A testing device for ink

Abstract

The invention discloses an ink detection device, comprising a needle tube, a piston rod is slidably arranged in the needle tube, and a needle is installed at one end of the needle tube; a sleeve is arranged on the outer sleeve of the needle tube, a sliding groove is arranged on the outer side wall of the end of the sleeve close to the needle, a protective tube is slidably arranged on the sleeve through the sliding groove, a blocking assembly is arranged on the end of the protective tube away from the sleeve, a circular ring is slidably arranged on the end of the protective tube away from the sleeve, and a transmission connection is provided between the circular ring and the blocking assembly. When the circular ring moves toward the protective tube, the circular ring drives the blocking assembly to move toward the circular ring and open. Through the coordinated use of the protective tube and the blocking assembly, the protective tube slides on the sleeve toward the direction of the needle to wrap the needle inside, and the end opening of the protective tube is blocked by the blocking assembly, so that the needle is in a relatively sealed environment, thereby keeping the needle clean and preventing dust in the external environment from adhering to the needle.

Description

Technical Field

[0001] The invention relates to the technical field of ink detection, in particular to an ink detection device. Background Art

[0002] Gas chromatographs are often used in ink testing, sometimes referred to as "gas chromatographs". Gas chromatographs are analytical instruments used to separate and analyze gases or volatile liquid compounds. In ink testing, they are used to analyze volatile organic compounds, solvent residues, additives and other components in inks. Gas chromatographs generally include an injection system: used to introduce samples into the chromatographic column, including an injection port, an injection needle, etc.; a chromatographic column: the chromatographic column is the core component of the gas chromatograph and is used to separate the components in a mixture; a carrier gas system: provides a stable flow of carrier gas, such as helium, nitrogen, hydrogen, etc., and the carrier gas carries the sample through the chromatographic column; a detector: used to detect the components flowing out of the chromatographic column, such as a flame ionization detector, a thermal conductivity detector, an electron capture detector, a mass spectrometer, etc.

[0003] Chinese Patent Publication No.: CN114705795A discloses an instrument sampling device for a new type of gas chromatograph used as a detection device for ink, including a syringe, a push rod is movably arranged inside the syringe, the push rod can be moved upward to extract liquid, and the push rod can be moved downward to release liquid, the lower end of the syringe is fixedly connected to a liquid outlet cylinder, the lower end of the liquid outlet cylinder is threadedly mounted with a needle, the outer wall of the liquid outlet cylinder is clamped with a limiting cylinder through a fixing component, and the position of the limiting cylinder on the liquid outlet cylinder is adjustable, and the lower end of the limiting cylinder is connected to a positioning sleeve.

[0004] In the prior art, the sampling needle absorbs the sample through the needle head and then injects it through the injection port for detection. It should be noted that the needle head should be kept clean before and after sampling, so that the sampling needle will not contain impurities or dust when absorbing the sample during sampling, thereby maintaining the purity of the sample. However, in actual use, the outside of the needle head may be attached with impurities such as dust due to long-term exposure to the outside. After the needle head is inserted into the sample to take the sample, in the process of combining the needle head with the injection port to inject the sample, since there will be sample attached to the needle head, dust and other pollutant particles in the external environment are very likely to adhere to the outside of the needle head. Therefore, when the needle head is subsequently combined with the injection port, the dust and other impurities on the outside of the needle head are also easy to enter the detection equipment, thereby affecting the accuracy of the detection data.

[0005] Therefore, it is necessary to provide an ink detection device to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide an ink detection device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ink detection device, comprising a needle tube, a piston rod is slidably arranged in the needle tube, and a needle is installed at one end of the needle tube; a sleeve is provided on the outer periphery of the needle tube, a sliding groove is provided on the outer side wall of the sleeve at one end close to the needle, a protective tube is slidably installed on the sleeve through the sliding groove, a sealing assembly is provided on the end of the protective tube away from the sleeve, a ring is slidably arranged on the end of the protective tube away from the sleeve, the ring and the sealing assembly are transmission-connected, and when the ring moves toward the protective tube, the ring drives the sealing assembly to move toward the ring and open.

