A switch machine and method based on linear motor variable frequency drive technology

Abstract

The present invention relates to a switch machine and method using a linear motor variable frequency drive technology, which are characterized in that they at least comprise: a housing (4), a linear motor (5), an action mechanism (6), a locking module (7), a detection mechanism (8), an electrical control interface (9), and a displacement sensor (10); the linear motor (5) is on a linear motor (5) mounting shaft in the housing (4); the linear motor (5) mounting shaft is fixed at both ends of the housing (4); the action mechanism (6), the detection mechanism (8), and the displacement sensor (10) are fixed on one side of the linear motor (5) mounting shaft in the housing (4); an electrical control interface (9) is provided on the housing (4); an external variable frequency power line is connected to the switch machine linear motor (5) through the electrical control interface (9); the switch machine and method using a linear motor variable frequency drive technology have a simple structure and high efficiency, and can achieve the purpose of adjusting the running speed and output force of the switch machine linear motor.

Description

Technical Field

[0001] The present invention belongs to the field of electromechanical technology, and relates to a mechatronics product for railway turnout conversion, more specifically, to a switch machine and method based on linear motor variable frequency drive technology, which can be used for turnout conversion in the fields of railways and urban rail transit. Background Art

[0002] The switch machine is a switching device for turnouts. Its main function is to switch and lock the turnout point rail, indicate and monitor the position and status of the turnout point rail or the heart rail in the interlocking area, and is of great significance for the automatic control and remote control of railway signal lights.

[0003] At present, the common switch machine models in China include ZD6, ZD9, ZY7, S700K, etc. Its main transmission modes include: rack and pinion transmission, ball screw transmission, hydraulic transmission, etc. The rack and pinion transmission has a simple structure, but the stroke should not be too long; although the ball screw transmission has a large stroke and high efficiency, the ball screw processing cost is high and the load-bearing capacity is low; the hydraulic pipeline of the hydraulic transmission is prone to aging, and the leakage of hydraulic oil will cause environmental pollution. At the same time, the temperature has a greater impact on the hydraulic switch machine. Therefore, an electric switch machine based on linear motor frequency conversion technology was born, which is characterized by a simple structure, a motor directly driving the action rod, no intermediate transmission link, and high mechanical transmission efficiency. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to propose a switch machine and method based on linear motor variable frequency drive technology with simple structure and high efficiency, so as to achieve the purpose of adjusting the operating speed and output force of the linear motor of the switch machine.

[0005] The objective of the present invention is achieved in this way. It relates to a switch machine based on linear motor variable frequency drive technology, which is characterized in that: it at least includes a shell, a linear motor, an action mechanism, a locking module, a detection mechanism, an electrical control interface, and a displacement sensor. The secondary of the linear motor is on the primary mounting shaft of the linear motor in the shell, and the primary of the linear motor is fixedly installed at both ends of the shell; on one side of the linear motor in the shell, a guided fixed action mechanism and a detection mechanism are provided, and the locking module and the displacement sensor are fixed. There is an electrical control interface on the shell, and an external variable frequency power supply line is connected to the linear motor of the switch machine through the electrical control interface; after the switch machine is switched to a certain position, the controller judges the status of the switch machine and the external turnout through the electrical control interface by the stroke of the linear motor, the action mechanism, the detection mechanism, and the displacement sensor in the shell. After all are in place, the controller controls the variable frequency power supply to energize the locking unit to lock the action rod and the detection rod.

[0006] The linear motor comprises: a primary of the linear motor and a secondary of the linear motor; the actuating mechanism comprises: a driving block, a pin-type sensor, a stop cover plate, and an actuating rod; the locking module 7 comprises: a locking unit, an actuating rod locking pin, an upper detection rod detection pin, a lower detection rod detection pin, and an extruder; the detection mechanism comprises: an upper detection rod and a lower detection rod; the primary of the linear motor is fixedly connected to the switch machine housing by bolts, and the secondary of the linear motor is connected to the actuating rod through the driving block, the pin-type sensor and the stop cover plate; the two actuating rod locking pins on one side of the locking unit of the locking module are connected to the actuating rod, and the upper detection rod detection pin and the lower detection rod detection pin on the other side are respectively connected to the upper detection rod and the lower detection rod of the detection mechanism, and the top surface of the locking unit is connected to the extruder through an extrusion column, and the extruder is fixed to the housing by bolts.

