CN115940002A - Lifting device for an electrical switchgear and switchgear cabinet having such a lifting device - Google Patents

Abstract

The present disclosure relates to a lifting device for an electrical switchgear and to a switchgear cabinet having such a lifting device. The lifting device comprises: a base; a platform configured to carry an electrical switching apparatus; at least two pairs of support legs coupled to the platform and the base to support the platform on the base and configured to raise and lower the platform by moving in a horizontal direction; and a driving mechanism provided on the base and configured to drive the support leg to move in the horizontal direction via the transmission mechanism. Through this disclosure, can utilize actuating mechanism to realize electrical switchgear's lift process automatically under the condition that does not need manual operation, can conveniently carry out the lifting to improved the stability and the accuracy of lift, guaranteed reliably simultaneously that electrical switchgear can not drop at the lift in-process.

Description

Lifting device for electric switchgear and switchgear with the lifting device

5 technical fields

The present disclosure relates to the field of electric switchgear, in particular, to a lifting device for the electric switching device and a switchgear with the lifting device.

Background technique

It is known that electrical switching devices, such as circuit breakers, have moving contacts. In order to make the moving contact contact with the static contact of the switchgear, especially for heavy high-voltage circuit breakers, a lifting device design has appeared in recent years, in which the moving contact is gradually lifted along with the circuit breaker body, so that The moving contact approaches and finally touches the static contact fixedly arranged above. When the moving contact is separated from the static contact, the operation process is reversed.

5. There are many drawbacks in this lifting device at present. For example, current lifts are less stable and can only be operated manually. In the early stages of lifting, this requires a lot of operating force and limited accuracy.

Contents of the invention

The object of the present disclosure is to propose a new type of lifting device for electrical switchgear which at least partly solves the aforementioned problems of the prior art.

In order to achieve the above object, the lifting device for electric switchgear according to the present disclosure includes: a base; a platform configured to carry the electric switchgear;

The table and the base are coupled to support the platform on the base, and are configured to lift the platform by moving along the horizontal 5 direction; and a driving mechanism, which is arranged on the base, and is configured to drive the supporting legs via a transmission mechanism Move along the horizontal direction.

By adopting the lifting device according to the present disclosure, the driving mechanism can be used to automatically realize the lifting process of the electric switchgear without manual operation, the lifting can be conveniently carried out, and the stability and accuracy of lifting can be improved, and at the same time, Reliably guarantee that the electrical switchgear will not fall during the lifting process.

In one embodiment of the present disclosure, the transmission mechanism includes a worm and a worm gear that engage with each other, and the worm is connected with the driving mechanism to drive the worm gear to rotate. Since it is only possible to drive the worm gear by the worm, but not conversely, the worm can only be driven in one direction, so it can be reliably ensured that the electric switchgear will not fall during its lifting.

In one embodiment of the present disclosure, the transmission mechanism further includes a screw, which is connected to the worm wheel through an adapter, and has threads with opposite rotation directions on both sides. In this way, each pair of supporting legs on both sides of the screw can move in opposite directions with the rotation of the screw, thereby realizing the lifting and lowering of the platform.

In one embodiment of the present disclosure, the transmission mechanism further includes a connecting rod, and the screw rod is configured to pass through the connecting rod and be vertically arranged with the connecting rod, so that the screw rod is drivingly connected to the connecting rod. In this way, the rotational movement of the screw is converted into a translational movement of the connecting rod.

In one embodiment of the present disclosure, the transmission mechanism further includes a guide rod, which is parallel to the screw rod and passes through the end of the connecting rod, so that the connecting rod can move along the guide rod. The connecting rod is guided by the guiding rod, which improves the stability and accuracy of the connecting rod moving.

In one embodiment of the present disclosure, the supporting legs are scissor-shaped and include two legs hinged to each other, one leg of the two legs is fixedly connected to the base and the platform respectively, and the two legs The other of the legs is fixedly connected at one end to the platform and at the other end to the connecting rod. In this way, the rotating power of the screw is transmitted to the supporting legs through the connecting rod, so that the supporting legs are closed or opened, and then the lifting of the platform is realized.

In one embodiment of the present disclosure, the lifting device further includes a limiting mechanism configured to limit the lifting height of the platform. The limit mechanism includes: a first mechanical stop configured to mechanically limit the maximum lifting height of the platform; and a second mechanical stop configured to mechanically limit the minimum lowering height of the platform. The limit mechanism includes: a first electrical limit switch configured to electrically limit a maximum lifting height of the platform; and a second electrical limit switch configured to electrically limit a minimum lowering height of the platform. In this way, the maximum ascending height and the minimum descending height of the platform can be reliably controlled both mechanically and electrically.

