TW202314214A - Spring abutment pillar and fan inspection jig using the spring abutment pillar - Google Patents

Abstract

A spring abutment pillar and a fan inspection jig using the spring abutment pillar are disclosed. The fan inspection jig includes a jig assembly having multiple spring abutment pillars for holding two sides of a fan (or a series fan) to make the fan or the series fan positioned in a suspending position. Each of the multiple spring abutment pillars has a front end and a rear end respectively disposed at the two ends and a elastic member connecting the front end and the rear end. A vibration sensor is disposed in at least one of the spring abutment pillars of two sides of the fan for measuring a vibration signal of the fan in operation.

Description

The spring top column of the fan detection jig and the fan detection jig

The invention relates to the field of jigs, in particular to a spring top column of a fan testing jig and the fan testing jig.

Fan vibration inspection is to check the vibration value generated by each fan of the same model or specification, and then eliminate the fans with unreasonable ideal vibration value, so as to ensure the quality of the produced fans. Traditionally, an accelerometer is used to fix an accelerometer on the fan frame, for example, by perforating and locking or pasting, so as to measure the vibration value generated by the fan when it is running. Alternatively, the fan is placed on a vibration bearing platform or a suction cup, and the accelerometer is set on the bearing platform or the suction cup to measure the vibration value generated by the fan when it is running. In addition, the accelerometer is set on a rigid fixture, and the fan is clamped by the rigid fixture to measure the vibration value generated when the fan is running. However, the sticking or locking method of accelerometers will cause the need to remove the glue and limit the measured object with holes suitable for locking or increase the quality of the measurement path, resulting in mass effect measurement errors. In addition to rigid fixtures The impact of the aforementioned mass effect will not cause errors in the measurement value due to the change of the surface shape of the object under test and the position of the clamping contact point, which is what the inventor of this case and related manufacturers engaged in this industry want to study and improve. Where the direction lies.

