Molding machine

Abstract

To provide a technology for efficiently cooling the servo amplifier in an electric molding machine driven by a servo motor.SOLUTION: The molding machine comprises a clamping device for opening and closing the mold and clamping it; an injection device for injecting molding material into the cavity of the clamped mold; a servo motor for operating the molding machine; a servo amplifier for controlling the power supply to the servo motor; and a frame having an upper wall supporting the clamping device and injection device, and an internal space for housing the servo amplifier. The frame includes a first side wall and a second side wall disposed oppositely with respect to each other in a first direction perpendicular to the vertical direction, with the servo amplifier positioned between them. A first opening is formed in the first side wall. A second opening is formed in the second side wall at a position overlapping the servo amplifier when viewed from the first direction, and an exhaust fan for discharging air from the internal space is attached to the second opening.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a molding machine that injects a molding material into a mold to form a molded product. [Background technology]

[0002] Conventionally, molding machines have been known that include a mold clamping device that opens, closes, and clamps a mold, and an injection device that injects molding material into the cavity of the clamped mold. In recent years, electric molding machines driven by servo motors have been increasingly replacing hydraulic molding machines. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-146590 Summary of the Invention [Problem to be solved by the invention]

[0004] In electric molding machines, the servo amplifiers that control the power supply to the servo motors generate a large amount of heat, so measures to cool the servo amplifiers are important for stable operation of the molding machine.

[0005] The present invention has been made to solve the problems of the conventional technology, and its purpose is to provide a technology for efficiently cooling a servo amplifier in an electric molding machine driven by a servo motor. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a molding machine comprising a mold clamping device that opens, closes, and clamps a mold, and an injection device that injects molding material into the cavity of the clamped mold, the molding machine comprising: a servo motor that operates the molding machine; a servo amplifier that controls the supply of power to the servo motor; an upper wall that supports the mold clamping device and the injection device, and a frame having an internal space that accommodates the servo amplifier, the frame comprising a first side wall and a second side wall that are arranged opposite each other on either side of the servo amplifier in a first direction that is perpendicular to the up-down direction, the first side wall having a first opening, and the second side wall having a second opening at a position that overlaps with the servo amplifier when viewed from the first direction, and an exhaust fan that exhausts air from the internal space is attached to the second opening. [Effects of the Invention]

[0007] According to the present invention, in an electric molding machine driven by a servo motor, a servo amplifier can be efficiently cooled. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of an injection molding machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a hardware configuration diagram of an injection molding machine. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] 10 is a table comparing the temperatures of the servo amplifier when the combination and number of simple openings, exhaust fans, and intake fans provided in the front and rear walls are changed. DETAILED DESCRIPTION OF THE INVENTION

[0009] An injection molding machine 10 according to the present invention will be described below with reference to the drawings. The injection molding machine 10 is a device that injects a measured amount of molding material into a mold to form a molded product (hereinafter referred to as "injection molding"). However, a specific example of the molding machine is not limited to the injection molding machine 10, and may be an electric die-casting machine that injects molten metal (molding material) into a mold to form a molded product.

[0010] [Configuration of injection molding machine 10] FIG. 1 is a side view of an injection molding machine 10 according to this embodiment. FIG. 2 is a hardware configuration diagram of the injection molding machine 10. As shown in FIGS. 1 and 2, the injection molding machine 10 mainly includes a mold clamping unit 20, an injection unit 30, and a control unit 40. The injection molding machine 10 according to this embodiment is an electric type having servo motors (for example, a mold opening / closing motor 28, an ejector motor 29, an injection motor 37, and a metering motor 38) described below as drive sources.

[0011] The mold clamping device 20 opens, closes, and clamps the mold 21. Specifically, the mold clamping device 20 mainly includes a fixed die plate 23 that supports a fixed-side mold 22, and a movable die plate 25 that supports a movable-side mold 24. The fixed-side mold 22 and the movable-side mold 24 are supported so as to face each other in the left-right direction (horizontal direction) of the injection molding machine 10.

