JP6236611B1 - A water quality meter equipped with a cleaning device and a cleaning function attached to the water quality meter - Google Patents

Abstract

Provided is a water quality meter that reliably removes pollutants, prevents failure of a motor, a speed reduction mechanism, etc., improves reliability over a long period of time, and can be manufactured at low cost. A cleaning device is immersed in test water and attached to a sensor unit of a water quality meter for measuring the quality of the test water. A columnar main body 160, a swinging shaft 152 projecting from the front end surface of the main body, a wiper arm 153 provided at the tip of the swinging shaft, and attached to the wiper arm to come into contact with water detection as the swinging shaft rotates forward and backward. A wiper blade 154 that reciprocally swings the surface of the sensing part 122a of the sensor unit and wipes off contaminants adhering to the surface of the sensing part, a stepping motor 151 that is housed in the main body and has a drive shaft directly connected to the swinging shaft, And at least one stopper 155, 156 for restricting the reciprocating range of the wiper arm, and a pulse generator 150 for supplying a pulse to the stepping motor. [Selection] Figure 2

Description

  The present invention relates to a cleaning device mounted on a water quality meter and a water quality meter having a cleaning function.

  Water quality tests such as turbidimeters, pH meters, ORP meters, and dissolved oxygen meters are being used to manage the quality of industrial wastewater and to measure the environment of dams, lakes, and rivers. Since the water quality test is performed continuously, the water quality meter is immersed in the test water for a long period of time, and contaminants contained in the test water adhere to sensitive parts such as the light receiving part and electrode part of the water quality tester. Sometimes. Adhering of pollutants to the sensitive area leads to a decrease in the measurement accuracy of the water quality meter. For this reason, it is desirable to periodically clean the sensitive part. As a method for cleaning the sensitive part, there is known a structure that implements a cleaning method for removing contaminants from the detection part using, for example, water or compressed air (Patent Document 1). However, in the method of blowing away the pollutant adhered to the sensitive part with water or compressed air, it is difficult to apply sufficient pressure because the sensitive part itself is immersed in water, and the removal rate of the pollutant is low. . On the other hand, a method has been proposed in which the pollutant adhered to the sensitive part is scraped off with a wiper (wiping device) that reciprocates (Patent Document 2).

  In the method using a wiper, a direct current or alternating current drive motor is generally used as a wiper drive source. Therefore, a speed reduction mechanism and a cam mechanism are required to perform low-speed rotation and reciprocation suitable for wiper operation. there were. Since such a reduction mechanism or cam mechanism is interposed between the wiper and the motor, when an external force is applied to the wiper arm from the outside during maintenance, the gear part is chipped or cracked due to the load on the reduction gear part. In many cases, attention was required for maintenance.

  Further, since the operation of the wiper arm is hindered by burying in earth and sand or foreign matter being caught, there is a possibility that the motor is overloaded and a failure occurs. Furthermore, if the wiper stops at a position where it comes into contact with the detector when cleaning is completed, an accurate water quality test cannot be performed. Therefore, a position detection mechanism such as a photo interrupter, encoder, or potentiometer is installed inside the device, and the wiper contacts the detector. It was controlled so that it would not stop at the position where However, the position control of the wiper by such a position detection mechanism is complicated, and the number of parts is increased, leading to a problem of increased cost. Furthermore, since there are various types of water quality meters corresponding to the measurement items, it is desirable that the swing angle of the wiper can be easily changed according to the shape and dimensions of the detection unit and according to the installation environment of the water quality meter. However, in the case of a structure in which a position detection mechanism is provided inside the apparatus, it is difficult to adjust the wiper swing angle at the installation site.

JP 2007-190535 A JP 2014-222187 A

  The purpose of the water quality meter equipped with a washing device and a washing function attached to the water quality meter is to remove contaminants reliably, prevent failures of the motor, speed reduction mechanism, etc., improve reliability over a long period of time, and It is to realize low-cost manufacturing.

