Injection device and injection molding machine

Abstract

Provided are an injection device and an injection molding machine capable of reducing maintenance time. An injection device (4A) provided with a pair of piston cylinder units (26A, 27A) on both sides of a heating cylinder (14A) is taken as an object. One end (41A, 42A) of each of the pair of piston cylinder units (26A, 27A) is connected to a mold clamping device (2), and the heating cylinder (14A) is integrally driven in a direction of approaching or leaving the mold clamping device (2) by extending and contracting the pair of piston cylinder units (26A, 27A). The present disclosure configures one of the pair of piston cylinder units (26A, 27A) as a stop unit piston cylinder unit provided with a stop unit (40A) that does not allow extension and contraction.

Description

Technical Field

[0001] The present invention relates to an injection apparatus and an injection molding machine, and more particularly, to an injection apparatus and an injection molding machine driven by a pair of piston cylinder units in a direction relative to or away from a mold clamping device. Background Technology

[0002] The injection device, as described in Patent Document 1, includes a heating cylinder, a screw placed inside the heating cylinder, and a pair of piston cylinder units disposed on both sides of the heating cylinder. One end of each piston cylinder unit is connected to a mold clamping device, and the other end is connected to a component of the injection device. By extending or retracting the pair of piston cylinder units, the injection device approaches or moves away from the mold clamping device. This allows the injection nozzle, located at the front end of the heating cylinder, to contact or move away from the mold.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-255476 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In injection molding machines, when performing maintenance such as replacing the heating cylinder, screw, or injection nozzle, it is necessary to first disconnect a pair of piston cylinder units from the mold clamping device. The connection between the pair of piston cylinder units and the mold clamping device is then released, and the injection molding machine is rotated using a rotary mechanism. Alternatively, the injection molding machine can be raised or lowered using a lifting mechanism. Then, the injection molding machine is maintained. After maintenance is complete, the injection molding machine is returned to its original position, and the pair of piston cylinder units are reconnected to the mold clamping device. Thus, whenever maintenance is performed on the injection molding machine, the connection between the pair of piston cylinder units and the mold clamping device must be released beforehand and reconnected after maintenance. This results in an increased operation time.

[0008] This disclosure provides an injection apparatus and an injection molding machine that can reduce the operation time required for maintenance.

[0009] Other topics and novel adjustments should become clear from the descriptions and accompanying drawings in this manual.

[0010] Methods for solving problems

[0011] This disclosure describes an injection molding device comprising a heating cylinder, a screw disposed within the heating cylinder, and a pair of piston cylinder units disposed on both sides of the heating cylinder. One end of each of the pair of piston cylinder units is connected to a mold clamping device, and the heating cylinder and screw are integrally driven in a direction approaching or moving away from the mold clamping device by extending or retracting the pair of piston cylinder units. This disclosure configures one of such a pair of piston cylinder units as a piston cylinder unit with a stop unit that prevents extension or retraction.

[0012] Invention Effects

[0013] This disclosure allows for the reduction of operation time by eliminating the need to disconnect the piston cylinder unit with the stop unit from the mold closing device during maintenance of the injection unit. Attached Figure Description

[0014] Figure 1 This is a top view showing the dual injection molding machine of this embodiment.

[0015] Figure 2 This is a hydraulic circuit diagram illustrating the mobile device of the first embodiment.

[0016] Figure 3 This is a hydraulic circuit diagram illustrating the mobile device of the first embodiment.

[0017] Figure 4 This is a hydraulic circuit diagram illustrating the mobile device of the first embodiment.

[0018] Figure 5 This is a hydraulic circuit diagram illustrating the mobile device of the first embodiment.

[0019] Figure 6 This is a top view showing the dual injection molding machine of this embodiment.

[0020] Figure 7 This is a hydraulic circuit diagram illustrating the mobile device of the first embodiment.

[0021] Figure 8 This is a top view showing the injection molding machine of this embodiment.

[0022] Figure 9 This is a top view showing the injection molding machine of this embodiment.

[0023] Figure 10 This is a hydraulic circuit diagram illustrating the mobile device according to the second embodiment.

