JP2019194399A - Sludge suction vehicle and sludge suction equipment - Google Patents

Abstract

To provide a sludge suction vehicle and sludge suction equipment in each of which clogging of a filter is detected, and an operator can appropriately treat the clogging.SOLUTION: Sludge suction equipment 2 comprises: a storing tank part 5 for housing sucked sludge therein; a suction part 14 decompressing the storing tank part; a filter part 11 provided between the storing tank part 5 and the suction part 14; a differential pressure measuring part 12 detecting the pressure difference between upstream pressure, on the storing tank part 5 side, of the filter part 11 and downstream pressure, on the suction part 14 side, of the filter part 11; and a control part for performing an action of making the operator recognize the necessity of maintenance of the filter part 11 on the basis of the pressure difference value detected by the differential pressure measuring part 12. The control part outputs alarm sound, or opens a downstream open valve 20, or opens an upstream open valve 19, or lowers the engine speed for driving the suction part 14, as the action of making the operator recognize the necessity of maintenance of the filter part 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sludge suction vehicle and a sludge suction device for decompressing a storage tank, sucking sludge such as dust, rubble, and sewage and collecting it in the storage tank.

  Conventionally, as described in Patent Document 1, sludge suction equipped with a sludge suction mechanism (sludge suction device) that uses a vacuum pump or the like as a suction part (blower) to generate negative pressure and collect sludge in a storage tank part. The car was known. In the sludge suction vehicle described in Patent Document 1, a water tank (22) for a mist catcher is provided upstream of the blower (21) to collect powder such as dust.

Japanese Patent No. 4064603 Japanese Patent No. 3706626

  In addition to the water tank, a filter can be used as a mechanism for collecting the powder in the previous stage of the blower (suction unit). When a filter is used, if the filter becomes clogged, there is a possibility that a hole is formed in the filter or the filter is deformed by the suction pressure (vacuum pressure) of the blower. Further, when clogging progresses, powder or the like reaches the blower, and as a result, the blower may break down. Therefore, when the filter is clogged, it is necessary to take measures such as cleaning or replacing the filter at an appropriate timing. Further, when the filter clogging reaches a limit value, it is necessary to take a measure such as an emergency stop of the suction operation.

  However, a sludge suction vehicle and a sludge suction device that detect clogging of the filter in the front stage of the blower and can appropriately cope with it have not been proposed.

  Patent Document 2 discloses a device that detects clogging of filters (85a, 85b) used in a vacuum pump by a differential pressure sensor (87). However, the device described in Patent Document 2 is an invention that automatically switches the suction filtration path by using the other filter (85b) when clogging of one filter (85a) occurs. However, in the case of a sludge suction wheel, the filter is, for example, a cylindrical shape having a diameter of about 50 cm and a total length of about 1 m, and has a considerable size. Therefore, as described in Patent Document 2, the invention of switching the filter cannot be applied as it is to the sludge suction vehicle and the sludge suction device.

  In light of the above, an object of the present invention is to provide a sludge suction vehicle and a sludge suction device that can detect the clogging of the filter in the front stage of the suction portion and can be appropriately handled by the operator.

  In order to solve the above problems, the present invention has the following features. The present invention is a sludge suction device that sucks and collects sludge, a storage tank section that stores the sucked sludge, a suction section that decompresses the storage tank section, and a filter provided between the storage tank section and the suction section. A differential pressure measuring unit that detects a difference between the upstream pressure on the storage tank side and the downstream pressure on the suction unit side, and a differential pressure value detected by the differential pressure measuring unit with respect to the filter unit and the filter unit And a control unit for causing the operator to recognize the necessity of maintenance of the filter unit.

  The control unit outputs an alarm sound based on the differential pressure value detected by the differential pressure measuring unit.

  The sludge suction device further includes a downstream side open valve provided on the downstream side of the filter unit. The control unit opens the downstream side release valve based on the differential pressure value detected by the differential pressure measuring unit.

  The sludge suction device further includes an upstream release valve provided on the upstream side of the filter unit. The control unit opens the upstream side release valve based on the differential pressure value detected by the differential pressure measurement unit.

  The control unit reduces the rotational speed of the engine for driving the suction unit based on the differential pressure value detected by the differential pressure measuring unit.

  Based on the differential pressure value detected by the differential pressure measuring unit, the control unit notifies the advance notice that the maintenance time of the filter unit is approaching.

