JP5844452B2 - Pantograph control device for trolley truck - Google Patents

Description

  The present invention relates to a pantograph control device for a trolley-type truck used for ore transportation in a large-scale mine, and more particularly, a trolley mode that travels with electric power obtained from an overhead line and an engine without obtaining electric power from the overhead line. This is suitable for a trolley type dump truck that travels in combination with a non-trolley mode that travels with electric power obtained by driving a generator.

  As this kind of trolley type truck, there is one disclosed in JP-A-63-35102 (Patent Document 1).

  In the above-mentioned Patent Document 1, a dump truck used for ore transportation in a large-scale mine is described. In a non-trolley mode, a dump truck is driven by a generator driven by an engine. It is described that current is collected from a double-wire overhead line and travels by external power. In addition, this patent document describes an invention in which the pantograph is urgently lowered when the pantograph deviates from the overhead line.

JP 63-35102 A

  A trolley type truck as described in Patent Document 1 has a trolley mode that travels with electric power obtained from an overhead line where an overhead line (trolley line) for supplying electric power is laid, and a generator is driven by an engine. The vehicle travels in combination with the non-trolley mode that travels with the electric power obtained. Since the road surface where the trolley line is laid is usually well leveled and smooth, the truck does not move up and down violently, sway left and right, or vibrate vigorously.

  However, the road surface where no overhead wire is laid is often not sufficiently leveled, and there are many cases where unevenness and stones are scattered. For this reason, the truck shakes greatly or vibrates violently. However, in the past, sufficient consideration has not been given to the influence on the pantograph installed in the truck against such a large shake or intense vibration. Therefore, when an excessive load is applied to the pantograph for a long time, there is a concern that the pantograph may be deformed and failed or damaged.

  An object of the present invention is to provide a trolley type that can control and protect a pantograph so that the pantograph mounted on a truck that travels using both a trolley mode and a non-trolley mode is deformed and fails or is damaged. The object is to obtain a pantograph control device for a truck.

In order to achieve the above object, the present invention includes a pantograph mounted on an upper portion of a truck and a control device that controls the pantograph, and trolley mode that travels with power obtained from the overhead line, and does not obtain power from the overhead line. In a pantograph control device for a trolley type truck that travels in combination with a non-trolley mode that travels in a trolley, the pantograph has a frame, a lower frame that is swingably attached to the frame, and a rocker that swings on the lower frame An upper frame attached freely, a current collector boat supported by the upper frame, and a key device for fixing the upper frame to the underframe in a folded state of the pantograph, the control device includes a pantograph When the lowering command is input, control is performed to lower the pantograph, and after the pantograph is stored, the key device is controlled to fix the pantograph. And, wherein the pantograph comprises a pantograph drive source for raising and lowering the pantograph, and a key driving source for driving said key device, said control device, for capturing a calculation unit, a control signal to the computing section Control signal input unit and a control signal output unit that outputs a control signal from the calculation unit, and when the pantograph lowering command is input to the control signal input unit, the calculation unit lowers the pantograph A control signal for controlling the pantograph drive source and a control signal for controlling the key drive source so as to fix the pantograph after storing the pantograph from the control signal output unit. A fixing member for fixing the pantograph is provided on the front end side of the upper frame, and a key driving source for driving the key device is a hydraulic cylinder for the key. The pantograph fixing fixing member is pressed and fixed by the key hydraulic cylinder, and the key device holds a key portion for pressing the fixing member, and the key portion is rotatably held. And a supporting member for rotating the key portion by the hydraulic cylinder for the key to press the fixing member, and to receive the key member on the frame to receive the fixing member pressed by the key device. When the frame structure composed of the lower frame and the upper frame is folded, the fixing member is seated on the key holder and pressed by the key device to be fixed to the frame. And

The present invention is Ru preferably der in mining dump truck to be used such as ores transported mines.

