Handcart device of circuit breaker

Abstract

The present invention relates to a handcart device for a circuit breaker, and more particularly, to a handcart device for a circuit breaker, which improves operation consistency by reducing product processing errors. According to the handcart device of the circuit breaker in one embodiment of the invention, the shell is made of the metal plate, so that the processing error is reduced, and the reliability and the consistency of operation are improved.

Description

Technical Field

[0001] The invention relates to a trolley device for a circuit breaker, and in particular to a trolley device for a circuit breaker capable of reducing product processing errors and improving operation consistency. Background Art

[0002] Generally, a circuit breaker is an electrical device installed in a transmission or substation line or a part of an electrical circuit, which protects electrical facilities and loads by cutting off the circuit if a fault such as a switching load or a short circuit occurs.

[0003] The circuit breaker includes a switching mechanism for opening and closing the circuit, a detection mechanism for detecting abnormal current, a tripping mechanism for protecting the line or load by separating the switching mechanism when abnormal current such as overcurrent or short-circuit current occurs, and an arc extinguishing unit that has the function of extinguishing and cooling the arc (Arc) generated when the circuit is cut off.

[0004] Among circuit breakers, vacuum circuit breaker is a circuit breaker installed in high-voltage power system. It is used to cut off the circuit to protect the power system in dangerous situations such as short circuit or overcurrent. Its design utilizes the excellent insulation performance and arc extinguishing ability under vacuum state.

[0005] The vacuum circuit breaker is installed in a switchboard together with various other electrical devices and is usually housed in a fixed bracket fixed to the switchboard for use. The switchboard is used to operate or control a power station or a substation, the operation of a motor, and the like.

[0006] Inside the switchboard, there are: a service position, where the busbar and load terminals of the vacuum circuit breaker are connected to the busbar and load terminals of the fixed bracket and supply voltage and current; and a test position, which is separated from the terminals of the fixed bracket and can only test the operation of the circuit breaker.

[0007] The action of pushing the vacuum circuit breaker in to connect with the busbar portion of the fixing bracket is called draw in, and the action of pulling it out is called draw out.

[0008] Figure 1 The perspective view shows a state where a circuit breaker 60 and a transfer device 20 according to the prior art are installed in a distribution box 50. The circuit breaker 60 is shown by an imaginary line.

[0009] Figure 2 The figure shows a perspective view of the transfer device 20. The figure shows a state where the upper plate is removed from the frame portion 20.

[0010] Figure 3 A top view of the transfer mechanism is shown.

[0011] The circuit breaker 60 is loaded on the transfer device 20 (handcart) and moved. The handle (not shown) is inserted into the handle slot 12 of the beam (Girder) assembly 10 provided on the front of the transfer device 20, and the lead screw 30 is rotated, so that the transfer device 20 can be moved and the circuit breaker 60 can be moved in and out. The wheels 29 of the transfer device 20 move along the track 52 of the distribution box 50. At this time, the beam assembly 10 is inserted into the fixing hole 53 of the fixing bracket 51 of the distribution box 50 through the protrusion 11 to be fixed.

[0012] When the transfer device 20 is moved into the distribution box 50, it moves back and forth, thereby traveling back and forth between the test position and the service position of the circuit.

[0013] like Figure 3 As shown, the conventional transfer mechanism is composed of a housing 21, idling bars 24, 27, a bearing 23, an idling nut 22, a spring 26 and a pin bolt 25.

[0014] The idler levers 24 and 27 are connected to the housing 21 so as to be linearly movable by assembling the pin bolt 25 and the spring 10 .

[0015] When the idler rods 24 and 27 overcome the force of the spring 10 and move, the pin bolt 25 also moves with the idler rods 24 and 27. When the idler rods 24 and 27 do not move, the pin bolt 25 restricts the idle rotation of the idler nut 22, resulting in relative movement with the lead screw 30. If the idler rods 24 and 27 move, the pin bolt 25 releases the restriction on the idler nut 22, causing the idler nut 22 to idle with the rotation of the lead screw 30.

[0016] The idle levers 24 and 27 move in the test position or the service position of the main circuit, so the idle nut 22 idles in the test position or the service position of the main circuit, thereby preventing excessive movement of the transfer device 20. That is, when the handle is rotated in the moved-in state of the main circuit, the transfer device 20 moves only between the test position and the service position.

[0017] Furthermore, a bearing 23 is interposed between the idle nut 22 and the housing 21 .

[0018] Furthermore, the housing 21 is composed of three plates. The font is welded.

