Three-layer goods elevator control device

Abstract

The three-layer goods elevator control device comprises a first relay, a second relay, a third relay, a fourth relay and a fifth relay, wherein the first relay, the second relay and the third relay are used for floor selection; the first to fifth control switches respectively control the five relays, the first to third control switches are used as floor selection buttons, and the fourth and fifth control switches are respectively used as a downlink button and an uplink button; and the magnetic control switches are arranged on the three floors. According to the device, only five small relays and other conventional components are used, and various conversion processes, achieved through PLC programming, of the three-layer goods elevator in the past can be completed. And line self-locking, interlocking and automatic switching are realized. And in addition, the trend of the corresponding goods elevator can be locked at any floor and any set place, any problem is avoided, and the goods elevator is convenient to operate, safe and reliable. And electrical components are few, so that batch production of products is facilitated, and wide use of users is facilitated. Even if a fault occurs, a maintainer only needs to replace a corresponding electric appliance element, and previous line troubleshooting is not needed.

Description

Technical Field

[0001] The invention relates to a three-layer freight elevator control device and belongs to the technical field of elevators. Background Art

[0002] Nowadays, elevators have been widely used in all aspects of people's lives and have become an important part of daily production and life. Among them, the use of three-story freight elevators is particularly special and important. Since modern factories mostly adopt a three-story structure, with the first floor as a production workshop and the second and third floors as office areas and warehouses, they often need to be equipped with three-story freight elevators.

[0003] However, most existing three-story freight elevators use PLC devices as control circuits. The disadvantage is that PLC devices are relatively expensive and relatively prone to failure. Once a problem occurs, the entire device needs to be replaced, which further increases the installation and use costs of the freight elevator.

[0004] Therefore, it is necessary to design a control circuit made of simple electrical components to realize the control of the three-layer freight elevator and provide another solution for the existing three-layer freight elevator. Summary of the invention

[0005] The object of the present invention is to provide a three-layer freight elevator control device to overcome the deficiencies of the prior art.

[0006] A three-layer freight elevator control device, characterized by comprising first to third relays (J1, J2, J3) for floor selection, each with a working indicator light, and fourth and fifth relays (CJ1, CJ2) for down and up selection; The first relay J1 has a normally open contact J11, a normally closed contact J12, a normally closed contact J13, and a normally open contact J14; the second relay J2 has a normally open contact J21, a normally closed contact J221 and its associated normally open contact J222, a normally closed contact J231 and its associated normally open contact J232; the third relay J3 has a normally open contact J31, a normally closed contact J32, a normally closed contact J33, and a normally open contact J34; the fourth relay CJ1 has a normally open contact CJ11 and a normally closed contact CJ12; the fifth relay CJ2 has a normally open contact CJ21 and a normally closed contact CJ22; First to fifth control switches (KN1, KN2, KN3, KN4, KN5) for controlling five relays respectively, the control switches are formed by connecting three switches located on the first to third floors in parallel, so that the relays corresponding to the control switches can be controlled on each floor, the first to third control switches (KN1, KN2, KN3) are used as floor selection buttons, and the fourth and fifth control switches (KN4, KN5) are used as down buttons and up buttons respectively; And magnetically controlled switches for the first to third floors, each of which has contacts (K11, K21, K31). When the freight elevator is on one of the floors, the magnetically controlled switch contact corresponding to the floor is disconnected, and the other two are closed.

[0007] 1. When the freight elevator is on the first floor, contact K11 is disconnected, and contacts K21 and K31 are closed. 1.1 When the switch KN2 is pressed to select the second floor, the switch KN2 makes the second relay J2 work, and the normally open contact J21 of the second relay J2 is self-locking and closed, and forms a loop with the normally closed contact J12, the normally closed contact J32, and the magnetic switch contact K21; (In the circuit diagram, because K11 is disconnected, KN1 will not work, and only the second floor and the third floor can be selected); When the switch KN5 is pressed to select the up movement, the switch KN5 makes the fifth relay CJ2 work, and the normally open contact CJ21 of the fifth relay CJ2 is self-locking and closed, and forms a loop with the normally closed contact CJ12, (upper limit switch K5), self-locking and closed J232, and magnetic control switch K31, so that the motor runs; (pressing KN2 means selecting the up movement, and because K11 is disconnected in the circuit diagram, the down movement switch KN4 will not work); 1.2 When the switch KN3 is pressed to select the third floor, J3 works, and the normally open contact J31 of J3 is self-locking and closed, and forms a loop with the normally closed contact J13, the normally closed contact J231, and the magnetic switch K31; (In the circuit diagram, because K11 is disconnected, KN1 will not work, and only the second and third floors can be selected); When the switch KN5 is pressed to select the up movement, KN5 makes CJ2 work, and the normally open contact CJ21 of CJ2 is self-locking and closed, and forms a loop with the normally closed contact CJ12, (upper limit switch K5), self-locking and closed J34, and magnetic control switch K31 to make the motor run; (pressing KN2 means selecting the up movement, and because K11 is disconnected in the circuit diagram, the down switch KN4 will not work).

