A device for preventing bending of injection needle of automatic sample injector

Abstract

The present invention relates to the technical field of automatic sample injectors, and discloses an anti-bending device for an injection needle of an automatic sample injector, comprising a needle arm main support and an injection needle, a photoelectric sensor is arranged on the left side of the upper surface of the needle arm main support, a needle holder is fixedly connected to the upper surface of the needle arm main support, a needle sleeve is arranged between the needle holder and the needle arm main support via an elastic component, the injection needle is mounted on the needle sleeve, the top end of the needle sleeve passes through the needle holder and a sensor baffle is pressed between the injection needle, a movable plate is arranged below the needle arm main support, and a correction component is arranged on the lower surface of the movable plate; the present invention uses a clever structural design, a first spring, a sensor baffle and a photoelectric sensor, combined with a control program, to effectively prevent the injection needle from being bent by a hard object during the needle insertion process, thereby protecting the injection needle, while protecting the components pierced by the injection needle, and improving the safety of system operation.

Description

Technical Field

[0001] The invention relates to the technical field of automatic sample injectors, in particular to a device for preventing a sample needle of an automatic sample injector from being bent. Background Art

[0002] The injection needle of the automatic sampler is one of the parts that is very prone to failure during the operation of the automatic sampler. Generally, the injection needle of the automatic sampler is not equipped with a protective device. Due to the unreliability of mechanical movement or human error (such as the sample plate is not straight, the sample bottle is placed crookedly, etc.), the injection needle is easy to pierce hard objects during the injection process, causing the injection needle to bend, and may also damage other parts, and even cause personal safety. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides an anti-bending device for an injection needle of an automatic sampler to solve the problem mentioned in the above background technology that the injection needle of the existing automatic sampler has no protective device and is easily pierced into hard objects during the needle insertion process, causing the injection needle to bend, and may also damage other components and even endanger personal safety.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-bending device for an automatic sampler injection needle, comprising a needle arm main support and an injection needle, a photoelectric sensor is arranged on the left side of the upper surface of the needle arm main support, a needle holder is fixedly connected to the upper surface of the needle arm main support, a needle sleeve is arranged between the needle holder and the needle arm main support via an elastic component, the injection needle is mounted on the needle sleeve, the top end of the needle sleeve passes through the needle holder and a sensor baffle is pressed between the injection needle, a movable plate is arranged below the needle arm main support, a correction component is arranged on the lower surface of the movable plate, reset components are arranged on the front and rear sides of the upper surface of the movable plate, and limiting components are arranged on the front and rear sides of the needle holder.

[0007] Preferably, a support column is fixedly connected to the left side of the upper surface of the needle arm main bracket, and the photoelectric sensor is installed on the right side of the top end of the support column, and the photoelectric sensor is located below the sensor baffle.

[0008] Preferably, the injection needle includes a connector, a needle and a threaded column, the top end of the needle is fixedly connected to the connector, the bottom end of the needle passes through the needle arm main bracket and the movable plate in sequence, the threaded column is fixedly connected to the outer surface of the needle, and the bottom end of the threaded column passes through the sensor baffle and is threadedly connected to the needle sleeve.

[0009] Preferably, the needle holder is in a U-shaped structure, and the needle sleeve is slidably connected to the needle holder.

[0010] Preferably, a retaining ring is fixedly connected to the outer surface of the bottom end of the needle sleeve, and a first spring is sleeved on the outer surface of the needle sleeve, one end of the first spring is fixedly connected to the retaining ring, and the other end of the first spring is fixedly connected to the needle holder.

[0011] Preferably, the correction assembly includes a fixed cylinder, two left and right correction wheels and two front and rear correction wheels, the top of the fixed cylinder is fixedly connected to the movable plate, the two left and right correction wheels are arranged on the left and right sides inside the fixed cylinder, the front and rear sides of the left and right correction wheels are rotatably connected to the first rotating shaft through bearings, the first rotating shaft is fixedly connected to the fixed cylinder through a nut, the two front and rear correction wheels are arranged on the front and rear sides inside the fixed cylinder, the left and right sides of the front and rear correction wheels are rotatably connected to the second rotating shaft through bearings, and the second rotating shaft is fixedly connected to the fixed cylinder through a nut.

