Hydrostatic spindle testing device

Abstract

The application discloses a liquid static pressure spindle testing device, which comprises a supporting platform, a liquid static pressure spindle, a hydraulic monitoring mechanism and a spindle performance detection mechanism. The liquid static pressure spindle comprises a driving part, a spindle part and a throttler. The spindle part comprises a shell, a shaft core and a liquid static pressure bearing assembly. The shaft core is arranged in the shell through the liquid static pressure bearing assembly. A static pressure oil cavity is arranged between the shaft core and the liquid static pressure bearing assembly. The throttler is arranged on the liquid static pressure bearing assembly. The hydraulic monitoring mechanism is used for monitoring the hydraulic oil entering and exiting the throttler to obtain the working characteristic parameters of the throttler. The spindle performance detection mechanism is arranged on the supporting platform. The spindle performance detection mechanism is used for detecting the dynamic and static characteristic parameters of the liquid static pressure spindle during the working process of the throttler. The application solves the problem that there is no testing platform for the liquid static pressure spindle and the throttler to test the dynamic and static characteristics of the liquid static pressure spindle under different working conditions of the throttler.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tools, in particular to a liquid static pressure spindle testing device. BACKGROUND

[0002] The liquid static pressure spindle is a device for realizing high-speed rotation based on the principle of liquid static pressure balance. Its main advantages are high rigidity, stable high-speed rotation, automatic compensation and no friction. Generally, the liquid static pressure spindle is composed of a gas static pressure bearing and a transmission device. The liquid static pressure bearing is the most critical part of the liquid static pressure spindle. It uses high-pressure liquid to form an oil film between the spindle and the bearing to reduce friction and vibration, thereby realizing the stability and precision of the liquid static pressure spindle during high-speed rotation. In order to ensure the stability of the oil film stiffness between the liquid static pressure bearing and the liquid static pressure spindle, a flow compensation device, i.e. a throttle, is generally used to improve the oil film stiffness and damping coefficient.

[0003] Compared with traditional spindles using sliding bearings or rolling bearings, the parameters of the throttle have a significant impact on the performance of the liquid static pressure spindle. However, the existing detection platforms have relatively simple functions and can only detect single working parameters such as rotation accuracy, dynamic stiffness, static stiffness and vibration of the spindle. There is no testing platform for the liquid static pressure spindle and its throttle to test the dynamic and static characteristics of the liquid static pressure spindle under different working conditions of the throttle. Therefore, it is difficult to determine the influence of the working characteristics of the throttle on the dynamic and static characteristics of the liquid static pressure spindle. The parameters reflecting the working characteristics of the throttle include the inlet and outlet oil temperature, flow and pressure, while the parameters reflecting the dynamic and static characteristics of the liquid static pressure spindle include rotation accuracy, dynamic stiffness, static stiffness and vibration. SUMMARY

[0004] The main purpose of the present application is to provide a liquid static pressure spindle testing device to solve the problem that there is no testing platform for the liquid static pressure spindle and its throttle to test the dynamic and static characteristics of the liquid static pressure spindle under different working conditions of the throttle.

[0005] According to one aspect of the present application, a liquid static pressure spindle testing device is provided, comprising:

[0006] a support platform;

[0007] A hydrostatic spindle is arranged on the support platform, and the hydrostatic spindle comprises a driving part, a spindle part and a throttling device. The driving part is connected with the spindle part, and the driving part is used to drive the spindle part to rotate. The spindle part comprises a shell, a shaft core and a hydrostatic bearing assembly. The shaft core is arranged in the shell through the hydrostatic bearing assembly, and a hydrostatic oil cavity is arranged between the shaft core and the hydrostatic bearing assembly. The throttling device is arranged on the hydrostatic bearing assembly, and the throttling device is used to return the hydraulic oil to the hydrostatic oil cavity after throttling treatment.

[0008] A hydraulic monitoring mechanism is arranged on the support platform, and the hydraulic monitoring mechanism is used to monitor the hydraulic oil entering and / or exiting the throttling device to obtain the working characteristic parameters of the throttling device.

[0009] A spindle performance detection mechanism is arranged on the support platform, and the spindle performance detection mechanism is used to detect the dynamic and static characteristic parameters of the hydrostatic spindle during the working process of the throttling device.

[0010] Further, the hydraulic monitoring mechanism comprises:

[0011] A throttling adapter is arranged between the hydrostatic bearing assembly and the throttling device, and the throttling adapter is provided with a channel. The hydraulic oil in the hydrostatic oil cavity enters and / or exits the throttling device through the channel.

[0012] A monitoring module is connected with the throttling adapter, and the monitoring module is used to monitor the physical characteristics of the hydraulic oil flowing through the channel.

[0013] Further, the throttling device is provided with an oil inlet, and the channel comprises:

[0014] A first channel is arranged, one end of the first channel is communicated with the hydrostatic oil cavity, and the other end of the first channel is communicated with the oil inlet. The monitoring module is used to monitor the physical characteristics of the hydraulic oil in the first channel.

[0015] Further, the first channel is provided with a shunt channel, and the monitoring module comprises:

[0016] A first connecting pipeline is arranged, and the first connecting pipeline is communicated with the shunt channel.

[0017] A first pressure sensor is arranged on the first connecting pipeline, and the first pressure sensor is used to monitor the oil pressure of the hydraulic oil in the first channel.

[0018] Further, the throttling device is further provided with an oil outlet, and the channel further comprises:

[0019] a second channel, one end of the second channel being in communication with the oil outlet, the monitoring module being configured to monitor the physical property of the hydraulic oil flowing from the restrictor into the second channel;

[0020] a third channel, one end of the third channel being in communication with the second channel and the other end being in communication with the static pressure oil cavity.

[0021] Further, the second channel and the third channel are in communication through a second connecting pipeline, and the monitoring module further comprises:

[0022] a second pressure sensor, the second pressure sensor being arranged on the second connecting pipeline, the second pressure sensor being configured to monitor the oil pressure of the hydraulic oil flowing from the restrictor into the second channel;

[0023] and / or a temperature sensor, the temperature sensor being arranged on the second connecting pipeline, the temperature sensor being configured to monitor the temperature of the hydraulic oil flowing from the restrictor into the second channel;

[0024] and / or a flow sensor, the flow sensor being arranged on the second connecting pipeline, the flow sensor being configured to monitor the flow of the hydraulic oil flowing from the restrictor into the second channel.

