Static electricity detection device in feeding process of powder mixing technology

Abstract

The invention provides an electrostatic detection device in a charging process of a powder mixing process. The material electrical parameter measuring device comprises a powder mixing device used for feeding and mixing powder and obtaining the weight of the powder; the electrostatic potential measuring units are arranged at a plurality of different positions in a powder conveying path of the powder mixing device and are used for detecting electrostatic potentials generated in the feeding and conveying processes; and the electrostatic charge quantity measuring unit is arranged in the mixing completion area of the powder mixing device and is used for measuring the electrostatic charge quantity carried by the mixed powder.

Description

Technical Field

[0001] This invention relates to a material electrical parameter measuring device, and more particularly to an electrostatic detection device during the feeding process of a powder mixing process. Background Technology

[0002] In the processing of energetic materials (such as solid propellants and explosives) in aerospace and in the powder processing of pharmaceuticals, chemicals, and food industries, powders such as pharmaceutical powders are prone to static electricity buildup due to friction and collision during feeding, conveying, and mixing. When the static potential or charge exceeds a critical value, it may trigger a spark discharge, leading to safety accidents such as dust explosions and powder combustion explosions, seriously threatening production safety and the lives and health of personnel. The feeding process is particularly critical in powder mixing processes.

[0003] In existing technologies, powder feeding typically relies on traditional mechanical transmission and control methods, using simple sensors to monitor basic parameters such as the feeding amount to ensure the feeding process proceeds roughly normally. However, existing technologies have the following drawbacks:

[0004] 1. It is difficult to simulate complex working conditions such as different feeding speeds, conveying paths, and equipment materials, and it is impossible to obtain the electrostatic law under the influence of multiple factors;

[0005] 2. The layout of the measuring components and the feeding and conveying system is unreasonable, or the use of contact measurement interferes with the charged state of the powder, resulting in insufficient data accuracy;

[0006] 3. It is impossible to study the electrostatic behavior of powder by changing the materials of key components, making it difficult to support quantitative research on electrostatic safety thresholds.

[0007] Chinese patent publication number CN118274668A discloses "a powdered material feeding device". This device uses a specific structural design and a weight sensor to control the feeding of powdered materials and detect the weight change of the powder in the hopper, thereby determining whether the feeding process meets the preset requirements.

[0008] However, the aforementioned technical solutions can only monitor the single parameter of powder feeding amount and cannot monitor electrostatic parameters during the feeding process. During powder feeding, static electricity is easily generated due to friction between particles and with the conveying device. Excessive static electricity can lead to powder adsorption and agglomeration, affecting mixing uniformity and even posing safety hazards such as explosions. This existing technology cannot monitor electrostatic-related parameters, making it difficult to guarantee the quality and safety of the powder mixing process.

[0009] Chinese patent publication CN119224439A discloses "An electrostatic detection device for the feeding process of energetic material powder". This device includes a voltage conversion probe, a high-voltage wire, a non-contact voltage sensor, an explosion-proof junction box, signal and power lines, an isolated safety barrier, a control module, and a control cabinet. It is capable of detecting the electrostatic potential during the feeding process of energetic powder.

[0010] However, the above method can only detect a single parameter of electrostatic potential and cannot fully reflect the true state of electrostatic accumulation. Summary of the Invention

[0011] To address the technical problems existing in the prior art, the present invention aims to provide an electrostatic detection device for the feeding process of powder mixing, thereby realizing multi-dimensional and multi-condition monitoring of electrostatic parameters during the powder feeding process.

[0012] To achieve the above-mentioned objective, the present invention provides an electrostatic detection device during the feeding process of a powder mixing process, comprising:

[0013] A powder mixing device is used to add and mix powders and obtain the weight of the powders;

[0014] An electrostatic potential measurement unit is set at multiple different positions in the powder conveying path of the powder mixing device to detect the electrostatic potential generated during feeding and conveying.

[0015] An electrostatic charge measurement unit is installed in the mixing completion area of ​​the powder mixing device to measure the electrostatic charge carried by the mixed powder.

[0016] According to one technical solution of the present invention, the powder mixing device includes a support frame and a feeding device;

[0017] The feeding device includes a height adjustment push rod, a feeding hopper, a feeding weighing sensor, and a flow regulating valve;

[0018] The fixed end of the height adjustment push rod is fixedly connected to the support frame;

[0019] The movable end of the height adjustment push rod is fixedly connected to the feeding hopper so as to drive the feeding hopper to move up and down relative to the support frame;

[0020] The feeding weighing sensor is used to obtain the weight of the powder in the feeding hopper;

[0021] The flow regulating valve is located at the powder outlet of the feeding hopper and is used to regulate the powder discharge flow rate.

[0022] According to one technical solution of the present invention, the powder mixing device further includes a conveying device;

[0023] The conveying device includes a powder conveying trough and a conveying device mounting frame;

[0024] The powder conveying trough is fixed to the conveying device mounting frame, and one end of the powder conveying trough is located directly below the powder outlet of the feeding hopper.

[0025] The conveying device mounting bracket is mounted on the support frame and can adjust the tilt angle of the powder conveying trough.

[0026] According to one technical solution of the present invention, the conveying device further includes an angle adjustment mechanism;

[0027] The angle adjustment mechanism includes an adjustment wheel, an adjustment gear, and an adjustment rack;

[0028] The conveying device mounting frame is rotatably connected to the support frame via a rotating shaft, and the rotating shaft is perpendicular to the long axis of the powder conveying trough.