[0007] The controller receives the switch switching command, and after judging that the current state of the switch machine is normal, the controller feeds back the switch switching indication state. At the same time, the controller controls the variable frequency power supply to supply power to the locking module of the switch machine. The locking unit in the locking module is unlocked and the locking pin, the upper detection rod detection pin and the lower detection rod detection pin are returned to the inside of the locking unit. After the locking unit self-checks and is in place normally, the switch machine is unlocked; the controller sends the voltage and frequency parameter instruction information matching the switch machine to the variable frequency power supply so that it supplies power to the linear motor of the switch machine. The primary of the linear motor is fixed on the housing, and the secondary of the linear motor performs linear motion on the primary guide rail. Its relative displacement information is fed back to the controller in real time through the linear encoder; the secondary of the linear motor contacts the drive block during the unidirectional linear motion, and then is connected to the drive block. The pin-type sensor and the stop cover plate transmit the driving force to the actuating rod, driving the actuating rod to move linearly, and finally driving the switch connected to the actuating rod to switch; the actuating rod and the upper detection rod and the lower detection rod are all equipped with magnetic grids, and the position information is read out by the eddy current sensor and fed back to the controller in real time; when the switch machine is in place, the controller compares the position information of the secondary of the linear motor, the actuating rod, the upper detection rod and the lower detection rod, and after judging that it is in place, the controller controls the variable frequency power supply to power the locking module, and the built-in electric drive module of the locking unit of the locking module extends the locking pin of the actuating rod, the detection pin of the upper detection rod and the detection pin of the lower detection rod, and inserts them into the corresponding holes of the actuating rod, the upper detection rod and the lower detection rod respectively; when the locking unit self-checks and locks successfully, the controller sends an indication information that the switch is in place, and the switch machine completes a single conversion action.

[0008] When the turnout is squeezed out, the locking unit of the locking module will lift the squeeze column and slide along the guide groove of the squeeze device. The controller detects the abnormal movement and sends out an alarm signal.

[0009] Provided is a switch machine method based on linear motor variable frequency drive technology, which at least includes:

[0010] The first step is to initialize the system and set the switch information, such as switch number, travel, power supply voltage and frequency under rated load conditions, etc. After the setting is completed, the switch parameter information is locked;

[0011] In the second step, the station monitoring room issues an instruction to operate the turnout. If the whole machine detection status is normal, the controller feedbacks the conversion execution status and energizes the locking unit of the switch machine. After the locking unit is energized, the locking pin of the action rod and the upper and lower detection pins of the detection rod are unlocked and returned to the locking unit; if the whole machine detection status is abnormal after the station monitoring room issues an instruction to operate the turnout, the controller feedbacks the abnormal information and waits for processing;

[0012] Step 3: During the conversion process, the controller determines whether the switch machine is overloaded or in an abnormal state by comparing the normal output force-time curve of the machine with the real-time output force-time curve;

[0013] Step 4: After the switch machine is in place, the controller determines the state of the switch machine and the external turnout by comparing the strokes of the linear motor, the operating rod, and the detection rod. After all are in place, the controller controls the variable frequency power supply to energize the locking unit to lock the operating rod and the detection rod;

[0014] Step 5: After the locking pin and the detection pin are detected to be in place, the controller will feedback the status information of the switch being switched into place.

[0015] The step 3 comprises:

[0016] (3a) If the switch machine is overloaded, the frequency converter will reduce the output to the critical overload state by changing the frequency converter power supply parameters and issue an overload warning alarm;

[0017] (3b) If the switch machine is not overloaded, the switch machine action conversion instruction will continue to be executed;

[0018] (3c) If the switch machine is in abnormal state, the controller will issue an abnormal state alarm.

[0019] (3d) If the switch machine is in normal switching state, the controller will send a signal to indicate that the switching is normal.

