Buckle tool

Abstract

The utility model provides a buckle tool which comprises a safety buckle and a pipe opening buckle, the safety buckle is located at the tail end of an electrode extending out of an electric heating pipe, the pipe opening buckle is located between the end of the electric heating pipe and the safety buckle, and the pipe opening buckle is used for abutting against the end of the electric heating pipe. Each of the safety buckle and the pipe orifice buckle comprises a buckle base, a gland, a round head screw and a nut; the pressing cover covers the buckle base, an extrusion locking cavity is formed between the pressing cover and the buckle base, and the extrusion locking cavity is used for allowing the electrode to penetrate through; a first through hole is formed in the buckle base, a second through hole is formed in the gland, the round head screw sequentially penetrates through the first through hole in the buckle base and the second through hole in the gland, and the nut is in threaded connection with the threaded rod end, penetrating through the gland, of the round head screw. According to the manufacturing method, the high-pressure long-size heating pipe can obtain higher pressure resistance in the manufacturing process, and meanwhile the performance quality problem of a finished product caused by the fact that moisture cannot be discharged is prevented.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure heater manufacturing technology, and in particular to a snap-fit ​​tooling. Background Technology

[0002] During the manufacturing process of high-voltage armored electric heating tubes, strict quality control of the insulation layer is required. Currently, the main method in the industry is to remove moisture through high-temperature baking, including removing moisture from the insulating raw materials and the semi-finished tubes. The purpose of moisture removal is to expel the moisture inside the insulating material to obtain good insulation performance.

[0003] However, in the current production process of industrial electric heating tubes, such as when processing long-length single-ended heating tubes using the through-core process, the end caps at the tail and the high density of the insulation layer after the tube shrinking process make it difficult for moisture to escape during high-temperature baking. Therefore, high-temperature baking has limited effectiveness. If high-temperature baking is performed before the tube shrinking process, rubber stoppers are usually used to position the electrodes and prevent them from shrinking into the heating tube. However, the rubber stoppers' insufficient temperature resistance can lead to carbonization at high temperatures, causing structural failure. Ultimately, this can result in the lead rod being pulled into the heating tube by the resistance wire, risking the heating tube being scrapped. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a snap-fit ​​fixture that enables high-pressure long-length heating tubes to achieve higher pressure resistance during manufacturing, while also preventing finished product performance and quality problems caused by the inability to expel moisture.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A snap-fit ​​fixture includes a safety buckle and a tube end buckle. Both the safety buckle and the tube end buckle are used to detachably fix to the electrode extending from the electric heating tube. The safety buckle is located at the tail end of the electrode extending from the electric heating tube, and the tube end buckle is located between the end of the electric heating tube and the safety buckle. The tube end buckle is used to abut against the end of the electric heating tube.

[0007] Both the safety buckle and the tube opening buckle include a buckle base, a pressure cap, a round-head screw, and a nut. The pressure cap covers the buckle base, and a compression locking cavity is formed between the pressure cap and the buckle base. The compression locking cavity is used for the electrode to pass through. A first through hole is provided on the buckle base, and a second through hole is provided on the pressure cap. The round-head screw passes through the first through hole on the buckle base and the second through hole on the pressure cap in sequence. The nut is threadedly connected to the threaded end of the round-head screw after it passes through the pressure cap. By tightening the nut, the pressure cap and the buckle base are brought closer together, thereby compressing and locking the electrode.

[0008] Furthermore, the buckle base has a U-shaped cross-section, including a base plate and limiting plates fixed to both ends of the base plate on the same side. The pressure cover covers the side of the limiting plate away from the base plate, and a compression locking cavity is formed between the base plate, the two limiting plates and the pressure cover.

[0009] Furthermore, two first anti-displacement slots are provided on the pressure cap of the pipe opening buckle, and two second anti-displacement slots are provided on the buckle base of the pipe opening buckle; when the pressure cap is closed on the buckle base, the first anti-displacement slots and the second anti-displacement slots are located on the same side, and the first anti-displacement slots and the second anti-displacement slots are used to snap onto the end of the electric heating tube.

[0010] Furthermore, the cap is configured as a knurled cap, with knurled patterns on the side of the cap that contacts the electrode.

[0011] Furthermore, the nut is configured as a wing nut.

[0012] This utility model has the following beneficial effects:

[0013] 1. By using the snap-fit ​​fixture proposed in this application, the electric heating tube can be baked at high temperature before the tube shrinking process, avoiding the problem of moisture being difficult to expel due to the high density of the insulation layer after the tube shrinking process. Furthermore, during the high-temperature baking before the tube shrinking process, the snap-fit ​​fixture can also prevent the rubber stopper from carbonizing at high temperatures.

