Exhaust gas detection device for confined space

Abstract

The utility model discloses a waste gas detection device for a limited space, which comprises a protection box, a reciprocating screw rod rotatably mounted in the protection box and a motor fixedly mounted in the protection box, the reciprocating screw rod extends along the vertical direction, and an output shaft of the motor is fixedly connected to one end of the reciprocating screw rod. The reciprocating screw rod is movably sleeved with a reciprocating ring, a sliding block is fixedly installed on the reciprocating ring, and the sliding block is inserted into a spiral groove of the reciprocating screw rod; two guide parts are further fixedly installed in the protection box and located on the two sides of the reciprocating lead screw, the two sides of the reciprocating ring are installed on the guide parts in a sliding mode respectively, the waste gas detector is fixedly installed on the reciprocating ring, and under driving of the motor, the reciprocating lead screw can drive the waste gas detector to move in a reciprocating mode in the vertical direction. The waste gas detection device is simple in structure, the reciprocating lead screw is driven to rotate through the motor, the waste gas detector is driven to reciprocate in the vertical direction, an overlong sampling tube is avoided, and the accuracy of detection data is improved.

Description

Technical Field

[0001] The utility model relates to an exhaust gas detection device for a confined space. Background Technique

[0002] Since the confined space is in a semi-closed or fully-closed state, and the inlet and outlet are relatively narrow with poor ventilation, it is easy to accumulate harmful and toxic gases. Therefore, when it is necessary to enter the confined space for operation, it is necessary to first perform forced ventilation on the confined space to reduce the exhaust gas concentration in the confined space. Although after forced ventilation treatment, the exhaust gas concentration in the confined space may still cause harm to the operators. Therefore, during the operation process, it is still necessary to continuously monitor the exhaust gas concentration in the confined space.

[0003] When detecting the exhaust gas concentration, it is necessary to continuously detect the exhaust gas concentration in the upper and lower parts of the confined space, so as to be able to inspect both the exhaust gas heavier than air and the exhaust gas lighter than air. When performing exhaust gas detection, generally the same detection instrument is moved up and down to detect the exhaust gas concentration in different areas. To move the detection instrument up and down, in the patent with the patent number 202221754580X and the name of a dynamic monitoring device for preventing poisoning accidents in confined spaces, the detection end of the detection instrument is fixed on the sliding rod, the connecting rod on the motor shaft is clamped on the outer limit ring through the limit slider, and an incomplete gear meshing with the rack on the sliding rod is arranged at the end of the outer limit ring. Then when the motor rotates, the incomplete gear can rotate around its rotating shaft, thereby driving the sliding rod to move up and down, and then driving the detection end to move up and down to detect the exhaust gas concentration at different heights. Although this device can smoothly move the detection end up and down, the number of components of this device is large, resulting in inconvenient maintenance.

[0004] In addition, this detection device only moves the detection end of the detection instrument, resulting in a need for a longer sampling tube. Due to a large amount of other substances remaining in the sampling tube, the detection data has a large error. Therefore, it is necessary to improve the existing exhaust gas detection device. Content of the Utility Model

[0005] To solve the problem in the prior art that when using mobile sampling for exhaust gas in a confined space, due to the use of a long sampling tube, large errors occur in the detection data, the present application proposes an exhaust gas detection device for a confined space, which includes a protection box, a reciprocating lead screw rotatably installed in the protection box, and a motor fixedly installed in the protection box. The reciprocating lead screw extends in the vertical direction, and the output shaft of the motor is fixedly connected to one end of the reciprocating lead screw. A reciprocating ring is movably sleeved on the reciprocating lead screw, and a slider is fixedly installed on the reciprocating ring. The slider is inserted into the helical groove of the reciprocating lead screw. Two guiding members are also fixedly installed in the protection box. The two guiding members are located on both sides of the reciprocating lead screw, and both sides of the reciprocating ring are slidably installed on a guiding member respectively. The exhaust gas detector is fixedly installed on the reciprocating ring. Driven by the motor, the reciprocating lead screw can drive the exhaust gas detector to reciprocate in the vertical direction.

[0006] The structure of the present application is simple. The rotation of the reciprocating lead screw is driven by the motor, so as to drive the reciprocating ring to reciprocate in the vertical direction through the slider, and synchronously drive the exhaust gas detector to reciprocate in the vertical direction, thereby detecting the exhaust gas concentration at different heights in the confined space. Since the present application can directly drive the exhaust gas detector to move in the vertical direction, avoiding the use of an overly long sampling tube, it can effectively improve the accuracy of the detection data. The present application cancels the complex power transmission mechanism in the prior art, and directly uses the reciprocating lead screw to drive the exhaust gas detector to reciprocate in the vertical direction, reducing the number of components of the equipment, facilitating maintenance, and being able to reduce the maintenance cost.

