Compaction machine

Abstract

To provide a compaction machine with a simple configuration that can reduce the burden of draining spray equipment. [Solution] The macadam roller 1 includes a spraying device 20 comprising a tank 21 for storing water (liquid), a pump 23 for pressurizing the liquid stored in the tank 21, a nozzle 25 for spraying the liquid pressurized from the pump 23 onto the compaction wheel 15, a filter 24 for filtering the liquid supplied from the tank 21 to the nozzle 25, and piping 30 connecting the pump 23, the filter 24, and the nozzle 25. The inlet port 24a is positioned below the discharge port 23a of the pump 23 during draining operations to discharge liquid from the drain section 24d, and the first outlet port 24b and the second outlet port 24c are positioned below the nozzle 25 during draining operations.

Description

Technical Field

[0001] The present invention relates to a rolling machine.

Background Art

[0002] Conventionally, a technique related to a rolling machine equipped with a spraying device for spraying a liquid such as water or a liquid agent on a rolling wheel is known. For example, in Patent Document 1, in a rolling machine, in order to prevent water remaining in a spraying device (spraying device) from freezing and expanding in a low-temperature environment such as winter, causing damage to the device, it is described that the liquid is discharged from a drain target part in the spraying device. In this rolling machine, compressed air is supplied to the piping of the spraying device (spraying device) to discharge the water remaining in the drain target part in a short time.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration of Patent Document 1 described above, a device for supplying compressed air is required, which leads to an increase in the number of parts of the rolling machine and a complication of the device configuration. On the other hand, in order to reliably discharge the liquid remaining in a plurality of drain target parts without using compressed air, a configuration in which a drain part is provided in each drain target part can be considered. In this case, since the drain operation for discharging the liquid from a plurality of drain target parts requires all of the plurality of drain parts to be opened, it is a great burden for maintenance workers.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a rolling machine that can reduce the burden on the drain operation of the spraying device with a simple configuration. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides a compaction machine equipped with a spraying device including a tank for storing liquid, a pump for pumping the liquid stored in the tank, a nozzle for spraying the liquid pumped from the pump onto compaction wheels, a filter for filtering the liquid supplied from the tank to the nozzle, and piping connecting the pump, the filter, and the nozzle, wherein the filter includes an inlet port connected to the pump, an outlet port connected to the nozzle from which the filtered liquid flowing in from the inlet port is discharged, and a drain section capable of discharging the liquid remaining inside the filter to the outside, the piping includes an input pipe connecting the discharge port of the pump and the inlet port of the filter, and an output pipe connecting the outlet port of the filter and the nozzle, and the inlet port and outlet port of the filter are positioned below the discharge port of the pump and the nozzle when draining the liquid from the drain section. [Effects of the Invention]

[0007] According to the compaction machine of the present invention, it is possible to reduce the burden of draining the spraying device with a simple configuration. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing a macadam roller as a compaction machine according to an embodiment. [Figure 2] This is a schematic diagram showing a watering system. [Figure 3] This is a perspective view showing the filter's mounting position in its normal location. [Figure 4] Figure 3 is a perspective view showing the inside of the side frame. [Figure 5] This is a perspective view showing the filter's installation status at the maintenance location. [Figure 6]Figure 5 is a perspective view showing the inside of the side frame. [Figure 7] This is a schematic diagram of the filter in its normal position, viewed from the front of the vehicle in the longitudinal direction. [Figure 8] This is a side view showing the macadam roller tilted forward. [Figure 9] This is a side view showing the macadam roller tilted towards the rear. [Modes for carrying out the invention]

[0009] One embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a side view showing a macadam roller as a compaction machine according to the embodiment. The macadam roller 1 is a compaction machine for performing compaction work (tamping work) on a predetermined work area such as a road surface or ground. As shown in the figure, the macadam roller 1 comprises a vehicle body 10, compaction wheels 15, and a spreading device 20 (Figure 2).

[0010] The vehicle body 10 comprises a front body 10a and a rear body 10b, which are connected so as to bend horizontally around an articulated mechanism. The front body 10a is equipped with a driver's seat 5 where the driver sits, and an operating platform 6 which has a steering wheel for controlling the direction of travel of the macadam roller 1, a forward / reverse lever for switching between forward and reverse, and a brake pedal. An engine room is defined inside the front body 10a, and the engine and equipment related to the HST (Hydraulic Static Transmission) powered by the engine are mounted in the engine room. The rear body 10b is provided with a gap between them in the vehicle width direction (left-right direction) and includes a pair of side frames (vehicle frames) 11 that extend in the vehicle front-rear direction, and a front frame 12 (see Figure 3) connected between the pair of side frames 11 and extending in the vehicle width direction. Some components of the spraying device 20 are mounted on the inside of the side frames 11 in the vehicle width direction (hereinafter referred to as "inside").

