JP4000181B2 - Plate compactor - Google Patents

Description

  The present invention relates to a plate compactor used for asphalt pavement and the like.

  The plate compactor generally includes an engine disposed at the top, an exciter connected to the engine via a belt suspension mechanism, and vibration that vibrates by the exciter and compacts the asphalt mixture on the road floor. A board. In this type of plate compactor, the asphalt mixture often adheres to the surface of the diaphragm on the road floor side, which may cause damage to the compacted surface of the asphalt mixture. Therefore, in the conventional plate compactor, water is sprayed on the surface of the asphalt mixture in front of the plate compactor.

  However, this method requires extra manpower to spray water on the surface of the asphalt mixture, and it is not easy to secure the amount of water necessary for spraying. Furthermore, in this method, the temperature of the asphalt mixture is drastically lowered by spraying water on the surface of the asphalt mixture, so when the asphalt mixture in such a state is compacted with a plate compactor, the asphalt mixture There is a problem that cracks and irregularities are generated on the compacted surface of the material, and the finished state of the compacted surface of the asphalt composite material is deteriorated.

  In order to cope with these problems, for example, in the plate compactors disclosed in Patent Documents 1 and 2, a heater is attached to the diaphragm, and an abutting portion that abuts against the asphalt mixture of the diaphragm is provided on the asphalt. It is heated to a temperature at which the composite material does not adhere (for example, 70 ° C. to 100 ° C.).

  Of the above plate compactors, the plate compactor disclosed in Patent Document 1 includes a generator driven by an engine. In this plate compactor, the engine is started, the generator is driven, and then the heater is switched on. After the diaphragm reaches a certain temperature, the engine speed is increased and asphalt pavement is started.

  However, in this method, the diaphragm vibrates because the engine is operating at a low speed until the diaphragm is heated to a certain temperature by the heater. As a result, the plate compactor can move forward due to the vibration of the diaphragm, even though the diaphragm has not reached a certain temperature. As a result, in this plate compactor, asphalt mixture can adhere to the roadbed side surface of the diaphragm as described above. This can cause scratches on the compacted surface of the asphalt mixture.

  In this case, in order to avoid this, the rotational speed of the engine may be extremely smaller than the rotational speed of the engine when asphalt paving. However, in that case, since the output of the generator is reduced, there arises a new problem that even if the diaphragm is heated by the heater, it cannot be heated to an appropriate temperature or the heating time becomes long. It is not practical to reduce the engine speed.

Further, since this type of plate compactor vibrates violently, the connection portion of the wiring that electrically connects the generator and the heater is often disconnected. Therefore, the plate compactor cannot often be operated stably.
JP 10-317314 A JP 2001-020213 A

  The present invention has been made in view of the circumstances as described above, and is compact and stable in its state by heating the diaphragm to a predetermined temperature range in which asphalt composite material does not adhere to the diaphragm in a relatively short time. It is an object of the present invention to provide a plate compactor that can be maintained on a regular basis.

The plate compactor of the present invention is equipped with an engine, a generator that is drivably connected to the engine, a vibrator driven by the engine, and a heating element that is electrically connected to the generator. A plate compactor including a diaphragm heated by a body and vibrated by the vibrator to compact asphalt composite material, first power transmission means for transmitting power from the engine to a generator; Second power transmission means for transmitting and interrupting power to the vibrator, temperature detection means for detecting the temperature of the diaphragm, and the temperature based on the temperature of the diaphragm detected by the temperature detection means with the temperature of the diaphragm and the heating element control to that control means the operation of to be within a predetermined temperature range that does not adhere asphalt mixture to said diaphragm, said first The force transmission means includes a first pulley attached to the drive shaft of the engine, a second pulley attached to the first driven shaft of the generator, the first pulley and the second pulley. And a second belt that is mounted on the engine drive shaft at a predetermined distance from the first pulley in the axial direction. A pulley, a fourth pulley mounted on the second driven shaft of the vibrator, and a second belt wound around the third pulley and the fourth pulley. After the engine is started, the power from the engine to the vibrator is cut off until the temperature of the diaphragm reaches a predetermined temperature range, and the power from the engine to the vibrator is transmitted after the temperature of the diaphragm reaches the predetermined temperature range. Manually engage the third pulley with the engine drive shaft Made with a clutch for pre-separation.

  In general, when the engine is started, the generator is driven by the first power transmission means. Then, the heating element generates heat by the electric power supplied from the generator. Due to this heat generation, the heating element heats the diaphragm. When the diaphragm reaches a predetermined temperature range, the vibrator is operated by the second power transmission means to vibrate the diaphragm. As a result, the diaphragm compacts the asphalt mixture on the road floor.