Further, it is preferable that a pantograph storage detection unit for detecting a storage state of the pantograph is provided, and the key device includes a key part opening / closing detection unit for detecting an opening / closing state of the key part.
When the engine start signal is input, when the pantograph is in the retracted state, the control device presses and fixes the pantograph fixing member with the key hydraulic cylinder to maintain a complete locked state. It is good to control to do. By controlling in this way, the pantograph can be automatically and reliably fixed when traveling in the non-trolley mode.

  The control device controls to raise the pantograph when a pantograph ascent command signal is input, and to lower the pantograph when current cannot be collected from the trolley line even when the pantograph has been raised. It is good to control. By controlling in this way, it is possible to prevent the pantograph from traveling while there is no trolley line. In addition, it is possible to know that the pantograph is abnormal where there is a trolley line.

  In addition, when the frame structure comprised by the said lower frame and the upper frame is the state folded, it is further better to provide the said frame with the roll prevention means for preventing the roll of the said frame structure.

  According to the pantograph control device for a trolley type truck of the present invention, in a trolley type truck that runs using both the trolley mode and the non-trolley mode, the pantograph mounted on the truck is deformed and breaks down or is damaged. The pantograph can be controlled and protected to ensure prevention.

BRIEF DESCRIPTION OF THE DRAWINGS The whole structure schematic of the trolley type truck applied to Example 1 of this invention. The whole perspective view of the pantograph mounted on the trolley type truck shown in FIG. FIG. 3 is a schematic front view of the pantograph shown in FIG. 2 in a state where the pantograph is erected. FIG. 3 is a schematic front view of the pantograph shown in FIG. 2 in a state where the pantograph is folded. FIG. 3 is an enlarged detail view of a portion of the pantograph key device shown in FIG. 2, (a) is a front view showing the lock device in a locked state, and (b) is a view showing the lock device in an unlocked state, and only the vicinity of the key portion is shown The partial front view which shows. The control block diagram which shows Example 1 of the pantograph control apparatus of the trolley-type truck of this invention. FIG. 3 is a flowchart for explaining the control operation of the first embodiment of the pantograph control device for a trolley type truck according to the present invention, and is a diagram for explaining a flow during pantograph ascent control. FIG. 3 is a flowchart for explaining the control operation of the first embodiment of the pantograph control device for a trolley type truck according to the present invention, and is a diagram for explaining a flow during pantograph lowering control.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. In addition, the part which attached | subjected the same code | symbol in each figure has shown the same part.

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram of the overall configuration of a trolley type truck applied to Embodiment 1 of the present invention. In this embodiment, a trolley type dump truck used for ore transportation in a large-scale mine will be described as an example.

  In FIG. 1, 1 is an overhead line (trolley line) stretched on the track of the mine, 2 is a trolley type dump truck, and this dump truck 2 is an trolley mode that runs on the electric power obtained from the overhead line 1 and an engine. This is an electrically driven dump truck that travels in combination with a non-trolley mode that travels with electric power obtained by driving a generator. In this embodiment, the trolley mode and the non-trolley mode are always used separately, and particularly when climbing, the climbing speed can be improved by traveling in the trolley mode using the electric power obtained from the overhead line 1. ing. In addition, when the dump truck is used in an environment that requires a large amount of power such as a steep slope, it can be configured to run using the power obtained from the overhead line 1 and the power obtained from the engine at the same time. It is. When the engine (usually a diesel engine) is used to drive a generator, the electricity obtained by the generator is controlled by a control device such as an inverter, and then an alternating current (AC) motor (induction motor). An AC drive system is employed in which the vehicle is driven to travel.

  By adopting an IGBT (Insulated Gate Bipolar Transistor) inverter, it becomes possible to exert a stronger electric brake force.

