A mold locking mechanism for an injection molding machine

Abstract

The utility model relates to the technical field of plastic forming machinery, concretely is a kind of injection molding machine lock mode mechanism, it includes: rack, the one side of the rack is fixedly connected with fixed mould plate, the guide rod surface of the rack is slidably connected with movable mould plate, the butt joint surface of fixed mould plate and movable mould plate is evenly provided with positioning mechanism and locking mechanism, and the positioning mechanism is used to dismount and install to mould, the locking mechanism is used to improve the stability of mould installation. By setting positioning mechanism, make a motor and symmetrical connecting rod structure drive four positioning plates synchronous movement, fundamentally ensure the uniformity and contemporaneity of clamping force exertion, mould is smoothly, synchronously pushed to center line, effectively avoid the problem that mould is pushed skew, positioning eccentricity due to single installation block first contact of original structure, and discard bidirectional screw rod structure, instead adopt the driving mode of motor plus connecting rod, its itself does not bear huge axial thrust or radial bending moment.

Description

Technical Field

[0001] This utility model relates to the field of plastic molding machinery technology, specifically to a mold clamping mechanism for an injection molding machine. Background Technology

[0002] The mold clamping mechanism of an injection molding machine is one of the core components of the injection molding machine. Its function is to ensure that the mold is reliably locked during the injection and holding of molten plastic, and to prevent the mold from opening due to the high pressure in the cavity, thereby ensuring the precision and quality of the product.

[0003] For example, in the patent with publication number CN222755924U, a rotating handwheel drives a bidirectional screw to rotate, causing the mounting blocks on both sides to move away from each other. Then, an external hoisting device is used to place the injection mold to be installed on the upper end of the two pallets in sequence. Then, by rotating the handwheels on both sides clockwise in sequence, the bidirectional screw rotates and drives the mounting blocks on both sides to move closer together under the sliding restriction of the sliding groove, and insert them into the mounting grooves opened on the front and back sides of the registered mold to achieve rapid installation of the injection mold.

[0004] However, the thread manufacturing of the bidirectional lead screw in this structure has tolerances, and the friction of the sliding grooves on both sides cannot be completely consistent. This will cause one mounting block to contact the mold first, and the other to contact it later. The block that contacts first will bear all the thrust until the other block also contacts it. This may not only cause the mold to be pushed off-center and unable to be accurately positioned, but also cause the bidirectional lead screw to bear additional radial bending moment, accelerate wear, and cause the final clamping position of the mold to be not the center line of the equipment, but eccentric. Therefore, a mold clamping mechanism for injection molding machines is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a mold clamping mechanism for an injection molding machine to solve at least one technical problem existing in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A mold clamping mechanism for an injection molding machine, comprising:

[0008] A frame, wherein a fixed template is fixedly connected to one side of the frame, and a movable template is slidably connected to the surface of the guide rod of the frame. The mating surfaces of the fixed template and the movable template are provided with a positioning mechanism and a locking mechanism. The positioning mechanism is used to disassemble and install the mold, and the locking mechanism is used to improve the stability of the mold installation.

[0009] The positioning mechanism includes a motor, a turntable, four sets of connecting rods, and a positioning plate;

[0010] The turntable is fixedly connected to the output shaft end of the motor, and the motor is used to drive the turntable to rotate. The turntable in the rotating state is used to drive the four connecting rods to move synchronously, and the four connecting rods in the moving state are respectively used to drive the four positioning plates to move synchronously.

[0011] Preferably, the positioning mechanism further includes a mounting bracket and four sets of sliding grooves and anti-slip textures;

[0012] The mating surfaces of the fixed template and the moving template are both fixedly connected to mounting brackets. The sliding groove is formed on the surface of the mounting bracket, and the anti-slip texture is formed on the clamping surface of the positioning plate.

[0013] Preferably, motors are fixedly installed on the mating surfaces of the fixed template and the moving template, the connecting rod is rotatably connected to one side of the turntable, and the connecting rod is rotatably connected to the bottom of the positioning plate.

[0014] Preferably, the protrusion of the positioning plate is slidably connected to the inside of the slide groove, and the positioning plate moves along the inner wall trajectory of the slide groove.

