JPH11183306A - Lifting device for noise insulating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mitigate a shock when the vertical movement of a noise insulating device storing a vessel is stopped in a vessel leakage detecting device detecting the gas leakage of the vessel filled with pressurized gas with a sound sensor. SOLUTION: The lifting device for a noise insulating device 35 for a vessel leakage detecting device is provided with a rod-less cylinder 70 for lifting or lowering the noise insulated device 35, a first and second pipes 74, 75 connecting the upper end and lower end of the air cylinder via a vertical shift selector valve 81 respectively, a first and second two-speed control selector valves 82, 83 provided between the vertical shift selector valve 81 of the first and second pipes 74, 75 and the rod-less cylinder, a sensor 1 detecting a position directly before the uppermost position of the noise insulated device 35 and a sensor 2 detecting a position directly before the lowermost position of the noise insulated device 35. The two-speed control selector valves 82, 83 are switched for deceleration before the noise insulated device 35 reaches the uppermost position or the lowermost position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak detecting device for a container, and more particularly to a sound insulating device in a leak detecting device for automatically and continuously detecting a leak in a container online.

[0002]

2. Description of the Related Art In a container for filling a fluid, a container in which a pressurized gas is enclosed is required to ensure the airtightness of the container. As such a container, for example, there is a stainless steel barrel container filled with beer. FIG. 8 shows the appearance of a keg container for filling beer, and FIG. 9 shows the internal structure near the keg opening.

[0003] The barrel 100 is provided with a base 102 at an upper portion of a container body 101 and a cylindrical portion 103 extending from the container body 101 at a lower portion. The base 102 includes a valve for introducing and discharging beer, and a valve mechanism for sealing a pressurized gas inside. FIG. 9 shows these valve mechanisms. A fitting 103 is fixed to the base 102 by screwing, and a joint between the base 102 and the fitting 103 is a seal ring 104.
Sealed by The fitting 103 has a bush 105 screwed into the base 102 and a down tube 106 whose tip extends to near the bottom of the container body 101.
A gas passage chamber 107 is formed between the two.

[0004] The down tube 106 is provided with a coil spring 108.
The elastic seal member provided at the upper end thereof abuts against the inner wall of the bush 105 to constitute the gas valve 109. When the down tube 106 is pushed downward, the inside and outside of the barrel container communicate with each other. Has become. A beer valve 1 urged upward by a compression coil spring 110 is provided at the upper end of the down tube 106.
11 is provided, and when the beer valve 111 is pushed down, the upper end and the lower end of the down tube communicate with each other,
It has a structure in which beer can be injected into and out of the keg container.

[0005] As described above, the barrel container 100 is
02 and fitting 103, gas valve 1
09, the beer valve 111, the seal ring 104, etc., have a hermetically sealed structure so that the filling gas and beer do not leak inside. If the valve mechanism is deformed or cracks are formed in the welded portion or the like, a completely sealed state cannot be maintained and the quality of the content of beer is affected. For this reason, such barrels are inspected for leaks before filling with the contents.

As a method of inspecting the leak of the barrel, a visual inspection, a method of detecting a light leak using a lighting device, or a method of introducing a gas such as helium into the barrel and leaking the gas is used. There is a method of detecting leakage of a container by detecting the presence / absence of any of them, but all of these methods require labor and time for the operation, and have a problem in detection accuracy. Therefore, the present applicant has already developed and proposed a leak detecting device for a container using an ultrasonic measuring device (Japanese Patent Laid-Open No. 7-103844).
issue).

FIG. 10 shows an example of the leak detection device disclosed herein. The leak detection device 200 is provided in the middle of the transport path of the transport conveyor 101, and an inspection stopper 105 for stopping the barrel 100 transported to the inspection position is provided at the inspection position of the transport path.
Upstream of the installation position of the leak inspection device 200, the barrel container 10
A stopper 104 for waiting for 0 is provided. The barrel 100 conveyed to the leak detection position is
In advance, the container opening is washed with washing water in the washing process,
The compressed air is previously injected into the keg 100 by opening the gas valve 109 of the fitting 103 shown in FIG.

