Vibrator, construction machine and attachment

Abstract

To provide a technology for appropriately mounting an acceleration sensor on a vibrator for compacting concrete.SOLUTION: A vibrator for compacting fresh concrete includes a vibration body stored within an outer shell part of the vibrator and including a motor and an eccentric weight eccentrically connected to a rotating shaft of the motor, and an acceleration sensor stored within the outer shell.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present technology relates to a vibrator, a construction machine, and an attachment for compacting concrete. [Background technology]

[0002] A method for determining the compaction characteristics of fresh concrete has been proposed in the past (for example, in patent documents). This method determines the compaction characteristics of fresh concrete to be compacted by the steps of: determining the vibration acceleration and vibration angular velocity of a rod-shaped vibrator based on the current value of the rod-shaped vibrator; determining the fluid force acting on the rod-shaped vibrator using the vibration acceleration and vibration angular velocity; and determining the viscosity coefficient of the fresh concrete using the fluid force. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-169001 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of a vibrator operated by a DC motor, an approximation of the acceleration can be obtained by a relational expression for approximating the relationship between the current and the acceleration, etc. However, in order to estimate the acceleration for a different model of vibrator, it is necessary to use a dedicated relational expression, and it cannot be said that it is highly versatile. In other words, it is necessary to apply a known load to the vibrator in the certification test, measure both the acceleration and the current value, and obtain the relational expression, which is time-consuming. In addition, even if the model of the vibrator is the same, there are cases where the relational expression cannot be applied due to the influence of wear and deterioration of the motor, and there is also a problem that the relational expression cannot be applied if the supply voltage changes due to the insertion of a table tap or corner tap in the power supply to the vibrator.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and has a purpose to provide a technique for generally estimating the degree of progress of compaction of concrete by a vibrator. [Means for solving the problem]

[0006] (Aspect 1) A vibrator for compacting fresh concrete, a vibrating body that is housed within an outer shell of the vibrator and includes a motor and an eccentric weight that is eccentrically connected to a rotation shaft of the motor; An acceleration sensor housed within the outer shell portion; A vibrator comprising: (Aspect 2) The vibrator is rod-shaped, the outer shell portion includes a vibrator case in which the vibrator is housed, a sensor case in which the acceleration sensor is housed, and a tip portion; The sensor case is detachably connected between the vibration body case and the tip portion. 2. The vibrator according to claim 1. (Aspect 3) the acceleration sensor is connected to a cable including a signal line for outputting acceleration information; a cable molding for accommodating the cable along an extending direction of the vibrator, the cable molding being disposed outside an outer shell of the vibrator; The cable is routed from the acceleration sensor side through a through hole provided in a side surface of the sensor case and into the cable molding. 3. The vibrator according to claim 2. (Aspect 4) The through hole is sealed with the cable passing through it. 4. The vibrator according to embodiment 3. (Aspect 5) A vibrator according to any one of aspects 1 to 4; A base machine to which the vibrator can be attached and detached; Including construction machinery. (Aspect 6) connected to the acceleration sensor, The method further includes a computer that estimates the viscosity of the fresh concrete using data output by the acceleration sensor and determines the degree of progress of compaction according to the viscosity. 6. The construction machine according to claim 5. (Aspect 7) A detachable attachment for a vibrator for compacting fresh concrete, The vibration sensor is disposed between a vibration body portion of the vibrator that vibrates the vibrator and a tip end portion of the vibrator. attachment. Effect of the Invention

[0007] According to the present invention, a technique can be provided for generally estimating the degree of progress of compaction of concrete by a vibrator. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating an example of a construction machine. [Diagram 2] FIG. 2 is a perspective view for explaining the vibration portion. [Diagram 3] FIG. 3 is a perspective view of the tip portion of the vibration unit. [Figure 4] FIG. 4 is a vertical cross-sectional view of the tip portion of the vibrating part. [Diagram 5] FIG. 5 is a schematic cross-sectional view taken at the position of the through-hole. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that each configuration and their combinations in the embodiment are merely examples, and addition, omission, substitution, and other modifications of the configuration are possible as appropriate within the scope of the gist of the present disclosure. The present disclosure is not limited by the embodiment, but is limited only by the claims.

[0010] <Embodiment> Fig. 1 is a diagram showing an example of a construction machine. The construction machine 1 according to the embodiment is a construction machine used for compacting fresh concrete, and includes a base machine 2 and a vibrator 3. The base machine 2 is, for example, a hydraulic excavator, and includes a first arm 21 and a second arm 22. The vibrator 3 is a detachable attachment attached to the tip of the arm, and is connected to the second arm 22.

