Injection molding machine

Abstract

An injection molding machine according to the present disclosure is provided with: a fixed platen on which a fixed mold is provided; an injection unit which is movable in a direction approaching or separating from the fixed mold and has a nozzle capable of injecting a molten material; a nozzle contact mechanism which is disposed on the lower side of the injection unit, and which presses and attaches the nozzle to the fixed mold by applying a driving force to the injection unit to move the injection unit in a direction in which the injection unit approaches the fixed mold; and a connection member, one end of which is attached to the nozzle contact mechanism and the other end of which is attached to the fixed pressure plate, and which connects the nozzle contact mechanism and the fixed pressure plate. The fixed platen has an intersecting surface that intersects a lateral direction that is orthogonal to the vertical direction and the direction of movement of the injection unit. The other end of the connecting member is attached to the intersecting surface in such a manner that, when the connecting member is pulled toward the injection unit side, a rotational force attempting to rotate about an axis passing through the other end of the connecting member and the intersecting surface and along the lateral direction is applied to the connecting member.

Description

Technical Field

[0001] The present disclosure relates to an injection molding machine having a nozzle contact mechanism. Background Art

[0002] Conventionally, in injection molding machines, resin melted inside the cylinder flows under high pressure into the mold. To prevent resin from leaking out of the nozzle located at the front end of the cylinder, where it contacts the mold, the tip of the nozzle must be pressed against the mold with a strong force. This is called nozzle contact. The force pressing the tip of the nozzle against the mold is called the nozzle contact force. To generate this force, a nozzle contact mechanism is located below the injection unit, which has the nozzle, to move the injection unit closer to or further away from the mold.

[0003] If the motor of the nozzle contact mechanism is rotated in a predetermined direction, the injection unit moves in a direction close to the mold. As a result, the front end of the nozzle of the injection unit can be brought into contact with the mold. If the motor is rotated while the front end of the nozzle is in contact with the mold, the front end of the nozzle is pressed against the mold. As a result, the aforementioned nozzle contact force can be generated. At this time, a tensile force is generated on the ball screw shaft of the nozzle contact mechanism in a direction opposite to the nozzle contact force. In this way, the nozzle contact force is applied to the central portion in the vertical direction of the fixed pressure plate on which the mold is provided, and the tensile force is applied to the lower end portion. As a result, the fixed pressure plate tilts toward the mold side.

[0004] To prevent the fixed platen from tipping over, a proposed method involves connecting the fixed platen and the nozzle contact mechanism with an L-shaped connecting member. In this case, the aforementioned tensile force acts on the vertical center of the fixed platen via the connecting member. Consequently, since the nozzle contact force and the tensile force act on the fixed platen at the same height, tipping over of the fixed platen can be prevented.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-38764

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2010-241076

[0009] Patent Document 3: Japanese Patent Application Publication No. 2019-25701 Summary of the Invention

[0010] Problems to be solved by the invention

[0011] However, even when the fixed platen and the nozzle contact mechanism are connected by a connecting member, there is a concern that the fixed platen could tip over. The connecting member is fixed to the surface of the fixed platen on the injection unit side. In this case, when the aforementioned tensile force acts on the lower end of the connecting member, a rotational force is applied to the connecting member, attempting to rotate the lower end of the connecting member upward. This generates a force that presses down the mounting portion between the fixed platen and the connecting member, posing a risk of the fixed platen tipping slightly toward the injection unit.

[0012] In recent years, due to the demand for higher precision molding, the tolerance of the fixed platen toppling has become stricter than before. In other words, even a slight tilt of the fixed platen will become a problem.

[0013] As described above, the connecting member is fixed to the surface of the fixed platen on the injection unit side. Consequently, the connecting member extends from the fixed platen toward the injection unit. When the injection unit is rotated to clean the cylinder interior, it must be moved away from the mold until it reaches a non-interference position where it does not interfere with the protruding portion of the connecting member. Consequently, the injection molding machine must ensure sufficient stroke to reach this non-interference position. This increases costs and the overall length of the injection molding machine.

[0014] Therefore, in order to solve the above-mentioned problems, an injection molding machine that can achieve a reduction in overall length and more reliably prevent the fixed platen from falling has been desired.

