JP2010054393A - Weight measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weight measuring apparatus which enables a user to lift up a comparatively heavy substance to be measured by human power without using a power winch, and measure the weight of the substance easily. <P>SOLUTION: The weight measuring apparatus 10 includes a movable pulley block 13 having a plurality of movable pulleys 31, a fixed pulley block 12 having a plurality of fixed pulleys 21, a rope 15 hooked around the movable pulleys 31 and the pulleys 21, a tension detector 14 for detecting tension generated in the rope 15, and an indicator 45. The indicator 45 includes an arithmetic operation part 51 for calculating the weight of the substance to be measured 11 based on the value of the tension detected by the tension detector 14 while the substance 11 is hung down from the movable pulley block 13, a display part 54 for displaying the calculation results of the operation part 51, and an input part 55 for inputting the number of the movable pulleys 31 which the movable pulley block 13 has. The weight of the substance 11 is calculated based on the number of the movable pulleys 31 and the value of the tension detected by the tension detector 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a weight measuring device that suspends a measurement object and detects its weight.

  2. Description of the Related Art Conventionally, a hanging balance that suspends a measurement object and detects the load is known as a kind of weight measuring apparatus. In this type of weight measuring device, the weight of the measurement object is detected by suspending the measurement object so that the load of the measurement object is directly applied to the spring and detecting the amount of extension of the spring. The rope connected to the measuring body is wound up with a hoisting machine, and the load (current value) applied to the hoisting machine is detected to detect the weight of the measuring object, or the rope that suspends the measuring object is moved A device that detects the weight of an object to be measured by detecting the amount is known (for example, Patent Documents 1 and 2).

  The load detection device described in Patent Document 1 includes a base, a hoisting drum and a rotating member supported by the base, a wire rope spanned between the hoisting drum and the rotating member, a hoisting drum, A moving pulley on which a wire rope between the rotating members is wound (fitted) is provided, and a measured object is suspended from the moving pulley. And in this load detection apparatus, the load of a to-be-measured body is detected with the rotation amount of a rotation member.

Moreover, in the cargo handling apparatus described in Patent Document 2, one end of the hanging wire and one end of the anchor wire are connected to a lever provided to be rotatable, and the hanging wire is attached to a hook sheave in which a measurement object is suspended. And the load of the object to be measured is detected by a three-point roller type load meter provided on the anchor wire. In this cargo handling apparatus, the other end of the anchor wire is fixed to the anchor bracket, and the other end of the hanging load wire is wound around the winch.
Japanese Patent Laid-Open No. 51-40176 JP-A-57-103985

  There is a demand for easily knowing a measure of the weight of the object to be measured using the above-described suspension scale. For example, there is a case where it is not necessary to know the exact weight of planted trees, stones, etc., but the transportation means and price cannot be determined without knowing the approximate weight. However, it is difficult to lift the measurement object manually with a suspension balance having a hook that suspends the measurement object on the balance when the measurement object is a heavy object of about 200 kg. On the other hand, when a winch (power hoist) is used, it becomes possible to lift a heavy object and detect its weight, but the equipment becomes large because it is equipped with a power device such as an electric motor or an engine, Requires energy sources such as electricity and oil. Furthermore, a sensor capable of detecting a load corresponding to a heavy object is required, and the weight measuring device is expensive.

  The present invention has been made to solve the above-described problems, and a relatively heavy object to be measured is lifted manually without using a winch (power hoist) such as a hoist or an overhead crane. It is an object of the present invention to provide a weight measuring device that can easily measure the weight of the lever.

  The weight measuring device of the present invention includes a plurality of moving pulleys, a moving pulley block that suspends a measurement object, a fixed pulley block that includes a plurality of constant pulleys corresponding to the moving pulley, and at least one end thereof being fixed. A rope wound around the movable pulley and the plurality of fixed pulleys, a tension detector for detecting a tension generated in the rope, and the tension detector in a state in which a measured object is suspended from the movable pulley block And an indicator having a calculation unit that calculates the weight of the object to be measured based on the value of the tension generated in the rope detected in step B, and a display unit that displays the calculation result of the calculation unit. .

  According to the weight measuring apparatus having the above-described configuration, the object to be measured can be lifted with a relatively low tensile load (operation load) by pulling the other end of the rope, and can be easily and manually performed without using a power hoist or the like. The weight range of the measurement object that can be measured can be expanded. In addition, since the tension detector can be used for a relatively low load, it can contribute to the downsizing and cost reduction of the weight measuring device.

