JP6076104B2 - Automatic weighing device - Google Patents

Description

  The present invention relates to an automatic weighing device for weighing an object to be weighed made of a granular material having fluidity such as powder or granules, and in particular, surrounding fine foreign matters are mixed into the object to be weighed during measurement. The present invention relates to an automatic weighing device that can prevent the above.

  For example, a measuring device for measuring an object to be weighed made of a granular material having fluidity such as a powder or a granular material is generally known. The weighing apparatus 101 shown in FIGS. 7 and 8 is provided with a hopper 110 for supplying an object to be weighed on the upper side of the apparatus. A radial gate type supply valve 120 having fan-shaped side plates 121 on both sides is provided below the hopper 110, and the supply amount of the object to be weighed can be adjusted through the supply valve 120. Below the radial gate type supply valve 120, there is provided a metering tank 130 for metering a metered object to be metered. A fixed-quantity tank receiving shaft 131 is attached to the fixed-quantity tank 130, and a weight detector 133 for measuring an object in the fixed-quantity tank through a fixed-quantity tank receiving shaft 131 and a receiving shaft suspension rod 132 is provided above the side of the fixed-quantity tank 130. Is provided. A lower lid 140 is provided at the lower part of the metering tank 130, and the weighed object is filled with a metered object in a container, for example, a bag or the like below, by opening the lower lid 140.

By the way, when the opening / closing mechanism of the lower lid of the metering tank is opened / closed, foreign matters such as fine metal powder may be generated due to wear between the devices, and the foreign matter may be mixed into the object to be weighed. In order to prevent this, a “quantitative filling device” disclosed in Japanese Patent Application Laid-Open No. 2009-29497 (Japanese Patent No. 4448871) has been filed as a patent.
The “quantitative filling device” disclosed in Japanese Patent Application Laid-Open No. 2009-29497 includes a first space in which a first hopper (a hopper in this case) and a second hopper (a quantification tank in this case) are arranged, and a first gate member (a supply in this case). A first drive device (opening / closing mechanism of the supply valve) of the valve), a weight detector and a second drive device (opening / closing mechanism of the lower lid in this case) of the second gate member (in this case, the lower lid) are arranged. A partition is provided between the space and the partition prevents foreign matter generated in the second space from entering the second hopper (measuring tank in this case) disposed in the first space. A plurality of through holes are formed in the partition wall, and each through hole has a first gate shaft fixed to the first hopper and connected to the first driving device, and a second gate shaft fixed to the second hopper and connected to the second driving device. The supporting members for connecting and fixing the weight detector and the main body of the second hopper penetrate each other in a non-contact state. Because of the non-contact state, there is a slight gap between the inner periphery of the through hole and the outer periphery of each of the first and second gate shafts and the support member.

JP 2009-29497 (Patent No. 4448871)

  However, when the weighing object in the second hopper disposed in the first space is weighed, the second gate member of the second hopper is opened, and the weighing object in the second hopper is discharged downward. The volume corresponding to the amount of the discharged object to be weighed is instantaneously in a vacuum state, and the first space in which the second hopper is disposed is temporarily in a negative pressure state. When the first space is in a negative pressure state, a slight gap is generated between the inner periphery of the through hole and the outer periphery of each of the first and second gate shafts and the support member because of the non-contact state. The air under atmospheric pressure in the second space is sucked into the first space through a slight gap in the through hole of the partition wall in a non-contact state. Then, when foreign matter such as fine metal powder is contained in the air under atmospheric pressure in the second space, the air containing fine foreign matter passes through a slight gap in the through hole of the partition wall. Thus, there is a possibility that the fine foreign matter that has flowed into the first space flows into the object to be weighed and is supplied from the first hopper.

Further, the first gate member is a radial gate type that rotates up and down, and a first gate shaft is attached to each of the left and right side surfaces of the rotation gate of the radial gate type first gate member. It has a supported structure. And the fan-shaped side board for attaching a 1st gate axis | shaft is each provided in the both sides of the 1st gate member.
By the way, a space is provided between the lower end of the first hopper and the concave arc bottom surface of the first gate member so as to have a slight gap. This is to prevent the concave arc bottom surface from always contacting the lower end of the first hopper when the first gate member rotates up and down.
At this time, the size of the slight gap is 1.5 to 2 times the particle size of the object to be weighed made of a granular material having fluidity. When the object to be weighed is a soft granular material, it is about 1.5 times the particle diameter, and when the object to be weighed is a hard granular material, it is about twice the particle diameter. This is because when the gap is smaller than this, a part of the granular material to be weighed is sandwiched between the gaps, and the first gate member cannot be smoothly rotated up and down and cannot be opened and closed. On the other hand, if it is larger than this, a part of the object to be weighed in the granular material scatters from the enlarged gap, and it becomes impossible to supply a constant object to be weighed.
Therefore, the gap between the lower end of the first hopper and the arc-shaped bottom surface of the first gate member is adjusted each time according to the particle size of the object to be supplied. The adjustment of the gap is performed by finely adjusting the left and right first gate shafts up and down, but it is very troublesome to finely adjust the left and right first gate shafts up and down evenly.

Further, when the first gate member is removed or attached by maintenance or the like, the lower arc side of the first hopper enters the concave arc portion in the center of the first gate member, Since the fan-shaped side plate for attaching the first gate shaft is provided at the center of rotation, when the first gate member is taken out in the axial direction of the left and right first gate shafts, the lower side of the central first hopper is Since it hits the left and right fan-shaped side plates, the lower side of the first hopper becomes a hindrance and cannot be taken out or attached in that direction.
For this reason, the first gate member is taken out and attached in the front-rear direction orthogonal to the axial direction of the first gate shaft that moves the lower side of the first hopper. In this case, the first gate member is rotated upward about 90 degrees around the axis of the first gate axis in the forward or backward direction, and the concave arc portion of the first gate member hits the lower side of the first hopper. It is removed and attached so that there is no. However, it is very difficult to keep the first gate member having a certain weight inclined substantially vertically, and the first gate shafts on both sides of the first gate member are equally attached to the left and right. Was also troublesome.

