JP2021177057A - Cutting crusher and existing pipe crushing system - Google Patents

Abstract

To provide a cutting crusher with improved pressure that a crushing blade can withstand.SOLUTION: An existing pipe crusher is a cutting crusher that cuts and crushes an existing pipe laid underground, and comprises: a support member slidably supported in a first direction from a rear end to a tip of the cutting crusher and provided with a support surface having an inclination with respect to the first direction on the tip side; and a crushing blade provided on the tip side of the support member, having a blade portion and a supported surface provided on the opposite side of the blade portion, and switchable between an open state and a closed state by being rotatably supported at one end around a first rotation axis. When the support member is in a first position, the crushing blade is fixed in the open state by contact between the support surface and the supported surface, and when the support member is in a second position at the rear end of the cutting crusher than the first position, the crushing blade is in the closed state.SELECTED DRAWING: Figure 5A

Description

The present invention relates to a cutting crusher and an existing pipe crushing system.

Existing pipes such as water and sewage pipes currently laid in urban areas are becoming obsolete and dysfunctional due to the lapse of a long period of time since they were laid, and there is an increasing demand for renovation.

For example, Patent Document 1 describes an existing pipe crushing system for cutting and crushing an existing pipe laid in the ground, a digging machine for cutting and crushing the existing pipe and collecting a crushed material, and moving in the existing pipe. An existing pipe crushing system is disclosed which is possibly provided and has an existing pipe guide device for guiding the traveling direction of the excavator in a state where the rear end side is in contact with the tip end side of the excavator.

It is described that in the existing pipe guide device of this existing pipe crushing system, one end is rotatably connected to the existing pipe guide device and the other end has a crushing blade that can be opened and closed with respect to the existing pipe guide device.

Japanese Unexamined Patent Publication No. 2019-002166

In the existing pipe crushing system disclosed in Patent Document 1, when the crushing blade is in the open state, the back surface of the blade portion is supported by contacting with another member at one point.

However, according to such a configuration, the existing pipe can be crushed in the case of a hard polyvinyl chloride pipe or a concrete pipe, but in the case of an existing pipe having a hardness higher than these (for example, a ductile cast iron pipe). Is difficult to crush because the pressure acting on the crushing blade exceeds the pressure that the crushing blade can withstand.

An object of the present invention is to provide a cutting crusher in which the pressure that the crushing blade can withstand is improved.

One invention for achieving the above object is a cutting crusher that cuts and crushes an existing pipe laid in the ground, and slides in a first direction from the rear end side to the tip side of the cutting crusher. A support member that is movably supported and has a support surface that is inclined with respect to the first direction on the tip side, and a support member that is provided on the tip side of the support member and on the blade portion and the opposite side of the blade portion. A support member comprising a crushing blade that has a provided supported surface and one end of which is rotatably supported around a first rotating shaft to switch between an open state and a closed state. However, when it is in the first position, the crushing blade is fixed in the open state by the contact between the support surface and the supported surface, and the support member is closer to the rear end side of the cutting crusher than the first position. When in the second position, it is a cutting crusher in which the crushing blade is closed. Other features of the invention will be clarified by the description herein.

According to the present invention, it is possible to provide a cutting crusher in which the pressure that the crushing blade can withstand is improved.

It is a figure which shows an example of the existing pipe crushing system. It is sectional drawing explaining the structure of the cutting crusher. It is sectional drawing explaining the structure of the cutting crusher. It is sectional drawing explaining the crushing blade in a closed state. It is a front view explaining the crushing blade in a closed state. It is sectional drawing explaining the crushing blade in an open state. It is a front view explaining the crushing blade in an open state.

== Embodiment ==
<Existing pipe crushing system>
FIG. 1 is a diagram showing an overall outline of the existing pipe crushing system 1 of the present embodiment. The existing pipe crushing system 1 is a system for cutting and crushing the existing pipe EP starting from the starting shaft LS. In the existing pipe crushing system 1 of the present embodiment, it is possible to further lay a new pipe NP at a place where the existing pipe EP has been laid.

