Anti-pulling experiment testing device and method for concrete pile clamping connection mechanism

Abstract

The invention discloses an anti-pulling experiment testing device and method for a concrete pile clamping connection mechanism, and belongs to the field of anti-pulling experiment testing of clamping connection mechanisms. An anti-pulling experiment testing device of a concrete pile clamping connection mechanism comprises a jack fixedly connected to the top of a load plate, a counter-force beam fixedly connected to the output end of the jack, and a connection frame slidably connected to the top of the counter-force beam, and further comprises a mounting base fixed to the top of the load plate, the clamping connection mechanism is mounted and limited; the expansion mechanism is fixed to the bottom of the connecting frame and used for being adjusted according to the position of the clamping connecting mechanism; according to the anti-pulling testing device, synchronous anti-pulling testing can be carried out when the clamping connection mechanism plug pin is subjected to anti-pulling, the problem that the anti-pulling testing efficiency of the single clamping connection mechanism plug pin position is low is solved, meanwhile, the plug pin upward anti-pulling testing is firmer and firmer, and the working efficiency of the anti-pulling testing device is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of pull-out test of a clamping connection mechanism, and in particular to a pull-out test device of a concrete pile clamping connection mechanism. Background Art

[0002] In modern buildings and large-scale projects, prestressed concrete pipe piles are widely used in engineering projects due to their high pull-out bearing capacity and good economy. However, the pull-out performance of the pipe piles is often affected by welding and other problems during the construction process. When the concrete pipe piles are driven into the soil at a depth of 30 meters, since the concrete pipe piles can only be made into a length of 10 meters, multiple concrete pipe piles need to be connected. At this time, a snap-on connection mechanism is required to connect the multiple layers of concrete to each other. Since the snap-on connection mechanism is generally a plug-in connection mechanism, the plug-in mechanism is generally composed of a pin and a spring for use. When there are twelve pins in use on a plane, when the twelve pins are not on the same plane, it is easy to cause some of the pins to be used, and some of the pins will be used in turn, affecting the problem of low pull-out resistance when the concrete connection is made. Therefore, it is necessary to conduct experimental tests on the pull-out resistance of the snap-on connection mechanism.

[0003] During the pull-out test experiment of the existing plug-in connection mechanism pins, since the plug-in connection mechanism pins are arranged in multiple groups, a single pull-out test is required when performing the pull-out test on the snap-in connection mechanism pins, resulting in low efficiency of the pull-out test of a single snap-in connection mechanism pin position, further reducing the working efficiency of the pull-out test device. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a pull-out test device for a concrete pile clamping connection mechanism.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A pull-out test device for a concrete pile clamping connection mechanism comprises a load plate, a jack is fixedly connected to the top of the load plate, a reaction beam is fixedly connected to the output end of the jack, a connection frame is slidably connected to the top of the reaction beam, and further comprises: a mounting base fixed to the top of the load plate for limiting the installation of the clamping connection mechanism; an expansion mechanism fixed to the bottom of the connection frame for adjusting according to the position of the clamping connection mechanism; and an anti-drop mechanism fixed to the bottom of the expansion mechanism for clamping the end of the clamping connection mechanism.

[0006] Preferably, the expansion mechanism includes a fixed shell fixed to the bottom of the connecting frame, the inner wall of the fixed shell is slidably connected to an extension rod, the top of one end of the extension rod is fixedly connected to a positioning rod, the top of the fixed shell is rotatably connected to a rotating assembly through a bearing, and the bottom of the other end of the extension rod is fixedly connected to a damper.

[0007] Preferably, the anti-falling mechanism includes a displacement seat fixed at the bottom of the damper, the interior of the displacement seat is slidably connected to a rotating rod via a fixed rod, the middle part of the rotating rod is rotatably connected to a sleeve tube via a rotating shaft, the end of the rotating rod passes through the sleeve tube and extends outside to be fixedly connected to a clamping plate, a bayonet groove is provided on the surface of the sleeve tube, and the rotating rod is connected to the inside of the bayonet groove.

[0008] Preferably, a pre-tightening mechanism is fixedly connected to the surface of the clamping plate; wherein the pre-tightening mechanism includes an extension shell fixed to the side wall of the clamping plate, the interior of the extension shell is threadedly connected to a connecting bolt, and the end of the connecting bolt is fixedly connected to an extrusion plate.

