Automatic loading device for elevator load test

Abstract

The utility model relates to the technical field of elevator load test, in particular to an automatic loading device for elevator load test, which comprises a folding water bag, weighing equipment, a three-position four-way electromagnetic directional valve, a water pump module and a controller circuit, can realize automatic loading and unloading of elevator load, and is simple in structure, low in manufacturing cost, simple and convenient to operate and high in reliability. The device is simple in structure, high in efficiency, high in loading and unloading automation degree, capable of achieving random switching between manual loading and automatic loading, capable of monitoring the loading weight in real time and achieving overall metering, and insuspicion in accuracy of the loading weight. During loading and unloading, an operator only needs to enter and exit from the lift car when the water bag device is placed and removed in the lift car and the water conveying pipe is connected and removed, so that the danger that the operator frequently enters and exits from the lift car in the loading and unloading process and possibly causes shearing is effectively avoided, and the loading and unloading process is high in safety.

Description

Technical Field

[0001] This utility model relates to the field of elevator load testing technology, specifically an automatic loading device for elevator load testing. Background Technology

[0002] During elevator installation, commissioning, and inspection, load tests are conducted to verify the elevator's performance. This requires loading heavy objects onto the car. These objects need to be transported to the landing doors and moved in and out of the car, so the weight of each individual object cannot be too heavy. Therefore, the loaded objects are typically composed of many small parts. This loading method presents the following problems:

[0003] 1. In order to ensure the accuracy of the load, the weight of these heavy objects (except for those using standard weights) should be measured one by one. The measurement work is quite tedious, so in the actual situation on site, it is basically not measured but estimated instead. Therefore, the accuracy of the loaded weight has to be questioned.

[0004] 2. Loading heavy objects requires manual labor to move them into and out of the elevator car one by one, which is labor-intensive, inefficient, and prone to damaging the car floor and walls. Furthermore, the elevator's reliability is unknown before load testing. If the elevator's performance does not meet expectations, slippage during loading can easily occur, leading to serious accidents such as shearing injuries to operators entering and exiting the car. Moreover, the loading process itself introduces additional loads, causing the actual load to exceed the expected load, further increasing the risk of slippage and shearing accidents. For example, during a 125% load test, when the elevator is loaded to 125% of its rated load, personnel must enter and exit the car. This adds the weight of one person and an impact load to the 125% rated load, a significant amount. Assuming the elevator's rated capacity is 13 people, one person's weight is 7.7% of the rated load. Therefore, when loading to 125% of the rated load, the actual load reaches at least 132.7% of the rated load, especially when the elevator's rated load is relatively small, where the percentage of additional load is even higher.

[0005] Therefore, existing elevator load testing methods, in addition to requiring manual operation, also make it difficult to automatically and accurately control the load. Summary of the Invention

[0006] In view of this, the purpose of this utility model is to provide an automatic loading device for elevator load testing, so as to solve the technical problems in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model discloses an automatic loading device for elevator load testing, which includes a water storage tank;

[0009] Water storage tank;

[0010] A collapsible water bladder for applying load to an elevator, the collapsible water bladder being placed inside the elevator;

[0011] A weighing device for collecting the real-time load of the collapsible water bladder, the weighing device being positioned below the collapsible water bladder;

[0012] A three-position four-way solenoid valve is used to switch the flow direction in the pipeline. The three-position four-way solenoid valve is connected to the water bladder and the weighing equipment through the pipeline.

[0013] The water pump module is used to drive the water flow in the pipeline, and is connected to the three-position four-way solenoid valve through the pipeline.

[0014] The system includes a controller circuit connected to the weighing equipment, the three-position four-way solenoid valve, and the water pump module. In automatic mode, the controller circuit automatically controls the three-position four-way solenoid valve and the water pump module based on the real-time load and the set target load range, so that the real-time load is within the set target load range. Alternatively, in manual mode, the controller circuit controls the three-position four-way solenoid valve and the water pump module based on an externally input switch signal.

[0015] In one embodiment of this application, the three-position four-way solenoid valve includes a first working end, a second working end, a third working end, and a fourth working end;

[0016] The water storage tank is connected to the first working end of the three-position four-way solenoid valve via a water pipe. The second working end of the three-position four-way solenoid valve is connected to the inlet end of the water pump via a water pipe. The outlet end of the water pump is connected to the third working end of the three-position four-way solenoid valve via a water pipe. The fourth working end of the three-position four-way solenoid valve is connected to the folding water bag via a water pipe.

