Hydraulic ejector pin limiting mechanism of injection molding machine

Abstract

The utility model relates to a limiting mechanism, in particular to a hydraulic ejector pin limiting mechanism of an injection molding machine, which comprises a base, a mold, a hydraulic cylinder, a mounting disc, an ejector pin, a screw rod, a limiting plate and a transmission component, the mold is mounted on the base, the hydraulic cylinder is mounted at the top of the base, the mounting disc is connected onto a telescopic rod of the hydraulic cylinder, and the ejector pin is connected onto the mounting disc. The ejector pin penetrates through the mold in a sliding mode, two lead screws are rotationally connected to the mold, the two lead screws are jointly connected with a limiting plate through threads, the limiting plate is used for limiting the installation disc, and the two lead screws are in transmission through a transmission assembly. The telescopic rod of the hydraulic cylinder extends to drive the mounting disc and the ejector pin to move leftwards to eject a finished product, and the limiting plate can limit the mounting disc, so that the ejector pin is limited, the movement range of the ejector pin is limited, the ejector pin is prevented from exceeding a preset stroke, and equipment damage or finished product defects can be avoided.

Description

Technical Field

[0001] This utility model relates to a limiting mechanism, and more particularly to a hydraulic ejector pin limiting mechanism for an injection molding machine. Background Technology

[0002] Hydraulic ejector pins (also known as push rods or ejector pins) of injection molding machines are key components used in the injection molding process to push the product out of the mold. Driven by a hydraulic system, they can push the finished product out of the mold cavity after the mold opens, ensuring that the finished product can be taken out smoothly without damage.

[0003] After injection molding is completed, the ejector pin is moved by hydraulic pressure to eject the finished product. However, the ejector pin has no limit to its range of motion under hydraulic pressure and is prone to exceeding the predetermined stroke. This may cause damage due to excessive pressure or improper operation, which can easily lead to equipment damage or product defects. Utility Model Content

[0004] In view of this, the present invention provides a hydraulic ejector pin limiting mechanism for injection molding machines, which can overcome the disadvantages that the ejector pin has no limit to its range of motion under hydraulic action, is prone to exceeding the predetermined stroke, and may be damaged due to excessive pressure or improper operation, which can easily cause equipment damage or product defects.

[0005] A hydraulic ejector pin limiting mechanism for an injection molding machine includes a base, a mold, a hydraulic cylinder, a mounting plate, an ejector pin, lead screws, a limiting plate, and a transmission assembly. The mold is mounted on the base, and the hydraulic cylinder is mounted on the top of the base. The mounting plate is connected to the telescopic rod of the hydraulic cylinder, and the ejector pin is connected to the mounting plate. The ejector pin slides through the mold. Two lead screws are rotatably connected to the mold, and the two lead screws are connected by threads to a limiting plate for limiting the mounting plate. The two lead screws are driven by the transmission assembly.

[0006] To further explain, the transmission assembly includes a transmission wheel and a transmission belt. The lead screw is connected to a transmission wheel, and a transmission belt is wound around the two transmission wheels.

[0007] To further explain, it also includes nitrogen springs, which are installed on the mounting plate.

[0008] To further explain, it also includes a buffer pad, with the nitrogen spring connected to the end facing the limiting plate.

[0009] To further explain, it also includes guide rods, which are connected to the mold to guide the mounting plate and the limiting plate. The guide rods slide through the mounting plate and the limiting plate.

[0010] To further explain, it also includes a guide ring. The mold is connected to a guide ring for guiding the ejector pin. The ejector pin is located inside the guide ring, and the ejector pin and the guide ring are in sliding fit.

[0011] The beneficial effects of this utility model are as follows: the extension of the telescopic rod of the hydraulic cylinder can drive the mounting plate and the ejector pin to move to the left, ejecting the finished product. The limiting plate can limit the mounting plate, thereby limiting the ejector pin and restricting its range of motion, preventing the ejector pin from exceeding the predetermined stroke, thus avoiding equipment damage or product defects. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0013] Figure 2 This is a three-dimensional structural diagram of the transmission component of this utility model.

[0014] Figure 3 This is a three-dimensional structural diagram of the nitrogen spring of this utility model.

[0015] Figure 4 This is a three-dimensional structural diagram of the nitrogen spring and buffer pad of this utility model.

[0016] Figure 5 This is a three-dimensional structural diagram of the guide rod and guide ring of this utility model.

[0017] The markings in the attached diagram are: 1: base, 2: mold, 3: hydraulic cylinder, 4: mounting plate, 5: ejector pin, 6: lead screw, 7: limit plate, 8: drive wheel, 9: drive belt, 10: nitrogen spring, 11: buffer pad, 12: guide rod, 13: guide ring. Detailed Implementation

[0018] The present invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0019] Reference Figure 1 and Figure 2 A hydraulic ejector pin limiting mechanism for an injection molding machine includes a base 1, a mold 2, a hydraulic cylinder 3, a mounting plate 4, ejector pins 5, lead screws 6, a limiting plate 7, and a transmission assembly. The mold 2 is mounted on the left side of the base 1. The hydraulic cylinder 3 is bolted to the top of the base 1. The left end of the telescopic rod of the hydraulic cylinder 3 is connected to the mounting plate 4. Six ejector pins 5 are evenly spaced around the left side of the mounting plate 4. The ejector pins 5 slide through the mold 2. Lead screws 6 are rotatably connected to the front and rear sides of the right side of the mold 2. The two lead screws 6 are connected to the limiting plate 7 by threads. The two lead screws 6 are driven by the transmission assembly.

