JP2000009522A - Measuring instrument and metal detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a device having a motor in waterproof structure to prevent water from entering the motor even when washed right after operation. SOLUTION: The motor 14 of a conveyor which conveys articles is made waterproof by a waterproof cover 17. The motor 14 is connected to a control means in a housing 25 through a power supply control cable 23a and driven and controlled. Along this power supply control cable 3a, a hollow pipe 23b is provided. One end part of the hollow pipe 23b is led out in the waterproof cover 17 and the other end part is led out in the housing 25. If the device is washed for cleaning in a heating state right after the motor 14 operates, the air pressure in the waterproof cover 17 is to vary suddenly owing to quick cooling, but the air pressure variation is absorbed on the side of the housing 25 through a ventilation pipe 23b to prevent water entering the motor through a weakly waterproof part of the waterproof cover 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing device for weighing an article while transporting the article in a transport section, and a metal detector for detecting a metal object in the article while transporting the article in the transport section.

[0002]

2. Description of the Related Art A weighing apparatus weighs an article by a weighing section while transporting the article by driving a conveyor constituting a transport section. The drive roller of the conveyor is driven to rotate by a motor. The conveyor is placed on a weighing unit such as a load cell, and the weighing unit weighs the whole conveyor and the articles together,
The weighing signal is output to a calculation unit (not shown). The calculation unit obtains the mass of the article by subtracting the mass of the conveyor 51 in the calculation processing.

[0003] The weighing device is periodically cleaned,
For example, there is a configuration in which the entire apparatus can be washed from the top with water. The motor in such a water-resistant metering device is housed in a waterproof cover, the power supply and control cables are taken out through a waterproof connector, and the inside of the waterproof cover is waterproofed.

[0004]

However, even in the above-described waterproof construction, the following problems occur when the water is washed immediately after the operation of the apparatus. The internal temperature of the motor is about 110
When the temperature of the water is about 20 degrees, the motor is rapidly cooled, and the pressure in the waterproof case changes rapidly (in this case, about 1 / 1.3 times). This allows the joint of the waterproof case, the output shaft of the motor, etc.
Air enters from places that are vulnerable to changes in atmospheric pressure. Water droplets during washing often remain on these poles, causing water to enter the inside of the waterproof case.

[0005] The above-mentioned water washing is often performed immediately after the apparatus is stopped in order to increase the operating efficiency. Also, this washing
Since weighing is frequently performed when weighing food with a weighing device, it has been desired to provide a means for solving the above problem. In the above description, the weighing device has been described as an example. However, a metal detector that detects a metal object in an article is provided with a similar transport unit and a waterproof motor, and causes the same problem as described above.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in a device having a motor having a waterproof structure, a weighing device and a metal detector capable of preventing water from entering into the motor even if the device is washed immediately after operation. It is intended to provide.

[0007]

To achieve the above object, a weighing apparatus according to the present invention comprises a conveyor (3) for transporting articles, a weighing section (4) for weighing the articles, and a drive for the transport section. A waterproof cover (17) for waterproofing a motor (14) as a power source, and a control unit that is disposed at a predetermined distance from the motor and controls a rotation of the motor and accommodates a predetermined volume larger than the waterproof cover And a power supply control cable (23a) for power supply and control, which is wired and connected between the motor and the control means.
And, formed in a hollow shape, provided between the waterproof cover and the housing, one end is led out of the inside of the waterproof cover, the other end is drawn out of the housing, and the cable And a ventilation pipe (23b) disposed along the same.

[0008] According to a second aspect of the present invention, the housing (25) has a dryer (3) for drying the humidity inside.
2) is provided, and the ventilation pipe is composed of two pipes (23ba, 23bb) along the control cable, and the other end of the one ventilation pipe is connected to an air outlet (3) of a dryer.
2b), the dry air sent out from the dryer may be supplied into the waterproof cover.

Further, the metal detector of the present invention waterproofs a conveyor (3) for transporting an article, a detector for detecting a metal object in the article, and a motor (14) which is a driving source of the transporter. A waterproof cover (17), a housing (25) which is disposed at a predetermined distance from the motor and accommodates control means for controlling rotation of the motor, and has a predetermined volume larger than the waterproof cover; A power supply control cable (23a) for power supply and control wired and connected between the motor and the control means; formed in a hollow shape; provided between the waterproof cover and the housing; It is led out inside the waterproof cover, the other end is led out inside the housing,
Ventilation pipe (23) disposed along the cable
b).

