Device and method for fastening heating pipe and flange

Abstract

The present invention discloses a device and method for fastening a heating pipe to a flange in the field of electric heating pipes, comprising a fuselage, a rear base and a fixing block provided on the fuselage, the fixing block and the rear base being arranged opposite to each other, the two ends of the fixing block being respectively connected to a fixing column, the rear base being provided with a hydraulic oil cylinder, the end of the hydraulic oil cylinder being connected to a fastening tool, a baffle block being provided on a surface of the fixing column facing the rear base, the baffle block being located at one end on the inner side of the fuselage extending out of the fixing column, a placement block being provided just below the baffle blocks, the placement block being arranged on the fixing block and being eccentrically arranged with the fastening tool; by extrusion, the pipe hole on the flange can be contracted inwardly under the action of pressure, tightly covering and biting the heating pipe, avoiding the problem of loose welding, and the connection between the heating pipe and the flange being not easily corroded. The present invention is used for fixing a heating pipe to a flange.

Description

Technical Field

[0001] The invention relates to a heating pipe fastening device and a method thereof. Background Art

[0002] The prior art discloses a heating tube with publication number CN 205912274 U and publication date January 25, 2017. The heating tube comprises a titanium alloy tube body, a welded tube body, and a flange. A heating element is disposed within the titanium alloy tube body. The titanium alloy tube body comprises a necking section, a connecting section, and a heating section, which are sequentially connected. The outer diameter of the necking section is equal to the inner diameter of the welded tube body, while the outer diameter of the connecting section is larger than the inner diameter of the welded tube body. The necking section is inserted into the welded tube body, and the welded tube body is welded to the flange. This heating tube inserts the titanium alloy tube body into the welded tube body, then necks the welded tube body to secure it to the welded tube body. Finally, the welded tube body is welded to the flange. This heating tube ensures the mechanical properties of the titanium alloy tube body, improves the reliability of the connection between the titanium alloy tube body and the flange, and effectively prevents leakage. However, the use of welding to fix the heating tube and the flange has the problem of loose welding, and the welding joint is more easily corroded, causing the heating tube to separate from the flange, posing safety hazards such as leakage. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for fastening a heating pipe to a flange. By extrusion, the pipe hole on the flange can shrink inward under the action of pressure, tightly wrapping the heating pipe and biting it, avoiding the problem of loose welding, and the connection between the heating pipe and the flange is not easily corroded.

[0004] To achieve the above-mentioned purpose, the present invention provides a device for fastening a heating pipe to a flange, comprising a fuselage, a rear base and a fixed block provided on the fuselage, the fixed block and the rear base being arranged opposite to each other, the two ends of the fixed block being connected to a fixed column respectively, a hydraulic cylinder being provided on the rear base, the end of the hydraulic cylinder being connected to a fastening tool, a spacer block being provided on a surface of the fixed column facing the rear base, the spacer block being located at one end on the inner side of the fuselage extending out of the fixed column, a placement block being provided directly below the spacer blocks, the placement block being provided on the fixed block and being eccentrically arranged to the fastening tool.

[0005] Compared with the prior art, the beneficial effect of the present invention is that the end of the heating tube is inserted into the tube hole of the flange, the flange is placed close to the block, the front end of the heating tube is placed on the placement block, the hydraulic cylinder is started, and the fastening tool is driven to move toward the end of the heating tube, and finally the end of the heating tube is completely wrapped in the fastening tool, so that the end of the fastening tool can be close to the flange. At this time, the hydraulic cylinder continues to advance forward, and the fastening tool is extended into the flange, so that the outer periphery of the tube hole is forced to shrink inward, and finally the heating tube is bitten and fixed. By extrusion, the tube hole on the flange can shrink inward under the action of pressure, tightly covering the heating tube and biting it, avoiding the problem of loose welding, and the connection between the heating tube and the flange is not easily corroded. The present invention is used for fixing the heating tube and the flange.

