Novel motor load test equipment

Abstract

Novel motor load test equipment comprises a voltmeter, a pressure sensor, a bottom plate, a support frame, a temperature sensor, a control circuit and a load simulation mechanism, the voltmeter and the control circuit are installed in the electric control box, and the two side ends of the supporting frame are fixedly installed on the two sides of the bottom plate respectively. The load simulation mechanism comprises an electric push rod, a linear bearing, a connecting plate, a fixing shell and a linear bearing, the lower end of the electric push rod is fixedly mounted at the upper end of the connecting plate, and the linear bearing and the upper end of the electric push rod are fixedly mounted on one side of the lower end of the supporting frame; the pressure sensor is fixedly mounted at the lower end of the connecting plate; the upper end of the fixed shell and the stress surface of the pressure sensor are fixedly mounted together; a brake plate is installed at the lower end of the fixing shell, and a tested motor is fixedly installed on the bottom plate. According to the utility model, the performance test can be carried out on the motor under different loads, the test speed is improved, and when the temperature is too high in the motor test, a worker can be prompted through an alarm sound, and the power supply of the motor is actively turned off.

Description

Technical Field

[0001] The utility model relates to the technical field of testing devices, in particular to a novel motor load testing device. Background Art

[0002] Before finalizing a motor's design for production or undergoing design revisions, it's necessary to perform load testing to determine its maximum load. During this test, the motor's power output shaft is connected to the load side (e.g., a shaft driven by a heavy load via gears, a transmission belt, or a pulley). The motor's maximum load is then measured over a specific test period. For example, if the motor's housing temperature exceeds a certain threshold within a specific timeframe, it indicates a relatively low load capacity; if it does not, it indicates a relatively high load capacity.

[0003] Although existing motor load testing devices meet testing needs to a certain extent, they still have certain technical shortcomings due to structural limitations. Specifically, since the rotating shaft of the motor being tested is driven by a heavy load through gears, transmission belts, and pulleys, in order to prevent the motor from failing to start, its heavy load cannot be too large (during startup, the motor load is very large, and there is a possibility of excessive current flowing through the motor coil and causing a fault). Therefore, since the load driven by the motor is relatively small, the test time is long, resulting in relatively low testing efficiency. In addition, during the test, the tester is required to manually turn off the power supply to the motor after the motor temperature is too high (reaching the load test limit). Therefore, if the relevant tester is not on site for various reasons or is irresponsible and fails to turn off the power supply to the motor in time, there is also a possibility of the motor overload causing a fault. In summary, it is particularly necessary to provide a motor load testing device that can reduce testing time and can promptly shut off the power supply when the load of the motor being tested is too high. Utility Model Content

[0004] In order to overcome the drawbacks of the existing motor load testing device due to structural limitations as described in the background, the utility model provides a new motor load testing device that can increase or decrease the load of the tested motor by friction under the joint action of relevant mechanisms. Compared with the motor-driven heavy load rotation test method, the probability of motor failure due to excessive load at startup is reduced, and the test speed is improved. When the temperature is too high during the motor test, the alarm sound can be used to alert the staff and the power supply of the motor can be actively turned off, which also reduces the probability of motor failure.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A new type of motor load testing equipment includes a voltmeter, a pressure sensor, a base plate, a support frame, and a temperature sensor, and is characterized in that it also has a control circuit and a load simulation mechanism; the voltmeter and control circuit are installed in an electric control box, and the two side ends of the support frame are respectively fixedly installed on both sides of the base plate; the load simulation mechanism includes an electric push rod, a linear bearing, a connecting plate, and a fixed shell, the lower ends of the linear bearing and the electric push rod are fixedly installed on the upper end of the connecting plate, and the upper ends of the linear bearing and the electric push rod are fixedly installed on one side of the lower end of the support frame; the pressure sensor is fixedly installed on the lower end of the connecting plate, the lower end of the fixed shell is an open structure, and the upper end of the fixed shell and the force-bearing surface of the pressure sensor are fixedly installed together; a brake plate is installed at the lower end of the fixed shell, and the motor to be tested is fixedly installed on the base plate; the signal output end of the temperature sensor is electrically connected to the signal input end of the control circuit, the power output end of the pressure sensor is electrically connected to the power input end of the voltmeter, and the power output end of the control circuit is electrically connected to the power input end of the motor to be tested.

