CN210931473U - Oral cavity CBCT device and driving mechanism thereof - Google Patents

Abstract

The utility model discloses an oral cavity CBCT device and actuating mechanism thereof, guiding mechanism includes: the lead screw subassembly, the lead screw subassembly includes: the flexible support component is connected with the upper end of the screw rod and used for supporting the upper end of the screw rod; a nut assembly, the nut assembly comprising: the nut bracket is provided with a nut which can swing around an axis extending along the horizontal direction, and the nut is sleeved on the screw rod; and the driving assembly is connected with the screw rod and is used for driving the screw rod to rotate so as to be meshed with the nut threads. According to the utility model discloses an actuating mechanism can guarantee that lead screw and nut remain coaxial throughout for lead screw and nut meshing area are the biggest, and pressure is minimum, and transmission efficiency is high, avoids the nut to wear and tear with higher speed, avoids producing noise and vibration abnormal sound.

Description

Oral cavity CBCT device and driving mechanism thereof

Technical Field

The utility model relates to a drive mechanism for oral cavity CBCT device and oral cavity CBCT device that has it.

Background

In the related art, in a three-in-one oral cavity CBCT (Cone beam CT for short), the sliding column drives the main rotating arm and the side position arm to slide up and down to adjust the height so as to adapt to the heights of different shooting patients. Since the cantilevers of the main rotating arm and the side arm are long and heavy, the sliding columns are subjected to moments of tilting forward and tilting in the respective directions.

At present, the common driving mode is a combination mode of a motor lead screw, which is divided into two modes according to different relatively static parts, the motor lead screw is arranged on a sliding column to move up and down together, a nut is fixed on the column, and the motor lead screw is arranged on the column, and the nut is fixed on the sliding column to move up and down together. However, the nut in the related art has large abrasion and short service life.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an actuating mechanism for oral cavity CBCT device, actuating mechanism's lead screw and nut meshing area is big, and pressure is little, and transmission efficiency is high.

The utility model also provides an oral cavity CBCT device with above-mentioned actuating mechanism.

According to the utility model discloses a actuating mechanism for oral cavity CBCT device of first aspect includes: a screw assembly, the screw assembly comprising: the flexible support component is connected with the upper end of the screw rod and is used for supporting the upper end of the screw rod; a nut assembly, the nut assembly comprising: the nut support is provided with a nut, the nut is arranged on the nut support in a swinging mode around an axis extending along the horizontal direction, and the nut is sleeved on the screw rod; and the driving assembly is connected with the screw rod and is used for driving the screw rod to rotate so as to be in threaded engagement with the nut.

According to the utility model discloses a actuating mechanism for oral cavity CBCT device can guarantee that lead screw and nut remain coaxial throughout for lead screw and nut meshing area is the biggest, and pressure is minimum, and transmission efficiency is high, and the local pressure of certain position when can also avoiding lead screw and nut meshing excessively causes the nut to wear and tear with higher speed, avoids producing noise and vibration abnormal sound.

In some embodiments, the screw rod is formed at a lower end thereof with a first support part, and the rigid support part is sleeved on the first support part, and the rigid support part includes: the bearing mounting hole is formed in the rigid bearing seat; the thrust bearing is arranged in the bearing mounting hole, and the thrust bearing is sleeved on the first supporting part.

In some embodiments, the thrust bearing includes two, and the rigid support member further includes: the first bushing is sleeved on the first supporting part and located between the two thrust bearings.

In some embodiments, the rigid support member further comprises: and the locknut is in threaded connection with the free end of the first supporting part.

In some embodiments, the rigid support member further comprises: the adjusting ring is sleeved on the first supporting part and is abutted against the upper surface of the thrust bearing.

In some embodiments, a second supporting portion is formed at an upper end of the screw rod, the flexible supporting member is sleeved on the second supporting portion, and the flexible supporting member includes: the flexible bearing seat is provided with a lining mounting hole; the second bushing is arranged in the bushing mounting hole, and the second bushing is sleeved on the second supporting part.

In some embodiments, the drive assembly comprises: a motor bracket; the driving motor is arranged on the motor bracket and is provided with a driving shaft; and the coupler is in transmission connection with the driving shaft and the screw rod respectively.

In some embodiments, the nut holder is formed with a shaft hole penetrating the nut holder in a left-right direction, and the nut assembly further includes: the rotating shaft is rotatably arranged in the shaft hole, and the nut is fixed on the rotating shaft.

In some embodiments, the rotating shaft is formed with a nut connecting hole extending perpendicular to the axis of the rotating shaft, and the nut extends into the nut connecting hole and is in threaded connection with the rotating shaft.

In some embodiments, a shoulder is formed at one end of the rotation shaft in the axial direction, and the nut assembly further includes: the shaft end blocking piece is connected to the other end of the rotating shaft, and the shaft shoulder and the shaft end blocking piece are respectively abutted to the peripheries of the two axial ends of the shaft hole.

According to the utility model discloses oral cavity CBCT device of second aspect includes: a base frame; a drive mechanism according to the first aspect of the present invention for an oral CBCT apparatus; a slide column connected to one of the screw and the nut, the other of the screw and the nut being fixed to the base frame, the screw-nut driving mechanism being configured to drive the slide column to be movable in an up-down direction with respect to the base frame; a guide assembly connected between the sliding column and the base frame for guiding the sliding column.

According to the utility model discloses an oral cavity CBCT device can guarantee that lead screw and nut remain coaxial throughout for lead screw and nut meshing area is the biggest, and pressure is minimum, and transmission efficiency is high, and can also avoid lead screw and nut meshing time when the local pressure of certain position too big lead to the fact the nut wearing and tearing with higher speed, avoids producing noise and vibration abnormal sound.

In some embodiments, the guide assembly comprises: the guide rod extends along the up-down direction and is fixed on the base frame; a first rolling member disposed on the guide bar, the first rolling member comprising: a first rolling member rotatable about a first axis extending in a left-right direction; a second rolling member disposed on the guide bar, the second rolling member comprising: a second rolling member rotatable about a second axis extending in the front-rear direction; the sliding column is provided with a sliding groove extending along the vertical direction, and the first rolling piece and the second rolling piece are both rotatably arranged in the sliding groove and abutted against the inner wall of the sliding groove.

