CN115753443A - Tool for thermal extension test and thermal extension test device - Google Patents
Tool for thermal extension test and thermal extension test device Download PDFInfo
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- CN115753443A CN115753443A CN202211550999.8A CN202211550999A CN115753443A CN 115753443 A CN115753443 A CN 115753443A CN 202211550999 A CN202211550999 A CN 202211550999A CN 115753443 A CN115753443 A CN 115753443A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to the technical field of thermal extension test devices, in particular to a tooling for a thermal extension test and a thermal extension test device, wherein the tooling comprises a tooling frame, a weight assembly and a release mechanism, the tooling frame comprises a beam, the release mechanism is arranged on the beam and is used for releasably clamping the upper end of a dumbbell shape, the weight assembly comprises a main body part and two hanging rods which are respectively connected with the two sides of the main body part, and the gravity center of the weight assembly is positioned above the hanging rods; brackets are arranged on two sides of the weight component, the brackets on the two sides of the weight component are arranged at intervals relatively to form a space for the main body part to fall freely, the brackets comprise a hanging surface for hanging the hanging rod after the weight component falls off, and the hanging rod can rotate relative to the hanging surface. The tool provided by the invention is applied to a thermal extension test, can automatically release the weight component on the premise of not opening the oven, and can prevent dumbbell samples from being adhered to influence the test process.
Description
Technical Field
The invention relates to the technical field of thermal extension test devices, in particular to a tool for a thermal extension test and a thermal extension test device.
Background
In the hot extension test of cable, its main process makes a dumbbell appearance that replaces the cable product earlier, then utilizes frock clamping dumbbell appearance, specifically for fixing dumbbell appearance upper end, the lower extreme hangs the weight in order to be as the load to put into the oven with its whole and carry out the hot extension test under the set temperature, when the time length of setting expires, lift off the weight, obtain the testing result through the interval change between two gauge length lines of survey on the dumbbell appearance.
In this in-process, lift off the traditional operation of weight and do, utilize tools such as scissors to cut the position that dumbbell appearance is close to the lower extreme for the weight drops from dumbbell appearance, and the oven is opened to the needs of this kind of scissors shearing nevertheless to operate, thereby easily is scalded safelyly inadequately, can influence the temperature in the oven moreover, thereby can influence the distance of two gauge length lines of dumbbell appearance.
Therefore, in the related art, in order to enable a dumbbell to unload a weight without opening an oven, a release mechanism capable of automatically releasing is generally arranged on the weight to clamp the lower end of the dumbbell, so that when the weight needs to be unloaded, the release mechanism releases the dumbbell, and the weight and the release mechanism fall together, for example, the invention patent application with the publication number of CN115219345A discloses a cable insulation thermal extension test device and a test method, in the application, a normally closed pneumatic clamp (namely the release mechanism) is arranged, and a high-pressure air flow is controlled by an electromagnetic valve to be filled into the normally closed pneumatic clamp through an air source, so that the normally closed pneumatic clamp is separated from the lower end of the dumbbell sheet sample, and the normally closed pneumatic clamp and a load weight fall together, and the aim of unloading the weight is fulfilled; however, in this way, the weight of the load at the lower end of the dumbbell is equivalent to the sum of the weight and the pneumatic clamp, and like the automatic release mechanism of the pneumatic clamp, there are pipes and/or electric wires connected with the pneumatic clamp (in the case of the pneumatic clamp, there is an air pipe connected with the pneumatic clamp), so that the existence of the pipes and the electric wires causes the total weight of the load at the lower end of the dumbbell to be difficult to calculate accurately, and the accuracy of the total weight of the load cannot be ensured, thereby affecting the accuracy of the test.
Disclosure of Invention
In order to solve at least one technical problem mentioned in the background art, the invention aims to provide a tool for a thermal extension test and a thermal extension test device.
In order to achieve the purpose, the invention provides the following technical scheme:
a tool for a thermal extension test comprises a tool rack, a weight assembly and a release mechanism, wherein the tool rack comprises a cross beam, the weight assembly is used for being hung at the lower end of a dumbbell shape, the release mechanism is arranged on the cross beam and used for releasably clamping the upper end of the dumbbell shape, the weight assembly comprises a main body part and two hanging rods which are respectively connected to two sides of the main body part and extend transversely, and the gravity center of the weight assembly is positioned above the hanging rods; brackets are arranged on two sides of the weight component, are positioned at the bottom of the crossbeam and are kept in position relative to the crossbeam; the brackets on both sides of the weight assembly are arranged at relative intervals to form a space for the free falling of the main body part, and the brackets comprise a hanging surface for hanging the hanging rods after the weight assembly falls down, wherein the hanging rods can rotate relative to the hanging surface.
