Kjeldahl determination bottle sample weighing frame

Abstract

The utility model relates to the technical field of experimental apparatuses, in particular to a Kjeldahl determination bottle sample weighing frame. The Kjeldahl determination bottle sample weighing frame comprises a bottle placing frame and an annular elastic wrinkled air bag embedded in the bottle placing frame, and the annular elastic wrinkled air bag is embedded in an opening in the top of a semispherical groove formed in the bottle placing frame; air storage cavities are formed in the bottle placing frame on the two sides of the hemispherical groove and communicate with the annular elastic wrinkled air bag, piston rods are inserted into the two sides of each air storage cavity, and a middle connecting plate is erected on the piston rods on the same side of the bottle placing frame. According to the sample weighing frame for the Kjeldahl determination bottle, provided by the utility model, the expanded annular elastic wrinkled air bag can be used for damping and locking the Kjeldahl determination bottle, so that the hidden dangers that the Kjeldahl determination bottle shakes and is unstable on the bottle placing frame due to transfer in the weighing process of the Kjeldahl determination bottle are avoided; the expanded annular elastic wrinkled air bag is of an elastic structure, so that the application range of the nitrogen determination bottle is widened, the volume bottle is prevented from being turned over, and the experiment precision is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a Kjeldahl nitrogen bottle weighing rack. Background Art

[0002] The Kjeldahl method is a method for determining the total nitrogen content in a compound or mixture. The specific operation method is to digest the sample with concentrated sulfuric acid in the presence of a catalyst to convert all organic nitrogen into inorganic ammonium salts, and then convert the ammonium salts into ammonia under alkaline conditions, distill it out with water vapor and absorb it with excess boric acid solution, and then titrate it with standard hydrochloric acid to calculate the nitrogen content in the sample. Since the nitrogen content of protein is relatively constant, the protein content can be calculated from its nitrogen content, so this method is a classic protein quantification method. When performing the Kjeldahl method, the experimental instrument that must be used is the Kjeldahl nitrogen bottle.

[0003] However, since the bottom of the Kjeldahl nitrogen determination bottle is spherical, it cannot stand on a horizontal plane by itself. When the nitrogen content in egg white and egg yolk is tested by Kjeldahl nitrogen determination method, it is extremely inconvenient to directly weigh. If the egg white and egg yolk samples are placed in other containers for weighing and then transferred into the Kjeldahl nitrogen determination bottle, a large amount of loss will be caused, resulting in inaccurate experimental results. At present, there is no special sample weighing rack designed for Kjeldahl nitrogen determination bottle. In the experimental process, in order to be able to accurately measure, a beaker is usually used as a sample weighing rack for Kjeldahl nitrogen determination bottle for weighing. However, when a beaker is used as a sample weighing rack, when the volume of the nitrogen determination bottle is 50mL or 100mL, it can barely be used as a support for weighing. However, when the nitrogen determination bottle uses a larger volume, such as 200mL or 500mL, a small beaker is still used to support the large volume of the nitrogen determination bottle, but a large beaker is used to exceed the maximum weighing value of the scale used in normal use.

[0004] Therefore, it is necessary to provide a new Kjeldahl nitrogen determination bottle weighing rack to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a Kjeldahl nitrogen bottle weighing rack.

[0006] The Kjeldahl nitrogen bottle weighing rack provided by the utility model comprises:

[0007] Bottle racks, and

[0008] An annular elastic pleated airbag is embedded in the bottle rack, and the annular elastic pleated airbag is embedded in the top opening of the hemispherical groove opened in the bottle rack;

[0009] The bottle racks on both sides of the hemispherical groove are provided with air storage cavities, and the middle of the air storage cavities are communicated with the annular elastic pleated airbag through a conduit, and slidably connected piston rods are inserted on both sides of the air storage cavities, and a central connecting plate is mounted on the piston rods on the same side of the bottle racks;

[0010] The central link plate is provided with a locking assembly, and a side wall of the bottle rack corresponding to the locking assembly is provided with an installation cavity.