In some embodiments, the first rolling component further comprises: the first rolling part is sleeved on the first connecting shaft, the guide rod is provided with a connecting hole, and the first connecting shaft is fixedly connected with the guide rod through the connecting hole.

In some embodiments, the free end of the first connecting shaft passes through the connecting hole, and the free end of the first connecting shaft is threadedly connected with the base frame.

In some embodiments, the second rolling component further comprises: the support is fixed on the guide rod, an accommodating groove facing the bottom wall opening of the sliding groove is formed in the support, the second rolling piece is rotatably arranged in the accommodating groove, and part of the second rolling piece extends out of the opening of the accommodating groove.

In some embodiments, the mount is formed with a through hole penetrating the receiving groove in a front-rear direction, and the second rolling member further includes: the second connecting shaft penetrates through the through hole and is fixed on the support, and the second rolling piece is sleeved on the second connecting shaft.

In some embodiments, the second rolling member further includes an adjusting shim, and the adjusting shim is sleeved on the second connecting shaft and located between the second rolling member and the side wall of the accommodating groove.

In some embodiments, the second rolling component further comprises: the rubber cushion block is fixed on the guide rod, and the support is connected with the rubber cushion block.

In some embodiments, the first rolling member comprises a plurality of first rolling members, and the plurality of first rolling members are arranged at intervals along the length direction of the guide rod; and/or the second rolling parts comprise a plurality of second rolling parts which are arranged at intervals along the length direction of the guide rod.

In some embodiments, the first rolling element and the second rolling element are both encapsulated bearings.

In some embodiments, the base frame is provided with a side support plate extending in an up-down direction, the side support plate is provided with a first plate portion and a second plate portion, the first plate portion and the second plate portion both extend in a front-back direction and are arranged oppositely at intervals in a left-right direction, the number of the guide assemblies is two, the two guide assemblies are respectively connected with the first plate portion and the second plate portion, the sliding column is arranged between the first plate portion and the second plate portion, and two sliding grooves corresponding to the two guide assemblies one to one are formed in the sliding column.

In some embodiments, the side brace further has a web portion extending in the left-right direction and connected between the rear end of the first web portion and the rear end of the second web portion.

In some embodiments, the second rolling member is an encapsulating member, and when the sliding column is not assembled, the minimum distance between the second rolling member of the guide assembly on the left side and the second rolling member of the guide assembly on the right side in the horizontal direction is d 1; the distance between the bottom wall of the sliding chute on the left side of the sliding column and the bottom wall of the sliding chute on the right side of the sliding column in the horizontal direction is d 2; wherein d1 and d2 satisfy: d1 is less than d 2.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is an exploded view of an oral CBCT apparatus according to an embodiment of the present invention;

fig. 2 is a schematic view of an oral CBCT apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a top view of the oral CBCT apparatus shown in FIG. 2;

FIG. 4 is an enlarged view of the area circled A in FIG. 3;

FIG. 5 is a cross-sectional view of the oral CBCT device shown in FIG. 2;

FIG. 6 is a schematic view of the guide assembly shown in FIG. 1;

FIG. 7 is an exploded view of the steering assembly shown in FIG. 6;

FIG. 8 is a schematic view of another angle of the guide assembly shown in FIG. 6;

FIG. 9 is a cross-sectional view of the guide assembly shown in FIG. 8 taken along line B-B;

FIG. 10 is a schematic view of the drive mechanism shown in FIG. 1;

FIG. 11 is an exploded view of the drive mechanism shown in FIG. 10;

FIG. 12 is a schematic view of another angle of the drive mechanism shown in FIG. 10;

FIG. 13 is a cross-sectional view of the drive mechanism shown in FIG. 12 taken along line C-C;

FIG. 14 is a schematic illustration of a perspective view of the nut assembly shown in FIG. 10;

FIG. 15 is a schematic illustration of a top view of the nut assembly shown in FIG. 14;

FIG. 16 is a cross-sectional view taken along line E-E of FIG. 15;

fig. 17 is a sectional view taken along line F-F in fig. 15.

Reference numerals:

the CBCT apparatus 100 for the oral cavity is provided,

a base frame 1, side support plates 11, a first plate 111, a second plate 112, a connecting plate 113,

the guide assembly (2) is provided with a guide component,

the guide bar 21, the connection hole 211,

the first rolling member 22, the first rolling member 221, the first connecting shaft 222,

the second rolling member 23, the second rolling element 231, the support 232, the receiving groove 2321, the through hole 2322, the second connecting shaft 233, the adjusting washer 234, the rubber packing 235,

the sliding column 3, the sliding groove 31,

the drive mechanism (4) is arranged on the frame,

the lead screw assembly 41 is provided with a screw rod assembly,

a screw 411, a first supporting portion 4111, a second supporting portion 4112,

rigid support member 412, rigid bearing housing 4121, bearing mounting hole 41211, thrust bearing 4122, first bushing 4123, locknut 4124, adjusting ring 4125,

the flexible support component 413, the flexible bearing seat 4131, the bushing mounting hole 41311, the second bushing 4132, the driving assembly 42, the motor support 421, the driving motor 422, the driving shaft 4221, the coupling 423, the nut assembly 43, the nut support 431, the shaft hole 4311, the nut 432, the rotating shaft 433, the nut connecting hole 4331, the shaft shoulder 4332 and the shaft end blocking piece 434.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The following describes in detail the drive mechanism 4 for the oral CBCT apparatus 100 according to an embodiment of the first aspect of the present invention.

As shown in fig. 1, 10-17, a driving mechanism 4 for an oral CBCT apparatus 100 according to an embodiment of the present invention includes: a lead screw assembly 41, a drive assembly 42 and a nut assembly 43.

Specifically, as shown in fig. 10 and 11, the lead screw assembly 41 may include: a screw 411, a rigid support part 412 and a flexible support part 413, wherein the screw 411 extends in the up-down direction, the rigid support part 412 is connected with the lower end of the screw 411 for supporting the lower end of the screw 411, and the flexible support part 413 is connected with the upper end of the screw 411 for supporting the upper end of the screw 411.

