System, method, device and equipment for controlling liquid level of resin tank of 3D printer

Abstract

The invention relates to the technical field of liquid level control, and discloses a liquid level control system, method, device and equipment for a resin tank of a 3D printer, and the system comprises liquid level detection equipment which is used for detecting the real-time liquid level height; the cavity is immersed into the resin in the resin tank by a preset depth; the vacuum pump is opened or closed according to the pressure reduction instruction of the controller to adjust the internal pressure of the cavity; the pressure relief equipment is used for opening or closing according to the pressure boosting instruction of the controller to adjust the internal pressure of the cavity; and the controller is used for comparing the real-time liquid level height with the target liquid level height, controlling the vacuum pump or the pressure relief equipment to be opened and closed according to a comparison result, and adjusting the internal pressure of the cavity so as to control the liquid level height. The negative pressure adsorption principle is utilized, the pressure in the cavity is controlled through the vacuum pump and the pressure release valve, the liquid level in the resin tank is adjusted, the control cost of the system is reduced, and the control precision of the liquid level in the resin tank is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level control, and in particular to a 3D printer resin tank liquid level control system, method, device and equipment. Background Art

[0002] Photocuring 3D printing technology is a rapid prototyping technology based on liquid photosensitive materials. Liquid photosensitive materials are usually resins, which are stored in resin tanks. The height of the resin liquid level is an important factor in ensuring the 3D printing effect. If the liquid level is changed by increasing or decreasing the amount of resin in the resin tank, the 3D printer needs to be very large. In the prior art, a laser displacement sensor is installed just above the liquid level in the resin tank to detect the liquid level. The resin tank is installed on a platform, and the platform drives the transmission mechanism up and down through a motor. The controller drives the motor to rotate according to the target liquid level, driving the transmission mechanism to adjust the liquid level in the resin tank, and then uses the displacement sensor to determine whether the adjusted liquid level has reached the target liquid level.

[0003] In the prior art, the liquid level is adjusted by driving the resin tank up and down through a transmission mechanism. The adjustment accuracy of the liquid level is limited by the accuracy of the transmission mechanism. If the accuracy of the transmission mechanism is improved, the cost will increase a lot. Summary of the invention

[0004] In view of this, the present invention provides a 3D printer resin tank liquid level control system, method, device and equipment to solve the problem of how to improve the liquid level height adjustment accuracy.

[0005] In a first aspect, the present invention provides a 3D printer resin tank liquid level control system, the system comprising: a liquid level detection device, a cavity, a pressure relief device and a vacuum pump connected to the cavity through air pipes, and a controller, wherein:

[0006] A liquid level detection device, whose output end is connected to the controller, is used to detect the real-time liquid level height in the resin tank and transmit the real-time liquid level height to the controller;

[0007] The cavity is immersed in the resin in the resin tank to a preset depth. When the internal pressure is greater than the external atmospheric pressure, the resin inside enters the resin tank and the liquid level in the resin tank increases. When the internal pressure is less than the external atmospheric pressure, the resin in the resin tank enters the cavity and the liquid level in the resin tank decreases.

[0008] A vacuum pump, whose input end is connected to the controller, is used to turn on or off according to the pressure reduction instruction of the controller to adjust the internal pressure of the cavity;

[0009] A pressure relief device, the input end of which is connected to the controller and is used to open or close according to the boost command of the controller to adjust the internal pressure of the cavity;

[0010] The controller is used to compare the real-time liquid level with the target liquid level, and control the opening and closing of the vacuum pump or the pressure relief device according to the comparison result, so as to adjust the internal pressure of the cavity and control the liquid level.

[0011] The 3D printer resin tank liquid level control system provided by the present invention utilizes the negative pressure adsorption principle, controls the pressure in the cavity through a vacuum pump and a pressure relief valve, and adjusts the liquid level in the resin tank, thereby reducing the control cost of the system and improving the accuracy of controlling the liquid level in the resin tank.

[0012] In an optional embodiment, the liquid level detection device is a laser displacement sensor, which is installed at a preset position above the resin tank.

