A screw bending resistance testing device

Abstract

The present application relates to the field of fastener testing, in particular to a screw bending resistance testing device. The technical problem is that the existing testing device is difficult to test different parts of the screw at the same time, resulting in low testing efficiency, and it is not convenient to change the support point between the head and tail of the long screw, and it is difficult to test the bending resistance of different parts at different support distances, thereby the bending resistance test of the long screw is not comprehensive. A screw bending resistance testing device, comprising a base and a ring-shaped support, etc.; both sides of the base are fixedly connected with the ring-shaped support. Five extrusion arc plates are used to clamp five long screws, so that the subsequent long screw can be more stably tested for bending resistance. The staff intermittently starts the extension rod of the hydraulic cylinder to push the testing block downward, and then the scanning camera scans the bending radius of the uppermost long screw in real time, so as to test the bending resistance of the uppermost long screw.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fastener testing, in particular to a screw bending resistance testing device. BACKGROUND

[0002] Long screws, as a common fastening element, are widely used in many industrial fields and construction industries. In actual use scenarios, long screws often bear complex external forces, among which bending force is a common and key one. In some structures that bear dynamic load or uneven stress, long screws may be bent and deformed due to lateral pressure, tensile eccentricity and other factors.

[0003] The existing screw bending resistance testing device is usually used to put a long screw into the device first, use a hydraulic cylinder to push the testing block to test the bending resistance of the long screw, then take out the long screw after the test is completed, put a new long screw into the device, adjust the position of the testing block, and then use the testing block to test the long screw. This operation process is relatively cumbersome, resulting in low efficiency of screw bending resistance testing. Moreover, the existing screw bending resistance testing device is not convenient to change the support point between the head and tail of the long screw, and it is difficult to test the bending resistance of different parts at different support distances, resulting in incomplete bending resistance testing of the long screw. SUMMARY

[0004] In order to overcome the above-mentioned shortcomings, the present application provides a screw bending resistance testing device which can simultaneously test the bending resistance of different parts of multiple long screws, improve the efficiency, change the support point between the head and tail of the long screw, and test the bending resistance of different parts at different support distances, thereby more comprehensively testing the bending resistance of the long screw.

[0005] The technical scheme is as follows: a screw bending resistance testing device, comprising a base, an annular support, a connecting mechanism, an extrusion mechanism, a conversion mechanism, a moving mechanism and a scanning camera, wherein,

[0006] Both sides of the base are fixedly connected with annular supports, and the connecting mechanism is arranged between the two annular supports. The connecting mechanism is provided with a mounting structure for mounting the long screw to be tested. The extrusion mechanism is arranged on the connecting mechanism and is used to extrude the long screw.

[0007] The conversion mechanism is arranged on the annular support, and the conversion mechanism is provided with a support plate. The support plate is fixedly connected with the scanning camera at the bottom. The conversion mechanism is used to rotate the connecting mechanism to adjust the long screw aligned with the scanning camera, thereby switching the test object.

[0008] The conversion mechanism is equipped with a moving mechanism, which includes a hydraulic cylinder and a test pressure block. The moving mechanism is used to drive the hydraulic cylinder and the test pressure block to move.

[0009] Optionally, the connecting mechanism includes a head ring, a fixing collar, a tail ring, and a connecting rod, wherein,

[0010] The head ring and the tail ring are respectively disposed on both sides of the annular bracket, and the head ring and the tail ring are fixedly connected by the connecting rod;

[0011] A fixing collar is fixedly connected to one side of the head ring, and the connecting rod is fixedly mounted on the fixing collar, thereby being fixedly connected to the head ring.

[0012] The head ring and the tail ring are respectively provided with multiple through holes and multiple round holes, and the through holes and round holes are arranged in a one-to-one correspondence for the installation of long screws.

[0013] Optionally, at least three connecting rods are provided, and at least five through holes are provided, all of which are evenly spaced along the circumference of the head ring.

