Concrete tensile detection experimental device

Abstract

The invention discloses a concrete tensile detection experiment device, which comprises an experiment box body and an experiment test piece, a support device is erected at the upper port of the experiment box body, and the support device comprises a support rail, and a support frame and a transmission rod which are arranged at the middle part of the support rail; the supporting frame, the transmission rod and the supporting rail are in transmission connection with a stretching device, a protection mechanism is installed on one side wall in the experiment box body and is in transmission connection with the transmission rod, and a cleaning mechanism in transmission connection with the protection mechanism is further arranged on the side, close to the protection mechanism, of the upper end of a bottom plate in the experiment box body. A discharging opening is formed in the side wall, opposite to the protection mechanism, of the experiment box body, a discharging mechanism is arranged at the discharging opening, and the discharging mechanism is in transmission connection with the transmission rod, so that the splashing risk is prevented, and automatic experiment waste cleaning is achieved.

Description

Technical Field

[0001] This invention relates to the field of materials testing equipment technology, specifically to a concrete tensile testing experimental device. Background Technology

[0002] Concrete is an artificial stone material formed by mixing cementitious materials, aggregates, water, and admixtures in a certain proportion and then hardening it. It is one of the most core materials in modern construction engineering. The cementitious material is mainly cement. For different building types with different heights, sizes, and scales, different mixing ratios of materials are required to formulate suitable concrete for different building groups. When formulating a new concrete material, it is necessary to conduct experiments on its tensile strength, impact resistance, and other resistances to ensure that the strength of the concrete formulated in that proportion is sufficient for use in a certain type of building. Therefore, conducting experiments on concrete with a certain proportion before it is fully launched is an important means to ensure safe use.

[0003] In existing technologies, equipment for testing the tensile strength of concrete typically uses only a tensile device to stretch the concrete specimen in two different directions. For example, Chinese invention patent application number 202210736619.3 uses two opposing tensile devices to manually fix the concrete specimen and pull it in opposite directions. However, if the concrete specimen breaks during the pulling process, the tensile strength at which it breaks is not the tensile strength threshold that the concrete specimen can withstand. The tensile strength threshold that the concrete specimen can withstand is only determined when the tensile device stretches the concrete specimen completely to the point of breakage. Therefore, when testing each type of concrete specimen, it is necessary to stretch it to the point of breakage to obtain the withstand threshold of that proportion of concrete. The fragments that fly when the concrete breaks can easily cause injury to the surrounding environment or laboratory personnel at the moment of breakage if no preventive measures are taken. Targeted preventive measures are required. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a concrete tensile testing device to solve the technical issues raised in the background section.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A concrete tensile testing apparatus includes a test chamber and a test specimen. A support device is mounted on the upper end of the test chamber. The support device includes a support rail, a support frame and a transmission rod disposed in the middle of the support rail. A tensile device is drivenly connected to the support frame, the transmission rod and the support rail. A protective mechanism is installed on one side wall of the test chamber and is drivenly connected to the transmission rod. A cleaning mechanism is also provided on the upper end of the bottom plate of the test chamber near the protective mechanism and is drivenly connected to the protective mechanism. A discharge port is opened on the side wall of the test chamber opposite to the protective mechanism, and a discharge mechanism is provided at the discharge port and is drivenly connected to the transmission rod.

[0006] Furthermore, the support rails are horizontally mounted at the upper opening of the experimental box. There are two support rails, which are parallel and symmetrically arranged. A rail groove is opened in the middle of the support rails. One end of each support rail extends outward at an angle, and the extended ends of the two support rails form a V-shaped structure.

[0007] Furthermore, there are two support frames, which are erected parallel to each other between the middle of the two inner walls of the experimental chamber and parallel to the two support rails. The transmission rod is rotatably erected between the middle of the two inner walls of the experimental chamber and placed at the lower end between the two support frames. The transmission rod is arranged parallel to the two supports respectively, and one end of the transmission rod is coaxially connected to a drive motor.