  A pantograph 4 is mounted on the dump truck 2. That is, a pantograph mounting base 3 is installed at the front part of the dump truck 2, and a pantograph 4 for collecting power from the overhead line 1 is installed at the upper part of the base 3 (the front upper part of the cab 2a). Yes. Reference numeral 5 denotes a current collecting boat at the top of the pantograph, which slides in contact with the overhead wire 1 and collects electricity from the overhead wire 1.

FIG. 2 is a perspective view showing the entire structure of the pantograph 4 shown in FIG. 1, and the configuration of the pantograph in this embodiment will be described with reference to FIG.
In FIG. 2, 6 is a frame of a pantograph attached to the upper part of the pantograph mounting base 3 shown in FIG. A swing support shaft 7 is provided on the upper surface of the underframe 6 in the width direction (lateral direction) of the truck (vehicle). The swing support shaft 7 is formed of a cylindrical member, and is provided so as to be swingable by being inserted into a support shaft (not shown) fixed to the frame 6. A base end portion of the lower frame 8 is fixed to an intermediate portion of the swing support shaft 7 and is configured to be swingable together with the swing support shaft 7.

  Therefore, the lower frame 8 undulates around the swing support shaft 7. A connecting shaft 9 is provided at the distal end (upper end) of the lower frame 8 in parallel with the swing support shaft 7, and a base end portion 11 of the upper frame 10 is swingably connected to the connecting shaft 9. ing.

  The current collecting boat 5 is swingably supported at the front end (upper end) of the upper frame 10 via a boat support 22 or the like. A spring 12 is provided between the swing support shaft 7 and the frame 6. This spring 12 raises the pantograph from the state in which the pantograph shown in FIG. 4 is folded to the state shown in FIGS. 2 and 3 in the frame constituted by the lower frame 8 and the upper frame 10 together with the hydraulic cylinder 20. The driving force in the direction to be applied is applied.

  When the truck is running, the current collecting boat 5 changes the crossing angle between the lower frame 8 and the upper frame 10 according to the change in the distance between the frame 6 and the overhead line 1 of the pantograph, Go up and down with respect to 6. Even in this case, the posture of the current collecting boat 5 is fixed, and the sliding state between the sliding plate 13 disposed on the upper surface of the current collecting boat 5 and the overhead wire 1 is properly maintained. For this reason, a link mechanism is provided at the connecting portion between the distal end portion of the lower frame 8 and the base end portion 11 of the upper frame 10 and the connecting portion between the distal end portion of the upper frame 10 and the current collector boat 5. Thus, regardless of the undulations of the lower frame 8 and the upper frame 10, the posture of the current collecting boat 5 is prevented from changing.

  That is, a counter arm 11a is integrally provided at the base end portion 11 of the upper frame 10 so as to protrude downward, and the counter arm 11a is swung around the connecting shaft 9 together with the upper frame 10. It is composed. Further, an upper balancing shaft 14 is provided at the tip of the balancing arm 11a in parallel with the connecting shaft 9, and the tip (upper end) of the lower balancing rod 15 is swung on the upper balancing shaft 14. It is attached freely. A base end portion (lower end portion) of the balancing rod 15 is swingably attached to the upper surface of the underframe 6 via a lower balancing shaft 16.

Further, a balancing arm (not shown) is also provided on the lower surface of the current collecting boat 5, and one end of an upper balancing rod 17 is swingably attached to the balancing arm. The other end of the rod 17 is swingably attached around the connecting shaft 9 near the tip of the lower frame 8.
With this configuration, the posture of the current collecting boat 5 is not changed regardless of the undulations of the lower frame 8 and the upper frame 10.

