A single metering pump spraying control system

Abstract

This invention discloses a single-unit metering pump spraying control system, comprising: a spray gun, a metering pump, a servo motor, a feed pump, and a control device. The control device includes a filling module and a feed module. The first valve control unit of the feed module controls the inlet valve and the outlet valve in response to received gun opening status information. The glue pre-enabling unit receives valve feed status information and outputs a feed enable command. The feed unit receives the real-time pulse value of the servo motor. When the real-time pulse value of the servo motor is equal to the feed target pulse value, the feed unit outputs a feed completion command. The filling pre-enabling unit of the filling module obtains the spray gun status information in response to the feed completion command. The filling pre-enabling unit obtains the real-time pulse value of the servo motor and outputs a filling enable command when the real-time pulse value of the servo motor is less than the filling target pulse value. The filling unit feeds material in response to the filling enable command and stops feeding material based on the filling completion status information.

Description

Technical Field

[0001] This invention relates to the field of material supply control technology for unit metering pumps, and more specifically, to a unit metering pump spraying control system. Background Technology

[0002] Existing metering pump flow control methods for spraying involve completely closed-loop programs that cannot be read. This increases the difficulty of adaptation during production, does not support on-site independent modification and debugging, and uses a semi-open-loop flow control system; or, if an open-loop flow control system is used, the flow control is inaccurate, and the flow rate is greatly affected by the adhesive supply pressure, adhesive supply temperature, and adhesive viscosity. Summary of the Invention

[0003] To address at least one aspect of the aforementioned problems, the present invention provides a single-unit metering pump spraying control system, comprising: a spray gun; a metering pump, wherein an outlet valve is provided at the outlet end of the metering pump, and an inlet valve is provided at the inlet end of the metering pump, the metering pump being connected to the spray gun through the outlet valve; a servo motor, the servo motor being driven by the metering pump, the servo motor being used to drive the metering pump to output paint; a feed pump, the feed pump being connected to the metering pump through the inlet valve, the feed pump being used to deliver paint to the metering pump; and a control device, the control device comprising a filling module and a feed module, the feed module comprising a first valve control unit, the first valve control unit controlling the inlet valve to close and the outlet valve to open in response to received gun opening status information, and outputting valve feed status information, the glue pre-enabling unit outputting a feed enable command in response to received valve feed status information, the feed module... The unit responds to the feeding enable command by connecting to the servo motor to receive the real-time pulse value of the servo motor. When the real-time pulse value of the servo motor is equal to the feeding target pulse value, the feeding unit outputs a feeding completion command. The filling module includes a filling pre-enable unit and a filling unit. The filling pre-enable unit responds to the feeding completion command by acquiring the spray gun status information. The filling pre-enable unit responds to the received non-opening status information by acquiring the real-time pulse value of the servo motor and outputs a filling enable command when the real-time pulse value of the servo motor is less than the filling target pulse value. The filling unit responds to the received filling enable command by connecting to the outlet valve and the inlet valve respectively, and controls the outlet valve to close, the inlet valve to open, and the servo motor to stop feeding. The filling unit receives filling status information and closes the inlet valve and opens the outlet valve based on the filling completion status information, and starts the servo motor to feed.

[0004] Preferably, the filling unit connects to the servo motor in response to the received filling start command, so as to receive the real-time pulse value of the servo motor, and the filling unit outputs the filling completion command when the real-time pulse value of the servo motor is equal to the target filling pulse value.

[0005] Preferably, the filling pre-enable unit outputs a reset command in response to the filling completion command, and the filling unit disconnects from the servo motor, the outlet valve, and the inlet valve in response to the received reset command.

[0006] Preferably, the pre-enable unit outputs a reset command in response to the received firing status information.

[0007] Preferably, the fill pre-enable unit outputs a fill completion command when the real-time pulse value is greater than or equal to the fill target pulse value.

[0008] Preferably, the glue application pre-enabling unit receives the unfilled enable information output by the filling pre-enabling unit, and outputs a feeding start signal when the filling pre-enabling state is unfilled enable information.

[0009] Preferably, the glue application pre-enable unit outputs a reset command in response to the received non-fired state information, and the feeding unit disconnects the servo motor in response to the reset command.

