Method and device for preparing a test piece of the interface between a composite propellant ap and a binder

Abstract

The application relates to the technical field of composite propellant mechanical property testing, and particularly provides a composite propellant AP and adhesive interface test piece preparation method and device.The device comprises a bottom plate, positioning plates, a top plate, clamping heads and a cover plate, wherein the positioning plates are at least two, and the bottom plate, the positioning plates, the top plate, the clamping heads and the cover plate are sequentially stacked from bottom to top, the clamping head comprises a head part and a tail part, the head part is used for bonding ammonium perchlorate tablets, the tail part is installed in mounting holes of the bottom plate and the top plate, and the head part is in a second mounting hole of the positioning plate, so that the two corresponding clamping heads are oppositely arranged, and the head part and the head part have a space, the space can be filled with adhesive, and finally the two oppositely arranged clamping heads and the solidified adhesive form an integrated interface test piece, thereby effectively solving the problem that the interface mechanical properties between the AP and the adhesive cannot be accurately obtained through experimental means in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical property testing of composite propellant, and in particular to a preparation method and device of an interface test piece of AP and binder of composite propellant. BACKGROUND

[0002] Composite propellant is a propellant composed of a high polymer binder, a solid powder oxidizer, a powder metal fuel and other additional components. In composite solid rocket propellant, AP generally refers to ammonium perchlorate, which is a commonly used solid powder oxidizer. AP plays a key role in composite propellant, because it supports the combustion of fuel as an oxidizer of composite propellant on the one hand, and enhances the mechanical properties of the binder matrix on the other hand.

[0003] Ammonium perchlorate AP is usually in the form of particles together with the binder to form a composite propellant, and the interfacial mechanical properties between the filler particles and the binder are a key factor affecting the mechanical properties of the composite propellant. Therefore, it is of great significance to accurately obtain the interfacial mechanical properties of the filler particles and the binder in the composite propellant.

[0004] Because the size of AP filler particles is small, the interface test piece of AP and the binder is not easy to prepare, and thus the interfacial mechanical properties of AP and the binder are difficult to be directly measured by experiment, and thus the influence of the interfacial mechanical properties on the mechanical properties of the solid composite propellant cannot be accurately evaluated in production.

[0005] Therefore, a preparation method and device of an interface test piece of AP and the binder of composite propellant are provided, which can accurately obtain the interfacial mechanical properties between AP and the binder by experimental method. SUMMARY

[0006] The present application provides a preparation method and device of an interface test piece of AP and the binder of composite propellant, which solves the problem that the interfacial mechanical properties between AP and the binder cannot be accurately obtained by experimental means in the prior art.

[0007] In a first aspect, the present application provides a preparation device of an interface test piece of AP and the binder of composite propellant, comprising:

[0008] A bottom plate is provided with a plurality of first mounting holes arranged in the length direction, and a plurality of first positioning stakes and first positioning holes are vertically arranged in the height direction;

[0009] Positioning plate, at least two oppositely arranged, arranged in length direction with a plurality of second mounting holes, and vertically opened in height direction with a plurality of second positioning holes; the diameter of the second mounting hole is larger than the first mounting hole, and the opening edge of the oppositely arranged two second mounting holes forms a step and constitutes a limiting ring groove; the limiting ring groove is embedded with a positioning ring; a plurality of positioning plates are arranged in each other.

[0010] Top plate, overlappingly arranged on the upper end surface of the positioning plate, arranged in length direction with a plurality of third mounting holes, and vertically arranged in height direction with a plurality of second positioning piles and third positioning holes.

[0011] Clamping head, at least two oppositely arranged, including a cylindrical head and a cylindrical tail, the head and the tail are coaxially connected, and the head is further connected with ammonium perchlorate tablet on the end surface away from the tail, wherein the head is movably installed in the oppositely arranged second mounting hole, and the tail is movably installed in the oppositely arranged first mounting hole and third mounting hole; the oppositely arranged ammonium perchlorate tablets are filled with adhesive.

