Self-propelled sieving equipment

Abstract

To provide self-propelled sieving equipment which can be self-driven on a public road and has high treatment efficiency.SOLUTION: Self-propelled sieving equipment comprises: a trommel 30 which comprises a trommel main body 31 having cylindrical cage shape, a spiral strip plate 31e arranged spirally in an axial direction on the inner periphery of the trommel main body 31, and a screen 32 arranged on the peripheral surface of the trommel main body 31 and comprising many screening holes, and supported rotatably by a base frame 21; a spindle 33 arranged and coupled coaxially with the trommel 30; a drive motor 40 which is arranged coaxially with the trommel 30 and the spindle 33 and rotates the trommel 30 via the spindle 33; a hopper 51 for charging screening-targets; a charging conveyer 61 which transports the screening-target having dropped from the hopper 51 to the upstream side end portion of the trommel 30 and charges the transported screening-target into the inside of the trommel 30; a small-diameter material discharge conveyer 62; and a large-diameter material discharge conveyer 63.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a screening apparatus for screening and separating soil and sand, and more particularly to a self-propelled screening apparatus capable of self-propelling on public roads. [Background technology]

[0002] Conventionally, a mobile gravel sorting device capable of sifting and sorting large-diameter objects from small-diameter objects has been proposed (see, for example, Patent Document 1, etc.). This gravel sorting device has an inclined support base provided on the upper part of a traveling device having a caterpillar as an endless track, and this inclined support base supports a trommel, which is a cylindrical rotating screen having a large number of holes for gravel sorting, at an incline and rotatably. The gravel sorting device further has a configuration in which a gravel input section is connected to an end opening on the upward side of the trommel, a large-diameter object removal section faces an end opening on the downward side of the trommel, and a small-diameter object removal section is pulled out from the bottom of the trommel to the outside.

[0003] According to the gravel sorting device, gravel poured into a gravel feeding section by a power shovel or the like is sifted and sorted by a trommel into large diameter objects and small diameter objects, with the large diameter objects passing straight through the trommel and removed to the outside from the large diameter object removal section, and the small diameter objects passing through holes in the trommel and being removed to the outside from the small diameter object removal section. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 59-106588 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the gravel sorting apparatus of the above-mentioned prior art has a structure that travels by caterpillar drive, and therefore has a problem that it cannot travel directly to a destination such as a riverbed on a paved public road under its own power under the Road Traffic Act. Furthermore, if the height and width of the entire apparatus including the vehicle and trommel are to be within the limits of the Road Traffic Act, it is difficult to achieve the target processing capacity.

[0006] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a self-propelled sieving apparatus that can be self-propelled on public roads and has high processing efficiency. [Means for solving the problem]

[0007] The self-propelled sieving device of the present invention is composed of a vehicle that can be self-propelled on public roads using tires and has a loading platform, and a sorting unit that is loaded onto the loading platform of the vehicle for sieving and sorting objects such as soil and sand.

[0008] The sorting unit includes a base frame placed on the loading platform, a trommel body having a cylindrical basket shape, a spiral strip arranged in an axial direction on the inner peripheral surface of the trommel body, and a screen arranged on the peripheral surface of the trommel body and having a number of sieve holes, and is rotatably supported on the base frame, a main shaft arranged coaxially with and connected to the trommel, a drive motor arranged coaxially with the trommel and the main shaft and rotating the trommel via the main shaft, a hopper for inputting the objects to be sorted, an input conveyor for transporting the objects to be sorted that have fallen from the hopper to the upstream end of the trommel and inputting them into the trommel, a small diameter object discharge conveyor for transporting small diameter objects that have passed through the sieve holes in the screen and fallen below the trommel and discharging them outside the apparatus, and a large diameter object discharge conveyor for transporting large diameter objects that have fallen downward from an opening at the downstream end of the trommel and discharging them outside the apparatus.

[0009] In the self-propelled screening device having the above configuration, when the objects to be screened, such as gravel excavated from a riverbed or the like, are loaded into the hopper by a power shovel or the like, the objects to be screened are fed into the inside of the trommel from the upstream end by the input conveyor. When the drive motor rotates, the trommel connected to the main shaft rotates, and the objects to be screened in the trommel are guided by the spiral strip while rolling on the inner peripheral surface of the screen, and are transported toward the downstream end. In this process, small-diameter objects that pass through the sieve holes of the screen fall below the trommel and are discharged outside the device by the small-diameter object discharge conveyor. On the other hand, large-diameter objects that do not pass through the sieve holes of the screen are transported to the downstream end of the trommel, drop downward from the opening, and are discharged outside the device by the large-diameter object discharge conveyor.

