An automatic power-off device for an electric switch machine with a hand crank

Abstract

The present invention discloses an automatic power-off device for an electric switch machine using a hand crank, comprising a switch base and a hand crank; the left end of the switch base has a first cavity that runs longitudinally through it; the first cavity is used to longitudinally insert a crank connector on the hand crank; the right end of the switch base is provided with a second cavity that is distributed transversely; the second cavity and the first cavity are mutually perpendicularly connected; the upper and lower sides of the right end of the switch base are respectively provided with a vertically running long circular groove; the upper and lower sides of the second cavity are respectively connected with the two long circular grooves; a quick-acting switch is respectively provided on the two long circular grooves; the second cavity is provided with a switch shaft; the right end of the switch shaft is provided with a reset spring; the reset spring is sleeved on the left end of the guide shaft; the right end of the guide shaft is connected to the inner side of the left end of the screw plug; the outer side of the left end of the screw plug is connected to the right end of the second cavity. The present invention can automatically disconnect the switch machine action circuit when the hand crank is inserted, and automatically restore the power supply of the switch machine action circuit when the hand crank is removed, thereby effectively protecting the personal safety of manual operators.

Description

Technical Field

[0001] The invention relates to the technical field of railway turnout switching equipment, in particular to an automatic power-off device with a hand crank for an electric switch machine. Background Art

[0002] A switch machine is an important signal infrastructure equipment used to reliably convert the switch position, change the direction of switch opening, lock the switch point rail, and reflect the switch position. It can well ensure driving safety, improve transportation efficiency, and improve the labor intensity of drivers.

[0003] The main functions of the electric switch are to convert and lock the point rail, change the opening direction of the turnout and reflect the position status of the point rail through the contact. It is one of the important equipment to ensure the efficient, safe and orderly operation of railway transportation.

[0004] Currently, when manually operating an electric switch, the safety switch must first be manually disconnected. Then, the hand crank must be used to manually crank the switch (to activate the electric switch reducer, enabling the switch to change the switch position). After the operation is completed and the hand crank is removed, the safety switch must be manually restored. The safety switch is connected in series with the switch's operating circuit. With the safety switch disconnected, the switch cannot operate even if power is accidentally applied in the control room. This personal protection solution effectively protects the personal safety of railway operators and is widely adopted in the railway signaling industry.

[0005] However, some customers have put forward new requirements for electric switch machines, requiring that the switch machine action circuit where the switch machine's safety switch is located should automatically cut off the power when the hand crank is inserted and automatically restore the power supply when the hand crank is removed.

[0006] Therefore, there is an urgent need to develop a technology that can meet the new requirements of customers, effectively protect the personal safety of manual operators of electric switch machines, and avoid harm to operators. Summary of the Invention

[0007] The purpose of the present invention is to provide an automatic power-off device for an electric switch machine using a hand crank to address the technical defects of the prior art.

[0008] To this end, the present invention provides an automatic power-off device for an electric switch machine using a hand crank, comprising a switch base and a hand crank;

[0009] The left end of the switch seat has a first cavity in the shape of a circular tube that runs longitudinally through it;

[0010] The first cavity is used for longitudinally inserting the crank joint on the hand crank;

[0011] The right end of the switch seat is provided with a transversely distributed, tubular second cavity;

[0012] The second cavity and the first cavity are vertically connected to each other;

[0013] On the upper and lower sides of the right end of the switch seat, there is a vertically penetrating long circular groove;

[0014] The second cavity is located between the two long circular grooves, and the upper and lower sides of the second cavity are respectively connected to the adjacent sides of the two long circular grooves;

[0015] A quick-acting switch is provided on each of the two long circular grooves;

[0016] Two snap-action switches are symmetrically distributed up and down;

[0017] The second cavity is provided with a switch shaft distributed laterally;

[0018] A laterally distributed return spring is provided at the right end of the switch shaft;

[0019] The return spring is sleeved on the outer side of the left end of a guide shaft;

[0020] The right end of the guide shaft is connected to the inner side of the left end of a screw plug;

[0021] The outer side of the left end of the screw plug is threadedly connected to the right end of the second cavity.

[0022] Preferably, one end of the hand crank is provided with a crank joint;

[0023] One end of the crank joint is fixedly connected to the crank rod via a connecting pin;

[0024] The other end of the crank joint is used to connect to the hand crank shaft on the existing electric switch reducer after being inserted through the first cavity.

