Injection device

Abstract

The purpose is to provide an injection device capable of suppressing bending of an injection platform. The injection device (30) comprises a heating cylinder (31), a drop port block (35) supporting the heating cylinder (31), an injection platform (36) supporting the drop port block (35) and extending in a manner perpendicular to the long axis (31a) of the heating cylinder (31), and a pair of injection device moving mechanisms (42) for moving the heating cylinder (31); a support platform (70) extending in a direction perpendicular to the long axis (31a) is provided on the drop port block (35); the injection device moving mechanism (42) is mounted on the support platform (70) and a fixed plate (24). Since the support platform (70) is provided, the injection platform (36) does not deform.

Description

Technical Field

[0001] The present invention relates to an injection device arranged corresponding to a mold clamping device. Background Art

[0002] The injection molding device mainly includes a mold clamping device and an injection device. The injection device mainly includes a heating cylinder. The heating cylinder is moved by the injection device moving mechanism, and the nozzle is abutted against the metal mold. Then, the resin material is injected from the heating cylinder into the metal mold.

[0003] Conventionally, various types of injection devices having a heating cylinder as a main part are known (for example, see Patent Document 1 ( Figure 2 , Figure 4 )).

[0004] Patent document 1 is described based on the following figure.

[0005] Fig.10 This is a diagram for explaining the basic structure of the conventional technology.

[0006] like Fig.10 As shown in (a), the injection molding device 100 includes a mold clamping device 101 and an injection device 111 as main parts.

[0007] The mold clamping device 101 includes a fixed platen 103 fixed to a base 102, tie rods 104 extending from the fixed platen 103, and a movable platen 105 guided by the tie rods 104. A fixed mold 106 is mounted on the fixed platen 103, and a movable mold 107 is mounted on the movable platen 105.

[0008] The injection device 111 mainly includes a heating cylinder 112, which is movably mounted on a table 113. The heating cylinder 112 and the like are moved by an injection device moving mechanism 114, and a nozzle 115 at the front end of the heating cylinder 112 contacts the fixed mold 106 (or fixed plate 103).

[0009] exist Fig.10 In the structure of (a), only the lower end of the fixed plate 103 is fixed to the base 102. The fixed plate 103 is fixed only at the lower end and is a cantilever beam extending upward. The cantilever beam has the largest deflection at its front end (upper end).

[0010] Therefore, when the fixed plate 103 is pushed by the nozzle 115, it falls to the left in the figure.

[0011] exist Fig.10 (b) discloses an injection device 120 having a structure capable of eliminating the collapse.

[0012] like Fig.10As shown in (b), the improved injection device 120 consists of an upper rod 122 and a lower rod 123 extending from a fixed plate 121, an injection drive table 125 connected to the front ends of these rods 122, 123 and fixed on a workbench 124, an injection drive component 126 mounted on the injection drive table 125, an upper cylinder 127 and a lower cylinder 128 surrounding the rods 122, 123 and movably mounted on the rods 122, 123, a first injection table 131 fixed to one end of these cylinders 127, 128 and supporting a heating cylinder 129, and a second injection table 132 fixed to the other end of the cylinders 127, 128 and driven by the injection drive component 126.

[0013] The second injection stage 132, the cylinders 127 and 128, and the first injection stage 131 are moved together by the injection driving unit 126. By this movement, the nozzle 133 at the front end of the heating cylinder 129 is brought into contact with the fixed plate 121 (or fixed mold).

[0014] The fixed plate 121 is restrained from horizontal movement by the upper rod 122 and the lower rod 123 , so that it is restrained from falling down.

[0015] However, the improved injection device 120 also has the following problems.

[0016] First, due to the reaction force of the nozzle contact, the first injection table 131 is bent as shown by line A. The greater the reaction force of the nozzle contact, the greater the degree of bending. If the bending becomes larger, the upper cylinder 127 becomes non-free to move relative to the upper rod 122, and the lower cylinder 128 becomes non-free to move relative to the lower rod 123. A structure that suppresses the bending of the first injection table 131 is required.

[0017] Furthermore, since the injection drive stage 125 and the injection drive member 126 are arranged outside the second injection stage 132 , the overall length L1 of the injection device 120 is increased.

