Length adjusting mechanism for straight ejector rod on injection mold

Abstract

The invention provides an injection mold upper straight ejector rod length adjusting mechanism which comprises a mold foot, a core plate, a core fixing plate, an ejector pin bottom plate and an ejector pin panel, an ejection oil cylinder is arranged on the ejector pin bottom plate to achieve ejection of the ejector pin bottom plate relative to the core fixing plate, and a straight ejector rod mounting hole and a threaded hole which penetrate through the upper surface and the lower surface are formed in the ejector pin panel. The upper end of the straight ejector rod penetrates through the core plate and then is connected with a straight ejector block, the bottom of the straight ejector rod is vertically arranged in the straight ejector rod mounting hole, a threaded sleeve is connected in the threaded hole, the bottom face of the straight ejector rod makes contact with the top face of the threaded sleeve for positioning, the outer side face of the lower portion of the threaded sleeve is in threaded connection with a locking nut, the locking nut is located below the ejector pin panel, and a threaded hole is formed in the bottom face of the straight ejector rod. The locking screw penetrates through the threaded sleeve and then is in threaded connection in a threaded hole in the bottom face of the straight ejector rod, the side face of the straight ejector rod is provided with a straight groove face in the axial direction, the top of the ejector pin panel is connected with a first anti-rotation block, and the first anti-rotation block makes contact with the straight groove face. The extending length of the straight ejector rod relative to the ejector pin bottom plate can be adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to a length adjustment mechanism for a straight ejector rod on an injection mold. Background Art

[0002] Now is the era of rapid development of automotive molds, which emphasizes the concepts of high efficiency, accuracy and cost reduction. The realization of automated production of molds is the most direct manifestation of improving the production capacity of parts; therefore, in the process of mold design and manufacturing, we must consider parts, standardization, and interchangeability; avoid the original non-standard single-piece production model.

[0003] In the injection mold of automotive parts, the straight ejector is a very critical and commonly used component. When adjusting the length of the straight ejector, the template height and processing accuracy will cause dimensional errors. This will lead to inaccurate heights between the ejector and the ejector block. In addition, the straight ejector will fatigue in subsequent production, and the screws will easily loosen during long-term mass production, resulting in ejector block marks. In severe cases, the ejector block cannot be reset to the lowest position and collides with the cavity, requiring regular maintenance and inspection. This is time-consuming and labor-intensive, affecting production efficiency. At the same time, when there is a processing error in the length of the ejector, it is usually necessary to grind it specifically, which is labor-intensive, inefficient, and requires high operating requirements from workers. Summary of the invention

[0004] In view of the above problems, the present invention aims to provide a length adjustment mechanism for a straight ejector rod on an injection mold, which has a novel structure and can adjust the length of the straight ejector rod extending relative to the ejector pin base plate, allowing a certain error in the overall length of the straight ejector rod during the processing process, and the self-locking structure is stable after the straight ejector rod is adjusted, which can avoid loosening in subsequent production.

[0005] The technical scheme of the present invention is a straight ejector rod length adjustment mechanism on an injection mold, comprising a core plate and a core fixing plate connected by a mold foot, wherein the top surface of the core fixing plate is provided with an ejector bottom plate and an ejector panel, wherein the ejector bottom plate is provided with an ejector oil cylinder to realize ejection relative to the core fixing plate, wherein the ejector panel is provided with a stepped hole passing through the upper and lower surfaces, wherein the stepped hole comprises an upper straight ejector rod mounting hole and a lower threaded hole, wherein the upper end of the straight ejector rod passes through the core plate and is connected to a straight ejector block, and the bottom of the straight ejector rod is vertically arranged In the installation hole of the straight push rod, a threaded sleeve is connected to the threaded hole, the bottom surface of the straight push rod is in contact with the top surface of the threaded sleeve for positioning, the outer side surface of the lower part of the threaded sleeve is threadedly connected with a locking nut, the locking nut is located below the ejector panel, a threaded hole is provided on the bottom surface of the straight push rod, the locking screw passes through the threaded sleeve and is threadedly connected to the threaded hole on the bottom surface of the straight push rod, a straight groove surface is axially provided on the side surface of the straight push rod, and a first anti-rotation block is connected to the top of the ejector panel, the first anti-rotation block contacts the straight groove surface for positioning to prevent the straight push rod from rotating.

[0006] Preferably, the straight groove surface extends from the bottom surface of the straight push rod to the upper area, and the bottom surface of the core plate is connected to a second anti-rotation block, which contacts the straight groove surface to prevent the straight push rod from rotating.

