Nitrogen distillation instrument capable of being rapidly fixed

Abstract

The utility model discloses a nitrogen distillation instrument capable of being fixed quickly, which comprises a distillation instrument body, the distillation instrument body comprises a shell, a heating mechanism arranged on the shell, a flask fixing mechanism and a condenser pipe fixing mechanism, the flask fixing mechanism and the condenser pipe fixing mechanism are arranged on the shell, the flask fixing mechanism is positioned above the heating mechanism, and the condenser pipe fixing mechanism is positioned above the shell. The flask fixing mechanism comprises a positioning plate, a first screw rod rotationally arranged on the positioning plate and first clamping blocks rotationally connected with the first screw rod, one end of each first clamping block is fixedly connected with the shell, each first clamping block is correspondingly provided with a second clamping block, and the second clamping blocks are fixedly connected with the shell. The tail end of the second clamping block and the tail end of the first clamping block are each provided with an arc-shaped clamping piece so that a flask can be fixed through the two clamping pieces. By arranging the first clamping block, the second clamping block and the first lead screw, the distance between the first clamping block and the second clamping block is adjusted, and the flask is clamped through the two arc-shaped clamping pieces so that the flask can be rapidly fixed.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical analysis technical field more specifically, the utility model relates to a kind of nitrogen distillation apparatus of quick fixing. BACKGROUND

[0002] In the test of nitrogen content of chemical product, nitrogen distillation is a common method, and the main principle of nitrogen distillation is to use nitrogen distillation device, cooperate with corresponding chemical reagent, convert nitrogen in chemical product into ammonium radical or ammonia under heating condition, and distill ammonia out, then collect after condensation to carry out subsequent quantitative analysis.In the process of using traditional nitrogen distillation apparatus, it is more cumbersome to operate when installing and disassembling flask, and it often takes a lot of time and effort to fix the distillation flask.This not only reduces the efficiency of experimental operation, but also increases the workload of operators.A patent with authorization announcement number "CN 219273103 U" discloses a movable distillation apparatus, which includes an adjustable limiting component, the adjustable limiting component includes a moving block and an arc-shaped clamping block, the side surface of the arc-shaped clamping block is fixedly connected with an arc-shaped anti-slip pad, although the patent can fix the distillation flask by two arc-shaped clamping blocks, the patent still needs to install or disassemble the distillation flask individually, which is more cumbersome to operate. SUMMARY

[0003] An object of the present utility model is to solve at least the above problems and provide at least the advantages to be explained later.

[0004] Another object of the present utility model is to provide a nitrogen distillation apparatus that can be quickly fixed, which adjusts the distance between the first clamping block and the second clamping block by setting the first clamping block, the second clamping block and the first lead screw, and clamps the flask by two arc-shaped clamping pieces to quickly fix the flask.

[0005] To achieve these objects and other advantages of the present utility model, a nitrogen distillation apparatus that can be quickly fixed is provided, which includes:

[0006] The distillation apparatus body includes a shell, a heating mechanism arranged on the shell, a flask fixing mechanism and a condenser tube fixing mechanism arranged on the shell, the flask fixing mechanism is located above the heating mechanism, the flask fixing mechanism includes a positioning plate that can move up and down relative to the shell, a first lead screw rotatably arranged on the positioning plate, and a first clamping block rotatably connected with the first lead screw, one end of the first clamping block is fixedly connected with the shell, each first clamping block is correspondingly provided with a second clamping block, the second clamping block can move along the length direction of the first lead screw, and the end of the second clamping block and the end of the first clamping block are both provided with arc-shaped clamping pieces to fix the flask by two clamping pieces.

[0007] Preferably, two first sliding rails are vertically arranged on the shell, first sliding blocks are arranged on the first sliding rails, and the two first sliding blocks are connected with the positioning plate, so that the positioning plate can move up and down relative to the shell.

[0008] Preferably, a first rotary motor is arranged on the positioning plate, and an output shaft of the first rotary motor is connected with the first screw rod to drive the first screw rod to rotate.

