Heater barrel replacement jig and heater barrel replacement method for vertical injection molding machine

Abstract

To provide a heating cylinder replacement jig that can be worked manually and can suppress damage to a heating cylinder, and a heating cylinder replacement method using the heating cylinder replacement jig.SOLUTION: A heating cylinder replacement jig comprises: a frame 110 disposed below a heating cylinder holding plate 13 of a vertical injection molding machine; a slider 120 attached to the heating cylinder 11 and configured to be slidable on a movement lane 112 provided horizontally on the frame 110; and an elevating member 130 that moves the heating cylinder 11 in a vertical direction. The elevating member 130 comprises: a shaft 131 attached to the frame 110 by a screw structure; and a table 132 attached to an upper end of the shaft 131. The table 132 moves up and down by rotating the shaft 131 about an axis thereof.SELECTED DRAWING: Figure 10

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 relating to replacement of the 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, a heater barrel replacement jig is used to replace the heater barrel. The heater barrel replacement jig has a slider body, a slider plate slidably attached to the slider body, and a cylindrical heater barrel insertion and holding portion fixed to the upper surface of the slider plate. When removing a heater barrel, an operator places the slider body of the heater barrel replacement jig on the upper surface of the movable die plate and moves the heater barrel holding plate downward to insert the tip of the heater barrel into the heater barrel insertion and holding portion. Then, the operator removes the heater barrel from the heater barrel holding plate and slides the slider plate relative to the slider body to transport the heater barrel held in the heater barrel insertion and holding portion to a predetermined position next to 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 the heating barrel) can be attached and detached by rotating it around the pivot point. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-153110 [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 barrel holding plate is movable up and down 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 barrel holding plate and is movable up and down relative to the barrel holding plate. A connecting bracket that connects the ball screw shaft is disposed above the barrel holding plate. In the vertical injection molding machine, the upper limit position of the barrel holding plate is set so that the screw holding plate does not collide with the connecting bracket even when the barrel holding plate moves upward when the barrel holding plate and the screw holding plate are separated by the maximum distance possible during normal operation (maximum separation distance during normal operation). Therefore, if the barrel holding plate were movable to a higher position for replacing the barrel, the connecting bracket would also need to be positioned higher to avoid a collision, which would increase the height 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, it is manually positioned in the vertical direction. However, as the vertical injection molding machine becomes larger, the plasticizing unit also becomes larger, making this manual work very difficult.

[0008] Therefore, the present invention aims to provide a vertical injection molding machine that can prevent the height dimension from increasing, a heater barrel replacement jig that can be operated by hand and can prevent 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 includes a heating barrel having a tip portion facing downward, a screw housed in the heating barrel, a heating barrel holding plate to which the heating barrel is attached, a screw holding plate disposed above the heating barrel holding plate and to which the screw is attached, an injection device driving unit that moves the heating barrel holding plate in a vertical direction, a screw driving unit that moves the screw holding plate in a vertical direction relative to the heating 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 heating 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 heating barrel holding plate moves upward when the heating 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 heating barrel holding plate from moving upward beyond the upper limit position during normal operation, and a heating barrel replacement mode that allows the heating 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, comprising 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 that moves 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.

[0011] In order to achieve the above object, another aspect of the present invention provides a heating barrel replacement method for replacing the heating barrel using a heating barrel replacement jig in a vertical injection molding machine having: a heating barrel with a tip facing downward; a screw housed in the heating barrel; a heating barrel holding plate to which the heating barrel is attached; a screw holding plate disposed above the heating barrel holding plate and to which the screw is attached; an injection device drive unit that moves the heating 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 heating barrel holding plate; and a control device that controls the injection device drive unit and the screw drive unit, wherein the vertical injection molding machine has an upper limit position during normal operation set for the heating barrel holding plate so that the screw holding plate will not collide with components of the vertical injection molding machine even when the heating barrel holding plate moves upward when the heating barrel holding plate and the screw holding plate are separated by a maximum separation distance during normal operation, and the control device controls the heating barrel holding plate to be moved upward from the upper limit position during normal operation. and a heating barrel replacement mode in which the heating barrel holding plate is allowed to move above an upper limit position during normal operation. The heating barrel replacement jig has a frame, a slider configured to be slidable on a moving lane provided horizontally on the frame, and an elevating member that moves the heating barrel in the up and down direction. The elevating member has a shaft attached to the frame by a screw structure and a table attached to an upper end of the shaft, and the shaft is rotated around its axis to perform the heating barrel replacement. the control device is switched to the heating barrel replacement mode, the heating barrel holding plate and the screw holding plate are brought closer to each other than the maximum separation distance during normal operation, the heating barrel holding plate is moved upward from the upper limit position during normal operation, the frame is disposed below the heating barrel holding plate of the vertical injection molding machine, the slider is attached to the heating 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 heating 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 around 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. [Effects of the Invention]

