A throttle valve state detection method and a method for adjusting a supply air mode of powder spraying

Abstract

The present application provides a kind of throttle valve state detection method, comprising the following steps: step S1: throttle motor motion state judging device is connected with throttle motor, the induced current of throttle motor under different motion states is sampled, the running step number of throttle motor is judged, and the running step number data is delivered to throttle motor position calculator;Step S2: throttle motor position calculator calculates the actual position of throttle motor operation according to running step number data and feedback to throttle motor controller;Step S3: throttle motor controller receives throttle motor actual position data and compares with the preset throttle motor target, judges whether actual position is consistent with target position, when actual position is consistent with target position, then throttle motor action ends;When actual position is not consistent with target position, then issue instruction set to throttle motor, control throttle motor continues to act, repeat step S1 and step S2, until actual position is consistent with target position.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electrostatic powder spraying, and particularly relates to a method for detecting the state of a throttle valve and a method for adjusting the gas supply mode of powder spraying. BACKGROUND

[0002] In the field of electrostatic powder spraying, the control of the gas supply amount of the powder pump by the spray gun controller is a very important part of powder atomization, which directly affects the quality of powder spraying. The control of the gas path by the spray gun controller is realized through a throttle valve. At present, most of the spray gun controllers on the market need special reset structures and supporting hardware detection circuits for reset detection of the throttle valve, which is relatively complex in structure design and circuit board hardware design. Usually, it is composed of a micro switch installed on the spray gun and a reset rod connected with the throttle valve. One end of the reset rod is connected with the valve core or valve rod of the throttle valve, and the other end is close to the micro switch. When the throttle valve works normally, the reset rod moves with the valve core of the throttle valve. When the throttle valve needs to be reset, the valve core returns to the initial position, and the reset rod also returns to the corresponding position, triggering the micro switch. Moreover, the movement of the throttle valve may cause the position of the reset detection structure to deviate, resulting in abnormal reset and origin setting of the throttle valve, thereby affecting the gas supply effect.

[0003] The spray gun controller controls the gas supply through the throttle valve and delivers compressed air to the powder pump to realize powder extraction and atomization. At present, most of the powder pumps on the market are Venturi powder pumps, which need two-way gas supply to complete the work, namely delivery gas and atomization gas. The delivery gas generates suction through the Venturi effect to suck the powder from the powder suction pipe, and the atomization gas blows the sucked powder out along the powder pipe. The gas supply amount of the delivery gas and the atomization gas determines the size of the powder suction amount and the atomization effect. At present, the common gas supply method is balanced type gas supply, which distributes the size of the delivery gas and the atomization gas under the action of a certain distribution formula. Generally, the total gas amount is kept unchanged, and the method of reducing the amount of delivery gas is used to increase the amount of atomization gas. However, with the increase of powder types, the balanced type gas supply method is prone to problems such as small powder output, powder agglomeration and blockage when applied to enamel powder and other powders with large unit mass. In addition, the gas pipe, powder pipe, powder pump and other accessories are prone to wear and tear to varying degrees after a long period of use. After wear and tear, the balanced type gas supply method is also prone to the problem of poor powder output effect. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a detection method for simplifying the internal mechanical structure of the throttle valve and accurately detecting the state of the throttle valve, and a method for independently adjusting the gas supply mode of electrostatic powder spraying based on the detection method.

[0005] In order to solve the above technical problems, the present application provides a throttle valve state detection method, comprising a throttle motor, a throttle motor controller, a throttle motor motion state determinator and a throttle motor position calculator. The throttle motor is connected with a throttle valve body to control the opening and closing state of the throttle valve body. The detection method comprises the following steps:

[0006] Step S1: The throttle motor motion state determinator is connected with the throttle motor to sample the induced current of the throttle motor in different motion states, determine the running step number of the throttle motor, and deliver the running step number data to the throttle motor position calculator.

[0007] Step S2: The throttle motor position calculator calculates the actual position of the throttle motor running according to the running step number data and feeds back to the throttle motor controller.

