Plunger pump sliding shoe abrasion loss monitoring mechanism and plunger pump

Abstract

The invention discloses a plunger pump sliding shoe abrasion loss monitoring mechanism and a plunger pump, and relates to the technical field of plunger pump application. The plunger pump comprises a sliding shoe, and a swash plate, a thrust plate, a return plate and a plunger which are sequentially arranged along the axial direction of the main shaft; a sliding shoe hole is formed in the return plate, the sliding shoe penetrates through the sliding shoe hole, one side of the sliding shoe is connected to the plunger, and the other side of the sliding shoe is slidably connected to the plane of one side of the thrust plate under the action of the return plate. The sliding shoe abrasion loss monitoring mechanism comprises a processor, a signal generating device and a sensor, wherein the signal generating device and the sensor are matched with each other. The signal generating device is installed on the side, close to a plunger, of a return plate. The processor is installed between the thrust plate and the swash plate, and the abrasion loss of the sliding shoe is calculated by monitoring the variable quantity of signals sent by the signal generator in real time through the sensor. Interference of all parts in the running process of the sliding shoe can be avoided, the machining difficulty is low, and the abrasion loss of the sliding shoe can be monitored in time.

Description

TECHNICAL FIELD

[0001] The present application relates to a plunger pump, in particular to a plunger pump sliding shoe wear amount monitoring mechanism and a plunger pump. BACKGROUND

[0002] Sliding shoes are commonly used in various pistons or pump bodies, and in various application environments, the main role of the sliding shoe is to serve as a device for moving or supporting through sliding or reducing friction. In the normal use of the plunger pump, as the use time increases, the thickness of the sliding shoe will gradually decrease due to friction between the contact surfaces, and the plunger pump will fail when the thickness of the sliding shoe decreases beyond a threshold value. In the current design, in order to avoid failure of the plunger pump in operation, the existing work process is: after the plunger pump is used for a certain period of time, the plunger pump needs to be disassembled for maintenance to check the thickness of the sliding shoe. This method not only needs to frequently stop the plunger pump for disassembly and inspection, but also needs to consume labor, and even if the plunger pump is disassembled and inspected regularly to check the thickness of the sliding shoe, since the transition period from stable wear to failure of the sliding shoe is only a few hours, it is also possible that the maintenance is not timely. It can be seen that the prior art cannot capture the failure of the sliding shoe, so as to determine whether the sliding shoe of the plunger pump enters the failure period during operation, which may cause a sudden change in the working state of the plunger pump, and may easily cause a safety accident. SUMMARY

[0003] The purpose of the present application is to provide a plunger pump sliding shoe wear amount monitoring mechanism and a plunger pump, which can achieve real-time monitoring of the wear amount of the sliding shoe through a sensor and a signal generating device.

[0004] To solve the above technical problems, the present application is realized by the following technical scheme.

[0005] On the one hand, the present application provides a plunger pump sliding shoe wear amount monitoring mechanism, which comprises a sliding shoe 9, and a swash plate 7, a thrust plate 8, a return plate 10 and a plunger 13 arranged in sequence along the axis of a main shaft 1; the return plate is provided with a sliding shoe hole, and the sliding shoe passes through the sliding shoe hole, one side of the sliding shoe is connected to the plunger, and the other side is connected to the side plane of the thrust plate under the action of the return plate 10;

[0006] The sliding shoe wear amount monitoring mechanism comprises a processor, a signal generating device 16 and a sensor 4 which are adapted to each other, and a wear amount monitoring result output device; the signal generating device 16 is installed on one side of the return plate 10 close to the plunger 13; the processor and the sensor 4 are installed between the thrust plate and the swash plate; the output end of the sensor and the input end of the wear amount monitoring result output device are respectively connected to the processor in communication.

[0007] Optionally, the swash plate 7 is provided with a containing groove for installing the sensor 4 and the processor, and the sensor and the processor are fixedly installed in the containing groove.

[0008] The sensor, the processor and the wear amount monitoring result output device are arranged in the accommodating groove of the swash plate, the sliding shoe wear amount monitoring mechanism is more compact, movement interference is avoided, and the safety of the sliding shoe wear amount monitoring mechanism in the working state is improved.

