CN213274814U - Holding power testing device - Google Patents

Abstract

The utility model discloses a holding power testing arrangement, including first fitting piece, second fitting piece and base, be equipped with the test portion on the first fitting piece, the test portion is used for with the cooperation of pegging graft of the test piece that awaits measuring, first fitting piece is used for placing on the base, the second fitting piece is used for driving the test piece that awaits measuring and shifts up, is equipped with the stop part on the base, stop part and base interval setting, and the stop part is used for preventing first fitting piece to shift up, for the removal space that can supply first fitting piece to reciprocate between stop part and the base. Above-mentioned retentivity testing arrangement can be pegged graft the test portion on waiting to test piece and the first fitting piece, when the second fitting piece drives waiting to test the piece and shifts up, if wait to test piece and test portion can break away from, wait to test the piece and be unqualified, if do not break away from, first fitting piece continues to shift up and is blockked by the barrier part, if wait to test piece and test portion can not break away from, wait to test the piece and also be unqualified, the installation of waiting to test the piece is more convenient, the judgement mode is simpler simultaneously, can prevent the erroneous judgement.

Description

Holding power testing device

Technical Field

The utility model relates to a test equipment technical field especially relates to a holding power testing arrangement.

Background

For electrical connector terminals, reliability is the most important indicator, and the retention force that the terminal has determines the reliability of the terminal. The terminal of new energy automobile or rail transit connector requires more harsher, consequently requires strict management and control in the production stage, can realize full inspection best, guarantees the reliability of terminal. However, the traditional test equipment has a complex test process, is not easy to install and test, and is easy to have misjudgment.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model discloses lie in overcoming prior art not enough, provide an easy to assemble, judge accurate holding power testing arrangement.

The technical scheme is as follows:

the utility model provides a holding power testing arrangement, includes first fitting piece, second fitting piece and base, be equipped with the test part on the first fitting piece, the test part is used for cooperating with the examination of awaiting measuring grafting, first fitting piece is used for placing on the base, the second fitting piece is used for driving the examination of awaiting measuring shifts up, be equipped with the stop part on the base, the stop part with the base interval sets up, the stop part is used for stopping the first fitting piece shifts up, the stop part with for supplying between the base the removal space that first fitting piece reciprocated.

The holding force testing device can insert the test piece to be tested with the testing part on the first fitting piece, when the second fitting piece drives the test piece to be tested to move upwards, the test piece to be tested can drive the testing part and the first fitting piece, because the first fitting piece has dead weight, the first fitting piece is driven to move upwards and leave the base to overcome the dead weight of the first fitting piece, at the moment, the dead weight of the first fitting piece is applied to the test piece to be tested, if the test piece to be tested is separated from the testing part, the holding force when the test piece to be tested is inserted with the testing part is insufficient, the test piece to be tested is easy to fall off, at the moment, the test piece to be tested is unqualified, if the test piece to be tested is not separated from the testing part, the first fitting piece can move upwards and leave the base, the first fitting piece can be blocked by the blocking part after moving for a certain distance, the stress of the test piece to be tested is increased, if the test piece to be, the test piece to be tested is matched with the test part too tightly, and the test piece to be tested is also an unqualified test piece at the moment, so that the holding force of the test piece to be tested can be tested through the holding force test device, whether the holding force of the test piece to be tested is too large or too small can be known by observing whether the test piece to be tested is separated from the test part under different conditions, and whether the test piece to be tested is an qualified test piece is further judged, the test piece to be tested is more convenient to install, the judgment mode is simpler, and misjudgment can be prevented.

In one embodiment, the first matching piece is provided with a first position and a second position which are sequentially arranged from bottom to top, when the first matching piece is positioned at the first position, the first matching piece is contacted with the base, and when the first matching piece is positioned at the second position, the first matching piece is separated from the base and is contacted with the blocking part.

In one embodiment, a stop portion is disposed on a side surface of the first mating member, the stop portion is spaced from the base, and the stop portion contacts the base when the first mating member is located at the first position, or the stop portion is located between the stop portion and the base, and the stop portion contacts the stop portion when the first mating member is located at the second position.

In one embodiment, the number of the blocking parts is two, a guide space is defined between the two blocking parts, and the first matching piece is arranged in the guide space.

In one embodiment, a through hole is formed in the first fitting piece, the testing part partially penetrates out of the through hole, and the minimum aperture of the through hole is smaller than the outer diameter of the piece to be tested.

In one embodiment, the second fitting part comprises a sheath and a first template, wherein a first yielding hole is formed in the first template, the aperture of the first yielding hole is larger than or equal to that of the through hole, the sheath is arranged at the first yielding hole, and the through hole is surrounded by the sheath.

