Floor coating tensile experiment equipment, tensile assembly and detection method thereof

Abstract

The invention belongs to the technical field of testing the strength characteristic of a solid material by using mechanical stress, particularly relates to floor coating tensile experiment equipment, a tensile assembly and a detection method thereof, and aims at the following defects existing in a traditional method: 1) a tensile rod is inconvenient to assemble and disassemble before and after an experiment; 2) the curing time of the binder is long; and (3) feeding and discharging operation is inconvenient, according to the scheme, a base is included, a portal frame is fixed to the top of the base, a hydraulic cylinder fixedly penetrates through the interior of the portal frame, a lifting frame is fixed to an output shaft of the hydraulic cylinder, the lifting frame slides in the portal frame, a pull rod is fixed to the bottom of the lifting frame, and a U-shaped frame is fixed to the bottom end of the pull rod. The clamping and releasing operation of the U-shaped frame and the stretching rod can be automatically completed through lifting of the U-shaped frame, the later experiment efficiency is greatly improved, and when the sample plate and the stretching rod are placed in the box body, curing of an adhesive between the sample plate and the stretching rod can be accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of testing the strength characteristics of solid materials by mechanical stress, and particularly relates to a tensile test device, a tensile component and a detection method for floor coatings. Background Art

[0002] As a functional floor material based on epoxy resin, compounded with pigments, solvents and curing agents, floor coatings achieve dust-proof, wear-resistant, anti-seepage and other protective performances by constructing a three-dimensional cross-linked network, and have been widely used in industrial factories, commercial exhibition halls, underground garages and other scenarios. In its quality control system, tensile tests, as a core detection method, can quantitatively evaluate key performance indicators such as the tensile strength and elongation at break of the coating.

[0003] During the production of floor coatings, tensile tests need to be carried out on them to detect the tensile strength of the coating, evaluate the elongation at break of the coating, predict the service life of the coating and control the construction quality.

[0004] The following deficiencies still exist in the prior art during the tensile test of floor coatings: 1. In the prior art, during the tensile test, it is necessary to connect the coating layer to the tensile rod through an adhesive, and then connect the tensile rod to the output shaft of the hydraulic cylinder for the subsequent tensile test by the hydraulic cylinder. However, the tensile rod needs to be installed and disassembled before and after the experiment, so it is relatively cumbersome and affects the subsequent detection of the coating. 2. During the tensile test, it is necessary to attach the coating sample to the fixing plate, and then bond the coating sample to the tensile rod through an adhesive. However, the curing process of the adhesive is very time-consuming and affects the efficiency of the entire coating experiment. 3. It is not convenient to load and unload materials during the experiment.

[0005] In view of the above problems, the present invention document proposes a tensile test device, a tensile component and a detection method for floor coatings. Summary of the Invention

[0006] The purpose of the present invention is to solve the disadvantages that the tensile rod needs to be installed and disassembled before and after the existing experiment, the curing process of the adhesive is time-consuming, and it is not convenient to load and unload materials, and to propose a tensile test device, a tensile component and a detection method for floor coatings.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions: A tensile component, comprising: A base; A gantry, vertically fixed on the top of the base; A hydraulic cylinder, fixedly penetrating through the top of the gantry; The lifting frame is rigidly connected to the output shaft of the hydraulic cylinder and is slidably fitted within the gantry; The U-shaped frame is suspended at the bottom of the lifting frame by a pull rod; The sample plate is detachably mounted on the top of the base and bears the coating sample; The tension rod is vertically fixed on the surface of the coating sample by an adhesive; The clamping structure includes guide rods symmetrically arranged on both sides of the U-shaped frame, trapezoidal plates slidably sleeved on the guide rods, and first tension springs sleeved on the outer walls of the guide rods; and The conical platform is fixedly sleeved on the outer wall of the tension rod and cooperates with the bottom inclined surface of the trapezoidal plate; Wherein, the trapezoidal plate forms a self-locking connection with the conical platform under the action of the first tension spring, realizing the automatic clamping and release of the tension rod.

[0008] As a further improvement of the above technical solution: The outer wall of the tension rod is slidably sleeved with a lifting wheel. The upper and lower end faces of the lifting wheel are provided with inclined surfaces that cooperate with the trapezoidal plate. The lifting wheel is located between the conical platform and the limit ring to form axial limitation.

[0009] Arc-shaped grooves are provided on both sides of the sample plate. An L-shaped plate that is fixedly connected to the top of the base and is in clamping cooperation with the arc-shaped grooves is provided. The axis of the protruding part of the L-shaped plate is in the same plane as the central axis of the sample plate.

[0010] A floor coating tensile test device includes the tensile assembly described in claim 3, and further includes: The box body is fixed on the top of the base and is provided with a sample accommodation cavity; The rotating shaft is rotatably connected between the base and the gantry through a deep groove ball bearing; The rotating arm is key-connected to the outer wall of the rotating shaft and is provided with a clamping groove that cooperates with the tension rod; The bonding structure includes a fixed rod that slidably penetrates the box body, a first pressing plate connected to the bottom end of the fixed rod, a second pressing plate connected to the top end of the fixed rod, and a first spring sleeved on the outer wall of the threaded rod; The feeding structure includes a lead screw arranged in the base, a first gear that is in threaded cooperation with the lead screw, and an incomplete bevel gear that is linked to the rotating shaft.

