Liquid sampling and metering device

Abstract

The utility model discloses a liquid sampling and metering device, which relates to the field of liquid sampling and comprises a device main body, the device main body comprises a device shell, a sampling mechanism is arranged in the lower end of the device shell and comprises a liquid pumping shell, and a middle support is fixed in the middle of the liquid pumping shell. A transmission shaft is rotationally connected between the liquid pumping shell and the top of the middle support, a driving column is fixed to the transmission shaft, a wavy annular groove is formed in the driving column, a plurality of piston columns are slidably connected to the middle support in a sealed mode, one ends of the piston columns are slidably connected with the annular groove in the driving column, and a driving mechanism is arranged on one side of the liquid pumping shell. The driving mechanism drives the transmission shaft to rotate. The device has the beneficial effects that the piston column is driven to ascend and descend in the rotating process of the driving column, and the ascending and descending distance of the piston column is determined by the annular wave groove in the driving column, so that liquid sampling errors caused by manual operation are avoided, and it is guaranteed that the liquid sample collection amount is the same every time.

Description

Technical Field

[0001] The utility model relates to the field of liquid sampling, in particular to a liquid sampling and metering device. Background Art

[0002] Liquid is one of the three major states of matter. It has no definite shape and is often affected by the container. However, its volume is fixed under the condition of constant pressure and temperature. When conducting detection and analysis on liquids, a metering device is often required to quantitatively transfer the liquid, and the accuracy of the metering device often directly determines the accuracy of the detection and analysis results.

[0003] For example, the patent document with the publication number CN217605383U discloses a liquid sampling and metering device, including a sampling bucket. A metering member is fixedly connected to the front side of the sampling bucket. The metering member is provided with a metering mechanism. The metering mechanism includes a slider, two straight shafts, a support plate, a connecting block, a pointer, a blocking component, and a locking component. The metering member is provided with a slot. A chute is provided at the rear side of the slot. The slider is slidably connected to the chute up and down. The two straight shafts are slidably arranged on the front side of the slider back and forth. The support plate is fixedly connected to the front side of the two straight shafts. The connecting block is fixedly connected to the front side of the support plate. The pointer is fixedly connected to the right side of the connecting block. Scale lines are provided on the front side of the metering member. The blocking component is fixedly arranged on the upper side of the connecting block. The locking component is arranged in the slot. Quantitative metering is carried out through the metering mechanism, reducing the error existing in quantitative sampling, increasing the accuracy of sampling, and meeting the current use requirements. In the prior art, most small liquid sampling and metering devices use manual pulling of the piston rod to suck the liquid sample into the device. However, in actual operation, it is difficult for manual operation to accurately control the amount of the liquid sample, and the situation of error in the collected amount of the liquid sample often occurs. Therefore, a liquid sampling and metering device that can accurately control the collected amount of the liquid sample is needed. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a liquid sampling and metering device to solve the above problems.

[0005] The present utility model realizes the above purpose through the following technical solutions:

[0006] A liquid sampling and metering device, comprising a device main body, the device main body includes a device housing, a sampling mechanism is arranged inside the lower end of the device housing, the sampling mechanism includes a liquid extraction housing fixedly connected to the device housing, an intermediate support is fixedly connected in the middle of the liquid extraction housing, a transmission shaft is rotatably connected between the liquid extraction housing and the top of the intermediate support, a driving column is fixedly connected to the transmission shaft, a wavy annular groove is arranged on the driving column, a plurality of piston columns evenly arranged in a circumferential direction are hermetically slidably connected to the intermediate support, one ends of the plurality of piston columns are slidably connected to the annular groove on the driving column, the lower ends of the piston columns are hollow, communication holes are arranged on the piston columns, one-way valves are installed in the piston columns, and a driving mechanism is arranged on one side of the liquid extraction housing for driving the transmission shaft to rotate.

