A kind of glucosamine chondroitin sampling device

Abstract

The invention discloses a glucosamine chondroitin sampling device, belonging to the technical field of glucosamine chondroitin sampling, comprising: a main pipe, which is a cylindrical pipe with an open end, and a hoop sleeve is installed at the open end of the main pipe; a main shaft, which is installed inside the main pipe; a sampling frame, which is fixedly installed on the main shaft; a receiving tank, which is plugged into a through-hole opened on the main pipe; a baffle, which is installed on an end surface of the main shaft close to the open end of the main pipe; and a cleaning part, which is installed on the main shaft; wherein, driven by a driving part, the main shaft reciprocates inside the main pipe, and when the sampling frame moves to just above the open end of the receiving tank, the main shaft rotates one circle; the cleaning part only reciprocates inside the main pipe following the main shaft, and the powder remaining on the inner annular surface of the main pipe can be cleaned at each sampling, thereby preventing the residue from affecting the accuracy of the next sampling.

Description

Technical Field

[0001] The invention relates to the technical field of glucosamine chondroitin sampling, and in particular to a glucosamine chondroitin sampling device. Background Art

[0002] Glucosamine chondroitin needs to be refined during the production process, and after refining, the glucosamine chondroitin is generally in powder form; the refined glucosamine chondroitin needs to be sampled and tested, so that the quality of the produced glucosamine chondroitin can be tested. At present, some samplers are installed on the outside of the conveying pipeline, and samples inside the conveying pipeline are sampled through a sampling port opened on the side wall of the conveying pipeline, thereby ensuring the randomness of sampling. During the sampling process, the sample needs to be poured into a container for receiving the sample. It is easy for part of the sample to remain around the opening of the container for receiving the sample due to the pouring action. These residues will not only affect the accuracy of the next sampling, but may also contaminate new samples, resulting in mutual interference between the extracted samples. In order to solve the above problems, the present invention provides a glucosamine chondroitin sampling device. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a glucosamine chondroitin sampling device, which can clean the powder remaining on the inner ring surface of the main tube each time sampling is performed, thereby preventing the residue from affecting the accuracy of the next sampling.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a glucosamine chondroitin sampling device, comprising:

[0005] A main pipe, which is a cylindrical pipe with one end open, and a hoop is installed at the open end of the main pipe;

[0006] A main shaft, the main shaft is installed inside the main pipe and driven by a driving part installed inside the main pipe;

[0007] A sampling frame, the sampling frame is fixedly mounted on the side surface of one end of the main shaft close to the opening end of the main pipe;

[0008] A receiving tank, the receiving tank is inserted into a through hole opened on the main pipe;

[0009] A baffle, the baffle being mounted on an end surface of the main shaft close to an opening end of the main pipe;

[0010] A cleaning unit, wherein the cleaning unit is mounted on the main shaft;

[0011] Wherein, under the drive of the driving unit, the main shaft reciprocates inside the main pipe, and when the sampling frame moves to the top of the opening end of the receiving tank, the main shaft rotates one circle;

[0012] The cleaning part only reciprocates inside the main pipe following the main shaft, and when the cleaning part moves toward the opening end of the main pipe, the size of the cleaning part is smaller than the inner diameter of the main pipe, and when the cleaning part moves away from the opening end of the main pipe, the cleaning part presses against the inner annular surface of the main pipe.

[0013] Preferably, the cleaning unit comprises:

[0014] A base plate, the base plate is rotatably mounted on the main shaft, a groove is formed on the outer ring surface of the base plate below the main shaft axis, an empty groove is formed on one side surface of the base plate close to the opening end of the main pipe, and the empty groove is connected to the groove through a plurality of connecting ports;

[0015] An elastic membrane, wherein the elastic membrane is fixedly connected to the opening of the groove;

[0016] A piston plate, the piston plate is slidably mounted inside the empty slot, an expansion rod is fixedly connected to one side of the piston plate close to the opening end of the main pipe, and a contraction rod is fixedly connected to one side of the piston plate close to the side wall of the bottom of the empty slot, and the contraction rod passes through the piston plate and extends to the outside of the piston plate;

[0017] A first fixing plate, which is fixedly connected to the inner annular surface of the main pipe and is located on a side of the base plate close to the opening end of the main pipe;

[0018] A second fixing plate, the second fixing plate is fixedly connected to the inner annular surface of the main pipe and is located on a side of the base plate away from the opening end of the main pipe;

[0019] In the process that the base plate moves in a direction away from the opening end of the main pipe, the elastic film expands and presses against the inner annular surface of the main pipe.

