Charging gun anti-freezing device in alpine region

Abstract

The invention discloses an anti-freezing device for a charging gun in an alpine region, and relates to the technical field of charging guns. The device comprises a plug, an end panel and a handle, wherein the plug is connected with a power receiving end through a buckle. According to the device, heating pieces are embedded in an unlocking button and a buckle movable plate, and freezing prevention is achieved through a thermistor and a force sensitive resistor. When low-temperature freezing occurs, the unlocking button is pressed to trigger the heating piece to melt ice, and smooth plugging and unplugging are ensured; and after the temperature recovers, the thermistor is automatically powered off to avoid energy waste. And the double force-sensitive resistors detect freezing and non-freezing states, so that the stability is enhanced. Electromagnet auxiliary unlocking is combined with mechanical transmission, and the flexibility is improved. The reset tension spring and the limiting protruding block ensure that the structure is durable. The device effectively solves the problem that the charging gun is frozen in the high and cold environment, and improves the use reliability and operation convenience.

Description

Technical Field

[0001] The present invention relates to the technical field of charging guns, and specifically to an anti-freezing device for charging guns in alpine regions. Background Art

[0002] In alpine regions, as an important connecting component of electric equipment, the charging gun faces the problem of water condensing into ice in a low-temperature environment. The existing charging gun designs usually only include basic plug-and-unplug structures, such as simple plugs and snap mechanisms, and the connection and separation with the power receiving end are achieved by manually pressing a button or pulling a lever. However, this design has significant defects in a cold environment. First, when the ambient temperature is lower than the condensation point, the moisture in the air will freeze at the plug or the unlocking button, resulting in the button being unable to be pressed or the snap being unable to disengage, making it difficult for the user to pull out the charging gun. Second, the existing technology lacks effective anti-freezing measures and usually relies on external heating devices or manual de-icing, which is cumbersome and inefficient. These drawbacks are particularly prominent in alpine environments, restricting the practicability and reliability of the charging gun. Summary of the Invention

[0003] To overcome the defects of the above-mentioned prior art, the present invention provides the following technical solution: An anti-freezing device for a charging gun in alpine regions, including a plug, the plug is fixedly installed on an end panel, rectangular through holes are opened on both the end panel and the plug, an electromagnet is fixedly installed in the rectangular through hole, two parallel snap sliding rods are fixedly installed on the side of the end panel away from the plug, a snap movable plate is slidably installed on the snap sliding rods, and the snap movable plate is also slidably arranged in the rectangular through hole, so that both ends of the snap movable plate are located on both sides of the plug and the end panel respectively. A snap is provided at one end of the snap movable plate facing the plug, and the snap is in snap-fit with the power receiving end; the end panel is fixedly installed on a mechanism box, the mechanism box is fixedly installed on a handle, a cable is arranged inside the handle, one end of the cable is in conductive cooperation with the plug, an unlocking button is slidably embedded and installed on the circumferential surface of the mechanism box along its radial direction, and the unlocking button is in transmission cooperation with the snap movable plate; a second heating sheet and a first heating sheet are respectively embedded and installed inside the snap movable plate and the unlocking button, and a first force-sensitive resistor is arranged on the side of the unlocking button located outside the mechanism box for measuring the force of pressing the unlocking button; a thermistor is also embedded in the unlocking button or the snap movable plate.

[0004] Preferably, the bottom ends of the two snap sliding rods are fixedly connected to the end panel through a snap sliding rod bracket, and a return spring is wound around each snap sliding rod, and both ends of the return spring are fixedly connected to the snap movable plate and the snap sliding rod bracket.

[0005] Preferably, two symmetrically arranged swing frame brackets are fixedly mounted on the buckle slide rod bracket, a swing frame is movably connected between the two swing frame brackets, a roller that contacts and rolls with the buckle movable plate is rotatably mounted on one end of the swing frame, and a slide rail groove is also provided on the swing frame, and a sliding pin rod is slidably mounted in the slide rail groove.

[0006] Preferably, a guide slide rod bracket is also fixedly mounted on the buckle slide rod bracket, two parallel guide slide rods are fixedly mounted on the guide slide rod bracket, and a toggle frame is slidably mounted on the two guide slide rods, wherein the sliding pin is fixedly mounted on the toggle frame.

