Bolt testing machine

Abstract

The utility model belongs to the technical field of testing devices, and particularly relates to a bolt testing machine which comprises a strength testing mechanism. The first upper clamp is provided with a clamp insertion through hole which is in insertion connection with a test product; the first lower clamp is arranged on the test bed, is positioned below the first upper clamp and is provided with a clamp internal thread which is in threaded connection with the test product; the first lifting mechanism is arranged on the rack and provided with a first lifting end, and the first lifting end is located above the first upper clamp and connected with the first upper clamp through a first force sensor. The bolt strength tester can be used for testing the strength of various bolts.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of testing device, specifically relates to a bolt testing testing machine. BACKGROUND

[0002] The connecting piece such as screw or bolt is a kind of special threaded connecting piece used for fixing pipeline support / hanging bracket or equipment on wall, floor or column.The strength of threaded connecting piece is an important index for measuring the quality of threaded connecting piece, so a testing machine for detecting the strength of threaded connecting piece is required. SUMMARY

[0003] The utility model provides a bolt testing testing machine to solve the above technical problems.

[0004] A bolt testing testing machine, the bolt testing testing machine includes strength testing mechanism, and the strength testing mechanism includes:

[0005] Frame, be provided with test table;

[0006] First upper clamp, with the clamp insertion hole of insertion of test product;

[0007] First lower clamp, be arranged on the test table and be located below the first upper clamp, with the clamp internal thread of test product threaded connection;

[0008] First lifting mechanism, be arranged on the frame, with first lifting end, the first lifting end is located above the first upper clamp, and the first lifting end is connected the first upper clamp through first force sensor.

[0009] Optionally, the first upper clamp includes:

[0010] First upper insertion block, middle part is equipped with the insertion hole of up-and-down intercommunication;

[0011] First upper connecting column, upper portion is connected with the first force sensor, lower portion is provided with upper insertion port, and the first upper connecting column is connected with the first upper insertion block through the upper insertion port.

[0012] Optionally, the first lower clamp includes:

[0013] First lower connecting block, middle part is provided with the thread hole of open top;

[0014] First lower connecting column, bottom is arranged on the test table, upper portion is provided with lower insertion port, and the first lower connecting column is connected with the first lower connecting block through the lower insertion port.

[0015] Optionally, the first lifting mechanism includes:

[0016] a driving motor;

[0017] two ball screws, vertically arranged on the test bench respectively, the bottom end of the ball screw penetrating through the bottom of the test bench and connected with the driving motor through a transmission mechanism, driven by the driving motor to rotate simultaneously;

[0018] two screw nuts, arranged on the corresponding ball screw respectively, driven by the ball screw to move up and down;

[0019] a driving plate, fixed with the screw nut to move up and down, serving as the first lifting end of the first lifting mechanism;

[0020] a top plate, arranged above the driving plate, fixing the top end of the ball screw.

[0021] Optionally, the first lifting mechanism further comprises:

[0022] two guide columns, arranged on the side of the ball screw respectively, fixed with the test bench at the bottom end and fixed with the top plate after penetrating through the driving plate at the top end.

[0023] Optionally, the bolt test machine further comprises a pull test mechanism, the pull test mechanism comprising:

[0024] a pull test fixed block, arranged on the side of the rack;

[0025] a second clamp, having a clamp internal thread threadedly connected with the test product;

[0026] a second lifting mechanism, arranged on the pull test fixed block, having a second lifting end arranged above the second clamp, the second lifting end connected with a second force sensor;

[0027] a pull test connecting rod, axially vertically arranged, connected with the second clamp at the bottom end and connected with a pull test connecting block at the top end, the pull test connecting block connected with a pull test transition block through a pull test thrust bearing, the pull test transition block arranged above the second force sensor.

[0028] Optionally, the second clamp comprises:

[0029] a second connecting block, having a bottom-open threaded hole arranged in the middle part;

[0030] a second connecting column, having a second insertion port arranged in the lower part, the second connecting column insertedly connected with the second connecting block through the second insertion port.

[0031] Optionally, the second lifting mechanism adopts a hydraulic jack, a support part connected with a large piston in the hydraulic jack serving as the second lifting end, and a small piston rod connected with a small piston in the hydraulic jack connecting the first lifting end of the first lifting mechanism, the support part being driven by the first lifting mechanism to perform lifting action.

[0032] Optionally, the pull-out test connecting rod passes through the middle part of the large oil cylinder, the large piston and the support part in the hydraulic jack.

