Full-automatic PLC dosing device

Abstract

The invention relates to the technical field of chemical machinery, and particularly discloses a full-automatic PLC dosing device which comprises an equipment frame, a storage tank and a metering unit are arranged in the equipment frame, a first gear pump is arranged at the lower end of the storage tank, the input end of the first gear pump communicates with the storage tank, and the output end of the first gear pump is connected with a feeding pipe; the other end of the feeding pipe is arranged in the metering unit; the metering unit comprises a first measuring assembly, a second measuring assembly is arranged at the upper end of the first measuring assembly, metering cylinders are arranged on the outer walls of the first measuring assembly and the second measuring assembly, and a second gear pump is arranged at the lower end of the first measuring assembly; meanwhile, whether an instrument breaks down or not can be detected, automatic cooperation is achieved, manual intervention is reduced, personal errors in the manual operation process are avoided, and the accuracy and consistency of the agent adding amount are improved.

Description

Technical Field

[0001] This invention relates to the field of chemical machinery technology, and in particular to a fully automatic PLC dosing device. Background Technology

[0002] Currently, the addition of highly viscous and corrosive liquids is an important issue in fields such as engineering construction, chemical industry, food, wastewater treatment, and pharmaceuticals. Common dosing devices determine the dosage by weighing or volume measurement.

[0003] However, in existing technologies, the weighing method has a complex structure, and the use of flexible hoses leads to low measurement accuracy. Volume measurement usually uses a metering pump, which is prone to wear and tear after long-term use, resulting in insufficient measurement accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a fully automatic PLC dosing device, which aims to solve the technical problems of existing weighing methods having complex structures and low metering accuracy due to the use of hose connections, and volume measurement usually using metering pumps, which are prone to wear after long-term use, resulting in insufficient metering accuracy.

[0005] To achieve the above objectives, the present invention employs a fully automatic PLC dosing device, comprising an equipment frame, wherein a storage tank and a metering unit are provided inside the equipment frame, a first gear pump is provided at the lower end of the storage tank, the input end of the first gear pump is connected to the storage tank, the output end of the first gear pump is connected to a feed pipe, and the other end of the feed pipe is located inside the metering unit. The metering unit includes a first measuring component, a second measuring component at the upper end of the first measuring component, a metering cylinder on the outer wall of the first measuring component and the second measuring component, and a second gear pump at the lower end of the first measuring component.

[0006] The first measuring component includes a first measuring cylinder, the lower end of which is provided with multiple sets of first support legs, the lower end of which is provided with a first discharge pipe, the upper end of which is provided with a measuring cover, the upper end of which is provided with two sets of first radar level gauges, and the upper end of which is provided with multiple sets of second measuring modules.

[0007] Each of the second measurement modules includes a guide cylinder, inside which a weight sensor is installed, and on the inner side of the guide cylinder is a linear bearing.

[0008] The second measuring component includes a second measuring cylinder, the lower end of which is provided with an electromagnetic butterfly valve, the lower end of which is provided with a second discharge pipe, and the lower end of the second measuring cylinder is provided with multiple sets of metering feet, each set of metering feet being provided with a rubber pad at its lower end.

[0009] The metering unit further includes multiple sets of connecting components, which are respectively disposed on the outer walls of the first measuring component and the second measuring component.

[0010] Each of the connecting components includes a first connecting lug, a first connecting rod on the inner side of the first connecting lug, a connecting screw at one end of the first connecting rod, a knob ring on the outer wall of the connecting screw, a second connecting rod at the end of the connecting screw away from the first connecting rod, and a second connecting lug on the outer wall of the second connecting rod.

[0011] The feed pipe includes a pipe body, the output end of which is equipped with a one-way valve, and the input end of which is connected to the output end of the first gear pump.

[0012] The tube body includes an outer tube, and the inner wall of the outer tube is provided with a microporous ceramic inner tube. The inner wall of the microporous ceramic inner tube is provided with multiple sets of buffer protrusions, and the inner wall of the microporous ceramic inner tube is also provided with multiple sets of porous protective plates. Each set of porous protective plates is respectively set at the bend of the microporous ceramic inner tube.

