Automatic loading device and method for testing mine ventilator

Abstract

The invention belongs to the field of underground coal mine ventilation, and relates to an automatic loading device and method for mine ventilator testing, the automatic loading device comprises a static air duct, a movable air duct and a driving device.The static air duct is formed by welding a left flange, an air duct, a static air door and a right flange, and the movable air duct enables the movable air door to be rotatably installed on a static air door convex shaft through a bearing; the driving device is meshed with the movable air door sector gear through a stepping motor driving gear, and rotation control over the movable air door is achieved. By adjusting the rotating angle d theta of the movable air door, the overlapping area of the air passing openings of the static air door and the movable air door is linearly changed, the air passing area variation is accurately calculated according to a formula, and therefore the load of the ventilator is remotely and automatically adjusted. According to the invention, the problems of low manual loading speed, low precision and potential operation safety hazards are solved, and rapid, accurate and unmanned test from no load to maximum load is realized.

Description

Technical Field

[0001] The invention belongs to the field of underground coal mine ventilation, and relates to an automatic loading device and method for testing a mine ventilator. Background Art

[0002] A mine ventilator, as the core equipment of the underground coal mine ventilation safety system, shoulders the important task of continuously conveying fresh air flow underground and is an indispensable ventilation power source to ensure the normal progress of coal mine production activities. During the coal mine exploitation process, due to the particularity of the underground environment, air circulation is often restricted, which easily leads to safety hazards such as the accumulation of harmful gases and the decrease of oxygen content. Therefore, the performance stability and reliability of the mine ventilator are directly related to the safety and efficiency of coal mine production.

[0003] To ensure that the mine ventilator can achieve the expected ventilation effect before being put into use and meet the ventilation requirements of the underground coal mine, it is particularly important to conduct strict performance tests on it. Among them, the loading test is a key link to evaluate the performance stability of the mine ventilator. The loading test aims to simulate the fan load conditions under different working conditions to test the working ability of the fan under a certain resistance. The traditional loading test method mostly uses the way of manually throwing paper sheets into the air duct to block the sieve mesh holes. However, this method has many deficiencies, seriously restricting the test efficiency and accuracy.

[0004] First of all, the manual loading method results in a low loading speed. During the test, the test personnel need to continuously throw paper sheets into the air duct to gradually increase the load borne by the fan. This process is not only time-consuming and laborious, but also difficult to quickly reach the required load level, thus affecting the test efficiency.

[0005] Secondly, the manual loading has low regulation accuracy and great randomness. Since factors such as the size, shape of the paper sheet and the throwing force will all affect the loading effect, it is difficult to keep the load borne by the fan consistent during each test. This randomness not only increases the uncertainty of the test, but also greatly reduces the reliability of the test results.

[0006] In addition, the manual loading method also has serious safety hazards. During the test, the test personnel need to operate near the air inlet of the fan, and the noise and wind force generated by the fan during operation often pose a threat to the safety of the test personnel. Especially under high load conditions, the noise and vibration generated by the fan are more intense. If the test personnel are in this environment for a long time, it is extremely easy to cause occupational diseases such as hearing damage.

[0007] In summary, the traditional manual loading method can no longer meet the requirements of rapid and accurate testing of mine ventilation fans. Therefore, developing an automatic loading device for mine ventilation fan testing that can automatically, rapidly, and accurately adjust the load is of great significance for improving the testing efficiency, accuracy, and safety of mine ventilation fans. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide an automatic loading device and method for mine ventilation fan testing to solve the existing problems.

[0009] To achieve the above object, the present invention provides the following technical solution: An automatic loading device for mine ventilation fan testing consists of three parts: a static air duct, a dynamic air duct, and a driving device; the static air duct is provided with a fixed air passing opening; the dynamic air duct is provided with a rotatable air passing opening adjusting mechanism, and the air passing opening adjusting mechanism cooperates with the fixed air passing opening of the static air duct to form an adjustable air passing area; the driving mechanism is connected to the air passing opening adjusting mechanism; wherein, the driving mechanism is configured to drive the air passing opening adjusting mechanism to rotate through a remote control instruction, realizing continuous linear adjustment of the air passing area from the maximum value to zero.