[0019] However, the shell welded in this way may have errors such as processing tolerances or cumulative tolerances when the parts are manufactured, which may cause accuracy or direction errors when running in the mechanism.

[0020] Furthermore, the bearing 23 is a relatively expensive component, thereby unnecessarily increasing the cost of the mechanism.

[0021] For these reasons, the transfer mechanism according to the prior art has problems such as difficulty in manufacturing and increased manufacturing costs.

[0022] As prior art, reference may be made to Korean Utility Model No. 20-0462421 “Beam and trolley assembly of vacuum circuit breaker” and Authorized Invention No. 10-1117975 “Main circuit transfer device of vacuum circuit breaker” applied for and authorized by the present applicant. Summary of the invention

[0023] Problem that the invention aims to solve

[0024] The present invention is proposed to solve the above-mentioned problem, and its purpose is to provide a trolley device for a circuit breaker, which is used to reduce product processing errors and improve operation reliability.

[0025] Means used to solve problems

[0026] According to an embodiment of the present invention, a trolley device for a circuit breaker includes: a beam assembly; a frame assembly connected to and moving with the beam assembly; a lead screw configured to be connected to the beam assembly and the frame assembly; a housing fixed to the frame assembly, the lead screw passing through the housing; and a power transmission member accommodated in the housing and sleeved on the lead screw, rotating together with the lead screw or moving along the axial direction of the lead screw; the housing includes: a main body covering and protecting the power transmission member; and a coupling portion disposed at both ends of the main body and coupled to the frame assembly.

[0027] Wherein, the main body includes a front portion, a top portion and a back portion.

[0028] Furthermore, the main body has a front joint surface and a rear joint surface at a lower end portion thereof, which are joined to the bottom surface of the frame assembly.

[0029] In addition, a first curved portion is formed between the front portion joint surface and the front portion; a second curved portion is formed between the front portion and the top portion; a third curved portion is formed between the top portion and the back portion; and a fourth curved portion is formed between the back portion and the back portion joint surface.

[0030] Furthermore, the housing includes a lost motion operating lever for restricting or releasing the restriction of the power transmission member.

[0031] Furthermore, the idle operation lever is inserted into a front lever hole formed in the front portion and a rear lever hole formed in the rear portion.

[0032] Furthermore, the front rod hole and the rear rod hole are formed to have sizes different from each other.

[0033] Furthermore, the idle operation lever is formed with an insertion portion to be inserted into the rear lever hole.

[0034] Furthermore, bushings are provided between the power transmission member and the front surface of the housing or between the power transmission member and the back surface of the housing.

[0035] Furthermore, the idle operation lever is coupled to a pin bolt inserted into a fixing groove of the power transmission member.

[0036] Effects of the Invention

[0037] According to the trolley device of the circuit breaker in one embodiment of the present invention, the housing is made of sheet metal, which reduces the processing error and thus improves the reliability and consistency of operation.

[0038] Furthermore, the shell is divided into a bent portion and a cut portion, which improves manufacturability and maintains strength.

[0039] In addition, the housing is provided with a top surface portion to protect the components of the transfer mechanism portion.

[0040] In addition, a bushing is provided between the housing and the power transmission member, which reduces the manufacturing cost and has excellent use efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A perspective view of a vacuum circuit breaker according to the prior art.

[0042] Figure 2 yes Figure 1 Rear view of the mid-hand car device.

[0043] Figure 3 It is a top view of the transfer device portion of the trolley device.

[0044] Figure 4 and Figure 5 is a three-dimensional diagram of a trolley device for a circuit breaker according to an embodiment of the present invention. Figure 4 It is the test position of the main circuit. Figure 5 It is the service location.

[0045] Figure 6 It is a perspective view of a transfer mechanism used in a trolley device of a circuit breaker according to an embodiment of the present invention.

[0046] Figure 7 yes Figure 6 Exploded perspective view of the transfer mechanism. The lead screw is not included.

[0047] Figures 8 to 10 1 is a functional diagram of a trolley device for a circuit breaker according to an embodiment of the present invention. Figure 8Shows the state of being stationary in the test position, Fig. 9 Shows the status of moving from the test position to the service position, Fig.10 Shown in the stationary state in the service position.

[0048] Figures 11 to 13 are respectively Figures 8 to 10 Detailed view of the corresponding transfer device section. DETAILED DESCRIPTION

[0049] Hereinafter, the preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the detailed description of the present invention is only for the convenience of those skilled in the art to easily implement the present invention, and does not mean that the technical concept and scope of the present invention are limited to these drawings.

[0050] In the present invention, the terms “member” or “portion” used to designate constituent elements are not used for a limiting purpose and do not matter even if they are omitted.

