An injection adding device for a dynamic mixer

Abstract

The utility model relates to the technical field of injection addition, and specifically discloses an injection addition device for a dynamic mixer, comprising: a dynamic mixer body; an injection addition device body, the injection addition device body comprising: a check valve and an injection valve sequentially arranged along the auxiliary material injection direction, the bottom end of the check valve is connected to the top end of the injection valve; a nozzle, which is located at one end of the injection valve, and the end of the nozzle away from the injection valve has a nozzle outlet; an auxiliary material flange, which is located at the end of the check valve away from the injection valve; an auxiliary metering pump, which is arranged on one side of the auxiliary material flange and connected to the auxiliary material flange; a pressure alarm device, which is installed on the outside of the injection addition device body. The injection addition device for a dynamic mixer of the utility model has the advantages of reasonable structure, simple operation, and precise addition, and can meet different process requirements, improve product quality and production efficiency, and improve the stability of the injection equipment and the uniformity of the mixed product.

Description

Technical Field

[0001] The utility model relates to the technical field of injection addition, in particular to an injection addition device for a dynamic mixer. Background Art

[0002] Plastic modification is a relatively broad concept. Whether it is to improve the original properties of resin or improve them through physical, chemical, mechanical and other means, it is called plastic modification. The application range of plastic modification is relatively wide. It can be said that all plastics can be improved through modification methods, such as density, hardness, precision, appearance, processability, transparency, mechanical properties, electromagnetic properties, chemical properties, corrosion resistance, aging resistance, wear resistance, thermal properties, flame retardancy, barrier properties and cost. Plastic modification is the most effective way to reduce costs and improve performance.

[0003] Blending refers to mixing together. It is a physical method to evenly mix several materials to improve the performance of the materials. A typical example is the use of rubber mixers in industry to evenly mix different rubbers or rubber and plastic into rubber compounds. It is also possible to add certain special properties to the polymer to change the properties of the polymer, such as electrical conductivity.

[0004] An indispensable step in either blending or modification is the mixing of different melts. The equipment involved is the mixer and metering injection device. The mixing devices currently used in the chemical industry are static mixers or dynamic mixers. The main material metering device is generally a melt gear pump, and the auxiliary material metering device is generally a plunger pump or a melt gear pump.

[0005] The current challenges are that the main material has high temperature (>200°), high pressure (>20Mpa), and high viscosity (>2000Pa.s), while the required additive is a PPM (part per million) level aqueous solution. The amount of additive is relatively small and the viscosity is relatively low, making it difficult to inject. At the beginning of injection, the pressure and viscosity of the main material are very high, and it is easy to backflow and block the injection hole. It is also difficult to quickly disperse evenly after the injection hole is forced open with high pressure, and during the normal injection process, the main material backflows after the auxiliary material metering device fails. These will lead to an increase in the rate of unqualified products in industrial production.

[0006] Therefore, how to improve the stability of injection equipment and the uniformity of mixed products has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0007] In view of this, the utility model aims at the deficiencies of the prior art and proposes an injection adding device for a dynamic mixer, aiming to improve the stability of the injection equipment and the uniformity of the mixed product.

[0008] The utility model provides an injection adding device for a dynamic mixer, comprising:

[0009] Dynamic mixer body;

[0010] The injection adding device body comprises:

[0011] A check valve and an injection valve are sequentially arranged along the injection direction of the auxiliary material, wherein the bottom end of the check valve is connected to the top end of the injection valve;

[0012] A nozzle, which is located at one end of the injection valve, and the end of the nozzle away from the injection valve has a nozzle outlet;

[0013] An auxiliary material flange, which is located at an end of the check valve away from the injection valve;

[0014] An auxiliary metering pump, which is arranged on one side of the auxiliary material flange and connected to the auxiliary material flange;

[0015] A pressure alarm device is installed on the outside of the injection and addition device body.