  In the present embodiment, as shown in FIG. 2, four springs 12 are provided in the axial direction of the swing support shaft 7, and one end of each spring 12 is fixed to the swing support shaft 7. Each is linked to a link arm 18. The other end of each spring 12 is configured such that two springs are connected to the same swinging member 19 and the four springs 12 are expanded and contracted by two main hydraulic cylinders 20 provided on the left and right. . The base end side of the swing member 19 is swingably attached to the underframe 6. The base end side of the main hydraulic cylinder 20 is also swingably attached to the frame 6. With this configuration, the main hydraulic cylinder 20 is expanded and contracted to erect the frame of the pantograph 4 and raise the current collector boat 5 so as to contact the overhead wire 1, or by folding the frame and collecting the current collector The boat 5 can be lowered and stored. Further, the current collecting boat 5 is pressed against the overhead wire 1 with a constant force through the lower frame 8 and the upper frame 10 by the spring force of the spring 12. At the same time, the current collector boat 5 can be moved up and down by following the relatively large amplitude change of the overhead wire 1 by these configurations.

  Reference numeral 21 shown in FIG. 2 is a boat receiver, and is configured such that when the pantograph 4 is folded, the lower surface of the current collecting boat 5 is supported by the boat receiver 21. Further, the boat support 22 described above is rotatably supported at the top end of the upper frame 10 and the balancing rod 17, and the current collecting boat 5 is attached to the front end portion of the upper frame 10 via the boat support 22. Has been supported.

  2 to 4, 23 is a key device, 24 is a key holder, and 25 is parallel to the current collecting boat 5 via a bracket 26 on the tip side of the upper frame 10 (below the current collecting boat 5). It is a pipe (fixing member) for fixing the attached pantograph. The pipe 25 is seated on the key holder 24 when the pantograph is folded (when stored) and is firmly pressed by the key device 23 (see FIG. 4). Thereby, even if the truck vibrates violently or shakes greatly during traveling in the non-trolley mode, the frame structure (such as the lower frame 8 and the upper frame 10) of the pantograph 4 can be prevented from being deformed or damaged by vibration. It is configured as follows.

  Further, 27 shown in FIGS. 2 to 4 is a frame guide (means for preventing the frame from rolling), and the frame of the pantograph 4 rolls due to intense vibration or large shaking while traveling in the non-trolley mode in which the pantograph 4 is folded. Or to vibrate vigorously in the left-right direction (see FIG. 4).

  Next, the structure of the parts of the key device 23 and the key receiver 24 shown in FIGS. 2 to 4 will be described in detail with reference to FIG. 5, (a) is a front view showing that the key device is in a locked state, and (b) is a view showing that the key device is in an unlocked state, and is a partial front view showing only the vicinity of the key portion.

  The key device 23 includes a key portion 23a for pressing the pipe 25 provided in the frame of the pantograph 4, a support member 23b for rotatably mounting the key portion 23a, and a key for rotating the key portion 23a. It is composed of a key hydraulic cylinder 23c and the like. Reference numeral 23d denotes a bracket fixedly attached to the side surface of the pantograph frame 6 and rotatably attached to the proximal end side of the key hydraulic cylinder 23c. Reference numeral 23e denotes a key limit switch (key part opening / closing detection means) for detecting the open / closed state of the key part 23a, and the base end side of the limit switch 23e is rotated to a support base 23f fixed to the support member 23b. It is attached freely. When the hook portion 23a is in the locked state as shown in FIG. 5A, it can be detected that the limit switch 23e is in the horizontal position and is in the locked state. Further, as shown in FIG. 5B, when the lock is released and the key portion 23a rotates to the right side, the limit switch 23e is pushed on the back surface of the key portion 23a, and the limit switch 23e also rotates to the right side. In addition, it is possible to detect that the key portion 23a is unlocked.

The hook receiver 24 is for seating the pipe (fixing member) 25 attached to the upper part of the frame of the pantograph 4 (the front end side of the upper frame 10) as shown in FIGS. 5 (a) and 5 (b). is there. The key receiver 24 has a V-shaped receiving portion 24a so that the pipe 25 can be strongly received in the vertical direction and the front-rear direction of the vehicle (truck). It is fixed by welding or the like to a base portion 24b which is bolted to the upper surface of the base frame 6. Further, a rubber plate (elastic material) 24c is installed on the receiving side of the pipe of the receiving portion 24a, and the pipe 25 attached to the front end side of the upper frame 10 is attached to the rubber plate 24c by the hook portion 23a. There are functions to prevent misalignment, impact, and damage when fixed.
In this embodiment, the support member 23b of the key portion 23a is also integrally fixed to the base portion 23b of the key receiver 24, and is bolted to the upper surface of the base frame 6 together with the base portion 23b.