[0051] Figure 4 and Figure 5 is a three-dimensional diagram of a trolley device for a circuit breaker according to an embodiment of the present invention. Figure 4 It is the test position of the main circuit. Figure 5 It is the service location. Figure 6 It is a perspective view of a transfer mechanism used in a trolley device of a circuit breaker according to an embodiment of the present invention. Figure 7 yes Figure 6 The following will describe in detail the trolley device of the circuit breaker according to each embodiment of the present invention with reference to the accompanying drawings.

[0052] According to an embodiment of the present invention, a trolley device 100 for a circuit breaker includes: a beam assembly 200; a frame assembly 110 connected to and moving with the beam assembly 200; a lead screw 230 connecting the beam assembly 200 and the frame assembly 110; a shell 310 fixed to the frame assembly 110, through which the lead screw 230 passes; and a power transmission member 340, which is accommodated in the shell 310 and sleeved on the lead screw 230, and rotates with the lead screw 230 or moves along the axial direction of the lead screw 230; the shell 310 includes: a main body 311, 312, 313 covering and protecting the power transmission member 340; and coupling parts 314, 315 arranged at both ends of the main body 311, 312, 313 and coupled to the frame assembly 110.

[0053] Figure 4 and Figure 5 FIG. 2 shows a trolley device 100 according to an embodiment of the present invention. Figure 4The frame assembly moves forward to put the main circuit in the test position. Figure 5 The frame assembly is shown in the state where the main circuit is in the service position after being moved backward.

[0054] The trolley device 100 is provided so as to be able to carry and move a main circuit (not shown) of a circuit breaker.

[0055] The cart device 100 includes a frame assembly 110 , a beam assembly 200 , and a transfer mechanism 300 .

[0056] The frame assembly 110 is formed in a box shape. In the drawings, in order to show the internal structure of the frame assembly 110, the top plate is removed.

[0057] Transfer wheels 115 are provided on both side surfaces of the frame assembly 110. Two transfer wheels 115 may be provided on each side.

[0058] A lead screw 230 is provided. The lead screw 230 provides a rotational force for moving the frame assembly 110 through a user's operation.

[0059] The lead screw 230 is disposed through the transfer mechanism 300 .

[0060] The front end portion of the lead screw 230 is disposed in the screw handle insertion port 214 of the beam assembly 200 , and the rear end portion of the lead screw 230 is disposed inside the frame assembly 110 .

[0061] The rear end of the lead screw 230 is provided with a rear bracket 120. The rear bracket 120 may be formed as Font.

[0062] A lead screw insertion portion 122 is formed protrudingly at the rear end bracket 120. The lead screw insertion portion 122 is coupled and fixed to the rear end portion of the lead screw 230.

[0063] A second idle operation lever stopper 124 is formed protruding from the rear end bracket 120. The second idle operation lever stopper 124 stops the movement of the frame assembly 110 by pressing the second idle operation lever 360 when the frame assembly 110 moves backward (wherein, the backward movement of the frame assembly refers to the direction away from the beam assembly. Same below) and moves to the service position of the main circuit.

[0064] In addition, the frame assembly 110 is also provided with various devices such as an interlocking device and a main circuit position indicating device.

[0065] The frame assembly 110 moves forward or backward by the relative movement between the lead screw 230 and the transfer mechanism 300. Since the transfer mechanism 300 is fixed to the bottom surface 114 of the frame assembly 110, when the transfer mechanism 300 moves with the rotation of the lead screw 230, the frame assembly 110 moves forward or backward together with the transfer mechanism 300. The transfer mechanism 300 will be described in detail later.

[0066] The crossbeam assembly 200 is disposed in front of the frame assembly 110. When the trolley device 100 is moved into a fixed bracket (not shown), the crossbeam assembly 200 is fixed on the fixed bracket. Therefore, the frame assembly 110 moves relative to the crossbeam assembly 200.

[0067] The beam assembly 200 includes a beam plate 202 and a front panel 210 .

[0068] The beam plate 202 may be formed in a box shape with an open back surface.

[0069] A push-pull handle 205 is provided on the cross beam plate 202. The user can use the push-pull handle 205 to move the trolley device 100 into the switchboard or the fixed bracket, or move it out from the switchboard or the fixed bracket.

[0070] The two sides of the cross beam plate 202 are provided with locking protrusions 207. The locking protrusions 207 act in conjunction with the push-pull handle 205. The locking protrusions 207 fix the cross beam assembly 200 to the fixed bracket and cannot move at will.