[0012] Cover plate, overlappingly arranged on the upper end surface of the top plate, connected with the tail of the clamping head, used to provide space for the filling of the adhesive.

[0013] Wherein, the first positioning pile penetrates the second positioning hole and the third positioning hole, and the second positioning pile penetrates the first positioning hole and the second positioning hole.

[0014] According to the composite propellant AP and adhesive interface test piece preparation device provided by the application, the cover plate is arranged in length direction with a plurality of limiting holes, the tail end surface of the clamping head is coaxially provided with a threaded hole, the threaded hole is threadedly connected with an adjusting bolt, the adjusting bolt penetrates the limiting hole and cooperates with the threaded hole, and the adjusting bolt can be limited in the limiting hole under the condition of rotation.

[0015] According to the composite propellant AP and adhesive interface test piece preparation device provided by the application, the top plate and the bottom plate are provided with pull rings.

[0016] According to the composite propellant AP and adhesive interface test piece preparation device provided by the application, the positioning plate comprises: a first positioning plate and a second positioning plate, the first positioning plate is overlapped to the upper end surface of the second positioning plate.

[0017] Further comprising a first demolding support and a second demolding support, wherein the first demolding support and the second demolding support respectively have at least three supporting feet; the top plate and the two side faces of the first positioning plate are respectively provided with a first avoiding slot in the height direction, and the bottom plate and the two side faces of the second positioning plate are respectively provided with a second avoiding slot in the height direction, and the first avoiding slot and the second avoiding slot are not collinear in the length direction;

[0018] The supporting feet of the first demolding support penetrate through the first avoiding slot and press against the upper end face of the second positioning plate; and the supporting feet of the second demolding support penetrate through the second avoiding slot and press against the lower end face of the first positioning plate.

[0019] In a second aspect, the application further provides a preparation method of an interface test piece of a composite propellant AP and an adhesive:

[0020] S1, preparing ammonium perchlorate tablets;

[0021] S2, bonding the prepared ammonium perchlorate tablets to the head portions of the plurality of clamping heads respectively;

[0022] S3, placing the bottom plate flat, and placing the tail portions of the bonded clamping heads into the first mounting holes; then stacking a second positioning plate on the bottom plate, and coaxially arranging the first mounting holes and the second mounting holes; then placing the positioning ring on the step formed at the opening edge of the second mounting hole; and then stacking the first positioning plate on the second positioning plate;

[0023] S4, preparing an adhesive mixture according to a propellant formula, and pouring the prepared adhesive mixture into the positioning ring;

[0024] S5, inserting the tail portions of the prepared multiple groups of clamping heads into the third mounting holes formed in the top plate from bottom to top, and combining and mounting the cover plate, the clamping heads and the top plate through the adjusting bolts to form a combined body;

[0025] S6, mounting the head portions of the clamping heads in the combined body into the second mounting holes of the first positioning plate, so that the ammonium perchlorate tablets above are in contact with the adhesive mixture;

[0026] S7, placing the prepared interface test piece preparation device as a whole into a high-temperature box for heating and curing, realizing the interface curing and bonding of the adhesive mixture and the ammonium perchlorate tablets, so as to obtain the interface test piece.

[0027] According to the preparation method of the interface test piece of the composite propellant AP and the adhesive provided by the application, the S6 further comprises:

[0028] When the ammonium perchlorate tablets are in contact with the adhesive mixture, the adjusting bolt is rotated to adjust the distance between the ammonium perchlorate tablets arranged above and below.

[0029] The application provides an interface test piece preparation method of a composite propellant AP and an adhesive.