[0015] Solutions for solving problems

[0016] The injection molding machine disclosed herein comprises, on a machine base, a fixed platen on which a fixed mold is mounted; an injection unit that is movable in a direction approaching or separating from the fixed mold and has a nozzle capable of injecting molten material; a nozzle contact mechanism disposed below the injection unit and configured to press the nozzle against the fixed mold by applying a driving force to the injection unit, thereby moving the injection unit toward the fixed mold; and a connecting member having one end attached to the nozzle contact mechanism and the other end attached to the fixed platen, connecting the nozzle contact mechanism and the fixed platen. The fixed platen has an intersecting surface that intersects a transverse direction, the transverse direction being orthogonal to the vertical direction of the fixed platen and the direction of movement of the injection unit. The other end of the connecting member is attached to the intersecting surface of the fixed platen in such a manner that, when the connecting member is pulled toward the injection unit, a rotational force is applied to the connecting member that attempts to rotate about an axis extending along the transverse direction and passing through the other end of the connecting member and the intersecting surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic right side view showing the injection molding machine according to the first embodiment of the present invention, with parts thereof omitted.

[0018] Figure 2 This is a schematic diagram showing an injection molding machine according to a first embodiment of the present invention, and illustrates a fixed platen viewed from the rear side.

[0019] Figure 3 This is a schematic perspective view of an injection molding machine according to a first embodiment of the present invention, showing an attached state of a fixed platen and a connecting member.

[0020] Figure 4 It is a schematic right side view of the injection molding machine according to the first embodiment of the present invention, showing a part thereof in an enlarged manner.

[0021] Figure 5 It is a schematic right side view of an injection molding machine showing a second embodiment of the present invention, and illustrates an attached state of a fixed platen and a connecting member.

[0022] Figure 6 This is a schematic diagram showing an injection molding machine according to a second embodiment of the present invention, and illustrates a fixed platen viewed from the rear side.

[0023] Figure 7 This is a schematic perspective view of an injection molding machine according to a second embodiment of the present invention, showing an attached state of a fixed platen and a connecting member.

[0024] Figure 8 This is a schematic diagram showing a modified example of the injection molding machine of the present invention, and shows a state where the fixed platen is viewed from the back. DETAILED DESCRIPTION

[0025] Hereinafter, an injection molding machine according to one embodiment of the present disclosure will be described with reference to the accompanying drawings. Figures 1 to 4 An injection molding machine 1 according to a first embodiment will be described. The injection molding machine 1 includes a stationary platen 3 , an injection unit 4 , a nozzle contact mechanism 5 , and a connecting member 6 on a machine base 2 .

[0026] In the drawings, the front-back direction D1, the up-down direction D2, and the left-right direction D3 are defined as follows. Specifically, the direction from the injection unit 4 toward the fixed platen 3 is defined as the front direction D11, and the opposite direction is defined as the rear direction D12. These directions are collectively defined as the front-back direction D1. In addition, the upward direction D21 ( Figure 1 The up direction D2 and the down direction D22 in the opposite direction are defined as the up-down direction D2. Figure 3The left-right direction D3 and the right direction D32 in the opposite direction are collectively defined as the left-right direction D3. Arrows indicating the above directions are illustrated in some drawings.

[0027] The fixed platen 3 is a plate (block) that is roughly rectangular when viewed from the front. The fixed platen 3 is fixed to the machine 2 with its surface facing forward and backward. The fixed platen 3 has an insertion hole 7 extending through it in the front-to-back direction D1. The insertion hole 7 is located in the center of the fixed platen 3. The fixed platen 3 has mounting recesses 8 on both its left and right sides for mounting a connecting member 6, described later. The mounting recess 8 formed on the left side of the fixed platen 3 is concave, recessed inwardly of the fixed platen 3, and opens in the rearward direction D12. The mounting recess 8 formed on the right side of the fixed platen 3 is concave, recessed inwardly of the fixed platen 3, and opens in the rearward direction D12. A fixed mold 9 is provided on the front surface of the fixed platen 3. A movable platen (not shown) is provided on the machine 2 at a position forward of the fixed platen 3. The movable platen can be moved in the front-to-back direction D1 by a drive mechanism (not shown). A movable mold (not shown) is provided on the rear side of the movable platen. To close the fixed mold 9 and the movable mold, the driving mechanism moves the movable platen toward the rear direction D12, which is the direction in which the movable platen approaches the fixed platen 3. To open the fixed mold 9 and the movable mold, the driving mechanism moves the movable platen toward the front direction D11, which is the direction in which the movable platen separates from the fixed platen 3.

