Material level detector, powder supply center and material level detection method

Abstract

The invention discloses a material level detector, a powder supply center and a material level detection method. The material level detector comprises a main body, a detection pipe and a detection sensor. The main body is provided with an inner containing cavity, a diaphragm is arranged in the inner containing cavity and divides the inner containing cavity into an air inlet cavity and an induction cavity, and the main body is further provided with an air inlet and an air outlet which are communicated with the air inlet cavity. One end of the detection pipe is connected with the main body, and the other end of the detection pipe is provided with a detection port which is communicated with the air outlet of the main body. In an embodiment, the detection tube can be directly connected with the main body or connected through a connecting pipeline. The detection sensor is connected to the body and provided with a detection end and a signal output end, the detection end extends into the induction cavity or is arranged on the cavity wall of the induction cavity, and the detection sensor is used for detecting whether the diaphragm is close to the detection end or not. According to the material level detector of the structure, the powder supply center applying the material level detector and the material level detection method, error detection can be effectively avoided, and safety is good.

Description

Technical Field

[0001] The invention relates to a material position detection technology, and in particular to a material level detector, a powder supply center and a material level detection method. Background Art

[0002] In spraying production, spray powder is stored in a powder box, and the powder in the powder box is delivered to the spray gun for spraying through an output powder pump. In order to monitor the remaining amount of spray powder in the powder box, the powder box is usually provided with a material level detector. In the prior art, the material level detector usually uses some sensors such as photoelectric sensors, contact sensors, etc. that directly contact the spray powder for detection. However, the spray powder is easy to stick to the detection end of the sensor, which often causes the spray powder to be lower than the predetermined detection height, while the signal output end of the sensor still does not output the corresponding signal, resulting in the equipment and production personnel being unable to know the actual amount of powder in the powder box, affecting normal production operations. In addition, since these sensors are in direct contact with the material, there are certain safety hazards for flammable and explosive materials such as spray powder. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a material level detector that can effectively avoid the situation where the material sticks to the detection end and causes the failure of normal detection, and can perform isolated detection to effectively improve safety.

[0004] The present invention also provides a powder supply center having the material level detector.

[0005] The invention also provides a material level detection method.

[0006] According to the first aspect of the present invention, the material level detector includes: a main body, which is provided with an inner cavity, a diaphragm is provided in the inner cavity, the diaphragm divides the inner cavity into an air inlet cavity and a sensing cavity, and the main body is also provided with an air inlet and an air outlet connected to the air inlet cavity; a detection tube, one end of which is connected to the main body, the other end of which has a detection port, and the detection port is connected to the air outlet of the main body; a detection sensor, which is connected to the main body, the detection sensor is provided with a detection end and a signal output end, the detection end extends into the sensing cavity or is provided on the cavity wall of the sensing cavity, and the detection sensor is used to detect whether the diaphragm is close to the detection end.

[0007] The material level detector according to the embodiment of the present invention has at least the following beneficial effects: when the material level detector is used, compressed gas can be input into the air inlet, and the compressed gas is blown to the material through the detection tube, and the position change of the diaphragm when the material blocks and opens the detection port is used to indirectly determine the presence or absence of the material. By adopting the air blowing detection method, even if the material sticks to the detection port, it will be blown away by the gas, thereby effectively avoiding the problem of false detection; in addition, the detection sensor does not directly contact the material, and it is the detection tube that contacts the material, and the air blowing detection method does not have the problem of the material entering the inside of the main body, thereby achieving better electrical isolation and good safety.

[0008] According to some embodiments of the present invention, the diaphragm is provided with a detection member, the detection end of the detection sensor is opposite to the detection member, and the detection sensor is a proximity sensor capable of detecting whether the detection member is close to the detection end.

[0009] According to some embodiments of the present invention, the detection sensor is configured to be able to adjust its position relative to the body in a direction approaching and away from the diaphragm.

[0010] According to some embodiments of the present invention, a gas pressure stabilizer is further included, wherein the gas pressure stabilizer is connected to the main body and is used to discharge the gas in the gas inlet cavity when the pressure of the gas inlet cavity exceeds a predetermined range.

