3D printer hot bed and 3D printer

Abstract

The utility model discloses a 3D printer hot bed and a 3D printer. The 3D printer hot bed comprises a forming platform and a sensor assembly. Wherein the sensor assembly is connected to the forming platform, the sensor assembly comprises a rigid top plate, a flexible bottom plate connected to the rigid top plate and a sensing element arranged on the flexible bottom plate, and the flexible bottom plate is configured to receive the acting force of the rigid top plate and transmit the acting force to the sensing element; the rigid top plate is connected to the forming platform. The sensor assembly in the hot bed of the 3D printer is of a double-layer structure made of different materials, the triggering sensitivity of the sensor assembly is improved, the deviation between the surface of the hot bed and the moving plane of the printing nozzle can be sensitively sensed, and accurate leveling of the hot bed is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, in particular to a 3D printer hot bed and a 3D printer. BACKGROUND

[0002] In the 3D printing technology, the deviation of the balance degree between the hot bed and the movement path plane of the printing nozzle will seriously affect the accuracy of 3D printing. How to sensitively detect the deviation between the hot bed and the movement path plane of the printing nozzle of the 3D printer has become an important factor for effectively solving the balance problem between the hot bed surface and the movement path plane of the printing nozzle of the 3D printer and realizing the accurate leveling of the hot bed of the 3D printer. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present application is to solve the above problems, and provide a 3D printer hot bed and a 3D printer, the 3D printer hot bed comprising a sensor assembly, which can sensitively sense the deviation between the hot bed surface and the movement plane of the printing nozzle, and ensure the accurate leveling of the 3D printer hot bed.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] In a first aspect, a 3D printer hot bed is provided, comprising a forming platform and a sensor assembly; the sensor assembly is connected to the forming platform, and the sensor assembly comprises a rigid top plate, a flexible bottom plate connected to the rigid top plate, and a sensing element provided on the flexible bottom plate; the flexible bottom plate is configured to receive the acting force of the rigid top plate and transmit it to the sensing element; and the rigid top plate is connected to the forming platform.

[0006] Preferably, the flexible bottom plate comprises a frame and a spring piece provided in the area surrounded by the frame, and the spring piece is connected to the first side edge of the frame.

[0007] Preferably, the spring piece comprises a first elastic arm and a second elastic arm connected to the first end of the first elastic arm, the second end of the first elastic arm is connected to the first side edge, and the second elastic arm is provided in the area surrounded by the first elastic arm and the frame; and the sensing element is provided on the connection area of the first elastic arm and the first side edge.

[0008] Preferably, the sensing element is packaged on the spring piece by insulating glue.

[0009] Preferably, the cross-sectional thickness of the connection area of the first elastic arm and the first side edge is 1-2mm; and the cross-sectional width of the connection area of the first elastic arm and the first side edge is 4-10mm.

[0010] Preferably, the rigid top plate comprises a main body part, and bending parts and adapter parts symmetrically arranged on both sides of the main body part, the adapter parts are connected to the bending parts, the adapter parts are riveted to the second ends of the second elastic arms through first connecting pieces, and the main body part is connected to the forming platform through a second connecting piece; the main body part is provided with a third mounting hole for mounting the second connecting piece, and the third mounting hole is projected on the first elastic arm.

[0011] Preferably, the sensor assembly is arranged corresponding to a corner area of the forming platform, the rigid top plate is connected to the forming platform through the second connecting piece, and the flexible bottom plate is arranged on a side of the rigid top plate away from the forming platform.

[0012] Preferably, the sensing element is packaged on a surface of the flexible bottom plate away from the rigid top plate.

[0013] Preferably, the flexible bottom plate is made of 65Mn spring steel, and the rigid top plate is made of A3 carbon structural steel.

[0014] In a second aspect, the present application provides a 3D printer, comprising the above-mentioned 3D printer hot bed and a nozzle module; the nozzle module comprises a 3D printing nozzle.