[0013] The measuring cylinder includes a cylinder body, the lower end of which is provided with multiple sets of second support legs, and the upper end of which is hinged to a cylinder cover, which covers the cylinder body.

[0014] The storage tank includes a tank body, the lower end of which is provided with multiple sets of third support legs, the upper end of which is provided with a tank cover, and the upper end of which is provided with two sets of second radar level gauges.

[0015] The fully automatic PLC dosing device of the present invention has the following beneficial effects: 1. The volume and mass of the medicine are measured in a linked manner by the first measuring component and the second measuring component. First, the mass of the medicine is measured. After confirming the mass, the medicine is introduced into the first measuring component for volume measurement. The amount of medicine to be added is calculated in a linked manner by the density of the medicine. The volume is calculated from the mass, and then the mass is calculated from the volume. This linked measurement improves the accuracy and reliability of medicine addition and can also check whether the instrument is malfunctioning. 2. By measuring both volume and mass, the dosage is determined, achieving automated mixing, reducing manual intervention, avoiding human error during manual operation, and improving the accuracy and consistency of the dosage. 3. The first gear pump pumps the medicine from the storage tank into the metering unit for measurement. After verifying that the dosage of medicine added by the pump is correct, the second gear pump pumps the medicine into the mixing equipment. This ensures the accuracy of medicine addition, prevents direct addition into the mixing equipment, and avoids errors in medicine addition that cannot be effectively corrected. 4. By using multiple sets of radar level gauges for measurement, the real-time liquid level of the agent can be read, and it can also prevent the agent from being over-added and overflowing, further improving the reliability of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a fully automatic PLC dosing device according to the present invention.

[0018] Figure 2 This is a cross-sectional view of the internal structure of a fully automatic PLC dosing device according to the present invention.

[0019] Figure 3 This is the invention Figure 2 Enlarged view of the local structure at point A.

[0020] Figure 4 This is the invention Figure 2 Enlarged view of the local structure at point B.

[0021] Figure 5 This is a partial structural cross-sectional view of a fully automatic PLC dosing device according to the present invention.

[0022] Figure 6 This is a schematic diagram of the porous protective plate of the present invention.

[0023] 1-Equipment frame, 2-First gear pump, 3-Feed pipe, 4-Second gear pump, 5-First measuring cylinder, 6-First support leg, 7-First discharge pipe, 8-Measuring cover, 9-First radar level gauge, 10-Guide cylinder, 11-Weight sensor, 12-Linear bearing, 13-Second measuring cylinder, 14-Solenoid butterfly valve, 15-Second discharge pipe, 16-Metering foot column, 17-Rubber pad, 18-First connecting lug, 19-First connecting rod, 20-Connecting screw, 21-Knob ring, 22-Second connecting rod, 23-Second connecting lug, 24-One-way valve, 25-Outer pipe, 26-Microporous ceramic inner pipe, 27-Buffer protrusion, 28-Porous protective plate, 29-Cylinder body, 30-Second support leg, 31-Cylinder cover, 32-Tank body, 33-Third support leg, 34-Tank cover, 35-Second radar level gauge. Detailed Implementation

[0024] Please see Figures 1 to 6 , Figure 1 This is a schematic diagram of the structure of a fully automatic PLC dosing device according to the present invention; Figure 2 This is a cross-sectional view of the internal structure of a fully automatic PLC dosing device according to the present invention; Figure 3 This is the invention Figure 2 Enlarged view of the local structure at point A; Figure 4 This is the invention Figure 2 Enlarged view of the local structure at point B; Figure 5 This is a partial structural cross-sectional view of a fully automatic PLC dosing device according to the present invention; Figure 6 This is a schematic diagram of the porous protective plate of the present invention.

[0025] The present invention provides a fully automatic PLC dosing device, including a device frame 1. The device frame 1 is provided with a storage tank and a metering unit inside. The lower end of the storage tank is provided with a first gear pump 2. The input end of the first gear pump 2 is connected to the storage tank. The output end of the first gear pump 2 is connected to a feed pipe 3. The other end of the feed pipe 3 is located inside the metering unit. The metering unit includes a first measuring component, a second measuring component at the upper end of the first measuring component, a metering cylinder on the outer wall of the first measuring component and the second measuring component, and a second gear pump 4 at the lower end of the first measuring component.