In order to improve the above-mentioned problems, one object of the present invention is to provide a spring top post and the fan of a fan detection jig that clamps and suspends a fan so that the fan is in a suspended position and measures the vibration signal of the fan during operation. Detection fixture. One object of the present invention is to provide a spring top column of a fan detection jig for a soft pad with suitable hardness and local contact with the object to be tested, which can reduce the error of the measurement value due to the influence of the position change of the clamping contact point of the jig. And the fan detection jig. Another object of the present invention is to provide a fan detection jig with a fixed side base provided with a plurality of positioning parts arranged at intervals from near to far with respect to a movable side base, so as to adjust the fixed side base and the movable side A separation distance between bases. Another object of the present invention is to provide a fan detection jig with a movable side base connected to a displacement module to retreat relative to a fixed side base, and the fixed side base and the movable side base can be moved by the displacement module A single fan or series fans of different thicknesses are clamped between them. In order to achieve the above-mentioned purpose, the present invention provides a spring top post of a fan detection fixture, which is used to clamp and suspend a fan with a plurality of mounting holes. The spring top post includes: a front housing with a first front end and A first rear end and a chamber, the first front end is covered with a soft pad surface contacting a fan frame of the fan, and a needle penetrates the soft pad and protrudes from the first front end to match the fan installation hole, the chamber Located between the first front end and the first rear end to accommodate a vibration sensor; a rear shell, arranged at intervals behind the front shell, has a second front end and a second rear end, the first Two front ends face the first rear end, and the second rear end is used to connect a jig set of a detection jig; an elastic element is connected between the front casing and the rear casing, and has a first A connection end is connected to the first rear end of the front case, and a second connection end is connected to the second front end of the rear case, and a hollow passage extends from the first connection end to the second connection end. The present invention provides a fan detection jig for testing a fan with a plurality of installation holes, the detection jig includes: a jig set, with a plurality of spring top columns clamped on both sides of the fan, each spring top The column includes: a front housing with a first front end, a first rear end and a chamber, the first front end covers a soft cushion surface contacting a fan frame of the fan, and a needle penetrates the soft cushion from the The first front end protrudes to fit the fan installation hole, and the chamber is located between the first front end and the first rear end; a rear shell is arranged at intervals behind the front shell, and has a second front end and a first first rear end. Two rear ends, the second front end faces the first rear end, the second rear end is connected to the jig set; an elastic element is located between the front casing and the rear casing, and has two connections The first rear end of the front housing and the second front end of the rear housing are respectively connected to each other, and a hollow channel runs through the two connecting ends; wherein at least one spring top column on both sides of the fan accommodates a vibrating The sensor is used for measuring a vibration signal when the fan is running. The aforesaid jig set has a fixed side base and a movable side base to move forward or backward relative to the fixed side base, a suspended space is located between the fixed side base and the movable side base, and the springs The top column is respectively connected with the fixed side base and the movable side base to clamp and suspend the fan in the suspended space. A lifting bracket is provided below the above-mentioned suspended space for the fan to be placed. The lifting base is connected to a lifting drive module. The lifting drive module includes a lifting rod and a lifting drive source. One end of the lifting rod is connected to the lifting base. The other end is connected to the lifting drive source. The above-mentioned movable side base has a movable base connected with a telescopic drive module, the telescopic drive module has a telescopic rod group, a telescopic drive source and a connecting rod group, the connecting rod group has two long straight rods and a horizontal rod, The two long straight rods are arranged in parallel, one end of which is connected to the movable base, the other end is connected to the transverse rod, one end of the telescopic rod group is connected to the horizontal rod, and the other end is connected to the telescopic driving source. The aforementioned movable base has two shaft holes socketed with two parallel rods of the telescopic drive module, and the movable base is connected with a displacement module, the displacement module is located between the telescopic drive module and the movable base, and the displacement module The set has a fixed part located between the movable base and the transverse bar of the telescopic driving module, and at least one elastic unit is connected between the movable base and the fixed part. The above-mentioned fixed side base has a fixed base, and the fixed base is provided with a plurality of positioning parts arranged at intervals. The distance between each positioning part relative to the movable side base is different, so as to adjust the distance between the fixed side base and the movable side base. a distance between. The aforementioned front shell is provided with at least one perforation to communicate with the chamber, and at least one support member has a top end that penetrates through the perforation into the chamber to abut against the vibration sensor; the first rear end of the front shell is provided with a convex body a hollow channel protruding to one of the connection ends of the elastic element, a rear convex wall protrudes from an outer edge of the first rear end and is located at a periphery of the rear convex body, the first connection end of the elastic element is located at the rear convex between the body and the back convex wall. The second front end of the aforesaid rear housing is provided with a front protruding body at intervals corresponding to the rear protruding body of the front housing, and the protruding body protrudes to the hollow channel of the other connecting end of the elastic element, and a protruding wall extends from the An outer edge of the second front end protrudes and is located at a periphery of the front protrusion, and a second connection end of the elastic element is located between the front protrusion and the front protrusion wall. The back protrusion system of the front case is a cone with a tapered end, and the front protrusion system of the rear case is a hollow cylinder with a shaft hole corresponding to the tapered end of the back protrusion of the front case. Each of the aforementioned vibration sensors has a signal connector connected to a signal line.

