CN2058488U - Flow Concrete Fluidity Tester - Google Patents

Abstract

The utility model discloses a test device for measuring the consistency of fluid concrete. It consists of a platen (1) and a bottom frame (2), and is characterized in that the bottom frame (2) is provided with a curved rod (3). When the curved rod (3) is pulled downward, the hinged cam (7) on the curved rod drives the platen (1) to rise, and the platen (1) just leaves the cam (7) and falls off when it reaches the specified height; Pull the curved lever (3), and the cam will slide over the platen (1) and get back to its original position. This test equipment solves the problem of free fall of the test plate that is difficult to achieve with similar foreign test devices, and ensures the accuracy of the test results on the basis of easy operation.

Description

The utility model belongs to a test device for measuring the consistency of fluid concrete.

With the application of superplasticizers and fluid concrete, the slump test can no longer meet the requirements of the concrete test. At this time, the fluidity test must be used to measure the consistency of the concrete. At present, there are no test standards and equipment in this area in my country, and the foreign fluidity test equipment is basically based on the British and German standard test equipment. The equipment specified in British Standard BS 1881: Part 105:1984 (see Figure 3) and the equipment specified in German Standard DIN 1043 Toil 2 (see Figure 4) are both composed of a platen and a bottom frame. The top has a handle. The bottom frame is equipped with height limiting components for the lifting height of the console board. During the test, a certain amount of fluid concrete is placed on the platform, the platform is manually lifted, and then it is allowed to fall freely to generate vibration. The concrete flows on the platen after several times of vibration, and then the consistency value of the concrete is determined according to the degree of flow. When using the above two devices for testing, since the operator has to use a certain amount of force when lifting the platen, it is difficult to prevent the platen from colliding with the height-limiting parts, and once the platen collides, it will produce a reaction force, and when it falls It is no longer a free fall, and of course the vibration effect will change accordingly, and the test results will also be affected.

The purpose of this utility model is to provide an improved test equipment. It is also composed of a platen and a bottom frame, but because the platen lifting device is arranged on the bottom frame, the purpose of not generating any kickback phenomenon when the platen is lifted is realized. The device is composed of a curved rod and a articulated cam, and is characterized in that the structure is simple and easy to use.

The utility model is realized in the following manner. A support is provided at the front end of the bottom frame of the test equipment, and a curved rod is hinged with a pin on the support (see Figure 1). Connected cam, the front end of the cam is arc-shaped (see Figure 2). When the crank rod is moved downward, the cam will drive the platen to rise, and the platen will move along the arc of the cam. When the specified height is reached, the platen just breaks away from the arc of the cam and falls off downwards, and vibrates after hitting the cushion block of the bottom frame. When the crank rod is moved upwards, the cam contacts the platen and rotates due to being blocked, then slides over the platen and rotates downward, and returns to its original position with the help of the elastic force of the spring piece and its own eccentric weight, so that the next cycle can be performed. operate. During the test, the operator can easily complete the test work as long as he has a good grasp of the time of take-off and landing.

Embodiments of the utility model will be further described below in conjunction with the accompanying drawings.

Figure 1 is a schematic diagram of the structure of the liquid concrete tester equipped with landing gear

Figure 2 is a schematic diagram of the landing gear structure

Figure 3 is a schematic diagram of the structure of the test device specified in the British Standard

Figure 4 is a schematic diagram of the structure of the test device specified in the German standard

The serial numbers in the figure are: 1—platen, 2—bottom frame, 3—curved rod, 4—, pin shaft, 5—support, 6—pin shaft, 7—cam, 8 - leaf spring.

Make the test platform (1) according to the specified size and weight, and then weld the bottom frame (2) of the supporting platform (1) with angle steel, and connect the platform (1) and the bottom frame ( 2) connected at one end. The front end of the bottom frame (2) is welded with two short ribs for installing the support (5) of the curved rod (3). Bearing (5) is processed by the angle steel of two pieces of 30 * 30 * 3 millimeters, has the pin hole that diameter is 16 millimeters on it. The base plate of support (5) is respectively fixed on the short rib of bottom frame (2) with two bolts. The standoff spacing is 26mm. Curved bar (3) is welded with the square steel of 24 * 24 * 110 millimeters and the sleeve pipe that diameter is 24 millimeters, length is 55 millimeters, and its axis angle is 120 degree. The curved rod (3) front portion forms a groove (seeing figure 2) of 40 * 16 * 20 millimeters through processing, and making diameter is the shaft hole of 8 millimeters in the both sides of groove. Its aperture center is apart from curved bar (3) front end 8 millimeters, apart from groove bottom 10 millimeters. The rear end of the square steel is the shaft hole that is 16 millimeters in the bending position of the curved rod (3) so as to be hinged with the support, and the center of the shaft hole is 97 millimeters away from the curved rod front end. In addition, make a cam (7) with a thickness of 15 millimeters with common section steel. The cam (7) is 45 degree fan-shaped. The center of the axle hole is 25 mm from the front end arc and 9.5 mm from the rear end arc. After cam (7) is hinged in the groove with bearing pin (6), crank bar (3) is hinged on the bearing (5) with another root bearing pin (4) again. The bolt hole below the support (5) is made into a rectangular shape along the axis of the crank rod, so that the lifting height required by the platen (1) can be adjusted by moving the position of the support back and forth like this. Fix a leaf spring (8) on the edge of the groove of the curved bar (3) with two screws, and allow one end of the leaf spring (8) to stretch toward the groove. When the crank rod (3) moves upwards, the cam (7) touches the platen (1) and rotates, and slides over the platen (1) under the action of the spring leaf (8) and then turns down to the bottom plate that falls on the groove to return to the original original position.

The test is carried out with the test equipment with platform lifting device, which effectively overcomes the influence of operational factors on the test results. No matter in the laboratory or on the construction site, the utility model has good usability and reproducibility.

Claims (3)

1. A measuring instrument for measuring fluidity of fluidized concrete is composed of a test plate (1) and a bottom frame (2) below the plate (1), and is characterized in that the bottom frame 2) front end is provided with a The platen (1) picks up and allows the curved rod (3) to fall off freely; the curved part of the curved rod (3) is hinged on the support (5) at the front end of the bottom frame (2) by a pin shaft (4). 2. The liquid concrete fluidity measuring instrument according to claim 1, characterized in that the front end of the curved rod (3) is a groove structure, and the groove is provided with a cam (7) hinged with a bearing pin (6), the groove Spring leaf (8) is installed on the limit. 3. The fluidity measuring instrument for fluid concrete according to claim 2, characterized in that the front end of the cam (7) is arc-shaped.

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