JP6180676B1 - Weighing device - Google Patents

Abstract

An object of the present invention is to prevent contamination in a weighing chamber. A measuring device includes a casing and partition walls that partition an internal space of the casing into a measuring chamber and mechanism chambers. The measuring chamber 4 is suspended in the measuring chamber 4 and temporarily stores the object P to be measured 4, the supply valve 31 for adjusting the supply amount of the object P to be measured into the measuring tube 4, and the above Openable and closable floor plates 51A and 51B provided immediately below the measuring cylinder 4 are provided. A mass measuring device 43 for measuring the mass of the object P to be measured and a supply valve for controlling the supply valve 31 are provided in the mechanism chamber 15. A driving device 35 and a floor plate opening / closing driving device 54 for opening and closing the floor plates 51A and 51B are provided. [Selection] Figure 4

Description

  The present invention relates to a measuring device, and more particularly to a measuring device for measuring (measuring) the mass of granular materials and powdered materials, for example, resin pellets, rice, sugar, and feed, which are subdivided into predetermined amounts.

  In order to accurately bag or take out a granular or powdered material for a blending process, the mass of the granular or powdered material to be bagged or removed must be measured in advance. Since the granular material or the powdery material is fine, the granular material or the powdery material is stored in the measuring container for measurement, and the mass including the measuring container is measured. A suspension scale (load cell) is generally used for measuring the mass including the measuring container. In order to suspend a weighing container with a suspension scale, a suspension member is generally fixed to the measurement container, and a suspension scale is connected to the suspension member (Patent Document 1).

  When the granular or powder to be weighed is replaced and another type of granular or powder is weighed, the measuring container is generally cleaned or washed every corner. Of course, regular cleaning or washing is performed even when only the same type of granular or powdery material is weighed. In addition, in a measuring device that stores a measuring container in a room (measuring chamber), the measuring chamber is also cleaned or washed to every corner. This is an important work to prevent the granular material or powder before measurement to be mixed into the granular material or powder to be weighed (preventing contamination). For the type in which a suspension scale is connected to a suspension member fixed to the weighing container, the suspension scale must be removed each time the weighing container (measuring chamber) is cleaned or washed, and the balance when the suspension scale is attached again. Confirmation work (calibration work) is also required. In addition, in a type of measuring device that stores a measuring container in a measuring chamber, it takes time to remove the measuring container from the measuring chamber.

International Publication WO2014 / 083588

  An object of the present invention is to facilitate the cleaning and washing of the measuring container and the measuring chamber, and to prevent the contamination (contamination) of substances that should not be mixed.

  Another object of the present invention is to achieve the prevention of contamination by preventing an object to be weighed in the measuring chamber from flowing into the mechanism chamber and conversely preventing a foreign matter in the mechanism chamber from flowing into the measuring chamber. .

  The weighing device according to the present invention includes a casing and a partition that partitions the internal space of the casing into a measuring chamber and a mechanism chamber, and is suspended in the measuring chamber, and is to be weighed, typically a granular material or a powder. A measuring cylinder with an open top and bottom for temporarily storing the objects, a supply valve for adjusting the supply amount of the object to be weighed into the measuring cylinder, and an openable / closable floor plate provided directly below the measuring cylinder A mass measuring instrument for measuring the mass of an object to be weighed stored in the measuring cylinder, a supply valve driving device for controlling the supply valve, and a floor plate opening / closing driving device for opening and closing the floor plate, It is provided in the mechanism chamber.

  According to the present invention, the object to be weighed is temporarily stored in the space surrounded by the measuring tube suspended in the measuring chamber and the openable / closable floor plate directly below the measuring tube. The measuring cylinder is open at the top and bottom, and the object to be weighed is supplied into the measuring cylinder from the upper opening. The supply amount of the object to be weighed into the measuring cylinder is controlled by the supply valve controlled by the supply valve driving device. Preferably, by feeding back the measurement result of the mass measuring instrument that measures the mass of the object to be weighed, the supply amount of the object to be weighed into the measuring cylinder using the supply valve is adjusted, and a predetermined amount of the object to be weighed is It is stored in a measuring tube. An openable / closable floor plate is provided directly below the measuring tube, so that the object to be weighed does not fall from the lower opening of the measuring tube when the floor plate is closed. When the weighing of the object to be weighed is completed, the floor board is opened by the floor board opening / closing drive device, and a predetermined amount of the object to be weighed falls from the lower opening of the measuring tube and is discharged from the weighing device (measuring chamber).

