Positioning and reaming device for welding plastic automobile fuel tank

Abstract

The invention relates to a positioning and chambering device for welding a plastic automobile fuel tank, which comprises a frame provided with a welding station and a chambering station; the chambering mechanism is used for chambering the oil tank preformed hole; the external suction mechanism is used for adsorbing scraps outside the expanded hole of the oil tank; the inner suction mechanism is used for adsorbing sweeps in the expanded hole of the oil tank; and the inner suction mechanism extends into the inner wall of the oil tank and receives the scraps which are not adsorbed by the outer suction mechanism. According to the device, the sealed space is formed outside the oil tank through the outer suction mechanism, vacuumizing treatment is carried out, then outer waste chips can be sucked, the inner suction mechanism is mainly used for collecting the waste chips falling into the oil tank, and it is guaranteed that reaming work is carried out in a high-quality mode.

Description

Technical Field

[0001] This application relates to the technical field of welding reaming equipment, and in particular to a positioning reaming device for welding plastic automobile fuel tanks. Background Technology

[0002] With the development of lightweight vehicles, multi-layer co-extruded blow-molded plastic fuel tanks have completely replaced metal fuel tanks and become the mainstream. In the manufacturing process of plastic fuel tanks, waste plastic fuel tanks themselves are important recycling resources. Through mechanical or chemical recycling technologies, they can be reprocessed into recycled plastic pellets or converted into fuel oil, achieving recycling.

[0003] In addition to forming the tank body, various fuel system accessories, such as refueling pipe seats, breather valves, and fuel pump flanges, need to be welded to the surface of the tank body. Before hot plate welding or friction welding, holes must be made at predetermined positions on the tank body or the reserved holes must be enlarged to ensure the flatness of the welding surface and the accuracy of the hole diameter.

[0004] Existing reaming devices mostly use open-type rotary cutting, which easily produces long strips of plastic chips or powder that fall into the fuel tank. Due to the complex structure of the fuel tank, such as the presence of baffles, once the chips fall in, they are extremely difficult to clean, which poses a potential risk of clogging to the fuel pump and engine. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a positioning and expanding device for welding plastic automotive fuel tanks.

[0006] The positioning and expanding device for welding plastic automotive fuel tanks provided in this application adopts the following technical solution: A positioning and expanding device for welding plastic automotive fuel tanks, comprising: The machine frame is equipped with welding and reaming stations; A hole-reaming mechanism is used to ream holes pre-drilled in the fuel tank. An external suction mechanism is used to adsorb debris from the outside of the fuel tank's enlarged orifice; and The internal suction mechanism is used to adsorb waste debris inside the enlarged hole of the oil tank; The internal suction mechanism extends into the inner wall of the oil tank and receives waste debris that the external suction mechanism has not adsorbed.

[0007] Furthermore, the hole-enlarging mechanism includes: The support frame is lifted and mounted on the machine frame; The cutting tool has a hollow interior and spiral grooves arranged circumferentially. The power unit controls the high-speed rotation of the cutting tool; and The suction component is used to draw negative pressure into the inside of the tool; The spiral groove is provided with multiple adsorption holes; the cutter rotates at high speed on the support.

[0008] Furthermore, the external suction mechanism includes: A sealing cover is installed above the fuel tank, and Multiple sealing ports are also connected to the adsorption assembly; The sealing cover is disposed on the bracket and is made of an elastic material.

[0009] Furthermore, the internal suction assembly includes: A guide rod, positioned at the center of the tool, with a cross-sectional dimension smaller than that of the tool; and A receiving component used to collect debris that falls inside the enlarged hole area; The cross-sectional dimension of the guide rod is smaller than the size of the reserved hole in the oil tank, and it extends into the oil tank.

