Injection molding machine base

Abstract

A base (2) is used in an injection molding machine (1) having a mold clamping device (31) with a pressure plate (32), and at least carries the mold clamping device (31) and supports the mold clamping device (31), the base (2) comprising: a pair of main beams (3a, 3b) spaced apart from each other in the width direction of the base (2) and extending side by side along the length direction of the base (2); and a pressure plate mounting plate (4) arranged on the main beams (3a, 3b) and mounted with the pressure plate (32), the outer edge portions (Ed1, Ed2) of the pressure plate mounting plate (4) in the length direction including welding portions joined to the main beams (3a, 3b) by welding, and the pressure plate mounting plate (4) having a shape in which the length in the length direction at the outer end (Ee) is longer than the inner portion (Pi) in the width direction.

Description

Technical Field

[0001] The present invention relates to a base used in an injection molding machine having a mold clamping device with a pressure plate. Background Art

[0002] This base constituting the stand of the injection molding machine has a mold clamping device, an injection device, etc. placed thereon. When the injection molding machine is used, various external forces are applied due to the weight and movement of the mold clamping device, etc.

[0003] In connection with this, in Patent Document 1, for the purpose of "suppressing the inclination of a fixed platen in a clamping mechanism of an injection molding machine", "a clamping mechanism of an injection molding machine is proposed, wherein a fixed platen is provided on a base of the injection molding machine, and the clamping mechanism of the injection molding machine is characterized in that a reinforcing rib is provided on a lower portion of a nozzle contact side surface of the fixed platen, and a support provided on the base is connected to the reinforcing rib to support the fixed platen".

[0004] Among them, regarding the "base", more specifically, as described in Patent Document 1 Figure 2 and Figure 3 As shown in the foregoing, there are the following descriptions: "The base 3 includes upper main pipes 31a and 31b arranged parallel to the mold clamping axis, similarly to the lower main pipes 32a and 32b arranged parallel to the mold clamping axis, and includes pillars 34a and 34b connecting the upper and lower main pipes at positions approximately below the two ends of the fixed platen 4. In addition, a pillar 30 for supporting the reinforcing rib 10 is provided below the support leg of the reinforcing rib 10."; "The connection between the fixed platen 4 and the upper main pipes 31a and 31b can be performed by clamping the connecting plate 11, which can improve the flatness of the connecting surface or the connection strength, or improve the operability of the connecting operation."; and "The fixed platen 4 includes a reinforcing rib 10 on the nozzle contact side and a pillar 30 below the reinforcing rib 10. The reinforcing rib 10 and the pillar 30 are connected directly or via the plate 11." etc.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2000-289069 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] For example, in the "base 3" described in Patent Document 1, if external forces such as those caused by deformation of the "fixed platen 4" in the tilting direction repeatedly act on the "plate 11", durability may be reduced.

[0010] In contrast, in order to resist the external force, the surface area of ​​the "plate 11" can be increased. However, due to limitations such as the required space in the "base 3", the size of the "plate 11" cannot be simply increased.

[0011] Furthermore, for example, in the above-described "base 3", if external force such as when the "fixed platen 4" is deformed in the tilting direction repeatedly acts on the "upper main pipes 31a, 31b" via the "plate 11", the durability of the "base 3" is reduced.

[0012] The present invention aims to solve such a problem, and an object thereof is to provide a base for an injection molding machine that can improve durability.

[0013] Means for solving problems

[0014] A base capable of solving the above-mentioned problems is used in an injection molding machine equipped with a clamping device having a pressure plate, and at least carries and supports the clamping device, the base comprising: a pair of main beams spaced apart from each other in the width direction of the base and extending side by side along the length direction of the base; and a pressure plate mounting plate arranged on the main beams and equipped with the pressure plate, the outer edge portion of the pressure plate mounting plate in the length direction including a welding portion joined to the main beam by welding, the pressure plate mounting plate having a shape in which the length in the length direction at the outer end is longer than the inner portion in the width direction.

[0015] Another base capable of solving the above-mentioned problems is used in an injection molding machine having a mold clamping device with a pressure plate, and at least carries and supports the mold clamping device. The base comprises: a pair of main beams that are spaced apart from each other in the width direction of the base and extend side by side along the length direction of the base; a pressure plate mounting plate that is connected to the main beams by welding and is equipped with the pressure plate; and a connecting beam that extends between the pair of main beams in the width direction on the frame setting surface side of the pressure plate mounting plate and connects the main beams to each other.

[0016] Effects of the Invention

[0017] According to the above-described base, durability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view showing an example of an injection molding machine including a base according to an embodiment of the present invention.

[0019] Figure 2 It is from Figure 1 A partially enlarged stereoscopic view of the injection molding machine with the base removed.

[0020] Figure 3It is shown together with the fixed platen of the mold clamping device. Figure 2 A partially enlarged stereoscopic view of the base.

[0021] Figure 4 It is cut off Figure 2 A three-dimensional diagram showing a portion of the base and the main parts removed, viewed from different directions.

[0022] Figure 5 yes Figure 4 The main parts of the base are shown in front view, rear view and top view.

[0023] Figure 6 It is a plan view showing a modified example of the side plate member of the pressure plate mounting plate included in the chassis.

[0024] Figure 7 It is a plan view of the main part of the base, showing a modified example of the pressure plate mounting plate included in the base.

[0025] Figure 8 Indicates when the pressure plate mounting plate is removed. Figure 4 A perspective view of the main parts of the base.

[0026] Figure 9 It is cut off Figure 2 A three-dimensional diagram showing a portion of the base and the main parts removed, viewed from different directions.

[0027] Figure 10 yes Figure 9 The main parts of the base are shown in front view, rear view and top view.

[0028] Figure 11 Indicates when the pressure plate mounting plate is removed. Figure 9 A perspective view of the main parts of the base.

[0029] Figure 12 This is a rear view of the main part of the base, showing a modified example or another arrangement example of the connecting beams included in the base.

[0030] Figure 13 It is a plan view of the main part of the base, showing a modified example of the pressure plate mounting plate included in the base.

[0031] Figure 14 yes Figure 9 A partial enlarged view of the rear view of the main part of the base is shown. DETAILED DESCRIPTION

[0032] The embodiments of the present invention will be described in detail with reference to the following drawings.

[0033] like Figure 1As illustrated, the base 2 according to the embodiment of the present invention is installed on the frame installation surface Si, and various devices of the injection molding machine 1 are placed thereon to be used as a stand for supporting the devices.

[0034] The injection molding machine 1 will be described in detail later. It generally comprises an injection unit 21, which melts the molding material and injects it into a mold assembly 101 through the rotation and advancement of an internally disposed screw 23 and the heating of a surrounding heater 24; a moving unit 26, which moves the injection unit 21 forward and backward relative to the mold assembly 101; a clamping unit 31, which opens and closes the mold assembly 101 between a closed and open state; and an ejector unit 41, which removes the molded product from the mold assembly 101 in the open state. In the illustrated example, the mold assembly 101 includes a fixed mold 102, which defines a cavity within the mold assembly in the closed state, a movable mold 103, and movable components 104, such as ejector pins, which are displaced by the ejector unit 41 to eject and remove the molded product. The mold assembly 101 is appropriately mounted on the injection molding machine 1 and is replaceable, depending on the shape of the molded product to be produced. It is not considered part of the injection molding machine 1.