The existing pipe crushing system 1 of the present embodiment includes a cutting crusher 2 and a main pushing device 3. In the present specification, the direction from the rear end side to the front end side of the cutting crusher 2 is referred to as "first direction D". Further, when the term "tip side" is used, it means "tip side of the cutting crusher 2". Similarly, when referred to as "rear end side", it means "rear end side of cutting crusher 2".

The cutting crusher 2 is a device for cutting and crushing an existing pipe EP laid in the ground. In the present embodiment, as the existing pipe EP, a pipe having a hardness higher than that of a hard polyvinyl chloride pipe or a concrete pipe such as a ductile cast iron pipe is assumed.

The main pushing device 3 is a device for propelling the cutting crusher 2 by pressing the rear end portion of the cutting crusher 2 in the first direction D. The main pushing device 3 is arranged in the starting shaft LS.

<Configuration of cutting crusher>
The configuration of the cutting crusher 2 will be described with reference to FIGS. 2 to 5B. FIG. 2 is a cross-sectional view for explaining the configuration of the cutting crusher 2, and is a cross-sectional view of the crushing blade 21 in a closed state (described later). FIG. 3 is a cross-sectional view for explaining the configuration of the cutting crusher 2, and is a cross-sectional view of the crushing blade 21 in an open state (described later). FIG. 4A is a cross-sectional view illustrating the crushing blade 21 in the closed state. FIG. 4B is a view for explaining the crushing blade 21 in the closed state, and is a front view seen from the tip side of the cutting crusher 2. FIG. 5A is a cross-sectional view illustrating the crushing blade 21 in the open state. FIG. 5B is a view for explaining the crushing blade 21 in the open state, and is a front view seen from the tip side of the cutting crusher 2. Note that, in FIGS. 4A and 5A, only the crushing blade 21, the support member 22, and the hydraulic cylinder 241 of the cutting crusher 2 are shown.

As shown in FIG. 2, the cutting crusher 2 includes a housing 20, a crushing blade 21, a support member 22, a motor 23, a hydraulic system 24, and an existing pipe guiding roller 25.

The housing 20 is a member that constitutes the exterior of the cutting crusher 2. The housing 20 of the present embodiment is a member substantially axisymmetric with respect to the first axis X shown in FIGS. 2 to 5B. The first axis X is an axis parallel to the first direction D. Inside the housing 20, a rotary shaft Rx1 (described later) for supporting the crushing blade 21, a support member 22, a motor 23, and a hydraulic system 24 are provided. Further, an existing pipe guiding roller 25 is provided on the outside of the housing 20.

The crushing blade 21 is a member extending from one end to the other end. The crushing blade 21 is located near the tip of the cutting crusher 2 and is provided on the tip side of the support member 22 described later (FIGS. 2 and 3). A plurality of crushing blades 21 are provided. In this embodiment, four crushing blades 21 are provided. Each of the four crushing blades 21 has a flat plate portion 21a and a supported portion 21b.

The flat plate portion 21a is a member on a substantially flat plate, and is a member extending from one end to the other end. The flat plate portion 21a has a blade portion 21c. The blade portion 21c is a part of the peripheral edge of the flat plate portion 21a, and is provided from one end to the other end. The thickness of the blade portion 21c becomes thinner as it is closer to the peripheral edge.

The supported portion 21b is a member provided with a supported surface 21d, which will be described later. The supported portion 21b is freely rotatable around the third rotation axis Rx3. The third rotation shaft Rx3 is a rotation shaft fixed to the flat plate portion 21a. The axial direction of the third rotation axis Rx3 is perpendicular to the flat plate portion 21a.

The shape of the supported portion 21b is a prism having a side surface and a bottom surface. The height direction of the supported portion 21b is parallel to the third rotation axis Rx3. The shape of the outer circumference of the bottom surface of the supported portion 21b is composed of an arc and a chord. The arc here is a circular arc centered on the third rotation axis Rx3. The central angle of the arc is greater than 180 degrees. The chord here is a straight line connecting both ends of the arc. As a result, the supported portion 21b is provided with a supported surface 21d, which is a plane adjacent to the string, on the side surface thereof.

Here, when the crushing blade 21 is viewed from the direction of the third rotation axis Rx3 (FIGS. 4A and 5A), the supported surface 21d becomes a part of the outer circumference of the entire crushing blade 21. As a result, the supported surface 21d can come into contact with the support surface 220a of the support member 22, which will be described later.