In one embodiment, the first template is further provided with a second yielding hole, the second yielding hole is communicated with the first yielding hole to form a stepped hole structure, the aperture of the second yielding hole is larger than that of the first yielding hole, and the sheath is arranged at the joint of the first yielding hole and the second yielding hole.

In one embodiment, the sheath comprises a limiting part and a sleeve part, the limiting part is arranged at the joint of the first abdicating hole and the second abdicating hole, and the sleeve part extends into the first abdicating hole.

In one embodiment, the holding force testing apparatus further includes a driving member disposed on the base, and the driving member is configured to push the second mating member, so that the second mating member drives the to-be-tested member to move upward.

In one embodiment, the holding power testing apparatus further includes a second mold plate, the second mating member has at least two guide posts, the two guide posts penetrate through the base and are in sliding fit with the base, the two guide posts are respectively disposed on two sides of the first mating member, one ends of the guide posts, which are far away from the second mating member, are both connected to the second mold plate, and the driving member is configured to drive the second mold plate to move.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a retention force testing device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of the retention force testing apparatus according to the embodiment of the present invention.

Description of reference numerals:

100. the testing device comprises a first matching piece, a second matching piece, a third matching piece, a fourth matching piece, a testing part, a third matching piece, a fourth matching piece, a second matching piece, a third matching piece, a fourth matching piece, a third matching piece, a testing part, a second matching piece, a fourth matching piece, a.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As shown in fig. 1 and fig. 2, an embodiment discloses a holding power testing apparatus, which includes a first fitting member 100, a second fitting member 200 and a base 300, wherein a testing portion 110 is disposed on the first fitting member 100, the testing portion 110 is used for being in plug-in fit with a to-be-tested piece 10, the first fitting member 100 is used for being placed on the base 300, the second fitting member 200 is used for driving the to-be-tested piece 10 to move upwards, a blocking portion 310 is disposed on the base 300, the blocking portion 310 and the base 300 are disposed at intervals, the blocking portion 310 is used for preventing the first fitting member 100 from moving upwards, and a moving space for the first fitting member 100 to move upwards and downwards is disposed between the blocking portion 310 and the base 300.

The holding force testing device can insert the testing part 10 to be tested into the testing part 110 of the first fitting part 100, when the second fitting part 200 drives the testing part 10 to move upwards, the testing part 10 can drive the testing part 110 and the first fitting part 100, because the first fitting part 100 has the dead weight, the dead weight of the first fitting part 100 needs to be overcome when the first fitting part 100 is driven to move upwards and leave the base 300, at this time, the dead weight of the first fitting part 100 is applied to the testing part 10, if the testing part 10 is separated from the testing part 110, the holding force when the testing part 10 is inserted into the testing part 110 is not enough, the testing part 10 is easy to fall off, at this time, the testing part 10 is unqualified, if the testing part 10 is not separated from the testing part 110, the first fitting part 100 can move upwards and leave the base 300, the first fitting part 100 is blocked by the blocking part 310 after moving a certain distance, and the force applied to the testing part 10 is increased, if the piece to be tested 10 is not separated from the testing part 110, it indicates that the retention force of the insertion connection between the piece to be tested 10 and the testing part 110 is too large, the piece to be tested 10 is too tightly matched with the testing part 110, and the piece to be tested 10 is also an unqualified piece at this time, so that the retention force of the piece to be tested 10 can be tested by the retention force testing device, and whether the piece to be tested 10 is separated from the testing part 110 under different conditions can be observed, so that whether the retention force of the piece to be tested 10 is too large or too small can be known, and further whether the piece to be tested 10 is a qualified piece can be judged, the piece to be tested 10 is more conveniently installed, meanwhile, the judgment mode is simpler, and misjudgment can be prevented.

Alternatively, the testing part 110 and the test piece 10 may be terminals and plugs matched in an electrical connector. Wherein the piece under test 10 may be a terminal or a plug. When the to-be-tested piece 10 is a plug, an auxiliary piece can be arranged outside the to-be-tested piece 10 and used for placing the plug to pass through the through hole, and the auxiliary piece is detachably connected with the plug.

In other embodiments, the test portion 110 and the test piece 10 may be connected by plugging, and the plugging firmness may be tested by the retention force testing device.