[0020] Preferably, an elastic arc plate is fixedly connected to the outer annular surface of the elastic membrane, and the elastic arc plate is a hollow structure and communicates with the groove;

[0021] The opening end of the receiving tank protrudes from the inner annular surface of the main pipe, and the end surface of the opening end of the receiving tank is an inclined surface with a high middle and low surroundings. The opening end of the receiving tank is interference-fitted with a through opening opened on the main pipe.

[0022] Preferably, the communication port is provided on the groove wall of the hollow groove and is close to one end of the groove bottom of the hollow groove, and the diameter of the communication port is smaller than the thickness of the piston plate.

[0023] Preferably, a conical sealing film is connected between the base plate and the second fixing plate, and the sealing film is made of elastic material.

[0024] Preferably, a waste discharge port is provided on a side of the second fixing plate close to the open end of the main pipe and on the side wall of the main pipe, a waste collecting frame is provided outside the waste discharge port, and the waste collecting frame is movably connected to the main pipe.

[0025] Preferably, the waste outlet is located at a side away from the opening end of the main pipe, and a convex ring is fixedly connected to the inner annular surface of the main pipe.

[0026] Preferably, the driving unit comprises:

[0027] A rotary motor, the rotary motor is installed inside the main pipe, a square rod is fixedly connected to the motor shaft of the rotary motor, and a square groove matching the square rod is opened on the main shaft;

[0028] A plurality of reciprocating motors are installed inside the main pipe, and a screw is fixedly connected to the motor shaft of the reciprocating motor, and the screw is meshedly connected with a rotating ring rotatably installed on the main shaft.

[0029] Preferably, a limiting rod matched with the screw rod is fixedly connected to the base plate, and a limiting groove matched with the limiting rod is formed on the screw rod.

[0030] The beneficial effects of the present invention are:

[0031] The present invention realizes that the elastic membrane is in a contraction stage during the process of the substrate sliding toward the opening end of the main tube through the arrangement of the substrate and the elastic membrane, and at this time the elastic membrane does not contact the inner annular surface of the main tube; when the substrate moves in a direction away from the opening end of the main tube, the elastic membrane is in an expansion state and presses against the inner annular surface of the main tube, so that the powder remaining on the inner annular surface of the main tube due to pouring can be scraped into the interior of the waste collection frame, thereby avoiding mutual interference between the extracted samples.

[0032] The present invention achieves the separation of the space at the sampling position from the external space by installing a sealing film between the second fixing plate and the base plate, thereby preventing dust in the external air from contaminating the sample and affecting the sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic structural diagram of a glucosamine chondroitin sampling device provided in an embodiment of the present invention.

[0035] Figure 2 It is a schematic diagram of the sampling state of the present invention.

[0036] Figure 3 This is a schematic diagram of the structure in which the baffle of the present invention is located inside the main pipe.

[0037] Figure 4 It is a cross-sectional view of the present invention.

[0038] Figure 5 For the present invention Figure 4 Enlarged view of point A.

[0039] Figure 6 It is a schematic diagram of the installation of the main shaft and the base plate of the present invention.

[0040] Figure 7 It is a cross-sectional view of the main shaft and the screw of the present invention.

[0041] Figure 8 It is a schematic diagram of the structure of the groove and the empty slot of the present invention.

