Semi-automatic equipment for high-precision weighing of powder and liquid and weighing method

Abstract

The invention discloses semi-automatic equipment for high-precision weighing of powder and liquid and a weighing method. The equipment comprises a solid feeding assembly (1), a liquid feeding assembly (2), a weighing assembly (3), a control system and a PLC, and the solid feeding assembly (1), the liquid feeding assembly (2), the weighing assembly (3) and the control system are connected with the PLC; the solid feeding assembly (1) and the liquid feeding assembly (2) are used for conveying solid materials and liquid materials into a material container (10) on the weighing assembly (3) respectively, and the weighing assembly (3) is used for weighing the materials. The liquid feeding system, the solid feeding system and the weighing system are organically combined, the technical means of intelligent temperature monitoring, intelligent electrostatic monitoring and an advanced control system are adopted, unmanned weighing is achieved, and the safety and automation of the material weighing process in the chemical industry are comprehensively improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical fine production equipment technology, and in particular relates to a semi-automatic device and weighing method for high-precision weighing of powders and liquids. Background Technology

[0002] In the field of energetic chemical production, the production process typically requires mixing different materials in a certain proportion before further processing. To ensure that the actual application effect of the product is as close as possible to the design theory, this material ratio needs to be very precise. This requires that the weight of the materials used in production be as close as possible to the weight designed in the process. The materials often involve energetic powders and energetic liquids. Due to their inherent properties, these materials have high electrostatic and mechanical sensitivity, and can explode under impact, compression, or sufficient electrostatic strength.

[0003] In actual production, materials are added to the electronic balance container manually. Liquids are added using tools such as droppers, and powders using tools such as spatulas. If too much material is added, it is manually removed from the container until the electronic balance reading matches the target value.

[0004] This production method has many drawbacks, such as:

[0005] (1) Risk of explosive explosion. Manual operation is a process of direct contact with materials. During the weighing process, it is unavoidable to add or subtract materials multiple times. Static electricity from equipment, static electricity from the human body, and impacts caused by improper operation may all cause explosive explosions.

[0006] (2) Risk of deviation in weighing accuracy. In actual production, whether the weighing weight is qualified depends entirely on manual judgment. However, due to factors such as fatigue, operators may make mistakes in manually reading the electronic balance, causing an uncontrollable deviation between the actual weight of the material in the electronic scale and the target weight, which will affect subsequent production and post-production use.

[0007] (3) Risk of material mixing. Due to the complexity of explosive formulations, multiple materials are involved. Currently, actual production relies entirely on manual judgment to determine whether the current material type matches the target. When operators make a mistake and put incompatible materials into the container of the electronic balance, there are no warnings or error messages, and this phenomenon cannot be prevented.

[0008] (4) Occupational hazard risks. The liquid materials required for production are volatile and toxic, such as tris(2-methylaziridine)phosphine oxide, and the powdered materials may also pose a risk of dust inhalation pollution. The repeated addition and subtraction of materials during weighing undoubtedly increases the harm to the health of operators. Summary of the Invention

[0009] The purpose of this invention is to provide a semi-automatic device and weighing method for high-precision weighing of powders and liquids to overcome the shortcomings of traditional manual weighing devices in terms of safety, weighing accuracy and stability.

[0010] The technical solution adopted in this invention is:

[0011] A semi-automatic device for high-precision weighing of powders and liquids includes a solid feeding assembly, a liquid feeding assembly, a weighing assembly, a control system, and a PLC, wherein the solid feeding assembly, the liquid feeding assembly, the weighing assembly, and the control system are respectively connected to the PLC;

[0012] The solid feeding assembly and the liquid feeding assembly are used to convey solid materials and liquid materials to the material container on the weighing assembly, respectively, and the weighing assembly is used to weigh the materials.

[0013] Furthermore, the solid feeding assembly includes an electromagnetic vibratory feeder, a feeding hopper, a solid feeding platform, an electrostatic detection rod, and an electrostatic monitoring sensor;

[0014] The electromagnetic vibrating feeder and the feeding hopper are fixed on the solid feeding platform. The electrostatic detection rod is set in the middle of the hopper cover of the feeding hopper and inserted into the powder inside the feeding hopper. The electrostatic monitoring sensor is fixed on the back of the solid feeding platform.

[0015] Furthermore, the solid feeding assembly also includes a solid feeding platform base, a clamp, a nylon guide block, a grounding wire, and four stainless steel feet.

