Auxiliary tool for secondary bending of steel bars and manufacturing method thereof

Abstract

The present invention discloses an auxiliary tool for secondary bending of steel bars, comprising a steel bar body and a cylinder. The steel bar body comprises a straight section and pre-bent section 1 and pre-bent section 2 formed by bending at both ends of the straight section, and also comprises a support member and a short rod and a long rod respectively hinged to the support member at one end. The other end of the short rod is bent to form a circular ring member, and the circular ring member is sleeved on the long rod; a guide sleeve is welded at one end of the support member; the pre-bent section 2 of the steel bar body passes through the guide sleeve and is clamped between the cylinder and the long rod. The bending angle is cleverly converted into length by using the trigonometric function relationship. The on-site personnel can directly obtain the required secondary bending angle by reading the paper ruler scale corresponding to the circular ring member sliding on the long rod. The method is intuitive and the result is accurate, the structure is clever, and the measurement is convenient. The present invention also discloses a method for making the above-mentioned auxiliary tool for secondary bending of steel bars. The raw materials can be obtained locally, the production is completed on-site, and it is easy to implement.

Description

Technical Field

[0001] The invention relates to the field of building construction equipment, and in particular to an auxiliary tool for secondary bending of steel bars and a manufacturing method thereof. Background Art

[0002] Hooks are indispensable in the design of foundation rafts, walls, columns and slabs of construction projects. The binding of steel tie bars must be hooked at the intersection of the main bars of the foundation or wall, and the angle of the hooks at both ends is 135°. Generally, steel bar hooks are processed and manufactured to bend at both ends of the straight section, with a 135° hook at one end, called pre-bend section 1, and a 90° hook at the other end, called pre-bend section 2. After the hook is installed, pre-bend section 2 needs to be bent again.

[0003] Traditional secondary bending of steel bars, on the one hand, relies on manual labor, which is difficult because it involves the control of the bending angle. It is not easy to grasp the bending angle if it is done manually without auxiliary tools, and it often requires the cooperation of two or even more people to complete. On the other hand, it relies on steel bar bending equipment, such as the patent document with publication number CN2196521, which discloses an improved structure of a steel bar bending machine, which is mainly composed of a bending device, an electromagnetic pulling mechanism and a return switch group. The touch switch on each angle adjustment plate in the return switch group is connected to the The electromagnet, pedal and power supply in the electromagnetic pulling mechanism form a series circuit. When the pedal switch is turned on, the moving arm rotates, bending the steel bar and rotating the return switch group. During the rotation, when the contact block touches the switch, the clutch disk and the gear disk stop engaging, and the moving arm returns to its original position. At the same time, the steel bar is bent once. This type of steel bar bending device has the advantages of high control and precise bending, but its structure is complex and the cost is high. Especially for occasions where secondary bending work is required after the hook is installed, this type of steel bar bending machine is not suitable. Summary of the invention

[0004] In order to solve the problems mentioned in the background technology, the present invention proposes an auxiliary tool for secondary bending of steel bars and a manufacturing method thereof, which can achieve precise bending of a given angle, is convenient for measurement, and has a simple manufacturing method, with locally available raw materials, low cost, and relatively easy implementation.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] An auxiliary tool for secondary bending of steel bars, comprising a steel bar body and a cylinder vertically fixed on the ground or a workbench, wherein the steel bar body comprises a straight section and pre-bent sections 1 and 2 formed by bending at two ends of the straight section, respectively, and further comprises a support member and a short rod and a long rod respectively hinged to the support member at one end, wherein one end of the short rod hinged to the support member is a hinged end and the other end is a free end, and one end of the long rod hinged to the support member is a hinged end and the other end is a free end;

[0007] The free end of the short rod is bent to form a circular ring, and the circular ring is sleeved on the long rod;

[0008] One end of the support member close to the hinged end of the long rod is a positioning end, and the other end is an operating end. A guide sleeve is welded to the positioning end of the support member. The guide sleeve is an internal hollow structure, one end of which is an inlet end and the other end is an outlet end.

[0009] The cylinder is located on one side of the inlet end of the guide sleeve, and the second pre-bent section of the steel bar body passes through the guide sleeve and is correspondingly clamped between the cylinder and the long rod.

[0010] Furthermore, the distance from the hinge of the long rod and the support member to the hinge of the short rod and the support member is equal to the distance from the hinge of the short rod and the support member to the center of the circular ring member sleeved on the long rod.