[0035] The mold clamping unit 31 primarily comprises a pressure plate 32 configured to clamp the mold assembly 101 from both sides, and a pressure plate operating mechanism 33 that enables the movement of the pressure plate 32. The pressure plate 32 includes a fixed pressure plate 32a, located between the injection unit 21 and the mold assembly 101 and fixed at its lower end to the base 2; and a movable pressure plate 32b, located between the fixed pressure plate 32a and across the mold assembly 101, capable of moving toward and away from the fixed pressure plate 32a. Within the mold assembly 101 located between the fixed pressure plate 32a and the movable pressure plate 32b, the fixed mold 102 is mounted on the fixed pressure plate 32a side, and the movable mold 103 is mounted on the movable pressure plate 32b side. Furthermore, the mold clamping unit 31 includes one or more connecting rods 32c extending from the fixed pressure plate 32a toward the rear pressure plate 34, described later, and connecting the fixed pressure plate 32a and the rear pressure plate 34. In this example, the movable platen 32b is guided by the connecting rod 32c in its separation and approach displacement relative to the fixed platen 32a, but may not be guided by the connecting rod 32c.

[0036] In addition, at the position where the movable platen 32b is separated from the fixed platen 32a, the movable mold 103 of the mold device 101 is in an open mold state, which is opened from the fixed mold 102. By moving the movable platen 32b closer to the fixed platen 32a from the separated position, the movable mold 103 is in a closed mold state, which is closed relative to the fixed mold 102. In addition, if the movable platen 32b is brought closer to the fixed platen 32a, the movable mold 103 is in a clamped mold state, which is pressed against the fixed mold 102. Here, the direction of the fixed platen 32a close to the fixed mold 102 on which the mold device 101 is installed is set as the front side, and the direction away from the fixed platen 32a is set as the rear side. With regard to many parts of the clamping device 31 other than the fixed platen 32a, Figure 1 In the figure, the right direction closer to the fixed platen 32a is the front side, and the left direction farther from the fixed platen 32a is the rear side.

[0037] For example, since the fixed platen 32a, fixedly mounted on the base 2 at its lower end, holds the fixed mold 102 of the mold assembly 101, a load is applied due to the weight of the fixed mold 102. Furthermore, the fixed platen 32a has connecting rods 32c mounted at its four corners. Therefore, when the mold assembly 101 is clamped between the fixed platen 32a and the movable platen 32b in the platen operating mechanism 33, deformation may occur due to the tensile force acting on the connecting rods 32c. Consequently, various external forces act on the base 2 to which the fixed platen 32a is mounted. Furthermore, the base 2 also has the rear platen 34 mounted thereon, and loads due to the weight of the rear platen 34 also act. The main purpose of the embodiment described here is to improve the durability of the base 2, which is subject to such external forces.

[0038] (One base)

[0039] The base 2 of the illustrated embodiment is Figure 2 The partially enlarged view in FIG. 2 shows a structure composed of a plurality of beams or components including beams and pillars. The base 2 shown in the figure includes a mold clamping device side frame 2a on which the mold clamping device 31 is mounted. Figure 3 As shown, a fixed platen 32a is mounted on the mold clamping unit side frame 2a. Furthermore, the base 2 also includes an injection unit side frame 2b connected to the end of the mold clamping unit side frame 2a and mounting the injection unit 21. The details of the injection unit side frame 2b will be described later. Although not shown, there are also bases in which the mold clamping unit side frame and the injection unit side frame are integrated. Such bases mount not only the mold clamping unit but also the injection unit, etc.

[0040] The mold clamping device side frame 2a mainly comprises: a pair of main beams 3a and 3b, which are spaced apart from each other in the width direction of the base 2 (in the horizontal plane, in a direction perpendicular to the direction in which the fixed pressure plate 32a and the movable pressure plate 32b of the mold clamping device 31 separate and approach each other) and extend side by side along the length direction of the base 2 (in the direction in which the fixed pressure plate 32a and the movable pressure plate 32b of the mold clamping device 31 separate and approach each other); and a pressure plate mounting plate 4, which is arranged on the main beams 3a and 3b near the end portion on the injection device side frame 2b side. In this embodiment, the pressure plate mounting plate 4 is composed of two side plate components 5a and 5b that are divided in the width direction of the base 2 and arranged on each main beam 3a and 3b. In addition, between the two side plate components 5a and 5b in the width direction, as shown in FIG. Figure 2 As shown, for example, a center plate member 5c thinner than the side plate members 5a and 5b is provided, and the outer end in the width direction of the center plate member 5c is welded to the inner ends Ei in the width direction of the side plate members 5a and 5b.

[0041] like Figure 3 As shown, the fixed pressure plate 32a is mounted on the pressure plate mounting plate 4. More specifically, in the illustrated example, the fixed pressure plate 32a has a substantially rectangular plate shape, such as a square, with rounded corners when viewed from the front. A pair of block-shaped legs 32e, such as a pair of legs 32e, are provided on the bottom surface of its lower end. These legs 32e protrude from the bottom surface at intervals in the width direction of the base 2 and have a step on the outer side in the width direction. Formed at each corner of the plate-shaped fixed pressure plate 32a are through-holes 32f through which connecting rods 32c pass, and recesses 32g, which recess the surface portion surrounding the through-holes 32f relative to the rest of the surface. On the other hand, each side plate member 5a of the pressure plate mounting plate 4 has a pressure plate fixing portion provided at a position corresponding to the location of each leg 32e. The fixing portion is secured to each leg 32e. The fixing portion of the pressure plate is omitted as an example, but can be set as a hole portion for inserting bolts for fastening to each leg portion 32e of the fixed pressure plate 32a. However, the mounting method of the fixed pressure plate 32a is not limited to this. In addition, the movable pressure plate 32b is Figure 3 Although not shown, the fixed platen 32a is spaced apart from the fixed platen 32a on the side opposite to the injection device side frame 2b in the longitudinal direction of the base 2, and the spacing changes according to the operation of the platen operating mechanism 33.

[0042] The pressing plate mounting plate 4 is welded and joined to the main beams 3a and 3b at the welding portion. The welding portion between the pressing plate mounting plate 4 and the main beams 3a and 3b includes the following: Figure 2 、 Figure 4 and Figure 5The illustrated platen mounting plate 4 includes at least one of the outer edges Ed1 and Ed2 in the longitudinal direction of the base 2. The welded portions of the outer edges Ed1 and / or Ed2 can be modified as appropriate. However, in this example, a portion of the inner width of the outer edge Ed1 on the movable platen 32b side of the platen mounting plate 4 is welded to the main beams 3a and 3b. The entire portion of the outer edge Ed2 on the injection unit 21 side of the platen mounting plate 4 that contacts the main beams 3a and 3b is welded. Furthermore, in this embodiment, the side plate members 5a and 5b of the platen mounting plate 4 are welded to the main beams 3a and 3b not only at the outer edges Ed1 and Ed2 but also at the outer end Ee located on the outer side of the base 2 in the width direction. Therefore, this outer end Ee also serves as a welded portion. As long as at least a portion of the outer edges Ed1, Ed2, or the outer end Ee of the platen mounting plate 4 is welded to the main beams 3a and 3b, it can be considered a welded portion.

[0043] When the platen mounting plate has such a welded portion on its outer edge, various external forces acting on the fixed platen can cause weld cracks in these welded portions. More specifically, in a fixed platen whose lower end is fixed to a base and has connecting rods attached to its four corners, when the mold assembly is in a closed state, with the lower end and four corners constrained, the pressed center portion of the mold assembly can deform, bulging toward the injection molding machine while tilting toward the movable platen. In this case, external forces acting on the platen mounting plate, where the lower end of the fixed platen is attached, can cause weld cracks in the outer edge of the platen mounting plate due to this deformation of the fixed platen, particularly in the direction of separating the longitudinal outer edge from the main beam. This becomes more pronounced in high-cycle molding, where molded products are repeatedly produced in relatively short cycles.