[0018] When the injection molding apparatus 120 is required to be compact, an injection molding apparatus having a smaller overall length is required.

[0019] Prior art literature

[0020] Patent Literature

[0021] Patent Document 1: Japanese Patent Application Laid-Open No. 6-134808 Summary of the invention

[0022] Problems to be solved by the invention

[0023] An object of the present invention is to provide an injection device that can suppress bending of an injection table and has a small overall length.

[0024] Means used to solve problems

[0025] The invention related to technical solution 1 is an injection device arranged corresponding to a mold clamping device, characterized in that the above-mentioned mold clamping device has a fixed plate on which a fixed mold is mounted; the above-mentioned injection device has a heating tube, a screw accommodated in the heating tube so as to be rotatable and axially movable, a drop port block supporting the above-mentioned heating tube, an injection table supporting the drop port block and extending in a manner perpendicular to the long axis of the above-mentioned heating tube, a nozzle provided on the front end of the above-mentioned heating tube and injecting a resin material, and a pair of injection device moving mechanisms for moving the above-mentioned heating tube so that the nozzle contacts the above-mentioned fixed mold; the above-mentioned drop port block has a material drop port provided on the base of the above-mentioned heating tube and guiding the dropped resin material into the above-mentioned heating tube; the above-mentioned drop port block is provided with a support platform extending in a direction perpendicular to the above-mentioned long axis, and the above-mentioned injection device moving mechanism is mounted on the support platform and the above-mentioned fixed plate.

[0026] The invention related to technical solution 2 is an injection device described in technical solution 1, characterized in that the above-mentioned support platform is a square cylindrical object; the square cylindrical object is composed of a seat abutting against the above-mentioned drop port block, an upper wall, a lower wall, a front wall and a rear wall extending from the seat in a direction orthogonal to the above-mentioned long axis.

[0027] The invention related to Technical Solution 3 is an injection device according to Technical Solution 2, characterized in that the support platform further includes a reinforcing middle wall parallel to the upper wall and connecting the front wall and the rear wall.

[0028] The invention related to technical solution 4 is an injection device described in technical solution 1, characterized in that the injection device moving mechanism is composed of a hydraulic cylinder installed on the support platform, a relay shaft connected to the piston rod of the hydraulic cylinder and extending to the side of the fixed disk, a flanged metal part connected to the front end of the relay shaft and having a flange with an outer diameter larger than the outer diameter of the relay shaft, and a fixed metal part that detachably fixes the flanged metal part relative to the fixed disk.

[0029] The invention related to technical solution 5 is an injection device described in technical solution 4, characterized in that the front part of the above-mentioned hydraulic cylinder is fixed on the above-mentioned support platform, and the remaining part is not fixed.

[0030] The invention related to technical solution 6 is an injection device related to technical solution 4 or 5, characterized in that the above-mentioned fixed metal part has a through hole with a diameter larger than the outer diameter of the above-mentioned relay shaft and smaller than the outer diameter of the above-mentioned flange; and the above-mentioned relay shaft can be moved to the vicinity of the above-mentioned support platform as a guide part.

[0031] The invention related to technical solution 7 is an injection device arranged corresponding to a mold clamping device, characterized in that the above-mentioned mold clamping device has a fixed plate on which a fixed mold is mounted; the above-mentioned injection device has a heating tube, a screw accommodated in the heating tube so as to be rotatable and axially movable, an injection table supporting the above-mentioned heating tube and extending in a manner perpendicular to the long axis of the above-mentioned heating tube, a nozzle provided at the front end of the above-mentioned heating tube and injecting resin material, and a pair of injection device moving mechanisms for moving the above-mentioned heating tube so that the nozzle contacts the above-mentioned fixed mold; the above-mentioned injection table has a plurality of shafts parallel to the above-mentioned long axis and extending in a direction away from the above-mentioned heating tube, and an injection drive table installed at the front ends of these shafts and arranged parallel to the above-mentioned injection table; the above-mentioned injection table also has a pair of reinforcement frames arranged parallel to the above-mentioned long axis and connecting the above-mentioned injection table to the above-mentioned injection drive table; the above-mentioned injection device moving mechanism spans the reinforcement frames and the above-mentioned fixed plate.

