Device for suppressing bounce of mixer drum

Abstract

To suppress a malfunction caused by bouncing of mixer drum.SOLUTION: A device for suppressing bounce of a mixer drum 10 rotatably mounted on a mixer vehicle 100 includes a hydraulic damper 80 as an absorption unit that contracts when the mixer drum 10 contacts it while bouncing to absorb force applied by the mixer drum 10.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a device for suppressing bounce of a mixer drum. [Background technology]

[0002] Non-Patent Document 1 discloses a mixer vehicle equipped with a jump-up stopper for the drum. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] "MixAce Mixer Truck 4-8 ​​Ton Class," ShinMaywa Industries, Ltd., March 2023, p.3 Summary of the Invention [Problem to be solved by the invention]

[0004] The rear end of the mixer drum may bounce up when the mixer vehicle is traveling on mountain roads or unpaved roads. If the mixer drum bounces up, the mixer vehicle may receive a large impact, which may cause a malfunction of the mixer vehicle.

[0005] The present invention has been made in consideration of such problems, and has an object to suppress problems caused by the mixer drum bouncing up. [Means for solving the problem]

[0006] The present invention is a device for suppressing bounce-up of a mixer drum rotatably mounted on a mixer truck, characterized in that it includes an absorbing section that contracts when the mixer drum comes into contact with it while bouncing up, thereby absorbing the force applied from the mixer drum.

[0007] According to this invention, when the mixer drum bounces up, the absorbing portion in contact with the mixer drum contracts to absorb the force applied from the mixer drum, thereby suppressing problems caused by the mixer drum bouncing up.

[0008] The present invention is also characterized in that the absorption section is a shock absorber having a cylinder and a rod that is inserted into the cylinder so as to be able to move back and forth, and that contracts when the mixer drum bounces up and comes into contact with the rod, thereby generating a damping force.

[0009] According to this invention, the force applied from the mixer drum to the mixer vehicle due to the bounce can be sufficiently absorbed by utilizing the damping force of the shock absorber. Also, even if the force applied from the mixer drum to the mixer vehicle differs depending on the size of the mixer vehicle, such as whether it is large or small, it is easy to deal with this by simply changing the size of the shock absorber.

[0010] In addition, the present invention is characterized in that the shock absorber further has a roller rotatably mounted on the tip of the rod, and the rod is arranged so as to be able to contact the outer periphery of the mixer drum via the roller.

[0011] According to this invention, the rollers can deflect the rotation of the mixer drum that bounces up and comes into contact with the mixer drum during rotation, thereby preventing the mixer drum from being damaged.

[0012] In addition, the present invention is characterized in that the mixer truck has a support member that supports the shock absorber and a hopper into which ready-mixed concrete is poured and which guides the poured ready-mixed concrete into the mixer drum, and the support member supports the hopper from both the left and right sides of the vehicle.

[0013] According to this invention, since the shock absorber is provided on the support member that supports the hopper from both the left and right sides of the vehicle, it is possible to suppress the restriction of the opening degree of the hopper cover due to interference, compared to the case where a support member that supports the shock absorber at the center of the left and right direction of the vehicle is provided. Also, even if the shock absorber is provided in this way, it is possible to suppress the hopper from shifting through the support member, which causes an obstacle to the pouring of ready-mixed concrete, because the shock absorber absorbs the force from the mixer drum. Effect of the Invention

[0014] According to these inventions, problems caused by the mixer drum bouncing up can be suppressed. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a plan view of the mixer truck according to the embodiment of the present invention as viewed from the side. [Diagram 2] FIG. 4 is a diagram showing a hydraulic damper alone. [Diagram 3] FIG. 4 is a perspective view of a main portion showing the arrangement of a hydraulic damper. [Figure 4] FIG. 4 is a schematic diagram of a main portion showing the arrangement of hydraulic dampers when viewed from the rear of the mixer drum. [Diagram 5] FIG. 4 is a view showing a bracket of a hydraulic damper. [Figure 6] 13A and 13B are diagrams illustrating modified examples of the arrangement of the hydraulic damper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0017] First, the overall configuration of a mixer truck 100 according to an embodiment of the present invention will be described with reference to Fig. 1. The mixer truck 100 is a vehicle that transports so-called ready mixed concrete (hereinafter referred to as "ready mixed concrete") such as mortar or ready mixed concrete, and runs on the power of an engine (not shown). The driving source for running the vehicle may be, for example, a running motor or an engine and a running motor. In the following description, a case where the mixer truck 100 is loaded with ready mixed concrete will be described.

