JP4438673B2 - Filtration water supply device - Google Patents

Description

  The present invention relates to a filtered water supply device that supplies cooling water to a drilling tool or a cutting tool, and more particularly, filtered water having a function of detecting the amount of foreign matter stored in the device and notifying foreign matter disposal. The present invention relates to a supply device.

  For example, when drilling or excavating concrete or stone, a circulating filtered water supply device that supplies water to the drilling site is known for cooling the drill bit and preventing dust from scattering. For example, the cleaning liquid feeding device described in Patent Document 1 sends water in a first container (water receiving tank) to a second container (pressurized tank) by a pump, and a filter and water supply in the second container. It is the structure which supplies filtered water to tools, such as a drill, through a pipe | tube.

  The first container is provided with a negative pressure generating device that makes the inside of the container have a negative pressure, and water supplied to the tool side is sucked into the first container through the suction pipe. Foreign matter such as cutting powder mixed in the collected water settles in the first container, is captured by the filter in the second container, and the filtered water is sent out again, and the cleaning liquid feeding device, the tool, The water circulates.

  In the above-described cleaning liquid feeding apparatus, foreign matters such as concrete cutting powder settle in the first container and the second container and are captured by the filter in the second container. When the container is cleaned in such an amount, the water in the container must be drained and washed, which takes time to remove foreign matter.

  In order to reduce this effort, the present applicant has proposed a cooling water filtering device that can dispose of foreign matter only by cleaning or replacing the filter (Japanese Patent Application No. 2003-318945). This cooling water filtration device is equipped with a centrifugal dewatering tank that is rotated at high speed by an electric motor in a water tank, and captures foreign matter such as concrete cutting powder with a filter attached to the inner wall surface of the centrifugal dewatering tank. The water supplied into the hollow bit of the concrete drill and discharged from the tip of the bit is sucked and collected into the water tank through the hose by the negative pressure generating means provided in the water tank. Then, when the centrifugal dewatering tank rotates at a high speed, water is diffused to the outside of the centrifugal dewatering tank through the filter and accumulated in the lower part of the water tank, and supplied again into the hollow bit of the concrete drill by the water supply pump. Yes.

With the above configuration, solid matter such as concrete cutting powder is dehydrated and collected in a cylindrical filter, so that the filter can be easily removed by removing the filter from the centrifugal dehydration tank, and the labor required for cleaning is reduced. .
Japanese Patent Laid-Open No. 11-311083

  In the filtered water supply device that supplies cooling water to drilling tools and cutting tools, it is necessary to remove foreign matter when the amount of collected concrete cutting powder or other foreign matter reaches an amount that hinders operation. is there. Therefore, it is convenient to have a function for notifying the user when the amount of foreign matter is detected and the amount reaches a certain amount.

  For example, in order to detect the amount of foreign matter in the centrifugal dewatering type cooling water filtration apparatus described above, a method of detecting the starting load of the centrifugal dewatering tank can be considered. In other words, the time from the start of the centrifugal dewatering tank to the specified number of rotations varies according to the amount of solids accumulated in the centrifugal dewatering tank. Since it takes time to reach the specified rotational speed after activation, the amount of foreign matter can be detected by measuring the time.

  However, the circulating filtered water supply device such as the cooling water filtering device described above has an element in which the load detection value is inaccurate by the above method. This is because the cooling water filtering device includes a power socket for supplying power to the concrete drill combined therewith, the power socket and the concrete drill are connected by a power cable, and a trigger switch for the concrete drill is provided. Is turned on, the concrete drill and the cooling water filtration device are simultaneously activated by the on signal, and a negative pressure generating device such as a motor for driving the centrifugal dewatering tank, a water supply pump, and a negative pressure pump. The muddy water sucked by the negative pressure generator flows into the centrifugal dehydration tank that has started rotating, and the amount of inflow is not constant. It is difficult to determine the weight.

  Then, the technical problem which should be solved arises in order to be able to determine reliably the quantity of the foreign material which the filtered water supply apparatus collect | recovered, and this invention aims at solving the said subject.