[0007] Preferably, a partition is fixedly connected to the middle of the device housing, a sample storage bottle is threadedly connected above the partition, the sample storage bottle is made of a transparent material and is provided with scales on its surface, a liquid extraction pipe is fixedly connected to the bottom of the device housing, a handle is fixedly connected to one side of the device housing, a first communication pipe is fixedly connected to the middle of the partition, and one end of the first communication pipe is communicated with the inside of the sample storage bottle.

[0008] Preferably, a liquid inlet pipe is fixedly connected to the lower end on one side of the liquid extraction housing, a liquid discharge pipe is fixedly connected to the upper end on one side of the liquid extraction housing, the liquid inlet pipe is communicated with the space below the intermediate support, the liquid discharge pipe is communicated with the space above the intermediate support, and the other end of the liquid inlet pipe is fixedly connected to the liquid extraction pipe.

[0009] Preferably, a third communication pipe is fixedly connected to one side of the device housing, the other end of the third communication pipe is communicated with the outside, a second communication pipe is fixedly connected to the outside of the liquid discharge pipe, and a three-way valve is fixedly connected between the first communication pipe, the second communication pipe and the third communication pipe.

[0010] Preferably, the other end of the liquid extraction pipe is in interference fit with an extension pipe, and the extension pipe is made of a plastic material.

[0011] Preferably, a first bevel gear is fixedly connected to one end of the transmission shaft, a second bevel gear is rotatably connected to one side of the device housing, the second bevel gear meshes with the first bevel gear, a turntable is fixedly connected to one side of the second bevel gear, a connecting rod is eccentrically rotatably connected to the turntable, one end of the connecting rod is rotatably connected to an L-shaped sliding rod, the L-shaped sliding rod is slidably connected to the device housing, and a spring is fixedly connected between the L-shaped sliding rod and the handle.

[0012] The beneficial effects are as follows:

[0013] 1. Through the setting of the driving column and the piston column, during the rotation of the driving column, the piston column is driven to rise and fall. The rising and falling distance of the piston column is determined by the annular wavy groove on the driving column, thereby avoiding the error of liquid sampling caused by manual operation, ensuring that the liquid volume of each sampling is the same, and the setting of multiple piston columns ensures the sampling efficiency.

[0014] 2. Through the arrangement of the driving mechanism, when the second bevel gear rotates one week, the transmission shaft rotates a certain angle. During the rotation of the transmission shaft, one piston column can be lifted and lowered only once. In this way, the staff can judge the sampling volume of the liquid sample sent into the sample storage bottle according to the number of times the L-shaped slide bar moves.

[0015] The additional technical features and their advantages of the present utility model will be more clearly described in the following description content, or can be understood through the specific practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the following specific implementation manners, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is a perspective view of a liquid sampling and metering device according to the present utility model;

[0018] Figure 2 is a perspective view of the relative position of the L-shaped slide bar and the device housing of a liquid sampling and metering device according to the present utility model;

[0019] Figure 3 is a front sectional view of a liquid sampling and metering device according to the present utility model;

[0020] Figure 4 is a perspective view of the relative position of the three-way valve and the device housing of a liquid sampling and metering device according to the present utility model;

[0021] Figure 5 is a perspective view of the relative position of the piston column and the driving column of a liquid sampling and metering device according to the present utility model;

[0022] Figure 6 is Figure 3 an enlarged view of part A in

[0023] Figure 7 is a perspective view of the driving mechanism structure of a liquid sampling and metering device according to the present utility model.

