An automatic powder sampling machine

Abstract

The application relates to the technical field of PTA equipment, in particular to an automatic powder sampling machine, which comprises a main pipeline used for powder production and conveying; a supporting frame arranged on the main pipeline; a sampling mechanism slidably connected to the supporting frame, one end of the sampling mechanism being communicated with the main pipeline, the sampling mechanism being used for externally outputting the powder in the main pipeline; a driving mechanism arranged on the supporting frame and used for slidingly driving the sampling mechanism on the supporting frame; and a hopper arranged on the main pipeline, the supporting frame or the sampling mechanism and used for receiving the powder output by the sampling mechanism. The automatic powder sampling device obtained by the application can realize automatic sampling in the main pipeline, and will not cause blockage in the main pipeline after sampling is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PTA equipment, and in particular to an automatic powder sampling machine. BACKGROUND

[0002] After PTA is dried to form finished powder, sampling analysis needs to be performed before entering the finished material bin to detect whether various indexes of the finished PTA powder are qualified. Since sampling is performed manually, it is difficult to ensure appropriate sampling amount during the sampling process, and the sampled powder is also easily polluted by the external environment, so the sampled sample has poor representativeness. Manual cost is high, and efficiency is low. In addition, during the sampling process, the discharge pipeline is easily blocked, and improper operation easily causes dust emission, which pollutes the environment.

[0003] The current conventional method is to set a manual switch discharge ball valve on the PTA discharge pipeline, and a union joint is arranged after the switch ball valve. A sealed sampling container is used by a sampling personnel to connect the union joint, and then the ball valve is opened to perform sampling. After a certain sampling time, the ball valve is closed. The sampling amount is entirely dependent on experience and feeling. Since there is a certain dead zone between the ball valve and the flange connection, the sampled sample is often the sample of the previous time period. Therefore, the on-site operator often needs to discharge a little old material first, and then can take a representative sample, which is very labor-intensive. During the sampling process, the sampling site powder is often scattered, the discharged powder product is also wasted to a certain extent, and the environment is polluted.

[0004] For example, a new automatic sampling device in Chinese utility model patent CN202121918218.7 includes a powder conveying pipeline and a sampling pipe. A remote control electromagnetic valve and a check valve are arranged on the sampling pipe. A baffle is arranged on one side of the sampling pipe. A settling chamber is arranged below the baffle. The settling chamber is connected to a discharge port through a ball valve.

[0005] The technical scheme has the above technical problems, so there is an urgent need for a powder sampling device that can solve the above technical problems. SUMMARY

[0006] The present application provides an automatic powder sampling device to solve the above technical problems. The device can automatically sample powder in the main pipeline and exit the main pipeline when not sampling to avoid blocking the main pipeline.

[0007] The application discloses an automatic powder sampling device, which comprises a main pipeline for powder production and conveying; a supporting frame arranged on the main pipeline; a sampling mechanism slidably connected to the supporting frame, one end of the sampling mechanism being communicated with the main pipeline, the sampling mechanism being used for outputting the powder in the main pipeline to the outside, a driving mechanism arranged on the supporting frame and used for driving the sampling mechanism to slide on the supporting frame, and a hopper arranged on the main pipeline, the supporting frame or the sampling mechanism and used for receiving the powder output by the sampling mechanism.

[0008] In the above scheme, the sampling mechanism and the main pipeline are in sealed connection, the driving mechanism drives the sampling mechanism to move, when sampling, the sampling mechanism enters the main pipeline, samples the powder, and conveys the powder to the hopper, and after sampling is completed, the sampling mechanism exits the main pipeline, so that the normal conveying of the powder in the main pipeline is ensured, and the main pipeline is not prone to blockage.

[0009] The sampling mechanism is structured as follows: a branch flange is arranged on the main pipeline and communicated with the inside of the main pipeline, the supporting frame is fixed on the branch flange, a transmission support is slidably connected in the supporting frame, a shell pipe is arranged on the transmission support, the two ends of the shell pipe are closed, a spiral blade assembly is arranged in the shell pipe, the shaft body of the spiral blade assembly extends outward from the center of the end of the shell pipe to the transmission support, the shell pipe away from the transmission support extends into the inside of the branch flange, the shell pipe and the inner wall of the branch flange are in sealed connection and are slidably connected in the axial direction, a sampling head is arranged at the end of the shell pipe in the inside of the branch flange, a sampling port is arranged on the circumferential surface of the end of the shell pipe in the inside of the branch flange, a motor is arranged on the transmission support and in transmission connection between the shaft body of the spiral blade assembly in the transmission support and the motor, and the hopper is communicated with the shell pipe through a pipeline.