[0010] Preferably, the adhesive pre-enabling unit outputs a reset command in response to the received outlet valve closing information.

[0011] Preferably, the adhesive pre-enabling unit outputs a reset command in response to the target pulse value of the material supply.

[0012] Preferably, the control device further includes a standby module, which connects to the servo motor in response to a fill-up completion command to acquire and store the current pulse value of the servo motor.

[0013] The single-unit metering pump spraying control system of the present invention has the following advantages: the filling module and the feeding module in the control device are completely independent and will not interfere with each other; the hardware has high versatility; the feeding and filling process is controlled by the pulse value of the servo motor, which increases the accuracy of paint flow control; and the flow formula can be adjusted within a wide range by controlling the servo motor through the control device. Attached Figure Description

[0014] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0015] Figure 1 A schematic diagram of the structure of a unit metering pump spraying control system according to an embodiment of the present invention is shown;

[0016] Figure 2 A schematic diagram of the material supply process of the unit metering pump spraying control system according to an embodiment of the present invention is shown;

[0017] Figure 3 A schematic diagram of the filling process of a unit metering pump spraying control system according to an embodiment of the present invention is shown.

[0018] Figure label:

[0019] 1. Feed pump; 2. Pipeline; 3. Inlet valve; 4. Outlet valve; 5. Metering pump; 6. Servo motor; 7. Belt; 8. Piston; 9. Lead screw; 10. Spray gun; 11. PLC; 12. Frequency converter. Detailed Implementation

[0020] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0021] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0022] To at least partially address one or more of the aforementioned problems and other potential issues, embodiments of this disclosure propose a single-unit metering pump spraying control system, comprising: a spray gun; a metering pump, wherein an outlet valve is provided at the outlet end of the metering pump, and an inlet valve is provided at the inlet end of the metering pump, and the metering pump is connected to the spray gun through the outlet valve; a servo motor, which is drivenly connected to the metering pump and is used to drive the metering pump to output paint; a feed pump, which is connected to the metering pump through the inlet valve and is used to deliver paint to the metering pump; and a control device, which includes a filling module and a feed module, the feed module including a first valve control unit, which controls the inlet valve to close and the outlet valve to open in response to received gun opening status information, and outputs valve feed status information; and a coating pre-enabling unit outputs feed enable in response to received valve feed status information. The feeding unit responds to the feeding enable command by connecting to the servo motor to receive the real-time pulse value of the servo motor. When the real-time pulse value of the servo motor equals the target feeding pulse value, the feeding unit outputs a feeding completion command. The filling module includes a filling pre-enable unit and a filling unit. The filling pre-enable unit responds to the feeding completion command by acquiring the spray gun status information. The filling pre-enable unit responds to the received non-opening status information by acquiring the real-time pulse value of the servo motor and outputs a filling enable command when the real-time pulse value of the servo motor is less than the target filling pulse value. The filling unit responds to the received filling enable command by connecting to the outlet valve and the inlet valve respectively, and controls the outlet valve to close, the inlet valve to open, and the servo motor to stop feeding. The filling unit receives the filling status information and closes the inlet valve, opens the outlet valve, and starts the servo motor to feed based on the filling completion status information.

[0023] Specifically, such as Figure 1 As shown, the spray gun's status information includes both on-state and off-state information. The metering pump is a single-unit metering pump, comprising a cylindrical pump body and a piston. The piston is connected to the rotor of the servo motor via a lead screw and a conveyor belt. The control device is electrically connected to the feed pump, servo motor, and spray gun, enabling the control device to control the feed pump's on / off state and power, the servo motor's on / off state and speed, and the spray gun's on / off state and angle. In one embodiment, the control device includes a PLC (Programmable Logic Controller) and a frequency converter; the PLC is connected to the servo motor via the frequency converter.

[0024] During the filling process, the paint flowing from the feed pump enters the pump body through the inlet valve of the metering pump. The piston of the metering pump moves upwards along the pump body under the pressure of the paint until the pump body is full (or reaches a preset volume). The piston then moves to the highest limit within the pump body (or the preset height limit corresponding to the preset volume). During the feeding phase, the feed pump stops feeding, the inlet valve closes, the outlet valve opens, and the servo motor starts. The servo motor rotor is connected to a lead screw via a conveyor belt, and the lead screw further drives the piston to move downwards along the pump body of the metering pump. This piston movement compresses the paint within the metering pump, causing it to flow from the outlet valve to the spray gun.

