Hot pressing film heating and pressure maintaining device

Abstract

The utility model discloses a hot-pressing film heating and pressure-maintaining device, which is used for a hot-pressing film production process of an invisible orthodontic appliance and comprises a pressure-maintaining bowl, a heating piece and a pressurizing hole, the heating piece and the pressurizing hole are arranged in the pressure-maintaining bowl, the pressure-maintaining bowl is used for pressurizing a heated film, and one side of the pressure-maintaining bowl facing the film to be pressed is of an opening structure; the heating piece is used for heating the membrane so as to soften the membrane, and the heating piece is arranged on the side, away from the opening structure, in the pressure maintaining bowl; the pressurizing hole is communicated with a pressurizing device and is used for pressurizing the softened membrane so that the membrane can be pressed on the dental model to be formed, and the pressurizing hole is formed in the inner side wall of the pressure maintaining bowl and located below the heating piece.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the dental orthodontic technical field, more exactly, relate to dental instrument manufacturing technology, especially, relate to a kind of hot-pressing film heating pressure maintaining device. BACKGROUND

[0002] In the field of dental orthodontics, due to the advantages of aesthetics, convenience and ease of cleaning, invisible aligners based on high molecular materials are becoming increasingly popular. Invisible aligners are usually integrated shells that form cavities to accommodate multiple teeth, and the geometry of the cavities is basically consistent with the teeth in the corresponding layout. Currently, in the automated processing of invisible aligners, the hot-pressing film process is particularly important. In this process, the film is heated, and after heating, it is placed on the dental model, covered with a pressure maintaining structure, inflated and pressurized to complete the hot-pressing film.

[0003] Currently, in the hot-pressing film process of the automated production process of invisible aligners, the following method is usually used: first, preheat the heating element to a set preheating temperature, automatically place the film above the heating element, then press the film down with the upper mold cavity, and control the heating element to continue heating for a set period of time; then move the heating element below the film away with a pneumatic cylinder, and move the bearing disc with the dental model to the position below the film; then control the bearing disc with the dental model to rise up to the position of the film with a jacking pneumatic cylinder, at this time, the upper mold cavity starts to blow air to maintain pressure, so that the film and the dental model fit to form an uncut shell, and finally the invisible aligner is obtained by cutting and trimming. However, this method has the following problems: (1) since the heating element is exposed to the external environment, the temperature needs to reach 300℃ or above to ensure that the film and the dental model fit after pressing, but too high a temperature will cause the shell to be formed with uneven thickness and decreased mechanical properties, resulting in the formed invisible aligner being easily torn and damaged; (2) since the heating element is installed below the film, and the dental model also needs to be lifted from below the film, the two need to avoid each other. Therefore, after the heating element has heated the film, the heating element must be moved away, at this time the temperature of the film will drop rapidly, resulting in the film with sudden temperature drop not being able to completely fit the dental model, thereby affecting the product quality of the invisible aligner and not achieving the expected treatment effect.

[0004] Therefore, it is necessary to provide an improved hot-pressing film heating pressure maintaining device. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem of overcoming the defects of the prior art, and provides a hot-pressing film heating pressure maintaining device, which can reduce the influence of the external environment on the temperature of the film, help maintain the temperature in the pressure bowl, improve the efficiency of the hot-pressing film process, and reduce the manufacturing cost of the invisible aligner.

[0006] In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

[0007] A kind of hot-pressing film heating pressure maintaining device, for the hot-pressing film production process of invisible orthodontic appliance, including pressure maintaining bowl, and heating piece and pressurizing hole being set to the inside of the pressure maintaining bowl, wherein, the pressure maintaining bowl is used to pressurize film piece after heating ends, and the side of the pressure maintaining bowl towards the film piece to be pressed is open structure;The heating piece is used to heat film piece, so that the film piece softens, and the heating piece is set to the inside of the pressure maintaining bowl away from the side of the open structure;The pressurizing hole is communicated with a pressurizing device and is set, and is used to pressurize the softened film piece, so that the film piece is pressed and covered on dental model and is shaped, and the pressurizing hole is set on the inner side wall of the pressure maintaining bowl and is located below the heating piece.

