Electric spindle test loading device and test equipment

Abstract

The invention discloses an electric spindle test loading device and test equipment, and the device comprises a loading shaft assembly which comprises a machine body and a shaft core, the shaft core is arranged in an inner hole of the machine body, the wall of the inner hole of the machine body is provided with a first air hole, the machine body is provided with a front thrust bearing assembly at the front side of the shaft core, and the front thrust bearing assembly is provided with a second air hole; the front thrust bearing assembly is provided with a shaft core connecting hole, the machine body is provided with a rear thrust bearing assembly on the rear side of the shaft core, the rear thrust bearing assembly is provided with a third air hole, and the rear thrust bearing assembly is provided with a ball capable of being supported on the shaft core from the rear side after air of the third air hole is cut off. And the axial loading assembly comprises a driving mechanism, and the output end of the driving mechanism is connected to the machine body. During axial rigidity testing, the third air hole is cut off, the ball is tightly attached to the rear end face of the shaft core, and powerful rigid support can be provided for the shaft core of the loading shaft, so that more accurate axial displacement can be obtained, errors caused by air floating support of flexible bearing are avoided, and data accuracy is guaranteed.

Description

Technical Field

[0001] The invention is used in the field of electric spindle testing, and particularly relates to an electric spindle testing loading device and testing equipment. Background Art

[0002] The ultra-precision air-bearing electric spindle is a core component of ultra-precision microstructure milling and grinding machines. It can be used for ultra-precision processing of optoelectronic devices, semiconductors, electronics, high-performance displays and other products. The bearing capacity and stiffness indicators directly reflect the processing accuracy, stability and operational reliability of the spindle. Therefore, the ultra-precision air-bearing electric spindle needs to solve the problem of rapid detection of bearing capacity and stiffness in large-scale production of spindles. At present, there is a method of using non-contact air film loading in the existing technology to improve the test accuracy. However, the existing non-contact air film loading function is relatively simple, and the test of axial stiffness results in a large error in stiffness testing due to the compressibility of the air film.

[0003] In summary, the problems existing in the relevant technologies need to be solved urgently. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an electric spindle test loading device and a test equipment.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] In a first aspect, an electric spindle test loading device comprises:

[0007] A loading shaft assembly comprises a body and a shaft core, wherein the shaft core is arranged in an inner hole of the body, a first air hole is provided on the inner hole wall of the body for forming a radial air film, the body is provided with a front thrust bearing assembly on the front side of the shaft core, the front thrust bearing assembly is provided with a second air hole for forming a front axial air film, the front thrust bearing assembly is provided with a shaft core connecting hole, the body is provided with a rear thrust bearing assembly on the rear side of the shaft core, the rear thrust bearing assembly is provided with a third air hole for forming a rear axial air film, and the rear thrust bearing assembly is provided with a ball capable of supporting the shaft core from the rear side after the third air hole is de-energized;

[0008] The axial loading assembly comprises a driving mechanism, wherein the output end of the driving mechanism is connected to the machine body and is used for driving the machine body to move axially along the shaft core.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the rear thrust bearing assembly is provided with a ball assembly mounting hole, a ball mounting seat is provided in the ball assembly mounting hole, the ball mounting seat is provided with a ball mounting groove on the inner end surface facing the shaft core, the ball is arranged in the ball mounting groove and protrudes from the inner wall surface of the rear thrust bearing assembly.

[0010] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, the ball mounting seat includes a sleeve, the ball mounting groove is arranged on the annular end surface of the sleeve, the cross-section of the ball mounting groove is circular with a notch, the ball is accommodated in the ball mounting groove, and protrudes from the annular end surface at the notch position.

[0011] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, the loading shaft assembly also includes an air joint, the body is provided with a first air channel connecting the air joint and the first air hole, the front thrust bearing assembly is provided with a second air channel connecting the air joint and the second air hole, the rear thrust bearing assembly is provided with a third air channel connecting the air joint and the third air hole, and the rear thrust bearing assembly is provided with an air control knob for controlling the opening and closing of the third air channel.

