JP4478655B2 - Snow removal attachment for construction machinery - Google Patents

Description

  The present invention relates to a snow removal attachment for a construction machine that is attached to an arm of the construction machine.

  A dedicated snowplow is used for snow removal on the road, and snow removal on the roof is usually done manually. However, many dedicated snow plows are not suitable for removing snow on narrow or winding roads, and manual snow removal of the roof has caused great labor and danger. Thus, as seen in Patent Document 1 and Patent Document 2, for example, snow removal attachments that are attached to the arms of construction machines have been proposed. The snow removal attachment can freely change the position and direction of the attachment body by the horizontal turning of the turning body having the driver's seat and the bending of the boom, arm and attachment body with respect to the turning body. Snow removal with a high degree of freedom is possible.

  Patent Document 1 discloses a snow removal attachment composed of an auger that scrapes snow, a blower that sucks in the snow swept by the auger, and a shooter that releases the snow sucked by the blower (tip-side snow throwing cylinder) (See claim 1 and FIG. 6). The auger is rotated by a hydraulic motor that uses an oil source included in the construction machine. The shooter can be turned horizontally independently of the rotation of the auger by a snow tube rotation motor provided in the auger case. Also, there is an advantage that the snow on the roof can be removed by the snow removal attachment by lifting the arm of the construction machine. Patent Document 2 is substantially the same as Patent Document 1.

Japanese Patent Publication No. 04-015332 (see page 4, column 8, lines 30 to 37) JP 2005-336898 A (refer to claim 1 and paragraph 0007)

  The snow removal attachment for construction machines can be easily downsized because the auger can be rotated using the hydraulic power source provided by the construction machine, but it also has a high degree of freedom to freely change the position and orientation of the attachment body. Has the greatest advantage. However, the greatest advantage is that there is a problem that the orientation of the shooter has to be changed complicatedly in accordance with the position and direction of the attachment main body, the snow removal place, and the like. In this regard, Patent Document 1 changes the direction by horizontally turning the shooter independently of the rotation of the auger by the snow throwing cylinder rotating motor provided in the auger case.

  Certainly, it is an advantage that the shooter can be turned horizontally independently of the rotation of the auger. However, if the snow thrower rotation motor is a hydraulic motor, two systems of hydraulic piping are required for rotating the auger and horizontally rotating the shooter. This means that when using a snow removal attachment as needed, while usually using it as a normal construction machine, it means that there must be two systems of hydraulic piping to the arm tip, and the snow removal attachment is attached. This is a disadvantage that limits the construction machines that can be used. Since the snow removal attachment of Patent Document 2 further uses a sprocket motor for adjusting the position of the blower, if the sprocket motor is a hydraulic motor, more hydraulic piping is required. Therefore, in order to reduce the number of hydraulic piping prepared on the arm side as a snow removal attachment for construction machinery, the connection configuration of the arm feed piping and return piping with the main hydraulic motor and sub hydraulic motor was examined.

  What was developed as a result of the study was that the auger and blower were housed in the main body case mounted on the arm of the construction machine, and a snow remover for the construction machine in which a shooter for specifying the direction of snow discharge from the main body case was attached to the main body case In the attachment, the main hydraulic motor that drives the auger and blower, the auxiliary hydraulic motor that horizontally rotates the shooter, and the feed pipe and return pipe of the arm are connected, and only the main hydraulic motor is driven by the oil sent from the feed pipe. A snow removal attachment for a construction machine, comprising a selection circuit that drives only the auxiliary hydraulic motor by oil sent from the return pipe.

  The snow removal attachment of the present invention utilizes the fact that there are two cases: when oil is sent from the arm feed pipe and returned through the return pipe, and conversely when oil is sent from the return pipe and returned through the feed pipe. The drive of the main hydraulic motor and the sub hydraulic motor is selectively switched by the selection circuit. That is, in the snow removal attachment of the present invention, when oil flows from the feed pipe, only the main hydraulic motor is driven and the sub hydraulic motor is stopped, so that the direction of snow discharge by the shooter is fixed and the auger and blower are fixed. Use to remove snow. Conversely, when oil is sent from the return pipe, only the sub hydraulic motor is driven and the main hydraulic motor is stopped, so that the shooter can be turned horizontally in a safe state where the auger and blower are stopped. You can change the direction of snow release.

  Here, “feed pipe” and “return pipe” are names when hydraulic pipes are distinguished based on the flow of oil based on one of them, and the present invention itself is applied even if the feed pipe and the return pipe are reversed. unrelated. That is, if the oil sent from the construction machine can selectively drive the main hydraulic motor or the sub hydraulic motor depending on which of the pair of hydraulic pipes (which corresponds to the feed pipe and the return pipe) flows into the snow removal attachment, This corresponds to the selection circuit of the present invention. A normal construction machine has an operation mechanism for switching whether to feed oil from a feed pipe or a return pipe. The present invention can selectively operate the driving of the auger and blower and the horizontal turning of the shooter by using the operation mechanism by adding a selection circuit.