[0010] The shell pipe and the branch flange of the sampling mechanism are in sealed connection, so that the shell pipe is in a sealed state after moving into the main pipeline, the sampling head can loosen the powder in the main pipeline, the powder enters the sampling port after the sampling port moves into the main pipeline, in the rotating process of the spiral blade assembly, the powder is conveyed to the joint of the shell pipe and the hopper and falls into the hopper, and the closed sampling is realized; after sampling is completed, the driving mechanism draws out the shell pipe, so that the sampling head, the sampling port and the like are all located in the inside of the branch flange, so that no interference is caused to the inside of the main pipeline, and the conveying of the powder in the main pipeline is normal.

[0011] As optimization, a guide rod is arranged on the transmission support at the two sides of the shell pipe, a guide groove is arranged on the supporting frame corresponding to the guide rod, the guide rod is located in the guide groove, and the movement direction of the guide rod in the guide groove is consistent with the axial direction of the shell pipe. The structure can make the movement direction of the shell pipe more stable, so that the sealing between the shell pipe and the branch flange is more reliable.

[0012] As optimization, the driving mechanism comprises a piston pneumatic actuator and a connecting piece, the piston pneumatic actuator is provided with a push rod, the push rod is connected with the transmission support through the connecting piece, and the axial direction of the push rod is parallel to the axial direction of the shell pipe. The piston pneumatic actuator can be a cylinder, the push rod is a component of the cylinder, and of course, a gas circuit control system is further included for controlling the movement state of the piston pneumatic actuator, i.e. moving, stopping, moving position, etc. of the push rod. The gas circuit control system can generally be remote control.

[0013] As optimization, the hopper is a closed mixing hopper, the closed mixing hopper is fixed on the main pipeline through a cable-stayed support, the closed mixing hopper is communicated with the shell pipe through a discharge hose, and a discharge valve is arranged at the bottom of the closed mixing hopper; and a pressure gauge is arranged on the closed mixing hopper. The closed mixing hopper has a hollow inverted cone structure, is fixed on the main pipeline, and is connected with the shell pipe through the discharge hose, so that the movement of the shell pipe does not interfere with the closed mixing hopper, and the shell pipe can be moved multiple times to the closed mixing hopper, and the sampling of the powder is more uniform and reliable.

[0014] As optimization, a back blowing mechanism is arranged on the sampling mechanism, the back blowing mechanism comprises a blowing electromagnetic valve, a pressure reducing valve and a blowing hose, one end of the blowing hose is connected to the shell pipe away from the main pipeline, the other end of the blowing hose is used for connecting a high-pressure gas source, and the pressure reducing valve and the blowing electromagnetic valve are arranged on the blowing hose. Before each sampling, during the movement of the shell pipe and the entry of the sampling port into the main pipeline, the blowing electromagnetic valve is opened, high-pressure gas enters the shell pipe, and is blown out from the sampling port, so that the residual powder in the shell pipe is blown out into the main pipeline, and after a certain blowing time, the blowing electromagnetic valve is closed. The spiral blade assembly is rotated to realize sampling of the powder, ensure that the sampled powder is new powder in the main pipeline, and ensure the accuracy of subsequent detection of the powder.

[0015] As optimization, the sealing structure between the branch pipe flange and the shell pipe is that a sealing seat is arranged in the branch pipe flange, the sealing seat also has a flange structure, the end of the sealing seat is sealed with the end of the branch pipe flange through a front end sealing gasket, a packing gland is arranged in the sealing seat, the packing gland is fixed on the sealing seat through bolts, an annular packing chamber is formed between the packing gland and the inner wall of the sealing seat, sealing packing is arranged in the packing chamber, the shell pipe penetrates through the packing gland and the sealing seat, and the sealing packing is in contact with the outer wall of the shell pipe.