[0012] The vertical injection molding machine according to the present invention has a normal operation mode that restricts the barrel holding plate from moving above its upper limit position during normal operation, and a barrel replacement mode that allows the barrel holding plate to move above its upper limit position during normal operation. This configuration allows the machine to switch to the normal operation mode when performing normal operations such as molding, thereby avoiding collisions between the screw holding plate and components of the vertical injection molding machine. When replacing a barrel, the machine can switch to the barrel replacement mode, allowing the barrel holding plate to move above its upper limit position during normal operation while taking care not to collide with the screw holding plate. This prevents the vertical injection molding machine from becoming too large 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 slide along a horizontal moving lane on the frame, and an elevating member for moving the heating barrel up and down. The elevating 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 so that the table moves up and down by rotating the shaft around its axis. With this configuration, the heating barrel placed on the table can be manually moved up and down by attaching a handle or the like to the shaft of the elevating member and rotating it. The slider also allows the heating barrel to be easily moved horizontally.

[0014] In addition, in the method for replacing a heater barrel according to the present invention, 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 together than the maximum separation distance during normal operation, and moves the heater barrel holding plate above its upper limit position during normal operation. The operator then places a frame below the heater barrel holding plate of the vertical injection molding machine. The operator then attaches a slider to the heater barrel. The operator then rotates the shaft of the lifting member about its axis to move the table upward until it abuts against the tip of the heater barrel. The operator then removes the heater barrel from the heater barrel holding plate and places it on the table. The operator then rotates the shaft of the lifting member about its axis to move the table downward until the slider rests on the moving lane. The operator then slides the slider on the moving lane to move the heater barrel horizontally together with the slider. This allows the heater barrel to be easily replaced manually. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a front view of a vertical injection molding machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram illustrating the functional blocks of the vertical injection molding machine of FIG. 1. [Figure 3] 2 is a perspective view of a heater barrel replacement jig used to replace the heater barrel of the vertical injection molding machine of FIG. 1. FIG. [Figure 4] FIG. 4 is a front view of the heating barrel replacement jig of FIG. 3. [Figure 5] FIG. 4 is a right side view of the heating barrel replacement jig of FIG. 3. [Figure 6] 1 (a state in which the heating barrel holding plate and the screw holding plate are moved to the rearmost position in the normal operation mode). FIG. [Figure 7] FIG. 2 is a diagram illustrating 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 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 the frame of the heating barrel replacement jig is placed 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 heating barrel replacement jig and a slider is attached to the heating 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 heating 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 illustrating a method for replacing the heating barrel of the vertical injection molding machine of FIG. 1 (after the replaced heating barrel is attached to the heating barrel holding plate, the heating 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 heating barrel). FIG. [Figure 15] 1 (a state in which the screw inserted in the replaced heating barrel is moved upward). FIG. [Figure 16] 1 (a state in which the screw inserted in the replaced heating barrel is attached to the screw holding plate). FIG. DETAILED DESCRIPTION OF THE INVENTION

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

[0017] As shown in Fig. 1, the vertical injection molding machine 1 has an injection unit 10, a mold clamping unit 20, and a display and 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 resin into a cavity formed by the upper mold 2 and the lower mold 3. The injection device 10 has a heating barrel 11 and a screw 12. The heating barrel 11 has a nozzle 11a at its tip that faces downward. The screw 12 is housed within the heating barrel 11.

[0019] The mold clamping device 20 opens and closes the upper mold 2 and the lower mold 3, and generates a mold clamping force to clamp the upper mold 2 and the lower mold 3 when they are closed. The mold 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 its lower surface 21a. The rotary table 22 has the lower mold 3 attached to its 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 mold clamping device 20 clamps the upper mold 2 and the lower mold 3 together, a cavity is formed.