[0044] In order to prevent such welding cracks and alleviate the stress on the welding parts caused by the external force as described above, it is possible to consider lengthening the pressure plate mounting plate in the length direction so that the outer edge is away from the position where the pressure plate is installed and fixed, and to increase the surface area and other dimensions of the pressure plate mounting plate so that it can fully resist the external force.

[0045] However, simply increasing the size of the platen mounting plate is not feasible because, for example, a space below the fixed platen and the movable platen is required when removing a molded product molded in the mold device.

[0046] In contrast, in this embodiment, the pressure plate mounting plate 4 has a shape that is longer in the longitudinal direction at the outer end Ee than in the inner portion Pi in the width direction of the base 2. This allows the welded portions of the outer edges Ed1 and Ed2 of the pressure plate mounting plate 4, at least near the outer end Ee, to be sufficiently distant from the pressure plate fixing portion, effectively suppressing weld cracks in these welded portions. Furthermore, the inner portion Pi in the width direction of the pressure plate mounting plate 4 is relatively short in the longitudinal direction, making it easier to secure the required space near the outer edges Ed1 and / or Ed2 in this inner portion Pi. In this example, the pressure plate mounting plate 4 is constructed from side plate members 5a and 5b, and the longitudinal length of the inner portion Pi of the pressure plate mounting plate 4 can be set to the longitudinal length at the inner end Ei of the side plate members 5a and 5b in the width direction. Furthermore, the longitudinal length of the outer end Ee or inner portion Pi of the pressure plate mounting plate 4 can be set to the length measured along the longitudinal direction of the base 2.

[0047] More preferably, at least one of the outer edge portions Ed1 and Ed2 of the pressure plate mounting plate 4 has a protruding edge portion 6, which protrudes outward in the longitudinal direction relative to the inner portion Pi, in the outer portion including the outer end Ee in the width direction. By forming the protruding edge portion 6 on the outer portion in the width direction of the pressure plate mounting plate 4, while ensuring the required space on the inner side in the width direction, the welded portion to the main beams 3a and 3b provided on the protruding edge portion 6 is more reliably separated from the pressure plate fixing portion.

[0048] In this embodiment, of the outer edges Ed1 and Ed2 of the platen mounting plate 4, a protruding edge 6 is formed only on the outer edge Ed1 on the movable platen 32b side. Consequently, a recessed space 7, for example, in a rectangular shape when viewed from above, is formed in the inner portion Pi of the platen mounting plate 4, adjacent to the outer edge Ed1 on the movable platen 32b side, longitudinally inward of the protruding edge 6. This recessed space 7 forms part of the molded product removal space Se provided below the fixed platen 32a and movable platen 32b. This prevents the platen mounting plate 4 from interfering with the removal of the molded product after it has been molded in the mold assembly 101 and then dropped downward from the mold assembly 101 in its open state. The side surface of the outer edge Ed1 of the platen mounting plate 4 facing the recessed space 7 is L-shaped when viewed from above.

[0049] In addition, if Figure 6 As in the modified example shown in (a) of FIG. 5 , the protruding edge portion 6 may be formed on both the outer edge portions Ed1 and Ed2 of the side plate member 5a. Figure 6In (a), in each outer edge portion Ed1 and Ed2, a protruding edge portion 6 protruding outward in the longitudinal direction is formed on the outer portion in the width direction of the pressure plate mounting plate 4. In this case, it is also preferred to provide a vacancy 7 in the shape of a rectangle or the like, which is further inward in the longitudinal direction than the protruding edge portion 6, on the inner portion Pi. Figure 6 In the example shown in (a), as is clear from the figure, the length in the longitudinal direction is longer at the outer end Ee in the width direction than at the inner portion Pi (inner end Ei) in the width direction of the pressure plate mounting plate 4.

[0050] In the above description, the protruding edge 6 has parallel side surfaces in the width direction when viewed from above, and the length of the protruding edge 6 in the longitudinal direction is constant over the entire width direction. However, the length of the protruding edge 6 in the longitudinal direction may be changed smoothly or in steps in the width direction. For example, Figure 6 In the modified example shown in (b), a protruding edge portion 6 is formed on each of the outer edge portions Ed1 and Ed2 of the side plate member 5a, and the length of each protruding edge portion 6 gradually decreases as it approaches the inner side in the width direction. The side plate member 5a has a trapezoidal shape when viewed from above, as the length of the longitudinal direction gradually decreases from the outer end Ee to the inner end Ei, and the protruding edges 6 are formed on the outer edge portions Ed1 and Ed2.

[0051] exist Figure 6 Only one side plate member 5a of the pressure plate mounting plate 4 is shown in (a) and (b), but the other side plate member 5b can also be made into the same shape as the one side plate member 5a.

[0052] The widthwise length of the protruding edge 6 can be appropriately determined in consideration of other conditions, such as the required size of the vacant space 7 that forms part of the molded product removal space Se. Although it depends on various conditions, from the perspective of ensuring the required molded product removal space Se, it is sometimes preferable that the widthwise length of the protruding edge 6 be equal to or shorter than the width of the main beam 3a, as in the present embodiment.

[0053] To prevent weld cracking during welding between the inner ends Ei of the side panel members 5a and 5b and the widthwise outer ends of the center panel member 5c, the inner ends Ei of the side panel members 5a and 5b are preferably positioned inward in the width direction, somewhat away from the clamping plate fixing area. In this example, the inner ends Ei of the side panel members 5a and 5b protrude further inward in the width direction than the widthwise inner side surfaces 3c of the main beams 3a and 3b to which they are mounted. Furthermore, in this example, the outer ends Ee of the side panel members 5a and 5b are substantially aligned with the widthwise outer side surfaces 3f of the main beams 3a and 3b when viewed from above, and are substantially flush with the outer side surfaces 3f. Both the inner ends Ei and the outer ends Ee of the side panel members 5a and 5b can extend linearly in the longitudinal direction, as in the illustrated embodiment.

[0054] exist Figure 7 In the modified example shown, the pressure plate mounting plate 4 is not composed of the two divided side plate parts 5a, 5b, but is composed of an integrated mounting plate part 5f spanning between a pair of main beams 3a, 3b. Except for this, it has almost the same structure as the above example. Figure 7 In the plan view, the bridge plate member 5f extends over the entire width direction between the outer side surfaces 3f of the main beams 3a and 3b.

[0055] Including Figure 7 The pressure plate mounting plate 4 of the mounting plate member 5f shown in the figure also has a shape in which the length in the longitudinal direction is longer at the outer end Ee than at the inner portion Pi in the width direction, thereby effectively suppressing welding cracks at the welded portion of the outer edge portions Ed1 and Ed2 and ensuring a space Se for removing the molded product. Figure 7 In the illustrated variation, at least one of the outer edges Ed1 and Ed2 of the platen mounting plate 4, for example, the outer edge Ed1 on the movable platen 32b side, preferably also includes a protruding edge 6, extending outward in the longitudinal direction relative to the inner portion Pi, in the outer portion including the widthwise outer end Ee. Consequently, a vacant space 7 is formed in the inner portion Pi adjacent to the outer edge Ed1 on the movable platen 32b side, which can constitute a portion of the molded product removal space Se. The longitudinal length of the inner portion Pi can be measured at the widthwise inner portion where the protruding edge 6 is absent.

