JP2007162292A - Asphalt mixture spill preventing device of paving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost by a simple mechanism, by restraining damage when a dump truck contacts and separates, while satisfying an asphalt mixture spill preventive function of a paving machine. <P>SOLUTION: This asphalt mixture spill preventive device is provided with a return mechanism 14 imparting a return tendency to an always erected state to a spillover preventive plate 7 tiltable backward, and a catch mechanism 15 holding the falling-down state of the plate 7 against the return tendency when the plate 7 falls down backward by abutting on a rear part including a rear bumper 8 of the dump truck when the dump truck contacts and releasing a holding state when the dump truck separates. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a composite material spill prevention device for a pavement machine, and in particular, a composite material spill prevention device for a pavement machine capable of suppressing breakage at the time of landing and separation of a dump truck while satisfying a spill prevention function. It is about.

  An example of a conventional pavement machine having a spill prevention function is shown in FIG. In the paving machine 1, a pair of push rollers 5 with which the left and right rear wheels 4 of the dump truck 3 abut on the front end of the machine body 2 are rotatably attached. A hopper 6 is provided at the front of the machine body 2 to receive asphalt mixture from the dump truck 3. On both sides of the front end portion of the hopper 6, horizontally long rubber plates 7 having an appropriate height for preventing spillage are provided so as to prevent the received asphalt mixture from spilling on the road surface. The asphalt mixture received by the hopper 6 is conveyed to the rear of the machine body 2 by a conveyor (not shown), and the conveyed asphalt mixture is expanded to a working width with a screw (not shown) and then paved with a screed (not shown). It is configured to spread on the surface.

  In such a pavement machine having a spill prevention function, the rear bumper 8 of the dump truck 3 comes into contact with the rubber plate 7 for preventing the spill when the dump truck 3 touches and leaves the dump truck 3.

  Further, as a conventional technique related to a composite material spill prevention device for a paving machine, for example, a dump car pressing device in the following paving machine is known. In this prior art, a movable member is provided at the front portion of the traveling vehicle so as to be movable back and forth along the guide member. A hydraulic cylinder for driving the movable member is provided, and a push roller is rotatably attached to a front end portion of the movable member. The traveling vehicle is provided with a distance meter that measures the distance to the rear end face of the dump truck and a controller that controls the operation of the hydraulic cylinder in response to a detection signal of the distance meter.

Then, the push roller is pushed forward to the maximum with a hydraulic cylinder together with the movable member to be in a free state, and the paving machine is advanced while measuring the distance to the rear end face of the dump truck with a distance meter. As the paving machine advances, the push roller hits the rear wheel of the dump truck. However, since the push roller is in a free state together with the movable member, it gradually retracts backward as the paving machine advances. The distance meter measurement signal is input to the controller, and when the distance to the rear end surface of the platform reaches a predetermined value, the controller outputs a command signal to the hydraulic cylinder to fix the movable member at that position. Therefore, even if the dump truck has a different loading width of the loading platform, the loading width of the loading platform with respect to the hopper is constant, the loading platform can be inclined at the optimum position, and there is no risk of spilling asphalt mixture on the road surface (for example, Patent Documents) 1).
Japanese Patent Laid-Open No. 7-102520 (second page, FIGS. 1 and 2).

  In the prior art shown in FIG. 5, the dumper truck's rear bumper comes into contact with the rubber plate for preventing spillage when the dump truck is brought into contact with or detached from the dump truck. When the dump truck comes in contact with the dump truck, the rubber plate is pushed backward while in contact with the rear bumper of the dump truck only by the flexibility of the rubber plate itself. Further, at the time of separation, the rear bumper or the like slightly floats as much as the asphalt composite material as the load on the dump truck becomes almost empty. However, the rubber plate has only the flexibility of the rubber plate itself. Pulled forward while touching. For this reason, it is easy to produce the damage which is torn by the rubber plate.

  In the prior art described in Patent Document 1, a movable member that moves along the guide member, a hydraulic cylinder that drives the movable member, a distance meter that measures the distance to the rear end surface of the dump truck, and a hydraulic cylinder are provided. Many members and devices such as a controller to be controlled are required and the cost is high.

  Therefore, there is a technical problem to be solved in order to suppress the damage at the time of landing and leaving the dump truck while satisfying the spill prevention function, and further to reduce the cost with a simple mechanism. It aims at solving this subject.

