Coarse aggregate soft particle testing machine

Abstract

The utility model provides a coarse aggregate soft particle testing machine which comprises a base, a bottom box arranged above the base, a positioning baffle plate arranged on one side of the bottom box and used for positioning the bottom box, guide shafts respectively arranged at two ends above the base, a fixed frame arranged at the upper ends of the guide shafts, a screw rod penetrating through the central position of the fixed frame, and a screw rod connected with the screw rod, a rotating handle is mounted at the upper end of the screw rod, a sliding frame is connected to the lower end of the screw rod, and open holes allowing the guide shafts to penetrate through are formed in the two ends of the sliding frame respectively; a pressure sensor is installed on the lower surface of the sliding frame, the lower end of the pressure sensor is connected with a pressing plate, the pressing plate is located over the bottom box, and a displayer is installed on the side face of the sliding frame. The bottom box can be fixed and prevented from moving, and it is ensured that the pressing plate can be stably and accurately pressed into the bottom box; and the screw rod and the sliding frame can be kept movable, so that the influence of the rotating screw rod on the pressing plate can be avoided, and the test accuracy is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of soft particle detection, in particular to a coarse aggregate soft particle testing machine. Background Art

[0002] At present, in order to ensure the quality requirements of the project, the content of weak particles in the aggregate is one of the test items that must be done during the construction of the project. The equipment used to determine the content of weak particles in crushed stone, gravel and crushed gravel is the weak particle tester, and then the content of weak particles in coarse aggregate is used to evaluate the quality of aggregate. In concrete, it affects the actual strength of concrete. In construction projects, the quality of aggregate directly affects the quality of the project. At present, there is no unified equipment for the detection of weak particles in aggregates in China. It can be roughly divided into electric and manual test equipment. Electric loading test equipment is large in size, slow in loading speed, and expensive. In actual testing, the pressurization method of both manual and electric testers is relatively extensive, and it is not possible to pressurize at a uniform speed. The operating specifications do not specify the loading method, loading rate, whether torque is required during the test process, and how to count as loading failure, which makes the accuracy of the test results lacking.

[0003] In the prior art, the soft particle detection equipment squeezes the particles to be tested by moving the screw downward, and measures the pressure on the particles to be tested after they are broken. However, this device that tests by rotation will generate torque (also called torque) on the pressure plate during the test, affecting the accuracy of the test; and the box at the lower end for placing aggregates is not easy to fix and position. When the pressure plate is pressed down, the bottom box is easily damaged. If a fixed bottom box is used, it is difficult to clean it, affecting the efficiency of the next batch of aggregate measurement. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a coarse aggregate soft particle testing machine, and the technical solution adopted is as follows:

[0005] A coarse aggregate soft particle testing machine comprises a base, a bottom box is placed above the base, a positioning baffle for positioning the bottom box is provided on one side of the bottom box, guide shafts are respectively installed at both ends above the base, a fixing frame is installed at the upper end of the guide shaft, a screw rod passes through the center position of the fixing frame, a rotating handle is installed at the upper end of the screw rod, a sliding frame is connected to the lower end of the screw rod, and openings for the guide shaft to pass through are respectively provided at both ends of the sliding frame;

[0006] A pressure sensor is installed on the lower surface of the sliding frame, and a pressure plate is connected to the lower end of the pressure sensor. The pressure plate is located just above the bottom box, and a display is installed on the side of the sliding frame.

[0007] Furthermore, the pressure sensor is a screw-type pressure sensor, and the sliding frame and the pressure plate are respectively connected through screws at the upper and lower ends of the sensor.

[0008] Furthermore, protrusions are provided opposite to each other on both sides of the bottom box, and grooves are provided on the upper surface of the positioning baffle for the protrusions on both sides of the bottom box to be clamped; and magnets are provided at the positions in the grooves that contact the protrusions, and another magnet or iron sheet that is attracted to the magnets is provided in the protrusions on both sides of the bottom box, so as to fix the position of the bottom box and prevent it from moving, thereby ensuring that the pressure plate can be pressed into the bottom box stably and accurately.

[0009] Furthermore, one end of the positioning baffle is a semicircular ring structure, and a 1-3 cm high opening is provided at the lower end of the semicircular ring. Sundries, dust and bone particles in the positioning baffle can be removed through the opening without affecting the fit between the bottom box and the positioning baffle.