[0010] According to this configuration, the drive motor that rotates the trommel via the main shaft is arranged coaxially with the trommel, so that the height and width of the device can be made smaller than in a configuration in which the drive motor is arranged non-coaxially with the trommel. In other words, by making the sorting unit more compact, the size of the entire device loaded on the bed of a vehicle can be reduced, and a sorting device that can be self-propelled on public roads is realized. Furthermore, since the spiral strip plate is arranged spirally in the axial direction on the inner peripheral surface of the trommel body, the objects to be sorted supplied to the upstream side of the trommel can be efficiently sieved and sorted while being reliably transported downstream. Therefore, it is possible to provide a self-propelled sieving device that can be self-propelled on public roads and has high processing efficiency.

[0011] The trommel is supported by the platform frame in such a position that its axial direction is horizontal.

[0012] According to this configuration, since the trommel is supported on the frame with the axial direction horizontal, the height of the device can be reduced compared to a configuration in which the trommel is tilted. Also, since the spiral strip is arranged spirally in the axial direction on the inner peripheral surface of the trommel body, the trommel can be arranged in a horizontal position, and the objects to be sorted supplied to the upstream side of the trommel can be transported reliably to the downstream side and efficiently screened.

[0013] In addition, a portion of the main shaft in the axial direction is inserted inside the trommel, and the main shaft is provided with a connecting stirring section that radially connects the main shaft and the inner surface of the trommel body with at least one rod.

[0014] According to this configuration, the connecting stirring section radially connects the main shaft and the inner peripheral surface of the trommel body with at least one rod, thereby firmly connecting the main shaft and the trommel body and simultaneously stirring the object to be sorted with the rod, thereby improving the processing efficiency of the sieving process.

[0015] Further, the connected stirring parts are arranged in a plurality of positions spaced apart in the axial direction on the main shaft, and the rods of each of the connected stirring parts adjacent to each other on the main shaft are arranged so as to be offset around the main shaft.

[0016] According to this configuration, the rods of the adjacent interlocking stirring units are arranged on the main shaft at intervals in the axial direction, thereby improving the stirring capacity. Furthermore, the rods of the adjacent interlocking stirring units on the main shaft are offset from each other around the main shaft, so that the objects to be sorted are evenly mixed in the trommel, and the efficiency of the screening process can be further improved.

[0017] The self-propelled screening device according to the present invention is a self-propelled screening device comprising a vehicle capable of self-propelling on public roads using tires and having a loading platform, and a screening unit that is loaded onto the loading platform of the vehicle and screens and separates soil and sand or other screening objects. The screening unit comprises a base frame that is installed on the loading platform, a trommel body having a cylindrical cage shape, and a screen that is disposed on the circumferential surface of the trommel body and has a number of sieve holes, and is supported by the base frame so as to be freely rotatable. the screen includes a trommel supported by the screen, a drive motor for rotating the trommel, a hopper for feeding the objects to be sorted, an input conveyor for transporting the objects to be sorted that have fallen from the hopper to the upstream end of the trommel and feeding them inside, a small diameter object discharge conveyor for transporting small diameter objects that have passed through the sieve holes in the screen and fallen below the trommel and discharging them outside the apparatus, and a large diameter object discharge conveyor for transporting large diameter objects that have fallen downward from an opening at the downstream end of the trommel and discharging them outside the apparatus.

[0018] The self-propelled sieve sorting device has a height of 4100 mm or less, a width of 2500 mm or less, and a length of 12000 mm or less.

[0019] In the self-propelled screening device having the above configuration, when the objects to be screened, such as gravel excavated from a riverbed or the like, are loaded into the hopper by a power shovel or the like, the objects are fed into the trommel from the upstream end by the input conveyor. When the drive motor rotates, the trommel rotates, and the objects to be screened in the trommel are transported toward the downstream end while rolling on the inner peripheral surface of the screen. In this process, small-diameter objects that pass through the sieve holes of the screen fall below the trommel and are discharged outside the device by the small-diameter object discharge conveyor. On the other hand, large-diameter objects that do not pass through the sieve holes of the screen are transported to the downstream end of the trommel, drop downward from the opening, and are discharged outside the device by the large-diameter object discharge conveyor.