[0026] In this embodiment, the storage tank and the metering unit are mounted on the equipment rack 1, forming an integral structure consisting of the storage tank, the metering unit, the first gear pump 2, and the supply pipe 3. During use, the storage tank stores the medicine. When medicine needs to be added, the first gear pump 2 is activated, pumping the medicine from the storage tank into the metering unit via the first gear pump 2 and the supply pipe 3. After being pumped into the metering unit, the medicine preferentially falls into the second measuring component, where the first measuring component measures the increase in mass. The increased mass is the basis of the measurement. The first gear pump 2 stops pumping the added agent, and the final added mass is determined. Then, the agent in the second measuring component is introduced into the first measuring component, and the added volume of the agent is measured by the first measuring component. The volume of the agent measured by the first measuring component is compared with the agent mass × agent density measured by the second measuring component. When the difference is within the error range preset by the administrator, it is determined that the amount of agent added meets the addition standard. The accuracy of agent addition is ensured by dual verification of mass and volume. Finally, the confirmed added agent is pumped into the mixing equipment by the second gear pump 4.

[0027] Furthermore, the first measuring component includes a first measuring cylinder 5, the lower end of the first measuring cylinder 5 is provided with multiple sets of first support legs 6, the lower end of the first measuring cylinder 5 is provided with a first discharge pipe 7, the upper end of the first measuring cylinder 5 is provided with a measuring cover 8, the upper end of the measuring cover 8 is provided with two sets of first radar level gauges 9, and the upper end of the measuring cover 8 is provided with multiple sets of second measuring modules.

[0028] In this embodiment, the agent enters the first measuring cylinder 5, which is supported and fixed by multiple sets of first support legs 6. The measuring cover 8 is provided at the upper end of the first measuring cylinder 5, and the measuring cover 8 is used to install and fix two sets of first radar level gauges 9 and multiple sets of second measuring modules. Among the two sets of first radar level gauges 9, one set of first radar level gauges 9 is used to monitor the maximum height of the agent. When the maximum height of the first measuring cylinder 5 is reached, the agent introduction of the second measuring component is stopped to prevent excessive overflow of the agent from the first measuring cylinder 5. The other set of first radar level gauges 9 is used to measure the liquid level height of the agent in real time. The agent addition volume in the first measuring cylinder 5 is calculated based on the liquid level height of the agent. The multiple sets of second measuring modules are used to measure the mass change value of the second measuring component. After confirming the amount of agent added, the first discharge pipe 7, in conjunction with the second gear pump 4, pumps the agent to the stirring device.

[0029] Furthermore, each group of the second measurement modules includes a guide cylinder 10, inside which a weight sensor 11 is provided, and on the inner side of the guide cylinder 10 a linear bearing 12 is provided.

[0030] In this embodiment, the guide cylinder 10 positions and guides the second measuring component. At the same time, the linear bearing 12 further improves the lubrication between the guide cylinder 10 and the second measuring component. The weight sensor 11 weighs the second measuring component at its upper end. The linear bearing 12 can prevent jamming during the weighing process and improve the accuracy of weighing the drug.

[0031] Furthermore, the second measuring component includes a second measuring cylinder 13, the lower end of the second measuring cylinder 13 is provided with an electromagnetic butterfly valve 14, the lower end of the electromagnetic butterfly valve 14 is provided with a second discharge pipe 15, the lower end of the second measuring cylinder 13 is provided with multiple sets of metering feet 16, and the lower end of each set of metering feet 16 is provided with a rubber pad 17.

[0032] In this embodiment, the pumped medicine is loaded into the second measuring cylinder 13, and the lower end of the second measuring cylinder 13 is sealed by the electromagnetic butterfly valve 14. The second measuring cylinder 13 is supported by multiple sets of metering feet 16, and each set of metering feet 16 is embedded in the guide cylinder 10 and the linear bearing 12. The rubber pad 17 is in contact with the upper end of the weight sensor 11. When the medicine is added into the second measuring cylinder 13, the weight sensor 11 is compressed. The total mass of the added medicine is calculated by summing the weights of the multiple sets of weight sensors 11. After the required total mass of medicine is reached, the first gear pump 2 stops pumping the medicine, and then the electromagnetic butterfly valve 14 is opened so that the medicine is introduced into the first measuring component through the electromagnetic butterfly valve 14 and the second discharge pipe 15.