[0009] Preferably, a guide rod is fixedly connected to one side of the extrusion plate, and an end of the guide rod penetrates the inner wall of the expansion shell and extends to the outside.

[0010] Preferably, the rotating assembly comprises a rotating disk that rotates inside the fixed housing via a bearing, a plurality of arc-shaped grooves are formed on the surface of the rotating disk, and the positioning rod slides on the inner wall of the arc-shaped groove.

[0011] Preferably, the turning handle is located at the center of several arc-shaped slots, and the turning handle is located at the center of several arc-shaped slots.

[0012] Preferably, a displacement sensor is connected to the bottom of the expansion mechanism, a signal receiver is fixedly connected to the surface of the anti-falling mechanism, and the signal receiver is electrically connected to the displacement sensor.

[0013] Preferably, a guide groove is provided on the surface of the rotating rod, and the guide groove slides on the surface of the fixed rod arranged on the inner wall of the displacement seat.

[0014] A method for using a pull-out test device for a concrete pile clamping connection mechanism mainly comprises the following steps: S1. First, place the load plate flat, and then move the reaction beam to a suitable position by using a jack. Then, move the connection frame on the reaction beam surface to the middle, and then limit and fix the card connection mechanism by installing the base, and then drive it by the expansion mechanism to control the anti-drop mechanism to adjust the spacing, so that it can be docked according to the position of the card connection mechanism pin, and then fix the card connection mechanism by the anti-drop mechanism; S2. When the pull-out test is performed on the latch of the card-connecting mechanism, the jack is moved upward, which can synchronously drive the reaction beam and the connecting frame to move upward, and then the anti-dropping mechanism at the bottom of the expansion mechanism is moved upward. Since the anti-dropping mechanism is fixed to the latch of the card-connecting mechanism, the latch of the card-connecting mechanism can be synchronously tested for upward pull-out; S3. When performing a synchronous upward pull-out test on multiple latches of the card-jointed connection mechanism, the displacement sensor can receive the distance value on the anti-dropping mechanism by signal. When all the values ​​on the anti-dropping mechanism are consistent, it is judged that the displacements of the multiple latches of the card-jointed connection mechanism are on the same horizontal plane and force is applied simultaneously. On the contrary, when one or more of the values ​​are inconsistent, it is judged that the displacements of one or more latches of the card-jointed connection mechanism are not on the same horizontal plane and force is applied sequentially. Compared with the prior art, the present invention provides a pull-out test device for a concrete pile clamping connection mechanism, which has the following beneficial effects: 1. The pull-out test device of the concrete pile clamping connection mechanism can be adjusted according to the position of the clamping connection mechanism pin through the cooperation between the fixed shell, the extension rod, the positioning rod and the rotating assembly. Through this arrangement, it is possible to perform a pull-out test on the clamping connection mechanism pin synchronously when the pull-out test is performed on the clamping connection mechanism pin, thereby preventing the problem of low pull-out test efficiency at a single clamping connection mechanism pin position, and further improving the working efficiency of the pull-out test device.

[0015] 2. The pull-out test device for the concrete pile clamping connection mechanism can clamp the surface of the pin of the clamping connection mechanism through the cooperation between the displacement seat, the rotating rod, the sleeve tube, the clamping plate and the bayonet groove. Through this setting, the upward pull-out test of the pin is made more and more firm, which prevents the pin from falling off due to insufficient clamping force during the pull-out test, and further improves the pull-out safety of the clamping connection mechanism during the test.

[0016] 3. The pull-out test device of the concrete pile clamping connection mechanism can pre-tighten the clamping connection mechanism pin in advance through the cooperation between the expansion shell, the connecting bolt and the extrusion plate to prevent displacement problems when the clamping connection mechanism pin is clamped, so that the two clamping plates can be quickly positioned and clamped.