[0028] The injection unit 4 is arranged at a position further back than the fixed platen 3. The injection unit 4 includes a base portion 10, a main body portion 11, a cylinder portion 12, and a nozzle 13. The base portion 10 includes a mounting portion 14 for mounting the main body portion 11 described later, and an extension portion 15 extending from the mounting portion 14 in a downward direction D22. The main body portion 11 is rotatably provided on the mounting portion 14. The main body portion 11 is rotatably mounted on the upper side of the mounting portion 14 around a swivel pin (not shown) along the up-down direction D2. A cylinder portion 12 extending from the main body portion 11 toward the fixed platen 3 is provided on the front side of the main body portion 11. A nozzle 13 capable of injecting molten material is provided at the front end of the cylinder portion 12.

[0029] The injection unit 4 is capable of moving in a direction toward or away from the fixed mold 9. Therefore, in the illustrated example, the injection unit 4 is supported on the machine table 2 via a pair of linear guides 16, 16 spaced apart in the left-right direction D3. The pair of linear guides 16, 16 enables the injection unit 4 to move linearly in the front-to-back direction D1 relative to the machine table 2. The pair of linear guides 16, 16 each includes a guide rail 17 and a guide block 18. The guide rail 17 is provided on the machine table 2 so as to extend in the front-to-back direction D1. The guide block 18 is capable of moving in the front-to-back direction D1 on the guide rail 17 while being embedded in the guide rail 17. The guide block 18 is provided at the lower end of the injection unit 4. In this embodiment, the guide block 18 is provided at the lower end of the base portion 10. Due to this structure, the injection unit 4 is capable of moving in the front-to-back direction D1 along the guide rail 17. In the illustrated example, there are two guide blocks 18 provided on one guide rail 17. One of the two guide blocks 18 is provided at the front side of the injection unit 4, and the other guide block 18 is provided at the rear side of the injection unit 4. The number of guide blocks 18 provided on one guide rail 17 is not limited thereto and may be one or three or more.

[0030] The nozzle contact mechanism 5 is arranged on the lower side of the injection unit 4. The nozzle contact mechanism 5 has a motor 19, a ball screw shaft 20, a ball screw nut 21 and a spring 22. The motor 19 is provided on the machine 2. The motor 19 is arranged at a position further back than the injection unit 4. The ball screw shaft 20 is rod-shaped and has a thread formed on the outer peripheral surface. The ball screw shaft 20 is arranged on the machine 2 in a manner along the front-to-back direction D1. The rear end of the ball screw shaft 20 is connected to the rotor shaft of the motor 19 via a coupling 23. The front end of the ball screw shaft 20 is mounted on the connecting member 6 described later. At this time, the ball screw shaft 20 can rotate around its own axis. The ball screw nut 21 is nut-shaped and is screwed into the ball screw shaft 20. The ball screw nut 21 is arranged at a position further back than the extension 15 of the injection unit 4. The ball screw nut 21, which is positioned further rearward than the extension 15, is attached to the extension 15 via a spring 22. At this point, the ball screw nut 21 is non-rotatable relative to the extension 15. Thus, the ball screw nut 21 is provided in the injection unit 4 so that it is non-rotatable relative to the injection unit 4 while being screwed into the ball screw shaft 20.

[0031] Due to such a structure, if the motor 19 is rotated in a predetermined direction, the ball screw shaft 20 can be rotated around its own axis. When the ball screw shaft 20 rotates, the ball screw nut 21 screwed into the ball screw shaft 20 moves along the ball screw shaft 20 in the forward direction D11. As a result, the injection unit 4 equipped with the ball screw nut 21 can be moved in the forward direction D11. At this time, the injection unit 4 moves in the forward direction D11 along the guide rail 17. In addition, if the motor 19 is rotated in a direction opposite to the aforementioned predetermined direction, the ball screw nut 21 screwed into the ball screw shaft 20 moves along the ball screw shaft 20 in the backward direction D12. As a result, the injection unit 4 equipped with the ball screw nut 21 can be moved in the backward direction D12.

[0032] The connecting member 6 is a component that connects the nozzle contact mechanism 5 and the fixed pressure plate 3. One end of the connecting member 6 is mounted on the nozzle contact mechanism 5, and the other end of the connecting member 6 is mounted on the fixed pressure plate 3. In this embodiment, the connecting member 6 is roughly L-shaped when viewed from the side, and has a support platform 24 and a pair of arms 25, 25. The support platform 24 is a plate-shaped plate that is roughly quadrilateral when viewed from above. The support platform 24 is arranged on the machine 2 so that the plate surface faces up and down. The pair of arms 25, 25 are respectively rod-shaped. The pair of arms 25, 25 are upright on the fixed pressure plate 3 side of the support platform 24, that is, on the front side. In the example shown in the figure, the pair of arms 25, 25 are fixed to the support platform 24 by bolts 26 or the like. The pair of arms 25, 25 are arranged on the support platform 24 at intervals in the left-right direction D3. The pair of arms 25, 25 extend from the support platform 24 in the upward direction D21, then extend obliquely upward toward the front, and further extend in the forward direction D11. Thus, the front ends of the pair of arms 25, 25 face the forward direction D11. In this embodiment, the support platform 24 and the pair of arms 25, 25 are separate components, but this is not limiting and they may also be integrally formed.