  By doing as described above, it is possible to use all of the engine power for driving the generator, that is, for heating the diaphragm by the heating element when the engine is started. As a result, the diaphragm can be heated to a predetermined temperature range in which the asphalt mixture does not adhere to the diaphragm in a relatively short time, and the state can be stably maintained.

  Since the diaphragm does not vibrate from when the engine is started until the temperature of the diaphragm reaches a predetermined temperature range, the plate compactor does not move due to vibration. Therefore, the diaphragm does not compact the asphalt mixture on the road floor in a state where the temperature of the diaphragm is lower than the predetermined temperature range. As a result, asphalt mixture does not adhere to the diaphragm when the engine is started. This makes it possible to prevent the quality of the compacted surface of the asphalt mixture from deteriorating.

It is preferred clutches are electromagnetic clutches. Thereby, it becomes possible to make the whole plate compactor compact.

  It is preferable that the temperature detecting means is a thermostat. Of course, the temperature detecting means may be a thermocouple or a resistance temperature element. Thereby, the temperature of the diaphragm can be controlled with high accuracy. In addition, the entire plate compactor can be made compact.

  Another plate compactor according to the present invention is equipped with an engine, a generator drivably connected to the engine, a vibrator driven by the engine, and a heating element electrically connected to the generator A plate compactor comprising a diaphragm heated by the heating element and vibrated by the vibrator to compact the asphalt mixture, wherein the heating element is electrically connected to the wiring from the generator A first fixing member having a penetrating portion connected to the terminal and a penetrating portion of the first fixing member. A second fixing member that is electrically connected to the terminal when the terminal is connected to the first fixing member, and is inserted through the wiring so as to be movable and penetrates the first fixing member. Installed on the generator side Comprising a position regulating member for regulating the position of the wiring, the first fixing member to the terminal, and a resilient member surrounding these members in a state of mounting the second fixing member and the position regulating member Te.

More specifically, the heating element includes a terminal that is formed in a rod shape, has an external thread on the outer peripheral surface, and is electrically connected to the generator protruding in an axial direction from one end of the heating element. the first of said internally threaded to be screwed are formed in the terminal on the inner peripheral surface of the through portion of the fixing member, the second fixing member, the terminal end of the wire from the previous SL onset electric It is preferable that the terminal is screwed into the penetrating portion of the first fixing member to be inserted and fixed to a predetermined position of the penetrating portion. The position restricting member is preferably made of a material having elasticity (for example, urethane), and is preferably formed in a truncated cone shape and has a hole through which the wiring passes. The elastic member is preferably made of an insulating material (for example, vinyl chloride) and formed in a tube shape.

  In the above configuration, since the connection portion between the terminal of the heating element and the wiring from the generator is fixed with a material having elasticity, even if the diaphragm vibrates, the vibration has the elasticity. Is absorbed by. As a result, it is possible to prevent disconnection at the connection portion. As a result, the temperature of the diaphragm can be stably maintained within a predetermined temperature range, and the plate compactor can be stably operated for a long time.

  According to the plate compactor according to the present invention, the entire apparatus can be made compact, and the diaphragm is heated to a predetermined temperature range in which the asphalt mixture does not adhere to the diaphragm in a relatively short time, and the state is stably maintained. be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Drawing 1 is an outline view showing an example of composition of a plate compactor concerning an embodiment of the present invention, (a) is a partially broken front view, and (b) is a side view. For convenience of explanation, the traveling direction of the plate compactor is referred to as the front, the opposite side is referred to as the rear, the left side relative to the traveling direction is referred to as the left, and the right side is referred to as the right.

  As shown in FIG. 1A, the plate compactor 1 includes an engine 2, a generator 3 connected to the engine 2 so as to be drivable, a vibrator 4 driven by the engine 2, and the generator 3, a heater 5 electrically connected to 3, a diaphragm 6 that is heated by the heater 5 and vibrates by the vibrator 4 and compacts the asphalt mixture, and a control panel 7 that controls these operations, And a base plate 8 for mounting these components.

  More specifically, the base plate 8 is formed in a long plate shape, and is disposed above the diaphragm 6 so that the longitudinal direction thereof coincides with the front-rear direction of the plate compactor 1. Above the rear portion of the base plate 8, an engine base 9 on which the engine 2, the generator 3 and the control panel 7 are installed is disposed. The engine base 9 is formed in a U-shaped cross section, and is arranged so that both sides thereof extend in the front-rear direction. The engine base 9 is formed so that the bottom and both sides thereof are flat, and the opening to the inner surface of the bottom faces the base plate 8 side.