[0011] Furthermore, a group of nuts are respectively arranged at the position where the long rod is hinged on the support member and at the position where the short rod is hinged on the support member, and the number of nuts in the same group is two and they are arranged in parallel and spaced apart;

[0012] A pin is welded to the hinged ends of the short rod and the long rod respectively, and both ends of each pin are respectively inserted into two nuts of the same group.

[0013] Furthermore, the outlet end of the guide sleeve is flush with a corresponding end of the support member.

[0014] Furthermore, the short rod and the circular ring are an integrated structure, and the long rod is provided with scale lines.

[0015] Furthermore, the guide sleeve is arranged parallel to the support member.

[0016] The present invention also discloses a method for manufacturing the auxiliary tool for secondary bending of steel bars, comprising the following steps:

[0017] Step 1:

[0018] Take a round steel bar with a diameter of 25 mm and cut it three times, the cut lengths are 1100 mm, 1100 mm, and 50 mm respectively, align the two round steel bars with a length of 1100 mm and a diameter of 25 mm and weld them side by side to form the support member, then fix another round steel bar with a length of 50 mm and a diameter of 25 mm vertically on the ground or a workbench to form the column, and the support member is placed flat on the ground or a workbench;

[0019] Step 2: Take four M10 nuts and place them vertically on the support in groups of two. The distance between the centers of the two groups of nuts should be 500mm, and the distance from the center of one group of nuts to one end of the support in step 1 should be 100mm.

[0020] Step 3: Take a round steel bar with a diameter of 8mm and cut it four times. The cut lengths are 30mm, 30mm, 1030mm and 550mm respectively. Among them, two round steel bars with a length of 30mm and a diameter of 8mm are used as pins, a round steel bar with a length of 1030mm and a diameter of 8mm is used as a long rod, and a round steel bar with a length of 550mm and a diameter of 8mm is used as a short rod; then weld the two pins to the long rod and the short rod respectively;

[0021] Step 4: After the long rod is welded to the pin, a 1000mm long paper ruler with scale lines is pasted on the long rod and wrapped with transparent tape for protection. The zero scale of the paper ruler is the center of the pin on the short rod; after the short rod is welded to the pin, the end of the short rod away from the pin is bent to form the circular ring. After bending, the distance from the center of the circular ring to the center of the pin is required to be 500mm, and the inner diameter of the circular ring is 14.5-15.5mm to ensure that it can slide on the long rod;

[0022] Step 5: Insert the pins in step 3 into the two nuts in the same group respectively, and pass the long rod welded in step 4 through the circular ring in step 3, and assemble them with the support in step 1 and the nut in step 2 in sequence; after the assembly is completed, weld the nut to fix it;

[0023] Step six: Select an internal threaded sleeve of M25 and an outer diameter of 37 mm, cut a length of 60 mm, and obtain the guide sleeve. Then, align one end of the guide sleeve with one end of the support and weld it to the support to complete the production.

[0024] Through the above technical solution, the beneficial effects of the present invention are:

[0025] 1. The present invention passes the second pre-bent section of the steel bar body to be bent through a guide sleeve and is clamped between a cylinder and a long rod. The operating end of the support member is held and the support member is rotated clockwise. In this way, according to the principle of lever and the principle of moment, the second pre-bent section of the steel bar body is rotated around the cylinder. As the support member continues to rotate, the second pre-bent section is bent with the cylinder as a fulcrum to achieve secondary bending. In addition, the bending angle can be conveniently limited during the rotation process. Compared with the traditional method of relying solely on manual labor without auxiliary tools, the efficiency of secondary bending of steel bars is greatly improved.

[0026] 2. The present invention uses trigonometric function relationships to cleverly convert the bending angle into length. On-site personnel can directly read the paper ruler scale corresponding to the circular ring member sliding on the long rod, and can directly obtain the required secondary bending angle based on the conversion relationship between angle and length. It is intuitive and the results are accurate, the structure is clever, and the measurement is convenient;

[0027] 3. The raw materials used for each component can be obtained locally, and the cost of making the entire tool is low and relatively easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of an auxiliary tool for secondary bending of steel bars in an embodiment of the present invention.

[0029] Figure 2 It is a schematic diagram of the distribution of circular rings and pins on a short rod in an auxiliary tool for secondary bending of steel bars in an embodiment of the present invention.

[0030] Figure 3 It is a schematic diagram of the distribution of pins on a long rod in an auxiliary tool for secondary bending of steel bars in an embodiment of the present invention.

[0031] Figure 4 It is a schematic diagram of the distribution of a guide sleeve and a nut on a support member in an auxiliary tool for secondary bending of steel bars in an embodiment of the present invention.