[0011] As a further improvement of the above technical solution: The bonding structure further includes an elastic rubber block embedded at the bottom of the first pressing plate, and a heating sheet provided on the side wall of the box body. The heating sheet is electrically connected to a temperature sensor.

[0012] The feeding structure further includes a U-shaped plate that is elastically connected to the lead screw, a third tension spring sleeved on the outer wall of the sliding rod, and a first bevel gear that is connected to the output shaft of the gearbox through a one-way bearing. The first bevel gear forms an intermittent meshing transmission with the incomplete bevel gear.

[0013] A limiting plate and a first stopper are provided at the top of the base. The limiting plates are arranged in parallel to form a sample guiding channel, and the first stopper is located at the end of the channel and perpendicular to the moving direction of the U-shaped plate.

[0014] It further includes an automatic discharging mechanism, which comprises: A rotating disk, fixedly connected to the output shaft of the gearbox and provided with bumps; A lifting plate, slidably sleeved on the outer wall of the fixed column and reset by a second spring; A push plate, detachably clamped with a trapezoidal plug through a sliding rod, and a second tension spring is sleeved on the outer wall of the sliding rod.

[0015] The rotating arm is provided with an L-shaped lever, and the bending angle of the L-shaped lever is tangent to the moving track of the sample plate; It further includes a second stopper, and the limiting surface of the second stopper is flush with the rotation end position of the rotating arm.

[0016] In this application, a detection method for a floor coating tensile test device includes the following steps: S1. Sample preparation and curing: Apply a multi-sample coating to the sample plate, apply an adhesive and bond the tensile rod after curing, place it in the box, ensure tight bonding by pressing with the first spring, heat to accelerate curing and monitor the temperature; S2. Automatic intermittent feeding: Drive the U-shaped plate to move the sample plate through the lead screw and the third tension spring. The incomplete bevel gear cooperates with the first bevel gear to achieve intermittent movement, and the sample plate is automatically fed into the gantry under the cooperation of the rotating arm, the card slot and the tensile rod; S3. Hydraulic tensile performance test: The hydraulic cylinder pushes the U-shaped frame to move downwards, the trapezoidal plate cooperates with the conical platform to move, and the tensile operation is completed. Record the breaking force and length to evaluate the coating performance; S4. Buckle release and reset preparation: After stretching, the U-shaped frame continues to move downwards and then upwards. The trapezoidal plate moves under the action of the lifting wheel to release the buckle of the tensile rod, facilitating the next batch of tests; S5. Transmission mechanism reset: The rotating arm rotates in the reverse direction, and the incomplete bevel gear rotates in the reverse direction synchronously and resets to the initial state; S6. Sample discharge: When the rotating arm rotates for feeding, the rotating disk and the bumps are synchronously driven to rotate, pushing the lifting plate and the trapezoidal plug downwards, releasing the sliding rod, and the second spring pushes the push plate to push out the tested sample plate and the tensile rod until the push plate resets and the trapezoidal plug brakes the sliding rod again.

[0017] Beneficial effects: In the present invention, the clamping structure includes two guide rods fixed on both sides of the U-shaped frame. Trapezoidal plates are slidably sleeved on the outer walls of the two guide rods. A tapered platform and a limit ring are fixedly sleeved on the outer wall of the stretching rod. A lifting wheel is slidably sleeved on the outer wall of the stretching rod between the tapered platform and the limit ring. Inclined surfaces are provided at the top and bottom of the lifting wheel. When the U-shaped frame moves downward, the inclined surface of the trapezoidal plate can cooperate with the inclined surface of the tapered platform to engage the trapezoidal plate with the tapered platform, facilitating the stretching of the stretching rod by the U-shaped frame. When the U-shaped frame moves upward after moving downward to the lower side of the lifting wheel, the engagement between the U-shaped frame and the stretching rod can be automatically released by the cooperation of the inclined surface at the bottom of the lifting wheel and the trapezoidal plate, thus enabling automatic buckling and unbuckling operations. In the present invention, the bonding structure includes a plurality of fixing rods slidably penetrating through the box body. The same first pressing plate located inside the box body is fixed to the bottom ends of the plurality of fixing rods. The same second pressing plate is fixed to the top ends of the plurality of fixing rods. A nut block is threadedly sleeved on the outer wall of the threaded rod. A first spring is provided between the nut block and the second pressing plate. A plurality of heating sheets are fixed to the inner walls of the two mutually remote sides of the box body. Pressure is applied to the stretching rod by the pressure exerted on the first pressing plate by the first spring, thereby enabling the stretching rod to be tightly bonded to the sample plate. Moreover, by rotating the nut block to control its lifting, the pressure exerted by the first spring on the second pressing plate and the stretching rod can be controlled. Then, the air inside the box body is heated by the heating sheets, thereby accelerating the curing of the adhesive. And the temperature sensor monitors the temperature in real time to avoid excessive temperature. In the present invention, one end of the lead screw is fixed with a U-shaped plate through a third tension spring. The output shaft of the gearbox is fixed with a second gear meshing with the first gear. An incomplete bevel gear is fixed to the bottom end of the rotating shaft. A first bevel gear is sleeved on the outer wall of the output shaft of the gearbox through a one-way bearing. The cooperation of the incomplete bevel gear with the first bevel gear, the second gear, and the first gear drives the lead screw to rotate, thereby driving the U-shaped plate to synchronously pull a plurality of sample plates to one side. When the incomplete bevel gear disengages from the first bevel gear, the cooperation of the rotating arm and the card slot moves the sample plate and the stretching rod into the gantry, completing the automatic feeding work. In the present invention, one end of the output shaft of the gearbox is fixed with a rotating disk. A plurality of bumps are fixedly sleeved on the outer wall of the rotating disk. A trapezoidal insertion plate is fixed to one side of the top of the lifting plate. A sliding rod is slidably penetrated through the first base plate. A push plate is fixed to the end of the sliding rod close to the U-shaped frame. A second base plate engaged with the trapezoidal insertion plate is provided at the bottom of the sliding rod. During the process that the rotating shaft drives the rotating arm to rotate and just clamp the stretching rod for feeding, the output shaft of the gearbox drives the rotating disk and the bumps to rotate, pushing the lifting plate and the trapezoidal insertion plate downward to release the braking of the sliding rod. The push plate pushes the sample plate and the stretching rod after the tensile test out of the base under the pulling force of the second tension spring, and the subsequent sample plate can push the push plate and the sliding rod to reset, facilitating the subsequent automatic pushing operation.

