Full-automatic rock debris sampling and cleaning device for petroleum logging

Abstract

This utility model provides a fully automatic cuttings sampling and cleaning device for oil logging, relating to the technical field of oil logging sampling and cleaning devices. It includes a housing, inside which a cleaning mechanism is installed. The cleaning mechanism includes several limiting cylinders, each containing the interior of the housing. Two auxiliary bearings are fixedly connected to the inner wall of each limiting cylinder. A rotating cylinder is located inside each limiting cylinder, with the inner wall of the inner ring of each auxiliary bearing fixedly connected to the outer surface of the rotating cylinder. A cleaning cylinder is located inside each rotating cylinder, and several arc-shaped cleaning frames are fixedly connected to the inner wall of each cleaning cylinder. A spiral frame is also located inside each cleaning cylinder. This fully automatic cuttings sampling and cleaning device for oil logging enables better cleaning of cuttings and sand samples during use, ensuring effective cleaning and increasing the accuracy of subsequent cuttings and sand sample testing data.

Description

Technical Field

[0001] This utility model relates to an oil logging sampling and cleaning device, specifically an automatic oil logging cuttings sampling and cleaning device, belonging to the field of oil logging sampling and cleaning technology. Background Technology

[0002] Oil logging technology is the most fundamental technology in oil and gas exploration and development activities. It is the most timely and direct means of discovering and evaluating oil and gas reservoirs, characterized by timely and diverse acquisition of underground information and rapid analysis and interpretation. Oil logging uses methods such as rock and mineral analysis, geophysics, and geochemistry to observe, collect, record, and analyze information on solid, liquid, and gaseous materials returned from the wellbore during the drilling process. This information is used to establish a logging geological profile, discover oil and gas shows, and evaluate oil and gas layers. Since the sand samples collected in the logging are an important basis for identifying stratigraphic lithology, determining stratigraphic positions, and discovering and evaluating oil and gas layers, it is necessary to use an automatic oil logging cuttings sampling and cleaning device to automatically clean the sand samples, facilitating subsequent chemical analysis of the sand samples.

[0003] Existing fully automated cuttings sampling and cleaning devices for oil well logging, while capable of automatically cleaning and sampling cuttings and sand samples, simply rinse the samples with water, resulting in poor cleaning effectiveness. This leaves the cuttings and sand samples with a large amount of sludge, affecting the accuracy of subsequent testing data. Therefore, this paper proposes a fully automated cuttings sampling and cleaning device for oil well logging. Utility Model Content

[0004] This invention proposes a fully automatic oil logging cuttings sampling and cleaning device to solve the problem of poor cleaning effect of cuttings and sand samples in the prior art, which results in a large amount of sludge remaining on the cuttings and sand samples.

[0005] This utility model is achieved through the following technical solution: an automatic oil logging cuttings sampling and cleaning device, including a housing, wherein a cleaning mechanism is provided inside the housing;

[0006] The cleaning mechanism includes several limiting cylinders. Each limiting cylinder has an interior shell. Two auxiliary bearings are fixedly connected to the inner wall of each limiting cylinder. A rotating cylinder is located inside each limiting cylinder. The inner wall of the inner ring of each auxiliary bearing is fixedly connected to the outer surface of the rotating cylinder. A cleaning cylinder is located inside each rotating cylinder. Several arc-shaped cleaning frames are fixedly connected to the inner wall of each cleaning cylinder. A spiral frame is located inside each cleaning cylinder. A first positioning bearing is fixedly connected to the outer surface of each spiral frame. Each first positioning bearing is fixedly embedded in the inner bottom wall of the cleaning cylinder. A second positioning bearing is fixedly embedded in the inner bottom wall of each rotating cylinder. A snap-fit ​​frame is fixedly connected to the inner wall of the inner ring of each second positioning bearing. Each snap-fit ​​frame snaps into the interior of the spiral frame.

[0007] A power assembly is installed inside the housing, and a rotating assembly is installed on top of the housing.

[0008] A fixing frame is fixedly connected to the outer surface of the shell, a funnel is fixedly connected to the left side of the fixing frame, and a water spray pipe is fixedly connected to the inner wall of the fixing frame. The funnel and the water spray pipe are both located above one of the limiting cylinders.

