A micro-impurity sampler for the inner wall of a steel bottle

Abstract

The present application belongs to the technical field of work cleaning process, and particularly relates to a steel bottle inner wall trace impurity sampler. The present application comprises an inner rod, an outer rod sleeved on the inner rod, a front movable support arranged on the inner end of the inner rod, a rear movable support arranged on the inner end of the outer rod, and a sampling head arranged on the outer end of the front movable support and the rear movable support. The position of the inner wall sampling head is adjusted by pushing and pulling the double rods of the inner and outer sleeves. When sampling, the radius of the sampling head is first reduced to smoothly pass through the narrow bottle mouth of the steel bottle and then increased to tightly adhere to the inner wall of the steel bottle for sampling. The present application has the following advantages. The front movable support and the rear movable support are made of elastic material, and the pressure of the sampling head when contacting the inner wall of the steel bottle is not large. When adjusting the relative position between the inner rod and the outer rod, the outer rod can be pushed in from the outer end by rotating the inner threaded ring, so that the direct movement of the outer rod is avoided to prevent the sampling head from moving too fast.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of work cleaning process, and particularly relates to a steel bottle inner wall trace impurity sampler. BACKGROUND

[0002] Steel gas cylinder is a disposable or refillable mobile pressure container with different pressure, volume, structure form and material for storing and transporting permanent gas, liquefied gas and dissolved gas. For example, in the semiconductor bulk gas demand, the purity of the gas required is very high, reaching more than 99.9999999% (9N) requirement, so the cleanliness of the inner wall of the steel cylinder for storing the gas is also very high. After cleaning, the smoothness of the gas cylinder needs to be tested, and the trace impurities in the inner wall of the gas cylinder need to be sampled. However, the steel cylinder for storing gas has the characteristics of narrow opening and wide interior, and the general sampling tool cannot well contact the inner wall of the steel cylinder, so a tool for conveniently sampling the inner wall of the steel cylinder is needed. SUMMARY

[0003] The present application aims to provide a steel bottle inner wall trace impurity sampler. The present application adjusts the position of the inner wall sampling head by the double rods of inner and outer sleeves through push-pull action. During sampling, the radius of the sampling head is first reduced to smoothly pass through the narrow bottle opening of the steel cylinder to enter its interior, and then the radius of the sampling head is increased to tightly adhere to the inner wall of the steel cylinder for sampling.

[0004] The technical scheme adopted by the present application to solve the above problems is: a steel bottle inner wall trace impurity sampler, comprising an inner rod, an outer rod sleeved on the inner rod, a front movable support provided on the inner end of the inner rod, a rear movable support provided on the inner end of the outer rod, and a sampling head provided on the outer end of the front and rear movable supports.

[0005] Further preferred technical scheme is that it further comprises a threaded column provided on the rear end of the inner rod, and an internal threaded ring screwed on the threaded column and used for jacking up the rear end of the outer rod.

[0006] Further preferred technical scheme is that the inner rod is provided with a limiting sliding groove; the hollow inner side of the outer rod is provided with a limiting sliding block installed in the limiting sliding groove.

[0007] Further preferred technical scheme is that the rear end of the outer rod is provided with an annular groove part, and the internal threaded ring is provided with a connecting rod part connected with the annular groove part.

[0008] Further preferably, the annular groove part comprises an annular groove and an annular connecting port in communication with the annular groove and used for mounting the connecting rod part; the connecting rod part comprises a connecting rod and a limiting block arranged at the outer end of the connecting rod and mounted in the annular groove; and the longest side length of the limiting block is greater than the width of the annular connecting port along the outer rod radial direction.

[0009] Further preferably, the connecting rod part further comprises a fixing groove arranged on the inner side surface of the annular connecting port and used for mounting the limiting block; and the width of the fixing groove along the outer rod radial direction is greater than the longest side length of the limiting block.

[0010] Further preferably, the inner threaded ring is provided with a cavity for mounting the connecting rod part; and the connecting rod part further comprises a rotating mechanism arranged in the cavity and used for rotating the connecting rod.

[0011] Further preferably, the rotating mechanism comprises a gear arranged on the inner side end of the connecting rod, a tooth column in meshing connection with the gear, and a pressing column arranged at the outer end of the tooth column and partially outside the cavity.

[0012] Further preferably, the rotating mechanism further comprises a return spring used for upwardly lifting the pressing column.