  On the upper surface of the rear portion of the base plate 8, a support plate 10 is erected to support the engine base 9 from the inner surface side of the left and right side portions. Four support plates 10 are provided, and two support plates 10 are arranged at a predetermined distance in the front-rear direction, and the two front support plates 10 and the two rear support plates 10 are respectively spaced a predetermined distance in the left-right direction. Are arranged. The number of support plates 10 is four here, but is not limited to this. For example, six support plates 10 may be provided. A portion of each support plate 10 that faces the inner surfaces of the left and right side portions of the engine base 9 is a vibration isolation member (for example, an anti-vibration member) that blocks vibration transmitted from the vibrator 4 to the engine base 9 through the base plate 8. A vibration rubber 11 is attached to each. The engine stand 9 is connected to each support plate 10 via a corresponding vibration isolation member 11. As a result, transmission of vibrations to the engine base 9 by the vibrator 4 can be suppressed. As a result, it is possible to prevent damage caused by vibration of the engine 2 and the generator 3.

  A handle 12 for a worker to hold is provided at the rear of the engine base 9 so as to extend rearward and obliquely upward. The handle 12 is formed, for example, by bending a pipe material into a U shape, and an open end portion thereof is attached to the rear portion of the engine base 9.

  The engine 2 is arranged on the upper surface of the rear portion of the engine base 9 adjacent to the front of the handle 12. The engine 2 is a known two-cycle or four-cycle gasoline engine, for example. A drive shaft 13 extending outward is provided near the center of the left side surface of the engine 2.

  As shown in FIG. 1B, the drive shaft 13 includes a first pulley 14 that transmits power to the generator 3 and a third pulley 15 that transmits and blocks power to the vibrator 4. Attached at a predetermined distance in the axial direction. The first pulley 14 is disposed outside the third pulley 15 in the axial direction of the drive shaft 13. Details will be described later.

  As shown in FIG. 1A, the generator 3 is disposed adjacent to the front of the engine 2 on the left side of the upper surface of the front portion of the engine base 9. This generator 3 is formed of, for example, a known AC generator. Of course, a DC generator or the like may be used as the generator 3. Near the center of the left side surface of the generator 3, a first driven shaft 16 extending outward is provided. The first driven shaft 16 is arranged so that both axes are substantially parallel to the drive shaft 13. A second pulley 17 is attached to the first driven shaft 16. A first belt 18 is wound around the second pulley 17 and the first pulley 14. The first belt 18 is a known V belt, for example. With the above configuration, power can be transmitted from the engine 2 to the generator 3.

  The first and second pulleys 14 and 17 and the first belt 18 constitute first power transmission means. However, the first power transmission means is not limited to the above configuration. For example, a timing belt or the like may be used as the first belt 18 instead of the V belt. A sprocket may be used instead of the first and second pulleys 14 and 17, and a chain may be used instead of the first belt 18. This also enables power to be transmitted from the engine 2 to the generator 3.

  A mounting base 7a on which the control panel 7 is installed is attached to the right side of the upper surface of the front portion of the engine base 9 along with the generator 3 so as to extend forward. The control panel 7 is mounted on the mounting base 7a via a vibration isolating member (not shown) made of high resilience urethane or high resilience rubber. It is preferable that the base in the control panel 7 is coated with silicon, the wiring in the control panel 7 is a robot line, and the wiring connected to the control panel 7 is a robot line. As a result, vibration transmitted from the engine 2 or the generator 3 to the control panel 7 can be suppressed, and failures in the control panel 7 such as disconnection, screw loosening, and dropout due to the vibration can be prevented. . As a result, the operation of the plate compactor 1 can be stably controlled.

  A vibration exciter 4 is disposed on the upper surface of the front portion of the base plate 8. Near the center of the left side surface of the vibration exciter 4, a second driven shaft 19 extending outward is provided. The second driven shaft 19 is arranged so that both axes are substantially parallel to the drive shaft 13. A fourth pulley 20 is attached to the second driven shaft 19. A second belt 21 is wound around the fourth pulley 20 and the third pulley 15. Further, the third pulley 15 is configured to be disengaged from the drive shaft 13. Details will be described later. The second belt 21 is formed of, for example, a known V belt, like the first belt 18. With the above configuration, it is possible to transmit or block power from the engine 2 to the vibration exciter 4.

  The third and fourth pulleys 15 and 20 and the second belt 21 constitute second power transmission means. However, the second power transmission means is not limited to the above configuration. For example, a timing belt or the like may be used as the second belt 21 instead of the V belt. A sprocket may be used instead of the third and fourth pulleys 15 and 20, and a chain may be used instead of the second belt 21. This also allows power to be transmitted from the engine 2 to the vibration exciter 4 or shut off.