[0014] Optionally, the extrusion mechanism includes a clamping ring and an extrusion arc-shaped plate, wherein,

[0015] The head ring and the fixed collar are rotatably connected to the clamping ring. A compression arc plate is fixedly connected to the outside of the clamping ring. When the clamping ring rotates relative to the head ring, the compression arc plate can abut against the corresponding long screw and press the long screw to fix it on the head ring.

[0016] Optionally, the extrusion mechanism further includes a push rod, a fixed support, a locking rod, and an extrusion spring, wherein,

[0017] The clamping ring has a clamping hole, and the head ring has an arc-shaped groove extending circumferentially and a vertical groove extending radially.

[0018] A push rod is fixedly connected to the outside of the clamping ring, and the end of the push rod away from the clamping ring is led out through the arc groove on the head ring.

[0019] A fixed support is fixedly connected to the outside of the fixed collar, and a locking rod is slidably connected to the fixed support. The main body of the locking rod is arranged radially along the fixed collar, and the end of the locking rod away from the fixed collar is led out through the vertical groove of the head ring.

[0020] A compression spring is connected between the locking rod and the fixed support so that when the locking ring moves to the locking hole, the locking rod can pass through the locking hole.

[0021] Optionally, the conversion mechanism comprises a support plate, a servo motor, a power shaft, a sector gear and a fixed gear ring, wherein,

[0022] The support plate is fixedly connected between the two annular supports, the servo motor is fixedly connected to the support plate, the output shaft of the servo motor is fixedly connected to the power shaft, the power shaft is rotatably arranged through the annular supports, the sector gear is fixedly connected to the power shaft, the fixed gear ring is fixedly connected to the outer side of the head ring, the sector gear is engaged with the fixed gear ring, and the head ring is driven to rotate by a predetermined angle when the sector gear continuously rotates, so that the next long screw is positioned at the scanning position of the scanning camera.

[0023] Optionally, the moving mechanism comprises a fixed guide rod, a rotating screw rod, a moving seat, a fixed nut, a fixed pinion, a hydraulic cylinder and a test pressing block, wherein,

[0024] The fixed guide rod is fixedly connected between the upper portions of the two annular supports, the rotating screw rod is rotatably connected between the two annular supports, the moving seat is slidably connected to the fixed guide rod, the fixed nut is fixedly connected to the side of the moving seat away from the fixed guide rod, and the fixed nut is connected with the rotating screw rod through threads, so that the moving seat is driven to slide along the fixed guide rod when the rotating screw rod rotates;

[0025] The fixed pinion is fixedly connected to the end of the rotating screw rod close to the head ring, and the sector gear is engaged with the fixed pinion.

[0026] The hydraulic cylinder is fixedly connected to the bottom of the moving seat, and the test pressing block is fixedly connected to the telescopic rod of the hydraulic cylinder.

[0027] Optionally, it further comprises a support point switching mechanism, the support point switching mechanism is arranged on the two annular supports, and the support point switching mechanism is used for switching the support point of the long screw, the support point switching mechanism comprises a square rod, a moving screw rod, an overrunning clutch, a transmission pinion, a rotating handle, a trapezoidal moving block, a special-shaped rod, a pull ring, a support groove ring, a circular rod and a support ring, wherein,

[0028] The square rod is fixedly connected between the two annular supports, the trapezoidal moving block is slidably connected to the square rod, and the special-shaped rod is fixedly connected to one side of the trapezoidal moving block.

[0029] The pull ring is fixedly connected to the end of the special-shaped rod away from the trapezoidal moving block, the pull ring is arranged in parallel and concentric with the head ring, the support groove ring is rotatably sleeved in the pull ring, and the support groove ring is arranged in parallel and concentric with the head ring.

[0030] A plurality of circular rods are fixedly connected to the support groove ring, the circular rods are arranged to extend towards the head ring, the ends of the circular rods away from the support groove ring are fixedly connected to the support ring, grooves consistent with the number of the through holes are formed in the support ring, and the long screws arranged in the through holes are respectively supported.

