A pull-out test head and tensile force detection device

Abstract

This utility model relates to the technical field of tensile bond strength testing of adhesives, and particularly to a pull-out test head and tensile force detection device, including a pull-out head and a pull-out die. The pull-out die includes a die body, which is fixedly connected to the lower end of the pull-out head. The die body has a cavity for filling the adhesive inside, and a first opening communicating with the cavity is provided at the end of the die body away from the pull-out head. The inner diameter of the cavity gradually decreases in the direction away from the pull-out head. When the pull-out test head is used to determine the tensile bond strength, the bonding interface between the adhesive and the ceramic tile sample is preferentially destroyed, accurately obtaining the tensile bond strength between the adhesive and the ceramic tile sample, thereby judging the bonding performance between the adhesive and the ceramic tile sample. This solves the problem that existing pull-out test devices cannot accurately control the initial destruction of the bonding interface between the adhesive and the ceramic tile, and cannot accurately evaluate the bonding performance between the ceramic tile and the adhesive.

Description

Technical Field

[0001] This utility model relates to the technical field of testing the tensile bond strength of adhesives, and in particular to a pull-out test head and a tensile force detection device. Background Technology

[0002] Adhesives are substances with good bonding properties that can firmly bond two interfaces together. They are widely used in industries such as electronic packaging and building materials. For example, when ceramic tile adhesives are used to lay ceramic tiles, they can firmly bond the ceramic tiles to the wall or floor. If the bonding performance between the ceramic tile and the adhesive is insufficient, it can easily lead to problems such as hollowing and falling off after the ceramic tiles are laid. To solve the problem of hollowing and falling off, when developing ceramic tiles, researchers generally design concave and convex patterns on the laying surface of the ceramic tile to increase the contact area between the ceramic tile and the adhesive and improve the bonding strength.

[0003] In the prior art, the bonding performance of adhesives can be evaluated by measuring tensile bond strength (which is the maximum destructive force that a unit bonded area can withstand under a tensile force perpendicular to the adhesive layer or bonding interface): a pull-out test device is used to apply a vertical tensile force to the ceramic tile bonded with adhesive until the bonding interface between the adhesive and the ceramic tile is destroyed, thereby measuring the tensile bond strength of the adhesive and evaluating the overall bonding performance between the adhesive and the ceramic tile.

[0004] In practical applications, when evaluating the impact of different patterns or sizes on the surface of ceramic tiles on the bonding performance between ceramic tiles and adhesives, researchers need to accurately know the maximum tensile force when the bonding interface between ceramic tiles and adhesives is destroyed when measuring tensile bond strength.

[0005] However, current pull-out testing devices can only measure the tensile bond strength of test samples with a ceramic tile-adhesive-substrate board structure (the substrate board is generally the material of the wall or floor corresponding to the ceramic tile, such as a concrete slab). In this test sample, there are separate bonding interfaces between the adhesive and the ceramic tile, and between the adhesive and the substrate board. When measuring the tensile bond strength, the pull-out testing device is fixedly connected to the ceramic tile or substrate board to apply a vertical tensile force to the test sample. During the tensile process, the bonding interface between the adhesive and the ceramic tile may be destroyed first, or the bonding interface between the adhesive and the substrate board may be destroyed first, or the internal structure of the adhesive may be destroyed. It is impossible to accurately control whether the bonding interface between the adhesive and the ceramic tile is destroyed first. In other words, existing pull-out testing devices cannot accurately obtain the maximum tensile force when the bonding interface between the ceramic tile and the adhesive is destroyed, and therefore cannot accurately evaluate the bonding performance between the ceramic tile and the adhesive. Utility Model Content

[0006] The main objective of this invention is to provide a pull-out test head that, when determining tensile bond strength, can preferentially disrupt the bonding interface between the adhesive and the ceramic tile sample within the pull-out test head, accurately obtaining the tensile bond strength between the adhesive and the ceramic tile sample, thereby determining the bonding performance between the adhesive and the ceramic tile sample. This solves the problem that existing pull-out test devices cannot accurately control the preferential disruption of the bonding interface between the adhesive and the ceramic tile, thus failing to accurately evaluate the bonding performance between the ceramic tile and the adhesive.

