Fusion welding machine for soluble polytetrafluoroethylene tube plate

Abstract

The utility model provides a fusion welding machine for a soluble polytetrafluoroethylene tube plate, and belongs to the technical field of welding. The problem that existing PFA welding equipment is not suitable for tube plate welding is solved. The fusion welding machine comprises an operation table, a sliding support, a fixing frame, a top column assembly, a lower die disc, a material pressing disc, a hanging frame, a hot air gun, an upper die assembly, a heat source outer sleeve and a heat source core sleeve, a lower guide rail is arranged on the operation table, the sliding support is slidably connected with the lower guide rail, an upper sliding rail is arranged below a cross beam of the sliding support, and the fixing frame is slidably connected with the upper sliding rail. A first motor is arranged on the fixing frame, the output end of the first motor is connected with a first lead screw, the first lead screw is connected with a hanging bracket, a second motor is arranged on the hanging bracket, the second motor is connected with a second lead screw, the second lead screw is in threaded connection with the hanging bracket, the lower end of the second lead screw is connected with the upper die assembly, and the hot air gun and the heat source jacket are both connected with the hanging bracket. The fusion welding device is mainly used for fusion welding of soluble polytetrafluoroethylene tube plates.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of welding technology, especially relates to a fusion welding machine for soluble polytetrafluoroethylene pipe plate. BACKGROUND

[0002] The pipe plate is one of the core components of the glass tube heat exchanger, and is used for fixing the glass tube on both sides. The pipe plate is required to have certain supporting force, high temperature resistance and corrosion resistance in the process gas, and needs to be tightly matched with the glass tube. The pipe plate is welded by a porous plate and a tube, and is made of soluble polytetrafluoroethylene (PFA). The pipe plate is required to be firmly welded, have good sealing performance, and have small size deviation after welding. There are two types of conventional PFA welding equipment: hot fusion welding equipment and hot pressure welding equipment.

[0003] The hot fusion welding equipment uses a heat source to heat the PTFE plate to the melting point to form a molten pool, and then different fillers are added to the molten pool for welding. This welding method is suitable for thicker PTFE plates and has higher welding strength, but it requires fillers, and the welding process is complex and the cost is high.

[0004] The hot pressure welding equipment uses the double action of heating and pressure to make the molecules of the plates penetrate and diffuse each other, thereby realizing welding. The hot pressure welding has the advantages of high welding strength and good sealing performance, and does not require filler materials during the welding process, but requires a relatively high welding equipment.

[0005] The PFA pipe plate is welded by a porous plate and a tube, and the tube perpendicular to the porous plate is welded in the inner hole of the porous plate. The outer wall of the tube is welded with the inner hole of the porous plate. The conventional welding equipment is mainly suitable for butt welding or lap welding of "plate and plate" or "tube and tube". Due to the special structure of the PFA pipe plate, the conventional welding equipment is not suitable for welding the pipe plate. The structure and process of the equipment cannot well control the temperature, pressure and cooling time and other parameters, resulting in poor welding, poor sealing performance or large size deviation after welding, etc. quality problems, thereby affecting the service life of the glass tube heat exchanger, and in severe cases, it will cause the equipment to stop running, causing a large loss. INVENTION CONTENTS

[0006] Therefore, the utility model aims at providing a fusion welding machine for soluble polytetrafluoroethylene pipe plate to solve the problem that the existing PFA welding equipment is not suitable for pipe plate welding.

[0007] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of fusion welding machine for soluble polytetrafluoroethylene pipe plate, it includes operation platform, sliding support, fixed frame, top column assembly, lower die disc, pressure disc, hanger, hot air gun, upper die assembly, heat source outer cover and heat source core cover, the lower guide rail is provided on the operation platform, the sliding support is slidably connected with lower guide rail, the crossbeam of sliding support is provided with upper slide rail below, the fixed frame is slidably connected with upper slide rail, the fixed frame is provided with first motor, the output of first motor is connected with first lead screw, the first lead screw is connected with hanger, the second motor is provided on the hanger, the second motor is connected with second lead screw, the second lead screw is threadedly connected with hanger, the second lead screw lower end is connected with upper die assembly, the hot air gun and heat source outer cover are connected with hanger, the air inlet is formed in heat source outer cover, the air outlet of hot air gun is connected with the air inlet of heat source outer cover, the heat source core cover is arranged between upper die assembly and heat source outer cover, the heat source core cover is connected with pressure rod, the pressure rod is connected with first cylinder, the lower portion of heat source outer cover and heat source core cover is conical structure, the gap of the lower portion of heat source outer cover and heat source core cover is hot air outlet, the pressure disc is arranged at the lower end of hanger, the lower die disc is arranged on operation platform, a plurality of die holes are formed in the lower die disc, a plurality of jacks are arranged on the top column assembly, the plurality of jacks and the plurality of die holes are one-to-one corresponding, the second cylinder is connected with the lower portion of top column assembly.

