JP3836351B2 - Weighing device and combination weighing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a weighing device and a combination weighing device.
[0002]
[Prior art and its drawbacks]
Conventionally, as a waterproof structure using a diaphragm of a weighing device, there are many structures that sandwich the inner peripheral edge of the diaphragm. However, in such a structure, when the weighing device is washed with water, the edge of the diaphragm is detached by water pressure, soaks in the main body, causing a failure. Also, when water droplets are blown off after washing with water, the inner peripheral edge of the diaphragm is released by the pressure of the air.
[0003]
On the other hand, in the waterproof structure disclosed in Japanese Utility Model Publication No. 3-36895, the diaphragm is screwed. However, in this structure, it is necessary to form a large number of holes in the diaphragm for allowing the screws to pass therethrough, which causes an increase in cost. Furthermore, the hole portion causes the diaphragm to be broken, and this causes a decrease in waterproofness.
[0004]
Accordingly, an object of the present invention is to improve the waterproofness by preventing the diaphragm from coming off in the weighing device using the diaphragm.
[0005]
[Means for Solving the Problems]
To achieve the above object, the metering device of the present onset Ming supports the article holding portion to the connecting member projecting from the weight detector, the connecting member passes through the through-hole of the apparatus main body, the connecting In a weighing device in which a space between an outer peripheral edge of a member and an inner peripheral edge of a through hole in the main body is waterproofed by a diaphragm, the outer peripheral edge of the diaphragm is fitted in the through hole in the main body. An outer peripheral ring is integrally provided on the diaphragm main body, and an inner peripheral ring engaging with the connecting member is integrally provided on the diaphragm main body at the inner peripheral edge of the diaphragm, and both the outer peripheral ring and the inner peripheral ring are provided. Is made of a material having a rigidity higher than that of the diaphragm body, and is made of a material different from that of the diaphragm body .
[0006]
According to inventions of this, the diaphragm body receives the pressure and the air pressure at the time of washing, the outer peripheral edge of the diaphragm is held without displacement in the radial direction with respect to the main unit by rigid peripheral ring. On the other hand, the inner peripheral edge of the diaphragm is connected to the connecting member via a highly rigid inner peripheral ring and held so as not to come off.
[0007]
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[0008]
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[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described using a combination weighing device as an example.
Schematic configuration:
1 to 4 show an embodiment of the present invention .
First, an example of general functions and operations of the combination weighing device will be described.
As shown in FIG. 1, the transport conveyor 100 drops an item M, which is an object to be weighed, onto the central portion of the dispersion feeder 2 of the combination weighing device 1. Note that several or many items M are collected and then packed into a product.
[0010]
The dispersion feeder 2 and the supply troughs 3i are each vibrated by driving of a vibration exciter, thereby supplying the articles M on the dispersion feeder 2 to a number of pool hoppers 4i provided downstream of the supply troughs 3i. Each of these pool hoppers 4i is provided with a gate 5i, and temporarily stores and stores the goods M supplied and received from the supply troughs 3i. A weighing hopper (item holding unit) 6i is provided downstream of each pool hopper 4i. Each of these weighing hoppers 6i is provided with a weighing head and a gate 8i provided with a weight detector 7i for detecting the weight of an article M put into the weighing hopper 6i from the pool hopper 4i. A large collective discharge chute 9 is provided below the gate 8i. By combining the weights of the items M detected by the respective weight detectors 7i, the items M are put together and close to a target value or a target value. The product M is dropped to a downstream bag making and packaging machine (not shown).
[0011]
Weighing hopper:
The weighing hopper 6 i shown by a two-dot chain line in FIG. 2 is attached to the hanger member 11 via a bracket 10. On the other hand, the weight detector 7 i is fixed to the apparatus main body 50 through a bracket 51 having a “U” cross section. The side surface of the weight detector 7 i is covered with a cover 52 of the apparatus main body 50. A through hole 15 is formed in the cover 52 of the apparatus main body 50. The connecting member 12 protruding from the weight detector 7 i passes through the through hole 15 in the vertical direction Y. The connecting member 12 includes a first divided portion 13 and a second divided portion 14 that are divided vertically.
