Monomer metering pump spraying control system

Abstract

The invention discloses a single metering pump spraying control system which comprises a spraying gun, a metering pump, a servo motor, a feeding pump and a control device, the control device comprises a filling module and a feeding module, and a first valve control unit of the feeding module responds to received gun opening state information to control an inlet valve and an outlet valve; the gluing pre-enabling unit receives valve feeding state information and outputs a feeding enabling instruction, the feeding unit receives a real-time pulse value of the servo motor, and the feeding unit outputs a feeding completion instruction when the real-time pulse value of the servo motor is equal to a feeding target pulse value. A filling pre-enabling unit of the filling module responds to the feeding completion instruction to obtain spray gun state information, the filling pre-enabling unit obtains a real-time pulse value of a servo motor and outputs a filling enabling instruction when the real-time pulse value of the servo motor is smaller than a filling target pulse value, and a filling unit responds to the filling enabling instruction to supply materials; and material supply is stopped based on the filling completion state information.

Description

Technical Field

[0001] The invention relates to the technical field of feeding control of a monomer metering pump, and in particular to a spraying control system of a monomer metering pump. Background Art

[0002] The existing metering pump flow spray control method programs are all closed and cannot be read. This increases the difficulty of adaptation in the production process, does not support on-site independent transformation and independent debugging, and uses a semi-open-loop flow control system; or uses an open-loop flow control system, the flow control is not accurate, and the flow is greatly affected by the glue supply pressure, glue supply temperature, and glue supply viscosity. Summary of the invention

[0003] To solve at least one aspect of the above problems, the present invention provides a single metering pump spray control system, comprising: a spray gun; a metering pump, an outlet valve is provided at the outlet end of the metering pump, an outlet valve is provided at the inlet end of the metering pump, the metering pump is connected to the spray gun through the outlet valve; a servo motor, the servo motor is transmission-connected to the metering pump, the servo motor is used to drive the metering pump to output paint; a feeding pump, the feeding pump is connected to the metering pump through the inlet valve, the feeding pump is used to convey paint to the metering pump; a control device, the control device comprises a filling module and a feeding module, the feeding module comprises a first valve control unit, the first valve control unit controls the closing of the inlet valve and the opening of the outlet valve in response to the received shooting status information, and outputs the valve feeding status information, the glue coating pre-enabling unit outputs the feeding enabling instruction in response to the received valve feeding status information, the feeding unit The unit is connected to the servo motor in response to the feeding enable instruction to receive the real-time pulse value of the servo motor. The feeding unit outputs a feeding completion instruction when the real-time pulse value of the servo motor is equal to the feeding target pulse value. The filling module includes a filling pre-enabling unit and a filling unit. The filling pre-enabling unit obtains the spray gun status information in response to the feeding completion instruction. The filling pre-enabling unit obtains the real-time pulse value of the servo motor in response to the received unfired state information, and outputs the filling enable instruction when the real-time pulse value of the servo motor is less than the filling target pulse value. The filling unit is connected to the outlet valve and the inlet valve respectively in response to the received filling enable instruction, and controls the outlet valve to close, the inlet valve to open, and the servo motor to feed. The filling unit receives the filling status information, and closes the inlet valve and opens the outlet valve based on the filling completion status information, and stops the servo motor from feeding.

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

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

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

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

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

[0009] Preferably, the glue coating pre-enabling unit outputs a reset instruction in response to the received unfired state information, and the feeding unit disconnects the servo motor in response to the reset signal.

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

[0011] Preferably, the glue coating pre-enabling unit outputs a reset instruction in response to the target feeding pulse value.

[0012] Preferably, the control device further comprises a standby module, wherein the standby module connects the servo motor in response to a filling completion instruction to obtain and store a current pulse value of the servo motor.

[0013] The monomer metering pump spray control system of the present invention has the following beneficial effects: 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 processes are controlled based on the pulse value of the servo motor, thereby increasing the accuracy of paint flow control; and the control of the servo motor by the control device enables a large adjustable range of the flow formula. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0015] Figure 1 It shows a schematic structural diagram of a single metering pump spraying control system according to an embodiment of the present invention;

[0016] Figure 2 A schematic diagram of a feeding process of a monomer 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 monomer metering pump spraying control system according to an embodiment of the present invention is shown.

