A military sand and dust test device

Abstract

The present invention relates to the field of environmental testing technology, and specifically to a military sand and dust testing device, comprising an annular air duct, wherein the annular air duct is composed of a ventilation duct, a fan duct, a test product placement duct, a dust detection duct, and a dust collection duct, which are spliced together to form an annular structure. The dust collection duct is provided with a dust collection mechanism, which includes a right-angled fan-shaped box and a transmission assembly. The right-angled fan-shaped box is provided with a first roller, the transmission assembly is used to drive the first roller to flip, the right-angled fan-shaped box is connected to a second roller, the second roller is connected to a cover plate, the dust collection duct is provided with a first arc groove and a second arc groove, the second roller is connected to a first transmission gear, the second arc groove is processed with transmission teeth, the right-angled fan-shaped box is provided with a fixed frame, and the fixed frame is bonded with a dust collection cloth. The present invention flips the right-angled fan-shaped box, and when the wind in the annular air duct flows, the right-angled fan-shaped box is perpendicular to the wind direction, can comprehensively collect sand in the annular air duct, and has a higher sand collection efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental testing, and in particular relates to a military sand and dust testing device. Background Art

[0002] When testing products such as mechanical parts or electronic parts, it is not enough to just test them in a conventional environment. It is also necessary to test them under different environmental conditions. To this end, existing technical means usually simulate the environment and place the product in a simulated environment for testing, so as to test the performance of the product under specific environmental conditions.

[0003] The sand and dust test is a project of environmental testing, the purpose of which is to test the performance of the product in a sand and dust environment. The current sand and dust test chamber usually uses a ring air duct with an industrial fan for simulation. The industrial fan blows air into the ring air duct to form a flowing wind, and then adds sand to the ring air duct. The flowing wind blows the added sand away and makes the sand evenly distributed in the ring air duct, thereby simulating a sand and dust environment. However, after the sand and dust test is completed, there are many inconveniences in collecting the sand in the ring air duct. One of the existing means is to set an opening on the wall of the air duct, such as the closed wide wind speed and high concentration military standard sand and dust test chamber in the existing patent (CN202110523689.6). Figure 2 、 Figure 6 and Figure 7 As shown, the sand collecting port of the sand collecting device is located at the bottom of the air duct. Since the wind circulates in the annular air duct, even if the sand collecting device is turned on, the wind will still circulate in the annular air duct and will not directly enter the sand collecting device in large quantities, resulting in the sand in the wind cannot be completely collected. At the same time, the sand collecting process takes a lot of time. Summary of the Invention

[0004] The purpose of the present invention is to provide a military sand and dust test device to solve the problems existing in the prior art.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0006] A military sand and dust testing device comprises an annular air duct, which is spliced into an annular structure by multiple ventilation ducts, a fan duct, a test product placement duct, a dust detection duct and a dust collection duct. The fan duct is installed with an industrial fan, and a sand adding mechanism is also installed on the upper side of the fan duct; a mounting groove is provided at the bottom of the dust collection duct, and the dust collection duct is provided with a dust collection mechanism, and the dust collection mechanism comprises a right-angled fan box and a transmission assembly, the right-angled fan box is arranged in the mounting groove, and a first roller is fixedly arranged at the center of the circle of the right-angled fan box, the first roller is rotatably connected to one end of the mounting groove, the right-angled fan box is matched with the inner wall of the dust collection duct, one end of the first roller passes through the dust collection duct and extends outward, the transmission assembly is used to drive the first roller to flip, and the upper side of the right-angled fan box is an opening The transmission gear of the present invention is a gear which is connected to the gear of the gear train of the said first and second gears and the gears are connected with the gear of the said gear train respectively.

[0007] Furthermore, the transmission assembly includes a second transmission gear and a linear rack, one end of the first roller passes through the dust collecting pipe and is fixedly connected to the second transmission gear, the outer wall of the dust collecting pipe is fixedly connected to a slide rail, the linear rack is slidably connected to the slide rail, one end of the linear rack is meshed and matched with the second transmission gear, the number of teeth of the linear rack is 1 / 4 of the number of teeth of the second transmission gear, the slide rail is rotatably connected to a screw, the screw passes through the interior of the linear rack and is threadedly connected to the linear rack, and a first motor is also installed on the outer wall of the dust collecting pipe, and the output shaft of the first motor is fixedly connected to the screw.

