Elevator system

Abstract

The invention discloses an elevator system which comprises a lifting channel, a lift car, a counterweight, a driving device, a traction rope and a control device. The lift car is connected with the counterweight through a traction rope; under the control of the control device, the driving device drives the lift car to vertically move along the lifting channel through the traction rope and drives the counterweight to vertically move along the lifting channel and reversely move relative to the lift car at the same time. The elevator system comprises a plurality of balancing weights and a balancing weight loading device. Before the elevator system operates every time, the balancing weight loading device adjusts the weight of the balancing weight loaded on the counterweight or the car according to the load value in the car, so that the weight on the car side and the weight on the counterweight side tend to be balanced. Compared with the prior art, the system capacity and the size of the driving device and the control device can be reduced, and great benefits are brought to reduction of the design difficulty of an elevator system, reduction of operation faults and prolonging of the service life.

Description

Technical Field

[0001] The present invention relates to the field of elevator technology, and in particular to an elevator system. Specifically, a conceptual elevator with "perfect matching" of car and counterweight is proposed, which can effectively reduce the capacity requirement of the elevator power system and achieve energy saving and efficiency improvement. Background Art

[0002] At present, the most commonly used elevator in the elevator industry is the traction principle elevator. Most of the passenger elevators, freight elevators, and sightseeing elevators that we can see in our daily lives are traction elevators. In the traction elevator system, a counterweight is set. The car and the counterweight are connected by a traction rope and suspended on both sides of the drive device. Under the control of the control device, the drive device drives the car to move vertically along the lifting channel through the traction rope, and at the same time drives the counterweight to move vertically along the lifting channel and in the opposite direction relative to the car. The counterweight plays a balancing role during operation.

[0003] In the traction system, the car weight is W1, the rated load of the car is CAP, and the counterweight weight W2 is: the relationship between the car weight and the counterweight weight is as follows: W2 = W1 + β*CAP; when the elevator manufacturer actually designs, the counterweight weight W2 may also consider the weight of the accompanying cable, etc., which is very small relative to β*CAP, so it is simplified and not considered.

[0004] In the above formula, the coefficient β is called the balance coefficient. Elevator standards and national regulations have specific requirements for the balance coefficient. Article 4.3.8 of the current elevator standard GB / T 10058-2023 "Technical Conditions for Elevators" requires that "the balance coefficient of traction elevators should be within the range of 0.40 to 0.50." Article A1.3.2 of the current elevator inspection regulations TSG T7001-2023 "Rules for Elevator Supervision Inspection and Periodic Inspection" requires "balance coefficient test...confirm whether the balance coefficient is between 0.40 and 0.50 and meets the design value of the manufacturing (modification) unit...".

[0005] For ordinary elevators, the counterweight W2 is fixed. It is easy to think that when designing the elevator traction drive system, that is, when designing the drive device, control device, etc., it is necessary to consider the torque that the system can provide:

[0006] In the acceleration / deceleration stage: Maximum torque Mmax = torque required to overcome the weight difference between the car and the counterweight side + torque required for acceleration / deceleration (overcoming system inertia and friction);

[0007] In the uniform speed operation stage: rated torque M0 = torque required to overcome the weight difference between the car and the counterweight side;

[0008] Since the fixed weight difference between the car and the counterweight is β*CAP, and the variable weight value of the car is in the range of 0 to CAP, the "torque required to overcome the weight difference between the car and the counterweight" is a large value when designing the maximum torque Mmax. Especially for heavy-duty elevators, the influence of the weight difference is more prominent. Therefore, the system capacity of the drive device and control device of heavy-duty elevators on the market is very large, which is reflected in the huge size of the host and control cabinet, and its cost remains high. Summary of the invention

[0009] The technical problem to be solved by the present invention is how to provide a technical solution that can significantly reduce the system capacity of the drive device and the control device and increase the service life.

