Door device

Abstract

To provide a door device having a driving mechanism configured by combining a chain and a sprocket, having a small front-rear dimension, i.e. a thickness, capable of being installed in a narrow place.SOLUTION: A platform door device 1 comprises: a fixing part 3 fixed on a platform 2; a door body 4 supported on the fixing part 3 so as to freely move forward and backward; a chain 15 extended across the door body 4; a sprocket 10 engaged with the chain 15; and a rotary motor 9 fixed on the fixing part 3 for rotating the sprocket 10. The chain 15 is provided inside a cross-sectional profile of the door body 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a door device. [Background technology]

[0002] It is known that door devices equipped with an automatic opening and closing device that automatically opens and closes a sliding door by moving the door body of the sliding door back and forth relative to a fixed part include a rack and pinion mechanism in the drive device. However, door devices equipped with a rack and pinion mechanism have a problem in that opening and closing is hindered if the rack is not accurately positioned relative to the pinion, which makes assembly and installation time-consuming. In a rack and pinion mechanism, the meshing between the rack teeth and the pinion teeth is shallow, which makes fine adjustments during assembly time-consuming.In addition, there is a problem that the meshing between the rack teeth and the pinion teeth is prone to malfunction due to errors during installation or distortion of the housing caused by aging.

[0003] In order to solve this problem, Patent Document 1 or Patent Document 2 proposes providing a door device with a chain and a sprocket meshed with the chain, instead of a rack and pinion.

[0004] Drive mechanisms equipped with chains and sprockets have the advantage of high adjustment flexibility for the meshing between the chain and sprocket teeth, due to the long sprocket teeth and deep meshing depth between the chain and sprocket teeth. In other words, they have the advantage of a large tolerance for meshing depth errors. Furthermore, because there is a large tolerance for variations in meshing depth between the chain and sprocket teeth caused by installation errors or distortion of the housing due to aging, they have the advantage of reducing the frequency of periodic inspections and maintenance to correct meshing depth variations. Furthermore, drive mechanisms equipped with chains and sprockets have a large meshing surface between the chain and sprocket, allowing for the transmission of large power. Therefore, when transmitting the same amount of power, a drive mechanism equipped with chains and sprockets can have a smaller external size. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-36704 [Patent Document 2] Japanese Utility Model Application Publication No. 2-21285 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the door devices described in Patent Documents 1 and 2, the mounting bracket or chain case that houses the chain protrudes from the rear side of the door body. Therefore, the device that is fixed to the installation location needs to be installed away from the door body so as not to interfere with the bracket or chain case. This increases the dimensions of the door device in the front-to-back direction, i.e., its thickness, resulting in the problem of requiring a large installation space.

[0007] The present disclosure has been made in consideration of the above problems, and provides a door device equipped with a drive mechanism formed by combining a chain and a sprocket, which has small dimensions in the front and back directions, i.e., small thickness, and can be installed in a narrow space. [Means for solving the problem]

[0008] To achieve the above object, the door device according to the present disclosure includes a fixed part fixed to an installation location, a door body supported on the fixed part so as to be able to move back and forth, a chain stretched over the door body, a sprocket engaged with the chain, and a rotary electric motor fixed to the fixed part for driving the sprocket to rotate. The chain is disposed inside the outline of the cross-sectional shape of the door body. The door body further includes a beam member extending parallel to the direction in which the door body moves back and forth, the beam member having a recess extending in the direction in which the door body moves back and forth, and the chain is disposed within the recess. Furthermore, an electrically insulating retaining member is fitted into the gap between the beam member and the chain inside the recess. [Effects of the Invention]