[0025] In feeding mode, the first valve control unit of the feeding module is electrically connected to the spray gun to receive the spray gun's status information. When the spray gun outputs the open status information, the first valve control unit closes the inlet valve and the outlet valve. The first valve control unit is also used to evaluate the status of the outlet valve and the inlet valve. When the inlet valve is closed and the outlet valve is open, the feeding conditions are met, and the first valve control unit outputs valve feeding status information. The glue pre-enabling unit is connected to the first valve control unit to receive the valve feeding status information. The glue pre-enabling unit is used to control the start and stop of the feeding unit. The glue pre-enabling unit controls the feeding unit to start by outputting a feeding enable command. In the start state, the feeding unit supports data reception, processing, and storage. When the glue pre-enabling unit outputs a reset command, the feeding unit stops. In the stop state, the feeding unit refuses to receive, process, and store data. The feeding unit uses the real-time pulse value of the servo motor received at the initial start moment as the initial feeding pulse value, determines the target feeding pulse value based on the initial feeding pulse value, and judges whether feeding is completed by comparing the real-time pulse value and the target feeding pulse value.

[0026] The servo motor rotor is connected to the metering pump piston via a conveyor belt and lead screw. Therefore, there is a fixed correspondence between each revolution of the servo motor rotor and the piston's movement distance, and the number of pulses corresponding to each revolution of the servo motor is also fixed. The default initial feeding moment is at the highest point of the metering pump piston, and the feeding completion corresponds to the lowest point of the piston. The distance between the lowest and highest points of the metering pump piston is fixed; therefore, the target feeding pulse value can be determined based on the initial feeding pulse value.

[0027] For example, the method for confirming the servo motor feedback value corresponding to the high limit of the metering pump includes: opening the metering pump inlet valve; closing the metering pump outlet valve; disconnecting the servo motor enable and releasing the servo motor brake; filling the metering pump piston to the mechanical upper limit by material pressure; and recording the servo motor pulse value as "0". Alternatively, in another embodiment, it includes: disconnecting the metering pump from the servo motor; obtaining the upper and lower limit mechanical physical height values ​​of metering pumps of different brands; manually rotating the metering pump to the upper limit; connecting the metering pump belt to the servo motor; and recording the servo motor pulse value as "0". The method for confirming the servo motor feedback value corresponding to the low limit of the metering pump includes: opening the metering pump outlet valve; closing the metering pump inlet valve; manually running the servo motor to move the metering pump piston to the lowest limit; and recording the servo motor pulse value. The correspondence between the servo motor pulse value and the piston movement distance is determined based on the servo motor feedback values ​​corresponding to the high and low limits of the metering pump.

[0028] In some embodiments, the feeding unit receives a flow rate adjustment command and controls the rotational speed of the servo motor in response to the received flow rate adjustment command. For example, the flow rate adjustment command is a user-input command. The material volume V is equal to the product of the piston bottom area S and the height H, where the piston bottom area can be measured or obtained from the metering pump manufacturer. Volume V / unit time T = material flow rate Q (the volume of material squeezed by the metering pump per unit time). For example, a flow rate of 20 ml / s requires the metering pump to squeeze 20 ml in 1 second. Knowing the bottom area, the distance or height the metering pump piston should travel is determined according to H = V / S, and the height H the metering pump piston travels in time T is calculated according to Q = V / T.

[0029] In some embodiments, the system further includes a first valve control unit that controls the outlet valve to close and the inlet valve to open in response to a feeding completion command output by the feeding unit.

