High-pressure water jet sandblasting cleaning control system and method based on metal plate length

Abstract

The invention relates to the technical field of sandblasting equipment control, and discloses a high-pressure water jet sandblasting cleaning control system and method based on the length of metal plates. The system comprises a central processing unit, a conveying control module and a high-pressure water supply control module, wherein the conveying control module is provided with a conveying roller with a fixed spacing and adjustable speed, and the high-pressure water supply control module is provided with a high-pressure pump with adjustable water pressure; the central processing unit generates a speed signal according to a length signal, and transmits the speed signal to the conveying control module; generates a high-pressure water supply pressure signal according to the length signal, and transmits the high-pressure water supply pressure signal to the high-pressure water supply control module; the conveying control module controls the rotation speed of the conveying roller based on the speed signal; the high-pressure water supply control module controls the high-pressure water supply pressure of the high-pressure pump based on the high-pressure water supply pressure signal; and solves the problem that a production line of high-pressure water jet sandblasting cleaning metal plates uses a fixed speed and pressure to clean metal plates of different lengths, causing self-damage and high energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of sandblasting equipment control, and in particular to a high-pressure water jet sandblasting control system and method based on the length of a metal plate. Background Art

[0002] High-pressure water jet sandblasting to clean metal plates is a new green and environmentally friendly cleaning technology. It uses high-pressure water as the driving force of the abrasive. The abrasive speed is much higher than dry shot blasting and wet shot blasting technology, which can achieve higher descaling and cleaning efficiency. The abrasive particle size used is smaller than that of shot blasting technology. From the perspective of descaling mechanism, the overlap of the abrasive landing points on the steel plate surface is higher, the coverage area is wider, and the descaling effect is better. Especially in the case of wear-resistant steel, engineering machinery steel and other steel types, these steel plates have high strength, complex oxide scale composition, and strong adhesion, which are difficult to remove by conventional means. After cleaning with high-pressure water jet sandblasting, the surface metal base color is uniform and there is no oxygen residue, which has obvious technical advantages and cost advantages.

[0003] However, in the production application of high-pressure water jet sandblasting to clean metal plates, the production line needs to clean a variety of steel plates of different lengths. When it is necessary to clean metal plates of different lengths, the loading time of the feeding machine is fixed. If the conveying speed of the conveying device remains unchanged, the spacing between metal plates of different lengths will change after loading, especially when the longer plates are replaced by shorter plates after loading, the spacing between adjacent metal plates will increase significantly. On the other hand, in order to clean comprehensively, the cleaning nozzle is usually kept open during the cleaning process to meet the cleaning needs of steel plates of different lengths. However, because the cleaning nozzle is kept open, the gap between the metal plates will cause the sandblasting to hit the equipment itself in vain. When the spacing is too large, long-term vain hitting will easily cause damage to the equipment itself, making the equipment often need repair and maintenance, and greatly shortening the service life of the equipment. In addition, because the cleaning mode is fixed and the water pressure of sandblasting is fixed, energy consumption cannot be effectively reduced during the cleaning process. Summary of the invention

[0004] The present invention provides a high-pressure water jet sandblasting cleaning control system and method based on the length of metal plates, so as to solve the problem that a high-pressure water jet sandblasting cleaning metal plate production line uses a fixed speed and pressure to clean metal plates of different lengths, causing self damage and high energy consumption.

[0005] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0006] In a first aspect, the present invention provides a high-pressure water jet sandblasting cleaning control system based on the length of a metal sheet, comprising a central processing unit, a conveying device and a high-pressure water supply control module, wherein the conveying device is provided with a conveying control module and a plurality of conveying rollers with fixed spacing and independently adjustable rotation speeds, and the high-pressure water supply control module is provided with a high-pressure pump capable of adjusting the water pressure of the high-pressure water supply;

[0007] The central processor receives the length signal of the metal sheet, generates the speed signal of the conveying control module according to the length signal, and transmits the speed signal to the conveying control module; at the same time, generates the high-pressure water supply pressure signal according to the length signal, and transmits the high-pressure water supply pressure signal to the high-pressure water supply control module;

[0008] The conveying control module receives the speed signal and controls the rotation speed of the conveying roller based on the speed signal;

[0009] The high-pressure water supply control module receives the high-pressure water supply pressure signal and controls the high-pressure water supply pressure of the high-pressure pump based on the high-pressure water supply pressure signal;

[0010] The generation of the high-pressure water supply pressure signal according to the length signal is expressed by the following formula:

[0011] ,when Less than hour, ;

[0012] in, Indicates the pressure value corresponding to the high-pressure water supply pressure signal, in units of ; Indicates the minimum pressure value allowed for cleaning metal sheets, in units of ; Represents an empirical constant, with a value range of 8-12; Indicates the length of the metal sheet corresponding to the length signal, in units of ; express The corresponding maximum length of the cleaned metal sheet is in .

[0013] Furthermore, each conveying roller is provided with a control station and is numbered sequentially from the metal sheet loading point to the metal sheet unloading point of the conveying device. The central processing unit obtains the position signal of the front end of the metal sheet in the moving direction, and transmits the position signal and the length signal to the conveying control module. After receiving the position signal and the length signal, the conveying control module controls the conveying rollers below the metal sheet and adjacent to the front of the movement to work, and the remaining conveying rollers in the conveying device without metal sheets above do not work.