[0012]
The hanger member 11 is attached to the second divided portion 14 of the connecting member 12 via two engagement pins 16. Therefore, the weighing hopper 6i is attached to the lower end side of the connecting member 12 via the bracket 10 and the hanger member 11, and the load is applied to the weight detector 7i.
[0013]
Diaphragm:
An annular diaphragm 20 is provided between the inner peripheral edge 17 of the through-hole 15 and the outer peripheral edge 18 of the connecting member 12 in FIG.
As shown in FIGS. 3A and 3B, the diaphragm 20 is integrally provided with an outer peripheral ring 22 at the outer peripheral edge portion of the diaphragm main body 21. A sandwiched portion 23 is formed on the inner peripheral edge of the diaphragm body 21, and an inner ring 24 </ b> A that projects in the axial direction Y is integrally provided on the sandwiched portion 23. That is, the diaphragm 20 is different from the conventional diaphragm 200 shown in FIG. 3C in that an inner peripheral ring 24A is integrally provided on the sandwiched surface 23 at the inner peripheral edge. As shown in FIG. 3B, the sandwiched portion 23 of the diaphragm 20 is provided with irregularities for improving the holding force, sealing performance, etc. of the diaphragm 20.
[0014]
The two rings 22 and 24A are made of, for example, an iron-based metal. The diaphragm 20 can be formed easily by insert-molding the previously formed outer ring 22 and inner ring 24A at the boundary between the diaphragm body 21 and an adhesive.
[0015]
Connecting member:
As shown in FIG. 4B, the connecting member 12 sandwiches a sandwiched portion 23 at the inner peripheral edge of the diaphragm 20 between the two divided portions 13 and 14. A shallow concave portion 14 a is provided on the upper end surface of the second divided portion 14, and a convex portion 13 a that fits into the concave portion 14 a is provided on the first divided portion 13. Around the concave portion 14a and the convex portion 13a, annular sandwiching surfaces (divided surfaces) 14b and 13b that face each other via the sandwiched portion 23 of the diaphragm 20 are formed. An annular engagement groove 13 c into which the inner ring 24 </ b> A of the diaphragm 20 is fitted is formed on the outer peripheral edge of the first divided portion 13.
[0016]
The inner circumferential ring 24A of the diaphragm 20 is fitted into the engagement groove 13c, whereby the inner circumferential ring 24A is engaged with the connecting member 12 in the radial direction. Further, as shown in FIG. 4A, when the two divided portions (connecting members) 13 and 14 are connected to each other by a bolt 26, the sandwiched portion 23 of the diaphragm 20 is sandwiched.
On the other hand, as shown in FIG. 4B, the outer peripheral ring 22 of the diaphragm 20 is pushed into the cover 52 via the outer peripheral edge 25 and is fixed in a slightly compressed state.
[0017]
In the present combination weighing device, since the diaphragm 20 is provided with the outer ring 22 and the inner ring 24A formed of a highly rigid material, even if the diaphragm main body 21 receives water pressure during washing or air pressure of compressed air, There is no possibility that the outer peripheral edge and the inner peripheral edge of the diaphragm 20 are detached from the cover 52 and the connecting member 12 of the apparatus main body 50.
[0018]
In particular, in the present embodiment, since the inner peripheral ring 24A is engaged with the engagement groove 13c, it is possible to reliably prevent the diaphragm 20 from being detached from the connecting member 12.
The diaphragm 20 is an integral body in which the outer peripheral ring 22 and the inner peripheral ring 24A are integrally provided on the diaphragm main body 21, so that the number of parts and the number of assembly steps are not increased.