  The control unit uses a value that is 70% or less of the absolute value of the vacuum pressure that can be sucked by the suction unit as a threshold value, and when the differential pressure value detected by the differential pressure measurement unit exceeds the threshold value, An operation for causing the operator to recognize the necessity of maintenance is executed.

  The control unit uses two or more threshold values as the differential pressure value detected by the differential pressure measurement unit. When the differential pressure value detected by the differential pressure measurement unit exceeds the first threshold value, the control unit notifies a notice that the maintenance time of the filter unit is approaching. When the differential pressure value detected by the differential pressure measurement unit exceeds the second threshold, the control unit outputs an alarm sound, opens a downstream side open valve provided on the downstream side of the filter unit, or filters The upstream side opening valve provided on the upstream side of the unit is opened, or the rotational speed of the engine for driving the suction unit is reduced.

  Moreover, this invention is a sludge suction wheel carrying the said sludge suction device.

  ADVANTAGE OF THE INVENTION According to this invention, the sludge suction device and sludge suction wheel which can make an operator recognize the necessity of the maintenance of a filter part based on the differential pressure value which the differential pressure measurement part detected will be provided. . As a result, the operator can recognize clogging of the filter at the front stage of the suction unit, and the filter can be properly maintained. As a result, it is possible to prevent the suction part from being broken.

  The operator can recognize the necessity of filter maintenance by a simple and inexpensive method of outputting an alarm sound.

  By opening the downstream opening valve, the suction part cannot suck sludge. Therefore, the operator can recognize the abnormality and recognize the necessity of the filter maintenance. In addition, by opening the downstream side release valve, the suction part does not suck dust or the like from the filter, so that the failure of the suction part can be surely prevented.

  If the operator continues the suction operation while the alarm is sounding, the filter will continue to be clogged. Therefore, by opening the downstream side release valve and forcibly preventing the suction of sludge, the suction part sucks clean outside air without sucking from the filter, thereby allowing the suction part to be sucked. Therefore, it is possible to reliably prevent the malfunction, and this is an extremely useful operation method.

  By opening the upstream release valve, the suction part cannot suck sludge. Therefore, the operator can recognize the abnormality and recognize the necessity of the filter maintenance. In addition, by opening the upstream side release valve, the filter unit does not become clogged any more, so that the failure of the suction unit can be reliably prevented.

  If the operator continues the suction operation while the alarm is sounding, the filter will continue to be clogged. Therefore, it is possible to reliably prevent the suction unit from failing by opening the upstream side release valve to forcibly prevent the suction of sludge while preventing the filter from becoming clogged. It becomes possible and becomes a very useful operation method.

  Even if the engine speed is decreased, the suction unit cannot suck the sludge, or the suction force decreases. Therefore, the operator can recognize the abnormality and recognize the necessity of the filter maintenance. Moreover, it becomes possible to delay the progress of clogging of the filter unit by reducing the engine speed. Therefore, it is possible to reliably prevent a failure of the suction part.

  By notifying the advance notice of the maintenance time, the operator can know in advance that the filter may be clogged soon and suction may not be possible. Therefore, replacement filters and filter cleaning tools can be brought to the work site in advance, and filter maintenance can be performed quickly when the filter is clogged. You will be able to continue working. Therefore, this operation is also an extremely useful operation method.

  By using a value equal to or less than the absolute value of 70% of the vacuum pressure that can be sucked by the suction part as a threshold value, it becomes possible to reliably prevent the suction part from failing.

  The control unit notifies the maintenance time at the first threshold level, and the control unit executes an operation to inform the operator of the necessity of maintenance at the second threshold level, so that the operator prepares for maintenance in advance. This makes it possible to recognize the necessity of maintenance.

  These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

FIG. 1 is a side view of a sludge suction vehicle 1 according to an embodiment of the present invention. FIG. 2 is a block diagram showing a functional configuration of the sludge suction device 2 mounted on the sludge suction vehicle 1. FIG. 3 is a block diagram showing a functional configuration of the sludge suction device 2 mounted on the sludge suction vehicle 1.

  FIG. 1 is a side view of a sludge suction vehicle 1 according to an embodiment of the present invention. 2 and 3 are block diagrams showing a functional configuration of the sludge suction device 2 mounted on the sludge suction vehicle 1. FIG. In FIG. 2, the flow at the time of suction is indicated by a thick arrow. In FIG. 3, the flow at the time of pumping is shown by the thick arrow.

