Electric control system of gear rack elevator and motor control method

Abstract

The invention provides an electric control system of a gear rack elevator and a motor control method. The electric control system comprises an upper seam detector, a lower seam detector and a controller. The upper seam detector and the lower seam detector are both arranged on the outer side wall, close to the rack crawling ladder, of the lift car of the lift, the upper seam detector is arranged above the upper gear, and the lower seam detector is arranged below the lower gear; the upper seam detector is used for performing seam detection on a rack in front of an upper gear in the ascending process of the elevator, and the lower seam detector is used for performing seam detection on a rack in front of a lower gear in the descending process of the elevator; the controller is used for controlling operation of the driving motors according to detection signals of the upper seam detector or the lower seam detector in the operation process of the elevator, and the driving motors comprise the driving motor of the upper gear and the driving motor of the lower gear. According to the technical scheme, the problem that the gear of the elevator is stuck or stagnated when passing through the rack joint can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and in particular to an electric control system and a motor control method of a rack and pinion elevator. Background Art

[0002] Rack and pinion lifts (hereinafter referred to as lifts) are special equipment for vertical lifts that are widely used in wind power fields such as wind turbine towers and wind turbines. They are convenient, fast, safe, reliable, intelligent and efficient. With their applications in various industrial fields, they also have non-standard technical requirements to adapt to various operating conditions.

[0003] Since the structure of the wind turbine tower is installed in sections, the problem that follows is that when the two sections of the tower are connected, especially when the towers of different wind turbines are mixed, joints will appear in the connection of the elevator rack ladder. When the elevator gear passes through the rack joint, it will cause operation jams when encountering small joints, and the gear will cause jamming when encountering large joints, which seriously affects the on-site installation efficiency and equipment use. Summary of the invention

[0004] The invention provides an electric control system and a motor control method for a gear rack elevator, which are used to solve the problem of the elevator gear getting stuck or stuck when passing through the rack joint.

[0005] In a first aspect, the present invention provides an electric control system for a rack and pinion elevator, comprising: An upper seam detector, a lower seam detector and a controller; The upper joint detector and the lower joint detector are both arranged on the outer side wall of the elevator car close to the rack ladder, and the upper joint detector is arranged above the upper gear, and the lower joint detector is arranged below the lower gear; The upper joint detector is used to detect the joint of the rack in front of the upper gear during the upward movement of the elevator, and the lower joint detector is used to detect the joint of the rack in front of the lower gear during the downward movement of the elevator; The controller is used to control the operation of the drive motor according to the detection signal of the upper seam detector or the lower seam detector during the operation of the elevator, and the drive motor includes the drive motor of the upper gear and the drive motor of the lower gear.

[0006] In some embodiments, the controller includes a power control module for: If it is determined that there is a rack joint ahead according to the detection signal of the upper joint detector or the lower joint detector during the operation of the lift, the power supply of the drive motor of the gear is disconnected before the gear reaches the rack joint; The gears include the upper gear and the lower gear.

[0007] In some embodiments, the power control module includes a first control unit configured to: For the first running direction, when it is determined according to the detection signal of the first joint detector that the first edge of the rack joint is detected, the power supply of the first driving motor is disconnected; Wherein, in the case where the first running direction is the downward direction of the elevator, the first joint detector is the lower joint detector, the first edge is the upper edge of the joint, and the first drive motor is the drive motor of the lower gear; When the first running direction is the upward direction of the elevator, the first seam detector is the upper seam detector, the first edge is the lower seam edge, and the first drive motor is the drive motor of the upper gear.

[0008] In some embodiments, the first control unit is further configured to: After determining that the second edge of the rack joint is detected according to the detection signal of the first joint detector, restoring the power supply of the first driving motor after a time period t1; When the first running direction is the downward direction of the elevator, the second edge is the lower edge of the joint; when the first running direction is the upward direction of the elevator, the second edge is the upper edge of the joint; The duration t1 is equal to D / V, where D represents the vertical distance between the first seam detector and the gear core corresponding to the first driving motor, and V represents the rated operating speed of the elevator.

