Liquid crystal polymer sampling device

Abstract

The utility model relates to a liquid crystal polymer sampling device and belongs to the technical field of industrial online sampling detection. The sampling device comprises a sampling valve and an air cylinder, the sampling valve comprises a valve body, a valve element and a valve rod, the valve rod of the sampling valve is fixedly connected with a piston rod of the air cylinder, an opening is formed in the end of the inner side of the valve body, the valve element is connected into the valve body in a sliding mode and provided with a sampling groove, and the outer side end of the valve element is connected with the valve rod. The inner side end can penetrate out of the opening of the inner side end of the valve body. The sampling device designed by the utility model can realize on-line sampling of liquid crystal polymer production, and is convenient to apply.

Description

Technical Field

[0001] The utility model relates to the technical field of online sampling and detection of industrial production, in particular to a sampling device for liquid crystal polymers. Background Art

[0002] In industrial production, online material sampling according to process requirements is of great significance for optimizing production processes and controlling product quality. Online sampling devices for liquid materials are widely used, while online sampling of solid materials is less used in production.

[0003] The existing automatic sampling devices for solid materials are mostly implemented in the form of spiral auger. When the auger rotates forward, the material is taken from the reaction device and transported to the sampling bottle; when the auger rotates reversely, the material remaining in the auger is returned to the reaction device.

[0004] Since the auger is a mechanical rotating device, it is impossible to achieve a good seal. When the gas in the reaction device is not allowed to leak or an oxygen-free environment is required, the application of this type of device is limited. In addition, the auger sampling method is not suitable for high-temperature environments, and it is also not applicable when the temperature in the reactor is high.

[0005] The existing patent CN2655219Y discloses a negative pressure type granular material sampling device, which inserts a retractable sampling tube into the device for sampling, and retracts it after sampling to transfer the sample through a negative pressure environment. Due to the poor fluidity of solid materials, large particles are prone to jamming during the sampling process, affecting the normal retractable action of the sampling tube. At the same time, after sampling, it is necessary to rely on a negative pressure environment to transfer the sample material, which has a high operating cost, and the sample material is prone to residual accumulation in the sampling tube. Summary of the invention

[0006] In order to solve the problems in the prior art, the utility model patent designs a liquid crystal polymer sampling device to solve the problems that the existing online sampling device is prone to jamming and sample material is prone to residual accumulation.

[0007] The technical solution adopted by the utility model is: the sampling device includes a horizontally placed sampling valve and a power mechanism, the sampling valve includes a valve body, a valve core and a valve stem, the valve stem of the sampling valve is connected and fixed to the power mechanism, the front end of the valve body is open and connected and fixed to the production device, the valve core is slidably connected in the cavity of the valve body, a sampling groove is provided on the valve core, the rear end of the valve core is connected to the valve stem, and the front end can pass through the opening at the front end of the valve body.

[0008] Furthermore, a connecting flange is provided at the front end of the valve body, which is connected to the sampling port of the production device through the connecting flange. An air sealing hole is radially opened on the upper side of the connecting flange. The outer end pipeline of the air sealing hole is connected to the air sealing gas source, and the inner end of the air sealing hole is connected to the internal cavity of the valve body.

[0009] Furthermore, a purge pipe is provided along one side of the valve stem of the sampling valve, the inner end of the purge pipe is connected to the sampling slot of the valve core, and the outer end of the purge pipe is connected to the purge gas source.

[0010] Furthermore, a valve body connecting sleeve is welded to the bottom side of the middle part of the valve body, the connecting sleeve is connected to the internal cavity of the valve body, and the bottom end of the connecting sleeve is connected to the sampling bottle.

[0011] Furthermore, the sampling groove is arranged in the middle part of the valve core and penetrates up and down. The front bottom surface of the sampling groove is an inclined surface. When the valve core extends forward to the valve body, the upper opening of the sampling groove is located on the outside of the valve body, and the bottom opening is still completely located in the valve body. When the valve core is retracted backward into the valve body, the bottom opening of the sampling groove is aligned with the valve body connecting sleeve.

[0012] Furthermore, the front end of the sampling slot is triangular.

[0013] Furthermore, the opening angle of the front end of the upper opening of the sampling slot is 60 degrees.

[0014] Furthermore, the internal cavity of the valve body is cylindrical, the valve core is cylindrical with the same size as the internal cavity of the valve body, and a first sealing ring is circumferentially arranged at the front end of the valve core.

[0015] Furthermore, the outer surface of the valve core is provided with a second sealing ring and a third sealing ring along the circumferential direction at the front and rear sides of the sampling groove respectively.

[0016] Furthermore, the power mechanism is a low-speed cylinder using SMC and is equipped with a speed regulator, and the end of the piston rod of the cylinder is connected and fixed to the end of the valve stem.

[0017] Compared with the prior art, the advancement of the liquid crystal polymer sampling device designed in the utility model patent is:

[0018] The sampling valve has a sampling slot that penetrates through the valve core. When the valve core is extended, the material falling from the production device can automatically fall into the sampling slot. After the valve body is recovered, the material in the sampling slot can automatically fall into the connecting sleeve at the bottom of the valve body and finally enter the sampling bottle. The sample material transfer is convenient during the sampling process.

