CN112146994A - Bending test device - Google Patents

Abstract

The invention discloses a bending resistance test device, comprising: a bearing platform; a first clamping mechanism and a second clamping mechanism, which are arranged on the bearing platform at intervals, and the first clamping mechanism and the second clamping mechanism jointly clamp Hold the test sample; the pressure loading mechanism is set on the bearing platform, the pressure loading mechanism cooperates with the test sample to apply test pressure to the test sample, the relative relationship between the pressure loading mechanism, the first clamping mechanism and the second clamping mechanism Adjustable position. The technical solution of the present invention can be applied to tests in various situations, and is more flexible to use.

Description

Bending test device

technical field

The invention relates to the technical field of bending resistance test equipment, in particular to a bending resistance test device.

Background technique

In many fields, some components need to be tested to determine the mechanical properties of their materials when subjected to bending loads. For example, in the field of nuclear power, it is often necessary to perform bending tests on fuel elements such as fuel rods.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a bending resistance test device, which is suitable for tests in various situations and is more flexible to use.

The invention provides a bending resistance test device, comprising: a bearing platform; a first clamping mechanism and a second clamping mechanism, which are arranged on the bearing platform at intervals, and the first clamping mechanism and the second clamping mechanism jointly clamp Hold the test sample; the pressure loading mechanism is arranged on the bearing platform. The pressure loading mechanism cooperates with the test sample to apply test pressure to the test sample. The relative relationship between the pressure loading mechanism, the first clamping mechanism and the second clamping mechanism Position is adjustable.

Further, the pressure loading mechanism, the first clamping mechanism and the second clamping mechanism all have an adjusted state that is relatively slidable with the carrying platform and a locked state that is relatively fixed to the carrying platform.

Further, the bending resistance test device also includes a sliding component, the sliding component is matched with at least one of the pressure loading mechanism, the first clamping mechanism, the second clamping mechanism and the bearing platform, and the sliding component includes: a chute, at least one side There is a stopper on the groove wall, and a accommodating space is formed between the stopper and the groove bottom of the chute; the sliding block is movably arranged in the chute and partially inserted into the accommodating space; the locking structure is connected with the sliding block Through the locking structure, the slider can be moved toward the opening direction of the chute, and the part of the slider inserted into the accommodating space can be pressed against the stopper by moving, so that the pressure loading mechanism, the first part of the A clamping mechanism or a second clamping mechanism is in a locked state.

Further, the chute is arranged on the bearing platform through, and the sliding block is arranged on the bottom of the pressure loading mechanism, the first clamping mechanism and the second clamping mechanism.

Further, the first clamping mechanism includes a first supporting structure and a first clamping body disposed on the first supporting structure, the first clamping body has a first clamping channel, and the second clamping mechanism includes a second supporting structure and a second clamping body disposed on the second support structure, the second clamping body has a second clamping channel, wherein the height of the first clamping channel and the second clamping channel is the same so as to pass through the first clamping channel. The test specimens in the clamping channel and the second clamping channel are arranged in a horizontal state.

Further, at least one of the first clamping channel and the second clamping channel is adjustable in height.

Further, the first clamping main body includes: a cylindrical body, the inner space of which forms a first clamping channel; an elastic sleeve, which is at least partially embedded in the first clamping channel, and the elastic sleeve has the function of avoiding the test sample so that the test sample can pass through. into the open state of the first clamping channel and the clamped state in which the test sample is clamped so that the test sample is fixed in the first clamping channel.

Further, the elastic sleeve is axially movably arranged at the first end of the first clamping channel, the elastic sleeve includes a diameter reducing portion, the end portion of the diameter reducing portion is exposed to the first clamping channel, and the radial direction of the diameter reducing portion is exposed to the outside of the first clamping channel. The size gradually decreases along the direction from the first end to the second end of the first clamping channel, the sleeve wall of the reduced diameter portion has a plurality of grooves opened in the axial direction, and the plurality of grooves are arranged at intervals in the circumferential direction, and the diameter is reduced. There is an inwardly protruding clamping part on the inner wall of the first clamping channel, and an annular abutting top is arranged along the circumferential direction on the inner wall of the first clamping channel. It also includes: a gland, which is axially movably arranged on the end of the cylinder corresponding to the first end of the first clamping channel, the gland has an escape hole for avoiding the test sample, and the gland is pressed to the compression diameter The outer part is exposed to the part of the first clamping channel to push the elastic sleeve to move. With the movement of the elastic sleeve, the annular abutting top abuts the sleeve wall of the diameter-reducing part, so that the diameter-reducing part shrinks inward in the radial direction and clamps Clamp the test specimen at the top.

Further, the inner wall of the first clamping channel has a tapered surface, the tapered surface forms an annular abutting top, and the outer wall of the diameter reducing portion is tapered and fits with the tapered surface.

Further, the first clamping main body includes: a cylinder, the inner space of which forms a first clamping channel; an end stopper is arranged in the first clamping channel, and the end stopper has an end that is connected to the test sample. The end of the test sample is inserted into the limit groove.

Further, the end stopper is movable relative to the first clamping channel in the axial direction, the first end of the end stopper is exposed to the first clamping channel, and the limit groove is located at the second end of the end stopper. end, by moving the end stop against the test specimen.

Further, the first clamping main body includes: a cylindrical body, the inner space of which forms a first clamping channel; a first adjustment structure for adjusting the radial position of the test sample passing through the first clamping channel .

Further, the first adjustment structure includes a plurality of first telescopic pieces, each of which is radially and retractably inserted on the cylinder wall of the cylinder, and the part of each first telescopic piece located in the first clamping channel is connected to the cylinder wall. The side walls of the test sample are matched against the top, and the plurality of first telescopic members are evenly distributed along the circumferential direction.

Further, the first clamping body is slidable relative to the first supporting structure in the axial direction, and the second clamping body is fixedly arranged on the second supporting structure.

