Calibrating device for oral digital impression instrument

Abstract

The utility model provides an oral digital impression instrument calibration device, and relates to the technical field of calibration. The calibration device for the oral digital impression instrument comprises a shell, a driving mechanism, a distance measuring mechanism and a calibration plate, wherein the shell is provided with an assembly hole for inserting a main body of the oral digital impression instrument; the driving mechanism, the distance measuring mechanism and the calibration plate are all located in the machine shell, the driving mechanism is connected with the calibration plate and used for driving the calibration plate to rotate around the preset axis while sliding in the extension direction of the preset axis, and the distance measuring mechanism is used for measuring the movement distance of the calibration plate in the extension direction of the preset axis. According to the device, the automation degree of the calibration step can be improved, the calibration efficiency is improved, and the calibration precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of calibration, in particular to a calibration device for an oral digital impression instrument. Background Art

[0002] The oral digital impression device is a common oral examination tool. Its basic principle is to use computer digital image processing technology to obtain accurate impressions of teeth, gums and other oral tissues to obtain oral information such as tooth arrangement, occlusion, and oral soft tissue conditions. The oral digital impression device is mainly composed of software and hardware equipment, including computers, printers, digital measurement equipment, image acquisition equipment, etc. When in use, the doctor puts the image acquisition device of the oral digital impression device into the patient's mouth, takes a digital impression of the oral cavity through the image acquisition device, and then transmits the digital signal to the computer for processing to generate a digital oral model. The doctor makes a diagnosis and treatment plan based on the model. Long-term use of the oral digital impression device will cause small displacements of the precision components inside the oral digital impression device, thereby affecting the accuracy of the oral digital impression device during three-dimensional scanning.

[0003] The inventors have found that the prior art method for calibrating an oral digital impression device has at least the following disadvantages:

[0004] Manual calibration is labor-intensive, inefficient, and has large errors. Utility Model Content

[0005] The utility model aims to provide a calibration device for an oral digital impression instrument, which can improve the automation degree of the calibration steps, improve the calibration efficiency and improve the calibration accuracy.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a calibration device for an oral digital impression instrument, comprising:

[0008] A housing, a driving mechanism, a distance measuring mechanism and a calibration plate, wherein the housing is provided with an assembly hole for plugging in the main body of the oral digital impression instrument; the driving mechanism, the distance measuring mechanism and the calibration plate are all located in the housing, the driving mechanism is connected to the calibration plate, and is used to drive the calibration plate to slide in the extension direction of the preset axis and rotate around the preset axis at the same time, and the distance measuring mechanism is used to measure the distance moved by the calibration plate along the extension direction of the preset axis.

[0009] In an optional embodiment, a limiting structure for abutting against a main body of the oral digital impression device is provided on the housing to limit a depth of the oral digital impression device inserted into the housing.

[0010] Based on the above scheme, when calibration operation is required, the main body of the oral digital impression instrument is inserted into the assembly hole, and the limiting mechanism cooperates with the main body of the oral digital impression instrument to limit the insertion depth of the oral digital impression instrument, which not only ensures the matching accuracy between the main body of the oral digital impression instrument and the casing, but also reduces the assembly difficulty and improves the assembly efficiency.

[0011] In an optional embodiment, the driving mechanism includes a motor and a screw transmission assembly, the motor and the screw transmission assembly cooperate, the screw transmission assembly is connected to the calibration plate, and the motor is used to drive the calibration plate to slide in the extension direction of the preset axis through the screw transmission assembly while rotating circumferentially around the preset axis.

[0012] Based on the above scheme, after the motor is started, the calibration plate can be driven to move through the lead screw transmission assembly, which is easy to operate, and the lead screw transmission assembly has good structural stability, so that the calibration plate moves smoothly and reliably, and the movement position is accurate and reliable, which is conducive to improving the accuracy of the calibration result. When adjusting the position of the calibration plate, the angle of rotation of the motor and the distance parameters obtained by the distance measuring mechanism are used to accurately locate the position of the calibration plate. That is, the angle of rotation of the motor corresponds to the distance the calibration plate moves forward or backward. When the motor rotates to a set angle, the distance measuring mechanism can obtain the distance the calibration plate moves forward or backward at this time. In this way, the angle of rotation of the motor can be inferred from the data obtained by the measuring mechanism, so as to obtain whether the position of the calibration plate is accurate.