Compare prior art, the advantage of this scheme of adoption lies in:
firstly, the upper end of the dumbbell sample is clamped by the releasing mechanism, so that when the dumbbell sample is used, the dumbbell sample and the weight assembly can fall together freely only by controlling the releasing mechanism to release the dumbbell sample, and the weight can be removed. However, the manner of clamping the weight at the dumbbell-like lower end by the release mechanism in the related art is equivalent to using the weight and the release mechanism as a whole as a load, so that the partial structure of the release mechanism (such as a pipeline or a wire) affects the total weight of the load, and the weight of the load cannot be determined, thereby affecting the accuracy of the test.
Secondly, the releasing mechanism is arranged at the upper end of the dumbbell-shaped sample, when the releasing mechanism releases the dumbbell-shaped sample, the dumbbell-shaped sample can fall along with the weight assembly, the dumbbell-shaped sample is generally made of rubber and the like and can be melted to a certain extent at high temperature, and therefore if the dumbbell-shaped sample falls to the bottom of the tool rack, the dumbbell-shaped sample can be adhered to the bottom of the tool rack, and subsequent tests are affected; in addition, a part of the area of the dumbbell may be folded during the falling process, so that the folded parts are adhered to each other, and the subsequent test is also affected.
Based on the above process, in this scheme, through set up the peg in the both sides of weight subassembly, bottom setting at the crossbeam is located weight subassembly both sides bracket, so the dumbbell appearance is after being released, weight subassembly and dumbbell appearance drop downwards, in the in-process that drops, the peg of weight subassembly both sides can finally be hung on the hanging face of both sides bracket and be hung, weight subassembly just can be hung by unsettled and can't continue to fall this moment, and the focus of weight subassembly is located the upper portion of peg in this scheme, and the peg can be for hanging the face pivoted, so when the peg is hung on hanging the face, weight subassembly can overturn 180 downwards together with the weight peg under the dead weight, weight subassembly in the in-process of upset, can drive the upset together of the dumbbell appearance centre gripping on it, thereby throw the dumbbell appearance to the downside of weight subassembly, the dumbbell appearance just is dragged the downside of weight subassembly by unsettled this moment, do not contact with the bottom of frock frame, thereby avoid with the bottom adhesion of frock frame, in addition, dumbbell assembly is along with the upset regional condition that the upset can prevent the upset of 180 degrees of the upset of the regional subassembly of the upset of the lower part and can be carried out the upset condition of the upset, so as the upset.
Preferably, one side of the bracket facing the hanging rod is provided with a notch which vertically extends to allow the hanging rod to vertically move, wherein the groove bottom of the notch forms the hanging surface.
Preferably, the hanging rod is of a round rod structure, and the groove bottom of the notch is of an arc surface.
Preferably, the upper end of the notch is provided with an opening, and the notch is gradually narrowed from top to bottom.
Preferably, the releasing mechanism comprises two movable chucks movably arranged along the length direction of the beam and a linkage assembly for driving the two movable chucks to approach or keep away from each other along the length direction of the beam, the bottoms of the side walls at the opposite sides of the two movable chucks are provided with first steps, and the outer sides of the first steps are provided with first blocking pieces.
Preferably, the linkage assembly comprises sliders and a linkage block, the sliders are arranged on the back sides of the movable chucks and are arranged in a sliding mode along the length direction of the beam, the linkage block is located between the sliders on the two movable chucks and can move vertically, the linkage block faces the side walls of the two sides of the two sliders to form first inclined guide surfaces respectively, one sides of the two sliders facing the first inclined guide surfaces form second inclined guide surfaces, and when the linkage block is pushed vertically downwards, the first inclined guide surfaces act on the second inclined guide surfaces to enable the two sliders to slide in the direction away from each other; and a tension spring for driving the two sliding blocks to approach each other is also arranged between the two sliding blocks.
