JP2006038720A - Combinational balance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combinational balance superior in resistance to dust while suppressing effects to measurement accuracy. <P>SOLUTION: The combinational balance comprises a casting hopper 1 having a casting opening 1A formed at its upper end and a plurality of bottom openings 1B formed at its lower end; an opening and closing device 3 for opening and closing the bottom openings 1B; a plurality of measuring hoppers 4 each installed below the bottom openings 1B; a collective chute 6 arranged below the measuring hoppers 4 for collectively discharging objects to be measured discharged from the measuring hoppers 4; a base frame 10 for supporting the casting hopper 1, the measuring hoppers 4, and the collective chute 6; and a wall body 2 formed in such a way as to surround the space between the bottom openings 1B of the casting hopper 1 and the upper end of the collective chute 6 and that its upper edge may be joined to the casting hopper 1 and that its lower edge may be jointed to the collective chute 6. The bottom openings 1B and the measuring hoppers 4 are arranged in an isolated space S isolated from the outside by the casting hopper 1, the collective chute 6, and the wall body 2. The combinational balance has a connection path 20A connecting the isolated space S to the inside of the casting hopper 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a combination weigher. More specifically, the present invention relates to a combination weigher that prevents leakage of dust to the outside.

  The combination weigher has a plurality of weighing hoppers for weighing the objects to be weighed. The combination weigher calculates a combined value obtained by adding the weighing values of the weighing hoppers out of the plurality of weighing hoppers. A device that weighs an object to be weighed close to a target weight value by discharging the object to be weighed by a weighing hopper that can obtain a combination value closest to the value.

In such a combination weigher, the object to be weighed is dropped and weighed. Therefore, when the object to be weighed is a granular material or a dust-rich material, the measurement accuracy is increased by the generation of dust from the object to be weighed. Various problems such as an influence on the load and an increase in the maintenance burden of the combination weigher arise. More specifically, it is generation of a measurement error due to dwell of dust in a combination scale or inflow of accumulated dust. Therefore, in the conventional combination weigher, the bottom of the base frame supporting the components of the combination weigher to the input hopper located at the upper end of the combination weigher is covered with a dust collection chamber, and the inside of the dust collection chamber is collected with a dust collector. Thus, it is common to prevent dust from being measured (for example, see Patent Document 1). In addition, an input hopper for temporarily depositing objects to be weighed from an input port of the combination weigher, a weighing hopper for weighing objects to be weighed, and an object to be weighed discharged from each weighing hopper are collected and discharged. There has been proposed a method of providing dust generation preventing means, for example, a dustproof bellows, for preventing dust from being measured between components of a combination weigher such as a collecting chute (see Patent Document 2 and Patent Document 3).
Japanese Utility Model Publication No. 62-111525 JP 2003-130719 A Japanese Utility Model Publication No. 61-112235

  However, the method using the dust collection chamber is not preferable because a change in the air pressure in the dust collection chamber caused by the use of the dust collector may affect the measurement accuracy. On the other hand, the dust collection chamber accommodates the entire combination weigher or is joined to the base frame to cover the entire combination weigher, so that dust may accumulate on the base frame or slip through the base frame unless a dust collector is used. There was a risk of dust leaking outside. In addition, the maintenance of the combination weigher is unsuitable for practical use because the dust collection chamber must be removed and attached each time.

  On the other hand, in the method of attaching a flexible connecting member such as a bellows between the components of the combination weigher, the weighing hopper receives stress from other components via the connecting member, and dust adheres to the bellows. As it accumulates, there is a problem that the influence cannot be ignored depending on the measurement accuracy.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a combination weigher that is excellent in dustproofness while suppressing the influence on measurement accuracy.

