Cutting mechanism for cabin trim silent cotton

Abstract

The utility model provides a kind of cutting mechanism for cabin decoration piece mute cotton, including blade body, one end of the blade body is fixedly connected with the handle, the handle is equipped with the ring, the handle end is equipped with the charging port, the upper end of the handle is equipped with the boat switch;The other end of the blade body is integrally provided with the blade head, the heating cavity in the blade head is equipped with the heating element;The utility model integrates heating and cutting, lithium battery power supply is free from external restraint, boat switch one-key start heating;Heating cavity directional heating blade edge prevents damage decoration piece, arc blade head adapts curved surface, ring is antiskid, can fast and accurate cutting mute cotton, improve efficiency and fit degree.

Description

Technical Field

[0001] This utility model belongs to the field of sound-absorbing cotton cutting technology, and in particular relates to a cutting mechanism for sound-absorbing cotton for cabin trim parts. Background Technology

[0002] During the production and after-sales maintenance of cabin trim parts, sound-absorbing cotton needs to be bonded to the inside of the trim parts to achieve sound insulation and noise reduction. Currently, the cutting of sound-absorbing cotton is divided into two scenarios: "pre-cutting before bonding" and "post-cutting finishing touches after bonding". Post-cutting mainly involves minor trimming of the redundant parts and corner gaps after the sound-absorbing cotton is bonded to the trim parts, with the aim of improving the fit and appearance.

[0003] Current post-bonding cutting methods generally rely on "heat gun + utility knife" or ordinary scissors, which presents the following technical challenges:

[0004] The sound-absorbing cotton (especially butyl rubber composite cotton) needs to be heated and softened with a hot air gun first, and then cut with a utility knife. Trimming a single spot takes a long time, and the hot air gun needs to be connected to an external power source, which limits its use in the cabin where there is no fixed power supply.

[0005] Both utility knives and scissors are used for cutting at room temperature. The sound-absorbing cotton is prone to burrs and springback, and it is difficult to accurately cut the edges of curved decorative parts. At the same time, the heating range of the hot air gun is uncontrollable, which can easily cause the plastic parts and paint on the surface of the decorative parts to age and deform due to high temperature.

[0006] Therefore, it is essential to invent a cutting mechanism for sound-absorbing cotton in cabin trim. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a cutting mechanism for sound-absorbing cotton in cabin trim, including a blade, a handle, a ring, a charging port, a boat-shaped switch, a cutting head, a heating cavity, and a heating element. One end of the blade is fixedly connected to the handle, the ring is provided on the handle, the charging port is installed at the end of the handle, and the boat-shaped switch is installed above one end of the handle. The cutting head is integrally provided at the other end of the blade, and the heating element is provided in the heating cavity of the cutting head.

[0008] The handle features a ring that allows the little finger to pass through. The handle has a built-in power supply, using two lithium batteries connected in series. The positive terminal of the lithium battery is electrically connected to the input of a rocker switch mounted on the handle, while the negative terminal is directly connected to the negative pin of the heating element. The positive pin of the heating element is electrically connected to the output of the rocker switch, forming a complete power supply circuit that enables the rocker switch to control the heating element's on / off state.

[0009] The heating element is installed in the arc-shaped heating cavity of the cutter head, which is close to the cutting edge of the cutter head and far away from the back of the cutter head, i.e., the area without a cutting edge.

[0010] The blade and the blade tip are cast as a single piece, with the blade tip located at the front end of the blade and the rear end of the blade fixedly connected to the handle.

[0011] The blade head has an arc-shaped structure with a cutting edge on the inner ring and a blade back on the outer ring. The inner side of the blade head has a cutting opening, which is the entry area.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model integrates the "heating-cutting" function into one unit, eliminating the need to switch between multiple tools. Heating can be started with a single button via a boat-shaped switch, and the blade temperature can be quickly raised to 150-180℃ (suitable for softening silent cotton), shortening the time required for trimming individual corners and improving cutting efficiency. At the same time, it is powered by a built-in lithium battery, freeing it from the constraints of an external power source and making it suitable for mobile scenarios such as after-sales modification and on-site repair.

[0014] This invention achieves localized heating of the blade by directional design of the heating cavity "close to the blade and away from the back of the blade," thus avoiding heat conduction to the back of the blade and damage to the decorative parts. The arc-shaped blade head is adapted to the curved contour of the cabin decorative parts, and with the softening properties of the sound-absorbing cotton after heating, it can accurately cut along the edge of the decorative parts, with a smooth cut without burrs, improving the fit.

[0015] In addition, the finger ring design of the handle of this utility model allows the little finger to pass through the positioning, which, together with the hand grip, effectively prevents the knife from slipping in a narrow space. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a partial cross-sectional structural diagram of the blade of this utility model.