[0007] Furthermore, the temperature sensor is installed at the lower end of the support frame, and the temperature sensing surface of the temperature sensor is aligned with the housing of the motor being tested.

[0008] Furthermore, the upper end of the brake plate and the fixing shell are connected together via threads.

[0009] Furthermore, the lower end of the brake plate has a tooth-shaped structure.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention installs the motor to be tested on the base plate test station, and the staff controls the electric push rod to push the rubber brake plate downward through the power switch in combination with the data displayed by the voltmeter. In this way, the lower end of the rubber brake plate and the upper end of the motor's rotating shaft will contact. When the electric push rod drives the rubber brake plate downward with a large or small spacing, the force acting on the motor's rotating shaft will become larger or smaller, and the load of the motor will become relatively larger or smaller, so that the motor performance can be tested under different loads. Compared with the motor-driven heavy load rotation test method, the probability of motor failure due to excessive load at startup is reduced, and the test speed is increased. When the temperature is too high during the motor test, the alarm sound can be used to remind the staff and the power of the motor can be actively turned off, which also reduces the probability of motor failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the overall structure and local structure of the utility model.

[0013] Figure 2 It is a partial structural diagram of the utility model.

[0014] Figure 3 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0015] Figure 1 、 2 As shown in , 3, the new motor load testing equipment includes a voltmeter V, a pressure sensor A2, a base plate 1, a support frame 2, a power module A1, a temperature sensor A3, a power switch S1, and a control circuit 3 and a load simulation mechanism; the voltmeter V, the power switch S1, the power module A1, and the control circuit 3 are installed on the circuit board in the electric control box 4, and the two side ends of the "Π"-shaped support frame 2 are respectively welded on both sides of the middle part of the base plate 1, and the base plate 1 has a slide groove 101 around the middle part, and a fixing bolt 102 is slidably inserted into each slide groove 101; the load simulation mechanism includes an electric push rod M1, a linear bearing 51, a connecting plate 52, and a fixed shell 53. The lower ends of the bearing rods of the two sets of linear bearings 51 are respectively installed on the left and right sides of the upper end of the connecting plate 52 by bolts, and the electric push rod The lower end of M1's push column is bolted to the middle of the upper end of the connecting plate 52. The bearing sleeves of the two linear bearings 51 and the upper end of the cylinder of the electric push rod M1 are bolted to the lower left end of the support frame 2. The pressure sensor A2 is bolted to the middle of the lower end of the connecting plate 52, with the load-bearing surface of the pressure sensor A2 located on the lower side. The lower end of the fixed housing 53 is open, and the outer middle portion of the upper end of the fixed housing 53 and the load-bearing surface of the pressure sensor A2 are bolted together. A rubber brake plate 55 is mounted on the lower end of the fixed housing 53. The electric control box 4 is mounted on the front right end of the base plate 1. The four screw holes at the lower end of the base of the tested motor M are respectively inserted outside the fixing bolts 102. Four nuts are screwed into the four fixing bolts to mount the tested motor M to the middle of the base plate 1. The electric control box 4 is mounted on the right end of the base plate.

[0016] Figure 1 、 2As shown in Figures 3 and 4, temperature sensor A3 is mounted on the underside of support platform 103 at the lower middle end of the support frame, with the temperature sensing surface of temperature sensor A3 located outside the middle portion of the upper end of the housing of the motor under test M. The fixed housing 53 is a cylindrical structure (open at the lower end) with internal threads on its inner end. The rubber brake plate 54 is a cylindrical structure with external threads on its upper end. The upper end of the rubber brake plate 54 and the inner end of the fixed housing 53 are threaded together. The lower end of the rubber brake plate 54 has a toothed structure (to increase friction). The control circuit includes resistors R1, R2, and R3, a transistor Q1, a relay J1, and a buzzer B1 connected via circuit board wiring. One end of the first resistor R1 is connected to one end of the second resistor R2 and one end of the third resistor R3. The other end of the second resistor R2 is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the relay J1 and the negative power input of the buzzer B1. The other end of the third resistor R3 is connected to the emitter of the transistor Q1, and the relay J1 is connected to the positive power input of the buzzer B1.