[0012] The movable die plate 25 moves left and right along the tie bars 27 as the driving force of the die opening / closing motor 28 is transmitted through the toggle link mechanism 26. When the movable die plate 25 moves leftward, the fixed-side die 22 and the movable-side die 24 move apart. On the other hand, when the movable die plate 25 moves rightward, the fixed-side die 22 and the movable-side die 24 come into contact with each other, forming a cavity (internal space) inside the die 21. Then, when pressure is further applied in a direction that moves the movable die plate 25 rightward, the fixed-side die 22 and the movable-side die 24 are clamped.

[0013] Furthermore, the mold clamping device 20 is equipped with an ejector device (not shown) that ejects a molded product from the opened movable mold 24. The ejector device mainly includes an ejector pin (not shown) provided in the movable mold 24 and an ejector motor 29 (see FIG. 2) that causes the ejector pin to extend and retract. The driving force of the ejector motor 29 is transmitted to the ejector pin, causing it to protrude toward the inner surface of the movable mold 24, thereby releasing the molded product from the mold.

[0014] The injection unit 30 plasticizes, measures, and injects the molding material. The injection unit 30 according to this embodiment is disposed horizontally apart from the mold clamping unit 20 (to the right of the mold clamping unit 20). The injection unit 30 mainly includes a heating cylinder 31, a screw 32, a hopper 33, and a hopper block 34.

[0015] The heating cylinder 31 is a cylindrical member extending in the left-right direction of the injection molding machine 10. The heating cylinder 31 mainly includes a resin passage 35 and a nozzle 36. A band heater (not shown) for heating the heating cylinder 31 is attached to the outer circumferential surface of the heating cylinder 31.

[0016] The resin passage 35 is a cylindrical space extending in the axial direction (longitudinal direction) inside the heating cylinder 31. The resin passage 35 communicates with the outside of the heating cylinder 31 (the cavity of the mold 21) through a nozzle 36 provided at the tip (front end) of the heating cylinder 31. In other words, the resin passage 35 is a space extending from the nozzle 36 along the axial direction.

[0017] The screw 32 is a cylindrical member. A spiral groove is formed on the outer circumferential surface of the screw 32. The screw 32 is housed in the internal space of the heating cylinder 31 in a state in which it can move left and right (hereinafter referred to as "forward and backward") and rotate in the injection molding machine 10. The screw 32 moves forward and backward when the driving force of the injection motor 37 is transmitted thereto, and rotates when the driving force of the metering motor 38 is transmitted thereto.

[0018] More specifically, when the injection motor 37 is rotated forward, the screw 32 moves (advances) toward the tip of the heating cylinder 31 (i.e., the nozzle 36). On the other hand, when the injection motor 37 is rotated backward, the screw 32 moves (retreats) toward the base end of the heating cylinder 31 (i.e., the side opposite the nozzle 36). Hereinafter, within the range that the tip position of the screw 32 can reach within the heating cylinder 31, the position closest to the nozzle 36 will be referred to as the "forward limit," and the position farthest from the nozzle 36 will be referred to as the "rear limit." Furthermore, the terms "forward rotation" and "reverse rotation" of the injection motor 37 do not specify an absolute direction of rotation, but merely specify a relative relationship (i.e., forward rotation and reverse rotation are rotations in opposite directions).

[0019] The hopper 33 is a funnel-shaped member that stores the raw molding material. The hopper block 34 is a member that supports the heating cylinder 31 and the hopper 33. The hopper 33 is connected to a resin passage 35 through the hopper block 34 at a portion of the heating cylinder 31 closer to the base end than the tip end. The molding material stored in the hopper 33 is supplied to the resin passage 35 of the heating cylinder 31 through an opening provided at the bottom end. The molding material used in this injection molding machine 10 is, for example, so-called "pellets" that are formed into a cylindrical shape.

[0020] The mold opening / closing motor 28, the ejector motor 29, the injection motor 37, and the metering motor 38 are servo motors (hereinafter sometimes referred to as "servo motors (28, 29, 37, 38)") that generate driving forces for opening and closing the mold 21, driving forces for extending and retracting the ejector pins, driving forces for advancing and retracting the screw 32, and driving forces for rotating the screw 32, for example, under the control of servo amplifiers (46 to 49) described below.