[0009] The bottom surface of the housing is fixedly connected to several support legs, and the bottom surface of the housing is fixedly connected to a drain pipe.

[0010] Two limiting handles are fixedly connected to the outer surface of each of the cleaning cylinders. Each limiting handle is snapped into the inside of the rotating cylinder. Drainage holes are arranged at equal intervals on the outer surface of each rotating cylinder and the outer surface of each cleaning cylinder.

[0011] The power assembly includes a stabilizing bearing, the outer surface of which is fixedly connected to the inner wall of the housing. A large helical gear is fixedly connected to the inner wall of the inner ring of the stabilizing bearing. The inner wall of the large helical gear has equally spaced tooth grooves. A rotating motor is fixedly connected to the inner wall of the housing. A transmission gear is fixedly connected to the output end of the rotating motor. The outer surface of the transmission gear meshes with the tooth grooves. A small helical gear is fixedly connected to the bottom surface of each rotating cylinder. A connecting rod is rotatably connected inside each limiting cylinder. A first bevel gear is fixedly connected to one end of each connecting rod. Each first bevel gear meshes with the large helical gear. A second bevel gear is fixedly connected to the bottom end of each snap-fit ​​bracket. A third bevel gear and a fourth bevel gear are fixedly connected to the outer surface of each connecting rod, respectively. Each third bevel gear meshes with the second bevel gear, and each fourth bevel gear meshes with the small helical gear.

[0012] The rotating assembly includes a limiting disk rotatably connected inside the housing. Each limiting cylinder is slidably connected inside the limiting disk. A stepper motor is fixedly connected to the bottom surface of the housing. A rotating column is fixedly connected to the bottom surface of the limiting disk. The output end of the stepper motor passes through the housing and is fixedly connected to the bottom end of the rotating column. Several support frames are fixedly connected to the bottom surface of the limiting disk. Two support plates are fixedly connected to the outer surface of each limiting cylinder. A pressure spring is fixedly connected to the inner bottom wall of each support frame. A pressure sensor is fixedly connected to the top of each pressure spring. The upper surface of each pressure sensor is fixedly connected to the bottom surface of the support plate. A telescopic rod is provided inside each pressure spring. The bottom end of each telescopic rod is fixedly connected to the inner bottom wall of the support frame. The telescopic end of each telescopic rod is fixedly connected to the bottom surface of the pressure sensor. Each pressure sensor is electrically connected to the stepper motor via a wire.

[0013] This utility model provides a fully automatic cuttings sampling and cleaning device for oil well logging, which has the following beneficial effects:

[0014] This fully automated cuttings sampling and cleaning device for oil logging, through its cleaning mechanism, allows cuttings and sand samples to be rinsed inside the cleaning cylinder. Simultaneously, the power unit drives the rotating cylinder and auger to rotate. The rotation of the rotating cylinder, combined with the friction of the arc-shaped cleaning frame against the cuttings and sand samples, along with the water flow, effectively removes mud from the samples. Furthermore, the rotation of the auger further agitates the cuttings and sand samples inside the cleaning cylinder, causing them to collide and rub against each other, thus more thoroughly removing mud and impurities. This ensures better cleaning of cuttings and sand samples during use, guaranteeing effective cleaning and increasing the accuracy of subsequent cuttings and sand sample testing data. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the shell and support leg structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the shell and limiting plate structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the stepper motor and rotating column structure of this utility model;

[0018] Figure 4 This is a cross-sectional view of the limiting cylinder and support frame of this utility model;

[0019] Figure 5 This is a cross-sectional view of the cleaning cylinder and rotating cylinder of this utility model after they have been unfolded.

[0020] Figure 6 This is a schematic diagram of the second and third bevel gears of this utility model.

