CN201952077U - Measurement device for elevator balance coefficient - Google Patents

Abstract

The utility model discloses a measurement device for elevator balance coefficients, which comprises a wire rope fixture fixedly clamped on the counterbalance weight-side wire rope of an elevator. The wire rope fixture is arranged vertical to the wire rope. Two force-measuring sensors are respectively fixedly arranged at the lower parts of the left and right ends of the wire rope fixture. The bearing faces of the two force-measuring sensors are arranged vertical to the wire rope. A measuring meter connected with the two force-measuring sensors is used for reading the value of the force-measuring sensors. The direct measurement of elevator balance coefficients by one time is realized by utilizing the measurement device. Meanwhile, the measurement step is simplified. The measurement precision is ensured and the operating efficiency is improved.

Description

A Measuring Device for Elevator Balance Coefficient

technical field

The utility model relates to a measuring device, in particular to a measuring device for measuring the balance coefficient of an elevator.

Background technique

Elevator balance coefficient is one of the important measurement parameters for elevator equipment safety inspection. At present, the method of measuring the balance coefficient of the installed and running elevator is: apply loads of 0%, 25%, 40%, 50%, 75%, and 100% to the elevator, and then measure the elevator car when it is going up and down. When it is at the same horizontal position as the elevator counterweight, the current value of the traction motor, and then on the plane coordinates, the load rate of the elevator when going up and down is used as the abscissa, and the measured current value of the traction motor is used as the vertical axis. Coordinates, draw up and down curves, the load rate corresponding to the intersection of these two curves is the balance coefficient of the elevator.

However, there are following deficiencies in the measurement method of the above-mentioned elevator coefficient:

(1) During the measurement process, it is necessary to manually load the elevator car according to different loads;

(2) The measured current data is a series of measurement values corresponding to different loads, not a one-time measurement, so the measurement process is complicated;

(3) When the elevator car and the counterweight are at the same level, the instantaneous error of the ammeter reading and the drawing error of the intersection point will directly affect the accuracy of the balance coefficient;

(4) The existing measurement method is an indirect measurement method, and there are many measurement errors.

Contents of the invention

The purpose of this utility model is to provide a measuring device for the balance coefficient of an elevator, which can solve the problem of on-site measurement of the balance coefficient of an installed and running elevator. The measuring device can realize the direct measurement of the balance coefficient of the elevator. The measurement accuracy of elevator balance coefficient.

The technical concept of the utility model is: the measurement of the existing elevator balance coefficient has always been an indirect measurement method, and its important reason is that in the elevator balance coefficient formula, the weight W of the elevator counterweight and the weight G of the elevator car are both measured in the field test. less than net weight. This is because the counterweight and the car are connected together by a traction wire rope, and spanned on both sides of the traction sheave. In some elevators, there is a compensation chain connected between the counterweight and the elevator car, and the elevator car is also suspended. For the electrical trailing cables of the elevator, due to the relationship between the elevator stroke, the self-weight of these flexible connecting parts is too large to be ignored. Therefore, in such an interrelated system, the weight W of the elevator counterweight and the weight of the elevator car are measured separately. The weight G is difficult to realize, or requires a very complicated measuring device.

Therefore the inventor thought of directly measuring the difference (W-G) between the elevator car and the elevator counterweight. That is, when the counterweight of the elevator and the car are at the same horizontal position on both sides of the traction sheave, measure the weight difference (W-G) between the counterweight and the car. At this time, for the traction sheave of the elevator, the lengths of the counterweight wire rope and the car wire rope spanning it are the same when the counterweight and the car are at the same horizontal position, so the self-weight of the traction wire rope cancels each other out, so The self-weights of the flexible components produced by the system correlation cancel each other out, so the problem that the weight W of the elevator counterweight and the weight G of the elevator car cannot be measured separately due to the system correlation can be solved. And because the rated load of the elevator is known for each elevator, the balance coefficient of the elevator can be directly calculated according to the measured (W-G).

In order to achieve the purpose of the above invention, the utility model provides a measuring device for the balance coefficient of an elevator, which is located on the counterweight side of the elevator, and the measuring device includes:

A steel wire rope clamp, the fixing clamp is arranged on the steel wire rope on the counterweight side of the elevator, and the steel wire rope clamp is vertically arranged with the steel wire rope;

Two load cells are respectively fixed under the left and right ends of the wire rope clamp, and the two load cells are arranged vertically to the wire rope;

A measuring meter is connected with the two load cells to read the values measured by the load cells.