  The present invention has been devised in view of the above-described problems, and has been devised to solve the problems. The object of the present invention is to allow fine foreign substances to flow from a slight gap between through holes formed in a partition wall. In addition, the radial gate type supply valve provided at the bottom of the hopper is cantilevered to facilitate fine adjustment of the gap between the hopper lower end and the supply valve. It is an object of the present invention to provide an automatic metering device that makes it possible to attach and detach a supply valve in the axial direction of the rotation axis of the supply valve and to facilitate the work.

  In order to achieve the above-mentioned problems, the invention of claim 1 is characterized in that the outside is surrounded by a box-shaped housing, and the inside of the housing is partitioned into a measuring chamber and a mechanism chamber by a partition wall, A hopper serving as a passage for receiving the object to be weighed from the outside on the upper side, a radial gate type supply valve for adjusting the capacity of the object to be weighed on the lower end, and a metering tank for measuring the object to be measured below the supply valve A lower lid that opens downward is attached to the bottom of the quantitation tank, and both sides of the tank support member that supports the quantification tank from both sides of the front and rear are extended through the partition wall to the mechanism chamber side to support the tank. Both sides of the lid shaft arranged in parallel with the member are extended to the mechanism chamber side through the partition wall, and the object to be weighed is measured inside the mechanism chamber via both sides of the tank support member. Weight detector, tank support member and lid shaft bearing, supply valve and lower lid drive In addition, a suspension plate for suspending the lid shaft from the tank support member is disposed, and the tank support member and the lid shaft are in a non-contact state with the tank support member and the lid shaft at a location where the tank support member and the lid shaft penetrate in a non-contact manner. It comprises means provided with a non-contact airtight mechanism for blocking the inflow of air from the mechanism chamber to the measuring chamber through air injection.

  In the invention of claim 2, the outside side is enclosed by a box-shaped housing, the inside of the housing is partitioned into a measuring chamber and a mechanism chamber by a partition wall, and an object to be weighed is placed above the inside of the measuring chamber. A hopper serving as a passage to be received from is provided, a cantilevered radial gate type supply valve for adjusting the capacity of the object to be weighed is provided at the lower end, and a metering tank for measuring the object to be weighed is arranged below the supply valve. A lower lid that opens downward is attached to the bottom of the metering tank, a supply valve outlet is formed in the partition wall on the cantilever support side of the supply valve, and the supply valve outlet is removably closed with a supply valve mounting block plate. The other end of the supply valve shaft connected to the cantilever support side of the valve extends through the supply valve mounting block plate and extends into the mechanism chamber, and the outer periphery of the supply valve shaft extends to the supply valve mounting block plate. A cylindrical valve shaft contact through cylinder hole that penetrates in close contact with the inner periphery is provided. Both sides of the tank support member that supports the tank sandwiched from both the front and rear sides are extended to the mechanism chamber side through the partition wall, and the both sides of the lid shaft that is arranged parallel to the tank support member vertically penetrate the partition wall. A weight detector for measuring the object to be weighed through both sides of the tank support member, the bearings of the supply valve shaft, the tank support member and the lid shaft inside the mechanism chamber. Each supply mechanism of the supply valve and the lower lid, and a suspension plate for suspending the lid shaft on the tank support member are disposed, and the tank support member and It comprises means provided with a non-contact airtight mechanism that is in non-contact with the lid shaft and prevents air from flowing from the mechanism chamber to the measuring chamber through air injection.

  According to the automatic weighing device according to claim 1 and claim 2 comprising means for solving the problem, the tank support member and the lid shaft that penetrate in a non-contact state to the partition wall that partitions the weighing chamber and the mechanism chamber. In spite of having a gap with the through-hole, the non-contact airtight mechanism injects air containing fine foreign matter on the mechanism chamber side into the measuring chamber side through the gap around the through-hole. Therefore, it is possible to reliably prevent foreign matters from being mixed into the object to be weighed.

  Further, according to the automatic metering device according to claim 2, in addition to the above-described effect, the supply valve has a cantilevered support structure so that the supply valve can be detached toward the cantilevered support side or attached from the direction. In addition, since the outer periphery of the supply valve shaft is in close contact with the inner periphery of the valve shaft contact through cylinder hole of the supply valve mounting closing plate, the supply valve shaft is in contact with the valve shaft. It is firmly supported by the cylinder hole and does not swing inside the through-hole cylinder hole.Further, fine adjustment of the gap between the lower end of the hopper and the supply valve only requires adjustment of one cantilever support side. Thus, replacement work such as attachment and removal of the supply valve and fine adjustment of the gap between the lower end of the hopper and the supply valve can be facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall front view of an inside of an automatic weighing device showing an embodiment for carrying out the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. (A) is a top view on the supply valve side showing a form for carrying out the present invention, (B) is a front view on the supply valve side showing a form for carrying out the present invention. (A) is a left side view on the supply valve side showing a form for carrying out the present invention, and (B) is a partial front sectional view on the other end side of the supply valve showing a form for carrying out the present invention. (A) is a side end view of a non-contact airtight mechanism showing an embodiment for carrying out the present invention, and (B) is a BB arrow view of the same figure (A). (A) is a side end view of another non-contact airtight mechanism showing an embodiment for carrying out the present invention, and (B) is a view taken along the line BB in FIG. It is a whole front view inside a conventional apparatus. It is a whole left side view inside a conventional apparatus.

  Hereinafter, the present invention will be described more specifically based on embodiments for carrying out the invention described in the drawings.

  In the figure, the automatic weighing apparatus 1 is surrounded by a box-shaped housing 11 on the outside, and the inside is surrounded by bulkheads 12 and 13, a substantially central weighing chamber 14, and mechanism chambers 15 and 16 on both sides thereof. It is divided into. In the measuring chamber 14, the hopper 2, the supply valve 3, the metering tank 4, and the lower lid 5 are provided in this order from the upper side to the lower side.