[0016] The solid feed platform base is located at the bottom of the solid feed platform. The four stainless steel foot cups are located at the four corners of the bottom of the solid feed platform base. The electrostatic detection rod is locked to the hopper cover of the feed hopper by the clamp. The nylon guide block is provided between the electrostatic detection rod and the hopper cover of the feed hopper so that the static electricity in the powder in the feed hopper can be conducted into the electrostatic monitoring sensor. The grounding wire is provided at the corner of the solid feed platform.

[0017] Furthermore, the liquid feeding assembly includes a peristaltic pump, a liquid feeding platform, an inlet container, and a silicone tube. The peristaltic pump and the inlet container are located on the liquid feeding platform. The liquid material is contained in the inlet container. The inlet container is connected to the peristaltic pump through a delivery pipe. The peristaltic pump is connected to the liquid container on the weighing system through a silicone tube.

[0018] Furthermore, the liquid feeding assembly also includes a liquid feeding platform base, an adjustable bracket, a test tube clamp, a temperature sensor, a temperature sensing transition block, and a mounting plate. The liquid feeding platform base is located at the bottom of the liquid feeding platform, the mounting plate is fixed to the side of the liquid feeding platform, the temperature sensing transition block is installed on the back of the peristaltic pump, the temperature sensor is fixed to the mounting plate, the probe of the temperature sensor is fixedly connected to the temperature sensing transition block, the test tube clamp is installed on the adjustable bracket, and the end of the silicone tube is clamped in the test tube clamp.

[0019] Furthermore, the weighing assembly includes an electronic balance, a weighing tray, and an electronic balance platform. The electronic balance is located on the electronic balance platform, the weighing tray is located on the electronic balance, the weighing tray is used to place material containers, and the adjustable bracket is located on the electronic balance platform.

[0020] Furthermore, the weighing assembly also includes four weighing limit blocks, a tray anti-error plate, and an electronic balance base. The electronic balance base is located at the bottom of the electronic balance, the four weighing limit blocks are located on the electronic balance and are set at the bottom of the four corners of the electronic balance, and the tray anti-error plate is located on one side of the electronic balance and connected to the electronic balance.

[0021] Furthermore, the device also includes an explosion-proof touch screen and a weighing display instrument, which are mounted on an electronic balance platform. The explosion-proof touch screen is used to display the device's operating status or alarms, and the weighing display instrument is used to display the reading of the electronic balance.

[0022] Furthermore, the explosion-proof touch screen is equipped with a three-color light on the top, an explosion-proof touch screen in the middle, and a physical button below the explosion-proof touch screen.

[0023] A weighing method based on the aforementioned semi-automatic equipment for high-precision weighing of powders and liquids, wherein the weighing includes powder weighing and liquid weighing, and during powder weighing, the powder feeding of the electromagnetic vibrating feeder is divided into two stages: fast and slow. 1. After starting the weighing program, the feed is fast, and before reaching 90%-5g of the target weighing value, the amplitude of the fast feeding stage is 0.7mm-1.2mm; 2. After the fast feeding stage, the amplitude is adjusted to 0.1mm-0.3mm for slow feeding; 3. When the distance to the target weighing value is 0.05g-2.00g, the machine is stopped immediately, and the powder floating in the air falls into the material container after stopping, thus reaching the target weighing value.

[0024] When weighing liquids, the peristaltic pump feeds liquids in three stages: fast, medium, and slow. 1. After starting the weighing program, feed rapidly at a speed of 100-250 rpm. This rapid feeding stage is before reaching 90% of the target weighing value (5g). 2. After the rapid feeding stage ends, before reaching 98% of the target weighing value (2g), adjust the speed to medium, at 5-10 rpm. 3. After the medium-speed feeding stage, adjust the speed to slow, at 0.1-1 rpm. 4. When the target weighing value is reached, immediately adjust the pump head rotation to 0.1-1 rpm, and stop rotating after 1-5 seconds of back suction to prevent liquid dripping.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] (1) This invention organically combines a liquid feeding system, a solid feeding system and a weighing system, and adopts a series of technical means such as intelligent temperature monitoring, intelligent electrostatic monitoring and advanced control system to propose an innovative semi-automatic device for high-precision weighing of powders and liquids, realizing unmanned weighing process and comprehensively improving the safety and automation of material weighing process in chemical industry.