[0008] Furthermore, two travel switches are provided between the outer wall of the dust collecting duct and the linear rack.

[0009] Furthermore, a protective shell is installed on the outer wall of the dust collecting duct.

[0010] Furthermore, the sand adding mechanism includes a sand dust hopper, a connecting pipe extending into the fan pipeline is fixedly provided at the lower end of the sand dust hopper, and the connecting pipe is provided with an electromagnetic switch valve.

[0011] Furthermore, a dispersion mechanism is installed inside the fan duct, and the dispersion mechanism includes a sleeve and several branch pipes. The sleeve is located inside the fan duct, the upper end of the sleeve is rotatably connected to the connecting pipe, and several branch pipes are connected to the lower end of the sleeve, and the lower end of each branch pipe is provided with several sand leakage holes.

[0012] Furthermore, the bottom of the sleeve is fixedly connected to a connecting rod, the lower end of the connecting rod is fixedly connected to a first bevel tooth, a frame is provided inside the fan pipe, the frame is rotatably connected to a third roller, the third roller is fixedly connected to a second bevel tooth that meshes and matches with the first bevel tooth, and a plurality of fan blades are also provided on the side of the third roller.

[0013] Furthermore, the sample placement pipe is provided with a placement mechanism, which includes a placement basket and a second motor. The placement basket is located inside the sample placement pipe. The second motor is a low-speed motor and is installed at the bottom of the sample placement pipe. The output shaft of the second motor is fixedly connected to a fourth roller, and the fourth roller extends upward to the inside of the sample placement pipe. The fourth roller is fixedly connected to the bottom of the placement basket, and a number of support rods are also fixedly connected to the bottom edge of the placement basket.

[0014] Furthermore, a dust detector is provided inside the dust detection pipe.

[0015] Furthermore, the ventilation duct, the fan duct, the test product placement duct, the dust detection duct and the dust collection duct are all fixedly installed with a placement rack.

[0016] When sand and dust are recovered, the first motor is started to drive the screw to rotate, so that the linear rack slides in the slide rail. Since one end of the linear rack is meshed with the second transmission gear, the linear rack will move from one end meshing with the second transmission gear to the other end meshing with the second transmission gear, and since the number of teeth of the linear rack is 1 / 4 of the number of teeth of the second transmission gear, the second transmission gear will rotate 90°, causing the first roller to rotate 90°, thereby driving the right-angled fan box to flip upward 90°. In the process of the right-angled fan box flipping upward 90°, the second roller moves toward the upper end of the first arc groove, and the first transmission gear moves toward the upper end of the second arc groove. Moreover, since the fixed frame is arranged at the edge of the arc portion of the right-angled fan box, and the dust collecting cloth is bonded to the outside of the fixed frame The dust collecting duct will not be ventilated in the right-angled fan box, and the sand and dust in the annular duct will not fly out through the dust collecting cloth; as the right-angled fan box continues to turn upward to 90 degrees, since a number of transmission teeth are processed on the upper end of the second arc groove, and the number of transmission teeth is 1 / 4 of the number of teeth of the first transmission gear, the first transmission gear can cooperate with the transmission teeth to enable the second roller to drive the cover plate to rotate upward 90 degrees, so that after the right-angled fan box turns upward 90 degrees to fully surround the inner wall of the dust collecting duct, the cover plate will be rotated upward 90 degrees to open. Figure 7 As shown, the wind in the annular air duct can flow through the fixed frame and the dust collecting cloth, and the sand and dust in the wind can be collected in the right-angled fan-shaped box through the dust collecting cloth. Then, by flipping the right-angled fan-shaped box, the right-angled fan-shaped box enters the dust collecting duct and fully surrounds the inner wall of the dust collecting duct. When the wind in the annular air duct flows, the right-angled fan-shaped box is perpendicular to the wind direction, fully collecting the sand in the annular air duct, and the sand collection efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further illustrated by means of the following non-limiting examples.