  The present invention proposes to solve the above-described problems, and includes a centrifugal dehydration tank provided in the water tank, a negative pressure pump that sucks water from the outside and supplies the water to the centrifugal dehydration tank, and the centrifugal dehydration tank In a filtered water supply device that includes a water supply pump that supplies water that has been centrifuged by the outside to the outside, and supplies filtered water obtained by separating and recovering other solids from the water using a filter installed in the centrifugal dehydration tank. Control means for maintaining the negative pressure pump in a stopped state when the water tank is started, means for measuring the time from the start of the centrifugal dewatering tank, and the load that detects the rotational speed of the centrifugal dewatering tank and sets the detected rotational speed in advance Means to compare with the reference rotation speed for judgment, and if the dewatering tank rotation speed does not reach the reference rotation speed within the reference time, the load warning display or load warning display and operation stop are executed, and the dehydration tank is within the reference time Rotational speed is standard If it reaches the rolling speed and provides a filtered water supply apparatus characterized by comprising a control means for starting the normal operation to start the vacuum pump.

  The filtered water supply apparatus according to the present invention sucks water from the outside into the centrifugal dehydration tank when determining the amount of foreign matter in the centrifugal dehydration tank from the time until the rotation of the dehydration tank reaches the reference rotation speed at the time of activation. Since the rotation speed is detected while the negative pressure pump that supplies water is temporarily stopped, the amount of foreign matter in the centrifugal dehydration tank can be accurately detected without water flowing from the outside.

  The present invention includes a centrifugal dehydration tank in a water tank, a negative pressure pump that sucks water from the outside and supplies the water into the centrifugal dehydration tank, and a water supply that supplies the water centrifuged by the centrifugal dehydration tank to the outside In the filtered water supply device that has a pump and supplies filtered water obtained by separating and recovering other solids from water using a filter installed in the centrifugal dehydration tank, the negative pressure pump is maintained in a stopped state when the centrifugal dewatering tank is started. Control means, means for measuring the time from the start of the centrifugal dehydration tank, means for detecting the rotational speed of the centrifugal dehydration tank, and comparing the detected rotational speed with a preset reference rotational speed for load determination; If the dewatering tank rotation speed does not reach the reference rotation speed within the reference time, the load warning display or load warning display and operation stop are executed, and if the dehydration tank rotation speed reaches the reference rotation speed within the reference time, it is negative. Start the pressure pump normally By providing control means for starting the rotation, to achieve the objective of filtered water supply device to be able to reliably determine the amount of foreign substances collected.

  In FIG. 1, 1 is a filtered water supply device, and 51 is an electric concrete drill. A water supply pump 2 disposed on the outer periphery of the filtered water supply device 1 and a water intake 52 of the concrete drill 51 are connected by a hose h1, and a cup-type guide 53 serving as a drill guide and water collecting member at the tip of the concrete drill 51 is connected. And a water inlet 3 on the upper outer peripheral surface of the filtered water supply device 1 are connected by a hose h2. Although not shown, the power cord of the filtered water supply device 1 is connected to a general commercial power source, and the power cord of the concrete drill 51 is connected to the power socket provided in the filtered water supply device 1, so that the filtered water supply device Power is supplied to the concrete drill 51 from the power socket 1.

  The cup-type guide 53 of the concrete drill 51 is fixed to a slide shaft 54, and the slide shaft 54 is inserted into a cylindrical slide guide 55 provided in the drill body, and a spring (not shown) in the cylindrical slide guide 55 ), The slide shaft 54 and the cup-type guide 53 protrude forward (downward in FIG. 1). During the drilling operation, the cup-type guide 53 is pressed against the surface to be drilled, and the cup-type guide 53 is pushed toward the drill body as the drill bit 56 penetrates into the surface to be drilled. At this time, the water supplied to the concrete drill 51 from the feed water pump 2 of the filtered water supply device 1 is jetted to the drilling target surface through the inside of the hollow drill bit 56 to cool the drill bit 56 and the drilling target surface. To do. The injected water is collected from the cup-type guide 53 to the filtered water supply device 1 through the hose h2, filtered in the filtered water supply device 1, and then supplied again from the water supply pump 2 to the concrete drill 51. In the figure, 57 is a trigger switch.

  FIG. 2 shows the filtered water supply device 1, in which a dewatering tank drive motor 6 is fixed in a vertical position at the center of a bottom plate portion 5 of a water tank 4 that also serves as a housing, and a cylindrical shape is attached to the shaft of the dewatering tank drive motor 6. A centrifugal dewatering tank 7 is connected. A removable upper lid 8 is attached to the upper part of the centrifugal dewatering tank 7, and the hollow support shaft 10 passes through the central hole of the dish-shaped cap 9 placed on the upper lid 8 from above. The hollow support shaft 10 is attached to the center of the bucket portion 11 above the centrifugal dewatering tank 7, and the upper portion of the hollow support shaft 10 and the water inlet 3 are connected by a pipe.

