Trace powder sampler

Abstract

The invention relates to the technical field of trace powder sampling, and discloses a trace powder sampler which comprises a fixed handle, an adjusting handle and a sampling spoon, the adjusting handle is of a rod-shaped structure, the fixed handle is of a hollow rod-shaped structure with two open ends, and the adjusting handle extends into the fixed handle and is in threaded connection with the fixed handle; the sampling spoon comprises a connector and a spoon head, one end of the connector is connected with the spoon head, the other end of the connector is connected with a fixed handle, an adjusting handle penetrates through the connector and extends into the spoon head, the adjusting handle makes contact with the inner wall of the spoon head, a push cylinder is slidably installed on the fixed handle, the push cylinder is provided with a first receding groove for the spoon head to penetrate through, and the spoon head is provided with a sampling cavity. The opening edge of the sampling cavity makes contact with the inner wall of the first receding groove of the push cylinder, and the end, located in the spoon head, of the adjusting handle abuts against the inner wall face of one end of the push cylinder. The micro-powder sampling device can further improve the micro-powder sampling precision and convenience.

Description

Technical Field

[0001] The present application relates to the technical field of trace powder sampling, and in particular to a trace powder sampler. Background Art

[0002] In order to extract 20 mg ± 5 mg of powdered material in the glove box and to allow continuous sampling, the sampled powder is poured into a precision balance for measurement, and the entire process is carried out in the glove box.

[0003] At present, the trace powder sampler is as described in the utility model of application number CN201520379757.6, comprising a cylindrical outer shell, the inner cavity of the outer shell is divided into adjacent main cavity and secondary cavity, an adjusting nut is fixed on the upper part of the main cavity, an adjusting screw engaged with the adjusting nut is also passed through the upper part of the main cavity, a connecting cylinder is arranged at the end of the adjusting screw, an adjusting rod is passed through the lower part of the main cavity, a fixed sampling cylinder threadedly connected to the outer shell is arranged outside the adjusting rod, the head of the adjusting rod is inserted into the connecting cylinder and moves up and down relative to the fixed sampling cylinder with the spiral movement of the adjusting screw, a movable sampling cylinder is arranged outside the fixed sampling cylinder, a sampling pressure rod buckled with the movable sampling cylinder is passed through the secondary cavity, a sampling head is arranged at the end of the adjusting rod, and the adjusting rod, the sampling head, the fixed sampling cylinder and the movable sampling cylinder form a sampling cavity.

[0004] With respect to the above-mentioned related technologies, when the sampler samples powder, the powder filling degree in the sampling cavity needs to be improved during the sliding process of the movable sampling tube, which also leads to a large error in the volume of the powder taken out. Summary of the invention

[0005] In order to further improve the sampling accuracy of trace powders, the present application provides a trace powder sampler.

[0006] The present application provides a trace powder sampler, which adopts the following technical solution: A trace powder sampler comprises a fixed handle, an adjustment handle and a sampling spoon, the adjustment handle is a rod-shaped structure, the fixed handle is a hollow rod-shaped structure with openings at both ends, the adjustment handle extends into the fixed handle and is threadedly connected to the fixed handle, the sampling spoon comprises a connecting head and a spoon head, one end of the connecting head is connected to the spoon head, and the other end of the connecting head is connected to the fixed handle, the adjustment handle passes through the connecting head and extends into the spoon head, the adjustment handle contacts the inner wall of the spoon head, the fixed handle is slidably mounted with a push cylinder, the push cylinder is provided with a first give way groove for the spoon head to pass through, the spoon head has a sampling cavity, the opening edge of the sampling cavity contacts the inner wall of the first give way groove of the push cylinder, and the end of the adjustment handle located in the spoon head abuts against the inner wall surface of one end of the push cylinder.

[0007] By adopting the above technical solution, the trace powder sampler realizes the adjustability of the sampling cavity volume of the sampling spoon by adjusting the threaded connection of the handle in the fixed handle. The push cylinder slides on the fixed handle, and the first clearance groove allows the spoon head to pass through. The edge of the sampling cavity opening of the spoon head contacts the inner wall of the first clearance groove of the push cylinder. The powder overflowing from the sampling spoon can be pushed out. Sampling can be done with one hand and the powder in the sampling spoon can be flattened with one hand, thereby further improving the accuracy and convenience of trace powder sampling.