[0010] In order to solve the above technical problems, the present invention provides an elevator system, comprising a lifting passage, a car, a counterweight, a driving device, a traction rope and a control device; the car and the counterweight are connected by a traction rope; under the control of the control device, the driving device drives the car to move vertically along the lifting passage through the traction rope, and at the same time drives the counterweight to move vertically along the lifting passage and in the opposite direction relative to the car;

[0011] The elevator system includes a plurality of counterweights and a counterweight loading device; before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the counterweight or the car according to the load value in the car, so that the weight on the car side and the weight on the counterweight side are close to balance.

[0012] Preferably, the weight of the car is the same as the weight of the counterweight; before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the counterweight according to the load value in the car.

[0013] Preferably, the counterweight block has a horizontal through hole and is guided by a guide system; each counterweight block is stacked in the vertical direction; the counterweight block loading device is fixed on the counterweight and has a loading fork, and the weight of the counterweight block loaded on the counterweight is adjusted by inserting the loading fork into the through hole of the corresponding counterweight block.

[0014] Preferably, the weight of the counterweight is equal to the weight of the car plus the rated load of the elevator system; before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the car according to the load value in the car.

[0015] Preferably, the counterweight block has a horizontal through hole and is guided by a guide system; each counterweight block is stacked in the vertical direction; the counterweight block loading device is fixed on the car and has a loading fork, and the weight of the counterweight block loaded on the car is adjusted by inserting the loading fork into the through hole of the corresponding counterweight block.

[0016] Preferably, the counterweight weight is equal to the weight of the car plus half of the rated load capacity of the elevator system.

[0017] Preferably, the counterweight block has a horizontal through hole and is guided by a guide system; each counterweight block is stacked in the vertical direction; the counterweight block loading device includes a first counterweight block loading device and a second counterweight block loading device; the first counterweight block loading device is fixed to the car and has a loading fork, and the weight of the counterweight block loaded on the car is adjusted by inserting the loading fork into the through hole of the corresponding counterweight block; the second counterweight block loading device is fixed to the counterweight, and has a loading fork, and the weight of the counterweight block loaded on the counterweight is adjusted by inserting the loading fork into the through hole of the corresponding counterweight block.

[0018] Preferably, the elevator system further comprises a weighing device, and the weighing device is used to obtain a load value in the car.

[0019] The present invention also provides an elevator system, comprising a lifting passage, a first car, a second car, a driving device, a traction rope and a control device; the first car and the second car are connected by a traction rope; under the control of the control device, the driving device drives the first car to move vertically along the lifting passage through the traction rope, and drives the second car to move vertically along the lifting passage and in the opposite direction relative to the first car;

[0020] Characterized in that: the elevator system further comprises a plurality of counterweights and a counterweight loading device; the weight of the first car is equal to the weight of the second car;

[0021] Before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the first car or the second car according to the load values ​​in the first car and the second car, so that the weight on the first car side is close to the weight on the second car side.

[0022] Compared with the prior art, the present invention makes the weight on the car side and the counterweight side close to balance, achieving the following technical effects:

[0023] 1. The maximum torque required in the acceleration / deceleration stage of the elevator is significantly reduced, which reduces the system capacity and volume of the drive device and control device, further achieving cost reduction and efficiency improvement;

[0024] 2. The torque required during the uniform speed operation of the elevator approaches 0, so that the drive device and control device can be in a "resting" state for a long time, which is of great benefit to reducing the design difficulty, reducing operating failures and prolonging the service life of the elevator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0026] Figure 1 is a schematic diagram of a prior art elevator system;

[0027] Figure 2 Schematic diagram of an elevator system according to Embodiment 1 of the present invention;

[0028] Figure 3 Schematic diagram of an elevator system according to Embodiment 2 of the present invention;

[0029] Figure 4 Schematic diagram of an elevator system according to Embodiment 3 of the present invention;

[0030] Figure 5 Schematic diagram of an elevator system according to Embodiment 4 of the present invention;

[0031] Figure 6 This is a schematic diagram of the installation of a weighing device for an elevator system according to Embodiment 4 of the present invention;

[0032] Figure 7 This is a schematic diagram of a counterweight block of an elevator system according to Embodiment 5 of the present invention;

[0033] Figure 8 Schematic diagram of a guide shoe of a counterweight of an elevator system according to Embodiment 5 of the present invention;

[0034] Fig. 9 This is a schematic diagram of an elevator system according to Embodiment 6 of the present invention.

