CN108181160B

CN108181160B - Device for testing working performance of concrete

Info

Publication number: CN108181160B
Application number: CN201711484737.5A
Authority: CN
Inventors: 王志勇; 李秀苑
Original assignee: Chongqing Radio and TV University
Current assignee: Chongqing Radio and TV University
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2020-05-15
Anticipated expiration: 2037-12-29
Also published as: CN108181160A

Abstract

The invention belongs to the field of concrete testing devices, and particularly discloses a device for testing the working performance of concrete, which comprises a loading structure and a connecting frame, the structure of heating and the proof box that is used for holding erosion solution, the link is connected with the proof box, add the lotus structure with heat the structure all be located the proof box top and with link fixed connection, support and link fixed connection, connecting plate and support sliding connection, the motor is fixed on the link and the motor can drive the screw rod and rotate, be equipped with the screw thread spare on the support, screw rod and screw thread spare screw-thread fit, the one end that the motor was kept away from to the screw rod is equipped with first bevel gear, first bevel gear meshing has second bevel gear, second bevel gear coaxial coupling has the pivot, the pivot is connected with crank one end, the crank other end is connected with connecting rod one end, the connecting rod other end is articulated with the rack, rack and connecting plate sliding connection, gear and. The device can test the working performance of the road concrete under the coupling action of multiple factors.

Description

Device for testing working performance of concrete

Technical Field

The invention relates to the field of concrete testing devices, in particular to a device for testing the working performance of concrete.

Background

With the rapid development of urban construction, the number of construction projects such as buildings, expressways, bridges and the like is increasing day by day. The concrete has the advantages of rich raw materials, low price, simple production process, high compressive strength, good durability, wide strength grade range and the like, so the concrete becomes a key raw material in construction projects such as buildings, expressways, bridges and the like. Concrete is a generic term for engineering composites where aggregates are cemented into a whole by cementitious materials. The term concrete generally refers to cement as the cementing material and sand and stone as the aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering. In the engineering construction process, the quality of the concrete directly affects the engineering quality, so that the performance test of the concrete is particularly necessary. The existing research aiming at the degradation mechanism of concrete mainly aims at the action of stress, namely, the stress of the concrete is tested by applying pressure on a concrete sample through a loading structure, or the stress and the crack expansion or the change of composition and structure under the compounding of a single chemical factor are tested. The actual situation is that the environments of concrete, especially highway concrete, in the using process are various and very complex, the concrete is only subjected to wind, sunlight and rain, the load performance of the concrete is tested, the performance of the concrete cannot be comprehensively reflected, the test result is relatively comprehensive, and the performance of the concrete in the complex environment cannot be objectively analyzed.

Disclosure of Invention

The invention aims to provide a device for testing the working performance of concrete, which can test the working performance of road concrete under the coupling action of multiple factors.

In order to achieve the above purpose, the basic scheme of the invention is as follows: a device for testing the working performance of concrete comprises a loading structure, a connecting frame, a heating structure and a test box for containing erosion solution, wherein a liquid outlet is formed in the lower portion of the test box, the connecting frame is connected with the test box, the loading structure and the heating structure are both positioned above the test box and fixedly connected with the connecting frame, the loading structure comprises a support, a motor, a connecting rod, a crank, a rack, a gear, a connecting plate and rollers, the support is fixedly connected with the connecting frame, the connecting plate is in sliding connection with the support, the motor is fixed on the connecting frame and can drive a screw rod to rotate, a threaded part is arranged on the support, the screw rod penetrates through the threaded part and is in threaded fit with the threaded part, the screw rod is in rotating connection with the connecting plate, a first bevel gear is arranged at one end of the screw rod, which is far away from the motor, and is meshed with a, the second bevel gear rotates with the connecting plate and is connected and coaxial coupling has the pivot, the pivot is connected with crank one end, the crank other end is connected with connecting rod one end, the connecting rod other end is articulated with the rack, rack and connecting plate horizontal sliding connection, the gear rotates with the connecting plate to be connected, gear and the coaxial fixed connection of gyro wheel.