[0008] Further, cooling channels are arranged on the pressure disc and the lower die disc, and cooling water is introduced into the cooling channels.

[0009] Further, the pressure disc includes a pressure plate and a plurality of pressure columns, and the pressure plate is connected with the hanger.

[0010] Further, a spiral flow guide protrusion is arranged on the outside of the heat source core cover.

[0011] Further, the bottom end of the upper die assembly is a circular arc conical surface structure.

[0012] Further, the hanger is slidably connected with the fixed frame.

[0013] Further, the second motor is connected with the second lead screw through a transmission mechanism.

[0014] Further, the number of pressure rods is two, and the two pressure rods are connected with the heat source core cover and the first cylinder respectively.

[0015] Further, the top rod is connected with the second cylinder.

[0016] Further, the number of die holes is 72.

[0017] The utility model also provides a kind of using method for the fusion welding machine of soluble polytetrafluoroethylene tube plate, it includes the following steps:

[0018] Step 1: start the second cylinder, push the jackscrew assembly upwards, make the jackscrew enter the mold hole of lower die disc, put PFA tube in all mold holes, according to the position, place PFA porous plate on lower die disc, compact PFA porous plate by pressure disc, jackscrew assembly pushes upwards, PFA tube is pushed upwards to the height required by fusion welding;

[0019] Step 2: adjust the position of hanger, start hot air gun, hot air heats heating part through hot air outlet, locally heat PFA tube and PFA porous plate to fusion welding temperature, when starting to appear melting state, start the second motor to drive upper die assembly to move downwards, exert vertical pressure on melting part, rotate in tangential direction simultaneously, realize spinning fusion welding, after fusion welding part cools to set temperature, complete the fusion welding of one PFA tube and PFA porous plate;

[0020] Step 3: after repeating step 2 to complete the fusion welding of all PFA tubes and PFA porous plates, start the first motor to separate pressure disc and PFA porous plate, start the second cylinder, push tube plate as a whole out of lower die disc by jackscrew assembly, complete the fusion welding of tube plate.

[0021] Compared with prior art, the utility model has the advantages that the utility model provides a kind of fusion welding machine for soluble polytetrafluoroethylene tube plate, adopts spinning fusion welding mode, by controlling the temperature, pressure and cooling time etc.

[0022] In the process of realizing welded tube plate, the utility model adopts spinning mode to carry out fusion welding, effectively prevents the welding deformation of tube plate by structural constraint, reduces welding size deviation;By adjusting heat flow and welding time, cooling time ensures the strength and sealing property of welding, and the whole machine can be controlled intelligently, only PFA tube and PFA porous plate need to be placed manually, and other all welding work is completed automatically, one cycle can complete the welding of 72 tubes, improves the welding efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings that constitute part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model.In the drawings:

[0024] Figure 1A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0025] Figure 2 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model. Figure 1 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0026] Figure 3 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model. Figure 2 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0027] Figure 4 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model. Figure 3 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0028] Figure 5 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0029] Figure 6 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0030] Figure 7 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0031] Figure 8 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0032] Figure 9 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0033] Figure 10 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0034] Figure 11 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0035] Figure 12 A partial cross-section structure schematic view of a melting welding machine for the soluble polytetrafluoroethylene pipe plate is described in the utility model.

[0036] In the drawing:

[0037] 1-Operation platform, 2- Lower guide rail, 3- Sliding support, 4- First motor, 5- Fixed frame, 6- First screw, 7- Transmission mechanism, 8- Second motor, 9- Second cylinder, 10- Top rod, 11- Top column assembly, 12- Lower die disc, 13- Pressing disc, 14- First cylinder, 15- Suspension frame, 16- Upper slide rail, 17- Hot air gun, 18- Second screw, 19- Upper die assembly, 20- Heat source outer sleeve, 21- Heat source core sleeve, 22- Pressing rod, 23- Die hole, 24- Cooling channel, 25- Pressing plate, 26- Pressing column, 27- Circular arc conical surface, 28- Spiral flow guide protrusion. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0039] Reference Figures 1-12 In order to illustrate the present embodiment, a kind of fusion welding machine for soluble polytetrafluoroethylene tube plate, it includes operation platform 1, sliding support 3, fixed frame 5, top column assembly 11, lower die disc 12, pressing disc 13, suspension frame 15, hot air gun 17, upper die assembly 19, heat source outer sleeve 20 and heat source core sleeve 21.

