JP2008111691A - Vehicle weight measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that, in a previous vehicle measuring apparatus, depending on the vehicles, it is difficult to see from an operator room whether all wheels (4 wheels) are on a weighing stand correctly or not and a measuring with even one wheel come off can cause erroneous measurement. <P>SOLUTION: A vehicle weight measuring apparatus is provided with a rectangular weighing stand 11 having an area capable of placing every wheel 22-25 of a weighing object vehicle 2 and a load detecting device 12 provided on the weighing stand 11. When the vehicle weight is measured, it is easily possible to determine whether the vehicle 2 is at the correct position or not by providing a vehicle position confirming means 3-5 confirming whether all wheels 22-25 of the vehicle 2 are at the correct position or not. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle weight measuring device called a truck scale.

  This type of vehicle weight measuring device (track scale) measures the total weight of a vehicle in a loaded state, and includes a rectangular weighing platform having an area on which all wheels of a vehicle can be placed, and each weighing platform. It has four load detectors (load cells) provided near the corners. Incidentally, this type of vehicle weight measuring device (track scale) has been put into practical use for a long time, and many patent applications have been filed (for example, Patent Document 1, Patent Document 2, etc.).

  In this type of vehicle weight measuring device, the loaded vehicle is placed on the weighing platform, and the total weight of the vehicle at that time is calculated by the calculation device of the controller based on the detection data from each load detector. It has become. Note that the actual load amount is calculated by subtracting the unloaded vehicle weight from the loaded vehicle total weight.

  Weighing values weighed with this type of vehicle weight measuring device can only be used as transaction proofs when weighed vehicles are stopped on the weighing platform, but at the time of weighing, all of the weighed vehicles are used. All the wheels need to be placed in a stationary state at a normal position on the weighing platform. In addition, as a vehicle to be weighed, there are a total of 6 wheels with an intermediate axle provided between the front and rear axles, but in general there are also 4 wheels on the front and rear, left and right (each using a double tire for each rear wheel). However, this is also described as one wheel each), and in the following description, all wheels are assumed to be four.

  By the way, the vehicle to be weighed enters the weighing platform from one side in the longitudinal direction of the weighing platform, but the wheels are not visible from the driver's seat of the vehicle, and all the wheels are placed at normal positions on the weighing platform. It is not possible to confirm whether it is placed. Therefore, sometimes the vehicle stops with the rear wheel not yet resting on the inlet end of the weighing platform, or the front wheel stops beyond the outlet end of the weighing platform, or one of the wheels Sometimes it sticks out and stops.

  On the other hand, the operator in the operator room needs to check whether or not the vehicle to be weighed is in a normal position on the weighing platform at the time of weighing. It may be difficult to confirm whether or not the rear wheel) is placed at a normal position on the weighing platform.

  When the vehicle to be weighed is stopped in a state where some of the wheels protrude from the weighing table (derailed from the weighing table), accurate weighing cannot be performed.

  In addition, some weighing platforms have a considerable length (for example, about 8 m) so that large vehicles (the distance between the front and rear wheels are long) can be measured. In the case of a vehicle equipped with a platform, it is conceivable that the front wheel of the succeeding vehicle rides on the inlet side end of the weighing platform while the vehicle to be weighed is placed on the weighing platform. Cannot weigh.

JP 2006-177722 A JP 2006-112986 A

  By the way, in this type of vehicle weight measuring device, the weighing vehicle cannot be accurately measured unless all the wheels of the weighing vehicle are placed at the normal positions on the weighing platform as described above. There was no way to determine whether or not the vehicle was in a normal position on the weighing platform other than relying on the visual observation of the operator.

  Therefore, conventionally, when it is difficult to see from the operator room whether or not all the wheels of the vehicle to be weighed are placed at normal positions on the weighing platform during weighing, the operator must go out of the operator room and check. Is necessary, and the confirmation work is troublesome, and there is a problem that the measuring time per unit becomes long.

  In view of this, the present invention provides a vehicle weight measuring device that enables the operator to check whether all the wheels of the vehicle to be weighed are in a normal position on the weighing platform when weighing the vehicle to be weighed. It was made for the purpose of doing.