[0014] 2. By using the snap-fit ​​tooling proposed in this application, the high-temperature baking and dehumidification step of the high-pressure long-size heating tube can be carried out smoothly, thereby effectively solving the problem of poor insulation performance caused by the presence of moisture in the insulation material, and enabling the high-pressure long-size heating tube to obtain higher pressure resistance during the manufacturing process. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of the electric heating tube in an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram illustrating the installation process of the snap-fit ​​fixture on the electric heating tube in an embodiment of this utility model;

[0017] Figure 3 This is a front view of the tube end buckle of the snap-fit ​​fixture in this embodiment of the present utility model;

[0018] Figure 4 This is a top view of the tube end buckle of the snap-fit ​​fixture in an embodiment of this utility model.

[0019] In the above figures: 1. Metal shell; 2. End cap; 3. Spring resistance wire; 4. Electrode; 5. Rubber plug; 6. Insulating material; 7. Safety buckle; 8. Tube opening buckle; 9. Buckle base; 10. Pressure cap; 11. Round head screw; 12. Nut; 13. Compression locking cavity; 14. First anti-displacement groove; 15. Second anti-displacement groove; 16. Pre-removal rubber plug area. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] The insulation of the insulation layer of the electric heating element requires high insulation properties during manufacturing. Therefore, it is necessary to remove moisture from the insulation material 6 through high-temperature baking. The structure of the electric heating element is as follows: Figure 1 As shown, the device includes a tubular metal casing 1, with an end cap 2 for sealing at one end and an opening at the other end. Inside the metal casing 1 is a spring resistance wire 3 connected to an electrode 4, which extends from the opening. There are two electrodes 4, each fitted with the same rubber stopper 5. When the rubber stopper 5 is engaged at the opening of the metal casing 1, the spring resistance wire 3 is in an elastically stretched state, and the rubber stopper 5 is fixed to the electrode 4 by static friction. The internal space of the metal casing 1 is filled with insulating material 6. The structure of the electric heating element is common prior art and will not be described in detail here.

[0022] The snap-fit ​​fixture in this embodiment is used for the high-temperature baking and dehumidification process of the electric heating tube.

[0023] like Figure 2-4 As shown, the buckle fixture in this embodiment includes a safety buckle 7 and a tube end buckle 8. Both the safety buckle 7 and the tube end buckle 8 are used to detachably fix the electrode 4 extending out of the metal housing 1. The safety buckle 7 is located at the tail end of the electrode 4 extending out of the metal housing 1, and the tube end buckle 8 is located between the end of the metal housing 1 and the safety buckle 7. The tube end buckle 8 is used to abut against the end of the metal housing 1.

[0024] Both the safety buckle 7 and the tube opening buckle 8 include a buckle base 9, a pressure cap 10, a round-head screw 11, and a nut 12. The pressure cap 10 covers the buckle base 9, forming a compression locking cavity 13 between the pressure cap 10 and the buckle base 9. The compression locking cavity 13 is used for the electrode 4 to pass through. In this embodiment, the buckle base 9 has a U-shaped cross-section, including a base plate and limiting plates fixed to both ends of the base plate on the same side. The pressure cap 10 covers the side of the limiting plates away from the base plate, and the compression locking cavity 13 is formed between the base plate, the two limiting plates, and the pressure cap 10. Two first anti-displacement slots 14 are provided on the pressure cap 10 of the tube opening buckle 8, and two second anti-displacement slots 15 are provided on the buckle base 9 of the tube opening buckle 8. When the pressure cap 10 is covered on the buckle base 9, the first anti-displacement slots 14 and the second anti-displacement slots 15 are located on the same side, and the first anti-displacement slots 14 and the second anti-displacement slots 15 are used to engage with the end of the metal housing 1. A first through hole is provided on the buckle base 9, and a second through hole is provided on the pressure cover 10. The round head screw 11 passes through the first through hole on the buckle base 9 and the second through hole on the pressure cover 10 in sequence. The nut 12 is set as a wing nut 12, and the pressure cover 10 is set as a knurled pressure cover 10. The side of the pressure cover 10 that contacts the electrode 4 is provided with knurled texture. The nut 12 is threadedly connected to the threaded rod end of the round head screw 11 after it passes through the pressure cover 10.

[0025] The method of fixing the buckle fixture on the electrode 4 is as follows: place the electrode 4 between the pressure cover 10 and the buckle base, and tighten the nut 12 to bring the pressure cover 10 and the buckle base 9 closer to each other, thereby squeezing and locking the electrode 4.

