JP3982747B2 - Wiper drive device and wiper drive control method for construction machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiper drive device and a wiper drive control method for a construction machine.
[0002]
[Prior art]
A cab front window of a construction machine having a work machine is generally formed in a width and a shape so that a moving range of the work machine can be visually recognized. For example, in a cab front window of a hydraulic excavator, The cab is disposed so as to be able to turn with the work machine so that the lateral movement range can be seen, and a substantially rectangular cab front window elongated vertically so as to look over the vertical movement range of the work machine.
[0003]
In addition, the cab front window is provided with a wiper in preparation for rainy weather, but when one wiper is provided in a substantially rectangular window that is long in the vertical direction, wiping is left behind. As a result, during work in rainy weather, the operator carefully looks at the moving range of the work implement with the face close to the window, and fatigue increases.
[0004]
As a means for solving the above problem, a wiper driving device composed of a plurality of wipers has been considered. For example, in Japanese Patent Application Laid-Open No. 2001-247014, two wiper shafts have their wiper shafts opposed to a window frame. A wiper drive device for a construction machine arranged so as to be located at a side is disclosed.
[0005]
20 to 21 show a wiper driving device described in the above-mentioned Japanese Patent Application Laid-Open No. 2001-247014. An example of a conventional wiper driving device for construction equipment will be described with reference to FIG. FIG. 20 is a front view of a wiper driving device according to the prior art, and FIG. 21 is a schematic diagram illustrating the overall configuration of the wiper driving device.
[0006]
20, the wiper shaft 72A of the upper wiper 80A is disposed on the upper side of the window frame 68 of the front window 67 of the cab 66, and the wiper shaft 72A of the lower wiper 80B is disposed on the lower side of the window frame 68, respectively. The parallel wiper arms 72 and 72 are attached to the upper and lower wiper shafts 72A and 72A, respectively. The tracks 83A and 83B of the upper wiper blade 81A and the lower wiper blade 81B attached to the wiper arms 72 and 72 are configured to overlap each other in the center so that there is no unwiped residue.
[0007]
In FIG. 21, an arm 72B is attached to the other end on the inner side of the window frame 68 (see FIG. 20) of the wiper shaft 72A of the upper wiper 80A, and the arm 72B is rotated in the direction of arrow n by a circuit 91A from the controller 90. A crank arm (not shown) of the motor 71 and a link 74 are configured to repeatedly swing left and right. Further, limit switches 92A and 92C for detecting the left and right stroke ends of the arm 72B are provided, and detection signals of the limit switches 92A and 92C are input to the controller 90 via circuits 93A and 93C, respectively. .
[0008]
Further, the lower wiper 80B is driven in the same manner, and limit switches 92B and 92D for detecting the left and right stroke ends of the arm 72B are provided, and the detection signals of the limit switches 92B and 92D are supplied to the circuits 93B and 93D, respectively. Via the controller 90. Further, a wiper switch 75 for commanding the operation and non-operation of the wiper driving device is connected to the controller 90.
[0009]
In the above configuration, when the wiper switch 75 is turned ON, driving is started from one of the upper and lower wiper arms 80A and 80B, and this is detected when the wiper arm 72 reaches the left or right stroke end. The wiper arm 72 is stopped by the detection signal of the limit switch, and the driving of the other wiper arm 72 is started. As a result, the upper and lower wipers 80A and 80B are driven alternately every one way (hereinafter referred to as ½ cycle), so that they do not interfere with each other.
[0010]
Further, by selectively using only the signals of the limit switches 92A and 92B by the selection switch 78, the upper and lower wipers 80A and 80B can be alternately driven for each reciprocation (hereinafter referred to as one cycle). It is said that.
[0011]
20 to 21, the trajectories 83A and 83B of the wiping surface portions of the upper and lower wipers 80A and 80B can be overlapped with each other. It is said that it is possible to provide a wiper drive device for a secured construction machine.
[0012]
[Problems to be solved by the invention]
However, in the above configuration in FIGS. 20 to 21, the wiper driving device is configured on the premise that the window 67 is always wiped by both the upper and lower wipers 80 </ b> A and 80 </ b> B. As a result, there remains a problem in visibility. ing. The problem will be described in detail below with reference to FIG.
FIG. 22 is a diagram showing the movement of the wiper on the time axis in the conventional wiper driving device. Note that the same components as those in FIGS. 20 to 21 are denoted by the same reference numerals, and description thereof will be omitted.