[0007] Preferably, the first anti-rotation block is connected to the ejector panel by screws, and the second anti-rotation block is connected to the core plate by screws.

[0008] Preferably, the diameter of the straight push rod installation hole is larger than the diameter of the threaded hole, and the outer diameter of the straight push rod is larger than the outer diameter of the threaded sleeve.

[0009] Preferably, a shock-proof gasket is provided between the locking screw and the threaded sleeve.

[0010] Preferably, the number of the shock-proof gaskets is 2, which are stacked up and down.

[0011] Preferably, an airtight operating hole is provided on the bottom plate of the ejector pin, and the screw sleeve, locking nut and locking screw are all located in the operating hole.

[0012] Preferably, the number of ejector oil cylinders on the ejector base plate is 4, which are distributed at the left and right ends of the front and rear long sides of the ejector base plate.

[0013] The present invention can adjust the length of the straight ejector rod extending relative to the ejector pin base plate, allowing a certain error in the overall length of the straight ejector rod during processing, and after the straight ejector rod is adjusted, stable positioning can be achieved through a self-locking structure, thereby avoiding loosening in subsequent production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure between the medium core plate, the ejector panel, the ejector bottom plate and the straight ejector rod of the present invention; Figure 3 for Figure 2 The main view of Figure 4 for Figure 3 Cross-sectional view along AA direction; Figure 5 for Figure 4 A partial enlarged view of point B in the middle; Figure 6 It is a schematic diagram of the connection structure of the straight push rod in the present invention; Among them: 1—mold foot; 2—core plate; 3—core fixing plate; 4—ejector base plate; 41—operating hole; 5—ejector panel; 51—stepped hole; 511—straight ejector rod mounting hole; 512—threaded hole; 6—straight ejector rod; 61—straight groove surface; 7—screw sleeve; 8—locking nut; 9—locking screw; 10—first anti-rotation block; 11—second anti-rotation block; 12—anti-vibration gasket. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0016] like Figures 1 to 6 As shown, the present invention provides a straight ejector length adjustment mechanism on an injection mold, comprising a core plate 2 and a core fixing plate 3 connected by a mold foot 1, wherein the top surface of the core fixing plate 3 is provided with an ejector base plate 4 and an ejector panel 5, wherein the ejector base plate 4 is provided with an ejector oil cylinder to realize ejection relative to the core fixing plate 3, wherein the ejector panel 5 is provided with a stepped hole 51 passing through the upper and lower surfaces, wherein the stepped hole 51 comprises an upper straight ejector mounting hole 511 and a lower threaded hole 512, wherein the upper end of the straight ejector 6 passes through the core plate 2 and is connected to the straight ejector block, and the bottom of the straight ejector 6 is vertically arranged on the straight ejector A screw sleeve 7 is connected to the threaded hole 512 in the rod mounting hole 511, the bottom surface of the straight push rod 6 is in contact with the top surface of the screw sleeve 7 for positioning, the outer side surface of the lower part of the screw sleeve 7 is threadedly connected with a locking nut 8, the locking nut 8 is located below the ejector panel 5, a threaded hole is provided on the bottom surface of the straight push rod 6, and a locking screw 9 is threadedly connected to the threaded hole on the bottom surface of the straight push rod 6 after passing through the screw sleeve 7. A straight groove surface 61 is axially provided on the side surface of the straight push rod 6, and a first anti-rotation block 10 is connected to the top of the ejector panel 5, and the first anti-rotation block 10 contacts the straight groove surface 61 for positioning to prevent the straight push rod 6 from rotating.

[0017] In the above scheme, the straight groove surface 61 extends from the bottom surface of the straight push rod 6 to the upper area, and the bottom surface of the core plate 2 is connected with a second anti-rotation block 11, which contacts the straight groove surface 61 to prevent the straight push rod 6 from rotating.

[0018] In addition, the first anti-rotation block 10 is connected to the ejector panel 5 by screws, and the second anti-rotation block 11 is connected to the core plate 2 by screws.

[0019] In addition, the diameter of the straight push rod installation hole 511 is larger than the diameter of the threaded hole 512 , and the outer diameter of the straight push rod 6 is larger than the outer diameter of the threaded sleeve 7 .

[0020] Specifically, a shock-proof gasket 12 is provided between the locking screw 9 and the threaded sleeve 7 .

[0021] Specifically, the number of the shockproof gaskets 12 is two, which are stacked up and down.

[0022] In addition, an operating hole 41 is provided on the ejector base plate 4 to avoid air, and the threaded sleeve 7 , the locking nut 8 , and the locking screw 9 are all located in the operating hole 41 .

