INSERTION AND REMOVAL DEVICE FOR A MOVABLE DEVICE AND ELECTRICAL DEVICE

Abstract

Insertion and removal device (50) for movable device (7), comprising: a frame (6) on which a movable device (7) is placed; Links (3a, 3b, 5a, 5b) which movably hold the frame (6) at one end of the links (3a, 3b, 5a, 5b) and which have a worm wheel portion (3c) formed at the other end of the links (3a, 3b, 5a, 5b); a worm thread (2b) which meshes with the worm wheel portion (3c) of the links (3a, 3b, 5a, 5b) and which rotates the worm wheel portion (3c); and a rotating device connected to an actuating shaft (2a) of the worm screw (2b) and rotating the worm wheel portion (3c), wherein the movable device (7) is a circuit breaker or a power supply transformer.

Description

Technical area

[0001] The present invention relates to an insertion and removal device for a movable device, and an electrical device. State of the art

[0002] Conventionally, for example, an insertion and removal operation for a movable device (a circuit breaker, a switch, a disconnector, a power supply transformer, or the like) in a switchgear has been performed using a lead screw mechanism that moves a nut linearly along a lead screw by rotating the lead screw (see, for example, Patent Literatures 1 and 2).

[0003] A conventional insertion and removal mechanism disclosed, for example, in Patent Literature 1 described above includes: a carriage on which a circuit breaker body coupled to or detached from a mounting jig provided behind a jig is relocatably mounted; an insertion and retraction handle for moving the carriage back and forth; a brake device for limiting a relocating distance of the carriage moved by the insertion and retraction handle; and a beam assembly for supporting the insertion and retraction handle.Further, the cart comprises: a box body having an open upper portion and a wall body having a predetermined height formed on its outer peripheral surface; and two pairs of wheels provided on both sides of the box body to be inserted or retracted along guide rails installed inside both side walls of the frame.

[0004] The insertion and withdrawal handle includes: the lead screw inserted in a forward-backward direction into a through hole formed in a front wall body of the box body; a conversion nut provided inside the front wall body of the box body while being screwed onto the lead screw; a "U"-shaped holder fixed to the box body to prevent removal of the conversion nut; and an operation handle detachably provided at a front end so that the lead screw can be rotated forward and backward.

[0005] As described above, the conventional insertion and removal mechanism performs the insertion and removal operation of the device using a mechanism in which the nut is moved linearly along the lead screw by rotating the lead screw. The reason why this mechanism is often used is that by using the lead screw and the nut, it is possible to relatively easily implement a deceleration function and generate direct pressure when converting a rotational actuation force into a direct movement.

[0006] During a process of moving the movable device into and out of the switchgear, the pressure required to insert a contact plug of an electrical switch contact is maximized near a final insertion position during a movement process. Specifications of the lead screw, a diameter of the transfer nut, and a thread pitch are determined based on this maximum pressure. Citation listPatent literature Patent literature 1: JP 2011 010 544 A Patent literature 2: JP 2013 150 375 A Patent literature 3: DE 893 362 B Summary of the inventionTechnical problem

[0007] However, during the retraction and retraction process of the movable device, the pressure required for the movement involves rolling resistance due to the weight of the movable device, which may be much smaller than the above-mentioned maximum pressure. Therefore, the conventional insertion and removal mechanism wastefully uses a deceleration ratio of the lead screw, which poses an obstacle to reducing the number of operations and operation time, resulting in a problem in saving labor during the insertion and removal process.

[0008] In addition, since a lead screw length greater than or equal to a moving distance of the movable device is required, a depth dimension of the insertion and removal mechanism is determined, and since a dimension in a height direction of the insertion and removal mechanism is limited by an outer dimension of the nut associated with a lead screw diameter, there is a limit to miniaturization of the device, and there is a problem that the dimensions and weight cannot be reduced.

