A detection device for calibrating a gas detector

Abstract

The present invention relates to the technical field of verification and calibration devices, and specifically to a detection device for calibration of a gas detector. A detection device for calibration of a gas detector comprises a shell, a buffer device is arranged at the bottom of the shell, an air inlet pipe is penetrated and connected on one side of the shell, and an output pipe and a bypass pipe are penetrated and connected on the other side, one end of the air inlet pipe located inside the shell is connected to the output pipe and the bypass pipe through a three-way pipe, the air inlet pipe is connected to a standard concentration gas cylinder through a pipeline, an output flow meter is arranged on the output pipe, a pressure reducing valve and a bypass flow meter are arranged on the bypass pipe, a connector is fixedly connected to the outlet end of the output pipe, and a touch display is embedded on the outer wall of the shell. The connector arranged in the present invention can be connected to the alarm of various gas detectors, and the output flow meter arranged in the shell can accurately measure the gas flow passing through the output pipe and display it on the touch display.

Description

Technical Field

[0001] The invention relates to the technical field of verification and calibration devices, and in particular to a detection device for calibrating a gas detector. Background Art

[0002] In the industrial production process of petroleum, chemical industry and natural gas, the leakage of flammable gas is a common safety hazard. The leakage of flammable gas may cause equipment damage, environmental pollution, and even cause major explosion accidents. Therefore, in recent years, gas detectors have been widely used, and their demand has shown a rapid growth trend. Before leaving the factory, gas detectors must undergo power-on aging, calibration and testing processes to eliminate failed and defective products, so gas detector verification and calibration devices are required. However, gas detectors include two different types: diffusion alarms and suction alarms. When conducting verification and calibration, it is necessary to select a gas detector verification and calibration device that meets the corresponding type. This is not only more time-consuming, but also the economic cost of purchasing different gas detector verification and calibration devices is higher. Summary of the invention

[0003] The purpose of the present invention is to provide a detection device for calibrating a gas detector, so as to solve the problem that a conventional gas detector verification and calibration device cannot verify and calibrate different alarms.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A detection device for calibrating a gas detector comprises a shell, a buffer device is arranged at the bottom of the shell, an air inlet pipe is penetrated and connected on one side of the shell, and an output pipe and a bypass pipe are penetrated and connected on the other side, one end of the air inlet pipe located inside the shell is connected with the output pipe and the bypass pipe through a three-way pipe, the air inlet pipe is connected with a standard concentration gas cylinder through a pipeline, an output flow meter is arranged on the output pipe, a pressure reducing valve and a bypass flow meter are arranged on the bypass pipe, a connector is fixedly connected to the outlet end of the output pipe, and a touch display is embedded in the outer wall of the shell, and the touch display is electrically connected to the output flow meter, the pressure reducing valve and the bypass flow meter, respectively.

[0006] A further technical solution is that both the output flowmeter and the bypass flowmeter are float flowmeters.

[0007] A further technical solution is that the connector includes a fixed part and a rotating part of an annular structure, one end of the fixed part is fixedly connected to the output pipe, and the other end is rotatably connected to the rotating part, and a rubber ring is provided at one end of the rotating part away from the fixed part, and the rubber ring is connected to the rotating part through a sealing cover, and a plurality of connecting rods are provided inside the sealing cover, the middle part of the connecting rod is rotatably connected to the rotating part, one end of the connecting rod is fixedly connected to the rubber ring, and the other end is provided with a transmission mechanism for controlling the rotation of the connecting rod.

[0008] A further technical solution is that the transmission mechanism includes a movable rod, one end of the movable rod is transmission-connected to the connecting rod via a mating rod, both ends of the mating rod are respectively hinged to the movable rod and the connecting rod, an external thread is provided on the movable rod, a gear is sleeved on the movable rod, an internal thread is provided on the inner wall of the gear, the external thread cooperates with the internal thread, gear teeth are provided on the inner wall of the fixed part, the gear teeth mesh with the gear, a connecting plate is rotatably connected to the side of the gear close to the rotating part, and the top of the connecting plate is fixedly connected to the inner wall of the rotating part.