[0021] Explanation of reference numerals in the attached figures

[0022] 1. Shell;

[0023] 2. Cleaning mechanism; 201. Limiting cylinder; 202. Auxiliary bearing; 203. Rotating cylinder; 204. Cleaning cylinder; 205. Arc-shaped cleaning frame; 206. Spiral frame; 207. First positioning bearing; 208. Snap-fit ​​frame; 209. Second positioning bearing; 210. Fixing frame; 211. Funnel; 212. Water spray pipe; 213. Support leg; 214. Drain pipe; 215. Limiting handle; 216. Drain hole;

[0024] 3. Power assembly; 301. Sturdy bearing; 302. Large helical gear; 303. Gear groove; 304. Rotating motor; 305. Transmission gear; 306. Small helical gear; 307. Connecting rod; 308. First bevel gear; 309. Second bevel gear; 310. Third bevel gear; 311. Fourth bevel gear;

[0025] 4. Rotating assembly; 401. Limiting plate; 402. Stepper motor; 403. Rotating column; 404. Support frame; 405. Support plate; 406. Compression spring; 407. Telescopic rod; 408. Pressure sensor. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0027] Please see Figures 1-6 This utility model provides a fully automatic oil logging cuttings sampling and cleaning device, including a housing 1. A cleaning mechanism 2 is provided inside the housing 1. Several support legs 213 are fixedly connected to the bottom surface of the housing 1. A drain pipe 214 is fixedly connected to the bottom surface of the housing 1. The support legs 213 can support the position of the device. The drain pipe 214 can ensure that the sewage inside the housing 1 can be smoothly discharged into the sewage recycling equipment for recycling and reuse.

[0028] Please refer to this carefully. Figure 2 and Figure 4The cleaning mechanism 2 includes several limiting cylinders 201. Each limiting cylinder 201 is located inside the housing 1. Two auxiliary bearings 202 are fixedly connected to the inner wall of each limiting cylinder 201. A rotating cylinder 203 is located inside each limiting cylinder 201. The inner wall of the inner ring of each auxiliary bearing 202 is fixedly connected to the outer surface of the rotating cylinder 203. A cleaning cylinder 204 is located inside each rotating cylinder 203. A fixing frame 210 is fixedly connected to the outer surface of the housing 1. The left side of the fixing frame 210 is fixedly... A funnel 211 is fixedly connected to the inner wall of a fixed frame 210, and a water spray pipe 212 is fixedly connected to the inner wall of the fixed frame 210. Both the funnel 211 and the water spray pipe 212 are located above one of the limiting cylinders 201. The fixed frame 210 can fix the position of the funnel 211 and the water spray pipe 212. The funnel 211 can ensure that the oil logging cuttings sample in the sand separator falls smoothly into the cleaning cylinder 204. Using the water spray pipe 212 connected to the water supply equipment, clean water can be sprayed into the cleaning cylinder 204 to ensure that the cuttings cleaning work can be carried out normally.

[0029] Please refer to this carefully. Figure 4 , Figure 5 and Figure 6 Each cleaning cylinder 204 has several arc-shaped cleaning frames 205 fixedly connected to its inner wall. Each cleaning cylinder 204 has a spiral frame 206 inside. A first positioning bearing 207 is fixedly connected to the outer surface of each spiral frame 206. Each first positioning bearing 207 is fixedly embedded in the inner bottom wall of the cleaning cylinder 204. Each rotating cylinder 203 has a second positioning bearing 209 fixedly embedded in its inner bottom wall. A snap-fit ​​bracket 208 is fixedly connected to the inner wall of the inner ring of each second positioning bearing 209. Each snap-fit ​​bracket 208 snaps into the interior of the spiral frame 206. Two limiting handles 215 are fixedly connected to the outer surface of each cleaning cylinder 204. Each limiting handle 215 is snapped into the inside of the rotating cylinder 203. The outer surface of each rotating cylinder 203 and the outer surface of each cleaning cylinder 204 are provided with drainage holes 216 arranged at equal intervals. The limiting handle 215 not only makes it convenient for workers to lift the cleaning cylinder 204 upwards and remove the cleaned rock debris inside, but also, since the limiting handle 215 is inside the rotating cylinder 203, it can fix the position between the cleaning cylinder 204 and the rotating cylinder 203, preventing relative rotation between the cleaning cylinder 204 and the rotating cylinder 203. The drainage holes 216 can ensure that the sewage in the cleaning cylinder 204 and the rotating cylinder 203 can be smoothly discharged into the shell 1.