[0018] In the present invention, the buckling and unbuckling operations between the U-shaped frame and the stretching rod can be automatically completed through the lifting of the U-shaped frame, which greatly improves the experimental efficiency in the later stage. Moreover, when the sample plate and the stretching rod are placed in the box body, the curing of the binder between the sample plate and the stretching rod can be accelerated. In addition, the feeding and discharging are automatically completed during the reciprocating rotation of the rotating shaft and the rotating arm, without manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic diagram of the stretching assembly provided in Embodiment 1 of the present invention; Figure 2 It is a three-dimensional exploded structure schematic diagram of the U-shaped frame, the stretching rod and the sample plate of the stretching assembly provided in Embodiment 1 of the present invention; Figure 3 It is a three-dimensional structure schematic diagram of a floor coating tensile test device provided in Embodiment 1 of the present invention; Figure 4 It is a sectional structure schematic diagram of a floor coating tensile test device provided in Embodiment 1 of the present invention; Figure 5 It is a three-dimensional sectional exploded structure schematic diagram of the box body of a floor coating tensile test device provided in Embodiment 1 of the present invention; Figure 6 It is a three-dimensional structure schematic diagram of the cooperation between the rotating arm and the stretching rod of a floor coating tensile test device provided in Embodiment 1 of the present invention; Figure 7 It is a three-dimensional exploded structure schematic diagram of the rotating shaft, the card slot and the U-shaped plate of a floor coating tensile test device provided in Embodiment 1 of the present invention; Figure 8 It is a three-dimensional structure schematic diagram of a floor coating tensile test device provided in Embodiment 2 of the present invention; Figure 9 It is a three-dimensional sectional structure schematic diagram of the base of the connection structure of a floor coating tensile test device provided in Embodiment 2 of the present invention; Figure 10 It is a three-dimensional structure schematic diagram of the rotating disk, the lifting plate and the sliding rod of a floor coating tensile test device provided in Embodiment 2 of the present invention; Figure 11 It is a three-dimensional exploded structure schematic diagram of the sliding rod and the trapezoidal insertion plate of a floor coating tensile test device provided in Embodiment 2 of the present invention; Figure 12 It is a sectional schematic diagram of the sample plate of a floor coating tensile test device provided by the present invention.

[0020] In the figure: 1. Base; 2. Gantry; 3. Hydraulic cylinder; 4. Lifting frame; 5. Tie rod; 6. U-shaped frame; 7. Trapezoidal plate; 8. Guide rod; 9. First tension spring; 10. L-shaped plate; 11. Sample plate; 12. Arc groove; 13. Coating sample; 14. Tensile rod; 15. Conical platform; 16. Lifting wheel; 17. Limit ring; 18. Box body; 19. Fixed rod; 20. First pressing plate; 21. Second pressing plate; 22. Threaded rod; 23. First spring; 24. Nut block; 25. Rubber block; 26. Heating sheet; 27. Temperature sensor; 28. Second tension spring; 29. L-shaped lever; 30. Limit plate; 31. First stop block; 32. Rotating shaft; 33. Rotating arm; 34. Card slot; 35. Second stop block; 36. Cavity; 37. Lead screw; 38. Sliding rod; 39. Third tension spring; 40. U-shaped plate; 41. First gear; 42. Gearbox; 43. Second gear; 44. One-way bearing; 45. First bevel gear; 46. Incomplete bevel gear; 47. Lifting cavity; 48. Lifting plate; 49. Fixed column; 50. Second spring; 51. Rotating disk; 52. Convex block; 53. Trapezoidal plug board; 54. First substrate; 55. Slide bar; 56. Push plate; 57. Second substrate. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] Example 1: Refer to Figure 1 and Figure 2 , a stretching assembly, which relates to the technical field of coating experimental equipment. The stretching assembly includes a Q235 carbon steel base 1, and a 6061-T6 aluminum alloy gantry 2 is fixed on the top of the base 1 by bolts or other fastening methods. A hydraulic cylinder 3 is fixedly penetrated in the gantry 2, and the output shaft of the hydraulic cylinder 3 is fixedly connected to a lifting frame 4. Sliders matching the inner slide rails of the gantry 2 are provided on both sides of the lifting frame 4 to ensure that the lifting frame 4 can stably slide up and down in the gantry 2 under the drive of the hydraulic cylinder 3. A 304 stainless steel tie rod 5 is fixedly connected to the bottom of the lifting frame 4 by welding or other fastening methods, and a U-shaped frame 6 is fixed to the bottom end of the tie rod 5.