[0009] According to the present disclosure, the chain is arranged inside the cross-sectional contour of the door body, so that the door device can be installed in a narrow space. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1A is a diagram showing the configuration of a platform door device according to an embodiment of the present disclosure in a closed door state, and FIG. 1B is a diagram showing the configuration of the platform door device in an open door state. [Figure 2] (A) is an explanatory diagram showing the configuration around the upper beam member provided in the platform door device shown in FIG. 1(A), (B) is an arrow view of the upper beam member as seen from the direction indicated by arrow B in (A), and (C) is a cross-sectional view of the upper beam member cut along the plane indicated by line CC' in (A). [Figure 3] An explanatory diagram showing the operation of the platform door device shown in FIG. 1(A), and a cross-sectional view showing the upper beam member in accordance with FIG. 2(C). [Figure 4] (A) is a cross-sectional view of an upper beam member provided in a platform door device according to a first modified example, shown in FIG. 2(C), and (B) is a cross-sectional view of an upper beam member provided in a platform door device according to a second modified example, shown in FIG. 2(C). [Figure 5] A configuration diagram showing the configuration around the end of the chain in the platform door device according to the third modified example, following FIG. 2(B). [Figure 6] FIG. 10 is a perspective view showing the configuration of the electric motor support frame and its surroundings provided in the platform door device according to the fourth modified example. [Figure 7] 7 is a perspective view of the motor support frame shown in FIG. 6, seen from another direction. [Figure 8] FIG. 8 is an explanatory diagram illustrating the configuration around the sprocket in the configuration shown in FIGS. 6 and 7. [Figure 9] An explanatory diagram illustrating another example of the configuration around the sprocket DETAILED DESCRIPTION OF THE INVENTION

[0011] The configuration and operation of a door device according to an embodiment of the present disclosure will be described in detail below with reference to the drawings. Note that the same reference numerals are used in each drawing to designate the same or equivalent parts.

[0012] (Platform door device) 1(A) and 1(B) are configuration diagrams showing the configuration of a platform door device 1 according to an embodiment of the present disclosure. Note that the platform door device 1 is an example of a door device according to the present disclosure.

[0013] As shown in Figures 1(A) and 1(B), the platform door device 1 comprises a fixed part 3 that is fixed to the platform 2 where the platform door device 1 is installed, and a door body 4 that is supported by the fixed part 3 so as to be able to move forward and backward via a linear rail (not shown) that is fixed to the fixed part 3. Note that Figure 1(A) shows a state in which the door body 4 is pulled out to the outside of the fixed part 3, closing the boarding and alighting passage (not shown). Figure 1(B) shows a state in which the door body 4 is pulled into the fixed part 3, opening the boarding and alighting passage.

[0014] As shown in FIG. 1(A), the fixed part 3 includes a lower cross beam 5 fixed to the platform 2 and an upper cross beam 6 arranged parallel to the lower cross beam 5. The upper cross beam 6 is fixed to two pillar members 7 fixed upright at both ends of the lower cross beam 5. Five fixed pipes 8 are arranged between the lower cross beam 5 and the upper cross beam 6. The fixed pipes 8 cross the pillar members 7 and are fixed to them. The fixed part 3 also includes a rotary motor 9 fixed to the fixed part 3 and a sprocket 10 that is driven to rotate by the rotary motor 9. A control device (not shown) that controls the platform door device 1 is attached to the fixed part 3. The rotary motor 9 operates under the control of the control device. The control device is controlled by a higher-level control device (not shown) that oversees multiple platform door devices.

[0015] As shown in FIG. 1(A), the door body 4 includes a lower beam member 11 and an upper beam member 12 spaced apart in the vertical direction, and a vertical member 13 located on the door-edge side of the door body 4 and connecting the lower beam member 11 and the upper beam member 12. Between the lower beam member 11 and the upper beam member 12, five horizontal bars 14—the same number as the fixed pipes 8—are arranged parallel to the lower beam members 11 and the upper beam members 12. The horizontal bars 14 are pipe-shaped members, and the ends of the horizontal bars 14 on the door-edge side are fixed to the vertical members 13. The ends of the horizontal bars 14 on the door-edge side are inserted into the fixed pipes 8. A sliding member (not shown) that slides against the inner surface of the fixed pipes 8 is attached to the ends of the horizontal bars 14 on the door-edge side. Because of this configuration, when the platform door device 1 is in the closed state, that is, when the platform door device 1 is in the state shown in FIG. 1(A), the horizontal bars 14 are pulled out of the fixed pipes 8. When the platform door device 1 is in the open state, that is, when the platform door device 1 is in the state shown in Figure 1(B), the crosspiece 14 is retracted into the fixed pipe 8. Also, as shown in Figure 1(A), a chain 15 is disposed below the upper beam member 12 and extends in the direction in which the door body 4 moves forward and backward. The sprocket 10 is engaged with the chain 15.