[0009] A further technical solution is that the buffer device includes a placement box, a placement groove is opened on the top of the placement box, the bottom of the shell is gap-matched with the placement groove, the bottom surface of the shell is fixedly connected to the bottom of the placement groove by a plurality of springs, and a plurality of fixing rods are arranged on the side wall of the shell to prevent the spring from being over-stretched.

[0010] A further technical solution is that a movable groove is provided on the side wall of the shell, the axis of the movable groove is perpendicular to the horizontal plane, both ends of the movable groove are closed ends, the opening size of the movable groove is smaller than the size of the groove bottom, a connecting block is provided in the movable groove, the cross-sectional shape and size of the connecting block are consistent with the cross-sectional shape and size of the movable groove, the top of the fixing rod is fixedly connected to the connecting block, and the bottom is slidably connected to the groove bottom of the placement groove.

[0011] A further technical solution is that an active cavity is arranged inside the bottom plate of the placement box, a fixing hole connected to the bottom of the placement groove is arranged on the top of the active cavity, and a movable plate is arranged inside the active cavity, the top and bottom surfaces of the movable plate are respectively in contact with the cavity top and cavity bottom of the active cavity, the diameter of the movable plate is larger than the aperture of the fixing hole and smaller than the diameter of the active cavity, the bottom of the fixing rod passes through the fixing hole and is fixedly connected to the top surface of the movable plate, and the diameter of the fixing rod is smaller than the aperture of the fixing hole.

[0012] A further technical solution is that a shielding cloth is circumferentially connected to the side wall of the shell, and the side of the shielding cloth away from the shell is circumferentially connected to the upper edge of the placement box.

[0013] A further technical solution is that a supporting mechanism is arranged inside the shielding cloth, and the supporting mechanism includes several sets of matching fixing rings and supporting rods, the bottom of the fixing ring is ball-hinged with the top of the placement box, one end of the support rod is fixedly connected with a round head, and the other end is inclined upward through the fixing ring and then ball-hinged with the outer wall of the shell, one end of the shielding cloth is connected to the fixing ring, and the other end is connected to the hinged end of the support rod.

[0014] A further technical solution is that a first fixing block and a second fixing block are fixedly installed on the top surface of the shell, a circular first matching hole is provided on the side of the first fixing block close to the second fixing block, a circular second matching hole is provided on the side of the second fixing block close to the first fixing block, a handle is provided between the first fixing block and the second fixing block, and the first matching block and the second matching block are fixedly connected to the bottom of the front and rear sides of the handle respectively, one end of the first matching block is inserted into the first matching hole and connected to the bottom of the first matching hole through a reset spring, the second matching block matches with the second matching hole, a polygonal limiting hole is provided on the side where the second matching block contacts the bottom of the second matching hole, the limiting block is matched in the limiting hole, and the limiting block is fixedly connected to the bottom of the second matching hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The connector provided in the present invention can be connected to the alarms of various gas detectors, and the output flow meter provided in the shell can accurately measure the gas flow passing through the output pipe and display it on the touch display. Then, the gas detector being detected can be verified and calibrated according to the data on the touch display. The buffer device provided under the shell not only plays a buffering and protective role for the shell, but also prevents the spring from being deformed due to excessive stretching when force is applied to the shell for transportation and transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the connector in the present invention;

[0019] Figure 3 is a three-dimensional diagram of the housing in the present invention;

[0020] Figure 4 It is a front cross-sectional view of the housing in the present invention;

[0021] Figure 5 It is a structural schematic diagram of the fixing rod in the present invention;

[0022] Figure 6 It is a structural schematic diagram of the support mechanism in the present invention;

[0023] Figure 7 It is a schematic structural diagram of the handle in the present invention.

