Electronic analytical balance for mass determination

Abstract

The invention relates to the technical field of electronic analytical balances, and particularly discloses an electronic analytical balance for mass determination, which comprises a balance main body, a weighing sensor is arranged in the balance main body, a weighing cup is placed in the balance main body, and the weighing cup is positioned on one side of the weighing sensor; the gooseneck flask is internally used for bearing a detected medicine; the clamping mechanism is positioned above the weighing sensor; when the device is used, a gooseneck flask and a curved neck pipe are fixed and then placed in the center of a weight sensor, the gooseneck flask is clamped through the clamping mechanism, the gooseneck flask is turned over, a push rod is adjusted to the position above the gooseneck flask through a limiting piece, and after weighing is completed, the gooseneck flask is placed in the center of the weight sensor. According to the electronic analytical balance, part of medicine in the gooseneck flask can be discharged into the weighing cup in the electronic analytical balance body through the liquid discharging mechanism, the mass of the medicine in the weighing cup can be obtained after the medicine is weighed again, the gooseneck flask does not need to be taken out when the electronic analytical balance is used, and weighing is very convenient.

Description

Technical Field

[0001] This invention relates to the field of electronic analytical balance technology, specifically to an electronic analytical balance for mass determination. Background Technology

[0002] An electronic analytical balance is a type of balance that uses electronic sensors and microprocessor technology to measure mass. It can provide high-precision mass measurement results and usually has various functions such as automatic calibration, data logging, and statistical analysis. Electronic analytical balances are widely used in laboratories, industrial production, and quality control. They can also be used to measure the physical properties of drugs, including particle size distribution, morphological characteristics, and specific surface area, providing important experimental data for drug development.

[0003] Existing electronic analytical balances require measuring the total mass of a drug, removing the drug from the balance, and measuring it again to obtain an accurate mass. However, removing the drug requires taking the vial out of the balance before proceeding, which is not only cumbersome but also increases the risk of altering the total mass due to contact or contamination. Therefore, we propose an electronic analytical balance for mass determination. Summary of the Invention

[0004] The purpose of this invention is to provide an electronic analytical balance for mass determination, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electronic analytical balance for mass determination, comprising a balance body, a weighing sensor inside the balance body, a weighing cup placed inside the balance body, and the weighing cup located on one side of the weighing sensor;

[0006] A swan-neck flask, containing the reagent to be tested.

[0007] The clamping mechanism is located above the load cell and can clamp the swan-neck flask to weigh it.

[0008] The draining mechanism is located above the clamping mechanism. It can drain the medicine from the swan-neck flask and weigh the discharged medicine. The discharged medicine enters the weighing cup.

[0009] The clamping mechanism includes a support rod fixedly connected above the load cell, a support hole on the support rod, a telescopic rod slidably connected inside the support hole, a knob fixedly connected to the telescopic rod on the side away from the center of the load cell, and a clamping component for clamping the swan-neck flask on the side of the telescopic rod away from the knob.

[0010] The clamping component includes two clamping slots located at the end of the telescopic rod away from the knob. The clamping slots are located on both sides of the telescopic rod. A clamping rod is fixedly connected to the inner wall of each clamping slot. A clamping arm is rotatably connected to the outer side of the clamping rod. A fixing block is fixedly connected to the top of the telescopic rod. A rotating groove is opened near the clamping rod on the outer side of the support hole. The rotating groove is semi-circular. The fixing block is located in the rotating groove and rotatably connected to the rotating groove. A blocking ring is fixedly connected to the outer wall of the support rod. The blocking ring is located on the outer side of the clamping arm. An anti-slip pad is provided on the inner wall of the clamping arm.

[0011] The drainage mechanism includes a sliding rod fixedly connected above the support rod. A sliding hole is opened above the sliding rod. Two sets of limiting holes are opened on the inner wall of the sliding hole. Each set of limiting holes is arranged in an array. A sliding cylinder is slidably connected inside the sliding hole. A limiting component that can limit the movement of the sliding cylinder is provided inside the sliding cylinder.

