Liquid level sensor, radiator assembly and loader
Through the resistance circuit and guide rod structure of the liquid level sensor, the antifreeze liquid level of the loader water tank is automatically detected, solving the problems of complex and high cost of liquid level detection in the existing technology, and simplifying the liquid level detection and improving the operation stability are achieved. .
Patent Information
- Application Number
- CN202420445159.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-07
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-07
AI Technical Summary
In the prior art, the loader water tank level detection method and structure are complex and the detection cost is high, which leads to the controller failure or high motor temperature when the antifreeze liquid level of the cooling system does not meet the requirements, which can easily lead to a fault in the controller or a high motor temperature, affecting operation and production.
Design a liquid level sensor, including resistance circuit, guide rod, float ball and wire harness assembly, slide on the guide rod through float ball, induce liquid level changes, automatically detect antifreeze liquid level, and connect the vehicle circuit in series through resistors to detect The voltage changes, and an alarm prompts the addition of antifreeze, simplifying the detection structure and method.
The simplification and cost reduction of liquid level detection are achieved, controller failures and motor high temperature problems caused by liquid level neglect are avoided, and the stability and production efficiency of the working machinery are improved.
Smart Images
Figure CN222144269U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid level monitoring, in particular to a liquid level sensor, a radiator assembly and a loader. Background Art
[0002] At present, radiators play an important role in cooling and dissipating heat of loaders, and there is an irreplaceable demand for the stable operation of loaders. The layout of radiators for loaders is usually located on the side or tail of the rear frame, and are all on the inside of the hood, which makes it difficult to observe the antifreeze level in the water tank, and it is easy for people to ignore the antifreeze level of the vehicle. When the loader is operating, if the antifreeze in the cooling system does not reach the required level, the lack of liquid will easily cause the controller to report IGBT temperature failure or motor high temperature failure, causing the entire vehicle to lift or move slowly and weakly, and in severe cases even cause shutdown problems, affecting operation and production.
[0003] In the current prior art, multiple holes are opened on the side of the water tank, and liquid level switches are respectively inserted into three holes. The multiple liquid level switches are connected to indicator light signals, so that the liquid level in the water tank can be detected; however, such a method and structural design are relatively complicated, and there are many accessories, and the cost will increase accordingly.
[0004] Therefore, it is necessary to provide a liquid level sensor, a radiator assembly and a loader to solve the above technical problems. Utility Model Content
[0005] The main purpose of the utility model is to provide a liquid level sensor, a radiator assembly and a loader, aiming to solve the technical problems of the prior art that the water tank liquid level detection method and structure of the loader are complex and the detection cost is high.
[0006] According to one aspect of the utility model, the utility model provides a liquid level sensor for detecting the liquid level of a solution in a water tank in an operating machine, wherein the operating machine includes a vehicle circuit and a controller, and the liquid level sensor includes:
[0007] a resistance circuit, the resistance circuit comprising a normally open inductive switch and a resistor connected to each other;
[0008] A guide rod, wherein the normally open induction switch is arranged inside the guide rod;
[0009] A float, the float is slidably mounted on the guide rod, and the float can slide to the normally open induction switch to close the normally open induction switch;
[0010] A wiring harness assembly comprises a wiring harness plug-in and a wiring harness which are connected to each other. The wiring harness plug-in is used to be connected to the vehicle circuit of the loader, and the wiring harness is connected to the resistance circuit.
[0011] In one embodiment, a magnet is disposed on the top of the float, and the normally open induction switch includes a reed switch, which is disposed inside the guide rod.
[0012] In one embodiment, the guide rod is further provided with an upper limit switch and a lower limit switch, the upper limit switch is provided above the lower limit switch, and the float is located between the upper limit switch and the lower limit switch.
[0013] According to another aspect of the utility model, the utility model also provides a radiator assembly, including a water tank, a radiator and the liquid level sensor described above, the water tank is formed with a mounting hole and a accommodating cavity that are interconnected, the accommodating cavity is used to accommodate antifreeze, and the liquid level sensor is installed in the mounting hole and extends into the accommodating cavity.
[0014] In one embodiment, the guide rod includes a first connecting section, a second connecting section and a third connecting section connected in sequence, the float is slidably installed on the third connecting section, a groove is formed on the outer periphery of the second connecting section, the liquid level sensor also includes a sealing ring, the second connecting section is installed on the mounting hole, and the sealing ring abuts against the inner wall of the mounting hole.