One end of each of the four crushing blades 21 is rotatably supported around the first rotation axis Rx1. The first rotation shaft Rx1 is a rotation shaft fixed inside the housing 20. The first rotary shaft Rx1 is located near the tip of the cutting crusher 2 and is provided on the tip side of the support member 22 described later (FIGS. 2 and 3). The axial direction of the first rotation axis Rx1 is perpendicular to the first direction D.

When the crushing blade 21 is rotated around the first rotation axis Rx1, the distance between the other end of the crushing blade 21 and the first axis X changes accordingly. Thereby, each of the four crushing blades 21 can be switched between the open state and the closed state. Hereinafter, the open state and the closed state will be described.

The open state is a state in which the distance between the other end of the crushing blade 21 and the first axis X is larger than the radius of the existing pipe EP before crushing (FIG. 3).

When crushing the existing pipe EP, the cutting crusher 2 first stops the crushing blade 21 in a closed state. Next, the cutting crusher 2 shifts the crushing blade 21 from the closed state to the open state in the stopped state. By this transition from the closed state to the open state, the blade portion 21c of the crushing blade 21 comes into contact with the existing pipe EP, and a part of the existing pipe EP is further crushed. Next, the cutting crusher 2 propels the crushing blade 21 along the existing pipe EP while transitioning from the open state to the closed state. By repeating this, the cutting crusher 2 crushes the existing pipe EP.

As can be seen from FIGS. 4B and 5B, the four crushing blades 21 are provided so as to be rotationally symmetric with respect to the first axis X four times. When the number of crushing blades 21 is n (n ≧ 2), it is preferable that the crushing blades 21 are provided so as to be rotationally symmetric n times with respect to the first axis X.

The support member 22 is a member for switching the crushing blade 21 into an open state or a closed state. The support member 22 is slidably supported by the hydraulic cylinder 241 described later in the first direction D or in the direction opposite to the first direction D.

The support member 22 will be described in detail with reference to FIGS. 4A and 5A. The support member 22 has a support portion 220, a sliding portion 221 and a connecting portion 222.

The support portion 220 is provided on the tip end side of the support member 22. The support portion 220 is provided with a support surface 210a. The support surface 220a is a plane having an inclination with respect to the first direction D. The support portion 220 has a wedge-shaped shape due to the provision of such a support surface 220a.

Regarding the inclination of the support surface 220a, of the angles formed by the first direction D and the support surface 220a, the angle θ on the rear end side of the cutting crusher 2 may be an acute angle (an angle smaller than 90 degrees). .. In this embodiment, the angle θ is approximately 20 degrees.

If the angle θ is too close to 0 degrees, the distance between the other end of the crushing blade 21 and the first axis X is crushed even when the support member 22 is in the first position (described later). It may not be larger than the radius of the previous existing pipe EP (that is, it will not be in the open state), and the blade portion 21c may not be able to contact the existing pipe EP. On the other hand, if the angle θ is too close to 90 degrees, the component in the opposite direction of the first direction D becomes dominant in the pressure acting on the support surface 220a, so that the open state is established via the hydraulic system 24 (described later). The load of the motor 23 (described later) required to maintain the above is increased.

The support surface 220a is provided at a position facing the crushing blade 21. That is, in the present embodiment, the support surface 220a is provided at a position facing each of the four crushing blades 21 in the support member 22. Like the four crushing blades 21, the support portion 220 is rotationally symmetric with respect to the first axis X four times (not shown).

The sliding portion 221 is provided at the rear end portion of the support member 22. The sliding portion 221 has a cylindrical shape. The diameter of the sliding portion 221 is equal to the diameter of the hollow portion 241a of the hydraulic cylinder 241 described later.

The connecting portion 222 is a long member that connects the supporting portion 220 and the sliding portion 221. A support portion 220 is connected to one end side of the connection portion 222, and a sliding portion 221 is connected to the other end side. As a result, the support member 22 slides in the first direction D or in the direction opposite to the first direction D.