[0033] Optionally, the pull-out test mechanism further comprises:

[0034] A pull rope displacement sensor, the pull rope of which is connected to the second lifting end.

[0035] Optionally, the bolt test machine further comprises a shear test mechanism, the shear test mechanism comprising:

[0036] A shear test fixed block located at the side of the rack;

[0037] A third clamp having clamp internal threads threadedly connected with the test product;

[0038] A translation mechanism provided on the shear test fixed block and having a translation end located at the side of the third clamp, the translation end being connected with a third force sensor;

[0039] A shear test connecting rod, the axial direction of which is horizontal, one side of which is connected with the third clamp, and the other side of which is connected with a shear test connecting block, the shear test connecting block being connected with a shear test transition block through a shear test thrust bearing, the shear test transition block being located at the side of the third force sensor and opposite to the third force sensor.

[0040] Optionally, the third clamp comprises:

[0041] A third connecting block, the middle part of which is provided with a thread hole with an open bottom;

[0042] A third connecting sleeve, the middle part of which is provided with a sleeve interface with an open bottom, the third connecting sleeve being sleeved on the outside of the third connecting block through the sleeve interface.

[0043] Optionally, the translation mechanism adopts a hydraulic jack, a support part connected with a large piston in the hydraulic jack serving as the translation end, and a small piston rod connected with a small piston in the hydraulic jack connecting the first lifting end of the first lifting mechanism, the support part being driven by the first lifting mechanism to perform translation action.

[0044] Optionally, the shear test connecting rod passes through the middle part of the large oil cylinder, the large piston and the support part in the hydraulic jack.

[0045] Optionally, the shearing test mechanism further comprises:

[0046] A pull rope displacement sensor, a pull rope of which is connected to the translation end.

[0047] Optionally, the pull-out test mechanism shares the small cylinder, small piston and small piston rod part of the hydraulic jack with the shearing test mechanism.

[0048] Optionally, the bolt test machine further comprises a rotatable hoist arm, which is installed on the rack, and the hoist arm has a stroke range including at least one of the pull-out test fixed block and the shearing test fixed block.

[0049] Beneficial effects: the utility model can test the strength test of various bolts, the strength test of various raw materials and the expansion bolt pull-out and shearing test. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is a whole structure schematic view of the utility model;

[0051] Figure 2 It is a front view of Figure 1

[0052] Figure 3 It is a structure schematic view of the strength test mechanism of the utility model;

[0053] Figure 4 It is a partial structure schematic view of Figure 3

[0054] Figure 5 It is a structure schematic view of the pull-out test mechanism of the utility model;

[0055] Figure 6 It is a partial structure schematic view of Figure 5

[0056] It is a sectional view of Figure 7 Figure 5

[0057] Figure 8 It is a structure schematic view of the shearing test mechanism of the utility model;

[0058] Figure 9 It is a partial structure schematic view of Figure 8 DETAILED DESCRIPTION

[0059] ​​​​​The preferred embodiments of the present application will be described in detail below with reference to the drawings, so that the purpose, characteristics and advantages of the present application can be more clearly understood. It should be understood that the embodiments shown in the drawings are not a limitation on the scope of the present application, but only to illustrate the essential spirit of the technical scheme of the present application.

[0060] In the following description, for the purpose of illustrating various disclosed embodiments, specific details are set forth in order to provide a thorough understanding of various disclosed embodiments. However, one skilled in the relevant arts will recognize that embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring the description of embodiments.

[0061] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. In addition, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0062] In the following description, in order to clearly show the structure and working mode of the present application, many directional words will be used for description, but the words of "front", "back", "left", "right", "outer", "inner", "outward", "inward", "up", "down" and the like should be understood as convenient language, and should not be understood as limiting words.

[0063] With reference to Figures 1-2 The bolt testing machine provided by the embodiment of the present application comprises a strength testing mechanism 1, and the strength testing mechanism 1 is used for bolt strength testing.

[0064] With reference to Figure 3 The strength testing mechanism 1 comprises a rack 11, a first upper clamp 12, a first lower clamp 13, a first lifting mechanism 14 and a first force sensor 15.

[0065] The rack 11 is provided with a test table 111. The first upper clamp 12 has a clamp insertion hole for inserting a test product. The first lower clamp 13 is arranged on the test table 111 and located below the first upper clamp 12, and the first lower clamp 13 has an inner thread for threadedly connecting with the test product. The first lifting mechanism 14 is arranged on the rack 11, and the first lifting mechanism 14 has a first lifting end located above the first upper clamp 12, and the first lifting end is connected with the first upper clamp 12 through the first force sensor 15.

