JP2014020085A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine allowing an ON/OFF operation of an electric switch included in a travel warning device to be performed without causing any wearing of related portions including the electric switch and which can easily adjust a position when mounting the travel warning device.SOLUTION: In an inventive mini-shovel, a travel warning device including warning means 14 for issuing an alarm includes detection members 23, 24 swing in accordance with swinging operation of travelling levers 10, 11 and made of a magnetic material. The detection members 23, 24 are positioned so as to face magnetic detectors of non-contact type switches 25, 26 when travelling levers 10, 11 are neutrally held, and have cutout parts 23a, 24a vertically extended and formed over the magnetic detectors, respectively. The non-contact type switch 25 and the detection member 23 are provided at a prescribed interval oppositely in the axial direction of a swing shaft 15, and also the non-contact type switch 26 and the detection member 24 are provided in the same manner.

Description

  The present invention relates to a work machine such as a hydraulic excavator provided with a travel warning device that issues a warning to call attention during travel.

  There exists a thing shown by patent document 1 as this kind of prior art. This prior art consists of a construction machine, for example, a hydraulic excavator provided with a traveling body, a revolving body disposed on the traveling body, and a working device attached to the revolving body so as to be rotatable in the vertical direction. The hydraulic excavator includes a driver seat disposed on the revolving body, a pair of traveling levers disposed in front of the driver seat and capable of swinging by driving the traveling body, and extending in the left-right direction of the revolving body. And a swing shaft that forms a swing center of each of the travel levers.

  In addition, the hydraulic excavator includes a travel warning device that issues a warning to alert the surroundings of the hydraulic excavator during travel. This travel warning device is an electric switch that detects the swing of the travel lever, that is, a limit switch constituting a contact switch, a transmission means comprising a plurality of members that transmit the swing of the travel lever to the limit switch, and a limit switch Alarm means for issuing an alarm in response to an ON / OFF operation, for example, an ON operation.

JP 2001-11903 A

  Since the above-described prior art has a configuration in which one of a plurality of members forming the transmission means and the limit switch are always in contact with each other, the contact portion may be worn over time. When a contact failure occurs due to wear, the positional relationship between a plurality of members constituting the transmission means and the limit switch are restored so as to restore stable contact between the corresponding member of the transmission means and the limit switch. A complicated adjustment work for readjusting the positional relationship with the corresponding member is required.

  In addition, since the transmission means for transmitting the swing of the travel lever to the limit switch is composed of a plurality of members, each member including the vertical position adjustment of each member constituting the travel alarm device when the travel alarm device is attached. Therefore, it is difficult to expect the improvement of work efficiency when the travel warning device is attached.

  The present invention has been made from the actual situation in the prior art described above, and an object thereof is to perform on / off operation of an electric switch included in the travel warning device without causing wear of related parts including the electric switch. Another object of the present invention is to provide a work machine that can be easily adjusted in position when the travel warning device is attached.

  In order to achieve this object, the present invention provides a vehicle body including a traveling body, a working device attached to the vehicle body, a driver seat disposed on the vehicle body, a front seat of the driver seat, and the traveling body. A travel lever that can swing by operating the body, a swing shaft that extends in the left-right direction of the vehicle body and forms the swing center of the travel lever, and switches according to the swing operation of the travel lever And a base plate on which a control valve is installed, and an electric switch for detecting the swing of the travel lever and an alarm means for issuing an alarm in response to a signal output from the electric switch The electric switch is a non-contact type switch, and the travel alarm device is detected by a magnetic material that swings in response to a swing operation of the travel lever. The detection member is positioned so as to face the magnetic sensing portion of the non-contact switch when the traveling lever is held neutral, and extends in the vertical direction beyond the magnetic sensing portion. The non-contact switch and the detection member are arranged to face each other along the axial direction of the swing shaft at a predetermined interval.

  In the present invention configured as described above, the control body installed on the base plate is switched by the swinging operation of the travel lever so that the travel body travels. At this time, the ON / OFF operation of the non-contact type switch that outputs a signal to the alarm means is performed without the detection member contacting the non-contact type switch by the swing of the detection member in response to the swing of the traveling lever. it can. As described above, the non-contact switch and the detection member are provided at a predetermined interval and do not come into contact with each other during the swinging operation of the travel lever, so that wear does not occur between them. That is, according to the present invention, the on / off operation of the electric switch included in the travel warning device can be performed without causing wear of related parts including the electric switch.

  Further, according to the present invention, when the traveling lever is held neutral, the magnetic sensing part of the non-contact type switch faces the space part of the detection member, so that the non-contact type switch is turned off and an alarm is issued from the alarm means. There is no. When the travel lever is swung from the neutral position, the magnetic material portion other than the space portion of the detection member faces the magnetic sensing portion of the non-contact switch, so that the non-contact switch is turned on and an alarm is issued from the alarm means. . Therefore, when the frequency of work of the work device is higher than the travel of the traveling body, the ratio of keeping the non-contact switch off increases, and the drive system including the travel system, the work device drive system, and the engine drive system Contributes to stable control.

