A sampler for oilfield drilling mud detection

Abstract

The utility model relates to the technical field of oilfield drilling, and discloses a sampler for oilfield drilling mud detection, including a sampler, a transmission mechanism, a storage mechanism, an adjustment mechanism and a positioning mechanism, wherein the transmission mechanism is located at the top of the sampler, the storage mechanism is located at the top of the transmission mechanism and is fixedly connected to the top of the transmission mechanism, the adjustment mechanism is fixedly installed at the top of the storage mechanism, and the positioning mechanism is located at the front side of the adjustment mechanism. The problem that the sampler does not have a driving structure when in use, so the staff needs to drill the mud layer by manual rotation, which is a cumbersome process that consumes a certain amount of time and energy of the user, and after drilling the mud layer, the sampler itself cannot quickly sample and store the mud layer, thereby reducing the use effect of the sampler and the convenience of sampling the mud layer.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil field drilling, in particular to a sampler used for oil field drilling mud detection. Background Art

[0002] In the process of oilfield drilling, mud testing plays an important role. Mud testing can provide information about the bottom of the well, including rock properties, formation pressure, bottom of the well temperature, etc. This information is very critical for determining drilling parameters and operating methods, and helps to ensure the safety and efficiency of the drilling process. Mud testing can help engineers detect and prevent the occurrence of well leakage in a timely manner. By monitoring parameters such as mud density, viscosity and rheology, signs of well leakage can be detected in a timely manner, and appropriate measures can be taken to prevent them. The performance of mud is crucial to drilling operations. Through mud testing, parameters such as mud density, viscosity, pH value, and filtration water loss can be monitored and adjusted to ensure that the performance of the drilling fluid meets the requirements, thereby ensuring the smooth progress of drilling operations. Suspended solids (cuttings) in the mud have an important impact on drilling operations. Mud testing can help determine the cuttings content and particle size distribution in the mud, thereby optimizing the suspension and transportation of cuttings, reducing wellbore plugging and equipment wear. Mud testing helps to evaluate the stability of the wellbore and adjust drilling parameters in a timely manner to ensure the stability of the wellbore. By monitoring parameters such as the wellbore wall pressure and wellbore stability, problems such as wellbore collapse and wellbore rupture can be prevented. In summary, mud testing plays a vital role in the oilfield drilling process, which can help engineers fully understand the downhole conditions and ensure the safety and efficiency of drilling operations.

[0003] The sampler for oilfield drilling mud testing is usually a tool called a mud sampler or mud sampler. This tool is usually designed in a tubular shape, can enter the well through the drilling pipe, and can collect mud samples for analysis. The main function of the mud sampler is to regularly collect mud samples during the drilling process for laboratory analysis and testing. These samples usually include data on solid particles, liquid components, and other important parameters in the mud. Through the analysis of these samples, engineers can evaluate the performance of the drilling fluid, the bottom of the well, and possible problems, so as to adjust the drilling parameters in time and ensure the smooth progress of the drilling operation. The mud sampler usually has a certain degree of closure to ensure that the collected samples are not affected by external contamination or other impurities in the mud during the collection process. In addition, some advanced mud samplers may also have a real-time monitoring function, which can measure some key parameters of the sample in real time while sampling to provide more timely and accurate data. The problem with the above technology is that the sampler does not have a driving structure when in use, so the staff needs to drill the mud layer by manual rotation. The process is relatively cumbersome and will consume a certain amount of time and energy of the user. After drilling the mud layer, the sampler itself cannot quickly sample and store the mud layer, thereby reducing the use effect of the sampler and the convenience of sampling the mud layer. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a sampler for oilfield drilling mud detection which can overcome the above problems or at least partially solve the above problems.

[0005] The utility model is implemented as follows: a sampler for oilfield drilling mud detection comprises a sampler, a transmission mechanism, a storage mechanism, an adjustment mechanism and a positioning mechanism, wherein the transmission mechanism is located at the top of the sampler, the storage mechanism is located at the top of the transmission mechanism and is fixedly connected to the top of the transmission mechanism, the adjustment mechanism is fixedly installed on the top of the storage mechanism, and the positioning mechanism is located at the front side of the adjustment mechanism; the transmission mechanism is used to drive the sampler for use; the storage mechanism is used to store mud liquid; the adjustment mechanism is used to adjust the position of the storage mechanism; and the positioning mechanism is used to fix the extended state of the adjustment mechanism.

