Suspended monorail switch and control method

By adopting an L-shaped switch core and motor drive in the suspended monorail switch, convenient switching of the switch core is achieved, solving the problem of high maintenance costs caused by complex structure and improving operational efficiency and economy.

CN115323840BActive Publication Date: 2025-09-30CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP CO LTD
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Patent Information

Application Number
CN202210961051.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-11
Publication Date
2025-09-30
Estimated Expiration
2042-08-11

AI Technical Summary

Technical Problem

The existing suspended monorail switch has a complex structure, resulting in high operating and maintenance costs and complex conversion.

Method used

The straight and curved turnout cores with L-shaped structures are controlled by indicating signals to achieve convenient switching of the turnout cores, simplify the turnout component structure, and use motor drive and positioning locks to ensure stability and automatic control.

Benefits of technology

It realizes the rapid conversion of the switch center, reduces the operation and maintenance costs, and improves the economy and maintainability of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses a suspended monorail turnout and a control method, which belong to the field of rail transit technology. The suspended monorail turnout includes a turnout assembly and a switch core assembly. The turnout assembly includes an adjustment section, a straight section, a curved section and an outer shell. The two sides of the adjustment section are respectively connected with one side of the straight section and one side of the curved section, and the other side of the straight section and the other side of the curved section converge together. The outer shell is provided on the top of the adjustment section, the straight section and the curved section. The switch core assembly includes a straight turnout core and a curved turnout core. The straight turnout core and the curved turnout core can be respectively raised and lowered on the outer shell to connect the two sides of the adjustment section and the two sides of the straight section, or to connect the two sides of the adjustment section and the two sides of the curved section. The suspended monorail turnout provided by the embodiment of the present invention is not only simple in structure, but also can conveniently realize the switching of the switch core, thereby reducing the operation and maintenance costs of the entire suspended monorail turnout.
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Description

Technical Field

[0001] The present invention belongs to the technical field of rail transportation, and more specifically, relates to a suspended monorail switch and a control method thereof. Background Art

[0002] As a new type of rail transit with medium and low traffic volume, the suspended monorail has the advantages of small footprint, low construction cost, short construction period, small impact of construction on municipal traffic, simplicity and beauty due to its special operation form. It has broad application prospects in small and medium-sized cities and tourist attractions.

[0003] Turnouts are critical equipment in suspended monorail systems, with numerous, complex systems and crucial importance to the project. Existing suspended monorail turnouts have complex structures and complex switching, resulting in high operating and maintenance costs for the entire system. Summary of the Invention

[0004] In response to the above defects or improvement needs of the prior art, the present invention provides a suspended monorail switch and a control method, the purpose of which is not only simple in structure, but also convenient for switching the switch core, thereby reducing the operation and maintenance costs of the entire suspended monorail switch.

[0005] In a first aspect, the present invention provides a suspended monorail turnout, the suspended monorail turnout comprising a turnout assembly and a switch core assembly;

[0006] The turnout assembly includes an adjustment section, a straight section, a curved section, and a housing. Two sides of the adjustment section are respectively connected to one side of the straight section and one side of the curved section. The other side of the straight section and the other side of the curved section converge together. The housing is arranged on top of the adjustment section, the straight section, and the curved section.

[0007] The switch core assembly includes a straight switch core and a curved switch core, both of which are L-shaped structures. The straight switch core and the curved switch core can be arranged on the outer shell in a liftable manner to connect the two side edges of the adjustment section and the two side edges of the straight section, or to connect the two side edges of the adjustment section and the two side edges of the curved section.

[0008] Optionally, the housing has a straight track hole and a curved track hole, the straight track switch core can be slidably inserted in the straight track hole, and the curved track switch core can be slidably inserted in the curved track hole.

[0009] Optionally, the outer wall of the shell has two first slide columns and two second slide columns, the two first slide columns are located on both sides of the straight channel hole, and the two second slide columns are located on both sides of the curved channel hole, and the two ends of the straight channel switch core are respectively slidably matched with the two first slide columns, and the two ends of the curved channel switch core are respectively slidably matched with the two first slide columns.