[0031] Optionally, a movable screw is rotatably connected between the two annular supports, and an overrunning clutch is fixedly connected to one end of the movable screw close to the head ring, and a transmission pinion is fixedly connected to the outside of the overrunning clutch, and the fixed pinion is engaged with the transmission pinion.

[0032] Optionally, a rotating handle is fixedly connected to one end of the movable screw close to the head ring.

[0033] Beneficial effects: 1. Through the five extrusion arc-shaped plates, the five long screws are clamped, so that the subsequent long screws are more stably subjected to the bending test, the staff intermittently starts the extension rod of the hydraulic cylinder to push the test block to move downward, and then the uppermost long screw is extruded, and the bending radius of the uppermost long screw is scanned in real time by the scanning camera, so that the uppermost long screw is subjected to the bending test.

[0034] 2. The hydraulic cylinder and the test block are intermittently moved by the moving seat, so that the position of the long screw extruded by the hydraulic cylinder and the test block is intermittently changed, and then the five long screws are intermittently driven by the sector gear to be sequentially below the test block, so that the test block can detect the bending of different parts of the five long screws respectively, avoiding the bending test of different parts of the same long screw, so that the test block can perform the bending test on different parts of the long screw under the same support distance.

[0035] 3. The support points between the head ring and the tail ring of the five long screws are intermittently changed by the intermittent movement of the support ring, the support points between the head and the tail of the long screw are simulated, and then the test block intermittently extrudes the five long screws, so that the test block can change the bending test of different parts of the long screw under different support distances between the head and the tail of the long screw, so that the long screw is more comprehensively subjected to the bending test. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a three-dimensional structure schematic view of the base, annular support and head ring of the application.

[0037] Figure 2 It is a partial three-dimensional structure schematic view of the conversion mechanism and the moving mechanism of the application.

[0038] Figure 3 It is a three-dimensional structure schematic view of the annular support, head ring and tail ring of the application.

[0039] Figure 4 It is a three-dimensional structure schematic view of the annular support, head ring and tail ring of the application. Figure 3 It is an enlarged three-dimensional structure schematic view of A in the application.

[0040] Figure 5This is a three-dimensional structural diagram of the head ring, fixed toothed ring, and part of the extrusion mechanism of the present invention.

[0041] Figure 6 This is a three-dimensional structural diagram of the ring support and part of the conversion mechanism of the present invention.

[0042] Figure 7 This is a partial three-dimensional structural diagram of the conversion mechanism, the moving mechanism, and the support point switching mechanism of the present invention.

[0043] Figure 8 This is a three-dimensional structural diagram of the annular bracket and the partial support point switching mechanism of the present invention.

[0044] Figure 9 This is a partial three-dimensional structural diagram of the annular bracket, fixed guide rod, and support point switching mechanism of the present invention.

[0045] Figure 10 This is a partial three-dimensional schematic diagram of the moving mechanism and support point switching mechanism of the present invention.

[0046] Figure 11 This is a three-dimensional structural diagram showing the disassembled components of the annular support, head ring, fixing collar, and tail ring of the present invention.

[0047] The components are: 1. Base; 2. Ring-shaped bracket; 3. Head ring; 31. Fixing collar; 4. Tail ring; 5. Connecting rod; 6. Long screw; 71. Clamping ring; 72. Push rod; 73. Fixing support; 74. Clamping rod; 75. Compression spring; 76. Compression arc plate; 81. Support plate; 82. Servo motor; 83. Power shaft; 84. Sector gear; 85. Fixing gear ring; 91. Fixing guide rod; 92. Rotating screw. 93_Moving seat, 94_Fixing nut, 96_Fixing pinion, 97_Hydraulic cylinder body, 98_Test pressure block, 12_Scanning camera, 101_Square rod, 102_Moving screw, 103_Overrunning clutch, 104_Transmission pinion, 105_Rotating handle, 106_Trapezoidal moving block, 107_Irregular rod, 108_Pull ring, 109_Support groove ring, 1010_Round rod, 1011_Support ring. Detailed Implementation

