An electric spindle test loading device and test apparatus

Abstract

The application discloses a kind of electric spindle test loading device and test equipment, comprising: loading shaft assembly, including body and shaft core, shaft core is arranged in the inner hole of body, the inner hole wall of body is equipped with first air hole, body is equipped with front thrust bearing assembly in the front side of shaft core, front thrust bearing assembly is equipped with second air hole, front thrust bearing assembly is equipped with shaft core connecting hole, body is equipped with rear thrust bearing assembly in the rear side of shaft core, rear thrust bearing assembly is equipped with third air hole, rear thrust bearing assembly is equipped with ball that can be supported in the shaft core from rear side after third air hole breaks air;Axial loading assembly, including driving mechanism, the output end of driving mechanism is connected to body.The application breaks air in third air hole when axial stiffness test, ball is tightly attached to shaft core rear end surface and can provide strong rigid support for loading shaft core, so as to obtain more accurate axial displacement, avoid the error caused by flexible bearing air floating support, ensure data accuracy.

Description

Technical Field

[0001] This invention relates to the field of electric spindle testing, and in particular to an electric spindle testing loading device and testing equipment. Background Technology

[0002] Ultra-precision air-bearing electric spindles are core components in ultra-precision micro-structure milling and grinding machine tools. They are used in the ultra-precision machining of optoelectronic devices, semiconductors, electronics, and high-performance displays. The load-bearing capacity and stiffness directly reflect the spindle's machining accuracy, stability, and operational reliability. Therefore, ultra-precision air-bearing electric spindles need to address the issue of rapid testing of load-bearing capacity and stiffness during mass production. Current technologies utilize non-contact air film loading to improve testing accuracy; however, existing non-contact air film loading functions are relatively limited, and the compressibility of the air film leads to significant errors in axial stiffness testing.

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

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

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

[0006] In a first aspect, an electric spindle testing and loading device includes:

[0007] A loading shaft assembly includes a body and a shaft core. The shaft core is disposed in the inner hole of the body. The inner hole wall of the body is provided with a first air hole 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 connection 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. The rear thrust bearing assembly is provided with balls that can support the shaft core from the rear side after the air is cut off from the third air hole.

[0008] An axial loading assembly includes a drive mechanism, the output end of which is connected to the body and is used to drive the body to move axially along the shaft.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the rear thrust bearing assembly is provided with a ball assembly mounting hole, the ball assembly mounting hole is provided with a ball mounting seat, the ball mounting seat is provided with a ball mounting groove on its inner end face facing the shaft core, the ball is disposed 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-described implementations, in some implementations of the first aspect, the ball bearing mounting base includes a sleeve, the ball bearing mounting groove is disposed on the annular end face of the sleeve, the cross-section of the ball bearing mounting groove is a circle with a notch, the ball bearing is received in the ball bearing mounting groove, and protrudes from the annular end face at the notch position.

[0011] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the loading shaft assembly further includes an air connector, the body is provided with a first air passage connecting the air connector and the first air hole, the front thrust bearing assembly is provided with a second air passage connecting the air connector and the second air hole, the rear thrust bearing assembly is provided with a third air passage connecting the air connector 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 passage.

[0012] In conjunction with the first aspect and the above-described implementations, in some implementations 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. The second air passage connects the air connector 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 passage connects the air connector and the second annular groove.

[0013] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the driving mechanism includes a lead screw, a guide rail, and a slider disposed on the guide rail and cooperating with the lead screw. One end of the lead screw is provided with a rocker wheel, and the machine body is connected to the slider.

[0014] Secondly, an electric spindle testing device includes:

[0015] The electric spindle test loading device described in any of the implementations of the first aspect;

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

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

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

[0019] In combination with the second aspect and the above-described implementations, some implementations of the second aspect include the electric spindle test loading device described in some implementations of the first aspect, wherein the drive mechanism is disposed on the bottom mounting base, and the displacement sensor is disposed on the bottom mounting base and axially toward the slider.