  In the weight measuring device, the indicator includes an input unit that inputs the number of moving pulleys included in the moving pulley block, and the calculation unit receives an input from the input unit and includes a moving block that the moving pulley block includes. The number of pulleys is acquired, and the weight of the measured object is calculated based on the number of the movable pulleys and the tension value generated in the rope detected by the tension detector. Is good. Thereby, even if the number of moving pulleys is increased or decreased according to the weight of the measured object, the weight value of the measured object can be displayed with the indicator according to the number of moving pulleys.

  Further, in the weight measuring device, the indicator can change the resolution of the weight of the object to be measured displayed on the display unit according to the number of the moving pulleys included in the moving pulley block by the ability of the tension detector. It is preferable to be configured to change within a predetermined maximum resolution. Thereby, according to increase / decrease in the number of movable pulleys, it can adjust automatically so that it may become the resolution suitable for it.

  Further, in the weight measuring device, one end of the rope may be fixed to the weight measuring device side, and the other end of the rope may be configured to be fixed to a measured object or a mounting plate of the measured object. Thereby, stable measurement can be performed.

  The present invention has the following effects.

  ADVANTAGE OF THE INVENTION According to this invention, the weight range of the to-be-measured body which can lift a to-be-measured body with comparatively small tension | pulling operation loads, such as human power, can be expanded with an inexpensive structure. Thereby, in a weight measuring apparatus, it becomes possible to lift up the to-be-measured object of a comparatively heavy thing by human power, and to measure the weight easily.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

(Embodiment 1)
A weight measuring apparatus 10 according to Embodiment 1 of the present invention will be described. 1 is a diagram showing a schematic configuration of a weight measuring device according to an embodiment of the present invention, FIG. 2 is a front view of the weight measuring device, FIG. 3 is a side view of the weight measuring device, and FIG. 4 is a modification of the weight measuring device. 1 is a diagram showing a schematic configuration of FIG. 1, and FIG. 5 is a diagram showing a schematic configuration of Modification 2 of the weight measuring device.

  As shown in FIGS. 1 to 3, the weight measuring device 10 is a measuring instrument that measures the weight of the measured object 11 by combining a pulley and a scale, and is provided below the fixed pulley block 12 and the fixed pulley block 12. The arranged movable pulley block 13, a rope 15 (wire rope) that lifts the measurement object 11 using the pulley, a tension detector 14 that detects the tension generated in the rope 15, and the object measured by the weight measuring device 10. An indicator 45 that displays the weight of the measuring body 11 is provided.

  The weight measuring device 10 is used in a state of being hung from the ceiling 16, and the measured object 11 attached to the movable pulley block 13 is lifted from the floor 17 by pulling the tension operation side end 15 a of the rope 15. The weight (load) is detected in a state in which the measured object 11 is suspended from the movable pulley block 13. Here, the “ceiling 16” refers to a place where the weight measuring device 10 is suspended, and the “floor 17” refers to a place where the measurement object 11 whose weight is to be measured is placed. In the example shown in FIGS. 2 and 3, the weight measuring device 10 is suspended from a substantially portal jig 48 placed on the floor 17.

  The moving pulley block 13 includes n moving pulleys 31. The number n of the movable pulleys 31 included in the movable pulley block 13 is at least plural, and it is preferable to increase or decrease the number as appropriate according to the weight of the measured object 11. In addition, in FIGS. 1-3, the weight measuring apparatus 10 provided with five moving pulleys is illustrated. These n pulleys 31 are rotatably supported by shafts 32 installed on the frame 33 so that the pulleys 13 are configured. The frame 33 of the movable pulley block 13 is provided with a suspended portion 34 for suspending the measured object 11. In the present embodiment, the hanging portion 34 is formed of a hook.

  The fixed pulley block 12 includes the number of fixed pulleys 21 corresponding to the number of the moving pulleys 31 included in the moving pulley block 13. These fixed pulleys 21 are each rotatably supported by a shaft 22 installed on a frame body 23 so that the fixed pulley block 12 is configured. The fixed pulley block 12 is suspended from the ceiling 16 so that the weight measuring device 10 is supported on the ceiling 16.

  A tension detector 14 is attached to the frame body 23 of the fixed pulley block 12. The tension detector 14 is connected to a detection side end 15 b of the rope 15, and the tension detector 14 detects a tension (tensile load) generated in the rope 15.

