Burette convenient to set

Abstract

The utility model relates to the technical field of experimental appliances, in particular to a burette convenient to arrange, which comprises a burette main body and an adjustable structure, the adjustable structure is arranged at the position close to the lower end of the burette main body, and the adjustable structure can also comprise a connecting frame, a positioning component, a guide component and a rotating component. By pulling a positioning rod to move upwards, the positioning rod drives a rectangular frame to move along a sliding groove of a connecting seat, and the positioning rod drives a spring to stretch, so that the sliding groove corresponding to the corresponding rectangular frame moves along a connecting hole through a sealing block corresponding to a first guide groove, and a solution above a burette main body is sucked into the connecting hole; at the moment, the positioning groove is separated from the connecting frame, then the positioning rod is rotated by 180 degrees and then loosened, the elastic force of the spring drives the positioning rod to reset, the sealing block pushes out the solution in the connecting hole, the solution is dropped into the flask through the lower pipe, then the positioning rod is pulled to reset the positioning rod, and accurate dropping of the solution with the volume required by an experiment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a burette which is convenient to set up. Background Art

[0002] Burettes are commonly used in chemical analysis, primarily for precisely measuring and dispensing liquids. However, existing burettes cannot precisely control the volume of solution required for an experiment. Consequently, when dripping the solution into a conical flask, the tip of the burette is often suspended, preventing the droplet from dripping freely. Instead, the droplet is wiped off the flask's inner wall. This makes it difficult to precisely set the required volume of solution, and can easily result in an excessive amount of experimental solution being dripped in, leading to experimental failure and increased drug waste. Utility Model Content

[0003] The utility model aims to solve the problem that the existing burette cannot accurately control the volume of the solution required for the experiment, and proposes a burette with convenient arrangement.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A conveniently arranged burette is designed, comprising a burette body and an adjustable structure, wherein the adjustable structure is arranged near the lower end of the burette body, wherein the adjustable structure may further comprise a connecting frame, a positioning assembly, a guide assembly, and a rotating assembly;

[0006] The guide assembly is arranged inside the burette body, a connecting frame is arranged on one side of the guide assembly, a rotating assembly is arranged on the outside of the guide assembly, and a plurality of positioning assemblies are arranged on one side of the rotating assembly.

[0007] Preferably, one side of the connecting frame is fixedly connected to the side end of the burette body;

[0008] A threaded hole is provided on the other side of the connecting frame, and a guide hole is provided in the middle of the connecting frame, and the axis of the guide hole and the threaded hole are on the same straight line;

[0009] The side wall of the guide hole is provided with a keyway.

[0010] Preferably, the guide assembly includes a sealing seat and a screw;

[0011] One side of the sealing seat is in contact with one side of the inner wall of the burette body, and the other side of the sealing seat is provided with a key block;

[0012] One end of the sealing seat away from the burette body is rotatably connected to the screw.

[0013] Preferably, the outer wall of the screw is threadedly connected to the threaded hole;

[0014] The shape of the key block is the same as that of the key slot, and the key block can match the key slot to limit the deflection of the sealing seat.

[0015] Preferably, the rotating assembly includes a first rotating seat, a second rotating seat, a third rotating seat, a fourth rotating seat, a sealing block and a connecting hole;

[0016] The inner wall of the first rotating seat is rotatably connected to the second rotating seat, and the side end of the first rotating seat is in contact with the second rotating seat;

[0017] The inner wall of the second rotating seat is rotatably connected to the third rotating seat, and the side end of the second rotating seat is in contact with the third rotating seat;

[0018] The inner wall of the third rotating seat is rotatably connected to the fourth rotating seat, and the side end of the third rotating seat is in contact with the fourth rotating seat;

[0019] A first guide groove is provided on one side of an interior of the first rotating seat, and an opening of the guide groove passes through the first rotating seat; a second guide groove is provided on one side of an interior of the second rotating seat, and an opening of the second guide groove passes through the second rotating seat; a third guide groove is provided on one side of an interior of the third rotating seat, and an opening of the third guide groove passes through the third rotating seat; a fourth guide groove is provided on one side of an interior of the fourth rotating seat, and an opening of the fourth guide groove passes through the fourth rotating seat;