[0011] The vibrator 3 includes a mount 31, four vibration isolators 32 each having one end connected to the mount 31, a vibrating body 33 each having one end connected to the other end of the vibration isolator 32, and a vibration body 33. The vibrator 3 includes an adapter 34, one end of which is connected to the other end of the vibrator 3, and a cap 35, one end of which is connected to the other end of the adapter 34. That is, the vibrator 3 is an attachment having four rod-shaped vibration parts, each of which includes a vibrating body 33, an adapter 34, and a cap 35. The details of the vibration parts will be described later. The mount part 31 has, for example, a manifold-shaped pipe connected to the vibration parts, and holds the vibration parts. The number and arrangement of the vibration parts are not limited to those shown in the figure. The vibration isolation device 32 is, for example, an existing rubber vibration isolation device, and suppresses the transmission of vibration from the vibration parts to the mount part 31. The adapter 34 is a unit that houses an acceleration sensor in a case, and can be inserted between the vibrating body 33 and the cap 35. In addition, a wiring part 4 for wiring to the acceleration sensor is provided on the outside of each vibrating body 33.

[0012] The base machine 2 may also include a computer 5 for estimating the viscosity (viscosity coefficient) of concrete based on data obtained from the acceleration sensor and for determining the degree of progress of compaction. The computer is a general information processing device including a processor and a storage device. The computer 5 can estimate the viscosity coefficient of concrete from the acceleration and angular velocity, for example, by an existing method. The computer can also estimate the density of concrete (in other words, the degree of progress of compaction) according to the viscosity coefficient. The computer 5 may also back-calculate and output the time until compaction is completed, and update in real time according to the progress of compaction.

[0013] Fig. 2 is a perspective view for explaining the vibration part. In Fig. 2, components housed in the vibration part are shown by dashed lines. Fig. 3 is a perspective view of the tip part of the vibration part. Fig. 4 is a vertical cross-sectional view of the tip part of the vibration part.

[0014] As shown in FIG. 2, the vibrator 33 includes a vibrator case 331, a motor 332, an eccentric weight 333, and a cable 334. The vibrator case 331 is a cylindrical outer shell member extending from the base side (the arm side of the construction machine 1) of the vibrating part to the tip side, and houses the motor 332, the eccentric weight 333, and the cable 334. As shown in FIG. 4, the tip side of the vibrator case 331 may have a closing part 335 that closes the inside of the vibrator case 331. The motor 332 is, for example, a hydraulic motor, and rotates a rotation shaft that extends in the extension direction of the vibrating part. The eccentric weight 333 is a weight that is connected with its center of gravity eccentric to the rotation shaft of the motor 332. The cable 334 is, for example, a hydraulic cable, and supplies a working fluid to the motor 332. As described above, the vibrating body 33 vibrates when the motor 332 rotates the eccentric weight 333 inside the vibrating body case 331 .

[0015] 2 to 4, the adapter 34 includes an adapter case 341 and an acceleration sensor 342. The adapter case 341 is, for example, a cylindrical outer shell member made of metal, and houses the acceleration sensor 342. The acceleration sensor 342 measures acceleration and outputs a signal indicating the acceleration in each of the three axial directions. As shown in FIG. 4, the acceleration sensor 342 may be disposed in contact with the inner circumference of the adapter case 341, so that the acceleration sensor 342 is easily subjected to vibration of the vibrating body 33. In addition, a through hole 343 is provided on the side circumference surface of the adapter case 341, so that a cable connected to the acceleration sensor 342 can be inserted therethrough.

[0016] For example, the adapter 34 may be a device for mounting an acceleration sensor on a ready-made vibrator including the vibrating body 33 and the cap 35. For example, in a ready-made vibrator in which the vibrating body 33 and the cap 35 are screwed together, and the cap 35 is replaceable, the adapter 34 may be provided with a male thread portion and a female thread portion that screw together the vibrating body 33 and the cap 35, respectively. In the example of Fig. 4, the connection portion between the adapter 34 and the vibrating body 33 and the connection portion between the adapter 34 and the cap 35 are each sealed with a packing such as an O-ring 344. The adapter 34 may also be a device that can be connected to a ready-made vibrator by welding.

[0017] 2 to 4, cap 35 is a detachable outer shell member that protects the tip of the vibrating unit. Cap 35 is desirably made of a material that is more durable than vibrator case 331 and adapter case 341, and is preferably made by a manufacturing method that improves durability. In other words, the tip of the vibrator is particularly prone to wear with use, and only cap 35 can be replaced.

[0018] The wiring section 4 includes a cable 41, a cable molding 42, and a plurality of hose bands 43. The cable 41 is, for example, a cable harness, and includes a cable for supplying power to the acceleration sensor 342 and a cable for outputting an acceleration signal. The cable molding 42 is, for example, a metal cover, and forms a space for accommodating the cable 41 outside the vibrating section along the extending direction of the rod-shaped vibrating section. Note that, for convenience, in Figs. 2 to 4, the through hole 343 and the cable 41 are drawn so as to be visible, but the cable molding 42 may extend so as to cover the through hole 343. Fig. 5 is a schematic cross-sectional view cut at the position of the through hole 343. As shown in Figs. 3 to 5, the cable molding 42 includes a base section 421 and a round section 422. The base section 421 is disposed so as to be in contact with the outer periphery of the vibrating section. The round section 422 is curved in cross section so as to form a space for accommodating the cable between the base section 421 and the round section 422. In addition, in base portion 421 , a slit 4211 is formed at a position corresponding to through hole 343 provided in adapter case 341 .