[0033] Furthermore, the measuring unit also includes multiple sets of connecting components, which are respectively disposed on the outer walls of the first measuring component and the second measuring component.

[0034] In this embodiment, the first measuring component and the second measuring component are connected by multiple sets of connecting components to ensure the stability between the first measuring component and the second measuring component. This prevents the measuring foot column 16 from detaching from or deviating from the guide cylinder 10 during operation and use, and effectively limits the position of the measuring foot column 16.

[0035] Furthermore, each of the connecting components includes a first connecting lug 18, a first connecting rod 19 is provided on the inner side of the first connecting lug 18, a connecting screw 20 is provided at one end of the first connecting rod 19, a knob ring 21 is provided on the outer wall of the connecting screw 20, a second connecting rod 22 is provided at the end of the connecting screw 20 away from the first connecting rod 19, and a second connecting lug 23 is provided on the outer wall of the second connecting rod 22.

[0036] In this embodiment, the first connecting lug 18 is disposed on the outer wall of the second measuring cylinder 13, and the second connecting lug 23 is disposed on the outer wall of the first measuring cylinder 5. During installation, the first connecting rod 19 passes through the first connecting lug 18, and the second connecting rod 22 passes through the second connecting lug 23, so that the end of the connecting screw 20 contacts the end of the second connecting rod 22, and the end of the connecting screw 20 and the end of the second connecting rod 22 are threaded together, thereby limiting the height of the first measuring cylinder 5 and the second measuring cylinder 13. The knob ring 21 facilitates the threaded connection of the connecting screw 20 and the second connecting rod 22, improving the ease of operation.

[0037] Furthermore, the feed pipe 3 includes a pipe body, the output end of which is provided with a one-way valve 24, and the input end of the pipe body is connected to the output end of the first gear pump 2.

[0038] In this embodiment, the first gear pump 2 is started to pump the medicine in the storage tank into the tube, and then the medicine is pumped into the second measuring cylinder 13 through the one-way valve 24. The one-way valve 24 can effectively prevent the medicine from flowing back or the excess medicine in the tube from flowing into the second measuring cylinder 13 after the first gear pump 2 stops pumping.

[0039] Furthermore, the tube body includes an outer tube 25, and the inner wall of the outer tube 25 is provided with a microporous ceramic inner tube 26. The inner wall of the microporous ceramic inner tube 26 is provided with multiple sets of buffer protrusions 27, and the inner wall of the microporous ceramic inner tube 26 is also provided with multiple sets of porous protective plates 28. Each set of porous protective plates 28 is respectively provided at the bend of the microporous ceramic inner tube 26.

[0040] In this embodiment, the microporous ceramic inner tube 26 is in direct contact with the pharmaceutical agent. The chemical inertness of the microporous ceramic inner tube 26 effectively resists the corrosion of acids and alkalis, preventing the outer tube 25 from rupturing upon contact. The buffer bumps 27 disperse the direct impact of the pharmaceutical agent on the microporous ceramic inner tube 26 and the outer tube 25, reducing localized wear. Furthermore, the multiple sets of buffer bumps 27 reduce the flow rate of the pharmaceutical agent, thereby reducing the impact force at bends and effectively preventing damage to the microporous ceramic inner tube 26. The internal water hammer effect occurs, and the buffer bump 27 can break the laminar flow state of the regenerant in the pipe, avoid the formation of a concentration difference of corrosive medium on the pipe wall surface, and prevent local corrosion. The porous protective plate 28 enhances the structural strength of the bend of the microporous ceramic inner tube 26, prevents the ceramic material from brittle fracture due to turbulent impact or stress concentration, and avoids leakage of corrosive regenerant. The porous structure design can disperse turbulent energy through pores, reduce the direct scouring of the agent, and prevent corrosion damage at the bend of the microporous ceramic inner tube 26 and the outer tube 25.