[0048] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0049] Example 1: A screw bending resistance testing device, such as Figures 1-11As shown, including the base 1, ring support 2, connecting mechanism, extrusion mechanism, conversion mechanism, moving mechanism and scanning camera 12, the base 1 both sides are fixedly connected with the ring support 2, two ring support 2 between the connecting mechanism is equipped with long screw 6, the connecting mechanism is equipped with extrusion mechanism, extrusion mechanism for extruding long screw 6, ring support 2 is equipped with conversion mechanism, conversion mechanism for rotating long screw 6, conversion mechanism is equipped with moving mechanism, moving mechanism is equipped with hydraulic cylinder body 97, test block 98, moving mechanism for driving hydraulic cylinder body 97, test block 98 moves, conversion mechanism is equipped with support plate 81, support plate 81 bottom fixedly connected with scanning camera 12, scanning camera 12 for detecting the bending degree of long screw 6.

[0050] Connecting mechanism includes head ring 3, fixed sleeve ring 31, tail ring 4, connecting rod 5 and long screw 6, one of the ring support 2 inside sleeve has head ring 3, one side of the head ring 3 is fixedly connected with the fixed sleeve ring 31, the other ring support 2 is sleeved with the tail ring 4, three connecting rods 5 are welded on one side of the fixed sleeve ring 31 close to the tail ring 4, the three connecting rods 5 are welded with the inner side of the tail ring 4, five perforations are opened on the head ring 3, five round holes are opened on the tail ring 4, the long screw 6 is inserted between the five perforations of the head ring 3 and the five round holes of the tail ring 4 respectively, and the long screw 6 has five.

[0051] Extrusion mechanism includes clamping ring 71, push rod 72, fixed support 73, clamping rod 74, extrusion spring 75 and extrusion arc plate 76, the head ring 3 and the fixed sleeve ring 31 are rotatably connected with the clamping ring 71, the clamping ring 71 is provided with a clamping hole, the head ring 3 is provided with an arc slot and a vertical slot, the push rod 72 is fixedly connected with the outer side of the clamping ring 71, the end of the push rod 72 away from the clamping ring 71 penetrates through the arc slot on the head ring 3, the fixed support 73 is fixedly connected with the outer side of the fixed sleeve ring 31, the clamping rod 74 is slidably connected with the fixed support 73, the other end of the clamping rod 74 penetrates through the vertical slot of the head ring 3, the extrusion spring 75 is connected between the clamping rod 74 and the fixed support 73, and the five extrusion arc plates 76 are fixedly connected with the outer side of the clamping ring 71.

[0052] Five extrusion arc plates 76 extrude five long screws 6 respectively.

[0053] The conversion mechanism includes a support plate 81, a servo motor 82, a power shaft 83, a sector gear 84 and a fixed gear ring 85, the two ring supports 2 are fixedly connected with the support plate 81, the support plate 81 is fixedly connected with the servo motor 82, the output shaft of the servo motor 82 is fixedly connected with the power shaft 83, the power shaft 83 penetrates through one of the ring supports 2, the end of the power shaft 83 away from the servo motor 82 is welded with the sector gear 84, the outer side of the head ring 3 is fixedly connected with the fixed gear ring 85, and the sector gear 84 is engaged with the fixed gear ring 85.

[0054] The moving mechanism comprises a fixed guide rod 91, a rotating screw rod 92, a moving seat 93, a fixed nut 94, a fixed pinion 96, a hydraulic cylinder body 97 and a test pressing block 98, the two annular supports 2 are fixedly connected with the fixed guide rod 91 between the upper portions, the rotating screw rod 92 is rotatably connected between the two annular supports 2, the moving seat 93 is slidably connected on the fixed guide rod 91, the moving seat 93 is fixedly connected with the fixed nut 94 on the side away from the fixed guide rod 91, the fixed nut 94 is connected with the rotating screw rod 92 through threads, the rotating screw rod 92 is fixedly connected with the fixed pinion 96 on the end close to the head portion ring 3, the sector gear 84 is engaged with the fixed pinion 96, the moving seat 93 is fixedly connected with the hydraulic cylinder body 97 at the bottom, and the test pressing block 98 is fixedly connected on the telescopic rod of the hydraulic cylinder body 97.