  The measuring cylinder provided in the measuring device according to the present invention does not have a driving portion and is not attached with a driving shaft. Also, a mass measuring instrument that measures the mass (weight) of an object to be weighed, typically a load cell, is not directly fixed to the measuring cylinder. The measuring cylinder provided in the measuring device according to the present invention can be carried out of the measuring chamber without removing the mass measuring instrument. In addition, since there is no drive part as described above, it is very easy to carry the measuring cylinder out of the measuring chamber. Since the measuring tube occupies a relatively large space in the measuring chamber, it is easier to clean or wash the measuring chamber by carrying the measuring tube out and prevent contamination. Needless to say, it is easy to clean or wash the measuring tube carried outside. Since the measuring instrument and the driving device are provided in the mechanism chamber partitioned by the partition wall, the measuring chamber can be washed with water.

  In one embodiment, the housing includes first and second partition walls that partition the internal space of the housing into the weighing chamber and first and second mechanism chambers on both sides of the weighing chamber. The first and second receiving shafts are configured by first and second divided floor plates arranged in the front-rear direction, and suspend the measuring tube on both front and rear wall surfaces of the measuring tube. The bearing shaft through holes formed in the first and second partition walls are non-contacted and extend to the first and second mechanism chambers, and are connected to the first and second divided floor plates, respectively. The first and second drive shafts pass through the floor plate drive shaft through holes formed in the first and second partition walls in a non-contact manner and extend to the first and second mechanism chambers. In one mechanism chamber, one end of the first and second receiving shafts and one end of the first and second drive shafts are fixed to the first suspension member. And the other end of the first and second receiving shafts and the other end of the first and second drive shafts are fixed to the second suspension member in the second mechanism chamber, The first and second suspension members are respectively suspended by the mass measuring instrument. Since the mass measuring instrument is not directly fixed to the first and second receiving shafts that suspend the measuring tube, the first and second receiving shafts can be removed without removing the mass measuring instrument. By removing at least one of the first and second receiving shafts, the measuring tube can be easily carried out of the measuring chamber.

  Preferably, both end portions of the first and second receiving shafts are fixed to the first and second suspension members by detachable split members, respectively. Both ends of the first and second receiving shafts can be firmly fixed to the first and second suspension members by the cleaving member. If the split member is removed, the first and second receiving shafts can be easily removed, and the measuring tube can be carried out of the measuring chamber. The time required to start cleaning or cleaning the measuring cylinder and the measuring chamber and the time required for reassembly after cleaning or cleaning can be greatly reduced.

  In a preferred embodiment, no bolts are used in the weighing chamber. It is possible to effectively prevent the bolt from dropping due to vibration or the like in the measuring chamber.

  In a more preferred embodiment, gas is directed to the receiving shaft through hole and the floor plate drive shaft through hole around the first and second mechanism chambers of the receiving shaft through hole and the floor plate drive shaft through hole, and A gas injection mechanism that injects toward each of the measurement chamber and the first and second mechanism chambers is provided. Effectively prevents both the inflow of foreign matter into the measuring chamber and the inflow of dust (typically powdery objects to be measured) into the mechanism chamber through the receiving shaft through hole and the floor plate driving shaft through hole. be able to. Air, nitrogen gas or the like is used as the gas.

  For example, the gas injection mechanism includes a plurality of annular channels that provide a channel through which the gas to be fed flows, and a plurality of injection ports that face the annular channel and the receiving shaft through hole and the floor plate drive shaft through hole. Each of the branch channels is divided into at least two branches in the middle, at least one of the divided channels is directed to the measuring chamber, and at least one of the other channels is the first and second channels. Inclined toward the mechanism room.

  Preferably, the gas injection mechanism includes an injection amount control device that increases an injection amount of the gas when the first and second divided floor plates are opened by the floor plate opening / closing drive device. It is possible to effectively prevent foreign matter from entering through the through hole.