[0013] A steel bottle inner wall cleanliness detection method comprises the steel bottle inner wall trace impurity sampler.

[0014] The present application has the following advantages:

[0015] First, the front movable support and the rear movable support are prepared from a material with certain elastic performance, so that the pressure of the sampling head when contacting the steel bottle inner wall is not too large;

[0016] Second, when the relative position between the inner rod and the outer rod is regulated, the outer rod can be pushed inward from the outer end by rotating the inner threaded ring, so as to avoid the direct movement of the outer rod leading to the too fast movement speed of the sampling head;

[0017] Third, under the limiting action of the limiting sliding groove and the limiting sliding block, the outer rod cannot relatively rotate with the inner rod;

[0018] Fourth, the connecting rod part is arranged so that the inner threaded ring can directly drive the outer rod to displace relative to the inner rod. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic view of the sampler inserted into a steel bottle for sampling.

[0020] Figure 2Structure diagram of installing front and rear movable support for inner and outer rods.

[0021] Figure 3 For Figure 2 Diagram of adjusting relative position of inner and outer rods to expand the radius of the position where the sampling head is located.

[0022] Figure 4 Diagram of setting 4 sampling heads on the sampler.

[0023] Figure 5 Diagram of setting 6 sampling heads on the sampler.

[0024] Figure 6 Diagram of installing position of threaded column and internal threaded ring.

[0025] Figure 7 For Figure 6 Diagram of enlarged connection between threaded column and internal threaded ring in

[0026] Figure 8 For Figure 7 Diagram of enlarged connection between connecting rod part and annular groove part in

[0027] Figure 9 For Figure 8 Diagram of rotating connecting rod in

[0028] Figure 10 For Figure 9 Diagram of pushing outer rod forward in

[0029] Figure 11 For Figure 10 Diagram of rotating connecting rod to reset in

[0030] Figure 12 Structure diagram of outer rod.

[0031] Figure 13 For Figure 12 Diagram of cross section along the radial direction of outer rod.

[0032] Figure 14 For Figure 8 Structure diagram of

[0033] Figure 15 For Figure 9 Structure diagram of

[0034] Figure 16 For Figure 10 Structure diagram of

[0035] Figure 17 For Figure 11 Structure diagram of

[0036] Figure 18 For Figure 12 The schematic view of the plane of the middle cross-section annular groove part position.

[0037] Figure 19 The schematic view of the structure of the connecting rod part.

[0038] Figure 20 For Figure 19 The schematic view of rotating the connecting rod by pressing the pressing column.

[0039] In the drawings, the components represented by each reference numeral are as follows: inner rod 1, outer rod 2, front movable support 3, rear movable support 4, sampling head 5, threaded column 6, inner threaded ring 7, limiting sliding groove 101, limiting sliding block 201, annular groove part 202, annular groove part 202, connecting rod part 701, cavity 702, annular groove 202a, annular connecting port 202b, fixing groove 202c, connecting rod 701a, limiting block 701b, gear 701c, toothed column 701d, pressing column 701e, return spring 701f. DETAILED DESCRIPTION

[0040] The application will be further described in detail below in combination with the drawings.

[0041] The specific embodiments are only an explanation of the application, and are not a limitation of the application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the application.

