A mold rotating device for an injection molding machine

Abstract

A mold rotating device of an injection molding machine, a movable mold rotating disk and a fixed back plate; a central fixed axis and a rotating shaft sleeve are arranged on the axis of the movable mold rotating disk, the movable mold rotating disk, the central fixed axis and the rotating shaft sleeve are coaxially matched with each other, and the rotating shaft sleeve is arranged to rotate relative to the central fixed axis; the central fixed axis is fixed on the fixed back plate, the rotating shaft sleeve is fixed on the movable mold rotating disk, and the rotating shaft sleeve rotates with the movable mold rotating disk; the central fixed axis and the rotating shaft sleeve are respectively provided with one or more liquid flow channel groups, and the liquid flow channel groups include one or more water flow channels and / or one or more oil flow channels and / or one or more air flow channels; the movable mold rotating disk rotates a certain angle relative to the fixed back plate, and the flow channels in at least one group of liquid flow channel groups on the central fixed axis correspond to the corresponding flow channels on the rotating shaft sleeve one by one and are connected to each other. The present invention has the characteristics of precise structure, high efficiency, high degree of automation, strong versatility, reliable performance, and can meet the characteristics of different molding processes.

Description

Technical Field

[0001] The invention relates to a multi-color injection molding machine, in particular to a mold rotating device of the injection molding machine. Background Art

[0002] Two-color (multi-color and multi-material) injection molding machines use two (multiple) independent injection mechanisms to plasticize two (multiple) different plastics in two (multiple) barrels respectively, and are equipped with corresponding two-color (multiple) molding technology equipment to work simultaneously or alternately to mold products composed of two (multiple) different colors or different plastics. With the development of modern design and application technology, two-color injection molding products are increasingly widely used in industries such as automotive parts and home appliances. In order to improve the quality and efficiency of molding, many injection molding manufacturers have put forward higher and higher requirements for multi-color molding technology. Multi-color application technology is closely related to mold structure, and the technology of realizing multi-color molding by rotating the movable mold to exchange the position of the mold cavity is currently a hot topic. However, the existing technology generally has problems such as difficult flow connection or easy leakage. For example, the turntable structure of the injection molding machine published on April 1, 2015 by Chinese patent document No. CN104476714A specifically discloses: including a bottom plate, a turntable, a rotating shaft, a cooling water distribution component, a power component, a positioning component, a limit component, an elastic rolling component, a protection component, a support component, and a hydraulic control component. The cooling water distribution component is composed of a front distribution plate, a rear distribution plate, a distribution plate cover and a diverter block; the power component is composed of a motor, a driving gear, an intermediate gear shaft, an intermediate gear, a rolling bearing, a motor seat, The drive motor housing is composed of the positioning cylinder assembly, the positioning oil cylinder and the positioning rod, the fixing seat, the induction block, and the positioning block; the limit assembly includes the limit rod and the limit inclined block; the protection assembly is composed of the left and right guard strips, the bottom guard strip, and the upper shield plate; the support wheel assembly is composed of only the support wheel, and the elastic rolling assembly includes the ball pressure cover, the ball support seat, the ball, the spring, the ball support, the fixing screw and the adjusting screw; the electrical and hydraulic components are composed of a separate valve plate and a corresponding control valve, which can be flexibly arranged on the moving plate of the main machine and connected to the drive motor and the positioning oil cylinder through a hose. This structure has the above-mentioned problems of difficult flow connection and easy leakage, so it is necessary to make further improvements. Summary of the invention

[0003] The purpose of the present invention is to provide a mold rotating device with precise structure, high efficiency, high degree of automation, strong versatility, reliable performance and capable of meeting different molding processes, so as to overcome the shortcomings of the prior art.

[0004] A mold rotating device of an injection molding machine designed for this purpose includes a servo motor, a movable mold rotating disk and a fixed back plate. The servo motor is fixedly arranged relative to the fixed back plate, and the movable mold rotating disk is positioned and rotated relative to the fixed back plate. The output shaft of the servo motor is connected to the movable mold rotating disk through a transmission component and drives the movable mold rotating disk to rotate; it is characterized in that: a central fixed axis and a rotating shaft sleeve are arranged on the axis of the movable mold rotating disk, the movable mold rotating disk, the central fixed axis and the rotating shaft sleeve are coaxially matched with each other, and the rotating shaft sleeve is relative to the center The fixed axis is arranged for rotation; the central fixed axis is fixed on the fixed back plate, the rotary shaft sleeve is fixed on the movable mold rotary disk, and the rotary shaft sleeve rotates with the movable mold rotary disk; the central fixed axis and the rotary shaft sleeve are respectively provided with one or more liquid flow channel groups, and the liquid flow channel groups include one or more water flow channels and / or one or more oil flow channels and / or one or more air flow channels; the movable mold rotary disk rotates a certain angle relative to the fixed back plate, and the flow channels in at least one group of liquid flow channel groups on the central fixed axis correspond to the corresponding flow channels on the rotary shaft sleeve one by one and are connected to each other.

