Round rod three-point bending test tool

Abstract

The utility model provides a round bar three-point bending test tool, which comprises a mounting seat, a support block and an upper pressure head, two moving seats are symmetrically and slidably arranged at the top of the mounting seat, each moving seat is provided with a locking piece for locking the moving seat and the mounting seat, the top of the support block is provided with an accommodating groove, the bottom of the support block is provided with a clamping groove, and the upper pressure head is arranged in the accommodating groove. The top of each moving seat is provided with a protruding block clamped with the supporting block, the top of the upper pressing head is connected with a connecting piece, the upper pressing head is connected with the output end of the mechanical testing machine through the connecting piece and located above the two moving seats, the bottom of the upper pressing head is detachably connected with a lower pressing head, and the bottom of the lower pressing head is provided with a pressing groove matched with a round bar. The problem that in the prior art, when three-point bending experiments are carried out on round bar test pieces with different diameters, the same tool is used for testing the round bar test pieces, and consequently the precision of a detection result is not accurate enough is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to three point bending test technical field especially relates to a round bar three point bending test frock. BACKGROUND

[0002] The pultrusion round bar composite material takes continuous fiber (such as glass fiber) as reinforcing body, high-performance resin (such as polyurethane resin, epoxy resin etc.) as matrix, is made through pultrusion forming process, in the forming process, fiber is uniformly soaked by resin, is continuously pulled into heating mould through traction device, completes solidification, thereby obtains the round bar of specific diameter, and the round bar produced is needed to carry out three point bending test by the examiner to evaluate its bending strength, rigidity and other mechanical properties, in the experiment, the round bar test piece is supported through the support frock set at the output end of the mechanical testing machine directly below, and the loading system of the mechanical testing machine is used to apply load to the round bar test piece below, and the data collected in the deformation process of the round bar test piece is displayed on the display screen after being processed by the measuring system of the mechanical testing machine, so that the tester records to provide experimental basis for subsequent process improvement.

[0003] The three point bending test frock currently exists when supporting the round bar test piece of different diameters, and the same support clamp is used for clamping and supporting the round bar test piece of different diameters, although the support of the round bar test piece is also realized, but the mismatched clamp can affect the test precision of the small round bar sample, and if the test precision is to be met, more support frocks need to be configured, which increases the cost. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the prior art, the utility model provides a round bar three point bending test frock, which solves the problem that the same frock is used for testing the round bar test piece when the three point bending test is carried out on the round bar test piece of different diameters in the prior art, resulting in inaccurate detection results.

[0005] According to the embodiment of the utility model, a round bar three point bending test frock, which includes mounting seat, support block and upper pressure head, the top of mounting seat is symmetrically and slidably provided with two moving seats, a locking piece is further arranged on each moving seat to lock the moving seat with the mounting seat, a containing groove is arranged on the top of the support block, a clamping groove is arranged on the bottom of the support block, the top of each moving seat is provided with a protruding block clamped with the support block, the top of the upper pressure head is connected with a connecting piece, the upper pressure head is connected with the output end of the mechanical testing machine through the connecting piece and located above the two moving seats, the bottom of the upper pressure head is detachably connected with a lower pressure head, and a pressing groove matched with the round bar is arranged on the bottom of the lower pressure head.

[0006] Compared with the prior art, the utility model have following beneficial effect: through adopt locking piece to the release and locking of mobile seat adjust two mobile seat's relative position, because upper pressure head and lower pressure head detachable setting, support block and convex block also detachable, experimental personnel according to need replace lower pressure head and support block, the both ends of the round bar to be tested are respectively erected in the containing groove on the top of two support blocks, the size of the containing groove and the round bar is more adaptive, when lower pressure head moves down and tests the round bar, the pressing groove on the bottom of lower pressure head is also adaptive with the diameter of the round bar, thereby guarantee the accuracy of three -point bending test result to the round bar, provide real accurate data support for subsequent process improvement.

[0007] Further, the bottom of the upper pressure head is provided with a threaded hole, and the lower pressure head is provided with a counter-sunk hole corresponding to the threaded hole.

