Mold reversal device

Abstract

The present invention aims to provide a mold inversion device with a simple structure, reduced manufacturing costs, and safety features that facilitate installation and maintenance. [Solution] The present invention relates to a mold reversal device in which a pair of left and right mold support plates 1 are pivotally supported at their left and right center portions on a horizontal pivot shaft 3 provided on a base 2, and a drive device 4 is provided to change the orientation of the pair of mold support plates 1 between a horizontal and a vertical position. When the orientation of the mold support plates 1 is changed from a horizontal to a vertical position, a safety device 8 made of pipe material is provided between the lower surface of the mold support plates 1 and the base 2 to prevent people from entering but to allow maintenance work.

Description

Technical Field

[0001] The present invention relates to a mold reversing device.

Background Art

[0002] As a mold reversing device for reversing a mold by 90 degrees, roughly speaking, there are a sector gear - electric motor type and a hydraulic cylinder type. As the hydraulic cylinder type, there is one described in Japanese Patent Laid - Open No. 8 - 80531 (Patent Document 1). This conventional device supports the base ends of a pair of left - and - right mold support plates via a pivot mechanism so as to be rotatable around a common horizontal axis, fixes the pivot mechanism to the upper end of the base, and disposes hydraulic cylinders for driving each mold support plate at positions near the lower surface sides of the corresponding plates, connecting them to the base and the tip - side portions of the lower surfaces of the mold support plates.

[0003] As the sector gear - electric motor type, the mold reversing device described in Japanese Patent Laid - Open No. 8 - 132485 (Patent Document 2) has first and second mold support plates having a mold support surface on which a mold is placed, which are rotatably supported by a pivot mechanism around a pivot shaft. A first sector plate is fixed to the lower surface of the mold support surface of the first mold support plate, and a second sector plate is fixed to the lower surface of the mold support surface of the second mold support plate. Each sector body is composed of a pair of sector plates and a plurality of pin members bridged on the outer peripheral portions of the pair of sector plates. The pin members are engaged with a sprocket, and the sprocket is rotated by each rotation drive mechanism to feed the pin members forward so that each mold support plate can be rotated independently.

[0004] In the above - mentioned conventional mold reversing device, a "bellows (japara)" as described in Japanese Patent Laid - Open No. 10 - 194688 (Patent Document 3) was provided so as to cover the gap between the mold support plate and the base.

Prior Art Documents

[0006] The aforementioned conventional bellows are a safety device designed to prevent people from getting caught in them during reversal operations, but they were expensive.

[0007] Furthermore, during the delivery and installation of the mold reversal device, the bellows had to be removed at the delivery site in order to attach the central part to the foundation. In addition, the bellows also had to be removed during maintenance (lubrication), which added to the time required for maintenance work.

[0008] Therefore, the present invention aims to provide a mold inversion device with a simple structure, reduced manufacturing costs, and safety features that facilitate installation and maintenance. [Means for solving the problem]

[0009] To achieve the above objective, the present invention employs the following means. Specifically, the present invention provides a mold reversal device in which a pair of left and right mold support plates are pivotally supported at their left and right central portions on a horizontal pivot shaft provided on a base, and a drive device is provided for changing the orientation of the pair of mold support plates between a horizontal and a vertical position. When the orientation of the mold support plates is changed from a horizontal to a vertical position, a safety device made of pipe material is provided between the lower surface of the mold support plates and the base, which prevents human entry but allows maintenance work.

[0010] The safety device has a protective bar made of the pipe material, and it is preferable that the protective bar is formed in a U-shape in plan view and has front and rear side portions extending in the left and right directions from the left and right central portion along the outer circumference of the mold support plate in a horizontal position, and left and right side portions connecting the front and rear side portions.

[0011] Preferably, the ends of the front and rear sides of the protective bar are pivotally supported on the base so as to be rotatable, and a cylinder device is provided to rotate the protective bar upward when the mold support plate changes its orientation from a horizontal to a vertical position.