[0005] The movable mold rotating disk and the fixed back plate are respectively provided with one or more flow channel joint groups, and the flow channel joint groups include one or more water joints and / or one or more oil joints and / or one or more ventilation joints; the water joint on the fixed back plate is connected with the water flow channel on the central fixed axis, the oil joint is connected with the oil flow channel on the central fixed axis, and the ventilation joint is connected with the air flow channel on the central fixed axis; the water joint on the movable mold rotating disk is connected with the water flow channel on the rotating shaft sleeve, the oil joint is connected with the oil flow channel on the rotating shaft sleeve, and the ventilation joint is connected with the air flow channel on the rotating shaft sleeve.

[0006] The fixed back plate is provided with a positioning device, which includes a positioning oil cylinder and a latch pin. The cylinder body of the positioning oil cylinder is fixedly arranged relative to the fixed back plate, and the rod body is connected to the latch pin and drives the latch pin to move back and forth. A pin hole is provided on the movable mold turntable. When the movable mold turntable rotates to a certain position, the positioning oil cylinder drives the latch pin to insert into the pin hole.

[0007] The positioning device is provided with a first travel switch for detecting the sliding travel of the latch; the fixed back plate is provided with a second travel switch for detecting the rotation travel of the movable mold turntable.

[0008] A wear-resistant block is arranged between the movable mold rotating disk and the fixed back plate, and the wear-resistant block elastically presses the movable mold rotating disk to form a gap between the movable mold rotating disk and the fixed back plate.

[0009] The fixed back plate is provided with one or more first supporting bearings for supporting the movable mold rotating disk, and the first supporting bearings are located below the movable mold rotating disk.

[0010] A second supporting bearing for auxiliary supporting the movable mold rotating disk and / or a third supporting bearing for auxiliary supporting the rotating shaft sleeve are arranged between the movable mold rotating disk and the fixed back plate, and the second supporting bearing and the third supporting bearing are respectively coaxially matched with the movable mold rotating disk.

[0011] The fixed back plate is provided with one or more limit plates, the movable mold turntable is at least partially covered by the limit plates, a rolling bearing is provided between the limit plates and the movable mold turntable, and the rolling direction of the rolling bearing is tangent to the rotation track of the movable mold turntable.

[0012] The transmission assembly includes a planetary reduction box and a gear set consisting of one or more gears meshing with each other. An annular rack is provided on the movable mold turntable. A corresponding gear in the gear set meshes with the annular rack. The servo motor drives the movable mold turntable to rotate through the planetary reduction box and the gear set.

[0013] The mold rotating device of the present invention adopts a servo motor to realize the rotation of the movable mold rotating disk through a transmission component. The injection movable mold is installed on the movable mold rotating disk and rotates with the movable mold rotating disk to realize the rotation of the injection movable mold, thereby realizing multi-color and multi-material injection molding. In order to ensure that the water and / or oil and / or gas required for the injection molding process can flow normally and smoothly, the structure is provided with a central fixed axis and a rotating shaft sleeve with a liquid flow channel group, which cooperates with the movable mold rotating disk and the pipelines on the fixed back plate to realize the distribution of water and / or oil and / or gas required in the injection molding process, thereby meeting the production process requirements of multi-color injection molds. It can be seen that the mold rotating device has a precise structure, high efficiency, high degree of automation, strong versatility, reliable performance, and can meet the characteristics of different molding processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional diagram of an assembly state of an embodiment of the present invention.

[0015] Figure 2 This is a front view of an assembly state of an embodiment of the present invention.

[0016] Figure 3 This is a rear view of an assembled state of an embodiment of the present invention.

[0017] Figure 4 It is a right side view of the assembled state of one embodiment of the present invention.

[0018] Figure 5 It is a left side view of the assembled state of one embodiment of the present invention.

[0019] Figure 6 FIG. 1 is a top view of an assembled state of an embodiment of the present invention.