[0008] 2. When the freight elevator is on the second floor, K21 is disconnected, and K11 and K31 are closed. 2.1 When the switch KN1 is pressed to select the first floor, J1 works, and the normally open contact J11 of J1 is self-locking and closed, and forms a loop with the normally closed contact J33, the normally closed contact J221, and the magnetic switch K11; (In the circuit diagram, because K21 is disconnected, KN2 will not work, and only the first floor and the third floor can be selected); When the switch KN4 is pressed to select the downward direction, KN4 makes CJ1 work, and the normally open contact CJ11 of CJ1 is self-locking and closed, and forms a circuit with the normally closed contact CJ22, (lower limit switch K4), self-locking and closed J14, and magnetic control switch K11, so that the motor runs downward; (It can be seen from the circuit diagram that when the freight elevator is on the second floor, KN4 and KN5 can be used); 2.2 When the switch KN3 is pressed to select the third floor, J3 works, and the normally open contact J31 of J3 is self-locking and closed, and forms a loop with the normally closed contact J13, the normally closed contact J231, and the magnetic switch K31; (In the circuit diagram, because K21 is disconnected, KN2 will not work, and only the first floor and the third floor can be selected); When switch KN5 is pressed to select the upward direction, KN5 makes CJ2 work, and the normally open contact CJ21 of CJ2 is self-locking and closed, and forms a circuit with the normally closed contact CJ12, (upper limit switch K5), self-locking and closed J34, and magnetic control switch K31 to make the motor run; (It can be seen from the circuit diagram that when the freight elevator is on the second floor, KN4 and KN5 can both be used).

[0009] 3. When the freight elevator is on the third floor, K31 is disconnected, and K11 and K21 are closed. 3.1 When the switch KN2 is pressed to select the second floor, KN2 makes J2 work, and the normally open contact J21 of J2 is self-locking and closed, and forms a loop with the normally closed contact J12, the normally closed contact J32, and the magnetic switch K21; (In the circuit diagram, because K31 is disconnected, KN3 will not work, and only the first floor and the second floor can be selected); When the switch KN4 is pressed to select the downward direction, KN4 makes CJ1 work, and the normally open contact CJ11 of CJ1 is self-locking and closed, and forms a circuit with the normally closed contact CJ22, (lower limit switch K4), self-locking and closed J222, and magnetic control switch K11, so that the motor runs downward; (Pressing KN2 means selecting the downward direction, and because K31 is disconnected in the circuit diagram, the upward switch KN5 will not work); 3.2 When the switch KN1 is pressed to select the first floor, J1 works, and the normally open contact J11 of J1 is self-locking and closed, and forms a loop with the normally closed contact J33, the normally closed contact J221, and the magnetic switch K11; (In the circuit diagram, because K31 is disconnected, KN3 will not work, and only the first floor and the second floor can be selected); When the switch KN4 is pressed to select the downward direction, KN4 makes CJ1 work, and the normally open contact CJ11 of CJ1 is self-locking and closed, and forms a circuit with the normally closed contact CJ22, (lower limit switch K4), self-locking and closed J14, and magnetic control switch K11 to make the motor run downward; (pressing KN1 means selecting the downward direction, and because K31 is disconnected in the circuit diagram, the upward switch KN5 will not work).

[0010] The device is also provided with a lower limit switch K4 and an upper limit switch K5. The lower limit switch K4 is connected in series to a circuit for causing the motor to run downward when the switch KN4 is pressed, and the upper limit switch K5 is connected in series to a circuit for causing the motor to run upward when the switch KN5 is pressed.