[0013] In an optional embodiment, the screw transmission assembly includes a guide sleeve, a threaded sleeve and a screw body, the guide sleeve is connected to the output shaft of the motor, the threaded sleeve is connected to the guide sleeve, the screw body is inserted into the guide sleeve and the threaded sleeve at the same time, the screw body and the guide sleeve are slidably matched in the extension direction of the preset axis, and the two are relatively fixed in the circumferential direction of the preset axis; the screw body is threadedly connected to the threaded sleeve; the calibration plate is connected to the end of the screw body away from the motor.

[0014] Based on the above scheme, the threaded sleeve is a static part, which is installed in the casing and fixed relative to the casing. After the motor is started, it drives the guide sleeve to rotate, and the lead screw body rotates together with the guide sleeve. The lead screw body is threadedly connected with the threaded sleeve, so that the lead screw body can move forward and backward while rotating, thereby adjusting the position of the calibration plate.

[0015] In an optional embodiment, the guide sleeve is provided with a guide hole with a non-circular cross-section, the screw body includes a connected guide rod and a threaded rod, the guide rod has a non-circular cross-section, the guide rod is plug-fitted with the guide hole, the threaded rod is threadedly fitted with the threaded sleeve, and the calibration plate is mounted on the threaded rod.

[0016] Based on the above scheme, the guide hole can be a square hole, etc., and correspondingly, the guide rod is a square rod. The two have a simple structure, are easy to assemble, and fit tightly. While ensuring synchronous rotation, they can also slide relative to each other to meet the position adjustment of the calibration plate.

[0017] In an optional embodiment, a positioning hole is provided at the end of the guide sleeve, the output shaft of the motor is inserted into the positioning hole, and the output shaft is detachably connected to the positioning hole.

[0018] Based on the above scheme, the output shaft is inserted into the positioning hole, the output shaft of the motor and the guide sleeve have high coaxiality and tight fit, and the rotation of the guide sleeve is stable and reliable.

[0019] In an optional embodiment, a locking screw is provided on the guide sleeve, and an end of the locking screw extends into the positioning hole and abuts against the outer circumferential surface of the output shaft.

[0020] Based on the above scheme, after the output shaft is inserted into the assembly hole, the output shaft and the guide sleeve are locked by the locking screw to improve the firmness of the combination of the output shaft and the guide sleeve. When maintenance or overhaul is required, the locking screw is loosened to facilitate the output shaft to be pulled out of the positioning hole of the guide sleeve, which makes disassembly and assembly convenient.

[0021] In an optional embodiment, the oral digital impression instrument calibration device further includes an alarm module, which is electrically connected to the distance measuring mechanism, and is configured to issue a prompt when a distance parameter acquired by the distance measuring mechanism exceeds a threshold value.

[0022] Based on the above scheme, during the process of adjusting the calibration plate, when an incorrect operation occurs, that is, when the distance of the calibration plate relative to the main body of the oral digital impression instrument exceeds the threshold, it indicates that the position of the calibration plate is too far or too close, which will affect the accuracy of the calibration result in this state. At this time, the alarm module will issue an alarm in time to prompt the operator to check the equipment, or directly shut down the equipment, etc., to reduce the failure rate.

[0023] In an optional embodiment, the distance measuring mechanism is configured as a laser distance measuring module, an infrared distance measuring module or an ultrasonic distance measuring module.

[0024] Based on the above scheme, the types of distance measuring mechanisms are diverse, can be selected as needed, and are flexible to use.

[0025] In an optional embodiment, the casing is configured as a split structure.

[0026] Based on the above solution, the housing has a simple structure, is easy to manufacture, and has low cost. In addition, when assembling, the housing is in a separated state, which is convenient for assembling other components into the housing, and the assembly difficulty is low and the assembly efficiency is high.

[0027] The beneficial effects of the embodiments of the utility model are:

[0028] In summary, the calibration device for the oral digital impression instrument provided in this embodiment, when the main body of the oral digital impression instrument needs to be calibrated, the main body of the oral digital impression instrument is inserted into the assembly hole, and the position of the main body of the oral digital impression instrument is adjusted to make it fit closely with the casing. Start the calibration device, the distance measuring mechanism can obtain the distance between the calibration plate and the distance measuring mechanism at the initial time, and by starting the driving mechanism, the calibration plate is driven to rotate while approaching or moving away from the main body of the oral digital impression instrument. In the process of the position change of the calibration plate, the distance measuring mechanism can obtain the distance moved by the calibration plate in real time. Since the forward or backward distance of the calibration plate when it rotates one circle is certain, the angle of rotation of the calibration plate can be obtained by the distance obtained by the distance measuring mechanism, so as to adjust the angle of the calibration plate relative to the main body of the oral digital impression instrument, which is beneficial to the calibration operation in different scenes. The whole calibration process has a high degree of automation, convenient operation, high efficiency, and less participation, small error, and high accuracy of the calibration result. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a calibration device for an oral digital impression instrument according to an embodiment of the present utility model;

[0031] Figure 2 This is an exploded schematic diagram of a calibration device for an oral digital impression instrument according to an embodiment of the utility model;

[0032] Figure 3 It is a cross-sectional schematic diagram of the calibration device of the oral digital impression instrument and the main body of the oral digital impression instrument according to an embodiment of the utility model.