[0012] The ends of the front and rear sides of the protective bar are pivotally supported on the base, and the system may have a first holding device that holds the protective bar along with the rise of the mold support plate when the mold support plate changes its orientation from horizontal to vertical.

[0013] The front and rear sides of the protective bar are fixed to a vertically extendable device provided on the base, so that the front and rear sides move vertically while maintaining a horizontal position. The device may also have a second holding device that holds the protective bar along with the rise of the mold support plate when the mold support plate changes position from horizontal to vertical.

[0014] Guide plates are provided at the ends of the front and rear sides of the protect bar, and a third holding device is provided that holds the protect bar along with the rise of the mold support plate when the mold support plate changes its orientation from a horizontal to a vertical position, and the third holding device may have an arc-shaped elongated hole provided in the guide plate centered on the axis of the pivot shaft, a pin provided in the mold support plate that engages with the arc-shaped elongated hole, and a tilt prevention member that engages with the guide plate to prevent the guide plate from tilting.

[0015] The drive device preferably includes a fluid pressure drive cylinder device or a sector gear device provided between the mold support plate and the base. [Effects of the Invention]

[0016] According to the present invention, compared with the conventional jawara, since it is composed of pipe materials, it has a simple structure, can reduce the manufacturing cost, and also has the effect of facilitating the installation work and the maintenance work.

Brief Explanation of Drawings

[0017] [Figure 1] Figure 1 is a plan view showing a first embodiment of the mold inversion device of the present invention. [Figure 2] Figure 2 is a front view of Figure 1. [Figure 3] Figure 3 is a front view showing the inclined posture of the mold support plate. [Figure 4] Figure 4 is a front view showing the vertical posture of the mold support plate. [Figure 5] Figure 5 is an enlarged view of the main part in Figure 2. [Figure 6] Figure 6 is a front view showing a second embodiment of the mold inversion device of the present invention. [Figure 7] Figure 7 is a front view showing the inclined posture of the mold support plate. [Figure 8] Figure 8 is a front view showing the vertical posture of the mold support plate. [Figure 9] Figure 9 is an enlarged view of the main part in Figure 6. [Figure 10] Figure 10 is a plan view of Figure 9. [Figure 11] Figure 11 is a front view showing a third embodiment of the mold inversion device of the present invention. [[ID=4C]] [Figure 12] Figure 12 is a front view showing the inclined posture of the mold support plate. [Figure 13] Figure 13 is a front view showing the vertical posture of the mold support plate. [Figure 14] Figure 14 is a view taken in the direction of arrow A in Figure 12. [Figure 15] Figure 15 is a front view showing a fourth embodiment of the mold inversion device of the present invention. [Figure 16] [[ID=S3]]Figure 16 is a front view showing the inclined posture of the mold support plate. [Figure 17] Figure 17 is a front view showing the vertical posture of the mold support plate. [Figure 18] Figure 18 is an enlarged view of the main part of Figure 15. [Modes for carrying out the invention]

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 5 show a mold reversal device according to the first embodiment of the present invention.

[0019] The mold inversion device is a device for inverting a mold by 90 degrees, and by repeatedly inverting it by 90 degrees, it can also be inverted by 180 degrees. In this mold inversion device, a pair of left and right mold support plates 1 are pivotally supported at their left and right centers on a horizontal pivot shaft 3 provided on a base 2, and a drive device 4 is provided to change the orientation of the pair of mold support plates 1 between a horizontal position and a vertical position.

[0020] Herein, we define the directions described below. "Left and right" refers to the left and right directions in Figure 2, "front and back" refers to the horizontal direction perpendicular to the left and right directions in Figure 2, and "up and down" refers to the up and down directions in Figure 2.