[0029] The adjusting gear is rotatably connected to the conveying device mounting frame via a gear shaft, and the gear shaft is parallel to the rotating shaft;

[0030] The adjusting rack is an arc-shaped rack with its center on the rotating shaft. The adjusting rack is fixedly connected to the side wall of the support frame and meshes with the adjusting gear.

[0031] When the adjusting gear rotates, it can drive the conveying device mounting frame to rotate around the rotating shaft;

[0032] The side wall of the support frame is provided with an arc-shaped slot, and the trajectory of the arc-shaped slot matches the movement path of the adjusting wheel;

[0033] The adjusting wheel is coaxially and fixedly connected to the adjusting gear via a connecting shaft passing through the arc-shaped slot.

[0034] According to one technical solution of the present invention, the angle adjustment mechanism further includes an angle sensor;

[0035] The angle sensor is used to obtain the tilt angle of the powder conveying trough.

[0036] According to one technical solution of the present invention, the powder conveying trough is provided with a length adjustment groove along the length direction;

[0037] The conveying device mounting frame is equipped with locking components;

[0038] The locking member passes through the length adjustment groove and detachably fixes the powder conveying trough to the conveying device mounting frame, so that the powder conveying trough can be adjusted in position relative to the material outlet of the feeding hopper along its length direction.

[0039] According to one technical solution of the present invention, the inner surfaces of the feeding hopper and the powder conveying trough that come into contact with the powder are provided with a replaceable antistatic layer.

[0040] According to one technical solution of the present invention, the electrostatic potential measurement unit includes at least four electrostatic potential sensors;

[0041] At least one electrostatic potential sensor is disposed on the inner wall of the feeding hopper;

[0042] At least one electrostatic potential sensor is installed at the material outlet of the feeding hopper;

[0043] At least one electrostatic potential sensor is installed in the middle section of the powder conveying trough;

[0044] At least one electrostatic potential sensor is disposed at the end of the powder conveying trough.

[0045] According to one technical solution of the present invention, the electrostatic charge measurement unit includes a first Faraday cylinder;

[0046] The powder mixing device also includes a receiving mechanism;

[0047] The material receiving mechanism includes a material receiving slide rail, a telescopic bracket, and a first mixing weighing sensor;

[0048] The receiving slide rail is fixed to the bottom of the support frame;

[0049] One end of the telescopic bracket is slidably mounted on the receiving slide rail, and the other end is fixedly connected to the first Faraday cylinder;

[0050] The first Faraday cylinder can move along the receiving slide rail to below the end of the powder conveying trough under the drive of the telescopic bracket, and is used to receive the mixed powder and collect the electrostatic charge signal of the mixed powder;

[0051] The first mixing weighing sensor is mounted on the telescopic bracket and is used to obtain the weight of the mixed powder in the first Faraday cylinder.

[0052] According to one technical solution of the present invention, the electrostatic charge measuring unit further includes a second Faraday cylinder;

[0053] The material receiving mechanism also includes a second mixing and weighing sensor;

[0054] The second Faraday cylinder is slidably disposed on the receiving slide rail and can move along the receiving slide rail to below the end of the powder conveying trough, for receiving mixed powder and collecting the electrostatic charge signal of the mixed powder;

[0055] The second mixing weighing sensor is used to obtain the weight of the mixed powder in the second Faraday cylinder.

[0056] The present invention provides an electrostatic detection device during the feeding process of a powder mixing process, which has the following beneficial effects:

[0057] 1. Integrates non-contact electrostatic potential and closed charge measurement to achieve comprehensive characterization of electrostatic state;

[0058] 2. By adjusting the feeding speed, adjusting the parameters of the powder conveying trough, and changing the material of the electrostatic layer, complex scenarios in industrial production can be simulated, supporting the study of electrostatic laws under the influence of multiple factors.

[0059] 3. It can drive valves, push rods, and other mechanisms according to priority, ensuring precise and effective adjustment;

[0060] 4. The system employs a quick-change component structure, a precise adjustment mechanism, and a reasonable layout of monitoring points to ensure data accuracy and testing efficiency.

[0061] This invention, through innovative hardware design, enables multi-dimensional and multi-condition monitoring of electrostatic parameters during powder feeding, solving the problems of incomplete monitoring and poor adaptability of existing devices. It can provide a reliable experimental platform for the safety of aerospace energetic solid propellant production, as well as for the electrostatic safety research of powders in the pharmaceutical, chemical and other industries, and has significant practical value. Attached Figure Description

[0062] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0063] Figure 1 This schematic diagram illustrates the structure of an electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention.

[0064] Figure 2 This schematic diagram illustrates the electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention, with one side baffle removed.

[0065] Figure 3 This diagram illustrates the cooperative structure of the feeding device and the conveying device in an electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention.

[0066] Figure 4This schematic diagram illustrates the structure of the feeding device in the electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention.

[0067] Figure 5 This schematic diagram illustrates the structure of the conveying device in the electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention.

[0068] Figure 6 This diagram schematically illustrates the cooperation structure between the receiving mechanism and the electrostatic charge measurement unit in an electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention.

[0069] Figure 7 This schematic diagram illustrates the electrical structure of an electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention.

