Injection molding machine

Abstract

Provided is an injection molding machine capable of improving the tilt-prevention effect of a fixed platen based on a link member. An injection molding machine (1) according to one embodiment includes a link member (18) that links a nozzle contact mechanism (16) and a fixed platen (20). The link member (18) has a wrist portion (64) that rises upward from the fixed platen (20) side of a support base portion (62), and a platen linking portion (80) as a second linking portion that links the upper portion of the wrist portion (64) and the fixed platen (20). The platen linking portion (80) is fixed to the wrist portion (64) and has a linking pin (84) that extends in the left-right direction (D3) that coincides with the width direction of the machine table (10), and a rotating member (86) that is fixed to the fixed platen (20) and is rotatable about the linking pin (84) as a center, the linking pin (84) being disposed so as to include a plane (F1) that passes through the center axis of the nozzle (46) and is parallel to the mounting surface (10F) of the machine table (10).

Description

TECHNICAL FIELD

[0001] The present application relates to an injection molding machine that injects a molten material into the inside of a mold. BACKGROUND

[0002] In Japanese Patent Application Publication No. 2019-025701, an injection molding machine is disclosed that links a fixed platen and a nozzle contact mechanism with a link member having a wrist portion that extends upward from a support table portion supported on a machine table. In this injection molding machine, when the nozzle of an injection unit is pressed against a mold by the nozzle contact mechanism, a force that stretches the link member (a nozzle contact force) is generated on the link member as a reaction force to this pressing force.

[0003] In the link member of Japanese Patent Application Publication No. 2019-025701, the linking portion (second linking portion) that links the fixed platen is provided so as to be rotatable in a direction along the moving direction of the injection unit. Therefore, the moment that is generated by the tilting of the link member toward the fixed platen side due to the generation of the nozzle contact force is converted into the rotation of the linking portion (second linking portion). Therefore, in Japanese Patent Application Publication No. 2019-025701, the moment in the direction in which the fixed platen tilts is not easily generated, and the tilting prevention effect of the fixed platen based on the link member can be obtained. SUMMARY

[0004] However, if the fixed platen tilts slightly, it is possible that an adverse situation will occur in the clamping of the mold or the like, and thus a good molded product cannot be obtained. Therefore, it is required to improve the tilting prevention effect of the fixed platen based on the link member.

[0005] Here, an object of the present application is to provide an injection molding machine that can improve the tilting prevention effect of the fixed platen based on the link member.

[0006] A mode of the present application is an injection molding machine that includes:

[0007] an injection unit that has a nozzle that injects a molten material into the inside of a mold fixed on a fixed platen and a movable platen;

[0008] a machine table that mounts the injection unit;

[0009] a nozzle contact mechanism that pushes the nozzle against the mold by moving the injection unit relative to the machine table in a first direction that approaches the mold; and

[0010] a link member that is slidable relative to the machine table in the first direction and a second direction opposite to the first direction, and links the nozzle contact mechanism and the fixed platen,

[0011] The link member has a support base portion slidably mounted with respect to the machine table and a wrist portion rising upward from the fixed platen side of the support base portion, the link member has a first link portion linked with the nozzle contact mechanism on the support base portion, and has a second link portion linked with the fixed platen on an upper portion of the wrist portion,

[0012] The second link portion of the link member is fixed on the wrist portion and has a link pin extending in a width direction of the machine table parallel to a mounting surface of the machine table and orthogonal to the first direction, and a rotation member fixed on the fixed platen and rotatable about the link pin as a center,

[0013] The link pin is disposed in a manner of including a plane passing through a center axis of the nozzle and parallel to the mounting surface of the machine table.

[0014] According to the aspect of the present application, compared to a case where the link pin is disposed in a manner of not including a plane passing through a center axis of the nozzle and parallel to the mounting surface of the machine table, inclination of the link member can be suppressed. In addition, even if the link member is inclined toward the fixed platen, a moment generated by the inclination can be converted into rotation of the second link portion. As a result, improvement of the tilt prevention effect of the fixed platen based on the link member can be sought. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic view showing a configuration of an injection molding machine.

[0016] Figure 2 is a schematic view showing a part of the injection molding machine in an injection state.

[0017] Figure 3 is a perspective view showing a link member.

[0018] Figure 4 is a schematic view showing a relationship between the link member and a nozzle of an injection unit.

[0019] Figure 5 is a schematic view showing a situation of force generation of a comparative example.

[0020] Figure 6 is a schematic view showing a situation of force generation of the present embodiment.

[0021] Figure 7 is a front view of a platen link portion viewed from an injection unit side.

[0022] Figure 8 is a schematic view showing a platen link portion of a modification example 1.

[0023] Figure 9 is a schematic view showing a platen link portion of a modification example 2. Figure 3The same view shows a schematic view of the injection molding machine of Modification 2.