[0009] Preferably, the condenser fixing mechanism comprises a second screw rod rotatably connected with the shell, a plurality of first connecting blocks equal in number to the first clamping blocks are rotatably arranged on the second screw rod, end portions of the first connecting blocks are connected with the shell, and each first connecting block is correspondingly provided with a second connecting block, the second connecting block is movable along the length direction of the second screw rod, and the distal ends of the first connecting blocks and the second connecting blocks are jointly connected with an annular elastic clamping piece to allow the condenser to pass through and be fixed, wherein the second screw rod is driven to rotate by a second rotary motor.

[0010] Preferably, the elastic clamping piece comprises two arc-shaped elastic pieces respectively connected with the distal ends of the first connecting blocks and the second connecting blocks, and the distal ends of the two elastic pieces are jointly connected with a U-shaped fixing piece to facilitate the water inlet joint and the water outlet joint of the condenser to pass through.

[0011] Preferably, a second elastic rubber layer is arranged in the elastic clamping piece.

[0012] Preferably, an L-shaped protective cover is hingedly arranged at the top end of the shell.

[0013] Preferably, a first threaded hole matched with the first screw rod is arranged on the second clamping block, a plurality of second sliding rails are arranged on the positioning plate, second sliding blocks are arranged on the second sliding rails, and the plurality of second sliding blocks are connected with the plurality of second clamping blocks one by one.

[0014] Preferably, a second threaded hole matched with the second screw rod is arranged on the second connecting block, a plurality of third sliding rails are arranged on the shell, third sliding blocks are arranged on the third sliding rails, and the plurality of third sliding blocks are connected with the plurality of second connecting blocks one by one.

[0015] Preferably, an adjusting block is arranged on the second clamping block, two adjusting holes with threads are arranged on the adjusting block, adjusting rods with threads matched with the adjusting holes are arranged in the adjusting holes, the distal ends of the two adjusting rods are jointly connected with the clamping piece, and the clamping piece and the distal ends of the two adjusting rods are rotatably connected, so that the distance between the clamping piece and the adjusting block can be adjusted by rotating the adjusting rods.

[0016] The utility model discloses at least includes following beneficial effect:

[0017] First, the utility model discloses a first clamping block, second clamping block, first screw realizes the distance between the adjustment first clamping block and second clamping block, and through two arc clamping pieces, the flask is clamped to realize the quick fixing of flask, and the convenient adjustment, the design of clamping piece increases the contact area with flask, improves the stability of fixed, the nitrogen distillation instrument is applicable to different specifications and size's flask, has stronger versatility and practicality, can satisfy the demand of different laboratory.

[0018] Second, the utility model discloses the fixing mechanism of condenser pipe through the cooperation of second screw, first connecting block, second connecting block and elastic clamping piece, realizes the stable fixing of condenser pipe, the utility model discloses it not only can enhance the structural stability of whole elastic clamping piece, and provide a spacious opening, make the water inlet joint and water outlet joint of condenser pipe when installing or disassembling condenser pipe can easily pass through, simultaneously through setting into annular, when disassembling condenser pipe still has certain protection effect to condenser pipe, avoids the first connecting block and second connecting block separation and condenser pipe and break off after separating.

[0019] Third, the utility model discloses the first elastic rubber layer in the inner wall of clamping piece, not only can provide enough buffer when clamping, effectively reduces the direct pressure of clamping piece to flask, significantly improves the protectivity and clamping stability of nitrogen distillation instrument to flask, still can increase the friction of clamping, ensures that flask still can keep stable under the condition of high speed rotation or high temperature heating, the utility model discloses through the hinged L type protection cover of shell top end, improves the safety and operating convenience of nitrogen distillation instrument, provides a safe experimental environment for experimental personnel.

[0020] The other advantages, objects and features of the utility model will be embodied partly through the following description, and will be understood by the person skilled in the art through the research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The front view of the nitrogen distillation instrument with quick fixation according to one of the technical solutions of the utility model;

[0022] Figure 2 The side view of the nitrogen distillation instrument with quick fixation according to one of the technical solutions of the utility model;

[0023] Figure 3 The structure schematic view of the flask fixing mechanism according to one of the technical solutions of the utility model;

[0024] Figure 4The structure diagram of the condenser tube fixing mechanism of one of the technical solutions of the utility model. DETAILED DESCRIPTION

[0025] The utility model makes further detailed description in combination with the drawings, so that the person skilled in the art can implement according to the description.