  Further, according to the present invention, the space of the detection member when the travel lever is held in the neutral position is formed to extend in the vertical direction beyond the magnetic sensing portion of the non-contact switch. The magnetic sensing part of the non-contact switch can be made to face the space of the detection member without requiring a highly accurate position adjustment in the vertical direction between the non-contact switch and the detection member. Therefore, when the travel warning device is installed, the position adjustment that makes the non-contact switch properly face the detection member and the position adjustment that sets the interval between the non-contact switch and the detection member to a predetermined interval, that is, the non-contact switch is moved in the horizontal direction. It is only necessary to perform the position adjustment performed with high accuracy. That is, the present invention can easily adjust the position when the travel warning device is attached.

  Further, the present invention is characterized in that, in the above-mentioned invention, the space portion is formed by a cutout portion having a shape having a lower end opened or a hole portion having a shape having a lower end closed.

  Further, the present invention is the above invention, wherein the travel warning device is disposed on the base plate and fastened to the base plate by a fastener, and extends upward from the fastening portion, and the non-contact switch is Including a bracket having an attachment portion to be attached, fixing the fastener to one of the fastening portion and the base plate of the bracket, and providing a hole set to a size larger than the shape of the fastener on the other It is characterized by that.

  In the present invention configured as described above, the movement of the fastener in the hole is allowed by loosening the fastener, and the bracket can be moved in the horizontal direction with respect to the base plate. Therefore, the non-contact type switch attached to the mounting portion of the bracket is moved in the horizontal direction with respect to the detection member held at the normal position, and the non-contact switch faces the detection member with high dimensional accuracy. In addition, the non-contact switch can be easily positioned so that the predetermined distance from the detection member has high dimensional accuracy.

  According to the present invention, in the above invention, the traveling body includes a left traveling motor and a right traveling motor, and the traveling lever is provided in association with one traveling motor of the left traveling motor and the right traveling motor. 1 travel lever and a second travel lever provided in association with the other travel motor, and the detection member is used to swing one of the first travel lever and the second travel lever. A first detection member that swings in response to a second detection member that swings in response to a swing operation of the other travel lever, wherein the first travel lever is provided integrally with the swing shaft, and the travel The alarm device includes a pipe member mounted on the swing shaft and swingable about an axis of the swing shaft, the second travel lever is provided integrally with the pipe member, and the non-contact switch is The first detection member A first non-contact type switch disposed facing the second detection member and a second non-contact type switch disposed to face the second detection member, wherein the bracket holds the first non-contact type switch. 1 bracket and a second bracket for holding the second non-contact switch, and the alarm means is output from the first non-contact switch and a signal output from the second non-contact switch. It is characterized by issuing an alarm in response to a signal.

  In the present invention configured as described above, when the first traveling lever is swung, one of the left traveling motor and the right traveling motor is driven and can travel on one side of the traveling body. . At this time, the first detection member swings through the swing shaft and the first non-contact switch is turned on, and the alarm means issues a warning by this on operation. Further, when the second travel lever is operated to swing, the other travel motor of the left travel motor and the right travel motor is driven, and the other side of the travel body can travel. At this time, the second detection member swings through the pipe member swinging about the axis of the swing shaft, and the second non-contact switch is turned on. For example, if the first travel lever and the second travel lever are simultaneously swung in the same direction, an alarm is issued by the alarm means and the traveling body travels straight.

  Further, the present invention is the above-described invention, wherein the work machine is a mini excavator provided with a revolving body including a floor plate that is included in the vehicle body and disposed on the traveling body and on which the driver's seat is installed. The travel alarm device is fixed to a portion of the swing shaft positioned between the pair of support plates and is different from the pipe member. The travel warning device is fixed to a base plate and supports the swing shaft. Another pipe member, and a shim that is mounted on the swing shaft and fills a gap between the pipe member and the another pipe member, the base plate, the pair of support plates, and the swing shaft; The pipe member included in the travel warning device, the another pipe member, the shim, the first detection member, the second detection member, the first bracket, the second bracket, The first non-contact switch and the second non-contact switch are arranged in a space surrounded by the revolving frame of the revolving structure, the floor plate, and the exterior cover of the revolving structure. It is said.

  The present invention configured as described above is capable of swinging around another axis of the swinging shaft, another pipe member fixed to the swinging shaft that forms the swinging center of the first traveling lever and the second traveling lever. Since the pipe member can be attached to the swing shaft through the shim without a gap, the positioning accuracy of the second detection member provided integrally with the swingable pipe member in the axial direction of the second detection member can be improved. it can. In addition, the present invention can effectively use the space surrounded by the swing frame of the mini excavator, the floor plate, and the outer cover of the swing body as an installation location of the components of the travel alarm device, Since the first non-contact switch and the second non-contact switch of the apparatus, the first detection member and the second detection member are housed, these first and second non-contact switches and the first and second The detection member is not exposed to the outside of the revolving structure, which contributes to ensuring the durability of the travel warning device.

  According to the present invention, the on / off operation of the electric switch included in the travel warning device can be performed without causing wear of related parts including the electric switch. As a result, the present invention eliminates the need for complicated adjustment work for each component of the travel warning device due to the above-described wear after mounting the travel warning device, which may have occurred in the prior art, and realizes a highly reliable work machine. Can be made.

  According to the present invention, the operating lever is in a neutrally held state, and the detection member has a space portion extending in the vertical direction beyond the magnetic sensing portion of the non-contact switch facing the detection member. Therefore, highly accurate position adjustment in the vertical direction between the non-contact switch and the detection member is not required. Thereby, the position adjustment at the time of attachment of a travel warning device can be performed easily, and the efficiency of the attachment work of a travel warning device can be improved compared with the past.

