Device and method for detecting overturning and vibration of piston shoe, return plate and like of plunger pump

Abstract

The invention discloses a device and a method for detecting overturning and vibration of a piston shoe, a return plate and the like of a plunger pump, and relates to the technical field of high-pressure large-displacement closed plunger pumps. The overturning angle and the vibration state of the sliding shoe and the return plate can be accurately monitored in real time, dynamic changes in operation are directly captured by installing the vibration sensor and the angle sensor, and the problem that real-time measurement cannot be achieved in the prior art is solved. Meanwhile, by adjusting the extension length of the electric push rod and the rotating speed of the motor, the inclination angle, pressure and rotating speed parameters of the swash plate can be flexibly controlled, precise adjustment and control of postures of the sliding shoe and the return plate are achieved, and pump performance reduction and service life shortening caused by overturning vibration are avoided. In addition, the overturning angle and the vibration trend can be drawn into a visual change trend chart through the data processing step of the method, the influence rules under different working conditions can be analyzed conveniently, a reliable basis is provided for optimizing the design of the plunger pump, and finally the operation stability and reliability of the lifting pump under the high-pressure and large-displacement working conditions are achieved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure, high-displacement closed-loop piston pump technology, specifically to a device and method for detecting the overturning and vibration of piston pump slippers and return plates. Background Technology

[0002] High-pressure, high-displacement closed-circuit piston pumps are a type of hydraulic pump specifically designed for high-pressure, high-flow-rate applications. They achieve oil suction and pressure by changing the volume of the sealed working chamber through the reciprocating motion of the piston within the pump body. They are primarily used in hydraulic systems requiring high pressure and high flow rates, such as in construction machinery, shipbuilding, and petrochemical industries, playing a crucial role, especially in biopharmaceutical plants where continuous operation and stability are critical requirements.

[0003] In the operation of high-pressure, high-displacement closed-loop piston pumps, increasing the swashplate angle to meet the high displacement requirements significantly impacts pump performance and lifespan due to the overturning vibration of the slipper and return plate. However, existing technologies struggle to precisely control the attitude of the slipper and return plate, and cannot measure their overturning angle in real time. Furthermore, they cannot visually represent the changing trends of overturning vibration under different swashplate angles and rotational speeds. Therefore, we propose a device and method for detecting the overturning and vibration of the slipper and return plate in piston pumps. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art by providing a device and method for detecting overturning and vibration of plunger pump slippers and return plates.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] A device and method for detecting overturning and vibration of a plunger pump's slipper and return plate, the detection device comprising: an electric motor, the output shaft of which is driven by a drive shaft via a rigid coupling, a cylinder being driven by a cylinder body on the output side of the drive shaft, the cylinder body containing multiple springs and plungers, each plunger having a slipper connected to its tail via a ball joint, a return plate being connected to the outer side of the slipper, a swashplate being provided on the left side of the return plate, two pressure plates being mounted on the end of the swashplate near the return plate, the return plate being located between the two pressure plates, two pins being provided on the left side of the swashplate, wherein the swashplate is connected to an electric push rod via the upper pin, the electric push rod being mounted on a fixed seat, the swashplate being connected to a push rod via the lower pin, a rolling bearing being fitted onto the circumferential surface of the drive shaft away from the electric motor, and a base being connected to the left side of the rolling bearing.

[0007] Furthermore, the first end of the plunger abuts against the tail end of the spring, and the first end of the spring is fixedly installed inside the cylinder.

[0008] Furthermore, the cylinder body is arranged in a plum blossom shape, and a through hole is opened at the center of the cylinder body. A rectangular through groove is opened at the upper end of the through hole. A positioning block that matches the rectangular through groove is installed at the upper end of the drive shaft. The positioning block is inserted into the rectangular through groove.

[0009] Furthermore, a support is installed at the lower end of the motor, and a support seat for supporting the rigid coupling is installed at the upper left end of the support.

[0010] Furthermore, grooves are formed on the opposite surfaces of the two pressure plates, and the thickness of the grooves is consistent with the thickness of the return plate.

[0011] Furthermore, threaded holes are provided at the four corners of the swashplate, and threaded holes are provided at the upper and lower ends of each pressure plate in a concentric circle with the threaded holes. Bolts can be detachably installed in the threaded holes, and a through hole is provided at the center of the swashplate, with the inner diameter of the through hole being larger than the outer diameter of the drive shaft.