In one embodiment of the present disclosure, the lifting device further includes a coil spring, which is sleeved on the second mechanical stop, and the length of the coil spring in a natural state is longer than that of the second mechanical stop. Through the coil spring, when the platform is lowered to touch the coil spring, the platform can be buffered, and in the early stage of platform lifting, the coil spring can exert an upward pre-jacking force on the platform, so that the platform can be lifted more conveniently. The required torque is reduced.

In one embodiment of the present disclosure, the electrical switching device is a circuit breaker, a contactor or a load switch. That is to say, the technical solutions of the present disclosure are not limited to be applicable to circuit breakers, but can also be applied to any other suitable components, such as contactors, load switches and the like.

According to another aspect, the present disclosure also relates to a switchgear comprising an electrical switchgear and a lifting device according to the preceding aspect. The aspects and advantages described above with respect to the lifting device are correspondingly also applicable to the switch cabinet according to the present disclosure, and the present disclosure will not be described in detail here.

Description of drawings

Other advantages and designs of the present disclosure are described in detail below with reference to the accompanying drawings, wherein:

Fig. 1 shows a schematic diagram of the assembly of a lifting device and a circuit breaker according to the present disclosure;

Figure 2 shows a perspective view of the lifting device according to the present disclosure at maximum lifting height;

Figure 3 shows a perspective view of the lifting device according to the present disclosure at minimum lowered height;

Figure 4 shows a partial perspective detail view of a lifting device according to the present disclosure; and

Figure 5 shows another partial perspective detail view of a lifting device according to the present disclosure showing bevel gears for manual manipulation.

Detailed ways

Corresponding numerals and symbols in the different figures generally refer to corresponding regions unless otherwise indicated. The figures are drawn to clearly illustrate the relevant aspects of the embodiments and are not necessarily drawn to scale. The edges of features drawn in the figures do not necessarily denote the end of the range of the feature.

In the ensuing description, various specific details are shown in order to provide a thorough understanding of various examples of embodiments according to the description. Embodiments may be obtained without one or more of the specific details, or with other methods, components, materials, etc. In other instances, known structures, materials, or operations are not shown or described in detail so as not to obscure aspects of the embodiments.

Reference to "an embodiment" or "one implementation" in the framework of this specification is intended to indicate that a specific configuration, structure, or characteristic described with respect to the embodiment is included in at least one embodiment. Thus, phrases such as "in an embodiment," "in one embodiment," etc. that may appear in various aspects of this specification do not necessarily refer to exactly the same embodiment. Furthermore, particular configurations, structures or characteristics may be combined in any suitable manner in one or more embodiments.

The headings/reference numbers used here are provided for the convenience of reading only, and thus do not limit the scope of protection or the scope of the embodiments. Identical or similar elements are identified with the same reference numerals.

In the electrical field, some electrical switchgear such as circuit breakers are raised and lowered by lifting devices, so that the moving contacts of the circuit breaker are in contact with or separated from the static contacts of the switch cabinet. However, because the weight of the circuit breaker is generally relatively large, there is a risk of falling during its lifting process, and a large operating force is required when operating the circuit breaker to lift it.

In order to solve the above problems, the present disclosure proposes to use a driving mechanism to drive the lifting device to automatically go up and down through a transmission mechanism. The transmission mechanism includes a worm and a worm gear meshed with each other, and the worm is connected with the driving mechanism to drive the worm gear to rotate. Due to the inherent transmission mechanism between the worm and the worm gear, the worm can only be driven by the worm, and the worm cannot be driven by the worm on the contrary. Therefore, the risk of the circuit breaker falling during the process of lifting and lowering with the lifting device is fundamentally eliminated, and the safety is significantly improved. The operation safety, stability and reliability are improved, and the operation accuracy is also improved.

The lifting device of the present disclosure will be described below exemplarily using the circuit breaker 200 as an electrical switchgear. However, it should be pointed out that the electrical switchgear may also be a contactor or a load switch. The present disclosure does not limit this.

FIG. 1 shows the assembled circuit breaker 200 and lifting device 100 . In one implementation, the circuit breaker 200 is, for example, a high voltage circuit breaker, and its weight is generally relatively large. The circuit breaker 200 has a protruding movable contact at its upper portion. In order to make these movable contacts contact with fixed static contacts (not shown) arranged above them, the lifting device 100 can be used to gradually lift the circuit breaker 200, so that the movable contacts approach and finally contact the static contacts. When the moving contact is separated from the stationary contact, the lifting device 100 is used to gradually lower the circuit breaker 200 in a reverse operation process.