  The cleaning device is immersed in the test water and attached to a sensor unit of a water quality meter for measuring the quality of the test water. The cleaning device includes a columnar main body, a swinging shaft projecting from the front end surface of the main body, a wiper arm provided at the tip of the swinging shaft, and attached to the wiper arm. A wiper blade that reciprocally swings the surface of the sensing part of the sensor unit in contact with the sensor unit to wipe off contaminants attached to the surface of the sensing part, a stepping motor that is housed in the main body, and the drive shaft is directly connected to the rocking shaft, and the front end of the main body And at least one stopper provided on the surface for regulating a reciprocating range of the wiper arm, and a pulse generator for supplying a pulse to the stepping motor.

  It is possible to reliably remove the pollutant, prevent failures of the motor, the speed reduction mechanism, etc., improve reliability over a long period of time, and manufacture at a low cost.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the washing | cleaning apparatus which concerns on one embodiment of this invention, and the water quality meter which mounts it. The elements on larger scale of FIG. The front view of the washing | cleaning apparatus of FIG. Sectional drawing of the washing | cleaning apparatus of FIG. Explanatory drawing which shows the pulse control pattern of the washing | cleaning apparatus of FIG. Explanatory drawing which shows the time control pattern of the washing | cleaning apparatus of FIG. The front view which shows the modification of the water quality meter of FIG. The front view which shows the modification of the water quality meter of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The water quality meter includes a dissolved oxygen meter that measures the dissolved oxygen concentration, a pH meter that measures the hydrogen ion concentration, a turbidity meter that measures transparency (turbidity), a chromaticity meter that measures chromaticity, and conductivity. There are various types such as a conductivity meter for measuring, a residual chlorine meter for measuring residual chlorine concentration, and the like. The water quality meter measures the measurement object with the sensitive part exposed so as to be in contact with the water sample. Sensitive parts include fluorescent membranes for fluorescent dissolved oxygen meters, diaphragms such as silicon for diaphragm-type dissolved oxygen meters, composite glass electrodes for pH meters, and detection elements (light-receiving elements) for turbidimeters and colorimeters. It is a metal electrode for windows and conductivity meters, and a metal electrode for residual chlorine meters. Here, an embodiment will be described using a turbidimeter as an example of the water quality meter.

  The turbidimeter is installed, for example, under the surface of a settling tank of a factory wastewater treatment facility, and continuously detects pollutants (calcium carbonate, calcium hydroxide, etc.) and measures turbidity. The present embodiment can be applied to any method such as a transmitted light measurement method, a scattered light measurement method, a transmitted light / scattered light calculation method, and the like. Here, the transmission light measurement method will be described.

  1 is a perspective view showing a cleaning device 20 according to an embodiment of the present invention and a sensor unit 100 of a water quality meter 10 equipped with the same, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a front view of the cleaning device 20. FIG. 4 is a cross-sectional view of the cleaning device 20. As shown in FIG. 1, the water quality meter 10 is provided outside the settling tank S and a detection unit (sensor unit) 100 immersed in a settling tank S in which drainage (test water to be tested) H is stored. The control device 200 and a signal cable 300 for performing communication between the sensor unit 100 and the control device 200 are provided. The sensor unit 100 and the control device 200 may be connected by wireless communication such as Bluetooth (registered trademark).

  The sensor unit 100 includes a cylindrical main body 110 having a central axis C. In the main body 110, a recess 120 is cut out in a circular cross section around the central axis C. As shown in FIG. 2, the inner end wall 121 and the inner end wall 122 along the central axis C direction of the recess 120 are provided with a light emission window 121a and a detection window (sensing part) 122a, respectively. The light emission window 121a and the detection window 122a are made of sapphire glass or the like.

  A light source 130 such as an LED is provided at the position facing the light emitting window 121a in the main body 110 toward the detection window 122a. At a position facing the detection window 122a in the main body 110, a detection unit 140 such as a photodiode is provided toward the light emission window 121a. The output of the detection unit 140 is sent to the control device 200 via the signal cable 300.