[0025] Further, the monitoring module further comprises:

[0026] a third pressure sensor, the third pressure sensor being arranged on the second connecting pipeline, the third pressure sensor being configured to monitor the oil pressure of the hydraulic oil flowing through the flow sensor.

[0027] Further, the spindle performance detection mechanism comprises:

[0028] a static stiffness detection assembly, the static stiffness detection assembly being connected to one end of the spindle portion away from the driving portion, the static stiffness detection assembly being configured to detect the static stiffness of the liquid static pressure spindle;

[0029] and / or a dynamic stiffness detection assembly, the dynamic stiffness detection assembly being configured to detect the dynamic stiffness and / or vibration frequency of the liquid static pressure spindle;

[0030] and / or a rotation accuracy detection assembly, the rotation accuracy detection assembly being connected to one end of the spindle portion away from the driving portion, the rotation accuracy detection assembly being configured to monitor the rotation accuracy parameter of the liquid static pressure spindle;

[0031] and / or a torque sensor, the torque sensor being connected between the driving portion and the shaft core through a shaft coupling, the torque sensor being configured to monitor the torque of the shaft core at different rotation speeds.

[0032] Further, the static stiffness detection assembly comprises:

[0033] The loading unit comprises a support frame, a load transmission part and a load adjusting part, the load transmission part is fixed to the support platform through the support frame and rotatably connected with the shaft core, the support frame and the load transmission part have a predetermined installation space, the load adjusting part is installed in the predetermined installation space and connected with the load transmission part, and the load adjusting part is used for applying a pressure load or a tension load to the load transmission part.

[0034] The displacement detection unit comprises an axial displacement sensor and a radial displacement sensor, the axial displacement sensor and the radial displacement sensor are arranged on the main shaft part, the axial displacement sensor is used for detecting the axial displacement of the shaft core, and the radial displacement sensor is used for detecting the radial displacement of the shaft core.

[0035] Further, the load adjusting part comprises:

[0036] A fourth pressure sensor;

[0037] The first support rod is provided with a fastener, and the fastener is rotatably connected with the support frame away from one end of the first support rod.

[0038] The second support rod is connected between the first support rod and the second support rod through a connecting rod, the first support rod can reciprocate along the axial direction of the connecting rod relative to the connecting rod, and the second support rod is fixedly connected with the load transmission part.

[0039] The liquid static pressure spindle testing device provided by the application can monitor the hydraulic oil entering and exiting the flow restrictor through the hydraulic monitoring mechanism to obtain the working characteristic parameters of the flow restrictor while detecting the dynamic and static characteristic parameters of the liquid static pressure spindle by the spindle performance detection mechanism on the support platform during the throttling process of the liquid static pressure spindle through the flow restrictor, so as to test the dynamic and static characteristics of the liquid static pressure spindle under different working conditions of the flow restrictor. Subsequently, the change information of the dynamic and static characteristics of the liquid static pressure spindle with the working characteristics of the flow restrictor can be determined according to the obtained working characteristic parameters and dynamic and static characteristic parameters, so as to accurately improve the dynamic and static characteristics of the liquid static pressure spindle by adjusting the working characteristics of the flow restrictor according to the change information. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0041] Figure 1 A structural schematic diagram of a hydrostatic spindle testing device according to an embodiment of the application;

[0042] Figure 2 A structural schematic diagram of a hydrostatic spindle testing device according to an embodiment of the application; Figure 1 A structural schematic diagram of a hydrostatic spindle testing device according to an embodiment of the application;

[0043] Figure 3 A structural schematic diagram of a hydrostatic spindle testing device according to an embodiment of the application;

[0044] Figure 4 A structural schematic diagram of a hydrostatic spindle testing device according to an embodiment of the application;

[0045] Figure 5 A structural schematic diagram of a hydrostatic spindle testing device according to an embodiment of the application;

[0046] Figure 6 A structural schematic diagram of a hydrostatic spindle testing device according to an embodiment of the application.

[0047] In the above drawings, the following reference signs are used:

[0048] 10, support platform; 20, spindle motor; 21, shaft coupling; 31, housing; 32, shaft core; 33, fixed bearing; 34, floating bearing; 35, axial displacement sensor; 36, radial displacement sensor; 40, restrictor; 50, restrictor adapter; 51, first channel; 511, shunt channel; 52, second channel; 53, third channel; 60, first connecting pipeline; 61, first pressure sensor; 62, second connecting pipeline; 63, second pressure sensor; 64, temperature sensor; 65, flow sensor; 66, third pressure sensor; 70, support frame; 80, load transmission part; 81, mounting shell; 82, end cover; 83, sleeve; 84, locking nut; 86, bearing; 90, load adjustment part; 91, fourth pressure sensor; 92, first support rod; 93, fastener; 94, second support rod; 95, connecting rod. DETAILED DESCRIPTION

[0049] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0050] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0051] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless otherwise specifically stated. It is to be understood that the drawings shown in the figures are not drawn to scale for ease of illustration of the various components. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, techniques, methods, and apparatus should be considered as being within the scope of the claims. In all examples shown and discussed herein, any specific values are to be interpreted as being merely exemplary and not limiting. Other examples of the example embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings and, as such, no further discussion with regard thereto is deemed necessary.

[0052] To ensure the stability of the oil film stiffness between the hydrostatic bearing 86 and the hydrostatic spindle, the throttle 40 is generally used to adjust the stability of the oil film stiffness, and the working condition of the throttle 40 will affect the performance of the hydrostatic spindle. In order to obtain a hydrostatic spindle with better working performance by exploring the influence of the working characteristics of the throttle 40 on the dynamic and static characteristics of the hydrostatic spindle, a test platform for the hydrostatic spindle and the throttle 40 is needed to test the dynamic and static characteristics of the hydrostatic spindle under different working conditions of the throttle 40. In this regard, the first embodiment of the present application provides a hydrostatic spindle test device, which comprises a support platform 10, a hydrostatic spindle, a hydraulic monitoring mechanism and a spindle performance detection mechanism.