FIG. 2 shows a perspective detailed view of the lifting device 100 . In Fig. 2, the lifting device 100 is at a maximum lifting height. The lifting device 100 comprises a base 2 with wheels 7 for easy movement. The base 2 is provided with a driving mechanism 4 and a transmission mechanism. The platform 1 is used to carry the circuit breaker 200 . The platform 1 here has, for example, two pairs (ie a total of four) of support legs 3 . The supporting legs 3 are supported on the base 2 , are coupled with the platform 1 and the base 2 , and can make the platform 1 lift up and down by moving horizontally along the base 2 . This horizontal movement is driven by the drive mechanism 4 . The driving mechanism 4 drives the supporting leg 3 to move horizontally along the base 2 through a transmission mechanism. The drive mechanism 4 is, for example, an electric motor or a hydraulic motor.

Referring to FIG. 4 and FIG. 5 , the transmission mechanism includes a worm 51 and a worm wheel 52 that mesh with each other. The worm 51 is connected with the driving mechanism 4, and the driving mechanism 4 drives the worm 51 to rotate, and the worm 51 drives the worm wheel 52 to rotate. In other words, the worm 51 transmits the power of the driving mechanism 4 to the worm wheel 52, and the worm wheel 52 is driven to rotate accordingly. In one embodiment, this power transfer is unidirectional. Specifically, the worm 51 drives the worm wheel 52 , but the worm 51 cannot be driven by the worm wheel 52 conversely. During the lifting of the platform 1 , the platform 1 is lifted due to the worm gear 52 driven by the worm 51 . But the following situation will not happen: for example, due to the failure of the driving mechanism 4 and the loss of power, the platform 1 will drop under the effect of its own weight, driving the worm wheel 52 to reverse, and then driving the worm 51. In this way, a reliable guarantee that the circuit breaker will not fall during its lifting can be achieved. When the driving mechanism 4 rotates in the reverse direction, the worm 51 drives the worm wheel 52 in the reverse direction correspondingly, so as to realize the lowering of the platform 1 .

With further reference to FIGS. 4 and 5 , the worm gear 52 is connected via an adapter 57 to a screw 54 having opposite-hand threads on both sides. In one embodiment, the screw 54 has two sections of approximately equal length with threads in opposite helical directions, as shown in FIG. 2 . As the screw rod 54 rotates, each pair of support legs 3 on both sides of the screw rod 54 moves in opposite directions, close together or diverge from each other, thereby realizing the lifting and lowering of the platform 1, which will be described in detail later.

The screw rod 54 passes through the connecting rods 53 at both ends, respectively, and is arranged perpendicularly to the two connecting rods 53 . The screw rod 54 cooperates with the nut 58, and the nut 58 is fixed on the connecting rod 53 by screws. Therefore, the connecting rod 53 utilizes the nut 58 fixed on it to cooperate with the screw rod 54 to generate a transmission connection between the connecting rod 53 and the screw rod 54 , so that the rotational movement of the screw rod 54 is transformed into the translational movement of the connecting rod 53 . As mentioned above, the screw 54 has oppositely-handed threads on two sections. Therefore, the two

The connecting rods 53 will move in translation opposite each other. That is, either they are close to each other, or 5 are far away from each other.

Referring to FIG. 2 , the connecting rod 53 is connected with guiding rods 55 at both ends thereof. The guide rod 55 passes through both ends of the connecting rod 53 and is parallel to the screw rod 54 . Two connecting rods 53 and two guiding rods 55 form a rectangle. Here, the movement of the guide rod 55 against the connecting rod 53

Guided so that the connecting rod 53 can move smoothly and accurately along the guide rod 55 . It can be seen from FIG. 2 that the fixing part 9 is arranged in the middle of the guide rod 55 . Because the guide rod 55 is relatively long, if the guide rod 55 is only fixed at both ends, it may cause the guide rod 55 to be bent and deformed in the middle during the working process, causing the middle part of the guide rod 55 to be out of center with its two ends, thereby damaging the guide rod 55. The guiding effect of the rod 55 on the connecting rod 53 . For this reason, adopt fixture 9 to fix guide rod 55 in the middle, can guarantee the concentricity of guide rod 55, guarantee the guiding action of guide rod 555 to connecting rod 53.

