Constant strain consolidation apparatus back pressure pump control loading device

Abstract

This application proposes a constant strain consolidation apparatus back pressure pump controlled loading device, including a drive mechanism, a high-pressure micro-flow plunger pump, a fluid connection assembly, and a control mechanism. The drive mechanism includes a motor and a coupling connected to the motor's output shaft; the high-pressure micro-flow plunger pump is connected to the coupling; the fluid connection assembly includes an inlet connector and an outlet connector, the inlet connector being connected to the suction end of the high-pressure micro-flow plunger pump and the other end being connected to the water supply end, and the outlet connector being connected to the discharge end of the high-pressure micro-flow plunger pump and the other end being connected to the consolidation box; the control mechanism includes a pressure sensor and a circuit board, the circuit board being electrically connected to the pressure sensor and the motor, and the pressure sensor being connected to the pipeline of the outlet connector; the motor drives the high-pressure micro-flow plunger pump through the coupling to output a steplessly adjustable high-pressure micro-flow water body, which is then transported to the consolidation box through the outlet connector to achieve back pressure loading control of the consolidation sample, thereby improving the problems of limited loading pressure range and insufficient accuracy of micro-flow and pressure control in existing back pressure loading devices.

Description

Technical Field

[0001] This application relates to the field of constant strain consolidation apparatus, and more particularly to a back pressure pump controlled loading device for a constant strain consolidation apparatus. Background Technology

[0002] A constant strain consolidation apparatus is a specialized experimental device for testing the one-dimensional consolidation properties of soil. It typically consists of a loading frame, a consolidation chamber, and pore pressure and back pressure measurement systems. Under constant strain conditions, axial loads and back pressures are applied to the soil sample, allowing for the testing of key mechanical and seepage parameters such as stress history, consolidation coefficient, and permeability coefficient. In engineering practice, to apply and maintain a certain pore water pressure within the consolidation chamber during the consolidation test, a back pressure loading device is commonly used with constant strain consolidation apparatuses. By adjusting the volume and pressure of the back pressure water, the pore water pressure state of the sample can be controlled.

[0003] Existing constant strain consolidation apparatuses typically employ mechanical counterpressure loading devices, usually consisting of a stepper motor, lead screw, and piston cylinder working in tandem. The motor drives the lead screw to propel the piston reciprocating within the cylinder. Volume changes are measured by calculating the number of steps taken by the stepper motor. An external pressure sensor provides pressure feedback control to alter the water volume within the cylinder and apply counterpressure. However, because water volume and pressure can only be controlled unidirectionally via the piston's movement within the cylinder, its functionality is relatively limited. In actual experiments, the limited length, volume, and outer diameter of the piston cylinder result in a very limited volume of water loaded per cycle, and the loading pressure is also low, failing to achieve stepless volume and high-pressure control. Furthermore, the accumulation of errors in the stepper motor, ball screw, and piston, along with dynamic seal leakage caused by the piston's reciprocating motion within the cylinder, prevents effective micro-flow control of the liquid. In addition, the counterpressure loading device is complex to install and disassemble, requires external sensors for measurement, involves numerous calibration procedures, and is susceptible to interference with loading accuracy, making it unsuitable for the demands of high-precision geotechnical testing.

[0004] Based on the above situation, there is an urgent need to provide a back pressure pump-controlled loading device for constant strain consolidation apparatus to improve the problems of limited loading pressure range, insufficient accuracy of small flow and pressure control, and complex installation, disassembly and calibration process of existing back pressure loading devices, thereby improving the stability and reliability of back pressure application and control in constant strain consolidation tests. Utility Model Content

[0005] Based on this, it is necessary to propose a constant strain consolidation apparatus back pressure pump-controlled loading device to address the above problems, in order to improve the existing back pressure loading devices' limited loading pressure range, insufficient accuracy in controlling small flow rates and pressures, and complex installation, disassembly, and calibration processes.

[0006] A back pressure pump-controlled loading device for a constant strain consolidation apparatus, used to apply back pressure to the consolidation chamber of a constant strain consolidation apparatus, comprising:

[0007] The drive mechanism includes a motor and a coupling connected to the output shaft of the motor;

[0008] A high-pressure, low-flow plunger pump is connected to the coupling.