[0013] The 3D printer resin tank liquid level control system provided by the present invention utilizes a laser displacement sensor installed above the resin tank to detect the real-time liquid level height without immersing the sensor into the resin, thereby improving the service life of the laser displacement sensor and the accuracy of liquid level detection.

[0014] In a second aspect, an embodiment of the present invention provides a 3D printer resin tank liquid level control method, the method is applied to any 3D printer resin tank liquid level control system of the first aspect, comprising:

[0015] Obtaining the real-time liquid level in the resin tank, and calculating the height difference between the real-time liquid level and the target liquid level;

[0016] According to the relationship between the height difference and the preset difference range, the opening and closing of the vacuum pump or the pressure relief valve is controlled to adjust the real-time liquid level so that the height difference is within the preset difference range.

[0017] The 3D printer resin tank liquid level control method provided by the present invention utilizes the negative pressure adsorption principle, controls the pressure in the cavity through a vacuum pump and a pressure relief valve, causes the resin to flow between the resin tank and the inside of the cavity, and realizes the adjustment of the liquid level height in the resin tank, thereby reducing the control cost of the system and improving the accuracy of controlling the liquid level height in the resin tank.

[0018] In an optional implementation, according to the relationship between the height difference and the preset difference range, the opening and closing of the vacuum pump or the pressure relief valve is controlled to adjust the real-time liquid level, including:

[0019] When the height difference is greater than the upper limit of the preset difference range, the vacuum pump is controlled to open and the pressure relief valve is closed, thereby increasing the negative pressure in the cavity, causing the resin in the resin tank to enter the cavity, and the real-time liquid level in the resin tank is reduced.

[0020] The 3D printer resin tank liquid level control method provided by the present invention utilizes a vacuum pump to extract gas in a cavity to increase the negative pressure in the cavity, thereby raising the liquid level in the cavity and reducing the real-time liquid level in the resin tank. The vacuum pump has low cost, thereby reducing the production cost of the 3D printer. The liquid level is controlled by utilizing the negative pressure adsorption principle, and the control accuracy is high.

[0021] In an optional embodiment, according to the relationship between the height difference and the preset difference range, the opening and closing of the vacuum pump or the pressure relief valve is controlled to adjust the real-time liquid level, and the method further includes:

[0022] When the height difference is less than the lower limit of the preset difference range, the vacuum pump is controlled to close and the pressure relief valve is opened to reduce the negative pressure in the cavity, so that the resin in the cavity enters the resin tank and the real-time liquid level in the resin tank increases.

[0023] The 3D printer resin tank liquid level control method provided by the present invention utilizes a pressure relief valve to reduce the negative pressure inside a cavity, thereby lowering the liquid level height of the cavity and raising the real-time liquid level height in the resin tank. The pressure relief valve has low cost, thus reducing the production cost of the 3D printer. The control principle is simple and the control accuracy of the liquid level height is high.

[0024] In an optional embodiment, according to the relationship between the height difference and the preset difference range, the opening and closing of the vacuum pump or the pressure relief valve is controlled to adjust the real-time liquid level, and the method further includes:

[0025] When the height difference is within the preset difference range, the vacuum pump is controlled to be closed, the pressure relief valve is closed, and the real-time liquid level in the resin tank is controlled to remain unchanged.

[0026] The 3D printer resin tank liquid level control method provided by the present invention closes the vacuum pump and the pressure relief valve when the height difference between the real-time liquid level and the target liquid level is within a preset difference range, maintains the current state unchanged, avoids frequent opening or closing of the vacuum pump and the pressure relief valve, and extends the service life of the vacuum pump and the pressure relief valve.

[0027] In a third aspect, the present invention provides a 3D printer resin tank liquid level control device, the device is applied to any 3D printer resin tank liquid level control system of the first aspect, the device comprising:

[0028] A height detection module is used to obtain the real-time liquid level in the resin tank and calculate the height difference between the real-time liquid level and the target liquid level;

[0029] The height control module is used to control the opening and closing of the vacuum pump or the pressure relief valve according to the relationship between the height difference and the preset difference range, and adjust the real-time liquid level so that the height difference is within the preset difference range.