[0033] The support base 24 of the connecting member 6 is attached to the front end of the ball screw shaft 20. The front end of the ball screw shaft 20 is supported by a bearing 27 provided on the support base 24. Thus, the ball screw shaft 20 is rotatable relative to the support base 24. Thus, one end of the connecting member 6 is attached to the nozzle contact mechanism 5.

[0034] Meanwhile, the other end of the connecting member 6 is attached to the fixed platen 3. The fixed platen 3 has an intersecting surface 28 that intersects a transverse direction perpendicular to the vertical direction of the fixed platen 3 and the direction of movement of the injection unit 4. In this embodiment, the fixed platen 3 is plate-shaped and is mounted on the machine table 2 with its surface facing forward and backward. In this case, the vertical direction of the fixed platen 3 is the vertical direction D2 in the figures. The direction of movement of the injection unit 4 is the direction in which the injection unit 4 approaches or separates from the fixed mold 9, and is the front-to-back direction D1 in the figures. The transverse direction is a direction perpendicular to the vertical direction D2 and the front-to-back direction D1, and is therefore the left-to-right direction D3. The surfaces of the outer surface of the fixed platen 3 that intersect the left-to-right direction D3 are the left and right side surfaces of the fixed platen 3. In other words, the intersecting surface 28 of the fixed platen 3 is the left and right side surfaces of the fixed platen 3. Since the left and right side surfaces of the fixed platen 3 are the intersecting surface 28, the fixed platen 3 has two intersecting surfaces 28, 28. The left and right side surfaces of the fixed platen 3 are located at intervals. Therefore, one of the two intersecting surfaces 28 , 28 is located on one end side in the transverse direction, and the other intersecting surface 28 is located on the other end side in the transverse direction.

[0035] The other end of the connecting member 6 is attached to the intersection surface 28 of the fixed platen 3. In this embodiment, a pair of arms 25, 25 of the connecting member 6 are attached to the two intersection surfaces 28, 28 of the fixed platen 3, respectively. The arm 25 on the left side is attached to the mounting recess 8 on the left side of the fixed platen 3. Specifically, with the front end of the left arm 25 accommodated in the mounting recess 8 on the left side of the fixed platen 3, a bolt 29 is screwed into the fixed platen 3 through the front end of the arm 25, thereby attaching the left arm 25 to the left side of the fixed platen 3. The arm 25 on the right side is attached to the mounting recess 8 on the right side of the fixed platen 3. Specifically, with the front end of the right arm 25 accommodated in the mounting recess 8 on the right side of the fixed platen 3, a bolt 29 is screwed into the fixed platen 3 through the front end of the arm 25, thereby attaching the right arm 25 to the right side of the fixed platen 3.

[0036] Since the arm portions 25 attached to the fixed platen 3 are a pair, the connecting member 6 has two other end portions attached to the fixed platen 3. Since the pair of arm portions 25, 25 are spaced apart in the left-right direction D3, the connecting member 6 has a left arm portion 25 and a right arm portion 25 that branch into two branches on the front side. Thus, the connecting member 6 has two other end portions that branch. The left arm portion 25 is attached to the left side of the fixed platen 3, and the right arm portion 25 is attached to the right side of the fixed platen 3. Thus, one other end portion of the connecting member 6 is attached to an intersection surface 28 located on one end side in the transverse direction, which is the left-right direction D3, and the other other end portion of the connecting member 6 is attached to an intersection surface 28 located on the other end side in the transverse direction.

[0037] The first mounting portion 30, which serves as the mounting portion between the left arm 25 and the left intersection surface 28 of the fixed platen 3, i.e., the left side surface, and the second mounting portion 31, which serves as the mounting portion between the right arm 25 and the right intersection surface 28 of the fixed platen 3, i.e., the right side surface, are located point-symmetrically with respect to an axis 32 that passes through the center of the fixed platen 3 and extends along the front-to-back direction D1. The first mounting portion 30 and the second mounting portion 31 are located at the center of the fixed platen 3 in the up-down direction D2. The first mounting portion 30 is located at the center of the left intersection surface 28 of the fixed platen 3 in the front-to-back direction D1. The second mounting portion 31 is located at the center of the right intersection surface 28 of the fixed platen 3 in the front-to-back direction D1.