[0018] In the picture:

[0019] 1. Blade body; 2. Handle; 3. Finger ring; 4. Charging port; 5. Rocker switch; 6. Blade tip; 7. Heating cavity; 8. Heating element. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0022] As attached Figure 1 To be continued Figure 2 As shown:

[0023] This utility model provides a cutting mechanism for sound-absorbing cotton in cabin trim, including a blade 1, a handle 2, a ring 3, a charging port 4, a boat-shaped switch 5, a cutting head 6, a heating cavity 7, and a heating element 8. One end of the blade 1 is fixedly connected to the handle 2. The handle 2 has the ring 3. The charging port 4 is installed at the end of the handle 2. The boat-shaped switch 5 is installed above one end of the handle 2. The other end of the blade 1 has the cutting head 6 integrally formed. The heating cavity 7 of the cutting head 6 contains the heating element 8.

[0024] Furthermore, a finger ring 3 is integrally formed on the lower part of the outer side wall of the handle 2. The finger ring 3 is made of ABS engineering plastic and is injection molded integrally with the handle 2 body. Its inner diameter is designed to be 18-22mm, which is suitable for an adult's little finger to pass through. The inner side wall of the finger ring 3 is provided with anti-slip texture. When the operator holds the handle 2, the little finger can pass through the finger ring 3 to fix the tool in place and prevent the handle 2 from slipping when pulling and cutting in the narrow space of the machine cabin.

[0025] Furthermore, the handle 2 has a pre-installed cylindrical battery compartment. The power supply unit inside the battery compartment uses two 18650 lithium batteries connected in series. Each lithium battery has a rated voltage of 3.7V and a capacity of 2000mAh, resulting in a total voltage of 7.4V and a total capacity of 2000mAh. The lithium batteries are secured by elastic stainless steel clips within the battery compartment to prevent displacement due to tool movement. The positive terminal of the lithium battery is connected via a... The nickel-plated copper wire is wrapped with a PVC insulation layer and is welded to the input pin of the rocker switch 5 (model KCD1-101) with a rated current of 3A, which is embedded in the upper part of the knife handle 2. The negative terminal of the lithium battery is directly welded to the negative terminal pin of the heating element 8 through a nickel-plated copper wire of the same specification. The positive terminal pin of the heating element 8 is welded to the output pin of the rocker switch 5 through a silicone wire that can withstand a high temperature of 200℃. The above connection constitutes a complete power supply circuit. The rocker switch 5 is fixed in the mounting groove of the knife handle 2 with a groove depth of 8mm by a snap-fit ​​method, which is adapted to the thickness of the switch. Pressing the rocker switch 5 can realize self-locking on and off, thereby controlling the power supply start and stop of the heating element 8.

[0026] Furthermore, the heating element 8 is made of Cr20Ni80 nickel-chromium alloy heating wire with a diameter of 0.2mm, a length of 50mm, and a rated power of 35W. Two of them are fixedly installed in the arc-shaped heating cavity 7 inside the cutter head 6 using high-temperature resistant ceramic clip material Al2O3. The heating cavity 7 and the cutter head 6 are integrally cast from 440C stainless steel, and their length matches the arc length of the cutter head 6. The distance between the centerline of the heating cavity 7 and the inner edge of the cutter head 6 is controlled at 1.5mm, and the distance between the centerline and the uncut area of ​​the outer back of the cutter head 6 is controlled at 5mm. The opening end of the heating cavity 7 is sealed to the cutter head 6 by welding with a 0.5mm thick stainless steel cover plate. The inside of the cover plate is coated with high-temperature resistant sealant (300℃) to prevent oil and moisture from entering the cavity and affecting the performance of the heating element 8. The lead wire of the heating element 8 passes through the opening at the end of the heating cavity 7. The wire hole connects to the power supply circuit inside the tool holder 2. The wire hole is sealed with a silicone sealing ring to achieve electrical insulation and waterproofing / dustproofing.

[0027] Furthermore, the blade body 1 and the blade tip 6 are integrally formed from 440C martensitic stainless steel using a precision investment casting process, ensuring structural strength and dimensional accuracy. The blade body 1 has a long strip structure, with its front end seamlessly transitioning to the root of the blade tip 6. The blade tip 6 is located at the front end of the blade body 1, forming a 15° angle with the axis of the blade body 1 to accommodate the cutting angle of the curved surface of the cabin trim. The outer circumference of the rear end of the blade body 1 is machined with an M8 external thread with a thread length of 15mm, which mates with the M8 internal thread hole at the front end of the handle 2. The threaded connection is wrapped with PTFE tape to enhance sealing and is locked with a stainless steel anti-loosening nut M8 to prevent loosening due to vibration during long-term use. A 1mm thick nitrile rubber gasket is installed between the connecting ends of the blade body 1 and the handle 2 to further improve waterproof performance and connection stability.

