JP3322848B2 - Bearing structure of excavating kneading shaft in multi-shaft excavating kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure for an excavating kneading shaft in a multi-shaft excavating kneader, which comprises an integral bearing.

[0002]

2. Description of the Related Art In civil engineering work, a multi-axis excavating kneader is used for a water stopping soil retaining method and a water stopping wall method. This multi-axis excavating kneader is configured to rotate a plurality of excavating kneading shafts provided with excavating screw blades at the tip and a large number of kneading blades and moving blades above the extruding kneading shaft while maintaining a parallel state with each other. Is provided at a plurality of predetermined positions in the vertical direction, and a bearing band for preventing run-out is provided between the two position regulating flanges provided on the journal of the excavating kneading shaft at the binding portion. It is attached to the band fitting portion of the metal member fitted in an integrated manner via the metal member in a state of being relatively rotatable from both sides.

In the multi-axis excavating kneader, as shown in FIGS. 8 and 9, the metal member (6) has a cylindrical shape provided with engaging flanges (61) at both upper and lower ends thereof. It is divided into two parts in the radial direction, and further along the division surface, the fixing groove step (61)
a) is formed and the divided engagement flanges (6) are formed.
A fixing groove (61b) is formed by the fixing groove steps (61a) that are in contact with each other in a state where 1) is combined.

The metal member (6) is in a state in which fixing projections (51c) provided on two position regulating flanges (51b) of the excavating kneading shaft (5) are fitted in the fixing grooves (61b). It is fitted to the journal (51a).

Further, as shown in FIG. 9, a bearing band (7) is mounted on both sides of a journal (51a) of an excavating kneading shaft (5) via a metal member (6) so as to sandwich the same. The plurality of excavating and kneading shafts (5) are configured to control to rotate so as to maintain a parallel state with each other without causing deflection.

Therefore, in the conventional multi-shaft excavating and kneading machine, the excavating and kneading shaft (5) and the metal member (6) are rotated integrally in the excavating and kneading operation, and the metal member (6) and the bearing band are rotated. Since it slides on both contact surfaces with (7), the journal (51a) of the excavating kneading shaft (5) does not wear. On the other hand, the metal member (6) and the bearing band (7) are always in contact with each other, and are worn due to sliding of both contact surfaces during the excavation and kneading operation.

[0007]

However, during the actual excavation and kneading operation, since the metal member (6) and the bearing band (7) are both made of metal, iron powder is scattered due to wear. Further, there is a problem that vibration noise caused by sliding between metals is large, causing dust pollution and noise pollution in the vicinity of the construction site. In addition to the fact that the bearing band (7) is divided into two parts in the radial direction, It is heavy because it is made of metal, and the journal (51a) of the excavating kneading shaft (5)
There is a problem that it is difficult to perform a fitting operation with the boss.

Therefore, in order to solve such a problem, for example, Japanese Utility Model Registration No. 3010846 discloses that
The cylinder with the engaging flanges at both ends is divided into two parts in the same manner as before, except that the conventional metal member is not limited to rotating in a state integrated with the journal. There has been proposed a bearing structure of an excavating kneading shaft in a multi-shaft excavating kneader in which a member formed of a hard elastic body is used.

However, in the above proposal, since the bearing is formed of a hard elastic body, during the excavation and kneading operation, the vibration caused by the conventional sliding is absorbed by the hard elastic body, and the noise is reduced. Since there is no wear on the metal surfaces of the bearing band and journal on the other side of sliding, there is no scattering of iron powder, and the problem of dust pollution and noise pollution near the construction site can be solved. Similarly, since a shape in which a cylinder having engagement flanges at both ends is divided into two parts in the radial direction is applied, the material is changed from metal to a hard elastic body, and the weight is reduced. The fitting operation is still difficult and has drawbacks in handling.

[0010]

SUMMARY OF THE INVENTION According to the present invention, under the above-mentioned background, iron powder is not generated and scattered due to abrasion, noise is less generated from sliding parts, and excavation is performed. An object of the present invention is to provide a bearing structure of a drilling kneading shaft in a multi-shaft drilling kneader in which a bearing can be easily fitted to a kneading shaft.