It is the perspective view which looked at the measuring device from the front. It is the perspective view which looked at the weighing device from the back. It is a perspective view which shows the measurement apparatus of the state which removed the measurement cylinder. It is a front view of a weighing device. It is a left view of a weighing device. It is a right view of a weighing device. It is an expanded sectional view which follows the VII-VII line of FIG. It is a disassembled perspective view which shows the receiving shaft which suspends a measuring cylinder and a measuring cylinder. FIG. 7 is an enlarged end view taken along line IX-IX in FIG. 6.

  1 to 6, the weighing device 1 includes a metal housing 11, and a plurality of mechanisms for measuring (measuring) the mass of an object to be weighed in the internal space of the housing 11 or The member is stored. A mechanism or member housed in the internal space of the housing 11 is fixed, supported, or suspended directly or via a fixing member fixed to the housing 11. In order to show the inside of the housing | casing 11, the state which removed all the doors is shown by FIGS. When weighing the weight of an object to be weighed using the weighing device 1, all doors are generally closed to prevent the object from being scattered and to ensure the safety of workers.

  An opening 21 is formed on the top surface of the housing 11, and an opening 22 is formed on the bottom surface. The object P is inserted into the weighing device 1 from the upper opening 21 of the housing 11, and the weighing by the weighing device 1 is finished. The measured object P falls downward from the lower opening 22 by a certain amount. A bagging device (not shown) is generally installed below the weighing device 1, and the object P to be weighed that has dropped from the lower opening 22 is packed in the bagging device. The weighing device 1 is used for weighing various granular materials or powdery materials, and can measure a wide variety of objects to be weighed by changing the type of objects to be weighed.

  The outer shape of the housing 11 is a rectangular parallelepiped shape, and the internal space is also a rectangular parallelepiped shape. The internal space of the housing 11 is partitioned into three internal spaces by two partition walls 12L and 12R that are provided at intervals in the left-right direction of the housing 11 and extend in the front-rear direction of the housing 11. Hereinafter, of the three internal spaces, the central internal space is referred to as the weighing chamber 14, and the internal spaces located on the left and right sides of the weighing chamber 14 with the partition walls 12L and 12R being separated from the first mechanical chamber 15 and the first This is called two mechanism chamber 16.

  1 to 4, the measuring chamber 14 is provided with a cylindrical hopper 2, a supply valve mechanism 3, a measuring cylinder 4 and a floor plate opening / closing mechanism 5 in order from the top.

  The cylindrical hopper 2 has a cylindrical shape with an upper and lower opening, and the upper opening of the cylindrical hopper 2 is connected to the opening 21 of the housing 11. The cylindrical hopper 2 is fixed to the inner surface of the top surface of the housing 11, for example.

  An object to be weighed P is put into the cylindrical hopper 2 from the opening 21 of the housing 11. At this time, the lower opening of the cylindrical hopper 2 is closed by the supply valve mechanism 3. Referring to FIG. 4, the supply valve mechanism 3 includes a supply valve 31 having an arcuate cross section disposed immediately below the lower opening of the cylindrical hopper 2, and a cantilever plate 32 connected to one side of the supply valve 31 and extending upward. And a supply valve drive shaft 33 extending to the first mechanism chamber 15 through a through hole 8 having one end fixed to the upper end portion of the cantilever side plate 32 and the other end opened in the partition wall 12L. Referring to FIG. 7, the diameter of the supply valve drive shaft 33 is slightly smaller than or substantially the same as the diameter of the through-hole 8, and the first mechanism chamber 15 of the partition wall 12L is surrounded by the periphery of the through-hole 8 on the wall surface. A bush or the like (not shown) is attached to. There is no or almost no air flow between the measuring chamber 14 and the first mechanism chamber 15 through the through hole 8.

  4 and 5, the first mechanism chamber 15 is provided with a potentiometer 34 and a motor 35 with a speed reducer. The other end of the supply valve drive shaft 33 is connected to the rotation shaft of the motor 35, and the rotational force of the motor 35 is transmitted to the supply valve drive shaft 33. The rotary shaft of the potentiometer 34 and the supply valve drive shaft 33 are connected by a belt 36, and the current position of the supply valve drive shaft 33 is measured by the potentiometer 34. For example, a servo motor is used as the motor 35, and the supply valve drive shaft 33 can be rotated forward and backward within a predetermined angle range, and the stop position can be maintained. Instead of the motor 35, the supply valve drive shaft 33 may be rotated by an air cylinder.

