A detection circuit, detection device, and printing system

Abstract

The application discloses a detection circuit, a detection device and a printing system, which mainly generates a feedback signal when printing resin is insufficient, so that resin supplement is realized in time. The main technical scheme of the application is as follows: a detection circuit, wherein a first resistor of a detection circuit is connected with a high level, the first resistor is connected with a second resistor, the second resistor is connected with a third resistor, and the third resistor is grounded; a first end of the second resistor is electrically connected with a first probe, a second end of the second resistor is electrically connected with a second probe, the first probe and the second probe are respectively used for connecting printing resin, the second resistor and a reference voltage generating circuit are respectively connected with a comparator; when the printing resin is in a first state, the first probe and the second probe are disconnected, a detection voltage of the second end of the second resistor is less than the reference voltage, and the comparator outputs a first feedback control signal to control an automatic feeding module of a three-dimensional printer to close an automatic feeding function. The application is mainly used for printing resin detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, and in particular to a detection circuit, a detection device and a printing system. BACKGROUND

[0002] A 3D printer is a kind of machine of a cumulative manufacturing technology, i.e. a kind of machine of a rapid prototyping technology. In a common light-curing 3D printer, a tank containing resin is placed on a light source of the printer, and the resin in the tank is solidified layer by layer to realize 3D printing. During the printing process, the resin in the tank is continuously reduced, and the automatic replenishment of the resin can be realized by cooperating a liquid level detection component with a resin bottle. The liquid level detection component detects the liquid level of the resin in the tank, and when the liquid level is lower than a threshold, the resin bottle containing the resin is inflated to extrude the resin in the bottle into the tank to realize automatic replenishment, so that there is enough resin in the tank for continuous printing.

[0003] Among them, the amount of resin in the resin bottle is limited, and when the resin in the resin bottle is not replenished in time when it is insufficient, it will cause printing failure due to material breakage, and the discharge pipe of the resin bottle will continuously blow out due to the inflation effect, which will cause the resin in the tank to be unstable and affect the printing effect. SUMMARY

[0004] Therefore, in order to solve the above technical problems, the present application provides a detection circuit, a detection device and a printing system, which mainly generate a feedback control signal to close the automatic feeding function of the three-dimensional printer when the printing resin is insufficient, so as to replenish the resin in time.

[0005] In one aspect, the present application provides a detection circuit for detecting three-dimensional printing resin, comprising:

[0006] a detection circuit, a reference voltage generation circuit and a comparator;

[0007] The detection circuit comprises a first probe, a second probe, a first resistor, a second resistor and a third resistor;

[0008] The first end of the first resistor is connected to a high level, the second end of the first resistor is electrically connected to the first end of the second resistor, the second end of the second resistor is electrically connected to the first end of the third resistor, and the second end of the third resistor is grounded;

[0009] The first end of the second resistor is also electrically connected to the first probe, and the second end of the second resistor is also electrically connected to the second probe, and the first probe and the second probe are respectively used for connecting the printing resin;

[0010] The second end of the second resistor and the output end of the reference voltage generation circuit are respectively electrically connected to the input end of the comparator;

[0011] The reference voltage generation circuit is used to output a reference voltage, when the printing resin is in a first state, the first probe and the second probe are disconnected, the detection voltage of the second end of the second resistor is less than the reference voltage, and the comparator is used to output a first feedback control signal when the detection voltage is less than the reference voltage, so as to control the automatic feeding module of the three-dimensional printer to close the automatic feeding function.

[0012] Further comprising: an indication circuit, the indication circuit comprising a switch circuit and an alarm circuit;

[0013] The output end of the comparator is electrically connected with the input end of the switch circuit, and the output end of the switch circuit is electrically connected with the input end of the alarm circuit;

[0014] The switch circuit is used to output a trigger signal to the alarm circuit when receiving the first feedback control signal, and the alarm circuit is used to output alarm information when receiving the trigger signal.

[0015] The switch circuit comprises a first transistor;

[0016] The alarm circuit comprises a light-emitting transistor;

[0017] The output end of the comparator is electrically connected with the first end of the first transistor, the second end of the first transistor is connected with a high level and the first end of the light-emitting transistor, the third end of the first transistor is grounded, and the second end of the light-emitting transistor is connected with a high level;

[0018] The alarm information comprises a light signal generated by the light-emitting transistor.

[0019] The reference voltage generation circuit comprises a voltage dividing resistor and a variable resistor;

[0020] The first end of the voltage dividing resistor is connected with a high level, the second end of the voltage dividing resistor is connected with the first end of the variable resistor, and the second end of the variable resistor is grounded;

[0021] The second end of the voltage dividing resistor is electrically connected with the input end of the comparator, and the variable resistor is used to adjust the reference voltage by changing the resistance value.