[0032] The invention related to technical solution 8 is an injection device according to technical solution 7, characterized in that the injection device moving mechanism includes a hydraulic cylinder, and the front and rear parts of the hydraulic cylinder are fixed to the reinforcing frame.

[0033] The invention related to technical solution 9 is an injection device arranged corresponding to a mold clamping device, characterized in that the above-mentioned mold clamping device has a fixed plate on which a fixed mold is mounted; the above-mentioned injection device has a heating tube, a screw accommodated in the heating tube so as to be rotatable and axially movable, an injection table supporting the above-mentioned heating tube and extending in a manner perpendicular to the long axis of the above-mentioned heating tube, a nozzle provided on the front end of the above-mentioned heating tube and injecting resin material, and a pair of injection device moving mechanisms for moving the above-mentioned heating tube so that the nozzle contacts the above-mentioned fixed mold; the above-mentioned injection table has a plurality of shafts parallel to the above-mentioned long axis and extending in a direction away from the above-mentioned heating tube, and an injection drive table installed on the front ends of these shafts and arranged in parallel with the above-mentioned injection table; the above-mentioned injection table has a plurality of shafts parallel to the above-mentioned long axis and extending in a direction away from the above-mentioned heating tube, and an injection drive table installed on the front ends of these shafts and arranged in parallel with the above-mentioned injection table; the above-mentioned pair of injection device moving mechanisms are connected to the above-mentioned injection table and the above-mentioned injection drive table.

[0034] The invention related to technical solution 10 is an injection device related to any one of technical solutions 7 to 9, characterized in that the above-mentioned shaft rod comprises a shaft rod main body portion, and a small diameter portion which is arranged at both ends of the shaft rod main body portion and has a smaller diameter than the above-mentioned shaft rod main body portion, and by inserting the above-mentioned small diameter portion into the above-mentioned injection platform and the above-mentioned injection drive platform, the above-mentioned injection drive platform is positioned with respect to the above-mentioned injection platform using the above-mentioned shaft rod main body portion.

[0035] Effects of the Invention

[0036] In the invention related to technical solution 1, a support platform is installed on the drop port block, and an injection device moving mechanism is installed on the support platform. If the injection platform and the fixed plate are connected by the injection device moving mechanism, the injection platform is bent by the reaction force of the nozzle contact.

[0037] In the present invention, the injection device moving mechanism is mounted on the support table which is a separate member from the injection table, and the support table and the fixed plate are connected by the injection device moving mechanism.

[0038] The support table bends due to the reaction force of the nozzle contact, but the injection table, which is a different component, does not bend.

[0039] In addition, the injection device moving mechanism is mounted on a support platform located near the center of the injection device. Therefore, the injection device moving mechanism does not protrude significantly from the injection device. As a result, the overall length of the injection device can be shortened.

[0040] Therefore, according to the present invention, it is possible to provide an injection device in which the bending of the injection table is suppressed and the overall length is small.

[0041] In the invention related to technical solution 2, the support platform is a square tube-shaped object consisting of a seat abutting against the drop port block, an upper wall, a lower wall, a front wall and a rear wall extending from the seat in a direction perpendicular to the long axis.

[0042] Since the support platform is a hollow body, it can be made lighter than a solid body.

[0043] In the invention according to claim 3, the support platform further includes a reinforcing middle wall parallel to the upper wall. By reinforcing the middle wall, the rigidity in the direction in which the external force acts can be increased.

[0044] In the invention according to claim 4, the injection device moving mechanism is composed of a hydraulic cylinder, a relay shaft, a flanged metal member, and a fixing metal member. By separating the fixing metal member from the fixing plate, the injection device moving mechanism can be separated from the fixing plate, and the heating cylinder can be rotated.

[0045] In the invention according to claim 5, the front part of the hydraulic cylinder is fixed to the support platform, and the rest of the hydraulic cylinder is free. When a bending force acts on the piston rod, the hydraulic cylinder tilts, and the influence of the bending is alleviated.

[0046] In the invention according to claim 6, the fixing member includes a through hole having a diameter larger than the outer diameter of the relay shaft and smaller than the outer diameter of the flange.