  As shown in FIG. 5, in the present embodiment, the pipe 25 attached to the tip of the upper frame 10 of the pantograph 4 is firmly and constantly fixed by the hydraulic pressure of the hydraulic cylinder 23c by the key device 23 and the key receiver 24. Since it is configured to hold down, the pipe 25 pressed against the key holder 24 does not rattle against severe vibration or shaking, and play (gap) does not increase due to rattling. Always firmly fixed. As a result, since the pantograph can be firmly fixed to the frame 6, it is possible to reliably prevent the frame assembly from vibrating in the vertical direction and to suppress the vibration in the horizontal direction by the pressing force of the key device.

Further, if the frame guide 27 is also used, the vicinity of the substantially central portion of the lower frame 8 and the upper frame 10 can be held so as not to be swayed from side to side.
Therefore, according to the present embodiment, even when the truck 2 travels on a rough road surface in the non-trolley mode, the pantograph 4 is reliably prevented from being vigorously vibrated, greatly shaken, damaged or deformed. can do.

  In the present embodiment described above, the pressing force of the hook portion 23a is performed by the hydraulic cylinder 23c, but it can be pressed down to some extent by using a strong spring or air cylinder instead. However, since springs and air are used to press down using elastic deformation, extremely large springs and air cylinders are required to hold down the pantograph so that it does not shift even if large vibrations or shaking occur. Since it is expensive and large, it is difficult to adopt as a pantograph for a truck.

  On the other hand, since the hydraulic cylinder uses oil, it does not contract like air even if strong pressure is applied, and a load caused by large vibration or shaking acts on the pipe 25. However, the pressure can be constantly applied so that the pipe 25 is always held stably by the receiving portion 24a without rattling. In addition, hydraulic cylinders can provide a large force even with a small size, and dump trucks for mines often have a hydraulic power source in the truck itself, and the hydraulic power source can be used, so it can be manufactured very cheaply. It becomes possible.

  In the first embodiment, although not shown, there is also provided a pantograph storage limit switch for detecting that the pantograph 4 has been lowered and stored and that the pantograph has been raised. This limit switch is attached to the key holder 24, for example, and is configured to be turned ON / OFF depending on the position of the fixing member (pipe) 25.

  Next, the pantograph control device in the present embodiment will be described with reference to FIGS. FIG. 6 is a control block diagram showing the pantograph control device, FIGS. 7 and 8 are flowcharts for explaining the control operation of the pantograph control device, FIG. 7 is a diagram for explaining the flow during the pantograph ascending control, and FIG. It is a figure explaining the flow at the time of descent | fall control.

  In FIG. 6, reference numeral 30 denotes a control circuit unit of the pantograph 4. This pantograph control circuit unit 30 sends a pressure oil to the main cylinder 20 so as to raise the pantograph and operates the solenoid 30a. A solenoid 30b for sending pressure oil to the key hydraulic cylinder 23c to be operated so as to close the key part 23a, and a pressure oil to the key hydraulic cylinder 23c to open the key part 23a of the key device 23 Solenoid 30c for operation, ON when the pantograph 4 is stored, ON when the pantograph storage limit switch 30d is turned OFF when the pantograph is raised, OFF when the key part 23a of the key device 23 is closed, the key A limit switch 23e that is turned on when the unit is opened is provided.

