Subcutaneous immunoreagent injector capable of controlling injection speed

Abstract

The invention relates to the technical field of injectors, in particular to a subcutaneous immunoreagent injector capable of controlling injection speed, which comprises an injection cylinder, a piston column is slidably connected in the injection cylinder, two symmetrically distributed handles are fixedly connected to the top of the injection cylinder, and a sealing plug is movably connected to the outer wall of the piston column. By arranging the sealing plug and installing the flow adjusting structure capable of adjusting the air inflow on the sealing plug, when the medicine flow is larger than the air inflow, negative pressure can be formed between the sealing plug of the syringe and the piston of the piston column, then continuous movement of the piston column is restrained through the pressure difference, and discomfort caused by the too high medicine administration speed is prevented; the injection speed is restrained through pressure difference, damage to the inner wall of the syringe is avoided, the detachable sealing plug can be installed on a common syringe, the flow speed control function is achieved, universality is high, and resource waste can be avoided through repeated utilization.

Description

Technical Field

[0001] The invention relates to the technical field of syringes, in particular to a subcutaneous immune reagent syringe capable of controlling injection speed. Background Art

[0002] Medical syringes are a convenient and fast drug introduction device. They are widely used in the treatment of various diseases because they generally do not cause other adverse symptoms in patients or large sores after use. In the injection process of some specific drugs, due to the influence of the pharmacological effects of the drugs themselves, it is necessary to slow down the administration speed, that is, the injection speed, so as not to cause strong discomfort or local allergic reactions in patients. In addition, when performing intramuscular or subcutaneous injections, too fast an injection speed will make the patient feel obvious pain, and will cause local swelling and hardening, which may easily cause unexpected worries and troubles to the patient. Once the injection is accompanied by a long period of pain and local discomfort, the patient will have a serious aversion to injection treatment, which is not conducive to the implementation of similar treatment methods in the future.

[0003] The prior art discloses a syringe with a publication number of CN108310543B that can realize liquid push flow rate control. According to the change of injection speed, the gas pressure in the slide groove changes synchronously, so that the slider slides under the gas pressure and generates different friction forces with the inner wall of the syringe, thereby realizing effective limitation of the injection speed. At the same time, no matter how the thrust applied to the pressure handle increases, there is always a correspondingly increased friction resistance to reduce the increase in the injection speed, so that the injection speed will not produce a sudden large-scale change; although it can realize that when the injection speed is too high, the slider pushes out and squeezes the inner wall of the syringe, thereby limiting the injection speed, but when the injection speed is too high and the syringe is squeezed, the large pressure is also easy to cause the inner wall of the syringe to be deformed by force, resulting in damage to the syringe or leakage, and it can only limit the flow rate within a certain range, and cannot be adaptively adjusted according to different injection requirements of different liquid medicines, and syringes are generally disposable, the cost of the additional control structure is high, and it is directly discarded after use, which causes a waste of resources. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to provide a subcutaneous immune reagent syringe with controllable injection speed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A subcutaneous immune reagent syringe with controllable injection speed comprises a syringe barrel, a piston column is slidably connected inside the syringe barrel, two symmetrically distributed handles are fixedly connected to the top of the syringe barrel, a sealing plug is movably connected to the outer wall of the piston column, two symmetrically distributed mounting plates are fixedly connected to the outer wall of the sealing plug, a slot matching the piston column is provided in the middle of the sealing plug, a vertically arranged opening is provided on the outer wall of the sealing plug, the end of the opening extends to the slot and communicates with the inner side of the slot, an annular groove is provided on the outer wall of the sealing plug, four evenly distributed arc blocks are fixedly connected to the inner wall of the annular groove, three hinges are provided between the four arc blocks, the four arc blocks are connected end to end by the provided hinges, a positioning structure is installed on each of the mounting plates, and the interior of the sealing plug is fixedly connected to Four fan-shaped support blocks are arranged in an array with the middle of the sealing plug as the center, the four fan-shaped support blocks are fixedly connected to four arc blocks respectively, and a flow regulating structure is installed on one of the fan-shaped support blocks; the flow regulating structure includes a rotating rod, which is rotatably connected to the fan-shaped support block, and the outer wall of the rotating rod is provided with a plurality of evenly distributed air holes, and the air holes are arranged in a circle with the rotating rod as the center, and the upper and lower ends of the plurality of air holes pass through the sealing plug to connect the upper and lower ends of the sealing plug, and the interior of the fan-shaped support block is provided with a receiving groove and a connecting groove, and the connecting groove is located on the outer side of the rotating rod, and the end of the receiving groove is connected with the end of the connecting groove, and the air holes are connected with the interior of the connecting groove, and the interior of the receiving groove is slidably connected with a flexible sealing strip, and when the rotating rod rotates, it can drive the flexible sealing strip to move along the connecting groove.