[0008] As a further solution of the present invention: a groove is arranged in the end of the slide close to the needle, a slide plate symmetrically arranged on the inner wall of the protection tube is slidably connected to the slide groove, and a second protrusion slidably adapted to the groove is slidably arranged on the end of the slide close to the sleeve.

[0009] As a further solution of the present invention: the sealing assembly includes a sealing plate; a circular hole for the needle to pass through is set at the center of the end of the protective tube away from the sleeve, the sealing plate is slidably set in the side wall of the end of the protective tube away from the sleeve, and the sealing plate is symmetrically set along the center of the protective tube, and a second pull rope is fixedly set between the sealing plate and the circular ring, and the circular hole is sealed when the two sets of sealing plates move and fit together.

[0010] As a further solution of the present invention: a fixing rod is symmetrically fixed along the center at one end of the circular ring close to the sleeve, a wedge block is fixedly provided at one end of the fixing rod away from the circular ring, a trigger plate is fixedly provided at one end of the second protrusion close to the circular ring, the trigger plate and the wedge block are slidably matched, through grooves are provided in the side walls of the slide plate and the protective tube, and the fixing rod is slidably provided in the through grooves.

[0011] As a further solution of the present invention: a limiting groove is arranged in the end of the slide groove away from the needle, a first protrusion is slidably arranged on the end of the slide plate close to the limiting groove, a third pull rope is fixedly arranged between the first protrusion and the second protrusion, the first protrusion and the limiting groove are slidably matched, and the first protrusion is arranged on the side of the second protrusion away from the ring.

[0012] As a further solution of the present invention: a fixed disk is fixedly arranged in the protective tube, and the fixed disk is arranged in the end of the protective tube away from the needle tube. A mounting block is slidably arranged in the fixed disk, and the mounting block is symmetrically arranged along the center of the fixed disk. Absorbent cotton is fixedly arranged on the side of the mounting block close to the circular hole, and a telescopic tube is fixedly arranged on the side of the mounting block away from the absorbent cotton.

[0013] As a further solution of the present invention: baffles are arranged on both sides of one end of the sealing plate close to the circular ring, an airbag is fixedly arranged on the end of the baffle away from the sealing plate, a connecting tube is arranged on the end of the airbag away from the baffle, and the end of the connecting tube away from the airbag is connected to the telescopic tube, and the baffle, airbag and connecting tube are all arranged inside the side wall of the protective tube.

[0014] As a further solution of the present invention: a limiting post is rotatably provided at one end of the sleeve away from the needle, and a matching plate is slidably provided inside one end of the limiting post close to the needle tube.

[0015] As a further solution of the present invention: an annular groove is arranged in an array on the piston rod, and the annular groove is slidably matched with the matching plate.

[0016] As a further solution of the present invention: a movable block is elastically arranged in the groove, and a first pull rope is fixedly arranged at one end of the movable block close to the groove. The first pull rope slides through the side wall of the sleeve and the limiting column and is fixedly connected to the matching plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: through the coordinated use of the protective tube and the blocking assembly, the protective tube slides on the sleeve toward the needle to wrap the needle inside, and the end opening of the protective tube is blocked by the blocking assembly, so that the needle is in a relatively sealed environment, thereby keeping the needle clean and preventing dust in the external environment from adhering to the needle. Through the coordination of the second protrusion and the groove, the relative position of the protective tube and the sleeve is restricted, so that the protective tube cannot move on the sleeve, thereby protecting the needle, and cooperating with the sleeve to protect the sampling needle, avoiding the problem of the sampling needle falling and being damaged during taking or transportation, and at the same time, the protective tube prevents external dust from adhering to the needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the blocking component in the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the sleeve in the present invention.

[0021] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at A in the middle.

[0022] Figure 5 It is a schematic diagram of the structure of the slide groove and the limit groove in the present invention.

[0023] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in the figure.

[0024] Figure 7 It is a schematic structural diagram of the matching plate and the annular groove in the present invention.

[0025] Figure 8 It is a schematic structural diagram of the telescopic tube, the mounting block and the absorbent cotton in the present invention.

[0026] Fig. 9 It is a schematic structural diagram of the first protrusion and the second protrusion in the present invention.