[0015] Preferably, the anti-slip texture has a wave-shaped structure and is used to disperse the pressure on the clamping surface of the positioning plate and reduce stress concentration.

[0016] Preferably, the four positioning plates in a close proximity state are used to clamp and position the mold, and the four positioning plates in a far-away moving state are used to release the clamping and positioning of the mold.

[0017] Preferably, the locking mechanism includes an electric push rod, a locking rod, and multiple lock holes;

[0018] Electric push rods are fixedly installed on the mating surfaces of the fixed template and the moving template, and are located on one side of the motor. The locking hole is opened on the surface of the turntable, and the locking rod is fixedly connected to the output end of the electric push rod.

[0019] Preferably, the plurality of lock holes are arranged in a ring, and the output end of the electric push rod after being energized is used to drive the lock rod to move.

[0020] Preferably, the locking hole is used for inserting the locking rod into it, and the locking hole and locking rod in the engaged state are used to improve the stability of locking the rotation of the turntable.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. By setting up a positioning mechanism, a motor and a symmetrical linkage structure drive four positioning plates to move synchronously, which fundamentally ensures the uniformity and simultaneity of the clamping force. The mold is pushed to the center line smoothly and synchronously, effectively avoiding the problem of mold being pushed off-center and positioning being eccentric due to the original structure where a single mounting block makes contact first. Moreover, the two-way screw structure is abandoned and a motor plus linkage drive method is adopted instead. It does not bear huge axial thrust or radial bending moment, but only needs to overcome the friction of the positioning plate movement and the adjustment resistance of the mold, which greatly reduces wear.

[0023] 2. By setting a locking mechanism, an additional mechanical lock is provided after positioning is completed, forming a double insurance, which effectively improves the rigidity and stability of the entire mold clamping mechanism during high-pressure injection molding and prevents mold displacement. Attached Figure Description

[0024] Figure 1 This is a front view structural diagram of the present utility model.

[0025] Figure 2 This is a schematic diagram of the positioning mechanism of this utility model.

[0026] Figure 3 This is a schematic diagram of the locking mechanism of this utility model.

[0027] Figure 4 This is a top view of the positioning mechanism of this utility model.

[0028] In the diagram: 1. Frame; 2. Fixed template; 3. Moving template; 4. Positioning mechanism; 401. Mounting bracket; 402. Motor; 403. Positioning plate; 404. Turntable; 405. Connecting rod; 406. Slide groove; 407. Anti-slip texture; 5. Locking mechanism; 501. Electric push rod; 502. Locking hole; 503. Locking rod. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0030] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-4 This utility model provides an embodiment of a mold clamping mechanism for an injection molding machine:

[0034] A mold clamping mechanism for an injection molding machine, comprising:

[0035] A frame 1 has a fixed template 2 fixedly connected to one side of the frame 1, and a movable template 3 slidably connected to the guide rod surface of the frame 1. The mating surfaces of the fixed template 2 and the movable template 3 are provided with a positioning mechanism 4 and a locking mechanism 5. The positioning mechanism 4 is used to disassemble and install the mold, and the locking mechanism 5 is used to improve the stability of the mold installation.

[0036] The positioning mechanism 4 includes a motor 402, a turntable 404, four sets of connecting rods 405, and a positioning plate 403;

[0037] The turntable 404 is fixedly connected to the output shaft end of the motor 402, and the motor 402 is used to drive the turntable 404 to rotate. The rotating turntable 404 is used to drive the four connecting rods 405 to move synchronously, and the four connecting rods 405 in motion are used to drive the four positioning plates 403 to move synchronously.

[0038] The positioning mechanism 4 also includes a mounting bracket 401, four sets of sliding grooves 406, and anti-slip textures 407;

[0039] Mounting brackets 401 are fixedly connected to the mating surfaces of fixed template 2 and moving template 3. Slide grooves 406 are formed on the surface of mounting brackets 401, and anti-slip textures 407 are formed on the clamping surface of positioning plates 403. The above structural design enables the output shaft of motor 402 in operation to drive turntable 404 to rotate. Turntable 404 in operation drives four connecting rods 405 to move. Then, the four connecting rods 405 in operation drive the four positioning plates 403 to move synchronously.

