CN107176520B - A kind of the no-load measuring device and method of balance coefficient of elevator - Google Patents

Abstract

The invention relates to a no-load measuring device for elevator balance coefficient. The invention solves the problems of time-consuming and labor-intensive detection of the elevator balance coefficient, high cost, no consideration of system resistance and inconvenient installation in the prior art. The device includes a detection end and a control end, the detection end includes a difference detection unit and a lifting unit, the control end includes an operation unit and a wireless receiving unit, and the operation unit includes a processing unit and a display unit. The present invention calculates the elevator balance coefficient by detecting the weight difference between the car side and the counterweight side. Compared with the method of measuring the weight difference between the counterweight and the car at the same horizontal position, the device is more convenient for measurement. At the same time, the influence of system resistance is removed.

Description

No-load measuring device and method for elevator balance coefficient

technical field

The invention relates to the technical field of elevators, in particular to a no-load measuring device and method for elevator balance coefficients.

Background technique

As of the end of 2016, there were nearly 5 million elevators in my country. At present, more than 500,000 elevators are added every year, making it the largest elevator manufacturing base and elevator market in the world. The measurement of the balance coefficient is an important part of the elevator inspection. The TSG T7001-2009 Amendment No. 2 (draft for comments) implemented on July 1, 2016 puts forward higher requirements for the detection of the elevator balance coefficient, especially the No-load measurement of elevator balance factor.

The current elevator technical standards and elevator inspection rules adopt the test method as follows: the car is loaded with 30%, 40%, 45%, 50%, and 60% of the rated load for the whole journey up and down, when the car and the counterweight run When reaching the same horizontal position, record the current value, draw the current-load curve, and determine the balance coefficient at the intersection point of the upper and lower operating curves. During the application of this method, weights need to be moved, and the inspection is time-consuming, laborious and costly.

In recent years, more and more attention has been paid to the research on no-load test technology of balance coefficient. The weighing method is an important part of no-load test elevator balance coefficient because of its high reliability and good economy. It mainly includes the following two types: 1. Shenzhen Jingshizhiyong Technology Co., Ltd. implements the detection according to the "weighing method", and uses the German LSM1 balance coefficient detector to test each of the two sides of the traction sheave under the condition of no-load stop. The tension of the traction rope is summarized to obtain the total weight of the car and the total weight of the counterweight, based on which the value of the balance coefficient is calculated and a test report is issued. 2. The weighing method introduced by a company in Dalian places the weighing sensor above the counterweight buffer. When the brake is released, the elevator balance coefficient is obtained through the value of the sensor and the rated parameters of the elevator car.

The no-load test technology of elevator balance coefficient has been developed for more than ten years. The above-mentioned methods have a wide range of influences, but there are certain limitations: a) The corresponding detection instruments introduced, the detection accuracy indicators are not clear or have not been measured Verification, has not been recognized by the industry, such as the above methods 1 and 2 do not consider the influence of system resistance on measurement accuracy. b) The force measuring, weighing and other testing devices used are not convenient to install on the testing site. For example, method 1 is not suitable for elevators with compact hosts, nor for machine room-less elevators.

Contents of the invention

The invention mainly solves the problems of time-consuming, laborious, high cost, no consideration of system resistance and inconvenient installation in the detection of the elevator balance coefficient in the prior art, and provides a no-load measuring device and method for the elevator balance coefficient.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: a no-load measuring device for elevator balance coefficient, which includes a detection terminal and a control terminal, and the detection terminal includes measuring the weight difference between the car side and the counterweight side. The detected difference detection unit, the lifting unit that lifts and lowers the counterweight, the wireless transmitting unit is connected to the difference detecting end, the control end includes the operation unit and the wireless receiving unit, and the operation unit includes the processing of calculating the elevator balance coefficient according to the detection difference The unit and the display unit, the display unit is connected to the processing unit, the processing unit is connected to the wireless receiving unit, and the wireless receiving unit is connected to the wireless transmitting unit through a wireless network. In the present invention, the counterweight is raised and lowered at a uniform speed by the lifting unit, and the weight difference between the car side and the counterweight side is respectively detected by the difference detection unit during the process of rising and lowering at a constant speed. The detection end sends the detected data to the control end through the wireless transmitting unit, and the control end is received by the wireless receiving unit and then sent to the processing unit for processing. The corresponding elevator balance coefficient technical method is preset in the processing unit, and the corresponding elevator balance coefficient is calculated according to the detected difference. The invention calculates the balance coefficient of the elevator by detecting the difference between the car side and the counterweight side. Compared with the method of measuring the weight difference between the counterweight and the car at the same horizontal position, the device is more convenient for measurement, and at the same time The influence of system resistance is removed.

