expansion rods 205 at one end of the linkage rod 204 to move in the upper and lower directions. At this time, the expansion rod 205 drives the sliding block 206 to move, and the sliding block 206 drives the upper support box 301 and the lower support box 302 on the arc groove 207 to rotate around the rotating column 303. At this time, the upper support box 301 pushes the patient's upper jaw to open upward, and the lower support box 302 pushes the patient's lower jaw to open downward. This arrangement is conducive to the device automatically opening the patient's mouth, and at the same time assisting the patient's mouth to remain open for a long time, avoiding the patient's mouth from closing when the doctor performs an oral examination, thereby enhancing the practicality of the device.

[0038] A rotating mechanism 4 is provided just above the expansion auxiliary frame 12. The rotating mechanism 4 includes a limiting groove 401 provided on the expansion auxiliary frame 12. The output shaft 201 slides inside the limiting groove 401. A gear tooth 402 is provided at one end of the output shaft 201 close to the first servo motor 15. An arc-shaped rack 403 is fixedly connected to the end of the expansion auxiliary frame 12 away from the limiting groove 401. The gear tooth 402 is meshed with the arc-shaped rack 403. The function of this component is to drive the output shaft 201 to rotate when the output ends of the first servo motor 15 and the second servo motor 16 rotate. When the shaft 201 rotates, the output shaft 201 drives the gear teeth 402 to rotate. Since the gear teeth 402 are engaged with the arc-shaped rack 403, the rotation of the gear teeth 402 will drive the output shaft 201 to slide outward along the limiting groove 401. The output shaft 201 slides outward along the limiting groove 401, driving the pulling and expanding mechanism 2 to slide outward. This arrangement is conducive to moving the pulling and expanding mechanism 2 away from the direction directly facing the patient's mouth, expanding the doctor's space for examining the patient's mouth, and facilitating the doctor to examine the patient's mouth more intuitively, thereby avoiding the phenomenon of inadequate examination due to obstruction of the doctor's line of sight.

[0039] Example 2 is distinguished from Example 1 in that: Figures 1-9 As shown, a lateral expansion mechanism 5 is provided on the side wall of the expansion rod 205 , and the lateral expansion mechanism 5 includes a connecting block 501 fixedly connected to the side wall of the expansion rod 205 , and an arc-shaped bidirectional telescopic rod 502 is fixedly connected to the bottom of the connecting block 501 .

[0040] The lateral expansion mechanism 5 also includes a sliding ring 503 slidably connected to the middle of the arc-shaped two-way telescopic rod 502, and an extrusion spring 504 is sleeved on the arc-shaped two-way telescopic rod 502. The sliding ring 503 is fixedly connected to a supporting arc plate 505 at one end away from the arc-shaped two-way telescopic rod 502. The function of this component is to set the lateral expansion mechanism 5. When the output shaft 201 drives the gear teeth 402 to rotate, since the gear teeth 402 are engaged with the arc-shaped rack 403, the rotation of the gear teeth 402 will drive the output shaft 201 to slide outward along the limit groove 401, and the output shaft 201 slides outward along the limit groove 401 to drive the sliding plate on the expansion rod 205. The block 206 slides outward along the arc groove 207, and the expansion rod 205 drives the sliding ring 503 on the connecting block 501 to move outward. The outward movement of the sliding ring 503 drives the supporting arc plate 505 to move outward. The outward movement of the supporting arc plate 505 drives the corners of the mouth to open to both sides. This arrangement is conducive to opening the patient's lips and preventing the patient's lips from blocking the inside of the patient's mouth; since the sliding ring 503 slides on the arc-shaped two-way telescopic rod 502, the supporting arc plate 505 on the sliding ring 503 can slide up and down along the arc-shaped two-way telescopic rod 502. This arrangement is conducive to the supporting arc plate 505 in the device to better fit the corners of the patient's mouth.

[0041] An expansion protection mechanism 6 is provided inside the upper support box 301, and the expansion protection mechanism 6 includes a sliding plate 601 slidably connected to the inner cavity of the upper support box 301, a fixed plate 602 is fixedly connected directly above the upper support box 301, and a protective airbag 603 is fixedly connected directly above the fixed plate 602.