[0009] The present application has been made to solve the above-mentioned problems, and an object of the present application is to provide the insertion and removal device for a movable device which can reduce an insertion and removal force, the number of operations and the operation time, and which can be downsized, and the electric device. Means of solving the problem

[0010] This object is achieved by an insertion and removal device for a movable device according to claim 1.

[0011] Furthermore, an electrical device disclosed in the present application uses the insertion and removal device for a movable device. Advantage of the invention

[0012] The insertion and removal device for a movable device and the electrical device disclosed in the present application can achieve the insertion and removal device for a movable device that reduces an insertion and removal force, the number of operations and the operation time and that can be downsized, and the electrical device. Short description of the drawings Fig. 1 is a perspective view illustrating a movable device insertion and removal device according to the first embodiment. Fig. 2 is a perspective view illustrating the movable device insertion and removal device according to the first embodiment. Fig. Figure 3 is a perspective view showing a housing of the insertion and removal device for a movable device used in Fig. 1 is not shown. Fig. Figure 4 is a side view of the insertion and removal device for a movable device shown in Fig. 3 is illustrated. Fig. Figure 5 is a front view of the insertion and removal device for a movable device shown in Fig. 3 is illustrated. Fig. Figure 6 shows a cross-sectional view along a line AA in Fig. 1. Fig. Figure 7 shows a perspective view of the Fig. 6. Fig. 8 is a perspective view illustrating a state where the movable device is placed on the movable device insertion and removal device according to the first embodiment and is inserted into a switchgear. Fig. 9 shows a side view of the Fig. 8. Fig. 10 is a graph comparing a deceleration ratio (force ratio) when the insertion and removal device for a movable device according to the first embodiment and a conventional device are used. Fig. 11 is a perspective view illustrating the movable device insertion and removal device according to the second embodiment. Fig. 12 is a partially enlarged view of the movable device insertion and removal device according to the third embodiment. Fig. 13A illustrates a partial plan view of the movable device insertion and removal device according to the fourth embodiment. Fig. 13B illustrates a partial front view of the movable device insertion and removal device according to the fifth embodiment. Mode for carrying out the invention

[0013] Hereinafter, the first embodiment will be described with reference to the drawings.

[0014] In each of the drawings, the same reference numerals designate the same or equivalent components. First embodiment

[0015] Fig. 1 and Fig. 2 are perspective views illustrating a movable device insertion and removal device according to the first embodiment. Fig. Fig. 1 illustrates the insertion and removal device for a movable device in a state where the movable device is pulled out from a moving target such as a switchgear, and Fig. 2 illustrates the movable device insertion and removal device in a state where the movable device is inserted into the movement target such as the switchgear.

[0016] Fig. Fig. 3 is a perspective view illustrating an internal structure of the movable device insertion and removal device shown in Fig. 1, the housing not being shown. Furthermore, Fig. 4 is a side view of the insertion and removal device for a movable device shown in Fig. 3 is illustrated, and Fig. Figure 5 is a front view of the insertion and removal device for a movable device shown in Fig. 3 is illustrated.

[0017] In the first embodiment, the movable device insertion and removal device that inserts or withdraws an electrical device as a movable device into or from the switchgear, the electrical device being housed in the switchgear used in a power distribution and reception apparatus, is described with reference to the Fig. 1 to 3. Here, the electrical device refers to a circuit breaker, a switch, a disconnect switch, a power supply transformer, or the like.

[0018] In the Fig. 1 to 3, a movable device insertion and removal device 50 comprises: a housing 1; a worm gear 2b rotatably supported by the housing 1; worm gear members 3a and 3b each having at their ends worm gear portions 3c and 3d that mesh with the worm gear 2b; connecting members 5a and 5b connected to the respective worm gear members 3a and 3b; and a movable frame 6 coupled to the connecting members 5a, 5b.

[0019] An operating shaft 2a, provided at one end of the worm gear 2b, engages with an operating handle (not shown) mounted thereon when a movable device 7, such as a circuit breaker, is withdrawn from or inserted into the switchgear. The worm gear 2b and the worm gears of the worm gear sections 3c and 3d form a worm gear 2.