  The hopper 2 is a passage for receiving an object to be weighed made of powder particles having fluidity such as powder and particles from the outside. The hopper 2 is formed of, for example, a cylindrical cylinder, and is attached vertically, and both upper and lower ends thereof are opened. The upper end of the opened hopper 2 is connected in communication with the lower end of an external hopper 21 provided outside. A supply valve 3 is provided on the lower end side of the hopper 2. The side surface of the lower end of the hopper 2 is formed in a convex arc corresponding to the shape of the concave arc of the concave arc bottom plate 31 of the supply valve 3 to be described later, and a gap of a predetermined interval is maintained with the concave arc bottom plate 31. It has become.

  The supply valve 3 adjusts the supply amount of the object to be weighed that has been supplied into the hopper 2, and has a cantilevered radial gate type structure. The supply valve 3 is vertically oriented with respect to the rotation center of the radial gate. It has a structure that can rotate forward and reverse. The supply valve 3 has a concave arc bottom plate 31 on the side surface that rotates up and down, and a fan-shaped cantilever side plate 32 is integrally provided in a perpendicular direction on one side surface that is flush with the plane of rotation.

  Conventionally, the one corresponding to the cantilever side plate 32 has been provided on both side surfaces of the concave arc bottom plate 31, but in the present plan, this is provided only on one side of the concave arc bottom plate 31. For this reason, the supply valve 3 can be pulled out toward the partition wall 12 side. Alternatively, it can be inserted from the partition wall 12 side.

  At the side end of the concave arc bottom plate 31 on the side where the cantilever side plate 32 is not provided, a slightly projecting low wall 31a is formed in the length direction of the side end to prevent the object to be weighed from deviating. The low wall 31a has an arc shape with a slight height when viewed from the side. When pulling out toward the partition wall 12, the entire supply valve 3 is moved slightly downward so that the low wall 31a does not hit the lower end of the hopper 2. The same applies when mounting.

  One end of a supply valve shaft 33 having a circular cross section is connected to the cantilever side plate 32 at the center of the concave arc of the concave arc bottom plate 31 in a perpendicular direction, and the supply valve 3 has a cantilever support structure. A bracket 32 a for reinforcing and supporting one end side of the supply valve shaft 33 to prevent deformation is provided at a corner between the cantilever side plate 32 and one end side of the supply valve shaft 33. The other end side of the supply valve shaft 33 extends toward the adjacent mechanism chamber 15 side.

  The other end side of the supply valve shaft 33 extending to the mechanism chamber 15 side is rotatably supported by two bearings of a main valve bearing 34 and a sub valve bearing 35 that are provided at separate positions. Both the main valve bearing 34 and the sub valve bearing 35 are provided in the mechanism chamber 15 on the side where the supply valve shaft 33 is extended.

  Of these, the main valve bearing 34 supports the supply valve shaft 33 in a fixed state, and is attached to the front end side of the supply valve shaft 33. The main valve bearing 34 is installed on a valve pedestal 34 a attached inside the mechanism chamber 15. The valve pedestal 34a has its end bent downward and is connected to and supported by the surface of a supply valve mounting reinforcing plate 37 described later.

  The sub valve bearing 35 is attached to an intermediate portion between the main valve bearing 34 and the cantilever side plate 32. The sub-valve bearing 35 is provided to support the middle portion of the supply valve shaft 33 which is easily bent to prevent the bending. The sub-valve bearing 35 uses a swing bearing of a bearing, and can support the supply valve shaft 33 while slightly tilting and swinging in a direction perpendicular to the axis of the supply valve shaft 33. It has become. That is, the auxiliary valve bearing 35 can be supported while following the bending even if the supply valve shaft 33 is bent. The auxiliary valve bearing 35 is attached in close contact with the surface of the annular stopper piece 38a of the valve shaft contact through cylinder hole 38 described later.

  On the upper side of the partition wall 12 on the side where the supply valve shaft 33 extends toward the mechanism chamber 15, for example, a rectangular supply valve inlet / outlet 12 a is opened. The supply valve inlet / outlet 12a has a size that allows the supply valve 3 to enter and exit with sufficient margin. That is, the supply valve 3 in the measuring chamber 14 can be taken out from or taken into the mechanism chamber 15 on the side where the supply valve shaft 33 is extended through the supply valve take-out inlet 12a. Yes.

  The supply valve outlet 12a is opened when the supply valve 3 is taken out or attached, but the supply valve attachment closing plate 36 is attached and the opening portion is closed during other use. The supply valve attachment blocking plate 36 is detachably attached to the surface of the partition wall 12 on the mechanism chamber 15 side with a bolt or the like. A plurality of elongated holes 36a for bolts are formed on the peripheral edge side of the rectangular shape of the supply valve mounting blocking plate 36, and the mounting of the supply valve mounting blocking plate 36 can be adjusted by the long holes 36a. It is possible to adjust the supply valve 3 attached thereto.

  A supply valve attachment reinforcing plate 37 is attached to the supply valve attachment blocking plate 36. The supply valve attachment reinforcing plate 37 is detachably attached to the surface of the supply valve attachment blocking plate 36 on the mechanism chamber 15 side by bolts or the like. The supply valve mounting closing plate 36 and the supply valve mounting reinforcing plate 37 are provided with a cylindrical valve shaft contact through cylinder hole 38 through which the supply valve shaft 33 passes. The supply valve mounting reinforcing plate 37 may be omitted as necessary.

  The supply valve shaft 33 has the same outer diameter as the inner diameter of the valve shaft contact through cylinder hole 38, and the outer periphery of the supply valve shaft 33 is in close contact with the entire inner periphery of the valve shaft contact through cylinder hole 38. It is attached by penetrating in contact. The feed valve shaft 33 that penetrates rotates forward and backward in a state in which the outer periphery thereof is in close contact with and in contact with the entire inner periphery of the valve shaft contact through cylinder hole 38. The valve shaft contact through cylinder hole 38 is provided from the mechanism chamber 15 side toward the measuring chamber 14 side. An annular stopper piece 38a is formed on the outer periphery of the end of the valve shaft contact through cylinder hole 38 on the mechanism chamber 15 side. For example, a bush is used for the valve shaft contact through cylinder hole 38.

