JP5764403B2 - Low floor scale - Google Patents

Description

  The present invention relates to a low floor platform scale in which the height of a weighing pan is set to be low so that an object to be weighed can be easily placed on the weighing pan, and a reduction in accuracy due to an impact can be avoided.

The following Patent Document 1 discloses a low-floor platform scale previously developed by the present inventors.
As shown in FIG. 12, this low floor platform scale is spanned between an upper frame 10 that supports a flat weighing pan (not shown), two parallel base frames 20, 20, and the base frames 20, 20. A weight sensor unit 30. As shown in FIG. 13, a weight sensor 40 including a tuning fork vibrator 41 and a block body 42 that reduces the applied load and transmits the applied load to the tuning fork vibrator 41 is housed in the sensor case 33 of the weight sensor unit 30. In the block body 42, a block mechanism is cut to form a Robert mechanism or a lever mechanism.

The fixed side of the block body 42 is fixed to the bottom of the sensor case 33 with a bolt 43, and the load of the object to be measured is transmitted to the movable side of the block body 42 through the bolt 37. The tip of the bolt 37 is mechanically coupled to the upper surface support member 31 (FIG. 12) that supports the upper frame 10, and the load applied to the upper frame 10 is the upper surface of the two weight sensor units 30 that are in contact with the upper frame 10. The signal is transmitted to the support member 31, transmitted from the upper surface support member 31 to the bolt 37 supporting the upper surface support member 31, and the movable side of the block body 42 of the weight sensor 40 is displaced by the load applied to the bolt 37, and a signal corresponding to the displacement Is output from the tuning fork vibrator 41.
In addition, a component buffering device 32 for preventing a decrease in detection accuracy due to the bending of the upper frame 10 is installed on the surface of the upper surface support member 31 that supports the upper frame 10.

International Publication WO2011 / 001877

In production sites where heavy materials such as chemical raw materials are weighed, there are strong demands for further lowering the floor scale and higher accuracy of the platform scale.
2. Description of the Related Art As a structure of a weighing pan for a platform scale for reducing the floor, there is known a structure in which a placement surface on which an object to be weighed is placed one step lower than the other parts of the weighing pan. If this low-floor structure is adopted, for example, a heavy object to be weighed is placed on a carriage and the like, and the carriage moves on the placement surface through a slope installed so as to guide it to the placement surface. The weight of the object to be weighed can be calculated by subtracting the carriage from the measured value. As a result, the load measurement operation of a heavy object to be weighed becomes easy.
However, in such a case, an event may be assumed in which a cart loaded with a heavy object falls from the placement surface or collides with a weighing pan and gives a large impact to the platform scale. Such an event may threaten the safety of the operator and impair the weighing accuracy of the platform scale.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a low-bed scale that can ensure safety and avoid deterioration in accuracy due to impact.

In the present invention, the weighing pan has a placement surface on which the object to be weighed is placed, and a box-shaped covering portion that covers the weight sensor unit on both sides of the placement surface, and the placement surface is a box-shaped covering portion. A low-floor platform scale set lower than the top surface, which measures the load on the weighing object placed on the weighing plate's loading surface, and the weighing object's overload from the loading surface And a protection mechanism that regulates the run, and the weighing unit body has a weighing pan and a protruding portion that abuts the inside of the box-shaped covering portion of the weighing plate, and the weight that supports the weighing pan by this protruding portion A sensor unit, and a floor surface base that supports the weight sensor unit at a position close to the floor surface, wherein the floor surface base supports the weight sensor unit and a pair of sensor mounting frames from the floor surface of the sensor mounting frame. Height adjustment screw with one end in contact with the floor to adjust the height Has a screw hole height adjusting screw is screwed, and a height adjustment plate to vary the height from the floor surface of the sensor mounting frame in accordance with the rotation of the height adjusting screw, the protection mechanism, A stopper mounting member that includes a stopper that suppresses overrun of the object to be weighed at a position that does not contact the weighing unit main body behind the placement surface, and a stopper mounting member that attaches the stopper to the floor surface base . It is attached to the height adjustment plate of the floor base directly or via a connecting member .
In this low floor scale, the stopper mounting member that supports the stopper is attached to the floor base located close to the floor surface via the height adjustment plate of the floor base. Almost no pan or weight sensor unit.

In the low-floor platform scale of the present invention, the stopper mounting member includes a stopper support that supports the stopper, and a stopper mounting frame that is coupled to the stopper support and is attached to the floor base.
As described above, the stopper is attached to the floor base via the stopper support and the stopper mounting frame.