[0006] As a further improvement of the present invention, the fastening tool includes a connecting cylinder, the front end of the connecting cylinder is provided with a hollow internal cone cutter head, the end of the cone cutter head is processed with a circular blade, and the end of the cone cutter head extends inward with an arc-shaped groove, so that when the hydraulic cylinder pushes the fastening tool to move to the end of the heating tube, the front end of the cone cutter head swallows the heating tube and continues to squeeze toward the flange under the drive of the hydraulic cylinder. The flange is between the fastening tool and the spacer block and cannot move under the huge pressure of the hydraulic cylinder. The inside of the head goes deep into the flange. Since the outer diameter of the front end of the frustum cutter head is smaller than the outer diameter of the rear end and the end of the frustum cutter head is a circular blade, the frustum cutter head can be more easily inserted into the flange. The front end of the frustum cutter head has an arc-shaped groove. After the frustum cutter head goes deep into the flange, the outer periphery of the pipe hole on the flange is squeezed into the inside of the frustum cutter head. Under the action of the extrusion force, it continuously shrinks inward along the arc-shaped groove, so that the inner wall of the pipe hole is forced to shrink inward and firmly bite the outer wall of the heating tube, so that the heating tube can finally be firmly fixed on the flange.

[0007] As a further improvement of the present invention, the end of the conical cutter head is provided with a wedge-shaped groove extending inward, so that after the conical cutter head penetrates into the flange, the outer periphery of the pipe hole on the flange is squeezed into the interior of the conical cutter head. Under the action of the extrusion force, the wedge-shaped groove continuously shrinks inward, so that the inner wall of the pipe hole is forced to shrink inward and firmly bite the outer wall of the heating tube, so that the heating tube can finally be firmly fixed on the flange.

[0008] As a further improvement of the present invention, a limit block is provided on the inner wall of the connection between the conical cutter head and the connecting cylinder, so that when the end of the heating tube touches the limit block, the conical cutter head cannot go deeper, thereby avoiding the flange being inserted too deep and causing the strength of the flange to be reduced.

[0009] As a further improvement of the present invention, a U-shaped groove is processed in the middle of the top of the placement block, and semi-arc grooves are processed on both sides of the U-shaped groove. This makes it convenient to place the tube body of the heating tube in the U-shaped groove, avoiding the heating tube from being unable to be straightened on the plane, and making the processing effect better.

[0010] As a further improvement of the present invention, the block blocks are arranged relative to each other at an angle, so that the gaps between the block blocks can form an approximate circular arc, which can better match the multiple heating tubes inserted on the flange, and can better play a role in straightening and preventing the heating tubes from deflecting. When the tightening tool is used to reinforce the heating tubes and the flange, there will be no deviation or shaking.

[0011] As a further improvement of the present invention, a bracket is connected between the lower parts of the fixed columns, a screw is provided on the part of the bracket extending out of the fuselage, an arc groove is provided on the top of the screw, and the arc groove is arranged opposite to the placement block, so that the rear end of the heating tube can be placed on the arc groove, and the height of the arc groove can be adjusted by the screw according to actual conditions, so that the heating tubes can be on the same horizontal line, which is more conducive to the processing of fastening the tool.

[0012] As a further improvement of the present invention, the block is connected to the rear machine base via a fixing rod. In this way, when the tightening tool squeezes the flange, the shaking of the block due to the force can be transferred to the rear machine base through the fixing rod, so that the block has almost no shaking, further improving the effect of the tightening process.

[0013] As a further improvement of the present invention, the fixed column and the rear machine base are fixedly connected via a reinforcing rod. In this way, after the fixed column is subjected to the extrusion pressure of the hydraulic cylinder, the extrusion pressure can be shared to the rear machine base through the reinforcing rod, and then shared to the fuselage, so that the fixed column can better withstand the extrusion pressure from the hydraulic cylinder, ensuring that the entire device will not shake during the tightening process.

[0014] To achieve the above object, the present invention also provides a method for fastening a heating pipe to a flange, the specific steps of which are as follows:

[0015] Step 1: Insert both ends of the heating pipe into the pipe holes on the flange and extend the ends;

[0016] Step 2: Place the flange with the heating tube inserted close to the spacer block, with the front end of the heating tube placed on the U-shaped groove and the semi-arc groove, and the rear end of the heating tube placed on the arc groove;

[0017] Step 3: Start the hydraulic cylinder so that the end of the hydraulic cylinder pushes the fastening tool toward the end of the heating pipe extending out of the flange;

[0018] Step 4: The frustum cutter head of the fastening tool wraps the end of the heating tube extending out of the flange and continues to squeeze the outer periphery of the tube hole on the flange under the drive of the hydraulic cylinder;

[0019] Step 5: When the cutter head of the fastening tool penetrates into the flange to the set depth, the hydraulic cylinder begins to retract and the cutter exits the flange;

[0020] Step 6: Rotate the flange so that the end of the next heating tube to be tightened is aligned with the frustum cutter head of the tightening tool;

[0021] Step 7: Repeat steps 3-6 until all the ends of the heating pipes on the same circumference of the flange are tightened.

