JP7485355B2 - Rebar cutting machine - Google Patents

Description

The present invention relates to a rebar cutting machine.

Conventionally, a rebar cutting machine for cutting rebar works by placing the rebar (hereinafter also referred to as the "rebar to be cut"), for example, between a fixed blade and a movable blade arranged above and below, and applying a shear force to the rebar to be cut by moving the movable blade toward the fixed blade side, thereby cutting it.
For example, this type of rebar cutting machine has a configuration disclosed in Patent Document 1. The rebar cutting device disclosed in Patent Document 1 has a cutting blade that has multiple recesses that are curved to correspond to the outer circumferential direction of the rebar to be cut, and is equipped with a cutting blade generally called an "R blade" that fits the rebar to be cut in these recesses and cuts it.

Japanese Patent Application Laid-Open No. 9-38744

Although not specifically described in the configuration of the rebar cutting machine disclosed in Patent Document 1, when cutting using this type of R-blade, there is a task of positioning multiple rebars to be cut so that they fit into each of the recesses of the R-blade. Currently, this task is done manually, and in this task, for example, after manually placing the rebars to be cut into the recesses of the R-blade, the worker visually checks whether the rebars to be cut fit into the recesses, and then performs the cutting. This requirement for manual work not only places a heavy burden on the worker, but also prevents work efficiency from increasing, making it difficult to increase productivity.

The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to provide a rebar cutting machine that can cut rebars with high productivity using an R blade.

The above object can be achieved by the following means. That is, the present invention is as follows.
[1]
A rebar cutting machine having an upper blade and a lower blade that are relatively movable in the vertical direction and are offset in the longitudinal direction when cutting a rebar to be cut,
A cutting blade driving member that moves the lower blade in a vertical direction;
a positioning member that moves the rebar to be cut inserted between the upper blade and the lower blade in a radial direction of the rebar to be cut,
The upper blade and the lower blade have cutting edges along a direction perpendicular to the longitudinal direction of the rebar to be cut,
The positioning member restricts the movement of the reinforcing bar to be cut in the radial direction after the reinforcing bar is moved in the radial direction,
The lower blade is composed of an R-blade having a plurality of R-shaped concave surfaces arranged side by side to receive the reinforcing bar to be cut,
The cutting blade driving member of this rebar cutting machine moves the lower blade to a position not exceeding the vertical position of the insertion side holding portion of the rebar to be cut at a waiting position before the rebar to be cut is inserted.

[2]
The rebar cutting machine according to [1],
the cutting blade driving member drives only the lower blade of the upper blade and the lower blade,
The rebar to be cut, whose position is restricted by the positioning member, is cut by moving the lower blade vertically upward by the cutting blade driving member.
Rebar cutting machine.

[3]
The rebar cutting machine according to [1] or [2],
The rebar cutting machine further includes a first position regulating portion at a position facing the positioning member across the rebar to be cut, which regulates the radial position of the rebar to be cut.

[4]
The rebar cutting machine according to any one of [1] to [3],
A rebar cutting machine, wherein the pitch of the R-shaped concave surface of the lower blade is configured to be equal to the outer diameter of the rebar to be cut.

[5]
The rebar cutting machine according to any one of [1] to [4],
A rebar cutting machine, wherein the positioning member is provided on at least one of the upstream and downstream sides of the lower blade.

[6]
The rebar cutting machine according to [5],
The positioning member is provided with a third position regulating portion on the opposite side of the insertion side holding portion across the lower blade.

[7]
The rebar cutting machine according to any one of [1] to [6],
A rebar cutting machine, wherein in the lower blade, the continuous portion between adjacent R-shaped concave surfaces is configured as a curved surface that bulges toward the opposite side to the R-shaped concave surface.

According to the rebar cutting machine of [1], the lower blade is moved to a position not exceeding the vertical position of the inserting side holding part of the rebar to be cut at the waiting position before the rebar to be cut is inserted, so that the rebar to be cut can be inserted directly from a conveying device such as a conveyor, and further, the rebar can be moved in a direction perpendicular to the longitudinal direction of the rebar to be cut (rebar radial direction) without contacting the lower blade. As a result, the rebar to be cut can be inserted and moved to the cutting position very easily, and automatic cutting operation is easy. As a result, a rebar cutting machine with high productivity can be provided.