[0006] Furthermore, a toothed ring is fixedly connected to the outer wall of the rotating rod, an end face of the toothed ring is slidably connected to the inner wall of the connecting groove, a latch is fixedly connected to the outer wall of the toothed ring, and a toothed groove matching the toothed ring is formed on the outer wall of the flexible sealing strip.

[0007] Furthermore, the sealing plug is made of rubber, and an outer layer is fixedly connected to the outer wall of the sealing plug. The outer layer is wrapped around the outer side of the arc block, and both ends of the outer layer extend to the inner side of the opening.

[0008] Furthermore, the mounting piece passes through the outer covering layer and is fixedly connected to the arc block, two mounting pieces are connected to two arc blocks close to the opening, and the positioning structure is installed on the outer wall of one side of the mounting piece close to the opening.

[0009] Furthermore, the positioning structure includes a movable rod, which is rotatably connected to the outer wall of the mounting plate, the outer wall of the movable rod away from the hinge is threadedly connected with a knob, the lower end of the movable rod is slidably connected to a top block, one end of the knob is rotatably connected to the top block, and a bevel is provided at the top outer edge of the top block.

[0010] Furthermore, a slide is fixedly connected to the inner wall of the slot, and the slide fits the inner wall of the slot. A baffle is fixedly connected to the top of the inner wall of the slot, and the baffle fits the inner wall of the slot.

[0011] Furthermore, a vertically arranged air permeable tube is fixedly connected to the interior of the sealing plug, the upper and lower ends of the air permeable tube are connected to the upper and lower sides of the sealing plug, and the top of the air permeable tube is threadedly connected to a cylinder cover.

[0012] Furthermore, an oblique groove is provided at the bottom of the outer side of the arc-shaped block, and the outer circle radius of the arc-shaped block is equal to the inner diameter of the injection barrel.

[0013] Compared with the existing technology, the present invention has the following beneficial effects: 1. When injecting drugs, the rotating rod is rotated to drive the flexible sealing strip to move. The cross-sectional area of ​​the gas entering the syringe is controlled by the number of air holes covered by the flexible sealing strip, so that the air intake volume when injecting drugs can be easily adjusted. When the drug flow rate is greater than the air intake volume, a negative pressure will be formed between the sealing plug of the syringe and the piston of the piston rod, and the piston rod will be inhibited from continuing to move by the pressure difference to prevent discomfort caused by excessive drug administration speed. When the drug injection speed is moderate, no pressure difference will be formed, and the air intake volume can be adjusted when injecting drugs, which is equivalent to an adjustable injection speed, which can adapt to different drug injections; 2. The present invention adjusts the air intake when injecting the drug and suppresses the injection speed by the pressure difference generated during injection, without causing damage to the inner wall of the syringe; 3. The present invention is provided with a detachable sealing plug, which can be unfolded along the opening. When installing, the sealing plug is wrapped around the outside of the piston column, and the slot is stuck in the outer wall of the piston column. After pressing the sealing plug, the sealing plug is inserted into the inside of the piston column, and the mounting piece contacts the handle. The mounting piece is fixed to the handle through the positioning structure, and the same is true when disassembling. It can be installed on an ordinary syringe, so that it has the function of flow rate control, has high versatility, and can be reused to avoid waste of resources; To sum up, the present invention provides a sealing plug on which a flow regulating structure capable of adjusting the air intake volume is installed. When the drug flow rate is greater than the air intake volume, a negative pressure will be formed between the sealing plug of the syringe and the piston of the piston column, thereby suppressing the continued movement of the piston column through the pressure difference, thereby preventing discomfort caused by excessive drug administration speed. The injection speed is suppressed by the pressure difference, and no damage is caused to the inner wall of the syringe. The detachable sealing plug can be installed on an ordinary syringe to have the function of flow rate control, has high versatility, and can be reused to avoid waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a cross-sectional schematic diagram of the present invention; Figure 3 The present invention Figure 1 A schematic diagram of the structure enlargement at the center A; Figure 4 It is a three-dimensional structural schematic diagram of the sealing plug of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the sealing plug of the present invention in another direction; Figure 6 is a transverse cross-sectional view of the sealing plug of the present invention; Figure 7 is a longitudinal sectional view of the sealing plug of the present invention; Figure 8 is a schematic diagram of the internal structure of the sealing plug of the present invention; Fig. 9 The present invention Figure 4 A schematic diagram of the structure enlarged at B in the middle; Fig.10 The present invention Figure 7 A schematic diagram of the structure enlarged at E in the middle; Fig.11 The present invention Figure 6 A schematic diagram of the structure enlarged at C in the middle; Fig.12 The present invention Figure 6 Enlarged schematic diagram of the structure at D in the middle.