[0016] As optimization, the sealing structure between the shaft body of the helical blade assembly and the shell pipe is that a pipe body is arranged on the transmission support, the pipe body is butted with the shell pipe, flange structures are connected on the pipe body and the shell pipe at the butting position of the pipe body and the shell pipe, a rear end sealing gasket and a positioning ring are arranged in the flange structure, the positioning ring and the inner wall of the pipe body form a shaft seal cavity, a shaft seal ring is arranged in the shaft seal cavity, the shaft body of the helical blade assembly extends from the shell pipe, passes through the pipe body and enters the transmission support, and the shaft seal ring is in contact with the shaft body.

[0017] As optimization, the sampling head is in the shape of a chisel head, and the length direction of the flat end of the chisel head structure of the sampling head is arranged along the axial direction of the main pipeline. The chisel head structure is an existing structure, and details are not described herein. The large diameter of the round head column part of the sampling head is greater than the outer diameter of the shell pipe, the large diameter is greater than the inner diameter of the sealing seat, and the large diameter is smaller than the inner diameter of the branch pipe flange. Therefore, after the sampling head is withdrawn to the branch pipe flange, the end part of the sampling head is in contact with the end part of the sealing seat.

[0018] As optimization, two stroke detection sensors are arranged on the support frame at the guide groove, and the stroke detection sensors are used to sense the moving position of the guide rod in the guide groove. The stroke detection sensors are connected with the gas circuit control system, and the piston type pneumatic actuator limits the moving position of the guide rod in the guide groove during driving the movement of the transmission support and the shell pipe, that is, the moving range of the shell pipe can be limited. Finally, the sampling port is moved to the relatively middle part of the main pipeline during sampling, and the sampling head and the like are all withdrawn into the branch pipe flange after sampling is completed.

[0019] Working principle: when sampling is needed, a sampling signal is issued, and the control gas path system pushes the push rod in the direction of the main pipeline after receiving the sampling signal, and the push rod drives the sampling mechanism to advance; at the same time, the back blowing mechanism starts to work, the blow cleaning electromagnetic valve opens, high pressure nitrogen gas enters the shell pipe through the pressure reducing valve and the blow cleaning electromagnetic valve, and the residual material in the shell pipe is blown into the main pipeline through the spiral blade assembly. At this time, the powder around the sampling head will be blown away, and the sampling head can quickly reach the center position of the main pipeline under the action of the broken wall type force of the chisel head structure sampling head; after the travel detection sensor detects that the sampling mechanism advances to the position through the guide rod, the back blowing mechanism stops working, and the motor starts to run. The powder in the main pipeline is affected by the powder conveying force and enters the sampling port, and the spiral blade assembly rotates under the drive of the motor. The spiral blade assembly transmits the powder to the discharge port, that is, the connection between the discharge hose and the shell pipe, and the powder falls into the closed mixing hopper through the discharge hose under the action of gravity; after the sampling amount reaches the required amount, a sampling stop signal is issued, and the push rod drives the sampling mechanism to retreat in the direction of the piston type pneumatic actuator after receiving the stop sampling signal. At the same time, the blow cleaning system starts to work again to clean the powder in the shell pipe; after the travel detection sensor detects that the sampling mechanism retreats to the position through the guide rod, the motor and the back blowing mechanism stop working. The sampling work signal can be set according to the needs of single time period sampling or multiple time period mixed sampling, so as to realize full automatic sampling. When the powder needs to be taken out for analysis, the operator puts the sample bag against the discharge valve, and then opens the discharge valve, so that the powder can be loaded into the sample bag; because the sampling head is attached to the sealing seat, the powder and gas pressure in the main pipeline will not enter the shell pipe. When the discharge valve is opened, the pressure in the closed mixing hopper will quickly decrease to a safe value, which can be observed through the pressure gauge, so as to avoid the problem of dust during sampling and achieve the effect of safety and environmental protection.

[0020] The automatic powder sampling device obtained by the application can realize automatic sampling in the main pipeline and will not cause blockage in the main pipeline after sampling is completed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure of the application is shown in the figure Figure 1 ;

[0022] Figure 2 The structure of the application is shown in the figure Figure 2 ;

[0023] Figure 3 The local sectional view of the automatic powder sampling device of the application is shown in the figure

[0024] Figure 4 The structure of the shell pipe of the application is shown in the figure

[0025] Figure 5 This is an exploded schematic diagram of the sampling mechanism of the present invention;

[0026] Figure 6 This is a schematic diagram of the mating structure of the sealing seat and the packing gland of the present invention;

[0027] Figure 7 This is a schematic diagram of the connection structure between the shell tube and the transmission support of the present invention.

