towing mechanism

Abstract

This utility model relates to a train pulling mechanism, which includes a housing assembly, a conductive connector, a contactor, a connecting assembly, a micro switch, and a power supply component. The conductive connector is slidably disposed within the housing assembly, with at least a portion extending beyond it. The contactor includes a contact end, a normally open contact, a coil, and an arc-extinguishing module. The coil has two coil contacts; when energized, the normally open contact closes. The arc-extinguishing module extinguishes the electric arc. One end of the connecting assembly is electrically connected to the normally open contact, and the other end is electrically connected to the locomotive. The contact end of the contactor is electrically connected to the conductive connector. The micro switch includes a connecting end, a normally closed end, a normally open end, and a control component. The two coil contacts are electrically connected to the power supply component and the normally open end, respectively. The power supply component is electrically connected to the connecting end. This train pulling mechanism can extinguish the electric arc promptly, preventing arcing and discharge at the conductive connector.

Description

Technical Field

[0001] This utility model relates to the field of railway locomotive technology, and in particular to a traction mechanism. Background Technology

[0002] Electric locomotives require regular maintenance after a period of operation. To ensure safety during maintenance and prevent accidents such as electric shock to maintenance personnel, the overhead contact line must be de-energized when maintenance is being carried out on the locomotive in the depot. However, when the overhead contact line is de-energized, the electric locomotive loses its high-voltage power supply and thus its power source for self-movement. In this situation, a traction bar is needed to provide power to the locomotive to ensure its normal movement.

[0003] In the existing technology, the structure of the traction bar is relatively simple. One end is made of copper rod machined into a cone shape, and the other end is inserted into the depot socket of the electric locomotive. The copper rod is in contact with the ground power source, so that the ground power source can supply power to the electric locomotive.

[0004] However, during the use of this traction bar, when the copper bar comes into contact with or is disconnected from the ground power supply, a violent discharge and arcing phenomenon often occurs due to the drastic change in the electric field. This discharge and arcing phenomenon may not only damage the equipment, but also pose a threat to the personal safety of the operators and surrounding personnel, and can easily cause personal injury. Utility Model Content

[0005] Therefore, it is necessary to provide a traction mechanism to address the problem of discharge and arcing that occurs at the moment the traction bar contacts or disconnects from the ground power supply.

[0006] A traction mechanism, comprising:

[0007] Housing components;

[0008] A conductive connector is slidably disposed within the housing assembly along a first direction, and at least a portion of the conductive connector extends out of the housing assembly;

[0009] A contactor includes a contact terminal, a normally open contact, and a coil. The coil has two coil contacts. When the coil is energized, the normally open contact closes. The contactor also includes an arc-extinguishing module for extinguishing an electric arc.

[0010] The connecting component has one end electrically connected to the normally open contact and the other end electrically connected to the locomotive; the contact end of the contactor is electrically connected to the conductive connector.

[0011] A micro switch and a power supply are provided. The micro switch is located above the conductive connector along the first direction. The micro switch includes a connection terminal, a normally closed terminal, a normally open terminal, and a control component. Two coil contacts are electrically connected to the power supply component and the normally open terminal, respectively. The power supply component is electrically connected to the connection terminal. In a first state, the control component is electrically connected to the normally closed terminal. In a second state, the conductive connector moves along the first direction toward the micro switch to press against the control component and make it electrically connected to the normally open terminal.

[0012] In one embodiment, the traction mechanism further includes:

[0013] An elastic element extends along the first direction, one end of the elastic element is connected to or abuts against the housing assembly, and the other end of the elastic element is connected to or abuts against the conductive connector. The elastic element is configured to drive the conductive connector to move away from the micro switch along the first direction.

[0014] In one embodiment, the elastic element is fitted around the outer periphery of the conductive connector.

[0015] In one embodiment, the housing assembly includes:

[0016] The housing has protruding connectors on both sides along the first direction, and the contactor and the power supply component are housed within the housing.

[0017] Two outer shells extending along the first direction are respectively inserted into two connectors. One outer shell has an opening at its end away from the receiving housing, and a portion of the conductive connector extends out of the outer shell assembly through the opening.

[0018] In one embodiment, the housing assembly further includes:

[0019] A limiting member is sleeved on one end of the outer shell with an opening. A limiting portion is protruding from the outer periphery of the conductive connector. The limiting portion can abut against the limiting member along the first direction to limit the extreme position of the conductive connector's movement along the first direction.

