Nursing device for assisting blood purification

Abstract

The invention relates to the technical field of auxiliary blood purification nursing, and discloses a nursing device for assisting blood purification. Comprising a bridle, a frame is arranged on the upper surface of the bridle, a spring is fixedly connected to the inner wall of the frame, a hemostasis block is fixedly connected to the end, away from the frame, of the spring, a mounting base is fixedly connected to the upper surface of the hemostasis block, a baffle is movably connected to the side surface of the mounting base, and a limiting plate is fixedly connected to the side surface of the baffle. The hemostasis block is pulled upwards through the elasticity of the spring, so that a needle head for dialysis of a patient can extend into the frame through the space between the opening and the hemostasis block to be inserted into the blood vessel of the patient for blood purification, and the hemostasis block can slightly extrude the needle head for dialysis; the extrusion plate can be attached to a needle tube used by the needle for limiting, and the extrusion of the hemostatic block on the needle and the limiting of the extrusion plate on the needle tube are matched, so that the needle can be prevented from shaking, and the stability of inserting the needle into a blood vessel of a patient is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary blood purification nursing technology, and in particular to a nursing device for assisting blood purification. Background Art

[0002] Blood purification, also known as dialysis in daily life, is a separation and purification technique that separates small molecules from biomacromolecules by diffusion through a semipermeable membrane into water (or buffer). Dialysis therapy is a treatment method that removes components (solutes or water) from body fluids through a semipermeable membrane. It is generally divided into hemodialysis and peritoneal dialysis. Hemodialysis, also known as artificial kidney or dialysis, is a type of blood purification technology. It utilizes the principle of a semipermeable membrane to remove harmful and excess metabolic waste and electrolytes from the body through diffusion and convection, thereby purifying the blood and correcting water, electrolyte, and acid-base balances. The semipermeable membrane used in hemodialysis machines is 10 to 20 microns thick, with an average pore size of 3 nanometers. This allows only small molecules with a molecular weight of less than 15,000 and some medium-molecular substances to pass through, while macromolecules with a molecular weight greater than 35,000 are excluded. Therefore, proteins, pyrogens, viruses, bacteria, and blood cells are all impermeable; urine is mostly composed of water, and if an artificial kidney is to replace the kidney, a large amount of water must be removed from the blood. The artificial kidney can only use osmotic pressure and ultrafiltration pressure to achieve the purpose of removing excess water. The artificial kidney used, that is, the hemodialysis device, has all of the above functions, thereby regulating the quality and quantity of blood to make it close to the physiological state. The needle hole left after puncture is large, which makes it difficult to stop bleeding at the puncture site after the blood purification is completed. It takes a long time to compress the needle hole to complete the hemostasis. After the blood purification is completed, patients with coagulation disorders need to compress the needle hole for a longer time, so they need to use a blood purification auxiliary care device to compress the needle hole to stop bleeding.