[0041] Furthermore, the measuring cylinder includes a cylinder body 29, the lower end of the cylinder body 29 is provided with multiple sets of second support legs 30, and the upper end of the cylinder body 29 is hinged to a cylinder cover 31, which covers the cylinder body 29.

[0042] In this embodiment, the cylinder 29 is supported and fixed by multiple sets of second support legs 30, while the cylinder cover 31 covers the cylinder 29. The cylinder cover 31 is installed at the upper end of the cylinder cover 31 by a hinge, which facilitates the opening and closing of the cylinder cover 31. At the same time, the cylinder 29 also supports the tube body to ensure the stability of the tube body output end.

[0043] Furthermore, the storage tank includes a tank body 32, the lower end of the tank body 32 is provided with multiple sets of third support legs 33, the upper end of the tank body 32 is provided with a tank cover 34, and the upper end of the tank body 32 is provided with two sets of second radar level gauges 35.

[0044] In this embodiment, the tank 32 is used to store the medicine, and is supported by multiple sets of third support legs 33. The tank lid 34 covers the tank 32. Among the two sets of second radar level gauges 35, one set of second radar level gauges 35 is used to monitor the highest medicine level in the tank 32 to prevent excessive medicine from overflowing. The other set of second radar level gauges 35 is used to monitor the medicine level in the tank 32 in real time. The reduced medicine volume is calculated based on the reduced medicine volume in the tank 32. The reduced medicine volume in the tank 32, the medicine volume in the second measuring component, and the medicine volume in the first measuring component are compared to finally determine the accuracy of the medicine addition amount.

[0045] Open the can lid 34, inject 5% hydrochloric acid regenerant into the can body 32 up to the 800L mark, close the can lid 34, and ensure that the can body 32 is sealed; Parameters are set via PLC touchscreen: target added mass 80kg, regenerant density 1.023g / cm³. 3 The allowable error is ±0.5%, and the automatic start interval is 40 minutes. The upper part of the first measuring cylinder 5 is a cylindrical structure (inner diameter 450mm, height 800mm) and the lower part is a frustum structure (upper bottom inner diameter 450mm, lower bottom inner diameter 50mm, height 200mm). The inner diameter of the first discharge pipe 7 is 50mm and the length is 100mm. The inner diameter of the tank 32 is 900mm. The PLC issues a start command, the first gear pump 2 starts, the hydrochloric acid regenerant in the storage tank is pumped through the feed pipe 3, and the one-way valve 24 prevents the regenerant from flowing back; Hydrochloric acid regenerator flows into the second measuring cylinder 13 through the output end of the feed pipe 3. The rubber pads 17 at the lower ends of the multiple sets of metering feet 16 transmit the weight to the weight sensor 11. The PLC collects and sums the data from the multiple sets of weight sensors 11 in real time. When the cumulative mass reaches 79.8kg (PLC presets to reduce speed by 0.2kg in advance), the first gear pump 2 reduces its speed. When the mass reaches 80.0kg, the first gear pump 2 stops running, and the one-way valve 24 closes to prevent residual hydrochloric acid regenerator from flowing in. After the PLC confirms that the first gear pump 2 has stopped, it delays for 3 seconds (to ensure that the hydrochloric acid regenerator has completely fallen into the second measuring cylinder 13) and sends an opening command to the electromagnetic butterfly valve 14. When the sum of the weight sensors 11 returns to zero, it feeds back to the PLC to confirm the transfer of the hydrochloric acid regenerator from the second measuring cylinder 13 to the first measuring cylinder 5. The hydrochloric acid regenerant level in the first measuring cylinder 5 was measured to be 715 mm using the first radar level gauge 9 (calculated from the lowest point of the first discharge pipe 7). 715-100-200=415mm, and 415mm is the height of the upper cylindrical structure of the first measuring cylinder 5; Therefore, the volume of hydrochloric acid regenerator in the first measuring cylinder 5 is calculated as follows: The volume of the first discharge pipe 7 is approximately 196.35 cm³. 3 The volume of the lower frustum structure is approximately 11890.63 cm³. 3 A cylindrical structure with a height of 415mm has a volume of approximately 66003.05cm³. 3 The total volume is approximately 78090.03 cm³. 3 ; The required amount of hydrochloric acid regenerant is 80 kg, and the volume to be added should be approximately 80000 / 1.023 ≈ 78191.6 cm³. 3 ; (78191.6-78090.3) / 78191.6×100%≈0.13%<0.5%; The dosage is below the error threshold and meets the requirements for added dosage. When the tank 32 contains 800L of hydrochloric acid regenerant, the initial liquid level is approximately 1257.5mm, and the liquid level after pumping 80kg of hydrochloric acid regenerant is approximately 1135.0mm. The calculated liquid level difference is 1257.5 - 1135.0 = 122.5 mm; Calculate the height of 80kg hydrochloric acid regenerant in tank 32: 78191.6 / (3.1416×45×45)=78191.6 / 6361.74≈12.29cm=122.9mm; (122.9-122.5) / 122.9×100%≈0.32%<0.5%; The dosage is below the error threshold and meets the requirements for added dosage.