[0019] The front end of the sampling slot adopts a triangular design. During the valve core recovery process, the line cutting between it and the valve body is changed to point cutting, which can effectively avoid the blockage of solid particles.

[0020] The power mechanism of the sampling device adopts SMC's low-speed cylinder and is equipped with a speed regulator to control the extension and retraction speed of the valve core, further reducing the risk of jamming.

[0021] An air sealing hole is arranged on the upper part of the connecting flange of the valve body, and the air sealing hole pipeline is connected to the air sealing gas source to form an air seal between the first sealing ring and the second sealing ring of the valve body to prevent air from entering the sampling tank and the production device.

[0022] The sampling valve is provided with a purge pipe connected to the sampling slot of the valve core, through which purge gas can be introduced. When the valve core is recovered, the triangular end area at the front end of the sampling slot can be emptied to avoid jamming during the reset process. After the valve core is completely reset, the purge pipe sprays twice intermittently to completely remove the material in the sampling slot to ensure that there is no sample residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the front view structure of the sampling device of liquid crystal polymer.

[0024] Figure 2 It is a schematic diagram of the structure of the sampling valve of the sampling device of liquid crystal polymer.

[0025] Figure 3 It is a schematic diagram of the top view structure of the valve core.

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the valve core.

[0027] In the figure, 1 is a valve body, 2 is a valve core, 3 is a valve stem, 4 is a connecting flange, 5 is a connecting sleeve, 6 is a purge pipe, 7 is a cylinder, 8 is a connecting pipe, 9 is a sampling bottle, 11 is a cover plate, 21 is a sampling slot, 22 is a valve core cover, 23 is a first sealing ring, 24 is a second sealing ring, 25 is a third sealing ring, 41 is an air sealing hole, 42 is an air sealing gas source, 61 is a jacket, and 62 is a purge gas source. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the utility model are clearly and completely described, and the described embodiments are only embodiments of a part of the invention, not all of it. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0029] like Figures 1 to 4As shown, the utility model patent designs an embodiment of a sampling device for liquid crystal polymers. In this embodiment, the sampling device includes a horizontally placed sampling valve and a cylinder 7. The sampling valve includes a valve body 1, a valve core 2 and a valve stem 3. The interior of the valve body 1 is a cylindrical cavity. The valve core 2 is a cylindrical structure of the same size as the internal cavity of the valve body 1. The valve core 2 is slidably connected in the cavity of the valve body 1. The front end of the valve body 1 is open, and the front end of the valve core 2 can pass through the opening of the front end of the valve body 1. The front end of the valve core 2 is provided with a valve core cover 22. The rear end of the valve core 2 is connected to the valve stem 3, and the rear end of the valve body 1 is connected to the cover plate 11. The valve stem 1 passes through the through hole of the cover plate 11, and the end is connected and fixed to the piston rod of the cylinder 6.

[0030] A connecting flange 4 is provided on the outer periphery of the front side end of the valve body 1, and is butt-connected and installed at the sampling port of the production device through the connecting flange 4. A gas sealing hole 41 is radially opened on the upper part of the connecting flange 4, and a ferrule joint is provided on the outer end of the gas sealing hole 41, which is connected to a gas sealing gas source 42 through a pipeline, and the inner end of the gas sealing hole 41 is connected to the internal cavity of the valve body 1.

[0031] The middle bottom side of the valve body 1 is open and welded with a valve body connecting sleeve 5, which is connected to the internal cavity of the valve body 1. The bottom end of the connecting sleeve 5 is connected to a connecting pipe 8 through a flange, and the bottom end of the connecting pipe 8 is connected to a sampling bottle 9.

[0032] A sampling groove 21 is provided in the middle of the valve core 2, and the sampling groove 21 vertically penetrates the valve core 2. The front bottom surface of the sampling groove 21 is an inclined structure, so that the upper opening and the bottom opening are vertically staggered, and the front end of the upper opening is triangular, and the opening angle is 60 degrees. When the valve core 2 extends forward from the valve body 1, the upper opening of the sampling groove 21 is located on the outside of the valve body 1, and the bottom opening is still completely located in the valve body 1. When the valve core 2 is recovered backward into the valve body 1, the bottom opening of the sampling groove 21 is aligned with the opening of the connecting sleeve 5 on the lower side of the valve body 1. Three sealing ring fixing grooves are opened along the circumference of the outer surface of the valve core 2, wherein the first sealing ring 23 is circumferentially arranged in the fixing groove located at the front end of the valve core 2, and the second sealing ring 24 and the third sealing ring 25 are circumferentially arranged in the fixing grooves on the front and rear sides of the sampling groove 21 section, respectively, and the three sealing rings are made of perfluoroether rubber.