[0020] Figure 7 This is a bottom view of an assembled state of an embodiment of the present invention.

[0021] Figure 8 for Figure 2 Cross-sectional view along the AA direction.

[0022] Fig. 9 for Figure 2 An enlarged schematic diagram of the rotation state at position B in the middle.

[0023] Fig.10 for Figure 2 An enlarged schematic diagram of the positioning state at position B in the middle.

[0024] Fig.11 for Figure 8 Enlarged schematic diagram of point C in the middle.

[0025] Fig.12 for Figure 8 Enlarged schematic diagram of point D in the middle. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] See also Figure 1-Figure 12 The mold rotating device of the injection molding machine includes a servo motor 1, a movable mold rotating disk 5 and a fixed back plate 11. The servo motor 1 is fixed to the rear side of the fixed back plate 11, the movable mold rotating disk 5 is positioned and rotated on the front side of the fixed back plate 11, and one or more injection movable molds are installed on the movable mold rotating disk 5. The output shaft of the servo motor 1 is connected to the movable mold rotating disk 5 through a transmission component, and drives the movable mold rotating disk 5 to rotate, thereby realizing the rotation of the injection movable mold; wherein, the servo motor 1 is the power element of the structure, which is used to drive and control the torque and speed of the movable mold rotating disk 5, and realize the precise control of the position of the movable mold rotating disk 5. The fixed back plate 11 can also be installed to accommodate other parts and components required for the precise, efficient, stable and reliable operation of the movable mold rotating disk 5; in order to ensure that the water, oil and gas required for the injection molding process can flow normally and smoothly, a central fixed axis 9 and a rotating shaft sleeve 10 are arranged on the axis of the movable mold rotating disk 5. The turntable 5, the central fixed axis 9 and the rotary sleeve 10 are coaxially matched with each other, and the rotary sleeve 10 is sleeved on the surface of the central fixed axis 9 and can rotate relative to the central fixed axis 9; the central fixed axis 9 is fixed to the front side of the fixed back plate 11, the rotary sleeve 10 is fixed to the rear side of the movable mold turntable 5, and the rotary sleeve 10 rotates with the movable mold turntable 5; the central fixed axis 9 and the rotary sleeve 10 are respectively provided with one or more liquid flow channel groups, and the liquid flow channel group includes one or more water flow channels, one or more oil flow channels and one or more air flow channels; when rotating, the movable mold turntable 5 rotates a certain angle relative to the fixed back plate 11, and the flow channels in at least one group of liquid flow channel groups on the central fixed axis 9 correspond to the corresponding flow channels on the rotary sleeve 10 one by one and are connected to each other, and then cooperate with the pipelines on the movable mold turntable 5 and the fixed back plate 11 to realize the distribution of water, oil and gas required in the injection molding process, thereby meeting the production process requirements of multi-color injection molds.

[0028] Furthermore, a flow channel joint group 20 is provided on both sides of the fixed back plate 11 and both sides of the movable mold rotating disk 5, and the flow channel joint group 20 includes more than one water-passing joint, more than one oil-passing joint and more than one ventilation joint; the water-passing joint on the fixed back plate 11 is connected to the corresponding water-transporting flow channel on the central fixed axis 9, the oil-passing joint is connected to the corresponding oil-transporting flow channel on the central fixed axis 9, and the ventilation joint is connected to the corresponding air-transporting flow channel on the central fixed axis 9; the water-passing joint on the movable mold rotating disk 5 is connected to the corresponding water-transporting flow channel on the rotating shaft sleeve 10, the oil-passing joint is connected to the corresponding oil-transporting flow channel on the rotating shaft sleeve 10, and the ventilation joint is connected to the corresponding air-transporting flow channel on the rotating shaft sleeve 10. After the rotating shaft sleeve 10 in this structure rotates a certain angle with the movable mold rotating disk 5, the liquid flow channel group on the rotating shaft sleeve 10 will correspond to the corresponding liquid flow channel group on the central fixed axis 9, so that the flow channels are connected to each other, thereby ensuring that the water, oil and gas required for the injection molding process can flow normally and smoothly.