[0009] The fluid connection assembly includes an inlet connector and an outlet connector. The inlet connector is connected to the suction end of the high-pressure micro-flow plunger pump and the other end is connected to the water supply end. One end of the outlet connector is connected to the discharge end of the high-pressure micro-flow plunger pump and the other end is connected to the consolidation box.

[0010] The control mechanism includes a pressure sensor and a circuit board. The circuit board is electrically connected to the pressure sensor and the motor. The pressure sensor is connected to the pipeline of the water outlet connector. The circuit board controls the motor to run according to the back pressure signal detected by the pressure sensor, thereby adjusting the pressure and flow rate of the water output by the high-pressure micro-flow plunger pump.

[0011] The motor drives the high-pressure micro-flow plunger pump through the coupling to output a steplessly adjustable high-pressure micro-flow water body. The high-pressure micro-flow water body is transported to the consolidation box through the water outlet connector to achieve back pressure loading control on the consolidation sample.

[0012] In at least one embodiment of this application, the fluid connection assembly further includes a mounting block and a valve body. The mounting block is sleeved on the outer periphery of the high-pressure micro-flow plunger pump at the end away from the coupling. The water inlet connector is disposed on the mounting block. The end of the high-pressure micro-flow plunger pump away from the coupling is connected to the valve body, and the water outlet connector is disposed on the valve body. The high-pressure micro-flow water is sequentially transported to the consolidation box through the valve body and the water outlet connector.

[0013] In at least one embodiment of this application, the detection port of the pressure sensor is connected to the channel between the discharge end of the high-pressure micro-flow plunger pump and the water outlet connector.

[0014] In at least one embodiment of this application, the valve body is a manual three-way valve, and the three-way valve is further provided with a drain port communicating with the water outlet connector.

[0015] In at least one embodiment of this application, there are multiple water inlet connectors, and the multiple water inlet connectors are arranged circumferentially on the mounting block.

[0016] In at least one embodiment of this application, the constant strain consolidation apparatus back pressure pump controlled loading device further includes a base and an electrical connector. The base is located at the end of the motor away from the coupling. The circuit board and the electrical connector are located on the base, and the circuit board is electrically connected to the electrical connector.

[0017] In at least one embodiment of this application, the motor is fixed to the top of the base by fasteners, and the coupling is connected to the output shaft of the motor and the drive shaft of the high-pressure micro-flow plunger pump, respectively.

[0018] In at least one embodiment of this application, the circuit board is detachably mounted on the side of the base away from the motor by four fasteners.

[0019] In at least one embodiment of this application, the motor is a servo motor.

[0020] In at least one embodiment of this application, a mounting hole is provided on the side plate of the base, and the electrical connector is disposed in the mounting hole.

[0021] The constant strain consolidation apparatus reverse pressure pump-controlled loading device of this embodiment will have at least the following beneficial effects:

[0022] The constant strain consolidation apparatus back pressure pump controlled loading device provided above has been successfully implemented.

[0023] A high-pressure micro-flow plunger pump is connected to a coupling, which in turn connects to the motor output shaft. The inlet connector is connected to the pump's suction end and the other end to the water supply end. One end of the outlet connector is connected to the pump's discharge end and the other end to the consolidation box. The circuit board is electrically connected to the pressure sensor and motor, and the pressure sensor is connected to the outlet connector's pipeline. The motor drives the high-pressure micro-flow plunger pump via the coupling to output a steplessly adjustable high-pressure micro-flow water volume. This high-pressure micro-flow water volume is delivered to the consolidation box through the outlet connector to achieve back pressure loading control of the consolidated sample. The pressure sensor detects the back pressure change on one side of the consolidation box in real time and feeds it back to the circuit board. Based on this, the circuit board performs closed-loop regulation of the motor's operating state, thereby achieving precise control of the pressure and flow rate of the water output by the high-pressure micro-flow plunger pump. This ensures that the back pressure loading process on the consolidated sample is continuous, stable, and steplessly adjustable. By using a motor-driven high-pressure micro-flow plunger pump to directly control the output of high pressure and low flow rate of the back pressure water body, the problem of insufficient water volume and low loading pressure caused by the limitation of piston cylinder length, volume and outer diameter is avoided. There is no need to configure an independent external calibration sensor and a complicated calibration procedure, which simplifies the installation and debugging process and reduces the possibility of the system being affected by external interference. This significantly improves the stability and reliability of back pressure application and control in constant strain consolidation tests and meets the application requirements of high-precision geotechnical tests. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] in:

[0026] Figure 1 This is a three-dimensional overall view of the back pressure pump controlled loading device of the constant strain consolidation apparatus in one embodiment;

[0027] Figure 2 An exploded perspective view of the back pressure pump-controlled loading device of a constant strain consolidation apparatus in one embodiment;

[0028] Figure 3 This is a top view of the back pressure pump-controlled loading device of the constant strain consolidation apparatus in one embodiment;

[0029] Figure 4 for Figure 3 A cross-sectional view of the PP section.

[0030] Explanation of reference numerals in the attached diagram:

[0031] 10. Constant strain consolidation apparatus back pressure pump controlled loading device; 100. Drive mechanism; 110. Servo motor; 120. Coupling; 200. High pressure micro-flow plunger pump; 300. Fluid connection assembly; 310. Mounting block; 311. Water inlet connector; 320. Valve body; 321. Water outlet connector; 410. Pressure sensor; 420. Circuit board; 500. Base; 510. Mounting hole; 600. Electrical connector. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] Please refer to Figures 1 to 4In one embodiment, a back pressure pump-controlled loading device 10 for a constant strain consolidation apparatus is provided, used to apply back pressure to the consolidation chamber of the constant strain consolidation apparatus. The device includes a drive mechanism 100, a high-pressure micro-flow plunger pump 200, a fluid connection assembly 300, and a control mechanism (not shown). The drive mechanism 100 includes a motor and a coupling 120 connected to the motor's output shaft. The high-pressure micro-flow plunger pump 200 is connected to the coupling 120. The fluid connection assembly 300 includes an inlet connector 311 and an outlet connector 321. The inlet connector 311 is connected to the suction end of the high-pressure micro-flow plunger pump 200, and the other end is connected to the water supply end. One end of the outlet connector 321 is connected to the discharge end of the high-pressure micro-flow plunger pump 200. One end is connected to the consolidation box, and the other end is connected to the consolidation box to apply back pressure to the water in the consolidation box. The control mechanism includes a pressure sensor 410 and a circuit board 420. The circuit board 420 is electrically connected to the pressure sensor 410 and the motor. The pressure sensor 410 is connected to the pipeline of the water outlet connector 321. The circuit board 420 controls the motor to run according to the back pressure signal detected by the pressure sensor 410, thereby adjusting the pressure and flow rate of the water output by the high-pressure micro-flow plunger pump 200. The motor drives the high-pressure micro-flow plunger pump 200 to output a steplessly adjustable high-pressure micro-flow water through the coupling 120. The high-pressure micro-flow water is delivered to the consolidation box through the water outlet connector 321 to achieve back pressure loading control for the consolidation sample.

[0034] Specifically, the drive shaft of the high-pressure micro-flow plunger pump 200 is connected to the coupling 120, so that when the motor runs, it drives the high-pressure micro-flow plunger pump 200 to perform reciprocating plunger motion through the coupling 120. One end of the water inlet connector 311 is connected to the suction end of the high-pressure micro-flow plunger pump 200, and the other end is connected to the water supply end to provide a stable water supply to the high-pressure micro-flow plunger pump 200; one end of the water outlet connector 321 is connected to the discharge end of the high-pressure micro-flow plunger pump 200, and the other end is connected to the consolidation box of the constant strain consolidation apparatus through a hose or rigid pipe, so that the water discharged by the high-pressure micro-flow plunger pump 200 directly enters the consolidation box to form a back pressure water body. The pressure sensor 410 can be installed on the water outlet pipe connected to the water outlet connector 321. Its detection port is connected to the channel between the discharge end of the high-pressure micro-flow plunger pump 200 and the solidification box. It is used to detect the back pressure signal on one side of the solidification box in real time. The circuit board 420 is electrically connected to the pressure sensor 410. After receiving the detection signal from the pressure sensor 410, it outputs a control signal to control the start and stop, speed and / or angle of the motor. With the above structure, when the constant strain consolidation test requires the application or adjustment of back pressure, the motor drives the high-pressure micro-flow plunger pump 200 under the control of the circuit board 420. The high-pressure micro-flow plunger pump 200 draws water from the water supply end through the water inlet connector 311 and delivers it to the consolidation box in the form of high-pressure micro-flow through the water outlet connector 321. The pressure sensor 410 detects the back pressure change on one side of the consolidation box in real time and feeds it back to the circuit board 420. The circuit board 420 adjusts the working state of the motor in a closed loop accordingly, thereby realizing the precise control of the pressure and flow rate of the water output by the high-pressure micro-flow plunger pump 200, so that the back pressure loading process of the consolidation sample is continuous, stable and steplessly adjustable.