[0070] Figure 8 This schematic diagram illustrates the main circuit of the PLC control system in an electrostatic detection device during the feeding process of a powder mixing process according to an embodiment of the present invention.

[0071] Figure 9 This diagram illustrates the circuit diagram of the main unit input signals in a PLC control system.

[0072] Figure 10 This diagram illustrates the circuit diagram of each input signal of the analog input module in a PLC control system.

[0073] Figure 11 This is a schematic diagram illustrating the first circuit diagram of each output signal of the controller in a PLC control system.

[0074] Figure 12 This is a schematic diagram illustrating the second circuit diagram of the controller's output signals in a PLC control system.

[0075] Figure 13 This diagram illustrates the connection circuits of devices such as frequency converters and vibrators in a PLC control system.

[0076] Figure 14 This diagram illustrates the first power supply and distribution in a PLC control system.

[0077] Figure 15 This diagram illustrates the second power supply and distribution system in a PLC control system.

[0078] Figure 16 This diagram illustrates the third power supply and distribution system in a PLC control system.

[0079] Figure 17 This diagram illustrates the third power supply and distribution system in a PLC control system. Detailed Implementation

[0080] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0081] The descriptions of the embodiments herein, including any references to directions and orientations, are for ease of description only and should not be construed as limiting the scope of the invention. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims. Figures 1-17 As shown; Specific Implementation Method 1

[0083] This embodiment provides an electrostatic detection device for the feeding process of a powder mixing process, comprising:

[0084] A powder mixing device is used to add and mix powders and obtain the weight of the powders;

[0085] An electrostatic potential measurement unit is installed at multiple different locations in the powder transport path of the powder mixing device to detect the electrostatic potential generated during feeding and transport.

[0086] The electrostatic charge measurement unit is located in the mixing completion area of ​​the powder mixing device and is used to measure the electrostatic charge carried by the mixed powder.

[0087] In this embodiment, such as Figures 1-2 As shown, the multi-parameter electrostatic monitoring device for the powder mixing process feeding in this embodiment includes four core subsystems:

[0088] The main body structure subsystem (powder mixing device), electrostatic potential detection subsystem (electrostatic potential measurement unit), electrostatic charge measurement unit (electrostatic charge measurement unit), and remote control system work together to achieve electrostatic monitoring of multiple parameters and multiple operating conditions.

[0089] The electrostatic detection device in this embodiment is based on the existing feeding amount monitoring device, with the addition of an electrostatic potential measurement unit and an electrostatic charge measurement unit. Corresponding data acquisition and data processing modules (included in the remote control system) are also added. The electrostatic potential and electrostatic charge measurement units transmit the monitored electrostatic potential and charge signals to the data acquisition module, which then transmits the signals to the data processing module for processing and analysis together with the monitored feeding amount (weight of powder).

[0090] This implementation method enables simultaneous monitoring of electrostatic parameters such as electrostatic potential and electrostatic charge, as well as the feeding amount, during the feeding process. This allows for a comprehensive understanding of the feeding process's status. It also supports the study of electrostatic characteristics under different operating conditions, providing hardware support for electrostatic safety management in powder production and ensuring the quality and safety of powder mixing processes. Specific Implementation Method Two

[0092] This embodiment is a further explanation of embodiment one. In this embodiment, the powder mixing device includes a support frame 1 and a feeding device 2.

[0093] The feeding device 2 includes a height adjustment push rod 2-1, a feeding hopper 2-2, a feeding weighing sensor 2-3, and a flow regulating valve 2-4;

[0094] The fixed end of the height adjustment push rod 2-1 is fixedly connected to the support frame 1;

[0095] The moving end of the height adjustment push rod 2-1 is fixedly connected to the feeding hopper 2-2 so as to drive the feeding hopper 2-2 to move up and down relative to the support frame 1;

[0096] The feeding weighing sensor 2-3 is used to obtain the weight of the powder in the feeding hopper 2-2;

[0097] The flow regulating valve 2-4 is located at the powder outlet of the feeding hopper 2-2 and is used to regulate the discharge flow rate of the powder.

[0098] In this embodiment, such as Figures 1-2 As shown, the powder mixing device, serving as the fundamental support and core for operating condition regulation of the entire system, includes:

[0099] Support frame 1: It is constructed by screwing and welding carbon steel profiles. Its dimensions are 2.8m×1.1m×1.8m (length×width×height, which can be changed according to actual needs). Adjustable feet are provided at the bottom to ensure levelness. This support frame 1 provides a stable installation foundation for other components of the device, ensuring that the structure does not shake during monitoring.

[0100] like Figures 3-4As shown, the feeding device 2 consists of a height adjustment push rod 2-1 (electric push rod), a feeding hopper 2-2 (volume 5L~10L), a feeding weighing sensor 2-3, a replaceable flow regulating valve 2-4 (electrically controlled valve), and a feeding device mounting frame 2-5.

[0101] The feeding device 2 is fixed to the upper part of the support frame 1.

[0102] Specifically, the feeding hopper 2-2 is fixed to the upper part of the support frame 1 via the feeding device mounting bracket 2-5 and the hopper support. The feeding device mounting bracket 2-5 is provided with a hopper insertion hole, and at least one feeding weighing sensor 2-3 is arranged around the hopper insertion hole. Figure 3 , 4 As shown, the loading weighing sensor 2-3 is a ring-shaped weighing sensor, with four evenly distributed around the hopper insertion hole. The loading hopper 2-2 is connected to the nut by bolts passing through the ring hole of the ring-shaped weighing sensor.