As shown in fig. 11, the nut assembly 43 includes: a nut holder 431 and a nut 432, the nut 432 being provided on the nut holder 431 swingably about an axis extending in the horizontal direction, the nut 432 being fitted over the lead screw 411, the nut 432 being threadedly engaged with the lead screw 411. A drive assembly 42 is coupled to the lead screw 411, the drive assembly 42 being adapted to drive the lead screw 411 in rotation to threadably engage the nut 432.

As shown in fig. 1, the sliding column 3 of the oral cavity CBCT apparatus 100 is connected to one of the screw rod 411 and the nut 432, the other of the screw rod 411 and the nut 432 is fixed to the base frame 1 of the oral cavity CBCT apparatus 100, and the driving mechanism 4 for the oral cavity CBCT apparatus 100 of the present embodiment is used for engaging the screw rod 411 with the nut 432, so as to realize the up-and-down movement of the sliding column 3 relative to the base frame 1. Wherein, the cantilever and the side arm of the oral CBCT device 100 are both arranged on the sliding column 3.

During the operation of the oral CBCT apparatus 100, the cantilever and the side arm make the sliding column 3 receive the moment in the front-back direction and/or the left-right direction, and the moment is transmitted to the screw rod 411 of the driving mechanism 4, so that the screw rod 411 receives the moment in the front-back direction and/or the moment in the left-right direction. Since the flexible support member 413 is provided at the upper end of the screw 411 and the rigid support member 412 is provided at the lower end of the screw, when the screw 411 receives a moment in the front-rear direction or a moment in the left-right direction, the screw 411 is supported flexibly at the upper end, and thus, the screw 411 is slightly tilted or swung with respect to the rigid support member 412 with the rigid support member 412 as a fulcrum or a fixed point. Meanwhile, as the nut 432 in the nut component 43 can swing around the axis extending along the horizontal direction, when the screw rod 411 inclines or swings, the screw rod 411 can drive the nut 432 to incline or swing together, so that the screw rod 411 and the nut 432 are always kept coaxial, therefore, the meshing area of the screw rod 411 and the nut 432 is the largest, the pressure intensity is the smallest, the transmission efficiency is high, the nut 432 is prevented from being abraded in an accelerated manner due to overlarge local pressure at a certain part when the screw rod 411 and the nut 432 are meshed, and noise and vibration abnormal sound are avoided.

Therefore, according to the utility model discloses a actuating mechanism 4 for oral cavity CBCT device 100 can guarantee that lead screw 411 and nut 432 remain coaxial throughout for lead screw 411 and nut 432 area of meshing is the biggest, and pressure is minimum, and transmission efficiency is high, and can also avoid lead screw 411 and nut 432 to mesh when the local pressure of certain position excessively causes nut 432 to wear with higher speed, avoids producing noise and vibration abnormal sound.

In some embodiments of the present invention, as shown in fig. 11, the lower end of the screw rod 411 is formed with a first supporting portion 4111, the rigid supporting member 412 is sleeved on the first supporting portion 4111, and the rigid supporting member 412 includes: a rigid bearing housing 4121 and a thrust bearing 4122, the rigid bearing housing 4121 having a bearing mounting hole 41211 formed therein; the thrust bearing 4122 is disposed in the bearing mounting hole 41211, and the thrust bearing 4122 is sleeved on the first supporting portion 4111. This makes it possible to rigidly support the lower end of the screw 411. The rigid bearing housing 4121 may be a metal bearing housing.

In some embodiments, as shown in fig. 11, the thrust bearing 4122 may include two, and the rigid support member 412 further includes: the first bushing 4123 is sleeved on the first supporting portion 4111, and the first bushing 4123 is located between the two thrust bearings 4122. This can improve the stability and reliability of the support of the wire rod 411 by the rigid support member 412. Wherein, optionally, the first liner 4123 may be an oilless liner.

In some embodiments, as shown in fig. 11, the rigid support member 412 may further include: the lock nut 4124, the lock nut 4124 is screwed with the free end of the first support portion 4111. The lock nut 4124 can lock the thrust bearing 4122, the rigid bearing housing 4121, etc. fitted over the first support portion 4111 to prevent the components (the thrust bearing 4122, the rigid bearing housing 4121, the first bush 4123, etc.) from slipping off.

In some embodiments, as shown in fig. 11, the rigid support member 412 may further include: the adjusting ring 4125 is sleeved on the first supporting portion 4111 and abuts against the upper surface of the thrust bearing 4122. For example, the adjustment ring 4125 is stopped between the end surface of the fixed end of the first support portion 4111 and the upper surface of the thrust bearing 4122 located above of the two thrust bearings 4122. Thus, the supporting position of the thrust bearing 4122 can be adjusted by the adjusting ring 4125, and the adjusting ring 4125 can also space the thrust bearing 4122 from the fixed end surface of the first supporting portion 4111 to avoid the fixed end surface from interfering with the thrust bearing 4122.

According to some embodiments of the present invention, as shown in fig. 11, the upper end of the screw rod 411 may be formed with a second supporting portion 4112, the flexible supporting member 413 is sleeved on the second supporting portion 4112, the flexible supporting member 413 includes: a flexible bearing housing 4131 and a second bushing 4132, the flexible bearing housing 4131 having a bushing mounting hole 41311 formed therein; the second bushing 4132 is disposed in the bushing mounting hole 41311, and the second bushing 4132 is sleeved on the second supporting portion 4112. Thereby, a flexible support of the upper end of the screw 411 can be achieved. Wherein the flexible bearing housing 4131 may be a rubber bearing housing and the second bushing 4132 may be an oilless bushing.

According to some embodiments of the present invention, as shown in fig. 11, the driving assembly 42 may include: the driving device comprises a motor support 421, a driving motor 422 and a coupling 423, wherein the driving motor 422 is arranged on the motor support 421, and the driving motor 422 is provided with a driving shaft 4221; the coupling 423 is in transmission connection with the driving shaft 4221 and the lead screw 411 respectively. In the working process, the driving motor 422 drives the driving shaft 4221 to rotate, and the driving shaft 4221 drives the screw rod 411 to rotate through the coupling 423. Wherein, optionally, the driving motor 422 may be a reduction motor.

