JP4908313B2 - Industrial machine operation device - Google Patents

Description

  The present invention relates to an operating device for an industrial machine in which an operating knob is provided on a grip portion formed on the protruding end side of an operating lever in an industrial machine.

  An industrial machine, for example, a construction machine (construction machine) is used at a civil engineering / architecture work site, and includes a bulldozer, a power shovel, and a crane truck. The driver's seat of such an industrial machine is generally provided with an operation lever that causes the industrial machine or equipment (option) included in the industrial machine to perform a predetermined operation by a swinging operation. A grip portion that can be gripped by an operator is formed on the protruding end side.

  Then, by swinging the operation lever while the operator holds the grip portion, an optional predetermined operation including, for example, traveling control of an industrial machine or a scraper can be performed. Recently, however, it has been proposed that an operation knob that can be operated by an operator is formed on the gripping part. The operator grasps the gripping part while holding the gripping part and swinging the operation lever. The operation knob can be operated by extending the length so that other operations can be performed.

  In such a conventional industrial machine operating device, a tube fuse or an auto fuse is connected to a harness extending from a gripping part to a control mechanism of an industrial machine (such as an ECU in the case of a self-propelled type), and the operation knob electric The overcurrent to the circuit was suppressed. In addition, there is one in which a chip fuse or a resistor is connected to the substrate of the control mechanism to suppress an overcurrent to the electric circuit of the operation knob. In addition, since this prior art does not relate to the literature known invention, there is no prior art document information to be described.

  However, in the conventional industrial machine operating device, since a fuse for suppressing overcurrent to the electric circuit of the operation knob is connected, when the fuse is blown by overcurrent, it is necessary to replace it with a new fuse. The operation with the operation knob becomes impossible. Therefore, there is a problem that the replacement work of the fuse is required, and it is necessary to always prepare a replacement fuse.

  The present invention has been made in view of such circumstances, and when an overcurrent occurs, the circuit current of the electric circuit of the operation knob is limited, and the circuit current limit is automatically released to replace the fuse. An object of the present invention is to provide an industrial machine operating device that can eliminate the need for work or the like.

According to the first aspect of the present invention, there is provided an operating lever which is disposed in an industrial machine and performs a predetermined one operation on the industrial machine or equipment included in the industrial machine by a swinging operation, and a protruding end side of the operating lever A grip portion formed by the operator and capable of swinging the operation lever, an operation knob formed on the grip portion and operable by the operator who grips the grip portion, and the grip portion And an electric circuit board that forms a predetermined electric circuit corresponding to the operation of the operation knob and causes the industrial machine or equipment included in the industrial machine to perform another predetermined operation. In the industrial machine operating device, the electrical circuit on the surface of the electrical circuit board is provided with a tact switch capable of detecting a pressing operation of the operation knob and forming a predetermined electrical circuit, and the back surface of the electrical circuit board. the electrical circuit Limiting circuit current return to the original resistance value by the resistance value limits the increased circuit current the resistance value changes with capable of suppressing an overcurrent is a reversible reduction of the temperature by an increase in temperature due to the overcurrent An overcurrent protection element that can be released is connected.

According to a second aspect of the invention, the industrial machinery operating device according to claim 1 Symbol placement, the operation knob, the formed a plurality of the gripping portions, a plurality of electrical circuits which an electric circuit is formed corresponding to each operation knob In addition to having a substrate, the single overcurrent protection element can suppress overcurrent for each electric circuit formed corresponding to the operation knob.

According to the first aspect of the present invention, the resistance value increases due to the temperature rise due to overcurrent, the circuit current can be limited and the overcurrent can be suppressed, and the resistance value change is made reversible and the temperature decreases. Since the overcurrent protection element that can return to the original resistance value and the restriction of the circuit current can be released is connected to the electric circuit of the electric circuit board, when the overcurrent occurs, the circuit current of the electric circuit of the operation knob is limited. Then, the restriction on the circuit current is automatically released, so that the work of replacing the fuse or the like may be unnecessary.
Furthermore, since the tact switch that can detect the pressing operation of the operation knob and form a predetermined electric circuit is formed on the electric circuit board, it is more effective to suppress overcurrent by the overcurrent protection element. Can do. That is, in an electric circuit that detects operation with a tact switch, a relatively weak current flows and is weak against overcurrent. However, operation with a tact switch is suppressed while suppressing such overcurrent. The operation of the knob can be detected.

