Liquid specific gravity measuring device

Abstract

The present invention relates to a liquid specific gravity measuring device, which comprises: a measuring cylinder; a first end cover and a second end cover, which are respectively covered at the two ends of the measuring cylinder; a sheath, which is inserted in the first end cover, and the sheath can selectively have its top end or bottom end fixed in the first end cover, and a receiving cavity is arranged in the middle of the sheath; a fixed block, which is inserted in the top end of the sheath and can move up and down; a hydrometer, the top of which can be stuck in the fixed block; when the top end of the sheath is fixed in the first end cover and the hydrometer is inserted in the receiving cavity and its top is stuck in the fixed block, the fixed block is at the low point of the moving stroke, and when the fixed block moves upward from the low point, the hydrometer will not move under the restriction of the receiving cavity, and the fixed block will be separated from the hydrometer. In the present invention, the hydrometer is put into the measuring cylinder in advance, so when measuring the specific gravity value, it is not necessary to open the end cover to put in the hydrometer, so it can avoid the situation that the liquid to be measured evaporates and affects the measuring personnel and the surrounding environment.

Description

Technical Field

[0001] The invention relates to the field of measuring instruments, and in particular to a liquid specific gravity measuring device. Background Art

[0002] In the chemical industry, it is often necessary to measure the specific gravity of a liquid. The current measurement method is to add a certain amount of the liquid to be tested to a measuring cylinder, and then put a hydrometer in the measuring cylinder to observe the specific gravity value. However, if the measured liquid is volatile and has the characteristics of toxicity, corrosiveness or irritation, the liquid will evaporate from the measuring cylinder, affecting the operator and the surrounding environment. For example, in the production process of hydrochloric acid prepared by absorbing hydrogen chloride gas with water, it is usually necessary to detect the absorption concentration. The commonly used method is sampling detection, that is, a certain amount of the liquid to be tested is collected with a measuring cylinder, and then a hydrometer is placed in the measuring cylinder to observe the specific gravity value, and then the specific gravity value is converted into a percentage concentration. However, since the sampled liquid to be tested is concentrated hydrochloric acid, which is volatile, corrosive and has a pungent odor, when measuring the specific gravity value, hydrochloric acid will evaporate from the measuring cylinder, affecting the physical and mental health of the measuring personnel and the surrounding environment.

[0003] In this regard, it is necessary to improve the existing specific gravity measuring device and provide a specific gravity measuring device suitable for volatile liquids to avoid the occurrence of the above situation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a specific gravity value measuring device suitable for volatile liquids, so as to avoid the influence of the volatilization of the liquid on the measuring personnel and the surrounding environment when measuring the specific gravity value.

[0005] In order to solve the above problems, the present invention provides a liquid specific gravity measuring device, which includes a measuring cylinder, a first end cover, a second end cover, a sheath, a fixing block and a specific gravity meter;

[0006] Both ends of the measuring cylinder are open;

[0007] The first end cover is detachably mounted on one end of the measuring cylinder; and the first end cover is provided with an axially penetrating through hole;

[0008] The second end cover is detachably mounted on the other end of the measuring cylinder;

[0009] The sheath is inserted into the through hole of the first end cover, and the two ends of the sheath are respectively a first end and a second end. The sheath can selectively fix the first end in the through hole or the second end in the through hole, and the fixing method is detachable. When the first end of the sheath is fixed in the through hole, the second end of the sheath is located in the inner cavity of the measuring cylinder, and when the second end of the sheath is fixed in the through hole, the first end of the sheath is located outside the measuring cylinder; at the same time, a receiving cavity for accommodating the hydrometer is provided in the middle of the sheath, and the cavity shape of the receiving cavity matches the outer contour of the hydrometer;

[0010] The fixing block is inserted into the first end of the sheath and cannot be separated from the first end, and the fixing block can move relative to the sheath within a limited range along the axial direction of the sheath; a slot hole is provided inside the fixing block to accommodate the upper end of the hydrometer to be inserted therein, and a first slot is provided in the slot hole;

[0011] The upper end of the hydrometer is provided with a first clamping ring matching the first clamping groove;