  The present invention has been proposed to achieve the above-mentioned object, and the invention according to claim 1 prevents spillage of the received asphalt mixture at the front end portion of a hopper that receives asphalt mixture input from a dump truck. An apparatus for preventing spillage of a composite material for a paving machine by standing a rubber plate for use in a pavement machine, and a rotating means for tiltably supporting the rubber plate, and a spring means for always imparting a tendency to tilt forward to the rubber plate And a composite material spill prevention device for a pavement machine, which has a stopper for restricting the tendency to tilt forward and holding the rubber plate in an upright state.

  According to this configuration, the rubber plate is held in a standing state at the front end portion of the hopper, with the tendency of the spring means to always tilt forward is restricted by the stopper. When the dump truck is brought into contact with the vehicle, the rubber plate is pushed backward while being elastically in contact with the rear bumper or the like due to the flexibility of the rubber plate itself and a tendency to tilt forward by the spring means. When the rear bumper or the like passes rearward, the rubber plate returns to the standing state. When the dump truck is detached, the rubber plate is pushed forward while in contact with the rear bumper or the like due to the flexibility of the rubber plate itself. At this time, since the asphalt composite material as the load is almost empty, the rear bumper and the like are lifted by the amount of the empty space. For this reason, the interference force of the rear bumper etc. with respect to a rubber plate becomes small. And if a dump truck leaves | separates, a rubber plate will return to an upright state.

  The invention according to claim 2 is a composite material spill prevention device for a pavement machine, wherein a plate for preventing the spillage of the received asphalt composite material from standing on a front end portion of a hopper that receives the input of the asphalt composite material from a dump truck. A return mechanism that gives a tendency to always return to the standing position with respect to the plate that can be tilted backward, and abutting against a rear portion including a rear bumper of the dump truck when the dump truck comes in contact with the plate. When the plate falls backwards, the spilled pavement machine has a catch mechanism that holds the fallen state against the return tendency and is released when the dump truck is detached. A prevention device is provided.

  According to this configuration, the spill-preventing plate is held in a standing state at the front end portion of the hopper by the return mechanism. The plate can be tilted only backward, and when contacting the dump truck, it contacts the rear bumper and falls backward. This fallen state is held by the catch mechanism. The dump truck will be disengaged when the asphalt mixture has been put into the hopper. At the time of separation, the asphalt composite material as the load becomes almost empty in the dump truck, and the rear bumper and the like are lifted up by this amount. Therefore, when the dump truck is detached, the rear bumper or the like does not interfere with the plate held in the collapsed state. When the rear bumper or the like passes, the holding state is released, the plate is returned to the standing state by the return mechanism, and spillage of asphalt mixture from the hopper is prevented.

  According to a third aspect of the present invention, the return mechanism includes a rotating portion that supports the plate so as to be tiltable via a support member, a spring means that always gives the plate a tendency to tilt forward, and the forward mechanism. There is provided a composite material spill prevention device for a pavement machine, comprising a stopper for restricting the inclination tendency and holding the plate in the above-mentioned standing state.

  According to this configuration, the plate is always held in the standing state at the front end portion of the hopper while the tendency of the spring means to always tilt forward is restricted by the stopper.

  According to a fourth aspect of the present invention, the catch mechanism is attached to the support member in a direction opposite to the plate, and is latched to rotate forward when the plate is tilted backward, and the catch mechanism is rotated forward. A catch portion that receives the latch portion and elastically holds the latch portion, and is formed on the support member, and is erected in place of the plate when the plate falls backward, and when the dump truck is detached. There is provided a composite material spill prevention device for a pavement machine comprising a release portion that abuts a rear portion including a rear bumper of a dump truck and tilts forward to release a holding state of the latch portion by the catch portion.

  According to this configuration, when the plate falls backward when the dump truck is in contact with the vehicle, the latch portion rotates forward and is elastically held by the catch portion, so that the state where the plate falls is held. The When the dump truck is detached, the release portion that is set up in place of the plate is tilted forward, and the holding state of the latch portion by the catch portion is released. With this release, the plate is restored.

  The invention according to claim 5 provides a composite material spill prevention device for a paving machine, wherein the plate is made of rubber.

  According to this configuration, the plate is made of rubber, so that flexibility is imparted to the plate. Due to this flexibility, the contact impact of the rear bumper or the like against the plate when the dump truck is in contact with the vehicle is mitigated.