[0021] The pair of left and right mold support plates 1 consist of a left-side first mold support plate 1A and a right-side second mold support plate 1B. The upper surfaces of the first mold support plate 1A and the second mold support plate 1B form flat mold support surfaces 5. The right end (base end) of the left-side first mold support plate 1A and the left end (base end) of the right-side second mold support plate 1B are connected to the pivot shaft 3 in a comb-like manner (see Figure 1). The base 2 on which the pivot shaft 3 is attached is provided on a base frame 6 installed on the floor.

[0022] The drive device 4 is comprised of a fluid pressure driven cylinder device provided between the mold support plate 1 and the base 2. The fluid pressure driven cylinder device consists of a first hydraulic cylinder 4A provided between the lower surface of the first mold support plate 1A and the base 2, and a second hydraulic cylinder (not shown) provided between the lower surface of the second mold support plate 1B and the base 2. A pin 7 for connecting the piston rod of the first hydraulic cylinder 4A is provided on the first mold support plate 1A.

[0023] By extending the piston rod of the first hydraulic cylinder 4A, the first mold support plate 1A changes its orientation from the horizontal state shown in Figure 2 to the vertical state shown in Figure 4.

[0024] When the mold support plate 1 changes its orientation from horizontal to vertical, a safety device 8 (see Figure 4), made of pipe material, is provided between the lower surface of the mold support plate 1 and the base 2 to prevent people from entering but to allow maintenance work.

[0025] The safety device 8 has a protective bar 9 made of pipe material, and the protective bar 9 is formed in a U-shape in plan view and has front and rear side portions 9a extending from the left and right central portion in the left and right direction along the outer circumference of the mold support plate 1 in a horizontal position, and left and right side portions 9b connecting the front and rear side portions 9a.

[0026] The ends of the front and rear side portions 9a of the protective bar 9 are pivotally supported on the base 2 via a pivot point 10. This pivot point 10 is located coaxially with the pivot shaft 3 (see Figure 5).

[0027] A cylinder device 11 is provided to rotate the protect bar 9 upward when the mold support plate 1 changes its orientation from horizontal to vertical. This cylinder device 11 is composed of a gas balancer damper, but it may also be a fluid pressure driven type.

[0028] The protect bar 9 consists of a first protect bar 9A provided on the first mold support plate 1A side and a second protect bar 9B provided on the second mold support plate 1B side.

[0029] The right end of the front and rear side portion 9a of the first protect bar 9A is pivotally supported on the base 2 via a pivot point 10 so as to be rotatable, and the left end of the front and rear side portion 9a of the second protect bar 9B is pivotally supported on the base 2 via a pivot point 10 so as to be rotatable.

[0030] The cylinder device 11 consists of a first cylinder 11A on the first mold support plate 1A side and a second cylinder 11B on the second mold support plate 1B side.

[0031] The piston rods of the first and second cylinders 11A and B are connected to the middle portions of the front and rear side portions 99a of the first and second protective bars 9A and B, and the cylinder ends of the first and second cylinders 11A and B are connected to the base 2.

[0032] The first mold support plate 1A and the second mold support plate 1B are provided with stoppers 12 that, in the horizontal position shown in Figure 2, contact the first and second protect bars 9A and B to prevent them from rotating upward, thereby maintaining the horizontal position. When the first mold support plate 1A is in the inclined position shown in Figure 3, the first protect bar 9A rotates upward while in contact with the stopper 12. However, in the vertical position shown in Figure 4, the contact with the stopper 12 is released, but the first protect bar 9A maintains its inclined position due to the first cylinder 11A.

[0033] The safety device 8 prevents a person from entering the lower side of the first mold support plate 1A by the first protect bar 9A when the first mold support plate 1A changes its orientation from the horizontal position shown in Figure 2 to the vertical position shown in Figure 4. The function of the safety device 8 is the same on the second mold support plate 1B side.

[0034] With a safety device 8 of this configuration, manufacturing costs can be reduced compared to conventional bellows-type devices, and installation and maintenance work can be simplified.

[0035] In this invention, the cylinder device 11 is not limited to being provided on the front and rear side portions 9a of the protect bar 9, but may also be provided on the left and right side portions 9b.