[0007] Preferably, both guide slide rods are slidably sleeved with sliding sleeves, the bottom ends of the two sliding sleeves are fixedly matched with the toggle frame, and the top ends of the two sliding sleeves are fixedly matched with the unlocking button, wherein a limiting protrusion is fixedly installed on the unlocking button, and the limiting protrusion is used to prevent the unlocking button from being separated from the mechanism box.

[0008] Preferably, an auxiliary support plate is fixedly installed on the inner wall of the mechanism box, the auxiliary support plate is arranged parallel to the unlocking button, an auxiliary guide slide rod parallel to the axis of the sliding sleeve is slidably installed on the auxiliary support plate, a spring is arranged around the auxiliary guide slide rod, one end of the spring is fixedly connected to the unlocking button, and the other end of the spring is fixedly connected to the lower pressure plate, and the auxiliary guide slide rod is fixedly matched with the unlocking button.

[0009] Preferably, the lower pressure plate is slidably sleeved on the outer surface of the auxiliary guide slide rod, and a second force-sensitive resistor is provided between the opposite surfaces of the lower pressure plate and the auxiliary support plate, and the second force-sensitive resistor is used to detect the elastic force of the spring.

[0010] Preferably, it also includes a 3V DC power supply, a 5V DC power supply, and a 12V DC power supply; wherein a fixed resistor R3 and a second force-sensitive resistor are arranged in series in the 3V DC power supply, and an NPN transistor is arranged in parallel at both ends of the second force-sensitive resistor, the base of the NPN transistor is electrically connected to the positive terminal of the second force-sensitive resistor, the emitter is electrically connected to the negative terminal of the second force-sensitive resistor, and the collector and emitter of the NPN transistor are connected in series in the 5V DC power supply.

[0011] Preferably, the 5V DC power supply is also provided with a fixed resistor R1, a first force-sensitive resistor, a fixed resistor R2, and a positive temperature coefficient thermistor in series; another NPN transistor is provided in parallel at both ends of the fixed resistor R2, the base of the NPN transistor is electrically connected to the positive end of the fixed resistor R2, the emitter is electrically connected to the negative end of the fixed resistor R2, and the collector and emitter of the NPN transistor are connected in series in the 12V DC power supply.

[0012] Preferably, a relay is also connected in series in the 12V DC power supply. The open contacts of the relay are connected in series in the starting circuits of the first heating sheet and the second heating sheet to control the on-off of the first heating sheet and the second heating sheet.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) By embedding the first heating sheet and the second heating sheet in the unlocking button and the buckle movable plate and combining with the intelligent control circuit of the thermistor and the force-sensitive resistor, the present invention can quickly detect and melt the condensed ice in a low-temperature environment. When the ambient temperature is lower than the condensation point, the user presses the unlocking button to trigger the heating sheet to work, and the generated heat quickly thaws the frozen part, ensuring a smooth separation process between the charging gun plug and the power receiving end, avoiding the problem of being unable to pull out due to freezing, and thus significantly improving the reliability of the charging equipment in alpine regions; (2) The present invention is internally provided with a positive temperature coefficient thermistor, which is linked with the control circuit of the heating sheet. When the unlocking button and the buckle movable plate are heated to a certain temperature, the resistance value of the thermistor increases, causing the relay to disconnect and the heating sheet to stop working. This intelligent temperature control mechanism ensures that heating only occurs when necessary, avoiding energy waste caused by long-term heating; (3) Through the dual detection design of the first force-sensitive resistor and the second force-sensitive resistor, the device can respectively sense the pressing force when the unlocking button is frozen and the normal movement state when it is not frozen. When the unlocking button is frozen, the first force-sensitive resistor triggers heating; when it is not frozen, the second force-sensitive resistor detects through spring extrusion to ensure that the heating circuit does not start by mistake. This redundant design enhances the stability of the system and avoids misoperation or ineffective heating; (4) The present invention not only realizes the unlocking of the buckle through the mechanical transmission of the unlocking button, but also designs an electromagnet as an auxiliary unlocking means. At normal temperature, the magnetic force generated by the energized electromagnet can directly drive the movement of the buckle movable plate to complete the unlocking. This dual-mode design not only retains the intuitiveness of mechanical operation but also increases the efficiency of electromagnetic control, improving the operation flexibility and convenience of users in different scenarios; (5) The present invention adopts a combined design of a buckle slide rod and a reset tension spring to ensure that the buckle movable plate can automatically reset after unlocking, avoiding the buckle being in a disengaged state for a long time and affecting the next use. At the same time, the setting of the limit bump and the auxiliary guiding slide rod prevents the unlocking button from disengaging or shifting, ensuring the compactness of the structure and the overall durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 is Figure 1 a schematic diagram of the structure at A in

[0016] Figure 3 It is a schematic diagram of the handle structure of the present invention.