[0014] Furthermore, the obtaining of the position signal of the front end of the metal sheet in the moving direction specifically includes: obtaining the position signal by real-time calculation by collecting the rotation speed of the conveying roller in the working state, the period of the collecting time and the starting position of the metal sheet;

[0015] The position signal is calculated by the following formula:

[0016] ;

[0017] in, Indicates the position signal obtained this time, indicating the distance between the metal sheet and the loading point; Indicates the starting position of the metal sheet or the position indicated by the last acquired position signal; Indicates the rotation speed of the conveyor roller collected this time; Indicates the period of acquisition time;

[0018] When the position signal is obtained next time, the position indicated by the position signal obtained this time is replaced with the starting position.

[0019] Furthermore, the rotation speed of the collecting conveyor roller refers to the rotation speed of the conveyor roller collecting the middle part below the metal sheet;

[0020] The central processor obtains the position of the middle conveying roller below the metal sheet according to the length signal, the most recently obtained position signal, and the fixed spacing and number of the conveying rollers;

[0021] The middle conveying roller below the metal sheet is calculated by the following formula:

[0022] ;

[0023] in, Indicates the number of the middle conveyor roller under the metal sheet. Indicates rounding up. Indicates the fixed spacing of the conveyor rollers.

[0024] Furthermore, the speed signal of the conveying control module generated according to the length signal is expressed by the following formula:

[0025] ;

[0026] in, Indicates the cleaning speed corresponding to the speed signal, in units of , Indicates the preset safety distance between every two metal plates. Indicates the interval time between loading each metal sheet.

[0027] Furthermore, the conveying device is provided with a photoelectric detection unit for detecting the position of the metal sheet at predetermined intervals.

[0028] Furthermore, the central processor receives a photoelectric signal generated by the photoelectric detection unit when detecting the passage of the metal sheet, and corrects the position signal based on the photoelectric signal;

[0029] When the position represented by the photoelectric signal is greater than or less than the position represented by the position signal, the position information represented by the photoelectric signal replaces the position information represented by the current position signal.

[0030] Further, the central processing unit includes a transport fault alarm module;

[0031] If the conveying fault alarm module does not receive a photoelectric signal within a first predetermined time after loading, or the time between two consecutive photoelectric signals is greater than the first predetermined time, the central processor issues an alarm;

[0032] When the time between two consecutive photoelectric signals received by the conveying fault alarm module is greater than a second predetermined time, the central processing unit controls the conveying device to stop conveying the metal sheet;

[0033] The second predetermined time is greater than the first predetermined time.

[0034] Furthermore, it also includes a sand valve control module and a cleaning station, wherein the cleaning station includes a plurality of cleaning boxes, wherein cleaning nozzles with fixed spacing are arranged in the cleaning boxes, and each cleaning box is responsible for cleaning different width intervals along the width direction of the conveying device, and each cleaning box is provided with a cleaning nozzle along the width direction of the conveying device and covers the width interval that the cleaning box is responsible for cleaning;

[0035] The central processor receives a width signal of the metal sheet, determines the opening number of the sand supply valve according to the width signal, and sends a sand valve control signal to the sand valve control module based on the opening number of the sand supply valve. The sand valve control module receives the sand valve control signal from the central processor and adjusts the opening number of the sand supply valve according to the sand valve control signal.

[0036] Each of the sand supply valves is connected to at least one cleaning nozzle, and each of the sand supply valves is sequentially connected to a corresponding number of cleaning nozzles along the width direction of the conveyor belt;

[0037] The opening quantity of the sand supply valve is calculated by the following formula:

[0038] ;

[0039] in Indicates the number of openings of the sand supply valve; Indicates the width of the metal sheet; Indicates the fixed spacing of the cleaning nozzles on the production line. Indicates the number of cleaning nozzles connected to a single sand supply valve.

[0040] In a second aspect, the present invention provides a high-pressure water jet sandblasting cleaning control method based on the length of a metal sheet, which is applied to the high-pressure water jet sandblasting cleaning control system based on the length of a metal sheet described above, and the control method comprises the following steps:

[0041] Step 1: The central processing unit receives the length signal and width signal of the metal sheet, determines the speed signal of the conveying control module according to the length signal, generates a high-pressure water supply pressure signal according to the length signal, determines the opening number of the sand supply valve according to the width signal, and the central processing unit turns on the high-pressure water supply control module, the conveying control module and the sand valve control module in sequence, and transmits the speed signal to the conveying control module, transmits the high-pressure water supply pressure signal to the high-pressure water supply control module, sends a sand valve control signal to the sand valve control module according to the opening number of the sand supply valve, and the conveying control module controls the rotation speed of the conveying roller based on the speed signal to start transporting the metal sheet;

[0042] Step 2: Start conveying the metal sheet from the feeding place, start the conveying roller at the feeding place, the central processing unit calculates the number of the middle conveying roller below the metal sheet according to the position of the metal sheet from the feeding place, the fixed spacing of the conveying rollers, and the length of the metal sheet, and collects the real-time rotation speed of the conveying roller with the number, and calculates and updates the position of the metal sheet in combination with the position of the metal sheet from the feeding place after a collection time period. At the same time, the central processing unit controls the conveying rollers below the metal sheet and the adjacent conveying rollers in front of the movement in the conveying device according to the position signal and length signal of the metal sheet, and the remaining conveying rollers without metal sheets above do not work. During the conveying process, the position of the passing metal sheet is corrected by the photoelectric detection unit, the sand valve control module adjusts the opening number of the sand valve according to the sand valve control signal, and the high-pressure water supply control module controls the high-pressure water supply water pressure of the high-pressure pump according to the high-pressure water supply water pressure signal, and starts to clean the metal sheet;

[0043] Step 3: Stop transporting the metal sheet, and the central processing unit closes the sand valve control module, the conveying control module and the high-pressure water supply control module in sequence to complete the cleaning of the metal sheet.