[0056] The illustrated mold clamping unit side frame 2a further includes a pair of frame bases 8a and 8b spaced apart from the main beams 3a and 3b and extending in the longitudinal direction, on the frame installation surface Si side (vertically downward) of the pair of main beams 3a and 3b, and a plurality of struts 9 interposed between the main beams 3a and 3b and the frame bases 8a and 8b and extending in the height direction (vertically). In the illustrated example, the frame bases 8a and 8b are formed of square tubes and the struts 9 are formed of H-shaped steel. However, the specific structures of the frame bases 8a and 8b and the struts 9 can be modified as appropriate. The main beams 3a and 3b, the struts 9, and the frame bases 8a and 8b can be joined to each other by welding.

[0057] The support 9 is preferably also arranged between the main beams 3a, 3b and the frame base 8a, 8b on the frame installation surface Si side of the pressure plate mounting plate 4. In this case, the load that the pressure plate mounting plate 4 receives from the fixed pressure plate 32a is effectively supported by the support 9.

[0058] In particular, in this case, as in the embodiment shown in the figure, the outer end Ee of the pressure plate mounting plate 4 preferably has a length in the longitudinal direction that overlaps with the arrangement area Ap of the support 9 of the pressure plate mounting plate 4. In other words, Figure 5 As shown in (a), it is preferable to determine the length of the outer end Ee in the longitudinal direction of the platen mounting plate 4 in such a manner that at least a portion of the region in the longitudinal direction of the outer end Ee overlaps at least a portion of the configuration region Ap in the longitudinal direction of the support 9. As a result, the support 9 can more effectively support the load borne by the platen mounting plate 4 from the fixed platen 32a. In this embodiment, two support columns 9 are arranged on the frame installation surface Si side of the platen mounting plate 4, and the movable platen 32b side ( Figure 6 The support 9 (left side in (a)) has a configuration area Ap that overlaps with the area of ​​the outer end Ee of the pressure plate mounting plate 4 in the length direction. Here, it is sufficient to overlap with the configuration area Ap of at least one of the two support columns 9. As in the present embodiment, the outer end Ee of the pressure plate mounting plate 4 is sometimes preferably extended toward the movable pressure plate 32b side by a length that does not exceed the configuration area Ap of the support column 9 on the frame setting surface Si side. In addition, a plate 9a that blocks the gap between the two support columns 9 on the frame setting surface Si side of the pressure plate mounting plate 4 is arranged between them.

[0059] In the mold clamping device side frame 2a, at a position just below the platen mounting plate 4 as described above, Figure 8As shown in the figure with the pressure plate mounting plate 4 removed, a connecting beam 10 is provided that extends between the pair of main beams 3a and 3b in the width direction and connects the main beams 3a and 3b to each other. The connecting beam 10 also includes a portion of the inner portion Pi of the pressure plate mounting plate 4, but is primarily provided with a center plate component 5c, and the connecting beam 10 and the center plate component 5c are welded. The provision of the connecting beam 10 is preferred because it can reinforce the main beams 3a and 3b in the width direction against external forces transmitted from the fixed pressure plate 32a to the pressure plate mounting plate 4 and the main beams 3a and 3b. Here, the connecting beam 10 is composed of two square tubes spaced apart in the longitudinal direction, and the end faces of these square tubes are welded to the inner side surfaces 3c of the main beams 3a and 3b. The connecting beam 10 can be provided as one, three, or more square tubes, or it can be composed of components other than square tubes.

[0060] From the perspective of preventing weld cracks, the protruding edge 6 of the platen mounting plate 4 is preferably positioned longitudinally closer to the movable platen 32b than the side surface of the connecting beam 10 directly below it, which is on the movable platen 32b side. Meanwhile, the outer edge Ed1 of the inner portion Pi of the platen mounting plate 4, which is on the movable platen 32b side, is preferably positioned longitudinally flush with the side surface of the connecting beam 10 on the movable platen 32b side. This is to ensure sufficient space Se for removing the molded product.

[0061] Each of the main beams 3a and 3b may be composed of two or more beam members joined together by welding. However, in the illustrated example, it may include a single beam member such as a square tube joined together by welding.

[0062] On the beam members constituting each main beam 3a, 3b, a long guide plate 11 extending parallel to the beam member in the longitudinal direction is disposed offset to the outside in the width direction. A guide member 32d is laid on the guide plate 11. The guide member 32d is provided with a movable platen 32b and guides the movable platen 32b in its movement away from and toward the fixed platen 32a.

[0063] The guide plate 11 is adjacent to the platen mounting plate 4 in the longitudinal direction. The end of the guide plate 11 on the injection unit 21 side contacts the outer edge Ed1 of the platen mounting plate 4 on the movable platen 32b side, more specifically, the protruding edge 6. In the illustrated example, the guide plate 11 has approximately the same thickness as the platen mounting plate 4, and their surfaces facing the mold clamping unit 31 are substantially flush with each other.

[0064] The molded product removal space Se is provided between the main beams 3 a and 3 b on the movable platen 32 b side of the platen mounting plate 4 .

[0065] The frame bases 8a and 8b can be formed of, for example, a square pipe.

[0066] The frame bases 8 a and 8 b are connected to each other by connecting members 16 extending in the width direction. One of the connecting members 16 is located on the frame installation surface Si side of the pressure plate mounting plate 4 .

[0067] The injection unit-side frame 2b also includes injection-side beams 17a and 17b, made of square tubes, extending side by side in the longitudinal direction at intervals in the width direction of the base 2; injection-side frame bases 18a and 18b, made of square tubes, located directly below and extending parallel to the injection-side beams 17a and 17b; and a plurality of injection-side connecting members 20 provided at intervals in the longitudinal direction between the injection-side frame bases 18a and 18b. Long plates 17c are disposed along the entire longitudinal direction of the injection-side beams 17a and 17b.

[0068] The injection unit side frame 2b and the mold clamping unit side frame 2a are connected to each other with a connecting plate 2c having a shape that mirrors the side portion of the mold clamping unit side frame 2a sandwiched therebetween. The connecting plate 2c is formed so that its end on the injection unit side frame 2b side in the longitudinal direction of the mold clamping unit side frame 2a protrudes upward from a flat plate member 2d provided between the main beams 3a and 3b.

[0069] (Other bases)

[0070] The base 2 of the illustrated embodiment is Figure 2 The partially enlarged view in FIG. 2 shows a structure composed of a plurality of beams or components including beams and pillars. The base 2 shown in the figure includes a mold clamping device side frame 2a on which the mold clamping device 31 is mounted. Figure 3 As shown, a fixed platen 32a is mounted on the mold clamping unit side frame 2a. Furthermore, the base 2 also includes an injection unit side frame 2b connected to the end of the mold clamping unit side frame 2a and mounting the injection unit 21. The details of the injection unit side frame 2b will be described later. Although not shown, there are also bases in which the mold clamping unit side frame and the injection unit side frame are integrated. Such bases mount not only the mold clamping unit but also the injection unit, etc.

[0071] The mold clamping device side frame 2a mainly comprises: a pair of main beams 3a and 3b, which are spaced apart from each other in the width direction of the base 2 (in the horizontal plane, in a direction perpendicular to the direction in which the fixed pressure plate 32a and the movable pressure plate 32b of the mold clamping device 31 separate and approach each other) and extend side by side along the length direction of the base 2 (in the direction in which the fixed pressure plate 32a and the movable pressure plate 32b of the mold clamping device 31 separate and approach each other); and a pressure plate mounting plate 4, which is arranged on the main beams 3a and 3b near the end portion on the injection device side frame 2b side. In this embodiment, the pressure plate mounting plate 4 is composed of two side plate components 5a and 5b that are divided in the width direction of the base 2 and arranged on each main beam 3a and 3b. In addition, between the two side plate components 5a and 5b in the width direction, as shown in FIG. Figure 2 As shown, for example, a center plate member 5c thinner than the side plate members 5a and 5b is provided, and the outer end in the width direction of the center plate member 5c is welded to the inner ends Ei in the width direction of the side plate members 5a and 5b.