Further, the second clamping main body includes a second adjustment structure, and the second adjustment structure is used for adjusting the radial position of the test sample passing through the second clamping channel.

Further, the second clamping body further includes a clamping structure, the second adjusting structure and the clamping structure are arranged in the axial direction, the clamping structure has a clamping channel, and the second adjusting structure includes: a base sleeve, which is connected with the clamping structure. , the base sleeve has an adjustment channel, the adjustment channel is communicated with the clamping channel, the second clamping channel includes an adjustment channel and a clamping channel; a plurality of second telescopic parts, each of which is radially stretched and retractably inserted into the base sleeve On the side wall of the test sample, the part of each second telescopic piece located in the adjustment channel is abutted against the side wall of the test sample, and the plurality of second telescopic pieces are evenly distributed along the circumferential direction.

Further, the second support structure includes a support body and a height adjustment structure, and the height adjustment structure includes: a base, which is connected to the support body; a lifting member, which can be lifted and lowered on the base, and the lifting member is connected to the second clamping body. ; Lifting drive part, cooperates with the lifting part to drive the lifting part to rise and fall.

Further, the pressure loading mechanism includes: a pressure source; a fixed structure, which is fixedly connected with the test sample, and the pressure source applies a test pressure to the fixed structure and the test sample.

Further, the pressure loading mechanism further includes a pressure detection device, and the pressure detection device is used to detect the value of the test pressure.

Further, the pressure source includes: a power cylinder, the rod portion of which is connected with the fixed structure; and a servo valve, which is connected with the power cylinder.

Further, the fixing structure includes: a support having an accommodating channel; a plurality of third telescopic pieces, each of which is radially and telescopically inserted on the inner wall of the accommodating channel, and each third telescopic piece is located at the inner wall of the accommodating channel. Some of them are abutted against the side walls of the test sample, and a plurality of third telescopic members are evenly distributed along the circumferential direction.

By applying the technical solution of the present invention, the first clamping mechanism and the second clamping mechanism jointly clamp the test sample, and apply a test pressure to the test sample through the pressure loading mechanism. The relative positions of the pressure loading mechanism, the first clamping mechanism and the second clamping mechanism can be adjusted according to different situations such as the force position and force state required by the test sample, and different combinations can be obtained through different arrangements. Therefore, it is suitable for experiments in various situations, and the use is more flexible.

Description of drawings

Other objects and advantages of the present invention will be apparent from the following description of the present invention with reference to the accompanying drawings, and may assist in a comprehensive understanding of the present invention.

1 is a schematic structural diagram of a bending test device according to an embodiment of the present invention;

Fig. 2 is the structural representation of the bearing platform of the bending test device of Fig. 1;

Fig. 3 is the enlarged view of place A of the bending test device of Fig. 1;

4 is a schematic structural diagram of a first clamping mechanism of the bending test device of FIG. 1;

5 is a schematic structural diagram of a first support structure of the first clamping mechanism of FIG. 4;

FIG. 6 is a schematic structural diagram of a first clamping body of the first clamping mechanism of FIG. 4;

FIG. 7 is a schematic structural diagram of a second clamping mechanism of the bending test device of FIG. 1;

FIG. 8 is a schematic structural diagram of the second adjustment structure of the second clamping mechanism of FIG. 7; and

FIG. 9 is a schematic structural diagram of a pressure loading mechanism of the bending test device of FIG. 1 .

It should be noted that the accompanying drawings are not necessarily drawn to scale, but are only shown in a schematic manner that does not affect the reader's understanding.

Description of reference numbers:

10, bearing platform; 20, first clamping mechanism; 21, first support structure; 211, first base; 212, bracket; 213, bearing seat; 22, first clamping body; 221, cylinder body; 222, elastic sleeve; 223, gland; 2231, avoidance hole; 224, end stopper; 225, first telescopic piece; 30, second clamping mechanism; 31, second support structure; 311, support body; 312, Height adjustment structure; 3121, base; 3122, lifter; 3123, lift drive; 313, second base; 32, second clamping body; 321, second adjustment structure; 3211, base sleeve; 3212, adjustment channel ; 3213, the second telescopic part; 322, the clamping structure; 3221, the clamping channel; 40, the test sample; 50, the pressure loading mechanism; 51, the pressure source; 511, the power cylinder; 512, the servo valve; 52, the fixing Structure; 521, support; 5211, accommodating channel; 522, third telescopic piece; 53, pressure detection device; 54, third base; 61, chute; 611, stop part; 62, slider; 63, lock tight structure.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiment is one, but not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that, unless otherwise defined, the technical or scientific terms used in the present application shall have the usual meanings understood by those with ordinary skill in the art to which the present invention belongs. If descriptions such as "first" and "second" are involved in the whole text, the descriptions such as "first" and "second" are only used to distinguish similar objects, and should not be construed as indicating or implying their relative importance, sequence, etc. The order or the quantity of the indicated technical features is implicitly indicated, and it should be understood that the data described by "first", "second", etc. can be interchanged under appropriate circumstances. If "and/or" appears in the whole text, it means that it includes three parallel schemes. Taking "A and/or B" as an example, it includes scheme A, scheme B, or scheme that A and B satisfy at the same time. Furthermore, for ease of description, spatially relative terms, such as "above," "below," "top," "bottom," etc., may be used herein to describe only one device or feature as shown in the figure versus other devices or features. The spatial relationship of features should be understood to also encompass different orientations in use or operation in addition to the orientation shown in the figures.

The bending test apparatus of this embodiment is used to test the mechanical properties of the test sample 40 in the nuclear power field under bending load. The test sample 40 is specifically a fuel rod in a fuel assembly, that is, the test sample 40 is elongated. Of course, the specific type of the test sample 40 is not limited to this, and in other embodiments, the test sample can also be other samples that need to be subjected to a bending test.