[0026] When using the snap-fit ​​fixture of this embodiment for high-temperature baking and dehumidification, a leakage current test is first performed before tube shrinking to identify the damp tube, and then the high-temperature baking and dehumidification process is carried out. This includes the following steps:

[0027] Step 1, Fixing Electrodes 4: Secure the safety buckles 7 to the tail ends of the two electrodes 4 extending from the metal housing 1. Securely fixing the safety buckles 7 to the electrodes 4 provides a gripping point for subsequent operations, preventing the electrodes 4 from retracting due to loss of grip.

[0028] Step 2, Pre-removal of the rubber plug 5: By gripping the safety catch 7, the electrode 4 cannot retract. At this point, pull out the rubber plug 5 and move it away from the metal housing 1. Then, install the tube end clip 8 in the original position of the rubber plug 5. The two first anti-displacement slots 14 and two second anti-displacement slots 15 on the tube end clip 8 abut against the metal housing 1, and the tube end clip 8 is locked at the opening of the metal housing 1. The position of the rubber plug 5 at this point can be defined as the pre-removal rubber plug 5 area.

[0029] Step 3, Remove the rubber plug 5: Remove the safety clip 7, pull the rubber plug 5 off the electrode 4, and then reinstall the safety clip 7. At this point, the rubber plug 5 has been removed without the electrode 4 retracting.

[0030] Step 4, High-temperature baking to remove moisture: The treated damp semi-finished product is sent into a high-temperature oven to remove moisture. Since the electric heating tube of the semi-finished product has not been shrunk at this time, its insulation layer density is low and the tube opening is not sealed with a rubber plug, making it easier to completely remove moisture.

[0031] Step 5, Install rubber plug 5: After the electric heating tube has been dehumidified, perform a leakage current test to check the dehumidification effect; check the tube opening buckle 8 to ensure that the electrode 4 is properly fixed, then remove the safety buckle 7, put the rubber plug 5 into the pre-removal rubber plug 5 area mentioned in Step 2, then take out the tube opening buckle 8, push the rubber plug 5 into the opening of the metal shell 1, and perform the tube shrinking process. After shrinking the tube, moisture is less likely to enter the heating tube.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A snap-fit ​​fixture, characterized in that: Includes a safety buckle (7) and a tube end buckle (8), both of which are detachably fixed to the electrode (4) extending from the electric heating tube. The safety buckle (7) is located at the tail end of the electrode (4) extending from the electric heating tube, and the tube end buckle (8) is located between the end of the electric heating tube and the safety buckle (7), and the tube end buckle (8) is used to abut against the end of the electric heating tube. Both the safety buckle (7) and the tube opening buckle (8) include a buckle base (9), a pressure cap (10), a round head screw (11), and a nut (12). The pressure cap (10) covers the buckle base (9), and a compression locking cavity (13) is formed between the pressure cap (10) and the buckle base (9). The compression locking cavity (13) is used for the electrode (4) to pass through. A first through hole is provided on the buckle base (9), and a second through hole is provided on the pressure cap (10). The round head screw (11) passes through the first through hole on the buckle base (9) and the second through hole on the pressure cap (10) in sequence. The nut (12) is threadedly connected to the threaded rod end of the round head screw (11) after it passes through the pressure cap (10). By tightening the nut (12), the pressure cap (10) and the buckle base (9) are brought closer to each other, thereby squeezing and locking the electrode (4).

2. The snap-fit ​​fixture according to claim 1, characterized in that: The buckle base (9) has a U-shaped cross section, including a base plate and limiting plates fixed at both ends of the base plate on the same side. The pressure cover (10) covers the side of the limiting plate away from the base plate. A compression locking cavity (13) is formed between the base plate, the two limiting plates and the pressure cover (10).

3. A snap-fit ​​fixture according to any one of claims 1-2, characterized in that: Two first anti-displacement slots (14) are provided on the pressure cap (10) of the pipe opening buckle (8), and two second anti-displacement slots (15) are provided on the buckle base (9) of the pipe opening buckle (8); when the pressure cap (10) is closed on the buckle base (9), the first anti-displacement slots (14) and the second anti-displacement slots (15) are located on the same side, and the first anti-displacement slots (14) and the second anti-displacement slots (15) are used to snap onto the end of the electric heating tube.

4. The snap-fit ​​fixture according to claim 1, characterized in that: The cap (10) is configured as a knurled cap (10), and the side of the cap (10) that contacts the electrode (4) has a knurled pattern.

5. A snap-fit ​​fixture according to claim 1, characterized in that: The nut (12) is configured as a wing nut (12).

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