Further, in the low floor platform scale of the present invention, the height adjusting screw and the height adjusting plate are arranged at the front end and the rear end of the sensor mounting frame, and the stopper mounting frame extending in parallel with the sensor mounting frame is provided on the sensor mounting frame. It is attached to the height adjustment plate at the positions of the front end and the rear end.
Therefore, the stopper mounting frame is stably fixed, and the stopper mounting is stabilized.

Further, in the low-floor platform scale of the present invention, the sensor mounting frame has a mounting surface for mounting the weight sensor unit, and an upright portion formed by bending both side edges of the mounting surface upward, A first contact that abuts the inner surface of the box-shaped covering portion on the outer surface when the contact position of the protruding portion of the weight sensor unit and the box-shaped covering portion of the weighing pan deviates in a direction perpendicular to the extending direction of the sensor mounting frame. Has a tangent.
Therefore, even when the weighing pan that has received an impact is displaced in a direction perpendicular to the extending direction of the sensor mounting frame, the weighing pan hits the sensor mounting frame and does not hit the delicate weight sensor unit.

In addition, the height adjustment plate of the low-floor platform scale according to the present invention includes a box-shaped covering portion when the contact position between the protruding portion of the weight sensor unit and the box-shaped covering portion of the weighing pan is shifted in the extending direction of the sensor mounting frame. A second abutting portion that abuts on the inner surface of the second abutting portion.
Therefore, even when the weighing pan that has received an impact is displaced in the extending direction of the sensor mounting frame, the weighing pan hits the height adjustment plate and does not hit the delicate weight sensor unit or the sensor mounting frame that supports it.

The low-floor platform scale of the present invention can prevent an accident that an object to be weighed falls from the placement surface of the weighing pan without lowering the weighing accuracy.
In addition, since the impact received by the weighing pan is not directly applied to the weight sensor, high accuracy can be maintained even if the weighing pan receives the impact.

The perspective view of the low floor platform scale which concerns on embodiment of this invention The perspective view which shows the measurement part main body of the low floor platform scale of FIG. 2 is an exploded perspective view of the measuring unit main body of FIG. Partial enlarged view of the floor base of the weighing unit The perspective view which shows the weight sensor unit of FIG. The figure which shows the relationship between the sensor mounting frame, weight sensor unit, and box-shaped coating | coated part of the measurement part main body of FIG. The perspective view which shows the protection mechanism couple | bonded with the floor surface base of the low floor platform scale of FIG. FIG. 7 is an exploded perspective view of the floor base and the protection mechanism of FIG. FIG. 7 is a plan view of the floor base and the protection mechanism. FIG. 9 is an exploded plan view of the floor base and the protection mechanism. FIG. 7 is an exploded front view of the floor base and the protection mechanism. A diagram showing a conventional low-floor platform scale An exploded perspective view of a weight sensor unit used in a conventional low-floor platform scale

FIG. 1 shows the overall shape of a low-floor platform scale according to an embodiment of the present invention.
This platform scale includes a measuring unit main body for measuring an object to be weighed placed on the placing surface 101 of the weighing pan 100, and a protection mechanism including a stopper 160 and stopper mounting members (161, 162).

  As shown in the perspective view of FIG. 2, the exploded perspective view of FIG. 3, and the partially enlarged view of FIG. 4, the weighing unit main body has a weight sensor unit 120 and a placement surface 101 on which an object to be weighed is placed. And a weighing pan 100 having a box-shaped covering portion 102 that covers the weight sensor unit 120 on both sides of the mounting surface 101, and a floor base that supports the weight sensor unit 120 at a position close to the floor surface. The floor base adjusts the height of the sensor mounting frame 130 from the floor surface, the pair of sensor mounting frames 130 to which the weight sensor unit 120 is fixed, the pair of connection frames 131 connecting the sensor mounting frames 130. A height adjustment screw 170 and a screw hole into which the height adjustment screw 170 is screwed, and a height adjustment plate 171 that changes the height from the floor surface according to the rotation of the height adjustment screw 170 (FIG. 4). It is composed of a.

The mounting surface 101 of the weighing pan 100 is integrated with the box-shaped covering portion 102 so as to be one step lower than the top surface of the box-shaped covering portion 102. In addition, you may comprise the weighing pan 100 provided with the mounting surface 101 and the box-shaped coating | coated part 102 by shape | molding one board.
In addition, a handle 103 used for setting or removing the weighing pan 100 is fixed to the side surface of the box-shaped covering portion 102.
Two weight sensor units 120 are attached to one sensor mounting frame 130, and a total of four weight sensor units 120 are fixed at positions that form a rectangular shape.