  The water quality meter 10 measures the turbidity of the wastewater H as follows. That is, the sensor unit 100 is put into the sedimentation tank S that stores the waste water H to be inspected. When the sensor unit 100 is turned on via the pulse generator 150 and the signal cable 300, the light source 130 emits light. Light L from the light source 130 passes through the light emission window 121 a and enters the recess 120. The light L that has entered the recess 120 is light that has passed through the waste water H containing the pollutant, or scattered light that has passed through the detection window 122a and enters the detection unit 140. The detection unit 140 measures the turbidity by analyzing the light L. The measured turbidity signal is input to the control device 200 via the signal cable 300.

  A cleaning device 20 is attached to the sensor unit 100 of the water quality meter 10. The cleaning device 20 can be detached from the sensor unit 100. The cleaning device 20 houses a stepping motor 151 inside a cylindrical main body 160. A swing shaft 152 is directly connected to the drive shaft 157 of the stepping motor 151. The tip portion of the swing shaft 152 protrudes from the front end surface FP of the main body 160. A wiper arm 153 that is orthogonal to the pivot shaft 152 and is pivoted in parallel with the surface of the inner end wall 122 and with a slight distance is coupled to the tip portion of the pivot shaft 152 protruding from the front end surface FP. . A wiper blade (wiping member) 154 made of a resin material that slides on the inner end wall 122 of the sensor unit 100 and cleans the detection window 122a as a sensing unit is attached to the wiper arm 153. A first stopper 155 and a second stopper 156 for restricting the reciprocating range of the wiper blade and the wiper arm 153 are attached to the front end surface FP of the main body 160 on the orbit of the wiper arm 153. The first stopper 155 and the second stopper 156 can be attached at arbitrary positions so that the reciprocating range can be arbitrarily adjusted. A pulse generator 150 is housed in the main body 160 of the cleaning apparatus 20 together with a power supply unit (not shown).

  A single stopper is provided when the reciprocating range of the wiper arm 153 is 360 degrees or its vicinity. Here, a description will be given assuming that two first and second stoppers 155 and 156 are provided. Further, a wiping member such as a brush may be used instead of the wiper blade 154 depending on the type and amount of the pollutant. The operation time for the wiper blade 154 to wipe once is about several seconds, but is not limited to this time.

  The stepping motor 151 rotates by a certain angle (step angle) every time a pulse is supplied from the pulse generator 150. That is, each time a pulse is input, the stator-side coil is sequentially excited, and the rotor-side permanent magnet repels and attracts to generate a rotational force based on the principle of rotating by a step angle. Therefore, control is possible so that the rotation angle is determined according to the number of pulses. The step angle is inherent in the structure of the stepping motor 151, but the main control parameters are the number of pulses for determining the rotation amount (rotation amount = number of pulses × step angle) and the unit time for determining the rotation speed. There are, for example, the number of pulses (pulse frequency, a pulse cycle as the reciprocal of the pulse frequency), a period of continuous and repeated generation of pulses (drive duration), and the like. As is well known, the stepping motor 151 is in a state where the rotor cannot rotate under an overload. This state is called step-out. When step-out occurs, the motor cannot be rotated, but the motor is not broken.

  The pulse generator 150 supplies a pulse to the stepping motor 151 in order to execute the wiping operation at a predetermined timing every hour, for example. The wiping operation | movement of the detection window 122a of the sensor part 100 of the water quality meter 10 by the washing | cleaning apparatus 20 is demonstrated. When a predetermined time elapses from the previous wiping operation, it is expected that a pollutant adheres to the detection window 122a and a measurement error occurs. For this reason, the pulse generator 150 operates the stepping motor 151 for a predetermined time when a predetermined time has elapsed from the previous wiping operation or at a predetermined timing. By the pulse from the stepping motor 151, the wiper arm 153 swings the reciprocating movement range between the first stopper 155 and the second stopper 156 (reciprocating motion) on the swing shaft 152.

