Automatic temperature control device and temperature control method suitable for large-format plotter

Abstract

The present application relates to a device and method for automatically controlling temperature of a large-format plotter, which comprises: a heat-insulating shell fixed on a walking slider in the plotter, a nozzle installed inside the heat-insulating shell, and an opening on the bottom of the heat-insulating shell for the nozzle to extend out; a first constant-temperature heating module fixed inside the heat-insulating shell; a fan installed inside the heat-insulating shell above the first constant-temperature heating module; a second constant-temperature heating module fixed on the bottom of the heat-insulating shell and sleeved around the nozzle; a first temperature sensor installed far away from the two constant-temperature heating modules and connected with the outside environment; a second temperature sensor installed inside the heat-insulating shell far away from the first constant-temperature heating module; and a main controller installed in the plotter, connected with the first and second temperature sensors, used for receiving temperature parameters, and connected with the two constant-temperature heating modules and the stirring fan, used for controlling the three to open and close. The present application realizes the wide-temperature working requirement of the plotter.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drawing instrument, and particularly relates to an automatic temperature control device and method suitable for a large-format drawing instrument. BACKGROUND

[0002] As a kind of computer output device, drawing instrument is mostly inkjet printing method, and is mainly used for drawing various surveying and mapping, architectural design, wiring diagram and photo image etc., with drawing instrument gradually used for topographic map, aeronautical chart, coastal chart and high-precision image data output, the printing precision requirement of drawing instrument is higher and higher, but when in extremely cold or hot weather or used in outdoor, vehicle-mounted and other use conditions, temperature can greatly affect printing quality, even at extremely low or high temperature, drawing instrument cannot print.

[0003] As a large and complex electromechanical and software integrated printing output device, when using inkjet printing method, it is difficult to maintain good parameter characteristics in extremely wide temperature of-15 DEG C to 50 DEG C due to the liquid physical characteristics of ink, and it is difficult to realize internal temperature control after the whole drawing instrument is sealed and insulated because large-format paper needs to be transported out of the device during working, so the working temperature range of general drawing instrument is mostly between 5 DEG C and 40 DEG C, and it is difficult to be normally used in low-temperature or high-temperature environment. SUMMARY

[0004] The present application aims at overcoming the deficiencies of prior art, and provides an automatic temperature control device and method suitable for large-format drawing instrument, which can realize wide-temperature working requirement of drawing instrument, thereby improving the applicability of drawing instrument.

[0005] One of the above-mentioned purposes of the present application is realized by the following technical scheme:

[0006] An automatic temperature control device suitable for large-format drawing instrument, characterized by comprising a heat insulation shell, a first constant-temperature heating module, a second constant-temperature heating module, a fan, a first temperature sensor, a second temperature sensor and a main controller.

[0007] The heat insulation shell is fixed on a walking slider in the plotter, and the inside of the heat insulation shell is used for mounting a nozzle; an opening is arranged at the bottom of the heat insulation shell for the nozzle to extend; the first constant temperature heating module is fixedly installed in the inside of the heat insulation shell, and the fan is installed in the inside of the heat insulation shell and located above the first constant temperature heating module; the second temperature sensor is installed in the inside of the heat insulation shell and away from the first constant temperature heating module, and is used for detecting the air temperature in the heat insulation shell; the second constant temperature heating module is a hollow rectangular module, which is fixed to the bottom of the heat insulation shell and sleeved around the nozzle and has a gap with the side of the nozzle, and the second constant temperature heating module is used for heating and keeping warm the nozzle;

[0008] The first temperature sensor is arranged in the inside of the plotter and located in the space outside the heat insulation shell, the installation position of the first temperature sensor is away from the two constant temperature heating modules and is ventilated with the external environment, and the first temperature sensor is used for measuring the ambient temperature;

[0009] The main controller is installed in the plotter, connected with the first temperature sensor and the second temperature sensor, used for receiving the temperature parameters, connected with the first constant temperature heating module, the second constant temperature heating module and the stirring fan, and used for controlling the three to be turned on and turned off.

[0010] Further, the heat insulation shell is made of a polyurethane foaming plate.