[0035] It is important to understand that, compared with existing counter-pressure loading devices that use a stepper motor and ball screw to drive a piston cylinder to change volume, estimate volume changes by the number of steps, and rely on feedback from an external pressure sensor 410, this embodiment directly controls the high-pressure, low-flow output of the counter-pressure water by using a motor-driven high-pressure micro-flow plunger pump 200. This avoids the problems of insufficient water volume and low loading pressure in a single loading due to limitations in piston cylinder length, volume, and outer diameter, and is conducive to achieving wide-range, high-pressure counter-pressure loading. By arranging a pressure sensor 410 on the outlet pipe and using a circuit board 420 for real-time closed-loop control, there is no need to indirectly calculate volume changes by relying on the number of steps of the stepper motor. This reduces the impact of accumulated errors in the transmission chain such as the stepper motor, ball screw, and piston on control accuracy, enabling fine adjustment of the pressure and micro-flow of the counter-pressure water, and improving the insufficient liquid micro-flow control capability of existing devices. The back pressure loading process can be completed solely by the pressure detection and control of the device itself, without the need for additional independent external calibration sensors and complex calibration procedures. This simplifies the installation and debugging process, reduces the possibility of the system being affected by external interference, and thus significantly improves the stability and reliability of back pressure application and control in constant strain consolidation tests, meeting the application requirements of high-precision geotechnical tests.

[0036] Please refer to Figure 4 In one embodiment, the fluid connection assembly 300 further includes a mounting block 310 and a valve body 320. The mounting block 310 is sleeved on the outer periphery of the end of the high-pressure micro-flow plunger pump 200 away from the coupling 120. The inlet connector 311 is disposed on the mounting block 310. The end of the high-pressure micro-flow plunger pump 200 away from the coupling 120 is connected to the valve body 320, and the outlet connector 321 is disposed on the valve body 320. The high-pressure micro-flow water is sequentially transported to the consolidation box through the valve body 320 and the outlet connector 321.

[0037] Specifically, the mounting block 310 is fitted onto the outer periphery of the high-pressure micro-flow plunger pump 200 at the end furthest from the coupling 120. The inlet connector 311 is directly mounted on the mounting block 310, allowing the water supply to enter the mounting block 310 through the inlet connector 311 and then be introduced into the suction end of the high-pressure micro-flow plunger pump 200. The end of the high-pressure micro-flow plunger pump 200 furthest from the coupling 120 is connected to the valve body 320. The valve body 320 serves as the switching and control unit between the pump outlet side and the external pipeline. It is equipped with an outlet connector 321. During back pressure loading, the high-pressure micro-flow water output by the high-pressure micro-flow plunger pump 200 is sequentially transported to the consolidation box through the internal flow channel of the valve body 320 and the outlet connector 321 on the valve body 320. The valve body 320 is directly arranged at the pump body discharge end and integrally carries the water outlet connector 321, making the water path from the pump outlet to the solidification box continuous and compact, reducing intermediate connecting parts and sealing interfaces, facilitating centralized management of water outlet on / off and flow direction, thereby further improving the stability and controllability of the back pressure loading process, and improving the overall device's installation compactness and maintenance convenience.

