A device for measuring the number of broken sucker rods

Abstract

The utility model belongs to the device field for measuring the broken number of sucker rod, especially, relate to a kind of broken number of sucker rod measuring device. In order to facilitate the broken number of sucker rod to be judged, the utility model proposes a kind of broken number of sucker rod measuring device, including the base for being fixed on the coil box, the clamping device for clamping the polished rod and the hydraulic jack vertically arranged between base and clamping device, hydraulic jack includes the piston rod of output end top on clamping device and the pressurizing cavity for containing hydraulic oil to exert the force of upward to piston rod, hydraulic jack is equipped with the pressure gauge for measuring the hydraulic oil pressure in pressurizing cavity, to be used for when the clamping device with polished rod is clamped is only smoothly supported by piston rod by the lifting mass corresponding to pressure gauge reading judgment broken number of sucker rod. Broken number can be calculated according to pressure gauge reading, jack specification and sucker rod specification, and it is convenient to judge whether crane operation or pump inspection operation is selected.

Description

Technical Field

[0001] This utility model belongs to the field of devices for measuring the number of broken sucker rods, and in particular relates to a device for measuring the number of broken sucker rods. Background Technology

[0002] When using a beam pumping unit for oil extraction, a matching sucker rod string and a pump are required. The sucker rod string consists of multiple stages of sucker rods connected together, with a polished rod at the top and the pump at the bottom to transmit power. At the oil extraction site, sucker rod string breakage is a frequent occurrence. After a sucker rod string breaks, the section above the breakage point needs to be removed for repair.

[0003] When there are fewer than 20 sucker rods above the break point, a crane is preferred for retrieval. Ordinary workers can assist with the crane to complete the retrieval work, costing approximately a few thousand yuan, which is relatively low-cost. When there are 20 or more sucker rods above the break point, a pump inspection operation is preferred. Ordinary workers report the situation on-site, and professional operators with specialized tools conduct the pump inspection, costing approximately several hundred thousand yuan, which is significantly higher. The reasons for requiring reporting are as follows: Firstly, the sucker rod string above the break point is heavy and may exceed the crane's lifting capacity, making retrieval difficult. Secondly, with a large number of sucker rods, each retrieved rod needs to be removed from the sucker rod string, and the crane must suspend the next rod to prevent accidents caused by the sucker rod string above the wellhead reaching heights of tens of meters, resulting in high labor intensity for workers. Thirdly, ordinary workers, unlike professional operators, lack specialized tools and relevant experience, making them more prone to accidents when performing complex operations with more than 20 sucker rods.

[0004] Therefore, determining the location of the sucker rod breakage is extremely crucial. Currently, methods such as measured dynamometer diagrams, dual pressure curve analysis, current comparison analysis, production comparison analysis, or sucker rod rotation are used to determine the breakage location. Among these, the sucker rod rotation method is the most commonly used.

[0005] The specific operating procedure for the sucker rod rotation method is as follows: First, stop the sucker rod head at the bottom dead center; then, try to rotate the sucker rod string, either by rotating the suspension rope or by clamping the pipe wrench onto the polished rod and then rotating the pipe wrench. If the sucker rod string can be rotated without rebounding, it indicates that the sucker rod string has broken off. At this point, the operator has only rotated the sucker rod string above the breakage point. If less force is applied during rotation, the breakage point is closer to the packing box, and the breakage point is at the top of the sucker rod string; if more force is applied during rotation, the breakage point is closer to the pump, and the breakage point is at the bottom of the sucker rod string.

[0006] However, the sucker rod rotation method cannot accurately determine the number of sucker rods above the breakage point; it can only provide a rough estimate based on worker experience, and cannot yield accurate data. Other methods mentioned above suffer from the same problem. Therefore, it is currently impossible to accurately determine the number of sucker rods above the breakage point on-site, and thus, to determine whether to use a crane for retrieval or a pump inspection operation. Utility Model Content

[0007] The purpose of this invention is to provide a device for measuring the number of sucker rods that have broken off, so as to solve the technical problem that it is currently impossible to accurately determine the number of sucker rods above the break point.