As a preferred solution, the device is installed on one side of the counterweight of the hoistway, the lifting unit is installed on the center of the counterweight buffer in the bottom pit of the hoistway, and the difference detection unit is installed on the lifting unit. This solution is used to lift and lower the counterweight to obtain the weight difference between the car side and the counterweight side.

As a preferred solution, the difference detection unit is a pressure sensor or a load cell, and the lifting unit is a hydraulic device or a cylinder device.

A no-load measurement method of an elevator balance factor, comprising the following steps:

S1. Run the counterweight to the position of the detection device, and bring the difference detection unit into contact with the counterweight through the lifting unit;

S2. Push the counterweight to move upward at a uniform speed by controlling the lifting device. When the value is stable, obtain the weight difference Ws between the car side and the counterweight side under the state of moving upward at a constant speed, and control the lifting device to push the counterweight to move downward at a constant speed. When the value is stable , obtain the weight difference Wx between the car side and the counterweight side under the state of uniform downward movement; the scheme of the present invention measures in the pit of the hoistway, and drives the counterweight to move up and down to reduce the influence of system resistance.

S3. Calculate other influencing factors E respectively according to whether there is a compensation chain in the elevator;

S4. The control difference detection unit is separated from the counterweight. When the car is empty or loaded, the processing unit calculates the elevator balance coefficient K according to the data obtained in steps S2 and S3.

As a preferred solution, the specific process of step S1 includes:

S11. Run the elevator car to the top floor, run the counterweight to the top of the device, and lock the elevator;

S12. Control the lifting unit to raise the difference detection unit until the upper surface of the difference detection unit contacts the counterweight, and control the elevator to release the brake.

As a preferred solution, the process of calculating other influencing factors E in step S3 includes:

S31. The lifting unit stops working. If there is no compensation chain, obtain the distance H between the pit and the bottom of the car, the weight ρ ₁ of the wire rope per meter, the number n of wire ropes, and the traction ratio y;

S32. Calculate other influencing factors of the elevator without compensation chain E=-y*n*ρ ₁ *H;

S33. If there is a compensation chain, other influencing factors E=0.

As a preferred solution, the calculation process of the elevator balance coefficient in step S4 includes:

When the car is empty, the balance coefficient of the elevator is:

Where Q is the rated load of the car;

In the case of car load, the elevator balance coefficient is:

where m is the weight of the load.

Therefore, the advantage of the present invention is: by detecting the difference between the car side and the counterweight side to calculate the elevator balance coefficient, compared with the method of measuring the weight difference between the counterweight and the car at the same horizontal position, the present invention The device is more convenient for measurement, and at the same time removes the influence of system resistance. Simple structure, more convenient to install in operation now.

Description of drawings

Accompanying drawing 1 is a kind of structural representation of the present invention.

1-Difference detection unit 2-Elevating unit 3-Wireless transmitting unit 4-Wireless receiving unit 5-Operation unit 6-Processing unit 7-Display unit 8-Counterweight 9-Counterweight buffer.

Detailed ways

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Example:

The no-load measuring device of a kind of elevator balance coefficient of this embodiment, as shown in Figure 1, comprises detection terminal and control terminal, and detection terminal comprises the difference detection unit 1 that detects the weight difference of car side and counterweight side, The lifting unit 2 that lifts and lowers the counterweight 8 has a wireless transmitting unit 3 connected to the difference detection end, the control end includes an operation unit 5 and a wireless receiving unit 4, and the operation unit includes a processing unit 6 that calculates the balance coefficient of the elevator based on the detected difference and the display unit 7, the display unit is connected to the processing unit, the processing unit is connected to the wireless receiving unit, and the wireless receiving unit is connected to the wireless transmitting unit through a wireless network.

The device is installed on one side of the counterweight of the hoistway, the lifting unit is installed on the center of the counterweight buffer 9 in the bottom pit of the hoistway, and the difference detection unit is installed on the lifting unit. The difference detection unit is a pressure sensor or a load cell, and the lifting unit is a hydraulic device or a cylinder device.

A no-load measurement method of an elevator balance factor, comprising the following steps:

S1. Run the counterweight to the position of the detection device, and contact the difference detection unit with the counterweight through the lifting unit; the specific process includes:

S11. Run the elevator car to the top floor, run the counterweight to the top of the device, and lock the elevator;

S12. Control the lifting unit to raise the difference detection unit until the upper surface of the difference detection unit contacts the counterweight, and control the elevator to release the brake.