[0020] In combination with the second aspect and the above implementation methods, some implementation methods of the second aspect also include a base, wherein the measured shaft fixing seat is disposed on the base by an insulating pad, 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 testing loading device of the present invention can be used to test the load-bearing capacity and axial stiffness of an electric spindle. Specifically, during the load-bearing capacity test, the spindle body under test is connected to the core of the loading shaft assembly. The loading shaft assembly is connected to an air source, and gas is ejected through a first air hole, a second air hole, and a third air hole, forming a radial air film between the machine body and the core, a front axial air film between the front thrust bearing assembly and the core, and a rear axial air film between the rear thrust bearing assembly and the core, supporting the core in a suspended state. Then, the axial loading assembly is driven axially by its drive mechanism, causing it to apply an axial force to the spindle body under test. During the axial stiffness test, the third air hole is shut off, and the balls of the rear thrust bearing assembly provide support to the core, further causing the loading shaft assembly to apply an axial force to the spindle body under test.

[0022] The technical solution of this invention, on the one hand, uses an air-bearing 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 axial stiffness testing, the third air hole is cut off, the air-bearing support force of the flexible load-bearing structure disappears, and the shaft core is directly supported by the ball bearings. The ball bearings are in close contact with 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, thereby obtaining more accurate axial displacement, avoiding the errors caused by the air-bearing support of the flexible load-bearing structure, and ensuring data accuracy.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

[0025] Figure 1 This is a top view 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 diagram of an embodiment of the loading axis assembly of the present invention;

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

[0029] Figure 5 This is a schematic diagram of the body structure of an embodiment of the loading shaft assembly of the present invention. Detailed Implementation

[0030] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

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

[0032] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0034] in, Figure 3 The reference direction coordinate system of this invention is given below, in conjunction with... Figure 3 The directions shown illustrate embodiments of the present invention.

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

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

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

[0038] The technical solution of this invention, on the one hand, uses an air-bearing 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 axial stiffness testing, the third air hole 108 is cut off, the air-bearing support force of the flexible load disappears, and the bearing 102 is directly supported by the ball bearings 109. The ball bearings 109 are in close contact with the rear end face of the bearing 102 and can provide strong rigid support for the loading shaft bearing 102. At the same time, the bearing 102 can also rotate, thereby obtaining more accurate axial displacement, avoiding the error caused by the air-bearing 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 bearing mounting hole 110, in which a ball bearing mounting seat 111 is provided. The ball bearing mounting seat 111 has a ball bearing mounting groove on its inner end face facing the shaft core 102. The ball 109 is disposed in the ball bearing mounting groove and protrudes from the inner wall surface of the rear thrust bearing assembly 107. This ensures that when the third vent 108 of the rear thrust bearing assembly 107 is vented, 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 surface of the rear thrust bearing assembly 107. By providing the ball bearing mounting seat 111 in the rear thrust bearing assembly 107, the axial installation position of the ball bearing mounting seat 111 can be precisely adjusted.

[0040] Further, see Figure 3 , Figure 4The ball bearing mounting base 111 includes a sleeve, and a ball bearing mounting groove is disposed on the annular end face of the sleeve. The cross-section of the ball bearing mounting groove is a circle with a notch. The ball bearing 109 is received in the ball bearing mounting groove and protrudes from the annular end face at the notch. At the same time, the ball bearing mounting groove with a constricting structure prevents the ball bearing from falling out of the sleeve. In this embodiment, multiple balls bearing 109 are disposed along the annular end face of the sleeve, which can provide stable multi-point support for the rear end of the shaft core 102, improve the stability of the rigid support, and reduce the measurement error of the axial stiffness test.