[0022] In this way, by extrusion, the pipe hole on the flange can shrink inward under the action of pressure, tightly wrapping the heating pipe and biting it, avoiding the problem of loose welding, and the connection between the heating pipe and the flange is not easily corroded. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a top view of the present invention.

[0024] Figure 2 It is a side view of the present invention.

[0025] Figure 3 for Figure 2 AA view in the middle.

[0026] Figure 4 This is a schematic diagram of the structure of the fastening tool with arc-shaped grooves in the present invention.

[0027] Figure 5 It is a structural schematic diagram of the flange in the present invention.

[0028] Figure 6 This is a structural schematic diagram of the heating tube end just being inserted into the frustum cutter head in the present invention.

[0029] Figure 7 It is a structural schematic diagram of the frustum cutter head squeezed into the flange in the present invention.

[0030] Figure 8 It is a schematic structural diagram of the flange and heating tube after being extruded in the present invention.

[0031] Figure 9 It is a schematic structural diagram of the fastening tool with wedge-surface grooving in the present invention.

[0032] Among them, 1 fuselage, 2 rear base, 3 hydraulic cylinder, 4 reinforcing rod, 5 fastening tool, 6 spacer block, 7 fixed block, 8 fixed column, 9 bracket, 10 placement block, 11 arc groove, 12 fixed rod, 13 screw, 14 semi-arc groove, 15 U-shaped groove, 16 connecting cylinder, 17 limit block, 18 frustum cutter head, 19 flange, 20 pipe hole, 21 heating tube, 22 arc grooving, 23 wedge grooving. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings:

[0034] Example 1

[0035] like Figure 1-4 The device for fastening a heating pipe to a flange shown in the figure comprises a body 1, a rear base 2 and a fixing block 7 are provided on the body 1, the fixing block 7 and the rear base 2 are arranged opposite to each other, the two ends of the fixing block 7 are respectively connected to a fixing column 8, a hydraulic cylinder 3 is provided on the rear base 2, the end of the hydraulic cylinder 3 is connected to a fastening tool 5, a stopper block 6 is provided on the side opposite to the rear base 2, the stopper block 6 is located on one end of the inner side of the body 1 and extends out of the fixing column 8, a placement block 10 is provided just below the stopper blocks 6, the placement block 10 is arranged on the fixing block 7 and is eccentrically arranged with respect to the fastening tool 5; the fastening tool 5 comprises a connecting cylinder 16, the front end of the connecting cylinder 16 is provided with a hollow internal frustum cutter head 18, The end of the frustum cutter head 18 is processed with a circular blade, and the end of the frustum cutter head is extended inward with an arc-shaped groove 22; a limit block 17 is provided on the inner wall of the connection between the frustum cutter head 18 and the connecting cylinder 16; a U-shaped groove 15 is processed in the middle of the top of the placement block 10, and semi-arc grooves 14 are processed on both sides of the U-shaped groove 15; the block blocks 6 are arranged obliquely relative to each other; a bracket 9 is connected between the lower part of the fixing column 8, and a screw 13 is provided on the part of the bracket 9 extending out of the fuselage 1, and an arc groove 11 is provided on the top of the screw 13, and the arc groove 11 is arranged opposite to the placement block 10; the block block 6 is connected to the rear base 2 via a fixing rod 12; the fixing column 8 and the rear base 2 are fixedly connected via a reinforcing rod 4.