[0022] Further comprising: a master control module, a human-computer interaction module and an automatic feeding module;

[0023] The input end of the master control module is electrically connected with the output end of the switch circuit, and the output end of the master control module is respectively electrically connected with the human-computer interaction module and the automatic feeding module;

[0024] The master control module is used to control the human-computer interaction module 6 to output feedback information when receiving the trigger signal output by the switch circuit, and control the automatic feeding module to close the automatic feeding function;

[0025] The feedback information comprises alarm information and image information.

[0026] The detection circuit further comprises: when the printing resin changes from the first state to the second state, the first probe and the second probe are electrically connected, the detection voltage of the second end of the second resistor is greater than the reference voltage, and the comparator is configured to output a second feedback control signal when the detection voltage is greater than the reference voltage, so as to switch the automatic feeding function of the automatic feeding module from the closed state to the open state.

[0027] In another aspect, the embodiments of the present application also provide a detection device comprising the detection circuit according to any one of the above, and a container, an end cover, a first detection rod and a second detection rod.

[0028] The container and the end cover enclose a containing cavity, the containing cavity is used for containing the printing resin, the first end of the first detection rod and the first end of the second detection rod are respectively connected to the end cover, the first detection rod and the second detection rod extend in the containing cavity along the direction in which the liquid surface of the printing resin rises and falls, the second end of the first detection rod and the second end of the second detection rod are opposite to the bottom wall of the container, and the second end of the first detection rod and the second end of the second detection rod are used for detecting the printing resin.

[0029] The end cover is detachably connected to the container, and the first detection rod and the second detection rod are both conductors.

[0030] The first end of the first detection rod and the first end of the second detection rod are respectively provided with interface ends at the end cover, and the two interface ends are respectively used for being electrically connected to the first probe and the second probe through a data line.

[0031] The first probe of the detection circuit detects the printing resin through the second end of the first detection rod, the second probe of the detection circuit detects the printing resin through the second end of the second detection rod, and the first probe and the second probe are electrically connected when the first detection rod and the second detection rod both detect the printing resin.

[0032] When the first detection rod and / or the second detection rod do not detect the printing resin, the first probe and the second probe are not electrically connected, and the comparator outputs a first feedback control signal to control the automatic feeding module of the three-dimensional printer to close the automatic feeding function.

[0033] In another aspect, the embodiments of the present application also provide a printing system comprising the detection device according to any one of the above and a three-dimensional printer.

[0034] The embodiment of the present application provides a detection circuit, a detection device and a printing system, which mainly generate a feedback signal when printing resin in a resin bottle is insufficient, so that timely warning is realized to supplement resin. In the prior art, when resin in the resin bottle is less and is not supplemented in time, the automatic feeding function of the three-dimensional printer is still working, and resin in the resin bottle is sent to a material groove of the printer. Since the resin bottle is empty or has little resin, the material outlet pipe of the resin bottle continuously blows air outward, so that a large amount of air instead of resin is sent into the material groove, resin in the material groove is unstable, and the printing effect is affected. Compared with the prior art, in the present application, a detection circuit is connected with printing resin, the detection circuit outputs a detection voltage when a residual amount of the printing resin is in a first state, a comparator compares the received detection voltage with a reference voltage, a control signal is output according to a comparison result, the automatic feeding function of the three-dimensional printer is closed, and the printing resin is supplemented in time. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A circuit principle diagram of the detection circuit provided by the embodiment of the present application;

[0036] Figure 2 A structure schematic diagram of the detection device provided by the embodiment of the present application when printing resin is in a first state;

[0037] Figure 3 A structure schematic diagram of the detection device provided by the embodiment of the present application when printing resin is in a second state;

[0038] Figure 4 A structure schematic diagram of the detection device and the automatic feeding module provided by the embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to further illustrate the technical means and effects taken by the present application to achieve the predetermined purposes, the specific implementation, structure, features and effects of the detection circuit according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0040] As shown in Figure 1 The embodiment of the present application provides a detection circuit, which is used for detection of three-dimensional printing resin and includes the following.