As shown in Figure 2, each supporting leg 3 has two legs hinged to each other, and the two legs form a scissors shape or an X shape, one of which is fixedly connected to the base 2 and the platform 1 respectively, while the other is fixedly connected to the base 2 and the platform 1 One leg is fixedly connected at one end to the platform 1 and at the other end to the

Rod 53 is connected. That is to say, a total of four legs are respectively connected at one end to the ends of the two connecting rods 530 . While four support legs are shown here with two legs each, this is illustrative only and does not limit the scope of the present disclosure. Other numbers of support legs and outriggers are also applicable, as long as they can be stably supported and raised and lowered.

It can be seen that the complete transmission chain includes: the drive mechanism 4 drives the worm 51 to rotate, the worm 51 drives the worm wheel 52 to rotate, the worm wheel 52 transmits power to the screw 54 via the adapter 57, and the rotation of the screw 54 is converted into two connecting rods 53 along the The translational movement of the guide rods 55 in opposite directions, and the translational movement of the connecting rods 53 drive the supporting legs 3 connected thereto to move together or apart along the base 2 , thereby realizing the lifting or lowering of the platform 1 . In the present disclosure, the driving mechanism 4 is used to automatically realize the lifting of the platform 1 , and then realize the lifting of the circuit breaker without manual operation.

In addition, the present disclosure is also provided with a manual operation mechanism, which consists of two paired bevel gears 56, see FIG. 5 . The two bevel gears 56 are usually enclosed in a housing, as shown in FIG. 4 . During manual manipulation, the operator can insert a screwing tool into the manual manipulation hole 8 to rotate the bevel gear 56 . The bevel gear 56 is connected with the worm 51 to drive the worm 51 . The worm 51 drives the worm wheel 52, and the subsequent process is the same as above. Since the worm gear 52 is driven by the worm 51, the required manipulation torque is reduced during manual manipulation, making the manual manipulation lighter and easier. It should be noted that manual manipulation and automatic manipulation using the driving mechanism 4 can only be selected from one of the two. That is, the two cannot be performed at the same time, which is not described in detail in this disclosure.

Referring to FIG. 2 , FIG. 4 and FIG. 5 , the lifting device 100 according to the present disclosure also has a limiting mechanism, which is used to limit the lifting height of the platform 1 . The limit mechanism includes a first mechanical stop 67 and a first electric limit switch 64 for limiting the maximum lifting height of the platform 1, and a second mechanical stop 65 and a second electric limit switch for limiting the minimum lowering height of the platform 1 Switch 62. In one implementation, the first mechanical stopper 67 and the second mechanical stopper 65 mechanically limit the lifting height of the platform 1, while in another implementation, the first electric limit switch 64 and the second electric limit switch The position switch 62 limits the lifting height of the platform 1 in an electronically controlled manner.

Specifically, the first mechanical stopper 67 is fixedly installed on the base 2 through the fixing block 68 so as to face the connecting rod 53 horizontally. Of course, the fixed block can also be directly used as the first mechanical stop, the second mechanical stop 65 is fixedly installed on the platform 2 vertically facing the platform 1, and the first trigger 63 is provided on the connecting rod 53, A second trigger 61 is arranged on the platform 1 . When the platform 1 rises to a certain level, the two supporting legs of the supporting leg 3 are brought together, and the connecting rod 53 connected with one supporting leg 3 will lean against the first mechanical stopper 67 . In other words, the connecting rod 53 is blocked by the first mechanical stopper 67, and at the same time, the first trigger 63 on the connecting rod 53 will touch the first electrical limit switch 64 to cut off the related circuit, so that the platform 1 loses its upward power. The maximum lifting height of the platform 1 is thus reliably limited mechanically and electrically. On the contrary, when the platform 1 descends to a certain degree, the platform 1 will be pressed against the second mechanical stop 65, that is to say, blocked by the second mechanical stop 65, and the second trigger 61 on the platform 1 will touch Touch the second electric limit switch 62 to cut off the relevant circuit, so that the platform 1 loses the power to descend. The minimum lowering height of the platform 1 is thereby reliably limited mechanically and electrically.

In addition, as shown in FIG. 2 , FIG. 4 and FIG. 5 , a coil spring 66 is sleeved on the second mechanical stopper 65 . The coil spring 66 is longer than the second mechanical stopper 65 in a natural state. Thus, when the platform 1 descends to contact the coil spring 66 at first, the platform 1 can be buffered by the coil spring 66, and then the platform 1 will continue to descend and be pressed against the second mechanical stopper 65, while At the initial stage of lifting the platform 1 , since the coil spring 66 has been compressed to a certain extent, it can exert an upward pre-jacking force on the platform 1 , so that the lifting of the platform is more convenient and the required torque is reduced.