[0010] Furthermore, the receiving component includes: The slide cylinder is elastically slidably mounted outside the guide rod; A diffuser section is used to collect internal waste debris after it diffuses outward from the guide; and The control unit is used to control the movement of the diffusion assembly; The slide cylinder is slidably disposed outside the guide rod and its cross-sectional dimensions are smaller than the diameter of the reserved hole in the oil tank.

[0011] Furthermore, the diffusion section includes: Multiple outward-expanding rods are rotatably connected to the guide rods. The transmission rod has one end hinged to the outer expansion rod and the other end hinged to the outer expansion rod; and The receiving component is located on the bottom surface of the outward expansion rod and is provided in multiple forms; The overlapping area of ​​multiple receiving components is larger than the interface size of the outer expansion hole, and the hinge position between the outer expansion rod and the transmission rod is close to the slide cylinder.

[0012] Furthermore, the power unit includes: The shape memory alloy wire is vertically arranged and one end is fixedly connected to the side wall of the guide rod. The power block has a concave cavity and is fixedly connected to the other end of the shape memory alloy wire; and The lever has one end that corresponds to the concave cavity of the power block and the other end that abuts against the top of the slide cylinder. The lever and guide rod are rotatably connected close to the power block. When the shape memory alloy wire is energized and heats up, it begins to undergo a phase change, which controls the lever to swing and achieves downward sliding of the slide cylinder.

[0013] Furthermore, the receiving element is configured in an arc shape and protrudes outward in a direction away from the guide rod.

[0014] In summary, the beneficial technical effects of this application are as follows: 1. The external suction mechanism forms a sealed space outside the fuel tank and performs vacuuming, which can suck up external debris. The internal suction mechanism mainly collects debris that falls into the fuel tank, which can greatly reduce the probability of debris falling into the fuel tank. 2. As the cutting tool moves downwards, the sealing cover also moves downwards, and the sealing cover is continuously compressed, thus sealing the space between the sealing cover and the oil tank. The sealing cover and the surface of the oil tank form a closed chamber, creating a stable high negative pressure field in the dust collection area. Outside air can only rush in at high speed from the edge gaps of the sealing cover, forming an "air curtain" to block the overflow path of waste chips. This solves the problem of waste chips flying around and polluting the workshop environment in open hole expansion. Of course, some waste chips on the suction hole of the cutting tool may remain in the spiral groove, but this will not cause the waste chips to fall into the oil tank. When the cutting tool completes the hole expansion work and is removed from the oil tank, if the vacuum tube of the cutting tool is stopped and the vacuum work inside the sealing cover is resumed, the waste chips on the cutting tool can also be drawn into the suction box. 3. When the guide rod enters the oil tank, the receiving component is in contact with the guide rod. The receiving component is arc-shaped and protrudes outward away from the guide rod. Although the receiving component protrudes outward, its size does not affect the guide rod's entry into the oil tank. After the shape memory alloy wire begins to conduct heat, the power block begins to move. The corresponding end of the lever, under the action of the concave cavity, begins to swing towards the guide rod. By amplifying the stroke through the lever's lever arm ratio, the slide cylinder is pushed to generate sufficient displacement on the guide rod, thereby opening the diffuser. The torsion spring also deforms, causing the slide cylinder to move downward. The transmission rod drives the outward expansion rod to diffuse outward. Since multiple outward expansion rods move together, the receiving component opens up and covers the peripheral wall of the pre-drilled hole. That is, the peripheral walls of the pre-drilled hole and the subsequent expanded hole are all mapped onto the receiving component, which can collect waste. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the internal suction mechanism according to an embodiment of this application; Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0016] Explanation of reference numerals in the attached figures: 1. Rack; 2. Hole reaming mechanism; 21. Support; 22. Cutting tool; 23. Spiral groove; 24. Adsorption hole; 3. External suction mechanism; 31. Sealing cover; 32. Sealing port; 40. Internal suction assembly; 41. Guide rod; 42. Slide cylinder; 43. External expansion rod; 44. Transmission rod; 45. Receiving component; 46. Shape memory alloy wire; 47. Power block; 48. Concave cavity; 49. Lever. Detailed Implementation