The term "hinge portion" used in the present invention means that the thickness of the portion is relatively thinner than that of the corresponding portion, and the bending of the portion is easier than that of the corresponding portion. , Means an easily bendable portion.

In order to achieve the above object, the present invention relates to a multi-shaft excavating kneader, comprising: a bearing band for rotatably bundling an extruding kneading shaft; and a device provided between the bearing band and the excavating kneading shaft. The bearing is formed with an engagement flange at both upper and lower ends and a band fitting portion between the engagement flanges, and two position regulating flanges are spaced at a predetermined distance in the axial direction. Multi-axial excavation, which is configured to be fitted to the journal of the excavation kneading shaft provided in the above, and to be held in a cylindrical shape by the bearing band fitted to the band fitting portion of the bearing. In the bearing structure of the excavating kneading shaft in the kneading machine, the bearing has one cut portion formed by cutting the bearing parallel to the axis, and a hinge portion formed at a position substantially symmetrical with respect to the cut line. And the hinge Are formed at the upper and lower ends of the engagement flange on the outer peripheral side of the engaging flange, and have a substantially trapezoidal notch with a divergent cross section, and a hinge groove parallel to an axis provided on the surface of the band fitting portion. The gist of the bearing structure of the excavating kneading shaft in the multi-shaft excavating kneader is characterized in that the cutting portion is configured to be spread out and fitted to the journal of the excavating kneading shaft. .

A preferred embodiment of the present invention is Claim 2
As described in the above, both left and right wall surfaces of the cut portion and the hinge groove in the hinge portion are flat, the opening angle of the cut portion is 60 ° to 90 °, and the opening angle of the hinge groove is 60 °. The bearing structure of the excavation kneading shaft in the multi-axis excavation kneading machine according to claim 1, wherein the angle is about 120 °.

In another preferred embodiment of the present invention, as described in claim 3, the thickness of the bearing at the deepest part of the notch and the thickness of the bearing at the deepest part of the hinge groove are the same. Claim 1 or Claim 2
2 is a bearing structure of the excavating kneading shaft in the multi-shaft excavating kneading machine.

According to another preferred embodiment of the present invention, as described in claim 4, in the bearing, the cut surface of the cut portion is deviated from the radial direction of the bearing. A bearing structure for an excavating kneading shaft in a multi-shaft excavating kneader according to any one of claims 1 to 3.

As the hard elastic body used in the bearing of the present invention, polyurethane or thermoplastic elastomer can be applied, and in particular, molybdenum-containing urethane rubber is suitable in terms of abrasion resistance. The physical properties of the hard elastic body are hardness 60 to 90 (Shore hardness / D type), tensile strength 300 kgf / cm ² or more, elongation 100% or more,
Those having a Young's modulus of about 2000 to 3000 kgf / cm ² are preferable.

In the bearing structure of the excavating kneading shaft in the multi-shaft excavating kneader having the above-described structure, the bearing is formed of a hard elastic body. Therefore, during the excavating kneading operation, the vibration due to the sliding is absorbed by the hard elastic body and noise is generated. In addition, there is no wear on the metal surfaces of the bearing band and journal on the other side of the sliding, so that no iron powder is generated.

Further, the bearing is adapted to be held in a cylindrical shape by a journal of the excavating kneading shaft, and has one cut portion formed by cutting parallel to the axis thereof, and Since it has a hinge portion formed at a position substantially symmetrical with the axis and is integrally formed from a hard elastic body, it can be easily fitted to the journal of the excavating kneading shaft by pushing and expanding the cut portion. The bearing after use at the time of replacement is
It can be easily removed by performing the reverse operation of the fitting operation. Particularly, the fitting operation and the removing operation at a high working position can be performed easily and safely.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
The embodiment will be described with reference to the drawings.

FIG. 1A is a side view schematically showing a multi-shaft excavating kneader to which the bearing structure of the present invention is applied, FIG. 1B is a front view showing an excavating kneading shaft, and FIG. FIG. 3 is a partially cutaway enlarged view showing a relationship between the excavation kneading shaft and the bearing, FIG. 3 is a partially enlarged view showing a state of a binding portion of the excavation kneading shaft, and FIG.
FIG. 4 is a sectional view taken along line AA of FIG.