[0024] The description of the reference numerals is as follows:

[0025] 101. Device housing; 102. Grip; 103. Sample storage bottle; 104. Liquid extraction tube; 105. Partition board; 106. First connecting pipe; 107. Second connecting pipe; 108. Third connecting pipe; 109. Three-way valve; 110. Extension pipe; 201. Liquid extraction housing; 202. Liquid inlet pipe; 203. Liquid discharge pipe; 204. Intermediate bracket; 205. Piston rod; 206. Communication hole; 207. Transmission shaft; 208. Driving column; 209. Check valve; 301. First bevel gear; 302. Second bevel gear; 303. Turntable; 304. Connecting rod; 305. L-shaped slide bar; 306. Spring. Detailed implementation manners

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] As Figures 1 - 7As shown in the figure, a liquid sampling and metering device includes a device main body. The device main body includes a device housing 101. Inside the lower end of the device housing 101, a sampling mechanism is provided. The sampling mechanism includes a liquid extraction housing 201 bolted and fixedly connected to the device housing 101. In the middle of the liquid extraction housing 201, an intermediate bracket 204 is welded and fixedly connected. Between the top of the liquid extraction housing 201 and the intermediate bracket 204, a transmission shaft 207 is rotatably connected by a bearing. A driving column 208 is key-connected to the transmission shaft 207. The driving column 208 is provided with a wavy annular groove. Three piston columns 205 evenly arranged in a circle are hermetically and slidably connected to the intermediate bracket 204. One end of several piston columns 205 is slidably connected to the annular groove on the driving column 208. The lower end of the piston column 205 is hollow. A communication hole 206 is opened on the piston column 205. A one-way valve 209 is installed inside the piston column 205. On one side of the liquid extraction housing 201, a driving mechanism is provided. The driving mechanism is used to drive the transmission shaft 207 to rotate. The transmission shaft 207 drives one of the piston columns 205 to move. When the piston column 205 moves downward, the one-way valve 209 is opened under the action of liquid pressure. The liquid below the intermediate bracket 204 flows into the piston column 205. The piston column 205 rises, and the liquid inside it flows into the upper part of the intermediate bracket 204 through the communication hole 206. And during the rising process of the piston column 205, the space above the intermediate bracket 204 decreases and the space below increases. In this way, the liquid from the outside can be sucked into the liquid extraction housing 201, and the liquid in the liquid extraction housing 201 can also be sent into the sample storage bottle 103. Since the moving distance of the piston column 205 is determined by the annular wavy groove on the driving column 208, the error of liquid sampling caused by manual operation is avoided, ensuring that the liquid volume of each sampling is the same, and the setting of multiple piston columns 205 ensures the sampling efficiency.

[0030] An intermediate partition 105 is welded and connected to the middle of the device housing 101. A sample storage bottle 103 is threadedly and hermetically connected above the intermediate partition 105. In this way, the sample storage bottle 103 can be conveniently removed after sampling and the sample storage bottle 103 and the liquid sample inside it can be transported. The sample storage bottle 103 is made of a transparent material and is provided with scales on its surface. In this way, the collection situation of the liquid sample in the sample storage bottle 103 can be clearly observed. A liquid extraction pipe 104 is fixedly connected to the bottom of the device housing 101. A handle 102 is fixedly connected to one side of the device housing 101. A first communication pipe 106 is fixedly connected to the middle of the intermediate partition 105. One end of the first communication pipe 106 is communicated with the inside of the sample storage bottle 103. The other end of the liquid extraction pipe 104 is in interference fit with an extension pipe 110. The extension pipe 110 is made of plastic material. When the sampling depth is relatively deep and the liquid extraction pipe 104 cannot reach it, the extension pipe 110 can be connected to the liquid extraction pipe 104 to reach the target sampling depth. When sampling, the staff holds the handle 102 to send the liquid extraction pipe 104 to the target sampling position, operates the driving mechanism, starts the sampling mechanism, and sends the liquid sample into the sample storage bottle 103 through the first communication pipe 106.

[0031] One lower end of one side of the liquid extraction outer shell 201 is fixedly connected with a liquid inlet pipe 202, and one upper end of one side of the liquid extraction outer shell 201 is fixedly connected with a liquid discharge pipe 203. The liquid inlet pipe 202 communicates with the space below the middle support 204, and the liquid discharge pipe 203 communicates with the space at the top of the middle support 204. The other end of the liquid inlet pipe 202 is fixedly connected with the liquid sampling pipe 104. When the piston rod 205 moves, the sampling device extracts the liquid sample near the port of the liquid sampling pipe 104 into the space below the middle support 204 through the liquid inlet pipe 202, and the liquid sample in the space above the middle support 204 leaves the sampling mechanism through the liquid discharge pipe 203.