  The first stopper 155 and the second stopper 156 are determined by the rotation angle (step angle) δθ per pulse applied to the stepping motor 151 and the angle of the reciprocating movement range between the first stopper 155 and the second stopper 156. The minimum number of pulses required for the wiper blade 154 to move within the range of the reciprocating movement range is determined. That is, the minimum number of pulses (reference pulse number) Pab required for the wiper blade 154 to move through the angle of the reciprocating movement range between the first stopper 155 and the second stopper 156 is Pab = the angle of the reciprocating movement range. / It is given by a step angle, and here, for convenience of explanation, it is assumed that Pab = 100.

Here, for convenience of explanation, the number of pulses Pcw at the time of forward rotation when moving from the first stopper 155 toward the second stopper 156 (during the forward path) is 120, and at the time of reverse rotation when moving from the second stopper 156 to the first stopper 155 (during the backward path) ) Is set to 130. That is, preferably, the relationship is Pab <Pcw <Pccw.
<Forward rotation>
When the wiper arm 153 is at the position of the first stopper 155, the stepping motor 151 is driven by the number of applied pulses Pcw, and the wiper arm 153 reaches the position of the second stopper 156 as shown by a two-dot chain line in FIG. . As described above, since the first stopper 155 to the second stopper 156 arrive at the number of pulses Pab, there are 20 applied pulses. Here, since the wiper arm 153 is in contact with the second stopper 156, the wiper arm 153 cannot be rotated any further even if a rotational force is applied, and the stepping motor 151 is overloaded. For this reason, the stepping motor 151 steps out and the wiper arm 153 stops at the position of the second stopper 156 when all the applied pulse numbers Pcw are applied.

The same operation is performed when the wiper arm 153 is between the first stopper 155 and the second stopper 156. Even when the wiper arm 153 is at the position of the second stopper 156, the stepping motor 151 is stepped out, and the wiper arm 153 stops at the position of the second stopper 156 when all the applied pulse numbers Pcw are applied.
<Reverse>
When the wiper arm 153 is at the position of the second stopper 156, the stepping motor 151 is driven by the applied pulse number Pccw, and the wiper arm 153 reaches the position of the first stopper 155. As described above, since the second stopper 156 to the first stopper 155 arrive at the number of pulses Pab, 30 applied pulses remain. Here, since the wiper arm 153 is in contact with the first stopper 155, the wiper arm 153 cannot be rotated any further even if a rotational force is applied, and the stepping motor 151 is overloaded. For this reason, the stepping motor 151 steps out and the wiper arm 153 stops at the position of the first stopper 155 when all the applied pulse numbers Pccw are applied.

  The same operation is performed when the wiper arm 153 is between the second stopper 156 and the first stopper 155. Even when the wiper arm 153 is at the position of the first stopper 155, the stepping motor 151 is stepped out and the wiper arm 153 stops at the position of the first stopper 155 when all the applied pulse numbers Pccw are applied.

  As described above, the number of forward rotations (forward path) and reverse rotation (return path) is set excessively compared to the number of pulses (reference pulse number) necessary for the wiper arm 153 to move for the following reason. That is, the deposited pollutant may be strongly attached to the detection window 122a. For example, when the wiper arm 153 moves from the first stopper 155 side to the second stopper 156 side and comes into contact with the pollutant, the wiper arm 153 may not move depending on the adherence of the pollutant and the stepping motor 151 may step out. It will be. Due to this step-out, a large load is not applied to the stepping motor 151 and the speed reduction mechanism, and damage can be prevented. On the other hand, the stepped-out pulse does not contribute to the operation of the wiper arm 153. Therefore, even if the pollutant is removed, the pulse does not reach the second stopper 156 and stops with the wiper arm 153 positioned in the detection window 122a. There is a risk of doing. From this, by applying an extra number of pulses, it is possible to increase the probability that the detection window 122a will not be blocked by the wiper arm 153 by reaching the second stopper 156, and the contaminants in the waste water H can be detected accurately. Become. The same applies to the return path in which the wiper arm 153 moves from the second stopper 156 side to the first stopper 155 side. Further, by setting the number of return pulses greater than the number of pulses on the outward path, the wiper arm 153 returns to the first stopper 155 with high accuracy in the return path in which the wiper arm 153 moves from the second stopper 156 side to the first stopper 155 side. become able to.

