Precise filter paper cutter for Buchner funnel

Abstract

The precise filter paper cutter comprises a funnel body, filter paper and a cutting piece, the filter paper is arranged in the funnel body, the cutting piece comprises a frame body, a cutter body and a pressing piece, the frame body is movably connected to the side wall of the funnel body in a hanging mode, a sliding groove is formed in the lower end of the frame body, and the cutter body is arranged in the sliding groove. A sliding groove is formed in the upper end of the cutter body, a protrusion is arranged at the upper end of the cutter body, movably inserted into the sliding groove and screwed and fixed through a screw, a cutter point is arranged at the lower end of the cutter body, the pressing pieces are arranged on the two sides of the cutter body and synchronously ascend and descend along the sliding groove with the cutter body, and the pressing pieces abut against the filter paper. The filter paper does not need to be taken out and cut, it is ensured that the cut filter paper is consistent with the inner bottom size of the funnel body, the filter paper cutting efficiency is improved, and the working efficiency of experimenters is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to experimental appliance technical field, especially a precision filter paper cutter for burette. BACKGROUND

[0002] Burette is a kind of ceramic instrument used in laboratory, also made of plastic, to use vacuum or negative pressure suction to filter.Filtering is the operation that liquid (or gas) in suspension (or solid particle containing heating gas) penetrates medium under the action of driving force or other external force, and solid particles and other substances are intercepted by filter medium, so that solid and other substances are separated from liquid (or gas).When filtering, a layer of filter paper needs to be pasted on the bottom of the burette, because the diameters of burettes are different in size, and filter papers of different areas need to be cut according to the shape of the bottom of the burette.The existing cutting method is to place the whole filter paper into the burette, press the filter paper to make it fit the bottom of the burette, and then take out the filter paper for cutting.This operation is troublesome, time-consuming and wasteful of labor hours, so it needs to be improved. SUMMARY

[0003] Therefore, it is necessary to provide a precision filter paper cutter for burette to solve the above problems.

[0004] A precision filter paper cutter for burette, comprising a funnel body, a filter paper and a cutting piece, the filter paper is placed in the funnel body, the cutting piece comprises a frame body, a cutter body and a pressing piece, the frame body is movably connected to the side wall of the funnel body, the lower end of the frame body is provided with a sliding groove, the upper end of the cutter body is provided with a protrusion, the protrusion is movably inserted into the sliding groove and fastened by screwing, the lower end of the cutter body is provided with a sharp edge, the pressing piece is arranged on both sides of the cutter body and synchronously lifted along the sliding groove, and the pressing piece abuts against the filter paper.

[0005] Preferably, the cutter body is provided with a ball bearing on the side abutting against the funnel body.

[0006] Preferably, the upper end of the frame body is provided with a handle.

[0007] Preferably, the pressing piece comprises a connecting part and a spring piece, the connecting part is L-shaped, the upper end of the connecting part is connected to the side of the cutter body, and the lower end of the connecting part is connected to the spring piece.

[0008] The utility model has the advantages that the filter paper does not need to be taken out for cutting, the size of the cut filter paper is consistent with the inner bottom size of the funnel body, the cutting efficiency of the filter paper is improved, and the work efficiency of the experimental personnel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1A three-dimensional view of a precision filter paper cutter for a Buchner funnel is shown in one embodiment;

[0010] Fig. 2 A three-dimensional view of the cutting member is shown.

[0011] Fig. 3 A three-dimensional view of the cutting member is shown. DETAILED DESCRIPTION

[0012] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to not unnecessarily obscure the present application.

