A novel sampling structure for a carboxylated butadiene-nitrile latex reactor

Abstract

The invention discloses a novel sampling structure of a carboxyl nitrile latex reactor, and relates to the technical field of sampling, comprising: a reactor body, a motor is fixedly installed on the top of the reactor body, a feed pipe is fixedly installed on the top of the reactor body, a stirring blade is fixedly installed on the output end of the motor, and a discharge pipe is fixedly installed on the bottom of the reactor body; a sampling device, the sampling device is arranged on the surface of the reactor body, the sampling device comprises an electric telescopic rod, a connecting pipe, a fixed plate, a fixed rod, a sealing plate, a sampling port, a sampling tube, an L-shaped slide plate and a limiting plate, when the electric telescopic rod is started, the output end of the electric telescopic rod contracts to drive the fixed plate to move in a direction close to the reactor body, and the electric telescopic rod is fixedly installed on the outer wall of the reactor body to prevent the L-shaped slide plate from being accidentally touched, so that the L-shaped slide plate releases the limiting of the sampling tube and affects the sampling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sampling, in particular to a novel carboxyl nitrile latex reactor sampling structure. Background Art

[0002] Carboxylated nitrile latex is an anionic polymer emulsion. The molecular weight and particle size distribution of the latex are relatively uniform. It is resistant to oil, solvent, acid and alkali. It can be cross-linked with sulfur and metal oxides. Its stability is better than that of natural latex.

[0003] The patent with patent announcement number CN218981536U relates to a novel carboxyl nitrile latex reactor sampling structure, including a base, the top of the base is fixedly connected to the reactor body, the top of the base near the side is fixedly connected to the side panel, the inner wall of the side panel is provided with a cavity, the inner wall of the cavity is fixedly installed with a drive motor, the output end of the drive motor is fixedly connected to a screw rod, the surface of the screw rod is connected to a nut, one end of the nut is fixedly connected to a smooth ball table, the patented structure adds a convenient sampling structure inside the reactor, and the sampling structure is a sealed pipe under normal conditions, and can ensure that the sampling material is a uniform bottom material, while ensuring the uniform mixing of the materials inside the reactor, and the staff can freely adjust the temperature and pressure inside the reactor, which brings convenience to the staff's work.

[0004] In the above patent, a convenient sampling structure is added inside the reactor, and the sampling structure is a sealed plug under normal conditions, and can ensure that the sampling material is a uniform bottom material, while ensuring uniform mixing of the materials inside the reactor, and the staff can freely adjust the temperature and pressure inside the reactor, which brings convenience to the staff's work. However, during the sampling process, the raw materials may leak out, affecting the sampling efficiency. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a novel carboxyl nitrile latex reactor sampling structure, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a novel carboxyl nitrile latex reactor sampling structure, comprising: a reactor body, a motor is fixedly installed on the top of the reactor body, a feed pipe is fixedly installed on the top of the reactor body, a stirring blade is fixedly installed on the output end of the motor, and a discharge pipe is fixedly installed on the bottom of the reactor body; a sampling device, the sampling device is arranged on the surface of the reactor body, the sampling device comprises an electric telescopic rod, a connecting pipe, a fixed plate, a fixed rod, a sealing plate, a sampling port, a sampling tube, an L-shaped slide plate and a limit plate, when the electric telescopic rod is started, the contraction of the output end of the electric telescopic rod will drive the fixed plate to move toward the direction close to the reactor body, and the fixed plate moves toward the direction close to the reactor body. The movement will drive the fixed rod to move in the direction close to the reactor body, the electric telescopic rod is fixedly installed on the outer wall of the reactor body, the connecting pipe is fixedly installed on the surface of the reactor body, the fixed plate is fixedly installed on the output end of the electric telescopic rod, the fixed rod is fixedly installed on a side of the fixed plate close to the reactor body, the sealing plate is fixedly installed on a side of the fixed rod away from the fixed plate, the sampling port is fixedly installed on the bottom of the connecting pipe, the sampling tube is arranged on the surface of the sampling port, the L-shaped slide plate is slidably installed on the bottom of the connecting pipe, the limiting plate is fixedly installed on the bottom of the fixed plate, and the movement of the fixed plate in the direction close to the reactor body will drive the limiting plate to move in the direction close to the L-shaped slide plate, and the L-shaped slide plate is limited by the limiting plate.