  In order to solve the above-mentioned problems, a combination weigher according to the present invention includes a charging hopper having a charging port formed at the upper end and a plurality of bottom opening ports formed at the lower end, and an opening / closing tool for opening and closing the bottom opening. A plurality of weighing hoppers installed below each of the bottom openings, and a collection chute disposed below the weighing hopper and collectively discharging the objects to be weighed discharged from the weighing hoppers, Surrounds the space between the charging hopper, the weighing hopper and the base frame that supports the collecting chute, and the bottom opening of the charging hopper and the upper end of the collecting chute, and the upper edge is joined to the charging hopper And the bottom edge and the weighing hopper are formed by the charging hopper, the collecting chute and the wall body, and the outer edge is formed so that the lower edge is joined to the collecting chute. It is arranged in the isolated isolated space and, a combination weigher having a communication passage for communicating the isolated space and the hopper inside (claim 1). On the outer surface of the charging hopper, a through hole is formed in a portion surrounded by the wall body, covers the through hole, extends upward, and forms an open end in the vicinity of the charging port. Preferably, a duct is provided on the inner surface of the charging hopper, and the through hole and the internal space of the duct form the communication path. With this configuration, the space in which dust is generated, that is, the space where the open bottom opening and the weighing hopper are arranged is an isolation space, and the separation that occurs when an object to be weighed is supplied from the input hopper to the weighing hopper. Since the pressure inside the space and the pressure inside the charging hopper can be balanced via the communication path, it prevents dust from leaking to the outside and improves dustproofness. It can be suppressed.

  The object to be weighed is a granular material, and an umbrella is provided on the inner surface of the charging hopper so that the front of the open end is blocked from the upper side to the lower side or diagonally downward, and the lower end of the open end is the umbrella An elevation angle or depression angle is formed with respect to the lower end of the powder, and the elevation angle is preferably configured to be less than the angle of repose of the granular material (Claim 3). With this configuration, the granular material supplied from the inlet is deposited at an angle of repose starting from the lower end of the umbrella in the vicinity of the umbrella. It is prevented that the granular material flows.

  Furthermore, it is preferable that a check valve that opens only in the inward hopper direction is provided at the open end. If comprised in this way, since it can suppress that a granular material leaks out in the isolation | separation space from the injection hopper, it will become possible to further suppress the influence on measurement accuracy.

  The wall body may be configured by a part of the base frame, and the isolation space may be formed by the input hopper, the collecting chute, and the base frame. The through hole is formed in a portion of the outer surface of the charging hopper surrounded by the base frame, covers the through hole, extends upward, and forms an open end in the vicinity of the charging port. Thus, it is preferable that a duct is provided on the inner surface of the charging hopper, and the through hole and the internal space of the duct form the communication path. With this configuration, the base frame that supports the input hopper can be completely eliminated from the isolated space, so that the accumulation of dust on structures such as the base frame is further suppressed, and the influence on measurement accuracy is further suppressed. It becomes possible to do.

  As described above, the combination weigher according to the present invention has an effect of being excellent in dustproofness while suppressing the influence on the measurement accuracy.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing a combination weigher according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG.

  As shown in FIGS. 1 and 2, the combination weigher includes a charging hopper 1, a base frame 10, a collecting chute 6, an opening / closing tool 3, a weighing hopper 4, a weight sensor 5, a vibrator 8, and a cover ( Wall body) 2 and a collective chute support 11.

  As shown in FIG. 2, the base frame 10 includes an upper frame 10A made of a cylindrical body, a lower frame 10B that is a pedestal, and a beam 10E that joins the upper frame 10A and the lower frame 10B.

  As shown in FIG. 2, the upper frame 10 </ b> A is a cylindrical body having an upper end opened and a lower end closed. And it is supported by the beam 10E from the circumference | surroundings with the central axis turned up and down. A plurality of weight sensors 5 are installed in the upper frame 10A corresponding to the number of weighing hoppers. Here, the weight sensor 5 is installed at the bottom of the upper frame 10A.

  As shown in FIG. 1, the lower frame 10B is a pedestal that supports the combination weigher. Specifically, the upper frame 10A is supported via the beam 10E, and the collective chute 11 is supported via the collective chute support 11.

  As shown in FIG. 1, at least one beam 10E is extended from the lower frame 10B so as to support the bottom of the upper frame 10A from the front, rear, left and right directions of the upper frame 10A. Has been. As a result, a space penetrating in the vertical direction can be formed between the upper frame 10A and the lower frame 10B. Therefore, a plurality of weighing hoppers 4 and collecting chutes 6 are arranged around and below the upper frame 10A. By doing so, it is possible to secure a space in which the object to be weighed moves in the vertical direction.