[0020] According to this configuration, it is possible to realize a screening device that can be self-propelled on public roads under the restrictions of the Road Traffic Act. [Brief description of the drawings]

[0021] [Figure 1] 1 is a left side view showing, in partial cross section, the overall configuration of a self-propelled gravel sorting device according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a right side view showing the overall configuration of the trommel. [Diagram 3] 3 is a rear view showing the trommel of FIG. 2 as seen from the rear side. FIG. [Figure 4] FIG. 3 is a plan view of the trommel of FIG. 2. [Diagram 5] This is a photo of the inside of a trommel. [Figure 6] FIG. 2 is a left side view, partially in cross section, showing the self-propelled gravel sorting device in use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, a self-propelled gravel sorting apparatus 1 which is one embodiment of a self-propelled sieving apparatus according to the present invention will be described with reference to the drawings.

[0023] <Configuration of self-propelled gravel sorting device 1> First, the configuration of a self-propelled gravel sorting apparatus 1 according to an embodiment of the present invention will be described with reference to Figs. 1 to 5. Fig. 1 is a left side view showing the entire configuration of a self-propelled gravel sorting apparatus 1 according to an embodiment of the present invention, partially in cross section. Fig. 2 is a right side view showing the entire configuration of a trommel 30, Fig. 3 is a rear view showing the state as seen from the rear side, and Fig. 4 is a plan view. Fig. 5 is a photograph of the inside of the trommel 30. Note that Fig. 1 shows the trommel 30 in vertical cross section, and a part of the screen 32 is broken away to make the internal structure easier to see.

[0024] The self-propelled gravel sorting apparatus 1 is a sieving apparatus that sieves and sorts gravel as a sorting object, and is a device that can be self-propelled on public roads in particular. The self-propelled gravel sorting apparatus 1 is configured to include a vehicle 10, a generator 15, and a sorting unit 20.

[0025] The vehicle 10 is a vehicle that can run on public roads using tires and has a loading platform, and is, for example, a known truck vehicle (e.g., a 10-ton truck). The vehicle 10 is equipped with a plurality of tires 11 for running on roads and a loading platform 12 for carrying the sorting unit 20.

[0026] The generator 15 is a generator for supplying power to the sorting unit 20, and is installed on the loading platform 12 of the vehicle 10. As the generator 15, a known portable diesel generator can be suitably used, for example, an ultra-low noise generator DCA-60LSIB (output 60KVA) manufactured by Denyo Co., Ltd. can be used.

[0027] The sorting unit 20 is an apparatus for sifting and separating gravel to be sorted into small and large diameter objects, and is composed of a mounting frame 21, a trommel 30, a drive motor 40, a hopper 51, a chute 52, an input conveyor 61, a small diameter object discharge conveyor 62, a large diameter object discharge conveyor 63, and a control panel 70.

[0028] The platform frame 21 is a steel frame member provided on the platform 12, and each member constituting the sorting unit 20, such as the trommel 30, the drive motor 40, and the hopper 51, is fixedly installed on the platform frame 21.

[0029] The trommel 30 is a cylindrical sieving member for sifting the gravel to be sorted into small and large diameter pieces, and is placed on the frame 21 in a horizontal position with its axis facing in the fore-and-aft direction of the vehicle 10, and is supported so as to be rotatable around its axis.

[0030] Specifically, the trommel 30 is configured to include a trommel body 31, a screen 32, a main shaft 33, and a roll brush .

[0031] The trommel body 31 is a cylindrical cage-shaped member made of steel, and is generally called a drum. The trommel body 31 has a cylindrical front cylindrical portion 31a and a cylindrical rear cylindrical portion 31b at the axial front end and rear end, respectively. A plurality of axial plates 31c extending in the axial direction are arranged at a predetermined interval in the circumferential direction on the outer periphery of the front cylindrical portion 31a and the rear cylindrical portion 31b, and integrate the front cylindrical portion 31a and the rear cylindrical portion 31b. In addition, a plurality of annular plates 31d are arranged in parallel at a predetermined interval between the front cylindrical portion 31a and the rear cylindrical portion 31b, and are fixed to the plurality of axial plates 31c to form a lattice shape. Furthermore, a spiral strip plate 31e having a predetermined width is arranged in a spiral shape on the inner circumferential surface of the trommel body 31 between the front cylindrical portion 31a and the rear cylindrical portion 31b. The spiral strip 31e is provided spirally in the rotation direction (the rotation direction of the drive motor 40 via the main shaft 33) from the axial front end side to the rear end side (i.e., the conveying direction of the sorting objects) of the trommel body 31. The size of the trommel body 31 is, for example, a diameter of 2000 mm and a length of 6000 mm.