[0036] Figures 6 to 10 show a second embodiment of the present invention, in which the cylinder device 11 of the safety device 8 of the first embodiment is replaced with another configuration, while the other configurations are substantially the same.

[0037] For the sake of simplicity, in the following explanation, the mold support plate 1 will be referred to collectively as "1" rather than as the first and second mold support plates 1A and 1B.

[0038] In this second embodiment, the ends of the front and rear side portions 9a of the protect bar 9 are pivotally supported on the base 2 so as to be rotatable, and there is a first holding device 13 that holds the protect bar 9 along with the rise of the mold support plate 1 when the mold support plate 1 changes its orientation from a horizontal to a vertical position.

[0039] The first support device 13, as shown in detail in Figures 9 and 10, has locking pins 14 provided on the front and rear sides 9a of the protect bar 9 and an arm 15 provided on the mold support plate 1. The arm 15 is provided with an engaging recess 16, and when the mold support plate 1 rotates upward around the axis of the pivot shaft 3, the engaging recess 16 engages with the locking pins 14, causing the protect bar 9 to rotate upward around the pivot point 10. When the mold support plate 1 is in the vertical position shown in Figure 8, the protect bar 9 is held by the arm 15 in a position that prevents a person from entering the lower side of the mold support plate 1.

[0040] Figures 11 to 14 show a third embodiment of the present invention. In this embodiment, the front and rear side portions 9a of the protect bar 9 are fixed to a vertically extendable device 17 provided on the base 2, and the front and rear side portions 9a are configured to move vertically while maintaining a horizontal position.

[0041] When the mold support plate 1 changes its orientation from horizontal to vertical, it has a second support device 18 that holds the protect bar 9, which is fixed to the vertically extendable device 17, along with the upward movement of the mold support plate 1.

[0042] As shown in Figure 14, the vertically extendable device 17 has an outer guide plate 19 formed in a U-shape in plan view, and an inner guide plate 20 that slides vertically in the up-and-down direction along the inner surface of the outer guide plate 19. The lower end of the outer guide plate 19 is fixed to the base 2, and the front and rear side portions 9a of the protect bar 9 are fixed to the upper end of the inner guide plate 20, maintaining a horizontal position.

[0043] The second support device 18 includes engagement pins 21 provided on the front and rear sides 9a of the protect bar 9 and an arm 22 provided on the mold support plate 1.

[0044] As the mold support plate 1 rotates upward around the axis of the pivot shaft 3, as shown in Figures 12 and 13, the arm 22 engages with the engagement pin 21 and pulls the front and rear sides 9a of the protect bar 9, which is fixed to the inner guide plate 20, upward while maintaining a horizontal position.

[0045] Furthermore, in the present invention, the vertically extendable device 17 is not limited to having an outer guide plate 19 and an inner guide plate 20, but may also be a bamboo shoot type or a cylinder type extendable device.

[0046] Figures 15 to 18 show a fourth embodiment of the present invention. In this embodiment, guide plates 23 are provided at the ends of the front and rear side portions 9a of the protect bar 9, and a third holding device 24 is provided that holds the protect bar 9 along with the rise of the mold support plate 1 when the mold support plate 1 changes its orientation from a horizontal to a vertical position.

[0047] The third support device 24 includes an arc-shaped elongated hole 25 provided in the guide plate 23, centered on the axis of the pivot shaft 3; a pin 26 provided in the mold support plate 1 that engages with the arc-shaped elongated hole 25; and a tilt prevention member 27 that engages with the guide plate 23 to prevent the guide plate 23 from tilting. The pin 26 is provided on an arm 28 provided on the mold support plate 1. The tilt prevention member 27 is made up of a strip-shaped plate provided on the mold support plate 1.

[0048] The guide plate 23 is formed from a rectangular plate material, and the ends of the front and rear side portions 9a of the upper and lower pair of protect bars 9 are fixed to its upper and lower ends.

