JP3795368B2 - Underground agitator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground stirrer that is attached to, for example, an arm tip of a backhoe.
[0002]
[Prior art]
Conventionally, the following configuration is known as a ground improvement machine having an underground stirring function (Japanese Patent Laid-Open No. 8-144262). Here, as shown in FIG. 4, a drive shaft 55 that is rotationally driven is supported on an upper portion of a machine frame 54 attached to the tip of an arm 52 of a backhoe 51, and a drive sprocket 57 is attached to the drive shaft 55. A rotatable driven sprocket 60 is pivotally supported at the lower end of the machine casing 54, and an endless chain 61 is wound between the drive sprocket 57 and the driven sprocket 60. A plurality of stirring blades 62 are arranged on the outer peripheral surface of the chain 61. In this type of ground improvement machine, a hydraulic motor 63 was used as a drive source, and the agitating blade 62 arranged in a line with the chain 61 was circulated by the motor 63 to agitate soft ground.
[0003]
[Problems to be solved by the invention]
However, in the above prior art, since the large hydraulic motor 63 is cantilevered from the machine casing 54, it is disadvantageous in terms of strength, and the hydraulic motor 63 protruding from the machine casing 54 causes the mechanical It is difficult to increase the insertion depth. Furthermore, the stability of the machine is poor due to the weight balance on either the left or right side. In particular, this machine is often used by being attached to the end of an arm of a long reach backhoe, but if the stability of the machine is poor, the operability is affected.
[0004]
Therefore, it is possible to place the hydraulic motor above the drive sprocket and place it inside the machine frame.In that case, the drive system is connected by connecting the hydraulic motor and the drive sprocket with a separate chain. It was complicated (Japanese Patent Laid-Open No. 8-296219). With such an arrangement, the number of components increases, leading to an increase in cost.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an underground stirrer having a simple drive system and excellent stability.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a drive sprocket that is pivotally supported by an upper portion of a frame body attached to a base machine and driven by a motor, and a driven sprocket that is pivotally supported by the lower portion of the frame body and is rotatable. Endless chains, each provided with a plurality of stirring blades on the outer circumferential surface, are separately wound between the left drive sprocket and the left driven sprocket, and between the right drive sprocket and the right driven sprocket. In the underground agitator configured to agitate the ground with each agitating blade by the circulation of the chain, the left motor for driving the left drive sprocket and the right motor for driving the right drive sprocket are used as the motors. It is arranged so as to be symmetrical with respect to the center line.
[0007]
According to this configuration, as the motor, the left motor for driving the left drive sprocket and the right motor for driving the right drive sprocket are arranged so as to be symmetrical with respect to the center line of the frame body. Unlike the conventional example, the motor does not protrude greatly from the frame body, which is advantageous in terms of strength. Moreover, since the protrusion from a frame becomes small, the insertion depth of a machine will become deep.
[0008]
In addition, the left and right weight balance can be easily achieved by using a small motor having the same capacity on the left and right sides, and the stability of the machine is ensured. In particular, this machine is often used by being attached to the end of an arm of a long reach backhoe, but as a result of the stability of the machine being improved, the operability is also improved.
[0009]
Furthermore, in this configuration, the motor is connected to the drive shaft of the drive sprocket via a coaxial reduction mechanism, so that the drive system becomes simpler and the number of components is reduced compared to the case where a conventional chain is interposed. By doing so, the cost can be reduced.
[0010]
As in the invention described in claim 2, if a tensioning device that independently adjusts each tension is provided for each chain, appropriate adjustment is made to the elongation of the left and right chains, respectively. Since the impact on the left and right chains during agitation is absorbed in a timely manner, a right and left balanced drive becomes possible. In this case, there is no uneven load during stirring, and smooth stirring work can be performed.
[0011]
By the way, the structure of the stirring blade in the conventional machine is often complicated, and it is difficult to replace it when a part thereof is damaged. Therefore, as in the invention described in claim 3, if each stirring blade is constructed of an L-shaped member that is constructed between both chains and is formed so that one end side thereof stands upright with respect to the outer peripheral surface of the chain, The structure of the blade is simplified, and the agitating blade is fixed with a bolt so that it can be replaced for each stirring blade, thereby improving the maintainability.
