Elevator traction testing machine based on crank sliding block

Abstract

The elevator traction testing machine comprises a base, a carbon fiber belt and a sliding rod, the middle of the base is provided with a first support, the first support is rotatably provided with an experiment wheel through a rotating shaft, and the positions, located on the two sides of the first support, of the base are provided with a second support and a third support respectively; a first guide wheel is rotationally mounted on the second bracket through a rotating shaft, and a second guide wheel is rotationally mounted on the third bracket through a rotating shaft; a sliding block is installed on the sliding rod in a sliding mode, after the carbon fiber belt is arranged on the first guide wheel and the second guide wheel in a sleeving mode, the two ends of the carbon fiber belt are fixed to the two ends of the sliding block, the middle of the bottom end of the carbon fiber belt is supported through a test wheel, a fourth support is installed on the base, and a driving assembly is installed on the fourth support. The driving assembly drives the sliding block to reciprocate through the crank assembly. According to the invention, by means of the slider-crank mechanism, the motion rule of the carbon fiber belt is in a complete sine curve and has no quick-return characteristic, so that sudden change of the motion speed is avoided.

Description

Technical Field

[0001] This invention relates to the field of elevator traction testing machine technology, specifically an elevator traction testing machine based on a crank-slider. Background Technology

[0002] During operation, traction elevators experience uneven tension in the traction ropes on either side of the traction sheave, leading to creep and slight slippage. This slippage and creep are significant causes of wear on the traction ropes and sheave. After a period of operation, varying degrees of wear will occur in the traction ropes and the grooves on the traction sheave that come into contact with them. As wear intensifies, the diameter of the traction ropes decreases, altering the traction capacity of the traction system and causing car vibrations. This negatively impacts elevator safety and comfort, necessitating the replacement of the traction ropes or sheave.

[0003] Existing elevator traction testing machines suffer from the following problems: unstable motion patterns, exhibiting quick-return characteristics or rigid impacts, leading to abrupt changes in speed and tension during testing, affecting the accuracy and repeatability of test data; and the inability to achieve a perfectly sinusoidal motion trajectory, resulting in poor adaptability to actual elevator traction conditions and limited reference value of test results. Therefore, we propose an elevator traction testing machine based on a crank-slider design. Summary of the Invention

[0004] The purpose of this invention is to provide an elevator traction testing machine based on a crank-slider to solve the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an elevator traction testing machine based on a crank-slider, comprising a base, a carbon fiber belt, and a slide rod. A first support is mounted in the middle of the base, and a test wheel is rotatably mounted on the first support via a rotating shaft. A second support and a third support are respectively mounted on both sides of the base on the first support. A first guide wheel is rotatably mounted on the second support via a rotating shaft, and a second guide wheel is rotatably mounted on the third support via a rotating shaft. A slider is slidably mounted on the slide rod. After the carbon fiber belt is sleeved on the first and second guide wheels, both ends of the carbon fiber belt are fixed to both ends of the slider. The middle of the bottom end of the carbon fiber belt is supported by the test wheel. A fourth support is mounted on the base. The fourth bracket is equipped with a drive assembly, which drives the slider to reciprocate via a crank assembly. After the drive assembly (e.g., a motor) on the fourth bracket starts, it outputs rotational power to the first crank connecting rod of the crank assembly. The first crank connecting rod rotates around the output shaft of the drive assembly, driving the second crank connecting rod to perform planar motion via a pin, converting the rotational motion into linear reciprocating motion. The second crank connecting rod is rotatably connected to one side of the slider via a pin, causing the slider to slide precisely along two parallel sliding rods. The parallel design of the sliding rods ensures the stability of the slider's trajectory. A carbon fiber belt is fixed at both ends to the sides of the slider and supported in the middle by a test wheel, while simultaneously fitted onto the first and second guide wheels of the same size and height. When the slider reciprocates, it pulls the carbon fiber belt to reciprocate synchronously along the guide wheels and the test wheel. The grooved design ensures the carbon fiber belt does not shift or fall off. The reciprocating motion of the carbon fiber belt simulates elevator traction conditions. The contact and engagement between the test wheel and the carbon fiber belt allows for the completion of elevator traction-related performance tests.