[0018] Figure 1 This is a schematic diagram of the overall structure of a military sand and dust test device of the present invention;

[0019] Figure 2 This is a structural diagram of a sand collecting pipeline according to a first embodiment of the present invention;

[0020] Figure 3 for Figure 2 An enlarged schematic diagram of the structure of the transmission component at A;

[0021] Figure 4 Schematic diagram of the cross-sectional structure of the sand collecting pipe according to the first embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the installation structure of the fixed frame and the dust collecting cloth according to the first embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the state in which the right-angle fan-shaped box of the first embodiment of the present invention is turned upwards. Figure 1 ;

[0024] Figure 7 This is a schematic diagram of the state in which the right-angle fan-shaped box of the first embodiment of the present invention is turned upwards. Figure 2 ;

[0025] Figure 8 Schematic diagram of the structure of the sand adding mechanism and the dispersion mechanism of the second embodiment of the present invention;

[0026] Figure 9 for Figure 8 A magnified schematic diagram of the structure at B;

[0027] Figure 10 This is a schematic diagram of the structure of the dust detection pipeline and the test product placement pipeline in the third embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of the partial structure of the fourth embodiment of the present invention;

[0029] The main component symbols are described as follows:

[0030] Example 1: annular air duct 100, ventilation duct 101, fan duct 102, test product placement duct 103, dust detection duct 104, dust collection duct 105, industrial fan 106, right-angle fan box 107, first roller 108, second roller 109, cover 110, first arc groove 111, second arc groove 112, first transmission gear 113, transmission gear 114, fixed frame 115, dust collection cloth 116, sand discharge cover 117, second transmission gear 118, linear rack 119, slide rail 120, screw 121, first motor 122, limit switch 123, protective housing 124;

[0031] Example 2: dust hopper 200, connecting pipe 201, electromagnetic switch valve 202, sleeve 203, branch pipe 204, connecting rod 205, first bevel gear 206, frame 207, third roller 208, second bevel gear 209, fan blade 210;

[0032] Example 3: storage basket 300, second motor 301, fourth roller 302, support rod 303, dust detector 304, storage rack 305;

[0033] Embodiment 4: baffle 400 , third motor 401 , guide plate 402 , heating wire 403 . DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0035] Example 1:

[0036] like Figures 1 to 7 The military sand and dust test device shown includes an annular air duct 100, which is spliced into an annular structure by multiple sections of ventilation ducts 101, a fan duct 102, a test product placement duct 103, a dust detection duct 104 and a dust collection duct 105. The fan duct 102 is installed with an industrial fan 106, and a sand adding mechanism is also installed on the upper side of the fan duct 102.

[0037] An installation groove is provided at the bottom of the dust collecting pipe 105, and the dust collecting pipe 105 is provided with a dust collecting mechanism, which includes a right-angled fan-shaped box 107 and a transmission assembly. The right-angled fan-shaped box 107 is arranged in the installation groove, and a first roller 108 is fixedly provided at the center of the right-angled fan-shaped box 107. The first roller 108 is rotatably connected to one end of the installation groove. The right-angled fan-shaped box 107 matches the inner wall of the dust collecting pipe 105, and one end of the first roller 108 passes through the dust collecting pipe 105 and extends outward. The transmission assembly is used to drive the first roller 108 to flip.

[0038] The upper side of the right-angled sector box 107 is open, and the upper side of the right-angled sector box 107 is rotatably connected to the second roller 109 at one end away from the first roller 108. The second roller 109 is fixedly connected to a cover plate 110 that matches the upper side of the right-angled sector box 107.

[0039] The inner wall of the dust collecting pipe 105 is provided with a first arc groove 111 matching the second roller 109, and both ends of the second roller 109 extend into the first arc groove 111. The inner wall of the dust collecting pipe 105 is also provided with a second arc groove 112 connected to the first arc groove 111 on both sides, and both ends of the second roller 109 are fixedly connected to the first transmission gear 113. The upper ends of the second arc grooves 112 on both sides are processed with a number of transmission teeth 114 matching the first transmission gear 113, and the number of teeth of the transmission teeth 114 is 1 / 4 of the number of teeth of the first transmission gear 113.

[0040] A fixed frame 115 is provided at the edge of the arc portion of the right-angled sector box 107 , a dust collecting cloth 116 is bonded to the outside of the fixed frame 115 , and a sand discharge cover 117 is detachably connected to the lower side of the right-angled sector box 107 .