[0017] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] This application discloses a positioning and expanding device for welding plastic automotive fuel tanks. (Refer to...) Figures 1-3 It includes: a frame 1, which is equipped with a welding station and a hole-expanding station; in this embodiment, in order to facilitate the simultaneous operation of the welding process and the hole-expanding process, two processes are set on the frame 1. When it is necessary to expand the hole at the reserved hole position of the oil tank to facilitate the subsequent welding of the corresponding parts, friction welding is adopted for the welding work in this embodiment, so that the hole-expanding and welding processes can be completed simultaneously.

[0019] The hole-reaming mechanism 2 is used to ream the reserved hole of the fuel tank. In this embodiment, the reserved hole of the fuel tank is reamed by a hole-reaming cutter 22, that is, the hole-reaming cutter 22 is inserted into the reserved hole of the fuel tank, and the hole-reaming work is achieved by rotating at high speed and gradually inserting the hole-reaming cutter 22 into the reserved hole of the fuel tank. Since the cutter 22 has the effect of cutting the reserved hole position of the fuel tank during high-speed rotation, waste chips are easily generated during the rotational cutting hole-reaming process. The main purpose of this embodiment is to quickly and efficiently remove the waste chips. The external suction mechanism 3 is used to adsorb waste debris outside the oil tank expansion hole; and the internal suction mechanism is used to adsorb waste debris inside the oil tank expansion hole. The external suction mechanism 3 forms a sealed space outside the oil tank and performs vacuum treatment, thereby allowing external waste debris to be sucked up. The internal suction mechanism mainly collects waste debris that falls into the oil tank, thereby greatly reducing the probability of waste debris falling into the oil tank.

[0020] The reaming mechanism 2 includes: a support 21, which is lifted and mounted on the frame 1; a cutter 22, which is hollow inside and has a spiral groove 23 arranged circumferentially; the support 21 is reciprocated vertically by a cylinder or hydraulic rod; a power component controls the high-speed rotation of the cutter 22; the high-speed rotation of the cutter 22 is achieved through a transmission method of motor, reducer and belt (not shown in the figure); and a suction component for drawing negative pressure inside the cutter 22; the suction component in this embodiment includes a suction box, a vacuum pump and multiple vacuum tubes, and each of the multiple vacuum tubes is equipped with a solenoid valve, one of which is connected to the top of the cutter 22. Of course, in this embodiment... To prevent the vacuum tube from rotating with the tool 22, a rotating structure is used to connect the tool 22 and the corresponding vacuum tube. This will not be elaborated further in this embodiment. It is only necessary to ensure that the tool 22 is sealed to the vacuum tube and that the tool 22 can be selected independently. Preferably, the non-rotating structure is fixedly connected to the support 21 and rotatably connected to the top of the tool 22. Multiple adsorption holes 24 are provided in the spiral groove 23. The tool 22 rotates at high speed on the support 21. The adsorption holes 24 are opened in the spiral groove 23 of the tool 22. The chips are drawn into the tool 22 as soon as they are cut off, before the cutting heat dissipates and static electricity accumulates, which greatly reduces the probability of chips flying.

[0021] The external suction mechanism 3 includes: a sealing cover 31, which covers the oil tank, and multiple sealing ports 32, which are also connected to the adsorption assembly; the sealing cover 31 is mounted on the bracket 21 and is made of an elastic material, such as silicone or rubber, and the sealing ports 32 are located on both sides of the cutter 22, preferably symmetrically arranged, and the corresponding sealing ports 32 are connected to the vacuum tube. As the cutter 22 moves downward, the sealing cover 31 also moves downward, and the sealing cover 31 is continuously compressed, thereby sealing the space between the sealing cover 31 and the oil tank, and forming a closed cavity with the surface of the oil tank. The chamber creates a stable high negative pressure field in the dust collection area, allowing outside air to rush in at high speed through the gaps at the edge of the sealing cover 31, forming an "air curtain" to block the overflow path of waste debris. This solves the problem of waste debris flying around and polluting the workshop environment in open-type hole expansion. Of course, some waste debris on the suction hole 24 of the tool 22 may remain in the spiral groove 23, but this will not cause the waste debris to fall into the oil tank. When the tool 22 has completed the hole expansion work and has been removed from the oil tank, if the vacuum tube of the tool 22 is stopped and the vacuum work in the sealing cover 31 is resumed, the waste debris on the tool 22 can also be drawn into the suction box.