The lifting device of the present disclosure has been introduced above by using the circuit breaker 200 as an example of the electrical switchgear. However, it should be pointed out that the lifting device of the present disclosure is not limited to be applied to the circuit breaker 200, and can also be applied to any other suitable electrical switching equipment, such as contactors, load switches, etc., that is, the electrical switching equipment can be the circuit breaker 200, contactor or load switch, etc. The present disclosure does not limit this.

According to another aspect, the present disclosure also relates to a switchgear having an electrical switching device such as a circuit breaker 200 and a lifting device 100 for an electrical switching device such as a circuit breaker 200 according to the preceding aspect. The aspects and advantages described above with respect to the lifting device 100 are correspondingly also applicable to the switchgear according to the present disclosure, and the present disclosure will not be repeated here.

Many modifications and other implementations of the disclosure presented herein will come to mind to one skilled in the art to which this disclosure pertains from the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the embodiments of the present disclosure are not to be limited to the particular embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the present disclosure. Additionally, while the above description and associated drawings describe example embodiments in the context of certain example combinations of components and/or functions, it should be appreciated that components and/or functions may be provided by alternative embodiments. Different combinations of functions can be made without departing from the scope of the present disclosure. In this regard, for example, other combinations of components and/or functions than those expressly described above are also contemplated to be within the scope of the present disclosure. Although specific terms are employed herein, they are used in a generic and descriptive sense only and are not intended to be limiting.

Claims (13)

1. A lifting device (100) for an electric switchgear, comprising: Base (2); a platform (1) configured to carry said electrical switchgear; At least two pairs of support legs (3), coupled with the platform (1) and the base (2) to support the platform (1) on the base (2), and configured to pass along moving in the horizontal direction causes the platform (1) to go up and down; and The driving mechanism (4) is arranged on the base (2), and is configured to drive the supporting leg (3) to move along the horizontal direction via a transmission mechanism. 2. The lifting device (100) according to claim 1, wherein the transmission mechanism comprises a worm (51) and a worm wheel (52) meshing with each other, and the worm (51) is connected with the drive mechanism (4) To drive the worm wheel (52) to rotate. 3. The lifting device (100) according to claim 2, wherein the transmission mechanism further comprises a screw (54), the screw (54) is connected with the worm wheel (52) through an adapter (57), and Both sides have opposite-handed threads. 4. The lifting device (100) according to claim 3, wherein the transmission mechanism further comprises a connecting rod (53), and the screw rod (54) is configured to pass through the connecting rod (53) and connect with the The connecting rod is arranged vertically, so that the screw rod (54) is drivingly connected with the connecting rod (53). 5. The lifting device (100) according to claim 4, wherein the transmission mechanism further comprises a guide rod (55), the guide rod (55) is parallel to the screw rod (54) and passes through the The ends of the connecting rods (53) are connected so that the connecting rods (53) can move along the guide rods (55). 6. The lifting device (100) according to claim 4, wherein the supporting leg (3) is scissor-shaped and includes two legs hinged to each other, one leg in the two legs is fixed respectively ground connected to the base (2) and the platform (1), and the other leg of the two legs is fixedly connected to the platform (1) at one end and to the platform (1) at the other end. Connecting rod (53) connects. 7. The lifting device (100) according to any one of claims 1 to 6, further comprising: The limit mechanism is configured to limit the lifting height of the platform (1). 8. The lifting device (100) according to claim 7, wherein the limit mechanism comprises: a first mechanical stop (67), configured to mechanically limit the maximum lifting height of said platform (1); and A second mechanical stop (65), configured to mechanically limit the minimum lowering height of said platform (1). 9. The lifting device (100) according to claim 8, further comprising: A coil spring (66) is sleeved on the second mechanical stop (65), and the length of the coil spring (66) in a natural state is longer than that of the second mechanical stop (65). 10. The lifting device (100) according to claim 7 or 8, wherein the limit mechanism comprises: a first electrical limit switch (64) configured to electrically limit the maximum lifting height of said platform (1); and A second electrical limit switch (62), configured to electrically limit the minimum lowered height of said platform (1). 11. The lifting device (100) according to claim 1, wherein the electrical switching device is a circuit breaker (200), a contactor or a load switch. 12. A switchgear, comprising: electrical switchgear; and The lifting device (100) according to any one of claims 1-11. 13. The switchgear according to claim 12, wherein the electrical switching device is a circuit breaker (200), a contactor or a switch-disconnector.

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