[0019]
Furthermore, since the diaphragm 20 is sandwiched between the two divided portions 13 and 14 of the connecting member 12, it is not necessary to provide a bolt insertion hole in the diaphragm 20. Therefore, the durability of the diaphragm 20 is improved and the processing cost of the diaphragm 20 is reduced.
Note that the engagement groove 13c may be formed in the second divided portion 14 instead of the first divided portion 13 of the first embodiment.
[0020]
FIG. 5 shows a modification of the present embodiment.
The diaphragm 20 in FIG. 5A is attached in a state where an inner ring 24 </ b> B having a U-shaped cross section is placed on the sandwiched portion 23 of the diaphragm 20. In the diaphragm 20 of FIG. 5B, the inner peripheral ring 24 </ b> C is embedded in the sandwiched portion 23.
Each of these diaphragms 20 can prevent the diaphragm 20 from being detached from the connecting member 12 because the inner peripheral rings 24B and 24C having high rigidity are fitted on the convex portions 13a of the first divided portion 13.
[0021]
In the present invention, as shown in FIG. 5C, the inner peripheral ring 24 </ b> D of the diaphragm 20 engages with the circular concave portion 14 a of the second divided portion 14 instead of the outer peripheral edge portion of the second divided portion 14. It may be.
[0022]
FIG. 6 shows a reference example useful for understanding the present invention .
As shown in FIG. 6A , in this reference example , the connecting member 12 passes through the through hole 54 provided in the apparatus main body 50, not the cover 52 (FIG. 2) of the above-described embodiment. . The outer peripheral edge of the connecting member 12 and the inner peripheral edge 19 of the through hole 54 are waterproofed (sealed) by a diaphragm 200. The diaphragm 200 is not provided with the inner peripheral ring shown in FIG. 3 (c), and the sandwiched portion at the inner peripheral edge of the diaphragm 200 is the both divided portions 13, 14 of the connecting member 12, as in the prior art. Is sandwiched between.
[0023]
In this reference example , a protective cover 27 is attached to the outside of the through hole 54 in the apparatus main body 50. The protective cover 27 covers the diaphragm 200 from the outside, so that the injection pressure of fluid such as water and air is prevented from being applied to the diaphragm 200 from the outside, and the outer peripheral portion 27b of the protective cover 27 is The device main body 50 is fixed to the outer peripheral side of the diaphragm 200. The protective cover 27 has a funnel shape having an annular inclined peripheral surface inclined from above toward a lower central portion having a small diameter, and has a through portion 29 in the central portion.
[0024]
The connecting member 12 has a small diameter portion 14d having a smaller diameter than the through portion 29 of the protective cover 27 and a large diameter portion 14e having a large diameter. The inner peripheral portion of the protective cover 27, that is, the through portion 29 is close to and separated from the small diameter portion 14 d of the connecting member 12. The inner diameter of the inner peripheral portion of the protective cover 27, that is, the hole diameter of the through portion 29 is set to a value smaller than the outer diameter of the large diameter portion 14e.
[0025]
In this reference example , the diaphragm 200 is protected by the protective cover 27 so as not to be subjected to the water pressure of water discharged during washing or the air pressure of compressed air. And since the inner peripheral part of the protective cover 27 is adjoining to the said small diameter part 14d of the connection member 12, since this part becomes a maze structure, high waterproofness is exhibited. In addition, since the clearance gap is provided between the connection member 12 and the protective cover 27, it has no influence on the measurement accuracy.
[0026]
FIG. 6B is a modification of FIG. 6A, and in FIG. 6A, the connecting member 12 protrudes vertically downward, whereas the connecting member 12 protrudes from the weight detector 7i in a substantially horizontal direction. Has been. Correspondingly, the protective cover 27 is fixed to the apparatus main body 50 in a lateral arrangement. However, the lower end of the protective cover 27 is notched, and a drain hole 30 for draining water is formed between the notch and the apparatus main body 50.
