Tail plate structure of injection molding machine

Abstract

A tail plate structure of an injection molding machine comprises a plate body, driving pieces are assembled on the plate body, the driving pieces are connected with a push plate, the number of the driving pieces is two, and the two driving pieces are oppositely assembled on the plate body; the driving piece comprises a first driving cylinder which is provided with a first piston rod, the first piston rod is hinged to a connecting rod piece, the other end of the connecting rod piece is hinged to the push plate, and an included angle alpha is formed between the axis of the piston rod and the axis of the connecting rod piece and is larger than or equal to 15 degrees and smaller than or equal to 75 degrees. Compared with the prior art, the two sets of oppositely-assembled first driving cylinders are adopted, the included angle alpha is formed between the first driving cylinders and the connecting rods, the movement speed of the push plate can be correspondingly reduced along with stretching-out of the piston rods and gradual increase of the included angle, and therefore the slower and more accurate mold closing action is achieved in the final stage of mold closing; and the die assembly precision and quality are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of the tail plate of an injection molding machine, and particularly relates to a structure of the tail plate of an injection molding machine. Background Art

[0002] During the injection molding production process of an injection molding machine, the tail plate structure plays a crucial role. Its main function is to drive the push plate to perform the mold closing and mold opening actions, ensuring that the mold can be accurately closed and smoothly opened. The traditional tail plate of an injection molding machine usually uses a single hydraulic cylinder as the driving part. The piston rod of the hydraulic cylinder is directly connected to the push plate or indirectly connected through a simple connecting rod mechanism.

[0003] In the tail plate structure driven by a single hydraulic cylinder, the movement speed of the piston rod is constant, resulting in the push plate moving at the same speed throughout the mold closing process. In the final stage of mold closing, the too-fast mold closing speed is likely to generate impacts and vibrations, affecting the accuracy and quality of mold closing, and further leading to a decrease in the dimensional accuracy and surface quality of the injection molded product. In addition, the single driving part structure makes the force application point of the push plate single during the movement process. This uneven force distribution is likely to cause the push plate to shake or shift in the case of easy generation of impact vibrations such as mold opening and closing, increasing the risk of wear and damage of components. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention is solved by the following technical solutions.

[0005] A structure of the tail plate of an injection molding machine includes a plate body. A driving part is assembled on the plate body. The driving part is connected to a push plate. There are two groups of driving parts, and the two groups of driving parts are relatively assembled on the plate body; the driving part includes a first driving cylinder, the first driving cylinder has a first piston rod, the first piston rod is hinged to a connecting rod member, and the other end of the connecting rod member is hinged to the push plate. An included angle α is formed between the axes of the first piston rod and the connecting rod member, and 15° ≤ α ≤ 75°.

[0006] Further, a dust-proof part is provided on the plate body, and a dust-proof sliding groove for accommodating the first piston rod is provided in the dust-proof part.

[0007] Further, it further includes two groups of second driving cylinders. The second driving cylinders have second piston rods. Ears are provided on both sides of the push plate, and the second piston rods are assembled and connected to the ears.

[0008] Further, a dust-proof part is provided on the plate body, and a dust-proof sliding groove for accommodating the second piston rods and the ears is provided in the dust-proof part.

[0009] Further, a dust suction interface is provided on the dust-proof part, and the dust suction interface is externally connected to a dust suction system.

[0010] Furthermore, the plate body is of a frame structure, including beam bodies distributed vertically and column bodies distributed horizontally. The first driving cylinder is assembled on the beam body, and the second driving cylinder is assembled on the column body.

[0011] Furthermore, 30° ≤ α ≤ 60°.

[0012] Furthermore, through holes for weight reduction are provided on the plate body.

[0013] Furthermore, the connecting rod member is of a hydraulic cylinder structure.

[0014] Furthermore, the first driving cylinder is a three-stage hydraulic cylinder.

[0015] Compared with the prior art, the present application has the following beneficial technical effects:

[0016] 1. Two sets of relatively assembled first driving cylinders are adopted, and an included angle α is formed between the first driving cylinder and the connecting rod. As the first piston rod extends, the included angle gradually increases, and the movement speed of the push plate will decrease accordingly, so as to achieve a slower and more accurate mold closing action in the final stage of mold closing, improving the accuracy and quality of mold closing. In addition, the two sets of driving members jointly drive the push plate, making the force on the push plate more uniform, avoiding the shaking or deviation caused by uneven force in the traditional single driving member structure, and significantly improving the stability of the tail plate of the injection molding machine during mold closing and mold opening.

[0017] 2. By setting the included angle range (15° ≤ α ≤ 75°, preferably 30° ≤ α ≤ 60°) between the first piston rod and the connecting rod member, the force transmission is made more reasonable. When the driving member works, it can not only ensure sufficient component force to drive the push plate to move, but also avoid problems such as excessive or too small component force caused by inappropriate angles, thereby reducing the stress risk of the connecting components and improving the reliability and durability of the entire structure.