  When the supply valve drive shaft 33 rotates, the supply valve 31 having an arc cross section rotates about the supply valve drive shaft 33. The lower opening of the cylindrical hopper 2 closed by the supply valve 31 is opened, and the object P to be weighed in the cylindrical hopper 2 by the supply valve 31 falls from the lower opening of the cylindrical hopper 2. By controlling the rotation angle of the supply valve drive shaft 33, the degree of closing (opening degree) of the lower opening of the cylindrical hopper 2 by the supply valve 31 is controlled, and the amount of fall of the object P to be measured (falling per unit time) The amount of the object P to be weighed) is adjusted. Preferably, the degree of closing of the lower opening of the cylindrical hopper 2 by the supply valve 31 is controlled by feedback control in accordance with a measured value of the mass of the object P to be described later. When the measured value reaches the set value, the lower opening of the cylindrical hopper 2 is closed again by the supply valve 31.

  A measuring tube 4 is provided directly below the supply valve 31. FIG. 8 shows an enlarged perspective view of the measuring tube 4.

  The measuring tube 4 is a rectangular tube having an open top and bottom, and a triangular prism-shaped suspension fitting 4a is fixed laterally on the front outer surface and the rear outer surface. The measuring tube 4 is suspended in the measuring chamber 14 by the two suspension fittings 4a being hung on measuring tube receiving shafts 6A and 6B described below. By making the suspension fitting 4a into a triangular prism shape, it is possible to make it difficult to deposit an object to be weighed on the suspension fitting 4a.

  The measuring tube receiving shafts 6A and 6B have a central portion formed in a square column shape and both end portions formed in a columnar shape. The bottom surface of the hanging metal fitting 4a is placed on the upper surface of the quadrangular columnar portion 6a. Small claw portions 6b are formed to protrude outward at both ends of the upper surface of the quadrangular columnar portion 6a of the receiving shafts 6A and 6B. On the other hand, a protruding portion 4b that protrudes slightly outward is formed in the longitudinal direction on the bottom surface side of each hanging metal fitting 4a on the front outer surface and rear outer surface of the measuring tube 4, and the bottom surface and the protrusion of the hanging metal fitting 4a A groove 4c is formed between the portion 4b. The claw portion 6b is fitted into the groove portion 4c, whereby the measuring tube 4 can be reliably hooked on the shafts 6A and 6B.

  4 and 7, the receiving shafts 6A and 6B extend through the through holes 7A and 7B formed in the partition wall 12L to the first mechanism chamber 15, and the other end is opened in the partition wall 12R. The second mechanism chamber 16 extends through the through holes 7A, 7B. The cross-sectional diameters of both end portions of the receiving shafts 6A and 6B are smaller than the diameters of the through holes 7A and 7B, and the receiving shafts 6A and 6B are passed through the through holes 7A and 7B in a non-contact manner.

  Both end portions of the receiving shafts 6A and 6B are supported by frame bodies 80 provided in the first and second mechanism chambers 15 and 16, respectively. Referring to FIGS. 5 and 6, the frame body 80 includes a first frame member 81 and a second frame member 82 fixed to the upper frame portion of the first frame member 81 by bolts. Both end portions of the receiving shafts 6A and 6B are passed through the holes formed in the holes. A split fastening member 82a is detachably fixed to both upper ends of the second frame member 82 provided in the first and second mechanism chambers 15 and 16, and both end portions of the receiving shafts 6A and 6B are fixed by the split fastening member 82a. Is firmly fixed to the frame body 80 (second frame member 82). By removing (or loosening) the cleaving member 82a, the receiving shafts 6A and 6B can be slid in the lateral direction (direction of the second mechanism chamber 16), and the receiving shafts 6A and 6B can be easily removed. It is configured.