[0011] According to the second aspect of the present invention, the powder supply center includes: a powder box, which is provided with a powder cavity; the material level detector described in the first aspect of the present invention, the material level detector is used to detect the powder spraying height in the powder cavity; a compressed air source, connected to the main body and used to input compressed gas to the air inlet; a control host, connected to the signal output end of the detection sensor, and the control host is connected to an information output terminal.

[0012] The powder supply center according to the embodiment of the present invention has at least the following beneficial effects: since the material level detector of the first aspect of the present invention is used for detection, the powder supply center is not prone to misdetection of the powder amount in the powder box, and the detection structure has sufficient electrical isolation and good safety.

[0013] According to some embodiments of the present invention, the detection tube is transversely disposed on a side wall of the powder box, and one end of the detection tube provided with the detection port extends into the powder cavity or is located on a side wall of the powder cavity.

[0014] According to some embodiments of the present invention, a powder supply pump is further included, wherein the powder supply pump is used to suck the spray powder and supply it to the powder box, and the control host can control the action of the powder supply pump.

[0015] According to some embodiments of the present invention, the detection tube is vertically installed through a mounting frame, an insertion port is provided at the upper end of the powder box, the detection port is provided at the lower end of the detection tube, and the detection tube is inserted downward into the powder chamber through the insertion port.

[0016] According to some embodiments of the present invention, the powder supply center also includes a powder suction pipe, an output powder pump and a lifting assembly, the powder suction pipe and the detection pipe are vertically arranged, the detection port is arranged at the lower end of the detection pipe, the lower end of the powder suction pipe is provided with a powder suction port, the output powder pump is connected to the powder suction pipe and can suck and spray powder through the powder suction pipe for external output, the powder suction pipe and the detection pipe are arranged side by side on the lifting assembly, the detection pipe is arranged flush with the lower end of the powder suction pipe, the lifting assembly is connected to the control host, and the lifting assembly is used to drive the powder suction pipe and the detection tube to rise and fall.

[0017] According to the third aspect of the present invention, the material level detection method includes the following steps: obtaining the material level detector described in the first aspect of the present invention, setting the detection tube so that the detection port of the detection tube is set at the position required for detection; inputting compressed air flow into the air inlet; determining the presence or absence of material by monitoring the signal change at the signal output end of the detection sensor: defining the diaphragm approaching the detection end as a behavior of triggering the detection sensor, when the detection sensor is triggered and remains in the triggered state, it is judged that there is still material at the current location of the detection port; when the detection sensor loses the triggered state, it is judged that there is no material at the current location of the detection port.

[0018] The material level detection method according to the embodiment of the present invention has at least the following beneficial effects: by using the above method to detect the material level, false detection is not prone to occur, there is sufficient electrical isolation, and the safety is good.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a three-dimensional schematic diagram of a material level detector according to an embodiment of the present invention;

[0022] Figure 2 It is an exploded schematic diagram of a material level detector according to an embodiment of the present invention;

[0023] Figure 3 is a cross-sectional view of a material level detector according to an embodiment of the present invention;

[0024] Figure 4 It is a structural schematic diagram of a powder supply center according to an embodiment of the present invention;

[0025] Figure 5 An electrical schematic diagram of a powder supply center according to an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of another structure of a powder supply center according to an embodiment of the present invention;

[0027] Figure 7 This is an electrical schematic diagram of another structure of a powder supply center according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] Main body 100, diaphragm 110, air inlet cavity 120, sensing cavity 130, air inlet 140, air outlet 150, mounting hole 160, front seat body 170, rear seat body 180, locking hole 171, matching fixing hole 181, through hole 111;

[0030] Detection tube 200, detection port 210, connecting pipeline 201;

[0031] Detection sensor 300, detection end 310, signal output end 320;

[0032] Detection parts 400;

[0033] Air pressure stabilizer 500;

[0034] Powder box 600, powder chamber 610;

[0035] Compressed gas source 700;

[0036] Control host 800;

[0037] Powder supply pump 900;

[0038] Powder suction tube 1000;

