Safety cover and vertical injection molding device

Abstract

The invention provides a safety cover easy to maintain and an injection molding device with the safety cover. The safety cover (6) is provided with: a lower cover (40) attached to a movable plate (5) on which a lower mold (7) is provided; and an upper cover (41) provided above the lower cover (40). The upper cover (41) comprises: a fixed cover (41A); a lifting cover (41B) attached to the fixed cover (41A) so as to be movable in the vertical direction; and a holding means for holding the vertical position of the lifting cover (41). And a lifting means for lifting the lifting cover (41B).

Description

Technical Field

[0001] The invention relates to a safety cover of a vertical injection molding device. Background Art

[0002] Patent Document 1 discloses a vertical injection molding apparatus comprising an injection unit, a rotating table rotatably mounted on a fixed plate, and a mold clamping unit comprising a lower mold disposed on the rotating table and an upper mold vertically movable above the lower mold. The vertical injection molding apparatus is equipped with a safety cover to prevent the operator's body from being pinched by the mold during the mold clamping process.

[0003] The safety cover of Patent Document 1 includes a lower cover that is attached to the upper surface of a turntable and rotates together with the turntable, and an upper cover that is provided above the lower cover and fixed to a lower platen.

[0004] In addition, in a modified example of Patent Document 1, the safety cover has a lifting cover that is raised and lowered together with the upper platen, and the lifting cover includes: a fixed cover that is fixed to the upper platen and protrudes downward from the upper platen; and a movable cover that is suspended from the fixed cover in a manner that allows upward movement.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-177683 Summary of the Invention

[0008] Since the safety cover of the prior art includes a lower cover fixed to the rotating table and an upper cover fixed to the lower platen, there is a problem that the upper cover has to be installed and removed when replacing the mold or adjusting and maintaining the mold clamping device, resulting in poor maintainability.

[0009] In addition, since the safety cover involved in the modified example of the prior art includes a fixed cover fixed to the upper platen and protruding downward from the upper platen, and a movable cover suspended from the fixed cover in a manner that can move upward, there is a problem of poor maintainability because the fixed cover and the movable cover have to be installed and removed when replacing the mold or adjusting and repairing the mold clamping device.

[0010] An object of the present invention is to provide a safety cover that is easy to maintain and an injection molding device having the safety cover.

[0011] The present invention is a safety cover provided in a vertical injection molding device including a frame, an injection device and a mold clamping device. The safety cover is characterized in that it comprises:

[0012] a lower cover mounted on a setting table for setting the lower mold; and an upper cover disposed above the lower cover.

[0013] The upper cover includes: a fixed cover fixed to the frame; a lifting cover mounted on the fixed cover in a manner that can slide in the vertical direction; and a holding unit that holds the vertical position of the lifting cover.

[0014] A lifting unit is provided for lifting and lowering the lifting cover.

[0015] In addition, the present invention is characterized in that a guide groove extending in the vertical direction is formed in the fixed cover.

[0016] The lifting cover is provided with a slider which moves along the guide groove.

[0017] Furthermore, the present invention provides an injection molding device including the safety cover.

[0018] Effects of the Invention

[0019] According to the present invention, the safety cover includes a lower cover mounted on a mounting table and an upper cover mounted above the lower cover. The upper cover includes a fixed cover fixed to a frame, a lift cover mounted to the fixed cover so as to be slidable in the vertical direction, a holding unit for maintaining the vertical position of the lift cover, and a lift unit for raising and lowering the lift cover. Therefore, the lift cover can be raised and lowered and retracted upward when replacing molds or adjusting or maintaining the mold clamping device. This makes it easy to ensure adequate working space for operators, thereby providing a safety cover that is easy to maintain.

[0020] Furthermore, according to the present invention, the fixed cover is provided with a guide groove extending in the vertical direction, and the lift cover is provided with a slider that moves along the guide groove. This allows the lift cover to slide smoothly, thereby providing a safety cover that is easy to maintain.

[0021] Furthermore, according to the present invention, the injection molding apparatus includes the safety cover, and therefore, it is possible to provide an injection molding apparatus including a safety cover that is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view showing the appearance of an injection molding device.

[0023] Figure 2 It is a top view of the injection molding device.

[0024] Figure 3 This is a longitudinal sectional view of the safety cover 6 and its vicinity as viewed from the rear.

[0025] Figure 4It is a schematic side view showing a modified example of the injection molding apparatus.

[0026] Figure 5 It is a schematic plan view showing a modified example of the injection molding apparatus.