[0013]
In FIG. 22, the time chart on the right side shows the movements of the tip portions 82A and 82B of the wiper blades 81A and 81B of the upper and lower wipers 80A and 80B on the time axis by curves 82C and 82D, respectively. Here, the upper and lower wipers 80A and 80B are intermittently driven such that one drive time is equal to the other waiting time R. As a result, the wiper must be driven intermittently even in the rain that falls down. In this case, until the raindrops are wiped off as before, the operator must look closely and look forward. growing.
[0014]
In FIG. 22, if only the upper wiper 80A is continuously driven alone, a relatively large area below the locus 83A of the wiping surface portion of the upper wiper 80A is left unwiped. The field of view from the window 67 for looking over and confirming the movement range is not sufficient, and the operator needs a posture to bring his face close to the window 67, which increases fatigue.
This problem becomes more prominent when the cab width is restricted and the window 67 has an elongated shape in a small and medium-sized machine.
[0015]
The present invention has been made paying attention to the above problems, and shortens the mutual waiting time of at least two wipers having overlapping regions where adjacent wiping surfaces partially overlap, thereby increasing the driving frequency of the wipers. Wiper drive device and wiper drive control for construction machines that can improve the field of view of the window and secure a view that allows the wiper surface of one wiper to be set wide so that the range of movement of the work machine can be viewed even when the wiper alone is driven. It aims to provide a method.
[0016]
[Means, actions and effects for solving the problems]
  In order to achieve the above object, according to a first aspect of the present invention, in the wiper drive control method for a construction machine, there is an overlapping region in which two adjacent wiping surfaces partially overlap among a plurality of wipers provided in a cab window. When one of the two wipers leaves the overlap area, the other wiper is driven.The one wiper is continuously driven at the next stroke end after being separated from the overlap area, and is driven again toward the overlap area, and the other wiper is connected again to the overlap area. Until it reaches, the overlap area is left and it stops at the next stroke endIt's a way.
[0017]
  According to the first aspect of the invention, when one wiper leaves the overlapping area without waiting for the stroke end to stop, the other wiper is driven. Time can be shortened. For this reason, the number of times the wiper is driven is increased, and visibility from the window can be improved.In addition, since one wiper can be driven continuously without waiting for the other wiper to stop, one wiper has no waiting time, thereby further reducing the waiting time of the other wiper, The number of times the wiper is driven can be increased, and the visibility of the wiping surface can be improved.
[0020]
  First2The invention is the firstInventionIn the wiper drive control method for a construction machine, when the one wiper approaches a predetermined distance before the overlap area, the one wiper is continuously driven only when the other wiper leaves the overlap area. It is said.
[0021]
  First2According to the invention, it is possible to reliably prevent interference in the overlapping region of both wipers.
[0022]
  First3Invention2In the wiper drive control method for a construction machine according to the invention, when the one wiper approaches a predetermined distance before the overlap area, if the other wiper does not leave the overlap area, the one wiper is temporarily moved. When the other wiper leaves the overlap area after the stop, one wiper is driven again.
[0023]
  First3According to the invention, when the other wiper has not left the overlapping area, it is possible to start driving one wiper, and when one wiper approaches a predetermined distance before the overlapping area, Even when the wiper has not left the overlapping region, one wiper is temporarily stopped until it is released, and then the wiper is driven again. Therefore, wiper control without loss time can be performed while reliably avoiding interference between both wipers. Thereby, the waiting time of the wiper can be further shortened.
[0031]
Based on the above results, the wiper surface of one wiper is set wide to ensure visibility so that the range of movement of the work machine can be seen even with single drive of one wiper, and to ensure visibility during down work such as deep groove excavation It is possible to provide a wiper drive device and a wiper drive control method for a construction machine that reduce the waiting time of both wipers and reduce operator fatigue in both drive with the other wiper.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the first to fifth embodiments of the present invention will be described in detail with reference to FIGS.
[0033]
First, the first embodiment will be described with reference to FIGS.
FIG. 1 is a side view of a hydraulic excavator of an example of an application machine of the present invention, FIG. 2 is a front view of a wiper driving device according to the present invention, is an E view of FIG. 1, and FIG. FIG. 3 (A) is a front view thereof, and FIG. 3 (B) is a bottom view thereof.
[0034]
In FIG. 1, a hydraulic excavator 1 is provided with a swing frame 4 on a traveling device 2 so as to be swingable. On the swing frame 4, a work machine 5 is provided at a substantially central front portion and a bed frame 6 is disposed on a left side of the front portion. Cabs 7 are provided respectively.
[0035]
In FIG. 2, the wiper shaft 22 of the upper wiper 10 is provided on the left and right sides (here, the left side) of the window frame 7a of the front window 8 of the cab 7, and the wiper arm 11 attached to the wiper shaft 22 is moved up and down. A wide wiping surface 10a is realized by swinging.