As shown in FIG. 5, the control pattern, that is, the correlation between the pulse numbers Pab, Pcw, and Pccw, may be adjusted depending on the type of drainage H and the pollutant and the frequency of the wiping operation. However, the pulse numbers Pcw and Pccw are not less than the reference pulse number Pab. In other words, even if some contaminants are attached, the wiper blade 154 can be recovered and moved throughout the entire area even if the wiper blade 154 stops in the middle of the forward path and the backward path and loses its position, and the reference position (the position of the first stopper 155). From the point of view that it can be surely returned to (), it can be said that the control is preferably performed in the relationship of Pab <Pcw <Pccw. However, the pulse generator 150 may control the number of pulses in any of the following relationships.
Pab = Pcw <Pccw; the wiper arm 153 can move in the entire return path with high accuracy. Pab = Pccw <Pcw; the wiper arm 153 can move in the entire area of the forward path with high accuracy. Pab <Pcw = Pccw; The wiper arm 153 can move in the entire area with high accuracy in both the forward path and the backward path. Pab <Pccw <Pcw; The wiper arm 153 can move in the entire area of the forward path with high accuracy, and the accuracy of the return path can be improved over the forward path.

  However, the adoption of the stepping motor itself has the effect of the speed reduction mechanism being damaged or unnecessary. Therefore, the relationship of Pab = Pcw = Pccw is not denied.

  In the pulse generation unit 150, by controlling the number of pulses (frequency) per unit time, it is possible to control the pulse signal application times Tcw and Tccw instead of controlling the number of pulses. For example, the minimum application time Tab required for moving from the first stopper 155 to the second stopper 156 is 5.0 seconds. Here, in the pulse generation unit 150, the application time Tcw at the time of forward rotation for moving from the first stopper 155 toward the second stopper 156 is 6.0 seconds, and at the time of reverse rotation for moving from the second stopper 156 to the first stopper 155. The application time Tccw is set to 7.0 seconds. That is, Tab <Tcw <Tccw.

The application time is obtained by Tab = θab / γθ, where θab is the angle formed by the first stopper 155 and the second stopper 156, and the rotation angle is γθ per second.
<Forward rotation>
When the wiper arm 153 is at the position of the first stopper 155, the stepping motor 151 is driven by the application time Tcw, and the wiper arm 153 reaches the position of the second stopper 156. As described above, since the first stopper 155 to the second stopper 156 arrive at the application time Tab, the application time exceeds 1.0 second. Here, since the wiper arm 153 is in contact with the second stopper 156, the wiper arm 153 cannot be rotated any further even if a rotational force is applied, and the stepping motor 151 is overloaded. For this reason, the stepping motor 151 steps out and the wiper arm 153 stops at the position of the second stopper 156 when all the application time Tcw has elapsed.

The same operation is performed when the wiper arm 153 is between the first stopper 155 and the second stopper 156. Even when the wiper arm 153 is at the position of the second stopper 156, the stepping motor 151 is stepped out and the wiper arm 153 stops at the position of the second stopper 156 when the application time Tcw has elapsed.
<Reverse>
When the wiper arm 153 is at the position of the second stopper 156, the stepping motor 151 is driven by the application time Tccw, and the wiper arm 153 reaches the position of the first stopper 155. As described above, since the time from the second stopper 156 to the first stopper 155 arrives at the time Tab, the application time exceeds 2.0 seconds. Here, since the wiper arm 153 is in contact with the first stopper 155, the wiper arm 153 cannot be rotated any further even if a rotational force is applied, and the stepping motor 151 is overloaded. For this reason, the stepping motor 151 steps out and the wiper arm 153 stops at the position of the first stopper 155 when the application time Tccw is completely applied.

  The same operation is performed when the wiper arm 153 is between the second stopper 156 and the first stopper 155. Even when the wiper arm 153 is at the position of the first stopper 155, the stepping motor 151 is stepped out, and the wiper arm 153 stops at the position of the first stopper 155 when the application time Tccw has elapsed.

