Novel injection needle circulation cross weighing device
By designing an automated injection needle circulation cross-weighting device, the problems of cumbersome and errors in the prior art injection needle weighing process are solved, and higher weighing accuracy and working efficiency are achieved.
Patent Information
- Application Number
- CN202421965808.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-08-14
AI Technical Summary
In the prior art, the weighing process of the injection needle is cumbersome, which can easily lead to contamination and operational errors, affecting the accuracy and efficiency of weighing.
A new type of injection needle circulation cross weighing device is designed, including a weighing mechanism and a control system to realize automatic cross weighing. The device automatically alternates the weighing of the reference injection needle and the sample injection needle through components such as cylinders, motors and circular rails to reduce artificial operation.
It improves the weighing accuracy and working efficiency of the injection needle, reduces the error caused by human operation, and shortens the period of standard gas preparation.
Smart Images
Figure CN222926275U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of weighing, in particular to a novel injection needle circulating cross weighing device. Background Art
[0002] Standard gas is a mixed gas with a specific quantity value. When formulating it, media with different components need to be filled into a steel cylinder in sequence according to the calculated mass, and finally carrier gas is filled and fully mixed to obtain the target standard gas. If the media components to be formulated are liquids under normal temperature and pressure, such as ethanol in air, acetone in air, etc., we generally use an injection needle with a lock to take a certain mass of liquid, then inject it into the gas path, and then it is purged into the steel cylinder by the carrier gas. Then, by weighing the mass of the injection needle before and after injecting the liquid, the mass of the liquid injected into the steel cylinder can be obtained.
[0003] However, since different liquids have corresponding saturated vapor pressures, when too much liquid is injected into the steel cylinder, it may not be vaporized. Therefore, generally, the mass of the liquid to be injected by the injection needle is relatively small, and the difference between the two masses is too large for the injection needle. Therefore, injection needles with the same shape and similar mass need to be selected as reference injection needles to offset the influence of air buoyancy on the injection needle. Then, through the cross weighing mode, the mass difference between the reference injection needle and the sample injection needle is obtained. The difference between the two mass differences of the injection needle before and after injecting the liquid is the mass of the liquid injected into the steel cylinder by the injection needle.
[0004] Currently, most weighing procedures adopt traditional manual weighing. First, open the wind shield, place the reference injection needle on the balance, then close the wind shield and wait for it to stabilize before taking the reading, and its indication is X 1 , then open the wind shield, remove the reference injection needle, replace it with the sample injection needle on the balance, close the wind shield, wait for it to stabilize before taking the reading, and its indication is Y 1 , repeat the above operation, and the average value of n consecutive times is the mass of the sample injection needle minus the reference injection needle, that is During the alternating weighing process, the injection needles to be alternated need to be placed on the table for weighing. During this process, the injection needles are easily attached and contaminated, and the cumbersome operation will also cause bumps on the needle tip or other parts of the injection needle, thus affecting the weighing result. At the same time, the manual operation process will also greatly affect the air flow, which will greatly extend the time for the balance to stabilize, so the weighing efficiency is extremely low, and the preparation cycle of the standard gas is greatly affected. Content of the Utility Model
[0005] The technical problem to be solved by the utility model is to provide a novel injection needle circulating cross weighing device to realize automatic cross weighing and improve the weighing accuracy at the same time.
[0006] The present utility model is realized as follows: a new type of injection needle circulating cross weighing device, comprising a weighing mechanism and a control system;
[0007] The weighing mechanism includes a base, a cylinder, a motor, a circular rail and a balance. The balance is located at the front end of the base. There is a concave supporting bar on the balance. The cylinder is erected on the base. The motor is installed on the cylinder. The circular rail is connected to the motor. A plurality of support rods and a plurality of threaded holes are arranged at intervals on the circular rail. The support rods and the threaded holes are arranged in one-to-one correspondence. Two support rings are sleeved on each support rod, and a hanging ring is suspended on each support ring. A threaded filling block matching the threaded hole is arranged in the threaded hole. The threaded filling block and the circular rail are made of the same magnetic material. A magnetic inductor and a proximity sensor are arranged at the front end of the cylinder;
[0008] The magnetic inductor, the proximity sensor, the balance, the cylinder and the motor are respectively electrically connected to the control system.