[0036]
Further, since the wiping surface 10a of the upper wiper 10 is widened, the installation position of the wiper shaft 22 of the lower wiper 20 having the wiping surface 20a sharing the wiping surface overlapping region 19 at the lower portion of the wiping surface 10a is more than the window frame 7a. Is also a side surface portion of the bed frame 6 positioned below, but relative displacement is generated between the bed frame 6 and the cab 7 by a vibration isolator (for example, an oil-filled mount) 9. The wiper shaft 22 is locked to the cab 7 side via a bracket 29 (details will be described later with reference to FIG. 3).
[0037]
In FIG. 3, a bracket 29 is fastened to the lower surface of the floor 7b of the cab 7 with screws 29b. A lever 23 is attached to one end of the boss 29a disposed on the bracket 29, and the wiper shaft 22 is rotatably inserted. Further, the lever 23 is connected to a crank arm 25a or a crank disk 25b of a motor 26 with a reduction gear attached to the bracket 29 by a link 24, whereby the lever 23 and the crank 23 are rotated by the rotation of the motor 26 with a reduction gear. The wiper shaft 22 swings back and forth in the left-right direction.
[0038]
Further, the other end portion 22a of the wiper shaft 22 and a mounting hole portion (not shown) of the wiper arm 21 (see FIG. 2) are subjected to vertical groove processing (hereinafter referred to as knurl processing), and the wiper arm 21 is attached to the lever 23. On the other hand, it is fixed to the wiper shaft 22 and swings at a predetermined phase angle. Since the upper wiper 10 is driven in the same manner, a detailed description of the drive unit is omitted.
[0039]
FIG. 4 is a schematic diagram illustrating the overall configuration of the wiper drive device according to the first embodiment. In the wiper drive device 41 of FIG. 4, the wiper shaft 22 of the upper wiper 10 is fixed to the wiper arm 11 at one end and the arm 23 to the other end with a predetermined phase angle therebetween. Similarly, a wiper arm 21 is fixed to one end of the wiper shaft 22 of the lower wiper 20 and an arm 23 is fixed to the other end with a predetermined phase angle therebetween. The upper wiper 10 is provided with a limit switch 31 that detects the upper stroke end of the arm 23, and the lower wiper 20 is provided with a limit switch 32 that detects either the left or right stroke end of the arm 23.
[0040]
Further, the motor 26 of the upper wiper 10 is connected to the controller 50 by a circuit 26a, the limit switch 31 is connected by a signal circuit 31a, the motor 26 of the lower wiper 20 is connected by a circuit 26b, and the limit switch 32 is connected by a signal circuit 32a. Further, a wiper switch 58 is connected to the controller 50, and the wiper switch 58 allows selection of either one of the upper wiper 10 and the lower wiper 20, independent drive, both drive, or both stop (wiper drive off). It is said.
[0041]
Next, the control method of the first embodiment will be described with reference to FIGS.
FIG. 5 is a flowchart showing the control method of the first embodiment, and FIG. 6 is a time chart showing the movement of the wiper by the control method of the first embodiment. The same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and the description thereof will be omitted.
[0042]
In FIG. 6, the movements of the tips P and Q of the lower wipers 10 and 20 driven by the control method 51 of the flowchart shown in FIG. 5 are indicated by curves P1 and Q1 on the time axis, respectively, and the vertical axis Represents the vertical position of the tips P and Q. In FIG. 6, step numbers S1 to S6 of the flowchart of the control method 51 are added to corresponding positions on the curves P1 and Q1.
[0043]
The control method will be described based on the flowchart of FIG. 5 with reference to FIG. Here, the case where both the upper and lower wipers 10 and 20 are driven will be described, and the selection of both drive modes is referred to as “ON of the wiper switch 58”, and the same applies hereinafter.
In step S1, it is checked whether the wiper switch 58 is ON. If it is ON, the upper wiper 10 is driven in step S2. In step S3, it is checked whether the limit switch 31 is activated (ON). If the limit switch 31 is not turned on, the process waits until it is repeatedly turned on from step S2. Next, when the limit switch 31 is turned on, it is determined that the upper wiper 10 has made one reciprocation (hereinafter referred to as one cycle), and the upper wiper 10 is stopped and the lower wiper 20 is driven in step S4. In step S5, the process waits repeatedly from step S4 until the limit switch 32 is turned on. When the limit switch 32 is turned on, it is determined that the lower wiper 20 has completed one cycle of operation, the lower wiper 20 is stopped in step S6, and the process returns to step S1. When the ON state of the wiper switch 58 is confirmed in step S1, the above process is repeated. When the wiper switch 58 is not ON, this control process is terminated.