[0010] Optionally, the static air duct includes a left flange, a wind tunnel, a static air damper, and a right flange, where the static air damper is welded and fixed inside the wind tunnel, and the left flange and the right flange are respectively welded to the axial two ends of the wind tunnel.

[0011] Optionally, the air passing opening adjusting mechanism of the dynamic air duct includes a dynamic air damper, a bearing, and a baffle. The dynamic air damper is installed on the convex shaft of the static air damper through the bearing and is axially limited by the baffle.

[0012] Optionally, the driving mechanism includes a stepping motor and a gear. The gear is fixed to the output shaft of the stepping motor, and the dynamic air damper is provided with a sector gear meshing with the gear.

[0013] Optionally, an arc-shaped hole allowing the sector gear to pass through is opened at the lower part of the wind tunnel, and the radian angle of the arc-shaped hole is equal to the maximum rotation angle of the dynamic air damper.

[0014] Optionally, the maximum value S of the air passing area is determined by the following formula,

[0015] S = 0.5 * (R 2 - r 2 ) * θ * n;

[0016] wherein, R is the radius of the large arc of the air passing opening of the dynamic air damper, r is the radius of the small arc, θ is the included angle of the air passing opening, and n is the number of air passing openings.

[0017] Optionally, the change amount dS of the air passing area and the rotation angle dθ of the dynamic air damper satisfy a linear relationship.

[0018] An automatic loading method for mine ventilator testing, using an automatic loading device for mine ventilator testing as described above, includes the following steps: controlling the moving air damper to rotate to the no-load position where the air passing port of the static air damper is completely overlapped; rotating the moving air damper by an angle dθ through the driving mechanism to reduce the air passing area by dS; when the moving air damper rotates to the position where the air passing ports are completely misaligned, the air passing area drops to zero to apply the maximum load.

[0019] Optionally, the adjustment process of the rotation angle dθ of the moving air damper is controlled by the pulse signal of the stepping motor.

[0020] Optionally, the calculation formula for the change amount dS of the air passing area is: dS = 0.5 * (R 2 - r 2 ) * dθ * n.

[0021] The beneficial effects of the present invention are as follows: The present invention greatly improves the traditional manual loading method and brings significant beneficial effects to the performance testing of mine ventilators.

[0022] First of all, the automatic loading device significantly improves the loading speed. By adopting mechanical transmission devices such as stepping motors and gears, remote automatic control of the moving air damper is realized, so that the load of the ventilator can be quickly adjusted in a short time. This improvement not only greatly improves the test efficiency, but also makes the test process more convenient and efficient.

[0023] Secondly, the device has the ability to accurately control the load. By accurately calculating the relationship between the rotation angle of the moving air damper and the change amount of the air passing area, accurate control of the ventilator load is achieved. This high-precision control not only improves the accuracy of the test, but also provides more reliable data support for the evaluation of the ventilator performance.

[0024] In addition, the automatic loading device also greatly reduces the safety risks during the test process. Due to the adoption of the remote automatic loading method, the test personnel do not need to operate near the air inlet of the ventilator, thus effectively avoiding the safety hazards caused by the noise and wind force of the ventilator. This improvement not only protects the physical health of the test personnel, but also improves the safety and reliability of the test process.

[0025] In addition to the above significant beneficial effects, the automatic loading device and method for mine ventilator testing also have broad application prospects. It can be widely applied to the performance testing of various mine ventilators, providing strong guarantee for the ventilation safety and production efficiency in coal mines. At the same time, the device and method can also provide reference for the performance testing of other similar equipment, promoting the technological progress and development in related fields.

[0026] In summary, an automatic loading device and method for testing mine ventilators have multiple beneficial effects such as improving the loading speed, precisely controlling the load with high accuracy, reducing safety risks, and having broad application prospects. Its emergence has brought a revolutionary change to the performance testing of mine ventilators, providing a more reliable technical guarantee for ventilation safety and production efficiency in coal mine shafts.