[0038] Please refer to Figure 1 and Figure 4 In one embodiment, the detection port of the pressure sensor 410 is connected to the channel between the discharge end of the high-pressure micro-flow plunger pump 200 and the outlet connector 321.

[0039] Specifically, the detection port of the pressure sensor 410 is set in the channel between the discharge end of the high-pressure micro-flow plunger pump 200 and the water outlet connector 321, so that the pressure sensor 410 can directly sense the back pressure of the water body before it is delivered to the solidification box, thereby realizing the local and real-time monitoring of the actual back pressure state at the pump outlet.

[0040] Please refer to Figure 1 In one embodiment, the valve body 320 is a manual three-way valve, and the three-way valve is also provided with a drain port connected to the water outlet connector 321.

[0041] Specifically, valve body 320 is a manual three-way valve, and this three-way valve is equipped with a drain port connected to the outlet connector 321. The water discharged from the high-pressure micro-flow plunger pump 200 can be manually switched between "entering the solidification box through the outlet connector 321" and "discharging or returning water through the drain port" when passing through the three-way valve. By integrating the drain port on valve body 320, it is convenient to fill and vent the back pressure pipeline before the test, and to depressurize and drain the water after the test, avoiding frequent disassembly and assembly of the pipeline and simplifying the operation process.

[0042] Please refer to Figures 1 to 4 In one embodiment, there are multiple water inlet connectors 311, which are arranged circumferentially on the mounting block 310.

[0043] Specifically, multiple water inlet connectors 311 are provided and distributed circumferentially around the outer periphery of the mounting block 310, so that the suction end of the high-pressure micro-flow plunger pump 200 has multiple sets of water inlet interfaces in the circumferential direction. During installation, one or more of these locations can be selected for pipeline connection according to the location of the water supply end.

[0044] Please refer to Figure 4 In one embodiment, the constant strain consolidation apparatus back pressure pump controlled loading device 10 further includes a base 500 and an electrical connector 600. The base 500 is located at the end of the motor away from the coupling 120. The circuit board 420 and the electrical connector 600 are located on the base 500, and the circuit board 420 is electrically connected to the electrical connector 600.

[0045] Specifically, the base 500 is located at the end of the motor away from the coupling 120, and is used to provide overall support and positioning for the motor and its cooperating high-pressure micro-flow plunger pump 200 and other components. The circuit board 420 and the electrical connector 600 are uniformly arranged on the base 500. The circuit board 420 and the electrical connector 600 are electrically connected, so that external power supply cables and control cables can be centrally connected to the circuit board 420 through the electrical connector 600, so as to realize unified power supply and signal interaction for components such as the motor and pressure sensor 410.

[0046] It should be noted that the motor is a servo motor 110. During operation, the servo motor 110 can achieve closed-loop precise adjustment of speed, angle, and direction of rotation based on the control signal output from the circuit board 420, thereby driving the high-pressure micro-flow plunger pump 200 to output water according to a predetermined speed curve and displacement stroke. By using the servo motor 110 as the drive source, compared with the commonly used stepper motor drive method, the impact of motor microstepping loss and cumulative error on the accuracy of plunger reciprocating motion can be effectively reduced, significantly improving the resolution and stability of the back pressure water output pressure and micro-flow adjustment, making the response of the back pressure loading process faster and the control smoother. This is beneficial for obtaining high-precision and repeatable back pressure loading results in constant strain consolidation tests, further improving the overall control accuracy and test reliability of the device.

[0047] Please refer to Figure 4 In one embodiment, the motor is fixed to the top of the base 500 by fasteners, and the coupling 120 is connected to the output shaft of the motor and the drive shaft of the high-pressure micro-flow plunger pump 200, respectively. The circuit board 420 is detachably mounted on the side of the base 500 away from the motor by four fasteners. This facilitates precise adjustment of the relative position of the motor and pump shaft during assembly and maintenance, reduces installation deviations, and minimizes vibration, noise, and bearing wear caused by shaft misalignment, ensuring long-term stable operation of the high-pressure micro-flow plunger pump 200. Furthermore, it enables efficient and reliable transmission of drive torque to the pump body, which is beneficial for improving the operational stability and service life of the back-pressure pump control loading device under high-pressure, micro-flow conditions.