When this scheme of adoption, when testing the performance of concrete, put into the test box with the concrete sample to add the erosion solution in the test box, the simulation is to the environment that the concrete erodees. Then the motor is started and drives the screw to rotate. Because screw rod one end is connected with first bevel gear, and first bevel gear and second bevel gear meshing, so the motor rotates and drives first bevel gear rotation through the screw rod, and first bevel gear drives second bevel gear rotation again. Because the second bevel gear is coaxially connected with a rotating shaft which is connected with one end of a crank, the other end of the crank is connected with one end of a connecting rod, the other end of the connecting rod is hinged with a rack, and the rack is horizontally connected with the connecting rod in a sliding manner. Therefore, the second bevel gear can drive the rotating shaft to rotate when rotating, and the rotating shaft drives the rack to slide along the connecting plate in a reciprocating manner through the crank and the connecting rod. Because the rack is meshed with the gear, and the gear is rotationally connected with the connecting plate, the gear is driven to rotate in a reciprocating manner when the rack slides in a reciprocating manner, and then the roller is driven to rotate on the concrete sample to apply pressure to the concrete sample.

The scheme has the following beneficial effects: 1. and a liquid outlet is formed in the lower part of the test box, and the erosion solution in the test box can be discharged through the liquid outlet. A wet environment was simulated when the test chamber had the etching solution, and a dry environment was simulated when the etching solution was drained through the drain. Therefore, the test box can simulate erosion environment and dry-wet cycle environment, and is multifunctional. 2. The concrete sample can be simultaneously or independently subjected to the stress of a loading structure, the chemical corrosion of an etching solution, the dry-wet cycle, the temperature change and the like in the device so as to detect the performance of the concrete under the combined action of the factors. 3. The existing devices are static in testing the stress of the concrete, that is, the loading structure is used to continuously apply force to one or more points of the concrete to detect the performance of the concrete under load. The concrete used on the road is mostly subjected to the force generated when a vehicle runs on the concrete, namely the force is dynamic, so that the existing loading structure has limitations. In the scheme, the rotating shaft drives the rack to slide through the crank, the connecting rod and the like, and the rack slides to drive the gear to rotate so as to drive the rotating wheel to rotate, so that the condition of the automobile running on the concrete pavement is simulated. The rack slides back and forth along the connecting plate, and the sliding is not uniform, namely the rotating wheel is driven to rotate back and forth, the rotating speed is not uniform, even the rotating wheel stops rotating instantly, so that the conditions of different forces and instant stress on the concrete are simulated. 4. In this scheme, the motor drives the screw rod and rotates, because screw rod and screw member cooperation, and the screw rod rotates with the connecting plate to be connected, so the screw rod can produce axial displacement in the pivoted, and the screw rod rotates promptly and can the downstream, drives the connecting plate downstream, and the gyro wheel also has the trend of downstream, makes the power increase of gyro wheel and concrete sample, and test effect is better.

Further, the heating structure is a iodine tungsten lamp. The iodine-tungsten lamp is used for heating the concrete test piece, the temperature of the concrete under the action of sunlight and the like can be simulated, and the test result is more accurate and has higher reference. And the iodine-tungsten lamp has the characteristics of high brightness and long service life.

Furthermore, the iodine-tungsten lamp is two and is located loading structure both sides respectively. The adoption of two iodine tungsten lamps can ensure that the effect of the simulation environment is better and the test result is more accurate.

Furthermore, the bottom of the test box is provided with a plurality of supporting parts which can support the concrete sample. The supporting part can support the concrete sample, avoids concrete sample bottom to hug closely in the proof box bottom and can't contact with the erosion solution, influences the test to the concrete sample.

Further, the supporting part is triangular in longitudinal section. The contact area of the supporting part and the concrete test piece can be reduced as much as possible if the longitudinal section of the supporting part is triangular, so that the erosion solution is more fully contacted with the concrete test piece, and the test effect is better.

Furthermore, the screw thread piece is connected with the support in a rotating mode, and the support is provided with a limiting piece capable of limiting the screw thread piece to rotate. When the restriction piece does not restrict the screw thread piece, the screw thread piece is not in thread fit with the screw rod, the screw thread piece can rotate along with the rotation of the screw rod, and at the moment, the screw rod can not generate axial displacement. When the limiting part limits the rotation of the threaded part, the threaded part is in threaded fit with the screw, and the screw rotates to generate axial displacement to drive the roller pair to move downwards to apply force to the concrete test piece. Therefore, the force of the roller on the concrete sample can be adjusted according to the requirement, a constant pressure is applied to the concrete sample according to the requirement, the detection effect is better, and the reference is better.