[0009] Optionally, the swash plate comprises a third sealing member 6 for closing the accommodating groove.

[0010] The accommodating groove and the third sealing member 6 are annularly matched, and the inner circumferential parts and the outer circumferential parts of the two are respectively sealed and connected through sealing rings.

[0011] The third sealing member closes the accommodating groove, avoids interference from external factors, improves the accuracy of sensor detection, and makes the sliding shoe wear amount calculation more accurate.

[0012] Optionally, the sensors are circumferentially distributed in the accommodating groove of the swash plate.

[0013] The sensors are circumferentially distributed in the accommodating groove, ensuring that the signal generator signals measured by each sensor are the same during the working process of the plunger pump, and avoiding the existence of sensor measurement signal deviation due to different distribution positions.

[0014] Optionally, the signal generating device 16 adopts a permanent magnet, and the sensor 4 is a matched magnetic sensor.

[0015] The permanent magnet does not need to provide energy, has strong anti-interference ability, is low in price, is convenient for cost reduction, and has a simpler installation structure.

[0016] Optionally, the number of permanent magnets is multiple, and the multiple permanent magnets are uniformly distributed in the circumferential direction on the side of the return plate 10 close to the plunger 13, so that the magnetic field signals are uniformly generated.

[0017] Uniform distribution of the permanent magnets in the circumferential direction can effectively improve the stability of the signals received by the sensors; and ensure the smoothness of the sensor measurement data during the working process of the plunger pump.

[0018] Optionally, a permanent magnet is arranged between any two sliding shoe holes on the return plate, and each permanent magnet is fixedly installed on the return plate through a fastening screw.

[0019] The permanent magnet is located between any two sliding shoe holes, ensuring that data can be accurately collected and avoiding errors due to distance.

[0020] Optionally, the wear amount monitoring result output device comprises a wireless communication module, and the processor transmits the collected magnetic field signals or the sliding shoe wear amount and / or sliding shoe wear alarm signal determined according to the magnetic field signals to the outside through the wireless communication module.

[0021] The wireless communication module simplifies the installation structure and avoids motion interference caused by wired connection.

[0022] Optionally, the wear amount monitoring result output device further comprises a wear alarm, a control end of which is connected to the processor, for receiving a sliding shoe wear alarm instruction and outputting a sliding shoe wear alarm signal.

[0023] The wear alarm can timely alarm when the sliding shoe wear amount exceeds the set threshold, improving the safety performance of the equipment.

[0024] In another aspect, the application provides a plunger pump with the plunger pump sliding shoe wear amount monitoring mechanism according to any one of claims 1 to 9.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] The application maps the change of the sliding shoe wear amount to the signal change received by the sensor through the cooperation of the sensor and the signal generating device, realizes the real-time monitoring of the sliding shoe wear amount, and the processor can accurately calculate the sliding shoe wear amount according to the sensor unit input signal, ensuring the accuracy and immediacy of the sliding shoe wear amount observation, timely observing the sliding shoe state, and improving the safety performance of the plunger pump.

[0027] The signal generating device is installed on the side of the return disc close to the plunger, so that the processing difficulty is lower, and motion interference between the parts during the movement of the plunger pump can be avoided; the sliding shoe is connected to the thrust plate through the downward sliding of the return disc, reducing the sliding shoe wear efficiency; the processor is installed between the swash plate and the thrust plate, so that the plunger pump sliding shoe wear amount monitoring mechanism is more compact, the application improves the continuity and stability of the product, and the monitoring of the sliding shoe wear amount can be completed without disassembling the plunger pump. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 1 is a structural schematic diagram of a plunger pump with a plunger pump sliding shoe wear amount monitoring mechanism;

[0029] Figure 2 Fig. 3 is a schematic diagram of a containing groove opened in a swash plate;

[0030] Figure 3 Fig. 5 is a schematic diagram of a swash plate and a thrust plate cooperation structure;

[0031] Figure 4 Fig. 7 is a structural schematic diagram of a return disc;

