Stainless steel pipe flanging machine

Abstract

A stainless steel pipe flanging machine comprises a flanging machine die holder, a pipe clamping piece, a flaring extrusion head, an end face extrusion head and a hydraulic device, a clamping piece fixing groove and an extrusion head moving groove are sequentially formed in the front middle section of the flanging machine die holder, and a piston mounting hole and an oil cylinder connecting hole are formed in the rear section of the flanging machine die holder; the pipe clamping piece is installed in the clamping piece fixing groove, a pipe clamping die cavity is formed in the middle of the pipe clamping piece in a penetrating mode, a flanging opening is formed in the tail end of the pipe clamping die cavity, and the stainless steel pipe is installed in the pipe clamping die cavity and extends to be flush with the end face, facing the side of the extrusion head moving groove, of the flanging opening. A flaring extrusion head or an end face extrusion head is arranged in the extrusion head movable groove, and the hydraulic device comprises a hydraulic oil cylinder, a piston connected to the front end of the hydraulic oil cylinder and a driving assembly pushing the piston to move. According to the flanging machine, the flanging effect of the flanging machine can be guaranteed; the device is simple in structure, few in parts, low in cost, small in occupied space, convenient to carry and suitable for the requirement of on-site temporary operation.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe processing, and more specifically to a flanging machine for stainless steel pipes. Background Art

[0002] Stainless steel pipes are hollow long steel materials, and are widely used as pipes for transporting fluids, such as oil, natural gas, water, gas, steam, etc. During the installation process, it is inevitable to connect stainless steel pipes. When connecting, usually the pipe orifices of two stainless steel pipes to be connected are first flanged, and then connectors such as clamps are used to connect the flanges.

[0003] The traditional flanging of stainless steel pipes is to manually use a hammer to hammer the edge of the pipe orifice of the stainless steel pipe outward to form a flange. This flanging method not only has a large labor intensity and low efficiency, but also has poor flanging quality, easily damages the structure of the pipe, and the flatness of the edge at the pipe orifice after flanging is poor, resulting in poor subsequent connection sealing performance.

[0004] To solve the above problems, a Chinese patent with the authorization announcement number of CN 211191557U discloses a flanging machine for thin-walled stainless steel pipes, which consists of a workbench, a drive box, a rotary drive mechanism, a pneumatic chuck, a guide rod, a sliding table, a flanging mechanism and a double-acting cylinder. The flanging mechanism consists of a mounting seat, a flanging head, a lead screw, a hand wheel, a mounting frame and a standard rod. The flanging head consists of a stop post and a flanging roller. When in use, the stainless steel pipe to be flanged is sleeved on the pneumatic chuck, and then driven by the double-acting cylinder to place the end of the steel pipe at the flanging roller of the flanging head. The side of the steel pipe is limited on the end face of the stop post. Subsequently, the motor is started, and the motor drives the pneumatic chuck to rotate, thereby driving the steel pipe to rotate. Under the extrusion of the flanging head, the flanging work is completed.

[0005] Although this patent can complete the automatic flanging work, it does not disclose the specific structure of the flanging roller that plays the flanging role, and its flanging effect is unknown. In addition, this flanging machine includes multiple power components and transmission parts such as a motor, a drive box, and a double-acting cylinder. The equipment occupies a large space, has a high cost, and is not easy to carry, and cannot be used for on-site temporary processing operations. Therefore, we provide a small and portable flanging machine for stainless steel pipes. Summary of the Utility Model

[0006] The utility model provides a flanging machine for stainless steel pipes to solve the problems that the flanging effect of the existing flanging machine cannot be guaranteed, the structure is complex, the equipment occupies a large space, the cost is high, it is not easy to carry, and it cannot be used for on-site temporary processing operations.