[0032] The screen 32 is a sheet-like member having many sieve holes. Specifically, the screen 32 may be a wire mesh having many meshes or a thin metal plate having many punched holes. The screen 32 is detachably attached to the outer periphery of the trommel body 31. The area several hundred mm wide from the front cylindrical portion 31a at the front end of the trommel body 31 to the rear side is an opening 31f where the screen 32 is not disposed. Specifically, the screen 32 is fixed by screws at a plurality of locations on the outer periphery side of the axial plate 31c. As the screen 32 for sieving and sorting concrete sand, for example, a wire mesh having an opening of 5 mm or a thin metal plate having many punched holes with a diameter of 5 mm may be used.

[0033] The main shaft 33 is arranged coaxially (along the axial direction) at the axial center on the inner periphery of the trommel body 31. The main shaft 33 is supported rotatably near the end on the front end side via a main shaft bearing 33a, and the front end is connected to the output shaft of the drive motor 40 via a coupling 33b. The main shaft 33 extends over about 2 / 3 of the entire axial length of the trommel body 31, and is provided with three cross-shaped connecting stirring parts 33c at intervals in the axial direction. Each connecting stirring part 33c has four rods 32d that extend radially at 90 degrees in the circumferential direction on the outer periphery of the main shaft 33 and form a cross shape in the axial view, and the tip of each rod 32d is connected to the inner periphery of the trommel body 31 (annular plate 31d). In other words, the main shaft 33 is connected to the trommel body 31 via the connecting stirring parts 33c to be integrated. In addition, the three connected stirring units 33c are provided at intervals in the axial direction, and the rods 32d of the adjacent connected stirring units 33c are arranged around the main shaft 33 in a shifted manner.

[0034] The roll brush 34 is configured by implanting brush bristles on the surface of a brush shaft having a generally cylindrical shape extending in the front-rear direction. The roll brush 34 is disposed adjacent to and parallel to the upper part of the rear side of the trommel body 31, and the brush bristles are in contact with the screen 32 from the outer periphery. The roll brush 34 rotates in response to the rotation of the trommel body 31, and has the function of scraping out gravel stuck in the mesh of the screen 32 with the brush bristles.

[0035] The drive motor 40 is a motor for rotating the trommel 30 via the main shaft 33, and is disposed coaxially in front of the trommel 30. The output shaft of the drive motor 40 is connected to the main shaft 33 via a coupling 33b. The rotation of the output shaft of the drive motor 40 is reduced by a predetermined reduction ratio (e.g., 1 / 104) by the coupling 33b and transmitted to the main shaft 33. The rotation speed of the main shaft 33 (i.e., the rotation speed of the trommel 30) is, for example, a maximum of 17 rpm.

[0036] The hopper 51 is a funnel-shaped member for inputting gravel to be sorted from a power shovel or the like. The hopper 51 has a shape that opens widely at the upper end, which is the input side, and narrows toward the lower end, which is the discharge side. The hopper 51 is disposed adjacent to the rear side of the trommel 30.

[0037] The chute 52 is a plate-like member for guiding the small-diameter gravel that has fallen through the mesh of the screen 32 onto the small-diameter object discharge conveyor 62. The chute 52 is disposed along the axial direction from the side to the bottom of the outer circumferential surface of the trommel 30. The chute 52 has an inclined surface that is inclined at a predetermined angle, and the small-diameter gravel that has fallen through the mesh of the screen slides down on the inclined surface to be guided onto the small-diameter object discharge conveyor 62. The chute 52 is divided into front and rear portions at the approximate center of the axial direction of the trommel 30, with a gap of about 100 mm between them. A pair of support rollers 21r is provided on both the left and right sides of the trommel 30, on the frame 21 near the gap and the rear cylindrical portion 31b, and supports the trommel 30 rotatably.

[0038] The feeding conveyor 61 is a belt conveyor arranged in the front-to-rear direction below the hopper 51, which transports the gravel to be sorted, which is discharged from the opening at the bottom end of the hopper 51 and placed on the upper surface of the endless belt, forward and feeds it into the trommel 30 at its upstream end.

[0039] The small-diameter object discharge conveyor 62 is a belt conveyor arranged in the front-to-rear direction below the trommel 30, which transports small-diameter objects (small-diameter gravel, etc.) that have fallen directly through the sieve holes in the screen 32 or through the chute 52 and are placed on the upper surface of the endless belt to the rear and discharges them outside the device.