  When the workpiece P is weighed, the lower opening of the measuring tube 4 is closed by the floor plate opening / closing mechanism 5. Referring to FIG. 3, floor plate opening / closing mechanism 5 includes divided floor plates 51A and 51B arranged in the front-rear direction immediately below the lower opening of measuring cylinder 4, the front end portion of divided floor plate 51A, and the rear end of divided floor plate 51B. Divided floor plate drive shafts 52A and 52B, which are fixed to the respective portions and extend in the left-right direction, are provided. 4 and 7, split floor plate drive shafts 52A and 52B have one end extending to first mechanism chamber 15 through through holes 9A and 9B formed in partition 12L, and the other end is partition 12R. It extends to the second mechanism chamber 16 through the through holes 9A and 9B formed in the holes. The divided floor plate drive shafts 52A and 52B have smaller cross-sectional diameters than the diameters of the through holes 9A and 9B, and the divided floor plate drive shafts 52A and 52B pass through the through holes 9A and 9B in a non-contact manner. Referring to FIGS. 5 and 6, both end portions of divided floor plate drive shafts 52 </ b> A and 52 </ b> B are holes formed in frame body 80 (first frame member 81) in first mechanism chamber 15 and second mechanism chamber 16. And is rotatably supported by a rolling bearing 58 fixed to the frame body 80.

  Referring to FIG. 5, a rotary actuator 54 is provided in the lower part of the first mechanism chamber 15. One end of a pair of operating arms 55 is pin-connected to the rotary actuator 54 and extends in the opposite direction. One end of a lever member 56 is pin-connected to the other end of each operating arm 55 and further divided to the other end of the lever member 56 One end of the floor plate drive shafts 52A and 52B is fixed. When the rotary actuator 54 rotates counterclockwise, the divided floor plate drive shaft 52B rotates clockwise through the operating arm 55 and the lever member 56, and the divided floor plate drive shaft 52A rotates counterclockwise and is closed. The divided floor plates 51A and 51B are opened. The object P to be weighed in the measuring cylinder 4 by the divided floor plates 51A and 51B falls from the lower opening of the measuring cylinder 4. The object to be weighed P that has dropped from the measuring cylinder 4 is discharged from the measuring device 1 through the lower opening 22 of the housing 11.

  Referring to FIG. 5, two load cell connecting members 83 for connecting the load cell 43 to the frame 80 are fixed to the second frame member 82 of the frame 80 provided in the first mechanism chamber 15 with a gap therebetween. The frame body 80 is suspended by two load cells 43 that are fixedly installed in the first mechanism chamber 15. Referring to FIG. 6, a load cell connecting member 83 for connecting the load cell 43 to the frame body 80 is also fixed to the second frame member 82 of the frame body 80 provided in the second mechanism chamber 16. 80 is suspended by a load cell 43 fixedly installed in the second mechanism chamber 16. These three load cells 43 measure the mass of the object P to be weighed temporarily in the measuring cylinder 4 by being dammed by the divided floor plates 51A and 51B. The average value of the output data of the three load cells 43 is used for calculating the mass value of the object P to be weighed. The three load cells 43 are also provided with the mass of the frame 80, the receiving shafts 6A and 6B, the measuring cylinder 4, the divided floor plates 51A and 51B, the divided floor plate drive shafts 52A and 52B, etc. Needless to say, the value obtained by subtracting the mass of represents the mass of the object P itself.

  In the weighing device 1, the load cell 43 is not attached to the receiving shafts 6 </ b> A and 6 </ b> B that suspend the measuring tube 4. As described above, the receiving shafts 6A and 6B can be removed easily and in a short time by removing the split member 82a. It is not necessary to remove the load cell connecting member 83 and the load cell 43 when removing the receiving shafts 6A and 6B. The measuring cylinder 4 which is not suspended by the receiving shafts 6A and 6B by removing the receiving shafts 6A and 6B is placed on the divided floor plates 51A and 51B. Since the measuring cylinder 4 and the divided floor plates 51A, 51B are configured separately and the receiving shafts 6A, 6B can be easily removed, the measuring cylinder 4 can be easily carried out of the measuring chamber 14. Cleaning or cleaning of the measuring tube 4 and the measuring chamber 14 can be started in a short time, and reassembly after cleaning or cleaning can be completed in a short time. Since the inside of the measuring chamber 14 can be cleaned and washed to every corner, it is easy to prevent or suppress contamination in the measuring chamber 14. Moreover, since the first and second mechanism chambers 15 and 16 are partitioned by the partition walls 12L and 12R, the inside of the measuring chamber 14 can be washed with water.