[0008] Optionally, the sampler further comprises a fixing assembly, wherein the fixing assembly comprises a resistance ring, wherein the resistance ring is sleeved on the adjusting handle, and an outer ring wall of the resistance ring contacts an inner wall of a tail portion of the fixing handle.

[0009] By adopting the above technical solution, the resistance ring is sleeved on the adjusting handle and contacts the inner wall of the rear end of the fixed handle, thereby increasing the resistance of the adjusting handle when rotating and preventing it from accidentally loosening.

[0010] Optionally, the fixing assembly further includes a connecting ring, and the connecting ring is threadedly connected to the outer wall of the rear end of the fixing handle.

[0011] By adopting the above technical solution, the connecting ring and the fixed handle are detachably connected. When the connecting ring is screwed into the fixed handle, the connecting ring further squeezes the resistance ring, further increasing the resistance of the adjusting handle when rotating. Optionally, the connector has a receiving cavity, and a sealing ring is installed in the connector in the receiving cavity, and the sealing ring is in sealing contact with the outer peripheral side of the adjustment handle.

[0012] By adopting the above technical solution, the sealing ring is installed in the accommodating cavity of the connecting head and is in sealing contact with the outer peripheral side of the adjusting handle to prevent powder from entering the interior of the fixed handle.

[0013] Optionally, a convex ring is fixedly connected to the outer wall of the fixed handle, and the outer wall of the fixed handle is sleeved on a first return spring, one end of the first return spring abuts against the convex ring, and the other end of the first return spring abuts against an end of the push tube away from the sampling spoon.

[0014] By adopting the above technical solution, after the push cylinder pushes away too much powder, the push cylinder can automatically reset, which is convenient for the next sampling operation and improves the sampling efficiency.

[0015] Optionally, the push cylinder includes a first cylinder body and a second cylinder body, and the first cylinder body is sleeved in the second cylinder body and is connected by threads.

[0016] By adopting the above technical solution, the push cylinder is formed by the first cylinder body and the second cylinder body being connected by threads, which facilitates the removal of the push cylinder from the fixed handle. The length of the push cylinder can also be adjusted as needed to adjust the elastic force of the first return spring.

[0017] Optionally, the sampler further includes an auxiliary push assembly, which includes a push rod, one end of which passes through the first cylinder and is located at the spoon head, and the other end of the push rod is coaxially plugged with the adjustment handle, and the push rod moves with the rotation of the adjustment handle.

[0018] By adopting the above technical solution, the auxiliary push assembly includes a push rod, which is located in the spoon head and plugged into the adjustment handle. When the adjustment handle is rotated, the push rod moves along with the rotation of the adjustment handle. The push rod can scrape the powder in the sampling cavity. When the adjustment handle moves away from the spoon head, the push cylinder can push the push rod, and the push rod always remains plugged into the adjustment handle.

[0019] Optionally, the auxiliary thrust assembly also includes a linkage rod and a mounting ring, the mounting ring being coaxially sleeved on the outer wall of the first cylinder, the mounting ring being rotatably connected to the second cylinder, the linkage rod being inserted into the first cylinder, and a clearance space being left between the mounting ring and the first cylinder, a second return spring being installed in the first cylinder to drive the linkage rod to always have a tendency to insert into the clearance space, one end of the linkage rod located in the clearance space having a slope, a push block being installed in the mounting ring, and when the second cylinder and the first cylinder are threadedly connected, the push block and the slope are in sliding contact, and the push rod is provided with a socket for the linkage rod to be inserted.

[0020] By adopting the above technical solution, the auxiliary push assembly composed of the linkage rod and the mounting ring and other components, through the elastic force of the second return spring, makes the linkage rod always have the tendency to be inserted into the clearance space. The second cylinder is threadedly connected to the first cylinder. When the second cylinder is rotated, when the second cylinder rotates close to the mounting ring, the first cylinder will not rotate because it cooperates with the spoon head. The push block and the inclined surface are in sliding contact, pushing the linkage rod to insert into the insertion hole of the push rod. The first cylinder and the push rod form a connection relationship. Pushing the push cylinder can take the push rod away from the adjustment handle. The push rod can scrape the powder in the sampling cavity. The push rod can also be re-inserted along with the push cylinder and the adjustment handle.

