A lamp base shell injection mold

Abstract

This utility model discloses an injection mold for a lamp base shell. A first slider and a second slider are mounted on the moving mold platen. A spring pin is elastically mounted on the first slider. In the closed state, the spring pin is inserted under the pressure of the fixed mold platen to form a through-hole structure. When the mold opens, the spring pin automatically retracts after losing the pressure of the fixed mold platen, thus removing the through-hole. Subsequently, the first and second sliders move in opposite directions to complete the demolding of the connecting edge with the through-hole. This utility model provides an injection mold for a lamp base shell that utilizes the pressure of the fixed mold platen to form the spring pin, and automatically retracts it during mold opening due to elastic force. Combined with the coordinated separation movement of the first and second sliders, it achieves smooth demolding of the through-hole and connecting edge, avoiding part deformation and jamming, significantly simplifying the mold structure and improving part precision.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to an injection mold for a lamp base shell. Background Technology

[0002] like Figure 1 As shown, existing lamp base shells are typically manufactured using injection molding, and their outer periphery has outwardly extending connecting edges for connection and fixation to other components via screws or clips. To improve the structural strength of the lamp base shell, through holes are usually provided on the connecting edges, and reinforcing ribs are provided around the through holes to enhance the rigidity and deformation resistance of the edge area.

[0003] However, during injection molding, the presence of both through holes and reinforcing ribs on the connecting edge can easily lead to interference between the plastic part and the core during mold opening and demolding, causing problems such as part deformation, tearing, or through hole deformation. To achieve smooth demolding of the perforated structure, existing molds typically require complex slider core-pulling mechanisms. However, these mechanisms have limited travel and a compact layout, making them prone to slider jamming or incomplete demolding after prolonged use. Therefore, existing lamp base shell molds still suffer from problems such as difficult demolding, complex structure, and maintenance difficulties when molding connecting edges with through holes. Summary of the Invention

[0004] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, the embodiments of this utility model propose an injection mold for lamp base shells, which uses a fixed template to press and form spring needles, and automatically retracts them by elastic force when the mold is opened. Combined with the coordinated separation movement of the first slider and the second slider, smooth demolding of through holes and connecting edges is achieved, avoiding deformation and jamming of the parts, significantly simplifying the mold structure and improving the precision of the parts.

[0005] The technical solution adopted by this utility model is as follows: A lamp base shell injection mold is provided, including a moving mold plate and a fixed mold plate. A first slider and a second slider are installed on the moving mold plate, and a spring pin is elastically installed on the first slider. In the mold-closed state, the spring pin is inserted into the part under the pressure of the fixed mold plate to form a through-hole structure; when the mold is opened, the spring pin automatically retracts under the action of elastic force after losing the pressure of the fixed mold plate, realizing the extraction of the through-hole. Subsequently, the first slider and the second slider move in a direction away from each other, thereby completing the demolding of the part with the through-hole connecting edge.

[0006] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting a spring pin that is elastically installed on the first slider, the through hole is formed by the top pressure of the fixed platen in the mold closing state. When the mold is opened, the spring pin is automatically retracted by the elastic force. No additional core-pulling cylinder or linkage mechanism is required, which realizes the automatic extraction and smooth demolding of the through hole part, and significantly simplifies the mold structure.

[0007] 2. The extension and retraction of the spring pin is smoothly driven by elastic force. Compared with the rigid core-pulling structure, it can effectively avoid excessive peeling force on the edge of the through hole of the workpiece, thereby reducing through hole deformation, burrs and scratches, and ensuring the appearance and dimensional accuracy of the finished product.

[0008] 3. By moving the first and second sliders in opposite directions, a coordinated demolding motion path is formed, allowing the connecting edge to have sufficient space to release during the mold opening stage, thus improving the smoothness of demolding.

[0009] 4. The coordinated movement of the spring pin and the slider keeps the through-hole structure under control during the molding and demolding process, avoiding the offset or jamming problems caused by traditional mechanical core pulling, ensuring smooth edges and stable dimensions of the through hole, thereby improving the overall appearance and assembly accuracy of the part.

[0010] Furthermore, the first slider is provided with an oblique guide hole, and the fixed mold plate is provided with an oblique guide post at the position corresponding to the oblique guide hole. During mold closing, the oblique guide post is inserted into the oblique guide hole to form a sliding fit; as the moving mold plate moves, the oblique guide post drives the first slider to move obliquely, thereby achieving precise guidance of the slider. This oblique guide structure can be used to drive the first slider to move synchronously during mold closing and opening, and can also prevent the slider from deviating during lateral movement, improving the stability and repeatability of the overall mold movement.