[0009] In some embodiments, the power control module further includes a second control unit configured to: After the power supply of the first driving motor is disconnected, the power supply of the second driving motor is disconnected after a time period t2, where the second driving motor is another driving motor different from the first driving motor; The time length t2 is equal to L / V, where L represents the wheel core distance between the upper gear and the lower gear.

[0010] In some embodiments, the second control unit is further configured to: After the power supply to the first driving motor is restored, the power supply to the second driving motor is restored after the time period t2.

[0011] In some embodiments, the upper seam detector and the lower seam detector are both photoelectric switches.

[0012] In a second aspect, the present invention further provides a motor control method executed by the electric control system of the rack and pinion elevator according to the first aspect, the method comprising: The controller obtains a detection signal of the upper seam detector or the lower seam detector during the operation of the elevator; The controller controls the operation of the driving motor according to the detection signal.

[0013] In some embodiments, controlling the operation of the gear drive motor according to the detection signal includes: If it is determined according to the detection signal that there is a rack joint ahead, the power supply of the driving motor of the gear is disconnected before the gear reaches the rack joint; The gears include the upper gear and the lower gear.

[0014] In some embodiments, before the gear reaches the rack joint, disconnecting the power supply of the driving motor of the gear comprises: For the first running direction, when it is determined according to the detection signal of the first joint detector that the first edge of the rack joint is detected, the power supply of the first driving motor is disconnected; Wherein, in the case where the first running direction is the downward direction of the elevator, the first joint detector is the lower joint detector, the first edge is the upper edge of the joint, and the first drive motor is the drive motor of the lower gear; When the first running direction is the upward direction of the elevator, the first seam detector is the upper seam detector, the first edge is the lower seam edge, and the first drive motor is the drive motor of the upper gear.

[0015] In some embodiments, the method further comprises: After the controller determines that the second edge of the rack joint is detected according to the detection signal of the first joint detector, the controller restores the power supply of the first driving motor after a time period t1; When the first running direction is the downward direction of the elevator, the second edge is the lower edge of the joint; when the first running direction is the upward direction of the elevator, the second edge is the upper edge of the joint; The duration t1 is equal to D / V, where D represents the vertical distance between the first seam detector and the gear core corresponding to the first driving motor, and V represents the rated operating speed of the elevator.

[0016] In some embodiments, before the gear reaches the rack joint, disconnecting the power supply of the drive motor of the gear further comprises: After the power supply of the first driving motor is disconnected, the power supply of the second driving motor is disconnected after a time period t2, where the second driving motor is another driving motor different from the first driving motor; The time length t2 is equal to L / V, where L represents the wheel core distance between the upper gear and the lower gear.

[0017] In some embodiments, the method further comprises: After the power supply to the first driving motor is restored, the power supply to the second driving motor is restored after the time period t2.

[0018] The electric control system and motor control method of the rack and pinion elevator provided by the present invention detect the rack joint by setting two joint detectors, wherein the upper joint detector is set above the upper gear, and is used to detect the joint of the rack in front of the upper gear during the upward process of the elevator, and the lower joint detector is set below the lower gear, and is used to detect the joint of the rack in front of the lower gear during the downward process of the elevator, so that the controller can determine in real time whether there is a rack joint in front of the elevator according to the detection signal of the upper joint detector or the lower joint detector, and control the operation of the drive motor accordingly, so that the upper and lower gears can pass through the rack joint more smoothly, thereby solving the problem of the elevator gear being stuck or stuck when passing through the rack joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of rack joints provided by related technology.

[0021] Figure 2 It is a schematic diagram of the electric control system of the rack and pinion elevator provided by the present invention.

[0022] Figure 3 It is a main circuit schematic diagram of the controller provided by the present invention.

[0023] Figure 4 The figure is a control circuit schematic diagram of the controller provided by the present invention.

[0024] Figure 5 It is a schematic diagram of the relative positions of the joint detector, gear and rack joint provided by the present invention.

[0025] Figure 6It is a flow chart of the motor control method provided by the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the present invention, the term "plurality" refers to two or more than two, and other quantifiers are similar to them.

[0029] In the present invention, the terms "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0030] Combine the following Figure 1-Figure 6 Embodiments of the present invention are described.