[0008] Step S3: The throttle motor controller receives the actual position data of the throttle motor and compares it with the preset throttle motor target to determine whether the actual position is consistent with the target position.

[0009] When the actual position is consistent with the target position, the throttle motor action ends.

[0010] When the actual position is not consistent with the target position, the throttle motor is instructed to continue to act, and steps S1 and S2 are repeated until the actual position is consistent with the target position.

[0011] Preferably, the throttle motor comprises a first winding group, a second winding group and a throttle motor shaft. The throttle motor motion state determinator is electrically connected with the first winding group and the second winding group. When the throttle motor operates, the first winding group or the second winding group of the throttle motor is enabled in a single direction. The throttle motor shaft rotates and acts on the other winding group to generate an induced current. The throttle motor motion state determinator samples the induced current generated by the other winding group which is not enabled.

[0012] Preferably, the throttle motor action comprises five states:

[0013] First state: enable the first winding group, the enable direction is from the first end to the second end of the first winding group, and the induced current is sampled at the second end of the second winding group;

[0014] Second state: enable the second winding group, the enable direction is from the first end to the second end of the second winding group, and the induced current is sampled at the second end of the first winding group;

[0015] Third state: enable the first winding group, the enable direction is from the second end to the first end of the first winding group, and the induced current is sampled at the first end of the second winding group;

[0016] The fourth state: enabling the second winding set, the enabling direction is from the second end to the first end of the second winding set, and the induced current is sampled at the first end of the first winding set;

[0017] The fifth state: not enabling the throttling motor, and not generating induced current;

[0018] The operation step number of the throttling motor is determined by the induced current data obtained by sampling.

[0019] Preferably, the calculation formula of the induced current I generated by the first winding set or the second winding set is:

[0020]

[0021] Wherein, I is the induced current of the winding set, E is the induced electromotive force, and R is the resistance of the winding set.

[0022] Further, the calculation formula of the induced electromotive force is:

[0023]

[0024] Wherein, B is the magnetic induction intensity, L is the wire length, v is the movement speed, and θ is the included angle between the movement direction and the magnetic induction direction, and the movement speed v is determined by the movement state of the throttling motor shaft;

[0025] After the induced current is sampled, the movement speed v is calculated and the operation step number of the throttling motor is determined.

[0026] The present application also provides a method for adjusting the air supply mode of powder spraying, which applies the throttling valve state detection method as described in any one of the above, and specifically comprises the following steps:

[0027] Step S21: presetting the target powder amount and the target air amount according to the working condition of powder spraying;

[0028] Step S22: the total input of the air supply of the spray gun controller is divided into the conveying air throttling valve and the atomizing air throttling valve through the air exhaust, and the movement state of the conveying air throttling valve and the atomizing air throttling valve is adjusted to adjust the conveying air amount and the atomizing air amount;

[0029] Step S23: the conveying air and the atomizing air are conveyed to the powder pump to complete powder extraction and atomized powder, and after the powder extraction and the atomized powder are completed, the conveying air throttling valve and the atomizing air throttling valve are reset;

[0030] Step S24: during the process of steps S22 and S23, the movement state of the conveying air throttling valve and the atomizing air throttling valve is detected, whether the movement state of the conveying air throttling valve and the atomizing air throttling valve is consistent with the preset state, and whether the conveying air throttling valve and the atomizing air throttling valve are reset after the powder extraction and the atomized powder are completed.

[0031] Preferably, the total input of the lance controller is pulsed, and steps S21 to S24 are repeated during each input.

[0032] Preferably, the gas supply mode includes a semi-automatic adjustment mode, which includes the following steps:

[0033] Step S31: preset target powder amount and preset target gas amount;

[0034] Step S32: calculate the values of the delivery gas amount and the atomizing gas amount according to the gas supply balance formula;

[0035] Step S33: individually adjust the delivery gas amount and the atomizing gas amount based on the calculation results of step S32, and adjust the delivery gas throttle valve and the atomizing gas throttle valve.

