Static load test loading control device and working method thereof

Abstract

The invention discloses a static load test loading control device and a working method thereof, and the device is characterized in that the negative electrode of a 60V power supply is directly connected with the negative electrode of an oil pump and is in a long-pass state, and the positive electrode is sequentially connected with the controlled end of a DC contactor unit and the positive electrode of the oil pump; positive and negative electrodes of the input end of the direct-current transformer are correspondingly connected with positive and negative electrodes of a 60V power supply respectively; the positive and negative electrodes of the main control end of the solid-state relay unit are correspondingly connected with the positive and negative electrodes of the no-load line of the static load instrument, the positive electrode of the controlled end is connected with the positive electrode of the output end of the direct-current transformer, and the negative electrode of the controlled end is connected with the positive electrode of the control end of the direct-current contactor unit. The control end cathode of the DC contactor unit is connected with the output end cathode of the DC transformer. A traditional 380V three-phase alternating current driving oil pump system is converted into a 60V direct current motor driving system, so that the dependence on field complex power supply is reduced. And the 60V direct current power supply can meet the loading requirement, so that the application of the equipment in different environments is more flexible and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering quality detection and construction, and relates to a static load test loading control device and a working method thereof. Background Art

[0002] In the field of construction engineering quality inspection, static load test is an important means to evaluate the bearing capacity of foundation and pile foundation. By applying static load to detect the bearing performance of foundation and pile foundation under actual stress conditions, it provides important data support for building design and project acceptance. However, most traditional static load test loading equipment relies on 380V three-phase AC driven oil pump for loading. This mode encounters many challenges and limitations in actual operation.

[0003] First, the problem of on-site power supply has become a key factor restricting the smooth progress of traditional static load tests. Since static load tests often need to be carried out in a specific small area of ​​the construction site, and the power grid power supply requires the laying of long-distance power lines, and there are many large transport vehicles and engineering machinery vehicles on the construction site, the cables are easily damaged, resulting in test interruption. Otherwise, a generator is required to provide the required 380V three-phase AC power. However, the power generation cost of the generator is high, and the oil pump loading time during the static load test is relatively short, resulting in the generator being idle most of the time, which not only wastes a lot of gasoline resources, but also increases the project cost. In addition, because gasoline is a flammable and dangerous commodity, there are many inconveniences in its purchase and carrying. In the construction of large projects, the control of gasoline is particularly strict, and special vehicles are required for transportation. Pile foundation testing is only a small sub-item in the construction project. The project is equipped with limited personnel, and special vehicles can only be used for transportation after approval. The procedures are particularly cumbersome, which adds many inconveniences to the project, especially in some remote or inconveniently transported projects. This problem is particularly prominent.

[0004] Secondly, the use of high voltage electricity brings serious safety hazards. 380V three-phase AC electricity belongs to the category of high voltage electricity, which has extremely high safety requirements for the construction site. During the static load test, the safety operating procedures must be strictly followed to prevent safety accidents such as electric shock. However, even under strict safety management, the use of high voltage electricity still increases the safety risks of the construction site. Once there is a problem with the power supply, it will directly affect the smooth progress of the static load test, and then affect the progress of the project.

[0005] Finally, with the advancement of technology, although new equipment continues to emerge, many old equipment can still meet the specifications in terms of accuracy and do not need to be eliminated immediately. However, most of these old equipment are equipped with 380V AC control boxes, which cannot adapt to the flexibility and safety requirements of power supply on modern construction sites. Therefore, how to enable old equipment to use more efficient and safe power control methods has become an urgent problem to be solved.