  In the present invention, there are a case where the sludge suction device 2 is manufactured integrally with the vehicle and a case where the sludge suction device 2 is manufactured independently of the vehicle. In FIG. An integrated sludge suction vehicle 1 is shown.

  When the sludge suction device 2 is manufactured integrally with the vehicle, the drive of the suction portion (also referred to as “blower”) 14 of the sludge suction device 2 is typically driven from an engine mounted on the vehicle. Power for driving is taken out via PTO (Power Take Off). However, even when the sludge suction device 2 is manufactured integrally with the vehicle, an independent engine for driving the suction portion 14 may be mounted on the sludge suction device 2.

  When the sludge suction device 2 is manufactured independently of the vehicle, the sludge suction device 2 is mounted on a vehicle such as a general-purpose truck. In this case, the suction unit 14 may be driven by obtaining power from the PTO or the like of the vehicle, or an independent engine is provided in the sludge suction device 2 and suction is performed using the independent engine. The unit 14 may be driven.

  In the above two cases, the mechanism of the sludge suction device 2 is common. Hereinafter, the configuration, function, operation, and the like of the sludge suction device 2 will be described with reference to FIG.

  The sludge suction device 2 includes a suction hose 3, a suction port valve 4, a storage tank unit 5, a pressure feed port valve 6, a sludge outflow prevention unit 7, a first pipe 8, a secondary catcher 9, a second Pipe 10, filter part 11, differential pressure measuring part 12, third pipe 13, suction part 14, fourth pipe 15, silencer 16, discharge safety valve 17, pressure gauge 18, An upstream release valve 19, a downstream release valve 20, a suction switching valve 21, a suction switching valve 22, and a suction switching valve 23 are provided.

  A suction valve 4 and a pressure feed valve 6 are attached to the reservoir 5. A suction hose 3 is attached to the suction valve 4. The suction valve 4 is released and the sludge is sucked from the suction hose 3.

  The suction unit 14 includes a vacuum pump.

  When suctioning sludge, the suction pressure switching valves 21 and 23 are released, and the suction pressure switching valve 22 is closed. Accordingly, when the suction unit 14 rotates, the inside of the storage tank unit 5 is depressurized, and air flows in the direction indicated by the thick arrow in FIG. 2 to perform suction. The sucked air is finally discharged from the silencer 16. At that time, the silencer 16 is muted.

  A sludge outflow prevention part 7 is provided at the upper part of the storage tank part 5. The sludge outflow prevention unit 7 has an expiration float 7a inside. When the inside of the storage tank portion 5 becomes full, the expiration float 7a rises and the expiration is detected. When the expiration is detected by the sludge outflow prevention unit 7, the sludge suction device 2 stops the operation of the suction unit 14 so as not to perform suction by the suction unit 14.

  A hose is appropriately attached to the pressure feed valve 6. When the sludge stored in the storage tank 5 is discharged, the pressure feed valve 6 is released. The storage tank 5 is provided with a hatch 5a, and the sludge inside can be discharged by opening the hatch 5a.

  When the sludge is pumped, the upstream side release valve 20 and the suction pressure switching valve 22 are opened, and the suction pressure switching valves 21 and 23 are closed. Thereby, when the suction part 14 rotates, air flows in the direction shown by the thick arrow in FIG. 3, and the sludge accumulated in the storage tank part 5 is discharged from the pumping port valve. The pressure at the time of pumping is measured by the pumping meter 18. The discharge safety valve 17 is a safety valve that is opened when the pressure during pressure feeding becomes high. When the discharge safety valve 17 is opened, the pressure feeding pressure escapes to the silencer 16 side.

  Most of the sucked sludge is accommodated in the storage tank 5. However, lightweight objects such as dust are fed into the first pipe 8 without falling into the storage tank 5. These dusts and the like are sent to the secondary catcher 9 through the first pipe 8. The secondary catcher 9 is of a cyclone type and collects dust and the like that has passed through the first pipe 8. Although most of dust and the like are collected by the secondary catcher 9, dust or fine dust existing in the air passes through the secondary catcher 9.