According to the above configuration, the space between the waterproof cover 17 of the motor unit 4 and the housing 25 is formed by the ventilation pipe 23b.
, The pressure change inside the waterproof cover 17 can be absorbed by the housing 25 side, and the waterproofness of the motor unit 4 does not decrease. Also, the ventilation pipe 23b
Can be easily wired together with the power supply control cable 23a of the motor 15 along the same route. Then, even if the motor unit 4 is washed with water immediately after the operation of the apparatus and the motor unit 4 is rapidly cooled, a change in air pressure can be absorbed by the casing 25 through the ventilation pipe 23b, so that a sudden change in air pressure inside the motor unit 4 does not occur. Water can be prevented from leaking from weakly waterproof parts.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing the overall configuration of a weighing device according to the present invention. The weighing device 1 is roughly constituted by a base 2, a transport unit 3, a weighing unit 4, and an indicator 5. A transport unit 3 for transporting articles is provided on the base 2, and the transport unit 3 is a run-up conveyor 3 provided on the front side in the transport direction.
A and a weighing conveyor 3B provided at the subsequent stage.

The measuring section 4 is provided on the base 2 and includes a load cell for supporting the measuring conveyor 3B, an electronic balance, and the like. The weighing unit 4 weighs the entire weighing conveyor 3B and the articles together, and outputs a weighing signal to a calculation unit (not shown). The arithmetic unit obtains the mass of the article by subtracting the mass of the weighing conveyor 3B in the arithmetic processing.

The indicator 5 is provided with the arithmetic section and a control section for controlling the driving of the transport section 3 therein. Further, the mass and the like of the article calculated by the calculation unit are displayed on the display unit 5 a above the indicator 5. The display unit 5a is provided with an operation unit 5b such as various keys for operating the apparatus.

In the weighing device 1 having the above-described configuration, the articles are weighed by the weighing unit 4 at a predetermined timing after the articles are placed on the weighing conveyor 3B while the articles are being conveyed by driving the conveyor constituting the conveying unit. The calculation unit performs control such as judging the quality of the article according to the mass of the article, and sorting the articles according to the mass. For sorting, a sorting conveyor may be provided on the base 2 behind the measuring conveyor 3B in the transport direction.

[0015] Run-up conveyor 3A and weighing conveyor 3B
Are provided with a motor for driving the transport, respectively. Hereinafter, the measuring conveyor 3B (hereinafter, simply referred to as a conveyor) will be described in detail. FIG. 2 is a plan view showing the conveyor 3B, and FIG. 3 is a plan view of the conveyor 3B. Conveyor 3
B is a pair of left and right support plates 6a and 6b, and support plates 6a and 6b.
There is a base 7 for fixedly supporting the space between b.

A transport unit 8 is mounted on the support plates 6a and 6b, and the transport unit 8 is detachable upward. The transport unit 8 includes a receiving table 10, a driving roller 11 a and a driven roller 11 b provided at both ends of the receiving table 10,
An endless belt 12 stretched between these rollers 11a and 11b is substantially constituted.

A motor unit 13 is provided on the support plate 6b at one end of the drive roller 11a. The output shaft 13b of the motor unit 13 is disposed coaxially with the drive roller 11a, and these are connected by a connecting portion 15 formed of a pair (male and female) of coupling.

FIG. 4 shows the motor unit 13 and the indicator 5
FIG. The motor unit 13 includes the motor 1
4 and a reduction gear (reduction gear) 16, which are housed in a waterproof cover 17.

An opening 17a is opened in the waterproof cover 17, and a lid 18 is detachably provided in the opening 17a. A waterproof packing 19 is provided all around the opening 17a of the waterproof cover 17, and the opening 17a is waterproofed by attaching the lid 18. The output shaft 13
The portion b is waterproofed by an oil seal 17d.

The lid 18 is provided with a waterproof seal connector 21. One end 23 A of the connection cable 23 is introduced into the waterproof cover 17 via the waterproof seal connector 21. The connection cable 23 includes a power control cable 23a for supplying power to the motor 14 and controlling the power, and
And a hollow ventilation pipe 23b. This one end 23
A, the power control cable 23a is connected to the connector 2
4 and the ventilation pipe 23b
Are arranged in an open state toward the inside of the waterproof cover 17. The power supply control cable 23a and the hollow ventilation pipe 23b are disposed between the motor unit 4 and the indicator 5, and a portion exposed to the outside is united by an outer cover 23c.

