Sealing ring inner diameter detection device and inner diameter detection method thereof

Abstract

The invention discloses a sealing ring inner diameter detection device and an inner diameter detection method thereof.The sealing ring inner diameter detection device comprises an outer taper pipe and a guide pipe, the guide pipe and one end of the outer taper pipe can be connected in an inserted mode, the outer circumferential face of the guide pipe is movably sleeved with a push pipe, the outer taper pipe is a pipe with the diameter gradually changing from small to large, and when the guide pipe and the outer taper pipe are connected in an inserted mode, the push pipe is inserted into the guide pipe. The small-caliber end of the outer taper pipe is arranged in the push pipe, scales are arranged on one side of the outer taper pipe side by side, and the outer taper pipe is sleeved with a sealing ring. The device is simple in structure and convenient to operate, can quickly and accurately measure the inner diameter of the rotary Glyd ring, and can detect the roundness, elasticity, wear degree, hardness and other performances of the rotary Glyd ring at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing ring detection, in particular to a sealing ring inner diameter detection device and an inner diameter detection method thereof. Background Art

[0002] The rotating Glyd Ring is a sealing ring composed of a PTFE slip ring and an elastomer. It is widely used in mechanical devices in the medical, chemical, food and other fields. The rotating Glyd Ring is designed to adapt to the needs of high-speed and low-speed working conditions, and must ensure its low friction and strong sealing properties. The inner diameter of the rotating Glyd Ring directly affects its friction and sealing performance.

[0003] After user acceptance or a certain period of use, the user cannot directly determine whether the inner diameter of the rotating Glyer ring meets the use requirements. In the past, the inner diameter of the rotating Glyer ring was generally measured with a flexible ruler. However, since the material of the rotating Glyer ring is relatively soft, manual inspection cannot ensure that it is in an open circular shape, and deformation is likely to occur, which leads to inaccurate test results.

[0004] Therefore, it is necessary to provide a device and method for detecting the inner diameter of a rotating Glay ring, a detection tool that can measure accurately and ensure that it does not deform during detection. Summary of the Invention

[0005] The present invention provides a sealing ring inner diameter detection device to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A sealing ring inner diameter detection device includes an outer conical tube and a guide tube. The guide tube and one end of the outer conical tube can be plugged in. The outer peripheral surface of the guide tube is movably connected with a push tube. The outer conical tube is a tube with a gradually changing diameter from small to large. When the guide tube and the outer conical tube are plugged in, the small-diameter end of the outer conical tube is placed in the push tube. A ruler is provided side by side on one side of the outer conical tube, and a sealing ring is sleeved on the outer conical tube.

[0008] Preferably, a reading pointer is provided on the outer side of the lower portion of the push tube, and a counterweight groove is provided on the upper portion of the push tube, in which a counterweight ring is placed. The combined weight of the push tube and the counterweight ring is approximately 1 kg. This ensures that when the push tube contacts the sealing ring and presses downward, the inner ring surface of the sealing ring being measured can fully contact the outer cone tube, ensuring that the sealing ring is in a fully opened annular shape and improving measurement accuracy. The outer diameter of the outer cone tube matches the reading value on the scale. When testing sealing rings of different sizes, the corresponding outer cone tube and scale need to be replaced.

[0009] Preferably, the top of the outer conical tube is provided with an inner step, the bottom of the guide tube is provided with an outer step, and the inner step and the outer step are correspondingly plugged and connected. The length of the push tube is longer than the outer conical tube.

[0010] Preferably, a base is provided at the bottom of the ruler, and reading values are vertically provided on the ruler at the same intervals, and the reading values increase from top to bottom. The length of the reading value is the same as the length of the outer cone tube. For example: the rotating shaft diameter corresponding to a certain specification of the rotating grid ring is d, then the minimum diameter of the outer cone of the designed outer cone tube is d-1, and the maximum diameter is dmm. The change in the value marked by the reading value corresponds to the change in the diameter of the outer cone tube, that is, the value range of the reading value is 0.1mm-0.9mm. When testing the sealing ring, if the position pointed to by the reading pointer exceeds the marked range determined by the inner diameter tolerance of the rotating grid ring being tested, the inner diameter size of the sealing ring is unqualified, otherwise it is qualified.