[0008] Further, the locking piece includes a locking bolt, the mounting seat is provided with a T-shaped slot, the bottom of each mobile seat is provided with a sliding block, the mobile seat is slidably connected with the T-shaped slot of the mounting seat through the sliding block, each mobile seat is provided with a through hole, and one end of the locking bolt is vertically inserted into the through hole and extends into the T-shaped slot and is threadedly connected with a fastening block.

[0009] Further, the top of the opposite side of the two mobile seats is provided with an empty step.

[0010] Further, the utility model also includes a limiting ring, the connecting piece is cylindrical, the connecting piece is provided with a bolt hole, the outer wall of the connecting piece is provided with a thread, and the limiting ring is screwed with the thread of the outer wall of the connecting piece.

[0011] Further, the top of each mobile seat is provided with a sliding slot, each sliding slot is slidably provided with a limiting plate, and each mobile seat is further provided with a driving assembly for driving the limiting plate to move along the sliding slot.

[0012] Further, the driving assembly includes a lead screw, the lead screw is horizontally and rotatably arranged in the sliding slot, the lead screw is threadedly connected with the limiting plate, and one end of the lead screw is provided with a handle after penetrating out of the sliding slot.

[0013] Further, each limiting plate is provided with an installation slot, and each installation slot is detachably provided with a baffle. ACCURACY

[0014] Figure 1 It is the overall structure schematic view of the utility model embodiment.

[0015] Figure 2 It is the front view of the utility model embodiment.

[0016] Figure 3 It is the side view of the utility model embodiment.

[0017] Figure 4The upper pressing head and the lower pressing head are connected according to the embodiment of the utility model.

[0018] Figure 5 The utility model discloses an installation schematic diagram of the limiting plate.

[0019] In the above drawing: 1, mounting seat, 2, moving seat, 3, support block, 4, convex block, 5, upper pressing head, 6, connecting piece, 7, lower pressing head, 8, pressing groove, 9, counterbore, 10, locking bolt, 11, fastening block, 12, step, 13, limiting ring, 14, limiting plate, 15, screw rod, 16, baffle. Specific implementation

[0020] The technical scheme in the utility model is further explained below in connection with the drawings and the embodiments.

[0021] As Figures 1 to 3 The utility model discloses a round bar three point bending test frock, including mounting seat 1, support block 3 and upper pressing head 5, the top symmetry of mounting seat 1 is equipped with two moving seat 2 and slides, still be equipped with the locking piece that it is locked with mounting seat 1 on every moving seat 2, the top of support block 3 is equipped with the accommodating groove, the bottom of support block 3 is equipped with the clamping groove, the top of every moving seat 2 is equipped with the convex block 4 of clamping with support block 3, the top of upper pressing head 5 is connected with connecting piece 6, and upper pressing head 5 is connected with the output end of mechanical testing machine through connecting piece 6 and is located in the top of two moving seat 2, and the bottom of upper pressing head 5 is detachably connected with lower pressing head 7, and the bottom of lower pressing head 7 is equipped with the pressing groove 8 of adapting with round bar.In this embodiment, moving seat 2 is L-shaped, and convex block 4 is integrally formed with moving seat 2.As frock, mounting seat 1 is fixed on the machine table of mechanical testing machine, when carrying out three point bending test, first through locking piece to release moving seat 2, according to the length of the round bar to be tested and test demand, adjust the interval between two moving seat 2, after adjusting, again through locking piece to fix moving seat 2 on mounting seat 1, then the two ends of the round bar to be tested are placed in the accommodating groove of two support blocks 3, start mechanical testing machine, and the output end of mechanical testing machine drives upper pressing head 5 to move down and load on the round bar, reach the purpose of three point bending test, since lower pressing head 7 and upper pressing head 5 are detachably connected, and support block 3 and the convex block 4 on moving seat 2 are clamped, test personnel can replace lower pressing head 7 and support block 3 according to the diameter of the round bar to be tested, so as to change the size of the accommodating groove on support block 3 and the bottom pressing groove 8 of lower pressing head 7, by replacing lower pressing head 7 and support block 3 more suitable for the round bar to be tested, reduce the influence of external factors on test results, make test results more accurate, and be convenient for subsequent improvement of production process.