[0027] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably in conjunction with the accompanying drawings, where:

[0029] Figure 1 is the overall schematic diagram of the present invention;

[0030] Wherein Figure 1 (b) is the overall cross-sectional view, Figure 1 (a) is Figure 1 the B-B view of (b);

[0031] Figure 2 is the schematic diagram of the second state of the present invention;

[0032] Wherein Figure 2 (b) is the overall cross-sectional view, Figure 2 (a) is Figure 2 the A-A view of (b).

[0033] Reference numerals: left flange 1, air duct 2, stepper motor 3, static air damper 4, convex shaft 41, gear 5, moving air damper 6, sector gear 61, bearing 7, baffle 8, right flange 9. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention schematically, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0035] Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than actual physical diagrams, and should not be construed as limiting the present invention; for better illustration of the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0036] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] Please refer to Figures 1 to 2 , which is a specific embodiment of an automatic loading device and method for testing a mine ventilation fan;

[0038] The present invention provides an automatic loading device and method for testing a mine ventilation fan, aiming to solve the problems of slow loading speed, low regulation accuracy, great randomness, and potential safety hazards existing in the traditional manual loading method. The following are specific embodiments of the present invention:

[0039] Specific Embodiment 1,

[0040] 1. Device Structure

[0041] The automatic loading device for testing a mine ventilation fan of the present invention, as shown in Figure 1 and Figure 2 , mainly consists of three parts: a static air duct, a dynamic air duct, and a driving device.

[0042] (1) Static air duct: It includes a left flange 1, an air duct 2, a static air damper 4, and a right flange 9. The static air damper 4 is welded and fixed inside the air duct 2, and the left flange 1 and the right flange 9 are respectively welded to the axial two ends of the air duct 2 to form a fixed air passing opening.

[0043] (2) Dynamic air duct: It includes a dynamic air damper 6, a bearing 7, and a baffle 8. The dynamic air damper 6 is installed on the convex shaft 41 of the static air damper 4 through the bearing 7, and axial limit is achieved through the baffle 8. The dynamic air damper 6 is provided with a rotatable air passing area adjustment mechanism, which cooperates with the fixed air passing opening of the static air duct to form an adjustable air passing area.

[0044] (3) Driving device: It includes a stepper motor 3 and a gear 5. The gear 5 is fixed on the output shaft 31 of the stepper motor 3, and the moving air damper 6 is provided with a sector gear 61 meshing with the gear 5. An arc-shaped passage allowing the sector gear 61 to pass through is opened at the lower part of the air duct 2, and the radian angle of the arc-shaped passage is equal to the maximum rotation angle of the moving air damper 6.

[0045] 2. Working principle

[0046] The automatic loading device for testing mine ventilators of the present invention has the following working principle:

[0047] (1) Initial state: When the fan starts the performance test, the moving air damper 6 rotates to a position where it completely overlaps with the air passage of the static air damper 4 (as Figure 1 shown), at this time the loading device is in the no-load state, and the air passage area reaches the maximum value S.

[0048] (2) Loading process: When the driving motor rotates upon receiving a remote instruction, the gear 5 drives the moving air damper 6 to rotate by an angle dθ, reducing the air passage area by dS. The change in the air passage area dS and the rotation angle dθ of the moving air damper satisfy a linear relationship, achieving precise control of the fan load.

[0049] (3) Maximum load state: When the moving air damper 6 rotates to a position where it is completely misaligned with the air passage of the static air damper 4 (as Figure 2 shown), the air passage area drops to zero, and the fan bears the maximum load.

[0050] Specific embodiment 2,

[0051] 3. Loading method

[0052] This embodiment also adopts the method of using the automatic loading device for testing mine ventilators of the present invention for loading tests, including the following steps:

[0053] (1) Control the moving air damper 6 to rotate to the no-load position where it completely overlaps with the air passage of the static air damper 4.

[0054] (2) Through the control of the pulse signal of the stepper motor 3, make the moving air damper 6 rotate by an angle dθ, and calculate the change in the air passage area dS according to the formula dS = 0.5(R 2 - r 2 )dθ * n, and adjust the load of the fan in real time.