[0024] Icons: 1-shell, 2-standard concentration gas cylinder, 3-inlet pipe, 4-output pipe, 5-bypass pipe, 6-tee pipe, 7-output flow meter, 8-pressure reducing valve, 9-bypass flow meter, 10-connector, 1001-fixed part, 1002-rotating part, 1003-rubber ring, 1004-sealing cover, 1005-connecting rod, 1006-matching rod, 1007-movable rod, 1008-gear, 1009-gear teeth, 1010-connecting plate, 11-touch display, 12-buffer device, 1201-placement box, 1 202-placing slot, 1203-spring, 1204-fixing rod, 1205-connecting block, 1206-movable slot, 1207-movable plate, 1208-movable cavity, 1209-fixing hole, 13-shielding cloth, 14-fixing ring, 15-support rod, 16-round head, 17-handle, 18-first fixed block, 19-first matching block, 20-reset spring, 21-first matching hole, 22-second fixed block, 23-second matching block, 24-second matching hole, 25-limiting block, 26-limiting hole, 27-heat dissipation hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Figures 1 to 7 This is an embodiment of the present invention.

[0027] Example 1

[0028] A detection device for calibrating a gas detector comprises a shell 1, a buffer device 12 is arranged at the bottom of the shell 1, an air inlet pipe 3 is penetrated and connected on one side of the shell 1, and an output pipe 4 and a bypass pipe 5 are penetrated and connected on the other side, one end of the air inlet pipe 3 located inside the shell 1 is connected with the output pipe 4 and the bypass pipe 5 through a three-way pipe 6, the air inlet pipe 3 is connected with a standard concentration gas cylinder 2 through a pipeline, an output flow meter 7 is arranged on the output pipe 4, a pressure reducing valve 8 and a bypass flow meter 9 are arranged on the bypass pipe 5, a connector 10 is fixedly connected to the outlet end of the output pipe 4, and a touch display 11 is embedded in the outer wall of the shell 1, and the touch display 11 is electrically connected to the output flow meter 7, the pressure reducing valve 8 and the bypass flow meter 9 respectively. After connecting the connector 10 to the alarm inlet on the gas detector to be detected, open the valve on the standard concentration gas cylinder 2, so that the standard concentration gas needs to pass through the shell 1 before entering the gas detector. The output flow meter 7 arranged inside the shell 1 will accurately measure the gas flow passing through the output pipe 4 and display it on the touch display 11, and then calibrate the gas detector to be detected according to the data on the touch display 11. When the alarm type of the gas detector to be detected is a suction type, it is necessary to ensure that the gas in the standard concentration gas cylinder 2 is fully output, but at the same time this will also cause the pressure in the output pipe 4 to be too high, so at this time it is necessary to open the pressure reducing valve 8 on the bypass pipe 5 to balance the pressure. Therefore, the present invention can check and calibrate both diffusion type or suction type gas detectors.

[0029] Specifically, the output flow meter 7 and the bypass flow meter 9 are both float flow meters, which can accurately count the gas flow through the output pipe 4 and the bypass pipe 5 .

[0030] Specifically, a plurality of heat dissipation holes 27 connected to the interior of the housing 1 are provided on the side wall of the housing 1. The heat dissipation holes 27 can dissipate the heat inside the housing 1, thereby reducing the probability of damage to the electrical components inside the housing 1 due to overheating.

[0031] Example 2

[0032] On the basis of Example 1, the connector 10 includes a fixed portion 1001 and a rotating portion 1002 of an annular structure, one end of the fixed portion 1001 is fixedly connected to the output pipe 4, and the other end is rotatably connected to the rotating portion 1002, and a rubber ring 1003 is provided at one end of the rotating portion 1002 away from the fixed portion 1001, and the rubber ring 1003 is connected to the rotating portion 1002 through a sealing cover 1004, and a plurality of connecting rods 1005 are provided inside the sealing cover 1004, and the middle portion of the connecting rod 1005 is rotatably connected to the rotating portion 1002, one end of the connecting rod 1005 is fixedly connected to the rubber ring 1003, and the other end is provided with a transmission mechanism for controlling the rotation of the connecting rod 1005. The connecting rod 1005 can be controlled to flip inward or outward through the transmission mechanism, thereby controlling the aperture size of the rubber ring 1003, so that the connector 10 can be connected to the alarms of various gas detectors. At the same time, the sealing cover 1004 can ensure that the gas entering the gas detector through the output pipe 4 will not leak and affect the detection data.

[0033] Specifically, a telescopic hose may be connected between the connector 10 and the output pipe 4, so that the connector 10 can be connected to an alarm at a farther and higher position to complete the detection work of the gas detector.