[0021] Optionally, a connecting ring is fixedly connected to the end of the second cylinder, and the connecting ring is rotatably connected to the mounting ring.

[0022] Optionally, the connecting ring is detachably connected to a travel block, and the mounting ring is provided with a travel groove for the travel block to slide.

[0023] By adopting the above technical solution, the travel block can be detachably connected to the connecting ring, and the mounting ring is provided with a travel groove for the travel block to slide, which limits the rotation angle and travel of the second cylinder, thereby further limiting the sliding travel of the push block.

[0024] In summary, the present application includes at least one of the following beneficial effects: 1. Through the precise matching of the handle, push tube and spoon head, as well as the application of sealing measures such as sealing rings, accurate sampling and leakage prevention of trace powders are achieved, which improves the accuracy and safety of sampling; 2. When the sampling spoon pours powder, the push rod can move back and forth with the push tube. The push rod can scrape the powder from the sampling cavity, reduce the occurrence of powder residue in the sampling cavity, and improve the accuracy of subsequent powder collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 is a cross-sectional view of the overall structure of Example 1 of the present application; Figure 3 is a partial structural cross-sectional view of Example 1 of the present application; Figure 4 is a cross-sectional view of the overall structure of Example 2 of the present application; Figure 5 This is a schematic diagram of the structure of the embodiment 2 of the present application, which embodies the installation of a mounting ring and a linkage rod; Figure 6 yes Figure 5 A magnified schematic diagram of point A; Figure 7 It is a schematic diagram of the overall structure of the first cylinder of Examples 1 and 2 of the present application.

[0026] Description of reference numerals: 100, fixed handle; 110, convex ring; 200, adjustment handle; 210, non-slip handle; 300, sampling spoon; 310, spoon head; 311, sampling cavity; 320, connecting head; 321, accommodating cavity; 322, sealing ring; 400, push cylinder; 410, first clearance groove; 420, second clearance groove; 430, first cylinder; 431, large outer diameter section; 432, small outer diameter section; 433, clearance surface; 434, Make room; 440, second cylinder; 441, connecting ring; 442, travel block; 500, first return spring; 600, fixing assembly; 610, resistance ring; 620, connecting ring; 700, auxiliary push assembly; 710, push rod; 711, socket; 720, linkage rod; 721, limit block; 722, inclined surface; 730, mounting ring; 732, push block; 733, travel groove; 734, blocking block; 800, second return spring. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-7 This application is described in further detail.

[0028] Example 1 Example 1 of the present application discloses a trace powder sampler. Figure 1 and Figure 2 A trace powder sampler includes a fixed handle 100, an adjustment handle 200 and a sampling spoon 300. The adjustment handle 200 and the fixed handle 100 are both rod-shaped structures. The fixed handle 100 is specifically a hollow rod-shaped structure with two ends opened. The adjustment handle 200 is inserted into the fixed handle 100 and is threadedly connected to the fixed handle 100. The sampling spoon 300 includes a spoon head 310 and a connector 320. The spoon head 310 and the connector 320 are integrally formed. One end of the connector 320 is inserted into the fixed handle 100 and is threadedly connected to the fixed handle 100. The spoon head 310 is a semi-cylindrical structure. The spoon head 310 has a sampling cavity 311. The sampling cavity 311 is a semi-circular arc groove structure. The adjustment handle 200 passes through the connector 320 and penetrates into the sampling cavity 311. The adjustment handle 200 is divided into sections with different outer diameters. The end of the adjustment handle 200 with a smaller outer diameter is located inside the spoon head 310. The outer diameter of the section of the adjustment handle 200 extending into the sampling cavity 311 is the same as the inner diameter of the sampling cavity 311. The adjustment handle 200 can be rotated to change the volume of the sampling cavity 311.