[0055] At the beginning, the clamping ring 71 extrudes the clamping rod 74, the compression spring 75 is compressed, the upper part of the clamping rod 74 is above the vertical slot in the head ring 3, the push rod 72 is on the side away from the clamping rod 74 of the arc-shaped slot of the head ring 3, when the long screw 6 needs to be tested for bending, the worker puts five long screws 6 into the five perforations of the head ring 3 and the round holes of the tail ring 4 respectively, pushes the push rod 72, the clamping ring 71 and the five extrusion arc-shaped plates 76 to rotate clockwise, the push rod 72 rotates clockwise along the arc-shaped slot of the head ring 3, the clamping ring 71 rotates clockwise along the fixed sleeve ring 31, the five extrusion arc-shaped plates 76 extrude the five long screws 6 respectively, the clamping ring 71 no longer extrudes the clamping rod 74, under the restoring force of the compression spring 75, the clamping rod 74 is clamped into the clamping hole of the clamping ring 71, through the five extrusion arc-shaped plates 76, the five long screws 6 are clamped, so that the subsequent long screw 6 can be more stably tested for bending resistance, then the scanning camera 12 and the servo motor 82 are started, the output shaft of the servo motor 82 reverses to drive the power shaft 83 and the sector gear 84 to reverse together, the sector gear 84 reverses to drive the head ring 3 and the fixed gear ring 85 to rotate clockwise together, the head ring 3 drives the fixed sleeve ring 31, the three connecting rods 5, the five long screws 6, the five extrusion arc-shaped plates 76 and the tail ring 4 to reverse together, one of the long screws 6 rotates to the lower side of the hydraulic cylinder body 97 and the test block 98, the sector gear 84 continues to reverse, the sector gear 84 disengages from the fixed gear ring 85, the sector gear 84 no longer drives the fixed gear ring 85 and the head ring 3 to rotate, and the five long screws 6 no longer rotate clockwise, then the worker starts the hydraulic cylinder body 97 intermittently, the extension rod of the hydraulic cylinder body 97 moves downward to drive the test block 98 to move downward together, the test block 98 extrudes the uppermost long screw 6, the worker pushes the test block 98 downward by starting the extension rod of the hydraulic cylinder body 97 intermittently, so as to extrude the uppermost long screw 6, and then the scanning camera 12 scans the bending curvature of the uppermost long screw 6 in real time, so as to test the uppermost long screw 6 for bending resistance, the sector gear 84 continues to reverse, the sector gear 84 reverses to drive the fixed pinion 96 and the rotating screw rod 92 to rotate clockwise, under the guidance of the fixed guide rod 91, the rotating screw rod 92 rotates clockwise to drive the fixed nut 94 and the moving seat 93 to move towards the tail ring 4 through the thread, the moving seat 93 drives the hydraulic cylinder body 97 and the test block 98 to move together, the moving seat 93 drives the hydraulic cylinder body 97 and the test block 98 to move intermittently, so as to change the position of the hydraulic cylinder body 97 and the test block 98 extruding the long screw 6 intermittently, and then the sector gear 84 drives the five long screws 6 to be in the lower side of the test block 98 in turn, so that the test block 98 can test the different parts of the five long screws 6 respectively, avoiding testing the bending resistance of the different parts of the same long screw 6, so that the test block 98 can test the different parts of the long screw 6 for bending resistance under the same support distance, when the bending resistance test of the five long screws 6 is completed,The staff closes the servo motor 82 and the scanning camera 12, the output shaft of the servo motor 82 no longer drives the sector gear 84 to reverse, the sector gear 84 no longer reverses and no longer drives the fixed gear ring 85, the head ring 3 and the five long screws 6 to rotate forward, the staff first manually pulls the clamping rod 74 upwards, the compression spring 75 is compressed, the clamping rod 74 no longer clamps the clamping hole of the clamping ring 71, and then rotates the push rod 72 to reset, the push rod 72 resets the clamping ring 71 and the five extrusion arc-shaped plates 76, the five extrusion arc-shaped plates 76 no longer extrude the five long screws 6 respectively, then the five long screws 6 are taken out from the five perforations of the head ring 3 and the five round holes of the tail ring 4 in turn, and finally the rotating screw rod 92 is reset, under the guidance of the fixed guide rod 91, the rotating screw rod 92 resets the moving seat 93, the hydraulic cylinder body 97 and the test pressing block 98.