[0008] Preferably, when the film piece is pressed and covered on the dental model and is shaped, the side of the heating piece towards the film piece is set with a preset distance from the film piece, wherein the preset distance is 20mm-50mm.

[0009] Preferably, the top inner side wall of the side of the pressure maintaining bowl away from the open structure is provided with a plurality of fixing portions for fixing the heating piece, the fixing portion includes a clamping assembly for clamping the heating piece and a fixing support for mounting the clamping assembly, the clamping assembly includes a first clamping piece and a second clamping piece, the first clamping piece and the second clamping piece are respectively provided with a through hole through which the heating piece can pass, and the inner contour shape and size of the through hole are consistent with the outer contour shape and size of the clamped part of the heating piece.

[0010] Preferably, the fixing support includes a first support and a second support, one side of the first support is set on the top inner side wall of the side of the pressure maintaining bowl away from the open structure, one end of the first support is connected with the first end of the second support, and the second end of the second support is connected with the clamping assembly, wherein the first support and the second support are set at a preset angle.

[0011] Preferably, the preset angle is 60°-90°.

[0012] Preferably, the number of the fixing portion is greater than or equal to 3, and any two adjacent fixing portions are set at equal distance intervals on the top inner side wall of the side of the pressure maintaining bowl away from the open structure along the arrangement direction of the heating piece.

[0013] Preferably, the pressurizing holes are uniformly arranged on the inner side wall of the pressure maintaining bowl.

[0014] Preferably, a first temperature sensor for controlling the temperature in the pressure bowl is further arranged in the pressure bowl, one end of the first temperature sensor is connected with an inner side wall of the pressure bowl, and the other end extends towards the center of the pressure bowl.

[0015] Preferably, the outer side wall of the pressure bowl is provided with a cooling device for assisting heat dissipation of the pressure bowl, the cooling device comprises a heat dissipation copper bar arranged around the outer side wall of the pressure bowl, an airflow pipe is arranged in the heat dissipation copper bar, and an air inlet and outlet hole is arranged on the outer side wall of the heat dissipation copper bar, wherein the airflow pipe is in communication with the air inlet and outlet hole.

[0016] Preferably, a second temperature sensor is further arranged on the outer side wall of the pressure bowl, and the second temperature sensor is used for detecting the temperature of the heat pressing film heating and pressure maintaining device.

[0017] Compared with the prior art, the heat pressing film heating and pressure maintaining device has at least one of the following beneficial effects:

[0018] (1) The heat pressing film heating and pressure maintaining device provided by the utility model, by arranging the heating element in the pressure bowl, the heating element is not directly exposed to the external environment, on the one hand, the influence of the external environment on the temperature of the diaphragm is reduced, which is beneficial to heat preservation, on the other hand, the heating element is arranged above the diaphragm, so that the dental arch model placed below the diaphragm does not need to be avoided during heat pressing of the diaphragm, one process is saved, and the overall efficiency of the heat pressing process is improved, and the instant the heating element is removed, the diaphragm is prevented from being caused to be insufficiently attached to the dental arch model due to sudden temperature drop during heat pressing of the diaphragm, so that the heat pressing effect is not good, the thickness of the invisible aligner is not uniform, and finally the manufacturing precision and quality of the invisible aligner are affected.

[0019] (2) The cooling device is arranged on the outer side wall of the pressure bowl, heat dissipation and cooling of the pressure bowl are assisted, the cavity of the pressure bowl is prevented from being caused to be adhered to the diaphragm on one side of the opening structure after pressing of the diaphragm due to too high temperature of the cavity, so that the service life of the heat pressing film heating and pressure maintaining device is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are exemplarily illustrated by pictures in the drawings corresponding to the embodiments, the exemplarily illustrations do not constitute limitation on the embodiments, elements with the same reference numerals represent similar elements, unless particularly stated, the drawings do not constitute proportional limitation.

