Scooter body injection mold

Abstract

The invention relates to the technical field of injection molds, in particular to a scooter body injection mold which comprises an upper mold and a lower mold, an upper cavity is formed in the bottom surface of the upper mold, a heat preservation water channel with an inverted-L-shaped section is formed in the position, located on the periphery of the upper cavity, in the upper mold, and an outlet of the heat preservation water channel is connected with a temperature control valve; a lower cavity is formed in the top surface of the lower mold, a plurality of cooling channels are formed in the lower mold and located below the lower cavity, and an arc-shaped air bag is clamped to the top of the inner wall of the inlet section of each cooling channel and used for reducing the water hammer effect when cooling water enters; according to the injection mold, edge short shooting, weld marks and water hammer impact are eliminated through double mechanisms of accurate heat compensation of the inverted-L-shaped heat preservation water channel and flexible buffering of the arc-shaped air bag, and high surface quality and high-efficiency demolding of a scooter body are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, in particular to an injection mold for a scooter body. Background Art

[0002] Injection molds are production tools that fill and solidify a mold cavity with high-temperature molten plastic, ultimately creating a specifically shaped part. Scooter bodies are typical large, thin-walled structural components, and are commonly manufactured using injection molds. These molds consist of a fixed and movable molds forming a closed cavity. Molten plastic is injected through the injection molding machine's nozzle into the mold's gating system, filling the cavity under pressure. After cooling and finalizing its shape, the mold opens and ejects the finished body.

[0003] Despite mature injection mold technology, significant deficiencies still exist in the production of scooter panels. These deficiencies are: 1. Degraded melt flowability at the edges of the upper mold cavity: As the molten plastic diffuses from the runner in the center of the mold toward the peripheral cavities, rapid heat dissipation and large temperature gradients at the edges cause a sharp increase in viscosity at the melt front. This phenomenon can easily lead to defects such as insufficient fill at the outer edges of the panel (short shots), noticeable weld marks, or surface flow lines, severely impacting structural strength and appearance yield. 2. Low panel strength. Some scooter panel injection molds utilize pulse cooling technology in their lower mold cooling systems. This technology regulates flow by intermittently opening and closing cooling water valves, offering fast response and efficient temperature control. However, pulse cooling has a serious drawback during dynamic regulation: sudden changes in cooling water flow velocity at the inlet section of the pipe trigger a severe water hammer effect, generating high-frequency pressure shock waves. This effect not only causes pipeline vibration and noise, but also leads to periodic oscillations in the mold temperature field, resulting in uneven residual stress distribution within the plastic part, significantly reducing the panel's strength and lifespan.

[0004] Therefore, the present invention provides a scooter body injection mold to solve the problems raised in the above background technology. Summary of the Invention

[0005] The purpose of the present invention is to provide an injection mold for a scooter body, which solves the problems proposed in the existing background technology, such as short shots, weld marks and flow defects caused by the deterioration of the edge melt fluidity during the injection molding process of the scooter body, and the water hammer effect caused by pulse cooling causing periodic oscillations in the mold temperature field and uneven residual stress distribution, resulting in reduced body strength.

[0006] In order to solve the above technical problems, the present invention provides a scooter body injection mold, including an upper mold and a lower mold, an upper cavity is provided on the bottom surface of the upper mold, and an insulation water channel with an inverted L-shaped cross-section is provided in the upper mold at the outer periphery of the upper cavity, and the outlet of the insulation water channel is connected to a temperature control valve; a lower cavity is provided on the top surface of the lower mold, and a plurality of cooling channels are provided in the lower mold below the lower cavity, and an arc-shaped airbag is clamped on the top of the inner wall of the inlet section of the cooling channel, and the arc-shaped airbag is used to reduce the water hammer effect when cooling water enters.

[0007] A further improvement of the technical solution of the present invention is that the upper mold is fixed on the movable mold plate of the injection molding machine, an upper cavity is set in the middle of the bottom surface of the upper mold, and an injection flow channel is coaxially opened through the movable mold plate and the upper cavity.