[0053] As Figure 1 and Figure 2As shown, the liquid static pressure spindle is arranged on the support platform 10, and the liquid static pressure spindle comprises a driving part, a spindle part, and a throttler 40, the driving part is connected with the spindle part, and the driving part is used for driving the spindle part to rotate. The spindle part comprises a shell 31, a shaft core 32, and a liquid static pressure bearing 86 assembly, the shaft core 32 is arranged in the shell 31 through the liquid static pressure bearing 86 assembly, and a static pressure oil cavity is arranged between the shaft core 32 and the liquid static pressure bearing 86 assembly, the throttler 40 is arranged on the liquid static pressure bearing 86 assembly, and the throttler 40 is used for returning the hydraulic oil to the static pressure oil cavity after throttling, so as to adjust the stability of the oil film stiffness between the liquid static pressure bearing 86 assembly and the shaft core 32. The hydraulic monitoring mechanism is used for monitoring the hydraulic oil entering and exiting the throttler 40 to obtain the working characteristic parameters of the throttler 40, and the working characteristic parameters can include at least one of the hydraulic oil pressure, temperature, and flow of the hydraulic oil entering and exiting the throttler 40. The spindle performance detection mechanism is arranged on the support platform 10, and the spindle performance detection mechanism is used for detecting the dynamic and static characteristic parameters of the liquid static pressure spindle during the working process of the throttler 40. During the adjustment of the oil film stiffness of the liquid static pressure spindle through the throttler 40, the working characteristic parameters of the throttler 40 are tested, and the dynamic and static characteristic parameters of the liquid static pressure spindle are detected through the spindle performance detection mechanism at any time, so as to determine the influence of the working characteristic of the throttler 40 on the dynamic and static characteristics of the liquid static pressure spindle according to the obtained parameters, and to adjust the working parameters of the throttler 40 and the liquid static pressure spindle according to the influence, so as to obtain the liquid static pressure spindle with better working performance.

[0054] It can be seen that the liquid static pressure spindle testing device provided by the embodiment of the present application can monitor the hydraulic oil entering and exiting the throttler 40 through the hydraulic monitoring mechanism to obtain the working characteristic parameters of the throttler 40, and detect the dynamic and static characteristic parameters of the liquid static pressure spindle through the spindle performance detection mechanism on the support platform 10 during the throttling process of the liquid static pressure spindle through the throttler 40, so as to achieve the purpose of testing the dynamic and static characteristics of the liquid static pressure spindle under different working conditions of the throttler 40. Subsequently, the change information of the dynamic and static characteristics of the liquid static pressure spindle with the working characteristic of the throttler 40 can be determined according to the obtained working characteristic parameters and dynamic and static characteristic parameters, so as to accurately improve the dynamic and static characteristics of the liquid static pressure spindle by adjusting the working characteristic of the throttler 40 according to the change information, and obtain the liquid static pressure spindle with better working performance.

[0055] The hydraulic monitoring mechanism in the embodiment comprises a throttling adapter 50 and a monitoring module. The throttling adapter 50 is arranged between the liquid static pressure bearing 86 assembly and the throttling device 40. The throttling adapter 50 is provided with a channel, and the hydraulic oil in the static pressure oil cavity enters and / or flows out of the throttling device 40 through the channel. The monitoring module is connected with the throttling adapter 50, and the monitoring module is used for monitoring the physical properties of the hydraulic oil flowing through the channel, such as oil pressure, flow, temperature and other properties. These physical properties can directly reflect the working properties of the throttling device 40, so as to realize the test of the working properties of the throttling device 40. In the embodiment, the throttling adapter 50 is connected between the throttling device 40 and the static pressure oil cavity of the liquid static pressure spindle as a shunt structure, so that the monitoring module for monitoring the physical properties of the hydraulic oil can be connected near the inlet and outlet of the throttling device 40, thereby reducing the monitoring error caused by the loss of pressure in the long distance or the elements in the monitoring module. The arrangement of the throttling adapter 50 will not affect the operation of the liquid static pressure spindle. Not only the static pressure properties of the oil film in the liquid static pressure spindle can be monitored, but also the dynamic pressure properties of the oil film (i.e. the oil film properties under the working conditions of rotation and loading of the liquid static pressure spindle) can be monitored. Therefore, the working properties of the throttling device 40 are adjusted by the tested working property parameters of the throttling device 40 under different working conditions and the dynamic and static property parameters of the liquid static pressure spindle under the corresponding working conditions, and the dynamic and static properties of the liquid static pressure spindle are accurately improved.

[0056] The liquid static pressure bearing 86 assembly comprises a fixed bearing 33 and a floating bearing 34. The fixed bearing 33 is arranged at one end of the spindle portion away from the driving portion, and the floating bearing 34 is arranged at one end of the spindle portion close to the driving portion. Since there are a plurality of static pressure oil cavities between the fixed bearing 33 and the shaft core 32 and between the floating bearing 34 and the shaft core 32, the throttling device 40 in the embodiment has a plurality of throttling devices 40, and the plurality of throttling devices 40 are arranged one by one corresponding to the plurality of static pressure oil cavities. For this purpose, in order to accurately measure the working property parameters of the plurality of throttling devices 40, the throttling adapter 50 also comprises a plurality of throttling adapters 50, and the plurality of throttling adapters 50 are arranged one by one between the throttling device 40 and the liquid static pressure bearing 86 assembly. Figure 1 and Figure 2As shown, ten throttles 40 are arranged on the outer circumferential surface of the fixed bearing 33, and ten throttle adapters 50 are arranged correspondingly on the side of the fixed bearing 33 near the fixed bearing 33. Four throttles 40 are arranged at intervals on the outer circumferential surface of the floating bearing 34, and four throttle adapters 50 are arranged correspondingly on the side of the four throttles 40 opposite to the floating bearing 34. Thus, the throttle adapters 50 act as a flow-diverting structure connecting the throttles 40 and the hydrostatic oil chamber of the hydrostatic spindle, and the physical characteristics of the hydraulic oil entering and exiting each throttle 40 are accurately monitored by a monitoring module. Among them, the outer peripheral surfaces of the fixed bearing 33 and the floating bearing 34 connected to the throttling adapter 50 are respectively provided with oil inlet and outlet ports that communicate with the channels in the corresponding throttling adapter 50. Thus, the hydraulic oil can enter the throttle 40 from the hydrostatic oil chamber through the oil inlet and outlet ports on the fixed bearing 33 and the floating bearing 34. After the hydraulic oil is throttled by the throttling adapter 40, it returns to the hydrostatic oil chamber along the channels in the throttling adapter 50 and the oil inlet and outlet ports on each bearing 86, thereby realizing the adjustment of the oil film stiffness in the hydrostatic spindle.