[0007] According to the above technical solution, a No. 1 spring is arranged between the L-shaped slide plate and the connecting tube, and the No. 1 spring drives the L-shaped slide plate to reset. The L-shaped slide plate contacts the surface of the sampling tube, and the sampling tube is limited by the L-shaped slide plate.

[0008] According to the above technical solution, the connecting tube is provided with an anti-residue device for scraping the inner wall of the connecting tube, and the sampling device is provided with an anti-clogging device. The anti-residue device includes an L-shaped push rod, a connecting seat, a clamping rod and a push block. The L-shaped push rod is driven to move in a direction close to the reactor body by the fixed plate. The movement of the L-shaped push rod in a direction close to the reactor body will push the push block downward. The L-shaped push rod is fixedly installed on the surface of the fixed plate, the connecting seat is fixedly installed on the circumferential surface of the connecting tube, the clamping rod is rotatably installed on the inner wall of the connecting seat, and the push block is slidably installed on the inner wall of the connecting seat.

[0009] According to the above technical solution, a fixed block is fixedly installed on the inner wall of the connecting pipe, a circular ring is fixedly installed on a side of the fixed block away from the inner wall of the connecting pipe, a spiral ring is rotatably installed on the inner wall of the circular ring, a spiral groove is opened on the surface of the fixed rod, the spiral ring is threadedly connected to the fixed rod, a scraper is fixedly installed on the surface of the spiral ring, and the spiral ring can be rotated along the direction of the spiral groove by moving the fixed rod toward the reactor body. The rotation of the spiral ring will drive the scraper to rotate, and the rotation of the scraper can effectively remove the sediment near the connecting pipe.

[0010] According to the above technical solution, a No. 1 torsion spring is arranged between the clamping rod and the connecting seat, and the No. 1 torsion spring drives the clamping rod to reset. The push block is arranged above the clamping rod, and the clamping rod is pushed to rotate by the push block moving downward.

[0011] According to the above technical solution, the anti-blocking device includes a sliding frame, a triangular block and a dredging rod. The scraper will contact the triangular block during rotation, and the scraper will push the triangular block to move downward. The downward movement of the triangular block will drive the sliding frame to move downward, and the downward movement of the sliding frame will drive the dredging rod to move downward. The sliding frame is slidably installed on the inner wall of the sampling port, the triangular block is fixedly installed on the top of the sliding frame, and the dredging rod is fixedly installed on the bottom of the sliding frame.

[0012] According to the above technical solution, a groove is provided on the surface of the sliding frame, a rotating plate is rotatably installed on the inner wall of the groove, a support plate is fixedly installed on the inner wall of the sampling port, an arc plate is slidably installed on the top of the support plate, a connecting frame is fixedly installed on the surface of the arc plate, and the end of the rotating plate away from the groove is rotatably installed on the inner wall of the connecting frame. The movement of the connecting frame in the direction away from the inner wall of the sampling tube will drive the arc plate to move in the direction away from the inner wall of the sampling tube.

[0013] According to the above technical solution, a No. 2 spring is arranged between the sliding frame and the sampling port, and the No. 2 spring drives the sliding frame to reset. A No. 3 spring is arranged between the support plate and the arc plate, and the No. 3 spring drives the arc plate to reset.

[0014] The present invention provides a novel carboxyl nitrile latex reactor sampling structure, which has the following beneficial effects:

[0015] (1) The present invention moves the sealing plate in a direction away from the connecting tube, so that the solution enters the sampling port through the connecting tube and then enters the sampling tube from the sampling port, making sampling faster and more convenient and improving the sampling efficiency. At the same time, the fixed plate moves in a direction close to the reactor body, which drives the limiting plate to move in a direction close to the L-shaped slide plate. The L-shaped slide plate is limited by the limiting plate to prevent the L-shaped slide plate from being accidentally touched, causing the L-shaped slide plate to release the limit on the sampling tube and affect the sampling efficiency.