[0008] The leak detection device 200 includes a gantry 210, a lift cylinder 206 located below the transport conveyor 101 and pushing up the barrel container at the inspection position, and a gantry 2
The apparatus includes a box-shaped fixed sound insulation device 207 provided on the upper part of the apparatus 10 and a sound wave sensor 208 attached to the fixed sound insulation device 207. In the leak detection device 200, the barrel 100 conveyed to the inspection position is lifted by the lift cylinder 206 so that its mouth enters the fixed sound insulation device 207.

As the sound wave sensor 208, for example, an acoustic transducer such as a microphone or a piezo element is used. The generated ultrasonic waves are transmitted to a sound wave sensor 20 as shown in FIG.
8, is converted into an electric signal, is amplified by the preamplifier 212, and then has a predetermined frequency band by the band-pass filter 213, that is, a frequency band in which leakage information of the barrel is distributed, is, for example, 36 KHz to
It is selected to pass only 45 KHz. The leak information that has passed through the band pass filter 213 passes through a waveform shaper 214 and is counted by a frequency counter 215 and sent to a frequency display unit 216.
7, and the presence or absence of leakage is displayed on the display means 218.

[0010]

By the way, in the leak container detecting device using the leak detecting device based on the ultrasonic measurement, the leak of the pressurized gas filled in the container is detected by the ultrasonic wave. The detection is performed by a sensor, but in order to accurately detect the sound of the gas leak, it is necessary to accurately distinguish the sound generated by a cause other than the gas leak. For this reason, when detecting gas leakage from a container filled with a pressurized gas, means for accommodating the container in the sound insulation device and shutting off external sound is used as described above. As shown in FIG. 10, a conventional sound insulating device has a box-shaped sound insulating device 20 in which a sound wave sensor is mounted on an upper portion of a gantry at an inspection position.
7 is fixedly provided, and the transported container is pushed up by the lift cylinder 206 so that the mouth of the container is positioned in the box-shaped sound insulation device, and the inspection is performed. For this reason, the lower part of the sound insulating device 207 is in an open state, and the entire container cannot be completely contained in the sound insulating space, and the sound wave sensor also detects sound outside the sound insulating device other than gas leakage. Sound became noise, and a process for cutting this noise was required.

At the inspection position on the container transport path, the container is placed on a sound-insulating table in order to completely house the container in the sound-insulating space, and the container is placed from above in a box-shaped sound insulation device. It is conceivable to lower the box to completely accommodate the container in the sound insulation space. Weight of sound insulation box is 60
Although the weight is about Kg, the weight is usually reduced to zero by connecting the balance weight with a chain, but the inertial energy associated with the vertical movement remains and increases in proportion to the speed. Therefore, when ascending and descending, it is very difficult to stop without impact at the bottom dead center, which is the stop position. The sound insulation box includes a sound wave sensor, and it is not preferable that an impact is applied to the sound insulation box itself, and the influence on peripheral devices is large.

SUMMARY OF THE INVENTION The present invention has been made in view of these problems, and an object of the present invention is to provide a sound-insulating box lifting / lowering device capable of raising / lowering the sound-insulating box as quickly as possible and reducing the shock at the time of stop. Make it an issue.

[0013]

The above object is achieved by the following constitution according to the present invention. The invention according to claim 1 includes a sound wave sensor for detecting gas leakage from a container filled with a pressurized gas accommodated in a sound insulation space, and detects gas leakage in the container by detecting gas leakage in the container. An elevating device for a sound insulation device in a container leak detection device, wherein an air cylinder for driving the sound insulation device up and down, and an upper end of the air cylinder and a lower end of the air cylinder are connected via up / down switching valves, respectively. A first and a second pipe, a first and a second two-speed control switching valve provided between the vertical movement switching valve and the air cylinder of the first and the second pipe, A sensor for detecting immediately before the highest position of the sound isolator and a sensor for detecting immediately before the lowest position of the sound isolator, and for controlling the second speed before the sound isolator reaches the highest position or the lowest position. Switching the switching valve to decelerate Characterized in that the so that.