In FIG. 1A and FIG. 1B, a multi-shaft excavating kneader (1) has three excavating kneaders whose upper ends are connected to a multi-shaft device (1a) having a built-in rotary drive. A shaft (2) is provided.

The excavating kneading shaft (2) has an excavating screw blade (2a) at the lower end and a number of kneading blades (2b) above the excavating screw blade (2b).
And moving wings (2c) are provided alternately,
It is bundled in parallel at the binding part (2d) at the location.

As shown in FIGS. 3 and 4, each excavation kneading shaft (2) has a pair of flanges (22) for position control fixed at the binding portion (2d) with a journal (23) interposed therebetween. A bearing (3) is fitted to the journal (23), and a band fitting portion (3) sandwiched between engaging flanges (32) at both upper and lower ends of the bearing (3).
In (3), a bearing band (4) for preventing vibration is fitted from the front and back, and bound by bolts (41a). (41b) is a reinforcing rib.

In this case, the excavating kneading shaft (2) and the bearing (3), and the bearing (3) and the bearing band (4) are usually configured so as to be relatively rotatable. It is also possible to configure at least the excavation kneading shaft (2) and the bearing (3) in a state in which they cannot rotate relative to each other by the same means (not shown) as in the prior art.

FIG. 5 is a perspective view showing a typical embodiment of a bearing which is a main part of the present invention. The bearing (3) is formed of a substantially cylindrical body, and one cut portion (30) is formed in parallel with the axis of the bearing (3).
It is integrally formed from a hard elastic body having a hinge portion (31) formed at a position substantially symmetrical to the axis with respect to (0).

The cutting portion (30) is formed by cutting a portion of a cylindrical body having engaging flanges (32) at both upper and lower ends in parallel with the axis, and the hinge portion (31) is formed by cutting the upper and lower portions. On the outer peripheral surface side of the engaging flange (32) at both ends, cut portions (31a) each having a substantially trapezoidal shape with a divergent cross section are formed vertically, and the cut portions (31) are formed.
a) a band fitting portion (33) on a line connecting the central portions of a)
And a hinge groove (31b) parallel to the axis is formed.

Notch (31a) of the bearing (3)
Is that the left and right wall surfaces are substantially flat, and the opening angle (θ1)
Is set to 60 ° to 90 °. In this case, if the opening angle (θ1) is less than 60 °, it becomes difficult to push and expand the cutting portion (30), and it becomes difficult to fit each of the excavating and kneading shafts (2) to the journal (23). When the angle exceeds 90 °, the fitting operation is easy, but rather, the width of the cut portion (31a) is increased, and the band fitting portion (3
The sliding surface (32) of the engaging flange (32) adjacent to 3).
Since the area of a) is reduced, it is not preferable in terms of durability. Therefore, it is desirable that the opening angle (θ1) of the cut portion (31a) is in the range of 65 ° to 80 °.

The opening angle (θ2) of the hinge groove (31b) is set at 60 ° to 120 °. In this case, if the opening angle (θ2) is less than 60 °, it becomes difficult to push and spread the cutting portion (30), and it becomes difficult to fit the respective excavation kneading shafts (2) to the journal (23), If it exceeds 120 °, the hinge groove (31b)
The groove width of the hinge groove (31b) itself is no longer provided, and the forming of the hinge groove (31b) itself is troublesome. Therefore, the opening angle (θ2) is desirably in the range of 70 ° to 90 °.

Here, the reason why the cross-sectional shape of the cut portion (31a) is a substantially divergent trapezoidal shape will be described. In principle, the cross-sectional shape of the cut portion (31a) is the same as that of the hinge groove. Although it may be formed so as to be on the extension of (31b), as shown in FIG. 6, when the fitting operation to the journal (23) is performed, the cutting portion (30) is large to push and spread in the direction of the arrow. Since a force is required, a portion (w) having a small thickness and a long length in a portion not subjected to sliding wear with the bearing band (4) is replaced with a hinge portion (31).
Is provided to reduce the bending resistance of the cut portion (31a) and to reduce the force required for the above-mentioned spread.