[0008] Furthermore, the stretching device includes a support base, which is disposed at the upper port of the experimental chamber and positioned between the extended ends of two support rails. The upper end of the support base has a T-shaped placement groove. It also includes a base with three mounting holes at its front and rear ends. The three mounting holes correspond to two support rods and one transmission rod, respectively. The support rods and the transmission rod are both disposed within the mounting holes. The inner wall of one of the mounting holes for fixing the transmission rod is provided with a thread adapted to the transmission rod.

[0009] Furthermore, the upper left and right sides of the base are provided with fixed shafts that are vertically arranged on the upper surface of the base. Each fixed shaft is provided with a swingable pull rod. Each pull rod is fixed with an inwardly opening gripper at the end away from the fixed shaft. The openings of the two grippers are arranged opposite each other. Each gripper has a protruding locking piece at the lower end. The locking piece is slidably arranged in the track groove of the support track.

[0010] Furthermore, the protection mechanism includes limiting blocks disposed on the inner walls of both sides of the end face opposite to the discharge port. A drive shaft is rotatably disposed between the two limiting blocks. Both ends of the drive shaft are provided with transmission gears for the cleaning mechanism. Limiting grooves are also formed on the surface of the limiting blocks. The limiting grooves are Y-shaped. A connecting piece one is fixedly disposed at one end of the drive shaft. A connecting piece two is axially connected to the other end of the connecting piece one. Limiting posts protrude from both ends of the inner side of the connecting piece two. The two limiting posts are slidably disposed in the limiting groove. A Z-shaped connecting rod is axially connected to the end of the connecting piece two away from the connecting piece one. A baffle is fixedly connected to the end of the connecting rod away from the connecting piece two. A balance bar is also fixedly connected between the two connecting pieces two.

[0011] Furthermore, the cleaning mechanism includes guide rails corresponding to the lower ends of the two transmission gears and placed on the upper surface of the bottom plate of the experimental chamber. The guide rails are L-shaped, and chains are slidably arranged inside the guide rails. The chains are meshed with the transmission gears. A push rod is mounted between the ends of the two chains away from the transmission gears. A brush head is provided at the lower end of the push rod. A transmission belt is sleeved between the outer end of the drive shaft and the transmission rod.

[0012] Furthermore, the cleaning mechanism includes a first bevel gear fixedly installed at both ends of the transmission rod inside the experimental chamber, a vertically conductive and rotatable transmission shaft installed at the lower end of the two bevel gears and installed on the bottom plate of the experimental chamber, a second bevel gear meshing with the first bevel gear at the top of the transmission shaft, and the lower end of the transmission shaft extending to the outer end of the experimental chamber.

[0013] Furthermore, the cleaning mechanism also includes two discharge wheels located at the discharge port. The two discharge wheels are rotatably mounted on the bottom plate of the experimental chamber, and a transmission belt is sleeved between the discharge wheels and the transmission shaft.

[0014] Furthermore, the experimental specimen is an I-shaped specimen formed by the solidification and cooling of concrete.

[0015] The present invention has the following beneficial effects: This invention sets the support rail for moving the tensioning device in a Y-shape. Before starting the equipment, the two pull rods of the tensioning device are located at the extension end of the support rail and are in an open state. After the test specimen is placed in the placement slot, the equipment is started. The base is driven by the transmission rod to move away from the placement slot. The gripper retracts along the rail and automatically clamps the test specimen, completing the automatic clamping and reducing manual fixing work.

[0016] When the transmission rod rotates, it drives the drive shaft to rotate via the transmission belt. The drive shaft, through the connecting piece, pulls the connecting piece 2 to move in a Y-shape within the limiting groove. Finally, the Z-shaped connecting rod pulls the baffle and covers the upper end of the experimental chamber to prevent splashing when the experimental specimen breaks. At the same time, when the drive shaft rotates, the transmission gear on the drive shaft pulls the chain to move towards one side wall of the experimental chamber, causing the push rod to retract. When the experiment ends, the push rod is pushed back to its original position according to the reverse rotation of the transmission gear, pushing the concrete fragments splashed in the experimental chamber to the discharge mechanism. The rotation of the transmission rod drives the discharge mechanism to work, thereby agitating and discharging the material pushed by the push rod out of the experimental chamber to complete the cleaning and prevent the gravel from clogging the discharge buckle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the experimental chamber structure in the device of the present invention; Figure 3 This is a schematic diagram of the tensioning device in the equipment of the present invention; Figure 4 This is another schematic diagram of the overall device of the present invention.