[0027] Description of Reference Numerals

[0028] 1 Injection molding device

[0029] 2 Framework

[0030] 3 Injection device

[0031] 4. Clamping device

[0032] 5 movable plates

[0033] 6 Safety cover

[0034] 7 Lower die

[0035] 8 Setting Station

[0036] 32 flat bar

[0037] 40 Lower hood

[0038] 41 Upper cover

[0039] 41A fixed cover

[0040] 41B lifting cover

[0041] 42 guide slots

[0042] 43 Slider

[0043] 50 Chain

[0044] 51 cylinders

[0045] P Clamping area

[0046] Q Take out area

[0047] S Middle Area

[0048] 100 Injection molding device DETAILED DESCRIPTION

[0049] Figure 1 It is a perspective view showing the appearance of an injection molding apparatus 1 according to an embodiment of the present invention. Figure 2 1 is a top view of the injection molding apparatus 1. In the following description, when the injection molding apparatus 1 is viewed from the front, the front-back direction is defined as the X direction, the left-right direction perpendicular to the X direction and horizontal to the Y direction is defined as the Y direction, and the vertical direction perpendicular to the X and Y directions is defined as the Z direction.

[0050] The injection molding apparatus 1 includes a frame 2, an injection device 3, and a mold clamping device 4. The injection molding apparatus 1 is a vertical injection molding apparatus provided so that the injection device 3 extends in the Z direction.

[0051] The frame 2 includes vertical frames 20, which form the outer shell of the injection molding apparatus 1 and extend in the Z direction, and wall members 21, which are provided between the vertical frames 20. Furthermore, the injection molding apparatus 1 includes safety doors 22 adjacent to the wall members 21. The safety doors 22 are provided along the Y direction of the injection molding apparatus 3 when viewed from the front. The safety doors 22 are hinged to allow for free opening and closing, preventing workers from entering the mold clamping area P.

[0052] The injection device 3 is a device for injecting molten resin into the cavity defined by the upper mold and the lower mold 7. The injection device 3 is located in the mold clamping area P and is provided above the movable plate 5 described later (see FIG. Figure 2 ).

[0053] The mold clamping device 4 opens and closes the upper mold by raising and lowering the upper platen, securing the upper and lower molds 7 and preventing them from opening due to the pressure of the injected resin. The mold clamping device 4 comprises an upper platen, to which the upper mold is mounted, and a movable platen 5, to which the lower mold 7 is mounted. The upper platen is movable to a closed position, where the upper mold abuts the lower mold 7, and an open position, where the upper mold retreats upward.

[0054] The movable plate 5 is rotatable around the rotation axis R by receiving torque from a driving source. A center column 30 extending in the Z direction is provided at the center of the movable plate 5. The movable plate 5 rotates around the rotation axis R with the center column 30 as an axis.

[0055] like Figure 2 As shown, the injection molding apparatus 1 includes a takeout area Q formed on one (forward) side of the center column 30 in the X direction, and a mold clamping area P formed on the other (rear) side of the takeout area Q in the X direction. A safety cover 6 is provided in an intermediate area S between the takeout area Q and the mold clamping area P.

[0056] The safety cover 6 is a device that prevents the operator's body from entering the mold clamping area P from the removal area Q. The safety cover 6 is provided to prevent the operator's body from entering the mold clamping area P and being caught by the mold during the mold clamping process.

[0057] Figure 3 This is a longitudinal sectional view of the vicinity of the safety cover 6 as viewed from the rear. The safety cover 6 includes a lower cover 40 mounted on a mounting table for mounting the lower mold 7 , that is, a movable plate 5 , and an upper cover 41 mounted above the lower cover 40 .

[0058] The lower cover 40 is a plate-shaped cover that rises in the Z direction and extends in the XY plane. A pair of lower covers 40 are formed with the same shape, centered on the central column 30. Therefore, even if the movable plate 5 rotates 180° from the 0° position, the other lower cover 40 remains below the upper cover 41. This ensures that even if the lower mold 7, mounted on the movable plate 5, is rotated 180° from the mold clamping area P to the removal area Q, the lower cover 40 remains positioned below the upper cover 41.

[0059] The upper cover 41 includes a fixed cover 41A fixed to the frame 2 and a lift cover 41B attached to the fixed cover 41A so as to be slidable in the Z direction.

[0060] The fixed cover 41A is formed in a plate shape, and each end portion in the Y direction is fixed to the frame 2. A guide groove 42 having a concave cross section and extending in the Z direction is formed at each end portion in the Y direction of the fixed cover 41A.

[0061] The lifting cover 41B has the same shape as the fixed cover 41A, with sliders 43 mounted at each end in the Y direction, each engaging a guide groove 42. The lifting cover 41B has multiple openings 44 extending through the thickness of the cover. Transparent members are embedded in the openings 44. The openings 44 allow observation of the mold clamping area P from the removal area Q.

[0062] A flat bar 32 extending in the Y direction is fixed to the lift cover 41B. The flat bar 32 is connected to one end of the chain 50 .

