RU2521910C1 - Hand pipe bender - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming particularly to pipe bending and can be sued for repair and construction. Flanged bending gage and reeling roll have teeth cut over cylindrical surface to displace reeling roll over bending gage are interconnected by two plates to run there between for interaction of roll teeth with those of banding gage. Note here that bending gage and reeling roll have central square-shape bores with cylindrical ledges made there around while two square-shape bores are made at plate ends to receive ledges and to connect said plates with reeling roll and bending gage designed to accommodate the tools for rotation of reeling roll over the bending gage.

EFFECT: lower applied forces and costs.

8 cl, 5 dwg

Description

The invention relates to devices for metal forming, in particular for bending pipes by hand, and can find application in repair and construction works.

Known manual pipe bender [GALPERIN A.I. Machines and equipment for bending pipes. Moscow: Engineering, 1967, p. 36, Fig. 20].

The known device consists of the following main parts: a bracket in which a fixed roller (bending template) and a movable (rolling roller) are mounted on the axes, supports for attaching to a workbench and a clamp mounted on a stationary roller (bending template).

The disadvantage of the above analogue is that the device can only be used attached to a workbench (hard mount to a stationary surface).

Known manual pipe bender disclosed in [SU 1118450], selected as a prototype. Known manual pipe bender contains a pair of bending rollers (bending template and obkatny roller), made with flanges, on the cylindrical surface of which teeth are cut, designed to move the obkatny roller on the bending template.

The disadvantage of the prototype is that the pipe bender is bulky, metal-intensive, uncomfortable and unreliable in operation.

The objective of the invention is the development of the design of the pipe bender, which allows it to be used during repair and construction works for bending gas pipes GOST-3262 with a diameter of 21.3 mm at an angle of 90 degrees without reinstallation and up to 180 degrees with reinstallation.

The technical result is a reduction in the applied force when bending pipes, ease of use in the repair or installation area in a limited cramped space, in some cases welding, the weight of the tool and labor costs when using are excluded.

The problem is solved and the technical result is achieved in that, like the well-known proposed manual pipe bender, it contains a bending template and a roll-in roller made with flanges, on the cylindrical surface of which teeth are cut designed to move the roll-in roller along the bending template.

What is new is that the rolling roller and bending template are installed between two plates with the possibility of free rotation between them, allowing the interaction of the teeth of the rolling roller with the teeth of the bending template, the bending template and the rolling roller have central holes of a square shape around which protrusions of a cylindrical shape are made, and holes are made at both ends of the plates for the protrusions, with the help of which the plates are connected to the rolling roller and the bending template, forming two through holes of a square shape frames designed to accommodate tools for rotation of the rolling roller according to the bending template.

To ensure free rotation of the rolling roller and the bending template and fixing the plates from the outside in a recess made around the holes flush with the surface of the plates, flat round washers with square holes are installed, which are fixed with screws on the bending template and the rolling roller and combined with them square holes.

At the same time, on the flanges of the bending template, the teeth are made along an arc of a sector containing at least 115 degrees, which is sufficient for bending pipes by 90 degrees, and on the flanges of the rolling roller, the teeth are made around the entire circumference.

In addition, the pipe bender contains an additional planetary gearbox designed to rotate the rolling roller and move it along the bending template.

In this case, to rotate the rolling roller according to the bending template, an additional gearbox is used, having an output shaft of square cross section and a round cross-section rod made on the gear housing and mounted on the pipe bender by the output shaft into the hole of the rolling roller, and a round cross-section rod into the hole of the bending template.

In addition, a clamp is installed to secure the pipe to the bending template using an axis.

The bending template and the run-in roller are interconnected by teeth in such a way that they form a 2-row gear pair with a reduction of 1: 3.25.

To bend the pipe by 180 degrees, you must rearrange the pipe.

In the present invention, it is proposed to use the formed square through holes to install an additional gearbox, which is inserted on either side of the pipe bender into the hole of the rolling roller by the output shaft of square section, and into the hole of the bending template with a round rod. An additional gearbox is designed to rotate the run-in roller.

Through holes are designed to install as an additional gearbox for rotation obkatnogo roller, as well as fixtures for attachment to a workbench in case of stationary use.

For the operation of the device, the invention involves the use of a working lever installed in the socket of an additional gearbox.

A ratchet with a 1/2 "square (12.5 mm) with a handle length of up to 400 mm is used as a working lever.

The invention is further illustrated by graphic materials.

Figure 1 shows a side view and a section aa of the proposed manual pipe bender.

Figure 2 shows one of the possible schemes of bending pipes.

Figure 3 shows a section aa and the items included in the kit for using a pipe bender.

Figure 4 shows the assembly of the kit for bending pipes by hand.

