Vertical injection molding machine

Abstract

To provide a vertical injection molding machine that can control the increase in height dimension, a heating cylinder replacement jig that can be worked manually and can control damage to the heating cylinder, and a heating cylinder replacement method using the heating cylinder replacement jig.SOLUTION: In the vertical injection molding machine 1, the upper limit position Pm of the heating cylinder holding plate 13 during normal operation is set so that the screw holding plate 14 does not collide with the connecting bracket 15b even when the heating cylinder holding plate 13 moves upward when the heating cylinder holding plate 13 and the screw holding plate 14 are separated by the maximum separation distance Dm during normal operation. The vertical injection molding machine 1 has two modes: a normal operation mode in which the heating-tube holding plate 13 is restricted from moving above the upper limit position Pm during normal operation, and a heating-tube replacement mode in which the heating-tube holding plate 13 is allowed to move above the upper limit position Pm during normal operation.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a vertical injection molding machine, a heater barrel replacement jig, and a heater barrel replacement method for a vertical injection molding machine. [Background technology]

[0002] In a vertical injection molding machine, a heater barrel is attached so as to be suspended from a heater barrel holding plate of an injection unit. Techniques related to replacement of a heater barrel of such a vertical injection molding machine are disclosed in Patent Documents 1 and 2.

[0003] In the vertical injection molding machine disclosed in Patent Document 1, the heater barrel is replaced using a heater barrel replacement jig. The heater barrel replacement jig has a slider body, a slider plate slidably provided on the slider body, and a cylindrical heater barrel insertion and holding part fixed to the upper surface of the slider plate. When removing the heater barrel, the worker places the slider body of the heater barrel replacement jig on the upper surface of the movable die plate, moves the heater barrel holding plate downward, and inserts the tip of the heater barrel into the heater barrel insertion and holding part. Then, the worker removes the heater barrel from the heater barrel holding plate, slides the slider plate relative to the slider body, and transports the heater barrel held in the heater barrel insertion and holding part to a predetermined position on the side of the vertical injection molding machine.

[0004] The vertical injection molding machine disclosed in Patent Document 2 is provided with a connecting means having a pivot point on the plasticizing unit mounting plate, and is configured so that the plasticizing unit (corresponding to a heating barrel) can be attached and detached by rotating it around the pivot point. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-153110 A [Patent Document 2] Japanese Patent Application Publication No. 4-208427 Summary of the Invention [Problem to be solved by the invention]

[0006] In the vertical injection molding machine of Patent Document 1, the heater barrel holding plate is provided so as to be movable in the vertical direction by a ball screw mechanism. The vertical injection molding machine has a screw holding plate (linear plate) to which a screw is attached. The screw holding plate is disposed above the heater barrel holding plate and is provided so as to be movable in the vertical direction relative to the heater barrel holding plate. A connecting bracket for connecting the ball screw shaft is disposed above the heater barrel holding plate. In the vertical injection molding machine, the upper limit position of the heater barrel holding plate is set so that the screw holding plate does not collide with the connecting bracket even when the heater barrel holding plate moves upward when the heater barrel holding plate and the screw holding plate are separated by the maximum distance that can be achieved in normal operation (maximum separation distance during normal operation). Therefore, if the heater barrel holding plate is made movable to a higher position for replacing the heater barrel, the connecting bracket must also be disposed at a higher position to avoid collision, which increases the height dimension of the vertical injection molding machine. Furthermore, when the heating barrel holding plate is moved downward during replacement of the heating barrel, the tip of the heating barrel may collide with the heating barrel insertion and holding portion, possibly damaging the heating barrel.

[0007] In the vertical injection molding machine of Patent Document 2, when the plasticizing unit is attached, the plasticizing unit is manually positioned in the vertical direction. However, if the plasticizing unit also becomes larger along with the size of the vertical injection molding machine, manual work becomes very difficult.

[0008] Therefore, the present invention aims to provide a vertical injection molding machine that can prevent the vertical dimension from increasing, a heater barrel replacement jig that can be operated by hand and prevents damage to the heater barrel, and a heater barrel replacement method using the heater barrel replacement jig. [Means for solving the problem]

[0009] In order to achieve the above object, a vertical injection molding machine according to one aspect of the present invention has a heater barrel with a tip facing downward, a screw housed in the heater barrel, a heater barrel holding plate to which the heater barrel is attached, a screw holding plate arranged above the heater barrel holding plate and to which the screw is attached, an injection device driving unit that moves the heater barrel holding plate in a vertical direction, a screw driving unit that moves the screw holding plate in a vertical direction relative to the heater barrel holding plate, and a control device that controls the injection device driving unit and the screw driving unit. The present invention is characterized in that an upper limit position of the heater barrel holding plate during normal operation is set so that the screw holding plate will not collide with components of the vertical injection molding machine even when the heater barrel holding plate moves upward when the heater barrel holding plate and the screw holding plate are separated by the maximum separation distance during normal operation, and the control device has a normal operation mode that restricts the heater barrel holding plate from moving upward beyond the upper limit position during normal operation, and a heater barrel replacement mode that allows the heater barrel holding plate to move upward beyond the upper limit position during normal operation.