[0071] The front panel 210 may be formed as The front panel 210 is fixed to the cross beam plate 202 .

[0072] A main circuit position indicator 212 is provided on the front panel 210 . The main circuit position indicator 212 is a part of the main circuit position indicator 220 .

[0073] A screw handle insertion opening 214 is provided on the front panel 210. The user can insert the screw handle into the handle insertion opening 214 to rotate the lead screw 230.

[0074] The beam assembly 200 is provided with a lead screw 230 , a main circuit position indicator 220 , interlocking devices 240 , 245 , and the like.

[0075] The beam assembly 200 is fixed to a fixed bracket, and the frame assembly 110 moves forward or backward according to the relative movement between the lead screw 230 and the transfer mechanism 300 .

[0076] Figure 6 The transfer mechanism 300 is shown. Figure 7 An exploded perspective view of the transfer mechanism unit 300 is shown. Figure 7 For ease of illustration, the lead screw 230 is not included.

[0077] The transfer mechanism 300 is a mechanism for moving the frame assembly 110 or preventing the frame assembly 110 from moving according to the rotation of the lead screw 230. That is, the transfer mechanism 300 can transmit or not transmit the rotational force of the lead screw 230 to the frame assembly 110 through relative movement with the lead screw 230.

[0078] If the power transmission member 340 of the transfer mechanism 300 is fixed and does not rotate together with the lead screw 230 but moves relatively, the rotational force of the lead screw 230 is transmitted to the frame assembly 110, so that the frame assembly 110 moves.

[0079] If the power transmission member 340 of the transfer mechanism 300 rotates together with the lead screw 230 , the power transmission member 340 will rotate idly, and the rotational force of the lead screw 230 will not be transmitted to the frame assembly 110 , so the frame assembly 110 will not move.

[0080] The transfer mechanism 300 includes a housing 310 fixed to the bottom surface 114 of the frame assembly 110 , a power transmission member 340 provided in the housing 310 , and idle operation levers 350 , 360 .

[0081] The housing 310 accommodates and supports a plurality of elements of the transfer mechanism unit 300 .

[0082] The housing 310 can be manufactured by sheet metal processing, that is, the housing 310 can be manufactured by bending a straight-line plate and then performing a stamping process.

[0083] The housing 310 has The main body parts 311, 312, 313 of the character and the connecting parts 314, 315 unfolded into wing shapes.

[0084] The main body 311, 312, 313 includes a front portion 311, a top portion 312, and a back portion 313. The main body 311, 312, 313 protects various elements of the transfer mechanism 300. In particular, the top portion 312 can be protected from contact with the outside.

[0085] The lower ends of the main bodies 311, 312, 313 are provided with coupling parts 314, 315. The coupling parts 314, 315 are composed of a front coupling surface 314 and a rear coupling surface 315. The coupling parts 314, 315 are coupled to the bottom surface 114 of the frame assembly 110. That is, the transfer mechanism 300 is fixed to the frame assembly 110.

[0086] Bends 316, 317, 318, 319 are formed between the surfaces of the main body parts 311, 312, 313 and between the main body parts 311, 312, 313 and the joint parts 314, 315. That is, a first bend 316 is formed between the front joint surface 314 and the front part 311, a second bend 317 is formed between the front part 311 and the top face part 312, a third bend 318 is formed between the top face part 312 and the back part 313, and a fourth bend 319 is formed between the back part 313 and the back joint surface 315.

[0087] In the middle of each curved portion, a cutout portion 326, 327, 328, 329 is provided. That is, a first cutout portion 326 is formed in the middle of the first curved portion 316, a second cutout portion 327 is formed in the middle of the second curved portion 317, a third cutout portion 328 is formed in the middle of the third curved portion 318, and a fourth cutout portion 329 is formed in the middle of the fourth curved portion 319.

[0088] The cutouts 326, 327, 328, 329 facilitate the bending of the bent portions 316, 317, 318, 319 and improve the planarity of the front portion 311 and the back portion 313. In addition, the area around the screw holes 321, 323 described later is ensured, thereby maintaining the required mechanical strength.

[0089] The housing 310 is formed in one piece by a sheet metal operation, so the processing error is small, which helps to improve the reliability of the product. Compared with the previous method of welding a plurality of plates together to manufacture the housing, the operation is easier and the product reliability is also improved.

[0090] Screw holes 321 and 323 into which the lead screw 230 is inserted are formed in the front portion 311 and the back portion 313 of the housing 310 .

[0091] Rod holes 331 , 332 , 333 , 334 into which the idle motion operating rods 350 , 360 are inserted are formed in the front portion 311 and the back portion 313 of the housing 310 .