[0042] Description of reference numerals:

[0043] 1. main pipe, 2. hoop, 3. main shaft, 4. sampling frame, 5. receiving tank, 6. baffle, 7. base plate, 8. groove, 9. empty slot, 10. elastic membrane, 11. piston plate, 12. expansion rod, 13. contraction rod, 14. first fixed plate, 15. second fixed plate, 16. connecting port, 17. sealing membrane, 18. waste discharge port, 19. waste collection frame, 20. rotary motor, 21. square rod, 22. square slot, 23. reciprocating motor, 24. screw, 25. swivel, 26. limit rod, 27. limit slot, 28. elastic arc plate, 29. convex ring. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The present invention provides a glucosamine chondroitin sampling device, such as Figures 1 to 8 shown.

[0046] Embodiment 1:

[0047] A glucosamine chondroitin sampling device comprises a main pipe 1, which is cylindrical with an open end, and is installed on an external conveying pipeline through a hoop 2 fixedly installed thereon, and a sampling port corresponding to the open end of the main pipe 1 is opened on the external conveying pipeline, a main shaft 3 is installed inside the main pipe 1, a sampling frame 4 is fixedly installed on the side wall of one end of the main shaft 3 close to the open end of the main pipe 1, a through-port is installed on the side of the main pipe 1, a receiving tank 5 is installed inside the through-port, and the open end of the receiving tank 5 is plugged into the inside of the through-port, a baffle 6 is fixedly installed on the end surface of the main shaft 3 close to the open end of the main pipe 1, and when no sampling is done, the baffle 6 can block the open end of the main pipe 1 to prevent powder from entering the inside of the main pipe 1.

[0048] The main shaft 3 is driven by a driving unit installed inside the main pipe 1 to drive the sampling frame 4 to perform sampling. When performing sampling, the main shaft 3 will first reciprocate along the axial direction of the main pipe 1, and then rotate one circle (i.e., rotate 360 ​​degrees). Before sampling, the sampling frame 4 is located directly above the opening end of the receiving tank 5. When sampling is performed under the action of the driving unit, the sampling frame 4 will be driven to move in the direction of the opening end of the main pipe 1, and extend into the inside of the conveying pipe through the opening on the main pipe 1 and the sampling port opened on the external conveying pipe to take samples. After the sampling frame 4 moves into the conveying pipe, it will stay for a certain time (e.g., 1 second), and then the main shaft 3 will drive the sampling frame 4 to move back to the position before sampling (i.e., the sampling frame 4 moves to directly above the opening end of the receiving tank 5), and then the main shaft 3 drives the sampling frame 4 to rotate one circle, so that the sample inside the sampling frame 4 can be poured into the inside of the receiving tank 5, and the opening of the sampling frame 4 is facing upwards, in preparation for the next sampling work. After each sampling work is completed, a new receiving tank 5 can be replaced.

[0049] A cleaning part is installed on the main shaft 3. The cleaning part will move with the main shaft 3 during the reciprocating motion of the main shaft 3. When the main shaft 3 rotates, the cleaning part will not rotate with the main shaft 3. When the cleaning part moves toward the open end of the main pipe 1, the diameter of the cleaning part is smaller than the inner diameter of the main pipe 1, and the cleaning part will not contact the inner wall of the main pipe 1. When the cleaning part moves away from the open end of the main pipe 1, the cleaning part will press against the inner annular surface of the main pipe 1 to clean the powder remaining on the inner annular surface of the main pipe 1 located around the open end of the receiving tank 5.

[0050] A waste discharge port 18 is provided on the main pipe 1, and a waste collecting frame 19 is provided on the outer side of the waste discharge port 18. The waste collecting frame 19 is movably connected to the main pipe 1. The shape of the waste collecting frame 19 is arc-shaped. The opening size of the waste collecting frame 19 is designed to be slightly smaller than the diameter of the main pipe 1 to achieve interference fit installation. When the cleaning part moves in a direction away from the open end of the main pipe 1, the residue on the inner annular surface of the main pipe 1 can be scraped into the interior of the waste collecting frame 19 to complete the cleaning of the residue.

