CN220499960U

CN220499960U - Touch sensing device and three-dimensional forming equipment

Info

Publication number: CN220499960U
Application number: CN202321985182.3U
Authority: CN
Inventors: 唐亮; 王敬杰
Original assignee: Shenzhen Anycubic Technology Co Ltd
Current assignee: Shenzhen Anycubic Technology Co Ltd
Priority date: 2023-07-26
Filing date: 2023-07-26
Publication date: 2024-02-20
Anticipated expiration: 2033-07-26

Abstract

The utility model provides a touch sensing device and three-dimensional forming equipment. The touch sensing device includes: a base; the detection assembly comprises a detection piece and a piezoelectric piece which are connected, and the detection piece is connected with the base body; the pressing assembly is movably connected with the base body, so that the pressing assembly can partially protrude out of the base body, and the pressing assembly moves relative to the base body and at least comprises a first position, at which the pressing assembly protrudes out of the base body and contacts with the detection piece; the pressing component is configured to be pushed by external pushing force to deform the detection piece when being in the first position, so that the piezoelectric piece sends a detection signal. Therefore, the height of the nozzle can be determined by utilizing the touch sensing device, and then the touch sensing device is matched with the leveling device, the offset of the leveling device and the nozzle can be determined, the printing height of the nozzle is determined according to the offset, automatic leveling is realized, manual operation of a user is simplified, and the adjustment efficiency is improved.

Description

Touch sensing device and three-dimensional forming equipment

Technical Field

The utility model relates to the technical field of printing equipment, in particular to a trough assembly and three-dimensional forming equipment.

Background

The three-dimensional forming equipment, such as hot-melt lamination type rapid forming equipment, the guide frame drives the printing head to descend to a preset position, the nozzle scans the spraying material selectively towards the printing platform according to the cross section shape of the product, the material is cooled to form a first layer of the printed product, the guide frame further drives the printing head to ascend by one layer, the second layer of printing is carried out on the basis of the first layer, and three-dimensional printing is realized by accumulating layer by layer.

The adhesion condition of the first layer of the printing product and the printing platform is very important, which is the basis of successful subsequent printing, and the initial relative distance between the nozzle and the printing platform plays an important role in forming the first layer of the model, so that in order to ensure that the material of the nozzle can be uniformly sprayed on the printing platform, the distance from each coordinate of the printing platform to the nozzle is necessary to be adjusted to be relatively stable, and therefore, a leveling device is usually arranged on the three-dimensional forming equipment and used for leveling the printing platform.

In the patent with publication number CN216127742U, a leveling device is connected to a print head, a print platform pushes a contact pin to rise, the upper end of the contact pin contacts with a metal spring, the metal spring contacts with a probe point on a circuit board to form a reflow circuit, and a signal is generated to obtain the height of the print platform. However, since the height of the printing platform is obtained by the leveling device, the actual position of the nozzle needs to be compensated according to the height difference between the contact pin and the nozzle, however, errors are generated when the nozzle and the leveling device are installed, so that the height difference between the contact pin and the nozzle cannot be accurately obtained, the height differences between the leveling devices of different three-dimensional forming equipment and the nozzle may be different, and a user needs to manually adjust the distance between the bottom end of the nozzle and the upper surface of the printing platform before printing starts to determine the offset between the nozzle and the height of the contact pin, so that the adjustment process is troublesome and the time is long.

Disclosure of Invention

In view of the above, the utility model provides a touch sensing device and a three-dimensional forming device, wherein the height of a nozzle can be determined by utilizing the touch sensing device, and then the touch sensing device is matched with a leveling device, so that the offset of the leveling device and the nozzle can be determined, the printing height of the nozzle is determined according to the offset, automatic leveling is realized, manual operation of a user is simplified, and the adjustment efficiency is provided.

In a first aspect of the present utility model, there is provided a touch sensing device for auto leveling of a stereolithography apparatus, the touch sensing device comprising: a base; the detection assembly comprises a detection piece and a piezoelectric piece which are connected, and the detection piece is connected with the base body; the pressing assembly is movably connected with the base body, so that the pressing assembly can partially protrude out of the base body, and the pressing assembly moves relative to the base body and at least comprises a first position, at which the pressing assembly protrudes out of the base body and contacts with the detection piece; the pressing component is configured to be pushed by external pushing force to deform the detection piece when being in the first position, so that the piezoelectric piece sends a detection signal.

Further, the detecting member is provided as an elastic member; the piezoelectric piece is configured to change an electrical state due to deformation of the detection piece; the piezoelectric element comprises a piezoelectric ceramic piece and a conductive material piece, wherein the conductive material piece is arranged in an annular structure and wrapped on the periphery of the piezoelectric ceramic piece, the piezoelectric element further comprises an insulating piece, and the piezoelectric ceramic piece and the conductive material piece are connected to the detecting piece through the insulating piece.

Further, the pressing assembly includes: the key cap is sleeved on the outer side of the key shaft and can move relative to the key shaft, the first elastic reset piece is located between the key shaft and the key cap so as to apply acting force far away from each other to the key shaft and the key cap, and the adjusting piece is used for being connected with the key shaft and the key cap so as to fix or loosen the relative positions of the key cap and the key shaft.

Further, the key shaft is provided with a positioning hole, the key cap is provided with an adjusting hole, and the adjusting piece penetrates through the adjusting hole to be connected with the positioning hole; the adjusting hole is a strip hole, the outer wall of the position of the key shaft, at least, of the positioning hole is of a plane structure, and the outer wall of the position of the key cap, at least, of the adjusting hole is of a plane structure.

Further, a first sliding hole is formed in the base body, at least part of the detection piece is exposed to the bottom opening of the first sliding hole or extends into the first sliding hole, a first boss is arranged on the hole wall of the first sliding hole, the key cap and the detection piece are positioned on two sides of the key shaft, part of the key shaft is limited between the first boss and the detection piece and can move along the first sliding hole, the first elastic reset piece is connected between the key cap and the key shaft so that the key cap moves to extend out of the top opening of the first sliding hole, and the key shaft is in butt joint or fixed connection with the detection piece;

The base body is provided with an avoidance hole communicated with the first sliding hole, and the avoidance hole is used for avoiding a tool for adjusting the adjusting piece.

Further, the key shaft comprises a base body and a supporting shaft, the base body is opposite to the detection piece so as to be connected with the detection piece or used for being abutted against the detection piece, the key cap is sleeved on the outer side of the supporting shaft from the bottom, and the first elastic reset piece is connected between the supporting shaft and the key cap; the bottom circumference side of the key cap is provided with an extension part opposite to the base body, and the extension part is used for being abutted with the first boss so as to limit the movement of the key cap and the key shaft relative to the first sliding hole.

Further, the bottom of the base body is provided with a mounting groove with the bottom communicated with the first sliding hole, the detection piece is mounted at the bottom of the mounting groove, and the piezoelectric piece is positioned at one side of the detection piece far away from the pressing component; the touch sensing device further comprises an electric control plate electrically connected with the piezoelectric piece, the electric control plate is connected to the opening of the mounting groove, and the electric control plate is used for amplifying detection signals; the pressing assembly further includes: the heat insulation piece is arranged at the top end of the key cap; the heat insulation piece comprises a heat insulation block and a plug which are connected, and the top end of the key cap is provided with a jack for accommodating the plug; the base body is used for being connected with the molding platform of three-dimensional molding equipment, and the tip of touching sensing device's pressing component is in the coplanar with the preset point position of molding platform's upper surface.

Further, the touch sensing device further includes: and the wiping component is connected with the base body and is used for interfering with the nozzle of the three-dimensional forming equipment to clean the nozzle.

Further, the base body is provided with a second sliding hole, the wiping component comprises a buffer mechanism and a wiping head, the buffer mechanism is positioned in the second sliding hole, and the wiping head is connected with the buffer mechanism and can extend out of the second sliding hole; wherein the wiping head comprises a silica gel piece; the buffer mechanism comprises an upper cover, a supporting seat and a second elastic resetting piece, the wiping head is connected with the upper cover, the supporting seat is connected with the base body, the upper cover is connected with the supporting seat through the second elastic resetting piece, and the second elastic resetting piece is used for applying acting force far away from the supporting seat to the upper cover; wherein, one of the inner walls of the upper cover and the second sliding hole is provided with a guide bulge, the other one is provided with a guide groove, and the guide bulge and the guide groove are matched to limit the movement of the upper cover relative to the second sliding hole; the periphery of the supporting seat is provided with a clamping groove, the outer wall of the base body is provided with a buckle, and the supporting seat is detachably buckled at the bottom of the base body through the buckle and the clamping groove; the middle part of the supporting seat is provided with a through hole, the upper cover comprises a supporting column and a bearing part which are connected, the bearing part is connected with the wiping head, the supporting column is movably inserted into the through hole, and the second elastic resetting piece is sleeved on the periphery of the supporting column and is positioned between the bearing part and the supporting seat; the pore wall of the second sliding hole is provided with a second boss, the bottom circumference side of the wiping head is provided with a convex part, and the second boss is abutted with the convex part to limit the movement of the wiping head relative to the second sliding hole.