[0066] The utility model discloses a bolt strength test device, which comprises a test table, a first upper clamp, a first lower clamp and a first lifting mechanism.

[0067] In an embodiment, referring to Figure 4 , the first upper clamp 12 comprises a first upper insertion block 121 and a first upper connecting column 122.

[0068] The middle part of the first upper insertion block 121 is provided with an insertion hole communicating with the upper and lower parts. The upper part of the first upper connecting column 122 is connected with the first force sensor 15, and the lower part of the first upper connecting column 122 is provided with an upper insertion port. The first upper connecting column 122 is connected with the first upper insertion block 121 through the upper insertion port.

[0069] Specifically, as shown in the figure, Figure 4 the first upper insertion block 121 is horizontally inserted into the upper insertion port of the first upper connecting column 122.

[0070] In an embodiment, referring to Figure 4 , the first lower clamp 13 comprises a first lower connecting block 131 and a first lower connecting column 132.

[0071] The middle part of the first lower connecting block 131 is provided with a threaded hole with an open top. The bottom of the first lower connecting column 132 is arranged on the test table 111, and the upper part of the first lower connecting column 132 is provided with a lower insertion port. The first lower connecting column 132 is connected with the first lower connecting block 131 through the lower insertion port.

[0072] Specifically, as shown in the figure, Figure 4 the first lower connecting block 131 is horizontally inserted into the lower insertion port of the first lower connecting column 132.

[0073] In an embodiment, the first lifting mechanism 14 can adopt a common lifting mechanism in the prior art.

[0074] The first lifting mechanism 14 can also be designed as follows:

[0075] Referring to Figure 3 , the first lifting mechanism 14 comprises a driving motor 141, two ball screws 142, two screw nuts 143, a driving plate 144 and a top plate 145.

[0076] Two ball screws 142 are vertically arranged on the test bench 111 respectively, the bottom end of the ball screw 142 passes through the bottom of the test bench 111 and is connected with the driving motor 141 through a transmission mechanism, and the two ball screws 142 are driven to rotate simultaneously by the driving motor 141. Two screw nuts 143 are arranged on the corresponding ball screw 142 respectively, and the screw nut 143 is driven to move up and down by the ball screw 142. A driving plate 144 is fixed with the two screw nuts 143 respectively, and the driving plate 144 is driven to move up and down by the screw nut 143, and the driving plate 144 is the first lifting end of the first lifting mechanism 14. A top plate 145 is arranged above the driving plate 144, and the top plate 145 fixes the top end of the ball screw 142.

[0077] Of course, the top plate 145 is fixedly connected with the top end of the ball screw 142 through a bearing. The ball screw 142 and the test bench 111 can also be fixedly connected through another bearing.

[0078] When the driving motor 141 rotates, the two ball screws 142 rotate, drive the two screw nuts 143 and the driving plate 144 fixed therewith to move up and down, and further drive the first upper clamp 12 and the first force sensor 15 to move up and down.

[0079] In an embodiment, referring to Figure 3 , the first lifting mechanism 14 further comprises two guide columns 146, and the two guide columns 146 are arranged on the side of the two ball screws 142 respectively. The bottom end of the guide column 146 is fixed with the test bench 111, and the top end of the guide column 146 passes through the driving plate 144 and is fixed with the top plate 145.

[0080] In an embodiment, referring to Figure 1 and Figure 2 , the bolt test machine further comprises a pull-out test mechanism 2, and the pull-out test mechanism 2 is used for expansion bolt pull-out test.

[0081] Referring to Figures 5-7 , the pull-out test mechanism 2 comprises a pull-out test fixed block 21, a second clamp 22, a second lifting mechanism 23, a pull-out test connecting rod 24, a second force sensor 25, a pull-out test connecting block 26, a pull-out test thrust bearing 27 and a pull-out test transition block 28.

[0082] The pull-out test fixing block 21 is located at the side of the frame 11. The pull-out test fixing block 21 is preferably a cement block. The pull-out test fixing block 21 is used to fix the expansion bolt therein. The second clamp 22 has clamp inner threads for screwing with the test product. The second lifting mechanism 23 is arranged on the pull-out test fixing block 21, and the second lifting mechanism 23 has a second lifting end above the second clamp 22, and the second lifting end is connected with the second force sensor 25. The pull-out test connecting rod 24 is vertically arranged, and the bottom end of the pull-out test connecting rod 24 is connected with the second clamp 22, and the top end of the pull-out test connecting rod 24 is connected with the pull-out test connecting block 26, and the pull-out test connecting block 26 is connected with the pull-out test transition block 28 through the pull-out test thrust bearing 27, and the pull-out test transition block 28 is above the second force sensor 25.