[0026] As Figures 1-4 The utility model provides a nitrogen distillation appearance of quick fixing, including:

[0027] Distillation appearance body, it includes casing 1, heating mechanism being located on casing 1, flask fixing mechanism and condenser tube fixing mechanism being located on casing 1, flask fixing mechanism is located heating mechanism top, flask fixing mechanism includes the locating plate 3 that can be opposite the up-and-down movement of casing 1, first lead screw 5 can be rotated and are located on the locating plate 3, with first lead screw 5 rotary joint's first clamping block 18, one end of first clamping block 18 with casing 1 fixed connection, every first clamping block 18 is correspondingly equipped with second clamping block 4, second clamping block 4 can be moved along the length direction of first lead screw 5 (realize through the screw thread cooperation between first lead screw 5 and second clamping block 4), and the end of second clamping block 4 is equipped with the arc clamping piece 6 with the end of first clamping block 18, to fix flask through two clamping pieces 6.

[0028] In the technical scheme, the heating mechanism comprises a plurality of heating sleeves arranged in sequence, the number of the heating sleeves is consistent with the number of the first clamping blocks 18, the heating sleeves are used for heating the flask, the heating sleeves have a stirring function, the heating mode of the heating sleeves is electromagnetic heating or resistance wire heating, the heating sleeves are provided with buffer pads, the shell 1 is further provided with a control unit, a display unit and operation buttons, the control unit is electrically connected with the heating sleeves, the display unit and the operation buttons are electrically connected with the control unit, and the control unit is used for adjusting the rotating speed and the heating temperature of the heating sleeves and displaying the rotating speed and the heating temperature through the display unit. This part adopts the prior art and will not be described in more detail. The shell 1 adopts the prior art, the shell 1 comprises an L-shaped support plate 101, a partition plate 102 is vertically arranged on the horizontal edge of the support plate 101, the flask fixing mechanism is arranged on the vertical edge of the support plate 101, the heating sleeves in the heating mechanism are located between the partition plate 102 and the vertical edge of the support plate 101, and the condenser tube fixing mechanism is arranged on the partition plate 102. The shell 1 serves as a support structure of the entire distillation instrument, and the shape and size of the shell 1 are designed according to actual needs. The movement of the positioning plate 3 can be realized through manual adjustment, electric adjustment or other appropriate modes. The first lead screw 5 is horizontally arranged. A first through hole is arranged through the first clamping block 18, an annular fifth sliding rail is arranged on the inner wall of the first through hole, a fifth sliding block is arranged on the fifth sliding rail, and the fifth sliding block is connected with the first clamping block 18 to realize the rotary connection between the first lead screw 5 and the first clamping block 18. Two first fixing plates 10 are arranged on the positioning plate 3, the first clamping block 18 and the second clamping block 4 are located between the two first fixing plates 10, and the first lead screw 5 is rotatably connected with the two first fixing plates 10 and can be manually driven to rotate or electrically adjusted. When the first lead screw 5 is rotated, the second clamping block 4 moves along the length direction of the first lead screw 5, so that the distance between the second clamping block 4 and the first clamping block 18 is changed. The arc-shaped design of the clamping pieces 6 can better adapt to the shape of the flask and ensure that the flask is stably fixed. When the flask needs to be fixed, the flask is first placed between the two clamping pieces 6, then the first lead screw 5 is rotated, the second clamping block 4 moves towards the first clamping block 18, and the two clamping pieces 6 clamp the flask until the flask is clamped. The condenser tube fixing mechanism is arranged on the shell 1 and is used for fixing the condenser tube. The condenser tube is used for condensing steam into liquid, and the condenser tube fixing mechanism can adopt buckles, clamps or other appropriate modes to fix the condenser tube.