[0011] Preferably, the sealing ring is a rotating Gly ring, and the scale is a transparent glass scale. The transparent glass scale is convenient for staff to observe.

[0012] A method for detecting the inner diameter of a rotating Glay ring based on the above-mentioned tool comprises the following steps:

[0013] S1 aligns the outer step at the bottom of the guide tube with the inner step at the top of the outer cone tube so that the inner step is aligned with the outer step;

[0014] S2 places the ruler on one side of the outer cone through the bottom base, and makes it on the same plane as the outer cone;

[0015] S3: The rotating Gly ring to be tested is mounted on the outer circumference of the outer cone tube;

[0016] S4 movably sleeves the push tube onto the outer circumference of the guide tube so that the bottom of the push tube contacts the upper surface of the rotating Gly ring;

[0017] Next, place a counterweight ring in the counterweight groove on the upper part of the push tube, and ensure that when the push tube is pressed down, the inner ring surface of the tested sealing ring can completely contact the outer cone tube, so that the sealing ring is in a fully opened ring shape;

[0018] S5 gently supports the push tube with your hand, allowing it to move downward naturally under the action of its own gravity and the counterweight ring, exerting downward pressure on the sealing ring. When the sealing ring stops moving downward, observe the reading value on the scale pointed by the reading pointer on the outer side of the lower part of the push tube to obtain the inner diameter value of the rotating Gly Ring.

[0019] Also includes the following:

[0020] According to the marked range of 0.1mm-0.9mm of the reading value on the ruler, determine whether the position pointed by the reading pointer is within the range determined by the inner diameter tolerance of the measured rotating Gley ring. If the position pointed by the reading pointer exceeds the marked range determined by the inner diameter tolerance of the measured rotating Gley ring, the inner diameter size of the rotating Gley ring is judged to be unqualified; otherwise, if it is within the marked range, the inner diameter size of the rotating Gley ring is judged to be qualified.

[0021] Also includes the following rotating Glay ring performance tests:

[0022] Sealing ring roundness: If the sealing ring has a roundness error (non-perfect circle), the reading pointer of the push tube may be "offset unstable" when it is fitted with the outer cone, such as the pointer edge is not completely aligned with the scale. By rotating the sealing ring to keep the outer cone stationary, read the pointer position multiple times. If the value fluctuates by more than 0.05mm, it can be judged that the roundness is unqualified;

[0023] Sealing ring elasticity: After the measurement is completed, remove the counterweight ring and the push tube, and observe the shrinkage speed of the sealing ring after it is removed from the outer cone tube: If the inner diameter after shrinkage deviates too much from the reading at the time of measurement, such as more than 0.1mm, it means that its elasticity is insufficient;

[0024] Degree of wear or deformation of the sealing ring surface: Measure the same sealing ring multiple times at intervals of time or number of uses. If the pointer reading gradually exceeds the qualified range, for example, from 0.5mm to 0.95mm, it means that the inner diameter of the sealing ring may have increased due to wear or permanent deformation, and its service life can be judged to be reduced;

[0025] The hardness of the sealing ring is indirectly reflected by replacing the counterweight rings with different weights, such as 0.8kg and 1.2kg, and comparing the changes in the pointer readings: If the weight change has too much influence on the reading, such as a 0.2kg difference causing the reading to fluctuate by more than 0.1mm, it means that the hardness of the sealing ring is too low and it is easy to deform under pressure; if the influence is too small, the hardness may be too high and it is easy to leak when sealing.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The device of the present invention places a ruler on one side of the outer cone tube, and the reading value marked on the ruler is the tolerance value corresponding to the change in the diameter of the outer cone tube. By sleeved on the guide tube, the push tube cooperates with the counterweight ring to press the sealing ring downward, and since the outer diameter of the outer cone tube gradually decreases from bottom to top, when the sealing ring stops moving downward, it is in the maximum open state of the sealing ring, avoiding its deformation. By reading the reading value on the corresponding ruler through the reading pointer, the inner diameter size of the tested sealing ring can be obtained, thereby realizing fast and accurate measurement of the inner diameter of the sealing ring. At the same time, the device can be used to detect and evaluate the performance of the sealing ring, such as roundness, elasticity, wear degree and hardness.