[0041] In some embodiments, see Figure 3 , Figure 5 The loading shaft assembly 100 also includes an air connector 112. The body 101 is provided with a first air passage 113 connecting the air connector 112 and the first air hole 103. The front thrust bearing assembly 104 is provided with a second air passage (not shown in the figure) connecting the air connector 112 and the second air hole 105. The rear thrust bearing assembly 107 is provided with a third air passage 114 connecting the air connector 112 and the third air hole 108. The rear thrust bearing assembly 107 is provided with a control knob 115 for controlling the opening and closing of the third air passage 114. In this embodiment, the gas from the first air hole 103, the second air hole 105, and the third air hole 108 are all connected through the air connector 112, which is convenient to use. However, the third air hole 108 of the rear thrust bearing assembly 107 is controlled by an independent control knob 115, which facilitates switching between load-bearing 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 face 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 face 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 face. The second air passage connects the air connector 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 face 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 face 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 face. The third air passage 114 connects the air connector 112 and the second annular groove 121. The ball bearing assembly mounting hole 110 is located in the middle of the rear thrust bearing assembly 107, and the third air hole 108 is located around the ball bearing assembly mounting hole 110. In this embodiment, the airflow introduced through the air connector 112 is distributed to multiple air holes through the annular groove, thereby forming a more stable axial air film.

[0043] The drive mechanism can be a motor, cylinder, etc. See also the following embodiments: 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. One end of the lead screw 201 is equipped with a rocker wheel 204, and the machine body 101 is connected to the slider 203. During loading or testing, the rocker wheel 204 can be turned to move the load-bearing capacity and stiffness testing loading components to the left and right 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 test spindle fixing base 300, a sensor, and an electric spindle testing loading device as described in any of the above embodiments; wherein, the test spindle fixing base 300 is used to install the electric spindle 400 400 corresponding to the spindle core connection hole 106 on the axial front side of the loading spindle 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 on the spindle core 102, and the displacement sensor 502 is used to detect the axial displacement of the spindle core 102.

[0045] During the load-bearing capacity test, the shaft of the tested electric spindle 400 is connected to the core 102 of the loading shaft assembly 100. The control cabinet 601 provides a certain current or voltage to the tested electric spindle 400 through the cable 602. Then, the axial loading assembly 100 is driven axially by the drive mechanism of the axial loading assembly 200, so that the loading shaft assembly 100 applies axial force to the shaft of the tested electric spindle 400. During this process, once the shaft of the tested electric spindle 400 is connected to the machine body 101, the receiving device in the pressure sensor 501 receives the voltage or current and sends the force value information to the control cabinet 601. At this time, it is the maximum value of the push or pull force in the corresponding axial direction, which is the load-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 ventilated state, after tightening the air control knob 115 at the rear end of the loading shaft assembly 100, the support force of the flexible bearing unit of the rear thrust bearing assembly 107 disappears. The shaft core 102 of the loading shaft is pushed by the thrust of the front thrust bearing assembly 116 104 to contact the extremely rigid ball bearing 109 on the rear thrust bearing assembly 107. At this time, the ball bearing 109 is in close contact with the rear end face of the shaft core 102 and can provide strong rigid support for the loading shaft core 102, while the shaft core 102 can also rotate. Then, the loading shaft assembly 100 is driven axially by the drive mechanism of the axial loading assembly 200. The displacement sensor 502 and the pressure sensor 501 transmit displacement and force data to the control cabinet 601 in real time. The control cabinet 601 calculates the axial stiffness of the measured shaft through logical conversion (stiffness and displacement), and finally displays it on the screen of the control cabinet 601.

[0047] In some embodiments, see Figure 1 , Figure 2 , Figure 3 The electric spindle testing loading device also includes a connecting rod 122, which is coaxially connected to the spindle core 102. A pressure sensor 501 is connected between the connecting rod 122 and the spindle core 102. The pressure sensor 501 can be a wireless pressure sensor. During testing, the rocker wheel 204 at one end is turned, and the ball screw 201 and slider 203 move the load-bearing shaft assembly 100 forward a suitable distance. Then, the connecting rod 122 is placed into the electric spindle 400 under test in the tool-released state. After the electric spindle 400 under test is pulled back, the spindle core 102 of the electric spindle 400 under test can be manually turned (in static conditions) or driven (in dynamic conditions) to rotate the connecting rod 122, the wireless pressure sensor 501, and the spindle core 102 of the loading shaft assembly 100 together.