[0028] Numbering in the diagram: 1 Main pipe, 2 Sampling mechanism, 21 Shell pipe, 24 Motor, 25 Spiral blade assembly, 26 Shaft, 27 Sampling head, 28 Anti-loosening screw, 29 Branch flange, 211 Discharge port, 212 Purge port, 213 Sampling port, 214 Front positioning groove, 221 Stuffing gland, 222 Sealing packing, 223 Stuffing gland, 224 Sealing seat, 225 Front sealing gasket, 231 Rear positioning groove, 232 Rear sealing gasket, 233 Positioning block, 2 34 Shaft seal ring, 235 Shaft seal box, 236 Tube body, 3 Drive mechanism, 31 Piston pneumatic actuator, 32 Control air circuit system, 33 Support frame, 34 Push rod, 35 Connector, 36 Transmission bracket, 37 Guide rod, 38 Stroke detection sensor, 39 Guide groove, 41 Sealed mixing hopper, 42 Inclined support, 43 Discharge hose, 44 Discharge valve, 45 Pressure gauge, 5 Backflush mechanism, 51 Purge solenoid valve, 52 Purge hose, 53 Pressure reducing valve. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0030] Example 1:

[0031] like Figure 1 As shown, this invention discloses an automatic powder sampling device, including a main pipeline 1 for conveying powder production; a support frame 33 mounted on the main pipeline 1, with a sampling mechanism 2 slidably connected to the support frame 33, one end of which is connected to the main pipeline 1, and the sampling mechanism 2 is used to output the powder inside the main pipeline 1 to the outside; a driving mechanism 3 is mounted on the support frame 33, and the driving mechanism 3 is used to drive the sampling mechanism 2 to slide on the support frame 33; and a hopper is mounted on the main pipeline 1, the support frame 33, or the sampling mechanism 2, and the hopper is used to receive the powder output by the sampling mechanism 2.

[0032] The structure of the sampling mechanism 2 is that a branch flange 29 is arranged on the main pipeline 1, the branch flange 29 is communicated with the inside of the main pipeline 1, the support frame 33 is fixed on the branch flange 29, the transmission support 36 is slidingly connected in the support frame 33, a shell pipe 21 is arranged on the transmission support 36, the two ends of the shell pipe 21 are closed, the helical blade assembly 25 is arranged in the shell pipe 21, the shaft body 26 of the helical blade assembly 25 extends outward from the center of the end of the shell pipe 21 into the transmission support 36, the shell pipe 21 away from the transmission support 36 extends into the inside of the branch flange, the shell pipe 21 is sealed with the inner wall of the branch flange 29 and is slidingly connected in the axial direction, the sampling head 27 is arranged on the end of the shell pipe 21 in the inside of the branch flange 29, the sampling port 213 is arranged on the circumferential surface of the end of the shell pipe 21 in the inside of the branch flange 29, the motor 24 is arranged on the transmission support 36, and the motor 24 is drivingly connected between the shaft body 26 of the helical blade assembly 25 and the transmission support 36; the hopper is communicated with the discharge port 211 on the shell pipe 21 through a pipeline.

[0033] The guide rods 37 are arranged on the transmission supports 36 on the two sides of the shell pipe 21, the guide grooves 39 are arranged on the support frames 33 corresponding to the guide rods 37, the guide rods 37 are located in the guide grooves 39, and the movement direction of the guide rods 37 in the guide grooves 39 is consistent with the axial direction of the shell pipe 21.

[0034] The driving mechanism 3 comprises a piston pneumatic actuator 31 and a connecting piece 35, the push rod 34 is arranged on the piston pneumatic actuator 31, the push rod 34 is connected with the transmission support 36 through the connecting piece 35, and the axial direction of the push rod 34 is parallel to the axial direction of the shell pipe 21. The gas path control system is further arranged, and the gas path control system controls the action of the piston pneumatic actuator 31.

[0035] The hopper is a closed mixing hopper 41, the closed mixing hopper 41 is fixed on the main pipeline 1 through the inclined support 42, the inclined support 42 is fixed on the main pipeline 1 directly below the shell pipe 21, the closed mixing hopper 41 is communicated with the shell pipe 21 through the discharge hose 43, and the discharge valve 44 is arranged at the bottom of the closed mixing hopper 41; the pressure gauge 45 is arranged on the closed mixing hopper 41.

