Clamping test fixture assembly applied to ultimate flexural-tensile strain test

Abstract

The utility model relates to a clamping test fixture assembly applied to a limit flexural-tensile strain test, and relates to the field of concrete performance detection.The clamping test fixture assembly comprises a clamping bottom frame and a test pressure head, the clamping bottom frame comprises a mounting base and two supporting pieces, and an adjusting sliding groove is formed in the top face of the mounting base in the length direction; adjusting sliding blocks in one-to-one correspondence with the supporting pieces are installed in the adjusting sliding grooves in a sliding mode, adjusting inserting blocks are arranged at the tops of the adjusting sliding blocks, and adjusting inserting grooves allowing the adjusting inserting blocks to be inserted therein are formed in the bottoms of the supporting pieces. The mounting base is further provided with an adjusting mechanism for adjusting the distance between the two adjusting sliding blocks. The supporting device has the effect that the position of the supporting piece on the supporting bottom plate can be conveniently adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concrete performance detection, and particularly relates to a clamping test fixture assembly applied to a limit bending tensile strain test. BACKGROUND

[0002] The limit bending tensile strain test is a common detection method for concrete performance detection, which is used for detecting the failure load of a concrete test piece under pressure load, the corresponding maximum tensile strain and the lower edge fracture position of the test piece. In the limit bending tensile strain test, a universal testing machine and a clamping test fixture assembly are usually used. The universal testing machine is used to provide load, and the clamping test fixture assembly is used to clamp the concrete test piece so that the load borne by the concrete test piece meets the test requirements.

[0003] The clamping test fixture assembly comprises a clamping base frame and a test pressure head. The clamping base frame is installed on the detection table of the universal testing machine and comprises a mounting seat and two support pieces. The mounting seat is provided with an adjusting sliding groove along the length direction, the support pieces are provided with support sliding blocks which are slidingly installed in the adjusting sliding groove, the support pieces are provided with locking bolts and locking sliding blocks which are slidingly installed in the adjusting sliding groove and are installed on the locking bolts, and when it is needed to lock the support pieces on the clamping base frame, the locking sliding blocks are locked on the inner top surface of the adjusting sliding groove by rotating the locking bolts, so that the locking of the support pieces on the support base plate is realized.

[0004] According to the related art, the inventors consider that the two support pieces need to be separately adjusted in position, and the relative positions of the two support pieces and the horizontal distance from the support pieces to the test pressure head also need to be considered, so that the position adjustment process of the support pieces is relatively complicated. CONTENT OF THE UTILITY MODEL

[0005] In order to facilitate the adjustment of the position of the support pieces on the support base plate, the present application provides a clamping test fixture assembly applied to a limit bending tensile strain test.

[0006] The clamping test fixture assembly applied to a limit bending tensile strain test provided by the present application adopts the following technical scheme:

[0007] The clamping test fixture assembly applied to a limit bending tensile strain test comprises a clamping base frame and a test pressure head, the clamping base frame comprises a mounting seat and two support pieces, the top surface of the mounting seat is provided with an adjusting sliding groove along the length direction, the adjusting sliding groove is slidingly installed with an adjusting sliding block corresponding to each of the support pieces, the top of the adjusting sliding block is provided with an adjusting plug, and the bottom of the support piece is provided with an adjusting plug slot for the insertion of the adjusting plug; and the mounting seat is further provided with an adjusting mechanism for adjusting the spacing between the two adjusting sliding blocks.

[0008] By adopting the technical scheme, the distance between the two adjusting sliding blocks can be adjusted by the adjusting mechanism, so as to drive the distance between the two supporting pieces to be adjusted. The distance between the two supporting pieces is adjusted by the adjusting mechanism, which is convenient and has higher adjusting efficiency.

