Special-shaped steel pipe fitting machining clamp

Abstract

The utility model relates to a special-shaped steel pipe fitting machining clamp which comprises a first end limiting assembly, a second end limiting assembly and a third end limiting assembly. A steel pipe limiting protrusion is formed in the center of the end face of the first end face limiting plate, and the lining column is formed in the center of the end face of the steel pipe limiting protrusion. At least one stage of first limiting convex ring is formed at the end part, connected with the steel pipe limiting bulge, in the lining column; and the second end limiting assembly at least comprises a limiting head detachably installed at the other end of the lining column, and at least one stage of second limiting convex ring matched with the limiting convex ring is formed on the circumferential surface of the limiting head. The first end limiting assembly and the second end limiting assembly which are of a specific structure are adopted to be matched, clamping of the two ends of the steel pipe fitting can be achieved, the clamping force is high, and the machining precision can be improved easily; and the device can adapt to steel pipe fittings with different diameters and is wide in application range.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining auxiliary parts and relates to a machining fixture, in particular to a machining fixture for special-shaped steel pipes. Background Art

[0002] Special-shaped steel pipes are seamless steel pipes that are cold-drawn into various shapes. This category also includes pipe fittings made from round steel pipes. Currently, special-shaped steel pipes are widely used in industries such as chemical and refrigeration, and are indispensable components for copper-clad steel pipeline connections.

[0003] The Chinese utility model patent with application number 202022010936.6 discloses a steel pipe processing fixture, including a fixed frame, a clamping cylinder fixedly installed at the middle position of the top inner cavity of the fixed frame, and a clamping block fixedly installed at the end of the piston at the bottom of the clamping cylinder, a screw rod and a sliding rod are arranged at the lower position of the inner cavity of the fixed frame, the screw rod is located at the upper position of the sliding rod, and a transmission sleeve is meshed and transmitted on the outer wall of the screw rod, and a sliding sleeve is slidably connected to the outer wall of the sliding rod. The transmission sleeve and the sliding sleeve are fixedly connected by a connecting rod, and two transmission sleeves and the sliding sleeve are symmetrically arranged respectively. A clamping block is also fixedly installed at the upper position of the sliding sleeve, a motor is installed at the lower position of the right side of the fixed frame, a first pulley is installed at one end of the output shaft on the right side of the motor, and a second pulley is installed at one end of the fixed frame on the right side of the screw rod. The first pulley and the second pulley are connected by belt drive. It has a simple structure, low production cost, and can adapt to steel pipes of different diameters. The Chinese utility model patent with application number 202110488490.4 discloses a thin-walled steel pipe processing fixture, comprising a vertical plate and an upper push plate, the upper push plate is movably connected to the vertical plate one by an expansion mechanism, the expansion mechanism comprising a horizontal axis, a fixed plate, a slider, a connecting rod one, a connecting rod two and a fixed rod, the slider slides to the right on the horizontal axis, the slider pushes the connecting rod one to move to the right, and the connecting rod two is flipped along the rotating connection point between the connecting rod two and the fixed plate under the action of the vertical direction component force of the connecting rod one, and the left end of the connecting rod two performs a circular motion, and the left end of the connecting rod two moves away from the horizontal axis, driving the upper push plate to slide on the right side wall of the vertical plate one, the upper push plate fits the inner wall of the steel pipe, and the outer circumferential surface of the upper push plate drags the steel pipe from the inner wall of the steel pipe, thereby fixing the steel pipe, and the force of the upper push plate dragging the steel pipe from the inside of the steel pipe is offset by the rigidity of the wall surface of the steel pipe itself, instead of clamping the steel pipe from the outer wall surface of the steel pipe, thereby preventing the steel pipe from deforming during the fixing process. However, the above patent applications all involve clamping and fixing the circumference of the pipe fitting, which will affect the efficiency of machining when the circumference of the pipe fitting needs to be machined. Summary of the Invention

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a special-shaped steel pipe processing fixture.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a special-shaped steel pipe processing fixture, which includes:

[0006] A first end limit assembly, comprising a first end limit plate and an inner liner column; a steel pipe limit protrusion is formed at the center of the end face of the first end limit plate, and the inner liner column is formed at the center of the end face of the steel pipe limit protrusion; at least one first limit protrusion ring is formed at the end of the inner liner column connected to the steel pipe limit protrusion;

[0007] The second end limit assembly includes at least a limit head detachably mounted on the other end of the liner column, and the circumferential surface of the limit head is formed with at least one second limit convex ring that cooperates with the limit convex ring.