[0028] The inner diameter detection method of the rotating Glyer ring of the device can quickly and accurately obtain the inner diameter, and can simultaneously detect the roundness, elasticity, wear degree and hardness of the rotating Glyer ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a side cross-sectional schematic diagram of the overall structure of the present invention;

[0030] Figure 2 Schematic side cross-sectional view of the outer cone tube of the present invention;

[0031] Figure 3 is a schematic side cross-sectional view of the guide tube of the present invention;

[0032] Figure 4 It is a schematic side cross-sectional view of the push tube of the present invention;

[0033] Figure 5 This is a schematic diagram of the side structure of the scale of the present invention;

[0034] 1. Outer cone; 11. Inner step; 2. Sealing ring; 3. Guide tube; 31. Outer step; 4. Push tube; 41. Reading pointer; 42. Counterweight groove; 43. Counterweight ring; 5. Scale; 51. Base; 52. Reading value. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1

[0037] Reference Figure 1-5 A sealing ring inner diameter detection device includes an outer conical tube 1 and a guide tube 3. The guide tube 3 and outer conical tube 1 are pluggable at one end. A push tube 4 is movably connected to the outer circumference of the guide tube 3. The outer conical tube 1 is a tube with a gradually changing diameter from small to large. When the guide tube 3 and outer conical tube 1 are plugged together, the small-diameter end of the outer conical tube 1 is placed within the push tube 4. A scale 5 is provided side by side on one side of the outer conical tube 1. The outer conical tube 1 is fitted with a sealing ring 2. The push tube 4 is longer than the outer conical tube 1.

[0038] A reading pointer 41 is located on the lower exterior of the push tube 4. A counterweight groove 42 is located on the upper portion of the push tube 4, within which a counterweight ring 43 is placed. The combined weight of the push tube 4 and the counterweight ring 43 is approximately 1 kg. This ensures that when the push tube 4 contacts the sealing ring 2 and presses downward, the inner surface of the sealing ring 2 being measured fully contacts the outer cone 1, ensuring that the sealing ring 2 is in a fully open annular shape and improving measurement accuracy. The outer diameter of the outer cone 1 matches the reading 52 on the scale 5. When testing sealing rings 2 of different sizes, the corresponding outer cone 1 and scale 5 must be replaced.

[0039] An inner step 11 is provided at the top of the outer cone tube 1 , and an outer step 31 is provided at the bottom of the guide tube 3 . The inner step 11 and the outer step 31 are correspondingly plug-connected.

[0040] The base 51 is provided at the bottom of the ruler 5, and reading values 52 are vertically provided on the ruler 5 at the same intervals, and the reading values 52 increase from top to bottom. The length of the reading value 52 is the same as the length of the outer cone 1. For example: the rotating shaft diameter corresponding to a certain specification of the rotating Gray ring is d, then the minimum diameter of the designed outer cone 1 is d-1, and the maximum diameter is dmm. The change in the value marked by the reading value 52 corresponds to the change in the diameter of the outer cone 1, that is, the value range marked by the reading value 52 is 0.1mm-0.9mm. When testing the sealing ring 2, if the position pointed to by the reading pointer 41 exceeds the range marked by the reading value 52 determined by the inner diameter tolerance of the sealing ring 2, the inner diameter size of the sealing ring 2 is unqualified, otherwise it is qualified.

[0041] The sealing ring 2 is a rotating Gray ring, and the scale 5 is a transparent glass scale. The transparent glass scale is used to facilitate observation by staff.