[0021] Figure 1 It is a schematic diagram of a three-dimensional structure of the heat pressing film heating and pressure maintaining device in the utility model embodiment.

[0022] Figure 2It is a longitudinal sectional view of the heat pressing film heating and pressure maintaining device in the embodiment of the utility model;

[0023] Figure 3 It is a structure schematic view of the fixed part in the embodiment of the utility model;

[0024] Figure 4 It is a structure schematic view of the heat pressing film heating and pressure maintaining device in the embodiment of the utility model under the bottom surface visual angle. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the various embodiments of the utility model, many technical details are proposed in order to make the readers better understand the utility model. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the utility model can be implemented. The division of the various embodiments below is for the convenience of description, and should not constitute any limitation on the specific implementation of the utility model.

[0026] The directional terms such as "up", "down", "left", "right" and the like used in the description herein are the directions in the drawings, and do not refer to special limitations.

[0027] As can be known from the background, in the prior art based on the heat pressing film process, the heating part for heating is exposed to the environment, and when the film is heated to the predetermined temperature and time, the heating part located below the film needs to be removed, and at the same time, the bearing disc loaded with the dental arch model is moved to below the film, and then the pressure maintaining device is used to blow and maintain pressure. Since the heating part is exposed to the external environment, and the heating part also needs to be removed during heat pressing, in order to ensure the temperature of the heated film, the heating temperature needs to be increased or the heating time needs to be prolonged to meet the heating temperature of the film, and at the same time, the film temperature drops sharply when the heating part is removed. As a result, the uncut shell formed after heat pressing is prone to have uneven thickness, the mechanical properties are reduced, and the shell is prone to tear.

[0028] Based on this, the applicant proposes a hot pressing film heating and pressure maintaining device for the hot pressing film production process of an invisible orthodontic device, which comprises a pressure maintaining bowl, a heating element and a pressure hole arranged inside the pressure maintaining bowl, wherein the pressure maintaining bowl is used to press the film after heating is completed, and the side of the pressure maintaining bowl facing the film to be pressed is of an open structure; the heating element is used to heat the film to soften the film, and the heating element is arranged inside the pressure maintaining bowl away from the open structure; the pressure hole is arranged in communication with a pressure device to press the softened film to make the film be pressed and covered on a dental model to be shaped, and the pressure hole is arranged on the inner side wall of the pressure maintaining bowl and below the heating element. Through such a structure design, on the one hand, the heating element is arranged inside the pressure maintaining bowl and is not directly exposed to the external environment, thereby reducing the influence of the external environment on the temperature of the film and being beneficial to heat preservation; on the other hand, the heating element is arranged above the film, so that the dental model placed below the film does not need to be avoided when the film is hot pressed, thereby saving a process and being beneficial to the overall efficiency improvement of the hot pressing film process.

[0029] The specific description will be made below in combination with the drawings.

[0030] Please refer to Figure 1As shown. The application provides a hot pressing film heating and pressure maintaining device 100 for the production process of the hot pressing film of the invisible orthodontic appliance, which comprises a pressure maintaining bowl 10, a heating element 11 and a pressurizing hole 12 arranged inside the pressure maintaining bowl, wherein the pressure maintaining bowl 10 is used for pressing the film after heating, and the side of the pressure maintaining bowl 10 facing the film to be pressed is an open structure 13; the heating element 11 is used for heating the film to soften the film, and the heating element 11 is arranged on the side of the pressure maintaining bowl 10 far away from the open structure 13; the pressurizing hole 12 is arranged in communication with a pressurizing device, which is used for pressing the softened film to make the film be pressed and formed on the dental model, and specifically, the pressurizing device can be a pressurizing air valve, which provides positive pressure to the pressure maintaining bowl 10 to press the film to be pressed on the dental model. Wherein the pressurizing hole 12 is arranged on the inner side wall of the pressure maintaining bowl 10 and below the heating element 11. Further, the arrangement position of the pressurizing hole 12 must be higher than the film to be pressed and the dental model, so as to avoid the pressurizing hole 12 blowing air to the film to be pressed and the dental model, so that the temperature of the side of the film to be pressed and the dental model blown by the air drops rapidly and is obviously lower than the temperature of other sides, which will cause the uneven heating of each side of the film to be pressed and the dental model, thereby causing the problem of insufficient fit of the film to be pressed and the dental model, and finally affecting the quality of the invisible orthodontic appliance; in the application, the space of the heating element 11 to the top side wall of the pressure maintaining bowl 10 far away from the open structure 13 is small, which is not conducive to arranging the pressurizing hole 12, and the pressurizing hole 12 is arranged below the heating element 11, so as to avoid the heating element 11. Wherein the heating element 11 can adopt heating coil and the like to realize, and the application does not make limitation.