[0009] Further, there is a fixing block on the balance, and the concave supporting bar is arranged on the fixing block.
[0010] Further, the motor is installed on the cylinder through a telescopic column, and its up and down movement is controlled by the cylinder.
[0011] Further, the circular rail is connected to the motor through a coupling, and its rotational movement is controlled by the motor.
[0012] Further, there is a vertical bar at the front end of the cylinder. The magnetic inductor is arranged at the top of the vertical bar. There is a horizontal bar in the middle of the vertical bar, and the proximity sensor is arranged on the horizontal bar.
[0013] Further, the number of the support rods is set to 4 or 6 or 8.
[0014] Further, when the threaded filling block is completely screwed into the threaded hole, the back surface of the circular rail is flat.
[0015] Further, the distance between the two hanging rings on the support rod is greater than the cross-sectional diameter of the concave supporting bar.
[0016] Further, the control system includes a control panel.
[0017] Further, the balance is electrically connected to the control system.
[0018] The present utility model has the following advantages: the device of the present utility model can be placed in a windproof cover to weigh the injection needle, which can avoid the influence of air flow on the balance indication caused by the frequent opening and closing of the windproof cover, and can automatically perform the circulating and alternating weighing of the reference injection needle and the sample injection needle, and can obtain multiple groups of weighing results, improve the weighing accuracy and improve the overall working efficiency. Description of the Drawings
[0019] The present utility model will be further described below with reference to the accompanying drawings in conjunction with embodiments.
[0020] Figure 1 It is a schematic three-dimensional structure diagram of a novel injection needle circulating cross weighing device of the present utility model;
[0021] Figure 2 It is the front view of the device in a specific embodiment of the present utility model;
[0022] Figure 3 It is the side view of the device in a specific embodiment of the present utility model.
[0023] Explanation of the reference numerals in the drawings:
[0024] 10. Weighing mechanism, 11. Base, 111. Upright bar, 112. Cross bar, 12. Cylinder, 121. Telescopic column, 13. Motor, 131. Coupling, 14. Circular rail, 141. Support rod, 142. Threaded hole, 143. Support ring, 144. Hanging ring, 145. Thread filling block, 15. Balance, 151. Concave supporting bar, 152. Fixed block, 16. Magnetic inductor, 17. Proximity sensor, 20. Control system, 21. Control panel, 30. Injection needle. Specific embodiments
[0025] Embodiments of the present application provide a novel injection needle circulating cross weighing device for automatically cross weighing a reference injection needle and sample injection needles in a wind shield, improving the weighing work efficiency and at the same time improving the weighing accuracy.
[0026] The technical solution in the embodiments of the present application has the following general idea: by setting an automatic cross weighing mechanism to alternately weigh the reference injection needle and several sample injection needles, and this process is always carried out in the wind shield, without manual repeated alternate operation, reducing the weighing error caused by manual operation and improving the work efficiency at the same time.
[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the drawings of the specification and specific embodiments.
[0028] As Figures 1 to 3 shown, a novel injection needle circulating cross weighing device of the present utility model includes a weighing mechanism 10 and a control system 20;
[0029] The weighing mechanism 10 includes a base 11, a cylinder 12, a motor 13, a circular rail 14, and a balance 15. The balance 15 is located at the front end of the base 11. A concave supporting bar 151 is provided on the balance 15. The cylinder 12 is erected on the base 11. The motor 13 is installed on the cylinder 12. The circular rail 14 is connected to the motor 13. A plurality of support rods 141 and a plurality of threaded holes 142 are arranged at intervals on the circular rail 14. The support rods 141 and the threaded holes 142 are arranged in one-to-one correspondence. Two support rings 143 are sleeved on each support rod 141, and a hanging ring 144 is suspended on each support ring 143. A threaded filling block 145 matching the threaded hole 142 is arranged in the threaded hole 142. The threaded filling block 145 and the circular rail 14 are made of the same magnetic material. A magnetic inductor 16 and a proximity sensor 17 are provided at the front end of the cylinder 12;
[0030] The magnetic inductor 16, the proximity sensor 17, the cylinder 12, and the motor 13 are respectively electrically connected to the control system 20. Preferably, the balance 15 is electrically connected to the control system 20.
