A rapid heating mechanism for a plastic mold for an automobile sensor

Abstract

The utility model relates to the technical field of plastic mould heating, specifically relates to a kind of quick heating mechanism of plastic mould for automobile sensor, including base, the top four corners of base are uniformly fixedly connected with support rod, and the top between four support rods is fixedly connected with mounting plate, and the top of mounting plate is fixedly connected with cylinder, and the output end of cylinder is through the bottom of mounting plate and is fixedly connected with upper mould, and upper mould is slidably connected between the outer wall of four support rods, and the top of base is fixedly connected with lower mould, recess is set up in the two sides of lower mould, and the two sides of lower mould are provided with the ejection mechanism for ejecting the sensor shell shaped after forming in lower mould model cavity. Compared with prior art, the whole demoulding and discharging process of the present application does not need manual intervention, significantly improves the mould use safety and injection molding production efficiency, has good automation level and industrial application value.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold heating technology, and in particular to a rapid heating mechanism for plastic molds used in automotive sensors. Background Technology

[0002] With the continuous development of automotive electronics technology, various automotive sensors (such as temperature sensors, pressure sensors, and position sensors) are widely used in engine control systems, body control systems, safety systems, and driver assistance systems. These sensors typically need to be encapsulated in plastic housings with certain accuracy and strength requirements to ensure their electrical performance and environmental adaptability. Therefore, in the sensor manufacturing process, the quality and molding efficiency of the plastic mold directly affect the stability and production efficiency of the sensor.

[0003] A Chinese patent has been published: a heating mechanism for a plastic mold, patent announcement number: CN219855653. The patent "includes a support frame, a lower mold body is fixedly connected to the support frame, a heat-conducting plate is fixedly connected to the lower mold body, a heating tube is slidably connected to the lower mold body, a heat-conducting component is fixedly connected to the heat-conducting plate and contacts the heating tube, a magnetic sheet is fixedly connected to the lower mold body, and a heat insulation plate is fixedly connected to the heating tube."

[0004] While existing molds can limit the movement of the moving plate through mechanisms such as positioning holes, positioning balls, and springs, thus enabling precise control of the upper mold body, the mold cavity or product shell remains at a high temperature after injection molding. Furthermore, the mold lacks an automatic demolding or unloading mechanism, requiring manual removal of the molded parts. This poses a significant safety hazard, as operators are highly susceptible to burns during removal. Moreover, manual removal is slow and cannot meet the demands of high-speed production, leading to low production efficiency. Therefore, equipping the molds with automated demolding and unloading mechanisms to avoid the safety risks and quality issues associated with manual operation at high temperatures is a critical technical problem that urgently needs to be addressed. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a rapid heating mechanism for plastic molds used in automotive sensors, so as to solve the problem that the mold is not equipped with an automatic demolding or unloading structure, and the molded parts need to be removed manually, which poses a safety risk such as burns to the operator when removing the parts.

[0006] Based on the above objectives, this utility model provides a rapid heating mechanism for a plastic mold used in automotive sensors, including a base. Support rods are fixedly connected to the four corners of the top of the base. A mounting plate is fixedly connected between the tops of the four support rods. A cylinder is fixedly connected to the top of the mounting plate. The output end of the cylinder passes through the bottom of the mounting plate and is fixedly connected to an upper mold. The upper mold is slidably connected between the outer walls of the four support rods. A lower mold is fixedly connected to the top of the base. Grooves are provided on both sides of the lower mold. Ejection mechanisms are provided on both sides of the lower mold for ejecting the formed sensor housing from the lower mold cavity. A pushing mechanism is provided between the upper and lower molds for the ejection mechanism to eject the housing and then push it out above the lower mold. A heating mechanism is provided inside the lower mold for heating the mold cavity.

[0007] Preferably, the ejection mechanism includes two ejector rods passing through the inner wall of the lower mold and the inner walls of the two grooves. The outer walls of the two ejector rods are fitted with first springs. The top end of the first spring is fixedly connected to the top of the inner wall of the groove, and the bottom end of the first spring is fixedly connected to the bottom end of the ejector rod. The bottom end of the ejector rod is arc-shaped. The top of the ejector rod is fixedly connected to a top plate for pushing material, and the bottom of the top plate is in contact with the inner wall of the top cavity of the lower mold.

