JP2013130523A - Vehicle measurement base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately acquire center-of-gravity information including the height of the center of gravity in a vehicle.SOLUTION: An inclination measurement base 30 with the application of the present invention includes: a left inclination placement base 310 for simultaneously placing all the left wheels 110, 110, ..., of a vehicle 100; and a right inclination placement base 320 for simultaneously placing all the right wheels 120, 120, .... The left inclination placement base 310 is supported by six double convex type load cells 312, 312, ..., and joint parts of the left inclination placement base 310 with the respective load cells 312, 312, ..., are on the same plane. Joint parts of the respective load cells 312, 312, ..., with the bottom surface of a pit 56 being a foundation part are also on the same plane. By the configuration, the respective load cells 312 enables accurate load detection without being affected by a flexural strain, etc. The right inclination placement base 320 is supported by six dummy load cells 322 and the support structure is the same as that of the left side.

Description

  The present invention relates to a vehicle weighing platform, and more particularly to a vehicle weighing platform used in a vehicle weighing device having a function of obtaining center of gravity information including the height of the center of gravity of a vehicle.

  Conventionally, as a vehicle weighing device having a function of obtaining center of gravity information including the height of the center of gravity of a vehicle, for example, there is one disclosed in Patent Document 1. According to this prior art, a tilting table that is pivotally supported at one end, a vertical movement mechanism that supports the other end of the tilting table so as to be movable up and down, and at least two disposed on the tilting table at an interval. There are provided two load cells, a loading plate for the object to be measured supported by each load cell, and a restricting means for restricting only the movement of the loading plate along the upper surface of the tilting table. In this configuration, first, a vehicle as an object to be measured is placed on a loading board on a tilting table. Then, the tilting table is set in a horizontal posture by the vertical movement mechanism, that is, the vehicle on the loading board is set in the horizontal posture. At this time, based on the detected load value obtained from each load meter, the weight of the vehicle and the position of the center of gravity in the left-right direction of the vehicle are obtained. Subsequently, the tilting table is brought into the inclined posture by the vertical movement mechanism, that is, the vehicle on the loading board is brought into the inclined posture. At this time, the height of the center of gravity of the vehicle is obtained based on the detected load value obtained from each load meter and the weight and the position of the center of gravity of the vehicle obtained previously. In addition, each load cell is fixed on the tilting table, and in addition, since the regulation means is provided, even if the tilting table tilts, the relative position between the loading board and each load cell does not change. It is said that the measured values do not vary.

Japanese Patent Publication No. 63-9606

  By the way, in the above-mentioned prior art, since each load meter is arrange | positioned on a tilting base, when the said tilting base is in a tilting posture as shown, for example in FIG. Are at different height positions. And the loading board supported by each load cell is also in an inclined posture like the tilting table. At this time, the loading board moves (in other words, slips down) in the direction of inclination when a force due to its own weight (and the weight of the vehicle when the vehicle is placed) acts on the loading board. However, the movement of the loading board is regulated by the regulating means. As a specific example of this restricting means, a pair of rods are adopted, and one end of each rod is connected to the loading board via a pivot, and the other end of each rod is connected via another pivot. The movement of the loading board is regulated by being connected to the tilting table.

  Here, paying attention to the connecting portion between the loading disc and each rod (one end thereof) when the loading disc is in an inclined posture, the relationship of the forces acting on the connecting portion is illustrated, for example, in FIG. It becomes like this. In FIG. 7, a point denoted by Q represents a connecting portion between the loading board and each rod. Further, θ represents an inclination angle with respect to the horizontal direction of the loading board. According to FIG. 7, the force Wa due to the weight of the loading board (and the weight of the vehicle when the vehicle is placed) is determined along the inclination direction of the loading board (strict Acts on the slope). At the same time, the reaction force Wa of the force Wa applied to the rod acts along the extending direction of the rod (strictly in the direction from one end of the rod toward the other end) with the connecting portion Q as a base point. At this time, it is ideal that the loading board tilt direction and the rod extending direction are exactly opposite to each other, and more specifically, it is ideal that the direction of the force Wa and the direction of the reaction force Wb are exactly opposite. In this ideal state, the magnitude of the force Wa and the magnitude of the reaction force Wb are completely equivalent.

  However, the state shown in FIG. 7 is ideal until it gets tired, and in reality, there is no guarantee that such an ideal state will be obtained. This is due to the connection position and connection state of each rod with respect to the loading board and the tilting table. That is, depending on the connection position and connection state of each rod with respect to the loading table and the tilting table, the inclination direction of the loading plate and the extending direction of each rod are not exactly opposite, that is, the direction of the force Wa and the reaction force Wb. The direction of may not be the opposite. For example, as shown in FIG. 8, if the extending direction of the rod is deviated from the ideal direction by an angle α, the resultant force Wc of the force Wa and the reaction force Wb acts on the connecting portion Q. Then, when this resultant force Wc acts on each load meter, an error occurs in the load detection value of each load meter, and the measurement accuracy of the height of the center of gravity of the vehicle is lowered. FIG. 8 shows a case where the rod extending direction is shifted in a direction lower than the ideal direction. On the contrary, the rod extending direction is shifted in a direction higher than the ideal direction. That is, it is possible that the resultant force Wc acts upward. In particular, this is the case when the loading board is bent by placing the vehicle on the loading board. Moreover, since the way of bending of the loading board changes depending on the weight and position of the vehicle placed thereon, the magnitude of the resultant force Wc also changes accordingly. In addition, when the loading board is bent, a force in an unintentional direction is applied to the joint part (the top of the head) of each load cell fixed on the tilting table with the loading board. There is a risk of applying a so-called lateral force across the direction of the force to be detected by the meter (W1 ″ and W2 ″ in FIG. 5 of Patent Document 1). Since this lateral force acts as a bending moment on each load cell, bending strain is generated in each load cell. Even when this bending strain occurs, an error occurs in the load detection value by each load meter, and the measurement accuracy of the height of the center of gravity of the vehicle is lowered.