  The specific selection circuit consists of connecting the main connection feed pipe connected to the main hydraulic motor and the sub connection return pipe connected to the sub hydraulic motor to the feed pipe of the arm, and connecting the main connection return pipe and sub hydraulic motor connected to the main hydraulic motor. Connect the connected sub-connection feed pipe to the return pipe of the arm and allow the oil to flow out from the main connection return pipe, and conversely check the main connection return pipe to prevent the oil from flowing into the main connection return pipe. A check valve may be provided in the sub-connection return pipe that allows the oil to flow out from the sub-connection return pipe, and conversely prevents oil from flowing into the sub-connection return pipe. Actually, instead of directly connecting the arm feed pipe and return pipe to the main connection feed pipe, main connection return pipe, sub connection feed pipe and sub connection return pipe, the main connection is made from the branch feed pipe connected to the feed pipe. A structure is used in which the feed pipe and the sub-connection return pipe are branched, and the sub-connection feed pipe and the main connection return pipe are branched from the branch return pipe connected to the return pipe.

  The specific selection circuit includes a check valve provided in the main connection return pipe and the sub return pipe to prevent the oil from flowing in from the oil return side, respectively, and the main connection feed pipe to the main hydraulic motor and the sub hydraulic motor. Allow oil to flow only from the sub-connection feed pipe. As a result, when oil is poured from the feed pipe of the arm, the oil does not flow into the sub-connection return pipe that is prevented from flowing into the check valve, but can be poured only into the main hydraulic motor through the main connection feed pipe. . Further, when oil is poured from the return pipe of the arm, the oil does not flow into the main connection return pipe where the oil is prevented from flowing into the check valve, and the oil can be poured only into the sub hydraulic motor through the sub connection feed pipe. Thus, the snow removal attachment of the present invention switches the driving of the main hydraulic motor and the sub hydraulic motor.

  Since the main hydraulic motor rotates the auger and the blower at a high speed, it is dangerous to stop the oil hydraulic pump immediately after the oil flow is stopped. Therefore, the selection circuit connects the main connection feed pipe and main connection return pipe connected to the main hydraulic motor with a circulation pipe, and allows oil to flow from the main connection return pipe to the main connection feed pipe, and conversely the main connection feed pipe. A check valve for preventing oil from flowing from the main connection return pipe to the main connection return pipe may be provided in the circulation pipe.

  This selection circuit constitutes a circuit that connects the main connection feed pipe, main hydraulic motor, main connection return pipe, and circulation pipe. After the oil flowing from the main connection feed pipe stops, the main connection return is performed by the rotation of the main hydraulic motor. The oil that flows into the pipe is returned from the circulation pipe to the main connection feed pipe so that the main hydraulic motor does not stop suddenly. Here, when oil flows from the arm feed pipe to the main connection feed pipe and the main hydraulic motor is rotating, it seems that oil flows from the main connection return pipe to the check valve of the circulation pipe. The valve is closed because the pressure of oil flowing from the arm feed pipe is applied, and there is no possibility that oil flows from the main connection return pipe to the main connection feed pipe through the circulation pipe.

  Unlike the main hydraulic motor described above, the auxiliary hydraulic motor is meaningless if it cannot be stopped immediately when the oil flow is stopped, for the purpose of changing the direction of the shooter and specifying the snow discharge direction. Therefore, the selection circuit interposes a counter balance valve in the secondary connection return pipe connected to the secondary hydraulic motor, and when the oil starts flowing from the return pipe of the arm to the secondary connection feed pipe, the secondary connection return in which the counter balance valve intervenes. When the pipe is made conductive and the flow of oil from the return pipe of the arm to the secondary connection feed pipe stops, the secondary connection return pipe interposing the counter balance valve may be shut off.

  This selection circuit interposes a counter balance valve in the sub-connection feed pipe in order to make rotation and stop of the sub-hydraulic motor correspond to the flow and stop of oil. Also in this case, the operating pressure of the counter balance valve is taken from the sub-connection feed pipe. This allows the counterbalance valve to move to the operating position as long as oil is being sent from the arm return pipe to the sub-connection feed pipe, allowing the sub-connection return pipe to conduct, allowing oil to flow out of the sub-hydraulic motor, The auxiliary hydraulic motor is driven, but when the oil flow from the return pipe of the arm stops, the counter balance valve immediately returns to its original position, and the auxiliary hydraulic motor stops flowing by shutting off the auxiliary connection return pipe. The sub hydraulic motor can be immediately stopped.

  The snow removal attachment of the present invention selectively drives the main hydraulic motor that drives the auger and blower and the sub hydraulic motor that horizontally rotates the shooter depending on whether the oil flows through the feed pipe or return pipe of the arm. There is an advantage that less hydraulic piping is required on the arm side. Thereby, the effect that the snow removal attachment of this invention can be mounted | worn with almost all construction machines is acquired. This brings versatility to the snow removal attachment of the present invention. In this way, the snow removal attachment that can be attached to the arm of the construction machine has the advantages of removing snow at a place where it was difficult to remove snow with a conventional snow remover, etc., as well as the same type of attachment, and facilitating snow removal on the roof.