[0029] During use, first, the positioning plate 3 is moved downward to place the flask in the heating jacket, then the neck of the flask is located between the first clamping block 18 and the second clamping block 4, the first lead screw 5 is rotated to move the second clamping block 4 toward the first clamping block 18 to fix the flask by the first clamping block 18 and the second clamping block 4, then the positioning plate 3 is moved upward until the flask is not in contact with the bottom of the heating jacket; a receiving bottle is placed, and a condenser is placed on the receiving bottle and fixed by the condenser fixing mechanism; the upper end of the condenser is connected with the upper end of the flask, and a water pipe is connected with the water inlet and the water outlet of the condenser, and the heating mechanism is started to heat the flask; after distillation, the condenser is separated from the flask, the positioning plate 3 is moved upward until the flask is separated from the heating jacket, the flask is cooled, and after cooling, the positioning plate 3 is moved downward until the flask is located in the heating jacket, the first lead screw 5 is rotated to separate the first clamping block 18 from the second clamping block 4, and the flask is taken out, or after distillation, the positioning plate 3 is moved downward until the flask is in contact with the bottom of the heating jacket, and after the flask is cooled, the first lead screw 5 is rotated to separate the first clamping block 18 from the second clamping block 4, and the flask is taken out.

[0030] By adopting the technical scheme, the utility model discloses a first clamping block 18, a second clamping block 4 and a first lead screw 5 are arranged to adjust the distance between the first clamping block 18 and the second clamping block 4, and two arc-shaped clamping pieces 6 are arranged to clamp the flask to quickly fix the flask and facilitate adjustment; the clamping piece 6 is designed to increase the contact area with the flask and improve the stability of fixation; the nitrogen distillation instrument is suitable for flasks of different specifications and sizes, has strong versatility and practicality, and can meet the needs of different laboratories.

[0031] In another technical scheme, two first sliding rails 2 are vertically arranged on the shell 1 (the first sliding rails 2 are vertically arranged), first sliding blocks are arranged on the first sliding rails 2 (the first sliding blocks can slide on the first sliding rails 2), the first sliding blocks are connected with the positioning plate 3 to enable the positioning plate 3 to move up and down relative to the shell 1, a supporting rod 9 is arranged on the shell 1 and is slidably connected with the positioning plate 3 (a fourth sliding rail is arranged on the supporting rod 9, a fourth sliding block is arranged on the fourth sliding rail, and the positioning plate 3 is connected with the fourth sliding block), an electric push rod 8 is arranged on the supporting rod 9, and the lower end (the extending end) of the electric push rod 8 is connected with the positioning plate 3 to drive the positioning plate 3 to slide up and down. By adopting the technical scheme, the first sliding rails 2 and the first sliding blocks are arranged to enable the positioning plate 3 to stably slide up and down along the shell 1; the supporting rod 9 and the electric push rod 8 are arranged to enable the positioning plate 3 to electrically slide up and down, and the operation convenience of the experiment is further improved.

[0032] In another technical scheme, the positioning plate 3 is provided with a first rotary motor 17 (the output shaft of the first rotary motor 17 is horizontally arranged), and the output shaft of the first rotary motor 17 is connected with the first screw rod 5 to drive the first screw rod 5 to rotate (the output shaft of the first rotary motor 17 is connected with the first screw rod 5 through a shaft coupling). By adopting the technical scheme, the flask can be quickly fixed through the cooperation of the first rotary motor 17 and the first screw rod 5.

[0033] In another technical scheme, the condenser tube fixing mechanism comprises a second screw rod 16 (two second fixed plates 15 are arranged on the shell 1, and the second screw rod 16 is rotationally connected with the two second fixed plates 15) which is rotationally connected with the shell 1, a plurality of first connecting blocks 11 (a second through hole is arranged on the first connecting block 11, an annular sixth sliding rail is arranged in the second through hole, a sixth sliding block is arranged on the sixth sliding rail, and the sixth sliding block is connected with the second screw rod 16 to realize the rotation connection between the first connecting block 11 and the second screw rod 16) are rotationally arranged on the second screw rod 16, the end of the first connecting block 11 is connected with the shell 1, a second connecting block 12 is arranged on each first connecting block 11, the second connecting block 12 is movable along the length direction of the second screw rod 16, the distal ends of the first connecting block 11 and the second connecting block 12 are jointly connected with an annular elastic clamping piece to enable the condenser tube to pass through and be fixed, and the elastic clamping piece has a certain elasticity and clamping force, wherein the second screw rod 16 is driven to rotate by a second rotary motor 14 (the second screw rod 16 is horizontally arranged, the output shaft of the second rotary motor 14 is horizontally arranged, and the output shaft of the second rotary motor 14 is connected with the second screw rod 16 through a shaft coupling), in the use process, the receiving bottle is placed at the corresponding position during installation, then the condenser tube passes through the elastic clamping piece and is connected with the receiving bottle, and then the second screw rod 16 is driven to rotate to move the second connecting block 12 towards the first connecting block 11 to clamp the condenser tube by the elastic clamping piece, after the experiment is completed, the second screw rod 16 is driven to rotate to separate the first connecting block 11 from the second connecting block 12, and the receiving bottle is removed. By adopting the technical scheme, the condenser tube fixing mechanism of the utility model realizes the stable fixation of the condenser tube through the cooperation of the second screw rod 16, the first connecting block 11, the second connecting block 12 and the elastic clamping piece.

