Coal mine negative pressure sampler
By introducing a marking rod and a screw adjustment assembly into the coal mine negative pressure sampler, the problem of difficult valve operation in dim environments is solved, the valve can be accurately controlled in dim environments, and the effectiveness of gas collection is improved.
Patent Information
- Application Number
- CN202422497353.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-10-16
AI Technical Summary
In dim environments, it is difficult for workers to accurately judge whether the valve knob of the existing coal mine negative pressure sampler is turned to the appropriate position, making it difficult for the sampler to collect effective gas.
A coal mine negative pressure sampler was designed, which uses a marking rod and a screw adjustment assembly. The position of the valve stem assembly can be judged by touching the marking rod, ensuring that the opening and closing of the valve can be accurately controlled in a dim environment.
It improves the applicability of operation in dim environments and ensures the effectiveness and accuracy of gas collection.
Smart Images
Figure CN223413053U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal mine sampling, in particular to a coal mine negative pressure sampler. Background Art
[0002] The coal mining negative pressure sampler is a sampling tool designed based on the negative pressure principle. It can effectively collect gas samples in complex environments such as underground coal mines. It is widely used in fields such as coal mine safety monitoring, environmental protection, and gas composition analysis. The negative pressure sampler creates a negative pressure environment, drawing gases released during coal mining into the sampler.
[0003] like Figure 1 The existing coal mine negative pressure sampler shown in the figure includes a gas storage cylinder with a valve seat at the top, a gas outlet head, a sampling head, and a knob on the valve seat. A piston rod is provided at the bottom of the gas storage cylinder. Pulling the handle at the lower end of the piston rod can create negative pressure in the gas storage cylinder. When collecting gas, the gas outlet head and the sampling head are turned on and off by the knob. However, because the knob is turned to control the connection and disconnection of the gas outlet head and the sampling head, in relatively dim scenes, staff sometimes cannot accurately judge whether the knob is turned to the appropriate position, resulting in difficulty in the sampler collecting effective gas and poor applicability. Utility Model Content
[0004] In response to the above problems, the utility model proposes a coal mine negative pressure sampler to solve the shortcomings of existing negative pressure samplers, in which in relatively dim scenes, workers sometimes cannot accurately judge whether the valve knob is turned to the appropriate position, resulting in the sampler having difficulty collecting effective gas.
[0005] To achieve the purpose of the utility model, the utility model is implemented through the following technical solutions: a coal mine negative pressure sampler, including an air storage cylinder, a valve seat is provided on the top of the air storage cylinder, a piston rod with a handle is provided on the bottom of the air storage cylinder, and an air chamber, a first flow cavity and a second flow cavity are opened in the valve seat;
[0006] A sampling head is provided at the upper end of the valve seat, and an air outlet head is provided on the side of the valve seat. The air outlet head is connected to the air chamber through the second flow cavity, and the valve seat is connected to the air chamber through the first flow cavity. A valve stem assembly for controlling the opening and closing of the first flow cavity and the second flow cavity is slidingly provided in the valve seat;
[0007] A limiting hole is provided on the side of the air outlet head away from the valve seat, and a first marking rod is slidably provided in the limiting hole. One end of the first marking rod is fixedly connected to the valve stem assembly, and the other end of the first marking rod is fixedly connected to the second marking rod, which is slidably connected to the limiting hole.
[0008] Further improvements are: the valve stem assembly structure includes a valve stem that is arranged through the valve seat, and two valve blocks are fixed on the outside of the valve stem. The valve blocks are slidably connected to the valve cavity opened in the valve seat, and the valve cavity is connected to the air chamber, the first flow cavity and the second flow cavity. One of the valve blocks cooperates with the air inlet of the second flow cavity, and the other valve block is staggered with the air outlet of the first flow cavity.
[0009] A further improvement is that: a screw adjustment component for pushing the valve stem to move horizontally is provided on the side of the valve seat away from the air outlet head, and the screw adjustment component is detachably connected to the valve seat.