[0030] In a fourth aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0031] In a fifth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method of the first aspect or any corresponding embodiment thereof.

[0032] In a sixth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a schematic structural diagram of a 3D printer resin tank liquid level control system according to an embodiment of the present invention;

[0035] Figure 2 is a schematic structural diagram of another 3D printer resin tank liquid level control system according to an embodiment of the present invention;

[0036] Figure 3 is a schematic flow chart of a method for controlling a liquid level in a resin tank of a 3D printer according to an embodiment of the present invention;

[0037] Figure 4 is a flow chart of another 3D printer resin tank liquid level control method according to an embodiment of the present invention;

[0038] Figure 5 is a structural block diagram of a 3D printer resin tank liquid level control device according to an embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] The embodiment of the present invention provides a 3D printer resin tank liquid level control system and method, which controls the liquid level in the resin tank by controlling the opening and closing of a vacuum pump or a pressure relief valve to adjust the negative pressure in the cavity, so as to achieve the effect of improving the control accuracy of the liquid level in the resin tank.

[0042] According to an embodiment of the present invention, a 3D printer resin tank liquid level control system embodiment is provided, such as Figure 1 As shown, the system includes: a liquid level detection device 1, a cavity 2, a pressure relief valve 3 and a vacuum pump 4 respectively connected to the cavity through air pipes, and a controller 5.

[0043] like Figure 1 As shown, the liquid level detection device 1 has an output end connected to the controller 5 for detecting the real-time liquid level height in the resin tank and transmitting the real-time liquid level height to the controller 5 .

[0044] Specifically, there are many ways to detect the liquid level, and there are many types of corresponding liquid level detection devices 1. According to the use requirements of the liquid level detection device 1, the liquid level detection device 1 is placed in different places. For example, the liquid level sensor can be completely immersed in the resin or float on the resin liquid surface. This is only an example, but not limited to this. The function of the liquid level detection device 1 is to detect the real-time liquid level in the resin tank and transmit the real-time liquid level data to the controller 5 in the form of a digital signal.

[0045] like Figure 1 As shown, cavity 2 is immersed in the resin in the resin tank to a preset depth. When the internal pressure is greater than the external atmospheric pressure, the resin inside enters the resin tank and the liquid level in the resin tank increases. When the internal pressure is less than the external atmospheric pressure, the resin in the resin tank enters the cavity 2 and the liquid level in the resin tank decreases.

[0046] Specifically, the cavity 2 is a closed object with a hollow interior. When it is immersed in the resin, the liquid level in the resin tank will rise. According to the actual situation, the preset depth of the cavity 2 immersed in the resin is determined. There is a channel immersed in the resin on the cavity 2. The channel needs to be immersed in the resin, that is, lower than the resin liquid level, for the resin to flow inside and outside the cavity 2. There is a channel at the upper end of the cavity 2 connected to the vacuum pump 4 through the exhaust air pipe, and there is another channel at the upper end of the cavity 2 connected to the deflation valve through the deflation air pipe.

[0047] like Figure 1 As shown, the vacuum pump 4 has its input end connected to the controller 5 and is used to be turned on or off according to the pressure reduction instruction of the controller 5 to adjust the internal pressure of the cavity 2.

[0048] Specifically, when the vacuum pump 4 receives the pressure reduction instruction sent by the controller 5, the vacuum pump 4 starts to rotate, pumps the gas inside the cavity 2 into the atmosphere, reduces the internal pressure of the cavity 2, and makes the cavity 2 in a negative pressure state. If the vacuum pump 4 does not receive the pressure reduction instruction, it remains closed.

[0049] like Figure 1 As shown, the pressure relief valve 3 has its input end connected to the controller 5 and is used to open or close according to the pressure increase instruction of the controller 5 to adjust the internal pressure of the cavity 2.

[0050] Specifically, when the pressure relief valve 3 receives the pressure increase command sent by the controller 5, the pressure relief valve 3 opens, and the gas at the external atmospheric pressure enters the cavity 2, and the internal pressure of the cavity 2 increases. If the pressure relief valve 3 does not receive the pressure increase command, it remains closed.