In a second aspect of the present utility model, there is provided a stereolithography apparatus comprising: the touch sensing device according to any one of the first aspect and the forming platform, wherein an end of the pressing component of the touch sensing device is located in the same plane as a preset point on the upper surface of the forming platform.

Further, the stereolithography apparatus further includes: the device comprises a base, a guide assembly, a printing head assembly and a leveling device, wherein the printing head assembly comprises a nozzle; the printing head component and the forming platform are respectively connected with the base through the guide component; the touch sensing device is connected with the forming platform, and the nozzle is used for pushing the pressing component; the leveling device is connected with the printing head assembly and is used for sensing a preset point position to generate a leveling signal;

the guide assembly comprises a guide wheel, the guide wheel comprises a pulley outer ring, a first bearing, a second bearing and a gasket, a mounting hole is formed in the pulley outer ring, a limiting protrusion is arranged on the hole wall of the mounting hole, the first bearing and the second bearing are both positioned in the mounting hole, the first bearing and the second bearing are abutted with the limiting protrusion and are respectively positioned on two sides of the limiting protrusion, and the gasket is positioned between the first bearing and the second bearing;

the inner diameter of the gasket is larger than or equal to the diameter of the central round hole of the inner ring of the first bearing, and the outer diameter of the gasket is smaller than the inner diameter of the limiting bulge;

The inner diameter of the limiting bulge is larger than the diameter of the inner ring of the first bearing;

the inner wall of the mounting hole is also provided with a first groove corresponding to the first bearing position, and the inner wall of the mounting hole is also provided with a second groove corresponding to the second bearing position;

the pulley outer ring is a polyketone pulley outer ring.

The touch sensing device and the three-dimensional molding equipment provided by the embodiment of the utility model comprise: the base body, the detection component and the pressing component can be reasonably operated after the touch sensing device is mounted on the forming platform or the frame, so that the upper surface of the pressing component at the first position and a preset point position on the forming platform are located in the same plane. The pressing component at the first position is pushed by the nozzle, so that the piezoelectric piece can send a detection signal, and the height of the nozzle is obtained. Therefore, the leveling device matched with the three-dimensional forming equipment can acquire the height of the leveling device at the preset point position, further can determine the offset of the leveling device and the nozzle, and can determine the printing height of the nozzle according to the offset, so that automatic leveling is realized. Compared with the prior art that the offset between the height of the nozzle and the height of the contact pin are required to be manually determined and the user is required to have certain knowledge on the equipment, the full-automatic leveling printing is realized, and the automation degree and the leveling efficiency of the leveling device are improved.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. Wherein:

fig. 1 is a schematic structural diagram of a touch sensing device according to an embodiment of the utility model;

FIG. 2 shows an exploded view of the embodiment of FIG. 1;

FIG. 3 shows a cross-sectional view of the embodiment of FIG. 1 from one perspective;

FIG. 4 shows a cross-sectional view of the embodiment of FIG. 1 from another perspective;

FIG. 5 illustrates a cross-sectional view of the embodiment of FIG. 1 from yet another perspective;

FIG. 6 shows a schematic structural view of the embodiment of FIG. 1 from another perspective;

FIG. 7 shows a schematic structural view of a pressing assembly provided by an embodiment of the present utility model;

FIG. 8 shows a cross-sectional view of the embodiment of FIG. 7 from one perspective;

FIG. 9 is a schematic diagram of a detection assembly according to an embodiment of the present utility model;

fig. 10 is a schematic view showing the structure of a stereolithography apparatus according to an embodiment of the present utility model;

FIG. 11 shows a schematic structural view of the embodiment of FIG. 10 from another perspective;

fig. 12 is a schematic view showing a structure in which a pressing member of the collision sensing apparatus of the embodiment shown in fig. 10 protrudes from a printing platform;

FIG. 13 shows an enlarged partial schematic view at A of the embodiment of FIG. 12;

fig. 14 is a schematic structural view of the collision sensing apparatus according to the embodiment shown in fig. 10 when the pressing assembly and the preset point of the printing platform are located on the same plane;

FIG. 15 shows an enlarged partial schematic view at B of the embodiment of FIG. 14;

FIG. 16 shows an exploded view of a guide wheel provided by one embodiment of the present utility model;

FIG. 17 illustrates a cross-sectional view of a pulley outer ring provided by an embodiment of the present utility model;

FIG. 18 illustrates a cross-sectional view of a first bearing provided by an embodiment of the present utility model;

FIG. 19 shows a cross-sectional view of a second bearing provided by an embodiment of the utility model;

fig. 20 shows a cross-sectional view of a gasket provided by an embodiment of the present utility model.

The correspondence between the reference numerals and the component names in fig. 1 to 20 is:

the device comprises a sensing device body, a base body, a first sliding hole, a first boss 1111, a 112 avoidance hole, a second sliding hole, a 1131 second boss, a 114 mounting groove, a 115 buckle, a 120 detection component, a 121 detection component, a 122 piezoelectric component, a 123 piezoelectric ceramic plate, a 124 conductive material component, a 130 pressing component, a 131 key shaft, a 1311 seat body, a 1312 supporting shaft, a 132 key cap, a 1321 jack, a 1322 extension part, a 133 first elastic reset component, a 134 regulation component, a 135 positioning hole, a 136 regulation hole, a 137 heat insulation component, a 1371 heat insulation block, a 1372 plug, a 140 electric control board, a 150 wiping component, a 151 wiping head, a 1511 convex part, a 152 buffer mechanism, a 153 upper cover, a 1531 support column, a 1532 bearing part, a 154 supporting seat, a 1541 through hole, a 155 second elastic reset component, a 156 guide boss, a 157 clamping groove, a 200 three-dimensional forming device, a 210 base, a 220 bearing component, a 221 guide wheel, a 222 pulley outer ring, a 2221 mounting hole, a 2 limit boss, a 3 first groove, a 2224 second groove, a 223, a first bearing component, a 224, a bearing head, a 230 leveling device, a bearing components, a 2222, a leveling device, a bearing parts, a 260 and a leveling device.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

The touch sensing device 100 and the stereoscopic forming apparatus 200 provided according to some embodiments of the present utility model, which may be a hot-melt lamination type rapid prototyping apparatus, are described below with reference to fig. 1 to 20, and the touch sensing device 100 may be applied to the stereoscopic forming apparatus 200.

As shown in fig. 10 and 11, the stereolithography apparatus 200 includes a molding stage 240 and a printhead assembly 230, the printhead assembly 230 including a nozzle 231, the nozzle 231 of the printhead assembly 230 being capable of ejecting molten consumables on the molding stage 240 to form a mold. The stereolithography apparatus 200 further includes a leveling device 250, where the leveling device 250 is configured to detect the molding platform 240 of the stereolithography apparatus 200 to level the printhead assembly 230.

Specifically, as shown in fig. 10 and 11, the stereo lithography apparatus 200 further includes a base 210 and a guide assembly 220, where the print head assembly 230 and the lithography platform 240 are respectively connected to the base 210 through the guide assembly 220, and the guide assembly 220 is used to drive the print head assembly 230 and the lithography platform 240 to move, so that the leveling device 250 sequentially contacts with a plurality of preset points on the lithography platform 240, and in the actual use process, the plurality of preset points of the lithography platform 240 can be detected through the above steps, so that the flatness of the surface of the lithography platform 240 can be obtained, and the profile height information of the surface of the lithography platform 240 can be obtained. In this way, in the printing process, according to the contour height information of the surface of the forming platform 240 and the relative position information of the printing head nozzle 231 and the leveling device 250, the height of the printing head nozzle 231 is compensated, so that the height of the nozzle 231 and the upper surface of the forming platform 240 can be ensured to be kept relatively fixed all the time, and the reliability and accuracy of model printing are further improved.

In the three-dimensional forming equipment in the related art, the compensation values of the nozzle and the leveling device are adjusted by manual operation of a user after each leveling, the adjustment process can be confirmed after the effect is seen in the machine printing, and the adjustment process is troublesome and consumes waiting time.

In view of this, as shown in fig. 1, 2 and 3, an embodiment of the present utility model provides a touch sensing device 100 for auto leveling of a stereolithography apparatus 200, the touch sensing device 100 comprising: a base 110; the detection assembly 120, the detection assembly 120 includes a detection member 121 and a piezoelectric member 122 connected, the detection member 121 is connected with the base 110; the pressing assembly 130 is movably connected with the base 110, so that the pressing assembly 130 can partially protrude out of the base 110, and the pressing assembly 130 moves relative to the base 110 at least including a first position where the pressing assembly 130 protrudes out of the base 110 and contacts with the detecting piece 121; wherein the pressing assembly 130 is configured to be deformed by external pushing force to push the detecting member 121 when in the first position, so that the piezoelectric member 122 transmits the detection signal.