[0008] A further improvement of the technical solution of the present invention is that: an insulation water channel with an inverted L-shaped cross-section is arranged on the outer periphery of the upper cavity in the upper mold, and the two ends of the insulation water channel are respectively connected to an upper inlet channel and an upper outlet channel with a circular cross-section. The upper inlet channel and the upper outlet channel extend horizontally to the side wall of the upper mold, and a temperature control valve is threadedly connected at the outlet end of the upper outlet channel.

[0009] A further improvement of the technical solution of the present invention is that the vertical part of the insulation water channel is 8±0.2mm away from the outer surface of the upper cavity; the horizontal part of the inverted L-shaped insulation water channel is 3±0.1mm away from the top surface of the upper cavity.

[0010] A further improvement of the technical solution of the present invention is that: a lower cavity is recessed on the top surface of the lower mold, and multiple horizontal cooling channels are opened inside the lower mold below the lower cavity. The two ends of the cooling channels respectively pass through the two side walls of the lower mold, and the two ends of the cooling channels are respectively the lower inlet end and the lower outlet end, and a thread is set on the inner wall of the lower outlet end.

[0011] A further improvement of the technical solution of the present invention is that: an inlet groove connected to the lower inlet end is provided on the side wall of the lower mold, the diameter of the inlet groove is larger than the diameter of the lower inlet end, and a thread is provided on the inner wall of the inlet groove.

[0012] A further improvement of the technical solution of the present invention is that the cooling channel includes a circular channel, and an inverted trapezoidal mounting groove is opened on the top of the inner wall of the circular channel. The inverted trapezoidal mounting groove extends from the lower inlet end to the inside of the circular channel to 1 / 4~1 / 3 of the entire length of the circular channel, and the cross-sectional diameter of the circular channel decreases linearly from the lower inlet end to the lower outlet end, and the outlet end diameter is 2 / 3~3 / 4 of the inlet end diameter, which is used to gradually increase the cooling water flow rate, enhance heat exchange and reduce the end vortex.

[0013] A further improvement of the technical solution of the present invention is that: an inverted trapezoidal mounting strip is adapted to be inserted into the mounting groove, an integrally formed arc-shaped airbag sheet is provided on the bottom surface of the inverted trapezoidal mounting strip, and the top surface of the arc-shaped airbag sheet is abutted against the top inner wall of the circular channel; the radial height of the arc-shaped airbag sheet gradually increases along the direction of fluid flow, and is used to guide the fluid to flow axially along the circular channel.

[0014] A further improvement of the technical solution of the present invention is that: a square column is fixed on both sides of the bottom surface of the lower mold, and the bottom surface of the square column is fixedly connected to the top surface of the fixed mold plate; a push hole is opened in the middle of the fixed mold plate; a push plate is arranged between the two square columns, and a through stepped hole is opened at the four corners of the push plate; the upper end of the core shaft is fixed to the four corners of the bottom surface of the lower mold, and the lower end is penetrated by the corresponding stepped hole and locked by bolts, so that the push plate can slide up and down along the core shaft; a compression spring is sleeved on the outer periphery of each core shaft, the upper end of the compression spring abuts against the bottom surface of the push plate, and the lower end abuts against the top surface of the fixed mold plate, which is used to reset the push plate after the ejection action.

[0015] A further improvement of the technical solution of the present invention is that several push rods are set in the middle of the push plate, the push rods are adapted to pass through the lower mold upward, and the top surface of the push rods is flush with the bottom surface of the lower cavity in the mold closing state.

