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 utility model relates to a control device for a three - layer freight elevator, belonging 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 - layer freight elevators is particularly special and important. Since modern factories mostly adopt a three - layer structure, with the first floor being the production workshop and the second and third floors being the office areas and warehouses, three - layer freight elevators are often required.

[0003] However, most of the existing three - layer freight elevators use PLC devices as control circuits. Their disadvantage is that the cost of PLC devices is relatively high and they are relatively prone to failures. Once a problem occurs, the whole 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 achieve the control of a three - layer freight elevator and provide another solution for the existing three - layer freight elevators. Summary of the Invention

[0005] The purpose of the utility model is to provide a control device for a three - layer freight elevator to overcome the deficiencies of the prior art.

[0006] A control device for a three - layer freight elevator, characterized by comprising first to third relays (J1, J2, J3) with working indicators respectively for floor selection, and fourth and fifth relays (CJ1, CJ2) for downward and upward selection;

[0007] Among them, the first relay J1 has normally open contacts J11, normally closed contacts J12, normally closed contacts J13, and normally open contacts J14; the second relay J2 has normally open contacts J21, normally closed contact J221 and its associated normally open contact J222, normally closed contact J231 and its associated normally open contact J232; the third relay J3 has normally open contacts J31, normally closed contacts J32, normally closed contacts J33, and normally open contacts J34; the fourth relay CJ1 has normally open contacts CJ11 and normally closed contacts CJ12; the fifth relay CJ2 has normally open contacts CJ21 and normally closed contacts CJ22;

[0008] First to fifth control switches (KN1, KN2, KN3, KN4, KN5) for controlling the five relays respectively. The control switches are formed by paralleling three switches located on the first to third floors respectively, so that the relay corresponding to the control switch 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 the downward button and the upward button respectively;

[0009] and the magnetron switches on the first to third floors. The magnetron switches on the first to third floors respectively have contacts (K11, K21, K31). When the freight elevator is on a certain floor, the contact of the magnetron switch corresponding to that floor is disconnected, and the other two are closed.

[0010] 1. When the freight elevator is on the first floor, the contact K11 is disconnected, and the contacts K21 and K31 are closed.

[0011] 1.1 When the switch KN2 is pressed to select the second floor, the switch KN2 makes the second relay J2 work. The normally open contact J21 of the second relay J2 is self-locked and closed, and forms a loop with the normally closed contact J12, the normally closed contact J32, and the magnetron switch contact K21; (in the circuit diagram, because K11 is disconnected, KN1 will not work, and only the second and third floors can be selected);

[0012] When the switch KN5 is pressed to select going up, the switch KN5 makes the fifth relay CJ2 work. The normally open contact CJ21 of the fifth relay CJ2 is self-locked and closed, and forms a loop with the normally closed contact CJ12, (the upper limit switch K5), the self-locked and closed J232, and the magnetron switch K31, making the motor run upward; (pressing KN2 means selecting going up. In the circuit diagram, because K11 is disconnected, the downward switch KN4 will not work);

[0013] 1.2 When the switch KN3 is pressed to select the third floor, J3 works. The normally open contact J31 of J3 is self-locked and closed, and forms a loop with the normally closed contact J13, the normally closed contact J231, and the magnetron switch K31; (in the circuit diagram, because K11 is disconnected, KN1 will not work, and only the second and third floors can be selected);

[0014] When the switch KN5 is pressed to select going up, KN5 makes CJ2 work. The normally open contact CJ21 of CJ2 is self-locked and closed, and forms a loop with the normally closed contact CJ12, (the upper limit switch K5), the self-locked and closed J34, and the magnetron switch K31, making the motor run upward; (pressing KN2 means selecting going up. In the circuit diagram, because K11 is disconnected, the downward switch KN4 will not work).

[0015] 2. When the freight elevator is on the second floor, K21 is disconnected, and K11 and K31 are closed.