[0036] Preferably, the gas supply mode includes a manual adjustment mode, which includes the following steps:

[0037] Step S41: preset target powder amount and preset target gas amount;

[0038] Step S42: calculate the values of the delivery gas amount and the atomizing gas amount according to the preset target values, and manually adjust the delivery gas throttle valve and the atomizing gas throttle valve.

[0039] Compared with the prior art, the throttle valve state detection method has at least the following beneficial effects:

[0040] 1. The throttle valve state detection method simplifies the mechanical mechanism inside the throttle valve, calculates the number of steps and actions of the throttle motor by detecting the induced current based on the different directions and sizes of the induced current generated by the throttle motor when it is in action, and determines the state of the throttle valve and whether it is successfully reset. This method avoids complex mechanical mechanisms, reduces detection failure caused by mechanical mechanism deviation, and further affects the gas supply effect, and has accurate throttle valve state detection and stable control of the throttle valve.

[0041] The powder spraying adjustment gas supply mode method provided by the present application has at least the following beneficial effects based on the above-mentioned throttle valve state detection method:

[0042] 1. Thanks to the accurate detection of the state of the throttle valve and the stable control of the throttle valve, the independent control and adjustment of the gas supply mode during the spraying process are realized for powder spraying, and compared with the existing balanced gas supply method, the gas supply mode can be independently adjusted according to different types of powder used, and the throttle valve can be completely reset during the working process to ensure the powder output and powder effect. BRIEF DESCRIPTION OF DRAWINGS

[0043] The above and other objects, features and advantages of the present application will become more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Like reference numerals are used to refer to like elements throughout the several views and the terms "first", "second", "third", "fourth" and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the descriptive terms "first", "second", "third", "fourth", and the like, etc., in the context of the description, are not necessarily used consistently in respect of these embodiments.

[0044] Figure 1 Flow chart of the throttle valve state detection method provided by the embodiment of the present application;

[0045] Figure 2 First to fourth state diagrams of the throttle motor in the throttle valve state detection method provided by the embodiment of the present application;

[0046] Figure 3 Flow chart of the semi-automatic adjustment mode of the method for adjusting the air supply mode of powder spraying provided by another embodiment of the present application;

[0047] Figure 4 Flow chart of the manual adjustment mode of the method for adjusting the air supply mode of powder spraying provided by another embodiment of the present application. DETAILED DESCRIPTION

[0048] The technical solutions of the present application will be described in further detail below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it. However, the embodiments are not intended to limit the present application. In the embodiments, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated as a whole, or there can be a middle element. The terms "mount", "one end", "the other end" and similar expressions used in the present application are only for the purpose of illustration.

[0050] This invention provides a method for detecting the state of a throttle valve, including a throttle motor, a throttle motor controller, a throttle motor motion state determiner, and a throttle motor position calculator. The throttle motor is connected to the throttle valve body to control the opening and closing state of the throttle valve body. It can be understood that the throttle valve in this embodiment mainly includes two main parts—the throttle valve body and the throttle motor. The throttle motor controls the opening and closing of the throttle valve body by rotating, thereby controlling the amount of gas supplied. For example, the throttle motor uses a four-wire two-phase stepper motor. When the throttle motor is driven to rotate, the rotation of the permanent magnet on the motor shaft induces a current in the unstarted winding group. When the throttle motor encounters resistance, the rotation state of the motor shaft changes, and the induced current in the winding group also changes synchronously. Therefore, this embodiment detects the state of the throttle motor by detecting the induced current. Specifically, a four-wire two-phase stepper motor typically includes a stator, a rotor, and bearings. The stator consists of two winding groups 90° apart, referred to as phase A and phase B, respectively. The winding groups are designed with a certain number of turns and wire diameter to generate a sufficiently strong and stable magnetic field. In the case of full step control, only one winding group is activated at a time, causing the motor to rotate by one step angle. At the same time, an induced current is generated in the other winding group, and then the other winding group is activated to make the motor continue to rotate.

[0051] Understandably, the throttle motor controller is used to control the operation of the throttle motor, the throttle motor motion state judge is used to sample and analyze the induced current, and the throttle motor position calculator calculates the operating position of the throttle motor based on the induced current data.