[0027] Fig.10 It is a schematic diagram of the structure of the airbag and the connecting tube in the present invention.

[0028] Fig.11 For the present invention Fig. 9 Schematic diagram of the structure at C in the middle.

[0029] In the figure: 1. needle tube; 2. needle; 3. piston rod; 4. sleeve; 5. protective tube; 6. ring; 7. sealing plate; 8. slide groove; 9. limit column; 10. limit groove; 11. baffle; 12. annular groove; 13. movable block; 14. groove; 15. first pull rope; 16. matching plate; 17. second pull rope; 18. slide plate; 19. fixing rod; 20. through groove; 21. fixing plate; 22. telescopic tube; 23. mounting block; 24. absorbent cotton; 25. first protruding column; 26. second protruding column; 27. trigger plate; 28. third pull rope; 29. ​​wedge block; 30. air bag; 31. connecting tube. DETAILED DESCRIPTION

[0030] See also Figure 1-Figure 11 In an embodiment of the present invention, an ink detection device includes a needle tube 1, a piston rod 3 is slidably arranged in the needle tube 1, and a needle 2 is installed at one end of the needle tube 1; when in use, the needle 2 is inserted into the ink to be sampled, and then the piston rod 3 is pulled, and the needle 2 absorbs the sample ink through the negative pressure generated between the piston rod 3 and the needle tube 1, and then the sample ink is injected into the injection port of the gas chromatograph used for ink detection through the needle 2, so as to detect the ink, and other related components and working principles on the gas chromatograph are all existing technologies, which will not be described in detail here, and the needle tube 1, the needle 2, and the piston rod 3 together constitute the sampling needle body.

[0031] During use, in order to prevent the needle 2 from being exposed to the external environment for a long time before and after sampling, resulting in impurities and dust that affect the purity of the sample being attached to the needle 2, it is preferably provided with a sleeve 4 on the outer periphery of the needle tube 1, and a slide groove 8 is provided on the outer side wall of the sleeve 4 at one end close to the needle 2. A protective tube 5 is slidably installed on the sleeve 4 through the slide groove 8. The protective tube 5 can slide on the sleeve 4 toward the needle 2 through the slide groove 8 and wrap the needle 2 therein. A blocking component is provided on the end of the protective tube 5 away from the sleeve 4, and the opening at the end of the protective tube 5 can be blocked by the blocking component, so that the needle 2 is in a relatively sealed environment, thereby keeping the needle 2 clean and preventing dust in the external environment from adhering to the needle 2. A ring 6 is slidably provided on the end of the protective tube 5 away from the sleeve 4, and the ring 6 is connected to the blocking component by transmission. When the ring 6 moves toward the protective tube 5, the ring 6 drives the blocking component to move toward the ring 6 and open.

[0032] In specific use, when it is necessary to sample the ink sample, since in the initial state, the protective tube 5 is relatively far away from the sleeve 4 and wraps the needle 2 inside, and the ring 6 also protrudes from the end of the protective tube 5, so when in use, the protective tube 5 is placed against the top of the sample storage device, and the storage device is an ink channel commonly used in the prior art to hold ink, and is provided with a hole for filling the ink, and the detailed structure is not described in detail here, so that the ring 6 is in contact with the top of the storage device, that is, the ring 6 covers the hole on the storage device, and then the sleeve 4 is pressed to make the ring 6 move relatively into the protective tube 5, and then the ring 6 drives the sealing plate 7 to move relatively and open, and then the sleeve 4 The protective tube 5 is pressed and slides relative to the sleeve 4, so that the needle 2 extends out of the end of the protective tube 5 and enters the ink sample to extract the sample. When the sample collection work is completed, the pressing work on the sleeve 4 is released, and the sliding protective tube 5 moves and resets. During the movement and reset of the sliding protective tube 5, the ring 6 keeps in contact with the storage device. Then, when the protective tube 5 is reset, the needle 2 shrinks in the protective tube 5, and then the ring 6 is separated from the storage device, and the ring 6 automatically resets, so that the sealing plate 7 moves and resets to seal the end of the protective tube 5, thereby preventing external dust from entering the protective tube 5. Then, the sample can be injected into the gas chromatograph for detection.