[0018] Reference numerals:

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

[0020] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0021] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an 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] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure proposes a single metering pump spray control system, including: a spray gun; a metering pump, an outlet valve is provided at the outlet end of the metering pump, an outlet 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, the servo motor is transmission-connected to the metering pump, and the servo motor is used to drive the metering pump to output paint; a feeding pump, the feeding pump is connected to the metering pump through the inlet valve, and the feeding pump is used to convey paint to the metering pump; a control device, the control device includes a filling module and a feeding module, the feeding module includes a first valve control unit, the first valve control unit controls the inlet valve to close and the outlet valve to open in response to the received shooting status information, and outputs the valve feeding status information, and the glue pre-enabling unit outputs the feeding enabling unit in response to the received valve feeding status information. Instruction, the feeding unit connects to the servo motor in response to the feeding enable instruction to receive the real-time pulse value of the servo motor, and the feeding unit outputs a feeding completion instruction when the real-time pulse value of the servo motor is equal to the feeding target pulse value. The filling module includes a filling pre-enabling unit and a filling unit. The filling pre-enabling unit obtains the spray gun status information in response to the feeding completion instruction. The filling pre-enabling unit obtains the real-time pulse value of the servo motor in response to the received unfired state information, and outputs the filling enable instruction when the real-time pulse value of the servo motor is less than the filling target pulse value. The filling unit connects the outlet valve and the inlet valve respectively in response to the received filling enable instruction, and controls the outlet valve to close, the inlet valve to open, and the servo motor to feed. The filling unit receives the filling status information, and closes the inlet valve, opens the outlet valve, and stops the servo motor from feeding based on the filling completion status information.

[0023] Specifically, Figure 1 As shown, the status information of the spray gun includes the firing status information and the non-firing status information. The metering pump adopts a single metering pump, which includes a cylindrical pump body and a piston, and the piston is connected to the rotor of the servo motor through a screw and a conveyor belt. The control device is electrically connected to the feed pump, the servo motor and the spray gun respectively, so that the control device controls the opening, closing and power of the feed pump, the control device controls the opening, closing and speed of the servo motor, and the control device controls the opening, closing and angle of the spray gun. In one embodiment, the control device includes a PLC (programmable logic controller) and a frequency converter, and the PLC is connected to the servo motor through the frequency converter.

[0024] During the filling process, the paint flowing out of the feed pump enters the pump body through the inlet valve of the metering pump. The piston of the metering pump moves upward along the pump body under the push of the paint until the paint fills the pump body of the metering pump (or reaches the preset volume), and the piston moves to the highest limit in the pump body (or the preset height limit corresponding to the preset volume). In the feeding stage, the feed pump stops feeding, the inlet valve is closed, the outlet valve is opened, the servo motor is started, the servo motor rotor is connected to the screw through the conveyor belt, and further, the piston is driven by the screw to move from top to bottom along the pump body of the metering pump, and the paint in the metering pump is squeezed by the piston movement to flow from the outlet valve to the spray gun.

[0025] In the feeding mode, the first valve opening control unit of the feeding module is electrically connected to the spray gun to receive the state information of the spray gun. When the spray gun outputs the opening state 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 states of the outlet valve and the inlet valve. When the inlet valve is in a closed state and the outlet valve is in an open state, the feeding condition is met, and the first valve control unit outputs the valve feeding state information. The glue pre-enabling unit is connected to the first valve control unit to receive the valve feeding state information. The glue pre-enabling unit is used to control the start and close of the feeding unit. The glue pre-enabling unit controls the start of the feeding unit by outputting the feeding enable instruction. The feeding unit supports the reception, processing and storage of data in the start state. When the glue pre-enabling unit outputs the reset instruction, the feeding unit is closed. The feeding unit refuses to receive, process and store data in the closed state. The feeding unit uses the real-time pulse value of the servo motor received at the initial start-up moment as the initial feeding pulse value, and determines the feeding target pulse value according to the initial feeding pulse value, and judges whether the feeding is completed by comparing the real-time pulse value and the filling target pulse value.

[0026] The rotor of the servo motor is connected to the piston of the metering pump through a conveyor belt and a lead screw. Each revolution of the servo motor rotor has a fixed corresponding relationship with the moving distance of the piston, and the number of pulses corresponding to each revolution of the servo motor is fixed. The default initial feeding moment is the highest point of the piston of the metering pump, and the completion of feeding corresponds to the lowest point of the piston. The distance between the lowest point and the highest point of the piston of the metering pump is fixed, so the target feeding pulse value can be determined based on the initial feeding pulse value.