The cut portion (31a) is provided with the hinge portion (31) of the engaging flange (32) for the above-mentioned reason.
At a position corresponding to the shape of the hinge groove (31b), and has a substantially trapezoidal shape symmetrical with respect to the center line with respect to the hinge groove (31b), and has a short side cut at least to the bottom of the hinge groove (31b). You. That is, the notch (31
The thickness of the bearing (3) at the deepest part of (a) becomes equal to the thickness of the bearing (3) at the bottom of the hinge groove (31b), the bending resistance of this part is reduced, and the journal of the bearing (3) as a whole is reduced. (23) The fitting operation to (23) can be made easy.

The dimensions of the main part of the bearing (3) used in the present invention vary depending on the type and scale of the excavating kneading shaft (2) of the multi-shaft excavating kneader (1) to be applied. Taking a shaft (2) having a diameter of 256 mm as an example,
The band fitting portion (33) has a thickness of 10 to 15 mm, the engaging flange (32) has a thickness of 35 to 45 mm, and the hinge groove (31).
The depth is set in the range of 3 to 5 mm and the length of the short side of the trapezoidal shape of the cut portion (31a) is 12 to 17 mm. In particular, if the thickness of the band fitting portion (33) and the thickness of the engagement flange (32) are each less than the above range, the service life due to abrasion is shortened. Although the period is extended, it is not preferable because the weight increases and the fitting operation to the journal (23) becomes difficult. If the depth of the hinge groove (31b) is less than the above range, the flexibility of the hinge portion (31) is reduced and the fitting work becomes difficult, and if the depth exceeds the above range, the journal (23).
There is a possibility that a local thin portion may be generated due to abrasion due to sliding with the above, and the portion may be broken by a crack or the like. Furthermore, if the length of the short side of the trapezoidal shape is less than the above range, the cut portion (3
This is not preferable because the bending resistance of 1a) increases. Therefore, it is desirable that each of the above dimensions is set within the above range.

FIG. 7 shows a modification of the present invention. That is, the bearing (3) is formed such that the plane direction of the cut surface of the cut portion (30) in the bearing (3) is deviated from the radial direction of the bearing (3). In this way, a gap caused by wear of the bearing (3) generated with time between the inner surface of the bearing (3) and the journal (23) or between the band fitting portion (33) and the bearing band (4). When the rotational kneading shaft (2) is abnormally vibrated due to the increase in the size of the rotary kneading shaft (2), the tightening of the bearing band (4) is increased so that both cut surfaces of the cutting portion (30) are cut. Can be shifted in the direction of the arrow so as to reduce the inner diameter of the bearing (3), and the gap can be corrected so as to narrow again.
The service life of the bearing (3) can be extended. In this case, the deviation angle is not particularly limited, but if it is too large, the angle of the cutting edge becomes sharp, and the portion concerned is rather damaged, which is not preferable. Therefore, preferably, the deflection angle is set to about 40 ° to 50 ° with respect to the radial direction.

In the above modification, when a new bearing (3) is mounted, a bearing band (s) is provided so that a gap (s) is provided between the front and rear bearing bands (4) shown in FIG. The shape of 4) is set in advance. In this case, if the initial gap (s) width is set to a width sufficient to correct the practical wear limit of the bearing (3), the gap between the journal (23) and the bearing band (4) is set. Correction of the generated gap can be made possible only by retightening the bolt (41a).

Example 1 A bearing (3) having the form shown in FIG. 5 was applied, and a material made of molybdenum-containing urethane rubber was prepared.

The shape of the bearing (3) has a height of 270 mm, an inner diameter of 256 mm, and an outer diameter of 280 at the band fitting portion (33).
mm, outer diameter of the engaging flange (32) part 320 mm, width of upper and lower engaging flanges (32) 32 mm, height 42 mm
The hinge part (31) provided at the axially symmetric position of the cutting part (30) has a notch (60) with an opening angle (θ1) of 60 ° at each of the upper and lower engaging flanges (32). 31a) and a hinge groove (31b) having a V-shaped cross section with a width of 10 mm and a depth of 3 mm provided on the surface of the band fitting portion (33) at an axially symmetric position of the cutting portion (30). And The length of the short side portion of the cut portion (31a) was 15 mm, and the thickness of the portion was 9 mm. That is, the thickness of the bearing (3) at the deepest part of the notch (31a) was the same as the thickness of the bearing (3) at the deepest part of the hinge groove (31b), and each was 9 mm.