[0055] (3) When the moving air damper 6 rotates to a position where it is completely misaligned with the air passage of the static air damper 4, the air passage area drops to zero, apply the maximum load, and complete the loading test.

[0056] In this embodiment, Figure 1 is the overall schematic diagram of the present invention, showing the specific structures of the static air duct, the moving air duct and the driving device, as well as the state when the moving air damper 6 is in the no-load position.Figure 2 This is a schematic diagram of the second state of the present invention, showing the state when the moving air damper 6 rotates to be completely misaligned with the air passage opening of the static air damper 4. At this time, the air passage area drops to zero, and the fan bears the maximum load.

[0057] Through the elaboration of the above specific embodiments, the present invention provides an automatic loading device and method for testing a mine ventilation fan, which has significant advantages such as fast loading speed, high regulation accuracy, and good safety, providing a more reliable technical guarantee for the performance test of the mine ventilation fan.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An automatic loading device for testing a mining ventilator, characterized in that: It consists of three parts: a static air duct, a dynamic air duct and a driving device; the static air duct is provided with a fixed air outlet; the dynamic air duct is provided with a rotatable air outlet adjustment mechanism, and the air outlet adjustment mechanism cooperates with the fixed air outlet of the static air duct to form an adjustable air outlet area; the driving mechanism is connected to the air outlet adjustment mechanism; Among them, the driving mechanism is configured to drive the air outlet adjustment mechanism to rotate through remote control instructions to achieve continuous linear adjustment of the air outlet area from a maximum value to zero.

2. The automatic loading device for testing a mining ventilator according to claim 1, characterized in that: The static air duct comprises a left flange, a wind tube, a static air door and a right flange, wherein the static air door is welded and fixed inside the wind tube, and the left flange and the right flange are respectively welded at two axial ends of the wind tube.

3. The automatic loading device for testing a mining ventilator according to claim 1, characterized in that: The air outlet adjustment mechanism of the dynamic air duct includes a dynamic air door, a bearing and a baffle. The dynamic air door is installed on the convex shaft of the static air door through a bearing, and axial limitation is achieved through the baffle.

4. The automatic loading device for testing a mining ventilator according to claim 1, characterized in that: The driving mechanism comprises a stepping motor and a gear, the gear is fixed to the output shaft of the stepping motor, and the dynamic air door is provided with a sector gear meshing with the gear.

5. The automatic loading device for testing a mining ventilator according to claim 1, characterized in that: The lower part of the air duct is provided with an arc-shaped hole for allowing the sector gear to pass through, and the arc angle of the arc-shaped hole is equal to the maximum rotation angle of the dynamic air door.

6. The automatic loading device for testing a mining ventilator according to claim 1, characterized in that: The maximum value S of the wind-passing area is determined by the following formula: S=0.5*(R 2 -r 2 )*θ*n; Among them, R is the large arc radius of the dynamic air door air outlet, r is the small arc radius, θ is the air outlet angle, and n is the number of air outlets.

7. The automatic loading device for testing a mining ventilator according to claim 1, characterized in that: The change in the air flow area dS and the rotation angle dθ of the dynamic air door satisfy a linear relationship.

8. An automatic loading method for testing a mining ventilator, using an automatic loading device for testing a mining ventilator as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Control the dynamic air door to rotate to the no-load position where the static air door air outlet completely overlaps; use the driving mechanism to rotate the dynamic air door by an angle dθ to reduce the air flow area by dS; When the dynamic air door rotates until the air outlet is completely misaligned, the air flow area is reduced to zero to apply the maximum load.

9. An automatic loading method for testing a mining ventilator according to claim 8, characterized in that: The adjustment process of the dynamic air door rotation angle dθ is controlled by the pulse signal of the stepping motor.

10. The automatic loading method for testing a mining ventilator according to claim 8, characterized in that: The calculation formula of the change in wind area dS is: dS = 0.5*(R 2 -r 2 )*dθ*n.

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