[0027] For example, a method for confirming the servo motor feedback value corresponding to the high limit of a 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 through material pressure; and recording the servo motor pulse value as "0". Or in an external embodiment, it includes: disconnecting the metering pump from the servo motor; obtaining the upper and lower 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". A method for confirming the servo motor feedback value corresponding to the low limit of a metering pump includes: opening the metering pump outlet valve; closing the metering pump inlet valve; manually running the servo motor to make the metering pump piston run to the lowest limit; and recording the servo motor pulse value. The corresponding relationship between the servo motor pulse value and the piston movement distance is determined based on the servo motor feedback values ​​corresponding to the high limit of the metering pump and the low limit of the metering pump.

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

[0029] In some embodiments, the first valve control unit is further included to control the outlet valve to close and the inlet valve to open in response to the feeding completion instruction output by the feeding unit.

[0030] The filling pre-enabling unit is used to output the filling enable instruction and the reset instruction. The filling pre-enabling unit is connected to the feeding unit to receive the feeding completion instruction. The filling pre-enabling unit obtains the spray gun status information by receiving the connected spray gun, and connects the servo motor when the spray gun is in the unfired state to obtain the real-time pulse value of the servo motor. For example, the rotor of the servo motor rotates forward in the feeding state and reverses in the filling state. The pulse value of the servo motor continuously counts the forward and reverse rotations. The feeding unit records the feeding target pulse value in the feeding completion state, and determines the filling target pulse value according to the corresponding relationship between the number of pulses and the number of revolutions of the servo motor, and the corresponding relationship between the number of revolutions of the servo motor and the piston movement distance. The filling pre-enabling unit determines the filling target pulse value through the feeding target pulse value obtained by the feeding unit, and compares the real-time pulse value with the filling target pulse value. When the real-time pulse value of the servo motor is less than the filling target pulse value, the filling enable instruction is output. The filling unit is connected to the filling pre-enabling unit to receive an enabling instruction. The filling unit starts data reception, processing and storage in response to the filling enabling instruction. After the filling unit is started, the outlet valve and the inlet valve are connected, and the outlet valve and the inlet valve are adjusted to a filling state respectively. The filling state information includes filling completion and filling incomplete. When the filling is completed, the filling unit outputs a filling completion instruction. When the filling is incomplete, the filling unit controls the outlet valve and the inlet valve to maintain the filling state.

[0031] In some embodiments, the filling unit further includes controlling the feeding pump to start feeding in response to the received filling enable instruction, and shutting down the feeding pump to stop feeding based on the filling completion status information.

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

[0033] In some other embodiments, the control module further includes a receiving unit, the receiving unit is used to receive filling completion information input by the user, the filling unit is connected to the receiving unit to receive the filling completion information, and outputs a filling completion instruction.

[0034] In some embodiments, the filling pre-enabling unit outputs a reset instruction in response to the filling completion instruction, and the filling unit disconnects the servo motor, the outlet valve, and the inlet valve in response to the received reset instruction.

[0035] Specifically, the filling pre-enabling unit receives a filling completion instruction through the filling unit, and outputs a reset instruction to control the reset unit to stop receiving, processing and storing data. By disconnecting the filling unit from the servo motor, etc., the filling unit is prevented from interfering with the work of other units or modules, thereby increasing the stability of the system.

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

[0037] Specifically, when the filling enabling unit receives the firing state information, it determines that the spray gun is in the firing state, and outputs a reset instruction to avoid the filling unit affecting the pressure of the spray gun.

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

[0039] Specifically, the filling pre-enabling unit determines the amount of paint in the current metering pump through the real-time pulse value and the filling target pulse value. When the real-time pulse value is greater than or equal to the filling target pulse value, it is determined that the paint in the current metering pump has reached the maximum value, and a filling completion instruction is output, and a reset instruction is output at the same time.

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

[0041] Specifically, the gluing pre-enabling unit is simultaneously connected to the filling pre-enabling unit to obtain the status information of the filling pre-enabling unit, and when the filling pre-enabling unit outputs a reset instruction, it outputs the non-filling enabling information to the gluing pre-enabling unit. The gluing pre-enabling unit evaluates the current system status through the status of the filling pre-enabling unit to prevent the filling module from affecting the feeding module.