  As described above, both forward rotation and reverse rotation are set excessively compared to the application time required for the wiper arm 153 to move, as in the case of the applied pulse described above.

  Note that, as shown in FIG. 6, depending on the type of drainage H and the pollutant and the frequency of the wiping operation, the correlation between the control patterns, that is, the application times Tab, Tcw, and Tccw may be adjusted. However, the application times Tcw and TPccw are not less than the application time Tab.

  As described above, according to the cleaning device 20 according to the present embodiment, it is possible to prevent the detection window 122a from being blocked by the wiper arm 153 without using a position detection mechanism, and to perform accurate turbidity detection. Further, since the position detection mechanism is not used, the degree of freedom such as setting of the swing angle of the wiper arm 153 is increased, and can be applied to the water quality meter 10 having various forms and dimensions. In this apparatus, the first stopper 155 or the second stopper 156 is reached by forward and reverse rotation with a sufficient number of pulses or time, and the excess pulse or time is set by the stepping motor 151 stepping out. I don't hurt. Unlike the position detection mechanism provided in the main body 110, the deflection angle can be set freely by changing the positions of the first stopper 155 and the second stopper 156, and the actual deflection angle is visually confirmed. be able to. Therefore, the cleaning device 20 can reliably remove pollutants and can prevent high-precision measurements, prevent failures of motors, speed reduction mechanisms, etc., maintain reliability over a long period of time, and at a low cost. Can be manufactured.

  FIG. 7 shows a main part of a modified example of the water quality meter 10. 7, the same functional parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted. In the above example, the cleaning device 20 is configured separately from the sensor unit 100 of the water quality meter 10, and the cleaning device 20 is attached to the sensor unit 100 of the water quality meter 10. However, the cleaning device 20 may be configured integrally with the sensor unit 100 of the water quality meter 10. The stepping motor 151 of the cleaning device 20 is housed in the main body 110 of the sensor unit 100 of the water quality meter 10 together with the pulse generation unit and the power supply unit. The swing shaft 152 protrudes from the end surface of the recess 120 of the sensor unit 100. A driving shaft 157 of a stepping motor 151 is directly connected to the swing shaft 152. A wiper arm 153 is coupled to the tip of the swing shaft 152, and a wiper blade 154 is attached to the wiper arm 153. A first stopper 155 and a second stopper 156 that restrict the reciprocating range of the wiper blade and the wiper arm 153 are attached to the end surface of the recess 120 on the orbit of the wiper arm 153.

  As shown in FIG. 8, the multi-item water quality meter 10 ′ includes a plurality of sensitive parts 122 a in the sensor part 100, for example, a fluorescent film for measuring dissolved oxygen, a diaphragm such as silicon for measuring dissolved oxygen, and a composite glass for measuring pH. An electrode, a detection window for measuring turbidity and chromaticity, a metal electrode for measuring conductivity, and a metal electrode for measuring residual chlorine are arranged circumferentially. In this case, the cleaning device is preferably configured integrally with the sensor unit 100 of the water quality meter 10. The stepping motor 151 of the cleaning device is housed inside the main body 110 of the sensor unit 100 of the water quality meter 10 together with the pulse generation unit and the power source unit. The swing shaft 152 is arranged at the center of the arc in which the plurality of sensitive parts 122a are arranged so that the wiper blade 154 can suitably clean the plurality of sensitive parts 122a. In this case, a single stopper 155 is attached to the end surface of the recess 120 so that the reciprocating range of the wiper arm 153 approximates 360 °.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Water quality meter, 100 ... Detection part, 110 ... Main body, 120 ... Recessed part, 121 ... Inner end wall, 121a ... Light emission window, 122 ... Inner end wall, 122a ... Detection window, 130 ... Light source, 140 ... Detection part, 150 ... Pulse generator, 151 ... Stepping motor, 152 ... Oscillating shaft, 153 ... Wiper arm, 154 ... Wiper blade (wiping member), 155 ... First stopper, 156 ... Second stopper, 200 ... Control device, 300 ... Signal cable.

