A secondary protection shielding device for a vacuum circuit breaker

Abstract

The present invention discloses a secondary protection shielding device for a vacuum circuit breaker, which includes a vacuum circuit breaker body. The vacuum circuit breaker body includes a secondary protection shielding instrument, and an opening and closing handle is arranged on one side of the secondary protection shielding instrument. One side of the vacuum circuit breaker body is bolted with a driving mechanism, and the driving mechanism is used to drive the opening and closing of the opening and closing handle. A connecting mechanism is arranged on the driving mechanism, and the connecting mechanism is used to connect with the opening and closing handle; the driving mechanism includes an arc-shaped limiting guide rail, and a T-shaped fixing frame is fixedly connected to one side of the arc-shaped limiting guide rail. The T-shaped fixing frame is bolted to one side of the secondary protection shielding instrument. The connecting mechanism is movably connected in the arc-shaped limiting guide rail, and buffer mechanisms are respectively connected to both ends of the arc-shaped limiting guide rail. The secondary protection shielding device for the vacuum circuit breaker disclosed by the present invention has the effect of automatically opening and closing the device according to the opening and closing requirements of the secondary protection shielding device.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum circuit breakers, and particularly to a secondary protection shielding device for a vacuum circuit breaker. Background Art

[0002] The secondary protection structure of a vacuum circuit breaker mainly includes the interlock between the trolley position and the earthing switch, the interlock between the trolley position and the secondary plug, and the interlock between the earthing switch and the cable chamber cover plate. These structures ensure the safe operation and correct operation of the vacuum circuit breaker.

[0003] Application No. 200420081592.6 discloses a secondary protection shielding device for an outdoor high-voltage vacuum circuit breaker, which is arranged on one side of the operating mechanism box body of the vacuum circuit breaker body. It has the characteristics of not requiring power outage, not requiring opening the cover and sealing plate of the operating mechanism box body, being simple to operate and intuitive. By operating the operating pull ring, the opening and closing of the secondary protection shielding device can be driven. However, during the opening and closing process of the secondary protection shielding device, the operating pull ring generally has a certain resistance, and if the vacuum circuit breaker is located at a high place, an auxiliary structure is needed to push the operating pull ring. This may cause pauses during the pushing process, unable to meet the requirement of quick opening and closing, which may lead to untimely switching and even short-circuit situations. Summary of the Invention

[0004] The present invention discloses a secondary protection shielding device for a vacuum circuit breaker, aiming to solve the technical problems that pauses may occur during the pushing process, unable to meet the requirement of quick opening and closing, which may lead to untimely switching and even short-circuit situations.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A secondary protection shielding device for a vacuum circuit breaker includes a vacuum circuit breaker body. The vacuum circuit breaker body includes a secondary protection shielding instrument, and an opening and closing handle is arranged on one side of the secondary protection shielding instrument. One side of the vacuum circuit breaker body is bolted with a driving mechanism, and the driving mechanism is used to drive the opening and closing of the opening and closing handle. A connecting mechanism is arranged on the driving mechanism, and the connecting mechanism is used to connect with the opening and closing handle;

[0007] The driving mechanism includes an arc-shaped limiting guide rail, and a T-shaped fixing frame is fixedly connected to one side of the arc-shaped limiting guide rail. The T-shaped fixing frame is bolted to one side of the secondary protection shielding instrument. The connecting mechanism is movably connected in the arc-shaped limiting guide rail. Buffer mechanisms are respectively connected to both ends of the arc-shaped limiting guide rail. A bearing is circumferentially connected to the outer periphery of the connecting mechanism, and the bearing is connected to a connecting seat. One side outer wall of the connecting seat is fixedly connected with a hydraulic rod, and the hydraulic rod is hinged to one side outer wall of the vacuum circuit breaker body.

[0008] By providing a driving mechanism, in the driving mechanism, it is connected to the opening and closing handle on the secondary protection shielding instrument through a connecting mechanism, and moves on the arc-shaped limiting guide rail through the connecting mechanism, driving the opening and closing handle to open and close automatically. Based on the rapid contraction of the hydraulic rod, the opening and closing handle can be quickly and decisively pulled to the end, thereby meeting the opening and closing requirements of the secondary protection shielding instrument, completing the rapid switching of the secondary protection shielding mode, and adapting to the automatic switching of the secondary protection shielding mode when using a vacuum circuit breaker at a higher position.