[0024] Figure 10A is a view of one of the fixed platen support portions as viewed from the side of the front surface of one of the left and right directions of the fixed platen, Figure 10B is a view of the fixed platen support portion as viewed from the front surface of the injection unit side. DETAILED DESCRIPTION

[0025] [Embodiment]

[0026] [Configuration of Injection Molding Machine]

[0027] Figure 1 is a schematic view showing the configuration of the injection molding machine 1, Figure 2 is a schematic view showing a part of the injection molding machine 1 in an injection state. In the present embodiment, D1 in the drawing is the front and back direction, D2 in the drawing is the up and down direction, and D3 in the drawing is the left and right direction. In addition, the front and back direction D1, the up and down direction D2, and the left and right direction D3 are in a relationship of being orthogonal to each other. In addition, in the present embodiment, D11 in the drawing is the front direction, D12 in the drawing is the back direction, D21 in the drawing is the up direction, and D22 in the drawing is the down direction. In addition, the down direction D22 can be the direction of the action of gravity, or can be a direction different from the direction of the action of gravity.

[0028] The injection molding machine 1 is provided with a machine table 10, a clamping unit 12, an injection unit 14, a nozzle contact mechanism 16, and a connecting member 18.

[0029] The machine table 10 is a table for mounting the clamping unit 12, the injection unit 14, the nozzle contact mechanism 16, and the connecting member 18, and has a mounting surface 10F. The mounting surface 10F on which the clamping unit 12 is mounted and the mounting surface 10F on which the injection unit 14, the nozzle contact mechanism 16, and the connecting member 18 are mounted can be on the same surface, or can be staggered in the up and down direction D2. In the present embodiment, a case in which the mounting surface 10F on which the clamping unit 12 is mounted and the mounting surface 10F on which the injection unit 14, the nozzle contact mechanism 16, and the connecting member 18 are mounted are staggered in the up and down direction D2 is exemplified.

[0030] In the machine table 10, a first machine table for mounting the clamping unit 12 and a second machine table for mounting the injection unit 14, the nozzle contact mechanism 16, and the connecting member 18 can be detachably connected. In the case in which the first machine table and the second machine table are detachably connected, for example, the connected first machine table and the second machine table can be separated at the time of maintenance. Thus, the clamping unit 12, the injection unit 14, and the like are easily accessible, and maintenance of the clamping unit 12 or the injection unit 14 and the like can be performed individually.

[0031] The mold clamping unit 12 has a fixed platen 20, a rear platen 22, a movable platen 24, a mold 26, a plurality of links 28, and a platen drive mechanism 29.

[0032] The fixed platen 20 and the rear platen 22 are provided at a spacing from each other on a mounting surface 10F of a bed 10 of the injection molding machine 1. A nozzle insertion hole 20H is formed in the fixed platen 20. The movable platen 24 is disposed between the fixed platen 20 and the rear platen 22. The mold 26 is composed of a fixed mold 26A and a movable mold 26B. The fixed mold 26A is attached to the movable platen 24 side of the fixed platen 20, and the movable mold 26B is attached to the fixed platen 20 side of the movable platen 24. The plurality of links 28 are each a rod-like member, one of the both ends of the link 28 is fixed to the fixed platen 20, and the other of the both ends of the link 28 is fixed to the rear platen 22. The movable platen 24 is passed through the plurality of links 28, and the movable platen 24 is movable along the links 28.

[0033] The platen drive mechanism 29 moves the movable platen 24 in a platen approach direction (rear direction D12) in which the movable platen 24 approaches the fixed platen 20, and closes the mold 26. On the other hand, the platen drive mechanism 29 moves the movable platen 24 in a platen separation direction (front direction D11) in which the movable platen 24 separates from the fixed platen 20, and opens the mold 26. In addition, in a state in which the mold 26 is clamped, the movable mold 26B is in contact with the fixed mold 26A, and in a state in which the mold 26 is opened, the movable mold 26B is out of contact with the fixed mold 26A.

[0034] The injection unit 14 has a base portion 40, an injection unit body 42, a cylinder portion 44, and a nozzle 46.

[0035] The base portion 40 is a base part of the injection unit 14, and is slidably attached to a plurality of guide rails 50 provided on the mounting surface 10F of the bed 10. The plurality of guide rails 50 are spaced apart at a certain interval in the left-right direction D3, and extend in parallel in the front-rear direction D1. The injection unit body 42 is placed on the base portion 40, and is rotatably coupled to the base portion 40 with a rotation pin 48 as a rotation center. The cylinder portion 44 is fixed to the injection unit body 42, and extends along the guide rails 50 from a surface of the injection unit body 42 on the fixed platen 20 side toward the mold clamping unit 12. The nozzle 46 is for injecting a molten material, and extends along the guide rails 50 from a front end of the cylinder portion 44 toward the mold clamping unit 12.

[0036] The injection unit 14 is movable in a first direction (front direction D11) in which the injection unit 14 approaches the mold 26, and a second direction (rear direction D12) in which the injection unit 14 separates from the mold 26, along the plurality of guide rails 50. The injection unit 14 is moved in the front direction D11 or the rear direction D12 by the nozzle contact mechanism 16.

[0037] The nozzle contact mechanism 16 has a motor 52, a ball screw shaft 54, and a ball screw nut 56.

