Sampling head of dust sampler and use method

Abstract

The invention belongs to the field of environment and occupational health dust sampling, and relates to a dust sampler sampling head and a using method thereof, the dust sampler sampling head comprises a sampling head main shell, a filter membrane brake sealing ring, a filter membrane brake, a telescopic pressing sleeve, a spring, a sampling head air inlet end cover and other parts. Through a sliding mechanism of the telescopic pressing sleeve in the sampling head main shell, pressing sealing and quick dismounting of the filter membrane brake are realized; the operation convenience is remarkably improved, and the loss of dust in the dismounting process is reduced to the greatest extent, so that the sampling accuracy is improved; meanwhile, after the filter membrane is detached in the membrane replacement process, the telescopic pressing sleeve seals the filter membrane brake clamping groove of the sampling head main shell under the action of the spring, so that dust is prevented from falling into and damaging a sampling pump of the sampler. Besides, filter screens are ingeniously arranged on the filter membrane gate and the sampling head air inlet end cover, so that the impact of overlarge particles on the filter membrane is effectively prevented, the damage of the filter membrane is avoided, and the sampling stability and reliability are further improved.

Description

Technical Field

[0001] The invention belongs to the field of environmental and occupational health dust sampling, and relates to a sampling head of a dust sampler and a use method thereof. Background Art

[0002] Dust samplers are conventional instruments used to measure the concentration of suspended dust in ambient air. They are widely used in dust monitoring in industrial and mining enterprises, labor safety, labor hygiene and environmental protection departments. Traditional dust samplers usually include components such as suction pumps, flow regulation circuits, automatic feedback constant current circuits, and filter membranes for collecting dust samples. Researchers have also proposed a variety of solutions for dust samplers, such as a dust sampler with a convenient replacement filter membrane (CN202323326001.9), a dust sampler with a convenient replacement filter membrane (CN202210241406.3), a fixed sampling head for a filter membrane clamp, a dust sampler (CN201821978885.2), and a filter membrane clamp for a dust sampler (CN201320101155.5). Although these technologies and equipment can basically meet the needs of dust concentration monitoring, there are some shortcomings in actual operation. The main manifestations are: (1) The disassembly process is prone to shaking, which causes the dust on the sampling filter membrane to fall off, resulting in a decrease in the dust sampling volume and an increase in the dust sampling error; (2) During the on-site disassembly and replacement of the filter membrane, the dust in the dust-laden airflow will enter the sampler inlet with the wind flow, causing pollution; (3) The disassembly process is time-consuming and inefficient; (4) The filter membrane lacks protection and is prone to rupture, especially when there are large particles of dust or water mist. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a dust sampler sampling head and a method of use, by which the compression, sealing and disassembly of the membrane gate are realized through the sliding of a retractable compression sleeve in the main shell of the sampling head, which is convenient and quick and reduces dust loss; at the same time, by arranging a filter screen on the membrane gate and the air inlet end cover of the sampling head, effective protection of the filter membrane is achieved.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sampling head of a dust sampler is connected to the sampler, comprising a sampling head main shell, a retractable compression sleeve slidably arranged in the sampling head main shell, and a sampling head air inlet end cover connected to the retractable compression sleeve by screws, wherein the outer edge of the sampling head air inlet end cover is connected to the sampling head main shell by threads; a filter membrane gate placement groove is radially arranged in the sampling head main shell, a filter membrane gate A, a filter membrane and a filter membrane gate B are arranged in sequence in the filter membrane gate placement groove, and a filter screen is arranged in the filter membrane gate A.

[0005] Optionally, the main shell of the sampling head is in the shape of a cylindrical hollow tube, one end of which is connected to the sampler through a thread or a slot, and the other end is connected to the air inlet end cover of the sampling head; the main shell of the sampling head is also provided with sealing ring grooves for placing the first sealing ring and the second sealing ring on both sides of the filter membrane gate placement groove, and the first sealing ring and the second sealing ring cooperate to achieve sealing of the filter membrane gate A and the filter membrane gate B.

[0006] Optionally, the sampling head main housing is provided with two hollow grooves symmetrically in the radial direction on a side of the filter gate placement groove away from the sampler, and a lever handle connected to the retractable compression sleeve is detachably provided in the groove.