[0012] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, the front thrust bearing assembly includes a front thrust bearing and a front cover plate, the front end face of the front thrust bearing is provided with a first annular groove, the front cover plate is connected to the front end face of the front thrust bearing and covers the first annular groove, the front thrust bearing is provided with a plurality of second air holes extending from the first annular groove to the rear end face, and the second air duct connects the air joint and the first annular groove, the rear thrust bearing assembly includes a rear thrust bearing and a rear cover plate, the rear end face of the rear thrust bearing is provided with a second annular groove, the rear cover plate is connected to the rear end face of the rear thrust bearing and covers the second annular groove, the rear thrust bearing is provided with a plurality of third air holes extending from the second annular groove to the front end face, and the third air duct connects the air joint and the second annular groove.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the driving mechanism includes a screw, a guide rail and a slider arranged on the guide rail and cooperating with the screw, a rocker is provided at one end of the screw, and the body is connected to the slider.

[0014] In a second aspect, an electric spindle testing device comprises:

[0015] The electric spindle test loading device according to any implementation of the first aspect;

[0016] A measured shaft fixing seat is used to install the measured electric spindle corresponding to the shaft core connecting hole on the axial front side of the loading shaft assembly;

[0017] The sensor includes a pressure sensor and a displacement sensor. The pressure sensor is used to detect the axial pressure applied to the shaft core, and the displacement sensor is used to detect the axial displacement of the shaft core.

[0018] In combination with the second aspect, in certain implementations of the second aspect, the electric spindle test loading device further includes a connecting rod, the connecting rod is coaxially connected to the shaft core, and the pressure sensor is connected between the connecting rod and the shaft core.

[0019] In combination with the second aspect and the above-mentioned implementations, in certain implementations of the second aspect, including the electric spindle test loading device described in certain implementations of the first aspect, the driving mechanism is arranged on the bottom mounting seat, and the displacement sensor is arranged on the bottom mounting seat and axially toward the slider.

[0020] In combination with the second aspect and the above-mentioned implementation manner, in some implementation manners of the second aspect, a base is further included, the measured shaft fixing seat is set on the base through an insulating spacer, and the ball is a ceramic ball.

[0021] One of the above technical solutions has at least one of the following advantages or beneficial effects: the electric spindle test loading device of the present invention can be used to test the load-bearing capacity and axial stiffness of the electric spindle. When performing a load-bearing capacity test, the shaft of the electric spindle under test is connected to the shaft core of the loading shaft assembly. The loading shaft assembly is connected to an air source, and gas is ejected through the first, second, and third air holes, forming a radial air film between the body and the shaft core, a front axial air film between the front thrust bearing assembly and the shaft core, and a rear axial air film between the rear thrust bearing assembly and the shaft core, supporting the shaft core in a suspended state. The loading shaft assembly is then driven axially by the driving mechanism of the axial loading assembly, causing the loading shaft assembly to apply an axial force to the shaft of the electric spindle under test in the axial direction. When performing an axial stiffness test, the third air hole is deactivated, and the balls of the rear thrust bearing assembly provide support for the shaft core, further causing the loading shaft assembly to apply an axial force to the shaft of the electric spindle under test in the axial direction.

[0022] On the one hand, the technical solution of the present invention adopts an air-floating loading shaft assembly to reduce the coaxiality error between the tested electric spindle and the loading shaft, making the measured load-bearing capacity more accurate. On the other hand, during the axial stiffness test, the third air hole is cut off, the air-floating support force of the flexible load disappears, and the shaft core is directly supported by the ball. The ball is tightly attached to the rear end face of the shaft core and can provide strong rigid support for the loading shaft core. At the same time, the shaft core can also rotate, so that a more accurate axial displacement can be obtained, avoiding the error caused by the air-floating support of the flexible load, and ensuring data accuracy.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a top view of the structure of an embodiment of the electric spindle testing equipment of the present invention;

[0026] Figure 2 This is a front view of the structure of an embodiment of the electric spindle testing equipment of the present invention;

[0027] Figure 3 This is a schematic structural diagram of an embodiment of a loading shaft assembly of the present invention;

[0028] Figure 4 It is a partial structural diagram of an embodiment of a rear thrust bearing assembly of the present invention;

[0029] Figure 5 It is a schematic diagram of the body structure of an embodiment of the loading shaft assembly of the present invention. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0031] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0032] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0033] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] in, Figure 3 The reference direction coordinate system of the embodiment of the present invention is given below. Figure 3 The embodiment of the present invention is described with reference to the direction shown.