[0017] The parts not involved in the device are the same as the prior art or can be implemented by using the prior art. The present invention can perform a simultaneous pull-out test on the latch of the snap-in connection mechanism, thereby preventing the problem of low efficiency of the pull-out test at a single latch-in connection mechanism latch position. At the same time, the pull-out test becomes increasingly firm upward on the latch, further improving the working efficiency of the pull-out test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural schematic diagram of a pull-out test device for a concrete pile clamping connection mechanism proposed by the present invention; Figure 2 This is a front structural schematic diagram of a pull-out test device for a concrete pile clamping connection mechanism proposed by the present invention; Figure 3 A schematic diagram of the structure of an expansion mechanism of a pull-out test device for a concrete pile clamping connection mechanism proposed by the present invention; Figure 4 Schematic diagram of the anti-falling mechanism structure of the pull-out test device of the concrete pile clamping connection mechanism proposed by the present invention Figure 1 ; Figure 5 Schematic diagram of the anti-falling mechanism structure of the pull-out test device of the concrete pile clamping connection mechanism proposed by the present invention Figure 2 ; Figure 6 A schematic diagram of the structure of a pre-tightening mechanism of a pull-out test device for a concrete pile clamping connection mechanism proposed by the present invention; Figure 7 A schematic diagram of the structure of a displacement sensor and a signal receiver of a pull-out test device for a concrete pile clamping connection mechanism proposed by the present invention; Figure 8 The present invention provides a schematic diagram of the structure of a signal receiver for a pull-out test device for a concrete pile clamping connection mechanism.

[0019] In the figure: 1. load plate; 2. jack; 3. reaction beam; 4. connecting frame; 5. mounting base; 6. expansion mechanism; 61. fixed shell; 62. extension rod; 63. positioning rod; 64. rotating assembly; 641. rotating disk; 642. arc groove; 643. turning handle; 65. damper; 7. anti-falling mechanism; 71. displacement seat; 72. rotating rod; 73. socket tube; 74. clamping plate; 75. bayonet groove; 76. guide groove; 8. pre-tightening mechanism; 81. expansion shell; 82. connecting bolt; 83. extrusion plate; 84. guide rod; 9. displacement sensor; 10. signal receiver. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In one embodiment, referring to Figure 1-Figure 8A pull-out test device for a concrete pile clamping connection mechanism comprises a load plate 1, a jack 2 is fixedly connected to the top of the load plate 1, a reaction beam 3 is fixedly connected to the output end of the jack 2, and a connection frame 4 is slidably connected to the top of the reaction beam 3. The device also comprises: a mounting base 5, fixed to the top of the load plate 1, for limiting the installation of the clamping connection mechanism; an expansion mechanism 6, fixed to the bottom of the connection frame 4, for adjusting the position of the clamping connection mechanism; an anti-falling mechanism 7, fixed to the bottom of the expansion mechanism 6, for clamping the end of the clamping connection mechanism, a displacement sensor 9 is connected to the bottom of the expansion mechanism 6, a signal receiver 10 is fixedly connected to the surface of the anti-falling mechanism 7, and the signal receiver 10 is electrically connected to the displacement sensor 9.

[0023] By adopting such a scheme, the snap-in connection mechanism can be placed under the through groove setting opened in the middle of the mounting base 5, and then the bottom of the snap-in connection mechanism can be fixed by the limiting mechanism, thereby ensuring that the snap-in connection mechanism is firmly installed on the mounting base 5, thereby ensuring the stability of the snap-in connection mechanism in the later pull-out resistance test.

[0024] During specific work, when in use, the card-joining mechanism can be placed and installed by setting the base 5 on the top of the load plate 1, and then driven downward by the jack 2, the reaction beam 3, the connecting frame 4 and the expansion mechanism 6 and the anti-falling mechanism 7 are driven to move downward synchronously in turn, so that the anti-falling mechanism 7 can be sleeved on the surface of the card-joining mechanism pin, and then driven upward by the jack 2, the anti-falling mechanism 7 is fixed to the card-joining mechanism pin for anti-pull-out test. When multiple card-joining mechanism pins are subjected to synchronous upward anti-pull-out test, the distance value on the anti-falling mechanism 7 can be received by the displacement sensor 9. When all the values ​​on the anti-falling mechanism 7 are consistent, it is judged that multiple card-joining mechanism pins are on the same horizontal plane and force is applied simultaneously. On the contrary, when one or more of the values ​​are inconsistent, it is judged that one or more card-joining mechanism pins are not on the same horizontal plane and force is applied in sequence, so as to judge whether the card-joining mechanism is qualified.