[0031] Preferably, a fixing block 152 is provided on the balance 15, and the concave supporting bar 151 is arranged on the fixing block 152.
[0032] Preferably, the motor 13 is installed on the cylinder 12 through a telescopic column 121, and its up and down movement is controlled by the cylinder 12.
[0033] Preferably, the circular rail 14 is connected to the motor 13 through a coupling 131, and its rotational movement is controlled by the motor 13.
[0034] Preferably, a vertical bar 111 is provided at the front end of the cylinder 12. The magnetic inductor 16 is arranged at the top of the vertical bar 111. A horizontal bar 112 is provided in the middle of the vertical bar 111, and the proximity sensor 17 is arranged on the horizontal bar 112. The height of the vertical bar 111 is adjustable. During use, the magnetic inductor 16 and the threaded hole 142 when the circular rail 14 rotates to the lowest point are at the same height, so as to feed back a signal to the control system when it senses that the threaded filling block 145 is not filled in the threaded hole 142, and control the motor 13 to stop rotating, that is, to control the motor 13 to stop rotating when the position of the injection needle 30 to be weighed is at the lowest point of the circular rail 14. The length of the horizontal bar 112 is adjustable. During use, the length of the horizontal bar 112 is adjusted so that the proximity sensor 17 is exactly located at the lower end of the circular rail 14, so as to sense the feedback signal to the control system 20 when the circular rail 14 descends to the proximity position, thereby controlling the lowest position of the circular rail 14 to descend.
[0035] Preferably, when the threaded filling block 145 is completely screwed into the threaded hole 142, the back of the circular rail 14 is flat.
[0036] Preferably, the distance between the two hanging rings 144 on the support rod 142 is greater than the cross-sectional diameter of the concave supporting bar 151.
[0037] Preferably, the control system 20 includes a control panel 21.
[0038] The working principle of a new type of injection needle circulating cross weighing device of the present invention is described as follows:
[0039] Before the experiment, prepare by demarcating the position of the windproof cover (not shown), placing the control system with the control panel outside the windproof cover, and the rest of the device inside the windproof cover.
[0040] Before placing the windproof cover, adjust the position of the balance 15 so that the balance 15 is located below the circular rail 14, so that when the circular rail 14 descends, the injection needle 30 on the hanging ring can just fall onto the concave supporting bar 151.
[0041] Place the front end and the tail end of an injection needle 30 on a pair of hanging rings. If only one sample injection needle needs to be weighed, suck the target liquid into the sample injection needle and take a reference syringe as a reference. Then place the reference injection needle on a pair of hanging rings and the sample injection needle on another pair of hanging rings.
[0042] Input the position numbers of these two injection needles through the control panel, and at the same time indicate the position number where the reference injection needle is placed, as well as the number of weighing repetitions and the weighing time (i.e., the time the injection needle 30 stays on the concave supporting bar 151). The positions on the circular rail 14 are pre-assigned corresponding numbers in sequence (such as A, B, C, D, etc. in clockwise order). For example, the reference injection needle can be placed at position A and the sample injection needle at position C. At this time, the two threaded filling blocks 145 corresponding to positions A and C on the circular rail 14 can be rotated and removed. The two threaded filling blocks 145 corresponding to positions B and D are kept placed in the threaded holes 142 of the circular rail 14.