[0027]
As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the outer ring and the inner ring may be formed of a material having a rigidity (Young's modulus: longitudinal elastic modulus) greater than that of the diaphragm body. The specific material of these rings is formed of hard plastic other than metal. and even good. In general, when the Young's modulus (longitudinal elastic modulus) or rigidity (shear elastic modulus) of a material is large, the rigidity of the material is also large.
Also, in the implementation form described above has been illustrated and described a combination weighing device, the weighing device can also be applied for the metering device provided with a single hopper device.
Moreover, you may make the attachment direction of this embodiment into a horizontal direction like FIG.6 (b). That is, the connecting member may be taken out from the side surface of the main body, and the diaphragm 20 may be provided along a vertical surface.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.
[0028]
【The invention's effect】
As described above, according to this onset bright, even the diaphragm body is subjected to water pressure and air pressure at the time of washing, deviated radially inner peripheral edge portion of the diaphragm is connected to the connecting member via an inner ring high rigidity Since it is held so that it does not, waterproofness is improved.
Further, since it is not necessary to provide a bolt insertion hole in the diaphragm, the durability of the diaphragm is improved and the manufacturing cost of the diaphragm is reduced.
Further, since the outer ring and the inner ring are provided integrally with the diaphragm body, the number of parts does not increase.
[0029]
Further, if the inner ring protruded from the diaphragm body is fitted into the annular groove provided in the connecting member, the inner ring is securely engaged with the connecting member, and the radial direction of the inner ring is increased. The waterproofness is further improved because the displacement to the can is reliably prevented.
[0030]
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[0031]
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[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing functions of a combination weighing device according to an embodiment of the present invention.
FIG. 2 is a partially broken side view showing the weighing hopper device.
3A is a perspective view of a diaphragm, FIG. 3B is a sectional view taken along line AA of FIG. 3A, and FIG. 3C is a perspective view of a conventional diaphragm shown for comparison.
FIG. 4 is an enlarged side view of the weighing hopper device and a further enlarged side view of a part thereof.
FIG. 5 is a longitudinal sectional view of a main part of a modification.
FIG. 6 is a longitudinal sectional view showing a weighing hopper device of a combination weighing device according to a reference example useful for understanding the present invention , and a longitudinal sectional view showing a modification.
[Explanation of symbols]
6i: Weighing hopper (product holding part)
7i: weight detector 12: connecting member 13b, 14b: clamping surface (divided surface)
13c: Locking groove 14d: Small diameter portion 14e: Large diameter portion 15: Through hole 17: Inner peripheral edge portion of the through hole 18: Outer peripheral edge portion of the connecting member 20: Diaphragm 21: Diaphragm body 22: Outer ring 24A to 24C: Inner Circumferential ring 29: penetrating part 50: apparatus main body part Y: axial direction

Claims (4)

An article holding portion is supported by a connecting member protruding from the weight detector, the connecting member passes through a through hole of the apparatus main body, and an outer peripheral edge of the connecting member and an inner peripheral edge of the through hole in the main body. In a weighing device that is waterproofed with a diaphragm between
On the outer peripheral edge of the diaphragm, an outer peripheral ring that fits into the through hole in the device main body is integrally provided in the diaphragm main body,
On the inner peripheral edge of the diaphragm, an inner peripheral ring that engages with the connecting member is provided integrally with the diaphragm body,
Both the outer ring and the inner ring are made of a material having rigidity higher than that of the diaphragm body, and are formed of a material different from that of the diaphragm body . In claim 1,
The measuring device in which the connecting member is divided and the inner peripheral edge of the diaphragm is sandwiched between the divided parts. In claim 2,
An annular groove is formed on the dividing surface of one of the connecting members.
The inner ring protrudes from the diaphragm body in the axial direction thereof,
A metering device in which the inner ring is engaged with the connecting member in the radial direction by fitting the inner ring into the groove. A combination weighing device comprising a plurality of weighing devices according to any one of claims 1 to 3 .

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