[0051] Embodiment 2:

[0052] The cleaning part includes a substrate 7, which is rotatably mounted on the main shaft 3 through an annular protrusion fixedly connected to the main shaft 3, and can move synchronously with the main shaft 3 when the main shaft 3 reciprocates along the axis of the main pipe 1. A groove 8 is provided on the outer ring surface of the substrate 7 below the axis of the main shaft 3, and an empty groove 9 is provided on one side surface of the substrate 7 close to the open end of the main pipe 1. A connecting port 16 is provided on the groove wall of the empty groove 9 at one end close to the bottom of the empty groove 9. The empty groove 9 is connected with the groove 8 through the connecting port 16. An elastic membrane 10 is fixedly connected at the groove opening of the groove 8 and located on the outer ring surface of the substrate 7. An elastic arc plate 28 is fixedly connected to the elastic membrane 10. The elastic arc plate 28 is a hollow structure and is connected to the groove 8. A piston plate 11 is slidably mounted inside the empty groove 9, and an expansion rod 12 is fixedly connected to a side surface of the piston plate 11 close to the open end of the main pipe 1, and a contraction rod 13 is fixedly connected to a side surface of the piston plate 11 close to the side wall of the bottom of the empty groove 9. The contraction rod 13 passes through the substrate 7 and extends to the outside of the substrate 7.

[0053] A first fixing plate 14 is fixedly connected to the inner surface of the main pipe 1 and the side of the substrate 7 close to the opening end of the main pipe 1 . A second fixing plate 15 is fixedly connected to the inner surface of the main pipe 1 and the side of the substrate 7 away from the opening end of the main pipe 1 .

[0054] When the base plate 7 moves toward the open end of the main pipe 1 until the base plate 7 hits the first fixed plate 14, under the action of the first fixed plate 14 and the expansion rod 12, the piston plate 11 moves toward the bottom of the empty groove 9 and fits with the side wall of the bottom of the empty groove 9. At this time, the contraction rod 13 protrudes from the base plate 7, and the air inside the empty groove 9 enters the interior of the groove 8 through the connecting port 16, so that the elastic membrane 10 and the elastic arc plate 28 can be expanded. After inflation, the shape of the elastic arc plate 28 remains fixed and fits tightly against the inner annular surface of the main pipe 1. When the base plate 7 hits the first fixed plate 14, it means that the sampling frame 4 moves to the sampling position inside the external conveying pipeline.

[0055] The thickness of the piston plate 11 is greater than the diameter of the connecting port 16. When the piston plate 11 fits against the bottom of the empty groove 9, the outer ring surface of the piston plate 11 will block the connecting port 16. Since the movement direction of the piston plate 11 and the pressure exerted on the piston plate 11 by the air pressure inside the groove 8 are perpendicular to each other, the piston plate 11 can stably seal the connecting port 16.

[0056] After the sampling frame 4 moves to the sampling position for a certain period of time (for example, 1 second), the main shaft 3 will drive the substrate 7 to move in the direction away from the open end of the main tube 1. At this time, the elastic arc plate 28 presses against the inner ring surface of the main tube 1 and scrapes off the powder on the inner ring surface of the main tube 1. When the elastic arc plate 28 moves to the top of the waste outlet 18, the substrate 7 will contact the second fixed plate 15. Under the action of the second fixed plate 15, the contraction rod 13 is pressed tightly and drives the piston plate 11 to move in the direction away from the bottom of the empty groove 9. At this time, under the elastic force of the elastic membrane 10 itself, the air inside the groove 8 will enter the inside of the empty groove 9, and the elastic membrane 10 and the elastic arc plate 28 will shrink. The elastic arc plate 28 will move in the direction away from the bottom of the empty groove 9. After contraction, elastic deformation can be generated. When the elastic arc plate 28 moves to the top of the waste outlet 18, it will press against the convex ring 29. The convex ring 29 is fixedly connected to the inner ring surface of the main pipe 1, and the convex ring 29 is located on the side of the waste outlet 18 away from the opening end of the main pipe 1. At this time, due to the contraction of the elastic membrane 10 and the elastic arc plate 28, the height of the side of the elastic arc plate 28 pressing against the convex ring 29 will be lower than the height of the side of the elastic arc plate 28 connected to the elastic membrane 10. When sampling next time, the elastic arc plate 28 will move in the direction away from the convex ring 29. At this time, the sample on the elastic arc plate 28 will fall into the inside of the waste collection frame 19 to prevent the elastic arc plate 28 from driving the sample back to its original position.

