Hydraulic ejection structure of plastic mold

Abstract

The utility model discloses a hydraulic ejection structure of a plastic mold. The hydraulic ejection structure comprises a mold base, a lower mold is fixed to the upper portion in the mold base, a fixing plate is installed on the lower portion in the mold base, a fixing mechanism is arranged below the fixing plate, and an ejection mechanism is arranged above the fixing plate. According to the hydraulic ejection structure of the plastic mold, through cooperative use of the ejection mechanism, when a product is formed and needs to be ejected out, an ejector pin is driven to ascend under the action of a hydraulic cylinder, so that the product is ejected out from the interior of the lower mold, and meanwhile, a second spring is compressed after a telescopic sleeve makes contact with the product; and the first spring is arranged to buffer the rising of the ejection plate, the ejection speed and the ejection force of the ejector pin can be reduced in a double-buffering manner, the product is prevented from being damaged or deformed due to sudden strong impact, the appearance and the internal structure of the plastic product are protected, the ejection stability is improved, and the product quality is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field related to ejection structures, in particular to a hydraulic ejection structure of a plastic mould. Background Art

[0002] A plastic mold is a combined mold used for compression molding, extrusion molding, injection molding, blow molding and low-foaming molding. It can process a series of plastic parts of different shapes and sizes through the coordinated changes of the mold convex and concave molds and the auxiliary molding system. Plastic molds occupy an important position in the modern manufacturing industry and are widely used in many fields. The hydraulic ejection structure is an important part of the mold design. It is responsible for smoothly ejecting the molded product from the mold after the mold is opened.

[0003] However, when the existing hydraulic ejection mechanism ejects the product, the direct buffering effect between the product and the ejector pin is poor, which can easily cause the ejector pin to damage the product and affect the yield rate. Therefore, the present application provides a hydraulic ejection structure for a plastic mold to meet the needs. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic ejection structure for a plastic mold to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solutions: a hydraulic ejection structure of a plastic mold, comprising a mold base, a lower mold is fixed on the upper part of the mold base, a fixing plate is installed on the lower part of the mold base, a fixing mechanism is arranged below the fixing plate, and an ejection mechanism is arranged above the fixing plate;

[0006] The ejection mechanism includes a hydraulic cylinder, a hydraulic rod, an ejection plate, a guide rod, a first spring, an ejector pin, a second spring and a telescopic sleeve. The hydraulic cylinder is installed above a fixed plate, a hydraulic rod is installed above the hydraulic cylinder, an ejection plate is fixed above the hydraulic rod, a guide rod passes through the ejection plate, a first spring is sleeved above the outer side of the guide rod, an ejector pin is fixed above the ejection plate, a second spring is installed above the ejector pin, and a telescopic sleeve is sleeved above the ejector pin.

[0007] Preferably, the fixing mechanism includes a protrusion, a positioning hole, a groove, a screw, a knob and a positioning rod, the protrusion is fixed on both sides of the fixing plate, positioning holes are provided on both sides of the fixing plate, grooves are provided on both sides of the inside of the mold base, screws pass through both sides of the mold base, a knob is fixed to one end of the screw, and a positioning rod is fixed to the other end of the screw.

[0008] Preferably, the fixing plate is snap-connected with the mold base via a protrusion, and the protrusion is used in conjunction with the groove.

[0009] Preferably, the positioning rod forms a telescopic structure with the mold base through a screw rod, and the diameter of the positioning rod is the same as that of the positioning hole.

[0010] Preferably, the ejection plate and the fixed plate form a lifting structure through a hydraulic cylinder, and the hydraulic cylinder is symmetrically arranged with respect to the central axis of the fixed plate.