[0020] In one embodiment, there are multiple limiting portions, which are spaced apart around the outer periphery of the conductive connector.

[0021] In one embodiment, the limiting portion extends around the outer periphery of the conductive connector in a ring shape.

[0022] In one embodiment, the locomotive includes a depot socket, and the connection assembly includes:

[0023] One end of the cable is electrically connected to the normally open contact;

[0024] A plug is located at the other end of the cable, and the plug can be inserted into the socket.

[0025] In one embodiment, the outer peripheral wall of the socket is provided with a plurality of snap-fit ​​grooves at intervals, and the inner peripheral wall of the plug is provided with a plurality of snap-fit ​​protrusions at intervals. The snap-fit ​​protrusions can move in a direction perpendicular to the inner peripheral wall of the plug to extend or retract into the inner peripheral wall of the plug, and the plurality of snap-fit ​​protrusions can be engaged in the plurality of snap-fit ​​grooves one by one.

[0026] In one embodiment, the traction mechanism further includes:

[0027] A magnetic attractor is disposed on the outer periphery of the housing assembly, and the magnetic attractor is capable of adhering to the locomotive.

[0028] In the aforementioned traction mechanism, when it comes into contact with or is disconnected from the ground power supply, an electric arc is generated at the moment the normally open contact of the contactor closes or opens. The contactor includes an arc-extinguishing module, which can extinguish the electric arc in time, avoiding the phenomenon of arcing and discharge at the conductive joint, ensuring the personal safety of the operators and surrounding personnel, and preventing the electric arc from damaging the traction mechanism itself. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the traction mechanism provided in one embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of the traction mechanism with the outer shell assembly hidden, provided in an embodiment of the present invention.

[0031] Figure 3 The circuit diagram shows a traction mechanism provided in one embodiment of this utility model.

[0032] Figure 4 This is a cross-sectional view of the outer shell, limiting member, conductive connector, and elastic member provided in an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the structure of a conductive connector provided in an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the structure of a plug provided in an embodiment of the present invention.

[0035] The above figures include the following reference numerals:

[0036] 1000, Locomotive; 2000, Ground power supply;

[0037] 1. Outer shell assembly; 11. Receiving housing; 111. Connecting joint; 12. Outer shell; 121. Opening; 13. Limiting element;

[0038] 2. Conductive connector; 21. Limiting part;

[0039] 3. Contactor; 31. Contact terminal; 32. Normally open contact; 331. Coil contact;

[0040] 4. Connecting components; 41. Cable; 42. Plug; 421. Snap-fit ​​protrusion;

[0041] 5. Micro switch;

[0042] 6. Power supply components;

[0043] 7. Elastic components;

[0044] 8. Magnetic components. Detailed Implementation

[0045] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0046] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] like Figures 1-3As shown, one embodiment of the present invention provides a traction mechanism, which includes a housing assembly 1, a conductive connector 2, a contactor 3, a connecting assembly 4, a micro switch 5, and a power supply component 6. The conductive connector 2 is slidably disposed within the housing assembly 1 along the first direction, and at least a portion of the conductive connector 2 extends out of the housing assembly 1; the contactor 3 includes a contact end 31, a normally open contact 32, and a coil, the coil having two coil contacts 331, the normally open contact 32 closing when the coil is energized, the contactor 3 also includes an arc-extinguishing module for extinguishing the arc; one end of the connecting assembly 4 is electrically connected to the normally open contact 32, the other end of the connecting assembly 4 is electrically connected to the locomotive 1000, and the contact end 31 of the contactor 3 is electrically connected to the conductive connector 2; the micro switch 5 is located above the conductive connector 2 along the first direction, the micro switch 5 includes a connecting end, a normally closed end, a normally open end, and a control element, the two coil contacts 331 are electrically connected to the power supply element 6 and the normally open end respectively, the power supply element 6 is electrically connected to the connecting end, in the first state, the control element is electrically connected to the normally closed end, in the second state, the conductive connector 2 moves along the first direction toward the micro switch 5 to press against the control element so that it is electrically connected to the normally open end. Figure 1 , Figure 2 The X direction shown is the first direction.