[0021] [Configuration of control device 40] 2, the control device 40 includes a central processing unit (CPU) 41, which is a computing means, and a memory 42. The memory 42 is configured, for example, as a read-only memory (ROM), a random access memory (RAM), a hard disk drive (HDD), or a combination of these. The control device 40 realizes the processing described below by having the CPU 41 read and execute program code stored in the memory 42. The memory 42 is also used as a work area when the CPU 41 executes the program.

[0022] However, the specific configuration of the control device 40 is not limited to this, and may be realized by hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array).

[0023] The injection molding machine 10 also includes a servo power supply unit 43 and a control power supply unit 44. The servo power supply unit 43 supplies high-current power obtained from an external power supply to the servo amplifiers (46-49). The servo amplifiers (46-49) supply the power obtained from the servo power supply unit 43 to the servo motors (28, 29, 37, 38). The control power supply unit 44 adjusts the power obtained from the external power supply to a small current and a constant voltage and supplies it to the control device 40. The control device 40 operates on the power obtained from the control power supply unit 44.

[0024] A display input device 45 is also connected to the control device 40. The display input device 45 is a user interface that includes a display (display device) that displays various information to be notified to the operator, and buttons, switches, dials, etc. (input devices) that accept input operations by the operator. The display input device 45 may also include a touch panel superimposed on the display. The display input device 45 accepts input operations by the operator and outputs an input signal corresponding to the accepted input operation to the control device 40.

[0025] The control device 40 controls the driving of the servo motors (28, 29, 37, 38) via servo amplifiers (46, 47, 48, 49). The servo amplifiers (46, 47, 48, 49) control (increase or decrease) the power supplied to the servo motors (28, 29, 37, 38) under the control of the control device 40. The servo motors mounted in the injection molding machine 10 include a mold opening / closing amplifier 46 that controls the mold opening / closing motor 28, an ejector amplifier 47 that controls the ejector motor 29, an injection amplifier 48 that controls the injection motor 37, and a metering amplifier 49 that controls the metering motor 38.

[0026] The control device 40, servo power supply unit 43, control power supply unit 44, mold opening / closing amplifier 46, ejector amplifier 47, injection amplifier 48, and metering amplifier 49 generate heat when they are driven. The mold opening / closing amplifier 46 and metering amplifier 49, which have a large load, generate a particularly large amount of heat. Therefore, a configuration for efficiently discharging (i.e., cooling) the heat generated by the components (40 to 49) housed in the internal space of the frame 50 to the outside of the frame 50 will be described below.

[0027] [Frame 50 Composition] Fig. 3 is a plan view of frame 50. Fig. 4 is a front view of frame 50. Fig. 5 is a rear view of frame 50. Fig. 6 is a right side view of frame 50. In Figs. 3 to 5, components (40 to 49, 57 to 58) are shown with solid lines to clearly show the positional relationship between first openings 53a, 53b, second openings 54a, 54b, and exhaust fans 59a, 59b, and the components (40 to 49, 57 to 59b) housed in the internal space of frame 50.

[0028] The injection molding machine 10 includes a frame 50. The frame 50 has a generally rectangular parallelepiped outer shape. As shown in FIG. 1, the frame 50 serves as a base supporting the mold clamping unit 20 and the injection unit 30 via an upper wall 52. As shown in FIGS. 3 to 6, the frame 50 has an internal space for accommodating the components (40 to 49, 57 to 58) of the injection molding machine 10. As shown in FIGS. 3 to 6, the internal space of the frame 50 is defined by a bottom wall 51, an upper wall 52, a front wall 53, a rear wall 54, a left side wall 55, and a right side wall 56. The front wall 53 is an example of a first side wall, and the rear wall 54 is an example of a second side wall. However, the first side wall and the second side wall are not limited to the aforementioned positional relationship as long as they are arranged opposite each other in the horizontal direction.