  The second driven shaft 19 includes an eccentric portion that is bent in a U shape at an axially intermediate portion, although not shown. This eccentric part is located in the casing of the vibrator 4. When the second driven shaft 19 is rotated by the engine 2, the eccentric portion rotates to generate vibration. This vibration is transmitted through the base plate 8 to the diaphragm 6 connected thereto. Thereby, the diaphragm 6 vibrates so as to rotate up and down and up and down.

  Further, the structure of the third pulley 15 will be described in detail with reference to FIG. As shown in FIG. 2, the third pulley 15 is engaged with and disengaged from the pulley body 23 by a pulley body 23 mounted on the drive shaft 13 via a bearing 22, an annular electromagnet 24, and the electromagnet 24. An electromagnetic clutch 26 including a clutch unit 25.

  The pulley body 23 is provided with two V-shaped grooves 23a surrounding the second belt 21 on the outer periphery thereof. The respective grooves 23a are arranged in parallel with a predetermined distance apart in the plate thickness direction of the pulley body 23 (substantially the same direction as the axial direction of the drive shaft 13). In addition, an annular concave groove 23b for accommodating the annular electromagnet 24 in a non-contact manner is formed in a portion of the pulley body 23 on the engine 2 side. The electromagnet 24 is accommodated in the groove 23b in a non-contact manner.

  The clutch portion 25 is disposed between the pulley body 23 of the drive shaft 13 and the first pulley 14. The clutch portion 25 is moved from a predetermined position to the pulley body 23 side by the magnetic force of the electromagnet 24 when the electromagnet 24 is turned on, and is engaged with the first pulley 14 side surface 23c of the pulley body 23. The engagement member 25a and the biasing force for pulling the engagement member 25a away from the surface 23c on the first pulley 14 side of the pulley body 23 to return to the predetermined position when the electromagnet 24 is turned off. A member 25b and a support member 25c that supports the engagement member 25a via the biasing member 25b are provided.

  The engaging member 25a, the urging member 25b, and the support member 25c are arranged in this order from the pulley body 23 side.

  The engaging member 25a is made of, for example, two large and small annular plates, and is attached to the pulley body 23 side of the urging member 25b. Each engagement member 25 a is disposed concentrically with the drive shaft 13.

  The support member 25 c is made of, for example, a triangular plate material, is disposed concentrically with the drive shaft 13, and is erected on the outer peripheral portion of the drive shaft 13. The support member 25c is formed such that the outer diameter of a virtual circumscribed circle passing through each apex is substantially the same as the outer diameter of the engagement member 25a having a smaller diameter among the engagement members 25a. Each top portion of the support member 25c is connected to a small-diameter engagement member 25a.

  The urging member 25b includes, for example, a plurality of leaf springs, and is attached to the surface of the support member 25c on the pulley body 23 side so as to be urged and deenergized in the axial direction of the drive shaft 13. Although not shown, each urging member 25b is disposed so as to extend from the support member 25c to the large and small engaging members 25a, and is connected to these members 25a and 25c. The connecting portion between the urging member 25b and each member 25a, 25c is equally arranged in the circumferential direction of each member 25a, 25c. Of course, these connecting portions are arranged so as not to interfere with the connecting portions between the top portions of the support member 25c and the small-diameter engaging members 25a.

  The electromagnet 24 is made of a known air-core coil, for example. The magnetic force of the electromagnet 24 overcomes the urging force of the urging member 25 b and engages the engaging member 25 a with the surface 23 c on the first pulley 14 side of the pulley body 23 to rotate the pulley body 23 together with the drive shaft 13. It is set to be able to let you.

  As described above, the third pulley 15 can be engaged with and disengaged from the drive shaft 13. As a result, as described above, it is possible to transmit or block power from the engine 2 to the vibration exciter 4.

  As shown in FIG. 1A, a diaphragm 6 is attached to the lower part of the base plate 8 via a support member (not shown). The front end portion of the diaphragm 6 warps diagonally forward and upward, and the rear end portion of the diaphragm 6 warps diagonally upward and backward. The height positions of the front end and the rear end of the diaphragm 6 are substantially matched with the height positions of the front end and the rear end of the upper surface of the base plate 8. The diaphragm 6 vibrates when the vibration of the vibrator 4 is transmitted through the base plate 8 and the support member.