[0003] Usually, when patients undergo dialysis, medical tape is used to fix the needle and syringe used for dialysis, which makes the needle and syringe easily move due to the shaking of the patient's arm, making it easy for the needle to cause secondary trauma to the needle hole in the patient's arm. At the same time, when the needle is removed from the blood vessel of the patient's arm, it is necessary to press the patient's needle hole for a long time, resulting in excessive pressure that may cause bruising on the needle hole or insufficient pressure that may cause blood to flow out of the needle hole. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present invention provides a nursing device for assisting in blood purification. By utilizing the elasticity of a spring, a hemostatic block is pulled upward, causing the upper half of the hemostatic block to extend out of the interior of a frame. This enables a baffle plate and a limit plate to swing movably. The limit plate and the baffle plate are placed parallel and clamped on the outer surface of the frame. By using a rubber block, the friction between the limit plate and the frame can be increased, creating a certain gap between the hemostatic block and the opening of the frame. The needle for the patient's dialysis can extend through the gap between the opening and the hemostatic block into the interior of the frame and be inserted into the patient's blood vessel for blood purification. Once again, by utilizing the elasticity of the spring, the hemostatic block can slightly squeeze the needle used for dialysis. By sliding a moving block along the frame, the two moving blocks can be pushed in opposite directions, causing a pressing plate to fit and limit the syringe tube used by the needle. An insertion rod is passed through a hollow tube and extends into the sliding portion of the moving block. By using a sealing ring, the friction between the insertion rod and the hollow tube can be increased when the insertion rod is fitted into the hollow tube, and the sealing ring can fill the gap generated at the fitting portion of the insertion rod and the hollow tube. By continuously pushing the insertion rod, the second suction cup can be squeezed, and the second suction cup can adsorb on the sliding portion of the moving block to fix the moving block. In combination with the squeezing of the needle by the hemostatic block and the limiting of the syringe tube by the pressing plate, the needle can be prevented from shaking, improving the stability of the needle inserted into the patient's blood vessel. A part of a pre-fixed belt extending out of the interior of a strap can be pulled to one side, reducing the diameter between the straps. By using a round hole, the pre-fixed belt can be sleeved on the surface of a hanging rod. When the round hole is sleeved on the surface of the hanging rod by using a rubber sleeve, the rubber sleeve can expand the interior of the round hole to fix the pre-fixed belt, enabling the device to be worn at a designated position on the patient's arm. When the patient has completed dialysis, the limit plate can be pulled upward to separate the rubber block from the frame, and the insertion rod can be pulled away from the sliding portion of the moving block. The needle is removed, and the limit plate is released, allowing the hemostatic block to reset using the elasticity of the spring. The reset of the hemostatic block can drive the hollow seat and the first suction cup to move downward together. Due to the rubber material of the hollow seat and the hemostatic cotton, they can promptly fit with the needle hole on the patient's arm, enabling the first suction cup to adsorb on the skin around the needle hole. Pull the U-shaped portion below the strap, and use a push rod to slide a fastening block downward. By using a ball, the sliding efficiency of the fastening block can be increased, and the rubber seat facilitates fixing the height of the movement of the fastening block. As the diameter of the strap continuously decreases, the hemostatic block can press the needle hole on the patient's arm, thus promptly pressing and stopping the bleeding at the needle hole on the patient's arm and other advantages.

[0006] (II) Technical Solution

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising a strap, the upper surface of the strap is provided with a frame, the inner wall of the frame is fixedly connected to a spring, the end of the spring away from the frame is fixedly connected to a hemostatic block, the upper surface of the hemostatic block is fixedly connected to a mounting seat, the side surface of the mounting seat is movably connected to a baffle, the side surface of the baffle is fixedly connected to a limiting plate, and the limiting plate is fitted with the outer surface of the frame, the lower surface of the hemostatic block is provided with a first suction cup, the lower surface of the hemostatic block is provided with a hollow seat, and the interior of the hollow seat is provided with hemostatic cotton.

[0008] Preferably, a moving block is slidably connected to the front surface of the frame, an extrusion plate is fixedly connected to the side surface of the moving block, and an opening is provided on the front surface of the frame, and the opening is located behind the extrusion plate.

[0009] Preferably, a hollow tube is fixedly connected to the front surface of the moving block, and a sealing ring is provided inside the hollow tube.

[0010] Preferably, an insertion rod is embedded in the interior of the hollow tube, a stopper is fixedly connected to the front end of the insertion rod, a second suction cup is provided at the rear end of the insertion rod, and the second suction cup is attracted to the interior of the frame.

[0011] Preferably, a pre-fixing belt is provided on the side surface of the strap, and the side surface of the pre-fixing belt extends out of the interior of the strap, and a circular hole is provided inside the pre-fixing belt.

[0012] Preferably, a fastening block is sleeved on the outer surface of the strap, a groove is provided inside the fastening block, and the strap is slidably connected to the inside of the groove.

[0013] Preferably, a ball is movably connected to the inner wall of the groove, and a rubber seat is provided on the inner wall of the groove.

[0014] Preferably, a push rod is fixedly connected to the front surface of the fastening block, and a fitting seat is provided on the upper surface of the fastening block.

[0015] Preferably, a hanging rod is fixedly connected to the side surface of the fastening block, and the hanging rod is connected to the pre-fixing belt sleeve through a circular hole, and the outer surface of the hanging rod is sleeved with a rubber sleeve.