[0024] Figure 11 This is a hydraulic circuit diagram illustrating the mobile device according to the third embodiment.

[0025] Explanation of reference numerals in the attached figures

[0026] 1. Dual injection molding machine 2. Mold clamping device

[0027] 4A First injection device 4B Second injection device

[0028] C Mechanical centerline 5 Base

[0029] 6. Fixed plate 7. Movable plate

[0030] 8 Mold housing 10 Tie rod

[0031] 12 Toggle Mechanism 14A Heating Cylinder

[0032] 15A Screw drive unit; 18A Support frame

[0033] 20A First Board 21A Second Board

[0034] 22A Third Board 25A Moving Device

[0035] 26A Outer piston cylinder unit; 27A Inner piston cylinder unit

[0036] 29A U-shaped clamp 30A hydraulic supply mechanism

[0037] 31A Hydraulic power source; 32A Pressure reducing valve

[0038] 34A Directional switching valve; 36A First pilot check valve

[0039] 37A Second Pilot Check Valve; 39A Oil Tank

[0040] 40A Stop Unit 41A One End

[0041] 42A One end 43A The other end

[0042] 44A The other end 45A Stop valve

[0043] 57A Solenoid On / Off Valve Detailed Implementation

[0044] The following describes the specific implementation method, referring to the appendix. Figure 1 The following is a detailed description. However, the embodiments described below are not limited to. To make the description clear, the following description and drawings have been appropriately simplified. In each drawing, the same reference numeral is used to label the same element, and repeated descriptions have been omitted as needed. In addition, some parts have had their shading omitted to avoid making the drawings complicated.

[0045] <The dual injection molding machine of this embodiment>

[0046] like Figure 1As shown, the dual injection molding machine 1 of this embodiment consists of a mold clamping device 2 and first and second injection devices 4A and 4B. The dual injection molding machine 1 of this embodiment is a so-called metal injection molding machine that melts and injects metal. However, the present invention can be implemented not only for metal injection molding machines, but also for injection molding machines that inject resin.

[0047] <Mold Closing Device>

[0048] The mold clamping device 2 includes a fixed plate 6 fixed relative to the base 5, a movable plate 7 slidable on the base 5, and a mold clamping housing 8 slidable on the base 5. The fixed plate 6 and the mold clamping housing 8 are connected by multiple connecting rods 10, 10, ... The movable plate 7 is configured to slide freely between the fixed plate 6 and the mold clamping housing 8. A toggle mechanism 12, serving as a mold clamping mechanism, is provided between the mold clamping housing 8 and the movable plate 7. If a drive system component (not shown) (e.g., a mold clamping motor) is driven to extend or retract the toggle mechanism 12, the movable plate 7 slides to open and close the mold. It should be noted that the mold clamping mechanism is not limited to the toggle mechanism 12; a mold clamping cylinder or the like can be used.

[0049] <Injection device>

[0050] In this embodiment, the first and second injection devices 4A and 4B are symmetrically arranged with respect to the mechanical center line C of the mold clamping device 2. The components constituting the first and second injection devices 4A and 4B are also substantially symmetrical with respect to the mechanical center line C. Therefore, only one injection device, namely the first injection device 4A, will be described, and the description of the second injection device 4B will be omitted unless necessary. It should be noted that the components of the first injection device 4A are labeled with reference numerals combined with "A", and the corresponding components in the second injection device 4B are labeled with the same reference numerals combined with "B".

[0051] The first injection device 4A includes a heating cylinder 14A, a screw (not shown) placed in the heating cylinder 14A, and a screw drive device 15A that drives the screw in the rotational direction and axial direction. Originally, the rear end of the screw is connected to the screw drive device 15A, and the screw is driven by the screw drive device 15A. Thus, in... Figure 1 The rear end of the screw should be shown. However, in Figure 1 The image shows the screw completely housed within the heating cylinder 14A after being cut off from the screw drive device 15A. In other words, it is positioned such that the heating cylinder 14A and the screw can be removed from the first injection device 4A using a crane for maintenance or other purposes.