[0022] The internal suction assembly 40 includes: a guide rod 41, which is located at the center of the tool 22 and has a cross-sectional dimension smaller than that of the tool 22; and a receiving assembly for receiving waste chips falling inside the enlarged hole. The cross-sectional dimension of the guide rod 41 is smaller than that of the reserved hole in the oil tank and extends into the oil tank. After the guide rod 41 passes through the reserved hole, it enters the interior of the oil tank. At this time, the receiving assembly also enters the inner wall of the oil tank along with the guide rod 41. The receiving component includes: a slide cylinder 42, which is elastically slidably disposed outside the guide rod 41; a diffuser for collecting internal waste after diffusion from the outside of the guide rod; and a control unit for controlling the movement of the diffuser component; the slide cylinder 42 is slidably disposed outside the guide rod 41 and its cross-sectional size is smaller than the diameter of the reserved hole in the oil tank; a boss is fixedly connected to the bottom of the guide rod 41, the slide cylinder 42 is slidably sleeved on the outside of the guide rod 41, and a spring is sleeved on the part of the guide rod 41 between the bottom of the slide cylinder 42 and the boss, the two ends of the spring are fixedly connected to the bottom of the slide cylinder 42 and the top of the boss respectively, so as to realize the elastic effect of the slide cylinder 42, and the initial state of the slide cylinder 42 is a natural deformation state.

[0023] The diffusion section includes: an outer expansion rod 43, which is rotatably connected to the guide rod 41 and is configured in multiple ways; a transmission rod 44, which is hinged at one end to the outer expansion rod 43 and at the other end to the outer expansion rod 43; the axis of the outer expansion rod 43 hinged to the guide rod 41 is horizontal and perpendicular to the axis of the guide rod 41; the multiple outer expansion rods 43 are equally spaced relative to the same center; as the slide cylinder 42 moves downward, the transmission rod 44 swings the outer expansion rod 43 away from the guide rod 41, thereby achieving the diffusion effect of the outer expansion rod 43. The receiving element 45 is disposed on the bottom surface of the expanding rod 43 and there are multiple receiving elements 45. The overlapping area of ​​the multiple receiving elements 45 is larger than the interface size of the expanding hole. The position where the expanding rod 43 and the transmission rod 44 are hinged is close to the slide cylinder 42. In this embodiment, there can be multiple receiving elements 45, or they can be connected together. The receiving element 45 is made of an elastic material. For ease of understanding, the expanding rod 43, the transmission rod 44 and the receiving element 45 can be formed into an umbrella-shaped structure. This allows the receiving element 45 to unfold when the slide cylinder 42 moves downward. Since the receiving element 45 has elastic properties, repeated unfolding and contraction will not affect the service life of the receiving element 45, ensuring that the receiving element 45 can normally receive waste.