[0007] Another objective of this invention is to provide a tensile testing device that, when measuring tensile bond strength, can preferentially destroy the bonding interface between the adhesive in the pull-out test head and the ceramic tile sample, accurately obtain the tensile bond strength between the adhesive and the ceramic tile sample, and thus determine the bonding performance between the adhesive and the ceramic tile sample.

[0008] To achieve the above objectives, the present invention proposes a pull-out test head, comprising a pull-out head and a pull-out die, wherein the pull-out die is fixedly connected to the pull-out head; the pull-out die includes a die body portion, which is fixedly connected to the lower end of the pull-out head; the die body portion has a cavity for filling adhesive inside, and a first opening is provided at the end of the die body portion away from the pull-out head, the first opening communicating with the die cavity; the inner diameter of the die cavity gradually decreases in the direction away from the pull-out head.

[0009] Optionally, the mold body portion has a second opening at one end away from the first opening, and the second opening, the mold cavity, and the first opening are connected in communication; the drawing head includes a cover plate, the cover plate is detachably connected to the mold body portion, and the cover plate completely covers the second opening.

[0010] Optionally, the drawing die further includes a connecting portion; one end of the connecting portion is fixedly connected to the outer peripheral wall of the die body, the other end of the connecting portion extends horizontally along the radial direction of the die body, and the connecting portion is located at the end of the die body near the cover plate; the upper end face of the connecting portion is detachably connected to the lower end face of the cover plate.

[0011] Optionally, the pull head further includes a bolt; the cover plate has a first threaded hole, the connecting part has a second threaded hole corresponding to the first threaded hole, and the bolt, the first threaded hole and the second threaded hole are arranged in a one-to-one correspondence; the bolt passes through the first threaded hole and the second threaded hole in sequence to fix the cover plate and the connecting part together.

[0012] Optionally, the drawing head further includes an isolation film; the isolation film is detachably disposed between the cover plate and the mold body; the upper end face of the isolation film is in contact with the lower end face of the cover plate, the lower end face of the isolation film is in contact with the upper end face of the connecting part, and the isolation film completely covers the second opening.

[0013] Optionally, the drawing head further includes a drawing portion, one end of which is fixedly connected to the upper end face of the cover plate, and the other end of which protrudes from the cover plate in a direction away from the mold body portion.

[0014] Optionally, the outer peripheral wall of the mold body is provided with a moisture-removing groove, which is connected to the mold cavity.

[0015] Optionally, a plurality of dehumidification grooves are provided, and the plurality of dehumidification grooves are evenly distributed along the circumferential direction of the outer peripheral wall of the mold body.

[0016] Optionally, the shape of the mold body is a hollow frustum.

[0017] This utility model also proposes a tensile testing device, including the pull-out test head described in any one of the above-mentioned embodiments. The tensile testing device includes a frame, a CNC system, a drive component, and a clamping platform. The clamping platform is mounted on the frame, and the drive component is located on the upper side of the clamping platform. The drive component is electrically connected to the CNC system. The fixed end of the drive component is fixedly connected to the frame, and the drive end of the drive component is fixedly connected to the pull-out head. The drive component is used to provide a vertical tensile force to the pull-out head to destroy the bonding interface between the adhesive in the pull-out test head and the ceramic tile sample.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention, by setting a mold cavity inside the mold body, allows the adhesive to be filled into the mold cavity when preparing the overall test sample. Since the inner diameter of the mold cavity gradually decreases away from the drawing head, when measuring the tensile bond strength, the friction between the inner peripheral wall of the mold body and the adhesive gradually increases as the drawing head and drawing die are pulled upwards using a tensile testing device. This allows the tensile force to primarily act on the bonding interface between the adhesive and the ceramic tile sample, thus enabling the bonding interface between the adhesive and the ceramic tile sample to be preferentially destroyed. This allows for accurate determination of the maximum tensile force at which the bonding interface between the ceramic tile sample and the adhesive is destroyed, and thus accurately obtains the tensile bond strength between the adhesive and the ceramic tile sample. This solves the problem that existing pull-out testing devices cannot accurately control the initial destruction of the bonding interface between the adhesive and the ceramic tile, thus failing to accurately evaluate the bonding performance between the ceramic tile and the adhesive. Attached Figure Description

[0020] Figure 1 This is a structural cross-sectional view of a pull-out test head and a ceramic brick sample according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the pull-out test head according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a pull-out test head according to an embodiment of the present invention;

[0023] Figure 4 This is a front view of a pull-out test head according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the pull-out die of the pull-out test head according to another embodiment of the present invention;

[0025] Figure 6 This is a cross-sectional view of the pull-out test head according to another embodiment of the present invention.