Similarly, an opening 25a is formed in a part of the casing 25 on the indicator 5 side, and a lid 26 is detachably provided in the opening 25a. The housing 25 has a larger internal volume than the waterproof cover 17. A waterproof packing 27 is provided all around the opening 25 a of the housing 25, and the opening 25 a
Parts are waterproofed. In the housing 25, a control board 28 is provided at the opening 25a. The control board 28 is provided with control means for controlling the drive of the motor 14 and each mechanism, the arithmetic unit, and the like. As shown in FIG. 1, the housing 25 has a larger accommodation space than the motor unit 4.

The housing 25 has an opening 25b for connecting the cable 23. In the opening hole 25b,
A seal connector 29 is provided, and the other end 23 </ b> B of the connection cable 23 is introduced into the housing 25 via the waterproof seal connector 29. At the other end 23B, the power control cable 23a is connected to the control board 28 via the connector 30, and the ventilation pipe 23b is arranged in an open state toward the inside of the housing 25. In this way, the ventilation pipe 23b is wired together with the power supply control cable 23a of the motor 14, so that the wiring can be easily performed.

By the way, inside the housing 25, the dryer 3 is provided.
2 are provided. The dryer 32 takes in the air outside the casing 25 and discharges the dried air into the casing 25 from the air outlet 32b. The dryer 32 is provided with a temperature and humidity meter, and the operation thereof is controlled by control means mounted on the control board 28 so as to maintain the inside of the housing 25 at a constant temperature and a constant humidity.

The weighing operation of the conveyor 3B having the above configuration will be described. When the motor 14 of the motor unit 13 is driven to rotate, the speed is reduced via the reduction gear 16 and the output shaft 4b rotates. The output shaft 4 b is connected to the drive roller 11
Rotate a. Accordingly, the belt 12 stretched between the driving roller 11a and the driven roller 11b moves in one direction, and conveys the placed article.

After the articles are transferred onto the belt 12, the measuring section 4 measures the conveyor 3B and the articles at a predetermined timing. The arithmetic unit subtracts the weight of the conveyor 3B in the arithmetic processing based on the weighing signal to obtain the mass of the article, and
Display the mass on the display section of. If the weighing result is within a certain range, it is determined to be good. On the other hand, if it is not within the predetermined range, the article is judged to be defective by, for example, determining that the article is defective by a sorting conveyor or the like at the subsequent stage.

During this weighing operation, the conveyor 3B holds the motor 1
4 rotates continuously and weighs articles one after another. This allows
The temperature inside the waterproof cover 17 increases due to the heat generated by the motor 14. However, since the inside of the waterproof cover 17 and the inside of the housing 25 are connected to each other through the ventilation pipe 23b, the temperature and humidity inside the
5 can be approached.

The conveyor 3B is periodically cleaned. When cleaning is performed by washing with water, water is applied from above to the entire area of the conveyor 3B. When the device is operating and water is applied immediately after the device is stopped, the water pressure inside the waterproof cover 17 is changed. However, the ventilation pipe 23b
The waterproof cover 17 is connected to the housing 25 having a large internal space by ventilation through the ventilation pipe 2.
3b can prevent the fluctuation of the atmospheric pressure. This prevents a sudden change in air pressure inside the waterproof cover 17, so that water can be prevented from entering from a portion that is vulnerable to changes in air pressure, such as the oil seal 17 d.

FIG. 5 is a diagram showing a second embodiment of the present invention. In this embodiment, two ventilation pipes 23ba,
The configuration using 23bb is different from the first embodiment. And these two ventilation pipes 23ba, 23
As for bb, one end introduced into the waterproof cover 17 is open. On the other end side introduced into the inside of the housing 25, one ventilation pipe 23 ba is attached to the air outlet 32 b of the dryer 32. The other ventilation pipe 23bb is opened.

According to this configuration, the dry air from the air outlet 32b of the dryer 32 can be blown into the waterproof cover 17 through the ventilation pipe 23ba. Thereby, the inside of the waterproof cover 17 can always be kept at constant temperature and humidity by the blown dry air.

