JP6334609B2 - Rotating blade protector for ground improvement equipment - Google Patents

Description

  The present invention relates to a rotor blade protector that is attached to a rotor blade such as an excavation blade or a stirring blade of a ground improvement device and protects the rotor blade from wear.

  This type of rotor blade protector is proposed in Patent Document 1 as a wear reduction plate for a drilling blade (excavation blade). Generally, a rotor blade protector is attached to a tip surface portion where wear is most likely to proceed in a drilling blade or a stirring blade, which is a rotor blade attached to a ground improvement device, and protects the rotor blade from wear.

  The rotor blade protector described in Patent Document 1 integrally includes a base material body fixed to the rotor blade and a wear-resistant plate fixed to the base material body. The wear-resistant plate covers the upper surface of the base material, which is where the wear is most likely to proceed in the base material body, and the front surface of the base material facing the rotation direction of the rotor blades.

  In the rotor blade protector described in Patent Document 1, the wear-resistant plate is composed of a plurality of wear-resistant plate portions, and each wear-resistant plate portion is fixed to the base material main body in a state of being separated through a gap portion. Yes. Each wear-resistant plate portion is made of special steel that is harder than the base material body.

Utility Model Registration No. 3166428

  By the way, in this type of rotor protection body, depending on the hardness of the material used, it is known that if the rotor protection body collides with gravel etc. during use while rotating the rotor blade in the ground, it is easily damaged. It has been. Damage is likely to occur when a single material is used to form a plate.

  The rotor blade protector of Patent Document 1 is a composite body in which a plurality of wear-resistant plate portions that are harder than the base material main body are fixed to the base material main body. And is formed into a plate shape from a special steel, which is a single material. For this reason, it is pointed out that the wear-resistant plate portion is easily damaged during use in which the rotary blade is rotated in the ground.

  Then, this invention makes it a subject to provide the rotary blade protective body in a ground improvement apparatus which can suppress a failure | damage reliably in the use which is rotating the rotary blade in the ground.

The present invention relates to a rotor blade protector that is attached to a tip surface of a rotor blade of a ground improvement device and protects the rotor blade from wear, and includes a base material body and an abrasion resistant body, the base material body being a metal It is made of a plate having one surface and another surface opposite to the one surface, and is fixed to the tip surface of the rotor blade. The wear-resistant body is a metal having a higher hardness than the base material body. Formed of a material and fixed to the base material body so as to cover the other surface,
The wear-resistant body includes a low hardness region portion and a high hardness region portion having different hardnesses, and the low hardness region portion and the high hardness region portion are adjacent to each other along the surface direction of the other surface of the base material body. It is formed integrally, the base material main body is formed in a substantially rectangular parallelepiped plate shape, the low hardness region portions are disposed on both sides in the longitudinal direction of the base material main body, A high hardness region portion is disposed, and the short side direction of the base material body is between the one low hardness region portion and the high hardness region portion and between the other low hardness region portion and the high hardness region portion. The high hardness region portion is a high hardness metal lump whose surface is smoothly formed, and the longitudinal direction both sides of the upper surface of the high hardness region portion are directed downward toward the base material main body side. It is characterized by being formed on an inclined plane .

  Like the rotor blade protector of the present invention having the above configuration, if the low hardness region portion and the high hardness region portion are integrally formed to be adjacent along the surface direction of the surface of the base material body, Compared with the case where the same area of the surface of the base metal body is covered only with the high hardness region part, the impact on the high hardness region is mitigated by the presence of the low hardness region part. Damage to the wear-resistant body during use is suppressed.