[0011] The compaction wheels 15 are rollers used to compact road surfaces and ground, and include a front compaction wheel 151 and a rear compaction wheel 152. The front compaction wheel 151 consists of a pair of metal drums and is rotatably supported on the left and right sides of the front vehicle body 10a. The rear compaction wheel 152 consists of a single metal drum and is rotatably supported by support arms provided on the left and right sides of the rear vehicle body 10b. Each compaction wheel 15 is driven by a built-in hydraulic motor for travel, which causes the vehicle body 10 to move.

[0012] Figure 2 is a schematic diagram showing the spraying device. The spraying device 20 prevents road surface materials such as asphalt paving material from adhering to each compaction wheel 15 by spraying water onto each compaction wheel 15. As shown in Figure 2, the spraying device 20 comprises a tank 21, a switching valve 22, a pump 23, a filter 24, nozzles 25 including a front nozzle 251 and a rear nozzle 252, a controller 26, and a spray switch 27. The tank 21, switching valve 22, pump 23, filter 24, and each nozzle 25 are arranged in this order from the upstream side to the downstream side in the water supply direction and are connected by piping 30. The piping 30 is made up of flexible hoses or the like. The piping 30 includes a first pipe 31, a second pipe (input pipe) 32, a third pipe (output pipe) 33, and a fourth pipe (output pipe) 34.

[0013] Tank 21 stores the water sprayed onto each compaction wheel 15. Tank 21 is connected to pump 23 via a switching valve 22 and a first pipe 31. As shown in Figure 1, Tank 21 is mounted inside a pair of side frames 11 at the front of the rear body 10b. The upper surface 21a of Tank 21 is located below the top 15t of each compaction wheel 15. The lower surface 21b of Tank 21 (see Figure 4) is located near the bottom of the rear body 10b.

[0014] The switching valve 22 connects and switches the connection between the tank 21 and the pump 23. The switching valve 22 is the main valve for the tank 21 and is opened and closed manually by an operator. The pump 23 is connected to the filter 24 via the second pipe 32 and pumps water from the tank 21 downstream. The pump 23 is driven and controlled by the controller 26. The pump 23 is mounted near the tank 21 at the front lower part of the rear vehicle body 10b via a support member (not shown).

[0015] The filter 24 includes an inlet port 24a (Figure 7), a first outlet port 24b (Figures 6 and 7), and a second outlet port 24c (Figure 6). The inlet port 24a is connected to the discharge port 23a of the pump 23 (Figures 4 and 6) via a second pipe 32. The first outlet port 24b is connected to the front nozzle 251 via a third pipe 33. The second outlet port 24c is connected to the rear nozzle 252 via a fourth pipe 34. In Figure 6, the first outlet port 24b and the second outlet port 24c are schematically shown with dashed lines. The second outlet port 24c is positioned alongside the first outlet port 24b shown in Figure 7, along the longitudinal direction of the vehicle. The filter 24 filters the water flowing in from the inlet port 24a and discharges it from the first outlet port 24b and the second outlet port 24c. In other words, the filter 24 filters the water supplied from the tank 21 to the front nozzle 251 and the rear nozzle 252. A drain section 24d is provided at the lower end of the filter 24 to discharge any water remaining inside to the outside. The drain section 24d is equipped with a handle 24h that can be manually switched between an open and closed state. By rotating the handle 24h to open the drain section 24d, the water inside the filter 24 is discharged. The mounting structure of the filter 24 will be described later.