[0040] The large-diameter object discharge conveyor 63 is a belt conveyor arranged in a left-right direction intersecting the axial direction below the front end of the trommel 30, and conveys large-diameter objects (large-diameter gravel, garbage, etc.) that are discharged from an opening 31f provided near the front end of the trommel 30 without passing through the sieve holes of the screen 32 and placed on the upper surface of the endless belt to the side and discharge them outside the device.

[0041] The control panel 70 is a device for controlling the drive of each part of the sorting unit 20, and is installed adjacent to the generator 15 on the loading platform 12 of the vehicle 10. The control panel drives and controls the drive motor 40, the input conveyor 61, the small diameter object discharge conveyor 62, and the large diameter object discharge conveyor 63 using power supplied from the generator 15.

[0042] <Functions of each part in the self-propelled gravel sorting device 1> Next, the operation of each part when sieving gravel using the self-propelled gravel sorting device 1 will be described with reference to Fig. 6. Fig. 6 is an explanatory diagram showing the self-propelled gravel sorting device 1 in use. Note that Fig. 6 shows a vertical cross section of only the trommel 30.

[0043] First, a driver gets into the driver's seat provided at the front of the vehicle 10 of the self-propelled gravel sorting device 1 and drives the device from the storage location on a public road to a gravel mining site such as a riverbed. The self-propelled gravel sorting device 1 is not a caterpillar-driven vehicle, but is equipped with a tire-driven vehicle 10 equipped with tires 11, and is therefore capable of running on public roads. In addition, the self-propelled gravel sorting device 1 is 3900 mm high, 2500 mm wide, and 12000 mm long, which are within the limits of the Road Traffic Act, and the height is between 3800 mm and 4100 mm, so that it can be run on public roads with permission.

[0044] When the self-propelled gravel sorting device 1 arrives at a gravel mining site such as a riverbed, it is parked in an appropriate location and an external transport conveyor 64 transported separately is installed, as shown in Fig. 10. The self-propelled gravel sorting device 1 does not need to be supported by a self-supporting stand (outrigger) and only needs to be parked, so it can be moved quickly as needed.

[0045] The external transport conveyor 64 is a belt conveyor used to pile up small diameter objects (small diameter gravel to become concrete sand) discharged by the small diameter object discharge conveyor 62 in a wide area several meters away from the self-propelled gravel sorting device 1. The input side end of the external transport conveyor 64 is positioned below the discharge side end of the small diameter object discharge conveyor 62, and the discharge side end is positioned at a height of about 2.5 m from the ground.

[0046] An off-road vehicle 65 can be used to move and install the external transfer conveyor 64. The off-road vehicle 65 is a civil engineering machine also called a crawler carrier, and includes a crawler-type traveling body and a loading platform.

[0047] After completing the installation of the self-propelled gravel sorting device 1 and the external transport conveyor 64, start the generator 15 to supply power, and operate the control panel 70 to operate the drive motor 40, the input conveyor 61, the small diameter object discharge conveyor 62, and the large diameter object discharge conveyor 63. The external transport conveyor 64 is also operated by a separate operation.

[0048] With each part of the self-propelled gravel sorting device 1 and the external transport conveyor 64 in operation, gravel is excavated using a power shovel or the like, and the gravel to be sorted is loaded into the hopper 51.

[0049] The gravel fed into the hopper 51 slides down due to its own weight and falls onto the feeding conveyor 61 from the opening at the bottom. The gravel is transported forward by the feeding conveyor 61, drops from the front end of the conveyor, and is fed into the inside of the upstream end of the trommel 30. The gravel fed into the trommel 30 is gradually broken into smaller pieces by impacts from the inner surface of the trommel body 31 rotated by the drive motor 40 and the spiral strip 31e, and is transported forward by the action of the spiral strip 31e. Furthermore, the gravel is stirred by the axial cross-shaped connected stirring section 33c provided on the main shaft 33, and the gravel is effectively separated.

[0050] While the gravel is transported from the rear end to the front end in this manner within the trommel 30, small-diameter gravel smaller than the diameter of the sieve holes in the screen 32 passes through the sieve holes in the screen 32 and falls directly or via the chute 52 onto the small-diameter object discharge conveyor 62. The small-diameter gravel that has fallen onto the small-diameter object discharge conveyor 62 is transported forward by the small-diameter object discharge conveyor 62 and discharged from the front end, which is the discharge side end, and falls onto the external transport conveyor 64. The small-diameter gravel that has fallen onto the external transport conveyor 64 is transported by the external transport conveyor 64 and discharged from the discharge side end, and is piled up on the ground below.