[0034] Example 3

[0035] On the basis of Example 2, the transmission mechanism includes a movable rod 1007, one end of which is transmission-connected to the connecting rod 1005 via a matching rod 1006, and the two ends of the matching rod 1006 are respectively hinged to the movable rod 1007 and the connecting rod 1005, an external thread is provided on the movable rod 1007, a gear 1008 is sleeved on the movable rod 1007, an internal thread is provided on the inner wall of the gear 1008, the external thread cooperates with the internal thread, gear teeth 1009 are provided on the inner wall of the fixed part 1001, the gear teeth 1009 are meshed with the gear 1008, and a connecting plate 1010 is rotatably connected to the side of the gear 1008 close to the rotating part 1002, and the top of the connecting plate 1010 is fixedly connected to the inner wall of the rotating part 1002. When it is necessary to control the connecting rod 1005 to flip so as to adjust the aperture size of the rubber ring 1003, force is applied to rotate the rotating part 1002. When the rotating part 1002 rotates, the internal movable rod 1007 will drive the gear 1008 to rotate at the same time. Because the gear 1008 is engaged with the gear teeth 1009 on the inner wall of the fixed part 1001, the gear 1008 will not only rotate around the central axis of the fixed part 1001 but also rotate on its own. The rotation of the gear 1008 will cause the threaded movable rod 1007 to move horizontally inside the rotating part 1002. The horizontal movement of the movable rod 1007 can apply force to the end of the connecting rod 1005 to flip it, thereby completing the adjustment of the aperture size of the rubber ring 1003.

[0036] Example 4

[0037] On the basis of Example 3, the buffer device 12 includes a placement box 1201, a placement slot 1202 is provided on the top of the placement box 1201, the bottom of the housing 1 is clearance-matched with the placement slot 1202, the bottom surface of the housing 1 is fixedly connected to the bottom of the placement slot 1202 via a plurality of springs 1203, and a plurality of fixing rods 1204 are arranged on the side wall of the housing 1 to prevent the springs 1203 from being overstretched. When the housing 1 is subjected to an accidental impact in any direction, the provided springs 1203 can play a buffering role, which can effectively reduce the probability of vibration damage to the components in the housing 1, and when the housing 1 is lifted and moved, the fixing rods 1204 can prevent the springs 1203 from being overstretched for a long time and deformed.

[0038] Example 5

[0039] On the basis of Example 4, a movable groove 1206 is provided on the side wall of the shell 1, the axis of the movable groove 1206 is perpendicular to the horizontal plane, both ends of the movable groove 1206 are closed ends, the opening size of the movable groove 1206 is smaller than the size of the groove bottom, a connecting block 1205 is provided in the movable groove 1206, the cross-sectional shape and size of the connecting block 1205 are consistent with the cross-sectional shape and size of the movable groove 1206, the top of the fixing rod 1204 is fixedly connected to the connecting block 1205, and the bottom is slidably connected to the groove bottom of the placement groove 1202. When the shell 1 is lifted to transfer the present invention, the fixing rod 1204 can prevent the distance between the shell 1 and the placement box 1201 from being too large, and the spring 1203 is over-stretched and deformed.

[0040] Example 6

[0041] On the basis of Example 5, an active cavity 1208 is provided inside the bottom plate of the placement box 1201, a fixing hole 1209 communicating with the bottom of the placement groove 1202 is provided on the top of the active cavity 1208, and an active plate 1207 is provided inside the active cavity 1208, the top and bottom surfaces of the active plate 1207 are in contact with the cavity top and cavity bottom of the active cavity 1208 respectively, the diameter of the active plate 1207 is larger than the aperture of the fixing hole 1209 and smaller than the diameter of the active cavity 1208, the bottom of the fixing rod 1204 passes through the fixing hole 1209 and is fixedly connected with the top surface of the fixing plate 1207, and the diameter of the fixing rod 1204 is smaller than the aperture of the fixing hole 1209. The setting of the active cavity 1208 and the movable plate 1207 enables the fixing rod 1204 to move in any direction within a certain range of the horizontal plane, so that the adaptable housing 1 can move after being accidentally hit in any direction and finally return to its original position under the action of the spring 1203.