[0009] In a preferred solution, a hinge seat is fixedly connected to the outer wall of the bottom end of the hydraulic rod, and a vertical rod is hinged to one end of the hinge seat. A first fixing frame is fixedly connected to the outer wall of one side of the vacuum circuit breaker body, and the first fixing frame is connected to the vertical rod through bolts. The buffer mechanism includes two abutting plates, and the two abutting plates are respectively arranged at both ends of the arc-shaped limiting guide rail. The opposite outer walls of the two abutting plates can be attached to the outer wall of the connecting mechanism. A second groove is arranged on the inner wall of one side of the abutting plate, and a plurality of springs are equidistantly and fixedly connected to the inner wall of one side of the second groove. One ends of the plurality of springs are simultaneously connected to the outer walls of both ends of the arc-shaped limiting guide rail. Two inner pressing blocks are symmetrically and fixedly connected in the second groove, and the outer wall of one side of the inner pressing block can be attached to the outer walls of both ends of the arc-shaped limiting guide rail.

[0010] By providing a buffer mechanism, under the action of the spring in the buffer mechanism, it can play a certain buffering role, reducing the driving force of the opening and closing handle, thereby playing a role in protecting the service life of the opening and closing handle. At the same time, during the opening and closing process of the opening and closing handle next time, based on the setting of the spring, it can give a certain potential energy assistance in a certain direction, thereby ensuring that the hydraulic rod can smoothly drive the connecting mechanism to move along the arc-shaped limiting guide rail.

[0011] In a preferred solution, the connecting mechanism includes a sleeve, and two first limiting plates are fixedly connected to the outer wall of the sleeve. The two first limiting plates just fit on both sides of the arc-shaped limiting guide rail. An internally threaded tube is movably connected in the sleeve. A screw is engaged in the internally threaded tube, and a tapered head is arranged at one end of the screw. A support tube is fixedly connected to one end of the internally threaded tube. A plurality of through holes are equidistantly arranged through the support tube. A second limiting plate is fixedly connected to the other end of the support tube. Limiting abutting rods are respectively inserted into the plurality of through holes, and inner support blocks are respectively connected to the opposite ends of each limiting abutting rod. A first groove and a rubber pad are simultaneously arranged on the outer side of the inner support block, and elastic rings are simultaneously connected in the plurality of first grooves.

[0012] By providing a connection mechanism for establishing a connection with the opening and closing handle, when multiple inner support blocks move outward synchronously, multiple rubber pads can just fit against the inner wall of the opening and closing handle, clamping and connecting the inner wall of the opening and closing handle in an inner support manner, thereby realizing the connection with the opening and closing handle. In this structure, the operation is simple, and with the movement of the inner threaded tube, it is also more convenient for the overall disassembly of the driving mechanism.

[0013] In a preferred embodiment, the connection seat includes a connection block connected to the output end of the hydraulic rod. One side of the connection block is fixedly connected with a slider, and one side of the connection block is provided with a side support plate in a fitting manner. A chute is provided on the inner wall of one side of the side support plate, and the slider is movably clamped in the chute. One side of the side support plate is fixedly connected with a support plate, and a break is provided at the connection between the support plate and the side support plate. One end of the connection block is fixedly connected with a C-shaped limiting frame, and the inner wall of the bottom end of the C-shaped limiting frame fits against the bottom end of the support plate.

[0014] By providing a connection seat, if the opening and closing handle of the vacuum circuit breaker jams, causing the hydraulic rod to be unable to smoothly push the opening and closing handle, and the driving force of the hydraulic rod continuously acts on the support plate, a fracture will occur at the break, thereby disconnecting the hydraulic rod from the connection mechanism, and at the same time providing protection for the hydraulic rod and the opening and closing handle, effectively avoiding damage to the vacuum circuit breaker and the hydraulic rod.

