Testing device for static friction force of traction sheave

Abstract

The utility model provides a traction sheave static friction force testing device. A V-shaped iron supporting assembly is arranged at the top end of a testing frame and used for installing a rotor body of a traction machine to be tested. The brake disc is used for being installed on a rotor body of the traction machine to be tested, the butterfly brake is placed in the brake disc in a tested state, and the butterfly brake is used for providing braking power for the brake disc; the guide wheel is mounted at the bottom end of the test frame, and the two tension sensors are mounted at the two ends of the steel belt respectively; one end of the steel belt is fixed on the test frame through one tension sensor, the other end of the steel belt is connected with the steel belt pre-tightening mechanism through the other tension sensor, the middle part of the steel belt is supported and wound by the guide wheel and a traction wheel of the tested traction machine, and the steel belt pre-tightening mechanism is arranged on the test frame. The testing device has the advantages that various working condition environments can be simulated and tested, continuous measurement is realized, and the improvement cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator component detection. Specifically, it relates to a test device for the static friction force of a traction wheel. Background Art

[0002] The traction wheel is a key component of the traction machine. A car is suspended on one side of the traction wheel, and a counterweight is suspended on the other side. Torque of the traction machine is output by forming a friction force with the suspended steel belt (or wire rope), so as to drive the elevator car to move up and down. This requires that there must be sufficient friction force between the traction wheel and the steel belt (or wire rope). Otherwise, the steel belt (or wire rope) will slip on the traction wheel, the elevator cannot operate normally, and even the safety of passengers will be affected. Therefore, during the production process of the traction wheel, it is necessary to detect the maximum friction force between the traction wheel and the steel belt (or wire rope) to determine whether the processing of the traction wheel meets the usage requirements. However, there are many factors affecting the maximum static friction force. The common detection method of domestic manufacturers at present is to assemble the traction wheel into the traction machine and install it in the elevator system, and measure on site according to the actual working conditions. A complete set of elevator configurations such as the traction machine, guide rail system, car system, counterweight system, car door system, control system, and brake system need to be installed, which requires a lot of manpower and material resources, consumes a lot of time, and can only detect the friction force under a certain working condition each time, with a small detection coverage.

[0003] According to the elevator inspection standard, the static friction force of the traction wheel should not be less than 1.25 times the unbalanced load on both sides. Otherwise, the elevator cannot operate normally. However, traction wheels of the same specification may be used in multiple elevator load systems, and the traction wheel is subject to different radial loads, and the friction force inspection standards are also different. This brings trouble to the flexibility of on-site measurement. For example:

[0004]

[0005] To improve the detection flexibility, be able to simulate multiple working conditions, and improve the detection efficiency, it is necessary to improve the current test method. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a test device for the static friction force of a traction wheel that can simulate and test multiple working condition environments, realize continuous measurement, and has a low transformation cost.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is: A test device for the static friction force of a traction wheel, comprising a test frame, an adjusting lead screw assembly, a linear guide rail, a brake disc, a disc brake, a V-shaped iron support assembly, a steel belt pre-tightening mechanism, a steel belt, a tension sensor, and a guide wheel;

[0008] The V-shaped iron support assembly is arranged at the top of the test stand. One end of the V-shaped iron support assembly is a fixed end and the other end is a movable end. The V-shaped iron support assembly is used to install the rotor body of the traction machine to be tested; the movable end is driven by an adjusting screw rod assembly to move along a linear guide rail for adjusting the span between the two ends of the V-shaped iron support assembly.

[0009] The butterfly brake is installed relative to one end of the V-shaped iron support assembly. The brake disc is used to be installed on the rotor body of the traction machine to be tested and is placed in the butterfly brake under the tested state. The butterfly brake is used to provide braking power to the brake disc.

[0010] The guide wheel is installed at the bottom end of the test stand. There are two tension sensors which are respectively installed at both ends of the steel belt.

[0011] One end of the steel belt is fixed to the test stand through a tension sensor, and the other end of the steel belt is connected to the steel belt pre-tightening mechanism through another tension sensor. The middle part of the steel belt is supported and wound by the guide wheel and the traction wheel of the traction machine to be tested. The steel belt pre-tightening mechanism is installed on the test stand.