[0017] Figure 1 、 2As shown in Figure 3, the power input terminals 1 and 2 of the power module A1 are connected to the two poles of the AC 220V power supply via wires respectively. The 380V power supply is connected in series with the three control power input terminals of the relay J1 of the control circuit (a DC electromagnetic contactor can also be used) via wires respectively. The three normally closed contact terminals of the power output terminal relay J1 of the control circuit are connected to the power input terminal of the tested motor M via wires. The power output terminals 3 and 4 of the power module A1 are connected to the power switch S1, the power input terminals 1 and 2 of the temperature sensor A3, the power input terminals 1 and 2 of the pressure sensor A2, the positive power input terminal of the power input terminal relay J1 of the control circuit, and the emitter of the transistor Q1 via wires respectively. The signal output terminal 3 of the temperature sensor A3 is connected to the other end of the signal input terminal resistor R1 of the control circuit via a wire. The power output terminals 3 and 4, 5 and 5 of the power switch S1 and the positive and negative and negative and positive and negative power input terminals of the electric push rod M1 are connected via wires respectively, and the power output terminals 3 and 2 of the pressure sensor A2 and the power input terminal of the voltmeter V are connected via wires. The power module W1 is a finished product of an AC 220V power supply to DC 24V switching power supply module; the transistor Q1 is a 9013 NPN transistor; the relay J1 is a DC24V; the sounder B1 is an FM24V active continuous high-decibel alarm; the resistance values ​​of resistors R1, R2, and R3 are 10K, 1K, and 47K respectively; the pressure sensor A2 is a finished product of a force load sensor of model HYMH-019, which has two power input terminals and one signal output terminal. The greater the detected weight, the higher the output voltage signal, and vice versa. The voltmeter V is a finished product of a large-screen digital display voltmeter of model DL85-2030 (the maximum range is DC 36V, and its display surface is located outside the front end of the electric control box); the temperature sensor A3 is a finished product of a non-contact infrared temperature measurement sensor of model SA10ACF, which has two power input terminals and one signal output terminal. The higher the temperature detected by its probe, the higher the voltage signal output by the signal output terminal, and vice versa. Figure 3 In the present invention, the electrical components are mature existing industrial products, and this application does not elaborate on their working principles.