[0032] Figure 5 It is a schematic diagram of the application principle of an auxiliary tool for secondary bending of steel bars in an embodiment of the present invention.

[0033] The reference numerals in the accompanying drawings are:

[0034] 1 is the steel bar body, 101 is the straight line segment, 102 is the pre-bent segment 1, 103 is the pre-bent segment 2, 2 is the support member, 3 is the short rod, 4 is the long rod, 5 is the circular ring member, 6 is the guide sleeve, 7 is the cylinder, 8 is the nut, and 9 is the pin. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0036] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "horizontal", "vertical" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] like Figure 1 to Figure 5 As shown, an auxiliary tool for secondary bending of steel bars comprises a steel bar body 1 and a cylinder 7 vertically fixed on the ground or a workbench, wherein the steel bar body 1 comprises a straight segment 101 and a pre-bent segment 1 102 and a pre-bent segment 2 103 formed by bending at two ends of the straight segment 101, and further comprises a support member 2 and a short rod 3 and a long rod 4 respectively hinged to the support member 2 at one end, wherein one end of the short rod 3 hinged to the support member 2 is a hinged end and the other end is a free end, and one end of the long rod 4 hinged to the support member 2 is a hinged end and the other end is a free end;

[0038] The free end of the short rod 3 is bent to form a circular ring 5, and the circular ring 5 is sleeved on the long rod 4;

[0039] One end of the support member 2 close to the hinged end of the long rod 4 is a positioning end, and the other end is an operating end. A guide sleeve 6 is welded to the positioning end of the support member 2. The guide sleeve 6 is an internal hollow structure, one end of which is an inlet end and the other end is an outlet end.

[0040] At one side of the cylinder 7 close to the inlet end of the guide sleeve 6 , the second pre-bent section 103 of the steel bar body 1 passes through the guide sleeve 6 and is correspondingly clamped between the cylinder 7 and the long rod 4 .

[0041] Furthermore, the distance from the hinge of the long rod 4 and the support member 2 to the hinge of the short rod 3 and the support member 2 is equal to the distance from the hinge of the short rod 3 and the support member 2 to the center of the circular ring member 5 sleeved on the long rod 4.

[0042] Furthermore, a group of nuts 8 are respectively arranged at the position where the support member 2 is hinged with the long rod 4 and at the position where the support member 2 is hinged with the short rod 3. The number of nuts 8 in the same group is two and they are arranged in parallel and spaced apart.

[0043] A pin 9 is welded to the hinged ends of the short rod 3 and the long rod 4 respectively, and both ends of each pin 9 are respectively inserted into two nuts 8 of the same group.

[0044] Furthermore, the outlet end of the guide sleeve 6 is flush with a corresponding end of the support member 2 .

[0045] Furthermore, the short rod 3 and the circular ring 5 are an integrated structure, and the long rod 4 is provided with scale lines.

[0046] Furthermore, the guide sleeve 6 is arranged parallel to the support member 2 .

[0047] This embodiment also discloses a method for making the above-mentioned auxiliary tool for secondary bending of steel bars, comprising the following steps:

[0048] Step 1:

[0049] Take a round steel bar with a diameter of 25 mm and cut it three times, the cut lengths are 1100 mm, 1100 mm, and 50 mm respectively, align the two round steel bars with a length of 1100 mm and a diameter of 25 mm and weld them side by side to form the support member 2, then fix another round steel bar with a length of 50 mm and a diameter of 25 mm vertically on the ground or a workbench to form the column 7, and the support member 2 is placed flat on the ground or a workbench;

[0050] Step 2: Take four M10 nuts 8 and place them vertically on the support 2 in groups of two. The distance between the centers of the two groups of nuts 8 is 500 mm, and the distance from the center of one group of nuts 8 to one end of the support 2 in step 1 is 100 mm.