[0035] See also Figure 1-Figure 5 An embodiment of the present invention provides an electric spindle test loading device, including a loading shaft assembly 100 and an axial loading assembly 200, wherein the loading shaft assembly 100 includes a body 101 and a shaft core 102, the shaft core 102 is arranged in the inner hole of the body 101, the inner hole wall of the body 101 is provided with a first air hole 103 for forming a radial air film, the body 101 is provided with a front thrust bearing assembly 104 on the front side of the shaft core 102, the front thrust bearing assembly 104 is provided with a second air hole 105 for forming a front axial air film, and the front thrust bearing assembly 104 is provided with a shaft core connecting hole 106, the electric spindle to be tested The shaft body can be connected to the shaft core 102 through the shaft core connecting hole 106. The body 101 is provided with a rear thrust bearing assembly 107 on the rear side of the shaft core 102. The rear thrust bearing assembly 107 is provided with a third air hole 108 for forming a rear axial air film. The rear thrust bearing assembly 107 is provided with a ball 109 that can be supported on the shaft core 102 from the rear side after the third air hole 108 is cut off. In other words, in an embodiment of the present invention, the rear thrust bearing assembly 107 can provide two load-bearing modes: non-contact flexible load-bearing and non-contact rigid load-bearing, so as to respectively meet the loading requirements of the load-bearing capacity test loading and the axial stiffness test.

[0036] The axial loading assembly 200 is used to implement the application of axial loading force. The axial loading assembly 200 includes a driving mechanism, the output end of which is connected to the body 101 and is used to drive the body 101 to move axially (including forward and backward) along the shaft core 102.

[0037] Combine Figure 1 、 Figure 2 、 Figure 3 、 Figure 4The electric spindle test loading device of the present invention can be used to test the load-bearing capacity test loading and axial stiffness test loading of the electric spindle. When carrying out the load-bearing capacity test, the shaft body of the electric spindle to be tested is connected to the shaft core 102 of the loading shaft assembly 100, and the loading shaft assembly 100 is connected to the gas source. The gas is ejected through the first air hole 103, the second air hole 105, and the third air hole 108, and a radial air film is formed between the body 101 and the shaft core 102, a front axial air film is formed between the front thrust bearing assembly 104 and the shaft core 102, and a rear axial air film is formed between the rear thrust bearing assembly 107 and the shaft core 102, supporting the shaft core 102 in a suspended state. Then, the loading shaft assembly 100 is driven axially by the driving mechanism of the axial loading assembly 200, so that the loading shaft assembly 100 applies an axial force to the shaft body of the electric spindle to be tested axially. When conducting the axial stiffness test, the third air hole 108 is shut off, and the ball 109 of the rear thrust bearing assembly 107 provides support for the shaft core 102, further enabling the loading shaft assembly 100 to apply axial force to the shaft body of the tested electric spindle along the axial direction.

[0038] On the one hand, the technical solution of the present invention adopts an air-floating loading shaft assembly 100 to reduce the coaxiality error between the tested electric spindle and the loading shaft, making the measured load-bearing capacity more accurate. On the other hand, during the axial stiffness test, the third air hole 108 is cut off, the air-floating support force of the flexible load disappears, and the shaft core 102 is directly supported by the ball 109. The ball 109 is tightly attached to the rear end face of the shaft core 102 and can provide strong rigid support for the loading shaft core 102. At the same time, the shaft core 102 can also rotate, so that a more accurate axial displacement can be obtained, avoiding the error caused by the air-floating support of the flexible load, and ensuring data accuracy.