[0057] The throttle 40 is equipped with an oil inlet, such as Figure 3 and Figure 4 As shown, the channel in the throttling adapter 50 includes a first channel 51. One end of the first channel 51 is connected to the static pressure oil chamber, and the other end is connected to the oil inlet. The monitoring module is used to monitor the physical characteristics of the hydraulic oil in the first channel 51. Since the first channel 51 is located near the oil inlet of the throttling device 40 and is directly connected to the oil inlet, the physical characteristics of the hydraulic oil in the first channel 51 are the same as the physical characteristics of the hydraulic oil entering the throttling device 40. By monitoring the physical characteristics of the hydraulic oil in the first channel 51 through the monitoring module, the physical characteristics of the hydraulic oil before entering the throttling device 40 can be accurately monitored.

[0058] like Figure 4 As shown, a diversion channel 511 is provided on the first channel 51. The monitoring module includes a first connecting pipe 60 and a first pressure sensor 61. The first connecting pipe 60 is connected to the diversion channel 511. The first pressure sensor 61 is installed on the first connecting pipe 60 and is used to monitor the oil pressure of the hydraulic oil in the first channel 51. Before entering the throttle valve 40, the hydraulic oil is divided into two paths. One path enters the inlet of the throttle valve 40 from the first channel 51, and the other path enters the first connecting pipe 60 along the diversion channel 511. The oil pressure of the hydraulic oil before entering the throttle valve 40 is measured by the first pressure sensor 61 on the first connecting pipe 60.

[0059] The throttle adapter 50 further comprises a second channel 52 and a third channel 53. The second channel 52 is in communication with the oil outlet at one end and the second channel 52 at the other end. The monitoring module is used to monitor the physical properties of the hydraulic oil flowing from the throttle 40 into the second channel 52. The physical properties of the hydraulic oil after being throttled by the throttle 40 are monitored. Subsequently, the influence of the physical properties on the dynamic and static characteristics of the hydrostatic bearing 86 can be determined based on the monitoring results. The throttle 40 and the hydrostatic bearing 86 can be adjusted according to the influence until the hydrostatic bearing 86 with better dynamic and static characteristics is obtained. The third channel 53 is in communication with the second channel 52 at one end and the static pressure oil cavity at the other end. After the monitoring module tests the physical properties of the throttled hydraulic oil, the hydraulic oil is transported back to the static pressure oil cavity from the third channel 53 to adjust the oil film stiffness between the hydrostatic spindle and the bearing 86 assembly. The dynamic and static characteristics of the hydrostatic spindle are detected by the spindle performance detection mechanism after the oil film stiffness between the hydrostatic spindle and the bearing 86 assembly is adjusted. Through repeated adjustments, the change information of the dynamic and static characteristics of the hydrostatic spindle with the working characteristics of the throttle 40 is ultimately determined. The working characteristics of the throttle 40 are adjusted according to the change information to accurately improve the dynamic and static characteristics of the hydrostatic spindle, and a hydrostatic spindle with better working performance is obtained.

[0060] As shown in Figure 3 The second channel 52 and the third channel 53 of the throttle adapter 50 are in communication through a second connecting pipeline 62. The monitoring module further comprises a second pressure sensor 63, a temperature sensor 64, and a flow sensor 65. The second pressure sensor 63, the temperature sensor 64, and the flow sensor 65 are all arranged on the second connecting pipeline 62. The second pressure sensor 63 is used to monitor the oil pressure of the hydraulic oil flowing from the throttle 40 into the second channel 52. The temperature sensor 64 is used to monitor the temperature of the hydraulic oil flowing from the throttle 40 into the second channel 52. The flow sensor 65 is used to monitor the flow of the hydraulic oil flowing from the throttle 40 into the second channel 52. It can be seen that the present embodiment can monitor the oil pressure, temperature, flow, and other working characteristic parameters of the hydraulic oil near the oil outlet of the throttle 40 without affecting the performance of the hydrostatic spindle through the throttle adapter 50. The pressure loss caused by the long oil line or other hydraulic elements in the oil line can be avoided, and the measurement result is more accurate. The monitoring module of the present embodiment can further comprise a viscosity sensor for monitoring the liquid viscosity of the hydraulic oil entering and exiting the throttle 40.

[0061] If the pressure drop of the flow sensor 65 is too large, the pressure of the hydraulic oil entering the static pressure oil chamber will not be consistent with the pressure at the outlet of the restrictor 40. To avoid measurement errors caused by the pressure loss of the flow sensor 65, the hydraulic monitoring mechanism further includes a third pressure sensor 66. The third pressure sensor 66 is arranged on the second connecting pipeline 62, and is used to monitor the oil pressure of the hydraulic oil flowing through the flow sensor 65. Thus, in the embodiment, the second pressure sensor 63 is arranged at the inlet end of the flow sensor 65, and the third pressure sensor 66 is arranged at the outlet end of the flow sensor 65, so as to determine whether the oil pressure of the hydraulic oil before and after flowing through the flow sensor 65 is consistent. If not, the flow sensor 65 with smaller pressure loss can be replaced to avoid the inconsistency between the pressure of the hydraulic oil entering the static pressure oil chamber and the pressure at the outlet of the restrictor 40 caused by the pressure loss of the flow sensor 65, so as to finally ensure that the dynamic and static characteristic parameters of the liquid static pressure spindle obtained by measurement are under the working characteristic parameters of the corresponding restrictor 40, thereby accurately obtaining the liquid static pressure spindle with better dynamic and static characteristic parameters based on the working characteristic parameters.

[0062] The spindle performance detection mechanism in the embodiment includes a static stiffness detection assembly, a dynamic stiffness detection assembly, a rotation accuracy detection assembly, and a torque sensor. The static stiffness detection assembly is connected to the end of the spindle part away from the driving part, and is used to detect the static stiffness of the liquid static pressure spindle. The dynamic stiffness detection assembly is used to detect the dynamic stiffness and / or vibration frequency of the liquid static pressure spindle. The rotation accuracy detection assembly is connected to the end of the spindle part away from the driving part, and is used to monitor the rotation accuracy parameters of the liquid static pressure spindle. The torque sensor is connected between the driving part and the shaft core 32 through the coupling 21, and is used to monitor the torque of the shaft core 32 at different rotation speeds.