[0006] To sum up, traditional static load test loading equipment has many shortcomings in power supply, safety and equipment compatibility. There is an urgent need for a more efficient, safe and convenient static load test loading control device to replace the existing technology to meet the actual needs in the field of construction project quality inspection. Summary of the invention

[0007] The purpose of the present invention is to solve the problems in the prior art that traditional static load test loading equipment has many deficiencies in power supply, safety and equipment compatibility, and to provide a static load test loading control device and a working method thereof.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A static load test loading control device, comprising: A 60V power supply, wherein the negative electrode of the 60V power supply is directly connected to the negative electrode of the oil pump and is in a long-on state, and the positive electrode is sequentially connected to the controlled end of the DC contactor unit and the positive electrode of the oil pump; A DC transformer, wherein the positive and negative poles of the DC transformer input terminals correspond to the positive and negative poles of a 60V power supply; A solid-state relay unit, wherein the positive and negative poles of the main control terminal of the solid-state relay unit are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the output terminal of the DC transformer, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the DC contactor unit; A DC contactor unit, wherein a negative electrode of a control end of the DC contactor unit is connected to a negative electrode of an output end of a DC transformer.

[0009] The DC contactor unit includes a first DC contactor and a second DC contactor, and the solid-state relay unit includes a first solid-state relay and a second solid-state relay; The controlled end of the first DC contactor is connected to the positive electrode of the 60V power supply and the controlled end of the second DC contactor respectively, and the controlled end of the second DC contactor is connected to the positive electrode of the oil pump; The positive and negative poles of the main control terminal of the first solid-state relay are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the output terminal of the DC transformer, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the first DC contactor; The positive and negative poles of the main control terminal of the second solid-state relay are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the DC transformer output terminal, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the second DC contactor.

[0010] The device comprises a fault alarm unit, wherein the positive electrode of the fault alarm unit is connected to the negative electrode of the controlled end of the solid-state relay unit, and the negative electrode is connected to the negative electrode of the output end of the DC transformer.

[0011] The fault alarm unit includes a first fault light and a second fault light; The positive electrode of the first fault lamp is connected to the negative electrode of the controlled end of the first solid-state relay, and the negative electrode is connected to the negative electrode of the output end of the DC transformer; The positive electrode of the second fault lamp is connected to the negative electrode of the controlled end of the second solid-state relay, and the negative electrode is connected to the negative electrode of the output end of the DC transformer.

[0012] The positive electrode of the 60V power supply is connected to one end of the self-reset button switch, and the other end of the self-reset button switch is connected to the positive electrode of the electric oil pump.

[0013] The positive and negative poles of the 60V power supply are respectively connected to the positive and negative poles of the voltage display screen, and the voltage display screen is used to monitor the remaining amount of battery power.

[0014] The positive and negative poles of the output end of the DC transformer correspond to the positive and negative poles of the exhaust fan respectively, and the exhaust fan is used to dissipate heat for the device.

[0015] A working method of a static load test loading control device comprises the following steps: Startup preparation: Confirm that the device has been correctly connected, check whether the power displayed on the voltage display is sufficient, and ensure that the power supply is stable during the test; Check whether the DC transformer, exhaust fan, solid-state relay unit, DC contactor unit and self-reset button switch electrical components are connected correctly; Confirm that the static load instrument and the main control terminal of the solid-state relay are correctly connected to ensure that the control signal can be accurately transmitted; Startup phase: The controlled end of the DC contactor unit is closed, and the positive electrode of the 60V power supply forms a path with the negative electrode of the oil pump through the DC contactor. The 60V power supply starts to work and drives the electric oil pump to load; Loading control phase: The static load instrument sends a control signal to the main control terminal of the solid-state relay unit according to the preset loading program; After the solid-state relay unit receives the control signal, its controlled end is closed, and the 12V DC power supply is transmitted to the control end of the DC contactor unit to control the loading speed or strength of the 60V power supply; By adjusting the control signal of the static load instrument, precise control of the loading process can be achieved to meet different test requirements.

[0016] It also includes the monitoring and protection phase: The voltage display screen continuously monitors the remaining power of the 60V power supply and issues a warning when the power is low, reminding the operator to replace or recharge in time; The fault alarm unit in the device monitors the circuit status in real time and sends out a fault alarm signal when an abnormality occurs in the circuit.

[0017] The exhaust fan starts working during the startup phase to dissipate heat from the device, ensuring that the temperature of the device does not exceed the warning value during long-term operation.