[0020] The ends of the first guide groove, the second guide groove, the third guide groove and the fourth guide groove are respectively provided with connection holes, and the plurality of connection holes respectively pass through the first rotating seat, the second rotating seat, the third rotating seat and the fourth rotating seat;

[0021] One side of the outer wall of the sealing block is fitted with the connecting hole, and the other sides of the outer walls of the multiple sealing blocks are respectively fitted with the first guide groove, the second guide groove, the third guide groove and the fourth guide groove, and the extending length of the sealing block is less than the axial length of the connecting hole.

[0022] Preferably, one side of the first rotating seat, the second rotating seat, the third rotating seat and the fourth rotating seat are all in contact with the burette body;

[0023] The middle section of the first rotating seat is in contact with the burette body;

[0024] The inner wall of the fourth rotating seat is rotatably connected to the sealing seat, and the end of the fourth rotating seat is in contact with the sealing seat.

[0025] Preferably, the positioning assembly includes a connecting seat, a positioning rod and a spring;

[0026] A slide groove is provided on one side of the connecting seat, a rectangular hole is provided at one end of the slide groove, and the rectangular hole passes through the connecting seat;

[0027] A circular hole is provided at the other end of the inner portion of the chute, and the circular hole passes through the connecting seat;

[0028] The two ends of the spring are fixedly connected to the connecting seat and the positioning rod respectively, and the spring is arranged inside the sliding groove;

[0029] The size and cross-sectional shape of the side of the positioning rod adjacent to the spring are the same as those of the rectangular hole, and the outer wall of the side of the positioning rod adjacent to the spring matches the rectangular hole;

[0030] A rectangular frame is fixedly provided at the end of the positioning rod adjacent to the spring, and the shape and size of the rectangular frame are the same as those of the slide groove, and the outer wall of the rectangular frame fits the slide groove;

[0031] A positioning groove is provided on a side of the positioning rod away from the spring.

[0032] Preferably, the middle parts of the plurality of connecting seats are fixedly connected to the first rotating seat, the second rotating seat, the third rotating seat and the fourth rotating seat respectively;

[0033] The plurality of positioning grooves are engaged with the connecting frame to limit the deflection of the connecting seat.

[0034] Preferably, the inner diameter of the circular hole is the same as the inner diameter of the first guide groove, the second guide groove, the third guide groove and the fourth guide groove, and the axes of the multiple circular holes are axially in the same straight line with the opening positions of the first guide groove, the second guide groove, the third guide groove and the fourth guide groove.

[0035] Preferably, an upper tube is fixedly provided on one side of the burette body, and a lower tube is fixedly provided on the other side of the burette body.

[0036] The utility model provides a conveniently arranged burette with the beneficial effects that: by pulling the positioning rod to move upward, the positioning rod drives the rectangular frame to move along the slide groove of the connecting seat, and the positioning rod drives the spring to stretch, so that the corresponding rectangular frame corresponding to the slide groove moves along the connecting hole through the sealing block corresponding to the first guide groove, and the solution above the burette body is drawn into the inside of the connecting hole. At this time, the positioning groove is separated from the connecting frame, and then the positioning rod is rotated 180 degrees and then released. The elastic force of the spring drives the positioning rod to reset, so that the sealing block pushes the solution inside the connecting hole out, and the solution drips into the inside of the flask through the lower tube. Then, the positioning rod is pulled to reset the positioning rod, so that the solution volume required for the experiment can be accurately dripped, the possibility of experimental failure is reduced, and the waste of experimental drugs is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1This is a schematic diagram of the structure of the utility model;

[0038] Figure 2 It is a partial cross-sectional structural schematic diagram of the utility model;

[0039] Figure 3 This is a schematic structural diagram of the rotating assembly and positioning assembly of the utility model;

[0040] Figure 4 It is a schematic cross-sectional view of the first rotating seat and the positioning assembly of the present invention;

[0041] Figure 5 This is a structural exploded view of the guide assembly and the connecting frame of the present invention.