[0007] Specifically, to reduce the resistance when the reciprocating lead screw rotates, the lower end of the reciprocating lead screw is rotatably installed on the bottom plate of the protection box through a bearing, and the output shaft of the motor is connected to the top end of the reciprocating lead screw.

[0008] Specifically, the guiding member is a guiding rod, and both sides of the reciprocating ring are respectively sleeved on the guiding rod through guiding holes. Or the guiding member is a slide rail, and a chute is respectively arranged on both sides of the reciprocating ring, and the chute is slidably clamped on the slide rail. The specific form of the guiding member can be selected according to different needs.

[0009] Furthermore, one side of the protection box has two panels arranged oppositely in the horizontal direction. The two panels are spaced apart in the horizontal direction, and a detection window is formed between the two panels. The detection window communicates the inside and outside of the protection box, and the exhaust gas detector can perform detection through the detection window. An activity door is arranged in the protection box, and the activity door can close or open the detection window. When the exhaust gas detection device is working, the activity door is opened to open the detection window, so that the exhaust gas detector can detect the exhaust gas in the confined space through the detection window. When the detection is completed, the activity door can be closed to close the detection window, avoiding damage to the exhaust gas detector caused by external sundries, waste water, etc.

[0010] Specifically, for the convenience of opening and closing the movable door, a movable door is provided corresponding to each panel. Each movable door is connected to a side plate of the protection box through a piston cylinder, and the piston rod of the piston cylinder can push the movable doors against each other to close the detection window.

[0011] Furthermore, for the convenience of warning the staff working in the confined space, an alarm system is also provided. The alarm system includes a central processing unit, an exhaust gas detector and an alarm connected to the central processing unit, where:

[0012] The central processing unit is used to receive the detection data of the exhaust gas detector, compare the information with a preset value, and activate the alarm when the detection data ≥ the preset value;

[0013] The exhaust gas detector sends the detected detection data to the central processing unit;

[0014] The alarm receives the control of the central processing unit and emits an alarm sound according to the instruction of the central processing unit. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present application.

[0016] Figure 2 is Figure 1 the view in the A-A direction in

[0017] Figure 3 is a schematic structural diagram of another embodiment of the present application. Detailed Embodiment

[0018] Referring to Figure 1 and Figure 2 , in the drawings, the first arrow X represents the first axis direction, the second arrow Y represents the second axis direction, and both the first axis direction and the second axis direction extend along the horizontal direction and are perpendicular to each other.

[0019] An exhaust gas detection device for a confined space includes a protection box 10, a reciprocating lead screw 31, a motor 33 and an alarm system. The protection box 10 includes a peripheral wall extending in the vertical direction, a bottom plate 12 welded to the top of the peripheral wall, and a top plate 13 welded to the bottom of the peripheral wall. The peripheral wall includes a back plate 11 and two side plates 14. The back plate extends in the first axis direction, and the two side plates are welded on both sides of the back plate 11 in the first axis direction. The two side plates both extend in the second axis direction towards the same direction, and a panel 15 is welded on the side of each of the two side plates facing away from the back plate. The two panels 15 both extend in the first axis direction and are spaced apart, and a detection window 18 is formed between the two panels, and the detection window communicates with the inside and outside of the protection box.

[0020] The reciprocating lead screw 31 is arranged vertically. A bearing block 35 is fixedly installed on the bottom plate 12 by bolts. The lower end of the reciprocating lead screw 31 is rotatably installed on this bearing block through a bearing 36. The motor is fixedly installed on the back plate and is located above the reciprocating lead screw. The output shaft 331 of the motor extends downward and is connected to the connecting shaft 341 at the top of the reciprocating lead screw through a coupling 34.

[0021] Inside the protection box, two vertical plates 21 are welded vertically. The two vertical plates extend along the second axis direction and are respectively located on the left and right sides of the reciprocating lead screw 31. On the side of each vertical plate facing away from the back plate, a slide rail 22 is fixedly installed. The slide rail and the vertical plate together form a guiding member. A reciprocating ring 23 is movably sleeved on the reciprocating lead screw 31. On both sides of the reciprocating ring 23 in the first axis direction, a connecting ear 24 is installed respectively, and a chute 25 is provided on each connecting ear 24. Each chute 25 corresponds to a slide rail 22, and the chute is clamped on the corresponding slide rail. A slider 26 is fixedly installed on the reciprocating ring, and this slider is inserted into the spiral groove 32 of the reciprocating lead screw 31. The exhaust gas detector 41 is fixedly installed on the reciprocating ring. Driven by the motor, the reciprocating lead screw can drive the exhaust gas detector to reciprocate vertically, and enable the exhaust gas detector 41 to perform detection through the detection window.