  The present invention has the following configuration as means for solving the above problems.

Invention of Claim 1 The invention of claim 1 of the present application is a rectangular weighing platform having an area on which each wheel of a vehicle to be weighed can be placed, and at least four load detections provided near each corner of the weighing table. It is intended for a vehicle weight measuring device having a container (load cell) and weighing a vehicle to be weighed in a stopped state.

  The area of the weighing platform is not particularly limited. For example, a weighing platform having a width of about 3 m and a length of about 8 m (up to 20 m) can be used so that a large vehicle can be weighed. In addition, in the case where the length of the weighing table is increased, the load detector can be installed not only at the four corners but also at the intermediate portion in the length direction of the weighing table (the total number of load detectors is 4 to 8). Can be installed).

  An operator room is provided in the vicinity of the weighing platform installation position, and data from each load detector at the time of weighing is input to the controller in the operator room, and the total weight of the vehicle to be weighed is calculated by the controller. .

  The vehicle weight measuring apparatus according to claim 1 further comprises vehicle position confirmation means for confirming whether or not all the wheels of the vehicle are placed at the “normal position” on the weighing table when measuring the vehicle weight. Yes.

  As this vehicle position confirmation means, for example, a load detection sensor (stepping plate sensor) that can detect that a vehicle wheel is mounted, a light sensor that can confirm the position of the wheel, a wheel sensor such as a laser sensor, an ultrasonic sensor, A surveillance camera or the like that can photograph the entire vehicle can be employed. When a monitoring camera is used as vehicle position confirmation means, the position of the vehicle to be weighed placed on the weighing table with the monitoring camera (one or more) may be installed above the weighing table. It is possible to estimate whether or not each wheel (four wheels) of the vehicle is in the “normal position”.

  Data from the vehicle position confirmation means is also input to the controller in the operator room, and the controller determines whether or not all the wheels of the vehicle to be weighed are in the “normal position” on the weighing platform. If any one of all the wheels (front, rear, left and right four wheels) protrudes from the weighing platform, the controller determines that the position is abnormal by the signal from the vehicle position confirmation means.

  During weighing (for example, when the weighing start switch is turned on), when the controller determines that it is the “normal position”, it proceeds to a normal weighing calculation, and when the controller determines that it is the “abnormal position”, it does not proceed to the weighing calculation. Alarm. As an alarm indicating the “abnormal position”, a voice, an alarm sound, or a warning light can be adopted.

Invention of Claim 2 of the present application The invention of claim 2 of the present application is the vehicle weight measuring device according to claim 1, wherein as the vehicle position confirmation means, it is confirmed that a part of all the wheels of the vehicle to be weighed has protruded from the weighing platform. I adopt what I can do.

  As the vehicle position confirmation means used in the vehicle weight measuring device of this second aspect, for example, the load detection sensor (stepping plate sensor) is installed at a position closest to the outer periphery of the weighing table, and even one of all the wheels of the vehicle is weighed. Install the wheel detection sensor (for example, optical sensor) that monitors the wheel height position at the position closest to the outer circumference of the weighing table so that the protruding wheel steps on the load detection sensor when protruding from the table. For example, when one of all the wheels protrudes from the weighing platform, the protruding wheel can be detected by a wheel detection sensor.

  In the case of the vehicle position confirmation means according to the second aspect, the controller determines the “normal position” when all of the load detection sensor and the wheel detection sensor remain OFF, while the load detection sensor and the wheel If even one detection sensor is turned on, the controller determines that the “abnormal position” is described above.

  Further, in the case of the second aspect, in the case where guards for removing the wheel are provided on the right and left sides of the weighing table in the vehicle entrance direction, the vehicle position confirmation means may be provided only before and after the weighing table.

Invention of Claim 3 of the Present Invention The invention of claim 1 of the present application is the vehicle weight measuring device according to claim 1, wherein as the vehicle position confirmation means, it can be confirmed that all the wheels of the vehicle to be weighed are placed on the weighing platform. Is adopted.