[0044]
According to the control method 51 of the first embodiment, the upper wiper 10 and the lower wiper 20 have the overlapping areas 19 of the wiping surfaces that partially overlap each other, but when any one wiper leaves this overlapping area, In the example, since the other wiper is driven at the stroke end, as shown in FIG. 6, the upper wiper 10 and the lower wiper 20 are driven with a waiting time of U1 and V1 and enter the overlapping region 19 at the same time. Without interfering with each other.
[0045]
Next, a second embodiment will be described with reference to FIGS.
FIG. 7 is a schematic diagram for explaining the configuration of the wiper driving device of the second embodiment, FIG. 8 is a flowchart showing the control method of the second embodiment, and FIG. 9 shows the wiper according to the control method of the second embodiment. It is a time chart showing a motion. Note that the same components as those in FIGS. 4 to 6 are denoted by the same reference numerals, the description thereof will be omitted, and only different configurations will be described.
[0046]
In the wiper drive device 42 of FIG. 7, the lower wiper 20 is provided with limit switches 32 and 33 for detecting the left and right stroke ends of the arm 23, respectively. The limit switches 32 and 33 are signal circuits 32a and 33a, respectively. Is connected to the controller 50.
[0047]
Next, a control method 52 of the wiper drive device 42 will be described with reference to FIGS. In FIG. 8, the same process as the process of each step shown in FIG. 5 is given the same step S number, and only the step S5a is different from the flowchart of FIG. That is, in step S5a of the present embodiment, the process repeatedly waits from step S4 until either one of the left and right limit switches 32, 33 is turned on, and when either of the limit switches 32, 33 is turned on, the lower wiper 20 is 1 / It is determined that the two-cycle operation is completed, and the lower wiper 20 is stopped in step S6 and the process returns to step S1.
[0048]
In FIG. 9, the movements of the tips P and Q of the lower wipers 10 and 20 driven by the control method 52 of the flowchart shown in FIG. 8 are indicated by curves P2 and Q2 on the time axis, respectively. Represents the vertical positions of the tips P and Q. In FIG. 9, step numbers S1 to S5a and S6 in the flowchart of the control method 52 are appended to corresponding positions on the curves P2 and Q2. Here, the curve Q2 has a length of ½ cycle due to the logic in step S5a.
[0049]
According to the wiper driving device 42 and the control method 52 of the second embodiment, the upper wiper 10 and the lower wiper 20 have the overlapping area 19 of the wiping surface that partially overlaps each other, and any one wiper leaves this overlapping area. In this example, as shown in FIG. 9, when the lower wiper 20 is at both stroke ends, the upper wiper 10 is driven in units of one cycle, and the upper wiper 10 is on the cycle start side. Since the lower wiper 20 is driven in units of ½ cycle when at the stroke end, the waiting time U2 of the upper wiper 10 can be shortened compared to the first embodiment.
[0050]
Next, a third embodiment will be described with reference to FIGS.
FIG. 10 is a schematic diagram illustrating the configuration of the wiper driving device according to the third embodiment, FIG. 11 is a flowchart illustrating the control method according to the third embodiment, and FIG. 12 illustrates the wiper according to the control method according to the third embodiment. It is a time chart showing a motion. In addition, the same code | symbol is attached | subjected to the same component as FIGS. 1-9, and description below is abbreviate | omitted.
[0051]
In the wiper driving device 43 of FIG. 10, the position at which the wiper arm 11 of the upper wiper 10 descends from the uppermost position and goes up over 1/2 cycle (lowermost position) to leave the overlapping area 19 of the wiping surface is a checkpoint CP1. The cam portion 25c is formed at an arbitrary position on the outer periphery of the crank disk 25b of the upper wiper 10, and the angle corresponding to the check point CP1 exceeds 1/2 cycle in the rotational direction from the angular position of the cam portion 25c. A limit switch 46 is disposed at the angular position advanced to the end. When the wiper arm 11 passes (rises) the check point CP1 position, the limit switch 46 is activated so that the pulse signal is transmitted to the controller 50 via the circuit 46a.
[0052]
The lower wiper 20 is provided with a limit switch 32 for detecting either the left or right stroke end of the arm 23, and the limit switch 32 is connected to the controller 50 by a signal circuit 32a.
[0053]
In FIG. 12, the movements of the tips P and Q of the lower wipers 10 and 20 driven by the control method 53 of the flowchart shown in FIG. 11 are indicated by curves P3 and Q3 on the time axis, respectively. Step numbers S11 to S20 in the flowchart of the control method 53 are appended to corresponding positions on P3 and Q3.