[0016] (2) In the present invention, the downward movement of the push block will push the clamping rod to rotate downward, and the downward rotation of the clamping rod will clamp the sampling tube, thereby improving the stability of sampling and preventing the user from taking the sampling tube by hand during the sampling process, which would pose a safety hazard. At the same time, the rotation of the scraper can effectively remove the sediment near the connecting tube, preventing the accumulation or sediment inside the sampling port from affecting the uniformity of the sample and causing uneven sample composition during sampling. By scraping off the sediment or accumulation inside the sampling port, it can ensure that the sample taken out is more uniform, avoiding the influence of local agglomeration or sedimentation on the final sample quality, thereby improving the representativeness of the sample.

[0017] (3) In the present invention, the sliding frame moves downward to drive the unblocking rod to move downward. The downward movement of the unblocking rod can unblock the inside of the sampling port to prevent the inside of the sampling port from being blocked and affecting the sampling effect. At the same time, the arc plate moves away from the inner wall of the sampling tube to crush the lumps blocking the inside of the sampling port. If the lumps are not processed, they may cause the sampling port to be blocked during the sampling process. Crushing the lumps helps to maintain the normal operation of the sampling device and avoid affecting the sampling efficiency due to blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the connecting pipe of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the fixing plate and the L-shaped push rod of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the anti-residue device of the present invention;

[0023] Figure 6 For the present invention Figure 5 A schematic diagram of the structure enlargement of part A;

[0024] Figure 7 It is a schematic structural diagram of the anti-clogging device of the present invention.

[0025] In the figure: 1. reactor body; 2. motor; 3. feed pipe; 4. stirring blade; 5. discharge pipe; 6. electric telescopic rod; 7. connecting pipe; 8. fixing plate; 9. fixing rod; 10. sealing plate; 11. sampling port; 12. sampling tube; 13. L-shaped slide plate; 14. limit plate; 151. L-shaped push rod; 152. connecting seat; 153. clamping rod; 154. push block; 155. fixing block; 156. circular ring; 157. spiral ring; 158. scraper; 161. sliding frame; 162. triangular block; 163. dredging rod; 164. rotating plate; 165. support plate; 166. arc plate; 167. connecting frame. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 4 One embodiment of the present invention is: a novel carboxyl nitrile latex reactor sampling structure, comprising: a reactor body 1, a motor 2 is fixedly installed on the top of the reactor body 1, a feed pipe 3 is fixedly installed on the top of the reactor body 1, a stirring blade 4 is fixedly installed on the output end of the motor 2, and a discharge pipe 5 is fixedly installed at the bottom of the reactor body 1; a sampling device, the sampling device is arranged on the surface of the reactor body 1, and the sampling device includes an electric telescopic rod 6, a connecting pipe 7, a fixing plate 8, a fixing rod 9, a sealing plate 10, a sampling port 11, a sampling tube 12, an L-shaped slide plate 13 and a limiting plate 14, and the fixing plate 8 moves toward the direction close to the reactor body 1, which will drive the fixing rod 9 to move toward the direction close to the reactor body 1. , making sampling faster and more convenient, and improving sampling efficiency, the electric telescopic rod 6 is fixedly installed on the outer wall of the reactor body 1, the connecting pipe 7 is fixedly installed on the surface of the reactor body 1, the fixed plate 8 is fixedly installed on the output end of the electric telescopic rod 6, the fixed rod 9 is fixedly installed on the side of the fixed plate 8 close to the reactor body 1, the sealing plate 10 is fixedly installed on the side of the fixed rod 9 away from the fixed plate 8, the sampling port 11 is fixedly installed at the bottom of the connecting pipe 7, the sampling tube 12 is arranged on the surface of the sampling port 11, the L-shaped slide plate 13 is slidably installed at the bottom of the connecting pipe 7, and the limit plate 14 is fixedly installed at the bottom of the fixed plate 8 to prevent the L-shaped slide plate 13 from being accidentally touched, causing the L-shaped slide plate 13 to release the limit on the sampling tube 12, affecting the sampling efficiency.

