A plastic light-absorbing pad matched with a thermoplastic plastic welding machine

Abstract

The application discloses a plastic light-absorbing welding pad matched with a thermoplastic welding machine, relates to the technical field of plastic welding processes, and solves the problems of high cost, poor light source availability, inconvenience of traditional laser transmission welding methods, and poor product quality stability and product control difficulty of hot air melting welding. The application comprises a gland and a welding pad main body, the welding pad main body is fixed on an equipment shell through the gland, and a soluble polytetrafluoroethylene plate is placed on the gland; the welding pad main body is composed of nano carbon black, glass fiber, titanium white powder and soluble polytetrafluoroethylene virgin granules. The welding pad main body has good light-absorbing effect, high thermal deformation resistance, good surface heat conduction effect and good fusion effect with a base material, the soluble polytetrafluoroethylene plate is directly welded on the equipment shell through light-absorbing, temperature-rising and melting of the welding pad main body, and the soluble polytetrafluoroethylene plate does not need to be punched during welding, so that the product quality stability is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of plastic welding technology, in particular to a plastic light-absorbing welding pad matched with a thermoplastic plastic welding machine. Background Art

[0002] To improve the corrosion resistance of chemical production equipment, a process commonly used is to line steel equipment casings with plastic. Currently, two main plastic welding processes are widely used: hot air melting welding and laser transmission welding. Hot air melting welding uses hot air to directly heat the weld interface, melting the thermoplastic before applying pressure to weld. Laser transmission welding penetrates translucent materials to weld the weld interface. However, these devices are bulky, expensive, and have limited light source availability, making them inconvenient to use on-site.

[0003] The hot air melting welding process, commonly known as the loose lining process, secures a translucent or transparent plastic sheet to a steel device housing at fixed points at regular intervals. Traditionally, holes are drilled in the plastic sheet at the points corresponding to the fixing points, then fasteners are used. The fasteners are then manually welded over the plastic sheet using a hot air gun. This method, due to the damage to the plastic sheet caused by the drilling and the manual labor involved, results in poor product quality and stability, making quality control difficult. Summary of the Invention

[0004] To address the aforementioned issues of high cost, poor light source availability, and inconvenience associated with traditional laser transmission welding, as well as the poor quality stability and difficult quality control of hot air melting welding products, this invention proposes a plastic light-absorbing solder pad for use with thermoplastic welding machines. The pad's main body absorbs light, exhibits high resistance to thermal deformation, exhibits excellent surface thermal conductivity, and exhibits excellent fusion with the parent material. The pad absorbs light, causing the heat to rise and melt, thereby welding the soluble polytetrafluoroethylene sheet to the device housing. This eliminates the need for drilling holes in the soluble polytetrafluoroethylene sheet during welding, ensuring product quality stability.

[0005] The present invention proposes a plastic light-absorbing pad for use with a thermoplastic plastic welding machine, which specifically comprises a pressure cover and a pad body. The pad body is fixed to a device housing via the pressure cover, and a soluble polytetrafluoroethylene plate is placed on the pressure cover. The pressure cover shields the area of ​​the pad body covered by the pressure cover (1) and conducts away excess heat from the area covered by the pad body 2. During welding, the pad body absorbs light emitted by a light source, thereby heating up and melting the soluble polytetrafluoroethylene plate to weld the soluble polytetrafluoroethylene plate to the device housing.

[0006] Furthermore, the pad main body comprises 8%-10% by mass of nano-carbon black.

[0007] Furthermore, the pad body comprises 10%-12% by mass of glass fiber.

[0008] Furthermore, the pad main body comprises titanium dioxide with a mass fraction of 1%-1.5%.

[0009] Furthermore, the pad body comprises soluble polytetrafluoroethylene virgin granules with a mass fraction of 76.5%-81%.

[0010] Furthermore, the pressure cover is coaxially fixed to the pad body, a groove is formed on the surface of the pad body, and the pressure cover is embedded in the groove.