[0052] The first injection device 4A is supported by a support frame 18A. The support frame 18A includes first to third plates 20A, 21A, and 22A. Multiple rods connect the first and second plates 20A and 21A to the second and third plates 21A and 22A. The heating cylinder 14A is supported at its central and rear ends by the first and second plates 20A and 21A, respectively. Furthermore, a screw drive device 15A is mounted on the third plate 22A.

[0053] <Mobile Devices>

[0054] The first injection device 4A includes a moving device 25A, as described in the first embodiment, which moves the heating cylinder 14A, screw, etc., closer to or further away from the mold clamping device 2. The moving device 25A includes a pair of piston cylinder units 26A and 27A. These piston cylinder units 26A and 27A are arranged on both sides of the heating cylinder 14A, with one side located away from the mechanical centerline C (i.e., the outer side) and the other side located closer to the mechanical centerline C (i.e., the inner side).

[0055] Hereinafter, the pair of piston cylinder units 26A and 27A will be appropriately referred to as outer piston cylinder unit 26A and inner piston cylinder unit 27A. Both outer and inner piston cylinder units 26A and 27A have one end 41A and 42A connected to the fixed plate 6, and the other end 43A and 44A connected to the U-shaped clamps 29A and 29A of the third plate 22A provided on the support frame 18A.

[0056] The outer and inner piston cylinder units 26A and 27A extend and retract by hydraulic oil supplied by the hydraulic supply mechanism described below. During extension and retraction, the heating cylinder 14A, screw, etc., approach or move away from the mold clamping device 2. Although described later, the inner piston cylinder unit 27A, which is closer to the mechanical centerline C, has a stop unit in its hydraulic circuit that obstructs the supply of hydraulic oil, preventing extension and retraction. In other words, the inner piston cylinder unit 27A becomes a piston cylinder unit 27A with a stop unit.

[0057] Hydraulic circuit of mobile device

[0058] Mobile device 25A has Figure 2 The hydraulic supply mechanism 30A is shown. The hydraulic supply mechanism 30A includes a hydraulic source 31A, a pressure reducing valve 32A, a directional switching valve 34A, and first and second pilot check valves 36A and 37A. Hydraulic oil supplied from the hydraulic source 31A is regulated by the pressure reducing valve 32A and delivered to the directional switching valve 34A. The directional switching valve 34A is a so-called 4-port 3-position directional control valve with four ports (A, B, P, and T) and switchable to three positions via two solenoids (a and b). The directional switching valve 34A supplies hydraulic oil to port A or port B, or stops supplying it.

[0059] Port A of the directional switching valve 34A is connected to the first pilot check valve 36A, and a branch of the hydraulic oil line from the first pilot check valve 36A is connected to Port A of the outer and inner piston cylinder units 26A and 27A, respectively. On the other hand, Port B of the directional switching valve 34A is connected to the second pilot check valve 37A, and a branch of the hydraulic oil line from the second pilot check valve 37A is connected to Port B of the outer and inner piston cylinder units 26A and 27A, respectively. However, a stop unit 40A is provided in the line from the second pilot check valve 37A to Port B of the inner piston cylinder unit 27A to stop the supply of hydraulic oil. The stop unit 40A will be explained later.

[0060] Both the first and second pilot check valves 36A and 37A act as valves to prevent the backflow of hydraulic oil, but these first and second pilot check valves 36A and 37A mutually release the prohibition of hydraulic oil backflow. Specifically, if hydraulic pressure is applied to the input side through the first pilot check valve 36A, the second pilot check valve 37A is operated, thus releasing the prohibition of hydraulic oil backflow in the second pilot check valve 37A. In other words, backflow of hydraulic oil is permitted. On the other hand, if hydraulic pressure is applied to the input side through the second pilot check valve 37A, the first pilot check valve 36A is operated, thus releasing the prohibition of hydraulic oil backflow in the first pilot check valve 36A. In other words, backflow of hydraulic oil is permitted. The hydraulic oil that flows back through these first and second pilot check valves 36A and 37A returns to the oil tank 39A via the directional switching valve 34A.