[0018] The diagram is labeled as follows: 1. Experimental chamber; 101. Discharge port; 2. Support rail; 201. Rail groove; 3. Placement groove; 301. Base; 302. Mounting hole; 303. Fixed shaft; 4. Pull rod; 401. Clamp; 402. Clip; 5. Support frame; 501. Transmission rod; 502. Drive motor; 503. Bevel gear one; 504. Transmission belt one; 6. Limiting block; 601. Limiting groove; 602. Drive shaft; 603. Transmission gear; 604. Connecting piece one; 605. Connecting piece two; 606. Balance bar; 607. Connecting rod; 608. Baffle; 7. Bevel gear two; 701. Transmission shaft; 702. Discharge wheel; 703. Transmission belt two; 8. Guide rail; 801. Chain; 802. Push rod; 803. Brush head; 9. Experimental specimen. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In existing technologies, concrete tensile testing equipment typically uses only two opposing tensioning devices to apply unidirectional tension to the specimen. When the specimen breaks, the resulting debris poses a safety hazard to the experimental environment and personnel. Traditional equipment lacks protective measures for the moment of breakage, and the debris cleanup process relies on manual operation, affecting experimental efficiency and continuity. For example, existing devices require shutdown to handle debris after specimen breakage, making it impossible to achieve a continuous operation of testing and cleanup. Example 1: Combination Figure 1 , 23. A concrete tensile testing experimental device, comprising an experimental chamber 1 and an experimental specimen 9. A support device is mounted on the upper end of the experimental chamber 1. The support device includes a support rail 2, a support frame 5 and a transmission rod 501 disposed in the middle of the support rail 2. A tensile device is drivenly connected to the support frame 5, the transmission rod 501 and the support rail 2. A protective mechanism is installed on one side wall inside the experimental chamber 1. The protective mechanism is drivenly connected to the transmission rod 501. A cleaning mechanism is also provided on the upper end of the bottom plate inside the experimental chamber 1 near the protective mechanism. A discharge port 101 is opened on the side wall opposite to the protective mechanism of the experimental chamber 1. A discharge mechanism is provided at the discharge port 101. The discharge mechanism is drivenly connected to the transmission rod 501. When the transmission rod 501 rotates, it drives the tensile device to apply tensile force to the specimen. When the transmission rod 501 rotates, it triggers the baffle 608 of the protective mechanism to close for protection. During the unfolding of the baffle 608, the pusher of the cleaning mechanism moves via the connecting rod 607, pushing the debris along the guide rail 8 to the discharge port 101. The discharge wheel 702 is linked to the transmission rod 501 via a transmission belt, continuously discharging the debris accumulated at the discharge port 101 from the housing. All mechanisms are synchronized through the transmission rod 501, completing the entire process of testing, protection, and cleaning under a single power source.

[0023] As a further technical solution in this embodiment, in conjunction with 1 and 3, the support rail 2 is horizontally mounted at the upper opening of the experimental chamber 1. There are two support rails 2, which are parallel and symmetrically arranged. A track groove 201 is provided in the middle of each support rail 2. One end of each support rail 2 extends outward at an angle, forming a V-shaped structure between the extended ends. The two parallel support rails 2 are symmetrically installed at the edge of the opening of the experimental chamber 1, guiding the clamping component of the tensile device along a predetermined path via the track groove 201. When a tensile test is performed, the gripper 401 moves along the support rail 2 and retracts through the V-shaped structure path to clamp the experimental specimen 9, achieving automated clamping.

[0024] As a further technical solution in this embodiment, combined with Figure 3Two support frames 5 are installed parallel to each other between the two inner walls of the experimental chamber 1 and parallel to the two support rails 2. A transmission rod 501 is rotatably installed between the two inner walls of the experimental chamber 1 and positioned at the lower end between the two support frames 5. The transmission rod 501 is parallel to each of the two supports, and one end of the transmission rod 501 is coaxially connected to a drive motor 502. The two support frames 5 are laterally fixed to the middle of the inner walls on both sides of the experimental chamber 1, forming a stable load-bearing structure. The transmission rod 501 is installed at the lower position between the support frames 5 via bearings, and its axis is parallel to the support frames 5. The drive motor 502 is installed at the end of the transmission rod 501 and directly drives the transmission rod 501 to rotate via a coupling. During the tensile test, the rotational motion of the transmission rod 501 is converted into the linear motion of the tensile device through a threaded connection. The parallel arrangement of the support frames 5 effectively constrains the radial displacement of the transmission rod 501, preventing equipment vibration caused by uneven force.