[0032] Figure 5 Fig. 9 is a structural schematic diagram of a swash plate, a thrust plate, a sliding shoe and a return disc cooperation structure;

[0033] Figure 6 Fig. 11 is a flowchart for realizing real-time monitoring of the sliding shoe wear amount;

[0034] In the drawings: 1, main shaft; 2, first bearing; 3, mounting seat; 4, sensor; 5, first sealing ring; 6, third sealing member; 7, swash plate; 8, thrust plate; 9, sliding shoe; 10, return plate; 11, spherical hinge; 12, cylinder body; 13, plunger; 14, distribution plate; 15, small bearing; 16, signal generator; 17, first fastening screw; 18, compression spring; 19, second fastening screw; 20, second sealing ring. DETAILED DESCRIPTION

[0035] The application will be further described below in conjunction with the drawings. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0036] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0037] In the description of the present application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0038] Example one

[0039] The present embodiment provides a plunger pump sliding shoe wear amount monitoring mechanism, as shown in the figure, the plunger pump includes a sliding shoe 9, and a swash plate 7, a thrust plate 8, a return plate 10 and a plunger 13 arranged in sequence along the axial direction of the main shaft 1. Figure 1 As shown in the figure, the plunger pump includes a sliding shoe 9, and a swash plate 7, a thrust plate 8, a return plate 10 and a plunger 13 arranged in sequence along the axial direction of the main shaft 1.

[0040] As shown in the figure, the plunger pump includes a sliding shoe 9, and a swash plate 7, a thrust plate 8, a return plate 10 and a plunger 13 arranged in sequence along the axial direction of the main shaft 1. Figure 5As shown, the return disc is provided with a sliding shoe hole, and the sliding shoe passes through the sliding shoe hole and is connected to the plunger at one side and is connected to the one side plane of the thrust plate under the action of the return disc 10.

[0041] The sliding shoe wear amount monitoring mechanism comprises a processor, a signal generating device 16 and a sensor 4, and a wear amount monitoring result output device; the signal generating device 16 is installed on one side of the return disc 10 close to the plunger 13, is used for emitting signals and avoiding the installation interference on the contact surface of the return disc and the sliding shoe, and improves the safety of the sliding shoe wear amount monitoring mechanism; the sensor and the processor are installed between the thrust plate and the swash plate, so that the plunger pump structure is more compact; the output end of the sensor and the input end of the wear amount monitoring result output device are respectively connected to the processor in communication, so as to calculate the sliding shoe wear amount by receiving the change amount of the signals of the sensor, and realize the real-time monitoring of the sliding shoe wear amount.

[0042] As shown in Figure 4 The return disc 10 is provided with a sliding shoe hole on the surface, and the number of the sliding shoe holes is adjusted according to the plunger of the piston device; the sliding shoe 9 is connected to the piston device through the sliding shoe hole; the signal generating device 16 is installed on one side of the plunger of the return disc, so as to avoid the interference of each component caused by the installation on the contact surface of the sliding shoe and the return disc.

[0043] As shown in Figure 5 The sliding shoe is installed on the plane of the thrust plate through the return disc, the sensor 4 and the processor cooperating with the signal generating device 16 are installed between the swash plate and the thrust plate, the installation position of the sensor 4 ensures the high-precision cooperation of the sliding shoe 9 and the thrust plate 8, avoids the motion interference between each component, prevents the position interference of the sensor from interfering with the normal work of the sliding shoe, and can ensure the timely monitoring of the sliding shoe when the sliding shoe changes and reduces the unnecessary calculation distance, so as to more accurately monitor the wear amount change of the sliding shoe. The sensor is connected to the processor in communication, the processor calculates the wear amount of the sliding shoe by monitoring the signal change of the signal generating device, the processor is connected to the wear amount monitoring result output device, the processor can be installed in the swash plate, and the calculated wear amount of the sliding shoe is fed back to the wear amount monitoring result output device.