  Further, in the weighing device 1, no bolt is provided in the weighing chamber 14, and members installed or arranged in the weighing chamber 14 are basically fixed or supported in the first and second mechanism chambers 15, 16. The Since the bolt drop due to vibration or the like is completely prevented, it is possible to prevent the bolt from being mixed into the object P to be weighed in the weighing chamber 14. This boltless mechanism greatly contributes to the cleaning of the measuring chamber 14 and the efficiency of cleaning.

  FIG. 9 shows an enlarged end view along the line IX-IX in FIG.

  As described above, the receiving shafts 6A and 6B are passed through the through holes 7A and 7B formed in the partition walls 12L and 12R in a non-contact manner, and the divided floor plate drive shafts 52A and 52B are also connected to the partition walls 12L and 12R, respectively. The opened through holes 9A and 9B are passed through in a non-contact manner (see FIG. 7). Each of the total eight non-contact through holes is provided with a blow mechanism described below. Since all of the eight blow mechanisms have the same structure, the blow mechanism provided in the through hole 7A formed in the partition wall 12R will be described below.

  The blow mechanism 70 includes an annular outer member 71 fixed to the wall surface on the second mechanism chamber 16 side of the partition wall 12R, and an annular inner member 72 attached to an annular recess formed on the inner surface of the annular outer member 71. . The outer shapes of the annular outer member 71 and the annular inner member 72 are both annular and are concentrically arranged, and holes 73 and 77 through which the receiving shaft 6A passes are formed at the center. The diameters of the holes 73 and 77 are larger than the cross-sectional diameter of the receiving shaft 6A, and the receiving shaft 6A is not in contact with the holes 73 and 77 as well.

  An air flow path is formed inside the blow mechanism 70. The air flow path is formed, for example, at 16 equiangular intervals at the outer periphery of the annular inner member 72, and the annular flow path 75a extends toward the center of the annular inner member 72. A plurality of radial flow paths 75b connected to each other, and branch flow paths 75c and 75d that branch the tip of the radial flow path 75b into two. Air, preferably compressed air, is fed into the annular flow path 75a from the compressor (which may be a blower) through the hose 78. The air sent into the annular flow path 75a passes through the radial flow path 75b from the annular flow path 75a and is further sent into the branch flow paths 75c and 75d. Air is ejected from the outlets (injection ports) of the branch flow paths 75c and 75d.

  One branch channel 75 c is formed obliquely toward the second mechanism chamber 16, and the other branch channel 75 d is formed obliquely toward the measuring chamber 14. Due to the air jetted from the branch flow path 75c toward the second mechanism chamber 16, foreign matter or the like in the second mechanism chamber 16 flows into the measuring chamber 14 through the non-contact through holes 7A, 7B, 9A, 9B. It is prevented. Due to the air jetted from the branch flow path 75d toward the measuring chamber 14, the object P (especially powdered material) in the measuring chamber 14 passes through the non-contact through holes 7A, 7B, 9A, 9B and is second. Inflow into the mechanism chamber 16 is also prevented.

  As described above, the weighing object P that has been weighed in the weighing chamber 14 falls out of the weighing chamber 14 when the divided floor plates 51A and 51B are opened, so the moment the weighing object P falls, the weighing chamber The pressure in the chamber 14 is temporarily negative (a negative pressure is momentarily generated in the measuring chamber 14 to the extent that the door is recessed if ventilation is not considered). When the inside of the measuring chamber 14 instantaneously becomes negative pressure, air flows from the first and second mechanism chambers 15 and 16 to the measuring chamber 14 through the through holes 7A, 7B, 9A, and 9B. In order to reduce or prevent the flow of air due to this pressure fluctuation, the compressor to blow mechanism 70 at the timing of discharging the object P from the measuring chamber 14, that is, the timing of opening the divided floor plates 51A and 51B by the floor plate opening / closing mechanism 5. It is preferable to increase the amount of air fed into the air flow path. The flow of air from the first and second mechanism chambers 15 and 16 to the measuring chamber 14 due to pressure fluctuations can be weakened or eliminated (inhibition of atmospheric pressure fluctuations) through the through holes 7A, 7B, 9A and 9B. It is possible to effectively prevent foreign matters from entering. The amount of air may be increased in synchronization with the opening operation of the divided floor plates 51A and 51B by an injection amount control device (not shown) installed in the first mechanism chamber 15 and connected to the compressor.