It is a side view showing the important section composition of the mini excavator which is the 1st embodiment of the working machine concerning the present invention. It is a front view of the mini excavator shown in FIG. It is a front view which shows the driving | running | working alarm apparatus with which the mini excavator which concerns on 1st Embodiment is equipped. It is AA sectional drawing of FIG. It is the perspective view seen from the back side of FIG. It is a perspective view which shows the shim with which the driving | running | working alarm apparatus shown in FIG. 3 is equipped. FIG. 4 is a perspective view of a main part viewed from the front side of FIG. 3. It is a principal part back surface figure of FIG. It is a front view which shows the driving | running | working alarm apparatus with which 2nd Embodiment of the working machine which concerns on this invention is equipped. It is BB sectional drawing of FIG. It is the perspective view seen from the front side of FIG. It is a principal part front view of FIG. It is a principal part perspective view which shows the base plate with which the driving | running | working alarm apparatus shown in FIG. 9 is equipped.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a work machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a main configuration of a mini excavator as a first embodiment of a working machine according to the present invention, and FIG. 2 is a front view of the mini excavator shown in FIG.

  As shown in FIGS. 1 and 2, the mini excavator according to the first embodiment includes a traveling body 1 and a revolving body 2 disposed on the traveling body 1. The traveling body 1 and the revolving body 2 constitute a vehicle body. The mini excavator is provided with a working device 3 that is attached to the swing body 2 so as to be pivotable in the vertical direction and that performs excavation work or the like. The working device 3 includes a boom 4 attached to the revolving structure 2, an arm 5 attached to the tip of the boom 4, and a bucket 6 attached to the tip of the arm 5. Each of the boom 4, the arm 5, and the bucket 6 is driven by a boom cylinder, an arm cylinder, and a bucket cylinder (not shown).

  Further, the mini excavator is disposed on the driver's cab 7 on the floor plate 21 of the revolving structure 2 and on both sides of the operation room 7, and operates to operate the above-described working device 3 and revolving structure 2. The levers 8 and 9 are provided in front of the driver's seat 7, and a pair of traveling levers 10 and 11 that can swing by operating the driving of the traveling body 1 are provided. In addition, a canopy 12 that covers the upper side of the driver's seat 7 is provided. The traveling body 1 includes a left traveling motor and a right traveling motor (not shown), and the first traveling lever 10 described above is related to one of the left traveling motor and the right traveling motor, for example, the right traveling motor. The second travel lever 11 is provided in relation to the other travel motor, that is, the left travel motor.

  3 is a front view showing a travel warning device provided in the mini excavator according to the first embodiment, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, FIG. 5 is a perspective view seen from the back side of FIG. FIG. 7 is a perspective view showing a shim provided in the travel warning device shown in FIG. 3, FIG. 7 is a perspective view of a main part viewed from the front side of FIG. 3, and FIG. 8 is a rear view of the main part of FIG.

  As shown in FIGS. 3 to 5 and the like, this mini excavator extends in the left-right direction of the vehicle body, and has a swing shaft 15 that forms the swing center of the first and second travel levers 10 and 11, It has a base plate 20 on which a control valve (not shown) that is switched according to the swinging operation of the second travel levers 10 and 11 is arranged. The swing shaft 15 is supported by a pair of support plates 31 and 32 fixed on the base plate 20 by welding.

  In addition, the mini excavator according to the first embodiment, as will be described later, is an electric switch that detects the swing of the first and second traveling levers 10 and 11, and an on / off output from the electric switch. And a travel warning device including a warning means 14 that issues a warning in response to the signal.

  The electric switch described above is composed of a non-contact switch, and the travel warning device is a detection member made of a magnetic material that swings according to the swing operation of the travel lever, that is, the first and second travel levers 10 and 11. The non-contact switch and the detection member are arranged to face each other along the axial direction of the swing shaft 15 at a predetermined interval.

  The non-contact type switch includes a first non-contact type switch 25 provided in association with the first traveling lever 10 and a second non-contact type switch 26 provided in association with the second traveling lever 11. The detection member is disposed to face the first non-contact switch 25 and faces the first detection member 23 that swings in response to the swing operation of the first travel lever 10 and the second non-contact switch 26. And a second detection member 24 that swings in response to a swing operation of the second travel lever 11.

  As shown in FIGS. 4, 5, and 7, the first detection member 23 is positioned to face the magnetic sensing portion of the first non-contact switch 25 when the first travel lever 10 is held neutral. A space portion, for example, a cutout portion 23a having a shape with an open lower end is provided. This notch portion 23a is formed to extend in the vertical direction so as to exceed the magnetic sensing portion of the first non-contact switch 25 facing when the first traveling lever 10 is held neutral. Similarly, the second detection member 24 also has a space portion, for example, a lower end, that is positioned so as to face the magnetic sensing portion of the second non-contact switch 26 when the second traveling lever 11 is held neutral. The cutout portion 24a has a shape. The notch 24a is also formed to extend in the vertical direction so as to exceed the magnetic sensing part of the second non-contact switch 26 facing when the second traveling lever 11 is held neutral.

  Each of the first and second detection members 23 and 24 described above extends along the vertical direction directly below the swing shaft 15 when the first and second travel levers 10 and 11 are held neutral, for example. Each notch 23a, 24a consists of a plate member formed near the lower end.