[0051] Step 3: Take a round steel bar with a diameter of 8 mm and cut it four times, the cut lengths are 30 mm, 30 mm, 1030 mm, and 550 mm respectively, among which two round steel bars with a length of 30 mm and a diameter of 8 mm are used as pins 9, a round steel bar with a length of 1030 mm and a diameter of 8 mm is used as a long rod 4, and a round steel bar with a length of 550 mm and a diameter of 8 mm is used as a short rod 3; then weld the two pins 9 to the long rod 4 and the short rod 3 respectively;

[0052] Step 4: After the long rod 4 is welded to the pin 9, a 1000mm long paper ruler with scale lines is pasted on the long rod 4 and wrapped with transparent tape for protection. The zero scale of the paper ruler is the center of the pin 9 on the short rod 3; after the short rod 3 is welded to the pin 9, the end of the short rod 3 away from the pin 9 is bent to form the circular ring 5. After bending, the distance from the center of the circular ring 5 to the center of the pin 9 is required to be 500mm, and the inner diameter of the circular ring is 14.5-15.5mm to ensure that it can slide on the long rod 4;

[0053] Step 5: Insert the pins 9 in step 3 into the two nuts 8 in the same group respectively, and pass the long rod 4 welded in step 4 through the circular ring 5 in step 3, and assemble them with the support 2 in step 1 and the nuts 8 in step 2 in sequence; after the assembly is completed, weld the nuts 8 to fix them;

[0054] Step six: Select an internal threaded sleeve of M25 and an outer diameter of 37 mm, cut a length of 60 mm, and obtain the guide sleeve 6. Then, align one end of the guide sleeve 6 with one end of the support member 2 and weld it to the support member 2 to complete the production.

[0055] After the tool is made, the long rod 4 is fixed according to the position of the cylinder 7 on the ground or the workbench. After fixation, the ring is required to be able to slide on the long rod 4. When using it, please refer to Figure 1 , pass the pre-bent section 2 103 of the steel bar body 1 to be bent through the guide sleeve 6, and hold the operating end of the support member 2. According to the principle of lever, this is more labor-saving than holding the middle or other parts of the support member 2. When bending, since the pre-bent section 2 103 of the steel bar body 1 passes through the guide sleeve 6 and is clamped between the cylinder 7 and the long rod 4, the pre-bent section 2 103 of the steel bar body 1 rotates around the cylinder 7 by the principle of torque. As the support member 2 continues to rotate, the pre-bent section 2 103 is bent with the cylinder 7 as the fulcrum to achieve secondary bending. It should be noted that in order to ensure that the pre-bent section 1 102 of the steel bar body 1 cannot rotate by itself during the bending process, the pre-bent section 1 102 can be fixed by tying, stepping on, or adding a cylinder 7 on the other side of the steel bar body 1 during operation. This will not be repeated here.

[0056] In the present invention, the bending angle of the steel bar is controlled according to the position scale of the circular ring member 5 when sliding on the long rod 4 through the relationship of trigonometric functions, and the steel bar can be bent into place by rotating the support member 2 once; for details, please refer to Figure 5 In the figure, a is the distance from the hinge of the long rod 4 and the support member 2 to the hinge of the short rod 3 and the support member 2, b is the distance from the hinge of the short rod 3 and the support member 2 to the center of the circular ring member 5 sleeved on the long rod 4, c is the distance from the hinge of the long rod 4 and the support member 2 to the center of the circular ring member 5 sleeved on the long rod 4, θ is the angle between the long rod 4 and the support member 2, when the angle θ is 0-90°, according to the trigonometric function relationship: , then when a=b, .

[0057] Specifically, a in the present invention is 500 mm, and the conversion relationship between θ and c is as follows:

[0058] Angle θ 5° 10° 15° 20° 25° 30° 35° 40° 45° Length c 999mm 985 mm 966 mm 940 mm 906 mm 866 mm 819 mm 766 mm 707 mm Angle θ 50° 55° 60° 65° 70° 75° 80° 85° 90° Length c 643 mm 574 mm 500 mm 423 mm 345 mm 259 mm 173 mm 87 mm 0mm

[0059] Therefore, when the support member 2 is rotated, the circular ring member 5 slides on the long rod 4. According to the angle θ in the above table, the length c corresponding to 45° is 707mm. By observing that the circular ring member 5 slides to the scale line 707mm on the paper ruler, the support member 2 is stopped, and a precise secondary bending of the steel bar at 45° is achieved. This is intuitive, reliable, and accurate, and the entire operation process can be completed by one person, which greatly reduces the labor input, improves the efficiency of the secondary bending of the steel bar, and reduces the construction cost.