[0040] Motors 402 are fixedly installed on the mating surfaces of fixed template 2 and moving template 3. Connecting rods 405 are rotatably connected to one side of turntable 404, and connecting rods 405 are rotatably connected to the bottom of positioning plate 403. The above structural design enables the four connecting rods 405 in motion to drive the four positioning plates 403 to move synchronously towards each other along the slide 406, and the four positioning plates 403 contact the outer wall of the mold from four directions at the same time.

[0041] The protrusion of the positioning plate 403 is slidably connected to the inside of the slide groove 406, and the positioning plate 403 moves along the inner wall trajectory of the slide groove 406. The above structural design enables the four positioning plates 403 to move stably along the inner wall trajectory of the slide groove 406.

[0042] In one preferred embodiment, the anti-slip texture 407 has a wave-shaped structure and is used to disperse the pressure on the clamping surface of the positioning plate 403 and reduce stress concentration. The above-mentioned structural design makes the wave-shaped anti-slip texture 407 not only increase the friction and prevent the mold from sliding during clamping, but more importantly, it can disperse the contact pressure of the clamping surface, reduce local stress concentration, and avoid damaging the mold surface.

[0043] In one preferred embodiment, four positioning plates 403 in a close proximity state are used to clamp and position the mold, and four positioning plates 403 in a moving distance state are used to release the clamping and positioning of the mold. The above structural design allows the four positioning plates 403 to contact the outer wall of the mold from four directions simultaneously and apply a uniform clamping force to accurately push the mold to and position it at the center of the fixed template 2 or the moving template 3. The four connecting rods 405 drive the four positioning plates 403 to move synchronously away from each other, releasing the clamping of the mold.

[0044] In one preferred embodiment, the locking mechanism 5 includes an electric push rod 501, a locking rod 503, and a plurality of lock holes 502;

[0045] Electric push rods 501 are fixedly installed on the mating surfaces of the fixed template 2 and the moving template 3, and are located on one side of the motor 402. Locking holes 502 are opened on the surface of the turntable 404, and locking rods 503 are fixedly connected to the output end of the electric push rods 501. The above structural design allows the electric push rods 501 to be energized and started after the positioning mechanism 4 completes the clamping and positioning of the mold. The output end of the electric push rods 501 extends and pushes the locking rods 503 at its end to move forward, so that the locking rods 503 are inserted into one of the locking holes 502, forming a mechanical engagement. The engagement of the locking rods 503 and the locking holes 502 achieves complete circumferential and radial constraint on the turntable 404, preventing it from rotating.

[0046] In one preferred embodiment, the multiple keyholes 502 are arranged in a ring, and the output end of the electric push rod 501 after being energized is used to drive the locking rod 503 to move. The above structural design allows the output end of the electric push rod 501 to extend and push the locking rod 503 at its end to move forward, so that the locking rod 503 is inserted into one of the keyholes 502.

[0047] In one preferred embodiment, the locking hole 502 is used for the locking rod 503 to be inserted into it, and the locking hole 502 and the locking rod 503 in the engaged state are used to improve the stability of the rotational locking of the turntable 404. The above structural design allows the locking rod 503 to be inserted into one of the locking holes 502 to form a mechanical engagement. The engagement of the locking rod 503 and the locking hole 502 achieves complete circumferential and radial constraint on the turntable 404.

[0048] The working principle of this utility model is as follows: First, the motor 402 is started, and the output shaft of the running motor 402 drives the turntable 404 to rotate. The rotating turntable 404 drives the four connecting rods 405 to move. When the clamping action is performed, the four moving connecting rods 405 respectively drive the four positioning plates 403 to move synchronously towards each other along the slide groove 406. The four positioning plates 403 contact the outer wall of the mold from four directions at the same time and apply a uniform clamping force to accurately push the mold to and position it at the center position of the fixed template 2 or the moving template 3. As mentioned above, when it is necessary to disassemble the mold, the output shaft of the motor 402 rotates in the opposite direction, and the four connecting rods 405 drive the four positioning plates 403 to move synchronously away from each other, releasing the clamping of the mold. Since the clamping surface of the positioning plate 403 is formed with a wave-shaped anti-slip texture 407, this structure can not only increase the friction and prevent the mold from sliding during the clamping process, but more importantly, it can disperse the contact pressure of the clamping surface, reduce local stress concentration, and avoid damaging the mold surface.