[0043] After placing the wind shield, start the operation through the control panel. At this time, the motor 13 starts to operate, driving the circular rail 14 to rotate in a certain predetermined direction (such as counterclockwise). Since the magnetic sensor 16 can interact with the magnetic materials of the circular rail 14 and the threaded filling block 145, and the direction of the magnetic sensor 16 faces the circular rail 14, during the rotation process, by detecting the change in the magnetic field and outputting the corresponding electrical signal to the control panel. When the circular rail 14 with magnetic material is in front of the magnetic sensor 16, the motor 13 can continue to operate and the circular rail 14 remains in a rotating state. When the A position on the circular rail 14 rotates to the lowest point of the circular rail 14, at this time, the front end of the magnetic sensor 16 is the threaded hole 142 (without the threaded filling block 145) of the circular rail 14. At this time, the motor 13 stops operating, and then the cylinder 12 starts to perform a compression operation. In this way, the telescopic column moves downward accordingly, and the circular rail 14 also moves downward accordingly. In this way, the reference injection needle also moves downward until the concave support bar holds the reference injection needle, and the reference injection needle is completely not in contact with the hanging ring (that is, the reference injection needle is located in the middle position of the hanging ring). At this time, the proximity sensor 17 senses the circular rail 14. When the proximity sensor 17 receives the signal, the cylinder 12 stops operating. At this time, the entire device is in a static state. According to the previously input weighing time (about 15s - 20s), the balance 15 has been stabilized. The indication value on the display panel of the balance 15 can be directly read through the control system or read manually, and the record is displayed on the control panel. The weighing indication value of the reference injection needle is recorded as m a1 , and complete a weighing operation.
[0044] After that, the cylinder 12 restarts and starts to perform a rising operation. The telescopic column starts to perform a rising operation. In this way, the circular rail 14 also starts to move vertically upward, and then the hanging ring also moves vertically upward accordingly. As the hanging ring continues to rise, the reference injection needle is re-held by the hanging ring and separated from the concave support bar. When the telescopic column continues to rise and returns to its original position and stops, the circular rail 14 and the reference injection needle also rise and return to their original positions. At this time, the motor 13 restarts and drives the circular rail 14 to start rotating. When the B position on the circular rail 14 rotates to the lowest point, since there is a filling block in the threaded hole 142 corresponding to the B position, the magnetic sensor 16 points to the threaded filling block 145 in the threaded hole 142 of the circular rail 14. Therefore, the circular rail 14 will not stop at the lowest point of the B position and continues to rotate. The hanging ring at the C position is the sample injection needle. When the C position rotates to the lowest point, at this time, the magnetic sensor 16 points to the threaded hole 142 of the circular rail 14. At this time, similar to the operation when the A position is at the lowest point as described above, the sample injection needle is weighed, and the weighing indication value of the sample injection needle is recorded as m c1 , and complete the second weighing operation;
[0045] According to the pre-input weighing repetition times n, as the motor 13 rotates in one direction, the cyclic alternate weighing of the reference injection needle and the sample injection needle is completed, and n sets of reference injection needle masses, that is, m, are obtaineda1 , m a2 …m an , and the quality of the sample injection needles in n groups, namely m c1 , m c2 …m cn . After the weighing is completed, the control system 20 automatically calculates the difference △m in the weighing of the sample injection needle and the reference injection needle x , that is, (m c1 + m c2 + … + m cn ) / n - (m a1 + m a2 + … + m an ) / n. It can also be calculated by manually copying the indication value of the balance 15
[0046] . After the weighing is completed, take out the sample injection needle. At this time, the sample injection needle performs the operation of liquid injection and its quality changes. After the experiment, place the sample injection needle at the original position, that is, position C. According to the above operation steps, the difference in the weighing of the sample injection needle and the reference injection needle is also obtained, that is, △m y , where △m y - △m x is the quality of the liquid injection of the sample injection needle
[0047] . When it is necessary to weigh more than 2 groups of sample injection needles at the same time, for example, when it is necessary to weigh three groups of sample injection needles at the same time, the reference injection needle can be placed at position A, and the first sample injection needle, the second sample injection needle, and the third sample injection needle are placed at positions B, C, and D respectively, and the threaded filling block 145 at the position where the injection needle is placed is taken out, as Figure 2 and Figure 3 shown. Then enter the position number of the reference injection needle and the position numbers of the sample injection needles to be weighed, that is, A, B, C, D, as well as the weighing repetition times and the weighing time on the control panel
[0048] . Perform the weighing operation similar to the above process, and the weighing mass differences between the three sample injection needles and the reference injection needle can be obtained respectively, which are defined as △m x1 = (m b1 + m b2 + … + m bn ) / n - (m a1 + m a2 + … + m an ) / n, △m x2 = (m c1 + m c2 + … + m cn ) / n - (m a1 + m a2 + … + m an ) / n, △mx3 = (m d1 + m d2 + … + m dn ) / n - (m a1 + m a2 + … + m an ) / n. Similarly, after weighing, each sample injection needle is taken out. At this time, each sample injection needle performs the operation of liquid injection and its mass changes. After the experiment, each sample injection needle is placed at its original position, namely its original positions B, C, and D. The weighing operation steps are repeated, and the weighing differences between each sample injection needle and the reference injection needle are also obtained, namely △m y1 、△m y2 、△m y3 , where △m y1 - △m x1 is the mass of the liquid injection of the first sample injection needle, △m y2 - △m x2 is the mass of the liquid injection of the second sample injection needle, and △m y3 - △m x3 is the mass of the liquid injection of the third sample injection needle.