[0010] Optionally, each of the first slide columns and each of the second slide columns is provided with a positioning lock to limit the sliding of the straight track switch core or the curved track switch core.

[0011] Optionally, the outer casing has two spaced-apart straight-track motors and a curved-track motor, the output shafts of the straight-track motor and the curved-track motor are respectively sleeved with drive gears, the straight-track switch core and the curved-track switch core are respectively provided with racks, the two drive gears and the two racks correspond one to one, and each drive gear is engaged with the corresponding rack to drive the straight-track switch core or the curved-track switch core to rise and fall.

[0012] Optionally, the number of the straight track motors and the number of the curved track motors are both 2, and the number of the racks on the straight track switch core and the number of the racks on the curved track switch core are both 2.

[0013] Optionally, the suspended monorail turnout further includes a control component, which includes a controller, a straight track position sensor, and a curved track position sensor. The straight track position sensor is used to monitor the position of the straight track turnout core, and the curved track position sensor is used to monitor the position of the curved track turnout core. The controller is electrically connected to the straight track motor, the curved track motor, the straight track position sensor, and the curved track position sensor, respectively.

[0014] Optionally, the straight track switch core includes a straight track guide plate and a straight track running plate arranged in an L shape, one end of the straight track guide plate has a straight track positioning plate, and the straight track positioning plate and the guide plate on the other side of the curved section are slidably matched.

[0015] Optionally, the curved track switch core includes a curved track guide plate and a curved track running plate arranged in an L-shape, one end of the curved track guide plate has a curved track positioning plate, and the curved track positioning plate and the guide plate on the other side of the straight section are slidably matched.

[0016] In a second aspect, the present invention provides a control method for a suspended monorail turnout. The control method is based on the suspended monorail turnout described in the first aspect, and the control method includes:

[0017] collecting the indication signal of the tram, and analyzing whether it is a straight-line driving signal according to the indication signal;

[0018] If the indication signal is a straight-line driving signal, the straight track switch core is lowered to the lowest position and the curved track switch core is raised to the highest position, so that the straight track switch core is connected to both sides of the adjustment section and both sides of the straight section; otherwise, the straight track switch core is raised to the highest position and the curved track switch core is lowered to the highest position, so that the curved track switch core is connected to both sides of the adjustment section and both sides of the straight section.

[0019] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0020] For a suspended monorail turnout provided in this embodiment, since the straight turnout core and the curved turnout core are both L-shaped structures, the straight turnout core and the curved turnout core can be respectively raised and lowered on the outer shell to connect the two side edges of the adjustment section and the two side edges of the straight section, or to connect the two side edges of the adjustment section and the two side edges of the curved section. The corresponding turnout core can be raised and lowered to the adjustment section at the lowest point and connected with the adjustment section through a specific indication signal, while the other turnout core is raised to the highest point to avoid interference with the operation of the train. The turnout assembly and the turnout core assembly of this device have a simple structure and are easy to switch, and rapid switching can be completed only by raising and lowering the straight turnout core and the curved turnout core.

[0021] Specifically, if the indication signal is a straight-line driving signal, the straight track switch core will be lowered to the lowest position, and the curved track switch core will be raised to the highest position (at this time the curved track switch core is in a avoidance state), so that the straight track switch core is connected to both sides of the adjustment section and both sides of the straight section. Otherwise, the straight track switch core will be raised to the highest position, and the curved track switch core will be lowered to the highest position (at this time the straight track switch core is in a avoidance state), so that the curved track switch core is connected to both sides of the adjustment section and both sides of the straight section, thereby completing the rapid switching of the switch core.