  The weight sensor 5 includes a load cell. A connecting tool 5A is connected to each weight sensor 5, and the connecting tool 5A penetrates the peripheral wall of the upper frame 10A and is connected to the weighing hopper 4 on the outer wall side of the upper frame 10A. That is, the plurality of weighing hoppers 4 are installed so as to surround the outside of the upper frame 10A. The connecting tool 5A and the through-hole of the peripheral wall are configured so as to have a minute gap so as to prevent the dust from leaking while preventing the measurement accuracy from being affected. As a result, the change in the weight of each weighing hopper 4 is transmitted to the weight sensor 5 via the connecting tool 5A, so that the weight of the object to be weighed in each weighing hopper 4 can be detected by each weight sensor 5. Here, three weighing hoppers 4 are installed between the beams 10E, and a total of 12 weighing hoppers 4 are installed around the upper frame 10A.

  As shown in FIG. 2, the charging hopper 1 is formed in a hollow substantially truncated cone shape, and has a top surface opened and a bottom surface closed. An inlet 1A is formed on the opened top surface. The center part of the bottom wall is formed in a conical shape, and a plurality of guide cylinders extend downward so as to surround the outer part. A bottom opening 1B is formed at the lower end of the guide tube. The same number of bottom openings 1B as the weighing hoppers 4 are formed. The charging hopper 1 is joined such that the center portion of the bottom wall is placed on the upper end of the upper frame 10 </ b> A of the base frame 10. The bottom opening 1 </ b> B is configured to be positioned above the weighing hopper 4. Further, a convex portion 1C is formed on the outer peripheral surface of the charging hopper 1 at intervals in the circumferential direction or over the entire circumference. Thereby, the positioning at the time of joining the charging hopper 1 and the cover 2 can be facilitated.

  Further, as shown in FIG. 2, a through-hole 1 </ b> D is formed in the peripheral wall of the charging hopper 1 near the lower portion near the joint portion between the charging hopper 1 and the cover 2. A duct member 20 having a U-shaped cross section is installed on the inner surface of the charging hopper 1. The duct member 20 is installed so as to cover the through hole 1D and extend upward. A communication passage 20 </ b> A is formed by the inner surface of the charging hopper 1 and the duct member 20, and an open end 20 </ b> B is formed at the upper end of the duct member 20. In front of the open end 20B, a flat umbrella 1E extending from above to below or obliquely below is installed on the inner surface of the charging hopper 1. Here, in the umbrella 1E, the lower end 20C of the open end 20B forms an elevation angle α with respect to the lower end of the umbrella 1E. When the object to be weighed is a granular material, the elevation angle α is set to be less than the angle of repose of the granular material. As a result, the front of the open end 20B is blocked by the umbrella 1E, and the particulate matter accumulated in the charging hopper 1 leaks through the communication passage 20A into the space (isolation space S) where the weighing hopper 4 exists. Can be prevented.

  The opening / closing tool 3 is installed so as to be able to adjust the flow rate of the object to be weighed to the weighing hopper 4 by opening and closing the respective bottom opening 1B.

  Since the opening / closing tool 3 and the weighing hopper 4 are installed as described above, the weight sensor 5 and its attached devices do not become an obstacle when approaching the opening / closing tool 3 and the weighing hopper 4 from the outside. Inspection and attachment / detachment of the opening / closing tool 3 and the weighing hopper 4 are facilitated, and maintenance of the combination weigher is facilitated.

  The cover 2 is a cylindrical body that is installed so as to surround the outer periphery of the opening / closing tool 3 and the weighing hopper 4. More specifically, the upper end of the cover 2 surrounds the periphery of the input port 1 </ b> A and is joined to the input hopper 1. Further, as shown in FIG. 2, the upper end of the cover 2 is installed so as to engage with the convex portion 1C on the outer peripheral surface of the charging hopper 1. A seal member 2A such as a rubber packing is disposed at the upper end of the cover 2 over the entire circumference. As a result, the charging hopper 1 and the cover 2 are hermetically joined via the seal member 2A, so that leakage of dust to the outside can be prevented. Here, as shown in FIG. 1, the cover 2 is divided into a plurality of wall members in the circumferential direction, and the plurality of wall members are integrated by a fastener 13. This eliminates the need for a special tool for attaching and detaching the cover 2, thereby facilitating maintenance of internal structures such as the opening / closing tool 3 and the weighing hopper 4. Here, the fasteners 12 to 16 (see Embodiment 2) used in the present invention are general fasteners that can be easily attached and detached, for example, a buckle using a spring force. .