[0006] In order to improve the use effect of the sampler, preferably, the transmission mechanism includes a fixed block, a mounting frame and an output motor, the fixed block is located at the top of the sampler, the mounting frame is located at the rear side of the output motor and is fixedly connected to the rear side of the output motor, the rear side of the mounting frame is fixedly installed with the inner cavity of the fixed block by bolts, the output motor is located in the inner cavity of the fixed block, the output end at the bottom of the output motor is rotatably connected to the inner wall of the fixed block, the bottom of the output motor is fixedly connected to the top of the sampler, and by setting the transmission mechanism, the output motor can achieve the effect of being stably installed in a specific position for output through the mutual cooperation of the mounting frame and the fixed block, and the output motor can quickly drill the mud layer through the sampler during the output process, thereby improving the use effect of the sampler.

[0007] In order to improve the storage effect of the mud, preferably, the storage mechanism includes a storage tank, a cover plate and a sealing gasket, the cover plate is located on the top of the fixed block and is fixedly installed with the top of the fixed block by bolts, the sealing gasket is located on the top of the cover plate and is fixedly connected to the top of the cover plate, the storage tank is located on the top of the cover plate and the sealing gasket and is tightly fitted with the surface of the sealing gasket. By setting up the storage mechanism, the storage tank can achieve the effect of quickly feeding and storing the mud through the mutual cooperation of the cover plate and the sealing gasket, and the cover plate and the sealing gasket can quickly seal the bottom of the storage tank after they are tightly fitted with the inner cavity at the bottom of the storage tank.

[0008] In order to improve the opening and closing effect of the storage mechanism, preferably, the adjusting mechanism includes a connecting rod, a supporting frame, a spring and a limiting plate, the bottom of the connecting rod is fixedly connected to the top of the sealing gasket, the bottom of the spring is fixedly connected to the top of the sealing gasket, the limiting plate is located in the inner cavity of the storage tank and is fixedly connected to the inner cavity of the storage tank, the inner cavity of the limiting plate is movably connected to the surface of the connecting rod, the bottom of the limiting plate is fixedly connected to the top of the spring, the inner ring of the spring contacts the surface of the connecting rod, the supporting frame is located at the top of the storage tank and is fixedly connected to the bottom of the storage tank, by setting the adjusting mechanism, the connecting rod can quickly drive the sealing gasket and the cover plate to dock and open and close with the bottom of the storage tank, and during the docking process, the sealing gasket will compress the spring through mutual cooperation with the limiting plate, and when the connecting rod is released, the elastic rebound of the spring will quickly drive the cover plate and the sealing gasket to separate from the docking with the storage tank, thereby achieving the effect of rapid material discharge.

[0009] In order to improve the positioning effect of the adjustment mechanism, preferably, the positioning mechanism includes a positioning rod, a movable block and a tension spring, the front side of the tension spring is fixedly connected to the rear side of the movable block, the front side of the positioning rod is fixedly connected to the rear side of the movable block, the rear side of the tension spring is fixedly connected to the front side of the support frame, the positioning rod, the movable block and the tension spring are all located on the front side of the support frame, and by setting the positioning mechanism, after the cover plate and the sealing gasket are driven to fit tightly with the bottom of the storage tank through the connecting rod, the position of the connecting rod can be quickly positioned through the mutual cooperation of the positioning rod and the support frame, thereby avoiding the situation where the cover plate and the sealing gasket cannot be fixed after docking with the storage tank.

[0010] In order to improve the movement stability of the movable block and the positioning rod, preferably, the left and right sides of the movable block are fixedly connected with plug-in rods, the surface of the plug-in rods is sleeved with plug-in blocks, and the rear side of the plug-in blocks is fixedly connected to the front side of the support frame. By setting the plug-in rods and the plug-in blocks, the plug-in blocks can assist the positioning rod and the movable block to move along a certain movement trajectory through the plug-in rods.