[0042] When the present invention is used, the guide tube 3 is inserted into the top of the outer cone tube 1 through the docking of the inner step 11 and the outer step 31, and the scale 5 is placed on one side of the outer cone tube 1. The scale 5 and the outer cone tube 1 need to be in the same plane, and the sealing ring 2, that is, the rotating Gray ring is put on the outer circumference of the outer cone tube 1, and the push tube 4 is put on the guide tube 3. At the same time, the bottom of the push tube 4 contacts the sealing ring 2, and a counterweight ring 43 is placed on the counterweight groove 42, so that the push tube 4 applies downward pressure to the sealing ring 2. Since the outer diameter of the outer cone tube 1 gradually decreases from bottom to top, when the sealing ring 2 stops moving downward, the reading value 52 corresponding to the reading pointer 41 is read through the scale 5, and the reading value 52 can be used to determine whether the inner diameter of the tested sealing ring 2 is qualified.

[0043] The present invention has a simple structure and is easy to operate, and can measure the inner diameter of the sealing ring 2 quickly and accurately.

[0044] Example 2

[0045] A method for detecting the inner diameter of a rotating Glay ring based on the above-mentioned tool comprises the following steps:

[0046] S1 connects the guide tube and the outer cone tube, aligning the outer step 31 at the bottom of the guide tube 3 with the inner step 11 at the top of the outer cone tube 1, and inserting them firmly so that the inner step 11 and the outer step 31 are tightly connected to each other, ensuring that the guide tube 3 and the outer cone tube 1 are firmly connected without looseness or shaking;

[0047] S2: Place the ruler: Place the ruler 5 on one side of the outer cone 1 through the bottom base 51, and adjust the position of the ruler 5 so that it is in the same plane as the outer cone 1, so as to accurately observe the corresponding relationship between the reading pointer 41 and the reading value 52 later;

[0048] S3 carefully puts the sealing ring 2 (rotating Gly ring) to be tested on the outer circumference of the outer cone tube 1, ensuring that the sealing ring 2 is completely inserted into the outer cone tube 1 and is positioned correctly without any skew or distortion, so that the sealing ring 2 is in a natural state;

[0049] S4: Push tube 4 is slidably mounted on the outer circumference of guide tube 3, so that the bottom of push tube 4 contacts the upper surface of sealing ring 2. Next, a counterweight ring 43 is placed in the counterweight groove 42 on the upper portion of push tube 4, ensuring that the counterweight ring 43 is positioned stably. The total weight of push tube 4 and counterweight ring 43 is approximately 1 kg. This ensures that when push tube 4 is subsequently pressed downward, the inner surface of sealing ring 2 under test can fully contact outer cone 1, keeping sealing ring 2 in a fully expanded annular shape.

[0050] S5 gently supports the push tube 4, allowing it to naturally move downward under the action of gravity and the counterweight ring 43, exerting downward pressure on the sealing ring 2. Because the outer cone 1 has a gradually increasing diameter, as the push tube 4 is pressed downward, the sealing ring 2 will gradually move downward along the outer circumference of the outer cone 1. When the sealing ring 2 stops moving downward, maintain the current state and observe the reading pointer 41 on the lower outer side of the push tube 4 pointing to the reading value 52 on the scale 5;

[0051] S6 reads the reading value 52 on the scale 5 pointed by the reading pointer 41, ensuring that the line of sight is perpendicular to the scale 5 when reading to avoid visual errors. The read value is accurately recorded.

[0052] Based on the range (0.1mm-0.9mm) of the reading value 52 on the scale 5, it is determined whether the position pointed by the reading pointer 41 is within the range determined by the inner diameter tolerance of the sealing ring 2. If the position pointed by the reading pointer 41 exceeds the range marked by the reading value 52 determined by the inner diameter tolerance of the sealing ring 2, the inner diameter of the sealing ring 2 is determined to be unqualified; otherwise, if it is within the marked range, the inner diameter of the sealing ring 2 is determined to be qualified.

