JPS62159021A - Driving torque detecting method - Google Patents

Abstract

PURPOSE:To realize a method capable of measuring the driving torque of a loading shaft accurately with good operational efficiency by providing two contacts to a wire member interlocking with the loading shaft of an object to be measured and measuring a difference between the quantities of displacement. CONSTITUTION:The wire member 4 is strained between a driving shaft 2 rotated by a power source and the loading shaft 3 of the object to be measured. Then, a guide roller group 5a-5d are provided rotatably to a device fixing part 1. Further, the contacts 6a and 6b of the upper side and the lower side which come into contact with the member 4 so as top hold it between from the vertical direction are provided rotatably at a prescribed interval on the subtraction base 74 constituting an input member of a displacement quantity detector 7. Then, tension components F1 and F2 of the contacts 6a and 6b generating from the tension of the member 4 are made amplified and an angle between the contacts 6a and 6b and respective parts 4a-4d of the member 4 is set to make the small acute angle. In this way, the contacts 6a and 6b are displaced respectively by the tension force of the member 4 generating on the facing parts and the difference between the respective quantities of displacement is detected and the driving torque of the loading shaft 3 is measured.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is applicable to the precision technology field such as copying machines, the automobile industry field such as automobiles and motorcycles, the spinning technology field such as twisted yarns and textiles, and the field of paper, tape, film, etc. Widely used for purposes such as tension detection, trouble detection, and application to automatic intake systems in various industrial fields that handle continuous long linear or strip materials (hereinafter simply referred to as wire members), such as technical fields. The present invention relates to a driving torque detection method.

[Technical Background of the Invention and Problems Thereof 1 Various methods have been conventionally known for detecting the driving torque of a rotating shaft. For example, a method is generally used to detect torque by twisting a thin measuring rod and measuring the amount of twist, but this method has material and engineering limitations on the thickness of the measuring rod. Moreover, there are problems in that a movable contact mechanism such as a slip ring is required to extract the detection signal, and the accuracy is not suitable for performing precise measurements. Therefore, there has been a strong desire for a new drive torque detection method that allows precise measurement and has good operating efficiency.

[Object of the Invention] The present invention has been made in view of this situation, and includes two contacts provided on a linear member interlocked with the load shaft to be measured, and a difference in displacement between the two contacts. The purpose of this invention is to provide a new method for detecting driving torque by measuring the measured value and using it as the basis for detecting driving torque.

[Summary of the Invention] The outline of the present invention for achieving the above-mentioned object is to connect contactors that respectively contact two opposing portions of a linear member folded back across the load axis of the measurement object, to two opposing portions. Displaced by the tension force of the linear member generated in the part,
The present invention resides in that the drive torque related to the load shaft is measured by detecting the amount of displacement of both liquid contactors at the time of the displacement.

[Embodiments of the invention] Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In Fig. 1, ] is the fixed part of the drive torque inspection device, 2
3 is a drive shaft rotated in the direction of the arrow by an appropriate power source, 3 is a load shaft, and 4 is a linear member stretched between the drive shaft 2 and the load shaft 3.

5a to 5d are a group of guide rollers rotatably provided on the device fixing part 1; 6a and 6b are upper and lower contactors that come into contact with the linear member 4 in a sandwiching manner from above and below in the figure; For example, it is rotatably provided at a predetermined interval on a subtraction base 74 that constitutes an input member of a dynamic displacement detector 7 such as a load cell.

This interval is set between the liquid contactors 6a and 6b and their left and right parts so that the tension components F1 and F2 of the liquid contactors 6a and 6b generated due to the tension of the filament member 4 can be amplified. Each part of the linear member located 4a, 4b, 4C, 4
The angles θ1, θ2, θ−1, and θ′2 formed between the
These angles θ1, θ2, θ'1, and θ-2 can all take arbitrary values at the time of design.

As shown in FIG. 2, the displacement detector 7 described above basically includes a detector body 71, a base 72, and a pair of support plates 73.
73-1 Subtraction base 74 and a pair of magnetic senrifs 5 and 7
Consists of 5-.

That is, as shown in the figure, the base 72 fixed to the detector main body 71 has two levels of flat parts 72 in both the upper and lower parts perpendicular to the plane of the paper.
a, 72b, 72a--72b-, and the upper and lower flat parts? Support plates 73 and 73' at 2a and 72a'
to be held fixedly.

The pair of support plates 73 and 73- are each made of a metal elastic body such as a steel plate or a beryllium copper plate;
Depending on the case, this may be configured such that each support plate has a plurality of thin support plates arranged in parallel.

The subtraction base 74 has an upper and lower flat portion 74a formed at the left end.
- 74a' is firmly fixed to the support plates 73 and 73', so that the base 74 is supported in a cantilever manner with respect to the detector main body 71. Therefore,
When an external force is applied in the vertical direction in the figure to the contacts 6a and 6b provided on the base 74, the subtraction base 7
Due to the bending action of the pair of support plates 73 and 73-, the detector 4 moves linearly in parallel in the vertical direction with respect to the detector main body 71 within a minute range thereof.

The pair of magnetic sensors 75 and 75' are connected to the pair of support plates 7.
3 and 73- in the vertical direction as a magnetic change, and the support plates 73 and 73 are placed on each of the intermediate stage flat portions 72b and 72b- of the base 72.
It is provided so as to face the inner surface of - with a slight gap C in between. The detection outputs of the magnetic sensors 75 and 75' are introduced in advance into an arithmetic circuit (not shown), where they are synthetically calculated and converted into an accurate amount of vertical displacement of the subtraction base 74. It shall be configured by appropriate means.