[0017] When the first working end is connected to the second working end and the third working end is connected to the fourth working end, the water pump module drives the water in the water storage tank to flow to the folding water bag; when the second working end is connected to the fourth working end and the first working end is connected to the third working end, the water pump module drives the water in the folding water bag to flow to the water storage tank.

[0018] In one embodiment of this application, the water pump module includes a water pump and an electric motor, wherein the power shaft of the electric motor is connected to the water pump for driving the water pump to operate.

[0019] In one embodiment of this application, the controller circuit includes a main circuit, a water pump control circuit, a switching control circuit, and a PLC integrated controller;

[0020] The main circuit includes an inverter. The input side of the inverter is connected in series with a first manual switch and a second manual switch and then connected to an external DC power supply. The output side of the inverter is connected in series with a first relay contact and then connected to the water pump module.

[0021] The water pump control circuit is connected to the main circuit and is used to control the working status of the water pump module;

[0022] The switching control loop is connected to the main loop and the PLC integrated controller, and is used to control the working state of the three-position four-way solenoid directional valve.

[0023] In one embodiment of this application, the water pump control circuit includes a first relay coil for controlling the first relay contact, a motor start button, and a motor stop button;

[0024] One end of the first relay coil is connected in series with the motor start button and the motor stop button and then connected to the positive terminal of the external DC power supply; the other end of the first relay coil is connected to the negative terminal of the external DC power supply.

[0025] The motor start button is also connected in parallel to a first relay contact controlled by the first relay coil;

[0026] The motor start button is a normally open button, and the motor stop button is a normally closed button.

[0027] In one embodiment of this application, the switching control loop includes a loading electromagnet, a unloading electromagnet, a loading control electromagnet, and an unloading control electromagnet.

[0028] One end of the loading electromagnet is connected in series with the loading control contact and then connected to the positive terminal of the external DC power supply; the other end of the loading electromagnet is connected to the negative terminal of the external DC power supply.

[0029] One end of the load reduction electromagnet is connected in series with the load reduction control contact and then connected to the positive terminal of an external DC power supply; the other end of the load reduction electromagnet is connected to the negative terminal of an external DC power supply.

[0030] One end of the loading control electromagnet is connected in series with the PLC integrated controller, the load increase / decrease start button, and the load increase / decrease stop button, and then connected to the positive terminal of the external DC power supply. The other end of the loading control electromagnet is connected to the negative terminal of the external DC power supply. The loading control electromagnet is used to control the switching state of the loading control contacts. The PLC integrated controller is used to control the on / off state of the branch where the loading control electromagnet is located.

[0031] One end of the load reduction control electromagnet is connected in series with the PLC integrated controller, the load increase / decrease start button, and the load increase / decrease stop button, and then connected to the positive terminal of the external DC power supply. The other end of the load reduction control electromagnet is connected to the negative terminal of the external DC power supply. The load reduction control electromagnet is used to control the switching state of the load reduction control contacts. The PLC integrated controller is used to control the on / off state of the branch where the load reduction control electromagnet is located.

[0032] The load increase / decrease start button is a normally open button, and the load increase / decrease stop button is a normally closed button. The load increase / decrease start button is also connected in parallel with a second relay contact. The second relay contact is controlled by a second relay coil. One end of the second relay coil is connected in series with the load increase / decrease start button and the load increase / decrease stop button and then connected to the positive terminal of an external DC power supply. The other end of one end of the second relay coil is connected to the negative terminal of the external DC power supply.

[0033] In one embodiment of this application, a load start button and a load unload start button are also included;

[0034] The loading start button includes a first normally open contact and a first normally closed contact that are synchronously locked. The first normally open contact is connected in series in the branch where the loading electromagnet is located, and the first normally closed contact is connected in series in the branch where the loading control electromagnet is located. One end of the loading electromagnet is connected to one end of the loading control electromagnet.

[0035] The load reduction start button includes a second normally open contact and a second normally closed contact that are synchronously locked. The second normally open contact is connected in series in the branch where the load reduction electromagnet is located, and the second normally closed contact is connected in series in the branch where the load reduction control electromagnet is located. One end of the load reduction electromagnet is connected to one end of the load reduction control electromagnet.

[0036] In one embodiment of this application, the collapsible water bladder includes a tray, a guide rod disposed at the center of the tray, and a telescopic water bladder sleeved on the guide rod;

[0037] The telescopic water bladder is equipped with a quick-connect check valve, and the telescopic water bladder is connected to the water pipe through the quick-connect check valve.