[0015] As can be seen from the above, a secondary protection shielding device for a vacuum circuit breaker includes a vacuum circuit breaker body. The vacuum circuit breaker body includes a secondary protection shielding instrument, and an opening and closing handle is provided on one side of the secondary protection shielding instrument. One side of the vacuum circuit breaker body is bolted with a driving mechanism for driving the opening and closing handle to open and close. A connection mechanism is provided on the driving mechanism for connecting with the opening and closing handle; the driving mechanism includes an arc-shaped limiting guide rail, and a T-shaped fixing frame is fixedly connected to one side of the arc-shaped limiting guide rail. The T-shaped fixing frame is bolted to one side of the secondary protection shielding instrument. The connection mechanism is movably connected in the arc-shaped limiting guide rail. Buffer mechanisms are respectively connected to both ends of the arc-shaped limiting guide rail. A bearing is circumferentially connected to the outer periphery of the connection mechanism and is connected to the connection seat. A hydraulic rod is fixedly connected to the outer wall of one side of the connection seat, and the hydraulic rod is hinged to the outer wall of one side of the vacuum circuit breaker body. The secondary protection shielding device for a vacuum circuit breaker provided by the present invention has the technical effect of being able to automatically open and close the device according to the opening and closing requirements of the secondary protection shielding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a secondary protection shielding device for a vacuum circuit breaker proposed by the present invention.

[0017] Figure 2Schematic diagram of the overall structure of the driving mechanism of a secondary protection shielding device for a vacuum circuit breaker proposed by the present invention.

[0018] Figure 3 Enlarged view of the driving mechanism of a secondary protection shielding device for a vacuum circuit breaker proposed by the present invention.

[0019] Figure 4 Schematic diagram of the split structure of the buffer mechanism of a secondary protection shielding device for a vacuum circuit breaker proposed by the present invention.

[0020] Figure 5 Schematic diagram of the split structure of the connection mechanism of a secondary protection shielding device for a vacuum circuit breaker proposed by the present invention.

[0021] Figure 6 Schematic diagram of the split structure of the inner support structure in the linkage mechanism of a secondary protection shielding device for a vacuum circuit breaker proposed by the present invention.

[0022] Figure 7 Schematic diagram of the split connection seat of a secondary protection shielding device for a vacuum circuit breaker proposed by the present invention.

[0023] In the figure: 1, vacuum circuit breaker body; 2, driving mechanism; 3, opening and closing handle; 4, connection mechanism; 5, secondary protection shielding instrument; 6, buffer mechanism; 201, hydraulic rod; 202, hinge seat; 203, vertical rod; 204, first fixing frame; 205, connection seat; 206, arc-shaped limiting guide rail; 207, T-shaped fixing frame; 208, bearing; 401, sleeve; 402, first limiting plate; 403, support pipe; 404, perforation; 405, rubber pad; 406, elastic ring; 407, conical head; 408, screw; 409, internally threaded pipe; 410, second limiting plate; 411, first groove; 412, inner support block; 413, limiting abutting rod; 601, abutting plate; 602, second groove; 603, inner pressing block; 604, spring; 2051, connection block; 2052, C-shaped limiting frame; 2053, support plate; 2054, fracture; 2055, sliding groove; 2056, side support plate; 2057, slider. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0025] A secondary protection shielding device for a vacuum circuit breaker disclosed by the present invention is mainly applied to the scenario where a vacuum circuit breaker is used.

[0026] Refer to Figures 1 - 3, A secondary protection shielding device for a vacuum circuit breaker, including a vacuum circuit breaker body 1. The vacuum circuit breaker body 1 includes a secondary protection shielding instrument 5, and an opening and closing handle 3 is provided on one side of the secondary protection shielding instrument 5. One side of the vacuum circuit breaker body 1 is bolted with a driving mechanism 2, and the driving mechanism 2 is used to drive the opening and closing of the opening and closing handle 3. A connecting mechanism 4 is provided on the driving mechanism 2, and the connecting mechanism 4 is used to connect with the opening and closing handle 3; The driving mechanism 2 includes an arc-shaped limiting guide rail 206, and a T-shaped fixing bracket 207 is fixedly connected to one side of the arc-shaped limiting guide rail 206. The T-shaped fixing bracket 207 is bolted to one side of the secondary protection shielding instrument 5. The connecting mechanism 4 is movably connected within the arc-shaped limiting guide rail 206. Buffer mechanisms 6 are respectively connected to both ends of the arc-shaped limiting guide rail 206. A bearing 208 is circumferentially connected to the outer periphery of the connecting mechanism 4, and the bearing 208 is connected to a connecting seat 205. One side outer wall of the connecting seat 205 is fixedly connected with a hydraulic rod 201, and the hydraulic rod 201 is hinged to one side outer wall of the vacuum circuit breaker body 1.