[0052] The detection method includes the following steps:

[0053] Step S1: The throttling motor motion state detector is connected to the throttling motor, samples the induced current of the throttling motor under different motion states, determines the number of steps the throttling motor has taken, and transmits the step count data to the throttling motor position calculator. It is understood that the throttling motor will generate different induced currents at different numbers of steps and different rotation directions. The throttling motor motion state detector is electrically connected to the throttling motor and can be placed on the throttling motor itself, or in other locations within the spraying system, such as the main controller or circuit board. After sampling the induced current, the throttling motor motion state detector can determine the number of steps the throttling motor has taken at that moment.

[0054] Step S2: The throttle motor position calculator calculates the actual position of the throttle motor based on the number of running steps and feeds it back to the throttle motor controller;

[0055] Step S3: The throttle motor controller receives the actual position data of the throttle motor and compares it with the preset throttle motor target to determine whether the actual position matches the target position.

[0056] When the actual position is consistent with the target position, the throttling motor action ends;

[0057] When the actual position is not consistent with the target position, the throttling motor is issued with a command set to control the throttling motor to continue to act, and steps S1 and S2 are repeated until the actual position is consistent with the target position.

[0058] The detection of whether the throttling valve completes the reset is also based on the above method. In the process of the throttling motor controlling the throttling valve to reset, when the throttling valve body reaches the reset point and cannot be further closed, the throttling motor shaft will stop rotating, at this time, no induced current is generated in the winding set, and at this time, the throttling motor motion state judging device can judge the state of the throttling motor to judge that the throttling valve has completed the reset.

[0059] In the embodiment, the throttling motor includes a first winding set (A phase), a second winding set (B phase) and a throttling motor shaft (M), the throttling motor motion state judging device is electrically connected with the first winding set and the second winding set, when the throttling motor operates, the first winding set or the second winding set of the throttling motor is enabled in a single direction, the throttling motor shaft rotates and acts on the other winding set to make the other winding set generate an induced current, and the throttling motor motion state judging device samples the induced current generated by the other winding set which is not enabled. Understandably, the first winding set corresponds to the A phase of the step motor, and the second winding set corresponds to the B phase of the step motor, when the throttling motor operates, the throttling motor follows the single-winding single-direction enabling mode, so that the induced current is generated in the winding set which is not enabled, and the throttling motor motion state judging device can sample the induced current of the winding set which is not enabled, and can accurately judge the operating state of the throttling motor through the induced current.

[0060] In the embodiment, the throttling motor action includes five states:

[0061] The first state: enable the first winding set, the enabling direction is from the first end to the second end of the first winding set, and the induced current sampling is performed at the second end of the second winding set;

[0062] The second state: enable the second winding set, the enabling direction is from the first end to the second end of the second winding set, and the induced current sampling is performed at the second end of the first winding set;

[0063] Understandably, in the first state and the second state, the first end to the second end of the first winding set (A phase) and the second winding set (B phase) are enabled in turn, which can make the throttling motor shaft rotate one circle, at this time, the induced current sampling is performed at the second end of the first winding set and the second winding set respectively, and the motion state of the throttling motor can be judged.

[0064] The third state: enabling the first winding set, the enabling direction is from the second end to the first end of the first winding set, and the induced current is sampled at the first end of the second winding set;

[0065] The fourth state: enabling the second winding set, the enabling direction is from the second end to the first end of the second winding set, and the induced current is sampled at the first end of the first winding set;

[0066] It can be understood that in the third state and the fourth state, the second end to the first end of the first winding set (A phase) and the second winding set (B phase) are enabled in turn, which can make the throttle motor reverse rotate one circle, and at this time, the induced current is sampled at the first end of the first winding set and the second winding set respectively, so that the motion state of the throttle motor can be determined.

[0067] The fifth state: not enabling the throttle motor, and no induced current is generated; in this state, the throttle valve is reset, the throttle motor does not rotate, and no induced current is generated in the first winding set or the second winding set, so that it can be determined that the throttle valve is reset.

[0068] The operation steps of the throttle motor are determined by the induced current data obtained by sampling.