[0025] Preferably, a mounting flange is provided at the rear end of the first cavity;

[0026] Four first cavity mounting holes are evenly spaced around the edges of the mounting flange;

[0027] The inner side of the mounting flange is provided with surrounding stoppers;

[0028] The stopper is used to match and dock with the hand-crank shaft bearing mounting hole on the existing electric switch reducer;

[0029] The rear end of the first cavity is connected to a mounting hole reserved on the existing electric switch reducer through the mounting flange.

[0030] Preferably, the second cavity comprises laterally distributed, hollow second cavity cylindrical holes;

[0031] The left side of the cylindrical hole of the second cavity is connected to the right side of the first cavity;

[0032] A switch shaft capable of sliding laterally is arranged in the cylindrical hole of the second cavity.

[0033] Preferably, the right end of the second cavity is provided with a transversely distributed, hollow, second cavity right end opening internal threaded section;

[0034] The left side of the internal threaded section of the right end opening of the second cavity is connected to the right side of the cylindrical hole of the second cavity;

[0035] a right side opening of the internal threaded section at the right end opening of the second cavity;

[0036] The internal thread section of the opening at the right end of the second cavity is threadedly connected to the external thread of the screw plug provided on the outer side of the left end of the screw plug.

[0037] Preferably, when the crank joint of the hand crank is not inserted into the first cavity, the outer surface of the small cylindrical section of the switch shaft contacts the roller on the snap-action switch;

[0038] a switch shaft, for pushing the roller on the quick-action switch upward when the crank connector of the hand crank is inserted into the first cavity, thereby disconnecting the contacts on the quick-action switch and thereby disconnecting the switch machine operating circuit; and for pushing the roller on the quick-action switch downward when the crank connector of the hand crank is removed from the first cavity, thereby closing the contacts on the quick-action switch and thereby connecting the switch machine operating circuit;

[0039] The contacts on the quick-acting switch are connected in series in the switch machine action circuit.

[0040] Preferably, the right end of the switch shaft is provided with a switch shaft cylindrical hole which is distributed laterally and opened on the right side;

[0041] The return spring is installed in the cylindrical hole of the switch shaft;

[0042] The left and right ends of the guide shaft are respectively provided with a spring insertion rod and an external threaded portion at the right end of the guide shaft;

[0043] The guide shaft is provided with a flat bar at a position between the spring insertion rod and the external threaded portion at the right end of the guide shaft;

[0044] A spring insertion rod is plugged into the return spring;

[0045] The external threaded portion at the right end of the guide shaft is threadedly connected to the internal threaded hole of the screw plug provided on the inner side of the left end of the screw plug;

[0046] The reset spring is used to allow the left end extension of the switch shaft to extend into the first cavity when the hand crank is not inserted into the first cavity, and to elastically reset the left end extension of the switch shaft when the hand crank is removed from the first cavity.

[0047] Preferably, the top surface and the bottom surface of the switch seat are each provided with a switch seat threaded hole on the left and right sides of the oblong groove;

[0048] Each snap-action switch has a housing mounting block disposed horizontally on the left and right sides respectively;

[0049] The two housing mounting blocks are correspondingly mounted on a threaded hole of a switch seat by screws;

[0050] A washer is provided between the nut of the screw and the threaded hole of the switch seat;

[0051] The screw passes vertically through the inner hole of the washer.

[0052] Preferably, the middle portion of the switch shaft has a large cylindrical section and a small cylindrical section distributed laterally;

[0053] The large cylindrical section and the small cylindrical section are connected by an inclined transition section;

[0054] The left side of the large cylindrical section is connected to the right end of the left extension;

[0055] The left end portion of the left end extension is in a smooth hemispherical shape;

[0056] The diameter of the large cylindrical section is larger than the diameter of the small cylindrical section;

[0057] The diameter of the slope transition section gradually decreases from left to right;

[0058] The cross-section of the inclined transition section is in the shape of a truncated cone.

[0059] Preferably, the switch seat is arranged on the existing electric switch reducer;

[0060] The electric switch machine reducer is arranged in the hollow box of the electric switch machine;

[0061] The box body has a cover that can be rotated to open;

[0062] A crank hole is provided on the front side of the cover at a position corresponding to the front end opening of the first cavity on the switch seat;

[0063] A detachable crank hole cover is provided on the crank hole for sealing;

[0064] The crank hole is used to allow the crank connector of the hand crank to be inserted through the first cavity and then connected to the hand crank shaft on the existing electric switch reducer.