[0072] like Figure 3 As shown, the fixed pressure plate 32a is mounted on the pressure plate mounting plate 4. More specifically, in the illustrated example, the fixed pressure plate 32a has a substantially rectangular plate shape, such as a square, with rounded corners when viewed from the front. A pair of block-shaped legs 32e, such as a pair of legs 32e, are provided on the bottom surface of its lower end. These legs 32e protrude from the bottom surface at intervals in the width direction of the base 2 and have a step on the outer side in the width direction. Formed at each corner of the plate-shaped fixed pressure plate 32a are through-holes 32f through which connecting rods 32c pass, and recesses 32g, which recess the surface surrounding the through-holes 32f relative to the rest of the plate. Meanwhile, on each of the side plate members 5a and 5b of the pressure plate mounting plate 4, pressure plate fixing portions for securing each of the legs 32e are provided at positions corresponding to the locations of the legs 32e. The fixing portion of the pressure plate is omitted as an example, but can be set as a hole portion for inserting bolts for fastening to each leg portion 32e of the fixed pressure plate 32a. However, the mounting method of the fixed pressure plate 32a is not limited to this. In addition, the movable pressure plate 32b is Figure 3 Although not shown, the fixed platen 32a is spaced apart from the fixed platen 32a on the side opposite to the injection device side frame 2b in the longitudinal direction of the base 2, and the spacing changes according to the operation of the platen operating mechanism 33.

[0073] The pressing plate mounting plate 4 is welded and joined to the main beams 3a and 3b at the welding portion. The welding portion between the pressing plate mounting plate 4 and the main beams 3a and 3b includes the following: Figure 2 、 Figure 9 and Figure 10The illustrated platen mounting plate 4 includes at least one of the outer edges Ed1 and Ed2 in the longitudinal direction of the base 2. The welded portions of the outer edges Ed1 and / or Ed2 can be modified as appropriate. However, in this example, a portion of the inner width of the outer edge Ed1 on the movable platen 32b side of the platen mounting plate 4 is welded to the main beams 3a and 3b. The outer edge Ed2 on the injection unit 21 side of the platen mounting plate 4 is entirely welded to the main beams 3a and 3b. Furthermore, in this embodiment, the side plate members 5a and 5b of the platen mounting plate 4 are welded to the main beams 3a and 3b not only at the outer edges Ed1 and Ed2 but also at the outer end Ee located on the outer side of the base 2 in the width direction. Therefore, this outer end Ee also serves as a welded portion. As long as at least a portion of the outer edges Ed1, Ed2, or the outer end Ee of the platen mounting plate 4 is welded to the main beams 3a and 3b, it can be considered a welded portion.

[0074] When the platen mounting plate has welds as described above, various external forces acting on the fixed platen can cause weld cracks in these welds. More specifically, in a fixed platen whose lower end is fixed to a base and has connecting rods attached to its four corners, when the mold assembly is in a closed state, the lower end and four corners are constrained, and the pressed center portion of the mold assembly can deform, bulging toward the injection molding machine and tilting toward the movable platen. This deformation can cause the legs at the lower end of the fixed platen to deform inward in the width direction. In this case, external forces acting inward in the width direction act on the pair of main beams via the platen mounting plate, which is welded to the main beams and to which the legs of the fixed platen are attached. This external force can cause weld cracks in the welds between the main beams and the platen mounting plate. This becomes more pronounced in high-cycle molding, where molded products are repeatedly produced in short cycles.

[0075] In contrast, in this embodiment, a connecting beam 10 is provided on the frame mounting surface Si side of the pressure plate mounting plate 4. This connecting beam 10 extends between the pair of main beams 3a and 3b in the width direction, connecting the main beams 3a and 3b. With this structure, the connecting beam 10, located between the main beams 3a and 3b, extends to resist external forces acting on the main beams 3a and 3b from the legs 32e of the fixed pressure plate 32a via the pressure plate mounting plate 4. This reduces the stress on welds and other components caused by these external forces, effectively preventing weld cracks. Consequently, the durability of the base 2 can be improved.

[0076] Specifically, the connecting beam 10 can be composed of one or more connecting beam members 10a, 10b. Figure 11As shown in the middle part where the pressure plate mounting plate 4 is removed, the connecting beam 10 is composed of two or more connecting beam components 10a, 10b, which is preferred in terms of being able to further effectively resist the external force directed inward in the width direction toward the main beams 3a, 3b. Each connecting beam component 10a, 10b can be composed of components of various shapes. The connecting beam components 10a, 10b illustrated in this specification use cylindrical square tubes whose inner and outer contours of the cross section perpendicular to the axial direction are rectangular, such as square or rectangular, so that the required resistance in the axial direction can be fully exerted. Here, each connecting beam component 10a, 10b is arranged with the four surfaces around the square tube of its rectangular cross section parallel to the longitudinal direction or the height direction (the vertical direction perpendicular to the longitudinal direction and the width direction). However, the connecting beam components 10a, 10b can be composed of components other than square tubes. Furthermore, each end portion of the connecting beam 10 , specifically, each end portion of the connecting beam members 10 a and 10 b can be welded to the inner side surfaces 3 c of the main beams 3 a and 3 b , respectively.

[0077] like Figures 9-11 As shown, the two connecting beam members 10a and 10b constituting the connecting beam 10 can be arranged to be separated from each other in the longitudinal direction. Although not shown in the figure, when three or more connecting beam members are provided, at least one pair of connecting beam members adjacent in the longitudinal direction can be arranged to be separated from each other in the longitudinal direction.

[0078] Here, the connecting beam members 10a and 10b adjacent to each other separated in the longitudinal direction may have the same longitudinal dimensions (i.e., beam widths). However, when the adjacent connecting beam members 10a and 10b are separated, as shown in FIG. Figure 12 As shown in (a), the adjacent connecting beam members 10a and 10b preferably have different longitudinal dimensions. More specifically, the longitudinal dimension Wa of one connecting beam member 10a located on the movable platen 32b side can be larger than the longitudinal dimension Wb of the other connecting beam member 10b located on the injection unit 21 side. However, it is more preferred that the longitudinal dimension Wa of the connecting beam member 10a on the movable platen 32b side be smaller than the longitudinal dimension Wb of the connecting beam member 10b on the injection unit 21 side. The connecting beam member 10a on the movable platen 32b side is often located further toward the movable platen 32b side than the platen fixing portion of the platen mounting plate 4 in the longitudinal direction. However, by relatively reducing the longitudinal dimension Wa of this connecting beam member 10a, the narrow beam member 10a can exhibit greater resistance to bending caused by vertical downward external forces in the direction of the fixed platen 32a's tilt. On the other hand, the connecting beam member 10 b on the injection device 21 side having a relatively large longitudinal dimension Wb can effectively support the load caused by the weight received from the fixed platen 32 a .

[0079] Or, as Figure 12 As shown in (b), the two connecting beam members 10a and 10b constituting the connecting beam 10 can also be arranged in contact with each other in the longitudinal direction. In this case, the adjacent connecting beam members 10a and 10b can be joined by bringing their side surfaces into contact with each other and welding at least a portion of their adjacent corners, for example, continuously or intermittently in the width direction. In the case where the connecting beam includes three or more connecting beam members, although not shown, at least one pair of longitudinally adjacent connecting beam members can be arranged in contact with each other in the longitudinal direction.