[0023] Refer to Figure 1 and Figure 2 , on the top of the base 1, a sample plate 11 is placed, and a coating sample 13 that needs to be subjected to a stretching test is coated on the top of the sample plate 11. A tensile rod 14 is connected to the top of the coating sample 13 through a specific adhesive, and this adhesive needs to ensure that the coating sample 13 and the tensile rod 14 will not separate during the stretching process.

[0024] Refer to Figure 1 and Figure 2In order to realize the automatic buckling and disengagement between the U-shaped frame 6 and the stretching rod 14, the present invention also designs a clamping structure. The clamping structure specifically includes two 45# steel chrome-plated guide rods 8 fixed on both sides of the U-shaped frame 6, and the outer walls of the two guide rods 8 are slidably sleeved with trapezoidal plates 7, and the trapezoidal plates 7 can slide stably on the guide rods 8. The ends of the two trapezoidal plates 7 close to each other are slid and extended into the U-shaped frame 6 for cooperation with the stretching rod 14. The outer walls of the two guide rods 8 are sleeved with first tension springs 9 fixedly connected to the U-shaped frame 6, and the two ends of the first tension spring 9 are respectively fixedly connected to the U-shaped frame 6 and the trapezoidal plates 7, providing the trapezoidal plates 7 with a pulling force to move toward the middle. The outer wall of the stretching rod 14 is fixedly sleeved with a GCr15 conical platform 15 and a limit ring 17, and the top inclined surface of the conical platform 15 cooperates with the bottom inclined surface of the trapezoidal plate 7.

[0025] Specifically, when the U-shaped frame 6 moves downward, the inclined surface of the trapezoidal plate 7 moves outward under the action of the inclined surface of the conical platform 15 until the trapezoidal plate 7 is located below the conical platform 15. At this time, under the tension of the first tension spring 9, the trapezoidal plate 7 extends toward the middle, and the top of the trapezoidal plate 7 is tightly matched with the bottom of the conical platform 15, so that the stretching rod 14 is pulled upward by the cooperation between the trapezoidal plate 7 and the conical platform 15.

[0026] Reference Figure 1 and Figure 2 In order to further realize the automatic release of the clamping, the outer wall of the stretching rod 14 is also slidably sleeved with a lifting wheel 16 located between the conical platform 15 and the limit ring 17. The top and bottom of the lifting wheel 16 are both provided with inclined surfaces, which cooperate with the inclined surfaces at the bottom of the trapezoidal plate 7.

[0027] Specifically, when the U-shaped frame 6 moves down to the bottom of the lifting wheel 16 and then moves up, the bottom inclined surface of the lifting wheel 16 can release the clamping connection between the trapezoidal plate 7 and the lifting wheel 16 and the conical platform 15, so as to facilitate the tensile test to be performed again later.

[0028] like Figure 12 In order to facilitate the fixing and replacement of the sample plate 11, arc grooves 12 are provided on both sides of the sample plate 11, and the center of the annular groove coincides with the central axis of the rotating shaft 32. Two Q235L-shaped plates 10 are fixed on the top of the base 1. The two L-shaped plates 10 are respectively located on both sides of the sample plate 11, and the raised parts of the L-shaped plates 10 match the arc grooves 12, so that the sample plate 11 is stably clamped on the base 1. This design not only facilitates the fixing of the sample plate 11, but also facilitates the subsequent tensile test of the coating sample 13 by the tensile rod 14.

[0029] Reference Figure 3 , Figure 4 and Figure 6, a floor coating tensile test device, including the above-mentioned tensile assembly, further includes a box body 18 fixed on the top of the base 1. Inside the box body 18, there is a space for placing multiple mutually bonded sample plates 11 and tensile rods 14. The rotating shaft 32 is rotationally connected to the base 1 and the gantry 2 through deep groove ball bearings. The rotating arm 33 is fixedly connected to the outer wall of the rotating shaft 32 by key connection. The rotating arm 33 is located below the limiting ring 17. Such a layout provides sufficient space for subsequent tensile operations. On one side of the rotating arm 33, there is a clamping groove 34, which closely cooperates with the rotating arm 33 and the tensile rod 14 to jointly drive the sample plate 11 and the tensile rod 14 to move, thereby realizing the automatic operation of the tensile test.

[0030] Refer to Figures 3 - 5 , in order to achieve a firm bond between the tensile rod 14 and the sample plate 11, a bonding structure is provided inside the device. The core of this structure includes multiple fixing rods 19 that slide through the box body 18. The bottom ends of these fixing rods 19 are jointly fixed with a first pressing plate 20 located inside the box body 18, whose function is to apply downward pressure to the tensile rod 14 to ensure its close contact with the sample plate 11. The top ends of the fixing rods 19 are fixed with a second pressing plate 21, located above the box body 18. A threaded rod 22 passing through the second pressing plate 21 is also fixed on the top of the box body 18. A nut block 24 is threadedly sleeved on the outer wall of the threaded rod 22. A 60Si2MnA first spring 23 (elastic coefficient 80N / mm) is provided between the nut block 24 and the second pressing plate 21. This spring is sleeved on the outer wall of the threaded rod 22 to provide a continuous downward thrust to the second pressing plate 21. In addition, a plurality of heating sheets 26 are fixed on the inner walls of the two sides of the box body 18 that are far away from each other, used to heat the air inside the box body 18 to accelerate the curing process of the adhesive. A PT100 temperature sensor 27 is also fixed on one inner wall of the box body 18 to monitor the temperature inside the box body 18 in real time and avoid the influence of too high temperature on the test.