  In addition, FIG. 3 of Patent Document 1 discloses another configuration. Specifically, a loading board on which an object to be measured is placed, and a load meter that supports one end of the loading board, A configuration comprising a movable support leg that enables the load meter to move in the horizontal direction, another load meter that supports the other end of the loading board via a male screw, and a drive device that moves the male screw up and down. It is disclosed. Here, the loading board and each load cell are joined in a semi-fixed manner called pivot. Thus, since the loading board and each load meter are joined in a semi-fixed manner called pivot, for example, even when the loading board is in an inclined posture, the loading board does not slide down. However, when the loading board is in an inclined posture, the loading board is inclined with respect to each load meter due to the action of force due to its own weight (and the weight of the vehicle when the vehicle is placed). A force along the direction (strictly toward the direction of decreasing the inclination) is applied, and in short, a lateral force is applied. This lateral force acts as a bending moment on each load cell, and as a result, bending strain is generated in each load cell. In particular, a large bending moment corresponding to the amount of extension of the male screw acts on the load cell (on the right side in FIG. 3 of Patent Document 1) joined to the loading board via the male screw. Bending distortion occurs. When this bending distortion occurs, an error occurs in the load detection value by each load meter, and the measurement accuracy of the height of the center of gravity of the vehicle is lowered. In the configuration shown in FIG. 3 of Patent Document 1, bending strain is generated in each load cell when the loading board is bent. Specifically, since the loading board and each load cell are joined in a semi-fixed manner called pivot as described above, when the loading board is bent, the loading machine is pulled by the lateral direction to each load cell. A force is applied, that is, a bending moment acts. And the bending distortion generate | occur | produces in each load cell by the effect | action of this bending moment. In particular, in a load cell joined to the loading board via a male screw, a large bending strain is generated according to the extension amount of the male screw. Also, the bending strain caused by the bending of the loading board causes an error in the load detection value by each load meter, and consequently the measurement accuracy of the height of the center of gravity of the vehicle is lowered. In any case, the conventional technique including the configuration shown in FIG. 3 of Patent Document 1 has a problem that the height of the center of gravity of the vehicle cannot be obtained accurately.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle weighing platform for a vehicle weighing device that can accurately obtain center-of-gravity information including the height of the center of gravity of the vehicle.

  In order to achieve this object, the present invention provides a vehicle weighing platform used in a vehicle weighing device having a function of obtaining center of gravity information including the height of the center of gravity of a vehicle, and all or some of the wheels belonging to the vehicle. Is placed between the mounting table and the base part below the mounting table, and the vehicle is inclined when all or some of the wheels are mounted. And a plurality of load detecting means for detecting the load applied via the mounting table and for calculating the gravity center information. Here, each load detection means is in a posture for detecting a force in the vertical direction. And the junction part of a mounting base and each load detection means exists on the same horizontal surface. Furthermore, the joint portion between the base portion and each load detecting means is also on the same horizontal plane.

  According to this configuration, when all or some of the wheels belonging to the vehicle are mounted on the mounting table, the vehicle is inclined. In this state, each load detection means detects a load applied to itself via the mounting table. Then, based on the load detection result by each load detection means, calculation of the center of gravity information including the height of the center of gravity of the vehicle is performed. Here, each load detection means is in a state of being sandwiched between the mounting table and the base portion below the mounting table. Each load detecting means is in a posture for detecting a force in the vertical direction, that is, in an ideal (or normal) posture for detecting a load. Furthermore, the joint portion between the mounting table and each load detecting means is on the same horizontal plane, that is, at the same height position. Therefore, the mounting table supported by each load detecting means does not slide down. In other words, there is no need to provide a restricting means as in the above-described prior art. Further, unlike the configuration shown in FIG. 3 of the related art (Patent Document 1), the weight of the mounting table (and the vehicle is mounted) on the joint portion of each load detecting means with the mounting table. In the case where the vehicle is present, a lateral force due to the weight of the vehicle does not act. Furthermore, the joint portion between the base portion and each load detecting means is also on the same horizontal plane, that is, at the same height position. Therefore, a lateral force due to the weight of the mounting table (and the weight of the vehicle when the vehicle is mounted) does not act on the joint portion of each load detecting means with the base portion. . That is, a bending moment due to the weight of the mounting table (and the weight of the vehicle when the vehicle is mounted) does not act on each load detecting means.

  In the present invention, each load detecting means may be a double convex load cell having a substantially columnar strain body formed so that both ends protrude in a substantially hemispherical shape. In this case, each load detection means has a posture in which the strain generating body is erected so that one end of the strain generating body is in contact with the mounting table and the other end of the strain generating body is in contact with the base portion. Is done. That is, each load detecting means (one end of the strain generating body) and the mounting table are movably joined to each other, and each load detecting means (the other end of the strain generating body) and the base part are also connected. Movably joined. According to this configuration, for example, when the mounting table bends due to the vehicle being mounted on the mounting table, the load detecting means (straining body) tilts following this, and more specifically, Tilt so that the joint portion of the strain body with the mounting table and the joint portion of the strain body base with respect to a certain vertical line are symmetric (strictly speaking, point symmetry with respect to a certain point on the vertical line). Roll. At this time, each load detecting means naturally generates a force for restoring itself in a direction opposite to the tilt direction. The generation of this restoring force reduces (cancels) the magnitude of the bending moment acting on each load detecting means (straining body), thereby reducing the occurrence of bending strain.

  As described above, according to the present invention, since there is no need to provide a regulating means as in the prior art, no measurement error occurs due to the provision of the regulating means. Also, unlike the configuration shown in FIG. 3 of the prior art (Patent Document 1), it depends on the weight of the mounting table with respect to each load detecting means (and the weight of the vehicle when the vehicle is mounted). The bending moment does not act, and therefore, bending strain due to the weight of the mounting table (and the weight of the vehicle when the vehicle is mounted) does not occur. Therefore, the center of gravity information including the height of the center of gravity of the vehicle can be obtained more accurately than before.

