Mold locking mechanism of mold closing system of injection molding machine

Abstract

The utility model discloses a mold locking mechanism of a mold closing system of an injection molding machine. The mold locking mechanism comprises a machine table, a fixed plate, a movable plate, a fixed module, a movable module, a hydraulic mold closing device and a bottom plate, after the movable die set and the fixed die set are combined, the first split and the second split are combined to form the locking column, the locking sleeve with the adjusted position is driven by the extending shaft of the second air cylinder to move towards the locking column, the locking sleeve is driven by the motor to rotate and is in threaded connection with the locking column while moving, and the first split and the second split are fixed together through the locking sleeve. The mold locking capacity can be improved on the basis that the hydraulic pressure of the mold locking hydraulic cylinder is not increased, the product production quality is effectively improved, the bottom plate is detachably connected, the driving box can move left and right along the first sliding rail, and therefore the left-right position of the driving box can be conveniently adjusted according to the mold closing centers of the movable mold sets and the fixed mold sets of different sizes; the position is convenient to adjust, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a mold clamping mechanism of a mold clamping system of an injection molding machine. Background Art

[0002] In the prior art, a mold clamping mechanism is provided during the mold clamping process of an injection molding machine. In the prior art, the mold clamping mechanism generally drives a connecting rod through an oil cylinder. For example, a disclosed technology discloses a mold clamping structure of an injection molding machine, including a hydraulic cylinder and a mold. The hydraulic cylinder is fixed on a base, and further includes a first locking rod and a second locking rod. During use, through the movement of the piston rod of the hydraulic rod, the connecting rod is pushed to move. When the connecting rod moves to a certain position, the first locking rod and the second locking rod are on the same straight line, and at this time, the mold clamping mechanism is locked. In addition, there is also a disclosed technology that proposes to increase a brake device on the moving plate guide column to improve the mold clamping force.

[0003] During the injection molding process, too small a mold clamping pressure will cause the mold to loosen due to the injection pressure when the mold is clamped, and when a larger pressure is provided by increasing the pressure of the hydraulic cylinder, too large a mold clamping pressure will cause damage to the mold. Therefore, on the basis of the existing mold clamping mechanism, it is necessary to optimize a new locking structure to improve the mold clamping ability and the quality of injection molding production without increasing the hydraulic pressure of the mold clamping hydraulic cylinder. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art, and to propose a mold clamping mechanism of a mold clamping system of an injection molding machine.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A mold clamping mechanism of a mold clamping system of an injection molding machine, including a machine table, a fixed plate, a movable plate, a fixed mold group, a movable mold group, a hydraulic mold clamping device and a bottom plate. The fixed plate is fixedly connected to the upper wall of the machine table. The movable plate is slidably connected to the upper wall of the machine table through the hydraulic mold clamping device and is located on the left side of the fixed plate. The fixed mold group and the movable mold group are respectively fixedly connected to the opposite sides of the fixed plate and the movable plate. The bottom plate is detachably connected to the upper wall of the machine table and is located in front of the fixed plate. A driving box is slidably connected to the upper wall of the bottom plate through a left-right translation driving structure. A rotating shaft is rotatably connected to the rear wall of the driving box in a penetrating manner. Locking sleeves are arranged at the ends of the rotating shaft facing the movable mold group and the fixed mold group. Locking columns are arranged on the front walls of the movable mold group and the fixed mold group for cooperating with the locking sleeves to improve the mold clamping force when the movable mold group and the fixed mold group are clamped. A sliding plate is slidably connected to the inner side wall of the driving box through a front-rear translation driving structure. A rotating driving structure for driving the rotating shaft to rotate is arranged on the upper wall of the sliding plate.

[0006] As a further description of the above technical solution:

[0007] One end of the locking sleeve away from the rotating shaft is provided with a docking hole. At the junction of the inner side wall of the docking hole and the end of the locking sleeve away from the rotating shaft, a transition arc is provided. The inner side wall of the docking hole is provided with an internal thread, and the internal thread is a rectangular thread.