[0041] The detection circuit 1, the reference voltage generation circuit 2 and the comparator 3;

[0042] The detection circuit 1 includes the first probe 01, the second probe 02, the first resistor R1, the second resistor R2 and the third resistor R3;

[0043] The first end of the first resistor R1 is connected to a high level, the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, the second end of the second resistor R2 is electrically connected to the first end of the third resistor R3, and the second end of the third resistor R3 is grounded;

[0044] The first end of the second resistor R2 is also electrically connected to the first probe 01, and the second end of the second resistor R2 is also electrically connected to the second probe 02, and the first probe 01 and the second probe 02 are respectively used to connect the printing resin;

[0045] The second end of the second resistor R2 and the output end of the reference voltage generating circuit 2 are respectively electrically connected to the input end of the comparator 3;

[0046] The reference voltage generating circuit 2 is used to output a reference voltage, when the printing resin is in a first state, the first probe 01 and the second probe 02 are disconnected, the detection voltage of the second end of the second resistor R2 is less than the reference voltage, and the comparator 3 is used to output a first feedback control signal when the detection voltage is less than the reference voltage, so as to control the automatic feeding module 7 of the three-dimensional printer to close the automatic feeding function.

[0047] Wherein, the detection circuit 1 is used to feed back the detection voltage according to the remaining amount of the printing resin, the detection circuit 1 can include a detection member such as a probe which can be inserted into the printing resin, the detection member sends different feedback signals when it contacts the printing resin or does not contact the printing resin, or the detection circuit 1 can also include a liquid level detector which feeds back different signals according to the liquid level of the printing resin, or the detection circuit 1 can also include a mechanical detection device such as a float, when the height of the float drops to a certain height along with the upper surface of the printing resin, a switch is triggered, and then a feedback signal is sent. The detection circuit 1 can have various forms, and the purpose is to generate different sizes of detection voltage when the remaining amount of the printing resin, i.e. the liquid level of the printing resin, is above or below the threshold value. The reference voltage generating circuit 2 generates a reference voltage for judging the size of the detection voltage, and the reference voltage is a fixed value. The comparator 3 can be a comparison amplifier, which is used to compare the size of the detection voltage and the reference voltage, and generate different amplification signals.

[0048] In one embodiment, the three-dimensional printer has an automatic feeding function, which is realized by the automatic feeding module 7, and the automatic feeding module 7 is used to turn on and off the automatic feeding function of the three-dimensional printer according to the output signal of the comparator 3. Specifically, the detection circuit 1 includes a first probe 01 and a second probe 02, both of which are metal probes. When the printing resin is in the first state, i.e., the remaining amount of the printing resin is less than the threshold value, the first probe 01 and the second probe 02 are disconnected, the detection voltage at the second end of the second resistor R2 is less than the reference voltage, the comparator 3 outputs a first feedback control signal, and the automatic feeding module 7 turns off the automatic feeding function of the three-dimensional printer. When the printing resin changes from the first state to the second state, i.e., the remaining amount of the printing resin is greater than the threshold value, the first probe 01 and the second probe 02 are connected, the detection voltage at the second end of the second resistor R2 is greater than the reference voltage, the comparator 3 outputs a second feedback control signal, and the automatic feeding module 7 switches the automatic feeding function from the off state to the on state.

[0049] Furthermore, when the first probe 01 and the second probe 02 are connected through the printing resin, it is equivalent to connecting a resistor formed by the printing resin between the first probe 01 and the second probe 02. However, the conductive ability of different printing resins is different, and when determining the specific values of the resistances in the detection circuit 1, the resistance values in the detection circuit 1 need to be adjusted according to the conductive ability of different printing resins, so that the detection circuit 1 can output a detection voltage greater than the reference voltage and a detection voltage less than the reference voltage when detecting a plurality of different printing resins. In this embodiment, the first resistor R1, the second resistor R2, and the third resistor R3 are connected in series, and the first probe 01 and the second probe 02 are connected to the two ends of the second resistor R2. This technical solution can realize the convenience of the determination process of the resistance values. Specifically, when the first probe 01 and the second probe 02 are connected, it is equivalent to connecting a resin resistor in parallel with the second resistor R2, thereby changing the voltage division at the two ends of the second resistor R2 and changing the size of the voltage output at the second end of the second resistor R2. That is, the factors that change the voltage output at the second end of the second resistor R2 are mainly concentrated on the selection of the resistance value of the second resistor R2. The detection circuit 1 can realize the detection function for a plurality of different printing resins, and only needs to adjust the resistance value of the second resistor R2.

[0050] The size of the reference voltage can be set according to the specific form of the detection circuit 1, and is intended to provide a basis for judging the size of the detection voltage. When the detection circuit is used for detecting a plurality of printing materials in a larger range, the reference voltage generation circuit 2 can be set to have an adjustable reference voltage size, and the specific implementation will be described in detail below.