[0010] In order to achieve the above-mentioned object, another aspect of the present invention provides a heater barrel replacement jig used when replacing a heater barrel of a vertical injection molding machine, and comprises a frame arranged below the heater barrel holding plate of the vertical injection molding machine, a slider attached to the heater barrel and configured to be able to slide along a moving lane provided horizontally on the frame, and a lifting member for moving the heater barrel in an up and down direction, wherein the lifting member has a shaft attached to the frame by a screw structure and a table attached to the upper end of the shaft, and is configured so that the table moves in an up and down direction by rotating the shaft around its axis. It is preferable that the slider has a plurality of wheels for running on the moving lane, and the frame has a guide post disposed between the plurality of wheels for guiding the upward and downward movement of the slider. It is preferable that the slider is attached to a central portion of the heating barrel in the vertical direction or to a portion above the central portion.

[0011] In order to achieve the above object, a heater barrel replacement method according to another aspect of the present invention is a heater barrel replacement method for replacing the heater barrel using a heater barrel replacement tool in a vertical injection molding machine having a heater barrel with a tip facing downward, a screw housed in the heater barrel, a heater barrel holding plate to which the heater barrel is attached, a screw holding plate arranged above the heater barrel holding plate and to which the screw is attached, an injection device drive unit that moves the heater barrel holding plate in an up and down direction, a screw drive unit that moves the screw holding plate in an up and down direction relative to the heater barrel holding plate, and a control device that controls the injection device drive unit and the screw drive unit, wherein an upper limit position of the heater barrel holding plate during normal operation is set so that the screw holding plate does not collide with a component of the vertical injection molding machine even when the heater barrel holding plate moves upward when the heater barrel holding plate and the screw holding plate are separated by a maximum separation distance during normal operation, and the control device controls the heater barrel holding plate to be moved upward from the upper limit position during normal operation. and a heater barrel replacement mode in which the heater barrel holding plate is permitted to move above an upper limit position during the normal operation. The heater barrel replacement jig has a frame, a slider configured to be slidable on a moving lane horizontally provided on the frame, and a lifting member for moving the heater barrel in a vertical direction. The lifting member has a shaft attached to the frame by a screw structure and a table attached to an upper end of the shaft, and is rotated around an axis to perform a heater barrel replacement. the control device is switched to the heater barrel replacement mode, the heater barrel holding plate and the screw holding plate are brought closer to each other than the maximum separation distance during normal operation, the heater barrel holding plate is moved upward from the upper limit position during normal operation, the frame is disposed below the heater barrel holding plate of the vertical injection molding machine, the slider is attached to the heater barrel, the shaft of the lifting member is rotated around its axis, and the table is moved upward until it abuts against the tip of the heater barrel,The heating cylinder is removed from the heating cylinder holding plate and placed on the table, the shaft of the lifting member is rotated about its axis to move the table downward until the slider is placed on the moving lane, and the slider is slid on the moving lane to move the heating cylinder together with the slider in the horizontal direction. Effect of the Invention

[0012] The vertical injection molding machine according to the present invention has a normal operation mode that restricts the heater barrel holding plate from moving upward from its upper limit position during normal operation, and a heater barrel replacement mode that allows the heater barrel holding plate to move upward from its upper limit position during normal operation. As a result, when performing normal operations such as molding operations, the normal operation mode can be switched to to avoid collision between the screw holding plate and components of the vertical injection molding machine. When replacing the heater barrel, the heater barrel replacement mode can be switched to to move the heater barrel holding plate upward from its upper limit position during normal operation while paying attention to collision of the screw holding plate. This makes it possible to prevent the vertical injection molding machine from becoming larger in height.

[0013] The heating barrel replacement jig according to the present invention includes a frame disposed below the heating barrel holding plate, a slider attached to the heating barrel and configured to be slidable on a moving lane horizontally provided on the frame, and a lifting member for moving the heating barrel in the vertical direction. The lifting member includes a shaft attached to the frame by a screw structure and a table attached to the upper end of the shaft, and is configured to move the table in the vertical direction by rotating the shaft around its axis. In this way, the heating barrel placed on the table can be manually moved in the vertical direction by attaching a handle or the like to the shaft of the lifting member and rotating it. Also, the slider allows the heating barrel to be easily moved horizontally.