[0022] That is to say, the suspended monorail switch provided by the embodiment of the present invention not only has a simple structure, but also can conveniently realize the switching of the switch core, thereby reducing the operation and maintenance costs of the entire suspended monorail switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of a suspended monorail turnout provided by an embodiment of the present invention;

[0024] Figure 2 1 is a schematic structural diagram of a turnout assembly provided by an embodiment of the present invention;

[0025] Figure 3 is a partial schematic diagram of a turnout assembly provided by an embodiment of the present invention;

[0026] Figure 4 This is a schematic structural diagram of a straight track turnout provided by an embodiment of the present invention;

[0027] Figure 5This is a schematic structural diagram of a curved track switch provided by an embodiment of the present invention;

[0028] Figure 6 This is a first view of a suspended monorail turnout provided by an embodiment of the present invention in straight-line travel;

[0029] Figure 7 This is a second view of a suspended monorail turnout provided by an embodiment of the present invention in straight-line travel;

[0030] Figure 8 This is a first view of a suspended monorail turnout provided by an embodiment of the present invention during curved travel;

[0031] Figure 9 This is a second view of a suspended monorail turnout provided by an embodiment of the present invention during curved travel;

[0032] Figure 10 yes Figure 1 A partial enlarged view of

[0033] Figure 11 This is a flow chart of a control method for a suspended monorail switch provided by an embodiment of the present invention.

[0034] The symbols in the figure mean the following:

[0035] 1. Turnout assembly; 11. Adjustment section; 12. Straight section; 13. Curved section; 14. Casing; 141. Straight track hole; 142. Curved track hole; 143. First slide column; 144. Second slide column; 145. Positioning lock; 146. Straight track motor; 147. Curved track motor; 2. Turnout core assembly; 21. Straight track turnout core; 211. Straight track guide plate; 212. Straight track running plate; 213. Straight track positioning plate; 22. Curved track turnout core; 221. Curved track guide plate; 222. Curved track running plate; 223. Curved track positioning plate; 23. Rack. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0037] Figure 1 Schematic diagram of a suspended monorail switch provided by an embodiment of the present invention. Figure 1 As shown, the suspended monorail turnout includes a turnout assembly 1 and a turnout core assembly 2.

[0038] Figure 2is a structural diagram of a turnout assembly provided by an embodiment of the present invention, Figure 3 This is a partial schematic diagram of a turnout assembly provided by an embodiment of the present invention, combined with Figure 2 and Figure 3 As shown, the turnout assembly 1 includes an adjustment section 11, a straight section 12, a curved section 13 and a shell 14. The two sides of the adjustment section 11 are respectively connected to one side of the straight section 12 and one side of the curved section 13, and the other side of the straight section 12 and the other side of the curved section 13 converge together. The shell 14 is covered on the top of the adjustment section 11, the straight section 12 and the curved section 13.

[0039] Figure 4 This is a schematic structural diagram of a straight turnout core provided by an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of the curved track switch provided by an embodiment of the present invention, combined with Figure 4 and Figure 5 As shown, the switch core assembly 2 includes a straight switch core 21 and a curved switch core 22. Both the straight switch core 21 and the curved switch core 22 are L-shaped structures. The straight switch core 21 and the curved switch core 22 can be respectively raised and lowered on the outer shell 14 to connect the two side edges of the adjustment section 11 and the two side edges of the straight section 12, or to connect the two side edges of the adjustment section 11 and the two side edges of the curved section 13.

[0040] For a suspended monorail turnout provided in this embodiment, since the straight turnout core 21 and the curved turnout core 22 are both L-shaped structures, the straight turnout core 21 and the curved turnout core 22 can be respectively raised and lowered on the outer shell 14 to connect the two side edges of the adjustment section 11 and the two side edges of the straight section 12, or to connect the two side edges of the adjustment section 11 and the two side edges of the curved section 13. The corresponding turnout core can be raised and lowered to the adjustment section 11 at the lowest point and connected with the adjustment section 11 through a specific indication signal, while the other turnout core is raised to the highest point to avoid interference with the operation of the train. The turnout assembly 1 and the turnout core assembly 2 of this device have a simple structure and are easy to switch, and can be quickly switched only by raising and lowering the straight turnout core 21 and the curved turnout core 22.