[0008] To achieve the above objectives, the technical solution of the sucker rod breakage number measuring device provided by this utility model is as follows: A device for measuring the number of broken sucker rods includes a base for fixing to a packing box, a clamping device for clamping a polished rod, and a hydraulic jack vertically arranged between the base and the clamping device. The hydraulic jack includes a piston rod with its output end resting on the clamping device and a pressure chamber for containing hydraulic oil to apply an upward force to the piston rod. The hydraulic jack is equipped with a pressure gauge for measuring the pressure of the hydraulic oil in the pressure chamber. The number of broken sucker rods is determined by the lifting mass corresponding to the pressure gauge reading when the clamping device holding the polished rod is only stably supported by the piston rod.

[0009] Furthermore, the hydraulic jack includes a chassis with a centering groove that matches the chassis. The chassis is installed in the centering groove, and the groove wall forms a limiting surface for limiting the horizontal position of the hydraulic jack to ensure that the guide rod moves vertically upward.

[0010] Furthermore, the output end of the piston rod is fixedly connected to the clamping device to ensure that the guide rod moves vertically upward.

[0011] Furthermore, the clamping device is provided with a through hole, and the output end of the piston rod is provided with a threaded hole. After the bolt passes through the through hole, it is threadedly connected to the piston rod through the threaded hole.

[0012] Furthermore, the base includes a clamp and a support plate fixedly connected to the side of the clamp. The clamp is used to hold the packing box to fix the sucker rod breakage measurement device on the packing box, and the support plate is used to support the jack.

[0013] Furthermore, the clamp includes an annular clamp body with a notch and a baffle connected to the upper end face of the annular clamp body. The baffle is used to be set above the packing box and to stop and cooperate with the upper end face of the packing box in the vertical direction. The baffle is provided with a clearance hole for avoiding the guide rod when installing the clamp.

[0014] Furthermore, the clamping device includes a square clamp and a force transmission plate fixedly connected to the square clamp, with the output end of the piston rod pressing against the force transmission plate.

[0015] Furthermore, the clamping device includes a clamping plate, a rotating plate hinged to the side of the clamping plate at one end, and a set screw threaded onto the rotating plate. The side of the clamping plate is provided with a slot for the light rod to enter. The bottom wall of the slot is a semi-circular arc shape to match the light rod. The rotation axis of the rotating plate extends horizontally, and the rotation stroke of the rotating plate has a blocking position for blocking the slot opening and an opening position for opening the slot opening to allow the light rod to enter the slot. When the rotating plate is in the blocking position, the set screw is used to cooperate with the bottom wall of the slot to clamp the light rod; the output end of the piston rod rests on the clamping plate.

[0016] Furthermore, a limiting groove is provided on the upper surface of the card plate, and a card block that matches the limiting groove is connected to the rotating plate. The rotating shafts of the card block and the rotating plate are located on both sides of the set screw. The card block includes a limiting plate and a connecting plate that connects the limiting plate and the card plate. The limiting plate is used to stop the limiting groove along the axial direction of the set screw to counteract the force applied by the set screw to the rotating plate.

[0017] Furthermore, the end of the set screw that extends into the slot is rotatably connected to a clamping block. The clamping block and the slot are guided and slidably engaged along the axial direction of the set screw, and the clamping block is provided with a semi-circular arc groove that engages with the bottom wall of the slot to clamp the guide rod.

[0018] The beneficial effects of the sucker rod breakage number measuring device provided by this utility model are as follows: In this utility model, a hydraulic jack is used to lift the sucker rod column above the breakage point. The lifting pressure of the hydraulic jack can be read through a pressure gauge. The lifting mass can be calculated based on the lifting pressure and the parameters of the hydraulic jack. The number of sucker rods above the breakage point can be obtained by dividing the lifting mass by the mass of each sucker rod, which makes it easier to determine whether to use a crane or a pump inspection.