[0014] In addition, the heater barrel replacement method according to the present invention includes the steps of: an operator switches a vertical injection molding machine to a heater barrel replacement mode, brings the heater barrel holding plate and the screw holding plate closer than the maximum separation distance during normal operation, and moves the heater barrel holding plate above its upper limit position during normal operation; disposing a frame below the heater barrel holding plate of the vertical injection molding machine; attaching a slider to the heater barrel; rotating the shaft of the lifting member about its axis to move the table upward until it abuts against the tip of the heater barrel; removing the heater barrel from the heater barrel holding plate and placing it on the table; rotating the shaft of the lifting member about its axis to move the table downward until the slider is placed on the moving lane; sliding the slider on the moving lane to move the heater barrel together with the slider in the horizontal direction; and, as a result, the heater barrel can be easily replaced manually. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a front view of a vertical injection molding machine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating functional blocks of the vertical injection molding machine of FIG. [Diagram 3] 2 is a perspective view of a heater barrel replacement jig used for replacing the heater barrel of the vertical injection molding machine of FIG. 1. FIG. [Figure 4] FIG. 4 is a front view of the heater barrel replacement jig of FIG. [Diagram 5] FIG. 4 is a right side view of the heating barrel replacement jig of FIG. [Figure 6] 1 (a state in which the heater barrel holding plate and the screw holding plate have been moved to their respective retreat limit positions in the normal operation mode). FIG. [Figure 7] FIG. 2 is a diagram for explaining a method for replacing the heater barrel of the vertical injection molding machine of FIG. 1 (the heater barrel holding plate and the screw holding plate are brought closer to each other than the maximum separation distance during normal operation, and the heater barrel holding plate is moved above the upper limit position during normal operation). [Figure 8]1 (a state in which a frame of a heater barrel replacement jig is disposed on the upper surface of the movable die plate). FIG. [Figure 9] 1 (a state in which a lifting member is attached to the frame of the heater barrel replacement jig and a slider is attached to the heater barrel). FIG. [Figure 10] 1 (a state in which the table of the lifting member is in contact with the tip of the heating barrel). FIG. [Figure 11] 1 (a state in which the slider attached to the heater barrel is slid from rear to front). FIG. [Figure 12] 1 (a state in which the replaced heating barrel is attached to the heating barrel holding plate). FIG. [Figure 13] FIG. 2 is a diagram for explaining a method for replacing the heater barrel of the vertical injection molding machine of FIG. 1 (after the replaced heater barrel is attached to the heater barrel holding plate, the heater barrel holding plate and the screw holding plate are moved to the rearmost position in the normal operation mode). [Figure 14] 1 (a state in which a screw is inserted into the replaced heater barrel). FIG. [Figure 15] 1 (a state in which the screw inserted in the replaced heater barrel has been moved upward). FIG. [Figure 16] 1 (a state in which the screw inserted in the replaced heater barrel is attached to the screw holding plate). FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a vertical injection molding machine according to one embodiment of the present invention will be described mainly with reference to FIGS.

[0017] As shown in Fig. 1, the vertical injection molding machine 1 has an injection unit 10, a clamping unit 20, and a display operation unit 30 on a base 5. In addition, as shown in Fig. 2, the vertical injection molding machine 1 has a control unit 40.

[0018] The injection device 10 injects and fills a cavity formed by the upper mold 2 and the lower mold 3 with resin. The injection device 10 has a heating barrel 11 and a screw 12. The heating barrel 11 has a nozzle 11a facing downward at its tip. The screw 12 is housed within the heating barrel 11.

[0019] The clamping device 20 opens and closes the upper mold 2 and the lower mold 3, and generates a clamping force to clamp the upper mold 2 and the lower mold 3 in a closed state. The clamping device 20 has a movable die plate 21 and a rotary table 22. The movable die plate 21 has a flat plate shape, and the upper mold 2 is attached to a lower surface 21a. The rotary table 22 has the lower mold 3 attached to an upper surface 22a. The rotary table 22 has a plurality of lower molds 3 attached thereto, and by rotating, transports the plurality of lower molds 3 sequentially to a position facing the upper mold 2. When the upper mold 2 and the lower mold 3 are clamped by the clamping device 20, a cavity is formed.

[0020] The heating cylinder 11 is disposed above the movable die plate 21. A through hole 21b is provided in the center of the movable die plate 21. The through hole 21b penetrates from the lower surface 21a to the upper surface 21c of the movable die plate 21. The upper part of the through hole 21b is formed in a mortar shape. A nozzle 11a is inserted into the through hole 21b from the upper surface 21c side. The injection device 10 injects molten resin into the cavity with the nozzle 11a in contact with the upper die 2.

[0021] As shown in FIG. 6, the injection device 10 has a heater barrel holding plate 13 and a screw holding plate 14. FIG. 6 shows the injection device 10 with the cover removed. The heater barrel holding plate 13 holds the heater barrel 11 so that the nozzle 11a faces downward and is aligned in the vertical direction. The base end of the heater barrel 11 is attached to the heater barrel holding plate 13. The heater barrel holding plate 13 is disposed above the base bracket 23 of the mold clamping device 20 so as to be movable in the vertical direction. The screw holding plate 14 holds the screw 12 rotatably. The base end of the screw 12 is attached to the screw holding plate 14. The screw holding plate 14 is disposed above the heater barrel holding plate 13 so as to be movable in the vertical direction.