[0031] Refer to Figure 3 , Figure 4 and Figure 7 , in order to further improve the automation degree of the device, a feeding structure is also integrated inside the device. This structure is arranged inside the base 1 and is composed of components such as a cavity 36, a second substrate 57, a lead screw 37, a sliding rod 38, a U-shaped plate 40, a third spring 39, a first gear 41, a gearbox 42, a second gear 43, a one-way bearing 44, a first bevel gear 45, and an incomplete bevel gear 46.

[0032] Refer to Figure 3 , Figure 4 and Figure 7, specifically, a second substrate 57 is fixed to the inner wall of the bottom of the cavity 36. A lead screw 37 is slidably penetrated through the second substrate 57. One end of the lead screw 37 is slidably connected to a sliding rod 38. One end of the sliding rod 38 is fixed with a U-shaped plate 40. The top end of the U-shaped plate 40 extends above the base 1 and is used to synchronously pull multiple sample plates 11 to one side. A third tension spring 39 is fixed between the U-shaped plate 40 and the lead screw 37, and the third tension spring 39 is sleeved on the outer wall of the sliding rod 38 to provide a pulling force to the U-shaped plate 40 to one side. A first gear 41 is rotatably connected to the side of the second substrate 57 away from the U-shaped plate 40, and the first gear 41 is threadedly connected to the lead screw 37. A transmission 42 is fixed to the inner wall of the top of the cavity 36. An output shaft of the transmission 42 is fixed with a second gear 43 that meshes with the first gear 41. The bottom end of the rotating shaft 32 extends into the cavity 36 and is fixed with an incomplete bevel gear 46. A one-way bearing 44 is sleeved on the outer wall of the output shaft of the transmission 42. The inner ring of the one-way bearing 44 cooperates with the outer wall of the output shaft of the transmission 42, and the outer ring is fixedly sleeved with a first bevel gear 45, and the first bevel gear 45 intermittently meshes with the incomplete bevel gear 46.

[0033] Specifically, when the teeth in the incomplete bevel gear 46 mesh with the first bevel gear 45, it will drive the one-way bearing 44 to rotate. The one-way bearing 44 is locked and connected to the output shaft of the transmission 42, and then drives the second gear 43 to rotate through the transmission 42. The second gear 43 then drives the lead screw 37 to rotate through the first gear 41. The lead screw 37 is threadedly connected to the second substrate 57. Therefore, during rotation, it will drive the U-shaped plate 40 to move through the pulling force of the third tension spring 39, and the U-shaped plate 40 will synchronously pull multiple sample plates 11 to one side. When the teeth in the incomplete bevel gear 46 disengage from the first bevel gear 45, the leftmost stretching rod 14 just snaps into the card slot 34 in the rotating arm 33. As the rotating arm 33 rotates, the sample plate 11 and the stretching rod 14 are moved into the gantry 2, and at the same time, the L-shaped plate 10 just extends into the arc-shaped slot 12 to clamp the sample plate 11, thus completing the automatic feeding operation.

[0034] Refer to Figure 3 and Figure 6 , a second stop block 35 is fixedly arranged on the top of the base 1. The top end of the second stop block 35 is fixedly connected to one side bottom of the gantry 2, so that the second stop block 35 is stably supported between the gantry 2 and the base 1. The main function of the second stop block 35 is to limit the rotating arm 33 to ensure that it can accurately stop at a predetermined position during rotation. An L-shaped lever 29 is fixed to the side of the rotating arm 33 away from the card slot 34. The design of the L-shaped lever 29 enables effective support for the sample plate 11 when the rotating arm 33 drives the stretching rod 14 to move, preventing it from tilting or falling off due to the stretching force.

[0035] Refer to Figure 5, in order to ensure the bonding quality between the stretching rod 14 and the sample plate 11, a plurality of rubber blocks 25 are fixedly embedded at the bottom of the first pressing plate 20. These rubber blocks 25 have good elasticity and can apply uniform pressure to the top end of the stretching rod 14 when the first pressing plate 20 is pressed down. Especially when the heights of the plurality of stretching rods 14 are different, the elasticity of the rubber blocks 25 can enable each stretching rod 14 to receive appropriate pressure, thus ensuring the firmness of the bond.

[0036] Referring to Figure 5 , on the top of the base 1, two limiting plates 30 located inside the box body 18 are also fixedly installed. These two limiting plates 30 firmly limit the sample plate 11 inside them to prevent it from displacing during the experiment. In addition, a first stop block 31 located inside the box body 18 is fixedly installed on the top of the base 1. The first stop block 31 is located on the side of the limiting plate 30 close to the rotating shaft 32, and its main function is to limit the leftmost sample plate 11. When the U-shaped plate 40 moves, it can synchronously push a plurality of sample plates 11 to move to one side, while the limiting plate 30 can ensure that the sample plate 11 remains horizontal during the movement and avoid tilting. The limiting effect of the first stop block 31 on the sample plate 11 enables the rotating arm 33 to accurately snap the stretching rod 14 into the card slot 34 when rotating, thus completing the operation of transporting the stretching rod 14 into the stretching assembly.