[0009] Optionally, the adjusting mechanism comprises a bidirectional screw rod rotatably installed in the adjusting sliding groove, a screw nut corresponding to each adjusting sliding block and installed on the corresponding adjusting sliding block, and a driving member for driving the bidirectional screw rod to rotate; the bidirectional screw rod has two threaded segments, and the threaded directions of the two threaded segments are oppositely arranged; the two screw nuts are arranged corresponding to the two threaded segments, and the screw nut is matched with the corresponding threaded segment.

[0010] By adopting the technical scheme, the adjusting mechanism adjusts the two adjusting sliding blocks by using the bidirectional screw rod, so that the synchronization rate and the adjusting accuracy of the two adjusting sliding blocks are relatively ideal.

[0011] Optionally, when the supporting piece is installed on the mounting seat, the supporting piece abuts against the top surface of the mounting seat, and there is a gap between the inner top surface of the adjusting slot and the top surface of the adjusting plug.

[0012] By adopting the technical scheme, when the supporting piece is installed on the mounting seat and bears the load of the concrete test block, the supporting piece will not transmit the load to the adjusting sliding block through the adjusting plug, so as to not apply pressure to the adjusting screw rod, thereby reducing the probability of damage of the adjusting screw rod during the test process, and helping to prolong the service life of the adjusting screw rod.

[0013] Optionally, the driving member is a rotary handle rotatably installed on the mounting seat and installed on the end of the bidirectional screw rod.

[0014] Optionally, the driving member is a driving motor installed on the mounting seat, and the output shaft of the driving motor is in transmission connection with the bidirectional screw rod.

[0015] Optionally, the supporting piece comprises a bottom plate part and an arc-shaped supporting part connected to the top of the bottom plate part, and the arc-shaped supporting part has an arc-shaped supporting surface.

[0016] By adopting the technical scheme, the arc-shaped supporting part supports the concrete test piece through the arc-shaped supporting surface, and the structure of the arc-shaped supporting part reduces the stress concentration of the arc-shaped supporting part, which helps to prolong the service life of the arc-shaped supporting part. Moreover, the arrangement of the arc-shaped supporting surface makes the concrete test piece and the arc-shaped supporting part in linear contact, so as to facilitate adjusting the position of the concrete test piece on the clamping base.

[0017] Optionally, the two support members are a first support member and a second support member, the first support member is located inside the second support member, and a limiting baffle is further arranged on the top of the bottom plate part of the first support member, and the limiting baffle is located on the side of the arc-shaped support part that faces away from the second support member.

[0018] By adopting the above technical solution, since the first support member is located inside the second support member, and the concrete test piece is placed on the clamping base from the outside, the limiting baffle arranged on the first support member can be used to abut against the inside of the concrete test piece, thereby reducing the distance of the concrete test piece from slipping off the inside of the clamping base during installation of the concrete test piece.

[0019] Optionally, the top of the arc-shaped support part is provided with a limiting groove for arranging the concrete test piece.

[0020] By adopting the above technical solution, the arc-shaped support part limits the left and right sides of the concrete test piece through the limiting groove, thereby reducing the possibility of the concrete test piece falling off from the two sides of the arc-shaped support part during installation of the concrete test piece.

[0021] In summary, the present application has at least one of the following beneficial technical effects:

[0022] The clamping test fixture assembly applied to the ultimate bending and tensile strain test adjusts the distance between the two support members by arranging two adjusting sliding blocks in the adjusting sliding groove and adjusting mechanism for driving the adjusting sliding blocks to move relative to each other, so that the adjusting mode is simple, convenient and has high adjusting efficiency.

[0023] The adjusting mechanism adjusts the two adjusting sliding blocks in the form of a bidirectional screw, so that the slip synchronization rate and adjusting accuracy of the two adjusting sliding blocks are relatively ideal.

[0024] By arranging the limiting baffle on the first support member and the limiting groove on the arc-shaped support part, the probability of the concrete test piece falling off from the clamping base during installation of the concrete test piece is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structure schematic view of the clamping test fixture assembly applied to the ultimate bending and tensile strain test in embodiment 1 and installed on a universal testing machine.

[0026] Figure 2 is a sectional structure schematic view of the clamping base in embodiment 1.