[0053] In addition, before testing, select the outer cone tube 1 and scale 5 that match the size of the sealing ring 2 to be tested, ensuring that the outer diameter of the outer cone tube 1 matches the reading value 52 on the scale 5. Carefully inspect the inner step 11 of the outer cone tube 1 and the outer step 31 of the guide tube 3 to confirm that they are free of wear, deformation, or other damage, ensuring that they can be smoothly plugged in. Check that the reading pointer 41 on the lower outer side of the push tube 4 is clear and firm, that the upper counterweight groove 42 is clean and free of debris, and that the counterweight ring 43 is complete and the weight meets the requirements (the push tube 4 and the counterweight ring 43 together are approximately 1 kg). At the same time, check whether the base 51 at the bottom of the scale 5 is intact, whether the scale 5 is made of transparent glass, whether the reading values 52 set vertically at the same intervals are clearly visible, and whether the length of the reading value 52 is the same as the length of the corresponding outer cone 1. For example: the rotating shaft diameter corresponding to a certain specification of the rotating grid ring is d, then the minimum diameter of the designed outer cone 1 is d-1, the maximum diameter is dmm, and the reading value 52 is marked in the range of 0.1mm-0.9mm.

[0054] When it is necessary to test sealing rings 2 of different sizes, the outer cone tube 1, ruler 5, push tube 4, counterweight ring 43 and sealing ring 2 currently in use must be disassembled first. According to the pre-test preparation steps, the outer cone tube 1 and ruler 5 that match the size of the new sealing ring are selected, and the above test steps are repeated for testing.

[0055] In addition to the above tests, the following rotating Glay ring performance tests can be performed:

[0056] Sealing ring roundness: If the sealing ring has roundness error (non-perfect circle), the push tube reading pointer may be "offset unstable" (e.g., the pointer edge is not completely aligned with the scale) when it is fitted to the outer cone. By rotating the sealing ring (keeping the outer cone stationary), read the pointer position multiple times. If the value fluctuates by more than 0.05mm, it can be judged that the roundness is unqualified.

[0057] Sealing ring elasticity (recovery performance): After the measurement is completed, remove the counterweight ring and the push tube, and observe the shrinkage speed of the sealing ring after it is removed from the outer cone tube: If the inner diameter after shrinkage deviates too much from the reading during measurement (such as more than 0.1mm), it means that its elasticity is insufficient (which may affect the sealing effect).

[0058] Surface wear or deformation of the sealing ring: Measure the same sealing ring multiple times (at certain intervals or times of use). If the pointer reading gradually exceeds the qualified range (for example, from 0.5mm to 0.95mm), it means that the inner diameter of the inner ring of the sealing ring may have increased due to wear or permanent deformation, and its service life can be judged to be reduced.

[0059] Sealing ring hardness (indirect reflection): Replace the counterweight rings with different weights (such as 0.8kg and 1.2kg) and compare the changes in the pointer readings: If the weight change has too much impact on the reading (such as a 0.2kg difference causes the reading to fluctuate by more than 0.1mm), it means that the sealing ring hardness is too low (easy to deform under pressure); if the impact is too small, the hardness may be too high (easy to leak when sealing).

[0060] The detection tool has a reasonable structural design and can quickly and accurately measure the inner diameter of the sealing ring. It can also be used to detect and evaluate the roundness, elasticity, wear degree and hardness of the sealing ring.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0062] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A sealing ring inner diameter detection device, characterized in that: The invention comprises an outer conical tube (1) and a guide tube (3), wherein one end of the guide tube (3) and the outer conical tube (1) can be plugged in, and a push tube (4) is movably sleeved on the outer peripheral surface of the guide tube (3). The outer conical tube (1) is a tube with a diameter gradually changing from small to large. When the guide tube (3) and the outer conical tube (1) are plugged in, the small-diameter end of the outer conical tube (1) is placed in the push tube (4). A scale (5) is arranged side by side on one side of the outer conical tube (1), and a sealing ring (2) is sleeved on the outer conical tube (1).

2. The sealing ring inner diameter detection device according to claim 1, characterized in that: A reading pointer (41) is provided on the outer side of the lower portion of the push tube (4), a counterweight groove (42) is provided on the upper portion of the push tube (4), and a counterweight ring (43) is placed in the counterweight groove (42).