[0029] Reference Figure 3 When the sampling spoon 300 digs out excess powder, in order to push away the excess powder, the fixed cylinder is slidably connected with a push cylinder 400, and the two end surfaces of the push cylinder 400 are respectively provided with a first clearance groove 410 and a second clearance groove 420, the first clearance groove 410 is in the shape of a semicircular hole, the second clearance groove 420 is in the shape of a circular hole, and the fixed handle 100 passes through the second clearance groove 420. The spoon head 310 extends out of the push cylinder 400 through the first clearance groove 410, the edge of the opening of the sampling cavity 311 fits with the inner wall of the first clearance groove 410, and the push cylinder 400 is slid, and the push cylinder 400 can flatten the powder so that the powder only exists in the sampling cavity 311. The end of the adjustment handle 200 contacts the push cylinder 400, and when the adjustment handle 200 rotates, the push cylinder 400 changes position with the movement of the adjustment handle 200.

[0030] Reference Figure 3 The outer wall of the fixed handle 100 near the spoon head 310 is fixedly connected with a convex ring 110, and a gap is left between the inner wall of the push cylinder 400 and the outer wall of the fixed handle 100. The outer wall of the fixed handle 100 is sleeved on the first return spring 500, one end of the first return spring 500 abuts against the convex ring 110, and the other end of the first return spring 500 abuts against the step of the push cylinder 400 away from the sampling spoon 300. After pushing the push cylinder 400 to flatten the powder, release the push cylinder 400, and the first return spring 500 drives the push cylinder 400 to slide and return, saving manpower.

[0031] Furthermore, the push cylinder 400 includes a first cylinder body 430 and a second cylinder body 440, the first clearance groove 410 is located on the first cylinder body 430, the second clearance groove 420 is located on the second cylinder body 440, the first cylinder body 430 is inserted into the second cylinder body 440 and is connected by threads, the first cylinder body 430 cannot be rotated because it cooperates with the spoon head 310, and only the second cylinder body 440 can be rotated. Rotating the second cylinder body 440 separates the first cylinder body 430 and the second cylinder body 440, and the first cylinder body 430 and the second cylinder body 440 leave the fixed handle 100 respectively. The design of the first cylinder body 430 and the second cylinder body 440 allows the push cylinder 400 to be detachably mounted on the fixed handle 100.

[0032] The connector 320 is a variable diameter cylindrical structure, and has a receiving cavity 321 therein. A sealing ring 322 is installed in the receiving cavity 321 of the connector 320 . When the adjustment handle 200 rotates, the inner wall surface of the sealing ring 322 is in sealing contact with the outer wall of the adjustment handle 200 .

[0033] Reference Figure 3 There are three sealing rings 322, two of which are made of plastic material, and the other sealing ring 322 is made of rubber material. The cross section of the sealing ring 322 made of plastic material is rectangular, and the sealing ring 322 made of plastic material increases the surface area of ​​the adjustment surface. The cross section of the sealing ring 322 made of rubber material is circular, and the sealing ring 322 made of rubber material is located between the two plastic sealing rings 322. The three sealing rings 322 enhance the sealing between the connecting head 320 and the adjusting handle 200, so that the powder in the spoon head 310 cannot enter the fixed handle 100.

[0034] Reference Figure 2 The sampler also includes a fixing assembly 600, which includes a resistance ring 610. The resistance ring 610 is made of damping material and is sleeved on the outer wall of the adjusting handle 200. A threaded portion is provided at a portion of the adjusting handle 200 with a larger outer diameter and is threadedly connected to the tail of the fixed handle 100. The resistance ring 610 is also sleeved on the portion of the adjusting handle 200 with a larger outer diameter. The resistance ring 610 contacts the inner side wall of the tail of the fixed handle 100. The resistance ring 610 not only increases the friction between the fixed handle 100 and the adjusting handle 200, greatly reducing the accidental rotation of the adjusting handle 200, but also blocks the tail of the fixed handle 100.