[0052] like Figure 3As shown, it can be understood that the coils of the power supply component 6, the micro switch 5, and the contactor 3 form the control circuit, while the ground power supply 2000, the contactor 3, and the locomotive 1000 form the main circuit. When a towing operation is required, the other end of the connecting component 4 is first electrically connected to the locomotive 1000. Then, the operator holds the outer casing component 1 and moves the towing mechanism to the ground power supply 2000, making the conductive connector 2 contact the ground power supply 2000. Since the conductive connector 2 is slidably disposed inside the outer casing component 1 along the first direction, the conductive connector 2 can generate a displacement away from the ground power supply 2000 along the first direction, that is, a displacement towards the micro switch 5 along the first direction. The conductive connector 2 presses against the control component, making the control component electrically connected to the normally open terminal. At this time, the control circuit forms a closed loop, the coil of the contactor 3 is energized, causing the normally open contact 32 to close, thereby making the main circuit form a closed loop. The ground power supply 2000 can supply power to the locomotive 1000, causing the locomotive 1000 to move. When it is necessary to stop the towing operation, the operator holds the outer casing assembly 1 and moves the towing mechanism away from the ground power supply 2000. At this time, because the conductive connector 2 can slide relative to the outer casing assembly 1 in the first direction, the conductive connector 2 can generate displacement towards the ground power supply 2000 in the first direction under its own weight. At this instant, the conductive connector 2 is still in contact with the ground power supply 2000. However, since the conductive connector 2 has moved towards the ground power supply 2000 in the first direction, the conductive connector 2 is no longer pressing against the control component. The control component resets to the first state, the control circuit is disconnected, and the coil of the contactor 3 is de-energized. This causes the main circuit to disconnect, and the ground power supply 2000 no longer supplies power to the locomotive 1000.

[0053] Understandably, when the traction mechanism comes into contact with the ground power supply 2000, the conductive connector 2 first undergoes physical action, and then the normally open contact of the contactor 3 closes. The main circuit is activated after the normally open contact of the contactor 3 closes, and an electric arc is generated the instant the normally open contact of the contactor 3 closes. The contactor 3 includes an arc-extinguishing module, which can extinguish the electric arc. When the traction mechanism is disconnected from the ground power supply 2000, the normally open contact of the contactor 3 opens first, and the conductive connector 2 will still maintain a certain contact with the ground power supply 2000 for a short time. An electric arc is generated the instant the normally open contact of the contactor 3 opens, and the contactor 3 includes an arc-extinguishing module, which can extinguish the electric arc.

[0054] In this traction mechanism, when it comes into contact with or is disconnected from the ground power supply 2000, an electric arc is generated at the moment the normally open contact of the contactor 3 closes or opens. The contactor 3 includes an arc extinguishing module, which can extinguish the electric arc in time, avoiding the phenomenon of arcing and discharge at the conductive joint 2, ensuring the personal safety of the operators and surrounding personnel, and preventing the electric arc from damaging the traction mechanism itself.

[0055] It is worth mentioning that contactor 3 can be any existing contactor 3 with an arc-extinguishing module, and the specific structure and working principle of contactor 3 will not be elaborated. Similarly, the arc-extinguishing module can be an arc-extinguishing shroud or an arc-blowing coil, etc., and its specific structure and working principle will not be elaborated.

[0056] Optionally, the conductive connector 2 is made of a conductive material. In this embodiment, the conductive connector 2 is made of metal. Specifically, the conductive connector 2 is made of copper.

[0057] In this embodiment, the power supply component 6 is a lithium battery.

[0058] Optionally, such as Figure 2 , Figure 4 As shown, the traction mechanism also includes an elastic element 7, which extends along a first direction. One end of the elastic element 7 is connected to or abuts against the housing assembly 1, and the other end is connected to or abuts against the conductive connector 2. The elastic element 7 is configured to drive the conductive connector 2 to move away from the micro switch 5 along the first direction. When the conductive connector 2 is disconnected from the ground power supply 2000, the conductive connector 2 can move more quickly and stably towards the ground power supply 2000 along the first direction under the drive of the elastic element 7, preventing the conductive connector 2 from jamming and failing to move towards the ground power supply 2000 along the first direction when the traction mechanism is moved away from the ground power supply 2000.

[0059] In one alternative embodiment, such as Figure 2 , Figure 4 As shown, the elastic element 7 is sleeved on the outer periphery of the conductive connector 2. This arrangement makes full use of space without occupying too much space in the outer casing assembly 1, making the structure of the traction mechanism more compact.