It should be noted that the “axial” in the following detailed description may be regarded as the axial direction of the test sample 40 , and the “radial” may be regarded as the radial direction and the “circumferential direction” of the test sample 40 It can be considered as the circumferential direction of the test specimen 40 .

As shown in FIG. 1 , the bending test device of this embodiment includes a bearing platform 10 , a first clamping mechanism 20 , a second clamping mechanism 30 and a pressure loading mechanism 50 . The first clamping mechanism 20 , the second clamping mechanism 30 and the pressure loading mechanism 50 are arranged on the bearing platform 10 . The first clamping mechanism 20 and the second clamping mechanism 30 are spaced apart from each other and jointly clamp the test sample 40 . The platform 10 functions to carry the various components and test specimens 40 located thereon. The pressure loading mechanism 50 cooperates with the test sample 40 to apply a test pressure to the test sample 40 .

The relative positions of the pressure loading mechanism 50 , the first clamping mechanism 20 and the second clamping mechanism 30 are adjustable, and the specific positions of the pressure loading mechanism 50 , the first clamping mechanism 20 and the second clamping mechanism 30 can be determined according to the test The required force position and force state of the sample 40 can be adjusted according to different conditions.

For example, the first clamping mechanism 20 and the second clamping mechanism 30 are located at both ends of the test sample 40, respectively, and the pressure loading mechanism 50 is located in the middle of the test sample 40. This arrangement can test and measure the test sample 40 in the middle. Test data such as stress, strain, and flexural strength when both ends are fixed and the middle is subjected to bending load; alternatively, the first clamping mechanism 20 is located at one end of the test sample 40 (such as the tail of the fuel rod), and the second clamping mechanism 30 It is located in the middle part of the test sample 40, and the pressure loading mechanism 50 is located at the other end of the test sample 40 (such as the head of the fuel rod or the part close to the head), this arrangement can test and measure the test sample 40 at one end Test data such as stress, strain, and bending strength when the other end is fixed and the other end is subjected to bending load.

It can be seen from the above enumeration that the pressure loading mechanism 50, the first clamping mechanism 20, and the second clamping mechanism 30 of the bending test device can be combined in different ways through different arrangements, so that they are suitable for tests in various situations. It is more flexible and can accommodate test specimens 40 of various lengths.

As shown in FIG. 1 , in the bending resistance test device of the present embodiment, the pressure loading mechanism 50 , the first clamping mechanism 20 and the second clamping mechanism 30 all have an adjusted state that can slide relative to the bearing platform 10 and are in a relatively slidable state with the bearing platform 10 . The locked state of the platform 10 is relatively fixed. Specifically, the pressure loading mechanism 50 , the first clamping mechanism 20 , and the second clamping mechanism 30 can respectively slide relative to the bearing platform 10 in the axial direction, and lock after sliding to the required position. The above-mentioned method of position adjustment by sliding is convenient for operation, and locking after sliding to a desired position can facilitate the subsequent cooperation of the pressure loading mechanism 50 , the first clamping mechanism 20 , and the second clamping mechanism 30 with the test sample 40 .

The above-mentioned setting method of the pressure loading mechanism 50 , the first clamping mechanism 20 and the second clamping mechanism 30 is one of many methods for realizing position adjustment. For example, a plurality of clamping positions are set on the carrying platform, and the pressure loading mechanism, the first clamping mechanism and the second clamping mechanism select appropriate clamping positions for clamping according to the required positions.

As shown in FIG. 1 to FIG. 3 , in this embodiment, the bending resistance test device further includes a sliding component, and the sliding component includes a sliding groove 61 , a sliding block 62 and a locking structure 63 . The chute 61 is disposed on the carrying platform 10 through. A stopper portion 611 extending in the axial direction is provided on both side walls of the chute 61 , and an accommodation space is formed between the stopper portion 611 and the groove bottom of the chute 61 . Due to the arrangement of the stop parts 611 on both sides, the sliding groove 61 can be regarded as a T-shaped groove. The sliding block 62 is movably arranged in the sliding groove 61 , the longitudinal section of the sliding block 62 is also T-shaped, and the protruding parts of the sliding block 62 to both sides are inserted into the above-mentioned accommodating space. There are multiple sliding blocks 62 , which are respectively connected to the bottoms of the pressure loading mechanism 50 , the first clamping mechanism 20 and the second clamping mechanism 30 through the locking structure 63 . In this embodiment, a plurality of sliders 62 share one chute 61 , and the sliders 62 can be taken out from the end opening of the chute 61 , namely the pressure loading mechanism 50 , the first clamping mechanism 20 , and the second clamping mechanism 30 It can be removed from the carrying platform 10 , which facilitates the adjustment of the relative positions of the pressure loading mechanism 50 , the first clamping mechanism 20 , and the second clamping mechanism 30 .

By adjusting the locking structure 63 , the sliding block 62 can be moved toward the opening direction of the sliding slot 61 , and the part of the sliding block 62 inserted into the accommodating space can abut against the stopper 611 by moving. At this time, the part where the slider 62 is inserted into the accommodating space and the bottom of the components connecting the slider 62 (the pressure loading mechanism 50 , the first clamping mechanism 20 , the second clamping mechanism 30 ) jointly clamp the stopper 611 , so that the components connecting the slider 62 are in a locked state and cannot continue to slide. In this embodiment, the locking structure 63 includes a bolt and a nut. The bolt is connected to the top of the slider 62, and the bolt passes upward through the bottom of the component that needs to be connected to the slider 62, and then connects with the nut. When the position adjustment is required, by loosening the nut, a gap is created between the sliding block 62 and the sliding groove 61 and the stop part 611 , and the sliding block 62 can slide relative to the sliding groove 61 . When the position adjustment needs to be locked, the slider 62 is moved up by tightening the nut, and the stopper 611 is clamped together with the bottom of the component. At this time, the slider 62 and the chute 61 are relatively fixed, and the slider 62 can no longer operate. slide.