  Here, the secondary catcher 9 is a cyclone type, but is not limited to the cyclone type, and may be an instrument that collects dust and the like by a filter, and collects dust and the like. If it is a possible instrument, it is not particularly limited. Further, the secondary catcher 9 is not an essential configuration in the present invention.

  Fine dust or the like that has passed through the second pipe 10 reaches the filter unit 11. The filter unit 11 includes a filter case 11a and a filter 11b accommodated in the filter case 11a. The filter 11b is, for example, a cylindrical filter having a multilayer structure in which a plurality of filters are overlapped. However, the shape and structure of the filter 11b are not particularly limited. Fine dust or the like that reaches the filter unit 11 is caught by the filter 11 b in the filter unit 11. As a result, clean air that does not contain dust or the like is sent from the filter unit 11 to the third pipe 13.

  The filter unit 11 can measure the difference between the pressure in the second pipe 10 on the upstream side of the storage tank unit 5 side and the pressure in the third pipe 13 on the downstream side of the suction unit side. A differential pressure measuring unit 12 is attached. As the differential pressure measuring unit, for example, a differential piezoelectric transmitter EJA110J manufactured by Yokogawa Electric Corporation can be used, but any instrument capable of measuring a pressure difference may be used. It is not intended to limit the invention. The differential pressure measurement unit 12 may include a display unit for displaying the pressure difference, but the present invention is not limited thereto.

  The filter 11b accumulates fine dust and the like by use, and gradually clogs. When the filter 11b is clogged, the suction pressure (vacuum pressure) on the third pipe 13 side increases, and a hole is formed in the filter 11b or the filter 11b is deformed. As a result, the sucked material such as dust that should be collected by the filter 11b originally reaches the suction unit 14. If dust or the like is sucked, the suction portion 14 is likely to break down.

  Therefore, a control unit (not shown) detects a differential pressure value (such as a current value) obtained from the differential pressure measurement unit 12, and based on the detected differential pressure value, the necessity for maintenance of the filter unit 11 is indicated to the operator. Execute the action for recognition.

  When the filter 11b is not clogged, the differential pressure value is almost zero. When the filter 11b is clogged, the differential pressure value gradually increases. When the differential pressure value exceeds the predetermined threshold value, as described above, the possibility that the suction unit 14 breaks down increases. Therefore, the control unit determines whether or not the differential pressure value exceeds the predetermined threshold value. To detect.

  For example, in the applicant's embodiment, a vacuum pump capable of suctioning up to about −93 Kpa was used as the suction unit 14. In this case, 40 Kpa was used as the predetermined threshold used by the control unit. However, the specific value of the predetermined threshold value does not limit the present invention.

  As a method for determining the predetermined threshold value, an absolute value of 70% of the vacuum pressure that can be sucked by the suction unit 14 may be used as the differential pressure value, preferably 60%, and more preferably 50%. For example, when the suction unit 14 can suck up to a vacuum pressure of −50 Kpa, the control unit may use 35 Kpa, preferably 30 Kpa, and more preferably 25 Kpa as the predetermined threshold value of the differential pressure value. Use it.

  Therefore, as a preferred embodiment, the predetermined threshold value of the differential pressure value used by the control unit may be a value equal to or less than the absolute value of 70% of the vacuum pressure that can be sucked by the suction unit 14, and preferably 60%. A value less than the absolute value may be used, and more preferably a value less than 50% absolute value may be used.

  The predetermined threshold value of the differential pressure value is considered as a safety factor for protecting the suction unit 14. Therefore, if the safety factor is lowered, a value equal to or higher than an absolute value of 70% of the vacuum pressure that can be sucked by the suction unit 14 is set to a predetermined differential pressure value (for example, 75% of the vacuum pressure that the suction unit 14 can suck). Or an absolute value of 80%).

  On the contrary, if the safety factor is further increased, a value equal to or less than 45% of the absolute value of the vacuum pressure that can be sucked by the suction unit 14 may be set as the predetermined differential pressure value, and further, the suction unit 14 can suck. A value equal to or less than 40% of the absolute value of the vacuum pressure may be set as the predetermined differential pressure value.

  In the above-described embodiment, the vacuum pressure that can be sucked by the suction unit 14 is −93 Kpa, whereas the predetermined differential pressure value is 40 Kpa, so that the absolute value of 43% of the vacuum pressure that the suction unit 14 can suck is absolute. The value is used as the differential pressure value.