[0008] Preferably, the top of the base is fixedly connected to slide rails on both sides near the lower mold, the top of each of the two slide rails is slidably connected to a first ramp block, the top of the first ramp block is fixedly connected to a second ramp block, the top of the base is fixedly connected to a fixing plate on both sides, the side walls of the two fixing plates are provided with slide rods, the outer wall of the slide rods is fitted with a second spring, the two ends of the second spring are respectively fixedly connected to the side walls of the first ramp block and the fixing plate, and the bottom of the upper mold is fixedly connected to a lower pressure rod for pushing the second ramp block on both sides, the bottom of the lower pressure rod is arc-shaped.

[0009] Preferably, the pushing mechanism includes two cross links rotatably connected between the upper mold and the lower mold. Two connecting rods are rotatably connected between the two ends of the two cross links away from the lower mold. Push rods are rotatably connected to the middle rotating shafts of the two two connecting rods. Slide grooves are provided on the side walls of the two push rods. The middle rotating shafts of the two cross links pass through the interior of the slide grooves. A push plate is fixedly connected between the ends of the two push rods near the lower mold.

[0010] Preferably, the heating mechanism includes a heating rod fixedly connected to the side wall of the lower mold near the perimeter of the mold cavity, and high thermal conductivity graphite is provided inside the lower mold near the perimeter of the mold cavity.

[0011] Preferably, the top of the upper mold is connected to a feeding pipe for injecting plastic into the mold cavity of the lower mold and the upper mold, and the top end of the feeding pipe penetrates the top of the mounting plate.

[0012] Preferably, the outer walls of the four support rods are fitted with buffer springs, and the bottom of the buffer springs is fixedly connected to the top of the base.

[0013] Preferably, the side wall of the lower mold is fixedly connected to a feeding slant plate for feeding.

[0014] Preferably, when the second spring pushes the first ramp block, the first ramp block slides to one side of the push rod and squeezes the bottom end of the push rod. When the arc-shaped structure at the bottom end of the push rod contacts the top end of the first ramp block, the push rod will move to the top of the lower mold and push out the outer shell of the mold cavity inside the lower mold through the top plate.

[0015] Preferably, when the bottom end of the pressure rod moves to the side wall of the second ramp block, it will squeeze the side wall of the second ramp block. The compression of the second ramp block will cause it to release the resistance to the top rod. The top rod, which is not resisted by the first ramp block, will cause the top plate to move downward.

[0016] The beneficial effects of this utility model are: 1. This rapid heating mechanism for automotive sensor plastic molds solves the problems of traditional injection molds, such as the need for manual removal after molding, the risk of burns from high temperatures, and low production efficiency, by setting up an ejector mechanism and a pusher mechanism. Specifically, after the cylinder drives the upper mold and lower mold to fit together to form a sealed mold cavity, plastic raw material is poured in through the feeding pipe. The heating rod and high thermal conductivity graphite inside the lower mold heat and melt the raw material in the mold cavity. After molding, the lower pressure rod, in conjunction with the second ramp block, the first ramp block, the ejector rod, and the top plate, automatically ejects the product. At the same time, the rise of the upper mold also drives the movement of the cross linkage, the double linkage, and the pusher rod. The pusher plate pushes the ejected shell along the mold surface to the unloading ramp, where it slides down and finally falls into the end collection container. The entire demolding and unloading process requires no manual intervention, significantly improving the safety of mold use and the efficiency of injection molding production, and has a good level of automation and industrial application value.

[0017] 2. This rapid heating mechanism for automotive sensor plastic molds uses heating rods placed inside the lower mold near the perimeter of the mold cavity, surrounded by highly thermally conductive graphite. The excellent thermal conductivity of graphite rapidly and evenly conducts the heat generated by the heating rods to the entire inner wall of the mold cavity, effectively preventing localized overheating or excessive temperature differences. This significantly improves the thermal stability of the mold, ensuring more uniform heating of the plastic raw material during molding. It also helps improve the structural consistency and appearance quality of the molded shell, reduces defect rates, and increases product qualification rate and production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall rear-view three-dimensional structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of the lower mold of this utility model; Figure 4 This is a three-dimensional structural diagram of the top rod and top plate of this utility model; Figure 5 This is a schematic diagram of the first ramp block and its three-dimensional structure according to the present invention; Figure 6 This is a three-dimensional structural diagram of the material pushing mechanism of this utility model.