The above-mentioned sliding assembly realizes the switching of the pressure loading mechanism 50 , the first clamping mechanism 20 , and the second clamping mechanism 30 between the adjustment state and the locking state, and has a simple structure, easy processing and manufacturing, and easy operation.

It should be noted that the specific structures and arrangement positions of the chute 61 and the slider 62 are not limited to this. In other embodiments not shown in the drawings, the chute may also be provided with a stopper and a slider on one side of the slot wall. The part of the slide is inserted into the accommodating space formed between the stopper and the bottom of the chute; the chute can also be set at the bottom of the pressure loading mechanism, the first clamping mechanism, and the second clamping mechanism, and the slider is set at the bottom of the pressure loading mechanism, the first clamping mechanism, and the second clamping mechanism. On the bearing platform; if the pressure loading mechanism, the first clamping mechanism, and the second clamping mechanism are not arranged coaxially, there may be multiple chutes, and multiple chutes correspond to multiple sliders one-to-one or according to the Position selects which sliders share one chute and which sliders correspond to different chute. The locking structure 63 is also not limited to bolts and nuts, and in other embodiments, may be other structures capable of loosening and tightening the slider. In addition, the setting position of the above-mentioned sliding assembly is not limited to this, and in other embodiments, the sliding assembly may cooperate with one or both of the pressure loading mechanism, the first clamping mechanism, and the second clamping mechanism.

As shown in FIG. 4 and FIG. 5 , in the bending test device of the present embodiment, the first clamping mechanism 20 includes a first supporting structure 21 and a first clamping body 22 disposed on the first supporting structure 21 . The first clamping body 22 has a first clamping channel, and the test sample 40 is passed through the first clamping channel. The first support structure 21 includes a first base 211 and a bracket 212 , the bottom of the first base 211 is connected with the above-mentioned slider 62 , the bottom of the bracket 212 is connected to the first base 211 , and the first clamping body 22 is arranged on the bracket 212 top. The first base 211 and the bracket 212 are used to carry the first clamping body 22 and the test specimen 40, and provide a fulcrum for these components. The bracket 212 includes two spaced and parallel supporting plates, the supporting plates include a supporting main plate and a connecting Reinforcing plates on both edges of the main board.

As shown in FIGS. 4 and 6 , in this embodiment, the first clamping body 22 includes a cylindrical body 221 and an elastic sleeve 222 . The inner space of the cylindrical body 221 forms a first clamping channel. The elastic sleeve 222 is at least partially embedded in the first clamping channel. The elastic sleeve 222 has an open state that avoids the test piece 40 so that the test piece 40 can penetrate the first clamping channel and a clamp that clamps the test piece 40 to fix the test piece 40 in the first clamping channel state. When the test sample 40 needs to be clamped, first ensure that the elastic sleeve 222 is in an open state, and then insert the test sample 40 into the first clamping channel, and after the position of the test sample 40 is adjusted, the elastic sleeve 222 is The sleeve 222 is adjusted to a fastened state, so that the test sample 40 is fastened by the elastic sleeve 222 , thereby realizing the fastening of the test sample 40 .

Specifically, the elastic sleeve 222 is axially movably disposed at the first end of the first clamping channel. The elastic sleeve 222 includes a diameter-reduced portion, and the end of the diameter-reduced portion is exposed to the first clamping channel. The radial dimension of the reduced diameter portion gradually decreases along the direction from the first end to the second end of the first clamping channel. The sleeve wall of the reduced diameter portion has a plurality of linear grooves opened in the axial direction, and the plurality of grooves are arranged at intervals in the circumferential direction. The inner wall of the diameter-reduced portion has an inwardly protruding clamping portion. The inner wall of the first clamping channel is provided with an annular abutment portion arranged in the circumferential direction. The annular abutting top is fitted with the outer wall of the reduced diameter portion. The first clamping body 22 further includes a pressing cover 223, and the pressing cover 223 is screwed to the end of the cylindrical body 221 corresponding to the first end of the first clamping channel. The press cover 223 has an escape hole 2231 for avoiding the test sample 40 . When the gland 223 is not tightened, the elastic sleeve 222 is in the open state, the size of the inner channel of the reduced diameter portion is slightly larger than the radial size of the test sample 40, and the test sample 40 can smoothly pass through the escape hole 2231 into the first clamp hold the channel. When the pressing cover 223 is tightened, the pressing cover 223 is exposed to the part of the first clamping channel according to the compressed diameter portion, so as to push the elastic sleeve 222 to move. With the movement of the elastic sleeve 222, the ring-shaped abutting top abuts against the sleeve wall of the diameter-reducing portion. , so that the diameter-reducing portion shrinks radially inward, the clamping portion clamps the test sample 40, and the elastic sleeve 222 is in a clamped state at this time.

In this embodiment, the inner wall of the first clamping channel has a tapered surface, the tapered surface forms an annular abutment top, and the outer wall of the diameter reducing portion is tapered and fits with the tapered surface. As the elastic sleeve 222 moves toward the inside of the first clamping channel, the outer wall of the reduced diameter portion will slide along the conical surface, and due to the arrangement of the groove, the sleeve wall of the reduced diameter portion will elastically deform and radially inwardly When shrinking, the clamping part gradually approaches the clamping test sample 40 with the shrinkage of the sleeve wall of the diameter-reducing part.

It should be noted that the specific structure of the annular abutting top is not limited to this. In other embodiments, the annular abutting top can also be a convex ring arranged on the inner wall of the first clamping channel. The abutment of the outer wall can also realize the shrinkage of the diameter-reduced portion when moving. The connection method between the gland 223 and the cylinder body 221 is not limited to threaded connection. In other embodiments, the gland can also be connected in other ways, as long as the gland can be moved in the axial direction, for example, the gland can be directly sleeved On the outside of the end of the cylinder, the two can move relative to each other in the axial direction. When the gland is moved to press the reduced diameter portion in place, the gland and the cylinder are locked by means of snaps or the like.