[0016] 2.1 When the switch KN1 is pressed to select the first floor, J1 works. The normally open contact J11 of J1 is self-locked and closed, and forms a loop with the normally closed contact J33, the normally closed contact J221, and the magnetron switch K11; (in the circuit diagram, because K21 is disconnected, KN2 will not work, and only the first and third floors can be selected);

[0017] When the switch KN4 is pressed to select the downward direction, KN4 makes CJ1 operate. The normally open contact CJ11 of CJ1 closes self-locked, and forms a circuit with the normally closed contact CJ22, (lower limit switch K4), the self-locked J14, and the magnetic control switch K11, causing the motor to run downward; (as can be seen from the circuit diagram, when the freight elevator is on the second floor, both KN4 and KN5 can be used);

[0018] 2.2 When the switch KN3 is pressed to select the third floor, J3 operates. The normally open contact J31 of J3 closes self-locked, and forms a circuit with the normally closed contact J13, the normally closed contact J231, and the magnetic control switch K31; (in the circuit diagram, since K21 is open, KN2 will not operate, and only the first and third floors can be selected);

[0019] When the switch KN5 is pressed to select the upward direction, KN5 makes CJ2 operate. The normally open contact CJ21 of CJ2 closes self-locked, and forms a circuit with the normally closed contact CJ12, (upper limit switch K5), the self-locked J34, and the magnetic control switch K31, causing the motor to run upward; (as can be seen from the circuit diagram, when the freight elevator is on the second floor, both KN4 and KN5 can be used).

[0020] 3. When the freight elevator is on the third floor, K31 is open, and K11 and K21 are closed.

[0021] 3.1 When the switch KN2 is pressed to select the second floor, KN2 makes J2 operate. The normally open contact J21 of J2 closes self-locked, and forms a circuit with the normally closed contact J12, the normally closed contact J32, and the magnetic control switch K21; (in the circuit diagram, since K31 is open, KN3 will not operate, and only the first and second floors can be selected);

[0022] When the switch KN4 is pressed to select the downward direction, KN4 makes CJ1 operate. The normally open contact CJ11 of CJ1 closes self-locked, and forms a circuit with the normally closed contact CJ22, (lower limit switch K4), the self-locked J222, and the magnetic control switch K11, causing the motor to run downward; (pressing KN2 means selecting the downward direction. In the circuit diagram, since K31 is open, the upward switch KN5 will not operate);

[0023] 3.2 When the switch KN1 is pressed to select the first floor, J1 operates. The normally open contact J11 of J1 closes self-locked, and forms a circuit with the normally closed contact J33, the normally closed contact J221, and the magnetic control switch K11; (in the circuit diagram, since K31 is open, KN3 will not operate, and only the first and second floors can be selected);

[0024] When the switch KN4 is pressed to select the downward movement, KN4 makes CJ1 operate. The normally open contact CJ11 of CJ1 is self-locked and closed, and forms a circuit with the normally closed contact CJ22, (the lower limit switch K4), the self-locked and closed J14, and the magnetic control switch K11, causing the motor to run downward; (Pressing KN1 means selecting downward. In the circuit diagram, since K31 is disconnected, the upward switch KN5 will not operate).

[0025] 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 in the circuit where the motor runs downward when the switch KN4 is pressed, and the upper limit switch K5 is connected in series in the circuit where the motor runs upward when the switch KN5 is pressed.

[0026] The device is also provided with door closing operation switches B1, B2, and B3, (that is, the door closing operation switches B1, B2, and B3 are respectively connected in series with the upward circuit and the downward circuit). Only when the three-floor doors are all closed can the upward circuit and the downward circuit form a loop.

[0027] The device is also provided with emergency stop switches KN6, KN7, and KN8 from the first floor to the third floor.

[0028] The device is also provided with a counting and alarm module, which includes the normally open contact CJ13 in the fourth relay CJ1, the normally open contact CJ23 in the fifth relay CJ2, and the sixth relay J0; when the freight elevator runs downward, the normally open contact CJ13 is self-locked and closed, and forms a circuit with the sixth relay J0; when the freight elevator runs upward, the normally open contact CJ23 is self-locked and closed, and forms a circuit with the sixth relay J0, and the sixth relay J0 is externally connected to a counter.

[0029] The counting and alarm module also includes a sound / light alarm, and the sound / light alarm is connected in parallel with the relay J0.