[0016] Further, when the diameter φD of the nozzle outlet is less than 2, the ratio of the length of the nozzle outlet to the diameter of the nozzle outlet L / D is less than 5; when the diameter of the nozzle outlet is 2≤φD<5, the ratio of the length of the nozzle outlet to the diameter of the nozzle outlet L / D≤7.5; when the diameter of the nozzle outlet is φD≥5, the ratio of the length of the nozzle outlet to the diameter of the nozzle outlet L / D is an arbitrary value.

[0017] Furthermore, the dynamic mixer body comprises:

[0018] The injection area and mixing area are arranged from the inside to the outside;

[0019] The mixing zone includes movable teeth and stator teeth arranged circumferentially, and the stator teeth are arranged at intervals from the movable teeth;

[0020] The auxiliary material port cooperates with the nozzle, and the nozzle can be inserted into the auxiliary material port, and the opening of the auxiliary material port is inclined from the injection area toward the mixing area; the discharge pipe is connected to the dynamic mixer body, and the discharge pipe is used to discharge the mixed material.

[0021] Furthermore, the injection valve comprises:

[0022] an injection valve body, the injection valve body having a first channel and a second channel, one end of the first channel being connected to the check valve, one end of the second channel being connected to one end of the second channel, the other end of the second channel being connected to the nozzle, the first channel being vertically arranged to the second channel, and the second channel and the nozzle being located on the same axis;

[0023] A valve stem is used to penetrate into the second passage, and one end of the valve stem extends out of the second passage and into the nozzle.

[0024] Furthermore, the valve stem comprises:

[0025] A first valve stem portion, a second valve stem portion and a third valve stem portion are sequentially arranged and connected along a direction of the second passage close to the nozzle.

[0026] Furthermore, the injection valve further comprises:

[0027] A sealing ring, which is sleeved at the connection between the first valve stem portion and the second valve stem portion;

[0028] a sealing gasket, which is arranged at the connection between the second valve stem portion and the third valve stem portion;

[0029] Wherein, the sealing ring is an O-ring.

[0030] Furthermore, the injection valve further comprises:

[0031] A packing layer is provided between the injection valve body and the valve stem, and the packing layer is located at an end of the valve stem away from the nozzle;

[0032] The packing gland is located at one end of the injection valve body away from the nozzle, and the injection valve is located outside the injection valve.

[0033] Furthermore, the injection valve further comprises:

[0034] A driving motor, wherein an output end of the driving motor is connected to an end of the valve stem away from the nozzle.

[0035] Furthermore, the injection valve further comprises:

[0036] A heat medium channel is located in the injection valve body, and the two ends of the heat medium channel are respectively provided with a heat medium outlet and a heat medium inlet;

[0037] The injection adding device body has an auxiliary material flow path, the heat medium channel is arranged along the auxiliary material flow path, and the heat medium channel is in contact with the auxiliary material flow path to provide a required temperature for the auxiliary material flow;

[0038] Wherein, the heat medium inlet and the heat medium outlet are symmetrically arranged along the axial direction of the injection valve.

[0039] Furthermore, one end of the valve stem and the nozzle is a semicircular body, and one end of the valve stem close to the nozzle abuts against the nozzle outlet.

[0040] Compared with the prior art, the beneficial effect of the utility model lies in that the dynamic mixer body of the utility model is used to mix materials, ensure that the materials are mixed evenly, and improve product quality; the injection adding device body is used to add auxiliary materials to the dynamic mixer, so that the addition of auxiliary materials is more accurate and controllable; in the injection adding device body, the check valve is used to prevent the auxiliary materials from backflowing during the injection process, ensure the correct flow direction of the auxiliary materials, and avoid interference with the mixing process; the injection valve is used to control the injection speed and amount of the auxiliary materials, and can be flexibly adjusted as needed to meet different process requirements; the nozzle is used to spray the auxiliary materials evenly into the dynamic mixer to ensure that the auxiliary materials are fully mixed with the materials; the auxiliary material flange is connected to the auxiliary metering pump for accurately metering and controlling the amount of auxiliary materials added, and the auxiliary metering pump can set the auxiliary material addition speed according to the process requirements to ensure that the amount of auxiliary materials added is accurate and reliable; the pressure alarm device is used to monitor the working status of the injection adding device and issue an alarm in time.