[0056] Example 2: Based on example 1, as shown in Figures 7-11 The support point switching mechanism is further arranged on the two annular supports 2, and is used to switch the support points of the long screws 6. The support point switching mechanism comprises a square rod 101, a moving screw rod 102, an overrunning clutch 103, a transmission pinion 104, a rotating handle 105, a trapezoidal moving block 106, a special-shaped rod 107, a pull ring 108, a support groove ring 109, a circular rod 1010 and a support ring 1011. The square rod 101 is fixedly connected between the two annular supports 2. The moving screw rod 102 is rotatably connected between the two annular supports 2. The overrunning clutch 103 is fixedly connected to one end of the moving screw rod 102 close to the head ring 3. The transmission pinion 104 is fixedly connected to the outer side of the overrunning clutch 103. The transmission pinion 104 is engaged with the fixed pinion 96. The rotating handle 105 is welded to one end of the moving screw rod 102 close to the head ring 3. The trapezoidal moving block 106 is slidably connected to the square rod 101. The special-shaped rod 107 is fixedly connected to one side of the trapezoidal moving block 106. The pull ring 108 is fixedly connected to one end of the special-shaped rod 107 away from the trapezoidal moving block 106. The support groove ring 109 is sleeved on the inner side of the pull ring 108. Three circular rods 1010 are fixedly connected to one side of the support groove ring 109 close to the tail ring 4. The support ring 1011 is welded between one ends of the three circular rods 1010 away from the support groove ring 109. Five grooves are formed in the support ring 1011, and the five long screws 6 are arranged in the five grooves of the support ring 1011.

[0057] At the beginning, when the rotating screw 92 and the fixed pinion 96 rotate forward, the fixed pinion 96 rotates forward to drive the transmission pinion 104 to rotate reversely, under the action of the overrunning clutch 103, the transmission pinion 104 reversely rotating will not drive the moving screw 102 to rotate, when it is necessary to change the support point of the long screw 6 for testing, the staff starts the servo motor 82 to rotate forward and intermittently starts the hydraulic cylinder 97, the output shaft of the servo motor 82 rotates forward to drive the power shaft 83 and the sector gear 84 to rotate forward, the sector gear 84 rotating forward continues to drive the fixed gear ring 85 and the head ring 3 to rotate reversely, the sector gear 84 rotating forward drives the intermittent drive fixed pinion 96 to rotate reversely, the fixed pinion 96 rotating reversely drives the rotating screw 92 to rotate reversely, the rotating screw 92 rotating reversely drives the moving seat 93, the hydraulic cylinder 97 and the test pressing block 98 to reset from the position close to the tail ring 4 to the position close to the head ring 3, the fixed pinion 96 rotating reversely drives the transmission pinion 104 to rotate forward, the transmission pinion 104 rotating forward drives the overrunning clutch 103 and the moving screw 102 to rotate forward, under the guidance of the square rod 101, the moving screw 102 rotating forward drives the trapezoidal moving block 106 to move towards the tail ring 4, the trapezoidal moving block 106 moving drives the special-shaped rod 107 and the pull ring 108 to move towards the tail ring 4 together, the pull ring 108 drives the support groove, the three circular rods 1010 and the support ring 1011 to move intermittently together, the hydraulic cylinder 97 intermittently drives the test pressing block 98 to move downward, the test pressing block 98 extrudes the long screw 6 in the uppermost position, through the intermittent movement of the support ring 1011, the support points between the head ring 3 and the tail ring 4 of the five long screws 6 are intermittently changed, the support points between the head and the tail of the long screw 6 are simulated at different distances, and then the test pressing block 98 is intermittently extruded to test the five long screws 6, so that the test pressing block 98 can change the support distance between the head and the tail of the long screw 6 and test different parts under different support distances, so as to more comprehensively test the long screw 6, and finally, after the long screw 6 is tested, the staff reverses the rotating handle 105, the rotating handle 105 reverses to drive the moving screw 102 to reverse, the moving screw 102 reverses to reset the trapezoidal moving block 106, the special-shaped rod 107, the pull ring 108, the support groove ring 109, the circular rod 1010 and the support ring 1011.