[0018] Compared with the prior art, the present invention has the following beneficial effects: Significantly reduce dependence on power supply: By converting the traditional 380V three-phase AC drive oil pump system into a 60V DC motor drive system, the present invention greatly reduces dependence on complex on-site power supply. Only a 60V DC power supply is needed to meet the loading requirements, making the application of the equipment more flexible and convenient in different environments, while avoiding the waste of gasoline and safety hazards caused by the long-term idling of the generator.

[0019] Improve construction site safety: The low voltage characteristics of 60V DC significantly reduce the requirements for site safety inspections, reduce the risk of shutdowns caused by high voltage electricity, and facilitate safety management of construction sites.

[0020] Technological innovation solves compatibility issues: The present invention overcomes the technical difficulty of incompatibility between the static load instrument control box and the DC power supply. By introducing a solid-state relay as an intermediate control element, the power supply is accurately turned on and off according to the loading instructions, providing technical support for the effective control of the DC motor over the oil pump.

[0021] Enhanced system stability and safety: The innovative design of the series control scheme of solid-state relays and DC contactors effectively disperses the current load, prevents the solid-state relays from being damaged by overheating, and ensures that the system can maintain normal operation when any control component fails through a dual protection mechanism, greatly improving the stability and safety of the system.

[0022] Convenient for user monitoring and maintenance: A fault indicator light is added. When any solid-state relay fails, the corresponding fault light will light up immediately, reminding the user to replace the damaged parts in time, effectively avoiding possible safety accidents. At the same time, a DC voltage display is added to monitor the main power supply voltage, so that users can always grasp the battery power and charge it in time to prevent power loss from affecting the test progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a control schematic diagram of the static load test loading control device of the present invention.

[0025] Figure 2 This is an indication diagram of the electrical component terminals of the static load test loading control device of the present invention.

[0026] Among them: 1-60V DC power supply; 2-60V to 12V transformer; 3-exhaust fan; 4-12V DC power output port; 5-60V power supply voltage display screen; 6-first fault light; 7-first DC contactor; 8-first solid-state relay; 9-second fault light; 10-second DC contactor; 11-manual convenient switch; 12-second solid-state relay; 13-instrument no-load input port; 14-60V DC power output port. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] A static load test loading control device in the present invention comprises: A 60V power supply, wherein the negative electrode of the 60V power supply is directly connected to the negative electrode of the oil pump and is in a long-on state, and the positive electrode is sequentially connected to the controlled end of the DC contactor unit and the positive electrode of the oil pump.

[0031] A DC transformer, wherein the positive and negative poles of the input terminal of the DC transformer are respectively connected to the positive and negative poles of a 60V power supply.

[0032] A solid-state relay unit, wherein the positive and negative poles of the main control end of the solid-state relay unit are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled end is connected to the positive pole of the output end of the DC transformer, and the negative pole of the controlled end is connected to the positive pole of the control end of the DC contactor unit.

[0033] A DC contactor unit, wherein a negative electrode of a control end of the DC contactor unit is connected to a negative electrode of an output end of a DC transformer.

[0034] The DC contactor unit includes a first DC contactor and a second DC contactor, and the solid-state relay unit includes a first solid-state relay and a second solid-state relay; The controlled end of the first DC contactor is connected to the positive electrode of the 60V power supply and the controlled end of the second DC contactor respectively, and the controlled end of the second DC contactor is connected to the positive electrode of the oil pump; The positive and negative poles of the main control terminal of the first solid-state relay are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the output terminal of the DC transformer, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the first DC contactor; The positive and negative poles of the main control terminal of the second solid-state relay are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the DC transformer output terminal, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the second DC contactor.

[0035] A fault alarm unit, wherein the positive electrode of the fault alarm unit is connected to the negative electrode of the controlled end of the solid-state relay unit, and the negative electrode is connected to the negative electrode of the output end of the DC transformer.