[0065] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides an automatic power-off device for an electric switch machine with a hand crank. The device is scientifically designed and can automatically disconnect the switch machine action circuit when the hand crank is inserted, and automatically restore the power supply of the switch machine action circuit when the hand crank is removed, thereby effectively protecting the personal safety of the manual operator of the electric switch machine and avoiding harm to the operator, which has great practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic diagram of the three-dimensional structure of an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0067] Figure 2 A front view of an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0068] Figure 3 A front view of a hand crank equipped with an automatic power-off device for an electric switch provided by the present invention;

[0069] Figure 4 A schematic diagram of the three-dimensional structure of a switch seat in an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0070] Figure 5 A top view of a switch seat in an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0071] Figure 6 for Figure 5 A cross-sectional view taken along line AA is shown;

[0072] Figure 7 for Figure 6 A cross-sectional view taken along line BB;

[0073] Figure 8 A front view of a switch shaft in an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0074] Figure 9a A front view of a guide pin in an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0075] Figure 9b This is a left side view of a guide pin in an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0076] Figure 10 A front view of a screw plug in an automatic power-off device for an electric switch machine using a hand crank provided by the present invention;

[0077] Figure 11A schematic diagram of the three-dimensional structure of an embodiment of any one of the snap-action switches (which is an existing snap-action switch) in the automatic power-off device for a hand crank of an electric switch provided by the present invention;

[0078] Figure 12 A three-dimensional view of an automatic power-off device for a hand crank of an electric switch provided by the present invention, installed on a motor gearbox of the electric switch;

[0079] Figure 13 The present invention provides a three-dimensional view of an electric switch reducer equipped with an automatic power-off device for an electric switch machine using a hand crank, installed on the electric switch machine.

[0080] In the figure: 1- switch seat; 2- switch shaft; 3- return spring; 4- guide pin; 5- screw plug;

[0081] 6-Snap-action switch; 7-Screw; 9-Crank joint; 10-Connecting pin; 11-Crank rod;

[0082] 12-Electric switch reducer; 13-Electric switch. DETAILED DESCRIPTION

[0083] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0085] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0086] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0087] See also Figures 1 to 13 The present invention provides an automatic power-off device for an electric switch machine using a hand crank, comprising a switch base 1 and a hand crank 100;

[0088] The left end of the switch seat 1 has a first cavity 101 that is longitudinally through and in a circular tubular shape;

[0089] The first cavity 101 is used for longitudinally inserting the crank connector 9 on the hand crank 100;

[0090] At the right end of the switch seat 1, a transversely distributed, tubular second cavity 102 is provided;

[0091] The second cavity 102 and the first cavity 101 are vertically connected to each other;

[0092] A vertically penetrating long circular groove 105 is provided on the upper and lower sides of the right end of the switch seat 1;

[0093] The second cavity 102 is located between the two oblong grooves 105 , and the upper and lower sides of the second cavity 102 are respectively connected to the adjacent sides of the two oblong grooves 105 ;

[0094] A quick-acting switch 6 is provided on each of the two oblong grooves 105;

[0095] The two snap switches 6 are symmetrically distributed up and down;

[0096] The second cavity 102 is provided with a switch shaft 2 distributed laterally;

[0097] A transversely distributed return spring 3 is provided at the right end of the switch shaft 2;

[0098] The return spring 3 is sleeved on the outer side of the left end of a guide shaft 4;

[0099] The right end of the guide shaft 4 is connected to the inner side of the left end of a screw plug 5;

[0100] The outer side of the left end of the screw plug 5 is threadedly connected to the right end of the second cavity 102 .

[0101] In the present invention, in a specific implementation, one end of the hand crank 100 is provided with a crank joint 9;

[0102] One end of the crank joint 9 is fixedly connected to the crank rod 11 through a connecting pin 10.

[0103] It should be noted that the other end of the crank connector 9 is used to connect to the hand crank shaft on the existing electric switch reducer 12 after being inserted through the first cavity 101 (the hand crank shaft is located inside the hand crank shaft bearing mounting hole of the existing electric switch reducer 12).

[0104] In the present invention, in a specific implementation, the left side of the second cavity 102 is connected to the right side of the first cavity 101 .

[0105] In the present invention, in a specific implementation, a mounting flange 104 is provided at the rear end of the first cavity 101;

[0106] Four first cavity mounting holes 1040 are evenly spaced around the edges of the mounting flange 104;

[0107] The inner side of the mounting flange 104 is provided with surrounding stoppers 103;

[0108] The stopper 103 is used to match and dock with the hand-crank shaft bearing mounting hole on the existing electric switch reducer 12;

[0109] The rear end of the first cavity 101 is connected to the mounting hole reserved on the existing electric switch reducer 12 through the mounting flange 104 (specifically, through connecting screws).