[0038] The motor 52 is a motor for moving the injection unit 14 in the forward direction D11 or the rearward direction D12. The ball screw shaft 54 extends in the forward and rearward direction D1. The end portion of the rearward side of the ball screw shaft 54 is coupled to the rotor shaft of the motor 52 via a coupling 58, and the end portion of the forward side of the ball screw shaft 54 is coupled to the link member 18. The ball screw nut 56 is screwed to the ball screw shaft 54, and is coupled to the base portion 40 of the injection unit main body 42 in a manner that it cannot rotate with respect to the base portion 40 via a spring 60. Note that the spring 60 can also be omitted.

[0039] The nozzle contact mechanism 16 drives the motor 52 in the reverse rotation direction (or the forward rotation direction) when moving the injection unit 14 in the rearward direction D12 with respect to the table 10. When the motor 52 is driven in the reverse rotation direction (or the forward rotation direction), the ball screw shaft 54 coupled to the rotor shaft of the motor 52 rotates, and the ball screw nut 56 screwed to this ball screw shaft 54 moves in the rearward direction D12. Thus, the injection unit 14 moves in the rearward direction D12.

[0040] On the other hand, the nozzle contact mechanism 16 drives the motor 52 in the forward rotation direction (or the reverse rotation direction) when moving the injection unit 14 in the forward direction D11 with respect to the table 10. When the motor 52 is driven in the forward rotation direction (or the reverse rotation direction), the ball screw shaft 54 coupled to the rotor shaft of the motor 52 rotates, and the ball screw nut 56 screwed to this ball screw shaft 54 moves in the forward direction D11. Thus, the injection unit 14 moves in the forward direction D11. In correspondence with the movement of the injection unit 14 in the forward direction D11, the nozzle 46 of this injection unit 14 is inserted into the nozzle insertion hole 20H of the fixed platen 20, and comes into contact with the nozzle contact portion (valve stem) of the mold 26 through this nozzle insertion hole 20H (refer to FIG. 2). Figure 2 ).

[0041] The nozzle contact mechanism 16 presses the nozzle 46 of the injection unit 14 against the mold 26 by moving the injection unit 14 in the forward direction D11 relative to the machine table 10 in the case of injecting molten material into the mold 26. That is, the nozzle contact mechanism 16 also moves the ball screw nut 56 in the forward direction D11 by driving the motor 52 in the positive rotation direction (or the reverse rotation direction) after the nozzle 46 comes into contact with the nozzle contact portion (valve pin) of the mold 26. Thus, the spring 60 is compressed, and the injection unit 14 becomes in the nozzle contact state in which the nozzle 46 is pressed against the valve pin of the mold 26 due to the reaction force of the compression of the spring 60. In addition, in the case where the spring 60 is omitted, the injection unit 14 becomes in the nozzle contact state by continuously driving the motor 52 in the positive rotation direction (or the reverse rotation direction). Incidentally, in the case where the spring 60 is provided, the nozzle contact state can be maintained even when the motor 52 is stopped in the state where the spring 60 is compressed. The injection unit 14 injects molten material of resin or metal into the inside of the mold 26 in the nozzle contact state.

[0042] The link member 18 links the fixed pressure plate 20 and the nozzle contact mechanism 16. Figure 3 is a perspective view showing the link member 18. The link member 18 has a support table portion 62 and a pair of wrist portions 64, and is formed in a substantially L shape in side view.

[0043] The support table portion 62 is slidable in the forward direction D11 or the rear direction D12 relative to the machine table 10, and is supported on the machine table 10 via a direct drive mechanism 70. The direct drive mechanism 70 is for sliding the support table portion 62 in the forward direction D11 or the rear direction D12 relative to the machine table 10, and has a plurality of support rails 72 and a plurality of guide blocks 74.

[0044] The plurality of support rails 72 each extend in the front-rear direction D1. The number of the support rails 72 can be two as exemplified in Figure 3 , or can be three or more. The plurality of support rails 72 are arranged at a certain interval in the left-right direction D3. In addition, the left-right direction D3 coincides with the width direction of the machine table 10. The width direction of the machine table 10 is in a relationship orthogonal to the mounting surface 10F of the machine table 10 and to the first direction (the forward direction D11) in which the injection unit 14 approaches the mold 26.

[0045] The plurality of guide blocks 74 are each freely slidable relative to the support rails 72. One or more guide blocks 74 are provided relative to one support rail 72. In the case where the number of the guide blocks 74 provided relative to one support rail 72 is two or more, the guide blocks 74 are arranged at an interval in the front-rear direction D1. In addition, in the example of Figure 3 , two guide blocks 74 are provided relative to one support rail 72.

[0046] The support platform portion 62 can also have a pair of protruding leg portions 62A protruding from both ends in the left-right direction D3 toward the injection unit 14 side (the rear direction D12 side). Each protruding leg portion 62A is disposed directly above the support rail 72 and protrudes from the support platform portion 62 along the support rail 72. A bearing portion 66 is provided on the end surface of the support platform portion 62 on the injection unit 14 side (the rear direction D12 side) between the pair of protruding leg portions 62A. The other end of the ball screw shaft 54 of the nozzle contact mechanism 16 is attached to the bearing portion 66. That is, the bearing portion 66 is a portion that is linked to the nozzle contact mechanism 16, and in the present embodiment, a case in which the pair of protruding leg portions 62A are more recessed toward the fixed platen 20 side is exemplified.