  The invention according to claim 1 is characterized in that the rubber plate is supported so as to be tiltable, spring means for always imparting a tilting tendency to the front to the rubber plate, and the rubber plate by restricting the tilting tendency to the front. Since the rubber plate is held in the standing state at the front end portion of the hopper, the spill prevention function can be satisfied. When the dump truck comes in contact with the dump truck, the rubber plate is pushed backward while elastically contacting the rear bumper or the like by the flexibility of the rubber plate itself and the elasticity of the spring means. When the dump truck is detached, it is pushed forward while in contact with the rear bumper or the like only by the flexibility of the rubber plate itself, but the rear bumper or the like is slightly lifted so that the interference force of the rear bumper or the like with respect to the rubber plate is reduced. Therefore, it is possible to suppress the damage of the rubber plate when the dump truck is brought in and out of the truck, particularly the damage of the rubber plate when the car is brought in. Further, when the rear bumper or the like passes rearward with respect to the rubber plate when the dump truck is in contact with the vehicle, the rubber plate returns to the standing state. Therefore, spillage of the asphalt mixture can be prevented while the asphalt mixture is being fed from the dump truck to the hopper. Furthermore, the present invention is a simple mechanism including a rotating part, a spring means, and a stopper, and as described above, while satisfying the spill prevention function, it suppresses the damage of the rubber plate when the dump truck touches and leaves. There is an advantage that can be.

  According to the second aspect of the present invention, there is provided a return mechanism that always gives a tendency to return to a standing state with respect to a plate that can be tilted rearward, and a rear portion including a rear bumper of the dump truck when the dump truck comes in contact. The plate has a catch mechanism that holds the plate in a state of falling against the return tendency when the plate falls back in contact and is released when the dump truck is detached. Is maintained in a standing state at the front end of the hopper, so that a spill prevention function can be satisfied. The plate can only be tilted backward, and when the dump truck comes in contact, it falls back while elastically contacting the rear bumper etc., and when the dump truck is detached, the rear bumper etc. slightly floats, The rear bumper or the like does not interfere with the plate by being held in a collapsed state. As a result, there is an advantage that it is possible to prevent the plate from being damaged when the dump truck comes in contact with or leaves the dump truck.

  According to a third aspect of the present invention, the return mechanism includes a rotating portion that supports the plate so as to be tiltable via a support member, a spring means that always gives the plate a tendency to tilt forward, and the forward mechanism. Since it is provided with a stopper that restrains the inclination tendency and holds the plate in the above-mentioned standing state, the tendency to always lean forward given to the plate by the spring means is restricted by the stopper. The front end portion of the hopper can be reliably returned to the standing state. Further, the return mechanism is a simple mechanism including a rotating portion, a spring means, and a stopper, and has an advantage that the return function as described above can be realized.

  According to a fourth aspect of the present invention, the catch mechanism is attached to the support member in a direction opposite to the plate, and is latched to rotate forward when the plate is tilted backward, and the catch mechanism is rotated forward. A catch portion that receives the latch portion and elastically holds the latch portion, and is formed on the support member, and is erected in place of the plate when the plate falls backward, and when the dump truck is detached. A latch that pivots forward when the dump truck comes into contact with the dump truck because it includes a release section that abuts against the rear portion including the rear bumper of the dump truck and tilts forward and releases the latched state of the latch section by the catch section. By holding the portion elastically by the catch portion, it is possible to reliably hold the plate in a collapsed state. When the dump truck is detached, the release portion that has been erected in place of the plate tilts forward, so that the holding state of the latch portion by the catch portion can be reliably released. Furthermore, the catch mechanism is a simple mechanism including a latch portion, a catch portion, and a release portion, and has an advantage that functions such as holding and releasing the plate in a tilted state as described above can be realized.

  In the invention according to claim 5, since the plate is made of rubber, the impact imparted by the rear bumper or the like to the plate when the dump truck is in contact with the dump truck is mitigated by the flexibility imparted to the plate. There is an advantage that the breakage of the plate at the time of vehicle contact can be prevented more reliably.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a composite material spill prevention device for a paving machine according to the present invention will be described with reference to preferred embodiments. A hopper that accepts asphalt mixture input from the dump truck in order to achieve the purpose of reducing the cost when the dump truck touches and leaves the truck while satisfying the spill prevention function and further reduces the cost with a simple mechanism. An apparatus for preventing spillage of a pavement machine in which a rubber plate for preventing spillage of the received asphalt mixture is erected at a front end portion, a rotating part that supports the rubber plate in a tiltable manner, and the rubber This is realized by having spring means for always imparting a forward tilt tendency to the plate, and a stopper for restricting the forward tilt tendency and holding the rubber plate in an upright state.

