Constant temperature device enabling actuator to be suitable for low-temperature environment

Abstract

The invention discloses a constant temperature device enabling an actuator to be suitable for a low-temperature environment, the constant temperature device comprises a temperature sampling circuit, a signal processing circuit and an output circuit, the temperature sampling circuit collects the temperature of the environment where the actuator is located and outputs a collection voltage VD, and the collection voltage VD serves as the input voltage of the signal processing circuit; the output voltage of the signal processing circuit comprises a voltage V0 and a voltage VOUT1; and the voltage V0 and the voltage VOUT1 are used as input voltages of the output circuit. According to the actuator, when the temperature is too low, the heating piece in the actuator is heated, the mainboard and the matched module do not work, when the temperature in the actuator is increased to the working range, the heating piece stops heating, the mainboard works, and the situation that the temperature of the actuator is too high and use of the actuator is affected due to the fact that the actuator is heated at the normal temperature or too high temperature is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of actuators, and in particular to a constant temperature device that enables an actuator to be applicable to a low-temperature environment. Background Art

[0002] Currently, if an actuator is to operate normally at -60°, most adopt two solutions. One is to separate the control module and the electric device and insulate them separately. The disadvantages of this solution are: increased costs, mainly in terms of the actuator housing cost, the hard wiring cost between the control module and the electric device, the on-site installation cost, and maintenance, etc.; it is also affected by the on-site installation location. Another solution is to use military-grade devices for all the internal electronic components of the actuator. The temperature range of military-grade electronic components is -70° to 125°. The disadvantages of this solution are: using military-grade devices increases the hardware cost and the device procurement cycle. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to provide a constant temperature device that enables an actuator to be applicable to a low-temperature environment.

[0004] The technical solution adopted by the present invention to solve the above technical problem is: a constant temperature device that enables an actuator to be applicable to a low-temperature environment, including a temperature sampling circuit, a signal processing circuit, and an output circuit. The temperature sampling circuit collects the temperature of the environment where the actuator is located and outputs a sampled voltage V_D, and the sampled voltage V_D serves as the input voltage of the signal processing circuit; the output voltage of the signal processing circuit includes a voltage V0 and a voltage VOUT1; when the sampled voltage V_D is greater than a preset voltage, the voltage values of the voltage V0 and the voltage VOUT1 are 0; when the sampled voltage V_D is less than the preset voltage, the voltage values of the voltage V0 and the voltage VOUT1 are greater than 0.

[0005] The output circuit includes a relay K64 and a relay K65. The 8th and 1st feet of the normally open contact of the relay K64 are respectively connected to the A end and the B end of an external power supply, and the 7th and 2nd feet of the common contact of the relay K64 are respectively connected to both ends of the power supply of the main board of the actuator.

[0006] The 3rd and 6th feet of the normally closed contact of the relay K65 are respectively connected to the B end of the external power supply, and the 7th and 2nd feet of the common contact of the relay K65 are both connected to one end of the power supply port of the heating element, and the other end of the power supply port of the heating element is connected to the A end of the external power supply.

[0007] The voltage V0 and the voltage VOUT1 serve as the input voltages of the output circuit. When the voltage values of the voltage V0 and the voltage VOUT1 are 0, the relay K64 and the relay K65 do not operate, and the A terminal and the B terminal of the external power supply are respectively connected to both ends of the power supply port of the heating sheet. When the voltage values of the voltage V0 and the voltage VOUT1 are greater than 0, the relay K64 and the relay K65 operate, and the A terminal and the B terminal of the external power supply are respectively connected to both ends of the power supply of the main board of the actuator.

[0008] Preferably, a constant temperature device for making the actuator applicable to a low-temperature environment includes 3 heating sheets. The 7th pin and the 2nd pin of the common point of the relay K65 are both connected to one end of the power supply ports of the three heating sheets, and the other ends of the power supply ports of the three heating sheets are all connected to the A terminal of the external power supply. The heating sheets are installed inside the box of the actuator.