The rotor blade protector of the present invention is a rotor blade protector that is attached to the tip surface of the rotor blade of the ground improvement device and protects the rotor blade from wear, and includes a base material body and an abrasion resistant body,
The base material body is made of metal, is formed in a plate shape that has one surface and another surface facing the one surface and is fixed to the tip surface of the rotor blade, and the wear-resistant body is attached to the base material body. Comparing to the base material main body so as to cover the other surface, the wear-resistant body has a low hardness region portion and a high hardness region portion having different hardness from each other. The low hardness region portion and the high hardness region portion are integrally formed so as to be adjacent along the surface direction of the other surface of the base material body, and the base material body is formed in a substantially rectangular parallelepiped plate shape. The high hardness region portion is disposed on both sides in the longitudinal direction of the base material main body, the low hardness region portion is disposed between the high hardness region portions, and the one high hardness region portion and the low hardness region are disposed. Of the base material main body and between the other high hardness region portion and the low hardness region portion. A concave portion is formed along the side direction, and the high-hardness region portion is a high-hardness metal lump whose surface is smoothly formed, and a longitudinal outer surface portion of the upper surface of each high-hardness region portion is the base material main body side. You may form in the inclined plane which inclines downward toward .

In the rotor blade protector of the present invention, the low-hardness region portion is a low-hardness metal lump in which a granular metal material pulverized in a granular form is dispersed, and the surface of the low-hardness metal lump is made of the granular metal material. Irregularities may be formed.

In the rotor blade protector configured as described above, during use in which the rotor blade is rotated in the ground, the granular metal material on the surface in the low hardness region portion is a low hardness metal before the surface of the high hardness region portion is worn. By detaching from the lump over time and wearing the low hardness region part, wear of the high hardness region part is reduced, and the tip surface of the rotating blade rotating in the ground is protected from wear, and that much Long-term use of the rotor blade protector becomes possible.

In the rotor blade protector of the present invention, the maximum height dimension from the other surface of the base material main body in the low hardness region portion is set larger than the height dimension from the other surface in the high hardness region portion. Can be adopted.

  In the rotor blade protector configured as described above, the low hardness region portion is worn because the low hardness region portion contacts the ground prior to the high hardness region portion during use of the rotating blade rotating in the ground. Later, the high hardness region portion is worn to protect the tip surface of the rotating blade rotating in the ground from wear.

  According to the rotor blade protector of the present invention, breakage can be reliably suppressed during use in which the rotor blade is rotated in the ground.

It is a perspective view showing the attachment state to the excavation blade of the rotor blade protection body which concerns on one Embodiment of this invention. It is a side view showing the attachment state to the excavation blade of the rotary blade protection body. It is a single-piece | unit perspective view of the rotary blade protection body. It is a side view of the rotary blade protection body. It is a top view of the rotary blade protection body. 1 is a single perspective view of a rotor blade protector according to an embodiment of the present invention. It is a side view of the rotary blade protection body. It is a top view of the rotary blade protection body.

  Hereinafter, with reference to FIG. 1 thru | or FIG. 5, the rotor protection body 1 which concerns on 1st embodiment of this invention is demonstrated. As shown in FIGS. 1 and 2, the rotating blade protector 1 is used by being fixed to a drilling blade (an example of a rotating blade) 3 of an excavation head 2 attached to a ground improvement machine.

  The rotor blade protector 1 according to the first embodiment is suitable for use in improving hard ground containing a large amount of gravel and the like. Since the excavation head 2 is a known one, only the general structure will be described.

  The excavation head 2 is detachably attached to the tip of the auger rod of the ground improvement machine. The excavation head 2 includes a rotation center shaft 4 that is detachably attached to the tip of the auger rod, and a plurality of (this is radially outward) extending on the outer peripheral surface of the tip portion of the rotation center shaft 4. Two excavating blades 3 in some cases. Each excavation blade 3 is formed in a plate shape, and is attached to be inclined with respect to the axial direction of the rotation center shaft 4. A plurality of excavation bits 5 are detachably attached to the lower surface of each excavation blade 3. The excavation blade 3 is inclined with respect to the axial direction so that the tip of the excavation bit 5 faces the rotation direction of the rotation center shaft 4.

  Each excavation blade 3 includes a tip surface 6 which is an outer end surface in the radial direction (longitudinal direction). The tip surface 6 is formed in a rectangular plane, and the excavating blade 3 is attached to be inclined with respect to the axial direction of the rotation center shaft 4. It follows the inclined direction.