[0047] Before rotating the injection device, the fixing metal fitting as a heavy object can be moved to the vicinity of the support table. During the movement, the relay shaft can be used as a guide member, so the movement of the fixing metal fitting becomes easy.

[0048] In the invention related to technical solution 7, the injection device includes a heating tube, a screw, an injection table supporting the heating tube, a pair of injection device moving mechanisms, a plurality of shafts extending from the injection table, an injection drive table mounted on the front ends of these shafts, a pair of reinforcement frames connecting the injection table and the injection drive table, and an injection device moving mechanism mounted on the reinforcement frames.

[0049] Since the injection table and the injection drive table are connected by a pair of reinforcing frames in addition to the multiple shafts, the bending rigidity of the injection table is improved. Due to the high rigidity, the bending of the injection table is suppressed.

[0050] Furthermore, since the injection device moving mechanism is arranged along the reinforcing frame, there is no concern that the injection device moving mechanism may protrude from the injection device.

[0051] Therefore, according to the present invention, it is possible to provide an injection device in which bending of the injection table is suppressed and the overall length is small.

[0052] In the invention according to claim 8, the front and rear parts of the hydraulic cylinder are fixed to the reinforcement frame. Since the hydraulic cylinder plays a role in reinforcing the reinforcement frame, the bending rigidity of the reinforcement frame becomes high.

[0053] In the invention according to claim 9, the reinforcement frame of claim 7 is also used as the injection device moving mechanism. The reinforcement frame can be omitted while obtaining the effect of claim 7.

[0054] Therefore, according to the present invention, there is provided an injection device in which bending of the injection table is suppressed and the overall length is small.

[0055] In the invention related to technical solution 10, the shaft has small-diameter parts at both ends of the shaft main body. By inserting the small-diameter parts into the injection table and the injection drive table, the injection drive table is positioned with respect to the injection table by the shaft main body. Then, when the reinforcement frame (or the injection device moving mechanism that also serves as the reinforcement frame) is set on the injection table and the injection drive table, the injection drive table can be positioned by the shaft, so the installation of the reinforcement frame (or the injection device moving mechanism that also serves as the reinforcement frame) becomes easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a cross-sectional view of an injection molding device including the injection device of the present invention.

[0057] Figure 2 It is a side view of an injection molding device including the injection device of the present invention.

[0058] Figure 3 yes Figure 2 The 3-way view is a plan view of the injection device.

[0059] Figure 4 yes Figure 3 4 enlarged cross-sectional views of the parts.

[0060] Figure 5 It is a diagram for explaining the movement of the fixing metal fittings.

[0061] Figure 6 is a diagram illustrating the structure of the support platform. Figure 6 (a) Yes Figure 6 (b) A view from the direction of a, Figure 6 (b) is a plan view of the support platform. Figure 6 (c) Yes Figure 6 (b) c-direction view, Figure 6 (d) Yes Figure 6 (b) is a cross-sectional view along the d-d line.

[0062] Figure 7 This is a diagram for explaining the installation procedure of the reinforcement frame.

[0063] Figure 8 It is a plan view of an injection device according to a modified example.

[0064] Fig. 9 It is a plan view of an injection device according to still another modified example.

[0065] Fig.10 is a diagram illustrating the basic structure of the prior art. Fig.10 (a) is a diagram illustrating a conventional injection device. Fig.10 (b) is a diagram illustrating an improved conventional injection device. DETAILED DESCRIPTION

[0066] The following describes the embodiments of the present invention based on the drawings. In the following description, the extension of the hydraulic cylinder refers to extending the entire length of the hydraulic cylinder, and the contraction refers to shortening the entire length of the hydraulic cylinder.

[0067] [Example]

[0068] like Figure 1 As shown, the injection molding device 10 includes a mold clamping device 20 and an injection device 30 as main elements.

[0069] The mold clamping device 20 is a device for clamping a metal mold composed of a fixed mold 21 and a movable mold 22 .

[0070] The mold clamping device 20 includes a base 23 , a fixed platen 24 and a mold clamping mechanism 25 fixed to the base 23 , tie bars 26 spanning the fixed platen 24 and the mold clamping mechanism 25 , and a movable platen 27 guided by the tie bars 26 .