[0012] The limiting component includes a fixed rod fixedly connected to the inner wall of the sliding cylinder, two limiting rods rotatably connected to the periphery of the fixed rod, a torsion spring fixedly connected between the fixed rod and the limiting rods, the limiting rods being scissor-shaped, limiting grooves being opened on both sides of the sliding cylinder, the limiting grooves being able to correspond to the positions of the limiting holes, the bottom of the limiting rods being located in the limiting grooves and slidably connected to the limiting grooves, a pulling cloth being fixedly connected above the two limiting rods, a rotating hole being opened on one side of the sliding cylinder, a rotating rod being rotatably connected inside the rotating hole, the end of the pulling cloth away from the limiting rod being fixedly connected to the rotating rod, and a knob being fixedly connected to the end of the rotating rod away from the sliding cylinder, the rotating rod being able to roll up the pulling cloth when it rotates.

[0013] The sliding cylinder is fixedly connected to a draining platform. The draining platform has a through hole in the center of the weighing sensor. Above the draining platform is a draining device that can drain the medicine bottle in the gooseneck flask.

[0014] The draining component includes an annular groove located around the through hole on the draining platform. An annular cylinder is fixedly connected to the inner wall of the annular groove. An annular piston is slidably connected inside the annular cylinder. An annular rod is fixedly connected to the end of the annular piston away from the annular cylinder. A connecting rod is fixedly connected to the end of the annular rod away from the annular piston. An air inlet valve and an air outlet valve are provided at the end of the annular cylinder away from the annular piston. The size of the air outlet valve is larger than that of the air inlet valve. A transmission component capable of driving the connecting rod to slide within the annular groove is provided above the connecting rod.

[0015] The transmission component includes a rotating ring fixedly connected above the connecting rod, a torsion spring II fixedly connected around the rotating ring, a fixed ring fixedly connected at the end of the torsion spring II away from the rotating ring, the fixed ring fixedly connected to the drainage platform, a knob III fixedly connected above the rotating ring, and threads opened on the inner wall of the rotating ring.

[0016] The rotating ring has a push rod inside, and the outer wall of the push rod is threaded to the rotating ring. There are scale lines below the push rod. A conical ring is fixedly connected to the bottom of the drainage platform. The conical ring is located outside the push rod, and the bottom of the conical ring is aligned with the scale lines of the push rod.

[0017] The swan-neck flask has a piston hole at the bottom and a piston that slides inside the swan-neck flask. The piston is located at the end near the piston hole, and a curved neck tube is provided at the end of the swan-neck flask away from the through hole.

[0018] This invention has at least the following beneficial effects:

[0019] In use, the swan-neck flask is fixed to the curved neck tube and placed in the center of the weight sensor. The swan-neck flask is held by the clamping mechanism and flipped over. The push rod is adjusted to the top of the swan-neck flask by the limiting component. After weighing, a portion of the medicine in the swan-neck flask is drained into the weighing cup inside the main body of the electronic analytical balance by the draining mechanism. After weighing again, the mass of the medicine in the weighing cup will be obtained. There is no need to remove the swan-neck flask during use, which is very convenient for weighing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the electronic analytical balance of the present invention;

[0021] Figure 2 This is a schematic diagram of the side structure of the electronic analytical balance of the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of the swan-neck flask of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall structure of the clamping mechanism and the draining mechanism of the present invention;

[0024] Figure 5 This is an enlarged structural schematic diagram of the clamping mechanism of the present invention;

[0025] Figure 6 This is a schematic cross-sectional view of the barrier ring portion of the present invention;

[0026] Figure 7 This is a schematic diagram of the main structure of the telescopic rod of the present invention;

[0027] Figure 8 This is a schematic diagram of the overall structure of the support rod of the present invention;

[0028] Figure 9 This is a schematic diagram of the overall structure of the limiting component of the present invention;

[0029] Figure 10 This is a cross-sectional view of the sliding rod portion of the present invention;

[0030] Figure 11 This is a schematic cross-sectional view of the sliding cylinder portion of the present invention;

[0031] Figure 12 This is a schematic diagram of the overall structure of the fixing rod of the present invention;