[0042] The expansion protection mechanism 6 also includes a plurality of return springs 604 fixedly connected to the side of the sliding plate 601 away from the fixed plate 602. The bottom of the upper support box 301 is fixedly connected to a plurality of ventilation hoses 605. The end of the ventilation hose 605 away from the upper support box 301 is fixedly connected to the protection airbag 603. The protection airbag 603 is connected to the inner cavity of the upper support box 301 through the ventilation hose 605. The function of this component is to set the expansion protection mechanism 6 so that when performing an oral examination, the patient places the upper teeth on the sliding plate 601 in the upper support box 301 and the lower teeth on the lower On the sliding plate 601 in the support box 302, when the oral cavity is expanded, the upper and lower rows of teeth squeeze the sliding plate 601, and the sliding plate 601 is squeezed along the inner walls of the upper support box 301 and the lower support box 302 to squeeze the return spring 604. At this time, the sliding plate 601 squeezes the air inside the upper support box 301 and the lower support box 302 into the protective airbag 603 through the ventilation hose 605. This arrangement is conducive to the upper and lower oral cavity fully contacting the protective airbag 603, so that the patient's oral cavity can be protected by the protective airbag 603, while also improving the comfort of the device.

[0043] A specific application of this embodiment is:

[0044] When using the oral expansion device, first, let the patient who needs to examine the oral cavity place the support mechanism 3 inside the oral cavity, and at the same time let the left and right supporting arc plates 505 clamp the patient's mouth corners, then start the first servo motor 15, and the first servo motor 15 and the second servo motor 16 rotate synchronously, the first servo motor 15 and the second servo motor 16 have the same speed but opposite rotation directions, the output end of the first servo motor 15 rotates to drive the output shaft 201 to rotate, the output shaft 201 rotates to drive the screw rod 202 to rotate, the screw rod 202 rotates to drive the movable sleeve 203 to move along the screw rod 202 toward one end close to the first servo motor 15, the movable sleeve 203 moves several times to drive the expansion rod 205 at one end of the linkage rod 204 to move in the upper and lower directions, at this time the expansion rod 205 drives the sliding block 206 to move, the sliding block 206 drives the upper support box 301 and the lower support box 302 on the arc slot 207 to rotate around the rotating column 303, at this time the upper support box 301 is against the patient's oral palate. The device is stretched upward, and the lower support box 302 is stretched downward against the patient's lower jaw. This arrangement is conducive to the device automatically stretching the patient's mouth, while assisting the patient's mouth to remain open for a long time, avoiding the patient's mouth from closing when the doctor performs an oral examination, thereby enhancing the practicality of the device; by setting the rotating mechanism 4, when the output ends of the first servo motor 15 and the second servo motor 16 rotate to drive the output shaft 201 to rotate, the output shaft 201 drives the gear teeth 402 to rotate. Since the gear teeth 402 are engaged with the arc-shaped rack 403, the rotation of the gear teeth 402 will drive the output shaft 201 to slide outward along the limiting groove 401, and the output shaft 201 slides outward along the limiting groove 401, driving the pulling and expanding support mechanism 2 to slide outward. This arrangement is conducive to moving the pulling and expanding support mechanism 2 away from the direction facing the patient's mouth, expanding the doctor's space for examining the patient's mouth, and facilitating the doctor to examine the patient's mouth more intuitively, thereby avoiding the phenomenon of inadequate examination due to obstruction of the doctor's line of sight;

[0045] In addition, by setting up the lateral expansion mechanism 5, when the output shaft 201 drives the gear teeth 402 to rotate, since the gear teeth 402 are meshed with the arc-shaped rack 403, the rotation of the gear teeth 402 will drive the output shaft 201 to slide outward along the limiting groove 401, and the output shaft 201 slides outward along the limiting groove 401, driving the sliding block 206 on the expansion rod 205 to slide outward along the arc groove 207, and the expansion rod 205 drives the sliding ring 503 on the connecting block 501 to move outward, and the outward movement of the sliding ring 503 drives the supporting arc plate 505 to move outward, and the outward movement of the supporting arc plate 505 drives the corners of the mouth to open to both sides. This arrangement is conducive to opening the patient's lips and preventing the patient's lips from blocking the inside of the patient's mouth; since the sliding ring 503 slides on the arc-shaped two-way telescopic rod 502, the supporting arc plate 505 on the sliding ring 503 can slide along the arc-shaped two-way telescopic rod 502. The retraction rod 502 slides up and down, and this arrangement helps the supporting arc plate 505 in the device to fit the corners of the patient's mouth more closely; by setting the expansion protection mechanism 6, when performing an oral examination, the patient places the upper teeth on the sliding plate 601 in the upper support box 301, and places the lower teeth on the sliding plate 601 in the lower support box 302. When the oral cavity is expanded, the upper and lower rows of teeth squeeze the sliding plate 601, and the sliding plate 601 is squeezed along the inner walls of the upper support box 301 and the lower support box 302 to squeeze the return spring 604. At this time, the sliding plate 601 squeezes the air inside the upper support box 301 and the lower support box 302 into the protective airbag 603 through the ventilation hose 605 respectively. This arrangement helps the upper and lower oral cavity to fully contact the protective airbag 603, so that the patient's oral cavity can be protected by the protective airbag 603, and also improves the comfort of the device.