[0061] <Stop Unit>

[0062] In the hydraulic supply mechanism 30A, a stop unit 40A is provided on the B port side of the inner piston cylinder unit 27A to stop the supply of hydraulic oil. In this embodiment, the stop unit 40A is composed of a shut-off valve 45A. The shut-off valve 45A is switched by the solenoid b to allow or stop the supply of hydraulic oil. If the supply of hydraulic oil is stopped by the shut-off valve 45A, the supply of hydraulic oil to the B port of the inner piston cylinder unit 27A and the discharge of hydraulic oil from the B port both stop. That is, the inner piston cylinder unit 27A becomes unable to extend or retract.

[0063] <The function of the dual injection molding machine in this embodiment>

[0064] The dual injection molding machine 1 in this embodiment (refer to) Figure 1 In this embodiment, the first and second injection devices 4A and 4B are equipped with the moving devices 25A and 25B of the first embodiment. The first and second injection devices 4A and 4B are driven by the moving devices 25A and 25B of the first embodiment. First, the normal operation method will be described.

[0065] First and second injection devices 4A and 4B (refer to) Figure 1In order to bring the heating cylinders 14A and 14B, screw drive devices 15A and 15B, etc., closer to the fixed plate 6, do so as follows. Figure 3 As shown, in the hydraulic supply mechanism 30A, the shut-off valve 45A is in its normal state (that is, the state that allows the supply of hydraulic oil). Regarding the hydraulic supply mechanism 30B provided in the moving device 25B of the second injection device 4B, although not shown, the shut-off valve 45B is also operated in the same way in this hydraulic supply mechanism 30B. Hereinafter, regarding the hydraulic supply mechanism 30B (not shown), and... Figure 3 The hydraulic supply mechanism 30A shown operates in the same manner; the description of the operation of the hydraulic supply mechanism 30B is omitted.

[0066] The solenoid a is driven in the directional switching valve 34A. In this way, hydraulic oil from the hydraulic source 31A is supplied to port A of the outer and inner piston cylinder units 26A and 27A through the first pilot check valve 36A. Since the ends 41A and 42A of the outer and inner piston cylinder units 26A and 27A are respectively fixed to the fixed plate 6 (see reference...) Figure 1 Therefore, the outer and inner piston cylinder units 26A and 27A are directed towards arrows 47 and 47 (refer to...). Figure 3 Directional drive. That is, heating cylinders 14A, 14B, etc. approach the fixed plate 6. At this time, hydraulic oil is discharged from port B of the outer and inner piston cylinder units 26A and 27A. The discharged hydraulic oil returns to the oil tank 39A through the second pilot check valve 37A and the directional switching valve 34A.

[0067] First and second injection devices 4A and 4B (refer to) Figure 1 In order to separate the heating cylinders 14A and 14B, screw drive devices 15A and 15B, etc. from the fixed plate 6, do the following: Figure 4 As shown, in the hydraulic supply mechanism 30A, the shut-off valve 45A is in its normal state (that is, the state that allows the supply of hydraulic oil). As mentioned earlier, the hydraulic supply mechanism 30B provided in the moving device 25B of the second injection device 4B, although not shown, operates in the same way as the hydraulic supply mechanism 30A.

[0068] The solenoid b is driven in the directional switching valve 34A. Hydraulic oil from the hydraulic source 31A is supplied to the B ports of the outer and inner piston cylinder units 26A and 27A through the first pilot check valve 36A. Since the ends 41A and 42A of the outer and inner piston cylinder units 26A and 27A are respectively fixed to the fixed plate 6 (see reference...) Figure 1 Therefore, the outer and inner piston cylinder units 26A and 27A are directed towards arrows 48 and 48 (refer to...). Figure 4Directional drive. That is, heating cylinders 14A, 14B, etc., leave the fixed plate 6. The hydraulic oil from port A of the outer and inner piston cylinder units 26A and 27A returns to the oil tank 39A.