[0015] In one embodiment, the mounting hole is formed with an internal thread, the second connecting section is formed with an external thread, and the second connecting section is threadably connected to the internal thread of the mounting hole via the external thread.
[0016] According to another aspect of the utility model, the utility model further provides a loader, characterized in that it includes a vehicle body and the above-mentioned radiator assembly.
[0017] In one embodiment, the vehicle body includes a controller and a vehicle circuit, and the controller is used to detect a voltage signal of the vehicle circuit.
[0018] In one embodiment, the vehicle body further includes a display screen, the controller is signal-connected to the display screen, and the display screen is used to display the voltage signal.
[0019] In one embodiment, the loader further comprises a warning light, wherein the warning light is electrically connected to the vehicle circuit, and the warning light is signal-connected to the controller.
[0020] In the above scheme, the liquid level sensor is used to detect the liquid level of the solution in the water tank of the operating machinery. The operating machinery includes a vehicle circuit and a controller. The liquid level sensor includes a resistance circuit, a guide rod, a float and a wiring harness assembly. The resistance circuit includes a normally open sensing switch and a resistor connected to each other; the guide rod is provided with a lower limit switch, and the normally open sensing switch is arranged inside the guide rod; the float is slidably installed on the guide rod, and the float can slide to the normally open sensing switch to close the normally open sensing switch; the wiring harness assembly includes a wiring harness plug-in and a wiring harness connected to each other, the wiring harness plug-in is used to connect to the vehicle circuit, and the wiring harness is connected to the resistance circuit to connect the resistance circuit in series to the vehicle circuit; the controller is used to detect the voltage signal of the vehicle circuit. Specifically, when it is necessary to detect the liquid level of antifreeze in the water tank of the operating machinery, the operator installs the liquid level sensor on the water tank and extends the guide rod and the float into the water tank. In this way, the float will be affected by buoyancy and its own gravity. Since the weight of the float itself is very light, the gravity is much smaller than the buoyancy. When the liquid level of the antifreeze exceeds the height of the normally open sensing switch, the float will rise to the top of the normally open sensing switch due to buoyancy. At this time, the normally open sensing switch remains in a normal state, that is, in an open state. At this time, the resistor connected in series with the normally open sensing switch is equivalent to being disconnected and is not connected in series to the entire vehicle circuit of the operating machinery. At this time, the entire vehicle circuit of the operating machinery is still at the original voltage value. During the use of the operating machinery, the antifreeze continuously flows into the radiator for heat dissipation. Therefore, the liquid level of the antifreeze will continue to drop. When the liquid level of the antifreeze drops, the float will follow and slide down on the guide rod until the float is in contact with the normally open sensing switch. The open sensing switch is at the same height. At this time, the normally open sensing switch senses the float, and the normally open sensing switch will be closed, so that the wiring harness will connect the resistor in series to the whole vehicle circuit of the operating machinery. At this time, the voltage value of the whole vehicle circuit of the operating machinery will drop significantly due to the series connection of the resistor, and the controller of the operating machinery will detect this change and issue an alarm to remind the operator to add antifreeze; after adding antifreeze, the float will rise with the rise of the liquid level, and the normally open sensing switch cannot sense the float, so that the normally open sensing switch will return to the open state, and the resistor will also become disconnected, that is, the resistor is no longer connected in series with the whole vehicle circuit of the operating machinery, and the voltage of the whole vehicle circuit of the operating machinery returns to the original voltage value; through such a setting, only one liquid level sensor is needed to detect the liquid level, which greatly reduces the detection cost. At the same time, there is no need to change the structure of the water tank, which greatly simplifies the structure and method of the detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0022] Figure 1 A partial cross-sectional view of a liquid level sensor according to an embodiment of the utility model;
[0023] Figure 2 This is a schematic diagram of the internal structure of a liquid level sensor according to an embodiment of the utility model;
[0024] Figure 3 This is a schematic diagram of the structure of a resistor circuit according to an embodiment of the utility model;
[0025] Figure 4 This is a schematic structural diagram of a radiator assembly according to an embodiment of the utility model;
[0026] Figure 5 The figure is a schematic diagram of the flow of liquid level detection according to an embodiment of the utility model.