[0044] Beneficial effects:

[0045] The high-pressure water jet sandblasting cleaning control system and method based on the length of the metal plate provided by the present invention automatically configures the rotation speed of the conveying roller in the conveying control module by collecting the length signal of the metal plate, and configures the water supply pressure of the high-pressure pump based on the length signal. Compared with the dry shot blasting and wet shot blasting technologies that can only adopt one production mode for production, the energy saving and consumption reduction of the production line are achieved. Under the condition of a fixed feeding speed, the gap between metal plates of different lengths on the production line is controllable, avoiding the situation of excessive gap due to the short length of the metal plate and the fixed feeding time, and then the occurrence of empty hitting of the equipment. In addition, when cleaning a metal plate with a shorter length, the cleaning speed is reduced, and the water supply pressure of the high-pressure pump will also be adjusted down accordingly. It has significant advantages in terms of production line equipment protection and energy saving and consumption reduction.

[0046] The present invention controls whether the conveyor roller rotates and the rotation speed by acquiring the position of the metal sheet, thereby further achieving energy saving and consumption reduction, and corrects the position of the metal sheet through photoelectric detection, avoiding the cumulative error in the calculation of the metal sheet position and the idling of the conveyor roller.

[0047] The present invention also automatically configures the number of open sand supply valves by collecting width signals of metal plates, and further determines the number of open high-pressure pumps, sand extractors, sand pumps, and sand extraction valves based on the number of open sand supply valves. Compared with dry shot blasting and wet shot blasting technologies that can only adopt one production mode for production, energy saving and consumption reduction of the production line are achieved. Moreover, based on the corresponding relationship between the sand supply valve and the cleaning nozzle, after determining the number of open sand supply valves, the number of open cleaning nozzles and the cleaning width direction are also determined, thereby avoiding empty hitting of the equipment. This has significant advantages in production line equipment protection and energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the module structure of a high-pressure water jet sandblasting cleaning control system based on the length of a metal plate according to an embodiment of the present invention;

[0049] Figure 2 It is a schematic diagram of the conveying control module controlling the working of the conveying rollers below the metal sheet and in front of the metal sheet in an embodiment of the present invention;

[0050] Figure 3 It is a schematic diagram of obtaining a position signal of a metal sheet on a conveying roller in an embodiment of the present invention.

[0051] In the figure:

[0052] 1. Conveyor roller; 2. Metal sheet. DETAILED DESCRIPTION

[0053] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0055] See also Figure 1 , the embodiment of the present application provides a high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet, including a central processing unit, a conveying device and a high-pressure water supply control module, the conveying device is provided with a conveying control module and a plurality of conveying rollers 1 with fixed spacing and adjustable rotation speed, and the high-pressure water supply control module is provided with a high-pressure pump capable of adjusting the water pressure of the high-pressure water supply;

[0056] The central processing unit receives the length signal of the metal sheet 2, generates a speed signal of the conveying control module according to the length signal, and transmits the speed signal to the conveying control module;

[0057] At the same time, a high-pressure water supply pressure signal is generated according to the length signal, and the high-pressure water supply pressure signal is transmitted to the high-pressure water supply control module;

[0058] The high-pressure water supply pressure signal generated according to the length signal is expressed by the following formula:

[0059] ,when Less than hour, ;

[0060] in, Indicates the pressure value corresponding to the high-pressure water supply pressure signal, in units of ;

[0061] Indicates the minimum pressure value allowed for cleaning metal sheet 2, in units of ;

[0062] represents the empirical constant; Indicates the length of the metal sheet 2 corresponding to the length signal, in units of ;

[0063] express The corresponding maximum length of the cleaned metal sheet 2 is in ;

[0064] The speed signal generated by the conveying control module according to the length signal is expressed by the following formula:

[0065] ;

[0066] in, Indicates the cleaning speed corresponding to the speed signal, in units of , Indicates the preset safety distance between every two metal plates 2, Indicates the interval time for loading each metal sheet 2.

[0067] The conveying control module receives the speed signal and controls the rotation speed of the conveying roller 1 based on the speed signal;

[0068] The high-pressure water supply control module receives a high-pressure water supply pressure signal and controls the high-pressure water supply pressure of the high-pressure pump based on the high-pressure water supply pressure signal;

[0069] Based on the above, the gap between the metal plates 2 of different lengths can be regulated while ensuring that they are clean. At the same time, the cleaning speed and the high-pressure water supply pressure can be regulated, thereby achieving energy saving and consumption reduction of the production line. It also avoids the situation where the gap is too large due to the metal plate 2 being too short and the feeding time being fixed, which leads to empty hitting of the equipment. When cleaning the metal plate 2 with a shorter length, the cleaning speed is reduced, and the water supply pressure of the high-pressure pump will also be lowered accordingly. It has significant advantages in production line equipment protection and energy saving and consumption reduction.