[0020] The present invention has the following advantages:

[0021] 1) The structure is simple, and the linear motor directly outputs linear motion, avoiding the situation in which the rotary motor converts the rotary motion into linear motion, which causes the reduction of efficiency and transmission accuracy;

[0022] 2) The linkage block of the switch machine action rod is connected through a pin-type sensor to monitor the output force during the switch machine operation; when the external turnout is blocked and the output force increases to more than 1.5 times the rated load, the controller controls and stabilizes the output force by adjusting the frequency conversion power supply parameters so that it does not exceed the maximum output load;

[0023] 3) Use the pin-type sensor on the switch machine action rod to monitor the switch machine output force-time curve. Compare the normal output force-time curve of the switch machine to provide fault warning for the switch machine;

[0024] 4) By separating the locking module from the action mechanism, the action rod and the indicating rod of the switch machine can be locked at different travel positions, which enhances the adaptability of the switch machine and reduces the travel model of the switch machine;

[0025] 5) The switch machine operating rod and detection rod are cylindrical waterproof structures to improve the waterproof performance of the entire machine.

[0026] The present invention will be further described below in conjunction with the accompanying drawings of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the switch machine of the present invention;

[0028] Figure 2 It is a schematic diagram of the relationship between the linear motor and the action mechanism of the present invention;

[0029] Figure 3 This is a schematic diagram of a locking module of the present invention;

[0030] Figure 4 It is a schematic diagram of the detection mechanism of the present invention;

[0031] Figure 5 It is a schematic diagram of the relationship between the switch machine system of the present invention;

[0032] Figure 6 It is a schematic diagram of the working process of the present invention.

[0033] In the figure, 1. controller; 2. variable frequency power supply; 3. switch machine; 4. housing; 5. linear motor; 51. primary of linear motor; 52. secondary of linear motor; 6. actuating mechanism; 61. driving block; 62. pin sensor; 63. stop cover; 64. actuating rod; 7. locking module; 71. locking unit; 72. actuating rod locking pin; 73. upper detection rod detection pin; 74. lower detection rod detection pin; 75. extruder; 8. detection mechanism; 81. upper detection rod; 82. lower detection rod; 9. electrical control interface; 10. displacement sensor. DETAILED DESCRIPTION

[0034] like Figure 1As shown, it relates to a switch machine based on linear motor variable frequency drive technology, which at least includes: a shell 4, a linear motor 5, an action mechanism 6, a locking module 7, a detection mechanism 8, an electrical control interface 9, and a displacement sensor 10. The linear motor 5 is supported and installed at both ends in the shell 4, and the installation axis of the linear motor 5 is fixed at both ends of the shell 4; the action mechanism 6, the detection mechanism 8, and the displacement sensor 10 are fixed on one side of the installation axis of the linear motor 5 in the shell 4, and an electrical control interface 9 is provided on the shell 4. The external variable frequency power line is connected to the switch machine linear motor 5 through the electrical control interface 9; after the switch machine 3 is switched to the right position, the controller 1 judges the status of the switch machine 3 and the external turnout by the stroke of the linear motor 5, the action mechanism 6, the detection mechanism 8, and the displacement sensor 10 in the shell 4 through the electrical control interface 9. After all are in place, the controller 1 controls the variable frequency power supply 2 to energize the locking unit 71 to lock the action rod 64 and the detection rod.

[0035] like Figure 2 , Figure 3 , Figure 4 As shown, the linear motor 5 includes: a primary 51 of the linear motor, a secondary 52 of the linear motor; the action mechanism 6 includes: a driving block 61, a pin sensor 62, a stop cover 63, and an action rod 64; the locking module 7 includes: a locking unit 71, an action rod locking pin 72, an upper detection rod detection pin 73, a lower detection rod detection pin 74, and an extruder 75; the detection mechanism 8 includes: an upper detection rod 81, a lower detection rod 82; the primary 51 of the linear motor and the switch housing 4 are connected by The linear motor secondary 52 is connected with the actuating rod 64 through the driving block 61, the pin sensor 62 and the stop cover plate 63 by bolts. The two actuating rod locking pins 72 on one side of the locking unit 71 of the locking module 7 are connected with the actuating rod 64, and the upper detection rod detection pin 73 and the lower detection rod detection pin 74 on the other side are respectively connected with the upper detection rod 81 and the lower detection rod 82 of the detection mechanism 8. The top surface of the locking unit 71 is connected with the extruder 75 through an extrusion column, and the extruder 75 is fixed to the housing 4 by bolts.