[0031] Figure 1 This is a schematic diagram of the rack joint provided by the relevant technology. Figure 1 The position indicated by the middle arrow is the rack joint. The rack joint in the present invention can be a large joint or a small joint, and is not limited. In the related art, the rack and pinion elevator is configured with dual drive motors, and two gears act on the same rack. When there is a gap between the racks (i.e., the rack joint), the gear will become stuck and stuck.

[0032] The present invention aims to control the dual drive motors through an electric control system so that the output gears of the two drive motors can avoid jamming and stagnation when passing through the rack joint successively and pass through the rack joint smoothly.

[0033] Figure 2 Schematic diagram of the electric control system of the rack and pinion elevator provided by the present invention, such as Figure 2 As shown, the electric control system includes an upper seam detector, a lower seam detector and a controller.

[0034] Among them, the upper seam detector and the lower seam detector are both arranged on the outer side wall of the elevator car close to the rack ladder, and the upper seam detector is arranged above the upper gear, and the lower seam detector is arranged below the lower gear.

[0035] The upper joint detector is used to detect the joint of the rack in front of the upper gear during the upward process of the elevator, and the lower joint detector is used to detect the joint of the rack in front of the lower gear during the downward process of the elevator.

[0036] The controller is used to control the operation of the drive motor according to the detection signal of the upper seam detector or the lower seam detector during the operation of the elevator. The drive motor includes a drive motor for the upper gear and a drive motor for the lower gear.

[0037] It should be noted that the up and down directions mentioned in the present invention are all described based on the natural up and down directions during normal installation or operation of the elevator, and will not be repeated later.

[0038] The present invention sets two joint detectors to detect the rack joint, wherein the upper joint detector is set above the upper gear so that during the upward process of the elevator, the rack joint can be detected in advance before the upper gear reaches the rack joint. Similarly, the lower joint detector is set below the lower gear so that during the downward process of the elevator, the rack joint can be detected in advance before the lower gear reaches the rack joint.

[0039] The upper gear and the lower gear refer to the output gears of the two drive motors respectively. The output gears of the two drive motors act on the racks together, rotate in the same direction at the same time, and output torque to enable the elevator to move up and down.

[0040] In order to facilitate the detection of rack joints, two joint detectors in the present invention are arranged on the outer wall of the elevator car close to the rack ladder, that is, the outer wall of the elevator car is adjacent to the rack ladder. The specific installation position is not limited by the present invention, as long as the detection purpose described above can be achieved, that is: during the upward process of the elevator, the upper joint detector needs to be able to detect the rack joint in advance before the upper gear reaches the rack joint; during the downward process of the elevator, the lower joint detector needs to be able to detect the rack joint in advance before the lower gear reaches the rack joint.

[0041] The present invention does not limit the specific detection devices used by the upper seam detector and the lower seam detector, as long as the above-mentioned detection purpose can be achieved.

[0042] In some embodiments, the upper seam detector and the lower seam detector may both be photoelectric switches.

[0043] Photoelectric switch, also known as photoelectric sensor or photoelectric proximity switch, is an electronic switch device that detects the presence of an object by connecting the circuit through a synchronous loop based on the principle that the object blocks or reflects the light beam. Since the reflection of the light beam by the rack joint is different from that of the normal rack, the rack joint can be detected by a photoelectric switch.

[0044] Photoelectric switches have the characteristics of high precision, high reliability, fast response speed, long detection distance, and strong anti-interference ability, which helps to quickly and accurately detect the position of the rack joint.

[0045] During the operation of the elevator, the controller can obtain the detection signal of the upper seam detector or the lower seam detector in real time, determine whether there is a rack seam in front according to the detection signal, and control the operation of the drive motor accordingly, so that the upper and lower gears can pass through the rack seam more smoothly.

[0046] The electric control system of the rack and pinion elevator provided by the present invention detects the rack joint by arranging two joint detectors, wherein the upper joint detector is arranged above the upper gear, and is used to detect the joint of the rack in front of the upper gear during the upward process of the elevator, and the lower joint detector is arranged below the lower gear, and is used to detect the joint of the rack in front of the lower gear during the downward process of the elevator, so that the controller can determine in real time whether there is a rack joint in front of the elevator according to the detection signal of the upper joint detector or the lower joint detector, and control the operation of the drive motor accordingly, so that the upper and lower gears can pass through the rack joint more smoothly, thereby solving the problem of the elevator gear being stuck or stuck when passing through the rack joint.