[0030] S101, an ammonium perchlorate tablet preparation device is obtained, the device comprising a base, a pressing cylinder and a pressing column, the pressing cylinder is coaxially arranged on the base, and a sealing ring is arranged at the joint of the base and the pressing cylinder; the pressing cylinder has a pressing cavity in the axial direction, and the pressing column is slidingly arranged in the pressing cavity, and an exhaust passage is arranged in the radial direction of the pressing cylinder;

[0031] S102, the pressing column is pulled out of the pressing cavity, ammonium perchlorate powder is put into the pressing cavity, and the pressing column is arranged in the pressing cavity;

[0032] S103, the ammonium perchlorate tablet preparation device is arranged on the platform of a hydraulic machine to apply pressure according to a predetermined pressure curve;

[0033] S104, after the pressure is applied, the pressure is released, the ammonium perchlorate tablet preparation device is taken out, and the ammonium perchlorate tablet is obtained by demolding.

[0034] The application provides an interface test piece preparation device of a composite propellant AP and an adhesive, the bottom plate, the positioning plate, the top plate and the cover plate are sequentially stacked from bottom to top, and a plurality of mounting holes corresponding to each other are arranged in the height direction, so that the positioning and mounting of the clamping head can be realized, so that the ammonium perchlorate tablets arranged in the upper and lower directions have a certain space, and then the adhesive is injected into the space, so that the ammonium perchlorate tablets and the adhesive are adhered and fixed, and preparation is made for the next interface test piece tensile force test experiment.

[0035] The bottom plate is arranged, and a plurality of first mounting holes are arranged in the length direction of the bottom plate, so that the tail parts of the plurality of clamping heads can be mounted and positioned; the first positioning stake is arranged, and the first positioning stake can be inserted into the second positioning hole and the third positioning hole to position and connect the positioning plate and the top plate; the first positioning hole is arranged on the bottom plate, and the first positioning hole can be matched with the second positioning stake;

[0036] The plurality of positioning plates are arranged in a stacked manner, and a plurality of second mounting holes are arranged in the length direction of the pluralitying positioning plates, so that the head parts of the plurality of clamping heads can be mounted and positioned; the diameter of the second mounting hole is greater than the diameter of the first mounting hole, so that the clamping head can be limited during mounting, and the size of the clamping head can be adapted; the step is arranged at the opening edge of the second mounting hole, and forms a limiting ring groove, so that the limiting ring can be mounted;

[0037] Through the arrangement of the plurality of clamping heads, simultaneous bonding of a plurality of ammonium perchlorate tablets can be realized, and the plurality of clamping heads can be installed into the first mounting hole and the second mounting hole; by arranging the clamping head as a head and a tail, the head of the clamping head can be used to paste the ammonium perchlorate tablet, and the tail can be used for positioning;

[0038] Through the arrangement of the cover plate, the clamping head arranged above can be hoisted and fixed, so that the head portions of the clamping heads arranged above and below have a certain space, so as to facilitate injection of the adhesive.

[0039] Additional aspects and advantages of the present application will be described in part below, some of which will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 is a schematic diagram of the three-dimensional structure of the interface test piece preparation device provided by the present application;

[0042] Figure 2 is a schematic diagram of the cross-sectional structure of the interface test piece preparation device body along the height direction provided by the present application;

[0043] Figure 3 is a schematic diagram of the three-dimensional structure of the bottom plate provided by the present application;

[0044] Figure 4 is a schematic diagram of the three-dimensional structure of the second positioning plate provided by the present application;

[0045] Figure 5 is a schematic diagram of the three-dimensional structure of the top plate provided by the present application;

[0046] Figure 6 is a schematic diagram of the cross-sectional structure of the interface test piece along the height direction provided by the present application;

[0047] Figure 7 is a schematic diagram of the three-dimensional structure of the positioning ring provided by the present application;

[0048] Figure 8 is a flow chart of the interface test piece preparation method provided by the present application;

[0049] Figure 9 is a flow chart of the ammonium perchlorate tablet preparation method provided by the present application;

[0050] Figure 10 is a schematic structural diagram of an ammonium perchlorate tablet preparation device provided by the application;

[0051] Figure 11 is a pressurization curve of a hydraulic press provided by the application;

[0052] Figure 12 is a curve of tensile force-displacement of an interface test piece prepared by using the application on a test bench.