[0057] The opening end of the receiving tank 5 protrudes from the inner annular surface of the main pipe 1, and the end surface of the opening end of the receiving tank 5 is a slope that is high in the middle and low around (such as Figure 5 As shown in the figure, the opening end of the receiving tank 5 and the through-hole opened on the main pipe 1 are in an interference fit relationship. When the elastic arc plate 28 scrapes and pushes the powder on the inner annular surface of the main pipe 1 to move, it will press against the inclined surface of the opening end of the receiving tank 5. Under the blocking effect of the opening end of the receiving tank 5, the powder will move to the elastic arc plate 28. Then, under the pressing effect of the elastic arc plate 28, the receiving tank 5 will move downward until the opening end of the receiving tank 5 and the inner annular surface of the main pipe 1 overlap with each other, so that the elastic arc plate 28 can move smoothly to the top of the waste outlet 18.

[0058] A conical sealing membrane 17 is connected between the substrate 7 and the second fixed plate 15. The sealing membrane 17 is made of an elastic material (such as rubber). One end of the sealing membrane 17 is fixedly connected to the second fixed plate 15, and the other end is fixedly connected to the substrate 7. The sealing membrane can separate the space of the sampling position from the external space to prevent dust in the external air from contaminating the sample.

[0059] Embodiment three:

[0060] The driving part includes a rotary motor 20 and multiple reciprocating motors 23. The rotary motor 20 and the reciprocating motors 23 are both installed inside the main pipe 1. A square rod 21 is fixedly connected to the motor shaft of the rotary motor 20. The main shaft 3 is slidably connected to the square rod 21 through a square groove 22 provided thereon. The rotary motor 20 will not affect the reciprocating motion of the main shaft 3 inside the main pipe 1 along the axis of the main pipe 1. The rotation of the motor shaft of the rotary motor 20 can drive the main shaft 3 to rotate.

[0061] A screw 24 is fixedly connected to the motor shaft of the reciprocating motor 23, and the screw 24 is meshed and connected with a swivel 25 rotatably installed on the main shaft 3. The swivel 25 is rotatably connected to the swivel 25 via a fixed ring fixedly connected to the main shaft 3. The rotation of the motor shaft of the reciprocating motor 23 can drive the screw 24 to rotate, so that the main shaft 3 can be driven to reciprocate inside the main pipe 1 along the axis of the main pipe 1 through the swivel 25, and then the main shaft 3 can be driven to reciprocate inside the main pipe 1 along the axis of the main pipe 1 without affecting the rotation of the main shaft 3.

[0062] A limiting rod 26 is fixedly connected to the base plate 7, and a limiting groove 27 adapted to the limiting rod 26 is provided on the screw rod 24. The limiting rod 26 is cylindrical and concentric with the screw rod 24. The limiting rod 26 can support the screw rod 24 without affecting the rotation of the screw rod 24, thereby driving the main shaft 3 to move.