[0030] Please refer to this carefully. Figure 3 , Figure 4 , Figure 5 and Figure 6The housing 1 houses a power assembly 3, which includes a stabilizing bearing 301. The outer surface of the stabilizing bearing 301 is fixedly connected to the inner wall of the housing 1. A large helical gear disc 302 is fixedly connected to the inner wall of the inner ring of the stabilizing bearing 301. The inner wall of the large helical gear disc 302 has equally spaced tooth grooves 303. A rotary motor 304 is fixedly connected to the inner wall of the housing 1. A transmission gear 305 is fixedly connected to the output end of the rotary motor 304. The outer surface of the transmission gear 305 meshes with the tooth grooves 303. Each rotating cylinder 203... Each of the following components has a small helical gear 306 fixedly connected to its bottom surface. A connecting rod 307 is rotatably connected inside each limiting cylinder 201. A first bevel gear 308 is fixedly connected to one end of each connecting rod 307. Each first bevel gear 308 meshes with a large helical gear 302. A second bevel gear 309 is fixedly connected to the bottom end of each locking bracket 208. A third bevel gear 310 and a fourth bevel gear 311 are fixedly connected to the outer surface of each connecting rod 307. Each third bevel gear 310 meshes with a second bevel gear 309. Each fourth bevel gear 311 meshes with the small helical gear disk 306. Power provided by the rotating motor 304, combined with the transmission gear 305 and the stabilizing bearing 301, drives the large helical gear disk 302 to rotate. This, in turn, drives the connecting rod 307 to rotate via the first bevel gear 308. The connecting rod 307, with the assistance of the second positioning bearing 209, can then rotate using the third bevel gear 310 to drive the locking bracket 208. Since the locking bracket 208 is rectangular and locked inside the screw carrier 206, it can drive the screw carrier... With the assistance of the first positioning bearing 207, the 206 rotates. Then, when the connecting rod 307 rotates, it drives the rotating cylinder 203 to rotate through the fourth bevel gear 311 and the small helical gear plate 306. With the assistance of the auxiliary bearing 202, the rotating cylinder 203 can rotate smoothly inside the limiting cylinder 201. At the same time, due to the limiting handle 215, when the rotating cylinder 203 rotates, it can drive the cleaning cylinder 204 and the arc-shaped cleaning frame 205 to rotate, ensuring the smooth progress of the deep cleaning of rock debris and sand samples.

[0031] Please refer to this carefully. Figure 3 and Figure 4A rotating assembly 4 is provided on the top of the housing 1. The rotating assembly 4 includes a limiting disk 401, which is rotatably connected to the inside of the housing 1. Each limiting cylinder 201 is slidably connected to the inside of the limiting disk 401. A stepper motor 402 is fixedly connected to the bottom surface of the housing 1. A rotating column 403 is fixedly connected to the bottom surface of the limiting disk 401. The output end of the stepper motor 402 passes through the housing 1 and is fixedly connected to the bottom end of the rotating column 403. Several support frames 404 are fixedly connected to the bottom surface of the limiting disk 401. Two support plates are fixedly connected to the outer surface of each limiting cylinder 201. 405. Each support frame 404 has a pressure spring 406 fixedly connected to its inner bottom wall. Each pressure spring 406 has a pressure sensor 408 fixedly connected to its top. The upper surface of each pressure sensor 408 is fixedly connected to the bottom surface of the support plate 405. Each pressure spring 406 has a telescopic rod 407 inside. The bottom end of each telescopic rod 407 is fixedly connected to the inner bottom wall of the support frame 404, and the telescopic end of each telescopic rod 407 is fixedly connected to the bottom surface of the pressure sensor 408. Each pressure sensor 408 is connected to a stepper motor 402 via a wire. In the connection, when the rock cuttings and sand samples in the sand separator are discharged into one of the washing cylinders 204 through the funnel 211, as the weight increases, the washing cylinder 204 and the rotating cylinder 203 will drive the limiting cylinder 201 to move downward through the auxiliary bearing 202. During the downward movement of the limiting cylinder 201, pressure is applied to the pressure sensor 408 through the support plate 405 and the support frame 404. At the same time, the pressure spring 406 is forced to contract with the assistance of the telescopic rod 407. The elasticity of the pressure spring 406 can prevent the pressure sensor 408 from being crushed, while the telescopic rod 407 cooperates with... The support plate 405 and support frame 404 can prevent the limiting cylinder 201 from rotating, allowing it to move only up and down. When the pressure sensor 408 reaches the set value, it can send an electrical signal to the stepper motor 402 and the sand separator via a wire, causing the sand separator to stop sand prevention. After about five minutes of cleaning process of rock debris and sand samples in the cleaning cylinder 204, the stepper motor 402 starts working, driving the limiting plate 401 to rotate a certain angle through the rotating column 403, moving another cleaning cylinder 204 to the bottom of the funnel 211, realizing the automatic sampling of multiple batches of rock debris and sand samples.