  The rotor blade protector 1 is attached to the tip surface 6 of each excavation blade 3. Depending on the size of the tip surface 6 of the excavation blade 3, one or a plurality of the rotor blade protectors 1 are attached side by side. The rotor blade protector 1 is formed in a substantially rectangular parallelepiped shape. As shown in FIGS. 3 to 5, the rotor blade protector 1 includes a base material body 10 and a wear-resistant body 11.

  The base material body 10 is a metal lump that is formed in a plate shape and is fixed to the tip surface 6 of the excavation blade 3. The width dimension of the base material body 10 is set to a dimension that does not exceed the width dimension of the distal end surface 6. The thickness of the base material body 10 is set to about 1 cm. For example, SS400 is used as the molding material of the base material body 10 as a steel material having a Vickers hardness of about 130 HV.

  The wear-resistant body 11 includes a high hardness region portion 12 and a low hardness region portion 13 having different hardnesses. In this case, the wear-resistant body 11 includes one high-hardness region portion 12 and two low-hardness region portions 13. In the base material body 10, the wear-resistant body 11 faces one surface attached to the tip surface 6 of the excavating blade 3. It is provided so as to cover the surface. The high hardness region portion 12 and the low hardness region portion 13 are formed of a metal material having a hardness higher than that of the base material body 10, and are along the surface direction of the other surface of the base material body 10, that is, the length of the other surface. Adjacent to each other in one direction.

  The high hardness region portion 12 is disposed at the longitudinal center portion of the other surface, the low hardness region portion 13 is disposed on the longitudinal direction end portion side of the other surface, and the high hardness region portion 12 is disposed at the low hardness region portion 13. Are provided so as to be sandwiched from both sides in the longitudinal direction. As the high hardness region portion 12, for example, a super steel alloy having a Vickers hardness of about 940 HV is used.

  The high hardness region portion 12 is a high hardness metal lump formed in a substantially rectangular parallelepiped shape having the same width as the base material main body 10. The back surface of the high hardness region portion 12 is welded to the other surface of the base material body 10. The upper surface 12a of the high hardness region 12 is a smooth plane. Of the upper surface 12a, both longitudinal portions are inclined planes 12b that are inclined downward toward the base material body 10 side. The inclination angle of the inclined plane 12 b is set so that the tip side 12 c does not reach the other surface of the base material body 10.

  In other words, the high hardness region portion 12 includes a rectangular parallelepiped lower base portion 12A and an upper trapezoid base portion 12B integrally formed on the upper surface of the lower base portion 12A, and the width of the bottom surface and the upper surface of the upper trapezoid base portion 12B. The dimensions are the same in the longitudinal direction, and an inclined flat surface 12b that is inclined downward toward the base material body 10 side is provided on the upper surface. The front end side 12c of the inclined plane 12b coincides with the upper surface of the lower base portion 12A. The thickness dimension of the high hardness region 12, that is, the height dimension from the upper surface of the lower base 12 </ b> A is set smaller than the thickness dimension of the base material body 10.

The low hardness region portion 13 is a low hardness metal lump formed by dispersing a number of granular metal materials 13a pulverized into a granular shape. On the surface of the low hardness region 13, unevenness due to the particulate metal material 13a is made form. The granular metal material 13a is a metal particle of the same material as that of the high hardness region portion 12, and the particle size is formed to be about 0.5 to 1.0 mm. As the binder 13b between the granular metal materials 13a, a metal material having a Vickers hardness of about 140 HV, for example, is used as a melt-curing material. The low hardness region portion 13 is fixed to the surface of the base material body 10 by the binder 13b.

  The low hardness region portion 13 may have a uniform thickness or a non-uniform thickness in the longitudinal direction of the other surface of the base material body 10. In the low hardness region portion 13, the maximum height dimension from the other surface is preferably larger than the height dimension from the other surface in the high hardness region portion 12. In the case of the non-uniform thickness of the low hardness region portion 13, any position in the longitudinal direction may be the maximum height dimension from the other surface. In the present embodiment, the low hardness region portion 13 has a non-uniform thickness and is set to the maximum height dimension (thickness) in the central portion in the longitudinal direction.