[0036] like Figure 5-8 A method for fastening a heating pipe to a flange is shown, and the specific steps are as follows:

[0037] Step 1: Insert both ends of the heating tube 21 into the tube holes 20 on the flange 19 and extend the ends;

[0038] Step 2: Place the flange 19 with the heating tube 21 inserted close to the block 6, with the front end of the heating tube 21 placed on the U-shaped groove 15 and the semi-arc groove 14, and the rear end of the heating tube 21 placed on the arc groove 11;

[0039] Step 3: Start the hydraulic cylinder 3 so that the end of the hydraulic cylinder 3 pushes the fastening tool 5 toward the end of the heating tube 21 extending out of the flange 19;

[0040] Step 4: The frustum cutter head 18 of the fastening tool 5 wraps around the end of the heating tube 21 extending out of the flange 19 and continues to squeeze the outer periphery of the tube hole 20 on the flange 19 driven by the hydraulic cylinder 3;

[0041] Step 5: When the truncated cone cutter head 18 of the fastening tool 5 penetrates into the flange 19 to a set depth, the hydraulic cylinder 3 begins to retract, and the truncated cone cutter exits the flange 19;

[0042] Step 6: Rotate the flange 19 so that the end of the next heating tube 21 to be tightened is aligned with the frustum cutter head 18 of the tightening tool 5;

[0043] Step 7: Repeat steps 3-6 until all the ends of the heating tubes 21 on the same circumference of the flange 19 are tightened.

[0044] In the present invention, the connecting cylinder 16 of the fastening tool 5 is connected to the hydraulic cylinder 3, and the corresponding fastening tool 5 can be replaced according to the heating tube 21 of different specifications and models. Generally, the heating tube 21 is arranged around the circumference on the flange 19, so the fastening tool 5 connected to the hydraulic cylinder 3 is eccentrically arranged between the placement block 10 so that it can be aligned with the heating tube 21 inserted on the flange 19 that needs to be fastened.

[0045] When working, now select the appropriate fastening tool 5 to tighten it with the end of the hydraulic cylinder 3, then insert the heating tube 21 into the pipe hole 20 on the flange 19 and the end of the heating tube 21 extends out of the flange 19, and then move the combination of the heating tube 21 and the flange 19 to the fuselage 1. The flange 19 is placed close to the two spacer blocks 6, and the front end of the heating tube 21 is placed on the U-shaped groove 15 and the semi-arc groove 14 on the placement block 10. The rear end of the heating tube 21 is placed on the arc groove 11 on the bracket 9; the combination of the flange 19 and the heating tube 21 The whole body rotates so that the end of the heating tube 21 to be tightened and the corresponding tube hole 20 are aligned with the frustum cutter head 18 of the fastening tool 5; after the position adjustment is completed, the hydraulic cylinder 3 is started to extend the end of the hydraulic cylinder 3, driving the fastening tool 5 to move toward the flange 19. Since the outer diameter of the end of the heating tube 21 is smaller than the inner diameter of the frustum cutter head 18, when the fastening tool 5 is driven by the hydraulic cylinder 3, the frustum cutter head 18 just swallows the end of the heating tube 21. During the whole process, the heating tube 21 is not subjected to force; when the front end of the frustum cutter head 18 is When the flange 19 contacts the outer periphery of the pipe hole 20 on the flange 19, the flange 19 receives the pressure of the frustum cutter head 18, and the flange 19 is backed by the two spacer blocks 6, so that the flange 19 is firmly pressed against the spacer blocks 6 and cannot move, and the spacer blocks 6 and the placement blocks 10 can play an anti-deflection role for the heating tube 21, preventing the heating tube 21 from deviating due to slight vibration in this process; as the pressure exerted by the hydraulic cylinder 3 on the fastening tool 5 is applied, the circular blade of the frustum cutter head 18 can gradually penetrate into the flange 19, and because the frustum cutter head 1 The inner diameter of the arc-shaped groove 22 of 8 is constantly getting smaller, so the outer periphery of the tube hole 20 on the flange 19 squeezed into the arc-shaped groove 22 of the frustum cutter head 18 is constantly shrinking inward, causing the inner wall of the tube hole 20 to shrink, thereby biting and fixing the heating tube 21; after the frustum cutter head 18 penetrates the set distance, the hydraulic cylinder 3 begins to retract, driving the fastening tool 5 to return to its original position, and then adjusts the overall position of the combination of the flange 19 and the heating tube 21 so that the end of the next heating tube 21 that needs to be clamped and fixed is facing the fastening tool 5 for the next round of processing.