[0020] The diagram is marked as follows: 1. Base; 2. Support rod; 3. Mounting plate; 4. Cylinder; 5. Upper mold; 6. Lower mold; 7. Groove; 8. Push rod; 9. First spring; 10. Top plate; 11. Slide rail; 12. First ramp block; 13. Second ramp block; 14. Fixing plate; 15. Slide rod; 16. Second spring; 17. Down pressure rod; 18. Cross linkage; 19. Double linkage; 20. Push rod; 21. Slide groove; 22. Push plate; 23. Heating rod; 24. High thermal conductivity graphite; 25. Feeding pipe; 26. Buffer spring; 27. Discharge ramp. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" 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.

[0023] like Figures 1 to 6 As shown, a rapid heating mechanism for a plastic mold used in automotive sensors includes a base 1. Support rods 2 are fixedly connected to the four corners of the top of the base 1. A mounting plate 3 is fixedly connected between the tops of the four support rods 2. A cylinder 4 is fixedly connected to the top of the mounting plate 3. The output end of the cylinder 4 passes through the bottom of the mounting plate 3 and is fixedly connected to an upper mold 5. The upper mold 5 is slidably connected between the outer walls of the four support rods 2. A lower mold 6 is fixedly connected to the top of the base 1. A feeding pipe 25 for injecting plastic into the mold cavities of the lower mold 6 and the upper mold 5 is connected to the top of the upper mold 5. The top end of the feeding pipe 25 passes through the top of the mounting plate 3. Grooves 7 are provided on both sides of the lower mold 6. Ejection mechanisms are provided on both sides of the lower mold 6 for ejecting the formed sensor housing from the mold cavity of the lower mold 6. A pushing mechanism is provided between the upper mold 5 and the lower mold 6 for ejecting the housing and then pushing it out above the lower mold 6. A heating mechanism for heating the mold cavity is provided inside the lower mold 6.