[0038] The beneficial effects of this utility model are as follows: This utility model provides an automatic loading device for elevator load testing, including a retractable water bladder, a weighing device, a three-position four-way electromagnetic reversing valve, a water pump module, and a controller circuit. This application can realize automatic loading and unloading of elevator loads. It has a simple structure, low cost, easy operation, high efficiency, and a high degree of automation in loading and unloading. It can also achieve arbitrary switching between manual and automatic loading, real-time monitoring of the loaded weight, and overall measurement, ensuring the accuracy of the loaded weight. During loading and unloading, operators only need to enter and exit the car when placing and removing the water bladder device, and connecting and disconnecting the water supply pipe. This effectively avoids the danger of shearing that may result from frequent entry and exit of operators into the car during the loading and unloading process, resulting in a high level of safety during the loading and unloading process. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0040] Figure 1 This is a schematic diagram of the structure of an automatic loading device for elevator load testing shown in one embodiment of this application;

[0041] Figure 2 This is a cross-sectional view of a folding water bladder in one embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the empty water bladder in one embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the structure of the folded water bladder in its full-water state according to one embodiment of this application;

[0044] Figure 5 This is a circuit structure diagram of the controller circuit in one embodiment of this application;

[0045] Water storage tank;

[0046] Foldable water bladder, 21-tray, 22-guide post, 23-telescopic water bladder, 24-quick-install check valve connector;

[0047] Weighing equipment;

[0048] Three-position four-way solenoid directional valve;

[0049] Water pump;

[0050] Electric motor. Detailed Implementation

[0051] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0052] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the layers related to the present invention and are not drawn according to the actual number, shape and size of the layers in the actual implementation. In the actual implementation, the form, number and proportion of each layer can be arbitrarily changed, and the layer layout may also be more complex.

[0053] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of the present invention; however, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0054] Figure 1 This is a schematic diagram of the structure of an automatic loading device for elevator load testing shown in one embodiment of this application, as follows: Figure 1 As shown in this embodiment, an automatic loading device for elevator load testing includes a water tank 1, a folding water bladder 2, a weighing device 3, a three-position four-way solenoid valve 4, a water pump module, and a controller circuit. The specific connection relationships and principles are as follows:

[0055] Water storage tank 1 is used to store the load medium: water. In this application, water storage tank 1 is a vehicle-mounted water storage tank.

[0056] Foldable water bag 2, placed in the elevator, is used to apply load to the elevator;

[0057] Figure 2 This is a cross-sectional view of the folding water bladder in one embodiment of this application, as shown below. Figure 2 As shown, the retractable water bladder 2 includes a tray 21, a guide rod 22 located at the center of the tray, and a telescopic water bladder 23 sleeved on the guide rod;

[0058] The telescopic water bladder 2 is equipped with a quick-connect check valve 24, and the telescopic water bladder 2 is connected to the water pipe through the quick-connect check valve 24.

[0059] Figure 3 This is a schematic diagram of the structure of the folded water bladder in an embodiment of this application, showing its empty state. Figure 4 This is a schematic diagram of the structure of the folded water bladder in a fully water-filled state according to one embodiment of this application, as shown below. Figures 3-4As shown, when loading or unloading, the telescopic water bladder 2 moves along the guide rod 22, thereby making the retractable water bladder 2 more stable as a whole.

[0060] Weighing device 3 is installed below the folding water bladder to collect the real-time load of the folding water bladder;

[0061] The three-position four-way electromagnetic reversing valve 4 is connected to the water bladder 2 and the weighing device 3 through pipelines to switch the flow direction in the pipeline;

[0062] In this embodiment, the three-position four-way solenoid valve 4 includes a first working end A, a second working end C, a third working end D, and a fourth working end B;

[0063] The water storage tank 1 is connected to the first working end A of the three-position four-way solenoid valve 4 via a water pipe. The second working end C of the three-position four-way solenoid valve 4 is connected to the inlet end of the water pump via a water pipe. The outlet end of the water pump is connected to the third working end D of the three-position four-way solenoid valve 4 via a water pipe. The fourth working end B of the three-position four-way solenoid valve 4 is connected to the retractable water bladder via a water pipe. In use, the water bladder is connected to the fourth working end B of the solenoid valve via the flexible hose of the quick-connect check valve connector 24.

[0064] When the first working end A is connected to the second working end B and the third working end C and the fourth working end D are connected, the water pump module drives the water in the water storage tank 1 to flow to the folding water bag 2.