[0032] One side of the device outer shell 101 is fixedly connected with a third communication pipe 108, and the other end of the third communication pipe 108 communicates with the outside. The outside of the liquid discharge pipe 203 is fixedly connected with a second communication pipe 107. A three-way valve 109 is fixedly connected in a sealed manner between the first communication pipe 106, the second communication pipe 107, and the third communication pipe 108. The three-way valve 109 can control the flow direction of the liquid sample passing through the second communication pipe 107 to the third communication pipe 108 or the first communication pipe 106. Before sampling, rotate the three-way valve 109 to connect the second communication pipe 107 with the third communication pipe 108. After the sampling mechanism moves for a period of time and all the air inside the device is exhausted and the liquid starts to be discharged, rotate the three-way valve 109 to connect the second communication pipe 107 with the first communication pipe 106, and the sampling mechanism continues to work to send the liquid sample into the sample storage bottle 103.

[0033] One end of the transmission shaft 207 is fixedly connected with a first bevel gear 301. One side of the device outer shell 101 is rotatably connected with a second bevel gear 302. The second bevel gear 302 meshes with the first bevel gear 301. When the second bevel gear 302 rotates one week, it drives the first bevel gear 301 to rotate 120 o , one side of the second bevel gear 302 is fixedly connected with a turntable 303. An eccentric connecting rod 304 is rotatably connected to the turntable 303. One end of the connecting rod 304 is rotatably connected with an L-shaped sliding rod 305. The L-shaped sliding rod 305 is slidably connected with the device outer shell 101. A spring 306 is fixedly connected between the L-shaped sliding rod 305 and the handle 102. When a staff member applies a force to the L-shaped sliding rod 305, the L-shaped sliding rod 305 is forced to slide. At this time, the spring 306 is compressed. The L-shaped sliding rod 305 drives the connecting rod 304 to move, the connecting rod 304 drives the turntable 303 to rotate, the turntable 303 drives the second bevel gear 302 to rotate, the second bevel gear 302 drives the first bevel gear 301 to rotate, and the first bevel gear 301 drives the transmission shaft 207 to rotate.