[0080] When the connecting beam components 10a and 10b are arranged in contact with each other in the longitudinal direction, these adjacent connecting beam components 10a and 10b preferably have equal height dimensions (i.e., beam heights). If connecting beam components with different beam heights are arranged in contact, the corner of the connecting beam component with a lower beam height abuts against the side of the connecting beam component with a higher beam height. Due to the stress concentration there, the connecting beam component with a higher beam height may be deformed. The equal dimensions mentioned here do not require the dimensions of the two to be strictly consistent, but allow for differences in the degree of tolerance that may occur in the manufacture of connecting beam components such as square tubes. As for the equal height dimensions, if the difference in dimensions is possible in products that can be purchased on the market, it can be regarded as connecting beam components having equal height dimensions.

[0081] Furthermore, the height dimension of the connecting beam members 10a, 10b can be set to be approximately the same as the height dimension of the main beams 3a, 3b, for example. In this case, the front and back surfaces of the connecting beam members 10a, 10b and the front and back surfaces of the main beams 3a, 3b are aligned on substantially the same plane.

[0082] The illustrated mold clamping unit side frame 2a further includes a pair of frame bases 8a and 8b spaced apart from the main beams 3a and 3b on the frame installation surface Si side (vertically downward) of the pair of main beams 3a and 3b and extending in the longitudinal direction, and a plurality of struts 9 disposed between the main beams 3a and 3b and the frame bases 8a and 8b and extending in the height direction (vertically). In the illustrated example, the frame bases 8a and 8b are formed of square tubes and the struts 9 are formed of H-shaped steel. However, the specific structures of the frame bases 8a and 8b and the struts 9 can be modified as appropriate. The main beams 3a and 3b, the struts 9, and the frame bases 8a and 8b can be joined to each other by welding.

[0083] The support 9 is also preferably arranged between the main beams 3a, 3b and the frame base 8a, 8b on the frame setting surface Si side of the pressure plate mounting plate 4 and the connecting beam 10. In this case, the load that the pressure plate mounting plate 4 receives from the fixed pressure plate 32a is effectively supported by the support 9.

[0084] In particular, in this case, Figure 10 As shown in (b), it is preferable to arrange these connecting beams 10 and pillars 9 in the longitudinal direction so that the arrangement area Ab of at least one of the connecting beam members 10a and 10b constituting the connecting beam 10 overlaps with the arrangement area Ap of the pillar 9 located on the frame installation surface Si side of the connecting beam 10. Here, it is sufficient that the arrangement area Ab of at least one of the two connecting beam members 10a and 10b overlaps with the arrangement area Ap of at least one of the two pillars 9. Figure 10 As shown in the example of (b), if the arrangement area Ab of the connecting beam member 10a on the movable platen 32b side overlaps with the arrangement area Ap of the support pillar 9 on its frame installation surface Si side, the support pillar 9 effectively supports the main beams 3a, 3b and the connecting beam 10 against external forces in the direction of the fixed platen 32a's tilt. Furthermore, although not shown in the figure, if the arrangement area of ​​the connecting beam member on the injection unit side overlaps with the arrangement area of ​​the support pillar on its frame installation surface side, the support pillar can effectively support the load caused by the weight received by the fixed platen.

[0085] In the illustrated example, the platen mounting plate 4, mounted on the connecting beam 10, has a shape that is longer in the longitudinal direction at its outer end Ee than at its inner portion Pi in the width direction of the base 2. More specifically, a protruding edge 6 is formed on the outer portion of the platen mounting plate 4, including the outer end Ee in the width direction, protruding further outward in the longitudinal direction than the inner portion Pi. Consequently, a recessed space 7, for example, in a rectangular shape when viewed from above, is formed in the inner portion Pi of the platen mounting plate 4, adjacent to the outer edge Ed1 on the movable platen 32b side. This recessed space 7 forms part of the molded product removal space Se provided below the fixed platen 32a and movable platen 32b. The side surface of the platen mounting plate 4 facing the outer edge Ed1 of the recessed space 7 is L-shaped when viewed from above. The widthwise length of the protruding edge 6 can be equal to or shorter than the width of the main beam 3a.

[0086] The inner ends Ei of the side panel members 5a and 5b can protrude further inward in the width direction than the inner side surfaces 3c of the main beams 3a and 3b to which they are mounted. Meanwhile, the outer ends Ee of the side panel members 5a and 5b can be substantially aligned with the outer side surfaces 3f of the main beams 3a and 3b in the width direction when viewed from above, being substantially flush with the outer side surfaces 3f. In this example, both the inner ends Ei and the outer ends Ee of the side panel members 5a and 5b extend linearly in the longitudinal direction.

[0087] The pressure plate mounting plate 4 disposed on the connecting beam 10 does not include the aforementioned side plate members 5a and 5b divided into two, but is as follows Figure 13 The structure shown in the figure can also include an integrated mounting plate member 5f spanning between a pair of main beams 3a and 3b. Figure 13 In the plan view, the bridge plate member 5f extends over the entire width direction between the outer side surfaces 3f of the main beams 3a and 3b.

[0088] Even in the case where the pressure plate mounting plate 4 is composed of any one of the divided side plate parts 5a, 5b or the integrated mounting plate part 5f, the connecting beam 10 can be joined to the plate parts arranged thereon, i.e., the side plate parts 5a, 5b and the center plate part 5c or the mounting plate part 5f therebetween, by welding at least a portion thereof.

[0089] And, as Figure 14 As shown, the side plate members 5a, 5b, and center plate member 5c of the platen mounting plate 4 can be arranged slightly offset, for example, toward the movable platen 32b, relative to the longitudinally outward side surfaces of the connecting beam 10. Here, the outer edges of the side plate members 5a, 5b, and center plate member 5c on the movable platen 32b side slightly protrude from the longitudinally outward side surfaces of the connecting beam 10, closer to the movable platen 32b. Furthermore, the outer edges of the side plate members 5a, 5b, and center plate member 5c on the injection unit 21 side are slightly retracted longitudinally inward from the longitudinally inward side surfaces of the connecting beam 10. This facilitates welding of the side plate members 5a, 5b, and center plate member 5c to the connecting beam 10, as well as welding of the flat plate member 2d, which is longitudinally disposed between the connecting beam 10 and the injection unit-side frame 2b, to the connecting beam 10. These welded portions may be discontinuous or continuous in the width direction. Similarly, when the pressure plate mounting plate 4 is composed of the mounting plate member 5f, the mounting plate member 5f can be arranged offset in the longitudinal direction between the side surfaces of the connecting beam 10 facing the outer side in the longitudinal direction.

[0090] Each of the main beams 3a and 3b may be composed of two or more main beam members joined together by welding. However, in the illustrated example, a main beam member 3e such as a square tube joined together by welding may be provided.

[0091] On the main beam members 3e constituting each of the main beams 3a and 3b, an elongated guide plate 11 extending longitudinally parallel to the main beam members 3e is disposed offset to the outside in the width direction. A guide member 32d is laid on the guide plate 11. The guide member 32d is provided with a movable platen 32b and guides the movable platen 32b in its movement away from and toward the fixed platen 32a.