[0011] The device is also provided with door closing operation switches B1, B2, B3 (i.e., the door closing operation switches B1, B2, B3 are respectively connected in series with the up circuit and the down circuit). When the doors of the three floors are all closed, the up circuit and the down circuit form a loop.

[0012] The device is also provided with emergency stop switches KN6, KN7 and KN8 on the first to third floors.

[0013] The device is also provided with a counting alarm module, which includes a normally open contact CJ13 in the fourth relay CJ1, a normally open contact CJ23 in the fifth relay CJ2, and a sixth relay J0; when the freight elevator goes down, the normally open contact CJ13 self-locks and closes, and forms a loop with the sixth relay J0; when the freight elevator goes up, the normally open contact CJ23 self-locks and closes, and forms a loop with the sixth relay J0, and the sixth relay J0 is externally connected to a counter.

[0014] The counting alarm module also includes an audible / visual alarm, which is connected in parallel with the relay J0.

[0015] The device also includes a floor display device, that is, the three floor magnetic control switches also include three contacts K21, K22, K32 with opposite states to the contacts K11, K21, K31 respectively. The floor display device includes three contacts K21, K22, K32 and their respective floor indicator lights. When the freight elevator is located on a certain floor, the contacts with opposite states to the floor form a loop with the indicator lights on the floor.

[0016] The device also includes a freight elevator door switch module, which includes freight elevator door control switches for three floors, and the freight elevator door control switch on each floor is connected in parallel with the indicator light on the floor.

[0017] The biggest feature of the freight elevator control device of the present application is that it only uses five small relays and other conventional components to complete various conversion processes of the three-story freight elevator that were previously implemented by PLC programming. And the line is self-locking, interlocking, and automatic switching. Moreover, it can lock the direction of the corresponding freight elevator at any floor and set any destination without any problems. It is easy to operate, safe and reliable. Moreover, there are fewer electrical components, which is convenient for mass production of products and widespread use by users. Even if the freight elevator control device temporarily fails, the maintenance personnel only need to replace the corresponding electrical components, and the previous line inspection is not required. This can be said to be the biggest difference and feature compared with the project research in the domestic elevator industry.

[0018] The functions and operation methods of the three-story freight elevator control device of the present application are as convenient as those of existing freight elevators. Even if the operator issues an erroneous command due to a wrong button on the operation panel of any floor, no safety accident will occur. Moreover, the running direction of the freight elevator can be changed at will. Even if a power outage occurs suddenly at any time, no accident will occur, because the original set instructions of the corresponding floor will be reset to zero. According to the operator's requirements, the up or down floor can be reset, and the running direction can be restored to the normal original state of the freight elevator by correctly operating the running direction. The design characteristics of the freight elevator control circuit follow the basic principles of few control circuit components, complete functions, low cost, easy to popularize, easy to operate for customers, and easy for customers to repair and maintain in the future, and are put on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the basic circuit structure diagram of the three-story freight elevator control device.

[0020] Figure 2 It is the schematic diagram of the equivalent circuit of the control switch.

[0021] Figure 3 It is a modular schematic diagram of the three-story freight elevator control device.

[0022] Figure 4 It is a schematic diagram of a three-story freight elevator control device with a counting and warning module.

[0023] Figure 5 It is a circuit structure diagram of a three-story freight elevator control device with a counting and warning module.

[0024] Figure 6 It is a schematic diagram of a three-story freight elevator control device with a freight elevator door switch, a floor display module, and a power module.

[0025] Figure 7 It is a circuit diagram of a three-story freight elevator control device with a freight elevator door switch and a floor display module.

[0026] Figure 8 This is a schematic diagram of the control panel of the three-story freight elevator control device.