[0110] It should be noted that, through the above design, the existing electric switch reducer 12 can be easily modified. It is only necessary to remove the original bearing end cover and then install the switch base 1 on the existing electric switch reducer 12. The switch base can be fixed to the electric switch reducer through the four first cavity mounting holes on the mounting flange 104 on the switch base 1.

[0111] In the present invention, in a specific implementation, the second cavity 102 includes laterally distributed, hollow second cavity cylindrical holes 107;

[0112] The left side of the second cavity cylindrical hole 107 is connected to the right side of the first cavity 101;

[0113] A switch shaft 2 that can slide laterally is disposed in the cylindrical hole 107 of the second cavity.

[0114] In specific implementation, the right end of the second cavity 102 is provided with a transversely distributed, hollow second cavity right end opening internal thread section 106;

[0115] The left side of the internal threaded section 106 at the right end opening of the second cavity is connected to the right side of the cylindrical hole 107 of the second cavity;

[0116] The right end opening of the second cavity is the right side opening of the internal thread section 106;

[0117] The internal thread section 106 at the right end opening of the second cavity is threadedly connected to the external screw thread 502 provided on the outer side of the left end of the screw plug 5 .

[0118] It should be noted that the switch shaft 2 is installed in the second cavity cylindrical hole 107 on the second cavity 102 . The switch shaft 2 can slide freely in the second cavity cylindrical hole 107 , and there is a clearance fit between the switch shaft 2 and the second cavity cylindrical hole 107 .

[0119] In the present invention, in a specific implementation, a switch shaft cylindrical hole 203 is provided at the right end of the switch shaft 2, which is distributed laterally and opened on the right side;

[0120] The return spring 3 is installed in the cylindrical hole 203 of the switch shaft;

[0121] The left and right ends of the guide shaft 4 are provided with a spring insertion rod 401 and an external threaded portion 402 at the right end of the guide shaft respectively;

[0122] The spring insertion rod 40 is plugged into the return spring 3;

[0123] The external threaded portion 402 at the right end of the guide shaft is threadedly connected to the internal threaded hole 501 of the screw plug 5 on the inner side of the left end;

[0124] The reset spring 3 is used to allow the left end extension 201 of the switch shaft 2 to extend into the first cavity 101 (only a small section) when the hand crank 100 is not inserted into the first cavity 101, and to elastically reset the left end extension 201 of the switch shaft 2 when the hand crank 100 is removed from the first cavity 101.

[0125] In a specific implementation, the guide shaft 4 is provided with a flat 404 at a position between the spring insertion rod 401 and the external threaded portion 402 at the right end of the guide shaft.

[0126] It should be noted that the return spring 3 maintains the switch shaft 2 in the extended position through its spring force and elastically returns the switch shaft 2 to its original position when the hand crank is removed. To prevent the return spring 3 from tilting, a guide pin 4 is provided. This pin is secured to the internally threaded hole 501 of the screw plug 5 via the externally threaded portion 402 on the right end of the guide shaft. To facilitate tightening, a flat 404 is provided on the guide pin 4.

[0127] It should be noted that the main function of the screw plug 5 is to provide support for the switch shaft 2 and the return spring 3 .

[0128] In the present invention, the specific implementation is as follows: Figure 5 As shown, the top and bottom surfaces of the switch base 1 are each provided with a switch base threaded hole 108 on the left and right sides of the oblong groove 105;

[0129] Each snap-action switch 6 has a housing mounting block disposed horizontally on the left and right sides respectively;

[0130] The two housing mounting blocks are correspondingly mounted on a threaded hole 108 of the switch seat by means of screws 7 .

[0131] In specific implementation, a washer is provided between the nut of the screw 7 and the threaded hole 108 of the switch seat;

[0132] The screw 7 passes vertically through the inner hole of the washer.

[0133] In the present invention, in a specific implementation, the middle portion of the switch shaft 2 has a large cylindrical section 202 and a small cylindrical section 204 distributed laterally;

[0134] The large cylindrical section 202 and the small cylindrical section 204 are connected via an inclined transition section 205;

[0135] The left side of the large cylindrical section 202 is connected to the right end of the left end extension 201;

[0136] The left end portion of the left end extension portion 201 is in the shape of a smooth hemispherical shape;

[0137] The diameter of the large cylindrical section 202 is larger than the diameter of the small cylindrical section 204;

[0138] The diameter of the inclined transition section 205 gradually decreases from left to right;

[0139] In a specific implementation, the diameter of the left end extension 201 is smaller than the diameter of the large cylindrical section 202 .

[0140] In a specific implementation, the cross-section of the inclined transition section 205 is in the shape of a truncated cone.