In addition, the specific structure of the elastic sleeve 222 is not limited to this. In other embodiments, the elastic sleeve can be other structures that can realize the above functions. For example, the elastic sleeve can be made of elastic materials such as rubber, and the outer side of the elastic sleeve is connected to the first clamp. The inner wall of the channel is fixedly connected, and the inner side is used to fasten the test sample. On this basis, a structure that can stretch the elastic sleeve is set up. When the test sample needs to be worn, the elastic sleeve is opened. When the test sample position After adjustment, loosen the structure to restore the elastic sleeve to the state that can fasten the test sample.

As shown in FIG. 4 and FIG. 6 , in the bending test device of the present embodiment, the first clamping mechanism 20 is used to clamp the end of the test sample 40 . The first clamping body 22 further includes an end stopper 224, and the end stopper 224 is disposed in the first clamping channel. The end stopper 224 has a stopper groove that fits with the end of the test specimen 40 . The end of the test specimen 40 is inserted into the limiting groove. The end portion of the test sample 40 can be limited by the end limiting member 224 , and the limiting groove is more closely matched with the end portion of the test sample 40 . In this embodiment, the end stopper 224 is axially movable relative to the first clamping channel, the first end of the end stopper 224 is exposed to the first clamping channel, and the stopper groove is located at the end stopper. The second end of the positioning member 224 is pressed against the test sample 40 by moving the end limiting member 224 . Specifically, the outer wall of the end stopper 224 and the inner wall of the first clamping channel are connected by screw threads. After the test specimen 40 penetrates into the first clamping channel, manually rotate the end stopper 224 to adjust its position until the end stopper 224 abuts against the end of the test specimen 40, and the operation is more flexible.

Of course, the setting method and position of the above-mentioned end stopper 224 are not limited to this. In other embodiments not shown in the drawings, the end stopper can also be fixedly arranged in the first clamping channel. In this case, the It is necessary to move the test specimen to make the end of the test specimen abut against the end stopper.

As shown in FIG. 4 and FIG. 6 , in the bending test device of this embodiment, the first clamping main body 22 further includes a first adjustment structure, and the first adjustment structure is used to The radial position of the test sample 40 is adjusted, so as to further position the test sample 40, and the elastic sleeve 222 and the end limiter 224 are used to prevent the test sample 40 from moving casually, which is beneficial to the measurement of the test sample 40. stability.

In this embodiment, the first adjustment structure includes a plurality of first telescopic elements 225 . Each of the first telescopic elements 225 is inserted through the cylindrical wall of the cylindrical body 221 in a radially retractable manner. The portion of each first telescopic member 225 located in the first clamping channel is abutted against the side wall of the test sample 40 . The plurality of first telescopic elements 225 are evenly distributed along the circumferential direction. Specifically, each of the first telescopic elements 225 is connected with the cylinder wall of the cylinder body 221 in a threaded connection, and the expansion and contraction of the first telescopic element 225 can be controlled by rotating the first telescopic element 225 . By rotating the plurality of first telescopic members 225, the radial position of the test sample 40 can be adjusted, and finally the test sample 40 is coaxially disposed with the first clamping channel.

It should be noted that the ultimate purpose of adjusting the radial position of the test sample 40 is not limited to making it coaxial with the first clamping channel, but also to adjust the test sample 40 to other suitable locations. In addition, the first telescopic member 225 is not limited to being connected with the cylinder body 221 by screw thread. In other embodiments, the first telescopic member can also be connected in other ways, as long as it can ensure that the first telescopic member is radially retractable and can be adjusted Once in place, lock it in place. The specific structure of the first adjustment structure is not limited to this, and in other embodiments not shown in the drawings, the first adjustment structure may also be other structures capable of adjusting the radial position of the test sample.

As shown in FIG. 1 and FIG. 7 , in the bending test apparatus of this embodiment, there are two second clamping mechanisms 30 . The second clamping mechanism 30 includes a second supporting structure 31 and a second clamping body 32 disposed on the second supporting structure 31 . The second clamping body 32 has a second clamping channel, and the test sample 40 is passed through the second clamping channel. The second support structure 31 includes a support body 311 , a height adjustment structure 312 and a second base 313 . The bottom of the second base 313 is connected with the above-mentioned slider 62 , the bottom of the support body 311 is connected to the second base 313 , and the height adjustment structure 312 is arranged on the top of the support body 311 . The second base 313 is used to carry the supporting body 311 , the height adjustment structure 312 , the second clamping body 32 and other components. The support body 311 functions to increase the height.

The height adjustment structure 312 includes a base 3121 , a lifting member 3122 and a lifting driving member 3123 . The base 3121 is connected to the support body 311 . The base 3121 has an inner cavity, and the lifting member 3122 can be lifted and lowered through the inner cavity of the base 3121 , and the lifting member 3122 is connected with the second clamping body 32 . The lift driving member 3123 cooperates with the lift member 3122 to drive the lift member 3122 to rise and fall. In this embodiment, the lifting member 3122 is a lifting screw, the lifting driving member 3123 is a knurled nut sleeved on the lifting screw, the side wall of the base 3121 has a through hole, the through hole communicates with the inner cavity, and the knurling The nut is placed at the through hole and partially exposed to the base 3121, so as to facilitate manual operation. Rotating the knurled nut can adjust the height of the lifting screw, so as to adjust the height of the second clamping channel of the second clamping body 32 (that is, the installation height of the test sample 40), so as to cooperate with the first clamping mechanism 20 to make the first clamping mechanism 20. The height of the first clamping channel is the same as that of the second clamping channel, so that the test sample 40 is kept horizontal, which is beneficial to the test measurement accuracy of the test sample 40 .