[0047] The pair of wrist portions 64 stand upward (the upward direction D21) from the fixed platen 20 side (the front direction D11 side) of the support platform portion 62 at intervals in the left-right direction D3. In the case of the present embodiment, the pair of wrist portions 64 respectively stand upward (the upward direction D21) from the support platform portion 62 along the surface of the fixed platen 20 on the injection unit 14 side (the rear direction D12 side). The pair of wrist portions 64 each have a platen linking portion 80 linked to the fixed platen 20 on the upper portion of the wrist portion 64 that stands from the support platform portion 62.

[0048] Each platen linking portion 80 is provided in a manner that is left-right symmetrical with respect to the nozzle 46. Since each platen linking portion 80 is configured identically, the configuration of one platen linking portion 80 will be described below.

[0049] The platen linking portion 80 is linked to the fixed platen 20 in a state in which it is rotatable with respect to the fixed platen 20. The platen linking portion 80 has a cutout portion 82, a linking pin 84, and a rotation member 86.

[0050] The cutout portion 82 is a portion that is cut out on the upper portion of the wrist portion 64. The cutout portion 82 is located approximately midway between both ends in the width direction (the left-right direction D3) of the wrist portion 64 and extends in the front-rear direction D1 from the end surface on the fixed platen 20 side (the front direction D11 side) to the end surface on the injection unit 14 side (the rear direction D12 side).

[0051] The linking pin 84 is disposed in the cutout portion 82 and extends in the left-right direction D3. The linking pin 84 is fixed to the wrist portion 64 in the left-right direction D3 of the cutout portion 82. That is, the linking pin 84 is in a state in which it is not rotatable with respect to the wrist portion 64 and is not slidable in any of the front-rear direction D1, the upward-downward direction D2, and the left-right direction D3 with respect to the wrist portion 64.

[0052] The linking pin 84 disposed in the cutout portion 82 is inserted through the rotation member 86. The rotation member 86 is fixed to the fixed platen 20 in a state in which it is rotatable about the linking pin 84.

[0053] Figure 4 is a schematic view showing the relationship between the link member 18 and the nozzle 46 of the injection unit 14. The link pin 84 of the link member 18 is located at substantially the same height as the nozzle 46 of the injection unit 14. That is, the link pin 84 is disposed in such a manner as to include a plane F1 that passes through the central axis of the nozzle 46 and is parallel to the mounting surface 10F of the machine table 10. Preferably, the pin axis AX of the link pin 84 is located on the plane F1. Since the link pin 84 is disposed in such a manner as to include the above-described plane F1, a rotation member 86 that is rotatable about the link pin 84 is also disposed in such a manner as to include the above-described plane F1. In addition, the height of the link pin 84 is the height from the mounting surface 10F of the machine table 10 (the length in the upward direction D21 from the mounting surface 10F). The central axis of the nozzle 46 is a line that passes through the radial center of the nozzle 46 in the direction in which the nozzle 46 extends.

[0054] Figure 5 is a schematic view showing the state of force generation in the comparative example. The present comparative example envisages the above-described Japanese Patent Application Publication No. 2019-025701. In the present comparative example, a link member 18EX is provided instead of the link member 18 of the present embodiment. The link member 18EX has a platen link portion 80EX that is different from the platen link portion 80 of the present embodiment and a rotation member 86EX that is different from the rotation member 86 of the present embodiment. The platen link portion 80EX is different from the platen link portion 80 of the present embodiment in that the link pin 84EX is disposed on the machine table 10 side (the downward direction D22 side) more than the plane F1 that passes through the central axis of the nozzle 46 and is parallel to the mounting surface 10F of the machine table 10. The rotation member 86EX has a shape that is different from the shape of the rotation member 86 of the present embodiment. In addition, in the present comparative example, the configurations other than the platen link portion 80EX and the rotation member 86EX are the same as in the present embodiment.

[0055] When the nozzle 46 of the injection unit 14 is pressed against the mold 26 by the nozzle contact mechanism 16, a nozzle contact force P2 is generated on the link member 18EX as a reaction force to the pressing force P1. In the link member 18EX, since the support land portion 62 of the platen link portion 80EX is slidable with respect to the machine table 10 in the forward direction D11 or the rearward direction D12, the nozzle contact force P2 is mainly generated on the link pin 84EX of the link member 18EX.

[0056] In the case of the present comparative example, the link pin 84EX is disposed on the machine table 10 side (the downward direction D22 side) more than the plane F1 that passes through the central axis of the nozzle 46 and is parallel to the mounting surface 10F of the machine table 10. Therefore, the lines of action of the pressing force P1 and the nozzle contact force P2, which is the reaction force to the pressing force P1, are not on the same straight line. Therefore, a moment MF is generated in the direction in which the fixed platen 20 tilts.

[0057] Figure 6is a schematic view showing a state of force generation of the present embodiment. In the case of the present embodiment, the link pin 84 is disposed in a manner that includes a plane F1 that passes through the center axis of the nozzle 46 and is parallel to the mounting surface 10F of the table 10. Therefore, the action line of the pressing force P1 and its reaction force, that is, the nozzle contact force P2, are on the same straight line. Therefore, a moment in the direction in which the fixed platen 20 tilts is not substantially generated, and an improvement in the tilt prevention effect of the fixed platen 20 based on the link member 18 can be sought. In addition, in the present embodiment, even if the link member 18 tilts toward the fixed platen 20 side, a moment MF generated due to the tilt can be converted into rotation of the platen link portion 80.