[0070] Please refer to Table 1, the feeding lengths are , as well as The corresponding cleaning speed of the delivery control module and the corresponding pressure of the high-pressure pump are shown in Table 1.

[0071] Table 1: Length of metal sheet 2 , as well as Cleaning speed and high pressure pump pressure comparison table

[0072]

[0073] In this embodiment, the safety distance set between the two metal plates is , the time interval between the feeding of two metal sheets 2 is , then according to the formula for generating speed signal from length signal, it can be known that when the metal sheet 2 is , as well as When , the corresponding speed signals (cleaning speed in Table 1) are , , , Set to , Set to , Set to 10. According to the formula for generating high-pressure water supply pressure signal based on the length signal, it can be seen that when the metal plate 2 is , as well as When the corresponding high pressure pump pressure is , as well as .

[0074] In this embodiment, there are 200 conveyor rollers 1, which are numbered from 1 to 200 in sequence starting from the feeding position of the conveyor device. The fixed spacing between the conveyor rollers 1 is , the conveyor roller 1 is set to the two conveyor rollers below the metal sheet 2 and at the front end of the metal sheet 2. Both conveyor rollers need to work. , as well as When the metal sheet 2 is placed at the loading position by the loading machine, the corresponding conveying rollers 1 are numbered 1 to 31, 1 to 12 and 1 to 9 respectively.

[0075] Among them, see Figure 2 The central processing unit also obtains the position signal of the front end of the metal sheet 2 in the direction of movement, and transmits the position signal and the length signal to the conveying control module. After receiving the position signal and the length signal, the conveying control module controls the conveying rollers 1 below the metal sheet 2 and adjacent to the front of the movement to work, and the remaining conveying rollers 1 in the conveying control module without the metal sheet 2 above do not work, thereby improving the effect of energy saving and consumption reduction.

[0076] Specifically, each conveying roller 1 is provided with a control station and is numbered in sequence from the loading point to the unloading point of the metal sheet 2 of the conveying device. The central processing unit obtains the position signal of the front end of the metal sheet 2 in the moving direction, and transmits the position signal and the length signal to the conveying control module. After receiving the position signal and the length signal, the conveying control module controls the conveying rollers 1 below the metal sheet 2 and adjacent to the front of the moving sheet to work, and the remaining conveying rollers 1 in the conveying device without the metal sheet 2 above do not work;

[0077] The position signal is obtained by collecting the rotation speed of the conveying roller 1 in the working state, the period of the collection time and the starting position of the metal plate 2 in real time. The position signal is calculated by the following formula:

[0078] ;

[0079] in, Indicates the position represented by the position signal obtained this time; Indicates the starting position of the metal sheet 2 or the position indicated by the last acquired position signal; Indicates the rotation speed of the conveyor roller 1 collected this time; Indicates the period of acquisition time.

[0080] When the position signal is obtained next time, the position represented by the position signal obtained this time is replaced with the starting position, that is, the position of the position signal obtained this time is replaced with the starting position. , in the next calculation, it is replaced by .

[0081] See also Figure 3 , then the metal sheet 2 in the figure has passed time Then it moves from position a to point b, then the position represented by point a is , point b is , and the distance of the intermediate movement is determined by the acquisition time period The rotation speed of the conveyor roller 1 Multiply to get.

[0082] The rotation speed of the collecting conveyor roller 1 refers to the rotation speed of the conveyor roller 1 in the middle below the collecting metal sheet 2;

[0083] The central processing unit obtains the position of the middle conveying roller 1 below the metal sheet 2 according to the length signal, the most recently obtained position signal, and the fixed spacing and number of the conveying roller 1;

[0084] The middle conveying roller 1 below the metal sheet 2 is calculated by the following formula:

[0085] ;

[0086] in, Indicates the number of the middle conveyor roller 1 below the metal sheet 2, Indicates rounding up. Indicates the fixed spacing of the conveyor roller 1.

[0087] The conveying device is provided with photoelectric detection units for detecting the position of the metal sheet 2 at predetermined intervals.

[0088] The central processor receives the photoelectric signal generated by the photoelectric detection unit when the metal sheet 2 passes by, and corrects the position signal based on the photoelectric signal;

[0089] When the position indicated by the photoelectric signal is greater than or less than the position indicated by the position signal, the position information indicated by the photoelectric signal replaces the position information indicated by the current position signal;

[0090] The central processing unit includes a conveying fault alarm module;

[0091] If the conveying fault alarm module does not receive a photoelectric signal within the first predetermined time after loading, or the time between two consecutive photoelectric signals is greater than the first predetermined time, the central processor will issue an alarm;

[0092] When the time between two adjacent photoelectric signals received by the conveying fault alarm module is greater than a second predetermined time, the central processing unit controls the conveying device to stop conveying the metal sheet 2, and the second predetermined time is greater than the first predetermined time.

[0093] During the process of the conveying device conveying the metal sheet 2, the conveying roller 1 may slip, so a photoelectric detection unit is set to realize position correction. If the conveying process slips multiple times, the front and rear metal sheets 2 may collide with each other. Therefore, a first predetermined time is set accordingly. After the current metal sheet 2 passes, the rear metal sheet 2 slips. If the central processor does not receive the photoelectric signal within the first predetermined time, it is judged that the rear metal sheet 2 slips and an alarm is issued. When the metal sheet 2 is stuck somewhere during the conveying process, the two photoelectric signals are greater than the second predetermined time, then it is judged that the rear metal sheet 2 is stuck, and the conveying device is controlled to stop conveying the metal sheet 2.