Optionally, the testing portion 110 is detachably connected to the first fitting member 100, and the testing portion 110 can be replaced to test different test pieces 10. Specifically, the holding power testing device further comprises a fixing member, wherein an assembling cylinder is arranged on the first fitting member 100, a fixing hole is formed in the side surface of the assembling cylinder, and the testing part 110 can be inserted into the assembling cylinder and penetrate through the fixing hole and the testing part 110 by using the fixing member, so that the testing member is fixed on the first fitting member 100 and is convenient to detach.

Optionally, the product of the mass of the first mating member 100 and the acceleration of gravity is greater than or equal to the minimum acceptable retention force of the test piece 10, if the test piece 10 to be tested does not separate from the testing portion 110 during the testing process, it indicates that the retention force of the test piece 10 to be tested is greater than or equal to the gravity of the first mating member 100, and further indicates that the retention force of the test piece 10 to be tested is inevitably greater than or equal to the minimum acceptable retention force of the test piece 10, and at this time, the test piece 10 to be tested inevitably meets the product requirements and is a qualified piece.

In one embodiment, the first engaging element 100 has a first position and a second position sequentially arranged from bottom to top, when the first engaging element 100 is located at the first position, the first engaging element 100 is in contact with the base 300, and when the first engaging element 100 is located at the second position, the first engaging element 100 is separated from the base 300 and is in contact with the blocking portion 310. When the first fitting piece 100 moves up under the driving of the second fitting piece 200, the first fitting piece 100 can move from the first position to the second position, and at this time, the to-be-tested piece 10 does not depart from the testing part 110, which means that the retention force of the to-be-tested piece 10 meets the requirement, when the first fitting piece 100 moves to the second position, the first fitting piece 100 can be blocked by the blocking part 310, so that the plugging and matching of the to-be-tested piece 10 and the testing part 110 needs to bear the gravity of the first fitting piece 100, and also needs to bear the resistance of the blocking part 310, and if the to-be-tested piece 10 does not depart from the testing part 110, which means that the retention force of the to-be-tested piece 10 is too large, and is not easy to pull out again after plugging, and also does not meet the.

In addition, the first engaging element 100 needs to be further displaced upward by a certain distance before contacting the blocking portion 310, and whether the test piece 10 is a qualified piece can be further determined by checking whether the test piece 10 is separated from the testing portion 110 during the displacement.

In one embodiment, as shown in fig. 1, a stop portion 120 is disposed on a side surface of the first mating member 100, the blocking portion 310 is disposed at a distance from the base 300, when the first mating member 100 is located at the first position, the stop portion 120 contacts the base 300, or the stop portion 120 is located between the blocking portion 310 and the base 300, when the first mating member 100 is located at the second position, the stop portion 120 contacts the blocking portion 310. At this moment, the blocking portion 310 only needs to limit and abut against the stopping portion 120, so that the first fitting piece 100 cannot continue to move upwards, the blocking portion 310 does not need to limit the whole first fitting piece 100, and the blocking portion 310 can be arranged on the side edge of the first fitting piece 100, so that the space occupied by the third fitting piece and the first fitting piece 100 in the vertical direction can be reduced, the overall size can be reduced, and the operation of inserting the to-be-tested piece 10 and the testing portion 110 is facilitated.

In other embodiments, the blocking portion 310 can be disposed on a side of the first mating member 100 away from the base 300.

In one embodiment, as shown in fig. 1, there are two blocking portions 310, a guide space is defined between the two blocking portions 310, and the first mating member 100 is disposed in the guide space. At this moment, the two blocking parts 310 can limit the movement of the first matching piece 100, when the piece to be tested 10 is separated from the testing part 110, the first matching piece 100 can move along the guide space, the displacement in the horizontal direction can not occur, the alignment accuracy can be ensured when the next side is inserted, the testing accuracy is improved, the safety accident caused by the displacement of the first matching piece 100 can be prevented, and the safety performance is improved.

Optionally, as shown in fig. 1, a first side plate 320 and a second side plate are disposed on the base 300, two ends of the blocking portion 310 are respectively connected with the first side plate 320 and the second side plate, and the first side plate 320, the second side plate and the two blocking portions 310 can cooperate to enclose the above-mentioned guiding space, so as to improve the limiting effect on the first mating member 100. Specifically, the two side plates of the first side plate 320 and the second side plate are bent in the direction approaching to each other and connected to the blocking portion 310, so that the overall strength of the structure is improved.

Optionally, a buffer is disposed between the first fitting member 100 and the base 300, for preventing the first fitting member 100 from being in hard contact with the base 300 when falling, protecting the base 300, and reducing noise.