[0012] Preferably, the adjusting screw rod assembly is a manual screw rod assembly.

[0013] Preferably, the fixed end of the V-shaped iron support assembly is used to support one end of the main shaft of the rotor body of the traction machine to be tested, and the movable end of the V-shaped iron support assembly is used to support the installation end of the traction wheel of the traction machine to be tested.

[0014] Preferably, the butterfly brake is installed at the movable end of the V-shaped iron support assembly and moves synchronously with the movable end.

[0015] Preferably, the butterfly brake is an electric drive brake.

[0016] Preferably, there are two guide wheels. A bottom plate is arranged at the bottom end of the test stand. The two guide wheels are installed on the bottom plate through bearings.

[0017] Preferably, both ends of the steel belt are fixed to the tension sensor through rope head clamps. The tension sensor is an S-shaped tension sensor.

[0018] Preferably, the steel belt pre-tightening mechanism includes a hand wheel and a T-shaped screw rod assembly. The hand wheel and the T-shaped screw rod assembly are installed on the support plate at the top of the test stand. The tension sensor at the corresponding end of the steel belt is connected and fixed to the lower movable end of the T-shaped screw rod assembly.

[0019] The utility model has prominent substantive features and remarkable progress compared with the prior art. Specifically, the utility model is provided with a V-shaped support iron assembly with adjustable span, which can be used to detect traction machines of various different specifications. By arranging a disc brake and a brake disc to cooperate with the traction machine for assembly, the locked state of the traction machine is simulated; by arranging a steel belt, a tension sensor and a steel belt pre-tightening mechanism, the simulated load ratios at both ends of the traction machine can be set to any optional value, and different working condition environments can be simulated. Through the adjustment of the steel belt pre-tightening mechanism, the maximum value of the static friction force is finally simulated, which provides convenience for the detection of the static friction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic diagram of the overall structure of a device for testing the static friction force of a traction wheel in the utility model.

[0021] Figure 2 FIG. is a front view of a device for testing the static friction force of a traction wheel in the utility model.

[0022] Figure 3 FIG. is a side view of a device for testing the static friction force of a traction wheel in the utility model.

[0023] Figure 4 FIG. is a top view of a device for testing the static friction force of a traction wheel in the utility model.

[0024] In the figure: 1. adjusting screw rod assembly; 2. linear guide rail; 3. test stand; 4. bottom plate; 5. guide wheel; 6. rope head clamp; 7. tension sensor; 8. support plate; 9. trapezoidal screw rod assembly; 10. hand wheel; 11. top plate; 12. V-shaped iron support assembly; 13. rotor body main shaft; 14. traction wheel; 15. steel belt; 16. brake disc; 17. disc brake. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following is a further detailed description of the technical solution of the utility model through specific embodiments.

[0026] As Figures 1 - 4 shown, a device for testing the static friction force of a traction wheel includes a test stand 3, an adjusting screw rod assembly 1, a linear guide rail 2, a brake disc 16, a disc brake 17, a V-shaped iron support assembly 12, a steel belt pre-tightening mechanism, a steel belt 15, a tension sensor 7 and a guide wheel 5.

[0027] In this embodiment, the test stand 3 is a trapezoidal test stand, which has two tops with different heights. The highest position is the top plate 11, the stepped position is the support plate 8, and the bottom is provided with a bottom plate 4.

[0028] The V-shaped iron support assembly 12 is arranged on the top plate 11 of the test stand 3. One end of the V-shaped iron support assembly 12 is a fixed end and the other end is a movable end. The V-shaped iron support assembly 12 is used to install the rotor body main shaft 13 of the traction machine to be tested; the movable end is driven by the adjusting screw assembly 1 to move along the linear guide rail 2 for adjusting the span between the two ends of the V-shaped iron support assembly 12.

[0029] In this embodiment, the adjusting screw assembly 1 adopts a manual screw assembly and is adjusted by means of a handwheel, etc. The linear guide rail adopts an HWC linear guide rail, which has good supporting performance.