[0054]
Next, a control method 53 of the wiper driving device 43 will be described with reference to FIGS.
In step S11, it is checked whether the wiper switch 58 is ON. If the wiper switch 58 is ON, the upper wiper 10 is driven in step S12, and then in step S13, the ON signal (pulse) of the limit switch 46 is input from step S12. Wait repeatedly. Thereafter, when the limit switch 46 is turned on, it is determined that the upper wiper 10 has passed the check point CP1, and then the driving of the lower wiper 20 is started in step S14, and the driving of the upper wiper 10 is continued in step S15.
[0055]
In step S16, it is checked whether the limit switch 31 is ON. The process is repeated from step S15 until the limit switch 31 is turned ON. If ON, it is determined that the upper wiper 10 has completed one cycle, and the upper wiper 10 is stopped in step S17. In step S18, the driving of the lower wiper 20 is continued. Next, in step S19, it is checked whether the limit switch 32 is turned on. The process is repeated from step S18 until the limit switch 32 is turned on. When the limit switch 32 is turned on, it is determined that one cycle of the lower wiper 20 is completed. It stops and returns to step S11 and repeats the above process. Note that when the wiper switch 58 is not ON in step S11, the present control process is terminated.
[0056]
According to the third embodiment, as shown in FIG. 12, since the upper wiper 10 swings up and down, it takes a long time not to be in the overlapping area 19 of the wiping surface. The lower wiper 20 is driven at the same time when it is detached, thereby reducing both the waiting time U3 of the upper wiper 10 and the waiting time V3 of the lower wiper 20 as compared with the first embodiment.
[0057]
Next, a fourth embodiment will be described with reference to FIGS.
FIG. 13 is a schematic diagram for explaining the configuration of the wiper driving device of the fourth embodiment, FIG. 14 is a flowchart showing the control method of the fourth embodiment, and FIG. 15 shows the movement of the wiper by the control method of the fourth embodiment. It is a time chart. The same components as those in FIGS. 10 to 12 are denoted by the same reference numerals, and the description thereof will be omitted.
[0058]
In the wiper drive device 44 of FIG. 13, limit switches 32 and 33 for detecting the left and right stroke ends of the arm 23 of the lower wiper 20 are provided, and the limit switches 32 and 33 are connected to the controller 50 by circuits 32a and 33a, respectively. Has been.
[0059]
The control method 54 in the fourth embodiment differs from the control method 53 (see FIG. 11) in the third embodiment only in step S19a of the flowchart. That is, in step S19a, it is checked whether one of the left and right limit switches 32 and 33 is turned on. The process is repeated from step S18 until it is turned on. When turned on, it is determined that the lower wiper 20 has completed 1/2 cycle. In step S20, the lower wiper 20 is stopped and the process returns to step 11.
[0060]
FIG. 15 shows the movements of the tips P and Q of the lower wipers 10 and 20 driven by the control method 54 on the time axis as curves P4 and Q4, respectively, on the curves P4 and Q4. Step numbers S11 to S19a and S20 in the flowchart are added to the corresponding positions. Here, the curve Q4 has a length of ½ cycle by the process of step S19a.
[0061]
According to the fourth embodiment, as shown in FIG. 15, in addition to starting the driving of the lower wiper 20 when the upper wiper 10 leaves the overlapping region 19, the driving of the lower wiper 20 is performed in units of 1/2 cycle. Thus, the waiting time U4 of the upper wiper 10 is further shortened compared to the third embodiment.
Further, the low waiting time U4 is a waiting time at a position where the upper wiper 10 is at the upper standby point and the movement is small, and thus the movement of the upper wiper 10 gives an impression close to continuous driving. That is, the curves P4 and P4 have a shape resembling a continuous sine curve, and smooth movement can be achieved.
[0062]
Next, a fifth embodiment will be described with reference to FIGS.
FIG. 16 is a schematic diagram for explaining the configuration of the wiper driving device of the fifth embodiment, FIG. 17 is a flowchart showing the control method, FIG. 18 is a detailed flowchart of some steps of FIG. 19 is a time chart showing the movement of the wiper by the control method. Note that the same components as those in FIGS. 13 to 15 are denoted by the same reference numerals, and description thereof will be omitted.
[0063]
In the wiper driving device 45 shown in FIG. 16, the wiper arm 11 of the upper wiper 10 starts to descend from the uppermost position and exceeds a predetermined position before the overlapping area 19 on the wiping surface (in this example, it exceeds the quarter cycle position in the middle of the lowering). Check point CP2, and the cam portion 25c of the crank disk 25b of the upper wiper 10 exceeds the check point CP2 from the angular position corresponding to the uppermost position of the wiper arm 11 in the rotational direction over 1/4 cycle. The limit switch 47 is disposed at an angular position advanced to an angle corresponding to. When the wiper arm 11 passes the check point CP2 position, the limit switch 47 is operated, and the pulse signal is input to the controller 50 through the circuit 47a.