[0038] like Figure 2 As shown, the fixed platen 3 is supported on the machine 2 by a pair of platen support members 33, 33. The pair of platen support members 33, 33 are respectively columnar. The pair of platen support members 33, 33 are vertically arranged on the machine 2. In the example shown in the figure, the pair of platen support members 33, 33 are fixed to the machine 2 by bolts 34 and the like. The left end portion of the fixed platen 3 is fixed to the platen support member 33 located on the left side of the pair of platen support members 33, 33. Specifically, when the front end portion of the left arm 25 is in contact with the platen support member 33 on the left side, the bolt 29 is screwed into the fixed platen 3 via the platen support member 33 on the left side and the arm 25 on the left side, thereby fixing the fixed platen 3 to the platen support member 33 on the left side. The right end portion of the fixed platen 3 is fixed to the platen support member 33 on the right side of the pair of platen support members 33, 33. Specifically, with the front end of the right arm 25 in contact with the right platen support member 33, bolts 29 are screwed into the fixed platen 3 via the right platen support member 33 and the right arm 25, thereby securing the fixed platen 3 to the right platen support member 33. In this manner, the fixed platen 3 is secured to the machine table 2 via the pair of platen support members 33, 33. In the illustrated example, the bolts securing the arm 25 to the fixed platen 3 and the bolts securing the fixed platen 3 to the platen support member 33 are the same bolts 29.

[0039] As described above, the nozzle contact mechanism 5 and the fixed platen 3 are connected via the connecting member 6. Figure 3As shown in FIG. 1 , the connecting member 6 is supported on the machine 2 by a pair of linear guides 35 and 35. The pair of linear guides 35 and 35 are arranged on the machine 2 at intervals in the lateral direction, which is the left-right direction D3. The pair of linear guides 35 and 35 can linearly move the connecting member 6 relative to the machine 2 in the moving direction of the injection unit 4. The pair of linear guides 35 and 35 each include a guide rail 36 and a guide block 37. The guide rail 36 is provided on the machine 2 so as to extend in the front-to-back direction D1. The guide block 37 can move on the guide rail 36 in the front-to-back direction D1 while being embedded in the guide rail 36. The guide block 37 is provided at the lower end of the connecting member 6. In this embodiment, the guide block 37 is provided at the lower end of the support platform 24. Due to such a structure, the connecting member 6 can move in the front-to-back direction D1 along the guide rail 36. Furthermore, since the guide block 37 is fitted into the guide rail 36 , the connecting member 6 cannot move in the up-down direction D2 and the left-right direction D3 .

[0040] Next, the operation of the injection molding machine 1 according to this embodiment will be described. To manufacture a molded product using the injection molding machine 1, the mold 38, consisting of the fixed mold 9 and the movable mold, is first clamped. To clamp the mold 38, the movable mold is simply moved toward the fixed mold 9. After the mold 38 is clamped, the injection process of injecting molten material into the mold 38 is performed.

[0041] During the injection process, the nozzle contact mechanism 5 moves the injection unit 4 toward the fixed mold 9. Specifically, the motor 19 rotates in a predetermined direction, causing the ball screw shaft 20 to rotate about its axis, and the ball screw nut 21 to move forward along the ball screw shaft 20 in the forward direction D11. This causes the injection unit 4, with the ball screw nut 21 attached, to move forward along the guide rail 17 in the forward direction D11. As the injection unit 4 moves forward in the forward direction D11, the nozzle 13 of the injection unit 4 contacts the sprue of the fixed mold 9 through the insertion hole 7 of the fixed platen 3. Further rotation of the motor 19 in the predetermined direction while the nozzle 13 is in contact with the fixed mold 9 compresses the spring 22. As the spring 22 compresses, the injection unit 4 attempts to move further in the forward direction D11 due to the compression reaction force of the spring 22. This causes the nozzle 13 of the injection unit 4 to be pressed against the sprue of the fixed mold 9. In this manner, the nozzle contact mechanism 5 applies a driving force to the injection unit 4, thereby moving the injection unit 4 in a direction approaching the fixed mold 9, thereby being able to press the nozzle 13 against the fixed mold 9. While the nozzle 13 of the injection unit 4 is pressed against the fixed mold 9, the molten material of resin or metal is injected into the mold 38 from the nozzle 13 of the injection unit 4.