[0030] The butterfly brake 17 is installed relative to one end of the V-shaped iron support assembly 12. In this embodiment, the butterfly brake is an electric drive brake, which opens when powered on and closes when powered off. The fixed end of the V-shaped iron support assembly 12 is used to support one end of the rotor body main shaft 13 of the traction machine to be tested, and the movable end of the V-shaped iron support assembly 12 is used to support the installation end of the traction wheel 14 of the traction machine to be tested. The disc brake is installed at the movable end of the V-shaped iron support assembly 12, on the same side as the traction wheel 14. The brake disc 16 is used to be installed on the rotor body main shaft 13 of the traction machine to be tested and is placed in the butterfly brake 17 under the tested state. The butterfly brake 17 is used to provide braking power to the brake disc 16, thereby locking the coaxially installed traction wheel 14.

[0031] The guide wheel 5 is installed on the bottom plate 4 of the test stand 3. There are two tension sensors 7, with the model of S-shaped tension sensors, and they are respectively installed at both ends of the steel belt 15.

[0032] One end of the steel belt 15 is installed with a tension sensor through a rope head clamp 6, and this side tension sensor is fixed on the bottom plate 4 of the test stand 3;

[0033] The other end of the steel belt 15 is installed with another tension sensor through a rope head clamp 6, and this side tension sensor 7 is connected to the steel belt pre-tightening mechanism. In this embodiment, the steel belt pre-tightening mechanism includes a handwheel 10 and a T-shaped screw rod assembly 9. The handwheel 10 and the T-shaped screw rod assembly 9 are installed on the support plate 8 of the test stand, and the tension sensor on the same side is connected and fixed to the lower movable end of the T-shaped screw rod assembly.

[0034] The middle part of the steel belt sequentially passes around the guide wheel 5 and the traction wheel 14 of the traction machine to be tested. There are two guide wheels 5, and the two guide wheels 5 are installed on the bottom plate 4 through bearings.

[0035] Principle description: A method for testing the static friction force of a traction wheel, including the test device for the static friction force of the traction wheel, and the test is carried out through the following process:

[0036] Step 1) Energize the butterfly brake to release it, install the brake disc into the rotor body of the traction machine to be tested, then adjust the adjusting screw rod assembly to control the V-shaped support iron assembly to an appropriate span, place both ends of the traction machine to be tested on both ends of the V-shaped support iron assembly, and accurately install the brake disc into the butterfly brake to form the assembly of the simulated braking assembly; during the detection process, the state of the traction wheel switches from free rotation to locking and fixing; a convenient and reliable braking device is required. The present utility model adopts a butterfly brake, which is small in size, easy to install, and reliable in performance.

[0037] Step 2) Connect one end of the steel belt to the tension sensor fixed on the bottom plate of the test stand through a rope head clamp, and the other end of the steel belt successively bypasses the traction wheel at the top of the test stand and the guide wheel at the bottom of the test stand, and then is connected to the tension sensor fixed on the steel belt pre-tightening mechanism through a rope head clamp to form the assembly of the traction machine traction assembly; among them, the diameter of the traction wheel is small, and the distance between the steel belts suspended at both ends is small. In order to facilitate the operation of the loading end, two guide wheels are added; the operation space can be greatly increased.

[0038] Step 3) Adjust the steel belt pre-tightening mechanism to tighten the steel belt, and the tensions at both ends of the steel belt are always equal until the display values of the tension sensors at both ends reach the set value. Cut off the power supply of the butterfly brake, the brake disc is locked, and the traction wheel is braked and cannot rotate;

[0039] Step 4) Continue to adjust the steel belt pre-tightening mechanism to tighten the steel belt. The value of the tension sensor on one side of the steel belt pre-tightening mechanism becomes larger, and the value of the other tension sensor remains unchanged; continue to adjust the steel belt pre-tightening mechanism to further tighten the steel belt until the value of the other tension sensor begins to increase. Record the values of the two tension sensors at this time and calculate the static friction force of the traction wheel.