[0092] The first rod holes 331 , 332 are formed at one side of the threaded holes 321 , 323 , and the first rod holes 333 , 334 are formed at the other side of the threaded holes 321 , 323 .

[0093] The first front rod hole 331 is formed larger than the first rear rod hole 332, and the second front rod hole 333 is formed smaller than the second rear rod hole 334. Alternatively, the first front rod hole 331 is formed smaller than the first rear rod hole 332, and the second front rod hole 333 is formed larger than the second rear rod hole 334. That is, the front rod hole and the rear rod hole may be formed in different sizes from each other.

[0094] A first idle operation lever 350 is inserted into the first front rod hole 331 and the first rear rod hole 332 , and a second idle operation lever 360 is inserted into the second front rod hole 333 and the second rear rod hole 334 .

[0095] A power transmission member 340 is provided to transmit the rotational force of the lead screw 230. The power transmission member 340 is sleeved on the lead screw 230. If the power transmission member 340 is fixed by an external force and moves relative to the lead screw 230, the rotational force of the lead screw 230 is transmitted to the frame assembly 110. If the power transmission member 340 is not subjected to an external force and rotates together with the lead screw 230, the rotational force of the lead screw 230 is not transmitted to the frame assembly 110.

[0096] The power transmission member 340 is accommodated in the main body parts 311, 312, 313 of the housing 310. The power transmission member 340 is formed in a tubular shape or a nut shape, and has a thread formed on the inner circumferential surface 341. Therefore, the power transmission member 340 can be sleeved on the lead screw 230 and rotate with the lead screw 230.

[0097] If no external force is applied to the power transmission member 340, the power transmission member 340 rotates together with the lead screw 230. If the power transmission member 340 is fixed by the external force and the lead screw 230 rotates, the power transmission member 340 moves relative to the lead screw 230. Therefore, if the power transmission member 340 is fixed, the lead screw 230 moves in the axial direction of the lead screw 230.

[0098] The power transmission member 340 has fixing grooves 342 and 343 at both ends of its outer circumference. The fixing grooves 342 and 343 are composed of a first fixing groove 342 formed at one end and a second fixing groove 343 formed at the other end. A plurality of the first fixing groove 342 and the second fixing groove 343 may be formed along the circumference.

[0099] The first fixing groove 342 fixes or idles the power transmission member 340 at a position other than the test position of the main circuit (the position where the frame assembly 110 contacts the beam assembly 200). A first right-angle groove portion 342a perpendicular to the rotation direction of the power transmission member 340 is formed on one side of the first fixing groove 342, and a first oblique groove portion 342b inclined to the rotation direction of the power transmission member 340 is formed on the other side of the first fixing groove 342.

[0100] When the first pin bolt 370 is inserted into the first fixing groove 342, if the first pin bolt 370 is subjected to force in the direction of abutting against the first right-angle groove portion 342a, the power transmission component 340 is fixed and makes relative movement relative to the lead screw 230. If the first pin bolt 370 is subjected to force in the direction of abutting against the first inclined groove portion 342b, the power transmission component 340 cannot be fixed and rotates idly together with the lead screw 230.

[0101] Regarding the function of the power transmission member 340, please refer to Figures 8 to 13 .

[0102] Fig. 9 , Fig.10 and Fig.12 , Fig.13 In the middle, that is, at a position other than the test position of the main circuit, the first pin bolt 370 is inserted into the first fixing groove 342 , and therefore, the first pin bolt 370 participates in the rotational force transmission of the lead screw 230 .

[0103] If the lead screw 230 moves counterclockwise, the first pin bolt 370 abuts against the first right angle groove portion 342a of the first fixing groove 342 to fix the power transmission member 340. Therefore, the lead screw 230 moves relative to the power transmission member 340, thereby moving in the axial direction of the lead screw 230.

[0104] If the lead screw 230 moves in the clockwise direction, the first pin bolt 370 abuts against the first inclined groove portion 342 b of the first fixing groove 342 and slides, so that the power transmission member 340 rotates idly together with the lead screw 230 .

[0105] exist Figure 8 and Fig.11 In the test position of the main circuit, the first pin bolt 370 is disengaged from the first fixing groove 342, and therefore, the first pin bolt 370 cannot participate in the rotational force transmission of the lead screw 230. That is, in the test position of the main circuit, the first pin bolt 370 is disengaged from the first fixing groove 342, and therefore, the first pin bolt 370 cannot affect the rotation of the power transmission member 340.