[0036] The fault alarm unit includes a first fault light and a second fault light; The positive electrode of the first fault lamp is connected to the negative electrode of the controlled end of the first solid-state relay, and the negative electrode is connected to the negative electrode of the output end of the DC transformer; The positive electrode of the second fault lamp is connected to the negative electrode of the controlled end of the second solid-state relay, and the negative electrode is connected to the negative electrode of the output end of the DC transformer.

[0037] The positive electrode of the 60V power supply is connected to one end of the self-reset button switch, and the other end of the self-reset button switch is connected to the positive electrode of the electric oil pump.

[0038] The positive and negative poles of the 60V power supply are respectively connected to the positive and negative poles of the voltage display screen, and the voltage display screen is used to monitor the remaining amount of battery power.

[0039] The positive and negative poles of the output end of the DC transformer correspond to the positive and negative poles of the exhaust fan respectively, and the exhaust fan is used to dissipate heat for the device.

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1, which is a control schematic diagram of the static load test loading control device in the present invention, the electric oil pump motor is replaced with a 60V DC drive motor; a 60V DC power supply is used to power the instrument and the electric oil pump; the equipment and electrical components used include: a 60V electric oil pump, a 60V to 12V DC transformer, a small exhaust fan, a DC voltage display, a solid-state relay, a DC contactor, an LED power signal indicator, and a self-reset button switch.

[0041] Connection of 60V power circuit: (1) The negative pole of the 60V power supply is directly connected to the negative pole of the oil pump and is in the normally open state; (2) The controlled ends of the two DC contactors are connected in series to control the positive pole of the 60V power supply; (3) The self-reset push button switch and the DC contactor are connected in parallel to control the positive pole of the 60V power supply; (4) Connect the positive and negative poles of the voltage display screen to the positive and negative poles of the 60V power supply to monitor the remaining battery power.

[0042] Connection of 12V control circuit: (1) Connect the positive and negative terminals of the 60V to 12V transformer input to the positive and negative terminals of the 60V power supply; (2) Connect the positive and negative poles of the exhaust fan to the positive and negative poles of the 12V transformer output terminal; (3) The positive and negative poles of the main control terminals of the two solid-state relays are connected to the positive and negative poles of the static load instrument control circuit, the positive pole of the controlled terminal is connected to the positive pole of the 12V transformer output terminal, the negative pole of the controlled terminal is connected to the positive pole of the DC contactor control terminal, and the negative pole of the DC contactor control terminal is connected to the negative pole of the 12V transformer output terminal; (4) The two solid-state relays are connected in parallel, and the solid-state relay and the DC contactor are connected in series; (5) The positive pole of the fault light is connected to the negative pole of the solid-state relay controlled terminal, and the negative pole of the fault light is connected to the negative pole of the 12V transformer output terminal.

[0043] Control principle: (1) The instrument no-load input port controls the on / off of the first solid-state relay and the second solid-state relay; (2) The first solid-state relay controls the on and off of the first DC contactor; (3) The second solid-state relay controls the on and off of the second DC contactor; (4) The first DC contactor and the second DC contactor jointly control the on and off of the 60V DC output port; (5) The manual convenient switch controls the on and off of the 60V DC output port; (6) The 60V DC power supply provides power for the 60V to 12V transformer, the 60V power supply voltage display screen, and the 60V DC output port; (7) The 60V to 12V transformer provides power for the exhaust fan, the 12V DC power output port, the first fault light, the first DC contactor, the first solid-state relay, the second fault light, the second DC contactor, and the second solid-state relay.

[0044] An embodiment of the present invention is a working method of a static load test loading control device, comprising the following steps: Startup preparation: Confirm that the device has been correctly connected, check whether the power displayed on the voltage display is sufficient, and ensure that the power supply is stable during the test; Check whether the DC transformer, exhaust fan, solid-state relay unit, DC contactor unit and self-reset button switch electrical components are connected correctly; Confirm that the static load instrument and the main control terminal of the solid-state relay are correctly connected to ensure that the control signal can be accurately transmitted; Startup phase: The controlled end of the DC contactor unit is closed, and the positive electrode of the 60V power supply forms a path with the negative electrode of the oil pump through the DC contactor. The 60V power supply starts to work and drives the electric oil pump to load; The exhaust fan starts working during the startup phase to dissipate heat from the device, ensuring that the temperature of the device does not exceed the warning value during long-term operation.