[0012] Preferably, the reset assembly includes a guide rod, a limit block and a second spring, the top end of the guide rod is fixedly connected to the limit block, the bottom end of the guide rod passes through the needle arm main bracket and is fixedly connected to the movable plate, the second spring is sleeved on the outer surface of the guide rod, one end of the second spring is fixedly connected to the limit block, and the other end of the second spring is fixedly connected to the needle arm main bracket.

[0013] Preferably, the limit assembly includes a box body and a movable rod, the box body is fixedly connected to the needle holder, the movable rod is movably connected to the inside of the box body, the left side of the movable rod is fixedly connected to a connecting rod, the left end of the connecting rod passes through the box body and is fixedly connected to a clamping block, the connecting rod is slidably connected to the box body, the right side of the limit block is fixedly connected to a triangular block corresponding to the clamping block, one end of the movable rod passes through the box body and is fixedly connected to a first arc block, the upper surface of the sensor baffle is fixedly connected to a second arc block corresponding to the first arc block, and a long hole corresponding to the movable rod is opened on the box body.

[0014] Preferably, two cross bars are fixedly connected to the left inner wall of the box, the right end of the cross bar passes through the movable rod and is fixedly connected to the right inner wall of the box, the cross bar is slidably connected to the movable rod, and a third spring is sleeved on the outer surface of the cross bar, one end of the third spring is fixedly connected to the inner wall of the box, and the other end of the third spring is fixedly connected to the movable rod.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the present invention provides an automatic sampler injection needle anti-bending device, which has the following beneficial effects:

[0017] 1. The automatic sampler needle anti-bending device, through ingenious structural design, uses a first spring, a sensor baffle and a photoelectric sensor, combined with a control program, to effectively prevent the sample needle from being bent by a hard object during the needle insertion process, thereby protecting the sample needle and the parts pierced by the sample needle, thereby improving the safety of system operation.

[0018] 2. The automatic sampler needle anti-bending device has a limit assembly that will actuate when the sample needle encounters a hard object. At this time, the reset assembly drives the movable plate and the fixed cylinder to move downward. During the movement of the fixed cylinder, the left and right correction wheels and the front and rear correction wheels can roll along the sample needle. The left and right correction wheels and the front and rear correction wheels are squeezed in different directions, so that the sample needle can be effectively corrected for subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0021] Figure 3 It is a partial cross-sectional structural schematic diagram of the present invention;

[0022] Figure 4 For the present invention Figure 3 The enlarged schematic diagram of point A in the middle;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the injection needle of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the correction component of the present invention;

[0025] Figure 7 It is a schematic diagram of the installation structure of the needle sleeve of the present invention.

[0026] In the figure: 1, needle arm main support; 2, injection needle; 3, photoelectric sensor; 4, needle holder; 5, elastic component; 6, needle sleeve; 7, sensor baffle; 8, movable plate; 9, correction component; 10, reset component; 11, limit component; 101, support column; 201, connector; 202, needle; 203, threaded column; 601, baffle ring; 602, first spring; 901, fixed cylinder; 902, left and right correction wheels; 9 03, front and rear correction wheels; 904, first rotating shaft; 905, second rotating shaft; 1001, guide rod; 1002, limit block; 1003, second spring; 1101, box body; 1102, movable rod; 1103, connecting rod; 1104, clamping block; 1105, triangular block; 1106, first arc block; 1107, second arc block; 1108, long hole; 1109, cross bar; 1010, third spring. DETAILED DESCRIPTION

[0027] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of an automatic sampler injection needle anti-bending device and method of the present invention in conjunction with the accompanying drawings.

[0028] See also Figure 1-7 The present invention provides an anti-bending device for an injection needle of an automatic sampler, comprising a needle arm main support 1 and an injection needle 2, a photoelectric sensor 3 is arranged on the left side of the upper surface of the needle arm main support 1, a needle frame 4 is fixedly connected to the upper surface of the needle arm main support 1, a needle sleeve 6 is arranged between the needle frame 4 and the needle arm main support 1 through an elastic component 5, the injection needle 2 is installed on the needle sleeve 6, the top end of the needle sleeve 6 passes through the needle frame 4 and a sensor baffle 7 is pressed between the injection needle 2, a movable plate 8 is arranged below the needle arm main support 1, a correction component 9 is arranged on the lower surface of the movable plate 8, a reset component 10 is arranged on both the front and rear sides of the upper surface of the movable plate 8, and a limit component 11 is arranged on both the front and rear sides of the needle frame 4;