[0027] Among them, the first relay J1, the second relay J2, the third relay J3, the fourth relay CJ1, the fifth relay CJ2, and the counting relay J0; The first relay J1 has a normally open contact J11, a normally closed contact J12, a normally closed contact J13, and a normally open contact J14; the second relay J2 has a normally open contact J21, a normally closed contact J221 and its associated normally open contact J222, a normally closed contact J231 and its associated normally open contact J232; the third relay J3 has a normally open contact J31, a normally closed contact J32, a normally closed contact J33, and a normally open contact J34; the fourth relay CJ1 has a normally open contact CJ11, a normally closed contact CJ12, and a normally open contact CJ13; the fifth relay CJ2 has a normally open contact CJ21, a normally closed contact CJ22, and a normally open contact CJ23; A first control switch KN1, a second control switch KN2, a third control switch KN3, a fourth control switch KN4, and a fifth control switch KN5; Two contacts K11 and K12 of the first-layer magnetic control switch, two contacts K21 and K22 of the second-layer magnetic control switch, two contacts K31 and K32 of the third-layer magnetic control switch; upper limit switch K4, lower limit switch K5; The first floor emergency stop switch is KN6, the second floor emergency stop switch is KN7, and the third floor emergency stop switch is KN8; The closed-door operation switches B1, B2, and B3 for the first to third floors. DETAILED DESCRIPTION

[0028] like Figure 1-8 As shown in the figure, the three-layer freight elevator control device mainly includes five relays, a control switch, and a magnetic control switch. Relays J1 to J3 can use conventional 220-volt small relays with four pairs of normally open and normally closed contacts. Relays J1 and J3 use two normally open contacts and two normally closed contacts, and relay J2 uses three normally open contacts and two normally closed contacts; relays CJ1 and CJ2 use two normally open contacts and one normally closed contact, and can use AC contactors.

[0029] KN1 to KN5 are the three-layer freight elevator control buttons. Figure 2 As shown, it is composed of three switches located on three floors connected in parallel.

[0030] Figure 7 Among them, K11, K12, K21, K22, K31, K32 are the contacts of the three-floor magnetic control switches, which are used to control the freight elevator floors. They are divided into normally closed points K11, K21, K31, and normally open points K12, K22, K32. When the freight elevator is at a certain floor, the normally closed contact of the magnetic control switch on the corresponding floor will automatically open, and the normally open contact will be connected.

[0031] Figure 1 The circuit structure shown is equivalent to Figure 3 The floor selection module and running direction selection module are the basic structure of this device and can be used as a separate product, which requires an additional independent switch gate circuit. Figure 1 Based on the circuit, you can add Figure 3 , 4 The counting and warning module shown in FIG. Figure 5 The product shown is an upgraded version of this device. Figure 1 Based on the circuit, you can add Figure 2 , 6 The circuit structure of the freight elevator door switch module and floor display module shown in FIG. Figure 7 As shown, it is also an upgraded product of this application, which contains a switch gate circuit. Figure 3 The present invention is a schematic diagram of a power module, a freight elevator door switch and a floor display module, a floor selection module, a running direction selection module, a counting and warning module. Due to the large length of the circuit diagram, it is shown separately in Figure 1 , 4 , 7, combine the circuit diagrams in 1, 4, and 7 to get Figure 4 The corresponding circuit diagram.

[0032] Design ideas for the three-story freight elevator control device:

[0033] Considering that the freight elevator is always at a certain floor when it is working, one of the magnetic switches K11, K21, and K31 is disconnected when the freight elevator stops at a certain floor, while the magnetic switches of the other two floors are connected, providing power to the relay CJ4 or CJ5, so that the control switches KN4 and KN5 can work, thereby providing power supply direction for the freight elevator to move up and down. And because the relays CJ4 and CJ5 each have a normally closed contact in the other circuit, they have an interlocking function. Therefore, when the freight elevator goes up or down, it can only complete one of the working states. So, when the freight elevator is on the first floor, it can only go up to the second or third floor; when the freight elevator is on the third floor, it can only go down to the next floor or the second floor; when the freight elevator is on the second floor, it can go up to the third floor or the next floor, and the freight elevator will not stop in the middle.

[0034] When the freight elevator is working, the doors of the three floors must be closed at the same time, and the closed door operation switches B1, B2, and B3 must be closed, so that a loop can be formed in the circuit. When the freight elevator is operated on any floor, there are always two other floors to choose from. At the same time, the design of the circuit has determined the direction in which the freight elevator should operate normally. If the wrong running direction is selected, the freight elevator will not work.

[0035] The three-story freight elevator control device is completely composed of the circuits of three relays J1, J2, and J3 and the states of magnetic switches K11, K21, and K31, which complete the direction selection of the freight elevator. Relays CJ1 and CJ2 also complete the up and down movement of the freight elevator. The concept of circuit design is to use five relays (including two AC contactors) and magnetic switches K1, K2, and K3, with the least electrical materials and the lowest cost, to safely and reliably complete the PLC computer programming and conversion and drive of various driving electrical components used in the domestic elevator industry, so as to achieve the normal operation of the freight elevator. This not only reduces the cost of circuit design, but also achieves the safety and reliability of freight elevator control. If there is a problem in any link, the freight elevator will not work.