[0106] The second fixing groove 343 fixes or idles the power transmission member 340 at a position other than the service position of the main circuit (the position where the frame assembly 110 is farthest from the beam assembly 200). A second right-angle groove portion 343a perpendicular to the rotation direction of the power transmission member 340 is formed on one side of the second fixing groove 343, and a second inclined groove portion 343b inclined to the rotation direction of the power transmission member 340 is formed on the other side of the second fixing groove 343.

[0107] When the second pin bolt 375 is inserted into the second fixing groove 343, if the second pin bolt 375 is subjected to force in the direction of abutting against the second right-angle groove portion 343a, the power transmission component 340 is fixed and makes relative movement relative to the lead screw 230. If the second pin bolt 375 is subjected to force in the direction of abutting against the second inclined groove portion 343b, the power transmission component 340 cannot be fixed and rotates idly together with the lead screw 230.

[0108] Regarding the function of the power transmission member 340, please refer to Figures 8 to 13 .

[0109] Figure 8 , Fig. 9 and Fig.11 , Fig.12 In the middle, that is, at a position other than the service position of the main circuit, the second pin bolt 375 is inserted into the second fixing groove 343 , and therefore, the second pin bolt 375 participates in the rotational force transmission of the lead screw 230 .

[0110] If the lead screw 230 moves in the clockwise direction, the second pin bolt 375 abuts against the second right angle groove portion 343a of the second fixing groove 343 to fix the power transmission member 340. Therefore, the lead screw 230 moves relative to the power transmission member 340, thereby moving in the axial direction of the lead screw 230.

[0111] If the lead screw 230 moves in the counterclockwise direction, the second pin bolt 375 abuts against the second inclined groove portion 343 b of the second fixing groove 343 and slides, so that the power transmission member 340 rotates idly together with the lead screw 230 .

[0112] exist Fig.10 and Fig.13 In the service position of the main circuit, the second pin bolt 375 is disengaged from the second fixing groove 343, so the second pin bolt 375 cannot participate in the rotational force transmission of the lead screw 230. In the service position of the main circuit, the second pin bolt 375 is disengaged from the second fixing groove 343, so the second pin bolt 375 cannot affect the rotation of the power transmission member 340.

[0113] Bushings 348 and 349 are respectively provided on both end surfaces of the power transmission member 340. The first bushing 348 is provided between the power transmission member 340 and the front portion 311 of the housing 310, and the second bushing 349 is provided between the power transmission member 340 and the back portion 313 of the housing 310.

[0114] The bushings 348 , 349 may be formed in a disc shape or a ring shape.

[0115] Bushings 348 and 349 are provided between the power transmission member 340 and the housing 310, so that the power transmission member 340 can rotate smoothly and without friction. Since it does not adopt a costly and complex structure such as a bearing, but is composed of a simple bushing, the product cost is reduced.

[0116] In order to move the pin bolts 370 and 375, the lost motion operating levers 350 and 360 are provided. The pin bolts 370 and 375 are combined with the lost motion operating levers 350 and 360.

[0117] The first lost motion operating lever 350 moves the first pin bolt 370 . The second lost motion operating lever 360 moves the second pin bolt 375 .

[0118] A first insertion portion 352 inserted into the first rear lever hole 332 is formed at the rear end of the first idle operation lever 350. The first insertion portion 352 is formed smaller than the width of the main body of the first idle operation lever 350 by the first step portion 351.

[0119] The first idle operation lever 350 is provided with a first contact portion 354 at the front end thereof. When the first contact portion 354 contacts the beam plate 202, the first idle operation lever 350 is pushed backward. The contact position with the beam plate 202 is clearly formed by the first contact portion 354, thereby having excellent contact force.

[0120] A first return spring 380 is provided at the first insertion portion 352 of the first idle operation lever 350. The rear end of the first return spring 380 contacts the back surface 313 of the housing 310. If the first idle operation lever 350 is separated from the beam plate 202, the first return spring 380 returns to the initial position.

[0121] The first idle motion operating lever 350 includes a first pin coupling hole 355 coupled to the first pin bolt 370 . The first pin bolt 370 is coupled to the first idle motion operating lever 350 and moves together with the first idle motion operating lever 350 .

[0122] When the first idling operating rod 350 is not subjected to external force, the first idling operating rod 350 is in a state of moving forward under the action of the first return spring 380, so that the first pin bolt 370 can be inserted into the first fixing groove 342, thereby fixing the power transmission component 340. When the first idling operating rod 350 is in contact with the crossbeam plate 202 in the test position of the main circuit, the first idling operating rod 350 is in a state of moving backward by overcoming the first return spring 380, so the first pin bolt 370 is disengaged from the first fixing groove 342 and cannot fix the power transmission component 340.