[0017] Figure 4 for Figure 3 Schematic diagram of the structure at point B in the middle.

[0018] Figure 5 It is a structural schematic diagram of the sliding sleeve of the present invention.

[0019] Figure 6 It is a schematic diagram of the structure of the swing frame of the present invention.

[0020] Figure 7 It is a schematic diagram of the structure of the snap-fit ​​movable plate of the present invention.

[0021] Figure 8 This is the start and stop control diagram of the heating plate of the present invention.

[0022] In the figure: 101-handle; 102-cable; 103-mechanism box; 104-plug; 105-clip; 106-unlock button; 107-end panel; 108-auxiliary support plate; 109-spring; 110-down pressure plate; 111-second force-sensitive resistor; 112-sliding sleeve; 113-limiting protrusion; 114-auxiliary guide slide; 115-first heating plate; 116-guide slide; 117-sliding frame; 118-clip slide bracket; 119-clip slide; 120-clip movable plate; 121-reset tension spring; 122-swing frame bracket; 123-guide slide bracket; 124-swing frame; 125-electromagnet; 126-sliding pin; 127-slide groove; 128-roller; 129-second heating plate; 130-rectangular through hole. DETAILED DESCRIPTION

[0023] The following is combined with Figures 1-8 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0024] The present invention provides an anti-freezing device for a charging gun in alpine regions, which includes a plug 104 fixedly installed on an end panel 107. Rectangular through holes 130 are provided on both the end panel 107 and the plug 104. An electromagnet 125 is fixedly installed in the rectangular through holes 130. On the side of the end panel 107 away from the plug 104, two parallel snap rod 119 are fixedly installed. A snap movable plate 120 is slidably installed on the snap rod 119. The snap movable plate 120 is also slidably arranged in the rectangular through hole 130, so that both ends of the snap movable plate 120 are located on both sides of the plug 104 and the end panel 107. A snap 105 is provided at one end of the snap movable plate 120 facing the plug 104, and the snap 105 is in snap-fit with the power receiving end; the end panel 107 is fixedly installed on a mechanism box 103, and the mechanism box 103 is fixedly installed on a handle 101. A cable 102 is arranged inside the handle 101. One end of the cable 102 is electrically conductive with the plug 104. An unlocking button 106 is slidably embedded and installed on the circumferential surface of the mechanism box 103 along its radial direction, and the unlocking button 106 is in transmission cooperation with the snap movable plate 120; a second heating sheet 129 and a first heating sheet 115 are respectively embedded in the snap movable plate 120 and the unlocking button 106. A first force-sensitive resistor is arranged on the side of the unlocking button 106 located outside the mechanism box 103 for measuring the pressing force of the unlocking button 106; a thermistor is also embedded in the unlocking button 106 or the snap movable plate 120. The bottom ends of the two snap rod 119 are fixedly connected to the end panel 107 through a snap rod bracket 118. A return spring 121 is arranged around each snap rod 119, and both ends of the return spring 121 are fixedly connected to the snap movable plate 120 and the snap rod bracket 118. Two symmetrically arranged swing frame brackets 122 are fixedly installed on the snap rod bracket 118. A swing frame 124 is movably connected between the two swing frame brackets 122. A roller 128 in contact and rolling cooperation with the snap movable plate 120 is rotatably installed at one end of the swing frame 124. A slide rail groove 127 is also provided on the swing frame 124, and a sliding pin rod 126 is slidably installed in the slide rail groove 127. A guide rod bracket 123 is also fixedly installed on the snap rod bracket 118. Two parallel guide rods 116 are fixedly installed on the guide rod bracket 123. A toggle frame 117 is slidably installed on the two guide rods 116, and the sliding pin rod 126 is fixedly installed on the toggle frame 117. Sliding sleeves 112 are slidably sleeved on the two guide rods 116. The bottom ends of the two sliding sleeves 112 are fixedly matched with the toggle frame 117, and the top ends of the two sliding sleeves 112 are fixedly matched with the unlocking button 106. A limit convex block 113 is fixedly installed on the unlocking button 106, and the limit convex block 113 is used to prevent the unlocking button 106 from separating from the mechanism box 103.An auxiliary support plate 108 is fixedly installed in the inner wall of the mechanism box 103 in an overhead manner. The auxiliary support plate 108 is arranged in parallel with the unlocking button 106. An auxiliary guiding slide bar 114 parallel to the axis of the sliding sleeve 112 is slidably installed on the auxiliary support plate 108. A spring 109 is wound around the auxiliary guiding slide bar 114. One end of the spring 109 is fixedly connected to the unlocking button 106, and the other end of the spring 109 is fixedly connected to a lower pressing plate 110. The auxiliary guiding slide bar 114 is fixedly matched with the unlocking button 106. The lower pressing plate 110 is slidably sleeved on the outer surface of the auxiliary guiding slide bar 114. A second force-sensitive resistor 111 is arranged between the opposite surfaces of the lower pressing plate 110 and the auxiliary support plate 108. The second force-sensitive resistor 111 is used to detect the elastic force of the spring 109.