Claims (7)

In the cleaning device that is immersed in the test water and can be attached to the sensor unit of the water quality meter for measuring the water quality of the test water,
A columnar body,
A swing shaft protruding from the front end surface of the main body;
A wiper arm provided at a tip of the swing shaft;
A wiper blade attached to the wiper arm, reciprocatingly swinging the sensitive part surface of the sensor part in contact with the sample water in accordance with forward and reverse rotation of the swinging shaft, and wiping off contaminants attached to the sensitive part surface;
A stepping motor housed in the body and having a drive shaft directly connected to the swing shaft;
At least one stopper provided on a front end surface of the main body and restricting a reciprocating range of the wiper arm;
A pulse generator for supplying pulses to the stepping motor;
The number of pulses obtained by dividing the angle of the reciprocating range by the step angle of the stepping motor is Pab, the number of applied pulses in the reciprocating range is Pcw, and the number of applied pulses in the reciprocating range is Pccw. In this case, the pulse generator supplies the pulse to the stepping motor in a relationship of Pab = Pcw <Pccw. In the cleaning device that is immersed in the test water and can be attached to the sensor unit of the water quality meter for measuring the water quality of the test water,
A columnar body,
A swing shaft protruding from the front end surface of the main body;
A wiper arm provided at a tip of the swing shaft;
A wiper blade attached to the wiper arm, reciprocatingly swinging the sensitive part surface of the sensor part in contact with the sample water in accordance with forward and reverse rotation of the swinging shaft, and wiping off contaminants attached to the sensitive part surface;
A stepping motor housed in the body and having a drive shaft directly connected to the swing shaft;
At least one stopper provided on a front end surface of the main body and restricting a reciprocating range of the wiper arm;
A pulse generator for supplying pulses to the stepping motor;
The number of pulses obtained by dividing the angle of the reciprocating range by the step angle of the stepping motor is Pab, the number of applied pulses in the reciprocating range is Pcw, and the number of applied pulses in the reciprocating range is Pccw. In this case, the pulse generator supplies the pulse to the stepping motor in a relationship of Pab = Pccw <Pcw. In the cleaning device that is immersed in the test water and can be attached to the sensor unit of the water quality meter for measuring the water quality of the test water,
A columnar body,
A swing shaft protruding from the front end surface of the main body;
A wiper arm provided at a tip of the swing shaft;
A wiper blade attached to the wiper arm, reciprocatingly swinging the sensitive part surface of the sensor part in contact with the sample water in accordance with forward and reverse rotation of the swinging shaft, and wiping off contaminants attached to the sensitive part surface;
A stepping motor housed in the body and having a drive shaft directly connected to the swing shaft;
At least one stopper provided on a front end surface of the main body and restricting a reciprocating range of the wiper arm;
A pulse generator for supplying pulses to the stepping motor;
The number of pulses obtained by dividing the angle of the reciprocating range by the step angle of the stepping motor is Pab, the number of applied pulses in the reciprocating range is Pcw, and the number of applied pulses in the reciprocating range is Pccw. In this case, the pulse generator supplies a pulse to the stepping motor in a relationship of Pab <Pcw = Pccw. In the cleaning device that is immersed in the test water and can be attached to the sensor unit of the water quality meter for measuring the water quality of the test water,
A columnar body,
A swing shaft protruding from the front end surface of the main body;
A wiper arm provided at a tip of the swing shaft;
A wiper blade attached to the wiper arm, reciprocatingly swinging the sensitive part surface of the sensor part in contact with the sample water in accordance with forward and reverse rotation of the swinging shaft, and wiping off contaminants attached to the sensitive part surface;
A stepping motor housed in the body and having a drive shaft directly connected to the swing shaft;
At least one stopper provided on a front end surface of the main body and restricting a reciprocating range of the wiper arm;
A pulse generator for supplying pulses to the stepping motor;