[0041] like Figure 2 and Figure 3As shown, the transmission assembly includes a second transmission gear 118 and a linear rack 119. One end of the first roller 108 passes through the dust collecting pipe 105 and is fixedly connected to the second transmission gear 118. The outer wall of the dust collecting pipe 105 is fixedly connected to a slide rail 120. The linear rack 119 is slidably connected to the slide rail 120. One end of the linear rack 119 is meshed and matched with the second transmission gear 118. The number of teeth of the linear rack 119 is 1 / 4 of the number of teeth of the second transmission gear 118. The slide rail 120 is rotatably connected to a screw 121. The screw 121 passes through the interior of the linear rack 119 and is threadedly connected to the linear rack 119. A first motor 122 is also installed on the outer wall of the dust collecting pipe 105. The output shaft of the first motor 122 is fixedly connected to the screw 121.

[0042] When the industrial fan 106 installed in the fan duct 102 is started, it can blow air into the annular air duct 100; the sand adding mechanism is used to add sand into the fan duct 102; the test product placement duct 103 is used to place the test products; and the dust detection duct 104 is used to monitor the dust concentration in the annular air duct 100.

[0043] In the initial state of the device, if Figures 2 to 4 As shown, under the action of gravity, the cover plate 110 drives the second roller 109 to rotate, sealing the upper side of the right-angled sector box 107. At the same time, one end of the linear rack 119 of the transmission assembly is engaged with the second transmission gear 118. Since the screw 121 is threadedly connected to the linear rack 119, the linear rack 119 will not loosen under the self-locking of the thread, so that the second transmission gear 118 will not rotate, and the right-angled sector box 107 will not be able to be rotated by the first roller 108. At this time, the upper side of the right-angled sector box 107 is flush with the mounting groove and closes the mounting grooves. The lower side of the right-angled sector box 107 is in a vertical downward state, and the two ends of the second roller 108 are at the lower end of the first arc groove 111. The first transmission gears 113 on both sides are at the lower end of the second arc groove 112.

[0044] In the initial state, if Figure 4 As shown, since the upper side of the right-angled fan-shaped box 107 is flush with the installation slot and the installation slots are sealed, and the cover plate 110 seals the upper side of the right-angled fan-shaped box 107, at this time, the annular air duct 100 is in a closed state, and the staff can put the object to be tested into the test object placement pipe 103, and start the industrial fan 106. The industrial fan 106 blows air into the annular air duct 100 to form a flowing wind in the annular air duct 100. The formed wind direction flows from the first roller 108 to the second roller 109, and then sand is added to the fan pipe 102 through the sand adding mechanism. The wind flowing in the annular air duct 100 blows the added sand and dust into the wind, and the dust concentration in the annular air duct 100 is detected by the dust detection pipe 104. Until the dust concentration reaches the test requirements, the sand and dust test can be carried out on the object to be tested.

[0045] After the dust test is over, the dust in the annular air duct 100 needs to be recovered. When the dust is recovered, the first motor 122 is started to drive the screw 121 to rotate, so that the linear rack 119 slides in the slide rail 120. Since one end of the linear rack 119 is meshed with the second transmission gear 118, the linear rack 119 will move from one end to the other end to mesh with the second transmission gear 118, and since the number of teeth of the linear rack 119 is 1 / 4 of the number of teeth of the second transmission gear 118, the second transmission gear 118 will rotate 90°, causing the first roller 108 to rotate 90°, thereby driving the right-angled fan box 107 to flip upward 90°. Since the right-angled fan box 107 matches the dust collecting duct 105, the right-angled fan box 107 can fully surround the inner wall of the dust collecting duct 105. Figure 7 As shown, the lower side of the right-angled fan-shaped box 107 is turned up 90 degrees to close the installation groove, and the upper side of the right-angled fan-shaped box 107 is turned up 90 degrees to enter the dust collecting duct 105, and the annular air duct 100 is in a closed state.