1 is an illustrative view schematically showing an overall configuration of a vehicle weighing system according to an embodiment of the present invention. It is an illustration figure which shows the specific structure of the horizontal weighing platform in the embodiment. It is an illustration figure which shows the specific structure of the inclination weighing platform in the embodiment. It is an illustration figure for demonstrating the calculation point of the gravity center position in the left-right direction of the vehicle in the embodiment. It is an illustration figure for demonstrating the calculation point of the gravity center height of the vehicle in the embodiment. It is an illustration figure which shows another example of the inclination weighing platform in the same embodiment. It is an illustration figure which shows the ideal state for demonstrating the subject in a prior art. It is an illustration figure for demonstrating the subject in a prior art, referring FIG.

  An embodiment of the present invention will be described by taking the vehicle weighing system 10 shown in FIG. 1 as an example.

  As shown in FIG. 1, a vehicle weighing system 10 according to this embodiment includes a horizontal weighing platform 20, an inclined weighing platform 30 to which the present invention is applied, and the horizontal weighing platform 20 and the inclined weighing platform 30 are electrically connected. And a processor 40 connected to the. Of these, the horizontal weighing platform 20 is arranged so as to form a part of a passageway (road surface) 50 laid in an appropriate site, and the inclined weighing platform 30 is another part of the passageway 50. It arrange | positions so that a part may be formed. And the processor 40 is arrange | positioned in suitable indoors, such as a management room in the same site. The passage 50 is laid so as to pass the vehicle 100 as an object to be weighed according to a predetermined route (from the left side to the right side in FIG. 1), and the surface thereof (the horizontal weighing table 20 and the inclined road) It is paved with a suitable paving material such as asphalt or concrete (except where the weighing platform 30 is located). Further, as will be described later, the periphery of the portion where the horizontal weighing platform 20 is disposed in the passageway 50 is horizontal, and the periphery of the portion where the inclined weighing platform 30 is disposed is the traveling direction of the vehicle 100 ( Although it is horizontal in the direction of extension of the passage 50, it is inclined at a predetermined angle θ with respect to the horizontal direction in the direction perpendicular to the traveling direction of the vehicle 100 (width direction of the passage 50). Yes. The predetermined angle θ is an acute angle, for example, 10 degrees.

  More specifically, as shown in FIG. 2, the horizontal weighing platform 20 includes a left horizontal mounting table 210 on which all left wheels (tires) 110, 110,. All the right wheels 120, 120,... Belonging to the vehicle 100 have a right horizontal mounting table 220 that can be mounted simultaneously. The left horizontal mounting table 210 and the right horizontal mounting table 220 are substantially rectangular metal flat plates having the same shape and the same dimensions as each other, and each one main surface is directed right above as an upper surface, and each other main surface. Is directed directly downward as a lower surface, and is in a line-symmetrical positional relationship with respect to a straight line along the traveling direction of the vehicle 100, for example, the center line 50a of the passage 50, and in addition, each long side of the center line 50a It is provided so that it may become parallel across. The long side dimension of each of the left horizontal mounting table 210 and the right horizontal mounting table 220, that is, the length dimension L1, is larger than the farthest axial distance (the distance between the front and rear wheel axes) La of the vehicle 100 ( L1> La). The total width dimension L2 of the left horizontal mounting table 210 and the right horizontal mounting table 220 is the maximum distance between the left and right wheels 110, 110,... And 120, 120,. (L2> Lb). Further, each of the left horizontal mounting table 210 and the right horizontal mounting table 220 is reinforced by an appropriate reinforcing member such as a rib (not shown).

  The horizontal weighing platform 20 forms a part of the passage 50 as described above. Strictly speaking, a part of the passage 50 is formed by the upper surfaces of the left horizontal mounting table 210 and the right horizontal mounting table 220, respectively. The Therefore, the passage 50 is provided with a pit 52 having a substantially rectangular hole shape, and the left horizontal mounting table 210 and the right horizontal mounting table 220 are provided in the pit 52 with the upper surfaces of the passage 50. (Strictly speaking, a portion of the surface of the passageway 50 excluding the respective surfaces of the left horizontal placement table 210 and the right side horizontal placement table 220), in other words, a series of horizontal planes 54 are formed together with the surface of the passageway 50. To be housed. Further, the left horizontal mounting table 210 and the right horizontal mounting table 220 are supported in the pit 52 by a plurality of load cells 212, 212,.

  For example, the left horizontal mounting table 210 is supported by six load cells 212, 212,. Each of the load cells 212, 212,... Has the same specification, and more specifically, is a double convex type having a substantially cylindrical strain body formed so that both ends protrude in a substantially hemispherical shape. Although not shown, a plurality of strain gauges are attached to the outer peripheral wall of the strain generating body, and the plurality of strain gauges are connected to a Wheatstone bridge to constitute a load detection circuit. Each of the load cells 212, 212,... Is located in the left horizontal mounting table 210 in an upright posture in the vicinity of the periphery of the lower surface of the left horizontal mounting table 210, specifically, in the vicinity of the four corners and the center of each long side. It arrange | positions so that it may be in the state pinched | interposed between the lower surface of the mounting base 210, and the bottom face of the pit 52 as a foundation part. In addition, the lower surface of the left horizontal mounting table 210 and the upper side ends of the load cells 212, 212,... (Distortion bodies) are simply in contact with each other, that is, they are movably joined. In addition, the joint (contact) portion with the upper end of each load cell 212, 212,... On the lower surface of the left horizontal mounting table 210 is formed in a horizontal plane including its peripheral portion. Also, the bottom surface of the pit 52 and the lower side end portions of the load cells 212, 212,... Are simply in contact with each other, that is, are movably joined. At the same time, the joint portion of the bottom surface of the pit 52 with the lower end portion of each load cell 212, 212,... Is also formed in a horizontal plane including its peripheral portion.

  Similarly, the right horizontal mounting table 220 is supported by six load cells 222, 222,. These right load cells 222, 222,... Have the same specifications as the above left load cells 212, 212,..., And each strain body has an upright posture in the vicinity of the periphery of the lower surface of the right horizontal mounting table 220. It is arranged so as to be sandwiched between the lower surface of the right horizontal mounting table 220 and the bottom surface of the pit 52. The lower surface of the right horizontal mounting table 220 and the upper end of each right load cell 222, 222,... Are simply in contact with each other, and the right load cells 222, 222,. The joint portion is formed in a horizontal plane including its peripheral portion. Also, the bottom surface of the pit 52 and the lower side end portions of the right load cells 222, 222,... Are in contact with each other, and the lower side end portions of the right load cells 222, 222,. The joint portion is formed in a horizontal plane including its peripheral portion.