[0036] The blowback mechanism 5 is arranged on the sampling mechanism 2, the blowback mechanism 5 comprises a blowback electromagnetic valve 51, a pressure reducing valve 53 and a blowback hose 52, one end of the blowback hose 52 is connected to the blowback port 212 on the shell pipe 21 away from the main pipeline 1, the other end of the blowback hose 52 is used for connecting a high-pressure gas source, and the pressure reducing valve 53 and the blowback electromagnetic valve 51 are arranged on the blowback hose 52.

[0037] The sealing structure between the branch flange 29 and the shell pipe 21 is that a sealing seat 224 is arranged inside the branch flange 29, the sealing seat 224 is also a flange structure, the end of the sealing seat 224 is sealed with the end of the branch flange 29 by a front end sealing gasket 225, a packing gland 223 is arranged inside the sealing seat 224, the packing gland 223 is fixed on the sealing seat 224 by bolts, the packing gland 223 and the inner wall of the sealing seat 224 form an annular packing chamber 221, the sealing packing 222 is arranged in the packing chamber 221, the shell pipe 21 passes through the packing gland 223 and the sealing seat 224, and the sealing packing 222 contacts the outer wall of the shell pipe 21. The packing chamber 221 is an annular groove for installing the sealing packing 222.

[0038] The sealing structure between the shaft body 26 of the spiral blade assembly 25 and the shell pipe 21 is that a pipe body 236 is arranged on the transmission support 36, the pipe body 236 is butted with the shell pipe 21, the pipe body 236 and the shell pipe 21 are connected by flange structures at the butt joint position, a front positioning groove 214 is arranged on the flange structure on the shell pipe 21, a rear positioning groove 231 is arranged on the flange structure on the pipe body 236, a rear end sealing gasket 232 and a positioning ring are arranged in the front positioning groove 214 and the rear positioning groove 231, the positioning ring and the inner wall of the pipe body 236 form a shaft seal chamber 235, a shaft seal ring 234 is arranged in the shaft seal chamber 235, the shaft body 26 of the spiral blade assembly 25 extends from the shell pipe 21, passes through the pipe body 236 and enters the transmission support 36, and the shaft seal ring 234 contacts the shaft body 26. The shaft seal chamber 235 is an annular groove for installing the shaft seal ring 234.

[0039] The sampling head 27 is a chisel head structure, and the length direction of the flat end of the chisel head structure of the sampling head 27 is arranged along the axial direction of the main pipeline 1.

[0040] Two stroke detection sensors 38 are arranged on the support frame 33 at the guide groove 39, and the stroke detection sensors 38 are used to sense the moving position of the guide rod 37 in the guide groove 39.

[0041] In the specific implementation process, as Figure 1 and Figure 3As shown, for concentricity, the inner diameter of the branch flange 29 is equal to the outer diameter of the sealing seat 224 located in the inner part of the branch flange 29; the flange is provided with two circles of bolt holes inside and outside to meet the connection of the outer circle of bolt holes with the support frame 33; the inner circle of bolt holes is matched with the flange of the sealing seat 224; in order to realize that the sampling head 27 is hidden in the branch flange 29 when the sampling device is not working, without affecting the flow of powder in the main pipeline 1, the overall length of the branch flange 29 is equal to or slightly greater than the sum of the length of the sampling head 27 and the length of the sealing seat 224 located in the inner part of the branch flange 29.

[0042] In the specific implementation process, as shown in Figure 3 and Figure 6 , the sealing seat 224 is arranged in the branch flange 29, and the packing gland 221 is arranged in the sealing seat 224; in order to prevent metal from being bitten by metal, the inner diameter of the sealing seat 224 has a certain safety clearance with the outer wall of the shell tube 21; the sealing seat 224 is the base of the packing gland 221; in order to prevent the powder in the main pipeline 1 from leaking, the sealing packing 222 must be installed in the inside of the packing gland 221, and the sealing packing 222 must be matched with the shell tube 21; the flange surface of the sealing seat 224 is provided with two circles of bolt holes inside and outside, the outer circle of bolt holes is connected with the branch flange 29 through bolts, and the inner circle has two threaded bolt holes, which are connected with the packing gland 223 through bolts; the size of the packing gland 223 is matched with the packing gland 221 and the shell tube 21 to ensure that the sealing packing can be compacted and the sealing effect of the sealing packing is guaranteed.