In one embodiment, the first fitting member 100 is provided with a through hole, the testing portion 110 partially penetrates through the through hole, and the minimum aperture of the through hole is smaller than the outer diameter of the test piece 10. At this time, the device under test 10 is only required to be inserted into the testing portion 110, and the device under test 10 is inserted into the through hole and contacts with the periphery of the through hole, which means that the device under test 10 and the testing portion 110 are assembled, and the operation is simple.

In other embodiments, the first fitting piece 100 may also use other structures to limit the inserted to-be-tested piece 10, for example, a cylindrical structure disposed around the to-be-tested piece 10 is disposed on the first fitting piece 100, a plurality of threaded holes are circumferentially disposed on the cylindrical structure at intervals, and through screw-thread engagement of bolts and the like with the threaded holes, the bolts are made to approach the to-be-tested piece 10 and clamp the to-be-tested piece 10, so as to fix the to-be-tested piece 10.

In one embodiment, as shown in fig. 1, the second fitting member 200 includes a sheath 210 and a first template 220, the first template 220 is provided with a first yielding hole, an aperture of the first yielding hole is greater than or equal to an aperture of the through hole, the sheath 210 is set at the first yielding hole, and the sheath 210 encloses the through hole. Even if the test parts 110 with different sizes are replaced in the structure, the first yielding hole in the second fitting piece 200 can still be used for the test part 110 to pass through, the limiting part 211 is erected at the first yielding hole, the retaining force of the to-be-tested parts 10 with different specifications can be tested only by replacing limiting parts with through holes with different hole diameters, and the replacement is simpler.

In other embodiments, the first recess hole may be a through hole, so that the through hole is in clearance fit with the testing portion 110, and the aperture of the through hole is smaller than that of the test piece 10, so as to perform the retention test.

In one embodiment, a second yielding hole is further formed in the first template 220, the second yielding hole is communicated with the first yielding hole to form a stepped hole structure, the aperture of the second yielding hole is larger than that of the first yielding hole, and the sheath 210 is placed at the joint of the first yielding hole and the second yielding hole.

In one embodiment, as shown in fig. 1, the sheath 210 includes a position-limiting portion 211 and a sleeve portion 212, the position-limiting portion 211 is disposed at a connection portion of the first and second yielding holes, and the sleeve portion 212 extends into the first yielding hole. At this time, the limiting portion 211 can be set up at the joint of the first yielding hole and the second yielding hole after being placed into the second yielding hole, the second yielding hole is used for limiting the limiting portion 211, the limiting portion 211 is prevented from moving, the through hole is aligned with the first yielding hole, the sleeve portion 212 can prevent the testing portion 110 from being in direct contact with the second limiting member, and the testing portion 110 is protected.

In one embodiment, as shown in fig. 1, the above-mentioned retention test apparatus further includes a driving member 400, the driving member 400 is disposed on the base 300, and the driving member 400 is used for pushing the second fitting member 200, so that the second fitting member 200 drives the test piece 10 to move up. Since the driving member 400 is disposed on the base 300, the driving member 400 drives the second engaging member 200 to drive the first engaging member 100, and when the first engaging member 100 contacts with the blocking portion 310, the blocking portion 310 is disposed on the base 300, so that the blocking portion 310 is not pushed by the first engaging member 100, and by checking whether the test piece 10 is separated from the testing portion 110, whether the retention force is too large when the test piece 10 is engaged with the testing portion 110 is determined, and the blocking portion 310 is prevented from moving to affect the determination.

Optionally, when the first engaging element 100 abuts against the stopping portion 310, the force applied to the device under test 10 is actually the pushing force of the driving element 400, so that the pushing force of the driving element 400 is set to be less than or equal to the maximum acceptable holding force of the device under test 10, if the device under test 10 is separated from the testing portion 110 after the first engaging element 100 abuts against the stopping portion 310 during the testing process, the holding force of the device under test 10 is less than or equal to the pushing force of the driving element 400, and thus the holding force of the device under test 10 is inevitably less than the maximum acceptable holding force of the device under test 10, and the device under test 10 is an acceptable device, otherwise, the device under test is an unacceptable device.

In one embodiment, as shown in fig. 1, the above retention test apparatus further includes a second mold plate 240, the second mating member 200 is provided with at least two guide posts 230, the guide posts 230 penetrate through the base 300 and are slidably engaged with the base 300, wherein the two guide posts 230 are respectively disposed on two sides of the first mating member 100, one end of the guide post 230 away from the second mating member 200 is connected to the second mold plate 240, and the driving member 400 is used for driving the second mold plate 240 to move. The guide post 230 can guide the movement of the second fitting piece 200, so as to prevent the second fitting piece 200 from being displaced to incline, improve the accuracy of the test, drive the second template 240 through the driving piece 400 to drive different guide posts 230 to move synchronously, prevent the first template 220 from inclining to influence the contact posture of the test piece 10 to be tested and the first template 220, and further influence the test of the holding power of the test piece 10 to be tested.