[0018] As shown in FIG. 1, the mixer truck 100 includes a driver's cab 1, a stand 2 extending in the fore-and-aft direction of the vehicle, a mixer drum 10 rotatably mounted on the stand 2, a drum drive unit 20 that drives and rotates the mixer drum 10, a hopper 30 into which ready-mixed concrete is added from outside and which guides the added ready-mixed concrete into the mixer drum 10, and a chute 40 that guides the ready-mixed concrete discharged from the mixer drum 10 to a predetermined position.

[0019] The mixer drum 10 is a cylindrical container that rotates around a rotation axis C1. An opening 10a through which fresh concrete is charged and discharged is provided at the rear end of the mixer drum 10 on the rear side of the vehicle, and a drive shaft 11 extending outward along the rotation axis C1 is provided at the front end on the front side of the vehicle. The mixer drum 10 is supported by the frame 2 with the rear end side where the opening 10a is provided being raised higher than the front end side.

[0020] The drive shaft 11 of the mixer drum 10 is connected to a drum drive device 20. The drum drive device 20 includes a drive source and a reducer (not shown), and the drive shaft 11 of the mixer drum 10 is connected to the drive source via the reducer. The drive source may be, for example, an electric motor or a hydraulic motor, and the mixer drum 10 is rotationally driven in a forward or reverse direction by the drive source.

[0021] A pair of blades 12, 13 are arranged in a spiral shape along the inner wall surface of the mixer drum 10. Each blade 12, 13 is divided into a front blade 12a, 13a arranged on the front side of the vehicle and a rear blade 12b, 13b arranged on the rear side of the vehicle at the approximately middle part of the mixer drum 10. Each rear blade 12b, 13b is joined to the inner wall surface of the mixer drum 10 at the opening 10a and joined to a cylindrical seal pipe 14 arranged on the rotation axis C1 line of the mixer drum 10. The seal pipe 14 is provided to smoothly guide the fresh concrete charged into the hopper 30 into the inside of the mixer drum 10. The seal pipe 14 is inserted into the opening 10a of the mixer drum 10 and the opening 30a of the hopper 30 connected to the opening 10a via rubber (not shown), and seals the opening 10a and the opening 30a.

[0022] The hopper 30 is disposed above the opening 10a of the mixer drum 10 in order to guide the ready mixed concrete charged from above the mixer vehicle 100 into the mixer drum 10 through the seal pipe 14. A hopper cover 31 that covers the opening of the hopper 30 is provided on the upper part of the hopper 30 so as to be rotatable via a hinge 31a. Meanwhile, a chute 40 is disposed below the opening 10a of the mixer drum 10 to guide the ready mixed concrete discharged from the mixer drum 10 to a predetermined position.

[0023] The mixer truck 100 has three operating states of the mixer drum 10: a stirring state in which the mixer drum 10 is rotated at a first rotation speed to stir the ready-mixed concrete in the mixer drum 10, a kneading state in which the mixer drum 10 is rotated at a second rotation speed faster than the first rotation speed to knead the ready-mixed concrete in the mixer drum 10, and a discharge state in which the mixer drum 10 is rotated in the opposite direction to the stirring and kneading states to discharge the ready-mixed concrete from an opening 10a.

[0024] In the mixing state, the mixer drum 10 is driven to rotate in a forward direction, which is a counterclockwise direction when viewed from the rear of the vehicle. In the mixing state, the blades 12, 13 rotate forward together with the mixer drum 10, so that the ready-mixed concrete in the mixer drum 10 moves to the front of the mixer drum 10 while being mixed. By rotating the mixer drum 10 in this way to mix the ready-mixed concrete, separation of the ready-mixed concrete is suppressed.

[0025] In the kneading state, the mixer drum 10 is rotated in the forward rotation direction at a second rotation speed that is faster than the first rotation speed of the mixer drum 10 in the agitating state. The kneading state is performed to knead the ready-mixed concrete before discharging it.