[0032] Figure 13 This is a schematic diagram of the overall structure of the rotating rod of the present invention;

[0033] Figure 14 This is a schematic diagram of the overall structure of the drainage platform of the present invention;

[0034] Figure 15 This is a schematic diagram of the overall structure of the draining component of the present invention;

[0035] Figure 16 This is a schematic cross-sectional view of the rotating ring portion of the present invention;

[0036] Figure 17 This is a schematic diagram of the overall structure of the push rod of the present invention;

[0037] Figure 18 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0038] In the diagram: 1. Balance body; 11. Weighing sensor; 12. Weighing cup; 2. Swan-neck flask; 21. Piston hole; 22. Piston 1; 23. Curved neck tube; 3. Clamping mechanism; 31. Support rod; 32. Support hole; 33. Telescopic rod; 34. Knob 1; 4. Drainage mechanism; 41. Sliding rod; 42. Sliding hole; 43. Limiting hole; 44. Sliding cylinder; 5. Clamping component; 51. Clamping groove; 52. Clamping rod; 53. Clamping arm; 54. Fixing block; 55. Rotating groove; 56. Barrier ring; 57. Anti-slip pad; 6. Limiting component 61. Fixed rod; 62. Limiting rod; 63. Torsion spring one; 64. Limiting groove; 65. Pulling cloth; 66. Rotating hole; 67. Rotating rod; 68. Knob two; 7. Drainage platform; 71. Through hole; 8. Drainage component; 81. Ring groove; 82. Annular cylinder; 83. Annular piston; 84. Annular rod; 85. Connecting rod; 86. Inlet valve; 87. Outlet valve; 9. Transmission component; 91. Rotating ring; 92. Torsion spring two; 93. Fixed ring; 94. Knob three; 95. Push rod; 96. Scale line; 97. Conical ring; 98. Protrusion. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] Please see Figures 1-18 This invention provides a technical solution: an electronic analytical balance for mass determination, comprising a balance body 1, a weighing sensor 11 inside the balance body 1, a weighing cup 12 placed inside the balance body 1, the weighing cup 12 being located on one side of the weighing sensor 11; a swan-neck flask 2, which contains the drug to be tested; a clamping mechanism 3, located above the weighing sensor 11, capable of clamping the swan-neck flask 2 for weighing; and a draining mechanism 4, located above the clamping mechanism 3, capable of draining the drug from the swan-neck flask 2, thereby weighing the drained drug, which enters the weighing cup 12. When using the electronic analytical balance body 1 to weigh the drug, the total mass of the container and the drug needs to be weighed first, then some of the drug needs to be poured out, and then weighed again. This invention allows for the accurate determination of the weight of the poured medicine. In use, the swan-neck flask 2 is fixed to the curved neck tube 23 and placed in the center of the weight sensor. The swan-neck flask 2 is then clamped by the clamping mechanism 3 and simultaneously flipped over. The push rod 95 is adjusted to the top of the swan-neck flask 2 by the limiting member 6. After weighing, a portion of the medicine in the swan-neck flask 2 is drained into the weighing cup 12 inside the main body 1 of the electronic analytical balance via the draining mechanism 4. A second weighing yields the weight of the medicine in the weighing cup 12. The swan-neck flask 2 does not need to be removed during use, making weighing very convenient. Both the clamping mechanism 3 and the draining mechanism 4 are located above and fixed to the weighing sensor 11. Therefore, during weighing, the clamping mechanism 3, the draining mechanism 4, and the weighing sensor 11 can be considered as a single unit, without affecting the weighing results.