  The first travel lever 10 and the first detection member 23 are provided integrally with the swing shaft 15. That is, as shown in FIGS. 3 and 7, the lower end of the first traveling lever 10 and the upper end of the first detection member 23 are fixed to the pipe member 34 fixed to the swing shaft 15 by the bolt 33 by welding. is there. The travel warning device includes a pipe member 36 that is mounted on the swing shaft 15 and can swing about the axis of the swing shaft 15, and the second travel lever 11 and the second detection member 24 are integrated with the pipe member 36. Is provided. That is, as shown in FIG. 3, the lower end of the second travel lever 11 and the upper end of the second detection member 24 are fixed to the pipe member 36 by welding.

  As shown in FIGS. 3, 5, and 7, the travel warning device is disposed on the base plate 20, a fastening portion fastened to the base plate 20 by a fastener, and a non-contact switch extending upward from the fastening portion. A bracket having a mounting portion to be mounted; The bracket includes a first bracket 28 that holds the first non-contact switch 25 and a second bracket 29 that holds the second non-contact switch 26.

  The first bracket 28 includes a fastening portion 28a fastened to the base plate 20 by a fastener 27, and a mounting portion 28b that extends upward from the fastening portion 28a and to which the first non-contact switch 25 is attached. It consists of a letter-shaped plate member. The fastener 27 includes, for example, a nut 27b fixed to the upper surface of the fastening portion 28a of the first bracket 28, and a bolt 27a whose head is positioned below the base plate 20 and screwed into the nut 27b via a washer 27c. It is made up. A plurality of the fasteners 27 are provided.

  Similarly, the second bracket 30 has a fastening portion 30a fastened to the base plate 20 by the fastener 29, and a mounting portion 30b extending upward from the fastening portion 30a and to which the second non-contact switch 26 is attached. It consists of a plate member having an L shape in side view. The fastener 29 includes, for example, a nut 29b fixed to the upper surface of the fastening portion 30a of the second bracket 30, and a bolt 29a whose head is positioned below the base plate 20 and screwed into the nut 29b via a washer 29c. It is made up. A plurality of fasteners 29 are also provided.

  As shown in FIG. 3, the travel warning device is fixed to a portion of the swing shaft 15 located between the pair of support plates 31 and 32, and another pipe member 35 different from the pipe member 36 and the swing shaft. 15 and a shim 37 shown in FIG. 6 that fills a gap between the pipe member 36 and another pipe member 35.

  As shown in FIG. 8, the portion of the base plate 20 to which the first bracket 28 is attached is larger than the diameter dimension of the shaft portion 27 a 1 of the bolt 27 a that forms the fastener 27 that fastens the first bracket 28 to the base plate 20. A hole 38 having a dimension is formed. Similarly, a hole formed in a portion of the base plate 20 to which the second bracket 30 is attached has a size larger than the diameter of the shaft portion 29a1 of the bolt 29a constituting the fastener 29 for fastening the second bracket 30 to the base plate 20. A portion 39 is formed. By forming such holes 29 and 30, each of the first and second brackets 28 and 30 can move in the horizontal direction along the surface of the base plate 20, that is, in the X direction and the Y direction in FIG. ing.

  Further, as shown in FIG. 3, the travel warning device inputs the on / off signals of the first and second non-contact type switches 25 and 26, and outputs the controller 13 and the controller 13 for signal processing. The above-mentioned alarm means 14 that emits an alarm sound in response to an alarm signal is provided.

  As shown in FIGS. 1 to 3, the base plate 20, the pair of support plates 31, 32, the swing shaft 15, pipe members 34, 36, 35, shim 37, the first detection member 23, which are included in the travel warning device, The second detection member 24, the first bracket 28, the second bracket 30, the first non-contact switch 25, the second non-contact switch 26, the swing frame 2a of the swing body 2, the floor plate 21, and the swing body It is disposed in the space 16 surrounded by the two exterior covers 22.

  The mini-excavator according to the first embodiment configured as described above is configured so that the operator sitting on the driver's seat 7 shown in FIGS. 3 is performed, and excavation work or the like by the work device 3 can be performed.

  When the first and second travel levers 10 and 11 are held neutral, the notch portion 23a of the first detection member 23 faces the magnetic sensing portion of the first non-contact switch 25, and the second detection member Since the 24 notches 24a face the magnetic sensing part of the second non-contact switch 26, each of the first and second non-contact switches 25 and 26 is kept off. Therefore, no alarm signal is output from the controller 13 to the alarm means 14, and no alarm is issued by the alarm means 14. When the first and second travel levers 10 and 11 are swung, a control valve installed on the base plate 20 is switched via a link mechanism (not shown), and a right travel motor or a left travel motor (not shown) is switched. Is supplied with pressure oil. Thereby, the traveling right motor or the traveling left motor is driven, and the traveling body 1 travels.

  Further, by the swinging operation of the first and second travel levers 10, 11, the magnetic sensing part of the first non-contact switch 25 faces the magnetic material part other than the notch part 23 a of the first detection member 23. In addition, since the magnetic sensing part of the second non-contact switch 26 faces the magnetic material part other than the notch part 24a of the second detection member 24, the first and second non-contact switches 25, 26 Is turned on. The ON signals of the first and second non-contact switches 25 and 26 are input to the controller 13, and an alarm signal is output to the alarm means 14 by signal processing in the controller 13. Accordingly, an alarm is issued from the alarm means 14. The warning alerts the surroundings that the traveling body 1 is in a traveling state. At this time, the first and second non-contact switches 25 and 26 are turned on without the first and second detection members 23 and 24 contacting the first and second non-contact switches 25 and 26. The The same applies when switching from the on operation to the off operation.