[0015] In the figure: 1. syringe barrel; 2. piston column; 3. handle; 4. sealing plug; 5. mounting plate; 6. slot; 7. opening; 8. positioning structure; 9. flow regulating structure; 10. arc block; 11. hinge; 12. fan-shaped support block; 13. rotating rod; 14. air vent; 15. storage groove; 16. connecting groove; 17. gear ring; 18. flexible sealing strip; 19. tooth groove; 20. movable rod; 21. knob; 22. baffle; 23. slide; 24. inclined groove; 25. outer layer; 26. air vent; 27. top block. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] Reference Figure 1-Figure 12 , a subcutaneous immune reagent syringe with controllable injection speed, comprising a syringe 1, a piston column 2 is slidably connected inside the syringe 1, two symmetrically distributed handles 3 are fixedly connected to the top of the syringe 1, a sealing plug 4 is movably connected to the outer wall of the piston column 2, two symmetrically distributed mounting plates 5 are fixedly connected to the outer wall of the sealing plug 4, a slot 6 adapted to the piston column 2 is provided in the middle of the sealing plug 4, a vertically arranged opening 7 is provided on the outer wall of the sealing plug 4, the end of the opening 7 extends to the slot 6 and is connected to the inner side of the slot 6, an annular groove is provided on the outer wall of the sealing plug 4, four evenly distributed arc blocks 10 are fixedly connected to the inner wall of the annular groove, three hinges 11 are provided between the four arc blocks 10, the four arc blocks 10 are connected end to end by the provided hinges 11, a positioning structure 8 is installed on each mounting plate 5, four arc blocks 10 are fixedly connected to the inner wall of the sealing plug 4 with the middle of the sealing plug 4 as the center of the circle An array of fan-shaped support blocks 12, four of which are fixedly connected to four arc-shaped blocks 10, wherein a flow regulating structure 9 is installed on one of the fan-shaped support blocks 12; the flow regulating structure 9 comprises a rotating rod 13, which is rotatably connected to the fan-shaped support block 12; a plurality of evenly distributed air holes 14 are provided on the outer wall of the rotating rod 13, the air holes 14 are arranged in a circle with the rotating rod 13 as the center, the upper and lower ends of the plurality of air holes 14 pass through the sealing plug 4 to connect the upper and lower ends of the sealing plug 4, a receiving groove 15 and a connecting groove 16 are provided inside the fan-shaped support block 12, the connecting groove 16 is located outside the rotating rod 13, the end of the receiving groove 15 is connected to the end of the connecting groove 16, the air holes 14 are connected to the inside of the connecting groove 16, the inside of the receiving groove 15 is slidably connected to a flexible sealing strip 18, and when the rotating rod 13 rotates, the flexible sealing strip 18 can be driven to move along the connecting groove 16.