[0071] The fixed mold 21 is mounted on the fixed platen 24 , the movable mold 22 is mounted on the movable platen 27 , and the molds are clamped by the mold clamping mechanism 25 .

[0072] The mold clamping mechanism 25 may be any of a hydraulic cylinder, a toggle mechanism, and an electric cylinder.

[0073] Corresponding to such a mold clamping device 20, an injection device 30 is provided.

[0074] The injection device 30 includes a heating tube 31, a screw 32 rotatably and axially movably accommodated in the heating tube 31, a drop port block 35 supporting the heating tube 31, an injection platform 36 supporting the drop port block 35, and a nozzle 37 provided at the front end of the heating tube 31 and injecting resin material.

[0075] The drop port block 35 has a material drop port 34 provided at the base of the heating cylinder 31 and guiding the resin material dropped from the hopper 33 into the heating cylinder 31 .

[0076] like Figure 2 As shown, the injection device 30 is placed on a table 41 , and approaches the mold clamping device 20 by contracting the injection device moving mechanism 42 , and moves away from the mold clamping device 20 by extending the injection device moving mechanism 42 .

[0077] like Figure 3 As shown in the figure, a pair of support platforms 70 are installed on the side of the drop port block 35 having the material drop port 34. The support platform 70 extends in a direction perpendicular to the central axis (hereinafter referred to as the long axis) 31a in the longitudinal direction of the heating cylinder 31. At the front end of such a support platform 70, a hydraulic cylinder 43 as a main part of the injection device moving mechanism 42 is installed.

[0078] That is, the pair of injection device moving mechanisms 42 are parallel to the long axis 31a and are arranged at a position away from the long axis 31a by a predetermined distance. It is preferable that the injection device moving mechanism 42 on one side and the injection device moving mechanism 42 on the other side are arranged symmetrically with respect to the long axis 31a by making the two predetermined distances the same. In addition, if necessary due to the arrangement conditions, a difference may be given to one side and the other side in the pair of predetermined distances.

[0079] A relay shaft 45 is threadedly coupled to the piston rod 44 of the hydraulic cylinder 43 , and a flanged metal part 46 is threadedly coupled to the front end of the relay shaft 45 . The flanged metal part 46 is connected (attached) to the fixed plate 24 via a fixing metal part 47 and bolts 48 .

[0080] That is, the injection device moving mechanism 42 is composed of a hydraulic cylinder 43 installed on a support platform 70, a relay shaft 45 connected to a piston rod 44 of the hydraulic cylinder 43 and extending toward the fixed disk 24 side, a flanged metal part 46 connected to the front end of the relay shaft 45, and a fixed metal part 47 that detachably fixes the flanged metal part 46 to the fixed disk 24.

[0081] The injection stage 36 supporting the drop port block 35 also extends in a direction perpendicular to the long axis 31a of the heating cylinder 31. However, the injection stage 36 and the support stage 70 are separated from each other and are not connected.

[0082] Such an injection table 36 includes a plurality of (in this example, four in the up, down, left, and right) shafts 51 extending in a direction away from the heating tube 31, an injection drive table 52 arranged at the front ends of these shafts 51 and parallel to the injection table 36, a screw support plate 53 guided by the shafts 51 and supporting the screw 32 rotatably, a pair of screw shafts 54 that pass through the screw support plate 53 and are mounted on the injection drive table 52 and the injection table 36, and a nut 55 mounted on the screw support plate 53 and screwed into the screw shaft 54.

[0083] The screw shaft 54 ​​is preferably a ball screw having a small friction loss. In this case, the nut 55 is a ball nut.

[0084] A bearing 56 is fitted on the injection stage 36, and one end of the screw shaft 54 ​​is inserted into the bearing 56. A bearing 57 is fitted on the injection drive stage 52, and the other end of the screw shaft 54 ​​is inserted into the bearing 27. A pulley 58 is fixed to the other end of the screw shaft 54.

[0085] If the motor is moved forward and backward by the lead screw ( Figure 1 , No. 59) and with ( Figure 1 , reference numeral 61) rotates the pulley 58, and the screw shaft 54 ​​rotates. Since the nut 55 does not rotate, it moves in the axial direction. If the screw shaft 54 ​​is rotated, the screw support plate 53 moves forward or backward. By moving the screw support plate 53, the screw ( Figure 1 , label 32) moves forward or backward relative to the heating tube 31.