[0046] During the process of the right-angled fan-shaped box 107 flipping up 90 degrees, the second roller 109 moves toward the upper end of the first arc groove 111, and the first transmission gear 113 moves toward the upper end of the second arc groove 112. Since the fixed frame 115 is arranged at the edge of the arc portion of the right-angled fan-shaped box 107, and the dust collecting cloth 116 is adhered to the outside of the fixed frame 115, before the right-angled fan-shaped box 107 flips up to the engagement of the first transmission gear 113 with the transmission gear 114, the upper side of the right-angled fan-shaped box 107 is always closed by the cover plate 110, and the wind in the annular air duct 100 flows through the gap between the right-angled fan-shaped box 107 and the dust collecting pipe 105. There will be no ventilation in 107, and the sand and dust in the annular air duct 100 will not fly out through the dust collecting cloth 116; as the right-angled sector box 107 continues to turn upward to 90 degrees, since a number of transmission teeth 114 are processed on the upper end of the second arc groove 112, and the number of teeth of the transmission teeth 114 is 1 / 4 of the number of teeth of the first transmission gear 113, the first transmission gear 113 cooperates with the transmission teeth 114 to enable the second roller 109 to drive the cover plate 110 to rotate upward 90 degrees, so that after the right-angled sector box 107 turns upward 90 degrees to fully surround the inner wall of the dust collecting duct 105, the cover plate 110 will be rotated upward 90 degrees to open, as shown in FIG. Figure 7As shown, the wind in the annular air duct 100 can flow through the fixed frame 115 and the dust collecting cloth 116, and the sand and dust in the wind can be collected in the right-angled fan-shaped box 107 through the dust collecting cloth 116. Then, by flipping the right-angled fan-shaped box 107, the right-angled fan-shaped box 107 enters the dust collecting pipe 105 and fully surrounds the inner wall of the dust collecting pipe 105. When the wind in the annular air duct 100 flows, the right-angled fan-shaped box 107 is perpendicular to the wind direction, thereby fully collecting the sand in the annular air duct 100, and the sand collection efficiency is higher.

[0047] After dust collection, the industrial fan 106 is turned off, and the transmission assembly drives the linear rack 119 to return to its position. Similarly, the right-angled fan box 107 rotates to its initial state, and the cover plate 110 rotates to cover the upper side of the right-angled fan box 107 to prevent the sand collected in the right-angled fan box 107 from leaking out. Finally, people can open the sand discharge cover 117 and take out the sand inside the right-angled fan box 107.

[0048] Further optimization is made to this embodiment, such as Figure 3 As shown, two travel switches 123 are further provided between the outer wall of the dust collecting duct 105 and the linear rack 119; during the movement of the linear rack 119 relative to the second transmission gear 118, by providing the two travel switches 123, the start and stop control of the first motor 122 can be automatically performed, thereby controlling the travel of the linear rack 119.

[0049] like Figure 5 As shown, a protective shell 124 is also installed on the outer wall of the dust collecting duct 105; the protective shell 124 is used to protect the transmission component to avoid collision damage.

[0050] Example 2:

[0051] On the basis of the first embodiment, the sand adding mechanism is further described. Figures 8 and 9 As shown, the sand adding mechanism includes a sand dust hopper 200 , a connecting pipe 201 extending into the fan duct 102 is fixedly provided at the lower end of the sand dust hopper 200 , and the connecting pipe 201 is provided with an electromagnetic switch valve 202 .

[0052] A dispersion mechanism is also installed inside the fan pipe 102, which includes a sleeve 203 and several branch pipes 204. The sleeve 203 is located inside the fan pipe 102, and the upper end of the sleeve 203 is rotatably connected to the connecting pipe 201. The several branch pipes 204 are all connected to the lower end of the sleeve 203, and the lower end of each branch pipe 204 is provided with several sand leakage holes.

[0053] The bottom of the sleeve 203 is also fixedly connected to a connecting rod 205, the lower end of the connecting rod 205 is fixedly connected to a first bevel gear 206, a frame 207 is provided inside the fan duct 102, the frame 207 is rotatably connected to a third roller 208, the third roller 208 is fixedly connected to a second bevel gear 209 that meshes and matches with the first bevel gear 206, and a plurality of fan blades 210 are also provided on the side of the third roller 208.