[0020] The worm gear members 3a and 3b are rotatably mounted about pins 4a and 4b, which serve as rotation support shafts. The respective worm gear portions 3c and 3d are formed at ends of the worm gear members 3a and 3b and engage with a threaded portion of the worm thread 2b. Each end of the connecting member 5a and 5b is rotatably connected to the respective worm gear member 3a and 3b via a pin. The other ends of the connecting members 5a and 5b are rotatably connected to the movable frame 6 via connecting pins 5c and 5d. The worm gear members 3a and 3b, the connecting members 5a and 5b, and the movable frame 6 constitute a pantograph member.

[0021] The movable frame 6 forms a movable end of the current collector, and the movable device 7, such as the circuit breaker, which is brought into and out of the switchgear (not shown), is placed thereon. A fastening-side locking member 8, provided in the housing 1, fastens the housing 1 to, for example, the switchgear. The housing 1 accommodates and supports the worm thread 2b and the worm gear portions 3c and 3d of the worm gear members 3a and 3b. The teeth of the worm gear portions 3c and 3d have a three-dimensional curved surface structure.

[0022] Fig. Figure 6 is a cross-sectional view taken along a line AA of the Fig. 1. Fig. Figure 7 shows a perspective view of the Fig. 6. Fig. 8 is a perspective view illustrating a state where the circuit breaker is mounted on the movable device insertion and removal device according to the first embodiment and is inserted into the switchgear (not shown). Fig. 9 shows a side view of the Fig. 8.

[0023] As in Fig. 6, the movable frame 6 has a structure in which the ends of the connecting members 5a and 5b are arranged between two plates, and the movable frame 6 and the ends of the connecting members 5a and 5b are rotatably connected by the connecting pins 5c and 5d. As shown in Fig. 7, a through hole 6a is formed in the movable frame 6, and a bolt (not shown) is inserted through the through hole 6a from below the movable frame 6 to fix the movable device 7 such as the circuit breaker.

[0024] In the first embodiment, as shown in the Fig. 8 and Fig. 9, an example is illustrated in which the movable device 7 such as the circuit breaker is fixed to four through holes 6a with four bolts, however, the number of through holes 6a is not limited thereto and can be selected in an appropriate manner.

[0025] As in Fig. As illustrated in Fig. 7, the movable frame 6 is formed with a square extra hole 6b. This is intended to reduce the weight of the movable frame 6. In the first embodiment, an example in which four extra holes 6b are formed was illustrated, but the number of extra holes 6b can also be appropriately selected.

[0026] Next, an operation will be described. By inserting the operating handle (not shown) onto the operating shaft 2a of the worm gear 2b and rotating the worm gear 2b, power is transmitted to the worm gear portions 3c and 3d of the worm gear members 3a and 3b arranged on both sides of the worm gear 2b. When the worm gear members 3a and 3b rotate around the pins 4a and 4b, which are rotation support shafts, in directions approaching each other, the pantograph member extends in a depth direction of the switchgear, and pressure is transmitted from the connecting links 5a and 5b to the movable frame 6 in the depth direction of the switchgear. As a result, the movable device 7, such as the circuit breaker, mounted on the movable frame 6, can be moved in a forward-backward direction (straight direction) of the switchgear.

[0027] By rotating the operating shaft 2a of the worm gear 2b in a direction opposite to that mentioned above, the worm gear members 3a and 3b rotate in directions away from each other, and the pantograph member comprising the worm gear members 3a and 3b, the connecting members 5a and 5b, and the movable frame 6 are retracted in the depth direction of the switchgear, so that the movable device 7, such as the circuit breaker, mounted on the movable frame 6 can be pulled out to its original position (pull-out position).

[0028] As described above, in the insertion and removal operation of the circuit breaker constituting the movable device 7, a force required mostly in a moving operation depends on a rolling resistance due to a weight of the movable device 7 (rolling resistance of wheels supporting the movable device 7).