[0047] In some embodiments, the controller includes a power control module for: If it is determined that there is a rack joint ahead according to the detection signal of the upper joint detector or the lower joint detector during the operation of the lift, the power supply of the drive motor of the gear is disconnected before the gear reaches the rack joint; The gears include an upper gear and a lower gear.

[0048] For example, during the upward process of the elevator, if it is determined that there is a rack joint ahead according to the detection signal of the upper joint detector, the power supply of the drive motor of the upper gear can be disconnected before the upper gear reaches the rack joint, and the power supply of the drive motor of the lower gear can be normal (to ensure the continuous operation of the elevator); before the lower gear reaches the rack joint, the power supply of the drive motor of the lower gear can be disconnected, and the power supply of the drive motor of the upper gear can be normal.

[0049] For another example, during the downward movement of the elevator, if it is determined that there is a rack joint ahead based on the detection signal of the lower joint detector, the power supply of the drive motor of the lower gear can be disconnected before the lower gear reaches the rack joint, and the power supply of the drive motor of the upper gear can be normal; before the upper gear reaches the rack joint, the power supply of the drive motor of the upper gear can be disconnected, and the power supply of the drive motor of the lower gear can be normal.

[0050] After disconnecting the power supply of the drive motor, the corresponding motor output gear is in a free state, which is conducive to the gear passing through the joint smoothly, reducing mechanical shock and jamming, and fundamentally solving the problem caused by the joints of the rack ladder when the tower is docked. It not only makes tower installation more convenient, but also makes it easier to mix tower sections of different wind turbines.

[0051] Figure 3 It is the main circuit schematic diagram of the controller provided by the present invention, such as Figure 3 As shown, the three-phase AC power supply (AC380V) is connected to the inverter through the power switch, and the inverter is connected to two motors, namely the upper motor (KM1 represents the contactor corresponding to the upper motor) and the lower motor (KM2 represents the contactor corresponding to the lower motor). These two motors are the driving motors of the upper gear and the lower gear. The meaning of each circuit symbol in the figure can be found in the existing technical information and will not be repeated here.

[0052] Figure 4 is a control circuit schematic diagram of the controller provided by the present invention, such as Figure 4 As shown, the PLC in the figure refers to a programmable logic controller (PLC), which is also the controller in the present invention. It can be seen that an upper seam detection photoelectric switch and a lower seam detection photoelectric switch are added to the PLC, indicating that the PLC can control the operation of the drive motor (i.e., output motor 1 and output motor 2 in the figure) according to the detection signal of the upper seam detection photoelectric switch or the lower seam detection photoelectric switch during the operation of the elevator. The meaning of each circuit symbol in the figure can be referred to the existing technical information, and will not be repeated here.

[0053] In some embodiments, the power control module includes a first control unit configured to: For the first running direction, when it is determined that the first edge of the rack joint is detected according to the detection signal of the first joint detector, the power supply of the first driving motor is disconnected; Wherein, when the first running direction is the downward direction of the elevator, the first joint detector is a lower joint detector, the first edge is an upper edge of the joint, and the first drive motor is a drive motor of the lower gear; When the first running direction is the upward direction of the elevator, the first seam detector is an upper seam detector, the first edge is a lower seam edge, and the first drive motor is a drive motor of an upper gear.

[0054] Figure 5 It is a schematic diagram of the relative positions of the joint detector, gear and rack provided by the present invention. Figure 5 In the figure, L represents the wheel core distance between the upper gear and the lower gear, D1 represents the vertical distance between the lower seam detector and the lower gear wheel core, D2 represents the vertical distance between the upper seam detector and the upper gear wheel core, and S represents the length of the rack seam (i.e., the vertical distance between the upper edge of the seam and the lower edge of the seam). Taking the seam detector as a photoelectric switch as an example, the light beam emitted by the photoelectric switch is in the horizontal direction, and the vertical distance between the lower seam detector and the lower gear wheel core is the vertical distance from the lower gear wheel core to the light beam emitted by the lower seam detector, and the vertical distance between the upper seam detector and the upper gear wheel core is the vertical distance from the upper gear wheel core to the light beam emitted by the upper seam detector.