[0039] Lifting assembly 1100. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0044] Reference Figures 1 to 3 , a material level detector, comprising: a main body 100, a detection tube 200 and a detection sensor 300. The main body 100 is provided with an inner cavity, in which a diaphragm 110 is provided, and the diaphragm 110 divides the inner cavity into an air inlet cavity 120 and a sensing cavity 130, and the main body 100 is also provided with an air inlet 140 and an air outlet 150 connected to the air inlet cavity 120. One end of the detection tube 200 is connected to the main body 100, and the other end of the detection tube 200 has a detection port 210, and the detection port 210 is connected to the air outlet 150 of the main body 100. In an embodiment, the detection tube 200 can be directly connected to the main body 100 or connected through a connecting pipeline 201. The detection sensor 300 is connected to the main body 100, and is provided with a detection end 310 and a signal output end 320. The detection end 310 extends into the sensing cavity 130 or is provided on the cavity wall of the sensing cavity 130. The detection sensor 300 is used to detect whether the diaphragm 110 is close to the detection end 310. It should be understood that the diaphragm 110 is close to the detection end 310, which means that the diaphragm 110 is deformed toward the detection end 310 in the original state.

[0045] When the material level detector is used, one end of the detection tube 200 with the detection port 210 is set to a predetermined position of the material container, the main body 100 is connected to a compressed gas source, and the compressed gas is input through the air inlet 140. When the material is sufficient at the predetermined position, the detection port 210 can be blocked by the material, so that the air pressure of the air inlet chamber 120 will increase, so that the diaphragm 110 expands and stretches toward the sensing chamber 130, and the detection end 310 of the detection sensor 300 detects the approach of the diaphragm 110, and outputs the detection signal through the signal output end 320; when the material is used and the material level drops to expose the detection port 210, the detection port 210 is no longer blocked, and the compressed gas is ejected smoothly, so that the air pressure of the air inlet chamber 120 drops, the diaphragm 110 recovers its deformation, the detection sensor 300 loses the trigger of the diaphragm 110, and the detection signal returns to its original state, thereby realizing the detection of the material level.

[0046] When the above-mentioned material level detector is used, compressed gas can be input into the air inlet 140, and the compressed gas can be blown toward the material through the detection tube 200. The position change of the diaphragm 110 when the material blocks and opens the detection port 210 is used to indirectly determine the presence or absence of the material. By adopting the method of air blowing detection, even if the material sticks to the detection port 210, it will be blown away by the gas, thereby effectively avoiding the problem of false detection; in addition, the detection sensor 300 does not directly contact the material, and it is the detection tube 200 that contacts the material, and the method of air blowing detection does not have the problem of the material entering the inside of the main body 100, thereby achieving better electrical isolation and good safety. Since the detection tube 200 only needs to play the role of sending gas, in some embodiments, the main body 100 and the detection sensor 300 can be set together to a position farther away from the material by lengthening the detection tube 200 or connecting the main body 100 and the detection tube 200 through the connecting pipeline 201, so as to improve electrical safety.

[0047] In the embodiment, the diaphragm 110 is provided with a detection member 400, and the detection end 310 of the detection sensor 300 is opposite to the detection member 400, and the detection sensor 300 is a proximity sensor that can detect whether the detection member 400 is close to the detection end 310. With the above structure, by arranging the detection member 400 on the diaphragm 110 to be used in conjunction with the detection sensor 300, accurate detection can be performed more conveniently. In addition, the detection end 310 of the detection sensor 300 and the detection member 400 are opposite to each other, and an extreme limit can also be formed to prevent the diaphragm 110 from being overstretched and damaged. In the embodiment, the detection member 400 is arranged at the center of the diaphragm 110, so that the structure is balanced and the detection is sensitive and accurate.

[0048] In the embodiment, the detection member 400 may specifically be a metal washer, and the detection sensor 300 may be a matching proximity sensor, such as a metal detector. Of course, it is conceivable that the detection member 400 is not limited to the metal washer, and may be a magnet, for example. Then the proximity sensor may be a magnetic sensor, such as a reed switch or a Hall sensor. It is understandable that in some embodiments, the diaphragm 110 may not be provided with the detection member 400, and the detection sensor 300 may be a sensor that can directly detect the position of the diaphragm 110, such as a photoelectric sensor.

[0049] In an embodiment, the detection sensor 300 is configured to be able to adjust its position relative to the body 100 in a direction close to and away from the diaphragm 110, so as to facilitate adjustment of the detection threshold or sensitivity.