[0019] In use, first, fix the base to the packing box, clamp the clamping device onto the smooth rod, and place the hydraulic jack between the base and the clamping device; then, pressurize the hydraulic jack, and the piston rod of the hydraulic jack will press against the clamping device; after the clamping device is lifted a short distance, adjust the pressurization pressure to keep the clamping device stationary. At this time, the clamping device holding the smooth rod is only stably supported by the piston rod, so the lifting mass calculated by the pressure gauge reading is approximately equal to the mass of the sucker rod string. By dividing the lifting mass by the mass of each sucker rod, the number of sucker rods above the break point can be obtained. Attached Figure Description

[0020] Figure 1 A schematic diagram of the device for measuring the number of broken sucker rods; Figure 2Front view of the device for measuring the number of broken sucker rods; Figure 3 Top view of the device for measuring the number of broken sucker rods; Figure 4 This is a schematic diagram of the base of the device for measuring the number of broken sucker rods.

[0021] Explanation of reference numerals in the attached figures: 1. Packing box; 2. Clamp; 2-1. Ear plate; 2-2. Baffle; 2-3. Annular hoop; 3. First bolt; 4. Support plate; 4-1. Straightening groove; 5. Hydraulic jack; 5-1. Base plate; 5-2. Pressure gauge; 6. Second bolt; 7. Clamping plate; 8. Clamping block; 9. Top screw; 10. Smooth rod; 11. Clamping block; 12. Hinge shaft; 13. Rotating plate; 14. Slot; 15. Groove. Detailed Implementation

[0022] To address the problems in the background technology, the core inventive concept of this utility model is as follows: a hydraulic jack is used to lift the sucker rod above the breakage point. After stabilization, the weight of the sucker rod is reflected by measuring the hydraulic pressure provided by the hydraulic jack, thereby enabling the calculation of the number of sucker rods that have broken off.

[0023] The present invention will be further described in detail below with reference to an embodiment of the sucker rod breakage number measuring device.

[0024] like Figures 1-4 As shown, in a basic embodiment, the sucker rod breakage number measuring device (hereinafter referred to as the measuring device) includes a base for fixing on the packing box 1, a clamping device for clamping the polished rod 10, and a hydraulic jack 5 vertically arranged between the base and the clamping device. The hydraulic jack 5 includes a piston rod with its output end resting on the clamping device and a pressure chamber for containing hydraulic oil to apply an upward force to the piston rod. The hydraulic jack 5 is equipped with a pressure gauge 5-2 for measuring the pressure of the hydraulic oil in the pressure chamber, so as to determine the number of sucker rod breakages by the lifting mass corresponding to the reading of the pressure gauge 5-2 when the clamping device holding the polished rod 10 is only stably supported by the piston rod.

[0025] The clamping device may include existing clamping components commonly used in the art for clamping the guide rod 10, such as square clamps (also known as load clamps). These clamping components can be used to clamp the guide rod 10 during operations such as adjusting the donkey head, and will not be described in detail here. When the piston rod can directly abut against the clamping component, the piston rod directly abuts against the clamping component, and the clamping component constitutes the clamping device; when the clamping component does not allow the piston rod to directly abut, a force transmission plate can be fixedly connected to these clamping components to form a clamping device, with the output end of the piston rod abutting against the force transmission plate.

[0026] The base may include existing fixing components commonly used for fixing to the packing box 1, such as clamps 2, slips, and clamps. A support plate 4 is connected to the fixing components, and a hydraulic jack 5 sits on the support plate 4. The fixing components can be used to fix to the packing box 1 during operations such as changing packing, which will not be described in detail here.

[0027] Both the hydraulic jack 5 and the pressure gauge 5-2 are purchased externally. The whole set consisting of the hydraulic jack 5 and the pressure gauge 5-2 is also called a digital display pressure gauge hydraulic jack or a hydraulic jack with a pressure gauge, and can be purchased externally as a whole.