[0019] When the present invention is in use, the sealing plug 4 can be unfolded along the opening 7, and then the sealing plug 4 is wrapped around the outside of the piston column 2, the slot 6 is stuck in the outer wall of the piston column 2, and after pressing the sealing plug 4, the sealing plug 4 is inserted into the inside of the piston column 2, and the mounting piece 5 is in contact with the handle 3. The mounting piece 5 is fixed to the handle 3 through the positioning structure 8. When injecting medicine, the rotating rod 13 is rotated to drive the flexible sealing strip 18 to move. The number of air holes 14 covered by the flexible sealing strip 18 is used to control the cross-sectional area of ​​the gas entering the injection barrel 1, so that the air intake amount when injecting medicine can be conveniently adjusted. When the medicine is injected, When the flow rate is greater than the air intake, negative pressure will be formed between the sealing plug 4 of the syringe barrel 1 and the piston of the piston rod 2, and the piston rod 2 will be inhibited from continuing to move through the pressure difference to prevent discomfort caused by excessive drug administration speed. When the drug injection speed is moderate, no pressure difference will be formed, and the air intake volume can be adjusted when injecting the drug, which is equivalent to an adjustable injection speed, which can adapt to different drug injections. At the same time, the injection speed is suppressed by the pressure difference, and the inner wall of the syringe barrel 1 will not be damaged. The detachable sealing plug 4 can be installed on an ordinary syringe to enable it to have the function of flow rate control, with high versatility and repeated use to avoid waste of resources.

[0020] Among them, the outer wall of the rotating rod 13 is fixedly connected with a toothed ring 17, the end face of the toothed ring 17 is slidably connected with the inner wall of the connecting groove 16, the outer wall of the toothed ring 17 is fixedly connected with a latch tooth, and the outer wall of the flexible sealing strip 18 is provided with a toothed groove 19 that matches the toothed ring 17. When adjusting the air intake, by rotating the rotating rod 13, the toothed ring 17 fixed on the outer side of the rotating rod 13 will also rotate with the rotating rod 13, and the toothed ring 17 will mesh with the toothed groove 19 on the outer wall of the flexible sealing strip 18, and then the rotation of the toothed ring 17 drives the flexible sealing strip 18 to move, so that the flexible sealing strip 18 slides from the storage groove 15 to the inside of the connecting groove 16, and sequentially covers each air vent 14, so that the air intake during drug injection can be conveniently adjusted to control the injection speed of the drug solution.

[0021] Among them, the sealing plug 4 is made of rubber, and the outer wall of the sealing plug 4 is fixedly connected with an outer layer 25, which is wrapped around the outer side of the arc block 10. Both ends of the outer layer 25 extend to the inner side of the opening 7. An inclined groove 24 is provided at the bottom of the outer side of the arc block 10. The setting of the inclined groove 24 can facilitate the sealing plug 4 to be inserted into the interior of the syringe 1. The outer circle radius of the arc block 10 is equal to the inner diameter of the syringe 1. Specifically, the outer layer 25 has a certain thickness. After the outer side of the arc block 10 is wrapped with the outer layer 25, it will be an interference fit with the inner wall of the syringe 1. When the sealing plug 4 is inserted into the interior of the syringe 1, the arc block 10 will rotate slightly along the hinge 11, so that the arc block 10 will shrink toward the middle, squeezing the sealing plug 4 and the opening 7, thereby making the sealing between the sealing plug 4 and the piston column 2 better and avoiding air leakage.