[0027] In the driving mechanism 2, it is connected to the opening and closing handle 3 for controlling the secondary protection shielding instrument 5 through the connecting mechanism 4. After the connecting mechanism 4 is installed, it moves on the arc-shaped limiting guide rail 206 through the connecting mechanism 4, and drives the connecting mechanism 4 to move through the expansion and contraction of the hydraulic rod 201, thereby driving the opening and closing handle 3 to automatically open and close. Based on the rapid contraction of the hydraulic rod 201, the opening and closing handle 3 can be quickly and decisively pulled to the end. Thus, it can follow the opening and closing requirements of the secondary protection shielding instrument 5 to complete the rapid switching of the secondary protection shielding mode, adapting to the self-switching of the secondary protection shielding mode when using the vacuum circuit breaker at a higher position. At the same time, since the driving mechanism 2 is fixed to the vacuum circuit breaker body 1 based on bolts, the driving mechanism 2 can be disassembled at will, so that manual or automatic opening and closing operations can be selected according to the use environment.

[0028] Refer to Figure 3 , In a preferred embodiment, a hinge seat 202 is fixedly connected to the bottom outer wall of the hydraulic rod 201, and one end of the hinge seat 202 is hinged to a vertical rod 203. A first fixing bracket 204 is fixedly connected to one side outer wall of the vacuum circuit breaker body 1, and the first fixing bracket 204 is connected to the vertical rod 203 through bolts.

[0029] Refer to Figure 4 , In a preferred embodiment, the buffer mechanism 6 includes two abutting plates 601, and the two abutting plates 601 are respectively arranged at both ends of the arc-shaped limiting guide rail 206. The opposite side outer walls of the two abutting plates 601 can be attached to the outer wall of the connecting mechanism 4.

[0030] Refer to Figure 4, in a preferred embodiment, a second groove 602 is provided on one inner wall of the bottom plate 601, and a plurality of springs 604 are fixedly connected at equal intervals on one inner wall of the second groove 602. One ends of the plurality of springs 604 are simultaneously connected to the outer walls of both ends of the arc-shaped limiting guide rail 206.

[0031] Refer to Figure 4 , in a preferred embodiment, two inner pressing blocks 603 are symmetrically and fixedly connected in the second groove 602, and the outer wall of one side of the inner pressing block 603 can be attached to the outer walls of both ends of the arc-shaped limiting guide rail 206. In the buffer mechanism 6, through the elastic force of the spring 604, the bottom plate 601 can be pulled closer to the arc-shaped limiting guide rail 206. Among them, through the setting of the inner pressing block 603, the extrusion range of the bottom plate 601 can be limited. When the connecting mechanism 4 moves along with the arc-shaped limiting guide rail 206 and contacts the bottom plate 601, the opening and closing handle 3 is already close to its opening and closing end. By contacting the bottom plate 601, under the action of the spring 604, a certain buffering effect can be achieved, reducing the pulling force of the opening and closing handle 3, thereby playing a role in protecting the service life of the opening and closing handle 3. At the same time, during the next opening and closing process of the opening and closing handle 3, based on the setting of the spring 604, a certain-direction potential energy assistance can be given to it, so as to ensure that the hydraulic rod 201 can smoothly drive the connecting mechanism 4 to move along the arc-shaped limiting guide rail 206.

[0032] Refer to Figure 5 and Figure 6 , in a preferred embodiment, the connecting mechanism 4 includes a sleeve 401, and two first limiting plates 402 are fixedly connected to the outer wall of the sleeve 401. The two first limiting plates 402 just fit on both sides of the arc-shaped limiting guide rail 206. An internally threaded pipe 409 is movably connected inside the sleeve 401.

[0033] Refer to Figure 5 and Figure 6 , in a preferred embodiment, a screw 408 is meshed inside the internally threaded pipe 409, and a conical head 407 is provided at one end of the screw 408. A support pipe 403 is fixedly connected to one end of the internally threaded pipe 409. A plurality of through holes 404 are equidistantly penetrated through the support pipe 403. A second limiting plate 410 is fixedly connected to the other end of the support pipe 403.