[0069] In the embodiment, the calculation formula of the induced current I generated by the first winding set or the second winding set is:

[0070]

[0071] Wherein, I is the induced current of the winding set, E is the induced electromotive force, and R is the resistance of the winding set.

[0072] Further, the calculation formula of the induced electromotive force is:

[0073]

[0074] Wherein, B is the magnetic induction intensity, L is the wire length, v is the motion speed, and θ is the angle between the motion direction and the magnetic induction direction. The motion speed v is determined by the motion state of the throttle motor shaft. It can be understood that for a fixed throttle motor, the magnetic induction intensity B is determined by the parameters of the winding set, such as the number of turns and the wire diameter, and is related to the core material and shape of the motor, so for a fixed throttle motor, the magnetic induction intensity B is determined, and thus the following formula can be obtained according to the above formula:

[0075]

[0076] Therefore, it can be seen that the motion speed depends on the size and direction of the induced current, and after sampling the induced current, the motion speed v can be accurately calculated and the operation steps of the throttle motor can be determined.

[0077] For example, the control of a throttle valve can be simplified as follows: the throttle motor controller determines the motion state and position of the throttle motor by sampling the induced current, and uses an instruction set to regulate the throttle motor, including increasing the rotation angle / speed, decreasing the rotation angle / speed, or resetting it. See details... Figure 1 This avoids the need for a reset structure and complex reset detection components inside the throttle valve that cannot be used stably for a long time, thus enabling accurate reset and control of the throttle valve.

[0078] Traditional balanced air supply modes follow a balanced distribution formula that maintains a constant total air volume. This means that the amount of delivery gas and atomizing gas is allocated under a specific formula, typically by reducing the amount of delivery gas equal to increasing the amount of atomizing gas to keep the total air volume constant. However, this method is sensitive to environmental conditions and powder characteristics. Specifically, environmental factors such as temperature and humidity affect the physical properties of the gas and the flowability of the powder. In high-temperature and high-humidity environments, the density and viscosity of the gas change, potentially causing the originally set balanced air supply parameters to become inaccurate, affecting powder delivery and spraying results. Sensitivity to powder characteristics also refers to poor powder adaptability: different types and batches of powder coatings vary in particle size, shape, density, and flowability. For some powders with special characteristics, the balanced air supply mode may struggle to quickly adapt and maintain a stable air-to-powder ratio, requiring frequent parameter adjustments or even replacement of some air supply equipment components.

[0079] Therefore, embodiments of the present invention also provide a method for adjusting the air supply mode in powder coating, which applies the throttle valve status detection method as described in any of the above claims, specifically including the following steps:

[0080] Step S21: Preset the target powder quantity and target air quantity according to the powder spraying conditions; for example, before powder spraying, it is necessary to calculate the required powder quantity based on the structural shape of the workpiece to be sprayed, the type of powder used, the required coating thickness, and other conditions, and then calculate the required air quantity during the spraying process.

[0081] Step S22: The total air input of the spray gun controller distributes compressed air to the delivery air throttle valve and the atomizing air throttle valve through the air outlet, and adjusts the movement state of the delivery air throttle valve and the atomizing air throttle valve to regulate the delivery air volume and the atomizing air volume.

[0082] Step S23: Deliver the delivery gas and atomizing gas to the powder pump to complete the powder extraction and atomization; after the powder extraction and atomization are completed, control the delivery gas throttle valve and the atomizing gas throttle valve to reset.

[0083] Step S24: During the steps S22 and S23, the movement state of the delivery gas throttle valve and the atomizing gas throttle valve is detected, and it is determined whether the movement state of the delivery gas throttle valve and the atomizing gas throttle valve is consistent with the preset state, and whether the delivery gas throttle valve and the atomizing gas throttle valve are reset after the powder is drawn and the powder is atomized.

[0084] Thanks to the accurate detection of the state of the throttle valve and the use of the throttle motor to control and reset the throttle valve instead of the traditional mechanical structure, the delivery gas amount and the atomizing gas amount can be independently regulated, that is, the gas amount of different gas paths is independently adjusted by independently regulating the delivery gas throttle valve and the atomizing gas throttle valve, which greatly increases the accuracy and stability of the powder amount in the powder spraying process, and the flexibility and reliability of the regulation.