The base 110 of the touch sensing device 100 may be connected to the molding platform 240 or the frame of the stereoscopic molding apparatus 200, and thus, the entire touch sensing device 100 may be mounted on the molding platform 240 or the frame using the base 110. Specifically, the base 110 may be connected to the forming platform 240 or the frame by at least one of a screw, a fastening structure, a mortise and tenon structure, a bonding structure, and the like. Wherein, the frame may include a guide assembly 220 and a base 210, i.e., the touch sensing device 100 may be disposed on the guide assembly 220 or the base 210 through the base 110. The base 110 is coupled to the forming table 240 either directly or indirectly through other components.

In this embodiment, the touch sensing device 100 includes: the base 110, the detecting component 120 and the pressing component 130, the pressing component 130 is movably connected with the base 110, so that the pressing component 130 moves relative to the base 110 until part of the pressing component 130 protrudes out of the base 110, the detecting piece 121 of the detecting component 120 is connected to the base 110, and the pressing component 130 moves relative to the base 110 at least including a first position where the pressing component 130 protrudes out of the base 110 and contacts with the detecting piece 121, so that after the touch sensing device 100 is mounted on the forming platform 240 or the frame, the upper surface of the pressing component 130 in the first position and a preset point on the forming platform 240 can be located in the same plane through reasonable operation. When the nozzle 231 descends to touch the upper surface of the pressing assembly 130 at the first position, the pressing assembly 130 is forced to move relative to the base 110 to push the detecting member 121, for example, the detecting member 121 is deformed, so that the piezoelectric member 122 sends a detection signal, and the control device of the stereo lithography apparatus 200 acquires the first height information of the nozzle 231 of the printhead assembly 230 when acquiring the detection signal.

Specifically, the bottom of the pressing component 130 may be separately disposed from the detecting member 121, so that after the nozzle 231 descends to touch the upper surface of the pressing component 130 in the first position, the pressing component 130 is forced to move relative to the base 110 to collide with the detecting member 121, so that the detecting member 121 deforms, and the piezoelectric member 122 sends a detection signal. Alternatively, the bottom of the pressing component 130 may be connected to the detecting element 121, so after the nozzle 231 descends to touch the upper surface of the pressing component 130 at the first position, the entire pressing component moves relative to the base 110, and drives the detecting element 121 to move synchronously, and the detecting element 121 is still pushed to deform under the action of inertia, so that the piezoelectric element 122 sends a detection signal, and the piezoelectric element 122 senses sensitivity, and the slight deformation of the detecting element 121 can be sensed.

Since the upper surface of the pressing component 130 is in the same plane with the preset point of the molding platform 240 when the nozzle 231 collides with the upper surface of the pressing component 130, and the pressing component 130 touches the detecting component 121 to make the deformation displacement of the detecting component 121 smaller, the first height information can be regarded as the height of the printhead component 230 when the nozzle 231 touches the preset point. Then, the leveling device 250 installed on the printhead assembly 230 may be used to sense the position of the preset position, and the second height information of the printhead assembly 230 is obtained according to the leveling signal generated by the leveling device 250, that is, the heights of the printhead assembly 230 when the nozzle 231 and the leveling device 250 touch the same preset position on the forming platform 240 are respectively obtained, and the offset of the nozzle 231 and the leveling device 250 can be obtained through the difference between the first height information and the second height information. Therefore, the distance between the nozzle 231 and the forming platform 240 can be adjusted according to the offset, so that the first layer of the model can be better attached to the surface of the forming platform 240 when the model is printed, stronger adhesive force is achieved, and the printing quality of the model is improved. Meanwhile, compared with the leveling device in the related art that the offset between the nozzle and the leveling device needs to be manually determined and a user needs to have a certain knowledge on equipment, the method provided by the embodiment can avoid the step of manually adjusting the distance between the nozzle 231 and the forming platform 240 by the user after the leveling is finished, realizes full-automatic leveling printing, has higher adjustment accuracy, improves the automation degree of the leveling device 250, reduces the dependence of the user on the familiarity of the equipment, and enables a novice to use the three-dimensional forming equipment 200 to realize a better printing effect.

That is, the stereoscopic forming apparatus 200 provided by the utility model, through arranging the collision sensing device 100 on the stereoscopic forming apparatus 200 and matching with the original leveling device 250 of the stereoscopic forming apparatus 200, realizes automatic measurement of the offset of the nozzle 231 of the printing head and the leveling device 250 while solving the leveling detection problem, and can calculate a correct compensation value according to the offset, so that the guide assembly 220 can automatically adjust the distance between the nozzle 231 of the printing head and the forming platform 240 according to the offset, thereby improving the degree of intellectualization of the leveling device 250, solving the problem that the user manually adjusts the distance between the nozzle of the printing head and the forming platform to compensate the offset between the nozzle of the printing head and the adjusting device, simplifying the user operation, reducing the familiarity dependence of the user on the stereoscopic forming apparatus, expanding the application range, and being beneficial to improving the accuracy, reliability and rapidity of the distance adjustment of the nozzle 231 of the printing head and the forming platform 240.

The pressing component 130 at the first position protrudes from the base 110 and contacts with the detecting element 121, so that the upper surface of the pressing component 130 can be in the same plane with a preset point on the forming platform 240, and the nozzle 231 can be ensured to smoothly touch the pressing component 130 protruding from the base 110, meanwhile, the pressing component 130 can move relative to the base 110 to sensitively collide with the detecting element 121, and the piezoelectric element 122 sends a detection signal, so that the sensitivity and accuracy of detection of the detecting component 120 are improved.

The piezoelectric member 122 is an information function member capable of converting mechanical energy and electrical energy into each other, and specifically, the piezoelectric member 122 refers to an element that generates a voltage by applying a force. Therefore, the piezoelectric member 122 can send the detection signal when the detection member 121 receives the impact force or deforms, that is, one piezoelectric member 122 is matched with the detection member 121 to send the detection signal, and the detection member 121 is not a conductive device, so that compared with the related art that two conductive devices are required to be matched to send the detection signal, the structure is simplified, and the detection member 121 and the piezoelectric member 122 are low in manufacturing precision and cost compared with the conductive devices, which is beneficial to reducing the manufacturing cost of the collision sensing assembly, extending the service life of the collision sensing assembly and providing the reliability of the collision sensing assembly.

As shown in fig. 2 and 9, in some possible embodiments provided by the present utility model, the detecting member 121 is provided as an elastic member; the piezoelectric element 122 is configured to change an electrical state by deformation of the detecting element 121. Therefore, after the pressing assembly 130 at the first position is impacted by the nozzle 231, the pressing assembly 130 transmits the pressure to the detecting member 121 contacting the pressing assembly 130, and the detecting member 121 is an elastic member, so that the detecting member 121 can be deformed, and the piezoelectric member 122 can be deformed to change the electrical state due to the deformation of the detecting member 121, and a detecting signal is sent.

Specifically, the detecting element 121 is an elastic plate, for example, the detecting element 121 is a spring plate, an elastic plastic plate, or the like, where the spring plate can sensitively sense the collision of the pressing component 130 to deform, thereby being beneficial to improving the sensitivity and reliability of the detection of the detecting component 120, and meanwhile, the spring plate has low cost and low manufacturing precision, and is beneficial to saving cost.

The change of the electrical state may be a change of the on state and the off state, or a change of different electrical signal intensities, such as a change of voltage emphasis.

As shown in fig. 9, in the above embodiment, the piezoelectric member 122 includes the piezoelectric ceramic plate 123 and the conductive material member 124, the conductive material member 124 is provided in a ring-like structure and wrapped around the periphery of the piezoelectric ceramic plate 123, the piezoelectric member 122 further includes an insulating member, and the piezoelectric ceramic plate 123 and the conductive material member 124 are connected to the detecting member 121 through the insulating member.

The piezoelectric ceramic plate 123 is manufactured by using a piezoelectric effect, which is a bound electric charge with opposite signs on the surfaces of two ends of a material, caused by the polarization of the material caused by the relative displacement of the centers of positive and negative charges inside the material under the action of mechanical stress.

The conductive material member 124 may be a conductive metal member, or a conductive composite material member, wherein the conductive metal member may be copper, aluminum, silver, or the like. Specifically, the conductive material member 124 may be a copper ring, and the copper ring is wrapped around the periphery of the piezoelectric ceramic plate 123, so that the change condition of the bound charges on the two end surfaces of the piezoelectric ceramic plate 123 can be accurately sensed, so as to ensure a precise detection effect.

Wherein, the insulating member may be an insulating sleeve or an insulating pad, and the piezoelectric ceramic piece 123 and the conductive material piece 124 may be mounted or adhered on the insulating sleeve or the insulating pad, and then the insulating sleeve or the insulating pad is mounted on the detecting member 121 by means of adhesion, clamping, screwing, etc., thereby fixing the whole piezoelectric piece 122 on the detecting member 121, and simultaneously ensuring the insulation between the piezoelectric piece 122 and the detecting member 121.