[0039] In some embodiments, see Figure 3 、 Figure 4 The rear thrust bearing assembly 107 is provided with a ball assembly mounting hole 110, in which a ball mounting seat 111 is provided. The ball mounting seat 111 has a ball mounting groove on the inner end surface facing the shaft core 102. The ball 109 is disposed in the ball mounting groove and protrudes from the inner wall of the rear thrust bearing assembly 107. This ensures that when the third air hole 108 of the rear thrust bearing assembly 107 is ventilated, a rear axial air film can be formed between the shaft core 102 and the rear thrust bearing assembly 107, and the thickness of the rear axial air film is greater than the height of the ball 109 protruding from the inner wall of the rear thrust bearing assembly 107. By providing the ball mounting seat 111 in the rear thrust bearing assembly 107, the axial installation position of the ball mounting seat 111 can be precisely adjusted.

[0040] Further, see Figure 3 、 Figure 4Ball mounting seat 111 comprises a sleeve, with a ball mounting groove disposed in the sleeve's annular end surface. The groove's cross-section is circular with a notch. Ball 109 is received within the groove and protrudes from the annular end surface at the notch. The ball mounting groove, with its closed end structure, prevents the ball from falling out of the sleeve. In this embodiment, multiple balls 109 are disposed along the sleeve's annular end surface, providing stable multi-point support for the rear end of shaft core 102, enhancing the stability of the rigid support and reducing measurement errors during axial stiffness testing.

[0041] In some embodiments, see Figure 3 、 Figure 5 The loading shaft assembly 100 further includes a gas connector 112. The body 101 is provided with a first gas passage 113 connecting the gas connector 112 and the first gas hole 103. The front thrust bearing assembly 104 is provided with a second gas passage (not shown) connecting the gas connector 112 and the second gas hole 105. The rear thrust bearing assembly 107 is provided with a third gas passage 114 connecting the gas connector 112 and the third gas hole 108. The rear thrust bearing assembly 107 is provided with a gas control knob 115 for controlling the opening and closing of the third gas passage 114. In this embodiment, the gas of the first gas hole 103, the second gas hole 105, and the third gas hole 108 are all connected through the gas connector 112, which is convenient for use. However, the third gas hole 108 of the rear thrust bearing assembly 107 is controlled by an independent gas control knob 115, which facilitates switching between load capacity testing and axial stiffness testing.

[0042] In some embodiments, see Figure 3 The front thrust bearing assembly 104 includes a front thrust bearing 116 and a front cover plate 117. The front end surface of the front thrust bearing 116 is provided with a first annular groove 118. The front cover plate 117 is connected to the front end surface of the front thrust bearing 116 and covers the first annular groove 118. The front thrust bearing 116 is provided with a plurality of second air holes 105 extending from the first annular groove 118 to the rear end surface. The second air duct is connected to the air joint 112 and the first annular groove 118. The rear thrust bearing assembly 107 includes a rear thrust bearing 119 and a rear cover plate 120. The rear end surface of the rear thrust bearing 119 is provided with a second annular groove 121. The rear cover plate 120 is connected to the rear end surface of the rear thrust bearing 119 and covers the second annular groove 121. The rear thrust bearing 119 is provided with a plurality of third air holes 108 extending from the second annular groove 121 to the front end surface. The third air duct 114 is connected to the air joint 112 and the second annular groove 121. The ball assembly mounting hole 110 is located in the middle of the rear thrust bearing assembly 107, and the third air hole 108 is located on the periphery of the ball assembly mounting hole 110. In this embodiment, the airflow entering the air connector 112 is distributed to the multiple air holes via the annular groove, thereby forming a more stable axial air film.

[0043] The driving mechanism may be a motor, a cylinder, etc. In some embodiments, see Figure 1 、 Figure 2 The drive mechanism includes a lead screw 201, a guide rail 202, and a slider 203 mounted on the guide rail 202 and cooperating with the lead screw 201. A rocker 204 is provided at one end of the lead screw 201, and the body 101 is connected to the slider 203. During loading or testing, the rocker 204 can be toggled to move the load-bearing and stiffness test loading components leftward and rightward, respectively, via the lead screw 201 and the slider 203.