[0029] The bottom wall 51 and the top wall 52 are walls extending in a direction perpendicular to the up-down direction. The bottom wall 51 and the top wall 52 are arranged opposite each other in the up-down direction. The front wall 53 and the rear wall 54 are walls extending in a direction perpendicular to the front-to-rear direction. The front wall 53 and the rear wall 54 are arranged opposite each other in the front-to-rear direction. The left side wall 55 and the right side wall 56 are walls extending in a direction perpendicular to the left-to-right direction. The left side wall 55 and the right side wall 56 are arranged opposite each other in the left-to-right direction.

[0030] In this embodiment, the front-rear direction is an example of a first direction, and the left-right direction is an example of a second direction. Also, in this embodiment, the front-rear direction is the width direction of the frame 50, and the left-right direction is the length direction of the frame 50. Furthermore, in this embodiment, of the front wall 53 and the rear wall 54, the side on which the display input device 45 is installed (the operation side) is the front wall 53, and the opposite side (the anti-operation side) is the rear wall 54. However, the first direction and the second direction are relative to each other, and they only need to be perpendicular to the up-down direction and perpendicular to each other.

[0031] A first support wall 57 and a second support wall 58 are disposed in the internal space of the frame 50. The first support wall 57 and the second support wall 58 extend in a direction perpendicular to the front-rear direction. More specifically, the first support wall 57 and the second support wall 58 protrude upward from the bottom wall 51 and extend in the left-right direction. A predetermined gap is formed between the upper ends of the first support wall 57 and the second support wall 58 and the top wall 52. The first support wall 57 and the second support wall 58 are disposed opposite each other with a predetermined distance between them in the front-rear direction. More specifically, the second support wall 58 is disposed closer to the rear wall 54 than the first support wall 57. The first support wall 57 and the second support wall 58 are connected at both left-right ends, and as a whole, they have a box-like outer shape with an open top.

[0032] The first support wall 57 supports the control device 40 and the control power supply unit 44 on its front surface (the surface facing the front wall 53). The control device 40 and the control power supply unit 44 are supported by the first support wall 57 at approximately the center of the first support wall 57 in the left-right direction. The control power supply unit 44 is also supported by the first support wall 57 below the control device 40.

[0033] The second support wall 58 supports, on its back surface (the surface facing the rear side wall 54), the servo power supply unit 43, the mold opening and closing amplifier 46, the ejector amplifier 47, the injection amplifier 48, and the metering amplifier 49. The servo power supply unit 43, the mold opening and closing amplifier 46, the ejector amplifier 47, the injection amplifier 48, and the metering amplifier 49 are supported by the second support wall 58 at predetermined intervals in the left-right direction.

[0034] In this embodiment, the ejector amplifier 47, mold opening and closing amplifier 46, servo power supply unit 43, injection amplifier 48, and metering amplifier 49 are arranged in this order from the left end to the right. More specifically, the mold opening and closing amplifier 46 and the metering amplifier 49, which generate particularly large amounts of heat, are not arranged adjacent to each other, but are supported by the second support wall 58 on the opposite side of the servo power supply unit 43 and the injection amplifier 48. However, the arrangement of the servo power supply unit 43, mold opening and closing amplifier 46, ejector amplifier 47, injection amplifier 48, and metering amplifier 49 is not limited to the example described above.

[0035] Heat sinks 43a, 46a, 47a, 48a, and 49a that dissipate generated heat are attached to the servo power supply unit 43, the mold opening / closing amplifier 46, the ejector amplifier 47, the injection amplifier 48, and the metering amplifier 49. The heat sinks 43a, 46a, 47a, 48a, and 49a protrude to the front side (the side facing the first support wall 57) through through holes (not shown) that penetrate the second support wall 58 in the thickness direction. In other words, the heat sinks 43a, 46a, 47a, 48a, and 49a are disposed between the first support wall 57 and the second support wall 58.

[0036] Furthermore, ventilation fans 43b, 46b, 47b, 48b, and 49b are provided below the heat sinks 43a, 46a, 47a, 48a, and 49a. More specifically, the ventilation fans 43b, 46b, 47b, 48b, and 49b are disposed between the first support wall 57 and the second support wall 58. More specifically, the ventilation fans 43b, 46b, 47b, 48b, and 49b are supported on the front surface of the second support wall 58.