[0026] In the attached figures: 1. Pull-out test head; 11. Pull-out head; 111. Cover plate; 1111. First threaded hole; 112. Pull-out section; 1121. Mounting hole; 12. Pull-out die; 121. Die body; 1211. Die cavity; 1212. First opening; 1213. Second opening; 1214. Dehumidification groove; 122. Connecting part; 1221. Second threaded hole; 2. Ceramic brick sample. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a fixed connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] To resolve the above technical issues, please refer to [link / reference]. Figures 1 to 3 This utility model proposes a pull-out test head, including a pull-out head 11 and a pull-out die 12, wherein the pull-out die 12 is fixedly connected to the pull-out head 11;

[0032] The drawing die 12 includes a die body 121, which is fixedly connected to the lower end of the drawing head 11;

[0033] The mold body 121 has a cavity 1211 for filling adhesive inside, and a first opening 1212 is provided at one end of the mold body 121 away from the drawing head 11. The first opening 1212 is connected to the cavity 1211.

[0034] The inner diameter of the mold cavity 1211 gradually decreases in the direction away from the drawing head 11.

[0035] For more specific details, please refer to [link / reference]. Figure 1 When preparing the overall test sample for determining tensile bond strength, adhesive is filled and applied to the surface of the ceramic tile sample 2 (containing a textured pattern), and then the mold cavity 1211 is filled with adhesive. The end of the mold body 121 away from the pull-out head 11 is attached to the surface of the ceramic tile sample 2, so that the ceramic tile sample 2 can completely cover the first opening 1212 (specifically, the pull-out test head 1 can be placed upside down, that is, the first opening 1212 of the mold cavity 1211 is placed upwards, and the mold cavity 1211 is filled with adhesive). After applying the adhesive, the surface of the ceramic tile sample 2 is placed over the first opening 1212. Then, the ceramic tile sample 2 and the pull-out test head 1 are reversed so that the first opening 1212 of the mold cavity 1211 faces downwards and covers the ceramic tile sample 2. The adhesive in the mold cavity 1211 is bonded to the surface of the ceramic tile sample 2 through the first opening 1212, thereby making the pull-out mold 12 and the ceramic tile sample 2 fit tightly together, thus preparing the overall test sample after the pull-out test head 1 and the ceramic tile sample 2 are bonded together.

[0036] It should be noted that, as Figure 1 As shown, when using the pull-out test head 1 to evaluate the effect of different patterns or sizes on the bonding performance between the ceramic tile sample 2 and the adhesive on the surface of the ceramic tile sample 2, the first opening 1212 needs to completely cover at least one set of complete patterns on the surface of the ceramic tile sample 2.

[0037] It should be noted that the pull-out head 11 is used to connect to an external tensile testing device (such as a tensile strength testing machine). The tensile testing device provides a vertically upward tensile force to the overall test sample (it can be understood that the tensile force is perpendicular to the ceramic tile sample 2), which causes the bonding interface between the ceramic tile sample 2 and the adhesive to be destroyed.

[0038] Under certain test conditions, after the adhesive has completely solidified, the tensile bond strength is determined (the test conditions can be formulated with reference to parts 7.2 and 7.11 of standard JC / T 547-2017 "Ceramic Wall and Floor Tile Adhesives", or can be flexibly formulated according to customer requirements or R&D needs). By using the tensile testing device, a load of a certain rate is applied to the pull-out head 11 until the bonding interface between the adhesive and the ceramic tile sample 2 is destroyed, thereby obtaining the total tensile load when the bonding interface between the adhesive and the ceramic tile sample 2 is destroyed. The tensile bond strength is obtained by calculating the total tensile load and dividing it by the bonding area.