[0020] A 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 mold 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 its 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 rotatably holds the screw 12. 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 vertical 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 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 rotated by the electric motor for moving the injection device, the nut body 15a2 moves in the vertical direction along the ball screw shaft 15a1. Three nut bodies 15a2 are provided, one for each ball screw shaft 15a1.

[0024] The screw driver 16 rotates the screw 12 and moves it up and down. The screw driver 16 has a rotating member 16a, a ball screw mechanism (not shown), a screw rotation electric motor (not shown), and a screw movement electric motor (not shown). The rotating member 16a is configured to rotate integrally with the screw 12. When the rotating member 16a is rotated by the screw rotation electric motor, the screw 12 rotates around its axis. The ball screw mechanism of the screw driver 16 is driven by the screw movement electric motor and moves the screw holding plate 14, to which the screw 12 is attached, up and down 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 software switches configured by combining 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 barrel holding plate 13 and the screw holding plate 14 can be apart from each other during normal operation (hereinafter referred to as the "maximum normal operation distance Dm"). During normal operation, when the barrel holding plate 13 and the screw holding plate 14 are separated by the maximum normal operation distance Dm, the screw holding plate 14 is in its rearmost position. The memory of the control device 40 also stores an upper limit position of the barrel holding plate 13 (hereinafter referred to as the "normal operation upper limit position Pm") at which the screw holding plate 14 will not collide with a component of the vertical injection molding machine 1 (specifically, the connecting bracket 15b) even when the barrel holding plate 13 moves upward when the barrel holding plate 13 and the screw holding plate 14 are separated by the maximum normal operation distance Dm. The normal operation upper limit position Pm is the rearmost position of the barrel holding plate 13 during normal operation. The normal operation is the molding operation of the vertical injection molding machine 1 and the operation performed 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 above the upper limit position Pm during normal operation. In the normal operation mode, the control device 40 performs normal operations such as a molding operation for injection molding a molded product and a purging operation for discharging resin from the heater barrel 11. In the heater barrel replacement mode, the control device 40 allows the heater barrel holding plate 13 to move above the upper limit position Pm during normal operation. In the heater barrel replacement mode, the control device 40 performs the operations necessary to replace the heater barrel 11.

[0029] The control device 40 executes molding operations in the normal operation mode. During molding operations, the control device 40 controls the mold clamping device 20 to clamp the upper mold 2 and the lower mold 3 together. The control device 40 controls the injection device driver 15 to bring the nozzle 11a of the heating barrel 11 into contact with the upper mold 2. The control device 40 controls the screw driver 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 driver 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 mold 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 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 above the upper limit position Pm during normal operation. Specifically, 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 to the minimum distance required for replacing the barrel 11 (hereinafter referred to as the "barrel replacement distance Dn") and to move the barrel holding plate 13 to the highest position (hereinafter referred to as the "barrel replacement upper limit position Pn") at which the screw holding plate 14 does not collide with the connecting bracket 15b. The barrel replacement distance Dn is smaller than the maximum separation distance Dm during normal operation. The 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 the mechanical limit distance between the heating barrel holding plate 13 and the screw holding plate 14.

[0031] Next, a heating barrel replacement jig 100 used when replacing the heating 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 an elevating member 130. The elevating member 130 is shown in FIG.

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

[0034] The slider 120 is attached to the heating barrel 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 barrel holding hole 122 inside which the heating barrel 11 is placed. The diameter of the heating barrel holding hole 122 is the same as the outer diameter of the heating barrel 11. An engaging protrusion 122b is provided on the inner surface of the heating barrel holding hole 122. The engaging protrusion 122b is fitted into an engaging hole 11b provided on the outer peripheral surface of the heating barrel 11. The engaging hole 11b is provided at the center of the heating barrel 11 in the vertical direction or at a position above this center. In other words, the slider 120 is attached to the center of the heating barrel 11 in the vertical direction or at a position above this center. Note that, as long as the heating barrel 11 can be held so as not to fall out of the heating barrel holding hole 122, the heating barrel replacement jig 100 and the heating barrel 11 may be configured without the fitting protrusion 122b and the fitting hole 11b. 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 disposed between two wheels 123 aligned in the front-rear direction. The guide post 113 contacts the wheels 123 and guides the vertical movement of the slider 120. The slider body 121 slides in the front-rear direction by traveling on the moving lane 112 using the wheels 123. The slider body 121 has a symmetrical shape 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 barrel 11 in the up and 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 so that the table 132 moves in the up and 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 heating barrel 11 using the heating barrel replacement jig 100 in the above-described vertical injection molding machine 1 will be described with reference to Figures 6 to 16. Figures 6 to 11, 12(a), 13, 14(a), 15, and 16 are views of the portion above the movable die plate 21 in the vertical injection molding machine 1 as viewed from the right side. Figures 12(b) and 14(b) are views of the heating barrel 11 as viewed from below. For ease of explanation, some members are shown in cross section or are omitted in Figures 6 to 16.