  As shown in FIGS. 1A and 1B, a heat transfer member 26 for efficiently transferring the heat generated by the heater 5 to the diaphragm 6 is in close contact with the inner surface of the bottom of the diaphragm 6. Attached. The heat transfer member 26 is formed in a long plate shape, and extends along the front-rear direction of the inner surface of the bottom portion of the diaphragm 6, and is spaced a predetermined distance from each other in the left-right direction of the inner surface of the bottom portion of the diaphragm 6. Are arranged in three rows. Each heat transfer member 26 is made of a material having a relatively large thermal conductivity, such as aluminum. Of course, it is not limited to these structures. For example, a coating agent made of silicon (for example, heat-dissipating silicon having a heat resistant temperature of 300 ° C.) may be interposed between the heat transfer member 26 and the diaphragm 6 so as to be in close contact with each other. As a result, the gap between the heat transfer member 26 and the diaphragm 6 is reduced, so that heat conduction from the heat transfer member 26 to the diaphragm 6 can be improved.

  Moreover, although not shown in figure, the concave groove | channel which accommodates the heater 5 is formed in the U shape seeing from upper direction on the upper surface side of each said heat-transfer member 26. As shown in FIG. Each groove extends over the entire top surface of each heat transfer member 26. Of course, the shape of the groove is not limited to this, and is determined so that each heat transfer member 26 is entirely within a predetermined temperature range. Each heater 5 is housed and fixed in each of these grooves. Here, the heater 5 and the heat transfer member 26 are provided separately, but an integrated heater integrally formed by incorporating the heater 5 into the heat transfer member 26 may be used, such as a cast-in heater. . This makes it possible to protect the heater and shorten the assembly time of the heat transfer member and the heater.

  A heat retaining member 27 is attached to the top of each heat transfer member 26 and each heater 5 so as to cover the entire top surface of each heat transfer member 26 and the entire top of each heater 5. Moreover, the heat retaining member 27 is located below the base plate 8. As such a heat retaining member 27, for example, glass wool or heat resistant polyester felt is used. Thereby, the heat generated by the heater 5 can be efficiently transmitted to the diaphragm 6. At the same time, since heat conduction from the heater 5 to components such as the base plate 8 positioned above the heater 5 can be cut off, durability deterioration due to heat of these components can be suppressed.

  Each heater 5 accommodated in each said heat-transfer member 26 consists of a well-known rod-shaped electric heater, for example, and is formed so that the groove shape of each said heat-transfer member 26 may be adapted. Input / output terminals of the heaters 5a and 5b arranged on the left and right heat transfer members 26 are arranged on the left and right sides of the base plate 8 at a predetermined distance, and the heat transfer members 26 corresponding to the respective heaters 5a and 5b. It extends upward so as to stand up from the rear part. Further, the intermediate heater 5 c disposed on the heat transfer member 26 located between the left and right heat transfer members 26 extends upward so as to stand up from the rear portion of each heat transfer member 26. Moreover, the input / output terminal of the heater 5c extends upward through the base plate 8. The input / output terminals of each heater 5 are not shown, but are electrically connected to the generator 3 through the control panel 7. The heating value of each heater 5 is set to 800 W, for example. Here, the heating value of each heater 5 is set to 800 W, but the present invention is not limited to this. Specifically, the amount of heat generated by each heater 5 is appropriately set according to the area of the diaphragm 6 of the plate compactor 1 and the like.

  Above the base plate 8, a temperature sensor 28 for controlling the operation (for example, ON-OFF operation) of each heater 5 is provided. The temperature sensor 28 is arranged between the input / output terminals of the intermediate heater 5c and measures the surface temperature of the intermediate heater 5c as a representative temperature. The set temperature of the temperature sensor 28 is set in advance so that the temperature of the diaphragm 6 falls within a predetermined temperature range (for example, a range of 70 ° C. to 100 ° C.) where the asphalt mixture does not adhere to the diaphragm 6. The set temperature is set to 190 ° C., for example. Thereby, the temperature of the diaphragm 6 is controlled within the predetermined temperature range. As a result, it is possible to prevent the asphalt mixture from adhering to the diaphragm 6.

  A thermostat can be used as the temperature sensor 28. However, the present invention is not limited to this. In addition, for example, a thermocouple or a resistance thermometer can be used as the temperature sensor 28. In this case, the control panel 7 receives temperature information from the temperature sensor, and the control panel 7 controls the operation of the heater 5 based on this temperature information.

  Next, an example of the structure and manufacturing process of the connecting portion between the terminal of each heater 5 and the wiring from the generator 3 will be described with reference to FIG.