[0049] As shown in Figure 15, when the mold support plate 1 is in a horizontal position, the pin is located at the lower end of the arc-shaped elongated hole 25, and in the inclined state shown in Figure 16, it engages with the upper end of the arc-shaped elongated hole 25, and in the vertical state shown in Figure 17, the pin 26 moves the guide plate 23 upward while holding it together. At this time, the tilt prevention member 27 contacts the outer circumferential surface of the guide plate 23, maintaining the horizontal position of the front and rear side portions 9a of the pair of upper and lower protect bars 9.

[0050] The present invention is not limited to the embodiments shown above. For example, the drive unit 4 is not limited to a hydraulic cylinder system, but may be a sector gear / electric motor system.

[0051] The scope of the present invention is indicated by the claims rather than the above description, and all modifications within the meaning and scope equivalent to the claims are included. [Explanation of symbols]

[0052] 1 Mold support plate 1A 1st mold support plate 1B 2nd mold support plate 2 bases 3 Pivot 4. Drive system 4A First hydraulic cylinder 5 Mold support surface 6 Base frame 7 pins 8 Safety equipment 9. Protect Bar 9A 1st Protect Bar 9B Second Protective Bar 9a Front and rear side sections 9b Left and right sides 10 Pivot points 11 Cylinder device 11A First Cylinder 11B Second Cylinder 12 Stoppers 13 First continuous holding device 14 Locking pin 15 Arms 16 Engaging recess 17 Vertical telescoping device 18 Second continuous holding device 19. Outer guide plate 20 Inner guide plate 21 Engaging pins 22 Arms 23 Guide Plate 24 Third continuous holding device 25 Arc-shaped elongated holes 26 pins 27. Tilt prevention member 28 Arms

Claims

1. In a mold reversal device, a pair of left and right mold support plates are pivotally supported at their left and right center portions on a horizontal pivot shaft provided on a base, and a drive device is provided for changing the orientation of the pair of mold support plates between a horizontal and a vertical position, A mold inversion device is provided between the lower surface of the mold support plate and the base, which is made of pipe material and prevents human entry when the mold support plate changes its orientation from a horizontal to a vertical position, while still allowing maintenance work.

2. The safety device has a protective bar made of the pipe material, The mold inversion device according to claim 1, wherein the protective bar is formed in a U-shape in plan view and has front and rear side portions extending in the left-right direction from the left and right central portion along the outer circumference of the mold support plate in a horizontal position, and left and right side portions connecting the front and rear side portions.

3. The ends of the front and rear sides of the protective bar are pivotally supported on the base so as to be rotatable. The mold inversion device according to claim 2, further comprising a cylinder device for rotating the protect bar upward when the mold support plate changes its orientation from a horizontal to a vertical position.

4. The ends of the front and rear sides of the protective bar are pivotally supported on the base so as to be rotatable. The mold reversal device according to claim 2, further comprising a first holding device that holds the protect bar along with the rise of the mold support plate when the mold support plate changes its orientation from a horizontal to a vertical position.

5. The front and rear sides of the protective bar are fixed to a vertically extendable device provided on the base, so that the front and rear sides move vertically while maintaining a horizontal position. The mold reversal device according to claim 2, further comprising a second holding device that holds the protect bar along with the rise of the mold support plate when the mold support plate changes its orientation from a horizontal to a vertical position.

6. Guide plates are provided at the ends of the front and rear sides of the protective bar. When the mold support plate changes its orientation from a horizontal to a vertical position, it has a third holding device that holds the protect bar along with the upward movement of the mold support plate. The third support device includes an arc-shaped elongated hole provided in the guide plate, centered on the axis of the pivot shaft, The mold inversion device according to claim 2, further comprising a pin that engages with the arc-shaped elongated hole provided in the mold support plate, and a tilt prevention member that engages with the guide plate to prevent the guide plate from tilting.

7. The mold reversing device according to claim 1, wherein the drive device is a fluid pressure driven cylinder device or a sector gear device provided between the mold support plate and the base.

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