  The rope 15 having one end (detection side end 15 b) connected to the tension detector 14 is a fixed pulley such as a fixed pulley 21, a moving pulley 31, a fixed pulley 21, a moving pulley 31,. 21 and the movable pulley 31 are alternately wound around. The other end (the tension operation side end 15a) of the rope 15 is a free end in the present embodiment, and a tension operation load is applied in the direction of the black arrow (downward) shown in FIG. .

  In the present embodiment, the tension detector 14 is supported by the frame body 23 of the fixed pulley block 12. However, the tension detector 14 is not limited to this as long as the tensile load applied to the rope 15 can be detected. For example, as shown in FIG. 4, the tension detector 14 is suspended from the ceiling 16, and the detection side end 15 b of the rope 15 connected to the tension detector 14 and a pulley 21 provided on the fixed pulley block 12 are provided. A fixed pulley 49 provided on the floor 17 may be interposed between the wound portion and the wound portion in order to change the direction of the tensile load.

  Further, in the present embodiment, the rope 15 is alternately arranged between the fixed pulley 21 and the movable pulley 31 such as the fixed pulley 21, the moving pulley 31, the fixed pulley 21, the moving pulley 31,. Although it is wound, it is not limited to this. For example, as shown in FIG. 5, the rope 15 having the detection side end 15 b connected to the tension detector 14 has a fixed pulley such as a moving pulley 31, a fixed pulley 21, a moving pulley 31. The pulley 21 and the movable pulley 31 may be wound alternately. In this case, the number of the fixed pulleys 21 can be reduced.

  The indicator 45 is configured to be able to receive a detection signal from the tension detector 14. In the present embodiment, the indicator 45 is arranged at a position where the operator of the jig 48 can easily see, and the indicator 45 and the tension detector 14 are configured to be communicable by wireless communication means (not shown). However, the arrangement of the indicator 45 is not limited to this. For example, the indicator 45 can be carried away from the jig 48, or the indicator 45 can be fixed to the frame body 23 of the fixed pulley block 12. The tension detector 14 and the indicator 45 can be configured to be communicable by wired communication means.

  Here, the configuration of the indicator 45 will be described. FIG. 6 is a block diagram showing a schematic configuration of the indicator. In the figure, the solid line indicates the flow of data (information), and the two-point difference line indicates the flow of the control signal.

  As shown in FIG. 6, the indicator 45 includes an arithmetic unit 51, a storage unit 52 that stores programs, parameters, and the like, a control unit 53 that controls the operation of the indicator 45, and arithmetic operations performed by the arithmetic unit 51. A display unit 54 that displays and outputs the result, an input unit 55 that inputs commands and information to the calculation unit 51, an I / O 56 that receives a detection signal from the tension detector 14 via the A / D converter 46, and the like And.

  The calculation unit 51 executes a program stored in the storage unit 52, receives the detection signal from the tension detector 14, and calculates the weight of the measured object 11. In the calculation unit 51, the tare subtraction calculation, the zero point correction, and the like are performed by a general method as in the conventional weight measuring apparatus.

  Input of parameters to the calculation unit 51 is performed by the input unit 55. One such parameter is the number n of moving pulleys 31 provided in the weight measuring device 10. The number n of the movable pulleys 31 input to the indicator 45 is stored in the storage unit 52 and used for calculation for calculating the weight of the measured object 11. The calculation unit 51 determines the “pulley coefficient N” according to the number n of the movable pulleys 31. Here, “pulley coefficient N” refers to a coefficient defined by [pulley coefficient N = ½n (Expression 1)]. Then, the calculation unit 51 uses the relationship [the detected weight of the measured object 11 = the detected tensile load F / the pulley coefficient N (Equation 2)] to calculate the weight of the measured object 11. calculate. Needless to say, zero point correction and taring are further added to (Expression 2).

  Next, the flow of measuring the weight of the measurement object 11 using the weight measuring device 10 having the above configuration will be described.

  First, the power of the indicator 45 is turned on, and the number n of the movable pulleys 31 is input via the input unit 55. The number n of the movable pulleys 31 can be stored in advance in the storage unit 52 as an initial value. Thus, since the number of the moving pulleys 31 can be arbitrarily input in the weight measuring device 10, even if the number of the moving pulleys 31 is increased or decreased according to the weight of the measured object 11, the number of the moving pulleys 31 is increased. Accordingly, the weight value of the measurement object 11 can be displayed on the indicator 45.