[0015] The present application has at least the following beneficial effects:

[0016] The present application discloses a 3D printer hot bed and a 3D printer, the 3D printer hot bed comprises a sensor assembly, the sensor assembly is arranged in a double-layer structure and comprises a rigid top plate and a flexible bottom plate fixedly connected to each other; the triggering sensitivity of the sensor assembly is improved, the deviation between the surface of the hot bed and the moving plane of the printing nozzle can be sensitively sensed, and the accurate leveling of the 3D printer hot bed is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a 3D printer hot bed of the present application;

[0018] Figure 2 FIG. 2 is an exploded view of the 3D printer hot bed shown in FIG. 1; Figure 1

[0019] Figure 3 FIG. 5 is a structural schematic diagram of a sensor assembly;

[0020] Figure 4 FIG. 6 is a structural schematic diagram of a flexible bottom plate;

[0021] Figure 5 FIG. 7 is a structural schematic diagram of a rigid top plate;

[0022] Figure 6 ​A schematic diagram of the distribution of the sensor assembly;

[0023] Figure 7 A schematic diagram of the transmission path of the force in the sensor assembly;

[0024] Figure 8 A stress displacement analysis test map of different cross-sectional widths when the cross-sectional thickness is 1mm.

[0025] Wherein, 2 is a forming platform, 3 is a sensor assembly, 31 is a rigid top plate, 311 is a main body, 312 is a bending part, 313 is an adapter, 314 is a third mounting hole, 32 is a flexible bottom plate, 321 is a frame, 3211 is a first side, 322 is a spring, 3221 is a first spring arm, 3222 is a second spring arm, 33 is a sensing element, 34 is a first connecting piece, 35 is a second connecting piece. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element.

[0028] In the present application, the description such as "first", "second", etc. is only for the purpose of description and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features.

[0029] Embodiment:

[0030] As shown in Figures 1 to 3 , it comprises a forming platform 2 and a sensor assembly 3; the sensor assembly 3 is connected to the forming platform 2, the sensor assembly 3 comprises a rigid top plate 31, a flexible bottom plate 32 connected to the rigid top plate 31 and a sensing element 33 provided on the flexible bottom plate 32, the flexible bottom plate 32 is configured to receive the force of the rigid top plate 31 and transmit to the sensing element 33, the rigid top plate 31 is connected to the forming platform 2.

[0031] The 3D printer hot bed described in the application comprises a sensor assembly 3 arranged in a double-layer structure, which comprises a rigid top plate 31 and a flexible bottom plate 32 fixedly connected with each other. On the one hand, the double-layer structure is arranged, and when force is applied, the force is transmitted to the flexible bottom plate 32 through the rigid top plate 31 after the rigid top plate 31 is stressed, the flexible bottom plate 32 is deformed and amplifies the force, and under the condition that the sensitive value of the sensing element 33 is constant, a relatively smaller trigger force can trigger the sensing element 33, thereby improving the reaction sensitivity of the sensor assembly 3, and the small deviation of the hot plate assembly can be detected, the accuracy of leveling is realized, and the model printing precision is ensured. On the other hand, the rigid top plate 31 does not deform when stressed, and the force received during use is transmitted to the flexible bottom plate 32 in real time and without loss, the flexible bottom plate 32 provides sufficient supporting force while being deformed under stress to transmit the force to the sensing element 33, and the combined structure of the rigid top plate 31 and the flexible bottom plate 32 ensures the transmission of the force and has durability. Preferably, the sensing element 33 is a piezoelectric ceramic sensing element 33.

[0032] Referring to Figure 4 As shown, the flexible bottom plate 32 comprises a frame 321 and a spring sheet 322 arranged in the area surrounded by the frame 321, and the spring sheet 322 is connected to the first side edge 3211 of the frame 321.