When measuring with the above-mentioned measuring device, when the elevator car on both sides of the elevator traction sheave and the elevator counterweight are at the same horizontal position, the wire rope clamp is freely pressed on a pair of load cells, and the pair of load cells measures The difference between the elevator car and the elevator counterweight is then according to the following formula:

K=(W-G)/Q

In the formula: K-elevator balance coefficient;

W - the weight of the elevator counterweight;

G - the weight of the elevator car;

Q- rated load of the elevator;

(W-G) - the difference between the elevator car and the elevator counterweight;

Calculate the elevator balance coefficient.

Preferably, the two load cells are respectively fixed on two adjustable brackets, and each adjustable bracket includes:

a fixed bottom plate, which is fixedly arranged on the counterweight side of the elevator;

An adjustment plate, hinged with the fixed bottom plate, the load cells are correspondingly fixed on each adjustment plate, and the adjustment plate can rotate around the fixed bottom plate, so that the force-bearing surface of the load cell fixed on it is always Vertical wire rope setting;

An adjustment rod is arranged between the fixed base plate and the adjustment plate, and is used for fixing the relative position between the fixed base plate and the adjustment plate.

Due to different elevators, the angle between the traction wire rope and the vertical direction is different, and when measuring (W-G), in order to ensure the measurement accuracy, it is necessary to ensure that the wire rope clamp is vertically pressed on the load cell, so by adjusting the adjusting plate The included angle with the fixed bottom plate can ensure that the force bearing surface of the load cell is arranged vertically relative to the steel wire rope.

Preferably, a positioning element is also provided between each load cell and the adjusting plate, and the positioning element includes:

A base, the lower part of which is provided with external threads, and the load cell is correspondingly arranged in the base;

An adjusting nut is threadedly connected with the lower part of the base, and the adjusting nut is fixed on the adjusting plate.

The setting of the above-mentioned positioning element is to ensure that the two load cells are balanced by each other during the measurement, and no deviation occurs, so as to ensure the measurement accuracy.

Preferably, each load cell is also provided with a cone-shaped force-receiving body correspondingly, and the cone-shaped force-bearing body is correspondingly provided between the load cell and the lower end surface of the wire rope clamp. The conical force receiving body can adapt to a certain range of eccentricity when it is under pressure, thereby reducing the loss of partial pressure and ensuring measurement accuracy.

Preferably, a tightening groove is provided on the fixed bottom plate, a slider groove is provided on the adjusting plate, and the adjusting rod includes:

a screw rod, the lower end of the screw rod is arranged in the clamping groove;

A slider, which is arranged in the groove of the slider, a threaded hole is opened on the slider, and the upper part of the screw rod is threadedly connected with the threaded hole;

A screw nut is threadedly connected with the screw.

Preferably, the wire rope clamp includes:

A fixture substrate, the inner surface of which is provided with a V-shaped groove arranged along its length direction;

A fixture splint, the inner surface of which is provided with an arc-shaped protrusion corresponding to the position of the V-shaped groove, the fixture splint is fixedly connected with the fixture base plate, and the arc-shaped protrusion and the V-shaped groove are correspondingly matched to clamp the wire rope;

The two fixture pressure blocks are respectively fixed on the left and right ends of the fixture base plate and the fixture splint, and are correspondingly arranged above the two load cells. During measurement, the pressure blocks of the two fixtures are respectively freely pressed on the two load cells.

Preferably, the measuring meter is an ammeter or a voltmeter or a multimeter or a digital tester that can directly read the weight difference.

Preferably, the load cell is a strain gauge load cell.

The utility model has the following advantages due to the adoption of the above-mentioned technical scheme:

1. The measuring device of the elevator balance coefficient described in the utility model obtains the elevator balance coefficient by directly measuring the weight difference between the elevator counterweight and the elevator car by using a load cell, which belongs to direct measurement, so it has higher measurement accuracy Spend.

2. The measuring device of the elevator balance coefficient described in the utility model can complete the measurement of the elevator balance coefficient at one time when the elevator car is empty. Compared with the existing measurement method, the measurement procedure is greatly simplified and the labor force is reduced. Strength, improving the efficiency of on-site measurement.

3. The measuring device for the elevator balance coefficient described in the utility model has a simple structure, which realizes the transmission of force and weight by using fewer parts, and ensures the angle adjustment of the force measuring point, thereby realizing the non-disassembly on site , The purpose of measurement can be achieved without damaging the elevator components.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of a wire rope clamp on the counterweight side of an elevator.

Fig. 2 is a schematic diagram of the structure of the adjustable bracket.

Fig. 3 is a structural schematic diagram of a load cell provided with a positioning element.