[0012] Furthermore, two symmetrically arranged connecting plates are installed on the upper left side of the swashplate, and the output shaft of the electric push rod is movably connected to the connecting plates via the pin. A connecting frame is installed on the lower left side of the swashplate, and the upper end of the push rod is movably connected to the connecting frame via the pin.

[0013] Furthermore, the base is L-shaped, the left side of the rolling bearing is inserted into the side plate above the base, and the lower end of the push rod is inserted into the upper end of the base.

[0014] A method for detecting overturning and vibration of plunger pump slippers and return discs, comprising the detection device described in any one of the above claims, including the following steps:

[0015] Step 1: Set experimental parameters: Simulate different pressures by adjusting the motor speed and the extension length of the electric push rod, and by replacing springs of different lengths and stiffnesses; control the pump speed, swashplate angle and pressure.

[0016] Step 2, Start the device: Open the electric push rod and extend it to a fixed length to fix the swashplate tilt angle. Install the vibration and angle sensors, turn on the motor, and start the closed-loop piston pump.

[0017] Step 3, Testing: After the closed-loop piston pump has been running stably for a certain period of time, read the data from the vibration and angle sensors to observe the changes in the overturning angle and vibration trend of the tested parts (slipper, return plate).

[0018] Step 4: Change parameters: Change the extension length of the electric actuator, the swashplate angle, and the motor speed;

[0019] Step 5: Test again: Repeat step 3 and record the changes in the overturning angle and vibration trend;

[0020] Step 6: Data Processing: Analyze the changes in overturning angle and vibration trend under different rotational speeds and swashplate tilt angles, and plot the trend graph.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention can more accurately test the overturning angle and vibration trend of the slipper and return plate during the operation of a high-pressure, high-displacement closed-loop piston pump; it solves the difficulty of real-time overturning and vibration measurement of the slipper and return plate during the operation of a high-pressure, high-displacement closed-loop piston pump; and it can intuitively reflect the motion change trend of the slipper and return plate under different swashplate angles and different speeds.

[0023] 2. This invention can monitor the overturning angle and vibration state of the swashplate and return plate in real time and with high precision. By installing vibration and angle sensors, it directly captures dynamic changes during operation, solving the problem of real-time measurement in existing technologies. Simultaneously, by adjusting the extension length of the electric push rod and the motor speed, the swashplate tilt angle, pressure, and speed parameters can be flexibly controlled, achieving precise regulation of the swashplate and return plate attitude, avoiding pump performance degradation and shortened lifespan caused by overturning vibration. Furthermore, the data processing steps of this method can plot the overturning angle and vibration trend into an intuitive trend graph, facilitating the analysis of the influence patterns under different operating conditions, providing a reliable basis for optimizing plunger pump design, and ultimately improving the pump's operational stability and reliability under high-pressure, high-displacement conditions. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0025] Figure 2 This is a front sectional view of the present invention;

[0026] Figure 3 This is a three-dimensional schematic diagram of the cylinder body in this invention;

[0027] Figure 4 This is a three-dimensional schematic diagram of the pressure plate in this invention;

[0028] Figure 5 This is a three-dimensional schematic diagram of the swashplate in this invention;

[0029] Figure 6 This is a flowchart of the method of the present invention.

[0030] Reference numerals: 1. Fixed base; 2. Electric push rod; 3. Rolling bearing; 4. Pin; 5. Return plate; 6. Piston; 7. Cylinder block; 8. Rigid coupling; 9. Electric motor; 10. Support seat; 11. Drive shaft; 12. Spring; 13. Slipper; 14. Pressure plate; 15. Swashplate; 16. Push rod; 17. Base. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Please see Figure 1 - Figure 5 This invention provides a device for detecting overturning and vibration of plunger pump slippers and return plates. The detection device includes: an electric motor 9, the output shaft of the electric motor 9 is connected to a drive shaft 11 via a rigid coupling 8, the output side of the drive shaft 11 is connected to a cylinder 7, the cylinder 7 is provided with multiple springs 12 and plungers 6, the tail of each plunger 6 is connected to a slipper 13 via a ball joint, the outer side of the slipper 13 is connected to a return plate 5, a swashplate 15 is provided on the left side of the return plate 5, two pressure plates 14 are installed on the end of the swashplate 15 near the return plate 5, and the return plate 5 is located between the two pressure plates 14, two pins 4 are provided on the left side of the swashplate 15, wherein the swashplate 15 is connected to an electric push rod 2 via the upper pin 4, the electric push rod 2 is mounted on a fixed seat 1, the swashplate 15 is connected to a push rod 16 via the lower pin 4, a rolling bearing 3 is sleeved on the circumferential surface of the drive shaft 11 away from the electric motor 9, and a base 17 is connected to the left side of the rolling bearing 3.