[0043] In the specific implementation process, as shown in Figure 5As shown, in order to reduce the resistance of the powder to the sampling head 27, avoid jamming, the sampling head 27 is a cylindrical chisel head structure; in consideration of the need for guidance and sealing, the large diameter of the sampling head 27 is larger than the outer diameter of the shell pipe 21, and the large diameter is smaller than the inner diameter of the branch pipe flange 29; in order to improve the concentricity of the sampling head 27 and the pipe section of the shell pipe 21, and the transition between them is good, avoid jamming, a positioning groove is arranged at the center position of the small diameter end face of the sampling head 27, which can be consistent with the plug of the shell pipe 21 pipe section; the large diameter of the sampling head 27 is connected with the small diameter through chamfer, so that a part of the chamfer can enter the inside of the sealing seat 224, so that the chamfer will be in contact with the sealing seat 224, thereby achieving the effect of sealing; the sampling head 27 chisel head part circumferential array 4 full penetration bolt hole, in order to reduce the influence of the powder on the anti-loose screw 28 when the sampling head 27 is deeply inserted into the main pipeline 1, reduce the flow resistance, the bolt hole is a countersunk head structure, and the bolt hole is completely matched with the anti-loose screw 28, and the narrow side of the sampling head 27 chisel head part faces the powder flow direction.

[0044] In the specific implementation process, such as Figure 2 、 Figure 3 and Figure 4As shown, the shell pipe 21 is a long neck flange structure; in order to ensure the strength and linkage degree and reduce the inner leakage, the shell pipe 21 pipe end is closed, and a blind plate with sufficient thickness is used for blind plugging, the blind plate is integrated with the shell pipe 21 through threaded connection and full welding, and the outer side of the blind plate is provided with four non-porous threaded holes, the four threaded holes are distributed identically with the bolt holes of the sampling head 27, and the four threaded holes are matched with the anti-loosening screws 28; the end surface of the blind plate is provided with a positioning plug matched with the positioning groove of the sampling head 27; in order to prevent the outer wall of the shell pipe 21 from rubbing against the sealing seat 224, the diameter of the shell pipe 21 pipe end is slightly smaller than the diameter of the shell pipe 21; under the premise of comprehensively considering the strength and sampling amount of the shell pipe 21, a square sampling port 213 is opened on the single side of the end, the diagonal length of the square is equal to the inner diameter of the shell pipe 21, and one side line of the sampling port 213 is close to the blind plate; the flange surface of the shell pipe 21 is provided with the front positioning groove 214; the front positioning groove 214 is matched with the positioning surface of the positioning block 233, so that the positioning block 233 can accurately find the concentricity of the whole sampler; at the same time, in order to prevent the shell pipe 21 from remaining residual material and ensure the freshness of the sampling, the blowback mechanism 5 is arranged, the blowback port 212 is located on the side of the shell pipe 21 away from the main pipeline 1, and the blowback port 212 is a 1 / 4''NPT internal thread structure; the flange thickness of the shell pipe 21 meets the processing strength requirement of the blowback port 212, and the inner diameter of the flange of the shell pipe 21 is matched with the front end part of the positioning block 233; in order to reduce the weight of the whole sampling mechanism 2, improve the service life of the sealing packing, and ensure smooth discharging, the discharging port 211 is designed as a threaded pipe port, the pipe diameter of the discharging port 211 is identical with the pipe section of the shell pipe 21, and the discharging port 211 is as close as possible to the flange of the shell pipe 21 under the condition that the welding condition of the discharging port 211 and the shell pipe 21 is met; combined with the fluidity characteristics of the fluid, the hole direction of the sampling port 213, the blowback port 212 and the discharging port 211 is all vertically downward.

[0045] In the specific implementation process, as shown in Figure 3 and Figure 5 , the helical blade assembly 25 is welded on the shaft body 26 by a group of helical blades, the outer circle of the helical blade has a certain safety gap with the inner wall of the shell pipe 21, and the safety gap should be appropriate, too large will lead to unsatisfactory sampling amount, and too small will cause friction jam with the inner wall of the shell pipe 21; in order to ensure that the powder can be transmitted from the sampling port 213 to the discharging port 211, the helical blade assembly 25 needs to cover the whole pipeline of the shell pipe 21; the shaft diameter of the shaft body 26 is matched with the shaft sleeve of the motor 24, and the length of the shaft body 26 can meet the condition of penetrating out from the sampling port 213 position to be matched with the shaft sleeve of the motor 24, so as to guarantee the transmission performance of the motor.