It should be noted that the specific structure of the height adjustment structure 312 is not limited to this, and in other embodiments not shown in the figures, the height adjustment structure may be other structures capable of realizing height adjustment, for example, through the cooperation of the sliding rail and the sliding block The way. The specific structures of the lifting member 3122 and the lifting driving member 3123 are also not limited to this. In other embodiments not shown in the drawings, the lifting member may be a liftable structure of other forms, and the lifting driving member may be other capable of driving the lifting member. The moving structure, for example, the lift drive may be an air cylinder, the rod of which forms the lift. In addition, in this embodiment, the height of the second clamping channel of the second clamping mechanism 30 is adjustable through the height adjustment structure 312 , the purpose of which is to keep the test sample 40 horizontal. Of course, in other embodiments, the height of the first clamping channel of the first clamping mechanism can also be set to be adjustable, the height of the second clamping channel of the second clamping mechanism is fixed, or the first clamping mechanism The heights of the first clamping channel and the second clamping channel of the second clamping mechanism can be adjusted.

In the bending test device of this embodiment, the first clamping body 22 can slide relative to the first support structure 21 within a certain range in the axial direction, and the second clamping body 32 is fixedly arranged on the second supporting structure 31 . Since the end of the first end of the test sample 40 is fixed to the first clamping body 22 , and other positions such as the second end or the middle of the test sample 40 are fixed to the second clamping body 32 , the test sample 40 is The first end can slide relative to the first support structure 21 within a certain range in the axial direction. When the test is performed, if the test sample 40 is relatively fixed to the first support structure 21 and the second support structure 31, when pressure is applied to the test sample 40, the fixed parts on both sides of the test sample 40 will affect the test sample 40. 40 produces two axially opposite forces, which affect the bending of the test specimen 40 . In order to avoid the above situation, the first end of the test sample 40 is set to be slidable relative to the first support structure 21 .

Specifically, as shown in FIG. 4 , the top of the bracket 212 is provided with two spaced bearing seats 213 , the cylindrical body 221 is passed through the two bearing seats 213 , and a sliding bearing is provided between the cylindrical body 221 and the bearing seat 213 . . A limit step is provided on the outer wall of one end of the cylinder body 221 corresponding to the elastic sleeve 222 , and the limit step is located on the outer side of the bearing seat 213 . The sleeve 222 moves in the direction of the end stopper 224 .

As shown in FIG. 7 and FIG. 8 , in the bending test device of this embodiment, the second clamping body 32 includes a second adjusting structure 321 . The second adjustment structure 321 is used to adjust the radial position of the test sample 40 passing through the second clamping channel, so as to further position the test sample 40, which is beneficial to the stability of the test sample 40 in the test measurement. .

In this embodiment, the second clamping body 32 further includes a clamping structure 322 , and the second adjusting structure 321 and the clamping structure 322 are arranged in the axial direction. The clamping structure 322 has a clamping channel 3221 . Specifically, the clamping structure 322 includes upper and lower clamping blocks. After the two clamping blocks are joined together, a clamping channel 3221 is formed between them. The test sample 40 is inserted into the clamping channel 3221 .

The second adjusting structure 321 includes a base sleeve 3211 and a plurality of second telescopic elements 3213 . The base sleeve 3211 is connected to the clamping structure 322 . The base sleeve 3211 has an adjustment channel 3212 . The adjustment channel 3212 and the fixing channel 3221 communicate with each other and are coaxial. The second clamping channel includes an adjustment channel 3212 and a clamping channel 3221 . Each of the second telescopic elements 3213 is inserted through the side wall of the base sleeve 3211 flexibly in the radial direction. The portion of each second telescopic member 3213 located in the adjustment channel 3212 is abutted against the side wall of the test sample 40 . The plurality of second telescopic elements 3213 are evenly distributed along the circumferential direction. Specifically, each second telescopic element 3213 is threadedly connected to the side wall of the base sleeve 3211 , and the extension and retraction of the second telescopic element 3213 can be controlled by rotating the second telescopic element 3213 . By rotating the plurality of second telescopic members 3213 , the radial position of the test sample 40 can be adjusted, and finally the test sample 40 and the adjustment channel 3212 are coaxially arranged. In addition, the plurality of second telescopic members 3213 also play a role in fixing the test sample 40 .

It should be noted that, the ultimate purpose of adjusting the radial position of the test sample 40 is not limited to making it coaxial with the adjustment channel 3212, and it can also be adjusted to other appropriate positions according to the placement requirements of the test sample 40 (for example, keeping it horizontal). s position. In addition, the second telescopic element 3213 is not limited to be threadedly connected to the base sleeve 3211. In other embodiments, the second telescopic element can also be connected in other ways, as long as it can ensure that the second telescopic element is radially telescopic and can be adjusted Once in place, lock it in place. The specific structure of the second adjustment structure is not limited to this, and in other embodiments not shown in the drawings, the second adjustment structure may also be other structures capable of adjusting the radial position of the test sample.

As shown in FIG. 9 , in the bending test device of this embodiment, the pressure loading mechanism 50 includes a pressure source 51 , a fixing structure 52 and a third base 54 . The bottom of the third base 54 is connected to the above-mentioned slider 62 , the bottom of the pressure source 51 is connected to the third base 54 , the fixing structure 52 is connected to the pressure source 51 , the fixing structure 52 is fixedly connected to the test sample 40 , and the third base 54 is used to carry the pressure source 51 , the fixing structure 52 and the test sample 40 . The pressure source 51 applies a test pressure to the fixed structure 52 and the test specimen 40 . Specifically, the pressure source 51 includes a power cylinder 511 and a servo valve 512 . The top end of the rod (piston rod) of the power cylinder 511 is connected to the fixed structure 52 , and the servo valve 512 is connected to the power cylinder 511 . The pressure in the power cylinder 511 is controlled by the servo valve 512, so that the piston rod of the power cylinder 511 is extended or retracted with a certain pressure. When the piston rod of the power cylinder 511 moves, the pressure is transmitted to the test sample 40 through the fixing structure 52 , so as to control the bending degree of the test sample 40 .