[0041] The injection adding device for a dynamic mixer provided by the utility model has the advantages of reasonable structure, simple operation, accurate adding, etc., can meet different process requirements, improve product quality and production efficiency, and improve the stability of the injection equipment and the uniformity of the mixed product. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the overall structure of the injection adding device for a dynamic mixer of the utility model;

[0043] Figure 2 It is a schematic diagram of the injection adding device body of the injection adding device for a dynamic mixer of the utility model;

[0044] Figure 3 It is a top view of the injection adding device body of the injection adding device for a dynamic mixer of the utility model;

[0045] Figure 4 for Figure 2 A local enlarged view of point A;

[0046] Figure 5 It is a schematic structural diagram of a valve stem of an injection adding device for a dynamic mixer according to the utility model.

[0047] In the figure: 100, dynamic mixer body; 110, stator teeth; 120, mover teeth; 130, discharge pipe; 200, injection adding device body; 210, injection valve; 220, check valve; 230, nozzle; 240, auxiliary material flange; 250, valve stem; 251, first valve stem portion; 252, second valve stem portion; 253, third valve stem portion; 260, sealing ring; 270, sealing gasket; 280, packing layer; 290, packing gland; 300, heat medium inlet; 310, heat medium outlet. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] See also Figure 1-5As shown, this embodiment provides an injection adding device for a dynamic mixer, comprising: a dynamic mixer body 100; an injection adding device body 200, the injection adding device body 200 comprising: a check valve 220 and an injection valve 210 arranged in sequence along the auxiliary material injection direction, the bottom end of the check valve 220 is connected to the top end of the injection valve 210; a nozzle 230, which is located at one end of the injection valve 210, and the end of the nozzle 230 away from the injection valve 210 has a nozzle 230 outlet; an auxiliary material flange 240, which is located at the end of the check valve 220 away from the injection valve 210; an auxiliary metering pump, which is arranged on one side of the auxiliary material flange 240 and connected to the auxiliary material flange 240; a pressure alarm device, which is installed on the outside of the injection adding device body 200.

[0053] It can be seen that the dynamic mixer body 100 is used to mix the materials to ensure that the materials are mixed evenly and improve the product quality; the injection adding device body 200 is used to add auxiliary materials to the dynamic mixer, making the addition of auxiliary materials more accurate and controllable; in the injection adding device body 200, the check valve 220 is used to prevent the auxiliary materials from backflowing during the injection process, ensuring the correct flow direction of the auxiliary materials and avoiding interference with the mixing process; the injection valve 210 is used to control the injection speed and amount of the auxiliary materials, which can be flexibly adjusted as needed to meet different process requirements; the nozzle 230 is used to spray the auxiliary materials evenly into the dynamic mixer to ensure that the auxiliary materials are fully mixed with the materials; the auxiliary material flange 240 is connected to the auxiliary metering pump for accurately measuring and controlling the amount of auxiliary materials added. The auxiliary metering pump can set the auxiliary material addition speed according to the process requirements to ensure that the amount of auxiliary materials added is accurate and reliable; the pressure alarm device is used to monitor the working status of the injection adding device and issue an alarm in time.

[0054] It can be understood that the injection and addition device for the dynamic mixer provided in this embodiment has the advantages of reasonable structure, simple operation, and precise addition. It can meet different process requirements, improve product quality and production efficiency, and improve the stability of the injection equipment and the uniformity of the mixed product.

[0055] Specifically, when the diameter φD of the nozzle 230 outlet is less than 2, the ratio of the length of the nozzle 230 outlet and the diameter of the nozzle 230 outlet L / D is less than 5; when the diameter of the nozzle 230 outlet is 2≤φD<5, the ratio of the length of the nozzle 230 outlet and the diameter of the nozzle 230 outlet L / D≤7.5; when the diameter φD of the nozzle 230 outlet is ≥5, the ratio of the length of the nozzle 230 outlet and the diameter of the nozzle 230 outlet L / D is an arbitrary value.