DESCRIPTION OF SYMBOLS 1 Weighing device 2 Cylindrical hopper 3 Supply valve mechanism 4 Weighing cylinder 4a Hanging bracket 5 Floor board opening-and-closing mechanism 6A, 6B Measuring cylinder receiving shaft 7A, 7B, 9A, 9B Non-contact through-hole 8 Through-hole
11 Enclosure
12L, 12R bulkhead
14 Weighing room
15 1st mechanism room
16 Second mechanism room
31 Supply valve
43 Load cell
51A, 51B Split floor board
52A, 52A split floor drive shaft
70 Blow mechanism (gas injection mechanism)
71 Annular outer member
72 Annular inner member
75a Annular channel
75b Radial flow path
75c, 75d Branch flow path
80 Frame (suspending member)
82a Clamping member

Claims (7)

A housing, and first and second partitions that partition the internal space of the housing into a weighing chamber and first and second mechanism chambers on both the left and right sides of the weighing chamber ,
A measuring cylinder that is suspended in the measuring chamber and temporarily stores an object to be weighed, with an open top and bottom, a supply valve that adjusts the supply amount of the object to be weighed into the measuring cylinder, and a position directly below the measuring cylinder. is first aligned in the longitudinal direction, the second two openable floorboards that consists by dividing floorboards provided with the measuring chamber,
A mass measuring device for measuring the mass of the object to be weighed, a supply valve driving device for controlling the supply valve, and a floor plate opening / closing drive device for opening and closing the floor plate are provided in at least one of the first and second mechanism chambers. Has been
First and second receiving shafts that suspend the measuring tube on both front and rear wall surfaces of the measuring tube pass through receiving shaft through holes formed in the first and second partition walls, and Extends to the second mechanism room,
Floor plate drive shaft through-holes formed in the first and second partition walls are connected to the first and second divided floor plates and connected to the floor plate opening / closing drive device. And extends to the first and second mechanism chambers,
In the first mechanism chamber, one end of the first and second receiving shafts and one end of the first and second drive shafts are fixed to the first suspension member, and the second mechanism chamber The other end of the first and second receiving shafts and the other end of the first and second drive shafts are fixed to a second suspension member,
The first and second suspension members are respectively suspended by the mass measuring instrument;
Weighing device. First upper SL, the second receiving axis, the first, is passed through a non-contact second partition the formed receiving shaft through-hole,
First upper SL, the second drive shaft, said first, has been threaded through the second partition wall which is formed in the floor plate drive shaft through holes in a non-contact,
The weighing device according to claim 1. Both end portions of the first and second receiving shafts are fixed to the first and second suspension members by detachable split members,
The weighing device according to claim 1 or 2. A gas is directed to the receiving shaft through hole and the floor plate drive shaft through hole around the first and second mechanism chambers of the receiving shaft through hole and the floor plate drive shaft through hole, and the measuring chamber and the first 1, a gas injection mechanism is provided for injecting toward each of the second mechanism chambers,
The weighing device according to claim 2 or 3 . The gas injection mechanism is
An annular flow path that provides a flow path for the gas to be sent, and a plurality of branch flow paths that connect the annular flow path and the plurality of injection ports facing the receiving shaft through hole and the floor plate drive shaft through hole,
Each of the branch flow paths is divided into at least two branches in the middle, at least one of the divided flow paths is inclined toward the measuring chamber, and at least the other is inclined toward the first and second mechanism chambers. doing,
The weighing device according to claim 4 . The gas injection mechanism includes an injection amount control device that increases an injection amount of the gas when the first and second divided floor plates are opened by the floor plate opening / closing drive device.
The weighing device according to claim 4 or 5 . No bolts are used in the weighing chamber.
The weighing device according to any one of claims 1 to 6 .

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