[0042] The clamping mechanism 3 includes a support rod 31 fixedly connected above the load cell 11. A support hole 32 is opened above the support rod 31, and a telescopic rod 33 is slidably connected inside the support hole 32. A knob 34 is fixedly connected to the telescopic rod 33 on the side away from the center of the load cell 11. A clamping member 5 for clamping the swan-neck flask 2 is provided on the side of the telescopic rod 33 away from the knob 34. The clamping member 5 includes two clamping slots 51 opened at the end of the telescopic rod 33 away from the knob 34. The clamping slots 51 are respectively located on the telescopic rod 33. On both sides of the telescopic rod 33, a clamping rod 52 is fixedly connected to the inner wall of each clamping groove 51. A clamping arm 53 is rotatably connected to the periphery of the clamping rod 52. A fixing block 54 is fixedly connected to the top of the telescopic rod 33. A rotating groove 55 is opened on the periphery of the support hole 32 near the end of the clamping rod 52. The rotating groove 55 is semi-circular. The fixing block 54 is located in the rotating groove 55 and is rotatably connected to the rotating groove 55. A blocking ring 56 is fixedly connected to the outer wall of the support rod 31. The blocking ring 56 is located on the periphery of the clamping arm 53. An anti-slip pad 57 is provided on the inner wall of the clamping arm 53.

[0043] When the swan-neck flask 2 is placed in the center of the weighing sensor 11, the user pulls knob 34, moving it away from the clamping arm 53. This causes knob 34 to slide the telescopic rod 33 within the support hole 32. The telescopic rod 33, through the clamping rod 52, causes the clamping arm 53 to retract. During retraction, the clamping arm 53 rotates around the clamping rod 52 due to the surrounding retaining ring 56, thus clamping the swan-neck flask 2. The anti-slip pad 57 on the inner side of the clamping arm 53 prevents the swan-neck flask 2 from slipping. When the telescopic rod 33 is pulled, the fixing block 54, fixedly connected to the outer wall of the telescopic rod 33, enters the rotating groove 55. At this time, knob 34 is rotated. Knob 34 drives telescopic rod 33 to rotate. At this time, fixed block 54 rotates in rotating groove 55. Since rotating groove 55 is semi-circular, telescopic rod 33 rotates half a circle. At this time, clamping arm 53 clamps swan neck flask 2 and rotates it 180 degrees, inverting swan neck flask 2. Since piston hole 21 is opened at the bottom of swan neck flask 2, piston 22 is slidably connected inside swan neck flask 2. Piston 22 is located at the end close to piston hole 21. A curved neck tube 23 is set at the end of swan neck flask 2 away from through hole 71. Curved neck tube 23 will not spill the medicine inside swan neck flask 2. After rotation, piston hole 21 of swan neck flask 2 faces upward, which paves the way for drainage mechanism 4 to push piston 22.

[0044] The drainage mechanism 4 includes a sliding rod 41 fixedly connected above the support rod 31. A sliding hole 42 is opened above the sliding rod 41, and two sets of limiting holes 43 are opened on the inner wall of the sliding hole 42. Each set of limiting holes 43 is arranged in an array. A sliding cylinder 44 is slidably connected inside the sliding hole 42. A limiting member 6 is provided inside the sliding cylinder 44 to limit the sliding cylinder 44. The limiting member 6 includes a fixed rod 61 fixedly connected to the inner wall of the sliding cylinder 44. Two limiting rods 62 are rotatably connected to the periphery of the fixed rod 61. A torsion spring 63 is fixedly connected between the fixed rod 61 and the limiting rods 62. The rod 62 is scissor-shaped. Limiting grooves 64 are opened on both sides of the sliding cylinder 44. The limiting grooves 64 can correspond to the positions of the limiting holes 43. The bottom of the limiting rod 62 is located in the limiting groove 64 and is slidably connected to the limiting groove 64. A pulling cloth 65 is fixedly connected above the two limiting rods 62. A rotating hole 66 is opened on one side of the sliding cylinder 44. A rotating rod 67 is rotatably connected inside the rotating hole 66. The end of the pulling cloth 65 away from the limiting rod 62 is fixedly connected to the rotating rod 67. A knob 68 is fixedly connected to the end of the rotating rod 67 away from the sliding cylinder 44. When the rotating rod 67 rotates, it can retract the pulling cloth 65.

