Portable gas detector

Abstract

To provide a portable gas detector that solves the inconvenience of connecting and storing hoses in conventional gas detectors. [Solution] The portable gas detector is equipped with a winding unit and a fall prevention unit 200. By winding the hose around the outside of the winding roller, the hose can be neatly arranged during use. Furthermore, the provided fall prevention unit 200 allows the device to be held securely in the user's hand, effectively preventing the device from falling.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and particularly to a portable gas detector.

Background Art

[0002] A portable gas detector is a device for detecting the concentration of harmful gases in the environment, and is widely used in fields such as industrial safety monitoring, indoor air quality inspection, and environmental protection monitoring. The device can be configured as a single gas or multiple gas detectors, and can detect various gases including VOCs, oxygen, toxic gases, and flammable gases.

[0003] A portable gas detector is often used for hand-held operation in gas detection in a laboratory. However, when it is necessary to detect the gas concentration at a high place indoors, the operator needs to connect a hose of a certain length to extend the detection end. The method of using the extended hose is convenient for detecting at high places, but there is a problem that the storage work after use becomes complicated and the handling property of the operator in the storage work is reduced.

Summary of the Invention

[0004] In view of the problems in the above-mentioned prior art, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a portable gas detector that solves the inconvenience in connecting and storing the hose in a conventional gas detector.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions. The portable gas detector is A winding unit comprising: a winding sleeve having a connecting plate provided inside and a connecting shaft provided on the upper surface of the connecting plate; a gripping member provided inside the winding sleeve and having an upright rod; a winding roller provided outside the connecting shaft; a slide sleeve provided outside the upright rod; a pressing block provided on one side of the slide sleeve; a limit block provided on the surface of the connecting plate; and a fixing block provided on one side of the limit block; A fall prevention unit comprising a slide cover, a slide plate provided inside the slide cover, and a fastening band provided at the end of the slide plate, The surface of the gripping member is in contact with the end of the slide plate.

[0007] In a preferred embodiment of the portable gas detector described in the present invention, the gripping member further comprises a disc provided at the bottom of the upright rod, a connecting rod provided on the side wall of the disc, a gripping rod provided at the end of the connecting rod, and a first spring provided on the side wall of the connecting rod. The connecting rod extends through the winding sleeve to its outside, The interior of the connecting shaft has a hollow structure, and the upright rod extends through the connecting shaft into its interior. The connecting shaft is provided coaxially with the upright rod.

[0008] In a preferred embodiment of the portable gas detector described in the present invention, the slide sleeve comprises a pressing portion provided at its end, an arc groove provided on the side wall of the slide sleeve, and a projection provided on the end side wall of the slide sleeve, A sliding groove is provided in the side wall of the connecting shaft. The projection is fitted into the slide groove, The slide sleeve is provided on the inside of the connecting shaft, and the slide sleeve is fitted onto the outside of the upright rod. The slide sleeve moves along the internal trajectory of the slide groove.

[0009] In a preferred embodiment of the portable gas detector described in the present invention, a guide post is connected to the side wall of the upright rod, and the guide post is fitted into the arc groove. The pressing block is provided with a trapezoidal block at its end, The pressing block extends through the connecting shaft and the winding roller to the outside of the winding roller, The surface of the pressing portion is in contact with the end of the trapezoidal block.

[0010] In a preferred embodiment of the portable gas detector described in the present invention, the winding roller comprises a circular sleeve provided at its end and teeth arranged circumferentially on the inner wall of the circular sleeve, The winding roller is fitted to the outside of the connecting shaft, the end of the winding roller is in contact with the inner wall of the winding sleeve, and the bottom of the circular sleeve is in contact with the surface of the connecting plate.

[0011] In a preferred embodiment of the portable gas detector described in the present invention, the limit block is provided with a second spring on its side wall, A cylinder is connected to the bottom of the limit block, and the limit block rotates along the axis of the cylinder. The second spring biases the end of the limit block to be inserted into the gap between adjacent teeth.