[0029] Specifically, a support column 101 is fixedly connected to the left side of the upper surface of the needle arm main bracket 1, and a photoelectric sensor 3 is installed on the right side of the top of the support column 101. The photoelectric sensor 3 is located below the sensor baffle 7. In this way, after the sensor baffle 7 leaves the photoelectric sensor 3, the program detects that the signal of the photoelectric sensor 3 changes, and then stops the needle insertion;

[0030] The injection needle 2 includes a connector 201, a needle 202 and a threaded column 203. The top of the needle 202 is fixedly connected to the connector 201. The bottom of the needle 202 passes through the needle arm main bracket 1 and the movable plate 8 in sequence. The threaded column 203 is fixedly connected to the outer surface of the needle 202. The bottom of the threaded column 203 passes through the sensor baffle 7 and is threadedly connected to the needle sleeve 6. In this way, the injection needle 2 drives the needle sleeve 6 and the baffle ring 601 to move upward and compress the first spring 602. At the same time, the sensor baffle 7 is lifted up together, and the threaded column 203 is convenient for connection with the needle sleeve 6.

[0031] The outer surface of the bottom end of the needle sleeve 6 is fixedly connected with a retaining ring 601, and the outer surface of the needle sleeve 6 is sleeved with a first spring 602, one end of the first spring 602 is fixedly connected with the retaining ring 601, and the other end of the first spring 602 is fixedly connected with the needle holder 4. In this way, the force of the first spring 602 is large enough when the needle is inserted normally, and the injection needle 2 can easily penetrate into the bottle. When the needle is inserted into a hard object, the first spring 602 shrinks;

[0032] Furthermore, the correction component 9 includes a fixed cylinder 901, two left and right correction wheels 902 and two front and rear correction wheels 903. The top of the fixed cylinder 901 is fixedly connected to the movable plate 8. The two left and right correction wheels 902 are arranged on the left and right sides of the fixed cylinder 901. The front and rear sides of the left and right correction wheels 902 are rotatably connected to the first rotating shaft 904 through bearings. The first rotating shaft 904 is fixedly connected to the fixed cylinder 901 through a nut. The two front and rear correction wheels 903 are arranged on the front and rear sides of the fixed cylinder 901. The left and right sides of the front and rear correction wheels 903 are rotatably connected to the second rotating shaft 905 through bearings. The second rotating shaft 905 is fixedly connected to the fixed cylinder 901 through a nut. The fixed cylinder 901 is arranged in this way. During the movement, the left and right correction wheels 902 and the front and rear correction wheels 903 can roll along the injection needle 2, and the injection needle 2 can be effectively corrected by squeezing the left and right correction wheels 902 and the front and rear correction wheels 903 in different directions.

[0033] Furthermore, the reset assembly 10 includes a guide rod 1001, a limit block 1002 and a second spring 1003. The top end of the guide rod 1001 is fixedly connected to the limit block 1002, the bottom end of the guide rod 1001 passes through the needle arm main bracket 1 and is fixedly connected to the movable plate 8, the second spring 1003 is sleeved on the outer surface of the guide rod 1001, one end of the second spring 1003 is fixedly connected to the limit block 1002, and the other end of the second spring 1003 is fixedly connected to the needle arm main bracket 1. In this way, after the limit assembly 11 is contracted, the return of the second spring 1003 drives the limit block 1002 and the guide rod 1001 to move downward, and the guide rod 1001 can drive the movable plate 8 and the fixed cylinder 901 to move downward during the movement;

[0034] Furthermore, the limiting assembly 11 includes a box body 1101 and a movable rod 1102, the box body 1101 is fixedly connected to the needle holder 4, the movable rod 1102 is movably connected to the inside of the box body 1101, the left side of the movable rod 1102 is fixedly connected to a connecting rod 1103, the left end of the connecting rod 1103 passes through the box body 1101 and is fixedly connected to a clamping block 1104, the connecting rod 1103 is slidably connected to the box body 1101, the right side of the limiting block 1002 is fixedly connected to a triangular block 1105 corresponding to the clamping block 1104, one end of the movable rod 1102 passes through the box body 1101 and is fixedly connected to a first arc block 1106, the upper surface of the sensor baffle 7 is fixedly connected to a second arc block 1107 corresponding to the first arc block 1106, a long hole 1108 corresponding to the movable rod 1102 is opened on the box body 1101, and the box body 110 1, two cross bars 1109 are fixedly connected to the left inner wall of the box 1101, the right end of the cross bar 1109 passes through the movable rod 1102 and is fixedly connected to the right inner wall of the box body 1101, the cross bar 1109 is slidably connected to the movable rod 1102, and the outer surface of the cross bar 1109 is sleeved with a third spring 1010, one end of the third spring 1010 is fixedly connected to the inner wall of the box body 1101, and the other end of the third spring 1010 is fixedly connected to the movable rod 1102, so that the sensor baffle 7 is arranged to drive the second arc block 1107 to move upward and squeeze the first arc block 1106, at this time, the first arc block 1106 drives the movable rod 1102 to slide to the right along the cross bar 1109 and stretch the third spring 1010, and the movable rod 1102 can drive the connecting rod 1103 and the block 1104 to move during the movement, thereby releasing the limit on the correction component 9;