  According to the horizontal weighing platform 20 configured in this way, all the left wheels 110, 110,... Belonging to the vehicle 100 are placed on the left horizontal placement table 210 while the vehicle 100 is passing along the passage 50. In addition, a state in which all the right wheels 120, 120,... Are placed on the right horizontal mounting table 220 is formed, that is, a state in which the vehicle 100 is completely placed on the horizontal weighing table 20 is formed. When in this state, the vehicle 100 assumes a horizontal posture. Each of the left load cells 212, 212,... That supports the left horizontal mounting table 210 is an analog having a magnitude (for example, a voltage value) corresponding to a load applied to the left load cells 212, 212,. Outputs load detection signal. In other words, the left analog load detection signal is input to the processor 40. In addition, each of the right load cells 222, 222,... That supports the right horizontal mounting table 220 also has an analog load detection signal having a magnitude corresponding to the load applied to the right load cell 222 through the right horizontal mounting table 220. Is output. This right analog load detection signal is also input to the processor 40.

  Here, when attention is paid again to each left load cell 212, as described above, each left load cell 212 is in a posture in which the strain body is in an upright position, that is, ideal for detecting a vertical force such as a load. Is in an attitude. And the junction part with the said each left side load cell 212 in the lower surface of the left side horizontal mounting base 210 is formed in horizontal plane shape including the peripheral part, ie, a plane perpendicular | vertical to the perpendicular direction which is an application direction of a load. Is made. Therefore, the load applied to each left load cell 212 using the joint portion as a power point is applied straight to each left load cell 212. Further, the load applied to each left load cell 212 is received by the bottom surface of the pit 52. In other words, the reaction force of the load from the bottom surface of the pit 52 is applied to each left load cell 212. And the junction part with each left side load cell 212 in the bottom face of pit 52 is also formed in the horizontal plane shape including the peripheral part, ie, has constituted the plane perpendicular to the perpendicular direction. Accordingly, the load reaction force applied to each left load cell 212 with the joint portion as a power point is applied along the vertical direction, that is, straight to each left load cell 212. Thus, each left load cell 212 accurately detects the load applied to it.

  In addition, since each left load cell 212 is of a double convex type, there are the following advantages. That is, when the left horizontal mounting table 210 is bent due to the mounting of the vehicle 100 (left wheels 110, 110,...), The left load cell 212 is tilted following this, and more specifically, each left horizontal mounting table is tilted. The joint portion with the mounting table 210 and the joint portion with the bottom surface of the pit 52 are tilted so as to be symmetrical with respect to a certain vertical line (strictly speaking, point-symmetric with respect to a certain point on the vertical line). At this time, each left load cell 212 naturally generates a force to restore itself in the direction opposite to the tilt direction. The generation of the restoring force reduces (cancels) the action of the bending moment with respect to each left load cell 212, thereby reducing the occurrence of bending strain. In addition, when the bending of the left horizontal mounting table 210 is eliminated, each left load cell 212 automatically returns to the original upright posture.

  When attention is again paid to each right load cell 222, each right load cell 222 is also in a posture in which the strain generating body is upright, that is, in an ideal posture for detecting a vertical force such as a load. is there. And the junction part with the said each right load cell 222 in the lower surface of the right side horizontal mounting base 220 is formed in horizontal plane shape including the peripheral part, ie, a plane perpendicular | vertical to the perpendicular direction which is an application direction of a load. Is made. Therefore, the load applied to each right load cell 222 with the joint portion as a power point is applied straight to each right load cell 222. Further, the load applied to each right load cell 222 is received by the bottom surface of the pit 52. In other words, the reaction force of the load from the bottom surface of the pit 52 is applied to each right load cell 222. And the junction part with each right side load cell 222 in the bottom face of pit 52 is also formed in the horizontal plane shape including the peripheral part, ie, has constituted the plane perpendicular to the perpendicular direction. Therefore, the load reaction force applied to each right load cell 222 with the joint portion as a force point is applied along the vertical direction, that is, straight to each right load cell 222. Thus, each right load cell 222 also accurately detects the load applied to it. That is, it is not affected by bending strain.

  Each right load cell 222 also has the above-mentioned advantages as a double convex type.

  On the other hand, as shown in FIG. 3, the inclination weighing unit 30 includes a left inclined mounting table 310 on which all left wheels 110, 110,... Belonging to the vehicle 100 can be simultaneously mounted, and all right wheels belonging to the vehicle 100. 120, 120,... Have a right-side inclined mounting table 310 that can be mounted simultaneously. The left inclined mounting table 310 and the right inclined mounting table 320 are metal inclined tables having the same shape and the same dimensions. Specifically, the upper surfaces of the left inclined mounting table 310 and the right inclined mounting table 320 are inclined surfaces. The load cells 312, 312,... And 322, 322,. In particular, the upper surface has a substantially rectangular shape when viewed from above, and is inclined counterclockwise with respect to the horizontal direction by the predetermined angle θ when viewed from the rear. When viewed from above, the left inclined mounting table 310 and the right inclined mounting table 320 are in a line-symmetrical positional relationship with respect to a straight line along the traveling direction of the vehicle 100, for example, the center line 50a of the passage 50, and Each one long side is provided so as to be parallel across the center line 50a. In addition, the length dimension L3 of each of the left inclined mounting table 310 and the right inclined mounting table 320 is basically the same as the length dimension L1 of each of the left horizontal mounting table 210 and the right horizontal mounting table 220 constituting the horizontal weighing unit 20. (L3 = L1). The total upper surface width dimension L4 of the left inclined mounting table 310 and the right inclined mounting table 320 is basically the same as the total width dimension L2 of the left horizontal mounting table 210 and the right horizontal mounting table 220 constituting the horizontal weighing unit 20. The same (L4 = L2). Further, each of the left inclined mounting table 310 and the right inclined mounting table 320 is reinforced by an appropriate reinforcing member such as a rib (not shown). Further, in FIG. 3, the view seen from the side as shown in FIG. 2A is omitted in view of the visibility.