[0012] In a preferred embodiment of the portable gas detector described in the present invention, the fixed block is provided on the surface of the connecting plate, The end of the pressing block is in contact with the side wall of the limit block. The end of the limit block is located away from the gap between two adjacent sets of teeth.

[0013] In a preferred embodiment of the portable gas detector described in the present invention, the slide cover is provided with a rail located inside it. The slide plate comprises a slider provided at its bottom and a third spring provided on the side wall of the slider. The bottom of the slide plate is in contact with the surface of the slide cover. The slider is slidably connected to the rail.

[0014] In a preferred embodiment of the portable gas detector described in the present invention, the clamping band is made of an elastic material. One end of the clamping band is connected to the slider, and the other end is fixed to the inside of the slide cover. The aforementioned clamping band extends through the slide cover to its outside.

[0015] In a preferred embodiment of the portable gas detector described in the present invention, the detection unit comprises a detector body, a detection head, and a hose provided at the end of the detector body, wherein the detector body and the detection head are connected by the hose. The hose extends through the winding sleeve to its outside, and the hose is wrapped around the outer wall of the winding roller.

[0016] The beneficial effects of this invention include the fact that by winding the hose around the outside of the winding roller, the hose can be neatly arranged during use, and the provided fall prevention unit allows the equipment to be held securely in the user's hand, effectively preventing the device from falling, thereby making it more convenient for workers to use. [Brief explanation of the drawing]

[0017] To more clearly explain the technical solution in the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Of course, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts. [Figure 1] It is a schematic diagram showing the structure of a portable gas detector. [Figure 2] It is a schematic diagram showing the connection structure between the winding sleeve and the detector body in the portable gas detector. [Figure 3] It is a schematic diagram showing the positioning structure of the limit block and the winding roller in the portable gas detector. [Figure 4] It is an enlarged view of a part at A in FIG. 3 of the portable gas detector. [Figure 5] It is a schematic diagram showing the extended structure of the tightening band of the portable gas detector. [Figure 6] It is an enlarged view of a part at B in FIG. 5 of the portable gas detector. [Figure 7] It is a schematic diagram showing the disassembled structure of the portable gas detector. [Figure 8] It is an enlarged view of a part at C in FIG. 7 of the portable gas detector. [Figure 9] It is an enlarged view of a part at D in FIG. 7 of the portable gas detector.

Modes for Carrying Out the Invention

[0018] To make the above objects, features, and advantages of the present invention clearer and easier to understand, the following will describe the specific embodiments of the present invention in detail in conjunction with the accompanying drawings of the specification.

[0019] To facilitate a complete understanding of the present invention, many specific details will be described below. However, the present invention can also be implemented in other ways different from those described in this specification, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0020] Furthermore, as used herein, “one embodiment” or “example” refers to a specific feature, structure or property that may be included in at least one embodiment of the present invention. The phrase “in one embodiment” appearing elsewhere in this specification does not all refer to the same embodiment, nor are they separate or selectively mutually exclusive embodiments.

[0021] Example 1 Referring to Figures 3 to 9, Embodiment 1 of the present invention provides a portable gas detector equipped with a winding unit 100, the winding unit 100 comprising: a winding sleeve 101 having a connecting plate 1011 provided inside and a connecting shaft 1012 provided on the upper surface of the connecting plate 1011; a gripping member 102 provided inside the winding sleeve 101 and equipped with an upright rod 1024; a winding roller 103 provided outside the connecting shaft 1012; a slide sleeve 104 provided outside the upright rod 1024; a pressing block 105 provided on one side of the slide sleeve 104; a limit block 106 provided on the surface of the connecting plate 1011; and a fixing block 107 provided on one side of the limit block 106.