[0010] Furthermore, an opening for inserting a screw is provided on the upper surface of the sliding frame, and a groove for pre-installing a retaining ring is provided at the lower end of the screw and at the position where the screw is inserted into the sliding frame. After the lower end of the screw is inserted into the interior of the sliding frame, an embedding groove is provided in the opening of the sliding frame and at the same height as the groove in the screw.

[0011] Furthermore, a circular hole for the screw rod to pass through is provided at the center position of the fixing frame, and an internal thread is provided on the inner side of the circular hole, and the fixing frame is threadably connected to the screw rod through the internal thread.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] One end of the positioning baffle of the present invention is a semicircular ring structure, and an opening is provided at the lower end of the semicircular ring. When placing the bottom box, the sundries above the base and located on the inner side of the positioning baffle can be pushed out by pushing the bottom box, which will not affect the fit between the bottom box and the positioning baffle. The opening can also prevent sundries from remaining at the angle of the positioning baffle. After the bottom box is placed on the inner side of the positioning baffle, the magnet provided in the positioning baffle can fix the bottom box to prevent it from moving, thereby ensuring that the pressing plate can be stably and accurately pressed into the bottom box.

[0014] When the groove of the screw rod of the present invention is at the same height as the embedding groove in the sliding frame, the retaining spring pops open and is stuck in the embedding groove. Since the width of the retaining spring is greater than the width of the embedding groove, a part of the retaining spring will remain in the groove of the screw rod. Through this structure, the screw rod and the sliding frame can be fixed, and the screw rod and the sliding frame can remain movable. Through this structure, the rotating screw rod can be prevented from affecting the pressure plate, thereby ensuring the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the positioning baffle of the utility model;

[0017] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0018] Figure 4 This utility model Figure 2 A schematic diagram of the structure enlargement in the middle;

[0019] Figure 5 This utility model Figure 3 Enlarged schematic diagram of the structure at point B in the middle.

[0020] In the figure:

[0021] 1-base, 11-positioning baffle, 12-bottom box, 13-magnet, 2-guide shaft, 3-sliding frame, 4-fixed frame, 5-screw, 51-rotating handle, 52-circlip, 6-display, 7-pressure sensor, 8-pressure plate. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0023] As attached Figure 1-5 shown.

[0024] A coarse aggregate soft particle testing machine comprises a base 1, a bottom box 12 is placed above the base 1, a positioning baffle 11 for positioning the bottom box 12 is provided on one side of the bottom box 12, guide shafts 2 are respectively installed at both ends above the base 1, a fixing frame 4 is installed at the upper end of the guide shaft 2, a screw rod 5 passes through the center position of the fixing frame 4, a rotating handle 51 is installed at the upper end of the screw rod 5, a sliding frame 3 is connected to the lower end of the screw rod 5, and openings for the guide shaft 2 to pass through are respectively provided at both ends of the sliding frame 3.

[0025] The bottom box 12 has protrusions on both sides opposite to each other, and the upper surface of the positioning baffle 11 is provided with grooves for the protrusions on both sides of the bottom box 12 to be clamped.

[0026] A magnet 13 is arranged at the position in the groove that contacts the protrusion, and another magnet or iron sheet adsorbed with the magnet 13 is arranged in the protrusions on both sides of the bottom box 12 .

[0027] During installation: the retaining spring 52 is pre-installed in the groove at the lower end of the screw rod 5. After the lower end of the screw rod 5 is inserted into the sliding frame 3, when the groove of the screw rod 5 and the embedded groove in the sliding frame 3 are at the same height, the retaining spring 52 pops open and is stuck in the embedded groove. Since the width of the retaining spring is greater than the width of the embedded groove, a part of the retaining spring will remain in the groove of the screw rod 5. Through this structure, the screw rod 5 and the sliding frame 3 can be fixed, and the screw rod and the sliding frame can remain movable.

[0028] The working principle is to soak the aggregate to be tested in water for more than 8 hours, and then distinguish them according to the particle size of the aggregate particles. The distinction criteria are: aggregate particles with a particle size of 5-10mm are the first level; aggregate particles with a particle size of 10-20mm are the second level; and aggregate particles with a particle size of 20-40mm are the third level.