Drawings

Fig. 1 is a schematic structural view of an embodiment of an apparatus for testing the working performance of concrete according to the present invention.

Detailed Description

The present invention will be described in further detail below by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a test box 1, a support part 2, a concrete sample 3, a liquid discharge port 4, a connecting frame 5, a roller 7, a iodine tungsten lamp 8, a motor 9, a connecting rod 10, a screw 11, a support 12, a nut 13, a sliding rail 14, a ring 15, a first bevel gear 16, a second bevel gear 17, a crank 18, a connecting rod 19, a gear 20, a rack 21, a connecting plate 22 and a limiting part 23.

The embodiment is basically as shown in the attached figure 1: the utility model provides a test concrete work performance's device, includes the loading structure, still includes link 5, heats the structure and is used for holding the proof box 1 that erodees the solution, and 1 lower part of proof box is equipped with leakage fluid dram 4, and link 5 is connected with proof box 1. The heating structure of this embodiment is a iodine-tungsten lamp 8, and the number of the iodine-tungsten lamps 8 is two and the two are respectively located at two sides of the loading structure. Use iodine tungsten lamp 8 not only can heat concrete sample 3, and can simulate the temperature that the concrete received the effect such as sunshine under, the test result is more accurate and more have the referential. The loading structure and the heating structure are both positioned above the test box 1 and are fixedly connected with the connecting frame 5. The loading structure comprises a support 12, a motor 9, a connecting rod 19, a crank 18, a rack 21, a gear 20, a connecting plate 22 and a roller 7, the support 12 is fixedly connected with the connecting frame 5, the connecting plate 22 is slidably connected with the support 12 through a sliding rail 14, the motor 9 is fixed on the connecting frame 5, an output shaft of the motor 9 is connected with the connecting rod 10, a sliding groove is formed in the side portion of the connecting rod 10, and a cavity is formed in the screw rod 11 and a protrusion is formed in the cavity wall of the cavity. The protrusion is clamped in the sliding groove and is in sliding fit with the sliding groove, so that the connecting rod 10 and the screw rod 11 can be in sliding connection and do not rotate relatively. A screw member, in this embodiment a nut 13, is rotatably connected to the bracket 12. A stopper 23 is slidably connected to the bracket 12, and the stopper 23 is capable of abutting against the nut 13. Screw rod 11 passes nut 13 and with nut 13 screw-thread fit, screw rod 11 axial is equipped with ring 15, screw rod 11 rotates through ring 15 and is connected with connecting plate 22, the one end that motor 9 was kept away from to screw rod 11 is equipped with first bevel gear 16, first bevel gear 16 meshes there is second bevel gear 17, second bevel gear 17 rotates with connecting plate 22 and is connected with the pivot coaxially, the pivot is connected with 18 one end of crank, the crank 18 other end is connected with connecting rod 19 one end, the connecting rod 19 other end is articulated with rack 21, rack 21 and connecting plate 22 horizontal sliding connection, gear 20 rotates with connecting plate 22 and is connected, gear 20 and the coaxial fixed connection of gyro wheel 7.

The bottom of the test box is provided with a plurality of supporting parts 2 which can support the concrete sample 3. The supporting part 2 has a triangular longitudinal section. The longitudinal section of the supporting part 2 is triangular, so that the contact area between the supporting part 2 and the concrete test piece 3 can be reduced as much as possible, the erosion solution is more sufficient to contact with the concrete test piece 3, and the test effect is better.