[0025] As a further technical solution in this embodiment, combined with Figure 3 The tensile device includes a support base, which is located at the upper port of the experimental chamber 1 and between the extended ends of two support rails 2. The upper end of the support base has a T-shaped placement groove 3. It also includes a base 301, which has three mounting holes 302 at its front and rear ends. The three mounting holes 302 are respectively set for two support rods and one transmission rod 501. The support rods and the transmission rod 501 are both connected to the mounting holes 302. The inner wall of one of the mounting holes 302 for fixing the transmission rod 501 is provided with a thread adapted to the transmission rod 501. The support base vertically positions the experimental specimen 9 through the T-shaped placement groove 3. The base 301 is sleeved on the support rails 2 and the transmission rod 501 through the three mounting holes 302 respectively. When the transmission rod 501 rotates, the base 301 moves along the support rails 2 and drives the gripper 401 to apply tensile force to the specimen. The transmission rod 501 is connected to the base 301 by a thread to ensure the efficiency of the transmission of tensile force and to prevent the transmission rod 501 from shifting due to uneven force during the stretching process.

[0026] As a further technical solution in this embodiment, combined with Figure 3The base 301 has two fixed shafts 303 vertically mounted on its upper surface on both the left and right sides. Each fixed shaft 303 has a swingable pull rod 4. At the end of each pull rod 4 furthest from the fixed shaft 303, an inwardly opening gripper 401 is fixedly mounted. The openings of the two grippers 401 are opposite each other. A locking element 402 protrudes from the lower end of each gripper 401 and is slidably mounted within the track groove 201 of the support rail 2. When the stretching device is running, the drive motor 502 drives the base 301 to move along the support rail 2 via the transmission rod 501. The fixed shafts 303 act as a fulcrum, causing the pull rods 4 to swing, which in turn causes the grippers 401 to close and clamp towards the specimen. The anti-slip texture on the inner side of the grippers 401 increases the friction with the concrete specimen, and the sliding trajectory of the locking element 402 within the track groove 201 ensures linear motion during the stretching process. When the specimen breaks, the engagement of the clamp 402 and the track groove 201 can limit the sudden displacement of the gripper 401 and prevent the fragments from scattering randomly.

[0027] As a further technical solution in this embodiment, combined with Figure 2 The protection mechanism includes limiting blocks 6 disposed on the inner walls of both sides of the end face opposite to the discharge port 101. A drive shaft 602 is rotatably disposed between the two limiting blocks 6. The two ends of the drive shaft 602 are provided with transmission gears 603 for the cleaning mechanism. A limiting groove 601 with a Y-shaped structure is also formed on the surface of the limiting blocks 6. A connecting piece 604 is fixedly disposed at one end of the drive shaft 602. A connecting piece 605 is axially connected to the other end of the connecting piece 604. The inner ends of the connecting piece 605 have protruding limit posts, which are slidably disposed within the limit groove 601. A Z-shaped connecting rod 607 is axially connected to the end of the connecting piece 605 furthest from the connecting piece 604. A baffle 608 is fixedly connected to the end of the connecting rod 607 furthest from the connecting piece 605. A connecting rod 607 is also fixedly connected between the two connecting pieces 605. When the drive shaft 602 is driven to rotate by external power, the connecting piece 604 rotates synchronously with the drive shaft 602, causing the connecting piece 605 to swing around the axis. The limit posts on the inner side of the connecting piece 605 slide along the Y-shaped limit groove 601. By switching the paths of different branches of the groove, the swing amplitude of the connecting piece 605 is controlled. The two connecting pieces 605 maintain synchronous movement through the intermediate connecting rod 607, causing the Z-shaped connecting rod 607 to drive the baffle 608 to rise and fall vertically. When the concrete specimen breaks, the drive shaft 602 is triggered to rotate through the transmission system, and the limiting column slides along the Y-shaped branch of the limiting groove 601 to the closed path, pushing the baffle 608 to rise quickly to the discharge port 101 to form a shielding barrier.