[0027] (2) The present invention specifically provides weighing methods for powder weighing and liquid weighing. For different weighing stages, combined with different weighing values, process parameters such as rotation speed and amplitude are designed in detail to ensure the feeding cycle of powder and liquid, while also ensuring the powder feeding accuracy, which greatly improves the accuracy of weighing results.

[0028] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the semi-automatic equipment for high-precision weighing of powders and liquids according to the present invention;

[0030] Figure 2 This is a schematic diagram of the solid feeding assembly structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the liquid feeding assembly and weighing assembly of the present invention;

[0032] Figure 4 This is a schematic diagram of the explosion-proof touchscreen of the present invention. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0034] Combination Figure 1A semi-automatic device for high-precision weighing of powders and liquids includes a solid feeding assembly 1, a liquid feeding assembly 2, a weighing assembly 3, a control system and a PLC, wherein the solid feeding assembly 1, the liquid feeding assembly 2, the weighing assembly 3 and the control system are respectively connected to the PLC;

[0035] The solid feeding assembly 1 and the liquid feeding assembly 2 are used to convey solid materials and liquid materials to the material container 10 on the weighing assembly 3, respectively. The weighing assembly 3 is used to weigh the materials.

[0036] Combination Figure 2 The feeding drive mechanism of the solid feeding assembly 1 is an electromagnetic vibrating feeder 101. Its feeding hopper 102 is fixed on the solid feeding platform 103, which is made of stainless steel with a brushed surface, providing a significant contrast in appearance with the powder and facilitating observation of powder accumulation. The electromagnetic vibrating feeder 101 is locked to the solid feeding platform 103. The bolt holes on the platform are slotted, allowing for adjustment of the machine's position to match the feeding hopper 102. The solid feeding platform 103 is also locked to the solid feeding platform base 104 to reduce dust accumulation caused by dents or gaps in the bolts and threads on the platform. An electrostatic detection rod 105 is installed in the center of the hopper cover of the feeding hopper 102, inserted into the powder inside the hopper 102, for real-time monitoring of electrostatic accumulation within the powder. The static electricity detection rod 105 is vertically locked and limited by a clamp 106. An insulated nylon guide block 107 is installed between it and the hopper cover to ensure that the static electricity in the powder in the hopper can be completely guided into the static electricity monitoring sensor 108 installed on the back of the solid feed platform 103 for real-time monitoring of static electricity accumulation during powder feeding. A grounding wire 109 is installed at the corner of the solid feed platform 103 to ensure reliable grounding of the equipment and prevent static electricity accumulation in the main body of the equipment. Four stainless steel feet 110 at the bottom of the equipment base are fixed to the threaded holes at the bottom of the four legs of the equipment base through their own threads. The height is adjustable to ensure that the four corners are stable and the platform is level.

[0037] Combination Figure 3 The liquid feeding platform base 201 is placed behind the electronic balance platform base 202. The peristaltic pump 203 is placed directly on the liquid feeding platform 204, with the incoming material container 205 placed beside it. The medium is transmitted through a silicone tube 206 dedicated to the peristaltic pump. The silicone tube has an inner diameter of 4.8 mm, an outer diameter of 9.9 mm, and a length of approximately 1 m, depending on the specific situation. When weighing is started, the medium is extruded from the incoming material container 205, squeezed and conveyed by the peristaltic pump 203, and exits from the end of the silicone tube held by the test tube clamp 208 on the adjustable bracket 207, finally entering the liquid container 210 on the weighing tray 209.

[0038] The peristaltic pump 203 is equipped with a temperature sensor 211. For example... Figure 3As shown, the copper temperature-sensing transition block 212 on the back of the peristaltic pump 203 is installed using the existing mounting holes of the peristaltic pump 203 and is fixed with bolts. This allows for real-time monitoring of the peristaltic pump temperature without damaging the internal structure or explosion-proof performance of the peristaltic pump 203. The probe of the temperature sensor 211 is fixed to the temperature-sensing transition block 212 with bolts, and its body is fixed to the mounting plate 213 with bolts. The mounting plate 213 is fixed to the side of the D-platform 204 with bolts.

[0039] The peristaltic pump 203 communicates with the PLC via an RS-485 interface. The PLC communicates with the peristaltic pump 203 via the Modbus RTU protocol. Signals are provided by existing programs or a touch screen to control the start, stop, speed, and direction of the peristaltic pump.