[0007] The utility model adopts the following technical solutions:

[0008] A stainless steel pipe flanging machine, comprising a flanging machine die base, pipe clamping pieces, a flaring extrusion head, an end face extrusion head and a hydraulic device. A clamping piece fixing groove and an extrusion head moving groove are successively formed in the middle front section of the flanging machine die base, and a piston mounting hole and an oil cylinder connection hole are formed in the rear section of the flanging machine die base. The pipe clamping pieces are installed in the clamping piece fixing groove, and a pipe clamping die cavity is formed through the middle of the pipe clamping pieces. A flanging port is formed at the end of the pipe clamping die cavity. A stainless steel pipe is installed in the pipe clamping die cavity and extends to align with the end face on the side of the flanging port facing the extrusion head moving groove. The flaring extrusion head or the end face extrusion head is installed in the extrusion head moving groove. A conical extrusion block is arranged at the front end of the flaring extrusion head facing the flanging port, and a 90° extrusion surface is arranged at the front end of the end face extrusion head facing the flanging port. The hydraulic device includes a hydraulic oil cylinder, a piston connected to the front end of the hydraulic oil cylinder, and a driving component for pushing the piston to move. The piston and the hydraulic oil cylinder are respectively installed in the piston mounting hole and the oil cylinder connection hole, and the driving component pushes the piston to move and abut against the back of the flaring extrusion head or the back of the end face extrusion head.

[0009] Preferably, the above-mentioned pipe clamping pieces are composed of a left movable clamping piece die and a right movable clamping piece die. The left movable clamping piece die is provided with a left pipe clamping die cavity, and the right movable clamping piece die is provided with a right pipe clamping die cavity. The left pipe clamping die cavity and the right pipe clamping die cavity are combined to form the pipe clamping die cavity.

[0010] Further, an annular limiting groove is arranged in the clamping piece fixing groove, and a semi-circular convex ring is respectively arranged on the outer surface of the left movable clamping piece die and the outer surface of the right movable clamping piece die. The two semi-circular convex rings are correspondingly clamped into the annular limiting groove.

[0011] Further, a dovetail groove is further formed on the inner side wall of the clamping piece fixing groove, and a die fixing dovetail key is installed in the dovetail groove.

[0012] Further, a radial threaded hole communicating with the dovetail groove is further arranged on the outer side wall of the clamping piece fixing groove, and a pressing screw is installed in the radial threaded hole.

[0013] Further, a return spring sleeved outside the piston is further installed in the piston mounting hole.

[0014] Preferably, the cone angle of the above-mentioned conical extrusion block is between 30° and 60°.

[0015] In a preferred embodiment, the above-mentioned driving component includes a portable hydraulic press and a hydraulic oil pipe. The hydraulic oil cylinder is provided with a hydraulic oil nozzle. The hydraulic oil nozzle is connected to one end of the hydraulic oil pipe through a hydraulic oil nozzle joint, and the other end of the hydraulic oil pipe is connected to the portable hydraulic press.

[0016] In another preferred embodiment, the above-mentioned driving assembly includes a movable rod, a fixed rod, a hydraulic chamber, a hydraulic column and a hydraulic fixing column. The hydraulic chamber is connected to the rear end of the hydraulic cylinder. The top of the hydraulic cylinder is provided with a hydraulic column and a hydraulic fixing column. One end of the movable rod is hinged to the hydraulic fixing column, and the inner side of the end of the movable rod is also connected to the hydraulic column through a connecting member to pull the hydraulic column up and down. The fixed rod is arranged below the movable rod and is connected to the hydraulic chamber.

[0017] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:

[0018] 1. For this stainless steel pipe flanging machine, with the flanging machine die base as the main body, a pipe clamping clip, a flaring extrusion head / end face extrusion head and a hydraulic device are sequentially installed in the flanging machine die base. First, the stainless steel pipe is fixedly installed on the pipe clamping clip, with its pipe orifice aligned with the side face of the flanging orifice. Then, the piston of the hydraulic device is used to push the flaring extrusion head to flare the stainless steel pipe orifice. Next, the end face extrusion head is used to perform a 90° flanging extrusion on the flared pipe, ensuring the flanging effect of the flanging machine. The flanging machine of this utility model has a simple structure and few components. Especially for the power driving assembly, it has a low cost, occupies a small volume, is convenient to carry, and meets the requirements of on-site temporary operations.