  First, a first embodiment of the present invention will be described with reference to FIGS. Fig. 1 (a) is a side view of the main part of the composite material spill prevention device, (b) is a plan view of the stopper portion, (c) is a diagram showing the state of the rubber plate when the dump truck is in contact with the vehicle, and Fig. 2 is a plan view. It is a front view of a material spill prevention device. 5 that are the same as or equivalent to those in the prior art shown in FIG. 5 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1 and FIG. 2, the rubber plates 7 can be tilted only backward (to the right in FIG. 1 (a)) on both sides of the front end portion of the hopper 6 and are always in the standing state. It is attached with a tendency to return. The rubber plate 7 is attached only to both sides of the front end portion of the hopper 6 because the inclined portions 6a and 6a exist on both inner side surfaces of the hopper 6 and the asphalt composite material is formed on both sides of the front end portion of the hopper 6. This is because spillage is likely to occur.

  As shown in the figure, an angle-shaped support member 18 that supports the rubber plate 7 is rotatably attached to the front end portion position of the hopper 6 via a rotating portion 19. A coil spring 21 as a spring means is stretched between the other end of the support member 18 and a spring mounting member 20 fixed to the main body frame side of the paving machine 1. Further, the main body frame abuts against the other end of the support member 18, and the tendency of the support member 18 to rotate backward due to the elasticity of the coil spring 21, that is, the rubber plate 7 tilts forward. A stopper 22 for restricting the tendency is fixed.

  The rubber plate 7 can be tilted only rearward against the elasticity of the coil spring 21 by restricting the tendency of the rubber plate 7 to tilt forward by the stopper 22. A tendency to return to the standing state is given.

  Next, the operation of this embodiment will be described. As shown in FIGS. 1A and 1B, the rubber plate 7 is held in a standing state at the front end of the hopper 6 by the stopper 22 restricting the tendency to always tilt forward due to the elasticity of the coil spring 21. In addition, it can be tilted backward only against the elasticity of the coil spring 21.

  When the dump truck comes into contact with the hopper 6 to receive the asphalt composite material, the rear bumper 8 and the like of the dump truck abut against the rubber plate 7 as shown in FIG. At this time, the rubber plate 7 is pushed backward while being elastically in contact with the rear bumper or the like due to the flexibility of the rubber plate 7 itself and a tendency to tilt forward due to the elasticity of the coil spring 21. Thereby, the contact impact of the rear bumper 8 etc. with respect to this rubber plate 7 is relieved.

  When the rear bumper 8 and the like pass rearward, the rubber plate 7 returns to the standing state. Therefore, spillage of the asphalt mixture is prevented even while the asphalt mixture is being fed from the dump truck to the hopper 6.

  On the other hand, when the dump truck is detached, the rubber plate 7 is pushed forward while in contact with the rear bumper 8 and the like due to the flexibility of the rubber plate 7 itself. At this time, since the asphalt composite material as a load becomes almost empty in the dump truck, the rear bumper 8 and the like are lifted by this amount. For this reason, the interference force of the rear bumper 8 etc. with respect to the rubber plate 7 becomes small.

  When the dump truck leaves, the rubber plate 7 returns to the standing state, and the spilling of asphalt mixture from the hopper 6 is prevented. As described above, in the present embodiment, the rubber plate 7 is held upright at the front end portion of the hopper 6 so that the spill prevention function can be satisfied.

  When the dump truck is in contact with the vehicle, the rubber plate 7 is pushed backward while being elastically in contact with the rear bumper 8 or the like by the flexibility of the rubber plate 7 itself and the elasticity of the coil spring 21. When the dump truck is detached, it is pushed forward while being in contact with the rear bumper 8 or the like only by the flexibility of the rubber plate 7 itself, but the rear bumper 8 or the like is slightly lifted so that the interference force of the rear bumper 8 or the like with respect to the rubber plate 7 is increased. Becomes smaller. Therefore, it is possible to suppress damage to the rubber plate 7 when the dump truck touches and leaves, particularly damage to the rubber plate 7 when touching the dump truck.

  When the rear bumper 8 or the like passes rearward with respect to the rubber plate 7 when the dump truck is in contact with the vehicle, the rubber plate 7 returns to the standing state. Therefore, the spillage of the asphalt mixture can be prevented while the asphalt mixture is being fed from the dump truck to the hopper 6.