[0023] Furthermore, the number of ejector oil cylinders on the ejector base plate 4 is 4, which are distributed at the left and right ends of the front and rear long sides of the ejector base plate 4.

[0024] The working principle of the present invention is as follows: When adjusting the height of the straight push rod 6, insert the lower part of the straight push rod 6 into the straight push rod mounting hole 511, rotate the screw sleeve 7 to control the height of the top surface of the screw sleeve 7, and after the height is adjusted to the right position, tighten the locking nut 8 to accurately lock the screw sleeve 7 to prevent slight axial movement due to thread error, and finally tighten the locking screw 9 to pull the straight push rod 6. The anti-vibration gasket 12 can effectively prevent the locking screw 9 from loosening, completely fix the position of the bottom surface of the straight push rod 6, and also determine the position of the top surface of the straight push rod 6. Due to the setting of the first anti-rotation block 10 and the second anti-rotation block 11, the straight push rod 6 will not rotate. When the locking screw 9 is tightened, the bottom surface of the straight push rod 6 and the top surface of the screw sleeve 7 are fixed as one. Since the straight push rod 6 cannot rotate, the screw sleeve 7 cannot rotate either, and finally the straight push rod 6 is fixed at the current position, and it is guaranteed that it will not loosen for a long time in the later production process.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the invention in any form. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A mechanism for adjusting the length of a straight ejector rod on an injection mold, comprising a core plate (2) and a core fixing plate (3) connected by a mold foot (1), the top surface of the core fixing plate (3) being provided with an ejector base plate (4) and an ejector face plate (5), the ejector base plate (4) being provided with an ejector oil cylinder for ejecting the ejector relative to the core fixing plate (3), characterized in that: The ejector panel (5) is provided with a stepped hole (51) penetrating the upper and lower surfaces, the stepped hole (51) comprising an upper straight ejector rod mounting hole (511) and a lower threaded hole (512), the upper end of the straight ejector rod (6) passes through the core plate (2) and is connected to the straight ejector block, the bottom of the straight ejector rod (6) is vertically arranged in the straight ejector rod mounting hole (511), a screw sleeve (7) is connected in the threaded hole (512), the bottom surface of the straight ejector rod (6) is in contact with the top surface of the screw sleeve (7) for positioning, and the lower portion of the screw sleeve (7) is The outer side surface is threadedly connected with a locking nut (8), the locking nut (8) is located below the ejector panel (5), the bottom surface of the straight ejector rod (6) is provided with a threaded hole, the locking screw (9) passes through the threaded sleeve (7) and is threadedly connected to the threaded hole on the bottom surface of the straight ejector rod (6), the side surface of the straight ejector rod (6) is axially provided with a straight groove surface (61), the top of the ejector panel (5) is connected with a first anti-rotation block (10), the first anti-rotation block (10) contacts the straight groove surface (61) to prevent the straight ejector rod (6) from rotating.

2. The injection mold upper straight ejector rod length adjustment mechanism according to claim 1, characterized in that: The straight groove surface (61) extends from the bottom surface of the straight push rod (6) to the upper area, and the bottom surface of the core plate (2) is connected to a second anti-rotation block (11), and the second anti-rotation block (11) contacts the straight groove surface (61) to prevent the straight push rod (6) from rotating.

3. The mechanism for adjusting the length of a straight ejector rod on an injection mold according to claim 2, characterized in that: The first anti-rotation block (10) is connected to the ejector panel (5) by means of screws, and the second anti-rotation block (11) is connected to the core plate (2) by means of screws.

4. The injection mold upper straight ejector rod length adjustment mechanism according to claim 1, characterized in that: The diameter of the straight push rod mounting hole (511) is larger than the diameter of the threaded hole (512), and the outer diameter of the straight push rod (6) is larger than the outer diameter of the threaded sleeve (7).

5. The injection mold upper straight ejector rod length adjustment mechanism according to claim 1, characterized in that: An anti-vibration gasket (12) is provided between the locking screw (9) and the screw sleeve (7).

6. The injection mold upper straight ejector rod length adjustment mechanism according to claim 5, characterized in that: The number of the anti-vibration gaskets (12) is 2, which are stacked up and down.

7. The injection mold upper straight ejector rod length adjustment mechanism according to claim 1, characterized in that: The ejector base plate (4) is provided with an airtight operating hole (41), and the threaded sleeve (7), locking nut (8), and locking screw (9) are all located in the operating hole (41).

8. The injection mold upper straight ejector rod length adjustment mechanism according to claim 1, characterized in that: The ejector oil cylinders on the ejector base plate (4) are four in number and are distributed at the left and right ends of the ejector base plate (4) in the front and rear long side directions.

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