[0046] In the specific implementation process, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 7 , in order to reduce the weight of the sampler, reduce the lever force borne by the branch flange 29, the pipe body 236 is shared with the transmission bracket 36 by welding; the transmission bracket 36 is a frame structure, the bottom of the transmission bracket 36 is provided with a center hole, the pipe body 236 is concentric with the center hole of the bottom of the transmission bracket 36; the diameter of the center hole is equal to the diameter of the shaft body 26 of the spiral blade assembly 25; the flange on the pipe body 236 is the same specification as the flange of the shell pipe 21, and the flange on the pipe body 236 is provided with the rear positioning groove 231; the rear positioning groove 231 cooperates with the front positioning groove 214, the rear end sealing gasket 232 is arranged between the rear positioning groove 231 and the front positioning groove 214 in cooperation with the positioning block 233; the shaft seal housing 235 is provided with the shaft seal ring 234, the thickness of the shaft seal ring 234 is determined by the depth of the shaft seal housing 235, the insertable depth of the positioning block 233 and the sealing pressure grade, so as to prevent the powder from running out from the gap between the shaft body 26 and the pipe body 236.

[0047] In the specific implementation process, as shown in Figure 1 and Figure 2 , the support frame 33 is a frame structure, the inner frame of the support frame 33 can accommodate the shell pipe 21, the motor 24, the push rod 34, the connecting piece 35, and the transmission bracket 36; in order to assist in centering the transmission bracket 36 and positioning the active track of the sampling mechanism 2, there is a guide groove 39 on each side of the support frame 33, a safety gap is left between the inner wall of the guide groove 39 and the guide rod 37, and the length of the guide groove 39 is greater than or equal to the travel of the guide rod 37 during the extension and extraction of the shell pipe 21; the position of the guide rod 37 is detected by two travel detection sensors 38, so as to realize automatic control.

[0048] The automatic powder sampling device provided in the embodiment can remotely send a sampling signal when sampling is needed. After receiving the sampling signal, the control air path system 32 controls the piston pneumatic actuator 31 to push the push rod 34 in the direction of the main pipeline 1, and the push rod 34 drives the sampling mechanism 2 to advance. At the same time, the back blowing mechanism 5 starts to work, the blow cleaning electromagnetic valve 51 is opened, the blow cleaning nitrogen enters the shell pipe 21 through the pressure reducing valve 53 and the blow cleaning electromagnetic valve 51, and the residual material in the shell pipe 21 is blown into the main pipeline 1 through the spiral blade assembly 25. At this time, the powder around the sampling head 27 is blown away, and the sampling head 27 can quickly reach the center position of the main pipeline 1 under the action of the wall breaking force of the chisel head structure of the sampling head 27. After the travel detection sensor 38 detects that the sampling mechanism 2 advances to the position, the back blowing mechanism 5 stops working, and the speed reducer 24 starts to work. The powder in the main pipeline 1 is subjected to the powder conveying force and enters the sampling port 213. The spiral blade assembly 25 rotates under the drive of the motor 24, the powder is conveyed to the discharge port 211 when the spiral blade rotates, and the powder falls into the sealed mixing hopper 41 through the discharge hose 43 under the action of gravity. After the sampling amount reaches the required amount, the remote control sends a sampling stop signal, the control air path system 29 controls the push rod 34 to drive the sampling mechanism 2 to retreat to the piston pneumatic actuator 31. At the same time, the back blowing mechanism 5 starts to work again to clean the powder in the shell pipe 21. After the travel detection sensor 38 detects that the sampling mechanism 2 retreats to the position through the guide rod 37, the motor 24 and the back blowing mechanism 5 stop working. The sampling work signal can be set according to the needs of single time period sampling or multiple time period mixed sampling, and full automatic sampling is realized. When the powder needs to be taken out for analysis, the operator can put the sampling bag against the discharge valve 44, open the discharge valve 44, and then the powder can be loaded into the sampling bag. Since the sampling head 27 is attached to the sealing seat 224, the powder and air pressure in the main pipeline 1 will not enter the shell pipe 21. When the discharge valve 44 is opened, the pressure in the sealed mixing hopper 41 will quickly decrease to a safe value, which can be observed through the pressure gauge 45, so as to avoid the problem of dust during sampling and achieve the effect of safety and environmental protection.