[0022] The winding sleeve 101 has a hollow cylindrical structure inside, the connecting plate 1011 is provided inside the winding sleeve 101, and the connecting plate 1011 divides the winding sleeve 101 into an upper cavity and a lower cavity, the connecting shaft 1012 is fixedly connected to the connecting plate 1011 and the inside of the connecting shaft 1012 has a hollow structure, the upright rod 1024 is provided inside the connecting shaft 1012, the gripping member 102 rotates along the axial direction of the connecting shaft 1012, the winding roller 103 is fitted on the outside of the connecting shaft 1012 and the winding roller 103 is movably connected to the connecting shaft 1012, the outer wall of the slide sleeve 104 is in contact with the connecting shaft 1012 and the slide sleeve The inner wall of the hose 104 is in contact with the side wall of the upright rod 1024, and the provided limit block 106, under normal conditions, is driven to reverse under the repulsive force of the second spring 1061, thereby inserting the end of the limit block 106 into the gap between two adjacent sets of teeth 1032. The engagement between the limit block 106 and the teeth 1032 positions the clockwise rotating winding roller 103, making it easier for workers to wind the hose around the outside of the winding roller 103, and ensuring that the hose is securely fixed to the outside of the winding roller 103, effectively preventing the hose from loosening.

[0023] Furthermore, the device is equipped with a fall prevention unit 200, which comprises a slide cover 201, a slide plate 202 provided inside the slide cover 201, and a fastening band 203 provided at the end of the slide plate 202, with the surface of the gripping member 102 in contact with the end of the slide plate 202.

[0024] Furthermore, the slide cover 201 and the detector body 301 are fitted together, the provided slide plate 202 is slidably connected to the slide cover 201, and one end of the clamping band 203 is connected to the end of the slide plate 202. In the normal state, the clamping band 203 is tightly pressed against the side wall of the slide cover 201, and since the provided clamping band 203 is made of an elastic material, it securely holds the worker's hand against the slide cover 201, thereby effectively preventing the device from slipping out of the worker's hand.

[0025] During use, the operator presses the gripping member 102, causing it to rotate along the axis of the upright rod 1024. The rotation of the upright rod 1024 moves the slide sleeve 104, which in turn moves the pressing block 105. The end of the pressing block 105 comes into contact with the side wall of the limit block 106, causing the limit block 106 to invert. Its end then moves along one side away from the teeth 1032. In this state, the winding roller 103 can then be rotated counterclockwise. This allows the hose wound around the outside of the winding roller 103 to be pulled out from inside the winding sleeve 101, extending the hose to a predetermined length. This mechanism enables the detection device to handle gas detection at various height positions.

[0026] During the pressing process of the gripping member 102, the side wall of the gripping member 102 presses against the slide plate 202 as it moves, and the movement of the slide plate 202 moves the tightening band 203. This mechanism ensures that the extended portion of the tightening band 203 remains relaxed, allowing the worker to easily insert their hand into the gap between the tightening band 203 and the slide cover 201. After the pressure of the gripping member 102 is released, the tightening band 203 securely presses the hand against the slide cover 201, effectively preventing the slide cover 201 from falling off the worker's hand.

[0027] As described above, according to the present invention, by winding the hose around the outside of the winding roller, the hose can be neatly arranged during use, and the provided fall prevention unit allows the equipment to be held securely in the user's hand, thereby effectively preventing the device from falling and making it even more convenient for workers to use.

[0028] Example 2 Referring to Figures 1 to 9, the difference between Embodiment 2 and Embodiment 1 of the present invention is that in the portable gas detector, the gripping member 102 further comprises a disc 1023 provided at the bottom of the upright rod 1024, a connecting rod 1022 provided on the side wall of the disc 1023, a gripping rod 1021 provided at the end of the connecting rod 1022, and a first spring 1025 provided on the side wall of the connecting rod 1022. The connecting rod 1022 extends through the winding sleeve 101 to its outside, and the inside of the connecting shaft 1012 has a hollow structure. The upright rod 1024 extends through the connecting shaft 1012 to its inside, and the connecting shaft 1012 is provided coaxially with the upright rod 1024.