The above-mentioned purpose of the present invention and its structural and functional characteristics will be described based on the preferred embodiments of the accompanying drawings. In the present invention, terms such as "installation", "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it may be a fixed connection or It is a detachable connection; it may be a mechanical connection; it may be a direct connection or an indirect connection through an intermediary. Those with ordinary knowledge in the technical field can understand the specific meanings of the above terms in the present invention according to specific situations. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, the meanings of "plurality" and "plurality" are two or more, unless otherwise specifically defined. Figures 1A-1D are schematic diagrams of disassembly and assembly of the spring top column provided with the vibration sensor of the present invention. As shown in the figure, a spring top column 10 is installed on the fan testing jig for clamping and suspending a fan to be tested. An elastic element 13 connected between the front shell 11 and the rear shell 12 . The front housing 11 has a first front end 111, a first rear end 112 and a chamber 113, the chamber 113 is located between the first front end 111 and the first rear end 112 for accommodating a vibration sensor The vibration sensor 15 is, for example, an accelerometer, and the vibration sensor 15 has a signal connector 151 connected to a signal line 16 . The front housing 11 is provided with at least one perforation 116 to communicate with the chamber 113, and at least one support member 17 such as a screw has a top end 171 threaded from the perforation 116 into the chamber 113 to abut against the vibration sensor 15. The vibration sensor 15 is fixed in the chamber 113 . The first front end 111 of the front housing 11 is covered with a soft pad 114 , and a needle 115 protrudes from the first front end 111 to penetrate the soft pad 114 . The needle 115 is correspondingly inserted into a fan mounting hole of a frame of the fan. Furthermore, the soft pad 114 is a soft rubber pad, and its material is, for example but not limited to, rubber, plastic, or silicone, so as to be in contact with the fan frame of the fan so as to clamp the fan more tightly. In this way, the vibration generated when the fan is in operation can be transmitted to the spring top column 10 via the soft pad 14 as much as possible without damage, and be measured by the vibration sensor 15 . In this embodiment, the surface of the soft pad 114 is shown as a plane, and in other embodiments, the surface of the soft pad 114 is formed with several concentric circles arranged in corrugations. The first rear end 112 of the front housing 11 is provided with a rear convex body 1121, such as a cone, with a tapered end 11211 protruding backward, and a rear convex wall 1122 protrudes from an outer edge of the first rear end 112. Out and located at a periphery of the convex body 1121 . The rear housing 12 is spaced behind the front housing 11 and has a second front end 121 and a second rear end 122, the second front end 121 faces the first rear end 112, and the second rear end 122 is used for A jig group connected with a testing jig. The second front end 121 is provided with a front convex body 1211 corresponding to the rear convex body 1121 of the front housing 11 at intervals, and the front convex body 1211 is a hollow cylinder with a shaft hole 12111 corresponding to the rear convex body of the front housing 11 1121 tapered end 11211. A front protrusion wall 1212 protrudes from an outer edge of the second front end 121 and is located at a periphery of the front protrusion body 1211 . The elastic element 13 is, for example, a spring, which has a first connection end 131 and a second connection end 132 , and a hollow passage 133 extends from the first connection end 131 to the second connection end 132 . The first connecting end 131 and the second connecting end 132 are respectively connected to the first rear end 112 of the front case 11 and the second front end 121 of the rear case 12 via connecting means. In detail, the first connecting end 131 is located between the rear convex body 1121 and the rear convex wall 1122 , so that the rear convex body 1121 protrudes into the hollow channel 133 of the first connecting end 131 of the elastic element 13 . The second connection end 132 is located between the front protrusion 1211 and the front protrusion wall 1212 , so that the front protrusion 1211 protrudes into the hollow channel 133 of the second connection end 132 of the elastic element 13 . The aforementioned connection means are, for example but not limited to, welding, screw connection or adhesive bonding. Please continue to refer to Figures 2A-2D, which are schematic diagrams of the fan testing jig of the present invention; Figure 3 is a schematic diagram of the fan testing jig of the present invention measuring fan vibration signals. As shown in the figure, with reference to Figures 1A-1D, the fan detection jig of the present invention includes a jig set 20 arranged on the same plane (such as a workbench, etc.), and the jig set 20 has a fixed side base 21 and a movable side base 22 move forward or backward relative to the fixed side base 21 , and a suspended space 23 is located between the fixed side base 21 and the movable side base 22 . A lifting bracket 25 is disposed below the suspended space 23 . The fixed-side base 21 and the movable-side base 22 are respectively provided with a plurality of spring top posts 10 . The fixed side base 21 has a fixed base 211 which is vertically arranged with the fixed side base 21. The fixed base 211 is provided with a plurality of positioning parts 2111 arranged at intervals. The distance of the part 2111 relative to the movable side base 22 is from near to far. A distance between the fixed-side base 21 and the movable-side base 22 can be adjusted by connecting any different positioning portion on the plane. The movable side base 22 has a movable base 221 connected to a telescopic drive module 24, the telescopic drive module 24 has a telescopic rod set 241, a telescopic drive source 242 and a connecting rod set 243, the connecting rod set 243 has Two long straight rods 2431 and a horizontal rod 2432, the two long straight rods 2431 are arranged in parallel and one end is connected to the movable base 221, the other end is connected to the horizontal rod 2432, and one end of the telescopic rod group 241 is connected to the horizontal rod 2432, The other end is connected to the telescopic drive source 242, and the telescopic rod set 241 is driven to expand and contract by the telescopic drive source 242. Moreover, the