[0085] In the embodiment, the total input of the air supply of the spray gun controller is pulse air supply, and the steps S21 to S24 are repeatedly performed in each air supply process.

[0086] In the preferred embodiment, the air supply mode includes a semi-automatic regulation mode, which combines the gas amount balance distribution formula in the balanced air supply mode and increases the function of individual regulation of each gas path on the basis of the result, so as to realize the supplement and correction of the poor effect of the balanced distribution formula. Specifically, the following steps are included:

[0087] Step S31: presetting a target powder amount and a preset target gas amount;

[0088] Step S32: calculating the values of the delivery gas amount and the atomizing gas amount according to the air supply balance formula;

[0089] Step S33: individually regulating the delivery gas amount and the atomizing gas amount on the basis of the calculation result of step S32, and regulating the delivery gas throttle valve and the atomizing gas throttle valve.

[0090] Specifically, before the powder spraying is performed, the delivery gas amount and the atomizing gas amount are calculated according to the balanced air supply mode and formula based on the structure and shape of the workpiece to be sprayed, the type of powder to be used, the required thickness of the coating, and the like, and the special powder such as enamel powder is individually regulated by the throttle valve to ensure the powder output and the powder effect.

[0091] In the preferred embodiment, the air supply mode includes a manual regulation mode, and the following steps are included:

[0092] Step S41: presetting a target powder amount and a preset target gas amount;

[0093] Step S42: calculating the values of the delivery gas amount and the atomizing gas amount according to the preset target values, and manually individually regulating the delivery gas throttle valve and the atomizing gas throttle valve.

[0094] Specifically, in the manual adjustment mode, the delivery gas throttle valve and the atomizing gas throttle valve are manually adjusted according to the target powder amount and the target gas amount, that is, all the gas supply paths are adjusted in the independent mode, so that the gas amount of a single gas supply path can be adjusted independently.

[0095] The method for adjusting the gas supply mode of the powder spraying provided in the scheme improves the current balanced gas supply mode on the basis of the detection and control of the throttle valve, and adds or changes the independent adjustment mode of the throttle valve. Meanwhile, based on the control and detection of the throttle motor, the accurate control of the throttle valve can be realized, so that the powder output effect and the spraying effect can be ensured during the powder spraying process. In addition, due to the accurate control of the throttle valve, the unreasonable wear of the valve body, the powder pump and other components during the gas supply and powder supply process is reduced, and the service life of the valve body, the powder pump and other components is further reduced.

[0096] In the present specification, unless specifically defined and limited, a first feature is "on", "under", "above", or "below" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature "above", "over", and "on" the second feature can be directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under", and "under" the second feature can be directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0097] In the description of the present specification, the description of the terms "preferred embodiment", "further embodiment", "other embodiment", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0098] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for adjusting a supply air pattern of a powder spray, characterized by, The method comprises the following steps: Step S21: presetting a target powder amount and a target gas amount according to a powder spraying working condition; Step S22: the air supply total input of the spray gun controller is branched to a conveying gas throttle valve and an atomizing gas throttle valve through an air discharge, and the movement state of the conveying gas throttle valve and the atomizing gas throttle valve is adjusted to adjust the conveying gas amount and the atomizing gas amount; Step S23: conveying gas and atomizing gas are conveyed to a powder pump to complete powder pumping and powder atomization, and the conveying gas throttle valve and the atomizing gas throttle valve are controlled to reset after the powder pumping and the powder atomization are completed; Step S24: during the steps S22 and S23, the movement state of the conveying gas throttle valve and the atomizing gas throttle valve is detected, whether the movement state of the conveying gas throttle valve and the atomizing gas throttle valve is consistent with a preset state is judged, and whether the conveying gas throttle valve and the atomizing gas throttle valve are reset after the powder pumping and the powder atomization are completed is judged; The movement state of the conveying gas throttle valve and the atomizing gas throttle valve is detected by using a throttle valve state detection method, which comprises a throttle motor, a throttle motor controller, a throttle motor movement state judging device, and a throttle motor position calculator. The throttle motor is connected with a throttle valve body to control the opening and closing state of the throttle valve body. The detection method comprises the following steps: Step S1: the throttle motor movement state judging device is connected with the throttle motor, the induced current of the throttle motor in different movement states is sampled, the running step number of the throttle motor is judged, and the running step number data is transmitted to the throttle motor position calculator; Step S2: the throttle motor position calculator calculates the actual position of the throttle motor according to the running step number data and feeds back the actual position to the throttle motor controller; Step S3: the throttle motor controller receives the actual position data of the throttle motor and compares the actual position with a preset throttle motor target, and judges whether the actual position is consistent with the target position, when the actual position is consistent with the target position, the throttle motor action ends; when the actual position is not consistent with the target position, an instruction set is issued to the throttle motor to control the throttle motor to continue to act, and steps S1 and S2 are repeated until the actual position is consistent with the target position.