[0034] Working principle: Before sampling, turn the three-way valve 109 to connect the second connecting pipe 107 with the third connecting pipe 108. When sampling, the staff holds the grip 102 and sends the liquid extraction pipe 104 to the target sampling position. Then, the staff applies force to the L-shaped sliding rod 305 with their fingers. The L-shaped sliding rod 305 is forced to slide, and at this time, the spring 306 is compressed. The L-shaped sliding rod 305 drives the connecting rod 304 to move, the connecting rod 304 drives the turntable 303 to rotate, the turntable 303 drives the second bevel gear 302 to rotate, the second bevel gear 302 drives the first bevel gear 301 to rotate, the first bevel gear 301 drives the transmission shaft 207 to rotate, the transmission shaft 207 drives one of the piston columns 205 to move. When the piston column 205 moves downward, the one-way valve 209 opens under the action of liquid pressure, and the liquid below the middle bracket 204 flows into the piston column 205. The piston column 205 rises, and the liquid therein flows into the upper part of the middle bracket 204 through the communication hole 206. During the rising process of the piston column 205, the upper space of the middle bracket 204 decreases and the lower space increases. In this way, the external liquid can be sucked into the liquid extraction housing 201 from the liquid inlet pipe 202, and the liquid in the liquid extraction housing 201 can also be sent into the second connecting pipe 107 from the liquid discharge pipe 203. At the beginning, the gas in the sampling mechanism is discharged from the third connecting pipe 108. After the sampling mechanism moves for a period of time and all the internal air is discharged and starts to discharge liquid, turn the three-way valve 109 to connect the second connecting pipe 107 with the first connecting pipe 106, and the sampling mechanism continues to work to send the liquid sample into the sample storage bottle 103. In this way, the liquid sampling work is completed. Since the moving distance of the piston column 205 is determined by the annular wave groove on the driving column 208, the error of liquid sampling caused by manual operation is avoided, ensuring that the liquid volume of each sampling is the same, and the setting of multiple piston columns 205 ensures the sampling efficiency.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A liquid sampling and metering device, comprising a device body, characterized in that: The device body comprises a device housing (101), a sampling mechanism is arranged inside the lower end of the device housing (101), the sampling mechanism comprises a liquid extraction housing (201) fixedly connected to the device housing (101), an intermediate bracket (204) is fixedly connected in the middle of the liquid extraction housing (201), a transmission shaft (207) is rotatably connected between the liquid extraction housing (201) and the top of the intermediate bracket (204), a driving column (208) is fixedly connected to the driving shaft (207), and a wave The intermediate bracket (204) is sealed and slidably connected with a plurality of piston columns (205) evenly arranged on a circumference, one end of the plurality of piston columns (205) is slidably connected with the annular groove on the driving column (208), the lower end of the piston column (205) is arranged to be hollow, a connecting hole (206) is provided on the piston column (205), a one-way valve (209) is installed in the piston column (205), and a driving mechanism is provided on one side of the liquid extraction housing (201), and the driving mechanism is used to drive the transmission shaft (207) to rotate.

2. A liquid sampling and metering device according to claim 1, characterized in that: A partition (105) is fixedly connected in the middle of the device housing (101), and a sample storage bottle (103) is threadedly connected on the upper side of the partition (105). The sample storage bottle (103) is made of transparent material and has a scale on its surface. A liquid collection tube (104) is fixedly connected to the bottom of the device housing (101), and a handle (102) is fixedly connected to one side of the device housing (101). A first connecting tube (106) is fixedly connected in the middle of the partition (105), and one end of the first connecting tube (106) is connected to the inside of the sample storage bottle (103).

3. A liquid sampling and metering device according to claim 2, characterized in that: A liquid inlet pipe (202) is fixedly connected to the lower end of one side of the liquid extraction housing (201), and a liquid discharge pipe (203) is fixedly connected to the upper end of one side of the liquid extraction housing (201); the liquid inlet pipe (202) is in communication with the lower space of the intermediate support (204), and the liquid discharge pipe (203) is in communication with the top space of the intermediate support (204); the other end of the liquid inlet pipe (202) is fixedly connected to the liquid extraction pipe (104).

4. A liquid sampling and metering device according to claim 3, characterized in that: A third connecting pipe (108) is fixedly connected to one side of the device housing (101); the other end of the third connecting pipe (108) is connected to the outside; a second connecting pipe (107) is fixedly connected to the outside of the liquid discharge pipe (203); and a three-way valve (109) is fixedly connected between the first connecting pipe (106), the second connecting pipe (107), and the third connecting pipe (108).

5. A liquid sampling and metering device according to claim 2, characterized in that: The other end of the liquid extraction tube (104) is interference-fitted with an extension tube (110), and the extension tube (110) is made of plastic material.

6. A liquid sampling and metering device according to claim 2, characterized in that: One end of the transmission shaft (207) is fixedly connected to a first bevel gear (301); one side of the device housing (101) is rotatably connected to a second bevel gear (302); the second bevel gear (302) is meshed with the first bevel gear (301); one side of the second bevel gear (302) is fixedly connected to a rotating disk (303); a connecting rod (304) is eccentrically rotatably connected to the rotating disk (303); one end of the connecting rod (304) is rotatably connected to an L-shaped sliding rod (305); the L-shaped sliding rod (305) is slidably connected to the device housing (101); and a spring (306) is fixedly connected between the L-shaped sliding rod (305) and the handle (102).

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