[0029] Furthermore, the grip bar 1021 is welded to the connecting rod 1022, and the provided connecting rod 1022 extends through the winding sleeve 101 to its outside, so that the worker can rotate the upright rod 1024 from the outside of the winding sleeve 101. The disc 1023 is welded to the connecting rod 1022, and the disc 1023 is welded to the upright rod 1024, so that the worker can control the grip bar 1021 from the outside to reverse the upright rod 1024 along the axial direction of the connecting shaft 1012, and the provided first spring 1025 can press the connecting rod 1022 while reversing it. In the normal state, by pressing the connecting rod 1022 under the repulsive force of the first spring 1025 while reversing it, the position of the surface of the grip bar 1021 and the position of the slide cover 201 become misaligned with each other.

[0030] Furthermore, the slide sleeve 104 includes a pressing portion 1041 provided at its end, an arc groove 1042 provided on the side wall of the slide sleeve 104, and a projection 1043 provided on the end side wall of the slide sleeve 104. A slide groove 10121 is provided on the side wall of the connecting shaft 1012, the projection 1043 fits into the slide groove 10121, the slide sleeve 104 is provided inside the connecting shaft 1012, the slide sleeve 104 is fitted on the outside of the upright rod 1024, and the slide sleeve 104 moves along the internal trajectory of the slide groove 10121.

[0031] Furthermore, the outer wall of the slide sleeve 104 contacts the inner wall of the connecting shaft 1012, the inner wall of the slide sleeve 104 contacts the side wall of the upright rod 1024, the projection 1043 fits into the slide groove 10121, the projection 1043 is slidably connected to the slide groove 10121, and the slide sleeve 104 moves along the trajectory of the inner wall of the slide groove 10121.

[0032] Furthermore, guide posts 10241 are provided on the side walls of the upright rod 1024, and the guide posts 10241 are fitted into the arc grooves 1042. The pressing block 105 is equipped with a trapezoidal block 1051 at its end, and the pressing block 105 extends through the connecting shaft 1012 and the winding roller 103 to the outside of the winding roller 103, with the surface of the pressing portion 1041 in contact with the end of the trapezoidal block 1051.

[0033] Furthermore, the guide post 10241 is fixedly connected to the upright rod 1024, and the guide post 10241 extends through the arc groove 1042 into its interior. The fitting of the guide post 10241 to the arc groove 1042, and the fitting of the projection 1043 to the slide groove 10121, allows the rotation of the upright rod 1024 to move the slide sleeve 104 along the trajectory inside the slide groove 10121. In addition, the pressing part 1041 has a tapered surface, so when the slide sleeve 104 moves vertically, the surface of the pressing part 1041 presses against the end of the trapezoidal block 1051. Furthermore, when the slide sleeve 104 moves vertically, the pressing block 105 can be moved horizontally.

[0034] Furthermore, the winding roller 103 includes a circular sleeve 1031 provided at its end and teeth 1032 arranged circumferentially on the inner wall of the circular sleeve 1031. The winding roller 103 is fitted to the outside of the connecting shaft 1012, the end of the winding roller 103 is in contact with the inner wall of the winding sleeve 101, and the bottom of the circular sleeve 1031 is in contact with the surface of the connecting plate 1011.

[0035] Furthermore, the winding roller 103 is movably connected to the connecting shaft 1012, and the teeth 1032 provided are arranged and distributed circumferentially on the inner wall of the circular sleeve 1031, thereby forming an internal gear structure inside the teeth 1032. In addition, the winding roller 103 is fitted to the outside of the connecting shaft 1012 and rotates along the axial direction of the connecting shaft 1012.

[0036] Furthermore, the limit block 106 is equipped with a second spring 1061 on its side wall, a cylinder is connected to the bottom of the limit block 106, the limit block 106 rotates along the axis of the cylinder, and the second spring 1061 biases the end of the limit block 106 to be inserted into the gap between adjacent teeth 1032.

[0037] The limit block 106 has an L-shaped structure, and the end of the pressing block 105 presses against the side wall of the limit block 106, causing the limit block 106 to rotate along the axial direction of the cylinder. One end of the second spring 1061 is welded to the side wall of the limit block 106, and the other end is in contact with the surface of the fixing block 107. Under normal conditions, under the repulsive force of the second spring 1061, the end of the limit block 106 is inserted into the gap of the teeth 1032, thereby ensuring the counterclockwise rotation of the winding roller 103 is reliably positioned.