[0022] As Figure 3 And Figure 4As shown, further, the bottom of the upper pressing head 5 is provided with a threaded hole, and the lower pressing head 7 is provided with a counter-sunk hole 9 corresponding to the threaded hole. Specifically, the lower pressing head 7 is connected with the upper pressing head 5 by bolts. In the embodiment, the bottom of the upper pressing head 5 is provided with two threaded holes, and the lower pressing head 7 is provided with two counter-sunk holes 9 corresponding to the threaded holes. When connected, the bolts are inserted into the counter-sunk holes 9 and screwed with the threaded holes of the upper pressing head 5. Preferably, the bolts are hexagonal bolts.

[0023] As shown in Figures 1 to 3 As shown, further, the locking member includes a locking bolt 10, and the mounting seat 1 is provided with a T-shaped slot. The bottom of each moving seat 2 is provided with a sliding block, and the moving seat 2 is slidably connected with the T-shaped slot of the mounting seat 1 through the sliding block. Each moving seat 2 is provided with a through hole, and one end of the locking bolt 10 is vertically inserted into the through hole and extends into the T-shaped slot and is threadedly connected with a fastening block 11. The sliding block is integrally formed with the moving seat 2, and the fastening block 11 is located in the T-shaped slot and has the same width as the T-shaped slot. By rotating the locking bolt 10, the fastening block 11 is moved upward or downward. When the fastening block 11 is moved upward, the top of the fastening block 11 is tightly attached to the slot wall of the T-shaped slot, thereby locking the moving seat 2 at the position. Preferably, a gasket is arranged between the locking bolt 10 and the moving seat 2.

[0024] As shown in Figure 1 As shown in Figure 2 As shown, further, the top of the opposite side of each moving seat 2 is provided with an empty step 12. In the embodiment, the step 12 is formed by the top of the moving seat 2 and the protruding block 4. Since the lower pressing head 7 needs to be moved downward by a distance exceeding the horizontal height of the round bar during the test of the round bar, the empty step 12 is arranged to ensure that the lower pressing head 7 will not hit the moving seat 2 when the lower pressing head 7 is moved to the predetermined distance during the test of the round bar with a very small size.

[0025] As shown in Figures 1 to 3 As shown, further, the connecting member 6 is cylindrical and is provided with a bolt hole and a thread on the outer wall. The limiting ring 13 is threadedly connected with the thread of the connecting member 6. In the embodiment, a connecting sleeve is arranged on the mechanical testing machine, and the two ends of the connecting sleeve are also provided with through holes. When the connecting member 6 is connected with the mechanical testing machine, the connecting member 6 is first inserted into the connecting sleeve, the loading beam of the mechanical testing machine is horizontally inserted through the through holes of the connecting sleeve and the bolt hole of the connecting member 6, and then the limiting ring 13 is rotated to move upward and abut against the bottom of the connecting sleeve, thereby limiting the shaking of the upper pressing head 5 and preventing the loading beam from being taken out at any time, thereby preventing the safety hazard caused by the misoperation.

[0026] As shown in Figure 1 As shown in Figure 5As shown in the drawings, further, the top of each mobile seat 2 is provided with a sliding slot, and a limiting plate 14 is slidably arranged on each sliding slot. Each mobile seat 2 is further provided with a driving assembly for driving the limiting plate 14 to move along the sliding slot. The limiting plate 14 is driven to move by the driving assembly, the relative distance between the limiting plate 14 of each mobile seat 2 and the support block 3 is adjusted, and then the distance of the two ends of the round bar extending out of the accommodating groove is controlled, so as to ensure that the position of the lower pressing head 7 is the middle position of the round bar, and the accuracy of the required test result is further ensured. Preferably, the mounting seat 1 and the mobile seat 2 are both provided with a scale, the scale on the mounting seat 1 is used to measure the distance between the two mobile seats 2, and the scales on the mobile seats 2 are used to measure the relative distance between the limiting plate 14 and the support block 3.