  Since the predetermined threshold value is also related to the ability of the suction unit 14, it may be appropriately determined without being bound by the above example.

  Based on the detected differential pressure value, the control unit performs an operation that allows the operator to recognize the necessity of maintenance of the filter unit 11, and as an operation for that purpose, here, four operations are taken as an example. To do. Here, the control unit uses as a criterion whether or not the differential pressure value exceeds a predetermined threshold value. The following four operations may be performed independently, or may be performed in combination of two or more. It is assumed that the upstream side open valve 19 and the downstream side open valve 20 are automatic valves that can be opened and closed by an instruction signal from the control unit.

(First operation)
When a differential pressure value exceeding a predetermined threshold value is detected, the control unit outputs an alarm sound from an output unit such as a buzzer or a display device (not shown) to confirm that the operator needs to maintain the filter. Notice. Here, the maintenance of the filter refers to cleaning and replacement of the filter, inspection of the filter, and the like.

(Second operation)
When a differential pressure value exceeding a predetermined threshold is detected, the control unit opens the downstream side release valve 20 existing on the downstream side of the filter unit 11. Thereby, the suction part 14 can suck | inhale air from the downstream open | release valve 20, a load to the suction part 14 is lose | eliminated, and the suction part 14 will be protected. In this case, since the sludge is not sucked, the operator notices an abnormality and becomes aware of the necessity of filter maintenance. Naturally, if the first operation is performed before the second operation so that the output unit emits an alarm sound, the operator can easily recognize the necessity of the filter maintenance.

(Third operation)
When a differential pressure value exceeding a predetermined threshold is detected, the control unit opens the upstream side release valve 19 existing on the upstream side of the filter unit 11. Thereby, the suction unit 14 sucks air from the load release valve 19. Therefore, the suction force is not transmitted to the storage tank unit 5, and the sludge cannot be sucked. Therefore, the operator notices the abnormality and becomes aware of the necessity of filter maintenance. Further, since the filter 11b is not clogged any more as long as suction cannot be performed, the suction part 14 is protected as a result. Naturally, if the first operation is performed before the third operation so that the output unit emits an alarm sound, the operator can easily recognize the necessity of checking the filter or the like.

(Fourth operation)
When a differential pressure exceeding a predetermined threshold is detected, the control unit decreases the rotational speed of the engine that rotates the suction unit 14. As the engine speed decreases, the suction force of the suction unit 14 decreases, so the load on the suction unit 14 is reduced. Thereby, failure of the suction part 14 can be prevented. Moreover, since sludge is not attracted | sucked because the attraction | suction force of the suction part 14 falls, an operator notices abnormally and will notice the necessity for the maintenance of a filter. Before the fourth operation, the first operation is performed so that the output unit emits an alarm sound, the second operation is performed, the suction unit 14 is protected, or the third operation is performed. If the suction is disabled, the operator can easily recognize the necessity of maintenance of the filter.

(About combinations of actions)
Here, combinations of the first to fourth operations and their effects will be described.

  The control unit may perform only the first operation. In this case, the operator can quickly recognize the clogging of the filter with an alarm sound or the like, and can respond quickly.

  The control unit may perform only the second operation. In this case, since the air from the load release valve 20 can be fed into the suction part 14, the suction part 14 is reliably protected.

  The control unit may perform only the third operation. In this case, since suction cannot be performed, the operator can quickly recognize the abnormality, and if suction cannot be performed, the filter 11b will not be clogged any more, so that the suction unit 14 is protected as a result. It will be.

  The control unit may perform only the fourth operation. In this case, since the suction force is reduced, the operator can quickly recognize the abnormality and notices the necessity for the maintenance of the filter. Further, as a result of the reduced suction force, the filter clogging can be prevented from proceeding in an accelerated manner, so that the suction part 14 is protected as a result.

  The control unit may perform the first and second operations. As a result, the operator can reliably protect the suction portion 14 while noticing that the filter is clogged. This is a practical combination in terms of achieving both protection of the suction portion and filter maintenance.

  The control unit may perform the first and third operations. Thereby, the operator can prevent the filter 11b from further clogging while noticing that the filter is clogged, and as a result, the suction part 14 can be protected. This is a practical combination in terms of achieving both protection of the suction portion and filter maintenance.