  The supply valve shaft 33 penetrating the supply valve attachment blocking plate 36 and the supply valve attachment reinforcement plate 37 has no gap at all because the outer periphery thereof is in close contact with the inner periphery of the valve shaft contact through cylinder hole 38. The valve shaft contact through cylinder hole 38 prevents the air on the mechanism chamber 15 side from flowing into the measuring chamber 14 side. That is, it is possible to prevent fine foreign matters such as metal powder generated on the mechanism chamber 15 side from being mixed with air and flowing into the measuring chamber 14 through the valve shaft contact through cylinder hole 38. As described above, the auxiliary valve bearing 35 is attached to the surface of the annular stopper piece 38a of the valve shaft contact through cylinder hole 38.

  The other end side of the supply valve shaft 33 is linked to a motor 39 b via a speed reducer 39 a constituting the drive mechanism 39. The speed reducer 39 a is provided on the valve seat 34 a on the other end side of the supply valve shaft 33 closer to the front end side than the main valve bearing 34. When the motor 39b is driven, the driving force is transmitted to the supply valve shaft 33 via the speed reducer 39a, the supply valve shaft 33 is rotated about the axis, and the supply valve 3 to which one end of the supply valve shaft 33 is connected is connected. Rotate forward and reverse.

  A valve shaft rotation detector 33 a that detects the rotation of the supply valve shaft 33 is provided inside the mechanism chamber 15. The valve shaft rotation detector 33a is attached to a detector attachment plate 33b attached downward from the end of the speed reducer 39a. A timing pulley 33c is mounted around the shaft on the other end side of the supply valve shaft 33 to which the valve shaft rotation detector 33a is attached. The timing pulley 33c and the valve shaft rotation detector 33a below the timing pulley 33c are mounted. Between them, the timing belt 33d is stretched in an oval shape.

  The fixed amount tank 4 is a tank for measuring an object to be weighed supplied through the upper hopper 2. The metering tank 4 is arranged below the supply valve 3 inside the measuring chamber 14. The fixed amount tank 4 is a rectangular cylinder as viewed from above. The supply valve 3 is provided on the upper side of the metering tank 4 in a slightly spaced state. Further, an anti-scattering plate 41 is attached to the upper part of the metering tank 4 so as not to hit the supply valve 3 that rotates forward and backward in the vertical direction. The scattering prevention plate 41 is attached so as to surround the entire area on the front side of the metering tank 4 and the front side of the left and right side surfaces.

  A lower lid 5 is attached to the lower part of the quantification tank 4 and opens downward in both directions. The lower lid 5 is attached in a V shape when viewed from the left and right side surfaces of the metering tank 4 on the partition walls 12 and 13 side. For this reason, the lower part of the quantification tank 4 is formed in a V shape with its left and right side faces downward, and when the lower lid 5 is closed, the object to be weighed does not flow out from the left and right side parts of the lower part. .

  The fixed amount tank 4 has a tank support member 42 attached to the upper side of the front and rear side surfaces located on the front side and the rear side, respectively, in the left-right direction. Both sides of the tank support member 42 extend through the partition walls 12 and 13 provided on both sides of the measuring chamber 14 and extend to the mechanism chambers 15 and 16, respectively. Both tank support members 42 support the quantitative tank 4 in a state of being sandwiched from the front and rear, and the total weight of the quantitative tank 4 and the object to be weighed supplied into the quantitative tank 4 acts on both tank support members 42.

  One end of the tank support member 42 that extends through the partition wall 12 and extends into the mechanism chamber 15 is connected to the lower side through which the detection suspension rod 43a attached to the weight detector 43 faces downward. Yes. The weight detector 43 measures the total weight of the metering tank 4 and the object to be weighed supplied into the metering tank 4 through the tank support member 42. That is, the end side of the tank support member 42 is suspended by the weight detector 43 through the detection suspension rod 43a, and the weight is measured.

  The weight detector 43 is installed on a detection pedestal 43 b attached above the end of the tank support member 42 in the mechanism chamber 15. The detection suspension rod 43a is attached downward through the detection base 43b. The detection pedestal 43b has an end bent downward and is connected to and supported by the surface of the partition wall 12 on the mechanism chamber 15 side.

  A hole is formed in the end of the tank support member 42, and the lower side of the guide rod 44 attached downward passes through the hole. The upper side of the guide rod 44 is connected to the detection base 43b. The hole diameter at the end of the tank support member 42 is larger than the outer diameter on the lower side of the guide rod 44, and the lower side of the guide rod 44 penetrates through this hole in a loosely fitted state. That is, the tank support member 42 can be raised and lowered with respect to the lower side of the guide rod 44. Through the guide rod 44, the end side of the tank support member 42 in the mechanism chamber 15 is prevented from being shifted back and forth and left and right.

  Further, at the other end of the tank support member 42 that extends through the partition wall 13 and extends into the mechanism chamber 16, a lower side through which a detection suspension rod 43 a that is similarly attached downward is attached. It is connected. The metering tank 4 and the object to be weighed supplied into the metering tank 4 are measured by the left and right weight detectors 43 through the tank support member 42.

  The weight detector 43 is installed on a detection pedestal 43 b attached to the upper side of the end portion of the tank support member 42 in the mechanism chamber 16. The detection suspension rod 43a is attached downward through the detection base 43b. The detection pedestal 43b has an end bent downward and is connected to and supported by the surface of the partition wall 13 on the mechanism chamber 16 side. Since the mechanism chamber 16 is narrower than the mechanism chamber 15, the weight detector 43 in the mechanism chamber 16 is installed on the detection pedestal 43 b in a state of being oriented in a perpendicular direction.