[0009] Preferably, in the output circuit, the voltage V0 is connected to the base of the triode Q66, the emitter of the triode Q66 is grounded, the collector of the triode Q66 is connected to the collector of the triode Q5, the positive terminal of the diode D110, and one end of the coil of the relay K64. The negative terminal of the diode D110 and the other end of the coil of the relay K64 are connected to the voltage V6. The emitter of the triode Q5 is grounded. The voltage V0 is connected to the base of the triode Q5 through the resistor R52 and the resistor R53, and the voltage V0 is grounded through the resistor R52 and the resistor R54.

[0010] In the output circuit, the voltage VOUT1 is connected to the base of the triode Q6 through the resistor R46, the emitter of the triode Q6 is grounded, the collector of the triode Q6 is connected to the collector of the triode Q64, the positive terminal of the diode D111, and one end of the coil of the relay K65. The negative terminal of the diode D111 and the other end of the coil of the relay K65 are connected to the voltage V6. The emitter of the triode Q64 is grounded. The voltage VOUT1 is connected to the base of the triode Q64 through the resistor R47, and the voltage VOUT1 is grounded through the resistor R48.

[0011] Preferably, in the temperature sampling circuit, the power supply VCC is connected in series with the resistor R29 to the positive electrode of the diode D115. The negative electrode of the diode D115 is connected to the positive electrode of the diode D116, and the negative electrode of the diode D116 is grounded. The positive electrode of the diode D115 is led out as the sampling voltage V_D.

[0012] Preferably, in the signal processing circuit, it includes comparators U3.1, U3.2, and U3.3. The acquisition voltage V_D is connected to the negative input terminal of comparator U3.2 through resistor R441, the preset voltage is connected to the positive input terminal of comparator U3.2 through resistor R440, the output terminal of comparator U3.2 is connected to the positive input terminal of comparator U3.1 through resistor R18, the comparison voltage one greater than the preset voltage is connected to the negative input terminal of comparator U3.1, the output of comparator U3.1 is connected to the base of transistor Q2 through resistor R428, the emitter of transistor Q2 is led out as voltage V0, and the collector of transistor Q2 is connected to voltage V5;

[0013] The output terminal of comparator U3.2 is connected to the positive input terminal of comparator U3.3 through resistor R437, the comparison voltage two greater than the preset voltage is connected to the negative input terminal of comparator U3.3, the output of comparator U3.3 is connected to the base of transistor Q1 through resistor R434, the emitter of transistor Q1 is led out as voltage VOUT1, and the collector of transistor Q1 is connected to voltage V5.

[0014] Preferably, in the signal processing circuit, it further includes adjustable resistor W98. One end of adjustable resistor W98 is connected to ground through series resistor R432, the other end of adjustable resistor W98 is connected to voltage V5 through series resistor R431, the adjustable end of adjustable resistor W98 is connected to the negative input terminal of comparator U3.1, and the adjustable end of adjustable resistor W98 is connected to ground through series capacitor C42;

[0015] Preferably, in the signal processing circuit, it further includes adjustable resistor W99. One end of adjustable resistor W99 is connected to ground through series resistor R436, the other end of adjustable resistor W99 is connected to voltage V5 through series resistor R435, the adjustable end of adjustable resistor W99 is connected to the negative input terminal of comparator U3.3, and the adjustable end of adjustable resistor W99 is connected to ground through series capacitor C44.

[0016] Preferably, the constant temperature device for making the actuator applicable to low temperature environment further includes a redundant circuit. The redundant circuit includes a second temperature sampling circuit, a second signal processing circuit, and a second output circuit. The second temperature sampling circuit acquires the temperature of the environment where the actuator is located and outputs the acquisition voltage V_D2. The acquisition voltage V_D2 serves as the input voltage of the second signal processing circuit. The output voltage of the second signal processing circuit includes voltage VOUT2; when the acquisition voltage V_D2 is greater than the preset voltage, the voltage value of voltage VOUT2 is 0; when the acquisition voltage V_D2 is less than the preset voltage, the voltage value of voltage VOUT2 is greater than 0;

[0017] The second output circuit includes a relay K66. When the relay K66 is added, the 3rd and 6th feet of the normally closed point of the relay K65 are disconnected from the B terminal of the external power supply, and the 3rd and 6th feet of the normally closed point of the relay K65 are connected to the 2nd and 7th feet of the common point of the relay K66. The 3rd and 6th feet of the normally closed point of the relay K66 are respectively connected to the B terminal of the external power supply.