[0008] Optimally, the first end surface limiting plate is provided with a plurality of mounting holes surrounding the steel pipe limiting protrusion.

[0009] Optimally, a plurality of planes arranged at intervals are provided on the circumferential surface of the first limiting protruding ring.

[0010] Optimally, a first avoidance groove extending to the limiting convex ring is provided on the circumferential surface of the lining column, and a first auxiliary limiting block extending into the first avoidance groove is formed on the end surface of the limiting convex ring.

[0011] Furthermore, at least one avoidance circular groove is provided on the circumferential surface of the lining column.

[0012] Furthermore, a second avoidance groove extending toward the second end limit assembly is provided on the circumferential surface of the lining column, and a second auxiliary limit block is provided in the second avoidance groove.

[0013] Furthermore, the inner thread of the limit head is connected to a threaded rod that cooperates with the lining column, and an adjusting nut located outside the limit head is installed on the threaded rod.

[0014] Furthermore, a plurality of avoidance grooves corresponding to the second avoidance grooves are provided on the circumferential surface of the limit head, and the avoidance grooves extend outward to pass through the second limit convex ring.

[0015] Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art: the special-shaped steel pipe processing fixture of the present invention can clamp the two ends of the steel pipe by cooperating with the first end limit component and the second end limit component of a specific structure. The clamping force is strong and is conducive to improving the machining accuracy; and it can be adapted to steel pipes of different diameters and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the special-shaped steel pipe fitting of the utility model;

[0017] Figure 2 This is a structural diagram of the special-shaped steel pipe processing fixture of the utility model. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0019] like Figure 1 The special-shaped steel pipe fitting 1' shown is a hollow tubular structure with notched grooves 11' extending toward each other at both ends; and a circular hole 12' is opened at the center of its circumference and penetrates the pipe wall of the special-shaped steel pipe fitting 1'; this circular hole 12' is located between the two notched grooves 11', so that the two notched grooves 11' are symmetrical about the axis of the circular hole 12'.

[0020] like Figure 2 The special-shaped steel pipe processing fixture shown is used to clamp steel pipes (which can be of different diameters) and is installed on a machining device to cooperate with the machining device to process them into Figure 1 The special-shaped steel pipe processing fixture includes a first end stop assembly 1 and a second end stop assembly 2 that match each other, thereby clamping the two end faces of the steel pipe to facilitate processing and improve machining accuracy, avoiding interference with the tool head of the machining equipment.

[0021] In this embodiment, the first end limit assembly 1 includes a first end face limit plate 12 and an inner liner column 11. A steel pipe limit protrusion 121 is formed at the center of the end face of the first end face limit plate 12 (the end face facing the inner liner column 11) (the steel pipe limit protrusion 121 and the first end face limit plate 12 are usually formed in one piece). Therefore, a plurality of mounting holes 122 can be opened on the first end face limit plate 12, so that these mounting holes 122 surround the steel pipe limit protrusion 121. In this way, the limit plate 12 (that is, the entire special-shaped steel pipe processing fixture) can be installed on the machining equipment with a corresponding number of bolts and other fasteners. The inner liner column 11 is formed (usually also formed in one piece, the same below) at the center of the end face of the steel pipe limit protrusion 121, so that the axis of the inner liner column 11 overlaps with the axis of the steel pipe limit protrusion 121. More importantly, the end of the lining column 11 connected to the steel pipe limiting protrusion 121 is formed with at least one first limiting protrusion ring 111. The specific number of the first limiting protrusion ring 111 can be determined comprehensively based on the size of the lining column 11 and the actual product model. In this embodiment, it is two levels arranged in sequence from the inside to the outside.

[0022] The second end limit assembly 2 includes at least a limit head 21 that is detachably mounted on the other end of the liner column 11; the detachable method may be conventional, such as a threaded rod 23 that is threadedly connected to the limit head 21 and matches the liner column 11 (that is, a threaded hole extending inward and matching the threaded rod 23 is provided on the end face of the liner column 11, so that the limit head 21 is connected to the liner column 11 by the threaded rod 23). At the same time, an adjusting nut 24 located on the outside of the limit head 21 is installed on the threaded rod 23. By rotating the adjusting nut 24, not only can the distance between the limit head 21 and the limit plate 12 be slightly adjusted, but also the clamping strength of the special-shaped steel pipe processing fixture on the steel pipe can be adjusted. The circumferential surface of the limiting head 21 is formed with at least one second limiting protrusion 22 that cooperates with the limiting protrusion 111. The number of the second limiting protrusion 22 is the same as the number of the aforementioned first limiting protrusion 111. In this way, the end face of the steel pipe is limited and clamped by cooperating with the second limiting protrusion 22 and the first limiting protrusion 111.