[0065] When the second working end C and the fourth working end B are connected and the first working end A is connected to the third working end D, the water pump module drives the water in the folding water bag 2 to flow to the water storage tank 1.

[0066] The three-position four-way solenoid directional valve 4 has three operating states: loading state, unloading state, and stop state. These three operating states are determined by the position of the internal magnetic core. When there is no external electromagnet attraction, the magnetic core is in the middle position, and the three-position four-way solenoid directional valve 4 is in the stop state. When the loading electromagnet TU generates a magnetic field, it attracts the magnetic core to the first position, thus connecting the first working end A with the second working end B and the third working end C with the fourth working end D. At this time, water can only flow from the water storage tank 1 into the folded water bladder 2, and the system is in the loading state. When the unloading electromagnet TD generates a magnetic field, it attracts the magnetic core to the second position, connecting the second working end C with the fourth working end B and the first working end A with the third working end D. At this time, water can only flow from the folded water bladder 2 into the water storage tank 1, and the system is in the unloading state.

[0067] Therefore, the core of this application is how to control the loading and unloading states of the system, and the control logic is the controller circuit described below.

[0068] The water pump module is connected to the three-position four-way electromagnetic reversing valve through a pipeline and is used to drive the water flow in the pipeline.

[0069] The water pump module includes a water pump 5 and an electric motor 6. The power shaft of the electric motor 6 is connected to the water pump 5 to drive the water pump 5 to operate.

[0070] The working principle of the elevator load test automatic loading system is as follows:

[0071] During use, the hose of the quick-install check valve joint 24 is used to connect the folding water bag 2 to the B interface on the three-position four-way electromagnetic reversing valve 4.

[0072] Before starting the load addition and subtraction, the three-position four-way electromagnetic reversing valve 4 is in the stop position. At this time, the water storage tank 1, the water inlet of the water pump 5, and the water outlet of the water pump 5 are interconnected. If the electric motor 6 is in the operating state, the water in the water pump 5 can form a no-load internal circulation. Therefore, the electric motor can be in the operating state during the load addition and subtraction process, and there is no need to frequently start and stop the electric motor.

[0073] After connecting the water pipe, turn on the weighing device 3, turn on the automatic loading control system, and start the electric motor 6 of the water pump 5. After the data transmission between the weighing device 3 and the automatic loading control system is normal, the load addition and subtraction operation can be implemented.

[0074] Before starting the load addition and subtraction, set the target load W0 in the load control system (when the water in the water bag needs to be recovered, the target load W0 is set as: W0 = G0 + △, where △ is the water bag tray, the water bag, and the remaining water that cannot be collected).

[0075] Then, start the load addition and subtraction control button to achieve automatic load addition and subtraction. When it is detected that the current load (W = G0 + G) is the set target load W0, the load addition and subtraction automatically ends. After the load addition and subtraction ends, the connecting hose between the water bag and the electromagnetic reversing valve can be removed. Because the pipe joint uses a quick-install check valve joint, it can be quickly installed and disassembled, and the water in both ends of the interface will not flow out after disassembly, so that the load of the water bag can be maintained, and the corresponding load test can be carried out on the elevator or the water bag can be removed from the car.

[0076] The automatic load addition and subtraction control logic is as follows: when the control system determines that W < W0 × 98%, the control system automatically controls the electromagnetic reversing valve to push the valve core to the loading position, and the water in the water tank passes through the interface A → C → the water inlet of the water pump → the water outlet of the water pump → D → B → the water bag to achieve water injection and loading; when the control system determines that W > W0 × 102%, the control system automatically controls the electromagnetic reversing valve to push the valve core to the unloading position, and the water in the water bag passes through the interface B → C → the water inlet of the water pump → the water outlet of the water pump → D → A → the water tank to achieve water collection and unloading; when the control system determines that W0 × 98% ≤ W ≤ W0 × 102%, the control system automatically controls the electromagnetic reversing valve to push the valve core to the stop position to stop the load addition and subtraction.

[0077] The controller circuit is connected to the weighing equipment, the three-position four-way solenoid valve, and the water pump module. In automatic mode, it automatically controls the three-position four-way solenoid valve and the water pump module according to the real-time load and the set target load range so that the real-time load is within the set target load range. Alternatively, in manual mode, it controls the three-position four-way solenoid valve and the water pump module based on the externally input switch signal.