[0045] Loading control phase: The static load instrument sends a control signal to the main control terminal of the solid-state relay unit according to the preset loading program; After the solid-state relay unit receives the control signal, its controlled end is closed, and the 12V DC power supply is transmitted to the control end of the DC contactor unit to control the loading speed or strength of the 60V power supply; By adjusting the control signal of the static load instrument, precise control of the loading process can be achieved to meet different test requirements.

[0046] Monitoring and protection phase: The voltage display screen continuously monitors the remaining power of the 60V power supply and issues a warning when the power is low, reminding the operator to replace or recharge in time; The fault alarm unit in the device monitors the circuit status in real time and sends out a fault alarm signal when an abnormality occurs in the circuit.

[0047] The core of the present invention is to transform the traditional 380V three-phase AC power-driven oil pump system into a 60V DC motor-driven system. This transformation not only greatly reduces the dependence on on-site power supply, but also enables a 60V DC power supply (such as a two-wheeled electric vehicle battery) to meet the loading requirements, thereby avoiding the waste of gasoline and safety hazards caused by the generator idling for a long time. At the same time, the low voltage characteristics of 60V DC also significantly reduce the requirements for site safety inspections and reduce the risk of shutdowns caused by high voltage electricity.

[0048] In order to achieve effective control of the oil pump by the DC motor, the technical problem of incompatibility between the static load instrument control box and the DC power supply was overcome. Through in-depth research on the control principle of the static load instrument, it was found that it only needs to output a 6-12V DC voltage signal when loading. Based on this discovery, the solid-state relay was cleverly introduced as an intermediate control element, and its sensitivity to voltage signals and rapid response capabilities were used to achieve accurate on and off of the power supply according to the loading instructions. However, in the face of the high power demand and high current challenges of the DC oil pump, a series control scheme of the solid-state relay and the DC contactor was further innovatively designed. This design not only effectively disperses the current load and prevents the solid-state relay from being damaged by overheating, but also ensures that the system can maintain normal operation when any control element fails through a dual protection mechanism (i.e., the series use of two solid-state relays and two DC contactors), greatly improving the stability and safety of the system.

[0049] In addition, in order to facilitate users to monitor and maintain the system in a timely manner, two fault indicator lights are specially added. When any solid-state relay fails, the corresponding fault light will light up immediately to remind users to replace the damaged parts in time, thereby avoiding safety accidents that may be caused by continuous loading of the oil pump due to the breakdown of the solid-state relay. At the same time, in order to monitor the remaining battery power, a DC voltage display is added to monitor the main power supply voltage, keep track of the battery power at all times, and charge the battery in time to prevent power loss from affecting the progress of the test.

[0050] In summary, the DC-driven static load test loading equipment control box of the present invention not only solves many problems of traditional loading equipment in terms of power supply, cost, safety, etc., but also realizes precise control and efficient management of the loading process through innovative technical design. This invention not only brings revolutionary changes to the field of static load testing, but also injects new vitality into the development of related industries.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A static load test loading control device, characterized in that: include: A 60V power supply, wherein the negative electrode of the 60V power supply is directly connected to the negative electrode of the oil pump and is in a long-on state, and the positive electrode is sequentially connected to the controlled end of the DC contactor unit and the positive electrode of the oil pump; A DC transformer, wherein the positive and negative poles of the DC transformer input terminals correspond to the positive and negative poles of a 60V power supply; A solid-state relay unit, wherein the positive and negative poles of the main control terminal of the solid-state relay unit are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the output terminal of the DC transformer, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the DC contactor unit; A DC contactor unit, wherein a negative electrode of a control end of the DC contactor unit is connected to a negative electrode of an output end of a DC transformer.