[0011] Furthermore, the second slider is connected to a hydraulic cylinder, which drives the second slider to reciprocate along the guide direction. During the mold opening stage, the hydraulic cylinder extends and moves the second slider away from the first slider, thereby providing sufficient demolding space for the part; during the mold closing stage, the hydraulic cylinder retracts, and the second slider returns to the forming position, realizing the re-closing and forming of the part's shape.

[0012] Furthermore, the moving template is equipped with a guide rail, on which the second slider is slidably supported. The guide rail is used to limit the movement direction of the second slider and bear its motion load, allowing the slider to move smoothly along a predetermined path. This structure not only improves the guiding accuracy of the slider but also effectively reduces motion friction, thereby increasing the service life and operational reliability of the sliding mechanism.

[0013] Furthermore, the spring pin includes a pin cap and an insert pin, with one end of the insert pin fixedly connected to one end of the pin cap, forming an integrated force transmission structure. During mold closing, the other end of the pin cap abuts against the fixed mold plate, which applies a clamping force to the pin cap, causing the insert pin to insert into the part cavity to form a through hole. When the mold opens, the fixed mold plate moves away from the moving mold plate, and the pin cap, freed from its top pressure constraint, moves outward under the action of the elastic element, thereby causing the insert pin to disengage from the through hole, achieving automatic pin removal. This structure can complete the automatic demolding action of the through hole without the need for an independent drive mechanism.

[0014] Furthermore, the first slider has a stepped mounting hole. The pin cap slides into the larger hole within the mounting hole, and the insert pin slides into the smaller hole within the mounting hole. This stepped hole structure not only enables coaxial guidance of the pin cap and the insert pin but also creates a limiting effect within the mounting space, ensuring the spring pin maintains a stable posture during reciprocating motion and preventing pin wobbling or deviation from affecting the hole forming accuracy.

[0015] Furthermore, a spring is installed between the needle cap and the mounting hole. The spring is in a compressed and pre-tensioned state, providing an automatic reset force for the spring-loaded needle. When the mold opens, the spring pushes the needle cap back to its original position; when the mold closes, the needle cap is compressed again by the pressure of the fixed platen, completing the forward movement of the needle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the bottom shell in an embodiment of this utility model.

[0018] Figure 2 This is a schematic diagram of the bottom shell in an embodiment of the present invention.

[0019] Figure 3 This is a perspective view of the moving mold assembly in an embodiment of this utility model.

[0020] Figure 4 This is a perspective view of the first slider and the second slider in an embodiment of this utility model.

[0021] Figure 5 This is a schematic diagram of the structure of the first slider and the second slider in an embodiment of this utility model.

[0022] Figure 6 This is a perspective view of the first slider in an embodiment of this utility model.

[0023] Figure 7 This is a perspective view of the insert pin in an embodiment of this utility model.

[0024] Figure 8 This is a cross-sectional view of the first slider in an embodiment of this utility model.

[0025] Figure 9 This is a perspective view of the mold assembly in an embodiment of the present invention.

[0026] Explanation of the labels in the diagram: 1. Bottom shell; 2. Moving template; 3. First slider; 4. Hydraulic cylinder; 5. Second slider; 6. Guide rail; 7. Needle cap; 8. Cover plate; 9. Spring; 10. Insert pin; 11. Fixed template; 12. Inclined guide post; 1a. Connecting edge; 1b. Through hole; 3a. Angled guide hole; 3b. Mounting hole. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example

[0028] like Figure 3-9 As shown, this embodiment discloses an injection mold for a lamp base shell 1, including a movable mold plate 2 and a fixed mold plate 11. A first slider 3 and a second slider 5 are mounted on the movable mold plate 2, and a spring pin is elastically mounted on the first slider 3. In the mold-closed state, the spring pin is inserted into the part under the top pressure of the fixed mold plate 11 to form a through hole 1b structure; when the mold is opened, the spring pin automatically retracts under the action of elastic force after losing the top pressure of the fixed mold plate 11, realizing the extraction of the through hole 1b. Subsequently, the first slider 3 and the second slider 5 move in a direction away from each other, thereby completing the demolding of the connecting edge 1a with the through hole 1b.

[0029] Furthermore, combined Figure 8 As shown, the first slider 3 is provided with an inclined guide hole 3a, and the fixed template 11 is provided with an inclined guide post 12 corresponding to the inclined guide hole 3a. During mold closing, the inclined guide post 12 is inserted into the inclined guide hole 3a and forms a sliding fit. When the moving template 2 moves towards the fixed template 11, the inclined guide post 12 drives the first slider 3 to move along a set inclined path, so that the first slider 3 can be accurately positioned during mold closing. During mold opening, the moving template 2 moves in the opposite direction, and the pull-out action of the inclined guide post 12 drives the first slider 3 to move in the opposite direction, thereby assisting in the demolding action.