  A vacuum pump 12 is mounted on the upper surface of the bucket 11 as a negative pressure pump, and the vacuum pump 12 discharges the air in the water tank 4 to the outside so that the water tank 4 has a negative pressure. External water is sucked into the water tank 4 through 3, and the sucked water falls into the centrifugal dewatering tank 7 through the hollow support shaft 10.

  The vacuum pump 12 and the bucket unit 11 are integrally coupled and can be attached to and detached from the water tank 4. By removing the bucket unit 11 and the top cover 8 of the centrifugal dewatering tank 7, the filter described below can be transferred to the centrifugal dewatering tank 7. Can be installed or replaced.

  FIG. 3 shows a filter 21 in which a porous sponge sheet made of, for example, polyethylene or polypropylene is used to remove solid matter from sewage mixed with solid matter such as concrete powder. In the center of the upper surface, a small-diameter neck portion 22 and a flange portion 23 larger in diameter than the neck portion 22 are provided, and the central hole 24 of the neck portion 22 and the flange portion 23 serves as an inlet for water. ing.

  Remove the bucket 11 of the filtered water supply apparatus 1 shown in FIG. 2, the upper lid 8 of the centrifugal dewatering tank 7, and the dish-shaped cap 9, and install the filter 21 into the centrifugal dewatering tank 7, and the flange 23 of the filter 21 is covered with the upper lid. When the upper lid 8, the dish-shaped cap 9, and the bucket portion 11 are attached by pulling upward from the center hole of 8, the flange portion 23 is sandwiched between the upper lid 8 and the dish-shaped cap 9 thereon. All foreign matters such as underwater concrete debris collected during operation of the filtered water supply device 1 are accumulated in the filter 21, and the filter 21 can be easily attached and detached, so that it is easy to dispose of foreign matters and to clean and replace the filter.

  When the filtered water supply device 1 is used, water is poured into the water tank 4 to a level lower than the bottom surface of the centrifugal dewatering tank 7. During operation, this water is supplied to the concrete drill 51 through the water absorption pump 2, and the water collected into the water tank 4 by the vacuum pump 12 falls into the centrifugal dehydration tank 7, and the centrifugal dehydration tank 7 rotates to filter. The water filtered at 21 accumulates below the centrifugal dewatering tank 7 and is supplied to the concrete drill 51 again.

  Next, the foreign matter amount detection function of the filtered water supply device 1 will be described. The control unit of the filtered water supply device 1 controls the dehydration tank drive motor 6 that rotates the centrifugal dehydration tank 7, the feed water pump 2, and the vacuum pump 12, but the vacuum pump 12 or the vacuum pump 12 at startup A control program or a control circuit for sequentially measuring the rotation speed of the centrifugal dewatering tank 7 and a rotation speed detection circuit of the centrifugal dewatering tank 7 are provided with both the water supply pumps 3 kept in a stopped state for a certain period of time.

  The vacuum pump 12 is kept stopped for a certain period of time when the vacuum pump 12 is started.When the amount of foreign matter is detected, water is introduced into the centrifugal dehydration tank 7, and the detected load of the centrifugal dehydration tank 7 is detected by the inflowing water. Because it is affected. In addition to literally not driving the vacuum pump 12, keeping the vacuum pump 12 stopped literally opens the relief valve of the vacuum pump 12 communicating with the atmosphere while driving the vacuum pump 12. It may be that no negative pressure is generated in 1, and the method of controlling on / off of suction by opening and closing the relief valve has a better start of the water supply operation after load detection.

  The control unit operates with a reference rotational speed lower than the maximum rotational speed of the centrifugal dewatering tank 7 and a drive load of the centrifugal dewatering tank 7 exceeding the normal range, that is, the amount of foreign matter such as concrete debris in the centrifugal dewatering tank 7. In the case of the amount to be hindered, a reference time shorter than the time to reach the reference rotation speed from the start is set. For example, if the maximum rotation speed of the centrifugal dehydration tank is about 1000 rpm / min or more, the reference rotation speed is set to 400 rpm / min, for example. If it takes about 5.8 seconds to reach, the reference time is set to a shorter time, for example, 5 seconds or 4 seconds.