[0036] Reference Figure 1~Figure 5, relates to a working principle of a switch machine based on linear motor variable frequency drive technology: when the controller 1 receives a switch switching command, the controller 1 determines that the current state of the switch machine 3 is normal and then feeds back the switch switching indication state, and at the same time the controller 1 controls the variable frequency power supply 2 to supply power to the locking module 7 of the switch machine 3, the locking unit 71 in the locking module 7 is unlocked and the locking pin 72, the upper detection rod detection pin 73 and the lower detection rod detection pin 74 are returned to the inside of the locking unit 71, and the locking unit 71 completes the unlocking of the switch machine 3 after self-checking and being in place; the controller 1 sends the voltage and frequency parameter instruction information matching the switch machine 3 to the variable frequency power supply 2 so that it supplies power to the linear motor 5 of the switch machine 3, the primary 51 of the linear motor is fixed on the housing 4, and the secondary 52 of the linear motor performs linear motion on the guide rail of the primary 51 of the linear motor, and its relative displacement information is fed back to the controller 1 in real time through the linear encoder; the secondary 52 of the linear motor contacts the driving block 61 during the unidirectional linear motion, and then passes The driving force is transmitted to the actuating rod 64 through the pin sensor 62 and the stop cover plate 63 connected to the driving block 61, driving the actuating rod 64 to move linearly, and finally driving the switch connected to the actuating rod 64 to switch; the actuating rod 64 and the upper detection rod 81 and the lower detection rod 82 are all equipped with magnetic grids, and the position information is read out by the eddy current sensor 9 and fed back to the controller 1 in real time; when the switch machine 3 moves to the right position, the controller 1 compares the position information of the secondary 52 of the linear motor, the actuating rod 64, the upper detection rod 81 and the lower detection rod 82, and after judging that it is in place, the controller 1 controls the variable frequency power supply 2 to power the locking module 7, and the built-in electric drive module of the locking unit 71 of the locking module 7 extends the actuating rod locking pin 72, the upper detection rod detection pin 73 and the lower detection rod detection pin 74, and inserts them into the corresponding holes of the actuating rod 64, the upper detection rod 81 and the lower detection rod 82 respectively; when the locking unit 71 self-checks and locks successfully, the controller 1 sends an indication information that the switch is switched to the right position, and the switch machine 3 completes a single switching action.

[0037] When the switch extrusion phenomenon occurs, the locking unit 71 of the locking module 7 lifts the extrusion column and slides along the guide groove of the extruder 75. The controller 1 detects the abnormal movement and sends out an alarm signal.

[0038] Reference Figure 6 , relates to a switch machine method based on linear motor variable frequency drive technology: at least including:

[0039] The first step is to initialize the system and set the information of the turnout machine 3, such as the number, travel, power supply voltage and frequency under rated load conditions of the turnout machine 3. After the setting is completed, the parameter information of the turnout machine 3 is locked;

[0040] In the second step, the station monitoring room issues an instruction to operate the turnout. If the whole machine detection status is normal, the controller 1 feedbacks the conversion execution status and energizes the locking unit 71 of the switch machine 3. After the locking unit 71 is energized, the action rod locking pin 72 and the upper and lower detection rod detection pins are unlocked and returned to the locking unit 71; if the whole machine detection status is abnormal after the station monitoring room issues an instruction to operate the turnout, the controller 1 feedbacks the abnormal information and waits for processing;

[0041] Step 3: During the conversion process, the controller 1 determines whether the switch machine 3 is overloaded or in an abnormal state by comparing the normal output force-time curve of the machine with the real-time output force-time curve;

[0042] Step 4: After the switch machine 3 is switched to the right position, the controller 1 determines the status of the switch machine 3 and the external turnout by comparing the strokes of the linear motor 5, the actuating rod 64 and the detection rod. After all are in place, the controller 1 controls the variable frequency power supply 2 to energize the locking unit 71 to lock the actuating rod 64 and the detection rod.

