Plastic tube sealing equipment and sealing process thereof

Abstract

The invention provides plastic pipe sealing equipment and a sealing process thereof, and relates to the technical field of plastic pipe machining, the plastic pipe sealing equipment comprises a rack, a high-frequency generator and a refrigerator, two oppositely arranged refrigeration blocks are arranged on the rack, at least one refrigeration block is slidably mounted on the rack, the exteriors of the two refrigeration blocks are electrically connected with the high-frequency generator, and the high-frequency generator is electrically connected with the refrigerator. A plastic heat sealing welding face used for conducting low-temperature sealing on the plastic pipe is arranged on the opposite surfaces of the two refrigeration blocks respectively, a cooling cavity is formed in each refrigeration block, and the two cooling cavities communicate with the refrigerator. And a section of seal is formed on the plastic pipe after pressing, so that the plastic pipe is fully sealed, and the outer wall surface cannot reach the temperature required by melting through of the pipe wall by cooling the outer wall surface, and the melting through condition of the pipe wall is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic pipe processing, and in particular to a plastic pipe sealing device and a sealing process thereof. Background Art

[0002] After the plastic tube is processed and formed, it needs to be inflated and sealed at both ends. After inflation and sealing, it can be coiled. The current existing technology uses a conical heating rod to heat, melt and seal the plastic tube. However, when sealing the plastic tube, there is a situation where the tube wall is melted through or the tube wall is insufficiently melted, resulting in a loose seal at the seal of the plastic tube and slow air release. The stacked plastic tubes in rolls are pressurized and slowly leak, and the tube wall collapses, which makes the stacked plastic tubes at risk of collapse. The collapsed and leaking coiled plastic tubes cannot be sold.

[0003] Therefore, a plastic tube sealing device and a sealing process thereof are needed to solve the above problems. Summary of the Invention

[0004] The present invention provides a plastic tube sealing device and a sealing process thereof, which simultaneously melt the inner wall surface and cool the outer wall surface of the plastic tube, and form a seal on the plastic tube after pressing. This not only realizes the inflation seal of the plastic tube, but also cools the outer wall surface to quickly cool the plastic tube, thereby avoiding the plastic tube being unable to cool down in time due to high temperature, which affects the production coil speed.

[0005] The technical solution of the present invention is achieved as follows: The plastic tube sealing device includes a frame, a high-frequency generator and a refrigerator. The frame is provided with two refrigeration blocks arranged opposite to each other, at least one of the refrigeration blocks is slidably mounted on the frame, the exteriors of the two refrigeration blocks are respectively electrically connected to the high-frequency generator, and the opposing surfaces of the two refrigeration blocks are respectively provided with a plastic heat-sealing welding surface for low-temperature sealing of plastic tubes. A cooling cavity is provided inside each of the two refrigeration blocks, and both cooling cavities are connected to the refrigerator.

[0006] As a preferred technical solution, the cooling cavity is a cooling circulation channel, and the cooling circulation channel is arranged in a serpentine shape.

[0007] As a preferred technical solution, the refrigerator is an industrial chiller, and both ends of each cooling circulation channel are connected to the water inlet and return port of the industrial chiller through a water pipe.

[0008] As a preferred technical solution, multiple pressing ridges are provided on both plastic heat-sealing welding surfaces.

[0009] As a preferred technical solution, one of the refrigeration blocks is slidably mounted on the rack via a horizontal adjustment rack.

[0010] As a preferred technical solution, the other refrigeration block is fixedly mounted on the rack via at least one insulating block.

[0011] As a preferred technical solution, the horizontal adjustment frame includes a connecting plate and a mounting plate arranged horizontally from top to bottom, a plurality of adjusting bolts are provided between the connecting plate and the mounting plate, and the refrigeration block is fixedly mounted on the mounting plate.

[0012] As a preferred technical solution, an inflation tube is fixedly mounted on the frame, and the inflation tube is conical and connected to an air source.