[0008] As a further description of the above technical solution:

[0009] The locking column is composed of a first split and a second split. The first split and the second split are respectively fixedly connected to the front wall of the fixed die set and the front wall of the moving die set. When the fixed die set and the moving die set are combined, the first split and the second split are combined to form a cylindrical shape. The outer circumferential wall of the locking column is provided with an external thread, and the external thread is a rectangular thread.

[0010] As a further description of the above technical solution:

[0011] The left and right translation driving structure includes two groups of first slide rails and first sliders. The two groups of first slide rails are both fixedly connected to the upper wall of the bottom plate. The two groups of first sliders are respectively slidably connected to the upper walls of the two groups of first slide rails. The driving box is fixedly connected to the upper walls of the two groups of first sliders. A first air cylinder is fixedly connected to the upper wall of the bottom plate and between the two groups of first slide rails. The extending end of the first air cylinder is fixedly connected to the lower wall of the driving box through a connecting seat.

[0012] As a further description of the above technical solution:

[0013] The front and back translation driving structure includes a second air cylinder, a vertical plate, two groups of second slide rails and two groups of second sliders. The two groups of second slide rails are respectively fixedly connected to the inner left wall and the inner right wall of the driving box. The two groups of second sliders are respectively slidably connected between the opposite sides of the two groups of second slide rails. The sliding plate is fixedly connected to the upper walls of the two groups of second sliders. The vertical plate is fixedly connected to the upper wall of the sliding plate and is located near the front wall of the sliding plate. A sleeve is fixedly connected to the front wall of the vertical plate. The second air cylinder is fixedly connected to the front wall of the driving box through a support frame. The extending shaft of the second air cylinder sequentially penetrates the front wall of the driving box and the front end of the sleeve and extends into the sleeve. One end of the extending shaft of the second air cylinder extending into the sleeve is fixedly connected to a pull plate. A spring is sleeved on the outer wall of the extending shaft of the second air cylinder and between the front wall of the pull plate and the inner front wall of the sleeve.

[0014] As a further description of the above technical solution:

[0015] The rotation drive structure includes a motor, a speed reducer, and two sets of gears. The motor and the speed reducer are fixedly connected to the upper wall of the sliding plate in sequence from front to back. The output shaft of the motor and the input shaft of the speed reducer both penetrate the inner wall of the sliding plate and extend below the sliding plate. The two sets of gears are respectively fixedly connected to the outer walls of the ends of the output shaft of the motor and the input shaft of the speed reducer that extend below the sliding plate, and the outer walls of the two sets of gears mesh with each other. One end of the rotating shaft facing the drive box penetrates the rear wall of the drive box and extends into the drive box. The rotating shaft is movably connected to the rear wall of the drive box. One end of the rotating shaft extending into the drive box is fixedly connected to the end of the output shaft of the speed reducer through a coupling.

[0016] The utility model has the following beneficial effects:

[0017] 1. Compared with the prior art, for the clamping mechanism of the injection molding machine's mold closing system, after the moving mold group and the fixed mold group are closed, the first split flap and the second split flap are combined into a locking column. The locking sleeve adjusted to the correct position is driven by the extending shaft of the second cylinder to move towards the locking column. During the movement, the motor drives the locking sleeve to rotate and threadedly connect with the locking column. The first split flap and the second split flap are fixed together by the locking sleeve, which can improve the clamping ability without increasing the hydraulic pressure of the clamping hydraulic cylinder, and effectively improve the production quality of the product.

[0018] 2. Compared with the prior art, for the clamping mechanism of the injection molding machine's mold closing system, the detachable connection method of the bottom plate and the setting that the drive box can move left and right along the first slide rail are to facilitate adjusting the left and right positions of the drive box according to the mold closing centers of different-sized moving mold groups and fixed mold groups. The position adjustment is relatively convenient and has high practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the clamping mechanism of a mold closing system of an injection molding machine proposed by the present utility model;

[0020] Figure 2 FIG. 2 is a schematic diagram of the connection structure of the fixed plate, movable plate, moving mold group, fixed mold group, first split flap, and second split flap of the clamping mechanism of a mold closing system of an injection molding machine proposed by the present utility model;

[0021] Figure 3 FIG. 3 is a partial side cross-sectional view of the internal structure of the drive box of the clamping mechanism of a mold closing system of an injection molding machine proposed by the present utility model;

[0022] Figure 4 FIG. 4 is a Figure 3 partial enlarged view of A in FIG. 3 of the clamping mechanism of a mold closing system of an injection molding machine proposed by the present utility model.