Fig. 4 is a structural schematic diagram of a typical implementation of the elevator balance coefficient measuring device according to the present invention.

Explanation of reference signs:

1- Traction wire rope 2- Fixture base plate 3- Left pressure block of fixture

4-Clamp splint 5-Clamp right pressure block 6-Clamping nut

7-Clamping bolt 8-Fixed bottom plate 9-Adjusting plate

10-screw 11-slider 12-screw nut

13-Rotating shaft 14-Tightening groove 15-Conical force receiving body

16- Load cell base 17- Adjustment nut 18- Leading cable

19-Traction wheel 20-Wire rope clamp 21-Traction frame channel steel

22-Adjustable bracket 23-Load sensor

Detailed ways

As shown in FIG. 4 , the measuring device for the elevator balance coefficient is arranged on the counterweight side of the elevator, and the elevator car and the elevator counterweight are hung on both sides of the elevator traction sheave 19 through the traction wire rope 1 . The wire rope clamp 20 is fixedly mounted on the traction wire rope 1, the two adjustable brackets 22 are respectively fixed on the channel steel 21 of the traction frame on the counterweight side, and the two load cells 23 are respectively fixed on two adjustable brackets. On the bracket 22, adjusting the adjustable bracket 22 can ensure that the load cell 23 is always set vertically to drag the wire rope 1. The ammeter is connected to the two load cells 23 for reading the values measured by the load cells.

As shown in Figure 1, the steel wire rope clamp is the force transmission part in the technical solution, and when it is used to measure the weight difference between the elevator counterweight and the elevator car, it moves together with the traction wire rope 1 when the elevator counterweight moves down, thereby Make the clamp left pressure block 3 and the clamp right pressure block 5 at both ends of the clamp press the force bearing surface of the load cell. The wire rope clamp includes: a strip-shaped clamp base plate 2 and a strip-shaped clamp plate 4 . The inner surface of the clamp base plate 2 is provided with a horizontally arranged V-shaped groove, and the outer surface is provided with a groove for restricting the rotation of the bolt. The inner surface of the fixture splint 4 is provided with an arc-shaped protrusion at the position corresponding to the V-shaped groove, which is used to clamp the traction wire rope 1. The fixture base plate 2 and the fixture splint 4 are fixedly connected by five bolts 7, and each bolt 7 The ends are correspondingly connected with nuts 6, and the bolt baffle is fixed on the outer surface of the fixture base 2 with screws, covering the bolts 7 embedded in the grooves so as not to slide out of the grooves. The left pressure block 3 of the fixture and the right pressure block 5 of the fixture are respectively fixed at the left and right ends of the fixture, and are used to press the force bearing surface of the load cell.

As shown in Figure 2, the adjustable bracket can manually adjust the inclination of the load cell, so that the load cell is perpendicular to the pressure block when measuring the balance coefficient of the elevator. The adjustable bracket includes a fixed base plate 8 , an adjusting plate 9 hinged to the fixed base plate 8 through a rotating shaft 13 , and an adjusting rod for positioning the angle α between the fixed base plate 8 and the adjusting plate 9 . Wherein, the load cell is fixedly arranged on the adjustment plate 9, the fixed bottom plate 8 is provided with a top tight groove 14, the adjustment plate 9 is provided with a slider groove, the adjustment rod includes a screw rod 10, and a screw nut 12 threadedly connected with the screw rod 10, And the slide block 11 that is threadedly connected with the screw rod 10. The upper end of screw rod 10 passes through the slide block groove that is located on the adjusting plate 9, makes slide block 11 embed in the slide block groove of adjusting plate 9, and the lower end of screw rod 10 embeds in the fastening groove 14 on the fixed base plate 8. Thus, the angle α between the adjusting plate 9 and the fixed bottom plate 8 can be adjusted by rotating the screw nut 12 , thereby changing the angular position of the load cell placed on the adjusting plate 9 .

As shown in FIG. 3 , the load cell in this embodiment is a height-adjustable strain gauge load cell. Wherein, the strain gauge load cell is arranged in the load cell base 16, and the conical force receiving body 15 is arranged on the load cell base 16, above the strain gauge load cell, which transmits the received force to the load cell. element. The lower part of the load cell base 16 is provided with an external thread for threaded connection with an adjustment nut 17. This structure can realize the height adjustment of the load cell within the range of 12 mm, thereby ensuring two load cells The sensor measures the force balance of the weight difference between the elevator counterweight and the elevator car. The precision strain gauge force measuring element is composed of multiple strain gauges to form a bridge structure. After the force is applied, the resistance value of the strain gauge changes, causing the unbalanced output voltage of the bridge circuit, which corresponds to the perceived force value. The four-core wire of the bridge circuit, that is, the lead-out cable 18 is drawn out from the side of the load cell base 16 for connection with the ammeter. The conical force receiving body 15 installed on the top of the load cell base 16 can adapt to a certain range of eccentricity when under pressure, thereby reducing partial pressure loss and ensuring measurement accuracy. Display the DC current of +5V inserted in the lead-out cable 18, and the measured value can be read indirectly with a DC voltmeter.