[0028] As a further technical solution in this embodiment, combined with Figure 2The cleaning mechanism includes guide rails 8 corresponding to the lower ends of two transmission gears 603 and placed on the upper surface of the bottom plate of the experimental chamber 1. The guide rails 8 are L-shaped, and chains 801 are slidably mounted within them. These chains 801 mesh with the transmission gears 603. A push rod 802 is mounted between the ends of the two chains 801 furthest from the transmission gears 603. A brush head 803 is mounted at the lower end of the push rod 802. A transmission belt 504 is sleeved between the outer end of the drive shaft 602 and the transmission rod 501. When the drive shaft 602 is driven to rotate by the transmission belt 504, the transmission gear 603 at its end drives the chains 801 to reciprocate along the L-shaped guide rails 8. When the chains 801 rise within the vertical section of the guide rail 8, they drive the push rod 802 upwards to avoid the experimental area. When they translate within the horizontal section of the guide rail 8, they drive the brush head 803 to sweep along the surface of the bottom plate. Two chains 801 control the horizontal displacement range of push rod 802 through synchronous movement. Brush head 803, driven by push rod 802, concentrates and pushes the broken concrete debris towards discharge port 101. Transmission belt 504 connects drive shaft 602 and transmission rod 501 to ensure that the cleaning mechanism and tensioning device are linked for control.

[0029] As a further technical solution in this embodiment, combined with Figure 3 The cleaning mechanism includes bevel gears 503 fixedly mounted at both ends of the transmission rod 501 within the experimental chamber 1. A vertically connected and rotatable transmission shaft 701 is mounted on the bottom plate of the experimental chamber 1 at the lower ends of the two bevel gears 503. A second bevel gear 7, meshing with the first bevel gear 503, is mounted on the top of the transmission shaft 701. The lower end of the transmission shaft 701 extends to the outer end of the experimental chamber 1. When the transmission rod 501 is driven to rotate, the bevel gears 503 fixed at both ends rotate synchronously, driving the vertical transmission shaft 701 to rotate through meshing with the second bevel gear 7. The transmission shaft 701 transmits power to the discharge wheels 702 via a transmission belt 703 at its bottom, causing the two sets of discharge wheels 702 to rotate in opposite directions at a set speed. During the experiment, concrete fragments are continuously pushed outward by the rotating discharge wheels 702 and discharged from the chamber through the discharge port 101, preventing the discharge port 101 from becoming clogged with debris.

[0030] As a further technical solution in this embodiment, combined with Figure 3The cleaning mechanism also includes two discharge wheels 702 disposed at the discharge port 101. The two discharge wheels 702 are rotatably mounted on the bottom plate of the experimental chamber 1. A transmission belt 703 is sleeved between the discharge wheels 702 and the transmission shaft 701. When the transmission rod 501 drives the transmission shaft 701 to rotate via a bevel gear, the transmission shaft 701 drives the two discharge wheels 702 to rotate synchronously via the transmission belt 703. The raised structures on the surface of the discharge wheels 702 contact the broken concrete fragments during rotation, pushing them outward from the discharge port 101. The rotational speed of the discharge wheels 702 can be controlled by adjusting the transmission ratio of the transmission belt 703, for example, by using a combination of sprockets with different numbers of teeth, thereby adapting to the discharge requirements of fragments of different sizes.

[0031] As a further technical solution in this embodiment, the experimental specimen 9 is an I-shaped specimen formed by the solidification and cooling of concrete. Through its specific shape design, the narrow central area of ​​the I-shaped specimen becomes a stress concentration point during tensile testing. When the tensile force reaches the tensile limit of the concrete, the specimen fractures in this area. Due to the constraint of the I-shaped structure, the fragments after fracture are mainly concentrated in the central area, reducing the possibility of them splashing to both sides.