[0029] The rolling resistance is much smaller than the required pressure or actuation force when a mechanical or electrical connection is required in a final insertion area A, which represents a final insertion position. Here, the final insertion position is a position where the movable device 7 is connected to a main circuit in the switchgear. The mechanical force refers to a mechanical force required to connect electrical connectors connecting the movable device 7 and the main circuit when the movable device 7 is connected to the main circuit in the switchgear.

[0030] The movable device insertion and removal device 50 according to the first embodiment can utilize a variable force doubling function through a toggle mechanism in the pantograph link to maximize the deceleration ratio in accordance with the final insertion range A where the pantograph link is fully extended. Therefore, the operating force of the movable device insertion and removal device 50 can be utilized without wastage, the number of operations can be reduced, and labor savings in the operation can be realized.

[0031] Fig. Fig. 10 is a graph illustrating a change in the deceleration ratio (force ratio) when the movable device insertion and removal device according to the first embodiment is used, compared to the deceleration ratio (force ratio) when a conventional device (lead screw structure) is used. This means that the Fig. 10 is a graph illustrating a feature of the toggle principle of the pantograph described above. This means that, as characteristics of the pantograph member, at the start of extension from a contracted state, a movement of the movable frame 6 is large relative to a rotational amount of the worm gear members 3a and 3b, and the deceleration ratio is small, and thus the generated pressure is small. However, a movement amount relative to the rotational amount of the worm gear members 3a and 3b is reduced, and the deceleration ratio is increased toward a final position, so that a large pressure can be generated at an efficient deceleration ratio. Therefore, the movable device insertion and removal device 50 according to the first embodiment can be operated with a small number of rotations without loss.

[0032] In the movable device insertion and removal device 50 according to the first embodiment, since constituent members of the pantograph member can be formed by a thin plate made of a processed sheet, the entire movable device insertion and removal device 50 can be reduced in thickness and formed with a reduced height.

[0033] Furthermore, in a conventional lead screw structure, a jig size corresponding to a moving distance for insertion and removal in an insertion and removal direction is required. However, in the movable device insertion and removal jig 50 of the first embodiment, since the movable device 7 is moved by contraction of the pantograph member, the jig size corresponding to the insertion and removal moving distance is not required.

[0034] Furthermore, a restriction in the height direction due to an outer dimension of the nut associated with a lead screw diameter, which is required in the conventional lead screw structure, is not required in the movable device insertion and removal device 50 according to the first embodiment. Therefore, the movable device insertion and removal device 50 according to the first embodiment can be reduced in size or weight compared to the conventional device. Second embodiment

[0035] Fig. 11 is a perspective view illustrating the movable device insertion and removal device according to the second embodiment.

[0036] Hereinafter, the movable device insertion and removal device 50 according to the second embodiment will be described with reference to Fig. 10 are described.

[0037] As in Fig. 11, the movable device insertion and removal device 50 according to the second embodiment is provided with a member formed by the connecting member 5a and the worm gear member 3a on only one side of the movable frame 6.

[0038] In the second embodiment, the movable device insertion and removal device 50, like the first embodiment, includes the housing 1, the worm gear 2b rotatably supported by the housing 1, the worm gear member 3a having at its end the worm gear portion 3c meshing with the worm gear 2b, the connecting member 5a connected to the worm gear member 3a, and the movable frame 6 coupled to the connecting member 5a. The operating shaft 2a provided at one end of the worm gear 2b engages with the operating handle (not shown) mounted thereon when the movable device 7, such as the circuit breaker, is withdrawn from or inserted into the switchgear.

[0039] The worm gear member 3a is rotatably mounted around a pin 4a, which serves as a rotation support shaft. The worm gear portion 3c is formed at one end of the worm gear member 3a and engages with the threaded portion of the worm screw 2b. One end of the connecting member 5a is rotatably connected to the worm gear member 3a via a pin. The other end of the connecting member 5a is rotatably connected to the movable frame 6 via a connecting pin 5c.