[0064]
The control method of this embodiment will be described below with reference to FIGS. 17 and 18 with reference to FIG. Note that, in the flowchart of the control method 55 of the wiper drive device 45 shown in FIG. 17, the detailed processing content in step S50 is shown in FIG. 18. In FIG. 19, the movements of the tips P and Q of the lower wipers 10 and 20 driven by the control method 55 are indicated by curves P5 and Q5 on the time axis, respectively. The step numbers S31 to S50 in the flowchart are appended to the corresponding positions. Further, in the following example, it is assumed that the lower wiper 20 reaches the left or right stroke end after the upper wiper 10 reaches the uppermost position.
[0065]
First, in step S31, it is checked whether the wiper switch 58 is ON. If the wiper switch 58 is ON, after the upper wiper 10 is driven in step S32, step S32 is followed until an ON signal (pulse) of the limit switch 47 is input in step S33. Wait repeatedly. Thereafter, when the limit switch 47 is turned on, it is determined that the upper wiper 10 has passed the check point CP2. Next, in step S34, one of the limit switches 32 and 33 is turned on, that is, the lower wiper 20 is moved left and right. Check which stroke end has been reached. If not ON, the upper wiper 10 is stopped in step S35 and an error is displayed to prevent the upper and lower wipers 10, 20 from colliding and being damaged. (Error handling will be described later.)
[0066]
If any one of the limit switches 32 and 33 is ON in step S34, the drive of the upper wiper 10 is continued as it is in step S36. Then, the upper wiper 10 enters the overlapping area 19. Next, it waits repeatedly from step S36 until the ON signal (pulse) of the limit switch 46 is inputted in step S37, and when the limit switch 46 is turned ON, the upper wiper 10 passes the check point CP1 (that is, escapes from the overlapping area 19). ), And then the driving of the lower wiper 20 is started in step S38. Thereafter, in step S39, the process waits until the limit switch 31 is turned on. When the limit switch 31 is turned on, it is determined that one cycle of the upper wiper 10 is completed, and it is checked in step S40 whether the wiper switch 58 is turned on.
[0067]
If it is not ON, after the upper wiper 10 is stopped in step S41, it waits until either one of the left and right limit switches 32, 33 is turned on in step S42, and if it is turned on, it is determined that the lower wiper 20 has completed 1/2 cycle. In step S43, the lower wiper 20 is stopped and the present control process is terminated.
[0068]
When the wiper switch 58 is ON in the above step S40, the upper wiper 10 continues to drive as it is and then moves downward, but then in step S44, has any one of the left and right limit switches 32, 33 turned ON? When it is ON, it is determined that the lower wiper 20 has completed 1/2 cycle. After the lower wiper 20 is stopped in step S45, the process proceeds to step S46. Further, when it is not ON in step S44, the process proceeds to step S46.
[0069]
Next, in step S46, it waits for the limit switch 47 of the upper wiper 10 to be turned on. If not, the process is repeated from step S44, and if it is turned on, it is determined that the check point CP2 has been passed. It is confirmed whether any one of 33 is turned on, that is, whether the lower wiper 20 has reached the left or right stroke end and stopped. When either one of the left and right limit switches 32 and 33 is ON, the process returns to step S36 to continue the lowering of the upper wiper 10 and enter the overlapping area 19, and the above processing is repeated. If both the left and right limit switches 32 and 33 are not ON in step S47, that is, if the lower wiper 20 has reached the stroke end, the upper wiper 10 is temporarily stopped in step S50. Wait for the left and right stroke ends to reach and stop.
[0070]
The details of step S50 will be described with reference to FIG. 18. First, in step S51, the upper wiper 10 is temporarily stopped, then in step S52, the lower wiper 20 is continuously driven, and in step S53, one of the left and right limit switches 32, 33 is selected. Until the stroke end of the lower wiper 20 is reached, and when it is turned on, the lower wiper 20 is stopped in step S54, and then the upper wiper 10 is driven again in step S55 and lowered to enter the overlapping region 19 . Thereafter, the process returns to step S36 and the above-described processing is repeated.
[0071]
When an error display in the above step S35 immediately after the upper wiper 10 starts driving, the wiper switch 58 is turned off and the cause of the abnormality in the lower wiper 20 is removed. The wiper switch 58 is used to switch the lower wiper 20 and the upper wiper 10 together. The so-called return to origin can be performed by stopping each of the left and right stroke ends and the uppermost position after being driven independently. An origin return button switch (not shown) having the same function may be provided.
