Auxiliary device for reducing mold clamping force of injection molding machine

Abstract

The utility model relates to an auxiliary device for reducing mold clamping force of an injection molding machine, the auxiliary device is mounted on a mold, the mold comprises a fixed mold plate, a movable mold plate and mold feet mounted at the bottom of the movable mold plate, the auxiliary device comprises two fixed mold drag hooks symmetrically mounted on two sides of the fixed mold plate, and the free ends of the fixed mold drag hooks are provided with hook parts; the two semi-fixed bent elbows are rotationally installed on the two sides of the movable mold plate respectively, the two sides of the free ends of the semi-fixed bent elbows are rotationally connected with power bent elbows and movable bent elbows respectively, and the two power bent elbows are arranged in a V shape; and the power device is installed on the mold foot, one end of the power device is rotationally connected with the two power bent elbows, and the two power bent elbows are pulled through the power device so as to control the two movable bent elbows to be unfolded or folded. The inside of the mold does not need to be changed, only an auxiliary device needs to be additionally arranged outside the mold, meanwhile, a small injection molding machine is used in a matched mode, products which can only be produced through a large injection molding machine can be produced, production cost is reduced, and competitiveness of companies is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machine auxiliary, in particular to an auxiliary device for reducing the clamping force of an injection molding machine. Background Art

[0002] With the advancement of the reduction of automotive parts and lightweighting (replacing steel with plastic), the improved products are getting larger and larger. The original 3300-ton injection molding machines in the industry are already the largest. Now, products such as all-plastic tailgates and all-plastic roof cover panels all require 4000-ton or larger injection molding machines for production. Such ultra-large injection molding machines occupy a large space and have high energy consumption during production, which is not conducive to improving production efficiency and also results in a waste of energy.

[0003] The current solutions adopted, as Figure 6 shown, install the required mold 10 on the injection molding machine 20. That is, for products of what size, injection molding machines of the corresponding size are used. The production cost of the products is relatively high, the bargaining space is small when quoting, and the order acceptance rate is low. During production, large injection molding machines have high energy consumption. The moving parts of the injection molding machine are relatively heavy and have a large momentum, which will result in a long molding cycle. In addition, the number of large injection molding machines is small, and the ordering time for large injection molding machines is also extremely long. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an auxiliary device for reducing the clamping force of an injection molding machine. Without modifying the inside of the mold, only an auxiliary device needs to be added outside the mold, and when used in conjunction with a small injection molding machine, products that can only be produced by large injection molding machines can be produced, reducing the production cost and greatly enhancing the company's competitiveness.

[0005] The technical solution adopted by the utility model to solve its technical problem is: to provide an auxiliary device for reducing the clamping force of an injection molding machine. The auxiliary device is installed on the mold. The mold includes a fixed template, a movable template, and mold feet installed at the bottom of the movable template. The auxiliary device includes:

[0006] Two fixed mold hooks, symmetrically installed on both sides of the fixed template. The free end of the fixed mold hook is provided with a hook portion.

[0007] Two semi-fixed toggle joints, respectively rotatably installed on both sides of the movable template. The two sides of the free end of the semi-fixed toggle joint are respectively rotatably connected to a power toggle joint and a movable toggle joint. The two power toggle joints are arranged in a V shape.

[0008] A power device, installed on the mold feet. One end of the power device is rotatably connected to the two power toggle joints, and the two movable toggle joints are controlled to expand or retract by pulling the two power toggle joints through the power device.

[0009] As a supplement to the technical solution of the present utility model, a lower fixed plate is installed at the bottom of the die foot, a positioning groove is provided on the lower fixed plate, and the lower part of the power device is located in the positioning groove.

[0010] As a supplement to the technical solution of the present utility model, the power device adopts an oil cylinder.

[0011] As a supplement to the technical solution of the present utility model, one end of the piston rod of the oil cylinder is connected with a toggle connecting block, and one end of the toggle connecting block is rotatably connected with two power toggles.

[0012] As a supplement to the technical solution of the present utility model, a I-shaped adapter is installed at one end of the piston rod of the oil cylinder, and a T-shaped groove matching with the adapter is provided on the toggle connecting block.

[0013] As a supplement to the technical solution of the present utility model, two anti-slip fixing blocks are symmetrically arranged on both sides of the end face of the die foot. When the fixed template and the moving template are closed, the two fixed die hooks are respectively attached to the corresponding anti-slip fixing blocks.

[0014] As a supplement to the technical solution of the present utility model, the inner side wall of the anti-slip fixing block is an inner inclined surface, and an outer inclined surface matching with the inner inclined surface is provided on the outer side of the free end of the fixed die hook.