[0063] 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. A glucosamine chondroitin sampling device, characterized in that: include: A main pipe (1), wherein the main pipe (1) is cylindrical and has an open end, and a hoop (2) is installed at the open end of the main pipe (1); A main shaft (3), the main shaft (3) being installed inside the main pipe (1) and driven by a driving unit installed inside the main pipe (1); A sampling frame (4), the sampling frame (4) being fixedly mounted on a side surface of one end of the main shaft (3) close to the opening end of the main pipe (1); A receiving tank (5), wherein the receiving tank (5) is inserted into a through hole provided on the main pipe (1); a baffle (6), the baffle (6) being mounted on an end surface of the main shaft (3) close to an opening end of the main pipe (1); A cleaning unit, the cleaning unit being mounted on the main shaft (3); Wherein, under the drive of the driving unit, the main shaft (3) reciprocates inside the main pipe (1), and when the sampling frame (4) moves to the position just above the opening end of the receiving tank (5), the main shaft (3) rotates one circle; The cleaning part only follows the main shaft (3) to reciprocate inside the main pipe (1), and when the cleaning part moves in the direction of the opening end of the main pipe (1), the size of the cleaning part is smaller than the inner diameter of the main pipe (1), and when the cleaning part moves in the direction away from the opening end of the main pipe (1), the cleaning part is pressed against the inner annular surface of the main pipe (1); The cleaning unit comprises: A base plate (7), the base plate (7) being rotatably mounted on the main shaft (3), a groove (8) being provided on an outer ring surface of the base plate (7) located below the axis of the main shaft (3), an empty groove (9) being provided on a side surface of the base plate (7) close to the opening end of the main pipe (1), the empty groove (9) being connected to the groove (8) via a plurality of communication ports (16); An elastic membrane (10), the elastic membrane (10) being fixedly connected to the opening of the groove (8); A piston plate (11), wherein the piston plate (11) is slidably mounted inside the empty groove (9), an expansion rod (12) is fixedly connected to a side surface of the piston plate (11) close to the opening end of the main pipe (1), and a contraction rod (13) is fixedly connected to a side surface of the piston plate (11) close to the side wall of the bottom of the empty groove (9), and the contraction rod (13) passes through the piston plate (11) and extends to the outside of the piston plate (11); A first fixing plate (14), the first fixing plate (14) being fixedly connected to the inner annular surface of the main pipe (1) and being located on a side of the base plate (7) close to the opening end of the main pipe (1); A second fixing plate (15), the second fixing plate (15) being fixedly connected to the inner annular surface of the main pipe (1) and being located on a side of the base plate (7) away from the opening end of the main pipe (1); In the process of the base plate (7) moving in a direction away from the open end of the main pipe (1), the elastic membrane (10) expands and presses against the inner annular surface of the main pipe (1); An elastic arc plate (28) is fixedly connected to the outer annular surface of the elastic membrane (10), and the elastic arc plate (28) is a hollow structure and communicates with the groove (8); The opening end of the receiving tank (5) protrudes from the inner annular surface of the main pipe (1); the end surface of the opening end of the receiving tank (5) is an inclined surface with a high middle and low surroundings; the opening end of the receiving tank (5) is interference fit with the through opening opened on the main pipe (1).

2. A glucosamine chondroitin sampling device as claimed in claim 1, characterized in that: The communication opening (16) is formed on the groove wall of the hollow groove (9) and is close to one end of the groove bottom of the hollow groove (9). The diameter of the communication opening (16) is smaller than the thickness of the piston plate (11).

3. A glucosamine chondroitin sampling device as claimed in claim 1, characterized in that: A conical sealing film (17) is connected between the base plate (7) and the second fixing plate (15), and the sealing film (17) is made of an elastic material.

4. A glucosamine chondroitin sampling device as claimed in claim 1, characterized in that: A waste discharge port (18) is provided on one side of the second fixing plate (15) close to the open end of the main pipe (1) and on the side wall of the main pipe (1). A waste collection frame (19) is provided outside the waste discharge port (18). The waste collection frame (19) is movably connected to the main pipe (1).

5. A glucosamine chondroitin sampling device as claimed in claim 4, characterized in that: The waste outlet (18) is located at a side away from the open end of the main pipe (1), and is fixedly connected to a convex ring (29) on the inner annular surface of the main pipe (1).

6. A glucosamine chondroitin sampling device as claimed in claim 1, characterized in that: The driving unit comprises: A rotary motor (20), the rotary motor (20) being installed inside the main pipe (1), a square rod (21) being fixedly connected to the motor shaft of the rotary motor (20), and a square groove (22) matching the square rod (21) being formed on the main shaft (3); A plurality of reciprocating motors (23) are installed inside the main pipe (1), and a screw (24) is fixedly connected to the motor shaft of the reciprocating motor (23), and the screw (24) is meshedly connected to a rotating ring (25) rotatably installed on the main shaft (3).

7. A glucosamine chondroitin sampling device as claimed in claim 6, characterized in that: A limiting rod (26) matched with the screw rod (24) is fixedly connected to the base plate (7), and a limiting groove (27) matched with the limiting rod (26) is formed on the screw rod (24).

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