[0053] Reference signs:

[0054] 11, base; 12, sealing ring; 13, compression cylinder; 14, lower cushion block; 15, ammonium perchlorate powder; 16, upper cushion block; 17, compression column; 21, second demolding support; 22, first demolding support; 23, interface test piece preparation device body; 231, bottom plate; 2311, first mounting hole; 2312, second avoiding groove A; 2313, first positioning pile; 2314, first positioning hole; 2315, bottom plate body; 232, second positioning plate; 2321, positioning plate body; 2322, second mounting hole; 2323, step; 2324, second positioning hole; 2325, second avoiding groove B; 233, positioning ring; 234, interface test piece; 2341, tail part; 2342, head part; 2343, ammonium perchlorate tablet; 235, adhesive; 236, first positioning plate; 237, top plate; 2371, top plate body; 2372, third mounting hole; 2373, second positioning pile; 2374, third positioning hole; 2375, first avoiding groove A; 238, cover plate; 239, adjusting bolt; 240, pull ring. DETAILED DESCRIPTION

[0055] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0056] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0057] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] In the embodiments of the present application, unless specifically defined and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0059] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0060] The technical scheme of the present application is described below in conjunction with the embodiments shown in the drawings: Figures 1 to 9 As shown in the drawings: Figures 1 to 7

[0061] The embodiment of the present application provides a kind of composite propellant AP and the interface test piece preparation device of adhesive, comprising: bottom plate 231, positioning plate, top plate 237, clamping head and cover plate 238, wherein:

[0062] The bottom plate 231 includes the bottom plate body 2315, a plurality of first mounting holes 2311 are arranged on the bottom plate body 2315 along the length direction, and a plurality of first positioning piles 2313 and first positioning holes 2314 are vertically arranged along the height direction;

[0063] ​The positioning plate comprises a positioning plate body 2321, on the positioning plate body 2321, at least two oppositely arranged second mounting holes 2322 are arranged in the length direction, and a plurality of second positioning holes 2324 are vertically arranged in the height direction; the diameter of the second mounting hole 2322 is larger than that of the first mounting hole 2311, and a step 2323 is formed at the opening edge of the oppositely arranged two second mounting holes 2322, and constitutes a limiting ring groove; a limiting ring 233 is embedded in the limiting ring groove; a plurality of positioning plates are arranged in a superposed manner;

[0064] The top plate 237 is arranged on the upper end face of the positioning plate in a superposed manner, and a plurality of third mounting holes 2372 are arranged in the length direction, and a plurality of second positioning piles 2373 and third positioning holes 2374 are vertically arranged in the height direction;

[0065] The clamping head comprises at least two oppositely arranged head portions 2342 and tail portions 2341, the head portion 2342 and the tail portion 2341 are coaxially connected, and the connection mode of the two can be welding, bolt connection and integral molding; and the end face of the head portion 2342 away from the tail portion 2341 is further connected with an ammonium perchlorate tablet 2343, wherein the head portion 2342 is movably arranged in the oppositely arranged second mounting hole 2322, and the tail portion 2341 is movably arranged in the oppositely arranged first mounting hole 2311 and third mounting hole 2372; an adhesive 235 is injected between the oppositely arranged ammonium perchlorate tablets 2343;

[0066] The cover plate 238 is arranged on the upper end face of the top plate 237 in a superposed manner, and is connected with the tail portion 2341 of the clamping head, so as to provide space for the injection of the adhesive 235;

[0067] The first positioning pile 2313 penetrates the second positioning hole 2324 and the third positioning hole 2374, and the second positioning pile 2373 penetrates the first positioning hole 2314 and the second positioning hole 2324.