[0049] Preferably, a camera can also be set to photograph the indication value of the balance 15 and save it into the control system to improve the traceability reliability.
[0050] The number of the support rods 141 in the present utility model can be set according to actual needs, such as being set to 4 or 6 or 8, etc., so as to realize the batch weighing operation of the sample injection needles.
[0051] A novel injection needle circulating and cross-weighing device of the present utility model has simple operation. It can place the injection needles in a windproof cover for weighing, and can avoid the influence of air flow on the indication value of the balance caused by the frequent opening and closing of the windproof cover. This device can automatically perform the alternate weighing of the reference injection needle and the sample injection needles, and can obtain multiple groups of weighing results at the same time, solving the problems of low work efficiency and large operation errors brought by manual weighing operations. Through the control system, it automatically calculates the mass difference between the sample injection needles before and after injecting the liquid and the reference injection needle, thereby converting the mass of the liquid injected into the steel cylinder by the injection needles and improving the overall work efficiency.
[0052] Although the specific implementation manners of the present utility model have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present utility model. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present utility model should all be covered by the scope protected by the claims of the present utility model.
Claims
1. A novel injection needle circulation cross weighing device, characterized in that: Including weighing mechanism and control system; The weighing mechanism comprises a base, a cylinder, a motor, a circular rail and a balance, wherein the balance is located at the front end of the base, a concave support bar is arranged on the balance, the cylinder is erected on the base, the motor is mounted on the cylinder, the circular rail is connected to the motor, a plurality of support rods and a plurality of threaded holes are arranged at intervals on the circular rail, the support rods and the threaded holes are arranged one-to-one, each of the support rods is sleeved with two support rings, a hanging ring is hung on each support ring, a threaded filling block matching with the threaded hole is arranged in the threaded hole, the threaded filling block and the circular rail are made of the same magnetic material, and a magnetic sensor and a proximity sensor are arranged at the front end of the cylinder; The magnetic sensor, proximity sensor, cylinder and motor are electrically connected to the control system respectively.
2. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: A fixed block is arranged on the balance, and the concave supporting rod is arranged on the fixed block.
3. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: The motor is installed on the cylinder through a telescopic column, and its up and down movement is controlled by the cylinder.
4. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: The circular rail is connected to the motor through a coupling, and its rotational movement is controlled by the motor.
5. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: A vertical bar is arranged at the front end of the cylinder, the magnetic sensor is arranged at the top of the vertical bar, a horizontal bar is arranged in the middle of the vertical bar, and the proximity sensor is arranged on the horizontal bar.
6. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: The number of the support rods is set to 4, 6 or 8.
7. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: When the thread filler is fully screwed into the threaded hole, the back of the round rail is flat.
8. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: The distance between the two hanging rings on the support rod is greater than the cross-sectional diameter of the concave support rod.
9. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: The control system includes a control panel.
10. A novel injection needle circulation cross weighing device as claimed in claim 1, characterized in that: The balance is electrically connected to the control system.