[0051] On the other hand, large-diameter gravel and trash (hereinafter referred to as large-diameter gravel, etc.) larger than the sieve holes of the screen 32 do not pass through the sieve holes of the screen 32, but are transported forward inside the trommel 30 by the action of the spiral band plate 31e, discharged from the opening 31f on the front end side, and drop onto the large-diameter object discharge conveyor 63. The large-diameter gravel, etc. that has fallen and been placed on the large-diameter object discharge conveyor 63 is transported in the left-right direction by the large-diameter object discharge conveyor 63 and discharged from the discharge side end to the outside of the device to the side of the self-propelled gravel sorting device 1.

[0052] The self-propelled gravel sorting device 1 according to this embodiment can sieve and sort 300 cubic meters of gravel in continuous operation for eight hours a day, for example.

[0053] Generally, when sorting concrete sand from gravel collected from a riverbed, washing with water may be required to remove mud. In such cases, washing gravel from a riverbed or the like is subject to the Water Pollution Prevention Act. On the other hand, when collecting river gravel with little mud (for example, river gravel from the Kiso River, etc.) and sorting it, washing with water may not be required. Therefore, when collecting river gravel with little mud and sorting it with the self-propelled gravel sorting device 1, there is an advantage in that concrete sand can be obtained without washing (in other words, outside the scope of the Water Pollution Prevention Act) by using a screen 32 with a sieve hole diameter of 5 mm.

[0054] <Summary of the embodiment> As is clear from the above detailed description, the self-propelled gravel sorting device 1 of this embodiment is configured to include a vehicle 10 that is capable of self-propelling on public roads using tires 11 and has a loading platform 12, and a sorting unit 20 that is loaded onto the loading platform 12 of the vehicle 10 and is used to sift and sort soil and sand and other sorting objects.

[0055] The sorting unit 20 includes a base frame 21 disposed on the loading platform 12, a trommel body 31 having a cylindrical cage shape, a spiral strip 31e disposed in an axial direction spirally on the inner peripheral surface of the trommel body 31, a screen 32 disposed on the peripheral surface of the trommel body 31 and having a large number of sieve holes, a trommel 30 supported rotatably on the base frame 21, a main shaft 33 disposed coaxially with and connected to the trommel 30, and a main shaft 33 disposed coaxially with the trommel 30 and the main shaft 33, and a trommel 30 is moved through the main shaft 33. The trommel 30 is equipped with a drive motor 40 for rotating the trommel 30, a hopper 51 for feeding gravel to be sorted, an input conveyor 61 for transporting the gravel to be sorted that has fallen from the hopper 51 to the upstream end of the trommel 30 and feeding it inside, a small diameter object discharge conveyor 62 for transporting small diameter objects that have passed through the sieve holes in the screen 32 and fallen below the trommel 30 and discharged them outside the device, and a large diameter object discharge conveyor 63 for transporting large diameter objects that have fallen downward from an opening 31f at the downstream end of the trommel 30 and discharged them outside the device.

[0056] In the self-propelled gravel sorting device 1 having the above-mentioned configuration, when gravel excavated from a riverbed or the like by a power shovel or the like is thrown into the hopper 51, the gravel is supplied from the upstream end of the trommel 30 to the inside by the feeding conveyor 61. When the drive motor 40 rotates, the trommel 30 connected to the main shaft 33 rotates, and the gravel in the trommel 30 is guided by the spiral strip 31e while rolling on the inner peripheral surface of the screen 32 and transported toward the downstream end. In this process, small diameter objects (small diameter gravel) that pass through the sieve holes of the screen 32 fall below the trommel 30 and are discharged outside the device by the small diameter object discharge conveyor 62. On the other hand, large diameter objects that do not pass through the sieve holes of the screen 32 are transported to the downstream end of the trommel 30, fall downward from the opening 31f, and are discharged outside the device by the large diameter object discharge conveyor 63.

[0057] According to this configuration, the drive motor 40 that rotates the trommel 30 via the main shaft 33 is arranged coaxially with the trommel 30, so that the height and width of the device can be made smaller than in a configuration in which the drive motor 40 is arranged non-coaxially with the trommel 30. In other words, by making the sorting unit 20 smaller, the size of the entire device loaded on the loading platform 12 of the vehicle 10 is reduced, and a sorting device that can be self-propelled on public roads is realized. Furthermore, since the spiral strip 31e is arranged spirally in the axial direction on the inner peripheral surface of the trommel body 31, the gravel supplied to the upstream side of the trommel 30 can be efficiently screened and sorted while being reliably transported to the downstream side. Therefore, it is possible to provide a self-propelled gravel sorting device 1 that can be self-propelled on public roads and has high processing efficiency.