  The inclined weighing table 30 also forms a part of the passage 50, particularly a part of the inclined passage 50. Strictly speaking, depending on the upper surfaces of the left inclined mounting table 310 and the right inclined mounting table 320, A part of the inclined passage 50 is formed. For this reason, a substantially rectangular hole-shaped pit 56 is provided in the passage 50, and the left-side inclined mounting base 310 and the right-side inclined mounting base 320 are inclined in the pit 56 with their upper surfaces inclined. (In other words, the portion of the surface of the inclined passageway 50 excluding the surfaces of the left inclined mounting table 310 and the right inclined mounting table 320), in other words, together with the surface of the inclined passageway 50 It is accommodated so as to form a series of inclined surfaces 58. Further, the left inclined mounting table 310 and the right inclined mounting table 320 are supported in the pit 56 by a plurality of load cells 312, 312,.

  For example, the left inclined mounting table 310 is supported by six load cells 312, 312,. These inclined side load cells 312, 312,... Have the same specifications as the left side load cells 212, 212,... And the right side load cells 220, 220,. 6 in the vicinity of the peripheral edge, specifically in the vicinity of the four corners and in the vicinity of the center of each long side, each strain generating body is in an upright position between the bottom surface of the left inclined mounting base 310 and the bottom surface of the pit 56 as the base portion. It is arranged so as to be sandwiched between the two. In addition, the lower surface of the left inclined mounting table 310 and the upper side end portions of the inclined load cells 312, 312,... In addition, the joint portion of the lower surface of the left inclined mounting table 310 with the upper end of each inclined load cell 312, 312,... Is formed in a horizontal plane including its peripheral portion. In addition, the bottom surface of the pit 56 and the lower side end portions of the inclined load cells 312, 312,... Are simply in contact with each other, that is, are movably joined. At the same time, the joint portion of the bottom surface of the pit 55 with the lower end portion of each inclined load cell 312, 312,... Is also formed in a horizontal plane including its peripheral portion.

  Similarly, the right inclined mounting table 320 is supported by six load cells 322, 322,. However, these load cells 322, 322,... Have load generating elements having the same specifications as the load cells 212, 212,..., 222, 222,. It is a so-called dummy that does not have a circuit, that is, does not have a load detection function. These dummy load cells 322, 322,... Are located between the lower surface of the right inclined mounting table 320 and the bottom surface of the pit 56 in the vicinity of the periphery of the lower surface of the right inclined mounting table 320. It is arranged so as to be sandwiched between the two. Further, a step 56a is provided on the bottom surface of the pit 56 so that a series of inclined surfaces 58 are formed as described above, that is, the dummy load cells 322, 322,. Are different from each other in the portion where the inclined load cells 312, 312,. .. And the upper end of each dummy load cell 322, 322,... Is simply in contact with each other, and each dummy load cell 322, 322,. The joint portion is formed in a horizontal plane including its peripheral portion. Further, the bottom surface of the pit 56 and the lower end portions of the dummy load cells 322, 322,... Are in contact with each other, and the lower end portions of the dummy load cells 322, 322,. The joint portion is formed in a horizontal plane including its peripheral portion.

  According to the tilt weighing platform 30 configured in this way, all the left wheels 110, belonging to the vehicle 100, in the middle of the passage of the vehicle 100, particularly after the vehicle 100 passes through the horizontal weighing unit 20, Are mounted on the left inclined mounting table 310, and all right wheels 120, 120,... Are mounted on the right inclined mounting table 320, that is, the vehicle 100 is mounted on the tilt weighing table 30. A completely mounted state is formed. When the vehicle 100 is in this state, as shown in FIG. 3 (b) in particular, when viewed from the rear, the vehicle 100 is in an inclined posture inclined by the predetermined angle θ counterclockwise with respect to the horizontal direction. . Note that the vehicle 100 is in a horizontal posture in the front-rear direction of the vehicle 100. And each inclination side load cell 312,312, ... which supports the left inclination mounting base 310 receives the analog load detection signal which has a magnitude | size according to the load applied to self via the said left inclination mounting base 310. FIG. Output. This so-called inclination side analog load detection signal is also input to the processor 40.

  Here, when attention is paid again to each of the inclined load cells 312, as described above, each of the inclined load cells 312 is in a posture in which the strain generating body is in an upright state, that is, it detects a vertical force such as a load. In an ideal posture. And the joint part with the said each inclination side load cell 312 in the lower surface of the left inclination mounting base 310 is formed in horizontal plane shape including the peripheral part, ie, perpendicular | vertical to the perpendicular direction which is an application direction of a load. It is a flat surface. Therefore, the load applied to each inclined load cell 312 with the joint portion as a power point is applied straight to each inclined load cell 312. Further, the load applied to each inclined load cell 312 is received by the bottom surface of the pit 56. In other words, the reaction force of the load from the bottom surface of the pit 56 is applied to each inclined load cell 312. And the junction part with each inclination side load cell 312 in the bottom face of pit 56 is also formed in the horizontal plane shape including the peripheral part, ie, has constituted the plane perpendicular to the perpendicular direction. Accordingly, the load reaction force applied to each inclined load cell 312 with the joint portion as a force point is applied along the vertical direction, that is, straight to each inclined load cell 312. Therefore, each inclined load cell 312 accurately detects the load applied to itself. That is, unlike the above-described prior art, which is affected by bending strain when the vehicle is in a tilted posture, a bending moment does not act on each tilt-side load cell 312, and naturally no bending strain is generated. Moreover, each inclination side load cell 322 has the above-mentioned advantage as a double convex type | mold.