[0025] It also includes a 3V DC power supply, a 5V DC power supply, and a 12V DC power supply. Among them, a fixed-value resistor R3 and a second force-sensitive resistor 111 are connected in series in the 3V DC power supply, and a NPN triode is connected in parallel at both ends of the second force-sensitive resistor 111. The base of the NPN triode is electrically connected to the positive terminal of the second force-sensitive resistor 111, the emitter is electrically connected to the negative terminal of the second force-sensitive resistor 111, and the collector and emitter of the NPN triode are connected in series in the 5V DC power supply. Among them, a fixed-value resistor R1, a first force-sensitive resistor, a fixed-value resistor R2, and a positive temperature coefficient thermistor are also connected in series in the 5V DC power supply. Among them, another NPN triode is connected in parallel at both ends of the fixed-value resistor R2. The base of the NPN triode is electrically connected to the positive terminal of the fixed-value resistor R2, the emitter is electrically connected to the negative terminal of the fixed-value resistor R2, and the collector and emitter of the NPN triode are connected in series in the 12V DC power supply. Among them, a relay is also connected in series in the 12V DC power supply. The open contacts of the relay are connected in series in the starting circuits of the first heating sheet 115 and the second heating sheet 129 to control the on-off of the first heating sheet 115 and the second heating sheet 129.

[0026] The working principle of the antifreeze device for a charging gun in a high-cold area disclosed by the present invention is as follows: when the ambient temperature is normal, the user presses the unlocking button 106 normally, and the unlocking button 106 will drive the sliding sleeve 112 to move together, and the sliding sleeve 112 will drive the toggle frame 117 to slide on the guide slide rod 116, and then the toggle frame 117 drives the swing frame 124 to swing on the swing frame bracket 122 through the sliding pin 126 (the sliding pin 126 will also slide in the slide rail groove 127), and the roller 128 on the swing frame 124 will roll between the buckle movable plate 120, driving the buckle movable plate 120 to move toward the direction of the electromagnet 125, at this time, the buckle movable plate 120 will slide on the buckle slide rod 119, and make the reset tension spring 121 in a stretched state, this process separates the buckle 105 from the buckle port of the power receiving end, and pulls out the plug 104 from the power receiving end or the charging pile (if the charging pile has the same buckle port design as the power receiving end). When the ambient temperature decreases, the moisture in the air will condense on the electromagnet 125 and the unlock button 106. At this time, when the user presses the unlock button 106, it may not be pressed (the unlock button 106 is frozen together with the mechanism box 103). When the user presses the unlock button 106, the resistance of the first force-sensitive resistor on the unlock button 106 will decrease, which will cause the potential difference across the fixed resistor R2 to increase (the voltage across the fixed resistor R2 increases), making the potential difference across the fixed resistor R2 greater than 0.7V. At this time, there will be enough trigger voltage between the base and emitter of the NPN transistor connected in series in the 12V DC power supply, which will cause the control of the second heating plate 129 and the first heating plate 115 to start the relay to open the contact and attract. At this time, the second heating plate 129 and the first heating plate 115 start to work and generate heat. The condensed ice around the unlock button 106 and the buckle movable plate 120 melts. At the same time, the resistance of the thermistor is relatively high at normal temperature, which will lead to a relatively high potential difference across the thermistor. After the first force-sensitive resistor is pressed (pressing the unlock button 106), the potential difference across the fixed resistor R2 cannot reach 0.7V, that is, the above situation will only occur when the unlock button 106 is pressed when the ambient temperature (the actual temperature of the unlock button 106 and the buckle movable plate 120) is lower than the air condensation point. At the same time, since the thermistor is in contact with the unlock button 106, when the unlock button 106 is heated, the resistance of the thermistor will increase, resulting in a decrease in the potential difference across the fixed resistor R2. At this time, the collector and emitter of the NPN transistor connected in series to the 12V DC power supply are cut off, the open contacts of the corresponding relay are disconnected, the second heating plate 129 and the first heating plate 115 lose power, and the unlock button 106 and the buckle movable plate 120 are no longer heated.