[0018] Figure 1 、 2As shown in Figures 3 and 4, after 220V AC power enters the power input of power module A1, pins 3 and 4 output a stable 24V DC power supply that is fed into the power inputs of power switch S1, the control circuit, the pressure sensor, and the temperature sensor. In this new device, the motor under test M is mounted on the test station on base plate 1, and the nuts of the four bolts 102 are tightened. When power switch SK is turned on, 380V power is fed into the power input of motor M under test via the three control power inputs and three normally closed contacts of relay J1. This energizes motor M, causing its shaft to rotate. Based on the data displayed on the voltmeter V (when the force exerted by the lower end of the rubber brake plate 54 contacting the motor shaft is too large, the force acting in the opposite direction on the force-bearing surface of the pressure sensor A2 is relatively large, and the voltage signal displayed on the voltmeter V is relatively high; conversely, the voltage signal displayed on the voltmeter V is relatively low), the staff controls the electric push rod to push the rubber brake plate 54 downward through the power switch S1 (the handle of which is located outside the front end of the electrical control box). In this way, the lower end of the rubber brake plate 54 contacts the upper end of the rotating shaft of the motor M. Specifically, when the staff turns the handle of the power switch S1 to the left or right, pins 1 and 2 of the power switch S1 are connected to pins 3 and 4 or pins 5 and 6, respectively. In this way, the positive and negative or negative and positive power input terminals of the electric push rod M1 are respectively energized. When the positive and negative power input terminals of the electric push rod M1 are energized, the push rod drives the rubber brake plate 54 downward. When the negative and positive power input terminals of the electric push rod M1 are energized, the push rod drives the rubber brake plate 54 upward (after the test, the rubber brake plate 54 is controlled to move upward). When the electric push rod M1 drives the rubber brake plate 54 downward by a large or small distance, the force exerted on the motor M's shaft increases or decreases. This results in a relatively large or small load on the motor M's shaft during rotation, allowing performance testing of the motor M under different loads. (When the area of ​​contact between the lower end of the rubber brake plate 54 and the upper end of the motor M's shaft is too large, the load on the motor M is relatively large; conversely, the load on the motor is relatively small.) Compared to the motor-driven heavy load rotation test method, this method reduces the probability of motor failure due to excessive load during startup (during startup, the lower end of the rubber brake plate 54 does not contact the shaft, so the motor load is relatively small) and increases testing speed (the lower end of the rubber brake plate 54 can contact the upper end of the rubber brake plate 54 in a relatively short time and can exert a large force). During the test, when the load on the motor M is relatively small, the temperature of its housing is relatively low, and the voltage signal output by pin 3 of the temperature sensor A3 is relatively low. Conversely, the output voltage signal is relatively high. When the load of motor M does not exceed the threshold and the housing temperature of the motor is lower than 60℃, the voltage signal output from pin 3 of temperature sensor A3 is divided by resistors R1 and R3, and resistor R2 reduces the voltage and limits the current to the base of transistor Q1, which is lower than 0.7V. Transistor Q1 is not conducting, relay J1 will not be energized, and its control power input terminal and normally closed contact terminal are closed. Then, motor M continues to be energized and work.When the load of motor M exceeds the threshold and the housing temperature of the motor is higher than 60℃, the voltage signal output by pin 3 of temperature sensor A3 is divided by resistors R1 and R3, and resistor R2 reduces the voltage and limits the current to enter the base of transistor Q1, which is higher than 0.7V. The collector of transistor Q1 is turned on and outputs a low level to the negative power input terminal of relay J1 (at the same time, the sounder B1 is energized and sounds to remind the staff that the motor housing is overheated). Relay J1 will be energized to open its control power input terminal and normally closed contact terminal, so that motor M will no longer be powered to work. In this way, when the temperature is too high during motor testing, the new model can remind the staff through the alarm sound and actively shut down the power supply of the motor, reducing the chance of motor failure.

[0019] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0020] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A new type of motor load test equipment, including a voltmeter, a pressure sensor, a base plate, a support frame, and a temperature sensor, characterized in that: It also has a control circuit and a load simulation mechanism; the voltmeter and control circuit are installed in the electric control box, and the two side ends of the support frame are respectively fixedly installed on both sides of the base plate; the load simulation mechanism includes an electric push rod, a linear bearing, a connecting plate, and a fixed shell, the lower ends of the linear bearing and the electric push rod are fixedly installed on the upper end of the connecting plate, and the upper ends of the linear bearing and the electric push rod are fixedly installed on one side of the lower end of the support frame; the pressure sensor is fixedly installed on the lower end of the connecting plate, the lower end of the fixed shell is an open structure, and the upper end of the fixed shell and the force surface of the pressure sensor are fixedly installed together; a brake plate is installed at the lower end of the fixed shell, and the motor to be tested is fixedly installed on the base plate; the signal output end of the temperature sensor is electrically connected to the signal input end of the control circuit, the power output end of the pressure sensor is electrically connected to the power input end of the voltmeter, and the power output end of the control circuit is electrically connected to the power input end of the motor to be tested.

2. The new motor load testing equipment according to claim 1 is characterized in that: The temperature sensor is installed at the lower end of the support frame, and the temperature sensing surface of the temperature sensor is aligned with the housing of the tested motor.

3. The new motor load testing equipment according to claim 1 is characterized in that: The upper end of the brake plate and the fixed shell are connected together through threads.

4. The new motor load testing equipment according to claim 1 is characterized in that: The lower end of the brake plate has a tooth-like structure.

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