[0024] The power unit includes: a shape memory alloy wire 46, vertically arranged with one end fixedly connected to the side wall of the guide rod 41; a power block 47, with a concave cavity 48 and fixedly connected to the other end of the shape memory alloy wire 46; and a lever 49, the corresponding end of the lever 49 corresponding to the concave cavity 48 of the power block 47 and the other end abutting against the top of the slide cylinder 42; the lever 49 is rotatably connected to the guide rod 41 near the power block 47, the concave cavity 48 is open at one end facing the lever 49, and a torsion spring is also provided between the lever 49 and the guide rod 41. The corresponding end of the lever 49 moves within the concave cavity 48 of the power block 47. Therefore, when the shape memory alloy wire 46 is made of iron-nickel alloy material, it begins to retract when it exceeds the phase transition temperature. In this embodiment, an electric current structure is also required for the shape memory alloy wire 46, which will not be described in detail here. Compared with other power structures, such as cylinders and motors, the shape memory alloy wire 46 in this embodiment is small in size, easy to install on the guide rod 41, and ensures that it can be inserted into the oil tank.

[0025] When the guide rod 41 enters the oil tank, the receiving part 45 is in contact with the guide rod 41. The receiving part 45 is arc-shaped and protrudes outward in a direction away from the guide rod 41. Although the receiving part 45 protrudes outward, its size does not affect the guide rod 41 from entering the oil tank. After the shape memory alloy wire 46 begins to conduct heat, the power block 47 begins to move. The corresponding end of the lever 49, under the action of the concave cavity 48, begins to swing towards the guide rod 41. Through the lever arm ratio of the lever 49, the stroke is amplified, pushing the slide cylinder 42 to produce sufficient displacement on the guide rod 41, thereby opening the diffuser. The torsion spring also deforms, that is, the slide cylinder 42 moves downward. The transmission rod 44 drives the outward expansion rod 43 to spread outward. Due to the multiple outward expansion... When rod 43 moves together, receiving component 45 expands and covers the peripheral wall of the pre-drilled hole. That is, the peripheral wall of the pre-drilled hole and the subsequent hole expansion are both mapped onto receiving component 45, which can collect waste. Even if the tool 22 and guide rod 41 move downward, it will not affect the collection of waste by receiving component 45. The outward convex structure of receiving component 45 facilitates the collection of waste. After the hole expansion work is completed, the power to memory alloy wire 46 is cut off. After it gradually cools down, lever 49 returns to the initial position under the action of torsion spring. At the same time, slide cylinder 42 returns to the initial position under the action of spring. Receiving component 45 follows the outward expansion rod 43 and fits with guide rod 41. Since there is little waste falling into the oil tank, the receiving component 45 does not affect the smooth removal from the oil tank after it is closed.

[0026] The implementation principle of the positioning and expanding device for welding plastic automobile fuel tanks in this application embodiment is as follows: As the cutting tool 22 moves downward continuously, the sealing cover 31 also moves downward continuously. The sealing cover 31 is continuously squeezed, thereby sealing the sealing space between the sealing cover 31 and the fuel tank. The sealing cover 31 and the surface of the fuel tank form a closed chamber, which makes the dust suction area form a stable high negative pressure field. Outside air can only rush in at high speed from the edge gap of the sealing cover 31, forming an "air curtain" to block the overflow path of waste debris, thus solving the problem of waste debris flying around and polluting the workshop environment in open expansion. Of course, some waste debris on the suction hole 24 on the cutting tool 22 may always remain in the spiral groove 23, but it will not cause the waste debris to fall into the fuel tank. When the cutting tool 22 completes the expansion work and is taken out of the fuel tank, if the vacuum tube of the cutting tool 22 is stopped and the vacuum work in the sealing cover 31 is continued, the waste debris on the cutting tool 22 can also be drawn into the suction box. When the guide rod 41 enters the oil tank, the receiving part 45 is in contact with the guide rod 41. The receiving part 45 is set in an arc shape and protrudes outward in the direction away from the guide rod 41. Although the receiving part 45 protrudes outward, its protrusion size will not affect the guide rod 41 from entering the oil tank. After the shape memory alloy wire 46 starts to conduct heat, the power block 47 starts to move. The corresponding end of the lever 49 starts to swing towards the guide rod 41 under the action of the concave cavity 48. Through the lever arm ratio of the lever 49, the stroke is amplified, pushing the slide cylinder 42 to produce sufficient displacement on the guide rod 41, thereby opening the diffuser. The torsion spring also deforms, that is, the slide cylinder 42 moves downward. The transmission rod 44 drives the outward expansion rod 43 to diffuse outward. Since multiple outward expansion rods 43 move together, the receiving part 45 is opened and covers the peripheral wall of the reserved hole. That is, the peripheral walls of the reserved hole and the subsequent expanded hole are all mapped on the receiving part 45, which can collect waste.