[0032] Example 2: This application proposes a concrete tensile testing experimental device including an experimental chamber 1 and an experimental specimen 9. A support device is installed at the upper port of the experimental chamber 1. The support device includes a support rail 2 and a support frame 5 and a transmission rod 501 in the middle. The support frame 5, the transmission rod 501 and the support rail 2 are connected to the tensile device. A protection mechanism connected to the transmission rod 501 is installed on the inner side wall of the experimental chamber 1. A cleaning mechanism linked to the protection mechanism is set on the bottom plate of the chamber. A discharge port 101 is opened on the side wall of the chamber and a discharge mechanism linked to the transmission rod 501 is configured. Among them, the support device refers to the basic structure that supports the tensioning device. Specifically, it can be achieved by combining parallel tracks and support frames 5. A transmission rod 501 is set in the middle of the track to form a power transmission path and provide movement guidance for the tensioning device. The protective mechanism refers to the protective components that prevent fragments from flying. Specifically, it can be implemented using a linkage baffle 608 structure. The baffle 608 is connected to the transmission rod 501 through the linkage 607 mechanism, and automatically unfolds to form a protective barrier when the specimen breaks. The cleaning mechanism refers to the device that processes the fragments. Specifically, it can be implemented by a combination of guide rail 8 and push brush. The push brush moves along the guide rail 8 through chain 801 and pushes the fragments to the discharge port 101. The discharge mechanism refers to the fragment output device, which can be implemented by a rotating discharge wheel 702. The discharge wheel 702 is connected to the transmission rod 501 via a transmission belt to achieve automatic discharge of fragments.

[0033] By setting the support rail 8 used for guiding the movement of the tensioning device in a Y-shaped structure, before starting the equipment, the two pull rods 4 of the tensioning device are located at the extension end of the support rail 8 and are in an open state. After placing the test specimen 9 in the placement slot 3 and starting the equipment, the base 301 is driven to move away from the placement slot 3 by the transmission rod 501. The gripper 401 retracts along the direction of the guide rail 8 and automatically clamps the test specimen 9, completing the automatic clamping and reducing manual fixing work. When the transmission rod 501 rotates, it drives the drive shaft 602 to rotate through the transmission belt 504. The drive shaft 602 pulls the connecting piece 605 into the limiting slot 601 through the connecting piece 604. The device moves in a Y-shape, eventually pulling the baffle 608 via the Z-shaped connecting rod 607 and covering the upper part of the experimental chamber 1 to prevent the experimental specimen 9 from scattering when it breaks. At the same time, when the drive shaft 602 rotates, it pulls the chain 801 towards one side wall of the experimental chamber 1 via the transmission gear 603 on the drive shaft 602, causing the push rod 802 to retract. When the experiment ends, the push rod 802 is pushed back to its original position according to the reverse rotation of the transmission gear 603, pushing the concrete fragments scattered in the experimental chamber 1 to the discharge mechanism. The transmission rod 501 rotates to drive the discharge mechanism, thereby agitating and discharging the material pushed by the push rod 802 from the experimental chamber 1 to complete the cleaning and prevent the gravel from clogging the discharge buckle.

[0034] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included within the present invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A concrete tensile testing experimental device, comprising an experimental chamber (1) and an experimental specimen (9), characterized in that: The experimental chamber (1) is equipped with a support device at its upper port. The support device includes a support rail (2) and a support frame (5) and a transmission rod (501) located in the middle of the support rail (2). The support frame (5), the transmission rod (501) and the support rail (2) are connected to a tensioning device. A protective mechanism is installed on one side wall of the experimental chamber (1). The protective mechanism is connected to the transmission rod (501). A cleaning mechanism connected to the protective mechanism is also provided on the upper side of the bottom plate of the experimental chamber (1) near the protective mechanism. A discharge port (101) is opened on the side wall of the experimental chamber (1) opposite to the protective mechanism. A discharge mechanism is provided at the discharge port (101). The discharge mechanism is connected to the transmission rod (501).

2. The concrete tensile testing apparatus according to claim 1, characterized in that: The support rail (2) is horizontally mounted at the upper opening of the experimental box (1). There are two support rails (2), which are parallel and symmetrical to each other. A rail groove (201) is opened in the middle of the support rail (2). One end of each support rail (2) extends outward at an angle, and the extended ends of the two support rails (2) form a V-shaped structure.