[0044] In summary, the plunger pump sliding shoe wear amount monitoring mechanism provided by the embodiment can monitor the sliding shoe amount change in real time through the signal generating device 16 and the sensor 4, saves the original cumbersome process of disassembling the pump body for maintenance to check the sliding shoe thickness, improves the safety performance of the plunger pump by monitoring the sliding shoe state in real time, and ensures the stable operation of the plunger pump. The sensor is installed between the swash plate and the thrust plate, occupies a small space, and has a more compact structure to avoid motion interference. The signal generating device cooperating with the sensor is installed on the return plate close to the piston device side, so that the installation of the plunger pump is easier, the sliding shoe and the thrust plate can be matched with high precision without motion interference, and the service life of the plunger pump is improved. The change of the sliding shoe wear amount is mapped to the signal change received by the sensor, so that the real-time monitoring of the sliding shoe wear amount is realized; the processor can accurately calculate the sliding shoe wear amount according to the sensor unit input signal, timely observe the sliding shoe state, and improve the safety performance of the plunger pump; and the above installation position can reduce the processing difficulty and reduce the maintenance and manufacturing cost.

[0045] Embodiment Two

[0046] The embodiment provides a plunger pump, and in the embodiment, as shown in Figure 2 The swash plate plane is provided with a containing groove for installing the sensor, so that the structure of the plunger pump is more compact, and motion interference is prevented. The swash plate 7 is provided with a screw hole matched with the second fastening screw 19 in the containing groove, and the sensor can be fixed in the containing groove of the swash plate 7 through the second fastening screw 19. The swash plate is fixedly installed on the mounting seat, so that the swash plate is more firm, and the performance of the plunger pump is more reliable.

[0047] The surface of the return plate close to the plunger side is provided with a positioning hole for cooperating with the first fastening screw 17. The signal generating device matched with the sensor can be fixed on the back surface of the sliding shoe hole interval of the cooperation surface of the return plate 10 and the sliding shoe 9 through the first fastening screw 17, so that when the sliding shoe wear amount changes, the position of the signal generator can also change in time. The sliding shoe holes provided on the surface of the return plate are uniformly distributed in the circumferential direction, so that the error phenomenon is avoided, and the stability of the sliding shoe wear amount monitoring is improved. However, the sensor can also be fixed in the containing groove of the swash plate through welding or pasting; the signal generating device can also be fixed on the return plate through welding or pasting; and the signal generating device 4 can also be fixed at a position away from the edge side of the sliding shoe hole of the cooperation surface of the return plate 10 and the sliding shoe 9.

[0048] In the embodiment, the reset device further includes a compression spring, the piston device is provided with a spring limiting hole for cooperating with the compression spring, and the compression spring 18 is used for tightly pressing the sliding shoe 9 on the plane of the thrust plate 8, so that the sliding shoe wear efficiency is reduced; as Figure 1As shown, one end of the compression spring is installed in the limiting hole of the piston device, and the other end is installed on the bottom surface of the ball joint 11. The ball joint is used to connect the return plate to ensure a stable connection between the return plate and the slipper. Under the pressure of the compression spring, the slipper 9 is pressed tightly against the plane of the thrust plate 8. However, it is not limited to this. The compression spring can be replaced by a gas spring or the like. Users can switch according to different working environment requirements to ensure that the slipper is pressed tightly against the plane of the thrust plate during the operation of the piston pump, thereby improving the stability of the system and reducing the wear efficiency of the slipper through the thrust plate 8.

[0049] In this embodiment, the swash plate has multiple seals. The receiving groove has an installation groove for fitting the first sealing ring 5 and the second sealing ring 20. The third sealing element 6 is an annular ring that is matched with the receiving groove. The first sealing ring 5, the second sealing ring 20, and the third sealing element 6 seal the sensor within the receiving groove. (Reference) Figure 3 A first seal 20 is installed on the inner side of the sensor circumference near the center hole of the swashplate, and a second seal 5 is installed on the side of the sensor away from the center hole. The first sealing ring 5 and the second sealing ring 20, and the third seal 6 are sealing baffles. Figure 3 As shown, the sensor is sealed with two O-rings and a sealing baffle, which improves the sensor's anti-interference ability and avoids interference from external factors, improves the accuracy of sensor detection, makes the calculation of slipper wear more accurate, and extends service life.