[0030] The device also includes a floor display device, that is, the three floor magnetic control switches also respectively include three contacts K21, K22, and K32 with states opposite to those of the contacts K11, K21, and K31. The floor display device includes the three contacts K21, K22, and K32 and their respective floor indicator lights. When the freight elevator is at a certain floor, the contact with the opposite state on this floor forms a circuit with the indicator light on this floor.

[0031] The device also includes a freight elevator door switch module. The freight elevator door switch module includes freight elevator door control switches on three floors, and the freight elevator door control switch on each floor is connected in parallel with the indicator light on this floor.

[0032] The biggest feature of the freight elevator control device of this application is that only five conventional components such as small relays can complete various conversion processes of a three-story freight elevator that were previously achieved by PLC programming. And it has achieved line self-locking, interlocking, and automatic switching. Moreover, at any floor, when setting any destination, the corresponding freight elevator direction can be locked without any problems, and the operation is convenient, safe, and reliable. In addition, there are few electrical components, which is convenient for mass production of products and extensive use by users. Even if the freight elevator control device temporarily fails, it only requires maintenance personnel to replace the corresponding electrical components, and there is no need for the previous line troubleshooting. This can be said to be the biggest difference and feature compared with the project research in the domestic elevator industry.

[0033] The functions and operation methods of the three-story freight elevator control device of this application are as convenient as those of existing freight elevators. It allows operation on the operation panel at any floor. Even if the operator issues a wrong command due to misoperation, no safety accident will occur. Moreover, it can be used to arbitrarily change the running direction of the freight elevator. Even if a power outage suddenly occurs at any time, no accident will occur because the original commands set at the corresponding floors will be cleared. According to the operator's requirements, reset the upper or lower end floors and correctly operate the running direction, and the normal original state of the freight elevator can be restored. The design features of the freight elevator control circuit follow the basic principles of having few control circuit components, perfect functions, low cost, being convenient for wide popularization, easy for customers to operate, and convenient for customers' later maintenance and repair, and are put on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the basic circuit structure diagram of the three-story freight elevator control device.

[0035] Figure 2 It is the schematic diagram of the equivalent circuit of the control switch.

[0036] Figure 3 It is the modular schematic diagram of the three-story freight elevator control device.

[0037] Figure 4 It is the schematic diagram of the three-story freight elevator control device with a counting and warning module.

[0038] Figure 5 It is the circuit structure diagram of the three-story freight elevator control device with a counting and warning module.

[0039] Figure 6 It is the schematic diagram of the three-story freight elevator control device with a freight elevator door switch, floor display module, and power supply module.

[0040] Figure 7 It is the circuit structure diagram of the three-story freight elevator control device with a freight elevator door switch and floor display module.

[0041] Figure 8 It is the schematic diagram of the control panel of the three-story freight elevator control device.

[0042] Among them, there are a first relay J1, a second relay J2, a third relay J3, a fourth relay CJ1, a fifth relay CJ2, and a counting relay J0;

[0043] 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;

[0044] 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;

[0045] 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; an upper limit switch K4, a lower limit switch K5;

[0046] A first - layer emergency stop switch KN6, a second - layer emergency stop switch KN7, a third - layer emergency stop switch KN8;

[0047] Closed - door operation switches B1, B2, and B3 for the first to third floors. Detailed implementation method

[0048] As Figure 1-8 shown, the control device for a three - layer freight elevator mainly includes five relays, control switches, and magnetic control switches. Among them, relays J1 to J3 can use conventional 220 - volt small relays, which have four pairs of normally open and normally closed contacts. Relays J1 and J3 use two normally open contacts and two normally closed contacts, relay J2 uses three normally open contacts and two normally closed contacts; relays CJ1 and CJ2 use two normally open and one normally closed contact, and can use AC contactors.

[0049] KN1 to KN5 are all control buttons for the three - layer freight elevator. As Figure 2 shown, they are formed by paralleling three switches located on three floors.

[0050] Figure 7Among them, K11, K12, K21, K22, K31, and K32 are the contacts of three floor magnetic control switches used to control the floors of the freight elevator. They are divided into normally closed contacts K11, K21, K31 and normally open contacts K12, K22, K32. When the freight elevator is on a certain floor, the normally closed contact of the corresponding floor magnetic control switch automatically opens, while the normally open contact closes.

