CN210422996U

CN210422996U - Double-drive-shaft melt pump

Info

Publication number: CN210422996U
Application number: CN201920279585.3U
Authority: CN
Inventors: 李福勇; 赵国华; 王杰
Original assignee: Zhengzhou Vowa Mechanical Co ltd
Current assignee: Zhengzhou Vowa Mechanical Co ltd
Priority date: 2019-03-06
Filing date: 2019-03-06
Publication date: 2020-04-28
Anticipated expiration: 2029-03-06

Abstract

The utility model provides a dual-drive shaft melt pump, including the melt pump body that has first drive shaft and second drive shaft, first drive shaft power is connected with first power device, second drive shaft power is connected with second power device, first drive shaft equals with second drive shaft speed, both output torques of first power device and second power device have certain difference for improve the technical problem of melt pump inner gearing degree of meshing when solving the engaging force that reduces between the melt pump inner gearing.

Description

Double-drive-shaft melt pump

Technical Field

The utility model relates to a dual drive axle melt pump.

Background

The melt pump is mainly used for conveying, pressurizing and metering high-temperature and high-viscosity polymer melts. The melt pump is widely applied to extrusion molding of plastic, resin, rubber and chemical fiber products at foreign countries, such as the industries of granulation, films, pipes, plates, sheets, artificial fibers, optical fibers, medical plastic catheters and the like, and is gradually adopted and applied by industrial people in domestic markets along with the increasing development of mechanical industry. The melt pump conveys materials by means of two gears which are meshed with each other, and a driving shaft gear of the traditional melt pump provides power to drive a driven shaft gear to operate. When the melt pump is used for conveying materials with extremely high viscosity, such as rubber, the melt pump with small discharge capacity needs large driving power due to high material viscosity, the meshing force between gears is large, and the conveyed materials have no lubricating effect, so that the friction force between the tooth surface of a driving shaft gear and the tooth surface of a driven shaft gear is very large, and as a result, the gears of the melt pump are damaged due to abrasion in a short time.

The utility model discloses a utility model patent that the name is "biax external lubrication melt pump", the grant bulletin number is CN 203257670U, the grant bulletin date is 2013.10.30 among the prior art contains melt pump, shaft coupling, gear distributor box. The gear distribution box is composed of an input shaft and a driven shaft, when the gear distribution box operates, the power of the input shaft is divided into two parts, so that the two shafts have power, and the two output shafts are connected with the two gear shafts of the melt pump through the shaft coupling, so that the two gear shafts of the melt pump have power. The power input of the melt pump is completed by two shafts, and compared with a melt pump with single shaft power, the meshing force between the gears is reduced by half; however, due to the influence of assembly precision, the gear in the melt pump cannot be well meshed, and further, a gap is formed between the high-pressure cavity and the low-pressure cavity of the melt pump, so that the efficiency of the melt pump is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a dual-drive shaft melt pump to improve the technical problem of melt pump internal gear meshing degree when solving the meshing force that reduces between the melt pump internal gear.

The technical scheme of the utility model is realized like this: the dual-drive-shaft melt pump comprises a melt pump body with a first drive shaft and a second drive shaft, wherein the first drive shaft is in power connection with a first power device, the second drive shaft is in power connection with a second power device, the rotating speeds of the first drive shaft and the second drive shaft are equal, and the output torques of the first power device and the second power device have a certain difference value.

Furthermore, the first power device and the second power device are both servo motors with speed reducers, the servo motor of the first power device is provided with a first servo motor driver, the servo motor of the second power device is provided with a second servo motor driver, and the first servo motor driver and the second servo motor driver are jointly connected with a controller used for sending control instructions.

Furthermore, the first driving shaft and the second driving shaft are distributed at two corresponding ends of the melt pump body.

A dual-drive-shaft melt pump control method is based on the dual-drive-shaft melt pump and comprises the following steps: 1) the first servo motor driver and the second servo motor driver receive control signals sent by the controller; 2) the first servo motor driver controls the rotating speed of the first power device, the second servo motor driver controls the rotating speed of the second power device, and the first servo motor driver and the second servo motor driver are arranged to work in a speed mode and set the same speed so that the rotating speeds of the first power device and the second power device are the same; 3) the second servo motor driver sets a torque limit to limit the output torque of the second servo motor to be smaller than the output torque of the first servo motor by a certain difference.

Furthermore, the torque limit value of the second servo driver and the torque output of the first servo motor are in a fixed proportional relation and are smaller than the torque output value of the first servo motor.

Further, the controller is a PLC control system, the controller is in communication connection with the first servo motor driver and the second servo motor driver through a PROFINET protocol, the controller reads the output torque of the servo motor of the first servo driver through PROFINET communication, the output torque is written into the second servo motor driver after calculation, and the value is used as a torque limit value of the second servo driver.

Further, a molding servo control program file is arranged in the PLC control system.