According to the invention of claim 2, a plurality of operation knobs are formed on the gripping portion, and each of the operation knobs includes a plurality of electric circuit boards on which electric circuits corresponding to the operation knobs are formed. Since overcurrent can be suppressed for each electric circuit formed corresponding to the operation knob, even if a plurality of operation knobs are formed, only one overcurrent protection element is required, and the number of parts can be increased. It can be avoided. Moreover, since only one comparatively expensive overcurrent protection element is sufficient, it can suppress that manufacturing cost increases.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The industrial machine operating device according to the present embodiment is disposed in an industrial machine (construction machine) such as a bulldozer, a power shovel, or a crane truck used in a civil engineering / architecture work site. As shown in FIG. 2, an operation lever 1 disposed in a driver's seat of the industrial machine, a grip portion 3 disposed on the protruding end side of the operation lever 1, and an operation knob 4 formed on the grip portion 3. 18 is mainly composed.

  The operating lever 1 includes a tubular member 2a that can swing around a swing shaft (not shown) at the base end (lower end side in the figure), and a corrugated tube 2b that is formed to cover the outer periphery of the tubular member 2a. Configured, and when the operator swings back and forth or from side to side, the industrial machine or equipment included in the industrial machine has a predetermined operation (for example, the industrial machine travels or stops, swivels, or It is configured to be able to operate an installed crane or excavator.

  The grip portion 3 is made of, for example, a resin molded product that can accommodate electric circuit boards 5, 12 and the like to be described later, and is configured so that an operator can grip and operate the operation lever 1 to swing. is there. On the front side (the side desired by the operator seated in the driver's seat) and the opposite side (the back side) of the gripping unit 3, an operation that can be operated by extending the finger of the operator holding the gripping unit 3 Knobs 4 and 18 (switch knobs) are formed.

  Of these, the operation knob 4 is a so-called seesaw type switch knob that can be swung left and right by extending the operator's thumb. As shown in FIGS. It is formed in the case C1 while being covered and waterproofed. As shown in FIG. 6, the operation knob 4 is formed with flange portions 4a and 4b on the left and right sides, respectively, and is formed on the case C1 by pressing one of the left and right surfaces of the operation knob 4. When pivoted about the pivot axis L, the flange portion 4a or 4b is configured to selectively press the operation portions Fa and Fb in the case C1.

  The operation portion Fa includes a first operation member 8a, a second operation member 9a, and a coil spring 10a interposed between the first operation member 8a and the second operation member 9a. As shown in FIG. 4, when the operation knob 4 is swung to the left and the flange portion 4a presses the top of the second operation member 9a, the pressing force is transmitted to the first operation member 8a via the coil spring 10a, and the tact The operated portion 7aa in the packing 7a of the switch 6a can be pressed.

  Similarly, the operation portion Fb includes a first operation member 8b, a second operation member 9b, and a coil spring 10b interposed between the first operation member 8b and the second operation member 9b. When the operation knob 4 is swung to the right and the flange portion 4b presses the top of the second operation member 9b, the pressing force is transmitted to the first operation member 8b via the coil spring 10b, and the tact switch 6b is packed. The operated portion 7ba in 7b can be pressed.

  The packings 7a and 7b are made of soft resin or synthetic rubber, and are configured so as to cover the tact switches 6a and 6b and be waterproof, respectively. When the operating portions 7aa and 7ba are pressed by the first operating members 8a and 8b, they are elastically deformed, and the operating portions 6aa and 6ba of the internal tact switches 6a and 6b are pressed to turn on the tact switches 6a and 6b. To get. That is, it can be grasped which of the tact switches 6a and 6b is turned on whether the operation knob 4 is swung to the left or right.