2. The method of claim 1, wherein, The throttle motor comprises a first winding group, a second winding group and a throttle motor shaft. The throttle motor movement state judging device is electrically connected with the first winding group and the second winding group. When the throttle motor operates, the first winding group or the second winding group of the throttle motor is enabled in a single direction. The throttle motor shaft rotates and acts on the other winding group to make the other winding group generate an induced current. The throttle motor movement state judging device samples the induced current generated by the other winding group which is not enabled.

3. The method for adjusting the air supply mode in powder coating as described in claim 2, characterized in that, The throttle motor action comprises five states: First state: enable the first winding group, the enabling direction is from the first end to the second end of the first winding group, and the induced current sampling is performed at the second end of the second winding group; Second state: enable the second winding group, the enabling direction is from the first end to the second end of the second winding group, and the induced current sampling is performed at the second end of the first winding group; Third state: enable the first winding group, the enabling direction is from the second end to the first end of the first winding group, and the induced current sampling is performed at the first end of the second winding group; The fourth state: enabling the second winding set, the direction of enabling is from the second end to the first end of the second winding set, and the induced current is sampled at the first end of the first winding set; The fifth state: not enabling the throttle motor, and no induced current is generated; The operation steps of the throttle motor are determined by the induced current data obtained by sampling.

4. The method for adjusting the air supply mode for powder coating as described in claim 2, characterized in that, The calculation formula of the induced current I generated by the first winding set or the second winding set is: ， Wherein, I is the induced current of the winding set, E is the induced electromotive force, and R is the resistance of the winding set.

5. The method for adjusting the air supply mode for powder coating as described in claim 4, characterized in that, The calculation formula of the induced electromotive force is: ， Wherein, B is the magnetic induction intensity, L is the wire length, v is the movement speed, and θ is the included angle between the movement direction and the magnetic induction direction, and the movement speed v is determined by the movement state of the throttle motor shaft; After sampling the induced current, the movement speed v is calculated and the operation steps of the throttle motor are determined.

6. The method for adjusting the air supply mode for powder coating as described in claim 1, characterized in that, The total input of the spray gun controller is pulse air supply, and steps S21 to S24 are repeated in each air supply process.

7. The method of claim 1, wherein the powder spray adjustment is made by, The air supply mode includes a semi-automatic adjustment mode, which specifically includes the following steps: Step S31: presetting a target powder amount and a preset target air amount; Step S32: calculating the values of the conveying air amount and the atomizing air amount according to an air supply balance formula; Step S33: separately adjusting the conveying air amount and the atomizing air amount based on the calculation result of step S32, and adjusting the conveying air throttle valve and the atomizing air throttle valve.

8. The method of claim 1, wherein the powder spray adjustment is made by, The air supply mode includes a manual adjustment mode, which specifically includes the following steps: Step S41: presetting a target powder amount and a preset target air amount; Step S42: calculating the values of the conveying air amount and the atomizing air amount according to the preset target values, and manually separately adjusting the conveying air throttle valve and the atomizing air throttle valve.

Images