[0028] In use, first, remove the cover of the packing box 1 and take out the packing inside the packing box 1. Keep the suspension rope connected to the polished rod and run the walking beam pumping unit to the bottom dead center to ensure the safety of subsequent operations. Then, fix the base on the packing box 1, clamp the clamping device onto the polished rod 10, and place the hydraulic jack 5 between the base and the clamping device. Next, pressurize the hydraulic jack 5, and the piston rod of the hydraulic jack 5 will press against the clamping device. After the clamping device is lifted a short distance, the polished rod 10 will separate from the suspension rope. Adjust the pressurization pressure to keep the clamping device stationary. At this time, the clamping device holding the polished rod 10 is only supported by the piston rod, and the suspension rope no longer supports the polished rod 10. Therefore, the lifting mass calculated by the reading of the pressure gauge 5-2 is approximately equal to the mass of the sucker rod string. By dividing the lifting mass by the mass of each sucker rod, the number of sucker rods above the break point can be obtained.

[0029] The advantage of this utility model is that it applies a digital pressure gauge hydraulic jack to measure the weight of the sucker rod above the break point, so as to reflect the number of sucker rods above the break point. This makes it easier for ordinary workers to determine whether to use a crane for salvage (crane operation) or to report the situation on site and request support from a professional operation team (pump inspection operation).

[0030] The relationship between the reading of pressure gauge 5-2 and the lifting mass is shown in Table 1.

[0031] Table 1. Relationship between pressure gauge readings and lifting capacity. Hydraulic jack specifications Piston diameter (mm) Piston cross-sectional area (mm²) Jack weight (kg) Piston rod diameter (mm) Minimum height (mm) Lifting height (mm) Lifting mass (kg) corresponding to 1 MPa pressure 2T 24 452 2.3 23 148 80 45 3T 30 706 3 28 168 90 71 5T 36 1017 4.2 32 185 115 101 8T 40 1256 5.2 38 195 115 126 In one embodiment, a 2T hydraulic jack 5 (maximum lifting capacity of 2 tons) is used. The lifting capacity corresponding to 1 MPa on the pressure gauge 5-2 is 45 kg. The first-stage sucker rod connected below the polished rod 10 is 1 inch in size. There are approximately 100 1-inch sucker rods, and each 1-inch sucker rod weighs 32.8 kg. The polished rod 10 weighs 47.334 kg.

[0032] For example, when the pressure gauge 5-2 reads 5.6 MPa, the number of sucker rods above the break point is (5.6×45-47.334)÷32.8≈6.24 (rods). Therefore, the sucker rod string breaks off in the upper half of the 7th sucker rod. Since the number of broken rods is less than 20, it is preferable to use a crane for operation.

[0033] For example, when the pressure gauge 5-2 reads 26 MPa, the number of sucker rods above the break point is (26×45-47.334)÷32.8≈34.23 (rods). Therefore, the sucker rod string broke off in the upper half of the 35th sucker rod. The number of broken rods is greater than 20, so it should be reported and a professional operation team should be asked to carry out pump inspection.

[0034] It should be noted that, theoretically, the mass of the sucker rod string can only be obtained by subtracting the mass of the clamping device and the polished rod 10 from the lifting mass. The mass of the sucker rod string can then be divided by the mass of each sucker rod to obtain the number of broken sucker rods. However, the total actual mass of the clamping device and the polished rod 10 is much smaller than the actual mass of the sucker rod string. Therefore, the number of broken sucker rods can be directly obtained by dividing the lifting mass by the mass of each sucker rod. Given that the criterion is whether the number of broken sucker rods is greater than 20, the error between the two calculation methods can be ignored.

[0035] In one embodiment, the upper surface of the support plate 4 is a plane, the lower surface of the force transmission plate is a plane, the hydraulic jack 5 sits on the upper surface of the support plate 4, and the output end of the piston rod rests on the lower surface of the force transmission plate.

[0036] In a preferred embodiment, the hydraulic jack 5 includes a base 5-1, and a straightening groove 4-1 that matches the base 5-1 is provided on the base. The base 5-1 is installed in the straightening groove 4-1. The groove wall of the straightening groove 4-1 forms a limiting surface for limiting the horizontal position of the hydraulic jack 5, so as to prevent slippage between the base and the hydraulic jack 5 and the generation of relative horizontal displacement, thereby ensuring that the smooth rod 10 moves vertically upward.