[0049] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0050] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0052] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simplified modification, equivalent change and modification of the above embodiment according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. An automatic powder sampling device, comprising a main pipeline for conveying powder during production; characterized in that: It also includes a support frame installed on the main pipeline, a sampling mechanism slidably connected to the support frame, one end of the sampling mechanism being connected to the main pipeline, the sampling mechanism being used to output the powder inside the main pipeline to the outside, a driving mechanism being installed on the support frame, the driving mechanism being used to drive the sampling mechanism to slide on the support frame, and a hopper being installed on the main pipeline, the support frame, or the sampling mechanism, the hopper being used to receive the powder output by the sampling mechanism; The sampling mechanism has the following structure: a branch flange is installed on the main pipeline, which communicates with the interior of the main pipeline; a support frame is fixed on the branch flange; a transmission support is slidably connected inside the support frame; a shell tube is installed on the transmission support, with both ends of the shell tube closed; a helical blade assembly is installed inside the shell tube; the shaft of the helical blade assembly extends outward from the center of the end of the shell tube into the transmission support; the end of the shell tube away from the transmission support extends into the support flange; the shell tube and the inner wall of the branch flange are sealed and slidably connected axially; a sampling head is installed at the end of the shell tube inside the branch flange; a sampling port is installed on the circumferential surface of the end of the shell tube inside the branch flange; a motor is installed on the transmission support, and the motor is connected to the shaft of the helical blade assembly located inside the transmission support; the hopper is connected to the shell tube through a pipeline. A backflush mechanism is provided on the sampling mechanism. The backflush mechanism includes a purge solenoid valve, a pressure reducing valve, and a purge hose. One end of the purge hose is connected to the shell tube at the end away from the main pipeline, and the other end of the purge hose is used to connect to a high-pressure gas source. The pressure reducing valve and the purge solenoid valve are provided on the purge hose. The sealing structure between the branch flange and the shell pipe is as follows: a sealing seat is provided inside the branch flange, and the sealing seat is also a flange-shaped structure. The end of the sealing seat is sealed to the end of the branch flange by a front sealing gasket. A packing gland is provided inside the sealing seat. The packing gland is fixed to the sealing seat by bolts. A stuffing box with an annular structure is formed between the packing gland and the inner wall of the sealing seat. Sealing packing is provided in the stuffing box. The shell pipe passes through the packing gland and the sealing seat, and the sealing packing contacts the outer wall of the shell pipe. The sealing structure between the shaft and the shell tube of the helical blade assembly is as follows: a tube is provided on the transmission support, the tube is connected to the shell tube, and both the tube and the shell tube are connected by a flange structure at the connection point. A rear sealing gasket and a positioning ring are provided in the flange structure. A shaft sealing box is formed between the positioning ring and the inner wall of the tube. A shaft sealing ring is provided in the shaft sealing box. The shaft of the helical blade assembly extends from the shell tube, passes through the tube, and enters the transmission support. The shaft sealing ring contacts the shaft. The sampling head is a chisel structure, and the length direction of the flat end of the chisel structure of the sampling head is set along the axial direction of the main pipeline.

2. The automatic powder sampling device according to claim 1, characterized in that: in Guide rods are provided on the transmission supports on both sides of the shell tube, and guide grooves are provided on the support frame at the corresponding positions of the guide rods. The guide rods are located in the guide grooves, and the direction of movement of the guide rods in the guide grooves is consistent with the axial direction of the shell tube.

3. The automatic powder sampling device according to claim 2, characterized in that: The drive mechanism includes a piston-type pneumatic actuator and a connecting member. The piston-type pneumatic actuator is provided with a push rod, which is connected to the transmission bracket through the connecting member. The axial direction of the push rod is parallel to the axial direction of the shell tube.

4. An automatic powder sampling device according to claim 3, characterized in that: The hopper is a closed mixing hopper, which is fixed to the main pipeline by a diagonal bracing. The closed mixing hopper is connected to the shell pipe through a discharge hose. A discharge valve is installed at the bottom of the closed mixing hopper. A pressure gauge is installed on the closed mixing hopper.

5. An automatic powder sampling device according to claim 2, characterized in that: Two stroke detection sensors are installed on the support frame at the guide groove. The stroke detection sensors are used to sense the movement position of the guide rod in the guide groove.

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