[0026] In the discharging state, the mixer drum 10 is driven to rotate in the reverse direction. In the discharging state, the blades 12, 13 rotate together with the mixer drum 10, so that the ready-mixed concrete moves to the rear of the mixer drum 10 while being agitated. By rotating the mixer drum 10 in the reverse direction in this manner, the ready-mixed concrete can be discharged from the opening 10a of the mixer drum 10. The ready-mixed concrete discharged from the opening 10a of the mixer drum 10 is guided to a predetermined position via the chute 40.

[0027] A frame 50 is provided at the rear end of the pedestal 2. The frame 50 includes a base portion 51 provided on the pedestal 2, and a frame portion 52 erected on the base portion 51. The base portion 51 is provided with drum rollers 60 (see FIG. 4) that roll on and contact the ring-shaped rail 15 of the mixer drum 10. The frame portion 52 has extension portions 52a extending upward from both ends of the base portion 51 in the left-right direction of the vehicle, and a detour portion 52b that passes behind the mixer drum 10 and detours around the mixer drum 10, connecting the upper portions of the extension portions 52a.

[0028] A support frame 70 is erected on the upper part of the frame part 52. The support frame 70 is a support member that supports a hydraulic damper 80, which will be described later, and is composed of a frame member and located in front of the hopper 30. The support frame 70 has a gate-like shape and is fixed to both ends of the upper part of the frame part 52 in the left-right direction of the vehicle so as to straddle the mixer drum 10. On the upper part of the support frame 70, a hydraulic damper 80 is installed as an absorption part and a shock absorber that contracts when the mixer drum 10 comes into contact with the support frame 70 while bouncing up, and absorbs the force applied from the mixer drum 10. Instead of the hydraulic damper 80 as an absorption part, a spring, a cushion member, or the like may be used, and instead of the hydraulic damper 80 as a shock absorber, a gas damper, or the like may be used. The hydraulic damper 80 is configured as follows.

[0029] 2 is a diagram showing a hydraulic damper 80 by itself. The hydraulic damper 80 includes a cylinder tube 81, which is a cylinder, and a piston rod 82, which is a rod inserted into the cylinder tube 81 so as to be capable of moving forward and backward. In the hydraulic damper 80, two chambers (not shown) are partitioned inside the cylinder tube 81 by a piston (not shown) connected to the piston rod 82, and a damping force is generated by providing resistance to the flow of working fluid between the two chambers. The hydraulic damper 80 contracts as the piston rod 82 retreats relative to the cylinder tube 81, thereby generating a damping force.

[0030] The hydraulic damper 80 further includes a roller 83 rotatably provided on the tip 82a of the piston rod 82, and a support shaft 84 rotatably supporting the roller 83. The tip 82a of the piston rod 82 is bifurcated, and the roller 83 is rotatably provided between the bifurcated tip 82a via the support shaft 84. The tip 82a does not have to be bifurcated, and the roller 83 may be rotatably provided on the tip 82a by being supported in a cantilever manner on the tip 82a. The hydraulic damper 80 is arranged in the mixer vehicle 100 as follows.

[0031] FIG. 3 is a perspective view of the main part showing the arrangement of the hydraulic damper 80. FIG. 4 is a schematic diagram of the main part showing the arrangement of the hydraulic damper 80 from the rear of the mixer drum 10. FIG. 5 is a diagram showing a bracket 90 of the hydraulic damper 80. As shown in FIG. 3, two hydraulic dampers 80 are provided at the center of the upper frame 70a extending in the vehicle left-right direction of the angular support frame 70. As shown in FIG. 1, the hydraulic damper 80 is provided on the upper frame 70a via the bracket 90 so that the roller 83 rotates along a plane perpendicular to the rotation axis C1. For this reason, the hydraulic damper 80 is provided in an inclined position so that the tip side is located rearward from the base end side on the opposite side in the extension / retraction direction. The hydraulic damper 80 does not necessarily have to be provided so that the roller 83 rotates along a plane perpendicular to the rotation axis C1, and can be provided so as to be extendable and retractable in accordance with the movement of the mixer drum 10 when the mixer drum 10 jumps up, for example, by providing the extension / retraction direction along the vertical direction.