[0058] Figure 7 is a front view of the platen link portion 80 as viewed from the injection unit side 14. The pair of platen link portions 80 are disposed symmetrically with respect to a plane F2 that passes through the center axis of the nozzle 46 and is orthogonal to the mounting surface 10F of the table 10. Thereby, compared to the case where the platen link portion 80 is one, the link between the fixed platen 20 and the link member 18 can be strengthened, and in addition, a deviation of force acting on each platen link portion 80 can be suppressed.

[0059] The rotation member 86 of each platen link portion 80 is fixed to the fixed platen 20 on both the table 10 side (the lower direction D22 side) and the side opposite to the table 10 side (the upper direction D21 side) across the link pin 84 by a plurality of first fastening members 90. Thereby, compared to the case where the rotation member 86 is fixed to the fixed platen 20 on one side and the other side in the left-right direction D3 across the link pin 84, the tilt of the link member 18 toward the fixed platen 20 side can be effectively suppressed.

[0060] The first fastening member 90 is a tool for fixing a fixed object to a fixed object, and as the first fastening member 90, for example, a bolt or the like can be cited. The plurality of first fastening members 90 are disposed symmetrically with respect to the plane F1 that passes through the center axis of the nozzle 46 and is parallel to the mounting surface 10F of the table 10. Thereby, a deviation of force acting on the plurality of first fastening members 90 can be suppressed.

[0061] In addition, in the present embodiment, a pair of pedestal portions 20P are provided on the surface of the fixed platen 20 on the injection unit 14 side, and the rotation member 86 of one platen link portion 80 is fixed to each of the pedestal portions 20P by two first fastening members 90. In addition, the rotation member 86 of each platen link portion 80 has a portion that slightly protrudes more toward the fixed platen 20 than the wrist portion 64. Therefore, in a state where the rotation member 86 is fixed to the pedestal portion 20P, a prescribed gap GP is formed between the fixed platen 20 and the wrist portion 64. Figure 4). That is, the link member 18 and the fixed platen 20 do not interfere with each other except for the rotating member 86 and the platen portion 20P. Therefore, it is possible to suppress the heat of the molten material or the like injected into the mold 26 from being conducted to the link member 18 via the fixed platen 20.

[0062] [Modified Example]

[0063] The above-described embodiment can also be modified as follows.

[0064] (Modified Example 1)

[0065] Figure 8 is a schematic view showing the platen link portion 80 of the modified example 1. Since the pair of platen link portions 80 of the present modified example are configured identically, the configuration of one platen link portion 80 will be described below as with the embodiment.

[0066] In the present modified example, the cutout portion 82( Figure 7 ) provided on the wrist portion 64 is omitted, and the link pin 84 protrudes from both ends in the width direction (the left-right direction D3) of the wrist portion 64. In addition, in the present modified example, the platen link portion 80 is provided with a pair of rotating members 86X, 86Y instead of the rotating member 86 of the embodiment. The pair of rotating members 86X, 86Y can be connected to each other or can not be connected. In the present modified example, a case where the pair of rotating members 86X, 86Y are not connected is exemplified. Figure 8

[0067] The rotating member 86X is fixed to the fixed platen 20 in a state where it can rotate around the link pin 84 protruding from one of both ends in the width direction (the left-right direction D3) of the wrist portion 64. The rotating member 86Y is fixed to the fixed platen 20 in a state where it can rotate around the link pin 84 protruding from the other of both ends in the width direction (the left-right direction D3) of the wrist portion 64.

[0068] In addition, in the present modified example, the rotating member 86X and the rotating member 86Y are fixed by a plurality of first fastening members 90 on both sides of the stage 10 side (the lower direction D22 side) and the side opposite to the stage 10 side (the upper direction D21 side) with the link pin 84 interposed therebetween. As with the embodiment, these first fastening members 90 are symmetrically provided with respect to the face F1 passing through the center axis of the nozzle 46 and parallel to the mounting face 10F of the stage 10. Figure 8

[0069] ​​In this way, the platen connecting portion 80 of the present modification is different in configuration from the platen connecting portion 80 of the embodiment, but is connected to the fixed platen 20 in a state of being able to rotate with respect to the fixed platen 20, like the platen connecting portion 80 of the embodiment. Therefore, like the embodiment, even if the link member 18 is inclined toward the fixed platen 20 side, the moment MF generated by the inclination can be converted into rotation of the platen connecting portion 80.

[0070] In addition, as for the seating portion 20P (refer to Figure 3 ) of the rotary member 86X and the rotary member 86Y, it can be provided on the surface of the fixed platen 20 on the injection unit 14 side, or can be omitted. In addition, the rotary member 86X and the rotary member 86Y can also have a portion that protrudes slightly more toward the fixed platen 20 side than the wrist portion 64, like the embodiment. In the case where the rotary member 86X and the rotary member 86Y have a portion that protrudes more toward the fixed platen 20 side than the wrist portion 64, like the embodiment, a prescribed gap GP Figure 4 ) is formed between the fixed platen 20 and the wrist portion 64. Therefore, like the embodiment, it is possible to suppress the heat of the molten material or the like injected into the mold 26 from being conducted to the link member 18 via the fixed platen 20.