[0037] The blower fans 43b, 46b, 47b, 48b, and 49b blow air upward toward the heat sinks 43a, 46a, 47a, 48a, and 49a. That is, as shown by the arrows in FIG. 6, the air blown by the blower fans 43b, 46b, 47b, 48b, and 49b exchanges heat with the heat sinks 43a, 46a, 47a, 48a, and 49a, and then passes above the first support wall 57 and the second support wall 58.

[0038] The front wall 53 is formed with first openings 53a and 53b penetrating in the thickness direction. The first openings 53a and 53b are formed spaced apart in the left-right direction. The first openings 53a and 53b are formed on opposite sides in the left-right direction, sandwiching the control device 40 and the control power supply unit 44. In other words, the control device 40 and the control power supply unit 44 are disposed between the first openings 53a and 53b. Furthermore, the lower ends of the first openings 53a and 53b are located below the control device 40 and the control power supply unit 44.

[0039] Note that louvers may be attached to the first openings 53a and 53b. The louvers serve to prevent dust from entering the internal space of the frame 50 through the first openings 53a and 53b, and also to guide air entering the internal space of the frame 50 through the first openings 53a and 53b obliquely upward.

[0040] The rear wall 54 is formed with second openings 54a and 54b penetrating the wall in the thickness direction. The second openings 54a and 54b are spaced apart in the left-right direction. More specifically, the second openings 54a and 54b are formed at positions facing the mold opening / closing amplifier 46 and the metering amplifier 49, respectively, when viewed from the front-rear direction. The second openings 54a and 54b are also offset from the first openings 53a and 53b in the left-right direction. More specifically, the second openings 54a and 54b are positioned on opposite sides of the first openings 53a and 53b in the left-right direction. Furthermore, the second openings 54a and 54b are positioned above the first openings 53a and 53b. More specifically, the upper ends of the second openings 54a and 54b are positioned above the first support wall 57 and the second support wall 58.

[0041] In this embodiment, an example in which the first openings 53a, 53b and the second openings 54a, 54b are formed in two locations will be described, but the number of first openings and second openings is not limited to the above example and may be one, or three or more. For example, the second openings may be provided in five locations that overlap with the servo power supply unit 43, the mold opening / closing amplifier 46, the ejector amplifier 47, the injection amplifier 48, and the metering amplifier 49, respectively, when viewed from the front-to-rear direction. Furthermore, the number of first openings and second openings may be the same or different.

[0042] Furthermore, exhaust fans 59a and 59b are attached to the second openings 54a and 54b. The exhaust fans 59a and 59b rotate in a direction to exhaust air from the interior space of the frame 50 to the outside of the frame 50. The first openings 53a and 53b function as air intake ports that supply air from outside the frame 50 to the interior space of the frame 50, which becomes negative pressure when air is exhausted by the exhaust fans 59a and 59b.

[0043] More specifically, as shown by the arrows in Fig. 6, the air supplied through the first openings 53a and 53b hits the front surface of the first support wall 57 and is guided upward. In this process, the control device 40 and the control power supply unit 44 are cooled. Furthermore, as shown by the arrows in Figs. 3 and 6, the air that reaches above the first support wall 57 passes through gaps between the upper wall 52 and the first support wall 57 and between the upper wall 52 and the second support wall 58 toward the second openings 54a and 54b. In this process, the air from the blower fans 43b, 46b, 47b, 48b, and 49b that has exchanged heat with the heat sinks 43a, 46a, 47a, 48a, and 49a is guided to the second openings 54a and 54b. The air supplied through the first openings 53a and 53b and the wind from the blower fans 43b, 46b, 47b, 48b, and 49b are then exhausted to the outside of the frame 50 by the exhaust fans 59a and 59b.

[0044] FIG. 7 is a table comparing the temperature of the servo amplifier when the combination and number of simple openings (openings without fans) provided in the front wall 53 and rear wall 54, exhaust fans, and intake fans are changed. When both the front wall 53 and rear wall 54 are completely closed as in condition 1, the temperature of the servo amplifier after a predetermined time has elapsed was 27.5°C. In contrast, the temperature changes were compared when the combination and number of simple openings, exhaust fans, and intake fans are changed as in conditions 2 to 6. Note that the conditions for measuring the temperature of the servo amplifier are the same under conditions 1 to 6.