[0035] Reference Figure 2 The fixing assembly 600 also includes a connecting ring 620, which is threadedly connected to the outer wall of the fixing handle 100. When the connecting ring 620 and the fixing handle 100 are threadedly connected, an extrusion force is exerted on the resistance ring 610, so that the resistance ring 610 is more closely attached to the adjustment handle 200, thereby preventing the adjustment handle 200 from rotating accidentally.

[0036] Reference Figure 1 and Figure 2 The end of the adjusting handle 200 away from the sampling spoon 300 is fixedly connected with an anti-skid handle 210, which is sleeved on the adjusting handle 200 and then threadedly connected with the adjusting handle 200 through a bolt. The anti-skid handle 210 can better apply force to the adjusting handle 200.

[0037] The implementation principle of a trace powder sampler in Example 1 of the present application is: The sampler is used in a glove box. The volume of powder to be sampled is calculated. The adjusting handle 200 is turned with both hands to adjust the volume of the sampling cavity 311 of the sampling spoon 300. The sampler is taken with one hand to take samples. When the powder in the sampling spoon 300 is full, the push cylinder 400 is pushed with one hand. The push cylinder 400 will automatically reset after scraping the powder. The powder volume of the sampling spoon 300 is determined, and the powder is poured into the balance to complete a sampling. When the powder sampling volume is the same, there is no need to repeatedly adjust the adjusting handle 200. Continuous sampling can be performed with one hand, making the entire sampling process convenient and accurate.

[0038] Example 2 The difference between Example 2 and Example 1 is that the sampler further includes an auxiliary thrust assembly 700, and the rest of the structure and principle are basically the same as those of Example 1.

[0039] Reference Figure 4 The auxiliary push assembly 700 includes a push rod 710, one end of which is located in the spoon head 310, and the other end of the push rod 710 is plugged into the adjustment handle 200 and is coaxially rotatably connected with the adjustment handle 200. The section where the push rod 710 is connected to the adjustment handle 200 is cylindrical, and the section where the push rod 710 is located in the spoon head 310 is semi-cylindrical. The push rod 710 moves with the rotation of the adjustment handle 200, thereby changing the sampling volume of the sampling spoon 300. The first cylinder 430 is in contact with the semi-cylindrical part of the push rod 710, and the inner wall surface of the first cylinder 430 is in contact with the end surface of the cylindrical part of the push rod 710. Therefore, when the adjustment handle 200 moves in the direction away from the spoon head 310, the push cylinder 400 is acted upon by the elastic force of the first return spring 500, and the push cylinder 400 moves in the direction away from the spoon head 310. The push cylinder 400 also pushes the push rod 710, so that the push rod 710 maintains a plug-in relationship with the adjustment handle 200.

[0040] When the sampling spoon 300 pours powder, the adjustment handle 200 can be turned, and the push rod 710 pushes all the powder away from the sampling spoon 300. However, the adjustment handle 200 and the push rod 710 must return to their original positions so that the sampling spoon 300 can continue to sample. In order to return the push rod 710 to the specified position, the sampling spoon 300 can be made of transparent plastic material, and the outer wall of the sampling spoon 300 is also engraved with scales to facilitate the push rod 710 to serve as a reference.

[0041] Further, refer to Figure 5 and Figure 6 In order to enable the push rod 710 to be pushed with one hand, the auxiliary push assembly 700 also includes a linkage rod 720 and a mounting ring 730. The linkage rod 720 is inserted into the first cylinder 430. The length direction of the linkage rod 720 is the same as the radial direction of the first cylinder 430. The mounting ring 730 is sleeved on the outer wall of the first cylinder 430.

[0042] Reference Figure 7 The first cylinder 430 of the first and second embodiments includes a large outer diameter section 431 and a small outer diameter section 432, which are integrally formed. The small outer diameter section 432 is threadedly connected to the second cylinder 440, and the mounting ring 730 is sleeved on the large outer diameter section 431. The outer wall of the large outer diameter section 431 of the first cylinder 430 is provided with a clearance surface 433.