[0023] LEGEND DESCRIPTION:

[0024] 1. Fixed plate; 2. Movable plate; 3. Fixed mold set; 4. Movable mold set; 5. First split; 6. Second split; 7. External thread; 8. Base plate; 9. First slide rail; 10. First cylinder; 11. First slider; 12. Drive box; 13. Support frame; 14. Second cylinder; 15. Second slide rail; 16. Second slider; 17. Sliding plate; 18. Vertical plate; 19. Motor; 20. Reducer; 21. Gear; 22. Rotating shaft; 23. Coupling; 24. Locking sleeve; 25. Docking hole; 26. Internal thread; 27. Sleeve; 28. Pulling plate; 29. Spring. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Referring to Figures 1 to 4 , a mold locking mechanism of an injection molding machine clamping system provided by the present invention includes a machine table, a fixed plate 1, a movable plate 2, a fixed mold set 3, a movable mold set 4, a hydraulic clamping device and a base plate 8. The fixed plate 1 is fixedly connected to the upper wall of the machine table. The movable plate 2 is slidably connected to the upper wall of the machine table through the hydraulic clamping device and is located on the left side of the fixed plate 1. The fixed mold set 3 and the movable mold set 4 are respectively fixedly connected to the opposite sides of the fixed plate 1 and the movable plate 2. In this embodiment, the fixed plate 1 and the movable plate 2 are also clamped by a hydraulic cylinder consistent with the prior art to provide a mold locking force. At the same time, a brake type mold locking consistent with other prior arts can also be set. The main improvement point of this embodiment is to provide a mold locking structure that can be newly added while using the above two mold locking structures to improve the mold locking force. The mold locking structure proposed in this embodiment can be provided with a set on the front and rear sides of the movable mold set 4 and the fixed mold set 3 respectively. For the convenience of explanation in this embodiment, only the mold locking structure provided on the front side of the movable mold set 4 and the fixed mold set 3 will be described in detail;

[0027] To facilitate the driving box 12 to adapt to different mold clamping center positions, the bottom plate 8 is detachably connected to the upper wall of the machine table and is located in front of the fixing plate 1. The upper wall of the bottom plate 8 is slidably connected with the driving box 12 through a left-right translation driving structure. The left-right translation driving structure includes two groups of first slide rails 9 and first sliders 11. Both groups of first slide rails 9 are fixedly connected to the upper wall of the bottom plate 8. The two groups of first sliders 11 are respectively slidably connected to the upper walls of the two groups of first slide rails 9. The driving box 12 is fixedly connected to the upper walls of the two groups of first sliders 11. A first cylinder 10 is fixedly connected to the upper wall of the bottom plate 8 and between the two groups of first slide rails 9. The protruding end of the first cylinder 10 is fixedly connected to the lower wall of the driving box 12 through a connecting seat. By extending and retracting the extending shaft of the first cylinder 10, the driving box 12 can be driven to translate left and right along the first slide rail 9 to adjust the left-right position of the locking sleeve 24 relative to the locking column. The horizontal height position between the locking sleeve 24 and the locking column has been fixed at the same height during production and does not need to be adjusted;

[0028] To achieve the mold clamping function for the moving mold unit 4 and the fixed mold unit 3, a rotating shaft 22 is rotatably connected to the rear wall of the driving box 12 in a penetrating manner. One end of the rotating shaft 22 facing the moving mold unit 4 and the fixed mold unit 3 is provided with a locking sleeve 24. One end of the locking sleeve 24 away from the rotating shaft 22 is provided with a docking hole 25. At the junction of the inner side wall of the docking hole 25 and the end of the locking sleeve 24 away from the rotating shaft 22, a transition arc is provided. The inner side wall of the docking hole 25 is provided with an internal thread 26. The internal thread 26 is a rectangular thread. The transition arc is for facilitating the introduction of the locking column into the docking hole 25.