[0025] In addition, the displacement sensor 9 can be electrically connected to the display screen, so as to more accurately find out whether the values ​​of the latches of the card connection mechanism in different directions are abnormal. In one embodiment, referring to Figure 3A pull-out test device for a concrete pile clamping connection mechanism comprises a load plate 1, a jack 2 is fixedly connected to the top of the load plate 1, a reaction beam 3 is fixedly connected to the output end of the jack 2, and a connection frame 4 is slidably connected to the top of the reaction beam 3. The device also comprises: a mounting base 5, fixed to the top of the load plate 1, for limiting the installation of the clamping connection mechanism; an expansion mechanism 6, fixed to the bottom of the connection frame 4, for adjusting the position of the clamping connection mechanism; an anti-falling mechanism 7, fixed to the bottom of the expansion mechanism 6, for clamping the end of the clamping connection mechanism, and the expansion mechanism 6 comprises a fixed shell fixed to the bottom of the connection frame 4. The body 61, the inner wall of the fixed shell 61 is slidably connected with an extension rod 62, the top of one end of the extension rod 62 is fixedly connected with a positioning rod 63, the top of the fixed shell 61 is rotatably connected with a rotating assembly 64 through a bearing, the other end of the extension rod 62 is fixedly connected with a damper 65 at the bottom, the rotating assembly 64 includes a rotating disk 641 that rotates inside the fixed shell 61 through a bearing, a plurality of arc grooves 642 are opened on the surface of the rotating disk 641, the positioning rod 63 slides on the inner wall of the arc groove 642, the turning handle 643 is located at the center position of the plurality of arc grooves 642, and the turning handle 643 is located at the center position of the plurality of arc grooves 642.

[0026] By adopting such a scheme, under the drive of the expansion mechanism 6, the position of the latch pin of the snap-in connection mechanism is adjusted, so that the anti-fall-off mechanism 7 can be controlled to be accurately aligned above the latch pin of the snap-in connection mechanism to prevent the anti-pull-out test from being unable to be sleeved on the latch pin of the snap-in connection mechanism due to distance error.

[0027] During specific operation, when in use, the rotating assembly 64 on the fixed shell 61 is driven to make the positioning rod 63 fixed on the extension rod 62 slide inside the rotating assembly 64, and the extension rod 62 can be driven to move by the positioning rod 63, and then the damper 65 can be driven to move by the extension rod 62, thereby synchronously driving multiple anti-falling mechanisms 7 to move synchronously, so that multiple anti-falling mechanisms 7 can be accurately adjusted just above the pin of the card connection mechanism, so as to facilitate the later clamping and pull-out resistance test, and the rotating disk 641 is rotated to drive the arc groove 642 to change its angle. Since the positioning rod 63 slides inside the arc groove 642, the positioning rod 63 can be adjusted to drive the extension rod 62 to slide on the inner wall of the fixed shell 61, and then the setting of the turning handle 643 is convenient for the staff to manually control and adjust.

[0028] In one embodiment, referring to Figure 4 and Figure 5The anti-falling mechanism 7 includes a displacement seat 71 fixed at the bottom of the damper 65. The interior of the displacement seat 71 is slidably connected to a rotating rod 72 through a fixed rod. The middle part of the rotating rod 72 is rotatably connected to a sleeve tube 73 through a rotating shaft. The end of the rotating rod 72 passes through the sleeve tube 73 and is fixedly connected to a clamping plate 74 extending outside. A bayonet groove 75 is provided on the surface of the sleeve tube 73. The interior of the bayonet groove 75 passes through the rotating rod 72. A guide groove 76 is provided on the surface of the rotating rod 72. The guide groove 76 slides on the surface of the fixed rod set on the inner wall of the displacement seat 71.

[0029] With such a scheme, under the setting of the anti-falling mechanism 7, when the jack 2 moves downward, it can be sleeved on the surface of the pin of the card-connecting mechanism, and then when the anti-falling mechanism 7 is driven by the jack 2 to move upward, the surface of the pin of the card-connecting mechanism can be clamped for pull-out resistance test, and when the anti-falling mechanism 7 continues to move upward, it can be clamped more firmly to the surface of the pin of the card-connecting mechanism to prevent the problem of falling off due to insufficient clamping force.