[0083] When the embodiment is used, part of the expansion bolt is installed in the pull-out test fixing block 21, and the other part is exposed from the pull-out test fixing block 21, and the exposed part is screwed with the second clamp 22 to complete the fixation of the expansion bolt. The second lifting mechanism 23 is driven to ascend, and the second force sensor 25 is driven to ascend, and the second force sensor 25 pushes the pull-out test transition block 28 above it upward, and due to the fixation of the expansion bolt, the second force sensor 25 can realize force detection through the downward reaction force of the pull-out test connecting rod 24 and the pull-out test connecting block 26 on the pull-out test transition block 28, so as to realize the purpose of the pull-out test of the expansion bolt.

[0084] In an embodiment, referring to Figure 6 , the second clamp 22 comprises a second connecting block 221 and a second connecting column 222.

[0085] The middle part of the second connecting block 221 is provided with a threaded hole with an open bottom. The lower part of the second connecting column 222 is provided with a second plug-in interface, and the second connecting column 222 is plug-in connected with the second connecting block 221 through the second plug-in interface.

[0086] Specifically, as Figure 6 shown, the second connecting block 221 is horizontally plug-in connected in the second plug-in interface of the second connecting column 222.

[0087] In an embodiment, the second lifting mechanism 23 can adopt the commonly used lifting mechanism in the prior art.

[0088] The second lifting mechanism 23 can also be designed as follows:

[0089] Referring to Figure 7 , the second lifting mechanism 23 adopts a hydraulic jack, and a support part 231 connected with a large piston in the hydraulic jack serves as the second lifting end. Referring to Figure 3The small piston rod 232 connected with the small piston in the hydraulic jack is connected with the first lifting end of the first lifting mechanism 14, and the support part 231 is driven to lift by the first lifting mechanism 14.

[0090] The hydraulic jack used in the embodiment is a prior art, and generally has a large cylinder, a large piston, a support part, a small cylinder, a small piston, a small piston rod and a handle. The support part is used to support the heavy object to be lifted, and the handle is used to drive the support part to lift. In the embodiment, the handle is removed, and the first lifting mechanism 14 is used to replace the handle to drive the support part to lift.

[0091] In the implementation, the pipeline between the handle and the small cylinder can be realized by a hose, so that the large cylinder part can be placed on the drawing test fixed block 21.

[0092] In an embodiment, referring to Figure 7 , the drawing test connecting rod 24 passes through the middle part of the large cylinder, the large piston and the support part 231 in the hydraulic jack.

[0093] In the implementation, the contact part of the drawing test connecting rod 24 with the hydraulic jack can be sealed and connected by a sealing ring.

[0094] In an embodiment, referring to Figure 5 , the drawing test mechanism 2 further comprises a pulling rope displacement sensor 29, and the pulling rope of the pulling rope displacement sensor 29 is connected with the second lifting end.

[0095] Of course, the body of the pulling rope displacement sensor 29 can be installed on a non-moving part, for example, a non-moving end of the first lifting mechanism 14, and more preferably, outside the cylinder body of the large cylinder.

[0096] In an embodiment, referring to Figure 1 and Figure 2 , the bolt test testing machine further comprises a shear test mechanism 3, which is used for bolt shear test.

[0097] The shear test mechanism 3 is the same as the drawing test mechanism 2 in structure except that the clamps used by the shear test mechanism 3 are different from those used by the drawing test mechanism 2. In the specific use, the other structures of the drawing test mechanism 2 are vertically arranged, and the other structures of the shear test mechanism 3 are horizontally arranged. Specifically:

[0098] Referring to Figure 8 and Figure 9 , the shear test mechanism 3 comprises a shear test fixed block 31, a third clamp 32, a translation mechanism 33, a shear test connecting rod 34, a third force sensor 35, a shear test connecting block 36, a shear test thrust bearing and a shear test transition block 38.

[0099] The shearing test fixed block 31 is located at the side of the frame 11. The third clamp 32 has clamp inner threads for screwing with the test product. The translation mechanism 33 is arranged on the shearing test fixed block 31, and has a translation end located at the side of the third clamp 32 and connected with the third force sensor 35. The shearing test connecting rod 34 is horizontally arranged, and has one end connected with the third clamp 32 and the other end connected with the shearing test connecting block 36. The shearing test connecting block 36 is connected with the shearing test transition block 38 through the shearing test thrust bearing, and the shearing test transition block 38 is located at the side of the third force sensor 35 and opposite to the third force sensor 35.