[0011] Further, the first constant temperature heating module and the second constant temperature heating module are both made of a heating sheet made of a PTC thermistor.

[0012] The above-mentioned second purpose of the application is realized by the following technical scheme:

[0013] A temperature control method based on the automatic temperature control device suitable for the large-format plotter, comprising the following steps:

[0014] Step one: after the plotter is started, the data of the first temperature sensor, i.e. the ambient temperature c, is read by the main controller;

[0015] Step two: it is determined whether c is greater than 50 DEG C, if yes, high-temperature alarm is prompted, printing cannot be performed, and the process is ended;

[0016] Step three: if c is not greater than 50 DEG C, it is determined whether c is less than -15 DEG C, if c is less than -15 DEG C, low-temperature alarm is prompted, printing cannot be performed, and the process is ended;

[0017] Step four: if c is not less than -15 DEG C, then continue to determine whether c is less than or equal to 50 DEG C and greater than or equal to 15 DEG C, if yes, start normal printing, in the process of printing, after 1 minute, continue to repeat step one; if not, detect the temperature in the heat insulation shell, and start the heating control of the nozzle, the specific process of the heating control is:

[0018] 1) according to the temperature curve L prepared by the main controller, determine the temperature b required to be achieved in the heat insulation shell at this time;

[0019] 2) read the value y of the second temperature sensor by the main controller;

[0020] 3) determine whether y is less than or equal to b-2, if not, start normal printing, and repeat step one after 1 minute; if yes, the main controller starts the first constant temperature heating module, the second constant temperature heating module and the fan, and heats;

[0021] 4) after heating for 1 second, read the value y of the second temperature sensor by the main controller again;

[0022] 5) determine whether y is greater than or equal to b+2, if not, repeat steps 3) and 4); if yes, stop the first constant temperature heating module 4 and the second constant temperature heating module 3, start normal printing, and the fan stops after 10 minutes; after the fan stops, repeat step one after 1 minute to realize printing operation under the condition of temperature detection and temperature control.

[0023] Further: the temperature of the first constant temperature heating module is 70 DEG C when it works stably; the temperature of the second constant temperature heating module is 50 DEG C when it works stably.

[0024] The application has the advantages and positive effects:

[0025] 1) the first constant temperature heating module, the second constant temperature heating module, the fan, the first temperature sensor and the nozzle are wrapped by the heat insulation shell, which plays a role of heat insulation and heat preservation, wherein the jet working surface of the nozzle and one side of the second constant temperature heating module are exposed from the heat insulation shell, the jet working surface of the nozzle is used for jetting ink on the paper to complete the printing operation, so that the nozzle is heated and preserved by the low-power heating method without affecting the inkjet printing.

[0026] 2) the method can detect and control the temperature in real time during the printing operation, so that the nozzle and the jet working surface are in a better temperature environment, and can be used in the temperature range of -15 DEG C to 50 DEG C, which improves the use temperature range of the plotter and meets the requirements of extremely cold, extremely hot climate, outdoor and vehicle use. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1It is the schematic diagram of the device structure of the present application;

[0028] Figure 2 It is the overall structure of the device;

[0029] Figure 3 The temperature relationship curve L when the optimal working temperature a is set as 25℃;

[0030] Figure 4 It is a temperature control flow chart. DETAILED DESCRIPTION

[0031] The structure of the present application is further described below in combination with the drawings and by examples. It should be noted that the present examples are narrative rather than limiting.

[0032] The present application is applicable to a large-format plotter in high and low temperature environment, and has a low-power automatic temperature control device with a nozzle part inside, which comprises a first constant temperature heating module 4, a second constant temperature heating module 3, a fan 5, a first temperature sensor 8, a second temperature sensor 2, a heat insulation shell 6 and a main controller 7. The heat insulation shell forms a closed space, the nozzle is placed in the space, and the nozzle's spraying working surface is extended through the opening at the lower end of the heat insulation shell. The heat insulation shell can control the temperature of the nozzle part in a small space. The heat insulation shell is fixed on a walking slider in the plotter and is driven by a nozzle driving mechanism.