[0055] Taking the elevator going down as an example, when the lower joint detector detects the upper edge of the joint, the controller immediately disconnects the power supply of the drive motor of the lower gear, such as disconnecting the contactor KM2, to ensure that the lower gear is in a free state before reaching the rack joint, so as to pass through the rack joint smoothly. It should be noted that at this time, the brake of the drive motor of the lower gear is still in the open state to ensure the continuous operation of the elevator.

[0056] In some embodiments, the first control unit is further configured to: After the second edge of the rack joint is detected according to the detection signal of the first joint detector, the power supply of the first driving motor is restored after a time period t1; When the first running direction is the downward direction of the elevator, the second edge is the lower edge of the joint; when the first running direction is the upward direction of the elevator, the second edge is the upper edge of the joint; The duration t1 is equal to D / V, where D represents the vertical distance between the first seam detector and the gear core corresponding to the first drive motor, and V represents the rated operating speed of the elevator.

[0057] Still taking the downward movement of the elevator as an example, after the power supply of the driving motor of the lower gear is disconnected, the elevator still runs downward at the rated operating speed V. Since the driving motor of the lower gear suddenly loses power, it will initially continue to passively run at the rated operating speed V following the rack for a distance (D1). Then, after passing the upper edge of the rack joint, due to the reaction force of the reducer, the lower gear will immediately stop rotating until it contacts the lower edge of the rack joint. At this time, the lower gear has passed the rack joint, and the power supply of the driving motor of the lower gear can be restored, for example, the power supply of contactor KM2 can be restored, so that the driving motor of the lower gear can regain power, that is, the dual motor drive is restored to reduce the load of the other driving motor.

[0058] Regarding the power supply recovery time of the driving motor of the lower gear, the controller may start timing when it determines that the lower edge of the rack joint is detected, and recover the driving motor of the lower gear after a time t1, where t1=D1 / V.

[0059] In some embodiments, the power control module further includes a second control unit configured to: After the power supply of the first drive motor is disconnected, the power supply of the second drive motor is disconnected after a time period t2, where the second drive motor is another drive motor different from the first drive motor; The duration t2 is equal to L / V, where L represents the wheel core distance between the upper gear and the lower gear.

[0060] Still taking the downward movement of the elevator as an example, after the lower gear passes through the rack joint, the upper gear can then adopt the same joint passing method as the lower gear, that is, before the upper gear reaches the rack joint, disconnect the power supply of the upper gear's drive motor to ensure that the upper gear is in a free state before reaching the rack joint, thereby smoothly passing through the rack joint.

[0061] The power supply disconnection time of the driving motor of the upper gear may be delayed by the power supply disconnection time of the driving motor of the lower gear by the time length t2, where t2=L / V. For example, the controller may start a timer when disconnecting the power supply of the driving motor of the upper gear, and the power supply of the driving motor of the upper gear may be disconnected when the timer passes the time length t2.

[0062] It should be noted that if the operator manually stops the operation of the elevator after the lower gear passes through the rack joint and the upper gear has not reached the rack joint, in this case the controller needs to exclude the duration of the elevator shutdown period based on the operating status of the elevator, that is, the duration of the elevator shutdown period is not included in the duration t2.

[0063] In some embodiments, the second control unit is further configured to: After the power supply to the first driving motor is restored, the power supply to the second driving motor is restored after a period of time t2.

[0064] Still taking the downward movement of the elevator as an example, after disconnecting the power supply of the drive motor of the upper gear, the elevator still runs downward at the rated operating speed V. Due to the reaction force of the reducer, the upper gear will stop rotating immediately after reaching the upper edge of the rack joint until it contacts the lower edge of the rack joint. At this time, the upper gear has passed the rack joint, and the power supply of the drive motor of the upper gear can be restored, for example, the power supply of contactor KM1 can be restored, so that the drive motor of the upper gear can regain power, that is, the dual motor drive is restored to reduce the load of the other drive motor.

