Abrasive material control method and device of surface cleaning system

Abstract

The invention relates to the technical field of metal surface cleaning, in particular to an abrasive adding control method and device. According to the specific scheme, the slurry control box is arranged, the water valve and the sand valve are arranged below the slurry control box, and then the PLC control device monitors and controls the operation speed and the machining quality of a workpiece, so that the flow of the sand valve and the flow of the water valve are controlled, the water-sand proportion concentration and the flow are precisely controlled, and precise control over the cleaning quality is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface cleaning, in particular to an abrasive adding control method and device therein. Background Art

[0002] In the field of metal surface cleaning technology, solid particles, water and additives are mixed and used to be centrifugally projected onto the surface of steel plates or workpieces through a motor to achieve the purpose of descaling. Since industrial water, solid particles, additives and other substances are used in the metal surface cleaning process, and they are all consumables, these substances need to be automatically detected and added to ensure the performance of the equipment.

[0003] In the steel plate surface cleaning system, the abrasive-water ratio control scheme is a key link, which directly affects the surface cleaning effect and the operation stability of the system. First of all, it is necessary to ensure that the mixing ratio of abrasive and water can achieve the expected descaling effect. This usually needs to be determined experimentally according to the material, thickness, characteristics of the oxide layer of the steel plate and the specific requirements of the production line. Under the premise of ensuring the surface cleaning effect, the consumption of abrasive and water should be minimized to reduce production costs. The ratio of abrasive to water should be kept relatively stable to avoid unstable surface cleaning effect or system failure caused by ratio fluctuations. Before the production line is officially put into operation, a series of experiments should be carried out to determine the optimal ratio of abrasive to water under different steel plate materials and thicknesses. During the experiment, the amount of abrasive and water added can be gradually adjusted to observe and record the descaling effect, system energy consumption, and abrasive and water consumption. Through comparative analysis, the abrasive-water ratio that can achieve good surface cleaning effect and reduce costs is selected.

[0004] A Chinese patent for a sandblasting accessory and a high-pressure slurry abrasive jet injection system (patent application number 201210406262.9) discloses such a system: a sandblasting accessory for a high-pressure slurry abrasive jet injection system, comprising a sandblasting accessory body, a high-pressure cylindrical water nozzle, and a slurry abrasive short tube. A cavity is arranged in the sandblasting accessory body, and the cavity comprises a first cavity and a second cavity. The first cavity is a truncated cone-shaped cavity, and the second cavity is a cylindrical cavity; the bottom surface of the truncated cone-shaped cavity is connected to one end of the cylindrical cavity; the high-pressure cylindrical water nozzle is fixed on the sandblasting accessory body at the other end of the cylindrical cavity, and is connected to the cavity; the slurry abrasive short tube is arranged on the upper part of the sandblasting accessory body, and the slurry abrasive ejected by the slurry abrasive short tube and the high-pressure water ejected by the high-pressure cylindrical water nozzle converge at one end of the cylindrical cavity. This scheme is to mix slurry and water at the nozzle, but how to control the slurry cannot be achieved.

[0005] The Chinese patent for solid particle addition control method, device and system (patent application number 202410598881.5) discloses such a scheme: monitor the liquid level height of the cavity where the solid particles are located, and the weight data of the cavity under the liquid level height, and obtain monitoring data including the liquid level height and weight data; determine the weight deviation corresponding to the weight data based on the monitoring data and the preset liquid level and weight relationship; determine the solid particle addition parameters according to the weight deviation; start the solid particle addition equipment, and control the solid particle addition equipment to add solid particles to the cavity based on the solid particle addition parameters. In this scheme, the solid particle addition parameters are determined by detecting the liquid level and weight. In the actual operation of the system, due to the complex working environment, such as machine vibration, it is actually difficult to accurately detect the weight parameters, and this scheme is actually intermittent detection, and product quality cannot be guaranteed. Summary of the invention

[0006] The invention of this application aims to improve the workpiece quality when cleaning the metal surface by accurately controlling the ratio of water and abrasive.

[0007] In order to achieve the above-mentioned purpose, the scheme of the present application is: an abrasive control method for a surface cleaning system, in which the control system is initialized, and before production begins, the workpiece parameters, the workpiece running speed, the workpiece processing target parameters, and the initial abrasive and water ratio of the slurry control box are set; the flow rates of the water valve and the sand valve are set, and the flow rates are set according to the preset abrasive and water ratio; the workpiece running speed is detected, and the control system adjusts the flow rates of the water valve and the sand valve according to the detection results to adapt to the new workpiece speed; the quality of the processed parts after surface cleaning is detected, and the control system adjusts the flow rates of the water valve and the sand valve accordingly according to the comparison between the surface quality parameters of the finished parts and the target quality parameters.