[0011] Furthermore, the pressure cover covers 60%-80% of the upper surface area of ​​the pad body.

[0012] Furthermore, the gland is made of metal.

[0013] Furthermore, the plastic light-absorbing pad matched with the thermoplastic plastic welding machine further includes fixing screws, and the gland fixes the pad body to the device housing via the fixing screws.

[0014] Furthermore, the fixing screw is connected to the device housing by welding or threaded connection.

[0015] The beneficial effects of the plastic light-absorbing welding pad for a thermoplastic plastic welding machine described in the present invention are:

[0016] (1) The plastic light-absorbing welding pad for a thermoplastic plastic welding machine of the present invention absorbs light and melts the welding pad body, eliminating the need to punch holes in the soluble polytetrafluoroethylene sheet, thereby significantly improving the welding efficiency of the thermoplastic plastic lining and ensuring the welding quality.

[0017] (2) The plastic light-absorbing pad used in the thermoplastic plastic welding machine of the present invention protects the pad body through a cover plate, thereby ensuring that the pad body will not be crushed when welding pressure is applied due to overheating or excessive melting, thereby avoiding welding failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] In the attached figure:

[0020] Figure 1 This is a structural schematic diagram of a plastic light-absorbing welding pad used in conjunction with a thermoplastic plastic welding machine according to the present invention;

[0021] Among them: 1- gland, 2- pad body, 3- fixing screw, 4- equipment shell, 5- soluble polytetrafluoroethylene sheet. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0023] Specific implementation method 1: See Figure 1 This embodiment is described in detail. A plastic light-absorbing solder pad for a thermoplastic plastic welding machine includes a gland 1 and a solder pad body 2. The solder pad body 2 is secured to a device housing 4 via the gland 1. A soluble polytetrafluoroethylene sheet 5 (PFA sheet) is placed on the gland 1. During welding, the solder pad body 2 absorbs light from a light source, thereby heating and melting the soluble polytetrafluoroethylene sheet 5 to the device housing 4. The solder pad body 2 is injection molded using an injection molding machine.

[0024] The pad body 2 comprises components containing 8% to 10% by mass of nano-carbon black.

[0025] The pad body 2 comprises glass fiber with a mass fraction of 10%-12%.

[0026] The pad body 2 comprises titanium dioxide with a mass fraction of 1%-1.5%.

[0027] The pad body 2 comprises components of soluble polytetrafluoroethylene virgin granules with a mass fraction of 76.5%-81%.

[0028] The pressure cover 1 is coaxially fixed to the pad body 2 . A groove is provided on the surface of the pad body 2 . The pressure cover 1 is embedded in the groove to ensure that the upper surface of the pressure cover 1 is flush with the upper surface of the pad body 2 .

[0029] The pressure cap 1 covers 60%-80% of the upper surface area of ​​the pad body 2. During the welding process, the pressure cap 1 will protect the pad body 2 to ensure effective welding strength. When the pressure cap 1 covers the pad body 2 less than 60%, the pad body 2 will be overheated and the melting area will be too large. When pressure is applied during the welding process, the pad body 2 will be directly crushed, resulting in welding failure. When the pressure cap 1 covers the pad body 2 more than 80%, the effective welding area between the pad body 2 and the soluble polytetrafluoroethylene plate 5 is too small, the welding strength decreases, and the welding quality is affected.

[0030] The pressure cover 1 is made of a metal material that is opaque and has good thermal conductivity, such as 304 stainless steel, 316 stainless steel or other metal materials; the pressure cover 1 blocks light from the area covered by the pressure cover 1 of the pad body 2 and conducts away excess heat from the covered area of ​​the pad body 2 to ensure the stability of the covered area of ​​the pad body 2.