  A hole is also formed on the other end side of the tank support member 42, but the hole is formed on the intermediate side between the detection suspension rod 43 a and the partition wall 13. Similarly, the lower side of the guide rod 44 mounted downward passes through this hole. The upper side of the guide rod 44 is connected to the detection base 43b.

  Similarly, the hole diameter on the other end side of the tank support member 42 is larger than the outer diameter on the lower side of the guide rod 44, and the lower side of the guide rod 44 penetrates into this hole in a loosely fitted state. That is, the tank support member 42 can be raised and lowered with respect to the lower side of the guide rod 44. Through the guide rod 44, the end side of the tank support member 42 in the mechanism chamber 16 is prevented from being shifted back and forth and left and right.

  A lid shaft 51 is attached to the upper side of a pair of front and rear lower lids 5 provided in a V shape when viewed from the left and right side surfaces at the lower part of the quantification tank 4, respectively. The lid shaft 51 extends to the mechanism chambers 15 and 16 through both sides of the partition walls 12 and 13 provided on both sides of the weighing chamber 14.

  Both end portions of the lid shaft 51 extending to the mechanism chambers 15 and 16 side are rotatably supported by bearings 52 provided inside the mechanism chambers 15 and 16, respectively. Each bearing 52 is connected to the lower side of each suspension plate 53 disposed vertically inside the mechanism chambers 15 and 16. The upper portion of each suspension plate 53 is connected to and suspended from the end portions on both sides of the tank support member 42.

  A rotary actuator 54 a of a drive mechanism 54 that opens and closes the lower lid 5 is provided inside the mechanism chamber 15. The rotary actuator 54 a is attached to the suspension plate 53 at the center position of the front and rear bearings 52. In this way, the suspension plate 53 disposed inside the mechanism chamber 15 is provided with a rotary actuator 54a and bearings 52 on the front and rear sides of the rotary actuator 54a.

  Lower lid levers 54b are provided to project upward from the ends of the front and rear lid shafts 51 on the inner side of the mechanism chamber 15, respectively. The rotary actuator 54a is pin-coupled to the base end of a lower lid operating rod 54c whose tip is pin-coupled to the upper end of the lower lid lever 54b of each of the front and rear lid shafts 51.

  For example, in FIG. 2, when the rotary actuator 54a rotates counterclockwise, the base end side of the lower lid operating rod 54c on the left side of the rotary actuator 54a moves downward, and the base of the lower lid operating rod 54c on the right side of the rotary actuator 54a is moved. The end side is movable upward, and the lower lid 5 is opened downward through the lower lid lever 54b. When the rotary actuator 54a rotates clockwise in the opened state, it moves in the reverse direction and the lower lid 5 closes.

  By the way, the through-hole 61 or the through-hole 71 larger than the outer diameter of the tank support member 42 is formed in the location where the both ends of both said tank support members 42 penetrate the left and right partition walls 12 and 13, respectively. In each through hole 61 or each through hole 71, the tank support member 42 and the partition walls 12 and 13 are not in contact with each other, and the inflow of air from the mechanism chambers 15 and 16 to the measuring chamber 14 is performed through air injection. A non-contact airtight mechanism 6 or a non-contact airtight mechanism 7 for blocking is provided.

  Similarly, a through-hole 61 or a through-hole 71 larger than the outer diameter of the lid shaft 51 is formed at a position where both end sides of the both lid shafts 51 penetrate the left and right partition walls 12 and 13, respectively. 61 or a non-contact airtight mechanism 6 fork that prevents the inflow of air from the mechanism chambers 15 and 16 to the measuring chamber 14 when the lid shaft 51 and the partition walls 12 and 13 are not in contact with each other. Are each provided with a non-contact airtight mechanism 7.

  In the non-contact airtight mechanism 6 and the noncontact airtight mechanism 7, both the tank support member 42 and the lid shaft 51 and the partition walls 12 and 13 are in a non-contact state, and air flows into the measurement chamber 14 from the mechanism chambers 15 and 16. Although it functions to block air through the injection of air, there are some differences in structure.

  Among these, in the non-contact airtight mechanism 6 having the structure shown in FIG. 5, the through holes 61 formed in the partition walls 12 and 13 are larger than the outer diameters of the tank support member 42 and the lid shaft 51 that penetrate the holes 61. The tank support member 42 and the lid shaft 51 are configured to be able to penetrate the through hole 61 in a non-contact state. For example, a circular annular plate 62 is attached to the outer periphery of the tank support member 42 and the lid shaft 51 penetrating from the measuring chamber 14 to the mechanism chambers 15 and 16 side.

  The annular plate 62 attached to the outer periphery of the tank support member 42 and the lid shaft 51 is attached in a state having a non-contact gap on the surfaces of the partition walls 12 and 13 on the outer peripheral side of the through hole 61. As shown in FIG. 5, the non-contact gap is formed, for example, by forming a very small air annular injection gap 6a of about t = 0.5 mm on the entire circumference in the circumferential direction. Air is jetted from 6a toward the measuring chamber 14 to prevent the inflow of air from the mechanism chambers 15 and 16 to the measuring chamber 14 side.

  On the surface of the annular plate 62 on the mechanism chambers 15 and 16 side, for example, a circular exterior annular disk 63 that completely covers this is attached. The outer annular disk 63 is formed with a hole 63 a larger in the center than the outer diameter of the tank support member 42 and the lid shaft 51. An annular groove 63 b that is larger than the outer diameter of the annular plate 62 and deeper than the plate thickness of the annular plate 62 is formed on the outer peripheral surface side of the hole 63 a on the side corresponding to the surfaces of the partition walls 12 and 13.