[0094] In this embodiment, the cleaning speed of the conveying control module and the pump operating frequency of the high-pressure pump are determined according to the length signal. In other embodiments, different formulas can be set based on the lengths of common models of metal plates 2. Specifically, the cleaning speed and pump operating frequency are fixed under each formula, and the formula is determined directly based on the length. The central processing unit matches the corresponding formula according to the length and material of the metal plate 2 to be cleaned. The staff can know the length, cleaning speed and pump operating frequency of the metal plate 2 to be cleaned through the formula, and the equipment operation information can be displayed more centrally and effectively.

[0095] It also includes a sand valve control module and a cleaning station. The cleaning station includes a plurality of cleaning boxes. Cleaning nozzles with fixed spacing are arranged in the cleaning boxes. Each cleaning box is responsible for cleaning different width intervals along the width direction of the conveying device. Cleaning nozzles are arranged in each cleaning box along the width direction of the conveying device and cover the width interval that the cleaning box is responsible for cleaning.

[0096] The central processing unit receives the width signal of the metal plate 2, determines the opening number of the sand supply valve according to the width signal, and sends a sand valve control signal to the sand valve control module based on the opening number of the sand supply valve. The sand valve control module receives the sand valve control signal from the central processing unit and adjusts the opening number of the sand supply valve according to the sand valve control signal.

[0097] A single sand supply valve is connected to at least one cleaning nozzle, and each sand supply valve is sequentially connected to a corresponding number of cleaning nozzles along the width direction of the conveyor belt;

[0098] The opening quantity of the sand supply valve is calculated by the following formula:

[0099] ;

[0100] in Indicates the number of openings of the sand supply valve; represents the width of the metal sheet 2; Indicates the fixed spacing of the cleaning nozzles on the production line. Indicates the number of cleaning nozzles connected to a single sand supply valve.

[0101] In this embodiment, an abrasive supply and recovery module is also included, and the abrasive supply and recovery module includes a sand pump, a sand pump and a sand pump valve. Different intervals of the cleaning section in the conveying control module are each provided with a cleaning box, and a cleaning nozzle is provided in the cleaning box. Each cleaning box cleans different areas of the metal plate 2 along the width direction, and the cleaning nozzle and the sand supply valve provided in the sand valve control module are in a one-to-one correspondence in sequence;

[0102] The central processing unit requests and receives the width signal of the metal plate 2, determines the opening number of the sand supply valve according to the width signal, and then determines the opening number of the sand pump according to the opening number of the sand supply valve, and determines the opening number of the sand pump and the sand pumping valve based on the opening number of the sand pump. The central processing unit sends a control signal to the sand valve control module based on the opening number of the sand supply valve, and sends a control signal to the abrasive supply and recovery module based on the opening number of the sand pump, the sand pump and the sand pumping valve.

[0103] In this embodiment, in addition to the central processing unit, the delivery control module, the high-pressure water supply control module, the sand valve control module, and the abrasive supply recovery module, a flushing control module is also provided.

[0104] Specifically, the sand valve control module is composed of a single or multiple sand supply valve control stations. The number of sand supply valve control stations depends on the number of cleaning boxes. Each cleaning box is equipped with a sand supply valve control station. The sand supply valve control station includes an interface unit, an I / O unit, a solenoid valve and a sand supply valve. The I / O unit outputs a control signal to the solenoid valve, and the solenoid valve operates to control the opening and closing of the sand supply valve. Each solenoid valve corresponds to a sand supply valve, and each sand supply valve corresponds to a cleaning nozzle. Each cleaning box in the production line contains multiple cleaning nozzles.

[0105] The conveying control module includes a frequency converter control station for conveying roller 1, a side guide servo motor control station, and a metal sheet 2 position detection. The metal sheet 2 conveying system includes several conveying rollers 1. The conveying rollers 1 can adopt a single-roller single-frequency conversion (single-roller single-motor single-frequency converter) transmission mode, or all conveying rollers 1 can be divided into several groups according to a certain number of rollers per group, and each group uses a frequency converter and a motor, and a sprocket drives multiple conveying rollers 1 in the group. Each conveying roller 1 frequency converter is an independent control station, and the speed control and electrical parameter reading of the conveying roller 1 are completed through the frequency converter control station, thereby realizing the control of the conveying of the metal sheet 2. The production line is equipped with several side guide units and side guide servo motors. Each side guide servo motor is equipped with an independent control station, and the control and parameter reading of each side guide unit are completed through the corresponding servo motor control station. The metal sheet 2 position detection includes an AD module, an I / O module, a photoelectric detection switch, and a proximity switch. A photoelectric detection switch or a proximity switch is installed at a certain distance on the conveyor roller 1 of the production line, and a photoelectric detection switch or a proximity switch is installed at the inlet and outlet of each cleaning box and flushing box.