connecting rod set 243 is linked with the telescopic rod set 241 , so that the two long straight rods 2431 drive the movable side base 22 to move forward or backward toward the fixed side base 21 . The movable base 221 has two shaft holes 2211 socketed on the two long straight rods 2431 of the telescopic driving module 24 , and moves along with the two long straight rods 2431 . And the movable base 221 is connected to a displacement module 26, the displacement module 26 is located between the telescopic drive module 24 and the movable base 221, and the displacement module 26 has a fixed part 261 arranged on the plane and located Between the movable base 221 and the transverse rod 2432 of the telescopic drive module 24, at least one elastic unit 262, such as a spring, is connected between the movable base 221 and the fixed part 261, and two elastic units 262 ( That is, springs) are disposed between the movable base 221 and the fixed portion 261 in parallel. In addition, a guide groove and a track cooperating with each other are respectively provided on the bottom surface of the movable base 221 and the plane (such as a workbench), so that the movable base 221 advances or retreats along the track. When the movable side base 22 advances toward the fixed side base 21 to a preset position along with the two long straight rods 2431, the two shaft holes 2211 of the movable base 221 are slightly retreated along the two long straight rods 2431 At the same time, the elastic unit 262 becomes compressed, so that the movable side base 22 moves a short distance in the opposite direction to the fixed side base 21, and then the elastic unit 262 generates a Elastic strength. Through such operation, a single fan or series fans with different thicknesses can be sandwiched between the fixed side base 21 and the movable side base 22 . The lifting bracket 25 is connected to a lifting drive module 251, the lifting driving module 251 includes a lifting rod 2511 and a lifting driving source 2512, one end of the lifting rod 2511 is connected to the lifting bracket 25, and the other end is connected to the lifting drive Source 2512. In some implementations, the aforementioned retractable driving source 242 and the lifting driving source 2512 are, for example but not limited to, air motors, hydraulic motors, or electric drive motors. In detail, the fixed-side base 21 and the movable-side base 22 are respectively provided with four symmetrical spring top posts 10 . The spring jacks 10 are respectively fixed on the fixed side base 21 and the movable side base 22 by the second rear end 122 of the rear housing 12 . In this implementation, screws are used to lock the second rear ends 122 of the four spring top posts 10 with the fixed side base 21, and the second rear ends 122 of the other four spring top posts 10 are connected to the movable side. The bases 22 are locked together. In addition, a vibration sensor 15 is respectively accommodated in the chamber 113 of at least one spring top post 10 of the fixed side base 21 and the chamber 113 of at least one spring top post 10 of the movable side base 22 for A vibration signal is measured when a fan is running. Generally speaking, a fan 30 to be measured has a fan frame 31 defining an air inlet side 311 and an air outlet side 312 (as shown in FIG. 3 ), and four corners of the fan frame 31 are respectively provided with a fan installation hole. 32. During operation, the fan 30 is first placed on the lifting bracket 25, and the fan 30 such as a single fan or a series fan is lifted and moved to the suspended space 23 by the lifting bracket 25, and the movable side base 22 is moved toward The fixed side base 21 advances and uses the respective spring top posts 10 to correspond to the fan mounting holes 32 at the four corners of the fan frame 31 from the air inlet side and the air outlet side of the fan 30, and then clamps the fan frame 31. Once the fan 30 is clamped, the lifting bracket 25 immediately descends to its original position. In detail, the needles 115 of the first front end 111 of the front housing 11 of each spring jack 10 are correspondingly inserted into the fan mounting holes 32 at the four corners of the fan frame 31, and the soft pad 114 is in surface contact with the fan 30. The fan frame 31 , and then the fan 30 is suspended in the suspended space 23 by the spring top posts 10 . Then control the fan 30 in the suspended space 23 to run to the test revolution (for example, 10,000 revolutions), and then measure the speed of the fan 30 at the test revolution through the vibration sensor 15 arranged in the spring top column 10 at a short distance. The generated vibration signal (such as vibration acceleration signal) is used to obtain the fan vibration signal. Since the elastic element 13 of the spring top column 10 is arranged between the front housing 11 and the rear housing 12, in addition to blocking external interference (such as external vibration) from the fixed side base 21 and the movable side base 22 to the Vibration sensor 15, and make the fan 30 under test in a suspended state, can effectively obtain the fan vibration signal as pure as possible without extra interference. Please continue to refer to FIG. 3 , which is a schematic diagram of measuring fan vibration signals by the fan detection jig of the present invention. As shown in the figure, one end of the signal line 16 is connected to the signal connector 151 of the vibration sensor 15, and the other end is connected to a signal acquisition card 41, and a computer 42 obtains the vibration of the fan 30 through the signal acquisition card 41. value (such as vibration acceleration value). The present invention clamps and suspends a fan 30 by these spring top columns 10, makes the fan 30 in a suspended position and then measures the fan vibration signal during its operation; and shortens the distance between the vibration sensor 15 and the fan 30 to be tested The distance allows the vibration state of the fan 30 to be measured at close range, so as to obtain the vibration signal of the fan without additional interference. Furthermore, the soft pads 114 of the spring jacks 10 provide suitable hardness and local contact with the fan 30 to be tested, so as to reduce the error of the measurement value caused by the position change of the clamping contact point of the jig. The present invention has been described in detail above, but what is described above is only a preferred embodiment of the present invention, and should not limit the scope of the present invention. That is, all equivalent changes and modifications made according to the application scope of the present invention shall still fall within the scope of the patent of the present invention.