According to a second aspect of the present invention, in the lift device for the sound insulating device according to the first aspect, the air cylinder is a rodless cylinder. In the present invention,
When the sound insulation device is driven up and down by the air cylinder, the sensor is detected just before the sound insulation device reaches the stop position, and the 2-speed switching control valve is switched to reduce the moving speed of the sound insulation device and suppress the inertial energy. It can be stopped in the state. Thereby, the impact to the sound insulation device at the time of stop is reduced, and the durability of the air cylinder for lifting and lowering is improved, and the reliability as the leak detection device is improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a leaky container detection device in which the container leak detection device of the present invention is incorporated. FIG. 1 (a)
Is a plan view, and (b) is a front view. The leak container detecting device of the present embodiment is composed of four divided stations, and is composed of a standby station 1, a pressurizing station 2, an inspection station 3, and an evacuating station 4 in order from the loading side of the barrel 100. .

The stand-by station 1 is a stand-by state for starting a pressurizing step in the next pressurizing station 2. The stand-by station 1 makes the keg containers stand by until the pressurizing devices 21 to 23 of the pressurizing station become empty. It is a place to keep. A common conveyor 10 is provided between the standby station 1 and the pressurizing station in the next process, and a stopper 11 is installed near the conveyor of the standby station. The barrel container 100 to be prepared can be appropriately parked for a necessary time.

The pressurizing station 2 is a station for injecting pressurized gas into the barrel container as a preparation stage for leak inspection, and includes three pressurizing devices 21, 22, 23. Each pressurizing device 21 * (* denotes as representative of 21 to 23)
As shown in FIG. 1B, a container holding device 24 is provided above the conveyor 10, and a pressurized gas filling device 25 is provided below the conveyor 10. The container holding device 24 converts the barrel 100 introduced with its mouth downward into a cylinder 24.
a, and is held down by a holding plate 24b driven by a. In addition, the gas filling device 25 includes the barrel container 1
No. 00 is filled with a pressurized gas, and is provided with a nozzle and a gas source which can be raised toward a container port located downward. The pressurizing station 2 is provided with a nozzle (not shown) for ejecting washing water at a container opening,
Before filling the cask container 100 with the pressurized gas, the mouth of the container is cleaned.

The inspection station 3 downstream of the pressurizing station has three leak inspection devices 31 arranged in series,
32 and 33 are provided. Each leak detecting device 31 * corresponds to the leak detecting device for a container of the present invention, and FIG.
This is the same in principle as the leak detection device described with reference to FIG. 0 and FIG. 11, and has a sound insulation device provided with a sound wave sensor. Each leak detection device 31 * includes a sound insulation device 35 above. The sound insulation device 35 is supported by the gantry 24, and can be moved up and down by driving means 35a. As shown in FIG. 2, the sound insulating device 35 has a box-shaped structure, is made up of inner and outer stainless steel boxes and an inner sound insulating material, and has a plurality of sound wave sensors 36 attached to the wall. The structure of the sound insulation device 35 will be described later in detail.

Each of the leak detecting devices 31 * also has a sound insulating table 37 provided with a conveyor. The sound detecting device 31 and the sound insulating table 37 form a sound insulating space by accommodating the loaded barrel 100 therein. I am trying to do it.
The rejection station 4 located downstream of the inspection station 3 sends a normal barrel container and a barrel container for which leakage has been detected based on the inspection result at the inspection station 3 to the regular transport path 4.
2 and a distributing device 41 for distributing the defective product to the defective product transport path 43.