[0056] It can be seen that the setting of the ratio of the diameter and length of the nozzle 230 outlet further improves the performance and effect of the injection adding device.

[0057] It is understandable that the design of the ratio of the diameter to the length of the nozzle 230 outlet is optimized according to the physical properties of the auxiliary material and the injection requirements. When the diameter φD of the nozzle 230 outlet is less than 2, the ratio of the length to the diameter L / D of the nozzle 230 outlet is controlled within a range of less than 5, which enables the nozzle 230 outlet to form a more concentrated jet when injecting the auxiliary material, thereby improving the dispersion and uniformity of the auxiliary material. At the same time, the smaller nozzle 230 outlet diameter can also reduce the waste of auxiliary materials and improve the utilization rate of auxiliary materials. When the diameter φD of the nozzle 230 outlet is between 2 and 5, the ratio of the length to the diameter L / D of the nozzle 230 outlet is controlled within a range of less than or equal to 7.5, which enables the nozzle 230 outlet to form a more concentrated jet when injecting the auxiliary material. The outlet 230 can maintain a certain injection intensity and ensure the uniform distribution of the auxiliary material. At the same time, a moderate ratio of the nozzle 230 outlet diameter to length can also improve the working stability of the injection adding device to a certain extent. When the diameter φD of the nozzle 230 outlet is greater than or equal to 5, the ratio L / D of the length and diameter of the nozzle 230 outlet can be any value. This is because when the diameter of the nozzle 230 outlet is larger, the injection intensity and distribution uniformity of the auxiliary material have been better guaranteed. At this time, the requirement for the ratio of the length and diameter of the nozzle 230 outlet is relatively low.

[0058] Specifically, the dynamic mixer body 100 includes: an injection zone and a mixing zone arranged in sequence from the inside to the outside; the mixing zone includes a movable tooth 120 and a stator tooth 110 arranged circumferentially, and the stator teeth 110 and the movable teeth 120 are arranged at intervals; the injection zone includes an auxiliary material port, the auxiliary material port cooperates with the nozzle 230, and the nozzle 230 can be inserted into the auxiliary material port, and the opening of the auxiliary material port is inclined from the injection zone toward the mixing zone; a discharge pipe 130, which is connected to the dynamic mixer body 100, and the discharge pipe 130 is used to discharge the mixed material.

[0059] It can be seen that the injection zone is used to enable the addition of auxiliary materials to directly enter the mixing zone, avoiding the loss and contamination of the materials during the transmission process; the alternating arrangement of the movable teeth 120 and the stator teeth 110 in the mixing zone causes the materials to be continuously sheared, collided and mixed during the mixing process, thereby achieving a more efficient mixing effect.

[0060] It can be seen that the auxiliary material port can facilitate the insertion of the nozzle 230 therein, ensuring the accurate addition of the auxiliary material; the inclined setting of the auxiliary material port helps the auxiliary material to smoothly enter the mixing area, avoiding blockage and leakage; the discharge pipe 130 is connected to the dynamic mixer body 100, which can easily discharge the mixed material for subsequent processing and use.

[0061] Specifically, the injection valve 210 includes: an injection valve body 210, the injection valve body 210 having a first channel and a second channel, one end of the first channel is connected to the check valve 220, one end of the second channel is connected to one end of the second channel, the other end of the second channel is connected to the nozzle 230, the first channel and the second channel are vertically arranged, and the second channel and the nozzle 230 are located on the same axis; a valve stem 250, the valve stem 250 is used to be inserted into the second channel, and one end of the valve stem 250 extends out of the second channel and extends into the nozzle 230.