[0018] Preferably, in the second output circuit, the voltage VOUT2 is connected to the base of the triode Q8 through the resistor R49. The emitter of the triode Q8 is grounded, and the collector of the triode Q8 is connected to the collector of the triode Q65, the positive terminal of the diode D112, and one end of the coil of the relay K66. The negative terminal of the diode D112 and the other end of the coil of the relay K66 are connected to the voltage V8. The emitter of the triode Q65 is grounded. The voltage VOUT2 is connected to the base of the triode Q65 through the resistor R50, and the voltage VOUT2 is grounded through the resistor R51.

[0019] Preferably, in the second signal processing circuit, the sampled voltage V_D2 is connected to the negative input terminal of the comparator U4.2 through the resistor R426. The preset voltage is connected to the positive input terminal of the comparator U4.2 through the resistor R425. The output terminal of the comparator U4.2 is connected to the positive input terminal of the comparator U4.3 through the resistor R32. The comparison voltage three greater than the preset voltage is connected to the negative input terminal of the comparator U4.3. The output terminal of the comparator U4.3 is connected to the base of the triode Q63 through the resistor R36. The emitter of the triode Q63 is led out as the voltage VOUT2, and the collector of the triode Q63 is connected to the voltage V7.

[0020] Preferably, in the second signal processing circuit, it further includes a variable resistor W97. One end of the variable resistor W97 is connected to the ground after being connected in series with the resistor R35. The other end of the variable resistor W97 is connected to the voltage V7 after being connected in series with the resistor R34. The adjustable end of the variable resistor W97 is connected to the negative input terminal of the comparator U4.3, and the adjustable end of the variable resistor W97 is connected to the ground after being connected in series with the capacitor C43.

[0021] The beneficial effects of the present invention are as follows: The present invention realizes that when the temperature is too low, the heating element inside the actuator heats up, and the main board and supporting modules do not work. When the temperature inside the actuator heats up to the working range, the heating element stops heating and the main board works. Adding a constant temperature device of the present invention to the actuator enables the actuator to only heat at low temperatures. When the temperature inside the actuator reaches the working range of the components, heating stops, realizing automatic constant temperature, and preventing the actuator from heating at normal temperature or overheating, resulting in too high a temperature of the actuator and affecting the use of the actuator. Description of the Drawings

[0022] Figure 1 is the circuit schematic diagram of an embodiment of the temperature sampling circuit of the constant temperature device of the present invention;

[0023] Figure 2 It is the circuit schematic diagram of an embodiment of the signal processing circuit of the constant temperature device of the present invention;

[0024] Figure 3 It is the circuit schematic diagram of the first embodiment of the output circuit of the constant temperature device of the present invention;

[0025] Figure 4 It is the circuit schematic diagram of the second embodiment of the constant temperature device of the present invention;

[0026] Figure 5 It is the temperature data table of each component at each temperature environment when the actuator works after installing the constant temperature device of the present invention;

[0027] Figure 6 It is the temperature curve graph of each component at each temperature environment when the actuator works after installing the constant temperature device of the present invention. Specific embodiments

[0028] Now, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0029] As Figures 1 - 3 shown, a constant temperature device for making an actuator suitable for a low-temperature environment includes a temperature sampling circuit, a signal processing circuit, and an output circuit.

[0030] Specifically, in an optional embodiment, the temperature sampling circuit collects the temperature of the environment where the actuator is located and outputs a collected voltage V_D, and the collected voltage V_D serves as the input voltage of the signal processing circuit. As Figure 1 shown, an implementation circuit of a temperature sampling circuit. In the temperature sampling circuit, the power supply VCC is connected in series with the resistor R29 to the positive electrode of the diode D115, the negative electrode of the diode D115 is connected to the positive electrode of the diode D116, the negative electrode of the diode D116 is grounded, and the positive electrode of the diode D115 is led out as the collected voltage V_D. In this temperature sampling circuit, the temperature drift characteristic of the PN junction in the diode is used for temperature collection. When the PN junction is at a low temperature, the electron flow rate slows down, resulting in the widening of the PN junction, causing the collected voltage V_D to increase as the temperature decreases.