[0022] The injection device 10 has an injection device drive unit 15 and a screw drive unit 16 .

[0023] The injection device drive unit 15 moves the heating barrel holding plate 13 in the up-down direction. The injection device drive unit 15 has a ball screw mechanism 15a and an electric motor for moving the injection device (not shown). The ball screw mechanism 15a has a ball screw shaft 15a1 and a nut body 15a2. The ball screw shaft 15a1 is arranged so as to extend upward from the base bracket 23. Three ball screw shafts 15a1 are provided. The upper ends of the ball screw shafts 15a1 are connected by a connecting bracket 15b. The connecting bracket 15b is arranged above the screw holding plate 14. The nut body 15a2 is attached to the heating barrel holding plate 13. When the nut body 15a2 is rotated by the electric motor for moving the injection device, it moves in the up-down direction along the ball screw shaft 15a1. Three nut bodies 15a2 are provided corresponding to the respective ball screw shafts 15a1.

[0024] The screw driving unit 16 rotates the screw 12 and moves the screw 12 in the vertical direction. The screw driving unit 16 has a rotating member 16a, a ball screw mechanism (not shown), an electric motor for rotating the screw (not shown), and an electric motor for moving the screw (not shown). The rotating member 16a is configured to rotate integrally with the screw 12. When the rotating member 16a is rotated by the electric motor for rotating the screw, the screw 12 rotates around its axis. The ball screw mechanism of the screw driving unit 16 is driven by the electric motor for moving the screw, and moves the screw holding plate 14, to which the screw 12 is attached, in the vertical direction relative to the heating barrel holding plate 13.

[0025] The display operation device 30 has a display unit 31 that displays information related to the vertical injection molding machine 1, and an operation unit 32 for inputting operations. The display unit 31 and the operation unit 32 are connected to the control device 40. The display unit 31 displays various screens in the display area based on control signals from the control device 40. The operation unit 32 has a plurality of keys, and transmits signals corresponding to operations input to each key to the control device 40. The display operation device 30 may have a touch panel superimposed on the display unit 31 as the operation unit 32, and may have a software switch configured by combining the icons displayed on the display unit 31 with the touch panel.

[0026] The control device 40 is composed of a microcomputer and controls the overall operation of the vertical injection molding machine 1. The control device 40 has a memory for storing programs and data. The control device 40 controls the operation of each device such as the injection device 10 and the mold clamping device 20. As shown in Fig. 2, the control device 40 is connected to the injection device 10 (injection device drive unit 15, screw drive unit 16), the mold clamping device 20, and the display operation device 30 (display unit 31, operation unit 32).

[0027] The memory of the control device 40 stores the maximum distance that the heating barrel holding plate 13 and the screw holding plate 14 can be separated from each other during normal operation (hereinafter referred to as the "maximum separation distance Dm during normal operation"). .Ma In addition, the memory of the control device 40 stores an upper limit position of the heating barrel holding plate 13 (hereinafter referred to as "upper limit position Pm during normal operation") at which the screw holding plate 14 does not collide with a component of the vertical injection molding machine 1 (specifically, the connecting bracket 15b) even when the heating barrel holding plate 13 moves upward when the heating barrel holding plate 13 and the screw holding plate 14 are separated by the maximum separation distance Dm during normal operation. The upper limit position Pm during normal operation is the rearmost position of the heating barrel holding plate 13 during normal operation. In normal operation, when the heater barrel holding plate 13 is in the upper limit position Pm during normal operation and the heater barrel holding plate 13 and the screw holding plate 14 are separated by the maximum separation distance Dm during normal operation, the screw holding plate 14 is in the retracted limit position. The normal operation refers to the molding operation of the vertical injection molding machine 1 and operations that are executed in relation to the molding operation.

[0028] The control device 40 has a normal operation mode and a heater barrel replacement mode. In the normal operation mode, the control device 40 restricts the heater barrel holding plate 13 from moving upward from the upper limit position Pm during normal operation. In the normal operation mode, the control device 40 executes normal operations such as a molding operation for injection molding a molded product and a purging operation for discharging the resin in the heater barrel 11. In the heater barrel replacement mode, the control device 40 allows the heater barrel holding plate 13 to move upward from the upper limit position Pm during normal operation. In the heater barrel replacement mode, the control device 40 executes operations required for replacing the heater barrel 11.

[0029] The control device 40 executes a molding operation in the normal operation mode. In the molding operation, the control device 40 controls the clamping device 20 to clamp the upper mold 2 and the lower mold 3. The control device 40 controls the injection device driving unit 15 to touch the nozzle 11a of the heating cylinder 11 to the upper mold 2. The control device 40 controls the screw driving unit 16 to rotate the screw 12 and move it upward together with the screw holding plate 14 to plasticize and measure the resin. The control device 40 controls the screw driving unit 16 to move the screw 12 downward together with the screw holding plate 14 to inject and fill the resin into the cavity. The control device 40 controls the clamping device 20 to open the upper mold 2 and the lower mold 3 to remove the molded product from the cavity.