[0016] Fig. 2(A) is an enlarged view of the periphery of the upper beam member 12 shown in Fig. 1(A). Fig. 2(B) is an arrow view of the upper beam member 12 as seen from the direction indicated by arrow B in Fig. 2(A). Fig. 2(C) is a cross-sectional view of the upper beam member 12 cut along the plane indicated by line CC' in Fig. 2(A). Below, the detailed configuration of the periphery of the upper beam member 12 will be described with reference to Figs. 2(A) to 2(C).

[0017] As shown in FIG. 2(A), both ends of the chain 15 are connected to support members 16. As shown in FIG. 2(B), the support member 16 is fixed to the upper beam member 12 by two bolts 17. As shown in FIG. 2(C), a recess 18 is formed in the lower part of the upper beam member 12, recessed from the underside of the upper beam member 12, and the chain 15 is disposed inside the recess 18. A retaining member 19 is fitted into the gap between the upper beam member 12 and the chain 15 inside the recess 18. The retaining member 19 electrically insulates the chain 15 from the upper beam member 12. By providing the retaining member 19, leakage current flowing from the sprocket 10 to the chain can be prevented from flowing to the upper beam member 12 in the event of current leakage from the rotary motor 9. In this embodiment, the retaining member 19 is made of rigid polyvinyl chloride (PVC), but the material of the retaining member 19 is not limited to PVC.

[0018] Furthermore, the dashed dotted line in Figure 2(C) is a line that indicates the outline of the cross-sectional shape of the door body 4. The dashed dotted line marked with symbol FS is the outline corresponding to the outer surface of the front side of the door body 4, and the dashed dotted line marked with symbol BS is the outline corresponding to the outer surface of the back side of the door body 4. The dimension marked with symbol T corresponds to the thickness of the door body 4. In this way, the chain 15 and sprocket 10 are arranged inside the outline of the cross-sectional shape of the door body 4. Therefore, in the platform door device 1, there are no attachments that protrude from the back or front side of the door body 4. This makes it possible to reduce the overall thickness dimension of the door body 4, including the attachments.

[0019] 2(C), in this embodiment, the chain 15 is placed at the center of the thickness of the door body 4, and the cross section of the door body 4 is configured to be symmetrical. Therefore, the tension of the chain 15 acts on the structural center of the door body 4, so that an unbalanced load does not act on the door body 4. Therefore, the occurrence of warping of the door body 4 due to the tension of the chain 15 is suppressed.

[0020] Furthermore, in the state shown in FIG. 1(A), when the rotary motor 9 rotates the sprocket 10 clockwise, the door body 4 moves to the right in the figure, that is, in the direction approaching the fixed portion 3. As a result, the door body 4 moves to the position shown in FIG. 1(B). On the other hand, in the state shown in FIG. 1(B), when the rotary motor 9 rotates the sprocket 10 counterclockwise, the door body 4 moves to the left in the figure, that is, in the direction away from the fixed portion 3. As a result, the door body 4 moves to the position shown in FIG. 1(A). In this way, in the platform door device 1, the door body 4 can be moved forward and backward relative to the fixed portion 3 by operating the rotary motor 9 to rotate the sprocket 10.

[0021] Now, the door body 4 may be subjected to some kind of external force and displaced relative to the fixed part 3. For example, as shown in Figure 3, when the door body 4 displaces in the direction indicated by arrow D relative to the fixed part 3, the chain 15 also displaces in the direction indicated by arrow D. On the other hand, since the sprocket 10 does not displace relative to the fixed part 3, the chain 15 receives a reaction force F from the sprocket 10. In other words, the chain 15 is pushed back by the sprocket 10. Since the chain 15 is supported by the door body 4, the door body 4 is also pushed back by the sprocket 10.

[0022] In this way, in the platform door device 1, when the door body 4 is subjected to some external force and displaced to the right or left in Fig. 3, the door body 4 is pushed back in the opposite direction by the reaction force of the sprocket 10. Therefore, the displacement of the door body 4 is suppressed.