3. The concrete tensile testing apparatus according to claim 1, characterized in that: There are two support frames (5). The two support frames (5) are erected parallel to each other between the middle of the two inner walls of the experimental box (1) and parallel to the two support rails (2). The transmission rod (501) is rotatably erected between the middle of the two inner walls of the experimental box (1) and placed at the lower end between the two support frames (5). The transmission rod (501) is set parallel to the two supports respectively. One end of the transmission rod (501) is coaxially connected to the drive motor (502).

4. The concrete tensile testing apparatus according to claim 1, characterized in that: The stretching device includes a support base, which is set on the upper port of the experimental box (1) and placed between the extension ends of two support rails (2). The upper end of the support base has a T-shaped placement groove (3) and also includes a base (301). The base (301) has three mounting holes (302) at its front and rear ends. The three mounting holes (302) are respectively set for two support rods and one transmission rod (501). The support rods and the transmission rod (501) are both set in the mounting holes (302). The inner wall of one mounting hole (302) used to fix the transmission rod (501) is provided with a thread that matches the transmission rod (501).

5. The concrete tensile testing apparatus according to claim 4, characterized in that: The base (301) has fixed shafts (303) on both the left and right sides of the upper end, which are vertically arranged on the upper surface of the base (301). Each fixed shaft (303) has a swingable pull rod (4). Each pull rod (4) has a gripper (401) with an inward opening fixed at one end of the fixed shaft (303). The openings of the two grippers (401) are arranged opposite each other. Each gripper (401) has a clip (402) protruding from the lower end. The clip (402) is slidably arranged in the track groove (201) of the support track (2).

6. The concrete tensile testing apparatus according to claim 1, characterized in that: The protective mechanism includes limiting blocks (6) on the inner walls of both sides opposite the discharge port (101). A drive shaft (602) is rotatably arranged between the two limiting blocks (6). Both ends of the drive shaft (602) are provided with transmission gears (603) for the cleaning mechanism. A limiting groove (601) is also formed on the surface of the limiting blocks (6). The limiting groove (601) has a Y-shaped structure. A connecting piece (604) is also fixedly provided at the end of the drive shaft (602) for connecting... The other end of the first piece (604) is axially connected to the second piece (605). The two ends of the inner side of the second piece (605) have protruding limit posts. The two limit posts are slidably arranged in the limit groove (601). The end of the second piece (605) away from the first piece (604) is axially connected to the Z-shaped connecting rod (607). The end of the connecting rod (607) away from the second piece (605) is fixedly connected to the baffle (608). A balance bar (606) is also fixedly connected between the two second pieces (605).

7. The concrete tensile testing apparatus according to claim 6, characterized in that: The cleaning mechanism includes a guide rail (8) corresponding to the lower end of the two transmission gears (603) and placed on the upper surface of the bottom plate of the experimental box (1). The guide rail (8) has an L-shaped structure. A chain (801) is slidably arranged inside the guide rail (8). The chain (801) is meshed with the transmission gear (603). A push rod (802) is mounted between the ends of the two chains (801) away from the transmission gear (603). A brush head (803) is provided at the lower end of the push rod (802). A transmission belt (504) is sleeved between the outer end of the drive shaft (602) and the transmission rod (501).

8. The concrete tensile testing apparatus according to claim 1, characterized in that: The cleaning mechanism includes a bevel gear 1 (503) fixedly installed on both ends of the transmission rod (501) inside the experimental box (1). A transmission shaft (701) is vertically connected to the bottom plate of the experimental box (1) and is rotatable. A bevel gear 2 (7) is provided at the top of the transmission shaft (701) and meshes with the bevel gear 1 (503). The lower end of the transmission shaft (701) extends to the outer end of the experimental box (1).

9. The concrete tensile testing apparatus according to claim 8, characterized in that: The cleaning mechanism also includes two discharge wheels (702) set at the discharge port (101). The two discharge wheels (702) are rotatably set on the bottom plate of the experimental box (1). A transmission belt (703) is sleeved between the discharge wheel (702) and the transmission shaft (701).

10. The concrete tensile testing apparatus according to claim 1, characterized in that: The experimental specimen (9) is an I-shaped specimen formed by the solidification and cooling of concrete.

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