[0036] Working principle of the three-story freight elevator control device:

[0037] 1. When the freight elevator is on the first floor, Figure 1 As shown, the magnetic switch contact K11 is open in the circuit. KN1 cannot form a loop, but KN2 and KN3 can form a loop. Therefore, the freight elevator can only go up to the second floor or the third floor, and the running direction has been locked to the upward direction.

[0038] 2. When the freight elevator is on the second floor, Figure 1 As shown, the magnetic switch contact K21 is open in the circuit. KN2 cannot form a loop, but KN1 and KN3 can form a loop, so the freight elevator can choose to go to the next floor or the third floor when it is in working state.

[0039] 3. When the freight elevator is on the third floor, Figure 1 As shown, the magnetic switch contact K31 is open in the circuit. KN3 cannot form a loop, but KN1 and KN2 can form a loop, so the direction of the freight elevator can only be set to the next floor or the next two floors. Moreover, the freight elevator will automatically stop when it reaches the set floor.

[0040] 4. When the freight elevator is on the first floor, it can only be set to the second and third floors; similarly, when the freight elevator is on the third floor, it can only be set to the first and second floors. When the freight elevator is on the second floor, it can be set to the third floor or the next floor. As long as the corresponding floor is set, the running direction of the freight elevator is naturally completed. Even if the operator presses other floors, the freight elevator will not work. For example, if the freight elevator wants to go from the first floor to the third floor, on the first floor operation panel, set the third floor, and then press the upper run button. The freight elevator will not stop casually on the second floor during operation.

[0041] 5. The freight elevator control panel on each of the three floors will show which floor the freight elevator is parked on. Figure 7 , 8 As shown. And the freight elevator can only open and close the door on the floor where it is running, and other floors cannot be controlled. When the freight elevator door on any floor is opened, the freight elevator must not run up and down.

[0042] 6. The doors of the three floors of the freight elevator all work independently. When the freight elevator is working, it can only be opened and closed when it is on the corresponding floor.

[0043] 7. Emergency stop switch and three-floor operation panel can be operated to facilitate the staff to correct or change the running direction of the freight elevator at any time.

[0044] The following describes the usage of the device to illustrate the circuit design and functional effects of the present application.

[0045] When the freight elevator door is opened at any floor, Figure 1 The normally closed door operation switches B1, B2, and B3 shown in the figure will be opened, so the freight elevator will not go up or down, because the power supply for up and down has been disconnected by the door operation switches, and a circuit can only be formed when all the elevator doors are closed. The freight elevator doors use independent drive motors and can be opened or closed separately.

[0046] Due to the adoption of Figure 2 The control switch shown, no matter which floor the freight elevator is on, as long as the freight elevator doors on all three floors are in closed state, any required operating floor and direction can be set on the control panel on any floor.

[0047] When the freight elevator is on the first floor Figure 1 , 7 As shown, the magnetic switch contact K11 changes from the normally closed state to the open state. K12 changes from the normally open state to the closed state, so that the first floor indicator light connected in series with K12 lights up, and the power supply of the corresponding floor door is turned on. At this moment, the normally closed magnetic switches K21 and K31 can provide working conditions for relays J2 and J3.

[0048] The control operation of the freight elevator has been set by the circuit, and it can only go up to the second or third floor. It is impossible to set the running direction. At this time, if you want to go to the second floor, you can select the second or third floor on the control panel of any of the first, second and third floors. Then press the up button. PLC computer programming is similar to this.