10: Spring top column 11: Front shell 111: The first front end 112: The first backend 1121: Kyphosis 11211: tapered end 1122: back convex wall 113: Containment room 114: soft cushion 115: Needle 116: perforation 12: Rear housing 121: second front end 1211: Protruding body 12111: shaft hole 1212: front convex wall 122: Second backend 13: elastic element 131: the first connection end 132: the second connection end 133: hollow channel 15: Vibration sensor 151: Signal connector 16: Signal line 17: Support 171: top 20: Jig set 21: Fixed side base 211: fixed base 2111: Positioning Department 22: Movable side base 221: Activity base 2211: shaft hole 23: Suspended space 24: Telescopic drive module 241:Telescopic Rod Set 242: telescopic drive source 243: connecting rod group 2431: long straight rod 2432: Horizontal bar 25: Lifting bracket 251: Lifting drive module 2511: Lifting Rod 2512: Lifting drive source 26: Displacement module 261: fixed part 262:Elastic unit 30: fan 31: fan frame 311: Inlet side 312: air outlet side 32: Fan mounting hole 41: Signal acquisition card 4: computer

Figures 1A-1D are schematic diagrams of the decomposition and assembly of the spring top column provided with the vibration sensor of the present invention; Figures 2A-2C are schematic diagrams of the fan detection jig of the present invention; Figure 2D is a partially enlarged schematic diagram of Figure 2C; Fig. 3 is a schematic diagram of measuring the fan vibration signal by the fan detection jig of the present invention.

10: Spring top column

11: Front shell

113: Containment room

114: soft cushion

115: Needle

12: Rear housing

13: elastic element

15: Vibration sensor

122: Second backend

20: Jig set

21: Fixed side base

211: fixed base

2111: Positioning Department

22: Movable side base

221: Activity base

2211: shaft hole

23: Suspended space

24: Telescopic drive module

241:Telescopic Rod Set

242: telescopic drive source

243: connecting rod group

2431: long straight rod

2432: Horizontal bar

25: Lifting bracket

251: Lifting drive module

2511: Lifting Rod

2512: Lifting drive source

26: Displacement module

261: fixed part

262:Elastic unit

Claims (15)