[0028] A spring No. 1 is arranged between the L-shaped slide plate 13 and the connecting tube 7 , and the spring No. 1 drives the L-shaped slide plate 13 to reset, and the L-shaped slide plate 13 contacts the surface of the sampling tube 12 , and the sampling tube 12 is limited by the L-shaped slide plate 13 .

[0029] When the present embodiment is working, the stirring blade 4 is driven to rotate by the rotation of the motor 2, and the rotation of the stirring blade 4 will drive the carboxyl nitrile latex inside the reactor body 1 to be evenly mixed. At the same time, when sampling is needed, the electric telescopic rod 6 is started, and the contraction of the output end of the electric telescopic rod 6 will drive the fixed plate 8 to move toward the reactor body 1, and the movement of the fixed plate 8 toward the reactor body 1 will drive the fixed rod 9 toward the reactor body 1, and the movement of the fixed rod 9 toward the reactor body 1 will drive the sealing plate 10 to move away from the connecting tube 7, and the sealing plate 10 moves away from the connecting tube 7, so that the solution enters the sampling port 11 through the connecting tube 7, and then enters the sampling tube 12 through the sampling port 11, so that sampling is faster and more convenient. The sampling efficiency is improved. At the same time, when the sampling tube 12 is docked with the sampling port 11, the edge of the sampling tube 12 will contact the L-shaped slide plate 13, and the sampling tube 12 will push the L-shaped slide plate 13 to move away from the sampling port 11. When the sampling tube 12 is completely docked, the No. 1 spring will drive the L-shaped slide plate 13 to reset. The reset of the L-shaped slide plate 13 will limit the sampling tube 12 to prevent the sampling tube 12 from falling off due to loose docking and affecting the sampling results. At the same time, the movement of the fixed plate 8 toward the direction close to the reactor body 1 will drive the limiting plate 14 to move toward the direction close to the L-shaped slide plate 13. The L-shaped slide plate 13 is limited by the limiting plate 14 to prevent the L-shaped slide plate 13 from being accidentally touched, causing the L-shaped slide plate 13 to release the limit on the sampling tube 12 and affect the sampling efficiency.

[0030] See also Figure 1-Figure 7 On the basis of the above embodiment, in another embodiment of the present invention, an anti-residue device for scraping the inner wall of the connecting tube 7 is provided on the connecting tube 7, and an anti-clogging device is provided on the sampling device. The anti-residue device includes an L-shaped push rod 151, a connecting seat 152, a clamping rod 153 and a push block 154. The L-shaped push rod 151 is fixedly mounted on the surface of the fixing plate 8, the connecting seat 152 is fixedly mounted on the circumferential surface of the connecting tube 7, the clamping rod 153 is rotatably mounted on the inner wall of the connecting seat 152, and the push block 154 is slidably mounted on the inner wall of the connecting seat 152. The sampling tube 12 is clamped by rotating the clamping rod 153 downward, thereby improving the stability of sampling and preventing the user from taking the sampling tube 12 by hand during the sampling process, which poses a safety hazard.

[0031] A fixed block 155 is fixedly installed on the inner wall of the connecting tube 7, a circular ring 156 is fixedly installed on a side of the fixed block 155 away from the inner wall of the connecting tube 7, a spiral ring 157 is rotatably installed on the inner wall of the circular ring 156, a spiral groove is provided on the surface of the fixing rod 9, the spiral ring 157 is threadedly connected to the fixing rod 9, a scraper 158 is fixedly installed on the surface of the spiral ring 157 to prevent accumulation or sediment inside the sampling port 11 from affecting the uniformity of the sample and causing uneven sample composition during sampling.

[0032] A torsion spring No. 1 is arranged between the clamping rod 153 and the connecting seat 152, and the clamping rod 153 is reset by the torsion spring No. 1. The push block 154 is arranged above the clamping rod 153, and the clamping rod 153 is pushed to rotate by the push block 154 moving downward.