[0063] The static stiffness detection assembly comprises a loading unit and a displacement detection unit. The loading unit comprises a support frame 70, a load transmission part 80 and a load adjusting part 90. The load transmission part 80 is fixed to the support platform 10 through the support frame 70 and rotatably connected with the shaft core 32, and the support frame 70 and the load transmission part 80 have a predetermined installation space therebetween. The load adjusting part 90 is installed in the predetermined installation space and connected with the load transmission part 80, and the load adjusting part 90 is used to apply a pressure load or a tensile load to the load transmission part 80. After the load transmission part 80 is subjected to the pressure load or the tensile load applied by the load adjusting part 90, the load adjusting part 90 can rotate relative to the shaft core 32, so that the pressure load or the tensile load can be transmitted to the shaft core 32 without affecting the rotation of the shaft core 32, and in turn the load working condition of the liquid static pressure spindle is simulated. Therefore, in the process of throttling the liquid static pressure spindle under different load working conditions through the throttler 40, the working characteristic parameters of the throttler 40 are monitored and obtained through the hydraulic monitoring mechanism, and the dynamic and static characteristic parameters of the liquid static pressure spindle are detected and obtained through the spindle performance detection mechanism during the working process of the throttler 40.

[0064] The displacement detection unit comprises an axial displacement sensor 35 and a radial displacement sensor 36, and the axial displacement sensor 35 and the radial displacement sensor 36 are arranged on the spindle part. The axial displacement sensor 35 is used to detect the axial displacement of the shaft core 32, and the radial displacement sensor 36 is used to detect the radial displacement of the shaft core 32. Specifically, the side of the shaft core 32 away from the load transmission part 80 is the end face of the fixed bearing 33, and the axial displacement sensor 35 and the radial displacement sensor 36 can be installed on the end face of the fixed bearing 33 to detect the axial displacement and the radial displacement of the shaft core 32, respectively.

[0065] Specifically, the support frame 70 and the load transmission part 80 have two predetermined installation spaces, one of which is located at one end of the axial core 32 in the axial direction, and the other of which is located at one side of the axial core 32 in the radial direction. The two load adjusting parts 90 are installed in the two predetermined installation spaces one by one and are connected with the load transmission part 80 respectively. One of the load adjusting parts 90 is used to apply a load to the axial core 32 in the radial direction through the load transmission part 80, and the other of the load adjusting parts 90 is used to apply a load to the axial core 32 in the axial direction through the load transmission part 80. After the two load adjusting parts 90 apply loads, the radial displacement and the axial displacement of the axial core 32 are detected by the axial displacement sensor 35 and the radial displacement sensor 36 respectively, so as to obtain the static stiffness of the hydrostatic spindle according to the radial displacement, the axial displacement and the applied load. The radial static stiffness of the axial core 32 is the ratio of the load applied to the axial core 32 by the load adjusting part 90 in the radial direction to the radial displacement, and the axial static stiffness of the axial core 32 is the ratio of the load applied to the axial core 32 by the load adjusting part 90 in the axial direction to the axial displacement. The axial displacement and the radial displacement of the hydrostatic spindle will cause the change of the oil film thickness, so as to cause the change of the oil pressure and the flow of the hydraulic oil at the outlet of the restrictor 40, and the change of the oil pressure and the flow of the hydraulic oil at the outlet of the restrictor 40 determines the size of the oil film stiffness, thereby inversely affecting the static stiffness of the hydrostatic spindle. Therefore, the static stiffness of the hydrostatic spindle changes with the change of the load applied to the axial core 32, and the load-static stiffness curve, the load-flow curve, the load-oil pressure curve, the flow-static stiffness curve and other characteristic curves related to the static stiffness and the working characteristic parameters of the restrictor 40 can be output by processing the data of the monitored flow, oil pressure, temperature and viscosity of the hydraulic oil at the inlet and outlet of the restrictor 40, and the load, displacement and other parameters of the axial core 32. The working characteristic parameters of the static stiffness in a better numerical range are determined according to the corresponding characteristic curves, and then the working characteristics of the restrictor 40 are adjusted according to the corresponding working characteristic parameters, so as to obtain the hydrostatic spindle with better static stiffness performance.

[0066] As Figure 5As shown, the load adjusting part 90 comprises a fourth pressure sensor 91, a first supporting rod 92, and a second supporting rod 94, the first supporting rod 92 is provided with a fastener 93, and the fastener 93 is rotatably connected with the supporting frame 70 at the end away from the first supporting rod 92. The fastener 93 is a locking bolt, a screw or the like. The fourth pressure sensor 91 is connected between the first supporting rod 92 and the second supporting rod 94 through a connecting rod 95, the fourth pressure sensor 91 is used for monitoring the pressure load or the tensile load, and the first supporting rod 92 can reciprocate along the axial direction of the connecting rod 95 relative to the connecting rod 95, and the second supporting rod 94 is fixedly connected with the load transmission part 80. The fourth pressure sensor 91 can comprise an S-type pressure sensor, the first supporting rod 92 can be moved towards or away from the load transmission part 80 by adjusting the fastener 93, the tensile load or the pressure load applied by the S-type pressure sensor can act on the load transmission part 80, so as to adjust the tensile load or the pressure load applied on the load transmission part 80, to simulate different loads applied on the shaft core 32.

[0067] As shown in the drawings, Figure 6 The load transmission part 80 in the embodiment comprises a mounting shell 81, an end cover 82, a sleeve 83, a locking nut 84, and a bearing 86. The sleeve 83 is sleeved and locked on the shaft core 32 through the locking nut 84, and the sleeve 83 rotates coaxially with the shaft core 32. The mounting shell 81 is connected with the outer surface of the sleeve 83 through the bearing 86, and the bearing 86 is fixed in the mounting shell 81 through the end cover 82, and the outer surface of the mounting shell 81 is connected with the second supporting rod 94 of the load adjusting part 90. The mounting shell 81 is connected between the first supporting rod 92 and the second supporting rod 94 through two S-type pressure sensors in the axial direction and the radial direction, respectively. The tensile force or the pressure applied by the first supporting rod 92 on the two S-type pressure sensors is transmitted to the mounting shell 81 of the outer ring of the bearing 86 and then to the shaft core 32, and the load transmission part 80 does not affect the rotation of the shaft core 32, thereby simulating the load working conditions borne by the shaft core 32.

[0068] The second embodiment of the present application is based on the above-mentioned embodiment, and in combination with the drawings, Figures 1 to 6 An application embodiment of a hydrostatic spindle testing device is provided.