[0033] The electric motor 9 provides power to drive the drive shaft 11 to rotate, which in turn drives the cylinder 7 to rotate. The rotation of the cylinder 7 causes multiple springs 12 and pistons 6 inside to reciprocate. Each piston 6 acts on the return plate 5 via a ball joint-connected slipper 13. The return plate 5 is located between two pressure plates 14, and its movement is constrained by the swashplate 15. The swashplate 15 can be tilted at an adjustable angle via an electric push rod 2 connected to the upper pin 4, and a push rod 16 connected to the lower pin 4 provides auxiliary support to simulate different working conditions. The drive shaft 11 is supported by rolling bearings 3, and the base 17 ensures stable operation of the device. During operation, the overturning and vibration of the slipper 13 and the return plate 5 are monitored in real time by integrated sensors (such as accelerometers or displacement sensors). The data acquisition system records and analyzes abnormal signals to achieve efficient detection.

[0034] In this embodiment, preferably, the front end of the plunger 6 abuts against the rear end of the spring 12, and the front end of the spring 12 is fixedly installed inside the cylinder body 7. This arrangement can effectively buffer the impact force of the plunger 6 during reciprocating motion, ensuring that the front end of the plunger 6 and the rear end of the spring 12 are in close contact, thereby maintaining the relative position stability of the plunger 6 and the cylinder body 7. When the slipper 13 and the return plate 5 overturn or vibrate, this elastic structure can amplify the displacement change, making it easier to capture abnormal signals in real time through displacement sensors or vibration monitors, thus improving the sensitivity and reliability of the detection device. In addition, the preload of the spring 12 can adjust the return speed of the plunger 6, avoiding lag caused by inertia, further optimizing the measurement accuracy of the overturning angle and vibration frequency, and is suitable for monitoring the status of the plunger pump under different working conditions.

[0035] In this embodiment, preferably, the cylinder body 7 is arranged in a plum blossom shape, and a through hole is opened at the center of the cylinder body 7. A rectangular through groove is opened at the upper end of the through hole. A positioning block adapted to the rectangular through groove is installed at the upper end of the drive shaft 11, and the positioning block is inserted into the rectangular through groove. This arrangement can ensure the rigid connection between the drive shaft 11 and the cylinder body 7, prevent relative displacement or rotation during operation, and thus maintain the axial and radial positioning accuracy of the drive shaft 11. When the slipper 13 and the return plate 5 overturn or vibrate, the plum blossom-shaped cylinder body 7 design enhances the deformation resistance of the overall structure and effectively disperses stress concentration. At the same time, the cooperation between the rectangular through groove and the positioning block simplifies the assembly process, ensures the coaxiality of the cylinder body 7 and the drive shaft 11, and further improves the sensitivity and reliability of the detection device, making it suitable for monitoring the status of piston pumps under high speed or variable operating conditions.

[0036] In this embodiment, preferably, a support seat 10 is installed at the lower end of the motor 9, and a support seat for supporting the rigid coupling 8 is installed at the upper left end of the support seat 10. With the cooperation of the support seat and the support seat, the motor 9 and the rigid coupling 8 can be stably installed, effectively reducing the vibration transmission during operation and avoiding displacement or misalignment caused by external force interference. At the same time, this structure enhances the overall device's resistance to deformation and collects dynamic signals of the coupling area in real time, thereby improving the accuracy of overturning or vibration detection of the slipper 13 and the return plate 5. It is suitable for monitoring the status of piston pumps under high-speed operation or variable working conditions.

[0037] In this embodiment, preferably, the opposite surfaces of the two pressure plates 14 are provided with grooves, and the thickness of the grooves is consistent with the thickness of the return plate 5; thereby ensuring the stable clamping of the return plate 5 between the pressure plates 14, avoiding vibration or displacement caused by gaps during operation, effectively improving the sensitivity of capturing overturning or vibration signals of the slipper 13 and the return plate 5, and enhancing the overall structure's resistance to deformation by uniformly distributing the load, making it suitable for monitoring the status of piston pumps under high speed or variable operating conditions.