[0031] The plastic light-absorbing pad that comes with the thermoplastic plastic welding machine also includes a fixing screw 3. A through hole is opened in the center of the pad body 2. The pressure cover 1 cooperates with the through hole to fix the pad body 2 on the device housing 4; the pressure cover 1 and the fixing screw 3 are connected by a thread; the fixing screw 3 is made of a corrosion-resistant material that has good weldability with the housing or is easy to make threads, and the connection between the fixing screw 3 and the device housing 4 is welding or threaded.

[0032] The specific use process of the plastic light-absorbing welding pad matched with the thermoplastic plastic welding machine described in the present invention is as follows:

[0033] The pad body 2 is fixed to the device housing 4 by the gland 1 and the fixing screws 3, and a soluble polytetrafluoroethylene plate 5 is placed on the gland 1; the welding surface between the soluble polytetrafluoroethylene plate 5 and the pad body 2 is irradiated by a light source to melt the welding surface on the upper surface of the pad body 2. At this time, pressure is applied to the soluble polytetrafluoroethylene plate 5, squeezing the soluble polytetrafluoroethylene plate 5 and the pad body 2 so that the two are welded together.

[0034] To summarize the above implementation cases, the plastic light-absorbing welding pad for a thermoplastic plastic welding machine described in the present invention absorbs light and melts the welding pad body 2 to achieve welding, without the need to punch holes in the soluble polytetrafluoroethylene plate 5, thereby greatly improving the efficiency of thermoplastic liner welding and ensuring welding quality; the plastic light-absorbing welding pad for a thermoplastic plastic welding machine described in the present invention protects the welding pad body 2 through the cover plate 1, ensuring that the welding pad body will not be crushed when welding pressure is applied due to overheating or excessive melting, thereby avoiding welding failure.

[0035] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the invention. Reasonable combinations of the features described in the above embodiments are also possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A plastic light-absorbing pad for a thermoplastic welding machine, characterized by: The device comprises a pressure cover (1) and a pad body (2), wherein the pad body (2) is fixed to the device housing (4) through the pressure cover (1), and a soluble polytetrafluoroethylene plate (5) is placed on the pressure cover (1); the pressure cover (1) shields the area of ​​the pad body (2) covered by the pressure cover (1) and conducts away excess heat from the area covered by the pad body (2); during welding, the pad body (2) absorbs light emitted by the light source, thereby heating up and melting the soluble polytetrafluoroethylene plate (5) and the device housing (4) to be welded together; The pressure cover (1) covers 60%-80% of the upper surface area of ​​the pad body (2); the pressure cover (1) is made of a metal material that is opaque and has good thermal conductivity.

2. The plastic light-absorbing pad for thermoplastic welding machine according to claim 1, characterized in that: The pad body (2) comprises components including nano carbon black with a mass fraction of 8%-10%.

3. The plastic light-absorbing pad for thermoplastic welding machine according to claim 1, characterized in that: The pad body (2) comprises glass fiber with a mass fraction of 10%-12%.

4. The plastic light-absorbing pad for thermoplastic welding machine according to claim 1, characterized in that: The pad body (2) comprises titanium dioxide with a mass fraction of 1%-1.5%.

5. The plastic light-absorbing pad for thermoplastic welding machine according to claim 1, characterized in that: The pad body (2) comprises components of soluble polytetrafluoroethylene virgin granules with a mass fraction of 76.5%-81%.

6. The plastic light-absorbing pad for a thermoplastic welding machine according to any one of claims 1 to 5, characterized in that: The pressure cover (1) is coaxially fixed to the pad body (2); a groove is provided on the surface of the pad body (2), and the pressure cover (1) is embedded in the groove.

7. The plastic light-absorbing pad for a thermoplastic plastic welding machine according to any one of claims 1 to 5, characterized in that: The plastic light-absorbing soldering pad matched with the thermoplastic plastic welding machine further comprises a fixing screw (3), and the pressure cover (1) fixes the soldering pad body (2) on the device housing (4) via the fixing screw (3).

8. The plastic light-absorbing pad for thermoplastic welding machine according to claim 7, characterized in that: The connection between the fixing screw (3) and the device housing (4) is by welding or threaded connection.

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