[0042] Example 7

[0043] On the basis of Example 6, a shielding cloth 13 is connected around the side wall of the housing 1, and the side of the shielding cloth 13 away from the housing 1 is connected around the upper edge of the placement box 1201. The shielding cloth 13 can prevent foreign objects and impurities from entering the placement box or even the activity cavity, so as to avoid affecting the housing 1 from being damaged by the inability to move and dampen. In addition, the shielding cloth 13 will fold up the redundant cloth under normal conditions, and will unfold it accordingly when the housing 1 moves, ensuring that the shielding cloth 13 will not be torn or damaged.

[0044] Example 8

[0045] On the basis of Example 7, a support mechanism is provided in the shielding cloth 13, and the support mechanism includes several sets of matching fixing rings 14 and supporting rods 15. The bottom of the fixing ring 14 is ball-hinged with the top of the placement box 1201, one end of the supporting rod 15 is fixedly connected with a round head 16, and the other end is ball-hinged with the outer wall of the shell 1 after passing through the fixing ring 14 at an angle upward. One end of the shielding cloth 13 is connected to the fixing ring 14, and the other end is connected to the hinged end of the supporting rod 15. The shielding cloth 13 is tilted by the supporting mechanism, so that foreign matter and impurities dropped on the shielding cloth 13 can slide to the ground, so as to prevent foreign matter and impurities from being retained for a long time and gradually corroding and damaging the shielding cloth 13, and it can ensure that dust and rain from the outside will not enter the inside of the shielding cloth 13 through the gap on the fixing ring 14 along the supporting rod 15. The round head 16 provided at the end of the supporting rod 15 not only prevents the support rod 15 from separating from the fixing ring 14, but also prevents the end of the supporting rod 15 from being too sharp.

[0046] Example 9

[0047] On the basis of Example 8, a first fixing block 18 and a second fixing block 22 are fixedly installed on the top surface of the shell 1, a circular first matching hole 21 is provided on the side of the first fixing block 18 close to the second fixing block 22, and a circular second matching hole 24 is provided on the side of the second fixing block 22 close to the first fixing block 18, a handle 17 is provided between the first fixing block 18 and the second fixing block 22, and a first matching block 19 and a second matching block 23 are fixedly connected to the bottom of the front and rear sides of the handle 17 respectively, one end of the first matching block 19 is inserted into the first matching hole 21 and connected to the bottom of the first matching hole 21 through a reset spring 20, the second matching block 23 matches with the second matching hole 24, and a polygonal limiting hole 26 is provided on the side where the second matching block 23 contacts the bottom of the second matching hole 24, a limiting block 25 is matched in the limiting hole 26, and the limiting block 25 is fixedly connected to the bottom of the second matching hole 24. After the handle 17 is arranged on the top of the shell 1, it is convenient for the staff to apply force to carry the shell 1. When the handle 17 is in use, the limit block 25 and the limit hole 26 are in a matched state, so that the handle 17 cannot be rotated, which can avoid shaking when carrying the shell 1, and is safer and more labor-saving. When the shell 1 needs to be used, the handle 17 can be rotated to the left or right sides to fit with the top surface of the shell 1, thereby reducing the space occupied by the shell 1, and the handle 17 is not easily broken by accidental impact. When the handle 17 needs to be used again, it only needs to apply force to rotate the handle 17 until the limit block 25 is re-matched with the limit hole 26 under the action of the return spring 20, so that the handle 17 can no longer be rotated, and the whole operation process is very easy and labor-saving.

[0048] Working principle: When in use, first connect the standard concentration gas cylinder 2 with the air inlet pipe 3 on the shell 1, and then connect the connector 10 to the alarm of the gas detector to be detected. The size of the connector 10 can be adjusted according to actual conditions, so that it can be suitable for alarms of various specifications. Open the valve on the standard concentration gas cylinder 2 to allow the standard concentration gas to pass through the shell 1 and then enter the gas detector. The output flow meter 7 arranged inside the shell 1 will accurately measure the gas flow through the output pipe 4 and display it on the touch display 11. Then, the gas detector to be detected is calibrated according to the data on the touch display 11. When the gas entering the output pipe 4 causes excessive pressure, the pressure reducing valve 8 on the bypass pipe 5 can be opened to balance the pressure. Therefore, the present invention can check and calibrate both diffusion type or suction type gas detectors.