[0054] The sand hopper 200 is used to store the sand required for the test. When adding sand, the electromagnetic switch valve 202 is opened. At this time, the sand can enter the fan pipe 102 through the connecting pipe 201. In order to make the sand adding process more dispersed, a dispersion mechanism is set. After the industrial fan 106 is started, the industrial fan 106 blows air into the annular air duct 100 to form a flowing wind in the annular air duct 100. After the sand enters the connecting pipe 201, it can enter the sleeve 203 and each branch pipe 204. The wind blows the fan blades 210, so that the fan blades 210 drive the sand to move. The third roller 208 rotates relative to the frame 207. Since the second bevel teeth 209 of the third roller 208 are engaged with the first bevel teeth 206, the first bevel teeth 206 will drive the connecting rod 205 to rotate, thereby causing the sleeve 203 to rotate relative to the connecting pipe 201, and then causing the branch pipes 204 to rotate. Sand leaks out through the sand leakage holes at the bottom of the rotating branch pipes 204, so that the leaked sand can be dispersed. At the same time, the rotation of the branch pipes 204 will generate centrifugal force, which can spread the sand flat in the branch pipes 204 to avoid accumulation.

[0055] Example 3:

[0056] Based on the second embodiment, further functional optimization is performed, such as Figure 10 As shown, the sample placement pipe 103 is provided with a placement mechanism, which includes a placement basket 300 and a second motor 301. The placement basket 300 is located inside the sample placement pipe 103. The second motor 301 is a low-speed motor and is installed at the bottom of the sample placement pipe 103. The output shaft of the second motor 301 is fixedly connected to a fourth roller 302. The fourth roller 302 extends upward to the inside of the sample placement pipe 103. The fourth roller 302 is fixedly connected to the bottom of the placement basket 300. Several support rods 303 are also fixedly connected to the bottom edge of the placement basket 300.

[0057] The storage basket 300 is used to place the items to be tested. At the same time, in order to fully test the items to be tested, the second motor 301 is started. Since the second motor 301 is a low-speed motor, it can drive the storage basket 300 to rotate. At the same time, the items to be tested will not be thrown due to the centrifugal force generated by the excessive rotation of the storage basket 300. In addition, a support rod 303 is provided at the bottom edge of the storage basket 300 to fully support the storage basket 300.

[0058] A dust detector 304 is provided inside the dust detection pipe 104 . The dust detector 304 can conveniently detect the dust concentration in the annular air duct 100 .

[0059] The ventilation duct 101 , the fan duct 102 , the test product placement duct 103 , the dust detection duct 104 and the dust collection duct 105 are all fixedly installed with a placement rack 305 , which is provided for installing, fixing and supporting the annular air duct 100 .

[0060] Example 4:

[0061] like Figure 11 As shown, a baffle 400 is further provided in the middle of the ventilation duct 101 near the test product placement pipe 103. One end of the baffle 400, which is close to the test product placement pipe 103, is hinged to the inside of the ventilation duct 101. A third motor 401 is installed on the outer wall of the ventilation duct 101. The third motor 401 is used to drive the hinged end of the baffle 400 to rotate.

[0062] When conducting a military-standard dust test, the hinged end of the baffle 400 is driven to rotate by the third motor 401, causing the movable end of the baffle 400 to flip upward, thereby closing the upper side of the ventilation duct 101 and connecting the lower side. The ventilation channel becomes narrower, and wind can only pass through the lower side of the ventilation duct 101, which further increases the wind pressure. At the same time, the wind and sand will directly impact the storage basket 300, thereby conducting a military-standard dust test.