[0027] Description of Figure Numbers:
[0028] Label name Label name 1 Resistor Circuit 11 Normally open sensor switch 12 resistance 2 Guide rod 21 Upper limit switch 22 Lower limit switch 23 First connection section 24 Second connecting section 25 The third connecting section 251 Grooves 3 Float 31 magnet 4 Wiring Harness Assemblies 41 Wiring harness plug-in 42 Wiring Harness 5 Sealing ring 100 Liquid level sensor 200 Radiator assembly 201 Water tank 202 heat sink 301 Controller 302 Vehicle circuit 303 Display
[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0032] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0035] According to one aspect of the utility model, see Figures 1 to 3 The utility model provides a liquid level sensor 100, which is used for detecting the liquid level of a solution in a water tank in an operating machine. The operating machine includes a vehicle circuit 302 and a controller 301. The liquid level sensor 100 includes:
[0036] A resistance circuit 1, the resistance circuit 1 comprises a normally open induction switch 11 and a resistor 12 connected to each other;
[0037] A guide rod 2, a normally open induction switch 11 is arranged inside the guide rod 2;
[0038] The float 3 is slidably mounted on the guide rod 2, and the float 3 can slide to the normally open induction switch 11 to close the normally open induction switch 11;
[0039] The wiring harness assembly 4 includes a wiring harness plug-in 41 and a wiring harness 42 which are interconnected. The wiring harness plug-in 41 is used to connect to the vehicle circuit 302, and the wiring harness 42 is connected to the resistance circuit 1, so as to connect the resistance circuit 1 in series to the vehicle circuit 302. The controller 301 is used to detect the voltage signal of the vehicle circuit 302. When the float slides to the normally open sensing switch 11, the normally open sensing switch 11 is closed, so that the resistance circuit 1 is connected in series to the vehicle circuit 302. After the resistance circuit 1 is connected in series to the vehicle circuit 302, the controller 301 detects the voltage change signal. If the voltage change signal differs greatly from the preset value, the operator is reminded to add antifreeze. Specifically, when it is necessary to detect the liquid level of the antifreeze in the water tank 201 in the operating machinery, the operator installs the liquid level sensor 100 on the water tank 201, and extends the guide rod 2 and the float 3 into the water tank 201, so that the float 3 is affected by the buoyancy and self- The influence of body gravity, since the weight of the float 3 itself is very light, the gravity is much smaller than the buoyancy. When the liquid level of the antifreeze exceeds the height of the normally open sensor switch 11, the float 3 will rise to the top of the normally open sensor switch 11 due to the buoyancy. At this time, the normally open sensor switch 11 remains in a normal state, that is, in an open state. At this time, the resistor 12 connected in series with the normally open sensor switch 11 is equivalent to being disconnected and is not connected in series to the vehicle circuit 302 of the operating machinery. At this time, the vehicle circuit 302 of the operating machinery still has the original voltage value. During the use of the operating machinery, the antifreeze continues to flow into the The radiator 202 performs heat dissipation, so the liquid level of the antifreeze liquid will continue to drop. When the liquid level of the antifreeze liquid drops, the float 3 will slide down on the guide rod 2 until the float 3 and the normally open sensor switch 11 are at the same height. At this time, the normally open sensor switch 11 senses the float 3, and the normally open sensor switch 11 senses and closes. In this way, the wiring harness 42 connects the resistor 12 in series to the vehicle circuit 302 of the operating machine. At this time, the voltage value of the vehicle circuit 302 of the operating machine will drop significantly due to the series connection of the resistor 12, and the controller 301 of the operating machine will detect this. When the float 3 slides to the same height as the normally open induction switch 11, the normally open induction switch 11 senses the float 3, the normally open induction switch 11 is closed, and the resistor 12 is connected in series with the vehicle circuit 302. The 27V voltage signal of the vehicle circuit 302 is detected by the controller 301 and is considered normal. When the float 3 slides to the same height as the normally open induction switch 11, the normally open induction switch 11 senses the float 3, the normally open induction switch 11 is closed, and the resistor 12 is connected in series with the vehicle circuit 302. The resistance value of the resistor 12 is 210Ω, and the vehicle circuit 302 generates a 0.When the 5V voltage signal is detected by the controller 301, the controller 301 will send an alarm instruction to remind the operator to add antifreeze; after adding antifreeze, the float 3 will rise with the rise of the liquid level, and the normally open induction switch 11 will not sense the float 3, so the normally open induction switch 11 will return to the open state, and the resistor 12 will also become disconnected, that is, the resistor 12 is no longer connected in series with the whole vehicle circuit 302 of the operating machine, and the voltage of the whole vehicle circuit 302 of the operating machine returns to the original voltage value; through such a setting, only one liquid level sensor 100 is needed to detect the liquid level, which greatly reduces the detection cost, and at the same time, there is no need to change the structure of the water tank 201, which greatly simplifies the detection structure and method. .