[0022] Corresponding to each panel, a movable door 16 is slidably installed inside the protection box. The movable door 16 extends along the first axis direction, and the movable door is located inside the corresponding panel. Corresponding to each movable door 16, two piston cylinders are provided. In this embodiment, the piston cylinder specifically uses a pneumatic cylinder 17. The pneumatic cylinder extends along the first axis direction. The cylinder barrel 171 of the pneumatic cylinder is fixed on the inner surface of the side plate, and the piston rod 172 of the pneumatic cylinder is fixed on the movable door. The piston rod can drive the movable door to move along the first axis direction to close or open the detection window.

[0023] The alarm system includes a central processing unit 101, the exhaust gas detector 41 and an alarm 102 connected to the central processing unit 101, where:

[0024] The central processing unit is used to receive the detection data of the exhaust gas detector, and compare the information with a preset value. When the detection data ≥ the preset value, the alarm is started;

[0025] The exhaust gas detector sends the detected detection data to the central processing unit;

[0026] The alarm receives the control of the central processing unit and emits an alarm sound according to the instruction of the central processing unit. In this embodiment, the central processing unit uses a 32-bit PLC programmable controller.

[0027] When the exhaust gas detection device is working, the piston rod of the pneumatic cylinder retracts, driving the two movable doors to move away from each other, opening the detection window, enabling the exhaust gas detection device to detect the exhaust gas concentration in the confined space, and sending the detection data to the central processing unit. The central processing unit compares the received detection data with the preset value. When the detection data ≥ the preset value, the alarm is activated to notify the staff working in the confined space. After the exhaust gas detection work is completed, the piston rod of the pneumatic cylinder extends, pushing the two movable doors to move towards each other and pressing against each other to close the detection window, avoiding unnecessary damage to the exhaust gas detector in the protection box caused by external sundries, waste water, etc.

[0028] In this embodiment, the guiding member is jointly formed by a slide rail and a vertical plate. It can be understood that in another embodiment, please refer to Figure 3 , the guiding member can also adopt a guiding rod 28, and a guiding hole 27 is provided on the connecting ear so that the connecting ear sleeved the guiding hole on the guiding rod.

Claims

1. An exhaust gas detection device for a confined space, characterized in that, It includes a protection box, a reciprocating lead screw rotatably installed in the protection box, and a motor fixedly installed in the protection box. The reciprocating lead screw extends in the vertical direction, and the output shaft of the motor is fixedly connected to one end of the reciprocating lead screw. A reciprocating ring is movably sleeved on the reciprocating lead screw, and a slider is fixedly installed on the reciprocating ring. The slider is inserted into the helical groove of the reciprocating lead screw. Two guiding members are also fixedly installed in the protection box. The two guiding members are located on both sides of the reciprocating lead screw. Both sides of the reciprocating ring are slidably installed on a guiding member respectively. The exhaust gas detector is fixedly installed on the reciprocating ring. Driven by the motor, the reciprocating lead screw can drive the exhaust gas detector to reciprocate in the vertical direction.

2. The exhaust gas detection device according to claim 1, characterized in that, The lower end of the reciprocating lead screw is rotatably installed on the bottom plate of the protection box through a bearing, and the output shaft of the motor is connected to the top end of the reciprocating lead screw.

3. The exhaust gas detection device according to claim 1, characterized in that The guiding member is a guiding rod, and both sides of the reciprocating ring are respectively sleeved on the guiding rod through guiding holes.

4. The exhaust gas detection device according to claim 1, characterized in that The guiding member is a slide rail, and a chute is respectively arranged on both sides of the reciprocating ring, and the chute is slidably clamped on the slide rail.

5. The exhaust gas detection device according to claim 1, characterized in that One side of the protection box has two panels arranged oppositely in the horizontal direction. The two panels are spaced apart in the horizontal direction, and a detection window is formed between the two panels. The detection window communicates with the inside and outside of the protection box. The exhaust gas detector can perform detection through the detection window. An activity door is arranged in the protection box, and the activity door can close or open the detection window.

6. The exhaust gas detection device according to claim 5, characterized in that, Corresponding to each panel, an activity door is provided. Each activity door is connected to a side plate of the protection box through a piston cylinder. The piston rod of the piston cylinder can push the activity doors to press against each other to close the detection window.

7. The exhaust gas detection device according to claim 1, characterized in that An alarm system is also provided. The alarm system includes a central processing unit, the exhaust gas detector and an alarm connected to the central processing unit, wherein: The central processing unit is used for receiving the detection data of the exhaust gas detector, comparing the information with a preset value, and starting the alarm when the detection data ≥ the preset value; The exhaust gas detector sends the detected detection data to the central processing unit; The alarm receives the control of the central processing unit and emits an alarm sound according to the instruction of the central processing unit.

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