  In this case, the maximum height dimension of the low hardness region portion 13 is set to be about 1 to 3 mm larger than the height dimension of the high hardness region portion 12. More specifically, the upper surface of each low hardness region portion 13 is formed such that both longitudinal sides of the other surface of the base material body 10 are lower than the central portion in the longitudinal direction. In the present embodiment, the blending ratio of the granular metal material 13a and the binder 13b in the low hardness region 13 is preferably 4: 1 to 9: 1, and is 4: 1 in the present embodiment. However, the blending ratio of the granular metal material 13a and the binder 13b is not particularly limited as long as it is in the range of 4: 1 to 9: 1.

  The rotor blade protector 1 has a high hardness region portion 12 formed thereon, a low hardness region portion 13 is formed on the other surface of the base material body 10, and the binder 13b of the low hardness region portion 13 is not yet solidified. The high hardness region portion 12 is brought into pressure contact with the other surface of the base material body 10 between the low hardness region portions 13, and the high hardness region portion 12 and the low hardness region portion 13 are integrated by the solidification force of the binder 13b. Is done.

  The material of the base material main body 10 and the welding rod are made of materials that are easily fixed to each other. And since the binder 13b of the low hardness region portion 13 is not yet solidified, the high hardness region portion 12 is pressed against the other surface of the base material body 10 between the low hardness region portions 13 to wait for the binder 13b to solidify. The high hardness region portion 12 and the low hardness region portion 13 are continuous, and a concave portion 11 a is formed between the high hardness region portion 12 and the low hardness region portion 13 along the width direction of the rotor blade protector 1. The

  One or a plurality of base material main bodies 10 in the rotor blade protector 1 having the above-described configuration are fixed to the tip surface 6 of the excavation blade 3 by welding. The tip surface 6 of the excavation blade 3 follows the direction inclined with respect to the axial center direction of the rotation center shaft 4, and the rotor blade protector 1 has its longitudinal direction aligned with the inclination direction of the tip surface 6. Secure to surface 6. Since the base material body 10 is made of SS400, the base material body 10 is easily welded to the excavation blade 3 and is firmly fixed to the excavation blade 3.

  The excavation head 2 is attached so that the rotation center shaft 4 is fixed to the auger rod in a state where the rotary blade protector 1 is fixed to the excavation blade 3. When the auger rod is rotated and a load acting downward from the auger rod is applied to the excavation head 2, the excavation head 2 descends while rotating about the axis of the rotation center shaft 4. The ground is excavated. The excavated ground and solidified material are separately provided on the auger rod with the forward rotation (rotation in one direction) and reverse rotation (rotation in the opposite direction opposite to one direction) of the rotation center shaft 4 Are mixed and stirred by rotating in the forward and reverse directions, and a ground improvement body is created in the ground.

  In the excavation head 2 configured as described above, the excavation blade 3 is inclined with respect to the axial direction so that the tip of the excavation bit 5 faces the rotation direction of the rotation center shaft 4, and the tip surface 6 of the excavation blade 3 is also the rotation center. It follows the direction inclined with respect to the axial direction of the shaft 4. For this reason, in the rotary blade protection body 1, the low hardness region portion 13 comes into contact with the ground prior to the high hardness region portion 12 while the excavation blade 3 is rotating in the ground. Therefore, in the ground, before the surface of the high hardness region portion 12 is worn, the granular metal material 13a on the surface in the low hardness region portion 13 is detached from the low hardness region portion 13 (low hardness metal block) with time. The low hardness region 13 is worn.

  In other words, wear of the high hardness region portion 12 is suppressed by the low hardness region portion 13 preceding the high hardness region portion 12 and colliding with gravel or the like (hereinafter simply referred to as “gravel”). Long-term use of the rotor blade protector 1 becomes possible. And the low hardness area | region part 13 wears sequentially, and the excavation wing | blade 3 (the front end surface 6) rotating in the ground with the high hardness area | region part 12 is protected from abrasion.

  The maximum height dimension from the other surface of the low hardness region portion 13 is set larger than the height dimension from the other surface in the high hardness region portion 12. Even in this configuration, in the ground, before the surface of the high hardness region portion 12 is worn, the granular metal material 13a on the surface in the low hardness region portion 13 is separated from the low hardness region portion 13 with time, and the low hardness. The region 13 is worn. Thereby, the excavation blade 3 rotating in the ground is protected from wear while suppressing wear of the high hardness region portion 12.