[0141] In a specific implementation, the switch shaft cylindrical hole 203 is located at the right end portion of the large cylindrical section 202 , the inner side of the inclined transition section 205 and the small cylindrical section 204 .

[0142] It should be noted that when the electric switch is operating normally, the left end extension 201 of the switch shaft 2 is maintained in the extended position under the spring force of the return spring 3, and the two rollers 601 on the two snap switches 6 are in contact with the outer surface of the small cylindrical section 204 on the switch shaft 2.

[0143] When the crank connector 9 of the hand crank 100 is inserted into the first cavity 101, the crank connector 9 connects to the hand crank shaft on the existing electric switch reducer 12, and the left end extension 201 of the switch shaft 2 moves to the right under the action of the crank connector 9. When the switch shaft 2 moves to the right, the two rollers 601 on the two quick-acting switches 6 move upward along the inclined surface of the inclined transition section 205 of the switch shaft 2 until the contacts of the quick-acting switch 6 are disconnected.

[0144] As the hand crank 100 continues to be inserted, the switch shaft 2 continues to move to the right, and the two rollers 601 on the two snap switches 6 climb to the surface of the large cylindrical section 202 on the switch shaft 2. When the switch shaft 2 continues to move, the two rollers 601 on the two snap switches no longer continue to climb.

[0145] Specifically, the snap-action switch 6 employed in the present invention has its contacts normally closed. However, when the crank connector 9 of the hand crank 100 is inserted into the first cavity 101, pushing the left extension 201 of the switch shaft 2 rightward, causing the roller 601 on the snap-action switch 6 to move upward a predetermined distance S1, the contacts of the snap-action switch 6 are instantly opened. This feature ensures that the contacts of the snap-action switch 6 are disconnected only when the hand crank 100 is fully inserted, thereby disconnecting the switch mechanism's operating circuit.

[0146] Similarly, when the crank connector 9 of the hand crank 100 is removed from the first cavity 101, the left extension 201 of the switch shaft 2 resets to the left, causing the roller 601 on the snap-action switch 6 to move downward a preset distance S2. Only then will the contacts of the snap-action switch 6 instantaneously close, energizing the switch mechanism circuit. It should be noted that if the roller 601 does not move downward by the preset distance S2, the contacts of the snap-action switch 6 will not close. This characteristic ensures that during manual switching (i.e., manually driving the electric switch mechanism reducer), even if the hand crank shakes (i.e., slightly touches the left extension 201 of the switch shaft 2), the roller 601 on the snap-action switch 6 will not close. Furthermore, requiring the preset distance S1 to be greater than S2 ensures that the contacts of the snap-action switch 6 will only close when the hand crank is completely disengaged from the switch mechanism hand crank shaft.

[0147] It should be noted that in order to ensure that the power supply of the switch machine can be disconnected (i.e., the switch machine operation circuit is disconnected) when the contacts on the quick-acting switch 6 are disconnected, the contacts on the quick-acting switch 6 are connected in series in the power supply circuit of the switch machine (i.e., the switch machine operation circuit).

[0148] It should be noted that, in the present invention, when the electric switch is operating normally (at this time, the crank connector of the hand crank 100 is not inserted into the first cavity 101), the outer surface of the small cylindrical section 204 of the switch shaft 2 contacts the roller 601 on the snap-action switch 6;

[0149] The switch shaft 2 is used to push the roller 601 on the quick-action switch 6 upward when the crank joint 9 of the hand crank 100 is inserted into the first cavity 101 (at this time, the left end protrusion 201 of the switch shaft 2 is pushed to the right by the crank joint 9, and the roller 601 on the quick-action switch 6 moves from right to left relative to the switch shaft 2 and is raised in height), so that the contacts on the quick-action switch 6 are disconnected, thereby disconnecting the switch machine operation circuit; and when the crank joint 9 of the hand crank 100 is removed from the first cavity 101, push the roller 601 on the quick-action switch 6 downward (at this time, the left end protrusion 201 of the switch shaft 2 is no longer pushed to the right by the crank joint 9, and the left end protrusion 201 returns to the left, thereby moving the roller 601 on the quick-action switch 6 from left to right relative to the switch shaft 2 and being lowered in height), so that the contacts on the quick-action switch 6 are closed, thereby connecting the switch machine operation circuit;

[0150] The contacts on the quick-acting switch 6 are connected in series in the power supply circuit of the switch machine (i.e. the switch machine action circuit).