[0031] Specifically, in an optional embodiment, as Figure 2 shown, an implementation circuit of a signal processing circuit. The output voltage of the signal processing circuit includes the voltage V0 and the voltage VOUT1; when the collected voltage V_D is greater than the preset voltage, the voltage values of the voltage V0 and the voltage VOUT1 are 0; when the collected voltage V_D is less than the preset voltage, the voltage values of the voltage V0 and the voltage VOUT1 are greater than 0.

[0032] AsFigure 2 As shown, in the signal processing circuit, it includes comparators U3.1, U3.2, and U3.3. The acquisition voltage V_D is connected to the negative input terminal of comparator U3.2 through resistor R441, the preset voltage is connected to the positive input terminal of comparator U3.2 through resistor R440, the output terminal of comparator U3.2 is connected to the positive input terminal of comparator U3.1 through resistor R18, the comparison voltage one greater than the preset voltage is connected to the negative input terminal of comparator U3.1, the output of comparator U3.1 is connected to the base of transistor Q2 through resistor R428, the emitter of transistor Q2 is led out as voltage V0, and the collector of transistor Q2 is connected to voltage V5;

[0033] The output terminal of comparator U3.2 is connected to the positive input terminal of comparator U3.3 through resistor R437, the comparison voltage two greater than the preset voltage is connected to the negative input terminal of comparator U3.3, the output of comparator U3.3 is connected to the base of transistor Q1 through resistor R434, the emitter of transistor Q1 is led out as voltage VOUT1, and the collector of transistor Q1 is connected to voltage V5.

[0034] As Figure 2 shown, the signal processing circuit further includes an adjustable resistor W98. One end of the adjustable resistor W98 is connected to the ground after being connected in series with resistor R432, the other end of the adjustable resistor W98 is connected to voltage V5 after being connected in series with resistor R431, the adjustable end of the adjustable resistor W98 is connected to the negative input terminal of comparator U3.1, and the adjustable end of the adjustable resistor W98 is connected to the ground in series with capacitor C42. By adjusting the adjustable resistor W98, the voltage value of the comparison voltage one can be adjusted to achieve comparison of different voltage ranges.

[0035] As Figure 2 shown, the signal processing circuit further includes an adjustable resistor W99. One end of the adjustable resistor W99 is connected to the ground after being connected in series with resistor R436, the other end of the adjustable resistor W99 is connected to voltage V5 after being connected in series with resistor R435, the adjustable end of the adjustable resistor W99 is connected to the negative input terminal of comparator U3.3, and the adjustable end of the adjustable resistor W99 is connected to the ground in series with capacitor C44. By adjusting the adjustable resistor W99, the voltage value of the comparison voltage two can be adjusted to achieve comparison of different voltage ranges.

[0036] In practical requirements, when the temperature of the actuator is lower than -20°C, the constant temperature device needs to heat up; and in the experiment, it is known that when the temperature is -20°C, the PN junction voltage in the diode is 1.666V. Therefore, the collected voltage V_D is compared with 1.666V. When V_D > 1.666V (temperature lower than -20°C), V1 outputs 0V. At this time, V2 = 0V, V3 = 0V, V0 and VOUT1 are 0V, and no voltage is output; when V_D < 1.666V (temperature higher than -20°C), V1 outputs 5V. At this time, V2 = 5V, V3 = 5V, and V0 and VOUT1 output 5V; since the comparison voltages of V0 and VOUT1 are different, different threshold ranges can be achieved.

[0037] As Figure 3 shown, an implementation circuit one of an output circuit, the output circuit includes relay K64 and relay K65. The 8th and 1st feet of the normally open point of relay K64 are respectively connected to the A and B ends of the external power supply ( Figure 3 380VAC-A and 380VAC-B in Figure 3 ), and the 7th and 2nd feet of the common point of relay K64 are respectively connected to both ends of the power supply of the main board of the actuator (

[0038] 380VAC-A1 and 380VAC-B1 in

[0039] ); The normally closed points of the 3rd and 6th feet of relay K65 are respectively connected to the B end of the external power supply. The 7th and 2nd feet of the common point of relay K65 are both connected to one end of the power supply port of the heating element, and the other end of the power supply port of the heating element is connected to the A end of the external power supply.