[0012] When the hydrometer is inserted into the accommodating cavity of the sheath and the first clamping ring is clamped in the first clamping groove, at this time, the fixing block is at the side close to the second end of the sheath in the moving stroke; when the fixing block moves from the side close to the second end to the side away from the second end, under the restriction of the accommodating cavity, the hydrometer cannot move with the fixing block, and the first clamping groove will be separated from the first clamping ring;

[0013] When the hydrometer is fully inserted into the accommodating cavity, there is a small gap between the inner wall of the accommodating cavity and the outer wall of the hydrometer; when the upper end of the hydrometer is inserted into the slot, there is a gap between the inner wall of the slot and the outer wall of the hydrometer;

[0014] Wherein, a sinking hole is provided on the end face of the first end of the sleeve, and the sinking hole includes a neck hole located on the upper side and a limiting hole located on the lower side, wherein the neck hole and the limiting hole are connected to each other and the aperture of the neck hole is smaller than the aperture of the limiting hole; a convex column is formed on the lower part of the fixed block, and the convex column includes a neck and a limiting portion, wherein the neck is inserted into the neck hole and can move freely along the axial direction of the neck hole, the limiting portion is located in the limiting hole and the diameter of the limiting portion is larger than the aperture of the neck hole and smaller than the aperture of the limiting hole, and the limiting portion can move back and forth in the limiting hole along the axial direction of the limiting hole but cannot be moved out of the limiting hole, so as to realize the movement of the fixed block relative to the sleeve within a limited range.

[0015] Furthermore, a first sealing ring is arranged in the neck hole to seal the gap between the neck hole and the neck.

[0016] Furthermore, a second sealing ring is provided in the through hole of the first end cover to seal the gap between the through hole and the sheath.

[0017] Furthermore, a second card slot is provided on the upper side of the through hole, and a third card slot is provided on the lower side of the through hole;

[0018] The outer wall of the first end of the sheath is provided with a second clamping ring matching the second clamping groove, and the outer wall of the second end of the sheath is provided with a third clamping ring matching the third clamping groove.

[0019] Furthermore, a filter screen is provided on one side of the measuring cylinder close to the second end cover, and the four sides of the filter screen are fixed to the inner wall of the measuring cylinder.

[0020] The beneficial effects of the present invention are as follows: after the liquid to be measured is loaded into the measuring cylinder, when measuring the specific gravity value, the first end cover does not need to be opened, and the fixing block is lifted upward to first disengage the first clamping ring of the fixing block from the first clamping ring of the hydrometer, so that the hydrometer loses its fixation and slides down from the accommodating cavity to float in the liquid to be measured, and then the fixing block is continuously lifted upward to drive the sheath to move upward to disengage the second clamping ring from the second clamping groove, and then the third clamping ring is clamped into the third clamping groove, so that the sheath is completely separated from the hydrometer and will no longer contact the hydrometer, so that the specific gravity value can be measured. The hydrometer will float stably in the liquid to be tested and will not come into contact with other objects, so the specific gravity of the liquid can be determined by observing the value on the scale paper of the hydrometer corresponding to the liquid surface to be tested, and then the density and concentration of the liquid can be obtained; it can be seen that during the entire measurement process, since the hydrometer is placed in the measuring cylinder in advance, the first end cover does not need to be opened during measurement, and therefore the measuring cylinder is always closed during the measurement process, and the liquid to be tested will not evaporate, so the evaporation of the liquid to be tested can be avoided to affect the physical and mental health of the measuring personnel and the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural state diagram of Example 1 before use;

[0022] Figure 2 yes Figure 1 Enlarged view within the middle dashed line range;

[0023] Figure 3 This is a schematic diagram of Example 1 when measuring specific gravity value, the second end cover is removed and the measuring cylinder is inverted and loaded with the liquid to be measured;

[0024] Figure 4 is Figure 3 A schematic diagram of the measuring cylinder being turned back after the second end cover is closed on the basis of FIG.