According to the rebar cutting machine of [2], the rebar to be cut is positioned in advance by a positioning member relative to the lower blade, which is composed of an R-blade with multiple R-shaped concave surfaces arranged side by side, so that the rebar to be cut can be automatically placed inside the R-shaped concave surface. In this state, the lower blade is raised to cut the rebar to be cut, so that multiple rebars to be cut can be cut to the desired length at the same time.

According to the rebar cutting machine of [3], the rebar to be cut can be positioned at a predetermined position in the radial direction of the rebar by the first position control part and the positioning member before cutting is performed, so that the rebar to be cut can be smoothly fitted into the R-shaped concave surface.

According to the rebar cutting machine of [4], the pitch of the R-shaped concave surface of the lower blade is configured to be equal to the outer diameter of the rebar to be cut, so that the rebar to be cut can be automatically inserted into the R-shaped concave surface by the upward movement of the lower blade.

According to the rebar cutting machine of [5], the positioning member is provided on at least one of the upstream and downstream sides of the lower blade where the rebar to be cut is inserted, allowing the rebar to be accurately positioned. The positioning member can also be used as a position control means when inserting the rebar.

According to the rebar cutting machine of [6], the positioning member is also provided with a third position control part on the opposite side of the lower blade from the insertion holding surface, so that the rebar to be cut can be positioned in front of and behind the cutting blade, enabling more reliable position control.

According to the rebar cutting machine of [7], the part of the lower blade that forms the upper end between adjacent R-shaped concave surfaces is configured as a curved surface that bulges toward the rebar in the opposite direction to the curvature of the R-shaped concave surfaces, making it easier to fit the rebar to be cut that is positioned on the lower blade into the R-shaped concave surfaces.

FIG. 1 is a front view of a rebar cutting machine according to an embodiment of the present invention. FIG. 2 is a perspective view of a main part of the rebar cutting machine shown in FIG. 1 . FIG. 2 is an enlarged side view of a lower blade in the rebar cutting machine shown in FIG. 1 . 2 is a schematic side view of the cutting position of the rebar cutting machine shown in FIG. 1 with the rebar to be cut inserted. FIG. 2 is a schematic side view of the cutting position of the rebar cutting machine shown in FIG. 1 after the positioning member has moved laterally; FIG. FIG. 2 is a schematic side view of the rebar cutting machine shown in FIG. 1 , showing a state in which the lower blade has moved to a cutting position.

The rebar cutting machine of one embodiment of the present invention will be described below with reference to Figures 1 to 6. In the following description, "upper and lower" refers to the upper and lower sides when the rebar cutting machine is installed, "front side" refers to the near side or front side when the rebar bending machine is viewed from the front, and the opposite side is referred to as the rear side or back side. In addition, "left side," "right side," and "left and right" refer to the left and right sides when the rebar cutting machine is viewed from the front.

The rebar cutting machine 1 of this embodiment cuts the rebar 50 to be cut to a specified length, and is provided as part of a rebar processing facility that includes other processing machines and conveyors that perform bending and other processes after cutting, along with the rebar cutting machine 1. For example, the rebar processing facility includes a supply side conveyor device (not shown) that supplies the rebar 50 to be cut to the rebar cutting machine 1, which is installed to the right of the rebar cutting machine 1 shown in Figure 1.

As shown in Figures 1 and 2, the rebar cutting machine 1 comprises a cutting machine body 2 configured in a substantially rectangular shape when viewed from the front side, an upper blade 12 arranged above the cutting position where the rebar to be cut 50 is placed on the upper side of the cutting machine body 2, a lower blade 11 provided below the cutting position, a positioning member 20 capable of positioning the rebar to be cut 50 at the cutting position, and a lower blade support part 3 which is a cutting blade driving member that drives the lower blade 11.

The cutting machine body 2 has a cutting space (rebar holding space) formed in the left-right direction at the upper front side, where the rebar 50 to be cut is supplied from the right side. The upper blade 12 is provided above the approximate center (cutting position) of the cutting space in the left-right direction, and the lower blade 11 is provided below the upper blade 12. The lower blade 11 is offset from the upper blade 12 in the longitudinal direction of the rebar 50 to be cut (to the right in Figure 1). The position of the cutting space where the upper blade 12 and lower blade 11 are arranged is set at a height that makes it easy for an operator to stand and operate or check. The left side of the cutting space is provided with holding members 17 and 18 that can clamp the cut rebar from above and below.

Naturally, the cutting edges of the upper blade 12 and the lower blade 11 are aligned in a direction perpendicular to the longitudinal direction of the rebar 50 to be cut. The upper blade 12 is fixed facing downward to the cutting machine body 2, while the lower blade 11 is mounted on the lower blade support part 3 so that it can move upward toward the upper blade 12.