  The outer annular plate 63 is attached with the outer peripheral surface of the annular groove 63b in close contact with the surfaces of the partition walls 12 and 13, and the outer annular plate 63 provides a non-contact gap on the surface of the annular plate 62 by the annular groove 63b. It is attached in the state of having. As shown in FIG. 5, the non-contact gap is formed, for example, by forming a very small air annular injection gap 6a of about t = 0.5 mm on the entire circumference in the circumferential direction. Air is jetted from the mechanism 6a toward the mechanism chambers 15 and 16 to prevent inflow of air from the mechanism chambers 15 and 16 to the measuring chamber 14 side.

  Thereby, the annular plate 62 attached to the outer periphery of the tank support member 42 and the lid shaft 51 is in a state where both surfaces thereof are not in contact with each other and the surfaces of the partition walls 12 and 13 on the outer peripheral side of the through hole 61 and the outer annular plate. It is sandwiched between the groove bottom surfaces of the 63 annular grooves 63b. And the non-contact clearance gap of these both surfaces forms said air annular injection gap | interval 6a, respectively.

  The inner diameter of the annular groove 63b is larger than the outer diameter of the annular plate 62, and a circular air supply passage 6b is formed between the annular plate 62 and the annular groove 63b on the outer peripheral side due to the difference in diameter. Is done. The air supply circuit 6b communicates with the air annular injection gap 6a, and the air supplied from the air passage 63e, which will be described later, spreads over the entire circumference by the air supply circuit 6b and reaches the entire circumference in the circumferential direction. It is injected from the formed air annular injection gap 6a.

  In the outer annular plate 63, a circular air pressure adjusting annular groove 63c having a shallower bottom than the annular groove 63b is formed on the outer peripheral surface side of the annular groove 63b on the side corresponding to the surfaces of the partition walls 12 and 13. . The air pressure adjusting annular groove 63c is provided to make the pressure of the air supplied to the air supply ring 6b constant. For example, four communication grooves 63d are formed between the air pressure adjusting annular groove 63c and the inner annular groove 63b, and the air whose air pressure is made constant by the air pressure adjusting annular groove 63c is Then, it flows through the communication groove 63d and flows into the air supply circuit 6b.

  The exterior annular disc 63 is formed with an air passage 63e having one end communicating with the air pressure adjusting annular groove 63c. The air passage 63e is formed, for example, from the outer edge of the exterior annular disk 63 toward the central annular groove 63b. A hose connection end portion 64 a on the downstream side of the air hose 64 is connected to the other end of the air passage 63 e on the outer edge side of the outer annular plate 63. The upstream side of the air hose 64 is connected to an air supply source (not shown).

  Further, in the non-contact airtight mechanism 7 having the structure shown in FIG. 6, the through holes 71 formed in the partition walls 12 and 13 are larger than the outer diameters of the tank support member 42 and the lid shaft 51 that pass through the holes 71, The tank support member 42 and the lid shaft 51 have a structure that can penetrate the through hole 71 in a non-contact state. On the outer periphery of the tank support member 42 and the lid shaft 51 penetrating from the measuring chamber 14 to the mechanism chambers 15 and 16 side, an inner annular plate 72 having a circular central hole 72a is provided with a gap of, for example, 3 to 5 mm over the entire periphery. Attached. That is, the tank support member 42 and the lid shaft 51 penetrate through the central hole 72a of the interior annular plate 72 in a non-contact state with a gap of, for example, 3 to 5 mm.

  The interior annular plate 72 attached to the outer periphery of the tank support member 42 and the lid shaft 51 with a gap therebetween is such that the surface on one side is in close contact with the surfaces of the partition walls 12 and 13 on the outer peripheral side of the through-hole 71 without any gap. It is attached. The inner annular plate 72 is sandwiched between the surfaces of the partition walls 12, 13 on the outer peripheral side of the through hole 71 and the groove bottom surface of the annular groove 63 b of the outer annular plate 63, and is engaged and mounted.

  The hole peripheral edge of the central hole 72a formed in the interior annular plate 72 is an annular tapered surface whose surface on the side facing the partition walls 12 and 13, that is, the side facing the measuring chamber 14, is inclined toward the central hole 72a to reduce the plate thickness. Is formed. This tapered surface protrudes to the inner peripheral side of the through hole 71. The opposite surface of the tapered surface, that is, the surface of the hole periphery on the side facing the mechanism chambers 15 and 16 is formed as an annular projecting surface that slightly protrudes toward the mechanism chambers 15 and 16. The inner periphery of the annular projecting surface is the same as the inner periphery of the annular tapered surface, but the outer periphery of the annular projecting surface is larger than the outer periphery of the annular tapered surface.

  A plurality of air radial injection ports 7a are provided in the circumferential direction between the outer peripheral side of the annular projection surface formed on both sides of the peripheral edge side of the central hole 72a of the inner annular plate 72 and the annular tapered surface. For example, it is formed at 16 positions at equal intervals. Each air radial injection port 7a is formed to be inclined toward the center of the central hole 72a of the interior annular plate 72 and toward the measuring chamber 14 side. Each air radial injection port 7a communicates with an air supply circuit 7b described later.

  For example, a circular exterior annular disc 73 is attached to the surface of the interior annular plate 72 on the mechanism chambers 15 and 16 side so as to completely cover it. The outer annular disk 73 is formed with a hole 73 a at the center that is larger than the outer diameter of the tank support member 42 and the lid shaft 51. An annular groove 73 b having an inner diameter that is the same as the outer diameter of the interior annular plate 72 is formed on the outer peripheral surface side of the hole 73 a on the side corresponding to the surfaces of the partition walls 12 and 13. The surface on the side excluding the inner peripheral side of the projecting surface of the interior annular plate 72 is in close contact with the surface that becomes the groove bottom surface on the peripheral side of the hole 73a of the annular groove 73b. The outer annular disk 73 is attached so that the outer peripheral surface of the annular groove 73b is in close contact with the surfaces of the partition walls 12 and 13.