[0103] The feeding hopper 2-2 passes through the hopper insertion hole and is generally fixed to the feeding weighing sensor 2-3. This allows the feeding device mounting bracket 2-5 to fix the feeding hopper 2-2 via the feeding weighing sensor 2-3, and the feeding weighing sensor 2-3 can only collect the overall weight of the feeding hopper 2-2. The weight of the feeding hopper 2-2 can be obtained in advance (e.g., during the production or calibration stage), and subsequently, the weight of the feeding hopper 2-2 can be automatically retrieved by the PLC after passing through the feeding weighing sensor 2-3, thus obtaining the weight of the powder material inside the feeding hopper 2-2.

[0104] The main body of the feeding hopper 2-2 is made of 316 stainless steel. The outlet of the feeding hopper 2-2 is connected to the flow regulating valve 2-4. The flow regulating valve 2-4 is controlled by the PLC electrical control system (controlled by pulse signal) to adjust the opening degree (0~100% adjustable) and the opening and closing speed, so as to realize the continuous adjustment of the feeding speed (5g / s-50g / s).

[0105] The height adjustment push rod 2-1 is used to adjust the distance between the hopper and the conveying trough. Different distances will cause changes in the electrostatic value, which is used to study the chemical mechanism of the powder in depth.

[0106] A vibrating motor 2-6 is also installed on the side wall of the feeding hopper 2-2, and the feeding speed is adjusted by the vibration intensity of the vibrating motor 2-6. Specific Implementation Method 3

[0108] This embodiment is a further explanation of embodiment two. In this embodiment, the powder mixing device also includes a conveying device 3.

[0109] The conveying device 3 includes a powder conveying trough 3-1 and a conveying device mounting frame 3-2;

[0110] The powder conveying trough 3-1 is fixed to the conveying device mounting bracket 3-2, and one end of the powder conveying trough 3-1 is located directly below the powder outlet of the feeding hopper 2-2.

[0111] The conveying device mounting bracket 3-2 is mounted on the support frame 1 and can adjust the tilt angle of the powder conveying trough 3-1.

[0112] In this embodiment, such as Figures 1-3 As shown in Figure 5, the powder conveying path of the powder mixing device is the conveying device 3.

[0113] The powder conveying trough 3-1 is installed on the conveying device mounting frame 3-2, with one end located below the hopper outlet and the other end extending above the receiving platform. By adding the conveying device 3, the angle and length of the powder conveying pipeline can be adjusted, making the conveying speed and transmission time adjustable and controllable, which is convenient for studying the electrostatic law. Specific Implementation Method Four

[0115] This embodiment is a further explanation of embodiment three. In this embodiment, the conveying device 3 also includes an angle adjustment mechanism 3-3.

[0116] The angle adjustment mechanism 3-3 includes an adjustment wheel 3-3-1, an adjustment gear 3-3-2, and an adjustment rack 3-3-3;

[0117] The conveying device mounting frame 3-2 is rotatably connected to the support frame 1 via a rotating shaft, and the rotating shaft is perpendicular to the long axis of the powder conveying trough 3-1;

[0118] The adjusting gear 3-3-2 is rotatably connected to the conveyor mounting bracket 3-2 via a gear shaft, and the gear shaft is parallel to the rotating shaft.

[0119] The adjusting rack 3-3-3 is an arc-shaped rack with its center on the rotating shaft. The adjusting rack 3-3-3 is fixedly connected to the side wall of the support frame 1 and meshes with the adjusting gear 3-3-2.

[0120] When the adjusting gear 3-3-2 rotates, it can drive the conveyor mounting bracket 3-2 to rotate around the rotating shaft;

[0121] The side wall of the support frame 1 is provided with an arc-shaped slot, and the trajectory of the arc-shaped slot matches the movement path of the adjusting wheel 3-3-1;

[0122] The adjusting wheel 3-3-1 is coaxially and fixedly connected to the adjusting gear 3-3-2 via a connecting shaft passing through an arc-shaped slot.

[0123] In this embodiment, such as Figures 1-3 As shown in Figure 5, the angle adjustment mechanism 3-3 is mounted on the support frame 1 via the conveyor mounting bracket 3-2.

[0124] An arc-shaped adjusting rack 3-3-3 is installed on each of the left and right sides of the support frame 1, and it is also equipped with an adjusting gear 3-3-2 and an adjusting wheel 3-3-1 (handwheel).

[0125] To ensure consistent angle adjustment, symmetrical adjusting gears 3-3-2 can be installed on both sides of the conveyor mounting frame 3-2, connected by a gear shaft for synchronous rotation. The adjusting gears 3-3-2 mesh with the arc-shaped adjusting rack 3-3-3 on the same side. Two or only one rotating adjusting wheel 3-3-1 can be installed, rotating synchronously with the adjusting gear 3-3-2. The arc-shaped slot connects the inside and outside. The rotating adjusting wheel 3-3-1 must always be positioned on the outside of the support frame 1 for easy operator access. The placement of the adjusting gear 3-3-2 depends on the position of the arc-shaped adjusting rack 3-3-3 (which can be installed on either the outside or inside).