[0020] Reference Figure 2The transmission assembly includes a transmission wheel 8 and a transmission belt 9. The right side of the lead screw 6 is connected to the transmission wheel 8 by a key, and the transmission belt 9 is wound around the two transmission wheels 8.

[0021] Reference Figure 3 and Figure 4 It also includes a nitrogen spring 10, with nitrogen springs 10 installed at both the front and rear of the mounting plate 4.

[0022] Reference Figure 4 It also includes a buffer pad 11, and the left end of the nitrogen spring 10 is connected to the buffer pad 11.

[0023] Reference Figure 5 It also includes guide rods 12. Guide rods 12 are connected to both the front and rear sides of the right side of the mold 2. The guide rods 12 slide through the mounting plate 4 and the limiting plate 7.

[0024] Reference Figure 5 It also includes guide rings 13. Six guide rings 13 are evenly spaced around the right side of the mold 2. The ejector pin 5 is located inside the guide rings 13, and the ejector pin 5 and the guide rings 13 slide together.

[0025] The operator controls the extension rod of hydraulic cylinder 3 to move the mounting plate 4 to the left. The mounting plate 4 then moves the ejector pin 5 to the left, ejecting the finished product. The limiting plate 7 can limit the mounting plate 4, thereby limiting the ejector pin 5 and restricting its range of motion to prevent it from exceeding its predetermined stroke. This avoids equipment damage or product defects. The nitrogen spring 10 reduces the impact force on the mounting plate 4, extending the service life of both the mounting plate 4 and the limiting plate 7. The buffer pad 11 is in direct contact with the limiting plate 7, and it reduces the impact of frequent shocks and vibrations. The wear caused by the nitrogen spring 10 is reduced, extending the service life of the nitrogen spring 10. The guide rod 12 can guide the mounting plate 4 and the ejector pin 5, and the guide ring 13 can guide the ejector pin 5, ensuring that the ejector pin 5 moves linearly without deviation, reducing wear and improving accuracy. Rotating one of the lead screws 6 drives the other lead screw 6 to rotate through the transmission wheel 8 and the transmission belt 9. The lead screw 6 drives the limit plate 7 to move left and right. Adjusting the distance between the limit plate 7 and the mounting plate 4 can be adjusted according to the size of the finished product to adapt to different finished products.

[0026] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent substitutions made within the principles of this utility model should be included within the protection scope of this utility model. Contents not described in detail in this utility model are existing technologies known to those skilled in the art.

Claims

1. A hydraulic ejector pin limiting mechanism for an injection molding machine, comprising a base (1) and a mold (2), wherein the mold (2) is mounted on the base (1), characterized in that: It also includes a hydraulic cylinder (3), a mounting plate (4), an ejector pin (5), a lead screw (6), a limiting plate (7), and a transmission assembly. The hydraulic cylinder (3) is mounted on the top of the base (1). The mounting plate (4) is connected to the telescopic rod of the hydraulic cylinder (3). The ejector pin (5) is connected to the mounting plate (4). The ejector pin (5) slides through the mold (2). Two lead screws (6) are rotatably connected to the mold (2). The two lead screws (6) are connected together by a threaded limiting plate (7) for limiting the mounting plate (4). The two lead screws (6) are driven by the transmission assembly.

2. The hydraulic ejector pin limiting mechanism for an injection molding machine according to claim 1, characterized in that: The transmission assembly includes a transmission wheel (8) and a transmission belt (9). The lead screw (6) is connected to the transmission wheel (8), and the two transmission wheels (8) are wound with the transmission belt (9).

3. A hydraulic ejector pin limiting mechanism for an injection molding machine according to claim 2, characterized in that: It also includes a nitrogen spring (10), which is mounted on the mounting plate (4).

4. A hydraulic ejector pin limiting mechanism for an injection molding machine according to claim 3, characterized in that: It also includes a buffer pad (11), and the end of the nitrogen spring (10) facing the limiting plate (7) is connected to the buffer pad (11).

5. A hydraulic ejector pin limiting mechanism for an injection molding machine according to claim 4, characterized in that: It also includes a guide rod (12), which is connected to the mold (2) to guide the mounting plate (4) and the limiting plate (7). The guide rod (12) slides through the mounting plate (4) and the limiting plate (7).

6. A hydraulic ejector pin limiting mechanism for an injection molding machine according to claim 5, characterized in that: It also includes a guide ring (13), and the mold (2) is connected to a guide ring (13) for guiding the ejector pin (5). The ejector pin (5) is located inside the guide ring (13), and the ejector pin (5) and the guide ring (13) are in sliding fit.

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