  In particular, the fact that snow can be snowed on a roof, which is a work at high altitude, with a machine, regardless of human power, is a great effect. Moreover, even during snow removal work, there is an advantage that the shooter can be swiveled horizontally using the operation mechanism of the construction machine and the direction of snow discharge can be easily changed. Compared to conventional snow removal work more efficiently, including snow disposal. Can be realized. As described above, the snow removal attachment according to the present invention has a great effect in that a more flexible and free snow removal operation is realized by realizing the horizontal turning of the shooter by the operation of the construction machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an example of a snow removal attachment 1 to which the present invention is applied, FIG. 2 is a side view of the snow removal attachment 1 of this example, and FIG. 3 is a view along arrow A in FIG. It is. The snow removal attachment 1 shown in this example is similar in appearance and configuration to a conventionally known similar attachment because the use purpose and specification mode are similar, but the selection circuit 2 according to the present invention (see FIGS. 14), the drive source for rotating the auger 12 and the blower and the drive source for horizontally turning the shooter 14 are both hydraulic motors, and the main hydraulic motor 13 and the sub hydraulic motor 15 are construction machines. It is characterized in that it is alternatively driven by the operation mechanism 3.

  As shown in FIGS. 1 to 3, the snow removal attachment 1 of the present example is provided with an auger 12 having a rotation axis parallel to the extending direction of the opening in a body case 11 having a front face opened in a rectangular shape when viewed from the front. A blower (not shown) is provided on the back surface of the auger 12 to discharge the snow scraped by the auger 12 out of the main body case 11 from the shooter 14. Since the auger 12 and the blower cooperate to scrape and release snow, the rotational power output from the main hydraulic motor 13 is branched to rotate the auger 12 and the blower simultaneously. In this example, the main hydraulic motor 13 is fixed to the upper surface of the main body case 11, and the auger 12 in the main body case 11 is connected via a transmission mechanism (not shown) housed in a cover 131 provided on the side surface of the main body case 11. The rotary power of the main hydraulic motor 13 is branched and transmitted to each of the blowers. The main hydraulic motor 13 is connected to a main connection feed pipe 23 and a main connection return pipe 24 of the selection circuit 2 described later.

  The shooter 14 is attached to the upper surface of the main body case 11 that is directly above the direction in which the snow is discharged by the blower so as to be able to turn horizontally. The shooter 14 of this example has a driven sprocket 141 that is coaxial with the horizontal swivel axis of the shooter 14 attached to the base attached to the main body case 11, and the output shaft of the auxiliary hydraulic motor 15 fixed to the upper surface of the main body case 11. Are connected by a drive sprocket 151 and a transmission chain 16.

  As a result, a space is formed between the output shaft of the auxiliary hydraulic motor 15 and the shooter 14 to reduce the possibility that frozen snow, mud, pebbles, etc. bite the output shaft, the drive sprocket 151 or the driven sprocket 141. At the same time, frozen snow, mud, pebbles, etc. that are bitten by the drive sprocket 151 or the driven sprocket 141 are discharged by the transmission chain 16 or the transmission belt, thereby preventing the sub hydraulic motor 15 or the shooter 14 from being damaged. Preferably, the drive sprocket 151, the driven sprocket 141, and the transmission chain 16 are integrally covered so as to suppress the biting of such frozen snow, mud, pebbles and the like.

  As means for transmitting the rotational power of the auxiliary output shaft to the shooter 14, a transmission belt mechanism can be used instead of the transmission chain 16 mechanism. In particular. A driven pulley is attached coaxially with the horizontal turning shaft of the shooter 14, and the driving pulley attached to the output shaft of the auxiliary hydraulic motor 15 provided in the main body case 11 and the driven pulley are connected by a transmission belt. The transmission chain mechanism and the transmission belt mechanism reduce the rotational speed of the sub-hydraulic motor 15 according to the gear ratio of the drive sprocket 151 and the driven sprocket 141 and the gear ratio of the drive pulley and the driven pulley, and slowly move the shooter 14 It can be swiveled horizontally.

  Further, a driven gear is mounted coaxially with the horizontal turning shaft of the shooter 14, and the drive gear attached to the output shaft of the auxiliary hydraulic motor 15 provided in the main body case 11 and the driven gear are connected by an intermediate transmission gear. A mechanism may be used. This transmission gear mechanism becomes a speed reduction mechanism, which makes it easy to reduce the rotational power with a gear ratio determined by the engagement of the drive gear, the transmission gear, and the driven gear. For example, by replacing the transmission gear (so-called gear change), It is also possible to increase or decrease the horizontal turning.

  The snow removal attachment 1 of this example is attached to the arm 31 by pivotally connecting the tips of the arms 31 of the construction machine 3 to a pair of mounting flanges 111 protruding from the back surface of the main body case 11. The snow removal attachment 1 of this example can change the posture in the front-rear direction with respect to the arm 31 by connecting the tip of a rod of a hydraulic cylinder attached to the arm 31 so as to be swingable to the mounting flange 111. Further, since the arm 31 is bendable with respect to the construction machine 3 via the boom 32, the snow removal attachment 1 can be lifted in the height direction by the bending of the arm 31 and the boom 32. Further, the snow removal attachment 1 can be turned in the left-right direction according to the horizontal turning of the construction machine 3 that supports the arm 31. Thus, the snow removal attachment 1 of this example can freely change the posture, height, and direction.