[0051] like Figure 1 As shown, the controller 5 is used to compare the real-time liquid level with the target liquid level, and control the opening and closing of the vacuum pump 4 or the pressure relief valve 3 according to the comparison result, so as to adjust the internal pressure of the cavity 2 to control the liquid level.

[0052] Specifically, according to actual 3D printing requirements, a pre-set target liquid level height will be stored in the controller 5, and the opening and closing of the vacuum pump 4 or the pressure relief valve 3 will be controlled according to the relationship between the real-time liquid level height detected by the liquid level detection device 1 and the target liquid level height, specifically including: when the height difference between the real-time liquid level height and the target liquid level height is greater than the upper limit of the preset difference range, the vacuum pump 4 is turned on, the pressure in the cavity 2 is reduced, the resin in the resin tank enters the cavity 2, the liquid level in the cavity 2 rises, and the liquid level in the resin tank drops until the height difference between the real-time liquid level height and the target liquid level height is within the preset difference range, and the vacuum pump 4 is turned off; when the difference between the real-time liquid level height and the target liquid level height is less than the lower limit of the preset difference range, the pressure relief valve 3 is opened, and the pressure in the cavity 2 is increased , the resin in cavity 2 enters the resin tank, the liquid level in cavity 2 decreases, and the liquid level in the resin tank increases until the height difference between the real-time liquid level and the target liquid level is within the preset difference range, and the pressure relief valve 3 is closed; if the height difference between the real-time liquid level and the target liquid level is less than the lower limit of the preset difference range, and there is no resin in cavity 2, and the pressure relief valve 3 is in an open state, at this time, there is no resin in cavity 2 that can enter the resin tank, resulting in a continuous increase in the pressure in cavity 2. If the pressure in cavity 2 is greater than the preset pressure threshold, an alarm is issued to remind the operator to check the liquid level in the resin tank and take measures such as replenishing resin to increase the real-time liquid level so that the height difference between the real-time liquid level and the target liquid level remains within the preset difference range. This is only an example, but is not limited to this.

[0053] The 3D printer resin tank liquid level control system provided in this embodiment utilizes the negative pressure adsorption principle, controls the pressure in the cavity 2 through the vacuum pump 4 and the pressure relief valve 3, and adjusts the liquid level in the resin tank, thereby reducing the control cost of the system and improving the accuracy of controlling the liquid level in the resin tank. Only the cavity 2 is placed in the resin tank, which saves space and is suitable for small-format 3D printers.

[0054] In some optional embodiments, such as Figure 2 As shown, the liquid level detection device 1 is a laser displacement sensor, which is installed at a preset position above the resin tank.

[0055] Specifically, the laser displacement sensor can directly measure the distance from the resin liquid surface to the laser displacement sensor. The preset position of its installation should satisfy the requirement that the laser sent and received by the laser displacement sensor is perpendicular to the liquid surface. The real-time liquid surface height is determined based on the total distance from the preset position of the laser displacement sensor to the bottom of the resin tank. The specific calculation formula is: real-time liquid surface height = total distance - distance from the resin liquid surface to the laser displacement sensor. Since the installation position of the laser displacement sensor is fixed, the total distance from the resin tank bottom is determined. To ensure the accuracy of the measurement, the laser displacement sensor can be installed first, and then, when the resin tank is empty, the laser displacement sensor can be used to measure the total distance from the preset position to the bottom of the resin tank. This is only an example, but is not limited to this.

[0056] The 3D printer resin tank liquid level control system provided in this embodiment uses a laser displacement sensor installed above the resin tank to detect the real-time liquid level height without immersing it in the resin, thereby improving the service life of the laser displacement sensor and the accuracy of liquid level detection.

[0057] According to an embodiment of the present invention, an embodiment of a 3D printer resin tank liquid level control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0058] In this embodiment, a 3D printer resin tank liquid level control method is provided, which can be used for the 3D printer resin tank liquid level control system in the above embodiment. Figure 3 : is a flow chart of a method for controlling the liquid level of a resin tank of a 3D printer according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0059] Step S101, obtaining the real-time liquid level in the resin tank, and calculating the height difference between the real-time liquid level and the target liquid level.