[0123] The first pin bolt 370 is coupled to the first lost motion operating lever 350 .

[0124] The first pin bolt 370 includes a first pin coupling portion 371 inserted into the first pin coupling hole 355 of the first idle operation lever 350 , and a first pin protrusion 372 inserted into the first fixing groove 342 of the power transmission member 340 .

[0125] The second idle operation lever 360 has a second insertion portion 362 formed at the rear end thereof to be inserted into the second rear rod hole 332. The second insertion portion 362 is formed to have a smaller width than the body portion of the second idle operation lever 360 by the second step portion 361.

[0126] The second idle operation lever 360 is provided at a front end with a second contact portion 364. If the second contact portion 364 abuts against the second operation lever stopper 124 of the rear end bracket 120, the second idle operation lever 360 is pushed forward.

[0127] The second insertion portion 362 of the second idle operation lever 360 is provided with a second return spring 380 . A rear end portion of the second return spring 380 is in contact with the front surface portion 311 of the housing 310 .

[0128] The second idle motion operating lever 360 includes a second pin coupling hole 365 coupled to the second pin bolt 375. The second pin bolt 375 is coupled to the second idle motion operating lever 360 and moves together with the second idle motion operating lever 360.

[0129] When the second idling operating lever 360 is not subjected to external force, the second idling operating lever 360 is in a state of moving forward under the action of the second return spring 380, so that the second pin bolt 375 is inserted into the second fixing groove 343, thereby fixing the power transmission component 340. When the second idling operating lever 360 is in a state of contacting with the rear end bracket 120 in the service position of the main circuit, the second idling operating lever 360 is in a state of moving forward by overcoming the second return spring 380, so the second pin bolt 375 is disengaged from the second fixing groove 343 and cannot fix the power transmission component 340.

[0130] The second pin bolt 375 is coupled to the second lost motion operating lever 360 .

[0131] The second pin bolt 375 has a second pin coupling portion 376 inserted into the second pin coupling hole 365 of the second idle operation lever 360 , and a second pin protrusion 377 inserted into the second fixing groove 343 of the power transmission member 340 .

[0132] Now refer to Figures 8 to 13 , to understand the function of the transfer device of the vacuum circuit breaker according to an embodiment of the present invention.

[0133] First, refer to Figure 8 and Fig.11 . The main circuit is in test state.

[0134] The handcart device 100 is in a state where the frame assembly 110 is in contact with the beam assembly 200. The first idle operation lever 350 is pushed by the beam plate 202 and is in a state of being moved backward. Therefore, the first pin bolt 370 is in a state of being disengaged from the first fixing groove 342.

[0135] In this state, even if the user rotates the lead screw 230 counterclockwise using the screw handle (not shown), the first pin bolt 370 is not subjected to force, so the power transmission member 340 idles together with the lead screw 230. Therefore, the frame assembly 110 does not move forward further, but stays in the test state. When the power transmission member 340 idles along with the lead screw 230, the second pin bolt 375 abuts against the second inclined groove portion 343b and slides.

[0136] Next, refer to Fig. 9 and Fig.12 The main circuit is moving from the test state to the service state.

[0137] If the user rotates the lead screw 230 clockwise using the screw handle, the second pin bolt 375 inserted into the second fixing groove 343 causes the power transmission member 340 to be subjected to force, so that the power transmission member 340 is fixed in the rotation direction and moves relative to the lead screw 230. That is, the power transmission member 340 moves backward along the axis of the lead screw 230. Therefore, the frame assembly 110 is separated from the beam assembly 200 and moves backward. The main circuit moves from the test state to the service state.

[0138] Next, refer to Fig.10 and Fig.13 . The main circuit is in service.

[0139] The handcart device 100 is in a state where the frame assembly 110 and the beam assembly 200 are separated to the maximum extent. The second idle operation lever 360 is pushed forward by the second operation lever stopper 124 of the rear bracket 120. Therefore, the second pin bolt 375 is disengaged from the second fixing groove 343.

[0140] In this state, even if the user rotates the lead screw 230 clockwise using the screw handle, the second pin bolt 375 is not subjected to force, so the power transmission member 340 idles together with the lead screw 230. Therefore, the frame assembly 110 does not move further backward but stays in the service state. When the power transmission member 340 idles along with the lead screw 230, the first pin bolt 370 abuts against the first inclined groove portion 342b and slides.

[0141] According to the trolley device of the circuit breaker in one embodiment of the present invention, the housing is made of sheet metal, which reduces processing errors and thus improves operational reliability and consistency.