As shown in fig. 1, 2, 3 and 4, in some possible implementations provided by the present utility model, the pressing assembly 130 includes: the key shaft 131, the key cap 132, the first elastic reset member 133 and the adjusting member 134, the key cap 132 is sleeved on the outer side of the key shaft 131 and can move relative to the key shaft 131, the first elastic reset member 133 is located between the key shaft 131 and the key cap 132 to apply a force to the key shaft 131 and the key cap 132 far away from each other, and the adjusting member 134 is used for being connected with the key shaft 131 and the key cap 132 to fix or loosen the relative positions of the key cap 132 and the key shaft 131.

In this embodiment, the setting of the adjusting member 134 can fix or loosen the relative positions of the key cap 132 and the key shaft 131, so, when the adjusting member 134 fixes the relative positions of the key cap 132 and the key shaft 131, the key cap 132 and the key shaft 131 cannot move relatively, at this time, the key cap 132 and the key shaft 131 can move as a whole relative to the base 110, so, the pressing assembly 130 in the first position fixes the relative positions of the key cap 132 and the key shaft 131 through the adjusting member 134, so that after the pressing assembly 130 is impacted by an external force, the whole pressing assembly 130 can move relative to the base 110, so that the pressing assembly 130 can impact the detecting member 121 sensitively and accurately, and the detecting precision of the detecting assembly 120 is improved.

When the adjusting member 134 loosens the relative positions of the key cap 132 and the key shaft 131, the key cap 132 and the key shaft 131 can move relatively, at this time, the relative positions of the key cap 132 and the key shaft 131 can be adjusted by means of the leveling fitting 260, so that the upper surface of the key cap 132 of the pressing assembly 130 protrudes out of the base 110 and is in the same plane with the preset point of the forming platform 240, the key shaft 131 is abutted to the detecting member 121 under the action of the first elastic reset member 133, the pressing assembly 130 is in the first position, and then the relative positions of the key cap 132 and the key shaft 131 are locked by the adjusting member 134, so that the key cap 132 and the key shaft 131 as a whole can move relative to the base 110, and therefore, in cooperation with the detecting assembly 120, the detection of the height of the nozzle 231 at the preset point of the forming platform 240 can be realized.

The first elastic restoring member 133 may be a spring connected between the key cap 132 and the key shaft 131.

As shown in fig. 2 and 5, in some possible embodiments of the present utility model, the key shaft 131 is provided with a positioning hole 135, the key cap 132 is provided with an adjusting hole 136, and the adjusting member 134 passes through the adjusting hole 136 to be connected with the positioning hole 135, where the adjusting hole 136 is a strip hole.

Thus, after the relative positions of the key shaft 131 and the key cap 132 are adjusted, the relative positions of the key shaft 131 and the key cap 132 can be fixed by the adjusting member 134, so that the key shaft 131 and the key cap 132 are integrated.

Specifically, the positioning hole 135 may be a threaded hole, the adjusting hole 136 is a long-strip hole, the opening direction of the long-strip hole extends along the vertical direction, and the adjusting member 134 is a bolt, so that when the adjusting member 134 extends to the adjusting hole 136 and does not extend into the positioning hole 135, the key cap 132 and the key shaft 131 can relatively move within a range defined by the adjusting hole 136 under the action of the first elastic restoring member 133. When the relative positions of the key cap 132 and the key shaft 131 are in the proper positions, the adjusting member 134 extending into the adjusting hole 136 continues to extend into the positioning hole 135 to be connected with the positioning hole 135, so that the relative positions of the key cap 132 and the key shaft 131 can be fixed.

As shown in fig. 2 and 4, in the above embodiment, the outer wall of the key shaft 131 at least at the location of the positioning hole 135 has a planar structure, and the outer wall of the key cap 132 at least at the location of the adjusting hole 136 has a planar structure. By the arrangement, the opposite wall surfaces of the positioning holes 135 and the adjusting holes 136 on the key shaft 131 and the key cap 132 are of a planar structure, and the opposite wall surfaces of the adjusting holes 136 and the adjusting pieces 134 on the key cap 132 are of a planar structure, so that the reliability of connection between the adjusting pieces 134 and the key shaft 131 and the reliability of connection between the adjusting pieces 134 and the key cap 132 can be improved, the relative positions of the key shaft 131 and the key cap 132 can be reliably and stably locked by the adjusting pieces 134, the possibility of relative movement of the key shaft 131 and the key cap 132 can be reduced, and the detection accuracy of the collision sensing device can be improved.

Meanwhile, the arrangement of the plane structure plays a good limiting role, so that the relative movement of the key cap 132 and the key shaft 131 cannot rotate.

As shown in fig. 2, 3 and 4, in some possible embodiments of the present utility model, the base 110 is provided with a first sliding hole 111, at least a portion of the detecting member 121 is exposed to a bottom opening of the first sliding hole 111 or extends into the first sliding hole 111, a wall of the first sliding hole 111 is provided with a first boss 1111, the key cap 132 and the detecting member 121 are located at both sides of the key shaft 131, a portion of the key shaft 131 is limited between the first boss 1111 and the detecting member 121 and is movable along the first sliding hole 111, and a first elastic restoring member 133 is connected between the key cap 132 and the key shaft 131 to move the key cap 132 to extend out of a top opening of the first sliding hole 111, and the key shaft 131 is in contact with the detecting member 121.

The pressing assembly 130 is movably disposed in the first sliding hole 111, and a portion of the detecting member 121 is exposed at a bottom opening of the first sliding hole 111 or extends into the first sliding hole 111, so that the pressing assembly 130 moves along the first sliding hole 111 after being stressed, and can collide with the detecting member 121 to deform the detecting member 121.

The key caps 132 and the detecting members 121 are located at two sides of the key shaft 131, that is, from vertical direction to top, the key caps 132, the key shaft 131 and the detecting members 121 are located in sequence, wherein, in the Z-axis direction shown in the vertical direction 3, as shown in fig. 4, a first boss 1111 is disposed on a hole wall of the first sliding hole 111, a part of the key shaft 131 is limited between the first boss 1111 and the detecting members 121 and can move along the first sliding hole 111, and a part of the key caps 132 is located between the first boss 1111 and the key shaft 131, thereby, it can be ensured that the key caps 132 are not separated from the base 110, it can be ensured that the pressing assembly 130 is not separated from the top opening of the first sliding hole 111, and reliability of the collision sensing device is ensured. The first elastic restoring member 133 is located in the first sliding hole 111 and is connected between the key cap 132 and the key shaft 131, and the first elastic restoring member 133 applies a force to the key cap 132 and the key base away from each other, so that the key cap 132 can extend out of the top of the first sliding hole 111, and the key shaft 131 is abutted or fixedly connected with the detecting member 121. Thus, the extending length of the key cap 132 can be adjusted through the leveling fitting 260, so that the upper surface of the key cap 132 is in the same plane with the preset point of the molding platform 240, and the pressing assembly 130 is in the first position.

As shown in fig. 2 and 6, in the above embodiment, the base 110 is provided with the avoidance hole 112 that is in communication with the first sliding hole 111, and the avoidance hole 112 is used for avoiding the tool for adjusting the adjusting member 134, so that, outside the base 110, the tool passes through the avoidance hole 112 to operate the adjusting member 134, and further, the adjusting operation of the adjusting member 134 is achieved, such as fixing and loosening of the relative positions of the key shaft 131 and the key cap 132 is achieved, and the operation is simple and the use is convenient. In particular, the tool for adjusting adjustment key 134 may be a wrench, screwdriver, or other tool.

As shown in fig. 3, 4, 7 and 8, in some possible embodiments of the present utility model, the key shaft 131 includes a base 1311 and a support shaft 1312, where the base 1311 is opposite to the detecting element 121 to connect the detecting element 121 or is used to abut against the detecting element 121, the key cap 132 is sleeved outside the support shaft 1312 from the bottom, and the first elastic restoring element 133 is connected between the support shaft 1312 and the key cap 132. Therefore, when the adjusting member 134 releases the relative positions of the key shaft 131 and the key cap 132, the key shaft 131 and the key cap 132 are separated from each other along the first sliding hole 111 under the action of the first elastic restoring member 133, so that the seat 1311 of the key shaft 131 can abut against the detecting member 121 and cannot influence the deformation of the detecting member 121, or the seat 1311 of the key shaft 131 drives the detecting member 121 to move in a direction away from the key cap 132 and cannot influence the deformation of the detecting member 121. The key cap 132 protrudes out of the top opening of the first sliding hole 111, i.e., the upper surface of the key cap 132 protrudes out of the upper surface of the base 110.