[0033] See also Figure 5-Figure 6 , Fig. 9 , Fig.11In order to maintain a relative limiting effect between the protection tube 5 and the sleeve 4, preferably, a groove 14 is provided in the end of the slide groove 8 close to the needle 2, and a slide plate 18 slidably connected to the slide groove 8 is symmetrically provided along the center of the inner wall of the protection tube 5. The protection tube 5 is slidably installed on the sleeve 4 through the slide plate 18, and a second boss 26 slidably adapted to the groove 14 is slidably provided on the end of the slide plate 18 close to the sleeve 4. A spring is provided between the second boss 26 and the side wall of the protection tube 5. When the second boss 26 is adapted to the groove 14, the relative position of the protection tube 5 and the sleeve 4 is restricted, so that the protection tube 5 cannot move on the sleeve 4, thereby realizing protection of the needle 2, and cooperating with the sleeve 4 to realize protection of the sampling needle, avoiding the problem of the sampling needle falling and being damaged during the process of taking or transporting, and at the same time, the protection tube 5 prevents external dust from adhering to the needle 2.

[0034] See also Figure 2 , Figure 8 , Fig.10 The sealing assembly includes a sealing plate 7; a circular hole for the needle to pass through is provided at the center of one end of the protective tube 5 away from the sleeve 4, and the sealing plate 7 is slidably arranged in the side wall of the end of the protective tube 5 away from the sleeve 4, and the sealing plate 7 is symmetrically arranged along the center of the protective tube 5, and a second pull rope 17 is fixedly arranged between the sealing plate 7 and the circular ring 6. When the two groups of sealing plates 7 move and fit together, the circular hole is blocked. Preferably, the size of the circular hole is larger than the size of the needle 2. When the circular ring 6 moves into the protective tube 5, the circular ring 6 pulls the second pull rope 17 to move into the protective tube 5, and then drives the sealing plate 7 away from the circular hole through the second pull rope 17, and the sealing plate 7 and the inner wall of the protective tube 5 are elastically connected by a spring or an elastic column. When the circular ring 6 is not subjected to external force, the two groups move toward the circular hole to cooperate to block the circular hole, and the sealing plate 7 moves and pulls the circular ring 6 to move and reset through the second pull rope 17. The inner wall of the protective tube 5 is provided with a wire groove for the sliding of the second pull rope 17, so that the circular ring 6 will not get stuck when moving upward.

[0035] See also Figure 2 , Figure 3 , Figure 5 , Figure 8-Figure 9 , Fig.11The end of the ring 6 close to the sleeve 4 is fixedly provided with a fixing rod 19 symmetrically along the center, the end of the fixing rod 19 away from the ring 6 is fixedly provided with a wedge block 29, and the end of the second protrusion 26 close to the ring 6 is fixedly provided with a trigger plate 27, the trigger plate 27 and the wedge block 29 are slidably matched, and the slide plate 18 and the side wall of the protection tube 5 are provided with a through groove 20, and the fixing rod 19 is slidably provided in the through groove 20. Preferably, the inclined surface on the wedge block 29 is set in the direction away from the slide plate 18, and the end of the trigger plate 27 close to the wedge block 29 is provided with an inclined surface facing the wedge block 29, so that when the ring 6 moves toward the slide plate 18 in use, the trigger plate 27 is pushed. The movable fixing rod 19 moves toward the trigger plate 27, so that the wedge block 29 cooperates with the trigger plate 27, so that the trigger plate 27 moves in the direction away from the slide plate 18, so that the second protrusion 26 shrinks in the slide plate 18 and separates from the groove 14, so that the protection tube 5 can slide relative to the sleeve 4; when the protection tube 5 slides away from the sleeve 4 and resets, the ring 6 moves and resets under the action of the sealing plate 7, so that the fixing rod 19 moves and resets, so that the wedge block 29 is separated from the trigger plate 27, and then the second protrusion 26 moves under the action of the spring and extends into the groove 14 to limit the relative position between the sleeve 4 and the protection tube 5.