[0011] In order to improve the docking effect of the positioning rod, preferably, a connecting hole is opened on the front side of the support frame, and positioning grooves are opened on the top and bottom of the front side of the connecting rod. The rear side of the positioning rod passes through the connecting hole and extends to the inner cavity of the positioning groove. By setting the connecting hole and the positioning groove, the connecting hole can enable the positioning rod to quickly dock with the positioning groove. The two positioning grooves are distributed up and down, so that the cover plate and the sealing gasket can be quickly positioned through the cooperation between the positioning rod and the positioning groove after being controlled by the connecting rod to dock or detach with the storage tank.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model provides a sampler, a transmission mechanism, a storage mechanism, an adjustment mechanism and a positioning mechanism. The top of the connecting rod is held by hand, and the bottom of the sampler is docked with the mud layer area to be drilled through the connecting rod. After docking, the rotating motor is started, and the rotating motor drives the sampler to rotate rapidly through its own output end, and the sampler can drill the mud layer during the high-speed rotation. After drilling to a certain extent, the mud will penetrate into the inner cavity of the storage tank through the openings at the top and bottom of the storage tank. After the inner cavity of the storage tank is filled with mud, the movable block is pulled, and the movable block drives the positioning rod to move and stretch the tension spring. After the positioning rod moves to the inner cavity that is out of the top positioning groove, the connecting rod is pulled to move upward, and the supporting frame and the storage tank need to be prevented from following the movement during the upward movement of the connecting rod. During the movement, the connecting rod drives the sealing gasket and the cover plate to dock with the bottom of the storage tank, and the sealing gasket is inserted into the inner cavity of the storage tank. When the cam is in the closed position, the spring is pulled back to allow the cam to move forward and the locking cam is engaged with the locking cam, thereby releasing the locking cam and allowing the cam to move forward and the locking cam is engaged with the locking cam, thereby releasing the locking cam and allowing the cam to move backward and the locking cam is engaged with the locking cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a three-dimensional structure provided by an embodiment of the utility model;

[0015] Figure 2 It is a cross-sectional view provided by the embodiment of the utility model;

[0016] Figure 3 It is a cross-sectional view of the embodiment of the utility model provided from the right side;

[0017] Figure 4 The utility model embodiment provides Figure 1 A partial enlarged view of the middle A;

[0018] Figure 5 The utility model embodiment provides Figure 3 A partial enlarged view of point B in the middle.