  In addition, when the joint portion between the lower surface of the left inclined mounting table 310 and the upper end portion of each inclined load cell 312, 312,... Is viewed globally, these joint portions are on the same plane, that is, the same. In the height position. Accordingly, the left inclined mounting table 310 supported by each inclined load cell 312, 312,... Is connected to each inclined load cell 312, 312,. It will not slide down from the state supported by. In other words, it is not necessary to provide a restricting means as in the above-described prior art. Therefore, naturally, the measurement error due to the provision of the restriction means does not occur. Further, unlike the configuration shown in FIG. 3 of the prior art (Patent Document 1), with respect to the joint portion with the upper side end of each inclined load cell 312, 312,. The lateral force due to the weight of the left inclined mounting table 310 (and the weight when the left wheels 110, 110,... Of the vehicle 100 are mounted) does not act. Further, when a joint portion between the bottom surface of the pit 56 as a base portion and the lower side end portion of each inclined load cell 312, 312,... Is viewed roughly, these joint portions are also on the same plane. At the same height. Therefore, the weight of the left inclined mounting table 310 (and the left wheels 110, 110,... Of the vehicle 100) is also applied to the joint portion of the bottom surface of the pit 56 with the lower end of each inclined load cell 312, 312,. When the is placed, a lateral force due to its weight) does not act. This also greatly contributes to the suppression of the action of the bending moment on the inclined load cells 312, 312,.

  Similarly, when attention is paid again to each dummy load cell 322, each dummy load cell 322 is also in a posture in which the strain generating body is made upright, that is, in the same posture as the inclined load cell 312. And the junction part with the said each dummy right load cell 222 in the lower surface of the right side inclination mounting base 320 is formed in horizontal plane shape including the peripheral part, ie, each inclination in the lower surface of the left side inclination mounting base 310 The structure (condition) is the same as that of the joint portion with the side load cell 312. Further, the load applied to each dummy load cell 322 is received by the bottom surface of the pit 56, in other words, the load reaction force from the bottom surface of the pit 56 is applied to each dummy load cell 322. Further, the joint portion with each dummy load cell 322 on the bottom surface of the pit 56 is also formed in a horizontal plane including its peripheral portion, that is, the joint with each inclined load cell 312 on the bottom surface of the pit 56. It has the same structure as the part. Each dummy load cell 322 has the above-described advantages (particularly, an automatic return function to an upright posture) as a double convex type. By adopting such a dummy load cell 322, the support structure by the dummy load cells 322, 322,... Of the right inclined mounting table 320 is supported by the inclined load cells 312, 312,. And unified.

  Further, when the joint portion between the lower surface of the right inclined mounting table 320 and the upper end portion of each dummy load cell 322, 322,. .. Are on the same plane, that is, at the same height position, similarly to the joint portion with the upper end of the inclined load cells 312, 312,. When the joint portion between the bottom surface of the pit 56 as a base portion and the lower side end portion of each dummy load cell 322, 322,... Is viewed as a whole, these joint portions also form the bottom surface of the pit 36 and each inclined side. Like the joints with the load cells 312, 312, ..., they are on the same plane, that is, at the same height. Thus, also from a global viewpoint, the support structure by each inclined load cell 312, 312,... Of the left inclined mounting table 310 and the support structure by each dummy load cell 322, 322,. Unification is planned.

  When the vehicle 100 is completely placed on the horizontal weighing platform 20, the processor 40 detects the left analog load detection signals obtained from the left load cells 212, 212,. Based on the right analog load detection signal obtained from the right load cells 222, 222,..., The total weight value W0 of the vehicle 100 and the position of the center of gravity G in the left-right direction of the vehicle 100 are obtained.

  Specifically, the processor obtains a load value applied to each of the left load cells 212, 212,... Based on the left analog load detection signal obtained from each of the left load cells 212, 212,. Based on the right analog load detection signal obtained from the right load cells 222, 222,..., The load value applied to each of the right load cells 222, 222,. Then, the processor adds up the applied load values to the respective left load cells 212, 212,..., Thereby adding the total value W1 of the loads applied to all the left wheels 110, 110,. , And the total load value W2 applied to all the right wheels 120, 120,... Of the vehicle 100 in the horizontal posture by adding the applied load values to the right load cells 222, 222,. Ask for. Further, the processor calculates the total weight value W1 of the vehicle 100 by adding the left applied load total value W1 and the right applied load total value W2, that is, based on the following equation (1).

<< Formula 1 >>
W0 = W1 + W2

  Next, the processor obtains the position of the center of gravity G in the left-right direction of the vehicle 100. For this, refer to FIG. FIG. 4 shows a state in which the vehicle 100 is completely placed on the horizontal weighing platform 20 by paying attention only to the mechanical elements in the left-right direction of the vehicle 100. In FIG. 4, the point denoted by P1 represents the support position by the left load cell group LC1, which is an aggregate of all the left load cells 212, 212,... The support position by right load cell group LC2 which is an aggregate | assembly of load cell 222,222, ... is represented. Point P0 represents the center between support positions P1 and P2 by left and right load cell groups LC1 and LC2, in other words, the center in the left-right direction of vehicle 100. Furthermore, the point Pg represents the position of the center of gravity G of the vehicle 100 on the virtual horizontal plane 54a passing through the support positions P1 and P2 by the left and right load cell groups LC1 and LC2.

  In FIG. 4, for example, when attention is paid to the moment about the support position P1 by the left load cell group LC1, the following formula 2 is established. Note that Lx in Equation 2 is the distance between the support position P1 by the left load cell group LC1 and the virtual gravity center position Pg. Ld is the distance between the left and right wheels 110 and 120 of the vehicle 100 and is known.

<< Formula 2 >>
Lx · W0 = Ld · W2

  When this formula 2 is transformed into a formula for the distance Lx, the following formula 3 is obtained.

<< Formula 3 >>
Lx = Ld · (W2 / W0)

  When the distance Lx based on the expression 3 is converted into the distance Lz from the center P0 in the left-right direction of the vehicle 100, the following expression 4 is obtained.

<< Formula 4 >>
Lz = Lx− (Ld / 2) = Ld · (W2 / W0) − (Ld / 2)

  The distance Lz based on this equation 4 represents the position of the center of gravity G in the left-right direction of the vehicle 100 starting from the center P0 in the left-right direction of the vehicle 100, that is, the amount of eccentricity. For example, when the left-right eccentricity Lz is Lz = 0, the center of gravity G of the vehicle 100 is located at the center P0. When the left-right eccentric amount Lz is Lz <0 (negative number), the center of gravity G of the vehicle 100 is located on the left side of the center P0, that is, in a left-side eccentricity (eccentric load) state. On the contrary, when the left-right eccentric amount Lz is Lz> 0 (positive number), the center of gravity G of the vehicle 100 is located on the right side of the center P0, that is, in a right-side eccentric state.