3. The sealing ring inner diameter detection device according to claim 1, characterized in that: The top of the outer cone tube (1) is provided with an inner step (11), and the bottom of the guide tube (3) is provided with an outer step (31), and the inner step (11) and the outer step (31) are correspondingly plug-connected.

4. The sealing ring inner diameter detection device according to claim 1, characterized in that: A base (51) is provided at the bottom of the ruler (5), and reading values (52) are vertically provided on the ruler (5) at the same intervals, and the reading values (52) increase in sequence from top to bottom.

5. The sealing ring inner diameter detection device according to claim 1, characterized in that: The sealing ring (2) is a rotating Gray ring, and the scale (5) is a transparent glass scale.

6. A method for detecting the inner diameter of a rotating Glay ring based on the sealing ring inner diameter detection device according to any one of claims 1 to 5, characterized in that , including the following: A method for detecting the inner diameter of a rotating Glay ring based on the above-mentioned tool comprises the following steps: S1 aligns the outer step at the bottom of the guide tube with the inner step at the top of the outer cone tube so that the inner step is aligned with the outer step; S2 places the ruler on one side of the outer cone through the bottom base, and makes it on the same plane as the outer cone; S3: The rotating Gly ring to be tested is mounted on the outer circumference of the outer cone tube; S4 movably sleeves the push tube onto the outer circumference of the guide tube so that the bottom of the push tube contacts the upper surface of the rotating Gly ring; Next, place a counterweight ring in the counterweight groove on the upper part of the push tube, and ensure that when the push tube is pressed down, the inner ring surface of the tested sealing ring can completely contact the outer cone tube, so that the sealing ring is in a fully opened ring shape; S5 gently supports the push tube with your hand, allowing it to move downward naturally under the action of its own gravity and the counterweight ring, exerting downward pressure on the sealing ring. When the sealing ring stops moving downward, observe the reading value on the scale pointed by the reading pointer on the outer side of the lower part of the push tube to obtain the inner diameter value of the rotating Gly Ring.

7. The method for detecting the inner diameter of a rotating Glay ring based on the sealing ring inner diameter detection device according to claim 6, characterized in that: Also includes the following: According to the marked range of 0.1mm-0.9mm of the reading value on the ruler, determine whether the position pointed by the reading pointer is within the range. If the position pointed by the reading pointer exceeds the marked range determined by the inner diameter tolerance of the measured rotating Glay ring, the inner diameter size of the rotating Glay ring is judged to be unqualified; otherwise, if it is within the marked range, the inner diameter size of the rotating Glay ring is judged to be qualified.

8. The method for detecting the inner diameter of a rotating Glay ring based on the sealing ring inner diameter detection device according to claim 6, characterized in that: Also includes the following rotating Glay ring performance tests: Sealing ring roundness: If the sealing ring has a roundness error (non-perfect circle), the reading pointer of the push tube may be "offset unstable" when it is fitted with the outer cone, such as the pointer edge is not completely aligned with the scale. By rotating the sealing ring to keep the outer cone stationary, read the pointer position multiple times. If the value fluctuates by more than 0.05mm, it can be judged that the roundness is unqualified; Sealing ring elasticity: After the measurement is completed, remove the counterweight ring and the push tube, and observe the shrinkage speed of the sealing ring after it is removed from the outer cone tube: If the inner diameter after shrinkage deviates too much from the reading at the time of measurement, such as more than 0.1mm, it means that its elasticity is insufficient; Degree of wear or deformation of the sealing ring surface: Measure the same sealing ring multiple times at intervals of time or number of uses. If the pointer reading gradually exceeds the qualified range, for example, from 0.5mm to 0.95mm, it means that the inner diameter of the sealing ring may have increased due to wear or permanent deformation, and its service life can be judged to be reduced; The hardness of the sealing ring is indirectly reflected by replacing the counterweight rings with different weights, such as 0.8kg and 1.2kg, and comparing the changes in the pointer readings: If the weight change has too much influence on the reading, such as a 0.2kg difference causing the reading to fluctuate by more than 0.1mm, it means that the hardness of the sealing ring is too low and it is easy to deform under pressure; if the influence is too small, the hardness may be too high and it is easy to leak when sealing.

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