[0016] The front nozzle 251 is a nozzle that sprays water onto the front compaction wheel 151. A plurality of front nozzles 251 are provided side by side in the vehicle width direction above the front compaction wheel 151 and near its top 15t. Specifically, each front nozzle 251 is arranged on the extension line of the center line L1 along the vertical direction of the front compaction wheel 151. The rear nozzle 252 is a nozzle that sprays water onto the rear compaction wheel 152. A plurality of rear nozzles 252 are provided side by side in the vehicle width direction above the rear compaction wheel 152 and near its top 15t. Specifically, each rear nozzle 252 is arranged on the extension line of the center line L2 along the vertical direction of the rear compaction wheel 152. Thereby, each nozzle 25 is arranged above the upper surface (upper end) 21a of the storage part of the tank 21. The storage part is a part for storing water in the tank 21 and does not include components attached to the outer surface of the storage part, such as a cap attached to a water supply port not shown. However, each nozzle 25 only needs to be arranged at a position higher than the water level at the reference liquid volume of the tank 21 when the macadam roller 1 is on flat ground, and it is more preferable to be arranged at a position higher than the upper surface 21a of the above storage part.

[0017] The controller 26 is composed of, for example, a central processing unit (CPU), a ROM (Read Only Memory), a RAM (Random Access Memory), a non-volatile RAM, etc. The controller 26 is mounted on the vehicle body 10. A spray switch 27 for switching the execution of watering from the spraying device 20 is connected to the controller 26. The spray switch 27 is provided on the operation console 6 and is configured to be manually operable by the driver. When watering is instructed by the spray switch 27, the controller 26 drives and controls the pump 23 to supply the water in the tank 21 to the front nozzles 251 and the rear nozzles 252 and spray it onto each compaction wheel 15. When watering is not instructed by the spray switch 27, the controller 26 stops the operation of the pump 23.

[0018] Next, the attachment structure of the filter 24 will be described while referring to the drawings. FIG. 3 is a perspective view showing the attachment state of the filter 24 in the normal position P1. FIG. 4 is a perspective view showing the inside of the side frame 11 in FIG. 3. FIG. 5 is a perspective view showing the attachment state of the filter 24 in the maintenance position P2. FIG. 6 is a perspective view showing the inside of the side frame 11 in FIG. 5. FIG. 7 is a schematic view of the filter 24 in the normal position P1 viewed from the front side in the vehicle longitudinal direction. In FIGS. 4 and 6, the side frame 11 is shown by a two-dot chain line.

[0019] The macadam roller 1 of the present embodiment is configured such that the position of the filter 24 can be changed between the normal position P1 and the maintenance position P2. The normal position P1 is a position other than when drain work is performed, such as when the macadam roller 1 performs compaction work or travels. In the normal position P1, the lower end of the filter 24 is set higher than a preset lowest ground height H1 (refer to the two-dot chain line in FIG. 1) of the macadam roller 1. The lowest ground height H1 is the vertical distance between the lowest part of the frame constituting the vehicle body 10 or equipment attached to the frame (in this embodiment, a hydraulic hose near the center of the vehicle body 10 in the vehicle longitudinal direction) and the ground, and is set so as to avoid contact with obstacles or steps on the ground. Thereby, it is possible to suppress the filter 24 from contacting obstacles or steps on the ground during operation of the macadam roller 1. That is, by providing the filter 24 at a position higher than the lowest ground height H1, it is possible to suppress the filter 24 from being damaged.

[0020] In contrast, maintenance position P2 is the position for performing draining operations to discharge water from the drain target area of ​​the spraying device 20. At maintenance position P2, the filter 24 is positioned lower than the minimum ground clearance H1 and in a position where it does not come into contact with the ground when the macadam roller 1 is on flat ground. This improves the efficiency of the draining operation. Furthermore, since the macadam roller 1 does not move and its distance from the ground does not change during draining operations, there is no need to worry about the filter 24 coming into contact with the ground even if it is positioned lower than the minimum ground clearance H1. The drain target area is the part located downstream of the switching valve 22 in the water supply direction. That is, the drain target area includes the first pipe 31, the pump 23, the second pipe 32, the filter 24, the third pipe 33 and the fourth pipe 34, and each nozzle 25. Drainage is performed, for example, in low-temperature environments such as winter, to prevent water remaining in the drainage target area of ​​the spraying device 20 from freezing and expanding, causing damage to the drainage target area while the macadam roller 1 is stopped. Drainage is performed by closing the switching valve 22 to disconnect the connection between the tank 21 and the pump 23, stopping the operation of the pump 23, and then having an operator open the drain section 24d of the filter 24.

[0021] The normal position P1 will now be described. As shown in Figures 3 and 7, the side frame 11 has an opening 111 through which a portion of the filter 24 is inserted. The opening 111 is a notch that extends upward from the lower edge of the side frame 11. A U-shaped bracket 40 is attached to the outer surface of the side frame 11 in the vehicle width direction (hereinafter referred to as the "outer side"), straddling the opening 111 in the vehicle longitudinal direction. As shown in Figure 5, the bracket 40 has two fastening holes 41 for fastening bolts B1, spaced apart in the vehicle longitudinal direction.