[0011] Preferably, the telescopic sleeve forms a telescopic structure with the ejector pins through the second spring, and the ejector pins are distributed at equal intervals above the ejection plate.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The hydraulic ejection structure of a plastic mold, through the cooperation of the ejection mechanism, when the product is formed and needs to be ejected, the hydraulic cylinder drives the ejector pin to rise so as to eject the product from the inside of the lower mold, and at the same time, the telescopic sleeve compresses the second spring after contacting the product, and the setting of the first spring can buffer the rise of the ejector plate. The double buffering method can slow down the ejection speed and force of the ejector pin, avoid damage or deformation of the product due to sudden strong impact, help protect the appearance and internal structure of the plastic product, improve the ejection stability and ensure product quality;

[0014] 2. The hydraulic ejection structure of the plastic mold is provided with a fixing mechanism. The fixing plate is installed under the mold base by inserting the protrusion into the inside of the groove. At the same time, the knob can be turned to drive the screw to extend and retract until the positioning rod is extended into the inside of the positioning hole. The fixing of the fixing plate is completed. The installation and fixing method is relatively simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the fixing mechanism of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the ejection mechanism of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the ejector pin of the utility model.

[0019] In the figure: 1. mold base; 2. lower mold; 3. fixing plate; 4. fixing mechanism; 401. bump; 402. positioning hole; 403. groove; 404. screw; 405. knob; 406. positioning rod; 5. ejector mechanism; 501. hydraulic cylinder; 502. hydraulic rod; 503. ejector plate; 504. guide rod; 505. first spring; 506. ejector pin; 507. second spring; 508. telescopic sleeve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-2 The utility model provides a technical solution: a hydraulic ejection structure of a plastic mold, including a mold base 1, a lower mold 2 is fixed on the upper part of the mold base 1, a fixing plate 3 is installed on the lower part of the mold base 1, a fixing mechanism 4 is arranged below the fixing plate 3, and the fixing mechanism 4 includes a convex block 401, a positioning hole 402, a groove 403, a screw 404, a knob 405 and a positioning rod 406, the convex block 401 is fixed on both sides of the fixing plate 3, both sides of the fixing plate 3 are provided with positioning holes 402, both sides of the mold base 1 are provided with grooves 403, both sides of the mold base 1 are penetrated by screws 404, one end of the screw 404 is fixed with a knob 405, and the other end of the screw 404 is fixed with a knob 405. A positioning rod 406 is fixed, and the installation and fixing method of the fixing plate 3 is relatively simple and fast, and the structure is relatively flexible. The fixing plate 3 is connected to the mold base 1 by the protrusion 401, and the protrusion 401 is used in conjunction with the groove 403. The protrusion 401 is inserted into the inside of the groove 403 to install the fixing plate 3 under the mold base 1, which is convenient for the installation of the fixing plate 3. The positioning rod 406 forms a telescopic structure with the mold base 1 through the screw 404. The diameter of the positioning rod 406 is the same as that of the positioning hole 402. The knob 405 is turned to drive the screw 404 to extend and retract until the positioning rod 406 extends into the inside of the positioning hole 402 to complete the fixing of the fixing plate 3. An ejection mechanism 5 is arranged above the fixing plate 3;

[0022] See also Figure 1 , Figure 3 and Figure 4The ejection mechanism 5 includes a hydraulic cylinder 501, a hydraulic rod 502, an ejection plate 503, a guide rod 504, a first spring 505, an ejector pin 506, a second spring 507 and a telescopic sleeve 508. The hydraulic cylinder 501 is installed above the fixed plate 3. The hydraulic rod 502 is installed above the hydraulic cylinder 501. The ejection plate 503 is fixed above the hydraulic rod 502. The ejection plate 503 forms a lifting structure with the fixed plate 3 through the hydraulic cylinder 501. The hydraulic cylinder 501 is symmetrically arranged with the central axis of the fixed plate 3. When the product needs to be ejected after the product is formed, the ejector pin 506 is driven to rise by the action of the hydraulic cylinder 501 to eject the product from the inside of the lower mold 2. The inside of the ejection plate 503 is penetrated by the guide rod 504. The guide rod 50 4, a first spring 505 is sleeved on the upper outer side, an ejector pin 506 is fixed on the upper side of the ejector plate 503, a second spring 507 is installed on the upper side of the ejector pin 506, a telescopic sleeve 508 is sleeved on the upper side of the ejector pin 506, the telescopic sleeve 508 and the ejector pin 506 form a telescopic structure through the second spring 507, the ejector pins 506 are evenly distributed above the ejector plate 503, the telescopic sleeve 508 will compress the second spring 507 after contacting with the product, and the setting of the first spring 505 can buffer the rise of the ejector plate 503, and the ejection speed and force of the ejector pin 506 can be slowed down by double buffering, so as to avoid damage or deformation of the product due to sudden strong impact, which is helpful to protect the appearance and internal structure of the plastic product.