  As shown in FIG. 3A, first, an elongated nut 29 is prepared in the axial direction. Subsequently, as shown in FIG. 3 (b), the crimp terminal 31 is attached to the end 30 a of the wiring 30 through the end 30 a of the wiring 30 from the generator 3 through the through hole of the nut 29. The tip part 31a is cut off. Subsequently, as shown in FIG. 3C, the attachment portion between the end 30a of the wiring 30 and the crimp terminal 31 is further brazed (for example, soldering or silver brazing) to improve the joint strength between them. . Then, as shown in FIG. 3 (d), the wiring 30 is pulled to the opposite side of the end 30 a, and the crimp terminal 31 is arranged at a predetermined position in the through hole of the nut 29.

  By the way, as shown in FIG.3 (e), the terminal 5d by which the external thread was formed in the outer peripheral part is provided in the edge part of the heater 5. FIG. A set nut 32 for setting a position where the nut 29 is attached to the terminal 5d is screwed to the terminal 5d. As shown in FIG. 3D, after the crimp terminal 31 is arranged at a predetermined position in the through hole of the nut 29, the tip end of the terminal 5 d is screwed into the nut 29. Then, the crimp terminal 31 is pressed and caulked at a predetermined position in the through hole of the nut 29. Thereafter, the set nut 32 is brought into contact with the end of the nut 29 on the heater 5 side. Thereby, the position of the nut 29 with respect to the terminal 5d is fixed.

  Subsequently, as shown in FIG. 3 (f), a position regulating member 33 for regulating the position of the wiring 30 in the opening is attached to the opening on the side opposite to the heater 5 side of the through hole of the nut 29. The position restricting members 33 are made of, for example, a frustoconical elastic urethane cap having a hole through which the wiring 30 passes in the center, and three are arranged in series. These position restricting members 33 are connected so that the other tapered outer peripheral portion is inserted into one wide hole portion of the adjacent position restricting members 33. Of these position restricting members 33, the tapered outer peripheral portion of the position restricting member 33 closest to the nut 29 is inserted into the through hole of the nut 29. As a result, the position of the wiring 30 is fixed at the opening of the nut 29 described above. Of course, it is not limited to the configuration described above.

  Subsequently, as shown in FIG. 3G, in the state where the nut 29 is attached to the terminal 5d and the position restricting member 33 is attached to the nut 29, the surrounding member 34 for surrounding the periphery of these members is attached. The surrounding member 34 is made of a material having elasticity and insulation (for example, vinyl chloride) and is formed in a tube shape. With the surrounding member 34 attached to the members 5 d, 29, and 33, the filling member 35 is filled into the gap formed between the surrounding member 34 and the terminal 5 d, the nut 29, and the position regulating member 33. As the filling member 35, for example, a filling member made of silicon can be used. Here, the surrounding member 34 and the filling member 35 constitute an elastic member. Instead of the surrounding member 34 and the filling member 35, a heat-shrinkable tube may be used. In this case, with the nut 29 attached to the terminal 5d and the position restricting member 33 attached to the nut 29, the periphery of these members is covered with a heat-shrinkable tube, and hot air is blown from the outside of the tube to thereby apply the member. Close the tube around Thereby, since the filling member 35 can be omitted, the above manufacturing process is simplified.

  By configuring the connection portion 36 between the terminal of each heater 5 and the wiring from the generator 3 as described above, the connection portion 36 can absorb vibrations caused by the diaphragm 6. As a result, it is possible to avoid disconnection at the connection portion 36. As a result, the temperature of the diaphragm 6 can be stably maintained within the predetermined temperature range, and the plate compactor 1 can be stably operated for a long time.

  Next, the control panel 7 will be described with reference to FIG. As shown in FIG. 4, the control panel 7 includes, for example, a heater output unit 37, a heater temperature control unit 38, a switching power supply unit 39, a generated voltage control unit 40, a clutch switch 41, and a rectifier 42.

  The heater output unit 37 has an input side electrically connected to the generator 3 and an output side electrically connected to the heater 5. The heater output unit 37 is configured to supply and cut off electric power (for example, AC 200 V, three phases) input from the generator 3 to the heater 5. Further, although not shown, an ON / OFF switch may be provided between the heater output unit 37 and the heater 5. Thereby, the user can freely select the operation timing of the heater 5.

  The heater temperature control unit 38 is communicably connected to the temperature sensor 28 and is optically coupled to the heater output unit 37 through, for example, a photocoupler. The heater temperature control unit 38 is configured to control the operation of the heater output unit 37 in accordance with the ON / OFF operation of the temperature sensor 28.

