JPS5973770A - Method for measuring average high moving speed of moving object - Google Patents

Abstract

PURPOSE:To calculate an average speed only for a high speed period, by calculating the time and the moving distance during a period wherein a moving speed exceeds the predetermined value in the high speed period and moving accerelation is smaller than a prescribed value. CONSTITUTION:A magnetic scale 5 is also moved corresponding to the movement of a piston 2 and a magnetic head MH generates a scale pulse Ps while an accerelation signal Sa corresponding to the accerelation of a magnetic scale 5 is generated from an accerelation sensor AS. The speed signal V from a speed operator SOP is compared with the predetermined value Vs from a speed setting device SST in a comparator CP1 and the accerelation signal Sa comes to a signal for showing accerelation alpha which is, in turn, compared by a comparator CP2 with the prescribed value alphas from an accerelation setting device AST while the output of an AND gate G comes to ''H'' under a condition of V>Vs and ¦alpha¦<alphas. The output of a counter CT1 shows a time and the output of a counter CT2 shows a moving distance. In an operator OP, the operation of moving distance/time is performed while the average high moving speed of the magnetic scale 5 to be displayed by a display device DP.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method of measuring the average high speed of movement of an object, such as a piston of an injection molding machine, which moves at low and high speeds of movement.

The piston, etc. of an injection molding machine moves at a low moving speed (hereinafter referred to as "low speed") and a high moving speed (hereinafter referred to as "high speed"), as shown in Figure 1, which shows the relationship between stroke S and speed *v. In particular, there is a need to measure average speeds during high-speed periods.

Conventionally, as a countermeasure against this problem, a strip cutter appropriately sets an arbitrary stroke position fil S i on the side of the start point of this period in the high speed period and an arbitrary stroke position s2 on the side of the deceleration start point, and The average speed between the stroke position S1 and S2 is fixed at 11111.

However, in practice, the rate of change in the speed V changes with each injection operation, and setting the stroke Q [St, St fixedly has the disadvantage that it is not possible to accurately measure the average speed. In addition, when changing the switching position from low speed to high speed, the stroke position S1,
The setting of S2 also has to be changed, resulting in a disadvantage that handling is troublesome.

Furthermore, according to the means disclosed in JP-A-54-46586, the above-mentioned drawbacks do not occur, but the O movement is pulsed between the low speed to high speed switching position S3 and the stroke end position S4. Since it is converted into a cycle, it also includes a rising portion from low speed to high speed and a falling portion from high speed to deceleration, resulting in the drawback that the average speed of only the high speed period cannot be determined.

The present invention has been made in view of the drawbacks of the conventional art. The first object of the present invention is to provide a method for measuring the average high-speed moving speed of a moving object, which calculates the time during which the object moves, calculates the distance traveled by the object during this period, and measures the average high-speed moving speed of the object based on these. It is.

In addition, the time period during which the moving speed of the object mentioned above exceeds a predetermined value in the high-speed period and the change in speed of the object is smaller than the predetermined value is determined, and the distance traveled by the object during this period is determined. Measure the average high-speed movement of the object based on the average high-speed movement of the moving object Bi
A second object of the present invention is to provide a speed measuring method.

FIG. 2 is a diagram showing the principle of the first invention, where the prisoner is at time t.
′! The graph shows the change characteristics of the speed V with respect to the stroke ``J-ri 5 (1)'', and (B) shows the change characteristics of the speed V with respect to the stroke S.
It shows the change characteristics of the acceleration α with respect to the IL shift of
As is clear from the figure, if we find the time th during which the velocity V exceeds the predetermined value v8 in the high-speed region and the acceleration α is smaller than the specified clay α8, and also find the distance Wb of the movement of the object during this period, we can calculate these values. The average high-speed moving speed of an object can be measured more accurately based on .

FIG. 3 is a block diagram showing an embodiment of the first invention based on the above principle, in which the rod 3 of the piston 2, which moves inside the cylinder 1 by being Q-driven by hydraulic pressure or the like, is magnetically connected to the rod 3 of the piston 2 by means of a connecting member 4. The scale 5 is connected so that as the piston 2 moves, the magnetic scale 5 also moves linearly.

Further, a magnetic head is provided facing the magnetic scale 5, and a scale pulse Ps is generated in accordance with the movement of the 6-ki scale 5.
On the other hand, a commercially available acceleration sensor 'vAS is fixed to the magnetic scale 5.
From this, an acceleration signal Sa corresponding to the acceleration generated when the magnetic scale 5 moves is generated.