[0106] The high-pressure water supply control module includes a high-pressure pump inverter control station, high-pressure pump outlet water pressure monitoring, high-pressure pump oil temperature monitoring, and high-pressure pump oil pressure monitoring. The entire production line contains multiple high-pressure pumps, each of which is equipped with a frequency converter. Each high-pressure pump frequency converter is an independent control station. The control and electrical parameter reading of the high-pressure pump are completed through the frequency converter control station, thereby realizing the control of the high-pressure water supply. High-pressure pump outlet water pressure monitoring, high-pressure pump oil temperature monitoring, and high-pressure pump oil pressure monitoring include AD modules and monitoring sensors. Each high-pressure pump is equipped with outlet water pressure, oil temperature, and oil pressure sensors.

[0107] The flushing control module includes a low-pressure flushing pump inverter control station, a low-pressure flushing valve control station, a high-pressure flushing pump inverter control station, and a flushing pump outlet water pressure monitor. Both the low-pressure flushing pump and the high-pressure flushing pump are equipped with inverters, and their control and electrical parameter reading are completed through the corresponding flushing pump inverter control station. The low-pressure flushing pump is used to punch the metal sheet 2 after cleaning in the cleaning box, and the high-pressure flushing pump is used to high-pressure flush the metal sheet 2 after passing through the flushing box;

[0108] The low-pressure flushing valve control station includes an interface unit, an I / O unit, a solenoid valve, and a pneumatic flushing valve. The I / O unit outputs a control signal to the solenoid valve, which controls the opening and closing of the pneumatic flushing valve. Each solenoid valve corresponds to a pneumatic flushing valve, and the flushing pipeline of each cleaning box on the production line is equipped with an independent pneumatic flushing valve. The flushing pump outlet water pressure monitoring includes an AD unit and a water pressure sensor. Two water pressure sensors are set at the outlet of the low-pressure flushing pump, one of which is dedicated to constant pressure control and the other monitors the outlet water pressure. A water pressure sensor is set at the outlet of the high-pressure flushing pump.

[0109] The abrasive supply and recovery module includes a sand pump inverter control station, a water supply pump inverter control station, a sand pump and water supply valve control station, a cyclone separation slurry pump inverter control station, an overflow pump and abrasive screening motor control station, a sand pump outlet water pressure monitoring, a water supply pump outlet water pressure monitoring, an overflow tank level monitoring, and an abrasive weight monitoring. Each sand pump, water supply pump, and cyclone separation slurry pump is equipped with a separate inverter. Each inverter is an independent control station. The control of the corresponding water pump and the reading of electrical parameters are completed through the inverter control station. The production line contains multiple sand pumps and cyclone separation slurry pumps. Usually, two cleaning boxes are equipped with a sand pump, each cleaning box is designed with an overflow box, and each overflow box is equipped with a cyclone separation slurry pump. The sand pumping and water replenishment valve control station includes an interface unit, an I / O unit, a solenoid valve, a pneumatic sand pumping valve, and a pneumatic water replenishment valve. The control signal is output to the solenoid valve through the I / O unit. The solenoid valve operates to control the opening and closing of the pneumatic sand pumping valve and the water replenishment valve. Each solenoid valve corresponds to a pneumatic sand pumping valve or a pneumatic water replenishment valve. There are several sand pumping pipelines and sand pumps designed at the lower end of each cleaning box on the production line. Each sand pumping pipeline is equipped with an independent pneumatic sand pumping valve. Similarly, each cleaning box's water replenishment pipeline is also equipped with an independent pneumatic water replenishment valve. The overflow pump and abrasive screening motor control station includes an interface unit, an I / O unit, an intermediate relay, and a contactor. It is responsible for controlling the operation of the overflow pump and the abrasive screening motor. The overflow box of each cleaning box on the production line is equipped with an overflow pump. Each cleaning box has an abrasive tank at the upper end, and an abrasive screening motor is configured above each abrasive tank.

[0110] The sand pump outlet water pressure monitoring, water supply pump outlet water pressure monitoring, overflow tank liquid level monitoring include AD unit, I / O unit, water pressure sensor, liquid level sensor, float switch, weighing sensor. Two water pressure sensors are set at the outlet of the sand pump and water supply pump, one of which is used for constant pressure control, and the other monitors the outlet water pressure. The overflow tank uses both a liquid level sensor and a float switch to monitor and control its liquid level.

[0111] In this embodiment, a maintenance management module is also provided, and the maintenance management module includes an engineer station, a host computer human-machine interface control station, a remote operation station, and a local operation station. The engineer station is used by professional engineers to perform maintenance management, software and hardware configuration, control program modification, program operation monitoring, and system testing on the control system. The host computer human-machine interface control station is composed of a computer and configuration software, and is set in the central control room for operators to use. It has functions such as control, parameter and function setting, monitoring display, alarm display, and historical data storage. The remote operation station is composed of an operating console, an interface unit, an I / O unit, a button, an indicator light, and an alarm. It is set in the central control room and is used to start and stop the system with one button, handle emergencies, and provide alarm prompts. The local operation station is composed of a field operation box, an interface unit, an I / O unit, a button, an indicator light, and a switch. It is installed next to the production line equipment and is mainly used for jog testing during equipment commissioning and maintenance, and the remote / local switching function of the relevant equipment is set.