[0025] Figure 5 is Figure 4Schematic diagram of lifting the fixed block upwards to separate it from the hydrometer;

[0026] Figure 6 is Figure 5 A schematic diagram of a case where the fixing block is further lifted upwards to drive the sheath to move upwards to the highest point;

[0027] Figure 7 The structure of the second end cover in Example 2 is shown. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and therefore the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0030] Embodiment 1:

[0031] See also Figure 1 and Figure 2 This embodiment provides a liquid specific gravity measuring device, which includes a measuring cylinder 1, a first end cover 2, a second end cover 3, a sheath 4, a fixing block 5 and a specific gravity meter 6.

[0032] The top and bottom of the measuring cylinder 1 are both open.

[0033] The first end cap 2 is threadedly connected to cover the top of the measuring cylinder 1. The first end cap 2 is provided with a first sealing gasket 23. When the first end cap 2 is screwed on the top of the measuring cylinder 1, the first sealing gasket 23 can prevent the liquid in the measuring cylinder 1 from leaking out from the gap between the first end cap 2 and the measuring cylinder 1. In addition, an axial through hole 21 is provided in the middle of the first end cap 2.

[0034] The second end cap 3 is threadedly connected to cover the bottom of the measuring cylinder 1. The second end cap 3 is provided with a second sealing gasket 31. When the second end cap 3 is screwed onto the bottom of the measuring cylinder 1, the second sealing gasket 31 can prevent the liquid in the measuring cylinder 1 from leaking out from the gap between the second end cap 3 and the measuring cylinder 1.

[0035] The sheath 4 is inserted into the through hole 21 of the first end cover 2. The outer diameter of the sheath 4 is slightly smaller than the inner diameter of the through hole 21. The two ends of the sheath 4 are respectively a first end 41 and a second end 42. The sheath 4 can selectively fix the first end 41 in the through hole 21 or fix the second end 42 in the through hole 21, and the fixing method is detachable. When the first end 41 of the sheath 4 is fixed in the through hole 21, the second end 42 of the sheath 4 is located in the inner cavity of the measuring cylinder 1 (see Figure 1 ), when the second end 42 of the sheath 4 is fixed in the through hole 21, the first end 41 of the sheath 4 is located outside the measuring cylinder 1 (see Figure 6 ). At the same time, a receiving cavity 43 for receiving the hydrometer 6 is provided in the middle of the sheath 4. The shape of the receiving cavity 43 matches the outer contour of the hydrometer 6. The receiving cavity 43 can cover the lower half of the hydrometer 6, but cannot completely wrap the hydrometer 6 therein, and the size of the receiving cavity 43 is slightly about the size of the hydrometer 6, that is, when the hydrometer 6 is fully inserted into the receiving cavity 43, there is a small gap between the inner wall of the receiving cavity 43 and the outer wall of the hydrometer 6. Once the hydrometer 6 loses its fixation, the hydrometer 6 will slide out of the receiving cavity 43 under the action of gravity.

[0036] The fixing block 5 is inserted into the first end 41 of the sheath 4 and cannot be separated from the first end 41, and the fixing block 5 can move relative to the sheath 4 within a limited range along the axial direction of the sheath 4. The fixing block 5 is provided with a slot 51 for accommodating the upper end of the hydrometer 6 to be inserted therein, and a first annular slot 511 is provided in the slot 51. At the same time, when the upper end of the hydrometer 6 is inserted into the slot 51, there is a gap between the inner wall of the slot 51 and the outer wall of the hydrometer 6, so when the hydrometer 6 is not fixed, the hydrometer 6 will slide out of the slot 51 under the action of gravity.

[0037] The hydrometer 6 is basically consistent with the common hydrometer 6 on the market, except that the hydrometer 6 of this embodiment is provided with a first clamping ring 61 at its upper end to match the first clamping groove 511. The hydrometer 6 is a sealed glass tube, the upper part of which is uniform in thickness and provided with a scale paper inside, and the lower part is slightly expanded to be a bubble-like body, and the bubble-like body is filled with small lead particles or mercury, so that the glass tube can be vertically immersed in the liquid to be tested to a sufficient depth and stably float in the liquid to be tested. When the hydrometer 6 stably floats in the liquid, the buoyancy it receives is equal to its own gravity. Therefore, according to the Archimedean principle, when the density of the liquid is greater, the depth of the hydrometer 6 immersed in the liquid is smaller, and vice versa, the depth of immersion is greater. Therefore, when the hydrometer 6 floats in the liquid, the density of the liquid can be judged according to the immersion depth, that is, the density of the liquid (or the specific gravity value, concentration of the liquid) can be judged according to the value of the liquid surface corresponding to the scale paper.