[0051] The detection circuit, the detection device and the printing system provided by the embodiment of the present application mainly generate a feedback signal when the resin in the resin bottle is insufficient for printing, so that timely warning can be realized to supplement the resin. In the prior art, when the resin in the resin bottle is insufficient and is not supplemented in time, the automatic feeding function of the three-dimensional printer is still working, and the resin in the resin bottle is sent to the material tank of the printer. Since the resin bottle has no resin or has very little resin, the discharge pipe of the resin bottle will continuously blow air outward. In this way, a large amount of air instead of resin is sent to the material tank, so that the resin in the material tank is unstable, and the printing effect is affected. Compared with the prior art, in the present application, the detection circuit is connected to the printing resin. When the remaining amount of the printing resin is in the first state, the detection circuit outputs a detection voltage. The comparator compares the received detection voltage with a reference voltage, and outputs a control signal according to the comparison result, so as to realize the closing of the automatic feeding function of the three-dimensional printer and the timely supplement of the printing resin.

[0052] Further, the detection circuit further comprises an indication circuit 4. The indication circuit 4 comprises a switching circuit and an alarm circuit. The output end of the comparator 3 is electrically connected with the input end of the switching circuit, and the output end of the switching circuit is electrically connected with the input end of the alarm circuit. The switching circuit is used for outputting a trigger signal to the alarm circuit when the first feedback control signal is received. The alarm circuit is used for outputting alarm information when the trigger signal is received.

[0053] The method for monitoring the signal at the output end of the comparator 3 can be that the signal is received and displayed by a control chip or a computer, or the signal is prompted by a light-emitting diode and an audible and light alarm. The present embodiment provides a simple light-emitting prompt circuit. The switching circuit comprises a first transistor Q1, and the alarm circuit comprises a light-emitting transistor D1. The output end of the comparator 3 is electrically connected with the first end of the first transistor Q1. The second end of the first transistor Q1 is connected with a high level and the first end of the light-emitting transistor D1. The third end of the first transistor Q1 is grounded. The second end of the light-emitting transistor D1 is connected with a high level. The alarm information comprises a light signal generated by the light-emitting transistor D1.

[0054] In an embodiment, the light-emitting transistor D1 is a light-emitting diode, and the first transistor Q1 is a PNP type crystal triode. The emitter E of the crystal triode is connected with a high level through a pull-up resistor. The collector C is grounded. The base B, that is, the control end, is connected with the output end of the comparator 3. The emitter E is also connected with the cathode of the light-emitting diode. The anode of the emitter E is connected with a high level through a pull-up resistor. The specific working principle is as follows: when the first probe 01 and the second probe 02 are connected, the comparator 3 outputs a high level, the first transistor Q1 is not conductive, and the light-emitting diode does not emit light. When the first probe 01 and the second probe 02 are disconnected, the comparator 3 outputs a low level, the first transistor Q1 is conductive, and the light-emitting diode is conductive and emits light.

[0055] In one embodiment, the reference voltage generating circuit 2 comprises a voltage dividing resistor R4 and a variable resistor R5. The first end of the voltage dividing resistor R4 is connected to a high level, the second end of the voltage dividing resistor R4 is connected to the first end of the variable resistor R5, and the second end of the variable resistor R5 is grounded. The second end of the voltage dividing resistor R4 is electrically connected to the input end of the comparator 3, and the variable resistor R5 is used to adjust the reference voltage by changing the resistance value.

[0056] The variable resistor R5 can be a slide rheostat. The second end of the voltage dividing resistor R4 is connected to the first end of the slide rheostat, the slide control end of the slide rheostat is connected to the first end of the slide rheostat, the second end of the slide rheostat is grounded, and the slide control end of the slide rheostat is slid. When the slide control end of the slide rheostat is slid, the resistance between the first end and the second end of the slide rheostat can be changed. By changing the resistance value of the slide rheostat, the voltage division of the slide rheostat can be changed, and the size of the reference voltage can be adjusted. Because the conduction resistance values of different printing materials are different, the voltage output by the detection circuit 1 when the probe is turned on or turned off can be less than the reference voltage. At this time, the reference voltage needs to be adjusted. The adjustment of the reference voltage is mainly to ensure that the turning on and turning off of the probe can trigger the jump of the output signal of the comparator 3. If the detection circuit is only used to detect one kind of printing material, such as only one kind of resin, the variable resistor R5 can be a fixed resistance resistor with an adjusted resistance value. The variable resistor R5 can also be other forms of variable resistor, such as temperature sensing resistor or light sensing resistor, etc.