[0042] Embodiment: A steel bottle inner wall trace impurity sampler, referring to Figure 1 , comprising an inner rod 1, an outer rod 2 sleeved on the inner rod 1, a front movable support 3 arranged on the inner end of the inner rod 1, a rear movable support 4 arranged on the inner end of the outer rod 2, and a sampling head 5 arranged on the outer end of the front movable support 3 and the rear movable support 4. During sampling, as shown in Figures 2-3As shown, the inner rod 1 is fixed first, and then the outer rod 2 is pulled outward, so that the front movable support 3 and the rear movable support 4 are tilted towards the inner and outer rods until the sampling head 5 can be directly inserted into the cylinder opening. Then the inner rod 1 is operated to send the sampling head 5 into the cylinder. When reaching the designated position, the inner rod 1 is fixed, and then the outer rod 2 is pushed inward, so that the front movable support 3 and the rear movable support 4 are tilted away from the inner and outer rods until the sampling head 5 contacts the inner wall of the cylinder. Then the inner rod 1 is moved forward and backward so that the sampling head 5 scrapes the inner wall of the cylinder to obtain the impurities possibly remaining in the inner wall. Finally, the sampling head 5 is taken out in the reverse direction to obtain the trace impurities possibly obtained thereon. The material of the sampling head 5 requires soft texture without damaging the inner wall of the cylinder and the ability to adsorb impurities. For example, the sampling head 5 can be a flocked swab. The inner rod 1 and the outer rod 2 are made of rigid materials, and the front movable support 3 and the rear movable support 4 are made of materials with certain elastic properties, so that the pressure of the sampling head 5 on the inner wall of the cylinder is not too large. When the pressure is too large, the front movable support 3 and the rear movable support 4 will bend to some extent to absorb part of the pressure of the sampling head 5 on the inner wall of the cylinder. Moreover, in the process of sending the sampling head 5 into the cylinder, the width of the unfolded front movable support 3 and the rear movable support 4 can be greater than the width of the cylinder opening. However, since the front movable support 3 and the rear movable support 4 have elastic properties, they can be easily inserted into the cylinder opening by slightly applying force, so that the applicability is wider and the cylinder cannot be used due to the too small cylinder opening.

[0043] Reference Figures 4-5 The sampling heads are generally symmetrically arranged so that the force is balanced during sampling. For example, the sampling head 5 can be arranged in four, with an angle of 90° between each sampling head 5, or the sampling head 5 can be arranged in six, with an angle of 60° between each sampling head 5.

[0044] In addition, when adjusting the relative position between the inner rod and the outer rod, directly pushing and pulling the outer rod 2 will make the front movable support 3 and the rear movable support 4 unfold too fast, and the sampling head 5 will also move too fast. However, the inside of the cylinder is invisible, and the impact force on the inner wall of the cylinder when the sampling head 5 contacts the inner wall will be too large if the sampling head 5 moves too fast. On the one hand, there is a risk that the sampling head 5 will directly damage the inner wall of the cylinder, and on the other hand, the front movable support 3 and the rear movable support 4 will be directly broken by the inner wall of the cylinder due to improper operation of the staff, and the broken support fragments will most likely scratch the inner wall of the cylinder. Since the inner wall of the cylinder for storing semiconductor gas is extremely smooth, such defects will make the cylinder unusable, causing huge losses. Therefore, in order to prevent the above situation from occurring, the sampler further comprises a threaded column 6 arranged at the rear end of the inner rod 1, and an inner threaded ring 7 screwed on the threaded column 6 and used to lift the rear end of the outer rod 2. Reference Figure 6, when regulating the relative position between the inner rod and the outer rod, as long as the inner threaded ring 7 is rotated, the outer rod 2 can be pushed in from the outer end, and the operation of rotating the inner threaded ring 7 pushes the outer rod 2 slowly, and the staff will not push the outer rod 2 too fast due to the operation, and when the force of rotating the inner threaded ring 7 becomes obviously larger, it can be known that the sampling head 5 has been pressed against the outer wall of the steel cylinder, at which time the rotation is stopped.

[0045] In order to prevent the outer rod 2 from rotating relative to the inner rod 1 during the position adjustment of the outer rod 2, causing the front movable support 3 and the rear movable support 4 to be twisted off, a limiting sliding groove 101 is arranged on the inner rod 1, and a limiting sliding block 201 is arranged on the hollow inner side of the outer rod 2 and installed in the limiting sliding groove 101. In this way, during the position adjustment of the outer rod 2, due to the limiting action of the limiting sliding block 201, the outer rod 2 can only move along the long slot direction of the limiting sliding groove 101, and the long slot direction of the limiting sliding groove 101 is parallel to the common axis of the inner and outer rods, so that the outer rod 2 cannot rotate relative to the inner rod 1.