[0040] See also Figures 1 to 3 In one embodiment, a magnet 31 is provided on the top of the float 3, and the normally open induction switch 11 includes a reed switch, which is provided inside the guide rod 2. Specifically, the reed switch is a pair of magnetic reed sheets sealed in a glass tube. Although the two sheets overlap, there is a small gap in the middle. When an external magnetic field is applied, the two magnetic reed sheets will contact each other and then conduct. Once the magnet is pulled away from the switch, the magnetic reed switch will return to its original position; that is, when the float 3 slides down to the reed switch due to the drop in liquid level, the magnet 31 will generate a magnetic field to contact the two magnetic reed sheets in the reed switch and then conduct. In this way, the resistor 12 is connected to the vehicle circuit 302, and the voltage of the vehicle circuit 302 will change. The controller 301 detects that the voltage is different from the original vehicle circuit. When the voltage of 302 is different, an alarm will be sounded to remind the operator that antifreeze needs to be added; after adding antifreeze, the float 3 will rise, so that the magnet 31 will be away from the reed switch, and the two magnetic reed sheets in the reed switch will be separated, thereby disconnecting the resistor 12, and the voltage of the vehicle circuit 302 of the operating machinery will return to the original voltage value; by setting the reed switch, it can respond quickly, and the reed switch is small in size and light in weight, so the size of the liquid level sensor 100 can be reduced; and the reed switch also has excellent corrosion resistance and wear resistance, and has a long service life.
[0041] See also Figure 1 and Figure 2In one embodiment, the guide rod 2 is also provided with an upper limit switch 21 and a lower limit switch 22. The upper limit switch 21 is provided above the lower limit switch 22, and the float 3 is located between the upper limit switch 21 and the lower limit switch 22. Specifically, when the float 3 slides down to abut against the lower limit switch 22 due to the drop in the liquid level, the magnet 31 on the top of the float 3 is exactly at the same height as the reed switch. The magnet 31 will generate a magnetic field to make the two magnetic reeds in the reed switch contact and then conduct. In this way, the resistor 12 is connected to the vehicle circuit 302, and the voltage of the vehicle circuit 302 will change. After the controller 301 detects that the voltage is different from the original vehicle circuit 302 voltage for a period of time, this time can be set, and the controller 301 will send an alarm to remind the operator to add antifreeze. Such a setting can prevent errors caused by the shaking of antifreeze. An alarm occurs; after adding antifreeze, the float 3 will rise, so that the magnet 31 will be away from the reed switch, and the two magnetic reed sheets in the reed switch will separate, thereby disconnecting the resistor 12, and the resistor 12 will not be connected in series with the vehicle circuit 302, and the voltage of the vehicle circuit 302 of the operating machinery will return to the original voltage value; when the float 3 rises to abut against the upper limit switch 21, the float 3 will not continue to rise, preventing the float 3 from continuing to rise and colliding with the top of the water tank 201, thereby greatly increasing the life of the float 3; by setting the above-mentioned structure, the accuracy of detection can be improved, the probability of false alarm can be reduced, and the service life of the float 3 can also be increased.