  4 is a circuit diagram showing an example of the selection circuit 2 provided in the snow removal attachment 1 of the present invention, FIG. 5 is a circuit diagram showing the selection circuit 2 in a state where the main hydraulic motor 13 is driven by the selection circuit 2, and FIG. FIG. 7 is a circuit diagram showing the selection circuit 2 in a state in which the main hydraulic motor 13 is stopped. FIG. 8 is a selection circuit 2 in a state in which the sub hydraulic motor 15 is stopped. FIG. 9 is a circuit diagram showing the selection circuit 2 in a state in which the main hydraulic motor 13 is protected from excessive pressure. FIG. 10 is a selection circuit 2 in a state in which the main hydraulic motor 13 rotates to the right when an external force F is applied. FIG. 11 is a circuit diagram showing the selection circuit 2 in a state where the external hydraulic force F is applied and the main hydraulic motor 13 rotates counterclockwise. FIG. 12 is a selection circuit 2 in a state where the auxiliary hydraulic motor 15 is protected from excessive pressure. FIG. 13 is a circuit diagram showing the auxiliary hydraulic motor 15 when an external force F is applied. A circuit diagram representing the selection circuit 2 with the right rotation, and FIG. 14 is a circuit diagram showing a selection circuit 2 in the state which applied external force F auxiliary hydraulic motor 15 is rotated counterclockwise. 5 to 7 and FIGS. 9 to 14 show the oil flow with a thick solid line, and FIG. 8 shows the oil to be stopped with a thick solid line.

  As shown in FIG. 4, the selection circuit 2 of the present invention has a branch feed pipe 21 connected to the feed pipe 311 of the arm 31 and a branch return pipe 22 connected to the return pipe 312 of the arm 31. The main connection feed pipe 23 branched from the pipe 21 and the main connection return pipe 24 branched from the branch return pipe 22 are connected to the main hydraulic motor 13, and the sub connection return pipe 26 branched from the branch return pipe 22 and the above A sub-connection feed pipe 25 branched from the branch feed pipe 21 is connected to the sub-hydraulic motor 15. As a result, the snow removal attachment 1 simply connects the branch feed pipe 21 and the branch return pipe 22 to the feed pipe 311 and the return pipe 312 of the arm 31, and connects the main connection feed pipe 23 and the sub-feed pipe 23. The connection return pipe 26 can be branched, and the main connection return pipe 24 and the sub-connection feed pipe 25 can be branched from the return pipe 312 of the arm 31. Although not shown in FIGS. 1 to 3 for convenience of explanation, the various pipes and valves are attached to the main body case 11, the main hydraulic motor 13, or the sub hydraulic motor 15 of the snow removal attachment 1 illustrated above, Stored between mounting flanges 111.

  The selection circuit 2 of this example is provided with a check valve 241 on the main connection return pipe 24 that allows oil to flow out from the main connection return pipe 24 and conversely prevents oil from flowing into the main connection return pipe 24, and A check valve 261 that allows oil to flow out from the sub-connection return pipe 26 and conversely prevents oil from flowing into the sub-connection return pipe 26 is provided in the sub-connection return pipe 26. As a result, as shown in FIG. 5, the oil flowing from the feed pipe 311 of the arm 31 drives the main hydraulic motor 13 from the branch feed pipe 21 through the main connection feed pipe 23 (shown by right rotation in FIG. 5). However, the check valve 261 prevents the oil from flowing into the sub-connection return pipe 26 and does not reach the sub-hydraulic motor 15. Here, since the direction of the oil fed to the main hydraulic motor 13 is specified, the main hydraulic motor 13 may be a one-way rotation type. However, since it is preferable that the main hydraulic motor 13 can rotate in either the left or right direction when receiving the external force F, this example uses the bi-directionally rotating main hydraulic motor 13 and the oil flow is selected by the selection circuit 2. It is reliably controlled.

  Similarly, as seen in FIG. 6, the oil flowing from the return pipe 312 of the arm 31 flows from the branch return pipe 22 to the sub-connection feed pipe 25 and the check valve 271 interposed in parallel with the counter balance valve 27 described later. After that, the auxiliary hydraulic motor 15 is driven (illustrated by right rotation in FIG. 6), but the check valve 241 prevents the oil from flowing into the main connection return pipe 24 and does not reach the main hydraulic motor 13. Here, like the main hydraulic motor 13 described above, since the direction of the oil fed to the sub hydraulic motor 15 is specified, the sub hydraulic motor 15 may be a one-way rotation type. However, since it is preferable that the auxiliary hydraulic motor 15 can rotate in either the left or right direction when receiving the external force F, this example uses the bi-directionally rotating auxiliary hydraulic motor 15 and the oil flow is selected by the selection circuit 2. It is reliably controlled.