  According to the first embodiment, as described above, the first and second non-contact type switches 25 and 26 of the travel warning device and the first and second detection members 23 and 24 are provided at predetermined intervals. Since the first and second travel levers 10 and 11 are not touched during the swinging operation, no wear occurs between them. That is, in the first embodiment, the on / off operation of the electric switch included in the travel warning device can be performed without causing wear of related parts including the electric switch. As a result, the first embodiment eliminates the need for complicated adjustment work for each component of the travel warning device due to the above-described wear after attachment of the travel warning device that may have occurred, and realizes a highly reliable mini excavator. be able to.

  As described above, when the first and second travel levers 10 and 11 are held neutral, the magnetic sensing portions of the first and second non-contact switches 25 and 26 are connected to the first and second detection members 23 and 26, respectively. Since the 24 notches 23a and 24a are opposed to each other, the first and second non-contact switches 25 and 26 are turned off, and no alarm is issued from the alarm means 14. When the first and second travel levers 10 and 11 are swung from the neutral position, the magnetic material portions other than the cutout portions 23a and 24a of the first and second detection members 23 and 24 are the first and second non-contact types. Since the switches 25 and 26 are opposed to the magnetic sensing portions, the first and second non-contact switches 25 and 26 are turned on, and an alarm is issued from the alarm means 14. Therefore, in the mini excavator, in which the work frequency by the working device 3 is likely to be increased as compared with the traveling of the traveling body 1, the ratio of keeping the first and second non-contact switches 25 and 26 off increases. This contributes to stable control of drive systems including systems, work device drive systems, and engine systems.

  Further, in the first embodiment, the notches 23a and 24a of the first and second detection members 23 and 24 of the travel warning device when the first and second travel levers 10 and 11 are held at the neutral positions are provided in the first embodiment. The first and second non-contact type switches 25 and 26 are formed so as to extend in the vertical direction beyond the magnetic sensing portions of the first and second non-contact type switches 25 and 26. The magnetic sensing parts of the first and second non-contact type switches 25 and 26 are arranged in the first and second directions without requiring a highly accurate position adjustment in the vertical direction between the first and second detection members 24 and 25. The detection members 23 and 24 can be opposed to the notches 23a and 24a. Accordingly, when the travel warning device is attached, the first and second non-contact type switches 25 and 26 are properly opposed to the first and second detection members 23 and 24, and the first and second non-contact type switches. Position adjustment with a predetermined interval between the first and second detection members 23 and 24, that is, only position adjustment performed by moving the first and second non-contact switches 25 and 26 in the horizontal direction. This can be done with high accuracy. Therefore, this 1st Embodiment can perform position adjustment at the time of attachment of a travel warning device easily.

  In the first embodiment, the first and second detection members 23 and 24 are arranged in the vertical direction directly below the swing shaft 15 when the first and second travel levers 10 and 11 are held neutral. The notches 23a and 24a that extend along the side and form the space are formed of plate members formed near the lower end. Therefore, when a sufficient height dimension can be secured immediately below the swing shaft 15 that forms the swing center of the first and second travel levers 10 and 11, that is, between the swing shaft 15 and the base plate 20. Is preferred.

  Further, in this first embodiment, by loosening the fasteners 27, 29 provided in the travel warning device, the movement of the fasteners 27, 29 in the holes 38, 39 shown in FIG. On the other hand, the first and second brackets 28 and 30 can be moved in the X and Y directions shown in FIG. 7, that is, in the horizontal direction. Accordingly, the first and second non-contact types attached to the attachment portions 28b and 30b of the first and second brackets 28 and 30 with respect to the first and second detection members 23 and 24 held at the regular positions. The switches 25 and 26 are moved in the horizontal direction so that the first and second non-contact switches 25 and 26 are opposed to the first and second detection members 23 and 24 with high dimensional accuracy. The first and second non-contact switches 25 and 26 can be easily positioned so that the predetermined distance between the first and second detection members 23 and 24 has high dimensional accuracy.

  In the first embodiment, when the first traveling lever 10 is operated to swing, the right traveling motor is driven, and the crawler belt on one side of the traveling body 1 can be driven to travel. At this time, the first detection member 23 swings through the swing shaft 15 and the first non-contact switch 25 is turned on, and the alarm means 14 issues a warning by this ON operation. Further, when the second traveling lever 11 is swung, the left traveling motor is driven, and the crawler belt on the other side of the traveling body 1 can be driven to travel. At this time, the second detection member 24 swings through the pipe member 36 swinging about the axis of the swing shaft 15 and the second non-contact switch 26 is turned on. Raises an alarm. If the first travel lever 10 and the second travel lever 11 are simultaneously swung in the same direction, an alarm is issued by the alarm means 14 and the traveling body 1 travels straight.