According to some embodiments of the present invention, as shown in fig. 11, 14-17, the nut bracket 431 is formed with a shaft hole 4311 penetrating the nut bracket 431 in the left-right direction, and the nut component 43 may further include: the rotating shaft 433, the rotating shaft 433 is rotatably disposed in the shaft hole 4311, and the nut 432 is fixed on the rotating shaft 433. When the rotating shaft 433 rotates around an axis extending in the left-right direction, the rotating shaft 433 can drive the nut 432 to swing in the front-back direction. In other words, when the nut 432 is subjected to a moment in the front-rear direction, the nut 432 can drive the rotating shaft 433 to swing in the front-rear direction so as to be coaxial with the lead screw 411.

Further, as shown in fig. 11, a nut connection hole 4331 extending perpendicular to the axis of the rotation shaft 433 may be formed on the rotation shaft 433, and the nut 432 extends into the nut connection hole 4331 to be threadedly connected with the rotation shaft 433. For example, a nut connection hole 4331 extending in the vertical direction is formed in the rotation shaft 433, the nut connection hole 4331 may penetrate the rotation shaft 433 in the vertical direction, an internal thread is formed in the nut connection hole 4331, an external thread is formed on the outer surface of the nut 432, and the nut 432 is threadedly connected to the nut connection hole 4331. Therefore, the rotating shaft 433 can be fixedly connected with the nut 432, the connection is reliable, and the assembly is convenient.

In some examples, as shown in fig. 11, one end of the rotating shaft 433 in the axial direction (e.g., the right end of the rotating shaft 433 shown in fig. 11) is formed with a shoulder 4332, and the nut assembly 43 may further include: a shaft end stop 434, the shaft end stop 434 is connected to the other end of the rotating shaft 433 (for example, the left end of the rotating shaft 433 shown in fig. 11), and the shaft shoulder 4332 and the shaft end stop 434 respectively stop against the peripheries of the two axial ends of the shaft hole 4311. Thus, the shoulder 4332 and the shaft-end stopper 434 can play a role of restraining the rotation shaft 433 in the left-right direction.

The oral CBCT apparatus 100 according to the second aspect of the present invention comprises: the oral cavity CBCT device comprises a base frame 1, a driving mechanism 4, a sliding column 3 and a guide assembly 2, wherein the driving mechanism 4 is the driving mechanism 4 for the oral cavity CBCT device 100 according to the embodiment of the first aspect of the invention, the sliding column 3 is connected with one of a screw rod 411 and a nut 432, the other of the screw rod 411 and the nut 432 is fixed with the base frame 1, and the driving mechanism 4 is used for driving the sliding column 3 to move in the up-down direction relative to the base frame 1; the guide assembly 2 is connected between the sliding column 3 and the base frame 1 for guiding the sliding column 3.

According to the oral cavity CBCT apparatus 100 of the present invention, since the upper end of the screw rod 411 is provided with the flexible supporting member 413 and the lower end is provided with the rigid supporting member 412, when the screw rod 411 receives the moment in the front-back direction or the moment in the left-right direction, the upper end is flexibly supported, and therefore, the screw rod 411 can slightly tilt or swing relative to the rigid supporting member 412 with the rigid supporting member 412 as a fulcrum or a fixed point. Meanwhile, as the nut 432 in the nut component 43 can swing around the axis extending along the horizontal direction, when the screw rod 411 inclines or swings, the screw rod 411 can drive the nut 432 to incline or swing together, so that the screw rod 411 and the nut 432 are always kept coaxial, therefore, the meshing area of the screw rod 411 and the nut 432 is the largest, the pressure intensity is the smallest, the transmission efficiency is high, the nut 432 is prevented from being abraded in an accelerated manner due to overlarge local pressure at a certain part when the screw rod 411 and the nut 432 are meshed, and noise and vibration abnormal sound are avoided.

A guide mechanism for an oral CBCT apparatus 100 according to an embodiment of the first aspect of the present invention is described in detail below.

As shown in fig. 1 and 7, the guiding mechanism for an oral CBCT apparatus 100 according to the embodiment of the present invention includes: base frame 1, guide assembly 2 and sliding column 3.

Specifically, the guide assembly 2 includes: a guide bar 21, a first rolling member 22 and a second rolling member 23, wherein the guide bar 21 extends in an up-down direction (e.g., the up-down direction shown in fig. 1), the guide bar 21 is fixed to the base frame 1, the first rolling member 22 is provided on the guide bar 21, and the first rolling member 22 includes: a first rolling member 221, the first rolling member 221 being rotatable about a first axis extending in a left-right direction (e.g., the left-right direction shown in fig. 1); the second rolling member 23 is provided on the guide bar 21, and the second rolling member 23 includes: a second rolling member 231, the second rolling member 231 being rotatable about a second axis extending in the front-rear direction (e.g., the front-rear direction shown in fig. 1).

The sliding column 3 is arranged on the guide assembly 2, the sliding column 3 can slide along the up-down direction relative to the guide assembly 2, a sliding groove 31 is formed on the sliding column 3, the sliding groove 31 extends along the up-down direction, and the first rolling piece 221 and the second rolling piece 231 are both rotatably arranged in the sliding groove 31 and are abutted to the inner wall of the sliding groove 31. For example, the first rolling member 221 may abut against a front side wall and/or a rear side wall of the chute 31, and the second rolling member 231 may abut against a bottom wall of the chute 31.

Wherein, optionally, the first rolling element 221 may be a bearing, and the second rolling element 231 may also be a bearing. Of course, the present invention is not limited thereto, and the first rolling member 221 and the second rolling member 231 may be other rolling members such as rollers, as long as the rolling fit with the inner wall of the sliding groove 31 can be achieved.

Here, it should be noted that the guide mechanism of the oral CBCT apparatus 100 in the related art generally adopts a linear guide or a slider, and although the linear guide is a guide mechanism commonly used in industry, the linear guide is expensive and the requirement of installation accuracy is high; the sliding block scheme is low in cost, but needs to be adjusted in assembly, sliding friction force is large, sliding blocks are large in abrasion after long-time use, and service life is short.