[0022] Among them, the mounting piece 5 passes through the outer covering 25 and is fixedly connected with the arc block 10, the two mounting pieces 5 are connected to the two arc blocks 10 near the opening 7, the positioning structure 8 is installed on the outer wall of the mounting piece 5 near the opening 7, the positioning structure 8 includes a movable rod 20, the movable rod 20 is rotatably connected to the outer wall of the mounting piece 5, the outer wall of the movable rod 20 away from the hinge is threadedly connected with a knob 21, the lower end of the movable rod 20 is slidably connected with a top block 27, one end of the knob 21 is rotatably connected to the top block 27, and an oblique angle is provided at the top outer edge of the top block 27. Specifically, when fixing the mounting piece 5, after the mounting piece 5 is in contact with the handle 3, the movable rod 20 is rotated so that the movable rod 20 is in a vertical downward state, and then the knob 21 is rotated. The knob 21 moves toward the bottom of the mounting piece 5 under rotation, and then the pusher top block 27 is inserted into the bottom of the handle 3, so that the mounting piece 5 and the handle 3 are fixed together, thereby installing the sealing plug 4 in place.

[0023] Among them, the inner wall of the slot 6 is fixedly connected with a slide 23, which fits with the inner wall of the slot 6, and the top of the inner wall of the slot 6 is fixedly connected with a baffle 22, which fits with the inner wall of the slot 6. The setting of the baffle 22 is used to strengthen the sealing between the sealing plug 4 and the piston column 2, and the baffle 22 is made of a material with a low surface friction coefficient to reduce the friction of the piston column 2 when it moves.

[0024] Among them, a vertically arranged air vent tube 26 is fixedly connected to the inside of the sealing plug 4, and the upper and lower ends of the air vent tube 26 are connected to the upper and lower sides of the sealing plug 4. The top of the air vent tube 26 is threadedly connected to a tube cover. Specifically, when extracting the medicine liquid and expelling the air inside the syringe through the syringe, the tube cover on the top of the air vent tube 26 can be opened to increase the cross-sectional area of ​​the gas flow path, avoid limiting the injection speed when extracting the medicine liquid and expelling the air inside the syringe, and facilitate the use of the syringe.

[0025] Working principle: When in use, the sealing plug 4 can be unfolded along the opening 7, and then the sealing plug 4 is wrapped around the outside of the piston column 2, and the slot 6 is stuck in the outer wall of the piston column 2. After pressing the sealing plug 4, the sealing plug 4 is inserted into the inside of the piston column 2, and after the mounting piece 5 is in contact with the handle 3, the movable rod 20 is rotated so that the movable rod 20 is in a vertical downward state, and then the knob 21 is rotated. The knob 21 moves toward the bottom of the mounting piece 5 under the rotation, and then the pusher top block 27 is inserted into the bottom of the handle 3, so that the mounting piece 5 and the handle 3 is fixed together, so that the sealing plug 4 is installed in place. When adjusting the injection speed, by rotating the rotating rod 13, the toothed ring 17 fixed on the outer side of the rotating rod 13 will also rotate with the rotating rod 13, and the toothed ring 17 is engaged with the toothed groove 19 on the outer wall of the flexible sealing strip 18, and then the rotation of the toothed ring 17 drives the flexible sealing strip 18 to move, so that the flexible sealing strip 18 slides from the receiving groove 15 to the inside of the communicating groove 16, and sequentially covers each vent hole 14, so that the air intake amount when injecting the medicine can be conveniently adjusted to control the injection speed of the liquid medicine.

