Four-car guideway freight elevator with sto function and 6:1 suspension ratio

Abstract

The application provides a four-car guide rail freight elevator with STO function and a 6:1 suspension ratio, the freight elevator adopts a 6:1 suspension form, the car and the counterweight of the freight elevator are provided with six sections of traction ropes for traction, a traction main machine drives the relative up and down movement of the car and the counterweight through the traction ropes, the car is provided with two or more groups of safety gear linkage assemblies, different groups of the safety gear linkage assemblies have separate safety circuits, and the car is connected with each car guide rail through the safety gear linkage assemblies. The 6:1 suspension form adopted by the freight elevator can reduce the driving specification of traction, adapt to the trend that the elevator machine room space gradually becomes smaller, and the two or more groups of safety gear linkage assemblies have separate safety circuits, so that when one group of safety gears fails, the safety gears of other groups can still work, the safe operation of the elevator is ensured, and the safety of SIL3 can be realized.

Description

Technical Field

[0001] This invention relates to an improvement in the traction method of a freight elevator, specifically a four-car guide rail freight elevator with STO function and a 6:1 suspension ratio. Background Technology

[0002] The demand for freight elevators is evolving towards greater load capacity and higher safety. With the establishment of new industrial parks in various regions, the requirements for large-capacity freight elevators are constantly increasing. Traditional large-capacity freight elevators are usually only equipped with a limited number of single-set safety brakes and speed governors, and the main load-bearing structure is concentrated on individual guide rails. Therefore, they cannot effectively improve the operating efficiency of the elevators, and the safety of the elevators can no longer meet the new requirements. At the same time, the control cabinets used in traditional freight elevators are noisy during operation, and freight elevators do not have the same good sound insulation as passenger elevators, so the noise impact inside the freight elevator is greater.

[0003] The existing freight elevator car support structure mainly consists of six guide rails, distributed on both sides of the car. One pair of guide rails in the middle are the wider main guide rails, which play the main guiding and supporting role. Safety clamps and limiters are installed on the main guide rails. The remaining guide rails are the narrower auxiliary guide rails, which play an auxiliary guiding role. Because there is only one set of safety clamps and limiters, and the lateral support of the single main guide rail is poor, the stability and safety of operation are insufficient. Therefore, improvement is necessary. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned deficiencies in the prior art and to provide a four-car guide rail freight elevator with STO function and a suspension ratio of 6:1.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: the freight elevator adopts a 6:1 suspension form, and both the car and the counterweight of the freight elevator have 6 traction ropes. The traction host drives the relative up and down movement of the car and the counterweight through the traction ropes. The car of the freight elevator is equipped with two or more sets of safety gear linkage components. Different sets of safety gear linkage components have separate safety circuits. The car and each car guide rail are safely connected through the safety gear linkage components. The freight elevator adopts a 6:1 suspension configuration, which effectively increases the drive ratio of the traction machine. Both the car and counterweight have six traction ropes, increasing the traction distance and improving the smoothness of the elevator's operation. This also reduces the required traction drive force from the traction machine, allowing for smaller traction drive specifications and a smaller overall size, adapting to the trend of increasingly smaller elevator machine room spaces and facilitating maintenance. Furthermore, the freight elevator has two or more sets of safety clamp linkage components. The main actuator of these safety clamp linkage components is the brake clamp, which clamps the guide rail to achieve a safety braking function. Each of the two or more sets of safety clamp linkage components has its own safety circuit. If one set of safety clamps fails, the others can still operate, ensuring the safe operation of the elevator and achieving SIL3 safety standards.

[0006] Furthermore, the car has four movable pulleys that move with it, and two fixed pulleys are fixedly installed in the machine room above the car. The traction rope passes through the movable and fixed pulleys vertically. The counterweight has three movable pulleys that move with the counterweight frame, and two fixed pulleys are fixedly installed in the machine room above the counterweight frame. The traction rope alternately passes through the movable and fixed pulleys vertically. The traction rope between the car and the counterweight is connected to the traction host, which winds and drives the movement of the traction rope. The car position is equipped with four movable pulleys and two fixed pulleys, enabling the transmission of the traction rope through six sections. This achieves the main goal of saving the output power of the traction host, reducing energy consumption, decreasing noise, and saving construction costs.