S2. Push the counterweight to move upward at a uniform speed by controlling the lifting device. When the value is stable, obtain the weight difference Ws between the car side and the counterweight side under the state of moving upward at a constant speed, and control the lifting device to push the counterweight to move downward at a constant speed. When the value is stable , obtain the weight difference Wx between the car side and the counterweight side under the state of uniform downward motion;

S3. Calculate other influencing factors E according to whether there is a compensation chain in the elevator; the calculation process of other influencing factors E includes:

S31. The lifting unit stops working. If there is no compensation chain, obtain the distance H between the pit and the bottom of the car, the weight ρ ₁ of the wire rope per meter, the number n of wire ropes, and the traction ratio y;

S32. Calculate other influencing factors of the elevator without compensation chain E=-y*n*ρ ₁ *H;

S33. If there is a compensation chain, other influencing factors E=0.

S4. The control difference detection unit is separated from the counterweight. When the car is empty or loaded, the processing unit calculates the elevator balance coefficient K according to the data obtained in steps S2 and S3. The calculation process includes:

When the car is empty, the balance coefficient of the elevator is:

Where Q is the rated load of the car;

In the case of car load, the elevator balance coefficient is:

where m is the weight of the load.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although terms such as difference detection unit, lifting unit, wireless transmitting unit, and wireless receiving unit are frequently used in this paper, the possibility of using other terms is not excluded. These terms are used only for the purpose of describing and explaining the essence of the present invention more conveniently; interpreting them as any kind of additional limitation is against the spirit of the present invention.

Claims (6)

1. A no-load measuring device for an elevator balance factor, characterized in that: it includes a detection end and a control end, and the detection end includes a difference detection unit that detects the weight difference between the car side and the counterweight side, and the counterweight For the lifting unit, the difference detection end is connected with a wireless transmitting unit, the control end includes an operation unit and a wireless receiving unit, the operation unit includes a processing unit and a display unit for calculating the elevator balance coefficient according to the detection difference, and the display unit is connected to the processing unit , the processing unit is connected to the wireless receiving unit, and the wireless receiving unit is connected to the wireless transmitting unit through a wireless network; the device is installed on the counterweight side of the hoistway, the lifting unit is installed on the center of the counterweight buffer in the pit of the hoistway, and the difference detection unit Mounted on lifting unit. 2. A no-load measuring device for elevator balance coefficient according to claim 1, characterized in that said difference detection unit is a pressure sensor or a load cell, and said lifting unit is a hydraulic device or a cylinder device. 3. A no-load measuring method of elevator balance factor, adopting the no-load measuring device in claim 1 or 2, is characterized in that: comprise the following steps: S1. Run the counterweight to the position of the no-load measuring device, and contact the difference detection unit with the counterweight through the lifting unit; S2. By controlling the lifting unit to push the counterweight to move upward at a uniform speed, when the value is stable, obtain the weight difference Ws between the car side and the counterweight side under the state of constant upward movement, and control the lifting unit to push the counterweight to move downward at a constant speed until the value is stable , obtain the weight difference Wx between the car side and the counterweight side under the state of uniform downward motion; S3. Calculate other influencing factors E respectively according to whether there is a compensation chain in the elevator; S4. The control difference detection unit is separated from the counterweight. When the car is empty or loaded, the processing unit calculates the elevator balance coefficient K according to the data obtained in steps S2 and S3. 4. the no-load measuring method of a kind of elevator balance coefficient according to claim 3 is characterized in that the concrete process of step S1 comprises: S11. Run the elevator car to the top floor, run the counterweight to the top of the no-load measuring device, and lock the elevator; S12. Control the lifting unit to raise the difference detection unit until the upper surface of the difference detection unit contacts the counterweight, and control the elevator to release the brake. 5. the no-load measuring method of a kind of elevator balance factor according to claim 3 is characterized in that the calculation process of calculating other influencing factors E in the step S3 comprises: S31. The lifting unit stops working. If there is no compensation chain, obtain the distance H between the pit and the bottom of the car, the weight ρ ₁ of the wire rope per meter, the number n of wire ropes, and the traction ratio y; S32. Calculate other influencing factors E=-yn*ρ ₁ *H of the elevator without compensation chain; S33. If there is a compensation chain, other influencing factors E=0. 6. the no-load measuring method of a kind of elevator balance coefficient according to claim 3 or 5, is characterized in that the calculation process of elevator balance coefficient among the step S4 comprises: When the car is empty, the balance coefficient of the elevator is: Where Q is the rated load of the car; In the case of car load, the elevator balance coefficient is: where m is the weight of the load.