[0033] The spring sheet 322 comprises a first spring arm 3221 and a second spring arm 3222 connected to the first end of the first spring arm 3221, the second end of the first spring arm 3221 is connected to the first side edge 3211, and the second spring arm 3222 is arranged in the area surrounded by the first spring arm 3221 and the frame 321; the sensing element 33 is arranged on the connection area of the first spring arm 3221 and the first side edge 3211, and the sensing element 33 is packaged on the spring sheet 322 by insulating glue. That is, the spring sheet 322 is arranged in the area surrounded by the frame 321, and the spring sheet 322 is connected to the first side edge 3211 of the frame 321 through the second end of the first spring arm 3221. It should be noted that the first end refers to the end close to the first side edge 3211, and the second end refers to the end away from the first side edge 3211. As a preferred embodiment, the spring sheet 322 in the application comprises two second spring arms 3222, which are symmetrically arranged on both sides of the first spring arm 3221, and the second end of the first spring arm 3221 is connected to the middle area of the first side edge 3211. The overall structure of the spring sheet 322 is similar to a mountain shape.

[0034] The cross-sectional thickness of the first elastic arm 3221 and the connecting area of the first side edge 3211 is 1-2 mm, preferably 1 mm. It can be understood that the overall thickness of the elastic sheet 322 is uniform and equal to the cross-sectional thickness of the first elastic arm 3221 and the connecting area of the first side edge 3211, or the overall thickness of the elastic sheet 322 is not uniform. The cross-sectional width of the first elastic arm 3221 and the connecting area of the first side edge 3211 is 4-10 mm, preferably 6 mm.

[0035] Referring to Figures 2 to 5 As shown, the rigid top plate 31 includes a main body part 311 and a bending part 312 and an adapter part 313 symmetrically arranged on both sides of the main body part 311. The adapter part 313 is connected to the bending part 312. The bending part 312 is arranged in parallel with the main body part 311. The adapter part 313 is riveted to the second end of the second elastic arm 3222 through a first connecting piece 34. Further, the adapter part 313 is respectively provided with a first mounting hole. The second end of the second elastic arm 3222 is respectively provided with a second mounting hole corresponding to the first mounting hole. The first connecting piece penetrates the first mounting hole and the second mounting hole. The riveting process is used to fix the adapter part 313 and the second elastic arm 3222 to each other, thereby fixing and connecting the rigid top plate 31 and the flexible bottom plate 32 to each other. The main body part 311 is connected to the forming platform 2 through a second connecting piece 35. The main body part 311 is provided with a third mounting hole 314 for mounting the second connecting piece 35. The third mounting hole 314 is projected on the first elastic arm 3221. The adapter part 313 is riveted to the second end of the second elastic arm 3222 through the first connecting piece 34, that is, the rigid top plate 31 is riveted to the flexible bottom plate 32 through the first connecting piece 34. In some embodiments, the first connecting piece 34 is preferably an aluminum rivet which is easy to process.

[0036] Referring to Figure 6 As shown, the sensor assembly 3 is arranged corresponding to the corner area of the forming platform 2. The rigid top plate 31 is connected to the forming platform 2 through the second connecting piece 35. The flexible bottom plate 32 is arranged on the side of the rigid top plate 31 away from the forming platform 2.

[0037] The sensing element 33 is packaged on the surface of the flexible bottom plate 32 away from the rigid top plate 31. The structure of the sensor assembly 3 is that the space formed between the rigid top plate 31 and the flexible bottom plate 32 after assembly is small, which is not convenient for installing the sensing element 33 and is easy to cause damage to the sensing element 33. Therefore, based on the arrangement and installation process of the rigid top plate 31 and the flexible bottom plate 23, the sensing element 33 is packaged on the surface of the flexible bottom plate 32 away from the rigid top plate 31, which facilitates the overall installation of the sensor assembly 3 and avoids damage to the sensing element 33.

[0038] Further, in order to ensure the flatness of the surface of the forming platform 2, the second connecting piece 35 is preferably an internal hexagonal countersunk screw, and the area corresponding to the second connecting piece 35 on the forming platform 2 is provided with a counterbore for installing the second connecting piece 35.