  The switching power supply unit 39 is electrically connected to the generator 3. The switching power supply unit 39 is electrically connected to the heater temperature control unit 38, the generated voltage control unit 40, and the electromagnet 24 via the clutch switch 41. The switching power supply unit 39 transforms the electric power input from the generator 3 into a predetermined electric power (for example, DC12V), and this electric power is supplied to the heater temperature control unit 38, the generated voltage control unit 40, and the clutch. The operation power is supplied to the electromagnet 24 via the switch 41.

  The generated voltage control unit 40 is optically coupled to a power line from the generator 3 to the heater output unit 37 and the switching power supply unit 39 through, for example, a photocoupler. The generated voltage control unit 40 is communicably connected to the generator 3. The generated voltage control unit 40 is configured to acquire the output voltage of the generator 3 through a photocoupler and to control the output voltage of the generator 3 based on the output voltage.

  The clutch switch 41 is formed of, for example, a known manual ON / OFF switch, and is provided between the switching power supply unit 39 and the electromagnet 24 as described above. When the clutch switch 41 is turned on, the electromagnet 24 is energized, and the engaging member 25a of the clutch portion 25 is attracted to the electromagnet 24 by the magnetic force of the electromagnet 24, and the surface of the pulley body 23 on the first pulley 14 side. 23c is engaged. As a result, the power of the engine 2 is transmitted to the vibrator 4 through the third pulley 15, the second belt 21 and the fourth pulley 20. Conversely, when the clutch switch 42 is turned off, the electromagnet 24 is deenergized and demagnetized. As a result, the engaging member 25a of the clutch portion 25 is pulled away from the surface 23c on the first pulley 14 side of the pulley body 23 by the urging force of the urging member 25b and returns to the original position. Thereby, transmission of the power of the engine 2 to the third pulley 15 is interrupted.

  The rectifier 42 is electrically connected to a power generation unit 43 attached to the engine 2 and is also electrically connected to a field coil (not shown) of the generator 3. The rectifier 42 transforms an input voltage (for example, AC 12 V) from the power generation unit 43 of the engine 2 into an initial excitation voltage (for example, DC 12 V) to the field coil of the generator 3. A circuit from the power generation unit 43 of the engine 2 to the generator 3 through the rectifier 42 is used to supply an initial excitation voltage for the generator 3. Of course, the present invention is not limited to this. For example, a battery may be provided in the control panel 7 and the initial excitation voltage of the generator 3 may be supplied from this battery. Thereby, the power generation unit 43 and the rectifier 42 of the engine 2 can be omitted. Needless to say, the rectifier 42 and the like are not necessary when the generator 3 is of a type that does not need to supply the initial excitation voltage.

  Finally, the operation of the plate compactor 1 according to this embodiment will be described.

  First, the engine 2 is started manually. The power generation unit 43 of the engine 2 generates power, and the initial excitation voltage is supplied from the power generation unit 43 to the field coil of the generator 3 through the rectifier 42 of the control panel 7. Then, the generator 3 starts power generation.

  Thereafter, the ON / OFF switch between the heater output unit 37 and the heater 5 is manually turned on. Then, current flows through the heater 5 and the heater 5 generates heat. Heat generated by the heater 5 is transmitted to the diaphragm 6 through the heat transfer member 26. Thereby, the diaphragm 6 is heated.

  When the temperature of the temperature sensor 28 exceeds 190 ° C., the heater temperature control unit 38 cuts off the power supply to the heater 5. When the temperature of the temperature sensor 28 falls below 190 ° C., the heater temperature control unit 38 supplies power to the heater 5. By repeating these operations, the temperature of the diaphragm 6 can be controlled within a predetermined temperature range (70 ° C. to 100 ° C.) where the asphalt mixture does not adhere to the diaphragm 6.

  After the temperature of the diaphragm 6 reaches a predetermined temperature range, the clutch switch 41 is manually turned on. Then, the power of the engine 2 is transmitted to the vibration exciter 4, and the vibration exciter 4 vibrates the diaphragm 6. Thereby, the diaphragm 6 vibrates so as to rotate in the front-rear and up-down directions to kick the asphalt mixture on the road floor. Due to this vibration, the plate compactor 1 moves forward, and at the same time, the diaphragm 6 of the plate compactor 1 compacts the asphalt mixture on the road floor. In this way, asphalt pavement is performed.

  When finishing the asphalt pavement, the clutch switch 41 is manually turned off, and the above-mentioned on / off switch is manually turned off. Thereafter, the operation of the engine 2 is manually stopped.

  Here, the engine 2, the clutch switch 41, and the above-described ON / OFF switch are manually operated. However, these components or devices are operated with predetermined start and stop signals (for example, the drive shaft 13 of the engine 2). May be automatically started and stopped based on the rotation speed signal).