  The first embodiment also includes a pipe member 35 fixed to the swing shaft 15 that forms the swing center of the first travel lever 10 and the second travel lever 11, and a swing around the axis of the swing shaft 15. Since the movable pipe member 36 can be attached to the rocking shaft 15 via the shim 37 without any gap, the positioning of the second detection member 24 provided integrally with the pipe member 36 in the axial direction of the rocking shaft 15 is possible. Accuracy can be increased. In addition, the space 16 surrounded by the swing frame 2a of the mini excavator, the floor plate 21, and the exterior cover 22 of the swing body 2 can be effectively used as an installation location for the components of the travel warning device, and in the sealed space. Since the first non-contact switch 25 and the second non-contact switch 26 and the first detection member 23 and the second detection member 24 of the travel warning device are housed, these first and second non-contact switches 25 are provided. , 26 and the first and second detection members 23, 24 are not exposed to the outside of the revolving structure 2, which contributes to ensuring the durability of the travel warning device.

  9 is a front view showing a travel warning device provided in the second embodiment of the work machine according to the present invention, FIG. 10 is a sectional view taken along line BB in FIG. 9, and FIG. 11 is a perspective view seen from the front side in FIG. 12 is a front view of a main part of FIG. 9, and FIG. 13 is a perspective view of a main part showing a base plate provided in the travel warning device shown in FIG.

  The work machine according to the second embodiment is also a mini excavator having the same appearance as that of the mini excavator shown in FIGS. 1 and 2, for example, but the configuration of the travel warning device is the same as that of the mini excavator according to the first embodiment described above. It is different from the driving warning device. In the following, a description will be given focusing on the different travel warning devices.

  In the travel warning device provided in the mini excavator according to the second embodiment, the first and second detection members 50 and 51 made of a magnetic material are pivoted when the travel levers 10 and 11 are held neutral. 15 has a protruding portion that protrudes toward the front side of the vehicle body, and a space portion, for example, cutout portions 50d and 51d are formed of a plate member formed near the lower end of the protruding portion.

  That is, the first detection member 50 facing the first non-contact switch 25 includes a vertical portion 50a extending in the vertical direction, a horizontal portion 50b extending in the horizontal direction from the lower end of the vertical portion 50a, The horizontal portion 50b is provided with an inclined portion 50c that is inclined downward from the tip of the horizontal portion 50b and has the above-described cutout portion 50d. The protruding portion described above is formed by the horizontal portion 50b and the inclined portion 50c. . Similarly, the second detection member 51 facing the second non-contact switch 26 includes a vertical portion 51a extending in the vertical direction, and a horizontal portion 51b extending in the horizontal direction from the lower end of the vertical portion 51a. The horizontal portion 51b is provided with an inclined portion 51c that is inclined downward from the tip of the horizontal portion 51b and has the above-described cutout portion 51d. The horizontal portion 51b and the inclined portion 51c form the protruding portion described above. Yes.

  Although the cutout portion 50d of the inclined portion 50c of the first detection member 50 is formed in an inclined shape, the magnetism of the first non-contact switch 25 facing the second non-contact switch 25 when the second traveling lever 11 is held neutral. It extends in the up-down direction so as to cross the sensing part. Similarly, the cutout portion 51d of the inclined portion 51c of the second detection member 51 is formed in an inclined shape, but the second non-contact switch that faces when the first traveling lever 10 is held neutral. It extends in the vertical direction so as to exceed the 26 magnetic sensing portions.

  The first detection member 50 and the second detection member 51 are disposed between the pair of support plates 31 and 32. The first detection member 50 is integrally fixed together with the second traveling lever 11 to a pipe member 36 attached to the swing shaft 15 so as to be swingable about the axis of the swing shaft 15. The second detection member 51 is fixed by welding to a pipe member 35 that is fixed to the swing shaft 15 by a bolt 44. Similar to the first embodiment, the first travel lever 10 is fixed to the pipe member 34 fixed to the swing shaft 15 by bolts 33.

  Therefore, when the first travel lever 10 is swung, the second detection member 51 is swung through the pipe member 34, the rocking shaft 15, and the pipe member 35, and the second non-contact switch 26 is turned on. An alarm is issued from the alarm means 14 by an alarm signal output through the controller 15. When the second traveling lever 11 is swung, the first detection member 50 is swung through the pipe member 36, the first non-contact switch 25 is turned on, and an alarm signal output through the controller 15 is output. Thus, an alarm is issued from the alarm means 14.

  The base plate 20 has a protruding portion 20a formed to protrude toward the front side of the vehicle body. As shown in FIG. 13, a plurality of holes 52 and 53 are formed in the protrusion 20a.

  A first bracket 40 to which the first non-contact switch 25 is attached is disposed in the hole portion 52, and a second bracket 42 to which the second non-contact switch 26 is attached in the hole portion 53. Is arranged. The first bracket 40 has a fastening portion 40a fastened to the base plate 20 and a mounting portion 40b extending upward from the fastening portion 40a and to which the first non-contact switch 25 is attached. Similarly, the second bracket 42 has a fastening portion 42a fastened to the base plate 20, and an attachment portion 42b extending upward from the fastening portion 42a and to which the second non-contact switch 26 is attached.

  The first bracket 40 is fixed to the base plate 20 by a fastener 41 including a bolt 41a, a nut 41b, and a washer 41c. The second bracket 42 is a fastener including a bolt 43a, a nut 43b, and a washer 43c. It is fixed to the base plate 20 by 43.