[0031] Specifically, in the hot pressing film production process of the invisible aligner, first, the heating element 11 is opened and preheated to a preset temperature, then according to the case, the film device is controlled by the control system to match the film required by the case, and is transmitted to the bottom of the hot pressing film heating and pressure maintaining device 100 through the transmission device, the hot pressing film heating and pressure maintaining device 100 presses the film, the film is located below the heating element 11, at this time, the heating element 11 is controlled by the control system to heat the film, after the film is softened, or the real-time temperature reaches the preset temperature through real-time detection, the heating element 11 is turned off; at the same time, the control system controls the dental model transmission device to transmit the dental model to the dental model carrying table of the station, and the dental model carrying table carrying the dental model is lifted to the film directly below through the lifting device on the station; then the pressure hole 12 continuously blows air into the cavity chamber of the pressure maintaining bowl 10 until the preset pressure is reached and the pressure is maintained for a certain time, at this time, the cavity chamber of the pressure maintaining bowl 10 is in a sealed state; finally, after the pressure maintaining is completed, the film is hot pressed on the dental model to form an uncut invisible aligner, which is cut and polished to form the invisible aligner.

[0032] In this process, the film is always located below the heating element 11, so that when the hot pressing film is prepared, i.e. the dental model is moved to the film below, the heating element 11 does not need to be removed, and the dental model is moved to the film below. With this design, on the one hand, it avoids the situation that when the heating element 11 is removed, the film will cause the temperature to drop suddenly, which will lead to the fact that the film and the dental model are not well fitted when hot pressing the film, the hot pressing film effect is not good, the thickness of the invisible aligner formed is not uniform, and finally the production precision and quality of the invisible aligner are affected. On the other hand, the heating element 11 in the application is arranged in the cavity chamber of the pressure maintaining bowl 10, the heating temperature is less affected by the external environment, which is conducive to controlling the temperature in the pressure maintaining bowl 10 and stabilizing the temperature control of the film. Moreover, the hot pressing film heating and pressure maintaining device 100 provided by the application is designed ingeniously, has compact structure, small volume, low cost and flexible use.

[0033] Further explanation, in order to improve the sealing effect of the cavity chamber of the pressure maintaining bowl 10 and ensure the pressure maintaining effect, the application can also be provided with a sealing ring 50 on the side of the side wall of the opening structure 13 facing the film to be pressed, which can form effective sealing between the film and the side wall of the opening structure 13.

[0034] Further explanation, please refer to Figure 2When the film 200 is pressed and shaped on the dental model 300, the heating element 11 is arranged at a preset distance L from the film 200, wherein the preset distance L is 20-50 mm. Specifically, after heating, the surface temperature of the heating element 11 is still high, for example, 200-300℃. If the heating element 11 and the film 200 are in contact, the film will melt at high temperature, which will cause damage to the film, for example, uneven thickness, even partial film damage, etc., affecting the quality of the final shaped invisible aligner. Moreover, if the film 200 and the heating element 11 are in contact and melt, the heating element 11 will be contaminated or damaged. In the design of the heat-pressing film heating and pressure maintaining device 100, the heating element 11 and the film 200 are arranged at a preset distance L, without the need for additional structures such as a barrier layer, for example, arranged at 20 mm, which can achieve the purpose of the application. However, when the preset distance L is too large, for example, more than 50 mm, although it can prevent the film 200 and the heating element 11 from being in contact and melting, the large distance will increase the temperature or time required to soften the film 200, which is not conducive to energy saving.