  The control unit may perform the first and fourth operations. The operator can delay the progress of further clogging of the filter 11b while noticing the clogging of the filter, and as a result, the suction part 14 can be protected. This is a practical combination in terms of achieving both protection of the suction portion and filter maintenance.

  The control unit may perform the first, second, and third operations. By combining the second and third operations, it is possible to realize reliable protection of the suction unit 14 and reliable reduction of the suction force.

  The control unit may perform the first, second and fourth operations. Alternatively, the control unit may perform the first, third, and fourth operations. Alternatively, the control unit may perform the first, second, third, and fourth operations. In this way, by combining the second and / or third operation with the fourth operation and reducing the engine speed, it is possible to prevent the suction unit 14 from being unnecessarily idle, It is possible to prevent wasteful consumption and noise. These combinations are considered to be the most practical combinations from the viewpoint of protecting the suction unit 14 and preventing the idle rotation of the suction unit 14.

  And a control part may control by operation | movement other than the combination mentioned above, and the combination of each operation | movement does not limit this invention.

  Moreover, it is good also as using several steps of differential pressure values as a predetermined threshold value. For example, the first threshold value is set as an absolute value of 40% of the vacuum pressure of the suction unit 14, the second threshold value is set as an absolute value of 45%, and the third threshold value is set as an absolute value of 50%. Then, the control unit may recognize the threshold value step by step. In addition, the numerical value quoted here is only an example, and does not limit the present invention.

  When using a plurality of threshold values, for example, the fourth operation is performed at the first threshold level to reduce the suction force, and the first operation is performed at the second threshold level to generate an alarm sound. The second and / or third operation may be performed at the third threshold level to stop suction and protect the suction unit.

  In addition, at the first threshold level, a notice of notice that the maintenance time of the filter 11b is approaching is issued. At that time, instead of a loud alarm sound, for example, a notification by voice or a lighting display of an LED indicating the maintenance time of the filter may be used. When the first threshold value is passed and the second threshold value is reached, the control unit emits a loud alarm sound, opens the upstream release valve 19, or opens the downstream release valve 20. The operator may perform maintenance on the filter 11b by opening the valve or reducing the engine speed.

  The means for notifying the maintenance time of the filter 11b when the first threshold value is reached is not limited to the display by the LED, and any means can be used as long as the operator can recognize the maintenance time.

  Naturally, the combination pattern of operations when using a plurality of threshold values can be variously changed, and the example shown here is only an example.

  In the above description, the control unit operates using the threshold value of the differential pressure value, but the threshold value may vary depending on the years of use, road conditions, weather conditions, and the like.

  The differential pressure measurement unit 12 can detect the differential pressure value steplessly.

  The control unit outputs the current degree of filter clogging to an output device (not shown) with a stepless numerical value, indicator display, stepwise LED or illustration display, etc., and recognizes the necessity of maintenance of the filter 11b to the operator. You may make it make it.

  In this way, the control unit causes the operator to perform an operation for recognizing the necessity of maintenance of the filter unit 11 based on the differential pressure value. As a result, it is possible to avoid a situation in which the suction unit 14 breaks down as a result of continuing to operate the suction unit 14 even though the filter 11b is clogged.

  When the operator neglects the maintenance of the filter 11b even though the first to fourth operations are performed by the control unit, the upstream side release valve 19 and / or the downstream side release valve 20 remain open. If it is in this state, suction work cannot be performed. However, depending on the state of the work site, the maintenance of the filter 11b is not always possible. Therefore, the upstream opening valve 19 and / or the downstream opening valve 20 may be manually closed.

  When the upstream side open valve 19 and / or the downstream side open valve 20 are manually closed despite the control unit issuing an alarm, the control unit again detects the differential pressure value exceeding a predetermined threshold value. As a result, the upstream opening valve 19 and / or the downstream opening valve 20 is automatically opened. Therefore, even if the control unit has issued a warning exceeding a predetermined threshold, when the upstream side open valve 19 and / or the downstream side open valve 20 is closed and the alarm is issued again, The operation may be performed so that the operator's work is prioritized by, for example, opening a predetermined time interval until the operation when the predetermined threshold is exceeded is performed again.

  In addition to opening a predetermined time interval, a method of limiting the operation of the sludge suction device 2 step by step by using two or more threshold values for the differential pressure value is also conceivable.