[0027] When the ambient temperature is low, but the unlocking button 106 may still be pressed (not frozen), when the unlocking button 106 moves downward, the unlocking button 106 will drive the auxiliary guiding slide bar 114 to move together, and the spring 109 wound around the auxiliary guiding slide bar 114 will also move together. At this time, the spring 109 will squeeze the second force-sensitive resistor 111 through the lower pressing plate 110, resulting in a decrease in the resistance value of the second force-sensitive resistor 111. That is to say, only when the unlocking button 106 can be pressed and moved, the second force-sensitive resistor 111 will be squeezed by the spring 109 (the description of the spring 109 squeezing the second force-sensitive resistor 111 here refers to an increase in the squeezing force of the spring 109 on the second force-sensitive resistor 111. Because after the spring 109 receives the pressure from the unlocking button 106, the deformation amount of the spring 109 increases, its own elastic force also increases, and the squeezing force on the second force-sensitive resistor 111 also increases). The decrease in the resistance value of the second force-sensitive resistor 111 will cause the potential difference across its own ends to decrease. Therefore, the potential difference between the base and the emitter of the NPN transistor connected in series to the 5V DC power supply will be lower than 0.7V. At this time, the collector and the emitter of this NPN transistor are cut off, which will cause no current to pass through the circuit where the first force-sensitive resistor is located, and therefore it cannot take effect, directly resulting in the corresponding second heating sheet 129 and the first heating sheet 115 not being able to work (no work is required at this time). And here, the second force-sensitive resistor 111 can also make the normally open contact of the relay disconnect, which has the same function as the thermistor making the normally open contact of the relay disconnect, and can also play a redundant setting role.

[0028] In the normal temperature mode, the snap fastener movable plate 120 can also be driven to move by controlling the electromagnet 125. When the electromagnet 125 is energized, it will generate a magnetic force, and the magnetic force attracts the snap fastener movable plate 120 to move towards the electromagnet 125, and then drives the snap fastener 105 to move synchronously.

Claims

1. A charging gun antifreeze device for high-cold areas, characterized by: The invention comprises a plug (104), wherein the plug (104) is fixedly mounted on an end panel (107), wherein a rectangular through hole (130) is provided on both the end panel (107) and the plug (104), wherein an electromagnet (125) is fixedly mounted in the rectangular through hole (130), and two parallel buckle slide bars (119) are fixedly mounted on a side of the end panel (107) away from the plug (104), wherein a buckle movable plate (120) is slidably mounted on the buckle slide bars (119), wherein the buckle movable plate (120) is also slidably mounted in the rectangular through hole (130), so that two ends of the buckle movable plate (120) are respectively located on two sides of the plug (104) and the end panel (107), and a buckle (105) is provided on one end of the buckle movable plate (120) facing the plug (104), wherein the buckle (105) is buckled and matched with the power receiving end; The end panel (107) is fixedly mounted on the mechanism box (103), the mechanism box (103) is fixedly mounted on the handle (101), a cable (102) is arranged inside the handle (101), one end of the cable (102) is electrically conductively matched with the plug (104), an unlocking button (106) is embedded and mounted on the circumferential surface of the mechanism box (103) in a radially slidable manner, and the unlocking button (106) is transmission-matched with the buckle movable plate (120); A second heating plate (129) and a first heating plate (115) are respectively embedded and installed inside the buckle movable plate (120) and the unlocking button (106); a first force-sensitive resistor is provided on a surface of the unlocking button (106) located outside the mechanism box (103) for measuring the force of pressing the unlocking button (106); and a thermistor is also embedded in the unlocking button (106) or the buckle movable plate (120).