[0092] The guide plate 11 is adjacent to the platen mounting plate 4 in the longitudinal direction. The end of the guide plate 11 on the injection unit 21 side contacts the outer edge Ed1 of the movable platen 32b side of the platen mounting plate 4, more specifically, the aforementioned protruding edge 6. In the illustrated example, the guide plate 11 has approximately the same thickness as the platen mounting plate 4, and their surfaces facing the mold clamping unit 31 are substantially flush with each other.

[0093] The molded product removal space Se described above is provided between the main beams 3 a and 3 b on the movable platen 32 b side of the platen mounting plate 4 in the longitudinal direction.

[0094] The frame bases 8a and 8b can be formed of, for example, square tubes, etc. The frame bases 8a and 8b are connected to each other by connecting members 16 extending in the width direction, and one or more of the connecting members 16 are located on the frame installation surface Si side of the aforementioned pressure plate mounting plate 4.

[0095] The injection unit-side frame 2b also includes injection-side beams 17a and 17b, made of square tubes or the like, extending side by side in the longitudinal direction at intervals in the width direction of the base 2; injection-side frame bases 18a and 18b, made of square tubes or the like, located directly below and extending parallel to the injection-side beams 17a and 17b; and a plurality of injection-side connecting members 20 provided at intervals in the longitudinal direction between the injection-side frame bases 18a and 18b. Long plates 17c are disposed along the entire longitudinal direction of the injection-side beams 17a and 17b.

[0096] The injection unit side frame 2b and the mold clamping unit side frame 2a are connected to each other with a connecting plate 2c having a shape that mirrors the side portion of the mold clamping unit side frame 2a sandwiched therebetween. The connecting plate 2c is formed so that its end on the injection unit side frame 2b side in the longitudinal direction of the mold clamping unit side frame 2a protrudes upward from a flat plate member 2d provided between the main beams 3a and 3b.

[0097] (Injection device)

[0098] The injection unit 21 mainly includes a cylinder 22, which is cylindrical or similar in shape and extends toward the mold unit 101; a screw 23, which is disposed within the cylinder 22 parallel to its central axis and has a helical thread formed around its circumference; a heater 24, which is in the form of a belt or similar and is disposed on the outer circumference of the cylinder 22 so as to surround the cylinder 22; and a motor box 25, which is disposed behind the cylinder 22 and the screw 23. Although not shown in the figure, the motor box 25 includes a metering motor that rotates the screw 23 about its central axis to store a predetermined amount of molding material at the front end of the cylinder 22; an injection motor that advances and retracts the screw 23 in directions toward and away from the mold unit 101; and a pressure sensor that detects the pressure applied to the screw 23 by the molding material.

[0099] In addition, here, the direction of the fixed platen 32a of the mold clamping device 31 close to the fixed mold 102 of the mold installation device 101 is set as the front side, and the direction away from the fixed platen 32a is set as the rear side. Figure 1 When the injection device 21 is positioned on the right side of the fixed platen 32a, the left direction closer to the fixed platen 32a is the front side, and the right direction farther from the fixed platen 32a is the rear side.

[0100] A supply port 22a, which can be mounted on the rear side of the cylinder body 22 and in front of the motor box 25, is provided for feeding the molding material into the cylinder body 22. Furthermore, a nozzle 22b with a reduced cross-sectional area is provided on the front side of the front end of the cylinder body 22, which is close to the mold assembly 101. Furthermore, a water-cooled cylinder 22c, which is cooled by water or the like, can be provided near the supply port 22a.

[0101] The heater 24 arranged around the cylinder 22 including the nozzle 22b is, for example, divided into a plurality of sections in the cylinder axial direction as shown in the figure, and can heat the interior of the cylinder 22 inside each heater section at different temperatures. A temperature detector can be provided in each heater section.

[0102] A check ring (not shown) may be disposed around the constricted portion of the screw 23 at the front end, where the screw 23's outer diameter is partially reduced. This check ring prevents the molding material, which has been moved forward and backward along with the screw 23 and conveyed to the front, from flowing back to the rear. For example, the check ring moves forward and backward relative to the screw 23 in response to pressure from the molding material located in front of or behind the screw 23, thereby allowing only the molding material to flow from the rear toward the front.

[0103] According to the injection device 21 having such a structure, the molding material injected into the cylinder 22 from the supply port 22a is heated by the heater 24 on the outer peripheral side of the cylinder 22 during the metering process. As the screw 23 driven by the metering motor rotates, it is melted while being transported forward within the cylinder 22 and stored at the front end of the cylinder 22. At this time, the screw 23 is moved backward by the injection motor, forming a space for storing the molding material at the front end of the cylinder 22. In addition, as described above, this metering process can be performed during the cooling process of the previous molding process, etc.

[0104] Then, in the filling process, screw 23 is moved forward, and the molding material at the front end of cylinder 22 is injected through nozzle 22b toward mold device 101. Furthermore, during this pressure holding process, the molding material remaining at the front end of cylinder 22 exerts pressure on the molding material being filled into the cavity of mold device 101. This replenishes any molding material that has become insufficient in the cavity of mold device 101 due to cooling and shrinkage of the molding material.

[0105] In addition, the injection molding machine 1 is of an inline screw type, but may also be a screw pre-plasticizing type injection molding machine which is structurally and functionally divided into a plasticizing cylinder and a plasticizing screw and an injection cylinder and an injection plunger.

[0106] (Mobile device)

[0107] The moving device 26 is, for example, an advance / retract drive mechanism provided at the lower portion of the motor box 25 of the injection device 21 and configured to move the injection device 21 forward and backward relative to the fixed platen 32 a .

[0108] Various mechanisms can be used as the forward and backward driving mechanism constituting the moving device 26, but the moving device 26 shown in the figure includes a hydraulic pump 27 such as a hydraulic pump, a pump working motor 28 based on electricity or the like for operating the hydraulic pump 27, and a double-acting hydraulic cylinder body 29 that supplies working fluid from the hydraulic pump 27 and causes a piston rod whose front end is fixed on a fixed pressure plate 32a to perform pushing and pulling movements.

[0109] The moving device 26 further includes a slide base 26a on which the hydraulic pump 27, pump operating motor 28, and hydraulic cylinder 29 are mounted, and a guide 26b, which is laid on the base 2 and guides the linear motion of the slide base 26a. This allows the injection device 21, which is mounted on the slide base 26a, to be moved forward and backward.

[0110] By moving the injection device 21 away from the mold device 101 or bringing the injection device 21 closer to the mold device 101 using the moving device 26, so-called nozzle contact can be achieved, that is, the nozzle 22b of the cylinder 22 of the injection device 21 is pressed against the mold device 101 at a predetermined pressure.

[0111] (Mold clamping device)

[0112] The mold clamping device 31 displaces the movable mold 103 relative to the fixed mold 102 of the mold assembly 101 to open and close the mold assembly 101, placing the mold assembly 101 in a clamped, closed, or open state. The mold clamping device 31 includes a platen 32 comprising a fixed platen 32a, a movable platen 32b, and connecting rods 32c, and a platen operating mechanism 33 for operating the platen 32.

[0113] As described above, the fixed platen 32a of the platen 32 is fixed and mounted on the platen mounting plate of the base 2. On the other hand, the movable platen 32b is arranged on a guide member 32d laid on a guide plate of the base 2 and is slidable in a direction away from and toward the fixed platen 32a.

[0114] The pressure plate operating mechanism 33 includes a rear pressure plate 34 arranged on the base 2, a mold clamping motor 35 provided on the rear pressure plate 34, a motion conversion mechanism 36 that converts the rotational motion of the mold clamping motor 35 into linear motion in the displacement direction of the movable pressure plate 32b, and a toggle mechanism 37 that increases the force transmitted to the motion conversion mechanism 36 and transmits it to the movable pressure plate 32b.