[0040] Figure 3 Specifically, in an optional implementation manner, a constant temperature device for making the actuator suitable for low-temperature environments includes 3 heating elements. The 7th and 2nd feet of the common point of relay K65 are both connected to one end of the power supply ports of the three heating elements, and the other ends of the power supply ports of the three heating elements are all connected to the A end of the external power supply; The heating elements are installed inside the actuator housing. As

[0041] Figure 3 As Figure 3As shown, when V0 = 0V and VOUT1 = 0V, K64 and K65 do not act. At this time, pin 2 and pin 3 of relay K65 are connected, and pin 7 and pin 6 are connected. 380VAC - A and 380VAC - B (the A terminal and B terminal of the external power supply) are respectively connected to the power supply ports of the heating element. JH1, JH2, and JH3 output voltage to heat the heating element. And pin 2 and pin 3 of relay K64 are connected, and pin 7 and pin 6 are connected. 380VAC - A1 and 380VAC - B1 are disconnected from 380VAC - A and 380VAC - B. Therefore, the main board has no voltage and does not work.

[0042] When V0 = 5V and VOUT1 = 5V, relays K64 and K65 act. At this time, pin 2 and pin 1 of relay K65 are connected, and pin 7 and pin 8 are connected. 380VAC - A and 380VAC - B are respectively disconnected from the power supply ports of the heating element. JH1, JH2, and JH3 do not output voltage, and the heating element does not heat. And pin 2 and pin 1 of relay K64 are connected, and pin 7 and pin 8 are connected. 380VAC - A and 380VAC - B are respectively connected to 380VAC - A1 and 380VAC - B1, enabling the main board to have voltage and the main board to work; The present invention realizes that when the temperature is too low, the heating element inside the actuator heats up, and the main board and supporting modules do not work. When the temperature inside the actuator heats up to the working range, the heating element stops heating and the main board works.

[0043] As Figure 5 shown is the temperature data table of each component of the actuator working in each temperature environment after installing the constant temperature device of the present invention. Figure 6 shown is the curve graph of each component of the actuator working in each temperature environment after installing the constant temperature device of the present invention. It includes the temperature of the AC power supply, the temperature of the encoder in the actuator, the temperature of the main board in the actuator, the temperature of the display connected to the main board of the actuator, and the temperature of the heating element installed in the box of the actuator. Figure 6 The curve characteristics in show that when the actuator is at a low temperature of - 60° and not powered on, at this time, all important components of the actuator, including the drive component - AC contactor, valve position acquisition - encoder, main board, and display, are in a non - working state. When the actuator is powered on, at this time, the temperature control board installed in the actuator, that is, the constant temperature device of the present invention, starts to work, the heating element starts to heat, and the temperatures of all components start to rise. When heated to the set temperature (working temperature), at this time, the actuator can act. When the temperature is higher than the set upper limit, the temperature control board does not work, the box does not heat, and the temperatures of all components decrease. When the temperature is lower than the set lower limit, the temperature board starts to work, the box heats, and the temperatures of all components rise, maintaining a dynamic balance all the time; At this time, the temperature curve graphs of all components present an alternating current curve.

[0044] Add a constant temperature device of the present invention to the actuator, so that the actuator only heats at low temperatures such as -20°C, -10°C or -30°C. When the internal temperature of the actuator reaches the operating range of the components, the heating stops to achieve automatic constant temperature and prevent the actuator from heating at normal temperature or overheating, which may cause the temperature of the actuator to be too high and affect its use.

[0045] Specifically, in an optional implementation, in the output circuit, voltage V0 is connected to the base of transistor Q66, the emitter of transistor Q66 is grounded, and the collector of transistor Q66 is connected to the collector of transistor Q5, the positive terminal of diode D110, and one end of the coil of relay K64. The negative terminal of diode D110 and the other end of the coil of relay K64 are connected to voltage V6; the emitter of transistor Q5 is grounded, voltage V0 is connected to the base of transistor Q5 through resistors R52 and R53, and voltage V0 is grounded through resistors R52 and R54.

[0046] In the output circuit, voltage VOUT1 is connected to the base of transistor Q6 through resistor R46, the emitter of transistor Q6 is grounded, and the collector of transistor Q6 is connected to the collector of transistor Q64, the positive terminal of diode D111, and one end of the coil of relay K65. The negative terminal of diode D111 and the other end of the coil of relay K65 are connected to voltage V6; the emitter of transistor Q64 is grounded, voltage VOUT1 is connected to the base of transistor Q64 through resistor R47, and voltage VOUT1 is grounded through resistor R48.