[0037] In summary, the floor coating stretching experiment device realizes the automatic operation of the floor coating stretching test by integrating key components such as a stretching assembly, a bonding structure, and a feeding structure, improving the test efficiency and accuracy.

[0038] Embodiment 2: Refer to Figure 11 and Figure 12 Referring to Figures 8 - 11, in order to realize the automatic ejection of the sample plate 11 and the stretching rod 14 after the experiment, a lifting cavity 47 is provided inside the base 1. One end of the output shaft of the gearbox 42 extends into the lifting cavity 47 and is fixed with a rotating disc 51. A plurality of bumps 52 are fixedly sleeved on the outer wall of the rotating disc 51. A plurality of fixed columns 49 are fixed inside the lifting cavity 47, and the outer walls of the plurality of fixed columns 49 are slidably sleeved with the same lifting plate 48. A plurality of 50CrVA second springs 50 (elastic coefficient 30 N / mm) are fixed between the bottom of the lifting plate 48 and the inner wall of the bottom of the lifting cavity 47. These second springs 50 are sleeved on the outer walls of the fixed columns 49 and are mainly used to drive the lifting plate 48 to move upward. A first substrate 54 is fixed on the top of the base 1. A sliding rod 55 is slidably penetrated through the first substrate 54. One end of the sliding rod 55 close to the U-shaped frame 6 is fixed with a push plate 56 for ejecting the stretching rod 14 and the sample plate 11 after the stretching test from the base 1. A second substrate 57 that engages with the trapezoidal plug 53 is provided at the bottom of the sliding rod 55. A second tension spring 28 is sleeved on the outer wall of the sliding rod 55. The two ends of the second tension spring 28 are respectively hooked on the fixed pins of the sliding rod 55 and the first substrate 54 to provide power for the movement of the push plate 56.

[0039] When the output shaft of the gearbox 42 drives the rotating disc 51 and the bumps 52 to rotate, the bumps 52 will touch the lifting plate 48 and push the lifting plate 48 and the trapezoidal plug 53 downward. The trapezoidal plug 53 was originally engaged in the second substrate 57 at the bottom of the sliding rod 55. When moving downward, it will disengage from the second substrate 57, thus releasing the braking of the sliding rod 55. At this time, under the pulling force of the second tension spring 28, the sliding rod 55 will push the push plate 56 to move toward the middle, and eject the sample plate 11 and the stretching rod 14 after the stretching test from the base 1.

[0040] When the rotating arm 33 transports the stretching rod 14 to the lower part of the U-shaped frame 6, the rotating arm 33 and the L-shaped lever 29 cooperate to apply a thrust force to the stretching rod 14 and the sample plate 11 synchronously until the sample plate 11 pushes the push plate 56 to reset. At this time, under the elastic force of the second spring 50, the trapezoidal plug 53 will be reinserted into the second substrate 57 to complete the braking of the sliding rod 55. Such a design facilitates the later ejection operation of the sample plate 11 and the stretching rod 14 after the experiment, improving the automation degree and experimental efficiency of the equipment.

