Fine aggregate flow time measuring device and measuring method

Abstract

The invention discloses a fine aggregate flow time measuring device and method, the device comprises a receiving container, a hopper, a support, an opening and closing mechanism and a sensing module, the opening and closing mechanism is an electromagnetic locking device, and an electromagnetic driving part controls opening and closing of a discharge port of the hopper; the control unit comprises a timing module, a processing module and a man-machine interaction module; when receiving an opening signal of the electromagnetic locking device, the processing module synchronously controls the sensing module to trigger, starts the timing module according to the signal of the sensing module, and stops timing when detecting that the falling of the material is finished; opening and closing of a discharge port of the hopper are controlled through the electromagnetic locking device, the control unit is triggered in real time in combination with the sensing module, a high-precision synchronous control mechanism is formed, flowing time instantaneous detection is achieved, the testing efficiency and the measuring precision are improved, and the problems of opening and closing delay, uneven force and data deviation of an existing device are solved. And the reliability and the engineering applicability of fine aggregate angularity evaluation are remarkably improved.

Description

Technical Field

[0001] The present invention relates to material testing equipment, and in particular to an apparatus and method for measuring the flow time of fine aggregates. Background Art

[0002] The angularity of fine aggregates, as a key index for evaluating the shape of aggregate particles, directly affects the performance evaluation of asphalt mixtures and is an important factor directly affecting the performance of engineering materials and construction quality. There are mainly two common methods for measuring the angularity of fine aggregates: the flow time method and the void ratio method. The flow time method is more commonly used in actual applications, especially in scenarios where it is necessary to quickly and accurately evaluate the impact of fine aggregates on engineering performance, and it has obvious advantages. At present, the existing fine aggregate flow time measuring device relies on a stepping motor to open and close the funnel, and at the same time uses an infrared detection plus weighing calculation time measurement method at the discharge port. Although automatic opening and closing and detection are achieved, there are problems such as uneven opening force, high delay, and high indirect calculation error. Summary of the Invention

[0003] Object of the Invention: The object of the present invention is to provide a fine aggregate flow time measuring device with high test accuracy, high operation efficiency and high data reliability. Another object of the present invention is to provide a method for measuring the flow time of fine aggregates using this device.

[0004] Technical Solution: A fine aggregate flow time measuring device according to the present invention includes a receiving container, a hopper, a bracket, an opening and closing mechanism, and a sensing module. The opening and closing mechanism is an electromagnetic locking device. The design without a motor simplifies the structure and has a faster response. Its electromagnetic driving component directly controls the opening and closing of the discharge port of the hopper. It also includes a control unit, which is electrically connected to the electromagnetic locking device and the sensing module. The control unit includes a timing module, a processing module, and a human-machine interaction module. When the processing module receives the opening signal of the electromagnetic locking device, it synchronously controls the triggering of the sensing module and starts the timing module according to the signal of the sensing module, and stops timing when it detects the end of the material falling.

[0005] Preferably, the sensing module includes an infrared optoelectronic sensor for detecting the start and end signals of the material falling, and its detection optical path is aligned with the discharge port of the hopper.

[0006] Preferably, the human-machine interaction module includes a touch display screen and LED status indicators. The touch display screen is integrated with test control buttons. The LED status indicators include a power indicator, a test ready light, and a fault alarm light.

[0007] Preferably, the control unit further includes a wireless communication module. The wireless communication module supports Bluetooth or Wi-Fi data transmission protocols and is used to transmit real-time timing data to a mobile terminal, and realizes remote monitoring, data management and generation of electronic reports through a dedicated APP.

[0008] Preferably, the control unit further includes a self-check module for detecting the working state of the device, which can automatically detect and timely discover the abnormalities of each component of the device, ensure that the device is always in the best working state, thereby improving the reliability and accuracy of the test, and reducing the test error and repeated test cost caused by equipment failure.

[0009] Preferably, the inner wall of the hopper is provided with a wear-resistant coating to avoid the influence of the friction between the fine aggregate and the hopper on the flow time.

[0010] Preferably, the device is a multi-hopper parallel test structure, and each hopper is equipped with an independent opening and closing mechanism and a sensing module, which can significantly improve the test efficiency, realize the simultaneous test of multiple samples, reduce the waiting time, and ensure the independence and accuracy of the test of each hopper. At the same time, it is convenient to expand the test scale and flexibly adjust the test configuration.

[0011] A measurement method using the above device includes the following steps:

[0012] S1: Start the electromagnetic locking type opening and closing mechanism to close the hopper through the human-computer interaction module;

[0013] S2: Inject a standard amount of fine aggregate into the hopper;

[0014] S3: After triggering the test instruction, the opening and closing mechanism opens the discharge port;

[0015] S4: The sensing module starts timing when it detects the falling of the material;

[0016] S5: Automatically terminate the timing and generate test data when the falling of the material stops;

[0017] S6: Output the test result including the flow time.

[0018] Preferably, step S1 includes setting aggregate type parameters, and parameters such as aggregate type and expected flow time can be set.

[0019] Preferably, the output method of step S6 includes local display and wireless transmission to a mobile terminal.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: The opening and closing of the discharge port of the hopper is directly controlled by the electromagnetic locking device, and the control unit is triggered in real time in combination with the sensing module to form a high-precision synchronous control mechanism, realizing the instantaneous detection of the flow time of the fine aggregate, which not only improves the test efficiency and measurement accuracy, but also solves the data deviation problem caused by the opening and closing delay, uneven force and indirect calculation error of the stepping motor in the existing device, and significantly improves the reliability and engineering applicability of the evaluation of the angularity of the fine aggregate. Description of the Drawings

[0021] Figure 1 This is the overall structural schematic diagram of the present invention.