[0019] In the figure: 1. sampler; 2. transmission mechanism; 3. storage mechanism; 4. adjustment mechanism; 5. positioning mechanism; 201. fixed block; 202. mounting bracket; 203. output motor; 301. storage tank; 302. cover plate; 303. sealing gasket; 401. connecting rod; 402. support frame; 403. spring; 404. limit plate; 501. positioning rod; 502. movable block; 503. tension spring; 6. plug-in rod; 7. plug-in block; 8. connecting hole; 9. positioning groove. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0021] The structure of the utility model is described in detail below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 5As shown, a sampler for oilfield drilling mud detection provided by an embodiment of the utility model comprises a sampler 1, a transmission mechanism 2, a storage mechanism 3, an adjustment mechanism 4 and a positioning mechanism 5, wherein the transmission mechanism 2 is located at the top of the sampler 1, the storage mechanism 3 is located at the top of the transmission mechanism 2 and is fixedly connected to the top of the transmission mechanism 2, the adjustment mechanism 4 is fixedly installed on the top of the storage mechanism 3, and the positioning mechanism 5 is located at the front side of the adjustment mechanism 4; the transmission mechanism 2 is used to drive the sampler 1 for use; the storage mechanism 3 is used to store mud liquid; the adjustment mechanism 4 is used to adjust the position of the storage mechanism 3; the positioning mechanism 5 is used to fix the extended state of the adjustment mechanism 4, the transmission mechanism 2 comprises a fixing block 201, a mounting frame 202 and an output motor 203, and a fixing block 201 is provided on the storage mechanism 3; the fixing block 202 is provided on the storage mechanism 3; the fixing block 203 is provided on the storage mechanism 3; the fixing block 204 is provided on the storage mechanism 3; the fixing block 205 is provided on the storage mechanism 3; the fixing block 206 is provided on the storage mechanism 3; the fixing block 207 is provided on the storage mechanism 3; the fixing block 208 is provided on the storage mechanism 3; the fixing block 209 is provided on the storage mechanism 3; the fixing block 201 ...8 is provided on the storage mechanism 3; the fixing block 209 is provided on the storage mechanism 3; the fixing block 209 is provided on the storage mechanism 3; the fixing block The fixed block 201 is located at the top of the sampler 1, the mounting frame 202 is located at the rear side of the output motor 203 and is fixedly connected to the rear side of the output motor 203, the rear side of the mounting frame 202 is fixedly installed with the inner cavity of the fixed block 201 by bolts, the output motor 203 is located in the inner cavity of the fixed block 201, the output end at the bottom of the output motor 203 is rotatably connected to the inner wall of the fixed block 201, and the bottom of the output motor 203 is fixedly connected to the top of the sampler 1. By setting the transmission mechanism 2, the output motor 203 can be stably installed at a specific position for output through the mutual cooperation of the mounting frame 202 and the fixed block 201, and the output motor 203 can quickly irrigate the mud layer through the sampler 1 during the output process. Drilling, so as to improve the use effect of the sampler 1, the storage mechanism 3 includes a storage tank 301, a cover plate 302 and a sealing gasket 303, the cover plate 302 is located on the top of the fixed block 201 and is fixedly installed with the top of the fixed block 201 by bolts, the sealing gasket 303 is located on the top of the cover plate 302 and is fixedly connected to the top of the cover plate 302, the storage tank 301 is located on the top of the cover plate 302 and the sealing gasket 303 and is tightly fitted with the surface of the sealing gasket 303. By setting the storage mechanism 3, the storage tank 301 can achieve the effect of quickly feeding and storing the mud through the mutual cooperation of the cover plate 302 and the sealing gasket 303. After the cover plate 302 and the sealing gasket 303 are tightly fitted with the inner cavity at the bottom of the storage tank 301, they can be quickly The regulating mechanism 4 has the function of sealing the bottom of the storage tank 301. The regulating mechanism 4 includes a connecting rod 401, a supporting frame 402, a spring 403 and a limiting plate 404. The bottom of the connecting rod 401 is fixedly connected to the top of the sealing gasket 303, the bottom of the spring 403 is fixedly connected to the top of the sealing gasket 303, the limiting plate 404 is located in the inner cavity of the storage tank 301 and is fixedly connected to the inner cavity of the storage tank 301, the inner cavity of the limiting plate 404 is movably connected to the surface of the connecting rod 401, the bottom of the limiting plate 404 is fixedly connected to the top of the spring 403, the inner circle of the spring 403 contacts the surface of the connecting rod 401, the supporting frame 402 is located at the top of the storage tank 301 and is fixedly connected to the bottom of the storage tank 301. By setting the regulating mechanism 4,The connecting rod 401 can quickly drive the sealing gasket 303 and the cover plate 302 to dock and open and close with the bottom of the storage tank 301, and during the docking process, the sealing gasket 303 will compress the spring 403 through the cooperation with the limit plate 404. When the connecting rod 401 is released, the elastic rebound of the spring 403 will quickly drive the cover plate 302 and the sealing gasket 303 to separate from the docking with the storage tank 301, so as to achieve the effect of rapid discharge. The positioning mechanism 5 includes a positioning rod 501, a movable block 502 and a tension spring 503. The front side of the spring 503 is fixedly connected to the rear side of the movable block 502, the front side of the positioning rod 501 is fixedly connected to the rear side of the movable block 502, the rear side of the tension spring 503 is fixedly connected to the front side of the support frame 402, the positioning rod 501, the movable block 502 and the tension spring 503 are all located at the front side of the support frame 402, and the positioning mechanism 5 is set. After the cover plate 302 and the sealing gasket 303 are closely fitted to the bottom of the storage tank 301 through the connecting rod 401, the positioning rod 501 and the support frame 402 can cooperate with each other to achieve rapid alignment of the connecting rod 401 is positioned to avoid the situation that the cover plate 302 and the sealing gasket 303 cannot be fixed after docking with the storage tank 301. The left and right sides of the movable block 502 are fixedly connected with the plug rod 6. The surface of the plug rod 6 is sleeved with a plug block 7. The rear side of the plug block 7 is fixedly connected to the front side of the support frame 402. By setting the plug rod 6 and the plug block 7, the plug block 7 can assist the positioning rod 501 and the movable block 502 to move according to a certain activity trajectory through the plug rod 6. The front side of the support frame 402 is provided with a plug rod 6. The connection hole 8 and the top and bottom of the front side of the connection rod 401 are provided with positioning grooves 9. The rear side of the positioning rod 501 passes through the connection hole 8 and extends to the inner cavity of the positioning groove 9. By setting the connection hole 8 and the positioning groove 9, the connection hole 8 plays a role in enabling the positioning rod 501 to quickly dock with the positioning groove 9. The two positioning grooves 9 are distributed up and down, and can achieve the role of quickly positioning through the cooperation between the positioning rod 501 and the positioning groove 9 after the cover plate 302 and the sealing gasket 303 are docked or separated with the storage tank 301 through the connection rod 401.