[0041] Specifically, if the indication signal is a straight driving signal, the straight track switch core 21 is lowered to the lowest position, and the curved track switch core 22 is raised to the highest position (at this time, the curved track switch core 22 is in the avoidance state), so that the straight track switch core 21 conducts the two sides of the adjustment section 11 and the two sides of the straight section 12 (see Figure 6 and Figure 7 ), otherwise, the straight track switch core 21 is raised to the highest position, and the curved track switch core 22 is lowered to the highest position (the straight track switch core 21 is in the avoidance state at this time), so that the curved track switch core 22 is connected to both sides of the adjustment section 11 and both sides of the straight section 12 (see Figure 8 and Figure 9 ), so that the rapid switching of the switch core can be completed.

[0042] That is to say, the suspended monorail switch provided by the embodiment of the present invention not only has a simple structure, but also can conveniently realize the switching of the switch core, thereby reducing the operation and maintenance costs of the entire suspended monorail switch.

[0043] It is easy to understand that, as can be seen from the conventional suspended monorail, both sides of the adjustment section 11, the straight section 12 and the curved section 13 of the corresponding suspended monorail turnout are also L-shaped beam structures, the two L-shaped beam structures are arranged at intervals, and each side of the adjustment section 11, the straight section 12 and the curved section 13 includes a guide plate and a running board (see FIG. Figure 3 ).

[0044] In this embodiment, the L-shaped beam structures on both sides of the adjustment section 11 , the straight section 12 and the curved section 13 are connected as a whole through the outer shell 14 , thereby increasing the structural strength of the entire turnout assembly 1 .

[0045] See again Figure 2 The housing 14 has a straight hole 141 and a curved hole 142 , the straight switch core 21 can be slidably inserted into the straight hole 141 , and the curved switch core 22 can be slidably inserted into the curved hole 142 .

[0046] In the above embodiment, the straight channel hole 141 guides the raising and lowering of the straight channel switch core 21, while the curved channel hole 142 guides the outer wall of the curved channel switch core 22. Furthermore, the straight channel hole 141 and the curved channel hole 142 allow the straight channel switch core 21 or the curved channel switch core 22 to be retracted above the housing 14 when not in use.

[0047] In this embodiment, two first slide columns 143 and two second slide columns 144 are provided on the outer wall of the shell 14. The two first slide columns 143 are located on both sides of the straight channel hole 141, and the two second slide columns 144 are located on both sides of the curved channel hole 142. The two ends of the straight channel switch core 21 are respectively slidably matched with the two first slide columns 143, and the two ends of the curved channel switch core 22 are respectively slidably matched with the two first slide columns 143.

[0048] In the above embodiment, the first slide column 143 and the second slide column 144 support and guide the straight track switch core 21 and the curved track switch core 22 , thereby ensuring the stability of the straight track switch core 21 and the curved track switch core 22 .

[0049] Exemplarily, the first slide column 143 and the second slide column 144 have coaxially arranged strip grooves, and the straight track switch core 21 or the curved track switch core 22 is slidably engaged with the corresponding strip grooves.

[0050] Furthermore, each first slide column 143 and each second slide column 144 is inserted with a positioning lock 145 to limit the sliding of the straight track switch core 21 or the curved track switch core 22, thereby locking the switch core through the positioning lock 145 to maintain its stability in the locked state.

[0051] For example, the positioning lock 145 may be a latch pin, which is inserted into the through hole of the stud core to lock the stud core.

[0052] Figure 10 yes Figure 1 A partial enlarged view of Figure 10 As shown, the housing 14 has two spaced-apart straight-track motors 146 and curved-track motors 147, and the output shafts of the straight-track motors 146 and the curved-track motors 147 are respectively sleeved with drive gears. The straight-track switch core 21 and the curved-track switch core 22 are respectively provided with racks 23, and the two drive gears correspond to the two racks 23 one by one. Each drive gear is engaged with the corresponding rack 23 to drive the straight-track switch core 21 or the curved-track switch core 22 to rise and fall.

[0053] In the above embodiment, the driving gear is driven to rotate by the straight track motor 146 and the curved track motor 147, thereby driving the rack 23 to rise and fall, and then driving the switch core to rise and fall, so as to realize automation through the motor.

[0054] In addition, after the lifting of the fork core is completed, the two fork cores are locked respectively by the positioning lock 145.

[0055] For example, the number of the straight track motors 146 and the number of the curved track motors 147 are both two, and the number of the racks 23 on the straight track switch core 21 and the curved track switch core 22 are both two, thereby achieving smooth lifting and lowering of the switch core.