[0006] Preferably, the crank assembly includes a first crank connecting rod and a second crank connecting rod. One end of the first crank connecting rod is connected to the output shaft of the drive assembly, and the other end of the first crank connecting rod is rotatably connected to one end of the second crank connecting rod via a pin. The other end of the second crank connecting rod is rotatably connected to one side of the slider via a pin.

[0007] Preferably, the base is equipped with a slide bar bracket, and the slide bar bracket is equipped with two parallel slide bars.

[0008] Preferably, the first guide wheel and the second guide wheel are of the same size and are located at the same height.

[0009] Preferably, the experimental wheel, the first guide wheel, and the second guide wheel are all provided with grooves that cooperate with the carbon fiber belt.

[0010] The experimental method includes the following steps:

[0011] S1. Check the fit between the carbon fiber belt and the test wheel, the first guide wheel, and the second guide wheel to ensure there is no offset; confirm that the slider slides smoothly on the two parallel slide rods without jamming; check the pin connection between the crank assembly (first crank connecting rod, second crank connecting rod) and the drive assembly and the slider to ensure flexible rotation without jamming.

[0012] S2. Based on the actual testing requirements of the elevator traction system, set the output parameters of the drive components and specify the test duration and reciprocating motion frequency;

[0013] S3. Start the drive assembly on the fourth bracket. Power is transmitted through the first crank connecting rod and the second crank connecting rod, causing the slider to reciprocate along the sliding rod.

[0014] S4. Observe the movement of the carbon fiber belt along the first guide wheel, the second guide wheel and the test wheel under the traction of the slider, and ensure that the belt does not fall off or shift and that the tension is stable.

[0015] S5. Collect data such as tension changes, displacement, and velocity curves of the carbon fiber belt, and record key parameters during the test. If it is necessary to test the traction performance under different working conditions, the parameters of the drive component can be adjusted, and steps 2-4 can be repeated to collect multiple sets of experimental data.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. Relying on the crank-slider mechanism, the carbon fiber belt's motion follows a perfectly sinusoidal curve, without any sudden return characteristics, thus avoiding abrupt changes in speed. There is no rigid impact, reducing wear and tear on the mechanism, extending equipment lifespan, while ensuring a smooth testing process and high repeatability of test data.

[0018] 2. The symmetrical layout of the guide wheels (identical in size and height) and the grooved design ensures uniform force distribution on the carbon fiber belt, preventing deviation and maintaining stable tension during movement. The double parallel slide bar structure, in conjunction with the slider, improves the slider's sliding accuracy, indirectly guaranteeing the accuracy of the carbon fiber belt's trajectory. All components are connected via brackets, shafts, and pins, resulting in a clear assembly logic, a compact overall structure, and ease of installation, debugging, and maintenance.

[0019] 3. The carbon fiber belt precisely matches the grooves of the test wheel and guide wheel, and the belt length remains constant, perfectly matching the actual working conditions of the elevator traction system, resulting in highly valuable test results. The component selection and connection method balance stability and load-bearing capacity, adapting to the testing requirements of different elevator traction specifications, and has a wide range of applications.

[0020] 4. The transmission methods of each moving part (crank connecting rod, slider, guide wheel, etc.) are simple, with few points of failure and high operational reliability. The structure is highly modular, and the parts are easy to disassemble and assemble. Subsequent maintenance does not require complicated operations, which can reduce maintenance costs and time costs. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the present invention when the slider is in the middle and the connecting rod is below;

[0024] Figure 3 This is a schematic diagram of the structure of the present invention when the slider is in the middle and the connecting rod is at the top;

[0025] Figure 4 This is a motion law diagram of the present invention.