Preferably, a linkage shaft is arranged at the top of the linkage block, the linkage shaft extends vertically, and the upper end of the linkage shaft movably penetrates out of the top of the cross beam.
Preferably, the body part comprises a weight box, a cavity for accommodating weights is arranged in the weight box, the cavity comprises a cavity opening, and a cover plate which is used for closing the opening and can be opened is arranged at the position, located in the cavity opening, of the weight box.
The invention further provides a thermal extension test device which comprises an oven and a tool, wherein the oven is provided with a detection mechanism for detecting the distance between gauge length lines on a dumbbell sample, and the tool adopts the tool for the thermal extension test; the testing device further comprises a pushing mechanism used for vertically pushing the linkage shaft downwards.
Preferably, the pushing mechanism comprises a motor, a screw rod and a guide rod, the guide rod is vertically movably arranged at the top of the oven in a penetrating mode, a pushing head which is located in the oven and used for pushing the linkage shaft downwards is arranged at the bottom of the guide rod, a connecting rod in threaded connection with the screw rod is arranged at the upper end of the guide rod, and the screw rod vertically extends and is driven by the motor to rotate.
Other advantages and effects of the invention are explained in detail in the detailed description and the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the structure of embodiment 1 (in an initial state);
FIG. 2 is a schematic structural view (in a towing state) of embodiment 1;
FIG. 3 is a front view of embodiment 1 (in a towed state);
FIG. 4 is a schematic structural view of the bracket;
FIG. 5 is a schematic structural diagram of a release mechanism;
FIG. 6 is an exploded view of the release mechanism;
FIG. 7 is a schematic view of the movable chuck;
fig. 8 is a schematic structural view of a weight assembly;
fig. 9 is a bottom structural schematic view of the weight assembly;
FIG. 10 is a schematic view of the structure of embodiment 2;
FIG. 11 is a schematic view of the internal structure of embodiment 2;
fig. 12 is a schematic structural view of the pushing mechanism.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-9, the present embodiment provides a tooling for thermal extension test, which includes a tooling frame 1, a weight assembly 2 and a releasing mechanism, and the tooling provided by the present embodiment is mainly used for clamping a dumbbell sample during thermal extension test, as shown in fig. 1, fig. 2 and a portion a in fig. 8. The two end mechanisms of the dumbbell in the dumbbell sample embodiment are basically the same, and have no substantial distinguishing significance, but for convenience of description, one end of the dumbbell in the embodiment connected with the weight assembly 2 is recorded as the lower end of the dumbbell, and the other corresponding end is recorded as the upper end of the dumbbell.
As shown in fig. 1, the tooling frame 1 mainly comprises a base 12 and a cross beam 11, the cross beam 11 is horizontally installed above the base 12 through a column 13, and the release mechanism is arranged on the cross beam 11 for releasably holding the upper end of the dumbbell.
The weight component 2 is used as a load and is hung at the lower end of the dumbbell shape, and can be seen in figure 1; the weight component 2 comprises a main body part and two hanging rods 21 which are respectively connected with two sides of the main body part and extend transversely, and the two hanging rods 21 are symmetrically arranged on two sides of the main body part; the transverse direction is also understood here to mean the longitudinal direction of the cross member 11 or the direction of extent of the cross member 11.
In the initial state, i.e. the state shown in fig. 1, the upper end of the dumbbell is held by the release mechanism and the weight assembly 2 is naturally suspended at the lower end of the dumbbell; the gravity center of the weight assembly 2 is located above the hanging rod 21, so as to ensure that the weight assembly 2 can overturn under the self-weight when the hanging rod 21 is hung.
As shown in fig. 1-3, the weight assembly 2 is provided with brackets 3 on both sides, the brackets 3 being fixedly mounted at the bottom of the beam 11 to maintain positioning relative to the beam 11; the brackets 3 on both sides of the weight assembly 2 are arranged relatively spaced to form a space for the body part to fall freely, and in an initial state, as shown in fig. 1, the weight assembly 2 is suspended in a spaced spatial position between the brackets 3, at which position the weight assembly 2 falls freely when the release mechanism releases the dumbbell-like shape.
The brackets 3 each comprise a mounting surface 311 for mounting the suspension rod 21 after the weight assembly 2 has been dropped, wherein the suspension rod 21 can be rotated relative to the mounting surface 311, or the suspension rod 21 can be rotated on the basis of the mounting surface 311.