[0065] The power supply recovery time of the upper gear drive motor may be a delay of the power supply recovery time of the lower gear drive motor by a time length t2, where t2=L / V. For example, the controller may start a timer when restoring the power supply of the upper gear drive motor, and the power supply of the upper gear drive motor may be restored when the timer passes the time length t2.

[0066] The motor control method provided by the present invention is described below. The motor control method described below and the electric control system embodiment described above can be referenced to each other.

[0067] Figure 6 is a flow chart of a motor control method provided by the present invention, which is executed based on the electric control system described above. Figure 6 As shown, the method includes the following steps 601 and 602.

[0068] Step 601: The controller obtains a detection signal of an upper seam detector or a lower seam detector during the operation of the elevator.

[0069] Step 602: The controller controls the operation of the drive motor according to the detection signal.

[0070] In some embodiments, according to the detection signal, controlling the operation of the gear drive motor includes: If it is determined according to the detection signal that there is a rack joint ahead, the power supply of the driving motor of the gear is disconnected before the gear reaches the rack joint; The gears include an upper gear and a lower gear.

[0071] In some embodiments, before the gear reaches the rack joint, disconnecting the power supply of the drive motor of the gear comprises: For the first running direction, when it is determined that the first edge of the rack joint is detected according to the detection signal of the first joint detector, the power supply of the first driving motor is disconnected; Wherein, when the first running direction is the downward direction of the elevator, the first joint detector is a lower joint detector, the first edge is an upper edge of the joint, and the first drive motor is a drive motor of the lower gear; When the first running direction is the upward direction of the elevator, the first seam detector is an upper seam detector, the first edge is a lower seam edge, and the first drive motor is a drive motor of an upper gear.

[0072] In some embodiments, the method further comprises: After the controller determines that the second edge of the rack joint is detected according to the detection signal of the first joint detector, the power supply of the first driving motor is restored after a time period t1; When the first running direction is the downward direction of the elevator, the second edge is the lower edge of the joint; when the first running direction is the upward direction of the elevator, the second edge is the upper edge of the joint; The duration t1 is equal to D / V, where D represents the vertical distance between the first seam detector and the gear core corresponding to the first drive motor, and V represents the rated operating speed of the elevator.

[0073] In some embodiments, before the gear reaches the rack joint, disconnecting the power supply of the drive motor of the gear, further comprising: After the power supply of the first drive motor is disconnected, the power supply of the second drive motor is disconnected after a time period t2, where the second drive motor is another drive motor different from the first drive motor; The duration t2 is equal to L / V, where L represents the wheel core distance between the upper gear and the lower gear.

[0074] In some embodiments, the method further comprises: After the power supply to the first driving motor is restored, the power supply to the second driving motor is restored after a period of time t2.

[0075] It should be noted here that the above-mentioned motor control method provided by the present invention can implement all the method steps implemented by the above-mentioned electric control system embodiment, and can achieve the same technical effects. The parts and beneficial effects of this embodiment that are the same as the above-mentioned electric control system embodiment will not be described in detail here.

[0076] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0077] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric control system for a rack and pinion elevator, characterized in that: include: An upper seam detector, a lower seam detector and a controller; The upper joint detector and the lower joint detector are both arranged on the outer side wall of the elevator car close to the rack ladder, and the upper joint detector is arranged above the upper gear, and the lower joint detector is arranged below the lower gear; The upper joint detector is used to detect the joint of the rack in front of the upper gear during the upward movement of the elevator, and the lower joint detector is used to detect the joint of the rack in front of the lower gear during the downward movement of the elevator; The controller is used to control the operation of the drive motor according to the detection signal of the upper seam detector or the lower seam detector during the operation of the elevator, and the drive motor includes the drive motor of the upper gear and the drive motor of the lower gear.

2. The electric control system of the rack and pinion elevator according to claim 1, characterized in that: The controller includes a power control module, which is used to: If it is determined that there is a rack joint ahead according to the detection signal of the upper joint detector or the lower joint detector during the operation of the lift, the power supply of the drive motor of the gear is disconnected before the gear reaches the rack joint; The gears include the upper gear and the lower gear.