  As shown in FIG. 5, the weight sensor unit 120 includes a sensor case 121 containing a weight sensor similar to that described in Patent Document 1, a lid plate 122 that closes the opening of the sensor case 121, and a weighing pan. In order to transmit the load applied to 100 to the movable part of the weight sensor, four bolts 123 led out of the sensor case 121 through the cover plate 122, and a fixed plate 124 mechanically coupled to the bolt 123 A component force buffer unit 140 fixed to the fixed plate 124, and a boss 150 having a truncated cone-shaped top fixed to the upper plate of the component force buffer unit 140.

FIG. 6 shows the relationship among the sensor mounting frame 130, the weight sensor unit 120, and the box-shaped covering portion 102. The boss 150 of the weight sensor unit 120 supports the weighing pan 100 by abutting against a receiving member 152 fixed inside the box-shaped covering portion 102 of the weighing pan 100. The receiving member 152 is formed with a bowl-shaped recess 153, and the tip of the boss 150 is engaged with the bowl-shaped recess 153 so that the weighing pan 100 is positioned with respect to the boss 150.
The component force buffer unit 140 serves to release the horizontal stress caused by the deflection of the weighing pan 100, and a heavy object is placed on the placement surface 101 of the weighing pan 100, and the weighing pan 100 is bent. Even in this case, the component force buffer unit 140 can perform high-precision weighing.

The height adjustment screws 170 are arranged at the positions of the front end and the rear end of each sensor mounting frame 130. As shown in FIG. 4, the height adjustment plate 171 to which the height adjustment screws 170 are screwed is provided. A sensor mounting frame 130 and a connection frame 131 are coupled.
Further, a connecting member 172 for attaching a stopper mounting frame 162 described later is coupled to the height adjusting plate 171.

  The sensor mounting frame 130 to which the weight sensor unit 120 is fixed has a mounting surface 173 of the weight sensor unit 120 and standing parts 174 formed by bending both side edges of the mounting surface 173 upward. A bolt 175 is attached to the outer surface of the upright portion 174. The bolt 175 has a box-shaped covering when the engagement between the boss 150 and the bowl-shaped recess 153 is disengaged and the weighing pan 100 is displaced in the extending direction of the connection frame 131 (the direction orthogonal to the extending direction of the sensor mounting frame 130). It plays the role of the 1st contact part contact | abutted to the inner surface (side surface along a longitudinal direction) of the part 102. FIG.

  A bolt 176 is attached to the outer surface of the height adjustment plate 171 orthogonal to the extending direction of the sensor attachment frame 130. The bolt 176 is disengaged between the boss 150 and the bowl-shaped recess 153, and the inner surface (side surface orthogonal to the longitudinal direction) of the box-shaped covering portion 102 when the weighing pan 100 is displaced in the extending direction of the sensor mounting frame 130. It plays the role of the 2nd contact part which contact | abuts.

FIG. 7 is a perspective view showing a protection mechanism attached to the floor base of the measuring unit main body, and FIG. 8 shows an exploded state thereof. 9 and 10 are plan views corresponding to FIGS. 7 and 8. FIG. 11 shows a front view.
The protection mechanism includes a stopper 160 that suppresses overrun of the object to be weighed, and a stopper mounting member that attaches the stopper 160 to the floor base. The stopper mounting member supports a stopper support 161 that supports the stopper 160, and a stopper support. The stopper mounting frame 162 is fixed to the body 161 and assembled to the floor base.

The stopper 160 is disposed at a position that does not contact the measuring unit main body behind the placement surface 101, and both ends of the stopper 160 are fixed with screws along the vertical sides of the triangular stopper support 161.
The bottom side of the stopper support 161 is fixed to the stopper mounting frame 162 arranged in parallel with the sensor mounting frame 130 with screws.
The stopper mounting frame 162 is coupled to a connecting member 172 fixed to the height adjustment plate 171.

In this way, the weighing unit main body and the protection mechanism are combined, and the low floor platform scale shown in FIG. 1 is completed. 1, the stopper 177 for preventing the lifting of the weighing pan 100 is fixed to the stopper mounting frame 162.
Since this low-floor platform scale is provided with a stopper 160 that suppresses overrun, even when the trolley loaded with an object to be weighed is placed on the placement surface 101, an accident that overruns and falls from the placement surface 101 is prevented. it can.

  At this time, when the carriage hits the stopper 160, the impact is transmitted to the height adjustment plate 171 integrated with the height adjustment screw 170 via the stopper support 161 and the stopper mounting frame 162. However, one end of the height adjusting screw 170 is substantially fixed in contact with the floor surface, and the position of the height adjusting plate 171 to which the impact is transmitted is close to the fixing point. The influence which 120 and the weighing pan 100 receive is slight.