[0056] In this embodiment, the suspended monorail turnout also includes a control component (not shown in the figure), which includes a controller, a straight track position sensor and a curved track position sensor. The straight track position sensor is used to monitor the position of the straight track switch core 21, and the curved track position sensor is used to monitor the position of the curved track switch core 22. The controller is electrically connected to the straight track motor 146, the curved track motor 147, the straight track position sensor and the curved track position sensor, respectively.

[0057] In the above embodiment, the switch core can be automatically controlled by the control component.

[0058] For example, when the controller receives the indication signal, the controller controls the straight track motor 146 and the curved track motor 147 to perform corresponding lifting actions until the straight track position sensor and the curved track position sensor detect that the corresponding switch center reaches the target position and transmits the electrical signal to the controller, and the controller controls the corresponding motor to stop.

[0059] Combine Figure 4 and Figure 6 As shown, the straight track switch core 21 includes a straight track guide plate 211 and a straight track running plate 212 arranged in an L shape. One end of the straight track guide plate 211 has a straight track positioning plate 213, and the straight track positioning plate 213 and the guide plate on the other side of the curved section 13 are slidably matched.

[0060] In the above embodiment, the straight track switch core 21 will not only drive the straight track guide plate 211 and the straight track walking plate 212 to move during the descent process to achieve the connection between the adjustment section 11 and the straight segment 12, but also drive the straight track positioning plate 213 to descend, thereby eliminating the gap between the straight track guide plate 211 and the straight segment 12.

[0061] Similarly, the curved track switch core 22 includes a curved track guide plate 221 and a curved track running plate 222 arranged in an L shape. One end of the curved track guide plate 221 has a curved track positioning plate 223, and the curved track positioning plate 223 and the guide plate on the other side of the straight section 12 are slidably matched.

[0062] In the above embodiment, the curved track switch core 22 will not only drive the curved track guide plate 221 and the curved track walking plate 222 to move during the descent process to achieve the connection between the adjustment section 11 and the curved section 13, but also drive the curved track positioning plate 223 to descend, thereby eliminating the gap between the curved track guide plate 221 and the curved section 13.

[0063] Figure 11 This is a flow chart of a control method for a suspended monorail switch provided by an embodiment of the present invention. Figure 11 As shown, the control method is based on the above-mentioned suspended monorail switch, and the control method includes:

[0064] S101: Collect the indication signal of the tram, and analyze whether it is a straight-line driving signal according to the indication signal.

[0065] S102. If the indication signal is a straight driving signal, the straight track switch core 21 is lowered to the lowest position and the curved track switch core 22 is raised to the highest position, so that the straight track switch core 21 is connected to both sides of the adjustment section 11 and both sides of the straight section 12. Otherwise, the straight track switch core 21 is raised to the highest position and the curved track switch core 22 is lowered to the highest position, so that the curved track switch core 22 is connected to both sides of the adjustment section 11 and both sides of the straight section 12.

[0066] A suspended monorail turnout provided in an embodiment of the present invention connects an adjustment section 11 and a straight section 12, or connects an adjustment section 11 and a curved section 13, through a turnout core that can be independently raised and lowered vertically, thereby realizing conversion between straight-line driving and curved driving. The turnout core in this type of turnout is arranged on the outside of the top of the outer shell 14. It has a simple composition and a simple component structure. Being placed outside the main structure of the turnout can facilitate the installation and debugging of the equipment, and is also more convenient for operation and maintenance. The turnout core is light in weight, simple in movement, and short in stroke (linear movement corresponding to lifting and lowering). The conversion time between straight and curved lines is shorter, the power consumption of the equipment is low, and it is more economical and environmentally friendly. The molded straight turnout core 21 and the curved turnout core 22 are used as the turnout core, which has higher smoothness.