[0060] Specifically, the real-time liquid level in the resin tank is detected by the liquid level detection device 1, and then sent to the controller 5 in the form of a digital signal. The controller 5 stores the target liquid level and directly subtracts the real-time liquid level from the target liquid level to obtain the height difference between the two.

[0061] Step S102, according to the relationship between the height difference and the preset difference range, control the opening and closing of the vacuum pump 4 or the pressure relief valve 3 to adjust the real-time liquid level so that the height difference is within the preset difference range.

[0062] Specifically, in order to ensure the 3D printing effect, it is necessary to maintain the real-time liquid level within a positive and negative error range of the target liquid level, so a preset difference range is set, and the opening and closing of the vacuum pump 4 or the pressure relief valve 3 is controlled according to the relationship between the height difference and the preset difference range. By changing the negative pressure inside the cavity 2, the resin flows between the cavity 2 and the resin tank, thereby achieving the purpose of adjusting the real-time liquid level and keeping the height difference within the preset difference range.

[0063] The specific control process includes: when the height difference between the real-time liquid level and the target liquid level is greater than the upper limit of the preset difference range, the vacuum pump 4 is turned on, the pressure in the cavity 2 is reduced, the negative pressure inside the cavity 2 is increased, the resin in the resin tank enters the cavity 2, the liquid level inside the cavity 2 rises, and the liquid level in the resin tank decreases until the height difference between the real-time liquid level and the target liquid level is within the preset difference range, and the vacuum pump 4 is turned off; when the difference between the real-time liquid level and the target liquid level is less than the lower limit of the preset difference range, the pressure relief valve 3 is opened, the pressure in the cavity 2 is increased, the negative pressure inside the cavity 2 is reduced, the resin in the cavity 2 enters the resin tank, the liquid level in the cavity 2 decreases, and the liquid level in the resin tank increases until the height difference between the real-time liquid level and the target liquid level is within the preset difference range, and the pressure relief valve 3 is closed.

[0064] The 3D printer resin tank liquid level control method provided in this embodiment utilizes the negative pressure adsorption principle, controls the pressure in the cavity 2 through the vacuum pump 4 and the pressure relief valve 3, and allows the resin to flow between the resin tank and the inside of the cavity 2, thereby adjusting the liquid level in the resin tank, reducing the control cost of the system, and improving the accuracy of controlling the liquid level in the resin tank.

[0065] In this embodiment, a 3D printer resin tank liquid level control method is provided, which can be used for the 3D printer resin tank liquid level control system in the above embodiment. Figure 4 : is a flow chart of a method for controlling the liquid level of a resin tank of a 3D printer according to an embodiment of the present invention. Figure 4 As shown, the process includes the following steps:

[0066] Step S201, obtain the real-time liquid level in the resin tank, and calculate the height difference between the real-time liquid level and the target liquid level. Figure 3 Step S101 of the illustrated embodiment will not be described in detail here.

[0067] Step S202, according to the relationship between the height difference and the preset difference range, control the opening and closing of the vacuum pump 4 or the pressure relief valve 3, and adjust the real-time liquid level so that the height difference is within the preset difference range.

[0068] Specifically, the above step S202 includes:

[0069] Step S2021, when the height difference is greater than the upper limit of the preset difference range, the vacuum pump 4 is controlled to open and the pressure relief valve 3 is closed, so as to increase the negative pressure in the cavity 2, so that the resin in the resin tank enters the cavity 2, and the real-time liquid level in the resin tank is reduced.

[0070] Specifically, in the initial state of the 3D printer resin tank liquid level control system, the interior of the cavity 2 is empty, and the pressure inside is consistent with the external atmospheric pressure, and the resin will not enter the cavity 2 from the resin tank. The target liquid level is set according to the actual needs of 3D printing. The liquid level will decrease after the resin is consumed during the printing process, so the height difference between the real-time liquid level and the target liquid level will change. When the height difference is greater than the upper limit of the preset difference range, for example, the real-time liquid level is 250mm, the target liquid level is 220mm, and the preset difference range is -10mm to 10mm, then the height difference is greater than the upper limit of the preset difference range, and the vacuum pump 4 needs to be turned on and the pressure relief valve 3 needs to be closed to increase the negative pressure in the cavity 2, so that the resin in the resin tank enters the cavity 2, and the real-time liquid level in the resin tank decreases.