It will be appreciated that, at this time, as shown in fig. 12 and 13, the upper surface of the key cap 132 may protrude from the molding platform 240, the upper surface of the key cap 132 and the preset point of the molding platform 240 are defined in the same plane by using the leveling fitting 260, for example, the leveling fitting 260 is in a planar structure, the leveling fitting 260 is placed at the preset point of the molding platform 240 and on the upper surface of the key cap 132, and the upper surface of the key cap 132 and the preset point of the molding platform 240 are defined in the same plane by pressing the upper surface of the key cap 132 by using the leveling fitting 260, as shown in fig. 14 and 15. Since the key shaft 131 abuts against the detecting member 121 under the action of the first elastic restoring member 133, the pressing assembly 130 is at the first position, and the adjusting member 134 can lock the relative positions of the key cap 132 and the key shaft 131 for subsequent detection.

Wherein, the key cap 132 is sleeved outside the support shaft 1312 by the bottom, the setting of the support shaft 1312 plays a good guiding role for the relative motion of the key cap 132 and the key shaft 131, and under the cooperation of the first sliding hole 111 and the planar structure, the key cap 132 and the key shaft 131 can move along the vertical direction smoothly along the support shaft 1312 and the first sliding hole 111 without rotating, so as to improve the detection precision of the touch sensing device 100.

Wherein, the top of the supporting shaft 1312 of the key shaft 131 is provided with a mounting opening, one end of the first elastic restoring member 133 is located in the mounting opening, and the other end is abutted to the key cap.

The bottom peripheral side of the key cap 132 is provided with an extension portion 1322 opposite to the seat 1311, and the extension portion 1322 is configured to abut against the first boss 1111 to limit movement of the key cap 132 and the key shaft 131 relative to the first sliding hole 111. Thereby, the key cap 132 and the key shaft 131 can be reliably defined between the first boss 1111 and the detecting member 121, ensuring that the key cap 132 is not separated from the first sliding hole 111, and the upper surface of the key cap 132 can protrude outside the first sliding hole 111 by the first elastic restoring member 133, and the key shaft 131 can be in contact with the detecting member 121.

It will be appreciated that, under the action of the first elastic restoring member 133, the contact between the key shaft 131 and the detecting member 121 does not deform the detecting member 121 to enable the piezoelectric member 122 to send the detecting signal, that is, the pressure transmitted to the detecting member 121 by the first elastic restoring member 133 through the key shaft 131 is smaller than the pressure transmitted to the detecting member 121 by the nozzle 231 through the pressing assembly 130.

As shown in fig. 3, 4 and 5, in some possible embodiments of the present utility model, a mounting groove 114 with a groove bottom communicating with the first sliding hole 111 is formed at the bottom of the base 110, the detecting member 121 is mounted at the groove bottom of the mounting groove 114, and the piezoelectric member 122 is located at a side of the detecting member 121 away from the pressing assembly 130.

In this embodiment, since the groove bottom of the mounting groove 114 communicates with the first sliding hole 111, when the detecting member 121 is mounted at the groove bottom of the mounting groove 114, a portion of the detecting member 121 can be exposed to the first sliding hole 111, thereby allowing the key shaft 131 within the first sliding hole 111 to be brought into contact with the detecting member 121 after being moved. The piezoelectric element 122 is located on a side of the detecting element 121 away from the pressing component 130, so that the piezoelectric element 122 can sensitively sense the deformation of the detecting element 121 to send a detection signal, and meanwhile, the piezoelectric element 122 does not occupy the space of the first sliding hole 111, so that the movement of the pressing component 130 relative to the base 110 is not interfered. In addition, the piezoelectric member 122 and the detecting member 121 are both positioned in the mounting groove 114, so that the pressing assembly 130 and the detecting member 121 are convenient to assemble and disassemble, and the assembly efficiency and the maintenance efficiency are improved.

As shown in fig. 2, 3, 4 and 5, in some possible embodiments of the present utility model, the touch sensing device 100 further includes an electric control board 140 electrically connected to the piezoelectric element 122, the electric control board 140 is connected to the opening of the mounting slot 114, and the electric control board 140 is used for amplifying the detection signal. Therefore, the electric control plate 140 is electrically connected with the piezoelectric workpiece 122, and meanwhile, the electric control plate 140 is electrically connected with the control device of the three-dimensional forming equipment 200, so that the control device of the three-dimensional forming equipment 200 can accurately, reliably and timely acquire detection signals, and accuracy and timeliness of leveling operation are improved. Moreover, the electric control plate 140 can well cover and shield the piezoelectric element 122 in the mounting groove 114, so as to prolong the service life of the piezoelectric element 122 and improve the reliability of the piezoelectric element 122.

It will be appreciated that the electrical control board 140 may close a portion of the opening of the mounting slot 114, or may close all of the opening of the mounting slot 114.

As shown in fig. 6, 7 and 8, in some possible embodiments provided by the present utility model, the pressing assembly 130 further includes: the heat insulator 137 is disposed at the top end of the key cap 132. The arrangement of the heat insulating piece 137 plays a good heat insulating role, avoids the influence on the detection result caused by the fact that the high-temperature nozzle 231 is directly contacted with the pressing cap to melt the pressing cap, and is further beneficial to improving the accuracy of the detection result.

As shown in fig. 8, the heat insulating member 137 includes a heat insulating block 1371 and a plug 1372 connected to each other, and the top end of the key cap 132 is provided with a socket 1321 for receiving the plug 1372, so that the heat insulating member 137 can be inserted into the top end of the key cap 132. It will be appreciated that the key cap 132 is removably attached to the heat shield 137 to facilitate replacement of the heat shield 137.

Wherein, the heat insulation block 1371 of the heat insulation member 137 is made of heat insulation material, such as rubber. Because in the process of detecting the height of the printhead assembly 230, the printhead assembly 230 needs to be heated, so that the printhead assembly 230 is in a printing environment, the height detection is more accurate, the temperature of the nozzle 231 can be raised due to the heating of the printhead assembly 230, the heat insulation piece 137 is arranged, the nozzle 231 with high temperature can be prevented from directly contacting the part of the pressing piece which is not resistant to high temperature, and the local melting of the key cap 132 is prevented from affecting the accuracy of the detection result.

The base 110 is used for being connected with the molding platform 240 of the stereo molding device 200, and the end of the pressing component 130 of the touch sensing device 100 is located in the same plane with a preset point on the upper surface of the molding platform 240. It is understood that the end of the pressing assembly 130 in the same plane as the preset point of the upper surface of the molding stage 240 may be the upper surface of the pressing assembly 130, and in particular, when the pressing assembly 130 includes the heat insulating member 137, the upper surface of the pressing assembly 130 may be understood as the upper surface of the heat insulating member 137, i.e., the top surface of the heat insulating member 137 may be in the same plane as the preset point of the molding stage 240, and when the pressing assembly 130 does not include the heat insulating member 137, the upper surface of the key cap 132 may be understood as the upper surface of the pressing assembly 130.

As shown in fig. 1, 2, 3 and 6, in some possible embodiments of the present utility model, the touch sensing device 100 further includes: and a wiper member 150 coupled to the base 110, the wiper member 150 being configured to interfere with the nozzle 231 of the stereolithography apparatus 200 to clean the nozzle 231.

In view of the foregoing, the touch sensing device 100 is used for obtaining the height of the nozzle 231 at the preset point of the forming platform 240, which provides a basis for leveling the forming platform 240. In order to ensure the accuracy of the height detection of the nozzle 231, the height detection environment of the nozzle 231 is close to the working environment in the actual printing process, in the detection process, the nozzle 231 is generally heated, the printing consumables remaining in the nozzle 231 are melted by heat and overflow to the outside of the nozzle 231 under the action of gravity, or the consumable overflow caking is generated before the nozzle 231 is detected, which leads to errors in the detection result after the nozzle 231 touches the touch sensing device 100. Through setting up the wiping subassembly 150, after nozzle 231 heats, before the detection begins, through cleaning nozzle 231, can utilize cleaner nozzle 231 to touch sensing device 100 to improve the accuracy of touch sensing device 100 testing result, and then improve the accuracy of nozzle 231 height detection.

As shown in fig. 1, 2 and 3, in some possible embodiments provided by the present utility model, the base 110 is provided with a second sliding hole 113, and the wiping assembly 150 includes a buffer mechanism 152 and a wiping head 151, the buffer mechanism 152 is located in the second sliding hole 113, and the wiping head 151 is connected to the buffer mechanism 152 and extends beyond the second sliding hole 113.

Thereby, the nozzle 231 interferes with the wiping head 151 protruding out of the second slide hole 113, and the cleaning operation of the nozzle 231 can be performed. The wiping head 151 includes a silica gel piece, which has good cleaning performance and deformability, can ensure the cleaning effectiveness of the nozzle 231, and does not damage the nozzle 231, thereby being beneficial to improving the service life of the nozzle 231.