[0035] The accompanying drawings are described as follows:

[0036] 11 is the lifting passage; 12 is the machine room;

[0037] 21 is a car; 21a is a first car; 21b is a second car; 22 is a car side pulley; 23 is a counterweight; 24 is a counterweight side pulley; 25 is a counterweight block; 26 is a guide rail; 27 is a loading fork; 28 is a guide shoe;

[0038] 31 is a driving device; 32 is a guide wheel;

[0039] 41 is a traction rope; 42 is a compensation rope; 43 is a rope head on the car side; 44 is a rope head on the counterweight side;

[0040] 51 is a control device; 52 is a weighing device. DETAILED DESCRIPTION

[0041] The following describes the implementation methods of the present invention through specific specific embodiments, and those skilled in the art can fully understand other advantages and technical effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific implementation methods, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the overall design concept of the invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other in the absence of conflict. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art.

[0042] like Figure 1 The figure shows a schematic diagram of an elevator system in the prior art, which is the most commonly used traction elevator. In the elevator system, the car 21 and the counterweight 23 are arranged in the lifting passage 11, guided by the car guide rail and the counterweight guide rail respectively (not shown in this figure), and suspended by the traction rope 41 wound on the driving device 31, and moved vertically in opposite directions in the lifting passage 11 by the driving force of the driving device 31 arranged in the machine room 12. Compensation ropes 42 are suspended at the bottom of the car 21 and the counterweight 23 to compensate for the weight difference caused by the length change of the traction rope 41 on the car side and the counterweight side during the operation of the elevator. This figure shows the most common machine room elevator with a rope winding ratio i=2, in which a car side pulley 22 is arranged on the car 21, and a counterweight side pulley 24 is arranged on the counterweight 23. The traction rope 41 passes over the car side pulley 22 and the counterweight side pulley 24, and the two ends are fixed in the machine room 12 respectively, and are divided into the car side rope end and the counterweight side rope end according to the position. The operation of the elevator is controlled by the command of the control device 51.

[0043] In the prior art elevator system, the car weight is W1, the counterweight weight is W2, where W2 = W1 + β * CAP, and the balance coefficient β is in the range of 0.40 to 0.50. W1 and W2 are both fixed values. When designing the elevator traction drive system, that is, when designing the drive device, control device, etc., whether it is the acceleration / deceleration stage or the uniform speed operation stage, the torque provided by the system must consider the torque required to overcome the weight difference between the car and the counterweight side. The fixed weight difference between the car and the counterweight side is β * CAP, and the variable weight value range of the car side is 0 ~ CAP, resulting in the "torque required to overcome the weight difference between the car and the counterweight side" being a large value, especially for heavy-duty elevators, the impact of the weight difference is more prominent. Therefore, for heavy-duty elevators on the market, the system capacity of the drive device and the control device is very large, which is manifested in the huge size of the host and control cabinet, and its cost remains high.

[0044] Example 1

[0045] like Figure 2 As shown, it is a schematic diagram of Embodiment 1 of the present invention. In this embodiment, the weight of the car 21 is W1, and the weight of the counterweight 23 is W2, wherein W2=W1 in the initial state (for an empty car). W2 is a variable value. On the counterweight side of the landing station, a plurality of counterweights 25 are provided, and a counterweight loading device is provided. Before each elevator operation, the counterweight loading device increases or decreases the counterweight 25 on the counterweight side according to the load value in the car, that is, adjusts the weight of the counterweight loaded on the counterweight, so that the weight on the car side and the weight on the counterweight side are close to balance.