[0035] See also Figure 1 and Figure 2 As shown, in order to facilitate the installation and fixation of the injection needle 2, the needle holder 4 is in a U-shaped structure, and the needle sleeve 6 is slidably connected to the needle holder 4. In this way, the needle sleeve 6 can slide up and down along the needle holder 4 to prevent the injection needle 2 from being bent.

[0036] The working principle of the present invention is as follows: during the normal injection process, the needle arm main support 1 moves downward to drive the injection needle 2 to move down. After encountering the rubber cover of the injection bottle, although there is a certain resistance, the force of the first spring 602 is large enough, and the injection needle 2 can be easily inserted into the bottle, and the injection needle 2 will not be lifted up. When the injection needle 2 encounters a hard object during the injection process, since the injection needle 2 is threadedly connected to the needle sleeve 6 through the threaded column 203, the injection needle 2 drives the needle sleeve 6 and the retaining ring 601 to move upward and compress the first spring 602, and at the same time, the sensor The baffle 7 is lifted up together. When the sensor baffle 7 leaves the photoelectric sensor 3, the program detects that the signal of the photoelectric sensor 3 changes, and then stops the needle insertion, allowing the injection needle 2 to move in the opposite direction, return to the origin and alarm "needle insertion obstacle", thereby preventing the injection needle 2 from being bent during the needle insertion process, and will not damage other components, thereby improving the personal safety of the user. At the same time, the sensor baffle 7 drives the second arc block 1107 to move upward and squeeze the first arc block 1106. At this time, the first arc block 1106 drives the movable rod 1102 to slide to the right along the cross bar 1109. The third spring 1010 is moved and stretched. The movable rod 1102 can drive the connecting rod 1103 and the block 1104 to move during the movement. When the block 1104 is separated from the triangular block 1105, the second spring 1003 returns to the original position and drives the limit block 1002 and the guide rod 1001 to move downward. The guide rod 1001 can drive the movable plate 8 and the fixed cylinder 901 to move downward during the movement. The fixed cylinder 901 can make the left and right correction wheels 902 and the front and rear correction wheels 903 roll along the injection needle 2 through the left and right correction wheels 902 and the front and rear correction wheels 903. The correction wheel 902 and the front and rear correction wheels 903 squeeze in different directions, so that the injection needle 2 can be effectively corrected for subsequent use. After the needle insertion obstacles are removed, the injection needle 2 is inserted, and the fixed cylinder 901 first contacts the injection bottle. At this time, the guide rod 1001 and the limit block 1002 move upward and compress the second spring 1003. The limit block 1002 can squeeze the triangular block 1105 during the movement until the limit block 1002 moves to the upper side of the block 1104 for limiting, so that the correction component 9 performs the next correction on the injection needle 2.