[0026] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A subcutaneous immunological reagent syringe capable of controlling injection speed, comprising a syringe barrel (1), a piston rod (2) being slidably connected to the inside of the syringe barrel (1), and two symmetrically distributed handles (3) being fixedly connected to the top of the syringe barrel (1), characterized in that: The outer wall of the piston column (2) is movably connected to a sealing plug (4), and the outer wall of the sealing plug (4) is fixedly connected to two symmetrically distributed mounting plates (5). The middle of the sealing plug (4) is provided with a slot (6) adapted to the piston column (2), and the outer wall of the sealing plug (4) is provided with a vertically arranged opening (7), and the end of the opening (7) extends to the slot (6) and communicates with the inner side of the slot (6). The outer wall of the sealing plug (4) is provided with an annular groove, and the inner wall of the annular groove is fixedly connected to four evenly distributed arc blocks ( 10), three hinges (11) are arranged between the four arc-shaped blocks (10), the four arc-shaped blocks (10) are connected end to end via the hinges (11), a positioning structure (8) is installed on each of the mounting plates (5), four fan-shaped support blocks (12) arranged in an array with the middle of the sealing plug (4) as the center are fixedly connected to the inside of the sealing plug (4), the four fan-shaped support blocks (12) are fixedly connected to the four arc-shaped blocks (10) respectively, and a flow regulating structure (9) is installed on one of the fan-shaped support blocks (12); The flow regulating structure (9) comprises a rotating rod (13), wherein the rotating rod (13) is rotatably connected to the fan-shaped support block (12); a plurality of evenly distributed air holes (14) are provided on the outer wall of the rotating rod (13); the air holes (14) are arranged in a circle with the rotating rod (13) as the center; upper and lower ends of the plurality of air holes (14) penetrate the sealing plug (4) to communicate with the upper and lower ends of the sealing plug (4); a receiving groove (15) and a communicating groove (16) are provided inside the fan-shaped support block (12); the communicating groove (16) is located outside the rotating rod (13); the end of the receiving groove (15) is connected to the end of the communicating groove (16); the air holes (14) are connected to the inside of the communicating groove (16); a flexible sealing strip (18) is slidably connected to the inside of the receiving groove (15); when the rotating rod (13) rotates, the flexible sealing strip (18) can be driven to move along the communicating groove (16).

2. A subcutaneous immunological reagent syringe with controllable injection speed according to claim 1, characterized in that: The outer wall of the rotating rod (13) is fixedly connected to a toothed ring (17), the end surface of the toothed ring (17) is slidably connected to the inner wall of the connecting groove (16), the outer wall of the toothed ring (17) is fixedly connected to a latching tooth, and the outer wall of the flexible sealing strip (18) is provided with a toothed groove (19) that matches the toothed ring (17).

3. A subcutaneous immunological reagent syringe with controllable injection speed according to claim 1, characterized in that: The sealing plug (4) is made of rubber, and an outer layer (25) is fixedly connected to the outer wall of the sealing plug (4). The outer layer (25) is wrapped around the outer side of the arc block (10), and both ends of the outer layer (25) extend to the inner side of the opening (7).

4. A subcutaneous immunological reagent syringe with controllable injection speed according to claim 3, characterized in that: The mounting piece (5) passes through the outer covering layer (25) and is fixedly connected to the arc-shaped block (10); two mounting pieces (5) are connected to two arc-shaped blocks (10) near the opening (7); and the positioning structure (8) is installed on an outer wall of one side of the mounting piece (5) near the opening (7).

5. A subcutaneous immunological reagent syringe with controllable injection speed according to claim 4, characterized in that: The positioning structure (8) comprises a movable rod (20), the movable rod (20) being rotatably connected to the outer wall of the mounting plate (5), the outer wall of the movable rod (20) away from the hinge being threadedly connected to a knob (21), the lower end of the movable rod (20) being slidably connected to a top block (27), one end of the knob (21) being rotatably connected to the top block (27), and a bevel is provided at the top outer edge of the top block (27).

6. A subcutaneous immunological reagent syringe with controllable injection speed according to claim 1, characterized in that: A slide plate (23) is fixedly connected to the inner wall of the slot (6), and the slide plate (23) fits the inner wall of the slot (6). A stop bar (22) is fixedly connected to the top of the inner wall of the slot (6), and the stop bar (22) fits the inner wall of the slot (6).

7. A subcutaneous immunological reagent syringe with controllable injection speed according to claim 1, characterized in that: A vertically arranged air vent tube (26) is fixedly connected to the interior of the sealing plug (4); the upper and lower ends of the air vent tube (26) are connected to the upper and lower sides of the sealing plug (4); and the top of the air vent tube (26) is threadedly connected to a cylinder cover.

8. A subcutaneous immunological reagent syringe with controllable injection speed according to claim 1, characterized in that: An inclined groove (24) is provided at the bottom of the outer side of the arc-shaped block (10), and the outer circle radius of the arc-shaped block (10) is equal to the inner diameter of the injection cylinder (1).

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