[0069] During the implementation of the first and second injection devices 4A and 4B (refer to...) Figure 1 In the case of maintenance, the following steps are taken. First, operate the moving devices 25A and 25B of the first embodiment as described above, so that the heating cylinders 14A and 14B, screw drive devices 15A and 15B, etc., are fully disengaged from the fixed plate 6. Next, cut off one end 41A and 41B of the outer piston cylinder units 26A and 26B of each of the first and second injection devices 4A and 4B from the fixed plate 6.

[0070] like Figure 5 As shown, the solenoid b of the shut-off valve 45A in the hydraulic supply mechanism 30A stops the supply of hydraulic oil. The same operation is performed hereinafter for the hydraulic supply mechanism 30B (not shown). That is, although not shown, the hydraulic supply mechanism 30B has a stop unit 40B on the B port side of the inner piston cylinder unit 27B to stop the supply of hydraulic oil. The solenoid a is driven in the directional switching valve 34A. Hydraulic oil from the hydraulic source 31A is supplied to the A port of the outer piston cylinder unit 26A. However, in the inner piston cylinder unit 27A, the flow of hydraulic oil is obstructed by the stop unit 40A, so hydraulic oil is not supplied. One end 41A of the outer piston cylinder unit 26A is diverted from the fixed plate 6 (see reference 6). Figure 1 ) cut off, therefore as Figure 5 As shown, they are driven in the direction of arrow 50. Thus, the outer piston cylinder units 26A and 26B of the first and second injection devices 4A and 4B are shown in the contracted state. Figure 6 .

[0071] At this time, the inner piston cylinder units 27A and 27B are stopped by the stop units 40A and 40B, so the first and second injection devices 4A and 4B do not move. Since the outer piston cylinder units 26A and 26B are retracted, they do not obstruct the maintenance of the first and second injection devices 4A and 4B. The necessary maintenance can then be performed.

[0072] It should be noted that previously, during maintenance, it was also necessary to cut off one end 42A, 42B of the inner piston cylinder units 27A and 27B from the fixed plate 6. However, to do this, it is necessary to... Figure 6As indicated by arrows 53 and 53, it is dangerous for operators to cross the first and second injection units 4A and 4B. Furthermore, it consumes time for the cutting operation. In the dual injection molding machine 1 of this embodiment, which includes the moving devices 25A and 25B of the first embodiment, it is not necessary to cut the inner piston cylinder units 27A and 27B from the fixed plate 6 during maintenance, making it safer and reducing operation time.

[0073] After maintenance is complete, such as Figure 7 As shown, the hydraulic supply mechanism 30A is operated as follows. Although not shown, the hydraulic supply mechanism 30B is operated similarly. First, assuming the solenoid b is driven in the shut-off valve 45A, the supply of hydraulic oil to the inner piston cylinder unit 27A is stopped. The solenoid b of the direction switching valve 34A is driven. Hydraulic oil from the hydraulic source 31A is supplied only to port B of the outer piston cylinder unit 26A via the second pilot check valve 37A. One end 41A of the outer piston cylinder unit 26A is driven as shown by arrow 54. That is, the outer piston cylinder unit 26A extends. Similarly, the second injection device 4B (see reference...) Figure 1 The outer piston cylinder unit 26B is also extended. One end 41A, 41B of each of the outer piston cylinder units 26A and 26B is connected to the fixed plate 6.

[0074] It should be noted that in the above explanation, Figure 2 The hydraulic supply mechanism 30A shown and the hydraulic supply mechanism 30B (not shown) perform the same operation simultaneously. That is, the same operation is performed in the first and second injection devices 4A and 4B. However, since the hydraulic supply mechanisms 30A and 30B are independently provided for the first and second injection devices 4A and 4B, it is also possible to operate only one of them. In other words, when only maintaining the first injection device 4A, only the hydraulic supply mechanism 30A needs to be operated.

[0075] The injection unit is a single injection molding machine.