[0011] Preferably, the locking assembly comprises a rotating rod, which is rotatably mounted in the middle of the central link plate, and an abutment plate is fixedly mounted on the inner rod head of the rotating rod, and limiting rods are fixedly mounted on the outer plate walls on both sides of the abutment plate.

[0012] Preferably, a knob is fixedly mounted on the outer rod head of the rotating rod.

[0013] Preferably, the length and width of the cavity opening of the installation cavity are smaller than the inner groove, and the bottle placing racks on both sides of the cavity opening are provided with limiting holes.

[0014] Preferably, the groove width and the groove length at the opening of the installation cavity are 0.3-0.5 cm larger than the plate width and plate length of the abutting plate.

[0015] Preferably, a pressing assembly is provided in the installation cavity, and the pressing assembly includes a pressing plate, which is arranged in the installation cavity, and a spring is fixedly installed on the inner plate wall of the pressing plate, and the other end of the spring is fixedly connected to the inner cavity wall of the installation cavity.

[0016] Compared with the related art, the Kjeldahl nitrogen bottle weighing rack provided by the utility model has the following beneficial effects:

[0017] The utility model places the sphere at the bottom of the Kjeldahl nitrogen bottle into the hemispherical groove provided on the bottle rack, and subsequently the middle connecting plates on both sides are internally pressed so that the piston rod internally presses the gas in the gas storage cavity into the annular elastic pleated airbag, so that the annular elastic pleated airbag is expanded, and therefore the expanded annular elastic pleated airbag can perform damping locking on the Kjeldahl nitrogen bottle, thereby avoiding the hidden danger of shaking and instability of the Kjeldahl nitrogen bottle on the bottle rack due to transportation during the weighing process of the Kjeldahl nitrogen bottle, and at the same time can provide stable support for the Kjeldahl nitrogen bottle when weighing, and because the expanded annular elastic pleated airbag is an elastic structure, the use range of the nitrogen bottle is increased, the volumetric bottle is prevented from tipping over, and the experimental accuracy is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural schematic diagram of a preferred embodiment of a Kjeldahl nitrogen bottle weighing rack provided by the utility model;

[0019] Figure 2 for Figure 1 The cross-sectional enlarged structural schematic diagram shown;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the locking assembly shown.

[0021] Numbers in the figure: 1, bottle rack; 1a, hemispherical groove; 1b, air storage chamber; 1c, installation chamber; 1d, limiting hole; 2, annular elastic pleated airbag; 3, piston rod; 4, center connecting plate; 5, locking assembly; 51, rotating rod; 52, abutment plate; 53, limiting rod; 54, knob; 6, pressing assembly; 61, pressing plate; 62, spring. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0024] See also Figures 1 to 3 The embodiment of the utility model provides a Kjeldahl nitrogen bottle weighing rack, which comprises: a bottle placing rack 1, an annular elastic pleated airbag 2 and a piston rod 3.

[0025] In the embodiments of the present invention, please refer to Figure 1 and Figure 3 An annular elastic pleated airbag 2 is embedded in the bottle rack 1, and the annular elastic pleated airbag 2 is embedded in the top opening of the hemispherical groove 1a opened in the bottle rack 1. Air storage cavities 1b are opened in the bottle racks 1 on both sides of the hemispherical groove 1a, and the middle part of the air storage cavity 1b is communicated with the annular elastic pleated airbag 2 through a conduit. Sliding piston rods 3 are inserted on both sides of the air storage cavity 1b, and a central connecting plate 4 is mounted on the piston rod 3 on the same side of the bottle rack 1.

[0026] It should be noted that: when weighing the Kjeldahl nitrogen bottle, the sphere at the bottom of the Kjeldahl nitrogen bottle is placed in the hemispherical groove 1a opened on the bottle rack 1, and the intermediate plates 4 on both sides are subsequently internally pressed so that the piston rod 3 presses the gas in the gas storage chamber 1b into the annular elastic pleated airbag 2, so that the annular elastic pleated airbag 2 is expanded, and the expanded annular elastic pleated airbag 2 can damp and lock the Kjeldahl nitrogen bottle, thereby avoiding the hidden danger of shaking and instability of the Kjeldahl nitrogen bottle on the bottle rack 1 due to transportation during the weighing process of the Kjeldahl nitrogen bottle, and at the same time, it can provide stable support for the Kjeldahl nitrogen bottle when weighing, and because the expanded annular elastic pleated airbag 2 is an elastic structure, the use range of the nitrogen bottle is increased, and the volume bottle is prevented from tipping over, thereby ensuring the experimental accuracy;

[0027] It is worth noting that: after weighing, remove the Kjeldahl nitrogen bottle and weigh the weight of the sample rack separately. Subsequently, subtract the weighing value of the sample rack from the value weighed at the beginning.