[0022] On the other hand, the upper end portion 241 (Figure 7) of the filter 24 is provided with a mounting portion 50 that abuts against the outer surface of the bracket 40. The filter 24 is fixed to the side frame 11 by fastening two bolts B1 through through holes (not shown) into fastening holes 41 while the mounting portion 50 is in contact with the bracket 40. The heads of the bolts B1 have gripping portions that can be grasped by an operator, and the operator can rotate the bolts B1 by grasping the gripping portions. This allows the filter 24 to be easily attached to and detached from the side frame 11.

[0023] At this time, as shown in Figures 4 and 7, the second pipe 32 extending from the pump 23 is connected to the upper end 241 of the filter 24 through the gap between the pump 23 and the side frame 11. In addition, the third pipe 33 and the fourth pipe 34 connecting the filter 24 to each nozzle 25 are connected to the upper end 241 of the filter 24 outside the opening 111. The third pipe 33 and the fourth pipe 34 extend along the axial direction of the filter 24 from the first outlet port 24b and the second outlet port 24c, which are the connection points to the filter 24, and extend through the opening 111 to the inside of the side frame 11.

[0024] Furthermore, openings 112, 113, and 114 are formed in the side frame 11. The third pipe 33 and the fourth pipe 34, inserted through opening 111, extend to the outside of the side frame 11 through opening 112. The second pipe 32 extends back into the side frame 11 through opening 113 and extends towards the front of the vehicle through opening 121 formed in the front frame 12, connecting to the front nozzle 251. The fourth pipe 34 also extends back into the side frame 11 through opening 114 and extends towards the rear of the vehicle, connecting to the rear nozzle 252. As shown in Figure 3, a cover 13 with an openable and closable door 14 is attached to the side frame 11, and the opening 112 is located opposite the door 14. This allows workers to easily attach and detach the third pipe 33 and the fourth pipe 34 to and route them through the door 14 and opening 112.

[0025] Here, as shown in Figure 7, the filter 24 is configured to extend inclined outward from its upper end 241 to its lower end 242 in the normal position P1. If the filter 24 were to be positioned to extend vertically, the second pipe 32 would move further inward, as schematically shown by the dashed line, which could lead to excessive bending stress or insufficient length of the second pipe 32. To resolve this, if the filter 24 is positioned further outward, the connection points of the third pipe 33 and the fourth pipe 34 would move outward. As a result, as schematically shown by the dashed line, the third pipe 33 and the fourth pipe 34 would extend in a crank shape, which could generate large bending stress. In this embodiment, by making the filter 24 extend inclined, the length and bending stress of each pipe 30 can be appropriately set and arranged. Furthermore, the lower end 242 of the filter 24 in the normal position P1 can be easily positioned above the minimum ground clearance H1.

[0026] Next, the maintenance position P2 will be described. As shown in Figure 3, a mounting recess 60 is formed at the lower end of the side frame 11 near the opening 111. The mounting recess 60 is recessed in a rectangular shape from the outer surface of the side frame 11 toward the inside. The mounting recess 60 is provided at equal intervals with the fastening holes 41, and two fastening holes 61 are formed therein, through which two bolts B1 can be fastened. As shown in Figure 5, the filter 24 is fixed to the side frame 11 by fastening the two bolts B1 to the fastening holes 61 via through holes (not shown) with the mounting portion 50 in contact with the mounting recess 60 from the outside. This positions the filter 24 at the maintenance position P2. As shown in Figure 6, the maintenance position P2 is set so that the lengths of the second pipe 32, third pipe 33, and fourth pipe 34 are not insufficient and the position is within a range of motion that does not generate excessive bending stress.