The buffer mechanism 152 is disposed, so that the wiping head 151 can move relative to the base 110 along with deformation of the buffer mechanism 152, and therefore, in the process that the nozzle 231 extrudes the wiping head 151, the buffer mechanism 152 is stressed to deform to drive the wiping head 151 to move, and meanwhile, the buffer mechanism 152 can apply a force close to the nozzle 231, so that the wiping head 151 is ensured to reliably contact with the nozzle 231 to ensure a good cleaning effect, and meanwhile, the wiping head 151 cannot rigidly contact with the nozzle 231 to damage the nozzle 231, thereby being beneficial to prolonging the service lives of the wiping head 151 and the nozzle 231.

As shown in fig. 2 and 3, in some possible embodiments of the present utility model, the buffer mechanism 152 includes an upper cover 153, a support base 154, and a second elastic restoring member 155, the wiping head 151 is connected to the upper cover 153, the support base 154 is connected to the base 110, the upper cover 153 and the support base 154 are connected by the second elastic restoring member 155, and the second elastic restoring member 155 is used to apply a force to the upper cover 153 away from the support base 154. Therefore, when the nozzle 231 presses the wiping head 151 to descend, the upper cover 153 compresses the second elastic restoring member 155 to provide a certain moving space for the wiping head 151, and meanwhile, the second elastic restoring member 155 provides a force to the upper cover 153 away from the supporting seat 154 so that the wiping head 151 reliably contacts with the nozzle 231, thereby playing a role of buffering, being beneficial to ensuring a good cleaning effect and improving the reliability of the wiping head 151 and the nozzle 231.

The second elastic restoring member 155 may be a spring, which is a standard member, and has low cost.

The supporting seat 154 may be fixedly connected with the base 110, or may be detachably connected with the base 110, which is beneficial to improving the reliability of connection between the buffer mechanism 152 and the base 110, and the detachable connection facilitates replacement and maintenance of the buffer mechanism 152.

As shown in fig. 2, in the above embodiment, one of the upper cover 153 and the inner wall of the second sliding hole 113 is provided with a guide projection 156, and the other is provided with a guide groove, and the guide projection 156 and the guide groove are adapted to limit the movement of the upper cover 153 with respect to the second sliding hole 113, thereby ensuring that the upper cover 153 moves smoothly and reliably in the vertical direction within the second sliding hole 113 without rotating, so as to ensure a good cushioning effect.

Specifically, as shown in fig. 2, a guide protrusion 156 is provided on the circumferential side of the upper cover 153, and a guide groove is provided on the inner wall of the second sliding hole 113, the guide groove extending in the vertical direction.

As shown in fig. 2 and 6, in some possible embodiments of the present utility model, a clamping groove 157 is formed on a peripheral side of the supporting seat 154, a buckle 115 is formed on an outer wall of the base 110, and the supporting seat 154 is detachably fastened to a bottom of the base 110 through the buckle 115 and the clamping groove 157. Therefore, the buffer mechanism 152 can be conveniently and rapidly assembled and disassembled with the base 110, which is beneficial to improving the assembly efficiency and the maintenance efficiency.

In some possible embodiments of the present utility model, as shown in fig. 3, a through hole 1541 is formed in the middle of the supporting seat 154, the upper cover 153 includes a supporting column 1531 and a bearing portion 1532 connected to each other, the bearing portion 1532 is connected to the wiping head 151, the supporting column 1531 is movably inserted into the through hole 1541, and the second elastic restoring member 155 is sleeved on a peripheral side of the supporting column 1531 and located between the bearing portion 1532 and the supporting seat 154. Therefore, when the nozzle 231 extrudes the wiping head 151 to move downwards, the supporting column 1531 is driven by the bearing part 1532 to move downwards along the through hole 1541, and under the action of the second elastic reset element 155, the wiping head 151 can be stably and reliably abutted with the nozzle 231 to ensure a good cleaning effect, and meanwhile, the nozzle 231 can be buffered to a certain extent, so that the reliability of the nozzle 231 and the wiping head 151 is improved.

The bearing portion 1532 and the wiping head 151 may be connected by a fastening structure, a mortise and tenon structure, a screw structure, an adhesive, or the like, which is not particularly limited.

As shown in fig. 3, in some possible embodiments of the present utility model, the hole wall of the second sliding hole 113 is provided with a second boss 1131, the bottom peripheral side of the wiping head 151 is provided with a protrusion 1511, and the second boss 1131 abuts against the protrusion 1511 to limit the movement of the wiping head 151 relative to the second sliding hole 113, so that a part of the wiping head 151 can be reliably limited in the second sliding hole 113, so that the bearing part 1532 is limited in the second sliding hole 113, and the bearing part 1532 is prevented from being separated from the second sliding hole 113 to damage the wiping assembly 150, which is beneficial to improving the reliability of the wiping assembly 150.

As shown in fig. 10 to 15, a second aspect of the present utility model provides a stereolithography apparatus 200, comprising: the molding platform 240, and the touch sensing device 100 according to any one of the first aspect, wherein an end of the pressing component 130 of the touch sensing device 100 is located in the same plane as a predetermined point on the upper surface of the molding platform 240. Since the stereo lithography apparatus 200 includes the touch sensing device 100 according to any of the embodiments of the first aspect, all the beneficial effects of the touch sensing device 100 are provided and are not described herein.

Further, as shown in fig. 10 and 11, the stereolithography apparatus 200 further includes: a base 210, a guide assembly 220, a printhead assembly 230, and a leveling device 250, the printhead assembly 230 including a nozzle 231; the printhead assembly 230 and the modeling platform 240 are coupled to the base 210 via the guide assembly 220, respectively; the touch sensing device 100 is connected with the molding platform 240, and the nozzle 231 is used for pushing the pressing assembly 130; a leveling device 250 is coupled to the printhead assembly 230, the leveling device 250 being configured to sense a preset point location to generate a leveling signal.

As shown in fig. 16, 17, 18, 19 and 20, the guide assembly 220 includes a guide wheel 221, the guide wheel 221 includes a pulley outer ring 222, a first bearing 223, a second bearing 224 and a gasket 225, a mounting hole 2221 is formed in the pulley outer ring 222, a limiting projection 2222 is formed on a hole wall of the mounting hole 2221, the first bearing 223 and the second bearing 224 are both located in the mounting hole 2221, the first bearing 223 and the second bearing 224 are abutted to the limiting projection 2222 and are located at two sides of the limiting projection 2222, and the gasket 225 is located between the first bearing 223 and the second bearing 224; the limit projection 2222 can prevent circumferential play of the first bearing 223 and the second bearing 224, and mutual friction between the first bearing 223 and the second bearing 224.

The inner diameter of the washer 225 is greater than or equal to the diameter of the inner ring center circular hole of the first bearing 223, and the outer diameter of the washer 225 is smaller than the inner diameter of the limit projection 2222; wherein, the inner diameter of the gasket 225 is shown as D1 in fig. 20, the outer diameter of the gasket 225 is shown as D1 in fig. 20, and the inner diameter of the limit projection 2222 is shown as D2 in fig. 17.

The inner diameter of the limit projection 2222 is larger than the diameter of the inner ring of the first bearing 223, wherein the inner ring diameter of the first bearing 223 is shown as d3 in fig. 18.

As shown in fig. 17, the inner wall of the mounting hole 2221 is further provided with a first groove 2223 corresponding to the position of the first bearing 223, and the inner wall of the mounting hole 2221 is further provided with a second groove 2224 corresponding to the position of the second bearing 224;

the pulley outer ring 222 is a polyketone pulley outer ring.

The polyketone pulley outer ring, namely the pulley outer ring 222, is made of polyketone, namely a pok material, and is engineering plastic.

Specifically, taking the stereoscopic forming apparatus 200 provided in the embodiment of the present utility model as an example, the leveling operation of the stereoscopic forming apparatus 200 is explained as follows:

first, the detection position of the touch sensing device 100 is adjusted.

First, the adjusting member 134 of the touch sensing device 100 is operated to make the relative positions of the key cap 132 and the key shaft 131 of the pressing assembly 130 be in a relaxed state, so that the upper surface of the heat insulating member 137 on the key cap 132 protrudes out of the base 110 and protrudes out of the molding platform 240, as shown in fig. 12 and 13, and at this time, the key shaft 131 is in contact with the detecting member 121.

Secondly, the leveling fitting 260 is used to limit the preset point on the forming platform 240 and the upper surface of the heat insulation member 137 on the key cap 132 to be in the same plane, for example, the leveling fitting 260 is a plane plate, as shown in fig. 14 and 15, the heat insulation member 137 of the key cap 132 is pressed by the plane plate, so that the upper surface of the heat insulation member 137 is in the same plane as the preset point on the forming platform 240, at this time, the pressing assembly 130 is in the first position, and the relative positions of the key cap 132 and the key shaft 131 are fixed by the adjusting member 134, so that the pressing assembly 130 is maintained in the first position.