[0046] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A fully automatic PLC dosing device, characterized in that, The device includes a frame, inside which are a storage tank and a metering unit. The lower end of the storage tank is equipped with a first gear pump. The input end of the first gear pump is connected to the storage tank, and the output end of the first gear pump is connected to a feed pipe. The other end of the feed pipe is located inside the metering unit. The metering unit includes a first measuring component, a second measuring component at the upper end of the first measuring component, a metering cylinder on the outer wall of the first measuring component and the second measuring component, and a second gear pump at the lower end of the first measuring component.

2. The fully automatic PLC dosing device as described in claim 1, characterized in that, The first measuring component includes a first measuring cylinder, the lower end of which is provided with multiple sets of first support legs, the lower end of which is provided with a first discharge pipe, the upper end of which is provided with a measuring cover, the upper end of which is provided with two sets of first radar level gauges, and the upper end of which is provided with multiple sets of second measuring modules.

3. The fully automatic PLC dosing device as described in claim 1, characterized in that, Each group of the second measurement modules includes a guide cylinder, inside which a weight sensor is installed, and on the inner side of the guide cylinder is a linear bearing.

4. The fully automatic PLC dosing device as described in claim 1, characterized in that, The second measuring component includes a second measuring cylinder, the lower end of which is provided with an electromagnetic butterfly valve, the lower end of which is provided with a second discharge pipe, and the lower end of the second measuring cylinder is provided with multiple sets of metering feet, each set of metering feet being provided with a rubber pad at its lower end.

5. The fully automatic PLC dosing device as described in claim 1, characterized in that, The metering unit also includes multiple sets of connecting components, which are respectively disposed on the outer walls of the first measuring component and the second measuring component.

6. The fully automatic PLC dosing device as described in claim 5, characterized in that, Each of the connecting components includes a first connecting lug, a first connecting rod on the inner side of the first connecting lug, a connecting screw at one end of the first connecting rod, a knob ring on the outer wall of the connecting screw, a second connecting rod at the end of the connecting screw away from the first connecting rod, and a second connecting lug on the outer wall of the second connecting rod.

7. The fully automatic PLC dosing device as described in claim 1, characterized in that, The feed pipe includes a pipe body, the output end of which is equipped with a one-way valve, and the input end of the pipe body is connected to the output end of the first gear pump.

8. The fully automatic PLC dosing device as described in claim 7, characterized in that, The tube body includes an outer tube, and a microporous ceramic inner tube is provided inside the outer tube. The inner wall of the microporous ceramic inner tube is provided with multiple sets of buffer protrusions, and the inner wall of the microporous ceramic inner tube is also provided with multiple sets of porous protective plates. Each set of porous protective plates is respectively set at the bend of the microporous ceramic inner tube.

9. The fully automatic PLC dosing device as described in claim 1, characterized in that, The measuring cylinder includes a cylinder body, the lower end of which is provided with multiple sets of second support legs, and the upper end of the cylinder body is hinged to a cylinder cover, which covers the cylinder body.

10. The fully automatic PLC dosing device as described in claim 1, characterized in that, The storage tank includes a tank body, the lower end of which is provided with multiple sets of third support legs, the upper end of which is provided with a tank cover, and the upper end of which is provided with two sets of second radar level gauges.

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