[0030] When the locking cam 75 is in the unlocked position, the locking cam 73 is in the unlocked position, and the locking cam 73 is locked. When the expansion mechanism 6 moves upward, it can synchronously drive the displacement seat 71 to move upward. When the displacement seat 71 moves upward, the guide groove 76 opened on the rotating rod 72 can slide on the fixed rod in the displacement seat 71, so as to change the angle ratio of the rotating rod 72 again. Because when the rotating rod 72 moves upward, the end of the rotating rod 72 will move inward, so that it can be clamped on the surface of the latch of the card connection mechanism sleeved on the sleeve tube 73. As the displacement seat 71 continues to move upward, it can be clamped more firmly on the surface of the latch of the card connection mechanism. When clamping the latch of the card connection mechanism, the surface can be straightened at the same time to ensure that the latch of the card connection mechanism is more stable and reliable when used later. When the clamping force is at the maximum value, the latch of the card connection mechanism will be moved upward for the anti-pullout test.

[0031] In addition, the surface of the clamping plate 74 is provided with anti-skid grooves, so as to improve the anti-skid performance when clamping the latch of the snap connection mechanism.

[0032] In one embodiment, reference Figure 6 A pre-tightening mechanism 8 is fixedly connected to the surface of the clamping plate 74; wherein the pre-tightening mechanism 8 includes an extension shell 81 fixed to the side wall of the clamping plate 74, the interior of the extension shell 81 is connected with a connecting bolt 82 through a thread, the end of the connecting bolt 82 is fixedly connected to an extrusion plate 83, one side of the extrusion plate 83 is fixedly connected to a guide rod 84, and the end of the guide rod 84 penetrates the inner wall of the extension shell 81 and extends to the outside.

[0033] By adopting such a solution, under the setting of the side wall pre-tightening mechanism 8 of the clamping plate 74, the latch pin of the card connection mechanism can be pre-tightened during the sleeve connection process, so as to ensure the stability of the anti-drop mechanism 7 during the subsequent connection.

[0034] During specific operation, when the clamping plate 74 is sleeved on the surface of the latch pin of the card connection mechanism, the connecting bolt 82 of the side wall of the expansion shell 81 is rotated, so as to drive the extrusion plate 83 to move. When the extrusion plate 83 moves, the surface of the latch pin of the card connection mechanism can be clamped and fixed, and as the extrusion plate 83 continues to move, the surface of the latch pin of the card connection mechanism can be straightened to prevent the bending of the latch pin of the card connection mechanism from affecting the quality of clamping in the later stage. With the setting of the guide rod 84, it can play a guiding and limiting role when the extrusion plate 83 moves.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pull-out test device for a concrete pile clamping connection mechanism, comprising a load plate (1), a jack (2) fixedly connected to the top of the load plate (1), a reaction beam (3) fixedly connected to the output end of the jack (2), and a connection frame (4) slidably connected to the top of the reaction beam (3), characterized in that: Also includes: A mounting base (5) is fixed on the top of the load plate (1) and is used to limit the installation of the snap-fit ​​connection mechanism; An expansion mechanism (6) is fixed to the bottom of the connection frame (4) and is used to adjust the position according to the snap connection mechanism; The anti-falling mechanism (7) is fixed to the bottom of the expansion mechanism (6) and is used to clamp the end of the clamping connection mechanism.

2. The pull-out test device for a concrete pile clamping connection mechanism according to claim 1, characterized in that: The expansion mechanism (6) comprises a fixed shell (61) fixed to the bottom of the connecting frame (4); an extension rod (62) is slidably connected to the inner wall of the fixed shell (61); a positioning rod (63) is fixedly connected to the top of one end of the extension rod (62); a rotating assembly (64) is rotatably connected to the top of the fixed shell (61) via a bearing; and a damper (65) is fixedly connected to the bottom of the other end of the extension rod (62).