[0023] The working principle of this utility model:

[0024] When in use, hold the top of the connecting rod 401, and use the connecting rod 401 to dock the bottom of the sampler 1 with the mud layer area that needs to be drilled. After docking, start the rotating motor, and the rotating motor will drive the sampler 1 to rotate rapidly through its own output end. The sampler 1 can drill the mud layer during the high-speed rotation. After drilling to a certain extent, the mud will penetrate into the inner cavity of the storage tank 301 through the openings at the top and bottom of the storage tank 301. After the inner cavity of the storage tank 301 is filled with mud, pull the movable block 502, and the movable block 502 will drive the positioning rod 501 to move and stretch the tension spring 503. After the positioning rod 501 moves to the inner cavity of the top positioning groove 9, it pulls the connecting rod 401 to move upward. In the process of the connecting rod 401 moving upward, it is necessary to prevent the support frame 402 and the storage tank 301 from following the movement. In the process of moving, the connecting rod 401 will drive the sealing gasket 303 and the cover plate 302 to dock with the bottom of the storage tank 301. In the process of inserting the sealing gasket 303 into the inner cavity of the storage tank 301, the spring 403 will be engaged with the limiting plate 404 to prevent the sealing gasket 303 from being engaged with the spring 403. 3 is compressed. After the cover plate 302 and the sealing gasket 303 are completely connected with the bottom of the storage tank 301, the movable block 502 is released, and the tension of the tension spring 503 is contracted, which will quickly drive the movable block 502 and the positioning rod 501 to reset. During the resetting process, the positioning rod 501 will cooperate with the connecting hole 8 and insert into the inner cavity of the bottom positioning groove 9, so as to achieve the effect of stably sealing the bottom of the storage tank 301. In this way, the sampler 1 and the storage mechanism 3 can be taken out. When the mud in the storage tank 301 needs to be taken out, the movable block 502 is pulled again. The movable block 502 causes the positioning rod 501 to be separated from the docking with the bottom positioning groove 9. After the positioning rod 501 is separated from the inner cavity of the positioning groove 9, the compressed spring 403 will rebound quickly, and through the cooperation with the limit plate 404, the sealing gasket 303 and the cover plate 302 can be quickly separated from the inner cavity of the storage tank 301 and the mud can be discharged. The movable block 502 is released, and the tension of the tension spring 503 is contracted, which will drive the positioning rod 501 to be inserted into the inner cavity of the top positioning groove 9 through the movable block 502 again, so as to achieve the fixing effect of ensuring the open and closed state of the storage tank 301.

[0025] The specific model and specifications of the rotating motor proposed in this application need to be selected and determined based on the actual specifications of the device. The specific selection calculation method, line connection method and control method all adopt the existing technology in this field, so they will not be described in detail.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] The above description is only a preferred embodiment of the utility model, and does not constitute any form of limitation to the utility model. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent will not depart from the scope of the technical solution of the utility model.