[0010] Further improvements are: the screw adjustment assembly includes a knob, a threaded seat and a screw, the threaded seat is detachably connected to the outside of the valve seat, one end of the screw penetrates into the valve cavity and is rotatably connected to the valve stem, the other end of the screw is fixedly connected to the knob, the threaded seat is sleeved on the outside of the screw, and the threaded seat is threadedly connected to the screw.
[0011] A further improvement is that a plurality of fixing bolts are assembled on the threaded seat, and the fixing bolts pass through the threaded seat and are threadedly connected with bolt holes opened on the outside of the valve seat.
[0012] A further improvement is that a sealing rubber ring is fixedly connected to the side of the threaded seat facing the valve seat, and the sealing rubber ring fits the valve cavity.
[0013] A further improvement is that a plurality of strip-shaped edges are provided on the outside of the knob, the strip-shaped edges are fixedly connected to the knob, and each strip-shaped edge is parallel to the axis of the knob.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] When collecting gas, the piston rod is pulled downward, creating negative pressure within the reservoir. The valve stem assembly then slides left and right to control the flow chamber. The marking rod allows operators to determine whether the valve stem assembly has moved to the correct position by touching it in dimly lit environments, enhancing its usability. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0017] Figure 1 The present invention is a structural diagram of an existing coal mine negative pressure sampler.
[0018] Figure 2 It is a structural diagram of the gas storage cylinder in the utility model.
[0019] Figure 3 It is a structural diagram of the interior of the valve seat in the utility model.
[0020] Figure 4 It is a structural diagram of the threaded seat in the utility model.
[0021] Among them: 1. Handle; 2. Piston rod; 3. Air cylinder; 4. Air outlet head; 5. Sampling head; 6. Valve seat; 7. Knob; 8. Threaded seat; 9. Screw; 10. Air chamber; 11. First flow chamber; 12. Second flow chamber; 13. Valve block; 14. Valve chamber; 15. Valve stem; 16. First marking rod; 17. Second marking rod; 18. Fixing bolt. DETAILED DESCRIPTION
[0022] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0023] according to Figure 2 、 3 As shown in Figures 4 and 5, a coal mine negative pressure sampler is proposed in this embodiment, including an air storage cylinder 3, a valve seat 6 is provided on the top of the air storage cylinder 3, a piston rod 2 with a handle 1 is provided at the bottom of the air storage cylinder 3, and an air chamber 10, a first flow cavity 11 and a second flow cavity 12 are formed in the valve seat 6;
[0024] When collecting gas, the piston rod 2 is pulled downward, and the piston rod 2 will form a negative pressure in the gas storage cylinder 3.
[0025] A sampling head 5 is provided at the upper end of the valve seat 6, and an air outlet head 4 is provided on the side of the valve seat 6. The air outlet head 4 is connected to the air chamber 10 through the second flow chamber 12. The valve seat 6 is connected to the air chamber 10 through the first flow chamber 11. A valve stem assembly for controlling the opening and closing of the first flow chamber 11 and the second flow chamber 12 is slidably provided in the valve seat 6;
[0026] The valve stem assembly controls the opening of the first flow chamber 11 and the closing of the second flow chamber 12. Under the action of negative pressure, the air in the sampling area is drawn into the gas reservoir 3 through the valve seat 6, the first flow chamber 11, and the air chamber 10. The valve stem assembly controls the closing of the first flow chamber 11 and the opening of the second flow chamber 12, pushing the piston rod 2 upward. The gas collected in the gas reservoir 3 is discharged through the air chamber 10, the second flow chamber 12, and the gas outlet head 4, completing the sampling.
[0027] A limiting hole is provided on the side of the air outlet head 4 away from the valve seat 6, and a first marking rod 16 is slidably provided in the limiting hole. One end of the first marking rod 16 is fixedly connected to the valve stem assembly, and the other end of the first marking rod 16 is fixedly connected to a second marking rod 17, which is slidably connected to the limiting hole.