[0062] It can be seen that the first channel and the second channel in the valve body of the injection valve 210 are arranged vertically, ensuring a clear flow direction of the auxiliary material and avoiding confusion and cross contamination; the valve stem 250 is passed through the second channel to control the opening and closing of the second channel, thereby controlling the injection speed and quality of the auxiliary material; one end of the valve stem 250 extends out of the second channel and extends into the nozzle 230, which can more accurately control the injection range and injection amount of the auxiliary material, further improving the accuracy of auxiliary material addition.

[0063] Specifically, the valve stem 250 includes: a first valve stem 250 portion 251, a second valve stem 250 portion 252 and a third valve stem 250 portion 253, which are arranged in sequence and connected along the direction of the second channel close to the nozzle 230.

[0064] It can be seen that the sequential arrangement of the first valve stem 250 portion 251 , the second valve stem 250 portion 252 and the third valve stem 250 portion 253 makes the structure of the valve stem 250 more reasonable and stable, and can better adapt to various working conditions during the injection process.

[0065] Specifically, the injection valve 210 also includes: a sealing ring 260, which is sleeved at the connection between the first valve stem 250 part 251 and the second valve stem 250 part 252; a sealing gasket 270, which is arranged at the connection between the second valve stem 250 part 252 and the third valve stem 250 part 253; wherein the sealing ring 260 is an O-ring 260.

[0066] It can be seen that the sealing ring 260 and the sealing gasket 270 can effectively prevent leakage inside the injection valve 210, thereby improving the sealing performance and service life of the injection valve 210; the use of the O-ring 260 makes the sealing effect more reliable and stable, and can meet high-demand process conditions.

[0067] Specifically, the injection valve 210 also includes: a packing layer 280 is provided between the valve body of the injection valve 210 and the valve stem 250, and the packing layer 280 is located at the end of the valve stem 250 away from the nozzle 230; a packing gland 290, which is located at the end of the valve body of the injection valve 210 away from the nozzle 230, and the injection valve 210 is located outside the injection valve 210.

[0068] Specifically, the injection valve 210 further includes a driving motor, wherein an output end of the driving motor is connected to an end of the valve stem 250 away from the nozzle 230 .

[0069] It can be seen that the packing layer 280 can effectively prevent leakage between the valve body of the injection valve 210 and the valve stem 250, thereby improving the sealing performance of the injection valve 210; the packing gland 290 can fix the packing layer 280 to prevent it from loosening and falling off; the use of the drive motor can realize automatic control and adjustment of the valve stem 250, thereby improving the automation degree and use efficiency of the injection valve 210.

[0070] Specifically, the injection valve 210 also includes: a heat medium channel located in the valve body of the injection valve 210, and the two ends of the heat medium channel are respectively provided with a heat medium outlet 310 and a heat medium inlet 300; the injection adding device body 200 has an auxiliary material flow path, and the heat medium channel is arranged along the auxiliary material flow path, and the heat medium channel is in contact with the auxiliary material flow path to provide the required temperature for the auxiliary material flow; wherein the heat medium inlet 300 and the heat medium outlet 310 are symmetrically arranged along the axial direction of the injection valve 210.

[0071] It can be seen that the setting of the heat medium channel can provide the required temperature for the auxiliary material flow, ensuring the stability and uniformity of the auxiliary material during the injection process; the symmetrical setting of the heat medium inlet 300 and the heat medium outlet 310 can ensure the uniform distribution of the heat medium, further improving the temperature control effect of the auxiliary material; the setting of the heat medium channel along the auxiliary material flow path can effectively improve the heat exchange efficiency between the heat medium and the auxiliary material, and further ensure the temperature stability and uniformity of the auxiliary material.

[0072] Specifically, one end of the valve stem 250 and the nozzle 230 is a semicircular body, and one end of the valve stem 250 close to the nozzle 230 abuts against the outlet of the nozzle 230 .

[0073] It can be seen that the end of the valve stem 250 close to the nozzle 230 is designed as a semicircular body, which can better abut against the outlet of the nozzle 230 to prevent leakage of materials during the injection process, thereby improving the stability and safety of the injection process.