[0007] Optionally, membrane gate A and membrane gate B are respectively provided with female and male snap-ons for positioning; thin plate-like ears extend from the snap-ons for easy grasping and use; chamfers are provided on the opposite sides of the top of the two thin plate-like ears to facilitate disassembly of membrane gate A and membrane gate B after fastening.

[0008] Optionally, a filter gate mark is attached to the thin plate-shaped ear, and the filter gate mark is a number or a QR code or a bar code.

[0009] Optionally, the retractable compression sleeve is coaxially arranged with the main housing of the sampling head and is disposed inside the main housing of the sampling head. Two screw holes are symmetrically distributed along the radial direction near one end of the filter membrane gate B for installing the trigger handle.

[0010] Optionally, the central part of the retractable compression sleeve is an elastic structure, which is folded toward the inside of the axis in a relaxed state, and its telescopic length is greater than the thickness of the membrane gate A and the membrane gate B; a spring is coaxially arranged on the periphery of the elastic structure, and both ends of the spring are in contact with the end face of the retractable compression sleeve.

[0011] Optionally, the air inlet cover of the sampling head is provided with a filter to prevent overly large particles from hitting the filter membrane and causing damage to the filter membrane during sampling; the outer edge thereof is chamfered to prevent cutting hands.

[0012] The method for using the dust sampler sampling head is applicable to the dust sampler sampling head as described above, and comprises the following steps:

[0013] S1, before sampling, place the smooth surface of the filter membrane toward filter gate A and press it tightly with filter gate B. Repeat this step to prepare several filter gates;

[0014] S2, press the palm of your hand against the air inlet cover of the sampling head, hook your fingers on the lever handle on the retractable compression sleeve, pull it toward the palm of your hand to expose the filter gate slot, insert the structure assembled in step S1, and start sampling;

[0015] S3, after the sampling is completed, repeat step S2 and hook the handle to remove the filter gate;

[0016] S4, after releasing the hand, the retractable compression sleeve closes the filter gate slot under the pressure of the spring;

[0017] S5, repeat the above steps of inserting the filter gate to start the next sampling.

[0018] The beneficial effects of the present invention are: the overall structure of the present invention is compact, the installation and disassembly are convenient, and the filter membrane can be replaced quickly; after the filter membrane is removed, the filter membrane installation port will be automatically closed to prevent dust from falling in; compared with removing the filter membrane by rotation and other methods, the dust on the filter membrane can be prevented from being shaken off; the filter membrane gate and the air inlet end cover of the sampling head are provided with a mesh structure to prevent the filter membrane from being damaged.

[0019] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 It is the general assembly diagram of the internal structure of the sampling head of the present invention;

[0022] Figure 2 for Figure 1 Exploded diagram of

[0023] Figure 3 It is a stereoscopic diagram of the sampling head of the present invention;

[0024] Figure 4 It is a schematic diagram of the main housing of the sampling head of the present invention;

[0025] Figure 5 It is a schematic diagram of the connection between the sampling head and the sampler of the present invention;

[0026] Figure 6 A schematic diagram of a membrane gate A of the present invention;

[0027] Figure 7 It is a schematic diagram of the membrane gate B of the present invention;

[0028] Figure 8 It is an axonometric view of the retractable compression sleeve of the present invention;

[0029] Fig. 9 for Figure 8 A cross-sectional view of

[0030] Fig.10 It is a schematic diagram of the connection of the retractable compression sleeve of the present invention;

[0031] Fig.11 It is a schematic diagram of the air inlet end cover of the sampling head of the present invention;

[0032] Fig.12 This is a schematic diagram of the connection of the air inlet end cover of the sampling head of the present invention;

[0033] Fig.13 It is a schematic diagram of installing the filter membrane gate of the present invention;

[0034] Fig.14 It is a schematic diagram of taking out the filter membrane gate of the present invention.