[0050] In this embodiment, the signal generating device 16 can be a permanent magnet. Permanent magnets require no energy supply, have strong anti-interference capabilities, are inexpensive, facilitate cost reduction, and have a simpler installation structure. The sensor 4 is a Hall sensor that works in conjunction with the permanent magnet; for example... Figure 4 As shown, when the plunger pump uses nine slippers 9, the thickness change of the slippers can be monitored in real time by using nine uniformly distributed permanent magnets along the circumferential direction installed between adjacent slipper holes on the surface of the return plate 10, in conjunction with four Hall sensors. The uniform distribution of the permanent magnets along the circumferential direction can effectively improve the stability of the signals received by the sensors, ensuring the stability of the sensor measurement data during the operation of the plunger pump. The sensors are distributed along the circumference in the receiving groove, ensuring that the signal generator signal measured by each sensor is the same during the operation of the plunger pump, avoiding deviations in the sensor measurement signals due to different distribution positions.

[0051] Specifically: such as Figure 2 As shown, a receiving groove is opened at the plane of the swashplate, such as... Figure 3 As shown, a sealing baffle and two O-rings are used for sealing. Sensors and processors can be installed within the receiving groove. The return plate has nine circumferentially arrayed slipper holes. Under the force of the compression spring, the return plate presses the slippers tightly against the thrust plate, as shown. Figure 3The shown thrust plate is movably mounted on the sealing baffle surface of the swash plate, and the thrust plate is used to reduce the friction loss of the shoe and improve the service life of the shoe. The other end of the shoe passes through the shoe hole of the return disc and is connected with the plunger. The back surface of the return disc and the shoe cooperation surface is provided with nine permanent magnets arranged in a uniform circumferential array. The permanent magnets are between two adjacent shoes. As the thickness of the shoe decreases, the permanent magnets are close to the sensor to cause a change in the magnetic field, which is captured by the sensor. The processor processes and calculates the electrical signal output by the sensor to determine whether the wear of the shoe has reached the critical value. Optionally, the signal generating device 16 can also select an electromagnet or soft magnetic material. The sensor 4 can also select a giant magnetoresistance sensor according to the measurement requirements and application scenarios.

[0052] In this embodiment, as shown in the figure Figure 1 The plunger pump main shaft 1 is also provided with a first bearing 2 and a second bearing 15. The first bearing is in abutment with the bottom surface of the mounting seat 3. The second bearing is in abutment with the surface of the distribution disc away from the cylinder body. The first bearing 2 is in interference fit with the main shaft 1. The second bearing 15 is in interference fit with the main shaft 1.

[0053] In some embodiments, as shown in the figure Figure 1 The piston device includes a cylinder body 12, a plunger 13, and a distribution disc 14. The cylinder body 12 is centrally provided with a through hole for fitting the main shaft. The cylinder body 12 is provided with a plunger cavity at the top for mounting the plunger 13. The bottom of the rod body is connected with the distribution disc 14. The bottom of the cylinder body is also provided with an oil distribution hole for adapting the work of the distribution disc. The oil distribution hole is connected with the inner cavity of the cylinder body. The distribution disc assists the reciprocating movement of the plunger, improving the operation efficiency of the plunger pump. The plunger is used to connect the shoe.

[0054] Working principle:

[0055] Referring to Figure 6 In the working process of the plunger pump, the permanent magnets are on the side of the return disc close to the plunger. As the thickness of the shoe decreases, the permanent magnets are close to the magnetic sensor to cause a change in the magnetic field, which is captured by the sensor. The processor processes and calculates the electrical signal output by the sensor. The processor can adopt a PCL or a single-chip microcomputer processing unit. In this embodiment, a PLC is adopted. Thus, it is determined whether the wear of the shoe has reached the critical value. The wear amount monitoring result output device also includes a wear alarm. The control end of the wear alarm is connected with the processor, which is used to receive the shoe wear alarm instruction and output the shoe wear alarm signal. After reaching the critical value, the processor sends the shoe alarm instruction to the control end of the wear alarm. The wear alarm will send the wear alarm signal to avoid the shoe from working after failure, improving the safety performance of the plunger pump. After reaching the critical value, the alarm can be triggered according to the application requirements. The current state of the shoe is displayed through the wear amount monitoring result output device, improving the continuity and stability of the product. The wear amount of the shoe can be monitored without disassembling the plunger pump.