FIG. 3 shows the sound insulation device 35. (A) is a front sectional view, and (b) is a plan view. The sound insulation device 35 is
It is composed of a cubic box 50 having an opening at the bottom as a whole. The box body 50 is formed of an outer box 51 made of stainless steel and an inner box 52 held at an interval therefrom. As shown in FIG. 3B, a support bracket 53 is attached to one side surface of the outer box, and is attached to a drive unit (not shown) of a drive device for moving the sound insulation device 35 up and down. It is a structure that can be done. The inner box 52 is fixed to the outer box 51 via an anti-vibration rubber 55 which is an elastic body as a fixing member. As shown in FIG. 4, the vibration isolating rubber 55 has a cylindrical shape and has two bolt insertion holes 56a and 56b. One of the bolt insertion holes 56a has an enlarged diameter portion for inserting a nut on the outside, and the other bolt insertion hole 56b has an enlarged diameter portion for inserting a nut on the inside. The vibration-proof rubber 55 is connected to the outer box by bolts 57 inserted into bolt holes 56b having nut insertion holes 56c inside. The inner box 52 is connected to the vibration-proof rubber 55 by bolts 58 inserted into the other bolt holes 56a. Therefore, the outer case 51 and the inner case 52 are indirectly connected by the bolts 57 and 58 via the vibration isolating rubber 55. Thus, the vibration applied to the outer case 51 is absorbed by the vibration isolating rubber 55 and is hardly transmitted to the inner case 52. Outer box 51 and inner box 52
Is filled with a sound deadening material 59 made of rock wool to form a sound insulation structure that prevents external sound from being transmitted to the inside of the box.

The upper wall and the side wall forming the box body 50 include:
A through hole 60 for attaching the sound wave sensor is formed, and a sensor mounting tool 61 for attaching the sound wave sensor is inserted into the through hole 60. As shown in FIG. 5, the sensor mounting tool 61 has a hole 61 a for inserting an acoustic wave sensor and a bolt hole 6 for fixing to the outer case 51.
It has a flange 61b on which 1c is formed. When mounting the sound wave sensor, a sound wave sensor (not shown) is inserted from the outer case 51 side, and the gap is filled with silicone resin to prevent sound from entering the inside through the hole 61a of the sensor mounting tool 61. doing.

An elastic member which seals a contact surface with the sound insulation table 37 on which the box 50 is placed and absorbs an impact when the box 50 is placed is provided on the four end faces forming the opening of the box 50. Is attached. The cushion member 65 is made of a gel-like substance (α gel; registered trademark) mainly composed of silicone, and has a plurality of narrow grooves parallel to the length direction of the side, that is, parallel to the side wall of the box body 50 as shown in FIG. 65a are formed.

In the case where water remains on the sound insulating table 37, when the sound insulating device 35 is lowered and mounted on the sound insulating table 37, water bubbles are formed between the cushion member and the sound insulating table, The blisters can burst during the test and generate noise. The narrow groove 65a provided in the cushion member 65 is provided to prevent such a situation. By forming the narrow groove 65a, even if a water bubble is formed between the narrow groove 65a, the water bubble does not enter the narrow groove 65a and is not crushed to generate a popping sound. In addition, as the material used for the cushion member, an elastic rubber can be used in addition to the silicone gel.

Next, the driving device 3 for raising and lowering the sound insulating device 35
5a will be described. In this embodiment, the drive device 35a for raising and lowering the sound insulation device 35 is a rodless cylinder 70.
It consists of. FIG. 4 schematically shows the rodless cylinder 70. The rodless cylinder 70 is a cylinder 7
1 and a piston 72, and a pipe 74 for introducing and discharging compressed air is provided at an upper end and a lower end of the cylinder 71.
75. The piston 72 has a mounting portion 73 which is formed on the wall of the cylinder 71 and is slidable along a groove (not shown) provided with a sealing means while maintaining the cylinder 71 in a sealed state. It has been.
The sound insulation device 35 which is a driven body is attached to the attachment portion 73. Therefore, the piston 72 moves up and down by conducting and discharging compressed air through the conduits 74 and 75,
The sound insulation device 35 attached to the attachment portion 73 moves up and down by the stroke of the piston 72.