[0018] 3. The second driving cylinder is used to assist the first driving cylinder in retracting the push plate during mold opening, which is beneficial to dispersing the force on the first piston rod and the connecting rod member and extending the service life of the first driving cylinder and the connecting rod member.

[0019] 4. The design of the dust-proof part and the dust suction interface can effectively prevent dust and impurities from entering the interior of the driving member, reduce the component wear and failure risk caused by dust, lower the maintenance cost, and improve the service life and working performance of the tail plate.

[0020] 5. The plate body is of a frame structure, and through holes for weight reduction are provided on the plate body. Without reducing the structural strength, the weight of the tail plate is effectively reduced, making the injection molding machine as a whole lighter, and at the same time, it is also beneficial to improve the energy efficiency of the injection molding machine.

[0021] 6. The connecting rod member adopts a hydraulic cylinder structure, and the first driving cylinder adopts a three-stage hydraulic cylinder, which greatly reduces the volume of the overall tailboard structure, especially the first driving cylinder, on the premise of ensuring the stroke of the push plate. At the same time, through the multi-stage hydraulic control of the first driving cylinder, the connecting rod member and the second driving cylinder, the tailboard structure can better cope with various complex injection molding processes and molds of different sizes. Description of the Drawings

[0022] Figure 1 It is an assembly drawing of part of the structure of an existing injection molding machine.

[0023] Figure 2 It is an assembly drawing of part of the structure of an injection molding machine adopting the tailboard structure of the present application.

[0024] Figure 3 It is a three-dimensional view of the tailboard structure Figure 1 .

[0025] Figure 4 It is a three-dimensional view of the tailboard structure Figure 2 .

[0026] Figure 5 It is a sectional view of the structure of the tailboard.

[0027] Figure 6 It is an assembly drawing of the driving cylinder and the push plate.

[0028] Figure 7 It is a front view of the plate body.

[0029] The following is an explanation of the reference numerals:

[0030] 100, plate body; 110, dust-proof part; 111, first dust-proof part; 112, second dust-proof part; 113, dust suction interface; 114, dust-proof chute; 120, beam body; 130, column body; 140, weight reduction groove;

[0031] 200, first driving cylinder; 210, first piston rod;

[0032] 300, connecting rod member;

[0033] 400, push plate; 410, ear part;

[0034] 500, second driving cylinder; 510, second piston rod. Detailed Embodiments

[0035] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0036] In the following embodiments, the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0037] In the description of the present invention, 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, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore should not be construed as a limitation of the present invention. In addition, the terms: first, second, etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present invention, unless otherwise clearly specified and limited, the terms: installation, connection, connection, etc. should be understood in a broad sense, and those of ordinary skill in the art can understand the specific meanings of the above terms in this practical application according to specific circumstances.

[0038] Referring to Figures 1 to 7 , an injection molding machine tail plate structure includes a plate body 100, a driving member is assembled on the plate body 100, the driving member is connected to a push plate 400, there are two groups of driving members, and the two groups of driving members are relatively assembled on the plate body 100; the driving member includes a first driving cylinder 200, the first driving cylinder 200 has a first piston rod 210, the first piston rod 210 is hinged to a connecting rod member 300, and the other end of the connecting rod member 300 is hinged to the push plate 400, and an angle α is formed between the axes of the first piston rod 210 and the connecting rod member 300. Under the above design, as the first piston rod 210 extends, the angle α gradually increases, and the movement speed of the push plate 400 will decrease accordingly, so as to achieve a slower and more precise mold closing action in the final stage of mold closing, improving the accuracy and quality of mold closing. In addition, the two groups of driving members jointly drive the push plate 400, making the force on the push plate 400 more uniform, avoiding the shaking or offset caused by uneven force in the traditional single driving member structure, and significantly improving the stability of the injection molding machine tail plate during mold closing and mold opening.

[0039] As an embodiment of the present application, the range of the angle α is limited within 15° ≤ α ≤ 75°. When the first driving cylinder 200 retracts, the angle α between the first piston rod 210 and the connecting rod member 300 decreases until 15°, and when the first driving cylinder 200 extends, the angle α between the first piston rod 210 and the connecting rod member 300 increases until 75°. Within this range, it can not only ensure that there is enough component force to pull the thrust seat backward when the first piston rod 210 retracts, but also avoid excessive other component forces causing abnormal stress on the connecting rod.

[0040] As another embodiment of the present application, the range of the included angle α can be further limited within 30° ≤ α ≤ 60°. This range setting makes the thrust more concentrated by increasing the direct acting force (effective component force) for pushing the push plate 400 and reducing the unnecessary component forces in other directions. However, within this range, the rotation angle of the connecting rod member 300 will be correspondingly reduced, resulting in a shorter stroke of the overall movement of the push plate 400 compared to the previous embodiment.