[0030] Furthermore, combined Figure 5 As shown, the second slider 5 is connected to a hydraulic cylinder 4. The hydraulic cylinder 4 is mounted on the moving template 2, and the end of the piston rod is fixedly connected to the second slider 5. When the hydraulic cylinder 4 extends, it pushes the second slider 5 to move closer to or further away from the first slider 3, thereby separating and releasing the outer edge of the workpiece; when the mold is closed, the hydraulic cylinder 4 extends, causing the second slider 5 to abut against the first slider 3. Driven by the hydraulic cylinder 4, the movement of the slider can be independently controlled, making the mold action sequence precisely adjustable, thus ensuring the coordinated operation of each mechanism during mold opening and closing.

[0031] Furthermore, the moving template 2 is equipped with a guide rail 6, on which the second slider 5 is slidably supported. The guide rail 6 is a parallel linear structure that defines the direction of movement of the second slider 5 and provides support for it. The guide rail 6 reduces the frictional resistance during the slider's movement, improves the stability and accuracy of the movement, and prevents the slider from shaking or shifting during the driving process of the hydraulic cylinder 4, thereby ensuring a smooth and reliable demolding action.

[0032] Furthermore, combined Figure 7-8 As shown, the spring pin includes a pin cap 7 and an insert pin 10. One end of the insert pin 10 is fixedly connected to one end of the pin cap 7, forming an integral force transmission structure. A cover plate 8 is installed on the surface of the first slider 3. When the mold is closed, the other end of the pin cap 7 presses against the fixed template 11. The clamping force of the fixed template 11 is transmitted to the insert pin 10 through the pin cap 7, causing the insert pin 10 to be inserted into the cavity to form a through hole 1b. When the mold is opened, after the fixed template 11 leaves, the pin cap 7 loses its top pressure constraint and retracts under the action of the elastic restoring force, driving the insert pin 10 to be pulled out from the through hole 1b of the part, realizing automatic demolding.

[0033] Furthermore, combined Figure 8 As shown, the first slider 3 has a stepped mounting hole 3b. The needle cap 7 slides into the larger hole within the mounting hole 3b, and the insert pin 10 slides into the smaller hole within the mounting hole 3b. The stepped structure guides the needle cap 7 and the insert pin 10 to move along the same axis, ensuring their coaxiality and stability. The larger hole accommodates the needle cap 7 and forms a buffer space, while the smaller hole supports the insert pin 10 and guides its insertion direction. This design ensures both the linear reciprocating motion of the spring pin and effectively limits its lateral sway, thereby improving the forming accuracy of the through hole 1b.

[0034] Furthermore, a spring 9 is provided between the needle cap 7 and the mounting hole 3b. The spring 9 is installed in a compressed state between the bottom of the needle cap 7 and the inner wall of the mounting hole 3b, that is, the spring 9 is installed in the buffer space. During the mold opening process, it provides a restoring force to the needle cap 7, so that the spring needle can automatically retract to its original position. When the mold closes, the fixed platen 11 presses against the needle cap 7, and the spring 9 is compressed to store energy, providing a restoring force for the next mold opening.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A lamp base injection mold comprising a moving mold plate and a stationary mold plate, characterized by: The moving template is equipped with a first slider and a second slider, and a spring pin is elastically mounted on the first slider. In the mold-closed state, the spring pin is inserted under the pressure of the fixed template to form a through hole structure. When the mold is opened, the spring pin automatically retracts after losing the pressure of the fixed template, realizing the extraction of the through hole. Then the first slider and the second slider move in a direction away from each other to complete the demolding of the edge with the through hole connection.

2. The lamp base shell injection mold of claim 1, wherein: The first slider is provided with an oblique guide hole, and the fixed template is provided with an oblique guide post corresponding to the oblique guide hole.

3. The lamp base shell injection mold of claim 1, wherein: The second slider is connected to a hydraulic cylinder.

4. The lamp base shell injection mold according to claim 3, characterized in that: The moving template is provided with a guide rail, and the second slider is slidably supported on the guide rail.

5. The lamp base shell injection mold according to claim 1, characterized in that: The spring pin includes a pin cap and an insert pin. One end of the insert pin is connected to one end of the pin cap, and the other end of the pin cap presses against the fixed template when the mold is closed.

6. The lamp base shell injection mold according to claim 5, characterized in that: The first slider has a stepped mounting hole, the pin cap slides into the larger hole in the mounting hole, and the insert pin slides into the smaller hole in the mounting hole.

7. The lamp base shell injection mold according to claim 6, characterized in that: A spring is provided between the needle cap and the mounting hole.

Images