Optionally, as shown in fig. 1, the base 300 includes a third mold plate 330 and a fourth mold plate 340 connected to each other, the third mold plate 330 is located above the fourth mold plate 340, the first mating member 100 is configured to be placed on the third mold plate 330, the guide post 230 penetrates through the third mold plate 330, the driving member 400 is disposed on the fourth mold plate 340, and the driving member 400 is configured to drive the guide post 230 to move. When the first engaging member 100 moves upward and contacts the blocking portion 310, the blocking portion 310 is connected to the base 300, and the driving member 400 is disposed on the fourth mold plate 340, so that the first engaging member 100 cannot push the blocking portion 310 to move, and the blocking portion 310 is prevented from moving and failing to perform the test. For example, when the driving member 400 is disposed at another location, the driving member 400 pushes the second fitting element 200 to move upward, the second fitting element 200 drives the first fitting element 100 to move upward by the insertion of the to-be-tested piece 10 and the testing part 110, when the first fitting element 100 moves upward to the blocking part 310, if the weight of the base 300 is light, the blocking part 310 will drive the base 300 to be pushed up by the first fitting element 100, so that it cannot be determined whether the maximum holding force of the to-be-tested piece 10 is greater than or equal to the maximum acceptable holding force, and the testing result will be affected.

Specifically, the second template 240 is disposed between the third template 330 and the fourth template 340. The driving member 400 is arranged reasonably, occupies small space and is convenient to move and operate.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. The utility model provides a holding power testing arrangement, its characterized in that includes first fitting piece, second fitting piece and base, be equipped with the test part on the first fitting piece, the test part is used for with the cooperation of pegging graft of the test piece that awaits measuring, first fitting piece is used for placing on the base, the second fitting piece is used for driving the test piece that awaits measuring shifts up, be equipped with the barrier part on the base, the barrier part with the base interval sets up, the barrier part is used for stopping the first fitting piece shifts up, the barrier part with for supplying between the base the removal space that first fitting piece reciprocated.

2. The retention test apparatus of claim 1, wherein the first engaging member has a first position and a second position sequentially arranged from bottom to top, and the first engaging member contacts the base when the first engaging member is located at the first position, and the first engaging member is separated from the base and contacts the blocking portion when the first engaging member is located at the second position.

3. The device for testing the retention according to claim 2, wherein a stop portion is provided on a side surface of the first mating member, the stop portion is spaced from the base, and the stop portion is in contact with the base when the first mating member is located at the first position, or the stop portion is located between the stop portion and the base, and the stop portion is in contact with the stop portion when the first mating member is located at the second position.

4. The retention test apparatus of claim 3, wherein the number of the blocking portions is two, a guide space is defined between the two blocking portions, and the first engaging member is disposed in the guide space.

5. The holding power test device of claim 1, wherein the first fitting member is provided with a through hole, the test portion partially penetrates through the through hole, and the minimum aperture of the through hole is smaller than the outer diameter of the test piece.

6. The holding power testing device of claim 5, wherein the second fitting member comprises a sheath and a first template, the first template is provided with a first yielding hole, the aperture of the first yielding hole is larger than or equal to that of the through hole, the sheath is arranged at the first yielding hole, and the sheath encloses the through hole.

7. The holding power testing device of claim 6, wherein the first template is further provided with a second yielding hole, the second yielding hole is communicated with the first yielding hole to form a stepped hole structure, the diameter of the second yielding hole is larger than that of the first yielding hole, and the sheath is placed at the joint of the first yielding hole and the second yielding hole.

8. The retention test device of claim 7, wherein the sheath includes a limiting portion and a sleeve portion, the limiting portion is disposed at a connection point of the first and second yielding holes, and the sleeve portion extends into the first yielding hole.

9. The device for testing retention according to any of claims 1-8, further comprising a driving member disposed on the base, wherein the driving member is configured to push the second mating member, so that the second mating member moves the device to be tested upward.

10. The device for testing holding power of claim 9, further comprising a second mold plate, wherein the second mating member has at least two guide posts, the at least two guide posts are inserted through the base and slidably engaged with the base, the two guide posts are respectively disposed on two sides of the first mating member, one end of each guide post away from the second mating member is connected to the second mold plate, and the driving member is configured to drive the second mold plate to move.

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