[0071] (Modification 2)

[0072] The number of the platen connecting portion 80 and the wrist portion 64 can be one, or three or more. In addition, from the viewpoint of suppressing deviation of force acting on each platen connecting portion 80, it is preferable that, as shown in Figure 7 , the plurality of platen connecting portions 80 and the wrist portions 64 are symmetrically provided with respect to a surface F2 that passes through the center axis of the nozzle 46 and is orthogonal to the mounting surface 10F of the table 10.

[0073] (Modification 3)

[0074] Figure 9 is a schematic view of the injection molding machine of Modification 2, shown from the same viewpoint as Figure 3 . In the present modification, at least two fixed platen supporting portions 100 that support both sides of the fixed platen 20 in the left-right direction D3 are provided. In Figure 9 , one fixed platen supporting portion 100 that supports the right side (or the left side) of the fixed platen 20 and one fixed platen supporting portion 100 that supports the left side (or the right side) of the fixed platen 20 are shown.

[0075] Each fixed platen supporting portion 100 and the fixed platen 20 are symmetrically provided with respect to a surface F2 that passes through the center axis of the nozzle 46 and is orthogonal to the mounting surface 10F of the table 10 (refer to Figure 7) are symmetrically arranged. Thus, the deviation of the force generated at the contact portion of the fixed platen support portion 100 with the fixed platen 20 can be suppressed, and the fixed platen 20 can be stably supported by each fixed platen support portion 100.

[0076] The fixed platen 20 supported by each fixed platen support portion 100 can also be non-contact with the table 10. In addition, in the Figure 9 fixed platen 20 and the table 10 are non-contact. In the case where the fixed platen 20 and the table 10 are non-contact, the table 10 side (lower direction D22 side) of the fixed platen 20 and the side opposite to the table 10 (upper direction D21 side) are less likely to be asymmetrically deformed than in the case where the fixed platen 20 and the table 10 are in contact. That is, in the case where the fixed platen 20 and the table 10 are non-contact, even if the fixed platen 20 expands due to heat or the like conducted from the mold 26, the case where the fixed platen 20 is asymmetrically deformed in the upper and lower directions D2 can be reduced. Therefore, in the case where the fixed platen 20 and the table 10 are non-contact, the inclination of the fixed platen 20 toward the pouring direction based on the connecting member 18 can be further suppressed than in the case where the fixed platen 20 and the table 10 are in contact.

[0077] Each fixed platen support portion 100 is configured identically. Hereinafter, the configuration of one fixed platen support portion 100 will be described. Figure 10A is a view of one fixed platen support portion 100 as viewed from the side surface side front surface of one side in the left and right directions D3 of the fixed platen 20, Figure 10B is a view of the fixed platen support portion 100 as viewed from the front surface of the injection unit 14 side. The fixed platen support portion 100 has a support body 102 and a protruding portion 104 that protrudes slightly more toward the fixed platen 20 side than the support body 102.

[0078] The fixed platen support portion 100 is fixed to the fixed platen 20 in a state where the protruding portion 104 is in contact with the side surface in the left and right directions D3 of the fixed platen 20. In this state, a prescribed gap GP1 is formed between the fixed platen support portion 100 other than the protruding portion 104 and the fixed platen 20. That is, the fixed platen support portion 100 does not interfere with the fixed platen 20 other than the protruding portion 104. Therefore, in the case where the prescribed gap GP1 is formed between the fixed platen support portion 100 and the fixed platen 20, the inclination of the fixed platen 20 toward the pouring direction based on the connecting member 18 can be further suppressed than in the case where the gap GP1 is not formed.

[0079] The fixed platen support portion 100 is fixed to the fixed platen 20 by a plurality of second fasteners 106. The second fasteners 106 are means for fixing a fixed object to a fixed object, and as the second fasteners 106, for example, a bolt or the like can be cited. In addition, the second fasteners 106 can be the same configuration as the first fasteners 90, or can be a different configuration.

[0080] The plurality of second fasteners 106 are symmetrically disposed with respect to a plane F1 that passes through the central axis of the nozzle 46 and is parallel to the mounting surface 10F of the table 10. In addition, the plurality of second fasteners 106 are symmetrically disposed with respect to a plane F3 that passes through the thickness center of the fixed platen 20 in the front-rear direction D1 and is orthogonal to the mounting surface 10F of the table 10. Thereby, it is possible to suppress the deviation of the force acting on the plurality of second fasteners 106.

[0081] The height H of the fixed platen support portion 100 from the table 10 can also exceed a plane F1 that passes through the central axis of the nozzle 46 and is parallel to the mounting surface 10F of the table 10. In the case where the height H of the fixed platen support portion 100 exceeds the above-mentioned plane F1, compared to the case where the height H does not exceed the above-mentioned plane F1, it is possible to firmly and stably suppress the tilting of the fixed platen 20 based on the connecting member 18.