The relationship between the support member 22 and the crushing blade 21 will be described with reference to FIGS. 4A and 5A. The support member 22 is slidable between the first position and the second position. FIG. 5A shows a state in which the support member 22 is in the first position. The first position is the position on the most tip side in the slidable range of the support member 22. FIG. 4A shows a state in which the support member 22 is in the second position. The second position is the position on the rearmost end side in the slidable range of the support member 22.

When the support member 22 slides between the first position and the second position, the support surface 220a and the supported surface 21d of the crushing blade 21 are always in contact with each other. This is because the supported portion 21b of the crushing blade 21 can freely rotate with respect to the third rotation axis Rx3. That is, it is possible to maintain the angle of the supported surface 21d with respect to the first direction D at the angle (θ) of the support surface 220a with respect to the first direction D.

When the support member 22 is in the first position, the crushing blade 21 is fixed in the open state in a state where the support surface 220a and the supported surface 21d of the crushing blade 21 are in contact with each other (FIG. 5A). This prevents the crushing blade 21 from rotating in the closed state. At this time, the support surface 220a and the supported surface 21d of the crushing blade 21 are in contact with each other on a surface having a finite area. That is, in the open state, the total drag acting on the supported surface 21d by the supporting surface 220a is uniformly or substantially uniformly dispersed over the contacting surfaces.

When the support member 22 is in the second position, the crushing blade 21 is closed in a state where the support surface 220a and the supported surface 21d are in contact with each other (FIG. 4A). At this time, the position where the support surface 220a and the supported surface 21d come into contact with each other is closer to the tip of the support member 22 than in the open state (FIG. 5A). Therefore, at this time, the position where the support surface 220a and the supported surface 21d come into contact with each other is closer to the first axis X than in the open state.

The motor 23 is provided to generate power for driving the hydraulic pump 242, which will be described later.

The hydraulic system 24 is provided to convert the power obtained from the motor 23 into power for sliding the support member 22 in the first direction D or the opposite direction of the first direction D. The hydraulic system 24 includes a hydraulic tank 240, a hydraulic cylinder 241, a hydraulic pump 242, a hydraulic pipe 243, a switching valve 244, and a hydraulic control valve 245.

The hydraulic tank 240 is provided for storing the oil used by the hydraulic system 24. In the present embodiment, the hydraulic tank 240 is provided at the rear end portion of the motor 23.

The hydraulic cylinder 241 is provided to guide the sliding of the support member 22 in the first direction D or in the opposite direction of the first direction D.

The hydraulic cylinder 241 is a cylindrical member extending in the first direction D and has a hollow portion 241a (FIGS. 4A and 5A). Further, the hydraulic cylinder 241 has an opening 241b communicating with the hollow portion 241a on the tip end side (FIGS. 4A and 5A).

The relationship between the hydraulic cylinder 241 and the support member 22 will be described with reference to FIGS. 4A and 5A. The sliding portion 221 of the support member 22 is arranged in the hollow portion 241a of the hydraulic cylinder 241. The sliding portion 221 contacts the side surface of the hollow portion 241a and slides on the side surface of the hollow portion 241a. The support portion 220 of the support member 22 is arranged outside the hollow portion 241a and closer to the tip end side than the hollow portion 241a. The connecting portion 222 of the support member 22 comes into contact with the side surface of the opening 241b of the hydraulic cylinder 241 and slides on the side surface of the opening 241b.

In the hollow portion 241a, a first hydraulic chamber 241c (FIG. 5A) on the rear end side of the cutting crusher 2 and a second hydraulic chamber on the front end side of the cutting crusher 2 are provided by the sliding portion 221 of the support member 22. 241d (FIG. 4A) is formed.

The hydraulic pump 242 is provided to pump oil from the hydraulic tank 240 and supply the oil to the first hydraulic chamber 241c or the second hydraulic chamber 241d via the hydraulic pipe 243. The hydraulic pump 242 is driven by the power obtained from the motor 23.

The hydraulic pipe 243 is provided to supply oil to the first hydraulic chamber 241c or the second hydraulic chamber 241d, or to discharge the oil from the first hydraulic chamber 241c or the second hydraulic chamber 241d.