[0068] It can be understood that the clamping head finally forms an interface test piece 234 with the ammonium perchlorate tablet 2343 and the adhesive 235 as a group of two oppositely arranged clamping heads;

[0069] The interface test piece preparation device for the composite propellant AP and the adhesive provided by the embodiment of the application is prepared by stacking the bottom plate 231, the positioning plate, the top plate 237 and the cover plate 238 from bottom to top in sequence, and a plurality of mounting holes corresponding to each other are arranged in the height direction, so that the positioning and mounting of the clamping head can be realized, so as to ensure that there is a certain space between the upper and lower oppositely arranged ammonium perchlorate tablets 2343, and then the adhesive 235 is injected into the space, so that the ammonium perchlorate tablet 2343 and the adhesive 235 are bonded and fixed, and preparation is made for the next tensile force test experiment of the interface test piece 234. Specifically:

[0070] The setting of the bottom plate 231 and the arrangement of the plurality of first mounting holes 2311 along the length direction of the bottom plate 231 can realize the installation and positioning of the plurality of clamping head tail portions 2341; the first positioning stake 2313 can be inserted into the second positioning hole 2324 and the third positioning hole 2374 to position and connect the positioning plate and the top plate 237; the first positioning hole 2314 is arranged on the bottom plate 231, and the first positioning hole 2314 can realize cooperation with the second positioning stake 2373;

[0071] The plurality of positioning plates are arranged in an overlapping manner, and the plurality of second mounting holes 2322 are arranged along the length direction of the positioning plates, so that the installation and positioning of the plurality of clamping head head portions 2342 can be realized; the diameter of the second mounting hole 2322 is greater than the diameter of the first mounting hole 2311, so that the limiting of the clamping head during installation can be realized, and the size of the clamping head can be adapted; the step 2323 is arranged at the opening edge of the second mounting hole 2322, and forms a limiting ring groove, so that the installation of the positioning ring 233 can be realized;

[0072] The plurality of clamping heads are arranged, so that the plurality of ammonium perchlorate tablets 2343 can be simultaneously bonded, and the plurality of clamping heads can be installed into the first mounting hole 2311 and the second mounting hole 2322; the clamping head is arranged as the head portion 2342 and the tail portion 2341, so that the head portion 2342 of the clamping head can be used to paste the ammonium perchlorate tablet 2343, and the tail portion 2341 can be used for positioning;

[0073] The cover plate 238 is arranged, so that the clamping head arranged above can be fixed in a lifting manner, so that the head portions 2342 of the clamping heads arranged above and below have a certain space, so as to facilitate the injection of the adhesive 235.

[0074] The preparation device of the interface test piece 234 for bonding the composite propellant AP and the adhesive 235 according to the embodiment of the application is shown in FIGS. 1 to 5. Figure 1 and Figure 2

[0075] The cover plate 238 is arranged, so that the clamping head arranged above can be fixed in a lifting manner, so that the head portions 2342 of the clamping heads arranged above and below have a certain space, so as to facilitate the injection of the adhesive 235.

[0076] ​In some embodiments, the cover plate 238 has the same length as the top plate 237, the positioning plate, and the bottom plate 231, but a width smaller than that of the top plate 237, and is positioned in the middle during installation. It has five limiting holes arranged sequentially along its length, and the opening positions of these five limiting holes are coaxial with the first mounting hole 2311, the second mounting hole 2322, the third mounting hole 2372, and the threaded hole at the tail of the clamping head 2341. At this time, the adjusting bolt 239 can pass through the limiting hole and be threadedly connected to the threaded hole at the tail of the clamping head 2341. In this way, the five clamping heads set on the top can be hoisted and fixed, and when the adjusting bolt 239 is rotated, the distance between the upper and lower clamping heads will change, thereby achieving the adjustment of the thickness of the adhesive 235.