[0016] Preferably, the hollow seat and the extrusion plate are both made of rubber, and the side surface of the limiting plate is provided with a rubber block.

[0017] Compared with the prior art, the present invention provides a nursing device for assisting blood purification, which has the following beneficial effects:

[0018] 1. The present invention utilizes the elasticity of the spring to pull the hemostatic block upward, causing the upper half of the hemostatic block to extend out of the interior of the frame, enabling the baffle and the limit plate to swing movably. The limit plate and the baffle are placed parallel and clamped on the outer surface of the frame. The rubber block is used to increase the friction between the limit plate and the frame, creating a certain gap between the hemostatic block and the opening of the frame. The dialysis needle of the patient can extend through the gap between the opening and the hemostatic block into the interior of the frame and be inserted into the patient's blood vessel for blood purification. Once again, using the elasticity of the spring, the hemostatic block can slightly squeeze the needle used for dialysis. By sliding the moving block and the frame, the two moving blocks can be pushed in opposite directions, enabling the pressing plate to fit and limit the syringe tube used by the needle. The insertion rod penetrates through the hollow tube and extends into the sliding part of the moving block. The sealing ring can increase the friction between the insertion rod and the hollow tube, filling the gap generated at the fitting part of the insertion rod and the hollow tube. By continuously pushing the insertion rod, it can squeeze the second suction cup, and the second suction cup can adsorb on the sliding part of the moving block to fix the moving block. Combining the squeezing of the needle by the hemostatic block and the limiting of the syringe tube by the pressing plate, the needle can be prevented from shaking, improving the stability of the needle inserted into the patient's blood vessel.

[0019] 2. A part of the pre-fixed band extending out of the interior of the strap can be pulled to one side, reducing the diameter between the straps. The pre-fixed band can be sleeved on the surface of the hanging rod through the round hole. When the round hole is sleeved on the surface of the hanging rod using the rubber sleeve, the rubber sleeve can expand the interior of the round hole to fix the pre-fixed band, enabling the device to be worn at a specified position on the patient's arm. After the patient finishes dialysis, the limit plate can be pulled upward to separate the rubber block from the frame, and the insertion rod can be pulled away from the sliding part of the moving block. The needle is removed, and the limit plate is released, allowing the hemostatic block to reset using the elasticity of the spring. The reset of the hemostatic block can drive the hollow seat and the first suction cup to move downward together. Using the rubber material of the hollow seat and the hemostatic cotton, it can promptly fit the needle hole on the patient's arm, enabling the first suction cup to adsorb on the skin around the needle hole. Pull the U-shaped part below the strap, and use the push rod to slide the fastening block downward. The ball can improve the sliding efficiency of the fastening block, and the rubber seat facilitates fixing the height of the movement of the fastening block. By continuously reducing the diameter of the strap, the hemostatic block can press the needle hole on the patient's arm, thus promptly pressing and stopping the bleeding of the needle hole on the patient's arm. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is Figure 1 the schematic diagram of the structure at A in

[0022] Figure 3 is a schematic diagram of the split structure of the hollow tube of the present invention;

[0023] Figure 4 This is the upward view structural schematic diagram of the hemostatic block of the present invention;

[0024] Figure 5 This is the structural schematic diagram of the fastening block of the present invention.

[0025] Wherein: 1. Frame; 2. Hemostatic block; 3. Rubber block; 4. Round hole; 5. Rubber sleeve; 6. Hanging rod; 7. Push rod; 8. Fastening block; 9. Band; 10. Pre-fixing band; 11. Baffle; 12. Mounting seat; 13. Moving block; 14. Insertion rod; 15. Hollow tube; 16. Extrusion plate; 17. Opening; 18. Stopper; 19. Groove; 20. Ball; 21. Fitting seat; 22. Rubber seat; 23. Hollow seat; 24. Limiting plate; 25. Hemostatic cotton; 26. First suction cup; 27. Spring; 28. Sealing ring; 29. Second suction cup. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 - 5 , a nursing device for assisting in blood purification, including a band 9. A frame 1 is arranged on the upper surface of the band 9. A spring 27 is fixedly connected to the inner wall of the frame 1. One end of the spring 27 away from the frame 1 is fixedly connected to a hemostatic block 2. A mounting seat 12 is fixedly connected to the upper surface of the hemostatic block 2. A baffle 11 is movably connected to the side surface of the mounting seat 12. A limiting plate 24 is fixedly connected to the side surface of the baffle 11. A rubber block 3 is arranged on the side surface of the limiting plate 24, and the limiting plate 24 is attached to the outer surface of the frame 1. A first suction cup 26 is arranged on the lower surface of the hemostatic block 2. A hollow seat 23 is arranged on the lower surface of the hemostatic block 2. Hemostatic cotton 25 is arranged inside the hollow seat 23.