[0028] The valve stem assembly controls the opening and closing of the first flow chamber 11 and the second flow chamber 12 by sliding left and right. The first marking rod 16 is fixed to the valve stem assembly. When the first marking rod 16 is completely in the limiting hole, the second flow chamber 12 is in a closed state. When the first marking rod 16 is completely pushed out of the limiting hole, the second flow chamber 12 is in an open state. In a dim environment, the operator can judge whether the valve stem assembly has moved to the appropriate position by touching the first marking rod 16 and the second marking rod 17, which has better applicability.
[0029] About the valve stem assembly:
[0030] The valve stem assembly structure includes a valve stem 15 that is arranged through the valve seat 6, and two valve blocks 13 are fixed on the outside of the valve stem 15. The valve block 13 is slidably connected to the valve cavity 14 opened in the valve seat 6. The valve cavity 14 is connected to the air chamber 10, the first flow cavity 11 and the second flow cavity 12. One of the valve blocks 13 cooperates with the air inlet of the second flow cavity 12, and the other valve block 13 is staggered with the air outlet of the first flow cavity 11.
[0031] The valve blocks 13 can slide along the valve cavity 14. When one of the valve blocks 13 moves to the air inlet of the second flow cavity 12, the second flow cavity 12 is closed, the first flow cavity 11 is opened, and the external gas is drawn into the gas cylinder 3 through the valve seat 6 and the first flow cavity 11. When the other valve block 13 moves to the air outlet of the first flow cavity 11, the second flow cavity 12 is opened, the first flow cavity 11 is closed, and the gas in the gas cylinder 3 is discharged outward through the second flow cavity 12 and the gas outlet head 4.
[0032] Regarding the movement control of the valve stem 15, please refer to the following description.
[0033] A screw adjustment assembly for pushing the valve stem 15 to move horizontally is provided on the side of the valve seat 6 away from the gas outlet head 4, and the screw adjustment assembly is detachably connected to the valve seat 6. The horizontal movement of the valve stem 15 is controlled by the screw adjustment assembly.
[0034] More specifically, the screw adjustment assembly includes a knob 7, a threaded seat 8, and a screw 9. The threaded seat 8 is detachably connected to the outside of the valve seat 6. One end of the screw 9 penetrates the valve cavity 14 and is rotatably connected to the valve stem 15. The other end of the screw 9 is fixedly connected to the knob 7. The threaded seat 8 is sleeved on the outside of the screw 9, and the threaded seat 8 is threadedly connected to the screw 9. When the knob 7 is turned, the knob 7 drives the screw 9 to rotate together. During the rotation, the screw 9 screws into the valve cavity 14 and pushes the valve stem 15, adjusting the position of the valve stem 15. When the valve stem 15 moves, the valve block 13 fixed to the valve stem 15 also moves, controlling the on / off of the first flow chamber 11 and the second flow chamber 12.
[0035] In a preferred embodiment, the threaded seat 8 is equipped with a plurality of fixing bolts 18. The fixing bolts 18 pass through the threaded seat 8 and are threadedly connected to bolt holes formed on the outside of the valve seat 6. By rotating and unscrewing the fixing bolts 18 from the bolt holes on the outside of the valve seat 6, the fixing between the threaded seat 8 and the valve seat 6 is released, making it easier for operators to inspect and repair the valve stem assembly.
[0036] In another preferred embodiment, a sealing rubber ring is fixedly connected to the side of the threaded seat 8 facing the valve seat 6, and the sealing rubber ring is in contact with the valve cavity 14. Since the threaded seat 8 is fixed to the valve seat 6 in a detachable installation manner, a sealing rubber ring is required to be added at the connection between the threaded seat 8 and the valve seat 6 to ensure the stability of the threaded seat 8 after installation.
[0037] In order to facilitate the user to rotate the screw 9, in a preferred embodiment, a plurality of strip-shaped ridges are provided on the outside of the knob 7, which are fixedly connected to the knob 7 and parallel to the axis of the knob 7. The strip-shaped ridges can increase friction and reduce the occurrence of hand slippage.