Note that instead of the magnetic sensors 75 and 75', for example, a piezo electrode element or a strain gauge element 77 is connected to a pair of support plates 7.
3 and 73', so that when a slight deflection occurs in each support plate, the amount of deflection is extracted as an electrical signal, and these are calculated synthetically.

The operation of the drive torque detection device configured in this way will be explained below.

Generally, the driving torque T related to the load shaft is T= (t2-
tt)R・・・・・・・・・・・・・・・・・・(1
) [However, t2>tt] Note) t2... Tension acting on the running side (lower side in the figure) of the filament member 4.

tl...Running side of the filament member 4 (upper side in the figure)
Tension acting on a part.

R: Radius value of the load shaft (constant depending on installation conditions).

It is expressed as

This shows that it is possible to determine the driving torque by knowing the value of (t2-tl), but since the tensions t2 and tl are originally internal stresses of the filament member 4, they can be used as they are. It cannot be measured by shape.

As shown in the first figure, the linear members 4 are bent (
(The figure shows an example of inward bending) and when the contacts 6a and 6b are brought into pressure contact at that position, upward and downward tension components F1 and F2 are applied to these contacts 6a and 6b. It turns out. These two component forces F1 and F2 are respectively F1=tt cosθ1 +tl CO2O3...
...(2) F2 = t2 CO3θ-1+t2 CO3θ-2...
・・・・・・・・・(3) Note) θ1...Angle formed between the upward component force F1 and the left side portion 4a of the contactor 6a in the filament member 4.

θ2...The angle formed by the upward component force F1 and the right side portion 4b of the contactor 6a in the filament member 4.

θ-1: Angle formed by the downward component force F2 and the left side portion 4C of the contactor 6b in the filament member 4.

θ-2...Angle formed by the downward component force F2 and the right side portion 4d of the contactor 6b in the filament member 4.

Therefore, if the positions of the contactors 6a and 6b are determined so as to satisfy the condition θ1-02=θ-1=θ'2=θ, then the above (2) regarding [1 and F2]・For both formulas (3), Fl = t12CO3θ ・・・・・・・・・・・・・
...(4) F2 = t22'CO5θ ...
It can be modified as (5). In this case, the component forces of equations (4) and (5) applied to the contacts 6a and 6b act in opposite directions, so the force F acting to displace the subtraction base 74 is F=F2 -Fl is the resultant force, and this is F=20O8θ(t2-tl) (6)
It can be expressed as

This means that the subtraction value of rt2-ttJ with "2CO8θ" as a coefficient is applied downward to the subtraction base 74, so that the subtraction base 74 is applied to the support plate 73 by an amount corresponding to the force F.・It will overcome the rigidity of 73' and be displaced downward. Therefore, this displacement is supported by the plate 7.
If it is detected as a 3.73- bent silver, and after performing a prescribed conversion in an arithmetic circuit, it is substituted into the above formula (1),
The target driving torque T can be determined.

That is, the objective is achieved by detecting the composite displacement sacrifice of the upward tension component F1 and the downward tension component 1:2.

Although one embodiment has been described above, the present invention is not limited thereto, and can be implemented in various ways without departing from the spirit thereof. For example, the stretched form of the filament member 4 and the installation positions of the two contacts 6a and 6b related thereto are such that the drive shaft 2 is connected to the delivery shaft 8 and the winding shaft 2', as shown in the third figure. It may be a separate type, or it may be configured such that the tension components F1 and F2 acting on the intervening contacts 6a and 6b are directed toward the load shaft 3, as shown in the fourth figure.

Furthermore, regarding the configuration of the displacement amount detector 7, in the embodiment shown in the first figure, the inter-contact members 6a and 6b are provided on a common subtraction base 74, and the component forces E1 and F2 related to the inter-contact members are 1.
However, the contactors 6a and 6b are each provided on separate displacement amount detectors (not shown), so that the amount of displacement associated with each can be detected separately. Alternatively, the two detected values may be introduced into an appropriate arithmetic circuit and subtracted, and the resultant force F may be obtained from this.

In the illustrated embodiment, one support plate has the function of holding the subtraction base on which the contact is placed in the air and the guiding function of determining the direction of displacement of the subtraction base. The functions may be separated and the holding function and the guiding function may be entrusted to two separate @ structures. In addition, not only can an appropriate means be used for measuring the amount of displacement in addition to the illustrated embodiment, but also the structure of the contact can be fixedly installed on the subtraction base if it is made of a material with a small coefficient of friction. You may.

[Effects of the Invention] As described above, when the present invention is used, it is possible to accurately detect the driving torque in equipment used in various technical fields, so it can be said that the effects are extremely large.

[Brief explanation of drawings]

Fig. 1 is a main explanatory diagram showing one embodiment of the present invention, Fig. 2 is a schematic mechanical diagram when two contacts are held by one support member, and Figs. It is an explanatory view showing an example.

Claims (4)

[Claims] (1) The contacts that contact two opposing parts of the linear member folded back across the load axis to be measured are respectively displaced by the tension force of the linear member generated in these opposing parts. . A drive torque detection method, characterized in that the drive torque related to the load shaft is measured by detecting the difference in the amount of displacement of both contacts at the time of the displacement. (2) Driving torque detection according to claim 1, wherein the two contacts are fixed on a common support member, and the difference in the amount of displacement is detected as the amount of displacement of the support member. Method. (3) A patent in which the two contacts are each fixed on two support members that are movable relative to each other, and the difference in the amount of displacement is detected as the difference in the amount of displacement between these two support members. A driving torque detection method according to claim 1. (4) The tension force between the two opposing parts of the filament member is
The driving torque detection method according to any one of claims 1 to 3, wherein the driving torque is amplified by the presence of two fixed rollers installed across the load shaft.