[0029] To achieve the mold clamping function for the moving mold unit 4 and the fixed mold unit 3, the front walls of the moving mold unit 4 and the fixed mold unit 3 are provided with locking columns for cooperating with the locking sleeve 24 to improve the mold clamping force when the moving mold unit 4 and the fixed mold unit 3 are closed. The locking column is composed of a first split part 5 and a second split part 6. The first split part 5 and the second split part 6 are respectively fixedly connected to the front wall of the fixed mold unit 3 and the front wall of the moving mold unit 4. When the fixed mold unit 3 and the moving mold unit 4 are closed, the first split part 5 and the second split part 6 are combined to form a cylindrical shape. The outer circumferential wall of the locking column is provided with an external thread 7. The external thread 7 is a rectangular thread. When the fixed mold unit 3 and the moving mold unit 4 are closed, the first split part 5 and the second split part 6 are combined to form a cylindrical locking column. When the locking sleeve 24 is threadedly connected to the outer wall of the locking column, the mold clamping state of the fixed mold unit 3 and the moving mold unit 4 is formed through the locking sleeve 24, avoiding the phenomenon of product flash caused by the mold opening due to the injection pressure during injection molding, and at the same time, there is no need to additionally increase the hydraulic pressure of the original mold clamping hydraulic cylinder;

[0030] In order to achieve the forward and backward movement of the locking sleeve 24, a sliding plate 17 is slidably connected to the inner side wall of the driving box 12 through a front-back translation driving structure. The front-back translation driving structure includes a second air cylinder 14, a vertical plate 18, two groups of second slide rails 15 and two groups of second sliders 16. The two groups of second slide rails 15 are respectively fixedly connected to the left inner wall and the right inner wall of the driving box 12. The two groups of second sliders 16 are respectively slidably connected between the opposite sides of the two groups of second slide rails 15. The sliding plate 17 is fixedly connected to the upper walls of the two groups of second sliders 16. The vertical plate 18 is fixedly connected to the upper wall of the sliding plate 17 and is located near the front wall of the sliding plate 17. A sleeve 27 is fixedly connected to the front wall of the vertical plate 18. The second air cylinder 14 is fixedly connected to the front wall of the driving box 12 through a support frame 13. The extending shaft of the second air cylinder 14 sequentially penetrates through the front wall of the driving box 12, the front end of the sleeve 27 and extends into the interior of the sleeve 27. One end of the extending shaft of the second air cylinder 14 extending into the interior of the sleeve 27 is fixedly connected to a pull plate 28. A spring 29 is sleeved between the outer wall of the extending shaft of the second air cylinder 14 and the inner front wall of the sleeve 27 between the front wall of the pull plate 28. When the extending shaft of the second air cylinder 14 extends and retracts, it can drive the locking sleeve 24 to move backward and forward. The spring 29 is provided so that after the second air cylinder 14 drives the locking sleeve 24 to be docked with the locking column, the locking sleeve 24 can axially move forward and backward through the threaded connection relationship with the locking column and is not restricted by the second air cylinder 14;