  As shown in FIG. 1, the collecting chute 6 is a funnel-shaped member having a discharge port 6 </ b> A formed at the bottom. The collective chute 6 is installed below the weighing hopper 4 and supported by the collective chute support 11 such that the upper end of the collective chute 6 and the lower end of the cover 2 are in contact with the discharge port 6A downward. Yes.

  The collective chute support 11 is a beam-like member processed so as to support the outer surface of the collective chute 6, and is fixed to the base frame 10 by bolts and nuts (not shown). Thereby, the objects to be weighed discharged from the weighing hopper 4 can be collectively guided to the discharge port 6A.

  Here, the space in which dust is generated, that is, the space in which the opening / closing tool 3 and the weighing hopper 4 are arranged, as shown in FIG. Therefore, it is possible to prevent the dust from leaking to the outside. Further, since the constituent members of the base frame 10 are excluded from the isolation space S except for the beam 10E, accumulation of dust on the structure in the isolation space S is suppressed.

  Here, as shown in FIG. 1, at least one fastener 12 is installed between the upper end outer surface of the collective chute 6 and the lower end outer surface of the cover 2 so as to join the upper end of the collective chute 6 and the lower end of the cover 2. Has been. Thereby, the joining of the upper end of the collective chute 6 and the lower end of the cover 2 can be ensured. Moreover, although not shown in figure, the sealing surfaces, such as elastic rubber, are interposed in the joining surface of the upper end of the collective chute 6 and the lower end of the cover 2, and it is comprised so that both may be joined reliably. In general, an external device (not shown) for processing a weighed object such as a packaging device is joined to the discharge port 6A.

  At least one of the vibrators 8 is attached to the outer surface of the collective chute 6. As a result, the vibration of the vibrator 8 vibrates the collective chute 6, so that dust can be prevented from adhering and staying on the inner surface of the collective chute 6. As the vibrator 8, a commercially available vibrator can be used. Here, the UCV type made by MARTIN ENGINEERING is used.

  Although not shown, the combination weigher has a control device, and the opening / closing tool 3, the weighing hopper 4, and the vibrator are opened / closed or driven by their respective drive mechanisms (not shown) based on commands from the control device. It oscillates.

  Next, the operation of the combination weigher of the first embodiment configured as described above will be schematically described.

  An object to be weighed is supplied from the input port 1A, and the object to be weighed is deposited in the input hopper 1.

  The objects to be weighed deposited in the charging hopper 1 are supplied to the weighing hopper 4 by a predetermined amount by the opening / closing tool 3 at each open bottom opening 1B.

  The object to be weighed supplied to the weighing hopper 4 is weighed (weighed) by the weight sensor 5. Here, when an object to be weighed is supplied to the weighing hopper 4, a part of the air in the isolation space S is pushed out from the through hole 1 </ b> D into the communication path 20 </ b> A or into the charging hopper 1. As a result, pressure fluctuations in the charging hopper 1 and the isolation space S are suppressed, and the influence on the weighing accuracy can be suppressed. That is, when an object to be weighed in the charging hopper 1 is supplied to the weighing hopper 4, the charging hopper 1 has a negative pressure and the isolation space S has a positive pressure. This is because when air flows through the communication path 20A, excess and deficiency of air in the charging hopper 1 and the isolation space S is offset, and pressure fluctuations in the isolation space S are suppressed. Further, since air does not circulate to the outside, there is no risk of dust leaking outside.

  The control unit (not shown) of the combination weigher determines a combination of a plurality of measurement values that are closest to the target value among the measurement values of all the measurement hoppers 4, and the plurality of combination measurement hoppers 4 is opened.

  The objects to be weighed released from the weighing hopper 4 are guided to the collecting chute 6 and discharged from the discharge port 6A. At this time, since the collective chute 6 vibrates by the vibrator 8, it is suppressed that dust stays in the collective chute 6.

  Then, the objects to be weighed are refilled in the weighing hopper 4 which has been discharged and empty, and all the weighing hoppers 4 are again weighed, and the above weighing operation is repeated.

(Embodiment 2)
FIG. 3 is a perspective view schematically showing a combination weigher according to Embodiment 2 of the present invention. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. Constituent elements that are the same as those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted. Further, the operation of the combination weigher of the second embodiment is the same as the operation of the combination weigher of the first embodiment, and the description thereof is omitted.

  The difference between the combination weigher in the present embodiment and the combination weigher in FIG. 1 is as follows.