[0047] As Figure 4 shown, Embodiment 2 of the constant temperature device includes Embodiment Circuit 1 of the output circuit and also includes a redundant circuit. The redundant circuit includes a second temperature sampling circuit, a second signal processing circuit, and a second output circuit. The second temperature sampling circuit collects the temperature of the environment where the actuator is located and outputs a sampled voltage V_D2. The sampled voltage V_D2 serves as the input voltage of the second signal processing circuit. The output voltage of the second signal processing circuit includes voltage VOUT2; when the sampled voltage V_D2 is greater than a preset voltage, the voltage value of voltage VOUT2 is 0; when the sampled voltage V_D2 is less than the preset voltage, the voltage value of voltage VOUT2 is greater than 0.

[0048] The second output circuit includes relay K66. When relay K66 is added, the 3rd and 6th feet of the normally closed point of relay K65 are disconnected from the B terminal of the external power supply. The 3rd and 6th feet of the normally closed point of relay K65 are connected to the 2nd and 7th feet of the common point of relay K66. The 3rd and 6th feet of the normally closed point of relay K66 are respectively connected to the B terminal of the external power supply.

[0049] Specifically, in an alternative embodiment, in the second output circuit, the voltage VOUT2 is connected to the base of the triode Q8 via the resistor R49. The emitter of the triode Q8 is grounded, and the collector of the triode Q8 is connected to the collector of the triode Q65, the positive terminal of the diode D112, and one end of the coil of the relay K66. The negative terminal of the diode D112 and the other end of the coil of the relay K66 are connected to the voltage V8. The emitter of the triode Q65 is grounded. The voltage VOUT2 is connected to the base of the triode Q65 via the resistor R50, and the voltage VOUT2 is grounded via the resistor R51.

[0050] Specifically, in the second signal processing circuit, the sampled voltage V_D2 is connected to the negative input terminal of the comparator U4.2 via the resistor R426. The preset voltage is connected to the positive input terminal of the comparator U4.2 via the resistor R425. The output terminal of the comparator U4.2 is connected to the positive input terminal of the comparator U4.3 via the resistor R32. The comparison voltage three greater than the preset voltage is connected to the negative input terminal of the comparator U4.3. The output terminal of the comparator U4.3 is connected to the base of the triode Q63 via the resistor R36. The emitter of the triode Q63 is led out as the voltage VOUT2, and the collector of the triode Q63 is connected to the voltage V7.

[0051] Specifically, in the second signal processing circuit, there is also an adjustable resistor W97. One end of the adjustable resistor W97 is grounded after being connected in series with the resistor R35. The other end of the adjustable resistor W97 is connected to the voltage V7 after being connected in series with the resistor R34. The adjustable end of the adjustable resistor W97 is connected to the negative input terminal of the comparator U4.3. The adjustable end of the adjustable resistor W97 is grounded after being connected in series with the capacitor C43. By adjusting the adjustable resistor W99, the voltage value of the comparison voltage three can be adjusted.

[0052] To prevent device damage during use, a redundant circuit is added to the output circuit of this device. The output circuit of the first embodiment of the constant temperature device serves as the main circuit. One temperature sampling circuit, one signal processing circuit, and one output circuit are added to the redundant circuit. The second temperature sampling circuit and the second signal processing circuit operate in the same way as the temperature sampling circuit and the signal processing circuit of the first embodiment of the constant temperature device. When the devices in the main circuit are damaged and cannot work, while the redundant circuit works normally, the redundant circuit replaces the main circuit to achieve the original functions.

[0053] What is described in the above specification is only the specific implementation manners of the present invention. Various examples do not constitute limitations on the essence of the present invention. Those of ordinary skill in the technical field can modify or deform the above-described specific implementation manners after reading the specification without departing from the essence and scope of the invention.