  Subsequently, zero point correction of the weight measuring device 10 is performed. That is, the indicator 45 acquires the detection value of the tension detector 14 in a state where there is no load by the measured object 11 (no load state), and corrects the zero point based on the acquired detection value. Further, when a container or the like is required to suspend the measurement object 11 on the suspended portion 34, a tare such as a container is attached to the suspended portion 34 of the weight measuring device 10 and the tare is lifted (away from the floor 17. In this state, the detection value of the tension detector 14 is acquired, and taring is performed based on the acquired detection value.

  As described above, after performing preparations such as zero point correction and taring, the measured object 11 is attached to the suspended portion 34 of the weight measuring apparatus 10. Then, the operator gently pulls the tension operation side end 15 a of the rope 15 until the measured object 11 is separated from the floor 17 and lifts the measured object 11. The operator may hold the tension operation side end 15a of the rope 15 as it is, or the tension operation side end 15a may be locked to, for example, a jig 48 or the like. As described above, in the weight measuring device 10, by providing the plurality of movable pulleys 31, the measurement object 11 can be lifted with a relatively low tensile load (operation load) without using a power hoist or the like. Measurements can be easily performed manually. In addition, since the tension detector can be used for a relatively low load, it can contribute to the downsizing and cost reduction of the weight measuring device.

  In the present embodiment, a tension operation load is applied to the tension operation side end 15a of the rope 15 by the operator's human power, but a power hoist such as a winch is connected to the tension operation side end 15a. However, this power hoist can also be configured to apply a tensile operation load to the rope 15. Also in this case, since a plurality of movable pulleys 31 are provided in the weight measuring device 10, the tensile operation load is reduced, so that a power hoisting machine having a relatively small output can be adopted, and a small size This can contribute to reduction in cost and cost.

  As described above, the measurement of the measurement object 11 is started in a state where the movement of the measurement object 11 suspended from the weight measurement device 10 is stopped. A detection signal corresponding to the tension (tensile load) generated on the rope 15 is transmitted from the tension detector 14 to the indicator 45. Upon receiving this detection signal, the calculation unit 51 of the indicator 45 calculates the weight of the measured object 11 using the above-described (Equation 2), creates information for displaying the calculation result, and displays the display unit. To 54. Thereby, the weight of the measurement object 11 is displayed on the display unit 54.

  In the weight measuring device 10 having the above configuration, if the number of the movable pulleys 31 and the corresponding constant pulleys 21 are increased, the weight range of the measurable body 11 to be measured is greatly increased and the error due to friction is also increased. The resolution decreases. Further, since the weight measuring device 10 is used as a reference scale that performs measurement while ignoring an increase in frictional force accompanying an increase in pulleys, a high degree of resolution may not be necessary. Therefore, the weight resolution (display resolution) of the measured object 11 displayed on the display unit 54 of the indicator 45 is changed in accordance with the value of the pulley coefficient N or by an arbitrary switching command. You can also.

  For example, when the resolution (maximum resolution) based on the ability of the tension detector 14 is 0.01 kgf, the resolution when the number n of the moving pulleys 31 is less than 5 is 0.01 kgf, and the number of the moving pulleys 31 is The calculation unit is set in advance so that the resolution when the number n is 5 or more and less than 50 is 0.1 kgf, and the resolution when the number n of the moving pulleys 31 is 50 or more is 1 kgf. 51 can be configured to perform calculation by appropriately changing the display resolution within the range of the maximum resolution or less according to the value of the number n of the movable pulleys 31 input to the indicator 45. In such an indicator 45, according to the increase / decrease in the number of the movable pulleys 31, it will adjust automatically so that it may become the display resolution suitable for it.

  Also, for example, when a display resolution switching command is input to the indicator 45 via the input unit 55 of the indicator 45, the calculation unit 51 receives the display resolution switching command and performs measurement at the indicated display resolution. The calculation can be performed to display the weight of the body 11.

(Embodiment 2)
A weight measuring apparatus 10 according to Embodiment 2 of the present invention will be described. FIG. 7 is a diagram showing a schematic configuration of a weight measuring apparatus according to Embodiment 2 of the present invention.

  As shown in FIG. 7, the weight measuring device 10 according to the second embodiment has the weight measuring device 10 according to the first embodiment and the tension operation side end 15 a fixed to the measured object 11 side. Except for the point, it has the same apparatus configuration. Therefore, with respect to the weight measuring device 10 according to the second embodiment, a detailed description of portions common to the weight measuring device 10 according to the first embodiment is omitted.