[0038] The accommodating cavity 43 can not only wrap the upper part of the hydrometer 6 therein, but also wrap at least a part of the bubble-like body of the lower part of the hydrometer 6 therein, see Figure 1 .

[0039] When the hydrometer 6 is inserted into the accommodating cavity 43 of the sheath 4 and the first clamping ring 61 is clamped in the first clamping groove 511, at this time, the fixing block 5 is at a side close to the second end 42 of the sheath 4 in the moving stroke, that is, at this time, the fixing block 5 is at a low point and can move upward relative to the sinking hole 44, see Figure 1 and Figure 2 When the fixing block 5 moves from the side close to the second end 42 to the side away from the second end 42, since the shape of the accommodating cavity 43 matches the outer contour of the hydrometer 6, and the hydrometer 6 is a structure with a small top and a large bottom, the hydrometer 6 cannot move with the fixing block 5 under the restriction of the accommodating cavity 43, so the first clamping groove 511 will be separated from the first clamping ring 61 (see Figure 5 ), after separation, the hydrometer 6 loses its fixation and falls from the accommodating chamber 43 under the action of gravity.

[0040] In the above structure, the fixed block 5 plays the following roles: on the one hand, the fixed block 5 enables the hydrometer 6 to be placed in the inner cavity of the measuring cylinder 1 in advance, so that when measuring the specific gravity value later, it is no longer necessary to open the end cover to put in the hydrometer 6, thereby preventing the volatile liquid from volatilizing from the measuring cylinder 1; on the other hand, since the hydrometer 6 is fixed in the measuring cylinder 1 by the fixed block 5, when the measuring cylinder 1 shakes, the hydrometer will not collide with the inner wall of the measuring cylinder 1, thereby preventing the hydrometer 6 from being damaged. The sheath 4 plays the following roles: on the one hand, the sheath 4 wraps the hydrometer 6 therein, thereby preventing the hydrometer 6 from being broken when strong shaking occurs; on the other hand, when the fixed block 5 is to be separated from the hydrometer 6, the sheath 4 also serves to limit the hydrometer 6 so that it cannot move with the fixed block 5, so that the fixed block 5 can be smoothly separated from the hydrometer 6.

[0041] In this embodiment, the connection between the fixing block 5 and the sheath 4 is achieved through the following structure:

[0042] See also Figure 2 The sheath 4 is provided with a sinking hole 44 on the end surface of the first end 41, and the sinking hole 44 includes a neck hole 441 located on the upper side and a limiting hole 442 located on the lower side, wherein the neck hole 441 and the limiting hole 442 are connected to each other and the aperture of the neck hole 441 is smaller than the aperture of the limiting hole 442;

[0043] A boss 52 is formed at the lower part of the fixing block 5, and the boss 52 includes a neck 521 and a limiting portion 522, wherein the neck 521 is inserted into the neck hole 441 and can move freely along the axial direction of the neck hole 441, and the limiting portion 522 is located in the limiting hole 442 and the diameter of the limiting portion 522 is larger than the aperture of the neck hole 441 and smaller than the aperture of the limiting hole 442, and the thickness of the limiting portion 522 is approximately half of the height of the limiting hole 442, so the limiting portion 522 can move back and forth in the limiting hole 442 along the axial direction of the limiting hole 442 but cannot be moved out of the limiting hole 442, thereby realizing the above-mentioned movement of the fixing block 5 relative to the sheath 4 within a limited range;

[0044] When the hydrometer 6 is inserted into the accommodating cavity 43 of the sheath 4 and the first clamping ring 61 is clamped in the first clamping groove 511, at this time, the limiting portion 522 is in the lower part area of ​​the limiting hole 442, and the limiting portion 522 has space to move upward, see Figure 2 That is, if the fixing block 5 moves upward relative to the sheath 4, the first groove 511 will be disengaged from the first snap ring 61, and the limiting portion 522 will move to the upper part of the limiting hole 422, see Figure 5 Subsequently, if the fixing block 5 continues to be subjected to an upward force, the limiting portion 522 will also exert an upward force on the sheath 4, driving the sheath 4 to move upward.