[0041] To avoid deformation or damage of components such as the connecting rod member 300 due to excessive local stress, two groups of second driving cylinders 500 are also assembled on the tail plate structure. The second driving cylinder 500 has a second piston rod 510. Ears 410 are provided on both sides of the push plate 400, and the second piston rod 510 is assembled and connected to the ears 410. The second driving cylinder 500 is used to assist the first driving cylinder 200 in the retraction movement of the push plate 400 during mold opening, which is beneficial to dispersing the forces on the first piston rod 210 and the connecting rod member 300 and extending the service lives of the first driving cylinder 200 and the connecting rod member 300.

[0042] Furthermore, a number of dust-proof parts 110 are provided on the plate body 100. The dust-proof parts 110 include a first dust-proof part 111 and a second dust-proof part 112. A dust-proof sliding groove 114 for accommodating the first piston rod 210 is provided in the first dust-proof part 111, and a dust-proof sliding groove 114 for accommodating the second piston rod 510 and the ears 410 is provided in the second dust-proof part 112. A dust suction interface 113 is provided on the dust-proof part 110, and the dust suction interface 113 is externally connected to a dust suction system. The design of the dust-proof part 110 and the dust suction interface 113 can effectively prevent dust and impurities from entering the interior of the driving parts, reduce the component wear and the risk of failures caused by dust, lower the maintenance cost, and improve the service life and working performance of the tail plate.

[0043] To improve the applicability of the present application, the connecting rod member 300 adopts a hydraulic cylinder structure, and the first driving cylinder 200 adopts a three-stage hydraulic cylinder. On the premise of ensuring the stroke of the push plate 400, the volume of the overall tail plate structure, especially the first driving cylinder 200, is greatly reduced. At the same time, through the multi-stage hydraulic control of the first driving cylinder 200, the connecting rod member 300, and the second driving cylinder 500, the tail plate structure described in the present application can better cope with various complex injection molding processes and molds of different sizes.

[0044] In the present application, the plate body 100 is of a frame structure, including beam bodies 120 distributed vertically and column bodies 130 distributed horizontally. The first driving cylinder 200 is assembled on the beam body 120, and the second driving cylinder 500 is assembled on the column body 130. A through weight-reducing groove 140 is provided in the middle of the frame structure, and the first dust-proof part 111 is located in the weight-reducing groove 140, which can enhance the structural strength.

[0045] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be subject to the claims, and any substitutions, deformations, and improvements that are easily conceivable by those skilled in the art to this technology shall fall within the protection scope of the present invention.

Claims

1. A tail plate structure of an injection molding machine, comprising a plate body (100), a driving member being mounted on the plate body (100), the driving member being connected to a push plate (400), characterized in that: There are two groups of driving members, which are relatively mounted on the plate body (100); the driving members include a first driving cylinder (200), the first driving cylinder (200) has a first piston rod (210), the first piston rod (210) is hinged to a connecting rod (300), the other end of the connecting rod (300) is hinged to the push plate (400), and an angle α is formed between the axes of the first piston rod (210) and the connecting rod (300), and 15°≤α≤75°.

2. The tail plate structure of an injection molding machine according to claim 1, characterized in that: A dustproof portion (110) is provided on the plate body (100), and a dustproof sliding groove (114) for accommodating the first piston rod (210) is provided in the dustproof portion (110).

3. The tail plate structure of an injection molding machine according to claim 1, characterized in that: It also includes two groups of second drive cylinders (500), the second drive cylinders (500) having second piston rods (510), ears (410) are provided on both sides of the push plate (400), and the second piston rods (510) are assembled and connected to the ears (410).

4. The tail plate structure of an injection molding machine according to claim 3, characterized in that: A dustproof portion (110) is provided on the plate body (100), and a dustproof sliding groove (114) for accommodating the second piston rod (510) and the ear portion (410) is provided in the dustproof portion (110).

5. The tail plate structure of an injection molding machine according to claim 2 or 4, characterized in that: The dustproof part (110) is provided with a dust suction interface (113), and the dust suction interface (113) is connected to an external dust suction system.

6. The tail plate structure of an injection molding machine according to claim 3, characterized in that: The plate body (100) is a frame-shaped structure, comprising a beam body (120) distributed vertically and a column body (130) distributed horizontally. The first driving cylinder (200) is assembled on the beam body (120), and the second driving cylinder (500) is assembled on the column body (130).

7. The tail plate structure of an injection molding machine according to claim 1, characterized in that: 30°≤α≤60°。 8. The tail plate structure of an injection molding machine according to claim 1, characterized in that: A through-going weight-reducing groove (140) is provided on the plate body (100).

9. The tail plate structure of an injection molding machine according to claim 1, characterized in that: The connecting rod (300) is a hydraulic cylinder structure.

10. The tail plate structure of an injection molding machine according to claim 1, characterized in that: The first driving cylinder (200) is a three-stage hydraulic cylinder.

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