[0058] The trommel 30 is supported by the base frame 21 in a position in which the axial direction is horizontal.

[0059] According to this configuration, the trommel 30 is supported on the base frame 21 in a position in which the axial direction is horizontal, so that the height of the device can be kept smaller than in a configuration in which the trommel 30 is disposed at an angle. Also, since the spiral strip plate 31e is disposed spirally in the axial direction on the inner peripheral surface of the trommel body 31, the trommel 30 can be disposed in a horizontal position, and the objects to be sorted supplied to the upstream side of the trommel 30 can be transported reliably to the downstream side and efficiently screened.

[0060] In addition, a portion of the main shaft 33 in the axial direction is inserted inside the trommel 30, and the main shaft 33 and the inner peripheral surface of the trommel body 31 are radially connected by at least one rod 32d to form a connecting stirring section 33c.

[0061] According to this configuration, the connecting stirring section 33c radially connects the main shaft 33 and the inner surface of the trommel body 31 with at least one rod 32d (four in this embodiment), thereby firmly integrating the main shaft 33 and the trommel 30 and at the same time, by using the rod 32d to stir the gravel, the efficiency of the sieving process can be improved.

[0062] In addition, the connecting stirring sections 33c are arranged in multiple locations (four locations) on the main shaft 33 at intervals in the axial direction, and adjacent connecting stirring sections 33c on the main shaft 33 are arranged such that the rods 32d are shifted around the main shaft 33 (so that they do not overlap when viewed in the axial direction).

[0063] According to this configuration, the mixing capacity is improved by arranging a plurality of connected stirring units 33c at intervals in the axial direction on the main shaft 33. Furthermore, in each of the adjacent connected stirring units 33c on the main shaft 33, the rods 32d are arranged offset from each other around the main shaft 33, so that the gravel to be sorted is evenly mixed inside the trommel 30, and the processing efficiency of the sieving can be further improved.

[0064] The self-propelled gravel sorting device 1 according to this embodiment is configured to include a vehicle 10 that can be self-propelled on public roads using tires 11 and has a loading platform 12, and a sorting unit 20 that is loaded onto the loading platform 12 of the vehicle 10 and sieves and sorts objects to be sorted, such as soil and sand. The sorting unit 20 includes a base frame 21 that is disposed on the loading platform 12, a trommel body 31 that has a cylindrical cage shape, and a screen 32 that is disposed on the periphery of the trommel body 31 and has a number of sieve holes. The trommel 30 is supported by the base frame 21 so as to be freely rotatable. The apparatus comprises a drive motor 40 for rotating the trommel 30, a hopper 51 for feeding gravel to be sorted, an input conveyor 61 for transporting the gravel to be sorted that has fallen from the hopper 51 to the upstream end of the trommel 30 and feeding it therein, a small diameter object discharge conveyor 62 for transporting small diameter objects that have passed through the sieve holes in the screen 32 and fallen below the trommel 30 and discharged them outside the apparatus, and a large diameter object discharge conveyor 63 for transporting large diameter objects that have fallen downward from an opening 31f at the downstream end of the trommel 30 and discharged them outside the apparatus.

[0065] The self-propelled gravel sorting device 1 has a height of 4100 mm or less, a width of 2500 mm or less, and a length of 12000 mm or less.

[0066] In the self-propelled gravel sorting device 1 having the above-mentioned configuration, when gravel excavated from a riverbed or the like by a power shovel or the like is thrown into the hopper 51, the gravel is supplied from the upstream end of the trommel 30 to the inside by the feeding conveyor 61. When the drive motor 40 rotates, the trommel 30 rotates, and the gravel in the trommel 30 is transported toward the downstream end while rolling on the inner peripheral surface of the screen 32. In this process, small diameter objects (small diameter gravel) that pass through the sieve holes of the screen 32 fall below the trommel 30 and are discharged outside the device by the small diameter object discharge conveyor 62. On the other hand, large diameter objects that do not pass through the sieve holes of the screen 32 are transported to the downstream end of the trommel 30, fall downward from the opening 31f, and are discharged outside the device by the large diameter object discharge conveyor 63.

[0067] According to this configuration, it is possible to realize a screening device that can be self-propelled on public roads under the restrictions of the Road Traffic Act.