  For example, the nut 41 b of the fastener 41 is fixed to the first bracket 40, and the head of the bolt 41 a that is screwed into the nut 41 b is disposed below the base plate 20. A bolt 41a is inserted into the hole 52 formed in the protruding portion 20a of the base plate 20 described above, and the hole 52 is set to have a shape dimension larger than the diameter dimension of the shaft part of the bolt 41a. Similarly, the nut 43 b of the fastener 43 is fixed to the second bracket 42, and the head of the bolt 43 a that is screwed into the nut 43 b is disposed below the base plate 20. The bolt 43a is inserted into the hole 53 formed in the protruding portion 20a of the base plate 20 described above, and the hole 53 is set to have a larger dimension than the diameter of the shaft portion of the bolt 43a. Other configurations are the same as those of the first embodiment described above.

  Similarly to the first embodiment, the mini excavator according to the second embodiment configured as described above also has the inclined portion 50c of the first detection member 50 when the first and second travel levers 10 and 11 are held neutral. The notch 50d faces the magnetic sensing part of the first non-contact switch 25, and the notch 51d of the inclined part 51c of the second detection member 51 faces the magnetic sensing part of the second non-contact switch 26. Thus, each of the first and second non-contact switches 25 and 26 is kept off. Therefore, no signal is output to the alarm unit 14 via the controller 13, and no alarm is issued from the alarm unit 14.

  Further, the swinging operation of the first travel lever 10 causes the magnetic sensing portion of the second non-contact switch 26 to face the magnetic material portion of the inclined portion 51c other than the notch portion 51d of the second detection member 51. Further, by the swinging operation of the second traveling lever 11, the magnetic sensing portion of the first non-contact switch 25 is opposed to the magnetic material portion of the inclined portion 50c other than the notch portion 50d of the first detection member 50. Therefore, the second and first non-contact type switches 26 and 25 are turned on. The ON signals of these second and first non-contact switches 26 and 25 are input to the controller 13, and an alarm signal is output to the alarm means 14 by signal processing in the controller 13. Accordingly, an alarm is issued from the alarm means 14.

  In the second embodiment as well, the first and second non-contact switches 25 and 26 of the travel warning device and the first and second detection members 50 and 51 are provided at a predetermined interval, as in the first embodiment. Since the first and second travel levers 10 and 11 are not in contact with each other during the swinging operation, no wear occurs between them. Thereby, the same effect as 1st Embodiment is acquired.

  Also, in the second embodiment, as in the first embodiment, the first and second detection members 50 and 51 of the travel warning device when the first and second travel levers 10 and 11 are held in the neutral position are also provided. The notches 50d and 51d of the inclined portions 50c and 51c are formed to extend in the vertical direction beyond the magnetic sensing portions of the first and second non-contact switches 25 and 26. The first and second non-contact switches 25 and 26 and the first and second detection members 24 and 25 are not required to be adjusted with high accuracy in the vertical direction between the first and second detection members 24 and 25. The magnetic sensing parts of the type switches 25 and 26 can be opposed to the notches 50d and 51d of the first and second detection members 50 and 51. Therefore, similarly to the first embodiment, the second embodiment can easily adjust the position when the travel warning device is attached, and the same effect as the first embodiment can be obtained.

  Further, in the second embodiment, similarly to the first embodiment, by loosening the fasteners 41 and 43 provided in the travel warning device, the fasteners 41 and 43 in the holes 52 and 53 shown in FIG. The movement is allowed, and the first and second brackets 40 and 42 can be moved in the horizontal direction with respect to the base plate 20. Accordingly, the first and second non-contact types attached to the attachment portions 40b and 42b of the first and second brackets 40 and 42 with respect to the first and second detection members 50 and 51 held at the regular positions. The switches 25 and 26 are moved in the horizontal direction so that the first and second non-contact switches 25 and 26 face the first and second detection members 50 and 51 with high dimensional accuracy, and The first and second non-contact switches 25 and 26 can be easily positioned so that the predetermined distance between the first and second detection members 50 and 51 has high dimensional accuracy.

  In the second embodiment, when the first travel lever 10 is swung, the second detection member 51 is swung via the swing shaft 15 and the second non-contact switch 26 is turned on. The alarm means 14 issues an alarm by the operation. Further, when the second traveling lever 11 is swung, the first detection member 50 is swung through the pipe member 36 that is swung around the pivot shaft 15 and the first non-contact switch 25 is turned on. The alarm device 14 issues an alarm by this ON device. Therefore, the relationship between the swing operation of the first and second travel levers 10 and 11 and the on / off operation of the first and second non-contact switches 25 and 26 is different from that of the first embodiment. The point that a warning is issued from the warning means 14 in response to the swing operation of the first and second travel levers 10 and 11 is the same as in the first and second embodiments.

  The second embodiment is particularly effective when it is difficult to secure a sufficient height dimension between the swing shaft 15 and the base plate 20, and the height dimension between the swing shaft 15 and the base plate 20 is effective. Is compensated by the formation of the protruding portions of the first and second detection members 50, 51 in the front direction of the vehicle body, that is, the horizontal portions 50b, 51b and the inclined portions 50c, 51c. 50c and 51c can be made to oppose corresponding 1st, 2nd non-contact-type switches 25 and 26, respectively.

  In the first and second embodiments, the space provided in the first and second detection members 23 and 24 is formed by the notches 23a and 24a. In the second embodiment, the first and first 2 The space provided in the detection members 50 and 51 is formed by the notches 50d and 51d, but the present invention is not limited to this configuration. Instead of the notches 23a and 24a, or 50d and 51d, a hole having a shape in which the lower end is closed, that is, a long hole having a large vertical dimension may be provided.