  However, when the pressing operation on the operation knob 4 is stopped and the operator releases his / her finger from the operation knob 4, a spring or the like that is disposed in the tact switches 6a and 6b and returns the operating portions 6aa and 6ba to the original position is restored. The operation knob 4 is returned to the initial position (the state where it is not swung to the left or right) by the urging force by means (not shown) and the restoring force of the elastically deformed packings 7a and 7b.

  When the displacement amount of the flange portion 4a or 4b due to the operation of the operation knob 4 exceeds the displacement limit of the operating portion 6aa or 6ba in the tact switch 6a or 6b, the coil spring 10a or 10b is compressed and the second operation member is compressed. 9a or 9b is close to the first operating member 8a or 8b, and is configured to be able to absorb the amount of displacement exceeding the displacement limit. In addition, instead of the operation portions Fa and Fb, the flange portion 4a or 4b is pressed, and the pressing force is transmitted to the operated portion 7aa of the packing 7a or the operated portion 7ba of the packing 7b to be elastically deformed. It is good also as a single component which can turn on switch 6a or 6b.

  Further, an electric circuit board 5 is disposed in the case C1 formed in the grip portion 3. As shown in FIG. 7, the electric circuit board 5 is printed with wiring K constituting the electric circuit and tact switches 6a and 6b. Control means arranged on the industrial machine main body side. (For example, ECU etc.) and the harness H can be electrically connected. Thus, the electric circuit board 5 forms a predetermined electric circuit corresponding to the swinging operation of the operation knob 4, and performs other predetermined operations (operation lever 1) with respect to the industrial machine or the equipment included in the industrial machine. For example, an operation for changing the direction of the scraper included in the industrial machine).

  Specifically, wiring K and tact switches 6a and 6b are formed on the surface (upper surface) of the electric circuit board 5 to constitute an electric circuit as shown in FIG. That is, it has a wiring L1 extending from a power source composed of a battery or the like mounted on an industrial machine, and wirings L2 and L3 branched from the wiring L1 and connected to tact switches 6a and 6b. When turned on, a predetermined circuit through which current flows through the wirings L1 and L2 is formed. For example, a scraper provided in an industrial machine is turned to the left side, and when the tact switch 6b is turned on, a predetermined circuit through which current flows through the wirings L1 and L3. For example, the scraper is directed to the right side.

  Here, in the present embodiment, the overcurrent protection element 11 is formed on the back surface (lower surface) of the electric circuit board 5, and the overcurrent protection element 11 is connected to the wiring L1 constituting the electric circuit (however, The overcurrent protection element 11 is connected in series to the predetermined circuit). The overcurrent protection element 11 refers to a device composed of a so-called polyswitch (polymer PTC thermistor), and the resistance value increases due to a temperature rise due to overcurrent, and the circuit current can be limited to suppress the overcurrent. At the same time, the resistance value change is made reversible, and the original resistance value is returned to the original resistance value due to the decrease in temperature, so that the restriction of the circuit current can be released.

  That is, the overcurrent protection element 11 is an overcurrent / heating protection element that, when heated by overcurrent or heating, increases the temperature inside the element, increases the resistance value, and slightly limits the circuit current. Since this resistance change value is reversible, when the power supply is turned off, the element temperature decreases, the circuit returns to the original resistance value, the circuit current flows, and self-recovery. In contrast, the replacement is unnecessary.

  As described above, by connecting the overcurrent protection element 11 to the electric circuit of the electric circuit board 5, when an overcurrent occurs, the circuit current of the electric circuit of the operation knob 4 is limited and the circuit current is automatically reduced. The restriction is released (self-recovery), so that it is not necessary to replace the fuse. The electrical circuit board 5 is provided with tact switches 6a and 6b that can detect a pressing operation of the operation knob 4 (a swinging operation by pressing) to form a predetermined electric circuit. It is possible to make the suppression of overcurrent more effective. That is, in the electric circuit that detects the operation by the tact switches 6a and 6b, a relatively weak current flows and becomes weak against the overcurrent, but the tact is suppressed while suppressing the overcurrent. The operation of the operation knob 4 can be detected by the switches 6a and 6b.