[0050] In the embodiment, the detection sensor 300 is rod-shaped, and the main body 100 is provided with a mounting hole 160, the mounting hole 160 is connected to the sensing cavity 130, and the detection sensor 300 is inserted into the sensing cavity 130 through the mounting hole 160. In order to achieve the position adjustment of the detection sensor 300, a thread can be set on the periphery of the detection sensor 300, and the mounting hole 160 is correspondingly provided with a matching internal thread, and the position adjustment is achieved by rotating the detection sensor 300. In addition, the fixing can be assisted by threading a nut on the periphery of the detection sensor 300. Of course, it is conceivable that there are many other embodiments for adjusting the position of the detection sensor 300, for example, by setting an indefinite number of washers between the detection sensor 300 and the main body 100 to achieve position adjustment. It can be understood that in this field, there are many embodiments for achieving component position adjustment, and those skilled in the art can reasonably configure according to actual conditions.

[0051] In the embodiment, the position of the diaphragm 110 is directly detected by a proximity sensor. It is conceivable that the detection sensor 300 is not limited to the direct detection method to detect the position of the diaphragm 110. For example, an indirect detection method may also be used. For example, the detection sensor 300 uses an air pressure sensor to indirectly detect the position of the diaphragm 110 by detecting the change in air pressure in the sensing cavity 130: when the diaphragm 110 is deformed toward the detection end 310 of the detection sensor 300, the air pressure in the sensing cavity 130 will increase, and vice versa, it will decrease, thereby realizing indirect detection of the position of the diaphragm 110.

[0052] In the embodiment, a gas pressure stabilizer 500 is further included, and the gas pressure stabilizer 500 is connected to the main body 100. The gas pressure stabilizer 500 is used to discharge the gas in the air inlet chamber 120 when the pressure of the air inlet chamber 120 exceeds a predetermined range. With the above structure, it is possible to avoid excessive pressure in the air inlet chamber 120, which may cause damage to components, and stabilize the pressure in the air inlet chamber 120. In the embodiment, the gas pressure stabilizer 500 may adopt some pressure relief valves or exhaust valves, or adopt throttles, such as throttling mufflers, etc., as long as it can play the role of pressure relief or diversion.

[0053] In the embodiment, the main body 100 includes a front seat body 170 and a rear seat body 180, and the diaphragm 110 is clamped and fixed between the front seat body 170 and the rear seat body 180. The diaphragm 110 and the rear seat body 180 enclose an air cavity 120, and the air cavity 120 and the front seat body 170 enclose a sensing cavity 130. The diaphragm 110 can be bonded to the end faces of the front seat body 170 and the rear seat body 180 by adhesive, so that the structure is stable. In the embodiment, a plurality of locking holes 171 are arranged around the front seat body 170, and matching fixing holes 181 corresponding to the locking holes 171 are arranged around the rear seat body 180. The matching fixing holes 181 are screw holes or through holes, and the locking holes 171 and the matching fixing holes 181 are penetrated with threaded fasteners for locking the front seat body 170 and the rear seat body 180 together. The diaphragm 110 is provided with through holes 111 corresponding to the locking holes 171 on a one-to-one basis around the diaphragm 110 , and the threaded fasteners are also passed through the through holes 111 , so that the diaphragm 110 is installed more firmly.

[0054] Reference Figures 4 to 7 The powder supply center provided by the present invention includes: a powder box 600, the above-mentioned material level detector, a compressed air source 700 and a control host 800. The powder box 600 is provided with a powder chamber 610, the material level detector is used to detect the powder spraying height in the powder chamber 610, the compressed air source 700 is connected to the main body 100 and is used to input compressed gas to the air inlet 140, the control host 800 is connected to the signal output end 320 of the detection sensor 300, and the control host 800 is connected to an information output terminal. Since the material level detector of the first aspect of the present invention is used for detection, the powder supply center is not prone to misdetection of the powder amount in the powder box 600, and the detection structure has sufficient electrical isolation and good safety.

[0055] In the embodiment, the information output terminal is, for example, a display screen. After the information output terminal of the detection sensor 300 outputs a signal to the control host 800, the control host 800 displays the detected information through the display screen. The information output terminal can also be an audible and visual alarm. For example, when there is no material at the detection position, an audible and visual alarm can be used to sound an alarm.

[0056] In an embodiment, the compressed gas source 700 may be an air compressor or a compressed gas tank, and a pressure regulating valve and an air intake throttle valve may be provided on the pipeline connecting the compressed gas source 700 and the main body 100 for regulation.