  Thus, the selection circuit 2 of this example can switch the driving of the main hydraulic motor 13 and the sub hydraulic motor 15 according to the operation mechanism (not shown) of the construction machine 3. Here, since the rotation speed of the main hydraulic motor 13 and the sub hydraulic motor 15 can be adjusted by the flow rate of the flowing oil, the selection circuit 2 of this example flows into the main hydraulic motor 13 or the sub hydraulic motor 15 in the middle of reaching each. There are provided throttle valves 211 and 251 for adjusting the flow rate. A throttle valve 211 for adjusting the rotational speed of the main hydraulic motor 13 is provided in the branch feed pipe 21. Since this branch feed pipe 21 flows in the direction in which the oil returns when the sub hydraulic motor 15 is driven, the check valve 212 that conducts in the oil return direction is connected to the throttle valve 211 so as not to hinder the oil flow in the return direction. It is provided in parallel. A throttle valve 251 for adjusting the rotation speed of the sub hydraulic motor 15 is provided in the sub connection feed pipe 25.

  In the selection circuit 2 used in the present invention, if only the main hydraulic motor 13 and the sub hydraulic motor 15 are switched, only the check valves 241 and 261 described above may be provided in the main connection return pipe 24 and the sub connection return pipe 26, respectively. However, the selection circuit 2 including only the check valves 241 and 261 is configured so that the main hydraulic motor 13 or the sub hydraulic motor 15 is stopped by the actual oil flow state, and when the external force F is applied, the main hydraulic motor 13 The behavior of 13 or the sub hydraulic motor 15 is unclear and is not practical enough. Therefore, the selection circuit 2 of this example protects the main hydraulic motor 13 from the check valve 243 for naturally stopping the main hydraulic motor 13, the counter balance valve 27 for immediately stopping the auxiliary hydraulic motor 15, and the external force F. The relief valve 232 and the relief valves 253 and 263 for protecting the auxiliary hydraulic motor 15 from the external force F are respectively added.

  Since the main hydraulic motor 13 rotates the auger 12 and the blower at a high speed, it is dangerous to stop the oil immediately after the oil flow is stopped. It is preferable. Therefore, as shown in FIG. 7, the selection circuit 2 of this example connects the main connection feed pipe 23 and the main connection return pipe 24 connected to the main hydraulic motor 13 by the circulation pipe 242, and the main connection return pipe 24 connects the main connection return pipe 24. The circulation pipe 242 is provided with a check valve 243 that allows oil to flow to the connection feed pipe 23 and conversely prevents oil from flowing from the main connection feed pipe 23 to the main connection return pipe 24.

  The selection circuit 2 provided with the circulation pipe 242 constitutes a circulation circuit connecting the main connection feed pipe 23, the main hydraulic motor 13, the main connection return pipe 24, and the circulation pipe 242, and the main connection feed from the feed pipe 311 of the arm 31. After the oil flowing into the pipe 23 stops, the oil that tries to flow from the main connection return pipe 24 to the return pipe 312 of the arm 31 by the rotation of the main hydraulic motor 13 is returned from the circulation pipe 242 to the main connection feed pipe 23, The main hydraulic motor 13 is not suddenly stopped. Here, when oil flows from the feed pipe 311 of the arm 31 to the main connection feed pipe 23 and the main hydraulic motor 13 rotates, the oil flows from the main connection return pipe 24 to the check valve 243 of the circulation pipe 242. It seems that the check valve 243 is closed because the pressure of oil flowing from the feed pipe 311 of the arm 31 is applied, and oil flows from the main connection return pipe 24 to the main connection feed pipe 23 through the circulation pipe 242. There is no fear.

  Unlike the main hydraulic motor 13 described above, the auxiliary hydraulic motor 15 makes no sense if it cannot be stopped immediately when the oil flow is stopped, in order to change the direction of the shooter 14 and specify the direction of snow discharge. Absent. Therefore, as shown in FIG. 8, the selection circuit 2 of this example is interposed in both the sub-connection feed pipe 25 and the sub-connection return pipe 26 connected to the sub-hydraulic motor 15, and the oil flowing through the sub-connection feed pipe 25. Is provided with a counter balance valve 27 that switches from a shut-off state to a conducting state using the above pressure as an operating pressure (pilot pressure).

  In this selection circuit 2, when oil starts to flow from the return pipe 312 of the arm 31 into the sub-connection feed pipe 25, the oil is fed into the sub-hydraulic motor 15 through the check valve 271 interposed in parallel with the counter balance valve 27. At the same time, the secondary connection return pipe 26 in which the counter balance valve 27 is interposed is conducted, and the oil returning from the secondary hydraulic motor 15 is returned to the feed pipe 311 of the arm 31. However, when the oil flow from the return pipe 312 of the arm 31 to the sub-connection feed pipe 25 stops, the sub-connection return pipe 26 where the counter balance valve 27 is interposed is shut off to prevent oil from flowing out of the sub-hydraulic motor 15. As a result, the flow of oil from the sub-connection feed pipe 25 to the sub-hydraulic motor 15 is stopped.