[0035] Figure numerals: sampling head main housing 1, first sealing ring 2, filter membrane gate A3, filter membrane 4, filter membrane gate B5, second sealing ring 6, retractable compression sleeve 7, screw 8, sampling head air inlet end cover 9, spring 10, trigger handle 11. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] See also Figure 1 to Figure 14, is a sampling head for a dust sampler, connected to the sampler, comprising a sampling head main housing 1, a retractable compression sleeve 7 slidably arranged in the sampling head main housing 1, and a sampling head air inlet end cover 9 connected to the retractable compression sleeve 7 through a screw 8. The outer edge of the sampling head air inlet end cover 9 is connected to the sampling head main housing 1 through a thread. The sampling head main housing 1 is provided with a filter membrane gate placement groove in the radial direction, and a filter membrane gate A3, a filter membrane 4 and a filter membrane gate B5 are arranged in the filter membrane gate placement groove in sequence, and the filter membrane gate A3 is provided with a filter screen.

[0040] The sampling head main body 1 is in the shape of a cylindrical hollow tube, one end of which can be connected to the sampler through a thread or a slot, and the other end is connected to the sampling head air inlet end cover 9. The sampling head main body 1 is also provided with sealing ring grooves for placing the first sealing ring 2 and the second sealing ring 6 on both sides of the filter membrane gate placement groove, and the first sealing ring 2 and the second sealing ring 6 cooperate to achieve the sealing of the filter membrane gate A3 and the filter membrane gate B5.

[0041] The sampling head main housing 1 has two hollow grooves symmetrically formed in the radial direction on one side of the filter gate placement slot away from the sampler, and a lever handle 11 connected to the telescopic compression sleeve 7 is detachably provided in the hollow groove.

[0042] The membrane gate A3 and the membrane gate B5 are respectively provided with female and male bayonet for positioning. Thin plate-shaped ears extend from the bayonet for easy grasping and use. Chamfers are provided on the opposite sides of the tops of the two thin plate-shaped ears to facilitate the disassembly of the membrane gate A3 and the membrane gate B5 after being fastened. The membrane gate mark is affixed to the thin plate-shaped ears. The membrane gate mark is a number, a QR code or a barcode, etc., which is convenient for identifying and tracking the membrane gate and the filter membrane thereon.

[0043] The retractable compression sleeve 7 is coaxially arranged with the sampling head main housing 1 and is disposed inside the sampling head main housing 1. Two screw holes are symmetrically distributed along the radial direction near one end of the filter membrane gate B5 for installing the trigger handle 11. The central part of the retractable compression sleeve 7 is an elastic structure, which forms a folded shape toward the inside of the axis in a relaxed state, and its telescopic length is greater than the thickness of the filter membrane gate A3 and the filter membrane gate B5. A spring 10 is coaxially arranged on the periphery of the elastic structure, and both ends of the spring 10 are in contact with the end surface of the retractable compression sleeve 7.

[0044] The sampling head air inlet end cover 9 is provided with a filter screen to prevent oversized particles from hitting the filter membrane 4 during sampling and causing damage to the filter membrane 4. The outer edge of the sampling head air inlet end cover 9 is provided with a chamfer to prevent cutting hands.

[0045] The method for using the dust sampler sampling head is applicable to the above-mentioned dust sampler sampling head, and comprises the following steps:

[0046] S1, before sampling, place the smooth surface of the filter membrane 4 toward the filter membrane gate A3, and use the filter membrane gate B5 to press the filter membrane 4. Repeat this step to prepare several filter membrane gates for use;

[0047] S2, place your palm against the air inlet cover 9 of the sampling head, hook your fingers on the lever handle 11 on the retractable clamping sleeve 7, and pull it toward the palm to expose the filter membrane gate slot. At this time, due to the elastic structure of the retractable clamping sleeve 7 and the action of the spring 10, the retractable clamping sleeve 7 will fold inwardly of the axis, thereby exposing the filter membrane gate placement slot. Insert the membrane gate (i.e., the combination of membrane gate A3, filter membrane 4, and membrane gate B5) assembled in step S1 into the membrane gate placement slot, then release the lever handle 11, and the retractable clamping sleeve 7 will re-tighten the membrane gate under the pressure of the spring 10 to achieve sealing;

[0048] S3, sampling starts, the sampler inhales air through the connection between one end of the sampling head main housing 1 and the sampler, and the dust in the air is captured by the filter membrane 4;

[0049] S4, after the sampling is completed, repeat step S2, hook the handle 11 and take out the filter gate;

[0050] S5, after letting go, the retractable compression sleeve 7 recloses the filter gate slot under the pressure of the spring 10 to prevent dust from falling into the sampling head;

[0051] S6, the above steps S2 to S5 can be repeated, a new filter gate is inserted, and the next sampling is started.