[0115] The motion conversion mechanism 36 can be configured as any of various structures capable of converting rotational motion into linear motion. However, in this example, it comprises a screw shaft 36a that is rotationally driven by the mold clamping motor 35 and a nut 36b that is threadedly engaged with the screw shaft 36a. A ball screw can also be used as the motion conversion mechanism 36.

[0116] The toggle mechanism 37 for increasing the transmission force from the motion conversion mechanism 36 is a mechanism in which a plurality of links 37a to 37c connecting the rear pressure plate 34 and the nut 36b to the movable pressure plate 32b are swingably connected via joints.

[0117] The number and shape of the connecting rods and joints can be changed appropriately, but Figure 1 As shown, a pair of link groups consisting of links 37a to 37c located above and below the cross head 37d is swingably connected to a cross head 37d connected to the nut 36b and extending in the vertical direction.

[0118] Furthermore, in addition to the aforementioned mold clamping motor 35, a mold thickness adjustment motor 38 can be provided on the rear platen 34. This mold thickness adjustment motor 38 applies rotational driving force to the screw shaft and nut connected to the extensions of the connecting rods 32c of the platen 32, thereby adjusting the gap between the fixed platen 32a and the rear platen 34, which is movably mounted on the base 2. This allows the mold thickness to be adjusted to achieve the desired clamping force when replacing the mold assembly 101 or changing the thickness of the mold assembly 101 due to temperature fluctuations. Although not shown in the figure, mold thickness adjustment can be achieved even if the fixed platen side is movable and the rear platen side is fixed on the base 2.

[0119] The mold clamping device 31 shown in the figure is a horizontal device in which the moving direction of the movable platen 32b is parallel to the horizontal direction, but it may also be a vertical device in which the moving direction is the vertical direction.

[0120] (Ejector device)

[0121] The ejection device 41 arranged on the movable pressure plate 32b includes: an ejection rod 42, which penetrates the movable pressure plate 32b and extends, and is driven forward and backward in a manner that pushes the movable parts 104 such as the ejection pin of the mold device 101 from the rear side; and a rod driving source 43, such as a motion conversion mechanism including a motor and a ball screw, so as to make the ejection rod 42 work.

[0122] During the molded product removal process, the ejector device 41 advances the ejector rod 42, which is driven by a rod drive source 43, to project the movable member 104 within the mold device 101, thereby ejecting the molded product from the mold device 101. Furthermore, after projecting the movable member 104, the ejector rod 42 can be retracted by the rod drive source 43 to return to its original position.

[0123] Explanation of symbols

[0124] 1-Injection molding machine, 2-Base, 2a-Mold clamping device side frame, 2b-Injection device side frame, 2c-Connecting plate, 2d-Flat plate component, 3a, 3b-Main beam, 3c-Inner side of main beam, 3f-Outer side of main beam, 3e-Main beam component, 4-Press plate mounting plate, 5a, 5b-Side plate components, 5c-Center plate component, 6-Protruding edge, 7-Vacant position, 8a, 8b-Frame base, 9-Pillar, 9a-Plate, 10-Connecting beam, 10a, 10b-Connecting beam components, 11-Guide plate , 16-connecting parts, 17a, 17b-injection side beams, 17c-long plates, 18a, 18b-injection side frame bases, 20-injection side connecting parts, 21-injection device, 22-cylinder body, 22a-supply port, 22b-nozzle, 22c-water-cooled cylinder, 23-screw, 24-heater, 25-motor box, 26-moving device, 27-hydraulic pump, 28-pump working motor, 29-hydraulic cylinder, 26a-sliding base, 26b-guide, 31-mold clamping device, 32-pressing plate, 32a-Fixed pressure plate, 32b-Movable pressure plate, 32c-Connecting rod, 32d-Guide component, 32e-Support foot, 32f-Through hole, 32g-Concave portion, 33-Pressing plate operation mechanism, 34-Rear pressure plate, 35-Mold clamping motor, 36-Motion conversion mechanism, 36a-Screw shaft, 36b-Nut, 37-Toggle mechanism, 37a~37c-Connecting rod, 37d-Crosshead, 38-Mold thickness adjustment motor, 41-Ejector device, 42-Ejector rod, 43-Rod drive source, 101-Mold device , 102-fixed mold, 103-movable mold, 104-movable part, Si-frame setting surface, Ed1, Ed2-outer edge of the pressure plate mounting plate in the length direction, Ee-outer end of the pressure plate mounting plate in the width direction, Pi-inner part of the pressure plate mounting plate in the width direction, Ei-inner end of the side plate part in the width direction, Se-molded product removal space, Ap-configuration area of ​​the pillar in the length direction, Ab-configuration area of ​​the connecting beam part in the length direction, Wa, Wb-dimensions of the connecting beam part in the length direction.

Claims

1. A base for use in an injection molding machine having a mold clamping device with a pressure plate, for placing at least the mold clamping device on and supporting the mold clamping device, the base comprising: a pair of main beams spaced apart from each other in the width direction of the base and extending side by side along the length direction of the base; and A pressure plate mounting plate is arranged on the main beam and is installed with the pressure plate. The outer edge portion of the pressure plate mounting plate in the longitudinal direction includes a welding portion joined to the main beam by welding, and the pressure plate mounting plate has a shape in which the length in the longitudinal direction is longer at the outer end than at the inner portion in the width direction. The pressing plate has a pair of legs spaced apart from each other in the width direction. The pressure plate mounting plate has a pair of pressure plate fixing portions for fixing to each of the pair of support legs. The pair of pressure plate fixing portions are respectively arranged only within a range where the inner portion extends in the longitudinal direction.

2. The base according to claim 1, wherein At least one of the outer edge portions of the pressure plate mounting plate has a protruding edge portion protruding further outward in the longitudinal direction than the inner portion, at an outer portion including the outer end in the width direction. The outer edge portion near the outer end is located farther from the pressure plate fixing portion in the longitudinal direction than the outer edge portion of the inner portion.

3. The base according to claim 1 or 2, further comprising: a pair of frame bases, arranged at intervals from the main beams on the frame installation surface sides of the respective pair of main beams, and extending in the longitudinal direction; and A support column is provided between the main beam and the frame base, The outer end of the pressure plate mounting plate has a length in the longitudinal direction that overlaps with an arrangement region of the support column located on the frame installation surface side of the pressure plate mounting plate.

4. The base according to claim 1 or 2, wherein: A fixed pressing plate is installed on the pressing plate mounting plate. The base further includes a pair of guide plates, which are arranged on each main beam adjacent to the movable platen side of the platen mounting plate and are provided with guide components for guiding the separation and approach displacement of the movable platen relative to the fixed platen.

5. The base according to claim 1, wherein A connecting beam is further provided, the connecting beam extending between the pair of main beams in the width direction on the frame installation surface side of the pressure plate mounting plate and connecting the main beams.

6. The base according to claim 5, wherein The connecting beam includes two or more connecting beam members extending in the width direction.

7. The base according to claim 6, further comprising: a pair of frame bases, arranged at intervals from the main beams on the frame installation surface sides of the respective pair of main beams, and extending in the longitudinal direction; and A support column is provided between the main beam and the frame base, In the longitudinal direction, the arrangement region of at least one of the connecting beam members overlaps with the arrangement region of the support columns located on the frame installation surface side of the connecting beam.

8. The base according to any one of claims 5 to 7, wherein: The plate member disposed on the connecting beam is joined to the connecting beam at least partially by welding.

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