[0037] Of course, in other embodiments, the hydraulic jack 5 can also be fixedly connected to the base by welding or flange connection to avoid slippage between the base and the hydraulic jack 5 and relative horizontal displacement.

[0038] Furthermore, the output end of the piston rod is fixedly connected to the clamping device to ensure that the polished rod 10 moves vertically upward. This prevents the polished rod 10 from tilting and becoming unevenly worn due to slippage between the output end of the piston rod and the clamping device (or the force transmission plate when there is one). This avoids the situation where there is a large friction between the sucker rod and the tubing due to uneven wear of the polished rod 10, and thus avoids the situation where the actual lifting mass is much greater than the mass of the sucker rod string above the break-off point due to the aforementioned friction, ensuring the accuracy of the measurement.

[0039] In one embodiment, the clamping device (or force transmission plate if there is a force transmission plate) is provided with a through hole, and the output end of the piston rod is provided with a threaded hole. The second bolt 6 passes through the through hole and is threadedly connected to the piston rod through the threaded hole, thereby realizing the fixed connection between the output end of the piston rod and the clamping device.

[0040] Of course, in other embodiments, the output end of the piston rod can also be fixedly connected to the clamping device by welding, plugging, snapping, or other methods.

[0041] Of course, in other embodiments, a piston rod groove matching the output end of the piston rod can also be provided on the clamping device (a force transmission plate when there is a force transmission plate). The output end of the piston rod is inserted into the piston rod groove to avoid relative horizontal displacement between the piston rod and the clamping device, and to avoid uneven wear of the smooth rod 10.

[0042] To facilitate understanding by those skilled in the art, the structure of some optional bases is described in detail below. Of course, those skilled in the art may also choose other types of bases as needed.

[0043] like Figures 1-4 As shown, the base includes a clamp 2, and a support plate 4 is fixedly connected to the side of the clamp 2. The clamp 2 is used to clamp the packing box 1 to fix the measuring device on the packing box 1, and the support plate 4 is used to support the jack. The clamp 2 includes an annular hoop 2-3 with a notch, and ear plates 2-1 are connected to the notch of the annular hoop 2-3. The two ear plates 2-1 can be locked by the first bolt 3 and the nut so that the annular hoop 2-3 clamps the packing box 1.

[0044] When the measuring device lifts the sucker rod, the weight supported by the base (mainly the weight of the sucker rod) typically ranges from several hundred kilograms to two tons. To prevent relative movement between the base and the packing box 1, on the one hand, friction pads with a high coefficient of friction (such as rubber or silicone pads) can be placed on the inner surface of the annular hoop 2-3 to increase the coefficient of friction between the annular hoop 2-3 and the packing box 1; on the other hand, such as... Figures 1-4As shown, a baffle 2-2 can be set on the upper surface of the annular hoop 2-3. The baffle 2-2 is used to be set above the packing box 1 and to stop and cooperate with the upper surface of the packing box 1 in the vertical direction. The baffle 2-2 is provided with a clearance hole for avoiding the light rod 10 when installing the clamp 2, so as to ensure that there is no relative movement between the base and the packing box 1 by using the surface-to-surface stop cooperation between the baffle 2-2 and the packing box 1 in the vertical direction.

[0045] To facilitate understanding by those skilled in the art, the structure of some optional clamping devices is described in detail below. Of course, those skilled in the art may also choose other forms of clamping devices as needed.

[0046] like Figures 1-4 As shown, the clamping device includes a clamping plate 7, a rotating plate 13 hinged at one end to the side of the clamping plate 7 via a hinge shaft 12, and a set screw 9 threaded onto the rotating plate 13. The side of the clamping plate 7 has a slot 14 for the guide rod 10 to enter. The bottom wall of the slot 14 is a semi-circular arc shape to match the guide rod 10. The axis of the hinge shaft 12 extends horizontally, and the rotating plate 13 has a blocking position for sealing the opening of the slot 14 and an opening position for opening the slot 14 to allow the guide rod 10 to enter. When the rotating plate 13 is in the blocking position, the set screw 9 engages with the bottom wall of the slot 14 to clamp the guide rod 10. The output end of the piston rod rests against the clamping plate 7. Alternatively, the clamping plate 7 can be considered as two parts: a part in contact with the piston rod is a force transmission plate, and a part in contact with the guide rod 10 is a clamping plate.