[0040] The operation platform 1 is provided with lower guide rail 2, the sliding support 3 is slidably connected with lower guide rail 2, the crossbeam of sliding support 3 is provided with upper slide rail 16, and the fixed frame 5 is slidably connected with upper slide rail 16, so that the horizontal position of fixed frame 5 on operation platform 1 can be moved by the cooperation of lower guide rail 2 and upper slide rail 16.

[0041] The fixed frame 5 is provided with first motor 4, the output end of first motor 4 is connected with first screw 6, first screw 6 is connected with suspension frame 15, and first screw 6 is rotated by the rotation of first motor 4, so as to drive suspension frame 15 to vertically move up and down along vertical direction.

[0042] The suspension frame 15 is provided with second motor 8, second motor 8 is connected with second screw 18, second screw 18 is threadedly connected with suspension frame 15, and the lower end of second screw 18 is connected with upper die assembly 19, so as to drive second screw 18 to rotate by second motor 8, so as to drive upper die assembly 19 to rotate and vertically move up and down along vertical direction.

[0043] The hot air gun 17 and the heat source jacket 20 are both connected to the hanger 15. The heat source jacket 20 has an air inlet. The air outlet of the hot air gun 17 is connected to the air inlet of the heat source jacket 20. The heat source core sleeve 21 is disposed between the upper mold assembly 19 and the heat source jacket 20. The heat source core sleeve 21 is connected to the pressure rod 22. The pressure rod 22 is connected to the first cylinder 14. The lower parts of the heat source jacket 20 and the heat source core sleeve 21 are both conical structures. The gap at the lower part of the heat source jacket 20 and the heat source core sleeve 21 is the hot air outlet. The heat source core sleeve 21 is located inside the heat source outer sleeve 20, and the upper mold assembly 19 is located inside the heat source core sleeve 21. Hot air generated by the hot air gun 17 enters between the heat source outer sleeve 20 and the heat source core sleeve 21 through the air inlet of the heat source outer sleeve 20. When the first cylinder 14 is activated, the first cylinder 14 drives the pressure rod 22 to move up and down, thereby driving the heat source core sleeve 21 to move vertically up and down. The vertical movement of the heat source core sleeve 21 changes the opening and closing size of the gap between the heat source outer sleeve 20 and the lower part of the heat source core sleeve 21, thereby changing the hot air density. The pressure plate 13 is located at the lower end of the hanger 15 and moves together with the hanger 15.

[0044] The lower mold plate 12 is mounted on the operating table 1. The lower mold plate 12 has several mold holes 23. The top column assembly 11 has several top columns, each corresponding to one of the mold holes 23. The top column assembly 11 is connected to a second cylinder 9 at its lower part. When the second cylinder 9 is activated, it drives the top column assembly 11 to move up and down, causing the top columns to move up and down within the mold holes 23 of the lower mold plate 12.

[0045] In this embodiment, both the pressure plate 13 and the lower mold plate 12 are provided with cooling channels 24, and cooling water flows through the cooling channels 24. The cooling water cools the pressure plate 13 and the lower mold plate 12, thereby cooling the fusion welding area.

[0046] The pressure plate 13 in this embodiment includes a pressure plate 25 and pressure columns 26. The pressure plate 25 is connected to the hanger 15, and there are multiple pressure columns 26 arranged below the pressure plate 25. The multiple pressure columns 26 press the PFA perforated plate firmly, ensuring uniform pressure.

[0047] In this embodiment, a spiral guide protrusion 28 is provided on the outer side of the heat source core sleeve 21. The spiral guide protrusion 28 guides the hot air, causing the hot air to rotate and heat the heating part, thus achieving the effect of heat concentration.

[0048] In this embodiment, the bottom of the upper mold assembly 19 has a circular arc conical surface 27 structure. The circular arc conical surface 27 can provide angular guidance for the welding area, ensuring welding accuracy. The hanger 15 is slidably connected to the fixed frame 5, and the fixed frame 5 guides the vertical movement of the hanger 15.

[0049] Preferably, the second motor 8 is connected to the second lead screw 18 via a transmission mechanism 7. There are two pressure rods 22, each connected to the heat source core sleeve 21 and the first cylinder 14 respectively. The lower part of the top column assembly 11 is connected to the top rod 10, which is connected to the second cylinder 9. This ensures a stable connection. There are 72 die holes 23, allowing for the insertion of 72 PFA tubes at a time.