[0029] Furthermore, a positioning device 12 is provided on the upper part of the fixed back plate 11, and the positioning device 12 includes a positioning cylinder 12.1 and a latch 12.2. The cylinder body of the positioning cylinder 12.1 is fixedly arranged relative to the fixed back plate 11, and the rod body is connected to the latch 12.2 and drives the latch 12.2 to reciprocate. The reciprocating trajectory of the latch 12.2 is radially arranged relative to the rotation trajectory of the movable mold turntable 5; the movable mold turntable 5 is provided with a pin hole 5.2 (the pin hole 5.2 can be integrally processed by the movable mold turntable 5, and can also be arranged on an insert for replacement and maintenance). When the movable mold turntable 5 rotates to a certain position, the positioning cylinder 12.1 drives the latch 12.2 to insert into the pin hole 5.2 to position and limit the movable mold turntable 5 to prevent it from rotating due to external force during operation.

[0030] Furthermore, a first travel switch 13 for detecting the sliding travel of the latch 12.2 is provided on one side of the positioning device 12; a second travel switch 18 for detecting the rotation travel of the movable mold rotary plate 5 is provided on one side of the fixed back plate 11. Each travel switch can effectively detect the travel displacement of the object and feed back to the control system so as to take corresponding measures in a timely and accurate manner.

[0031] Furthermore, a wear-resistant block 16 is arranged between the movable mold turntable 5 and the fixed back plate 11, and a butterfly spring 17 is arranged between the wear-resistant block 16 and the fixed back plate 11, so that the wear-resistant block 16 elastically presses the rear side of the movable mold turntable 5, and then a gap is formed between the movable mold turntable 5 and the fixed back plate 11, so as to prevent the movable mold turntable 5 from being stuck, stuck or having excessive friction after high-pressure clamping; wherein, the wear-resistant block 16 is a copper plate or other flat self-lubricating bearing.

[0032] Furthermore, two first supporting bearings 19 for supporting the movable mold turntable 5 are symmetrically arranged at the lower front side of the fixed back plate 11. The first supporting bearings 19 are located below the movable mold turntable 5. The first supporting bearings can effectively assist in supporting the movable mold turntable 5, reduce friction, and improve rotation smoothness.

[0033] Furthermore, a second supporting bearing 7 for auxiliary support of the movable mold rotating disk 5 and a third supporting bearing 8 for auxiliary support of the rotating sleeve 10 are arranged between the movable mold rotating disk 5 and the fixed back plate 11. The second supporting bearing 7 and the third supporting bearing 8 are respectively coaxially matched with the movable mold rotating disk 5; in addition, a bearing ring 6 is also arranged outside the second supporting bearing 7. The bearing ring 6 is connected and fastened to the movable mold rotating disk 5 by screws, and is tightly matched with the outer ring of the second supporting bearing 7. Among them, the second supporting bearing 7 is the main bearing element of the present structure, which can reduce the friction coefficient during the rotation of the movable mold rotating disk 5 and ensure its rotation accuracy; the third supporting bearing 8 is conducive to reducing the wear between the central fixed axis 9 and the rotating sleeve 10, ensuring the service life and sealing reliability.

[0034] Furthermore, six limiting plates 14 of different shapes are distributed in a ring on the front side of the fixed back plate 11, and the movable mold turntable 5 is at least partially covered by the limiting plates 14. A rolling bearing 15 is arranged between the limiting plates 14 and the movable mold turntable 5. The rolling direction of the rolling bearing 15 is tangent to the rotation trajectory of the movable mold turntable 5. The rolling bearing 15 can also reduce the friction coefficient of the movable mold turntable 5 during the rotation process.

[0035] Furthermore, the transmission assembly includes a planetary reduction box 2, and a gear set consisting of a driving gear 3 and a transmission gear 4 meshing with each other. The surface of the movable mold turntable 5 is provided with an annular rack 5.1 in an integrated or split manner. The transmission gear 4 in the gear set meshes with the annular rack 5.1. The servo motor 1 drives the movable mold turntable 5 to rotate through the planetary reduction box 2 and the gear set; the annular rack 5.1 protrudes from the surface of the movable mold turntable 5, and each limit plate 14 covers a portion of the annular rack 5.1 to limit the entire movable mold turntable 5. Among them, the planetary reduction box 2 is a transmission device between the servo motor 1 and the gear set. Through a suitable reduction ratio and output torque, it plays a role in matching the rotation speed and transmitting torque, achieving reliable accuracy and high torque.