[0028] In the embodiments of the present invention, please refer to Figure 2 and Figure 3 The middle link plate 4 is provided with a locking assembly 5, and the locking assembly 5 includes a rotating rod 51, the rotating rod 51 is rotatably mounted in the middle of the middle link plate 4, and the inner rod head of the rotating rod 51 is fixedly mounted with an abutting plate 52, the outer plate walls on both sides of the abutting plate 52 are fixedly mounted with limiting rods 53, and the outer rod head of the rotating rod 51 is fixedly mounted with a knob 54, and the side wall of the bottle rack 1 corresponding to the locking assembly 5 is provided with an installation cavity 1c, and the cavity opening length and width of the installation cavity 1c are both smaller than the inner groove, and the bottle rack 1 on both sides of the cavity opening are provided with limiting holes 1d, and the groove width and groove length at the opening of the installation cavity 1c are 0.3-0.5cm larger than the plate width and plate length of the abutting plate 52;

[0029] A pressing assembly 6 is provided in the installation cavity 1c. The pressing assembly 6 includes a pressing plate 61. The pressing plate 61 is provided in the installation cavity 1c. A spring 62 is fixedly installed on the inner plate wall of the pressing plate 61, and the other end of the spring 62 is fixedly connected to the inner cavity wall of the installation cavity 1c.

[0030] It should be noted that: after the piston rod 3 is pushed inside the middle link plate 4 to expand the annular elastic pleated airbag 2, the knob 54 is held and the abutment plate 52 is rotated vertically to be inserted into the opening of the installation cavity 1c, and then the internal pressure plate 61 is pressed to compress the spring 62, and then the abutment plate 52 is turned horizontally so that the two limiting rods 53 on the abutment plate 52 are respectively inserted into the limiting holes 1d on both sides of the installation cavity 1c. After the knob 54 is subsequently turned, the abutment plate 52 is firmly pressed against the inner wall of the installation cavity 1c under the elastic force of the compression spring 62, thereby completing the locking of the piston rod 3;

[0031] When the Kjeldahl nitrogen bottle needs to be removed, the central connecting plate 4 is pressed internally so that the spring 62 is pressed internally by the abutting plate 52 until the limiting rod 53 slips out of the limiting hole 1d. The knob 54 is then reversed so that the horizontal abutting plate 52 is rotated to a vertical state, and then it can be slid outward from the installation cavity 1c. After completion, the central connecting plate 4 is pulled outward so that the gas in the annular elastic pleated airbag 2 is sucked into the gas storage cavity 1b, so that the annular elastic pleated airbag 2 contracts and cancels the damping and locking of the Kjeldahl nitrogen bottle.

[0032] The working principle of the Kjeldahl nitrogen bottle weighing rack provided by the utility model is as follows:

[0033] When weighing the Kjeldahl nitrogen bottle, the sphere at the bottom of the Kjeldahl nitrogen bottle is placed in the hemispherical groove 1a opened on the bottle rack 1, and the intermediate plates 4 on both sides are subsequently pressed internally so that the piston rod 3 presses the gas in the gas storage chamber 1b into the annular elastic pleated airbag 2, so that the annular elastic pleated airbag 2 is expanded. Therefore, the expanded annular elastic pleated airbag 2 can perform damping lock on the Kjeldahl nitrogen bottle, avoiding the hidden danger of shaking and instability of the Kjeldahl nitrogen bottle on the bottle rack 1 due to transportation during the weighing process of the Kjeldahl nitrogen bottle, and at the same time can provide stable support for the Kjeldahl nitrogen bottle when weighing, and because the expanded annular elastic pleated airbag 2 is an elastic structure, the use range of the nitrogen bottle is increased, and the volume bottle is prevented from tipping over, ensuring the actual Test the accuracy, and after the piston rod 3 is pushed inside the middle link plate 4 to expand the annular elastic pleated airbag 2, hold the knob 54 and rotate the abutment plate 52 vertically to insert it into the opening of the installation cavity 1c, and then press the pressing plate 61 internally to compress the spring 62, and then turn the abutment plate 52 horizontally so that the two limit rods 53 on the abutment plate 52 are respectively inserted into the limit holes 1d on both sides of the installation cavity 1c, and after the knob 54 is turned, the abutment plate 52 is firmly pressed against the inner wall of the installation cavity 1c under the elastic force of the compression spring 62, thereby completing the locking of the piston rod 3. After weighing, remove the Kjeldahl nitrogen bottle and weigh the weight of the sample rack separately, and then subtract the weighing value of the sample rack from the value weighed at the beginning;

[0034] When the Kjeldahl nitrogen bottle needs to be removed, the central connecting plate 4 is pressed internally so that the spring 62 is pressed internally by the abutting plate 52 until the limiting rod 53 slips out of the limiting hole 1d. The knob 54 is then reversed so that the horizontal abutting plate 52 is rotated to a vertical state, and then it can be slid outward from the installation cavity 1c. After completion, the central connecting plate 4 is pulled outward so that the gas in the annular elastic pleated airbag 2 is sucked into the gas storage cavity 1b, so that the annular elastic pleated airbag 2 contracts and cancels the damping and locking of the Kjeldahl nitrogen bottle.

[0035] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A Kjeldahl nitrogen bottle weighing rack, characterized in that: include: a bottle rack (1), and An annular elastic pleated airbag (2) embedded in the bottle rack (1), and the annular elastic pleated airbag (2) is embedded in the top opening of the hemispherical groove (1a) opened in the bottle rack (1); The bottle racks (1) on both sides of the hemispherical groove (1a) are provided with air storage chambers (1b), and the middle of the air storage chamber (1b) is communicated with the annular elastic pleated air bag (2) through a conduit, and slidably connected piston rods (3) are inserted on both sides of the air storage chamber (1b), and a central connecting plate (4) is mounted on the piston rods (3) on the same side of the bottle rack (1); A locking assembly (5) is provided on the central link plate (4), and a mounting cavity (1c) is provided on the side wall of the bottle rack (1) corresponding to the locking assembly (5).

2. The Kjeldahl nitrogen bottle weighing rack according to claim 1, characterized in that: The locking assembly (5) comprises a rotating rod (51) which is rotatably mounted on the middle portion of the central link plate (4), and an abutment plate (52) is fixedly mounted on the inner rod head of the rotating rod (51), and limiting rods (53) are fixedly mounted on the outer plate walls on both sides of the abutment plate (52).

3. The Kjeldahl nitrogen bottle weighing rack according to claim 2, characterized in that: A knob (54) is fixedly mounted on the outer rod head of the rotating rod (51).

4. The Kjeldahl nitrogen bottle weighing rack according to claim 2, characterized in that: The length and width of the cavity opening of the installation cavity (1c) are both smaller than the inner groove, and the bottle placing racks (1) on both sides of the cavity opening are provided with limiting holes (1d).

5. The Kjeldahl nitrogen bottle weighing rack according to claim 4, characterized in that: The groove width and groove length at the opening of the installation cavity (1c) are both 0.3-0.5 cm larger than the plate width and plate length of the abutting plate (52).

6. The Kjeldahl nitrogen bottle weighing rack according to claim 1, characterized in that: A pressing assembly (6) is provided in the installation cavity (1c), and the pressing assembly (6) comprises a pressing plate (61). The pressing plate (61) is arranged in the installation cavity (1c), and a spring (62) is fixedly installed on the inner plate wall of the pressing plate (61), and the other end of the spring (62) is fixedly connected to the inner cavity wall of the installation cavity (1c).

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