[0057] Further, the detection circuit further comprises a main control module 5, a human-computer interaction module 6 and an automatic feeding module 7. The input end of the main control module 5 is electrically connected to the output end of the switching circuit, and the output end of the main control module 5 is electrically connected to the human-computer interaction module 6 and the automatic feeding module 7 respectively. The main control module 5 is used to control the human-computer interaction module 6 to output feedback information and control the automatic feeding module 7 to close the automatic feeding function when receiving the trigger signal output by the switching circuit. The feedback information includes alarm information and image information.

[0058] In one embodiment, the main control module 5 is an MCU chip. The MCU chip can be a chip dedicated to the detection circuit, or can be a mainboard inside the three-dimensional printer. The human-computer interaction module 6 can be a touch display screen of the three-dimensional printer or other sound and light alarm devices. For example, the human-computer interaction module 6 comprises a buzzer and a touch screen. The MCU chip is connected to the emitter E of the first transistor Q1. When the comparator 3 outputs a low level, the first transistor Q1 is turned on, so that the emitter E level is flipped from high level to low level. After receiving the level flip signal of the first transistor Q1, the MCU chip determines that the resin in the bottle is insufficient, displays image information to the user through the human-computer interaction module 6, and starts the buzzer for sound and light alarm.

[0059] On the other hand, if the detection circuit is used to detect the resin in the bottle, the main control module 5 can be a mainboard inside the three-dimensional printer, and the human-computer interaction module 6 can be a touch display screen of the three-dimensional printer or other sound and light alarm devices. Figures 2-3As shown, the embodiment of the present application also provides a detection device, which comprises the detection circuit according to any one of the above and the container 10, the end cover 20, the first detection rod 30 and the second detection rod 40. The container 10 and the end cover 20 enclose a containing cavity, the containing cavity is used for containing the printing resin, the first end of the first detection rod 30 and the first end of the second detection rod 40 are respectively connected to the end cover 20, the first detection rod 30 and the second detection rod 40 extend in the containing cavity along the direction of the printing resin liquid level rising, the second end of the first detection rod 30 and the second end of the second detection rod 40 are opposite to the bottom wall of the container 10, and the second end of the first detection rod 30 and the second end of the second detection rod 40 are used for detecting the printing resin. Wherein, the end cover 20 is detachably connected to the container 10, and the first detection rod 30 and the second detection rod 40 are both conductors.

[0060] The first detection rod 30 can be made of brass plated with nickel, and the second detection rod 40 can be made of aluminum pipe, so as to ensure the electrical conductivity. The container 10 is a material bottle. In use, the end cover 20 is connected to the top opening of the material bottle, the printing resin is settled below the container 10, the first detection rod 30 and the second detection rod 40 are connected to the end cover 20 and extend in the vertical direction, the bottom ends of the first detection rod 30 and the second detection rod 40 are close to the bottom of the bottle and are spaced apart from the bottom of the bottle by a certain gap, when the remaining amount of the printing resin is sufficient, as shown in FIG. 1, the first detection rod 30 and the second detection rod 40 are inserted into the printing resin, the first detection rod 30 and the second detection rod 40 are in conduction, when the remaining amount of the printing resin is insufficient, as shown in FIG. 2, the first detection rod 30 and the second detection rod 40 are separated from the printing resin, and the first detection rod 30 and the second detection rod 40 are disconnected. Figure 2 Figure 3

[0061] The end cover 20 is detachably connected to the container 10, specifically through threaded connection, so that the end cover 20 with the first detection rod 30 and the second detection rod 40 can be applied to various material bottles. When the printer has requirements for the shape of the material bottle, only the end cover 20 needs to be replaced to realize the detection of the printing resin.

[0062] The first end of the first detection rod and the first end of the second detection rod are respectively provided with interface ends at the end cover, and the two interface ends are respectively used for electrically connecting the first probe and the second probe through a data line. The first probe 01 of the detection circuit 1 detects the printing resin through the second end of the first detection rod 30, and the second probe 02 of the detection circuit 1 detects the printing resin through the second end of the second detection rod 40. When the first detection rod 30 and the second detection rod 40 both detect the printing resin, the first probe 01 and the second probe 02 are electrically connected.

[0063] ​​The first probe 01 and the second probe 02 are metal probes, the first detection rod 30 and the second detection rod 40 are metal detection rods, and the first ends of the first detection rod 30 and the second detection rod 40 are respectively provided with interface ends at the end cover 20, and the two interface ends are respectively used for being electrically connected with the first probe 01 and the second probe 02 through data lines. When the first detection rod 30, the second detection rod 40 and the printing resin are not electrically connected, the amplifier 3 outputs the first feedback control signal to control the automatic feeding module 7 of the three-dimensional printer to close the automatic feeding function.