[0063] A locked air cylinder 51, serving as a holding unit for maintaining the Z-direction position of the lifting cover 41B, is attached to the base end of the flat bar 32. The air cylinder 51 is raised by receiving air from a source (not shown). Furthermore, the air cylinder 51 is lowered by releasing air from a discharge valve. The raising and lowering of the air cylinder 51 causes the flat bar 32 to move in the Z-direction.

[0064] The movement of the flat bar 32 causes the lift cover 41B to slide in the Z direction. The air supply to the air cylinder 51 and the opening and closing of the exhaust valve are controlled by control signals from the control unit. Since the air cylinder 51 has a locking mechanism, the air pressure is controlled based on the control signal, thereby fixing the position in the Z direction. The locking mechanism acts as a holding element.

[0065] A transverse frame 52 extending in the Y direction is provided above the fixed cover 41A. Two rollers 53 are mounted on the transverse frame 52 at intervals in the Y direction. A weight storage portion 54 extending in the Z direction is provided at the base end of the transverse frame 52. The weight storage portion 54 is a hollow body in the shape of a quadrangular prism or a cylinder, and has a storage space formed therein for accommodating a counterweight 55. The locking mechanism is implemented, for example, by a solenoid valve that regulates the flow of air into and out of the cylinder.

[0066] A counterweight 55 is housed within the hammer housing 54. An opening for inserting the chain 50 is formed in the upper cover of the hammer housing 54. One end of the chain 50 is connected to the flat bar 32 and inserted through the opening via two rollers 53. The other end of the chain 50 is connected to the counterweight 55. The connection with the counterweight 55 allows the lifting cover 41B to slide smoothly along the guide groove 42.

[0067] The safety cover 6 has the above-described structure, so the lifting cover 41B can be moved in the Z direction and maintained at a desired position in the Z direction. Therefore, when replacing the mold or adjusting or maintaining the mold clamping device 4, the lifting cover 41B can be raised and lowered and retracted upward.

[0068] Furthermore, when the height position of the lower mold 7 is changed due to mold replacement, the Z-direction position of the lift cover 41B can be adjusted to reliably separate the removal area Q from the mold clamping area P. This makes it easy to ensure a workspace for the operator, thus providing a safety cover 6 that is easy to maintain.

[0069] Furthermore, the safety cover 6 includes guide grooves 42 and sliders 43 that fit into the guide grooves 42. This eliminates play at either end in the Y direction, allowing the lift cover 41B to slide smoothly along the guide grooves 42. This allows the lift cover 41B to be accurately moved in the Z direction and held in a desired position, thus providing an easily maintainable safety cover 6. The injection molding apparatus 1 includes the safety cover 6, thereby achieving an injection molding apparatus having an easily maintainable safety cover.

[0070] In this embodiment, the lift cover 41B is slid by the air cylinder 51 as a lifting unit, but the present invention is not limited to this structure. For example, the flat bar 32 may be moved in the Z direction using a pulley, a wire, or a winder. Alternatively, the lift cover 41B may be moved using a hydraulic lifting unit and provided with a locking mechanism to maintain the desired position.

[0071] Figure 4 is a schematic side view showing a modified example of the injection molding device, Figure 51 is a schematic plan view showing a modified example of the injection molding apparatus. In the above-described embodiment, the injection molding apparatus 1 has a structure including the movable plate 5 as a setting table, but the present invention is not limited thereto.

[0072] The injection molding apparatus 100 has a setting table 8. Figure 4 and Figure 5 As shown, the safety cover 6 is provided in the intermediate area S between the mold clamping area P and the removal area Q. The structure of the safety cover 6 is the same as that of the injection molding apparatus 1, and therefore, description thereof will be omitted.

[0073] The installation table 8 is slidable in the X direction. The installation table 8 can move from the mold clamping area P to the intermediate area S and then to the removal area Q. The safety cover 6 can also be used for an injection molding apparatus having a sliding installation table 8 such as the injection molding apparatus 100 .

Claims

1. A safety cover provided in a vertical injection molding device comprising a frame, an injection device, and a mold clamping device, wherein the safety cover is characterized in that it comprises: a lower cover mounted on a setting table for setting the lower mold; and an upper cover, which is arranged above the lower cover, The upper cover includes: a fixed cover fixed to a frame; a lifting cover mounted on the fixed cover in a manner movable in an up-down direction; and a holding unit that holds the up-down position of the lifting cover. A lifting unit is provided for lifting and lowering the lifting cover.

2. The safety cover according to claim 1, characterized in that: The fixed cover is formed with a guide groove extending in the up-down direction. The lifting cover is provided with a slider which moves along the guide groove.

3. An injection molding device, characterized in that: A safety cover according to claim 1 or 2.

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