[0015] As a supplement to the technical solution of the present utility model, an avoidance inclined surface is provided on the inner wall of each fixed die hook, and the distance between the two avoidance inclined surfaces gradually increases from the fixed end to the free end of the fixed die hook.

[0016] As a supplement to the technical solution of the present utility model, a groove is provided at one end of the power toggle, one end of the semi-fixed toggle and one end of the movable toggle are both inserted into the groove and connected by a rotating shaft, and a clamping portion matching with the hook portion is provided at the other end of the movable toggle.

[0017] As a supplement to the technical solution of the present utility model, a first arc surface is provided at one end of the clamping portion, and the first arc surface matches with the hook portion.

[0018] As a supplement to the technical solution of the present utility model, a second arc surface is provided at the other end of the clamping portion, and the second arc surface matches with the side wall of the power toggle.

[0019] Beneficial effects: The present utility model relates to an auxiliary device for reducing the clamping force of an injection molding machine. After installing at least one set of auxiliary devices on the mold, products that originally required a larger injection molding machine can be produced with a smaller injection molding machine. The more obvious the benefit is for larger injection molding machines. In addition, for some products that require high-pressure holding pressure to adjust for shrinkage or product dimensions, it can also improve the flash of the product formed due to insufficient clamping force. After adopting the auxiliary device, the injection molding machine remains the original one, and only a locking mechanism is added to the mold, with little increase in cost and obvious improvement in injection molding efficiency. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the mold clamping process of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the loosening process of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the mold opening process of the present utility model;

[0023] Figure 4 is a schematic structural diagram of the present utility model with the mold, anti-slip fixing block, and fixed mold hook removed;

[0024] Figure 5 is a schematic structural diagram of the movable toggle of the present utility model;

[0025] Figure 6 is a schematic structural diagram of the traditional technical solution.

[0026] Illustration: 10. Mold, 20. Injection molding machine, 100. Fixed template, 200. Movable template, 300. Mold feet, 400. Lower fixing plate, 101. Fixed mold hook, 102. Hook part, 103. Avoidance inclined plane, 104. Outer inclined plane, 201. Hook part, 202. Movable mold fixing block, 203. Power toggle, 204. Movable toggle, 205. Rotating shaft, 301. Power device, 302. Toggle connecting block, 303. Anti-slip fixing block, 304. Inner inclined plane, 305. Adapter, 3021. T-shaped groove, 401. Positioning groove, 2031. Groove, 2041. Clamping part, 2042. First arc surface, 2043. Second arc surface. Detailed Embodiments

[0027] The following further elaborates the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0028] Serial number 1 2 3 Injection molding machine model (ton) 2500 3300 4000 Production cost (yuan / hour) 250 400 800

[0029] As can be seen from the above table, in the production cost of an injection molding factory, the larger the tonnage of the injection molding machine, the higher the cost. Since in the industry, injection molding machines with a tonnage of 4000 tons are less common, although the injection molding tonnage is only 700 tons larger than that of 3300 tons (an increase of 21%), the production cost has doubled. Therefore, reducing the tonnage of the injection molding machine can reduce the cost. Taking the reduction from 4000 tons to 3300 tons as an example, the benefits generated in one year are: (800 - 400) * 22 hours * 22 days * 12 months = 2,323,200 yuan, approximately 2.323 million yuan; in addition, the number of 4000-ton injection molding machines in the factory is not large. Therefore, the present utility model is mainly aimed at improving the above problems.

[0030] As Figures 1-5 shown, an auxiliary device for reducing the clamping force of an injection molding machine, the auxiliary device is installed on the mold, and the mold includes a fixed template 100, a movable template 200, and a mold foot 300 installed at the bottom of the movable template 200. The auxiliary device includes:

[0031] Two fixed mold hooks 101, symmetrically installed on both sides of the fixed template 100, and a hook portion 102 is provided at the free end of the fixed mold hook 101;

[0032] Two semi-fixed toggle joints 201, respectively rotatably installed on both sides of the movable template 200. On both sides of the free end of the semi-fixed toggle joint 201, a power toggle joint 203 and a movable toggle joint 204 are respectively rotatably connected, and the two power toggle joints 203 are arranged in a V shape;

[0033] A power device 301, installed on the mold foot 300, one end of the power device 301 is rotatably connected to the two power toggle joints 203, and by pulling the two power toggle joints 203 through the power device 301, the two movable toggle joints 204 are controlled to expand or retract.