[0040] The movable frame 6 is connected to the movable device 7, such as the circuit breaker, which is inserted into or withdrawn from the switchgear (not shown). The housing 1 accommodates and supports the worm gear 2b and the worm gear portion 3c of the worm gear member 3a.

[0041] In the movable device insertion and removal device 50 according to the second embodiment, a linear motion guide 9 of the movable device 7 is provided in contact with the movable frame 6. The linear motion guide 9 is fixed to, for example, the switchgear and is used by sliding the movable frame 6. When the linear motion guide 9 of the movable device 7 is provided, the mechanism does not need to be a pantograph link mechanism; however, a movement function for inserting and removing the movable device 7 may be formed by, for example, a link structure including only the worm gear link 3a and the link link 5a on the right side. In the second embodiment, the same effect as in the first embodiment can be obtained, and the function can be realized with a fewer number of components. Third embodiment

[0042] Fig. 12 is a partially enlarged view of the movable device insertion and removal device according to the third embodiment. Next, the movable device insertion and removal device 50 according to the third embodiment will be described with reference to Fig. 12. In the movable device insertion and removal device 50 according to the third embodiment, the worm gear member 3a is offset from the worm gear member 3b by half a pitch P, but the structure other than the above-mentioned feature is the same as that of the first embodiment.

[0043] When the worm gear members 3a and 3b are arranged on both sides of the worm thread 2b, there is a displacement of a thread engagement portion corresponding to half a turn due to a pitch twist of the worm thread 2b. An arrangement of the worm gear members 3a and 3b is accordingly displaced by half a turn, that is, by half the pitch P. This means that a rotational axis of the worm gear member 3a provided on one side of the worm thread 2b is displaced from a rotational axis of the worm gear member 3b provided on the other side of the worm thread 2b by half the pitch P of the worm gear 2b.

[0044] Together with this, the connecting links 5a and 5b are also connected to the movable frame 6 with an offset of half the thread pitch P, so that the same links can be used on the left and right, and it is possible to provide a relatively reliable insertion and removal device 50 for a movable device, so that the number of types of components can be reduced and assembly errors can be prevented by using the left and right links together. Fourth embodiment

[0045] Fig. 13A illustrates a partial plan view of the movable device insertion and removal device according to the fourth embodiment. Fig. 13B shows a partial front view of the movable device insertion and removal device according to the fourth embodiment. In the first to third embodiments, the teeth of the worm gears 3c and 3d of the worm gear members 3a and 3b have a three-dimensional curved surface shape. However, in the fourth embodiment, the teeth of the worm gears 3c and 3d are formed by spur gears 10 with a two-dimensional curved surface shape instead of the three-dimensional curved surface shape.

[0046] When the worm gears 3c and 3d are thinly formed, for example, by sheet metal processing, it is possible to prevent interference other than a regular transmission contact surface due to pitch angle distortion of the worm thread 2b, even if a spur gear shape is used instead of a worm gear shape. Therefore, it is possible to use the spur gear 10 formed by an inexpensive processing method such as stamping or laser processing, thereby providing the insertion and removal device 50 for a movable device, which is cheaper and more suitable for mass production. Fifth embodiment

[0047] In the movable device insertion and removal device 50 according to the first to fourth embodiments, a surface hardness of the worm gears 3c and 3d of the worm gear members 3a and 3b is formed lower than that of the threaded portion of the worm thread 2b.

[0048] When the device is used at a high pressure, the surface hardness of the worm gears 3c and 3d is designed to be lower than that of the worm screw 2b, so that a mechanism that can withstand a large operating force and that generates a large driving force can be formed compactly without causing damage or breakage due to cold welding (seizing) or the like.

[0049] When the transmission contact surfaces of the worm gears 3c and 3d are used under such a large surface pressure that plastic deformation occurs beyond an elastic deformation range, the worm gears 3c and 3d are plastically deformed earlier than a contact surface of the worm screw 2b, which is to be deepened along a shape of a contact portion with the worm gear 2b, so that self-expansion occurs from an original point contact state through line contact to area contact. Thus, the mechanism capable of withstanding the large actuating force and generating the large driving force can be formed compactly without causing damage or breakage due to cold welding or the like.