[0076] Figure 2 The moving device 25A of the first embodiment shown can also be used in an injection molding machine where the injection device is a single unit. Figure 8 The image shows an injection molding machine 1' equipped with one injection unit 4. In this injection molding machine 1', it functions similarly to the dual injection molding machine 1 (see reference 1) provided in this embodiment. Figure 1Devices and components that perform the same function as those in the injection molding machine 1' are labeled with the same reference numerals and their descriptions are omitted. Furthermore, the dual injection unit 1 is equipped with two injection units 4A and 4B. The components located in each unit are labeled with reference numerals consisting of the numbers "A" and "B". However, components that perform the same function in the injection molding machine 1' are labeled with reference numerals and their descriptions are omitted.

[0077] The injection molding machine 1' is equipped with first and second piston cylinder units 26 and 27. These first and second piston cylinder units 26 and 27 are also equipped with... Figure 2 The hydraulic supply mechanism 30A is shown. That is to say, the second piston cylinder unit 27 of the first and second piston cylinder units 26 and 27 is equipped with a stop unit in its hydraulic circuit that prevents the supply of hydraulic oil and thus prevents extension and retraction, thus becoming a piston cylinder unit 27 with a stop unit.

[0078] One end 41, 42 of the first and second piston cylinder units 26, 27 is connected to the fixed plate 6. However, in this embodiment, the other end 43, 44 is connected to the U-shaped clips 29', 29' of the second plate 21 of the support frame 18. That is, the first and second piston cylinder units 26, 27 are more... Figure 1 The pair of piston cylinder units 26A and 27A of the dual injection molding machine 1 shown in this embodiment are short. Therefore, in Figure 8 In the injection molding machine 1' shown, the distance between the injection device 4 and the fixed plate 6 is shorter, so the injection device 4 needs to be rotated during maintenance.

[0079] When maintaining the injection unit 4 in the injection molding machine 1', it is done as follows: First, the pair of piston cylinder units 26, 27 of the moving device 25 are driven to disengage the injection unit 4 from the fixed platen 6. Next, one end 41 of the first piston cylinder unit 26 is cut off from the fixed platen 6. Then, a hydraulic supply mechanism (not shown) is driven to retract the first piston cylinder unit 26. At this time, the second piston cylinder unit 27 is stopped by the stop unit. Figure 9 As shown, the injection device 4 is rotated. At this time, the second piston cylinder unit 27 rotates slightly along with the rotation of the injection device 4 because one end 42 is connected to the fixed plate 6, but this will not cause any obstruction during maintenance.

[0080] After maintenance is completed, the reverse process is performed. That is, the injection device 4 is rotated back to its original state. Then, the first piston cylinder unit 26 is extended, and its end 41 is connected to the fixed platen 6. In this embodiment of the injection molding machine 1', the piston cylinder unit 26 that is cut off from and reconnected to the fixed platen 6 during maintenance can be a single unit, which can shorten the operation time.

[0081] <Mobile device according to the second embodiment>

[0082] The dual injection molding machine 1 of this embodiment (refer to...) Figure 1 The first and second injection devices 4A and 4B are described with different moving devices 25A and 25B respectively. That is, each is provided with a hydraulic supply mechanism 30A (see reference) that has a moving device 25A for moving the first injection device 4A. Figure 2 The hydraulic supply mechanism 30B (not shown) of the moving device 25B that moves the second injection device 4B and the first and second injection devices 4A and 4B can also be provided with, for example, the hydraulic supply mechanism 30B of the moving device 25B that moves the second injection device 4B. In contrast, the first and second injection devices 4A and 4B can also be provided with, for example, the hydraulic supply mechanism 30B of the moving device 25B that moves the second injection device Figure 10 The common single mobile device 25' shown (that is, the mobile device 25' of the second embodiment).

[0083] The mobile device 25' in the second embodiment includes a hydraulic supply mechanism 30'. The hydraulic supply mechanism 30' and... Figure 2 The hydraulic supply mechanism 30A shown also includes a hydraulic source 31, a pressure reducing valve 32, a directional switching valve 34, first and second pilot check valves 36 and 37, and a shut-off valve 45. In this embodiment, hydraulic oil is supplied from the first pilot check valve 36 to the A ports of the two outer piston cylinder units 26A and 26B and the A ports of the two inner piston cylinder units 27A and 27B. Additionally, hydraulic oil is directly supplied from the second pilot check valve 37 to the B ports of the two outer piston cylinder units 26A and 26B, and hydraulic oil is supplied to the B ports of the two inner piston cylinder units 27A and 27B via the shut-off valve 45.