[0060] Optionally, such as Figure 1 As shown, the housing assembly 1 includes a housing 11 and two housing bodies 12. The housing 11 has protruding connectors 111 on both sides along a first direction. The contactor 3 and the power supply component 6 are housed within the housing 11. The housing bodies 12 extend along the first direction, and each housing body 12 is inserted into one of the two connectors 111. One housing body 12 has an opening 121 at its end away from the housing 11, through which a portion of the conductive connector 2 extends out of the housing assembly 1. The housing 11 provides housing space for the contactor 3 and the power supply component 6, and isolates them from external dust and moisture. The protruding connectors 111 on both sides of the housing 11 provide stable connection points for the insertion of the housing bodies 12. The two housing bodies 12 are inserted into the connectors 111 to form the overall housing assembly 1. By configuring the housing assembly 1 as a separate housing box 11 and housing 12, it is convenient to assemble the contactor 3, power supply 6, conductive connector 2, micro switch 5 and conductive wire into the housing 12.

[0061] In one optional embodiment, the connector 111 has a socket, and the outer shell 12 is interference-fitted into the socket. In another optional embodiment, the connector 111 has a threaded hole, and the outer shell 12 is correspondingly provided with threads, and the outer shell 12 is threadedly connected to the connector 111.

[0062] One of the outer casings 12 has a through hole so that one end of the connecting component 4 can extend into the outer casing 1 through the through hole and be electrically connected to the normally open contact 32.

[0063] Optionally, such as Figure 1 , Figure 4 As shown, the outer casing assembly 1 also includes a limiting member 13, which is sleeved on one end of the outer casing 12 having an opening 121. A limiting portion 21 protrudes from the outer periphery of the conductive connector 2, and the limiting portion 21 can abut against the limiting member 13 in a first direction to limit the extreme position of the conductive connector 2's movement in the first direction. By providing the limiting member 13 and the limiting portion 21 on the outer periphery of the conductive connector 2, it is possible to prevent the conductive connector 2 from detaching from the outer casing 12 in the first direction.

[0064] In one optional embodiment, there are multiple limiting parts 21, which are spaced apart around the outer periphery of the conductive connector 2. During the movement of the conductive connector 2 in the first direction, the limiting parts 21 will generate an interaction force with the limiting member 13. The multiple limiting parts 21 spaced apart around the outer periphery can evenly distribute the force generated during limiting to various parts of the conductive connector 2, so that the conductive connector 2 is subjected to uniform force and is not prone to deformation.

[0065] In another alternative embodiment, such as Figure 5 As shown, the limiting part 21 extends around the outer periphery of the conductive connector 2 in a ring shape. During the movement of the conductive connector 2 in the first direction, the limiting part 21 interacts with the limiting member 13 to generate a force. The ring-shaped limiting part 21 can evenly distribute the force it bears to the entire circumference of the conductive connector 2, avoiding local stress concentration.

[0066] In one optional embodiment, the other end of the elastic member 7 is connected to or abuts against the limiting portion 21.

[0067] Specifically, the locomotive 1000 includes a depot socket, as in this embodiment, such as Figure 1 , Figure 2 As shown, the connecting component 4 includes a cable 41 and a plug 42. One end of the cable 41 is electrically connected to the normally open contact 32; the plug 42 is located at the other end of the cable 41 and can be inserted into a storage socket. The cable 41 has a certain degree of flexibility and length to adapt to the needs of towing, and is inserted into the storage socket through the plug 42 to form a good contact and ensure stable current transmission.

[0068] Optionally, such as Figure 6 As shown, the outer peripheral wall of the storage socket is provided with multiple locking slots at intervals, and the inner peripheral wall of the plug 42 is provided with several locking protrusions 421 at intervals. The locking protrusions 421 can move in a direction perpendicular to the inner peripheral wall of the plug 42 to extend or retract from the inner peripheral wall of the plug 42. The multiple locking protrusions 421 can be locked into the multiple locking slots one by one. When the plug 42 is inserted into the storage socket, the locking protrusions 421 extend and lock into the locking slots. This locking structure can fix the plug 42 and the socket in a direction perpendicular to the inner peripheral wall of the plug 42, effectively preventing the plug 42 from accidentally falling off due to vibration, shaking or external pulling during the operation of the locomotive 1000, and ensuring the continuity and stability of current transmission.

[0069] Optionally, such as Figure 1 As shown, the traction mechanism also includes a magnetic component 8, which is disposed on the outer periphery of the housing assembly 1 and can be attached to the locomotive 1000. When the locomotive 1000 needs to pass through a narrow space, there is no need to remove the traction mechanism; the traction mechanism can be directly attached to the locomotive 1000 via the magnetic component 8, making the operation more efficient.