  This is because the rotor blade protector 1 is attached to the tip surface 6 along the inclination direction of the tip surface 6 of the excavating blade 3, and the low hardness region portions 13 are arranged on both sides in the longitudinal direction of the base material body 10. Therefore, the same is true when the rotation center shaft 4 is rotated forward and backward. Therefore, the rotor blade protector 1 according to the first embodiment is suitable for use in improving hard ground containing a lot of gravel.

  In the rotor blade protector 1 according to the first embodiment, the wear resistant body 11 includes a low hardness region portion 13 and a high hardness region portion 12 having different hardnesses, and the wear resistant body 11 is a mother having a lower hardness. It is integrated with the surface of the material body 10. In general, high hardness materials have poor toughness. If the base material body 10 and the wear-resistant body 11 are integrally formed of a high-hardness material, even if it is a high-hardness material, it rotates while the excavation blade 3 is rotated in the ground. When the wing protector collides with gravel, it is easily damaged.

  However, like the rotor blade protector 1, the wear resistant body 11 includes the low hardness region portion 13 and the high hardness region portion 12 having different hardness, and the wear resistant body 11 has a base material body 10 having a lower hardness than that. If the high hardness region portion 12 collides with the gravel during use, the impact associated therewith is buffered by the integrated low hardness region portion 13. Damage to the hardness region portion 12 is suppressed.

  In addition, the low hardness region portion 13 and the high hardness region portion 12 are integrated with the other surface of the base material body 10. By this, compared with the case where the same area of the surface of the base material body 10 is covered only by the high hardness region portion 12, or compared to the case where the entire rotor blade protector is formed of a high hardness metal material, A reduction in the high hardness region 12 is realized. With this configuration, the high hardness region 12 is more reliably prevented from being damaged and can be used for a long time.

  The upper surface 12a of the high hardness region portion 12 is a smooth flat surface, and both longitudinal portions of the upper surface 12a are inclined flat surfaces 12b inclined downward toward the base material main body 10 side. In the case where the high hardness region portion 12 is formed in a simple rectangular parallelepiped plate shape by eliminating inclined portions 12b by making the both sides in the longitudinal direction of the upper surface 12a of the high hardness region portion 12 into inclined planes 12b. Compared to the above, since the corner portions that are easily chipped are reduced, damage to the high hardness region portion 12 due to the collision of gravel can be suppressed accordingly.

  Next, the rotor blade protector 1 according to the second embodiment will be described with reference to FIGS. 6 to 8. The rotor blade protector 1 according to the second embodiment is attached to the tip surface 6 of the excavating blade 3 by welding in the same manner as the rotor blade protector 1 according to the first embodiment. The rotor blade protector 1 according to the second embodiment is suitable for use in improving soft ground containing a large amount of mud, clay, sand and the like.

  The rotor blade protector 1 includes a base material body 10 and a wear-resistant body 11. Since the base material main body 10 has the same configuration as that of the first embodiment, the same reference numerals are given and description thereof is not repeated.

  In the first embodiment, the wear resistant body 11 includes a high hardness region portion 12 and a low hardness region portion 13 having different hardnesses. The wear-resistant body 11 includes one high hardness region portion 12 and two low hardness region portions 13, and the other surface of the base material body 10 that faces the one surface that is attached to the tip surface 6 of the excavating blade 3. It is provided to cover.

  On the other hand, the wear-resistant body 11 according to the second embodiment includes two high hardness region portions 12 and one low hardness region portion 13, and the tip surface 6 of the excavating blade 3 in the base material body 10. It is provided so that the other surface facing one surface attached to may be covered. The high hardness region portion 12 and the low hardness region portion 13 are integrally formed along the surface direction of the other surface of the base material body 10, that is, adjacent to each other in the longitudinal direction of the other surface.