[0086] also, Figure 1 The lead screw 32 shown is provided with a pulley 63 which is rotated by a lead screw rotation motor 64 and a belt 65 .

[0087] like Figure 4 As shown, the flanged metal member 46 is composed of a flange 46a, a neck 46b extending from the flange 46a, and a threaded portion 46c extending from the neck 46b.

[0088] The relay shaft 45 has a female thread portion 45a at the end. The relay shaft 45 is preferably a hollow shaft. A hollow shaft is lighter than a solid shaft.

[0089] The fixing member 47 is a cup having a recessed portion 47a for accommodating the flange 46a, bolt holes 47b provided in a portion surrounding the recessed portion 47a, and a through hole 47c connected to the recessed portion 47a. The cup is heavy because of its thick wall.

[0090] exist Figure 1 In order to facilitate inspection, the injection device 30 may be rotated horizontally after being moved back. Figure 2 The relay shaft 45 shown is an obstacle.

[0091] So, if Figure 5 As shown, the bolts 48 are removed and the fixing member 47 is removed (separated) from the fixing plate 24. In this way, the injection device 30 can be horizontally rotated. However, the fixing member 47 is heavy, and the deflection of the relay shaft 45 becomes large.

[0092] As a countermeasure, in the present invention, the fixing metal part 47 is moved along the relay shaft 45 as shown by arrows (1), (2), and (3), and the heavier fixing metal part 47 is temporarily received (temporarily supported) on the support platform 70 using appropriate accessories 66.

[0093] To this end, Figure 4 The through hole 47c is formed to have a smaller diameter than the outer diameter of the flange 46a and a larger diameter than the outer diameters of the neck 46b and the intermediate shaft 45. In this way, the movements indicated by arrows (1), (2), and (3) can be performed.

[0094] In addition, the attachment 66 is preferably an angle steel or a light angle steel, but the form is arbitrary. In addition, by not using the attachment 66, the fixing metal fitting 47 can also be temporarily fixed directly on the support platform 70.

[0095] based on Figure 6 , the structure of the support platform 70 will be described in detail.

[0096] like Figure 6 As shown in (a), the support platform 70 has a Figure 5 , a seat 71 on which is labeled 35), an upper wall 72 and a lower wall 73 extending from the seat 71, and a reinforced middle wall 74 and a front wall 75 arranged between the lower wall 73 and the upper wall 72.

[0097] like Figure 6 As shown in (b), the support platform 70 further includes a rear wall 76.

[0098] like Figure 6 As shown in (c), the upper wall 72 and the lower wall 73 protrude from the rear wall 76. In the protruding portion, the upper wall 72 and the lower wall 73 are formed with a screw-in portion for screwing in the hydraulic cylinder ( Figure 5 , label 43) is fixed with a female threaded portion 77 of the bolt.

[0099] like Figure 6As shown in (d), the support platform 70 is a square tube-shaped object having an upper wall 72 and a lower wall 73, a front wall 75 connecting the front ends of these walls 72 and 73, a rear wall 76 connecting the rear ends of the walls 72 and 73, and a reinforced middle wall 74 parallel to the upper wall 72 and the lower wall 73 and connecting the front wall 75 and the rear wall 76, and is a casting (including a cast steel product).

[0100] In the figure, F1 and F2 are external forces. Since the support platform 70 is reinforced by the reinforced middle wall 74, it has good rigidity against the external forces F1 and F2. That is, by reinforcing the middle wall 74, the rigidity in the direction of the external force can be increased.

[0101] In addition, since it is a square tube-shaped object, it can be lighter than a solid object.

[0102] In addition, the support stand 70 may be a welded structure formed by welding steel plates to each other, other than a cast product.

[0103] Furthermore, if the required durability can be obtained by the upper wall 72 and the lower wall 73, the reinforcing middle wall 74 can be omitted. However, by providing the reinforcing middle wall 74, the upper wall 72 and the lower wall 73 can be made thinner. Therefore, whether to provide the reinforcing middle wall 74 is optional.

[0104] Next, the operation of the injection device 30 having the above-described structure will be described.