The insertion side holding section 21 is a plate-shaped member provided between the lower blade 11 and the supply side conveyor device. The insertion side holding section 21 can continuously move the rebar 50 to be cut that is being transported from the supply side conveyor device (transported from right to left in the figure) into the cutting space. For example, the insertion side holding section 21 is configured to hold from below the long rebar 50 to be cut that is fed approximately horizontally by a supply side conveyor device such as a roller conveyor and slide it.

A first position restricting portion 28 is provided on the rear side (deep side) of the insertion side holding portion 21, which cooperates with the positioning member 20 to restrict the radial position of the rebar 50 to be cut.

The lower blade support part 3 moves up and down by a drive system (not shown) provided on the lower side of the cutting machine body 2. That is, the lower blade 11 is attached to the upper end of the lower blade support part 3, and by moving up and down, the lower blade 11 moves relative to the upper blade 12. Also, the lower blade support part 3 moves up and down between a standby position and a cutting position, but in the standby position before the rebar 50 to be cut is inserted, the lower blade 11 is held at a lower position than the insertion side holding part 21, as described below.

The lower blade 11 is configured in the shape of a roughly rectangular block with the short side extending in the longitudinal direction of the rebar and the long side extending in the radial direction of the rebar. One end face (upper end face) of the lower blade 11 has multiple grooves extending in the short side direction (see Figure 2). As shown in Figure 3, the multiple grooves have a cross-sectional shape formed as an R-shaped concave surface 11d that can receive the rebar 50 to be cut. The lower blade 11, which is configured with an R-blade in this way, is configured so that the pitch P of the R-shaped concave surface 11d is equal to the outer diameter of the rebar 50 to be cut.

In addition, the portion of the lower blade 11 that constitutes the upper end 11t between adjacent R-shaped concave surfaces 11d is configured as a curved surface. In other words, as shown in FIG. 3, the portion that constitutes the upper end 11t is a curved surface that bulges in the opposite direction to the curvature of the R-shaped concave surfaces 11d (upward in the figure). In addition, the upper blade 12 is configured as an R blade that corresponds to the lower blade 11.

When the rebar 50 to be cut is inserted into the cutting space, the upper end 11t of the lower blade 11 stops at a position lower than the rebar holding surface 21s of the insertion side holding part 21, as shown in Figure 3. In this way, when the rebar 50 to be cut is inserted, the rebar 50 to be cut and the lower blade 11 are in a non-contact state, so that the rebar 50 to be cut can move freely on the rebar holding surface 21s.

The positioning member 20 includes a drive unit 20a such as an air cylinder provided on the upper right side of the cutting machine body 2, a pair of lower drive rods 20f that are driven in the front-rear direction toward the front side of the cutting machine body 2, and a second position regulating unit 20b and a third position regulating unit 20c attached to the drive rods 20f. The second position regulating unit 20b and the third position regulating unit 20c are arranged so as to be located on the front side of the rebar cutting machine 1 with respect to the rebar 50 to be cut that is inserted into the cutting space.

The second position regulating part 20b is configured as a plate-shaped member that extends vertically and whose plane faces the rear of the main body. The second position regulating part 20b is attached to the tip of the driving rod 20f. The second position regulating part 20b is also arranged on the upstream side (right side in the figure) where the rebar 50 to be cut is inserted relative to the lower blade 11. The second position regulating part 20b is also arranged so that its lower end 20bd approaches the rebar holding surface 21s of the insertion side holding part 21 and can move on it. Therefore, by driving the driving part 20a, the second position regulating part 20b can move the rebar 50 to be cut inserted into the cutting space on the rebar holding surface 21s. The second position regulating part 20b is also configured to be long in the vertical direction as shown in the figure. As a result, the second position regulating part 20b regulates the position of the rebar 50 to be cut even when moving upward, as described later.

The third position regulating part 20c is provided at the tip of a horizontal arm 20m that extends horizontally to the left at the lower end side of the second position regulating part 20b. This third position regulating part 20c is provided downstream (left side in the figure) of the lower blade 11. The third position regulating part 20c is smaller than the second position regulating part 20b, but like the second position regulating part 20b, it is a plate-shaped member with a flat surface that extends vertically facing the rear of the main body. Therefore, the third position regulating part 20c can push the rebar 50 to be cut in synchronization with the second position regulating part 20b by driving the driving part 20a.