[0043] Step 5: After the locking pin and the detection pin are both detected to be in place, the controller 1 feeds back the status information of the switch being switched into place.

[0044] The step 3 comprises:

[0045] (3a) If the switch machine 3 is overloaded, the frequency conversion controller will reduce the output to the overload critical state by changing the parameters of the frequency conversion power supply 2 and issue an overload warning alarm;

[0046] (3b) If the switch machine 3 is not overloaded, the switch machine 3 action conversion instruction will continue to be executed;

[0047] (3c) If the switching state of the switch machine 3 is abnormal, the controller 1 issues a switching abnormality prompt alarm;

[0048] (3d) If the switching state of the switch machine 3 is normal, the controller 1 sends a signal to indicate that the switching is normal.

[0049] The embodiments of the present invention are described in detail above. The above embodiments are only the best solutions of the present invention, but the present invention is not limited to the above embodiments. All switch machines based on linear motor variable frequency drive technology are within the protection scope of the present invention.

Claims

1. A switch machine based on linear motor variable frequency drive technology, characterized in that: at least include: A housing (4), a linear motor (5), an action mechanism (6), a locking module (7), a detection mechanism (8), an electrical control interface (9), and a displacement sensor (10); the linear motor (5) is on a linear motor (5) mounting shaft in the housing (4); the linear motor (5) mounting shaft is fixed at both ends of the housing (4); the action mechanism (6), the detection mechanism (8), and the displacement sensor (10) are fixed on one side of the linear motor (5) mounting shaft in the housing (4); an electrical control interface (9) is provided on the housing (4); an external variable frequency power supply line is connected to the switch machine linear motor (5) through the electrical control interface (9); after the switch machine (3) is switched to a certain position, the controller (1) determines the status of the switch machine (3) and the external turnout by measuring the travel of the linear motor (5), the action mechanism (6), the detection mechanism (8), and the displacement sensor (10) in the housing (4) through the electrical control interface (9); after all are in place, the controller (1) controls the variable frequency power supply (2) to energize the locking unit (71) to lock the action rod (64) and the detection rod; The linear motor (5) comprises: a primary of the linear motor (51) and a secondary of the linear motor (52); the actuating mechanism (6) comprises: a driving block (61), a pin-type sensor (62), a stop cover plate (63), and an actuating rod (64); the locking module (7) comprises: a locking unit (71), an actuating rod locking pin (72), an upper detection rod detection pin (73), a lower detection rod detection pin (74), and an extruder (75); the detection mechanism (8) comprises: an upper detection rod (81) and a lower detection rod (82); the primary of the linear motor (51) and the switch housing (4) are connected by a The linear motor secondary (52) is connected to the actuating rod (64) via a drive block (61), a pin-type sensor (62) and a stop cover plate (63); two actuating rod locking pins (72) on one side of a locking unit (71) of the locking module (7) are connected to the actuating rod (64); an upper detection rod detection pin (73) and a lower detection rod detection pin (74) on the other side are respectively connected to an upper detection rod (81) and a lower detection rod (82) of a detection mechanism (8); a top surface of the locking unit (71) is connected to an extruder (75) via an extrusion column; and the extruder (75) is fixed to the housing (4) via bolts.