[0042] like Figure 4As shown, when the nozzle 13 of the injection unit 4 is pressed against the fixed mold 9, a tensile force F1 is generated on the ball screw shaft 20 of the nozzle contact mechanism 5 in a direction opposite to the nozzle contact force. This exerts a rotational force on the connecting member 6, attempting to rotate about an axis extending along the left-right direction D3 and passing through the first and second mounting portions 30 and 31. This rotational force exerted on the connecting member 6 generates a force F2 in the downward direction D22 on the first and second mounting portions 30 and 31.

[0043] In the case of conventional injection molding machines, the mounting portion between the connecting member and the fixed platen is located on the surface of the fixed platen on the injection unit side. Therefore, when a rotational force is applied to the connecting member as described above, a downward force is applied to the end of the fixed platen on the injection unit side, and there is a concern that the fixed platen may tilt toward the injection unit side. In contrast, in the case of the injection molding machine 1 of the present embodiment, the first mounting portion 30 is located at the left end of the fixed platen 3, and the second mounting portion 31 is located at the right end of the fixed platen 3. In this case, as Figure 4 As shown, when a rotational force is applied to the connecting member 6, a force F2 is generated in the downward direction D22 to push down the first mounting portion 30 and the second mounting portion 31. Therefore, according to the injection molding machine 1 of this embodiment, a force is less likely to be generated in the direction in which the fixed platen 3 tilts.

[0044] In the injection molding machine 1 of this embodiment, the first mounting portion 30, located between the intersecting surface 28 at one end in the transverse direction (left-right direction D3) and one end of the connecting member 6, and the second mounting portion 31, located between the intersecting surface 28 at the other end in the transverse direction and the other end of the connecting member 6, are positioned point-symmetrically about an axis 32 that passes through the center of the stationary platen 3 and lies along the direction of movement of the injection unit 4. In the injection molding machine 1 of this embodiment, the first mounting portion 30 and the second mounting portion 31 are located at the center of the stationary platen 3 in the vertical direction D2. Therefore, according to the injection molding machine 1 of this embodiment, when heat generated in the mold 38 during the manufacture of a molded product causes the stationary platen 3 to thermally deform, the stationary platen 3 can be deformed vertically symmetrically. This maintains the precision of the molded product.

[0045] In the case of the injection molding machine 1 of this embodiment, the attachment portion between the other end portion of the connecting member 6 and the intersecting surface 28 is located at the center of the intersecting surface 28 in the moving direction of the injection unit 4. Therefore, according to the injection molding machine 1 of this embodiment, it is possible to more reliably prevent the fixed platen 3 from falling in the front-rear direction D1.

[0046] Furthermore, injection molding has become more diverse in recent years, leading to the use of smaller cylinders than before. In this case, the injection unit 4 must be brought closer to the fixed platen 3, necessitating a smaller connecting member 6. Miniaturizing the connecting member 6 prevents the installation of multiple guide blocks 37 of the linear guide 35 supporting the connecting member 6 on the machine table 2 on a single guide rail 36. Consequently, the rotational motion of the connecting member 6 increases, increasing the risk of the fixed platen 3 tipping over. However, the injection molding machine 1 of this embodiment prevents the fixed platen 3 from tipping over as described above, making it less likely to cause problems even if only one guide block 37 is installed on a single guide rail 36.

[0047] Next, use Figures 5 to 7 The following describes an injection molding machine 1a according to a second embodiment of the present invention. Components designated with the same reference numerals as those in the first embodiment have the same functions, and therefore their descriptions may be omitted. The injection molding machine 1a according to the second embodiment differs from the first embodiment in the mounting structure of the connecting member 6 and the fixed platen 3.

[0048] like Figure 6 As shown, a pair of protrusions 39, 39 are provided on the left side of the stationary platen 3, sandwiching the mounting recess 8. The pair of protrusions 39, 39 protrude from the left side of the stationary platen 3 in the left direction D31. The stationary platen 3 is attached to the left platen support member 33 via the pair of protrusions 39, 39. Specifically, while the pair of protrusions 39, 39 on the left side of the stationary platen 3 are in contact with the left platen support member 33, bolts 29 are screwed into the pair of protrusions 39, 39 via the left platen support member 33, thereby securing the stationary platen 3 to the left platen support member 33. A pair of protrusions 39, 39 are provided on the right side of the stationary platen 3, sandwiching the mounting recess 8. The pair of protrusions 39, 39 protrude from the right side of the stationary platen 3 in the right direction D32. The stationary platen 3 is attached to the right platen support member 33 via the pair of protrusions 39, 39. Specifically, when a pair of protrusions 39, 39 on the right side of the fixed pressure plate 3 are in contact with the right pressure plate support member 33, the bolts 29 are screwed into the pair of protrusions 39, 39 on the right side through the right pressure plate support member 33, thereby fixing the fixed pressure plate 3 to the right pressure plate support member 33.