[0045] Preferably, above the boss 52 of the fixing block 5 is a cylindrical structure with a diameter greater than the boss 52 and a height less than the boss 52, and a circle of arc-shaped grooves 53 are provided on the lower side of the cylindrical structure to facilitate fingers to fit into it and then pull the fixing block 5 to move upward.

[0046] Furthermore, a first sealing ring 45 is disposed in the neck hole 441 to seal the gap between the neck hole 441 and the neck 521 to prevent the liquid in the measuring cylinder 1 from leaking out of the gap.

[0047] Similarly, since the outer diameter of the sheath 4 is smaller than the inner diameter of the through hole 21 and there is a gap between the two, a second sealing ring 22 is further provided in the through hole 21 in this embodiment to seal the gap between the through hole 21 and the sheath 4 to prevent the liquid in the measuring cylinder 1 from leaking out of the gap.

[0048] In this embodiment, the detachable fixation of the first end 41 and the second end 42 of the sheath 4 to the through hole 21 is achieved by the following structure:

[0049] See also Figure 1 A second annular slot 211 is provided near the top of the through hole 21, and a third annular slot 212 is provided near the bottom;

[0050] See also Figure 1 and Figure 2 A second snap ring 46 matching the second clamping groove 211 is disposed on the outer wall of the first end 41 of the sheath 4, and a third snap ring 47 matching the third clamping groove 212 is disposed on the outer wall of the second end 42;

[0051] For further information, see Figure 2 The aperture of the through hole 21 above the second slot 211 is slightly larger than the aperture of the through hole 21 below it. The second snap ring 46 can only enter the second slot 211 from above the second slot 211 or can only detach from the second slot 211 from above the second slot 211, and the second snap ring 46 cannot enter the area below the second slot 211; similarly, the aperture of the through hole 21 below the third slot 212 is slightly larger than the aperture of the through hole 21 above it. The third snap ring 47 can only enter the third slot 212 from below the third slot 212 or can only detach from the third slot 212 from below the third slot 212, and the third snap ring 47 cannot enter the area above the third slot 212.

[0052] When the second snap ring 46 of the sheath 4 is inserted into the second snap groove 211 of the through hole 21, the first end 41 of the sheath 4 is fixed in the through hole 21. Figure 2 When the third snap ring 47 of the sheath 4 is inserted into the third slot 212 of the through hole 21, the second end 42 of the sheath 4 is fixed in the through hole 21, see Figure 6 ; And, when the second snap ring 46 is stuck in the second slot 211, the sheath 4 is pulled upward with a certain force, and the second snap ring 46 will be disengaged from the second slot 211, so that the sheath 4 is no longer fixed to the through hole 21 and can continue to move upward. When it moves upward to the point where the third snap ring 47 enters the through hole 21, the sheath 4 is pulled upward with a certain force, so that the third snap ring 47 can be stuck in the third slot 212.

[0053] In addition, in this embodiment, a filter screen 7 is provided on one side of the measuring cylinder 1 close to the second end cover 3 , and the filter screen 7 is fixed to the inner wall of the measuring cylinder 1 on all sides.

[0054] Among them, the above-mentioned snap rings (including the first snap ring 61, the second snap ring 46 and the third snap ring 47) and the slots (including the first slot 511, the second slot 211 and the third slot 212) belong to a common structure of connection and cooperation in the prior art. When the two components respectively provided with the snap ring and the slot are pushed towards each other, the snap ring will be inserted into the slot to achieve the connection between the two. When the two components respectively provided with the snap ring and the slot are pulled away from each other, the snap ring will be separated from the slot to achieve the separation between the two.