[0039] Optionally, the flexible bottom plate 32 is made of 65Mn spring steel, the selection of the material of the flexible bottom plate 32 provides sufficient support, can quickly recover after deformation under the action of force, and ensures the durability of the flexible bottom plate 32; the rigid top plate 31 is made of A3 carbon structural steel, the selection of the material of the rigid top plate 31 ensures the rigidity requirement, facilitates bending, and avoids appearance spraying. Specifically, the performance parameters of the 65Mn spring steel are as follows: standard: GB / T1222-2007, tensile strength Rb(MPa): 735, yield strength Rs(MPa): 430, elongation δ10(%): 14-21.5, reduction of area ψ(%): not less than 10; the performance parameters of the A3 carbon structural steel are as follows: standard: GB / T699-1999 (high-quality carbon structural steel), elastic modulus (E / Gpa): 200-210, Poisson's ratio (v): 0.25-0.33, tensile strength σ(b / MPa): 375-500, elongation (δ5 / %): ≥26(a≤16mm).

[0040] When the 3D printer hot bed plane is offset relative to the printing nozzle moving path plane during use, the printing nozzle abuts against the 3D printer hot bed, an acting force is generated on the 3D printer hot bed, the acting force is transmitted to the rigid top plate 31 through the second connecting piece 35, the rigid top plate 31 generates an acting force on the second elastic arm 3222 of the flexible bottom plate 32 after being stressed, the second elastic arm 3222 is deformed to drive the first elastic arm 3221 to deform, the first elastic arm 3221 receives the deformation force and transmits it to the area corresponding to the sensing element 33, a triggering force is formed in the connection area between the first elastic arm 3221 and the first side edge 3211, and the sensing element 33 is triggered to generate an induction signal. Figure 7As shown, the transmission path of the force is transmitted from the third mounting hole 314 on the rigid top plate 31 to the second end of the second elastic arm 3222, then from the second end of the second elastic arm 3222 to the first end of the second elastic arm 3222, and then from the first end of the first elastic arm 3221 to the connection between the first elastic arm 3221 and the first side edge 3211, which further indicates that the facility in the present application adopts a double-layer structure, increases the lever length of the force arm on a limited area, amplifies the force, and in the case of a certain deformation sensitivity value of the sensing element 33, a smaller trigger force can trigger it. Under the condition that the cross-sectional thickness of the connection area between the first elastic arm 3221 and the first side edge 3211 is 1 mm, the stress displacement of different cross-sectional widths is analyzed, and the stress is 185g, that is, 1.813N / kg. Among them, the stress cross-sectional area is denoted as S, the cross-sectional thickness is denoted as H, the cross-sectional width is denoted as L, the load is denoted as P, and the displacement is denoted as λ; as shown in the figure, Figure 8 When the cross-sectional thickness H is 1 mm and the cross-sectional length L is 6 mm, that is, the stress cross-sectional area S is HL=6mm2, a stress limit value of 3.743E+07N / m^2 can obtain a displacement limit value of 4.362E-02mm, and a smaller 1.813N / kg down pressure can obtain a larger and appropriate displacement, that is, the deformation of the sheet metal meets the deformation threshold of the piezoelectric ceramic.

[0041] The embodiment of the present application also relates to a 3D printer, which comprises the above-mentioned 3D printer hot bed and a nozzle module; the nozzle module comprises a 3D printing nozzle. The 3D printer further comprises an X-axis module, a Y-axis module and a Z-axis module; the nozzle module is connected to the X-axis module, the X-axis module is connected to the Z-axis module, the X-axis module and the Z-axis module cooperatively drive the nozzle module to move a printing consumable, the 3D printer hot bed is connected to the Y-axis module, the Y-axis module is configured to drive the 3D printer hot bed to move along the Y-axis direction, and the nozzle module cooperates with the 3D printing nozzle to print a model. Optionally, in some embodiments, the forming platform 2 comprises a build plate; in other embodiments, the forming platform 2 comprises a build plate and a hot bed. The consumable output by the 3D printing nozzle is formed on the build plate.

[0042] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0043] The above embodiments only express the preferred embodiments of the present application, which are described in a more specific and detailed manner, but should not be construed as limiting the scope of the patent application. It should be noted that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application should be subject to the appended claims.

Claims

1. A 3D printer hot bed, characterized in that, The 3D printer hot bed comprises a forming platform and a sensor assembly. The sensor assembly is connected to the forming platform, and comprises a rigid top plate, a flexible bottom plate connected to the rigid top plate, and a sensing element arranged on the flexible bottom plate.