The horizontal arm 20m is curved, for example, into a U-shape when viewed from above.

The positioning member 20 configured in this manner can position the rebar 50 to be cut by restricting its position from both the front and rear sides using the second and third position restricting parts 20b, 20c and the first position restricting part 28.

The operation of the rebar cutting machine 1 will be described below with reference to FIGS.
First, as shown in FIG. 4, for example, two rebars 50 to be cut are inserted into the cutting space. At this time, the rebars 50 to be cut are placed on the rebar holding surface 21s of the insertion side holding part 21 with a gap between them. Then, the positioning member 20 is driven. As a result, as shown in FIG. 5, the second position regulating part 20b and the third position regulating part 20c move toward the rear side (right side in the figure) of the cutting machine main body 2. Due to this movement, the rebar 50 to be cut is pushed by the second and third position regulating parts 20b, 20c and moves. Then, the second and third position regulating parts 20b, 20c and the first position regulating part 28 regulate the radial position and position the rebar. The cutting length is set to a predetermined length using a stopper or the like (not shown).

When the rebar to be cut 50 is pushed by the second and third position control sections 20b and 20c and moves laterally, as described above, the rebar to be cut 50 moves on the rebar holding surface 21s, which is separated from the lower blade 11, and can therefore move without coming into contact with the lower blade 11.

As shown in FIG. 5, the rebar 50 to be cut is clamped from above and below by the holding members 17, 18 while its position is regulated by the second and third position regulating members 20b, 20c and the first position regulating member 28. After that, the positioning member 20 returns to the standby position (the position shown in FIG. 4) at the same time as the lower blade 11 starts to move upward. As the lower blade 11 rises, the rebar 50 to be cut fits within the R-shaped concave surface 11d of the lower blade 11. The holding members 17, 18 move upward in sync with the lower blade 11 while still holding the rebar 50 to be cut.

In this way, as the lower blade 11 moves upward, the rebar 50 to be cut is automatically placed within the R-shaped concave surface 11d, and the lower blade 11 moves further upward. Then, as shown in Figure 6, a shear force is applied between the lower blade 11 and the upper blade 12, and good rebar cutting is performed.

In this way, in this embodiment, the rebar 50 to be cut is pre-positioned by the positioning member 20 relative to the lower blade 11, which has multiple R-shaped concave surfaces 11d arranged side by side, so that the rebar 50 to be cut can be automatically placed within the R-shaped concave surface 11d.
In addition, the lower blade 11 can be directly inserted from a conveyor or other transport device because the upper end 11t of the lower blade 11 is set at a lower position than the insertion side holding part 21 of the rebar 50 to be cut in the standby position before the rebar 50 is inserted. Furthermore, when the lower blade 11 is moved in a direction perpendicular to the longitudinal direction of the rebar 50 to be cut (rebar radial direction) by the insertion side holding part 21, it can be moved without coming into contact with the lower blade 11. As a result, the rebar 50 to be cut can be automatically inserted into and moved to the cutting position.

In addition, in this embodiment, the first position control part 28 and the positioning member 20 can control the position of the rebar 50 to be cut at a predetermined position in the radial direction of the rebar before cutting is performed, which allows the rebar 50 to be cut to fit smoothly into the R-shaped concave surface 11d.

In this embodiment, the pitch P of the R-shaped concave surface 11d of the lower blade 11 is configured to be equal to the outer diameter of the rebar 50 to be cut, so that the rebar 50 to be cut automatically enters the R-shaped concave surface 11d as the lower blade 11 moves upward.

In addition, in this embodiment, the positioning member 20 is provided upstream of the lower blade 11 where the rebar 50 to be cut is inserted, allowing the rebar 50 to be cut to be accurately positioned. The positioning member 20 can also be used as a position control means when inserting the rebar.

As in this embodiment, the positioning member 20 also has a third position regulating portion 20c on the opposite side of the lower blade 11 from the insertion side holding portion 21, so that the rebar 50 to be cut can be positioned in front of and behind the cutting blade, allowing for more reliable position regulation.

In addition, as in this embodiment, the portion of the lower blade 11 that constitutes the upper end portion 11t between adjacent R-shaped concave surfaces 11d is configured as a curved surface that bulges toward the rebar in the opposite direction to the curvature of the R-shaped concave surfaces 11d, making it easier to fit the rebar 50 to be cut that is positioned on the lower blade 11 into the R-shaped concave surfaces 11d.