[0064] The detection circuit is integrated on the main control board of the three-dimensional printer, and in use, the first detection rod 30 and the second detection rod 40 are respectively connected to the printer through data lines, so that the first detection rod 30 and the second detection rod 40 are respectively electrically connected with the first probe 01 and the second probe 02, and the connection relationship between the first detection rod 30, the second detection rod 40 and the printing resin is used for detecting the state of the printing resin, so that the main control board of the three-dimensional printer receives the detection signal, and then controls the opening and closing of the automatic feeding function of the automatic feeding module 7.

[0065] In the detection process, when the remaining amount of the printing resin is less than the threshold value, the first detection rod 30 and the second detection rod 40 are disconnected, so that the first probe 01 and the second probe 02 are disconnected, the first resistor R1, the second resistor R2 and the third resistor R3 form a series circuit, and the voltage at the second end of the second resistor R2 is less than the reference voltage due to the voltage division of the second resistor R2, so as to control the automatic feeding module 7 to close the automatic feeding function; when the remaining amount of the printing resin is greater than the threshold value, the first detection rod 30 and the second detection rod 40 are connected through the printing resin, so that the first probe 01 and the second probe 02 are connected, and a resistor formed by the printing resin is formed between the first probe 01 and the second probe 02, the resistor formed by the printing resin is connected in parallel with the second resistor R2, so that the voltage division of the second resistor R2 is reduced, the voltage output at the second end of the second resistor R2 is increased, the detection voltage at the second end of the second resistor R2 is greater than the reference voltage, the comparator 3 outputs the second feedback control signal, and then the automatic feeding function of the automatic feeding module 7 is opened.

[0066] It can be understood that the disconnection of the first detection rod 30 and the second detection rod 40 includes three cases: first, neither the first detection rod 30 nor the second detection rod 40 detects the printing resin; second, the first detection rod 30 detects the printing resin, but the second detection rod 40 does not detect the printing resin; third, the first detection rod 30 does not detect the printing resin, but the second detection rod 40 detects the printing resin. The above three cases will disconnect the first probe and the second probe to control the automatic feeding module of the three-dimensional printer to close the automatic feeding function. Only when the first detection rod 30 and the second detection rod 40 all detect the printing resin, the automatic feeding function is opened.

[0067] Furthermore, the automatic feeding module 7 turns the feeding function on and off through the automatic feeding device. The first detection rod 30 serves as both a probe for detecting the printing resin and an outlet for the printing resin. The first detection rod 30 has a hollow structure.

[0068] like Figure 4 As shown, the automatic feeding device includes an air port 201 on the end cap 20 and an air guide pipe 202 connected to the air port 201, as well as a vacuum pump 203. The vacuum pump 203 is connected to the automatic feeding module 7 and the air guide pipe 202 respectively. The automatic feeding module 7 is used to turn on the vacuum pump 203 when the first probe 01 and the second probe 02 are connected. The vacuum pump 203 fills the cavity with air through the air guide pipe 202 so that the printing resin is extruded through the central through hole of the first detection rod 30 to the printer material tank 60. The automatic feeding module 7 is used to turn off the vacuum pump 203 and stop extruding the printing resin when the first probe 01 and the second probe 02 are disconnected.

[0069] In another aspect, embodiments of the present invention also provide a printing system, including a detection device as described above and a printer. The printer includes the printer material tank 60, and a first detection rod 30 is connected to a discharge hose. The discharge hose corresponds to the printer material tank 60. After the printing resin is pressed out through the central through hole of the first detection rod 30, it is delivered to the printer material tank 60 through the discharge hose.

[0070] This invention provides a detection circuit for detecting resin used in 3D printing, comprising:

[0071] Detection circuit 1, reference voltage generation circuit 2, and comparator 3;

[0072] The detection circuit 1 includes a first probe 01, a second probe 02, a first resistor R1, a second resistor R2, and a third resistor R3;

[0073] The first terminal of the first resistor R1 is connected to a high level, the second terminal of the first resistor R1 is electrically connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is electrically connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is grounded.

[0074] The first end of the second resistor R2 is also electrically connected to the first probe 01, and the second end of the second resistor R2 is also electrically connected to the second probe 02. The first probe 01 and the second probe 02 are respectively used to connect to the printing resin.

[0075] The second end of the second resistor R2 and the output end of the reference voltage generation circuit 2 are electrically connected to the input end of the comparator 3, respectively.