[0047] The hinge shaft 12 can be formed by the threaded portion of a bolt connected to the clamping plate 7, with the bolt head used to prevent the rotating plate 13 from falling off the hinge shaft 12. Of course, the hinge shaft 12 can also be formed by components such as a pin or a cylindrical rod.

[0048] When the set screw 9 engages with the slot 14 and clamps the guide rod 10, the set screw 9 applies a force to the rotating plate 13, causing the rotating plate 13 to move away from the slot 7. When the hinge shaft 12 is composed of the screw portion of a bolt, the bolt head applies an opposite force to the rotating plate 13 to counteract the force of the set screw 9 on the rotating plate 13, thereby enabling the set screw 9 to engage with the slot 14 and stably clamp the guide rod 10. When the hinge shaft 12 is composed of a cylindrical rod, a limiting groove is provided on the upper surface of the slot 7, and a locking block 8 matching the limiting groove is connected to the rotating plate 13. The rotating shafts of the locking block 8 and the rotating plate 13 are located on both sides of the set screw 9. The locking block 8 includes a limiting plate and a connecting plate connecting the limiting plate and the slot 7. The limiting plate is used to engage with the limiting groove along the axial direction of the set screw 9 to counteract the force applied by the set screw 9 to the rotating plate 13.

[0049] Of course, when the hinge shaft 12 is composed of the threaded part of a bolt, the aforementioned limiting groove and locking block 8 can also be provided. When the locking block 8 and the hinge shaft 12 are respectively located at both ends of the rotating plate 13, the force on the rotating plate 13 is more balanced.

[0050] When the set screw 9 is directly pressed against the polished rod 10, if the set screw 9 is not tightened, the set screw 9 will move relative to the polished rod 10 during the lifting process, which will cause the polished rod 10 to be scratched by the set screw 9.

[0051] To avoid the above situation, on the one hand, training can be strengthened to ensure that workers operate the hydraulic jack 5 only after the set screw 9 is tightened; on the other hand, direct contact between the set screw 9 and the polished rod 10 can be avoided, thus solving the problem at its source. Specifically, such as... Figures 1-4 As shown, the end of the set screw 9 that extends into the slot 14 is rotatably connected to a clamping block 11. The clamping block 11 and the slot 14 are slidably guided along the axial direction of the set screw 9, and the clamping block 11 has a semi-circular arc-shaped groove that engages with the bottom wall of the slot 14 to clamp the guide rod. The clamping block 11 can have a cylindrical receiving cavity inside, and a nut connected to the set screw 9 is located inside the cylindrical receiving cavity. The clamping block 11 also has a clearance hole connected to the cylindrical receiving cavity and used to avoid the set screw 9. The diameter of the clearance hole is smaller than the diameter of the nut's maximum circumferential circle to prevent the nut from coming out. When the set screw 9 is tightened, the nut rotates with the set screw 9, thereby driving the clamping block 11 towards the guide rod 10 via the set screw 9, and also driving the clamping block 11 away from the guide rod 10 via the nut.

[0052] Of course, a sliding rail and a slider that cooperate with each other can also be set directly on the clamping block 11 and the slot 14. The set screw 9 is pressed against the clamping block 11 so that the clamping block 11 and the slot 14 can clamp the light rod 10. After loosening the set screw 9, the operator can manually move the clamping block 11 out of the slot 14 along the guide rail.

[0053] Preferably, the end face of the clamping block 11 that contacts the optical rod 10 is provided with an elastic anti-slip pad, such as an anti-slip silicone pad or an anti-slip rubber pad, to increase the friction between the clamping block 11 and the optical rod 10.

[0054] Preferably, such as Figures 1-4 As shown, the rotating plate 13 is also provided with a groove 15 on the side near the clamping block 11, so that the clamping block 11 can be completely withdrawn from the slot 14, and the rotating plate 13 can be rotated after the clamping block 11 is completely withdrawn from the slot 14. At this time, the clamping block 11 can slide and engage with the slot wall of the slot 14 through the dovetail groove and the slider guide.