[0027] Figure 3 is a front view of the mounting seat in embodiment 1.

[0028] Figure 4 is Figure 2 is a local enlarged schematic view of A in FIG.

[0029] Figure 5 is Figure 2 is a local enlarged schematic view at B in Fig. 1.

[0030] Figure 6 is a structural schematic view of the support in Example 1.

[0031] Figure 7 is a structural schematic view of the test head in Example 1.

[0032] BRIEF DESCRIPTION OF DRAWINGS 1, clamping base; 11, mounting seat; 111, adjusting sliding groove; 1111, upper groove body; 1112, lower groove body; 112, adjusting sliding block; 1121, sliding part; 1122, adjusting plug; 113, mounting side plate; 1131, hand wheel through hole; 12, support; 1201, first support; 1202, second support; 121, bottom plate part; 122, arc-shaped support part; 1221, arc-shaped support surface; 1222, limiting groove; 123, plug-in part; 1231, adjusting plug groove; 124, limiting baffle; 131, bidirectional lead screw; 1311, threaded segment; 1312, driving end part; 132, lead screw nut; 133, lead screw support; 134, rotating hand wheel; 1341, rotating part; 1342, driving hole; 2, test head; 21, head plate; 22, mounting chuck; 23, arc-shaped pressure part; 231, arc-shaped pressure surface. DETAILED DESCRIPTION

[0033] The following will be described in detail in combination with the accompanying Figures 1-7 The application is described in further detail.

[0034] The embodiments of the application disclose a clamping test fixture assembly applied to a limit bending-tension strain test.

[0035] Example 1

[0036] With reference to Figure 1 The clamping test fixture assembly applied to the limit bending-tension strain test comprises a clamping base 1 and a test head 2. The clamping base 1 is installed on a detection table of a universal testing machine, and in the embodiment, mounting lugs are arranged on the side wall of the clamping base 1, and the mounting lugs are fixed on the detection table of the universal testing machine through bolts.

[0037] With reference to Figure 2 and Figure 3, the clamping base 1 comprises a mounting base 11 and two support members 12 detachably mounted on the mounting base 11. The top surface of the mounting base 11 is provided with an adjusting sliding groove 111 along the length direction, and the adjusting sliding groove penetrates through the front and back end surfaces of the mounting base 11. The adjusting sliding groove 111 is an inverted T-shaped sliding groove, and comprises an upper groove body 1111 and a lower groove body 1112. The width of the upper groove body 1111 is smaller than the width of the lower groove body 1112.

[0038] With reference to Figure 2 and Figure 4 , the mounting base 11 is slidably mounted with adjusting sliding blocks 112 in the adjusting sliding groove 111. The adjusting sliding block 112 comprises a sliding part 1121 slidably arranged in the lower groove body 1112 and an adjusting plug 1122 connected to the top of the sliding part 1121 and extending to the upper groove body 1111. An adjusting mechanism for adjusting the distance between the two adjusting sliding blocks 112 is also arranged in the adjusting sliding groove 111.

[0039] With reference to Figure 2 and Figure 4 , the adjusting mechanism comprises a bidirectional screw rod 131 rotatably mounted in the adjusting sliding groove 111, screw nuts 132 corresponding to the adjusting sliding blocks 112 and mounted on the corresponding adjusting sliding blocks 112, and a driving member for driving the bidirectional screw rod 131 to rotate. The adjusting sliding groove 111 is provided with two screw rod supports 133 on the bottom surface for supporting the bidirectional screw rod 131, and the bidirectional screw rod 131 is rotatably mounted on the two screw rod supports 133. The bidirectional screw rod 131 has two threaded segments 1311, and the threaded directions of the two threaded segments 1311 are oppositely arranged. The two screw nuts 132 are correspondingly arranged with the two threaded segments 1311 of the bidirectional screw rod 131, and the screw nuts 132 cooperate with the corresponding threaded segments 1311, so that when the bidirectional screw rod 131 rotates, the two adjusting sliding blocks 112 can move towards or away from each other. When the clamping base 1 is mounted to the detection table surface of the universal testing machine, the middle part of the bidirectional screw rod 131 is opposite to the middle part of the test pressure head 2.