A predetermined number of bearings (3) obtained as described above are applied to the respective cutting journals (23) of the excavating kneading shaft (2) in the multi-shaft excavating kneader (1) shown in FIG.
0) is pushed out and fitted, and as shown in FIGS. 3 and 4, the bearing band (4) is fitted to the band fitting portion (33).
Were fitted so as to sandwich them from the front and rear, and three excavation kneading shafts (2) were bound.

According to the first embodiment, the fitting of the bearing (3) to the journal (23) becomes extremely easy. Even after the fitting operation is released, the bearing (3) does not fall from the journal (23). After the fitting of the predetermined number of bearings (3) was completed, the bearing band (4) could be fitted and bound, and the mounting work could be performed extremely easily and safely.

In addition, even when the bearing (3) is removed after use, the bearing (3) can be easily and safely removed by performing the operation in the reverse order of the mounting operation.

Embodiment 2 FIG. 7 shows the cut portion (30) of the bearing (3) of Embodiment 1.
As shown in (1), a bearing (3) exactly the same as that of Example 1 was prepared except that the plane direction of the cut surface was formed at a deviation angle (θ3) of 45 ° with respect to the radial direction of the bearing (3). .

The plurality of bearings (3) obtained as described above are used in the same manner as in the first embodiment, and the journal (2) of the rotary kneading shaft (2) is used.
3) and bound with a bearing band (4).

According to the second embodiment, both the mounting operation and the replacement operation are exactly the same as those in the first embodiment, and the gap caused by wear after use over time is reduced by merely retightening the bolt (41a). Could be corrected.
As a result, there was no vibration of the rotary kneading shaft (2), and the service life could be extended.

[0042]

As described above, the bearing structure of the excavating kneading shaft in the multi-shaft excavating kneader of the present invention comprises a bearing band for rotatably bundling the excavating kneading shaft in the multi-shaft excavating kneader, and the bearing band. And a bearing made of a hard elastic body provided between the excavating and kneading shaft. The bearing has an engaging flange at both upper and lower ends and a band fitting portion between the engaging flanges. The position regulating flanges are fitted to journals of the excavating kneading shaft provided at predetermined intervals in the axial direction, and are held in a cylindrical shape by the bearing band fitted to the band fitting portion of the bearing. In the bearing structure of the excavation kneading shaft in the multi-shaft excavating kneader configured to be configured as described above, the bearing has one cut portion formed by cutting the bearing in parallel with the axis, and Formed at a position substantially symmetrical with the axis A hinge portion, and the hinge portion is provided on the outer periphery of the engaging flange at the upper and lower ends and has a substantially trapezoidal shape with a divergent cross-sectional shape, and is provided on the surface of the band fitting portion. And a groove for a hinge parallel to the axis of the shaft is formed, and the cut portion is configured to be pushed out and fitted to the journal of the excavating kneading shaft. During the excavation and kneading operation, the vibration caused by sliding is absorbed by the hard elastic body to reduce noise, and there is no wear on the metal surface of the bearing band and journal on the other side of sliding. Therefore, there is no generation of iron powder, and there is an effect of eliminating dust pollution and noise pollution near the construction site.

In particular, since the bearing is configured to be held in a cylindrical shape by the journal of the excavating and kneading shaft and is formed integrally, the fitting of the excavating and kneading shaft to the journal and the use after use are performed. There is an advantage that the detachment is easy, and particularly, the fitting operation and the detaching operation in the high working position can be easily and safely performed.

As described in claim 2, both the left and right walls of the notch and the hinge groove in the hinge portion of the bearing are flat, and the opening angle of the notch is 60 degrees.
° to 90 °, and the opening angle of the hinge groove is 60 ° to 12 °.
Since the angle is 0 °, the hinge portion is easily bent, and the operation of fitting the excavating and kneading shaft to the journal and the operation of removing it from the journal are further simplified.