[0023] (First Modification) The platform door device 1 is not limited to one having a recess 18 in the lower part of the upper beam member 12 and having the chain 15 disposed inside the recess 18. For example, as shown in FIG. 4(A), the lower surface of the upper beam member 12 may be configured to be flat, a retaining member 19 may be fixed to the flat lower surface, and the chain 15 may be disposed inside the retaining member 19. The means for fixing the retaining member 19 to the upper beam member 12 is not limited. The retaining member 19 may be fixed to the upper beam member 12 by adhesive or screws. Alternatively, another member may be interposed between the retaining member 19 and the upper beam member 12.

[0024] (Second Modification) The platform door device 1 is not limited to one equipped with a retaining member 19. For example, as shown in FIG. 4(B), the retaining member 19 may not be disposed between the upper beam member 12 and the chain 15. In this case, insulating tape may be attached to the upper beam member 12.

[0025] (Third Modification) As shown in FIG. 5, a tension adjustment spring 20 may be provided on a support member 16 included in the platform door device 1. The support member 16 shown in FIG. 5 includes a fixed portion 21 fixed to the upper beam member 12, and a screw shaft 22 supported on the fixed portion 21 so as to be able to move back and forth. One end of the screw shaft 22 is connected to the chain 15, and a nut 23 is threadedly engaged with the other end of the screw shaft 22. A tension adjustment spring 20 is inserted into the screw shaft 22. The tension adjustment spring 20 is a coil spring that is sandwiched between the fixed portion 21 and the nut 23 and functions as a compression spring. A washer 24 is sandwiched between the tension adjustment spring 20 and the nut 23.

[0026] With the above-described configuration, tightening the nut 23 and compressing the tension adjustment spring 20 increases the tension acting on the chain 15. Loosening the nut 23 and extending the tension adjustment spring 20 decreases the tension acting on the chain 15. In this way, the support member 16 according to this modified example functions as tension adjustment means that increases or decreases the tension acting on the chain 15 as needed.

[0027] (Fourth Modification) Although the above describes an example in which the rotary motor 9 is directly attached to the fixed part 3, the platform door device 1 is not limited to one in which the rotary motor 9 is directly attached to the fixed part 3. As shown in Figures 6 and 7, the rotary motor 9 may be fixed to a motor support frame 26 via an adapter 25, and the motor support frame 26 may be fixed to the fixed part 3 (not shown in Figures 6 and 7).

[0028] As shown in Fig. 6, an adapter fixing bolt 27 is inserted into the adapter 25 from the rotary motor 9 side, and the adapter fixing bolt 27 is screwed into the motor support frame 26. In other words, the adapter 25 is fixed to the motor support frame 26 by the adapter fixing bolt 27. Also, as shown in Fig. 7, a motor fixing bolt 28 is inserted into the adapter 25 from the motor support frame 26 side, and the motor fixing bolt 28 is screwed into the end face of the load side of the rotary motor 9. In other words, the rotary motor 9 is fixed to the adapter 25 by the motor fixing bolt 28.

[0029] In this way, the rotary motor 9 is fixed to the adapter 25 by the motor fixing bolt 28, and the adapter 25 is fixed to the motor support frame 26 by the adapter fixing bolt 27. The adapter fixing bolt 27 is inserted into the adapter 25 from the anti-load side of the rotary motor 9. Therefore, the adapter fixing bolt 27 can be attached and detached by inserting a tool from the anti-load side of the rotary motor 9, making it easy to replace the rotary motor 9.

[0030] Maintenance of the platform door device 1 is performed by accessing the platform door device 1 from the platform 2 side. In this embodiment, the rotating motor 9 has its anti-load end facing the platform 2 side and is fixed to the motor support frame 26 via an adapter 25. Therefore, a tool can be inserted from the platform 2 side to access the adapter 25, the adapter fixing bolt 27 can be removed, and only the rotating motor 9 and the adapter 25 can be pulled out toward the platform 2 side while the motor support frame 26 remains fixed to the fixed part 3. In this way, in this embodiment, the adapter 25 is interposed between the rotating motor 9 and the motor support frame 26, making it easy to remove the rotating motor 9 from the fixed part 3. As a result, maintenance of the platform door device 1, particularly maintenance around the drive mechanism of the platform door device 1, is facilitated.