  In the first embodiment, the nuts 27 b and 29 b of the fasteners 27 and 29 for fastening the first and second brackets 28 and 30 are fixed to the first and second brackets 28 and 30, and the fasteners are attached to the base plate 20. The hole portions 38 and 39 into which the shaft portions 27a1 and 29a1 of the bolts 27a and 29a of the 27 and 29 are inserted are formed. On the contrary, the shaft portions 27a1 and 29a1 of the bolts 27a and 29a are formed on the base plate 20. Are formed, holes 27a and 29b are fixed to the back surface of the base plate 20 by welding so as to fit the holes, and bolts 28a and 30a of the first and second brackets 28 and 30 are bolted. You may make it the structure which formed the hole part larger than the diameter of shaft part 27a1, 29a1 of 27a, 29a, respectively. The same applies to the relationship between the first and second brackets 40 and 42, the base plate 20, and the fasteners 41 and 43 of the second embodiment.

1 Running body (car body)
2 Revolving body (car body)
2a Rotating frame 3 Working device 7 Driver's seat 10 First traveling lever 11 Second traveling lever 13 Controller 14 Alarm means 15 Oscillating shaft 16 Space portion 20 Base plate 20a Protruding portion 21 Floor plate 22 Exterior cover 23 First detection member 23a Notch Department (space part)
24 2nd detection member 24a Notch part (space part)
25 First non-contact switch (electric switch)
26 Second non-contact switch (electric switch)
27 Fastener 28 First Bracket 28a Fastening Part 28b Attachment Part 29 Fastener 30 Second Bracket 30a Fastening Part 30b Attachment Part 31 Support Plate 32 Support Plate 34 Pipe Member 35 Pipe Member 36 Pipe Member 37 Shim 38 Hole 39 Hole 40 First bracket 40a Fastening portion 40b Attachment portion 41 Fastener 42 Second bracket 42a Fastening portion 42b Attachment portion 43 Fastener 50 First detection member 50a Vertical portion 50b Horizontal portion 50c Inclined portion 50d Notch portion (space portion)
51 2nd detection member 51a Vertical part 51b Horizontal part 51c Inclination part 51d Notch part (space part)
52 hole 53 hole

Claims (5)

A vehicle body including a traveling body, a working device attached to the vehicle body, a driver seat disposed on the vehicle body, a traveling lever disposed in front of the driver seat and capable of swinging by operating the driving of the traveling body. And a swing shaft that extends in the left-right direction of the vehicle body and forms the swing center of the travel lever, and a base plate on which a control valve that is switched according to the swing operation of the travel lever is installed. ,
In a work machine having a travel warning device including an electric switch that detects the swing of the travel lever and an alarm unit that issues an alarm in response to a signal output from the electrical switch,
The electric switch comprises a non-contact switch,
The travel warning device includes a detection member made of a magnetic material that swings in response to a swing operation of the travel lever,
The detection member is positioned so as to face the magnetic sensing part of the non-contact switch when the traveling lever is neutrally held, and further extends in the vertical direction beyond the magnetic sensing part. Have
A working machine characterized in that the non-contact switch and the detection member are arranged to face each other at a predetermined interval along the axial direction of the swing shaft. The work machine according to claim 1,
2. The working machine according to claim 1, wherein the space portion includes a cutout portion having a shape having a lower end opened or a hole portion having a shape having a lower end closed. The work machine according to claim 2,
The travel warning device includes a bracket that is disposed on the base plate and is fastened to the base plate by a fastener, and a bracket that extends upward from the fastening portion and to which the non-contact switch is attached. The working machine is characterized in that the fastener is fixed to one of the fastening portion and the base plate of the bracket, and a hole having a size larger than the shape of the fastener is provided on the other. The work machine according to claim 3,
The traveling body includes a left traveling motor and a right traveling motor,
The travel lever includes a first travel lever provided in association with one of the left travel motor and the right travel motor, and a second travel lever provided in association with the other travel motor,
The detection member includes a first detection member that swings according to a swing operation of one of the first travel lever and the second travel lever, and a swing operation of the other travel lever. A swinging second detection member,
The first travel lever is provided integrally with the swing shaft,
The travel warning device includes a pipe member attached to the swing shaft and swingable about an axis of the swing shaft, and the second travel lever is provided integrally with the pipe member.
The non-contact switch includes a first non-contact switch disposed to face the first detection member, and a second non-contact switch disposed to face the second detection member,
The bracket comprises a first bracket for holding the first non-contact switch and a second bracket for holding the second non-contact switch,
The work machine is characterized in that the warning means issues a warning in response to a signal output from the first non-contact switch and a signal output from the second non-contact switch. The work machine according to claim 4,
The work machine is comprised of a mini excavator that is included in the vehicle body and disposed on the traveling body, and includes a revolving body having a floor plate on which the driver's seat is installed,
A pair of support plates fixed to the base plate and supporting the swing shaft;
The travel warning device is fixed to a portion of the swing shaft located between the pair of support plates, and is attached to another swing member different from the pipe member, the swing shaft, and the pipe member and the Including a shim that fills a gap with another pipe member,
The base plate, the pair of support plates, the swing shaft, the pipe member included in the travel warning device, the another pipe member, the shim, the first detection member, the second detection member, the first One bracket, the second bracket, the first non-contact switch, and the second non-contact switch are surrounded by a swing frame of the swing body, the floor plate, and an exterior cover of the swing body. A work machine characterized by being arranged in a space.

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