  On the other hand, as shown in FIG. 3, the operation knob 18 is a so-called push-type switch knob that can be pressed by extending the index finger or middle finger of the operator. It is formed in the case C2 while being covered with the boot B2 and being waterproofed. Further, as shown in FIG. 9, the operation knob 18 is formed with a flange portion 18a. When the surface of the operation knob 18 is pressed, the operation knob 18 is immersed in the case C, and the operation in the case C2 is performed. It is comprised so that the part Fc may be pressed.

  The operation unit Fc includes a first operation member 15, a second operation member 16, and a coil spring 17 interposed between the first operation member 15 and the second operation member 16. FIG. As shown in FIG. 2, when the operation knob 18 is inserted and the flange portion 18a presses the top of the second operation member 16, the pressing force is transmitted to the first operation member 15 via the coil spring 17, and the tact switch 13 The operated portion 14a in the packing 14 can be pressed.

  The packing 14 is made of soft resin, synthetic rubber, or the like, and is configured to cover the tact switch 13 so as to be waterproof. As described above, the operated portion 14a formed at the center of the top is the first operation. When pressed by the member 15, it is elastically deformed, and the tact switch 13 can be turned on by pressing the operating portion 13 a of the internal tact switch 13. That is, whether or not the operation knob 18 has been pressed can be grasped by turning on the tact switch 13.

  However, when the pressing operation on the operation knob 18 is stopped and the operator removes his / her finger from the operation knob 18, a restoring means (not shown) such as a spring that is disposed in the tact switch 13 and returns the operating portion 13 a to its original position. ) And the restoring force of the elastically deformed packing 14 return the operation knob 18 to the initial position (a state where the operation knob 18 protrudes from the case C2 and can be pressed).

  When the displacement amount of the flange portion 18a by the operation of the operation knob 18 exceeds the displacement limit of the operating portion 13a in the tact switch 13, the coil spring 17 is compressed and the second operation member 16 becomes the first operation member 15. It is configured to be able to absorb the amount of displacement that is close and exceeds the displacement limit. In addition, instead of the operation portion Fc, as a single component member that is pressed by the flange portion 18a, elastically deforms by transmitting the pressing force to the operated portion 14a of the packing 14, and can turn on the tact switch 13. Also good.

  Further, an electric circuit board 12 is disposed in the case C2 formed in the grip portion 3. Similar to the electric circuit board 5 in the case C1, the electric circuit board 12 is printed with wiring constituting the electric circuit and provided with a tact switch 13, and is disposed on the industrial machine main body side. It can be electrically connected to the means (for example, ECU) via the harness H. Thus, the electric circuit board 12 forms a predetermined electric circuit in response to the pressing operation of the operation knob 18, and performs other predetermined operations (the operation lever 1 and the operation lever 1 and the equipment included in the industrial machine). This is different from the operation by operating the operation knob 4, and is configured to allow, for example, shifting during traveling of an industrial machine.

  Specifically, as shown in FIG. 11, the electric circuit board 12 is provided with a wiring L4 branched from the wiring L3 formed on the electric circuit board 5 in the case C1, and the tact switch 13 is turned on. Then, a predetermined circuit flowing through the wirings L1 and L4 is formed, and, for example, a transmission provided in the industrial machine can be controlled to shift up or down. Thus, the overcurrent protection element 11 is connected in series to the predetermined circuit formed when the tact switch 13 is turned on. Like the electric circuit of the electric circuit board 5, the overcurrent protection element 11 is connected to the predetermined circuit. When the resistance value increases, the circuit current can be limited to suppress the overcurrent, and the change in the resistance value can be made reversible so that the original resistance value can be returned to the original resistance value due to the decrease in temperature so that the circuit current limitation can be released. It has become.

  According to the present embodiment, a plurality of operation knobs (two operation knobs 4 and 18) are formed in the grip portion 3, and a plurality of electric circuit boards (electric circuits corresponding to the operation knobs 4 and 18 are formed) ( 5 and 12), and a single overcurrent protection element 11 can suppress overcurrent for each of the electric circuits formed corresponding to the operation knobs 4 and 18, respectively. Even if it is formed, only one overcurrent protection element 11 is sufficient, and an increase in the number of parts can be avoided. Moreover, since one comparatively expensive overcurrent protection element 11 is sufficient, it can suppress that manufacturing cost increases.