[0039] This invention, by setting a mold cavity 1211 inside the mold body 121, allows the adhesive to be filled into the mold cavity 1211 when preparing the overall test sample. Since the inner diameter of the mold cavity 1211 gradually decreases away from the drawing head 11, when measuring the tensile bond strength, the friction between the inner peripheral wall of the mold body 121 and the adhesive gradually increases when the tensile testing device pulls the drawing head 11 and the drawing die 12 upwards. This allows the tensile force to primarily act on the bonding interface between the adhesive and the ceramic tile sample 2, thereby achieving bonding between the adhesive and the ceramic tile sample 2. The bonding interface between the ceramic tile sample 2 and the adhesive is destroyed first (the bonding interface between the inner peripheral wall of the mold part 121 and the adhesive is destroyed later due to the increased friction, which allows it to withstand greater tensile force). This allows for accurate determination of the maximum tensile force when the bonding interface between the ceramic tile sample 2 and the adhesive is destroyed, which in turn allows for accurate determination of the tensile bond strength between the adhesive and the ceramic tile sample 2. This enables the determination of the bonding performance between the adhesive and the ceramic tile sample 2, thus solving the problem that existing pull-out testing devices cannot accurately control the bonding interface between the adhesive and the ceramic tile to be destroyed first, thereby failing to accurately evaluate the bonding performance between the ceramic tile and the adhesive.

[0040] Please see Figure 2 Furthermore, the mold body 121 has a second opening 1213 at the end away from the first opening 1212, and the second opening 1213, the mold cavity 1211 and the first opening 1212 are connected and configured.

[0041] The drawing head 11 includes a cover plate 111, which is detachably connected to the mold body 121, and the cover plate 111 completely covers the second opening 1213.

[0042] By providing the second opening 1213 and detachably connecting the cover plate 111 to the mold part 121, when preparing the overall test sample, after filling and scraping the adhesive on the laying surface of the ceramic tile sample 2, the mold part 121 can be placed on the ceramic tile sample 2 first, and then the adhesive can be filled into the mold cavity 1211 through the second opening 1213. Finally, the cover plate 111 and the mold part 121 are fixed.

[0043] To further explain, after the adhesive is filled into the mold cavity 1211 through the second opening 1213, the cover plate 111 can be connected to the mold body 121 after the adhesive has completely solidified. By setting the second opening 1213, ventilation can be provided to promote the evaporation of moisture or solvent in the adhesive.

[0044] Please see Figure 2 and Figure 3 Furthermore, the drawing die 12 also includes a connecting portion 122;

[0045] One end of the connecting part 122 is fixedly connected to the outer peripheral wall of the mold part 121, and the other end of the connecting part 122 extends horizontally along the radial direction of the mold part 121, and the connecting part 122 is located at the end of the mold part 121 near the cover plate 111.

[0046] The upper end face of the connecting part 122 is detachably connected to the lower end face of the cover plate 111.

[0047] The connection part 122 facilitates the installation and disassembly of the drawing head 11 and the drawing die 12.

[0048] Specifically, the connecting part 122 and the pulling head 11 can be fixed by means of threaded connection or snap-fit ​​connection.

[0049] Furthermore, the pull-out test head 1 also includes a clamp, which can be configured as a G-clamp. The clamp is used to clamp the pull-out test head 1 and the ceramic tile sample 2 during the preparation of the overall test sample, so that during the curing process of the adhesive, the pull-out test head 1 can be prevented from being arbitrarily displaced, thus affecting the bonding effect between the adhesive and the ceramic tile sample 2.

[0050] Please see Figures 2 to 5 Furthermore, the pull-out head 11 also includes a bolt;

[0051] The cover plate 111 has a first threaded hole 1111, and the connecting part 122 has a second threaded hole 1221 corresponding to the first threaded hole 1111. The bolt, the first threaded hole 1111 and the second threaded hole 1221 are provided in a one-to-one correspondence.

[0052] The bolt passes through the first threaded hole 1111 and the second threaded hole 1221 in sequence to fix the cover plate 111 and the connecting part 122 together.

[0053] By providing the first threaded hole 1111, the second threaded hole 1221, and the bolt (not shown in the figure), it is convenient to install and disassemble the drawing head 11 and the drawing die 12.

[0054] To further explain, the first threaded hole 1111, the second threaded hole 1221, and the number of bolts are respectively provided in multiples, which helps to increase the connection stability between the puller and the drawing die 12.