[0013] The plastic tube sealing process specifically includes the following steps: S1. Placing the plastic tube: placing one end of the plastic tube between two plastic heat-sealed welding surfaces; S2. Sealing the inner wall of the plastic tube: Two cooling blocks move relative to each other to clamp the plastic tube. Under the action of a high-frequency generator, a high-frequency electromagnetic field is generated between the two cooling blocks, causing intense collisions between molecules inside the plastic tube, generating high temperatures. The high temperatures melt the inner wall of the plastic tube. Under the pressure of the two plastic heat-sealed welding surfaces, the inner wall of the plastic tube is welded together to form a seal. S3. Cooling the outer wall of the plastic tube: While the inner wall of the plastic tube is being sealed, the industrial chiller delivers cooling water to the cooling circulation channel through a water pipe. The cooling water continuously cools the two refrigeration blocks. The two refrigeration blocks are in contact with the outer wall of the plastic tube, lowering the temperature of the outer wall of the plastic tube to below the temperature required for the tube wall to melt through, thereby achieving rapid cooling of the seal, so that the seal will not be broken by the gas flowing into the tube due to excessive high temperature, causing sealing failure; S4, inflation: After one end is sealed, the refrigeration block is reset, the plastic tube is removed, and the other end of the plastic tube is inserted into the inflation tube to inflate the plastic tube; S5. Low-temperature sealing of the other end: After the inflation is completed, steps S1, S2 and S3 are repeated in sequence to complete the low-temperature sealing of the other end of the plastic tube. The refrigeration block is reset to prepare for the next sealing.

[0014] By adopting the above technical solution, the beneficial effects of the present invention are: Since the plastic tube sealing equipment includes two refrigeration blocks provided with cooling chambers, when using this equipment, the high-frequency electromagnetic field between the two refrigeration blocks causes the molecules inside the plastic tube to collide violently with each other to generate high temperature, and the high temperature causes the inner wall of the plastic tube to melt. Under the pressure of the two plastic heat-sealed welding surfaces, the inner wall of the plastic tube is welded together, forming a fully sealed seal on the plastic tube. At the same time, the refrigeration blocks cool down the outer wall of the plastic tube so that the outer wall cannot reach the temperature required for the tube wall to melt through, thereby avoiding the occurrence of tube wall melting through, solving the problem that the seal of the plastic tube cannot be cooled quickly due to tube wall melting through or tube wall melting, so that this equipment can fully seal the plastic tube and cool it quickly to prevent leakage and bulging.

[0015] In the prior art, after the plastic tube is melted, it is compressed to form only a seal on the plastic tube. If the plastic tube is not fully melted and the stacked layers are under pressure, air leakage is very likely to occur. However, the present invention forms a seal on the plastic tube through the plastic heat-sealed welding surface, thereby increasing the sealing area and avoiding the occurrence of air leakage.

[0016] Since there are multiple pressing ridges on the plastic heat-sealed welding surface, the pressing ridges press out multiple sealing ports on the plastic tube, so that the end of the plastic tube is multi-sealed. Even if one of the seals fails, the other seals still have a sealing effect on the end of the plastic tube, thereby improving the sealing effect of the plastic tube seal and further avoiding the occurrence of air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 Left view of; Figure 3 Schematic diagram of the structure of one of the refrigeration blocks; Figure 4 is a schematic structural diagram of another refrigeration block; Figure 5 It is a structural diagram of the cooling circulation channel; Figure 6 This is a reference diagram of the status of the two refrigeration blocks when sealing; Figure 7 for Figure 6 Schematic cross-sectional view along the AA direction; Figure 8 This is the system structure diagram of the PLC controller.

[0019] Among them: 1. Frame; 2. High-frequency generator; 3. Refrigeration block; 4. Plastic pipe; 5. Plastic heat-sealed welding surface; 6. Cooling circulation channel; 7. Water pipe; 8. Pressed rib; 9. Manual adjustment knob; 10. PLC controller; 11. Level adjustment frame; 12. Insulation block; 13. Connecting plate; 14. Mounting plate; 15. Adjustment bolt; 16. Inflatable tube; 17. Cylinder; 18. Guide column. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] like Figures 1-8 As shown together, the plastic tube sealing equipment includes a frame 1, a high-frequency generator 2 and a refrigerator. Two relatively arranged refrigeration blocks 3 are provided on the frame 1, and at least one of the refrigeration blocks 3 is slidably mounted on the frame 1. The outsides of the two refrigeration blocks 3 are respectively electrically connected to the high-frequency generator 2. The opposite surfaces of the two refrigeration blocks 3 are respectively provided with a plastic heat-sealing welding surface 5 for low-temperature sealing of the plastic tube 4. A cooling cavity is provided inside the two refrigeration blocks 3, and the two cooling cavities are connected to the refrigerator. The two refrigeration blocks 3 are both made of copper or aluminum that can conduct high-frequency electromagnetic waves. The high-frequency generator 2 generates high-frequency electromagnetic waves and conducts them to the two refrigeration blocks 3, so that a high-frequency electromagnetic field exists on the two refrigeration blocks 3. The high-frequency generator 2 is commercially available, and the structure of the high-frequency generator 2 is not described in detail.