[0033] icon:

[0034] 001-main body of oral digital impression instrument; 100-housing; 110-upper shell; 120-lower shell; 130-chamber; 140-assembly hole; 150-limiting structure; 200-driving mechanism; 210-motor; 220-screw transmission assembly; 221-guide sleeve; 222-threaded sleeve; 223-screw body; 300-distance measuring mechanism; 400-calibration plate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example

[0042] This embodiment provides a calibration device for an oral digital impression instrument, which has a high degree of automation, is easy to operate, and has high accuracy in calibration results.

[0043] Please combine Figure 1-Figure 3 In this embodiment, the calibration device of the oral digital impression instrument includes a housing 100, a driving mechanism 200, a distance measuring mechanism 300 and a calibration plate 400. The housing 100 is provided with an assembly hole 140 for plugging the oral digital impression instrument body 001; the driving mechanism 200, the distance measuring mechanism 300 and the calibration plate 400 are all located in the housing 100, and the driving mechanism 200 is connected to the calibration plate 400, and is used to drive the calibration plate 400 to slide in the extension direction of the preset axis and rotate around the preset axis at the same time, and the distance measuring mechanism 300 is used to measure the distance moved by the calibration plate 400 along the extension direction of the preset axis.

[0044] Based on the above solution, the use of the oral digital impression instrument calibration device provided in this embodiment includes, for example:

[0045] Insert the main body 001 of the oral digital impression instrument into the assembly hole 140, and adjust the position of the main body 001 of the oral digital impression instrument to make it fit closely with the housing 100. Start the calibration device, the distance measuring mechanism 300 can obtain the distance between the calibration plate 400 and the distance measuring mechanism 300 at the initial stage, and by starting the driving mechanism 200, the calibration plate 400 is driven to rotate while approaching or moving away from the main body 001 of the oral digital impression instrument. During the process of the position change of the calibration plate 400, the distance measuring mechanism 300 can obtain the distance moved by the calibration plate 400 in real time. Since the distance of the calibration plate 400 moving forward or backward is certain after one rotation, the angle of rotation of the calibration plate 400 can be obtained by the distance obtained by the distance measuring mechanism 300, so as to adjust the angle of the calibration plate 400 relative to the main body 001 of the oral digital impression instrument, which is conducive to the calibration operation in different scenes. The whole calibration process has a high degree of automation, convenient operation, high efficiency, less participation, small error, and high accuracy of the calibration result.

[0046] It should be understood that the power-consuming devices in the calibration device can be connected to the external mains via a power adapter and powered by the mains, or the calibration device itself has an independent power supply and is powered by its own independent power supply.

[0047] The following embodiments illustrate the details of the oral digital impression device calibration device provided by the present application by way of examples.

[0048] In this embodiment, the calibration device of the oral digital impression instrument includes a housing 100, a driving mechanism 200, a distance measuring mechanism 300, a calibration plate 400 and an alarm module (not shown). The driving mechanism 200, the distance measuring mechanism 300 and the calibration plate 400 are all installed in the housing 100, and the alarm module can be installed on the surface of the housing 100, exposed, so that the emitted sound and light prompts can be obtained by the operator.

[0049] Optionally, the housing 100 is configured as a split structure. Specifically, the housing 100 includes an upper shell 110 and a lower shell 120. The upper shell 110 and the lower shell 120 are connected, and the connection position between the two can be locked by fasteners such as buckles or screws. After the upper shell 110 and the lower shell 120 are matched, a chamber 130 for accommodating the driving mechanism 200, the distance measuring mechanism 300 and the calibration plate 400 can be defined. Since the housing 100 is configured as a split structure, it is convenient for processing and manufacturing, and easy to assemble. At the same time, after the upper shell 110 and the lower shell 120 are matched, the ends of the two define an assembly hole 140 that connects the chamber 130, and the assembly hole 140 is used for the main body 001 of the oral digital impression instrument to be calibrated to be plugged in and positioned.

[0050] Furthermore, a limiting structure 150 that cooperates with the oral digital impression instrument body 001 can be provided in the housing 100, which can control the insertion depth of the oral digital impression instrument body 001, quickly locate the position of the oral digital impression instrument body 001, facilitate assembly, save time and effort, and improve calibration efficiency. The limiting structure 150 can form a concave-convex snap-fitting structure with the oral digital impression instrument body 001 to improve stability.