[0055] Furthermore, the drawing head 11 also includes an isolation film; the isolation film is detachably disposed between the cover plate 111 and the mold body portion 121;

[0056] The upper end face of the isolation film is attached to the lower end face of the cover plate 111, the lower end face of the isolation film is attached to the upper end face of the connecting part 122, and the isolation film completely covers the second opening 1213.

[0057] Specifically, when preparing the overall test sample, after the adhesive is filled and scraped onto the laying surface of the ceramic tile sample 2, the mold part 121 is placed on the laying surface of the ceramic tile sample 2, and then the adhesive is filled into the mold cavity 1211 through the second opening 1213. Then, the isolation film (not shown in the figure) is placed on the second opening 1213 to isolate the adhesive and the cover plate 111. Finally, the cover plate 111 is fixedly connected to the mold part 121, so that the isolation film is pressed between the cover plate 111 and the connecting part 122.

[0058] Since the curing process of the adhesive requires a certain amount of time, the adhesive is easily contaminated by external pollutants (such as dust, grease and other impurities) in the early stage of curing, which affects its curing effect and bonding performance. In order to avoid the adhesive being interfered with by external pollutants in the early stage of curing, it is generally necessary to cure the adhesive in a closed space. However, in the later stage of curing, the closed space will prevent the moisture or solvent in the adhesive from being discharged, which will also affect the bonding performance of the adhesive. Therefore, when preparing the overall test sample, after the adhesive has initially cured (at this time, the adhesive can form a relatively stable state after initial curing, which can prevent dust, grease and other contaminants from entering the interior of the adhesive and affecting the curing effect and bonding performance), the cover plate 111 can be opened and the isolation film removed to continue curing the adhesive (the curing conditions and curing time can be formulated with reference to parts 7.2 and 7.11 of standard JC / T547-2017 "Ceramic Wall and Floor Tile Adhesives"), so that the adhesive can accelerate the evaporation of moisture or solvent through the second opening 1213, ensuring the curing effect and bonding strength of the adhesive. The tensile bond strength is then measured after the adhesive has completely solidified.

[0059] By setting the isolation film, which is used to isolate the cover plate 111 and the adhesive in the mold cavity 1211, it is possible to prevent the cover plate 111 from sticking to the adhesive when the adhesive is initially cured, and to prevent the cover plate 111 from being unable to be opened smoothly when the adhesive needs to be cured.

[0060] Specifically, the initial curing time is approximately one week, and the specific initial curing time can be determined according to different types of adhesives.

[0061] Furthermore, the material of the isolation film is PE plastic film; furthermore, the thickness of the isolation film is ≤0.1mm.

[0062] Please see Figure 3 Furthermore, the pulling head 11 also includes a pulling part 112, one end of which is fixedly connected to the upper end face of the cover plate 111, and the other end of which protrudes from the cover plate 111 in a direction away from the mold body part 121.

[0063] By providing the pulling part 112, it is convenient for operators to pick up the pulling head 11.

[0064] To further explain, the upper end face of the pulling part 112 is provided with a mounting hole 1121, which is used to fix the pulling head 11 to the external tensile testing device so as to fix the pulling head 11 to the tensile testing device.

[0065] Please see Figure 4 and Figure 5 Furthermore, the outer peripheral wall of the mold body 121 is provided with a moisture-removing groove 1214, which is connected to the mold cavity 1211.

[0066] By initiating the dehumidification groove 1214 on the outer peripheral wall of the mold part 121, the moisture or solvent in the adhesive can evaporate through the dehumidification groove 1214 during the curing process, which helps to accelerate the curing process of the adhesive and ensure the curing and bonding effect of the adhesive.

[0067] To further explain, in order to ensure that the cavity 1211 is completely filled with the adhesive, a slightly excessive amount of adhesive is generally loaded when filling the adhesive. When the pull-out test head 1 of this utility model is placed on the paving surface of the ceramic tile sample 2, the excess adhesive can be discharged from the dehumidification groove 1214.

[0068] Please see Figure 4 and Figure 5 Furthermore, the number of the dehumidification grooves 1214 is provided in multiples, and the multiple dehumidification grooves 1214 are evenly distributed along the circumferential direction of the outer peripheral wall of the mold body 121.