  For example, when the first threshold value is exceeded, the control unit once opens the upstream opening valve 19 and / or the downstream opening valve 20 or reduces the engine speed to protect the suction unit 14. However, when the upstream side open valve 19 and / or the downstream side open valve 20 are manually closed thereafter, the control unit does not issue an alarm until the second threshold value is exceeded. If the second threshold value is exceeded, even if the upstream side open valve 19 and / or the downstream side open valve 20 is manually closed, the upstream side open valve 19 and / or the downstream side is immediately closed. The suction valve 14 may be protected by opening the release valve 20.

  Thus, it is also possible to provide the sludge suction device 2 capable of protecting the suction portion while continuing the operation by the operator by using a combination of one or a plurality of differential pressure value threshold values. .

  Although the present invention has been described in detail above, the above description is merely illustrative of the present invention in all respects and is not intended to limit the scope thereof. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention. The constituent features of the invention disclosed in this specification shall be established as independent inventions. Inventions in which the constituent elements are combined by any combination method are also included in the present invention.

  The present invention is a sludge suction vehicle and a sludge suction device, and can be used industrially.

DESCRIPTION OF SYMBOLS 1 Sludge suction wheel 2 Sludge suction device 3 Suction hose 4 Suction port valve 5 Storage tank part 5a Hatch 6 Pumping port valve 7 Sludge outflow prevention part 8 1st piping 8
9 Secondary catcher 10 Second piping 11 Filter unit 11a Filter case 11b Filter 12 Differential pressure measurement unit 13 Third piping 14 Suction unit 15 Fourth piping 16 Silencer 17 Discharge safety valve 18 Pressure gauge 19 Upstream side open valve 20 Downstream Side release valve 21 Suction pressure switching valve 22 Suction pressure switching valve 23 Suction pressure switching valve

Claims (9)

A sludge suction device that sucks and collects sludge,
A storage tank for storing the sucked sludge;
A suction section for decompressing the storage tank section;
A filter unit provided between the storage tank unit and the suction unit;
A differential pressure measuring unit that detects a difference between an upstream pressure on the storage tank side and a downstream pressure on the suction unit side with respect to the filter unit,
A sludge suction device comprising: a control unit for causing an operator to recognize the necessity of maintenance of the filter unit based on a differential pressure value detected by the differential pressure measurement unit.   The sludge suction device according to claim 1, wherein the control unit outputs an alarm sound based on the differential pressure value detected by the differential pressure measuring unit. A downstream release valve provided on the downstream side of the filter unit;
The sludge suction device according to claim 1 or 2, wherein the control unit opens the downstream release valve based on the differential pressure value detected by the differential pressure measurement unit. An upstream release valve provided on the upstream side of the filter unit;
The sludge suction device according to any one of claims 1 to 3, wherein the control unit opens the upstream release valve based on the differential pressure value detected by the differential pressure measurement unit.   The said control part reduces the rotation speed of the engine for driving the said suction part based on the said differential pressure value which the said differential pressure measurement part detected, The any one of Claims 1-4 characterized by the above-mentioned. The sludge suction device described in 1.   6. The control unit according to claim 1, wherein the control unit notifies the advance notice that the maintenance time of the filter unit is approaching based on the differential pressure value detected by the differential pressure measurement unit. The sludge suction device according to any one of the above.   When the differential pressure value detected by the differential pressure measurement unit exceeds the threshold value, the control unit uses a value equal to or less than an absolute value of 70% of the vacuum pressure that can be suctioned by the suction unit as a threshold value. The sludge suction device according to any one of claims 1 to 6, wherein an operation for causing an operator to recognize the necessity of maintenance of the filter unit is executed. The controller is
As the differential pressure value detected by the differential pressure measuring unit, a threshold value of 2 or more is used,
When the differential pressure value detected by the differential pressure measuring unit exceeds a first threshold, a notice that the maintenance time of the filter unit is approaching is notified,
When the differential pressure value detected by the differential pressure measuring unit exceeds a second threshold value, an alarm sound is output, a downstream release valve provided downstream of the filter unit is opened, or the filter unit The sludge suction device according to claim 1, wherein an upstream side release valve provided on the upstream side of the engine is opened, or an engine speed for driving the suction unit is reduced.   A sludge suction vehicle equipped with the sludge suction device according to any one of claims 1 to 8.