2. A static load test loading control device as claimed in claim 1, characterized in that: The DC contactor unit includes a first DC contactor and a second DC contactor, and the solid-state relay unit includes a first solid-state relay and a second solid-state relay; The controlled end of the first DC contactor is connected to the positive electrode of the 60V power supply and the controlled end of the second DC contactor respectively, and the controlled end of the second DC contactor is connected to the positive electrode of the oil pump; The positive and negative poles of the main control terminal of the first solid-state relay are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the output terminal of the DC transformer, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the first DC contactor; The positive and negative poles of the main control terminal of the second solid-state relay are respectively connected to the positive and negative poles of the no-load circuit of the static load instrument, the positive pole of the controlled terminal is connected to the positive pole of the DC transformer output terminal, and the negative pole of the controlled terminal is connected to the positive pole of the control terminal of the second DC contactor.

3. A static load test loading control device as claimed in claim 2, characterized in that: The device comprises a fault alarm unit, wherein the positive electrode of the fault alarm unit is connected to the negative electrode of the controlled end of the solid-state relay unit, and the negative electrode is connected to the negative electrode of the output end of the DC transformer.

4. A static load test loading control device as claimed in claim 3, characterized in that: The fault alarm unit includes a first fault light and a second fault light; The positive electrode of the first fault lamp is connected to the negative electrode of the controlled end of the first solid-state relay, and the negative electrode is connected to the negative electrode of the output end of the DC transformer; The positive electrode of the second fault lamp is connected to the negative electrode of the controlled end of the second solid-state relay, and the negative electrode is connected to the negative electrode of the output end of the DC transformer.

5. A static load test loading control device as claimed in claim 1, characterized in that: The positive electrode of the 60V power supply is connected to one end of the self-reset button switch, and the other end of the self-reset button switch is connected to the positive electrode of the electric oil pump.

6. A static load test loading control device as claimed in claim 1, characterized in that: The positive and negative poles of the 60V power supply are respectively connected to the positive and negative poles of the voltage display screen, and the voltage display screen is used to monitor the remaining amount of battery power.

7. A static load test loading control device as claimed in claim 1, characterized in that: The positive and negative poles of the output end of the DC transformer correspond to the positive and negative poles of the exhaust fan respectively, and the exhaust fan is used to dissipate heat for the device.

8. A working method of a static load test loading control device, characterized in that: The following steps are involved: Startup preparation: Confirm that the device has been correctly connected, check whether the power displayed on the voltage display is sufficient, and ensure that the power supply is stable during the test; Check whether the DC transformer, exhaust fan, solid-state relay unit, DC contactor unit and self-reset button switch electrical components are connected correctly; Confirm that the static load instrument and the main control terminal of the solid-state relay are correctly connected to ensure that the control signal can be accurately transmitted; Startup phase: The controlled end of the DC contactor unit is closed, and the positive electrode of the 60V power supply forms a path with the negative electrode of the oil pump through the DC contactor. The 60V power supply starts to work and drives the electric oil pump to load; Loading control phase: The static load instrument sends a control signal to the main control terminal of the solid-state relay unit according to the preset loading program; After the solid-state relay unit receives the control signal, its controlled end is closed, and the 12V DC power supply is transmitted to the control end of the DC contactor unit to control the loading speed or strength of the 60V power supply; By adjusting the control signal of the static load instrument, precise control of the loading process can be achieved to meet different test requirements.

9. A working method of a static load test loading control device as claimed in claim 8, characterized in that: It also includes the monitoring and protection phase: The voltage display screen continuously monitors the remaining power of the 60V power supply and issues a warning when the power is low, reminding the operator to replace or recharge in time; The fault alarm unit in the device monitors the circuit status in real time and sends out a fault alarm signal when an abnormality occurs in the circuit.

10. A working method of a static load test loading control device according to claim 8, characterized in that: The exhaust fan starts working during the startup phase to dissipate heat from the device, ensuring that the temperature of the device does not exceed the warning value during long-term operation.

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