Further, as described in claim 3, the thickness of the bearing at the deepest portion of the cut portion of the hinge portion is the same as the thickness of the bearing at the deepest portion of the hinge groove.
There is an advantage that the bending of the hinge portion is further facilitated, and the operation of fitting the excavating and kneading shaft to the journal and the operation of removing it from the journal are further simplified.

Further, as described in claim 4,
In the bearing, if the cut surface of the cut part is deviated from the radial direction of the bearing, the gap due to wear after use over time is corrected to narrow it by just retightening the bolt of the bearing band. This has the effect of preventing vibration of the rotary kneading shaft and has the economical advantage of extending the service life of the bearing.

[Brief description of the drawings]

FIG. 1 is an overall view showing a multi-shaft excavating kneader to which a bearing structure of the present invention is applied, FIG. 1 (a) is a side view schematically showing a multi-shaft excavating kneader, and FIG. It is a front view which shows the excavation kneading shaft of a shaft excavation kneading machine.

FIG. 2 is a partially cutaway enlarged view showing a relationship between a journal and a bearing of a drilling and kneading shaft in the bearing structure of the present invention.

FIG. 3 is a partially enlarged view showing a state of a binding portion of an excavating kneading shaft in the bearing structure of the present invention.

FIG. 4 is a sectional view taken along line AA of a binding portion of the excavating kneading shaft of FIG.

FIG. 5 is a perspective view showing a typical embodiment of a bearing in the bearing structure of the present invention.

FIG. 6 is a conceptual diagram for explaining a fitting state of a bearing to a journal of an excavating kneading shaft.

FIG. 7 is a cross-sectional view showing a relationship with a journal for explaining a modified example of a bearing.

FIG. 8 is an exploded perspective view for explaining a conventional bearing structure.

FIG. 9 is a front view of a binding portion for explaining a conventional bearing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multi-axis excavating kneading machine 2 ... Excavating kneading shaft 22 ... Flange 23 ... Journal 3 ... Bearing 30 ... Cutting part 31 ... Hinge part 31a ... Cut part 31b ... Hinge groove 32 ... Engagement flange 32a ... Sliding surface 33 ... Band fitting part 4: Bearing band 41a: Bolt θ1, θ2: Opening angle θ3: Deflection angle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02F 5/02 E02F 5/20 E21B 7/00 F16C 17/02

Claims (4)

(57) [Claims] 1. A multi-axis excavating and kneading machine, comprising: a bearing band for rotatably bundling an excavating and kneading shaft; and a hard elastic body bearing provided between the bearing band and the excavating and kneading shaft. The bearing has an engaging flange at both upper and lower ends and a band fitting portion formed between the engaging flanges, and a journal of the excavating kneading shaft in which two position regulating flanges are provided at predetermined intervals in the axial direction. In the bearing structure of the excavation kneading shaft in a multi-axis excavation kneader configured to be fitted and held in a cylindrical shape by the bearing band fitted to the band fitting portion of the bearing, The bearing has one cut portion formed by cutting the bearing parallel to the axis, and a hinge portion formed at a position substantially symmetrical with respect to the cut portion, and the hinge portion has upper and lower ends. Outer side of the engaging flange of the part A cut portion having a substantially trapezoidal shape with a divergent cross section provided and a hinge groove parallel to an axis provided on the surface of the band fitting portion are formed, and the cut portion is pushed and spread. A bearing structure for an excavating kneading shaft in a multi-shaft excavating kneader, wherein the bearing is configured to be fitted to the journal of the excavating kneading shaft. 2. A left and right wall surface of each of the notch portion and the hinge groove in the hinge portion is a plane, and the opening angle of the notch portion is 60 ° to 90 °, and the opening angle of the hinge groove is 60 ° to 90 °. The bearing structure of the excavating kneading shaft in the multiaxial excavating kneading machine according to claim 1, wherein the angle is 120 °. 3. The excavator according to claim 1, wherein the thickness of the bearing at the deepest portion of the cut portion is the same as the thickness of the bearing at the deepest portion of the hinge groove. Kneading shaft bearing structure. 4. The excavator according to claim 1, wherein, in the bearing, a surface direction of a cut surface of the cut portion is deviated from a radial direction of the bearing. Kneading shaft bearing structure.