  Further, a gap corresponding to the projection height of the projection surface of the interior annular plate 72 is formed between the one side surface of the interior annular plate 72 facing the groove bottom surface of the annular groove 73b. A circular air supply circuit 7 b is formed between the interior annular plate 72. The air supply circuit 7b communicates with the air radial injection port 7a, and the air supplied from the air passage 73c, which will be described later, spreads over the entire circumference by the air supply circuit 7b and is distributed at a plurality of locations in the circumferential direction. For example, it is injected from the air radial injection port 7a formed in 16 places at equal intervals.

  The exterior annular disc 73 is formed with an air passage 73c having one end communicating with the annular groove 73b. The air passage 73c is formed, for example, from the outer edge of the outer annular disc 73 toward the central annular groove 73b. A hose connection end 74 a on the downstream side of the air hose 74 is connected to the other end of the air passage 73 c on the outer edge side of the outer annular plate 73. The upstream side of the air hose 74 is connected to an air supply source (not shown).

Next, the operation based on the configuration of the embodiment for carrying out the invention will be described below.
Using the automatic weighing device 1, when weighing objects to be weighed in the metering tank 4, fine foreign substances such as metal powder generated in the mechanism chambers 15, 16 are mixed with the air and weighed. In order to avoid mixing with objects, an air supply source (not shown) is operated to supply air.

  In the non-contact airtight mechanism 6 having the structure shown in FIG. 5, air is supplied through the air hose 64 and flows into the air passage 63e of the outer annular plate 63 constituting the noncontact airtight mechanism 6 from the hose connection end 64a. To do. From there, it flows through the annular groove 63c for air pressure adjustment and the communication groove 63d, enters the air supply ring 6b, flows in the ring 6b in the circumferential direction, expands, and is formed on both sides of the entire circumference in the circumferential direction. Air is injected from the air annular injection gap 6a toward the measuring chamber 14 and the mechanism chambers 15 and 16, respectively.

  When air is jetted toward the mechanism chambers 15 and 16 through the non-contact airtight mechanism 6, the air mixed with fine foreign matters in the mechanism chambers 15 and 16 has a non-contact gap. Therefore, it is impossible to flow into the measuring chamber 14 side through, and it is possible to prevent the minute foreign matter from being mixed with the object to be weighed in the measuring chamber 14.

  Moreover, since air is each injected toward the measurement chamber 14 and the mechanism chambers 15 and 16 side from the air annular injection gaps 6a on both sides formed on the entire circumference in the circumferential direction, the air is injected by the injected air. A pressurized air layer is formed in the annular injection gap 6a. Therefore, the annular plate 62 attached to the tank support member 42 and the lid shaft 51 is subjected to the same pressure from both sides by the pressurized air layer, and either surface of the annular plate 62 is a partition wall. 12, 13 or the bottom surface of the annular groove 63 b is prevented, and the tank support member 42 and the annular plate 62 of the lid shaft 51 can be maintained in a non-contact state. It is possible to avoid adverse effects on the measurement due to contact with the member 42 or the lid shaft 51.

  On the other hand, in the non-contact airtight mechanism 7 having the structure shown in FIG. 6, air is supplied through the air hose 74, and the air passage 73c of the outer annular plate 73 constituting the noncontact airtight mechanism 7 from the hose connection end portion 74a. Flow into. Air enters the air supply ring 7b from there, flows in the circumferential direction in the circular path 7b and spreads, and air is supplied from air radial injection ports 7a formed at a plurality of positions in the circumferential direction, for example, at 16 equal intervals. It is ejected radially toward the measuring chamber 14 side.

  As air is jetted toward the measuring chamber 14 through the non-contact airtight mechanism 7, air mixed with fine foreign substances in the mechanism chambers 15 and 16 passes through the noncontact airtight mechanism 7 having a non-contact gap. Therefore, it is possible to prevent the minute foreign matter from being mixed with the object to be weighed in the weighing chamber 14.

  Moreover, since air is injected radially from the plurality of air radial injection ports 7a formed in the circumferential direction toward the measuring chamber 14, the inner peripheral surface of the through hole 71 and the tank are injected by the injected air. A pressurized air layer is formed in the gap formed between the support member 42 and the outer peripheral surface of the lid shaft 51. The pressurized air layer prevents the outer peripheral surfaces of the tank support member 42 and the lid shaft 51 from coming into contact with the inner peripheral surface of the through hole 71, and the tank support member 42, the lid shaft 51, the interior annular plate 72, Since the non-contact state can be maintained, adverse effects on measurement due to contact with the tank support member 42 or the lid shaft 51 through contact with the interior annular plate 72 can be avoided.

  In this way, the tank support member 42 and the lid shaft 51 that extend from the weighing chamber 14 through the partition walls 12 and 13 to the mechanism chambers 15 and 16 during weighing of the objects to be weighed supplied into the metering tank 4 are provided. Since the non-contact state with the partition walls 12 and 13 can be maintained, the object to be weighed can be normally measured.

  Then, after weighing, when the rotary actuator 54a is driven and the lower lid 5 is opened downward via the lower lid operating rod 54c and the lower lid lever 54b, the object to be weighed in the quantitative tank 4 is discharged downward, At this time, the inside of the measuring chamber 14 becomes negative pressure for a moment, and a force to suck air containing fine foreign substances acts from the surrounding mechanism chambers 15 and 16 side. By the function, the inflow can be surely prevented, and minute foreign matters can be reliably prevented from entering the air in the measuring chamber 14 from the mechanism chambers 15 and 16 side.

  On the other hand, when the supply valve 3 is taken out from the inside of the measuring chamber 14 for repair inspection, the supply valve 3 is attached to the supply valve attachment blocking plate 36. The supply valve 3 attached to the supply valve attachment blocking plate 36 is formed in the partition valve 12 when the fixing bolts are removed and the supply valve attachment closure plate 36 is removed toward the mechanism chamber 15 side. 12a can be passed and easily taken out to the mechanism chamber 15 side.