[0063] The annular air duct 100 is also provided with a plurality of arc-shaped guide plates 402 at each corner, and a plurality of electric heating wires 403 are also installed in the annular air duct 100. The guide plates 402 are provided to ensure that the sand flows in the annular air duct 100 in a laminar flow state rather than a flocculent flow state as much as possible, and to suppress the centrifugal effect of the airflow, directing the airflow inward, thereby maintaining the uniformity of the sand flow. The electric heating wires 403 can heat, thereby controlling the temperature of the sand, and can also dehumidify the sand, preventing the dust from being too wet and clumping together.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A military dust test device, comprising an annular air duct, wherein the annular air duct is formed by splicing together multiple ventilation ducts, a fan duct, a test product placement duct, a dust detection duct, and a dust collection duct to form an annular structure, characterized in that: The fan duct is equipped with an industrial fan, and a sand adding mechanism is also installed on the upper side of the fan duct; The bottom of the dust collecting duct is provided with a mounting groove, and the dust collecting duct is provided with a dust collecting mechanism, and the dust collecting mechanism includes a right-angled fan-shaped box and a transmission assembly, the right-angled fan-shaped box is arranged in the mounting groove, a first roller is fixedly provided at the center of the circle of the right-angled fan-shaped box, the first roller is rotatably connected to one end of the mounting groove, the right-angled fan-shaped box is matched with the inner wall of the dust collecting duct, one end of the first roller passes through the dust collecting duct and extends outward, and the transmission assembly is used to drive the first roller to flip, the upper side of the right-angled fan-shaped box is an opening, and the upper side of the right-angled fan-shaped box is rotatably connected to the second roller away from one end of the first roller, and the second roller is fixedly connected to a cover plate matching the upper side of the right-angled fan-shaped box; Both sides of the inner wall of the dust collecting duct are provided with a first arc-shaped groove matching the second roller, and both ends of the second roller extend through the first arc-shaped groove. Both sides of the inner wall of the dust collecting duct are also provided with a second arc-shaped groove connected to the first arc-shaped groove. Both ends of the second roller are fixedly connected to the first transmission gear, and the upper ends of the second arc-shaped grooves on both sides are processed with a plurality of transmission teeth matching the first transmission gear, and the number of teeth of the transmission teeth is 1 / 4 of the number of teeth of the first transmission gear; A fixed frame is provided at the edge of the arc-shaped portion of the right-angled sector box, a dust collecting cloth is bonded to the outside of the fixed frame, and a sand discharge cover is detachably connected to the lower side of the right-angled sector box; The transmission assembly includes a second transmission gear and a linear rack. One end of the first roller passes through the dust collecting pipe and is fixedly connected to the second transmission gear. A slide rail is fixedly connected to the outer wall of the dust collecting pipe. The linear rack is slidably connected to the slide rail. One end of the linear rack is meshed and matched with the second transmission gear. The number of teeth of the linear rack is 1 / 4 of the number of teeth of the second transmission gear. The slide rail is rotatably connected to a screw, which passes through the interior of the linear rack and is threadedly connected to the linear rack. A first motor is also installed on the outer wall of the dust collecting pipe, and the output shaft of the first motor is fixedly connected to the screw.

2. A military dust test device according to claim 1, characterized in that: Two travel switches are also arranged between the outer wall of the dust collecting pipe and the linear rack.

3. A military dust test device according to claim 2, characterized in that: The outer wall of the dust collecting pipe is also provided with a protective shell.

4. A military dust test device according to claim 3, characterized in that: The sand adding mechanism includes a sand dust hopper, a connecting pipe extending into the fan pipeline is fixedly provided at the lower end of the sand dust hopper, and the connecting pipe is provided with an electromagnetic switch valve.

5. A military dust test device according to claim 4, characterized in that: A dispersion mechanism is also installed inside the fan duct, and the dispersion mechanism includes a sleeve and several branch pipes. The sleeve is located inside the fan duct, the upper end of the sleeve is rotatably connected to the connecting pipe, and the several branch pipes are connected to the lower end of the sleeve, and the lower end of each branch pipe is provided with several sand leakage holes.

6. A military dust test device according to claim 5, characterized in that: The bottom of the sleeve is also fixedly connected to a connecting rod, the lower end of the connecting rod is fixedly connected to a first bevel tooth, a frame is provided inside the fan pipe, the frame is rotatably connected to a third roller, the third roller is fixedly connected to a second bevel tooth that meshes and matches with the first bevel tooth, and a plurality of fan blades are also provided on the side of the third roller.

7. A military dust test device according to claim 6, characterized in that: The sample placement pipe is provided with a placement mechanism, which includes a placement basket and a second motor. The placement basket is located inside the sample placement pipe. The second motor is a low-speed motor and is installed at the bottom of the sample placement pipe. The output shaft of the second motor is fixedly connected to a fourth roller. The fourth roller extends upward through the sample placement pipe. The fourth roller is fixedly connected to the bottom of the placement basket. Several support rods are also fixedly connected to the bottom edge of the placement basket.

8. A military dust test device according to claim 7, characterized in that: A dust detector is provided inside the dust detection pipeline.

9. A military dust test device according to claim 8, characterized in that: The ventilation duct, the fan duct, the test product placement duct, the dust detection duct and the dust collection duct are all fixedly installed with a placement rack.

Images