[0016] A further improvement of the technical solution of the present invention is that several push rods are set in the middle of the push plate, and the push rods are adapted to pass through the lower mold and the lower cavity insert upward. The top surface of the push rod is flush with the bottom surface of the lower cavity in the mold closing state.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects: The present invention provides an injection mold for a scooter body. An inverted L-shaped insulation channel is arranged around the periphery of the upper cavity and connected in a closed-loop manner to a temperature-controlled valve. This effectively solves the problem of poor melt flowability at the edge of the upper mold cavity, as discussed in the prior art. The inverted L-shaped channel, with its vertical section closely adhering to the outer cavity wall and its horizontal section close to the upper edge, provides a three-dimensional, cladding effect. During the injection molding process, heat is simultaneously supplied to the periphery and top surface of the body, forming a continuous, uniform temperature barrier. The temperature-controlled valve dynamically adjusts the flow rate and temperature of the high-temperature medium at 58°C ± 3°C based on real-time temperature feedback, ensuring that the edge melt temperature remains above the crystallization starting point, significantly reducing viscosity and extending the flow length by over 20%. This eliminates defects such as underfill (short shots), coarse weld marks, and surface rippling caused by premature solidification of the edge melt. The first-pass yield of the product has increased from 87% to 99%, structural strength has been improved by 12%, and the appearance gloss has been enhanced by one level. This improves the structural integrity, appearance quality, and overall yield of the scooter body.

[0018] The present invention provides an injection mold for a scooter body. The injection mold arranges an arc-shaped airbag sheet in a circular pipeline at the inlet section of the cooling channel, and utilizes its gradually increasing radial height to form a flexible buffer surface, thereby converting the instantaneous high-pressure wave generated by pulse cooling into a smooth push flow, thereby weakening the water hammer effect, avoiding pipeline vibration and noise, and at the same time ensuring the stability of the mold temperature field, thereby improving the dimensional accuracy and fatigue life of the body.

[0019] The present invention provides an injection mold for a scooter body. The injection mold realizes efficient and smooth demolding of large-area thin-walled scooter body products by disposing a push plate ejection mechanism composed of a square column, a fixed mold plate, a core shaft, a compression spring member and a push rod at the bottom of the lower mold. The core shaft is distributed at the four corners, with the upper end fixed to the bottom surface of the lower mold and the lower end passing through the mounting hole of the push plate and connected with bolts to form a precision guide; the compression spring member is sleeved on the outer periphery of each core shaft to ensure rapid and reliable reset. The push rod is arranged in an array in the middle of the push plate. In the closed mold state, the top surface is precisely flush with the bottom surface of the lower cavity to ensure that there is no top mark on the bottom surface of the product. After the mold is opened, the compression spring member releases the elastic force or the external ejection force drives the push plate to move smoothly upward along the core shaft. The push rod synchronously and evenly ejects the molded plate body, with balanced force and no deviation, effectively avoiding deformation, scratches or jamming of the thin-walled plate body during the demolding process, and significantly improving the demolding efficiency and product yield.

[0020] The present invention provides an injection mold for a scooter body. This injection mold uses a plug-in structure of an inverted trapezoidal mounting strip and an inverted trapezoidal mounting groove between the arc-shaped airbag piece and the circular pipeline, so that the arc-shaped airbag piece can be individually removed and replaced. When the arc-shaped airbag piece is fatigued and damaged due to long-term water hammer impact or chemical corrosion, there is no need to remove the mold or cut the pipeline. The inverted trapezoidal mounting strip can be quickly pulled out to complete the replacement of the new airbag piece by simply loosening the bolts, which greatly shortens maintenance time. The replaceable design not only avoids water hammer rebound and temperature fluctuations caused by airbag failure, but also reduces the maintenance cost of the mold throughout its life cycle, thereby continuously maintaining stable cooling of the cooling channel and product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0022] Figure 1 This is an overall schematic diagram of an injection mold for a scooter body; Figure 2 This is a schematic diagram of the rear-view stereoscopic structure of a scooter body injection mold; Figure 3It is a structural diagram of the movable platen and the upper die; Figure 4 It is a structural diagram of the movable platen, upper die and temperature control valve; Figure 5 is a cross-sectional view of the upper die; Figure 6 Schematic side view of the upper die; Figure 7 Schematic diagram of the structure of the lower mold; Figure 8 Cross-sectional view of the lower die; Figure 9 Side view of the lower die; Figure 10 Schematic diagram of the structure of the lower inlet end and the inlet groove; Figure 11 Schematic diagram of the structure of the arc-shaped airbag; Figure 12 Schematic diagram of the overall structure of the arc-shaped airbag Figure markings: 1. upper mold; 11. upper cavity; 12. insulation water channel; 103. temperature control valve; 2. lower mold; 21. lower cavity; 22. cooling channel; 27. arc-shaped airbag; 13. movable mold plate; 15. injection runner; 101. upper inlet channel; 102. upper outlet channel; 201. lower inlet end; 202. lower outlet end; 223. inlet groove; 2011. circular channel; 2014. inverted trapezoidal mounting groove; 271. inverted trapezoidal mounting strip; 272. arc-shaped airbag piece; 29. ​​square column; 23. fixed mold plate; 231. push hole; 232. push plate; 233. stepped hole; 234. core shaft; 235. compression spring; 28. push rod. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] The present invention will be further explained below with reference to specific embodiments.