[0008] Furthermore, the processing target parameters are obtained based on pre-experimental data.

[0009] An abrasive control device for a surface cleaning system comprises a metal surface cleaning box, in which a plurality of jet generators are arranged; a collecting box, which is connected to the bottom of the metal surface cleaning box; a water-sand mixing device, which is connected to the collecting box; a slurry control box, in which the upper part of the slurry control box is connected to the water-sand mixing device; a water valve, which is arranged at the bottom of the slurry control box and is connected, and the other end of the water valve is connected to the jet emitter; a sand valve, which is arranged at the bottom of the slurry control box and is connected, and the other end of the sand valve is connected to the jet emitter; a PLC control device, in which a first detection control loop of the PLC control device is connected to a workpiece sensor for monitoring the workpiece running speed and the workpiece processing quality; a second detection control loop of the PLC control device is connected to a control end of the water valve; and a third detection control loop of the PLC control device is connected to a control end of the sand valve.

[0010] Furthermore, an overflow port is provided on the upper side of the slurry control box.

[0011] Furthermore, the sand valves and water valves are provided in plurality, and the corresponding PLC control loops are also provided in plurality.

[0012] The beneficial effect of the present application is: by setting up a slurry control box, and setting up a water valve and a sand valve under the slurry control box, and then monitoring and controlling the workpiece running speed and processing quality through a PLC control device, thereby controlling the flow rate of the sand valve and the water valve, thereby accurately controlling the water-sand ratio concentration and the flow rate, and achieving precise control of the cleaning quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the workflow diagram of this application; Figure 2 System block diagram of this application. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0016] Metal surface cleaning systems generally use abrasive slurry jets, which are pre-mixed with abrasives, various additives and water into a slurry, which is pressurized by a high-pressure pump and sprayed through a nozzle with highly concentrated energy and very fast speed. This jet can achieve surface cleaning when applied to an object.

[0017] During the operation of the metal surface cleaning system, the mixing ratio of abrasive and water and the cleaning effect should be monitored in real time. At the same time, if the cleaning effect is found to be reduced or the system energy consumption is increased, the ratio of abrasive and water should be checked in time to see if it has changed, and corresponding adjustments should be made. In order to achieve the above purpose, an automatic control system is introduced to monitor the flow of abrasive and water in real time through sensors, and automatically adjust according to the preset ratio parameters. The automatic control system can greatly improve the accuracy and stability of the ratio control and reduce the errors caused by human operation.

[0018] The mixing ratio of abrasive slurry needs to be determined according to the properties of the workpiece. Different workpieces, such as different metals and different metal structures, have different mixing ratios of abrasive slurry. In addition, the target parameters of the workpiece must also be considered, such as the cleanliness and roughness that the workpiece needs to achieve, which is also the standard for determining the mixing ratio of abrasive slurry. Based on the above goals, it is necessary to conduct repeated experiments before production to determine the mixing ratio of abrasive slurry, that is, the ratio of solid particles to water.

[0019] Generally, the particles and water in the descaling system need to be recycled, and some broken particles and oxide layer fragments can be removed during the recycling. Before the inlet of the jet generator, a slurry control box is set to control the mixing ratio of abrasive and water. Two flow valves are set at the outlet of the slurry control box to control the flow of abrasive and water in the slurry control box respectively, so as to control the mixing ratio of abrasive and water.

[0020] The control system collects corresponding data through PLC, and adjusts the flow rate of water and abrasive by comparing it with the preset mixing ratio of abrasive and water, thereby controlling the mixing ratio of abrasive and water to reach the preset parameters.

[0021] The present application is described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 Shown is a flow chart of the method for controlling abrasive and water concentrations of the present application.

[0023] Step S101, control system initialization, before production, workpiece parameters, such as steel plate or copper plate and workpiece structure, workpiece running speed, workpiece processing target parameters, preset abrasive and water ratio parameters according to original experimental data, according to the ratio parameters, increase the initial abrasive and water ratio for the slurry control box.

[0024] Step S102, controlling the flow rate of the water valve and the sand valve, where the valves are all flow valves that can be adjusted by the control system, and the flow rate is controlled by a preset ratio of abrasive to water.