[0043] Reference Figure 6 When the mounting ring 730 of the second embodiment is mounted on the large outer diameter section 431, a clearance space 434 is left between the mounting ring 730 and the clearance surface 433 of the first cylinder 430. A second return spring 800 is installed in the first cylinder 430 to drive the linkage rod 720 to always have a tendency to insert into the clearance space 434. The outer wall of the connecting rod is fixedly connected to the limit block 721. The second return spring 800 abuts against the first cylinder 430, and the other end of the second return spring 800 abuts against the limit block 721. One end of the linkage rod 720 located in the clearance space 434 has an inclined surface 722. A push block 732 is installed in the mounting ring 730. The push block 732 and the clearance surface 433 are in sliding contact. When the push block 732 slides along the inclined surface 722, the linkage rod 720 overcomes the elastic force of the second return spring 800 and moves toward the push rod 710. The push rod 710 is provided with a socket 711 for the linkage rod 720 to be plugged in. When the first cylinder 430 is connected to the push rod 710 through the linkage rod 720 , the push rod 710 can be driven to move in the sampling spoon 300 by sliding the push cylinder 400 .

[0044] Reference Figure 6In order to allow the mounting ring 730 to slide and stop at any time, a spacing is left between the second cylinder 440 and the mounting ring 730, and the mounting ring 730 is rotatably connected to the second cylinder 440. A connecting ring 441 is fixedly connected to the end of the second cylinder 440, and the mounting ring 730 is provided with a ring groove for inserting the connecting ring 441. Because the first cylinder 430 is always kept stationary in cooperation with the spoon head 310, when the second cylinder 440 rotates, the connecting ring 441 and the mounting ring 730 are rotatably connected, and the connecting ring 441 can be rotatably connected to the mounting ring 730 through a bearing. However, in order to reduce the wall thickness of the mounting ring 730, the connecting ring 441 is detachably connected with a travel block 442, and the travel block 442 and the connecting ring 441 are in a plug-in relationship. A travel groove 733 is provided on the inner wall of the mounting ring 730 for the travel block 442 to slide, and the travel groove 733 runs through the outer wall of the mounting ring 730. When the second cylinder 440 is rotated, the connecting ring 441 moves with the travel block 442 in the travel groove 733. The travel groove 733 is a circular arc groove. The arc length of the circular arc groove limits the rotation range of the connecting ring 441, and further limits the range of back and forth movement of the mounting ring 730. When the push cylinder 400 needs to be removed from the fixed handle 100, the travel block 442 needs to be pulled out first, so that the mounting ring 730 is separated from the push cylinder 400 first.

[0045] The mounting ring 730 is plugged with a blocking block 734 of an arc structure, and the blocking block 734 blocks the travel groove 733, so that a complete annular surface is formed outside the mounting ring 730. The blocking block 734 can protrude from the mounting ring 730, so that the blocking block 734 is easy to remove.

[0046] The implementation principle of a trace powder sampler in Example 2 of the present application is: When used in a glove box, calculate the volume of powder to be sampled, turn the adjustment handle 200, and the push rod 710 moves in the sampling cavity 311 along with the rotation of the adjustment handle 200 to determine the volume of the sampling cavity 311 of the sampling spoon 300. Take the sampler with one hand to sample. When the powder in the sampling spoon 300 is full, push the push cylinder 400 with one hand. The push cylinder 400 will automatically reset after scraping the powder flat. Before pouring the powder into the balance, first turn the second cylinder 440 with one hand to insert the linkage rod 720 into the push rod 710, and the powder will be poured out. During the process of entering the balance, the push cylinder 400 is pushed with one hand, and the push cylinder 400 moves with the push rod 710 in the sampling chamber 311. The push rod 710 can scrape the powder in the sampling chamber 311. When the push cylinder 400 is reset, the push rod 710 is also reset. It is only necessary to slightly rotate the second push cylinder 400 to make the linkage rod 720 leave the push rod 710, and the push cylinder 400 can resume the function of only flattening the powder. The entire sampling process can be operated with one hand, and the action of the push rod 710 pushing the powder further improves the sampling accuracy.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A trace powder sampler, characterized in that: The invention comprises a fixed handle (100), an adjustable handle (200) and a sampling spoon (300), wherein the adjustable handle (200) is a rod-shaped structure, the fixed handle (100) is a hollow rod-shaped structure with openings at both ends, the adjustable handle (200) extends into the fixed handle (100) and is threadedly connected to the fixed handle (100), the sampling spoon (300) comprises a connector (320) and a spoon head (310), one end of the connector (320) is connected to the spoon head (310), the other end of the connector (320) is connected to the fixed handle (100), and the adjustable handle (200) extends through the fixed handle (100). The connecting head (320) extends into the spoon head (310), the adjusting handle (200) contacts the inner wall of the spoon head (310), the fixed handle (100) is slidably mounted with a push cylinder (400), the push cylinder (400) is provided with a first clearance groove (410) for the spoon head (310) to pass through, the spoon head (310) has a sampling cavity (311), the opening edge of the sampling cavity (311) contacts the inner wall of the first clearance groove (410) of the push cylinder (400), and the end of the adjusting handle (200) located in the spoon head (310) abuts against the inner wall surface of one end of the push cylinder (400).