[0033] The anti-clogging device includes a sliding frame 161, a triangular block 162 and a clearing rod 163. The sliding frame 161 is slidably installed on the inner wall of the sampling port 11, the triangular block 162 is fixedly installed on the top of the sliding frame 161, and the clearing rod 163 is fixedly installed on the bottom of the sliding frame 161. The clearing rod 163 moves downward to clear the inside of the sampling port 11 to prevent the inside of the sampling port 11 from being blocked and affecting the sampling effect.

[0034] A groove is provided on the surface of the sliding frame 161, and a rotating plate 164 is rotatably installed on the inner wall of the groove, a supporting plate 165 is fixedly installed on the inner wall of the sampling port 11, an arc plate 166 is slidably installed on the top of the supporting plate 165, and a connecting frame 167 is fixedly installed on the surface of the arc plate 166. The end of the rotating plate 164 away from the groove is rotatably installed on the inner wall of the connecting frame 167. The arc plate 166 can be moved in a direction away from the inner wall of the sampling tube 12 to crush the lumps blocking the inside of the sampling port 11. If the lumps are not processed, the sampling port 11 may be blocked during the sampling process. Crushing the lumps helps to maintain the normal operation of the sampling device and avoid affecting the sampling efficiency due to blockage.

[0035] A No. 2 spring is provided between the sliding frame 161 and the sampling port 11, and the No. 2 spring drives the sliding frame 161 to reset. A No. 3 spring is provided between the support plate 165 and the arc plate 166, and the No. 3 spring drives the arc plate 166 to reset.

[0036] When the present embodiment is working, the fixed plate 8 moves toward the direction close to the reactor body 1, driving the L-shaped push rod 151 to move toward the direction close to the reactor body 1. The L-shaped push rod 151 moves toward the direction close to the reactor body 1, which pushes the push block 154 to move downward. The push block 154 moves downward, which pushes the clamping rod 153 to rotate downward. The clamping rod 153 rotates downward to clamp the sampling tube 12, thereby improving the sampling stability. At the same time, it prevents the user from taking the sampling tube 12 by hand during the sampling process, which poses a safety hazard. At the same time, the fixed rod 9 moves toward the reactor body 1, and the L-shaped push rod 151 moves toward the reactor body 1, which pushes the push block 154 to move downward. The push block 154 moves downward, which pushes the clamping rod 153 to rotate downward. The movement of the kettle body 1 in the direction will cause the spiral ring 157 to rotate along the direction of the spiral groove. The rotation of the spiral ring 157 will drive the scraper 158 to rotate. The rotation of the scraper 158 can effectively remove the sediment near the connecting pipe 7 to prevent the accumulation or sediment inside the sampling port 11 from affecting the uniformity of the sample and causing uneven sample composition during sampling. By scraping off the sediment or accumulation inside the sampling port 11, it can ensure that the sample taken out is more uniform, avoiding the influence of local agglomeration or precipitation on the final sample quality, thereby improving the representativeness of the sample.