[0041] A detection method for a floor coating stretching experiment device includes the following steps: S1. Coat the tops of the sample plates 11 with coating samples 13 of multiple different varieties respectively. After the coating samples 13 solidify, apply an adhesive on the tops of the coating samples 13 and bond them to the bottom of the tension rod 14 through the adhesive. Place the sample plate 11 bonded to the tension rod 14 in the box body 18 and between the two limiting plates 30. Multiple sample plates 11 are arranged in sequence within the two limiting plates 30. Apply pressure to the tension rod 14 through the pressure exerted on the first pressing plate 20 by the first spring 23, so as to enable the tension rod 14 to be tightly bonded to the sample plate 11. And by rotating the nut block 24 to control its lifting, the pressure exerted by the first spring 23 on the second pressing plate 21 and the tension rod 14 can be controlled. Then heat the air in the box body 18 through the heating sheet 26 to accelerate the curing of the adhesive, and the temperature sensor 27 monitors the temperature in real time to avoid too high temperature; S2. When feeding is required, the motor drives the incomplete bevel gear 46 to rotate through the rotating shaft 32. The teeth in the incomplete bevel gear 46 mesh with the first bevel gear 45 to drive the one-way bearing 44 to rotate. The one-way bearing 44 is locked and connected to the output shaft of the gearbox 42. Thus, the second gear 43 can be driven to rotate through the gearbox 42. The second gear 43 drives the lead screw 37 to rotate through the first gear 41. The lead screw 37 is threadedly connected to the second substrate 57. The lead screw 37 drives the U-shaped plate 40 to move under the pulling force of the third tension spring 39. The U-shaped plate 40 pulls multiple sample plates 11 synchronously to one side. When the teeth in the incomplete bevel gear 46 disengage from the first bevel gear 45, the tension rod 14 located on the leftmost side just snaps into the card slot 34 in the rotating arm 33. Thus, as the rotating arm 33 rotates, the sample plate 11 and the tension rod 14 can be moved into the gantry 2, and at the same time, the L-shaped plate 10 just extends into the arc-shaped groove 12 to clamp the sample plate 11, completing the automatic feeding operation; S3. The output shaft of the hydraulic cylinder 3 drives the U-shaped frame 6 to move downward through the cooperation of the lifting frame 4 and the pull rod 5. The inclined surface of the trapezoidal plate 7 moves outward under the cooperation of the inclined surface of the conical platform 15 until the trapezoidal plate 7 is located below the conical platform 15, and then extends toward the middle under the pulling force of the first tension spring 9. The top of the trapezoidal plate 7 cooperates with the bottom of the conical platform 15. The hydraulic cylinder 3 drives the U-shaped frame 6 to move upward at a constant speed to complete the stretching operation. During the stretching process, record the stretching force and the stretching length when the coating sample 13 breaks, which is convenient for later judging the performance of the coating sample 13; S4. After the tensile test is completed, the U-shaped frame 6 continues to move downward. After the tensile rod 14 is repositioned on the sample plate 11, the U-shaped frame 6 continues to move downward. The inclined surface at the bottom of the trapezoidal plate 7 moves outward under the action of the inclined surface at the top of the lifting wheel 16. When the trapezoidal plate 7 moves below the lifting wheel 16, the U-shaped frame 6 starts to move upward. At this time, the trapezoidal plate 7 drives the lifting wheel 16 to move upward. And under the limit of the tapered platform 15, the lifting wheel 16 remains stationary. As the U-shaped frame 6 continues to move upward, the trapezoidal plate 7 moves outward under the action of the inclined surface at the bottom of the lifting wheel 16. At this time, the U-shaped frame 6 drives the trapezoidal plate 7 to move upward above the tapered platform 15, releasing the clamping connection between the U-shaped frame 6 and the tensile rod 14, facilitating the tensile test on the next batch of coating samples 13 in the later stage; S5. After the feeding in step S2 is completed, the rotating shaft 32 drives the rotating arm 33 to rotate in the reverse direction, and the incomplete bevel gear 46 rotates synchronously in the reverse direction. The teeth in the incomplete bevel gear 46 mesh with the first bevel gear 45 and drive the first bevel gear 45 to rotate in the reverse direction. The first bevel gear 45 and the one-way bearing 44 are in an active state until the rotating shaft 32, the rotating arm 33, and the incomplete bevel gear 46 are reset; S6. In addition, when step S2 is running, during the process that the rotating shaft 32 drives the rotating arm 33 to rotate and just clamp the tensile rod 14 for feeding, the output shaft of the gearbox 42 drives the rotating disk 51 and the convex block 52 to rotate. The convex block 52 touches and pushes the lifting plate 48 and the trapezoidal plug board 53 to move downward (the angle of rotation of the incomplete bevel gear 46 after meshing with the first bevel gear 45 can synchronously drive the rotating disk 51 to rotate synchronously, and each time it rotates, the convex block 52 can squeeze the lifting plate 48 and then disengage from the extrusion of the lifting plate 48). The trapezoidal plug board 53 disengages from the second base plate 57 and releases the braking of the sliding rod 55. The sliding rod 55 pushes the push plate 56 to move toward the middle under the pulling force of the second tension spring 28, which is used to push out the sample plate 11 and the tensile rod 14 after the tensile test from the base 1. When the rotating arm 33 transports the tensile rod 14 below the U-shaped frame 6, the rotating arm 33 and the L-shaped lever 29 cooperate to apply a thrust force to the tensile rod 14 and the sample plate 11 synchronously until the sample plate 11 pushes the push plate 56 to reset. The trapezoidal plug board 53 is reinserted into the second base plate 57 under the elastic force of the second spring 50, completing the braking of the sliding rod 55, facilitating the pushing out of the sample plate 11 and the tensile rod 14 after the experiment in the later stage.

[0042] However, as is well known to those skilled in the art, the working principles and wiring methods of the temperature sensor 27, the heating sheet 26, and the hydraulic cylinder 3 are common knowledge, and they all belong to conventional means or well-known common sense, so they will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0043] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention should cover within the protection scope of the present invention by making equivalent substitutions or changes according to the technical solution and inventive concept of the present invention.

Claims

1. A stretching assembly, characterized in that: include: Base (1); A gantry (2) is vertically fixed on the top of the base (1); A hydraulic cylinder (3) is fixedly mounted through the top of the gantry (2); A lifting frame (4) is rigidly connected to the output shaft of the hydraulic cylinder (3) and is slidably fitted in the gantry (2); A U-shaped frame (6) is suspended at the bottom of the lifting frame (4) via a pull rod (5); A sample plate (11) is detachably mounted on the top of the base (1) and carries a coating sample (13); A stretching rod (14) is vertically fixed to the surface of the coating sample (13) by means of an adhesive; The clamping structure comprises guide rods (8) symmetrically arranged on both sides of the U-shaped frame (6), a trapezoidal plate (7) slidably sleeved on the guide rods (8), and a first tension spring (9) sleeved on the outer wall of the guide rods (8); and A conical platform (15) is fixedly sleeved on the outer wall of the stretching rod (14) and cooperates with the bottom inclined surface of the trapezoidal plate (7); Wherein, the trapezoidal plate (7) forms a self-locking connection with the conical platform (15) under the action of the first tension spring (9), thereby realizing automatic clamping and release of the stretching rod (14).