[0069] The hydrostatic spindle testing device in the application embodiment comprises a supporting platform 10, a spindle system (i.e. a hydrostatic spindle), a hydraulic system, a hydraulic monitoring mechanism, a spindle performance detection mechanism, and a data analysis system.

[0070] As shown in the drawings, Figure 1As shown, the liquid static pressure spindle comprises a driving part, a spindle part and a throttle 40. The driving part comprises a spindle motor 20 and a coupling 21, and the spindle part comprises a shaft core 32, a shell 31, a fixed bearing 33, a floating bearing 34 and the throttle 40. The throttle 40 is a diaphragm throttle 40, four throtles 40 are arranged on the floating bearing 34, and a throttle adapter 50 is arranged between the floating bearing 34 and each throttle 40 in one-to-one correspondence. The fixed bearing 33 is provided with ten throtles 40, and a throttle adapter 50 is arranged between the fixed bearing 33 and each throttle 40 in one-to-one correspondence. The hydraulic system comprises a hydraulic station, a hydraulic oil heater and the like, and is used to provide the hydraulic oil required in the rotation process of the liquid static pressure spindle.

[0071] The hydraulic monitoring mechanism comprises the throttle adapter 50, a temperature sensor 64, a pressure sensor, a flow sensor 65 and a viscosity sensor. The throttle adapter 50 is installed between the throttle 40 and the bearing 86 (such as the fixed bearing 33 and the floating bearing 34), and the hydraulic oil is pressurized by the hydraulic station, then enters the oil port of the fixed bearing 33 and the floating bearing 34 through the connecting pipeline between the hydraulic station and the liquid static pressure spindle, is divided into the first channel 51 of each throttle adapter 50 through the hydraulic oil transmission channel in the fixed bearing 33 and the floating bearing 34, and the first channel 51 is provided with a shunt channel 511. The shunt channel 511 is connected with the first pressure sensor 61 used to monitor the oil pressure before throttling, and flows into the oil inlet of the throttle 40 through the first channel 51 of the throttle adapter 50. After the throttle 40 throttles the entering hydraulic oil, the second channel 52 of the throttle adapter 50 is connected with the first oil passage block provided on the second connecting pipeline 62, the first oil passage block is provided with two shunt ports, and the two shunt ports are connected with the second pressure sensor 63 and the temperature sensor 64 respectively, which are used to monitor the oil pressure and the oil temperature after throttling. The throttled hydraulic oil enters the static pressure oil cavity of the floating bearing 34 and the fixed bearing 33 from the third channel 53 of the throttle adapter 50 in sequence through the second pressure sensor 63, the temperature sensor 64, the flow sensor 65 and the third pressure sensor 66 on the second oil passage block, and flows out back to the hydraulic station through the oil sealing edge arranged in the floating bearing 34 and the fixed bearing 33. In fact, the hydraulic station also has sensors for monitoring the oil temperature, the oil pressure and the viscosity. In order to detect the oil parameters at the inlet and outlet of the throttle 40, the throttle adapter 50 is designed, so that the first pressure sensor 61 can be connected to the proximal end of the oil inlet of the throttle 40, the pressure loss caused by the long pipeline can be avoided, and the monitoring result of the first pressure sensor 61 is more accurate. The second pressure sensor 63 monitors the oil pressure at the outlet of the throttle 40, and the third pressure sensor 66 monitors the oil pressure of the hydraulic oil entering the static pressure oil cavity after pressure drop by the flow sensor 65.

[0072] The monitoring elements such as the first pressure sensor 61, the second pressure sensor 63, the third pressure sensor 66, the flow sensor 65, the temperature sensor 64, and the viscosity sensor are connected to the inlet or outlet of the flow restrictor 40, so as to reduce the monitoring error caused by the pressure loss of the elements in the long distance or the oil circuit. The setting of the flow restrictor adapter 50 does not affect the operation of the hydrostatic spindle.

[0073] The spindle performance detection mechanism comprises a static stiffness detection assembly, a dynamic stiffness detection assembly, a rotation accuracy detection assembly, and a torque detection device. The static stiffness detection assembly, the dynamic stiffness detection assembly, the rotation accuracy detection assembly, and the torque detection device can detect the load, displacement, acceleration, torque, and other parameters of the hydrostatic spindle in real time. Through data analysis and processing by the data acquisition and processing system, the dynamic stiffness, static stiffness, rotation accuracy, and torque performance parameters of the spindle can be output.

[0074] The static stiffness detection assembly comprises a loading unit and a displacement detection unit. The loading unit comprises a support frame 70, a mounting shell 81, an end cover 82, a sleeve 83, a locking nut 84, a bearing 86, two S-shaped pressure sensors, and a load adjusting part 90. The sleeve 83 is sleeved and locked on the shaft core 32 through the locking nut 84, and the sleeve 83 rotates coaxially with the shaft core 32. The mounting shell 81 is connected with the outer surface of the sleeve 83 through the bearing 86, and the bearing 86 is fixed in the mounting shell 81 through the end cover 82. The outer surface of the mounting shell 81 is connected with the second support rod 94 of the load adjusting part 90. The mounting shell 81 is connected with the first support rod 92 and the second support rod 94 through the two S-shaped pressure sensors in the axial and radial directions, respectively. The tension or pressure applied by the first support rod 92 on the two S-shaped pressure sensors is transmitted to the mounting shell 81 of the outer ring of the bearing 86 and then to the shaft core 32, and the load transmission part 80 does not affect the rotation of the shaft core 32, thereby simulating the load working condition of the shaft core 32.

[0075] The displacement detection unit comprises an axial displacement sensor 35 and a radial displacement sensor 36, which are connected to the end side of the load adjusting part 90 or the fixed bearing 33 through a sensor support. The axial displacement sensor 35 and the radial displacement sensor 36 can be capacitive sensors, which are used to detect the axial displacement and radial displacement of the shaft core 32 under different loads, respectively.