[0019] 2. On the outer surfaces of the left movable clip die and the right movable clip die of the present utility model, there is respectively provided a semi-circular convex ring, which is fitted into the annular limiting groove of the clip fixing groove, so as to position the pipe clamping clip in the circumferential direction. At the same time, a dovetail groove is opened on the inner side wall of the clip fixing groove. The dovetail groove key is installed and the pressing screw is tightened, so that the dovetail groove key presses one of the movable clip dies, ensuring that the pipe clamping clip tightly holds the stainless steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural view of Embodiment 1 of the present utility model.

[0021] Figure 2 It is a top view of the flanging machine die base of Embodiment 1 of the present utility model.

[0022] Figure 3 It is Figure 2 a cross-sectional view taken along the A-A direction in

[0023] Figure 4 It is a left view of a pipe clamping clip of the present utility model.

[0024] Figure 5 It is Figure 4 a cross-sectional view taken along the B-B direction in

[0025] Figure 6 It is a front view of the flaring extrusion head of Embodiment 1 of the present utility model.

[0026] Figure 7 This is the front view of the end face extrusion head of an embodiment of the present utility model.

[0027] Figure 8 This is the cross-sectional view of the installation of the flaring extrusion head of an embodiment of the present utility model.

[0028] Figure 9 This is the cross-sectional view of the installation of the end face extrusion head of an embodiment of the present utility model.

[0029] Figure 10 This is the structural schematic diagram of the second embodiment of the present utility model. Specific embodiments

[0030] The following describes the specific embodiments of the present utility model with reference to the accompanying drawings. To fully understand the present utility model, many details are described below. However, for those skilled in the art, the present utility model can be implemented without these details. For well-known components, methods, and processes, no further detailed description will be given below.

[0031] Embodiment 1

[0032] A stainless steel pipe flanging machine, referring to Figure 1 , includes a flanging machine die base 10, a pipe clamping clip 20, a flaring extrusion head 30, an end face extrusion head 40, and a hydraulic device. Referring to Figure 2 and Figure 3 , taking the direction from right to left in Figure 2 as the front-rear direction. In the middle and front section of the flanging machine die base 10, a clip fixing groove 11 and an extrusion head moving groove 12 are successively formed from right to left; in the rear section of the flanging machine die base 10, a piston installation hole 13 and an oil cylinder connection hole 14 are successively formed from right to left.

[0033] Referring to Figure 4 , Figure 5 and Figure 8 , the pipe clamping clip 20 is installed in the clip fixing groove 11. The pipe clamping clip 20 is composed of a left movable clip die 21 and a right movable clip die 22. The left movable clip die 21 is provided with a left pipe clamping die cavity 210, and the right movable clip die 22 is provided with a right pipe clamping die cavity 220. The left pipe clamping die cavity 210 and the right pipe clamping die cavity 220 are combined to form a pipe clamping die cavity. The end of the pipe clamping die cavity forms a flanging port 200. The stainless steel pipe is installed in the pipe clamping die cavity and extends to align with the end face on the side of the flanging port 200 facing the extrusion head moving groove 12.

[0034] Referring to Figures 3 to 5 , an annular limiting groove 110 is provided in the above-mentioned clip fixing groove 11. The outer surfaces of the left movable clip die 21 and the right movable clip die 22 are respectively provided with a semi-circular convex ring 211, and the two semi-circular convex rings 211 are correspondingly clamped into the annular limiting groove 110.