[0023] In this embodiment, a plurality of planes 112 are provided on the circumference of the first limiting protrusion 111 at intervals. This can reduce the contact area between the first limiting protrusion 111 and the steel pipe fitting, thereby avoiding excessive friction between the first limiting protrusion 111 and the steel pipe fitting, which would cause difficulties in loading and replacement. A first avoidance groove 113 is provided on the circumference of the liner column 11, extending to the limiting protrusion 111. The end face of the limiting protrusion 111 (the end face facing the second end limiting assembly 2) is formed with a first auxiliary limiting block 1111 extending into the first avoidance groove 113. This facilitates the feed of the machining tool to form the outline of the notch groove 11', and cooperates with the limiting protrusion 111 to ensure that the friction between them and the steel pipe fitting is at a reasonable level.

[0024] In this embodiment, at least one avoidance circular groove 114 is provided on the circumference of the liner column 11 for correspondingly realizing the processing of the aforementioned circular hole 12'. Similarly, a second avoidance groove 115 extending toward the second end limit assembly 2 is also provided on the circumference of the liner column 11 (at the end near the second end limit assembly 2), and a plurality of avoidance grooves 25 corresponding to the second avoidance groove 115 are provided on the circumference of the limit head 21. The avoidance grooves 25 extend outward to pass through the second limit convex ring 22, thereby forming the outline of another notch groove 11' to ensure that the friction between them and the steel pipe fittings is at a reasonable level.

[0025] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A special-shaped steel pipe processing fixture, characterized in that: It includes: A first end limit assembly (1), the first end limit assembly (1) comprising a first end face limit plate (12) and an inner liner column (11); a steel pipe limit protrusion (121) is formed at the center of the end face of the first end face limit plate (12); the inner liner column (11) is formed at the center of the end face of the steel pipe limit protrusion (121); at least one first-level limit protrusion ring (111) is formed at the end of the inner liner column (11) connected to the steel pipe limit protrusion (121); A second end limit assembly (2), the second end limit assembly (2) at least comprises a limit head (21) detachably mounted on the other end of the lining column (11), the circumferential surface of the limit head (21) being formed with at least one second limit convex ring (22) that cooperates with the limit convex ring (111).

2. The special-shaped steel pipe processing fixture according to claim 1, characterized in that: The first end surface limiting plate (12) is provided with a plurality of mounting holes (122) surrounding the steel pipe limiting protrusion (121).

3. The special-shaped steel pipe processing fixture according to claim 1, characterized in that: A plurality of planes (112) arranged at intervals are formed on the circumferential surface of the first limiting convex ring (111).

4. The special-shaped steel pipe processing fixture according to claim 1, characterized in that: A first avoidance groove (113) extending to the limiting convex ring (111) is provided on the circumferential surface of the lining column (11), and a first auxiliary limiting block (1111) extending into the first avoidance groove (113) is formed on the end surface of the limiting convex ring (111).

5. The special-shaped steel pipe processing fixture according to claim 1 or 4, characterized in that: At least one avoidance circular groove (114) is provided on the circumferential surface of the lining column (11).

6. The special-shaped steel pipe processing fixture according to claim 1 or 4, characterized in that: A second avoidance groove (115) extending toward the second end limit assembly (2) is also provided on the circumferential surface of the lining column (11), and a second auxiliary limit block (1151) is provided in the second avoidance groove (115).

7. The special-shaped steel pipe processing fixture according to claim 6, characterized in that: The limiting head (21) is internally threadedly connected to a threaded rod (23) that matches the lining column (11), and an adjusting nut (24) located outside the limiting head (21) is installed on the threaded rod (23).

8. The special-shaped steel pipe processing fixture according to claim 7, characterized in that: A plurality of avoidance grooves (25) corresponding to the second avoidance grooves (115) are provided on the circumferential surface of the limiting head (21), and the avoidance grooves (25) extend outwards to pass through the second limiting convex ring (22).

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