[0126] The conveying device mounting bracket 3-2 is fixed to the support frame 1 by a rotating shaft, which serves as the rotating shaft for overall angle adjustment. By rotating the adjusting wheel 3-3-1, the adjusting gear 3-3-2 is driven to rotate, and it cooperates with the arc-shaped adjusting rack 3-3-3, so that the angle adjustment of the powder conveying trough 3-1 from 0° to 80° can be realized. Detailed Implementation Method Five

[0128] This embodiment is a further explanation of embodiment four. In this embodiment, the angle adjustment mechanism 3-3 also includes an angle sensor 3-3-4.

[0129] Angle sensor 3-3-4 is used to obtain the tilt angle of powder conveying trough 3-1.

[0130] In this embodiment, the angle sensor 3-3-4 transmits the angle data of the powder conveying trough 3-1 to the PLC control system in real time, and displays it on the touch screen for the operator to observe. Specific Implementation Method Six

[0132] This embodiment is a further explanation of embodiment three. In this embodiment, the powder conveying trough 3-1 is provided with a length adjustment trough 3-1-1 along the length direction;

[0133] The conveyor mounting bracket 3-2 is equipped with locking components;

[0134] The locking element passes through the length adjustment groove 3-1-1 and detachably fixes the powder conveying trough 3-1 to the conveying device mounting bracket 3-2, so that the powder conveying trough 3-1 can adjust its position relative to the material outlet of the feeding hopper 2-2 along its length direction.

[0135] In this embodiment, such as Figure 5As shown, length adjustment slots 3-1-1 (elongated kidney-shaped holes) are opened on both sides of the powder conveying trough 3-1. By adjusting the fixed position of the powder conveying trough 3-1 in the length adjustment slot 3-1-1, the effective length of the powder conveying trough 3-1 (adjustable from 0.2m to 1m) can be adjusted. The effective length is the actual length of the conveyed powder (the length through which the powder passes). By adjusting the position of the powder conveying trough 3-1 relative to the material outlet of the feeding hopper 2-2 along its length direction, the position of the powder conveying trough 3-1 corresponding to the material outlet of the feeding hopper 2-2 in the length direction is changed, thereby changing the effective length of the powder conveying trough 3-1. The adjusted length can be obtained by installing a laser rangefinder 3-1-2 on the powder conveying trough 3-1. The laser emitter of the laser rangefinder 3-1-2 is mounted on the device mounting bracket 3-2 and can emit laser and receive reflected signals. The reflecting prism of the laser rangefinder 3-1-2 is installed at the end of the powder conveying trough 3-1, which can reflect the laser signal back. This allows for the coordinated measurement of the effective length of the powder conveying trough 3-1.

[0136] Furthermore, the powder conveying trough 3-1 is replaceable, and multiple powder conveying troughs 3-1 of different lengths can be prepared (such as 0.4m, 0.8m, 1.2m, etc.). This avoids the situation where only one length of powder conveying trough 3-1 is used, and when adjusting the effective length, the rear end (ineffective length end) of the powder conveying trough 3-1 is too long, which may affect the operation of other components of the device. Detailed Implementation Method Seven

[0138] This embodiment is a further explanation of one of embodiments two to six. In this embodiment, the inner surfaces of the feeding hopper 2-2 and the powder conveying trough 3-1 that come into contact with the powder are provided with a replaceable antistatic layer.

[0139] In this embodiment, the surface materials of the feeding hopper 2-2 and the powder conveying trough 3-1 can be changed simultaneously. For example, antistatic mats, antistatic packaging film, antistatic PVC board or brass and other antistatic layers can be laid on the stainless steel surface. This allows for testing the influence of different materials on the electrostatic charging law, and is used to study the charging law of powder under different materials.

[0140] The antistatic layer is fixed by adhesive strips on the back, and the operation time for changing antistatic layers of different materials should be less than or equal to 10 minutes. Detailed Implementation Method Eight

[0142] This embodiment is a further explanation of embodiment seven. In this embodiment, the electrostatic potential measurement unit includes at least four electrostatic potential sensors 4.

[0143] At least one electrostatic potential sensor 4 is disposed on the inner wall of the feeding hopper 2-2;

[0144] At least one electrostatic potential sensor 4 is installed at the material outlet of the feeding hopper 2-2;

[0145] At least one electrostatic potential sensor 4 is installed in the middle section of the powder conveying trough 3-1;

[0146] At least one electrostatic potential sensor 4 is disposed at the end of the powder conveying trough 3-1.

[0147] In this embodiment, the electrostatic potential measurement unit consists of multiple non-contact electrostatic potential sensors 4, used for non-contact measurement of the electrostatic potential of the powder. The non-contact design avoids interference with the charged state of the powder. They are respectively installed at different positions in the powder conveying trough 3-1 and on the inner wall of the feeding hopper 2-2.

[0148] Specifically, the electrostatic potential sensor 4 (MEMS non-contact electrostatic voltage probe: measurement range 0-100kV, accuracy ±1%, response speed ≤100ms) is installed on an adjustable bracket (maximum extension distance 2m), and is fixed at the inner wall of the feeding hopper 2-2 (monitoring static electricity in the static state of the powder), 5cm~10cm below the powder outlet of the feeding hopper 2-2 (monitoring the initial feeding static electricity), 3cm~5cm above the middle section of the powder conveying trough 3-1 (monitoring the static electricity during the conveying process), and 10cm~20cm (15cm) above the end of the powder conveying trough 3-1 (monitoring the final accumulated static electricity). The electrostatic potential sensor 4 is connected to the acquisition industrial control computer (industrial-grade tablet computer, equipped with i5 processor) via a data cable.