[0045] After fixing and inverting the swan-neck flask 2, first weigh the total mass. Adjust the height of the discharge mechanism 4 using the limiting component 6 to facilitate the discharge of the designated medicine after weighing. When adjusting the height of the sliding cylinder 44, first turn knob 2 68. When knob 2 68 turns, it will drive the rotating rod 67 to rotate within the rotating hole 66. When the rotating rod 67 is driven, it can retract the tension cloth 65 fixedly connected to the rotating rod 67. The tension cloth 65 drives the limiting rod 62 to rotate around the fixed rod 61. At this time, the torsion spring 1 63 retracts and stores force, and the bottom of the limiting rod 62 is aligned with the limiting hole. 43 disengages from the locking mechanism, and slides the sliding cylinder 44 within the sliding hole 42, causing the push rod 95 to hover above the piston 22 inside the swan neck flask 2. Rotating the knob 68 causes the limiting rod 62 to rotate around the fixed rod 61 due to the reset of the torsion spring 63. At this time, the bottom of the limiting rod 62 enters the limiting hole 43 through the limiting groove 64, allowing the limiting rod 62 to re-engage with the limiting hole 43. The adjusted push rod 95 can more easily and accurately push the piston 22, thereby discharging the medicine in the swan neck flask 2 into the weighing cup 12.

[0046] A draining platform 7 is fixedly connected above the sliding cylinder 44. The draining platform 7 has a through hole 71 in the center of the weighing sensor 11. A draining component 8 is provided above the draining platform 7 to drain the medicine bottle from the swan-neck flask 2. The draining component 8 includes an annular groove 81 located around the through hole 71 on the draining platform 7. An annular cylinder 82 is fixedly connected to the inner wall of the annular groove 81. An annular piston 83 is slidably connected inside the annular cylinder 82. An annular rod 84 is fixedly connected to the end of the annular piston 83 away from the annular cylinder 82. A connecting rod 85 is fixedly connected to the end of the annular rod 84 away from the annular piston 83. An inlet valve 86 and an outlet valve 87 are provided at the end of the annular cylinder 82 away from the annular piston 83. The outlet valve 87 is larger than the inlet valve 86. A connecting rod 85 is provided above the connecting rod 85. There is a transmission component 9 capable of driving the connecting rod 85 to slide within the annular groove 81. The transmission component 9 includes a rotating ring 91 fixedly connected above the connecting rod 85. A torsion spring 92 is fixedly connected to the outer periphery of the rotating ring 91. A fixed ring 93 is fixedly connected to the end of the torsion spring 92 away from the rotating ring 91. The fixed ring 93 is fixedly connected to the drainage platform 7. A knob 94 is fixedly connected above the rotating ring 91. The inner wall of the rotating ring 91 is threaded. A push rod 95 is provided inside the rotating ring 91. The outer wall of the push rod 95 is threadedly connected to the rotating ring 91. There is a scale line 96 below the push rod 95. A conical ring 97 is fixedly connected to the bottom of the drainage platform 7. The conical ring 97 is located outside the push rod 95. The bottom of the conical ring 97 is aligned with the scale line 96 of the push rod 95.

[0047] During weighing, a stationary object is placed above the weighing sensor 11, and the electronic analytical balance door is closed to avoid interference from external factors on the weighing results. After the first weighing, the limiter 6 is adjusted to move the sliding cylinder 44 to a suitable position, so that the push rod 95 is suspended above the piston 22. At this time, the knob 94 is turned, which drives the rotating ring 91 to rotate. Since there is a torsion spring 92 between the rotating ring 91 and the fixed ring 93, the rotation of the rotating ring 91 will cause the torsion spring 92 to store force. At the same time, the connecting rod 85 located at the bottom of the rotating ring 91... The annular piston 83 is pushed by the annular rod 84 to slide inside the annular cylinder 82. At this time, the air inside the annular cylinder 82 is discharged through the air outlet valve 87. When the rotating ring 91 rotates, the push rod 95, which is threaded to the center of the rotating ring 91, will rise. When the push rod 95 rises, the scale line 96 below the push rod 95 will retract into the conical ring 97. The angle of the rotating ring 91 is adjusted according to the mass of the medicine to be discharged. The scale line 96 on the outer wall of the push rod 95 is for reference only. After rotation, release the knob 3 94 and immediately... With the main body 1 of the electronic analytical balance closed, air slowly enters the annular cylinder 82 because the inlet valve 86 is smaller than the outlet valve 87. The annular piston 83 slowly drives the connecting rod 85 to slide in the annular groove 81 via the annular rod 84, which in turn rotates the ring 91, causing the push rod 95 to descend. The push rod 95 enters the swan-neck flask 2 through the piston hole 21 and pushes the piston 22. The medicine inside the swan-neck flask 2 enters the weighing cup 12 through the curved neck tube 23. When the push rod 95 stops pushing, the undischarged medicine remains in the curved neck. The inner wall of tube 23 is still supported by the weighing sensor 11, so it is not considered as the removed medicine. The reading is taken again and weighed. The second weighing result is subtracted from the first weighing result to obtain the accurate value of the medicine in the weighing cup 12. Rotate knob 34 in the opposite direction to remove the swan neck flask 2. The weighing is completed. During the first and second weighings, the container and medicine are both inside the electronic analytical balance. This makes it convenient to remove the medicine to be tested and avoids human error or container wear that may affect the weighing result when the container is removed from the main body 1 of the balance and poured out, thus making the weighing more accurate.