  The low hardness region portion 13 is disposed at the longitudinal center portion of the other surface, and the high hardness region portion 12 is disposed on the longitudinal end portion side of the other surface. The low hardness region 13 is provided in the high hardness region 12 so as to be sandwiched from both sides in the longitudinal direction. In this case, the area of the low hardness region portion 13 that covers the other surface of the base material body 10 corresponds to the area that the high hardness region portion 12 in the first embodiment covers the other surface of the base material body 10. The area of the high hardness region portion 12 that covers the other surface of the base material body 10 corresponds to the area that the low hardness region portion 13 in the first embodiment covers the other surface of the base material body 10.

  Each high hardness region portion 12 is formed as an inclined flat surface 12b that inclines the outer side surface in the longitudinal direction downward toward the base material main body 10 side. The inclination angle of the inclined plane 12 b is set so that the tip side 12 c does not reach the other surface of the base material body 10. The low hardness region portion 13 may have a uniform thickness or a non-uniform thickness in the longitudinal direction of the other surface of the base material body 10.

  In the low hardness region portion 13, the maximum height dimension from the other surface of the base material body 10 is preferably larger than the height dimension from the other surface in the high hardness region portion 12. In the present embodiment, the low hardness region portion 13 has a non-uniform thickness and is set to the maximum height dimension (thickness) in the central portion in the longitudinal direction. Since other configurations are the same as those of the first embodiment, description thereof will not be repeated.

  The rotor blade protector 1 according to the second embodiment forms a high hardness region portion 12 and forms a low hardness region portion 13 at the center in the longitudinal direction of the other surface of the base body 10. Before the binder 13b of 13 is not yet solidified, the high hardness region portion 12 is pressed against the other surface of the base material body 10 so as to sandwich the low hardness region portion 13, and the high hardness region portion 12 and the solidified force of the binder 13b are used. It is manufactured by integrating the low hardness region portion 13.

  Before the binder 13b of the low hardness region 13 is not yet solidified, the high hardness region 12 is brought into pressure contact with the other surface of the base body 10 so as to sandwich the low hardness region 13, and the binder 13b is solidified. Therefore, the high hardness region portion 12 and the low hardness region portion 13 are continuous, and a concave portion 11a along the width direction of the rotor blade protector 1 is provided between the high hardness region portion 12 and the low hardness region portion 13. It is formed.

  In the rotor blade protector 1 in the second embodiment, the high hardness region portion 12 contacts the ground earlier than the low hardness region portion 13 in both the forward rotation and the reverse rotation of the excavation blade 3. For this reason, the rotor protection body 1 in the second embodiment is suitable for use in improving soft ground with less gravel.

  However, the rotor blade protector 1 in the second embodiment includes the low hardness region portion 13, and the low hardness region portion 13 has a maximum height dimension from the other surface, from the other surface in the high hardness region portion 12. It should be set larger than the height dimension. With this, if there is gravel in the soft ground and it collides with the low hardness region portion 13, the granular metal material 13a on the surface in the low hardness region portion 13 is detached from the low hardness region portion 13 with time, The low hardness region 13 is worn. The high hardness region portion 12 is protected for a long time by the amount of wear of the low hardness region portion 13 by gravel, and the rotor blade protector 1 as a whole can be used for a long time.

  The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. In each of the above embodiments, the wear-resistant body 11 is illustrated as being provided on the base material body 10 so as to cover only the other surface facing one surface attached to the tip surface 6 of the excavating blade 3. However, the wear-resistant body 11 can be provided not only on the other surface of the base material main body 10 but also on all the surfaces other than one surface of the base material main body 10 and continuous with the other surface.

  In each said embodiment, the case where the rotary blade protection body 1 was attached to the excavation blade 3 was illustrated. However, the rotor blade protector 1 can be used by being attached to a stirring blade (not shown), and in this case, wear of the stirring blade can be suppressed.

  In each of the above embodiments, the low hardness region portion 13 is exemplified as a low hardness metal lump in which a large number of granular metal materials 13a pulverized in a granular form are dispersed. However, a metal lump having a hardness higher than that of the base material main body 10 and lower than that of the high hardness region portion 12 can be obtained without dispersing the granular metal material 13a. In each said embodiment, the case where the high hardness area | region part 12 was formed in plate shape was illustrated. However, it is possible to integrally form a high-hardness part, which is formed in a semicylindrical shape so as to be continuous in the longitudinal direction or the width direction, or to continue a high-hardness part, which is formed in a semispherical shape, in the longitudinal direction or the width direction. It can also be formed integrally.