[0046] To simplify the discussion, in this embodiment, it is assumed that the compensation rope 42 is "perfectly compensated" for the traction rope 41, that is, the weight difference on the car side and the counterweight side caused by the length change of the traction rope 41 and the compensation rope 42 is not considered. The same applies to the subsequent embodiments.

[0047] The rated load capacity of the car 21 is CAP, and it can carry N passengers, assuming that each person has the same weight as CAP / N. In the initial state of the elevator, that is, when the car is empty, the weight of the car 21 is W1, and the weight of the counterweight 23 is W2=W1, and the weight of the car side and the counterweight side is balanced.

[0048] The car 21 carries one person, and the counterweight 23 is loaded with a counterweight block weighing CAP / N;

[0049] The car 21 carries two people, and the counterweight 23 is loaded with a counterweight block weighing 2*CAP / N;

[0050] …

[0051] The car 21 carries n persons, and the counterweight 23 is loaded with a counterweight block of weight n*CAP / N.

[0052] At any time when the elevator is running, the weight of the car side and the counterweight side are equal and balanced, that is, there is no weight difference between the car side and the counterweight side. Obviously, compared with the prior art, this embodiment has the following technical effects: first, the maximum torque value required in the acceleration / deceleration stage of the elevator is significantly reduced, so that the system capacity of the drive device and the control device is reduced, the volume is reduced, and cost reduction and efficiency improvement are further achieved; secondly, the torque required in the uniform speed operation stage of the elevator is close to 0, so that the drive device and the control device can be in a "resting" state for a long time, which is of great benefit to reducing the design difficulty, reducing operating failures, and increasing the service life of the elevator system.

[0053] In this embodiment, the weight W2 of the counterweight 23 is W2=W1 in the initial state, for the unloaded condition of the car. Considering the efficiency of the adjustment of the counterweight block 25, the elevator should operate in a low-load state most of the time. This embodiment is particularly suitable for use in scenes such as wind turbine working elevators, nuclear power plant working elevators, and hydropower station working elevators, with low frequency of use and few people per time; in addition, elevators in such scenes generally have the characteristics of a large lifting height and a small number of floor stations, most of which have only two top and bottom floor stations, which facilitates the setting and adjustment of the counterweight block 25.

[0054] Assume an elevator scenario with only two landings, the top and the bottom. People enter from the bottom landing, and the top landing is a working platform that can accommodate a maximum of M people. Before the elevator starts running, the working platform at the top landing is empty. Even if the working platform at the top landing is full of people, that is, M people are transported to the top landing by the elevator, the total number of counterweights 25 that need to be loaded on the counterweight 23 is M*CAP / N, and these counterweights are transported from the top landing to the bottom landing. After the operation is completed, all M people return to the bottom landing, and the above M*CAP / N counterweights 25 will be transported back to the top landing. Therefore, the total number of counterweights 25 required by the elevator system is M*CAP / N plus a certain margin.

[0055] Example 2

[0056] like Figure 3 As shown, it is a schematic diagram of Embodiment 2 of the present invention. For scenes such as TV towers and mountain sightseeing elevators, they generally have the characteristics of a large lifting height and a small number of floors, most of which have only two floors, the top and the bottom. However, such elevators are for tourists and operate at full load or close to full load most of the time.

[0057] In this embodiment, the weight of the car 21 is W1, and the weight of the counterweight 23 is W2, wherein W2=W1+CAP in the initial state (for a fully loaded car). W1 is a variable value, and a plurality of counterweights 25 are provided on the car side of the landing station, and a counterweight loading device is provided. Before each elevator operation, the counterweight loading device increases or decreases the counterweight on the car side according to the load value in the car, that is, adjusts the weight of the counterweight loaded on the car, so that the weight on the car side and the weight on the counterweight side are close to balance.