[0072]
In step S47, when the upper wiper 10 has passed the check point CP2, if the lower wiper 20 has not reached the left or right stroke end and has not stopped, the process proceeds to step S50 (steps S51 to S55). The upper wiper 10 is temporarily stopped and the lower wiper 20 is waited. However, the present invention is not limited to this. For example, an error display may be performed as in step S35.
[0073]
Further, when the waiting time for reaching the left and right stroke ends of the lower wiper 20 in steps S51 to S55 becomes longer than a predetermined time, the upper wiper 10 is temporarily stopped and a time over error is generated, and the error processing in step S35 is performed. Can be processed in the same manner.
Further, in the above example, the lower wiper 20 reaches the left or right stroke end while the upper wiper 10 passes the uppermost position and then descends. However, the present invention is not limited to this. Of course, the lower wiper 20 may reach either the left or right stroke end before reaching the uppermost position of the upper wiper 10.
[0074]
According to the fifth embodiment, as shown in FIG. 19, when one cycle is completed, the upper wiper 10 continues to descend without waiting for the lower wiper 20 to reach the left and right stroke ends, and the wiping surface overlaps. At the check point CP2 approaching the area 19, the lower wiper 20 reaches the stroke end, confirms or waits for the stroke end, and enters the overlapping area 19, so the loss time, that is, waiting for the completion of one cycle of the upper wiper 10 is reached. Control without time is possible. Thereby, the upper wiper 10 can be continuously driven.
[0075]
Further, according to the control method for waiting for the lower wiper 20 to reach and stop the stroke end, even when the lower wiper 20 reaches the stroke end later than usual due to load fluctuations such as mud, Also, it is possible to cope with a configuration in which the speed of the lower wiper 20 is variable.
[0076]
Accordingly, the upper wiper 10 is continuously driven, and the lower wiper 20 can be intermittently driven in units of ½ cycle while the upper wiper 10 is not in the overlapping area 19 of the wiping surface.
[0077]
In the configuration and the control method of the wiper driving device of the first to fifth embodiments, the limit switches 31, 32, 33, 46, and 47 are not limited to this, for example, individually or all, close to each other. A switch, step S51 to S55 potentiometer or other position detector may be used, and the arrangement positions of the limit switches 31, 32, 33, 46, 47 may be arbitrarily set at predetermined positions of the movable parts of the upper and lower wipers 10, 20. You may choose. Further, any or all of the control circuits configured based on the control methods 51, 52, 53, 54, and 55 may be disposed in the controller 50 and selectively used. Furthermore, the driving speeds of the upper and lower wipers 10, 20 may not be equal.
[0078]
As described above, according to the present invention, the following operations and effects can be obtained.
[0079]
(1) Since the upper wiper 10 is configured to be swingable in the vertical direction, the upper wiper 10 is moved only in the vicinity of the lowest position of the vertical swing in both the upper and lower wiper 10 and 20 drive modes. It can be made to have the wiping surface overlap area | region 19 with the wiper 20, and the time when the upper wiper 10 is not in this overlap area | region 19 can be lengthened. Further, by simultaneously driving the lower wiper 20 by making maximum use of the time during which the upper wiper 10 is not in the overlapping area 19, the waiting time between the upper and lower wipers 10, 20 can be greatly reduced. .
[0080]
(2) As a result of the above (1), even if both the upper and lower wipers 10 and 20 are driven, the adhesion of raindrops to the window 8 can be reduced, so the visibility from the window is very good, The operator's fatigue can be reduced in the visual recognition work.
[0081]
(3) Since the upper wiper 10 having the wiper shaft 22 disposed on the side of the window frame 7a swings the wiper arm 11 in the vertical direction, the wiping surface of the upper wiper 10 can be set wide in the vertical direction. As a result, even when the upper wiper 10 alone is driven, a wide wiping surface and a wide field of view can be obtained so that the entire range of movement of the work implement can be viewed. As a result, the operator's fatigue can be reduced in the visual work in the working machine movement range.
[0082]
(4) As a result of (3) above, according to the type of work machine, for example, when the front loader type work machine is installed, only the upper wiper 10 is used as a standard specification. Therefore, the lower wiper 20 can be provided with an additional specification to ensure the performance, and the economical wiper driving devices 41, 42, 43, 44, 45 can be configured.