  Since the selection circuit 2 including the counter balance valve 27 takes the operating pressure of the counter balance valve 27 from the sub-connection feed pipe 25, oil is fed from the return pipe 312 of the arm 31 to the sub-connection feed pipe 25. As long as the counter balance valve 27 is switched, the secondary connection return pipe 26 is conducted, and the oil can flow into the secondary hydraulic motor 15 through the check valve 271. However, as soon as the oil flow from the return pipe 312 of the arm 31 stops, the counter balance valve 27 stops operating, and the secondary connection return pipe 26 is shut off so that no oil flows to the secondary hydraulic motor 15 and The hydraulic motor 15 can be stopped immediately. Thereby, the direction of the shooter 14 can be accurately specified by the operation by the operation mechanism of the construction machine 3.

  Next, in order to protect the main hydraulic motor 13 from excessive oil pressure, as shown in FIG. 9, the main connection feed pipe 23 and the main connection return pipe 24 connected to the main hydraulic motor 13 are connected by a bypass pipe 231. If the pressure of the oil flowing from the main connection feed pipe 23 to the main hydraulic motor 13 is equal to or lower than the specified pressure resistance of the main hydraulic motor 13, the bypass pipe 231 is shut off and the oil flowing from the main connection feed pipe 23 to the main hydraulic motor 13 is blocked. A relief valve 232 that conducts the bypass pipe 231 when the pressure exceeds the specified pressure resistance of the main hydraulic motor 13 may be provided in the bypass pipe 231. The relief valve 232 uses the pressure of the oil flowing through the main connection feed pipe 23 as an operating pressure, and conducts when the oil pressure exceeds the specified pressure resistance of the main hydraulic motor 13, and releases the pressure to the bypass pipe 231. This protects the main hydraulic motor 13 from excessive oil pressure. In this example, the relief valve 232 that protects the main hydraulic motor 13 from excessive oil pressure is also used to protect the main hydraulic motor 13 described later from an external force F.

  In order to protect the main hydraulic motor 13 from the external force F, it is preferable that the main hydraulic motor 13 can naturally rotate by the applied external force F. For this reason, the main connection feed pipe 23 and the main connection return pipe 24 connected to the main hydraulic motor 13 are connected to the selection circuit 2 by a bypass pipe so that the main hydraulic motor 13 does not rotate even when the auger 12 receives an external force F. For example, if the bypass pipe is shut off and the auger 12 receives the external force F and the main hydraulic motor 13 rotates, the pressure of the oil flowing from the main hydraulic motor 13 into either the main connection feed pipe 23 or the main connection return pipe 24 It is preferable to provide a relief valve in the bypass pipe that conducts the bypass pipe in response. In this case, a relief valve that allows oil to flow from the main connection feed pipe 23 toward the main connection return pipe 24 and a relief that allows oil to flow from the main connection return pipe 24 toward the main connection feed pipe 23 with respect to the two bypass pipes Each valve is preferably provided.

  Here, as described above, the selection circuit 2 of this example already has one circulation pipe 242 and one bypass pipe 231 connecting the main connection feed pipe 23 and the main connection return pipe 24, and each of them has an oil flow. A check valve 243 and a relief valve 232 having different directions are provided. Therefore, in this example, the main hydraulic motor 13 is protected from the external force F by using the circulation pipe 242 provided with the check valve 243 and the bypass pipe 231 provided with the relief valve 232.

  Specifically, when the main hydraulic motor 13 tries to rotate clockwise by the applied external force F, as shown in FIG. Oil is allowed to flow through a circulation circuit including the connection return pipe 24, the circulation pipe 242 and the main connection feed pipe 23. As a result, the main hydraulic motor 13 can naturally rotate by the applied external force F. Further, when the main hydraulic motor 13 tries to rotate counterclockwise due to the applied external force F, as shown in FIG. 11, the main hydraulic motor 13 and the main connection feed pipe are utilized by using the bypass pipe 231 provided with the relief valve 232. 23. Oil is allowed to flow through a circulation circuit including the bypass pipe 231 and the main connection return pipe 24.

  The selection circuit 2 that protects the sub hydraulic motor 15 from excessive oil pressure connects the sub connection feed pipe 25 and the sub connection return pipe 26 connected to the sub hydraulic motor 15 by the bypass pipe 252, If the pressure of the oil flowing into the motor 15 is less than the specified pressure resistance of the sub hydraulic motor 15, the bypass pipe 252 is shut off, and the pressure of the oil flowing into the sub hydraulic motor 15 from the sub connecting feed pipe 25 is the specification of the sub hydraulic motor 15. A relief valve 253 that conducts the bypass pipe 252 when the pressure resistance is exceeded is provided in the bypass pipe 252.