  Conversely, when the supply valve 3 is attached to a predetermined location inside the measuring chamber 14, the supply valve 3 attached to the supply valve attachment blocking plate 36 is opened from the mechanism chamber 15 side to the partition 12. It can be easily performed by inserting it toward the take-out inlet 12a and fixing the supply valve mounting closing plate 36 to the partition wall 12 with a bolt or the like.

  Furthermore, when finely adjusting the gap between the lower end of the hopper 2 and the supply valve 3 according to the particle size of the object to be weighed, the supply valve mounting closing plate 36 on one side is vertically and horizontally shifted with respect to the partition wall 12. The adjustment can be easily performed only by fine adjustment.

  The present invention is not limited to the embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Automatic metering device 11 Housing | casing 12 Bulkhead 12a Supply valve taking in / out port 13 Bulkhead 14 Measuring chamber 15 Mechanism chamber 16 Mechanism chamber 2 Hopper 21 External hopper 3 Supply valve 31 Concave circular bottom plate 31a Low wall 32 Cantilever side plate 32a Bracket 33 Supply valve shaft 33a Valve shaft rotation detector 33b Detector mounting plate 33c Timing pulley 33d Timing belt 34 Main valve bearing 34a Valve seat 35 Sub valve bearing 36 Supply valve mounting closing plate 36a Long hole 37 Supply valve mounting reinforcing plate 38 Valve shaft contact through cylinder Hole 38a Annular stopper piece 39 Drive mechanism 39a Reduction gear 39b Motor 4 Metering tank 41 Splash prevention plate 42 Tank support member 43 Weight detector 43a Detection suspension rod 43b Detection base 44 Guide rod 5 Lower lid 51 Lid shaft 52 Bearing 53 Suspension Plate 54 Drive mechanism 54a Rotary actuator Data 54b Lower lid lever 54c Lower lid operating rod 6 Non-contact airtight mechanism 6a Air annular injection gap 6b Air supply passage 61 Through hole 62 Annular plate 63 Exterior annular plate 63a hole 63b Annular groove 63c Annular groove for air pressure adjustment 63d Communication Groove 63e Air passage 64 Air hose 64a Hose connection end 7 Non-contact airtight mechanism 7a Air radial injection port 7b Air supply passage 71 Through hole 72 Interior annular plate 72a Central hole 73 Exterior annular disc 73a Hole 73b Annular groove 73c Air passage 74 Air hose 74a Hose connection end

Claims (4)

The outer side is enclosed by a box-shaped housing, the inside of the housing is partitioned into a measuring chamber and a mechanism chamber by a partition, and a hopper serving as a passage for receiving an object to be weighed from the outside is provided on the upper side of the measuring chamber, A radial gate type supply valve that adjusts the volume of the object to be weighed is provided at the lower end, a metering tank for measuring the object to be weighed is placed below the supply valve, and a lower lid that opens downward is attached to the bottom of the metering tank The both sides of a tank support member that supports the fixed quantity tank sandwiched from the front and rear sides are extended to the mechanism chamber side through the partition wall, and both sides of the lid shaft that is arranged in parallel with the tank support member on the top and bottom sides A weight detector that weighs an object to be weighed through both sides of the tank support member, the bearings of the tank support member and the lid shaft, and a supply valve. And a drive plate for the lower lid, and a suspension plate for suspending the lid shaft on the tank support member The inflow of air from the mechanism chamber to the measurement chamber is injected into the location of the partition wall through which the tank support member and the cover shaft penetrate in a non-contact manner and in a non-contact state with the tank support member and the cover shaft. An automatic metering device, characterized in that a non-contact airtight mechanism for blocking through is provided. The outer side is enclosed by a box-shaped housing, the inside of the housing is partitioned into a measuring chamber and a mechanism chamber by a partition, and a hopper serving as a passage for receiving an object to be weighed from the outside is provided on the upper side of the measuring chamber, A cantilevered radial gate type supply valve that adjusts the volume of the object to be weighed is provided at the lower end, and a metering tank for measuring the object to be weighed is arranged below the supply valve, and opens downward below the metering tank. A lower lid is attached, a supply valve outlet is formed in the partition wall on the cantilever support side of the supply valve, the supply valve outlet is detachably closed with a supply valve mounting closing plate, and connected to the cantilever support side of the supply valve. The other end of the supply valve shaft passes through the supply valve mounting block plate and extends into the mechanism chamber, and the outer periphery of the supply valve shaft is in close contact with the inner periphery of the supply valve mounting block plate A cylindrical valve shaft contact through cylinder hole that penetrates the Both sides of the tank support member to be held are extended to the mechanism chamber side through the partition wall, and both sides of the lid shaft arranged parallel to the tank support member vertically are passed through the partition wall to the mechanism chamber side. A weight detector that extends and weighs an object to be weighed through both sides of the tank support member, the bearing of the supply valve shaft, the tank support member, and the cover shaft, each of the supply valve and the lower cover. A drive mechanism and a suspension plate for suspending the lid shaft on the tank support member are disposed, and the tank support member and the lid shaft penetrate through the tank support member and the lid shaft in a non-contact state in a non-contact state with the tank support member and the lid shaft. An automatic metering device comprising a non-contact airtight mechanism for blocking air flow from the mechanism chamber to the metering chamber through air injection. The non-contact airtight mechanism is composed of an outer annular plate and an annular plate attached in a non-contact state between an annular groove and a partition formed in the outer annular plate, and the annular plate includes a tank support member and The automatic metering device according to claim 1 or 2, wherein an air annular injection gap is formed between the annular plate, the annular groove, and the partition wall. The non-contact airtight mechanism is composed of an outer annular plate and an inner annular plate that is attached to be engaged with an annular groove formed in the outer annular plate, and the hole diameter is larger than the outer diameter of the tank support member and the lid shaft. On the peripheral side of the central hole of the interior annular plate that is in a non-contact state, there are a plurality of air radial injection ports that are inclined toward the center of the central hole and toward the measuring chamber side in the circumferential direction of the central hole. The automatic weighing device according to claim 1 or claim 2, wherein a plurality of intervals are formed.

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