[0051] Figure 1 The circuit structure shown is equivalent to Figure 3 the floor selection module and the running direction selection module in, which are the basic structures of this device and can be used as separate products. They need to cooperate with an additional independent door opening and closing circuit. In Figure 1 Based on the circuit, Figure 3 and 4 the counting and warning module shown can be added. The circuit structure of the counting and warning module is as shown in Figure 5 and it is an upgraded product of this device. In Figure 1 Based on the circuit, Figure 2 and 6 the freight elevator door switch module and the floor display module shown can be added. Their circuit structures are as shown in Figure 7 and they are also upgraded products of this application and contain a door opening and closing circuit themselves. And Figure 3 shows a schematic diagram of the present invention having a power supply module, a freight elevator door switch and floor display module, a floor selection module, a running direction selection module, and a counting and warning module. Since the circuit diagram is relatively large in size, it is respectively shown in Figure 1 and 4 7. Combining the circuit diagrams in 1, 4, and 7 is the Figure 4 corresponding circuit diagram.

[0052] Design concept of the three - floor freight elevator control device:

[0053] Considering that the freight elevator is always on a certain floor during operation, when the freight elevator stops on a certain floor, one of the magnetic control switches K11, K21, K31 is disconnected, and the magnetic control switches of the other two floors are connected, providing power for the relay CJ4 or CJ5, so that the control switches KN4 and KN5 can work, thus providing the power supply path for the up and down operation of the freight elevator. Also, since each of the relays CJ4 and CJ5 has a normally closed contact in the other's circuit, they have an interlocking function. Therefore, the freight elevator can only complete one of the working states of ascending or descending. That is to say, 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 first or second floor; when the freight elevator is on the second floor, it can go up to the third floor or down to the first floor, and the freight elevator will not stop in the middle.

[0054] When the freight elevator is working, the freight elevator doors on the three floors must first be ensured to be in the closed state at the same time, and the door closing operation switches B1, B2, and B3 are closed so that a circuit can be formed in the circuit. When the freight elevator is operated on any floor, there will always be choices for the other two floors. At the same time, the circuit design has determined the direction in which the freight elevator should operate normally. If the wrong direction is selected, the freight elevator will not work.

[0055] The control device of the three-floor freight elevator completes the direction selection of the freight elevator entirely by the circuits of three relays J1, J2, and J3 and the states of the magnetic control switches K11, K21, and K31. The relays CJ1 and CJ2 complete the up and down operation of the freight elevator. The concept of the circuit design is to use five relays (including two AC contactors) and the magnetic control switches K1, K2, and K3 to complete the conversion and drive of the PLC computer programming and various drive electrical components used in the domestic elevator industry with the least electrical materials and the lowest cost, ensuring the normal operation of the freight elevator safely and reliably. That is, it not only reduces the cost of the circuit design but also achieves the safety and reliability of the freight elevator control. If there is a problem with any link, the freight elevator will not work.

[0056] Working principle of the three-floor freight elevator control device:

[0057] 1. When the freight elevator is on the first floor, as Figure 1 shown, the contact of the magnetic control switch K11 is open in the circuit. KN1 cannot form a circuit, while KN2 and KN3 can form a circuit. Therefore, the working state of the freight elevator is that it can only choose to go to the second floor or the third floor, and the running direction is locked upward.

[0058] 2. When the freight elevator is on the second floor, as Figure 1 shown, the contact of the magnetic control switch K21 is open in the circuit. KN2 cannot form a circuit, while KN1 and KN3 can form a circuit. So, the working state of the freight elevator can be to go to the first floor or the third floor.

[0059] 3. When the freight elevator is on the third floor, as Figure 1 shown, the contact of the magnetic control switch K31 is open in the circuit. KN3 cannot form a circuit, while KN1 and KN2 can form a circuit. So, the direction of the freight elevator can only be set to go to the first floor or the second floor. Moreover, when the freight elevator reaches the set floor, it will stop automatically.

[0060] 4. When the freight elevator is on the first floor, it can only be set to go to the second and third floors; similarly, when the freight elevator is on the third floor, it can only be set to go to the first and second floors. When the freight elevator is on the second floor, it can be set to go to the third floor or the first floor. Once 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, after setting the third floor on the operation panel on the first floor and then pressing the up operation button, the freight elevator will not stop randomly on the second floor during operation.