For the elevator to be measured in this embodiment, when in use, adjust the angle α between the adjusting plate 9 and the fixed bottom plate to be about 30 degrees. Make regulating plate 9 and multistrand traction wire rope 1 vertical as far as possible. Make the distance between the apex of the cone-shaped force receiving body 15 of the load cell 23 and the pressure blocks 3 and 5 at both ends of the wire rope clamp 20 greater than 15 mm, then manually release the brake to allow the elevator counterweight to move down slightly, so that the above distance is less than 15 mm. Adjust the adjusting nut 17 at the bottom of the load cell so that the distance between the apex of the conical force receiving body 15 of the two load cells 23 and the pressure blocks 3 and 5 at both ends of the wire rope clamp 20 is as equal as possible and kept at 5 Between -10mm. Connect the lead cables 18 of the two load cells 23 to a +5V DC power supply, and connect the bridge output signals in the lead cables 18 with a DC voltmeter. Manually loosen the brake to allow the multi-strand traction wire rope 1 on the counterweight side to move down, and drive the pressure blocks 3 and 5 at both ends of the wire rope clamp 20 to freely press on the cone-shaped force-bearing bodies 15 of the two load cells 23 . After the reading of the DC voltmeter tends to be stable, record the millivolt reading of the DC voltmeter, convert it into a force value according to the calibration data of the load cell, and obtain the weight difference between the elevator counterweight and the elevator car (W-G ), into the formula of the elevator balance coefficient, the elevator balance coefficient K can be calculated.

It can be seen that the measuring device described in the utility model has a simple structure, is easy to install and operate, and can ensure measurement accuracy at the same time, so it has a good implementation effect.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, rather than as a limitation to the utility model, as long as within the spirit of the utility model, the above-mentioned The changes and modifications of the embodiments will all fall within the scope of the claims of the present utility model.

1. A measuring device for elevator balance factor, located on the counterweight side of the elevator, is characterized in that it comprises:

A steel wire rope clamp, the fixing clamp is arranged on the steel wire rope on the counterweight side of the elevator, and the steel wire rope clamp is vertically arranged with the steel wire rope;

Two load cells are respectively fixed under the left and right ends of the steel wire rope fixture, and the force bearing surfaces of the two load cells are vertically arranged to the wire rope;

A measuring gauge is connected with the two load cells.

2. the measuring device of elevator balance coefficient as claimed in claim 1, is characterized in that, described two force sensors are fixedly respectively fixed on two adjustable supports, and each described adjustable support comprises:

a fixed bottom plate, which is fixedly arranged on the counterweight side of the elevator;

An adjustment plate, hinged with the fixed bottom plate, and the load cells are correspondingly fixed on each adjustment plate;

An adjustment rod is arranged between the fixed base plate and the adjustment plate, and is used for fixing the relative position between the fixed base plate and the adjustment plate.

3. The measuring device of the elevator balance coefficient as claimed in claim 2, characterized in that, a position adjustment element is also provided between each of the load cells and the adjustment plate, and the position adjustment element comprises:

A base, the lower part of which is provided with external threads, and the load cell is correspondingly arranged in the base;

An adjusting nut is threadedly connected with the lower part of the base, and the adjusting nut is fixed on the adjusting plate.

4. The measuring device of elevator balance coefficient as claimed in claim 3, characterized in that, each load cell is also correspondingly provided with a cone-shaped force-bearing body, and the cone-shaped force-bearing body is correspondingly arranged on the force-measuring body Between the sensor and the lower end face of the wire rope clamp.

5. The measuring device of elevator balance coefficient as claimed in claim 2, characterized in that, said fixed base plate is provided with a top tight groove, said adjusting plate is provided with a slider groove, and said adjusting rod comprises:

a screw rod, the lower end of the screw rod is arranged in the clamping groove;

A slider, which is arranged in the groove of the slider, a threaded hole is opened on the slider, and the upper part of the screw rod is threadedly connected with the threaded hole;

A screw nut is threadedly connected with the screw.