[0076] The axial displacement sensor 35 and the radial displacement sensor 36 detect the deformation displacement of the shaft core 32 after the load is applied by the two S-shaped pressure sensors, and the static stiffness of the hydrostatic spindle is obtained. The axial displacement and the radial displacement of the hydrostatic spindle cause the change of the oil film thickness, thereby causing the change of the oil pressure and the flow of the hydraulic oil at the outlet of the restrictor 40, and the change of the oil pressure and the flow of the hydraulic oil at the outlet of the restrictor 40 determines the size of the oil film stiffness, thereby inversely affecting the static stiffness of the hydrostatic spindle. Therefore, the static stiffness of the hydrostatic spindle changes with the change of the load applied to the shaft core 32, and the load-static stiffness curve, the load-flow curve, the load-oil pressure curve, the flow-static stiffness curve and other characteristic curves related to the static stiffness and the working characteristic parameters of the restrictor 40 can be obtained by processing the data of the monitored flow, oil pressure, temperature and viscosity of the hydraulic oil at the inlet and outlet of the restrictor 40, and the load, displacement and other parameters on the shaft core 32. According to the corresponding characteristic curves, the working characteristic parameters of the static stiffness in the better numerical range are determined, and then the working characteristics of the restrictor 40 are adjusted according to the corresponding working characteristic parameters, and the hydrostatic spindle with better static stiffness performance is obtained.

[0077] The dynamic stiffness detection assembly includes a force hammer, an acceleration sensor and a data acquisition instrument. The acceleration sensor is adsorbed or pasted on the hydrostatic spindle, the hydrostatic spindle is struck by the force hammer, and then the vibration frequency and amplitude change of the hydrostatic spindle are collected by the data acquisition instrument. According to the vibration frequency and amplitude change parameters, the dynamic stiffness parameters and the natural frequency (resonance frequency) of the hydrostatic spindle can be output by the data analysis system. The closer the dynamic load frequency is to the natural frequency, the greater the deformation of the hydrostatic spindle, and the worse the dynamic stiffness of the hydrostatic spindle. The natural frequency of the hydrostatic spindle changes with the change of the oil film dynamic stiffness, that is, the natural frequency of the hydrostatic spindle is related to the flow and oil pressure of the hydraulic oil at the inlet and outlet of the restrictor 40. Therefore, by monitoring the dynamic stiffness of the hydrostatic spindle and the flow and oil pressure of the hydraulic oil at the outlet of the restrictor 40, the flow-dynamic stiffness curve and the oil pressure-dynamic stiffness curve can be obtained. When the hydrostatic spindle is designed, appropriate working characteristic parameters of the restrictor 40 can be selected according to the load action frequency, and resonance can be avoided to improve the stability of the hydrostatic spindle.

[0078] Dynamic stiffness is the ability of the hydrostatic bearing 86 to resist deformation under dynamic load, and is generally represented by modal shapes measured by an acceleration sensor and a force hammer. The dynamic stiffness of the hydrostatic spindle is the superposition of the dynamic stiffness of the shaft core 32 and the dynamic stiffness of the oil film, and the key parameters of the dynamic stiffness of the oil film are the oil pressure, oil temperature and flow rate after the throttling effect of the throttling device 40. Therefore, parameter optimization can be performed through test analysis, such as determining the optimal stability of the hydrostatic spindle at which oil pressure and / or oil temperature and / or flow rate, and then adjusting the working characteristics of the throttling device 40 based on the physical characteristics of the hydraulic oil corresponding to the optimal stability to improve the dynamic stiffness of the hydrostatic spindle.

[0079] The rotation accuracy detection assembly includes a measurement support, displacement sensors, double-ball standard rods, a tool holder, and a rotation accuracy analyzer. Specifically, the double-ball standard rods are installed on the tool holder instead of the tool, the tool holder is connected to the hydrostatic spindle through the tool holder, and multiple capacitive displacement sensors are installed in the probe nests of the measurement support to simultaneously measure the axial motion error, radial motion error, and tilt error signals of the hydrostatic spindle. The temperature changes of the hydrostatic spindle during operation are detected by the multiple temperature sensors 64, and the rotation error changes and thermal drift data of the hydrostatic spindle during operation are accurately measured. The rotation error, thermal drift, and other parameters of the hydrostatic spindle are related to the oil film thickness fluctuations during the operation of the hydrostatic spindle. By monitoring and changing the flow rate, oil pressure, and temperature of the hydraulic oil at the outlet of the throttling device 40, a relationship curve between the rotation error and the flow rate, oil pressure, and temperature at the outlet of the throttling device 40 can be output, and the rotation error can be optimized and adjusted according to the relationship curve.

[0080] The torque monitoring device includes a torque sensor connected between the spindle motor 20 and the shaft core 32 through the coupling 21, which is used to monitor the torque of the shaft core 32 at different speeds. The torque of the hydrostatic spindle depends on the oil film resistance of the fixed bearing 33 and the floating bearing 34 as well as the working load. According to the change information of the torque size changing with the oil film resistance and the working load, the torque size of the hydrostatic spindle can be adjusted to the expected target value.

[0081] The data analysis system includes an upper computer, a data monitoring platform, and a collection card. The collection card sends the collected data information of the pressure sensor, the flow sensor 65, the displacement sensor, the torque sensor, the temperature sensor 64, the acceleration sensor, the viscosity sensor, etc. to the data monitoring platform for data processing and monitoring and saving, and performs visual processing through the upper computer, outputs various relationship curves and parameters, and saves the data for easy query and analysis by the test personnel.

[0082] It can be seen that the application embodiment can monitor the inlet oil pressure, outlet oil pressure, temperature, flow, liquid viscosity and other parameters at the inlet and outlet of the flow regulator 40 near the end of the flow regulator 40 without affecting the performance of the liquid static pressure spindle through the throttling adapter 50 of the hydraulic monitoring mechanism. The pressure loss caused by the long oil path or other hydraulic elements in the oil path can be avoided, the measurement result is more accurate, and the pressure sensors are arranged at both ends of the flow sensor 65 to determine whether the hydraulic oil pressure before and after the flow sensor 65 is consistent. If not, the flow sensor 65 with smaller pressure loss can be replaced to avoid the inconsistency between the hydraulic oil entering the static pressure oil chamber and the pressure at the outlet of the flow regulator 40 due to the pressure loss of the flow sensor 65, so as to finally ensure that the dynamic and static characteristic parameters of the liquid static pressure spindle measured are the accurate oil pressure parameters of the corresponding flow regulator 40.

[0083] The oil pressure, temperature and flow of the hydraulic oil at the outlet of the flow regulator 40 are related, acted and influenced by the dynamic stiffness, static stiffness, rotation accuracy, torque and load and other dynamic and static characteristic parameters of the liquid static pressure spindle. The relationship characteristic curve between the oil pressure, temperature and flow of the hydraulic oil and each dynamic and static characteristic parameter can be output through data acquisition and processing by the data analysis system. Based on these relationship characteristic curves, the stiffness, accuracy, reliability and stability of the liquid static pressure spindle can be improved by adjusting the working characteristic parameters of the flow regulator 40.