A spring jack of a fan detection jig is used to clamp and suspend at least one fan with multiple installation holes, the spring jack includes: A front housing, having a first front end, a first rear end and a chamber, the first front end covers a soft pad surface contacting a fan frame of the fan, and a needle penetrates the soft pad from the first front end protruding to fit the fan installation hole, the chamber is located between the first front end and the first rear end for accommodating a vibration sensor; A rear shell, arranged at intervals behind the front shell, has a second front end and a second rear end, the second front end faces the first rear end, and the second rear end is used to connect a jig set ; An elastic element is connected between the front case and the rear case, has a first connection end connected to the first rear end of the front case, and a second connection end connected to the second end of the rear case The front end and a hollow passage extend through from the first connection end to the second connection end. The spring jack of the fan detection fixture as described in claim 1, wherein the front housing is provided with at least one through hole communicating with the chamber, and at least one support member has a top end that penetrates through the through hole into the chamber to resist the vibration Inductor; the first rear end of the front housing is provided with a hollow passage protruding from the first connecting end of the elastic element, and a rear convex wall protrudes from an outer edge of the first rear end and is located at the rear A periphery of the convex body, the first connecting end of the elastic element is located between the convex body and the convex wall behind. The spring top column of the fan detection jig as described in claim 2, wherein the second front end of the rear case is provided with a front protrusion at intervals corresponding to the rear protrusion of the front case, and the front protrusion protrudes to the The hollow channel of the second connection end of the elastic element, a front convex wall protrudes from an outer edge of the second front end and is located at a periphery of the front convex body, the second connection end of the elastic element is located between the front convex body and the front convex body Between the protruding walls. The spring top column of the fan detection jig as described in claim 3, wherein the convex system of the front housing is a cone with a tapered end, and the convex system of the rear housing is a hollow cylinder with A shaft hole corresponds to the tapered end of the rear convex body of the front housing. The spring jack of the fan detection jig as described in Claim 1, wherein the vibration sensor has a signal connector connected to a signal line. A fan detection jig is used to detect at least one fan with a plurality of mounting holes, the detection jig includes: A jig set, with a plurality of spring top posts clamped on both sides of the fan, each spring top post includes: A front housing, having a first front end, a first rear end and a chamber, the first front end covers a soft pad surface contacting a fan frame of the fan, and a needle penetrates the soft pad from the first front end protruding to fit the fan installation hole, the chamber is located between the first front end and the first rear end; A rear case, arranged at intervals behind the front case, has a second front end and a second rear end, the second front end faces the first rear end of the front case, the second rear end is connected to the set; An elastic element is located between the front case and the rear case, and has first and second connecting ends respectively connected to the first rear end of the front case and the second front end of the rear case, a a hollow passage is between the first and second connection ends; and Wherein the chambers of at least one spring top post on both sides of the fan are respectively accommodated with a vibration sensor for measuring a vibration signal when the fan is in operation. The fan detection jig as described in claim 6, wherein the jig set has a fixed side base and a movable side base to move forward or backward relative to the fixed side base, and a floating space is located on the fixed side base and the movable side base, the second ends of the rear shells of the spring top columns are respectively connected to the fixed side base and the movable side base to clamp and suspend the fan in the suspended space. The fan detection jig as described in claim 7, wherein a lifting bracket is provided under the suspended space for the fan to be placed, and the lifting bracket is connected to a lifting driving module, and the lifting driving module includes a lifting rod and a lifting rod. As for the lifting driving source, one end of the lifting rod is connected to the lifting bracket, and the other end is connected to the lifting driving source. The fan detection jig as described in claim 7, wherein the movable side base has a movable base connected to a telescopic drive module, and the telescopic drive module has a telescopic rod set, a telescopic drive source and a connecting rod set, The connecting rod group has two long straight rods and a horizontal rod, the two long straight rods are arranged in parallel and one end is connected to the movable base, the other end is connected to the horizontal rod, one end of the telescopic rod group is connected to the horizontal rod, and the other end is connected to the horizontal rod. Connect the telescoping drive source. The fan detection jig as described in Claim 9, wherein the movable base has two shaft holes socketed on the two long straight rods of the telescopic drive module, and the movable base is connected to a displacement module, and the displacement module is located on the telescopic Between the drive module and the movable base, and the displacement module has a fixed part between the movable base and the transverse rod of the telescopic drive module, and at least one elastic unit is connected between the movable base and the fixed part . The fan detection jig as described in claim 7, wherein the fixed side base has a fixed base, and the fixed base is provided with a plurality of positioning parts arranged at intervals, and the distance between each positioning part and the movable side base is from close to to adjust a distance between the fixed side base and the movable side base. The fan detection jig as described in claim 6, wherein the front housing is provided with at least one through hole communicating with the chamber, and at least one support member has a top end that penetrates through the through hole into the chamber to abut against the vibration sensor; The first rear end of the front housing is provided with a hollow passage protruding from one of the connecting ends of the elastic element with a rear convex body, and a rear convex wall protrudes from an outer edge of the first rear end and is located at a periphery of the rear convex body , the first connecting end of the elastic element is located between the rear convex body and the rear convex wall. The fan detection jig as described in Claim 12, wherein the second front end of the rear case is provided with a front protrusion at intervals corresponding to the back protrusion of the front case, and the front protrusion protrudes into the elastic element In the hollow channel at the other connecting end, a protruding wall protrudes from an outer edge of the second front end and is located on a periphery of the protruding body, and the second connecting end of the elastic element is located between the protruding body and the protruding wall between. The fan detection jig as described in claim 13, wherein the convex system of the front housing is a cone with a tapered end, and the convex system of the rear housing is a hollow cylinder with a shaft hole corresponding to the The tapered end of the kyphosis. The fan detection jig as described in Claim 6, wherein each vibration sensor has a signal connector connected to a signal line.

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