Next, a control system of a drive unit of the sound insulation device using the rodless cylinder 70 will be described with reference to FIG. Pipe lines 74 and 75 connected to the cylinder 71 are connected to a compressed air source 80 via a vertical movement switching valve 81. The up-down switching valve 81 has two switching passages 81a. 81b
The rod 72 is moved left and right as shown by the arrow in the figure to switch the moving direction of the piston 72 of the rodless cylinder 70 up and down. FIG. 5 shows a state in which the compressed air source 80 and the pipe 74 are connected, the switching passage 81a is connected to the pipes 74 and 75, and the compressed air source 80 is connected to the pipe 74 connected to the upper end of the cylinder. , A conduit 75 connected to the lower end forms a passage to be discharged to the outside. Thereby, the piston 72 of the rodless cylinder 70 moves downward. On the other hand, by moving the up / down switching valve 81 to the right in the drawing, the switching passage 81 is connected to the line 7.
4 and 75, the compressed air source 80 is connected to the cylinder 71
Is connected to a line 75 connected below the
Will rise.

The control system according to the invention further comprises a line 7
First and second two-speed control switching valves 82 and 83 are provided between the upper and lower switching valves 81 and the rodless cylinder 70. The second speed control switching valves 82 and 83 are respectively provided with switching passages 82a, 83a, 82b and 83b and a flow control valve 8
2c, 83c, and 82a, 83c as shown in the figure.
a is connected to the conduits 74 and 75, the flow velocity becomes a normal flow rate, and the switching passages 82b. When the pipe 83b is connected to the conduits 74 and 75, the air is discharged through the flow control valves 82c and 83c, and the flow velocity of the air discharged from the cylinder 71 is restricted. As a result, the moving speed of the piston 72 is reduced. In the figure, 84, 85
Is a flow control valve with a check valve, and the air discharged from the cylinder 71 is restricted to a predetermined flow velocity. Position sensors S1 and S2 for detecting the piston position are provided near the upper end and the lower end of the cylinder 71 of the rodless cylinder 70, and the position sensors S1 and S2 are provided just before the piston reaches the uppermost point and the lowermost point. The position is detected.

Next, a description will be given of the control of the elevation drive device of the sound insulation device having the above-mentioned control system with reference to FIGS. FIG. 6 shows a case where the sound insulation device 35 is lowered.
First, FIG. 7A shows an initial state in which the sound insulating device 35 is at the upper position and starts to descend. The compressed air source 80 is connected to the upper part of the cylinder 71 through a conduit 74 by a vertical movement switching valve 81, and the piston 72 descends at a predetermined speed, and the sound insulation device 35 connected thereto descends at a predetermined speed. I do. At this time, the second speed control switching valves 82 and 83 are connected to the normal flow passages 82a and 83a, respectively.

The piston 72 descends, and the position of the position sensor S2 installed below the cylinder 71, that is,
When reaching the position immediately before reaching the sound insulation table, the control device (not shown) detects this and detects the second-speed control switching valve 8.
3 is switched as shown in FIG. Then, the passage 75 connected below the cylinder 71 becomes the switching passage 83b.
As a result, the air discharged from below the cylinder 71 is restricted and discharged through the flow control valve 83c, and the descending speed of the piston 72 is reduced. As a result, the moving speed of the sound insulation device 35 is reduced, and the sound insulation device 35 is soft-landed on a predetermined position, that is, on the sound insulation table 37 shown in FIG.

FIG. 7 shows a case where the sound insulation device 35 is raised. (A) shows the state at the beginning of the ascent, and (b) shows the state just before reaching the highest position. First, the compressed air source 80 is connected to a pipe line 75 connected to the vertical movement switching valve 81 below the cylinder 71, and compressed air is supplied below the cylinder 71 to move up the piston 72. At this time, 2
The speed control switching valves 82 and 83 are respectively
a, 82b, the piston 72 rises at a predetermined speed, and thus the sound insulation device 35 rises at a predetermined speed. Immediately before the piston 72 reaches the uppermost position, that is, when the piston 72 reaches the position of the position sensor S1, the control device detects this, and as shown in FIG.
Switch. Thus, the air discharged from above the cylinder 71 is discharged through the flow control valve 82c, and is discharged in a state where the flow is restricted. As a result, the rising speed of the piston 72 is reduced, and stops at a predetermined position. As a result, the sound insulation device 35 is gradually stopped in a state where the sound insulation device 35 is decelerated to the predetermined highest position.

