Zhishan GD 2 in 1 series servo system has fast response, accurate positioning, short setting time, and stable operation. After being used by customers, the knitted sweaters and other knitted fabrics woven from the mountain servo system used in the computerized flat knitting machine can meet the requirements, which can effectively improve the production efficiency.
1. Introduction
Computerized flat knitting machine is
used for knitting woolen sweater, it is the application of electromechanical
integration in knitting machinery. Since the advent of the first commercial
flat knitting machine in 1975, after more than 20 years of development, the
flat knitting machine has reached a relatively complete level and has now
become the development direction of flat knitting machines. Compared with
ordinary flat knitting machines, computer flat knitting machines have the
advantages of a high degree of automation, high production efficiency,
convenient pattern change, and easy control of product quality. The wide range
of product possibilities is particularly valued by domestic manufacturers. At
present, there are two sets of AC servo systems in the domestic flat knitting
machine industry, which are used to control the head and shaker on the flat
knitting machine. The main servo is used for the machine head drive system, and
the shaker servo is used for the needle bed displacement system.
2. The
simple working principle of computer flat knitting machine system
All knitting-related actions (such as
needle selection, triangle transformation, density adjustment, yarn guide,
needle bed traverse, etc.) are pre-programmed through the computer controller
to each actuator (motor, electronic needle selector, Electromagnets, etc.) send
action signals to drive the relevant mechanisms and machine parts to achieve
the knitting process.
The computerized flat knitting machine
can be divided into 8 parts: main control box, operation panel, creel, flat
knitting machine head, needle bed, shuttle track, drawbar, and underframe.
a. Main control box: including the main circuit
board of the host PC and the drive board of the servo motor, etc. The memory
and control CPU in the control box store the input programs and control the
machine according to the input programs, and process various feedback signals.
It is the core of the control part.
b. Operation panel: including display and
keyboard, used to display control parameters in real-time or used to modify
textile programs and textile data through the keyboard, it is a window for
human-computer interaction.
c. Yarn stand: used for the introduction of yarn.
d. Flat knitting machine head: It is the most
complicated flat knitting machine, including the most control mechanism and the
mechanism that directly controls knitting, which is the heart of the flat
knitting machine. It mainly includes the yarn guide mechanism, triangle
mechanism, textile needle selection mechanism, density control structure, and
signal detection mechanism.
e. Needle bed, the reciprocating motion on the
needle bed of the machine head completes the weaving of the fabric through
needle selection and its lateral movement.
f. Shuttle track: used to guide the yarn guide
and yarn feeder.
g. Pull the lever.
h. Underframe.
3. Zhishan servo parameter setting
Zhishan servo is used on computer flat
knitting machine, including 2 parts: the first part drives the main motor (1kW,
1500RPM) to reciprocate on the bed through the belt drive belt head, the
second part drives the shaker motor (0.75kW, 3000RPM) The belt drives the ball
screw to move the needle plate to check the pattern. At present, the Zhishan
servo system has been successfully used in most domestic flat knitting machine
manufacturers. The following is the Zhishan servo parameter settings.
Parameter setting description
(1) Main bed parameters
Pr000 = 1 (control mode selection, 1:
position control);
Pr003 = 0/1 (motor running direction
setting, which can be used to change the motor direction);
Pr004 = 1 (input command pulse frequency
denominator, electronic gear ratio denominator);
Pr005 = 1 (input command pulse frequency
doubling numerator, electronic gear ratio numerator);
Pr008 = 55 (position loop proportional
coefficient);
Pr010 = 2000 (speed loop proportional coefficient);
Pr011 = 78 (speed loop integral
coefficient);
Pr054 = 9 (Output frequency division);
(2) Shaker parameters
Pr000 = 1 (control mode selection, 1:
position control);
Pr003 = 0/1 (motor running direction
setting, which can be used to change the motor direction);
Pr004 = 1 (input command pulse frequency
denominator, electronic gear ratio denominator);
Pr005 = 10 (input command pulse
frequency doubling numerator, electronic gear ratio numerator);
Pr008 = 55 (position loop proportional
coefficient);
Pr010 = 2000 (speed loop proportional
coefficient);
Pr011 = 78 (speed loop integral
coefficient);
4. Conclusions
The application of Zhishan GD 2 in 1
series servo in the computerized flat knitting machine has proved that the
servo system has the advantages of fast response, accurate positioning, short
setting time, and stable operation. After being used by customers, the knitted
sweaters and other knitted fabrics woven from the mountain servo system used in
the computerized flat knitting machine can meet the requirements, which can
effectively improve the production efficiency.
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