The scale pulse Ps is given to the speed generator SOP, in which the interval Ts of the scale pulse P8 is counted based on the pulse generator PG or Rano clock Hals CLKK, and the reciprocal of this is calculated. A calculation of multiplying by a coefficient is performed, and a signal indicating the moving speed V of the magnetic scale 5 is sent from the speed calculator SOP.

A signal indicating the speed V is applied to one input of the comparator CPI, and is compared with a predetermined value v8 from a speed setter SST such as a potentiometer applied to the other input, and the condition of v>'V8 is satisfied. When , comparator CP
+ produces a comparison output of 'H' (high level), which is supplied to one input of the AND gate Ga.

On the other hand, the acceleration signal Sa from the acceleration sensor As is amplified by the amplifier A to become a signal indicating the acceleration α, which is applied to one input of the comparator CP2, and the acceleration of the potentiometer etc. applied to the other input. Setting device AS
It is compared with the specified value α8 from T, and when the condition of 1α1<α8 is reached, the comparator CP2 generates a comparison output of −11″, which is applied to the other input of the AND game (GR). .

Therefore, in a case where the speed V exceeds the predetermined value v8 and the acceleration 1α1 is smaller than the predetermined value αS, the AND
The output of the gate Ga becomes -H", and by applying this output to the gate terminal G of the counter CT1.Cr2, A
The output of ND gate Ga! Counter CT only during the period of H''
+, Cr2 performs counting operation, counter CTl
By counting the clock pulse CLK applied to the clock terminal CL, the output of the AND gate Ga generates a count output corresponding to the period of ◆I('', while the counter CT2 outputs a count output to the clock terminal CT. By counting the applied scale pulses Ps, a count output is generated according to the moving distance of the magnetic scale 5 during the period of the output force C%HI+ of Kanogame)Ga.

Therefore, the count output of the counter CT1 is the time Th
9, and the count output of the counter CT2 indicates the distance traveled, and these count outputs are given to the arithmetic unit OP constituted by a divider or microprocessor, etc. ,Moving distance/
The time is calculated and the average high-speed movement speed of the magnetic scale 5 is determined, and an output corresponding to the calculation result is given to the display DP using a numerical display or the like, and the average high-speed movement speed is calculated. The measured value will be displayed.

Next, the principle of the second invention will be explained using FIG. 2 again.

In other words, the horizontal axis in Figures 2 (G) and (B) is the stroke S.
If the vertical axis of a3) is the velocity change dV, then the stroke pulse P8 is generated according to the stroke S, so the movement of the object and the axial velocity V can be determined from the generation cycle Ts of the stroke pulse Ps, and the front When the speed of vo is v
The speed change ΔV is obtained from p, -v, and the relationship between the stroke S and the shading dv is shown in 03). It becomes

Therefore, the speed V exceeds the predetermined value v8, and the change 1Δv1 is the specified value 1avSl! If J is also found to be the time th of a small period and the distance traveled by the object during this period, the average high-speed moving speed of the object can be found based on these, as in the first example.

FIG. 4 is a block diagram showing an embodiment of the second invention based on the above principle, in which a stroke pulse Ps generated from the magnetic head MH similar to that in FIG. 3 is applied to the gate terminal G of the counter CTII. At the same time, a clock pulse CLK is given to the clock terminal CL of this, and the clock pulse CLK is applied every stroke pulse Ps (D'H" period).
LK is counted, and a count output is sequentially generated according to the moving speed of the magnetic scale 5, and this is provided to the microcomputer MCP.

Further, a counter CTl2 and a counter CTCs are provided, and their gate terminals G are given a gate signal SG from the microcomputer MCP, and the gate signal SG performs a counting operation only during the period IIP'. counts the clock pulse CLK applied to the clock terminal CL, generates a count output according to the time period of the gate signal Sc 'If', and supplies this to the microcomputer MCP, while the counter CTr s: The stroke pulses Ps applied to the clock terminal CL are counted, and the gate signal Sa generates a count output corresponding to the moving distance of the magnetic scale 5 during the period of ``Hayabusa II'', which is applied to the microcomputer MCP. There is.

Note that the microcomputer MCP has a counter CT+
Based on the count output of l, calculate the reciprocal of this and multiply it by a predetermined coefficient to calculate the moving speed V of the magnetic scale 5, and according to this result, send out the gate signal SG, Counter CT12.