  As vehicle position confirmation means used in the vehicle weight measuring device according to claim 3, for example, in a state where the vehicle to be weighed is placed at the "normal position" on the weighing platform, each wheel (four wheels) of the vehicle is measured. ) Where the load detection sensors (stepping board sensors) are respectively installed at the portions (4 locations) where the) is located. In this case, each load detection sensor (stepping board sensor) has an area that can cover a wide range of a portion where each wheel (four wheels) of the vehicle to be weighed placed in the range of “normal position” on the weighing platform is located. ing.

  In the case of claim 3, the controller determines the “normal position” only when all the four load detection sensors are turned on (when four wheels are respectively mounted) during weighing, If at least one of the load detection sensors maintains the OFF state, the controller determines that it is the “abnormal position”.

  In addition, it uses a long weighing platform that can accommodate large vehicles, and when placing a small vehicle to be weighed (the distance between the front and rear wheels is short), it was displaced near the front and rear ends on the weighing platform. In some cases, the position may belong to the above-mentioned “normal position”. In that case, a part of the four wheels (front wheel or rear wheel) may come off from the load detection sensor (stepping board sensor). The operator may instruct the driver to move the vehicle to be measured closer to the center (a position where all sensors can be turned on) and move the vehicle to be measured to a measurement enabled position.

  The vehicle weight measuring device of each invention of the present application (Claims 1 to 3) includes a vehicle for confirming whether or not all the wheels of the vehicle are placed in the “normal position” on the weighing platform when measuring the vehicle weight. Since the position confirmation means is provided, it is possible for the operator to check whether or not the vehicle to be weighed is in the “normal position” on the weighing platform at the time of weighing. (Without it)

  Therefore, in the vehicle weight measuring device of each invention of the present application, it is easy to confirm whether or not the vehicle to be weighed is in the “normal position” on the weighing platform, and the weighing time per vehicle can be shortened. effective.

  Further, in each invention of the present application, since the vehicle position confirmation means can confirm whether or not the vehicle to be weighed is in the “normal position”, the vehicle to be weighed is in the “abnormal position” (wheel protruding position). There is also an effect that weighing (miss weighing) can be avoided.

  Hereinafter, several embodiments of the present application will be described with reference to FIGS. 1 to 8. FIGS. 1 to 3 show a first embodiment, FIGS. 4 to 5 show a second embodiment, and FIGS. 8 shows a vehicle weight measuring device (track scale) of the third embodiment.

  First, the common configuration of each of the first to third embodiments will be described with reference to the drawings of FIGS. 1, 4, and 6. The vehicle weight measuring device of each of the embodiments includes the vehicle 2 to be weighed. A rectangular weighing table 11 having an area sufficient for placing all the wheels (22 to 25), and at least four load detectors (load cells) 12, 12 provided on the lower surface near the four corners of the weighing table 11. And a weighing device 1 having a controller 10 for calculating the total weight of the vehicle 2 to be weighed based on the detected values detected by the load detectors 12, 12,. In addition, the vehicle weight measuring device of each embodiment measures the weight of the vehicle 2 to be measured while stopped on the weighing platform 11.

  In each of the embodiments shown in FIGS. 1, 4 and 6, the vehicle 2 can enter the weighing table 11 from either side of the weighing table 11 in the longitudinal direction. For convenience, the left end of the weighing platform 11 is referred to as an inlet side end, and the right end of the weighing platform 11 is referred to as an outlet side end.

  The size of the weighing platform 11 is not particularly limited, but in each of the embodiments, for example, a width of about 3 m and a length of about 8 m (up to about 20 m) are provided in order to enable weighing of a large vehicle. Can be used. In addition, when the length of the weighing table is increased, it is conceivable that the vicinity of the intermediate portion in the length direction of the weighing table 11 is bent. However, when a long weighing table is used, the load detector 12 is connected to the four corner portions. In addition to the above, it can also be installed in the middle portion in the length direction of the weighing table 11 (4 to 8 load detectors 12 can be installed as a total number).

  In each of the embodiments, the entire circumference of the upper surface of the weighing table 11 and the traveling road surface are continuously flat. In another embodiment, guards for preventing wheel removal can be provided at each side edge portion (or the position closest to the outside of each side edge portion) facing the longitudinal direction of the weighing platform 11.