[0040] With reference to Figure 2 and Figure 5 , in this embodiment, the driving member is a rotating hand wheel 134. The mounting base 11 is provided with a mounting side plate 113 at one end of the adjusting sliding groove 111. The mounting side plate 113 has a hand wheel through hole 1131 coaxially arranged with the bidirectional screw rod 131. The rotating hand wheel 134 has a rotating part 1341 rotatably arranged at the hand wheel through hole 1131, so that the rotating hand wheel 134 can be rotatably mounted on the mounting side plate 113. The rotating hand wheel 134 is provided with a driving hole 1342 on the end surface facing the bidirectional screw rod 131, and the bidirectional screw rod 131 has a driving end portion 1312 inserted into the driving hole 1342. The cross sections of the driving hole 1342 and the driving end portion 1312 are both square.

[0041] With reference to Figure 2 and Figure 4 , the support 12 comprises a bottom plate part 121, an arc-shaped support part 122 connected to the top of the bottom plate part 121, and a plug-in part 123 connected to the bottom of the bottom plate part 121. The plug-in part 123 can be inserted into the upper groove body 1111 of the adjusting sliding groove 111, and the plug-in part 123 is provided with an adjusting insertion groove 1231 for inserting the adjusting insertion block 1122. When the support 12 is installed on the mounting seat 11, the bottom plate part 121 abuts against the top surface of the mounting seat 11, the adjusting insertion block 1122 of the adjusting sliding block 112 is inserted into the adjusting insertion groove 1231 of the support 12, and there is a gap between the inner top surface of the adjusting insertion groove 1231 and the top surface of the adjusting insertion block 1122.

[0042] With reference to Figure 2 and Figure 6 , the top of the arc-shaped support part 122 has an arc-shaped support surface 1221. In order to reduce the concrete test piece from falling off from both sides of the arc-shaped support part 122, the top of the arc-shaped support part 122 is provided with a limiting groove 1222 for arranging the concrete test piece.

[0043] With reference to Figure 2 , the two supports 12 are respectively a first support 1201 and a second support 1202. Among them, the first support 1201 is located on the inner side of the second support 1202. The top of the bottom plate part 121 of the first support 1201 is further provided with a limiting baffle 124, which is located on the side of the arc-shaped support part 122 facing away from the second support 1202. When it is necessary to install the concrete test piece on the clamping base 1, the end of the concrete test piece can be limited by the limiting baffle 124, so as to reduce the falling off of the concrete test piece from the inner side of the clamping base 1 when placing the concrete test piece.

[0044] With reference to Figure 1 and Figure 7 , the test pressure head 2 is installed on the clamp of the universal testing machine and located above the clamping base 1. The test pressure head 2 is in the form of a double pressure head, and comprises a pressure head plate 21, a mounting chuck 22 arranged at the center of the top of the pressure head plate 21, and two arc-shaped pressure parts 23 arranged at the bottom of the pressure head plate 21. Among them, the two arc-shaped pressure parts 23 are horizontally and spaced apart, and the bottom of the arc-shaped pressure part 23 has an arc-shaped pressure surface 231.

[0045] The implementation principle of the clamping test fixture assembly applied to the ultimate bending tensile strain test in the embodiment of the application is as follows: before the ultimate bending tensile strain test is performed, the spacing of the two support pieces 12 is adjusted according to the model of the concrete test piece, the support positions of the support pieces 12 on the bottom surface of the concrete test piece are marked, the positions corresponding to the arc-shaped pressure part 23 of the test pressure head 2 on the bottom surface of the concrete test piece are marked, and the strain gauges are installed on the marked positions on the bottom surface of the concrete test piece corresponding to the arc-shaped pressure part 23; then, the concrete test piece is placed on the clamping base 1 so that the marks correspond to the positions of the support pieces 12, and in the installation process, the inner side of the concrete test piece can first abut against the limiting baffle 124, and then the concrete test piece is pulled, so as to reduce the falling of the concrete test piece from the inner side of the clamping base 1 in the installation process; then, the universal testing machine is started to detect the ultimate bending tensile strain of the concrete test piece.