Therefore, in the guide mechanism for the oral CBCT apparatus 100 of the present embodiment, the first rolling member 221 and the second rolling member 231, whose rotation axes 433 are perpendicular to each other, are disposed on the guide assembly 2 for guiding the sliding column 3, and in the process of sliding the sliding column 3 up and down, the first rolling member 221 can limit the sliding column 3 in the front and rear direction, and the second rolling member 231 can limit the sliding column in the left and right direction, so as to guide the rolling members when sliding up and down, therefore, compared with the sliding block scheme in the related art, the guide mechanism of the present embodiment has rolling friction between the first rolling member 221 and the second rolling member 231 and the inner wall of the sliding slot 31 on the sliding column 3, and has small friction force and small wear, and compared with the linear guide rail in the related art, the guide mechanism of the present embodiment has lower requirement for installation accuracy, large tolerance error and strong flexibility, the assembly efficiency is high, and the cost is low.

In an embodiment of the present invention, as shown in fig. 7, to facilitate the rotatable connection of the first rolling member 221 and the guide bar 21, so that the first rolling member 221 can rotate around the first axis extending from left to right, the first rolling member 22 may further include: the first connecting shaft 222 and the first rolling element 221 are sleeved on the first connecting shaft 222, the guide rod 21 is provided with a connecting hole 211, and the first connecting shaft 222 is fixedly connected with the guide rod 21 through the connecting hole 211.

Further, referring to fig. 1 and 7, one end of the first connection shaft 222 passes through the connection hole 211 and is screw-connected with the base frame 1. In this way, the first connecting shaft 222 not only can fix the first rolling member 221 on the guide rod 21, but also can fix the guide rod 21 on the base frame 1 by the first connecting shaft 222, thereby reducing the number of parts and improving the assembly efficiency.

In some embodiments of the present invention, as shown in fig. 7, to facilitate the rotatable connection of the second rolling member 231 with the guide bar 21, so that the second rolling member 231 can rotate around the second axis extending back and forth, the second rolling member 23 may further include: the support 232 is fixed on the guide rod 21, the support 232 is formed with an accommodating groove 2321, an opening of the accommodating groove 2321 faces the bottom wall of the sliding groove 31, the second rolling element 231 is rotatably arranged in the accommodating groove 2321, and a part of the second rolling element 231 extends out of the opening of the accommodating groove 2321 to abut against the bottom wall of the sliding groove 31. When the sliding post 3 moves up and down, the second rolling member 231 can roll and rub against the bottom wall of the sliding slot 31 to achieve a guiding effect on the sliding post 3.

Further, as shown in fig. 7 and with reference to fig. 1, a through hole 2322 may be formed on the support 232 to penetrate the support 232 in the front-rear direction, the through hole 2322 communicates with the accommodation groove 2321, and the second rolling member 23 may further include: and the second connecting shaft 233 penetrates through the through hole 2322 and is fixed on the support 232, and the second rolling element 231 is sleeved on the second connecting shaft 233. Thereby, the second connecting shaft 233 can facilitate the rotatable connection of the second rolling member 231 with the holder 232.

In some embodiments, as shown in fig. 7, the second rolling element 23 may further include an adjusting shim 234, the adjusting shim 234 is sleeved on the second connecting shaft 233, and the adjusting shim 234 is located between the second rolling element 231 and the sidewall of the accommodating groove 2321, so that the adjusting shim 234 may adjust the interval between the second rolling element 231 and the sidewall of the accommodating groove 2321, and avoid the second rolling element 231 and the sidewall of the accommodating groove 2321 interfering with each other.

In some embodiments, as shown in fig. 7, the second rolling member 23 may further include: the rubber cushion block 235, the rubber cushion block 235 is fixed on the guide rod 21, and the support 232 is connected with the rubber cushion block 235. In the embodiment, the support 232 is fixed on the guide rod 21 by using the rubber cushion block 235, the rubber cushion block 235 can buffer the vibration transmission between the support 232 and the guide rod 21, and meanwhile, the rubber cushion block 235 has elasticity, so that the requirement on the assembly precision of the second rolling element 231 can be reduced in the assembly process, the assembly efficiency is improved, and the cost is reduced. Specifically, the elastic deformation of the rubber pad 235 can be utilized, so that the assembled second rolling member 231 generates pressure on the inner wall of the sliding groove 31, and thus, not only can the stability of the sliding column 3 be ensured, but also the tolerance requirement of the assembly distance between the sliding column 3 and the guide assembly 2 in the left-right direction can be reduced.

Wherein, the support 232 and the rubber pad 235 can be fixed on the guide rod 21 by a connecting piece such as a screw.

In some embodiments, as shown in fig. 7, the first rolling member 22 may include a plurality of first rolling members 221 spaced apart along a length direction (e.g., an up-down direction shown in fig. 7) of the guide bar 21; therefore, the guide precision of the sliding column 3 can be improved, the sliding column 3 is prevented from being inclined under the action of front and back moments and left and right moments, and the motion stability of the sliding column 3 is improved.

In some embodiments, as shown in fig. 7, the second rolling member 23 may include a plurality of second rolling members 231 spaced apart along a length direction (e.g., an up-down direction shown in fig. 7) of the guide bar 21. Therefore, the guide precision of the sliding column 3 can be improved, the sliding column 3 is prevented from being inclined under the action of front and back moments and left and right moments, and the motion stability of the sliding column 3 is ensured.

As shown in fig. 7, the guide assembly 2 may include a guide rod 21, two first rolling members 22 and two second rolling members 23, the guide rod 21 extends along the up-down direction, the guide rod 21 is in a shape of a strip extending along the up-down direction, the two first rolling members 22 are respectively disposed at two ends of the guide rod 21 in the length direction, the two second rolling members 23 are respectively disposed at two ends of the guide rod 21 in the length direction, the first rolling member 22 located at the upper end of the guide rod 21 is located above the second rolling member 23, and the first rolling member 22 located at the lower end of the guide rod 21 is located below the second rolling member 23, in other words, the two second rolling members 23 are located between the two first rolling members 22.