[0028] Furthermore, the blade head 6 has an overall arc-shaped structure, and its material is the same as the blade body 1, which is 440C stainless steel. The inner edge of the blade head 6 is polished with a diamond wheel to form a sharp cutting edge with an angle of 30°. The blade surface is treated with a titanium plating layer with a thickness of 5μm to enhance wear resistance and anti-stick performance. The outer edge of the blade head 6 is a bladeless back with a thickness of 3mm and rounded edges to avoid scratching the operator or the surface of the cabin trim during operation. The inner side of the blade head 6, near the blade edge, forms a cutting opening, which is the area where the sound-absorbing cotton enters. It is suitable for the thickness of common cabin sound-absorbing cotton, which is 2-8mm. The entrance end of the cutting opening has a trumpet-shaped expansion angle of 45°, which facilitates the smooth entry of the sound-absorbing cotton into the cutting area of ​​the blade when pulling and cutting, improving cutting efficiency and cut smoothness.

[0029] The working principle is as follows: First, the operator holds the knife handle 2 with his hand, and at the same time, passes his little finger through the finger ring 3 to fix the tool in place and prevent the knife handle 2 from slipping during operation.

[0030] Then, press the rocker switch 5 on the tool holder 2 to trigger the power supply circuit of the lithium battery in the battery compartment inside the tool holder 2. The current is transmitted from the positive terminal of the lithium battery to the rocker switch 5 through the wire, and then from the output terminal of the rocker switch 5 to the heating element 8 through the high-temperature resistant silicone wire.

[0031] Next, the heating element 8 starts to heat up after being powered on. The heat is conducted directionally through the heating cavity 7 inside the cutter head 6 to the inner ring blade of the cutter head 6, raising the blade temperature to meet the requirements of softening and cutting the sound-absorbing cotton.

[0032] Afterwards, the operator aligned the excess sound-absorbing cotton glued to the cabin trim with the cutting opening on the inside of the blade head 6, and pulled the blade body 1 to allow the sound-absorbing cotton to enter the cutting area of ​​the blade head 6 through the cutting opening.

[0033] Meanwhile, since the blade has been heated by the heating element 8, it can quickly soften the material when it comes into contact with the sound-absorbing cotton. Combined with the arc-shaped structure of the blade head 6 and the sharpness of the blade, it can achieve precise cutting of the sound-absorbing cotton. The outer ring of the blade head 6 has no blade and the edge is rounded, which can avoid scratching the decorative parts or the operator.

[0034] After cutting, press the boat-shaped switch 5 again to cut off the power supply circuit, and the heating element 8 will stop heating. Finally, when the lithium battery in the handle 2 is low on power, recharge the lithium battery through the charging port 4 at the end of the handle 2 for the next use.

[0035] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A cutting mechanism for sound-absorbing cotton in cabin trim, characterized in that, The device includes a blade (1), a handle (2), a ring (3), a charging port (4), a rocker switch (5), a blade tip (6), a heating cavity (7), and a heating element (8). One end of the blade (1) is fixedly connected to the handle (2). The ring (3) is provided on the handle (2). The charging port (4) is installed at the end of the handle (2). The rocker switch (5) is installed above one end of the handle (2). The blade tip (6) is integrally provided at the other end of the blade (1). The heating element (8) is provided in the heating cavity (7) provided in the blade tip (6).

2. The cutting mechanism for sound-absorbing cotton in cabin trim as described in claim 1, characterized in that: The finger ring (3) on the handle (2) allows the little finger to pass through. The handle (2) has a built-in power supply device, which uses two lithium batteries connected in series as the power source. The positive terminal of the lithium battery is electrically connected to the input terminal of the rocker switch (5) mounted on the handle (2), and the negative terminal of the lithium battery is directly connected to the negative terminal pin of the heating element (8). The positive terminal pin of the heating element (8) is electrically connected to the output terminal of the rocker switch (5), forming a complete power supply circuit, so as to realize the on / off control of the heating element (8) by the rocker switch (5).

3. The cutting mechanism for sound-absorbing cotton in cabin trim as described in claim 2, characterized in that: The heating element (8) is installed in the arc-shaped heating cavity (7) of the blade (6). The heating cavity (7) is close to the blade edge of the blade (6) and far away from the back of the blade (6), i.e., the area without a blade edge.

4. The cutting mechanism for sound-absorbing cotton in cabin trim as described in claim 3, characterized in that: The blade (1) and the blade head (6) are integrally cast. The blade head (6) is located at the front end of the blade (1), and the rear end of the blade (1) is fixedly connected to the handle (2).

5. The cutting mechanism for sound-absorbing cotton in cabin trim as described in claim 4, characterized in that: The blade (6) has an arc-shaped blade structure with a blade edge on the inner ring and a blade back on the outer ring. The inner side of the blade (6) is a cutting opening, which is the entry area.

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