[0042] Furthermore, the liquid level sensor 100 also includes an upper limit circuit, which includes an upper limit sensing switch and an upper limit resistor connected to each other. The resistance value of the upper limit resistor is significantly different from the resistance value of the resistor, that is, the resistance value of the upper limit resistor is much larger than the resistance value of the resistor or the resistance value of the upper limit resistor is much smaller than the resistance value of the resistor. The upper limit sensing switch is normally open, and the upper limit switch is arranged inside the guide rod 2. When the magnet 31 on the top of the float 3 abuts against the upper limit switch, the magnet 31 is exactly at the same height as the upper limit sensing switch. The upper limit sensing switch can also be a reed switch. The magnet 31 will generate a magnetic field to make the two magnetic reed sheets in the reed switch contact and then conduct. In this way, the upper limit resistor is connected to the vehicle circuit 302, and the voltage of the vehicle circuit 302 will change. This voltage is different from the preset voltage and the voltage after the resistor is connected to the vehicle circuit 302. When the controller 301 detects the voltage, it indicates that the antifreeze has been added to the upper limit of the liquid addition. At this time, a message will be sent to remind the operator to stop adding antifreeze to prevent overfilling.
[0043] According to another aspect of the utility model, see Figures 1 to 4The utility model further provides a radiator assembly 200, including a water tank 201, a radiator 202 and the above-mentioned liquid level sensor 100. The water tank 201 is formed with a mounting hole and a receiving cavity that are interconnected. The receiving cavity is used to receive antifreeze liquid. The liquid level sensor 100 is installed in the mounting hole and extends into the receiving cavity. Since the radiator assembly 200 includes all implementation methods of all embodiments of the above-mentioned liquid level sensor 100, it has at least all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one.
[0044] See also Figures 1 to 4 In one embodiment, the guide rod 2 includes a first connecting section 23, a second connecting section 24 and a third connecting section 25 connected in sequence, the float 3 is slidably mounted on the third connecting section 25, a groove 251 is formed on the outer periphery of the second connecting section 24, and the liquid level sensor 100 also includes a sealing ring 5, the second connecting section 24 is mounted on the mounting hole, and the sealing ring 5 abuts against the inner wall of the mounting hole. Specifically, the operator first installs the sealing ring 5 on the groove 251, and the outer diameter of the sealing ring 5 is greater than the outer diameter of the second connecting section 24. In this way, after the operator lifts the third connecting section 25 into the accommodating cavity, the second connecting section 24 is installed in the mounting hole. At this time, the sealing ring 5 will abut against the inner wall of the mounting hole to prevent the antifreeze from overflowing from the mounting hole.
[0045] In one embodiment, the mounting hole is formed with an internal thread, the second connecting section 24 is formed with an external thread, and the second connecting section 24 is threadedly connected to the internal thread of the mounting hole through the external thread. When installing the liquid level sensor 100, it is only necessary to extend the third connecting section 25 into the accommodating cavity, and then hold the second connecting section 24 and rotate it in the mounting hole, so that the external thread of the second connecting section 24 will be threadedly connected to the internal thread of the mounting hole, and the installation of the liquid level sensor 100 is completed; when it is necessary to disassemble, it is only necessary to rotate the second connecting section 24 in the opposite direction, and the liquid level sensor 100 will be detached from the mounting hole, and the disassembly is completed. Through such a setting, the installation and disassembly of the liquid level sensor 100 can be completed quickly and conveniently.
[0046] According to another aspect of the utility model, see Figures 1 to 5 The utility model further provides a loader, characterized in that it includes a vehicle body and the above-mentioned radiator assembly 200. Since the loader includes all implementations of all embodiments of the above-mentioned radiator assembly 200 and the above-mentioned liquid level sensor 100, it at least has all the beneficial effects brought by all the above-mentioned implementations, which will not be described one by one here.
[0047] See also Figures 1 to 5In one embodiment, the vehicle body includes a controller 301 and a vehicle circuit 302, and the controller 301 is used to detect the voltage signal of the vehicle circuit 302. By setting the controller 301 to detect the voltage signal of the vehicle circuit 302, there is no need to manually observe the liquid level, which greatly reduces the labor intensity of the operator and realizes automatic detection.