  In this case, one bypass pipe 252 is provided, and the relief valve 253 is configured to flow oil from the sub-connection feed pipe 25 to the sub-connection return pipe 26 using the pressure of oil flowing through the sub-connection feed pipe 25 as an operating pressure. . As a result, as shown in FIG. 12, the relief valve 253 conducts when the pressure of the oil flowing through the sub-connection feed pipe 25 exceeds the specified pressure resistance of the sub-hydraulic motor 15, and releases the pressure to the bypass pipe 252. Thus, the auxiliary hydraulic motor 15 can be protected from excessive oil pressure.

  The selection circuit 2 for protecting the auxiliary hydraulic motor 15 from the external force F connects the auxiliary connection feed pipe 25 and the auxiliary connection return pipe 26 connected to the auxiliary hydraulic motor 15 by the bypass pipes 252 and 262, and the shooter 14 receives the external force F. If the auxiliary hydraulic motor 15 does not rotate, the bypass pipes 252 and 262 are blocked, and if the shooter 14 receives the external force F and the auxiliary hydraulic motor 15 rotates, the auxiliary hydraulic motor 15 rotates to the auxiliary connection feed pipe 25 or the auxiliary connection return pipe. Relief valves 253 and 263 that are connected to the bypass pipes 252 and 262 under the pressure of oil flowing into one of the pipes 26 are provided in the bypass pipes 252 and 262. In this case, a relief valve 253 for flowing oil from the sub-connection feed pipe 25 to the sub-connection return pipe 26 and oil from the sub-connection return pipe 26 to the sub-connection feed pipe 25 are supplied to the two bypass pipes 252 and 262. It is preferable to provide a relief valve 263 for flowing.

  Here, in order to protect the sub hydraulic motor 15 from excessive oil pressure, the selection circuit 2 of this example has already provided one bypass pipe 252 connecting the sub connection feed pipe 25 and the sub connection return pipe 26, and the bypass pipe Since the relief valve 253 is provided at 252, in order to protect the auxiliary hydraulic motor 15 from the external force F, the remaining one bypass pipe 262 is provided, and the bypass pipe 262 faces away from the relief valve 253. What is necessary is just to provide the relief valve 263 which lets oil flow into.

  Thus, when the auxiliary hydraulic motor 15 tries to rotate clockwise by the applied external force F, a relief valve 263 is provided to flow oil from the auxiliary connection return pipe 26 toward the auxiliary connection feed pipe 25 as shown in FIG. By using the bypass piping 262, oil is circulated in a circulation circuit composed of the secondary hydraulic motor 15, the secondary connection return piping 26, the bypass piping 262, and the secondary connection feed piping 25, and the external hydraulic motor 15 is driven by the applied external force F. Rotate naturally. In addition, when the auxiliary hydraulic motor 15 tries to rotate counterclockwise by the applied external force F, a relief valve 253 is provided to flow oil from the auxiliary connection feed pipe 25 toward the auxiliary connection return pipe 26 as shown in FIG. By using the bypass piping 252, oil is circulated in a circulation circuit including the secondary hydraulic motor 15, the secondary connection feed piping 25, the bypass piping 252 and the secondary connection return piping 26, and the secondary hydraulic motor 15 is naturally caused by the applied external force F. Rotate.

  FIG. 15 is a side view showing the snow removal work by the construction machine 3 to which the snow removal attachment 1 of this example is attached, and FIG. 16 shows the start state of snow removal of the roof 41 by the construction machine 3 to which the snow removal attachment 1 of this example is attached. 17 is a side view, and FIG. 17 is a side view showing a state where the snow 41 of the roof 41 by the construction machine 3 to which the snow removal attachment 1 of the present example is mounted is finished snowing.

  The snow removal attachment 1 of the present invention simply switches the driven main hydraulic motor 13 or sub hydraulic motor 15 depending on whether the oil is fed from the feed pipe 311 or the return pipe 312 of the arm 31 by the operation mechanism of the construction machine 3. Equipped with convenience that can That is, when oil is sent from the feed pipe 311 of the arm 31, only the main hydraulic motor 13 is driven and the sub hydraulic motor 15 is stopped, so that the direction of snow discharge by the shooter 14 is fixed and the auger 12 and Snow can be removed using a blower, and when oil is sent from the return pipe 312, only the auxiliary hydraulic motor 15 is driven and the main hydraulic motor 13 is stopped, so that the auger 12 and the blower are stopped. The shooter 14 can be turned horizontally to change the direction of the snow S discharge.

  Furthermore, since the snow removal attachment 1 of the present invention is attached to the tip of the boom 32 and the arm 31 extending from the turning body 33 of the construction machine 3 that turns horizontally, the left and right directions are changed according to the horizontal turning of the turning body 33, and the boom 32. In addition, since the height can be adjusted according to the bent state of the arm 31 and the posture with respect to the arm 31 can be changed, it is possible to remove snow and remove snow, which is not seen conventionally, unlike a dedicated snow remover. For example, as shown in FIG. 15, the snow removal attachment 1 is lowered from the upper side of the snow S mountain or wall that has already been piled up, and snow removal is started. The snow S removed from the snow can be discharged. That is, the mountain or wall of the snow S, which is difficult with a dedicated snow remover, can be moved toward the back.