[0049] After the positioning mechanism 4 completes the clamping and positioning of the mold, the electric push rod 501 is energized and started. The output end of the electric push rod 501 extends and pushes the locking rod 503 at its end forward, so that the locking rod 503 is inserted into one of the locking holes 502, forming a mechanical engagement. The engagement of the locking rod 503 and the locking hole 502 achieves complete circumferential and radial constraint on the turntable 404, preventing it from rotating. This rigid locking method ensures that even if vibration or impact occurs during the operation of the injection molding machine, the clamping position of the positioning plate 403 will not change, and the mold position remains absolutely fixed.

[0050] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A mold clamping mechanism for an injection molding machine, characterized in that, It includes: A frame (1) is provided with a fixed template (2) fixedly connected to one side of the frame (1) and a movable template (3) slidably connected to the guide rod surface of the frame (1). The mating surfaces of the fixed template (2) and the movable template (3) are provided with a positioning mechanism (4) and a locking mechanism (5). The positioning mechanism (4) is used to disassemble and install the mold, and the locking mechanism (5) is used to improve the stability of the mold installation. The positioning mechanism (4) includes a motor (402), a turntable (404), four sets of connecting rods (405), and a positioning plate (403); The turntable (404) is fixedly connected to the output shaft end of the motor (402), and the motor (402) is used to drive the turntable (404) to rotate. The turntable (404) in the rotating state is used to drive the four connecting rods (405) to move synchronously, and the four connecting rods (405) in the moving state are respectively used to drive the four positioning plates (403) to move synchronously.

2. The injection molding machine clamping mechanism according to claim 1, characterized in that: The positioning mechanism (4) also includes a mounting bracket (401), four sets of sliding grooves (406), and anti-slip textures (407); The mating surfaces of the fixed template (2) and the moving template (3) are both fixedly connected to the mounting bracket (401), the sliding groove (406) is opened on the surface of the mounting bracket (401), and the anti-slip texture (407) is formed on the clamping surface of the positioning plate (403).

3. The injection molding machine clamping mechanism according to claim 1, characterized in that: Motors (402) are fixedly installed on the mating surfaces of the fixed template (2) and the moving template (3). The connecting rod (405) is rotatably connected to one side of the turntable (404), and the connecting rod (405) is rotatably connected to the bottom of the positioning plate (403).

4. The injection molding machine clamping mechanism according to claim 2, characterized in that: The protrusion of the positioning plate (403) is slidably connected to the inside of the groove (406), and the positioning plate (403) moves along the inner wall trajectory of the groove (406).

5. The injection molding machine clamping mechanism according to claim 2, characterized in that: The anti-slip texture (407) has a wave-shaped structure and is used to disperse the pressure on the clamping surface of the positioning plate (403) and reduce stress concentration.

6. The injection molding machine clamping mechanism according to claim 1, characterized in that: The four positioning plates (403) in the close proximity state are used to clamp and position the mold, and the four positioning plates (403) in the far-away moving state are used to release the clamping and positioning of the mold.

7. The injection molding machine clamping mechanism according to claim 1, characterized in that: The locking mechanism (5) includes an electric push rod (501), a locking rod (503), and multiple lock holes (502); Electric push rods (501) are fixedly installed on the mating surfaces of the fixed template (2) and the moving template (3), and are located on one side of the motor (402). The lock hole (502) is opened on the surface of the turntable (404), and the lock rod (503) is fixedly connected to the output end of the electric push rod (501).

8. The injection molding machine clamping mechanism according to claim 7, characterized in that: The multiple lock holes (502) are arranged in a ring, and the output end of the electric push rod (501) after being energized is used to drive the lock rod (503) to move.

9. A mold clamping mechanism for an injection molding machine according to claim 7, characterized in that: The locking hole (502) is used for the locking rod (503) to be inserted into it, and the locking hole (502) and locking rod (503) in the engaged state are used to improve the stability of the rotational locking of the turntable (404).

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