[0029] The maximum compressive load of different levels of bone particles is different. The maximum compressive load of the first level is 150N; the maximum compressive load of the second level is 250N; and the maximum compressive load of the third level is 340N.

[0030] Sampling is performed at each level, and the sampled bone particles are placed in the bottom box 12, which is then placed above the base 1, and the bottom box 12 is completely in contact with the positioning baffle 11, so that the bottom box 12 can be located directly below the pressing plate 8. The magnet 13 provided in the positioning baffle 11 can fix the bottom box 12 to prevent it from moving, thereby ensuring that the pressing plate 8 can be pressed into the bottom box 12 stably and accurately.

[0031] By rotating the handle 51, the screw 5 rotates to cause the sliding frame 3 to move downward, and the pressure plate 8 descends to apply pressure to the aggregate in the bottom box 12. The pressure value is sensed by the pressure sensor 7 and displayed on the display 6 on one side of the sliding frame 3; the pressure sensor 7 is a screw-type pressure sensor.

[0032] By observing the pressure value in the display 6, the pressure value of the current pressure plate 8 on the aggregate in the bottom box 12 can be known. When the required pressure value is reached, the handle 51 is rotated in the opposite direction to make the slide 3 rise. At this time, the bottom box 12 can be pulled out from above the base 1 to observe whether the aggregate is crushed. If it is crushed, it is called weak particles, which are discarded, and the mass of the remaining stones in this level is weighed. Finally, the test results are processed using the weak particle content formula.

[0033] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. A coarse aggregate soft particle testing machine, comprising a base (1), a bottom box (12) being placed above the base (1), characterized in that: A positioning baffle (11) for positioning the bottom box (12) is provided on one side of the bottom box (12); guide shafts (2) are respectively installed at both ends above the base (1); a fixing frame (4) is installed at the upper end of the guide shaft (2); a screw rod (5) passes through the center position of the fixing frame (4); a rotating handle (51) is installed at the upper end of the screw rod (5); a sliding frame (3) is connected to the lower end of the screw rod (5); and openings for the guide shaft (2) to pass through are respectively provided at both ends of the sliding frame (3); A pressure sensor (7) is installed on the lower surface of the sliding frame (3), and a pressure plate (8) is connected to the lower end of the pressure sensor (7). The pressure plate (8) is located directly above the bottom box (12). A display (6) is installed on the side of the sliding frame (3).

2. A coarse aggregate soft particle testing machine as claimed in claim 1, characterized in that: The pressure sensor (7) is provided with screw rods at both the upper and lower ends, and is respectively connected to the sliding frame (3) and the pressure plate (8) through the screw rods.

3. A coarse aggregate soft particle testing machine as claimed in claim 1, characterized in that: The bottom box (12) is provided with protrusions on opposite sides, and the upper surface of the positioning baffle (11) is provided with grooves for clamping the protrusions on the two sides of the bottom box (12).

4. A coarse aggregate soft particle testing machine as claimed in claim 3, characterized in that: A magnet (13) is provided at a portion of the groove in contact with the protrusion, and another magnet or iron sheet adsorbed to the magnet (13) is provided in the protrusions on both sides of the bottom box (12).

5. A coarse aggregate soft particle testing machine as claimed in claim 3, characterized in that: One end of the positioning baffle (11) is a semicircular ring structure, and an opening with a height of 1-3 cm is provided at the lower end of the semicircular ring.

6. A coarse aggregate soft particle testing machine as claimed in claim 1, characterized in that: A circular hole for the screw rod (5) to pass through is provided at the center of the fixing frame (4), and an internal thread is provided on the inner side of the circular hole, and the fixing frame (4) is threadedly connected to the screw rod (5) via the internal thread.

7. A coarse aggregate soft particle testing machine as claimed in claim 1, characterized in that: An opening for inserting a screw rod (5) is provided on the upper surface of the sliding frame (3), and a groove for pre-installing a retaining ring (52) is provided at the lower end of the screw rod (5) and at the position where the screw rod (5) is inserted into the sliding frame.

8. A coarse aggregate soft particle testing machine as claimed in claim 7, characterized in that: After the lower end of the screw rod (5) is inserted into the interior of the sliding frame (3), an embedding groove is opened in the opening of the sliding frame (3) and at a position at the same height as the groove in the screw rod (5).

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