When the weight releasing device is used, the dumbbell body and the weight assembly 2 can fall freely together only by controlling the releasing mechanism to release the dumbbell body, and the weight can be detached, compared with the mode that the releasing mechanism is arranged at the lower end of the dumbbell body in the related technology, the releasing mechanism is not used as the load at the lower end of the dumbbell body in the embodiment, so that the structure of the weight releasing device does not influence the weight of the load hung at the lower end of the dumbbell body, the test is basically not influenced, the load at the lower end of the dumbbell body is basically formed by the weight assembly 2, and the weight of the weight assembly 2 is definite, so that the test accuracy can be ensured.
In the prior art, the weight is clamped at the lower end of the dumbbell by the release mechanism, which is equivalent to the weight and the release mechanism as a whole as a load, so that the partial structure of the release mechanism (such as a pipeline or a wire) affects the total weight of the load, and the weight of the load cannot be determined, thereby affecting the accuracy of the test data.
In addition, the releasing mechanism is arranged at the upper end of the dumbbell-shaped sample, although the weight removing operation can be realized, when the releasing mechanism releases the dumbbell-shaped sample, the dumbbell-shaped sample can fall along with the weight component 2, the dumbbell-shaped sample is generally made of rubber and the like and can be melted to a certain extent at high temperature, and therefore if the dumbbell-shaped sample falls to the bottom of the tool rack 1, the dumbbell-shaped sample can be adhered to the bottom of the tool rack 1, and subsequent tests are affected; in addition, the dumbbell sample may be folded in a partial area in the falling process, so that the folded parts are mutually adhered to influence subsequent tests, specifically, the dumbbell sample has certain retraction performance after the weight is removed, if the dumbbell sample is adhered, the retraction performance is reduced or even cannot be retracted, and the retraction rate of the dumbbell sample cannot be checked.
Based on the above process, in the embodiment, by arranging the hanging rods 21 on both sides of the weight assembly 2 and arranging the brackets 3 on both sides of the weight assembly 2 at the bottom of the beam 11, after the dumbbell shape is released, the weight assembly 2 and the dumbbell shape fall downwards, during the falling process, the hanging rods 21 on both sides of the weight assembly 2 are finally hung on the hanging surfaces 311 of the brackets 3 on both sides to be hung, at this time, the weight assembly 2 is hung in the air and cannot fall further, while in the present scheme, the gravity center of the weight assembly 2 is located at the upper part of the hanging rods 21, and the hanging rods 21 are rotatable relative to the hanging surfaces 311, so when the hanging rods 21 are hung on the hanging surfaces 311, the weight assembly 2 can turn downwards by the self weight along with the hanging rods 21, during the turning process of the weight assembly 2, the dumbbell shape clamped thereon can be driven to turn over together, thereby throwing the dumbbell shape to the lower side of the weight assembly 2, at this time, the dumbbell shape is dragged to the lower side of the weight assembly 2, and enters the state shown in fig. 2 and fig. 3;
equivalently, in the towing state, as shown in fig. 2 and 3, the weight assembly 2 is turned over 180 ° and is mounted on the mounting surface 311 of the bracket through the mounting rod 21, at this time, the lower end of the dumbbell shape is positioned above the upper end of the dumbbell shape, the whole dumbbell shape is naturally suspended and towed, and the lower end of the dumbbell shape is suspended above the base 12. In the actual design, it needs to be ensured that a certain vertical interval exists between the carrying surface of the bracket 3 and the base 12, so as to ensure that the upper end of the dumbbell sample does not contact the base 12 in the dragging and hanging state, and thus the adhesion of the dumbbell sample to the base 12 of the tool rack 1 is avoided.
In addition, the dumbbell shape is along with weight subassembly 2 with the mode upset 180 ° to the lower part position of weight subassembly 2, rather than the downside of weight subassembly 2 that directly drops vertically downwards, so can prevent the condition that the mutual folding adhesion of partial region of dumbbell shape appears, guaranteed that subsequent experiment can normally go on. Moreover, the weight removing mode can also meet the weight removing requirement specified in GB 2951.21.