[0046] Embodiment 2

[0047] The clamping test fixture assembly applied to the ultimate bending tensile strain test in the embodiment of the application is consistent with the clamping test fixture assembly applied to the ultimate bending tensile strain test in the embodiment 1 of the application except that the driving piece is inconsistent with the driving piece in the embodiment 1.

[0048] The driving piece in the embodiment is a driving motor installed in the adjusting sliding groove 111 of the mounting seat 11, and the output shaft of the driving motor is connected and fixed with the end of the bidirectional lead screw 131 through a shaft coupling.

[0049] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so: all equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A clamping test fixture assembly for use in extreme bending-tension strain tests, comprising a clamping base (1) and a test indenter (2), said clamping base (1) comprising a mounting seat (11) and two supports (12), characterized in that, The top surface of the mounting base (11) is provided with an adjusting sliding groove (111) in the length direction, an adjusting sliding block (112) corresponding to the support (12) is slidingly installed in the adjusting sliding groove (111), the top of the adjusting sliding block (112) is provided with an adjusting plug (1122), and the bottom of the support (12) is provided with an adjusting plug groove (1231) for inserting the adjusting plug (1122); the mounting base (11) is further provided with an adjusting mechanism for adjusting the spacing between the two adjusting sliding blocks (112).

2. The clamped test fixture assembly for use in the extreme bend-tension strain test of claim 1, wherein, The adjusting mechanism comprises a bidirectional screw rod (131) rotatably installed in the adjusting sliding groove (111), a screw rod nut (132) corresponding to the adjusting sliding block (112) and installed on the corresponding adjusting sliding block (112), and a driving member for driving the bidirectional screw rod (131) to rotate; the bidirectional screw rod (131) has two threaded segments (1311) with opposite thread directions, and the two screw rod nuts (132) are correspondingly arranged on the two threaded segments (1311), and the screw rod nut (132) cooperates with the corresponding threaded segment (1311).

3. The clamped test fixture assembly for use in the extreme bend- tension strain test of claim 2, wherein, When the support (12) is installed on the mounting base (11), the support (12) abuts against the top surface of the mounting base (11), and there is a gap between the inner top surface of the adjusting plug groove (1231) and the top surface of the adjusting plug (1122).

4. The clamped test fixture assembly for use in the extreme bend-tension strain test of claim 2, wherein, The driving member is a rotary handle (134) rotatably installed on the mounting base (11) and installed on the end of the bidirectional screw rod (131).

5. The clamped test fixture assembly for use in the extreme bend-tension strain test of claim 2, wherein, The driving member is a driving motor rotatably installed on the mounting base (11), and the output shaft of the driving motor is in transmission connection with the bidirectional screw rod (131).

6. The clamped test fixture assembly for use in the extreme bend-tension strain test of claim 1, wherein, The support (12) comprises a bottom plate portion (121) and an arc-shaped support portion (122) connected to the top of the bottom plate portion (121), and the arc-shaped support portion (122) has an arc-shaped support surface (1221).

7. The clamped test fixture assembly for use in the extreme bend- tension strain test of claim 6, wherein, The two supports (12) are a first support (1201) and a second support (1202), respectively, the first support (1201) is located on the inner side of the second support (1202), and the top of the bottom plate portion (121) of the first support (1201) is further provided with a limiting baffle (124) located on the side of the arc-shaped support portion (122) facing away from the second support (1202).

8. The clamped test fixture assembly for use in the extreme bend-tension strain test of claim 6, wherein, The top of the arc-shaped support portion (122) is provided with a limiting groove (1222) for arranging a concrete test piece.

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