3. The pull-out test device for a concrete pile clamping connection mechanism according to claim 1, characterized in that: The anti-falling mechanism (7) comprises a displacement seat (71) fixed to the bottom of the damper (65); a rotating rod (72) is slidably connected to the interior of the displacement seat (71) via a fixed rod; a sleeve tube (73) is rotatably connected to the middle of the rotating rod (72) via a rotating shaft; an end of the rotating rod (72) penetrates into the sleeve tube (73) and extends outside to be fixedly connected to a clamping plate (74); a bayonet groove (75) is provided on the surface of the sleeve tube (73); and the bayonet groove (75) penetrates and is connected to the rotating rod (72).

4. The pull-out test device for a concrete pile clamping connection mechanism according to claim 3, characterized in that: A pre-tightening mechanism (8) is fixedly connected to the surface of the clamping plate (74); The pre-tightening mechanism (8) comprises an expansion shell (81) fixed to the side wall of the clamping plate (74), the interior of the expansion shell (81) is connected to a connecting bolt (82) via a thread, and the end of the connecting bolt (82) is fixedly connected to an extrusion plate (83).

5. The pull-out test device for a concrete pile clamping connection mechanism according to claim 4, characterized in that: A guide rod (84) is fixedly connected to one side of the extrusion plate (83), and an end of the guide rod (84) penetrates the inner wall of the expansion shell (81) and extends to the outside.

6. The pull-out test device for a concrete pile clamping connection mechanism according to claim 2, characterized in that: The rotating assembly (64) comprises a rotating disk (641) that rotates inside a fixed housing (61) via a bearing, a plurality of arc-shaped grooves (642) are formed on the surface of the rotating disk (641), and the positioning rod (63) slides on the inner wall of the arc-shaped groove (642).

7. The pull-out test device for a concrete pile clamping connection mechanism according to claim 6, characterized in that: The turning handle (643) is located at the center of the plurality of arc-shaped grooves (642).

8. The pull-out test device for a concrete pile clamping connection mechanism according to claim 1, characterized in that: The bottom of the expansion mechanism (6) is connected to a displacement sensor (9), the surface of the anti-falling mechanism (7) is fixedly connected to a signal receiver (10), and the signal receiver (10) is electrically connected to the displacement sensor (9).

9. The pull-out test device for a concrete pile clamping connection mechanism according to claim 3, characterized in that: A guide groove (76) is provided on the surface of the rotating rod (72), and the guide groove (76) slides on the surface of a fixed rod provided on the inner wall of the displacement seat (71).

10. A method for testing a pull-out test device for a concrete pile clamping connection mechanism, comprising the pull-out test device for a concrete pile clamping connection mechanism according to claim 8, characterized in that: The main steps include: S1. First, the load plate (1) is placed flat, and then the reaction beam (3) is moved to a suitable position by the jack (2). Then, the connection frame (4) on the surface of the reaction beam (3) is moved to the middle, and then the clamping connection mechanism is fixed by the mounting base (5). Then, the expansion mechanism (6) is driven to control the anti-dropping mechanism (7) to adjust the spacing, so that the clamping connection mechanism can be docked according to the position of the latch of the clamping connection mechanism, and then the clamping connection mechanism is fixed by the anti-dropping mechanism (7); S2. When performing a pull-out test on the latch of the card-joined connection mechanism, the jack (2) is moved upward, which can synchronously drive the reaction beam (3) and the connection frame (4) to move upward, and then the anti-fall-off mechanism (7) at the bottom of the expansion mechanism (6) is moved upward. Since the anti-fall-off mechanism (7) is fixed to the latch of the card-joined connection mechanism, the latch of the card-joined connection mechanism can be synchronously tested for upward pull-out; S3. When performing a synchronous upward pull-out test on the pins of the multiple card-jointed connection mechanisms, the displacement sensor (9) can receive the distance value on the anti-dropping mechanism (7) by signal. When all the values ​​on the anti-dropping mechanism (7) are consistent, it is determined that the multiple card-jointed connection mechanism pins are displaced on the same horizontal plane and force is applied simultaneously. On the contrary, when one or more of the values ​​are inconsistent, it is determined that the one or more card-jointed connection mechanism pins are not displaced on the same horizontal plane and force is applied sequentially.

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