In addition, in other alternative embodiments, in order to realize multiple sets of dumbbell-like tests at a time, as shown in fig. 1-3, the release mechanisms, the weight assemblies 2 and the brackets 3 can be provided in multiple numbers, wherein multiple release mechanisms are sequentially provided along the length direction of the beams 11, and each release mechanism corresponds to one weight assembly 2; the brackets 3 are sequentially distributed at intervals along the length direction of the beam 11, a space for the weight component 2 to freely fall is formed between every two adjacent brackets 3 at intervals, and the weight component 2 is positioned between every two adjacent brackets 3 when the weight component is used.
The specific structure for the carrier 3 is: referring to fig. 1 and 4, one side of the bracket 3 facing the hanging rod 21 is provided with a vertically extending notch 31 for the hanging rod 21 to move vertically, specifically, in this embodiment, the bracket 3 is a cylindrical structure with an open upper end, and the two lateral side walls of the bracket 3 are both provided with the notch 31, so that the notches 31 on the two lateral side walls of the two adjacent brackets 3 are respectively used for the two hanging rods 21 on the weight assembly 2 to hang; in addition, a reinforcing rib plate 312 is provided inside the bracket 3 in order to reinforce the strength of the bracket 3.
Wherein, the tank bottom of notch 31 forms carry face 311, and peg 21 is along the vertical whereabouts of notch 31, and the tank bottom that can hang at notch 31 finally is held by the tank bottom, in addition, can comparatively smoothly rotate at the tank bottom in order to guarantee peg 21, in this embodiment, peg 21 is the round bar structure, as shown in fig. 4, the tank bottom of notch 31 is the arc surface. The hanging rod 21 having the circular rod structure can be rotated on the mounting surface 311 having the arc-shaped groove bottom.
In order to facilitate the hanging rod 21 to be placed in the position of the notch 31, in this embodiment, an opening is formed in the upper end of the notch 31; in addition, the notch 31 is gradually narrowed from top to bottom, for example, a V-shaped notch 31 is adopted. It should be noted that the trend of the notch 31 narrowing from top to bottom also includes the case where, as shown in fig. 4, the upper position of the notch 31 is in a straight groove structure and narrows from top to bottom from the lower end position of the straight groove. The arrangement can make the upper end position opening of the notch 31 larger, so as to facilitate the putting in of the hanging rod 21.
In this embodiment, all the releasing mechanisms have substantially the same structure, so that one of the releasing mechanisms is taken as an example for description in this embodiment:
referring to fig. 5 and 6, the release mechanism includes a fixed block 40 having a receiving cavity therein, and two movable clamps 41 movably disposed along the length direction of the cross beam 11, specifically, the two movable clamps 41 are plate-shaped and slidably disposed on the front side wall of the fixed block 40, as shown in fig. 1 and 2.
As shown in fig. 6 and 7, the two movable chucks 41 are symmetrically arranged, the bottoms of the side walls of the two opposite sides of the two movable chucks 41 are both provided with a first step 411, the first step 411 is adapted to the inclined wall of the dumbbell-shaped end portion, the outer side of the first step 411 is provided with a first blocking piece 412, and the movable chuck further comprises a linkage assembly for driving the two movable chucks 41 to approach or move away from each other along the length direction of the cross beam 11.
The two movable chucks 41 clamp the upper end of the dumbbell sample together, and in the clamped state, as shown in fig. 1, the inclined walls on the two sides of the upper end of the dumbbell sample are respectively clamped on the two first steps 411 of the two movable chucks 41 to stop the dumbbell sample from falling, the dumbbell sample leans against the front end wall of the fixed block 40, and the first baffle 412 is located on the front side of the upper end of the dumbbell sample to laterally limit the dumbbell sample, so as to prevent the dumbbell sample from falling out from the front side of the fixed block 40.
The linkage assembly comprises a sliding block 42 and a linkage block 43 which are arranged on the back side of the movable chuck 41 and arranged in a sliding manner along the length direction of the cross beam 11, specifically, two guide shafts 401 extending transversely (the transverse direction can also be understood as the length direction of the cross beam 11) are arranged in an accommodating cavity of the fixed block 40, and the two sliding blocks 42 are arranged on the two guide shafts 401 in a sliding manner so as to realize transverse movement; a tension spring 44 is arranged between the two sliding blocks 42, wherein two ends of the tension spring 44 are respectively fixed with the two sliding blocks 42 so as to drive the two sliding blocks 42 to be close to each other.