[0084] For the convenience of description, spatial relative terms such as "above", "upper", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0085] In addition, it should be noted that the use of the terms "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above terms have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0086] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A hydrostatic spindle test device, characterized by, The utility model relates to a liquid static pressure spindle performance testing device, including: Support platform (10); Liquid static pressure spindle, liquid static pressure spindle is arranged on support platform (10), liquid static pressure spindle includes drive part, spindle part and throttler (40), drive part is connected with spindle part, drive part is used to drive spindle part does rotating motion, spindle part includes shell (31), shaft core (32) and liquid static pressure bearing assembly, shaft core (32) is arranged in shell (31) through liquid static pressure bearing assembly, and static pressure oil chamber is arranged between shaft core (32) and liquid static pressure bearing assembly, throttler (40) is arranged on liquid static pressure bearing assembly, throttler (40) is used to return to static pressure oil chamber after throttling treatment to hydraulic oil; Hydraulic monitoring mechanism is used to monitor the hydraulic oil that enters and exits throttler (40) to obtain the working characteristic parameter of throttler (40); Spindle performance detection mechanism, spindle performance detection mechanism is arranged on support platform (10), and spindle performance detection mechanism is used to detect the dynamic and static characteristic parameter of liquid static pressure spindle during the working process of throttler (40); The utility model relates to a liquid static pressure spindle performance testing device, including: Throttling adapter (50), throttling adapter (50) is arranged between liquid static pressure bearing assembly and throttler (40), and channel is arranged in throttling adapter (50), and the hydraulic oil in static pressure oil chamber enters and / or flows out throttler (40) through channel; Monitoring module, monitoring module is connected with throttling adapter (50), and monitoring module is used to monitor the physical characteristic of the hydraulic oil that flows through channel.

2. The hydrostatic spindle testing apparatus of claim 1, wherein, Throttler (40) is provided with oil inlet, and channel includes: First channel (51), one end of first channel (51) is communicated with static pressure oil chamber, and the other end is communicated with oil inlet, and monitoring module is used to monitor the physical characteristic of the hydraulic oil in first channel (51).

3. The hydrostatic spindle testing apparatus of claim 2, wherein, Wherein, First channel (51) is provided with shunt channel (511), and monitoring module includes: First connecting pipeline (60), first connecting pipeline (60) is communicated with shunt channel (511); First pressure sensor (61), first pressure sensor (61) is arranged on first connecting pipeline (60), and first pressure sensor (61) is used to monitor the oil pressure of the hydraulic oil in first channel (51).

4. The hydrostatic spindle testing apparatus of claim 1, wherein, Throttler (40) is also provided with oil outlet, and channel also includes: Second channel (52), one end of second channel (52) is communicated with oil outlet, and monitoring module is used to monitor the physical characteristic of the hydraulic oil that flows into second channel (52) from throttler (40); Third channel (53), one end of third channel (53) is communicated with second channel (52), and the other end is communicated with static pressure oil chamber.

5. The hydrostatic spindle testing apparatus of claim 4, wherein, The second channel (52) and the third channel (53) are communicated through a second connecting pipeline (62), and the monitoring module further comprises: a second pressure sensor (63) arranged on the second connecting pipeline (62), the second pressure sensor (63) being used for monitoring the oil pressure of the hydraulic oil flowing from the flow restrictor (40) into the second channel (52); and / or a temperature sensor (64) arranged on the second connecting pipeline (62), the temperature sensor (64) being used for monitoring the temperature of the hydraulic oil flowing from the flow restrictor (40) into the second channel (52); and / or a flow sensor (65) arranged on the second connecting pipeline (62), the flow sensor (65) being used for monitoring the flow of the hydraulic oil flowing from the flow restrictor (40) into the second channel (52).

6. The hydrostatic spindle testing apparatus of claim 5, wherein, The monitoring module further comprises: a third pressure sensor (66) arranged on the second connecting pipeline (62), the third pressure sensor (66) being used for monitoring the oil pressure of the hydraulic oil flowing through the flow sensor (65).

7. The hydrostatic spindle testing apparatus of any of claims 1 to 6, wherein, The spindle performance detection mechanism comprises: a static stiffness detection assembly connected to the spindle part away from the driving part, the static stiffness detection assembly being used for detecting the static stiffness of the liquid static pressure spindle; and / or a dynamic stiffness detection assembly, the dynamic stiffness detection assembly being used for detecting the dynamic stiffness and / or vibration frequency of the liquid static pressure spindle; and / or a rotation accuracy detection assembly connected to the spindle part away from the driving part, the rotation accuracy detection assembly being used for monitoring the rotation accuracy parameter of the liquid static pressure spindle; and / or a torque sensor connected between the driving part and the shaft core (32) through a shaft coupling, the torque sensor being used for monitoring the torque of the shaft core (32) at different rotation speeds.

8. The hydrostatic spindle testing apparatus of claim 7, wherein, The static stiffness detection assembly comprises: a loading unit comprising a support frame (70), a load transmission part (80) and a load adjusting part (90), the load transmission part (80) being fixed on the support platform (10) through the support frame (70) and being rotatably connected with the shaft core (32), the support frame (70) and the load transmission part (80) having a predetermined installation space therebetween, the load adjusting part (90) being installed in the predetermined installation space and being connected with the load transmission part (80), the load adjusting part (90) being used for applying a pressure load or a tension load to the load transmission part (80); A displacement detection unit including an axial displacement sensor (35) and a radial displacement sensor (36) provided to the main shaft portion, the axial displacement sensor (35) detecting an axial displacement of the shaft core (32), and the radial displacement sensor (36) detecting a radial displacement of the shaft core (32).

9. The hydrostatic spindle testing apparatus of claim 8, wherein, The load adjusting portion (90) includes: A fourth pressure sensor (91); A first support rod (92) provided with a fastener (93), one end of the fastener (93) being rotatably connected with the support frame (70) away from the first support rod (92); A second support rod (94), the fourth pressure sensor (91) being connected between the first support rod (92) and the second support rod (94) through a connecting rod (95), the first support rod (92) being reciprocally movable along the axial direction of the connecting rod (95) relative to the connecting rod (95), and the second support rod (94) being fixedly connected with the load transmission portion (80).

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