[0038] Furthermore, the fixing block 107 is provided on the surface of the connecting plate 1011, the end of the pressing block 105 is in contact with the side wall of the limit block 106, and the end of the limit block 106 is located away from the gap between two adjacent sets of teeth 1032.

[0039] Furthermore, as the pressing block 105 moves horizontally, its end presses against the side wall of the limit block 106, causing the limit block 106 to rotate along the axis of the cylinder. As a result, the end of the limit block 106 separates from the gap between two adjacent sets of teeth 1032, and the counterclockwise rotation of the winding roller 103 is no longer restricted.

[0040] When using the device, if the worker needs to adjust the position of the detection head 302, they hold the grip bar 1021. When force is applied to the grip bar 1021, it rotates the upright rod 1024 along the axis of the connecting shaft 1012. The rotation of the upright rod 1024 also rotates the guide post 10241, causing the side wall of the guide post 10241 to press against the inner wall of the arc groove 1042. As a result, the slide sleeve 104 moves along the trajectory of the slide groove 10121, causing the slide sleeve 104 to move downward, and the end of the pressing part 1041 comes into contact with the end of the trapezoidal block 1051. When force is applied to 1, it moves horizontally, and the end of the pressing block 105 comes into contact with the side wall of the limit block 106. When force is applied to the limit block 106, it rotates along the axis of the cylinder, and furthermore, the end of the limit block 106 moves away from the position of the teeth 1032. At this time, the second spring 1061 is in a compressed state, and because the end of the limit block 106 moves away from the position of the teeth 1032, the counterclockwise rotation of the winding roller 103 is no longer restricted, thereby allowing the hose wound around the outside of the winding roller 103 to be pulled out to the appropriate length.

[0041] In the normal state, under the repulsive force of the first spring 1025, the connecting rod 1022 is reversed, causing the grip rod 1021 and the slide cover 201 to be misaligned. Additionally, as the upright rod 1024 rotates, the guide post 10241 presses against the inside of the arc groove 1042, causing the slide sleeve 104 to move vertically in the slide groove 10121. This causes the slide sleeve 104 to move upward, and the end of the pressing block 105 no longer presses against the side wall of the limit block 106. Subsequently, under the repulsive force of the second spring 1061, the end of the limit block 106 is inserted between two adjacent sets of teeth 1032, thereby effectively preventing the winding roller 103 from rotating counterclockwise.

[0042] As described above, the interlocking action of the provided gripping member 102 and slide sleeve 104 releases the position restriction of the winding roller 103, making it easier for workers to remove the hose from inside the winding sleeve 101. Furthermore, since the gripping action of the grip bar 1021 matches the gripping action during normal use of the device, it is easy for workers to use.

[0043] Example 3 Referring to Figures 1 to 5, the difference between Embodiment 3 of the present invention and the two embodiments described above is that the slide cover 201 is provided with a rail 2011 inside it, the slide plate 202 is provided with a slider 2021 at its bottom and a third spring 2022 on the side wall of the slider 2021, the bottom of the slide plate 202 is in contact with the surface of the slide cover 201 and the slider 2021 is slidably connected to the rail 2011.

[0044] Furthermore, the slide cover 201 is compatible with the housing structure of the detector body 301, and during use, the slide cover 201 and the detector body 301 are fitted together, ensuring comfort for the worker. In addition, the slide plate 202 is movable along the surface of the slide cover 201, and the movement of the slide plate 202 can press against the third spring 2022, thereby compressing the third spring 2022. The slider 2021 is slidably connected to the rail 2011, and as a result, when the grip bar 1021 presses against the slide plate 202, the slide plate 202 can move along the internal trajectory of the rail 2011.

[0045] Furthermore, one end of the clamping band 203 is connected to the slider 2021, and the other end is secured to the inside of the slide cover 201, with the clamping band 203 extending through the slide cover 201 to its outside.