[0022] The cooling cavity is a cooling circulation channel 6, and the cooling circulation channel 6 is arranged in a serpentine shape.

[0023] The refrigerator is an industrial chiller. The two ends of each cooling circulation channel 6 are connected to the water inlet and return port of the industrial chiller through a water pipe 7. The chiller can be divided into an air-cooled chiller and a water-cooled chiller. The industrial chiller in the present invention adopts a CW3000 water-cooled chiller.

[0024] A plurality of pressing ridges 8 are provided on the two plastic heat-sealing welding surfaces 5 .

[0025] One of the refrigeration blocks 3 is slidably mounted on the rack 1 via a horizontal adjustment frame 11 .

[0026] Another refrigeration block 3 is fixedly mounted on the frame 1 by at least one insulating block 12. The insulating block 12 is made of insulating material. Multiple insulating blocks 12 can be provided. Multiple insulating blocks 12 shield the two ends and operating sides of the refrigeration block 3 to prevent the operator from accidentally touching the refrigeration block 3 during the sealing operation, thereby improving the safety of the sealing operation.

[0027] The horizontal adjustment frame 11 includes a connecting plate 13 and a mounting plate 14 arranged horizontally from top to bottom. A plurality of adjusting bolts 15 are provided between the connecting plate 13 and the mounting plate 14 , and the refrigeration block 3 is fixedly mounted on the mounting plate 14 .

[0028] In the present invention, two pairs of adjusting bolts 15 are provided, and a pair of adjusting bolts 15 are respectively provided on both sides of the connecting plate 13. The two adjusting bolts 15 are respectively provided at both ends of the connecting plate 13. Before sealing, the horizontality of the mounting plate 14 is adjusted by rotating the adjusting bolts 15. Since the refrigeration block 3 is fixed to the mounting plate 14, the refrigeration block 3 is ensured to be in a horizontal state, thereby ensuring that the sealing part of the plastic tube 4 is flat.

[0029] An air filling pipe 16 is fixedly mounted on the frame 1 . The air filling pipe 16 is tapered and connected to an air source.

[0030] A cylinder 17 is fixedly mounted on the frame 1 , a piston rod of the cylinder 17 is fixedly connected to the connecting plate 13 , and a pair of guide posts 18 are provided between the cylinder 17 and the frame 1 .

[0031] The high-frequency generator 2 is connected to an external industrial power supply. The high-frequency generator 2 is connected to a manual adjustment knob 9 for adjusting the current on the two refrigeration blocks 3. The manual adjustment knob 9 is rotatably mounted on the rack 1.

[0032] It also includes a PLC controller 10 fixedly mounted on the rack 1. The PLC controller 10 uses a single-chip microcomputer model HD64F36109HV of Renesas. The high-frequency generator 2, industrial chiller and cylinder 17 are all electrically connected to the PLC controller 10. The external industrial power supply and industrial chiller are not marked in the figure.

[0033] The plastic tube sealing process specifically includes the following steps: S1. Placing the plastic tube 4: placing one end of the plastic tube 4 between two plastic heat-sealed welding surfaces 5.

[0034] S2. Sealing the inner wall of the plastic tube: The two refrigeration blocks 3 move relative to each other to clamp the plastic tube 4. Under the action of the high-frequency generator 2, a high-frequency electromagnetic field is generated between the two refrigeration blocks 3, causing the molecules inside the plastic tube 4 to collide violently with each other to generate high temperature. The high temperature melts the inner wall of the plastic tube 4. Under the pressure of the two plastic heat-sealed welding surfaces 5, the inner wall of the plastic tube 4 is welded together to form a seal.

[0035] S3. Cooling the outer wall of the plastic tube: While sealing the inner wall of the plastic tube 4, the industrial chiller delivers cooling water to the cooling circulation channel 6 through the water pipe 7. The cooling water continuously cools the two refrigeration blocks 3. The two refrigeration blocks 3 are in contact with the outer wall of the plastic tube 4, and the temperature of the outer wall of the plastic tube 4 is reduced to below the temperature required for the tube wall to melt through, so as to quickly cool the seal and prevent the seal from being broken by the gas in the tube due to excessive high temperature, resulting in sealing failure.