[0058] The rated load capacity of the car 21 is CAP, and it can carry N passengers, assuming that each person has the same weight as CAP / N. When the car is fully loaded, the weight of the car 21 is W1, and the weight of the counterweight 23 is W2=W1+CAP, and the weight of the car side and the counterweight side is balanced.

[0059] N persons are seated in the car 21, and the car 21 is not loaded with a counterweight;

[0060] Car 21 carries N-1 people, and car 21 is loaded with a counterweight weight of CAP / N;

[0061] Car 21 carries N-2 people, and car 21 is loaded with a counterweight weighing 2*CAP / N;

[0062] …

[0063] The car 21 carries n persons, and the car 21 is loaded with a counterweight weight (Nn)*CAP / N.

[0064] It can be seen that at any time when the elevator is running, the weights of the car side and the counterweight side are equal and balanced, that is, there is no weight difference between the car side and the counterweight side. Obviously, compared with the prior art, this embodiment also has the same technical effect as embodiment 1.

[0065] Example 3

[0066] like Figure 4 As shown, it is a schematic diagram of embodiment 3 of the present invention. In this embodiment, the weight of the car 21 is W1, and the weight of the counterweight 23 is W2, wherein W2=W1+0.5*CAP in the initial state, and such setting is the same as that of ordinary elevators in the prior art. Both W1 and W2 are variable values, and a plurality of counterweights 25 are respectively arranged on the car side and the counterweight side of the landing station, and a first counterweight loading device and a second counterweight loading device are arranged.

[0067] The counterweight loading device, before each elevator operation, the first counterweight loading device and the second counterweight loading device increase or decrease the counterweight on the car side or the counterweight side according to the load value in the car, that is, adjust the weight of the counterweight loaded on the counterweight or the car so that the weight on the car side and the weight on the counterweight side are close to balance.

[0068] The rated load capacity of the car 21 is CAP, and it can carry N passengers, assuming that each person weighs the same as CAP / N. According to the number of passengers n in the car 21, there are three cases:

[0069] Case 1: n<N / 2, that is, the load in the car<0.5*CAP

[0070] The car 21 is loaded with a counterweight, the weight of which is (N / 2-n)*CAP / N;

[0071] Case 2: n = N / 2, i.e. the car load is 0.5*CAP

[0072] Neither the car 21 nor the counterweight 23 is loaded with a counterweight block;

[0073] Case 3: n>N / 2, i.e., the car load>0.5*CAP

[0074] The counterweight 23 is loaded with a counterweight block, and the weight is (nN / 2)*CAP / N.

[0075] Figure 4The example shown is "Case 1: n<N / 2, i.e., the load in the car <0.5*CAP", so the counterweight is loaded in the car 21. It can be seen that at any time when the elevator is running, the weight on the car side and the counterweight side are equal and balanced, that is, there is no weight difference between the car side and the counterweight side. Obviously, compared with the prior art, this embodiment also has the same technical effect as embodiment 1. This embodiment is suitable for scenarios where the load in the car changes greatly, i.e., the number of passengers in the car 21 changes significantly.

[0076] The above embodiments 1 to 3 can be flexibly selected according to the use scenario of the elevator, so that the adjustment of the counterweight block 25 is convenient and fast, and there is always no weight difference between the car side and the counterweight side when the elevator is running.

[0077] Example 4

[0078] In this embodiment, based on the first embodiment, the elevator system further includes a weighing device 52, which is used to obtain the load value in the car. Figure 5 As shown, the two ends of the traction rope 41 are respectively fixed in the machine room 12, and are divided into a car side rope end 43 and a counterweight side rope end 44 according to their positions. The weighing device 52 is arranged at the car side rope end 43, as shown in FIG. Figure 6 As shown, it is a pressure sensor type weighing device, which converts the pressure change value at the rope head 43 on the car side into an electrical signal and transmits it to the control device 51, so as to obtain the load value in the car 21.