[0078] To achieve the above functions, the controller circuit structure is required as follows: Figure 5 This is a circuit structure diagram of the controller circuit in one embodiment of this application, as shown below. Figure 5 As shown, the controller circuit includes a main circuit, a water pump control circuit, a switching control circuit, and a PLC integrated controller;

[0079] The main circuit includes an inverter NBQ. The input side DC of the inverter NBQ is connected in series with the first manual switch K1 and the second manual switch K2, and then connected to an external DC power supply DC. The output side AC of the inverter NBQ is connected in series with the first relay contact KMD and then connected to the motor MD.

[0080] The water pump control circuit is connected to the main circuit and is used to control the working status of the water pump module;

[0081] The switching control loop is connected to the main loop and the PLC integrated controller to control the working state of the three-position four-way solenoid directional valve 4.

[0082] The water pump control circuit includes a first relay coil KMD for controlling the first relay contact KMD, a motor start button ADQ, and a motor stop button ADT;

[0083] One end of the first relay coil KMD is connected in series with the motor start button ADQ and the motor stop button ADT, and then connected to the positive terminal DC+ of the external DC power supply; the other end of the first relay coil KMD is connected to the negative terminal DC- of the external DC power supply.

[0084] The motor start button ADQ is also connected in parallel to the first relay contact KMD, which is controlled by the first relay coil KMD;

[0085] The motor start button ADQ is a normally open button, and the motor stop button ADT is a normally closed button.

[0086] The switching control loop includes loading electromagnet TU, unloading electromagnet TD, loading control electromagnet KTU, and unloading control electromagnet KTD.

[0087] One end of the loading electromagnet TU is connected in series with the loading control contact KTU and then connected to the positive terminal DC+ of the external DC power supply. The other end of the loading electromagnet TU is connected to the negative terminal DC- of the external DC power supply.

[0088] One end of the load reduction electromagnet TD is connected in series with the load reduction control contact KTD and then connected to the positive terminal DC+ of the external DC power supply. The other end of the load reduction electromagnet TD is connected to the negative terminal DC- of the external DC power supply.

[0089] One end of the load control electromagnet KTU is connected in series with the PLC integrated controller, the load start button ATQ, and the load stop button ATT, and then connected to the positive terminal DC+ of the external DC power supply. The other end of the load control electromagnet KTU is connected to the negative terminal DC- of the external DC power supply. The load control electromagnet KTU is used to control the switching state of the load control contact KTU. The PLC integrated controller is used to control the on / off state of the branch where the load control electromagnet KTU is located.

[0090] One end of the load shedding control electromagnet KTD is connected in series with the PLC integrated controller, the load shedding start button ATQ, and the load shedding stop button ATT, and then connected to the positive terminal DC+ of the external DC power supply. The other end of the load shedding control electromagnet KTD is connected to the negative terminal DC- of the external DC power supply. The load shedding control electromagnet KTD is used to control the switching state of the load shedding control contact KTD. The PLC integrated controller is used to control the on / off state of the branch where the load shedding control electromagnet KTD is located.

[0091] The load increase / decrease start button is a normally open button ATQ, and the load increase / decrease stop button ATT is a normally closed button. The load increase / decrease start button ATQ is also connected in parallel with a second relay contact KT. The second relay contact KT is controlled by a second relay coil KT. One end of the second relay coil KT is connected in series with the load increase / decrease start button ATQ and the load increase / decrease stop button ATT, and then connected to the positive terminal DC+ of the external DC power supply. The other end of one end of the second relay coil KT is connected to the negative terminal DC- of the external DC power supply.

[0092] In addition, it also includes a load start button (ATU) and a load unload start button (ATD);

[0093] The load start button ATU includes a first normally open contact and a first normally closed contact for synchronous locking. The first normally open contact is connected in series in the branch where the load electromagnet TU is located, and the first normally closed contact is connected in series in the branch where the load control electromagnet KTU is located. One end of the load electromagnet TU is connected to one end of the load control electromagnet KTU.

[0094] The load reduction start button ATD includes a second normally open contact and a second normally closed contact that are synchronously locked. The second normally open contact is connected in series in the branch where the load reduction electromagnet TD is located, and the second normally closed contact is connected in series in the branch where the load reduction control electromagnet KTD is located. One end of the load reduction electromagnet TD is connected to one end of the load reduction control electromagnet KTD.

[0095] Based on the above circuit structure, its operating principle is as follows:

[0096] 1. After the loading device is ready, turn on the weighing instrument on the load-bearing body, and turn on the main power switch K1 and the water pump power switch K2 of the electrical control system.