[0076] The reference voltage generation circuit 2 is used to output a reference voltage, when the printing resin is in the first state, the first probe 01 and the second probe 02 are disconnected, the detection voltage of the second end of the second resistor R2 is less than the reference voltage, and the comparator 3 is used to output a first feedback control signal when the detection voltage is less than the reference voltage, so as to control the automatic feeding module of the three-dimensional printer to close the automatic feeding function.

[0077] The indication circuit 4 includes a switching circuit and an alarm circuit.

[0078] The output end of the comparator 3 is electrically connected with the input end of the switching circuit, and the output end of the switching circuit is electrically connected with the input end of the alarm circuit.

[0079] The switching circuit is used to output a trigger signal to the alarm circuit when receiving the first feedback control signal, and the alarm circuit is used to output alarm information when receiving the trigger signal.

[0080] The switching circuit includes a first transistor Q1.

[0081] The alarm circuit includes a light-emitting transistor D1.

[0082] The output end of the comparator 3 is electrically connected with the first end of the first transistor Q1, the second end of the first transistor Q1 is connected with a high level and the first end of the light-emitting transistor D1, the third end of the first transistor Q1 is grounded, and the second end of the light-emitting transistor D1 is connected with a high level.

[0083] The alarm information includes a light signal generated by the light-emitting transistor D1.

[0084] The reference voltage generation circuit 2 includes a voltage dividing resistor R4 and a variable resistor R5.

[0085] The first end of the voltage dividing resistor R4 is connected with a high level, the second end of the voltage dividing resistor R4 is connected with the first end of the variable resistor R5, and the second end of the variable resistor R5 is grounded.

[0086] The second end of the voltage dividing resistor R4 is electrically connected with the input end of the comparator 3, and the variable resistor R5 is used to adjust the reference voltage by changing the resistance value.

[0087] The system further includes a master control module 5, a human-computer interaction module 6 and an automatic feeding module 7.

[0088] The input end of the master control module 5 is electrically connected with the output end of the switching circuit, and the output end of the master control module 5 is respectively electrically connected with the human-computer interaction module 6 and the automatic feeding module 7.

[0089] The master control module 5 is used to control the human-computer interaction module 6 to output feedback information and control the automatic feeding module 7 to close the automatic feeding function when receiving the trigger signal output by the switching circuit.

[0090] The feedback information includes sound-light alarm information and image information.

[0091] When the printing resin changes from the first state to the second state, the first probe 01 and the second probe 02 are electrically connected, the detection voltage of the second end of the second resistor R2 is greater than the reference voltage, and the comparator 3 is used to output the second feedback control signal when the detection voltage is greater than the reference voltage, so as to switch the automatic feeding function of the automatic feeding module from the closed state to the open state.

[0092] On the other hand, the embodiment of the present application also provides a detection device, which comprises the detection circuit according to any one of the above, and a container 10, an end cover 20, a first detection rod 30 and a second detection rod 40.

[0093] The container 10 and the end cover 20 enclose a containing cavity, the containing cavity is used for containing the printing resin, the first end of the first detection rod 30 and the first end of the second detection rod 40 are respectively connected to the end cover 20, the first detection rod 30 and the second detection rod 40 extend in the direction of the printing resin liquid level in the containing cavity, the second end of the first detection rod 30 and the second end of the second detection rod 40 are opposite to the bottom wall of the container 10, and the second end of the first detection rod 30 and the second end of the second detection rod 40 are used for detecting the printing resin.

[0094] The end cover 20 is detachably connected to the container 10, and the first detection rod 30 and the second detection rod 40 are both conductors.

[0095] The first end of the first detection rod 30 and the first end of the second detection rod 40 are respectively provided with interface ends at the end cover 20, and the two interface ends are respectively used for being electrically connected to the first probe 01 and the second probe 02 through data lines.

[0096] The first probe 01 of the detection circuit 1 detects the printing resin through the second end of the first detection rod 30, the second probe 02 of the detection circuit 1 detects the printing resin through the second end of the second detection rod 40, and when the first detection rod 30 and the second detection rod 40 both detect the printing resin, the first probe 01 and the second probe 02 are electrically connected.

[0097] When the first detection rod 30 and / or the second detection rod 40 do not detect the printing resin, the first probe 01 and the second probe 02 are not electrically connected, and the comparator 3 outputs the first feedback control signal to control the automatic feeding module 7 of the three-dimensional printer to close the automatic feeding function.

[0098] On the other hand, the embodiment of the present application also provides a printing system, which comprises the detection device according to any one of the above and a three-dimensional printer.