[0049] If you select the second floor on the control panel, first ensure that all the freight elevator doors on the three floors are in the closed state. You can press the KN2 switch on the operation panel of any floor (such as the first floor operation panel), and the second relay J2 in the circuit is energized, the normally open contact J21 is self-locked, and the normally open contact J232 is turned on. Let the relay J2 form a circuit through the contact J21, the normally closed contact J12, the normally closed contact J32, and the magnetic switch K21. Because when the relay J2 is energized, the normally open contact J232 is turned on, which provides the conditions for the freight elevator to rise and also provides the power supply direction for the relay CJ2. In other words, the normally open contact J232 is self-locked and closed due to the operation of the relay J2, so that the relay CJ2 can work when the rising button KN5 is pressed. Because the rising and falling circuits CJ1 and CJ2 in the circuit have interlocking functions. When CJ2 is working, CJ22 will be disconnected. At this moment, KN4 cannot work and CJ1 will not be energized. Moreover, as long as the control switch KN2 is pressed in the circuit to make the relay J2 work, the button indicator light in parallel with the relay J2 will light up.

[0050] Therefore, after the freight elevator selects a floor, just press the up button KN5 on the operation panel to make the AC contactor CJ2 work, and CJ21 changes from normally open to self-locking. The AC relay passes through the normally closed contact CJ12, the normally open contact CJ21 after self-locking, the normally closed point of the upper limit magnetic control switch K5, and then the normally open contact J233 after self-locking, and finally forms a power supply circuit through the normally closed contact K31 of the magnetic control switch, and the freight elevator works normally.

[0051] When the freight elevator goes up to the second floor, the magnetic switch contact K21 changes from normally closed to open, the relay J2 stops working, and the indicator light (LED light) connected in series with the contact K22 lights up. At the same time, the second floor door is powered and can be opened and closed.

[0052] The working status of the floor indicator light and the button indicator light are always opposite. The floor indicator light on the control panel is always on the floor where the freight elevator is located, while the button indicator light set for the freight elevator operation can only be on when the freight elevator is running. When the freight elevator reaches the corresponding floor, the button indicator light will go out and the floor indicator light will be on. The magnetic control switch K21 in the circuit can be understood as a midway switch.

[0053] Similarly, when the freight elevator is on the third floor, the control circuit is the opposite of the upward process from the first floor, except that the floor magnetic switch, the contact K31, plays a role here. At this time, K31 is turned on, and you can only go to the first or second floor. Because the freight elevator is on that floor, the magnetic switch on that floor is disconnected. The above description is about the operation from the first floor to the second and third floors. The principle of going down from the third floor is similar, and the process is the opposite.

[0054] Only when the freight elevator is on the second floor can it go up to the third floor or down to the next floor. Therefore, the three-story freight elevator control device and operation method basically complete all the functions of PLC. Three relays complete the circuit programming, and two AC relays control the forward and reverse rotation of the freight elevator motor. The freight elevator doors on the third floor must be closed before it can work normally.

[0055] In addition, K4 and K5 in the circuit are the lower limit and upper limit magnetic switches respectively. When CJ1 or CJ2 in the attached figure is out of control and cannot be disconnected for some reason, K4 and K5 play a secondary protection role here. When the freight elevator is about to exceed the range, K4 or K5 is triggered to disconnect, and the corresponding running direction stops. CJ1 and CJ2 in the circuit play an interlocking role in the circuit. In other words, when the freight elevator goes up, the down switch is automatically disconnected, and when the freight elevator goes down, the up switch is automatically disconnected.

[0056] Figure 5 CJ13 and CJ23 are for the working indicator lights on the operation panels of each floor to display when the freight elevator is running up and down, and can generate counting signals. A counting relay J0 is added, and no matter how many times the freight elevator works up and down, the external counter can be counted. The corresponding working times can be set. When this number is reached, the freight elevator control stops working to allow equipment maintenance, leaving a reliable maintenance basis.

[0057] The above process seems simple, but it has gone through years of exploration and design. From the research and invention of the project to the present, great efforts and costs have been paid. It is the comprehensive result of certain knowledge and experience. That is, the circuit components should be few, the functions should be perfect, the operation should be simple, the maintenance should be convenient, the work should be reliable, and at the same time, the staff's operating errors should be allowed, and no problems will occur. Ensure the safe operation and normal operation of the freight elevator.

[0058] Since it is a freight elevator, it only carries goods and no passengers, so there is no need for a control panel inside the freight elevator. The operation method of the three-story freight elevator control device is basically the same as that of a normal elevator. The difference is that the operator presses the door opening button on the operation panel on a certain floor, pushes the goods in, walks out of the freight elevator door, closes the freight elevator door normally, sets the operating floor first, and then presses the correct operating direction.