[0048] Example 2

[0049] Multiple protrusions 98 are fixedly connected above the annular groove 81. The protrusions 98 are close to one end of the annular piston 83. After the knob 3 94 stores force on the rotating ring 91 and is released, when the connecting rod 85 is reset, the connecting rod 85 will vibrate as it passes over the protrusions 98. Since the connecting rod 85 is fixedly connected to the rotating ring 91 and the rotating ring 91 is threadedly connected to the push rod 95, when the connecting rod 85 vibrates up and down, it will drive the push rod 95 to vibrate. The push rod 95 will shake the solid medicine out of the curved neck tube 23 by vibrating and striking the swan neck flask 2. This is to prevent the solid powder medicine from being unable to be discharged from the curved neck tube 23 and to prevent the powder medicine from clogging the curved neck tube 23.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electronic analytical balance for mass determination, comprising: The balance body (1) has a weighing sensor (11) inside and a weighing cup (12) inside, with the weighing cup (12) located on one side of the weighing sensor (11). A swan-neck flask (2), wherein the swan-neck flask (2) contains the test drug; Its characteristic is that it also includes: Clamping mechanism (3) is located above the weighing sensor (11). The clamping mechanism (3) can clamp the swan neck flask (2) and thus weigh the swan neck flask (2). The draining mechanism (4) is located above the clamping mechanism (3). The draining mechanism (4) can drain the medicine in the swan neck flask (2) and weigh the discharged medicine. The discharged medicine enters the weighing cup (12).

2. The electronic analytical balance for mass determination according to claim 1, characterized in that: The clamping mechanism (3) includes a support rod (31) fixedly connected above the weighing sensor (11), a support hole (32) is opened above the support rod (31), a telescopic rod (33) is slidably connected inside the support hole (32), a knob (34) is fixedly connected to the telescopic rod (33) on the side away from the center of the weighing sensor (11), and a clamping member (5) capable of clamping the swan neck flask (2) is provided on the side of the telescopic rod (33) away from the knob (34).

3. The electronic analytical balance for mass determination according to claim 2, characterized in that: The clamping member (5) includes two clamping slots (51) located at the end of the telescopic rod (33) away from the knob (34). The clamping slots (51) are located on both sides of the telescopic rod (33). A clamping rod (52) is fixedly connected to the inner wall of each clamping slot (51). A clamping arm (53) is rotatably connected to the periphery of the clamping rod (52). A fixing block (54) is fixedly connected above the telescopic rod (33). A rotating groove (55) is opened at the periphery of the support hole (32) near the end of the clamping rod (52). The rotating groove (55) is semi-circular. The fixing block (54) is located in the rotating groove (55) and rotatably connected to the rotating groove (55). A blocking ring (56) is fixedly connected to the outer wall of the support rod (31). The blocking ring (56) is located around the clamping arm (53). An anti-slip pad (57) is provided on the inner wall of the clamping arm (53).