[0027] like Figures 1-12 As shown, this embodiment provides a scooter body injection mold, The mold comprises an upper mold 1 and a lower mold 2. An upper cavity 11 is provided on the bottom surface of the upper mold 1. An inverted L-shaped insulation water channel 12 is provided within the upper mold 1, located on the periphery of the upper cavity 11. The insulation water channel 12 maintains circulating water at 58°C ± 3°C (provided by an external water temperature controller, which can use a 6KW to 9KW industrial water temperature controller. The water temperature controller is an existing device and will not be described here). The outlet of the insulation water channel 12 is connected to a temperature control valve 103. A lower cavity 21 is provided on the top surface of the lower mold 2. Multiple cooling channels 22 are provided within the lower mold 2, located below the lower cavity 21. The top of the inner wall of the inlet section of the cooling channel 22 is clamped with an arc-shaped airbag 27, which is used to reduce the water hammer effect when the cooling water enters. During operation, constant-temperature water at 58°C ± 3°C flows through the insulation channel 12, maintaining the surface of the upper cavity 11 at 58°C ± 3°C, slightly above the 58°C crystallization temperature of the PP scooter body. This significantly reduces viscosity fluctuations at the melt front, effectively minimizing weld lines and surface sink marks. When the temperature control valve 103 detects that the temperature at the outlet 101 of the insulation channel 12 exceeds 61°C, it activates an external water temperature controller (not shown) to adjust the water temperature back to the 58°C ± 3°C range within 30 seconds to prevent overheating and material decomposition. After melt filling is complete, cooling water at 15°C ± 1°C flows through the cooling channel 22. Water hammer impacts the curved airbag 27 at the inlet, causing it to elastically deform by 0.3-0.5mm. The gradually increasing radial height of the airbag guides the water flow along the wall, creating uniform turbulence, which reduces the surface temperature of the lower cavity 21 to below 45°C, achieving rapid finalization of the body and shortening the molding cycle. In summary, the mold ensures stable product dimensions and excellent surface quality through the synergistic effect of precise temperature control and efficient cooling, while effectively extending the mold life.

[0028] like Figure 3-Figure 6As shown, in this embodiment, the upper mold 1 is fixed to the movable platen 13 of the injection molding machine. An upper cavity 11 is located in the middle of the bottom surface of the upper mold 1. An injection runner 15 is coaxially extending through the movable platen 13 and the upper cavity 11 for center-feeding. An inverted L-shaped insulation channel 12 is located within the upper mold 1, located on the periphery of the upper cavity 11. The ends of the insulation channel 12 connect to an upper inlet channel 101 and an upper outlet channel 102, each with a circular cross-section. The upper inlet channel 101 and the upper outlet channel 102 extend horizontally to the sidewall of the upper mold 1. A temperature control valve 103 is threadedly connected to the outlet end of the upper outlet channel 102. The vertical part of the insulation water channel 12 is 8±0.2mm away from the outer surface of the upper cavity 11; the horizontal part of the inverted L-shaped insulation water channel 12 is 3±0.1mm away from the top surface of the upper cavity 11. Constant temperature water of 58℃±3℃ circulates in the inverted L-shaped insulation water channel 12. The vertical section suppresses the heat dissipation of the side wall and maintains the side wall temperature, and the horizontal section blocks the heat dissipation of the top surface and maintains the top surface temperature, forming a continuous temperature barrier, so that the edge melt temperature is always higher than the crystallization starting temperature, the viscosity is reduced, and the melt still maintains high fluidity at the end of filling, thereby reducing the short shot rate from 8% to 0.3%, increasing the weld mark strength by 12%, and basically eliminating the surface flow defects, which significantly improves the structural integrity and appearance yield of the plate body.