[0031] In order to achieve the threaded connection between the locking sleeve 24 and the locking column, a rotation driving structure for driving the rotation of the rotating shaft 22 is provided on the upper wall of the sliding plate 17. The rotation driving structure includes a motor 19, a reducer 20 and two groups of gears 21. The motor 19 and the reducer 20 are sequentially fixedly connected to the upper wall of the sliding plate 17 in a front-back distribution. The extending shaft of the motor 19 and the input shaft of the reducer 20 both penetrate through the inner wall of the sliding plate 17 and extend below the sliding plate 17. The two groups of gears 21 are respectively fixedly connected to the outer wall of one end of the extending shaft of the motor 19 extending below the sliding plate 17 and the outer wall of one end of the input shaft of the reducer 20 extending below the sliding plate 17, and the outer walls of the two groups of gears 21 are meshed with each other. One end of the rotating shaft 22 facing the driving box 12 penetrates through the rear wall of the driving box 12 and extends into the interior of the driving box 12. The rotating shaft 22 is movably connected to the rear wall of the driving box 12, and the two are movably connected in a way that is both rotationally connected and slidably connected. One end of the rotating shaft 22 extending into the interior of the driving box 12 is fixedly connected to the end of the output shaft of the reducer 20 through a coupling 23. The locking sleeve 24 is driven by the extending shaft of the second air cylinder 14 to move backward until the orifice of the docking hole 25 abuts against the locking column. At this time, the motor 19 is started, and the reducer 20 is driven to rotate through the two groups of gears 21. After the motor 19 is decelerated and torque-increased by the reducer 20, the locking sleeve 24 is driven to rotate, thereby realizing the threaded connection action between the locking sleeve 24 and the locking column.

[0032] Working principle: When the shaft of the first cylinder 10 extends and retracts, it can drive the drive box 12 to move left and right along the first slide rail 9, so as to adjust the left and right positions of the locking sleeve 24 relative to the locking column. The horizontal height position between the locking sleeve 24 and the locking column has been fixed at the same height during production and does not need to be adjusted. When the fixed die set 3 and the moving die set 4 are clamped, the first split flap 5 and the second split flap 6 are combined to form a cylindrical locking column. When the locking sleeve 24 is threadedly connected to the outer wall of the locking column, the clamping state of the fixed die set 3 and the moving die set 4 is formed through the locking sleeve 24, which avoids the phenomenon of product flash caused by the demolding phenomenon due to the injection pressure during injection molding. At the same time, it is not necessary to additionally increase the hydraulic pressure of the original clamping hydraulic cylinder. When the shaft of the second cylinder 14 extends and retracts, it can drive the locking sleeve 24 to move backward and forward. The spring 29 is provided so that after the second cylinder 14 drives the locking sleeve 24 to dock with the locking column, the locking sleeve 24 can axially move back and forth through the threaded connection relationship with the locking column and is not restricted by the second cylinder 14. The locking sleeve 24 is driven by the extension of the shaft of the second cylinder 14 to move backward until the orifice of the docking hole 25 abuts against the locking column. At this time, the motor 19 is started, and the two sets of gears 21 drive the reducer 20 to rotate. After the motor 19 is decelerated and torque-increased by the reducer 20, it drives the locking sleeve 24 to rotate, thereby realizing the threaded connection action between the locking sleeve 24 and the locking column.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A clamping mechanism of a clamping system of an injection molding machine, characterized in that: The invention comprises a machine platform, a fixed plate (1), a movable plate (2), a fixed die group (3), a movable die group (4), a hydraulic mold clamping device and a bottom plate (8), wherein the fixed plate (1) is fixedly connected to the upper wall of the machine platform, the movable plate (2) is slidably connected to the upper wall of the machine platform through the hydraulic mold clamping device and is located on the left side of the fixed plate (1), the fixed die group (3) and the movable die group (4) are respectively fixedly connected to the opposite side of the fixed plate (1) and the movable plate (2), the bottom plate (8) is detachably connected to the upper wall of the machine platform and is located on the front side of the fixed plate (1), and the upper wall of the bottom plate (8) is slidably connected to a driving structure through a left-right translation driving structure. A box (12), the rear wall of the driving box (12) is rotatably connected to a rotating shaft (22) in a through-shaped manner, one end of the rotating shaft (22) facing the movable die group (4) and the fixed die group (3) is provided with a locking sleeve (24), the front walls of the movable die group (4) and the fixed die group (3) are provided with a locking column for cooperating with the locking sleeve (24) to increase the clamping force of the movable die group (4) and the fixed die group (3) when the mold is closed, the inner side wall of the driving box (12) is slidably connected to a sliding plate (17) through a front and rear translation driving structure, and the upper wall of the sliding plate (17) is provided with a rotating driving structure for driving the rotating shaft (22) to rotate.