[0027] As shown in the drawings, Figure 1 and Figure 5 Further, each driving assembly comprises a screw rod 15, the screw rod 15 is horizontally and rotatably arranged in the sliding slot, the screw rod 15 is threadedly connected with the limiting plate 14, and one end of the screw rod 15 is provided with a handle after extending out of the sliding slot. When the distance of the limiting plate 14 is adjusted, the handle is rotated, the handle drives the screw rod 15 to rotate, the screw rod 15 drives the limiting plate 14 threadedly connected with the screw rod 15 to move along the sliding slot, so as to achieve the purpose of adjusting the distance of the limiting plate 14.

[0028] As shown in the drawings, Figure 1 and Figure 5 Further, each limiting plate 14 is provided with an installation slot, and a baffle 16 is detachably arranged in each installation slot. In the embodiment, the baffle 16 is provided with a clamping block capable of being clamped into the installation slot, and the baffle 16 is detachably arranged with the limiting plate 14. When a longer round bar is tested, for example, the edge area of a longer round bar is tested, at this time, the baffle 16 can be detached, and the end of the round bar extending out of the support block 3 will not interfere with the baffle 16. The detachable arrangement of the baffle improves the versatility of the tooling and adapts to different test requirements.

[0029] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A round bar three point bend test fixture characterized by, The utility model relates to a mechanical test machine upper pressure head structure, including: Mounting seat (1), mounting seat (1) top symmetry and two mobile seat (2) are provided with slidingly, each mobile seat (2) is also provided with locking piece that it is locked with mounting seat (1) on top; Supporting block (3), the top of supporting block (3) is provided with accommodating groove, the bottom of supporting block (3) is provided with clamping groove, the top of each mobile seat (2) is provided with with the protruding block (4) of clamping of supporting block (3); Upper pressure head (5), the top of upper pressure head (5) is connected with connecting piece (6), and upper pressure head (5) is connected with the output end of mechanics testing machine through connecting piece (6) and is located above two mobile seat (2), and the bottom of upper pressure head (5) is detachably connected with lower pressure head (7), and the bottom of lower pressure head (7) is provided with with the pressure groove (8) of round bar adaptation.

2. A round bar three point bend test fixture as claimed in claim 1, characterised in that: The bottom of upper pressure head (5) is provided with threaded hole, and the bottom of lower pressure head (7) is provided with with the counterbore hole (9) corresponding to threaded hole.

3. A round bar three point bend test fixture as claimed in claim 1, wherein: Locking piece includes locking bolt (10), mounting seat (1) is provided with T-shaped slot, the bottom of each mobile seat (2) is provided with sliding block, and mobile seat (2) is slidably connected with the T-shaped slot of mounting seat (1) through sliding block, and each mobile seat (2) is provided with through hole, and one end of locking bolt (10) is vertically downward into through hole and is connected with fastening block (11) after threaded connection in T-shaped slot.

4. A round bar three point bend test fixture as claimed in claim 1, wherein: The top of the opposite side of two mobile seat (2) is provided with with the emptying step (12) of avoiding.

5. A round bar three point bend test fixture as claimed in claim 1, wherein: Still including limiting ring (13), connecting piece (6) is cylindrical, and the plug hole is set up in connecting piece (6), and the thread is set up on the circumferential outer wall of connecting piece (6), and limiting ring (13) is screwed with the thread of the circumferential outer wall of connecting piece (6).

6. A round bar three point bend test fixture as claimed in claim 1, wherein: The top of each mobile seat (2) is provided with with the sliding slot, and each sliding slot is slidably provided with limiting plate (14), and each mobile seat (2) is also provided with drive assembly that drives limiting plate (14) moves along sliding slot.

7. A round bar three point bend test fixture as claimed in claim 6 wherein: Each drive assembly includes screw rod (15), and screw rod (15) is horizontally and rotatably arranged in sliding slot, and screw rod (15) is threadedly connected with limiting plate (14), and one end of screw rod (15) is provided with handle after penetrating out of sliding slot.

8. A round bar three point bend test fixture as claimed in claim 7, characterised in that: Each limiting plate (14) is provided with mounting slot, and each mounting slot is detachably provided with baffle (16).

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