[0100] In use, part of the expansion bolt is arranged in the shearing test fixed block 31, and the other part is exposed from the pull-out test fixed block 21 and screwed with the third clamp 32 to fix the expansion bolt. The driving translation mechanism 33 is translated to the side away from the expansion bolt, and drives the third force sensor 35 to translate. The third force sensor 35 is abutted against the shearing test transition block 38 located at the side of the third force sensor 35. Due to the fixing of the expansion bolt, the third force sensor 35 can detect the force through the reaction force of the shearing test connecting rod 34 and the shearing test connecting block 36 on the shearing test transition block 38 to the side close to the expansion bolt, so as to achieve the shearing test purpose of the expansion bolt.

[0101] In an embodiment, referring to Figure 9 , the third clamp 32 comprises a third connecting block 321 and a third connecting sleeve 322.

[0102] The middle part of the third connecting block 321 is provided with a threaded hole with an open bottom. The middle part of the third connecting sleeve 322 is provided with a sleeve interface with an open bottom, and the third connecting sleeve 322 is sleeved on the outside of the third connecting block 321 through the sleeve interface.

[0103] Specifically, as Figure 9 shown, the middle part of the third connecting sleeve 322 is provided with a sleeve interface in communication with the upper and lower parts, and the third connecting block 321 is sleeved in the sleeve interface.

[0104] In an embodiment, the same as the pull-out test mechanism 2, the translation mechanism 33 of the shearing test mechanism 3 also adopts a hydraulic jack. The support part connected with the large piston in the hydraulic jack is used as the translation end, the small piston rod connected with the small piston in the hydraulic jack is connected with the first lifting end of the first lifting mechanism 14, and the first lifting mechanism 14 drives the support part to move horizontally.

[0105] In an embodiment, the same as the pull-out test mechanism 2, the shearing test connecting rod 34 of the shearing test mechanism 3 passes through the middle part of the large oil cylinder, the large piston and the support part in the hydraulic jack.

[0106] In an embodiment, the same as the tensile test mechanism 2, the shearing test mechanism 3 also comprises a pull rope displacement sensor, and a pull rope of the pull rope displacement sensor is connected to the translation end.

[0107] In an embodiment, referring to Figure 1 and Figure 2 , the tensile test mechanism 2 and the shearing test mechanism 3 share the small cylinder, the small piston and the small piston rod part of the hydraulic jack.

[0108] When the tensile test mechanism 2 is used, the hose can be connected to the tensile test mechanism 2, and when the shearing test mechanism 3 is used, the hose can be connected to the shearing test mechanism 3.

[0109] Of course, the tensile test mechanism 2 and the shearing test mechanism 3 can also have independent structures. The small piston rod of the tensile test mechanism 2 and the small piston rod of the shearing test mechanism 3 are arranged side by side and connected to the first lifting end.

[0110] In an embodiment, referring to Figure 1 and Figure 2 , the bolt test mechanism also comprises a rotatable hoist arm 4, the hoist arm 4 is installed on the frame 11, and the hoist arm 4 has a stroke range including at least one of the tensile test fixed block 21 and the shearing test fixed block 31.

[0111] The hoist arm 4 is used to facilitate the movement and transportation of the tensile test mechanism 2 and the shearing test mechanism 3.

[0112] The preferred embodiments of the utility model have been described in detail above, but it should be understood that after reading the above teaching content of the utility model, those skilled in the art can make various changes or modifications to the utility model. These equivalent forms also fall within the scope defined by the claims attached to the present application.

Claims

1. A bolt testing machine characterized by, The bolt test tester comprises a strength test mechanism, and the strength test mechanism comprises: a rack provided with a test table; a first upper clamp having a clamp insertion through hole for inserting a test product; a first lower clamp arranged on the test table below the first upper clamp and having clamp internal threads for threadedly connecting the test product; a first lifting mechanism arranged on the rack and having a first lifting end above the first upper clamp, the first lifting end being connected to the first upper clamp through a first force sensor.