[0044] An embodiment of the present invention also provides an electric spindle testing device, including a tested shaft fixing seat 300, a sensor and an electric spindle testing loading device in any of the above embodiments; wherein, the tested shaft fixing seat 300 is used to install the tested electric spindle 400 corresponding to the shaft core connecting hole 106 on the axial front side of the loading shaft assembly 100; the sensor includes a pressure sensor 501 and a displacement sensor 502, the pressure sensor 501 is used to detect the axial pressure exerted on the shaft core 102, and the displacement sensor 502 is used to detect the axial displacement of the shaft core 102.

[0045] Among them, when conducting the bearing capacity test, the shaft body of the tested electric spindle 400 is connected to the shaft core 102 of the loading shaft assembly 100, and the control cabinet 601 provides a certain current or voltage to the tested electric spindle 400 through the cable 602, and then drives the loading shaft assembly 100 axially through the driving mechanism of the axial loading assembly 200, so that the loading shaft assembly 100 applies axial force to the shaft body of the tested electric spindle 400 in the axial direction. During this period, once the shaft body of the tested electric spindle 400 is connected to the body 101, the receiving device in the pressure sensor 501 receives the voltage or current, and then sends the force value information to the control cabinet 601. At this time, it is the maximum value of the push and pull force in the axial direction, which is the bearing capacity of the tested electric spindle 400.

[0046] Similarly, when measuring axial stiffness, the displacement sensor 502 probe monitors the distance between itself and the side of the loading shaft assembly 100 in real time. In the ventilation state, tightening the air control knob 115 at the rear end of the loading shaft assembly 100 eliminates the supporting force of the flexible bearing unit of the rear thrust bearing assembly 107. The thrust of the front thrust bearing 116 assembly 104 pushes the loading shaft core 102 into contact with the extremely rigid ball bearing 109 on the rear thrust bearing assembly 107. At this point, the ball bearing 109 clings tightly to the rear end surface of the core 102, providing strong rigid support for the loading shaft core 102 while also allowing the core 102 to rotate. The driving mechanism of the axial loading assembly 200 then drives the loading shaft assembly 100 axially. The displacement sensor 502 and pressure sensor 501 transmit displacement and force data, respectively, in real time to the control cabinet 601. The control cabinet 601 performs a logical conversion (stiffness and displacement) to determine the axial stiffness of the measured shaft, which is ultimately displayed on the control cabinet 601 screen.

[0047] In some embodiments, see Figure 1 、 Figure 2 、 Figure 3 The electric spindle test loading device also includes a connecting rod 122, which is coaxially connected to the shaft core 102. The pressure sensor 501 is connected between the connecting rod 122 and the shaft core 102. The pressure sensor 501 can be a wireless pressure sensor. During testing, after the rocker 204 at one end is moved forward a suitable distance with the bearing force and the loading shaft assembly 100 through the lead screw 201 slider 203, the connecting rod 122 is placed into the electric spindle 400 under test in the tool-loosening state. After the electric spindle 400 under test has broached the tool, the shaft core 102 of the electric spindle 400 under test can be manually moved (in static state) or driven (in dynamic drive state) to drive the connecting rod 122, the wireless pressure sensor 501, and the shaft core 102 of the loading shaft assembly 100 to rotate together.

[0048] It is understandable that the pressure sensor 501 may also be disposed at other locations, such as between the slider 203 and the body 101 .

[0049] In some embodiments, see Figure 2 The driving mechanism is disposed on the bottom mounting seat 205 , and the displacement sensor 502 is disposed on the bottom mounting seat 205 and faces the slider 203 along the axial direction.

[0050] In some embodiments, a base 700 is further included. The measured shaft mounting base 300 is mounted on the base 700 via an insulating spacer 301. The balls 109 are ceramic balls. In this embodiment, the core 102 of the loading shaft assembly 100 floats and is insulated from the outside world, preventing interference with the wireless pressure sensor 501 receiving and transmitting various signals.

[0051] In some embodiments, see Figure 1 、 Figure 2 The tested shaft fixing seat 300 is provided with a first clamp 302 for mounting the tested electric spindle 400, and the slider 203 is provided with a second clamp 206 for mounting the machine body 101. By means of the clamp, the tested electric spindle 400 and the machine body 101 can be clamped quickly.