As described above, according to the present embodiment, the two-speed control switching valve is provided in the middle of the pipe for supplying the compressed air to the rodless cylinder for driving the sound insulation device, and the rodless cylinder By providing a sensor for detecting the time just before the piston reaches the uppermost position and the lowermost position, so as to reduce the speed at the time of stopping of the piston, so as to reduce the speed at the time of stopping the ascent or descent of the sound insulation device. Therefore, the shock at the time of stopping the sound insulation device can be reduced without slowing down the entire elevating speed of the sound insulation device. For this reason, it is possible to suppress the occurrence of vibration and damage to the peripheral devices in addition to the sound insulation device itself, and to improve the reliability of the entire device.

In the above embodiment, a position sensor is provided in the rodless cylinder to detect the position immediately before reaching the highest position and the lowest position in the sound insulating device, and the position of the piston is detected. Although the position of the sound insulation device is detected, the position sensor may be attached to a predetermined position above and below the moving path of the sound insulation device, and thereby the position immediately before the stop position of the sound insulation device may be detected. . Further, the example in which the rodless cylinder is used as the driving unit of the sound insulation device has been described. However, the present invention is not limited to the rodless cylinder, and a normal piston cylinder may be used.

[0032]

As described above, according to the present invention, since the speed at the time of stopping the ascent or descent of the sound insulating device is reduced, the sound insulating device is not reduced in overall lifting speed. The shock at the time of stopping can be reduced. For this reason, it is possible to suppress the occurrence of vibration and damage to the peripheral devices in addition to the sound insulation device itself, and to improve the reliability of the entire device.

[Brief description of the drawings]

FIG. 1 is a view showing a leaking container detecting device in which a leak detecting device for a container according to an embodiment of the present invention is used. (A) is a plan view, and (b) is a front view.

FIG. 2 is a diagram showing a sound insulation device of the leak detection device.

FIG. 3 is a diagram showing details of a sound insulation device. (A) is a front sectional view, and (b) is a plan view.

FIG. 4 is a view showing a schematic configuration of a rodless cylinder.

FIG. 5 is a diagram illustrating a control system of a lifting drive device of the sound insulation device.

FIG. 6 is a diagram illustrating the operation of the sound insulation device when the sound insulation device is lowered.

FIG. 7 is a diagram illustrating the operation of the sound insulation device when the sound insulation device is raised.

FIG. 8 is a view showing a beer keg container to be inspected.

FIG. 9 is a view showing details of a mouth portion of the barrel container.

FIG. 10 is a diagram showing a leak detecting device using a conventional ultrasonic sensor.

FIG. 11 is a block diagram showing a conventional block for processing a signal detected from a sound wave sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stand-by station 2 Pressurizing station 21-23 Pressurizing device 3 Inspection station 31-33 Leak detecting device 35 Sound insulating device 36 Sound wave sensor 10 Conveyor 4 Expulsion station 41 Distributing device 70 Rodless cylinder 71 Cylinder 72 Piston 80 Compressed air source 81 Up and down Dynamic switching valve 82, 83 Switching valve for 2-speed control

Claims (2)

[Claims] 1. A sound wave sensor for detecting gas leakage from a container filled with a pressurized gas accommodated in a sound insulation space,
What is claimed is: 1. A lifting device for a sound insulation device in a container leakage detection device for detecting leakage of a container by detecting gas leakage of a container by a sound wave sensor, and an air cylinder for driving the sound insulation device up and down, and an upper end of the air cylinder And a first and a second pipe connecting the lower end of the air cylinder via a vertical movement switching valve, respectively.
First and second two-speed control switching valves provided between the vertical movement switching valve and the air cylinder in the first and second conduits, and detecting immediately before the highest position of the sound insulation device. And a sensor for detecting immediately before the lowest position of the sound insulating device, and the second speed control switching valve is switched to decelerate before the sound insulating device reaches the highest position or the lowest position. A lifting / lowering device for a sound insulation device, characterized in that: 2. The elevating device for a sound insulating device according to claim 1, wherein said air cylinder is a rodless cylinder.