[0048] Please refer to Figure 4 In one embodiment, a mounting hole 510 is provided on the side plate of the base 500, and an electrical connector 600 is disposed in the mounting hole 510.

[0049] Specifically, mounting holes 510 are provided on the side plate of the base 500, and electrical connectors 600 are installed in these mounting holes 510. This allows the outer end of the electrical connector 600 to be easily connected to external cables from outside the base 500, while the inner end is electrically connected to the circuit board 420 located on the base 500. By embedding the electrical connector 600 in the mounting holes 510 of the side plate of the base 500, on the one hand, the interfaces of external power supply cables and signal cables can be concentrated on the side of the base 500, making it easier for operators to plug and unplug and wire during equipment installation and test setup, avoiding the mess and mechanical pulling caused by cables being directly introduced into the circuit board 420; on the other hand, the side plate of the base 500 provides a certain degree of support and protection for the electrical connector 600, which helps to improve the mechanical strength and impact resistance of the external electrical connection interface, reducing the risk of connector loosening, falling off, or becoming contaminated, thereby improving the electrical connection reliability and on-site ease of use of the constant strain consolidation apparatus back pressure pump controlled loading device 10.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A back pressure pump-controlled loading device for a constant strain consolidation apparatus, used to apply back pressure to the consolidation chamber of a constant strain consolidation apparatus, characterized in that, include: The drive mechanism includes a motor and a coupling connected to the output shaft of the motor; A high-pressure, low-flow plunger pump is connected to the coupling. The fluid connection assembly includes an inlet connector and an outlet connector. The inlet connector is connected to the suction end of the high-pressure micro-flow plunger pump and the other end is connected to the water supply end. One end of the outlet connector is connected to the discharge end of the high-pressure micro-flow plunger pump and the other end is connected to the consolidation box. The control mechanism includes a pressure sensor and a circuit board. The circuit board is electrically connected to the pressure sensor and the motor. The pressure sensor is connected to the pipeline of the water outlet connector. The circuit board controls the motor to run according to the back pressure signal detected by the pressure sensor, thereby adjusting the pressure and flow rate of the water output by the high-pressure micro-flow plunger pump. The motor drives the high-pressure micro-flow plunger pump through the coupling to output a steplessly adjustable high-pressure micro-flow water body. The high-pressure micro-flow water body is transported to the consolidation box through the water outlet connector to achieve back pressure loading control on the consolidation sample.

2. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 1, characterized in that, The fluid connection assembly further includes a mounting block and a valve body. The mounting block is sleeved on the outer periphery of the high-pressure micro-flow plunger pump at the end away from the coupling. The water inlet connector is disposed on the mounting block. The end of the high-pressure micro-flow plunger pump away from the coupling is connected to the valve body, and the water outlet connector is disposed on the valve body. The high-pressure micro-flow water is sequentially transported to the consolidation box through the valve body and the water outlet connector.

3. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 2, characterized in that, The detection port of the pressure sensor is connected to the channel between the discharge end of the high-pressure micro-flow plunger pump and the water outlet connector.

4. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 2 or 3, characterized in that, The valve body is a manual three-way valve, and the three-way valve is also provided with a drain port that is connected to the water outlet connector.

5. The constant strain consolidation apparatus reverse pressure pump controlled loading device according to claim 2, characterized in that, There are multiple water inlet connectors, which are arranged circumferentially on the mounting block.

6. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 1, characterized in that, The constant strain consolidation apparatus back pressure pump controlled loading device also includes a base and an electrical connector. The base is located at the end of the motor away from the coupling. The circuit board and the electrical connector are located on the base, and the circuit board is electrically connected to the electrical connector.

7. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 6, characterized in that, The motor is fixed to the top of the base by fasteners, and the coupling is connected to the output shaft of the motor and the drive shaft of the high-pressure micro-flow plunger pump respectively.

8. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 6, characterized in that, The circuit board is detachably mounted on the side of the base away from the motor via four fasteners.

9. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 1, characterized in that, The motor is a servo motor.

10. The constant strain consolidation apparatus back pressure pump controlled loading device according to claim 6, characterized in that, The base has mounting holes on its side plate, and the electrical connector is located in the mounting holes.

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