[0035] Refer to Figure 1 and Figure 2 On the inner side wall of the above-mentioned collet fixing groove 11, a dovetail groove 111 is further provided, and a die fixing dovetail key (not shown in the figure) is installed in the dovetail groove 111. On the outer side wall of the collet fixing groove 11, a radial threaded hole 112 communicating with the dovetail groove 111 is further provided, and a pressing screw 113 is installed in the radial threaded hole 112.

[0036] Refer to Figure 8 and Figure 9 In the above-mentioned extrusion head moving groove 12, a flaring extrusion head 30 or an end face extrusion head 40 is installed. Among them, in combination with Figure 6 , at the front end of the flaring extrusion head 30 facing the flanging opening, a conical extrusion block 31 is provided. The conical extrusion block 31 is in the shape of a frustum of a cone, with its smaller end facing the side of the flanging opening 200. The outer diameter of the smaller end is slightly smaller than the inner diameter of the port of the stainless steel pipe to be flanged, and the cone angle of the conical extrusion block is preferably between 30° and 60°. In combination with Figure 7 , at the front end of the above-mentioned end face extrusion head 40 facing the flanging opening, a 90° extrusion surface 41 is provided. The outer diameter of the 90° extrusion surface 41 is slightly larger than the outer diameter of the flanging to ensure the flanging quality after flaring. In the middle of the front end of the 90° extrusion surface, a circular boss 42 is formed. The outer diameter of the circular boss 42 is slightly smaller than the inner diameter of the pipe orifice of the stainless steel pipe to support the pipe orifice and prevent the pipe orifice from deforming during extrusion.

[0037] Refer to Figure 1 Figure 2 and Figure 8 , the above-mentioned hydraulic device includes a hydraulic cylinder 51, a piston 52 connected to the front end of the hydraulic cylinder 51, and a driving component for pushing the piston 52 to move. The piston 52 and the hydraulic cylinder 51 are respectively installed in the piston installation hole 13 and the cylinder connection hole 14. Among them, the hydraulic cylinder 51 is installed in the cylinder connection hole 14 by means of threaded connection. A return spring 521 sleeved outside the piston 52 is further installed in the piston installation hole 13 to reset the piston 52 when the hydraulic cylinder 51 returns oil.

[0038] Refer to Figure 1 , the driving component of this embodiment includes a portable hydraulic press 531 and a hydraulic oil pipe 532. The hydraulic cylinder 51 is provided with a hydraulic oil nozzle, and the hydraulic oil nozzle is connected to one end of the hydraulic oil pipe 532 through a hydraulic oil nozzle joint 511, and the other end of the hydraulic oil pipe 532 is connected to the portable hydraulic press 531. The driving component pushes the piston 52 to move and abut against the back surface of the flaring extrusion head 30 or the back surface of the end face extrusion head 40.

[0039] For the stainless steel pipe flanging machine of this embodiment, the operation method is as follows:

[0040] 1. Connect the hydraulic nozzles of the portable hydraulic press 531 and the hydraulic cylinder with the hydraulic tubing 532, and connect the power supply of the portable hydraulic press.

[0041] 2. Loosen the compression screw 113 and retract the die fixing dovetail key 112.

[0042] 3. Place the stainless steel pipe to be flanged into the pipe clamping die cavity formed by the left movable clamping die 21 and the right movable clamping die 22. The port of the stainless steel pipe 1 to be flanged is flush with the flanging port 200.

[0043] 4. Place the pipe clamping clip 20 clamping the stainless steel pipe 1 into the clip fixing groove 11, lock the compression screw 113 to squeeze the die fixing dovetail key 112, so that the pipe clamping clip 20 tightly holds the stainless steel pipe 1.

[0044] 5. Place the flaring extrusion head 30 correctly and flatly into the extrusion head movable groove 12, operate the forward switch of the portable hydraulic press 531, the piston 52 at the front end of the hydraulic cylinder 51 abuts against the back of the flaring extrusion head 30, and push the flaring extrusion head 30 to flare and extrude the port of the stainless steel pipe. After the extrusion is in place, operate the return switch of the portable hydraulic press, the hydraulic cylinder resets, and take out the flaring extrusion head 30.