[0036] Furthermore, a limiting groove 10 is provided in the end of the slide 8 away from the needle 2, and a first protrusion 25 is slidably provided at the end of the slide plate 18 close to the limiting groove 10, a spring is provided between the first protrusion 25 and the protective tube 5, and a third pull rope 28 is fixedly provided between the first protrusion 25 and the second protrusion 26, the first protrusion 25 and the limiting groove 10 are slidably matched, and the first protrusion 25 is provided on the side of the second protrusion 26 away from the ring 6, preferably, when the protective tube 5 moves relatively to the end of the slide 8 away from the needle 2, the second protrusion 26 does not move to the position of the limiting groove 10, and the first protrusion 2 5 moves to the corresponding position, and when the second protrusion 26 moves in the direction away from the slide plate 18, the first protrusion 25 moves in the direction of the slide plate 18, and when the second protrusion 26 moves in the direction of the slide plate 18, the first protrusion 25 moves in the direction away from the slide plate 18 through the action of the third pull rope 28. In this way, when in use, after the protection tube 5 slides relatively on the sleeve 4 to the position of the limiting groove 10, the first protrusion 25 moves and extends into the limiting groove 10, limiting the relative position of the sleeve 4 and the protection tube 5, thereby facilitating the replacement or cleaning of the needle 2.

[0037] Furthermore, preferably, a notch is provided on one side of the first protrusion 25 relative to the second protrusion 26, and a limit plate is elastically provided in the side wall of the sleeve 4 through a spring, and the limit plate is provided between the limit groove 10 and the groove 14, and close to the position of the limit groove 10, the end of the limit plate away from the groove 14 slides into the limit groove 10, and the end of the limit plate close to the limit groove 10 is provided with an inclined surface facing the first protrusion 25, and a pressing rod is provided at the end of the sleeve 4 away from the needle 2, and the pressing rod slides into the side wall of the sleeve 4 and is fixedly connected with the limit plate, the limiting plate and the pressing rod are not shown in the figure, and a semicircular structure is provided at the end of the first protrusion 25, and the limiting groove 10 corresponds to the rounded corner of one end of the slide plate 18, so that the first protrusion 25 can only extend into the limit groove 10 through the limiting The cooperation between the positioning plate and the notch can complete the limitation of the first protrusion 25. In this way, when in use, after the first protrusion 25 moves to the position of the limiting groove 10, the first protrusion 25 moves into the limiting groove 10 under the action of the spring, and at this time the limiting plate extends into the limiting groove 10, so the movement of the first protrusion 25 will cooperate with the inclined surface of the limiting plate. After squeezing the limiting plate to move in the direction of the groove 14, when it corresponds to the notch, it moves and extends into the notch to limit the relative position of the first protrusion 25 and the limiting groove 10. When it is necessary to release the limitation of the sleeve 4 and the protective tube 5, the pressing rod is pushed in the direction of the needle 2, so that the limiting plate moves in the direction of the needle 2 and separates from the notch, so that the first protrusion 25 moves and separates from the limiting plate, and then the protective tube 5 is slid in the direction of the needle 2.

[0038] See also Figure 8 , Fig.10 Preferably, a fixed disk 21 is fixedly provided in the protective tube 5, and the fixed disk 21 is a hollow structure, and a structure of the same size as the circular hole is provided in the center of the fixed disk 21. The fixed disk 21 is fixedly provided in one end of the protective tube 5 away from the needle tube 1, and a mounting block 23 is slidably provided in the fixed disk 21, and the mounting block 23 is symmetrically arranged along the center of the fixed disk 21. The two groups of mounting blocks 23 correspond to the two groups of sealing plates 7 respectively, and absorbent cotton 24 is fixedly provided on the side of the mounting block 23 close to the circular hole. When the two groups of mounting blocks 23 are close to each other, the two groups of absorbent cotton 24 are pushed to fit together, and when the two groups of absorbent cotton 24 fit together, the opposite end of the absorbent cotton 24 fits with the outer wall of the needle 2, and a telescopic tube 22 is fixedly provided on the side of the mounting block 23 away from the absorbent cotton 24. When the telescopic tube 22 is inflated, the mounting block 23 is pushed to move in the direction of the circular hole, and when the telescopic tube 22 contracts, the mounting block 23 is driven to move and reset.