[0077] The apparatus for preparing an interface specimen 234 of composite propellant AP bonded to adhesive 235 according to an embodiment of the present invention, such as... Figure 1 and Figure 2 As shown: Pull rings 240 are provided on both the top plate 237 and the bottom plate 231;

[0078] The positioning plate includes: a first positioning plate 236 and a second positioning plate 232, wherein the first positioning plate 236 overlaps the upper surface of the second positioning plate 232;

[0079] It also includes a first demolding bracket 22 and a second demolding bracket 21, wherein the first demolding bracket 22 and the second demolding bracket 21 each have at least three supporting feet; the top plate 237 and the first positioning plate 236 are respectively provided with first clearance grooves along the height direction on both sides of the top plate 237 and the first positioning plate 236, and the bottom plate 231 and the second positioning plate 232 are respectively provided with second clearance grooves along the height direction on both sides of the bottom plate 231 and the second positioning plate 232, and the first clearance grooves and the second clearance grooves are not collinear in the length direction;

[0080] The support leg of the first demolding bracket 22 passes through the first clearance groove and abuts against the upper end surface of the second positioning plate 232; the support leg of the second demolding bracket 21 passes through the second clearance groove and abuts against the lower end surface of the first positioning plate 236.

[0081] In some embodiments, such as Figure 1 As shown, an interface specimen device body 23 is provided between the first demolding bracket 22 and the second demolding bracket 21; pull rings 240 are provided on both sides of the top plate 237 and the bottom plate 231; since the first clearance groove A2375 is opened on both sides of the length surface of the top plate 237 (see... Figure 5 The first clearance groove B (not shown in the figure) is formed on both sides of the length surface of the first positioning plate 236, and the second clearance groove A2312 (see Figure 3 The second clearance groove B2325 (see) is located on both sides of the length surface of the base plate 231. Figure 4The first avoiding slot is not collinear with the second avoiding slot in the length direction, so that the supporting leg of the first demolding support 22 penetrates the first avoiding slot (A, B) and presses against the upper end surface of the second positioning plate 232, and the supporting leg of the second demolding support 21 penetrates the second avoiding slot (A, B) and presses against the lower end surface of the first positioning plate 236 (see Figure 1 When the interface specimen device body 23 needs to be separated from the top plate 237 and the first positioning plate 236, the demolding support is only needed to be reversed, so that the first demolding support 22 is located below, and the above steps are repeated.

[0082] The embodiment of the present application also provides a preparation method of the interface specimen of the composite propellant AP and the adhesive, as shown in Figure 8 The preparation method comprises the following steps:

[0083] S1, preparing ammonium perchlorate tablets 2343;

[0084] S2, bonding the prepared ammonium perchlorate tablets 2343 to the head 2342 of the clamping head respectively;

[0085] S3, placing the bottom plate 231 flat, and placing the tail 2341 of the clamping head into the first installation hole 2311; then, stacking a second positioning plate 232 on the bottom plate 231, and coaxially arranging the first installation hole 2311 and the second installation hole 2322; then, placing the positioning ring 233 on the step 2323 arranged at the opening edge of the second installation hole 2322; and then, stacking the first positioning plate 236 on the second positioning plate 232;

[0086] S4, preparing the adhesive 235 mixture according to the propellant formula, and pouring the prepared adhesive 235 mixture into the positioning ring 233;

[0087] S5, inserting the tail 2341 of the prepared multiple groups of clamping heads into the third installation hole 2372 of the top plate 237 from bottom to top, and combining and installing the cover plate 238, the clamping head and the top plate 237 through the adjusting bolt 239, to form a combined body;

[0088] S6, install the head 2342 of the clamping head in the combination in the second mounting hole 2322 of the first positioning plate 236, so that the ammonium perchlorate tablet 2343 in the upper part is in contact with the adhesive 235 mixture;

[0089] S7, put the interface test piece 234 preparation device into the high temperature box for heating and curing, realize the interface curing and bonding of the adhesive 235 mixture and the ammonium perchlorate tablet 2343, and obtain the interface test piece 234.

[0090] According to the interface test piece preparation method of the composite propellant AP and the adhesive provided by the embodiment of the application, the S6 further comprises:

[0091] When the ammonium perchlorate tablet 2343 is in contact with the adhesive 235 mixture, the adjusting bolt 239 is rotated to adjust the distance between the upper and lower ammonium perchlorate tablets 2343.