[0037] The scraper 158 will contact the triangular block 162 during the rotation process, and the scraper 158 will push the triangular block 162 to move downward. The downward movement of the triangular block 162 will drive the sliding frame 161 to move downward, and the downward movement of the sliding frame 161 will drive the dredging rod 163 to move downward. The downward movement of the dredging rod 163 will dredge the inside of the sampling port 11 to prevent the inside of the sampling port 11 from being blocked and affecting the sampling effect. At the same time, the downward movement of the sliding frame 161 will drive the rotating plate 164 to move downward, and the downward movement of the rotating plate 164 will push The movable connecting frame 167 moves in a direction away from the inner wall of the sampling tube 12. The movement of the connecting frame 167 in a direction away from the inner wall of the sampling tube 12 will drive the arc plate 166 to move in a direction away from the inner wall of the sampling tube 12. The movement of the arc plate 166 in a direction away from the inner wall of the sampling tube 12 can crush the lumps blocking the inside of the sampling port 11. If the lumps are not processed, the sampling port 11 may be blocked during the sampling process. Crushing the lumps helps to maintain the normal operation of the sampling device and avoid affecting the sampling efficiency due to blockage.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carboxyl nitrile latex reactor sampling structure, characterized in that: include: A reactor body (1), wherein a motor (2) is fixedly mounted on the top of the reactor body (1), a feed pipe (3) is fixedly mounted on the top of the reactor body (1), a stirring blade (4) is fixedly mounted on the output end of the motor (2), and a discharge pipe (5) is fixedly mounted on the bottom of the reactor body (1); A sampling device, the sampling device is arranged on the surface of a reactor body (1), the sampling device comprises an electric telescopic rod (6), a connecting pipe (7), a fixing plate (8), a fixing rod (9), a sealing plate (10), a sampling port (11), a sampling tube (12), an L-shaped slide plate (13) and a limiting plate (14), the electric telescopic rod (6) is fixedly mounted on the outer wall of the reactor body (1), the connecting pipe (7) is fixedly mounted on the surface of the reactor body (1), the fixing plate (8) is fixedly mounted on the output end of the electric telescopic rod (6), the fixing rod (9) is fixedly mounted on a side of the fixing plate (8) close to the reactor body (1), the sealing plate (10) is fixedly mounted on a side of the fixing rod (9) away from the fixing plate (8), the sampling port (11) is fixedly mounted on the bottom of the connecting pipe (7), the sampling tube (12) is arranged on the surface of the sampling port (11), the L-shaped slide plate (13) is slidably mounted on the bottom of the connecting pipe (7), and the limiting plate (14) is fixedly mounted on the bottom of the fixing plate (8); The connecting tube (7) is provided with an anti-residue device for scraping off the inner wall of the connecting tube (7), the anti-residue device comprising an L-shaped push rod (151), a connecting seat (152), a clamping rod (153) and a push block (154), the L-shaped push rod (151) being fixedly mounted on the surface of the fixing plate (8), the connecting seat (152) being fixedly mounted on the circumferential surface of the connecting tube (7), the clamping rod (153) being rotatably mounted on the inner wall of the connecting seat (152), the push block (154) being slidably mounted on the inner wall of the connecting seat (152), and the sampling device being provided with an anti-blocking device comprising a sliding frame (161), a triangular block (162) and a dredging rod ( 163), the sliding frame (161) is slidably mounted on the inner wall of the sampling port (11), the triangular block (162) is fixedly mounted on the top of the sliding frame (161), the dredging rod (163) is fixedly mounted on the bottom of the sliding frame (161), a groove is provided on the surface of the sliding frame (161), a rotating plate (164) is rotatably mounted on the inner wall of the groove, a supporting plate (165) is fixedly mounted on the inner wall of the sampling port (11), an arc plate (166) is slidably mounted on the top of the supporting plate (165), a connecting frame (167) is fixedly mounted on the surface of the arc plate (166), and an end of the rotating plate (164) away from the groove is rotatably mounted on the inner wall of the connecting frame (167); A fixing block (155) is fixedly mounted on the inner wall of the connecting pipe (7); a circular ring (156) is fixedly mounted on a surface of the fixing block (155) away from the inner wall of the connecting pipe (7); a spiral ring (157) is rotatably mounted on the inner wall of the circular ring (156); a spiral groove is formed on the surface of the fixing rod (9); the spiral ring (157) is threadedly connected to the fixing rod (9); and a scraper (158) is fixedly mounted on the surface of the spiral ring (157).

2. The carboxyl nitrile latex reactor sampling structure according to claim 1, characterized in that: A No. 1 spring is provided between the L-shaped slide plate (13) and the connecting tube (7), and the L-shaped slide plate (13) is in contact with the surface of the sampling tube (12).

3. A carboxyl nitrile latex reactor sampling structure according to claim 2, characterized in that: A first torsion spring is arranged between the clamping rod (153) and the connecting seat (152), and the push block (154) is arranged above the clamping rod (153).

4. The carboxyl nitrile latex reactor sampling structure according to claim 3, characterized in that: A No. 2 spring is provided between the sliding frame (161) and the sampling port (11), and a No. 3 spring is provided between the support plate (165) and the arc plate (166).

Images