  The composite material spill prevention device of the present embodiment has a simple configuration including the rotating portion 19, the coil spring 21, and the stopper 22, and as described above, satisfies the function of preventing the spillage of asphalt composite material and touches the dump truck. The rubber plate can be prevented from being damaged at the time of detachment.

  In the present embodiment, the spring means is not limited to the coil spring, and a gas damper can also be used.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 3A is a side view of the main part of the composite material spill prevention device, FIG. 3B is a view showing a state where the rubber plate is tilted backward and held, and FIG. 3C is a view when the rubber plate is returned to the standing state. FIG. 4 is a front view of the composite material spill prevention device.

  As shown in FIGS. 3 and 4, the rubber plates 7 can be tilted only backward (to the right in FIG. 3A) on both sides of the front end portion of the hopper 6, and are always in the standing state. It is attached with a tendency to return. The rubber plate 7 is attached only to both sides of the front end portion of the hopper 6 because the inclined portions 6a and 6a exist on both inner side surfaces of the hopper 6 and the asphalt composite material is formed on both sides of the front end portion of the hopper 6. This is because spillage is likely to occur.

A mechanism for allowing the rubber plate 7 to tilt only backward and providing a tendency to return to the standing state will be described. A support member 9 that supports the rubber plate 7 is attached to the front end portion of the hopper 6 via a rotating portion 10 so as to be rotatable.

  A coil spring 12 as a spring means is stretched between one end 9a of the support member 9 and a spring mounting member 11 fixed to the main body frame side of the paving machine 1, and the support member is provided on the main body frame side. A stopper 13 is fixed so as to abut one end 9a of 9 and restrict the tendency of the support member 9 to rotate backward, that is, the tendency of the rubber plate 7 to tilt forward, due to the elasticity of the coil spring 12.

  The rubber plate 7 can be tilted only rearward against the elasticity of the coil spring 12 by restricting the tendency of the rubber plate 7 to tilt forward by the stopper 13, and the rotating portion 10 and the coil spring 12. The return mechanism 14 constituted by the stopper 13 gives a tendency to return to the standing state at all times.

  Further, in addition to the return mechanism 14, when the rubber plate 7 is brought into contact with the rear portion including the rear bumper of the dump truck and falls backward in addition to the return mechanism 14, A catch mechanism 15 having a function of holding the rubber plate 7 in a collapsed state is configured as follows.

  That is, on the lower surface side of the support member 9, when the rubber plate 7 falls backward, a latch portion 16 that rotates approximately 90 ° in the clockwise direction in FIG. The rubber plate 7 is attached in the opposite direction and facing downward. A catch portion 17 that receives the latch portion 16 and elastically holds the latch portion 16 is provided at a rotation position where the latch portion 16 is rotated approximately 90 ° in the clockwise direction.

  Further, the other end of the support member 9 forms a release portion 9b that releases the holding state of the latch portion 16 by the catch portion 17. When the rubber plate 7 falls backward, the release portion 9b rotates clockwise by approximately 90 ° and rises to a position where the rubber plate 7 is erected. It abuts against the rear part including the rear bumper of the truck and tilts forward to release the holding state of the latch part 16 by the catch part 17.

  Next, the operation of this embodiment will be described. As shown in FIG. 3A, the rubber plate 7 is always held in an upright state by the return mechanism 14 and can only be tilted rearward against the return tendency by the return mechanism 14. ing.

  When the dump truck comes into contact with the hopper 6 to receive the asphalt mixture, the rear bumper 8 of the dump truck contacts the rubber plate 7. At this time, due to the elasticity of the coil spring 12 and the flexibility imparted to the rubber plate 7 itself, the contact impact of the rear bumper 8 and the like against the rubber plate 7 is mitigated.

  As shown in FIG. 3 (b), when the rubber plate 7 is pushed backward due to the contact of the rear bumper 8 and the like, the latch portion 16 in the catch mechanism 15 rotates approximately 90 ° in the clockwise direction. The catch portion 17 is elastically held. As a result, the rubber plate 7 is held in a collapsed state while the asphalt composite material is accepted from the dump truck to the hopper 6. Then, the release portion 9b rises to the position where the rubber plate 7 was erected.

  The dump truck is detached when the asphalt mixture is completely charged into the hopper 6. At the time of separation, the asphalt composite material as the load becomes almost empty in the dump truck, and the rear bumper 8 and the like are lifted by the amount of the empty space. Therefore, when the dump truck is detached, the rear bumper 8 or the like does not interfere with the rubber plate 7 held in a collapsed state. Then, as shown in FIG. 3 (c), the release portion 9b, which has been set up in place of the plate, comes into contact with the rear bumper 8 of the dump truck and tilts forward, and the catch portion 17 The holding state of the latch unit 16 is released. By this release, the rubber plate 7 is returned to the standing state by the return mechanism 14 and the spilling of asphalt mixture from the hopper 6 is prevented.