[0027] In this embodiment, the maintenance position P2 is set so that the filter 24 is located at the lowest point among the drainable parts of the spraying device 20. More specifically, as shown in Figure 6, the connection point between the filter 24 and the second pipe 32 (inlet port 24a) is located below the section from the switching valve 22 to the connection point. Also, the connection points between the filter 24 and the third pipe 33 and the fourth pipe 34 (first outlet port 24b and second outlet port 24c) are located below the section from the front nozzle 251 and the rear nozzle 252 to the connection points. In other words, the inlet port 24a, the first outlet port 24b, and the second outlet port 24c are located below the discharge port 23a of the pump 23 and each nozzle 25. Furthermore, the first pipe 31, the second pipe 32, the third pipe 33, and the fourth pipe 34 are arranged so that no curved sections (slack sections) are formed between them and the filter 24 where water may remain during draining operations. Furthermore, a drain section 24d is provided at the lower end of the filter 24. As a result, when the operator opens the drain section 24d, water remaining in the section from the switching valve 22 to the filter 24 and in the section from each nozzle 25 to the filter 24 is discharged through the drain section 24d of the filter 24, as shown by the white arrow in Figure 2.

[0028] As described above, the macadam roller (compaction machine) 1 according to the embodiment includes a spraying device 20 which includes a tank 21 for storing water (liquid), a pump 23 for pumping the liquid stored in the tank 21, a nozzle 25 for spraying the liquid pumped from the pump 23 onto the compaction wheel 15, a filter 24 for filtering the liquid supplied from the tank 21 to the nozzle 25, and piping 30 connecting the pump 23, the filter 24, and the nozzle 25. The filter 24 includes an inlet port 24a connected to the pump 23, a first outlet port (outlet port) 24b and a second outlet port (outlet port) 24c connected to the nozzle 25 through which filtered water flows in from the inlet port 24a and is discharged, and a drain section 24d that can discharge water remaining inside the filter 24 to the outside. The piping 30 includes a second pipe (input pipe) 32 connecting the discharge port 23a of the pump 23 to the inlet port 24a of the filter 24, and a third pipe (output pipe) 33 and a fourth pipe (output pipe) 34 connecting the first outlet port 24b and the second outlet port 24c of the filter 24 to the nozzle 25. The inlet port 24a is positioned below the discharge port 23a of the pump 23 during draining operations to discharge liquid from the drain section 24d, and the first outlet port 24b and the second outlet port 24c are positioned below the nozzle 25 during draining operations.

[0029] With this configuration, as described above, if the drain section 24d of the filter 24 is opened during draining, residual water between the discharge port 23a of the pump 23 included in the draining area and the filter 24, and between the nozzle 25 and the filter 24, can be discharged. As a result, there is no need to use a device to supply pressurized air to the draining area, thus preventing an increase in the number of parts and complexity of the device configuration. Furthermore, since there is no need to provide multiple drain sections in the circuit of the spraying device 20, the work of opening multiple drain sections is unnecessary, thus suppressing the complexity of the draining work. In addition, it is possible to prevent forgetting to open any of the drain sections. Moreover, since the drain section 24d is provided at the lower end of the filter 24, water inside the filter 24 can also be reliably discharged, eliminating the need to perform a separate water draining operation of the filter 24.Therefore, according to the macadam roller 1 of this embodiment, it is possible to reduce the burden on the draining work of the spraying device 20 with a simple configuration.

[0030] Furthermore, each nozzle 25 is positioned above the upper surface (upper end) 21a of the storage section of the tank 21. If each nozzle 25 were positioned below the upper surface 21a of the tank 21, there would be a risk of so-called dripping, where water from the tank 21 flows through the pipes 30 to the nozzles 25 and drips down while water spraying from each nozzle 25 is stopped. If dripping occurs from the nozzles 25 in this way, separate cleaning may be required, and a shut-off valve would be necessary between the tank 21 and each nozzle 25 to prevent dripping. In this embodiment, since each nozzle 25 is positioned above the tank 21, dripping can be suppressed without the need for a shut-off valve, and the device can be further simplified.

[0031] Furthermore, the tank 21 is positioned below the top 15t of the compaction wheel 15, and each nozzle 25 is positioned above the top 15t of the compaction wheel 15, but near the top 15t. Specifically, each nozzle 25 is positioned on the extensions of the centerlines L1 and L2 along the vertical direction of the compaction wheel 15. Here, Figure 8 is a side view showing the macadam roller tilted downwards towards the front. Figure 9 is a side view showing the macadam roller tilted downwards towards the rear. As shown, by positioning the front nozzle 251 and rear nozzle 252 above the compaction wheel 15 and near the top 15t, each nozzle 25 is more likely to be positioned above the upper surface 21a of the tank 21 even when the macadam roller 1 is tilted (see dashed line). Therefore, even if the posture of the macadam roller 1 changes, the occurrence of the aforementioned rearward sagging can be suppressed.