In this embodiment, the power cylinder 511 is a hydraulic oil cylinder. Of course, the power cylinder 511 is not limited to a hydraulic oil cylinder, and in other embodiments, the power cylinder may also be a pneumatic cylinder. In addition, the specific form of the pressure source 51 is not limited thereto, and in other embodiments not shown in the drawings, the pressure source may also be other devices capable of providing pressure, such as other types of jacking devices.

As shown in FIG. 9 , in the bending test device of this embodiment, the fixing structure 52 includes a support 521 and a plurality of third telescopic members 522 . The holder 521 has a receiving channel 5211 . Each third telescopic piece 522 is radially and telescopically inserted on the inner wall of the accommodating channel 5211, the part of each third telescopic piece 522 located in the accommodating channel 5211 abuts against the side wall of the test sample 40, and a plurality of third telescopic pieces 522 The telescopic elements 522 are evenly distributed along the circumferential direction. Specifically, the third telescopic element 522 is connected with the support 521 by screw threads, and the extension and retraction of the third telescopic element 522 can be controlled by rotating the third telescopic element 522 . The test sample 40 can be fixed by rotating the plurality of third telescopic members 522 . In this embodiment, the upper part of the accommodating channel 5211 of the support 521 is open, and there are two third telescopic elements 522 , which are symmetrically arranged on the two side walls of the accommodating channel 5211 respectively.

It should be noted that, the third telescopic element 522 is not limited to be connected to the support 521 by screw thread, and in other embodiments, the third telescopic element can also be connected in other ways, as long as the third telescopic element can be ensured to be radially telescopic and It can be locked in this position after being adjusted in place. In addition, the specific structure of the fixing structure 52 is not limited to this. In other embodiments not shown in the drawings, the fixing structure may also be other structures that can fix the test sample. For example, the fixing structure may be a fixing sleeve, a fixing sleeve The inner hole is used to pass through the test sample and closely fit with the peripheral wall of the test sample.

As shown in FIG. 9 , in the bending test device of this embodiment, the pressure loading mechanism 50 further includes a pressure detection device 53 . The pressure detection device 53 is used to detect the value of the test pressure and accurately feed it back to the tester. Specifically, the pressure detection device 53 is a pressure sensor, and the pressure sensor is provided on the piston rod of the power cylinder 511 . Of course, the specific form of the pressure detection device 53 is not limited to this, and in other embodiments not shown in the figures, the pressure detection device may be other devices capable of detecting the test pressure.

For the embodiments of the present invention, it should also be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other to obtain new embodiments.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (21)

1. A bending resistance test device, characterized by comprising:

a load-bearing platform (10);

the first clamping mechanism (20) and the second clamping mechanism (30) are arranged on the bearing platform (10) at intervals, and the first clamping mechanism (20) and the second clamping mechanism (30) clamp the test sample piece (40) together;

the pressure loading mechanism (50) is arranged on the bearing platform (10), the pressure loading mechanism (50) is matched with the test sample piece (40) to apply test pressure to the test sample piece (40), and the relative positions of the pressure loading mechanism (50), the first clamping mechanism (20) and the second clamping mechanism (30) are adjustable.

2. The bending test apparatus of claim 1,

the pressure loading mechanism (50), the first clamping mechanism (20) and the second clamping mechanism (30) are all provided with an adjusting state which can slide relative to the bearing platform (10) and a locking state which is fixed relative to the bearing platform (10).

3. The bending test apparatus of claim 2,

the bending test device further comprises a sliding assembly, the sliding assembly is matched with at least one of the pressure loading mechanism (50), the first clamping mechanism (20), the second clamping mechanism (30) and the bearing platform (10), and the sliding assembly comprises:

the sliding groove (61) is provided with a stopping part (611) on at least one side groove wall, and an accommodating space is formed between the stopping part (611) and the groove bottom of the sliding groove (61);

the sliding block (62) is movably arranged in the sliding groove (61) and is partially inserted into the accommodating space;

the locking structure (63) is connected with the sliding block (62), the sliding block (62) can move towards the opening direction of the sliding groove (61) through the locking structure (63), and the part of the sliding block (62) inserted into the accommodating space is in abutting fit with the stopping part (611) through movement, so that the pressure loading mechanism (50), the first clamping mechanism (20) or the second clamping mechanism (30) matched with the sliding assembly is in the locking state.

4. The bending test apparatus of claim 3,

the sliding groove (61) is arranged on the bearing platform (10) in a penetrating mode, and the sliding block (62) is arranged at the bottoms of the pressure loading mechanism (50), the first clamping mechanism (20) and the second clamping mechanism (30).

5. The bending test apparatus of claim 1,

the first clamping mechanism (20) comprises a first supporting structure (21) and a first clamping body (22) arranged on the first supporting structure (21), the first clamping body (22) is provided with a first clamping channel,

the second clamping mechanism (30) comprises a second support structure (31) and a second clamping body (32) arranged on the second support structure (31), the second clamping body (32) having a second clamping channel,

the heights of the first clamping channel and the second clamping channel are the same, so that the test sample pieces (40) penetrating through the first clamping channel and the second clamping channel are arranged in a horizontal state.

6. The bending test apparatus of claim 5,

at least one of the first clamping channel and the second clamping channel is height adjustable.