[0045] 6. Place the end face extrusion head 40 correctly and flatly into the extrusion head movable groove 12, operate the forward switch of the portable hydraulic press 531, the piston 52 at the front end of the hydraulic cylinder 51 abuts against the back of the end face extrusion head 40, and push the end face extrusion head 40 to perform a 90° flanging extrusion on the flared stainless steel pipe. After the extrusion is in place, operate the return switch of the portable hydraulic press 531, the hydraulic cylinder 51 resets, and take out the end face extrusion head 40.

[0046] 7. Loosen the compression screw 113, take out the stainless steel pipe with the flanging completed, and check whether the flanging size meets the requirements.

[0047] 8. If the flanging size of the stainless steel pipe does not meet the flanging requirements, cut the non-compliant flanging part and then readjust the positions of the pipe clamping clip and the head of the stainless steel pipe until the flanging is qualified.

[0048] Embodiment 2

[0049] Refer to Figure 10The main difference between this embodiment and the first embodiment is that the driving assembly structure of the hydraulic device is different. The driving assembly of this embodiment includes a movable rod 541, a fixed rod 542, a hydraulic bin 543, a hydraulic column 544 and a hydraulic fixed column 545. The hydraulic bin 543 is connected to the rear end of the hydraulic oil cylinder 51. The top of the hydraulic oil cylinder 51 is provided with a hydraulic column 544 and a hydraulic fixed column 545. One end of the movable rod 541 is hinged to the hydraulic fixed column 545. The inner side of the end of the movable rod 541 is also connected to the hydraulic column 544 through a connecting piece to pull the hydraulic column 544 up and down. The fixed rod 542 is arranged below the movable rod 541 and is connected to the hydraulic bin 543.

[0050] The hydraulic device of this embodiment actually adopts the structure of the head of the existing manual hydraulic pliers to drive the movement of the piston, and its principle will not be described in detail again.

[0051] The stainless steel pipe flanging machine of this embodiment operates as follows:

[0052] 1. Loosen the clamping screw 113 and retract the die fixing dovetail key 112.

[0053] 3. Place the stainless steel pipe to be flanging into the pipe clamping mold cavity formed by the left movable clamping mold 21 and the right movable clamping mold 22, and the end of the stainless steel pipe 1 to be flanging is flush with the flanging opening 200.

[0054] 4. Place the tube clamping clip 20 that has clamped the stainless steel pipe 1 into the clip fixing groove 11, lock the clamping screw 113, squeeze the die to fix the dovetail key 112, so that the tube clamping clip 20 holds the stainless steel pipe 1 tightly.

[0055] 5. Place the flaring extrusion head 30 correctly and flatly into the extrusion head movable groove 12, tighten the hydraulic switch, smoothly operate the movable rod, make the piston 52 press against the back of the flaring extrusion head, push the flaring extrusion head 30 to flare and extrude the end of the stainless steel pipe, release the hydraulic switch after extrusion is in place, and take out the flaring extrusion head 30.

[0056] 6. Place the end face extrusion head 40 correctly and flatly into the extrusion head movable groove 12, tighten the hydraulic switch, and smoothly operate the movable rod 541 to make the piston press against the back of the end face extrusion head 40, and push the end face extrusion head 40 to perform 90° flanging extrusion on the expanded stainless steel pipe. After the extrusion is in place, release the hydraulic switch and take out the end face extrusion head 40.

[0057] 7. Loosen the tightening screw 113, take out the stainless steel pipe 1 that has been flanging, and check whether the flanging size meets the requirements.

[0058] 8. If the flange size of the stainless steel pipe does not meet the flanging requirements, cut off the flanging part that does not meet the requirements and readjust the position of the pipe clamp and the stainless steel pipe head until the flanging is qualified.

[0059] The above are only the specific embodiments of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantive modification made to the present utility model using this concept shall fall within the scope of infringement of the protection scope of the present utility model.