  Each load detector (load cell) 12, 12,... Shares and supports the total weight of the to-be-measured vehicle 2 when the to-be-measured vehicle 2 is placed on the weighing platform 11. In the weighing device 1, the detection values detected by the load detectors 12, 12,... Are A / D converted, and then input to the controller 10 via signal lines displayed in dotted lines. The total vehicle weight is calculated by summing.

  In the vehicle weight measuring devices of the first to third embodiments (FIGS. 1, 4, and 6), all the wheels 22 to 25 of the measured vehicle 2 are placed at “normal positions” on the weighing platform 11. Vehicle position confirmation means (3 to 5) for confirming whether or not the vehicle is present.

  When these vehicle position confirmation means (3-5) detect an “abnormal position” of the to-be-measured vehicle 2 as will be described later, the detection signals (signals indicated by dotted lines in FIGS. 1, 4 and 6). Line)) is input to the controller 10, and an alarm means (not shown) alerts the controller 10. Note that a voice, a warning sound, a warning light, or the like can be employed as the warning means.

  Hereinafter, individual embodiments will be described.

The first embodiment of FIGS. 1 to 3 The vehicle position confirmation means 3 of this first embodiment can confirm that all of the wheels 22 to 25 of the vehicle 2 to be weighed protrude from the weighing platform 11. Adopted. Specifically, as the vehicle position confirmation means 3, load detection sensors (stepping plate sensors) 31, 31... For detecting that the wheels of the vehicle 2 are placed on the outermost nearest sides of the outer circumference of the weighing platform 11 are provided. It is installed.

  As shown in FIG. 2, each load detection sensor 31 of the first embodiment elastically supports the lower surface of the tread plate 32 having a predetermined area by a plurality of springs 33, 33, and on the lower surface side of the tread plate 32. A limit switch 34 that is turned on when the tread plate 32 is pushed down is provided. The number of limit switches 34 may be one, but the sensitivity is better when a plurality of limit switches 34 are provided at intervals.

  In this first embodiment, a pair of load detection sensors 31 having a long length (substantially the same length as the long side of the weighing table 11) are provided at positions closest to the outside of each side edge portion facing the longitudinal direction of the weighing table 11. On the other hand, two each divided into right and left are provided at the respective outermost positions of the inlet side edge (left edge) and the outlet side edge (right edge) of the weighing platform 11. The load detection sensors 31 and 31 at the inlet side edge and the outlet side edge of the weighing platform 11 are divided into two parts in this embodiment, but in each of the other embodiments, a continuous 1 It may be a sheet. In addition, in the case where guards for preventing wheel removal are provided at each side edge portion (or a position closest to the outside of each side edge portion) facing the longitudinal direction of the weighing table 11, the load detection sensor 31 is an entrance of the weighing table 11. It may be provided only on the side edge and the outlet side edge (the load detection sensor on each side edge is omitted).

  Each load detection sensor 31, 31... Inputs the ON / OFF signal of the limit switch 34 (FIG. 2) below the tread 32 to the controller 10 via each signal line indicated by a dotted line in FIG. 1. Yes.

  The load detection sensors 31, 31,... Protrude from the weighing platform 11 even at any one wheel (22-25) of the vehicle 2 to be weighed, for example, as shown in FIGS. When this occurs, the protruding wheel rides on the tread 32 at the position and turns on the limit switch 34. An ON signal from the limit switch 34 is input to the controller 10, and the controller 10 Is in the “abnormal position” on the weighing platform 11. The operation after the controller 10 confirms the “abnormal position” will be described later.

  Further, in the first embodiment, as shown in FIG. 1, the vehicle body 21 of the vehicle 2 is positioned at the outermost positions of the entrance side edge (left edge) and the exit side edge (right edge) of the weighing platform 11. Car body detection sensors 35 and 35 for detecting whether or not they exist are provided. For each of the vehicle body detection sensors 35, 35, for example, an optical sensor, a laser sensor, an ultrasonic sensor or the like can be used. Each of the vehicle body detection sensors 35 and 35 may be a transmission type or a direct reflection type, but in this embodiment, a direct reflection type is adopted.