[0012]
In addition, if each stirring blade is formed so as to form a vertical surface with respect to the circumferential direction of the chain, the agitation into the earth does not go well, and the stirring performance may be lowered. Therefore, as in the invention described in claim 4, if the surface on the one end side of each stirring blade is formed on an inclined surface that is tapered toward the circumferential direction of the chain, The bite into the earth and sand is improved and the stirring performance is improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1A and 1B are diagrams showing a configuration of an underground stirrer according to an embodiment of the present invention, in which FIG. 1A is a front view and FIG. 1B is a side view.
[0014]
As shown in FIGS. 1 (a) and 1 (b), in the underground agitator M according to the present embodiment, for example, it is pivotally supported on an upper portion of a frame 1 attached to an arm tip of a backhoe (base machine) (not shown), and Drive sprockets 3a and 3b driven by motors 2a and 2b and driven sprockets 4a and 4b that are pivotally supported at the lower portion of the frame 1 and are rotatable are provided on the left and right. Further, an endless chain in which a plurality of stirring blades 5, 5,... Are arranged on the outer peripheral surface between the left drive sprocket 3a and the left driven sprocket 4a and between the right drive sprocket 3b and the right driven sprocket 4b. 6a and 6b are wound separately, and are configured to stir the ground with the stirring blades 5, 5,... By the circulation of both chains 6a and 6b. The left motor 2a for driving the left drive sprocket 3a and the right motor 2b for driving the right drive sprocket 3b are arranged so as to be symmetrical with respect to the center line C in the width direction of the frame 1. It is characterized by that.
[0015]
The motors 2a and 2b are, for example, hydraulic motors, and use as a power source pressure oil supplied by hydraulic piping appropriately led from the backhoe body. The supply amount and supply direction of the pressure oil are switched by a control valve (not shown) in the hydraulic pipe, and this control valve is further controlled by operating an operation lever (not shown). The control valves of the motors 2a and 2b are operated simultaneously by the lever operation, so that their rotations are synchronized.
[0016]
The frame 1 has a symmetrical shape in the front-rear and left-right directions, and the upper part thereof is a box-shaped support 1d that supports the motors 2a, 2b, the speed reducers 2c, 2d, and the drive sprockets 3a, 3b. ing. Above that, eyepieces 1c, 1c that can be attached to the arm are juxtaposed, and below that, hollow guide portions 1a, 1b for guiding the chains 6a, 6b are hung left and right.
[0017]
The chain 6a, 6b is a roller chain composed of a roller link and a pin link, and the pin link is bent in an L shape on the left and right sides so as to fix the stirring blades 5, 5,. It has become. In the lower ends of the guide portions 1a and 1b, tension devices 7a and 7b for adjusting the respective tensions independently are provided for the respective chains 6a and 6b.
[0018]
2A and 2B are diagrams showing the configuration of the tensioning device, where FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a cross-sectional view taken along line AA in FIG. Since the left and right tensioning devices 7a and 7b have the same configuration, only the left tensioning device 7a will be described below.
[0019]
As shown in FIGS. 2A to 2C, the tensioning device 7a is provided at the lowermost end side of the guide portion 1a and is slidably provided in the guide portion 1a. For example, the left driven sprocket 4a It consists of a lower frame 71 that pivots, an upper frame 72 that is constructed slightly above the lower end side of the guide portion 1a, and a spring-type shock absorber 73 that is disposed between the frames 71 and 72. Although not clearly shown in the figure, the lower frame 71 is provided with an adjustment mechanism capable of adjusting the mounting height of the left driven sprocket 4a.
[0020]
Then, by pushing down the rotating shaft 74 of the left driven sprocket 4a that is rotatably fitted in the lower frame 71 with the spring force of the shock absorber 73, the chain 6a is tensioned so that the chain does not fall off the sprocket. The shock force applied to the chain during agitation is absorbed. By providing the right and left separate tensioning devices 7a and 7b in this way, the left and right balanced chain drive can be achieved. In this case, the uneven load at the time of stirring is eliminated and smooth stirring work can be performed.