[0039] Furthermore, preferably, baffles 11 are provided on both sides of one end of the sealing plate 7 close to the circular ring 6. When the sealing plate 7 moves toward the circular ring 6, the baffle 11 will be pushed to move toward the circular ring 6. An airbag 30 is fixedly provided at one end of the baffle 11 away from the sealing plate 7. The airbag 30 is an elastic telescopic tube structure. When the baffle 11 moves toward the circular ring 6, the airbag 30 is compressed. A connecting tube 31 is provided at one end of the airbag 30 away from the baffle 11. The end of the connecting tube 31 away from the airbag 30 is connected to the telescopic tube 22. When the airbag 30 is compressed, the gas inside the airbag is transported to the telescopic tube 22 through the connecting tube 31, so that the telescopic tube 22 expands. The baffle 11, the airbag 30 and the connecting tube 31 are all provided in the side wall of the protective tube 5. When in use, when sampling the ink sample, the sleeve 4 is pressed to make the circular ring 6 move toward the protective tube 5. The movement of the protective tube 5 and the movement of the protective tube 5 toward the sleeve 4, the movement of the circular ring 6 allows the two sets of sealing plates 7 to move away from each other through the second pull rope 17. The movement of the sealing plate 7 will expand the telescopic tube 22 through the cooperation of the baffle 11, the airbag 30, and the connecting tube 31, thereby making the absorbent cotton 24 fit with the needle 2, and then when the needle 2 moves to insert the sample for sampling, the absorbent cotton 24 cleans the outside of the needle 2. After the sampling is completed, the sliding protective tube 5 moves away from the sleeve 4 and resets, thereby making the needle 2 move and shrink in the protective tube 5. At this time, the absorbent cotton 24 will also wipe the outer wall of the needle 2, clean the sample that may be attached to it, and keep the needle 2 clean. Then, when the circular ring 6 moves and resets, the sealing plate 7 moves and resets, thereby making the baffle 11, the airbag 30, the telescopic tube 22, the mounting block 23, etc. move and reset.

[0040] See also Figure 3-Figure 7 A limiting post 9 is rotatably provided at one end of the sleeve 4 away from the needle 2, and a matching plate 16 is elastically slidably provided in one end of the limiting post 9 close to the needle tube 1 through a spring. Preferably, an annular groove 12 is arrayed on the piston rod 3, and the annular groove 12 is slidably adapted to the matching plate 16.

[0041] Furthermore, a movable block 13 is elastically arranged in the groove 14 by a spring, and a first pull rope 15 is fixedly arranged at one end of the movable block 13 close to the groove 14 . The first pull rope 15 slides through the side walls of the sleeve 4 and the limiting column 9 and is fixedly connected to the matching plate 16 .

[0042] During specific use, when the protective tube 5 is at the end of the sleeve 4 away from the piston rod 3, the second protrusion 26 cooperates with the groove 14, and the movable block 13 is located in the groove 14 near the bottom position of the groove 14 under the action of the second protrusion 26. The end of the protruding limit column 9 of the matching plate 16 extends into the annular groove 12 under the action of the spring, and the relative position of the piston rod 3 and the needle tube 1 is limited, thereby preventing the piston rod 3 from sliding when there is no need to extract samples, and preventing the piston rod 3 from sliding and sucking external air into the needle tube 1, causing dust in the external air to enter the needle tube 1 and cause pollution. At this time, the limit column 9 fits relative to the end of the needle tube 1 away from the needle head 2, thereby providing a limit for the sleeve 4 to be set on the needle tube 1; when it is necessary to collect samples, the ring 6 moves relative to the protective tube 5, and the second protrusion 26 is contracted in the slide plate 18 through the cooperation of the fixing rod 19 and the wedge block 29, thereby making the groove 14 moves upward under the action of the spring, and the groove 14 moves upward to pull the matching plate 16 to move into the limiting column 9 through the first pull rope 15. At this time, the piston rod 3 can slide relative to the needle tube 1 to extract samples. When the sample collection is completed, the protection tube 5 and the ring 6 move and reset respectively. The ring 6 moves and resets to make the second protrusion 26 move and reset and extend into the groove 14, thereby making the movable block 13 move and reset, and then making the matching plate 16 move and reset and be taken into the corresponding annular groove 12 after the piston rod 3 moves, so that the piston rod 3 cannot move, avoiding the sampling needle from falling off during the process from the sampling needle collecting the sample to the injection in the detection device, causing the piston rod 3 to move relatively and causing the sample in the needle tube 1 to be ejected from the needle head 2; and when it is necessary to remove the sleeve 4 from the needle tube 1, the rotating limiting column 9 is separated from the end of the needle tube 1 and then the sleeve 4 is slid and removed from the needle tube 1.