[0061] 5. The floor where the freight elevator stops is displayed on the control panels of the freight elevators on all three floors. For example, Figure 7 、 8 as shown. Moreover, the freight elevator is designed such that it can only open and close its doors when it reaches the designated floors, and cannot be controlled on other floors. When the freight elevator door on any floor is opened, the freight elevator must not move up or down.

[0062] 6. The door switches of the freight elevator on the three floors work independently. During operation, the freight elevator can only be opened and closed on the corresponding floors.

[0063] 7. The emergency stop switch can be operated on the operation panels on all three floors. This is to facilitate the staff to correct or change the running direction of the freight elevator at any time.

[0064] Usage method:

[0065] The following describes the usage method of this device to illustrate the circuit design and functional effects of this application.

[0066] When the freight elevator door is opened on any floor, such as Figure 1 as shown, the normally closed door closing operation switches B1, B2, and B3 will be opened. Therefore, the freight elevator will not move up or down because the power supply for up and down has been disconnected by the door closing operation switches, and a circuit can only be formed when all the elevator doors are closed. The freight elevator doors are driven by independent motors and can be opened or closed separately.

[0067] Due to the adoption of the Figure 2 control switches as shown, regardless of which floor the freight elevator is on, as long as the freight elevator doors on all three floors are in the closed state, the desired running floor and direction can be set on the control panel on any floor.

[0068] When the freight elevator is on the first floor, such as Figure 1 、 7 as shown, the magnetic control switch contact K11 changes from the normally closed state to the open state. K12 changes from the normally open state to the closed state, causing the first floor indicator light in series with K12 to light up and simultaneously turning on the power supply for the corresponding floor door. At this moment, the normally closed magnetic control switches K21 and K31 can provide working conditions for the relays J2 and J3.

[0069] The control operation of the freight elevator has been set by the circuit and can only go up to the second or third floor. It is impossible to set the running direction down. At this time, if you are ready to go up to the second floor, you can select the second and third floors on the control panel on any of the first, second, and third floors. Then press the up button. The PLC computer programming is similar.

[0070] If it is selected to go to the second floor on the control panel, first ensure that all the freight elevator doors on the three floors are in the closed state. On the operation panel of any floor (such as the operation panel on the first floor), press the KN2 switch first. The second relay J2 in the circuit is attracted, the normally open contact J21 is self-locked, and the normally open contact J232 is conducted. Let the relay J2 form a loop through the contact J21, the normally closed contact J12, the normally closed contact J32, and the magnetic control switch K21. Also, when the relay J2 is attracted, the normally open contact J232 is conducted, providing the rising condition for the freight elevator and also providing the power path for the relay CJ2. That is to say, the normally open contact J232 is self-locked and closed due to the operation of the relay J2, so that when the up button KN5 is pressed, the relay CJ2 can work. And because the lifting circuits CJ1 and CJ2 in the circuit have an interlock function. When CJ2 works, CJ22 will be disconnected, and at this moment, KN4 cannot work and CJ1 will not be attracted. Moreover, as long as the control switch KN2 is pressed in the circuit to make the relay J2 work, the button indicator lights in parallel with the relay J2 will all light up.

[0071] Therefore, after the freight elevator selects a floor, as long as the up button KN5 is pressed on the operation panel to make the AC contactor CJ2 work, CJ21 changes from normally open to self-locked. The AC relay forms a power loop through the normally closed contact CJ12, the self-locked normally open contact CJ21, the normally closed point of the upper limit magnetic control switch K5, then through the self-locked normally open contact J233, and finally through the normally closed contact K31 of the magnetic control switch, and the freight elevator works normally.

[0072] When the freight elevator rises to the second floor, the magnetic control switch contact K21 changes from the normally closed state to the open state, the relay J2 stops working, and the indicator light (LED light) in series with the contact K22 lights up. At the same time, the second-floor door has power supply and can be opened and closed.

[0073] The working states of the floor indicator lights and the button indicator lights are always opposite. The floor indicator lights on the control panel always light up on the floor where the freight elevator is located, while the button indicator lights set for the operation of the freight elevator can only light up during the operation of the freight elevator. When the freight elevator runs to the corresponding floor, the button indicator lights will go out and the floor indicator lights will light up. The magnetic control switch K21 in the circuit can be understood as an intermediate switch.