[0021]
By the way, the structure of the stirring blade in the conventional machine is complicated, and it is difficult to replace it when a part thereof is damaged. Therefore, in the present embodiment, high-strength steel (so-called high-tensile material) is used for each of the stirring blades 5, 5,... To improve durability, and the chain is installed between the chains 6a and 6b. It is comprised from the L-shaped member formed so that the one end side 5a might stand upright with respect to the outer peripheral surface of 6a, 6b (refer FIG.1 (b)). The width dimension in the left-right direction is slightly larger than the maximum width between the guide portions 1a and 1b of the frame 1.
[0022]
In this way, the structure of the stirring blades 5, 5,... Is enlarged and simplified, and the stirring blades 5, 5,. Both the stirring performance and the maintainability can be improved by fixing and making it possible to replace each stirring blade 5, 5,. Since the rotations of the motors 2a and 2b are synchronized as described above, the chains 6a and 6b can be driven without being twisted with each other even if they are installed between the chains 6a and 6b. The force can be evenly received from side to side and transmitted to the stirring blades 5, 5,.
[0023]
However, if the one end side 5a of each of the stirring blades 5, 5,... Is formed on a surface perpendicular to the chains 6a, 6b, during the stirring, the biting into the earth and sand is not successful and the stirring performance is lowered. There is a fear. Therefore, in this embodiment, the surface of the one end side 5a of each of the stirring blades 5, 5,... Is formed as an inclined surface tapered toward the circumferential direction of the chains 6a, 6b. The biting into the earth and sand at the time is improved, and the stirring performance is further improved. In this embodiment, the inclination angle of the surface of the one end side 5a is set to about 45 ° with respect to the rotation direction, and in particular, when the chains 6a and 6b rotate in the clockwise direction, they can bite into the earth and sand and exhibit their stirring performance. It is like that.
[0024]
3A and 3B are views showing the operation of the underground stirrer, where FIG. 3A is a front view and FIG. 3B is a plan view.
[0025]
As shown in FIG. 3 (a), first, the left and right motor sprockets 3a and 3b are rotationally driven by the left and right motors 2a and 2b while the ground agitator M is attached to the tip of the backhoe arm (not shown), whereby the chain 6a, It is inserted to a depth of 4 to 5 m from the ground while rotating 6b. As described above, the stirring blades 5, 5,... According to the present embodiment are easy to bite into the earth and sand, and can be smoothly inserted into the soft ground by the biting force. In the figure, G indicates the ground.
[0026]
And in order to stir a wide area | region, it is as follows. That is, in FIG. 3 (b), the underground stirrer M is first moved vertically (AA direction) to agitate the portion {circle around (1)}, and then the ground agitator M is moved laterally so as not to wrap the portion {circle around (1)}. Then, the portion {circle around (2)} is stirred by moving vertically (BB direction). After that, the underground stirrer M is moved laterally to the boundary line of the parts (1) and (2) and then moved vertically (CC direction), and the part (3) is stirred again, thereby repeatedly stirring. Next, the underground stirrer M is moved laterally so as not to wrap around the portion {circle around (2)} and then moved vertically (DD direction), thereby stirring the portion {circle around (4)}. By repeating the above, the predetermined area can be evenly stirred.
[0027]
As described above, according to the underground agitator M of the present embodiment, the left motor 2a that drives the left drive sprocket 3a and the right motor 2b that drives the right drive sprocket 3b are on the center line C of the frame 1. Since the motors 2a and 2b are arranged so as to be symmetrical with respect to the left and right sides, the motors 2a and 2b do not protrude significantly from the frame 1 as in the conventional example, which is advantageous in terms of strength. Moreover, since the protrusion from the frame 1 becomes small, the insertion depth of the machine becomes deep.
[0028]
In addition, since the small motors 2a and 2b having the same capacity on the left and right sides are used and the right and left weight balance is easily achieved, the stability of the machine can be ensured. In particular, this machine is often used by being attached to the end of an arm of a long reach backhoe, but as a result of the stability of the machine being improved, the operability is also improved.