[0057] In an embodiment, Figure 4 As shown, the detection tube 200 is horizontally arranged on the side wall of the powder box 600, and one end of the detection tube 200 provided with a detection port 210 extends into the powder chamber 610 or is located on the side wall of the powder chamber 610. With the above structure, the height of the powder spraying can be detected from the side, and the detection is convenient and the height detection is accurate. In the embodiment, a plurality of material level detectors are provided, and the detection tubes 200 of the plurality of material level detectors are arranged vertically on the side wall of the powder box 600, so that detection can be performed at different heights.

[0058] In an embodiment, Figure 5 As shown, the powder supply center also includes a powder supply pump 900, which is used to suck the spray powder and supply it to the powder box 600, and the control host 800 can control the action of the powder supply pump 900. With the above structure, when the absence of the material at the detection position is detected, the control host 800 can control the powder supply pump 900 to replenish the spray powder to the powder box 600, thereby avoiding the powder box 600 from running out of powder.

[0059] In an embodiment, the control host 800 may be a PLC, an industrial computer, etc. In an embodiment, the powder supply pump 900 is a pneumatic powder pump, and the control host 800 may be connected to a solenoid valve that controls the air supply of the powder supply pump 900, thereby controlling the action of the powder supply pump 900.

[0060] In some embodiments, Figure 6 As shown, the detection tube 200 is vertically installed through the mounting frame, the upper end of the powder box 600 is provided with an insertion port, the lower end of the detection tube 200 is provided with a detection port 210, and the detection tube 200 is inserted downward into the powder chamber 610 through the insertion port. With the above structure, the detection tube 200 is vertically arranged and inserted into the powder box 600, which can avoid the detection tube 200 being arranged on the side wall of the powder box 600, thereby simplifying the structure of the powder box 600 and facilitating maintenance and cleaning.

[0061] In some embodiments, Figure 7As shown, the powder supply center also includes a powder suction pipe 1000, an output powder pump and a lifting assembly 1100. The powder suction pipe 1000 and the detection pipe 200 are vertically arranged, the detection port 210 is arranged at the lower end of the detection pipe 200, the lower end of the powder suction pipe 1000 is provided with a powder suction port, the output powder pump is connected to the powder suction pipe 1000 and can suck and spray powder through the powder suction pipe 1000 for external output, the powder suction pipe 1000 and the detection pipe 200 are arranged in parallel on the lifting assembly 1100, the detection pipe 200 is arranged flush with the lower end of the powder suction pipe 1000, the lifting assembly 1100 is connected to the control host 800, and the lifting assembly 1100 is used to drive the powder suction pipe 1000 and the detection pipe 200 to rise and fall. When powder needs to be delivered to the outside, the lifting assembly 1100 can be used to drive the powder suction pipe 1000 and the detection pipe 200 to move downward together. When the detection pipe 200 hits the material surface, the detection port 210 will be blocked, and the detection sensor 300 can be triggered, so that the height position of the material surface can be detected. At this time, the lifting assembly 1100 can be stopped by controlling the host 800, so that the powder suction pipe 1000 can suck and spray powder at the position of the material surface. With the above structure, the material level detector can play a role in locating the material surface, which is convenient for the powder suction pipe 1000 to suck and spray powder at a suitable position.

[0062] In the embodiment, the lifting drive may be a cylinder, an electric push rod, or a linear motor, which may be selected according to actual conditions.

[0063] The material level detection method provided by the present invention comprises the following steps:

[0064] A material level detector according to any one of claims 1 to 4 is obtained, and a detection tube 200 is arranged so that a detection port 210 of the detection tube 200 is arranged at a position to be detected;

[0065] Inputting compressed air into the air inlet 140;

[0066] The presence or absence of material is determined by monitoring the signal changes at the signal output terminal 320 of the detection sensor 300: the diaphragm 110 approaching the detection terminal 310 is defined as the behavior of triggering the detection sensor 300. When the detection sensor 300 is triggered and remains in the triggered state, it is judged that there is still material at the current location of the detection port 210; when the detection sensor 300 loses the triggered state, it is judged that there is no material at the current location of the detection port 210.