[0074] Similarly, when the freight elevator is on the third floor, the control circuit is exactly the opposite of the process from the first floor upwards. Only the floor magnetic control switch, and here the contact K31 plays a role. At this time, K31 is opened, and it can only go down to the first floor or the second floor. Because the freight elevator is on that floor, the magnetic control switch on that floor is disconnected. What was described above is the operation from the first floor to the second and third floors, and the principle of going down from the third floor is similar, and the process is exactly the opposite.

[0075] Only when the freight elevator is on the second floor can it go to the third floor or go down to the first floor. Therefore, the control device and operation method of the three-story freight elevator basically complete all the functions of the 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 must be in a state where all the three-story freight elevator doors are closed to work properly.

[0076] In addition, K4 and K5 in the circuit are the lower limit and upper limit magnetic control switches respectively. When CJ1 or CJ2 in the attached figure fails to disconnect due to some reason, K4 and K5 play a secondary protection role here. When the freight elevator travel is about to exceed the range, K4 or K5 is triggered to disconnect, and the corresponding running direction stops running. CJ1 and CJ2 in the circuit play an interlocking role. That is to say, 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.

[0077] Figure 5 CJ13 and CJ23 are for the working indicator lights on the operation panels of each floor to display when the freight elevator goes up and down, and can generate counting signals. An additional counting relay J0 is added. No matter how many times the freight elevator works up and down, the external counter can be made to count. The corresponding number of working times can be set. When this number is reached, the freight elevator control stops working to provide a reliable basis for equipment maintenance.

[0078] The above process seems simple, but it has taken many years of exploration and design. Since the project research and invention, great efforts and costs have been paid, which is the comprehensive result of certain knowledge and experience. That is, there should be few circuit components, 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 operation errors of the staff should be allowed without any problems. Ensure the safe operation and normal running of the freight elevator.

[0079] Operating characteristics of the three-story freight elevator:

[0080] Since it is a freight elevator, only goods are loaded inside and there are 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 after the operator presses the door open button on the operation panel on a certain floor, the goods are pushed in, the person walks out of the freight elevator door, closes the freight elevator door properly, first sets the running floor, and then presses the correct running direction.

[0081] As Figure 1 shown, by setting the door closing operation switches B1, B2, and B3, when the three-story freight elevator works, it is required that all the doors on each floor are in the closed state to complete the up and down operation. And after the freight elevator reaches the corresponding floor, the freight elevator door of the corresponding floor can be opened and closed. As Figure 7 shown in the freight elevator door switch module, the other floors cannot be controlled.

[0082] During the normal operation of the freight elevator, what should be done in case of a sudden power outage, and the elevator stops at a position other than the first, second, or third floor. At this time, the operator can select the first or third floor on the operation panel of any floor and then set the running direction. After the elevator reaches the first or third floor, it will return to the normal state.

[0083] Regardless of whether the freight elevator goes up or down, the indicator lights on the operation panels of the three floors will be displayed simultaneously. In addition, the counting relay J0 is externally connected to a counter, which can be set. Its normally closed point can be connected in series in the relevant circuit shown in the attached drawing. For example, if the counting relay is set to 1000 times, when it reaches this number, it will stop the operation of the elevator control.

[0084] The control device of the three-story freight elevator only uses three relays and two AC relays. Through the arrangement and combination of the contacts of several relays, different working states are generated, realizing the self-locking and interlocking processes of the circuit, completing the functions of the PLC, and can lock the running direction of the freight elevator. For the lifting part of the freight elevator, only two AC relays are needed to complete. Moreover, the freight elevator can set the direction to go at any floor. On the operation panel of any floor, other floors cannot control the working state of the freight elevator, and no incorrect settings, problems, or faults will occur. Ensure the safety and reliability of the freight elevator control system.

[0085] Its final effect is equivalent to the common PLC computer programming of elevators. The difference is that it has fewer components, lower cost, and is convenient for maintenance and repair in 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 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.

7. A three-layer freight elevator control device as claimed in claim 6, 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.

Images