  Each of the vehicle body detection sensors 35 and 35 does not detect the protrusion of the wheels (22 to 25) like the load detection sensor 31, but measures as described later (shown in FIG. 3D). This is for detecting when two vehicles 2 and 2 are placed on the table 11 at the same time. In other embodiments, the vehicle body detection sensors 35 and 35 can be omitted.

  The vehicle weight measuring apparatus of the first embodiment functions as follows.

  At the time of weighing (for example, when the weighing start switch is turned on), when all the wheels 22 to 25 of the vehicle 2 to be weighed are placed in the “normal position” on the weighing table 11 as shown in FIG. Since the sensors 31, 31... (Limit switch 34) remain OFF, the controller 10 determines that the position is “normal position” and the controller 10 normally determines based on the detection values from the load detectors 12, 12. Metric calculation is advanced.

  On the other hand, when the vehicle 2 to be weighed is placed on the weighing platform 11, some of all the wheels 22 to 25 of the vehicle 2 to be weighed may protrude from the weighing platform 11. For example, FIG. 3A shows a state in which the left front wheel 22 protrudes to the side of the weighing table 11, and FIG. 3B shows that the front wheels 22 and 23 protrude from the outlet side end of the weighing table 11. FIG. 3 (C) shows a state in which the rear wheels 24 and 25 have not yet ridden on the inlet side end of the weighing platform 11 due to insufficient entry. In each state of FIGS. 3A to 3C, the to-be-measured vehicle 2 is in the “abnormal position”, and the limit switch 34 (FIG. 2) of any (one or more) load detection sensors 31 is It is ON.

  When the weighing vehicle 2 is in the “abnormal position”, for example, when the measurement start switch is turned on, the controller 10 receives an ON signal from the limit switch 34 and the controller 10 is in the “abnormal position”. The controller 10 activates the alarm means to notify the operator and the driver that the to-be-measured vehicle 2 is in the “abnormal position”. When the controller 10 determines the “abnormal position”, the weighing calculation is interrupted (therefore, no erroneous weighing is performed). Then, when a warning that the to-be-measured vehicle 2 is in the “abnormal position” is notified, the to-be-measured vehicle 2 is moved to the “normal position”, thereby releasing the “abnormal position” detection of the controller 10. , Weighing calculation is possible.

  Further, when the weighing platform 11 is long and the weighing vehicle 2 is relatively small, for example, as shown in FIG. 3D, the preceding weighing vehicle 2 is “normal” at a position near the exit on the weighing platform 11. It is also expected that the following vehicle 2 rides on the entrance side end on the weighing platform 11 in the state of “position”. That is, in the state of FIG. 3D, all the load detection sensors 31, 31,... Around the weighing platform 11 remain OFF, and the “abnormal position” signal from each load detection sensor is Although it is not emitted, it is clearly abnormal. By the way, as shown in FIG. 3D, when the two front and rear vehicles 2 and 2 are riding on the weighing table 11 at the same time, the front portion of the vehicle body 21 of the preceding vehicle 2 is the edge on the outlet side of the weighing table 11. The vehicle body detection sensor 35 at the outlet side edge detects the vehicle body 21 of the preceding vehicle 2, while the vehicle body 21 of the subsequent vehicle 2 extends from the inlet edge of the weighing platform 11. The vehicle body detection sensor 35 that protrudes rearward and is located at the entrance side edge detects the vehicle body 21 of the succeeding vehicle 2. Detection signals from the vehicle body detection sensors 35 and 35 are respectively input to the controller 10 like signal lines indicated by dotted lines in FIG.

  And in this 1st Example, when a vehicle body detection signal is each emitted from both the vehicle body detection sensors 35 and 35 in an exit side edge part and an entrance side edge part, it will judge that it is in an abnormal state in the controller 10, and will be measured. The weighing calculation is interrupted in the same manner as when the vehicle 2 is in the “abnormal position”. Accordingly, no erroneous weighing is performed in this case. In this case, if the succeeding vehicle 2 riding on the entrance portion of the weighing table 11 is lowered from the weighing table 11, the weighing calculation by the controller 10 becomes possible.