[0151] It should be noted that the roller 601 on the quick-acting switch 6 can move upward under the action of an external force (specifically the switch shaft 2), and the roller 601 can move downward under the action of an external force (specifically the switch shaft 2), and as the moving distance and moving direction of the roller 601 are different, the working state of the upper contact of the quick-acting switch 6 can be adjusted accordingly, so that the contact is opened or closed, thereby correspondingly disconnecting or connecting the power supply line of the switch machine (i.e., the switch machine action circuit) connected in series with the contacts on the quick-acting switch 6.

[0152] It should be noted that the quick-acting switch 6 is an existing quick-acting switch, and the roller 601 thereon can move upward and downward, and as the upward and downward moving distances of the roller 601 are different, the working state of the contacts on the quick-acting switch 6 can be adjusted (open or closed).

[0153] It should be noted that the selection of the upward disconnect stroke S1 and downward connect stroke S2 ​​of the snap-action switch 6 is related to the horizontal distance of the switch shaft when the hand crank is inserted. This ensures that when the hand crank is inserted and just engages the hand crank shaft on the reducer, the switch shaft can force the snap-action switch roller to rise to the distance S1, thereby disconnecting the contacts. When the hand crank is removed and the hand crank shaft on the reducer is disengaged, the switch shaft resets, and the roller on the snap-action switch moves downward under the action of the spring until it reaches S2, connecting the motor power circuit (i.e., the switch operating circuit).

[0154] In the present invention, the preset distances S1 and S2 are both vertical distances. The preset distance S1 is the distance that the roller 601 moves upward in the vertical direction (i.e., the height it is lifted); the preset distance S2 is the distance that the roller 601 moves downward in the vertical direction (i.e., the height it is lowered).

[0155] In the present invention, each quick-action switch 6 has a roller 601; the two rollers 601 are symmetrically arranged up and down, and the two power supply lines can be disconnected by the contacts on the quick-action switch 6 controlled by the two rollers 601 respectively.

[0156] In the present invention, the snap-action switch 6 is a snap-action switch of the type S800 produced by Schaltberg GmbH of Germany. Figure 11 As shown, the snap-action switch 6 has two sets of terminals: the upper set contains two normally open contact terminals 61, and the lower set contains two normally closed contact terminals 62. A push rod 63, under the action of a spring 64, maintains the snap-action switch in the normally open contact state (i.e., the two normally closed contact terminals 62 are connected). When the roller 601 moves upward, it pushes the push rod 63 upward, thereby driving the contacts of the snap-action switch 6 to open (i.e., the two normally closed contact terminals 62 are disconnected). It should be noted that the motor power supply line (i.e., the power supply line for the switch operating circuit) of the present invention is connected in series to the normally closed contact terminals 62 on the lower layer of the snap-action switch 6, while the normally open contact terminals on the upper layer of the snap-action switch 6 are idle (unused).

[0157] In the present invention, the specific implementation is as follows: Figure 12 、 Figure 13 As shown, the switch seat 1 is arranged on the existing electric switch reducer 12;

[0158] The electric switch machine reducer 12 is arranged in the hollow box of the electric switch machine 13;

[0159] The box body has a cover 14 that can be rotated and opened (installed by a hinged manner);

[0160] A crank hole is provided on the front side of the cover 14 at a position corresponding to the front end opening of the first cavity 101 on the switch base 1;

[0161] A detachable crank hole cover 15 is sealed on the crank hole; the crank hole cover 15 can be unscrewed.

[0162] The crank hole is used to allow the crank connector 9 of the hand crank 100 to be inserted through the first cavity 101 and then connected to the hand crank shaft on the existing electric switch reducer 12.

[0163] It should be noted that the crank joint 9 has a hand-crank shaft docking groove 90 with an opening on the left side (the hand-crank shaft docking groove 90 includes three parts: a left section, a middle section and a right section that are sequentially connected. The left section is a cylindrical cavity, the middle section is a frustum-shaped cavity, and the right end section is a cavity with a rectangular longitudinal cross-section). The hand-crank shaft docking groove 90 is plugged into the hand-crank shaft on the existing electric switch reducer 12.

[0164] It should be noted that the two ends of the hand-cranked shaft on the existing electric switch reducer 12 can be connected to a set of devices of the present invention, such as Figure 12 shown.

[0165] It should be noted that the switch base 1 is mounted on the electric switch reducer 12 through the stop 103. After assembly is completed, the electric switch reducer 12 is mounted on the electric switch 13. When the electric switch 13 needs to be manually operated, if the machine cover 14 is not opened, the crank hole cover 15 on the machine cover 14 can be unscrewed, and then the hand crank 100 can be inserted to manually operate the electric switch 13. In addition, the machine cover 14 can also be opened and the hand crank 100 can be directly inserted to manually operate the electric switch 13. Regardless of the method, it can be ensured that when the hand crank is inserted, the action circuit of the switch machine is disconnected, and when the hand crank is removed, the power circuit of the switch machine is automatically disconnected.