[0032] As shown in Figures 1 and 3, an end ring 16 is formed by two rib-shaped annular protrusions at the outer periphery rear end of the mixer drum 10. The upper frame 70a is located behind the rail 15, and the hydraulic damper 80 is installed on the front surface of the upper frame 70a via a bracket 90, so that the roller 83 is disposed adjacent to the end ring 16 from the front. The roller 83 is disposed so as to come into contact with the outer periphery of the mixer drum 10 when the mixer drum 10 is supported by the drum roller 60 (see Figures 1 and 4). The mixer drum 10 is supported by the drum roller 60 when placed on the drum roller 60.

[0033] The mixer drum 10 bounces up in an arc shape centered on a fulcrum P (see FIG. 1) on the drum drive device 20 side, and the amount of movement of the mixer drum 10 when it bounces up increases as the position from the fulcrum P along the extension direction of the rotation axis C1 increases. For this reason, the hydraulic damper 80 is installed as described above so that the piston rod 82 contacts the rear portion of the mixer drum 10 (for example, the portion rearward of the rail 15). This makes it easier to adjust the hydraulic damper 80 compared to a case in which the hydraulic damper 80 is installed in the front portion of the mixer drum 10 (the portion on the drum drive device 20 side), which moves a smaller amount when it bounces up.

[0034] As shown in FIG. 5, the bracket 90 includes a holder portion 90a for holding the cylinder tube 81 of the hydraulic damper 80, a fixed portion 90b fixed to the support frame 70, and a connecting portion 90c for connecting the holder portion 90a and the fixed portion 90b. The holder portion 90a is structured by fixing a plurality of metal round bars 90aa bent to fit the outer circumference of the cylinder tube 81 to a base metal fitting 90ab, and holds the cylinder tube 81 at the portion of the plurality of metal round bars 90aa. The base metal fitting 90ab has a U-shaped cross section, and the plurality of metal round bars 90aa are fixed to the tip of the base metal fitting 90ab by welding or the like via an installation member (not shown) such as an iron plate. An insertion hole 90ac for inserting the connection portion 90c is provided on the back of the base metal fitting 90ab, and the tip of the connection portion 90c inserted into the insertion hole 90ac is fixed to the installation member by welding or the like. The connecting portion 90c is bent downward from the fixing portion 90b and connected to the holder portion 90a, thereby providing the hydraulic damper 80 in an inclined position. The fixing portion 90b is fixed to the support frame 70 by welding or the like. Therefore, the cylinder tube 81 is fixed to the support frame 70 via the bracket 90.

[0035] In this embodiment, the jump-up suppression device for the mixer drum 10 rotatably mounted on the mixer vehicle 100 includes a support frame 70, a hydraulic damper 80, and a bracket 90, and suppresses the jump-up of the mixer drum 10. According to this jump-up suppression device, when the mixer drum 10 jumps up, the hydraulic damper 80 as an absorbing part that comes into contact with the mixer drum 10 contracts to absorb the force applied from the mixer drum 10, so that defects caused by the jump-up of the mixer drum 10 can be suppressed. Examples of defects include parts being displaced due to the force transmitted from the mixer drum 10 that comes into contact while jumping up, and noise being generated when the mixer drum 10 comes into contact while jumping up.

[0036] In the device for suppressing bounce-up of the mixer drum 10, when the mixer drum 10 bounces up and comes into contact with the piston rod 82, the hydraulic damper 80 contracts to generate a damping force, absorbing the force applied from the mixer drum 10. Therefore, by utilizing the damping force of the hydraulic damper 80, the force applied from the mixer drum 10 to the mixer vehicle 100 due to the bounce-up can be sufficiently absorbed. Furthermore, since the device for suppressing bounce-up of the mixer drum 10 uses the hydraulic damper 80, even if the force applied from the mixer drum 10 to the mixer vehicle 100 differs depending on the size of the mixer vehicle 100, such as whether it is large or small, it is easy to deal with this by simply changing the size of the hydraulic damper 80.

[0037] In the device for suppressing the jumping up of the mixer drum 10, the hydraulic damper 80 is configured so that the piston rod 82 comes into contact with the mixer drum 10 via the roller 83, so that the rotation of the mixer drum 10 that jumps up and comes into contact with the mixer drum 10 during rotation can be deflected by the roller 83, thereby suppressing damage to the mixer drum 10.

[0038] The roller 83 may be disposed away from the outer periphery of the mixer drum 10 in a state in which the mixer drum 10 is supported by the drum rollers 60. In other words, the hydraulic damper 80 may be configured so that the piston rod 82 is disposed so as to be able to come into contact with the outer periphery of the mixer drum 10 via the roller 83. The roller 83 may also be disposed so as to be able to come into contact with the outer periphery of the mixer drum 10 at a position other than near the end ring 16.