Next, the distance between the nozzle 231 and the molding stage 240 is calculated:

first, controlling the printhead assembly 230 to heat, heating the nozzle 231, and extruding excess material in the nozzle 231;

secondly, detecting the height of the preset point position of the forming platform 240 by using the leveling device 250 of the three-dimensional forming equipment 200, namely Z1, wherein the Z1 can represent the height of the leveling device 250 at the preset point position, and the preset point position and the upper surface of the heat insulation piece 137 of the pressing component 130 of the touch sensing device 100 are positioned in the same plane;

third, the guide assembly 220 is used to move the nozzle 231, so that the nozzle 231 interferes with the wiping assembly 150, the residual material of the nozzle 231 is erased, the nozzle 231 is cleaned, and the temperature of the nozzle 231 is reduced to a preset temperature, so that the residual material is prevented from dropping continuously.

Fourth, the nozzle 231 is used to press the heat insulating member 137 of the pressing assembly 130, such that the tip of the nozzle 231 touches the center of the upper surface of the heat insulating member 137, the piezoelectric member 122 of the touch sensing device 100 sends a detection signal, and the control device of the stereoscopic forming apparatus 200 records the height of the nozzle 231 at this time according to the detection signal, i.e. Z2.

Fifth, the leveling device 250 is used to detect a plurality of preset points of the forming platform 240, and a fitting curved surface is formed.

Sixth, leveling is completed and the nozzle 231 to forming table 240 position offset h=z1-z2+a+b+c is calculated; wherein a is the trigger depth of the touch sensing device 100, i.e. the distance from the upper surface of the heat insulating member of the pressing assembly 130 to the movement of the piezoelectric member 122 transmitting the detection signal from the same plane as the preset point; b is an error in the inclination angle of the upper surface mounting of the molding stage 240; c is a numerical value which can be manually operated by a reserved man-machine interaction interface, and is manually repaired when the machine calculation has a small deviation.

Therefore, when the three-dimensional forming equipment 200 prints, according to the fitting curved surface obtained by leveling, the printing head is moved by a distance consistent with the offset, and the printing head is moved according to the outline of the fitting curved surface, so that the nozzle 231 and the forming platform 240 can be kept to move at a uniform distance, namely, the upper surface of the nozzle 231 and the forming platform 240 can be kept at a relatively fixed height all the time, the first layer of the printed model and the upper surface of the forming platform 240 can be uniformly adhered, the high adhesion force is achieved, the problem that printing distortion is caused by poor stability and inclination in the printing process of the model is reduced, and the printing reliability and accuracy are improved.

As shown in fig. 1 to 15, in a specific example, the present utility model provides a touch sensing device 100 for auto leveling of a stereolithography apparatus 200, the touch sensing device 100 comprising: a base 110; the detection assembly 120, the detection assembly 120 includes a detection member 121 and a piezoelectric member 122 connected, the detection member 121 is connected with the base 110; the pressing assembly 130 is movably connected with the base 110, so that the pressing assembly 130 can partially protrude out of the base 110, and the pressing assembly 130 moves relative to the base 110 at least including a first position where the pressing assembly 130 protrudes out of the base 110 and contacts with the detecting piece 121; wherein the pressing assembly 130 is configured to be deformed by external pushing force to push the detecting member 121 when in the first position, so that the piezoelectric member 122 transmits the detection signal.

Further, the detecting member 121 is provided as an elastic member; the piezoelectric element 122 is configured to change an electrical state by deformation of the detecting element 121; the piezoelectric member 122 includes a piezoelectric ceramic plate 123 and a conductive material member 124, where the conductive material member 124 is disposed in a ring structure and wraps the periphery of the piezoelectric ceramic plate 123, and the piezoelectric member 122 further includes an insulating member, and the piezoelectric ceramic plate 123 and the conductive material member 124 are connected to the detecting member 121 through the insulating member.

Further, the pressing assembly 130 includes: the key shaft 131, the key cap 132, the first elastic reset member 133 and the adjusting member 134, the key cap 132 is sleeved on the outer side of the key shaft 131 and can move relative to the key shaft 131, the first elastic reset member 133 is located between the key shaft 131 and the key cap 132 to apply a force to the key shaft 131 and the key cap 132 far away from each other, and the adjusting member 134 is used for being connected with the key shaft 131 and the key cap 132 to fix or loosen the relative positions of the key cap 132 and the key shaft 131.

Further, the key shaft 131 is provided with a positioning hole 135, the key cap 132 is provided with an adjusting hole 136, and the adjusting piece 134 passes through the adjusting hole 136 to be connected with the positioning hole 135; the adjusting hole 136 is a long hole, and an outer wall of the key shaft 131 at least at the position where the positioning hole 135 is located is of a planar structure, and an outer wall of the key cap 132 at least at the position where the adjusting hole 136 is located is of a planar structure.

Further, the base 110 is provided with a first sliding hole 111, at least part of the detecting member 121 is exposed to the bottom opening of the first sliding hole 111 or extends into the first sliding hole 111, the hole wall of the first sliding hole 111 is provided with a first boss 1111, the key cap 132 and the detecting member 121 are positioned at two sides of the key shaft 131, part of the key shaft 131 is limited between the first boss 1111 and the detecting member 121 and can move along the first sliding hole 111, a first elastic reset member 133 is connected between the key cap 132 and the key shaft 131 to enable the key cap 132 to move to extend out of the top opening of the first sliding hole 111, and the key shaft 131 is in abutting connection or fixed connection with the detecting member 121;

The base 110 is provided with a relief hole 112 communicating with the first slide hole 111, the relief hole 112 being used for relieving a tool for adjusting the adjustment member 134.

Further, the key shaft 131 includes a base 1311 and a support shaft 1312, where the base 1311 is opposite to the detecting member 121 to connect the detecting member 121 or is used to abut against the detecting member 121, the key cap 132 is sleeved outside the support shaft 1312 from the bottom, and the first elastic reset member 133 is connected between the support shaft 1312 and the key cap 132; the bottom peripheral side of the key cap 132 is provided with an extension portion 1322 opposite to the seat 1311, and the extension portion 1322 is configured to abut against the first boss 1111 to limit movement of the key cap 132 and the key shaft 131 relative to the first sliding hole 111.

Further, the bottom of the base 110 is provided with a mounting groove 114 with a groove bottom communicated with the first sliding hole 111, the detecting piece 121 is mounted at the groove bottom of the mounting groove 114, and the piezoelectric piece 122 is positioned at one side of the detecting piece 121 far away from the pressing component 130; the touch sensing device 100 further includes an electric control board 140 electrically connected to the piezoelectric member 122, the electric control board 140 is connected to the opening of the mounting slot 114, and the electric control board 140 is used for amplifying the detection signal.

Further, the pressing assembly 130 further includes: a heat insulator 137 disposed at the top end of the key cap 132; wherein, the heat insulation member 137 comprises a heat insulation block 1371 and a plug 1372 which are connected, and the top end of the key cap 132 is provided with a jack 1321 for accommodating the plug 1372; the base 110 is used for being connected with the molding platform 240 of the stereo molding apparatus 200, and the end of the pressing component 130 of the touch sensing device 100 is located in the same plane with a preset point on the upper surface of the molding platform 240.

Further, the touch sensing device 100 further includes: and a wiper member 150 coupled to the base 110, the wiper member 150 being configured to interfere with the nozzle 231 of the stereolithography apparatus 200 to clean the nozzle 231.

Further, the base 110 is provided with a second sliding hole 113, the wiping component 150 comprises a buffer mechanism 152 and a wiping head 151, the buffer mechanism 152 is positioned in the second sliding hole 113, and the wiping head 151 is connected with the buffer mechanism 152 and can extend out of the second sliding hole 113; wherein the wiping head 151 comprises a silicone piece.

Further, the buffer mechanism 152 includes an upper cover 153, a supporting seat 154, and a second elastic restoring member 155, the wiping head 151 is connected with the upper cover 153, the supporting seat 154 is connected with the base 110, the upper cover 153 and the supporting seat 154 are connected through the second elastic restoring member 155, and the second elastic restoring member 155 is used for applying a force to the upper cover 153 away from the supporting seat 154; wherein, a guiding protrusion 156 is provided on one of the inner walls of the upper cover 153 and the second sliding hole 113, and a guiding groove is provided on the other, and the guiding protrusion 156 and the guiding groove are adapted to limit the movement of the upper cover 153 relative to the second sliding hole 113.

Further, a clamping groove 157 is formed in the circumferential side of the supporting seat 154, a buckle 115 is arranged on the outer wall of the base 110, and the supporting seat 154 is detachably buckled at the bottom of the base 110 through the buckle 115 and the clamping groove 157.

Further, a through hole 1541 is formed in the middle of the supporting seat 154, the upper cover 153 includes a supporting column 1531 and a bearing portion 1532 connected to each other, the bearing portion 1532 is connected to the wiping head 151, the supporting column 1531 is movably inserted into the through hole 1541, and the second elastic restoring member 155 is sleeved on a peripheral side of the supporting column 1531 and located between the bearing portion 1532 and the supporting seat 154;

the wall of the second sliding hole 113 is provided with a second boss 1131, and the bottom peripheral side of the wiping head 151 is provided with a convex portion 1511, and the second boss 1131 abuts against the convex portion 1511 to limit the movement of the wiping head 151 relative to the second sliding hole 113.