The switching valve 244 is provided to switch the direction of the oil flowing through the hydraulic pipe 243. The switching valve 244 switches between the first connection state and the second connection state. In FIGS. 2 and 3, the direction of the oil flowing through the hydraulic pipe 243 is indicated by an arrow. Here, the bidirectional arrows indicate that the direction of the oil flowing through the hydraulic pipe 243 can be switched by the switching valve 244.

The first connection state is a state for supplying oil to the first hydraulic chamber 241c and discharging the oil from the second hydraulic chamber 241d. When the switching valve 244 is switched to the first connected state, oil is supplied to the first hydraulic chamber 241c and the oil in the second hydraulic chamber 241d is discharged. Then, the pressure in the first hydraulic chamber 241c exceeds the pressure in the second hydraulic chamber 241d. As a result, the support member 22 slides toward the tip end side and reaches the first position. When the support member 22 reaches the first position, the crushing blade 21 is opened (FIGS. 5A and 5B).

The second connection state is a state for discharging oil from the first hydraulic chamber 241c and supplying oil to the second hydraulic chamber 241d. When the switching valve 244 is switched to the second connected state, the oil in the first hydraulic chamber 241c is discharged, and the oil is supplied to the second hydraulic chamber 241d. Then, the pressure in the first hydraulic chamber 241c is lower than the pressure in the second hydraulic chamber 241d. As a result, the support member 22 slides toward the rear end side and reaches the second position. When the support member 22 reaches the second position, the crushing blade 21 is closed (FIGS. 4A and 4B).

The hydraulic control valve 245 is provided to adjust the flow rate of oil flowing through the hydraulic pipe 243.

The existing pipe guiding roller 25 is a wheel that can freely rotate around the second rotation shaft Rx2. The second rotation shaft Rx2 is fixed to the surface of the housing 20 and is provided on the rear end side of the crushing blade 21. The axial direction of the second rotation axis Rx2 is perpendicular to the first direction D. The distance between the second rotation axis Rx2 and the first axis X is larger than the radius of the new pipe NP.

The inner peripheral surface of the existing pipe EP crushed by the crushing blade 21 comes into contact with the existing pipe guiding roller 25 as the cutting crusher 2 is propelled. Then, when the cutting crusher 2 is propelled with the inner peripheral surface of the crushed existing pipe EP in contact with the existing pipe guiding roller 25, the crushed existing pipe EP is larger than the diameter of the existing pipe EP before being crushed. Is also guided in the direction of increasing. At this time, due to the relationship between the second rotation axis Rx2 and the first axis X, the distance between the crushed existing pipe EP and the first axis X is larger than the radius of the new pipe NP. Become.

A plurality of existing pipe guiding rollers 25 are provided. In this embodiment, four existing pipe guide rollers 25 are provided. The existing pipe guiding roller 25 is provided so as to be rotationally symmetric with respect to the first axis X four times (not shown). When the number of the existing pipe guiding rollers 25 is n (n ≧ 2), it is preferable that the existing pipe guiding rollers 25 are provided so as to be rotationally symmetric n times with respect to the first axis X.

As described above, the cutting crusher 2 of the present embodiment is a cutting crusher 2 for cutting and crushing an existing pipe EP laid in the ground, from the rear end side to the tip side of the cutting crusher 2. A support member 22 slidably supported in the first direction D toward which the support member 22 is slidably supported and has a support surface 220a inclined with respect to the first direction D on the tip end side, and a support member 22 provided on the tip end side of the support member 22. The blade portion 21c and the supported surface 21d provided on the opposite side of the blade portion 21c are provided, and one end portion is rotatably supported around the first rotation axis Rx1 to open the state. A crushing blade 21 that can be switched to a closed state is provided, and when the support member 22 is in the first position, the crushing blade 21 is opened by contact between the support surface 220a and the supported surface 21d. When the support member 22 is fixed and is in the second position on the rear end side of the cutting crusher 2 from the first position, the crushing blade 21 is separated from the support surface 220a and the supported surface 21d. It becomes a closed state.