6. the measuring device of elevator balance coefficient as claimed in claim 1, is characterized in that, described wire rope clamp comprises:

A fixture substrate, the inner surface of which is provided with a V-shaped groove arranged along its length direction;

A fixture splint, the inner surface of which is provided with an arc-shaped protrusion corresponding to the position of the V-shaped groove, the fixture splint is fixedly connected with the fixture base plate, and the arc-shaped protrusion and the V-shaped groove are correspondingly matched to clamp the wire rope;

The two fixture pressure blocks are respectively fixed on the left and right ends of the fixture base plate and the fixture splint, and are correspondingly arranged above the two load cells.

7. The measuring device of the elevator balance coefficient according to any one of claims 1-6, wherein the measuring meter is an ammeter or a voltmeter or a multimeter or a digital tester that can directly read the weight difference.

8. The measuring device for elevator balance coefficient as claimed in claim 7, characterized in that, the load cell is a strain gauge load cell.

The utility model discloses a measuring device for the balance coefficient of an elevator, which comprises a steel wire rope clamp, which is fixedly clamped on the steel wire rope on the counterweight side of the elevator, and the steel wire rope clamp is vertically arranged with the steel wire rope; two load cells, respectively It is fixedly arranged under the left and right ends of the steel wire rope fixture, and the force bearing surfaces of the two load cells are set perpendicular to the steel wire rope; a measuring gauge is connected with the two load cells to read the force The value measured by the sensor. The measuring device can directly measure the balance coefficient of the elevator at one time, thereby simplifying the measuring steps, ensuring the measuring accuracy and improving the working efficiency.

Claims (8)

1. the measurement mechanism of a balance coefficient of elevator, be located at elevator to heavy side, it is characterized in that comprising:

One steel rope anchor clamps, its geometrical clamp are located on the steel rope of Elevator weight sensor side, and described steel rope anchor clamps are provided with described steel rope is vertical;

Two force transducers are fixed at respectively below the left and right two ends of described steel rope anchor clamps, and the bearing surface of described two force transducers all is provided with described steel rope is vertical;

One meter is connected with described two force transducers.

2. the measurement mechanism of balance coefficient of elevator as claimed in claim 1 is characterized in that, described two force transducers correspondence respectively are fixed on the two adjustable supports, and described each adjustable support includes:

One fixed base plate, its be fixedly installed on elevator to heavy side;

One regulating plate, hinged with described fixed base plate, described force transducer correspondence is fixed on each regulating plate;

One adjust bar is located between described fixed base plate and the regulating plate, is used for fixing the relative position between fixed base plate and the regulating plate.

3. the measurement mechanism of balance coefficient of elevator as claimed in claim 2 is characterized in that, also is equipped with a positioning element between described each force transducer and the regulating plate, and described positioning element comprises:

One pedestal, its underpart is provided with outside thread, and described force transducer correspondence is located in the pedestal;

One positioning nut, it is connected with the lower thread of described pedestal, and described positioning nut is fixed on the regulating plate.

4. the measurement mechanism of balance coefficient of elevator as claimed in claim 3 is characterized in that, also equal correspondence is provided with a taper beaer on described each force transducer, and described taper beaer correspondence is located between the lower surface of force transducer and steel rope anchor clamps.

5. the measurement mechanism of balance coefficient of elevator as claimed in claim 2 is characterized in that, described fixed base plate is provided with one and holds out against groove, and described regulating plate is provided with a slide block slot, and described adjust bar comprises:

One screw rod, the bottom of described screw rod are located at described holding out against in the groove;

One slide block, it is located in the described slide block slot, has a tapped bore on the described slide block, and the top of described screw rod is threaded with described tapped bore;

One bolt and nut is connected with described screw flight.

6. the measurement mechanism of balance coefficient of elevator as claimed in claim 1 is characterized in that, described steel rope anchor clamps comprise:

One fixture substrate, its medial surface are provided with a V-slot along its length direction setting;

One anchor clamps clamping plate, the position of the corresponding V-slot of its medial surface is provided with a circular-arc projection, and described anchor clamps clamping plate are captiveed joint with fixture substrate, and described circular-arc projection and V-slot corresponding matching clamp steel rope;

Two chucking pressure pieces are fixed at the two ends, the left and right sides of described fixture substrate and anchor clamps clamping plate respectively, and the corresponding top of being located at two force transducers.

7. as the measurement mechanism of any described balance coefficient of elevator among the claim 1-6, it is characterized in that described meter is amperemeter/ammtr or volt meter or multi-meter or the digital tester that can directly read weight difference.

8. the measurement mechanism of balance coefficient of elevator as claimed in claim 7 is characterized in that, described force transducer is a strain-type force sensor.

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