  Reference numeral 31 denotes a dump truck driver's seat operation unit. The driver's seat operation unit 31 includes a dump truck engine start switch 31a, a pantograph ascending command switch 31b, a pantograph descending command switch 31c, and the like. Is operated by an operator.

  Reference numeral 32 denotes a pantograph main circuit unit. The main circuit unit 32 includes a voltage detector 32a for detecting the voltage of electricity supplied from the overhead line (trolley line) to the dump truck 2 via the pantograph 4, and a current. A current detector 32b for detection is provided.

Reference numeral 33 denotes a control device that controls operations such as raising and lowering of the pantograph, and this control device 33 includes a calculation unit 33a, a control signal input unit 33b, a measurement circuit input unit 33c, a control signal output unit 33d, and the like. .
Control signals from the pantograph storage limit switch 30d, the key limit switch 23e, the engine start switch 31a, the pantograph ascending command switch 31b, the pantograph descending command switch 31c, and the like are input to the control signal input unit 33b.

The measurement circuit input unit 33c receives a voltage value and a current value measured by the pantograph main circuit unit 32.
Various arithmetic signals from the control signal input unit 33b, voltage values and current values from the measurement circuit input unit 33c, and the like are input to the arithmetic unit 33a. The arithmetic unit 33a moves the pantograph 4 up and down. And a control signal for opening and closing the key device 23 are generated. The generated control signal is sent to the solenoid 30a for controlling the pressure oil to the main hydraulic cylinder 20 and the solenoid 30b for controlling the pressure oil to the key hydraulic cylinder 23c via the control signal output unit 33d. 30c, etc., and thereby, the raising and lowering of the pantograph 4 and the opening and closing of the key device 23 are controlled.

Next, the control operation of the pantograph 4 will be described based on the control block diagram of FIG. 6 and the flowcharts shown in FIGS.
FIG. 7 is a diagram for explaining the flow during the pantograph ascent control. In the initial state, it is assumed that the pantograph 4 is stored and the key device 23 is also closed. The solenoids 30a to 30c are also OFF, the pantograph storage limit switch 30d is ON, and the key limit switch 30e is OFF.

  From this state, when the operator turns on the engine start switch 31a and starts the engine (step 40), the electric circuit is turned on, and the hydraulic circuit is also turned on with the hydraulic pressure increased (step 41). When the electric circuit and the hydraulic circuit are turned on, the control device 33 receives an ON signal from the pantograph storage limit switch 30d, turns on the solenoid 30b, and closes the key portion 23a of the key device 23. Pressure oil is sent to the hydraulic cylinder 23c. At this time, the key portion 23a of the key device 23 is already closed, but no hydraulic pressure is applied to the key hydraulic cylinder 23c. By turning on the solenoid 30b, the key for the key 23a is closed. Hydraulic pressure is applied to the hydraulic cylinder 23c so that the pipe (fixing member) 25 attached to the upper part of the pantograph frame is firmly and constantly pressed by the hook portion 23a (step 42). As a result, the pantograph 4 is firmly fixed without rattling against intense vibration or shaking during traveling in the non-trolley mode.

  When traveling in the trolley mode, the operator turns on the pantograph lift command switch 31b (step 43). When the control device 33 receives this signal, the arithmetic unit 33a turns off the solenoid 30b, turns on the solenoid 30c, and operates the key hydraulic cylinder 23c so that the key portion 23a of the key device 23 opens. (Step 44). When the key 23a is opened, the key limit switch 23e is turned on. Upon receiving this signal, the calculation unit 33a turns off the solenoid 30c, turns on the solenoid 30a, and sends the hydraulic pressure so that the main hydraulic cylinder 20 contracts. (Step 45), thereby raising the pantograph 4 (Step 46).

  When the pantograph 4 starts to rise, the pantograph storage limit switch 30d is turned off, and the pantograph further rises to come into contact with the overhead wire (trolley line) 1 and starts collecting current. In step 47, from the voltage and current values detected by the pantograph main circuit unit 32, the calculation unit 33a determines whether or not current collection from the trolley line has been completed. If the current can be collected, it is determined that the ascent operation of the pantograph is normally completed (step 48), and the traveling in the trolley traveling mode is started.