2. The stretching assembly according to claim 1, characterized in that: The outer wall of the stretching rod (14) is slidably sleeved with a lifting wheel (16), and the upper and lower end surfaces of the lifting wheel (16) are provided with inclined surfaces that cooperate with the trapezoidal plate (7). The lifting wheel (16) is located between the conical platform (15) and the limiting ring (17) to form an axial limit.

3. The stretching assembly according to claim 1, characterized in that: Arc grooves (12) are provided on both sides of the sample plate (11), an L-shaped plate (10) is fixed on the top of the base (1) and is engaged with the arc groove (12), and the axis of the raised portion of the L-shaped plate (10) is aligned with the central axis of the sample plate (11).

4. A floor coating tensile test device, comprising the tensile assembly according to claim 3, characterized in that Also includes: A box body (18) is fixed to the top of the base (1) and is provided with a sample receiving cavity; The rotating shaft (32) is rotatably connected between the base (1) and the gantry (2) via a deep groove ball bearing; A rotating arm (33) is key-connected to the outer wall of the rotating shaft (32) and is provided with a slot (34) that cooperates with the stretching rod (14); The bonding structure comprises a fixing rod (19) slidingly penetrating the box body (18), a first pressing plate (20) connected to the bottom end of the fixing rod (19), a second pressing plate (21) connected to the top end of the fixing rod (19), and a first spring (23) sleeved on the outer wall of the threaded rod (22); The feeding structure comprises a lead screw (37) arranged in a base (1), a first gear (41) threadably matched with the lead screw (37), and an incomplete bevel gear (46) linked to a rotating shaft (32).

5. The floor coating tensile test equipment according to claim 4, characterized in that: The bonding structure further comprises an elastic rubber block (25) embedded in the bottom of the first pressing plate (20), and a heating plate (26) arranged on the side wall of the box body (18), wherein the heating plate (26) is electrically connected to the temperature sensor (27).

6. The floor coating tensile test equipment according to claim 5, characterized in that: The feeding structure further comprises a U-shaped plate (40) elastically connected to the lead screw (37), a third tension spring (39) sleeved on the outer wall of the sliding rod (38), and a first bevel gear (45) connected to the output shaft of the gearbox (42) via a one-way bearing (44), wherein the first bevel gear (45) forms an intermittent meshing transmission with the incomplete bevel gear (46).

7. The floor coating tensile test equipment according to claim 6, characterized in that: A limiting plate (30) and a first stopper (31) are provided on the top of the base (1); the limiting plates (30) are arranged in parallel to form a sample guide channel; and the first stopper (31) is located at the end of the channel and is perpendicular to the movement direction of the U-shaped plate (40).

8. The floor coating tensile test equipment according to claim 7, characterized in that: It also includes an automatic unloading mechanism, including: A rotating disk (51) fixedly connected to an output shaft of a gearbox (42) and provided with a protrusion (52); A lifting plate (48) is slidably sleeved on the outer wall of the fixed column (49) and reset by a second spring (50); The push plate (56) is releasably connected to the trapezoidal plug plate (53) via a slide bar (55), and a second tension spring (28) is sleeved on the outer wall of the slide bar (55).

9. The floor coating tensile test equipment according to claim 8, characterized in that: The rotating arm (33) is provided with an L-shaped lever (29), and the bending angle of the L-shaped lever (29) is tangent to the moving track of the sample plate (11); It also includes a second stopper (35), wherein a limiting surface of the second stopper (35) is flush with a rotation termination position of the rotating arm (33).

10. A detection method using a floor coating tensile test device as claimed in claim 9, characterized in that: The following steps are involved: S1. Sample preparation and curing: Apply multiple sample coatings to the sample plate (11), apply adhesive and bond the sample plate (14) after curing, place the sample plate in the box (18), apply pressure through the first spring (23) to ensure tight bonding, heat to accelerate curing and monitor the temperature; S2, automatic intermittent loading: the U-shaped plate (40) is driven by the lead screw (37) and the third tension spring (39) to move the sample plate (11), the incomplete bevel gear (46) cooperates with the first bevel gear (45) to realize intermittent motion, and the sample plate (11) is sent into the gantry (2) for automatic loading with the cooperation of the rotating arm (33), the slot (34) and the stretching rod (14); S3, hydraulic tensile performance test: the hydraulic cylinder (3) pushes the U-shaped frame (6) downward, and the trapezoidal plate (7) moves with the conical table (15) to complete the tensile operation, and the fracture strength and length are recorded to evaluate the coating performance; S4, buckle release and reset preparation: after stretching, the U-shaped frame (6) continues to move downward and then upward, and the trapezoidal plate (7) moves under the action of the lifting wheel (16), releasing the buckle of the stretching rod (14) to facilitate the next batch test; S5, the transmission mechanism is reset: the rotating arm (33) rotates in the reverse direction, and the incomplete bevel gear (46) rotates in the reverse direction synchronously, and resets to the initial state; S6. Sample discharge: When the rotating arm (33) rotates to load the material, the rotating disk (51) and the protrusion (52) are synchronously driven to rotate, pushing the lifting plate (48) and the trapezoidal insert plate (53) downward, releasing the slide bar (55), and the second spring (50) pushes the push plate (56) to push out the sample plate (11) and the stretching rod (14) after the test until the push plate (56) is reset and the trapezoidal insert plate (53) brakes the slide bar (55) again.

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