3. The electric control system of the rack and pinion elevator according to claim 2, characterized in that: The power control module includes a first control unit, which is used to: For the first running direction, when it is determined according to the detection signal of the first joint detector that the first edge of the rack joint is detected, the power supply of the first driving motor is disconnected; Wherein, in the case where the first running direction is the downward direction of the elevator, the first joint detector is the lower joint detector, the first edge is the upper edge of the joint, and the first drive motor is the drive motor of the lower gear; When the first running direction is the upward direction of the elevator, the first seam detector is the upper seam detector, the first edge is the lower seam edge, and the first drive motor is the drive motor of the upper gear.

4. The electric control system of the rack and pinion elevator according to claim 3, characterized in that: The first control unit is also used for: After determining that the second edge of the rack joint is detected according to the detection signal of the first joint detector, restoring the power supply of the first driving motor after a time period t1; When the first running direction is the downward direction of the elevator, the second edge is the lower edge of the joint; when the first running direction is the upward direction of the elevator, the second edge is the upper edge of the joint; The duration t1 is equal to D / V, where D represents the vertical distance between the first seam detector and the gear core corresponding to the first driving motor, and V represents the rated operating speed of the elevator.

5. The electric control system of the rack and pinion elevator according to claim 3 or 4, characterized in that: The power control module further includes a second control unit, which is used to: After the power supply of the first driving motor is disconnected, the power supply of the second driving motor is disconnected after a time period t2, where the second driving motor is another driving motor different from the first driving motor; The time length t2 is equal to L / V, where L represents the wheel core distance between the upper gear and the lower gear.

6. The electric control system of the rack and pinion elevator according to claim 5, characterized in that: The second control unit is also used for: After the power supply to the first driving motor is restored, the power supply to the second driving motor is restored after the time period t2.

7. The electric control system of the rack and pinion elevator according to claim 1, characterized in that: The upper seam detector and the lower seam detector are both photoelectric switches.

8. A motor control method executed by an electric control system of a rack and pinion elevator according to any one of claims 1 to 7, characterized in that: The method comprises: The controller obtains a detection signal of the upper seam detector or the lower seam detector during the operation of the elevator; The controller controls the operation of the driving motor according to the detection signal.

9. The motor control method according to claim 8, characterized in that: The step of controlling the operation of the drive motor according to the detection signal comprises: If it is determined according to the detection signal that there is a rack joint ahead, the power supply of the driving motor of the gear is disconnected before the gear reaches the rack joint; The gears include the upper gear and the lower gear.

10. The motor control method according to claim 9, characterized in that: The method of disconnecting the power supply of the driving motor of the gear before the gear reaches the rack joint comprises: For the first running direction, when it is determined according to the detection signal of the first joint detector that the first edge of the rack joint is detected, the power supply of the first driving motor is disconnected; Wherein, in the case where the first running direction is the downward direction of the elevator, the first joint detector is the lower joint detector, the first edge is the upper edge of the joint, and the first drive motor is the drive motor of the lower gear; When the first running direction is the upward direction of the elevator, the first seam detector is the upper seam detector, the first edge is the lower seam edge, and the first drive motor is the drive motor of the upper gear.

11. The motor control method according to claim 10, characterized in that: The method further comprises: After the controller determines that the second edge of the rack joint is detected according to the detection signal of the first joint detector, the controller restores the power supply of the first driving motor after a time period t1; When the first running direction is the downward direction of the elevator, the second edge is the lower edge of the joint; when the first running direction is the upward direction of the elevator, the second edge is the upper edge of the joint; The duration t1 is equal to D / V, where D represents the vertical distance between the first seam detector and the gear core corresponding to the first driving motor, and V represents the rated operating speed of the elevator.

12. The motor control method according to claim 10 or 11, characterized in that: Before the gear reaches the rack joint, disconnecting the power supply of the driving motor of the gear also includes: After the power supply of the first driving motor is disconnected, the power supply of the second driving motor is disconnected after a time period t2, where the second driving motor is another driving motor different from the first driving motor; The time length t2 is equal to L / V, where L represents the wheel core distance between the upper gear and the lower gear.

13. The motor control method according to claim 12, characterized in that: The method further comprises: After the power supply to the first driving motor is restored, the power supply to the second driving motor is restored after the time period t2.

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