[0082] (Modified Example 4)

[0083] The above-described embodiments and modified examples can be arbitrarily combined within a range that does not cause contradiction.

[0084] [Invention]

[0085] The invention that can be grasped according to the above-described embodiments and modified examples is described below.

[0086] The present application is an injection molding machine (1) having an injection unit (14), a machine bed (10), a nozzle contact mechanism (16), and a link member (18). The injection unit (14) has a nozzle (46) that injects molten material into the inside of a mold (26) fixed to a fixed platen (20) and a movable platen (24). The machine bed (10) has the injection unit (14) mounted thereon. The nozzle contact mechanism (16) pushes the nozzle (46) against the mold (26) by moving the injection unit (14) relative to the machine bed (10) in a first direction (D11) toward the mold (26). The link member (18) is slidable relative to the machine bed (10) in the first direction (D11) and a second direction (D12) opposite the first direction (D11), and links the nozzle contact mechanism (16) with the fixed platen (20). The link member (18) has a support base portion (62) slidably mounted relative to the machine bed (10) and a wrist portion (64) rising upward from the fixed platen (20) side of the support base portion (62), has a first link portion (66) linked with the nozzle contact mechanism (16) on the support base portion (62), and has a second link portion (80) linked with the fixed platen (20) on an upper portion of the wrist portion (64). The second link portion (80) of the link member (18) is fixed to the wrist portion (64) and has a link pin (84) extending in a width direction (D3) of the machine bed (10) parallel to a mounting surface (10F) of the machine bed (10) and orthogonal to the first direction (D11), and a rotation member (86) fixed to the fixed platen (20) and rotatable about the link pin (84), the link pin (84) being disposed so as to include a plane (F1) passing through a central axis of the nozzle (46) and parallel to the mounting surface (10F) of the machine bed (10).

[0087] Thus, compared to a case where the link pin (84) is disposed so as not to include the plane (F1) passing through the central axis of the nozzle (46) and parallel to the mounting surface (10F) of the machine bed (10), tilting of the link member (18) can be suppressed. In addition, even if the link member (18) tilts toward the fixed platen (20) side, a moment (MF) resulting from the tilting can be converted into rotation of the second link portion (80). As a result, improvement of the tilt-preventing effect of the fixed platen (20) based on the link member (18) can be sought.

[0088] Also, the injection molding machine (1) can further have a direct drive mechanism (70) provided on the machine bed (10) for sliding the support base portion (62) relative to the machine bed (10) in the first direction (D11) or the second direction (D12), the support base portion (62) being supported on the machine bed (10) via the direct drive mechanism (70). Thus, the link member (18) can be easily and stably slid.

[0089] The rotating member 86 can also be fixed to the fixed platen 20 on both the side of the table 10 (the lower direction D22 side) and the side opposite to the side of the table 10 via the link pin 84. Thus, compared to the case where the rotating member 86 is fixed to the fixed platen 20 on both the side and the other side in the width direction D3 of the table 10 via the link pin 84, the inclination of the link member 18 to the fixed platen 20 side can be effectively suppressed.

[0090] The rotating member 86 can also be fixed to the fixed platen 20 via a plurality of first fastening members 90, and the plurality of first fastening members 90 can be symmetrically disposed with respect to a plane F1 passing through the center axis of the nozzle 46 and parallel to the mounting surface 10F of the table 10. Thus, the deviation of the force acting on the plurality of first fastening members 90 can be suppressed.

[0091] The second link portion 80 can also be symmetrically disposed with respect to a plane F2 passing through the center axis of the nozzle 46 and orthogonal to the mounting surface 10F of the table 10. Thus, compared to the case where the second link portion 80 is one, the link between the fixed platen 20 and the link member 18 can be enhanced, and in addition, the deviation of the force acting on each second link portion 80 can be suppressed.

[0092] The link pin 84 can also be fixed in a manner that is not rotatable with respect to the wrist portion 64 and is not slidable in the pin axis AX direction with respect to the wrist portion 64. Thus, the moment MF generated by the inclination of the link member 18 to the fixed platen 20 side can be effectively converted by the rotation of the second link portion 80.

[0093] The injection molding machine 1 can also have at least two fixed platen support portions 100 provided on the table 10 and supporting both sides of the fixed platen 20 in the width direction D3 of the table 10. Thus, compared to the case where the fixed platen support portion 100 is not provided, the inclination of the fixed platen 20 to the tilting direction based on the link member 18 can be further suppressed.

[0094] The height H of each fixed platen support portion 100 from the mounting surface 10F of the table 10 can also exceed the plane F1 passing through the center axis of the nozzle 46 and parallel to the mounting surface 10F of the table 10. Thus, compared to the case where the height H does not exceed, the tilting of the fixed platen 20 based on the link member 18 can be firmly and stably suppressed.

[0095] The fixed platen 20 can also be non-contact with the table 10. Thus, even if the fixed platen 20 expands due to heat or the like conducted from the mold 26, it is possible to reduce the case where the fixed platen 20 is asymmetrically deformed on the table 10 side and the opposite side thereof. Therefore, even if the link member 18 is inclined toward the fixed platen 20 side, it is difficult to generate a moment (MF) in the direction in which the fixed platen 20 is tilted. As a result, it is possible to seek further improvement of the tilt prevention effect of the fixed platen 20 based on the link member 18.