[0033] The first constant temperature heating module is installed in the heat insulation shell and is used for heating in the heat insulation shell. The second constant temperature heating module is a hollow rectangle, is fixed at the bottom of the heat insulation shell, is sleeved around the spraying working surface 1.1 of the nozzle 1, and leaves a certain gap, and is mainly used for heating and keeping warm the spraying working surface of the nozzle during standby and printing. Both constant temperature heating modules adopt heating sheets made of PTC thermistors.

[0034] The fan is placed above the first constant temperature heating module, the air outlet direction is opposite to the first constant temperature heating module, and the fan is used for stirring air, improving the heating efficiency, and making the temperature in the heat insulation shell uniform. The second temperature sensor is placed in the heat insulation shell and is away from the first constant temperature heating module, and is used for measuring the temperature in the heat insulation shell. The first temperature sensor is placed outside the heat insulation shell, is far away from heat sources (the first constant temperature heating module and the second constant temperature heating module) in the plotter and has good ventilation, and is used for measuring the ambient temperature. The main controller is placed in the plotter, is connected with the first temperature sensor and the second temperature sensor, is used for receiving temperature parameters, is connected with the first constant temperature heating module, the second constant temperature heating module and the fan, and is used for controlling the opening and closing of the first constant temperature heating module, the second constant temperature heating module and the fan.

[0035] The automatic temperature control device is used, the spray head spray working surface 1.1 cannot be heat-insulated, and when printing, the spray working surface 1.1 is in contact with the environment, and there is a certain heat exchange, the temperature is inconsistent with the temperature in the heat-insulated shell, and the temperature sensor cannot be installed to measure the temperature when the spray working surface 1.1 is not printing, therefore, through experiments, it is found that when the spray head is printing, the actual temperature of the spray working surface 1.1 is kept at the optimal working temperature a, the relationship between the temperature control temperature b in the heat-insulated shell and the environment temperature c needs to be realized, and the temperature relationship curve L is recorded, preferably, the optimal working temperature a is set to 25 DEG C, Figure 3 The temperature relationship curve L measured when the optimal working temperature a is 25 DEG C is used.

[0036] The application also provides an automatic temperature control method of a plotter, based on the automatic temperature control device, and the method comprises the following steps.

[0037] Step one: after the plotter is started, the main controller reads the data of the first temperature sensor, that is, the environment temperature c;

[0038] Step two: it is determined whether c is greater than 50 DEG C, if yes, high-temperature alarm is prompted, printing cannot be performed, and the process is ended;

[0039] Step three: if c is not greater than 50 DEG C, it is determined whether c is less than -15 DEG C, if yes, low-temperature alarm is prompted, printing cannot be performed, and the process is ended;

[0040] Step four: if c is not less than -15 DEG C, it is determined whether c is less than or equal to 50 DEG C and greater than or equal to 15 DEG C, if yes, normal printing is started, and after 1 minute, step one is repeated; if not, the temperature in the heat-insulated shell is detected, and the heating control of the spray head is started, and the specific process of the heating control is as follows:

[0041] 1) according to the temperature curve L prepared by the main controller, the temperature control temperature b in the heat-insulated shell at this time is determined;

[0042] 2) the value y of the second temperature sensor is read by the main controller;

[0043] 3) it is determined whether y is less than or equal to b-2, if not, normal printing is started, and after 1 minute, step one is repeated; if yes, the first constant-temperature heating module, the second constant-temperature heating module and the fan are started by the main controller, and heating is performed;

[0044] 4) after 1 second of heating, the value y of the second temperature sensor is read again by the main controller;

[0045] 5) judge whether y is greater than or equal to b+2, if not, repeat steps 3) and 4); if yes, stop the first constant temperature heating module 4 and the second constant temperature heating module 3, start normal printing, and the fan stops after a delay of 10 minutes; after the fan stops, repeat step one after 1 minute to realize printing operation under temperature detection and temperature control.

[0046] When the first constant temperature heating module and the second constant temperature heating module are heating, preferably, when the first constant temperature heating module is working stably, the temperature is preferably about 70℃; when the second constant temperature heating module is working stably, the temperature is preferably about 50℃.