[0033] In addition, a purge pipe 6 is provided along one side of the valve stem 3 of the sampling valve, and the purge pipe 6 is connected and fixed to the valve stem 3 through a jacket 61, and its inner end is connected to the sampling slot 21 inside the valve core 2, and a ferrule joint is also provided at the outer end, and the purge gas source 62 is connected through a pipeline. In this embodiment, the gas sealing gas source 42 and the purge gas source 62 are connected to the same nitrogen gas source, and the connecting pipelines of the two are respectively provided with solenoid valves for switch control.

[0034] The cylinder 7 is a low-speed cylinder from SMC and is equipped with a speed regulator, which can effectively control the moving speed of the valve core 2.

[0035] When the sampling device for liquid crystal polymer disclosed in the utility model patent is used, the sampling bottle 9 is first connected to the connecting pipe 8 at the lower end of the connecting sleeve 5 of the valve body 1. When the piston rod of the cylinder 7 is retracted, the valve core 2 is completely located inside the valve body 1, and the valve body is inflated through the air sealing hole 4, and the space between the second sealing ring 24 and the first sealing ring 23 is filled with nitrogen, which plays a role of nitrogen sealing. When sampling is required, the cylinder 7 is powered and starts to move, and the valve core 2 is pushed through the sampling port into the reactor through the valve stem 3. Within the set time, the falling material fills the sampling slot 21 inside the valve core 2, which is about 130ml. After that, the cylinder 7 contracts, the valve core 2 starts to retreat, and at the same time, the purge gas source 62 blows air through the purge pipe 6. The compressed gas blown out by the purge pipe 6 clears the material at the front triangular end of the sampling slot 21 to prevent the valve core 2 from getting stuck when entering the valve body 1. After the valve core 2 enters the interior of the valve body, the purge gas source is closed and the spraying stops. The material begins to enter the sampling bottle 9 through the bottom opening of the sampling slot 21 and the connecting sleeve 5. After the valve core 2 is fully reset, most of the material will enter the lower connected sampling bottle 9. The purge gas source 62 is started to spray intermittently twice, so that the remaining material in the sampling slot 21 completely enters the sampling bottle.

[0036] The above contents are only preferred embodiments of the present invention and cannot be used to limit the scope of implementation of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A sampling device for liquid crystal polymer, characterized in that: The sampling device includes a horizontally placed sampling valve and a power mechanism. The sampling valve includes a valve body, a valve core and a valve stem. The valve stem of the sampling valve is connected and fixed to the power mechanism. The front end of the valve body is open and connected and fixed to the production device. The valve core is slidably connected in the cavity of the valve body. A sampling groove is provided on the valve core. The rear end of the valve core is connected to the valve stem, and the front end of the valve core can pass through the opening at the front end of the valve body.

2. A liquid crystal polymer sampling device according to claim 1, characterized in that: A connecting flange is provided at the front end of the valve body, which is connected to the sampling port of the production device through the connecting flange. An air sealing hole is radially opened on the upper side of the connecting flange. The outer end pipeline of the air sealing hole is connected to the air sealing gas source, and the inner end of the air sealing hole is connected to the internal cavity of the valve body.

3. A liquid crystal polymer sampling device according to claim 2, characterized in that: The sampling valve is provided with a purge pipe along one side of the valve stem, the inner end of the purge pipe is connected to the sampling slot of the valve core, and the outer end of the purge pipe is connected to the purge gas source.

4. A liquid crystal polymer sampling device according to claim 3, characterized in that: A valve body connecting sleeve is welded on the bottom side of the middle part of the valve body. The connecting sleeve is communicated with the internal cavity of the valve body, and the bottom end of the connecting sleeve is connected to the sampling bottle.

5. A liquid crystal polymer sampling device according to claim 4, characterized in that: The sampling groove is arranged in the middle part of the valve core and penetrates up and down. The front part of the sampling groove is an inclined surface. When the valve core extends forward to the valve body, the upper opening of the sampling groove is located on the outside of the valve body, and the bottom opening is still completely located in the valve body. When the valve core is recovered backward into the valve body, the bottom opening of the sampling groove is aligned with the connecting sleeve of the valve body.

6. A liquid crystal polymer sampling device according to claim 5, characterized in that: The front end of the sampling slot is triangular.

7. A liquid crystal polymer sampling device according to claim 6, characterized in that: The opening angle of the front end of the upper opening of the sampling slot is 60 degrees.

8. The liquid crystal polymer sampling device according to claim 7, characterized in that: The inner cavity of the valve body is cylindrical, the valve core is cylindrical with the same size as the inner cavity of the valve body, and a first sealing ring is circumferentially arranged at the front end of the valve core.

9. The sampling device of liquid crystal polymer according to claim 8, characterized in that: The outer surface of the valve core is provided with a second sealing ring and a third sealing ring along the circumferential direction at the front and rear sides of the sampling groove respectively.

10. The liquid crystal polymer sampling device according to claim 9, characterized in that: The power mechanism is a low-speed cylinder made of SMC and is equipped with a speed regulator. The end of the piston rod of the cylinder is connected and fixed to the end of the valve stem.

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