[0059] like Figure 1 As shown in the figure, by setting the closed door operation switches B1, B2, and B3, when the three-story freight elevator is working, it is required that the doors of each floor are closed before it can complete the up and down operation. And the freight elevator can only complete the opening and closing of the freight elevator door on the corresponding floor after it reaches the corresponding floor, such as Figure 7 As shown in the middle freight elevator door switch module, other floors cannot be controlled.

[0060] What should we do if the freight elevator suddenly encounters a power outage during normal operation? And the freight elevator does not stop at the first, second, or third floor. At this time, the operator can select the first or third floor on the operation panel on any floor, and then set the running direction. The freight elevator will return to normal after working at the first or third floor.

[0061] Whether the freight elevator is going up or down, the indicator lights on the operation panel of the three floors will be displayed at the same time. In addition, the counting relay J0 is connected to an external counter, and the counter can be set. Its normally closed point can be connected in series in the relevant circuit shown in the attached figure. If the counting relay is set to 1000 times, the freight elevator control will stop running when it reaches 1000 times.

[0062] The three-layer freight elevator control device uses only three relays and two AC relays. Through the arrangement and combination of the contacts of several relays, different working states are generated, the self-locking and interlocking process of the circuit is realized, the function of PLC is completed, and the running direction of the freight elevator can be locked. The lifting part of the freight elevator only needs two AC relays. In addition, the freight elevator can set the direction to go on any floor. On the operating panel on any floor, the working state of the freight elevator cannot be controlled on other floors, and there will be no wrong settings, problems or failures. Ensure that the freight elevator control system is safe and reliable.

[0063] The final effect is equivalent to the PLC computer programming commonly used in elevators. The difference is that it has fewer components and lower costs, which is convenient for repair and maintenance in the later work.

Claims

1. A three-layer freight elevator control device, characterized in that It includes the first to third relays (J1, J2, J3) for floor selection, each with a working indicator light, and the fourth and fifth relays (CJ1, CJ2) for down and up selection; The first relay J1 has a normally open contact J11, a normally closed contact J12, a normally closed contact J13, and a normally open contact J14; the second relay J2 has a normally open contact J21, a normally closed contact J221 and its associated normally open contact J222, a normally closed contact J231 and its associated normally open contact J232; the third relay J3 has a normally open contact J31, a normally closed contact J32, a normally closed contact J33, and a normally open contact J34; the fourth relay CJ1 has a normally open contact CJ11 and a normally closed contact CJ12; the fifth relay CJ2 has a normally open contact CJ21 and a normally closed contact CJ22; First to fifth control switches (KN1, KN2, KN3, KN4, KN5) for controlling five relays respectively, the control switches are formed by connecting three switches located on the first to third floors in parallel, so that the relays corresponding to the control switches can be controlled on each floor, the first to third control switches (KN1, KN2, KN3) are used as floor selection buttons, and the fourth and fifth control switches (KN4, KN5) are used as down buttons and up buttons respectively; and magnetically controlled switches for the first to third floors, each of which has contacts (K11, K21, K31). When the freight elevator is on one of the floors, the contact of the magnetically controlled switch corresponding to the floor is disconnected, and the other two are closed; 1. When the freight elevator is on the first floor, contact K11 is disconnected, and contacts K21 and K31 are closed. 1.1 When the switch KN2 is pressed to select the second floor, the switch KN2 makes the second relay J2 work, and the normally open contact J21 of the second relay J2 is self-locking and closed, and forms a loop with the normally closed contact J12, the normally closed contact J32, and the magnetic control switch contact K21; When the switch KN5 is pressed to select the up direction, the switch KN5 makes the fifth relay CJ2 work, and the normally open contact CJ21 of the fifth relay CJ2 is self-locking and closed, and forms a loop with the normally closed contact CJ12, the self-locking J232, and the magnetic control switch K31, so that the motor runs; 1.2 When the switch KN3 is pressed to select the third floor, J3 works, and the normally open contact J31 of J3 is self-locking and closed, and forms a loop with the normally closed contact J13, the normally closed contact J231, and the magnetic control switch K31; When the switch KN5 is pressed to select the up direction, KN5 makes CJ2 work, and the normally open contact CJ21 of CJ2 is self-locking and closed, and forms a loop with the normally closed contact CJ12, the self-locking and closed J34, and the magnetic control switch K31, so that the motor runs; 2. When the freight elevator is on the second floor, K21 is disconnected, and K11 and K31 are closed. 2.1 When the switch KN1 is pressed to select the first floor, J1 works, and the normally open contact J11 of J1 is self-locking and closed, and forms a loop with the normally closed contact J33, the normally closed contact J221, and the magnetic control switch K11; When the switch KN4 is pressed to select the downward direction, KN4 makes CJ1 work, and the normally open contact CJ11 of CJ1 is self-locking and closed, and forms a loop with the normally closed contact CJ22, the self-locking and closed J14, and the magnetic control switch K11, so that the motor runs downward; 2.2 When the switch KN3 is pressed to select the third floor, J3 works, and the normally open contact J31 of J3 is self-locking and closed, and forms a loop with the normally closed contact J13, the normally closed contact J231, and the magnetic control switch K31; When the switch KN5 is pressed to select the up direction, KN5 makes CJ2 work, and the normally open contact CJ21 of CJ2 is self-locking and closed, and forms a loop with the normally closed contact CJ1, the self-locking and closed J34, and the magnetic control switch K31, so that the motor runs; 3. When the freight elevator is on the third floor, K31 is disconnected, and K11 and K21 are closed. 3.1 When the switch KN2 is pressed to select the second floor, KN2 makes J2 work, and the normally open contact J21 of J2 is self-locking and closed, and forms a loop with the normally closed contact J12, the normally closed contact J32, and the magnetic control switch K21; When the switch KN4 is pressed to select the downward direction, KN4 makes CJ1 work, and the normally open contact CJ11 of CJ1 is self-locking and closed, and forms a loop with the normally closed contact CJ22, the self-locking and closed J222, and the magnetic control switch K11, so that the motor runs downward; 3.2 When the switch KN1 is pressed to select the first floor, J1 works, and the normally open contact J11 of J1 is self-locking and closed, and forms a loop with the normally closed contact J33, the normally closed contact J221, and the magnetic control switch K11; When the switch KN4 is pressed to select down, KN4 makes CJ1 work, and the normally open contact CJ11 of CJ1 is self-locking and closed, and forms a loop with the normally closed contact CJ22, the self-locking and closed J14, and the magnetic control switch K11, so that the motor runs downward.