[0069] In one embodiment of this utility model, such as Figure 4 As shown, the dehumidification groove 1214 is disposed at the end of the mold body portion 121 away from the cover plate 111. Optionally, the dehumidification groove 1214 is configured to communicate with the first opening 1212.

[0070] In another embodiment of this utility model, such as Figure 5 As shown, the dehumidification groove 1214 is circular and is formed on the outer peripheral wall of the mold body 121.

[0071] By setting multiple dehumidification tanks 1214, it is helpful to accelerate the evaporation of moisture or solvent in the adhesive, thereby further accelerating the curing process of the adhesive.

[0072] Please see Figure 5 Furthermore, the shape of the mold part 121 is a hollow frustum.

[0073] Specifically, the mold body 121 is hollow and frustum-shaped, and the mold cavity 1211 is also frustum-shaped, so that the inner diameter of the mold cavity 1211 can gradually decrease in the direction away from the drawing head 11. When measuring the tensile bond strength, when the tensile testing device is used to pull the drawing head 11 and the drawing die 12 upward, the friction between the inner peripheral wall of the mold body 121 and the adhesive will gradually increase, so that the tensile force can mainly act on the bonding interface between the adhesive and the ceramic tile sample 2. This can achieve the priority destruction of the bonding interface between the adhesive and the ceramic tile sample 2, solving the problem that the existing tensile testing device cannot accurately control the bonding interface between the adhesive and the ceramic tile to be destroyed first, and cannot accurately obtain the maximum tensile force when the bonding interface between the ceramic tile and the adhesive is destroyed.

[0074] Specifically, the shape of the mold part 121 can be set as a hollow frustum or a hollow truncated cone.

[0075] Please see Figure 5 and Figure 6 In one embodiment of this utility model, the shape of the mold body 121 is a hollow frustum, the diameter φ3 of the first opening 1212 ranges from 100mm to 250mm, and the diameter φ2 of the second opening 1213 ranges from φ3+4mm to φ3+6mm; please refer to Figure 5 and Figure 6 In one embodiment of this utility model, the connecting part 122 is annular, the diameter φ1 of the inner ring of the connecting part 122 ranges from φ3+6mm to φ3+8mm, and the diameter φ of the outer ring of the connecting part 122 is φ = φ1 + 40mm; the height D of the mold body 121 ranges from 10mm to 20mm, and the vertical height d between the lower end face of the connecting part 122 and the lower end face of the mold body 121 is d = 0.5D. Please refer to [link / reference]. Figure 4 In another embodiment of this utility model, the length L1 of the dehumidification groove 1214 is 10mm, the height h of the dehumidification groove 1214 is 1mm, and the distance L2 between two adjacent dehumidification grooves 1214 is in the range of 5mm to 10mm.

[0076] It should be noted that the dimensions of the mold body 121 and the connecting part 122 can also be customized according to actual needs.

[0077] This utility model also provides a tensile testing device, including the pull-out test head described in any one of the above, wherein the tensile testing device includes a frame, a CNC system, a drive component and a clamping platform;

[0078] The clamping platform is mounted on the frame, the drive component is located on the upper side of the clamping platform, and the drive component is electrically connected to the CNC system;

[0079] The fixed end of the driving component is fixedly connected to the frame, and the driving end of the driving component is fixedly connected to the pull-out head 11. The driving component is used to provide a vertical pulling force to the pull-out head 11 so as to destroy the bonding interface between the adhesive in the pull-out test head 1 and the ceramic brick sample 2.

[0080] To further explain, the clamping platform includes a platform plate and a clamping member. The platform plate is fixedly connected to the frame, and the clamping member is detachably connected to the platform plate. The platform plate is used to place the overall test sample during the measurement, and the clamping member is used to clamp the ceramic brick sample 2 in the overall test sample.

[0081] In use, first prepare the overall test sample. After the adhesive has initially cured, open the cover plate 111 and remove the isolation film to continue curing the adhesive (the curing conditions and curing time can be formulated with reference to parts 7.2 and 7.11 of standard JC / T 547-2017 "Ceramic Wall and Floor Tile Adhesives"). After the adhesive has completely solidified, reinstall and fix the cover plate 111 to the mold part 121, and then determine the tensile bond strength according to the test conditions in part 7.11 of standard JC / T547-2017 "Ceramic Wall and Floor Tile Adhesives".