[0048] Understandably, the pressure sensor 501 can also be located in other positions, such as between the slider 203 and the body 101.

[0049] In some embodiments, see Figure 2 The drive mechanism is located on the bottom mounting base 205, and the displacement sensor 502 is located on the bottom mounting base 205 and is axially oriented toward the slider 203.

[0050] In some embodiments, a base 700 is also included, and the measured shaft fixing seat 300 is disposed on the base 700 via an insulating pad 301. The ball bearing 109 is a ceramic ball bearing. In this scheme, the shaft core 102 of the loading shaft assembly 100 is floated and insulated from the outside world to avoid interfering with the wireless pressure sensor 501 receiving and transmitting various signals.

[0051] In some embodiments, see Figure 1 , Figure 2 The test spindle fixing seat 300 is equipped with a first clamp 302 for mounting the test electric spindle 400, and the slider 203 is equipped with a second clamp 206 for mounting the machine body 101. The clamps enable quick mounting of the test electric spindle 400 and the machine body 101.

[0052] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above 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 one or more embodiments or examples.

[0053] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An electric spindle testing and loading device, characterized in that, include: A loading shaft assembly includes a body and a shaft core. The shaft core is disposed in the inner hole of the body. The inner hole wall of the body is provided with a first air hole 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 connection 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. The rear thrust bearing assembly is provided with balls that can support the shaft core from the rear side after the air is cut off from the third air hole. An axial loading assembly includes a drive mechanism, the output end of which is connected to the body and is used to drive the body to move axially along the shaft core. The rear thrust bearing assembly is provided with a ball assembly mounting hole, and a ball mounting seat is provided in the ball assembly mounting hole. The ball mounting seat has a ball mounting groove on its inner end face facing the shaft core. The ball is disposed in the ball mounting groove and protrudes from the inner wall surface of the rear thrust bearing assembly.

2. The electric spindle testing and loading device according to claim 1, characterized in that, The ball bearing mounting base includes a sleeve, and the ball bearing mounting groove is disposed on the annular end face of the sleeve. The cross-section of the ball bearing mounting groove is a circle with a notch. The ball bearing is received in the ball bearing mounting groove and protrudes from the annular end face at the notch position.

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

4. The electric spindle testing and loading device according to claim 3, 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 passages connect the air connector 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 passages connect the air connector and the second annular groove.

5. The electric spindle testing and loading device according to claim 1, characterized in that, The drive mechanism includes a lead screw, a guide rail, and a slider disposed on the guide rail and cooperating with the lead screw. One end of the lead screw is provided with a rocker wheel, and the machine body is connected to the slider.

6. An electric spindle testing device, characterized in that, include: The electric spindle test loading device according to any one of claims 1 to 5; The test spindle fixing seat is used to install the test electric spindle corresponding to the spindle core connection hole on the axial front side of the loading shaft assembly; The sensor includes a pressure sensor and a displacement sensor, wherein the pressure sensor is used to detect the axial pressure on the shaft core, and the displacement sensor is used to detect the axial displacement of the shaft core.

7. The electric spindle testing equipment according to claim 6, characterized in that, The electric spindle test loading device also includes a connecting rod, which is coaxially connected to the spindle core, and the pressure sensor is connected between the connecting rod and the spindle core.

8. The electric spindle testing equipment according to claim 6, characterized in that, The device includes the electric spindle test loading device as described in claim 5, wherein the drive mechanism is disposed on the bottom mounting base, and the displacement sensor is disposed on the bottom mounting base and axially toward the slider.

9. The electric spindle testing equipment according to claim 6, characterized in that, It also includes a base, the measured shaft fixing seat is set on the base by an insulating pad, and the ball is a ceramic ball.

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