Second Embodiment of FIGS. 4 to 5 The vehicle position confirmation means 4 of this second embodiment is capable of confirming that all the wheels 22 to 25 of the vehicle 2 to be weighed are normally placed on the weighing platform 11. Adopted. Specifically, as shown in FIG. 4, as the vehicle position confirmation unit 4, each wheel (four wheels) of the vehicle 2 in a state where the vehicle 2 to be measured is placed at the “normal position” on the weighing table 11. ) The load detection sensors 41, 41,... Are respectively installed in the portions (four locations) where 22 to 25 are located.

  Like the load detection sensor 31 of the first embodiment (FIG. 2), the load detection sensors 41, 41,... Used in the second embodiment support the tread plate 42 with a spring, while the tread plate 42. The one with a limit switch on the bottom side is used.

  The load detection sensors (stepping plate sensors) 41, 41,... Of the second embodiment are portions where the wheels 22 to 25 of the to-be-measured vehicle 2 placed in the “normal position” range on the weighing platform 11 are located. Has an area that can cover a wide area. These (four) load detection sensors 41, 41,... Are turned on by the load when the wheel (22-25) is placed on the tread plate 42, and each 0N signal is a signal displayed in dotted lines in FIG. Each is input to the controller 10 like a line.

  In the vehicle position confirmation means 4 of the second embodiment, during weighing, each wheel (four wheels) of the vehicle 2 to be weighed has four load detection sensors 41, 41,. Only when the load detection sensors 41, 41,... Are all turned on, the controller 10 determines that the "normal position" and the load detection sensors 41, 41,. If at least one of these remains in the OFF state, the controller 10 determines that it is an “abnormal position”.

  At the time of measurement (for example, when the measurement start switch is turned on), as shown in FIG. 4, in a state where all the wheels 22 to 25 of the measured vehicle 2 are respectively placed on the “normal position” on the measurement table 11, Each of the load detection sensors 41, 41,... Is turned ON, and the controller 10 determines that it is a “normal position” based on each ON signal, and the controller 10 is based on the detection values from the load detectors 12, 12,. The normal weighing calculation proceeds.

  On the other hand, when the vehicle 2 to be weighed is placed on the weighing platform 11, some of all the wheels 22 to 25 of the vehicle 2 to be weighed may protrude from the weighing platform 11. For example, FIG. 5A shows a state in which the left front wheel 22 protrudes to the side of the weighing table 11, and FIG. 5B shows that the front wheels 22 and 23 protrude from the outlet side end portion of the weighing table 11. FIG. 5 (C) shows a state in which the rear wheels 24 and 25 have not yet ridden on the entrance side end of the weighing platform 11 due to insufficient entry, and both the vehicle 2 to be weighed is in the “abnormal position”. . And in each abnormal state of Drawing 5 (A)-(C), any (one or a plurality) of four load detection sensors 41 and 41 .. is OFF.

  If any one of the four load detection sensors 41, 41,... Is in the OFF state in this way, the controller 10 determines that the “abnormal position” and does not perform the weighing calculation and issues an alarm. become. When an alarm indicating “abnormal position” is issued, the vehicle 2 to be weighed is moved to the “normal position” on the weighing platform 11, and the vehicle 2 to be weighed is positioned at the “normal position”. Weighing calculation is possible.

  In this second embodiment, even if the vehicle 2 to be weighed is displaced toward the front and rear end portions on the weighing platform 11, it may belong to the “normal position” in the above measurement. A part (front wheel or rear wheel) may come off from the load detection sensor 41. In this case, the operator moves the vehicle 2 to be measured toward the center (a position where all the sensors 41, 41,... Can be turned on). ) To move the vehicle 2 to the weighing position.

  In the second embodiment, as in the first embodiment, the vehicle 2 is positioned at the outermost positions of the entrance side edge (left edge) and the exit side edge (right edge) of the weighing platform 11. Car body detection sensors 45 and 45 for detecting whether or not the car body 21 exists are provided. Each of the vehicle body detection sensors 45, 45 can be, for example, an optical sensor, a laser sensor, an ultrasonic sensor, or the like, as in the first embodiment.