[0031] Furthermore, as will be described later, the motor support frame 26 is fixed to the fixed portion 3 by fixing bolts (not shown), so that it is easy to replace the rotating motor 9 and the motor support frame 26 together while the rotating motor 9 is fixed to the motor support frame 26.

[0032] 6 and 7, the motor support frame 26 is provided with a rotary bearing 29. As shown in Fig. 8, the sprocket 10 is provided with an extension shaft 10a extending on the opposite side of the rotary motor 9, and the extension shaft 10a is rotatably supported by the rotary bearing 29. Therefore, the sprocket 10 is supported at both ends by the output shaft 9a of the rotary motor 9 and the rotary bearing 29. As a result, the support rigidity of the sprocket 10 is increased, suppressing the generation of vibrations or abnormal noise during operation.

[0033] Furthermore, when the sprocket 10 is supported at both ends by the output shaft 9a of the rotary motor 9 and the rotary bearing 29, the bending load on the output shaft 9a is reduced, allowing the diameter of the output shaft 9a to be reduced. As a result, the external dimensions of the rotary motor 9 can be reduced. If the external dimensions of the rotary motor 9 can be reduced, it becomes easier to make the fixed part 3 smaller or thinner.

[0034] The motor support frame 26 may not include the rotary bearing 29. In this case, as shown in FIG. 9, the sprocket 10 is cantilevered by only the output shaft 9a of the rotary motor 9. If the configuration shown in FIG. 9 is selected, the shape of the sprocket 10 can be made relatively simple without the extension shaft 10a, thereby reducing the manufacturing cost of the sprocket 10. Furthermore, since the rotary bearing 29 is not required, the procurement cost of the rotary bearing 29 is also unnecessary. Therefore, if the configuration shown in FIG. 9 is selected, the cost of the platform door device 1 can be reduced.

[0035] 6 and 7, mounting holes 30 are drilled in the motor support frame 26. Mounting bolts (not shown) are inserted into the mounting holes 30 and screwed into female threads formed in the fixing part 3, thereby fixing the motor support frame 26 to the fixing part 3. The inner diameter of the mounting holes 30 is larger than the outer diameter of the mounting bolts, allowing for fine adjustment of the mounting position of the motor support frame 26.

[0036] In particular, in the platform door device 1, the relative positional relationship between the fixing part 3 and the door body 4 may become misaligned due to deformation over time of the floor surface of the platform 2. In such cases, the problem can be resolved by fine-tuning the mounting position of the motor support frame 26.

[0037] As explained above, in the platform door device 1, the chain 15 and sprocket 10 are arranged inside the cross-sectional contour of the door body 4, so the dimensions of the fixing part 3 are sufficient as long as they avoid interference with the door body 4. This allows the platform door device 1 to be configured compactly, allowing it to be installed in a narrow space.

[0038] If the support member 16 is provided with a tension adjustment spring 20, the tension acting on the chain 15 can be increased or decreased as needed. If a motor support frame 26 is provided and the rotary motor 9 and sprocket 10 are attached to the motor support frame 26, the rotary motor 9 and sprocket 10 can be attached and detached to the fixed part 3 together, making maintenance of the rotary motor 9 and sprocket 10 easy.

[0039] However, the technical scope of the present disclosure is not limited to the above-described embodiments, and the present disclosure can be freely applied, modified, or improved within the scope of the technical ideas described in the claims.

[0040] In the above embodiment, the platform door device 1 is taken up as a specific example of a door device, but the application of the present disclosure is not limited to door devices installed on platforms of railway stations. The present disclosure is widely applicable to automatic sliding door devices.

[0041] The specific mechanical configuration of the door device according to the present disclosure is not limited to the above-described embodiment. For example, the door device according to the present disclosure is not limited to a door body 4 having a lower beam member 11, an upper beam member 12, and a plurality of horizontal bars 14. For example, the entire door body 4 may be covered with a panel, and a recess may be provided on the side of the panel, and the chain 15 may be housed in the recess.

[0042] Furthermore, as in the above embodiment, if the chain 15 is positioned far from the floor of the platform 2, that is, at a high position on the door body 4, it is advantageous because it makes it difficult for dirt and grime on the floor of the platform 2 to adhere to the chain 15.