[0037] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An anti-bending device for an automatic sampler injection needle, comprising a needle arm main support (1) and an injection needle (2), characterized in that: A photoelectric sensor (3) is arranged on the left side of the upper surface of the needle arm main support (1); a needle frame (4) is fixedly connected to the upper surface of the needle arm main support (1); a needle sleeve (6) is arranged between the needle frame (4) and the needle arm main support (1); an elastic component (5) is arranged between the needle sleeve (6) and the needle frame (4); the injection needle (2) is mounted on the needle sleeve (6); the top end of the needle sleeve (6) passes through the needle frame (4) and a sensor baffle (7) is pressed between the injection needle (2); a movable plate (8) is arranged below the needle arm main support (1); a correction component (9) is arranged on the lower surface of the movable plate (8); reset components (10) are arranged on both the front and rear sides of the upper surface of the movable plate (8); and limit components (11) are arranged on both the front and rear sides of the needle frame (4); The correction component (9) comprises a fixed cylinder (901), two left and right correction wheels (902) and two front and rear correction wheels (903); the top end of the fixed cylinder (901) is fixedly connected to the movable plate (8); the two left and right correction wheels (902) are arranged on the left and right sides of the fixed cylinder (901); the front and rear sides of the left and right correction wheels (902) are rotatably connected to a first rotating shaft (904) via bearings; the first rotating shaft (904) is fixedly connected to the fixed cylinder (901) via a nut; the two front and rear correction wheels (903) are arranged on the front and rear sides of the fixed cylinder (901); the left and right sides of the front and rear correction wheels (903) are rotatably connected to a second rotating shaft (905) via bearings; the second rotating shaft (905) is fixedly connected to the fixed cylinder (901) via a nut; The reset assembly (10) comprises a guide rod (1001), a limit block (1002) and a second spring (1003); the top end of the guide rod (1001) is fixedly connected to the limit block (1002); the bottom end of the guide rod (1001) passes through the needle arm main support (1) and is fixedly connected to the movable plate (8); the second spring (1003) is sleeved on the outer surface of the guide rod (1001); one end of the second spring (1003) is fixedly connected to the limit block (1002); and the other end of the second spring (1003) is fixedly connected to the needle arm main support (1); The limiting assembly (11) comprises a box body (1101) and a movable rod (1102); the box body (1101) is fixedly connected to the needle holder (4); the movable rod (1102) is movably connected to the inside of the box body (1101); a connecting rod (1103) is fixedly connected to the left side of the movable rod (1102); the left end of the connecting rod (1103) passes through the box body (1101) and is fixedly connected to a clamping block (1104); the connecting rod (1103) is slidably connected to the box body (1101) The right side of the limit block (1002) is fixedly connected with a triangular block (1105) corresponding to the clamping block (1104); one end of the movable rod (1102) passes through the box body (1101) and is fixedly connected with a first arc block (1106); the upper surface of the sensor baffle (7) is fixedly connected with a second arc block (1107) corresponding to the first arc block (1106); and the box body (1101) is provided with a long hole (1108) corresponding to the movable rod (1102).

2. The device for preventing bending of an injection needle of an automatic sampler according to claim 1, characterized in that: A support column (101) is fixedly connected to the left side of the upper surface of the needle arm main support (1), and the photoelectric sensor (3) is installed on the right side of the top end of the support column (101). The photoelectric sensor (3) is located below the sensor baffle (7).

3. The device for preventing bending of an injection needle of an automatic sampler according to claim 2, characterized in that: The injection needle (2) comprises a connector (201), a needle (202) and a threaded column (203); the top end of the needle (202) is fixedly connected to the connector (201); the bottom end of the needle (202) passes through the needle arm main support (1) and the movable plate (8) in sequence; the threaded column (203) is fixedly connected to the outer surface of the needle (202); the bottom end of the threaded column (203) passes through the sensor baffle (7) and is threadedly connected to the needle sleeve (6).

4. The device for preventing bending of an injection needle of an automatic sampler according to claim 3, characterized in that: The needle frame (4) is of a U-shaped structure, and the needle sleeve (6) is slidably connected to the needle frame (4).

5. The device for preventing bending of an injection needle of an automatic sampler according to claim 4, characterized in that: The elastic component (5) comprises a retaining ring (601) and a first spring (602); the retaining ring (601) is fixedly connected to the outer surface of the bottom end of the needle sleeve (6); the first spring (602) is sleeved on the outer surface of the needle sleeve (6); one end of the first spring (602) is fixedly connected to the retaining ring (601); and the other end of the first spring (602) is fixedly connected to the needle holder (4).

6. The device for preventing bending of an injection needle of an automatic sampler according to claim 5, characterized in that: Two cross bars (1109) are fixedly connected to the left inner wall of the box body (1101); the right end of the cross bar (1109) passes through the movable rod (1102) and is fixedly connected to the right inner wall of the box body (1101); the cross bar (1109) is slidably connected to the movable rod (1102); a third spring (1010) is sleeved on the outer surface of the cross bar (1109); one end of the third spring (1010) is fixedly connected to the inner wall of the box body (1101); and the other end of the third spring (1010) is fixedly connected to the movable rod (1102).

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