2. The 3D printer hot bed of claim 1, wherein: The flexible bottom plate comprises a frame and a spring piece arranged in an area enclosed by the frame.

3. The 3D printer hot bed of claim 2, wherein: The spring piece comprises a first spring arm and a second spring arm connected to a first end of the first spring arm.

4. The 3D printer hot bed of claim 3, wherein: The second end of the first spring arm is connected to a first side of the frame, and the second spring arm is arranged in an area enclosed by the first spring arm and the frame.

5. The 3D printer hot bed of claim 3, wherein: The sensing element is arranged on a connection area between the first spring arm and the first side of the frame.

6. The 3D printer hot bed of claim 3, wherein: The sensing element is encapsulated on the spring piece by an insulating glue.

7. The 3D printer hot bed of claim 6, wherein: The cross-sectional thickness of the connection area between the first spring arm and the first side of the frame is 1-2 mm.

8. The 3D printer hot bed of claim 6, wherein: The cross-sectional width of the connection area between the first spring arm and the first side of the frame is 4-10 mm.

9. The 3D printer hot bed of claim 1, wherein: The rigid top plate comprises a main body, a bending part and an adapter part symmetrically arranged on both sides of the main body.

10. A 3D printer characterized by: The adapter part is connected to the bending part, and is riveted to a second end of the second spring arm by a first connecting piece. The main body is connected to the forming platform by a second connecting piece. A third mounting hole for mounting the second connecting piece is arranged on the main body, and the third mounting hole projects on the first spring arm. The rigid top plate is connected to the forming platform by the second connecting piece. The flexible bottom plate is arranged on a side of the rigid top plate away from the forming platform. The sensing element is encapsulated on a surface of the flexible bottom plate away from the rigid top plate. The flexible bottom plate is made of 65Mn spring steel, and the rigid top plate is made of A3 carbon structural steel. The 3D printer hot bed comprises a forming platform and a sensor assembly. The sensor assembly is connected to the forming platform, and comprises a rigid top plate, a flexible bottom plate connected to the rigid top plate, and a sensing element arranged on the flexible bottom plate. The flexible bottom plate comprises a frame and a spring piece arranged in an area enclosed by the frame. The spring piece comprises a first spring arm and a second spring arm connected to a first end of the first spring arm. The second end of the first spring arm is connected to a first side of the frame, and the second spring arm is arranged in an area enclosed by the first spring arm and the frame. The sensing element is arranged on a connection area between the first spring arm and the first side of the frame. The sensing element is encapsulated on the spring piece by an insulating glue. The cross-sectional thickness of the connection area between the first spring arm and the first side of the frame is 1-2 mm. The cross-sectional width of the connection area between the first spring arm and the first side of the frame is 4-10 mm. The rigid top plate comprises a main body, a bending part and an adapter part symmetrically arranged on both sides of the main body. The adapter part is connected to the bending part, and is riveted to a second end of the second spring arm by a first connecting piece. The main body is connected to the forming platform by a second connecting piece. A third mounting hole for mounting the second connecting piece is arranged on the main body, and the third mounting hole projects on the first spring arm. The rigid top plate is connected to the forming platform by the second connecting piece. The flexible bottom plate is arranged on a side of the rigid top plate away from the forming platform. The sensing element is encapsulated on a surface of the flexible bottom plate away from the rigid top plate. The flexible bottom plate is made of 65Mn spring steel, and the rigid top plate is made of A3 carbon structural steel. The 3D printer hot bed comprises a forming platform and a sensor assembly. The sensor assembly is connected to the forming platform, and comprises a rigid top plate, a flexible bottom plate connected to the rigid top plate, and a sensing element arranged on the flexible bottom plate. The flexible bottom plate comprises a frame and a spring piece arranged in an area enclosed by the frame. The spring piece comprises a first spring arm and a second spring arm connected to a first end of the first spring arm. The second end of the first spring arm is connected to a first side of the frame, and the second spring arm is arranged in an area enclosed by the first spring arm and the frame. The sensing element is arranged on a connection area between the first spring arm and the first side of the frame. The sensing element is encapsulated on the spring piece by an insulating glue. The cross-sectional thickness of the