  Then, as shown in FIG. 5D, when two vehicles 2 and 2 are simultaneously mounted on the weighing platform 11, the vehicle body detection sensor 45 at the edge of the exit side detects the vehicle body 21 of the preceding vehicle 2. Then, the vehicle body detection sensor 45 at the entrance side edge detects the vehicle body 21 of the succeeding vehicle 2, and detection signals from the vehicle body detection sensors 45, 45 are respectively input to the controller 10 and the controller 10 is in an abnormal state. The measurement calculation is interrupted, and the calculation is interrupted and a warning is issued (in this case, no incorrect measurement is performed).

Third Embodiment of FIGS. 6 to 8 In the third embodiment , the vehicle position confirmation means 5 has a main sensor and a sub sensor.

  As a main sensor of the vehicle position confirmation means 5, 4 for detecting the wheels (22 to 25) protruding from the weighing table 11 at positions where the outermost four sides of the outer circumference of the weighing table 11 can be monitored. Two wheel detection sensors 51 are used.

Each of the wheel detection sensors 51, 51... Is provided at two positions on the diagonal part of the weighing table 11 for detecting two long sides on the outer side of the long side, and on the short side of the weighing table 11. For detecting the shortest side of the short side. The wheel detection sensors 51, 51,... Are installed at a height that can detect only the wheels (22 to 25). That is, as shown in FIG. 7B, the vehicle 2 can only see wheels (22 to 25) in the horizontal direction within the height H ₁ from the lower end 21a of the vehicle body 21 to the ground G, and each wheel detection sensor. .. Are installed so as to monitor a position slightly lower than the vehicle body lower surface height H ₁ as indicated by reference numeral H ₂ in FIG. Therefore, the wheel detection sensors 51, 51,... Do not detect the vehicle body 21 of the vehicle 2.

  Further, in the third embodiment, as a sub-sensor of the vehicle position confirmation means 5, vehicle body detection for detecting the vehicle body 21 protruding from the weighing table 11 at each outer closest position on the front and rear short sides of the weighing table 11. Sensors 52 and 52 are used.

Each of the vehicle body detection sensors 52 and 52 is installed at a height (for example, the height of H _{4 in} FIG. 7A) that is slightly lower than the height of the vehicle body 21 (for example, the loading platform height H ₃ in FIG. 7B). Each vehicle body detection sensor 52, 52 detects the vehicle body 21 when the vehicle 2 protrudes from the entrance side edge or the exit side edge of the weighing platform 11. Each of the vehicle body detection sensors 52, 52 is in a position where it overlaps with each of the wheel detection sensors 51, 51 for monitoring the short side of the weighing platform in the planar state of FIG.

  The detection signals from the four wheel detection sensors 51, 51,... And the two vehicle body detection sensors 52, 52 are input to the controller 10 through signal lines indicated by dotted lines in FIG. As the wheel detection sensor 51 and the vehicle body detection sensor 52 of the third embodiment, for example, an optical sensor, a laser sensor, an ultrasonic sensor or the like can be used, and each sensor of the third embodiment is also of a direct reflection type. It has been adopted.

  The vehicle position confirmation means 5 of the third embodiment functions as follows. That is, at the time of weighing, as shown in FIG. 6, when each wheel (four wheels) of the to-be-measured vehicle 2 is placed on the weighing table 11, the wheel detection sensors 51, 51,. , The controller 10 determines that it is the “normal position”, and the controller 10 proceeds with normal weighing calculation.

  On the other hand, for example, the left front wheel 22 protrudes slightly to the side of the weighing table 11 as shown in FIG. 8A, or the front wheels 22 and 23 are at the outlet side end of the weighing table 11 as shown in FIG. The to-be-measured vehicle 2 is in an “abnormal position” in a state where it protrudes from the section, or in a state where each rear wheel 24, 25 has not yet ridden on the inlet side end of the weighing platform 11 as shown in FIG. Sometimes, one (one or more) of the four wheel detection sensors 51, 51 is turned on, and the controller 10 determines that the vehicle 2 to be weighed is in the “abnormal position”. Accordingly, at this time, the weighing calculation is not performed, an alarm is issued, and the to-be-measured vehicle 2 in the “abnormal position” is moved to the “normal position” on the weighing table 11.