2. A trace powder sampler according to claim 1, characterized in that: The sampler further comprises a fixing assembly (600), wherein the fixing assembly (600) comprises a resistance ring (610), wherein the resistance ring (610) is sleeved on the adjustment handle (200), and an outer ring wall of the resistance ring (610) contacts an inner wall of the rear end of the fixing handle (100).

3. A trace powder sampler according to claim 2, characterized in that: The fixing assembly (600) further comprises a connecting ring (620), wherein the connecting ring (620) is threadedly connected to the outer wall of the rear end of the fixing handle (100).

4. A trace powder sampler according to claim 1, characterized in that: The connecting head (320) has a receiving cavity (321), and a sealing ring (322) is installed in the connecting head (320) in the receiving cavity (321), and the sealing ring (322) is in sealing contact with the outer peripheral side of the adjusting handle (200).

5. A trace powder sampler according to claim 1, characterized in that: A convex ring (110) is fixedly connected to the outer wall of the fixed handle (100), and the outer wall of the fixed handle (100) is sleeved on the first return spring (500), one end of the first return spring (500) abuts against the convex ring (110), and the other end of the first return spring (500) abuts against an end of the push cylinder (400) away from the sampling spoon (300).

6. A trace powder sampler according to claim 5, characterized in that: The push cylinder (400) comprises a first cylinder body (430) and a second cylinder body (440); the first cylinder body (430) is sleeved in the second cylinder body (440) and is connected via threads.

7. A trace powder sampler according to claim 6, characterized in that: The sampler further comprises an auxiliary push assembly (700), wherein the auxiliary push assembly (700) comprises a push rod (710), one end of the push rod (710) passes through the first cylinder (430) and is located on the spoon head (310), and the other end of the push rod (710) is coaxially plugged with the adjustment handle (200), and the push rod (710) moves along with the rotation of the adjustment handle (200).

8. A trace powder sampler according to claim 7, characterized in that: The auxiliary thrust assembly (700) further comprises a linkage rod (720) and a mounting ring (730), wherein the mounting ring (730) is coaxially sleeved on the outer wall of the first cylinder (430), the linkage rod (720) is inserted into the first cylinder (430), a clearance space (434) is left between the mounting ring (730) and the first cylinder (430), and a driving member (430) is installed in the first cylinder (430) to drive the linkage rod (720) to always have the insertion clearance space (434). ) is provided with a second return spring (800) which is inclined in the inner part of the cylinder (440), one end of the linkage rod (720) located in the clearance space (434) has an inclined surface (722), a push block (732) is installed in the mounting ring (730), when the second cylinder (440) and the first cylinder (430) are threadedly connected, the push block (732) and the inclined surface (722) are in sliding contact, and the push rod (710) is provided with a socket (711) for the linkage rod (720) to be plugged in.

9. A trace powder sampler according to claim 8, characterized in that: A connecting ring (441) is fixedly connected to the end of the second cylinder (440), and the connecting ring (441) and the mounting ring (730) are rotatably connected.

10. A trace powder sampler according to claim 9, characterized in that: The connecting ring (441) is detachably connected to a travel block (442), and the mounting ring (730) is provided with a travel groove (733) for the travel block (442) to slide.

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