[0025] Step S103, detect the workpiece running speed. Generally, the workpiece running speed is a predetermined uniform speed. During the working process, when the speed changes due to slurry injection and flushing, the control system needs to adjust the flow rate of the water valve and the sand valve in time after detecting it to adapt to the new workpiece speed.

[0026] Step S104, detect the surface of the finished product after surface cleaning, compare the obtained surface quality parameters of the workpiece with the target quality parameters, and the control system adjusts the flow rate of the water valve and the sand valve accordingly. In actual work, it is difficult to make the concentration of abrasive and water consistent with the preset, and the abrasive will also be broken and lost during recycling, that is, the size of the abrasive particles only needs to meet a certain particle size range, and the change of the abrasive will have a greater impact on the processing quality of the workpiece. After the control system detects it, it must adjust the flow rate of the water valve and the sand valve to ensure the processing quality.

[0027] According to the above steps, the fully automated control of the abrasive and water ratio is basically achieved, and the processing quality of the workpiece can be guaranteed. It is more timely and efficient than manual operation control, and the processing quality is guaranteed.

[0028] like Figure 2 As shown, the system diagram of the present application is explained.

[0029] Here, a general introduction to the metal surface cleaning system is required, but the actual metal surface cleaning system is not limited to this structure, and other metal surface cleaning systems may also utilize the present application. The introduction here is only for a clearer understanding of the ratio control of abrasive and water in the present application.

[0030] The metal surface cleaning box 10 is provided with 4 jet generators 11, and the slurry supply is provided by the slurry control box 20. When the workpiece 12 moves from right to left, the jet generator 11 flushes the upper and lower surfaces of the workpiece. The flushed slurry flows into the collection box 13 from the bottom of the cleaning box. The solid particles at the bottom of the collection box enter the venturi 14, and at the same time, the recycled water also enters the venturi, and is mixed in the venturi and then pumped to the slurry control box 20.

[0031] The PLC controller 30 is provided with three control detection loops. The first loop is for detecting the workpiece, mainly detecting the running speed and processing quality of the workpiece, and adjusting the flow of the control water valve and sand valve of the slurry control box 20 according to the workpiece speed and processing quality. The second loop is for monitoring and adjusting the water valve of the slurry control box 20, and the third loop is for monitoring and adjusting the sand valve of the slurry control box 20. In the past, manual adjustment was performed, and the sand was added every hour according to the number of particles in the sand box, which was labor-intensive and the processing quality could not be controlled in real time, so it was difficult to meet the high-quality processing requirements. The present application can accurately control the sand-water ratio flow through real-time adjustment to achieve high-quality processing requirements.

Claims

1. A method for controlling abrasives in a surface cleaning system, characterized in that: Initialize the control system before production, set the workpiece parameters, workpiece running speed, workpiece processing target parameters, and set the initial abrasive and water ratio of the slurry control box; Set the flow rate of the water valve and sand valve according to the preset ratio of abrasive to water; Detect the running speed of the workpiece, and the control system adjusts the flow rate of the water valve and the sand valve according to the detection results to adapt to the new workpiece speed; The quality of the workpiece after surface cleaning is detected, and the control system adjusts the flow rate of the water valve and the sand valve based on the comparison between the surface quality parameters of the finished workpiece and the target quality parameters.

2. The abrasive control method and device of a surface cleaning system according to claim 1, characterized in that: The processing target parameters are obtained based on preliminary experimental data.

3. An abrasive control device for a surface cleaning system, characterized in that: A metal surface cleaning box, wherein a plurality of jet generators are arranged in the metal surface cleaning box; A collecting box body, the collecting box body is connected to the bottom of the metal surface cleaning box body; A water-sand mixing device, the water-sand mixing device is connected to the collection box; A slurry control box, the upper portion of which is connected to the water-sand mixing device; A water valve, the water valve is arranged at the bottom of the slurry control box and is connected, and the other end of the water valve is connected to the jet emitter; A sand valve, the sand valve is arranged at the bottom of the slurry control box and is connected, and the other end of the sand valve is connected to the jet emitter; A PLC control device, wherein the first detection control loop of the PLC control device is connected to the workpiece sensor for monitoring the workpiece running speed and the workpiece processing quality; the second detection control loop of the PLC control device is connected to the water valve control end; and the third detection control loop of the PLC control device is connected to the sand valve control end.

4. The abrasive control device of a surface cleaning system according to claim 3, characterized in that: An overflow port is arranged on the upper side of the slurry control box.

5. The abrasive control device of a surface cleaning system according to claim 4, characterized in that: There are several sand valves and water valves, and there are also several corresponding PLC control loops.

Images