[0046] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An oral expansion device for oral examination, comprising a device base (1), wherein a plurality of support columns (11) are fixedly connected directly above the device base (1), an expansion auxiliary frame (12) is fixedly connected directly above the support columns (11), a fixed rod (13) is fixedly connected to the side wall of the expansion auxiliary frame (12), a sliding groove (14) is provided at one end of the fixed rod (13) away from the expansion auxiliary frame (12), a first servo motor (15) is slidably connected inside the sliding groove (14), a second servo motor (16) is slidably connected inside the sliding groove (14), the first servo motor (15) and the second servo motor (16) rotate synchronously, and the invention is characterized in that: Also includes: A pulling and expanding mechanism (2), the pulling and expanding mechanism (2) comprising an output shaft (201) fixedly connected to an output end of a first servo motor (15), an end of the output shaft (201) away from the first servo motor (15) being fixedly connected to a screw rod (202), and an end of the screw rod (202) away from the output shaft (201) being rotatably connected to a movable sleeve (203); The pulling and expanding mechanism (2) further comprises a plurality of linkage rods (204) rotatably connected to the movable sleeve (203), wherein one end of the linkage rod (204) away from the movable sleeve (203) is rotatably connected to an expansion rod (205), one end of the expansion rod (205) away from the linkage rod (204) is fixedly connected to a sliding block (206), and one end of the sliding block (206) away from the expansion rod (205) is slidably connected to an arc groove (207); A rotating mechanism (4) is provided directly above the expansion auxiliary frame (12), and the rotating mechanism (4) includes a limiting groove (401) provided on the expansion auxiliary frame (12), the output shaft (201) slides inside the limiting groove (401), and a gear tooth (402) is provided at one end of the output shaft (201) close to the first servo motor (15), and an arc-shaped rack (403) is fixedly connected to one end of the expansion auxiliary frame (12) away from the limiting groove (401), and the gear tooth (402) is meshed with the arc-shaped rack (403).

2. The oral cavity expansion device for oral examination according to claim 1, characterized in that: A support mechanism (3) is provided on a side of the arc groove (207) away from the sliding block (206), and the support mechanism (3) comprises an upper support box (301) fixedly connected to an end of the arc groove (207) away from the sliding block (206), a rotating column (303) being rotatably connected to the bottom of the upper support box (301), a lower support box (302) being rotatably connected to the rotating column (303), and the upper support box (301) is rotatably connected to the lower support box (302) via the rotating column (303).

3. The oral cavity expansion device for oral examination according to claim 1, characterized in that: A transverse expansion mechanism (5) is provided on the side wall of the expansion rod (205), and the transverse expansion mechanism (5) comprises a connecting block (501) fixedly connected to the side wall of the expansion rod (205), and an arc-shaped bidirectional telescopic rod (502) is fixedly connected to the bottom of the connecting block (501).

4. The oral cavity expansion device for oral examination according to claim 3, characterized in that: The transverse expansion mechanism (5) further comprises a sliding ring (503) slidably connected to the middle of the arc-shaped bidirectional telescopic rod (502), a compression spring (504) being sleeved on the arc-shaped bidirectional telescopic rod (502), and a supporting arc plate (505) being fixedly connected to one end of the sliding ring (503) away from the arc-shaped bidirectional telescopic rod (502).

5. The oral cavity expansion device for oral examination according to claim 2, characterized in that: An expansion protection mechanism (6) is provided inside the upper support box (301), the expansion protection mechanism (6) comprising a sliding plate (601) slidably connected to the inner cavity of the upper support box (301), a fixed plate (602) fixedly connected directly above the upper support box (301), and a protective airbag (603) fixedly connected directly above the fixed plate (602).

6. The oral cavity expansion device for oral examination according to claim 5, characterized in that: The expansion protection mechanism (6) further comprises a plurality of return springs (604) fixedly connected to the side of the sliding plate (601) away from the fixed plate (602); a plurality of ventilation hoses (605) are fixedly connected to the bottom of the upper support box (301); one end of the ventilation hose (605) away from the upper support box (301) is fixedly connected to the protection airbag (603); and the protection airbag (603) is communicated with the inner cavity of the upper support box (301) via the ventilation hose (605).

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