[0030] In the heating barrel replacement mode, the control device 40 controls the injection device drive unit 15 and the screw drive unit 16 to bring the heating barrel holding plate 13 and the screw holding plate 14 closer than the maximum separation distance Dm during normal operation, and moves the heating barrel holding plate 13 above the upper limit position Pm during normal operation. Specifically, the control device 40 controls the injection device drive unit 15 and the screw drive unit 16 to bring the heating barrel holding plate 13 and the screw holding plate 14 closer to the minimum distance required for the replacement work of the heating barrel 11 (hereinafter referred to as the "heating barrel replacement distance Dn"), and moves the heating barrel holding plate 13 to the highest position (hereinafter referred to as the "heating barrel replacement upper limit position Pn") where the screw holding plate 14 does not collide with the connecting bracket 15b. The heating barrel replacement distance Dn is smaller than the maximum separation distance Dm during normal operation. The heating barrel replacement upper limit position Pn is higher than the upper limit position Pm during normal operation. The distance Dn during replacement of the heating barrel may be a mechanical limit distance between the heating barrel holding plate 13 and the screw holding plate 14.

[0031] Next, a heater barrel replacement jig 100 used when replacing the heater barrel 11 of the vertical injection molding machine 1 will be described with reference mainly to FIGS.

[0032] The heating barrel replacement jig 100 has a frame 110, a slider 120, and a lifting member 130. The lifting member 130 is shown in FIG.

[0033] The frame 110 is disposed on the upper surface 21c of the movable die plate 21 and fixed to the movable die plate 21 with bolts. The frame 110 has a rectangular parallelepiped frame body 111 and has a movement lane 112 extending horizontally above the frame body 111. The frame 110 also has guide posts 113 extending upward from the frame body 111. The guide posts 113 are disposed along the up-down direction. The guide posts 113 are detachable from the frame body 111.

[0034] The slider 120 is attached to the heating cylinder 11. The slider 120 has a slider body 121, wheels 123, and a handle 124. The slider body 121 has a flat plate shape, and is provided with a heating cylinder holding hole 122 in which the heating cylinder 11 is placed. The diameter of the heating cylinder holding hole 122 is the same as the outer diameter of the heating cylinder 11. A fitting protrusion 122b is provided on the inner surface of the heating cylinder holding hole 122. The fitting protrusion 122b fits into a fitting hole 11b provided on the outer peripheral surface of the heating cylinder 11. The fitting hole 11b is provided at the center of the heating cylinder 11 in the vertical direction or at a position above the center. In other words, the slider 120 is attached to the center of the heating cylinder 11 in the vertical direction or at a position above the center. If the heating barrel 11 can be held without falling out of the heating barrel holding hole 122, the heating barrel replacement jig 100 and the heating barrel 11 may adopt a configuration in which the fitting protrusion 122b and the fitting hole 11b are omitted. Four wheels 123 are provided and are rotatably attached to the front, rear, left and right locations of the slider body 121. As shown by the dotted line in FIG. 5, a guide post 113 is arranged between two wheels 123 arranged in the front-rear direction. The guide post 113 contacts the wheels 123 to guide the vertical movement of the slider 120. The slider body 121 is slid in the front-rear direction by traveling on the moving lane 112 by the wheels 123. The slider body 121 has a shape that is symmetrical on the left and right, and is configured to be separable into a left part 121A and a right part 121B. A handle 124 is attached to the front of the slider body 121.

[0035] The lifting member 130 moves the heating cylinder 11 in the up-down direction. As shown in FIG. 10 and other figures, the lifting member 130 has a shaft 131 and a table 132. The shaft 131 is attached to the frame 110 by a screw structure. Specifically, the shaft 131 is screwed into a nut member 114 of the frame 110. A handle 133 for rotating the shaft 131 about its axis is attached to the lower end of the shaft 131. The table 132 is attached to the upper end of the shaft 131 so as to be rotatable relative to the shaft 131. The lifting member 130 is configured such that the table 132 moves in the up-down direction by turning the handle 133 to rotate the shaft 131 about its axis.

[0036] Next, an example of a method for replacing the heater barrel 11 using the heater barrel replacement jig 100 in the above-mentioned vertical injection molding machine 1 will be described with reference to Figs. 6 to 16. Figs. 6 to 11, 12(a), 13, 14(a), 15, and 16 are views of the part above the movable die plate 21 in the vertical injection molding machine 1 as viewed from the right side. Figs. 12(b) and 14(b) are views of the heater barrel 11 as viewed from below. For the sake of convenience in the description, some members are shown in cross-section or omitted from the drawings in Figs. 6 to 16.