[0046] Since there is often more than one circle of tube holes 20 on the flange 19, after the ends of the heating tubes 21 on the same circle are clamped and fixed, they are moved to another device. The position of the fastening tool 5 on the device corresponds to the second circle of tube holes 20. The above steps are repeated to clamp and fix the heating tubes 21 on the second circle, so that all the tube holes 20 on the flange 19 are clamped and fixed to the ends of the heating tubes 21.

[0047] The present invention uses extrusion to allow the tube hole 20 on the flange 19 to shrink inward under the action of pressure, tightly wrapping around the heating tube 21 and tightening it, thereby solving the problem of loose welding caused by welding. In addition, the connection between the heating tube 21 and the flange 19 is not easily corroded, which can greatly extend the service life of the heating tube 21 and avoid the risk of leakage caused by loosening of the heating tube 21 and the flange 19.

[0048] Example 2

[0049] like Figure 9 In the device for fastening a heating tube to a flange shown, a wedge-shaped groove 22 is extended inward from the end of the frustum cutter head 18, and the other structures remain unchanged, and the technical effects of Example 1 can also be achieved.

[0050] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features therein according to the disclosed technical content without creative labor, and these substitutions and modifications are all within the protection scope of the present invention.

Claims

1. A device for fastening a heating pipe to a flange, characterized in that: The invention comprises a fuselage, wherein a rear base and a fixed block are provided on the fuselage, the fixed block and the rear base are arranged opposite to each other, the two ends of the fixed block are respectively connected to a fixed column, a hydraulic oil cylinder is provided on the rear base, the end of the hydraulic oil cylinder is connected to the fastening tool, a spacer block is provided on the side of the fixed column facing the rear base, one end of the spacer block is located on the inner side of the fuselage and extends out of the fixed column, a placement block is provided directly below the spacer block, the placement block is provided on the fixed block and is eccentrically arranged with respect to the fastening tool; The fastening tool comprises a connecting cylinder, the front end of which is provided with a hollow frustum cutter head, the end of which is processed with a circular blade, and the end of which is extended inwardly with an arc-shaped groove; The end of the frustum cutter head extends inwardly to have a wedge-shaped groove; A limit block is provided on the inner wall of the connection between the frustum cutter head and the connecting cylinder; A U-shaped groove is processed in the middle of the top of the placement block, and semi-arc grooves are processed on both sides of the U-shaped groove; The blocking blocks are arranged relative to each other with an inclination; A bracket is connected between the lower parts of the fixing columns, a screw is provided on the part of the bracket extending out of the fuselage, an arc groove is provided on the top of the screw, and the arc groove is arranged opposite to the placement block.

2. The device for fastening a heating pipe to a flange according to claim 1, characterized in that: The blocking block is connected to the rear machine base via a fixing rod.

3. The device for fastening a heating pipe to a flange according to claim 2, characterized in that: The fixing column and the rear machine base are fixedly connected via a reinforcing rod.

4. A method for fastening a heating pipe to a flange, characterized in that: The device for fastening a heating pipe to a flange according to any one of claims 1 to 3 comprises the following specific steps: Step 1: Insert both ends of the heating pipe into the pipe holes on the flange and extend the ends; Step 2: Place the flange with the heating tube inserted close to the spacer block, with the front end of the heating tube placed on the U-shaped groove and the semi-arc groove, and the rear end of the heating tube placed on the arc groove; Step 3: Start the hydraulic cylinder so that the end of the hydraulic cylinder pushes the fastening tool toward the end of the heating pipe extending out of the flange; Step 4: The frustum cutter head of the fastening tool wraps the end of the heating tube extending out of the flange and continues to squeeze the outer periphery of the tube hole on the flange under the drive of the hydraulic cylinder; Step 5: When the cutter head of the fastening tool penetrates into the flange to the set depth, the hydraulic cylinder begins to retract and the cutter exits the flange; Step 6: Rotate the flange so that the end of the next heating tube to be tightened is aligned with the frustum cutter head of the tightening tool; Step 7: Repeat steps 3-6 until all the ends of the heating pipes on the same circumference of the flange are tightened.

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