[0067] The material level is detected by the above method, which is not prone to false detection, has sufficient electrical isolation and good safety. The above material level detection method can be written into the program of the control host 800 of the powder supply center as a program, and the control host 800 acquires and processes the detection signal, makes judgments and outputs information.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A material level detector, characterized in that: include: A main body (100) is provided with an inner cavity, a diaphragm (110) is provided in the inner cavity, the diaphragm (110) divides the inner cavity into an air inlet cavity (120) and a sensing cavity (130), and the main body (100) is also provided with an air inlet (140) and an air outlet (150) which are in communication with the air inlet cavity (120); A detection tube (200), one end of which is connected to the main body (100), and the other end of the detection tube (200) is provided with a detection port (210), and the detection port (210) is connected to the air outlet (150) of the main body (100); A detection sensor (300) is connected to the main body (100), and the detection sensor (300) is provided with a detection end (310) and a signal output end (320). The detection end (310) extends into the sensing cavity (130) or is arranged on the cavity wall of the sensing cavity (130). The detection sensor (300) is used to detect whether the diaphragm (110) is close to the detection end (310).

2. The material level detector according to claim 1, characterized in that: The diaphragm (110) is provided with a detection member (400), the detection end (310) of the detection sensor (300) is opposite to the detection member (400), and the detection sensor (300) is a proximity sensor capable of detecting whether the detection member (400) is close to the detection end (310).

3. The material level detector according to claim 2, characterized in that: The detection sensor (300) is configured to be able to adjust its position relative to the body (100) in a direction approaching and moving away from the diaphragm (110).

4. The material level detector according to claim 1, characterized in that: It also includes a gas pressure stabilizer (500), which is connected to the main body (100) and is used to discharge the gas in the gas inlet cavity (120) when the pressure in the gas inlet cavity (120) exceeds a predetermined range.

5. A powder supply center, characterized in that: include: A powder box (600) is provided with a powder chamber (610); The material level detector according to any one of claims 1 to 4, wherein the material level detector is used to detect the powder spraying height in the powder chamber (610); A compressed gas source (700) connected to the main body (100) and used to input compressed gas into the gas inlet (140); A control host (800) is connected to the signal output end (320) of the detection sensor (300), and the control host (800) is connected to an information output terminal.

6. The powder supply center according to claim 5, characterized in that: The detection tube (200) is transversely arranged on the side wall of the powder box (600), and one end of the detection tube (200) provided with the detection port (210) extends into the powder chamber (610) or is located on the side wall of the powder chamber (610).

7. The powder supply center according to claim 5, characterized in that: It also includes a powder supply pump (900), which is used to suck the spray powder and supply it to the powder box (600). The control host (800) can control the operation of the powder supply pump (900).

8. The powder supply center according to claim 5, characterized in that: The detection tube (200) is vertically installed via a mounting frame, an insertion port is provided at the upper end of the powder box (600), the detection port (210) is provided at the lower end of the detection tube (200), and the detection tube (200) is inserted downward into the powder chamber (610) through the insertion port.

9. The powder supply center according to claim 5, characterized in that: The powder supply center further comprises a powder suction pipe (1000), a powder output pump and a lifting assembly (1100); the powder suction pipe (1000) and the detection pipe (200) are arranged vertically; the detection port (210) is arranged at the lower end of the detection pipe (200); the lower end of the powder suction pipe (1000) is provided with a powder suction port; the output powder pump is connected to the powder suction pipe (1000) and can suck and output powder through the powder suction pipe (1000); the powder suction pipe (1000) and the detection pipe (200) are arranged in parallel on the lifting assembly (1100); the detection pipe (200) and the lower end of the powder suction pipe (1000) are arranged flush; the lifting assembly (1100) is connected to the control host (800); and the lifting assembly (1100) is used to drive the powder suction pipe (1000) and the detection pipe (200) to rise and fall.

10. A material level detection method, characterized in that: The steps include: Obtain the material level detector according to any one of claims 1 to 4, and arrange the detection tube (200) so that the detection port (210) of the detection tube (200) is arranged at a position to be detected; Inputting a compressed air flow into the air inlet (140); The presence or absence of material is determined by monitoring the signal change at the signal output end (320) of the detection sensor (300): the proximity of the diaphragm (110) to the detection end (310) is defined as an action of triggering the detection sensor (300); when the detection sensor (300) is triggered and remains in the triggered state, it is determined that material still exists at the current location of the detection port (210); when the detection sensor (300) loses the triggered state, it is determined that there is no material at the current location of the detection port (210).

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