[0024] Further, see attached document. Figures 1 to 6As shown, the ejection mechanism includes two ejector rods 8 passing through the inner wall of the lower mold 6 and the inner walls of the two grooves 7. A first spring 9 is fitted onto the outer wall of each ejector rod 8. The top end of the first spring 9 is fixedly connected to the top of the inner wall of the groove 7, and the bottom end of the first spring 9 is fixedly connected to the bottom end of the ejector rod 8. The bottom end of the ejector rod 8 is arc-shaped. A top plate 10 for pushing material is fixedly connected to the top of the ejector rod 8. The bottom of the top plate 10 is in contact with the inner wall of the mold cavity at the top of the lower mold 6. Slide rails 11 are fixedly connected to the top of the base 1 on both sides near the lower mold 6. A first ramp block 12 is slidably connected to the top of each of the two slide rails 11. A second ramp block 13 is fixedly connected to the top of the first ramp block 12. Fixing plates 14 are fixedly connected to the top of the base 1 on both sides. Slide rods 15 pass through the side walls of the two fixing plates 14. A second spring 16 is fitted onto the outer wall of the slide rod 15. The two ends of the second spring 16 are respectively fixedly connected to the first spring 13. On the side walls of the ramp block 12 and the fixed plate 14, when the second spring 16 pushes the first ramp block 12, the first ramp block 12 slides towards the side of the push rod 8 and presses the bottom end of the push rod 8. When the arc-shaped structure at the bottom end of the push rod 8 contacts the top end of the first ramp block 12, the push rod 8 will move to the top of the lower mold 6 and push out the outer shell of the inner mold cavity of the lower mold 6 through the top plate 10. The bottom sides of the upper mold 5 are fixedly connected with the lower pressure rod 17 for pushing the second ramp block 13. The bottom shape of the lower pressure rod 17 is arc-shaped. When the bottom end of the lower pressure rod 17 moves to the side wall of the second ramp block 13, it will press the side wall of the second ramp block 13. The second ramp block 13 being pressed will cause it to release the resistance to the push rod 8. The push rod 8, which is not resisted by the first ramp block 12, will cause the top plate 10 to move downward, so as to prevent the top plate 10 from moving upward when adding material into the mold cavity of the upper mold 5 and the lower mold 6, and keep it in the state of pushing material. The pushing mechanism includes two cross rods 18 rotatably connected between the upper mold 5 and the lower mold 6. Two connecting rods 19 are rotatably connected between the two ends of the two cross rods 18 away from the lower mold 6. Push rods 20 are rotatably connected to the middle rotating shaft of the two two connecting rods 19. Slide grooves 21 are opened on the side walls of the two push rods 20. The middle rotating shaft of the two cross rods 18 passes through the interior of the slide grooves 21. Push plate 22 is fixedly connected between the ends of the two push rods 20 near the lower mold 6. When the ejection mechanism is in use, the cylinder 4 is first activated, which drives the upper mold 5 to move downward and fit tightly against the top of the lower mold 6 to form a closed mold cavity. After the fitting is completed, the material is connected to the external feeding equipment through the feeding pipe 25 on the upper mold 5 to inject plastic raw materials into the mold cavity formed by the upper mold 5 and the lower mold 6. During the feeding process, the lower pressure rod 17 moves down with the upper mold 5 and presses the second ramp block 13 set on one side of the lower mold 6. Under the force, the second ramp block 13 drives the first ramp block 12 to slide towards the fixed plate 14, while compressing the second spring 16 set on one side. As the first ramp block 12 moves, its top gradually separates from the bottom of the push rod 8. The first spring 9 releases its elastic force to push the push rod 8 down. The push rod 8 then drives the top plate 10 to move down, so that the top plate 10 fits against the inner wall of the mold cavity. Subsequently, the plastic raw material injected into the mold cavity is heated and melted by the heating mechanism set inside the mold, so that it is quickly molded in the limited structure. After molding is completed, cylinder 4 is restarted to move the upper mold 5 and lower pressure rod 17 upward. At this time, the lower pressure rod 17 gradually releases pressure on the second ramp block 13, the second spring 16 releases its elastic force, and moves the first ramp block 12 back to its initial position on the slide rail 11, and presses the push rod 8 upward again. During the compression process, the push rod 8 compresses the first spring 9 and moves the top plate 10 upward, thereby pushing out the molded shell located in the top mold cavity of the lower mold 6. Simultaneously, in coordination with the action of the pushing mechanism, as the upper mold 5 rises, the cross link 18 and the double link 19 connected to it fold synchronously and move closer to the side of the lower mold 6. The double link 19 further drives the push rod 20 to move to the top of the lower mold 6. During the pushing process of the push rod 20, the connected push plate 22 pushes the ejected molded shell along the mold surface and finally pushes it to the unloading inclined plate 27 set on one side of the mold. The molded shell slides down through the unloading inclined plate 27. A storage container can be placed through one end of the unloading inclined plate 27 and finally falls into the storage container set at its end, realizing automatic unloading. This invention solves the problems of traditional injection molds, which still require manual removal after molding, posing a risk of burns from high temperatures and resulting in low production efficiency, by setting up an automatic demolding and unloading structure. Specifically, after the cylinder 4 drives the upper mold 5 and lower mold 6 to fit together to form a sealed mold cavity, plastic raw material is injected through the feeding pipe 25. The heating rod 23 and high thermal conductivity graphite 24 located inside the lower mold 6 heat and melt the raw material in the mold cavity to form the mold. After molding, the lower pressure rod 17, in conjunction with the second ramp block 13, the first ramp block 12, the ejector rod 8, and the top plate 10, automatically ejects the product. At the same time, the rise of the upper mold 5 also drives the movement of the cross linkage 18, the double linkage 19, and the push rod 20. The push plate 22 pushes the ejected shell along the mold surface to the unloading ramp 27, where it slides down and finally falls into the end collection container. The entire demolding and unloading process requires no manual intervention, significantly improving the safety of mold use and the efficiency of injection molding production, and has a good level of automation and industrial application value.

[0025] Further, see attached document. Figure 4As shown, the heating mechanism includes heating rods 23 fixedly connected to the inner wall of the lower mold 6 near the perimeter of the mold cavity. High thermal conductivity graphite 24 is provided inside the lower mold 6 near the perimeter of the mold cavity. This allows the excellent thermal conductivity of graphite to quickly and evenly conduct heat to the entire inner wall of the mold cavity, thereby effectively avoiding local overheating or uneven temperature distribution, improving the thermal stability of the mold forming and the consistency of the product, and ensuring that the plastic shell is heated evenly and has more stable quality.

[0026] Further, see attached document. Figure 1 As shown, the outer walls of the four support rods 2 are all fitted with buffer springs 26. The bottom of the buffer springs 26 is fixedly connected to the top of the base 1. They can provide elastic buffer resistance when the upper mold 5 is lowered and fitted, reduce the impact force, avoid damage to the mold caused by rigid contact, improve the smoothness and safety of the fitting action, and extend the overall service life of the mold.

[0027] Further, see attached document. Figure 2 As shown, the side wall of the lower mold 6 is fixedly connected to a feeding sloping plate 27 for feeding, which guides the material pushed down by the feeding mechanism into the receiving container.