The linkage block 43 is positioned in the accommodating cavity of the fixed block 40 and between the two sliding blocks 42, and the linkage block 43 can vertically move in the accommodating cavity; as shown in fig. 6, the two side walls of the linkage block 43 facing the two sliders 42 respectively form first inclined guide surfaces 431, and the two first inclined guide surfaces 431 are gradually closed from top to bottom.
A second inclined guide surface 421 is formed on one side of the two sliding blocks 42 facing the first inclined guide surface 431, and the two second inclined guide surfaces 421 are gradually closed from top to bottom, so that when a force is applied to the linkage block 43 to push the linkage block 43 to vertically move downwards, the first inclined guide surface 431 pushes the second inclined guide surface 421, the two sliding blocks 42 slide in the direction of being far away from each other by overcoming the tension of the tension spring 44, the two movable chucks 41 are driven to be far away from each other, and at the moment, the two movable chucks 41 loosen the clamping on the upper end of the dumbbell shape to release the dumbbell shape; when the force applied to the linkage block 43 is released, the two sliding blocks are pulled to be close to each other under the tension of the tension spring 44, so that the two movable chucks 41 are closed to clamp the upper end of the dumbbell shape, and when the two sliding blocks are closed, the second inclined guide surface 421 pushes the first inclined guide surface 431 to further vertically lift the linkage block 43 to return to the initial position.
It should be noted that, by providing the linkage block 43, the first inclined guide surface 431 and the second inclined guide surface 421 are matched, so that the linkage block 43 can simultaneously drive the two sliders 42 to move away from each other when moving downwards, and when the linkage block 43 is released, the two sliders 42 can keep moving close to each other synchronously under the pulling of the tension spring 44.
In order to apply force to the linkage block 43, in this embodiment, a linkage shaft 432 is disposed at the top of the linkage block 43, and the linkage shaft 432 extends vertically and has an upper end movably penetrating through the top of the fixed block 40 and finally penetrating through the top of the cross beam 11. Thus, the downward movement of the linkage block 43 can be realized only by pressing the linkage shaft 432.
In order to change the weight of the weight assembly 2, in the embodiment, as shown in fig. 8 and 9, the main body portion comprises the weight box 22, the weight box 22 is provided with a cavity 221 for accommodating weights, the cavity 221 comprises a cavity opening, the cavity opening is positioned at the bottom of the weight box 22, the weight box 22 is provided with a cover plate 222 which is used for closing the opening and can be opened and is positioned at the cavity opening of the cavity, when the weight assembly is used, only the cover plate 222 needs to be opened, weights with preset quantity or weight are inserted into the cavity 221 through the cavity opening, and then the cover plate 222 is closed.
As for the specific structure of the cover plate 222, as shown in fig. 9, the cover plate 222 is horizontally and rotatably disposed on the bottom wall of the weight box 22, and the spring ball 223 is disposed on the bottom wall of the weight box 22, and a corresponding fastening hole (not shown in the figure for view reasons) for fastening the spring ball 223 is disposed on the side wall of the cover plate facing the weight box 22 corresponding to the position of the spring ball 223, and when the cover plate 222 is rotated to rotate the fastening hole to the position of the spring ball 223, the spring ball 223 can be inserted into the fastening hole to fix the cover plate 222. When the cover plate 222 needs to be opened, as long as the cover plate 222 is rotated by force, the spring balls 223 can be retracted inwards and finally can be pulled out of the clamping holes, and the cover plate 222 can be opened.
In addition, as shown in fig. 8, in order to enable the weight assembly 2 to be hung on the lower end of the dumbbell shape in this embodiment, the main body further includes a carrier plate 23 disposed on the top of the weight box 22, a slot 231 for placing the lower end of the dumbbell shape is disposed on the side wall of the carrier plate 23, wherein the slot walls on both sides of the top of the slot 231 are inclined towards the middle to form a second step 232, two second retaining pieces 233 are respectively and fixedly disposed on the outer sides of the two second steps 232, when in use, the lower end of the dumbbell shape is placed in the slot 231, the inclined walls on both sides of the lower end of the dumbbell shape are finally retained at the positions of the two second steps 232, so that the whole weight assembly 2 cannot directly fall off the dumbbell shape, and the second retaining pieces can limit the side of the dumbbell shape on the side of the carrier plate 233 to prevent the dumbbell shape from falling off the dumbbell 23 from the side.