[0149] The aforementioned industrial control computer connects to the electrostatic potential sensor 4 via a USB data interface, sampling at a frequency of 10-100Hz, storing electrostatic potential data in real time and synchronously transmitting it to subsequent systems. The industrial control computer communicates with the data acquisition and analysis workstation of the remote control system via Ethernet. Detailed Implementation Method Nine

[0151] This embodiment is a further description of embodiments three to six or eight. In this embodiment, the electrostatic charge measurement unit includes a first Faraday cylinder 6-1.

[0152] The powder mixing device also includes a receiving mechanism 5;

[0153] The receiving mechanism 5 includes a receiving slide rail 5-1, a telescopic bracket 5-2, and a first mixing weighing sensor 5-3;

[0154] The receiving slide rail 5-1 is fixed to the bottom of the support frame 1;

[0155] One end of the telescopic bracket 5-2 is slidably mounted on the receiving slide rail 5-1, and the other end is fixedly connected to the first Faraday cylinder 6-1;

[0156] The first Faraday cylinder 6-1 can move along the receiving slide rail 5-1 to the lower end of the powder conveying trough 3-1 under the drive of the telescopic support 5-2, and is used to receive the mixed powder and collect the electrostatic charge signal of the mixed powder.

[0157] The first mixing weighing sensor 5-3 is mounted on the telescopic bracket 5-2 and is used to obtain the weight of the mixed powder in the first Faraday cylinder 6-1.

[0158] In this embodiment, such as Figures 1-2 As shown, the powder mixing device also includes a receiving mechanism 5.

[0159] like Figures 1-2 As shown in Figures 6 and 7, in the receiving mechanism 5, the first mixing weighing sensor 5-3 (using an electronic balance with an accuracy of 0.1g and a range of 5kg) is placed on the telescopic bracket 5-2. The first Faraday cylinder 6-1 of the electrostatic charge measurement unit is placed on the first mixing weighing sensor 5-3, with the cylinder opening facing the outlet of the powder conveying trough 3-1 (10cm apart), to receive the conveyed powder. Simultaneously, the first mixing weighing sensor 5-3 collects powder mass data in real time to assist in calculating the actual feeding speed (converted by the ratio of mass change to time).

[0160] The telescopic bracket 5-2 is slidably mounted on the receiving slide rail 5-1 via a sliding mechanism at the bottom. After the angle of the powder conveying trough 3-1 is adjusted, the position of the end of the powder conveying trough 3-1 will change. Therefore, the telescopic bracket 5-2 is needed to drive the first Faraday cylinder 6-1 so that the cylinder opening is directly opposite the outlet of the powder conveying trough 3-1.

[0161] The aforementioned telescopic bracket 5-2 allows the first Faraday cylinder 6-1 to be adjusted vertically within a range of 100mm to 500mm from the bottom of the support frame 1.

[0162] The first Faraday cylinder 6-1 consists of an inner cylinder (diameter 15-20cm, height 20-30cm, preferably diameter 18cm, height 25cm; inner wall made of conductive metal) and an outer cylinder (grounded and insulated from the inner cylinder). The top of the inner cylinder has a funnel-shaped opening, which is directly opposite the outlet of the powder conveying trough 3-1 to ensure that all the powder falls into the inner cylinder.

[0163] The first Faraday cylinder 6-1 should also be connected to a matching electrostatic charge measuring meter to measure the total charge of the powder, and process and analyze it together with the feeding amount data monitored by the first mixing weighing sensor 5-3.

[0164] The aforementioned electrostatic charge measuring meter is connected to the inner cylinder of the first Faraday cylinder 6-1 via a wire. It has a measurement range of 0-20 μC, a resolution of 0.1 nC, and a sampling frequency of 1-10 kHz. It can display and output charge data in real time. The electrostatic charge measuring meter is connected to the RS232 serial port of the data acquisition and analysis workstation of the remote control system for data communication. Detailed Implementation Method Ten

[0166] This embodiment is a further explanation of embodiment eight. In this embodiment, the electrostatic charge measurement unit also includes a second Faraday cylinder 6-2.

[0167] The receiving mechanism 5 also includes a second mixing weighing sensor 5-4;

[0168] The second Faraday cylinder 6-2 is slidably mounted on the receiving slide rail 5-1 and can move along the receiving slide rail 5-1 to the lower end of the powder conveying trough 3-1 to receive the mixed powder and collect the electrostatic charge signal of the mixed powder.

[0169] The second mixing weighing sensor 5-4 is used to obtain the weight of the mixed powder in the second Faraday cylinder 6-2.

[0170] In this embodiment, the specifications of the second Faraday cylinder 6-2 are the same as those of the first Faraday cylinder 6-1. However, the second Faraday cylinder 6-2 cannot be raised or lowered. By setting the relative height of the second Faraday cylinder 6-2 from the ground to 0, it is distinguished from the adjustable height of the first Faraday cylinder 6-1, thus enabling the measurement of different height levels.