[0019] Through hole 343 provided in adapter case 341 may be sealed with a predetermined filler after wiring of cable 41. Furthermore, in adapter case 341, acceleration sensor 342 and at least a part of cable 41 may be fixed with a filler.

[0020] According to the vibrator 3 as described above, the acceleration and angular velocity can be directly measured by the acceleration sensor 342. Also, the progress of compaction can be estimated from the acceleration and angular velocity by using existing methods. In particular, since the amplitude at the tip of the vibrating part is large, the estimation accuracy of the acceleration, etc. can be improved by mounting the acceleration sensor 342 on the adapter 34 that can be attached near the tip of the vibrating part. Also, by mounting the acceleration sensor 342 on the adapter 34 that can be attached and detached to an existing vibrator, it becomes easy to add the acceleration sensor 342 even when a construction machine 1 such as VIBACK (registered trademark) or a vibrator 3 such as its front assembly is used for rental or lease.

[0021] <Modification> The above-described embodiment is merely an example, and the present invention is not limited to the above-described configuration.

[0022] When the vibrator 3 has multiple vibration parts, at least some of the vibration parts may have the acceleration sensor 342. In this case, the other vibration parts may be fitted with an adapter 34 not equipped with the acceleration sensor 342, so that the lengths of the multiple vibration parts are adjusted.

[0023] Moreover, the acceleration sensor 342 may be a module that wirelessly transmits measurement data. In this case, a battery is mounted on the adapter 34 to supply power to the acceleration sensor 342, and the wiring section 4 can be omitted.

[0024] Furthermore, the acceleration sensor 342 may be mounted on the vibrating body 33 instead of the adapter 34. The acceleration and the like of the vibrating part can be measured even if the acceleration sensor 342 is disposed inside the vibrating body case 331 at a position that does not impede the rotation of the eccentric weight 333. In other words, if the acceleration sensor 342 is housed inside the outer shell part of the vibrator 3, the acceleration and the like can be measured while protecting the acceleration sensor 342. Note that the outer shell part refers to the vibrating body case 331, the adapter case 341, and the cap 35 of the vibrating part.

[0025] The acceleration sensor 342 may also be mounted inside the outer shell of a handheld vibrator.

[0026] The above-described embodiments and each modified example may be combined as much as possible and may be partially modified without departing from the objectives and technical ideas of the present disclosure. [Explanation of symbols]

[0027] 1: Construction machinery 2: Base machine, 21: First arm, 22: Second arm 3: vibrator, 31: mount, 32: vibration isolation device, 33: vibrator, 331: vibrator case, 332: motor, 333: eccentric weight, 334: cable, 335: blocking part, 34: adapter, 341: adapter case, 342: acceleration sensor, 343: through hole, 35: cap 4: Wiring section, 41: Cable, 42: Cable molding, 421: Base section, 4211: Slit, 422: Round section, 43: Hose band 5: Computer

Claims

1. A vibrator for compacting fresh concrete, a vibrating body that is housed within an outer shell of the vibrator and includes a motor and an eccentric weight that is eccentrically connected to a rotation shaft of the motor; An acceleration sensor housed within the outer shell portion; A vibrator comprising:

2. The vibrator is rod-shaped, the outer shell portion includes a vibrator case that houses the vibrator, a sensor case that houses the acceleration sensor, and a tip portion; The sensor case is detachably connected between the vibration body case and the tip portion.

2. The vibrator according to claim 1.

3. the acceleration sensor is connected to a cable including a signal line for outputting acceleration information; a cable molding for accommodating the cable along an extension direction of the vibrator, the cable molding being disposed outside an outer shell of the vibrator; The cable is routed from the acceleration sensor side through a through hole provided in a side surface of the sensor case and into the cable molding.

3. The vibrator according to claim 2.

4. The through hole is sealed with the cable passing through it.

4. The vibrator according to claim 3.

5. A vibrator according to any one of claims 1 to 4; A base machine to which the vibrator can be attached and detached; Including construction machinery.

6. connected to the acceleration sensor, The method further includes a computer that estimates the viscosity of the fresh concrete using data output by the acceleration sensor and determines the degree of progress of compaction according to the viscosity. The construction machine according to claim 5.

7. A detachable attachment for a vibrator for compacting fresh concrete, The vibration sensor is disposed between a vibration body portion of the vibrator that vibrates the vibrator and a tip end portion of the vibrator. attachment.

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