[0039] The support frame 70 may be directly mounted on the frame 2. Furthermore, the bracket 90 may have a structure other than the structure described above. One hydraulic damper 80 may be disposed on the top of the mixer drum 10, or three or more hydraulic dampers 80 may be provided. That is, the hydraulic damper 80 may be one or more. The hydraulic damper 80 may be provided as follows.

[0040] FIG. 6 is a diagram showing a modified arrangement of the hydraulic damper 80. As shown in FIG. 6, the hydraulic damper 80 may be provided on a support frame 75 that supports the hopper 30. The support frame 75 is a support member that supports the hopper 30 from both the left and right sides of the vehicle, and also serves as a support member that supports the hydraulic damper 80. The support frame 75 is composed of a plurality of pipe-shaped frame members, L-shaped frame members, and the like. The support frame 75 is provided on both sides of the hopper 30 in the left-right direction of the vehicle, and is fixed at one end to a side portion of the hopper 30 in the left-right direction of the vehicle, and is fixed at the other end to a frame portion 52 located on the outer side of the hopper 30 in the left-right direction of the vehicle. A cylinder tube 81 of the hydraulic damper 80 is fixed to the support frame 75 via a bracket 95. The hydraulic damper 80 is disposed so that the piston rod 82 (see FIG. 2) can contact (in this example, is disposed in contact with) the outer periphery of the mixer drum 10 via the roller 83 by the bracket 95, and is provided in the same inclined posture as described above. Note that the bracket 95 of the hydraulic damper 80 on the right side in FIG. 6 is hidden behind the hydraulic damper 80.

[0041] In this example, the hydraulic damper 80 is provided on the support frame 75, eliminating the need for the support frame 70. Therefore, even when the hopper cover 31 is opened, there is no interference with the support frame 70 (see FIG. 1), and the hopper cover 31 can be opened wider. This prevents the hopper cover 31 from coming into contact with a building or the like when the mixer vehicle 100 is moved by mistake with the hopper cover 31 raised obliquely upward.

[0042] Even if the hydraulic damper 80 is provided on the support frame 75 supporting the hopper 30, when the mixer drum 10 bounces up, the force transmitted from the mixer drum 10 can be sufficiently absorbed by utilizing the damping force of the hydraulic damper 80. This makes it possible to prevent the hopper 30 from receiving an impact via the support frame 75 due to the mixer drum 10 bouncing up, thereby making it possible to prevent the hopper 30 from shifting and causing problems in the charging of ready-mixed concrete. In other words, if the hopper 30 shifts, problems may occur in the sealing properties of the seal pipe 14, so by preventing the occurrence of such problems, it is possible to prevent problems in the charging of ready-mixed concrete.

[0043] In this example, the hydraulic damper 80 is provided inside the existing support frame 75 in the left-right direction of the vehicle in order to arrange the rollers 83 near the end rings 16. As a result, the hydraulic damper 80 is not provided outside the hopper cover 31 of the hopper 30 in the left-right direction of the vehicle. For this reason, if the hopper cover 31 is opened widely, the hopper cover 31 will eventually interfere with the hydraulic damper 80.

[0044] Even in this case, the hopper cover 31 can be opened widely to the point where it interferes with the hydraulic damper 80. Moreover, by providing the hydraulic damper 80 in an inclined position as described above, the hydraulic damper 80 is less likely to interfere with the hopper cover 31. Therefore, even in this case, the hopper cover 31 can be opened widely compared to the case where the support frame 70 is provided, and it is possible to suppress limitations on the opening degree of the hopper cover 31 due to interference. In order to avoid interference between the hopper cover 31 and the hydraulic damper 80, for example, a stopper for the hopper cover 31 can be provided on the support frame 75.

[0045] The hydraulic damper 80 may be provided outside the hopper cover 31 in the left-right direction of the vehicle. This makes it possible to avoid interference between the hopper cover 31 and the hydraulic damper 80, and also makes it possible to fully open the hopper cover 31, for example, to open it wide just before it interferes with the mixer drum 10. This makes it possible to significantly prevent the hopper cover 31 from accidentally coming into contact with a structure or the like.