  The detection side end 15b of the rope 15 provided in the weight measuring device 10 is fixed to the weight measuring device 10 side. In the present embodiment, the detection side end 15b of the rope 15 is connected to and fixed to the tension detector 14. On the other hand, the tension operation side end 15a of the rope 15 is configured to be fixed to the measured object 11 side. In the present embodiment, a placing plate 19 on which the measured object 11 is placed is connected to the hanging portion 34, and the tension operation side end portion 15 a of the rope 15 can be fixed to the placing plate 19. It is desirable that the fixing portion between the loading plate 19 and the tension operation side end 15a of the rope 15 is configured by a hook or the like so that the tension operation side end 15a of the rope 15 can be easily detached from the loading plate 19. . However, the suspension part 34 and the tension operation side end 15a of the rope 15 may be directly connected and fixed to the measurement object 11.

  As described above, by fixing the tension operation side end 15a of the rope 15 to the measured object 11 side, compared to the case where the tension operation side end 15a is pulled and held by human power, The run-out tends to subside and stable measurement can be performed.

  In this embodiment, the “pulley coefficient N” is defined by [pulley coefficient N = 1 / (2n + 1) (Expression 3)]. Then, when measuring the weight of the measured object 11, the calculation unit 51 of the indicator 45 determines “pulley coefficient N” based on (Expression 3) according to the number n of the movable pulleys 31 input to the indicator 45. Further, the weight of the measured object 11 is calculated based on the pulley coefficient N and the above-described (Equation 2).

  In the weight measuring device 10, when measuring the weight of the measured object 11, the tension operation side end 15 a of the rope 15 is fixed to the measured object 11 (Embodiment 2), or the operator or It can also be configured so that the operator can arbitrarily select whether to hold the jig 48 (Embodiment 1). In this case, when a switching command between the former and the latter is input to the indicator 45 via the input unit 55, the indicator 45 that has received this switching command sets the pulley coefficient N in accordance with the contents of the switching command. It is configured to determine which pulley coefficient calculation formula (Equation 1) or (Equation 3) is used for calculation, and to calculate the weight of the measured object 11 using the selected pulley coefficient calculation formula. .

  The present invention can be widely applied to a weight measuring apparatus in which a measured object is lifted and its weight is measured regardless of the detailed structure such as the arrangement of a moving pulley or a fixed pulley.

It is a figure which shows schematic structure of the weight measuring apparatus which concerns on Embodiment 1 of this invention. It is a front view of a weight measuring apparatus. It is a side view of a weight measuring apparatus. It is a figure which shows schematic structure of the modification 1 of a weight measuring apparatus. It is a figure which shows schematic structure of the modification 2 of a weight measuring apparatus. It is a block diagram which shows schematic structure of an indicator. It is a figure which shows schematic structure of the weight measuring apparatus which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Weight measuring apparatus 11 Measured object 12 Constant pulley block 13 Dynamic pulley block 14 Tension detector 15 Rope 16 Ceiling 17 Floor 21 Fixed pulley 22 Axis 23 Frame body 31 Dynamic pulley 32 Axis 33 Frame body 34 Suspension 45 Indicator 51 Calculation Unit 52 Storage unit 53 Control unit 54 Display unit 55 Input unit

Claims (4)

A moving pulley block having a plurality of moving pulleys and hanging the object to be measured;
A fixed pulley block having a plurality of fixed pulleys corresponding to the movable pulley;
Ropes having at least one end fixed and wound around the plurality of movable pulleys and the plurality of fixed pulleys;
A tension detector for detecting the tension generated in the rope;
A calculation unit for calculating a weight of the measured object based on a tension value generated in the rope detected by the tension detector in a state where the measured object is suspended from the movable pulley block; and An indicator having a display unit for displaying a calculation result;
A weight measuring device. The indicator includes an input unit for inputting the number of movable pulleys included in the movable pulley block,
The calculation unit receives the input from the input unit, obtains the number of the moving pulleys included in the moving pulley block, and the value of the tension generated in the rope detected by the number of the moving pulleys and the tension detector. And is configured to calculate the weight of the object to be measured,
The weight measuring device according to claim 1. The indicator changes the resolution of the weight of the measured object displayed on the display unit below the maximum resolution determined by the ability of the tension detector according to the number of the moving pulleys included in the moving pulley block. Configured to,
The weight measuring device according to claim 2. One end of the rope is fixed to the weight measuring device side, and the other end of the rope can be fixed to a measurement object or a plate of the measurement object.
The weight measuring apparatus as described in any one of Claims 1-3.

Images