By adopting the technical scheme, the beneficial effects of the utility model are that: the dual-drive shaft melt pump of the utility model is provided with the independent power devices respectively at the first drive shaft and the second drive shaft so as to lead the first drive shaft and the second drive shaft to be capable of respectively and independently adjusting the respective power input, thus reducing the meshing force between the gears and lightening the abrasion of the gears; the torque difference between the two shafts is controlled, and good meshing of gears on the shafts is guaranteed. The good meshing eliminates the clearance between the gears and improves the efficiency of the melt gear pump.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural view of the present invention;

wherein: 1. the device comprises a first driving shaft, a second driving shaft, a melt pump body, a first power device, a second power device, a first servo motor driver, a second servo motor driver, a controller and a second servo motor driver, wherein the first driving shaft 2, the second driving shaft 3, the melt pump body 4, the first power device 5, the second power device 6, the first servo motor driver 7 and the second servo motor driver 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model provides a dual drive axle melt pump embodiment 1, as shown in fig. 1, including the melt pump body 3 that has first drive shaft 1 and second drive shaft 2, first drive shaft and second drive shaft distribute in the corresponding both ends of melt pump body, this internal a pair of meshing gear of locating first drive shaft, second drive epaxial respectively that is equipped with of melt pump, first drive shaft power is connected with first power device 4, first power device drives first drive shaft and rotates, second drive shaft power is connected with second power device 5, second power device drives the second drive shaft and rotates. The rotating speeds of the first driving shaft and the second driving shaft are equal, the output torques of the first power device and the second power device have a certain difference value, the first power device and the second power device are both servo motors with speed reducers, the first power device is provided with a first servo motor driver 6, the second power device is provided with a second servo motor driver 7, and the first servo motor driver and the second servo motor driver are connected with a controller 8 for sending instructions. The controller 8 is a PLC control system, and the controller 8 is in communication connection with the first servo motor driver 6 and the second servo motor driver 7 through a PROFINET protocol. And a forming servo control program file is arranged in the PLC control system, so that the servo motor can rotate according to set parameters such as speed, torque and the like. The two servo controllers are set to work in a speed mode, and the same rotating speed is set, so that the rotating speed of the first power device is the same as that of the second power device; the second servo controller limits the output torque of the servo motor, and the limit value is set to be the value obtained by multiplying the torque output value of the first servo by a coefficient smaller than 1. The controller reads the torque output value of the first servo through PROFINET communication, calculates the value and transmits the value into the driver of the second servo motor to be used as the torque limit value output by the second servo motor, and updates the torque limit value output by the second servo controller in real time. The dual-drive-shaft melt pumps with different sizes are different in required driving power, the servo motors and servo motor drivers are different in model, for example, a dual-drive-shaft melt pump with the displacement of 200CC is taken as an example, a controller can adopt Siemens S7-1200PLC with the specific model of 6ES 7215-1 AG40-0XB0, the Siemens servo motor drivers with the model of 6SL3210-5FE17-0UF0 and the Siemens servo motor drivers with the model of 1FL6096-1AC61-0AA 1. When the melt pump with the double drive shafts and the discharge capacity of 200CC is used for conveying rubber and the outlet pressure is 15MPa, the torque limit value of the second servo motor is set to be 0.85 times of the output torque of the first servo motor to be optimal.

In other embodiments, the torque limit of the second servomotor is the torque output of the first servomotor minus a constant.

An embodiment 1 of a dual-drive-shaft melt pump control method is shown in fig. 1, and based on the dual-drive-shaft melt pump, the dual-drive-shaft melt pump control method includes the following steps: the method comprises the following steps: 1) the first servo driver and the second servo driver receive control signals sent by the controller; 2) the first servo driver controls the rotating speed of the first power device, and the second servo driver controls the rotating speed of the second power device so that the rotating speeds of the first power device and the second power device are the same; 3) the second servo driver limits the servo output torque to be smaller than the output torque of the first servo. The controller is a PLC control system, the controller is in communication connection with the first servo motor driver and the second servo motor driver through a PROFINET protocol, the controller reads the output torque of the servo motor of the first servo driver through PROFINET communication, the output torque is written into the second servo motor driver after calculation, the value is used as the output torque limit value of the second servo motor, a forming servo control program file is arranged in the PLC control system, and the servo motor rotates according to the set speed, the set torque and other parameters. The two servo controllers are set to work in a speed mode, and the same rotating speed is set, so that the rotating speed of the first power device is the same as that of the second power device; the second servo controller limits the output torque, and the limit value is set to a value obtained by multiplying the torque output value of the first servo by a coefficient smaller than 1. The controller reads the torque output value of the first servo through PROFINET communication, the calculated value is transmitted to the second servo driver, and the output torque limit value of the second servo controller is updated in real time. The dual-drive-shaft melt pumps with different sizes are different in required driving power, the servo motors and servo motor drivers are different in model, for example, a dual-drive-shaft melt pump with the displacement of 200CC is taken as an example, a controller can adopt Siemens S7-1200PLC with the specific model of 6ES 7215-1 AG40-0XB0, the Siemens servo driver with the model of 6SL3210-5FE17-0UF0 and the Siemens servo motor with the model of 1FL6096-1AC61-0AA 1. When the melt pump with the double drive shafts and the discharge capacity of 200CC is used for conveying rubber and the outlet pressure is 15MPa, the torque of the servo motor is optimally limited to be 0.85 time of the output torque of the first servo motor.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The dual-drive-shaft melt pump comprises a melt pump body with a first drive shaft and a second drive shaft, and is characterized in that the first drive shaft is in power connection with a first power device, the second drive shaft is in power connection with a second power device, the rotating speeds of the first drive shaft and the second drive shaft are equal, and the output torques of the first power device and the second power device are different.

2. A dual-drive-shaft melt pump according to claim 1, wherein the first power device and the second power device are both servo motors with speed reducers, the servo motor of the first power device is provided with a first servo motor driver, the servo motor of the second power device is provided with a second servo motor driver, and the first servo motor driver and the second servo motor driver are commonly connected with a controller for sending out control commands.

3. A dual-drive-shaft melt pump according to claim 2, wherein the first drive shaft and the second drive shaft are distributed at opposite ends of the melt pump body.

4. A dual-drive-shaft melt pump according to claim 3, wherein the controller is a PLC control system, and the controller is in communication connection with the first servo motor driver and the second servo motor driver according to PROFINET protocol.

5. A dual-drive-shaft melt pump according to claim 4, wherein a molding servo control program file is provided within the PLC control system.