[0043] Furthermore, the height at which the chain 15 is attached to the door body 4 is not limited. Within the cross-sectional profile of the door body 4, the chain 15 may be located at a relatively high position or a relatively low position. Furthermore, the relative positions of the sprocket 10 and the chain 15 in relation to one another are not limited. The sprocket 10 may be located above the chain 15.

[0044] It is optional to make improvements to the mechanical configuration of the platform door device 1 shown in the above embodiment. For example, the shape and configuration of the motor support frame 26 shown in Figures 6 and 7 are exemplary and can be changed or improved as desired. In the platform door device 1, it is desirable to arrange the rotating motor 9 and motor support frame 26 inside the fixed part 3 so that they are accessible from the platform 2 side. This is because maintenance is easier if the rotating motor 9 and motor support frame 26 are accessible from the platform side.

[0045] In the above embodiment, the adapter 25 is interposed between the rotary motor 9 and the motor support frame 26, so that the adapter 25 can be accessed from the platform 2 side, and the rotary motor 9 can be removed from the fixed part 3 together with the adapter 25 while the motor support frame 26 remains fixed to the fixed part 3, and then pulled out toward the platform 2. Therefore, according to the above embodiment, the maintainability of the drive mechanism and its surroundings of the platform door device 1 is further improved. [Explanation of symbols]

[0046] 1 Platform door device, 2 Platform, 3 Fixed part, 4 Door body, 5 Lower cross beam, 6 Upper cross beam, 7 Pillar member, 8 Fixed pipe, 9 Rotating motor, 9a Output shaft, 10 Sprocket, 10a Extension shaft, 11 Lower beam member, 12 Upper beam member, 13 Vertical member, 14 Cross bar, 15 Chain, 16 Support member, 17 Bolt, 18 Recess, 19 Retaining member, 20 Tension adjustment spring, 21 Fixed part, 22 Screw shaft, 23 Nut, 24 Washer, 25 Adapter, 26 Motor support frame, 27 Adapter fixing bolt, 28 Motor fixing bolt, 29 Bearing, 30 Mounting hole.

Claims

1. a fixing part that is fixed to an installation location; a door body supported by the fixed portion so as to be able to move forward and backward; a chain stretched over the door body; a sprocket that is engaged with the chain; A door device including a rotary motor fixed to the fixed portion and rotating the sprocket, The door body includes a beam member extending parallel to the direction in which the door body advances and retreats, The beam member has a recess extending in a direction in which the door body moves forward and backward, The chain is disposed within the recess, and An electrically insulating retaining member is fitted into the gap between the beam member and the chain inside the recess. Door device.

2. A tension adjusting means is provided for adjusting the tension of the chain. The door device according to claim 1 .

3. a motor support frame fixed to the fixed portion and holding the rotary motor and the sprocket; The door device according to claim 1 or 2.

4. A fixing part that is fixed to an installation location; a door body supported by the fixed portion so as to be able to move forward and backward; a chain stretched over the door body; a sprocket that is engaged with the chain; A door device including a rotary motor fixed to the fixed portion and rotating the sprocket, The door body includes a beam member extending parallel to the direction in which the door body advances and retreats, The beam member has a recess extending in a direction in which the door body moves forward and backward, The chain is disposed within the recess, and a motor support frame fixed to the fixed portion and holding the rotary motor and the sprocket; Further, a rotary bearing is provided which is fixed to the motor support frame and rotatably supports the sprocket, The sprocket is supported at both ends by the output shaft of the rotary motor and the rotary bearing. Door device.

5. A fixing part that is fixed to an installation location; a door body supported by the fixed portion so as to be able to move forward and backward; a chain stretched over the door body; a sprocket that is engaged with the chain; A door device including a rotary motor fixed to the fixed portion and rotating the sprocket, The door body includes a beam member extending parallel to the direction in which the door body advances and retreats, The beam member has a recess extending in a direction in which the door body moves forward and backward, The chain is disposed within the recess, and a motor support frame fixed to the fixed portion and holding the rotary motor and the sprocket; an adapter fixed to the rotary motor and sandwiched between the rotary motor and the motor support frame; an adapter fixing bolt that is inserted into the adapter from the rotary motor side and is screwed into the motor support frame to fix the rotary motor and the adapter to the motor support frame; Door device.

Images