[0050] The movable device insertion and removal device 50 according to the second to fifth embodiments also shows that the change of the deceleration ratio (force ratio) is the same as in the first embodiment shown in Fig. 10. Therefore, the movable device insertion and removal device 50 according to the second to fifth embodiments can be operated without loss even with a small number of revolutions.

[0051] In the first to fifth embodiments described above, an example was described in which the device is applied to the electrical device accommodated in the switchgear so that it can be pulled out. However, an application target is not limited to the electrical device, but the movable device insertion and removal device 50 disclosed in the first to fifth embodiments of the present application can be applied to any device that is moved in the front-back direction when viewed from an operating position.

[0052] Although the present application describes various exemplary embodiments and implementations, it should be understood that the various features, aspects, and functionality described in one or more of the individual embodiments are not limited in their applicability to the embodiment with which they are described, but instead may be applied alone or in other combinations to one or more of the embodiments.

[0053] It is therefore understood that numerous modifications not illustrated by way of example may be devised without departing from the scope of the present application. For example, at least one of the constituent components could be modified, added, or eliminated. At least one of the constituent components in at least one of the preferred embodiments could be selected and combined with the constituent components mentioned in another embodiment. Description of reference numbers and symbols

[0054] 1: Housing, 2: Worm gear, 2a: Actuating shaft, 2b: Worm thread, 3a, 3b: Worm wheel link, 3c, 3d: Worm wheel section, 4a, 4b: Pin, 5a, 5b: Connecting link, 5c, 5d: Connecting pin, 6: Movable frame, 6a: Through hole, 6b: Extra hole, 7: Movable device, 8: Fixing side locking link, 9: Linear motion guide, 10: Spur gear, 50: Movable device insertion and removal device.

Claims

An insertion and removal device (50) for a movable device (7), comprising: a frame (6) on which a movable device (7) is placed; links (3a, 3b, 5a, 5b) that movably support the frame (6) at one end of the links (3a, 3b, 5a, 5b) and that have a worm gear portion (3c) formed at the other end of the links (3a, 3b, 5a, 5b); a worm screw (2b) that meshes with the worm gear portion (3c) of the links (3a, 3b, 5a, 5b) and that rotates the worm gear portion (3c); and a rotating device that is connected to an actuating shaft (2a) of the worm screw (2b) and that rotates the worm gear portion (3c), wherein the movable device (7) is a circuit breaker or a power transformer. Insertion and removal device (50) for a movable device (7) according to claim 1, wherein the members (3a, 5a; 3b, 5b) are respectively provided on both sides of the worm thread (2b) and form a pantograph member together with the frame (6). Insertion and removal device (50) for a movable device (7) according to claim 1, wherein a linear movement guide (9) for the movable device (7) is provided on one side of the frame (6). An insertion and removal device (50) for a movable device (7) according to claim 1 or 2, wherein a rotation axis of the member (3a, 3b, 5a, 5b) provided on one side is offset from a rotation axis of the member (3a, 3b, 5a, 5b) provided on the other side by half a thread pitch of the worm thread (2b). Insertion and removal device (50) for a movable device (7) according to one of claims 1 to 4, wherein a surface hardness of the worm wheel portion (3c) is lower than the surface hardness of the worm thread (2b). Insertion and removal device (50) for a movable device (7) according to one of claims 1 to 5, wherein the worm gear section (3c) is formed by a spur gear (10). An insertion and removal device (50) for a movable device (7) according to any one of claims 1 to 6, wherein the movable device (7) is a movable device (7) that is inserted into a switchgear or that is withdrawn from the switchgear, and the frame (6) moves in an insertion direction or a withdrawal direction of the movable device (7). An electrical device using the insertion and removal device (50) for a movable device (7) according to any one of claims 1 to 7.

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