[0034] In another technical scheme, the elastic clamping piece comprises two arc-shaped elastic pieces 13 connected with the ends of the first connecting block 11 and the second connecting block 12 respectively, and the ends of the two elastic pieces 13 are jointly connected with a U-shaped fixing piece 21 so as to facilitate the water inlet joint and the water outlet joint of the condenser pipe to pass through. In the use process (the use process is described from top to bottom, that is, the condenser pipe is inserted into the elastic clamping piece), the water inlet joint of the condenser pipe is first passed through the fixing piece 21, and then the condenser pipe is rotated until the water outlet joint and the water inlet joint of the condenser pipe are dislocated with the fixing piece 21. When the condenser pipe needs to be disassembled, the first connecting block 11 and the second connecting block 12 are separated, and only the water inlet joint or the water outlet joint of the condenser pipe needs to be rotated to correspond to the fixing piece 21. By adopting the technical scheme, the utility model not only can enhance the structural stability of the whole elastic clamping piece, but also provides a spacious opening, so that the water inlet joint and the water outlet joint of the condenser pipe can easily pass through when the condenser pipe is installed or disassembled. Meanwhile, by being arranged in a ring shape, the utility model also has a certain protective effect on the condenser pipe when the condenser pipe is disassembled, so as to avoid the condenser pipe from being broken after the first connecting block 11 and the second connecting block 12 are separated.

[0035] In another technical scheme, a second elastic rubber layer is arranged in the elastic clamping piece, and the second elastic rubber layer is made of rubber material with high elasticity, wear resistance and corrosion resistance. By adopting the technical scheme, the utility model can provide sufficient friction during clamping of the condenser pipe, so as to make the condenser pipe stable and not fall off, and can effectively reduce the pressure and friction damage to the surface of the condenser pipe.

[0036] In another technical scheme, a first elastic rubber layer is arranged on the inner wall of the clamping piece 6, and the first elastic rubber layer is made of rubber material with high elasticity, softness and wear resistance. By adopting the technical scheme, the utility model adds the first elastic rubber layer on the inner wall of the clamping piece 6, so as to provide sufficient buffer during clamping, effectively reduce the direct pressure of the clamping piece 6 on the flask, significantly improve the protection of the nitrogen distillation instrument on the flask and the stability of clamping, and increase the friction of clamping, so as to ensure that the flask can still be stable under the condition of high-speed rotation or high-temperature heating.

[0037] In another technical scheme, an L-shaped protective cover 7 is hinged to the top end of the shell 1, the protective cover 7 is connected with the shell 1 through a plurality of hinges, a hook is arranged at the top end of the shell 1, and a positioning ring is arranged on the protective cover 7. When the flask, the condenser pipe and the like need to be installed, the hook is hooked on the positioning ring to fix the protective cover 7. Before the experiment is started, the hook is separated from the positioning ring. By adopting the technical scheme, the utility model improves the safety and operation convenience of the nitrogen distillation instrument, and provides a safe experimental environment for experimenters.

[0038] In another technical solution, the second clamping block 4 is provided with a first threaded hole matched with the first lead screw 5, the positioning plate 3 is provided with a plurality of second sliding rails 19 (horizontally arranged), the second sliding rails 19 are provided with second sliding blocks (slidable), and the plurality of second sliding blocks are connected with the plurality of second clamping blocks 4 in one-to-one correspondence to realize that the second clamping block 4 can move in the horizontal direction along the positioning plate 3. By adopting the technical solution, the utility model is connected by arranging the first threaded hole matched with the first lead screw 5 on the second clamping block 4 and arranging the plurality of second sliding rails 19 and the second sliding blocks on the positioning plate 3.