[0049] In the injection molding machine 1a of the second embodiment, a round rod-shaped shaft portion 40 is provided so as to be extended between the left platen support member 33 and the fixed platen 3. The shaft portion 40 passes through the front end portion of the left arm portion 25 housed in the left mounting recess 8. In the injection molding machine 1a of the second embodiment, a round rod-shaped shaft portion 40 is provided so as to be extended between the right platen support member 33 and the fixed platen 3. The shaft portion 40 passes through the front end portion of the right arm portion 25 housed in the right mounting recess 8. In this way, the other end portion of the connecting member 6 is attached to the intersection surface 28 via the shaft portion 40 along the lateral direction, which is the left-right direction D3. As a result, the connecting member 6 can rotate around the shaft portion 40.

[0050] In the injection molding machine 1a of the second embodiment, the other end of the connecting member 6 is rotatably mounted on the fixed platen 3 about an axis 40 extending in the lateral direction (left-right direction D3). Therefore, the injection molding machine 1a of the second embodiment can reduce the torque load applied when the connecting member 6 rotates about the axis 40.

[0051] According to at least one embodiment described above, the other end of the connecting member 6 is attached to the intersecting surface 28 of the fixed platen 3 in such a manner that, when the connecting member 6 is pulled toward the injection unit 4, a rotational force is applied to the connecting member 6, attempting to rotate about an axis passing through the other end of the connecting member 6 and the intersecting surface 28 and in the transverse direction. Consequently, it is possible to provide an injection molding machine that can suppress protrusion of the connecting member 6, thereby achieving a reduction in overall length, and can more reliably prevent the fixed platen 3 from tipping over.

[0052] The present disclosure has been described in detail, but the present disclosure is not limited to the above-mentioned embodiments. These embodiments can be variously added, replaced, changed, partially deleted, etc. without departing from the scope of the gist of the present disclosure, or without departing from the scope of the gist of the present disclosure derived from the contents recorded in the claims and their equivalents. In addition, these embodiments can also be implemented in combination. For example, in the above-mentioned embodiments, the order of each action and the order of each processing are shown as an example, and are not limited to the order of each action and the order of each processing. In addition, the same applies to the case where numerical values or formulas are used in the description of the above-mentioned embodiments.

[0053] For example, in the above-described embodiments, the height of the first mounting portion 30 and the height of the second mounting portion 31 are set to be substantially the same, but they may also be set to be substantially the same as shown in FIG. Figure 8 In this case, the first mounting portion 30 and the second mounting portion 31 are located at positions that are point-symmetrical with respect to the axis 32 of the fixed platen 3 .

[0054] The following supplementary notes are further disclosed regarding the above-mentioned embodiment.

[0055] (Note 1)

[0056] The injection molding machine (1) comprises on a machine table (2): a fixed platen (3) on which a fixed mold (9) is provided; an injection unit (4) which is movable in a direction approaching or separating from the fixed mold (9) and has a nozzle (13) capable of injecting molten material; a nozzle contact mechanism (5) which is arranged on the lower side of the injection unit (4) and which moves the injection unit (4) in a direction approaching the fixed mold (9) by applying a driving force to the injection unit (4), thereby pressing the nozzle (13) against the fixed mold (9); and a connecting member (6) having one end mounted on the nozzle contact mechanism (5) and the other end mounted on the fixed platen (3) so as to connect the nozzle contact mechanism (5) and the fixed platen (3). The fixed platen (3) has an intersecting surface (28) intersecting a transverse direction, and the transverse direction is orthogonal to the vertical direction of the fixed platen (3) and the moving direction of the injection unit (4). The other end of the connecting member (6) is mounted on the intersection surface (28) of the fixed pressure plate (3) in such a manner that when the connecting member (6) is pulled toward the injection unit (4), a rotational force is applied to the connecting member (6) that attempts to rotate around an axis passing through the other end of the connecting member (6) and the intersection surface (28) and along the transverse direction.

[0057] (Note 2)

[0058] For the injection molding machine (1), in Note 1, it is preferred that the other end of the connecting member (6) is mounted on the intersection surface (28) via an axis (40) along the transverse direction, and the connecting member (6) is rotatable around the axis (40).