[0007] Furthermore, the movable pulleys on the car are car rope pulleys, which have four individual counter-rotating pulleys. The first counter-rotating pulley is located on one side of the car, the second and third counter-rotating pulleys are located on both sides of the car's upper beam span, and the fourth counter-rotating pulley is located opposite the first counter-rotating pulley on the other side. The second and third counter-rotating pulleys are part of the same set of movable pulleys, and two sections of traction rope are threaded through them. The two counter-rotating pulleys are set according to the car's span to improve the balance of the traction car, avoid skewing during car operation, reduce wear, improve the reliability of product operation, and achieve the working requirement of 6-section traction.

[0008] Furthermore, the movable pulley on the counterweight is a counterweight rope pulley, which has three individual pulleys mounted on the counterweight frame. These three individual pulleys connect to six traction ropes, which pass sequentially through each individual pulley. One end of each traction rope is fixed, while the other end is controlled by the traction machine. The counterweight rope pulleys are arranged at the top of the counterweight frame and are designed to correspond to the thickness of the frame, achieving a 1:6 traction ratio for the counterweight frame. This also saves working space, machine room space, and allows for more space in the car.

[0009] Furthermore, the car is equipped with four car guide rails, which are arranged in pairs on both sides of the car. A safety clamp linkage assembly is installed on the car, divided into two groups. One group of safety clamp linkage assemblies is installed on each pair of car guide rails on opposite sides of the car. The braking actuation structure of the safety clamp linkage assembly is pre-positioned to contact the surface of the car guide rails. Both groups of safety clamp linkage assemblies are connected to the elevator control system via safety circuits. The car guide rails, which provide linear traction guidance for the car, are evenly distributed. The two sets of safety clamp linkage assemblies, arranged opposite each other, ensure the symmetrical balance of the elevator when braking is required, achieving the high safety requirements of the elevator.

[0010] Furthermore, all the car guide rails are linear guide rails of the same specification, distributed at the four corners. The intersection lines between the four car guide rails coincide with the center of gravity of the car. The sides of the car are slidably connected to the car guide rails via a braking actuator. The use of identical guide rail specifications ensures that the load of the elevator car is evenly distributed across the rails, preventing uneven loading and improving the stability of elevator operation. The uniform specifications of the guide rails also facilitate assembly and improve construction efficiency.

[0011] Furthermore, the car frame has a four-vertical-beam structure. These four vertical beams correspond to four adjacent and parallel car guide rails. Each of the four vertical beams is equipped with a braking actuator for the safety brake linkage assembly. The braking actuators are arranged according to the number of vertical beams and car guide rails. The car frame provides external rigidity for the car's spatial structure. The four-vertical-beam structure, distributed along the car guide rails, facilitates the distributed installation of the safety brake linkage assemblies, enabling independent operation of these assemblies.

[0012] Furthermore, the safety clamp linkage assembly is connected to the elevator control system via a safety circuit. This safety circuit includes an STO (Safety Torque Cancellation) circuit. The STO circuit compares the fault signals generated by the fault acquisition unit with the MCU (Microcontroller Unit) and outputs a PWM (Pulse Width Modulation) signal. This PWM signal reaches the traction machine controller, thereby limiting the traction machine's output power. The STO circuit primarily provides a safety torque cancellation function. By comparing fault signals and limiting motor output, it reduces or cancels the traction machine's power output, preventing mechanical conflicts caused by the traction machine's power output and improving operational safety.

[0013] Furthermore, after the STO circuit detects a fault signal, it limits the output power of the traction machine through PWM speed regulation. Within 200-500ms, the safety circuit of the safety gear linkage component is activated, and the execution part of the safety gear linkage component performs car braking. Different groups of safety gear linkage components use the same execution controller, and the execution response error of different groups of safety gear linkage components is less than 200ms. When the STO function intervenes in elevator operation, the safety gear linkage components achieve linkage operation and execute the braking function in a short time. The working error time of different groups of safety gears should also be reduced to avoid prolonged dragging problems.

[0014] Compared with the prior art, the present invention has the following advantages and effects: This design is an improvement on the suspension form of a freight elevator, which increases the operating drive ratio of the freight elevator, adapts to the miniaturization requirements of the traction host, and the car has a balanced distribution structure with multiple guide rails, which can reduce elevator swaying, avoid elevator skew, improve the car's anti-overturning ability, and has an STO function, which can promptly block the power output of the traction host, avoid mechanical conflict, and improve reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the car and the guide rails.