In some embodiments, as shown with reference to fig. 7, the first rolling element 221 may be an encapsulated bearing and the second rolling element 231 may be an encapsulated bearing. The outer surface material of the rubber-covered bearing can be POM (polyformaldehyde, a thermoplastic crystalline polymer) or nylon and other wear-resistant rubber. In the embodiment, the first rolling member 221 and the second rolling member 231 are provided as the rubber-covered bearings, so that the first rolling member 221 and the second rolling member 231 are prevented from being in direct hard contact with the sliding column 3, hard friction is reduced, and the service life is prolonged.

According to some embodiments of the present invention, as shown in fig. 1, the base frame 1 may be provided with a side support plate 11 extending in the up-down direction, the side support plate 11 has a first plate portion 111 and a second plate portion 112, the first plate portion 111 and the second plate portion 112 both extend in the front-back direction, and the first plate portion 111 and the second plate portion 112 are spaced and arranged oppositely in the left-right direction. The guide assemblies 2 may include two guide assemblies 2, the two guide assemblies 2 are respectively connected to the first plate portion 111 and the second plate portion 112, the sliding column 3 is disposed between the first plate portion 111 and the second plate portion 112, and two sliding grooves 31 corresponding to the two guide assemblies 2 one to one are formed on the sliding column 3. For example, the guide assembly 2 located on the left side of the sliding column 3 of the two guide assemblies 2 is connected to the first plate portion 111, and the sliding column 3 is formed with a slide groove 31 on the left side thereof, the slide groove 31 being opposed to and connected to the guide assembly 2 located on the left side of the sliding column 3; the guide member 2 located on the right side of the sliding column 3 among the two guide members 2 is connected to the second plate portion 112, and the sliding column 3 is also formed on the right side thereof with a slide groove 31, the slide groove 31 being opposed to and connected to the guide member 2 located on the right side of the sliding column 3.

Further, as shown in fig. 1, the side support plate 11 may also have a connecting plate portion 113, the connecting plate portion 113 extending in the left-right direction and connecting between the rear end of the first plate portion 111 and the rear end of the second plate portion 112. Thus, an installation space may be defined between the connecting plate portion 113, the first plate portion 111, and the second plate portion 112, and the sliding column 3, the guide assembly 2, and the driving assembly 42 may be disposed in the installation space. Meanwhile, the connecting plate portion 113 can also enhance the integrity between the first plate portion 111 and the second plate portion 112, improve the strength of the side stay 11, and improve the stability of the side stay 11 for supporting the sliding column 3.

In some embodiments, as shown in fig. 1, the side support plate 11 may include an inner plate, an outer plate, and a connecting rib connected between the inner plate and the outer plate, wherein a cross section of the inner plate in a horizontal plane is U-shaped, a cross section of the outer plate in a horizontal plane is also U-shaped, the inner plate is disposed inside the outer plate, two U-shaped free ends of the inner plate are respectively connected with two U-shaped free ends of the outer plate, and the connecting rib is located between the inner plate and the outer plate and connected between the inner plate and the outer plate, so that the strength of the side support plate 11 can be enhanced, the material consumption can be reduced, and the cost can be reduced.

In some embodiments of the present invention, referring to fig. 3 and 4, the second rolling member 231 may be an encapsulating member, when the sliding column 3 is not assembled, the minimum distance between the second rolling member 231 of the guide assembly 2 located on the left side and the second rolling member 231 of the guide assembly 2 located on the right side in the horizontal direction is d1, and the distance between the bottom wall of the chute 31 located on the left side of the sliding column 3 and the bottom wall of the chute 31 located on the right side of the sliding column 3 in the horizontal direction is d 2; wherein d1 and d2 satisfy: d1 is less than d 2. That is, before assembly, the minimum distance between the second rolling members 231 on the left and right sides of the sliding column 3 is smaller than the distance between the bottom walls of the left and right sliding grooves 31 of the sliding column 3. Like this, can utilize the elastic deformation of rubber pad 235 for second rolling member 231 after the assembly produces and pressure to the inner wall of spout 31, not only can guarantee the stability of sliding column 3 from this, can also reduce sliding column 3 in the left and right sides direction and the guide assembly 2 between the tolerance requirement of assembly interval.

Referring now to fig. 1, an oral CBCT apparatus 100 in accordance with an embodiment of the present invention is described.

Referring to fig. 1, an oral CBCT apparatus 100 according to an embodiment of the present invention includes: a drive mechanism 4 and a guide mechanism.

Specifically, as shown in fig. 1, the guide mechanism is composed of a base frame 1, a guide assembly 2 and a sliding column 3. The base frame 1 is composed of upright columns, side supporting plates 11, a bottom plate and ground feet and provides fixed support. The guide assemblies 2 are respectively arranged on the left side and the right side of the side support plate 11 to provide front, back, left and right guide. The screw assembly 41 of the driving mechanism 4 is connected to the sliding column 3, and the nut 432 is connected to the side support plate 11, so that the driving mechanism 4 moves up and down together with the sliding column 3.

Referring to fig. 2 to 5, the oral CBCT apparatus 100 is assembled such that the sliding column 3 is connected to a cantilever and a side arm (not shown) at the top thereof to move the photographing function module up and down. The guide assembly 2 is composed of a guide rod 21, a first rubber-covered bearing (a first rolling member 221), a first connecting shaft 222, a second rubber-covered bearing (a second rolling member 231), a second connecting shaft 233, an adjusting washer 234 and a support 232. The first rubber-covered bearing and the first connecting shaft 222 are matched and respectively arranged at the upper end and the lower end of the guide rod 21, the tail end of the first connecting shaft 222 is provided with a threaded hole and is arranged at the two inner sides of the side support plate 11, the second rubber-covered bearing and the second connecting shaft 233 are matched and arranged on the support 232, the interval is adjusted by the adjusting gasket 234, and the support 232 penetrates through the rubber cushion block 235 and is arranged on the guide rod 21. The assembled relationship is shown in fig. 6 and 9.