[0046] In the above embodiment, the contact between the inner threaded ring 7 and the outer rod 2 is only by abutting, which has the disadvantage that after sampling is completed, the outer rod 2 needs to be pulled outwards, but this cannot be achieved by only reversing the rotation of the inner threaded ring 7, because the inner threaded ring 7 can only push the outer rod 2 to move inwards, but cannot drive it to move outwards, and still needs the staff to pull the outer rod 2 outwards after reversing the rotation of the inner threaded ring 7 to achieve this, which is a cumbersome operation step. Preferably, an annular groove portion 202 is arranged on the rear end of the outer rod 2, and a connecting rod portion 701 connected to the annular groove portion 202 is arranged on the inner threaded ring 7. Figure 12 The annular groove portion 202 is arranged at the rear end of the outer rod 2, and forms an annular groove with the common axis as the center. Figure 8 Figure 14 The connecting rod portion 701 is installed in the annular groove portion 202 and can rotate around the annular groove portion 202 along the common axis of the inner and outer rods, and the connecting rod portion 701 will not be separated from the annular groove portion 202 during rotation, so that the outer rod 2 can be moved relative to the inner rod 1 whether the inner threaded ring 7 is rotated forward or reversed.

[0047] <Specific structure of annular groove portion 202 and connecting rod portion 701>

[0048] ​The annular groove 202 comprises an annular groove 202a and an annular connecting port 202b in communication with the annular groove 202a and used for mounting the connecting rod part 701; the connecting rod part 701 comprises a connecting rod 701a and a limiting block 701b arranged at the outer end of the connecting rod 701a and mounted in the annular groove 202a; wherein the longest side length of the limiting block 701b is greater than the width of the annular connecting port 202b along the radial direction of the outer rod 2. Figure 8 、 18 -19, the connecting rod 701a passes through the annular connecting port 202b, and the limiting block 701b arranged at the inner end of the connecting rod 701a is mounted in the annular groove 202a, so that the connecting rod 701a cannot be separated from the annular connecting port 202b under the action of the limiting block 701b, and during the rotation of the connecting rod 701a, the outer rod 2 can be directly driven to displace relative to the inner rod 1 due to the action of the limiting block 701b.

[0049] In the above embodiment, the internal thread ring 7 is not fixed in the circumferential direction, which means that accidental rotation may occur during sampling, which may affect the sampling result, which is not desirable. Preferably, the connecting rod part 701 further comprises a fixing groove 202c arranged on the inner side of the annular connecting port 202b and used for mounting the limiting block 701b; the width of the fixing groove 202c along the radial direction of the outer rod 2 is greater than the longest side length of the limiting block 701b. Reference Figure 13 , the fixing groove 202c is independently arranged in the annular connecting port 202b

[0050] Therefore, when the internal thread ring 7 needs to be fixed, the limiting block 701b can be transferred from the annular groove 202a to the fixing groove 202c to achieve the fixation of the internal thread ring 7. The internal thread ring 7 is provided with a cavity 702 for mounting the connecting rod part 701; the connecting rod part 701 further comprises a rotating mechanism arranged in the cavity 702 and used for rotating the connecting rod 701a. In this way, the connecting rod 701a is rotatably connected to the internal thread ring 7. Reference Figures 8-11 and 14-17, during the transfer, the connecting rod 701a is first rotated by 90° to make the limiting block 701b horizontal, so that the shorter side of the limiting block 701b passes through the annular connecting port 202b, and when the limiting block 701b reaches the position of the fixing groove 202c, it is reversed by 90° to make the longer side of the limiting block 701b clamped in the fixing groove 202c. In this way, when the internal thread ring 7 needs to be rotated, the connecting rod 701a cannot be rotated along the annular connecting port 202b, and under the clamping action of the limiting sliding groove 101 and the limiting sliding block 201, the connecting rod 701a also cannot drive the outer rod 2 to rotate relative to the inner rod 1, thereby achieving the effect of fixing the internal thread ring 7 in the circumferential direction.

[0051] The advantage of the above design is that the worker needs to determine that the sampling head 5 is indeed tightly attached to the inner wall of the steel cylinder, and when the force resistance occurs when the internal thread ring 7 rotates, it means that the sampling head 5 is indeed attached to the inner wall of the steel cylinder, but it does not mean that all the sampling heads 5 are attached to the inner wall of the steel cylinder, because the sampling heads 5 cannot be arranged in a perfect circular array, so the worker needs to fine-tune the outer rod 2 into the steel cylinder at this time, so that all the sampling heads 5 are in contact with the inner wall of the steel cylinder, but it is difficult to control the distance of this fine-tuning. In combination with the adjustment mode of the above-mentioned limiting block 701b, when the limiting block 701b is transversely moved, it needs to be moved to the position where the fixed groove 202c is located, and the implementation is to slightly push the outer rod 2 inward. The fine-tuning of this slight pushing makes the sampling head 5 more tightly attached to the inner wall of the steel cylinder, and realizes the locking of the internal thread ring 7 plus the fine-tuning of the sampling head 5 tightly attached to the inner wall of the steel cylinder to facilitate sampling in one step. In fact, this scheme is to control the distance of fine-tuning the outer rod 2 by controlling the axial distance between the fixed groove 202c and the annular groove 202a during the preparation of the sampler, which is an extremely ingenious design.