  The processor 40 obtains the left-right eccentricity Lz of the vehicle 100 based on the equation 4, that is, obtains the position of the center of gravity G. Then, the processor 40 displays the left-right eccentricity Lz of the vehicle 100 based on the equation 4 together with the total weight value W0 of the vehicle 100 based on the above-described equation 1 on a display as a display unit (not shown) included in itself.

  Further, when the vehicle 100 is in a state of being completely placed on the tilt weighing table 30, the processor 40 detects the tilt side analog load detection signal obtained from each of the tilt side load cells 312, 312,. Of the center of gravity G of the vehicle 100 based on the total weight value W0 of the vehicle 100 based on the above formula 1 and the left-right eccentricity Lz based on the formula 4 (strictly speaking, a distance Lx based on the formula 7 described later). Find the height H.

  Specifically, the processor obtains a load value applied to each of the inclined load cells 312, 312,... Based on the inclined analog load detection signal obtained from each of the inclined load cells 312, 312,. Further, by adding the applied load values to the respective slant side load cells 312, 312,..., The total value W3 of the loads applied to all the left wheels 110, 110,. Ask for. In addition, the processor obtains the height H of the center of gravity of the vehicle 100. Refer to FIG.

  FIG. 5 shows the state in which the vehicle 100 is completely placed on the tilt weighing table 30 with attention paid only to the mechanical elements in the left-right direction of the vehicle 100 as in FIG. 4 described above. . In FIG. 5, a point denoted by P3 represents a support position by the inclined load cell group LC3 that is an aggregate of all inclined load cells 312, 312,. This represents a support position by the dummy load cell group LC4 which is an aggregate of the dummy load cells 322, 322,. The point P3 'represents the contact position of the left wheel 110, and the left wheel contact position P3' is directly above the support position point P3 by the inclined load cell group LC3. The point P4 'represents the contact position of the right wheel 120, and this right wheel contact position P4' is directly above the support position P4 by the dummy load cell group LC4. Furthermore, the point P0 'represents the center between the left wheel contact position P3' and the right wheel contact position P4 ', that is, the center of the vehicle 100 in the left-right direction. In addition, the point Pg ′ represents the position of the center of gravity G of the vehicle 100 on the virtual inclined surface 58a passing through the left wheel ground contact position P3 ′ and the right wheel ground contact position P4 ′, and the point Pg ″ represents the tilt side load cell group LC3. Represents the position of the center of gravity G on the virtual horizontal plane 58b passing through the support position P3 by the dummy load cell group LC4 and the support position P4 by the dummy load cell group LC4, and the upward direction labeled W4 with the right wheel ground contact position P4 ′ as a base point. The bold arrows indicate the total applied load to all right wheels 120, 120,..., But all the right wheels 120, 120,... Are supported by the dummy load cell group LC4 (dummy load cells 322, 322,...). The value is not detected.

  In FIG. 5, for example, when attention is paid to the moment about the support position P4 by the dummy load cell group LC4, the following formula 5 is established.

<< Formula 5 >>
Ld · cos θ · W3 = {(Ld−Lx) + H · tan θ} · cos θ · W0

  Then, when the formula 5 is transformed into a formula for the height H, the following formula 6 is obtained.

<< Formula 6 >>
H = {Ld.W3- (Ld-Lx) .W0} / (W0.tan .theta.)

  In addition, the distance Lx in this Formula 6 is calculated | required by the following formula | equation 7 which is a deformation formula of the above-mentioned Formula 4.

<< Formula 7 >>
Lx = Lz + (Ld / 2)

  The processor 40 obtains the height H of the center of gravity G of the vehicle 100 based on Expression 6 including Expression 7. Then, the processor 40 also displays the height H of the center of gravity of the vehicle 100 based on this equation 6 on the above-described display.

  As described above, according to the present embodiment, just by the vehicle 100 passing through the passage 50, the total weight value W0 of the vehicle 100, the left-right eccentric amount Lz indicating the position of the center of gravity G, and the center of gravity height H are obtained. . On the other hand, in the above-described prior art, in order to obtain the height of the center of gravity of the vehicle, it is necessary to change the posture of the vehicle together with the tilting table by the vertical movement mechanism. Therefore, according to the present embodiment, it is possible to obtain the center-of-gravity information including the center-of-gravity height H of the vehicle extremely efficiently as compared with the prior art. Moreover, unlike the prior art, it is not affected by the bending strain, and in particular, it is not affected by the bending strain even when weighing by the tilt weighing table 30. Further, since there is no need to provide a regulating means as in the prior art, there is no inconvenience that the measurement accuracy is lowered due to the provision of the regulating means. Therefore, it is possible to realize weighing with higher accuracy than before, and it is possible to accurately obtain center-of-gravity information including the center-of-gravity height H of the vehicle 100 in particular.

  The contents described in the present embodiment are specific examples for realizing the present invention, and do not limit the scope of the present invention.

  For example, the right-side inclined mounting table 320 constituting the inclined weighing table 30 is supported by the dummy load cells 322, 322,..., But is not limited thereto. That is, as described with reference to FIG. 5, in the present embodiment, when calculating the gravity center information including the gravity center height H, the load applied to the dummy load cells 322, 322,. Since the total value W4 is not required, for example, as shown in FIG. 6, the right inclined mounting table 320 and the dummy load cells 322, 322,... In this case, however, the structure for supporting the left wheels 110, 110,... Of the vehicle 100 is different from the structure for supporting the right wheels 120, 120,. In other words, each left wheel 110, 110,... Of the vehicle 100 is supported by a combination structure of a somewhat elastic element such as a left inclined mounting table 310 and a tiltable element such as an inclined load cell 312, 312,. , Each right wheel 120, 120,... Is placed on the inelastic ground itself called the passage 50. In such a state, the elasticity of the left inclined mounting table 310 that supports the left wheels 110, 110,... And the tilting operation of the inclined load cells 312, 312,. Therefore, the measurement accuracy by the inclined side load cells 312, 312,... Is lowered, and there is a risk of causing an error in the calculation of the center of gravity height H of the vehicle 100. Therefore, in order to realize high-precision weighing, the right-side inclined mounting table 320 and the dummy load cells 422, 422,... Are installed, in short, the left and right wheels 110, 110,. Is desirable to be unified.