[0037] The removal of the heating barrel 11 will now be described.

[0038] The operator operates the operating unit 32, and controls the injection device driver 15 and the screw driver 16 by the control device 40 in the normal operation mode, to separate the heating barrel holding plate 13 and the screw holding plate 14 by the maximum separation distance Dm during normal operation, and move the heating barrel holding plate 13 to the upper limit position Pm during normal operation, as shown in FIG. 6. At this time, the heating barrel holding plate 13 and the screw holding plate 14 are in the retreat limit position during normal operation. The operator removes the cover of the injection device 10 to expose the heating barrel holding plate 13 and the screw holding plate 14. The operator removes the cover 24 of the base bracket 23 to expose the tip of the heating barrel 11. The operator removes the nozzle 11a from the heating barrel 11. The operator removes the screw 12 from the screw holding plate 14 and pulls out the screw 12 from the tip of the heating barrel 11.

[0039] Next, the operator operates the operation unit 32 to switch from the normal operation mode to the barrel replacement mode. Then, the control device 40 controls the injection device drive unit 15 and the screw drive unit 16 to bring the barrel holding plate 13 and the screw holding plate 14 closer to the barrel replacement distance Dn, and move the barrel holding plate 13 to the barrel replacement upper limit position Pn, as shown in Fig. 7. Then, the operator turns off the power to the vertical injection molding machine 1.

[0040] 8, the worker places the frame 110 of the heating barrel replacement jig 100 on the upper surface 21c of the movable die plate 21 and fixes the frame 110 to the movable die plate 21 with bolts. At this time, the central axis of the nut member 114 of the frame 110 and the central axis of the heating barrel 11 are aligned.

[0041] Next, the worker attaches the slider 120 to the heating cylinder 11 as shown in FIG. 9. Specifically, the heating cylinder 11 is sandwiched between the left part 121A and the right part 121B so that the heating cylinder 11 is disposed inside the heating cylinder holding hole 122, and the left part 121A and the right part 121B are joined with a bolt and a nut. At this time, the fitting protrusion 122b provided on the inner peripheral surface of the heating cylinder holding hole 122 is fitted into the fitting hole 11b provided on the outer peripheral surface of the heating cylinder 11. This allows the slider 120 to be attached to the heating cylinder 11. In addition, the worker attaches the lifting member 130 to the frame 110. Specifically, the worker screws the shaft 131 into the nut member 114 of the frame 110, and attaches the table 132 to the upper end of the shaft 131.

[0042] 10, the worker attaches the handle 133 to the lower end of the shaft 131. Then, the worker rotates the handle 133 to rotate the shaft 131 about its axis, and moves the table 132 upward until it abuts against the lower end of the heating barrel 11.

[0043] Next, the worker removes the heating cylinder 11 from the heating cylinder holding plate 13 and places the heating cylinder 11 on the table 132. The worker rotates the shaft 131 around its axis by rotating the handle 133, and moves the table 132 downward until the slider 120 is placed on the moving lane 112 of the frame 110, as shown in FIG. 11. At this time, a guide post 113 is disposed between the wheels 123 arranged in the front-rear direction of the slider 120, and the guide post 113 guides the downward movement of the slider 120. The worker moves the heating cylinder 11 forward together with the slider 120 by pulling the handle 124 of the slider 120 forward. The worker attaches an eye bolt 150 to the base end of the heating cylinder 11 that has moved forward, and uses a crane (not shown) to carry out the heating cylinder 11.

[0044] The installation of the heating barrel 11 will now be described.

[0045] The worker uses a crane (not shown) to carry the heating cylinder 11 to which the slider 120 is attached so that the slider 120 is placed on the moving lane 112 of the frame 110. The worker pushes the handle 124 of the slider 120 backward to move the heating cylinder 11 backward together with the slider 120. At this time, the central axis of the nut member 114 of the frame 110 and the central axis of the heating cylinder 11 are aligned. The worker rotates the handle 133 to rotate the shaft 131 around its axis, and moves the table 132 upward until it abuts on the tip of the heating cylinder 11. The worker further rotates the handle 133, and moves the table 132 upward until the base end of the heating cylinder 11 reaches the mounting position of the heating cylinder holding plate 13. At this time, a guide post 113 is arranged between the wheels 123 arranged in the front-rear direction of the slider 120, and the guide post 113 guides the upward movement of the slider 120. 12, the worker attaches the base end of the heating barrel 11 to the heating barrel holding plate 13. The worker also attaches a screw drop prevention jig 140 to the tip end of the heating barrel 11. The screw drop prevention jig 140 has a band plate shape, with a bolt hole provided at one end and a notch 140a provided at the other end for hanging on a bolt. The screw drop prevention jig 140 is attached to the heating barrel 11 so as to be rotatable around the bolt hole.