[0045] Comparing conditions 2 and 3 (front wall 53 was closed and two of the simple opening, exhaust fan, and intake fan were provided on rear wall 54) with condition 4 (front wall 53 was closed and an exhaust fan was provided on rear wall 54), the temperature of the servo amplifier was lower under condition 4. This is thought to be because, under conditions 2 and 3, the air introduced into the internal space of frame 50 by the simple opening or intake fan was discharged from the exhaust fan without reaching the servo amplifier.

[0046] On the other hand, when a simple opening or an air supply fan was provided on the front wall 53 and an exhaust fan was provided on the rear wall 54, as in conditions 5 and 6, the temperature of the servo amplifier was lower than under other conditions 1 to 4. This is thought to be because the air introduced into the internal space of the frame 50 through the simple opening or the air supply fan cooled the servo amplifier and was then discharged from the exhaust fan.

[0047] Furthermore, when comparing condition 5 (a simple opening is provided in front wall 53) with condition 6 (an intake fan is provided in front wall 53), the temperature of the servo amplifier is lower under condition 5. In other words, it was confirmed that the effect of the intake fan is limited, and condition 5 is the best in both cooling efficiency and cost performance. However, in the above embodiment, intake fans that supply air from outside frame 50 to the inside may be attached to first openings 53a, 53b.

[0048] [Effects of the embodiment] According to the above embodiment, air flowing in through the first openings 53a, 53b in the front wall 53 cools the servo amplifiers (46-49) and is then exhausted through the exhaust fans 59a, 59b attached to the second openings 54a, 54b in the rear wall 54. By providing the second openings 54a, 54b (exhaust fans 59a, 59b) at positions that overlap with the servo amplifiers (46, 49) when viewed from the front-to-rear direction, air convection around the servo amplifiers (46, 49) is promoted. This allows the servo amplifiers (46, 49) to be efficiently cooled.

[0049] Furthermore, according to the above embodiment, by providing the second openings 54a, 54b (exhaust fans 59a, 59b) above the first openings 53a, 53b, cool air flows in through the first openings 53a, 53b, and the air that is warmed by heat exchange with the heated components (40-49) and moves upward is discharged through the second openings 54a, 54b. This allows the internal space of the frame 50 to be cooled more efficiently. Furthermore, by locating the lower ends of the first openings 53a, 53b below the control power supply unit 44 and locating the upper ends of the second openings 54a, 54b above the first support wall 57 and the second support wall 58, the above-mentioned effects become even more pronounced.

[0050] Furthermore, according to the above embodiment, by forming the first openings 53a, 53b and the second openings 54a, 54b so as to be offset from one another in the left-right direction, it is possible to ensure that the air in the internal space of the frame 50 is circulated evenly. This allows the internal space of the frame 50 to be cooled even more efficiently.

[0051] Furthermore, according to the above embodiment, the air that has flowed into the internal space of the frame 50 through the first openings 53a, 53b is joined with the air from the blower fans 43b, 46b, 47b, 48b, 49b that has exchanged heat with the heat sinks 43a, 46a, 47a, 48a, 49a, thereby promoting air convection in the internal space of the frame 50. This enables the internal space of the frame 50 to be cooled more efficiently.

[0052] Furthermore, according to the above embodiment, the second openings 54a, 54b (exhaust fans 59a, 59b) are arranged to face the mold opening / closing amplifier 46 and the metering amplifier 49, which generate a particularly large amount of heat, thereby making it possible to cool the internal space of the frame 50 even more efficiently.