[0097] 2. The DC power supply DC on the motor vehicle powers the PCL integrated controller in the electrical control system through K1. The weight G monitored by the weighing instrument can be transmitted to the PCL integrated controller in the electrical control system in real time through wired or wireless transmission. The PCL integrated controller can calculate the current load W=G+G0 in real time and display it.

[0098] 3. The PCL integrated controller can set the target load W0;

[0099] 4. The PCL integrated controller compares W and W0 and can output switching signals KU and KD in real time according to the following rules:

[0100] When W < W0 × 98%, KU is closed and KD is open.

[0101] When W > W0 × 102%, KU is open and KD is closed.

[0102] When W0×98%≤W≤W0×102%, KU disconnects and KD disconnects.

[0103] 5. The DC power supply on the motor vehicle powers NBQ in the electrical control system through K1 and K2 and outputs AC power. The AC power is applied to the normally open contact of KMD contactor, so that the motor MD is in a running standby state.

[0104] 6. When the ADQ button is pressed, the circuit +→K1→1→ADT→2→ADQ→3→KMD→12→K1→- is connected, so KMD is engaged and the motor MD is powered and runs. The circuit 2→KMD→3 is connected, which blocks the ADQ button and keeps the circuit +→K1→1→ADT→2→KMD→3→KMD→12→K1→- continuously connected, maintaining the continuous engagement of KMD. When the ADT button is pressed, the circuit +→K1→1→ADT→2→KMD→3→KMD→12→K1→- is broken, so KMD is released and the motor MD is de-energized and stops.

[0105] 7. Pressing the ATQ button will connect the +→K1→1→ATT→4→ATQ→5→KT→12→K1→- line, causing KT to engage and activating the automatic loading function. The ATQ button will be disabled by the ATQ button, keeping the +→K1→1→ATT→4→KT→5→KT→12→K1→- line continuously engaged, thus maintaining KT's continuous engagement. When the ATT button is pressed, the +→K1→1→ATT→4→KT→5→KT→12→K1→- line will be disconnected, releasing KT and stopping the automatic loading function.

[0106] 8. When W < W0×98% (KU is closed and KD is open), the automatic loading function is activated. The circuit +→K1→1→ATT→4→ATQ→5→KU→ATU→6→KTD→KTU→12→K1→- is connected, so KTU is energized. The circuit 6→KTU→TU→12 is connected, so TU is energized, which puts the solenoid directional valve in the loading state to achieve automatic loading. When the loading reaches W0×98%≤W≤W0×102%, both KU and KD are open, so both KTU and TU are released, which switches the solenoid directional valve to the stop loading state and the automatic loading is completed.

[0107] 9. When W > W0 × 102% (KU is open and KD is closed), the automatic loading function is activated. The circuit + → K1 → 1 → ATT → 4 → ATQ → 5 → KD → ATD → 7 → KTU → 11 → KTD → 12 → K1 → - is connected, so KTD is energized. The circuit 7 → KTD → 10 → TD → 12 is connected, so TD is energized, putting the solenoid directional valve in the unloading state to achieve automatic unloading. When the unloading reaches W0 × 98% ≤ W ≤ W0 × 102%, both KU and KD are open, so both KTD and TD are released, causing the solenoid directional valve to switch to the stop unloading state, and the automatic unloading is completed.

[0108] 10. When the automatic loading function is activated under the condition that W0×98%≤W≤W0×102% (at which point KU and KD are both disconnected), KTU, KTD, TU, and TD will not engage, and the solenoid directional valve will remain in the stopped loading state without the need for loading or unloading.

[0109] 11. Without activating the automatic loading function, when the ATU button is pressed continuously, the circuit +→K1→1→ ATU→6→KTD→KTU→12→K1→- is connected, so KTU is energized. The circuit 6→KTU→TU→12 is connected, so TU is energized, putting the solenoid directional valve in the loading state to achieve manual loading. When the ATU button is released, both KTU and TU are released, causing the solenoid directional valve to switch to the stop loading state and stop manual loading.

[0110] 12. Without activating the automatic loading function, when the ATD button is pressed continuously, the circuit +→K1→1→ ATD→7→KTU→KTD→12→K1→- is connected, so KTD is continuously engaged. The circuit 7→KTD→TD→12 is connected, so TD is engaged, putting the solenoid directional valve in the unloading state to achieve manual unloading. When the ATD button is released, both KTD and TD are released, causing the solenoid directional valve to switch to the stop loading state to stop manual loading.