[0049] When the handle 17 is needed, it is only necessary to apply force to flip and straighten the handle 17, and then the return spring 20 will apply a thrust to the handle 17 so that the handle 17 can finally move, and the limiting hole 26 on the second matching block 23 will match with the limiting block 25 again to ensure that the handle 17 cannot rotate when in use, which can avoid shaking when holding the handle 17 to carry the shell 1, which is safer and more labor-saving. When the handle 17 is no longer needed, force is first applied to control the handle 17 to move closer to the first fixed block 18 until the handle 17 contacts the first fixed block 18, the return spring 20 is compressed, and the limiting hole 26 on the second matching block 23 is disengaged from the limiting block 25, and then force is applied to flip the handle 17 to contact the top surface of the shell 1, so that the occupied space on the top of the shell 1 can be reduced, and the handle 17 is not easily broken by accidental impact;

[0050] When the shell 1 is placed on the ground for work, the shell 1 can be buffered and shock-absorbed under the action of the spring 1203 after being hit in any direction, thereby reducing the probability of vibration damage to the components in the shell 1. At the same time, the fixing rod 1204 can move synchronously with the shell 1. When the shell 1 needs to be lifted for transportation and transfer, the fixing rod 1204 can prevent the shell 1 from being too far away from the placement box 1201, causing the spring 1203 to be over-stretched and deformed. The shielding cloth 13 arranged on the top of the placement box 1201 can prevent foreign objects and impurities from entering the placement box 1201 or even the active cavity 1208, so as to avoid affecting the shell 1 from being unable to move and causing vibration damage.

[0051] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the drawings and claims disclosed herein, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A detection device for calibrating a gas detector, characterized in that: The invention comprises a shell (1), a buffer device (12) is arranged at the bottom of the shell (1), an air intake pipe (3) is passed through and connected to one side of the shell (1), and an output pipe (4) and a bypass pipe (5) are passed through and connected to the other side of the shell (1), one end of the air intake pipe (3) located inside the shell (1) is connected to the output pipe (4) and the bypass pipe (5) through a three-way pipe (6), the air intake pipe (3) is connected to a standard concentration gas cylinder (2) through a pipeline, an output flow meter (7) is arranged on the output pipe (4), a pressure reducing valve (8) and a bypass flow meter (9) are arranged on the bypass pipe (5), a connector (10) is fixedly connected to the outlet end of the output pipe (4), and a touch display (11) is embedded in the outer wall of the shell (1), and the touch display (11) is electrically connected to the output flow meter (7), the pressure reducing valve (8) and the bypass flow meter (9) respectively; The connector (10) comprises a fixed portion (1001) and a rotating portion (1002) of an annular structure, one end of the fixed portion (1001) being fixedly connected to the output pipe (4), and the other end being rotationally connected to the rotating portion (1002), an end of the rotating portion (1002) away from the fixed portion (1001) being provided with a rubber ring (1003), the rubber ring (1003) being connected to the rotating portion (1002) via a sealing cover (1004), a plurality of connecting rods (1005) being provided inside the sealing cover (1004), the middle portion of the connecting rod (1005) being rotationally connected to the rotating portion (1002), one end of the connecting rod (1005) being fixedly connected to the rubber ring (1003), and the other end being provided with a transmission mechanism for controlling the rotation of the connecting rod (1005); The transmission mechanism comprises a movable rod (1007), one end of which is transmission-connected to a connecting rod (1005) via a matching rod (1006), two ends of which are respectively hinged to the movable rod (1007) and the connecting rod (1005), an external thread is provided on the movable rod (1007), a gear (1008) is sleeved on the movable rod (1007), an internal thread is provided on the inner wall of the gear (1008), the external thread matches the internal thread, gear teeth (1009) are provided on the inner wall of the fixed part (1001), the gear teeth (1009) mesh with the gear (1008), a connecting plate (1010) is rotatably connected to a side of the gear (1008) close to the rotating part (1002), and the top of the connecting plate (1010) is fixedly connected to the inner wall of the rotating part (1002).