[0055] Before use, the specific gravity measuring device of this embodiment has a structural state as follows: Figure 1 and Figure 2As shown:

[0056] The first end cap 2 is screwed on the top of the measuring cylinder 1, the second end cap 3 is screwed on the bottom of the measuring cylinder 1, the first end 41 of the sheath 4 is fixed to the through hole 21 of the first end cap 2 by the cooperation of the second snap ring 46 and the second snap groove 211, the hydrometer 6 is inserted into the accommodating cavity 43 of the sheath 4, and at the same time, the upper end of the hydrometer 6 is inserted into the slot 51 of the fixing block 5 and the first snap ring 61 of the hydrometer 6 is inserted into the first snap groove 511 of the fixing block 5, that is, the hydrometer 6 is suspended and fixed in the measuring cylinder 1;

[0057] When using the specific gravity measuring device of this embodiment to measure the specific gravity value of the liquid to be measured, the steps are as follows:

[0058] First, unscrew the second end cap 3, and then invert the entire device, and then inject the liquid to be tested 9 into the measuring cylinder 1. During the injection, the liquid to be tested may contain impurities, which will be blocked by the filter 7 and cannot fall. When the measuring cylinder 1 is turned over, the impurities will be blocked under the filter 7, thereby preventing the impurities from floating in the measuring cylinder 1 and affecting the measurement of the specific gravity value. The state diagram after injecting the liquid to be tested 9 is as follows: Figure 3 As shown;

[0059] After that, screw the second end cap 3 back, then turn the whole device over and place it on a flat surface, such as Figure 4 As shown;

[0060] Then, the specific gravity value of the liquid to be measured 9 is measured. During the measurement process, the fixation of the hydrometer 6 needs to be released first, so that the hydrometer 6 floats in the liquid to be measured, and then the sheath 4 is removed to prevent the hydrometer 6 from contacting the sheath 4 and affecting the free floating of the hydrometer 6 in the liquid to be measured 9, and finally the specific gravity value is observed;

[0061] When releasing the fixation of the hydrometer 6, the specific steps are as follows: hold the outer wall of the measuring cylinder 1 with one hand, and hold the arc-shaped groove 53 of the fixing block 5 with the other hand, and then lift the fixing block 5 upward. During this process, the first groove 511 of the fixing block 5 will be separated from the first clamping ring 61 of the hydrometer 6, so the hydrometer 6 will lose its fixation. Under the action of gravity, the hydrometer 6 will slide down from the accommodating chamber 43 and float in the liquid 9 to be measured, and the limiting portion 522 of the fixing block 5 will move to the upper part of the limiting hole 422, see Figure 5 ;

[0062] Afterwards, when removing the sheath 4, the specific steps are as follows: continue to forcefully lift the fixing block 5 upwards. During this process, the limiting portion 522 of the fixing block 5 will exert an upward force on the sheath 4, forcing the sheath 4 to move upwards, so that the second snap ring 46 of the sheath 4 will be disengaged from the second clamping groove 211 of the through hole 21, and then the sheath 4 is moved upwards by the fixing block 5. When the third snap ring 47 of the sheath 4 moves to almost enter the through hole 21, at this time, slightly pull the fixing block 5 upwards, so that the third snap ring 47 can move upwards and then be clamped into the third clamping groove 212, so that the second end 42 of the sheath 4 is fixed in the through hole 21, see Figure 6 ;

[0063] Afterwards, since the entire sheath 4 is completely moved to the top of the measuring cylinder 1, the accommodating cavity 43 is completely separated from the hydrometer 6, and the sheath 4 does not contact the hydrometer 6, so the hydrometer 6 will stably float in the liquid to be tested 9 and will not contact other objects. Therefore, the density of the liquid (or the specific gravity value, concentration of the liquid) can be known by directly observing the value on the scale paper of the hydrometer 6 corresponding to the liquid surface of the liquid to be tested 9;