[0029] like Figure 7-12As shown, in this embodiment, the top surface of the lower mold 2 is recessed with a lower cavity 21. Multiple horizontal cooling channels 22 are provided within the lower mold 2, located below the lower cavity 21. The cooling channels 22 extend through the two side walls of the lower mold 2, with the lower inlet end 201 and the lower outlet end 202 at their ends. The inner wall of the lower outlet end 202 is threaded for external piping. The side walls of the lower mold 2 are provided with an inlet groove 223 that communicates with the lower inlet end 201. The diameter of the inlet groove 223 is larger than that of the lower inlet end 201, and the inner wall of the inlet groove 223 is threaded for connection to an external connector. When the external connector is tightened, its end flange strongly abuts against the bottom surface of the groove, achieving dual effects: first, sealing and preventing leakage: extrusion forms an end face seal to prevent coolant leakage; second, mechanical pre-tightening and fixing: transmitting axial pressure to the inverted trapezoidal mounting bar 271, locking it within the inverted trapezoidal mounting groove 2014. The cooling channel 22 consists of a circular channel 2011. A trapezoidal mounting groove 2014 is milled into the top of its inner wall, extending axially from the inlet end 201 to a point 1 / 4 to 1 / 3 of the length of the circular channel 2011. This groove serves as a guide for insertion, a position limiter, and provides a stable mechanical anchor for the airbag assembly. Furthermore, the cross-sectional diameter of the circular channel 2011 decreases linearly from the inlet end 201 to the outlet end 202, with the outlet diameter being only 2 / 3 to 3 / 4 of the inlet diameter, forming a tapered flow path. This tapered structure continuously accelerates the cooling water during flow, thinning the boundary layer and increasing the convective heat transfer coefficient by 25-30%. This steady increase in flow velocity avoids the vortices and dead zones that commonly occur at the end of conventional constant-diameter channels, significantly reducing flow noise and energy loss. An inverted trapezoidal mounting bar 271 is inserted into the inverted trapezoidal mounting groove 271, from whose bottom extends an integrally formed curved airbag panel 272. The top surface of the airbag sheet 272 fits tightly against the inner wall of the circular channel 2011, and its radial height gradually increases along the direction of fluid flow, forming a smooth flow-guiding slope. When pulsed cooling water suddenly rushes in, the water hammer causes the curved airbag sheet 272 to elastically deform downward by 0.3-0.5mm, rapidly absorbing the impact energy. The slope guides the water flow axially along the wall, suppressing vortices and localized low-pressure zones, and ensuring a uniform temperature field. The curved airbag sheet 272 is constructed from an EPDM-PU laminate (0.3mm thick). The EPDM layer provides excellent resistance to hot water, ozone, and chemical corrosion, while the PU layer provides high tear strength and elastic recovery. The airbag is pre-filled with dry nitrogen at 0.15-0.20MPa, enabling the required elastic deformation at a system pressure of 0.3-0.6MPa without excessively narrowing the channel cross-section. Measured flow loss is less than 5%.In summary, the combination of the tapered circular channel 2011 and the pluggable inverted trapezoidal mounting strip 271-arc-shaped airbag sheet 272 structurally realizes the four-in-one functions of "acceleration-flow diversion-shock absorption-flow equalization": the tapered section improves the heat exchange efficiency, the inverted trapezoidal groove realizes fast screw-free installation, and the composite airbag sheet suppresses water hammer and homogenizes the flow field, reducing the mold temperature fluctuation from ±1.5℃ to ±0.8℃, making the residual stress distribution more uniform, the three-point bending strength of the plate body increased by 15%, the fatigue life extended by more than 50%, and the maintenance time shortened by 70%, taking into account performance, reliability and economy.