7. The bending test apparatus of claim 5,

the first clamp body (22) comprises:

a cylinder (221) whose inner space forms the first clamping channel;

an elastic sleeve (222) at least partially embedded in the first clamping channel, the elastic sleeve (222) having an open state of retreating the test sample (40) to enable the test sample (40) to penetrate into the first clamping channel and a tightened state of tightening the test sample (40) to fix the test sample (40) in the first clamping channel.

8. The bending test apparatus of claim 7,

the elastic sleeve (222) is movably arranged at the first end of the first clamping channel along the axial direction, the elastic sleeve (222) comprises a reducing part, the end part of the reducing part is exposed out of the first clamping channel, the radial size of the reducing part is gradually reduced along the direction from the first end to the second end of the first clamping channel, a plurality of grooves which are axially arranged are formed in the sleeve wall of the reducing part, the grooves are circumferentially arranged at intervals, an inward-protruding clamping part is arranged on the inner wall of the reducing part, an annular abutting part which is circumferentially arranged is arranged on the inner wall of the first clamping channel, and the annular abutting part is attached to the outer wall of the reducing part,

the first clamp body (22) further comprises:

gland (223), along the movably setting of axial barrel (221) corresponding to the tip of the first end of first centre gripping passageway, gland (223) have and are used for dodging avoidance hole (2231) of experimental sample spare (40), through gland (223) press the reducing portion expose in the part of first centre gripping passageway, in order to promote elastic sleeve (222) remove, along with the removal of elastic sleeve (222), the annular is supported the top and is supported the jacket wall of reducing portion, so that the reducing portion is along radial inside shrink, clamping portion presss from both sides tightly experimental sample spare (40).

9. The bending test apparatus of claim 8,

the inner wall of the first clamping channel is provided with a conical surface, the conical surface forms the annular abutting part, and the outer wall of the reducing part is conical and is attached to the conical surface.

10. The bending test apparatus of claim 5 or 7,

the first clamp body (22) comprises:

a cylinder (221) whose inner space forms the first clamping channel;

the end limiting part (224) is arranged in the first clamping channel, the end limiting part (224) is provided with a limiting groove matched with the end of the test sample piece (40), and the end of the test sample piece (40) is inserted into the limiting groove.

11. The bending test apparatus of claim 10,

the end limiting piece (224) is movable relative to the first clamping channel along the axial direction, a first end of the end limiting piece (224) is exposed out of the first clamping channel, the limiting groove is located at a second end of the end limiting piece (224), and the end limiting piece (224) is moved to abut against the test sample piece (40).

12. The bending test apparatus of claim 5,

the first clamp body (22) comprises:

a cylinder (221) whose inner space forms the first clamping channel;

the first adjusting structure is used for adjusting the radial position of the test sample piece (40) penetrating into the first clamping channel.

13. The bending test apparatus of claim 12,

the first adjusting structure comprises a plurality of first telescopic parts (225), each first telescopic part (225) is inserted in the cylinder wall of the cylinder body (221) in a telescopic mode along the radial direction, the part, located in the first clamping channel, of each first telescopic part (225) is in abutting fit with the side wall of the test sample piece (40), and the first telescopic parts (225) are evenly distributed along the circumferential direction.

14. The bending test apparatus of claim 5,

the first clamping body (22) is axially slidable with respect to the first support structure (21), and the second clamping body (32) is fixedly arranged on the second support structure (31).

15. The bending test apparatus of claim 5,

the second clamping main body (32) comprises a second adjusting structure (321), and the second adjusting structure (321) is used for adjusting the radial position of the test sample piece (40) penetrating in the second clamping channel.

16. The bending test apparatus of claim 15,

the second clamping main body (32) further comprises a clamping structure (322), the second adjusting structure (321) and the clamping structure (322) are arranged along the axial direction, the clamping structure (322) is provided with a clamping channel (3221), and the second adjusting structure (321) comprises:

the base sleeve (3211) is connected with the clamping structure (322), the base sleeve (3211) is provided with an adjusting channel (3212), the adjusting channel (3212) is communicated with the clamping channel (3221), and the second clamping channel comprises the adjusting channel (3212) and the clamping channel (3221);

the plurality of second telescopic pieces (3213), each second telescopic piece (3213) is radially and telescopically inserted into the side wall of the base sleeve (3211), the part of each second telescopic piece (3213) located in the adjusting channel (3212) is in abutting fit with the side wall of the test sample piece (40), and the plurality of second telescopic pieces (3213) are circumferentially and uniformly distributed.

17. The bending test apparatus of claim 5,

the second support structure (31) comprises a support body (311) and a height adjustment structure (312), the height adjustment structure (312) comprising:

a base (3121) connected to the support body (311);

a lifting member (3122) liftably provided on the base (3121), the lifting member (3122) being connected with the second clamping body (32);

the lifting driving piece (3123) is matched with the lifting piece (3122) to drive the lifting piece (3122) to lift.

18. The bending test apparatus of claim 1,

the pressure loading mechanism (50) includes:

a pressure source (51);

a fixed structure (52) fixedly connected with the test sample piece (40), wherein the pressure source (51) applies the test pressure to the fixed structure (52) and the test sample piece (40).

19. The bending test apparatus of claim 18,

the pressure loading mechanism (50) further comprises a pressure detection device (53), and the pressure detection device (53) is used for detecting the numerical value of the test pressure.

20. The bending test apparatus of claim 18,

the pressure source (51) comprises:

a power cylinder (511), the rod part of the power cylinder (511) being connected with the fixed structure (52);

and a servo valve (512) connected to the power cylinder (511).

21. The bending test apparatus of claim 18,

the fixing structure (52) comprises:

a seat (521) having a receiving passage (5211);

the third telescopic pieces (522) are radially and telescopically inserted into the inner wall of the accommodating channel (5211), the part, located in the accommodating channel (5211), of each third telescopic piece (522) is in abutting fit with the side wall of the test sample piece (40), and the third telescopic pieces (522) are uniformly distributed in the circumferential direction.

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