[0059] (Note 3)

[0060] For the injection molding machine (1), in Note 1 or Note 2, it is preferred that the fixed platen (3) has two cross-surfaces (28), one cross-surface (28) is located at one end side of the transverse direction, and the other cross-surface (28) is located at the other end side of the transverse direction. Preferably, the connecting member (6) has two branched other end portions, one of which is mounted on the cross-surface (28) located at one end side of the transverse direction, and the other of which is mounted on the cross-surface (28) located at the other end side of the transverse direction. Preferably, the first mounting portion (30) between the cross-surface (28) located at one end side of the transverse direction and one of the other end portions, and the second mounting portion (31) between the cross-surface (28) located at the other end side of the transverse direction and the other of which is located are located in point-symmetrical positions relative to an axis (32), and the axis (32) passes through the center of the fixed platen (3) and is along the moving direction.

[0061] (Note 4)

[0062] Regarding the injection molding machine (1), in Supplementary Note 3, it is preferred that the first mounting portion (30) and the second mounting portion (31) are located at a central portion in the vertical direction of the fixed platen (3).

[0063] (Note 5)

[0064] For the injection molding machine (1), in any one of Notes 1 to 4, it is preferred that the mounting portion between the intersection surface (28) and the other end portion of the connecting member (6) is located at the center of the intersection surface (28) in the direction along the moving direction.

[0065] (Note 6)

[0066] In the injection molding machine (1), in any one of Supplementary Notes 1 to 5, it is preferred that the machine be provided with a pair of linear guide rails (35, 35), wherein the pair of linear guide rails (35, 35) can support the connecting member (6) and can linearly move the connecting member (6) relative to the machine table (2) along the moving direction. Preferably, the pair of linear guide rails (35, 35) are arranged to be spaced apart in the lateral direction.

[0067] Description of Reference Numerals

[0068] 1. Injection molding machine; 2. Machine table; 3. Fixed platen; 4. Injection unit; 5. Nozzle contact mechanism; 6. Connecting member; 9. Fixed mold; 13. Nozzle; 28. Intersection surface; 30. First mounting part; 31. Second mounting part; 32. Axis; 35. Linear guide; 40. Shaft.

Claims

1. An injection molding machine, wherein: The injection molding machine has the following features on the machine platform: A fixed pressing plate, which is provided with a fixed mold; an injection unit capable of moving in a direction of approaching or separating relative to the fixed mold, and having a nozzle capable of injecting molten material; a nozzle contact mechanism disposed on a lower side of the injection unit, which moves the injection unit toward the fixed mold by applying a driving force to the injection unit, thereby pressing the nozzle against the fixed mold; and A connecting member, one end of which is mounted on the nozzle contact mechanism and the other end of which is mounted on the fixed pressure plate, so as to connect the nozzle contact mechanism and the fixed pressure plate. The fixed platen has an intersecting surface intersecting a transverse direction, the transverse direction being orthogonal to the up-down direction of the fixed platen and the moving direction of the injection unit. The other end portion of the connecting member is mounted on the intersection surface of the fixed platen in such a manner that, when the connecting member is pulled toward the injection unit, a rotational force is applied to the connecting member that attempts to rotate about an axis passing through the other end portion of the connecting member and the intersection surface and along the transverse direction.

2. The injection molding machine according to claim 1, wherein The other end of the connecting member is mounted on the intersection surface via an axis portion along the transverse direction. The connecting member is rotatable around the shaft portion.

3. The injection molding machine according to claim 1 or 2, wherein: The fixed plate has two intersection surfaces. One of the intersection surfaces is located on one end side in the transverse direction, and the other intersection surface is located on the other end side in the transverse direction. The connecting member has two other end portions that are branched, One of the other end portions is mounted on the intersection surface located on one end side in the transverse direction, and the other of the other end portions is mounted on the intersection surface located on the other end side in the transverse direction. The first mounting portion located between the intersection surface on one end side of the transverse direction and one of the other ends, and the second mounting portion located between the intersection surface on the other end side of the transverse direction and the other of the other ends are located at positions that are point-symmetrical with respect to an axis that passes through the center of the fixed pressure plate and is along the moving direction.

4. The injection molding machine according to claim 3, wherein: The first mounting portion and the second mounting portion are located at a center portion of the fixed platen in a vertical direction.

5. The injection molding machine according to any one of claims 1 to 4, wherein The mounting portion between the intersection surface and the other end portion of the connecting member is located at a center portion of the intersection surface in a direction along the moving direction.

6. The injection molding machine according to any one of claims 1 to 5, wherein The injection molding machine includes a pair of linear guide rails, the pair of linear guide rails being capable of supporting the connecting member and enabling the connecting member to linearly move relative to the machine table in the moving direction. The pair of linear guide rails are arranged to be spaced apart in the lateral direction.

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