[0030] like Figure 1-Figure 2 As shown, in this embodiment, a square column 29 is fixed on each side of the bottom surface of the lower mold 2, and the bottom surface of the square column 29 is fixedly connected to the top surface of the fixed mold plate 23; a push hole 231 is opened in the middle of the fixed mold plate 23; a push plate 232 is set between the two square columns 29, and the four corners of the push plate 232 have stepped holes 233 extending therethrough; the upper end of the mandrel 234 is fixed to the four corners of the bottom surface of the lower mold 2, and the lower end is penetrated by corresponding stepped holes 233 and locked by bolts, so that the push plate 232 can slide up and down along the mandrel 234; each mandrel 234 is sheathed with a compression spring 235, the upper end of the compression spring 235 abuts the bottom surface of the push plate 232 and the lower end abuts the top surface of the fixed mold plate 23, which is used to reset the push plate 232 after ejection. A plurality of push rods 28 are set in the middle of the push plate 232, which are adapted to pass through the lower mold 2 upward. When the mold is closed, the top surface of the push rod 28 is flush with the bottom surface of the lower cavity 21.

[0031] The present invention also provides a scooter body injection mold operating principle: 1. Preheating stage; during use, the upper mold 1 is fixed to the movable injection mold plate 13 and closed with the lower mold 2. The molten plastic is injected into the cavity formed by the upper cavity 11 and the lower cavity 21 through the injection runner 15 that penetrates the movable injection mold plate 13 and the upper mold 1. 58°C ± 3°C constant temperature water enters the inverted L-shaped insulation water channel 12 through the upper inlet channel 101, forming a continuous temperature barrier to maintain melt fluidity. If the temperature control valve 103 detects that the outlet temperature exceeds 61°C, the external water temperature controller is activated to adjust the temperature back within 30 seconds to ensure stable viscosity at the PP melt front and reduce weld lines and sink marks. The temperature control valve 103 controls the flow of constant temperature water into the insulation water channel 12, stabilizing the peripheral temperature of the cavity, significantly reducing weld marks, warping and shrinkage, and improving surface gloss. After melt filling is completed, 15°C ± 1°C cooling water is injected into the inlet groove 223. The water flow impacts the arc-shaped airbag sheet 272 (pre-filled with 0.15-0.20 MPa nitrogen), causing it to elastically deform by 0.3-0.5 mm to absorb the kinetic energy of water hammer. The airbag's gradually changing guide slope guides the water flow axially along the wall, while accelerating it in the cooling channel 22 with a linearly decreasing cross-section (outlet diameter = inlet × 2 / 3-3 / 4). The boundary layer is thinned, improving the heat exchange efficiency by 25-30%, and rapidly reducing the surface temperature of the lower cavity 21 to below 45°C. After the product solidifies, the ejector pin of the injection molding machine passes through the ejection hole 231 and pushes the ejector plate 232 upward smoothly along the core shaft 234. The compression spring 235 is compressed, and the ejector pin 28 simultaneously ejects the finished product from the lower cavity 21 without damage. Then the spring 235 resets and drives the ejector plate 232 to return to its original position quickly, realizing a continuous, low-noise, high-precision automated production cycle and extending the mold life by more than 20%.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scooter body injection mold, characterized in that: The invention comprises an upper mold (1) and a lower mold (2), wherein an upper mold cavity (11) is provided on the bottom surface of the upper mold (1), a heat preservation water channel (12) with an inverted L-shaped cross section is provided in the upper mold (1) and located on the periphery of the upper mold cavity (11), and the outlet of the heat preservation water channel (12) is connected to a temperature control valve (103); a lower mold cavity (21) is provided on the top surface of the lower mold (2), and a plurality of cooling channels (22) are provided in the lower mold (22) and located below the lower mold cavity (21), and an arc-shaped air bag (27) is clamped on the top of the inner wall of the inlet section of the cooling channel (22), and the arc-shaped air bag (27) is used to reduce the water hammer effect when cooling water enters.

2. The scooter body injection mold according to claim 1, characterized in that: The upper mold (1) is fixed on a movable mold plate (13) of an injection molding machine. An upper mold cavity (11) is provided in the middle of the bottom surface of the upper mold (1). The movable mold plate (13) and the upper mold cavity (11) are coaxially provided with an injection molding flow channel (15) penetrating therethrough.