Example 2
With reference to fig. 1 to 12, the present embodiment provides a thermal extension test apparatus based on embodiment 1, as shown in fig. 10, including an oven 5 and a tool, where the tool is the tool for thermal extension test described in embodiment 1; oven 5 is last to be equipped with the detection mechanism who is used for detecting the scale distance line interval on the dumbbell appearance, specifically, uses the dumbbell appearance that has two scale distance lines as the example in this embodiment, and detection mechanism is used for detecting the interval between two scale distance lines in oven 5.
The detection mechanism can adopt a visual detection system, as shown in fig. 11, and includes a camera 51 and a processing module, the camera 51 is installed on the back side of the oven 5 and used for shooting and tracking the gauge length lines on the dumbbell sample in real time, and feeding back the shot result to the processing module, and the distance between the two gauge length lines is calculated through the processing module.
Of course, other detection mechanisms capable of detecting the distance between the gauge lines in the oven 5 may be used, and are not particularly limited herein.
In order to cooperate with the linkage shaft 432 in the release mechanism so that the release mechanism can release the dumbbell without opening the oven 5, in this embodiment, the testing apparatus further includes an urging mechanism 6 for urging the linkage shaft 432 vertically downward. Specifically, the method comprises the following steps:
referring to fig. 12, the pushing mechanism 6 includes a motor 61, a lead screw 62 and a guide rod 63, the motor 61 is fixedly mounted on the top of the oven 5, and a spindle of the motor is vertically downward, the lead screw 62 is vertically and fixedly mounted on the spindle of the motor 61 and driven by the motor 61 to rotate; two guide rods 63 are arranged and vertically movably penetrate through the top of the oven 5, the upper ends of the two guide rods 63 are connected through a connecting rod 64, and the connecting rod 64 is in threaded connection with the lead screw 62.
The bottom of the guide rod 63 is provided with a push head 65 which is positioned in the oven 5 and used for pushing the linkage shaft 432 downwards, in order to drive all the linkage shafts 432 to move simultaneously, the push head 65 is in a strip structure in the embodiment and is horizontally and fixedly installed at the lower ends of the two guide rods 63, so that when the device is used, the motor drives the lead screw 62 to rotate, the lead screw 62 drives the connecting rod 64 to move downwards, the guide rods 63 are driven to move downwards, the guide rods 63 drive the push head 65 to move downwards, the linkage shaft 432 is downwards extruded in the downward moving process of the push head 65, the linkage shaft 432 is moved downwards, and the release action is completed.
Before a test, clamping the dumbbell sample on the tool outside the oven 5, then putting the whole tool into the oven 5 at 200 ℃, tracking a gauge length line through the camera 51, and after the oven 5 is kept for 10min, pressing down through the pushing mechanism to drive the releasing mechanism to release the dumbbell sample; and finally, taking out the whole tool, cooling for a period of time, and manually detecting the distance between the gauge length lines on the dumbbell sample again to finish the test action.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A tool for a thermal extension test comprises a tool rack, a weight assembly and a release mechanism, wherein the tool rack comprises a cross beam, the weight assembly is used for being hung at the lower end of a dumbbell shape, the tool rack is characterized in that the release mechanism is arranged on the cross beam and used for releasably clamping the upper end of the dumbbell shape, the weight assembly comprises a main body part and two hanging rods which are respectively connected to two sides of the main body part and extend transversely, and the gravity center of the weight assembly is positioned above the hanging rods; brackets are arranged on two sides of the weight component, are positioned at the bottom of the crossbeam and keep positioning relative to the crossbeam; the brackets on both sides of the weight assembly are arranged at relative intervals to form a space for the free falling of the main body part, and the brackets comprise a hanging surface for hanging the hanging rods after the weight assembly falls down, wherein the hanging rods can rotate relative to the hanging surface.
2. The tooling for the thermal extension test according to claim 1, wherein one side of the bracket facing the hanging rod is provided with a notch extending vertically for the hanging rod to move vertically, wherein the groove bottom of the notch forms the hanging surface.
3. The tooling for the thermal extension test according to claim 2, wherein the hanging rod is of a round rod structure, and the groove bottom of the notch is of a circular arc surface.
4. The tooling for the thermal extension test according to claim 2, wherein the upper end of the notch is provided with an opening, and the notch is gradually narrowed from top to bottom.