  If it is determined in step 47 that current collection from the trolley line has not been completed even if the pantograph has been lifted, it is determined that the pantograph has been lifted abnormally (step 49). A pantograph descending command is issued (step 50), and the pantograph descending operation is performed in accordance with the pantograph descending control flow shown in FIG. 8 to check the pantograph (step 51).

Next, a control flow for lowering the pantograph will be described with reference to FIG.
When the dump truck 1 is switched from traveling in the trolley traveling mode to traveling in the non-trolley traveling mode, in this embodiment, the pantograph 4 is lowered and stored, and further fixed by the key device 23 so that the pantograph is Be able to run without rattling against vibration and shaking. The control flow will be described below.

  When switching from the trolley travel mode to the non-trolley travel mode, the operator turns on the pantograph lowering command switch of the driver's seat operation unit 31 (step 52). As shown in step 50 of FIG. 7, a pantograph lowering command may be issued from the control device 33 when the pantograph is abnormally raised.

  When the pantograph lowering command is issued, the computing unit 33a turns off the pantograph ascending command, the solenoid 30a is turned off, and the main hydraulic cylinder 20 is released, so that the main hydraulic cylinder 20 extends (step 53). As a result, the pantograph 4 descends, and when the current is being collected in the trolley travel mode, the current collection boat stops away from the trolley line, and the current collection is stopped (step 54).

  When the descent of the pantograph is completed, the pantograph storage limit switch 30d is turned on (step 55), and the control device 33 receives this signal, and the solenoid 30b is turned on from the calculation unit 33a via the control signal output unit 33d. A command is output so that pressure oil is sent to the key hydraulic cylinder 23c so as to close the key part 23a of the key device 23 (step 56). Thereby, the pipe (fixing member) 25 attached to the pantograph at the hook portion 23a can be firmly and constantly pressed, and traveling in the non-trolley mode (engine traveling) is possible (step). 57).

  According to this embodiment, when the vehicle is traveling in the non-trolley mode, the operator simply turns on the pantograph lowering command switch 31c, and the pantograph is automatically stored and can be firmly and constantly pressed by the key device. it can. Therefore, the pantograph can be firmly fixed so that the pantograph does not rattle against intense vibration or shaking during traveling in the non-trolley mode.

  In addition, according to the present embodiment, when the engine is started from the state where the dump truck 1 is stopped, the pantograph can be automatically pressed firmly and fixedly, so that the pantograph does not rattle when traveling in the non-trolley mode. It can be surely prevented from sticking.

  Further, when traveling in the trolley mode, only by turning on the pantograph ascending command switch 31b, the key device 23 is opened, and the pantograph is lifted to enable traveling in the trolley mode. Here, if current cannot be collected from the trolley wire, the pantograph is automatically lowered, and the pantograph is firmly fixed by the key device 23, so that the pantograph is prevented from being damaged. At the same time, it is possible to travel in the non-trolley mode, and it is possible to know the abnormality of the pantograph ascent operation.

  As described above, according to the present embodiment, when the truck travels in the non-trolley mode, the pantograph can be automatically pressed firmly and fixedly by the key device, so that the truck vibrates violently while traveling. Even if it is greatly shaken, the state in which the frame of the pantograph 4 is firmly fixed to the base frame 6 can be kept, and an effect of reliably preventing the pantograph frame from being deformed or damaged can be obtained.