[0048] See also Figures 1 to 5 In one embodiment, the vehicle body further includes a display screen 303, the controller 301 is signal-connected to the display screen 303, and the display screen 303 is used to display the voltage signal. During the use of the loader, the antifreeze liquid continuously flows into the radiator 202 for heat dissipation, so the liquid level of the antifreeze liquid will continue to drop. As the liquid level of the antifreeze liquid drops, the float 3 will follow and slide down on the guide rod 2 until the float 3 and the normally open sensing switch 11 are at the same height. At this time, the normally open sensing switch 11 senses the float 3, and the normally open sensing switch 11 will be closed. In this way, the wiring harness 42 will connect the resistor 12 in series to the vehicle circuit 302 of the loader. At this time, the voltage value of the vehicle circuit 302 of the loader will drop significantly due to the contact of the resistor 12. The controller 301 of the loader will detect this change and then transmit the signal to the display screen 303. The display screen 303 will display the value of the voltage signal. If the operator observes that the value is abnormal, he can add antifreeze in time. Through such a setting, the abnormal voltage signal can be displayed on the display screen 303 in time, which is convenient for the operator to observe and record.
[0049] In one embodiment, the loader further includes a warning light, which is electrically connected to the vehicle circuit 302, and is signal-connected to the controller 301. When the controller 301 detects that the voltage value of the vehicle circuit 302 changes, the controller 301 sends a signal to the warning light, and the warning light emits a bright light to remind the operator that antifreeze needs to be added. Through such a setting, the operator can be further warned to remind the operator to add antifreeze.
[0050] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A liquid level sensor for detecting the liquid level of a solution in a water tank in an operating machine, wherein the operating machine comprises a vehicle circuit (302) and a controller (301), characterized in that: include: A resistance circuit (1), the resistance circuit (1) comprising a normally open inductive switch (11) and a resistor (12) connected to each other; A guide rod (2), wherein the normally open induction switch (11) is arranged inside the guide rod (2); A float (3), the float (3) being slidably mounted on the guide rod (2), and the float (3) being able to slide to the normally open induction switch (11) to close the normally open induction switch (11); A wiring harness assembly (4), the wiring harness assembly (4) comprising a wiring harness plug-in (41) and a wiring harness (42) connected to each other, the wiring harness plug-in (41) being used to connect to a vehicle circuit (302), the wiring harness (42) being connected to the resistance circuit (1) so as to connect the resistance circuit (1) in series to the vehicle circuit (302); the controller (301) being used to detect a voltage signal of the vehicle circuit (302).
2. The liquid level sensor according to claim 1, characterized in that: A magnet (31) is arranged on the top of the float (3), and the normally open induction switch (11) comprises a reed switch, which is arranged inside the guide rod (2).
3. The liquid level sensor according to claim 2, characterized in that: The guide rod (2) is also provided with an upper limit switch (21) and a lower limit switch (22); the upper limit switch (21) is arranged above the lower limit switch (22); and the float (3) is located between the upper limit switch (21) and the lower limit switch (22).
4. A radiator assembly, characterized in that: The invention comprises a water tank (201), a radiator (202) and a liquid level sensor (100) as claimed in any one of claims 1 to 3, wherein the water tank (201) is formed with a mounting hole and a receiving cavity which are interconnected, the receiving cavity is used to receive antifreeze liquid, and the liquid level sensor (100) is mounted on the mounting hole and extends into the receiving cavity.
5. The radiator assembly according to claim 4, characterized in that: The guide rod (2) comprises a first connecting section (23), a second connecting section (24) and a third connecting section (25) which are connected in sequence, the float (3) is slidably mounted on the third connecting section (25), a groove (251) is formed on the outer periphery of the second connecting section (24), and the liquid level sensor (100) further comprises a sealing ring (5), the second connecting section (24) is mounted on the mounting hole, and the sealing ring (5) abuts against the inner wall of the mounting hole.
6. The radiator assembly according to claim 5, characterized in that: The mounting hole is formed with an internal thread, the second connecting section (24) is formed with an external thread, and the second connecting section (24) is threadably connected to the internal thread of the mounting hole via the external thread.
7. A loader, characterized in that: The invention comprises a vehicle body and a radiator assembly (200) according to any one of claims 4 to 6.
8. The loader according to claim 7, characterized in that: The vehicle body comprises a controller (301) and a vehicle circuit (302), wherein the controller (301) is used to detect a voltage signal of the vehicle circuit (302).
9. The loader according to claim 8, characterized in that: The vehicle body further comprises a display screen (303), the controller (301) is signal-connected to the display screen (303), and the display screen (303) is used to display voltage signals.
10. The loader according to claim 8, characterized in that: The loader also includes a warning light, which is electrically connected to the vehicle circuit (302) and is signal-connected to the controller (301).