[0029]
Furthermore, in the present embodiment, the motors 2a and 2b are connected to the drive shafts of the drive sprockets 3a and 3b via coaxial reduction mechanisms 2c and 2d, so that the drive system thereof is compared to the case where a conventional chain is interposed. It becomes simple and can reduce the cost by reducing the number of components.
[0030]
In the above embodiment, the underground stirrer attached to the arm tip of the backhoe has been described, but the scope of the present invention is not limited to this, for example, the underground agitator is suspended by a crane, etc. It can also be used on other construction machines.
[0031]
In the above embodiment, the left and right motors 2a and 2b are hydraulic motors, but may be electric motors or the like.
[0032]
【The invention's effect】
According to the present invention, as the motor, the left motor for driving the left drive sprocket and the right motor for driving the right drive sprocket are arranged so as to be symmetric with respect to the center line of the frame, Unlike the conventional example, the motor does not protrude greatly from the frame body, which is advantageous in terms of strength. Moreover, since the protrusion from a frame becomes small, the insertion depth of a machine can be deepened.
[0033]
Moreover, the left and right weight balance can be easily achieved by using a small motor having the same capacity on the left and right sides, and the stability of the machine can be ensured. In particular, this machine is often used by being attached to the end of an arm of a long reach backhoe, but as a result of the stability of the machine being improved, the operability is also improved. In this case, there is no uneven load during stirring, and smooth stirring work can be performed.
[0034]
Furthermore, in this configuration, the motor is connected to the drive shaft of the drive sprocket via a coaxial reduction mechanism, so that the drive system becomes simpler and the number of components is reduced compared to the case where a conventional chain is interposed. By doing so, the cost can be reduced.
[0035]
According to the second aspect of the present invention, it is possible to make appropriate adjustments to the elongation of the left and right chains, respectively, and the impact on the left and right chains during agitation is absorbed in a timely manner, so It is possible to perform excellent driving.
[0036]
According to the third aspect of the invention, the structure of the stirring blade can be simplified, and the maintainability can be improved by fixing the stirring blade with a bolt so that the stirring blade can be replaced by each stirring blade.
[0037]
According to the fourth aspect of the present invention, the biting into the earth and sand during stirring is improved, and the stirring performance can be improved.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing a configuration of an underground stirrer according to an embodiment of the present invention, where (a) is a front view and (b) is a left side view.
2A and 2B are diagrams showing a configuration of a tensioning device, in which FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a cross-sectional view taken along line AA in FIG.
FIGS. 3A and 3B are diagrams showing a state of stirring work by the stirrer, where FIG. 3A is a front view and FIG. 3B is a plan view;
FIG. 4 is a diagram showing a configuration of an example of a conventional geological improvement machine.
[Explanation of symbols]
M Underground stirrer 1 Frames 2a and 2b Left and right motors 3a and 3b Left-right drive sprockets 4a and 4b Left-right driven sprocket 5 Stirring blade 6 Chains 7a and 7b Tensioning device

Claims (4)

A drive sprocket that is pivotally supported by the upper part of the frame body attached to the base machine and driven by a motor, and a driven sprocket that is pivotally supported by the lower part of the frame body and is rotatable are provided on the left and right sides, and the left drive sprocket An endless chain with a plurality of stirring blades arranged on the outer circumferential surface is wound separately between the right and left driven sprockets, and between the right driven sprocket and the right driven sprocket. In the underground stirrer configured to stir the underground with
A ground agitator in which a left motor for driving a left drive sprocket and a right motor for driving a right drive sprocket are arranged so as to be bilaterally symmetric with respect to the center line of the frame as the motor. The underground stirrer according to claim 1, wherein a tension device for independently adjusting each tension is provided for each chain. The submerged agitator according to claim 1 or 2, wherein each agitating blade is an L-shaped member that is constructed between both chains and is formed so that one end side thereof stands upright with respect to the outer peripheral surface of the chain. 4. The underground stirrer according to claim 3, wherein a surface of the one end side of each stirring blade is formed in an inclined surface that is tapered toward a circumferential direction of the chain.

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