When testing the performance of concrete, put concrete sample 3 into the test box to add the erosion solution into the test box, simulate the environment of concrete erosion. Then the motor 9 is started, and the motor 9 drives the screw 11 to rotate. Because one end of the screw 11 is connected with a first bevel gear 16, and the first bevel gear 16 is meshed with a second bevel gear 17, the rotation of the motor 9 drives the first bevel gear 16 to rotate through the screw 11, and the first bevel gear 16 drives the second bevel gear 17 to rotate. Because the second bevel gear 17 is coaxially connected with a rotating shaft which is connected with one end of a crank 18, the other end of the crank 18 is connected with one end of a connecting rod 19, the other end of the connecting rod 19 is hinged with a rack 21, and the rack 21 is horizontally connected with the connecting rod 10 in a sliding way. When the second bevel gear 17 rotates, the rotating shaft is driven to rotate, and the rotating shaft drives the rack 21 to slide back and forth along the connecting plate 22 through the crank 18 and the connecting rod 19. Because the rack 21 is meshed with the gear 20, and the gear 20 is rotatably connected with the connecting plate 22, when the rack 21 slides back and forth, the gear 20 is driven to rotate back and forth, and the roller 7 is driven to rotate on the concrete sample 3, so that pressure is applied to the concrete sample 3.

First, the stopper 23 is slid so that the stopper 23 does not abut against the nut 13, and the nut 13 is not screwed to the screw 11, and the nut 13 rotates with the rotation of the screw 11. When the sliding limiting part 23 abuts against the nut 13, the limiting part 23 limits the rotation of the nut 13, the nut 13 is in threaded fit with the screw 11, and at the moment, the screw 11 rotates to generate axial displacement, so that the roller 7 is driven to apply force to the concrete sample 3 by moving downwards. Like this can adjust the power of gyro wheel 7 to concrete sample 3 as required to exert a invariable pressure to concrete sample 3 as required, the effect that detects is better, and more has the referential.

The concrete sample 3 can be simultaneously or independently subjected to the stress of a loading structure, the chemical corrosion of an etching solution, the dry-wet cycle, the temperature change and the like in the device so as to detect the performance of the concrete under the combined action of the factors. In the scheme, the rotating shaft drives the rack 21 to slide through the crank 18, the connecting rod 19 and the like, the rack 21 slides and drives the gear 20 to rotate so as to drive the rotating wheel to rotate, and the condition of the automobile running on the concrete pavement is simulated. The rack 21 slides back and forth along the connecting plate 22, and the sliding is non-uniform, i.e. the rotating wheel is driven to rotate back and forth, the rotating speed is not uniform, even the rotating wheel stops rotating instantly, so as to simulate the conditions of different forces and instant stress on the concrete.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The utility model provides a test concrete work performance's device, includes loading structure, its characterized in that: the device comprises a connecting frame, a heating structure and a test box for containing an erosion solution, wherein a liquid outlet is arranged at the lower part of the test box, the connecting frame is connected with the test box, the loading structure and the heating structure are both positioned above the test box and fixedly connected with the connecting frame, the loading structure comprises a support, a motor, a connecting rod, a crank, a rack, a gear, a connecting plate and a roller, the support is fixedly connected with the connecting frame, the connecting plate is slidably connected with the support, the motor is fixed on the connecting frame and can drive a screw rod to rotate, the support is provided with a threaded part, the screw rod penetrates through the threaded part and is in threaded fit with the threaded part, the screw rod is rotatably connected with the connecting plate, one end of the screw rod, far away from the motor, is provided with a first bevel gear, the first bevel gear is meshed with a second bevel gear, the second, the rotating shaft is connected with one end of a crank, the other end of the crank is connected with one end of a connecting rod, the other end of the connecting rod is hinged with a rack, the rack is horizontally connected with a connecting plate in a sliding mode, the gear is rotationally connected with the connecting plate, and the gear is coaxially and fixedly connected with the idler wheel; the heating structure is a iodine tungsten lamp; the threaded part is rotatably connected with the bracket, and the bracket is provided with a limiting part capable of limiting the rotation of the threaded part; the output shaft of the motor is connected with a connecting rod, the side part of the connecting rod is provided with a sliding chute, the screw is provided with a cavity, the cavity wall of the cavity is provided with a bulge, and the bulge is clamped in the sliding chute and is in sliding fit with the sliding chute; the rack is meshed with the gear.

2. The apparatus for testing the working performance of concrete according to claim 1, wherein: the method is characterized in that: the iodine-tungsten lamp is two and is located loading structure both sides respectively.

3. An apparatus for testing the working properties of concrete according to claim 2, wherein: the bottom of the test box is provided with a plurality of supporting parts which can support the concrete test piece.

4. An apparatus for testing the working properties of concrete according to claim 3, wherein: the supporting part is triangular in longitudinal section.