  FIG. 4 shows a control routine at the time of startup. When the filtered water supply device 1 and the concrete drill 51 are connected by a hose and the main switch of the filtered water supply device 1 is turned on (step 101), the filtered water supply device 1 The control unit activates the centrifugal dewatering tank drive motor 6, and a timer in the control unit starts counting (step 102). Further, the measurement of the number of revolutions per hour (rpm / min) of the centrifugal dewatering tank 7 is started (step 103).

  At this time, if the trigger switch 57 of the concrete drill 51 is operated and the ON signal is input to the filtered water supply device 1 (step 104), the water supply pump 2 is activated to start water supply to the concrete drill 51 ( Step 105), the measured rotational speed (rpm / min) of the centrifugal dewatering tank 7 is compared with the reference rotational speed (Step 106). Also, when the trigger switch 57 is in the OFF state, the routine proceeds to step 106.

  Then, the rotation speed measurement is continued until the rotation speed reaches the reference rotation speed, during which the trigger switch 57 of the concrete drill 51 is monitored (step 104). When the rotation speed reaches the reference rotation speed, the set reference time is compared with the arrival time (step 107).

  If the time that the centrifugal dewatering tank 7 has reached the reference rotational speed is longer than the set reference time, the process proceeds from step 107 to step 108 to stop driving the centrifugal dewatering tank 7 and use a warning light such as an LED. A warning is displayed and the removal of foreign matter in the centrifugal dehydration tank is promoted. At that time, the timer counter that has been counted up is cleared.

  If the time when the centrifugal dewatering tank 7 reaches the reference rotation speed is within the set reference time, the process proceeds from Step 107 to Step 109, and the filtered water supply device 1 is in a state capable of sucking sewage. Also, the timer counter is cleared. When the on signal of the trigger switch 57 of the concrete drill 51 is detected, the process proceeds from step 110 to step 111, where the vacuum pump 12 is activated and the water supply pump 2 is not activated (in step 104, the trigger on signal is If not detected), the water supply pump 2 is also started to start normal operation.

  In this way, a warning is displayed before the foreign matter in the centrifugal dehydration tank is full, so removing the foreign matter or cleaning or replacing the filter according to the display will overload the dehydration mechanism and cause a failure. You can prevent it from happening.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it is natural that the present invention extends to those modifications. Further, even in a filtration device that does not have a centrifugal dehydration tank, such as the cleaning liquid feeding device described in Patent Document 1, the water suction means similar to the negative pressure pump in the present invention is stopped to detect the pressure feeding load. Is effective in improving load detection accuracy.

The system block diagram of a concrete drill and filtered water supply apparatus. Sectional drawing of a filtered water supply apparatus. The perspective view of the filter used for a filtered water supply apparatus. The control flow figure at the time of starting of the filtered water supply apparatus of this invention.

Explanation of symbols

1 Filtration water supply device
2 Water supply pump
3 Water inlet
4 Water tank
5 Bottom plate
6 Dewatering tank drive motor
7 Centrifugal dehydration tank
8 Upper lid
9 Dish cap
10 Hollow support shaft
11 Bucket
12 Vacuum pump
21 Filter
51 Concrete drill
52 Water intake
53 Cup type guide
56 Drill bit
57 Trigger switch

Claims (1)

Provided with a centrifugal dehydration tank in the water tank, a negative pressure pump that sucks water from the outside and supplies the water into the centrifugal dehydration tank, and a water supply pump that supplies the water centrifuged by the centrifugal dehydration tank to the outside, In a filtered water supply device that supplies filtered water obtained by separating and recovering other solids from water using a filter mounted in a centrifugal dehydration tank,
Control means for maintaining the negative pressure pump in a stopped state when the centrifugal dehydration tank is started, means for measuring time from the start of the centrifugal dehydration tank, and detecting the number of rotations of the centrifugal dehydration tank, and setting the detected number of rotations in advance If the rotation speed of the dehydration tank does not reach the reference rotation speed within the reference time, the load warning display or the load warning display and the operation stop are executed and the operation is stopped within the reference time. A filtered water supply apparatus comprising control means for starting a normal operation by starting a negative pressure pump when the dehydrating tank rotational speed reaches a reference rotational speed.

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