  In addition, the scene where the snow removal attachment 1 of the present invention can be most effectively used is a scene where the roof 41 is snowed. In the conventional snow removal, an operator climbs on the roof 41 and scratches the snow S accumulated in order from the ridge toward the eaves to drop it on the ground. This has a risk that the worker falls or there is a risk that the snow S dropped from the roof 41 hits a human on the ground, and eventually the snow S is only stacked around the house 4. On the other hand, when the snow removal attachment 1 of the present invention is used, as shown in FIG. 16, it is not necessary for the operator to climb the roof 41, and the snow removal attachment 1 is sequentially moved toward the building while being addressed from the eaves. Thus, as shown in FIG. 17, the snow S accumulated on the roof 41 can be removed. At this time, since the snow removal attachment 1 has the shooter 14 for specifying the direction in which the snow S is discharged, the removed snow S can be blown away from the house 4 or at an arbitrary position. There is an advantage that it is not necessary to stack snow.

It is a front view which shows an example of the snow removal attachment to which this invention is applied. It is a side view of the snow removal attachment of this example. FIG. 3 is a view taken in the direction of arrow A in FIG. It is a circuit diagram showing an example of the selection circuit with which the snow removal attachment of this invention is provided. It is a circuit diagram showing the selection circuit of the state which drives a main hydraulic motor by a selection circuit. It is a circuit diagram showing the selection circuit of the state which drives a sub hydraulic motor. It is a circuit diagram showing the selection circuit of the state which stops a main hydraulic motor. It is a circuit diagram showing the selection circuit of the state which stops a subhydraulic motor. It is a circuit diagram showing the selection circuit of the state which protects a main hydraulic motor from excessive pressure. It is a circuit diagram showing the selection circuit of the state where the external force F is applied and the main hydraulic motor rotates right. It is a circuit diagram showing the selection circuit of the state where the external force F is applied and the main hydraulic motor rotates counterclockwise. It is a circuit diagram showing the selection circuit of the state which protects a subhydraulic motor from excessive pressure. It is a circuit diagram showing the selection circuit of the state where the external force F is applied and the auxiliary hydraulic motor rotates to the right. It is a circuit diagram showing the selection circuit of the state where the external force F is applied and the auxiliary hydraulic motor rotates counterclockwise. It is a side view showing the snow removal work by the construction machine equipped with the snow removal attachment of this example. It is the side view showing the snowfall start state of the roof by the construction machine equipped with the snow removal attachment of this example. It is the side view showing the snowfall completion state of the roof by the construction machine equipped with the snow removal attachment of this example.

Explanation of symbols

1 Snow removal attachment
11 Body case
12 Ogre
13 Main hydraulic motor
14 Shuta
15 Sub hydraulic motor 2 selection circuit
21 Branch feed piping
22 Branch return piping
23 Main connection feed piping
24 Main connection return piping
25 Sub-connection feed piping
26 Sub-connection return piping
27 Counterbalance valve 3 Construction machinery
31 arm
311 Feed piping
312 Return piping
32 Boom 4 House S Snow F External force

Claims (4)

The auger and blower are housed in the main body case that is mounted on the arm of the construction machine, and the auger and blower are driven in the snow removal attachment for the construction machine in which a shooter that specifies the direction of snow discharge from the main body case is attached to the main body case. The main hydraulic motor that rotates, the auxiliary hydraulic motor that rotates the shooter horizontally, and the feed pipe and return pipe of the arm are connected to the feed pipe and the return pipe, and only the main hydraulic motor is driven by the oil sent from the feed pipe and the oil sent from the return pipe And a selection circuit for driving only the auxiliary hydraulic motor. The selection circuit connects the main connection feed pipe connected to the main hydraulic motor and the sub connection return pipe connected to the sub hydraulic motor to the feed pipe of the arm, and the main connection return pipe connected to the main hydraulic motor and the sub connection connected to the sub hydraulic motor. Connect the feed pipe to the return pipe of the arm, and provide a check valve on the main connection return pipe that allows oil to flow out from the main connection return pipe and conversely prevents oil from flowing into the main connection return pipe. The snow removal attachment for a construction machine according to claim 1, wherein a check valve is provided in the sub-connection return pipe that allows oil to flow out of the sub-connection return pipe and conversely prevents oil from flowing into the sub-connection return pipe. The selection circuit connects the main connection feed pipe and main connection return pipe connected to the main hydraulic motor with a circulation pipe, and allows oil to flow from the main connection return pipe to the main connection feed pipe. The snow removal attachment for a construction machine according to claim 2, wherein a check valve for preventing oil from flowing into the connection return pipe is provided in the circulation pipe. The selection circuit interposes a counterbalance valve in the secondary connection return pipe connected to the secondary hydraulic motor, and when the oil starts flowing from the return pipe of the arm to the secondary connection feed pipe, the secondary connection return pipe in which the counterbalance valve is interposed The snow removal attachment for a construction machine according to any one of claims 2 and 3, wherein when the flow of oil from the return pipe of the arm to the secondary connection feed pipe is stopped, the secondary connection return pipe interposing the counter balance valve is shut off.

Images