[0035] Further description of the fixing of the heating element 11, in this embodiment, the heating element 11 is a circular heating coil, of course, it can be understood that the heating coil can also be arranged in a square shape, and the arrangement form is not limited by the figure. Please continue to refer to Figure 1 and refer to Figure 3As shown, a plurality of fixing portions 14 for fixing the heating element 11 are arranged on the top inner side wall of the pressure maintaining bowl 10 away from the opening structure 13, the fixing portion 14 comprises a clamping assembly 15 for clamping the heating element 11 and a fixing support 16 for mounting the clamping assembly 15, the clamping assembly 15 comprises a first clamping piece 151 and a second clamping piece 152, the first clamping piece 151 and the second clamping piece 152 are respectively provided with a through hole through which the heating element 11 can pass, the inner contour shape and size of the through hole are consistent with the outer contour shape and size of the part of the heating element 11 to be clamped. Specifically, the circular heating coil is a non-closed circular structure, when the circular heating coil is installed, one end of the circular heating coil is sequentially clamped through the first clamping piece 151 and the second clamping piece 152 of the fixing portion 14, and then the fixing portion 14 is mounted on the top inner side wall of the pressure maintaining bowl 10 away from the opening structure 13. If the fixing portion 14 is a plurality of fixing portions, the heating coil is sequentially clamped through the first clamping piece 151 and the second clamping piece 152 of the plurality of fixing portions 14. The clamping assembly 15 provided with two clamping pieces (the first clamping piece 151 and the second clamping piece 152) can enable at least a certain length of the heating coil to be erected between the first clamping piece 151 and the second clamping piece 152, compared with one clamping piece, the heating coil can be more balanced and stable. It should be noted that if the fixing portion 14 is a plurality of fixing portions, please refer to Figure 4 As shown, in this embodiment, three fixing portions 14 are taken as an example for illustration, the heating coil is circular as a whole, and the three fixing portions 14 can be arranged at intervals along the circumference of the circle. In a preferred embodiment, any two adjacent fixing portions 14 are arranged at equal intervals, so that the support of each part of the heating coil is more uniform, and the installation is more stable, and the inclination does not occur, so that the uniformity of each area of the diaphragm during heating can be ensured.

[0036] Further explanation: The fixing bracket 16 includes a first bracket 161 and a second bracket 162. One side of the first bracket 161 is disposed on the top inner wall of the pressure bowl 10 away from the opening structure 13. This allows for a larger contact area and more stable installation when one side of the first bracket 161 is in contact with the top inner wall of the pressure bowl 10 away from the opening structure 13. Continuing the explanation, one end of the first bracket 161 is connected to the first end of the second bracket 162, and the second end of the second bracket 162 is connected to the clamping assembly 15. The fixing bracket 16 is generally arranged in a "7" shape, with the first bracket 161 and the second bracket 162 set at a preset angle α. In some preferred embodiments, the preset angle α is 60°-90°. This design ensures that when the fixing part 14 with the heating coil installed is installed onto the top inner wall of the pressure bowl 10 away from the opening structure 13, the heating coil can maintain a certain distance from the inner wall of the fixing part, facilitating the operator's installation of the fixing part 14. When the first bracket 161 and the second bracket 162 are set at 90°, the length of the second bracket 162 is relatively small, that is, the length of the second bracket 162 is consistent with the shortest vertical distance required by the operator to install the fixing part 14. Of course, it is understandable that when the first bracket 161 and the second bracket 162 are set at other angles, such as 60°, it is also a more ideal implementation form. That is, it can balance between ensuring the effective operating distance of the operator and the length of the second bracket 162, without consuming too much material to make an excessively long second bracket 162, so as to meet the operating distance of the operator.