[0051] In this embodiment, optionally, the driving mechanism 200 includes a motor 210 and a screw transmission assembly 220. The motor 210 and the screw transmission assembly 220 cooperate, and the screw transmission assembly 220 is connected to the calibration plate 400. The motor 210 is used to drive the calibration plate 400 to slide in the extension direction of the preset axis through the screw transmission assembly 220 while rotating circumferentially around the preset axis. When in use, after the motor 210 is started, the calibration plate 400 can be driven to move through the screw transmission assembly 220, which is easy to operate, and the screw transmission assembly 220 has good structural stability, so that the calibration plate 400 moves smoothly and reliably, and the movement position is accurate and reliable, which is conducive to improving the accuracy of the calibration result. When adjusting the position of the calibration plate 400, the angle of rotation of the motor 210 and the distance parameter obtained by the distance measuring mechanism 300 are used to achieve accurate positioning of the position of the calibration plate 400. That is, the rotation angle of the motor 210 corresponds to the distance that the calibration plate 400 moves forward or backward. When the motor 210 rotates to the set angle, the distance measuring mechanism 300 can obtain the distance that the calibration plate 400 moves forward or backward at this time. In this way, the rotation angle of the motor 210 can be inferred through the data obtained by the measuring mechanism, thereby obtaining whether the position of the calibration plate 400 is accurate.

[0052] It should be noted that the motor 210 may be a DC motor 210 or a stepping motor 210 or the like.

[0053] Please combine Figure 1 and Figure 3 Optionally, the screw transmission assembly 220 includes a guide sleeve 221, a threaded sleeve 222 and a screw body 223. The guide sleeve 221 is connected to the output shaft of the motor 210. The threaded sleeve 222 is connected to the guide sleeve 221 and the two are coaxially arranged. The axes of the threaded sleeve 222 and the guide sleeve 221 coincide with the preset axis. The screw body is inserted into the guide sleeve 221 and the threaded sleeve 222 at the same time. The screw body 223 and the guide sleeve 221 are slidably matched in the extension direction of the preset axis, and the two are relatively fixed in the circumferential direction of the preset axis; the screw body 223 is screwed to the threaded sleeve 222; and the calibration plate 400 is connected to the end of the screw body 223 away from the motor 210. The distance measuring mechanism 300 is arranged on the side of the calibration plate 400 close to the motor 210, that is, taking the viewing angle in the figure as a reference, the distance measuring mechanism 300 is located on the left side of the calibration plate 400, and the distance measuring mechanism 300 can obtain the distance between the distance measuring mechanism 300 and the calibration plate 400.

[0054] It should be understood that when in use, after the motor 210 is started, it drives the guide sleeve 221 to rotate, and the guide sleeve 221 will not slide in the extension direction of the preset axis relative to the housing 100. The screw body rotates together with the guide sleeve 221, and the screw body is threadedly connected to the threaded sleeve 222, so that the screw body can move forward and backward while rotating, thereby adjusting the position of the calibration plate 400.

[0055] Optionally, the guide sleeve 221 is provided with a guide hole with a non-circular cross section, the lead screw body 223 includes a connected guide rod and a threaded rod, the guide rod has a non-circular cross section, the guide rod is plug-fitted with the guide hole, the threaded rod is threadedly fitted with the threaded sleeve 222, and the calibration plate 400 is mounted on the threaded rod. For example, in one embodiment, the guide hole can be a square hole, etc., and correspondingly, the guide rod is a square rod, the two have a simple structure, are easy to assemble, and are tightly matched. On the premise of ensuring synchronous rotation, they can also slide relative to each other to meet the position adjustment of the calibration plate 400.

[0056] Furthermore, a positioning hole is provided at the left end of the guide sleeve 221, and a fastening screw is provided on the guide sleeve 221, and the end of the fastening screw can extend into the positioning hole, and the positioning hole can be a round hole, etc. The output shaft of the motor 210 is inserted into the positioning hole, and then the fastening screw is screwed to make its end abut against the outer circumference of the output shaft, thereby locking the output shaft and the guide sleeve 221, and improving the firmness of the connection between the two.

[0057] In this embodiment, optionally, the distance measuring mechanism 300 may be a laser distance measuring module, an infrared distance measuring module or an ultrasonic distance measuring module.

[0058] In this embodiment, optionally, the alarm module may include a speaker and a flash light, etc. The alarm module, motor 210, ranging mechanism 300, etc. may be electrically connected to the control system of the calibration device. When the alarm module sounds an alarm, the control system may also directly control the motor 210 to stop working, thereby reducing the failure rate.