[0046] Next, the worker removes the lifting member 130 from the frame 110. The worker turns on the power of the vertical injection molding machine 1. The worker operates the operation unit 32 to switch from the heating barrel replacement mode to the normal operation mode, and controls the injection device driving unit 15 and the screw driving unit 16 by the control device 40 to separate the heating barrel holding plate 13 and the screw holding plate 14 by the maximum separation distance Dm during normal operation, and moves the heating barrel holding plate 13 to the upper limit position Pm during normal operation, as shown in FIG.

[0047] 14, the worker inserts the screw 12 from the tip of the heating barrel 11. The worker rotates the screw drop prevention jig 140 to hook the notch 140a onto the bolt. This makes it possible to prevent the screw 12 from dropping.

[0048] Next, as shown in FIG. 15, the worker inserts the columnar screw lifting jig 134 into the tip of the heating barrel 11 through the jig insertion hole 140b of the screw drop prevention jig 140, and attaches the lifting member 130 to the frame 110.

[0049] Next, as shown in FIG. 16, the operator rotates the handle 133 to rotate the shaft 131 around its axis, and moves the screw lifting jig 134 together with the table 132 upward until the base end of the screw 12 reaches the mounting position of the screw holding plate 14. The operator attaches the base end of the screw 12 to the screw holding plate 14. The operator removes the frame 110 from the movable die plate 21. The operator removes the screw drop prevention jig 140 from the tip of the heating barrel 11, and attaches the nozzle 11a to the tip of the heating barrel 11. The operator attaches the cover 24 of the base bracket 23 to cover the tip of the heating barrel 11. Then, the operator attaches the cover of the injection device 10 to cover the heating barrel holding plate 13 and the screw holding plate 14. In this manner, the heating barrel 11 is replaced in the vertical injection molding machine 1.

[0050] As described above, the vertical injection molding machine 1 includes the heating barrel 11 with its tip facing downward, the screw 12 housed in the heating barrel 11, the heating barrel holding plate 13 to which the heating barrel 11 is attached, the screw holding plate 14 arranged above the heating barrel holding plate 13 and to which the screw 12 is attached, the injection device drive unit 15 for vertically moving the heating barrel holding plate 13, the screw drive unit 16 for vertically moving the screw holding plate 14 relative to the heating barrel holding plate 13, and the control device 40 for controlling the injection device drive unit 15 and the screw drive unit 16. In the vertical injection molding machine 1, the upper limit position Pm during normal operation of the heating barrel holding plate 13 is set so that the screw holding plate 14 does not collide with the connecting bracket 15b even when the heating barrel holding plate 13 moves upward when the heating barrel holding plate 13 and the screw holding plate 14 are separated by the maximum separation distance Dm during normal operation. The control device 40 has a normal operation mode that restricts the heater barrel holding plate 13 from moving upward from the upper limit position Pm during normal operation, and a heater barrel replacement mode that allows the heater barrel holding plate 13 to move upward from the upper limit position Pm during normal operation. By doing so, when performing a normal operation such as a molding operation, the normal operation mode can be switched to to avoid a collision between the screw holding plate 14 and the connecting bracket 15b. When replacing the heater barrel 11, the heater barrel replacement mode can be switched to to move the heater barrel holding plate 13 upward from the upper limit position Pm during normal operation while paying attention to the collision of the screw holding plate 14. Therefore, the vertical injection molding machine 1 can be prevented from becoming large in height.

[0051] Furthermore, in the barrel replacement mode, the control device 40 controls the injection device driver 15 and the screw driver 16 to bring the barrel holding plate 13 and the screw holding plate 14 closer than the maximum separation distance Dm during normal operation and to move the barrel holding plate 13 upward from the upper limit position Pm during normal operation. In this way, it is possible to prevent the screw holding plate 14 from moving upward when the barrel holding plate 13 is moved upward during replacement of the barrel 11. Therefore, it is possible to prevent the vertical injection molding machine 1 from becoming larger in height.

[0052] The heating barrel replacement jig 100 includes a frame 110 disposed below the heating barrel holding plate 13 of the vertical injection molding machine 1, a slider 120 attached to the heating barrel 11 and configured to be slidable on a moving lane 112 horizontally provided on the frame 110, and a lifting member 130 for moving the heating barrel 11 in the vertical direction. The lifting member 130 includes a shaft 131 attached to the frame 110 by a screw structure and a table 132 attached to the upper end of the shaft 131. The lifting member 130 is configured to rotate the shaft 131 around its axis, thereby moving the table 132 in the vertical direction. As a result, the heating barrel 11 placed on the table 132 can be manually moved in the vertical direction by attaching a handle 133 to the shaft 131 of the lifting member 130 and rotating it. The slider 120 can also easily move the heating barrel 11 in the horizontal direction. Note that the shaft 131 may be rotated using a hand-held electric drill instead of the handle 133. By rotating the shaft 131 with the handle 133 or a hand-held electric drill, the worker can sensitively feel the change in the rotation load when the heating barrel 11 collides with some member, and can immediately stop the rotation of the shaft 131. Therefore, damage to the heating barrel 11 can be suppressed.