Referring to fig. 3 and 4, the sliding column 3 is subjected to both front and rear and left and right moments, and the upper and lower first rubber coating bearings are in contact with the front and rear rolling surfaces (the front side wall and the rear side wall of the sliding chute 31) of the sliding column 3 to realize front and rear guiding of the sliding column. The two second encapsulated bearings are in contact with the side rolling surfaces (bottom wall of the runner 31) to achieve lateral guidance. The outer surface materials of the first rubber-covered bearing and the second rubber-covered bearing are POM or nylon and other wear-resistant plastics.

Before assembly, the minimum distance between the second rubber coating bearings of the two guide assemblies 2 on the left side and the right side of the side supporting plate 11 is smaller than the distance between the left rolling surface and the right rolling surface of the sliding column 3 (the bottom wall of the sliding chute 31). By utilizing the elastic deformation of the rubber cushion block 235, the second rubber-coated bearing generates pre-pressure on the side rolling surface after assembly. Therefore, the stability of the sliding column 3 can be kept, and meanwhile, deformation generated by side position moment can be offset by adjusting the upper and lower interference amount of the second rubber-coated bearing. At the same time, the tolerance requirement for the lateral spacing of the sliding posts 3 is reduced.

The utility model discloses guiding mechanism can carry out the spacing direction around the post 3 that slides simultaneously and control. Meanwhile, the structure characteristics of the device enable the device to meet the requirements on installation accuracy, the tolerance is large, the flexibility is strong, rolling friction is generated at all sides, the friction coefficient is small, and the cost is lower.

According to the driving mechanism 4 for the oral CBCT apparatus 100 of the present invention, as shown in fig. 1, 10 and 11, the driving assembly 42 is mounted on the sliding column 3, and the nut assembly 43 is mounted on the column.

The driving motor 422 with speed reducer drives the lead screw 411 to rotate through the coupling 423. The lead screw assembly 41 comprises a lead screw 411, a flexible supporting component 413 and a rigid supporting component 412, wherein a flexible bearing seat 4131 of the flexible supporting component 413 is made of rubber, and a second bushing 4132 is an oil-free bushing and is arranged on the flexible bearing seat 4131 to support the upper shaft of the lead screw 411. The rigid bearing housing 4121 of the rigid support member 412 is made of metal, and the lead screw 411 passes through the adjusting ring 4125, the thrust bearing 4122, the first bushing 4123, the thrust bearing 4122, respectively, and is locked with the locknut 432, as shown in fig. 10 and 11. At this time, the rigid bearing housing 4121 functions as an axial bearing support. Since there is a small gap between the lower shaft of the lead screw 411 and the first bushing 4123, the upper bearing seat connected to the upper end is made of rubber material and has a certain flexibility. Thus, the lead screw 411 may swing slightly rather than being completely rigidly connected.

As shown in fig. 11, the nut assembly 43 includes: the nut support 431 is installed on the side support plate 11, the nut support 431 is provided with a shaft hole 4311, and the rotating shaft 433 with a shaft shoulder 4332 penetrates through the shaft hole 4311 and is axially limited by a shaft end retainer ring. The middle of the rotating shaft 433 is provided with a nut connecting hole 4331, and the copper nut 432 passes through the nut connecting hole 4331 to be fixedly connected in a threaded manner, so that the copper nut 432 can rotate in the shaft hole 4311 of the nut bracket 431 along with the rotating shaft 433.

In actual operation, the sliding column 3 is guided forwards, backwards, leftwards and rightwards by the guide assembly 2. However, the first rubber-covered bearing (the first rolling element 221) and the second rubber-covered bearing (the second rolling element 231) of the guide assembly 2 have errors in size and assembly with the matched rolling surfaces (the front side wall, the rear side wall and the bottom wall of the chute 31), and the lead screw 411 has errors in size and assembly with the matched sliding column 3, so that the guide axis and the axis of the lead screw 411 cannot be guaranteed to be parallel, and even the included angle of the axes can be changed at different lifting heights. And during long-term use, the rubber-covered bearings (the first rolling element 221 and the second rolling element 231) are worn, resulting in a change in the angle between the guide axis and the axis of the screw 411. Therefore, in the oral cavity CBCT apparatus 100 of the present embodiment, the copper nut 432 can be adapted to swing along the axis of the lead screw 411 to keep coaxial. Therefore, the screw 411 and the copper nut 432 are in threaded fit, the meshing area is the largest, the pressure intensity is the smallest, the transmission efficiency is the highest, and the situations of vibration abnormal sound and the like can not occur.

According to the utility model discloses oral cavity CBCT device 100, actuating mechanism 4's motor and lead screw 411 dress are along with sliding column 3 up-and-down motion on sliding column 3, and nut 432 of being connected with collateral branch board 11 has the swing degree of freedom, and lead screw 411 has certain front and back degree of freedom simultaneously in addition, and from this, can guarantee that nut 432 and lead screw 411 are coaxial along the direction of direction, avoid lead screw 411 and nut 432 meshing partial pressure too big, avoid nut 432 accelerated wear and the vibration abnormal sound that arouses.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (23)

1. A drive mechanism for an oral CBCT apparatus, comprising:

a screw assembly, the screw assembly comprising:

a screw rod extending in an up-down direction,

a rigid support member connected to the lower end of the lead screw for supporting the lower end of the lead screw,

the flexible supporting component is connected with the upper end of the screw rod and is used for supporting the upper end of the screw rod; a nut assembly, the nut assembly comprising:

a nut bracket is arranged on the upper portion of the frame,

the nut is arranged on the nut bracket in a swinging mode around an axis extending along the horizontal direction and sleeved on the screw rod;

and the driving assembly is connected with the screw rod and is used for driving the screw rod to rotate so as to be in threaded engagement with the nut.

2. The drive mechanism for an oral CBCT apparatus of claim 1, wherein the lower end of the screw rod is formed with a first support portion, the rigid support member is sleeved on the first support portion, the rigid support member comprises:

the bearing mounting hole is formed in the rigid bearing seat;

the thrust bearing is arranged in the bearing mounting hole, and the thrust bearing is sleeved on the first supporting part.