[0053] The above-described embodiments are merely illustrative examples of the present invention, and are not intended to limit the scope of the present invention to these embodiments. Those skilled in the art can implement the present invention in various other forms without departing from the spirit of the present invention. [Explanation of symbols]

[0054] 10... injection molding machine, 20... mold clamping device, 21... mold, 22... fixed side mold, 23... fixed die plate, 24... movable side mold, 25... movable die plate, 26... toggle link mechanism, 27... tie bar, 28... mold opening / closing motor, 29... ejector motor, 30... injection device, 31... heating cylinder, 32... screw, 33... hopper, 34... hopper block, 35... resin passage, 36... nozzle, 37... injection motor, 38... metering motor, 40... control device, 41... CPU, 42... memory, 43... servo power supply unit, 43a, 46a, 47a, 48a, 49a...heat sink, 43b, 46b, 47b, 48b, 49b...blower fan, 44...control power supply unit, 45...display input device, 46...mold opening / closing amplifier, 47...ejector amplifier, 48...injection amplifier, 49...metering amplifier, 50...frame, 51...bottom wall, 52...upper wall, 53...front wall, 53a, 53b...first opening, 54...rear wall, 54a, 54b...second opening, 55...left side wall, 56...right side wall, 57...first support wall, 58...second support wall, 59a, 59b...exhaust fan

Claims

1. A molding machine comprising a mold clamping device that opens, closes, and clamps a mold, and an injection device that injects a molding material into a cavity of the clamped mold, a servo motor for operating the molding machine; a servo amplifier for controlling the supply of power to the servo motor; a frame having an upper wall for supporting the mold clamping unit and the injection unit, and an internal space for accommodating the servo amplifier, the frame includes a first side wall and a second side wall that are disposed opposite to each other with the servo amplifier interposed therebetween in a first direction that is orthogonal to the up-down direction, a first opening is formed in the first sidewall; A molding machine characterized in that a second opening is formed in the second side wall at a position overlapping with the servo amplifier when viewed from the first direction, and an exhaust fan that exhausts air from the internal space is attached to the second opening.

2. The molding machine according to claim 1, The molding machine, wherein the second opening is formed above the first opening.

3. The molding machine according to claim 1, The molding machine, characterized in that the first opening and the second opening are formed to be offset from each other in the vertical direction and in a second direction perpendicular to the first direction.

4. The molding machine according to claim 1, The internal space of the frame includes: a first support wall perpendicular to the first direction and having a gap formed between the first support wall and the upper wall; a second support wall that is perpendicular to the first direction and has a gap formed between it and the top wall, and is provided at a position closer to the second side wall than the first support wall; The second support wall is the servo amplifier is supported on a surface facing the second side wall; a heat sink for dissipating heat from the servo amplifier protrudes from the side facing the first support wall; The molding machine further comprises a blower fan disposed below the heat sink between the first support wall and the second support wall, the blower fan blowing air upward toward the heat sink.

5. The molding machine according to claim 4, A molding machine, characterized in that an upper end of the second opening is located above the first support wall and the second support wall.

6. The molding machine according to claim 4, The servo motor is a mold opening / closing motor for opening, closing, and clamping the mold; a metering motor that meters the molding material to be injected into the mold; an injection motor that injects the measured molding material into the mold; the servo amplifier of the mold opening / closing motor and the servo amplifier of the metering motor are supported by the second support wall on opposite sides of the servo amplifier of the injection motor in a second direction perpendicular to the up-down direction and the first direction, the first openings are provided at two locations spaced apart in the second direction, A molding machine characterized in that the second openings are provided in two locations that overlap with the servo amplifier of the mold opening / closing motor and the servo amplifier of the metering motor, respectively, when viewed from the first direction.

7. 7. The molding machine according to claim 6, A molding machine characterized in that the two second openings are located on opposite sides of the two first openings in the second direction.

8. 7. The molding machine according to claim 6, A molding machine characterized in that the first support wall supports a control device that controls the servo motor through the servo amplifier on the surface facing the first side wall and between the two first openings.

9. 9. The molding machine according to claim 8, A molding machine characterized in that the first support wall supports a control power supply unit that supplies a constant voltage to the control device on the surface facing the first side wall, below the control device, and between the two first openings.

10. The molding machine according to claim 9, A molding machine, characterized in that a lower end of the first opening is located below the control power supply unit.

11. The molding machine according to claim 1, A molding machine characterized in that an air supply fan is attached to the first opening to supply air from outside the frame to the internal space.

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