[0074] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An injection adding device for a dynamic mixer, characterized in that: include: Dynamic mixer body; The injection adding device body comprises: A check valve and an injection valve are sequentially arranged along the injection direction of the auxiliary material, wherein the bottom end of the check valve is connected to the top end of the injection valve; A nozzle, which is located at one end of the injection valve, and the end of the nozzle away from the injection valve has a nozzle outlet; An auxiliary material flange, which is located at an end of the check valve away from the injection valve; An auxiliary metering pump, which is arranged on one side of the auxiliary material flange and connected to the auxiliary material flange; A pressure alarm device is installed on the outside of the injection and addition device body.

2. The injection adding device for a dynamic mixer according to claim 1, characterized in that: When the diameter φD of the nozzle outlet is less than 2, the ratio of the length of the nozzle outlet to the diameter of the nozzle outlet L / D is less than 5; when the diameter of the nozzle outlet is 2≤φD<5, the ratio of the length of the nozzle outlet to the diameter of the nozzle outlet L / D≤7.5; when the diameter of the nozzle outlet is φD≥5, the ratio of the length of the nozzle outlet to the diameter of the nozzle outlet L / D is an arbitrary value.

3. The injection adding device for a dynamic mixer according to claim 1, characterized in that: The dynamic mixer body comprises: The injection area and mixing area are arranged from the inside to the outside; The mixing zone includes movable teeth and stator teeth arranged circumferentially, and the stator teeth are arranged at intervals from the movable teeth; The injection zone includes an auxiliary material port, which cooperates with the nozzle and can be inserted into the auxiliary material port. The opening of the auxiliary material port is inclined from the injection zone toward the mixing zone; a discharge pipe is connected to the dynamic mixer body, and the discharge pipe is used to discharge the mixed material.

4. The injection adding device for a dynamic mixer according to claim 1, characterized in that: The injection valve comprises: an injection valve body, the injection valve body having a first channel and a second channel, one end of the first channel being connected to the check valve, one end of the second channel being connected to one end of the second channel, the other end of the second channel being connected to the nozzle, the first channel being vertically arranged to the second channel, and the second channel and the nozzle being located on the same axis; A valve stem is used to penetrate into the second passage, and one end of the valve stem extends out of the second passage and into the nozzle.

5. The injection adding device for a dynamic mixer according to claim 4, characterized in that: The valve stem comprises: A first valve stem portion, a second valve stem portion and a third valve stem portion are sequentially arranged and connected along a direction of the second passage close to the nozzle.

6. The injection adding device for a dynamic mixer according to claim 5, characterized in that: The injection valve also includes: A sealing ring, which is sleeved at the connection between the first valve stem portion and the second valve stem portion; a sealing gasket, which is arranged at the connection between the second valve stem portion and the third valve stem portion; Wherein, the sealing ring is an O-ring.

7. The injection adding device for a dynamic mixer according to claim 5, characterized in that: The injection valve also includes: A packing layer is provided between the injection valve body and the valve stem, and the packing layer is located at an end of the valve stem away from the nozzle; The packing gland is located at one end of the injection valve body away from the nozzle, and the injection valve is located outside the injection valve.

8. The injection adding device for a dynamic mixer according to claim 5, characterized in that: The injection valve also includes: A driving motor, wherein an output end of the driving motor is connected to an end of the valve stem away from the nozzle.

9. The injection adding device for a dynamic mixer according to claim 4, characterized in that: The injection valve also includes: A heat medium channel is located in the injection valve body, and the two ends of the heat medium channel are respectively provided with a heat medium outlet and a heat medium inlet; The injection adding device body has an auxiliary material flow path, the heat medium channel is arranged along the auxiliary material flow path, and the heat medium channel is in contact with the auxiliary material flow path to provide a required temperature for the auxiliary material flow; Wherein, the heat medium inlet and the heat medium outlet are symmetrically arranged along the axial direction of the injection valve.

10. The injection adding device for a dynamic mixer according to claim 4, characterized in that: One end of the valve stem and the nozzle is a semicircular body, and one end of the valve stem close to the nozzle abuts against the nozzle outlet.

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