[0046] The configuration, operation, and effects of the embodiment of the present invention will be described below.

[0047] The bounce suppression device for the mixer drum 10 rotatably mounted on the mixer vehicle 100 includes a hydraulic damper 80 as an absorbing section that contracts when the mixer drum 10 comes into contact with the device while bouncing up, and absorbs the force applied from the mixer drum 10.

[0048] According to this configuration, when the mixer drum 10 bounces up, the hydraulic damper 80 as an absorbing part that comes into contact with the mixer drum 10 contracts to absorb the force applied from the mixer drum 10, thereby suppressing problems caused by the mixer drum 10 bouncing up.

[0049] The hydraulic damper 80 as an absorption section has a cylinder tube 81 and a piston rod 82 inserted into the cylinder tube 81 so as to be able to move back and forth, and is a shock absorber that contracts when the mixer drum 10 bounces up and comes into contact with the piston rod 82, thereby generating a damping force.

[0050] According to this configuration, the force applied from the mixer drum 10 to the mixer vehicle 100 due to the bounce can be sufficiently absorbed by utilizing the damping force of the hydraulic damper 80. In addition, even if the force applied from the mixer drum 10 to the mixer vehicle 100 differs depending on the size of the mixer vehicle 100, such as whether it is large or small, it is easy to deal with this by simply changing the size of the hydraulic damper 80.

[0051] The hydraulic damper 80 further includes a roller 83 rotatably provided on a tip portion 82 a of the piston rod 82 , and is configured so that the piston rod 82 as a rod is arranged so as to be able to come into contact with the outer periphery of the mixer drum 10 via the roller 83 .

[0052] According to this configuration, the rollers 83 can deflect the rotation of the mixer drum 10 that bounces up and comes into contact with the mixer drum 10 during rotation, thereby preventing the mixer drum 10 from being damaged.

[0053] The mixer vehicle 100 has a support frame 75 as a support member that supports the hydraulic damper 80, and a hopper 30 into which ready-mixed concrete is poured and which guides the poured ready-mixed concrete into the mixer drum 10, and the support frame 75 supports the hopper 30 from both the left and right sides of the vehicle.

[0054] According to this configuration, the hydraulic damper 80 is provided on the support frame 75 that supports the hopper 30 from both the left and right sides of the vehicle, so that it is possible to suppress the restriction of the opening degree of the hopper cover 31 due to interference, compared to a case where the support frame 70 that supports the hydraulic damper 80 at the center of the left and right sides of the vehicle is provided. Even if the hydraulic damper 80 is provided in this way, the hydraulic damper 80 absorbs the force from the mixer drum 10, so it is possible to suppress the hopper 30 from shifting via the support frame 75, which causes an obstacle to the charging of ready-mixed concrete.

[0055] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments. [Explanation of symbols]

[0056] 10 mixer drum, 30 hopper, 70 support frame (support member), 75 support frame (support member), 80 hydraulic damper (absorption section, shock absorber), 81 cylinder tube (cylinder), 82 piston rod (rod), 83 roller, 100 mixer vehicle

Claims

1. A device for suppressing a jump-up of a mixer drum rotatably mounted on a mixer vehicle, comprising: an absorbing section that contracts when the mixer drum comes into contact with the mixer drum while bouncing up, and absorbs the force applied from the mixer drum; A device for suppressing the jumping up of a mixer drum.

2. The mixer drum bounce suppression device according to claim 1, The absorbing unit is a shock absorber having a cylinder and a rod inserted into the cylinder so as to be capable of moving forward and backward, and contracts when the mixer drum bounces up and comes into contact with the rod, thereby generating a damping force. A device for suppressing the jumping up of a mixer drum.

3. The mixer drum bounce suppression device according to claim 2, The shock absorber further includes a roller rotatably provided on a tip portion of the rod, and the rod is configured to be in contact with an outer periphery of the mixer drum via the roller. A device for suppressing the jumping up of a mixer drum.

4. The device for suppressing a jump-up of a mixer drum according to claim 2 or 3, The mixer vehicle has a support member that supports the shock absorber, and a hopper into which the ready-mixed concrete is poured and which guides the poured ready-mixed concrete into the mixer drum, The support member supports the hopper from both the left and right sides of the vehicle. A device for suppressing the jumping up of a mixer drum.

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