Although one embodiment of the present invention has been described above, the present invention is not limited to this, and can be modified as appropriate within the scope of the present invention. For example, in the above embodiment, only the lower blade 11 is configured to be driven, but the upper blade 12 may also be configured to be driven together with the lower blade 11. For example, the lower blade 11 may be raised until the bottom end of the R-shaped concave surface 11d of the lower blade 11 reaches the insertion side holding portion 21, and then the upper blade 12 may be lowered to cut the rebar.

Furthermore, it is also possible to fix the lower blade 11 and drive only the upper blade 12. In that case, the lower blade 11 is fixed at a position where the upper end of the lower blade 11 does not exceed the vertical position of the insertion side holding part 21, and the insertion side holding part 21 is supported by a damper member (not shown) such as an air cylinder. By adopting such a configuration, the configuration of the driving member can be simplified while the radial movement of the rebar 50 to be cut can be performed smoothly.

In addition, in the above embodiment, the second position regulating portion 20b is provided on the upstream side of the lower blade 11, and the third position regulating portion 20c is provided on the downstream side, but these position regulating portions may be provided on either the upstream side or downstream side of the lower blade 11.

In addition, in the above embodiment, a case where two reinforcing bars 50 to be cut are cut simultaneously is described, but this is not necessarily limited to this, and it is possible to cut as many reinforcing bars as there are R-shaped concave surfaces 11d at the same time.

In addition, in the above embodiment, the pitch P of the R-shaped concave surface 11d is the same as the rebar diameter, but even if the pitch P of the R-shaped concave surface 11d does not match the rebar diameter, for example, if the rebar diameter is smaller than the pitch P, the upper end 11t is configured as a curved surface that bulges upward (toward the rebar), so that the rebar to be cut 50 fits smoothly into the R-shaped concave surface 11d.

1 Rebar cutting machine 2 Cutting machine body 3 Lower blade support part (cutting blade driving member)
11 Lower blade 11d R-shaped concave surface 11t Upper end portion 12 Upper blade 20 Positioning member 20b Second position restricting portion 20c Third position restricting portion 21 Insertion side holding portion 28 First position restricting portion 50 Reinforcing bar to be cut (reinforcing bar)

Claims (7)

A rebar cutting machine having an upper blade and a lower blade that are relatively movable in the vertical direction and are offset in the longitudinal direction when cutting a rebar to be cut,
A cutting blade driving member that moves the lower blade in a vertical direction;
a positioning member that moves the rebar to be cut inserted between the upper blade and the lower blade in a radial direction of the rebar to be cut,
The upper blade and the lower blade have cutting edges along a direction perpendicular to the longitudinal direction of the rebar to be cut,
The positioning member restricts the movement of the reinforcing bar to be cut in the radial direction after the reinforcing bar is moved in the radial direction,
The lower blade is composed of an R-blade having a plurality of R-shaped concave surfaces arranged side by side to receive the reinforcing bar to be cut,
The cutting blade driving member moves the lower blade to a position not exceeding the vertical position of the insertion side holding portion of the rebar to be cut at a standby position before the rebar to be cut is inserted.
Rebar cutting machine. The rebar cutting machine according to claim 1,
the cutting blade driving member drives only the lower blade of the upper blade and the lower blade,
The rebar to be cut, whose position is restricted by the positioning member, is cut by moving the lower blade vertically upward by the cutting blade driving member.
Rebar cutting machine. The rebar cutting machine according to claim 1 or 2,
The cutting tool further includes a first position regulating portion at a position facing the positioning member across the rebar to be cut, the first position regulating portion regulating the radial position of the rebar to be cut.
Rebar cutting machine. The rebar cutting machine according to any one of claims 1 to 3,
A rebar cutting machine, wherein the pitch of the R-shaped concave surface of the lower blade is configured to be equal to the outer diameter of the rebar to be cut. The rebar cutting machine according to any one of claims 1 to 4,
The positioning member is provided on at least one of an upstream side and a downstream side with respect to the lower blade.
Rebar cutting machine. The rebar cutting machine according to claim 5,
The positioning member includes a third position restricting portion on the opposite side of the lower blade from the insertion side holding portion.
Rebar cutting machine. The rebar cutting machine according to any one of claims 1 to 6,
The lower blade has a portion constituting an upper end between adjacent R-shaped concave surfaces, the portion being configured as a curved surface that bulges in a direction opposite to the curvature direction of the R-shaped concave surfaces.
Rebar cutting machine.

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