Claims

1. A stainless steel pipe flanging machine, characterized in that: It comprises a flanging machine die base, a tube clamping clip, an expanding extrusion head, an end face extrusion head and a hydraulic device. The middle front section of the flanging machine die base is provided with a clip fixing groove and an extrusion head movable groove in sequence, and the rear section of the flanging machine die base is provided with a piston mounting hole and a cylinder connecting hole; the tube clamping clip is installed in the clip fixing groove, a tube clamping die cavity is provided through the middle of the tube clamping clip, a flanging opening is formed at the end of the tube clamping die cavity, a stainless steel pipe is installed in the tube clamping die cavity, and extends to align with the end face of the flanging opening facing the extrusion head movable groove; The flaring extrusion head or the end face extrusion head is installed in the movable groove of the extrusion head, the front end of the flaring extrusion head facing the flanging opening is provided with a conical extrusion block, and the front end of the end face extrusion head facing the flanging opening is provided with a 90° extrusion surface; the hydraulic device includes a hydraulic cylinder, a piston connected to the front end of the hydraulic cylinder, and a driving component that pushes the piston to move, the piston and the hydraulic cylinder are respectively correspondingly installed in the piston mounting hole and the cylinder connecting hole, and the driving component pushes the piston to move against the back side of the flaring extrusion head or the back side of the end face extrusion head.

2. A stainless steel pipe flanging machine as claimed in claim 1, characterized in that: The tube clamping clip is composed of a left movable clip mold and a right movable clip mold. The left movable clip mold is provided with a left tube clamping mold cavity, and the right movable clip mold is provided with a right tube clamping mold cavity. The left tube clamping mold cavity and the right tube clamping mold cavity are combined to form the tube clamping mold cavity.

3. A stainless steel pipe flanging machine as claimed in claim 2, characterized in that: An annular limiting groove is arranged in the clip fixing groove, and a semicircular convex ring is respectively arranged on the outer surface of the left movable clip mold and the outer surface of the right movable clip mold, and the two semicircular convex rings are correspondingly inserted into the annular limiting groove.

4. A stainless steel pipe flanging machine as claimed in claim 2 or 3, characterized in that: A dovetail groove is also provided on the inner side wall of the clip fixing groove, and a die-casting fixed dovetail key is installed in the dovetail groove.

5. A stainless steel pipe flanging machine as claimed in claim 4, characterized in that: The outer side wall of the clip fixing groove is also provided with a radial threaded hole communicated with the dovetail groove, and a clamping screw is installed in the radial threaded hole.

6. A stainless steel pipe flanging machine as claimed in claim 1, characterized in that: A return spring sleeved on the outside of the piston is also arranged in the piston mounting hole.

7. A stainless steel pipe flanging machine as claimed in claim 1, characterized in that: The cone angle of the conical extrusion block is between 30° and 60°.

8. The stainless steel pipe flanging machine according to claim 1, characterized in that: The driving assembly includes a portable hydraulic press and a hydraulic oil pipe. The hydraulic oil cylinder is provided with a hydraulic oil nozzle. The hydraulic oil nozzle is connected to one end of the hydraulic oil pipe through a hydraulic oil nozzle joint. The other end of the hydraulic oil pipe is connected to the portable hydraulic press.

9. A stainless steel pipe flanging machine as claimed in claim 1, characterized in that: The driving assembly includes a movable rod, a fixed rod, a hydraulic bin, a hydraulic column and a hydraulic fixed column. The hydraulic bin is connected to the rear end of the hydraulic cylinder. A hydraulic column and a hydraulic fixed column are provided on the top of the hydraulic cylinder. One end of the movable rod is hinged to the hydraulic fixed column. The inner side of the end of the movable rod is also connected to the hydraulic column through a connecting piece to pull the hydraulic column up and down. The fixed rod is arranged below the movable rod and is connected to the hydraulic bin.

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