  As shown in FIG. 3, the base frame 10 includes an upper frame 10C and a lower frame 10D.

  The lower frame 10 </ b> D is a pedestal having an opening at the center, and the weight sensor 5 is arranged in parallel around the opening. Here, the lower frame 10 </ b> D is opened in a rectangular shape, and the weight sensors 5 are installed in rows on both sides of the opposed opening edge. That is, the weight sensors 5 are installed in two rows with the opening portion in between. And the weighing hopper 4 connected to the weight sensor 5 is installed in the opening via the connecting tool 5A. That is, the weighing hoppers 4 are arranged in two rows and installed in the openings.

  The upper frame 10C is a rectangular tubular body extending upward from the opening edge of the lower frame 10D, and the connecting tool 5A penetrates the peripheral wall of the tubular portion. That is, the upper frame 10 </ b> C is configured to surround the space in which the opening / closing tool 3 and the weighing hopper 4 are disposed. The connecting tool 5A and the through-hole of the peripheral wall are configured so as to have a minute gap so as to prevent the dust from leaking while preventing the measurement accuracy from being affected. Here, the peripheral wall is composed of four wall bodies.

  Further, as shown in FIG. 3, the upper frame 10 </ b> C is configured by joining wall members having four surfaces by fasteners 16. As a result, it is possible to attach and detach a part of the wall member of the upper frame 10C by opening and closing the fasteners 14, 15 and 16, and since no special tool is required for the attachment and detachment, the opening and closing tool 3, the weighing hopper 4, etc. The access to the internal structure is facilitated, and maintenance of the combination weigher is facilitated.

  The upper frame 10C and the lower frame 10D are joined as shown in FIG. That is, the lower frame 10D has a peripheral wall with a height up to the connecting tool 5A protruding from the opening edge. The upper frame 10C is installed on the peripheral wall, and the upper frame 10C and the lower frame 10D are attached by the fastener 15. Are joined. That is, the lower frame 10 </ b> D and the upper frame 10 </ b> C are configured to be divided using the connecting tool 5 </ b> A as a boundary. Note that the end face where the lower frame 10D and the upper frame 10C are joined is formed so that the concave portion and the convex portion are fitted, although not shown. Thereby, positioning at the time of joining and improvement of joining strength can be aimed at.

  The charging hopper 1 is joined to the upper end of the upper frame 10C. Here, as shown in FIG. 4, a convex portion 1 </ b> C is formed over the entire outer peripheral surface of the charging hopper 1. Then, the upper end of the upper frame 10 </ b> C is positioned by contacting the convex portion 1 </ b> C, and is joined by at least one fastener 14. Further, the projecting portion 1C is provided with a seal member 1F on the joint surface with the upper end of the upper frame 10C. As a result, the charging hopper 1 and the upper end of the upper frame 10C are hermetically joined via the seal member 1F, so that leakage of dust to the outside can be prevented.

  The bottom opening 1B of the charging hopper 1 is formed such that each bottom opening 1B is positioned above each weighing hopper 4 when the charging hopper 1 is joined to the upper frame 10C.

  Further, as shown in FIG. 4, a through-hole 1 </ b> D is formed in the peripheral wall of the charging hopper 1 in the lower part near the joining portion between the charging hopper 1 and the cover 2. A duct member 20 having a U-shaped cross section is installed on the inner surface of the charging hopper 1. The duct member 20 is installed so as to cover the through hole 1D and extend upward. A communication passage 20 </ b> A is formed by the inner surface of the charging hopper 1 and the duct member 20, and an open end 20 </ b> B is formed at the upper end of the duct member 20. A flat umbrella 1E extending from the upper side to the lower side is installed on the inner surface of the charging hopper 1 in front of the open end 20B. Here, the umbrella 1E is installed such that the lower end 20C of the open end 20B forms a depression angle β with respect to the lower end of the umbrella 1E. Further, the check valve 21 is installed at the open end 20B so that the valve is opened only when the check valve 21 flows from the upper frame 10C side to the closing hopper 1 side. Here, an elastic body piece such as rubber is used for the check valve 21. The main surface of the elastic piece 21 is pressed against the open end 20B so that the end face of the elastic piece 21 is joined to the inner surface of the charging hopper 1. As a result, the front of the open end 20B is blocked by the umbrella 1E, and the open end 20B is blocked by the check valve 21, so that when the object to be weighed is a granular material, it accumulates in the charging hopper 1. It is possible to prevent the powder particles from leaking into the space (isolation space S) where the weighing hopper 4 exists through the communication path 20A.