The present utility model also provides a stereolithography apparatus 200 comprising: the molding platform 240, and the touch sensing device 100 according to any one of the first aspect, wherein an end of the pressing component 130 of the touch sensing device 100 is located in the same plane as a predetermined point on the upper surface of the molding platform 240.

Further, the stereolithography apparatus 200 further includes: a base 210, a guide assembly 220, a printhead assembly 230, and a leveling device 250, the printhead assembly 230 including a nozzle 231; the printhead assembly 230 and the modeling platform 240 are coupled to the base 210 via the guide assembly 220, respectively; the touch sensing device 100 is connected with the molding platform 240, and the nozzle 231 is used for pushing the pressing assembly 130; the leveling device 250 is connected with the printhead assembly 230, and the leveling device 250 is used for sensing a preset point position to generate a leveling signal;

The guide assembly 220 comprises a guide wheel 221, the guide wheel 221 comprises a pulley outer ring 222, a first bearing 223, a second bearing 224 and a gasket 225, a mounting hole 2221 is formed in the pulley outer ring 222, a limiting projection 2222 is arranged on the hole wall of the mounting hole 2221, the first bearing 223 and the second bearing 224 are both positioned in the mounting hole 2221, the first bearing 223 and the second bearing 224 are in butt joint with the limiting projection 2222 and are respectively positioned on two sides of the limiting projection 2222, and the gasket 225 is positioned between the first bearing 223 and the second bearing 224;

the inner diameter of the washer 225 is greater than or equal to the diameter of the inner ring center circular hole of the first bearing 223, and the outer diameter of the washer 225 is smaller than the inner diameter of the limit projection 2222;

the inner diameter of the limit projection 2222 is larger than the diameter of the inner ring of the first bearing 223;

the inner wall of the mounting hole 2221 is also provided with a first groove 2223 corresponding to the position of the first bearing 223, and the inner wall of the mounting hole 2221 is also provided with a second groove 2224 corresponding to the position of the second bearing 224;

the pulley outer ring 222 is a polyketone pulley outer ring 222.

In the description of the present utility model, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are orientation or positional relationship based on the drawings, merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A touch sensing device for auto leveling of a stereolithography apparatus, the touch sensing device comprising:

a base;

the detection assembly comprises a detection piece and a piezoelectric piece which are connected, and the detection piece is connected with the base body;

the pressing component is movably connected with the base body so that the pressing component can partially protrude out of the base body, and the pressing component moves relative to the base body at least comprises a first position where the pressing component protrudes out of the base body and is in contact with the detection piece;

the pressing component is configured to be pushed by external pushing force to deform the detection piece when being in the first position, so that the piezoelectric piece sends a detection signal.

2. The touch sensing device of claim 1, wherein,

the detection piece is arranged as an elastic piece;

the piezoelectric piece is configured to change an electrical state due to deformation of the detection piece;

The piezoelectric element comprises a piezoelectric ceramic piece and a conductive material piece, wherein the conductive material piece is arranged in an annular structure and wrapped on the periphery of the piezoelectric ceramic piece, the piezoelectric element further comprises an insulating piece, and the piezoelectric ceramic piece and the conductive material piece are connected to the detecting piece through the insulating piece.

3. The touch sensing device of claim 1, wherein the pressing assembly comprises:

the key shaft, the key cap, first elasticity reset piece and regulating part, the key cap cover is established the outside of key shaft and can be relative the key shaft removes, first elasticity reset piece is located the key shaft with between the key cap, in order to the key shaft with the effort that keeps away from each other is exerted to the key cap, the regulating part be used for with the key shaft with the key cap is connected, in order to fix or become flexible the relative position of key cap with the key shaft.

4. The touch sensing device of claim 3, wherein,

the key shaft is provided with a positioning hole, the key cap is provided with an adjusting hole, and the adjusting piece penetrates through the adjusting hole to be connected with the positioning hole;

The adjusting hole is a strip hole, the outer wall of the key shaft at least at the position where the positioning hole is located is of a plane structure, and the outer wall of the key cap at least at the position where the adjusting hole is located is of a plane structure.

5. The touch sensing device of claim 3, wherein,

the base body is provided with a first sliding hole, at least part of the detection piece is exposed to the bottom opening of the first sliding hole or extends into the first sliding hole, the hole wall of the first sliding hole is provided with a first boss, the key cap and the detection piece are positioned on two sides of the key shaft, part of the key shaft is limited between the first boss and the detection piece and can move along the first sliding hole, and the first elastic reset piece is connected between the key cap and the key shaft so that the key cap moves to extend out of the top opening of the first sliding hole, and the key shaft is in butt joint or fixed connection with the detection piece;

6. The touch sensing device of claim 5, wherein,

The key shaft comprises a base body and a supporting shaft, the base body is opposite to the detection piece so as to be connected with the detection piece or used for being abutted to the detection piece, the key cap is sleeved on the outer side of the supporting shaft through the bottom, and the first elastic reset piece is connected between the supporting shaft and the key cap;

the bottom circumference side of the key cap is provided with an extension part opposite to the base body, and the extension part is used for abutting against the first boss to limit the movement of the key cap and the key shaft relative to the first sliding hole.

7. The touch sensing device of claim 5, wherein,

the bottom of the base body is provided with a mounting groove with the groove bottom communicated with the first sliding hole, the detection piece is mounted at the groove bottom of the mounting groove, and the piezoelectric piece is positioned at one side of the detection piece far away from the pressing component;

the touch sensing device further comprises an electric control plate electrically connected with the piezoelectric piece, the electric control plate is connected to the opening of the mounting groove, and the electric control plate is used for amplifying the detection signal;

the pressing assembly further includes:

the heat insulation piece is arranged at the top end of the key cap;

The heat insulation piece comprises a heat insulation block and a plug which are connected, and the top end of the key cap is provided with a jack for accommodating the plug;

the base body is used for being connected with a forming platform of the three-dimensional forming equipment, and the end part of the pressing component of the touch sensing device is positioned in the same plane with a preset point position on the upper surface of the forming platform.

8. The touch sensing device of claim 1, further comprising:

and the wiping component is connected with the base body and is used for interfering with the nozzle of the three-dimensional forming equipment to clean the nozzle.

9. The touch sensing device of claim 8, wherein,

the base body is provided with a second sliding hole, the wiping component comprises a buffer mechanism and a wiping head, the buffer mechanism is positioned in the second sliding hole, and the wiping head is connected with the buffer mechanism and can extend out of the second sliding hole;

wherein the wiping head comprises a silica gel piece;

the buffer mechanism comprises an upper cover, a supporting seat and a second elastic resetting piece, the wiping head is connected with the upper cover, the supporting seat is connected with the base body, the upper cover is connected with the supporting seat through the second elastic resetting piece, and the second elastic resetting piece is used for applying acting force far away from the supporting seat to the upper cover;

One of the inner walls of the upper cover and the second sliding hole is provided with a guide protrusion, the other one of the inner walls of the upper cover and the second sliding hole is provided with a guide groove, and the guide protrusion and the guide groove are matched with each other to limit the movement of the upper cover relative to the second sliding hole;

the periphery of the supporting seat is provided with a clamping groove, the outer wall of the base body is provided with a buckle, and the supporting seat is detachably buckled at the bottom of the base body through the buckle and the clamping groove;

the middle part of the supporting seat is provided with a through hole, the upper cover comprises a supporting column and a bearing part which are connected, the bearing part is connected with the wiping head, the supporting column is movably inserted into the through hole, and the second elastic resetting piece is sleeved on the periphery of the supporting column and is positioned between the bearing part and the supporting seat;

the pore wall of the second sliding hole is provided with a second boss, the periphery side of the bottom of the wiping head is provided with a convex part, and the second boss is abutted to the convex part so as to limit the movement of the wiping head relative to the second sliding hole.

10. A stereolithography apparatus, comprising: a profiled platform and a touch sensing device as claimed in any one of claims 1 to 9, the end of the pressing component of the touch sensing device being in the same plane as a predetermined point on the upper surface of the profiled platform.

11. The stereolithography apparatus according to claim 10, further comprising: the device comprises a base, a guide assembly, a printing head assembly and a leveling device, wherein the printing head assembly comprises a nozzle;

the printing head assembly and the forming platform are respectively connected with the base through the guide assembly;

the touch sensing device is connected with the forming platform, and the nozzle is used for pushing the pressing component;

the leveling device is connected with the printing head assembly and is used for sensing the preset point position to generate a leveling signal;

the inner diameter of the gasket is larger than or equal to the diameter of the central round hole of the inner ring of the first bearing, and the outer diameter of the gasket is smaller than the inner diameter of the limiting protrusion;

the pulley outer ring is a polyketone pulley outer ring.