[0058] Although the present disclosure has been shown and described with respect to certain exemplary embodiments thereof, it should be understood by the skilled in the art that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined by the appended claims and equivalents thereof.

Claims

1. A screw bending resistance testing device, characterized in that: It includes a base (1), a ring-shaped support (2), a connecting mechanism, a pressing mechanism, a conversion mechanism, a moving mechanism, and a scanning camera (12), wherein, Both sides of the base (1) are fixedly connected with ring brackets (2), and a connecting mechanism is provided between the two ring brackets (2). The connecting mechanism is provided with an installation structure for installing the long screw (6) to be tested, and a pressing mechanism is provided on the connecting mechanism for pressing the long screw (6). The ring bracket (2) is provided with a conversion mechanism, and the conversion mechanism is provided with a support plate (81). A scanning camera (12) is fixedly connected to the bottom of the support plate (81). The conversion mechanism is used to rotate the connection mechanism to adjust the long screw (6) aligned with the scanning camera (12) and thus switch the test object. The conversion mechanism is provided with a moving mechanism, and the moving mechanism is provided with a hydraulic cylinder (97) and a test pressure block (98). The moving mechanism is used to drive the hydraulic cylinder (97) and the test pressure block (98) to move. The connecting mechanism includes a head ring (3), a fixing collar (31), a tail ring (4), and a connecting rod (5), wherein... The head ring (3) and the tail ring (4) are respectively disposed on both sides of the annular bracket (2), and the head ring (3) and the tail ring (4) are fixedly connected by the connecting rod (5); A fixing collar (31) is fixedly connected to one side of the head ring (3), and the connecting rod (5) is fixedly mounted on the fixing collar (31) so as to be fixedly connected to the head ring (3); The head ring (3) and the tail ring (4) are respectively provided with multiple through holes and multiple round holes, and the through holes and the round holes are arranged one-to-one for the installation of long screws (6); The extrusion mechanism includes a clamping ring (71), an extrusion arc plate (76), a push rod (72), a fixed support (73), a clamping rod (74), and an extrusion spring (75), wherein... The head ring (3) is rotatably connected to the fixing ring (31) with the clamping ring (71). The outer side of the clamping ring (71) is fixedly connected with the extrusion arc plate (76), which is used to press the long screw (6) against the corresponding long screw (6) when the clamping ring (71) rotates relative to the head ring (3), so that the extrusion arc plate (76) can be pressed and fixed on the head ring (3). The clamping ring (71) has a clamping hole, and the head ring (3) has an arc-shaped groove extending in the circumferential direction and a vertical groove extending in the radial direction. A push rod (72) is fixedly connected to the outside of the clamping ring (71). One end of the push rod (72) away from the clamping ring (71) is led out through the arc groove on the head ring (3). A fixed support (73) is fixedly connected to the outside of the fixed collar (31), and a locking rod (74) is slidably connected to the fixed support (73). The main body of the locking rod (74) is arranged radially along the fixed collar (31), and the end of the locking rod (74) away from the fixed collar (31) is led out through the vertical groove of the head ring (3). A compression spring (75) is connected between the locking rod (74) and the fixed support (73) so that when the locking ring (71) moves to the locking hole of the locking rod (74), the locking rod (74) can pass through the locking hole.