[0082] When determining the tensile bond strength, the overall test sample is placed on the platform plate and the ceramic tile sample 2 in the overall test sample is clamped by the clamping member. The driving end of the driving component is fixedly connected to the pulling part 112 of the pulling head 11. The driving component is started to apply a load at a certain rate to the pulling head 11 (refer to part 7.11 of standard JC / T 547-2017 "Ceramic Wall and Floor Tile Adhesives" to apply a load at a rate of (250±50) N / s to the pulling head 11) until the bonding interface between the adhesive and the ceramic tile sample 2 is destroyed. The total tensile load when the bonding interface between the adhesive and the ceramic tile sample 2 is destroyed is obtained, and the tensile bond strength is calculated.

[0083] To further explain, the driving end of the driving component is fixedly connected to the mounting hole 1121 of the pulling part 112. Specifically, the inner peripheral wall of the mounting hole 1121 is provided with an internal thread, and the outer peripheral wall of the driving end of the driving component is provided with an external thread. The driving end of the driving component is threadedly connected to the mounting hole 1121. Specifically, the driving component is a hydraulic cylinder.

[0084] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A pull test head characterized by, It includes a drawing head and a drawing die, wherein the drawing die is fixedly connected to the drawing head; The drawing die includes a die body, which is fixedly connected to the lower end of the drawing head; The mold body has a cavity for filling adhesive inside, and a first opening is provided at the end of the mold body away from the drawing head, and the first opening is connected to the mold cavity; The inner diameter of the mold cavity gradually decreases in the direction away from the drawing head.

2. The pull testing head of claim 1, wherein, The mold body part has a second opening at the end away from the first opening, and the second opening, the mold cavity and the first opening are connected in a continuous manner; The drawing head includes a cover plate, which is detachably connected to the mold body and completely covers the second opening.

3. The pull testing head of claim 2, wherein, The drawing die also includes a connecting part; One end of the connecting part is fixedly connected to the outer peripheral wall of the mold part, and the other end of the connecting part extends horizontally along the radial direction of the mold part, and the connecting part is located at the end of the mold part near the cover plate. The upper end face of the connecting part is detachably connected to the lower end face of the cover plate.

4. The pull testing head of claim 3, wherein, The pull-out head also includes a bolt; The cover plate is provided with a first threaded hole, the connecting part is provided with a second threaded hole corresponding to the first threaded hole, and the bolt, the first threaded hole and the second threaded hole are provided in a one-to-one correspondence; The bolts pass through the first threaded hole and the second threaded hole in sequence to fix the cover plate and the connecting part together.

5. The pull testing head of claim 3, wherein, The drawing head also includes an isolation film; the isolation film is detachably disposed between the cover plate and the mold body; The upper end face of the isolation film is attached to the lower end face of the cover plate, the lower end face of the isolation film is attached to the upper end face of the connecting part, and the isolation film completely covers the second opening.

6. The pull testing head of claim 2, wherein, The drawing head also includes a drawing part, one end of which is fixedly connected to the upper end face of the cover plate, and the other end of which protrudes from the cover plate in a direction away from the mold body.

7. The pull-out test head according to claim 2, characterized in that, The outer peripheral wall of the mold body is provided with a moisture-removing groove, which is connected to the mold cavity.

8. The pull-out test head according to claim 7, characterized in that, The number of dehumidification grooves is provided in multiple ways, and the multiple dehumidification grooves are evenly distributed along the circumferential direction of the outer peripheral wall of the mold body.

9. The pull-out test head according to claim 2, characterized in that, The shape of the mold body is a hollow frustum.

10. A tensile testing device, comprising a pull-out test head as described in any one of claims 1 to 9, characterized in that, The tensile testing device includes a frame, a CNC system, a drive component, and a clamping platform; The clamping platform is mounted on the frame, the drive component is located on the upper side of the clamping platform, and the drive component is electrically connected to the CNC system; The fixed end of the driving component is fixedly connected to the frame, and the driving end of the driving component is fixedly connected to the pull-out head. The driving component is used to provide a vertical pulling force to the pull-out head so as to destroy the bonding interface between the adhesive in the pull-out test head and the ceramic brick sample.

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