2. The switch machine based on linear motor variable frequency drive technology according to claim 1 is characterized in that: The controller (1) receives a turnout switching command, and the controller (1) feeds back a turnout switching indication status. At the same time, the controller (1) controls the variable frequency power supply (2) to supply power to the locking module (7) of the switch machine (3). The locking unit (71) in the locking module (7) is unlocked and the locking pin (72), the upper detection rod detection pin (73) and the lower detection rod detection pin (74) are returned to the inside of the locking unit (71). After the locking unit (71) self-checks and is in place normally, the unlocking of the switch machine (3) is completed. The controller (1) is connected to the switch machine (3). The matched voltage and frequency parameter instruction information is sent to the variable frequency power supply (2) so that it supplies power to the linear motor (5) of the switch machine (3). The primary (51) of the linear motor is fixed on the housing (4). The secondary (52) of the linear motor performs linear motion on the guide rail of the primary (51) of the linear motor. The relative displacement information is fed back to the controller (1) in real time through the linear encoder. During the unidirectional linear motion, the secondary (52) of the linear motor contacts the driving block (61), and then the pin-type sensor (62) connected to the driving block (61) and the stopper are used to generate the relative displacement information. The baffle plate (63) transmits the driving force to the actuating rod (64), driving the actuating rod (64) to move linearly, and finally driving the switch connected to the actuating rod (64) to switch; the actuating rod (64) and the upper detection rod (81) and the lower detection rod (82) are all equipped with magnetic grids, and the position information is read out by the eddy current sensor and fed back to the controller (1) in real time; when the switch machine (3) moves to the right position, the controller (1) compares the position information of the secondary (52) of the linear motor, the actuating rod (64), the upper detection rod (81) and the lower detection rod (82), After determining that the switch is in place, the controller (1) controls the variable frequency power supply (2) to supply power to the locking module (7), and the built-in electric drive module of the locking unit (71) of the locking module (7) extends the action rod locking pin (72), the upper detection rod detection pin (73), and the lower detection rod detection pin (74), and inserts them into the corresponding holes of the action rod (64), the upper detection rod (81), and the lower detection rod (82) respectively; when the locking unit (71) is locked successfully after self-checking, the controller (1) sends an indication message that the switch is in place, and the switch machine (3) completes a single switching action.

3. The switch machine based on linear motor variable frequency drive technology according to claim 2 is characterized in that: When a turnout extrusion phenomenon occurs, the locking unit (71) of the locking module (7) lifts the extrusion column and slides along the guide groove of the extruder (75), and the controller (1) detects the abnormal movement and sends out an alarm signal.

4. A method for using a switch machine based on linear motor variable frequency drive technology as claimed in claim 1, characterized in that: At least: The first step is to initialize the system, set the number, travel range, power supply voltage and frequency under rated load conditions of the turnout machine (3), and lock the parameter information of the turnout machine (3) after the settings are completed; In the second step, the station monitoring room issues an instruction to operate the turnout. If the detection status of the whole machine is normal, the controller (1) feeds back the conversion execution status and energizes the locking unit (71) of the switch machine (3). After the locking unit (71) is energized, the action rod locking pin (72) and the upper and lower detection rod detection pins are unlocked and returned to the locking unit (71). If the detection status of the whole machine is abnormal after the station monitoring room issues an instruction to operate the turnout, the controller (1) feeds back abnormal information and waits for processing. Step 3: During the switching process, the controller (1) determines whether the switch machine (3) is overloaded by comparing the normal output force-time curve of the machine with the real-time output force-time curve; In the fourth step, after the switch machine (3) is switched to the right position, the controller (1) determines the state of the switch machine (3) and the external turnout by comparing the strokes of the linear motor (5), the actuating rod (64), and the detection rod. After all are in place, the controller (1) controls the variable frequency power supply (2) to energize the locking unit (71) to lock the actuating rod (64) and the detection rod; Step 5: After the locking pin and the detection pin are both detected to be in place, the controller (1) feeds back the status information of the turnout being in place.

5. A switch machine method based on linear motor variable frequency drive technology according to claim 4, characterized in that: The step 3 comprises: (3a) If the switch machine (3) is overloaded, the frequency conversion controller reduces the output to the overload critical state by changing the parameters of the frequency conversion power supply (2) and issues an overload warning alarm; (3b) If the switch machine (3) is not overloaded, the action conversion instruction of the switch machine (3) will continue to be executed; (3c) If the switching state of the switch machine (3) is abnormal, the controller (1) issues a switching abnormality prompt alarm; (3d) If the switch machine (3) is in a normal switching state, the controller (1) sends a signal indicating that the switching is normal.

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