[0083]
(5) Since the lower wiper 20 is attached to the cab 7 via the bracket 29 that is suspended from the cab 7, the lower wiper 20 can be easily retrofitted as an additional specification. Furthermore, since the shape and length of the bracket 29 are arbitrary, the wiping surface of the lower wiper 20 can be set to the optimum position with respect to the wiping surface of the upper wiper 10.
[0084]
As a result of the above, the wiper surface of one upper wiper is set wide to ensure visibility so that the range of movement of the work machine can be viewed by driving the upper wiper alone, and the other lower wiper ensuring visibility of lower work such as deep groove excavation With both driving, the waiting time of the upper wiper can be shortened and the operator's fatigue can be greatly reduced.
[0085]
In the above, the embodiment has been described by taking the hydraulic excavator as an example. However, the present invention is not limited to the hydraulic excavator but can be applied to other construction machines, and the same operations and effects as described above can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator of an example of an application machine of the present invention.
2 is an E view of FIG. 1. FIG.
FIG. 3 is a detailed view of a part F in FIG. 2;
FIG. 4 is a schematic diagram of the wiper drive device according to the first embodiment of the present invention.
FIG. 5 is a control flowchart of the first embodiment.
FIG. 6 is a time chart showing the movement of the wiper according to the control method of the first embodiment.
FIG. 7 is a schematic diagram of a wiper drive device according to a second embodiment.
FIG. 8 is a control flowchart of the second embodiment.
FIG. 9 is a time chart showing the movement of a wiper according to the control method of the second embodiment.
FIG. 10 is a schematic diagram of a wiper drive device according to a third embodiment.
FIG. 11 is a control flowchart of the third embodiment.
FIG. 12 is a time chart showing the movement of a wiper according to the control method of the third embodiment.
FIG. 13 is a schematic diagram of a wiper drive device according to a fourth embodiment.
FIG. 14 is a control flowchart of the fourth embodiment.
FIG. 15 is a time chart showing the movement of a wiper according to the control method of the fourth embodiment.
FIG. 16 is a schematic diagram of a wiper drive device according to a fifth embodiment.
FIG. 17 is a control flowchart of the fifth embodiment.
18 is a detailed flowchart of a part of the steps in FIG.
FIG. 19 is a time chart showing the movement of a wiper according to the control method of the fifth embodiment.
FIG. 20 is a front view of a wiper device according to the prior art.
FIG. 21 is a schematic view of a wiper driving device according to the prior art.
FIG. 22 is a time chart showing the movement of the wiper of the wiper driving device according to the prior art.
[Explanation of symbols]
7a ... Window frame, 10 ... Upper wiper, 11 ... Wiper arm, 19 ... Overlapping area, 20 ... Lower wiper, 21 ... Wiper arm, 22 ... Wiper shaft, 23 ... Arm, 25b ... Crank disk, 25c ... Cam part, 29 ... Bracket 31 ... Limit switch, 31a ... Signal circuit, 32 ... Limit switch, 32a ... Signal circuit, 33 ... Limit switch, 33a ... Signal circuit, 41 ... Wiper drive device, 42 ... Wiper drive device, 43 ... Wiper drive device, 44 DESCRIPTION OF SYMBOLS ... Wiper drive device, 45 ... Wiper drive device, 46 ... Limit switch, 46a ... Signal circuit, 47 ... Limit switch, 47a ... Signal circuit, 50 ... Controller, 51 ... Control method, 52 ... Control method, 53 ... Control method, 54 ... Control method, 55 ... Control method, 55a ... Control method, 58 ... Wiper switch.

Claims (3)

In a wiper drive control method for a construction machine,
Of the plurality of wipers (10, 20) provided in the window (8) portion of the cab (7), two wipers having an overlapping region (19) in which two adjacent wiping surfaces (10a, 20a) partially overlap ( When any one of the wipers (10) of (10, 20) leaves the overlapping region (19), the other wiper (20) is driven ,
Said one wiper (10), said overlap region (19) continuously driven in the next stroke end is passed through after leaving the drives toward the overlapping area again (19),
The other wiper (20) is configured to leave the overlap region (19) and stop at the next stroke end until the one wiper (10) reaches the overlap region (19) again. A construction machine wiper drive control method characterized by the above. In the construction machine wiper drive control method according to claim 1 ,
When the one wiper (10) approaches a predetermined distance before the overlap area (19), only when the other wiper (20) has left the overlap area (19), the one wiper (10 ) Is continuously driven, a wiper drive control method for a construction machine. In the construction machine wiper drive control method according to claim 2 ,
When the one wiper (10) approaches a predetermined distance before the overlap region (19), if the other wiper (20) does not leave the overlap region (19), one wiper ( 10)
After that, when the other wiper (20) leaves the overlapping region (19), the one wiper (10) is driven again.

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