  As described above, the plate compactor can be made compact, and the diaphragm can be heated to a predetermined temperature range in which the asphalt mixture does not adhere to the diaphragm in a relatively short time, and the state can be stably maintained.

  In addition, since the plate compactor 1 includes the generator 3, the power of the generator 3 can be used for other purposes (for example, for lighting) when the asphalt pavement is not performed.

  The above-described embodiment is an example, and various modifications can be made without departing from the spirit of the present invention, and the present invention is not limited to the above-described embodiment.

  The present invention can be applied to an application in which it is indispensable to stably heat the diaphragm to a predetermined temperature in a relatively short time.

The present invention is illustrated by way of example in the accompanying drawings, but is not limited thereto. In these drawings, the same reference numerals are assigned to equivalent members.
It is an external view which shows an example of a structure of the plate compactor which concerns on embodiment of this invention, (a) is a partially broken front view, (b) is a side view. It is sectional drawing which shows an example of a structure of the 3rd pulley of the plate compactor which concerns on embodiment of this invention. It is a conceptual diagram which shows an example of the structure of the connection part of the terminal of the heater of the plate compactor which concerns on embodiment of this invention, and the wiring from a generator, and a manufacturing process, (a)-(g) shows each manufacturing process. ing. It is a block diagram which shows an example of a structure of the control panel of the plate compactor which concerns on embodiment of this invention.

Claims (7)

An engine, a generator drivably connected to the engine, a vibrator driven by the engine, and a heating element electrically connected to the generator are mounted and heated by the heating element A plate compactor including a diaphragm that vibrates and compacts the asphalt mixture,
First power transmission means for transmitting power from the engine to the generator;
Second power transmission means for transmitting and interrupting power from the engine to the vibrator;
Temperature detecting means for detecting the temperature of the diaphragm;
System temperature of the diaphragm based on the temperature of the diaphragm detected by the temperature detection means that controls the operation of the heating element so as to be within a predetermined temperature range that does not adhere asphalt mixture to said diaphragm With means ,
The first power transmission means includes a first pulley attached to a drive shaft of the engine, a second pulley attached to a first driven shaft of the generator, and the first pulley. And a first belt wound around the second pulley,
The second power transmission means includes a third pulley mounted on the engine drive shaft at a predetermined distance from the first pulley in the axial direction, and a second driven shaft of the vibrator. A fourth pulley mounted, and a second belt wound around the third pulley and the fourth pulley; and
After the engine is started, power from the engine to the vibrator is cut off until the temperature of the diaphragm reaches a predetermined temperature range, and power is transmitted from the engine to the vibrator after the temperature of the diaphragm reaches the predetermined temperature range. Thus, a plate compactor comprising a clutch for manually engaging and disengaging the third pulley with respect to the drive shaft of the engine . The clutch is an electromagnetic clutch, plate compactor according to claim 1. The plate compactor according to claim 1 , wherein the temperature detecting means is a thermostat. An engine, a generator drivably connected to the engine, a vibrator driven by the engine, and a heating element electrically connected to the generator are mounted and heated by the heating element A plate compactor including a diaphragm that vibrates and compacts the asphalt mixture,
The heating element includes a terminal electrically connected to the wiring from the generator,
The connection between the terminal and the wiring from the generator is
A first fixing member having a penetrating portion connected to the terminal;
A second fixing member that is inserted into the through portion of the first fixing member and electrically connected to the terminal when the terminal is connected to the first fixing member;
A position restricting member that is extrapolated movably to the wiring and is attached to the generator side of the penetrating portion of the first fixing member to restrict the position of the wiring;
A plate compactor comprising: a resilient member that surrounds the periphery of the first fixing member, the second fixing member, and the position regulating member attached to the terminal. The heating element is formed in a rod shape, has a male screw on the outer peripheral surface, and includes a terminal electrically connected to the generator protruding in an axial direction from one end of the heating element,
A female screw to be screwed to the terminal is formed on the inner peripheral surface of the through portion of the first fixing member,
Wherein the second fixing member is electrically connected to an end of the terminal side of the wiring from the previous SL onset Electric, said by screwing the terminals into the through portion of the first fixing member The plate compactor of Claim 4 comprised so that it may insert and be fixed to the predetermined position of a penetration part. 5. The plate compactor according to claim 4 , wherein the position restricting member is formed of a material having elasticity, is formed in a truncated cone shape, and has a hole through which the wiring passes. The plate compactor according to claim 4 , wherein the elastic member is made of an insulating material and is formed in a tube shape.

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