[0171] like Figures 1-2 As shown in Figure 6, the second Faraday cylinder 6-2 is fixed on the second mixing weighing sensor 5-4 and is slidably mounted on the receiving slide rail 5-1 via a sliding mechanism. After the angle of the powder conveying trough 3-1 is adjusted, the position of the end of the powder conveying trough 3-1 will change. Therefore, it is necessary to drive the second Faraday cylinder 6-2 through the telescopic bracket 5-2 so that the cylinder opening is directly opposite the outlet of the powder conveying trough 3-1.

[0172] like Figures 8-14 As shown, the present invention should also include a necessary PLC electrical control system.

[0173] The PLC electronic control system has a built-in control program that receives external commands (such as manual operation panel or remote signals) to drive actuators such as height adjustment push rod 2-1, flow regulation valve 2-4, and vibration motor 2-6, so as to achieve precise adjustment of the height position and discharge speed of the feeding hopper 2-2.

[0174] like Figure 7 As shown, the present invention also includes a remote control system for realizing data aggregation and interaction among the various subsystems.

[0175] The aforementioned remote control system specifically includes:

[0176] Signal transmission module: Composed of shielded cable and data interface module (such as USB, Ethernet interface), it connects to the industrial control computer, electrostatic charge measuring meter, mixing weighing sensor and PLC to ensure stable and interference-free data transmission;

[0177] Data acquisition and analysis workstation: It has data aggregation and centralized display functions (such as real-time display of parameters such as electrostatic potential, charge, feeding speed, powder conveying trough 3-1 angle, material type, etc.), and supports local data storage (storage capacity ≥ 1000 sets of test data), providing raw data support for subsequent analysis.

[0178] The data transmission module uses Ethernet or RS serial port shielded twisted pair cable to connect each device. The device remote control software data integration and analysis platform (data analysis software) is installed on the data acquisition and analysis workstation. The interface displays the potential curve of each point, the charge value of the Faraday cylinder, the powder feeding speed and weighing data in real time.

[0179] The PLC control system connects and communicates with the data acquisition and analysis workstation of the remote control system via Ethernet.

[0180] The experiment conducted based on the electrostatic detection device in the powder mixing process of the present invention (taking a material comparison test as an example) is as follows:

[0181] S1. Install the 316 stainless steel hopper and powder conveying trough 3-1, adjust the angle of the powder conveying trough 3-1 to 30° and the length to 1m, and set the valve opening to 50% (corresponding to a feeding speed of 25g / s).

[0182] S2. Start the device, add powder (such as a certain energetic powder) to the upper material hopper 2-2, turn on data acquisition, continuously add material for 5 minutes, and simultaneously record the electrostatic potential, Faraday cylinder charge, and weighing data of the mixing weighing sensor at each point.

[0183] S3. Stop feeding, and lay an anti-static layer of anti-static material on the surface of the mixing weighing sensor and the powder conveying tank 3-1. Keep other parameters unchanged, repeat the test 3 times, and obtain multiple sets of parallel data.

[0184] S4. Export data through the data integration platform, compare the electrostatic potential and charge change curves of the two materials, and analyze the influence of materials on electrostatic accumulation.

[0185] Similarly, complete the test conditions for other antistatic layers or different powder falling speeds, and analyze the charging law and influence law under various conditions.

[0186] This invention can simultaneously collect electrostatic potential (four-point non-contact), charge quantity (Faraday cylinder), powder conveying speed, and cumulative weight of the falling powder, comprehensively reflecting the electrostatic accumulation state under various working conditions and overcoming the limitations of single-parameter monitoring. Furthermore, by adjusting the feeding speed, the 3-1 angle / length of the powder conveying trough, and changing the anti-static layer material, it can simulate complex scenarios in industrial production, ensuring the correlation between experimental data and actual production. It achieves centralized collection and storage of monitoring parameters, process parameters, and powder parameters, providing complete data support for subsequent electrostatic law analysis.

[0187] Among these features, non-contact potential measurement avoids interference with the charged state of the powder, Faraday cylinder-sealed measurement ensures the accuracy of charge data, and the quick-replaceable anti-static layer design improves testing efficiency. Furthermore, all of the above components employ a quick-replacement structure to guarantee testing efficiency.

[0188] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0189] Finally, it should be noted that the above description represents a preferred embodiment of the present invention. It should be pointed out that although preferred embodiments have been described, those skilled in the art, once they understand the basic inventive concept of the present invention, can make various improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. An electrostatic detection device for the feeding process of a powder mixing process, characterized in that, include: A powder mixing device is used to add and mix powders and obtain the weight of the powders; An electrostatic potential measurement unit is set at multiple different positions in the powder conveying path of the powder mixing device to detect the electrostatic potential generated during feeding and conveying. An electrostatic charge measurement unit is installed in the mixing completion area of ​​the powder mixing device to measure the electrostatic charge carried by the mixed powder.

2. The electrostatic detection device during the powder mixing process according to claim 1, characterized in that, The powder mixing device includes a support frame (1) and a feeding device (2). The feeding device (2) includes a height adjustment push rod (2-1), a feeding hopper (2-2), a feeding weighing sensor (2-3), and a flow regulating valve (2-4). The fixed end of the height adjustment push rod (2-1) is fixedly connected to the support frame (1); The moving end of the height adjustment push rod (2-1) is fixedly connected to the feeding hopper (2-2) so as to drive the feeding hopper (2-2) to move up and down relative to the support frame (1); The feeding weighing sensor (2-3) is used to obtain the weight of the powder in the feeding hopper (2-2); The flow regulating valve (2-4) is located at the powder outlet of the feeding hopper (2-2) and is used to regulate the discharge flow rate of the powder.