[0032] In use, the following steps are taken: First, connect the rotary motor 304, stepper motor 402, and pressure sensor 408 to an external power supply and controller. Then, install the device below the sand separator, aligning the sand separator's outlet with the funnel 211. This allows the rock fragments and sand sample from the vibrating screen to smoothly enter the washing cylinder 204 after being separated by the sand separator. The power provided by the rotary motor 304, combined with the transmission gear 305 and the stabilizing bearing 301, drives the large helical gear disc 302 to rotate. This, in turn, drives the connecting rod 307 to rotate via the first bevel gear 308. At this time, the connecting rod 307, with the assistance of the second positioning bearing 209, can rotate the clamping frame 208 using the third bevel gear 310. Since the clamping frame 208 is rectangular and clamped inside the screw frame 206, it can also drive the screw frame 206 to rotate with the assistance of the first positioning bearing 207. When the connecting rod 307 rotates... The fourth bevel gear 311 can also drive the rotating cylinder 203 to rotate via the small helical gear plate 306. With the assistance of the auxiliary bearing 202, the rotating cylinder 203 can rotate smoothly inside the limiting cylinder 201. At the same time, due to the limiting handle 215, the rotating cylinder 203 can drive the cleaning cylinder 204 and the arc-shaped cleaning frame 205 to rotate when it rotates. The friction of the rock cuttings and sand samples by the arc-shaped cleaning frame 205, combined with the water flow, can better remove the mud on the rock cuttings and sand samples. Furthermore, the rotation of the spiral frame 206 can further agitate the rock cuttings and sand samples inside the cleaning cylinder 204, causing the rock cuttings and sand samples to collide and rub against each other, thereby more thoroughly removing the mud and impurities on the rock cuttings and sand samples. This allows the fully automatic rock cuttings sampling and cleaning device for oil logging to better clean the rock cuttings and sand samples during use, ensuring the cleaning effect of the rock cuttings and sand samples and increasing the accuracy of subsequent rock cuttings and sand sample test data.

[0033] When the rock cuttings and sand samples in the sand separator are discharged into one of the washing cylinders 204 through the funnel 211, as the weight increases, the washing cylinder 204 and the rotating cylinder 203 will drive the limiting cylinder 201 to move downward through the auxiliary bearing 202. During the downward movement of the limiting cylinder 201, pressure is applied to the pressure sensor 408 through the support plate 405 and the support frame 404. At the same time, the pressure spring 406 is forced to contract with the assistance of the telescopic rod 407. The elasticity of the pressure spring 406 can prevent the pressure sensor 408 from being crushed, while the telescopic rod 407 cooperates with the support... Plate 405 and support frame 404 can prevent the limiting cylinder 201 from rotating, allowing it to move only up and down. When the pressure sensor 408 reaches the set value, it can send an electrical signal to the stepper motor 402 and the sand separator via a wire, causing the sand separator to stop sand prevention. After about five minutes of cleaning process of rock debris and sand samples in the cleaning cylinder 204, the stepper motor 402 starts to work, driving the limiting plate 401 to rotate a certain angle through the rotating column 403, moving another cleaning cylinder 204 to the bottom of the funnel 211, realizing the automatic sampling of multiple batches of rock debris and sand samples.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fully automatic oil logging cuttings sampling and cleaning device, comprising a housing (1), characterized in that: The housing (1) is equipped with a cleaning mechanism (2); The cleaning mechanism (2) includes several limiting cylinders (201), each limiting cylinder (201) having an interior of the housing (1), and two auxiliary bearings (202) fixedly connected to the inner wall of each limiting cylinder (201). Each limiting cylinder (201) has a rotating cylinder (203) inside, and the inner wall of the inner ring of each auxiliary bearing (202) is fixedly connected to the outer surface of the rotating cylinder (203). Each rotating cylinder (203) has a cleaning cylinder (204) inside, and several arc-shaped cleaning rings are fixedly connected to the inner wall of each cleaning cylinder (204). The washing rack (205) has a spiral frame (206) inside each of the washing cylinders (204). A first positioning bearing (207) is fixedly connected to the outer surface of each spiral frame (206). Each first positioning bearing (207) is fixedly embedded in the inner bottom wall of the washing cylinder (204). A second positioning bearing (209) is fixedly embedded in the inner bottom wall of each rotating cylinder (203). A snap-fit ​​bracket (208) is fixedly connected to the inner wall of the inner ring of each second positioning bearing (209). Each snap-fit ​​bracket (208) is snapped into the inside of the spiral frame (206). The housing (1) is equipped with a power assembly (3) inside and a rotating assembly (4) is provided above the housing (1).