[0027] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A positioning and expanding device for welding plastic automotive fuel tanks, characterized in that, include: The machine frame is equipped with welding and reaming stations; A hole-reaming mechanism is used to ream holes pre-drilled in the fuel tank. An external suction mechanism is used to adsorb debris from the outside of the fuel tank's enlarged orifice; and The internal suction mechanism is used to adsorb waste debris inside the enlarged hole of the oil tank; The internal suction mechanism extends into the inner wall of the oil tank and receives waste debris that the external suction mechanism has not adsorbed.

2. The positioning and expanding device for welding plastic automobile fuel tanks according to claim 1, characterized in that, The hole-expanding mechanism includes: The support frame is lifted and mounted on the machine frame; The cutting tool has a hollow interior and spiral grooves arranged circumferentially. The power unit controls the high-speed rotation of the cutting tool; and The suction component is used to draw negative pressure into the inside of the tool; The spiral groove is provided with multiple adsorption holes; the cutter rotates at high speed on the support.

3. The positioning and expanding device for welding plastic automobile fuel tanks according to claim 2, characterized in that, The external suction mechanism includes: A sealing cover is installed above the fuel tank, and Multiple sealing ports are also connected to the adsorption assembly; The sealing cover is disposed on the bracket and is made of an elastic material.

4. The positioning and expanding device for welding plastic automobile fuel tanks according to claim 3, characterized in that, The internal suction component includes: A guide rod, positioned at the center of the tool, with a cross-sectional dimension smaller than that of the tool; and A receiving component used to collect debris that falls inside the enlarged hole area; The cross-sectional dimension of the guide rod is smaller than the size of the reserved hole in the oil tank, and it extends into the oil tank.

5. The positioning and expanding device for welding plastic automobile fuel tanks according to claim 4, characterized in that, The receiving component includes: The slide cylinder is elastically slidably mounted outside the guide rod; A diffuser section is used to collect internal waste debris after it diffuses outward from the guide; and The control unit is used to control the movement of the diffusion assembly; The slide cylinder is slidably disposed outside the guide rod and its cross-sectional dimensions are smaller than the diameter of the reserved hole in the oil tank.

6. The positioning and expanding device for welding plastic automobile fuel tanks according to claim 5, characterized in that, The diffusion section includes: Multiple outward-expanding rods are rotatably connected to the guide rods. The transmission rod has one end hinged to the outer expansion rod and the other end hinged to the outer expansion rod; and The receiving component is located on the bottom surface of the outward expansion rod and is provided in multiple forms; The overlapping area of ​​multiple receiving components is larger than the interface size of the outer expansion hole, and the hinge position between the outer expansion rod and the transmission rod is close to the slide cylinder.

7. A positioning and expanding device for welding plastic automobile fuel tanks according to claim 6, characterized in that, The power unit includes: The shape memory alloy wire is vertically arranged and one end is fixedly connected to the side wall of the guide rod. The power block has a concave cavity and is fixedly connected to the other end of the shape memory alloy wire; and The lever has one end that corresponds to the concave cavity of the power block and the other end that abuts against the top of the slide cylinder. The lever and guide rod are rotatably connected close to the power block. When the shape memory alloy wire is energized and heats up, it begins to undergo a phase change, which controls the lever to swing and achieves downward sliding of the slide cylinder.

8. A positioning and expanding device for welding plastic automobile fuel tanks according to claim 7, characterized in that, The receiving element is configured in an arc shape and protrudes outward in a direction away from the guide rod.

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