  As described above, in the composite material spill prevention device for a paving machine according to the present embodiment, the rubber plate 7 is held upright at the front end portion of the hopper 6 so that the spill prevention function can be satisfied.

  When the dump truck is in contact with the dump truck, the rubber plate 7 falls backward while elastically contacting the rear bumper 8 and the like due to the flexibility of the rubber plate 7 itself and the elasticity of the coil spring 12. The contact impact of 8 etc. is relieved and the damage of the rubber plate 7 can be suppressed.

  When the dump truck is detached, the rear bumper 8 and the like of the dump truck are slightly lifted, and the rubber plate 7 is held in a state of being tilted backward, so that the rear bumper 8 and the like are held on the rubber plate 7. Does not interfere. Thereby, damage to the rubber plate 7 can be prevented.

  The return mechanism 14 has a simple configuration including the rotating portion 10, the coil spring 12, and the stopper 13, and can surely realize the return function of the rubber plate 7 to the normally standing state. In addition, the catch mechanism 15 has a simple configuration including the latch portion 16, the catch portion 17, and the release portion 9b, and can reliably realize functions such as holding the rubber plate 7 in a collapsed state and releasing the same. it can.

  In addition, the plate for preventing spillage in this embodiment is not limited to the rubber plate 7 having flexibility, but may be made of a hard material.

  Further, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the composite material spill prevention apparatus of the pavement machine which concerns on Example 1 of this invention, (a) is a side view, (b) is a figure which shows the state by which the rubber plate fell down and was hold | maintained, (c) FIG. 4 is a view showing a state where the rubber plate is returned to the standing state. The front view of the said Example 1. FIG. 5A and 5B are diagrams illustrating a second embodiment of the present invention, in which FIG. 5A is a side view, FIG. 5B is a plan view of a stopper portion, and FIG. 5C is a diagram illustrating a state of a rubber plate when the dump truck is in contact with a vehicle. The front view of the said Example 2. FIG. The side view of the composite material spill prevention apparatus of the conventional paving machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pavement machine 3 Dump truck 6 Hopper 7 Rubber plate 9, 18 Support member 9b Release part 10, 19 Rotating part 12, 21 Coil spring 13, 22 Stopper 14 Return mechanism 15 Catch mechanism 16 Latch part 17 Catch part

Claims (5)

A pavement spill prevention device for a pavement machine in which a rubber plate for preventing spillage of the received asphalt mixture is erected at the front end portion of a hopper that receives asphalt mixture input from a dump truck,
A rotating portion that supports the rubber plate in a tiltable manner, a spring means that always gives the rubber plate a tendency to tilt forward, and the rubber plate is held in an upright state by restricting the tendency to tilt forward. A plywood spillage prevention device characterized by having a stopper. A pavement spill prevention device for a pavement machine in which a plate for preventing spillage of the received asphalt mixture is erected at the front end of a hopper that receives asphalt mixture input from a dump truck,
A return mechanism that gives a tendency to always return to the standing state with respect to the plate that can be tilted backward, and the plate comes into contact with the rear part including the rear bumper of the dump truck when the dump truck comes in contact with the plate. And a catch mechanism that holds the state where the plate has fallen against the return tendency and is released when the dump truck is detached. Spill prevention device.   The return mechanism includes a rotating part that supports the plate via a support member so as to be tiltable, a spring means that always imparts a forward tilting tendency to the plate, and restricts the forward tilting tendency of the plate. The apparatus for preventing spilling of a composite material for a paving machine according to claim 2, further comprising a stopper for holding the slab in the standing state.   The catch mechanism is attached to the support member in a direction opposite to the plate, and latches to rotate forward when the plate is tilted backward, and receives the latch portion rotated forward, and receives the latch portion. A catch portion for elastically holding the rear portion of the dump truck, including a rear bumper, which is formed on the support member and is erected in place of the plate when the plate falls backward. 4. The composite material spill prevention device for a pavement machine according to claim 2, further comprising: a release portion that contacts and tilts forward and releases the holding state of the latch portion by the catch portion. 5. The apparatus for preventing spilling of a composite material for a paving machine according to claim 2, wherein the plate is made of rubber.

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