[0040] It should be particularly noted that during the detection process, the traction wheel, the guide wheel, and the support plate must be counterweighted to ensure that the force on the steel belt is uniform and not skewed. For this reason, the bottom plate is equipped with tracks and can slide horizontally freely, which is convenient for adjustment and makes the measurement result more accurate; the top plate is equipped with an adjusting screw rod assembly with a ball screw, which can adjust the distance between the V-shaped iron support assemblies and is applicable to rotor bodies of various specifications, with a wide application range.

[0041] The core lies in that the hanging weights at both ends of the traction wheel are equivalent to the tension loaded by the steel belt. The key is to first make the tensions at both ends balanced, ensure that there is a certain radial pressure between the traction wheel and the steel belt, then lock and fix the traction wheel, and continue to load tension at one end to make the traction wheel and the steel belt generate friction. The value of the tension sensor on one side of the steel belt pre-tightening mechanism is F1, the friction force of the traction machine to be tested is F2, and the value of the other tension sensor is F3, then F1 = F2 + F3.

[0042] The device and method save the detection cost, improve the detection efficiency and accuracy; for traction wheels of the same specification, the friction forces (unbalanced loads) under different load conditions can be detected; and reliable test basis can be provided in the R & D stage of products.

[0043] Finally, it should be noted that the above has described the preferred embodiments of this patent in detail, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of this patent.

Claims

1. A device for testing the static friction of a traction sheave, characterized in that: It includes a test stand, an adjusting screw assembly, a linear guide rail, a brake disc, a disc brake, a V-shaped iron support assembly, a steel belt pre-tightening mechanism, a steel belt, a tension sensor and a guide wheel; The V-shaped iron support assembly is arranged at the top of the test frame, one end of the V-shaped iron support assembly is a fixed end, and the other end is a movable end, and the V-shaped iron support assembly is used to install the rotor body of the tested traction machine; the movable end is driven by the adjusting screw assembly to move along the linear guide rail, and is used to adjust the span of the two ends of the V-shaped iron support assembly; The disc brake is installed relative to one end of the V-shaped iron support assembly, the brake disc is used to be installed on the rotor body of the traction machine under test, and the butterfly brake is placed in the tested state, and the butterfly brake is used to provide braking power to the brake disc; The guide wheel is installed at the bottom end of the test frame, and two tension sensors are provided and respectively installed at the two ends of the steel belt; One end of the steel belt is fixed to the test frame through a tension sensor, and the other end of the steel belt is connected to the steel belt pretensioning mechanism through another tension sensor. The middle part of the steel belt is supported and wound by the guide wheel and the traction wheel of the tested traction machine, and the steel belt pretensioning mechanism is installed on the test frame.

2. The traction sheave static friction force testing device according to claim 1, characterized in that: The adjusting screw assembly is a manual screw assembly.

3. The static friction force testing device of the traction sheave according to claim 1 or 2, characterized in that: The fixed end of the V-shaped iron support assembly is used to set up one end of the rotor main shaft of the tested traction machine, and the movable end of the V-shaped iron support assembly is used to set up the traction wheel installation end of the tested traction machine.

4. The traction sheave static friction force testing device according to claim 3, characterized in that: The butterfly brake is installed on the movable end of the V-shaped iron support assembly and moves synchronously with the movable end.

5. The traction sheave static friction force testing device according to claim 4, characterized in that: The butterfly brake is an electric drive brake.

6. The traction sheave static friction force testing device according to claim 5, characterized in that: The guide wheels are provided with two, a bottom plate is provided at the bottom end of the test frame, and the two guide wheels are mounted on the bottom plate through bearings.

7. The traction sheave static friction force testing device according to claim 6, characterized in that: The two ends of the steel belt are fixed to the tension sensor through rope end clamps, and the tension sensor is an S-shaped tension sensor.

8. The traction sheave static friction test device according to claim 7, characterized in that: The steel belt pre-tightening mechanism includes a hand wheel and a T-shaped screw assembly, which are installed on the support plate at the top of the test frame, and the tension sensor at the corresponding end of the steel belt is connected and fixed to the lower movable end of the T-shaped screw assembly.

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