[0060] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. An auxiliary tool for secondary bending of a steel bar, comprising a steel bar body (1) and a cylinder (7) vertically fixed on the ground or a workbench, wherein the steel bar body (1) comprises a straight section (101) and two pre-bent sections (102) and (103) formed by bending at two ends of the straight section (101), characterized in that: It also comprises a support member (2) and a short rod (3) and a long rod (4) each having one end hinged to the support member (2), wherein the end of the short rod (3) hinged to the support member (2) is a hinged end and the other end is a free end, and the end of the long rod (4) hinged to the support member (2) is a hinged end and the other end is a free end; The free end of the short rod (3) is bent to form a circular ring (5), and the circular ring (5) is sleeved on the long rod (4); One end of the support member (2) close to the hinged end of the long rod (4) is a positioning end, and the other end is an operating end. A guide sleeve (6) is welded to the positioning end of the support member (2). The guide sleeve (6) is an internal hollow structure, one end of which is an inlet end, and the other end is an outlet end. At a position on one side of the cylinder (7) close to the inlet end of the guide sleeve (6), the second pre-bent section (103) of the steel bar body (1) passes through the guide sleeve (6) and is correspondingly clamped between the cylinder (7) and the long rod (4).

2. The auxiliary tool for secondary bending of steel bars according to claim 1, characterized in that: The distance from the hinge of the long rod (4) and the support member (2) to the hinge of the short rod (3) and the support member (2) is equal to the distance from the hinge of the short rod (3) and the support member (2) to the center of the circular ring member (5) sleeved on the long rod (4).

3. The auxiliary tool for secondary bending of steel bars according to claim 1, characterized in that: A group of nuts (8) is respectively arranged at a position on the support member (2) where the long rod (4) is hinged, and at a position on the support member (2) where the short rod (3) is hinged, and the number of nuts (8) in the same group is two and they are arranged in parallel and at intervals; A pin shaft (9) is welded to the hinged ends of the short rod (3) and the long rod (4), respectively, and both ends of each pin shaft (9) are respectively inserted into two nuts (8) of the same group.

4. The auxiliary tool for secondary bending of steel bars according to claim 1, characterized in that: The outlet end of the guide sleeve (6) is flush with a corresponding end of the support member (2).

5. The auxiliary tool for secondary bending of steel bars according to claim 1, characterized in that: The short rod (3) and the circular ring (5) are an integrated structure, and the long rod (4) is provided with scale lines.

6. The auxiliary tool for secondary bending of steel bars according to claim 1, characterized in that: The guide sleeve (6) is arranged parallel to the support member (2).

7. A method for manufacturing an auxiliary tool for secondary bending of steel bars according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Take a round steel bar with a diameter of 25 mm and cut it three times, the cut lengths being 1100 mm, 1100 mm and 50 mm respectively, align the two round steel bars with a length of 1100 mm and a diameter of 25 mm and weld them side by side to form the support member (2), then fix another round steel bar with a length of 50 mm and a diameter of 25 mm vertically on the ground or a workbench to form the column (7), and place the support member (2) flat on the ground or the workbench; Step 2: Take four M10 nuts (8), place them vertically on the support (2) in groups of two, with the center distance between the two groups of nuts (8) being 500 mm, and the distance from the center of one group of nuts (8) to one end of the support (2) in step 1 being 100 mm; Step 3: Take a round steel bar with a diameter of 8 mm and cut it four times, the cut lengths being 30 mm, 30 mm, 1030 mm and 550 mm respectively, wherein two round steel bars with a length of 30 mm and a diameter of 8 mm are used as pins (9), a round steel bar with a length of 1030 mm and a diameter of 8 mm is used as a long rod (4), and a round steel bar with a length of 550 mm and a diameter of 8 mm is used as a short rod (3); then, the two pins (9) are welded to the long rod (4) and the short rod (3) respectively; Step 4: After the long rod (4) and the pin (9) are welded, a 1000 mm long paper ruler with scale lines is pasted on the long rod (4) and wrapped with transparent tape for protection, and the zero scale of the paper ruler is the center of the pin (9) on the short rod (3); after the short rod (3) and the pin (9) are welded, the end of the short rod (3) away from the pin (9) is bent to form the circular ring (5), and after bending, the distance from the center of the circular ring (5) to the center of the pin (9) is required to be 500 mm, and the inner diameter of the circular ring is 14.5 to 15.5 mm to ensure that it can slide on the long rod (4); Step 5: insert the pins (9) in step 3 into the two nuts (8) in the same group respectively, pass the long rod (4) welded in step 4 through the circular ring (5) in step 3, and assemble them with the support (2) in step 1 and the nut (8) in step 2 in sequence; after the assembly is completed, weld the nut (8) to fix it; Step 6: Select an internal threaded sleeve of M25 and an outer diameter of 37 mm, cut a length of 60 mm, and obtain the guide sleeve (6). Then, align one end of the guide sleeve (6) with one end of the support member (2) and weld them to the support member (2) to complete the production.

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