[0111] This application also provides an automatic loading method for elevator load testing, including the following steps:

[0112] Obtain the real-time load exerted by the folding water bag on the elevator. ;

[0113] The real-time load With the set target load Compare; when satisfied When the load control signal is output, the load control signal is output; when the condition is met... When the load reduction control signal is met, output the load reduction control signal; when the load is satisfied... When this occurs, an interrupt control signal is output, wherein... . , .

[0114] In one embodiment of this application, the loading control signal controls the water pump module to turn on, and connects the first working end of the three-position four-way solenoid valve to the second working end, and the third working end to the fourth working end.

[0115] The load reduction control signal controls the water pump module to start, and connects the second working end and the fourth working end of the three-position four-way solenoid valve, and connects the first working end and the third working end.

[0116] The interrupt control signal shuts down the water pump module and puts the three-position four-way solenoid valve in the neutral position.

[0117] This utility model discloses an automatic loading device for elevator load testing, comprising a retractable water bladder, a weighing device, a three-position four-way solenoid valve, a water pump module, and a controller circuit.

[0118] This application enables automatic loading and unloading of elevator loads. It has a simple structure, low cost, easy operation, high efficiency, and a high degree of automation in loading and unloading. It can switch between manual and automatic loading at will, monitor the loaded weight in real time, and measure the overall load. The accuracy of the loaded weight is beyond doubt.

[0119] During loading and unloading, operators only need to enter and exit the car when installing and removing the water bladder device, or connecting and disconnecting the water supply pipe. This effectively avoids the danger of shearing that may result from frequent entry and exit of operators into the car during the loading and unloading process, making the loading and unloading process highly safe.

[0120] There is no need to frequently move heavy objects in and out of the car, thus avoiding damage to the car floor and walls.

[0121] Water can be reused, reducing the labor required to move weights and lowering the cost of the experiment.

[0122] Water can be delivered using hoses, without being restricted by transportation routes, as long as a motor vehicle can transport the water tank to the vicinity of the elevator.

[0123] The water bladder in the load-bearing structure of the loading system utilizes a central guide column, which solves the problem of ensuring the water bladder is placed stably and does not tilt or press against the car wall, while also avoiding the need for a bulky external frame to maintain the stability of the water bladder. After unloading, the load-bearing structure does not require disassembly and is lightweight and compact, facilitating placement, removal, handling, and vehicle transport. Therefore, this load-bearing structure has strong practicality.

[0124] In the above embodiments, although the present invention has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims.

[0125] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An automatic loading device for elevator load testing, characterized in that, include: Water storage tank (1); A retractable water bladder (2) for applying load to the elevator, the retractable water bladder being placed inside the elevator; A weighing device (3) for collecting the real-time load of the folding water bladder, the weighing device (3) being disposed below the folding water bladder; A three-position four-way solenoid valve (4) is used to switch the flow direction of the pipeline. The three-position four-way solenoid valve (4) is connected to the water bladder (2) and the weighing device (3) through the pipeline. The water pump module is used to drive the water flow in the pipeline, and is connected to the three-position four-way solenoid valve (4) through the pipeline; The controller circuit is connected to the weighing device (3), the three-position four-way solenoid valve (4), and the water pump module. The controller circuit is used to automatically control the three-position four-way solenoid valve (4) and the water pump module in automatic mode according to the real-time load and the set target load range so that the real-time load is within the set target load range; or, in manual mode, to control the three-position four-way solenoid valve (4) and the water pump module based on the externally input switch signal.

2. The automatic loading device for elevator load testing according to claim 1, characterized in that, The three-position four-way solenoid directional valve (4) includes a first working end, a second working end, a third working end and a fourth working end; The water storage tank (1) is connected to the first working end of the three-position four-way electromagnetic reversing valve (4) through a water pipe. The second working end of the three-position four-way electromagnetic reversing valve (4) is connected to the inlet end of the water pump module through a water pipe. The outlet end of the water pump module is connected to the third working end of the three-position four-way electromagnetic reversing valve (4) through a water pipe. The fourth working end of the three-position four-way electromagnetic reversing valve (4) is connected to the folding water bag through a water pipe. When the first working end is connected to the second working end and the third working end is connected to the fourth working end, the water pump module drives the water in the water storage tank (1) to flow to the folding water bag (2); when the second working end is connected to the fourth working end and the first working end is connected to the third working end, the water pump module drives the water in the folding water bag (2) to flow to the water storage tank (1).