[0166] In the present invention, the electric switch reducer is a component of the ZD(J)9 series electric switch manufactured by Tianjin Railway Signal Co., Ltd. Its function is to transmit the motor's rotational motion to the friction coupling on the ball screw, thereby driving the electric switch to switch points. To enable manual operation of the switch, a hand-crank gear and hand-crank shaft are provided on the electric switch reducer. Rotating the hand-crank shaft on the electric switch reducer with a hand crank allows manual operation of the switch to switch points.

[0167] Based on the above technical solution, the present invention comprises a switch assembly consisting of a switch base, a snap-action switch, a switch shaft, and a return spring, and a custom-designed hand crank. The switch shaft and return spring are mounted within the cavity of the switch base. Inserting the hand crank activates the switch shaft, disconnecting the snap-action switch contacts. Upon removal of the hand crank, the switch shaft resets under the action of the return spring, reconnecting the snap-action switch contacts. This achieves the function of automatically disconnecting the switch mechanism's operating circuit when the hand crank is inserted and automatically restoring it when the hand crank is removed after the operation is complete.

[0168] The present invention can prevent the switch machine from causing harm to maintenance personnel due to misoperation. At the same time, when the operation is completed and the hand crank is removed, the switch machine action circuit automatically restores power supply, preventing the maintenance personnel from forgetting to restore the circuit and causing the switch machine to fail to operate, thereby improving work efficiency and avoiding work errors.

[0169] To sum up, compared with the prior art, the present invention provides an automatic power-off device for an electric switch machine with a hand crank, which is scientifically designed and can automatically disconnect the switch machine action circuit when the hand crank is inserted, and automatically restore the power supply of the switch machine action circuit when the hand crank is removed, effectively protecting the personal safety of the manual operator of the electric switch machine and avoiding harm to the operator, which has great practical significance.

[0170] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic power-off device for an electric switch machine using a hand crank, characterized in that: It comprises a switch seat (1) and a hand crank (100); The left end of the switch seat (1) has a first cavity (101) that is longitudinally through and in the shape of a circular tube; A first cavity (101) is used for longitudinally inserting a crank connector (9) on a hand crank (100); A second cavity (102) in the shape of a circular tube and distributed laterally is provided at the right end of the switch seat (1); The second cavity (102) and the first cavity (101) are vertically connected to each other; A vertically penetrating long circular groove (105) is provided on the upper and lower sides of the right end of the switch seat (1); The second cavity (102) is located between the two long circular grooves (105), and the upper and lower sides of the second cavity (102) are respectively connected to the adjacent sides of the two long circular grooves (105); A quick-acting switch (6) is provided on each of the two oblong grooves (105); The two snap-action switches (6) are symmetrically distributed up and down; A switch shaft (2) is arranged on the second cavity (102) and is distributed laterally; A transversely distributed return spring (3) is provided at the right end of the switch shaft (2); A return spring (3) is sleeved on the outer side of the left end of a guide shaft (4); The right end of the guide shaft (4) is connected to the inner side of the left end of a screw plug (5); The outer side of the left end of the screw plug (5) is threadedly connected to the right end of the second cavity (102); The contacts on the quick-acting switch (6) are connected in series in the switch machine action circuit; One end of the hand crank (100) is provided with a crank joint (9); One end of the crank joint (9) is fixedly connected to the crank rod (11) via a connecting pin (10); The other end of the crank joint (9) is used to connect to the hand crank shaft on the existing electric switch reducer (12) after being inserted through the first cavity (101).

2. The automatic power-off device for an electric switch machine using a hand crank as claimed in claim 1, characterized in that: A mounting flange (104) is provided at the rear end of the first cavity (101); Four first cavity mounting holes (1040) are evenly spaced around the edges of the mounting flange (104); The inner side of the mounting flange (104) is provided with circumferentially distributed stoppers (103); The stopper (103) is used to match and dock with the hand-crank shaft bearing mounting hole on the existing electric switch reducer (12); The rear end of the first cavity (101) is connected to a mounting hole reserved on an existing electric switch reducer (12) through the mounting flange (104).

3. The automatic power-off device for an electric switch machine using a hand crank as claimed in claim 1, characterized in that: The second cavity (102) includes laterally distributed, hollow second cavity cylindrical holes (107); The left side of the cylindrical hole (107) of the second cavity is connected to the right side of the first cavity (101); A switch shaft (2) capable of sliding laterally is arranged in the cylindrical hole (107) of the second cavity.