Figure 5 shows the assembly of the kit for bending pipes on a workbench.

The proposed manual pipe bender (Fig. 1) contains a bending template 1 and a run-in roller 2, interconnected by two plates 3 using washers 4 and screws 5, a clamp 7 is installed on the bending template 1 using the axis 6.

The formed through holes of the square bender allow you to install an additional gearbox 8 and a fixture 9 for working on a workbench.

The bending template 1 and the run-in roller 2 are made of st.20 with subsequent cementation to a depth of 0.6 mm and heat treatment HRC 48 ... 50. Clamp 7, axis 6 and plate 3 are made of st.45 without heat treatment. The bending template 1 is made in the form of a sector (the inner bending radius is 45 mm without taking into account elastic deformations) and together with the rolling roller (30.5 mm in diameter) form a 2-row gear pair with a reduction of 1: 3.25. With a gap between the bending template and the roll-in roller of 36.7 mm, the bend shoulder is 53.5 mm.

As an additional gearbox 8, we used a modified key gearbox with an output shaft 10 of square cross section (http://www.avtotools.su/product/3332) with a reduction of 1: 3 (a round cross-section rod 11 was welded to the body without blocking the hole for the additional lever 13).

As a working lever 12, a ratchet for socket heads with a square 1/2 "(12.5 mm), extended to 400 mm, was used.

Manual pipe bender works as follows. The pipe starts up under the clamp 7 between the bending template 1 and the run-in roller 2, while the additional gearbox 8 (for example, a key-reducer) is inserted into the pipe bender from any convenient side, and the working lever 12 is inserted into the socket of the additional gearbox 8, while working with the lever 12 can be in any sector of the whole circle. When the reciprocating movement of the working lever 12, the rotation through an additional gearbox 8 is transmitted to the rolling roller 2, which bends (moving) along the gear sector of the bending template 1, bends the pipe.

When bending the pipe with hands, we used the option of the bender kit shown in Fig. 4, in opposition to the working lever 12, an additional lever 13 is used, which is inserted into the housing of the additional gearbox 8.

To work in stationary conditions, we used the version of the pipe bender kit shown in Fig. 5: in this case, use the device 9, which is a base in the form of a rectangular shape with a square rod in the middle, which can be clamped in a yew or screwed to the workbench, while the pipe bender is put on on a square rod bending template.

When bending pipes in the installation area of Fig. 2, counteraction to the working lever is not required, since the bent pipe 15 is welded to the mounted (fixed) pipe 14 (gas pipeline, water supply, etc.). In this case, the pipe 14 bends close to the welded joint; after bending by 90 degrees, the distance between the pipes is 73 mm. To remove the pipe bender in the case of work in accordance with figure 2, it is necessary to remove the axis 6 and remove the clamp 7.

Since a gear reducer with a total gear ratio of 1: 9.75 was formed in the proposed design, the force at the end of the working arm with a length of 400 mm is 12.7 kgf.

Claims (8)

1. A manual pipe bender containing a bending template and an obkatny roller made with flanges, on the cylindrical surface of which teeth are cut for the interaction of the obkatny roller with a bending template, characterized in that the obkatny roller and the bending template are connected by two plates with the possibility of free rotation between them, allowing the interaction of the teeth of the rolling roller with the teeth of the bending template, the bending template and the rolling roller have central holes of a square shape around which the protrusions of the cylindrical It has a shape of a mold, and at the ends of the plates under the said protrusions, two through holes of a square shape are made to connect the plates to the obkatny roller and the bending template and place the tool in them, which ensures rotation of the obkatny roller and the bending template. 2. The manual pipe bender according to claim 1, characterized in that it is equipped with flat round washers with square holes fixed with screws on the bending template and the obkatny roller and combined with their square holes to ensure free rotation of the obkatny roller and fixing the plates with their outer the sides in the recess made around the holes are flush with the surface of the plates. 3. Manual pipe bender according to claim 1 or 2, characterized in that the bending template is made in the form of a sector. 4. Manual pipe bender according to claim 3, characterized in that on the flanges of the bending template, the teeth are made in an arc of a sector of at least 115 °. 5. Manual pipe bender according to claim 1 or 2, characterized in that on the flanges of the rolling roller the teeth are made around the entire circumference. 6. The manual pipe bender according to claim 1, characterized in that a gearbox is used as a tool for rotating the rolling roller and according to the bending template. 7. The manual pipe bender according to claim 6, characterized in that the planetary gear type is used, having an output shaft of square cross section and a rod of circular cross section, made on the gear case. 8. A manual pipe bender according to claim 5, characterized in that a clamp mounted on an axis is used to fix the pipe on the bending template.

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