[0013] It is to be understood that where an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. Where an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0015] As Figs. 1-3As shown, a precision filter paper cutter for a Buchner funnel includes a funnel body 1, filter paper 2, and a cutting component 3. The filter paper 2 is placed inside the funnel body 1. The cutting component 3 includes a frame 31, a blade 32, and a pressure plate 33. The frame 31 is movably attached to the side wall of the funnel body 1. A groove 311 is provided at the lower end of the frame 31. A protrusion 321 is provided at the upper end of the blade 32. The protrusion 321 is movably inserted into the groove 311 and tightened by screws. A blade tip is provided at the lower end of the blade 32. The pressure plate 33 is provided on both sides of the blade 32 and moves up and down synchronously with the blade 32 along the groove 311. The pressure plate 33 abuts against the filter paper 2. Specifically, in this embodiment, the cutting process is as follows: First, place the filter paper 2 into the funnel body 1 and press it directly to make it adhere to the bottom of the funnel body 1, preventing it from lifting up. At this time, the filter paper 2 is attached to the bottom and inner wall of the funnel body 1. However, we only need the filter paper 2 to adhere to the bottom of the funnel body 1, so we need to cut the filter paper 2 using the cutting part 3. During cutting, because the upper end of the frame 31 is designed with hooks, the upper end of the frame 31 is used to directly hang on the side wall of the funnel body 1. Because the height of the inner wall of different models of funnel body 1 is different, the blade 32 we designed is movably hung on the lower side of the frame 31. Specifically, the protrusion 321 at the upper end of the blade 32 is movably fitted into the groove 311 of the frame 31. The protrusion 321 can move up and down along the groove 311, thereby adjusting the height of the blade 32 so that the blade tip at the lower end of the blade 32 contacts the filter paper. In order to ensure that the blade tip applies a certain pressure to the filter paper, when the blade 32 descends to the designated position, the user screws on the protrusion 321. The top cap of the screw abuts against the end face of the groove 311, thereby locking the protrusion 321. At this time, the position of the blade 32 is fixed, so that when the blade 32 cuts the filter paper 2, it applies a continuous downward pressure to the filter paper 2, ensuring that the filter paper 2 is cut completely along the edge of the funnel body 1. Understandably, during the cutting process, the user only needs to hold the frame 31 and rotate it along the edge of the funnel body 1. The tip of the blade 32 contacts the folds of the filter paper, and the filter paper 2 can be cut around the inner bottom edge of the funnel body 1 to fit the inner bottom area of ​​the funnel body 1. There is no need to remove the filter paper for cutting, and it ensures that the cut filter paper is consistent with the inner bottom size of the funnel body 1, thereby improving the cutting efficiency of the filter paper and the work efficiency of the experimenter.

[0016] like Fig. 2 As shown, a ball bearing 322 is provided on the side of the blade 32 that abuts against the funnel body 1. When the user holds the cutting piece 3 and rotates it along the edge of the funnel body 1, the blade 32 and the side wall of the funnel body 1 are in contact through the ball bearing 322, which reduces the frictional resistance when the cutting piece 3 rotates along the side of the funnel body 1.

[0017] like Figs. 1-3As shown, the upper end of the frame body 31 is provided with a handle 312, which facilitates the user to pull out the cutting piece 3 from the funnel body 1 through the handle 312.

[0018] As shown, the pressing piece 33 comprises a connecting part 331 and an elastic piece 332, the connecting part 331 is L-shaped, the upper end of the connecting part 331 is connected with the side part of the cutter body 32, and the lower end of the connecting part 331 is connected with the elastic piece 332. Figs. 2-3 Specifically, the elastic piece 332 is made of copper and has good elasticity. When the user uses the cutting piece 3 to cut the filter paper 2 along the edge of the bottom of the funnel body 1, the pressing piece 33 acts on the filter paper 2 in advance before the cutting edge of the cutter body 32 cuts the filter paper 2, so that the filter paper 2 is attached to the bottom of the funnel body 1, and the local filter paper 2 is prevented from being lifted before the cutting edge of the cutter body 32 cuts the filter paper 2, so that the cut filter paper 2 is irregular.

[0019] The above-mentioned embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A precision filter paper cutter for a Buchner funnel, comprising a funnel body, characterized in that: Also include filter paper and cutting piece, the filter paper pad is in the funnel body, the cutting piece includes frame body, cutter and pressing plate, the frame body is movably hung on the side wall of the funnel body, the lower end of the frame body is provided with a sliding groove, the upper end of the cutter is provided with a protrusion, the protrusion is movably inserted into the sliding groove and fastened by screwing, the lower end of the cutter is provided with a knife tip, the pressing plate is arranged on both sides of the cutter and is synchronous with the cutter along the sliding groove, and the pressing plate abuts against the filter paper.

2. A precision filter paper cutter for a Buchner funnel as claimed in claim 1, characterized in that: The side of the cutter abutting against the funnel body is provided with a ball.

3. A precision filter paper cutter for a Buchner funnel as claimed in claim 1, characterized in that: The upper end of the frame body is provided with a lifting handle.

4. A precision filter paper cutter for a Buchner funnel as claimed in claim 1, characterized in that: The pressing plate comprises a connecting portion and an elastic sheet, the connecting portion is L-shaped, the upper end of the connecting portion is connected with the side of the cutter, and the lower end of the connecting portion is connected with the elastic sheet.

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