[0034] In this embodiment, when the auxiliary device is used in cooperation with the mold, the number can be two or one, and can be adjusted according to actual needs; generally, the preferred solution is two, and the two auxiliary devices are respectively installed on both sides of the mold. Such an arrangement has better stability and more uniform force; of course, it can also be one, installed on one side of the mold.

[0035] As Figures 1-3As shown, a lower fixed plate 400 is installed at the bottom of the die leg 300. A positioning groove 401 is provided in the middle of the upper end of the lower fixed plate 400. When the power device 301 is installed, the lower part of the power device 301 is inserted into the positioning groove 401. Then, the hole positions on the power device 301 are aligned with the hole positions on the die leg 300, and fasteners are installed for fixed connection. The design of the positioning groove 401 can quickly install and position the power device 301, improving the assembly efficiency.

[0036] In this embodiment, the power device 301 is to provide a linear reciprocating motion to control the expansion or retraction of the two movable toggle joints 204, realizing the locked state or the unlocked state; the locked state is Figure 3 As shown, the fixed template 100 and the movable template 200 are closed, and one end of the movable toggle joint 204 is buckled into the corresponding hook portion 102, which can reduce the requirement for the clamping force of the injection molding machine; the unlocked state is Figure 2 As shown, one end of the movable toggle joint 204 is not buckled into the corresponding hook portion 102.

[0037] Specifically, the power device 301 adopts an oil cylinder. One end of the piston rod of the oil cylinder is connected with a toggle joint connecting block 302, and is rotationally connected with the two power toggle joints 203 through the toggle joint connecting block 302; the adapter 305 is designed in an I shape, and is matched with the T-shaped groove 3021 provided on the toggle joint connecting block 302 through the I-shaped adapter 305, realizing the quick connection between the oil cylinder and the toggle joint connecting block 302, greatly simplifying the assembly difficulty, and at the same time canceling the fasteners for connection.

[0038] In this embodiment, two anti-slip fixing blocks 303 are symmetrically arranged on both sides of the end face of the die leg 300. When the fixed template 100 and the movable template 200 are clamped, the two fixed die hooks 101 are respectively attached to the corresponding anti-slip fixing blocks 303. Refer to Figure 2 and Figure 3 As shown, the inner side wall of the anti-slip fixing block 303 is an inner inclined surface 304. Through the cooperation of the outer inclined surface 104 on the outside of the fixed die hook 101 and the inner inclined surface 304 on the inside of the anti-slip fixing block 303, the anti-slip fixing block 303 and the fixed die hook 101 are closely attached, reducing the shaking of the fixed die hook 101 and ensuring the structural stability during clamping.

[0039] In this embodiment, an avoidance inclined surface 103 is provided on the inner wall of each fixed die hook 101. The distance between the two avoidance inclined surfaces 103 gradually increases from the fixed end to the free end of the fixed die hook 101. The design of the avoidance inclined surface 103 enables the movable toggle joint 204 and the semi-fixed toggle joint 201 to have a larger movement space, reducing the dimensional requirements for the movable toggle joint 204 and the semi-fixed toggle joint 201, shortening the lengths of the movable toggle joint 204 and the semi-fixed toggle joint 201, and reducing the cost.

[0040] like Figure 4 As shown, a groove 2031 is provided at one end of the power elbow 203, one end of the semi-fixed elbow 201 and one end of the movable elbow 204 are inserted into the groove 2031 and rotatably connected through the rotating shaft 205, and a clamping portion 2041 is provided at the other end of the movable elbow 204, and the thickness of the clamping portion 2041 is greater than the width of the groove 2031.

[0041] Furthermore, a first arc surface 2042 is provided at one end of the clamping portion 2041, and the first arc surface 2042 cooperates with the hook portion 102 to make the clamping portion 2041 clamped into or out of the hook portion 102 smoother; a second arc surface 2043 is provided at the other end of the clamping portion 2041, and the second arc surface 2043 cooperates with the side wall of the power elbow 203 to make the movable elbow 204 move more flexibly and smoothly.

[0042] In this embodiment, a movable mold fixing block 202 is installed on each side of the end surface of the movable mold plate 200, and a half of a fixed elbow 201 is rotatably connected to the lower end of each movable mold fixing block 202.

[0043] The usage process of this embodiment is described as follows:

[0044] Locking process: After the mold is closed, the power device 301 drives the elbow connecting block 302 to move upward, driving the two power elbows 203 to move and expand to both sides, and the angle formed by the semi-fixed elbow 201 and the movable elbow 204 becomes larger until it becomes a flat angle. At this time, the semi-fixed elbow 201 and the movable elbow 204 are on the same straight line, and the free end of the movable elbow 204 is inserted into the hook part 102 of the fixed mold hook 101, and the mold itself is locked.