When the cutting crusher 2 crushes the existing pipe EP, the crushing blade 21 21c receives pressure from the existing pipe EP. At this time, the supported surface 21d of the crushing blade 21 receives a drag force from the supporting surface 220a of the supporting member 22. The crushing blade 21 is maintained in an open state by balancing the pressure received by the blade portion 21c from the existing pipe EP and the drag force received by the supported surface 21d from the support surface 220a. At this time, since the supported surface 21d and the supporting surface 220a are in contact with each other on a surface having a finite area, the total drag force is uniformly or substantially uniformly dispersed over the contacting surfaces. As a result, it is possible to prevent a drag force having a magnitude capable of breaking the crushing blade 21 from locally acting on one or a plurality of points in the supported surface 21d of the crushing blade 21. Therefore, it is possible to provide the cutting crusher 2 in which the pressure that the crushing blade 21 can withstand is improved.

Further, the cutting crusher 2 is provided on the rear end side of the crushing blade 21, and further includes an existing pipe guiding roller 25 for guiding the existing pipe EP crushed by the crushing blade 21 to a predetermined position. As a result, the crushed existing pipe EP is guided to a predetermined position, so that the new pipe NP can be laid without being affected by the crushed existing pipe EP.

Further, in the cutting crusher 2, a plurality of crushing blades 21 are provided. That is, the existing pipe EP is decomposed into the same number of crushed pieces as the number of crushing blades 21 and crushed. As a result, when laying the new pipe NP, it is possible to reduce the interference caused by the crushed existing pipe EP.

Further, in the cutting crusher 2, a plurality of existing pipe guiding rollers 25 are provided. As a result, the influence of the crushed existing pipe EP when laying the new pipe NP is further reduced.

The existing pipe crushing system 1 of the present embodiment includes the cutting crusher 2 and a main pushing device 3 for propelling the cutting crusher 2 by pressing the rear end portion of the cutting crusher 2 in the first direction D. , Equipped with. According to such an existing pipe crushing system 1, a larger force is applied to the first direction D as compared with the conventional existing pipe crushing system in which the cutting crusher is propelled by towing from the tip side of the cutting crusher. It can act and propel. As a result, the crushing blade 21 can apply even greater pressure to the existing pipe EP. Further, for the above reasons, the pressure that the crushing blade 21 can withstand is improved. Therefore, the range of hardness of the existing pipe EP that can be crushed is improved.

The above embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. Further, it is needless to say that the present invention can be changed or improved without departing from the spirit thereof, and the present invention includes an equivalent thereof.

1: Existing pipe crushing system 2: Cutting crusher 20: Housing 21: Crushing blade 21a: Flat plate part 21b: Supported part 21c: Blade part 21d: Supported surface 22: Supporting member 220: Supporting part 220a: Supporting surface 221 : Sliding part 222: Connection part 23: Motor 24: Hydraulic system 240: Hydraulic tank 241: Hydraulic cylinder 241a: Hollow part 241b: Opening 241c: First hydraulic chamber 241d: Second hydraulic chamber 242: Hydraulic pump 243 : Flood control pipe 244: Switching valve 245: Flood control control valve 25: Existing pipe guidance roller 3: Main pusher

Claims (5)

It is a cutting crusher that cuts and crushes existing pipes laid underground.
A support member that is slidably supported in a first direction from the rear end side to the tip side of the cutting crusher and is provided with a support surface that is inclined with respect to the first direction on the tip side.
It has a blade portion provided on the tip side of the support member and a supported surface provided on the opposite side of the blade portion, and one end portion is rotatably supported around a first rotation axis. By doing so, the crushing blade that can be switched between the open state and the closed state,
With
When the support member is in the first position, the crushing blade is fixed in the open state by contacting the support surface and the supported surface.
A cutting crusher in which the crushing blade is in the closed state when the support member is located at a second position on the rear end side of the cutting crusher with respect to the first position. The cutting crusher according to claim 1, further provided with an existing pipe guiding roller provided on the rear end side of the crushing blade and for guiding the existing pipe crushed by the crushing blade to a predetermined position. The cutting crusher according to claim 1 or 2, wherein a plurality of crushing blades are provided. The cutting crusher according to any one of claims 1 to 3, wherein a plurality of existing pipe guiding rollers are provided. The cutting crusher according to any one of claims 1 to 4 and
A main pushing device that propels the cutting crusher by pressing the rear end portion of the cutting crusher in the first direction.
Cutting and crushing system equipped with.

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