[0030] The fill pre-enable unit is used to output fill enable and reset commands. It connects to the feeding unit to receive feeding completion commands. The fill pre-enable unit receives spray gun status information from the connected spray gun and connects to the servo motor when the spray gun is in the off-state to obtain the real-time pulse value of the servo motor. For example, the servo motor rotor rotates forward in feeding mode and reverses in filling mode. The servo motor pulse value is continuously counted for both forward and reverse rotation. The feeding unit records the target feeding pulse value at the feeding completion state. Based on the correspondence between the servo motor pulse count and rotation count, and the correspondence between the servo motor rotation count and piston movement distance, the target filling pulse value is determined. The fill pre-enable unit determines the target filling pulse value from the feeding target pulse value obtained by the feeding unit and compares the real-time pulse value with the target filling pulse value. When the real-time pulse value of the servo motor is less than the target filling pulse value, it outputs a fill enable command. The filling unit connects to the filling pre-enable unit to receive an enable command. In response to the filling enable command, the filling unit initiates data reception, processing, and storage. After starting, the filling unit connects to the outlet valve and inlet valve, and adjusts both valves to the filling state. The filling status information includes whether filling is complete or incomplete. When filling is complete, the filling unit outputs a filling complete command; when filling is incomplete, the filling unit controls the outlet valve and inlet valve to maintain the filling state.

[0031] In some embodiments, the filling unit responds to and receives a filling enable command to control the feeding pump to start feeding, and shuts down the feeding pump based on the filling completion status information to stop feeding.

[0032] In some embodiments, the filling unit connects to the servo motor in response to the received filling start command, so as to receive the real-time pulse value of the servo motor, and the filling unit outputs a filling completion command when the real-time pulse value of the servo motor is equal to the target filling pulse value.

[0033] In other embodiments, the control module further includes a receiving unit for receiving fill completion information input by the user, and a filling unit connected to the receiving unit to receive the fill completion information and output a fill completion command.

[0034] In some embodiments, the fill pre-enable unit outputs a reset command in response to a fill completion command, and the fill unit disconnects from the servo motor, the outlet valve, and the inlet valve in response to the received reset command.

[0035] Specifically, the fill pre-enable unit receives the fill completion command through the fill unit and outputs a reset command to control the reset unit to stop data reception, processing, and storage. By disconnecting the fill unit from servo motors, etc., interference with the operation of other units or modules is avoided, increasing system stability.

[0036] In some embodiments, the pre-enable unit outputs a reset command in response to received firing status information.

[0037] Specifically, when the filling enable unit receives the gun firing status information, it determines that the spray gun is in the firing state and outputs a reset command to prevent the filling unit from affecting the pressure of the spray gun.

[0038] In some embodiments, the fill pre-enable unit outputs a fill completion command when the real-time pulse value is greater than or equal to the fill target pulse value.

[0039] Specifically, the fill pre-enable unit determines the current paint level in the metering pump by using the real-time pulse value and the fill target pulse value. When the real-time pulse value is greater than or equal to the fill target pulse value, it determines that the paint level in the metering pump has reached its maximum value, and then outputs a fill completion command and a reset command.

[0040] In some embodiments, the glue application pre-enable unit receives the unfilled enable information output by the filling pre-enable unit, and outputs a feeding start signal when the filling pre-enable state is unfilled enable information.

[0041] Specifically, the glue application pre-enable unit is also connected to the fill pre-enable unit to obtain the status information of the fill pre-enable unit. When the fill pre-enable unit outputs a reset command, it outputs an unfilled information to the glue application pre-enable unit. The glue application pre-enable unit evaluates the current system status through the status of the fill pre-enable unit to prevent the fill module from affecting the material supply module.

[0042] In some embodiments, the glue application pre-enable unit outputs a reset command in response to the received non-opening state information, and the feeding unit disconnects the servo motor in response to the reset command.

[0043] Specifically, the glue application pre-enabling unit determines that the spray gun is not currently executing the glue application procedure based on the non-opening status information, and then controls the material supply unit to stop receiving, processing, and storing data by outputting a reset command.

[0044] In some embodiments, the adhesive pre-enabling unit outputs a reset command in response to received outlet valve closing information.

[0045] Specifically, during the material feeding process, the glue pre-enabling unit determines the status of the outlet valve by acquiring the outlet valve information. When the outlet valve is closed, if the material feeding pipeline is different, a reset command is required to control the material feeding unit to stop feeding.

[0046] In some embodiments, the adhesive pre-enabling unit outputs a reset command in response to the target pulse value of the material supply.