[0034] Refer to Figure 5 and Figure 6, in a preferred embodiment, limiting abutting rods 413 are respectively inserted into a plurality of perforations 404, and inner support blocks 412 are respectively connected to opposite ends of each limiting abutting rod 413. A first groove 411 and a rubber pad 405 are simultaneously arranged on the outer side of the inner support block 412. Elastic rings 406 are simultaneously connected in a plurality of first grooves 411. The connecting mechanism 4 is used to establish a connection with the opening and closing handle 3. By translating the internally threaded pipe 409 in the sleeve 401, the positions of a plurality of rubber pads 405 are just located between the opening and closing handles 3. Then, the screw rod 408 is twisted to make the conical head 407 extend in. As the contact position between the conical head 407 and the limiting abutting rod 413 changes, a plurality of inner support blocks 412 can be driven to move outward synchronously. Then, based on the limiting effect of the elastic rings 406, a plurality of rubber pads 405 can just fit against the inner wall of the opening and closing handle 3, and the inner wall of the opening and closing handle 3 is clamped and connected in an inner support manner, thereby realizing the connection with the opening and closing handle 3. In this structure, the operation is simple, and with the movement of the internally threaded pipe 409, it is also more convenient for the overall disassembly of the driving mechanism 2.

[0035] Refer to Figure 7 , in a preferred embodiment, the connecting seat 205 includes a connecting block 2051, and the connecting block 2051 is connected to the output end of the hydraulic rod 201. A slider 2057 is fixedly connected to one side of the connecting block 2051, and a side support plate 2056 is arranged in a fitting manner on one side of the connecting block 2051. A sliding groove 2055 is arranged on the inner wall of one side of the side support plate 2056, and the slider 2057 is movably clamped in the sliding groove 2055.

[0036] Refer to Figure 7, in a preferred embodiment, one side of the side support plate 2056 is fixedly connected to a support plate 2053, and a break 2054 is provided at the connection between the support plate 2053 and the side support plate 2056. One end of the connection block 2051 is fixedly connected to a C-shaped limit frame 2052, and the inner wall of the bottom end of the C-shaped limit frame 2052 is attached to the bottom end of the support plate 2053. During the opening and closing process of the hydraulic rod 201, the support plate 2053 is squeezed by the connection block 2051 to assist the pushing of the hydraulic rod 201, and the hydraulic rod 201 drives the connection mechanism 4 to retract by means of the end of the slider 2057 against one end in the chute 2055 and the C-shaped limit frame 2052 attached to the bottom end of the support plate 2053. If the opening and closing handle 3 of the vacuum circuit breaker jams, causing the hydraulic rod 201 to be unable to smoothly push the opening and closing handle 3, and the driving force of the hydraulic rod 201 continuously acts on the support plate 2053, a fracture will occur at the break 2054, thereby separating the hydraulic rod 201 from the connection mechanism 4, while protecting the hydraulic rod 201 and the opening and closing handle 3, effectively avoiding damage to the vacuum circuit breaker and the hydraulic rod 201. Under the action of the C-shaped limit frame 2052, the break 2054 of the support plate 2053 can be restricted to be in a merged state under normal pushing, thereby reducing the shear force at the break 2054 during long-term use and ensuring the service life of the entire connection seat 205.