  8A, the approach angle of the to-be-measured vehicle 2 is greatly deviated, and one wheel (the left front wheel 22 ') protrudes greatly from the long side edge of the weighing platform 11. In such a case, the wheel detection sensor 51 that monitors the long side may not be able to detect the protruding wheel 22 '. In this case, the four wheel detection sensors 51, 51... Are maintained in the OFF state, and the controller 10 may determine the “normal position”, but this is detected by the long-side monitoring wheel detection sensor 51. With the wheel 22 'protruding so much that it cannot, the driver or operator will easily notice that the vehicle position should be corrected (the vehicle is in "abnormal position").

  Also in this third embodiment, as shown in FIG. 8 (D), two vehicles 2 and 2 may be placed on the weighing platform 11 at the same time. The detection sensor 52 detects the vehicle body 21 of the preceding vehicle 2, the vehicle body detection sensor 52 at the entrance side edge detects the vehicle body 21 of the subsequent vehicle 2, and the detection signals from the vehicle body detection sensors 52, 52 are Each is input to the controller 10 to determine that the controller 10 is in an abnormal state, and the weighing calculation is interrupted (in this case also, no erroneous weighing is performed).

  In the vehicle weight measuring device of each embodiment of the present application, it is possible to easily confirm whether the vehicle 2 to be weighed is in the “normal position” or the “abnormal position” on the weighing platform 11 as described above, and the vehicle 2 to be weighed. Is in the “abnormal position”, the measurement calculation by the controller 10 is interrupted, so that no erroneous measurement is performed and highly reliable measurement data can be provided.

It is a top view of the vehicle weight measuring apparatus of 1st Example of this application. It is sectional drawing of the load detection sensor part of FIG. (A)-(D) is explanatory drawing of the "abnormal position" of the vehicle in the vehicle weight measuring apparatus of FIG. 1, respectively. It is a top view of the vehicle weight measuring apparatus of 2nd Example of this application. (A)-(D) is explanatory drawing of the "abnormal position" of the vehicle in the vehicle weight measuring apparatus of FIG. 4, respectively. It is a top view of the vehicle weight measuring apparatus of 3rd Example of this application. It is explanatory drawing of the installation height of the vehicle position confirmation means used for FIG. (A)-(D) is explanatory drawing of the "abnormal position" of the vehicle in the vehicle weight measuring apparatus of FIG. 6, respectively.

Explanation of symbols

  1 is a weighing device, 2 is a vehicle to be weighed, 3 to 5 are vehicle position confirmation means, 10 is a controller, 11 is a weighing platform, 12 is a load detector, 21 is a vehicle body, 22 to 25 are wheels, and 31 is load detection. A sensor, 32 is a footboard, 35 is a vehicle body detection sensor, 41 is a load detection sensor, 42 is a footboard, 45 is a vehicle body detection sensor, 51 is a wheel detection sensor, and 52 is a vehicle body detection sensor.

Claims (3)

  A rectangular weighing platform (11) having an area on which each wheel (22-25) of the vehicle to be weighed (2) can be placed, and at least four load detections provided near each corner of the weighing platform (11) A vehicle weight measuring device for weighing the vehicle to be weighed (2) in a stopped state, wherein all the wheels (22 to 22) of the vehicle (2) are measured at the time of weighing the vehicle weight. 25) A vehicle weight measuring device comprising vehicle position confirmation means (3 to 5) for confirming whether or not 25) is placed at a normal position on the weighing platform (11).   In the first aspect, the vehicle position confirmation means (3, 5) can confirm that a part of all the wheels (22-25) of the vehicle to be weighed (2) protrudes from the weighing platform (11). There is a vehicle weight measuring device.   The vehicle position confirmation means (4) according to claim 1, wherein the vehicle position confirmation means (4) can confirm that all the wheels (22 to 25) of the vehicle to be weighed (2) are placed on the weighing platform (11). Vehicle weight measuring device.

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