[0016] Figure 2 This is a schematic diagram of the lateral relative working structure of the car and the counterweight frame.

[0017] Figure 3 This is a schematic diagram showing the 6:1 suspension ratio between the car and the counterweight.

[0018] In the diagram: 1. Car, 2. Safety clamp linkage assembly, 3. Moving pulley, 4. Fixed pulley, 5. Traction main unit, 6. Traction rope, 7. Car rope pulley, 8. Counterweight rope pulley, 9. Guide rail. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0020] A four-car guide rail freight elevator with STO function and a 6:1 suspension ratio is disclosed. The freight elevator adopts a 6:1 suspension configuration. Both the car 1 and the counterweight of the freight elevator have 6 traction ropes 6. The traction host 5 drives the relative up and down movement of the car 1 and the counterweight through the traction ropes 6. The car 1 of the freight elevator is equipped with two or more sets of safety clamp linkage components 2. Different sets of safety clamp linkage components 2 have separate safety circuits. The car 1 and each car guide rail are safely connected through the safety clamp linkage components 2.

[0021] The car 1 has four movable pulleys 3 that move with the car 1. Two fixed pulleys 4 are fixedly installed in the machine room space above the car 1. The traction rope 6 passes through the movable pulleys 3 and fixed pulleys 4. The counterweight has three movable pulleys 3 that move with the counterweight frame. Two fixed pulleys 4 are fixedly installed in the machine room space above the counterweight frame. The traction rope 6 passes through the movable pulleys 3 and fixed pulleys 4 alternately. The traction rope 6 between the car 1 and the counterweight is connected by the traction host 5. The traction host 5 winds and drives the traction rope 6 to move.

[0022] The movable pulley 3 on the car 1 is the car rope pulley 7. The car rope pulley 7 has 4 separate anti-rope pulleys. The first anti-rope pulley is located on one side of the car 1, the second and third anti-rope pulleys are located on both sides of the upper beam span of the car 1, and the fourth anti-rope pulley is located opposite to the first anti-rope pulley on the other side. The second and third anti-rope pulleys are the same set of movable pulleys 3, and two traction ropes 6 are threaded through them.

[0023] The movable pulley 3 on the counterweight is the counterweight rope pulley 8. The counterweight rope pulley 8 has 3 individual pulleys and is installed on the counterweight frame. The 3 individual pulleys are connected to 6 traction ropes 6. The traction ropes 6 pass through each individual pulley in sequence. One end of the traction rope 6 is a fixed end, and the other end is controlled by the traction host 5.

[0024] The car 1 is equipped with four guide rails 9, which are arranged in pairs on both sides of the car 1. A safety clamp linkage assembly 2 is installed on the car 1. The safety clamp linkage assembly 2 is divided into two groups, with the same group of safety clamp linkage assemblies 2 installed on the guide rails 9 on both sides of the car 1. The braking actuation structure of the safety clamp linkage assembly 2 is pre-set to contact the surface of the guide rail 9. The two groups of safety clamp linkage assemblies 2 are respectively connected to the elevator control system through a safety circuit.

[0025] The car guide rails are all linear guide rails of the same specification. The car guide rails are distributed at the four corners. The intersection line between the four car guide rails coincides with the center of gravity of the car 1. The side of the car 1 is connected to the car guide rails through a braking actuator.

[0026] The car frame of the car 1 is a 4-vertical-beam structure. The 4 vertical beams of the car 1 correspond to 4 car guide rails that are adjacent to each other and parallel. Each of the 4 vertical beams of the car 1 is equipped with a braking execution structure of the safety clamp linkage assembly 2. The braking execution structure is set according to the number of vertical beams and car guide rails.

[0027] The safety clamp linkage component 2 is connected to the elevator control system through a safety circuit. The safety circuit is equipped with an STO circuit. The STO circuit compares the fault signal generated in the fault acquisition device with the MCU arithmetic unit and outputs a PWM signal. The PWM signal reaches the controller of the traction host 5 and limits the output power of the traction host 5.