In each of the above embodiments, the weighing conveyor 3B has been described as an example. However, the motor unit 13 for driving the belt is provided with
And it is also provided in the sorting conveyor of the latter stage, respectively. By providing a connecting cable 23 having a ventilation pipe of the same configuration between the motor unit and the casing 25 of the indicator 5, the similar operation and effect can be obtained for the run-up conveyor 3A and the sorting conveyor. become.

In the above embodiment, the weighing device has been described as an example. However, the configuration of the present invention is not limited to this, and can be applied to a metal detector for detecting a metal object in an article. The metal detector does not have the configuration of the weighing unit 4, and is configured to detect a metal object in an article by a detection unit provided in the middle of the conveyor while transporting the article on the conveyor. Similarly to the above, the conveyor of such a metal detector is transported and driven by a motor waterproofed by the waterproof cover 17. The ventilation pipe 23 is provided between the waterproof cover 17 and a casing of a control panel for controlling the operation of the metal detector.
b may be configured to be connected by ventilation. Thus, it is possible to similarly prevent a pressure change inside the waterproof cover 17 due to washing or the like immediately after the operation of the metal detector.

[0032]

According to the weighing device of the present invention, a hollow ventilation pipe is connected between a waterproof motor unit and a casing having a larger volume than the motor unit. A change in the internal air pressure can be absorbed by the housing, and the waterproofness of the motor unit does not decrease. This ventilation pipe can be wired collectively to the power supply control cable of the motor, and the wiring is not troublesome. In particular, even when the motor unit is rinsed immediately after the operation of the apparatus and the motor unit is rapidly cooled, a sudden change in air pressure does not occur inside the motor unit, and it is possible to prevent inundation from a weakly waterproof portion. . This allows
The waterproofness of the entire apparatus can be further improved, and the cleaning operation by washing with water or the like can be performed smoothly without any trouble.

If two ventilation pipes are provided, and one of them is connected to the blower of the dryer in the housing,
Dry air can be sent to the motor unit, and the inside of the waterproof cover 17 can be constantly maintained at a constant temperature and humidity. Further, the above effect can be obtained not only by the weighing device but also by a metal detector having a transport conveyor that transports articles by the same type of motor. In these weighing devices and metal detectors, especially when foods are weighed and metals are detected, it is necessary to frequently sterilize and disinfect the conveyors. Can be easily done.

[Brief description of the drawings]

FIG. 1 is a front view showing the entire weighing device of the present invention.

FIG. 2 is a plan view of the weighing device.

FIG. 3 is a side view of the weighing device.

FIG. 4 is a sectional view showing a main part of the weighing device.

FIG. 5 is a sectional view of a main part showing another embodiment of the weighing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Measuring device, 2 ... Base, 3 ... Conveying unit, 3A ... Run-up conveyor, 3B ... Measuring conveyor, 4 ... Measurement unit, 5 ... Indicator,
11a: driving roller, 11b: driven roller, 12: belt, 13: motor unit, 14: motor, 15: connecting portion, 17: waterproof cover, 18, 26: lid, 21, 29
... waterproof seal connector, 23 ... connection cable, 23a ...
Power supply control cable, 23b: Ventilation pipe, 25: Housing.

Claims (3)

[Claims] 1. A conveyor (3) for transporting articles, a weighing section (4) for weighing the articles, and a waterproof cover (17) for waterproofing a motor (14) as a drive source of the transport section. A housing (25) which is arranged at a predetermined distance from the motor and controls the rotation of the motor, and has a predetermined volume larger than the waterproof cover; and a housing (25) between the motor and the control means. A power supply control cable (23a) for power supply and control to be wired and connected, a hollow formed, provided between the waterproof cover and the housing, one end of which is led out into the waterproof cover;
A metering device, comprising: a ventilation pipe (23b) whose other end is led out inside the housing and is arranged along the cable. 2. The casing (25) is provided with a dryer (32) for drying the inside humidity, and the ventilation pipe is composed of two pipes (23ba, 23bb) along the control cable. The weighing device according to claim 1, wherein the other end of the one ventilation pipe is connected to an air outlet (32b) of a dryer, and the dry air sent out from the dryer is supplied into the waterproof cover. 3. The metal detector according to claim 1, further comprising a detection unit that detects a metal object in the article instead of the measurement unit.