[0023] Working principle: When using the hydraulic ejection structure of the plastic mold, first insert the protrusion 401 into the groove 403 to install the fixed plate 3 under the mold base 1, and at the same time, turn the knob 405 to drive the screw 404 to extend and retract until the positioning rod 406 extends into the positioning hole 402 to complete the fixation of the fixed plate 3. Secondly, when the product is formed and needs to be ejected, turn on the switch of the hydraulic cylinder 501 to drive the ejector pin 506 to rise, thereby ejecting the product from the lower mold 2. At the same time, the telescopic sleeve 508 will compress the second spring 507 after contacting the product, and the setting of the first spring 505 can buffer the rise of the ejection plate 503. The double buffering method can slow down the ejection speed and force of the ejector pin 506, thereby protecting the appearance and internal structure of the plastic product. The model of the hydraulic cylinder 501 is ROB20X50-CM, and the use process of the hydraulic ejection structure of the plastic mold is completed.

[0024] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic ejection structure for a plastic mold, comprising a mold base (1), characterized in that: A lower mold (2) is fixed on the upper part of the mold base (1), a fixing plate (3) is installed on the lower part of the mold base (1), a fixing mechanism (4) is arranged below the fixing plate (3), and an ejection mechanism (5) is arranged above the fixing plate (3); The ejection mechanism (5) comprises a hydraulic cylinder (501), a hydraulic rod (502), an ejection plate (503), a guide rod (504), a first spring (505), an ejector pin (506), a second spring (507) and a telescopic sleeve (508). The hydraulic cylinder (501) is mounted above the fixed plate (3). The hydraulic rod (502) is mounted above the hydraulic cylinder (501). The ejection plate (503) is fixed above the hydraulic rod (502). The guide rod (504) penetrates the interior of the ejection plate (503). The first spring (505) is sleeved above the outer side of the guide rod (504). The ejector pin (506) is fixed above the ejection plate (503). The second spring (507) is mounted above the ejector pin (506). The telescopic sleeve (508) is sleeved above the ejector pin (506).

2. The hydraulic ejection structure of a plastic mold according to claim 1, characterized in that: The fixing mechanism (4) comprises a protrusion (401), a positioning hole (402), a groove (403), a screw (404), a knob (405) and a positioning rod (406); the protrusion (401) is fixed on both sides of the fixing plate (3); both sides of the fixing plate (3) are provided with positioning holes (402); both sides of the interior of the mold base (1) are provided with grooves (403); both sides of the mold base (1) are penetrated by screws (404); one end of the screw (404) is fixed with a knob (405); the other end of the screw (404) is fixed with a positioning rod (406).

3. The hydraulic ejection structure of a plastic mold according to claim 2, characterized in that: The fixing plate (3) is snap-connected with the mold base (1) via a protrusion (401), and the protrusion (401) is used in conjunction with the groove (403).

4. The hydraulic ejection structure of a plastic mold according to claim 2, characterized in that: The positioning rod (406) forms a telescopic structure with the mold base (1) through the screw rod (404), and the positioning rod (406) has the same diameter as the positioning hole (402).

5. The hydraulic ejection structure of a plastic mold according to claim 1, characterized in that: The ejection plate (503) forms a lifting structure with the fixed plate (3) through a hydraulic cylinder (501), and the hydraulic cylinder (501) is symmetrically arranged with respect to the central axis of the fixed plate (3).

6. The hydraulic ejection structure of a plastic mold according to claim 1, characterized in that: The telescopic sleeve (508) forms a telescopic structure with the ejector pins (506) via the second spring (507), and the ejector pins (506) are distributed at equal intervals above the ejection plate (503).

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