Steel bar hoop bending head center shaft

Abstract

The utility model provides a steel bar bent hoop head center shaft which comprises a shaft body, the shaft body is divided into a connector making contact with a rotating block and a bent portion making contact with a steel bar, a threaded hole is formed in the shaft body in the axial direction, a matched screw is connected into the threaded hole in a threaded mode, and the length of the threaded hole and the length of the portion, stretching into the threaded hole, of the screw are larger than the length of the connector. The inner diameter of the threaded hole is smaller than the head outer diameter of the screw. When the hoop bending head bends a reinforcing steel bar and the stress is greater than the maximum bearing strength of the central shaft, the central shaft is broken off; and the broken part is usually the joint of the connector and the bending part. Due to the fact that the screw is in threaded connection with the interior of the bent portion, and the inner diameter of the threaded hole is smaller than the outer diameter of the head of the screw, even if the center shaft is broken, the screw connecting the bent portion and the connector cannot be broken, the bent portion can be pulled by the screw, and the screw is clamped on the connector and prevented from flying out to hurt people.

Description

Technical Field

[0001] This utility model relates to the field of rebar bending machines, and in particular to the central shaft structure on the bending head of a rebar bending machine. Background Technology

[0002] The central shaft of the existing rebar bending machine's bending head is simply a round shaft. This shaft is inserted into a hole in the rotating block and then fixed by radial screws to achieve the connection between the central shaft and the rotating block. However, because the central shaft experiences significant stress during the bending process, it is prone to breakage if workers do not follow operating procedures or violate regulations. A broken shaft could potentially fly towards a person, causing injury and leading to unnecessary production accidents. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a relatively safe central shaft for rebar bends.

[0004] This utility model achieves the above objectives as follows:

[0005] The central shaft of the rebar bend includes a shaft body, which is divided into a connector that contacts the rotating block and a bent part that contacts the rebar. The shaft body has a threaded hole along the axial direction, and a matching screw is screwed into the threaded hole. The length of the threaded hole and the screw extending into the threaded hole is greater than the length of the connector, and the inner diameter of the threaded hole is less than the outer diameter of the screw head.

[0006] A small section of the screw body near the screw head protrudes from the end of the connector.

[0007] One section of the screw body is not threaded.

[0008] The connector head is provided with a countersunk hole or an annular groove.

[0009] The connector is thicker than the bent portion.

[0010] The screw is only screwed into the threaded hole inside the bend.

[0011] The beneficial effects of this invention are as follows: When the bending head is bending a reinforcing bar, if the stress exceeds the maximum bearing capacity of the central shaft, the central shaft will break; and the breakage point is often the connection between the connector and the bending part. Because a screw is screwed into the inside of the bending part, and the inner diameter of the threaded hole is smaller than the outer diameter of the screw head, even if the central shaft breaks, the screw connecting the bending part and the connector will not break. It will pull the bending part and lock it into the connector, preventing it from flying out and injuring people. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0013] Fig. 1 This is a three-dimensional structural diagram of the present invention;

[0014] Fig. 2 This is a cross-sectional view of the present invention;

[0015] Fig. 3 This is a schematic diagram of the structure of this utility model applied to a bending hoop. Detailed Implementation

[0016] Reference Figs. 1 to 3 The central shaft of the rebar bending head includes a shaft body, which is divided into a connecting head 1 that contacts the rotating block 9 and a bending part 2 that contacts the rebar. The shaft body has a threaded hole 3 along its axial direction, and a matching screw 4 is screwed into the threaded hole 3. The length of the threaded hole 3 and the screw 4 extending into the threaded hole is greater than the length of the connecting head 1, and the inner diameter of the threaded hole 3 is less than the outer diameter of the head 5 of the screw 4. When the bending head bends the rebar, if the stress exceeds the maximum bearing capacity of the central shaft, the central shaft will break; the breakage point is often the connection between the connecting head 1 and the bending part 2. Because the bending part 2 is screwed with a screw 4, and the inner diameter of the threaded hole is less than the outer diameter of the head of the screw 4, even if the central shaft breaks, the screw connecting the bending part 2 and the connecting head 1 will not break. It will pull the bending part 2 and lock it into the connecting head, preventing it from flying out and injuring someone.

[0017] Among them, a small section of the screw body 6 near the head 5 of the screw 4 protrudes from the end of the connector 1. When the central shaft is broken, the protruding small section of the screw body 6 will be pulled into the connector 1, reducing some of the kinetic energy of the bent part 2 flying out. The head 5 of the screw 4 is stuck at the end of the connector 1, which can further effectively prevent the bent part 2 from breaking free from the screw 4 and flying towards the human body.

[0018] To further and more effectively prevent the bent part 2 from breaking free of the screw 4 and flying towards the human body, the small section of the screw body 6 is not threaded, which can more effectively buffer and reduce some of the kinetic energy of the bent part 2 flying out.

[0019] In addition, the connector 1 is provided with a countersunk hole 7 or an annular groove 8. When the central shaft is installed on the rotating block of the bent head, and the locking screw is screwed into the countersunk hole 7 or annular groove 8 along the radial screw hole of the rotating block, the central shaft can be connected with the rotating block 9 to prevent the central shaft from coming off.

[0020] In order to precisely control the location of the break in the central shaft and effectively control the bending part from flying toward the human body, the connector 1 is thicker than the bending part 2. At this time, the location of the break in the central shaft is often the connection between the bending part and the connector.

[0021] As described above, in order to reduce some of the kinetic energy of the bent part 2 flying out and effectively prevent the bent part 2 from breaking free from the screw 4 and flying towards the human body, the screw 4 is only screwed into the threaded hole 3 inside the bent part 2.

Claims

1. A central shaft for a steel bar bend, comprising a shaft body, said shaft body being divided into a connecting head (1) that contacts a rotating block (9) and a bent portion (2) that contacts a steel bar, characterized in that: The shaft body has a threaded hole (3) along the axial direction. A matching screw (4) is screwed into the threaded hole (3). The length of the threaded hole (3) and the screw (4) extending into the threaded hole is greater than the length of the connector (1). The inner diameter of the threaded hole (3) is less than the outer diameter of the head (5) of the screw (4).

2. The central axis of the reinforcing bar bend head according to claim 1, characterized in that: A small section of the screw body (6) near the head (5) of the screw (4) protrudes from the end of the connector (1).

3. The central axis of the reinforcing bar bend head according to claim 2, characterized in that: The small section of the screw body (6) has no threads.

4. The central axis of the reinforcing bar bend head according to claim 1, 2 or 3, characterized in that: The connector (1) is provided with a countersunk hole (7) or an annular groove (8).

5. The central axis of the reinforcing bar bend head according to claim 1, characterized in that: The connector (1) is thicker than the bend (2).

6. The central axis of the reinforcing bar bend head according to claim 1, characterized in that: The screw (4) is screwed only into the threaded hole (3) inside the bent part (2).

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