5. The tooling for the thermal extension test according to claim 1, wherein the release mechanism comprises two movable chucks movably arranged along the length direction of the beam and a linkage assembly for driving the two movable chucks to approach or depart from each other along the length direction of the beam, the bottoms of the side walls at the opposite sides of the two movable chucks are respectively provided with a first step, and the outer side of each first step is provided with a first blocking piece.
6. The tooling for the thermal extension test according to claim 5, wherein the linkage assembly comprises sliders and linkage blocks, the sliders and the linkage blocks are arranged on the back sides of the movable chucks and are arranged in a sliding mode along the length direction of the beam, the linkage blocks are located between the sliders on the two movable chucks and can move vertically, first inclined guide surfaces are respectively formed on the side walls, facing the two sliders, of the linkage blocks, one sides, facing the first inclined guide surfaces, of the two sliders are provided with second inclined guide surfaces, and when the linkage blocks are pushed vertically downwards, the first inclined guide surfaces act on the second inclined guide surfaces to enable the two sliders to slide in the direction away from each other; and a tension spring for driving the two sliding blocks to approach each other is also arranged between the two sliding blocks.
7. The tooling for the thermal extension test according to claim 6, wherein a linkage shaft is arranged at the top of the linkage block, the linkage shaft extends vertically, and the upper end of the linkage shaft movably penetrates out of the top of the cross beam.
8. The tooling for the thermal extension test according to claim 1, wherein the main body part comprises a weight box, a cavity for accommodating a weight is arranged in the weight box, the cavity comprises a cavity opening, and a cover plate which is used for sealing the opening and can be opened is arranged at the position of the cavity opening of the weight box.
9. A thermal extension test device comprises an oven and a tool, wherein the oven is provided with a detection mechanism for detecting the distance between gauge length lines on a dumbbell sample, and the thermal extension test device is characterized in that the tool used for the thermal extension test according to claim 7 is adopted; the testing device further comprises a pushing mechanism used for vertically pushing the linkage shaft downwards.
10. The thermal extension test device according to claim 9, wherein the pushing mechanism comprises a motor, a lead screw and a guide rod, the guide rod is vertically movably arranged at the top of the oven in a penetrating manner, a pushing head located in the oven and used for pushing the linkage shaft downwards is arranged at the bottom of the guide rod, a connecting rod in threaded connection with the lead screw is arranged at the upper end of the guide rod, and the lead screw vertically extends and is driven by the motor to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211550999.8A CN115753443B (en) | 2022-12-05 | 2022-12-05 | Tool for thermal extension test and thermal extension test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211550999.8A CN115753443B (en) | 2022-12-05 | 2022-12-05 | Tool for thermal extension test and thermal extension test device |
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| Publication Number | Publication Date |
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| CN115753443A true CN115753443A (en) | 2023-03-07 |
| CN115753443B CN115753443B (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211550999.8A Active CN115753443B (en) | 2022-12-05 | 2022-12-05 | Tool for thermal extension test and thermal extension test device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3127625U (en) * | 2006-09-27 | 2006-12-07 | 株式会社島津製作所 | Material testing machine |
| CN215296995U (en) * | 2021-06-07 | 2021-12-24 | 四川明达电线电缆科技有限公司 | High-efficiency easy-to-operate cable insulation thermal extension test device |
| CN215768347U (en) * | 2021-09-01 | 2022-02-08 | 浙江方圆检测集团股份有限公司 | Thermal extension test device |
| CN115219345A (en) * | 2021-04-16 | 2022-10-21 | 杭州国翌科技有限公司 | Cable insulation thermal extension test device and test method |
-
2022
- 2022-12-05 CN CN202211550999.8A patent/CN115753443B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3127625U (en) * | 2006-09-27 | 2006-12-07 | 株式会社島津製作所 | Material testing machine |
| CN115219345A (en) * | 2021-04-16 | 2022-10-21 | 杭州国翌科技有限公司 | Cable insulation thermal extension test device and test method |
| CN215296995U (en) * | 2021-06-07 | 2021-12-24 | 四川明达电线电缆科技有限公司 | High-efficiency easy-to-operate cable insulation thermal extension test device |
| CN215768347U (en) * | 2021-09-01 | 2022-02-08 | 浙江方圆检测集团股份有限公司 | Thermal extension test device |
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| CN115753443B (en) | 2023-07-25 |
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