[0084] In the moving device 25' of this embodiment, the two inner piston cylinder units 27A and 27B are piston cylinders with stop unit piston cylinders, which are enabled or stopped by the shut-off valve 45, which serves as the stop unit 40. Therefore, the dual injection molding machine 1 of this embodiment (see reference 1) functions differently from the moving devices 25A and 25B provided in the first and second injection devices 4A and 4B, respectively. Figure 1 It serves the same purpose and is easy to maintain.

[0085] <Mobile device according to the third embodiment>

[0086] Figure 2 The hydraulic supply mechanism 30A of the first embodiment shown can, as Figure 11 The deformation is as shown. Figure 11 In the third-party hydraulic supply mechanism 30A' shown, the stop unit 40A' is located on the A-port side of the inner piston cylinder unit 27A and consists only of the electromagnetic on / off valve 57A. This embodiment also serves the same function as the hydraulic supply mechanism 30A in the first embodiment.

[0087] While the invention described above is based on specific embodiments, it is not limited to the described embodiments, and various modifications can be made without departing from its spirit. The examples described above can also be appropriately combined and implemented.

Claims

1. An injection device comprising: Heating cylinder; The screw is disposed inside the heating cylinder; and A pair of piston-cylinder units are arranged on both sides of the heating cylinder. One end of each of the pair of piston cylinder units is connected to the mold clamping device. The pair of piston cylinder units are arranged such that the heating cylinder and the screw are driven integrally in a direction relative to the mold clamping device by extending or retracting the pair of piston cylinder units. One of the pair of piston cylinder units is configured as a piston cylinder unit with a stop unit, wherein the piston cylinder unit with the stop unit is provided with a stop unit that prevents extension and retraction.

2. The injection device according to claim 1, The stopping unit is composed of a valve installed in the hydraulic circuit of the piston cylinder unit with the stopping unit.

3. The injection device according to claim 2, The valve is composed of a shut-off valve.

4. The injection device according to any one of claims 1 to 3, The other end of each of the pair of piston cylinder units is connected to a component of the screw drive device that drives the screw. The pair of piston cylinder units are arranged such that the screw drive device, together with the heating cylinder and the screw, is driven in a direction that approaches or moves away from the mold clamping device by extending or retracting the pair of piston cylinder units.

5. An injection molding machine, comprising: The mold closing device closes the mold; and The injection device injects the injection material into the mold. in, The injection device comprises: Heating cylinder; The screw is disposed inside the heating cylinder; and A pair of piston-cylinder units are arranged on both sides of the heating cylinder. One end of each of the pair of piston cylinder units is connected to the mold clamping device, and the pair of piston cylinder units are arranged such that the heating cylinder and the screw are integrally driven in the direction of the mold clamping device or the opposite direction by extending and retracting the pair of piston cylinder units. One of the pair of piston cylinder units is configured as a piston cylinder unit with a stop unit, wherein the piston cylinder unit with the stop unit is provided with a stop unit that prevents extension and retraction.

6. The injection molding machine according to claim 5, It is an injection molding machine equipped with the aforementioned mold clamping device and two aforementioned injection devices. The two injection units are symmetrically arranged with respect to the mechanical centerline of the mold clamping device. The piston cylinder unit with a stop unit in each of the two injection devices is a piston cylinder unit located close to the mechanical centerline.

7. The injection molding machine according to claim 5 or 6, The stopping unit is composed of a valve installed in the hydraulic circuit of the piston cylinder unit with the stopping unit.

8. The injection molding machine according to claim 7, The valve is composed of a shut-off valve.

9. The injection molding machine according to claim 5 or 6, The other end of each of the pair of piston cylinder units is connected to a component of the screw drive device that drives the screw. The pair of piston cylinder units are arranged such that the screw drive device, together with the heating cylinder and the screw, is driven in a direction that approaches or moves away from the mold clamping device by extending or retracting the pair of piston cylinder units.

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