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

[0038] The operator operates the operating unit 32 to control the injection device driver 15 and the screw driver 16 using the control device 40 in normal operation mode, thereby separating the heating barrel holding plate 13 and the screw holding plate 14 by the maximum separation distance Dm during normal operation and moving 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 their rearmost positions 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 unit 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, as shown in Figure 7, and move the barrel holding plate 13 to the barrel replacement upper limit position Pn. 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, as shown in FIG. 9 , the worker attaches the slider 120 to the heating barrel 11. Specifically, the heating barrel 11 is sandwiched between the left part 121A and the right part 121B so that the heating barrel 11 is placed inside the heating barrel 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 circumferential surface of the heating barrel holding hole 122 is fitted into the fitting hole 11b provided on the outer circumferential surface of the heating barrel 11. This completes the attachment of the slider 120 to the heating barrel 11. The worker also attaches the lifting member 130 to the frame 110. Specifically, the worker threads 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 around 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 barrel 11 from the heating barrel holding plate 13 and places the heating barrel 11 on the table 132. The worker rotates the handle 133 to rotate the shaft 131 about its axis, and moves the table 132 downward until the slider 120 rests on the movement lane 112 of the frame 110, as shown in FIG. 11 . At this time, guide posts 113 are arranged between the wheels 123 aligned in the front-to-rear direction of the slider 120, and the guide posts 113 guide the downward movement of the slider 120. The worker moves the heating barrel 11 forward together with the slider 120 by pulling the handle 124 of the slider 120 forward. The worker attaches an eyebolt 150 to the base end of the heating barrel 11 that has moved forward, and uses a crane (not shown) to carry the heating barrel 11 out.

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

[0045] A worker uses a crane (not shown) to carry the heating barrel 11 with the slider 120 attached so that the slider 120 rests on the moving lane 112 of the frame 110. The worker pushes the handle 124 of the slider 120 backward to move the heating barrel 11 backward together with the slider 120. At this time, the central axis of the nut member 114 of the frame 110 is aligned with the central axis of the heating barrel 11. 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 tip of the heating barrel 11. The worker further rotates the handle 133 to move the table 132 upward until the base end of the heating barrel 11 reaches the mounting position of the heating barrel holding plate 13. At this time, guide posts 113 are arranged between the wheels 123 aligned in the front-to-rear direction of the slider 120, and the guide posts 113 guide the upward movement of the slider 120. As shown in Figure 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-like shape and is provided with a bolt hole at one end and a notch 140a at the other end for hooking onto a bolt. The screw drop prevention jig 140 is attached to the heating barrel 11 so that it can rotate around the bolt hole.