[0105] exist Figure 3 In FIG. 4 , a predetermined nozzle contact force is generated by contracting the hydraulic cylinder 43. The support table 70 is bent as shown by line B by the reaction force of the nozzle contact. In addition, line B is exaggeratedly shown.

[0106] According to the present invention, there is a gap 78 between the support table 70 and the injection table 36. Even if the size of the gap 78 changes, the injection table 36 will not be deformed.

[0107] Assume that there is no support table 70 and the hydraulic cylinder 43 is installed on the injection table 36. Then, the injection table 36 is deformed. If the injection table 36 is deformed, an excessive force acts on the bearing 56 and the ball screw 54, which has an adverse effect on the life of the bearing 56 and the ball screw 54.

[0108] In this regard, in the present invention, the injection stage 36 is not deformed by providing the support stage 70. Since the injection stage 36 is not deformed, the life of the bearing 56 and the ball screw 54 is prolonged.

[0109] In addition, the front part (front end) of the hydraulic cylinder 43 is fixed to the support platform 70, and the rest is not fixed (free). When a bending force acts on the piston rod 44, the hydraulic cylinder 43 tilts, and the influence of the bending is alleviated. This relaxation prolongs the life of the hydraulic cylinder 43.

[0110] Next, based on Figure 7 and Figure 8 Modifications of the present invention will be described.

[0111] like Figure 7 As shown, the shaft 51 is composed of a shaft main body 51a and small diameter parts 51b provided at both ends of the shaft main body 51a. The small diameter part 51b is smaller than the shaft main body 51a. In addition, the length of the shaft main body 51a is precisely finished.

[0112] One of the two small diameter portions 51b is inserted into the injection stage 36, and the other small diameter portion 51b is inserted into the injection drive stage 52, and nuts 79 are screwed into the front ends of the small diameter portions 51b. The injection stage 36 and the injection drive stage 52 are positioned by the step portion at the boundary between the shaft body portion 51a and the small diameter portion 51b.

[0113] That is, the position of the injection drive table 52 with respect to the injection table 36 is accurately determined by the stepped shaft 51 .

[0114] Next, the reinforcing frame 81 is fixed to the injection table 36 and the injection drive table 52 whose positions are determined by bolts 82. Since the injection drive table 52 is positioned relative to the injection table 36 by the shaft 51, the reinforcing frame 81 only needs to be installed, and the installation operation is relatively easy. Figure 3 , and detailed description is omitted.

[0115] In addition, the reinforcing frame 81 can be made into a groove cross-section or a T-section in addition to the I-section, so the shape is arbitrary.

[0116] Since two flanges extend from both ends of a web, the groove section has a larger section modulus and higher rigidity than the I section. In addition, since a flange extends from the center of a web, the T section has a larger section modulus and higher rigidity than the I section. In the case of the groove section or the T section, the web is provided on the side of the screw support plate 53, and the flange is extended outward to avoid interference with the screw support plate 53.

[0117] like Figure 8 As shown, on the reinforcing frame 81, a hydraulic cylinder 43 serving as the injection device moving mechanism 42 is mounted.

[0118] The injection table 36 and the injection drive table 52 are connected by a reinforcing frame 81 in addition to the shaft 51, forming a strong frame structure having an overall quadrilateral shape.

[0119] When the reaction force of the nozzle contact acts on the injection stage 36, the end of the injection stage 36 is supported by the shaft 51, the reinforcing frame 81 and the injection drive stage 52, so the end of the injection stage 36 does not displace. Even if it displaces, it is only slightly.

[0120] As a result, deformation that may affect the bearing 56 does not occur in the injection stage 36 .

[0121] In this example, the front and rear portions of the hydraulic cylinder 43 are fixed to the reinforcement frame 81 , but only the front portion of the hydraulic cylinder 43 may be fixed to the reinforcement frame 81 , or only the center portion may be fixed to the reinforcement frame 81 .

[0122] However, if the front and rear parts of the hydraulic cylinder 43 are fixed to the reinforcing frame 81, the hydraulic cylinder 43 plays a role in reinforcing the reinforcing frame 81, and the bending rigidity of the reinforcing frame 81 is further increased. Therefore, it is recommended to fix the front and rear parts of the hydraulic cylinder 43 to the reinforcing frame 81.