2. The bolt testing machine of claim 1, wherein, The first upper clamp comprises: a first upper insertion block having an insertion through hole in communication with the upper and lower portions; a first upper connecting column connected to the first force sensor at the upper portion and provided with an upper insertion port at the lower portion, the first upper connecting column being insertedly connected to the first upper insertion block through the upper insertion port; and / or, the first lower clamp comprises: a first lower connecting block provided with a threaded hole with an open top portion in the middle portion; a first lower connecting column arranged on the test table at the bottom portion and provided with a lower insertion port at the upper portion, the first lower connecting column being insertedly connected to the first lower connecting block through the lower insertion port; and / or, the first lifting mechanism comprises: a driving motor; two ball screws vertically arranged on the test table, the bottom ends of the ball screws passing through the bottom portion of the test table and being connected to the driving motor through a transmission mechanism, the driving motor driving the two ball screws to rotate simultaneously; two screw nuts arranged on the corresponding ball screws, the screw nuts being driven by the ball screws to move up and down; a driving plate fixed to the two screw nuts and driven by the screw nuts to move up and down, the driving plate serving as the first lifting end of the first lifting mechanism; a top plate arranged above the driving plate and fixed to the top ends of the ball screws.

3. The bolt testing machine of claim 2, wherein, The first lifting mechanism further comprises: two guide columns arranged at the sides of the two ball screws, the bottom ends of the guide columns being fixed to the test table and the top ends of the guide columns passing through the driving plate and being fixed to the top plate.

4. The bolt testing machine of claim 1, wherein The bolt test tester further comprises a pull test mechanism, and the pull test mechanism comprises: a pull test fixed block arranged at the side of the rack; a second clamp having clamp internal threads for threadedly connecting the test product; a second lifting mechanism arranged on the pull test fixed block and having a second lifting end above the second clamp, the second lifting end being connected to a second force sensor; a pull test connecting rod having a vertical axial direction, the bottom end of the pull test connecting rod being connected to the second clamp and the top end of the pull test connecting rod being connected to a pull test connecting block, the pull test connecting block being connected to a pull test transition block through a pull test thrust bearing, the pull test transition block being arranged above the second force sensor.

5. The bolt testing machine of claim 4, wherein, The second clamp comprises: a second connecting block provided with a threaded hole with an open bottom portion in the middle portion; a second connecting column provided with a second insertion port at the lower portion, the second connecting column being insertedly connected to the second connecting block through the second insertion port; And / or, the second lifting mechanism adopts a hydraulic jack, a support part connected with a large piston in the hydraulic jack as the second lifting end, and a small piston rod connected with a small piston in the hydraulic jack connects the first lifting end of the first lifting mechanism, and the support part is driven to make lifting action by the first lifting mechanism; And / or, the pull-out test mechanism further comprises: A pull rope displacement sensor, whose pull rope is connected with the second lifting end.

6. The bolt testing machine of claim 5, wherein, The pull-out test connecting rod passes through the middle part of the large oil cylinder, the large piston and the support part in the hydraulic jack.

7. The bolt testing machine of claim 5, wherein, The bolt test testing machine further comprises a shear test mechanism, which comprises: A shear test fixed block located on the side of the rack; A third clamp having a clamp internal thread threadedly connected with a test product; A translation mechanism provided on the shear test fixed block and having a translation end located on the side of the third clamp, the translation end being connected with a third force sensor; A shear test connecting rod, which is horizontally arranged in the axial direction, one side of the shear test connecting rod being connected with the third clamp and the other side of the shear test connecting rod being connected with a shear test connecting block, the shear test connecting block being connected with a shear test transition block through a shear test thrust bearing, the shear test transition block being located on the side of the third force sensor and opposite to the third force sensor.

8. The bolt testing machine of claim 7, wherein, The third clamp comprises: A third connecting block, which is provided with a thread hole with an open bottom in the middle part; A third connecting sleeve, which is provided with a sleeve interface with an open bottom in the middle part, the third connecting sleeve being sleeved on the outside of the third connecting block through the sleeve interface; And / or, the translation mechanism adopts the same hydraulic jack as the second lifting mechanism; And / or, the shear test mechanism further comprises: A pull rope displacement sensor, whose pull rope is connected with the translation end.

9. The bolt testing machine according to claim 8, characterized in that: The pull-out test mechanism and the shear test mechanism share the small oil cylinder, the small piston and the small piston rod part in the hydraulic jack.

10. The bolt testing machine of any one of claims 4 to 9, wherein, The bolt test testing machine further comprises a rotatable hoist arm, the hoist arm being mounted on the rack, and the hoist arm having a stroke range including at least one of the pull-out test fixed block and the shear test fixed block.

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