[0026] In the diagram: 1. Base; 2. First support; 3. Test wheel; 4. Second support; 5. First guide wheel; 6. Third support; 7. Second guide wheel; 8. Carbon fiber belt; 9. Fourth support; 10. First crank connecting rod; 11. Second crank connecting rod; 12. Slider; 13. Sliding rod. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0028] Please see Figure 1-4In this embodiment of the invention, an elevator traction testing machine based on a crank-slider includes a base 1, a carbon fiber belt 8, and a slide bar 13. A first support 2 is mounted in the middle of the base 1, and a test wheel is rotatably mounted on the first support 2 via a rotating shaft. A second support 4 and a third support 6 are respectively mounted on either side of the first support 2 on the base 1. A first guide wheel 5 is rotatably mounted on the second support 4 via a rotating shaft, and a second guide wheel 7 is rotatably mounted on the third support 6 via a rotating shaft. A slider 12 is slidably mounted on the slide bar 13. After the carbon fiber belt 8 is fitted onto the first guide wheel 5 and the second guide wheel 7, both ends of the carbon fiber belt 8 are fixed to both ends of the slider 12. The middle of the bottom end of the carbon fiber belt 8 is supported by the test wheel 3. The base 1 is equipped with a first support 4 and a third support 6. The fourth support 9 is equipped with a drive assembly, which drives the slider 12 to reciprocate via a crank assembly. After the drive assembly on the fourth support 9 is started, it outputs rotational power to the first crank connecting rod 10 of the crank assembly. The first crank connecting rod 10 rotates around the output shaft of the drive assembly, and drives the second crank connecting rod 11 to perform planar motion through a pin, converting the rotational motion into linear reciprocating motion. The second crank connecting rod 11 is rotatably connected to one side of the slider 12 through a pin, driving the slider 12 to perform precise reciprocating sliding along two parallel sliding rods 13 on the sliding rod support. The carbon fiber belt 8 is fixed at both ends to both sides of the slider 12, supported in the middle by the test wheel 3, and simultaneously fitted onto the first guide wheel 5 of the second support 4 and the second guide wheel 7 of the third support 6. When the slider 12 slides back and forth, the traction carbon fiber belt 8 moves synchronously back and forth along the two guide wheels and the test wheel 3. The grooved design of the guide wheels and the test wheel ensures that the carbon fiber belt 8 does not deviate or fall off. The reciprocating motion of the carbon fiber belt 8 simulates the elevator traction working condition. The contact and cooperation between the test wheel 3 and the carbon fiber belt 8, together with the support and fixation of the first bracket 2, completes the relevant performance test of elevator traction.

[0029] The crank assembly includes a first crank connecting rod 10 and a second crank connecting rod 11. One end of the first crank connecting rod 10 is connected to the output shaft of the drive assembly. The other end of the first crank connecting rod 10 is rotatably connected to one end of the second crank connecting rod 11 via a pin. The other end of the second crank connecting rod 11 is rotatably connected to one side of the slider 12 via a pin.

[0030] The base 1 is equipped with a slide rod 13 bracket, and the slide rod 13 bracket is equipped with two parallel slide rods 13.

[0031] The first guide wheel 5 and the second guide wheel 7 are the same size and are located at the same height; the experimental wheel, the first guide wheel 5 and the second guide wheel 7 are all provided with grooves that cooperate with the carbon fiber belt 8.

[0032] The experimental method includes the following steps:

[0033] S1. Check the groove fit of the carbon fiber belt 8 with the test wheel 3, the first guide wheel 5, and the second guide wheel 7 to ensure no offset; confirm that the slider 12 slides smoothly on the two parallel slide rods 13 without jamming; check the pin connection between the crank assembly (first crank connecting rod 10, second crank connecting rod 11) and the drive assembly and slider 12 to ensure flexible rotation without jamming.

[0034] S2. Based on the actual testing requirements of the elevator traction system, set the output parameters of the drive components and specify the test duration and reciprocating motion frequency;

[0035] S3. Start the drive assembly on the fourth bracket 9. Power is transmitted through the first crank connecting rod 10 and the second crank connecting rod 11, causing the slider 12 to slide back and forth along the slider 13.

[0036] S4. Observe the movement of the carbon fiber belt 8 along the first guide wheel 5, the second guide wheel 7 and the test wheel 3 under the traction of the slider 12, and ensure that the belt does not fall off or deviate and that the tension is stable.

[0037] S5. Collect data such as tension change, displacement, and velocity curve of carbon fiber belt 8, and record key parameters during the test. If it is necessary to test the traction performance under different working conditions, the parameters of the drive component can be adjusted, and steps 2-4 can be repeated to collect multiple sets of experimental data.