  Although the present embodiment has been described above, the present invention is not limited to this. For example, the present invention may be applied to one in which one operation knob is formed on the grip portion of the operation lever or three or more formed. . In the case where a plurality of operation knobs are formed on the grip portion, in this embodiment, the overcurrent of each electric circuit is suppressed by the single overcurrent protection element 11, but each electric circuit has an overcurrent. The protection element 11 may be formed.

  The form of the operation knob is not limited to the seesaw type or the push type as in this embodiment, and may be applied to a switch knob of a slide type, for example. Furthermore, the operation performed based on the swing operation by the operation lever and the operation by the operation knob is not limited to the operation as in the present embodiment, and may be other operations as long as it is an operation of an industrial machine or an equipment included in the industrial machine. There may be. The industrial machine can be applied to various machines such as a bulldozer, a scrape dozer, a hydraulic excavator (backhoe, power excavator, etc.), a truck with a crane device, and the like.

The electrical circuit on the surface of the electrical circuit board is provided with a tact switch that can detect a pressing operation of the operation knob and form a predetermined electrical circuit. The electrical circuit on the back surface of the electrical circuit board has a temperature due to overcurrent. As the resistance value increases, the resistance value increases and the circuit current can be limited to suppress overcurrent, and the change in resistance value can be made reversible, and the temperature resistance can be restored to the original resistance value and the circuit current limitation can be released. As long as it is an industrial machine operating device to which an overcurrent protection element is connected, it can also be applied to devices with different external shapes or with other functions added.

The front view which shows the operating lever in the operating device for industrial machines which concerns on embodiment of this invention Side view showing the gripping part of the operating device for the industrial machine Longitudinal sectional view of gripping part in operating device for the same industrial machine Front view showing an operation knob and its switch in the operating device for the same industrial machine Side view showing an operation knob and its switch in the operating device for the same industrial machine Sectional view taken along line VI-VI in FIG. A top view, a side view and a bottom view showing an electric circuit board in the operating device for the industrial machine Sectional drawing which shows operation | movement of the operation knob in the operating device for industrial machines Sectional drawing which shows the other operation knob in the operating device for industrial machines Sectional drawing which shows operation | movement of other operation knobs The circuit diagram which shows the electric circuit formed in the electric circuit board in the operating device for industrial machines

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation lever 2 Shaft member 3 Grasp part 4 Operation knob 5 Electric circuit board 6a, 6b Tactile switch 7a, 7b Packing 8a, 8b 1st operation member 9a, 9b 2nd operation member 10a, 10b Coil spring 11 Overcurrent protection element 12 Electric circuit board 13 Tact switch 14 Packing 15 First operation member 16 Second operation member 17 Coil spring 18 Operation knob

Claims (2)

An operation lever disposed on the industrial machine and configured to perform a predetermined operation on the industrial machine or the equipment included in the industrial machine by a swing operation;
A grip portion formed on the protruding end side of the operation lever and gripped by an operator to swing the operation lever;
An operation knob formed on the grip portion and operable by an operator who grips the grip portion;
An electric circuit that is disposed in the gripping part, forms a predetermined electric circuit corresponding to the operation of the operation knob, and performs a predetermined other operation on the industrial machine or equipment included in the industrial machine. A substrate,
In an industrial machine operating device comprising:
A tact switch capable of detecting a pressing operation of the operation knob and forming a predetermined electric circuit is formed on the electric circuit on the surface of the electric circuit board, and an electric current on the back surface of the electric circuit board includes an overcurrent. The resistance value increases due to the temperature rise due to this, and the circuit current can be limited to suppress the overcurrent, and the change in resistance value is made reversible. An operating device for an industrial machine, characterized in that an overcurrent protection element that can be operated is connected. The operation knob includes a plurality of electric circuit boards formed on the grip portion and formed with an electric circuit corresponding to each operation knob, and corresponds to the operation knob by a single overcurrent protection element. claim 1 Symbol placement of industrial machinery operating device, characterized in that each capable of suppressing the overcurrent to each electrical circuit formed Te.

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