[0142] Furthermore, the shell is divided into a bent portion and a cut portion, which improves manufacturability and maintains strength.

[0143] In addition, the housing is provided with a top surface portion to protect the components of the transfer mechanism portion.

[0144] In addition, a bushing is provided between the housing and the power transmission member, which reduces the manufacturing cost and has excellent use efficiency.

[0145] The embodiments described above are preferred embodiments for realizing the present invention, and those skilled in the art can make various modifications and deformations within the scope of the essential characteristics of the present invention. Therefore, these embodiments are not used to limit the technical ideas of the present invention, but are only used for illustration. Therefore, it should be understood that these embodiments do not limit the scope of the technical ideas of the present invention. That is, the protection scope of the present invention should be interpreted according to the following claims, and all technical ideas within the equivalent scope should be interpreted as belonging to the scope of rights of the present invention.

[0146] Description of Reference Numerals

[0147] 100: Cart device

[0148] 110: Frame assembly

[0149] 120: Rear bracket

[0150] 122: Lead screw insertion part

[0151] 124: Second operating lever stopper

[0152] 200: Beam assembly

[0153] 202: Beam plate

[0154] 205: Push-pull handle

[0155] 210: Front panel

[0156] 214: Screw handle insertion port

[0157] 230: Lead screw

[0158] 300: Transfer mechanism

[0159] 310: Shell

[0160] 311: Frontal face

[0161] 312: Top face

[0162] 313: Back

[0163] 314: Front joint surface

[0164] 315: Back joint surface

[0165] 316: First bend

[0166] 317: Second bend

[0167] 318: The third bend

[0168] 319: Fourth bend

[0169] 321, 323: threaded holes

[0170] 331: First front rod hole

[0171] 332: First back rod hole

[0172] 333: Second front rod hole

[0173] 334: Second back rod hole

[0174] 340: Power transmission parts

[0175] 342: First fixed slot

[0176] 342a: First right angle groove

[0177] 342b: First chute portion

[0178] 343: Second fixed slot

[0179] 343a: First right angle groove

[0180] 343b: First chute portion

[0181] 350: First idle operating lever

[0182] 360: Second idle lever

[0183] 370: First pin bolt

[0184] 371: First pin joint

[0185] 372: First pin protrusion

[0186] 375: Second pin bolt

[0187] 376: Second pin joint

[0188] 377: Second pin protrusion

Claims

1. A trolley device for a circuit breaker, wherein: include: Beam assembly; A frame assembly connected to and movable with the beam assembly; a lead screw configured to be connected to the beam assembly and the frame assembly; A housing fixed to the frame assembly, wherein the lead screw passes through the housing; as well as A power transmission member, housed in the housing and sleeved on the lead screw, rotating together with the lead screw or moving along the axial direction of the lead screw; The housing comprises: a main body portion, covering and protecting the power transmission member; and a coupling portion, which is arranged at two ends of the main body and coupled to the frame assembly.

2. The circuit breaker trolley device according to claim 1, wherein: The main body includes a front portion, a top portion, and a back portion.

3. The trolley device for circuit breaker according to claim 2, wherein: The coupling portion includes a front coupling surface and a rear coupling surface coupled to the bottom surface of the frame assembly.

4. The trolley device for circuit breaker according to claim 3, wherein: A first curved portion is formed between the front portion joint surface and the front portion; a second curved portion is formed between the front portion and the top portion; a third curved portion is formed between the top portion and the back portion; and a fourth curved portion is formed between the back portion and the back portion joint surface.

5. The trolley device for circuit breaker according to claim 2, wherein: The housing includes an idle operation lever for restricting or releasing the restriction of the power transmission member.

6. The trolley device for circuit breaker according to claim 5, wherein: The idle operation lever is inserted into a front lever hole formed in the front portion and a rear lever hole formed in the rear portion.

7. The trolley device for circuit breaker according to claim 6, wherein: The front rod hole and the rear rod hole are formed to have different sizes from each other.

8. The trolley device for circuit breaker according to claim 6, wherein: The idle operation lever is formed with an insertion portion that is inserted into the rear lever hole.

9. The trolley device for circuit breaker according to claim 6, wherein: The idle operation lever has a protruding contact portion formed at a front end portion.

10. The trolley device for circuit breaker according to claim 2, wherein: Bushings are provided between the power transmission member and the front surface of the housing or between the power transmission member and the back surface of the housing.

11. The trolley device for circuit breaker according to claim 5, wherein: The idle operation lever is coupled to a pin bolt inserted into a fixing groove of the power transmission member.

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