connection area between the first spring arm and the first side of the frame is 1-2 mm. The cross-sectional width of the connection area between the first spring arm and the first side of the frame is 4-10 mm. The rigid top plate comprises a main body, a bending part and an adapter part symmetrically arranged on both sides of the main body. The adapter part is connected to the bending part, and is riveted to a second end of the second spring arm by a first connecting piece. The main body is connected to the forming platform by a second connecting piece. A third mounting hole for mounting the second connecting piece is arranged on the main body, and the third mounting hole projects on the first spring arm. The rigid top plate is connected to the forming platform by the second connecting piece. The flexible bottom plate is arranged on a side of the rigid top plate away from the forming platform. The sensing element is encapsulated on a surface of the flexible bottom plate away from the rigid top plate. The flexible bottom plate is made of 65Mn spring steel, and the rigid top plate is made of A3 carbon structural steel. The 3D printer hot bed comprises a forming platform and a sensor assembly. The sensor assembly is connected to the forming platform, and comprises a rigid top plate, a flexible bottom plate connected to the rigid top plate, and a sensing element arranged on the flexible bottom plate. The flexible bottom plate comprises a frame and a spring piece arranged in an area enclosed by the frame. The spring piece comprises a first spring arm and a second spring arm connected to a first end of the first spring arm. The second end of the first spring arm is connected to a first side of the frame, and the second spring arm is arranged in an area enclosed by the first spring arm and the frame. The sensing element is arranged on a connection area between the first spring arm and the first side of the frame. The sensing element is encapsulated on the spring piece by an insulating glue. The cross-sectional thickness of the connection area between the first spring arm and the first side of the frame is 1-2 mm. The cross-sectional width of the connection area between the first spring arm and the first side of the frame is 4-10 mm. The rigid top plate comprises a main body, a bending part and an adapter part symmetrically arranged on both sides of the main body. The adapter part is connected to the bending part, and is riveted to a second end of the second spring arm by a first connecting piece. The main body is connected to the forming platform by a second connecting piece. A third mounting hole for mounting the second connecting piece is arranged on the main body, and the third mounting hole projects on the first spring arm. The rigid top plate is connected to the forming platform by the second connecting piece. The flexible bottom plate is arranged on a side of the rigid top plate away from the forming platform. The sensing element is encapsulated on a surface of the flexible bottom plate away from the rigid top plate. The flexible bottom plate is made of 65Mn spring steel, and the rigid top plate is made of A3 carbon structural steel. The 3D printer hot bed comprises a forming platform and a sensor assembly. The sensor assembly is connected to the forming platform, and comprises a rigid top plate, a flexible bottom plate connected to the rigid top plate, and a sensing element arranged on the flexible bottom plate. The flexible bottom plate comprises a frame and a spring piece arranged in an area enclosed by the frame. The spring piece comprises a first spring arm and a second spring arm connected to a first end of the first spring arm. The second end of the first spring arm is connected to a first side of the frame, and the second spring arm is arranged in an area enclosed by the first spring arm and the frame. The sensing element is arranged on a connection area between the first spring arm and the first side of the frame. The sensing element is encapsulated on the spring piece by an insulating glue. The cross-sectional thickness of the connection area between the first spring arm and the first side of the frame is 1-2 mm. The cross-sectional width of the connection area between the first spring arm and the first side of the frame is 4-10 mm. The rigid top plate comprises a main body, a bending part and an adapter part symmetrically arranged on both sides of the main body. The adapter part is connected to the bending part, and is riveted to a second end of the second spring arm by a first connecting piece. The main body is connected to the forming platform by a second connecting piece. A third mounting hole for mounting the second connecting piece is arranged on the main body, and the third mounting hole projects on the first spring arm. The rigid top plate is connected to the forming platform by the second connecting piece. The flexible bottom plate is arranged on a side of the rigid top plate away from the forming platform. The sensing element is encapsulated on a surface of the flexible bottom plate away from the rigid top plate. The flexible bottom plate is made

Images