[0038] The working principle of this invention is as follows: After the drive assembly on the fourth bracket 9 is started, it outputs rotational power to the first crank connecting rod 10 of the crank assembly; the first crank connecting rod 10 rotates around the output shaft of the drive assembly, and drives the second crank connecting rod 11 to perform planar motion through the pin, converting the rotational motion into linear reciprocating motion; the second crank connecting rod 11 is rotatably connected to one side of the slider 12 through the pin, driving the slider 12 to perform precise reciprocating sliding along the two parallel sliders 13 on the slider bracket; the two ends of the carbon fiber belt 8 are fixed to both sides of the slider 12, and the middle is supported by the test wheel 3, and is simultaneously fitted on the first guide wheel 5 of the second bracket 4 and the second guide wheel 7 of the third bracket 6. When the slider 12 reciprocates, it pulls the carbon fiber belt 8 to perform synchronous reciprocating motion along the two guide wheels and the test wheel 3, and the grooved design of the guide wheels and the test wheel ensures that the carbon fiber belt 8 does not deviate or fall off; the reciprocating motion of the carbon fiber belt 8 simulates the elevator traction condition, and the contact and cooperation between the test wheel 3 and the carbon fiber belt 8, together with the support and fixation of the first bracket 2, completes the relevant performance test of elevator traction.

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An elevator traction testing machine based on a crank-slider, comprising a base (1), a carbon fiber belt (8), and a slide bar (13), characterized in that: A first bracket (2) is installed in the middle of the base (1). The first bracket (2) is rotatably mounted with an experimental wheel via a rotating shaft. A second bracket (4) and a third bracket (6) are respectively installed on both sides of the base (1) of the first bracket (2). The second bracket (4) is rotatably mounted with a first guide wheel (5) via a rotating shaft. The third bracket (6) is rotatably mounted with a second guide wheel (7) via a rotating shaft. A slider (12) is slidably mounted on the slide rod (13). After the carbon fiber belt (8) is sleeved on the first guide wheel (5) and the second guide wheel (7), the two ends of the carbon fiber belt (8) are fixed to the two ends of the slider (12). The middle part of the bottom end of the carbon fiber belt (8) is supported by the experimental wheel (3). A fourth bracket (9) is installed on the base (1). A drive assembly is installed on the fourth bracket (9). The drive assembly drives the slider (12) to move back and forth via a crank assembly.

2. The elevator traction testing machine based on a crank-slider as described in claim 1, characterized in that: The crank assembly includes a first crank connecting rod (10) and a second crank connecting rod (11). One end of the first crank connecting rod (10) is connected to the output shaft of the drive assembly. The other end of the first crank connecting rod (10) is rotatably connected to one end of the second crank connecting rod (11) via a pin. The other end of the second crank connecting rod (11) is rotatably connected to one side of the slider (12) via a pin.

3. The elevator traction testing machine based on a crank-slider as described in claim 1, characterized in that: The base (1) is equipped with a slide rod (13) bracket, and the slide rod (13) bracket is equipped with two parallel slide rods (13).

4. The elevator traction testing machine based on a crank-slider as described in claim 1, characterized in that: The first guide wheel (5) and the second guide wheel (7) are the same size and are located at the same height.

5. The elevator traction testing machine based on a crank-slider as described in claim 1, characterized in that: The experimental wheel, the first guide wheel (5), and the second guide wheel (7) are all provided with grooves that cooperate with the carbon fiber belt (8).

6. The elevator traction testing machine based on a crank-slider as described in claim 1, characterized in that: The experimental method includes the following steps: S1. Check the groove fit of the carbon fiber belt (8) with the test wheel (3), the first guide wheel (5), and the second guide wheel (7) to ensure no offset; confirm that the slider (12) slides smoothly on the two parallel slide rods (13) without jamming; check the pin connection between the crank assembly and the drive assembly and the slider (12) to ensure flexible rotation without jamming. S2. Based on the actual testing requirements of the elevator traction system, set the output parameters of the drive components and specify the test duration and reciprocating motion frequency; S3. Start the drive assembly on the fourth bracket (9). Power is transmitted through the first crank connecting rod (10) and the second crank connecting rod (11), driving the slider (12) to slide back and forth along the slide rod (13); S4. Observe the movement of the carbon fiber belt (8) under the traction of the slider (12) along the first guide wheel (5), the second guide wheel (7) and the test wheel (3) to ensure that the belt does not fall off or shift and that the tension is stable. S5. Collect data such as tension change, motion displacement, and velocity curve of carbon fiber belt (8) and record key parameters during the test. If it is necessary to test the traction performance under different working conditions, adjust the parameters of the drive component and repeat steps 2-4 to collect multiple sets of experimental data.

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