[0046] Furthermore, since a flexible metal plate is built into the inside of the clamping band 203, good plasticity of the clamping band 203 is guaranteed. Under normal conditions, the third spring 2022 moves the slide plate 202 and the clamping band 203 is in a tensioned state. On the other hand, when the third spring 2022 is compressed, the clamping band 203 becomes loose. This structure makes it easier for workers to insert their hands between the clamping band 203 and the slide cover 201.

[0047] Furthermore, the detection unit 300 comprises a detector body 301, a detection head 302, and a hose 303 provided at the end of the detector body 301. The detector body 301 and the detection head 302 are connected by the hose 303, which extends through the winding sleeve 101 to its outside, and the hose 303 is wrapped around the outer wall of the winding roller 103.

[0048] The winding sleeve 101 is positioned in the housing of the detector body 301, and the winding sleeve 101 and the detector body 301 are detachably connected. The slide cover 201 and the detector body 301 are fitted together, thereby fixing the positions of the winding sleeve 101 and the detector body 301, as well as the slide cover 201 and the detector body 301. Furthermore, the provided hose 303 is wound around and stored inside the winding sleeve 101.

[0049] During use, as the worker grasps the grip bar 1021, the side wall of the grip bar 1021 presses against the end of the slide plate 202, causing it to move. The slider 2021 moves along the trajectory of the rail 2011. While the slider 2021 is moving, the third spring 2022 is compressed. Furthermore, the movement of the slide plate 202 presses against the tightening band 203, causing the tightening band 203 to move to the outside of the slide cover 201. At this point, the space between the tightening band 203 and the slide cover 201 becomes loose. Then, the hand is inserted between the tightening band 203 and the slide cover 201, loosening the gripping force of the grip bar 1021. Under the repulsive force of the third spring 2022, the tightening band 203 tightens the grip between the hand and the slide cover 201, and the grip bar 1021 comes into contact with the worker's hand. This mechanism allows the worker to securely hold the tool in their hand and effectively prevent the tool from falling.

[0050] As described above, the interlocking action between the provided slide plate 202 and gripping member 102 allows the worker to pass their hand through the inside of the tightening band 203, and then, by tightening their hand and making it tightly secure between the band 203 and the slide cover 201, the equipment can be effectively prevented from falling from the worker's hand, thereby freeing the worker's hand to perform other tasks.

[0051] The above-described embodiments are merely for illustrating the technical solutions of the present invention and do not limit them. While the present invention has been described in detail with reference to preferred embodiments, those skilled in the art can modify or substitute equivalents to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and such modifications or substitutions should be included within the claims of the present invention. [Explanation of Symbols]

[0052] 100, winding unit; 101, winding sleeve; 1011, connecting plate; 1012, connecting shaft; 10121, slide groove; 102, gripping member; 1021, grip bar; 1022, connecting rod; 1023, disc; 1024, upright rod; 10241, guide post; 1025, first spring; 103, winding roller; 1031, circular sleeve; 1032, teeth; 104, slide sleeve; 1041, pressing part; 1042, arc groove; 1 043, projection; 105, pressure block; 1051, trapezoidal block; 106, limit block; 1061, second spring; 107, fixing block; 200, fall prevention unit; 201, slide cover; 2011, rail; 202, slide plate; 2021, slider; 2022, third spring; 203, clamping band; 300, detection unit; 301, detector body; 302, detection head; 303, hose.

Claims

1. A winding unit (100) comprising: a winding sleeve (101) having a connecting plate (1011) provided inside thereof and a connecting shaft (1012) provided on the upper surface of the connecting plate (1011); a gripping member (102) provided inside the winding sleeve (101) and having an upright rod (1024); a winding roller (103) provided outside the connecting shaft (1012); a slide sleeve (104) provided outside the upright rod (1024); a pressing block (105) provided on one side of the slide sleeve (104); a limit block (106) provided on the surface of the connecting plate (1011); and a fixing block (107) provided on one side of the limit block (106); The anti-detachment unit (200) comprises a slide cover (201), a slide plate (202) provided inside the slide cover (201), and a fastening band (203) provided at the end of the slide plate (202), A portable gas detector characterized in that the surface of the gripping member (102) is in contact with the end of the slide plate (202).