2. The antifreeze device for charging guns in high-cold areas according to claim 1 is characterized by: The bottom ends of the two buckle slide bars (119) are fixedly connected to the end panel (107) via the buckle slide bar bracket (118), and a return spring (121) is arranged around each buckle slide bar (119), and the two ends of the return spring (121) are fixedly connected to the buckle movable plate (120) and the buckle slide bar bracket (118).

3. The antifreeze device for charging guns in high-cold areas according to claim 2 is characterized by: Two symmetrically arranged swing frame brackets (122) are fixedly mounted on the buckle slide rod bracket (118); a swing frame (124) is movably connected between the two swing frame brackets (122); a roller (128) that contacts and rolls with the buckle movable plate (120) is rotatably mounted on one end of the swing frame (124); a slide rail groove (127) is also provided on the swing frame (124); a slide pin rod (126) is slidably mounted in the slide rail groove (127).

4. The antifreeze device for charging guns in high-cold areas according to claim 3 is characterized by: A guide slide rod bracket (123) is also fixedly mounted on the buckle slide rod bracket (118), two parallel guide slide rods (116) are fixedly mounted on the guide slide rod bracket (123), and a toggle frame (117) is slidably mounted on the two guide slide rods (116), wherein the sliding pin rod (126) is fixedly mounted on the toggle frame (117).

5. The antifreeze device for charging guns in high-cold areas according to claim 4 is characterized by: The two guide slide bars (116) are both slidably sleeved with a sliding sleeve (112), the bottom ends of the two sliding sleeves (112) are fixedly matched with the toggle frame (117), and the top ends of the two sliding sleeves (112) are fixedly matched with the unlocking button (106), wherein a limiting protrusion (113) is fixedly installed on the unlocking button (106), and the limiting protrusion (113) is used to prevent the unlocking button (106) from being separated from the mechanism box (103).

6. The antifreeze device for charging guns in high-cold areas according to claim 5, characterized in that: An auxiliary support plate (108) is fixedly installed on the inner wall of the mechanism box (103) in the air. The auxiliary support plate (108) is arranged parallel to the unlocking button (106). An auxiliary guide slide bar (114) parallel to the axis of the sliding sleeve (112) is slidably installed on the auxiliary support plate (108). A spring (109) is arranged around the auxiliary guide slide bar (114). One end of the spring (109) is fixedly connected to the unlocking button (106), and the other end of the spring (109) is fixedly connected to the lower pressure plate (110). The auxiliary guide slide bar (114) is fixedly matched with the unlocking button (106).

7. The antifreeze device for charging guns in high-cold areas according to claim 6, characterized in that: The lower pressing plate (110) is slidably sleeved on the outer surface of the auxiliary guide slide bar (114), and a second force-sensitive resistor (111) is arranged between the opposite surfaces of the lower pressing plate (110) and the auxiliary support plate (108), and the second force-sensitive resistor (111) is used to detect the elastic force of the spring (109).

8. The antifreeze device for charging guns in high-cold areas according to claim 7, characterized in that: It also includes a 3V DC power supply, a 5V DC power supply, and a 12V DC power supply; wherein a fixed resistor R3 and a second force-sensitive resistor (111) are arranged in series in the 3V DC power supply, and an NPN transistor is arranged in parallel at both ends of the second force-sensitive resistor (111), the base of the NPN transistor is electrically connected to the positive terminal of the second force-sensitive resistor (111), the emitter is electrically connected to the negative terminal of the second force-sensitive resistor (111), and the collector and emitter of the NPN transistor are connected in series in the 5V DC power supply.

9. The antifreeze device for charging guns in high-cold areas according to claim 8, characterized in that: The 5V DC power supply is also provided with a fixed resistor R1, a first force-sensitive resistor, a fixed resistor R2, and a positive temperature coefficient thermistor in series; another NPN transistor is provided in parallel at both ends of the fixed resistor R2, the base of the NPN transistor is electrically connected to the positive end of the fixed resistor R2, the emitter is electrically connected to the negative end of the fixed resistor R2, and the collector and emitter of the NPN transistor are connected in series in the 12V DC power supply.

10. The antifreeze device for charging guns in high-cold areas according to claim 9, characterized in that: A relay is also arranged in series in the 12V DC power supply, and the open contacts of the relay are connected in series in the start-up circuits of the first heating plate (115) and the second heating plate (129), so as to control the on and off of the first heating plate (115) and the second heating plate (129).

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