After calculating the average high-speed movement speed of the magnetic scale 5 based on the count output of the CT 15, the result is sent to a display DP such as a numerical display, thereby displaying the fixed value of υill.

%"y 5 Figure IL shows the operation status of the microcomputer MCP) jJ-chart, the counter CT is activated by 1 initial rise" which forces the initial threading.
o ” After ladle CT13's clear etc., 'V.

4-y'', the current speed V is changed to the previous speed v(1
The counter IC is stored in a specific area of memory as
Read the contents of 'l'll and calculate V, current ≧IX
Determine whether the degree V exceeds n'i > i x ii v B or not. “After determining, YES to this
According to 'lvo vl<ΔvB'? ”, the difference between the previous speed v6 and the current speed V, that is, the change ΔV
is determined, and it is determined whether this is smaller than the specified value Δvs.

Also, in response to YES of 'lvo vl<Δv, 7++, it is checked whether the siggate signal SG is only H'' or not. I II II gate signal S
Let a be SKI” and set the counter (: IIp, 2. (, I
Let T, 3 be in the operating state, 1v) vB? '' or 'lvo-v l (CF87'' is N.

Repeat the above operations until .

On the other hand, 'v>vB? "or '1vo-vKΔvs?"
If the result is NO, then call S, -@HII? Check whether gate No. 46 Sc is still %H" by II,
In response to YES, the gate signal Sa is set to %L'' (low level) and the counter CTl2 is set to %SG=L''.
, CI"lS" is stopped, the contents of the counters CT, , , c'i"t3 are read and the average high-speed moving speed is computed to determine the average high-speed moving speed.

Therefore, the moving speed V of the magnetic scale 5 is set to the predetermined value v8.
The counter CTL2 calculates the time Th during which the speed exceeds the specified value JV and the speed change ΔV is smaller than the specified value JV.The counter CT13 calculates the travel distance during this period, and then calculates the travel distance/time. Measurements of average high speed travel are made.

Further, according to the present invention, the speed period is automatically determined, and the time and g motion distance of this period are accurately determined, the speed change characteristics are changed, and the switching from low speed to high speed is changed.4. Even with J, there is no need to change the setting status, etc. 9, and accurate measurement of the average high-speed moving speed is always performed reliably.

The speed calculator SOP in Figure 3, the comparators CPt and C
F2, each setting device SST, AST and AND gate Ga
The function of # may be replaced with a microcomputer, etc.
Various modifications can be made to the present invention, such as replacing the functions of the MS5 diagram with a configuration similar to that of FIG. 3.

As is clear from the above description, according to the present invention, the average high-speed moving speed can be automatically and accurately measured. Effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the conventional 611] determination method, Fig. 2 is a diagram showing the principle of the present invention, Fig. 31 is a block diagram showing an embodiment of the first invention, and Fig. 4 is a diagram showing the embodiment of the second invention. FIG. 5 is a block diagram showing an example of the present invention, and FIG. 5 is a flowchart showing the operating status of the microcomputer in FIG. 1... Cylinder, 2... Piston, 5... e...
Magnetic scale, MH...Magnetic head, As...ψ.
Acceleration sensor, sop @-...speed calculator, ss'r
...Fist speed setting device, AST ...Fist/acceleration setting device, CPl, CPII ...Comparator, PG...
・Pulse generator, Ga/Φ/AND gate, CTI
, CTz , CTu~ CTts ・ ・ ・
- Counter, OP... Arithmetic unit, MCP - Φ microcomputer. Patent Applicant Ube Industries Co., Ltd. Agent Masaki Yamakawa (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 1 Yuki Tsle- Figure 4 Figure 5

Claims (2)

[Claims] (1) Move 1f5 by slow movement speed and high movement speed
1) find the time period during which the moving speed of the object exceeds a predetermined value in the high-speed moving speed and the moving acceleration of the object is smaller than the specified value, and determine the distance traveled by the object during the period; % to measure the average fast moving speed of said object based on time and distance traveled
As a sign, the force method measures the average fast moving speed of an object. (2) Find the time during which the moving speed of an object moving at a low moving speed and a high moving speed exceeds a predetermined value at the high moving speed, and the change in speed of the object is smaller than a specified value, and A method for measuring an average high-speed moving speed of a moving object, the method comprising determining the moving distance of the moving object during the period and measuring the average high-speed moving speed of the object based on the period and the moving distance.