[0047] Specifically, the glue application pre-enable unit is connected to a servo motor to obtain real-time pulse values. When the real-time pulse value is equal to the target pulse value for material feeding, the glue application pre-enable unit controls the material feeding unit to stop feeding through a reset command.

[0048] In some embodiments, the control device further includes a standby module that connects to the servo motor in response to a fill-up completion command to acquire and store the current pulse value of the servo motor.

[0049] Specifically, the motor module is connected to the filling unit to receive a filling completion command. When the filling unit receives the completion command, the standby module connects to the filling pre-enable unit and the feeding pre-enable unit. When the filling pre-enable unit outputs non-filling enable information and the feeding pre-enable unit outputs non-feeding enable information, the standby module connects to the servo motor to receive and store the current pulse value. In some embodiments, the standby module connects to the feeding module in response to the firing status information and outputs its stored current pulse value.

[0050] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand this document.

Claims

1. A single-unit metering pump spraying control system, characterized in that, include: spray gun; A metering pump is provided with an outlet valve at its outlet end and an inlet valve at its inlet end. The metering pump is connected to the spray gun through the outlet valve. A servo motor is connected to the metering pump and is used to drive the metering pump to output coating. A feed pump, which is connected to the metering pump via the inlet valve, is used to deliver paint to the metering pump; The control device includes a filling module and a feeding module. The feeding module includes a first valve control unit, which controls the inlet valve to close and the outlet valve to open in response to received gun-opening status information, and outputs valve feeding status information. The feeding module includes a glue pre-enabling unit and a feeding unit. The glue pre-enabling unit outputs a feeding enable command in response to received valve feeding status information. The feeding unit connects to the servo motor in response to the feeding enable command to receive the real-time pulse value of the servo motor. The feeding unit outputs a feeding completion command when the real-time pulse value of the servo motor equals the feeding target pulse value. The filling module includes a filling pre-enabling unit and a filling unit. The filling pre-enabling unit acquires spray gun status information in response to the feeding completion command. The filling pre-enabling unit acquires the real-time pulse value of the servo motor in response to received gun-not-opening status information, and feeds the servo motor accordingly. When the real-time pulse value of the motor is less than the target filling pulse value, a filling enable command is output. The filling unit, in response to the received filling enable command, connects to the outlet valve and the inlet valve respectively, and controls the outlet valve to close, the inlet valve to open, and stops the servo motor feeding. The filling unit receives filling status information, and based on the filling completion status information, closes the inlet valve and opens the outlet valve, and starts the servo motor feeding. The filling pre-enable unit, in response to the filling completion command, outputs a reset command. The filling unit, in response to the received reset command, disconnects from the servo motor, the outlet valve, and the inlet valve. The glue application pre-enable unit simultaneously connects to the filling pre-enable unit to obtain the status information of the filling pre-enable unit. When the filling pre-enable unit outputs a reset command, it outputs unfilled enable information to the glue application pre-enable unit. When the filling pre-enable status is unfilled enable information, it outputs a feeding start signal.

2. The system according to claim 1, characterized in that, The filling unit connects to the servo motor in response to the received filling start command, so as to receive the real-time pulse value of the servo motor. When the real-time pulse value of the servo motor is equal to the target filling pulse value, the filling unit outputs a filling completion command.

3. The system according to claim 2, characterized in that, The pre-enable unit outputs a reset command in response to the received firing status information.

4. The system according to claim 3, characterized in that, The fill pre-enable unit outputs a fill completion command when the real-time pulse value is greater than or equal to the fill target pulse value.

5. The system according to claim 4, characterized in that, The glue application pre-enable unit outputs a reset command in response to the received non-fired state information, and the feeding unit disconnects the servo motor in response to the reset command.

6. The system according to claim 4, characterized in that, The adhesive pre-enabling unit outputs a reset command in response to the received outlet valve closing information.

7. The system according to claim 6, characterized in that, The adhesive pre-enabling unit responds to the target pulse value of the material supply by outputting a reset command.

8. The system according to claim 1, characterized in that, The control device further includes a standby module, which connects to the servo motor in response to a fill-up completion command to acquire and store the current pulse value of the servo motor.

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