[0092] In this step, the purpose of rotating the adjusting bolt 239 is to adjust the distance between the ammonium perchlorate tablets 2343, and then control the thickness of the cured adhesive 235.

[0093] According to the interface test piece preparation method of the composite propellant AP and the adhesive provided by the embodiment of the application, as shown in Figure 9 , the preparation of the ammonium perchlorate tablet comprises:

[0094] S101, obtain an ammonium perchlorate tablet preparation device, which comprises a base 11, a pressing cylinder 13, a lower pad 14 and an upper pad 16, and a pressing column 17, the pressing cylinder 13 is coaxially installed on the base 11, and a sealing ring 12 is arranged at the joint of the base 11 and the pressing cylinder 13; the pressing cylinder 13 has a pressing cavity in the axial direction, and the pressing column 17 is slidably installed in the pressing cavity, and the pressing cylinder 13 is provided with an exhaust passage in the radial direction (see Figure 10 );

[0095] S102, pull out the pressing column 17 from the pressing cavity, put the lower pad 14 into the pressing cavity, then put the ammonium perchlorate powder 15 on the lower pad 14, press the upper pad 16 on the ammonium perchlorate powder 15, and finally install the pressing column 17 into the pressing cavity;

[0096] S103, place the ammonium perchlorate tablet preparation device on the hydraulic machine platform to apply pressure according to a predetermined pressure curve;

[0097] In this step, the hydraulic machine platform applies Figure 11The shown predetermined pressure curve applies pressure, and after a certain time, the ammonium perchlorate tablet preparation device is taken out, and after demolding, the ammonium perchlorate tablet 2343 is obtained. The pressure curve adopts a step-by-step pressure curve, which gradually increases from 20KN to 80KN, with a step length of 20KN, and each pressure is maintained for 5 minutes. The step-by-step gradual pressure increasing mode is helpful to improve the strength, consistency and stability of the ammonium perchlorate tablet 2343.

[0098] S104, after the pressure is completed, the pressure is released, and the ammonium perchlorate tablet preparation device is taken out, and the ammonium perchlorate tablet 2343 is obtained after demolding.

[0099] Figure 12 The interface test piece 234 prepared by using the present application is used on a test bench, and a curve of tensile force-displacement amount thereof is obtained.

[0100] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An apparatus for preparing a composite propellant AP and binder interface specimen, characterized in that, include: The base plate has multiple first mounting holes arranged along its length and multiple first positioning stakes and first positioning holes arranged vertically along its height. The positioning plate has at least two oppositely arranged second mounting holes arranged along the length direction and multiple second positioning holes perpendicularly opened along the height direction; the diameter of the second mounting hole is larger than that of the first mounting hole, and the opening edges of the two oppositely arranged second mounting holes form a step and constitute a limiting ring groove; a positioning ring is embedded in the limiting ring groove; multiple positioning plates are arranged overlapping each other; The top plate is stacked on the upper surface of the positioning plate and has multiple third mounting holes arranged along the length direction, and multiple second positioning stakes and third positioning holes are arranged vertically along the height direction. The clamping head has at least two opposing parts, including a cylindrical head and a cylindrical tail, the head and the tail being coaxially fixedly connected, and an ammonium perchlorate sheet is fixedly attached to the end face of the head away from the tail. The head is movably installed in a second mounting hole that is opposite to each other, and the tail is movably installed in a first mounting hole and a third mounting hole that are opposite to each other. An adhesive is injected between the opposing ammonium perchlorate sheets. A cover plate, overlapping the upper end face of the top plate and connected to the tail of the clamping head, is used to provide space for the injection of the adhesive; The first positioning pile passes through the second positioning hole and the third positioning hole, and the second positioning pile passes through the first positioning hole and the second positioning hole.