The number of pulses obtained by dividing the angle of the reciprocating range by the step angle of the stepping motor is Pab, the number of applied pulses in the reciprocating range is Pcw, and the number of applied pulses in the reciprocating range is Pccw. In this case, the pulse generator supplies the pulse to the stepping motor in a relation of Pab <Pcw <Pccw. In the cleaning device that is immersed in the test water and can be attached to the sensor unit of the water quality meter for measuring the water quality of the test water,
A columnar body,
A swing shaft protruding from the front end surface of the main body;
A wiper arm provided at a tip of the swing shaft;
A wiper blade attached to the wiper arm, reciprocatingly swinging the sensitive part surface of the sensor part in contact with the sample water in accordance with forward and reverse rotation of the swinging shaft, and wiping off contaminants attached to the sensitive part surface;
A stepping motor housed in the body and having a drive shaft directly connected to the swing shaft;
At least one stopper provided on a front end surface of the main body and restricting a reciprocating range of the wiper arm;
A pulse generator for supplying pulses to the stepping motor;
The number of pulses obtained by dividing the angle of the reciprocating range by the step angle of the stepping motor is Pab, the number of applied pulses in the reciprocating range is Pcw, and the number of applied pulses in the reciprocating range is Pccw. In this case, the pulse generation unit supplies a pulse to the stepping motor in a relationship of Pab <Pccw <Pcw. In the cleaning device that is immersed in the test water and can be attached to the sensor unit of the water quality meter for measuring the water quality of the test water,
A columnar body,
A swing shaft protruding from the front end surface of the main body;
A wiper arm provided at a tip of the swing shaft;
A wiper blade attached to the wiper arm, reciprocatingly swinging the sensitive part surface of the sensor part in contact with the sample water in accordance with forward and reverse rotation of the swinging shaft, and wiping off contaminants attached to the sensitive part surface;
A stepping motor housed in the body and having a drive shaft directly connected to the swing shaft;
At least one stopper provided on a front end surface of the main body and restricting a reciprocating range of the wiper arm;
A pulse generator for supplying pulses to the stepping motor;
The pulse generator includes Tab as a time corresponding to an angle of the reciprocating range, a step angle of the stepping motor and a pulse period, Tcw as a driving duration of the stepping motor with respect to a forward path of the reciprocating range, and the reciprocating motion. When the driving duration of the stepping motor for the return path in the range is Tccw, a pulse is supplied to the stepping motor in any of the following relationships: Tab <Tcw = Tccw, Tab <Tcw <Tccw, Tab <Tccw <Tcw Characteristic cleaning device. In a water quality meter for measuring the quality of sample water consisting of a sensor unit and a control unit,
The sensor unit is
A body immersed in the test water;
A sensitive part exposed from the main body so as to come into contact with the sample water;
A cleaning unit attached to or incorporated in the main body,
The cleaning unit
An oscillating shaft;
A wiper arm attached to the tip of the swing shaft;
A wiper blade provided on the wiper arm, reciprocally swinging along the surface of the sensitive part, and wiping off contaminants attached to the surface of the sensitive part;
A stepping motor in which a drive shaft is directly connected to the swing shaft;
At least one stopper for regulating a reciprocating range of the wiper arm;
A pulse generator for supplying pulses to the stepping motor;
The pulse generator is configured such that the number of pulses obtained by dividing the angle of the reciprocating range by the step angle of the stepping motor is Pab, the number of applied pulses in the forward path of the reciprocating range is Pcw, and the return path of the reciprocating range is When the number of applied pulses is Pccw, the pulse generating unit is in any of the relations of Pab <Pcw = Tccw, Pab <Pcw <Pccw, Pab <Pccw <Pcw, or the angle of the reciprocating range and the step of the stepping motor When Tab is a time corresponding to the angle and the pulse period, Tcw is a driving duration of the stepping motor for the forward path of the reciprocating range, and Tccw is a driving duration of the stepping motor for the return path of the reciprocating range. <Tcw = Tccw, Tab <Tcw <Tccw, Tab <Tccw <Tcw Water meter and supplying the pulses to the stepping motor in Kano relationship.

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