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

[0047] Next, as shown in Fig. 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, thereby preventing 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 upward together with the table 132 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. The operator then attaches the cover of the injection unit 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 disposed above the heating barrel holding plate 13 and to which the screw 12 is attached, the injection device drive unit 15 that moves the heating barrel holding plate 13 up and down, the screw drive unit 16 that moves the screw holding plate 14 up and down relative to the heating barrel holding plate 13, and the control device 40 that controls 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 will 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 heating barrel holding plate 13 from moving above the normal operation upper limit position Pm, and a heating barrel replacement mode that allows the heating barrel holding plate 13 to move above the normal operation upper limit position Pm. This configuration allows the normal operation mode to be switched to when performing a normal operation such as a molding operation, thereby avoiding collision between the screw holding plate 14 and the connecting bracket 15b. When replacing the heating barrel 11, the mode can be switched to the heating barrel replacement mode, allowing the heating barrel holding plate 13 to move above the normal operation upper limit position Pm while taking care not to collide with the screw holding plate 14. This prevents the vertical injection molding machine 1 from becoming too 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 barrel replacement jig 100 includes a frame 110 disposed below the barrel holding plate 13 of the vertical injection molding machine 1, a slider 120 attached to the barrel 11 and configured to be slidable on a transfer lane 112 horizontally provided on the frame 110, and an elevating member 130 for moving the barrel 11 up and down. The elevating 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 elevating member 130 is configured to move the table 132 up and down by rotating the shaft 131 about its axis. With this configuration, the barrel 11 placed on the table 132 can be manually moved up and down by rotating a handle 133 attached to the shaft 131 of the elevating member 130. The slider 120 also allows the barrel 11 to be easily moved horizontally. It should be noted that the shaft 131 may be rotated using a handheld electric drill instead of the handle 133. By rotating the shaft 131 with the handle 133 or a handheld electric drill, the worker can sensitively sense the change in rotation load when the heating barrel 11 collides with some kind of member, and can immediately stop the rotation of the shaft 131. Therefore, damage to the heating barrel 11 can be suppressed.

[0053] Furthermore, 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. This makes it possible to prevent the heating barrel 11 from tilting when it moves in the vertical direction.

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

[0055] Furthermore, in the work of replacing the heating barrel 11, the worker sets the control device 40 to the heating barrel replacement mode. The heating barrel holding plate 13 and the screw holding plate 14 are brought closer together than the maximum separation distance Dm during normal operation, and the heating barrel holding plate 13 is moved above the upper limit position Pm during normal operation. The frame 110 is placed 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 about 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 about its axis to move the table 132 downward until the slider 120 rests on the transfer lane 112. The slider 120 is slid on the transfer 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 spirit 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 and 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...handle, 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...eyebolt, 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

1. A heater barrel replacement jig used when replacing a heater barrel of a vertical injection molding machine, a frame disposed below a heater barrel holding plate of the vertical injection molding machine; a slider attached to the heating barrel and configured to be slidable on a moving lane provided horizontally on the frame; a lifting member that moves the heating barrel in the up and down direction, A heating barrel replacement jig characterized in that 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 up and down by rotating the shaft around its axis.

2. the slider has a plurality of wheels for traveling on the travel lane; 2. The heating barrel replacement jig according to claim 1, wherein the frame is disposed between the plurality of wheels and has guide posts for guiding the slider in its vertical movement.

3. 3. The heating barrel replacement jig according to claim 1, wherein the slider is attached to a central portion of the heating barrel in the vertical direction or a portion above the central portion.

4. A heater barrel replacement method for replacing a heater barrel using a heater barrel replacement jig in a vertical injection molding machine having: a heater barrel with a tip portion 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 drive unit that moves the heater barrel holding plate in a vertical direction; a screw drive 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 drive unit and the screw drive unit, an upper limit position of the heating 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 heating barrel holding plate moves upward when the heating barrel holding plate and the screw holding plate are spaced apart by the maximum separation distance during normal operation; the control device has a normal operation mode in which the heating barrel holding plate is restricted from moving upward from the upper limit position during normal operation, and a heating barrel replacement mode in which the heating barrel holding plate is permitted to move upward from the upper limit position during normal operation, The heating barrel replacement jig has a frame, a slider configured to be slidable on a moving lane provided horizontally on the frame, and a lifting member that moves the heating barrel in an up-and-down direction, and 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, switching the control device to the heating barrel replacement mode, bringing the heating barrel holding plate and the screw holding plate closer to each other than the maximum separation distance during normal operation, and moving the heating barrel holding plate above the upper limit position during normal operation; the frame is disposed below the heater barrel holding plate of the vertical injection molding machine; Attaching the slider to the barrel; The shaft of the lifting member is rotated about its axis to move the table upward until it abuts against the tip of the heating barrel; Remove the heating barrel from the heating barrel holding plate and place it on the table; The shaft of the lifting member is rotated about its axis to move the table downward until the slider rests on the transfer lane; A heating barrel replacement method, comprising: sliding the slider on the moving lane to move the heating barrel together with the slider in a horizontal direction.

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