[0096] The fixed platen 20 and each fixed platen support portion 100 can also be symmetrically disposed with respect to a plane (F2) that passes through the central axis of the nozzle 46 and is orthogonal to the mounting surface 10F of the table 10. Thus, it is possible to suppress the deviation of force generated at the contact portion of the fixed platen 20 and the fixed platen support portion 100, and to stably support the fixed platen 20 by each fixed platen support portion 100.

[0097] It can also be that each fixed platen support portion 100 is fixed to the fixed platen 20 by a plurality of second fastening members 106, and the plurality of second fastening members 106 are symmetrically disposed with respect to a plane (F1) that passes through the central axis of the nozzle 46 and is parallel to the mounting surface 10F of the table 10. Thus, it is possible to suppress the deviation of force acting on the plurality of second fastening members 106.

[0098] The plurality of second fastening members 106 can also be symmetrically disposed with respect to a plane (F3) that passes through the thickness center of the fixed platen 20 in the first direction (D11) and is orthogonal to the mounting surface 10F of the table 10. Thus, it is possible to suppress the deviation of force acting on the plurality of second fastening members 106.

Claims

1. An injection molding machine (1), comprising: An injection unit (14) having a nozzle (46) that injects molten material into the interior of a mold (26) fixed to a fixed pressure plate (20) and a movable pressure plate (24); The machine (10) is equipped with the injection unit; A nozzle contact mechanism (16) presses the nozzle onto the mold by moving the injection unit relative to the machine base in a first direction (D11) toward the mold; and A connecting member (18) is slidable relative to the machine base in the first direction and in a second direction (D12) opposite to the first direction. The connecting member (18) connects the nozzle contact mechanism to the fixed pressure plate. The injection molding machine (1) is characterized in that, The connecting member has a support platform (62) slidably mounted relative to the machine base and a wrist (64) extending upward from the fixed pressure plate side of the support platform. The connecting member has a first connecting portion (66) on the support platform that connects to the nozzle contact mechanism, and a second connecting portion (80) on the upper part of the wrist that connects to the fixed pressure plate. The second connecting portion of the connecting member is fixed to the wrist and has a connecting pin (84) extending in the width direction (D3) of the machine tool that is parallel to the mounting surface (10F) of the machine tool and orthogonal to the first direction, and a rotating member (86) fixed to the fixed pressure plate and capable of rotating about the connecting pin. The connecting pin is configured such that it includes a surface (F1) that passes through the central axis of the nozzle and is parallel to the mounting surface of the machine tool.

2. The injection molding machine according to claim 1, characterized in that, It also includes a direct-acting mechanism (70), which is disposed on the machine base for sliding the support platform relative to the machine base in the first direction or the second direction. The support platform is supported on the machine base via the direct motion mechanism.

3. The injection molding machine according to claim 1 or 2, characterized in that, The rotating component is fixed to the fixed pressure plate on both sides, namely the side of the machine base and the side opposite to the machine base, via the connecting pin.

4. The injection molding machine according to claim 1 or 2, characterized in that, The rotating component is fixed to the fixed pressure plate by a plurality of first fasteners (90). The plurality of first fasteners are arranged symmetrically with respect to the central axis passing through the nozzle and parallel to the mounting surface of the machine tool.

5. The injection molding machine according to claim 1 or 2, characterized in that, The second connecting portion is symmetrically arranged with respect to the surface (F2) that passes through the central axis of the nozzle and is orthogonal to the mounting surface of the machine tool.

6. The injection molding machine according to claim 1 or 2, characterized in that, The connecting pin is fixed in a manner that prevents it from rotating relative to the wrist and from sliding relative to the wrist in the pin axis direction.

7. The injection molding machine according to claim 1 or 2, characterized in that, It also includes at least two fixed pressure plate support parts (100) provided on the machine base to support both sides of the fixed pressure plate in the width direction of the machine base.

8. The injection molding machine according to claim 7, characterized in that, The height (H) of each of the fixed pressure plate supports from the mounting surface of the machine base exceeds the plane that passes through the central axis of the nozzle and is parallel to the mounting surface of the machine base.

9. The injection molding machine according to claim 7, characterized in that, The fixed pressure plate is not in contact with the machine tool.

10. The injection molding machine according to claim 7, characterized in that, The fixed pressure plate and each of the fixed pressure plate supports are arranged symmetrically with respect to the central axis passing through the nozzle and orthogonal to the mounting surface of the machine base.

11. The injection molding machine according to claim 7, characterized in that, Each of the fixed pressure plate supports is fixed to the fixed pressure plate by a plurality of second fasteners (106). The plurality of second fasteners are arranged symmetrically with respect to the central axis passing through the nozzle and parallel to the mounting surface of the machine tool.

12. The injection molding machine according to claim 11, characterized in that, The plurality of second fasteners are arranged symmetrically with respect to the surface (F3) that passes through the thickness center of the fixed pressure plate in the first direction and is orthogonal to the mounting surface of the machine tool.

Images