[0037] For further explanation, please refer to [link / reference]. Figure 1 and Figure 2 As shown, the pressure holes 12 are evenly arranged circumferentially on the inner sidewall of the pressure cup 10. In a preferred embodiment, the circumferential spacing between two adjacent pressure holes 12 is equal. This arrangement ensures that air can be evenly blown onto all sides of the diaphragm and the dental model, resulting in a more uniform temperature across the surfaces. This improves the fit of the diaphragm when pressed onto the dental model, thereby guaranteeing the quality of the final invisible aligner.

[0038] For further explanation, please refer to [link / reference]. Figure 1As shown, the heat pressing film heating and pressure maintaining device 100 of the present application further comprises a first temperature sensor 20 arranged in the pressure maintaining bowl 10 for controlling the temperature in the pressure maintaining bowl 10. One end of the first temperature sensor 20 is connected to an inner side wall of the pressure maintaining bowl 10, and the other end extends towards the center of the pressure maintaining bowl 10 for real-time detection of the air flow temperature in the cavity of the pressure maintaining bowl 10, so as to facilitate accurate temperature control. For example, during the presetting process of the heating element 11, when the first temperature sensor 20 detects that the temperature has reached the preset temperature, the heating can be paused. When the film reaches the target position, the heating element 11 starts heating, and the first temperature sensor 20 detects the real-time temperature until the target temperature value is reached.

[0039] Further description, please continue to read Figure 1 As shown, in order to reduce the heat transfer of the heating element 11 to the outside of the pressure maintaining bowl 10, the heat pressing film heating and pressure maintaining device 100 of the present application can further coat a heat insulation coating on the inner side wall of the pressure maintaining bowl 10, or can further arrange a heat insulation plate between the inner side wall of the pressure maintaining bowl 10 and the heating element 11. In this way, the heat preservation performance of the heat pressing film heating and pressure maintaining device 100 can be better, and it is not affected by the external environment temperature. In a preferred embodiment, the heat pressing film heating and pressure maintaining device 100 can coat a heat insulation coating on the inner side wall of the pressure maintaining bowl 10, and further arrange a heat insulation plate between the inner side wall of the pressure maintaining bowl 10 and the heating element 11, so as to achieve better heat transfer reduction effect.

[0040] Further description, please continue to read Figure 1 As shown, in order to avoid the situation that the cavity of the pressure maintaining bowl 10 is overheated due to the long-time work of the heat pressing film heating and pressure maintaining device 100 of the present application, and the film is adhered to one side of the opening structure 13 near the film after pressing, the cooling device 30 for assisting the heat dissipation of the pressure maintaining bowl 10 is arranged on the outer side wall of the pressure maintaining bowl. The cooling device 30 comprises a heat dissipation copper bar 31 arranged around the outer side wall of the pressure maintaining bowl 10. The heat dissipation copper bar 31 is internally provided with an air flow pipeline, and the outer side wall of the heat dissipation copper bar 31 is provided with an air inlet and outlet hole 32, wherein the air flow pipeline is in communication with the air inlet and outlet hole 32. Specifically, after the pressure maintaining is completed and the invisible aligner is formed, the heat pressing film heating and pressure maintaining device 100 is lifted, the circulating air flow of the air inlet and outlet hole 32 is turned on, and the heat of the heat dissipation copper bar 31 is taken away, thereby assisting the cooling of the pressure maintaining bowl 10.

[0041] Further description, please continue to read Figure 1The second temperature sensor 40 is arranged on the outer wall of the pressure maintaining bowl 10, and is used to detect the temperature of the hot-pressing film heating pressure maintaining device 100, so as to facilitate heat dissipation control. For example, when the second temperature sensor 40 detects that the temperature of the hot-pressing film heating pressure maintaining device 100 reaches a preset low temperature, the circulating air flow of the air inlet and outlet hole 32 can be closed, and the temperature does not need to be continuously lowered. When the second temperature sensor 40 detects that the temperature of the hot-pressing film heating pressure maintaining device 100 is higher than the preset low temperature, the circulating air flow of the air inlet and outlet hole 32 can be manually or automatically opened by using a control system, so as to continue to dissipate heat and lower the temperature.