[0052] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0053] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An electric spindle test loading device, characterized in that: include: A loading shaft assembly comprises a body and a shaft core, wherein the shaft core is arranged in an inner hole of the body, a first air hole is provided on the inner hole wall of the body for forming a radial air film, the body is provided with a front thrust bearing assembly on the front side of the shaft core, the front thrust bearing assembly is provided with a second air hole for forming a front axial air film, the front thrust bearing assembly is provided with a shaft core connecting hole, the body is provided with a rear thrust bearing assembly on the rear side of the shaft core, the rear thrust bearing assembly is provided with a third air hole for forming a rear axial air film, and the rear thrust bearing assembly is provided with a ball capable of supporting the shaft core from the rear side after the third air hole is de-energized; The axial loading assembly comprises a driving mechanism, wherein the output end of the driving mechanism is connected to the machine body and is used for driving the machine body to move axially along the shaft core.

2. The electric spindle test loading device according to claim 1, characterized in that: The rear thrust bearing assembly is provided with a ball assembly mounting hole, a ball mounting seat is provided in the ball assembly mounting hole, and the ball mounting seat is provided with a ball mounting groove on the inner end surface facing the shaft core. The ball is arranged in the ball mounting groove and protrudes from the inner wall surface of the rear thrust bearing assembly.

3. The electric spindle test loading device according to claim 2, characterized in that: The ball mounting seat includes a sleeve, the ball mounting groove is arranged on the annular end surface of the sleeve, the cross section of the ball mounting groove is circular with a notch, the ball is accommodated in the ball mounting groove and protrudes from the annular end surface at the notch position.

4. The electric spindle test loading device according to claim 1, characterized in that: The loading shaft assembly also includes an air joint, the body is provided with a first air channel connecting the air joint and the first air hole, the front thrust bearing assembly is provided with a second air channel connecting the air joint and the second air hole, the rear thrust bearing assembly is provided with a third air channel connecting the air joint and the third air hole, and the rear thrust bearing assembly is provided with an air control knob for controlling the opening and closing of the third air channel.

5. The electric spindle test loading device according to claim 4, characterized in that: The front thrust bearing assembly includes a front thrust bearing and a front cover plate. The front end face of the front thrust bearing is provided with a first annular groove. The front cover plate is connected to the front end face of the front thrust bearing and covers the first annular groove. The front thrust bearing is provided with a plurality of second air holes extending from the first annular groove to the rear end face. The second air duct connects the air joint and the first annular groove. The rear thrust bearing assembly includes a rear thrust bearing and a rear cover plate. The rear end face of the rear thrust bearing is provided with a second annular groove. The rear cover plate is connected to the rear end face of the rear thrust bearing and covers the second annular groove. The rear thrust bearing is provided with a plurality of third air holes extending from the second annular groove to the front end face. The third air duct connects the air joint and the second annular groove.

6. The electric spindle test loading device according to claim 1, characterized in that: The driving mechanism includes a lead screw, a guide rail, and a slider arranged on the guide rail and matched with the lead screw. A rocker is provided at one end of the lead screw, and the machine body is connected to the slider.

7. An electric spindle testing device, characterized in that: include: The electric spindle test loading device according to any one of claims 1 to 6; A measured shaft fixing seat is used to install the measured electric spindle corresponding to the shaft core connecting hole on the axial front side of the loading shaft assembly; The sensor includes a pressure sensor and a displacement sensor. The pressure sensor is used to detect the axial pressure applied to the shaft core, and the displacement sensor is used to detect the axial displacement of the shaft core.

8. The electric spindle testing device according to claim 7, characterized in that: The electric spindle test loading device further includes a connecting rod, which is coaxially connected to the shaft core, and the pressure sensor is connected between the connecting rod and the shaft core.

9. The electric spindle testing device according to claim 7, characterized in that: It includes the electric spindle test loading device according to claim 5, wherein the driving mechanism is arranged on the bottom mounting seat, and the displacement sensor is arranged on the bottom mounting seat and axially faces the slider.

10. The electric spindle testing device according to claim 7, characterized in that: It also includes a base, the measured shaft fixing seat is arranged on the base through an insulating spacer, and the ball is a ceramic ball.

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