[0052] The membrane filter gate of the present invention cooperates with the sampling head by inserting the card slot, and achieves sealing through a sealing ring; the membrane filter gate is compressed and loosened by sliding the lever handle 11 on the retractable clamping sleeve 7, which facilitates the installation and removal of the membrane filter gate; after removing the filter membrane, the retractable clamping sleeve closes the membrane filter gate card slot of the main housing of the sampling head under the action of the spring to prevent dust from falling in; a filter screen is set at the membrane filter gate and the air inlet end cover of the sampling head to protect the filter membrane.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. The dust sampler sampling head is connected to the sampler and is characterized by: It includes a sampling head main shell, a retractable compression sleeve slidably arranged in the sampling head main shell, and a sampling head air inlet end cover connected to the retractable compression sleeve through screws, and the outer edge of the sampling head air inlet end cover is connected to the sampling head main shell through threads; A filter gate placement groove is radially arranged on the main housing of the sampling head. A filter gate A, a filter membrane and a filter gate B are arranged in sequence in the filter gate placement groove. The filter gate A is provided with a filter screen.

2. The dust sampler sampling head according to claim 1, characterized in that: The main housing of the sampling head is in the shape of a cylindrical hollow tube, one end of which is connected to the sampler through a thread or a slot, and the other end is connected to the air inlet end cover of the sampling head; The main housing of the sampling head is also provided with sealing ring grooves for placing the first sealing ring and the second sealing ring on both sides of the filter membrane gate placement groove. The first sealing ring and the second sealing ring cooperate to achieve the sealing of the filter membrane gate A and the filter membrane gate B.

3. The dust sampler sampling head according to claim 2, characterized in that: The main housing of the sampling head is provided with two hollow grooves symmetrically in the radial direction on one side of the filter gate placement groove away from the sampler, and a wrench handle connected with the telescopic compression sleeve is detachably arranged in the groove.

4. The dust sampler sampling head according to claim 1, characterized in that: The membrane gate A and the membrane gate B are respectively provided with female and male snap-ons for positioning; thin plate-like ears extend from the snap-ons for easy grasping and use; chamfers are provided on the opposite sides of the top of the two thin plate-like ears for easy disassembly after the membrane gate A and the membrane gate B are fastened.

5. The dust sampler sampling head according to claim 1, characterized in that: A filter gate mark is attached to the thin plate-shaped ear, and the filter gate mark is a number or a QR code or a bar code.

6. The dust sampler sampling head according to claim 3, characterized in that: The retractable compression sleeve is coaxially arranged with the main housing of the sampling head and is disposed inside the main housing of the sampling head. Two screw holes are symmetrically distributed along the radial direction near one end of the filter membrane gate B for installing the trigger handle.

7. The dust sampler sampling head according to claim 1, characterized in that: The central part of the telescopic compression sleeve is an elastic structure, which forms a folded shape toward the inside of the axis in a relaxed state, and its telescopic length is greater than the thickness of the filter membrane gate A and the filter membrane gate B; A spring is coaxially arranged on the periphery of the elastic structure, and two ends of the spring are in contact with the end surface of the telescopic compression sleeve.

8. The dust sampler sampling head according to claim 1, characterized in that: The air inlet cover of the sampling head is equipped with a filter to prevent oversized particles from hitting the filter membrane and causing damage to the filter membrane during sampling; its outer edge is chamfered to prevent cutting hands.

9. A method for using a dust sampler sampling head, applicable to the dust sampler sampling head as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, before sampling, place the smooth surface of the filter membrane toward filter gate A and press it tightly with filter gate B. Repeat this step to prepare several filter gates; S2, press the palm of your hand against the air inlet cover of the sampling head, hook your fingers on the lever handle on the retractable compression sleeve, pull it toward the palm of your hand to expose the filter gate slot, insert the structure assembled in step S1, and start sampling; S3, after the sampling is completed, repeat step S2 and hook the handle to remove the filter gate; S4, after releasing the hand, the retractable compression sleeve closes the filter gate slot under the pressure of the spring; S5, repeat the above steps of inserting the filter gate to start the next sampling.

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