[0038] In this embodiment, preferably, threaded holes are provided at the four corners of the swashplate 15, and threaded holes concentric with the threaded holes are provided at the upper and lower ends of each pressure plate 14. Bolts are detachably installed in the threaded holes, and a through hole is provided at the center of the swashplate 15, with the inner diameter of the through hole being larger than the outer diameter of the drive shaft 11. The above configuration ensures precise alignment between the pressure plate 14 and the swashplate 15, effectively eliminating assembly gaps and avoiding abnormal vibrations or displacements caused by loosening during high-speed operation. At the same time, the detachable bolts facilitate maintenance and adjustment. The above structure synergistically enhances the clamping stability of the return plate 5, greatly improves the detection sensitivity of the slipper 13 overturning and vibration signals, and further strengthens the overall anti-deformation capability by uniformly distributing dynamic loads, ensuring the reliability of the plunger pump's condition monitoring under high speed and variable operating conditions.

[0039] In this embodiment, preferably, two symmetrically arranged connecting plates are installed on the upper left side of the swashplate 15. The output shaft of the electric push rod 2 is connected to the connecting plates via pin 4. A connecting frame is installed on the lower left side of the swashplate 15, and the upper end of the push rod 16 is connected to the connecting frame via pin 4. This allows for precise adjustment of the tilt angle of the swashplate 15, achieving smooth displacement control through the movable connection, avoiding additional vibration or offset caused by connection gaps, thereby improving the sensitivity and reliability of capturing overturning and vibration signals of the slipper 13 and return plate 5.

[0040] In this embodiment, preferably, the base 17 is L-shaped, with the left side of the rolling bearing 3 inserted into the side plate above the base 17, and the lower end of the push rod 16 inserted into the upper end of the base 17. This provides a stable support reference, avoiding additional vibration or offset caused by loosening of the base 17, thereby ensuring the smoothness and linear accuracy of the vertical movement of the push rod 16.

[0041] Working principle and usage process of this invention:

[0042] During operation, the device is first installed on the test platform using the fixed base 1, ensuring that the base 17 firmly supports the rolling bearing 3 and the drive shaft 11. The motor 9 is started, and its output shaft drives the drive shaft 11 to rotate via the rigid coupling 8. The drive shaft 11 drives the cylinder 7 to rotate synchronously. The rotation of the cylinder 7 causes multiple internal springs 12 and plungers 6 to reciprocate. The tail end of the spring 12 abuts against the head end of the plunger 6, effectively buffering the impact force and maintaining positional stability, while simultaneously amplifying the displacement changes of the slipper 13 and the return plate 5. The plunger 6 pushes the slipper 13 through a ball joint, and the slipper 13 acts on the return plate 5. The return plate 5 moves under the clamping of the grooves of the two pressure plates 14 and is constrained by the swashplate 15. The tilt angle of the swashplate 15 can be adjusted by the electric push rod 2 (pusor 16 provides auxiliary support), simulating load changes under different working conditions. During operation, sensors (such as accelerometers or displacement sensors) integrated near the slipper 13 and return plate 5 capture overturning and vibration signals in real time; the data acquisition system records parameters such as displacement and frequency, and detects anomalies (such as excessive displacement or abnormal spectrum) through analysis software. The support 10 and the base reduce vibration transmission between the motor 9 and the rigid coupling 8, and the plum blossom-shaped cylinder 7 enhances its resistance to deformation, ensuring detection accuracy. After the test, the motor 9 is turned off, the data is analyzed to evaluate the condition of the plunger pump, and if necessary, the angle of the pressure plate 14 or swashplate 15 is adjusted using removable bolts for maintenance and repeated testing.

[0043] Please see Figure 6 The present invention also provides a method for detecting overturning and vibration of plunger pump slippers and return discs, including the detection device described above, comprising the following steps:

[0044] Step 1: Set experimental parameters: By adjusting the speed of the motor 9 and the extension length of the electric push rod 2, and by replacing springs 12 of different lengths and stiffnesses to simulate different pressures, the pump speed, swashplate angle and pressure are controlled.

[0045] Step 2, Start the device: Open the electric push rod 2 and extend it to a fixed length so that the swashplate 15 is fixed at the tilt angle. Install the vibration and angle sensors, and turn on the motor 9 so that the closed plunger pump starts to rotate.

[0046] Step 3, Testing: After the closed-loop piston pump has been running stably for a certain period of time, read the data from the vibration and angle sensors to observe the changes in the overturning angle and vibration trend of the tested parts (slipper 13, return plate 5).