[0079] According to the load value in the car 21 obtained by the weighing device 52, under the command control of the control device 51, the number of counterweight blocks 25 to be increased or decreased is determined, and the adjustment operation is performed by the counterweight block loading device set in the elevator system.

[0080] This embodiment shows a rope end pressure sensor weighing method which is currently commonly used in elevators. The weighing device 52 can also be a differential transformer, a Hall sensor, a wire rope tension detection and other methods.

[0081] Example 5

[0082] like Figure 7 , Figure 8 FIG. 5 is a schematic diagram of Embodiment 5 of the present invention. In the previous embodiments, the counterweight 25 can be loaded on the frame structure of the car 21 and the counterweight 23, and when the elevator is running, the counterweight 25 moves vertically with the car 21 and the counterweight 23. In this embodiment, the counterweight 25 is placed in a certain number and has an independent guide system, and the loaded counterweight 25 moves vertically with the car 21 and the counterweight 23.

[0083] like Figure 7As shown, independent of the car 21 guided by the car guide rail and the counterweight 23 guided by the counterweight guide rail, the counterweights 25 are stacked in a certain number and guided by independent guide rails 26. Guide shoes 28 are provided at the contact point between the counterweight 25 and the guide rail 26 to reduce friction resistance and reduce operating noise. The loading fork 27 is a part of the counterweight loading device on the car side or the counterweight side. According to the command control of the control device 51, it is inserted into the hole of the corresponding counterweight 25, thereby driving the corresponding number of counterweights 25 to move vertically with the car 21 and the counterweight 23.

[0084] The above operation of the loading fork 27 is completed automatically under the command control of the control device 51. The working speed should be as fast as possible, and the adjustment of the counterweight block 25 should be completed in a short time after the car 21 completes the entry and exit of passengers and the loading and unloading of goods at the landing station, without affecting the elevator operation efficiency.

[0085] like Figure 8 As shown, the guide shoe 28 of this embodiment is a sliding guide shoe. According to the specifications of the elevator and the usage scenario, the guide shoe 28 can also be a roller guide shoe or other types.

[0086] Example 6

[0087] like Fig. 9 , which is a schematic diagram of Embodiment 6 of the present invention. In this embodiment, both sides of the driving device 31 are suspended by the traction rope 41, which are the first car 21a and the second car 21b. Under the control of the control device 51, the driving device 31 drives the first car 21a to move vertically along the lifting channel 11 through the traction rope 41, and drives the second car 21b to move vertically along the lifting channel 11 and in the opposite direction relative to the first car 21a.

[0088] Here, it is assumed that the first car and the second car are the same, and the rated load capacity is also the same. The weight of the first car 21a is W1, and the weight of the second car 21b is also W1. The weights of the first car 21a and the second car 21b are both variable values. A number of counterweights 25 are respectively provided on the first car 21a side and the second car 21b side of the floor station, and a counterweight loading device is provided. Before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the first car or the second car according to the load value in the first car and the second car, so that the weight on the first car side is close to the weight on the second car side. Balance.

[0089] The rated load of the first car 21a and the second car 21b are both CAP, which can carry N passengers. Assume that the weight of each person is equal to CAP / N. At a certain moment before the elevator is about to run, the number of passengers in the first car 21a is n1, and the number of passengers in the second car 21b is n2. There are three situations:

[0090] Case 1: n1<n2, that is, the number of people in the first car 21a is less than that in the second car 21b

[0091] The first car 21a is loaded with a counterweight, the weight of which is (n2-n1)*CAP / N;

[0092] Case 2: n1=n2, that is, the number of people in the first car 21a and the second car 21b is the same

[0093] Neither the first car 21a nor the second car 21b is loaded with a counterweight;

[0094] Case 3: n1>n2, that is, the number of passengers in the first car 21a is greater than that in the second car 21b

[0095] The second car 21b is loaded with a counterweight having a weight of (n1-n2)*CAP / N.