[0056] The wear amount monitoring result output device comprises a wireless communication module, and the processor transmits the collected magnetic field signal or the shoe wear amount and / or shoe wear alarm signal determined according to the magnetic field signal to the outside through the wireless communication module, thereby simplifying the installation process and preventing motion interference caused by wired connection.

[0057] The wear alarm has a control end connected to the processor and is used for receiving the shoe wear alarm instruction and outputting the shoe wear alarm signal; and the wear amount monitoring result output device can also be installed in the accommodating groove of the swash plate.

[0058] The above description is only preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A plunger pump slipper wear monitoring mechanism, characterized in that, The plunger pump comprises a sliding shoe (9), and a swash plate (7), a thrust plate (8), a return plate (10) and a plunger (13) arranged in sequence along the main shaft (1) in the axial direction; the return plate is provided with a sliding shoe hole, the sliding shoe passes through the sliding shoe hole, one side of the sliding shoe is connected to the plunger, and the other side is slidably connected to one side of the thrust plate under the action of the return plate (10); The sliding shoe wear amount monitoring mechanism comprises a processor, a signal generating device (16) and a sensor (4) matched with the processor, and a wear amount monitoring result output device; the signal generating device (16) is installed on one side of the return plate (10) close to the plunger (13); the processor and the sensor (4) are installed between the thrust plate and the swash plate; the output end of the sensor and the input end of the wear amount monitoring result output device are respectively connected to the processor in communication.

2. The plunger pump shoe wear monitoring mechanism of claim 1, wherein, The swash plate (7) is provided with a containing groove for installing the sensor (4) and the processor, and the sensor (4) and the processor are fixedly installed in the containing groove.

3. The plunger pump shoe wear monitoring mechanism of claim 2, wherein, The swash plate comprises a third sealing member (6) for sealing the containing groove; The containing groove and the third sealing member (6) are annularly matched, and the inner circumferential portions and the outer circumferential portions between the containing groove and the third sealing member (6) are respectively sealed and connected by a second sealing ring (20) and a first sealing ring (5).

4. The plunger pump shoe wear monitoring mechanism of claim 2, wherein, The sensor is circumferentially distributed in the containing groove of the swash plate.

5. The plunger pump shoe wear monitoring mechanism of claim 1, wherein, The signal generating device (16) is a permanent magnet, and the sensor is a magnetic sensor matched with the permanent magnet.

6. The plunger pump shoe wear monitoring mechanism of claim 5, wherein, The number of the permanent magnets is multiple, and the multiple permanent magnets are uniformly distributed in the circumferential direction on one side of the return plate (10) close to the plunger, so that the magnetic field signals are uniformly generated.

7. The plunger pump shoe wear monitoring mechanism of claim 6, wherein, There is one permanent magnet between any two sliding shoe holes on the return plate, and each permanent magnet is fixedly installed on the return plate by a fastening screw.

8. The plunger pump shoe wear monitoring mechanism of claim 1, wherein, The wear amount monitoring result output device comprises a wireless communication module, and the processor transmits the collected magnetic field signals or the sliding shoe wear amount and / or the sliding shoe wear alarm signal determined according to the magnetic field signals to the outside through the wireless communication module.

9. The plunger pump shoe wear monitoring mechanism of claim 8, wherein, The wear amount monitoring result output device further comprises a wear alarm, and the control end of the wear alarm is connected to the processor, for receiving the sliding shoe wear alarm instruction and outputting the sliding shoe wear alarm signal.

10. A piston pump characterized in that The plunger pump is provided with the plunger pump sliding shoe wear amount monitoring mechanism of any one of claims 1 to 9.

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