2. A detection device for calibrating a gas detector according to claim 1, characterized in that: The output flow meter (7) and the bypass flow meter (9) are both float flow meters.

3. The detection device for calibrating a gas detector according to claim 1, characterized in that: The buffer device (12) comprises a placement box (1201), a placement groove (1202) is provided on the top of the placement box (1201), the bottom of the shell (1) is clearance-matched with the placement groove (1202), the bottom surface of the shell (1) is fixedly connected to the bottom of the placement groove (1202) via a plurality of springs (1203), and a plurality of fixing rods (1204) are arranged on the side wall of the shell (1) to prevent the springs (1203) from being overstretched.

4. A detection device for calibrating a gas detector according to claim 3, characterized in that: A movable groove (1206) is provided on the side wall of the shell (1), the axis of the movable groove (1206) is perpendicular to the horizontal plane, both ends of the movable groove (1206) are closed ends, the opening size of the movable groove (1206) is smaller than the size of the groove bottom, a connecting block (1205) is provided in the movable groove (1206), the cross-sectional shape and size of the connecting block (1205) are consistent with the cross-sectional shape and size of the movable groove (1206), the top of the fixing rod (1204) is fixedly connected to the connecting block (1205), and the bottom is slidably connected to the groove bottom of the placement groove (1202).

5. A detection device for calibrating a gas detector according to claim 4, characterized in that: An active cavity (1208) is arranged inside the bottom plate of the placement box (1201), a fixing hole (1209) communicating with the bottom of the placement groove (1202) is arranged at the top of the active cavity (1208), and an active plate (1207) is arranged inside the active cavity (1208), the top surface and the bottom surface of the active plate (1207) are in contact with the cavity top and cavity bottom of the active cavity (1208) respectively, the diameter of the active plate (1207) is larger than the aperture of the fixing hole (1209) and smaller than the diameter of the active cavity (1208), the bottom of the fixing rod (1204) passes through the fixing hole (1209) and is fixedly connected to the top surface of the movable plate (1207), and the diameter of the fixing rod (1204) is smaller than the aperture of the fixing hole (1209).

6. A detection device for calibrating a gas detector according to claim 5, characterized in that: A shielding cloth (13) is circumferentially connected to the side wall of the shell (1), and a side of the shielding cloth (13) away from the shell (1) is circumferentially connected to the upper edge of the placement box (1201).

7. A detection device for calibrating a gas detector according to claim 6, characterized in that: A support mechanism is arranged inside the shielding cloth (13), and the support mechanism comprises a plurality of sets of matching fixing rings (14) and supporting rods (15); the bottom of the fixing ring (14) is ball-jointed with the top of the placement box (1201); one end of the supporting rod (15) is fixedly connected with a round head (16), and the other end is ball-jointed with the outer wall of the shell (1) after passing through the fixing ring (14) at an angle upward; one end of the shielding cloth (13) is connected to the fixing ring (14), and the other end is connected to the hinged end of the supporting rod (15).

8. The detection device for calibrating a gas detector according to claim 1, characterized in that: A first fixing block (18) and a second fixing block (22) are fixedly mounted on the top surface of the shell (1); a first circular matching hole (21) is provided on the side of the first fixing block (18) close to the second fixing block (22); a second circular matching hole (24) is provided on the side of the second fixing block (22) close to the first fixing block (18); a handle (17) is provided between the first fixing block (18) and the second fixing block (22); and first matching holes (24) are fixedly connected to the bottoms of the front and rear sides of the handle (17). A block (19) and a second matching block (23), one end of the first matching block (19) being inserted into the first matching hole (21) and connected to the bottom of the first matching hole (21) through a return spring (20), the second matching block (23) matching with the second matching hole (24), a polygonal limiting hole (26) being provided on the side where the second matching block (23) contacts the bottom of the second matching hole (24), a limiting block (25) matching in the limiting hole (26), and the limiting block (25) being fixedly connected to the bottom of the second matching hole (24).

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