[0028] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0029] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rapid heating mechanism for a plastic mold used in automotive sensors, comprising a base (1), characterized in that: The base (1) has four support rods (2) fixedly connected to the top of each of the four support rods (2). An installation plate (3) is fixedly connected between the tops of the four support rods (2). A cylinder (4) is fixedly connected to the top of the installation plate (3). The output end of the cylinder (4) passes through the bottom of the installation plate (3) and is fixedly connected to an upper mold (5). The upper mold (5) is slidably connected between the outer walls of the four support rods (2). A lower mold (6) is fixedly connected to the top of the base (1). Grooves (7) are provided on both sides of the lower mold (6). An ejection mechanism is provided on both sides of the lower mold (6) for ejecting the sensor shell formed in the mold cavity of the lower mold (6). A pushing mechanism is provided between the upper mold (5) and the lower mold (6) for ejecting the shell and then pushing the shell out above the lower mold (6). A heating mechanism is provided inside the lower mold (6) for heating the mold cavity.

2. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 1, characterized in that, The ejection mechanism includes two ejector rods (8) that pass through the inner wall of the lower mold (6) and the inner walls of the two grooves (7). The outer walls of the two ejector rods (8) are fitted with first springs (9). The top end of the first spring (9) is fixedly connected to the top of the inner wall of the groove (7), and the bottom end of the first spring (9) is fixedly connected to the bottom end of the ejector rod (8). The bottom end of the ejector rod (8) is arc-shaped. The top of the ejector rod (8) is fixedly connected to a top plate (10) for pushing the material. The bottom of the top plate (10) is in contact with the inner wall of the top mold cavity of the lower mold (6).

3. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 2, characterized in that, The top of the base (1) is fixedly connected to slide rails (11) on both sides near the lower mold (6). The top of the two slide rails (11) is slidably connected to a first ramp block (12). The top of the first ramp block (12) is fixedly connected to a second ramp block (13). The top of the base (1) is fixedly connected to both sides of the base. The side walls of the two fixed plates (14) are provided with slide rods (15). The outer wall of the slide rod (15) is fitted with a second spring (16). The two ends of the second spring (16) are fixedly connected to the side walls of the first ramp block (12) and the fixed plate (14) respectively. The bottom sides of the upper mold (5) are fixedly connected to a lower pressure rod (17) for pushing the second ramp block (13). The bottom of the lower pressure rod (17) is arc-shaped.

4. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 3, characterized in that, The pushing mechanism includes two cross links (18) rotatably connected between the upper mold (5) and the lower mold (6). Two connecting rods (19) are rotatably connected between the two ends of the two cross links (18) away from the lower mold (6). Push rods (20) are rotatably connected to the middle rotating shafts of the two connecting rods (19). Slide grooves (21) are opened on the side walls of the two push rods (20). The middle rotating shafts of the two cross links (18) pass through the interior of the slide grooves (21). A push plate (22) is fixedly connected between the ends of the two push rods (20) near the lower mold (6).

5. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 1, characterized in that, The heating mechanism includes a heating rod (23) fixedly connected inside the lower mold (6) near the side wall of the mold cavity. High thermal conductivity graphite (24) is provided inside the lower mold (6) near the mold cavity.

6. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 1, characterized in that, The top of the upper mold (5) is connected to a feeding tube (25) for injecting plastic into the mold cavity of the lower mold (6) and the upper mold (5), and the top end of the feeding tube (25) penetrates the top of the mounting plate (3).

7. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 1, characterized in that, The outer walls of the four support rods (2) are fitted with buffer springs (26), and the bottom of the buffer springs (26) is fixedly connected to the top of the base (1).

8. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 1, characterized in that, The lower mold (6) has a feeding sloping plate (27) fixedly connected to its side wall for feeding.

9. The rapid heating mechanism for a plastic mold for an automotive sensor according to claim 3, characterized in that, When the second spring (16) pushes the first ramp block (12), the first ramp block (12) slides to one side of the push rod (8) and squeezes the bottom end of the push rod (8). When the arc-shaped structure at the bottom end of the push rod (8) contacts the top end of the first ramp block (12), the push rod (8) will move to the top of the lower mold (6) and push out the outer shell of the inner mold cavity of the lower mold (6) through the top plate (10).

10. A rapid heating mechanism for a plastic mold for an automotive sensor according to claim 3, characterized in that, When the bottom end of the pressure rod (17) moves to the side wall of the second ramp block (13), it will squeeze the side wall of the second ramp block (13). The second ramp block (13) being squeezed will cause the resistance to the top rod (8) to be released. The top rod (8) not being resisted by the first ramp block (12) will cause the top plate (10) to move downward.

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