[0055] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different embodiments to create the embodiments shown in the accompanying drawings. Of course, those skilled in the art can also create other embodiments not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for measuring the number of broken sucker rods, characterized in that, The device includes a base for fixing to a packing box, a clamping device for clamping the sucker rod, and a hydraulic jack vertically arranged between the base and the clamping device. The hydraulic jack includes a piston rod with its output end resting on the clamping device and a pressure chamber for containing hydraulic oil to apply an upward force to the piston rod. The hydraulic jack is equipped with a pressure gauge for measuring the pressure of the hydraulic oil in the pressure chamber, so as to determine the number of sucker rods that have broken off by using the lifting mass corresponding to the pressure gauge reading when the clamping device holding the sucker rod is only stably supported by the piston rod.

2. The device for measuring the number of broken sucker rods as described in claim 1, characterized in that, The hydraulic jack includes a chassis with a centering groove that matches the chassis. The chassis is installed in the centering groove, and the groove wall forms a limiting surface for limiting the horizontal position of the hydraulic jack to ensure that the guide rod moves vertically upward.

3. The device for measuring the number of broken sucker rods as described in claim 1, characterized in that, The output end of the piston rod is fixedly connected to the clamping device to ensure that the guide rod moves vertically upward.

4. The device for measuring the number of broken sucker rods as described in claim 3, characterized in that, The clamping device has a through hole, and the output end of the piston rod has a threaded hole. The bolt passes through the through hole and is threadedly connected to the piston rod through the threaded hole.

5. The device for measuring the number of broken sucker rods as described in any one of claims 1 to 4, characterized in that, The base includes a clamp and a support plate fixedly connected to the side of the clamp. The clamp is used to hold the packing box to fix the sucker rod breakage measurement device on the packing box, and the support plate is used to support the jack.

6. The device for measuring the number of broken sucker rods as described in claim 5, characterized in that, The clamp includes an annular clamp body with a notch and a baffle connected to the upper end face of the annular clamp body. The baffle is used to be set above the packing box and to stop and cooperate with the upper end face of the packing box in the vertical direction. The baffle is provided with a clearance hole for avoiding the smooth rod when installing the clamp.

7. The device for measuring the number of broken sucker rods as described in any one of claims 1 to 4, characterized in that, The clamping device includes a square clamp and a force transmission plate fixedly connected to the square clamp, with the output end of the piston rod pressing against the force transmission plate.

8. The device for measuring the number of broken sucker rods as described in any one of claims 1 to 4, characterized in that, The clamping device includes a clamping plate, a rotating plate hinged to the side of the clamping plate at one end, and a set screw threaded onto the rotating plate. The side of the clamping plate is provided with a slot for the light rod to enter. The bottom wall of the slot is a semi-circular arc shape to match the light rod. The rotation axis of the rotating plate extends horizontally, and the rotation stroke of the rotating plate has a blocking position for blocking the slot opening and an opening position for opening the slot opening to allow the light rod to enter the slot. When the rotating plate is in the blocking position, the set screw is used to cooperate with the bottom wall of the slot to clamp the light rod; the output end of the piston rod rests on the clamping plate.

9. The device for measuring the number of broken sucker rods as described in claim 8, characterized in that, The upper surface of the card plate is provided with a limiting groove, and a card block that matches the limiting groove is connected to the rotating plate. The rotating shafts of the card block and the rotating plate are located on both sides of the set screw. The card block includes a limiting plate and a connecting plate that connects the limiting plate and the card plate. The limiting plate is used to stop the limiting groove along the axial direction of the set screw to counteract the force applied by the set screw to the rotating plate.

10. The device for measuring the number of broken sucker rods as described in claim 8, characterized in that, The end of the set screw that is inserted into the slot is rotatably connected to a clamping block. The clamping block and the slot slide together along the axial direction of the set screw, and the clamping block is provided with a semi-circular arc groove that cooperates with the bottom wall of the slot to clamp the guide rod.

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