3. The scooter body injection mold according to claim 2, characterized in that: A heat-insulating water channel (12) with an inverted L-shaped cross section is provided on the outer periphery of the upper cavity (11) in the upper mold (1). The two ends of the heat-insulating water channel (12) are respectively connected to an upper inlet channel (101) and an upper outlet channel (102) with a circular cross section. The upper inlet channel (101) and the upper outlet channel (102) extend horizontally to the side wall of the upper mold (1). The outlet end of the upper outlet channel (102) is threadedly connected to a temperature control valve (103).

4. The scooter body injection mold according to claim 3, characterized in that: The vertical portion of the heat-insulating water channel (12) is 8±0.2 mm away from the outer surface of the upper cavity (11); and the horizontal portion of the inverted L-shaped heat-insulating water channel (12) is 3±0.1 mm away from the top surface of the upper cavity (11).

5. The scooter body injection mold according to claim 2, characterized in that: A lower cavity (21) is concavely provided on the top surface of the lower mold (2), and a plurality of horizontal cooling channels (22) are provided inside the lower mold (2) below the lower cavity (21), with both ends of the cooling channels (22) respectively penetrating the two side walls of the lower mold (2), and the two ends of the cooling channels (22) are respectively a lower inlet end (201) and a lower outlet end (202), and a thread is provided on the inner wall of the lower outlet end (202).

6. The scooter body injection mold according to claim 5, characterized in that: The side wall of the lower mold (2) is provided with an inlet groove (223) communicating with the lower inlet end (201), the diameter of the inlet groove (223) is larger than the diameter of the lower inlet end (201), and the inner wall of the inlet groove (223) is provided with a thread.

7. The scooter body injection mold according to claim 6, characterized in that: The cooling channel (22) comprises a circular channel (2011), an inverted trapezoidal mounting groove (2014) is provided at the top of the inner wall of the circular channel (2011), the inverted trapezoidal mounting groove (2014) extends from the lower inlet end (201) to the inside of the circular channel (2011) to 1 / 4 to 1 / 3 of the length of the entire circular channel (2011), and the cross-sectional diameter of the circular channel (2011) decreases linearly from the lower inlet end (201) to the lower outlet end (202), and the outlet end diameter is 2 / 3 to 3 / 4 of the inlet end diameter, so as to gradually increase the cooling water flow rate, enhance heat exchange and reduce terminal vortex.

8. The scooter body injection mold according to claim 6, characterized in that: An inverted trapezoidal mounting strip (271) is adapted to be inserted into the mounting groove (2014), and an integrally formed arc-shaped airbag sheet (272) is provided on the bottom surface of the inverted trapezoidal mounting strip (271), and the top surface of the arc-shaped airbag sheet (272) is in contact with the top inner wall of the circular channel (2011); the radial height of the arc-shaped airbag sheet (272) gradually increases along the direction of fluid flow, and is used to guide the fluid to flow axially along the circular channel (2011).

9. The scooter body injection mold according to claim 1, characterized in that: A square column (29) is fixed on both sides of the bottom surface of the lower mold (2), and the bottom surface of the square column (29) is fixedly connected to the top surface of the fixed mold plate (23); a push hole (231) is opened in the middle of the fixed mold plate (23); a push plate (232) is arranged between the two square columns (29), and stepped holes (233) are opened at the four corners of the push plate (232); the upper end of the core shaft (234) is fixed to the four corners of the bottom surface of the lower mold (2), and the lower end is penetrated by the corresponding stepped holes (233) and is locked by bolts so that the push plate (232) can slide up and down along the core shaft (234); a compression spring (235) is sleeved on the outer periphery of each core shaft (234), the upper end of the compression spring (235) abuts against the bottom surface of the push plate (232), and the lower end abuts against the top surface of the fixed mold plate (23), so as to reset the push plate (232) after the ejection action.

10. The scooter body injection mold according to claim 9, characterized in that: A plurality of push rods (28) are arranged in the middle of the push plate (232). The push rods (28) are adapted to pass through the lower mold (2) upwards. The top surfaces of the push rods (28) are flush with the bottom surface of the lower cavity (21) in the mold closing state.

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