3. The electrostatic detection device during the powder mixing process according to claim 2, characterized in that, The powder mixing device also includes a conveying device (3); The conveying device (3) includes a powder conveying trough (3-1) and a conveying device mounting frame (3-2); The powder conveying trough (3-1) is fixed to the conveying device mounting bracket (3-2), and one end of the powder conveying trough (3-1) is located directly below the powder outlet of the feeding hopper (2-2). The conveying device mounting bracket (3-2) is mounted on the support frame (1) and can adjust the tilt angle of the powder conveying trough (3-1).

4. The electrostatic detection device during the powder mixing process according to claim 3, characterized in that, The conveying device (3) also includes an angle adjustment mechanism (3-3); The angle adjustment mechanism (3-3) includes an adjustment wheel (3-3-1), an adjustment gear (3-3-2), and an adjustment rack (3-3-3). The conveying device mounting bracket (3-2) is rotatably connected to the support frame (1) via a rotating shaft, and the rotating shaft is perpendicular to the long axis of the powder conveying trough (3-1); The adjusting gear (3-3-2) is rotatably connected to the conveying device mounting bracket (3-2) via a gear shaft, and the gear shaft is parallel to the rotating shaft; The adjusting rack (3-3-3) is an arc-shaped rack with its center on the rotating shaft. The adjusting rack (3-3-3) is fixedly connected to the side wall of the support frame (1) and meshes with the adjusting gear (3-3-2). When the adjusting gear (3-3-2) rotates, it can drive the conveying device mounting bracket (3-2) to rotate around the rotating shaft; The side wall of the support frame (1) is provided with an arc-shaped slot, and the trajectory of the arc-shaped slot matches the movement path of the adjusting wheel (3-3-1). The adjusting wheel (3-3-1) is coaxially and fixedly connected to the adjusting gear (3-3-2) via a connecting shaft passing through the arc-shaped slot.

5. The electrostatic detection device during the powder mixing process according to claim 4, characterized in that, The angle adjustment mechanism (3-3) also includes an angle sensor (3-3-4); The angle sensor (3-3-4) is used to obtain the tilt angle of the powder conveying trough (3-1).

6. The electrostatic detection device during the powder mixing process according to claim 3, characterized in that, The powder conveying trough (3-1) is provided with a length adjustment trough (3-1-1) along its length direction; The conveying device mounting frame (3-2) is equipped with locking components; The locking member passes through the length adjustment groove (3-1-1) and detachably fixes the powder conveying trough (3-1) to the conveying device mounting bracket (3-2) so that the powder conveying trough (3-1) can adjust its position relative to the material outlet of the feeding hopper (2-2) along its length direction.

7. The electrostatic detection device during the feeding process of the powder mixing process according to any one of claims 2 to 6, characterized in that, The inner surfaces of the feeding hopper (2-2) and the powder conveying trough (3-1) that come into contact with the powder are provided with replaceable antistatic layers.

8. The electrostatic detection device during the powder mixing process according to claim 7, characterized in that, The electrostatic potential measurement unit includes at least four electrostatic potential sensors (4); At least one electrostatic potential sensor (4) is disposed on the inner wall of the feeding hopper (2-2); At least one electrostatic potential sensor (4) is installed at the material outlet of the feeding hopper (2-2); At least one electrostatic potential sensor (4) is disposed in the middle section of the powder conveying trough (3-1); At least one electrostatic potential sensor (4) is disposed at the end of the powder conveying trough (3-1).

9. The electrostatic detection device during the feeding process of the powder mixing process according to any one of claims 3 to 6 or 8, characterized in that, The electrostatic charge measurement unit includes a first Faraday cylinder (6-1); The powder mixing device also includes a receiving mechanism (5); The receiving mechanism (5) includes a receiving slide rail (5-1), a telescopic bracket (5-2), and a first mixing weighing sensor (5-3). The receiving slide rail (5-1) is fixed to the bottom of the support frame (1); One end of the telescopic bracket (5-2) is slidably mounted on the receiving slide rail (5-1), and the other end is fixedly connected to the first Faraday cylinder (6-1); The first Faraday cylinder (6-1) can move along the receiving slide rail (5-1) to the lower end of the powder conveying trough (3-1) under the drive of the telescopic bracket (5-2) to receive the mixed powder and collect the electrostatic charge signal of the mixed powder; The first mixing weighing sensor (5-3) is mounted on the telescopic bracket (5-2) to obtain the weight of the mixed powder in the first Faraday cylinder (6-1).

10. The electrostatic detection device during the powder mixing process according to claim 8, characterized in that, The electrostatic charge measurement unit also includes a second Faraday cylinder (6-2). The receiving mechanism (5) also includes a second mixing weighing sensor (5-4). The second Faraday cylinder (6-2) is slidably disposed on the receiving slide rail (5-1) and can move along the receiving slide rail (5-1) to the lower end of the powder conveying trough (3-1) to receive the mixed powder and collect the electrostatic charge signal of the mixed powder; The second mixing weighing sensor (5-4) is used to obtain the weight of the mixed powder in the second Faraday cylinder (6-2).

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