3. The drive mechanism for an oral CBCT apparatus of claim 2, wherein said thrust bearing comprises two, said rigid support member further comprising: the first bushing is sleeved on the first supporting part and located between the two thrust bearings.

4. The drive mechanism for an oral CBCT apparatus of claim 2, wherein said rigid support member further comprises: and the locknut is in threaded connection with the free end of the first supporting part.

5. The drive mechanism for an oral CBCT apparatus of claim 2, wherein said rigid support member further comprises: the adjusting ring is sleeved on the first supporting part and is abutted against the upper surface of the thrust bearing.

6. The driving mechanism for the oral CBCT apparatus as recited in claim 1, wherein a second supporting portion is formed at an upper end of the screw rod, the flexible supporting member is sleeved on the second supporting portion, and the flexible supporting member comprises:

the flexible bearing seat is provided with a lining mounting hole;

the second bushing is arranged in the bushing mounting hole, and the second bushing is sleeved on the second supporting part.

7. The drive mechanism for an oral CBCT apparatus of claim 1, wherein said drive assembly comprises:

a motor bracket;

the driving motor is arranged on the motor bracket and is provided with a driving shaft;

and the coupler is in transmission connection with the driving shaft and the screw rod respectively.

8. The drive mechanism for an oral CBCT apparatus according to any of claims 1 to 7, wherein the nut bracket is formed with a shaft hole penetrating therethrough in a left-right direction, the nut assembly further comprising: the rotating shaft is rotatably arranged in the shaft hole, and the nut is fixed on the rotating shaft.

9. The drive mechanism for the oral CBCT apparatus of claim 8, wherein the shaft is formed with a nut coupling hole extending perpendicular to the axis of the shaft, and the nut extends into the nut coupling hole to be threadedly coupled with the shaft.

10. The drive mechanism for an oral CBCT apparatus of claim 8, wherein an axial end of said spindle is formed with a shoulder, said nut assembly further comprising: the shaft end blocking piece is connected to the other end of the rotating shaft, and the shaft shoulder and the shaft end blocking piece are respectively abutted to the peripheries of the two axial ends of the shaft hole.

11. An oral CBCT apparatus, comprising:

a base frame;

a drive mechanism for an oral CBCT apparatus according to any of claims 1 to 10;

a slide column connected to one of the screw and the nut, the other of the screw and the nut being fixed to the base frame, the screw-nut driving mechanism being configured to drive the slide column to be movable in an up-down direction with respect to the base frame;

a guide assembly connected between the sliding column and the base frame for guiding the sliding column.

12. The oral CBCT apparatus of claim 11, wherein the guide assembly comprises:

the guide rod extends along the up-down direction and is fixed on the base frame;

a first rolling member disposed on the guide bar, the first rolling member comprising: a first rolling member rotatable about a first axis extending in a left-right direction;

a second rolling member disposed on the guide bar, the second rolling member comprising: a second rolling member rotatable about a second axis extending in the front-rear direction;

the sliding column is provided with a sliding groove extending along the vertical direction, and the first rolling piece and the second rolling piece are both rotatably arranged in the sliding groove and abutted against the inner wall of the sliding groove.

13. The oral CBCT apparatus of claim 12, wherein said first rolling component further comprises: the first rolling part is sleeved on the first connecting shaft, the guide rod is provided with a connecting hole, and the first connecting shaft is fixedly connected with the guide rod through the connecting hole.

14. The oral CBCT device of claim 13, wherein the free end of the first connecting shaft passes through the connecting hole and is threadedly connected to the base frame.

15. The oral CBCT apparatus of claim 12, wherein said second rolling component further comprises:

the support is fixed on the guide rod, an accommodating groove facing the bottom wall opening of the sliding groove is formed in the support, the second rolling piece is rotatably arranged in the accommodating groove, and part of the second rolling piece extends out of the opening of the accommodating groove.

16. The oral CBCT device of claim 15, wherein the holder is formed with a through hole penetrating the receiving groove in a front-rear direction, the second rolling member further comprising: the second connecting shaft penetrates through the through hole and is fixed on the support, and the second rolling piece is sleeved on the second connecting shaft.

17. The oral CBCT apparatus of claim 16, wherein said second rolling member further comprises an adjustment pad, said adjustment pad is disposed on said second connecting shaft and between said second rolling member and a sidewall of said receiving groove.

18. The oral CBCT apparatus of claim 15, wherein said second rolling component further comprises: the rubber cushion block is fixed on the guide rod, and the support is connected with the rubber cushion block.

19. The oral CBCT apparatus of any one of claims 12 to 18, wherein the first rolling member comprises a plurality of first rolling members, the plurality of first rolling members being spaced apart along a length of the guide bar; and/or

The second rolling parts comprise a plurality of second rolling parts which are arranged at intervals along the length direction of the guide rod.

20. The oral CBCT device of any of claims 12 to 18, wherein the first and second rolling elements are both encapsulated bearings.

21. The oral CBCT apparatus of claim 12, wherein the base frame is provided with side support plates extending in a vertical direction, the side support plates having a first plate portion and a second plate portion, the first plate portion and the second plate portion extending in a front-rear direction and being spaced apart and opposed in a left-right direction,

the guide assembly comprises two guide assemblies, the two guide assemblies are respectively connected with the first plate part and the second plate part, the sliding column is arranged between the first plate part and the second plate part, and the sliding column is provided with two sliding grooves in one-to-one correspondence with the two guide assemblies.

22. The oral CBCT device of claim 21, wherein the side brackets further have a web portion extending in a side-to-side direction and connected between a rear end of the first web portion and a rear end of the second web portion.

23. The oral CBCT apparatus of claim 12, wherein the second rolling member is an adhesive-coated member,

when the sliding column is not assembled, the minimum distance between the second rolling piece of the guide assembly on the left side and the second rolling piece of the guide assembly on the right side in the horizontal direction is d 1; the distance between the bottom wall of the sliding chute on the left side of the sliding column and the bottom wall of the sliding chute on the right side of the sliding column in the horizontal direction is d 2;

wherein d1 and d2 satisfy: d1 is less than d 2.

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