  Even if the carriage collides with the weighing pan 100 and the impact causes the boss 150 of the weight sensor unit 120 and the bowl-shaped recess 153 of the receiving member 152 to be disengaged and the weighing pan 100 is displaced, the direction of the displacement Is the direction perpendicular to the extending direction of the sensor mounting frame 130, the bolt 175 as the first contact portion hits the inner surface of the box-shaped covering portion 102, and the direction of displacement is the extending direction of the sensor mounting frame 130, Since the bolt 176 that is the second contact portion hits the inner surface of the box-shaped covering portion 102, a direct collision between the weight sensor unit 120 and the weighing pan 100 can be avoided, and the accuracy of the weight sensor can be maintained.

  Here, the case where the stopper mounting frame 162 is coupled to the height adjustment plate 171 via the connecting member 172 has been described. However, the stopper mounting frame 162 may be coupled directly to the height adjustment plate 171. .

  The low-floor platform scale of the present invention is easy to weigh heavy objects and has high safety. Therefore, it can be widely used in manufacturing factories, distribution facilities, transportation facilities, etc. that require weighing heavy objects. .

DESCRIPTION OF SYMBOLS 100 Weighing pan 101 Placement surface 102 Box-shaped covering part 103 Handle 120 Weight sensor unit 121 Sensor case 122 Cover plate 123 Bolt 124 Fixing plate 130 Sensor mounting frame 131 Connection frame 140 Component buffer unit 150 Boss 152 Receiving member 153 Bowl-shaped recess 160 Stopper 161 Stopper support 162 Stopper mounting frame 170 Height adjusting screw 171 Height adjusting plate 172 Connecting member 173 Weight sensor unit mounting surface 174 Standing portion 175 Bolt (first contact portion)
176 bolts (second contact part)
177 Lifting prevention stopper

Claims (5)

The weighing pan has a placement surface on which an object to be weighed is placed, and a box-shaped covering portion that covers the weight sensor unit on both sides of the placement surface, and the placement surface is the top of the box-shaped covering portion. A low floor platform scale set lower than the surface,
A measuring unit main body for measuring the load of the object to be weighed placed on the placing surface of the weighing pan;
A protective mechanism that regulates the overrun of the object to be weighed from the placement surface,
Have
The measuring unit body is
The weighing pan;
The weight sensor unit having a protrusion abutting on the inside of the box-shaped covering portion of the weighing pan, and supporting the weighing dish by the protrusion;
A floor base that supports the weight sensor unit at a position close to the floor;
With
The floor base is
A pair of sensor mounting frames that support the weight sensor unit;
A height adjusting screw having one end in contact with the floor in order to adjust the height from the floor of the sensor mounting frame;
A height adjustment plate having a screw hole into which the height adjustment screw is screwed, and changing a height from the floor surface of the sensor mounting frame according to rotation of the height adjustment screw;
With
The protection mechanism is
A stopper that suppresses overrun of the object to be weighed at a position that does not contact the main body of the weighing unit behind the placement surface;
A stopper mounting member for mounting the stopper to the floor base;
Equipped with a,
The low floor platform scale , wherein the stopper mounting member coupled to the stopper is mounted directly or via a connecting member on the height adjustment plate of the floor surface base . The low-floor platform scale according to claim 1 , wherein the stopper mounting member includes a stopper support that supports the stopper, and a stopper mounting frame that is coupled to the stopper support and is attached to the floor surface base. A low-floor platform scale. 3. The low floor platform scale according to claim 2 , wherein the height adjusting screw and the height adjusting plate are arranged at a front end and a rear end of the sensor mounting frame and extend in parallel to the sensor mounting frame. A low floor platform scale, wherein a frame is attached to the height adjustment plate at positions of a front end and a rear end of the sensor mounting frame. A low-floor platform scale according to any one of claims 1 to 3, wherein the sensor mounting frame, said a mounting surface for mounting a weight sensor unit, the standing part of both side edges of the attachment surface is formed bent upward The upright portion has an outer surface on which an abutting position between the protruding portion of the weight sensor unit and the box-shaped covering portion of the weighing pan is shifted in a direction perpendicular to the extending direction of the sensor mounting frame. A low-floor platform scale characterized by having a first abutting portion that abuts against the inner surface of the box-shaped covering portion. A low-floor platform scale according to any one of claims 1 to 4, wherein the height adjustment plate, the contact position is the sensor mounting of the box-like covering portions of the pan and the projecting portion of the weight sensor unit A low-floor platform scale comprising a second abutting portion that abuts against the inner surface of the box-shaped covering portion when shifted in the extending direction of the frame.