[0022] Figure 2 This is the cross-sectional schematic diagram of the overall structure of the present invention.

[0023] Figure 3 This is the process control schematic diagram of the present invention. Detailed implementation manners

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0025] As Figures 1 - 3 shown, a fine aggregate flow time measuring device in this embodiment includes: a receiving container 1, a hopper 2, a bracket 3, an opening and closing mechanism 4, a sensing module 5 and a control unit. The hopper 2 is detachably installed on the bracket 3, and directly below the hopper 2 is the receiving container 1 for receiving the fine aggregate falling from the discharge port of the hopper 2, and its position is movable for convenient replacement. The hopper 2 is made of stainless steel, the inner diameter of its discharge port is of standard specification, and the inner wall is coated with a wear-resistant coating with a low friction coefficient to reduce the material flow resistance and avoid the influence on the flow time caused by the friction between the fine aggregate and the hopper 2. The opening and closing mechanism 4 is an electromagnetic locking device, and the design without a motor simplifies the structure and has a faster response. Its electromagnetic driving component directly controls the opening and closing of the discharge port of the hopper. The sensing module 5 includes an infrared photoelectric sensor for detecting the start and end signals of the material falling, and its detection optical path is aligned with the discharge port of the hopper 2. The control unit integrates a timing module, a processing module and a human-computer interaction module. The processing module is configured to synchronously receive the opening and closing signals of the electromagnetic locking device and the signals of the sensing module 5 to achieve accurate calculation of the flow time. At the same time, it will also store the latest 20 groups of test data and support USB export.

[0026] In addition, the control unit further includes a self-check module and a wireless communication module. The human-computer interaction module includes a touch display screen and LED status indicators. The touch display screen integrates test control buttons, and the LED status indicators include a power indicator, a test ready light and a fault alarm light. Functions such as parameter setting, test start, and data query can be completed by clicking on the touch display screen, and it supports bilingual operation in Chinese and English. Before each test, the self-check module automatically detects whether key components of the device, such as the sensing module 5, the electromagnetic locking device, the timing module, etc. are working properly; if a fault or abnormality is found, the system will prompt the user to check or repair through the LED status indicator or the touch display screen to ensure that the device is always in the best working state; the data information obtained after the test can be directly displayed on the touch display screen or wirelessly transmitted to a mobile terminal via Bluetooth or Wi-Fi for viewing, and remote monitoring, data management and generation of electronic reports can be realized through a dedicated APP.

[0027] During the test, the operator first starts the electromagnetic locking type opening and closing mechanism 4 to close the hopper 2 through the touch display screen of the human-machine interaction module, then sets the aggregate type and test parameters, and then injects standard volume of fine aggregate into the hopper 2. After triggering the test instruction, the electromagnetic locking device is instantaneously released, the discharge port is opened, and the infrared photoelectric sensor starts timing after detecting the initial falling signal of the material. When the material flow completely stops falling, the timing is terminated and the data is stored. The test results are sent to the mobile terminal through the wireless transmission module to generate an electronic report.

Claims

1. An apparatus for measuring the flow time of fine aggregate, comprising a receiving container (1), a hopper (2), a bracket (3), an opening and closing mechanism (4) and a sensing module (5), characterized in that, The opening and closing mechanism (4) is an electromagnetic locking device, and its electromagnetic driving component directly controls the opening and closing of the discharge port of the hopper (2); it also includes a control unit, which is electrically connected to the electromagnetic locking device and the sensing module (5). The control unit includes a timing module, a processing module, and a human-machine interaction module; when the processing module receives the opening signal of the electromagnetic locking device, it synchronously controls the triggering of the sensing module (5) and starts the timing module according to the signal of the sensing module (5), and stops timing when it detects the end of the material falling.

2. The fine aggregate flow time measuring device according to claim 1, characterized in that: The sensing module (5) includes an infrared photoelectric sensor for detecting the start and end signals of the material falling, and its detection optical path is aligned with the discharge port of the hopper (2).

3. The fine aggregate flow time measuring device according to claim 1, characterized in that: The human-machine interaction module includes a touch display screen and LED status indicators. The touch display screen is integrated with test control buttons. The LED status indicators include a power indicator, a test ready light, and a fault alarm light.

4. The fine aggregate flow time measuring device according to claim 1, wherein: The control unit further includes a wireless communication module, and the wireless communication module supports Bluetooth or Wi-Fi data transmission protocols.

5. The fine aggregate flow time measuring device according to claim 1, characterized in that: The control unit further includes a self-check module for detecting the working state of the device.

6. The fine aggregate flow time measuring device according to claim 1, wherein: The inner wall of the hopper (2) is provided with a wear-resistant coating.

7. The fine aggregate flow time measuring device according to claim 1, characterized in that: The device is a multi-hopper (2) parallel test structure, and each hopper (2) is equipped with an independent opening and closing mechanism (4) and a sensing module (5).

8. A measurement method using the device according to claim 1, characterized in that, Including the following steps: S1: Start the electromagnetic locking type opening and closing mechanism (4) through the human-machine interaction module to close the hopper (2); S2: Inject a standard amount of fine aggregate into the hopper (2); S3: After triggering the test instruction, the opening and closing mechanism (4) opens the discharge port; S4: The sensing module (5) starts timing when it detects the material falling; S5: Automatically terminate timing when the material falling stops and generate test data; S6: Output the test result including the flow time.

9. The measurement method according to claim 8, characterized in that: Step S1 includes setting aggregate type parameters, and parameters such as aggregate type and expected flow time can be set.

10. The measurement method according to claim 8, characterized in that: The output method of step S6 includes local display and wireless transmission to a mobile terminal.

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