[0045] Loosening process: After the injection molding is completed, the power device 301 drives the elbow connecting block 302 to move downward, driving the two power elbows 203 to move inward and closer, and the angle formed by the semi-fixed elbow 201 and the movable elbow 204 becomes smaller until the free end of the movable elbow 204 leaves the hook portion 102 of the fixed mold hook 101. As the elbow connecting block 302 continues to move downward, the movable elbow 204 completely leaves the active area of the fixed mold hook 101, and the mold itself is locked and loosened.

[0046] Mold opening process: After the injection molding is completed, the mold clamping mechanism of the mold itself must be loosened first, and the mold foot 300 moves downward together with the movable mold, the movable and fixed molds begin to separate, the injection molded product is ejected, and then the mold is closed to enter the next injection molding process.

[0047] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0048] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0049] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0050] The above has introduced in detail an auxiliary device for reducing the clamping force of an injection molding machine provided in the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. An auxiliary device for reducing the clamping force of an injection molding machine. This auxiliary device is installed on a mold. The mold includes a fixed template (100), a movable template (200), and mold feet (300) installed at the bottom of the movable template (200), and is characterized in that: The auxiliary device described above includes: Two fixed die hooks (101), symmetrically installed on both sides of the fixed die plate (100), and a hook portion (102) is provided at the free end of the fixed die hook (101); Two semi-fixed toggle joints (201), respectively rotatably installed on both sides of the moving die plate (200), and a power toggle joint (203) and a movable toggle joint (204) are respectively rotatably connected to both sides of the free end of the semi-fixed toggle joint (201), and the two power toggle joints (203) are arranged in a V shape; A power device (301), installed on the die foot (300), one end of the power device (301) is rotatably connected to the two power toggle joints (203), and the two movable toggle joints (204) are controlled to expand or contract by pulling the two power toggle joints (203) through the power device (301).

2. The auxiliary device for reducing the clamping force of an injection molding machine according to claim 1, characterized in that: A lower fixed plate (400) is installed at the bottom of the die foot (300), a positioning groove (401) is opened on the lower fixed plate (400), and the lower part of the power device (301) is located in the positioning groove (401).

3. An auxiliary device for reducing the clamping force of an injection molding machine according to claim 1 or 2, characterized in that: The power device (301) adopts an oil cylinder, one end of the piston rod of the oil cylinder is connected with a toggle joint connecting block (302), and one end of the toggle joint connecting block (302) is rotatably connected to the two power toggle joints (203).

4. An auxiliary device for reducing the clamping force of an injection molding machine according to claim 3, characterized in that: One end of the piston rod of the oil cylinder is installed with an I-shaped adapter (305), and a T-shaped groove (3021) matching with the adapter (305) is opened on the toggle joint connecting block (302).

5. An auxiliary device for reducing the clamping force of an injection molding machine according to claim 1, characterized in that: Two anti-slip fixing blocks (303) are symmetrically arranged on both sides of the end face of the die foot (300). When the fixed die plate (100) and the moving die plate (200) are closed, the two fixed die hooks (101) are respectively attached to the corresponding anti-slip fixing blocks (303).

6. The auxiliary device for reducing the clamping force of an injection molding machine according to claim 5, wherein: The inner side wall of the anti-slip fixing block (303) is an inner inclined surface (304), and an outer inclined surface (104) matching with the inner inclined surface (304) is provided on the outer side of the free end of the fixed die hook (101).

7. An auxiliary device for reducing the clamping force of an injection molding machine according to claim 1, characterized in that: An avoidance inclined surface (103) is provided on the inner wall of each fixed die hook (101), and the distance between the two avoidance inclined surfaces (103) gradually increases from the fixed end to the free end of the fixed die hook (101).

8. An auxiliary device for reducing the clamping force of an injection molding machine according to claim 1, characterized in that: A groove (2031) is opened at one end of the power toggle joint (203), one end of the semi-fixed toggle joint (201) and one end of the movable toggle joint (204) are both inserted into the groove (2031) and connected by a rotating shaft (205), and a clamping portion (2041) matching with the hook portion (102) is provided at the other end of the movable toggle joint (204).

9. An auxiliary device for reducing the clamping force of an injection molding machine according to claim 8, characterized in that: A first arc surface (2042) is provided at one end of the clamping portion (2041), and the first arc surface (2042) matches with the hook portion (102).

10. An auxiliary device for reducing the clamping force of an injection molding machine according to claim 8, characterized in that: A second arc surface (2043) is provided at the other end of the clamping portion (2041), and the second arc surface (2043) matches with the side wall of the power toggle joint (203).

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