[0047] Step 4: Change parameters: Change the extension length of electric actuator 2, the tilt angle of swashplate 15, and the speed of motor 9;

[0048] Step 5: Test again: Repeat step 3 and record the changes in the overturning angle and vibration trend;

[0049] Step 6: Data Processing: Analyze the changes in overturning angle and vibration trend under different rotational speeds and swashplate tilt angles, and plot the trend graph.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for detecting overturning and vibration of the plunger pump's slipper and return plate, characterized in that, The detection device includes: an electric motor (9), the output shaft of which is connected to a drive shaft (11) via a rigid coupling (8), the output side of which is connected to a cylinder (7), the cylinder (7) having multiple springs (12) and plungers (6) inside, each plunger (6) having a slipper (13) connected to its tail via a ball joint, a return plate (5) connected to the outside of the slipper (13), a swashplate (15) on the left side of the return plate (5), and two... A pressure plate (14) is provided, and the return plate (5) is located between the two pressure plates (14). Two pins (4) are provided on the left side of the swashplate (15). The swashplate (15) is connected to an electric push rod (2) through the upper pin (4). The electric push rod (2) is mounted on a fixed seat (1). The swashplate (15) is connected to a push rod (16) through the lower pin (4). A rolling bearing (3) is sleeved on the circumferential surface of the drive shaft (11) away from the motor (9). A base (17) is connected to the left side of the rolling bearing (3).

2. The device for detecting overturning and vibration of the plunger pump slipper and return plate according to claim 1, characterized in that, The first end of the plunger (6) abuts against the tail end of the spring (12), and the first end of the spring (12) is fixedly installed inside the cylinder (7).

3. The device for detecting overturning and vibration of the plunger pump slipper and return plate according to claim 1, characterized in that, The cylinder body (7) is arranged in a plum blossom shape, and a through hole is provided at the center of the cylinder body (7). A rectangular through groove is provided at the upper end of the through hole. A positioning block that matches the rectangular through groove is installed at the upper end of the drive shaft (11). The positioning block is inserted into the rectangular through groove.

4. The device for detecting overturning and vibration of the plunger pump slipper and return plate according to claim 1, characterized in that, The lower end of the motor (9) is equipped with a support (10), and the upper left end of the support (10) is equipped with a support for supporting the rigid coupling (8).

5. The device for detecting overturning and vibration of the plunger pump slipper and return plate according to claim 1, characterized in that, The two pressure plates (14) have grooves on their opposite sides, and the thickness of the grooves is consistent with the thickness of the return plate (5).

6. The device for detecting overturning and vibration of the plunger pump slipper and return plate according to claim 1, characterized in that, The swash plate (15) has threaded holes at its four corners. Each pressure plate (14) has threaded holes at its upper and lower ends that are concentric with the threaded holes. Bolts can be detachably installed in the threaded holes. A through hole is provided at the center of the swash plate (15), and the inner diameter of the through hole is larger than the outer diameter of the drive shaft (11).

7. The device for detecting overturning and vibration of the plunger pump slipper and return plate according to claim 1, characterized in that, Two symmetrically arranged connecting plates are installed on the upper left side of the swashplate (15). The output shaft of the electric push rod (2) is connected to the connecting plates by means of the pin (4). A connecting frame is installed on the lower left side of the swashplate (15). The upper end of the push rod (16) is connected to the connecting frame by means of the pin (4).

8. The device for detecting overturning and vibration of the plunger pump slipper and return plate according to claim 1, characterized in that, The base (17) is L-shaped, the left side of the rolling bearing (3) is inserted into the side plate above the base (17), and the lower end of the push rod (16) is inserted into the upper end of the base (17).

9. A method for detecting overturning and vibration of plunger pump slippers and return discs, comprising the detection device according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Set experimental parameters: By adjusting the speed of the motor (9) and the extension length of the electric push rod (2), and by replacing springs (12) of different lengths and stiffnesses to simulate different pressures, control the pump speed, swashplate angle and pressure. Step 2, Start the device: Open the electric push rod (2) and extend it to a fixed length so that the tilt angle of the swashplate (15) is fixed. Install the vibration and angle sensors, turn on the motor (9) so that the closed plunger pump starts to rotate. Step 3, Test: After the closed-loop piston pump has been running stably for a certain period of time, read the data from the vibration and angle sensors and start to observe the changes in the overturning angle and vibration trend of the tested parts (slipper (13) and return plate (5)); Step 4: Change parameters: Change the extension length of the electric actuator (2), the tilt angle of the swashplate (15), and the speed of the motor (9); Step 5: Test again: Repeat step 3 and record the changes in the overturning angle and vibration trend; Step 6: Data Processing: Analyze the changes in overturning angle and vibration trend under different rotational speeds and different swashplate tilt angles, and draw a trend graph.

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