[0068] <Modification> The present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-mentioned embodiment, the self-propelled sieving device of the present invention is applied to a self-propelled gravel sorting device for the purpose of sieving gravel, but the present invention is not limited to this, and can be applied to sieving devices for various purposes by changing the hole diameter of the sieving holes of the screen 32. For example, by using a screen 32 with a hole diameter of 10 mm to several tens of mm, the screen can be applied to the purpose of sieving and sorting earth and sand mixed with disaster waste. In this case, the self-propelled sieving device according to the present invention can travel on public roads to disaster areas and the like and quickly carry out disaster recovery support activities.

[0069] In the above embodiment, the trommel 30 is supported on the frame 21 in a position where the axial direction is horizontal, but this is not limiting. For example, the trommel 30 may be supported on the frame 21 in a position where it is inclined at a predetermined angle obliquely downward toward the front of the vehicle, which is the downstream side in the transport direction of the sorting objects, as long as the height of the device is within the range of 4100 mm or less, which is the restriction under the Road Traffic Act. According to this modification, the soil and sand to be sorted can be transported downstream more efficiently by utilizing gravity in the trommel 30. In this modification, the main shaft 33 and the drive motor 40, which are arranged coaxially with the trommel 30, are also arranged in a position where they are inclined at a predetermined angle obliquely downward toward the front of the vehicle. [Explanation of symbols]

[0070] 1. Self-propelled gravel sorting equipment (self-propelled sieve sorting equipment) 10 Vehicles 12 Cargo Bed 20 Sorting Unit 21 Mounting frame 30 Trommel 31 Trommel body 31e spiral strip 31f opening 32 screens 33 Main axis 33c Connected stirring section 33d Rod 40 Drive motor 51 Hopper 61 Input conveyor 62 Small diameter item discharge conveyor 63 Large diameter discharge conveyor

Claims

1. A self-propelled screening device comprising a vehicle capable of self-propelling on public roads by tires and having a loading platform, and a screening unit that is loaded on the loading platform of the vehicle and screens and screens soil and other screening objects, The sorting unit comprises: A platform frame installed on the platform; a trommel comprising a cylindrical cage-shaped trommel body, a spiral strip disposed in an axial direction on an inner peripheral surface of the trommel body, and a screen disposed on the peripheral surface of the trommel body and having a number of sieve holes, the trommel being rotatably supported on the frame; a main shaft coaxially disposed and connected to the trommel; a drive motor arranged coaxially with the trommel and the spindle to rotate the trommel via the spindle; A hopper for inputting the objects to be sorted; an input conveyor that conveys the sorting object that has fallen from the hopper to an upstream end of the trommel and inputs it into the inside; a small-diameter object discharge conveyor for conveying the small-diameter objects that have passed through the sieve holes of the screen and fallen below the trommel and discharging them outside the apparatus; a large-diameter object discharge conveyor for conveying the large-diameter object that has fallen downward from an opening at the downstream end of the trommel and discharging it outside the device; A self-propelled sieve sorting device comprising:

2. 2. The self-propelled screening device according to claim 1, wherein the trommel is supported by the frame with its axial direction horizontal.

3. 3. The self-propelled screening device according to claim 1 or 2, wherein a part of the main shaft in the axial direction is inserted into the inside of the trommel, and the main shaft is provided with a connecting stirring section in which at least one rod connects the main shaft and the inner peripheral surface of the trommel body in the radial direction.

4. The connected stirring units are arranged on the main shaft at intervals in the axial direction, The self-propelled sieve screening device according to claim 3 , wherein the rods of each of the connected stirring units adjacent to each other on the main shaft are arranged so as to be offset from each other around the main shaft.

5. A self-propelled screening device comprising a vehicle capable of self-propelling on public roads by tires and having a loading platform, and a screening unit that is loaded on the loading platform of the vehicle and screens and screens soil and other screening objects, The sorting unit comprises: A platform frame installed on the platform; A trommel including a cylindrical cage-shaped trommel body and a screen having a number of sieve holes disposed on a peripheral surface of the trommel body, the trommel being rotatably supported by the frame; a drive motor for rotating the trommel; A hopper for inputting the objects to be sorted; an input conveyor that conveys the sorting object that has fallen from the hopper to an upstream end of the trommel and inputs it into the inside; a small-diameter object discharge conveyor for conveying the small-diameter objects that have passed through the sieve holes of the screen and fallen below the trommel and discharging them outside the apparatus; a large-diameter object discharge conveyor for conveying the large-diameter object that has fallen downward from an opening at the downstream end of the trommel and discharging it outside the device; Equipped with The self-propelled sieve sorting device has a height of 4100 mm or less, a width of 2500 mm or less, and a length of 12000 mm or less.

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