[0064] In the above process, only Figure 3 When the liquid 9 to be tested is injected into the measuring cylinder 1, there may be a situation where the liquid evaporates. However, in the process of measuring the specific gravity value later, since the hydrometer 6 is placed in the measuring cylinder 1 in advance, there is no need to open the end cover to put in the hydrometer 6 during measurement. During the measurement process, the measuring cylinder 1 is always closed, and the liquid 9 to be tested will not evaporate, thereby avoiding the situation where the evaporation of the liquid 9 to be tested affects the physical and mental health of the measuring personnel and the surrounding environment. In the existing measurement method, since the top of the measuring cylinder is always open, the volatile liquid to be tested will evaporate from the measuring cylinder. If the liquid to be tested is also toxic, corrosive or irritating, it is bound to affect the physical and mental health of the measuring personnel and the surrounding environment.

[0065] In addition, in the chemical industry, after collecting the liquid to be measured with the measuring cylinder 1, it may be limited by space and environment, and the measurement cannot be performed immediately. It is necessary to cover the end cap and leave the collection point to go to the laboratory or workbench to measure. Therefore, under the existing measurement method, after the measuring cylinder 1 is transferred to the laboratory or workbench, the end cap must be opened and the hydrometer 6 must be placed before measurement, so the liquid to be measured will evaporate in the process. After adopting the measuring device of this embodiment, after the measuring cylinder 1 is transferred to the laboratory or workbench, the end cap does not need to be opened again, the hydrometer 6 is placed in the measuring cylinder 1 in advance, and the measuring cylinder 1 is closed during the measurement process, so the liquid will not evaporate.

[0066] In this embodiment, the fixing block 5 mainly plays the role of fixing the hydrometer 6, so that the hydrometer 6 can be placed in the inner cavity of the measuring cylinder 1 in advance, and the subsequent measurement can be carried out when the measuring cylinder 1 is closed, and there is no need to open the end cover to put in the hydrometer 6, thereby avoiding the evaporation of the liquid to be measured. The sheath 4 plays the role of wrapping the hydrometer 6 to avoid the hydrometer 6 from being broken when it is shaken strongly. At the same time, when the fixing block 5 is to be separated from the hydrometer 6, the sheath 4 also plays the role of limiting the hydrometer 6 so that it cannot move with the fixing block 5, so that the fixing block 5 can be smoothly separated from the hydrometer 6, and the hydrometer 6 is no longer fixed, so that the hydrometer 6 falls into the liquid 9 to be measured to measure the specific gravity value of the liquid 9 to be measured.

[0067] Embodiment 2:

[0068] The difference between this embodiment and embodiment 1 is that: Figure 7 A liquid guide tube 32 is arranged inside the second end cover 3, one end of the liquid guide tube 32 is connected to the inner cavity of the measuring cylinder 1, and the other end extends from the side wall of the second end cover 3 and forms a port 33, which is sealed by a detachable sealing cap 34.

[0069] When the liquid 9 to be tested needs to be injected into the measuring cylinder 1, the second end cover 3 does not need to be opened. The sealing cap 34 only needs to be removed, and then a tube is connected to the port 33 to inject the liquid 9 to be tested into the measuring cylinder 1. After the injection, the sealing cap 34 is covered.

[0070] The advantage of this embodiment over the first embodiment is that the injection of the liquid 9 to be tested is carried out in a closed state without opening the second end cover 3, so that the liquid can be prevented from volatilizing as much as possible during the injection process. Therefore, whether when injecting the liquid 9 to be tested or when measuring the specific gravity value, the measuring cylinder 1 is closed, so the influence of the volatilization of the liquid on the measuring personnel and the surrounding environment can be avoided as much as possible.