[0070] Among them, the magnetic component 8 can be a magnet.

[0071] Specifically, the magnetic component 8 can be fixed to the outer periphery of the housing assembly 1 by adhesive, or a receiving groove can be provided on the outer periphery of the housing assembly 1 to hold the magnetic component 8 in the receiving groove. The specific setting method is not limited.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A traction mechanism, characterized in that, include: Housing assembly (1); A conductive connector (2) is slidably disposed within the housing assembly (1) along a first direction, and at least a portion of the conductive connector (2) extends out of the housing assembly (1). The contactor (3) includes a contact end (31), a normally open contact (32) and a coil. The coil has two coil contacts (331). When the coil is energized, the normally open contact (32) closes. The contactor (3) also includes an arc extinguishing module for extinguishing electric arcs. The connecting component (4) is electrically connected at one end to the normally open contact (32), and at the other end to the locomotive (1000). The contact end (31) of the contactor (3) is electrically connected to the conductive connector (2). A micro switch (5) and a power supply (6) are provided. The micro switch (5) is located above the conductive connector (2) along the first direction. The micro switch (5) includes a connection end, a normally closed end, a normally open end, and a control element. Two coil contacts (331) are electrically connected to the power supply element (6) and the normally open end, respectively. The power supply element (6) is electrically connected to the connection end. In the first state, the control element is electrically connected to the normally closed end. In the second state, the conductive connector (2) moves along the first direction toward the micro switch (5) to press the control element so that it is electrically connected to the normally open end.

2. The traction mechanism according to claim 1, characterized in that, The traction mechanism also includes: An elastic element (7) extends along the first direction, one end of which is connected to or abuts against the housing assembly (1), and the other end of which is connected to or abuts against the conductive connector (2). The elastic element (7) is configured to drive the conductive connector (2) to move away from the micro switch (5) along the first direction.

3. The traction mechanism according to claim 2, characterized in that, The elastic element (7) is sleeved on the outer periphery of the conductive connector (2).

4. The traction mechanism according to claim 1, characterized in that, The housing assembly (1) includes: The housing (11) has protruding connectors (111) on both sides along the first direction, and the contactor (3) and the power supply component (6) are housed in the housing (11). Two outer shells (12) extend along the first direction and are respectively inserted into two connectors (111). One of the outer shells (12) has an opening (121) at one end away from the housing (11), and a portion of the conductive connector (2) extends out of the outer shell assembly (1) through the opening (121).

5. The traction mechanism according to claim 4, characterized in that, The housing assembly (1) further includes: A limiting member (13) is sleeved on one end of the outer shell (12) with an opening (121). A limiting part (21) is protruding from the outer periphery of the conductive connector (2). The limiting part (21) can abut against the limiting member (13) along the first direction to limit the extreme position of the conductive connector (2) along the first direction.

6. The traction mechanism according to claim 5, characterized in that, The number of the limiting parts (21) is multiple, and the limiting parts (21) are distributed at intervals around the outer periphery of the conductive connector (2).

7. The traction mechanism according to claim 5, characterized in that, The limiting portion (21) extends around the outer periphery of the conductive connector (2) in a ring shape.

8. The traction mechanism according to claim 1, characterized in that, The locomotive (1000) includes a depot socket, and the connecting assembly (4) includes: One end of the cable (41) is electrically connected to the normally open contact (32); A plug (42) is provided at the other end of the cable (41), and the plug (42) can be inserted into the socket.

9. The traction mechanism according to claim 8, characterized in that, The outer peripheral wall of the socket is provided with a plurality of snap-fit ​​grooves at intervals, and the inner peripheral wall of the plug (42) is provided with a plurality of snap-fit ​​protrusions (421) at intervals. The snap-fit ​​protrusions (421) can move in a direction perpendicular to the inner peripheral wall of the plug (42) to extend or retract from the inner peripheral wall of the plug (42). The plurality of snap-fit ​​protrusions (421) can be snapped into the plurality of snap-fit ​​grooves one by one.

10. The traction mechanism according to claim 1, characterized in that, The traction mechanism also includes: A magnetic attractor (8) is disposed on the outer periphery of the outer shell assembly (1), and the magnetic attractor (8) can be attracted to the locomotive (1000).

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