2. The screw bending resistance testing device as described in claim 1, characterized in that: At least three connecting rods (5) are provided, and at least five through holes are provided, all of which are evenly spaced along the circumference of the head ring (3).

3. The screw bending resistance testing device as described in claim 1, characterized in that: The conversion mechanism includes a support plate (81), a servo motor (82), a power shaft (83), a sector gear (84), and a fixed gear ring (85), wherein, A support plate (81) is fixedly connected between two ring brackets (2). A servo motor (82) is fixedly connected on the support plate (81). A power shaft (83) is fixedly connected on the output shaft of the servo motor (82). The power shaft (83) passes through the ring bracket (2) and is rotatably set. A sector gear (84) is fixedly connected on the power shaft (83). A fixed gear ring (85) is fixedly connected to the outside of the head ring (3). The sector gear (84) meshes with the fixed gear ring (85). When the sector gear (84) rotates continuously, it can drive the head ring (3) to rotate at a predetermined angle in a timed manner, thereby placing the next long screw (6) at the scanning position of the scanning camera (12).

4. The screw bending resistance testing device as described in claim 3, characterized in that: The moving mechanism includes a fixed guide rod (91), a rotating screw (92), a moving seat (93), a fixed nut (94), a fixed pinion (96), a hydraulic cylinder (97), and a test pressure block (98), wherein, A fixed guide rod (91) is fixedly connected between the upper parts of the two ring brackets (2), and a rotating screw (92) is rotatably connected between the two ring brackets (2). A movable seat (93) is slidably connected on the fixed guide rod (91). A fixed nut (94) is fixedly connected to the side of the movable seat (93) away from the fixed guide rod (91). The fixed nut (94) is connected to the rotating screw (92) by a thread, so that when the rotating screw (92) rotates, the movable seat (93) can be driven to slide along the fixed guide rod (91) through the fixed nut (94). A fixed pinion (96) is fixedly connected to one end of the rotating screw (92) near the head ring (3), and the sector gear (84) meshes with the fixed pinion (96); A hydraulic cylinder (97) is fixedly connected to the bottom of the movable seat (93), and a test pressure block (98) is fixedly connected to the telescopic rod of the hydraulic cylinder (97).

5. The screw bending resistance testing device as described in claim 4, characterized in that: It also includes a support point switching mechanism. The two annular brackets (2) are equipped with the support point switching mechanism, which is used to switch the support point of the long screw (6). The support point switching mechanism includes a square rod (101), a moving screw (102), an overrunning clutch (103), a transmission pinion (104), a rotating handle (105), a trapezoidal moving block (106), a shaped rod (107), a pull ring (108), a support groove ring (109), a round rod (1010), and a support ring (1011). A square rod (101) is fixedly connected between two ring supports (2). A trapezoidal moving block (106) is slidably connected on the square rod (101). A non-circular rod (107) is fixedly connected to one side of the trapezoidal moving block (106). A pull ring (108) is fixedly connected to one end of the irregular rod (107) away from the trapezoidal moving block (106). The pull ring (108) is set parallel and concentrically with the head ring (3). A support groove ring (109) is rotatably sleeved on the inner side of the pull ring (108). Multiple round rods (1010) are fixedly connected to the support groove ring (109). The round rods (1010) extend toward the head ring (3), and a support ring (1011) is fixedly connected between the ends of the round rods (1010) away from the support groove ring (109). The support ring (1011) has grooves with the same number of holes as the holes, so as to support the long screws (6) set in each hole respectively.

6. The screw bending resistance testing device as described in claim 5, characterized in that: A movable screw (102) is rotatably connected between two ring brackets (2). An overrunning clutch (103) is fixedly connected to one end of the movable screw (102) near the head ring (3). A transmission pinion (104) is fixedly connected to the outside of the overrunning clutch (103). The fixed pinion (96) meshes with the transmission pinion (104).

7. The screw bending resistance testing device as described in claim 6, characterized in that: The movable screw (102) is fixedly connected to a rotating handle (105) at one end near the head ring (3).

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