Claims

1. A sampler for oilfield drilling mud detection, comprising a sampler (1), a transmission mechanism (2), a storage mechanism (3), an adjustment mechanism (4) and a positioning mechanism (5), characterized in that: The transmission mechanism (2) is located at the top of the sampler (1); the storage mechanism (3) is located at the top of the transmission mechanism (2) and is fixedly connected to the top of the transmission mechanism (2); the adjustment mechanism (4) is fixedly mounted on the top of the storage mechanism (3); and the positioning mechanism (5) is located at the front side of the adjustment mechanism (4); The transmission mechanism (2) is used to drive the sampler (1) for use; The storage mechanism (3) is used to store mud liquid; The adjusting mechanism (4) is used to adjust the position of the storage mechanism (3); The positioning mechanism (5) is used to fix the extended state of the adjustment mechanism (4).

2. A sampler for oilfield drilling mud detection as claimed in claim 1, characterized in that: The transmission mechanism (2) comprises a fixed block (201), a mounting frame (202) and an output motor (203); the fixed block (201) is located at the top of the sampler (1); the mounting frame (202) is located at the rear side of the output motor (203) and is fixedly connected to the rear side of the output motor (203); the rear side of the mounting frame (202) is fixedly mounted to the inner cavity of the fixed block (201) by bolts; the output motor (203) is located in the inner cavity of the fixed block (201); the output end at the bottom of the output motor (203) is rotatably connected to the inner wall of the fixed block (201); and the bottom of the output motor (203) is fixedly connected to the top of the sampler (1).

3. A sampler for oilfield drilling mud detection as claimed in claim 2, characterized in that: The storage mechanism (3) comprises a storage tank (301), a cover plate (302) and a sealing gasket (303); the cover plate (302) is located on the top of the fixing block (201) and is fixedly mounted to the top of the fixing block (201) by means of bolts; the sealing gasket (303) is located on the top of the cover plate (302) and is fixedly connected to the top of the cover plate (302); the storage tank (301) is located on the top of the cover plate (302) and the sealing gasket (303) and is tightly fitted to the surface of the sealing gasket (303).

4. A sampler for oilfield drilling mud detection as claimed in claim 3, characterized in that: The regulating mechanism (4) comprises a connecting rod (401), a supporting frame (402), a spring (403) and a limiting plate (404); the bottom of the connecting rod (401) is fixedly connected to the top of the sealing gasket (303); the bottom of the spring (403) is fixedly connected to the top of the sealing gasket (303); the limiting plate (404) is located in the inner cavity of the storage tank (301) and is fixedly connected to the inner cavity of the storage tank (301); the inner cavity of the limiting plate (404) is movably connected to the surface of the connecting rod (401); the bottom of the limiting plate (404) is fixedly connected to the top of the spring (403); the inner ring of the spring (403) contacts the surface of the connecting rod (401); and the supporting frame (402) is located at the top of the storage tank (301) and is fixedly connected to the bottom of the storage tank (301).

5. A sampler for oilfield drilling mud detection as claimed in claim 4, characterized in that: The positioning mechanism (5) comprises a positioning rod (501), a movable block (502) and a tension spring (503); the front side of the tension spring (503) is fixedly connected to the rear side of the movable block (502); the front side of the positioning rod (501) is fixedly connected to the rear side of the movable block (502); the rear side of the tension spring (503) is fixedly connected to the front side of the support frame (402); the positioning rod (501), the movable block (502) and the tension spring (503) are all located on the front side of the support frame (402).

6. A sampler for oilfield drilling mud detection as claimed in claim 5, characterized in that: The left and right sides of the movable block (502) are both fixedly connected with plug-in rods (6), the surface of the plug-in rods (6) is sleeved with a plug-in block (7), and the rear side of the plug-in block (7) is fixedly connected to the front side of the support frame (402).

7. A sampler for oilfield drilling mud detection as claimed in claim 5, characterized in that: A connecting hole (8) is provided on the front side of the support frame (402), positioning grooves (9) are provided on the top and bottom of the front side of the connecting rod (401), and the rear side of the positioning rod (501) passes through the connecting hole (8) and extends to the inner cavity of the positioning groove (9).

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