[0067] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A suspended monorail switch, characterized in that: The suspended monorail turnout comprises a turnout assembly (1) and a turnout core assembly (2); The switch assembly (1) comprises an adjustment section (11), a straight section (12), a curved section (13) and a housing (14); two sides of the adjustment section (11) are respectively connected to one side of the straight section (12) and one side of the curved section (13); the other side of the straight section (12) and the other side of the curved section (13) converge together; the housing (14) is provided on top of the adjustment section (11), the straight section (12) and the curved section (13); The switch core assembly (2) comprises a straight switch core (21) and a curved switch core (22), both of which are L-shaped structures. The straight switch core (21) and the curved switch core (22) are respectively arranged on the housing (14) in a liftable manner to connect the two sides of the adjustment section (11) and the two sides of the straight section (12), or connect the two sides of the adjustment section (11) and the two sides of the curved section (13); The straight track switch core (21) comprises a straight track guide plate (211) and a straight track running plate (212) arranged in an L-shape, one end of the straight track guide plate (211) is provided with a straight track positioning plate (213), and the straight track positioning plate (213) is slidably engaged with the guide plate on the other side of the curved section (13); The curved track switch core (22) comprises an L-shaped curved track guide plate (221) and a curved track running plate (222), one end of the curved track guide plate (221) is provided with a curved track positioning plate (223), and the curved track positioning plate (223) is in sliding engagement with the guide plate on the other side of the straight segment (12).

2. A suspended monorail switch according to claim 1, characterized in that: The housing (14) is provided with a straight track hole (141) and a curved track hole (142); the straight track switch core (21) is slidably inserted into the straight track hole (141); and the curved track switch core (22) is slidably inserted into the curved track hole (142).

3. The suspended monorail switch according to claim 2, characterized in that: Two first slide columns (143) and two second slide columns (144) are provided on the outer wall of the housing (14), the two first slide columns (143) are located on both sides of the straight channel hole (141), and the two second slide columns (144) are located on both sides of the curved channel hole (142), and the two ends of the straight channel switch core (21) are respectively slidably matched with the two first slide columns (143), and the two ends of the curved channel switch core (22) are respectively slidably matched with the two first slide columns (143).

4. The suspended monorail switch according to claim 3, characterized in that: Each of the first slideway columns (143) and each of the second slideway columns (144) is provided with a positioning lock (145) to limit the sliding of the straight track switch core (21) or the curved track switch core (22).

5. The suspended monorail switch according to claim 1, characterized in that: The housing (14) has two spaced-apart straight track motors (146) and a curved track motor (147), the output shafts of the straight track motor (146) and the curved track motor (147) are respectively sleeved with drive gears, the straight track switch core (21) and the curved track switch core (22) are respectively provided with racks (23), the two drive gears correspond to the two racks (23) in a one-to-one manner, and each drive gear is engaged with the corresponding rack (23) to drive the straight track switch core (21) or the curved track switch core (22) to rise and fall.

6. The suspended monorail switch according to claim 5, characterized in that: The number of the straight track motor (146) and the number of the curved track motor (147) are both two, and the number of the racks (23) on the straight track switch core (21) and the curved track switch core (22) are both two.

7. The suspended monorail switch according to claim 5, characterized in that: The suspended monorail switch also includes a control component, which includes a controller, a straight track position sensor, and a curved track position sensor. The straight track position sensor is used to monitor the position of the straight track switch core (21), and the curved track position sensor is used to monitor the position of the curved track switch core (22). The controller is electrically connected to the straight track motor (146), the curved track motor (147), the straight track position sensor, and the curved track position sensor, respectively.

8. A control method for a suspended monorail switch, characterized in that: The control method is based on the suspended monorail switch according to any one of claims 1 to 7, and the control method includes: collecting the indication signal of the tram, and analyzing whether it is a straight-line driving signal according to the indication signal; If the indication signal is a straight-line driving signal, the straight track switch core (21) is lowered to the lowest position, and the curved track switch core (22) is raised to the highest position, so that the straight track switch core (21) is connected to both sides of the adjustment section (11) and both sides of the straight-line section (12); otherwise, the straight track switch core (21) is raised to the highest position, and the curved track switch core (22) is lowered to the highest position, so that the curved track switch core (22) is connected to both sides of the adjustment section (11) and both sides of the straight-line section (12).