[0042] In the figure: 1. burette body; 101. upper tube; 102. lower tube; 2. rotating assembly; 201. first rotating seat; 2011. first guide groove; 202. second rotating seat; 2021. second guide groove; 203. third rotating seat; 2031. third guide groove; 204. fourth rotating seat; 2041. fourth guide groove; 205. sealing block; 206. connecting hole; 3. connecting frame; 301. threaded hole; 302. guide hole; 303. keyway; 4. positioning assembly; 401. connecting seat; 4011. slide groove; 4012. rectangular hole; 4013. round hole; 402. positioning rod; 4021. rectangular frame; 4022. positioning groove; 403. spring; 5. guide assembly; 501. sealing seat; 5011. key block; 502. screw. DETAILED DESCRIPTION

[0043] The present invention will be further described below with reference to the accompanying drawings:

[0044] This embodiment Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, a conveniently arranged burette includes a burette body 1 and an adjustable structure. The adjustable structure is arranged near the lower end of the burette body 1, wherein the adjustable structure may further include a connecting frame 3, a positioning assembly 4, a guide assembly 5 and a rotating assembly 2. The guide assembly 5 is arranged inside the burette body 1, a connecting frame 3 is provided on one side of the guide assembly 5, a rotating assembly 2 is provided on the outside of the guide assembly 5, and a plurality of positioning assemblies 4 are provided on one side of the rotating assembly 2. The positioning assembly 4 is used to limit the deflection of the rotating assembly 2.

[0045] One side of the connecting frame 3 is fixedly connected to the side end of the burette body 1, and the other side of the connecting frame 3 is provided with a threaded hole 301. A guide hole 302 is provided in the middle of the connection, and the axis of the guide hole 302 is on the same straight line as the threaded hole 301. The side wall of the guide hole 302 is provided with a keyway 303.

[0046] The guide assembly 5 includes a sealing seat 501 and a screw 502. One side of the sealing seat 501 is in contact with one side of the inner wall of the burette body 1. A key block 5011 is provided on the other side of the sealing seat 501. The end of the sealing seat 501 away from the burette body 1 is rotatably connected to the screw 502. The outer wall of the screw 502 away from the end is relatively rough to increase the friction between the personnel's hand and the screw 502. The personnel rotates the screw 502, and the screw 502 moves along the threaded hole 301 of the connecting frame 3. The screw 502 rotates along the sealing seat 501 and the sealing seat 501 moves along the guide hole 302 with the screw 502. The sealing seat 501 drives the key block 5011 to slide along the key groove 303. The outer wall of the screw 502 is threadedly connected to the threaded hole 301. The shape of the key block 5011 is the same as that of the key groove 303. The block 5011 can match with the key groove 303 to limit the deflection of the sealing seat 501. The sealing seat 501 can drive the first rotating seat 201, the second rotating seat 202, the third rotating seat 203 and the fourth rotating seat 204 to move. At the same time, the positioning assembly 4 of the first rotating seat 201, the second rotating seat 202, the third rotating seat 203 and the fourth rotating seat 204 moves together with the sealing seat 501, so that the side of the sealing seat 501 away from the connecting frame 3 is separated from the burette body 1, so that the solution inside the upper tube 101 flows into the interior of the experimental conical flask through the gap between the sealing seat 501 and the burette body 1 through the lower tube 102. After use, the screw 502 is rotated in the opposite direction to seal the gap between the sealing seat 501 and the burette body 1, so that the solution inside the burette stays inside the upper tube 101.