[0059] The oral digital impression instrument calibration device provided in this embodiment has at least the following advantages:

[0060] 1. By setting the distance measuring mechanism 300, after the calibration device is started, the position information of the calibration plate 400 can be obtained and can be quickly reset, thereby improving the calibration speed of the product;

[0061] 2. During the calibration process, the position information of the calibration plate 400 can be obtained to determine whether the calibration plate 400 exceeds the working range. When the position of the calibration plate 400 exceeds the threshold, the motor 210 can be stopped in time so that it does not drive the calibration plate 400 to rotate, thereby reducing the risk of product damage;

[0062] 3. During the calibration process, the distance that the calibration plate 400 moves each time can be measured, and the rotation angle of the calibration plate 400 can be closed-looped to improve the accuracy of the rotation angle of the calibration plate 400, thereby improving the accuracy of the calibration of the oral digital impression instrument.

[0063] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A calibration device for an oral digital impression instrument, characterized in that: include: A housing (100), a driving mechanism (200), a distance measuring mechanism (300) and a calibration plate (400); the housing (100) is provided with an assembly hole (140) for plugging in a main body (001) of an oral digital impression instrument; the driving mechanism (200), the distance measuring mechanism (300) and the calibration plate (400) are all located in the housing (100); the driving mechanism (200) is connected to the calibration plate (400) and is used to drive the calibration plate (400) to slide in the extension direction of a preset axis and rotate around the preset axis; the distance measuring mechanism (300) is used to measure the distance moved by the calibration plate (400) along the extension direction of the preset axis.

2. The oral digital impression instrument calibration device according to claim 1, characterized in that: The housing (100) is provided with a limiting structure (150) for abutting against the main body (001) of the oral digital impression device, so as to limit the depth of the oral digital impression device inserted into the housing (100).

3. The oral digital impression instrument calibration device according to claim 1, characterized in that: The driving mechanism (200) comprises a motor (210) and a lead screw transmission assembly (220), wherein the motor (210) and the lead screw transmission assembly (220) cooperate with each other, and the lead screw transmission assembly (220) is connected to the calibration plate (400). The motor (210) is used to drive the calibration plate (400) to slide in the extension direction of the preset axis and to rotate circumferentially around the preset axis through the lead screw transmission assembly (220).

4. The oral digital impression instrument calibration device according to claim 3, characterized in that: The screw transmission assembly (220) includes a guide sleeve (221), a threaded sleeve (222) and a screw body (223); the guide sleeve (221) is connected to the output shaft of the motor (210); the threaded sleeve (222) is connected to the guide sleeve (221); the screw body is inserted into the guide sleeve (221) and the threaded sleeve (222) at the same time; the screw body (223) and the guide sleeve (221) are slidably matched in the extension direction of the preset axis, and the two are relatively fixed in the circumferential direction of the preset axis; the screw body (223) and the threaded sleeve (222) are threadedly connected; and the calibration plate (400) is connected to the end of the screw body (223) away from the motor (210).

5. The oral digital impression instrument calibration device according to claim 4, characterized in that: The guide sleeve (221) is provided with a guide hole with a non-circular cross section, and the screw body (223) includes a connected guide rod and a threaded rod, the cross section of the guide rod is non-circular, the guide rod is plug-fitted with the guide hole, the threaded rod is threadedly fitted with the threaded sleeve (222), and the calibration plate (400) is installed on the threaded rod.

6. The oral digital impression device calibration device according to claim 4, characterized in that: A positioning hole is provided at the end of the guide sleeve (221), and the output shaft of the motor (210) is inserted into the positioning hole, and the output shaft is detachably connected to the positioning hole.

7. The oral digital impression device calibration device according to claim 6, characterized in that: The guide sleeve (221) is provided with a locking screw, and the end of the locking screw extends into the positioning hole and abuts against the outer peripheral surface of the output shaft.

8. The oral digital impression device calibration device according to claim 1, characterized in that: The oral digital impression instrument calibration device further comprises an alarm module, the alarm module being electrically connected to the distance measuring mechanism (300), and the alarm module being used to issue a prompt when a distance parameter acquired by the distance measuring mechanism (300) exceeds a threshold value.

9. The oral digital impression instrument calibration device according to claim 1, characterized in that: The distance measuring mechanism (300) is configured as a laser distance measuring module, an infrared distance measuring module or an ultrasonic distance measuring module.

10. The oral digital impression instrument calibration device according to claim 1, characterized in that: The housing (100) is configured as a split structure.

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