2. The gripping member (102) further comprises a disc (1023) provided at the bottom of the upright rod (1024), a connecting rod (1022) provided on the side wall of the disc (1023), a gripping rod (1021) provided at the end of the connecting rod (1022), and a first spring (1025) provided on the side wall of the connecting rod (1022), The connecting rod (1022) extends through the winding sleeve (101) to its outside, The interior of the connecting shaft (1012) has a hollow structure, and the upright rod (1024) extends through the connecting shaft (1012) into its interior. The portable gas detector according to claim 1, characterized in that the connecting shaft (1012) is provided coaxially with the upright rod (1024).

3. The slide sleeve (104) comprises a pressing portion (1041) provided at its end, an arc groove (1042) provided on the side wall of the slide sleeve (104), and a projection (1043) provided on the end side wall of the slide sleeve (104), A sliding groove (10121) is provided in the side wall of the connecting shaft (1012). The projection (1043) fits into the slide groove (10121), The slide sleeve (104) is provided on the inside of the connecting shaft (1012), and the slide sleeve (104) is fitted onto the outside of the upright rod (1024). The portable gas detector according to claim 2, characterized in that the slide sleeve (104) moves along the internal trajectory of the slide groove (10121).

4. A guide post (10241) is connected to the side wall of the upright rod (1024), and the guide post (10241) fits into the arc groove (1042). The pressing block (105) is provided with a trapezoidal block (1051) at its end, The pressing block (105) extends through the connecting shaft (1012) and the winding roller (103) to the outside of the winding roller (103), The portable gas detector according to claim 3, characterized in that the surface of the pressing portion (1041) is in contact with the end of the trapezoidal block (1051).

5. The winding roller (103) comprises a circular sleeve (1031) provided at its end and teeth (1032) arranged circumferentially on the inner wall of the circular sleeve (1031), The portable gas detector according to claim 4, characterized in that the winding roller (103) is fitted to the outside of the connecting shaft (1012), the end of the winding roller (103) is in contact with the inner wall of the winding sleeve (101), and the bottom of the circular sleeve (1031) is in contact with the surface of the connecting plate (1011).

6. The limit block (106) is equipped with a second spring (1061) on its side wall, A cylinder is connected to the bottom of the limit block (106), and the limit block (106) rotates along the axis direction of the cylinder. The portable gas detector according to claim 5, characterized in that the second spring (1061) biases the end of the limit block (106) to be inserted into the gap between adjacent teeth (1032).

7. The fixing block (107) is provided on the surface of the connecting plate (1011), The end of the pressing block (105) is in contact with the side wall of the limit block (106), The portable gas detector according to claim 5, characterized in that the end of the limit block (106) is located away from the gap between two adjacent sets of teeth (1032).

8. The slide cover (201) is equipped with a rail (2011) located inside it. The slide plate (202) comprises a slider (2021) provided at its bottom and a third spring (2022) provided on the side wall of the slider (2021), The bottom of the slide plate (202) is in contact with the surface of the slide cover (201), The portable gas detector according to claim 7, characterized in that the slider (2021) is slidably connected to the rail (2011).

9. One end of the clamping band (203) is connected to the slider (2021), and the other end is fixed to the inside of the slide cover (201). The portable gas detector according to claim 8, characterized in that the clamping band (203) penetrates the slide cover (201) and extends to the outside thereof.

10. The detection unit (300) comprises a detector body (301), a detection head (302), and a hose (303) provided at the end of the detector body (301), wherein the detector body (301) and the detection head (302) are connected by the hose (303). The portable gas detector according to claim 9, characterized in that the hose (303) penetrates the winding sleeve (101) and extends to the outside thereof, and the hose (303) is wrapped around the outer wall of the winding roller (103).

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