[0047] The rotating assembly 2 includes a first rotating seat 201, a second rotating seat 202, a third rotating seat 203, a fourth rotating seat 204, a sealing block 205 and a connecting hole 206. The inner wall of the first rotating seat 201 is rotatably connected to the second rotating seat 202. The first rotating seat 201 can rotate along the second rotating seat 202, the second rotating seat 202 can rotate along the first rotating seat 201 and the third rotating seat 203, the third rotating seat 203 can rotate along the second rotating seat 202 and the fourth rotating seat 204, and the fourth rotating seat 204 can rotate along the sealing seat 501 and the third rotating seat 203. The side end of the first rotating seat 201 is in contact with the second rotating seat 202, and the second rotating seat 20 2 is rotatably connected to the third rotating seat 203, and the side end of the second rotating seat 202 is fitted with the third rotating seat 203, the inner wall of the third rotating seat 203 is rotatably connected to the fourth rotating seat 204, and the side end of the third rotating seat 203 is fitted with the fourth rotating seat 204, a first guide groove 2011 is provided on one side of the interior of the first rotating seat 201, and the opening of the guide groove passes through the first rotating seat 201, a second guide groove 2021 is provided on one side of the interior of the second rotating seat 202, and the opening of the second guide groove 2021 passes through the second rotating seat 202, a third guide groove 2031 is provided on one side of the interior of the third rotating seat 203, and the opening of the third guide groove 2031 passes through the third rotating seat The fourth rotating seat 203 and the fourth rotating seat 204 are provided with a fourth guide groove 2041 on one side of the interior thereof, and the opening of the fourth guide groove 2041 passes through the fourth rotating seat 204, and the ends of the first guide groove 2011, the second guide groove 2021, the third guide groove 2031 and the fourth guide groove 2041 are respectively provided with connecting holes 206, and the plurality of connecting holes 206 pass through the first rotating seat 201, the second rotating seat 202, the third rotating seat 203 and the fourth rotating seat 204 respectively, and one side of the outer wall of the sealing block 205 is fitted with the connecting hole 206, and the other sides of the outer walls of the plurality of sealing blocks 205 are respectively fitted with the first guide groove 2011, the second guide groove 2021, the third guide groove 2031 and the fourth guide groove 2041, ensuring that the sealing block 205 and the connecting hole 206 are in a sealed state, and the extending length of the sealing block 205 is less than the axial length of the connecting hole 206. One side of the first rotating seat 201, the second rotating seat 202, the third rotating seat 203 and the fourth rotating seat 204 are all in contact with the burette body 1, the middle section of the first rotating seat 201 is in contact with the burette body 1, the inner wall of the fourth rotating seat 204 is rotatably connected to the sealing seat 501, and the end of the fourth rotating seat 204 is in contact with the sealing seat 501. The first rotating seat 201, the second rotating seat 202, the third rotating seat 203 and the fourth rotating seat 204 respectively drive the sealing block 205 at the corresponding position to move circumferentially, as shown in FIG. Figure 2 As shown, the plurality of positioning components 4 are connected to the fourth rotating base 204 , the third rotating base 203 , the second rotating base 202 , and the first rotating base 201 in sequence from left to right.