[0052] <Rotation mechanism for realizing the rotation of the connecting rod 701a>

[0053] Reference Figures 19-20 The rotation mechanism includes a gear 701c arranged on the inner side end of the connecting rod 701a, a tooth column 701d engaged with the gear 701c, and a pressing column 701e arranged on the outer end of the tooth column 701d and partially outside the cavity 702. When rotating the connecting rod 701a, only the pressing column 701e needs to be pressed, and the gear 701c can be driven to rotate by 90° through the tooth column 701d, thereby driving the connecting rod 701a to rotate by 90°

[0054] Preferably, the rotation mechanism further includes a return spring 701f for upwardly lifting the pressing column 701e. After releasing the pressing column 701e, under the action of the return spring 701f, the tooth column 701d moves upwardly to drive the gear 701c to rotate reversely by 90°, thereby driving the connecting rod 701a to rotate reversely by 90°

[0055] In addition, the same or similar reference numerals are used in the drawings and the description to refer to the same or similar parts or steps as far as possible. The drawings are presented in a simplified form and are not drawn to scale. Directional terms such as top, bottom, left, right, upward, upward, upper, lower, lower, rear and front are used in the drawings for convenience and clarity. These and similar directional terms should not be interpreted as limiting the scope of the present disclosure in any way.

Claims

1. A sampler for trace impurities on the inner wall of a steel cylinder, characterized in that, The device includes an inner rod (1), an outer rod (2) sleeved on the inner rod (1), a front movable bracket (3) disposed on the inner end of the inner rod (1), a rear movable bracket (4) disposed on the inner end of the outer rod (2), and a sampling head (5) disposed on the outer ends of the front movable bracket (3) and the rear movable bracket (4); it also includes a threaded post (6) disposed at the rear end of the inner rod (1), and an internal threaded ring (7) screwed onto the threaded post (6) and used to lift the rear end of the outer rod (2); the inner rod (1) is provided with a limiting sliding groove (101); the hollow inner side of the outer rod (2) is provided with a limiting sliding block (201) installed in the limiting sliding groove (101); the rear end of the outer rod (2) is provided with an annular groove (202), and the internal threaded ring (7) is provided with a connecting rod (701) connecting the annular groove (202). The annular groove (202) includes an annular groove (202a) and an annular connecting port (202b) communicating with the annular groove (202a) and used for installing the connecting rod (701); the connecting rod (701) includes a connecting rod (701a) and a limiting block (701b) disposed at the outer end of the connecting rod (701a) and installed in the annular groove (202a); wherein the longest side of the limiting block (701b) is greater than the width of the annular connecting port (202b) along the radial direction of the outer rod (2); the connecting rod (701) also includes a fixing groove (202c) disposed on the inner side of the annular connecting port (202b) and used for installing the limiting block (701b); the width of the fixing groove (202c) along the radial direction of the outer rod (2) is greater than the longest side of the limiting block (701b).

2. The trace impurity sampler for the inner wall of a steel cylinder according to claim 1, characterized in that, The internal threaded ring (7) is provided with a cavity (702) for mounting the connecting rod portion (701); the connecting rod portion (701) also includes a rotating mechanism disposed in the cavity (702) for rotating the connecting rod (701a).

3. A trace impurity sampler for the inner wall of a steel cylinder according to claim 2, characterized in that, The rotating mechanism includes a gear (701c) disposed on the inner end of the connecting rod (701a), a toothed column (701d) meshing with the gear (701c), and a push post (701e) disposed on the outer end of the toothed column (701d) and partially outside the cavity (702).

4. A trace impurity sampler for the inner wall of a steel cylinder according to claim 3, characterized in that, The rotating mechanism also includes a return spring (701f) for lifting the push post (701e) upward.

5. A method for detecting the cleanliness of the inner wall of a steel cylinder, characterized in that, Use the cylinder inner wall trace impurity sampler as described in any one of claims 1-4.

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