[0028] When the patient is undergoing dialysis, the elasticity of the spring 27 is used to pull the hemostatic block 2 upward, so that the upper half of the hemostatic block 2 extends out of the interior of the frame 1. Since the internal movably connected to the mounting seat 12 is a movable rod, the baffle 11 and the limit plate 24 can swing movably. When the upper half of the hemostatic block 2 extends out of the interior of the frame 1, the limit plate 24 can be placed parallel to the baffle 11 and clamped on the outer surface of the frame 1. The rubber block 3 can be used to increase the friction between the limit plate 24 and the frame 1, so that a certain distance is formed between the hemostatic block 2 and the opening 17 of the frame 1, so that the needle for the patient's dialysis can extend into the interior of the frame 1 through the distance between the opening 17 and the hemostatic block 2 and be inserted into the patient's blood vessel for blood purification. The elasticity of the spring 27 is used again to make the hemostatic block 2 slightly squeeze the needle used for dialysis, so that the needle is not easy to shake.

[0029] The front surface of the frame 1 is slidably connected to a moving block 13, and the side surface of the moving block 13 is fixedly connected to an extrusion plate 16. The front surface of the frame 1 is provided with an opening 17, and the opening 17 is located behind the extrusion plate 16. The front surface of the moving block 13 is fixedly connected to a hollow tube 15, and a sealing ring 28 is provided inside the hollow tube 15. The inside of the hollow tube 15 is engaged with an insertion rod 14, and the front end surface of the insertion rod 14 is fixedly connected to a stopper 18. The rear end of the insertion rod 14 is provided with a second suction cup 29, and the second suction cup 29 is attracted to the inside of the frame 1. The hollow seat 23 and the extrusion plate 16 are both made of rubber, and the side surface of the limiting plate 24 is provided with a rubber block 3.

[0030] When the needle is squeezed by the hemostatic block 2, the sliding of the moving block 13 and the frame 1 can be used to push the two groups of moving blocks 13 in opposite directions, so that the squeezing plate 16 can fit the needle tube used by the needle and limit it. The insertion rod 14 passes through the hollow tube 15 and extends into the sliding part of the moving block 13. The sealing ring 28 can be used to fit the insertion rod 14 and the hollow tube 15 to increase the friction between the insertion rod 14 and the hollow tube 15, so that the sealing ring 28 can fill the gap generated at the fitting part of the insertion rod 14 and the hollow tube 15. By continuously pushing the insertion rod 14, it can squeeze the second suction cup 29, and the second suction cup 29 can be adsorbed on the sliding part of the moving block 13 to fix the moving block 13. The squeezing of the needle by the hemostatic block 2 and the limiting of the needle tube by the squeezing plate 16 can prevent the needle from shaking, thereby improving the stability of the needle inserted into the patient's blood vessel.

[0031] The side surface of the girdle 9 is provided with a pre-fixing band 10, and a part of the side surface of the pre-fixing band 10 extends out of the inside of the girdle 9. A round hole 4 is provided inside the pre-fixing band 10. A fastening block 8 is sleeved on the outer surface of the girdle 9. A groove 19 is provided inside the fastening block 8, and the girdle 9 is slidably connected to the inside of the groove 19. A ball 20 is movably connected to the inner wall of the groove 19. A rubber seat 22 is provided on the inner wall of the groove 19. A push rod 7 is fixedly connected to the front surface of the fastening block 8. A fitting seat 21 is provided on the upper surface of the fastening block 8. A hanging rod 6 is fixedly connected to the side surface of the fastening block 8, and the hanging rod 6 is sleeved and connected to the pre-fixing band 10 through the round hole 4. A rubber sleeve 5 is sleeved on the outer surface of the hanging rod 6.