2. The fully automatic oil logging cuttings sampling and cleaning device according to claim 1, characterized in that: A fixing frame (210) is fixedly connected to the outer surface of the housing (1). A funnel (211) is fixedly connected to the left side of the fixing frame (210). A water spray pipe (212) is fixedly connected to the inner wall of the fixing frame (210). The funnel (211) and the water spray pipe (212) are both located above one of the limiting cylinders (201).

3. The fully automatic oil logging cuttings sampling and cleaning device according to claim 1, characterized in that: The bottom surface of the housing (1) is fixedly connected to several support legs (213), and the bottom surface of the housing (1) is fixedly connected to a drain pipe (214).

4. The fully automatic oil logging cuttings sampling and cleaning device according to claim 1, characterized in that: Two limiting handles (215) are fixedly connected to the outer surface of each of the cleaning cylinders (204). Each of the limiting handles (215) is snapped into the inside of the rotating cylinder (203). Drainage holes (216) are arranged at equal intervals on the outer surface of each of the rotating cylinders (203) and the outer surface of each of the cleaning cylinders (204).

5. The fully automatic oil logging cuttings sampling and cleaning device according to claim 1, characterized in that: The power assembly (3) includes a stabilizing bearing (301), the outer surface of which is fixedly connected to the inner wall of the housing (1). A large helical gear disk (302) is fixedly connected to the inner wall of the inner ring of the stabilizing bearing (301). The inner wall of the large helical gear disk (302) has equally spaced tooth grooves (303). A rotating motor (304) is fixedly connected to the inner wall of the housing (1). A transmission gear (305) is fixedly connected to the output end of the rotating motor (304). The outer surface of the transmission gear (305) meshes with the tooth grooves (303). A small helical gear disk (306) is fixedly connected to the bottom surface of each rotating cylinder (203). The limiting cylinder (201) is rotatably connected to a connecting rod (307). One end of each connecting rod (307) is fixedly connected to a first bevel gear (308). Each first bevel gear (308) is meshed with a large helical gear disc (302). The bottom end of each snap-fit ​​bracket (208) is fixedly connected to a second bevel gear (309). The outer surface of each connecting rod (307) is fixedly connected to a third bevel gear (310) and a fourth bevel gear (311). Each third bevel gear (310) is meshed with a second bevel gear (309). Each fourth bevel gear (311) is meshed with a small helical gear disc (306).

6. The fully automatic oil logging cuttings sampling and cleaning device according to claim 1, characterized in that: The rotating assembly (4) includes a limiting disk (401), which is rotatably connected to the inside of the housing (1). Each limiting cylinder (201) is slidably connected to the inside of the limiting disk (401). A stepper motor (402) is fixedly connected to the bottom surface of the housing (1). A rotating column (403) is fixedly connected to the bottom surface of the limiting disk (401). The output end of the stepper motor (402) passes through the housing (1) and is fixedly connected to the bottom end of the rotating column (403). Several support frames (404) are fixedly connected to the bottom surface of the limiting disk (401). Two support plates (405) are fixedly connected to the outer surface of each limiting cylinder (201). Each support frame (404) has a pressure spring (406) fixedly connected to its inner bottom wall. Each pressure spring (406) has a pressure sensor (408) fixedly connected to its top end. The upper surface of each pressure sensor (408) is fixedly connected to the bottom surface of the support plate (405). Each pressure spring (406) has a telescopic rod (407) inside it. The bottom end of each telescopic rod (407) is fixedly connected to the inner bottom wall of the support frame (404). The telescopic end of each telescopic rod (407) is fixedly connected to the bottom surface of the pressure sensor (408). Each pressure sensor (408) is electrically connected to the stepper motor (402) through a wire.

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