[0040] Four weighing limit blocks 214 are connected to the electronic balance platform 217 by bolts. These four limit blocks 214 are placed at the four corners of the electronic balance 215 for positioning, and are also connected to the electronic balance platform 217 by bolts. A weighing tray 209 with anti-error features is placed on the electronic balance 215. The weighing tray 209 is made of conductive nylon and can conduct static electricity from the powder inside the container through the surface of the electronic balance platform 217. The bottom of the weighing tray 209 has a recessed feature that matches the surface of the electronic balance 215 for positioning. An adjustable tray anti-error plate 216 with a waist-shaped groove is located on the left side of the electronic balance 215 and is connected to the electronic balance platform 217 by bolts to prevent incorrect placement of the weighing tray 209. The electronic balance platform 217 is connected to the electronic balance platform base 202 by bottom-locking bolts to reduce dust accumulation caused by dents or gaps in the bolts and threads.

[0041] The weighing pallet 209 features two sets of laser-marked lettering. The larger marking at the center of the placement area provides visual guidance during manual container placement. The smaller marking on the side allows for verification after container placement. The weighing pallet's positioning and error-proofing measures, both internally and externally, restrict the container's position, ensuring the correctness of the materials inside the container at a physical level.

[0042] This weighing equipment comprises a weighing system, a feeding system, and a control system (including a remote control HMI and a local control HMI), all interconnected via a PLC. In the feeding system, the start / stop or amplitude adjustment of the electromagnetic vibrating feeder is controlled by data obtained from the electronic balance 215 or set data input into the explosion-proof touchscreen 62, which is then processed by the PLC to issue control signals. The electromagnetic vibrating feeder, peristaltic pump, temperature sensor, electrostatic monitoring sensor, and remote control HMI are all interconnected via the PLC. The remote control HMI can set weighing program parameters, issue program start / stop commands, and display equipment status.

[0043] The electronic balance 215 has a weighing range of 3000g and an accuracy of 0.1g. The electronic balance 215 is connected to its display terminal via a dedicated cable and grounded. The display terminal outputs digital signals and communicates with the PLC via an RS-485 interface. The electronic balance 215 is equipped with a remote control console; the remote control HMI on the console can remotely start the weighing program, achieving unmanned operation of the relatively most dangerous weighing process. The aforementioned weighing component 3 is independent of the base of the feeding system equipment for the two materials, avoiding the influence of symmetrical readings caused by vibrations of the feeding system, or the mutual influence caused by vibrations of the two feeding systems.

[0044] The electromagnetic vibrating feeder 101 feeds back its operating status (start and stop status) to the PLC via a DC24V signal. The PLC controls its start and stop via a digital switch and controls the amplitude of the electromagnetic vibrating feeder 101 via a 4-20mA analog current signal. To avoid equipment resonance, the vibration frequency of the electromagnetic vibrating feeder 101 is factory-calibrated and locked at 50Hz. The amplitude is adjustable from 0-1.2mm.

[0045] The electrostatic discharge (ESD) sensor 105 attached to the electromagnetic vibrating feeder 101 communicates with the PLC via RS485, and can feed back the measured ESD voltage value to the PLC in real time. The PLC then outputs a signal and displays the value on the screen. When the monitored value exceeds the set safety threshold, the PLC can issue a stop command to the electromagnetic vibrating feeder 101.

[0046] The explosion-proof touch screen 6 is connected to the PLC via the PROFINET bus. It can set the weighing target value and display equipment information, such as the internal electrostatic quantity (voltage) of the powder, the amplitude of the electromagnetic vibrating feeder, the weighing reading, etc., and can control the start and stop of the automated weighing process.

[0047] Combination Figure 1 The device also includes an explosion-proof touch screen 6, a riser 7, and a weighing display instrument 9. The explosion-proof touch screen 6 and the weighing display instrument 9 are mounted on the electronic balance platform 217, in conjunction with... Figure 4 The explosion-proof touch screen 6 is used to display the operating status of the equipment or alarms. The weighing display instrument 9 is used to display the reading of the electronic balance 215. The explosion-proof touch screen 6 is equipped with a three-color light 61 on the top and an explosion-proof touch screen 62 in the middle. A physical button 63 is provided below the explosion-proof touch screen 62, including functions such as program start, stop, emergency stop, and reset. The material container 10 for holding different materials is placed on the shelf 11 below the electronic balance.