[0039] In another technical solution, the second connecting block 12 is provided with a second threaded hole matched with the second lead screw 16, the shell 1 is provided with a plurality of third sliding rails 20 (horizontally arranged), the third sliding rails 20 are provided with third sliding blocks (slidable), and the plurality of third sliding blocks are connected with the plurality of second connecting blocks 12 in one-to-one correspondence to realize that the second connecting block 12 can move in the horizontal direction along the shell 1. By adopting the technical solution, the utility model is connected by arranging the second threaded hole matched with the second lead screw 16 on the second connecting block 12 and arranging the plurality of second sliding rails 19 and the second sliding blocks on the shell 1.

[0040] In another technical solution, the second clamping block 4 is provided with an adjusting block 22, the adjusting block 22 is provided with two threaded adjusting holes, the adjusting holes are provided with matched threaded adjusting rods 23, the two adjusting rods 23 are connected with the clamping piece at the ends, the clamping piece and the ends of the two adjusting rods 23 are rotationally connected to adjust the distance between the clamping piece and the adjusting block 22 by rotating the adjusting rod 23, one of the rotational connection modes is that the clamping piece is provided with a spherical accommodating cavity, the accommodating cavity is provided with rotatable balls, the accommodating cavity is connected with passages, the two adjusting rods 23 are connected with the balls by rotating (the diameter of the passage is greater than the diameter of the adjusting rod 23) through the two passages to realize the rotational connection between the adjusting rod 23 and the clamping piece. By adopting the technical solution, the utility model realizes that the clamping piece can clamp distillation bottles with different diameters by arranging the adjusting rod 23 and the auxiliary clamping piece, and on the one hand, when the distillation bottles with different diameters are replaced, the moving distance of the second clamping block is a fixed value, and the first rotating motor does not need to be adjusted again, thereby simplifying the operation and improving the work efficiency, and on the other hand, the excessive extrusion of the distillation bottle can be reduced to prevent the distillation bottle from being broken.

[0041] The number of devices and the processing scale described herein are used to simplify the description of the utility model. The application, modification and change of the nitrogen distillation instrument capable of being quickly fixed according to the utility model are obvious to those skilled in the art.

[0042] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, and therefore the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A nitrogen distillation apparatus that can be quickly fixed, characterized by, The utility model relates to a distillation instrument body, which comprises a shell, a heating mechanism arranged on the shell, a flask fixing mechanism arranged on the shell, and a condenser tube fixing mechanism. The shell is vertically provided with two first sliding rails, and the first sliding rails are provided with first sliding blocks.

2. The rapid fixable nitrogen distillation apparatus of claim 1, wherein, The positioning plate is provided with a first rotary motor, and an output shaft of the first rotary motor is connected with the first lead screw to drive the first lead screw to rotate.

3. The rapid fixable nitrogen distilling apparatus of claim 1, wherein, The condenser tube fixing mechanism comprises a second lead screw rotatably connected with the shell, and a plurality of first connecting blocks are rotatably arranged on the second lead screw.

4. The quick fixable nitrogen still of claim 3, wherein, The elastic clamping piece comprises two arc-shaped elastic pieces connected with the ends of the first connecting blocks and the second connecting blocks, respectively.

5. The quick fixable nitrogen still of claim 4, wherein, The elastic clamping piece is internally covered with a second elastic rubber layer.

6. The quick fixable nitrogen still of claim 4, wherein, The top end of the shell is hingedly connected with an L-shaped protective cover.

7. The quick fixable nitrogen still of claim 5, wherein, The second clamping block is provided with a first threaded hole matched with the first lead screw.

8. The quick fixable nitrogen still of claim 5, wherein, The second connecting block is provided with a second threaded hole matched with the second lead screw.

9. The quick fixable nitrogen distillation apparatus of claim 5, wherein, The second clamping block is provided with an adjusting block, and the adjusting block is provided with two threaded adjusting holes.

10. The quick fixable nitrogen still of claim 5, wherein, The adjusting holes are provided with matching threaded adjusting rods. The ends of the two adjusting rods are jointly connected with the clamping piece. The clamping piece is rotatably connected with the ends of the two adjusting rods to adjust the distance between the clamping piece and the adjusting block by rotating the adjusting rods.

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