[0071] Step S2022, when the height difference is less than the lower limit of the preset difference range, the vacuum pump 4 is controlled to be closed and the pressure relief valve 3 is opened to reduce the negative pressure in the cavity 2, so that the resin in the cavity 2 enters the resin tank, and the real-time liquid level height in the resin tank increases.

[0072] Specifically, when the height difference is less than the lower limit of the preset difference range, for example, the real-time liquid level height is 200 mm, the target liquid level height is 220 mm, and the preset difference range is -10 mm to 10 mm, then the height difference is less than the lower limit of the preset difference range, and the pressure relief valve 3 needs to be opened and the vacuum pump 4 needs to be closed to reduce the negative pressure in the cavity 2, so that the resin inside the cavity 2 enters the resin tank, and the real-time liquid level height in the resin tank increases.

[0073] The 3D printer resin tank liquid level control method provided in this embodiment uses a vacuum pump 4 and a pressure relief valve 3 to adjust the negative pressure in the cavity 2, change the liquid level in the cavity 2, and control the real-time liquid level in the resin tank. The vacuum pump 4 and the pressure relief valve 3 are low in cost, which reduces the production cost of the 3D printer.

[0074] Step S2023, when the height difference is within the preset difference range, the vacuum pump 4 is controlled to be closed, the pressure relief valve 3 is controlled to be closed, and the real-time liquid level in the resin tank is controlled to remain unchanged.

[0075] The 3D printer resin tank liquid level control method provided in this embodiment utilizes the negative pressure adsorption principle, controls the pressure in the cavity 2 through the vacuum pump 4 and the pressure relief valve 3, and makes the resin flow between the resin tank and the cavity 2, thereby adjusting the liquid level in the resin tank, reducing the control cost of the system, and improving the accuracy of controlling the liquid level in the resin tank. When the height difference between the real-time liquid level and the target liquid level is within the preset difference range, the vacuum pump 4 and the pressure relief valve 3 are turned off to maintain the current state unchanged, avoiding frequent opening or closing of the vacuum pump 4 and the pressure relief valve 3, and extending the service life of the vacuum pump 4 and the pressure relief valve 3.

[0076] In this embodiment, a 3D printer resin tank liquid level control device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be repeated here. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0077] This embodiment provides a 3D printer resin tank liquid level control device, such as Figure 5 As shown, including:

[0078] The height detection module 501 is used to obtain the real-time liquid level in the resin tank and calculate the height difference between the real-time liquid level and the target liquid level.

[0079] The height control module 502 is used to control the opening and closing of the vacuum pump 4 or the pressure relief valve 3 according to the relationship between the height difference and the preset difference range, and adjust the real-time liquid level so that the height difference is within the preset difference range.

[0080] In some optional implementations, the altitude control module 502 includes:

[0081] The vacuum pump 4 control unit is used to control the vacuum pump 4 to open and the pressure relief valve 3 to close when the height difference is greater than the upper limit of the preset difference range, thereby increasing the negative pressure in the cavity 2, allowing the resin in the resin tank to enter the cavity 2, and reducing the real-time liquid level height in the resin tank.

[0082] The pressure relief valve 3 control unit is used to control the vacuum pump 4 to close and the pressure relief valve 3 to open when the height difference is less than the lower limit of the preset difference range, thereby reducing the negative pressure in the cavity 2, allowing the resin in the cavity 2 to enter the resin tank, and the real-time liquid level height in the resin tank increases.

[0083] The state maintaining unit is used to control the vacuum pump 4 to be turned off and the pressure relief valve 3 to be turned off when the height difference is within a preset difference range, so as to control the real-time liquid level in the resin tank to remain unchanged.