[0037] Working principle: In the driving mechanism 2, it is connected to the opening and closing handle 3 for controlling the secondary protection shielding instrument 5 through the connection mechanism 4. After the connection mechanism 4 is installed, it moves on the arc-shaped limit guide rail 206 through the connection mechanism 4, and the connection mechanism 4 is driven to move by the telescopic movement of the hydraulic rod 201, thereby driving the opening and closing handle 3 to open and close automatically. Based on the rapid contraction of the hydraulic rod 201, the opening and closing handle 3 can be quickly and decisively pulled to the end, thereby following the opening and closing requirements of the secondary protection shielding instrument 5 to complete the rapid switching of the secondary protection shielding mode, adapting to the self-switching of the secondary protection shielding mode when using the vacuum circuit breaker at a higher position. At the same time, since the driving mechanism 2 is fixed to the vacuum circuit breaker body 1 by bolts, the driving mechanism 2 can be disassembled at will, so that manual or automatic opening and closing operations can be selected according to the use environment.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A secondary protection shielding device for a vacuum circuit breaker, comprising a vacuum circuit breaker body (1), characterized in that, The vacuum circuit breaker body (1) includes a secondary protection shielding instrument (5), and an opening and closing handle (3) is arranged on one side of the secondary protection shielding instrument (5). One side of the vacuum circuit breaker body (1) is bolted with a driving mechanism (2), and the driving mechanism (2) is used to drive the opening and closing of the opening and closing handle (3). A coupling mechanism (4) is arranged on the driving mechanism (2), and the coupling mechanism (4) is used to connect with the opening and closing handle (3); The driving mechanism (2) includes an arc-shaped limiting guide rail (206), and a T-shaped fixing frame (207) is fixedly connected to one side of the arc-shaped limiting guide rail (206). The T-shaped fixing frame (207) is bolted to one side of the secondary protection shielding instrument (5). The coupling mechanism (4) is movably connected in the arc-shaped limiting guide rail (206). Buffer mechanisms (6) are respectively connected to both ends of the arc-shaped limiting guide rail (206). A bearing (208) is circumferentially connected to the outer periphery of the coupling mechanism (4), and the bearing (208) is connected to a connecting seat (205). A hydraulic rod (201) is fixedly connected to the outer wall of one side of the connecting seat (205), and the hydraulic rod (201) is hinged to the outer wall of one side of the vacuum circuit breaker body (1); The buffer mechanism (6) includes two abutting plates (601), and the two abutting plates (601) are respectively arranged at both ends of the arc-shaped limiting guide rail (206). The opposite outer walls of the two abutting plates (601) can be attached to the outer wall of the coupling mechanism (4); A second groove (602) is arranged on the inner wall of one side of the abutting plate (601), and a plurality of springs (604) are equidistantly and fixedly connected to the inner wall of one side of the second groove (602). One ends of the plurality of springs (604) are simultaneously connected to the outer walls of both ends of the arc-shaped limiting guide rail (206); Two inner pressing blocks (603) are symmetrically and fixedly connected in the second groove (602), and the outer wall of one side of the inner pressing blocks (603) can be attached to the outer walls of both ends of the arc-shaped limiting guide rail (206); The coupling mechanism (4) includes a sleeve (401), and two first limiting plates (402) are fixedly connected to the outer wall of the sleeve (401). The two first limiting plates (402) just fit on both sides of the arc-shaped limiting guide rail (206). An internally threaded pipe (409) is movably connected in the sleeve (401); A screw (408) is meshed in the internally threaded pipe (409), and a conical head (407) is arranged at one end of the screw (408). A support pipe (403) is fixedly connected to one end of the internally threaded pipe (409). A plurality of through holes (404) are equidistantly arranged through the support pipe (403). A second limiting plate (410) is fixedly connected to the other end of the support pipe (403); A plurality of limiting abutting rods (413) are respectively inserted into the plurality of through holes (404), and inner supporting blocks (412) are respectively connected to the opposite ends of each limiting abutting rod (413). A first groove (411) and a rubber pad (405) are simultaneously arranged on the outer side of the inner supporting blocks (412). Elastic rings (406) are simultaneously connected in the plurality of first grooves (411).

2. The secondary protection shielding device of a vacuum circuit breaker according to claim 1, characterized in that, The outer wall of the bottom end of the hydraulic rod (201) is fixedly connected with a hinge seat (202), and one end of the hinge seat (202) is hinged with a vertical rod (203). One side outer wall of the vacuum circuit breaker body (1) is fixedly connected with a first fixing frame (204), and the first fixing frame (204) is connected to the vertical rod (203) through bolts.

3. The secondary protection shielding device for a vacuum circuit breaker according to claim 1, characterized in that, The connecting seat (205) includes a connecting block (2051), and the connecting block (2051) is connected to the output end of the hydraulic rod (201). One side of the connecting block (2051) is fixedly connected with a sliding block (2057), and a side support plate (2056) is arranged in a fitting manner on one side of the connecting block (2051). A chute (2055) is arranged on the inner wall of one side of the side support plate (2056), and the sliding block (2057) is movably clamped in the chute (2055).

4. The secondary protection shielding device of a vacuum circuit breaker according to claim 3, characterized in that, One side of the side support plate (2056) is fixedly connected with a support plate (2053), and a fracture (2054) is arranged at the connection between the support plate (2053) and the side support plate (2056). One end of the connecting block (2051) is fixedly connected with a C-shaped limiting frame (2052), and the inner wall of the bottom end of the C-shaped limiting frame (2052) is attached to the bottom end of the support plate (2053).

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