Claims

1. An ink detection device, comprising a needle tube, a piston rod is slidably arranged in the needle tube, and a needle is installed at one end of the needle tube; characterized in that: The outer sleeve of the needle tube is provided with a sleeve, and the outer side wall of the end of the sleeve close to the needle is provided with a sliding groove, and the sleeve is slidably installed with a protective tube through the sliding groove, and the end of the protective tube away from the sleeve is provided with a blocking component, and the end of the protective tube away from the sleeve is slidably provided with a ring, and the ring and the blocking component are transmission-connected, and when the ring moves toward the protective tube, the ring drives the blocking component to move toward the ring and open; a groove is provided in the end of the sliding groove close to the needle, and a slide plate slidably connected to the sliding groove is symmetrically provided on the inner wall of the protective tube, and a second convex column slidably adapted to the groove is slidably provided on the end of the slide plate close to the sleeve; the blocking component includes a sealing Plate; a circular hole for the needle to pass through is set at the center of the end of the protective tube away from the sleeve, the sealing plate is slidably arranged in the side wall of the end of the protective tube away from the sleeve, and the sealing plate is symmetrically arranged along the center of the protective tube, and a second pull rope is fixedly arranged between the sealing plate and the circular ring, and the circular hole is blocked when the two groups of sealing plates move and fit together; a fixing rod is symmetrically fixed along the center of the end of the circular ring close to the sleeve, a wedge block is fixedly arranged at the end of the fixing rod away from the circular ring, and a trigger plate is fixedly arranged at the end of the second protrusion close to the circular ring, the trigger plate and the wedge block are slidably matched, a through groove is arranged in the side wall of the slide plate and the protective tube, and the fixing rod is slidably arranged in the through groove.

2. The ink detection device according to claim 1, characterized in that: A limiting groove is arranged in the end of the slide groove away from the needle, and a first boss is slidably arranged on the end of the slide plate close to the limiting groove, a third pull rope is fixedly arranged between the first boss and the second boss, the first boss and the limiting groove are slidably matched, and the first boss is arranged on the side of the second boss away from the ring.

3. The ink detection device according to claim 1, characterized in that: A fixing plate is fixedly arranged in the protective tube, and the fixing plate is arranged in one end of the protective tube away from the needle tube. A mounting block is slidably arranged in the fixing plate, and the mounting block is symmetrically arranged along the center of the fixing plate. Absorbent cotton is fixedly arranged on the side of the fixing block close to the circular hole, and a telescopic tube is fixedly arranged on the side of the fixing block away from the absorbent cotton.

4. The ink detection device according to claim 3, characterized in that: Baffles are arranged on both sides of one end of the sealing plate close to the circular ring, an airbag is fixedly arranged on one end of the baffle away from the sealing plate, a connecting tube is arranged on one end of the airbag away from the baffle, and the end of the connecting tube away from the airbag is connected to the telescopic tube, and the baffle, the airbag and the connecting tube are all arranged in the side wall of the protective tube.

5. The ink detection device according to claim 2, characterized in that: A limiting post is rotatably arranged at one end of the sleeve away from the needle, and a matching plate is slidably arranged inside one end of the limiting post close to the needle tube.

6. The ink detection device according to claim 5, characterized in that: The piston rod is provided with an annular groove in array, and the annular groove is slidably matched with the matching plate.

7. The ink detection device according to claim 5, characterized in that: A movable block is elastically arranged in the groove, and a first pull rope is fixedly arranged at one end of the movable block close to the groove. The first pull rope slides through the sleeve and the side wall of the limiting column and is fixedly connected to the matching plate.

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