3. The automatic loading device for elevator load testing according to claim 1, characterized in that, The water pump module includes a water pump (5) and an electric motor (6), the power shaft of which is connected to the water pump (5) to drive the water pump (5) to operate.

4. The automatic loading device for elevator load testing according to claim 1, characterized in that, The controller circuit includes a main circuit, a water pump control circuit, a switching control circuit, and a PLC integrated controller. The main circuit includes an inverter. The input side of the inverter is connected in series with a first manual switch and a second manual switch and then connected to an external DC power supply. The output side of the inverter is connected in series with a first relay contact and then connected to the water pump module. The water pump control circuit is connected to the main circuit and is used to control the working status of the water pump module; The switching control loop is connected to the main loop and the PLC integrated controller, and is used to control the working state of the three-position four-way solenoid directional valve (4).

5. The automatic loading device for elevator load testing according to claim 4, characterized in that, The water pump control circuit includes a first relay coil for controlling the first relay contact, a motor start button, and a motor stop button; One end of the first relay coil is connected in series with the motor start button and the motor stop button and then connected to the positive terminal of the external DC power supply; the other end of the first relay coil is connected to the negative terminal of the external DC power supply. The motor start button is also connected in parallel to a first relay contact controlled by the first relay coil; The motor start button is a normally open button, and the motor stop button is a normally closed button.

6. The automatic loading device for elevator load testing according to claim 4, characterized in that, The switching control circuit includes a loading electromagnet, a unloading electromagnet, a loading control electromagnet, and an unloading control electromagnet. One end of the loading electromagnet is connected in series with the loading control contact and then connected to the positive terminal of the external DC power supply; the other end of the loading electromagnet is connected to the negative terminal of the external DC power supply. One end of the load reduction electromagnet is connected in series with the load reduction control contact and then connected to the positive terminal of an external DC power supply; the other end of the load reduction electromagnet is connected to the negative terminal of an external DC power supply. One end of the loading control electromagnet is connected in series with the PLC integrated controller, the load increase / decrease start button, and the load increase / decrease stop button, and then connected to the positive terminal of the external DC power supply. The other end of the loading control electromagnet is connected to the negative terminal of the external DC power supply. The loading control electromagnet is used to control the switching state of the loading control contacts. The PLC integrated controller is used to control the on / off state of the branch where the loading control electromagnet is located. One end of the load reduction control electromagnet is connected in series with the PLC integrated controller, the load increase / decrease start button, and the load increase / decrease stop button, and then connected to the positive terminal of the external DC power supply. The other end of the load reduction control electromagnet is connected to the negative terminal of the external DC power supply. The load reduction control electromagnet is used to control the switching state of the load reduction control contacts. The PLC integrated controller is used to control the on / off state of the branch where the load reduction control electromagnet is located. The load increase / decrease start button is a normally open button, and the load increase / decrease stop button is a normally closed button. The load increase / decrease start button is also connected in parallel with a second relay contact. The second relay contact is controlled by a second relay coil. One end of the second relay coil is connected in series with the load increase / decrease start button and the load increase / decrease stop button and then connected to the positive terminal of an external DC power supply. The other end of one end of the second relay coil is connected to the negative terminal of the external DC power supply.

7. The automatic loading device for elevator load testing according to claim 6, characterized in that, It also includes a load start button and a load unload start button; The loading start button includes a first normally open contact and a first normally closed contact that are synchronously locked. The first normally open contact is connected in series in the branch where the loading electromagnet is located, and the first normally closed contact is connected in series in the branch where the loading control electromagnet is located. One end of the loading electromagnet is connected to one end of the loading control electromagnet. The load reduction start button includes a second normally open contact and a second normally closed contact that are synchronously locked. The second normally open contact is connected in series in the branch where the load reduction electromagnet is located, and the second normally closed contact is connected in series in the branch where the load reduction control electromagnet is located. One end of the load reduction electromagnet is connected to one end of the load reduction control electromagnet.

8. The automatic loading device for elevator load testing according to claim 1, characterized in that, The collapsible water bladder (2) includes a tray (21), a guide rod (22) located at the center of the tray, and a telescopic water bladder (23) sleeved on the guide rod (22). The telescopic water bladder (23) is equipped with a quick-connect check valve (24), and the telescopic water bladder (23) is connected to the water pipe through the quick-connect check valve.

Images