[0032] Before the patient undergoes dialysis, the pre-fixing band 10 and the girdle 9 are worn on the patient's arm together. A part of the pre-fixing band 10 that extends out of the inside of the girdle 9 can be pulled to one side, so that the diameter between the girdles 9 can become smaller. The pre-fixing band 10 can be sleeved on the surface of the hanging rod 6 by using the round hole 4. When the round hole 4 is sleeved on the surface of the hanging rod 6 by using the rubber sleeve 5, the rubber sleeve 5 can expand the inside of the round hole 4 to fix the pre-fixing band 10, so that the device can be worn at the designated position on the patient's arm. After the patient finishes dialysis, the limiting plate 24 can be pulled upward to separate the rubber block 3 from the frame 1. The insertion rod 14 is pulled to be separated from the sliding part of the moving block 13. The needle is pulled out and the limiting plate 24 is released, so that the hemostatic block 2 can be elastically reset by the spring 27. The reset of the hemostatic block 2 can drive the hollow seat 23 and the first suction cup 26 to move downward together. The rubber material of the hollow seat 23 and the hemostatic cotton 25 can be timely attached to the needle hole on the patient's arm, so that the first suction cup 26 can adsorb on the skin around the needle hole. Pull the U-shaped part below the girdle 9, and use the push rod 7 to slide the fastening block 8 downward. The ball 20 can improve the sliding efficiency of the fastening block 8, and the rubber seat 22 is convenient for fixing the moving height of the fastening block 8. By continuously reducing the diameter of the girdle 9, the hemostatic block 2 can press the needle hole on the patient's arm, so as to timely press and stop bleeding the needle hole on the patient's arm.

[0033] In use, the pre-fixing band 10 and the strap 9 are worn on the patient's arm together. A part of the pre-fixing band 10 extending out of the inside of the strap 9 can be pulled to one side, so that the diameter between the straps 9 can be reduced. The pre-fixing band 10 can be sleeved on the surface of the hanging rod 6 through the circular hole 4. When the circular hole 4 is sleeved on the surface of the hanging rod 6 by using the rubber sleeve 5, the rubber sleeve 5 can expand the inside of the circular hole 4 to fix the pre-fixing band 10, so that the device can be worn at a specified position on the patient's arm. The elastic spring 27 is used to pull the hemostatic block 2 upward, so that the upper half of the hemostatic block 2 extends out of the inside of the frame 1. Since the movable rod is movably connected inside the mounting seat 12, the baffle 11 and the limiting plate 24 can swing movably. After the upper half of the hemostatic block 2 extends out of the inside of the frame 1, the limiting plate 24 and the baffle 11 can be placed parallel and clamped on the outer surface of the frame 1. The rubber block 3 can increase the friction between the limiting plate 24 and the frame 1, so that a certain distance is formed between the hemostatic block 2 and the opening 17 of the frame 1. The dialysis needle of the patient can extend into the inside of the frame 1 through the distance between the opening 17 and the hemostatic block 2 and be inserted into the patient's blood vessel for blood purification. By sliding the two moving blocks 13 and the frame 1, the two moving blocks 13 can be pushed in opposite directions, so that the pressing plate 16 can fit and limit the syringe tube used by the needle. The inserting rod 14 penetrates through the hollow tube 15 and extends into the sliding part of the moving block 13. The sealing ring 28 can increase the friction between the inserting rod 14 and the hollow tube 15 for the engagement of the inserting rod 14 and the hollow tube 15, so that the sealing ring 28 can fill the gap generated at the engagement part of the inserting rod 14 and the hollow tube 15. By continuously pushing the inserting rod 14, the second suction cup 29 can be extruded, and the second suction cup 29 can adsorb on the sliding part of the moving block 13 to fix the moving block 13. Cooperating with the extrusion of the hemostatic block 2 on the needle and the limitation of the pressing plate 16 on the syringe tube, when the patient's dialysis is completed, the limiting plate 24 can be pulled upward to separate the rubber block 3 from the frame 1, the inserting rod 14 is pulled to separate from the sliding part of the moving block 13, the needle is pulled out, the limiting plate 24 is released, and the hemostatic block 2 can be reset by the elasticity of the spring 27. The reset of the hemostatic block 2 can drive the hollow seat 23 and the first suction cup 26 to move downward together. The rubber material of the hollow seat 23 and the hemostatic cotton 25 can timely fit the needle hole on the patient's arm, so that the first suction cup 26 can adsorb on the skin around the needle hole. Pull the U-shaped part below the strap 9, and use the push rod 7 to slide the fastening block 8 downward. The ball 20 can improve the sliding efficiency of the fastening block 8, and the rubber seat 22 is convenient for fixing the moving height of the fastening block 8. By continuously reducing the diameter of the strap 9, the hemostatic block 2 can press the needle hole on the patient's arm.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A nursing device for assisting in blood purification, comprising a band (9), characterized in that: The upper surface of the strap (9) is provided with a frame (1). A spring (27) is fixedly connected to the inner wall of the frame (1). One end of the spring (27) away from the frame (1) is fixedly connected to a hemostatic block (2). An installation seat (12) is fixedly connected to the upper surface of the hemostatic block (2). A baffle (11) is movably connected to the side surface of the installation seat (12). A limiting plate (24) is fixedly connected to the side surface of the baffle (11), and the limiting plate (24) is in contact with the outer surface of the frame (1). A first suction cup (26) is arranged on the lower surface of the hemostatic block (2). A hollow seat (23) is arranged on the lower surface of the hemostatic block (2). Hemostatic cotton (25) is arranged inside the hollow seat (23).