1: overhead line (trolley line),
2: Dump truck,
3: Pantograph mounting base,
4: Pantograph, 5: Current collector boat, 6: Underframe, 7: Swing support shaft,
8: Lower frame, 8a: Projection, 9: Connection shaft, 10: Upper frame, 10a: Projection,
12: Spring, 13: Slide plate,
15: Lower balancing bar, 17: Upper balancing bar,
18: Link arm, 19: Swing member, 20: Main hydraulic cylinder (pantograph drive source),
21: Boat receiver, 22: Boat support,
23: Key device, 23a: Key part, 23b: Support member, 23c: Key hydraulic cylinder (key drive source), 23e, 30e: Key limit switch (key part opening / closing detection means),
24 key holder, 24a: receiving part, 24b: base part, 24c: rubber plate (elastic material),
25: Pantograph fixing pipe (fixing member),
27: Framework guide (frame roll prevention means),
30: Pantograph control circuit unit, 30a to 30c: solenoid, 30d: pantograph storage limit switch (pantograph storage detection means),
31: Dump truck driver seat operation section, 31a: Engine start switch, 31b: Pantograph lift command switch, 31c: Pantograph lift command switch,
32: Pantograph main circuit, 32a: voltage detector, 32b: current detector,
33: control device, 33a: calculation unit, 33b control signal input unit, 33c: measurement circuit input unit,
33d: Control signal output unit.

Claims (5)

Equipped with a pantograph mounted on the top of the truck and a control device that controls this pantograph, running in combination with a trolley mode that travels with power obtained from an overhead line and a non-trolley mode that travels without obtaining power from the overhead line In a pantograph control device for a trolley truck,
The pantograph includes a base frame, a lower frame swingably attached to the base frame, an upper frame swingably attached to the lower frame, a current collector boat supported by the upper frame, and a pantograph A key device for fixing the upper frame to the underframe in a folded state,
The control device, when a pantograph lowering command is input, controls to lower the pantograph, and after the pantograph is stored, controls the key device to fix the pantograph ,
The pantograph includes a pantograph drive source for raising and lowering the pantograph and a key drive source for driving the key device, and the control device includes a calculation unit and a control for taking a control signal into the calculation unit. A signal input unit and a control signal output unit that outputs a control signal from the calculation unit, and when the pantograph lowering command is input to the control signal input unit, the calculation unit is configured to lower the pantograph After storing the control signal for controlling the pantograph drive source and the pantograph, the control signal output unit outputs a control signal for controlling the key drive source so as to fix the pantograph,
A fixing member for fixing the pantograph is provided on the front end side of the upper frame of the pantograph, a key driving source for driving the key device is constituted by a hydraulic cylinder for the key, and the fixing member for fixing the pantograph is connected to the key. Press and fix with a hydraulic cylinder for
The key device includes a key part for pressing the fixing member, and a support member that rotatably holds the key part, and the fixing member is rotated by the key hydraulic cylinder. Press the
In order to receive the fixing member pressed by the key device, the base frame is provided with a key holder, and when the frame composed of the lower frame and the upper frame is folded, the fixing member is seated on the key holder. And a pantograph control device for a trolley truck, wherein the pantograph control device is configured to be pressed by the key device and fixed to a frame . 2. The pantograph storage detecting means for detecting the storage state of the pantograph according to claim 1 , and the keying device is provided with a key part opening / closing detecting means for detecting an opening / closing state of the key part. Pantograph control device for trolley trucks. 3. The control device according to claim 2 , wherein when the engine start signal is input, when the pantograph is in a retracted state, the control device presses and fixes the fixing member for fixing the pantograph with the hydraulic cylinder for the key, A pantograph control device for a trolley type truck, characterized in that control is performed so as to maintain a stable lock state. The control device according to claim 3 , wherein when the pantograph ascending command signal is input, the control device controls to raise the pantograph, and even when the pantograph has been lifted, if the current cannot be collected from the trolley wire, A pantograph control device for a trolley type truck, wherein the pantograph is controlled to move downward. In Claim 3 , when the frame constituted by the lower frame and the upper frame is in a folded state, roll prevention means for preventing the roll of the frame is provided in the frame. Pantograph control device for trolley truck.

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