2. The mold clamping mechanism of the mold clamping system of an injection molding machine according to claim 1, characterized in that: A docking hole (25) is provided at one end of the locking sleeve (24) away from the rotating shaft (22); a transition arc is provided at the intersection of the inner wall of the docking hole (25) and the end of the locking sleeve (24) away from the rotating shaft (22); an internal thread (26) is provided on the inner wall of the docking hole (25); and the internal thread (26) is a rectangular thread.

3. The mold locking mechanism of the mold clamping system of an injection molding machine according to claim 1, characterized in that: The locking column is composed of a first petal (5) and a second petal (6); the first petal (5) and the second petal (6) are respectively fixedly connected to the front wall of the fixed mold assembly (3) and the front wall of the movable mold assembly (4); when the fixed mold assembly (3) and the movable mold assembly (4) are molded together, the first petal (5) and the second petal (6) are combined to form a cylindrical shape; the outer circumferential wall of the locking column is provided with an external thread (7); the external thread (7) is a rectangular thread.

4. The mold locking mechanism of the mold clamping system of an injection molding machine according to claim 1, characterized in that: The left-right translation driving structure comprises two groups of first slide rails (9) and first sliders (11); the two groups of first slide rails (9) are fixedly connected to the upper wall of the base plate (8); the two groups of first sliders (11) are respectively slidably connected to the upper walls of the two groups of first slide rails (9); the driving box (12) is fixedly connected to the upper walls of the two groups of first sliders (11); a first cylinder (10) is fixedly connected to the upper wall of the base plate (8) and located between the two groups of first slide rails (9); and an extended end of the first cylinder (10) is fixedly connected to the lower wall of the driving box (12) via a connecting seat.

5. The mold locking mechanism of the mold clamping system of an injection molding machine according to claim 1, characterized in that: The front-rear translation driving structure comprises a second cylinder (14), a vertical plate (18), two groups of second slide rails (15) and two groups of second sliders (16); the two groups of second slide rails (15) are respectively fixedly connected to the inner left wall and the inner right wall of the driving box (12); the two groups of second sliders (16) are respectively slidably connected between opposite sides of the two groups of second slide rails (15); the sliding plate (17) is fixedly connected to the upper walls of the two groups of second sliders (16); the vertical plate (18) is fixedly connected to the upper wall of the sliding plate (17) and is located near the front wall of the sliding plate (17); The front wall of the vertical plate (18) is fixedly connected to a sleeve (27); the second cylinder (14) is fixedly connected to the front wall of the drive box (12) through a support frame (13); the extension shaft of the second cylinder (14) sequentially penetrates the front wall of the drive box (12) and the front end of the sleeve (27) and extends into the interior of the sleeve (27); one end of the extension shaft of the second cylinder (14) extending into the interior of the sleeve (27) is fixedly connected to a pull plate (28); a spring (29) is sleeved on the outer wall of the extension shaft of the second cylinder (14) and is located between the front wall of the pull plate (28) and the inner front wall of the sleeve (27).

6. The mold locking mechanism of the mold clamping system of an injection molding machine according to claim 1, characterized in that: The rotary drive structure comprises a motor (19), a reducer (20) and two sets of gears (21); the motor (19) and the reducer (20) are fixedly connected to the upper wall of the sliding plate (17) in a front-to-rear distribution; the motor (19) extension shaft and the reducer (20) input shaft both penetrate the inner wall of the sliding plate (17) and extend below the sliding plate (17); the two sets of gears (21) are respectively fixedly connected to the outer wall of one end of the motor (19) extension shaft extending below the sliding plate (17). The input shaft of the reducer (20) extends to the outer wall of one end below the sliding plate (17), and the outer walls of the two sets of gears (21) are meshed with each other. The end of the rotating shaft (22) facing the drive box (12) passes through the rear wall of the drive box (12) and extends into the interior of the drive box (12). The rotating shaft (22) is movably connected to the rear wall of the drive box (12). The end of the rotating shaft (22) extending into the interior of the drive box (12) is fixedly connected to the end of the output shaft of the reducer (20) through a coupling (23).

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