2. The nursing device for assisting blood purification according to claim 1, wherein: A moving block (13) is slidably connected to the front surface of the frame (1). An extrusion plate (16) is fixedly connected to the side surface of the moving block (13). An opening (17) is provided on the front surface of the frame (1), and the opening (17) is located behind the extrusion plate (16).

3. The nursing device for assisting blood purification according to claim 2, characterized in that: A hollow tube (15) is fixedly connected to the front surface of the moving block (13). A sealing ring (28) is arranged inside the hollow tube (15).

4. A nursing device for assisting in blood purification according to claim 3, characterized in that: A plug rod (14) is fitted and connected inside the hollow tube (15). A stop block (18) is fixedly connected to the front end surface of the plug rod (14). A second suction cup (29) is arranged at the rear end of the plug rod (14), and the second suction cup (29) is attracted to the inside of the frame (1).

5. A nursing device for assisting in blood purification according to claim 1, characterized in that: A pre-fixing strap (10) is arranged on the side surface of the strap (9), and the side surface of the pre-fixing strap (10) extends out of the inside of the strap (9). A round hole (4) is provided inside the pre-fixing strap (10).

6. The nursing device for assisting blood purification according to claim 1, wherein: A fastening block (8) is sleeved on the outer surface of the strap (9). A groove (19) is provided inside the fastening block (8), and the strap (9) is slidably connected to the inside of the groove (19).

7. The nursing device for assisting blood purification according to claim 6, characterized in that: A ball (20) is movably connected to the inner wall of the groove (19). A rubber seat (22) is arranged on the inner wall of the groove (19).

8. The nursing device for assisting blood purification according to claim 6, characterized in that: A push rod (7) is fixedly connected to the front surface of the fastening block (8). A fitting seat (21) is arranged on the upper surface of the fastening block (8).

9. The nursing device for assisting blood purification according to claim 6, characterized in that: A hanging rod (6) is fixedly connected to the side surface of the fastening block (8), and the hanging rod (6) is sleeved and connected to the pre-fixing strap (10) through the round hole (4). A rubber sleeve (5) is sleeved on the outer surface of the hanging rod (6).

10. The nursing device for assisting blood purification according to claim 1, characterized in that: Both the hollow seat (23) and the extrusion plate (16) are made of rubber. A rubber block (3) is arranged on the side surface of the limiting plate (24).

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