  Further, instead of the configuration in which the right inclined mounting table 320 is supported by the dummy load cells 322, 322,..., For example, the left inclined mounting table 310 is supported by the dummy load cell, or the left inclined mounting table 310 and this are supported. The dummy load cell may not be installed. Furthermore, the left horizontal mounting table 210 constituting the horizontal weighing table 20 may be supported by a dummy load cell, or the left horizontal mounting table 210 and the dummy load cell that supports the left horizontal mounting table 210 may be not installed. Alternatively, the right horizontal mounting table 220 may be supported by a dummy load cell, or the right horizontal mounting table 220 and the dummy load cell that supports the right horizontal mounting table 220 may not be installed. That is, it is possible to obtain the center-of-gravity information including the center-of-gravity height H of the vehicle 100 even if any one of the above-described total applied load values W1, W2, W3, and W4 is not detected.

  Further, although not shown in the drawings, the load cells 212, 212,..., 222, 222,..., 312, 312,. Alternatively, a single convex type, that is, a shape in which only one end of the substantially columnar strain generating body protrudes in a substantially hemispherical shape may be employed. However, when the single convex type is adopted, it is natural that the advantages of the double convex type cannot be enjoyed.

  In addition, in the present embodiment, the horizontal weighing platform 20 and the tilt weighing platform 30 are provided, but the present invention is not limited to this. Although not shown in the figure, for example, a first tilt weighing table tilted clockwise by an angle θ ′ with respect to the horizontal direction when viewed from the rear, and a second tilt meter tilted by an angle θ ″ counterclockwise. The tilt angles θ ′ and θ ″ may be equivalent to each other (θ ′ = θ ″) or non-equivalent (θ ′ ≠ θ ″). Also good.

  For the horizontal weighing platform 20, the left wheels 110, 110,... Of the vehicle 100 are mounted on the left horizontal mounting tables 210, 210,. .., 210,... Different from the right horizontal mounting table 220, 220,. In other words, the left and right wheels 110, 110, ... and 120, 120, ... of the vehicle 100 may be placed on a common horizontal mounting table. In this case, each of the left and right side edges of the horizontal mounting table is supported by a plurality of load cells. Similarly, the tilt weighing platform 30 may be configured such that the left and right wheels 110, 110,... And 120, 120,.

  Further, for each of the horizontal weighing platform 20 and the inclined weighing platform 30, only one of the wheels 110, 110,... And 120, 120,. May be. That is, a so-called wheel load meter that measures the load applied to each of the left wheel 110 and the right wheel 120 for one axis, or a load that is comprehensively applied to both the left and right wheels 110 and 120 for the one axis. The present invention may also be applied to a so-called axle weight meter. Of course, the present invention can also be applied to a device that measures wheel load values or axle load values for an arbitrary number of axes.

  Further, although the center of gravity position (left-right eccentricity Lz) in the left-right direction of the vehicle 100 is obtained as the position of the center of gravity G of the vehicle 100, the center of gravity position in the front-rear direction of the vehicle 100 may be obtained. In this case, when the vehicle 100 is placed on the horizontal weighing platform 20, the vehicle 100 takes a horizontal posture and is applied to the front wheel and the rear wheel of the vehicle 100 that takes the horizontal posture. Configured to be measured. Based on the front wheel applied load value and the rear wheel applied load value in the horizontal posture, the position of the center of gravity of the vehicle 100 in the front-rear direction is obtained. At the same time, the total weight W0 of the vehicle 100 is also obtained.

  Further, when the center of gravity position in the front-rear direction of the vehicle 100 is obtained in this way, when the vehicle 100 is placed on the tilt weighing platform 30, the vehicle 100 is moved in the front-rear direction (that is, the vehicle 100). The load applied to the front wheels of the vehicle 100 and the load applied to the rear wheels are inclined at a predetermined angle (acute angle) with respect to the horizontal direction (when 100 is viewed from the side). Are configured to be weighed. Then, the center of gravity height H of the vehicle 100 is obtained based on the applied load value of the front wheel or the rear wheel in the inclined posture, the total weight value W0 of the vehicle 100 obtained previously and the center of gravity position in the front-rear direction. May be.

DESCRIPTION OF SYMBOLS 10 Vehicle weighing system 20 Horizontal weighing platform 30 Inclined weighing platform 40 Processor 50 Roadway 100 Vehicle 210 Left horizontal loading table 212 Left load cell 220 Right horizontal loading table 222 Right load cell 410 Left inclined gravel table 412 Inclined load cell 420 Right inclined loading table 422 Dummy load cell

Claims (2)

A vehicle weighing platform used in a vehicle weighing device having a function of obtaining center of gravity information including the height of the center of gravity of a vehicle,
A mounting table having a structure in which all or a part of the wheels belonging to the vehicle are mounted and the vehicle is inclined when the all or a part of the wheels are mounted;
Supporting the mounting table in a state of being sandwiched between the mounting table and a base part below the mounting table, and detecting a load applied via the mounting table to provide calculation of the center of gravity information. A plurality of load detection means;
Comprising
Each of the plurality of load detection means is in a posture for detecting a force in the vertical direction,
Each joint portion between the mounting table and the plurality of load detecting means is on the same horizontal plane,
Each joint part of the foundation and the plurality of load detecting means is also on the same horizontal plane,
Vehicle weighing platform. Each of the plurality of load detecting means is a double convex type load cell having a substantially columnar strain body formed so that both ends protrude in a substantially hemispherical shape, and one end of the strain body is placed on the mounting table described above The strain body is in an upright posture so that the other end of the strain body is brought into contact with the base portion.
The vehicle weighing platform according to claim 1.

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