[0048] The liquid feeding system of this invention uses an explosion-proof peristaltic pump as its conveying device and is equipped with a temperature sensor to monitor the surface temperature of the peristaltic pump, thus expanding the applicability of the peristaltic pump: when the application scenario limits the temperature threshold of the peristaltic pump to a low level, the explosion-proof rating of the peristaltic pump itself may not meet the requirements for safety reasons. The added temperature sensor can be set with an alarm threshold, and when the temperature of the peristaltic pump reaches the set threshold, it can preemptively shut down the pump. The control logic of the peristaltic pump of this invention is as follows: liquid feeding is divided into three stages: fast, medium, and slow. 1. After starting the weighing program, fast feeding is performed at a speed of 100 rpm to 250 rpm during the fast feeding stage (before reaching 90% of the target weighing value - 5g). 2. After the fast feeding stage ends and before reaching 98% of the target weighing value - 2g, the speed is adjusted to medium feeding at 5 rpm to 10 rpm. 3. After the medium-speed feeding stage, the speed is adjusted to switch to slow feeding at 0.1 rpm to 1 rpm. 4. When the target weighing value is reached, the pump head direction is immediately adjusted to 0.1 rpm to 1 rpm, and the pump stops rotating after 1 to 5 seconds of back suction to avoid liquid dripping. The feeding accuracy can reach ±0.045g, and the overall feeding speed can reach 500g / min.

[0049] The solid feeding system of this invention uses an electromagnetic vibrating feeder as its conveying device. An electrostatic monitoring sensor is installed in the middle of the feeder hopper, while the sensor itself is located on the side of the platform. The electrostatic monitoring sensor can monitor the accumulation of static electricity in the powder in real time during the feeding process and can set a threshold; if the threshold is exceeded, the machine will stop and alarm. Both the hopper and the feeding trough are coated with a PTFE antistatic coating to minimize static electricity generated by friction between the powder and the inner wall of the equipment. The electromagnetic vibrating feeder has an adjustable amplitude. The control logic is as follows: powder feeding is divided into two stages: fast and slow. 1. After starting the weighing program, feed rapidly until reaching 90% of the target weighing value (before 5g), with an amplitude of 0.7mm to 1.2mm. 2. After the fast feeding stage, adjust the amplitude for slow feeding, with an amplitude of 0.1mm to 0.3mm. 3. When the distance to the target weighing value is 0.05g to 2.00g (flying value), stop the machine immediately. After stopping, the powder floating in the air falls into the weighing container, thus reaching the target weighing value. 4. The flying value needs to be determined by testing specific target materials. The feeding accuracy can reach ±0.01g.

[0050] This invention allows for manual, one-time feeding of materials into a hopper or bin, followed by remote initiation of the weighing program. A high-precision feeding device, a peristaltic pump, and an electromagnetic vibrating feeder deliver the materials to the corresponding container on an electronic balance (the container is equipped with error-proofing features), thus automating and unmanning the weighing process. This ensures personnel safety while guaranteeing weighing accuracy and the correct material type.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A semi-automatic device for high-precision weighing of powders and liquids, characterized in that, It includes a solid feeding assembly (1), a liquid feeding assembly (2), a weighing assembly (3), a control system and a PLC, wherein the solid feeding assembly (1), the liquid feeding assembly (2), the weighing assembly (3) and the control system are respectively connected to the PLC; The solid feeding assembly (1) and the liquid feeding assembly (2) are used to convey solid materials and liquid materials to the material container (10) on the weighing assembly (3), and the weighing assembly (3) is used to weigh the materials.

2. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 1, characterized in that, The solid feeding assembly (1) includes an electromagnetic vibrating feeder (101), a feeding hopper (102), a solid feeding platform (103), an electrostatic detection rod (105), and an electrostatic monitoring sensor (108). The electromagnetic vibrating feeder (101) and the feeding hopper (102) are fixed on the solid feeding platform (103). The electrostatic detection rod (105) is set in the middle of the hopper cover of the feeding hopper (102) and inserted into the powder in the feeding hopper (102). The electrostatic monitoring sensor (108) is fixed on the back of the solid feeding platform (103).

3. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 2, characterized in that, The solid feeding assembly (1) also includes a solid feeding platform base (104), a clamp (106), a nylon guide block (107), a grounding wire (109), and four stainless steel feet (110). The solid feeder base (104) is located at the bottom of the solid feeder (103). The four stainless steel foot cups (110) are located at the four corners of the bottom of the solid feeder base (104). The electrostatic detection rod (105) is locked and limited to the hopper cover of the feed hopper (102) by the clamp (106). The nylon guide block (107) is provided between the electrostatic detection rod (105) and the hopper cover of the feed hopper (102) so that the static electricity in the powder in the feed hopper (102) can be introduced into the electrostatic monitoring sensor (108). The grounding wire (109) is provided at the corner of the solid feeder (103).

4. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 2 or 3, characterized in that, The liquid feeding assembly (2) includes a peristaltic pump (203), a liquid feeding platform (204), a material inlet container (205), and a silicone tube (206). The peristaltic pump (203) and the material inlet container (205) are located on the liquid feeding platform (204). The liquid material is loaded into the material inlet container (205). The material inlet container (205) is connected to the peristaltic pump (203) through a conveying pipe. The peristaltic pump (203) is connected to the liquid container (210) on the weighing system through the silicone tube (206).

5. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 4, characterized in that, The liquid feeding assembly (2) also includes a liquid feeding platform base (201), an adjustable bracket (207), a test tube clamp (208), a temperature sensor (211), a temperature sensing transition block (212), and a mounting plate (213). The liquid feeding platform base (201) is located at the bottom of the liquid feeding platform (204). The mounting plate (213) is fixed to the side of the liquid feeding platform (204). The temperature sensing transition block (212) is installed on the back of the peristaltic pump (203). The temperature sensor (211) is fixed to the mounting plate (213). The probe of the temperature sensor (211) is fixedly connected to the temperature sensing transition block (212). The test tube clamp (208) is installed on the adjustable bracket (207). The end of the silicone tube (206) is clamped in the test tube clamp (208).

6. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 5, characterized in that, The weighing assembly (3) includes an electronic balance (215), a weighing tray (209), and an electronic balance platform (217). The electronic balance (215) is located on the electronic balance platform (217), the weighing tray (209) is located on the electronic balance (215), the weighing tray (209) is used to place the material container (10), and the adjustable bracket (207) is located on the electronic balance platform (217).

7. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 6, characterized in that, The weighing assembly (3) also includes four weighing limit blocks (214), a tray anti-error plate (216), and an electronic balance base (202). The electronic balance base (202) is located at the bottom of the electronic balance (217). The four weighing limit blocks (214) are located on the electronic balance (217) and set at the bottom of the four corners of the electronic balance (215). The tray anti-error plate (216) is located on one side of the electronic balance (215) and connected to the electronic balance (217).

8. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 7, characterized in that, The device also includes an explosion-proof touch screen (6) and a weighing display instrument (9), which are mounted on an electronic balance platform (217). The explosion-proof touch screen (6) is used to display the device's operating status or alarm, and the weighing display instrument (9) is used to display the reading of the electronic balance (215).

9. The semi-automatic equipment for high-precision weighing of powders and liquids according to claim 8, characterized in that, The explosion-proof touch screen (6) is equipped with a three-color light (61) on the top, an explosion-proof touch screen (62) in the middle, and a physical button (63) below the explosion-proof touch screen (62).

10. The weighing method of a semi-automatic device for high-precision weighing of powders and liquids according to any one of claims 4 to 9, characterized in that, The weighing includes powder weighing and liquid weighing. When weighing powder, the electromagnetic vibrating feeder (101) feeds powder in two stages: fast and slow.

1. After starting the weighing program, feed rapidly until the target weighing value of 90%-5g is reached. During the fast feeding stage, the amplitude is 0.7mm-1.2mm.

2. After the fast feeding stage, adjust the amplitude to 0.1mm-0.3mm and feed slowly.

3. When the target weighing value is 0.05g-2.00g away, stop the machine immediately. After stopping the machine, the powder floating in the air falls into the material container (10), and the target weighing value is reached. When weighing liquid, the peristaltic pump (203) feeds liquid in three stages: fast, medium, and slow.

1. After starting the weighing program, feed quickly at a speed of 100 rpm to 250 rpm. The fast feeding stage is before reaching 90% to 5g of the target weighing value.

2. After the fast feeding stage ends and before reaching 98% to 2g of the target weighing value, adjust the speed to medium feeding at 5 rpm to 10 rpm.

3. After the medium feeding stage, adjust the speed to slow feeding at 0.1 rpm to 1 rpm.

4. When the target weighing value is reached, immediately adjust the pump head rotation at 0.1 rpm to 1 rpm. After 1 to 5 seconds of back suction, stop rotating to avoid liquid dripping.

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