[0123] Next, based on Fig. 9 Still another modification example will be described.

[0124] like Fig. 9 As shown, a hydraulic cylinder 43 serving as an injection device moving mechanism 42 is fixed by bolts 82 to the injection table 36 and the injection drive table 52 positioned by the shaft 51 .

[0125] The hydraulic cylinder 43 has a thick-walled steel pipe as a main component to apply high pressure.

[0126] The injection table 36 and the injection drive table 52 are connected by a strong injection device moving mechanism 42 (hydraulic cylinder 43) in addition to the shaft 51, forming a strong frame structure with a square shape as a whole. As a result, the deformation of the injection table 36 is suppressed, and deformation that affects the bearing 56 does not occur.

[0127] In addition, Figure 3 In addition to fixing the heating cylinder 31 to the drop port block 35 with bolts, the drop port block 35 and the heating cylinder 31 may be integrated, or the drop port block 35 and the injection stage 36 may be integrated.

[0128] Furthermore, the hydraulic cylinder 43 as the main element of the injection device moving mechanism 42 may be a rack and pinion mechanism using an electric cylinder, a pneumatic cylinder or an electric motor as a driving source.

[0129] Industrial Applicability

[0130] The present invention is suitable for an injection device arranged corresponding to a mold clamping device.

[0131] Description of symbols

[0132] 20…Mold clamping device; 21…Fixed mold; 24…Fixed plate; 30…Injection device; 31…Heating cylinder; 31a…Long shaft; 32…Screw; 34…Material drop port; 35…Drop port block; 36…Injection table; 37…Nozzle; 42…Injection device moving mechanism; 43…Hydraulic cylinder; 44…Piston rod; 45…Relay shaft; 46…Metal part with flange; 46a…Flange; 47…Fixed metal part; 47c…Through hole; 51…Shaft rod; 51a…Shaft rod body; 51b…Small diameter part; 52…Injection drive table; 70…Support table; 71…Seat; 72…Upper wall; 73…Lower wall; 74…Reinforced middle wall; 75…Front wall; 76…Rear wall; 81…Reinforcement frame.

Claims

1. An injection device, arranged corresponding to a mold clamping device, characterized in that: The mold clamping device has a fixed plate, on which a fixed mold is mounted. The injection device comprises a heating tube, a lead screw rotatably and axially movablely accommodated in the heating tube, a drop port block supporting the heating tube, an injection table supporting the drop port block and extending in a manner perpendicular to the long axis of the heating tube, a nozzle provided at the front end of the heating tube and injecting a resin material, and a pair of injection device moving mechanisms for moving the heating tube so that the nozzle contacts the fixed mold. The drop port block has a material drop port disposed on the base of the heating tube and guiding the dropped resin material into the heating tube. The drop port block is provided with a support platform extending in a direction perpendicular to the long axis. The injection device moving mechanism is mounted on the support platform and the fixed plate. A gap is provided between the support platform and the injection platform.

2. The injection device according to claim 1, characterized in that The support platform is a square tube-shaped object. The square tube-shaped object is composed of a seat abutting against the drop port block, an upper wall, a lower wall, a front wall and a rear wall extending from the seat in a direction perpendicular to the long axis.

3. The injection device according to claim 2, characterized in that The support platform further includes a reinforcing middle wall which is parallel to the upper wall and connects the front wall and the rear wall.

4. The injection device according to claim 1, characterized in that The injection device moving mechanism is composed of a hydraulic cylinder installed on the support platform, a relay shaft connected to the piston rod of the hydraulic cylinder and extending toward the fixed disk, a flanged metal part connected to the front end of the relay shaft and having a flange with an outer diameter larger than the outer diameter of the relay shaft, and a fixing metal part that detachably fixes the flanged metal part relative to the fixed disk.

5. The injection device according to claim 4, characterized in that The front portion of the hydraulic cylinder is fixed to the support platform, and the remaining portion is not fixed.

6. The injection device according to claim 4 or 5, characterized in that The fixing member has a through hole having a diameter larger than the outer diameter of the relay shaft and smaller than the outer diameter of the flange. The relay shaft can be moved to the vicinity of the support stand using the relay shaft as a guide.

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