[0042] In some embodiments, the glue coating pre-enabling unit outputs a reset instruction in response to the received unfired state information, and the feeding unit disconnects the servo motor in response to the reset signal.

[0043] Specifically, the glue coating pre-enabling unit determines that the spray gun is not currently executing the glue coating program through the unfired state information, and then controls the feeding unit to stop data receiving, processing and storage by outputting a reset instruction.

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

[0045] Specifically, during the feeding process, the glue coating pre-enabling unit determines the state of the outlet valve by obtaining the outlet valve information. When the outlet valve is closed, the feeding pipeline is different, and the feeding unit needs to be controlled to stop feeding through a reset instruction.

[0046] In some embodiments, the glue pre-enabling unit outputs a reset instruction in response to the target feeding pulse value.

[0047] Specifically, the glue coating pre-enabling unit is connected to the servo motor to obtain a real-time pulse value. When the real-time pulse value is equal to a target feeding value, the glue coating pre-enabling unit controls the feeding unit to stop feeding through a reset instruction.

[0048] In some embodiments, the control device further comprises a standby module, which connects the servo motor in response to the filling completion instruction to obtain and store a current pulse value of the servo motor.

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

[0050] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the present invention.

Claims

1. A single metering pump spray control system, characterized in that: include: spray gun; A metering pump, wherein an outlet valve is arranged at the outlet end of the metering pump, an outlet valve is arranged at the inlet end of the metering pump, and the metering pump is connected with the spray gun through the outlet valve; A servo motor, the servo motor is drivingly connected to the metering pump, and the servo motor is used to drive the metering pump to output the paint; A feed pump, the feed pump is connected to the metering pump through the inlet valve, and the feed pump is used to deliver paint to the metering pump; A control device, the control device includes a filling module and a feeding module, the feeding module includes a first valve control unit, the first valve control unit controls the closing of the inlet valve and the opening of the outlet valve in response to the received shooting status information, and outputs the valve feeding status information, the glue coating pre-enabling unit outputs a feeding enable instruction in response to the received valve feeding status information, the feeding unit connects to the servo motor in response to the feeding enable instruction to receive the real-time pulse value of the servo motor, the feeding unit outputs a feeding completion instruction when the real-time pulse value of the servo motor is equal to the feeding target pulse value, the filling module includes a filling pre-enabling unit element and a filling unit, the filling pre-enabling unit acquires the spray gun status information in response to the feeding completion instruction, the filling pre-enabling unit acquires the real-time pulse value of the servo motor in response to the received unfired status information, and outputs the filling enabling instruction when the real-time pulse value of the servo motor is less than the filling target pulse value, the filling unit connects the outlet valve and the inlet valve respectively in response to the received filling enabling instruction, controls the outlet valve to close, the inlet valve to open, and starts the servo motor to feed, the filling unit receives the filling status information, and closes the inlet valve and opens the outlet valve based on the filling completion status information, and stops the servo motor to feed.

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

3. The system according to claim 2, characterized in that The filling pre-enabling unit outputs a reset command in response to a filling completion command, and the filling unit disconnects the servo motor, the outlet valve, and the inlet valve in response to the received reset command.

4. The system according to claim 3, characterized in that The filling pre-enabling unit outputs a reset instruction in response to the received firing status information.

5. The system according to claim 4, characterized in that The filling pre-enabling unit outputs a filling completion instruction when the real-time pulse value is greater than or equal to the filling target pulse value.

6. The system according to claim 5, characterized in that The glue coating pre-enabling unit receives the non-filling enabling information output by the filling pre-enabling unit, and outputs a feeding start signal when the filling pre-enabling state is the non-filling enabling information.

7. The system according to claim 6, characterized in that The glue coating pre-enabling unit outputs a reset instruction in response to the received unfired state information, and the feeding unit disconnects the servo motor in response to the reset signal.

8. The system according to claim 6, characterized in that The glue coating pre-enabling unit outputs a reset instruction in response to the received outlet valve closing information.

9. The device according to claim 8, characterized in that The glue coating pre-enabling unit outputs a reset instruction in response to the target feeding pulse value.

10. The device according to claim 1, characterized in that The control device further includes a standby module, which connects the servo motor in response to a filling completion instruction to obtain and store a current pulse value of the servo motor.

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