2. The apparatus for preparing composite propellant AP and binder interface specimens according to claim 1, characterized in that, The cover plate has multiple limiting holes arranged along its length. The tail end face of the clamping head has a threaded hole coaxially opened. An adjusting bolt is threadedly connected to the threaded hole. The adjusting bolt passes through the limiting hole and engages with the threaded hole. The adjusting bolt can be limited to the limiting hole when rotating.

3. The apparatus for preparing composite propellant AP and binder interface specimens according to claim 2, characterized in that, Pull rings are provided on both the top plate and the bottom plate.

4. The apparatus for preparing composite propellant AP and binder interface specimens according to claim 3, characterized in that, The positioning plate includes: a first positioning plate and a second positioning plate, wherein the first positioning plate overlaps the upper surface of the second positioning plate; It also includes a first demolding bracket and a second demolding bracket, wherein the first demolding bracket and the second demolding bracket each have at least three supporting feet; the top plate and the two sides of the first positioning plate are respectively provided with a first clearance groove along the height direction, and the two sides of the bottom plate and the second positioning plate are respectively provided with a second clearance groove along the height direction, wherein the first clearance groove and the second clearance groove are not collinear in the length direction; The support leg of the first demolding bracket passes through the first clearance groove and presses against the upper end face of the second positioning plate; the support leg of the second demolding bracket passes through the second clearance groove and presses against the lower end face of the first positioning plate.

5. A method for preparing an interface specimen of a composite propellant AP and a binder, applicable to the interface specimen preparation apparatus as described in claim 4, the method comprising: S1. Preparation of ammonium perchlorate tablets; S2. Adhere the prepared ammonium perchlorate tablets to the heads of multiple clamping heads respectively; S3. Lay the base plate flat and insert the tail of the glued clamping head into the first mounting hole; then stack a second positioning plate on the base plate, making the first mounting hole and the second mounting hole coaxial; then place the positioning ring on the step opened at the edge of the second mounting hole opening; then stack the first positioning plate on the second positioning plate. S4. Prepare the adhesive mixture according to the propellant formula, and pour the prepared adhesive mixture into the positioning ring; S5. Insert the tails of the prepared multiple sets of clamping heads into the third mounting holes opened in the top plate from bottom to top, and combine and install the cover plate, clamping heads and top plate by adjusting the bolts to form a combined body; S6. Install the head of the clamping head in the assembly into the second mounting hole of the first positioning plate, so that the ammonium perchlorate press at the top contacts the adhesive mixture. S7. Place the assembled interface specimen preparation device into a high-temperature chamber for heating and curing to achieve interface curing and bonding between the adhesive mixture and the ammonium perchlorate tablet, thereby obtaining the interface specimen.

6. The method for preparing interface specimens of composite propellant AP and binder according to claim 5, characterized in that: S6 further includes: After the ammonium perchlorate tablets come into contact with the adhesive mixture, rotate the adjusting bolt to adjust the distance between the upper and lower ammonium perchlorate tablets.

7. The method for preparing interface specimens of composite propellant AP and binder according to claim 5, characterized in that: The preparation of ammonium perchlorate tablets includes: S101. Obtain an ammonium perchlorate tablet preparation apparatus, the apparatus comprising: a base, a pressure cylinder and a pressure column, the pressure cylinder being coaxially mounted on the base, and a sealing ring being provided at the mating point between the base and the pressure cylinder; the pressure cylinder having a pressure cavity along the axial direction, the pressure column being slidably mounted in the pressure cavity, and the pressure cylinder having an exhaust channel along the radial direction; S102. Pull the pressure column out of the pressure chamber, put the ammonium perchlorate powder into the pressure chamber, and install the pressure column into the pressure chamber. S103. Place the ammonium perchlorate tablet preparation device on the hydraulic press platform and apply pressure according to the predetermined pressure curve; S104. After pressurization is completed, release the pressure and remove the ammonium perchlorate tablet preparation device to obtain ammonium perchlorate tablets by demolding.

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