  In the first embodiment, the rotary blade protector 1 including two low hardness region portions 13 and one high hardness region portion 12 is illustrated, and in the second embodiment, one low hardness region portion 13 and The rotor blade protector 1 provided with the two high hardness region portions 12 is exemplified. However, the rotor blade protector 1 of the present invention may have a configuration in which the other surface of the base material body 10 is covered with one low hardness region portion 13 and one high hardness region portion 12.

  DESCRIPTION OF SYMBOLS 1 ... Rotary blade protector, 2 ... Excavation head, 3 ... Excavation blade, 4 ... Rotation center axis, 5 ... Excavation bit, 6 ... Tip surface, 10 ... Base material main body, 11 ... Wear-resistant body, 11a ... Concave part, 12 ... high hardness region part, 12A ... lower base part, 12B ... upper trapezoidal base part, 12a ... upper surface, 12b ... inclined plane, 12c ... tip side, 13 ... low hardness region part, 13a ... granular metal material, 13b ... binder

Claims (4)

A rotary blade protector that is attached to the tip surface of the rotor blade of the ground improvement device and protects the rotor blade from wear, comprising a base material body and an abrasion resistant body,
The base material body is made of metal, and has a plate shape that has one surface and the other surface facing the one surface, and is fixed to the tip surface of the rotor blade,
The wear-resistant body is formed of a metal material having a hardness higher than that of the base material body, and is fixed to the base material body so as to cover the other surface.
The wear-resistant body includes a low hardness region portion and a high hardness region portion having different hardnesses, and the low hardness region portion and the high hardness region portion are adjacent to each other along the surface direction of the other surface of the base material body. Integrally formed,
The base material body is formed in a substantially rectangular parallelepiped plate shape, the low hardness region portion is disposed on both sides in the longitudinal direction of the base material body, and the high hardness region portion is disposed between the low hardness region portions. And a recess is formed between the one low hardness region portion and the high hardness region portion and between the other low hardness region portion and the high hardness region portion along the short side direction of the base material body. The high hardness region portion is a high hardness metal lump whose surface is formed smoothly, and is formed on an inclined plane that is inclined downward toward the base material body side on both sides in the longitudinal direction of the upper surface of the high hardness region portion. rotary blade protector, characterized in that it is. A rotary blade protector that is attached to the tip surface of the rotor blade of the ground improvement device and protects the rotor blade from wear, comprising a base material body and an abrasion resistant body,
The base material body is made of metal, and has a plate shape that has one surface and the other surface facing the one surface, and is fixed to the tip surface of the rotor blade,
The wear-resistant body is formed of a metal material having a hardness higher than that of the base material body, and is fixed to the base material body so as to cover the other surface.
The wear-resistant body includes a low hardness region portion and a high hardness region portion having different hardnesses, and the low hardness region portion and the high hardness region portion are adjacent to each other along the surface direction of the other surface of the base material body. Integrally formed,
The base material body is formed in a substantially rectangular parallelepiped plate shape, the high hardness region portion is disposed on both longitudinal sides of the base material body, and the low hardness region portion is disposed between the high hardness region portions. A recess is formed between the one high hardness region portion and the low hardness region portion and between the other high hardness region portion and the low hardness region portion along the short side direction of the base material body. The high-hardness region portion is a high-hardness metal lump whose surface is formed smoothly, and an inclined plane that inclines the outer surface in the longitudinal direction downward from the upper surface of each high-hardness region portion toward the base material body side. Rotating blade protector characterized by being formed into Before SL low hardness region portion is a low-hardness metal mass comprising the particulate metallic material which is comminuted into granules dispersed on the surface of the low-hardness metal mass claims irregularities by the particulate metal material is made form Item 3. A rotor protector according to Item 1 or 2. The rotation according to claim 3 , wherein a maximum height dimension from the other surface of the base material body in the low hardness region portion is set larger than a height dimension from the other surface in the high hardness region portion. Wing protector.

Images