[0096] Fig. 9 It shows "Case 1: n1<n2, that is, the number of people in the first car 21a is less than that in the second car 21b", so a counterweight is loaded in the first car 21a. It can be seen that at any time when the elevator is running, the weight of the first car and the second car are equal and balanced, that is to say, there is no weight difference between the first car and the second car. Obviously, compared with the prior art, this embodiment also has the same technical effect as embodiment 1; further, for scenes such as scenic spots, the flow of people going up and down by elevator is not possible. In this embodiment, there are cars on both sides, which can transport passengers separately, which has the effect of using one elevator as two, further improving the elevator capacity.

[0097] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. An elevator system, comprising a lifting passage, a car, a counterweight, a driving device, a traction rope and a control device; the car and the counterweight are connected by a traction rope; under the control of the control device, the driving device drives the car to move vertically along the lifting passage through the traction rope, and drives the counterweight to move vertically along the lifting passage and in the opposite direction relative to the car; Features: The elevator system includes a plurality of counterweights and a counterweight loading device; before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the counterweight or the car according to the load value in the car, so that the weight on the car side and the weight on the counterweight side are close to balance.

2. The elevator system according to claim 1, characterized in that The weight of the car is the same as the weight of the counterweight; before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the counterweight according to the load value in the car.

3. The elevator system according to claim 2, characterized in that The counterweight block has a horizontal through hole and is guided by a guide system; each counterweight block is stacked in the vertical direction; the counterweight block loading device is fixed on the counterweight and has a loading fork, and the weight of the counterweight block loaded on the counterweight is adjusted by inserting the loading fork into the through hole of the corresponding counterweight block.

4. The elevator system according to claim 1, characterized in that The weight of the counterweight is equal to the weight of the car plus the rated load of the elevator system; before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the car according to the load value in the car.

5. The elevator system according to claim 4, characterized in that The counterweight block has a horizontal through hole and is guided by a guide system; each counterweight block is stacked in the vertical direction; the counterweight block loading device is fixed on the car and has a loading fork, and the weight of the counterweight block loaded on the car is adjusted by inserting the loading fork into the through hole of the corresponding counterweight block.

6. The elevator system according to claim 1, characterized in that The counterweight weight is equal to the weight of the car plus half of the rated load capacity of the elevator system.

7. The elevator system according to claim 6, characterized in that The counterweight block has a horizontal through hole and is guided by a guide system; each counterweight block is stacked in a vertical direction; the counterweight block loading device includes a first counterweight block loading device and a second counterweight block loading device; The first counterweight loading device is fixed on the car and has a loading fork, and the weight of the counterweight loaded on the car is adjusted by inserting the loading fork into the through hole of the corresponding counterweight; The second counterweight loading device is fixed on the counterweight and has a loading fork, and the weight of the counterweight loaded on the counterweight is adjusted by inserting the loading fork into the through hole of the corresponding counterweight.

8. The elevator system according to claim 1, characterized in that The elevator system further comprises a weighing device, and the weighing device is used to obtain a load value in the car.

9. An elevator system, comprising: A lifting channel, a first car, a second car, a driving device, a traction rope and a control device; The first car and the second car are connected by a traction rope; under the control of the control device, the driving device drives the first car to move vertically along the lifting passage through the traction rope, and drives the second car to move vertically along the lifting passage and in the opposite direction relative to the first car; Characterized in that: the elevator system also includes a plurality of counterweights and a counterweight loading device; the weight of the first car is equal to the weight of the second car; before each operation of the elevator system, the counterweight loading device adjusts the weight of the counterweight loaded on the first car or the second car according to the load values ​​in the first car and the second car, so that the weight on the first car side is close to the weight on the second car side.

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