[0032] Furthermore, the filter 24 is mounted on the side frame (vehicle frame) 11 so that its position can be switched between a normal position P1, which is set above a predetermined minimum ground clearance H1 set in advance for the macadam roller 1, and a maintenance position P2, which is set below the minimum ground clearance H1. With this configuration, the minimum ground clearance can be ensured during normal operation of the macadam roller 1. Also, during drain work, the filter 24 can be positioned as low as possible among the parts to be drained. Moreover, the operator of the macadam roller 1 can easily see whether the filter 24 is in the normal position P1 or the maintenance position P2. As a result, it is possible to prevent the operator from operating the macadam roller 1 while the filter 24 is in the maintenance position P2.

[0033] Furthermore, when the filter 24 is positioned in the normal position P1, it is fixed in a position that is inclined outward in the vehicle width direction from its upper end 241 to its lower end 242. This configuration makes it easier to position the lower end 242 of the filter 24 above the minimum ground clearance H1 in the normal position P1.

[0034] This concludes the description of the embodiments, but the aspects of the present invention are not limited to these embodiments. For example, the configuration of the embodiment may be applied to compaction machines other than the macadam roller 1, such as vibratory rollers, tire rollers, and tamping rollers. Furthermore, the configuration of the embodiment is not limited to the spraying device 20, but may be applied to compaction machines equipped with a spraying device that sprays liquids other than water. A water shut-off valve may be provided in the circuit of the spraying device. It is particularly preferable to use a water shut-off valve when using liquids such as light oil, where it is desirable to more reliably prevent dripping.

[0035] Furthermore, in this embodiment, the filter 24 is detachably fastened to the side frame 11 with bolts B1, but the mounting structure of the filter 24 is not limited to this. For example, the side frame 11 may be provided with rails that allow the filter 24 to slide between a normal position P1 and a maintenance position P2, and the filter 24 may be attached to these rails. Also, if the minimum ground clearance H1 of the compaction machine can be secured, and the inlet port 24a of the filter 24 can be positioned below the discharge port 23a of the pump 23, and the first outlet port 24b and the second outlet port 24c can be positioned below the nozzle 25, it is not necessary to configure the filter 24 to be movable between the normal position P1 and the maintenance position P2. [Explanation of Symbols]

[0036] 1. Macadam roller (compaction machine) 11. Side frame (vehicle frame) 15 Compaction wheels 15t top 20 Spraying equipment 21 tanks 22 Switching valve 23 pumps 23a Discharge port 24 filters 24a Inflow Port 24b First Outflow Port (Outflow Port) 24c Second Outflow Port (Outflow Port) 24d Drain section 241 Upper end 242 Lower end 25 nozzles 251 Front Nozzle 252 Rear nozzle 30 Piping 31. First Piping 32. Second Piping 33 Third Piping 34. Fourth pipe 111, 112, 113, 114 opening H1 minimum ground clearance L1, L2 center line P1 Normal position P2 Maintenance Location

Claims

1. A tank for storing liquid, A pump for pumping the liquid stored in the tank, A nozzle for spraying the liquid pumped from the pump onto the compaction wheel, A filter for filtering the liquid supplied from the tank to the nozzle, Piping connecting the pump, the filter, and the nozzle, In a compaction machine equipped with a spraying device including, The filter includes an inlet port connected to the pump, an outlet port connected to the nozzle through which the filtered liquid flowing in from the inlet port is discharged, and a drain section capable of discharging any liquid remaining inside the filter to the outside. The piping includes an input pipe connecting the discharge port of the pump and the inlet port of the filter, and an output pipe connecting the outlet port of the filter and the nozzle. The inlet port is positioned below the discharge port of the pump when draining the liquid from the drain section. The outflow port is positioned below the nozzle during the draining operation. A compaction machine characterized by the following features.

2. The compaction machine according to claim 1, characterized in that the nozzle is positioned above the upper end of the storage section of the tank.

3. The nozzle is positioned above the top of the compaction wheel and near the top of the top. The compaction machine according to feature 2.

4. The compaction machine according to claim 1, characterized in that the filter is mounted on the vehicle frame so as to be able to switch between a normal position set above a predetermined minimum ground clearance and a maintenance position set below the minimum ground clearance.

5. The compaction machine according to claim 4, characterized in that when the filter is placed in the normal position, it is fixed in an inclined position from the upper end to the lower end.

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