[0048] The positioning assembly 4 includes a connecting seat 401, a positioning rod 402 and a spring 403. A slide groove 4011 is provided on one side of the connecting seat 401. A rectangular hole 4012 is provided at one end of the slide groove 4011, and the rectangular hole 4012 passes through the connecting seat 401. A circular hole 4013 is provided at the other end of the slide groove 4011, and the circular hole 4013 passes through the connecting seat 401. The two ends of the spring 403 are fixedly connected to the connecting seat 401 and the positioning rod 402, and the spring 403 is provided at the inner end of the slide groove 4011. Inside, the size and cross-sectional shape of the positioning rod 402 adjacent to the spring 403 are the same as those of the rectangular hole 4012, and the outer wall of the positioning rod 402 adjacent to the spring 403 matches the rectangular hole 4012. A rectangular frame 4021 is fixedly provided at the end of the positioning rod 402 adjacent to the spring 403, and the shape and size of the rectangular frame 4021 are the same as those of the slide 4011. The outer wall of the rectangular frame 4021 fits the slide 4011, so that the slide 4011 is in a sealed state, and the positioning rod 402 is away from the spring 403. 03 is provided with a positioning groove 4022 on one side, and the middle parts of the multiple connecting seats 401 are fixedly connected to the first rotating seat 201, the second rotating seat 202, the third rotating seat 203 and the fourth rotating seat 204 respectively. The multiple positioning grooves 4022 are engaged with the connecting frame 3 to limit the deflection of the connecting seat 401. The inner diameter of the circular hole 4013 is the same as the inner diameter of the first guide groove 2011, the second guide groove 2021, the third guide groove 2031 and the fourth guide groove 2041. The multiple circular holes 40 The axis of 13 is in the same straight line as the opening positions of the first guide groove 2011, the second guide groove 2021, the third guide groove 2031 and the fourth guide groove 2041, respectively. The first guide groove 2011, the second guide groove 2021, the third guide groove 2031 and the fourth guide groove 2041 are in a sealed state with the corresponding slide groove through the circular hole 2041, ensuring that the upper tube 101 is fixedly provided on one side of the burette body 1 and the lower tube 102 is fixedly provided on the other side of the burette body 1. Figure 4 As shown, when the positioning rod 402 is driven, the positioning rod 402 drives the spring 403 to stretch, so that the pressure between the first guide groove 2011 and the slide groove 4011 is reduced, so that the external atmospheric pressure will push the sealing block 205 to move, thereby drawing the interior of the easy-to-top tube 101 into the interior of the connecting hole 206. At this time, the positioning groove 4022 is released from the connecting frame 3, and then the positioning rod 402 is rotated 180 degrees and then released. The elastic force of the spring 403 drives the positioning rod 402 to reset, so that the sealing block 205 pushes the solution inside the connecting hole 206 out, as shown in FIG. Figure 3 As shown, the thickness of the rectangular frame 4021 gradually increases from left to right, and the moving distance of the positioning rod 402 at the corresponding position gradually decreases, so that the corresponding sealing block 205 has different volumes when drawing the solution above the burette body into the connecting hole 206;

[0049] Specifically, if a large volume of solution is required during use, the operator rotates the screw 502, which drives the sealing seat 501 to move toward the connecting frame 3. The solution inside the upper tube 101 flows into the interior of the experimental conical flask through the gap between the sealing seat 501 and the burette body 1 and the lower tube 102. After use, the screw 502 is rotated in the opposite direction to seal the gap between the sealing seat 501 and the burette body 1, so that the solution inside the burette stays in the upper part of the burette body 1.

[0050] According to the required volume of solution, the positioning rod 402 is pulled upward, and the positioning rod 402 drives the rectangular frame 4021 to move along the slide groove of the connecting seat 401. The positioning rod 402 drives the spring 403 to stretch, so that the corresponding rectangular frame 402 corresponds to the slide groove 4011 and moves along the connecting hole 206 through the sealing block 205 corresponding to the first guide groove 2011, and the solution above the burette body 1 is drawn into the inside of the connecting hole 206. At this time, the positioning groove 4022 is separated from the connecting frame 3, and then the positioning rod 402 is rotated 180 degrees and then released. The elastic force of the spring 403 drives the positioning rod 402 to reset, so that the sealing block 205 pushes the solution inside the connecting hole 206 out, and the solution drips into the flask through the lower tube 102. Then, the positioning rod 402 is pulled to reset the positioning rod 402, so as to achieve accurate dripping of the solution volume required for the experiment.

[0051] While the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A convenient burette, characterized by: The burette comprises a main body and an adjustable structure, wherein the adjustable structure is arranged near the lower end of the main body of the burette, wherein the adjustable structure may further comprise a connecting frame, a positioning assembly, a guide assembly and a rotating assembly; The guide assembly is arranged inside the burette body, a connecting frame is arranged on one side of the guide assembly, a rotating assembly is arranged on the outside of the guide assembly, and a plurality of positioning assemblies are arranged on one side of the rotating assembly.

2. A conveniently arranged burette according to claim 1, characterized in that: One side of the connecting frame is fixedly connected to the side end of the burette body; A threaded hole is provided on the other side of the connecting frame, and a guide hole is provided in the middle of the connecting frame, and the axis of the guide hole and the threaded hole are on the same straight line; The side wall of the guide hole is provided with a keyway.

3. The conveniently arranged burette according to claim 1, characterized in that: The guide assembly includes a sealing seat and a screw; One side of the sealing seat is in contact with one side of the inner wall of the burette body, and the other side of the sealing seat is provided with a key block; One end of the sealing seat away from the burette body is rotatably connected to the screw.