[0036] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for illustrating the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A mold rotating device for an injection molding machine, comprising a servo motor (1), a movable mold rotating disk (5) and a fixed back plate (11), wherein the servo motor (1) is fixedly arranged relative to the fixed back plate (11), and the movable mold rotating disk (5) is positioned and rotated relative to the fixed back plate (11), and the output shaft of the servo motor (1) is connected to the movable mold rotating disk (5) through a transmission assembly, and drives the movable mold rotating disk (5) to rotate; characterized in that: A central fixed shaft (9) and a rotary shaft sleeve (10) are arranged on the axis of the movable mold rotary disk (5); the movable mold rotary disk (5), the central fixed shaft (9) and the rotary shaft sleeve (10) are coaxially matched with each other; the rotary shaft sleeve (10) is sleeved on the surface of the central fixed shaft (9), and the rotary shaft sleeve (10) is rotatably arranged relative to the central fixed shaft (9); the central fixed shaft (9) is fixed on the fixed back plate (11), the rotary shaft sleeve (10) is fixed on the movable mold rotary disk (5), and the rotary shaft sleeve (10) rotates with the movable mold rotating disk (5); at least one group of liquid flow channel groups are respectively provided on the central fixed shaft (9) and the rotating shaft sleeve (10), and the liquid flow channel group includes at least one water flow channel and / or at least one oil flow channel and / or at least one air flow channel; the movable mold rotating disk (5) rotates at a certain angle relative to the fixed back plate (11), and the flow channels in at least one group of liquid flow channel groups on the central fixed shaft (9) correspond to the corresponding flow channels on the rotating shaft sleeve (10) one by one and are connected to each other; The movable mold rotating disk (5) and the fixed back plate (11) are respectively provided with one or more flow channel joint groups (20), and the flow channel joint groups (20) include one or more water-passing joints and / or one or more oil-passing joints and / or one or more ventilation joints; the water-passing joint on the fixed back plate (11) is connected to the water-transporting flow channel on the central fixed shaft (9), the oil-passing joint is connected to the oil-transporting flow channel on the central fixed shaft (9), and the ventilation joint is connected to the air-transporting flow channel on the central fixed shaft (9); the water-transporting joint on the movable mold rotating disk (5) is connected to the water-transporting flow channel on the rotating shaft sleeve (10), the oil-transporting joint is connected to the oil-transporting flow channel on the rotating shaft sleeve (10), and the ventilation joint is connected to the air-transporting flow channel on the rotating shaft sleeve (10); The fixed back plate (11) is provided with a positioning device (12), the positioning device (12) comprising a positioning oil cylinder (12.1) and a latch pin (12.2); the cylinder body of the positioning oil cylinder (12.1) is fixedly arranged relative to the fixed back plate (11), the rod body is connected to the latch pin (12.2) and drives the latch pin (12.2) to reciprocate; the movable mold rotating disk (5) is provided with a pin hole (5.2), and when the movable mold rotating disk (5) rotates to a certain position, the positioning oil cylinder (12.1) drives the latch pin (12.2) to be inserted into the pin hole (5.2).

2. The mold rotating device of the injection molding machine according to claim 1, characterized in that: The positioning device (12) is provided with a first travel switch (13) for detecting the sliding travel of the latch (12.2); the fixed back plate (11) is provided with a second travel switch (18) for detecting the rotation travel of the movable mold rotary disk (5).

3. The mold rotating device of the injection molding machine according to claim 2, characterized in that: A wear-resistant block (16) is arranged between the movable mold rotating disk (5) and the fixed back plate (11), and the wear-resistant block (16) elastically presses the movable mold rotating disk (5) or the fixed back plate (11) to form a gap between the movable mold rotating disk (5) and the fixed back plate (11).

4. The mold rotating device of the injection molding machine according to claim 3 is characterized in that: The fixed back plate (11) is provided with one or more first supporting bearings (19) for supporting the movable mold rotating disk (5), and the first supporting bearings (19) are located below the movable mold rotating disk (5).

5. The mold rotating device of the injection molding machine according to claim 4, characterized in that: A second supporting bearing (7) for auxiliary supporting the movable mold rotating disk (5) and / or a third supporting bearing (8) for auxiliary supporting the rotating shaft sleeve (10) are arranged between the movable mold rotating disk (5) and the fixed back plate (11); the second supporting bearing (7) and the third supporting bearing (8) are respectively coaxially matched with the movable mold rotating disk (5).

6. The mold rotating device of the injection molding machine according to claim 5, characterized in that: The fixed back plate (11) is provided with one or more limit plates (14), and the movable mold rotating disk (5) is at least partially covered by the limit plates (14). A rolling bearing (15) is provided between the limit plates (14) and the movable mold rotating disk (5), and the rolling direction of the rolling bearing (15) is tangent to the rotation track of the movable mold rotating disk (5).

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