4. The electronic analytical balance for mass determination according to claim 2, characterized in that: The drainage mechanism (4) includes a sliding rod (41) fixedly connected above the support rod (31). A sliding hole (42) is opened above the sliding rod (41). Two sets of limiting holes (43) are opened on the inner wall of the sliding hole (42). Each set of limiting holes (43) is arranged in an array. A sliding cylinder (44) is slidably connected inside the sliding hole (42). A limiting member (6) that can limit the sliding cylinder (44) is provided inside the sliding cylinder (44).

5. The electronic analytical balance for mass determination according to claim 4, characterized in that: The limiting member (6) includes a fixed rod (61) fixedly connected to the inner wall of the sliding cylinder (44). Two limiting rods (62) are rotatably connected to the periphery of the fixed rod (61). A torsion spring (63) is fixedly connected between the fixed rod (61) and the limiting rods (62). The limiting rods (62) are scissor-shaped. Limiting grooves (64) are opened on both sides of the sliding cylinder (44). The limiting grooves (64) can correspond to the positions of the limiting holes (43). The bottom of the limiting rods (62) is located in the limiting grooves (64) and... The two limiting rods (62) are fixedly connected to the upper part of the limiting groove (64) and the pulling cloth (65). A rotating hole (66) is opened on one side of the sliding cylinder (44). A rotating rod (67) is rotatably connected inside the rotating hole (66). The end of the pulling cloth (65) away from the limiting rod (62) is fixedly connected to the rotating rod (67). A knob (68) is fixedly connected to the end of the rotating rod (67) away from the sliding cylinder (44). When the rotating rod (67) rotates, it can retract the pulling cloth (65).

6. The electronic analytical balance for mass determination according to claim 4, characterized in that: A draining platform (7) is fixedly connected above the sliding cylinder (44). The draining platform (7) has a through hole (71) in the center of the weighing sensor (11). A draining device (8) is provided above the draining platform (7) to drain the medicine bottle in the swan neck flask (2).

7. The electronic analytical balance for mass determination according to claim 6, characterized in that: The draining component (8) includes an annular groove (81) located around the through hole (71) of the draining platform (7). An annular cylinder (82) is fixedly connected to the inner wall of the annular groove (81). An annular piston (83) is slidably connected inside the annular cylinder (82). An annular rod (84) is fixedly connected to the end of the annular piston (83) away from the annular cylinder (82). A connecting rod (85) is fixedly connected to the end of the annular rod (84) away from the annular piston (83). An air inlet valve (86) and an air outlet valve (87) are provided at the end of the annular cylinder (82) away from the annular piston (83). The size of the air outlet valve (87) is larger than that of the air inlet valve (86). A transmission component (9) is provided above the connecting rod (85) to drive the connecting rod (85) to slide in the annular groove (81).

8. The electronic analytical balance for mass determination according to claim 7, characterized in that: The transmission component (9) includes a rotating ring (91) fixedly connected above the connecting rod (85). A torsion spring (92) is fixedly connected to the periphery of the rotating ring (91). A fixed ring (93) is fixedly connected to the end of the torsion spring (92) away from the rotating ring (91). The fixed ring (93) is fixedly connected to the drainage platform (7). A knob (94) is fixedly connected above the rotating ring (91). The inner wall of the rotating ring (91) is threaded.

9. The electronic analytical balance for mass determination according to claim 8, characterized in that: The rotating ring (91) is provided with a push rod (95) inside. The outer wall of the push rod (95) is threadedly connected to the rotating ring (91). There is a scale line (96) below the push rod (95). A conical ring (97) is fixedly connected to the bottom of the drainage platform (7). The conical ring (97) is located outside the push rod (95). The bottom of the conical ring (97) is aligned with the scale line (96) of the push rod (95).

10. The electronic analytical balance for mass determination according to claim 6, characterized in that: The bottom of the swan neck flask (2) has a piston hole (21), and a piston (22) is slidably connected inside the swan neck flask (2). The piston (22) is located at the end near the piston hole (21), and a curved neck tube (23) is provided at the end of the swan neck flask (2) away from the through hole (71).

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