2. A three-layer freight elevator control device as claimed in claim 1, characterized in that The device is also provided with a lower limit switch K4 and an upper limit switch K5. The lower limit switch K4 is connected in series to a circuit for causing the motor to run downward when the switch KN4 is pressed, and the upper limit switch K5 is connected in series to a circuit for causing the motor to run upward when the switch KN5 is pressed.

3. A three-layer freight elevator control device as claimed in claim 1, characterized in that The device is also provided with closed door operation switches B1, B2, B3. When the doors of the three floors are all closed, the upward circuit and the downward circuit form a loop.

4. A three-layer freight elevator control device as claimed in claim 1, characterized in that The device is also provided with emergency stop switches KN6, KN7 and KN8 on the first to third floors.

5. A three-layer freight elevator control device as claimed in claim 1, characterized in that The device is also provided with a counting alarm module, which includes a normally open contact CJ13 in the fourth relay CJ1, a normally open contact CJ23 in the fifth relay CJ2, and a sixth relay J0; when the freight elevator goes down, the normally open contact CJ13 self-locks and closes, and forms a loop with the sixth relay J0; when the freight elevator goes up, the normally open contact CJ23 self-locks and closes, and forms a loop with the sixth relay J0, and the sixth relay J0 is externally connected to a counter.

6. A three-layer freight elevator control device as claimed in claim 5, characterized in that The counting alarm module also includes an audible / visual alarm, which is connected in parallel with the relay J0.

7. A three-layer freight elevator control device as claimed in claim 1, characterized in that The device also includes a floor display device, that is, the three floor magnetic control switches also include three contacts K21, K22, K32 with opposite states to the contacts K11, K21, K31 respectively. The floor display device includes three contacts K21, K22, K32 and their respective floor indicator lights. When the freight elevator is located on a certain floor, the contacts with opposite states to the floor form a loop with the indicator lights on the floor.

8. A three-layer freight elevator control device as claimed in claim 7, characterized in that The device also includes a freight elevator door switch module, which includes freight elevator door control switches for three floors, and the freight elevator door control switch on each floor is connected in parallel with the indicator light on the floor.

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