[0099] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A detection circuit for the detection of a three-dimensional printing resin, characterized in that Comprising: a detection circuit, a reference voltage generation circuit and a comparator; the detection circuit comprises a first probe, a second probe, a first resistor, a second resistor and a third resistor; the first end of the first resistor is connected to a high level, the second end of the first resistor is electrically connected to the first end of the second resistor, the second end of the second resistor is electrically connected to the first end of the third resistor, and the second end of the third resistor is grounded; the first end of the second resistor is also electrically connected to the first probe, and the second end of the second resistor is also electrically connected to the second probe, the first probe and the second probe are respectively used to connect the printing resin; the second end of the second resistor and the output end of the reference voltage generation circuit are respectively electrically connected to the input end of the comparator; the reference voltage generation circuit is used to output a reference voltage, when the remaining amount of the printing resin is less than a threshold value, the first probe and the second probe are disconnected, the detection voltage of the second end of the second resistor is less than the reference voltage, and the comparator is used to output a first feedback control signal when the detection voltage is less than the reference voltage, to control the automatic feeding module of the three-dimensional printer to close the automatic feeding function.

2. The detection circuit of claim 1, wherein, Further comprising: an indication circuit, the indication circuit comprising a switching circuit and an alarm circuit; the output end of the comparator is electrically connected to the input end of the switching circuit, and the output end of the switching circuit is electrically connected to the input end of the alarm circuit; the switching circuit is used to output a trigger signal when receiving the first feedback control signal, and the alarm circuit is used to output alarm information when receiving the trigger signal.

3. The detection circuit of claim 2, wherein: the switching circuit comprises a first transistor; the alarm circuit comprises a light-emitting transistor; the output end of the comparator is electrically connected to the first end of the first transistor, the second end of the first transistor is connected to a high level and the first end of the light-emitting transistor, the third end of the first transistor is grounded, and the second end of the light-emitting transistor is connected to a high level; the alarm information comprises a light signal generated by the light-emitting transistor.

4. The detection circuit of claim 1, wherein: the reference voltage generation circuit comprises a voltage dividing resistor and a variable resistor; the first end of the voltage dividing resistor is connected to a high level, the second end of the voltage dividing resistor is connected to the first end of the variable resistor, and the second end of the variable resistor is grounded; the second end of the voltage dividing resistor is electrically connected to the input end of the comparator, and the variable resistor is used to adjust the reference voltage by changing the resistance value.

5. The detection circuit of claim 2, wherein, Further comprising: a master control module, a human-computer interaction module and an automatic feeding module; the input end of the master control module is electrically connected to the output end of the switching circuit, and the output end of the master control module is respectively electrically connected to the human-computer interaction module and the automatic feeding module; the master control module is used to control the human-computer interaction module to output feedback information and control the automatic feeding module to close the automatic feeding function when receiving the trigger signal output by the switching circuit; the feedback information comprises alarm information and image information.

6. The detection circuit of claim 1, wherein, The detection circuit further comprises: When the remaining amount of the printing resin changes from less than the threshold value to more than the threshold value, the first probe and the second probe are electrically connected, the detection voltage of the second end of the second resistor is greater than the reference voltage, and the comparator is configured to output a second feedback control signal to switch an automatic feeding function of the automatic feeding module from a closed state to an open state when the detection voltage is greater than the reference voltage.

7. A detection device, characterized in that The detection circuit according to any one of claims 1-6, and a container, a cover, a first detection rod, and a second detection rod. The container and the cover enclose a containing cavity for containing the printing resin, the first end of the first detection rod and the first end of the second detection rod are respectively connected to the cover, the first detection rod and the second detection rod extend in the containing cavity along the direction of the liquid level of the printing resin, and the second end of the first detection rod and the second end of the second detection rod are opposite to the bottom wall of the container, and the second end of the first detection rod and the second end of the second detection rod are configured to detect the printing resin. The cover and the container are detachably connected, and the first detection rod and the second detection rod are conductors.

8. The detection device of claim 7, wherein The first end of the first detection rod and the first end of the second detection rod are respectively provided with interface ends at the cover, and the two interface ends are respectively electrically connected to the first probe and the second probe through data lines. The first probe of the detection circuit detects the printing resin through the second end of the first detection rod, and the second probe of the detection circuit detects the printing resin through the second end of the second detection rod, and when the first detection rod and the second detection rod both detect the printing resin, the first probe and the second probe are electrically connected.

9. The detection device of claim 8, wherein When the first detection rod and / or the second detection rod do not detect the printing resin, the first probe and the second probe are not electrically connected, and the comparator outputs the first feedback control signal to control the automatic feeding module of the three-dimensional printer to close the automatic feeding function.

10. A printing system, characterized by, The detection device according to any one of claims 7-9, and a three-dimensional printer.

Images