[0084] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0085] The 3D printer resin tank liquid level control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0086] The embodiment of the present invention also provides a computer device having the above Figure 5 The 3D printer resin tank liquid level control device shown.

[0087] See also Figure 6 , Figure 6 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 6 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 A processor 10 is taken as an example.

[0088] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0089] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0090] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0091] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0092] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0093] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0094] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0095] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A 3D printer resin tank liquid level control system, characterized in that: The system comprises: a liquid level detection device, a cavity, a pressure relief device and a vacuum pump respectively connected to the cavity through an air pipe, and a controller, wherein: A liquid level detection device, whose output end is connected to the controller, is used to detect the real-time liquid level height in the resin tank and transmit the real-time liquid level height to the controller; The cavity is immersed in the resin in the resin tank to a preset depth. When the internal pressure is greater than the external atmospheric pressure, the resin inside enters the resin tank and the liquid level in the resin tank increases. When the internal pressure is less than the external atmospheric pressure, the resin in the resin tank enters the cavity and the liquid level in the resin tank decreases. A vacuum pump, whose input end is connected to the controller and is used to be turned on or off according to a pressure reduction instruction of the controller to adjust the internal pressure of the cavity; A pressure relief device, the input end of which is connected to the controller and is used to open or close according to a pressure increase instruction of the controller to adjust the internal pressure of the cavity; The controller is used to compare the real-time liquid level with the target liquid level, and control the opening and closing of the vacuum pump or the pressure relief device according to the comparison result, so as to adjust the internal pressure of the cavity to control the liquid level.

2. The system according to claim 1, characterized in that The liquid level detection device is a laser displacement sensor, which is installed at a preset position above the resin tank.

3. A 3D printer resin tank liquid level control method, characterized in that: The method is applied to the 3D printer resin tank liquid level control system according to any one of claims 1 and 2, comprising: Obtaining a real-time liquid level in the resin tank, and calculating a height difference between the real-time liquid level and a target liquid level; According to the relationship between the height difference and the preset difference range, the opening and closing of the vacuum pump or the pressure relief valve is controlled to adjust the real-time liquid level so that the height difference is within the preset difference range.

4. The method according to claim 3, characterized in that According to the relationship between the height difference and the preset difference range, the opening and closing of the vacuum pump or the pressure relief valve is controlled to adjust the real-time liquid level, including: When the height difference is greater than the upper limit of the preset difference range, the vacuum pump is controlled to open and the pressure relief valve is closed, thereby increasing the negative pressure in the cavity, causing the resin in the resin tank to enter the cavity, and reducing the real-time liquid level in the resin tank.

5. The method according to claim 3, characterized in that: According to the relationship between the height difference and the preset difference range, the vacuum pump or the pressure relief valve is controlled to open and close, and the real-time liquid level is adjusted, and the method further includes: When the height difference is less than the lower limit of the preset difference range, the vacuum pump is controlled to be closed and the pressure relief valve is opened to reduce the negative pressure in the cavity, so that the resin in the cavity enters the resin tank and the real-time liquid level in the resin tank increases.

6. The method according to claim 3, characterized in that According to the relationship between the height difference and the preset difference range, the vacuum pump or the pressure relief valve is controlled to open and close, and the real-time liquid level is adjusted, and the method further includes: When the height difference is within a preset difference range, the vacuum pump is controlled to be turned off, the pressure relief valve is controlled to be closed, and the real-time liquid level in the resin tank is controlled to remain unchanged.

7. A 3D printer resin tank liquid level control device, characterized in that: The device is applied to the 3D printer resin tank liquid level control system according to any one of claims 1 and 2, and the device comprises: A height detection module is used to obtain the real-time liquid level in the resin tank and calculate the height difference between the real-time liquid level and the target liquid level; The height adjustment module is used to control the opening and closing of the vacuum pump or the pressure relief valve according to the relationship between the height difference and the preset difference range, and adjust the real-time liquid level so that the height difference is within the preset difference range.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 3 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method according to any one of claims 3 to 6.

10. A computer program product, characterized in that The method comprises computer instructions for causing a computer to execute the method according to any one of claims 3 to 6.

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