[0038] How this application works:
[0039] When collecting gas, pull the piston rod 2 downward, and the piston rod 2 will create a negative pressure in the gas cylinder 3. The valve stem assembly controls the first flow chamber 11 to open and the second flow chamber 12 to close. Under the action of negative pressure, the air in the sampling area is drawn into the gas cylinder 3 through the valve seat 6, the first flow chamber 11 and the air chamber 10. The valve stem assembly controls the first flow chamber 11 to close and the second flow chamber 12 to open, and pushes the piston rod 2 upward. The gas collected in the gas cylinder 3 will be discharged through the air chamber 10, the second flow chamber 12 and the gas outlet 4, completing the sampling. In a dim environment, the operator can judge whether the valve stem assembly has moved to the appropriate position by touching the first marking rod 16 and the second marking rod 17, which is more applicable.
[0040] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0041] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.
Claims
1. A coal mine negative pressure sampler, comprising an air cylinder (3), a valve seat (6) provided on the top of the air cylinder (3), and a piston rod (2) with a handle (1) provided on the bottom of the air cylinder (3), characterized in that: An air chamber (10), a first flow cavity (11) and a second flow cavity (12) are provided in the valve seat (6); A sampling head (5) is provided at the upper end of the valve seat (6), and an air outlet head (4) is provided on the side of the valve seat (6). The air outlet head (4) is communicated with the air chamber (10) through the second flow chamber (12). The valve seat (6) is communicated with the air chamber (10) through the first flow chamber (11). A valve stem assembly for controlling the opening and closing of the first flow chamber (11) and the second flow chamber (12) is slidably provided in the valve seat (6); A limiting hole is provided on the side of the air outlet head (4) away from the valve seat (6), and a first marking rod (16) is slidably provided in the limiting hole. One end of the first marking rod (16) is fixedly connected to the valve stem assembly, and the other end of the first marking rod (16) is fixedly connected to a second marking rod (17), and the second marking rod (17) is slidably connected to the limiting hole.
2. A coal mine negative pressure sampler according to claim 1, characterized in that: The valve stem assembly structure includes a valve stem (15) that passes through the valve seat (6), two valve blocks (13) are fixed on the outside of the valve stem (15), the valve block (13) is slidably connected to the valve cavity (14) opened in the valve seat (6), and the valve cavity (14) is connected to the air chamber (10), the first flow cavity (11) and the second flow cavity (12), one of the valve blocks (13) cooperates with the air inlet of the second flow cavity (12), and the other valve block (13) is staggered with the air outlet of the first flow cavity (11).
3. A coal mine negative pressure sampler according to claim 2, characterized in that: A screw adjustment assembly for pushing the valve stem (15) to move horizontally is provided on the side of the valve seat (6) away from the air outlet head (4), and the screw adjustment assembly is detachably connected to the valve seat (6).
4. A coal mine negative pressure sampler according to claim 3, characterized in that: The screw adjustment assembly includes a knob (7), a threaded seat (8) and a screw rod (9), wherein the threaded seat (8) is detachably connected to the outside of the valve seat (6), one end of the screw rod (9) penetrates into the valve cavity (14) and is rotatably connected to the valve stem (15), and the other end of the screw rod (9) is fixedly connected to the knob (7), the threaded seat (8) is sleeved on the outside of the screw rod (9), and the threaded seat (8) is threadably connected to the screw rod (9).
5. A coal mine negative pressure sampler according to claim 4, characterized in that: A plurality of fixing bolts (18) are mounted on the threaded seat (8), and the fixing bolts (18) pass through the threaded seat (8) and are threadedly connected to bolt holes opened on the outside of the valve seat (6).
6. A coal mine negative pressure sampler according to claim 4, characterized in that: A sealing rubber ring is fixedly connected to the threaded seat (8) on the side facing the valve seat (6), and the sealing rubber ring is in contact with the valve cavity (14).
7. A coal mine negative pressure sampler according to claim 4, characterized in that: A plurality of strip-shaped edges are provided on the outside of the knob (7), the strip-shaped edges are fixedly connected to the knob (7), and each of the strip-shaped edges is parallel to the axis of the knob (7).