[0047] For the above automatic temperature control device, the ink for plotter is modulated and matched, so that it has good printing effect at 15℃ to 50℃, and its solidification temperature is not higher than -20℃.

[0048] Although the embodiments and drawings of the present application are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit of the present application and the appended claims, therefore, the scope of the present application is not limited to the disclosed contents of the embodiments and drawings.

Claims

1. A temperature control method suitable for a large-format plotter automatic temperature control device, the temperature control device based on which comprises a heat-insulated shell, a first constant-temperature heating module, a second constant-temperature heating module, a fan, a first temperature sensor, a second temperature sensor and a main controller; the heat-insulated shell is fixed to a walking slider inside the plotter, and an inside of the heat-insulated shell is used for mounting a nozzle; an opening is arranged at a bottom of the heat-insulated shell for a jet working surface of the nozzle to extend out; the first constant-temperature heating module is fixedly installed inside the heat-insulated shell, and the fan is installed inside the heat-insulated shell and located above the first constant-temperature heating module; the second temperature sensor is installed at a position inside the heat-insulated shell away from the first constant-temperature heating module and is used for detecting an air temperature inside the heat-insulated shell; the second constant-temperature heating module is a hollow rectangular module, is fixed to the bottom of the heat-insulated shell, is sleeved around the jet working surface of the nozzle and has a gap with side portions of the jet working surface, and is used for heating and keeping warm the jet working surface; the first temperature sensor is arranged inside the plotter and located in a space outside the heat-insulated shell, an installation position of the first temperature sensor is away from the two constant-temperature heating modules and is ventilated with an external environment, and the first temperature sensor is used for measuring an ambient temperature; the main controller is installed inside the plotter, is connected with the first temperature sensor and the second temperature sensor, is used for receiving temperature parameters, is connected with the first constant-temperature heating module, the second constant-temperature heating module and the stirring fan and is used for controlling the three to be turned on and turned off; the temperature control method comprises the following steps: step one: after the plotter is started, data of the first temperature sensor, i.e. an ambient temperature c, is read by the main controller; step two: whether c is greater than 50 DEG C is determined, if yes, high-temperature alarm is prompted, printing cannot be performed, and the process is ended; step three: if c is not greater than 50 DEG C, whether c is less than -15 DEG C is determined, if yes, low-temperature alarm is prompted, printing cannot be performed, and the process is ended; step four: if c is not less than -15 DEG C, whether c is less than or equal to 50 DEG C and greater than or equal to 15 DEG C is determined, if yes, normal printing is started, step one is repeatedly continued after 1 minute in the process of printing; if not, a temperature inside the heat-insulated shell is detected, and heating control of the nozzle is started; a specific process of the heating control is as follows: 1) a temperature control temperature b required to be achieved inside the heat-insulated shell at this time is determined according to a temperature curve L prepared by the main controller; 2) a value y of the second temperature sensor is read by the main controller; 3) whether y is less than or equal to b-2 is determined, if not, normal printing is started, and step one is repeatedly continued after 1 minute; if yes, the first constant-temperature heating module, the second constant-temperature heating module and the fan are started by the main controller to heat; 4) the value y of the second temperature sensor is read again by the main controller after 1 second of heating; 5) determine whether y is greater than or equal to b+2, if not, repeat steps 3) and 4); if yes, stop the first constant temperature heating module (4), the second constant temperature heating module (3), start normal printing, the fan is delayed for 10 minutes and then stopped; after the fan is stopped, repeat step one after 1 minute to realize printing operation under the condition of temperature detection and temperature control.

2. The temperature control method for large format plotter automatic temperature control device according to claim 1, characterized in that: The heat insulation shell is made of polyurethane foaming plate.

3. The temperature control method for large format plotter automatic temperature control device according to claim 1, wherein: The first constant temperature heating module and the second constant temperature heating module both adopt heating sheets made of PTC thermistor.

4. The temperature control method for a large-format plotter automatic temperature control device according to claim 1, characterized in that: The first constant temperature heating module is stable at 70 DEG C, and the second constant temperature heating module is stable at 50 DEG C.

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