4. A convenient burette according to claim 3, characterized in that: The outer wall of the screw is threadedly connected to the threaded hole; The shape of the key block is the same as that of the key slot, and the key block can match the key slot to limit the deflection of the sealing seat.

5. The conveniently arranged burette according to claim 1, characterized in that: The rotating assembly includes a first rotating seat, a second rotating seat, a third rotating seat, a fourth rotating seat, a sealing block and a connecting hole; The inner wall of the first rotating seat is rotatably connected to the second rotating seat, and the side end of the first rotating seat is in contact with the second rotating seat; The inner wall of the second rotating seat is rotatably connected to the third rotating seat, and the side end of the second rotating seat is in contact with the third rotating seat; The inner wall of the third rotating seat is rotatably connected to the fourth rotating seat, and the side end of the third rotating seat is in contact with the fourth rotating seat; A first guide groove is provided on one side of an interior of the first rotating seat, and an opening of the guide groove passes through the first rotating seat; a second guide groove is provided on one side of an interior of the second rotating seat, and an opening of the second guide groove passes through the second rotating seat; a third guide groove is provided on one side of an interior of the third rotating seat, and an opening of the third guide groove passes through the third rotating seat; a fourth guide groove is provided on one side of an interior of the fourth rotating seat, and an opening of the fourth guide groove passes through the fourth rotating seat; The ends of the first guide groove, the second guide groove, the third guide groove and the fourth guide groove are respectively provided with connection holes, and the plurality of connection holes respectively pass through the first rotating seat, the second rotating seat, the third rotating seat and the fourth rotating seat; One side of the outer wall of the sealing block is fitted with the connecting hole, and the other sides of the outer walls of the multiple sealing blocks are respectively fitted with the first guide groove, the second guide groove, the third guide groove and the fourth guide groove, and the extending length of the sealing block is less than the axial length of the connecting hole.

6. The conveniently arranged burette according to claim 5, characterized in that: One side of the first rotating seat, the second rotating seat, the third rotating seat and the fourth rotating seat are all in contact with the burette body; The middle section of the first rotating seat is in contact with the burette body; The inner wall of the fourth rotating seat is rotatably connected to the sealing seat, and the end of the fourth rotating seat is in contact with the sealing seat.

7. The conveniently arranged burette according to claim 1, characterized in that: The positioning assembly includes a connecting seat, a positioning rod and a spring; A slide groove is provided on one side of the connecting seat, a rectangular hole is provided at one end of the slide groove, and the rectangular hole passes through the connecting seat; A circular hole is provided at the other end of the inner portion of the chute, and the circular hole passes through the connecting seat; The two ends of the spring are fixedly connected to the connecting seat and the positioning rod respectively, and the spring is arranged inside the sliding groove; The size and cross-sectional shape of the side of the positioning rod adjacent to the spring are the same as those of the rectangular hole, and the outer wall of the side of the positioning rod adjacent to the spring matches the rectangular hole; A rectangular frame is fixedly provided at the end of the positioning rod adjacent to the spring, and the shape and size of the rectangular frame are the same as those of the slide groove, and the outer wall of the rectangular frame fits the slide groove; A positioning groove is provided on a side of the positioning rod away from the spring.

8. The conveniently arranged burette according to claim 7, characterized in that: The middle parts of the plurality of connecting seats are respectively fixedly connected to the first rotating seat, the second rotating seat, the third rotating seat and the fourth rotating seat; The plurality of positioning grooves are engaged with the connecting frame to limit the deflection of the connecting seat.

9. The conveniently arranged burette according to claim 7, characterized in that: The inner diameter of the circular hole is the same as the inner diameter of the first guide groove, the second guide groove, the third guide groove and the fourth guide groove, and the axes of the multiple circular holes are axially in the same straight line with the opening positions of the first guide groove, the second guide groove, the third guide groove and the fourth guide groove.

10. The conveniently-installed burette according to claim 1, characterized in that: An upper tube is fixedly provided on one side of the burette body, and a lower tube is fixedly provided on the other side of the burette body.

Images