[0112] In this embodiment, a field bus control method is adopted, the central processing unit and each control station are connected by optical fiber or network cable, industrial Ethernet is used for communication, a switch station is set, and a star network topology connection method is applied. The control station is installed next to the corresponding equipment of the production line according to the factory conditions, and each control station and the corresponding control execution element or sensor detection element are connected by cable. Through such a networking method, not only the huge control system becomes more concise, but also a lot of cable costs and installation workload can be saved. In addition, the central processing unit also exchanges data with the secondary machine, the tertiary machine and other production line equipment in the factory through the industrial Ethernet method. The overall control method is adopted. The central processing unit and each control module are controlled by block hierarchical control and sequential control, which overcomes the problems of multiple control points and complex control process, and realizes the intelligent operation of production line equipment.

[0113] The embodiment of the present application also provides a high-pressure water jet sandblasting cleaning control method based on the length of the metal plate 2, which is applied to the above-mentioned high-pressure water jet sandblasting cleaning control system based on the length of the metal plate 2. The control method includes the following steps:

[0114] Step 1: The central processing unit receives the length signal and width signal of the metal sheet 2, determines the speed signal of the conveying control module according to the length signal, generates a high-pressure water supply pressure signal according to the length signal, determines the opening number of the sand supply valve according to the width signal, and the central processing unit turns on the high-pressure water supply control module, the conveying control module and the sand valve control module in sequence, and transmits the speed signal to the conveying control module, transmits the high-pressure water supply pressure signal to the high-pressure water supply control module, sends a sand valve control signal to the sand valve control module according to the opening number of the sand supply valve, and the conveying control module controls the rotation speed of the conveying roller 1 based on the speed signal to start transporting the metal sheet 2;

[0115] Step 2: Start conveying the metal sheet 2 from the feeding place, start the conveying roller 1 at the feeding place, the central processing unit calculates the number of the middle conveying roller 1 below the metal sheet 2 according to the position of the metal sheet 2 from the feeding place, the fixed spacing of the conveying roller 1, and the length of the metal sheet 2, and collects the real-time rotation speed of the conveying roller with the number, and updates the position of the metal sheet 2 in combination with the position of the metal sheet 2 from the feeding place after a collection time period. At the same time, the central processing unit controls the conveying rollers 1 below the metal sheet 2 and in front of the movement in the conveying device according to the position signal and length signal of the metal sheet 2 to work, and the remaining conveying rollers 1 without the metal sheet 2 above do not work. During the conveying process, the position of the passing metal sheet 2 is corrected by the photoelectric detection unit, the sand valve control module adjusts the opening number of the sand valve according to the sand valve control signal, and the high-pressure water supply control module controls the high-pressure water supply water pressure of the high-pressure pump according to the high-pressure water supply water pressure signal, and starts to clean the metal sheet 2;

[0116] Step 3: Stop transporting the metal sheet 2 , and the central processing unit closes the sand valve control module, the conveying control module and the high-pressure water supply control module in sequence to complete the cleaning of the metal sheet 2 .

[0117] Based on the above detailed description of the preferred specific embodiments of the present invention, it should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A high-pressure water jet sandblasting cleaning control system based on the length of metal sheets, characterized in that: It comprises a central processing unit, a conveying device and a high-pressure water supply control module, wherein the conveying device is provided with a conveying control module and a plurality of conveying rollers (1) with fixed spacing and independently adjustable rotation speeds, and the high-pressure water supply control module is provided with a high-pressure pump capable of adjusting the water pressure of the high-pressure water supply; The central processing unit receives a length signal of the metal sheet (2), generates a speed signal of the conveying control module according to the length signal, and transmits the speed signal to the conveying control module; and simultaneously generates a high-pressure water supply pressure signal according to the length signal, and transmits the high-pressure water supply pressure signal to the high-pressure water supply control module; The conveying control module receives the speed signal and controls the rotation speed of the conveying roller (1) based on the speed signal; The high-pressure water supply control module receives the high-pressure water supply pressure signal and controls the high-pressure water supply pressure of the high-pressure pump based on the high-pressure water supply pressure signal; The generation of the high-pressure water supply pressure signal according to the length signal is expressed by the following formula: ,when Less than hour, ; in, Indicates the pressure value corresponding to the high-pressure water supply pressure signal, in units of ; Indicates the minimum pressure value allowed for cleaning metal sheets (2), in units of ; Represents an empirical constant, with a value range of 8-12; Indicates the length of the metal sheet (2) corresponding to the length signal, in units of ; express The corresponding maximum length of the cleaned metal sheet (2) is in .

2. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 1, characterized in that: Each of the conveying rollers (1) is provided with a control station and is numbered in sequence from the loading point to the unloading point of the metal sheet (2) of the conveying device. The central processing unit obtains a position signal of the front end of the metal sheet (2) in the moving direction, and transmits the position signal and the length signal to the conveying control module. After receiving the position signal and the length signal, the conveying control module controls the conveying rollers (1) below the metal sheet (2) and adjacent to the front of the moving sheet to work, and the remaining conveying rollers (1) in the conveying device without the metal sheet (2) above do not work.

3. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 2, characterized in that: The method of obtaining the position signal of the front end of the metal sheet (2) in the direction of movement specifically comprises: obtaining the position signal by real-time calculation based on the rotation speed of the conveying roller (1) in the working state and the period of the acquisition time combined with the starting position of the metal sheet (2); The position signal is calculated by the following formula: ； in, The position signal obtained this time indicates the distance between the metal sheet (2) and the loading point; Indicates the starting position of the metal sheet (2) or the position indicated by the last acquired position signal; Indicates the rotation speed of the conveying roller (1) collected this time; Indicates the period of acquisition time; When the position signal is obtained next time, the position indicated by the position signal obtained this time is replaced with the starting position.

4. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 3, characterized in that: The rotation speed of the collecting conveying roller (1) refers to the rotation speed of the conveying roller (1) collecting the middle part below the metal plate (2); The central processor obtains the position of the middle conveying roller (1) below the metal sheet (2) based on the length signal, the most recently acquired position signal, and the fixed spacing and number of the conveying roller (1); The middle conveying roller (1) below the metal plate (2) is calculated by the following formula: ； in, Indicates the number of the middle conveyor roller (1) below the metal sheet (2), Indicates rounding up. Indicates the fixed spacing of the conveyor rollers (1).

5. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 4, characterized in that: The speed signal of the conveying control module generated according to the length signal is expressed by the following formula: ； in, Indicates the cleaning speed corresponding to the speed signal, in units of , Indicates the preset safety distance between every two metal plates (2). Indicates the interval time between loading each metal sheet (2).

6. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 5, characterized in that: The conveying device is provided with a photoelectric detection unit for detecting the position of the metal sheet (2) at predetermined intervals.

7. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 6, characterized in that: The central processor receives a photoelectric signal generated by the photoelectric detection unit when detecting the metal plate (2) passing by, and corrects the position signal based on the photoelectric signal; When the position represented by the photoelectric signal is greater than or less than the position represented by the position signal, the position information represented by the photoelectric signal replaces the position information represented by the current position signal.

8. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 7, characterized in that: The central processing unit includes a conveying fault alarm module; If the conveying fault alarm module does not receive a photoelectric signal within a first predetermined time after loading, or the time between two consecutive photoelectric signals is greater than the first predetermined time, the central processor issues an alarm; When the time between two consecutive photoelectric signals received by the conveying fault alarm module is greater than a second predetermined time, the central processor controls the conveying device to stop conveying the metal sheet (2); The second predetermined time is greater than the first predetermined time.

9. The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet according to claim 8, characterized in that: It also includes a sand valve control module and a cleaning station, wherein the cleaning station includes a plurality of cleaning boxes, wherein cleaning nozzles with fixed spacing are arranged in the cleaning boxes, and each cleaning box is responsible for cleaning different width intervals along the width direction of the conveying device, and each cleaning box is provided with a cleaning nozzle along the width direction of the conveying device and covers the width interval that the cleaning box is responsible for cleaning; The central processor receives a width signal of the metal plate (2), determines the opening number of the sand supply valve according to the width signal, the central processor sends a sand valve control signal to the sand valve control module based on the opening number of the sand supply valve, the sand valve control module receives the sand valve control signal from the central processor, and adjusts the opening number of the sand supply valve according to the sand valve control signal; Each of the sand supply valves is connected to at least one cleaning nozzle, and each of the sand supply valves is sequentially connected to a corresponding number of cleaning nozzles along the width direction of the conveyor belt; The opening quantity of the sand supply valve is calculated by the following formula: ； in Indicates the number of openings of the sand supply valve; represents the width of the metal sheet (2); Indicates the fixed spacing of the cleaning nozzles on the production line. Indicates the number of cleaning nozzles connected to a single sand supply valve.

10. A high-pressure water jet sandblasting cleaning control method based on the length of a metal sheet, characterized in that: The high-pressure water jet sandblasting cleaning control system based on the length of the metal sheet as described in claim 9 comprises the following steps: Step 1: The central processing unit receives a length signal and a width signal of the metal sheet (2), determines a speed signal of the conveying control module according to the length signal, generates a high-pressure water supply pressure signal according to the length signal, determines the number of openings of the sand supply valve according to the width signal, the central processing unit sequentially opens the high-pressure water supply control module, the conveying control module and the sand valve control module, transmits a speed signal to the conveying control module, transmits a high-pressure water supply pressure signal to the high-pressure water supply control module, sends a sand valve control signal to the sand valve control module according to the number of openings of the sand supply valve, and the conveying control module controls the rotation speed of the conveying roller (1) based on the speed signal to start transporting the metal sheet (2); Step 2: conveying the metal sheet (2) from the feeding position, starting the conveying roller (1) at the feeding position, the central processing unit calculates the number of the middle conveying roller (1) below the metal sheet (2) according to the position of the metal sheet (2) from the feeding position, the fixed spacing of the conveying roller (1), and the length of the metal sheet (2), and collects the real-time rotation speed of the conveying roller with the number, and updates the position of the metal sheet (2) in combination with the position of the metal sheet (2) from the feeding position after a collection time period, and at the same time, the central processing unit controls the conveying rollers (1) below the metal sheet (2) and in front of the movement to work according to the position signal and length signal of the metal sheet (2), and the remaining conveying rollers (1) above which there is no metal sheet (2) do not work, and the position of the passing metal sheet (2) is corrected by the photoelectric detection unit during the conveying process, the sand valve control module adjusts the opening amount of the sand valve according to the sand valve control signal, and the high-pressure water supply control module controls the high-pressure water supply water pressure of the high-pressure pump according to the high-pressure water supply water pressure signal, and starts to clean the metal sheet (2); Step 3: Stop conveying the metal sheet (2), and the central processing unit closes the sand valve control module, the conveying control module, and the high-pressure water supply control module in sequence to complete the cleaning of the metal sheet (2).

Images