[0071] In the description of the present invention, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid specific gravity measuring device, characterized in that: It comprises a measuring cylinder (1), a first end cover (2), a second end cover (3), a sheath (4), a fixing block (5) and a specific gravity meter (6); Both ends of the measuring cylinder (1) are open; The first end cover (2) is detachably mounted on one end of the measuring cylinder (1); and the first end cover (2) is provided with an axially penetrating through hole (21); The second end cover (3) covers the other end of the measuring cylinder (1) and is detachable; The sleeve (4) is inserted into the through hole (21) of the first end cover (2), and the two ends of the sleeve (4) are respectively a first end (41) and a second end (42). The sleeve (4) can selectively fix the first end (41) in the through hole (21) or the second end (42) in the through hole (21), and the fixing method is detachable. When the first end (41) of the sleeve (4) is fixed in the through hole (21), the second end (42) of the sleeve (4) is located in the inner cavity of the measuring cylinder (1), and when the second end (42) of the sleeve (4) is fixed in the through hole (21), the first end (41) of the sleeve (4) is located outside the measuring cylinder (1); at the same time, a receiving cavity (43) for accommodating the hydrometer (6) is provided in the middle of the sleeve (4), and the cavity shape of the receiving cavity (43) matches the outer contour of the hydrometer (6); The fixing block (5) is inserted into the first end (41) of the sheath (4) and cannot be separated from the first end (41), and the fixing block (5) can move relative to the sheath (4) within a limited range along the axial direction of the sheath (4); a slot (51) is provided inside the fixing block (5) for accommodating the upper end of the hydrometer (6) to be inserted therein, and a first slot (511) is provided inside the slot (51); The upper end of the hydrometer (6) is provided with a first clamping ring (61) matching the first clamping groove (511); When the hydrometer (6) is inserted into the accommodating cavity (43) of the sheath (4) and the first clamping ring (61) is clamped in the first clamping groove (511), the fixed block (5) is at the side close to the second end (42) of the sheath (4) during the moving stroke; when the fixed block (5) moves from the side close to the second end (42) to the side away from the second end (42), the hydrometer (6) cannot move with the fixed block (5) under the restriction of the accommodating cavity (43), and the first clamping groove (511) is separated from the first clamping ring (61); When the hydrometer (6) is completely inserted into the accommodating cavity (43), a small gap exists between the inner wall of the accommodating cavity (43) and the outer wall of the hydrometer (6); when the upper end of the hydrometer (6) is inserted into the slot hole (51), a gap exists between the inner wall of the slot hole (51) and the outer wall of the hydrometer (6); The end surface of the first end (41) of the sheath (4) is provided with a sinking hole (44), and the sinking hole (44) includes a neck hole (441) located on the upper side and a limiting hole (442) located on the lower side, wherein the neck hole (441) and the limiting hole (442) are connected to each other and the diameter of the neck hole (441) is smaller than the diameter of the limiting hole (442); the lower part of the fixing block (5) is formed with a convex column (52), and the convex column (52) includes a neck portion (521) and a limiting portion (522), wherein the neck portion (521) The fixing block (522) is inserted into the neck hole (441) and can move freely along the axial direction of the neck hole (441); the limiting portion (522) is located in the limiting hole (442) and the diameter of the limiting portion (522) is larger than the aperture of the neck hole (441) and smaller than the aperture of the limiting hole (442); the limiting portion (522) can move back and forth in the limiting hole (442) along the axial direction of the limiting hole (442) but cannot be moved out of the limiting hole 442, so as to realize the movement of the fixing block (5) relative to the sleeve (4) within a limited range.

2. The liquid specific gravity measuring device according to claim 1, characterized in that: A first sealing ring (45) is provided in the neck hole (441) to seal the gap between the neck hole (441) and the neck (521).

3. The liquid specific gravity measuring device according to claim 2, characterized in that: A second sealing ring (22) is provided in the through hole (21) of the first end cover (2) to seal the gap between the through hole (21) and the sheath (4).

4. The liquid specific gravity measuring device according to claim 3, characterized in that: A second card slot (211) is provided on the upper side of the through hole (21), and a third card slot (212) is provided on the lower side of the through hole (21); The outer wall of the first end (41) of the sleeve (4) is provided with a second clamping ring (46) matching the second clamping groove (211), and the outer wall of the second end (42) of the sleeve (4) is provided with a third clamping ring (47) matching the third clamping groove (212).

5. The liquid specific gravity measuring device according to claim 1, characterized in that: A filter screen (7) is provided on one side of the measuring cylinder (1) close to the second end cover (3), and the four sides of the filter screen (7) are fixed to the inner wall of the measuring cylinder (1).

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