[0028] After the STO circuit detects a fault signal, it limits the output power of the traction host 5 through PWM speed regulation. Within 200~500ms, the safety circuit of the safety gear linkage component 2 is connected, and the execution part of the safety gear linkage component 2 performs car braking. Different groups of safety gear linkage components 2 use the same execution controller, and the execution response error of different groups of safety gear linkage components 2 is less than 200ms.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative rather than restrictive in all respects, and the scope of the invention is defined by the claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description method is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A four-car guide rail freight elevator with STO function and a 6:1 suspension ratio, characterized in that: The freight elevator adopts a 6:1 suspension configuration. Both the car (1) and the counterweight of the freight elevator have 6 traction ropes (6). The traction host (5) drives the relative up and down movement of the car (1) and the counterweight through the traction ropes (6). The car (1) of the freight elevator is equipped with two or more sets of safety clamp linkage components (2). Different sets of safety clamp linkage components (2) have separate safety circuits. The car (1) and each car guide rail are safely connected through the safety clamp linkage components (2).

2. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 1, characterized in that: The car (1) has four movable pulleys (3) that move with the car (1). Two fixed pulleys (4) are fixedly installed in the machine room space above the car (1). The traction rope (6) passes through the movable pulleys (3) and fixed pulleys (4) up and down. The counterweight has three movable pulleys (3) that move with the counterweight frame. Two fixed pulleys (4) are fixedly installed in the machine room space above the counterweight frame. The traction rope (6) passes through the movable pulleys (3) and fixed pulleys (4) alternately up and down. The traction rope (6) between the car (1) and the counterweight passes through the traction host (5). The traction host (5) winds and drives the traction rope (6) to move through.

3. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 2, characterized in that: The movable pulley (3) on the car (1) is the car rope pulley (7). The car rope pulley (7) has 4 separate anti-rope pulleys. The first anti-rope pulley is located on one side of the car (1), the second and third anti-rope pulleys are located on both sides of the upper beam span of the car (1), and the fourth anti-rope pulley is located opposite to the other side of the first anti-rope pulley. The second and third anti-rope pulleys are the same set of movable pulleys (3) and two traction ropes (6) are threaded through them.

4. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 2, characterized in that: The movable pulley (3) on the counterweight is the counterweight rope pulley (8). The counterweight rope pulley (8) has 3 individual pulleys and is installed on the counterweight frame. The 3 individual pulleys are connected to 6 traction ropes (6). The traction ropes (6) pass through each individual pulley in sequence. One end of the traction rope (6) is a fixed end, and the other end is controlled by the traction host (5).

5. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 1, characterized in that: The car (1) is equipped with four guide rails (9). The four guide rails (9) are arranged opposite each other on both sides of the car (1). The car (1) is equipped with a safety clamp linkage assembly (2). The safety clamp linkage assembly (2) is divided into two groups. The same group of safety clamp linkage assemblies (2) is arranged on one group of guide rails (9) opposite each other on both sides of the car (1). The braking execution structure of the safety clamp linkage assembly (2) is pre-set to contact the surface of the guide rail (9). The two groups of safety clamp linkage assemblies (2) are respectively connected to the elevator control system through a safety circuit.

6. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 5, characterized in that: The car guide rails are all straight guide rails of the same specification. The car guide rails are distributed at the four corners. The intersection line between the four car guide rails coincides with the center of gravity of the car (1). The side of the car (1) is connected to the car guide rails through a braking actuator.

7. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 6, characterized in that: The car frame of the car (1) is a 4-vertical-beam structure. The 4 vertical beams of the car (1) correspond to the 4 car guide rails and are arranged close to each other and in parallel. The 4 vertical beams of the car (1) are all equipped with the braking execution structure of the safety clamp linkage assembly (2). The braking execution structure corresponds to the number of vertical beams and car guide rails and is set accordingly.

8. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 5, characterized in that: The safety clamp linkage component (2) is connected to the elevator control system through a safety circuit. The safety circuit is equipped with an STO circuit. The STO circuit compares the fault signal generated in the fault collector with the MCU arithmetic unit and outputs a PWM signal. The PWM signal reaches the controller of the traction host (5) and limits the output power of the traction host (5).

9. The four-car guide rail freight elevator with STO function and a 6:1 suspension ratio as described in claim 8, characterized in that: After the STO circuit detects the fault signal, it limits the output power of the traction host (5) through PWM speed regulation. Within 200~500ms, the safety circuit of the safety gear linkage component (2) is connected, and the execution part of the safety gear linkage component (2) performs car braking. The safety gear linkage components (2) of different groups use the same execution controller, and the execution response error of the safety gear linkage components (2) of different groups is less than 200ms.

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