[0053] Moreover, the slider 120 has a plurality of wheels 123 for traveling on the moving lane 112. The frame 110 is disposed between the plurality of wheels 123 and has guide posts 113 for guiding the vertical movement of the slider 120. In this way, it is possible to prevent the heating barrel 11 from tilting when the heating barrel 11 moves in the vertical direction.

[0054] In addition, the slider 120 is attached to the center of the heating barrel 11 in the vertical direction or a position above the center. In this way, the posture of the heating barrel 11 can be stabilized when the heating barrel 11 is moved in the vertical direction or horizontal direction.

[0055] In addition, in the replacement work of the heating barrel 11, the worker sets the control device 40 to a heating barrel replacement mode. The heating barrel holding plate 13 and the screw holding plate 14 are brought closer to each other than the maximum separation distance Dm during normal operation, and the heating barrel holding plate 13 is moved upward from the upper limit position Pm during normal operation. The frame 110 is disposed below the heating barrel holding plate 13 of the vertical injection molding machine 1. The slider 120 is attached to the heating barrel 11. The shaft 131 of the lifting member 130 is rotated around its axis to move the table 132 upward until it abuts against the tip of the heating barrel 11. The heating barrel 11 is removed from the heating barrel holding plate 13 and placed on the table 132. The shaft 131 of the lifting member 130 is rotated around its axis to move the table 132 downward until the slider 120 is placed on the moving lane 112. The slider 120 is slid on the moving lane 112, and the heating barrel 11 is moved in the horizontal direction together with the slider 120. In this way, the heating barrel 11 can be easily replaced by hand.

[0056] Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention. [Explanation of symbols]

[0057] 1...vertical injection molding machine, 2...upper mold, 3...lower mold, 5...base, 10...injection device, 11...heating barrel, 11a...nozzle, 11b...fitting hole, 12...screw, 13...heating barrel holding plate, 14...screw holding plate, 15...injection device drive unit, 15a...ball screw mechanism, 15a1...ball screw shaft, 15a2...nut body, 16...screw drive unit, 16a...rotating member, 20...mold clamping device, 21...movable die plate, 21a...lower surface, 21b...through hole, 21c...upper surface, 22...rotary table, 22a...upper surface, 23...base bracket, 24...cover, 30...display / operation device, 31...display unit, 32...operation unit, 40...control device, 100...heating barrel Replacement jig, 110...frame, 111...frame body, 112...movement lane, 113...guide post, 114...nut member, 120...slider, 121...slider body, 121A...left part, 121B...right part, 122...heating barrel holding hole, 122b...fitting protrusion, 123...wheel, 124...grip, 130...lifting member, 131...shaft, 132...table, 133...handle, 134...screw lifting jig, 140...screw drop prevention jig, 140a...notch, 140b...jig insertion hole, 150...eye bolt, Dm...maximum separation distance during normal operation, Dn...distance when replacing heating barrel, Pm...upper limit position during normal operation, Pn...upper limit position when replacing heating barrel

Claims

[Claim 1] A vertical injection molding machine having a heater barrel with a tip facing downward, a screw housed in the heater barrel, a heater barrel holding plate to which the heater barrel is attached, a screw holding plate disposed above the heater barrel holding plate and to which the screw is attached, an injection device driving unit that moves the heater barrel holding plate in a vertical direction, a screw driving unit that moves the screw holding plate in a vertical direction relative to the heater barrel holding plate, and a control device that controls the injection device driving unit and the screw driving unit, an upper limit position of the heater barrel holding plate during normal operation is set so that the screw holding plate does not collide with a component of the vertical injection molding machine even when the heater barrel holding plate moves upward when the heater barrel holding plate and the screw holding plate are separated by a maximum separation distance during normal operation, The control device has a normal operation mode in which the heater barrel holding plate is restricted from moving upward from the upper limit position during normal operation, and a heater barrel replacement mode in which the heater barrel holding plate is permitted to move upward from the upper limit position during normal operation, When removing the heating barrel from the heating barrel holding plate, the control device controls the injection device drive unit and the screw drive unit in the normal operation mode so as to separate the heater barrel holding plate and the screw holding plate by the maximum separation distance during normal operation and to move the heater barrel holding plate to an upper limit position during normal operation; Then, the control device controls the injection device drive unit and the screw drive unit so that, in the heater barrel replacement mode, the heater barrel holding plate is moved upward from the upper limit position during normal operation to bring the heater barrel holding plate and the screw holding plate closer to a heater barrel replacement distance that is smaller than the maximum separation distance during normal operation. however, the normal operation maximum separation distance is a maximum distance that the heater barrel holding plate and the screw holding plate can be separated from each other in the normal operation mode, The heater barrel replacement distance is the minimum distance between the heater barrel holding plate and the screw holding plate required for the heater barrel replacement work.

Images