[0036] S4, inflation: After completing the sealing of one end, the refrigeration block 3 is reset, the plastic tube 4 is removed, and the other end of the plastic tube 4 is inserted into the inflation tube 16 to inflate the plastic tube 4.

[0037] S5. Low-temperature sealing of the other end: After completing the inflation, repeat steps S1, S2 and S3 in sequence to complete the low-temperature sealing of the other end of the plastic tube 4. The refrigeration block 3 is reset to prepare for the next sealing.

[0038] In summary, the present invention simultaneously melts the inner wall and cools the outer wall of the plastic tube, and forms a seal on the plastic tube after pressing, which not only achieves full sealing of the plastic tube, but also cools the outer wall so that the outer wall cannot reach the temperature required for melting through the tube wall, thereby avoiding the occurrence of melting through the tube wall. The sealing part of the plastic tube is cooled rapidly, thereby improving production efficiency.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Plastic tube sealing equipment, characterized in that, The invention comprises a frame, a high-frequency generator and a refrigerator. The frame is provided with two refrigeration blocks arranged opposite to each other, at least one of the refrigeration blocks is slidably mounted on the frame, the exteriors of the two refrigeration blocks are respectively electrically connected to the high-frequency generator, and the opposing surfaces of the two refrigeration blocks are respectively provided with a plastic heat-sealing welding surface for low-temperature sealing of plastic tubes, and the interiors of the two refrigeration blocks are each provided with a cooling cavity, and both cooling cavities are connected to the refrigerator.

2. The plastic tube sealing device according to claim 1, characterized in that: The cooling cavity is a cooling circulation channel, and the cooling circulation channel is arranged in a serpentine shape.

3. The plastic tube sealing device according to claim 2, characterized in that: The refrigerator is an industrial chiller, and both ends of each cooling circulation channel are connected to the water inlet and return port of the industrial chiller through a water pipe.

4. The plastic tube sealing device according to claim 1, characterized in that: A plurality of pressing ridges are provided on the two plastic heat-sealing welding surfaces.

5. The plastic tube sealing device according to claim 1, characterized in that: One of the refrigeration blocks is slidably mounted on the rack via a horizontal adjustment frame.

6. The plastic tube sealing device according to claim 5, characterized in that: The other refrigeration block is fixedly mounted on the frame via at least one insulating block.

7. The plastic tube sealing device according to claim 5, characterized in that: The horizontal adjustment frame includes a connecting plate and a mounting plate which are horizontally arranged from top to bottom. A plurality of adjusting bolts are arranged between the connecting plate and the mounting plate. The refrigeration block is fixedly mounted on the mounting plate.

8. The plastic tube sealing device according to any one of claims 1 to 7, characterized in that: An inflation tube is fixedly mounted on the frame, and the inflation tube is conical and connected to an air source.

9. Plastic tube sealing process, characterized in that: The specific steps include: S1. Placing the plastic tube: placing one end of the plastic tube between two plastic heat-sealed welding surfaces; S2. Sealing the inner wall of the plastic tube: Two cooling blocks move relative to each other to clamp the plastic tube. Under the action of a high-frequency generator, a high-frequency electromagnetic field is generated between the two cooling blocks, causing intense collisions between molecules inside the plastic tube, generating high temperatures. The high temperatures melt the inner wall of the plastic tube. Under the pressure of the two plastic heat-sealed welding surfaces, the inner wall of the plastic tube is welded together to form a seal. S3. Cooling the outer wall of the plastic tube: While the inner wall of the plastic tube is being sealed, the industrial chiller delivers cooling water to the cooling circulation channel through a water pipe. The cooling water continuously cools the two refrigeration blocks. The two refrigeration blocks are in contact with the outer wall of the plastic tube, lowering the temperature of the outer wall of the plastic tube to below the temperature required for the tube wall to melt through, thereby achieving rapid cooling of the seal, so that the seal will not be broken by the gas flowing into the tube due to excessive high temperature, causing sealing failure; S4, inflation: After one end is sealed, the refrigeration block is reset, the plastic tube is removed, and the other end of the plastic tube is inserted into the inflation tube to inflate the plastic tube; S5. Low-temperature sealing of the other end: After the inflation is completed, steps S1, S2 and S3 are repeated in sequence to complete the low-temperature sealing of the other end of the plastic tube. The refrigeration block is reset to prepare for the next sealing.

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