Claims

1. A thermostatic device for making an actuator suitable for low temperature environments, characterized in that: It includes a temperature sampling circuit, a signal processing circuit, and an output circuit. The temperature sampling circuit collects the temperature of the environment in which the actuator is located and outputs a collection voltage V_D. The collection voltage V_D is used as the input voltage of the signal processing circuit. The output voltage of the signal processing circuit includes a voltage V0 and a voltage VOUT1. When the collection voltage V_D is greater than a preset voltage, the voltage values ​​of the voltage V0 and the voltage VOUT1 are 0; when the collection voltage V_D is less than the preset voltage, the voltage values ​​of the voltage V0 and the voltage VOUT1 are greater than 0. The output circuit includes relay K64 and relay K65. Pin 8 and pin 1 of the normally open point of relay K64 are connected to the A terminal and the B terminal of the external power supply respectively. Pin 7 and pin 2 of the common point of relay K64 are connected to the two ends of the power supply of the mainboard of the actuator respectively. The 3rd and 6th pins of the normally closed point of the relay K65 are connected to the B terminal of the external power supply respectively, the 7th and 2nd pins of the common point of the relay K65 are connected to one end of the power supply port of the heating plate, and the other end of the power supply port of the heating plate is connected to the A terminal of the external power supply; The voltage V0 and the voltage VOUT1 serve as input voltages of the output circuit. When the voltage values ​​of the voltage V0 and the voltage VOUT1 are 0, the relay K64 and the relay K65 do not operate, and the A and B ends of the external power supply are respectively connected to the two ends of the power supply port of the heating plate; when the voltage values ​​of the voltage V0 and the voltage VOUT1 are greater than 0, the relay K64 and the relay K65 operate, and the A and B ends of the external power supply are respectively connected to the two ends of the power supply of the actuator's mainboard.

2. A thermostatic device for making an actuator suitable for low temperature environments according to claim 1, characterized in that: It includes three heating plates, the 7th and 2nd pins of the common point of the relay K65 are connected to one end of the power supply port of the three heating plates, and the other ends of the power supply ports of the three heating plates are connected to the external power supply A terminal; the heating plates are installed in the box of the actuator.

3. The constant temperature device for making the actuator suitable for low temperature environment according to claim 1, characterized in that: In the output circuit, the voltage V0 is connected to the base of the transistor Q66, the emitter of the transistor Q66 is grounded, the collector of the transistor Q66 is connected to the collector of the transistor Q5, the positive end of the diode D110 and one end of the coil of the relay K64, and the negative end of the diode D110 and the other end of the coil of the relay K64 are connected to the voltage V6; the emitter of the transistor Q5 is grounded, the voltage V0 is connected to the base of the transistor Q5 via the resistors R52 and R53, and the voltage V0 is grounded via the resistors R52 and R54. In the output circuit, the voltage VOUT1 is connected to the base of the transistor Q6 via the resistor R46, the emitter of the transistor Q6 is grounded, the collector of the transistor Q6 is connected to the collector of the transistor Q64, the positive end of the diode D111 and one end of the coil of the relay K65, and the negative end of the diode D111 and the other end of the coil of the relay K65 are connected to the voltage V6; the emitter of the transistor Q64 is grounded, the voltage VOUT1 is connected to the base of the transistor Q64 via the resistor R47, and the voltage VOUT1 is grounded via the resistor R48.

4. The thermostatic device for making the actuator suitable for low temperature environment according to claim 1, characterized in that: In the temperature sampling circuit, the power supply VCC is connected in series with the resistor R29 to the positive electrode of the diode D115, the negative electrode of the diode D115 is connected to the positive electrode of the diode D116, the negative electrode of the diode D116 is grounded, and the positive electrode of the diode D115 is led out as the sampling voltage V_D.

5. The constant temperature device for making the actuator suitable for low temperature environment according to claim 1, characterized in that: In the signal processing circuit, including comparators U3.1, U3.2, and U3.3, the collected voltage V_D is connected to the negative input terminal of the comparator U3.2 through the resistor R441, the preset voltage is connected to the positive input terminal of the comparator U3.2 through the resistor R440, the output terminal of the comparator U3.2 is connected to the positive input terminal of the comparator U3.1 through the resistor R18, the comparison voltage greater than the preset voltage is connected to the negative input terminal of the comparator U3.1, the output of the comparator U3.1 is connected to the base of the transistor Q2 through the resistor R428, the emitter of the transistor Q2 is led out as the voltage V0, and the collector of the transistor Q2 is connected to the voltage V5; The output end of comparator U3.2 is connected to the positive input end of comparator U3.3 via resistor R437, and the comparison voltage second which is greater than the preset voltage is connected to the negative input end of comparator U3.