[0050] This embodiment describes a method for using a fusion welding machine for soluble polytetrafluoroethylene (PTFE) tubing sheets, which includes the following steps:

[0051] Step 1: Activate the second cylinder 9 to push the top column assembly 11 upward, so that the top column enters the mold hole 23 of the lower mold plate 12 and reaches the specified height. Place PFA tubes into all mold holes 23, up to 72 tubes at a time. Place the PFA perforated plate on the lower mold plate 12 according to the position, and press the PFA perforated plate with the pressure plate 13. Push the top column assembly 11 upward to push the PFA tubes upward to the height required for welding.

[0052] Step 2: Adjust the position of the hanger 15, start the hot air gun 17, the hot air rotates under the action of the spiral guide protrusion 28, and then heats the heating part through the hot air outlet. Start the first cylinder 14, adjust the opening and closing size of the gap between the heat source core sleeve 21 and the lower part of the heat source outer sleeve 20 to ensure sufficient hot air density, and locally heat the PFA tube and PFA porous plate to the welding temperature. When the melting state begins to appear, start the second motor 8 to drive the upper mold assembly 19 to move downward, apply vertical pressure to the melting part, and rotate in the tangential direction to achieve spin welding. Then, water cool the pressure plate 13 and the lower mold plate 12 to cool the welding part to the set temperature, and complete the welding of a PFA tube and a PFA porous plate.

[0053] Step 3: After completing the welding of all PFA tubes and PFA perforated plates by repeating step 2, start the first motor 4 to separate the pressure plate 13 from the PFA perforated plate, start the second cylinder 9, and push the tube sheet out of the lower mold plate 12 through the top column assembly 11 to complete the welding of the tube sheet.

[0054] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. A welding machine for soluble polytetrafluoroethylene (PTFE) tube sheets, characterized in that: It includes an operating table (1), a sliding bracket (3), a fixed frame (5), a top column assembly (11), a lower mold plate (12), a pressure plate (13), a hanger (15), a hot air gun (17), an upper mold assembly (19), a heat source jacket (20), and a heat source core sleeve (21). The operating table (1) is provided with a lower guide rail (2), and the sliding bracket (3) is slidably connected to the lower guide rail (2). An upper slide rail (16) is provided below the crossbeam of the sliding bracket (3). The fixed frame (5) The upper slide rail (16) is slidably connected to the fixed frame (5). A first motor (4) is provided on the fixed frame (5). The output end of the first motor (4) is connected to the first lead screw (6). The first lead screw (6) is connected to the hanger (15). A second motor (8) is provided on the hanger (15). The second motor (8) is connected to the second lead screw (18). The second lead screw (18) is threadedly connected to the hanger (15). The lower end of the second lead screw (18) is connected to the upper mold assembly (19). The heat... Both the hot air gun (17) and the heat source jacket (20) are connected to the hanger (15). The heat source jacket (20) has an air inlet. The air outlet of the hot air gun (17) is connected to the air inlet of the heat source jacket (20). The heat source core sleeve (21) is located between the upper mold assembly (19) and the heat source jacket (20). The heat source core sleeve (21) is connected to the pressure rod (22). The pressure rod (22) is connected to the first cylinder (14). The lower part of the heat source jacket (20) and the heat source core sleeve (21) All are conical structures. The lower gap between the heat source jacket (20) and the heat source core jacket (21) is the hot air outlet. The pressure plate (13) is set at the lower end of the hanger (15). The lower mold plate (12) is set on the operating table (1). The lower mold plate (12) has several mold holes (23). The top column assembly (11) has several top columns. The positions of the several top columns and the several mold holes (23) correspond one-to-one. The bottom of the top column assembly (11) is connected to the second cylinder (9).

2. The fusion welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: Cooling channels (24) are provided on both the pressing plate (13) and the lower mold plate (12), and cooling water is introduced into the cooling channels (24).

3. The fusion welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: The pressure plate (13) includes a pressure plate (25) and pressure columns (26). The pressure plate (25) is connected to the hanger (15). There are multiple pressure columns (26), which are arranged below the pressure plate (25).

4. The fusion welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: The heat source core sleeve (21) is provided with a spiral flow guiding protrusion (28) on the outside.

5. The welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: The bottom of the upper mold assembly (19) is a circular arc conical surface (27) structure.

6. The fusion welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: The hanger (15) is slidably connected to the fixed frame (5).

7. The welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: The second motor (8) is connected to the second lead screw (18) through the transmission mechanism (7).

8. The fusion welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: There are two pressure rods (22), and the two pressure rods (22) are respectively connected to the heat source core sleeve (21) and the first cylinder (14).

9. A welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: The top column assembly (11) is connected to the top rod (10) below, and the top rod (10) is connected to the second cylinder (9).

10. A welding machine for soluble polytetrafluoroethylene tube sheets according to claim 1, characterized in that: The number of the die holes (23) is 72.

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