4. The automatic power-off device for an electric switch machine using a hand crank as claimed in claim 3, characterized in that: The right end of the second cavity (102) is provided with a transversely distributed, hollow, second cavity right end opening internal thread section (106); The left side of the internal threaded section (106) at the right end opening of the second cavity is connected to the right side of the cylindrical hole (107) of the second cavity; The right side opening of the internal threaded section (106) at the right end of the second cavity; The internal thread section (106) at the right end opening of the second cavity is threadedly connected to the external screw thread (502) provided on the outer side of the left end of the screw plug (5).

5. The automatic power-off device for an electric switch machine using a hand crank as claimed in claim 1, characterized in that: When the crank joint of the hand crank (100) is not inserted into the first cavity (101), the outer surface of the small cylindrical section (204) of the switch shaft (2) contacts the roller (601) on the snap-action switch (6); The switch shaft (2) is used to push the roller (601) on the quick-acting switch (6) to move upward when the crank connector (9) of the hand crank (100) is inserted into the first cavity (101), so that the contacts on the quick-acting switch (6) are disconnected, thereby disconnecting the switch machine operation circuit; and to push the roller (601) on the quick-acting switch (6) to move downward when the crank connector (9) of the hand crank (100) is removed from the first cavity (101), so that the contacts on the quick-acting switch (6) are closed, thereby connecting the switch machine operation circuit.

6. The automatic power-off device for an electric switch machine using a hand crank according to any one of claims 1 to 5, characterized in that: The right end of the switch shaft (2) is provided with a switch shaft cylindrical hole (203) which is distributed laterally and opened on the right side; The return spring (3) is installed in the cylindrical hole (203) of the switch shaft; The left and right ends of the guide shaft (4) are respectively provided with a spring insertion rod (401) and an external threaded portion (402) at the right end of the guide shaft; The guide shaft (4) is provided with a flat (404) at a position between the spring insertion rod (401) and the external threaded portion (402) at the right end of the guide shaft; A spring insertion rod (401) is plugged into the return spring (3); The external threaded portion (402) at the right end of the guide shaft is threadedly connected to the internal threaded hole (501) of the screw plug provided on the inner side of the left end of the screw plug (5); The reset spring (3) is used to allow the left end extension (201) of the switch shaft (2) to extend into the first cavity (101) when the hand crank (100) is not inserted into the first cavity (101), and to elastically reset the left end extension (201) of the switch shaft (2) when the hand crank (100) is removed from the first cavity (101).

7. The automatic power-off device for an electric switch machine using a hand crank as claimed in claim 6, characterized in that: The top surface and the bottom surface of the switch seat (1) are both provided with a switch seat threaded hole (108) on the left and right sides of the oblong groove (105); Each snap-action switch (6) has a housing mounting block disposed horizontally on the left and right sides respectively; The two housing mounting blocks are correspondingly mounted on a threaded hole (108) of a switch seat by means of screws (7); A washer is provided between the nut of the screw (7) and the threaded hole (108) of the switch seat; The screw (7) passes vertically through the inner hole of the washer.

8. The automatic power-off device for an electric switch machine using a hand crank according to any one of claims 1 to 5, characterized in that: The middle portion of the switch shaft (2) has a large cylindrical section (202) and a small cylindrical section (204) distributed laterally; The large cylindrical section (202) and the small cylindrical section (204) are connected via an inclined transition section (205); The left side of the large cylindrical section (202) is connected to the right end of the left end extension (201); The left end portion of the left end extension portion (201) is in the shape of a smooth hemispherical shape; The diameter of the large cylindrical section (202) is larger than the diameter of the small cylindrical section (204); The diameter of the inclined transition section (205) gradually decreases from left to right; The cross-section of the inclined surface transition section (205) is in the shape of a truncated cone.

9. The automatic power-off device for an electric switch machine using a hand crank according to any one of claims 1 to 5, characterized in that: The switch seat (1) is arranged on an existing electric switch reducer (12); An electric switch machine reducer (12) is arranged in a hollow box of the electric switch machine (13); The box body has a cover (14) that can be rotated and opened; A crank hole is provided on the front side of the machine cover (14) at a position corresponding to the front end opening of the first cavity (101) on the switch seat (1); A detachable crank hole cover (15) is provided on the crank hole for sealing; The crank hole is used to allow the crank connector (9) of the hand crank (100) to be inserted through the first cavity (101) and then connected to the hand crank shaft on the existing electric switch reducer (12).

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