3. The output of comparator U3.3 is connected to the base of transistor Q1 via resistor R434, and the emitter of transistor Q1 is led out as voltage VOUT1, and the collector of transistor Q1 is connected to voltage V5.

6. A thermostatic device for making an actuator suitable for low temperature environments according to claim 5, characterized in that: It also includes an adjustable resistor W98, one end of the adjustable resistor W98 is connected in series with a resistor R432 and then grounded, the other end of the adjustable resistor W98 is connected in series with a resistor R431 and then connected to a voltage V5, the adjustable end of the adjustable resistor W98 is connected to the negative input end of the comparator U3.1, and the adjustable end of the adjustable resistor W98 is connected in series with a capacitor C42 and then grounded; It also includes an adjustable resistor W99, one end of which is connected in series with a resistor R436 and then grounded, the other end of which is connected in series with a resistor R435 and then connected to a voltage V5, the adjustable end of the adjustable resistor W99 is connected to the negative input end of the comparator U3.3, and the adjustable end of the adjustable resistor W99 is connected in series with a capacitor C44 and then grounded.

7. The thermostatic device for making the actuator suitable for low temperature environment according to claim 1, characterized in that: It also includes a redundant circuit, which includes a second temperature sampling circuit, a second signal processing circuit and a second output circuit. The second temperature sampling circuit collects the temperature of the environment in which the actuator is located and outputs a collection voltage V_D2. The collection voltage V_D2 is used as the input voltage of the second signal processing circuit. The output voltage of the second signal processing circuit includes a voltage VOUT2. When the collection voltage V_D2 is greater than a preset voltage, the voltage value of the voltage VOUT2 is 0; when the collection voltage V_D2 is less than the preset voltage, the voltage value of the voltage VOUT2 is greater than 0. The second output circuit includes a relay K66. When the relay K66 is added, the 3rd and 6th pins of the normally closed point of the relay K65 are disconnected from the B terminal of the external power supply, the 3rd and 6th pins of the normally closed point of the relay K65 are connected to the 2nd and 7th pins of the common point of the relay K66, and the 3rd and 6th pins of the normally closed point of the relay K66 are respectively connected to the B terminal of the external power supply.

8. The thermostatic device for making the actuator suitable for low temperature environment according to claim 7, characterized in that: In the second output circuit, the voltage VOUT2 is connected to the base of the transistor Q8 via the resistor R49, the emitter of the transistor Q8 is grounded, the collector of the transistor Q8 is connected to the collector of the transistor Q65, the positive end of the diode D112 and one end of the coil of the relay K66, and the negative end of the diode D112 and the other end of the coil of the relay K66 are connected to the voltage V8; the emitter of the transistor Q65 is grounded, the voltage VOUT2 is connected to the base of the transistor Q65 via the resistor R50, and the voltage VOUT2 is grounded via the resistor R51.

9. The thermostatic device for making the actuator suitable for low temperature environment according to claim 7, characterized in that: In the second signal processing circuit, the collection voltage V_D2 is connected to the negative input terminal of the comparator U4.2 through the resistor R426, the preset voltage is connected to the positive input terminal of the comparator U4.2 through the resistor R425, the output terminal of the comparator U4.2 is connected to the positive input terminal of the comparator U4.3 through the resistor R32, the comparison voltage greater than the preset voltage is connected to the negative input terminal of the comparator U4.3, the output terminal of the comparator U4.3 is connected to the base of the transistor Q63 through the resistor R36, the emitter of the transistor Q63 is led out as the voltage VOUT2, and the collector of the transistor Q63 is connected to the voltage V7.

10. The thermostatic device for making the actuator suitable for low temperature environment according to claim 7, characterized in that: It also includes an adjustable resistor W97, one end of which is connected in series with a resistor R35 and then grounded, the other end of which is connected in series with a resistor R34 and then connected to a voltage V7, the adjustable end of the adjustable resistor W97 is connected to the negative input end of the comparator U4.3, and the adjustable end of the adjustable resistor W97 is connected in series with a capacitor C43 and then grounded.

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