[0042] It should be noted that the above embodiments can be freely combined to form different new embodiments according to the needs without causing contradictions, and the embodiments formed after the combination are within the protection scope of the present application. In order to save the length of the application text, the details are not described here.

[0043] The above is only the preferred embodiment of the present application. It should be noted that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

[0044] Similarly, the above is only the specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, and all of them should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A heat press film heating and pressure maintaining device for a heat press film production process of an invisible aligner, characterized by, The heating bowl is provided with a heating element and a pressurizing hole inside the heating bowl, The heating bowl is used to pressurize the film after heating, and the side of the heating bowl facing the film to be pressed is an open structure; The heating element is used to heat the film to soften the film, and the heating element is arranged inside the heating bowl away from the open structure; The pressurizing hole is in communication with a pressurizing device and is used to pressurize the softened film to make the film be pressed and formed on the dental model, and the pressurizing hole is arranged on the inner side wall of the heating bowl below the heating element.

2. The hot stamp film heating and pressure maintaining device of claim 1, wherein, When the film is pressed and formed on the dental model, the side of the heating element facing the film is arranged at a preset distance from the film, wherein the preset distance is 20-50 mm.

3. The hot bar heating and hold-down apparatus of claim 1 or 2, wherein A plurality of fixing parts for fixing the heating element are arranged on the top inner side wall of the heating bowl away from the open structure, the fixing part comprises a clamping assembly for clamping the heating element and a fixing support for mounting the clamping assembly, the clamping assembly comprises a first clamping part and a second clamping part, and the first clamping part and the second clamping part are respectively provided with a through hole through which the heating element passes, and the inner contour of the through hole is consistent in shape and size with the outer contour of the part to be clamped of the heating element.

4. The hot stamp film heating and pressure maintaining device of claim 3, wherein, The fixing support comprises a first support and a second support, one side of the first support is arranged on the top inner side wall of the heating bowl away from the open structure, one end of the first support is connected with the first end of the second support, and the second end of the second support is connected with the clamping assembly, wherein the first support and the second support are arranged at a preset angle.

5. The hot stamp film heating and pressure maintaining device of claim 4, wherein, The preset angle is 60-90°.

6. The hot stamp film heating and pressure maintaining device of claim 3, wherein, The number of the fixing parts is greater than or equal to 3, and any two adjacent fixing parts are arranged at equal distances along the arrangement direction of the heating element on the top inner side wall of the heating bowl away from the open structure.

7. The hot stamp film heating and pressure maintaining device of claim 1, wherein, The pressurizing holes are uniformly arranged on the inner side wall of the heating bowl.

8. The hot stamp film heating and pressure maintaining device of claim 1, wherein, A first temperature sensor for controlling the temperature in the heating bowl is arranged in the heating bowl, one end of the first temperature sensor is connected with an inner side wall of the heating bowl, and the other end extends towards the center of the heating bowl.

9. The hot stamp film heating and pressure maintaining device of claim 1, wherein, The outer side wall of the heating bowl is provided with a cooling device for assisting heat dissipation of the heating bowl, the cooling device comprises a copper heat sink arranged on the outer side wall of the heating bowl, an airflow pipeline is arranged in the copper heat sink, and an air inlet and outlet hole is arranged on the outer side wall of the copper heat sink, wherein the airflow pipeline is in communication with the air inlet and outlet hole.

10. The hot stamp film heating and pressure maintaining device of claim 9, wherein, A second temperature sensor is arranged on the outer side wall of the heating bowl, and the second temperature sensor is used to detect the temperature of the heat pressing film heating and pressurizing device.

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