  As shown in FIG. 4, the collective chute 6 is joined to the lower surface around the opening of the lower frame 10 </ b> D by a fastener 12. As a result, the collective chute 6 can collectively guide the objects to be weighed discharged from the weighing hopper 4 to the discharge port 6A, and can be easily attached and detached without requiring a special tool. Maintenance becomes easier.

  With this configuration, the edge portions of the opening portions of the upper frame 10C and the lower frame 10D constitute a member corresponding to the cover 2 in the first embodiment. And the space where dust is generated, that is, the space where the opening / closing tool 3 and the weighing hopper 4 are arranged here is the charging hopper 1, the upper frame 10C, the lower frame 10D (more precisely, the opening surface of the lower frame 10D). And the isolation space S isolated from the outside by the collective chute 6. Since the constituent members of the base frame 10 such as the beam 10E in the first embodiment are excluded from the isolation space S, it is possible to further suppress the accumulation of dust, and further suppress the decrease in measurement accuracy due to the fall of the deposit. Can be planned.

  INDUSTRIAL APPLICABILITY The present invention is useful as a combination weigher type combination weigher that is excellent in dustproofness while suppressing the influence on weighing accuracy.

1 is a perspective view schematically showing a combination weigher according to Embodiment 1 of the present invention. It is a front view in the II-II plane cross section of FIG. It is a perspective view which shows roughly the combination balance which concerns on Embodiment 2 of this invention. 3 is a side view of the IV-IV plane cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input hopper 1A Input port 1B Open bottom port 1C Protruding part 1D Through-hole 1E Umbrella 1F Seal member 2 Cover 2A Seal member 3 Opening and closing tool 4 Weighing hopper 5 Weight sensor 5A Connecting tool 6 Collecting chute 6A Discharge port 8 Vibrator 10 Base frame 10A 10C Upper frame 10B, 10D Lower frame 10E Beam 11 Collective chute support 12, 13, 14, 15, 16 Fastener 20 Duct member 20A Communication path 20B Open end 20C Lower end 21 Check valve S Isolation space

Claims (6)

A charging hopper having a charging port formed at the upper end and a plurality of open bottom ports formed at the lower end;
An opening and closing tool for opening and closing the bottom opening;
A plurality of weighing hoppers installed below each of the bottom openings;
A collecting chute that is disposed below the weighing hopper and discharges the objects to be weighed discharged from the weighing hopper together;
A base frame that supports the charging hopper, the weighing hopper, and the collecting chute;
Surrounding the space between the bottom opening of the charging hopper and the upper end of the collecting chute, the upper edge is joined to the feeding hopper, and the lower edge is joined to the collecting chute A wall body,
A combination weigher in which the open bottom opening and the weighing hopper are arranged in an isolation space formed by the charging hopper, the collecting chute and the wall body and isolated from the outside;
A combination weigher having a communication path communicating the isolation space with the inside of the charging hopper. On the outer surface of the charging hopper, a through hole is formed in a portion surrounded by the wall body,
A duct is provided on the inner surface of the charging hopper so as to cover the through hole, extend upward, and form an open end in the vicinity of the charging port, and the through hole and the internal space of the duct are connected to each other. The combination weigher according to claim 1, which forms a passage. The object to be weighed is a granular material,
An umbrella is provided on the inner surface of the charging hopper so as to block the front of the open end from the upper side toward the lower side or the diagonally lower side,
The combination weigher according to claim 2, wherein a lower end of the open end forms an elevation angle or a depression angle with respect to a lower end of the umbrella, and the elevation angle is configured to be less than a repose angle of the granular material.   The combination weigher according to claim 3, further comprising a check valve that opens only in an inward direction of the charging hopper at the open end. The wall is constituted by a part of the base frame,
The combination weigher according to claim 1, wherein the isolation space is formed by the charging hopper, the collecting chute, and the base frame. The through hole is formed in a portion of the outer surface of the charging hopper surrounded by the base frame,
A duct is provided on the inner surface of the charging hopper so as to cover the through hole, extend upward, and form an open end in the vicinity of the charging port, and the through hole and the internal space of the duct are connected to each other. 6. The combination weigher according to claim 5, forming a passage.

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