Mechanically-geared, reverse-tower oil pumping unit with tensioner

Abstract

The application discloses a mechanical commutation tower type oil pumping machine with a tensioning device and relates to the technical field of oil production. The mechanical commutation tower type oil pumping machine comprises a driving device installed on a well platform below a tower and a power transmission device. The upper chain wheel tensioning device is installed on the inner side of the tower. The upper chain wheel is transversely installed on the cylinder cover on the top of the piston rod of the oil cylinder by the chain wheel shaft. The chain link clamping device pulls the roller set in the sliding groove on the one side of the bottom of the counterweight. While the chain link clamping device rotates one circle around the upper chain wheel and the lower chain wheel, the counterweight is driven to make up-down reciprocating movement in the tower for one time. The roller assembly on the chain link clamping device also reciprocates in the sliding groove for one time. The application can realize timely and moderate tensioning of the worn, loosened and lengthened chain, and ensures that the chain tension does not affect the long-period stable operation of the oil pumping machine.

Description

Technical Field

[0001] This invention relates to the field of tower pumping units, specifically a mechanically reversing tower pumping unit with a tensioning device. Background Technology

[0002] Tower pumping units eliminate the walking beam, consisting only of a tower and a platform. They use belts and belt rollers, or chains and wire ropes, to convert the circular motion of the electric motor into the vertical linear motion of the sucker rod. These tower pumping units typically have the electric motor and reducer mounted on a platform at the top of the tower. Later, they evolved to mount the electric motor and reducer on a well platform below the tower.

[0003] The authorization announcement date is May 19, 2023, authorization announcement number is 219045406U, and the technical solution of the Chinese invention patent entitled "Tower-type bottom-mounted power pumping unit" describes that "the main technical features of the tower-type bottom-mounted power pumping unit are: the main sprocket is installed on one side of the lower part of the frame, the upper sprocket is installed on the outside of the shaft seat, and the guide wheel is installed on the right end of the platform; one end of the power chain is fixed to the upper end of the counterweight, passes around the upper sprocket, goes down and then around the main sprocket and turns back up, and the end is fixed to the lower end of the counterweight; one end of the belt is fixed to the upper end of the counterweight, and the other end passes around the belt roller, crosses the guide wheel and connects downward to the sucker rod hanger."

[0004] The applicant's patent application No. 202311639190.7 describes a "mechanically reversing tower pumping unit," which is also a bottom-mounted power pumping unit and a mechanically reversing pumping unit. That is, it uses a mechanical structure to change the circular motion of the motor into the vertical linear motion of the counterweight of the tower pumping unit to complete the vertical linear reciprocating motion of the sucker rod. Compared with the initial use of reversible motor reversing, it has achieved a technological breakthrough and iteration. Based on the above technology, an improved technical solution, "A Multifunctional Mechanical Device for Oil Production System" (ZL 2024 2 2132443.8), has been developed, which includes mechanical reversing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a mechanically reversing tower pumping unit with a tensioning device, so as to achieve convenient adjustability, especially to adjust the tension of the chain in a timely and appropriate manner without stopping the machine, thereby achieving long-term safe production.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mechanically reversing tower pumping unit with a tensioning device, comprising a drive unit and a power transmission device installed on a well platform 29 below the tower 14, characterized in that: an upper sprocket tensioning device 16 is installed inside the tower 14, and the upper sprocket 15 is horizontally mounted on the cylinder cover 163 at the top of the piston rod 165 of the cylinder 167 by a sprocket shaft 161; the chain clamp 24 on the chain 18 pulls the roller assembly 23 in the slide groove 25 on one side of the bottom of the counterweight 22, and while the chain clamp 24 rotates around the upper sprocket 15 and the lower sprocket 30 for one revolution, it drives the counterweight 22 to reciprocate up and down once inside the tower 14, and the roller assembly 23 on the chain clamp 24 also reciprocates once inside the slide groove 25. The upper sprocket tensioning device 16 includes a hydraulic cylinder 167 and a cylinder seat 166 mounted on a fixed frame 17. A pair of sprocket shaft brackets 162 are welded to the cylinder head 163. The cylinder head 163 is fixed to the upper end of the piston rod 165 by a set of cylinder head bolts 164. The sprocket shaft 161 is installed in the sprocket shaft bracket 162. An upper sprocket 15 is installed at one end of the sprocket shaft 161. When the piston rod 165 moves upward, it will push the upper sprocket 15 to move upward synchronously and tension the chain 165. 8; The mechanical reversing device also includes a slide groove 25 structure, which is installed at the bottom of the counterweight 22 and is surrounded by an upper slide rail 263, a lower slide rail 262 and two slide groove columns 261, and a chain clamp 24 installed on the roller assembly 23 in the slide groove 25; the roller spindle 242 of the chain clamp 24 is installed in the main frame shaft hole 236 in the middle of the roller main frame 232, and the chain clamp 24 is assembled on the chain 18 through two chain link pins 247.

[0007] Its features are as follows: the roller assembly 23 consists of four pairs of eight rollers 231, which are respectively installed in pairs on four roller sub-shafts 230 located at the four corners of the roller main frame 232. Roller bearings 233 are provided between the roller sub-shafts 230 and the rollers 231, and are locked by locking nuts 235. The roller main frame 232 has a main frame bushing 238 in the middle and is equipped with a main frame bearing 237. The main frame shaft hole 236 is open and is used to install the roller main shaft 242 of the chain clamp 24. The roller sub-shafts 230 are fixed in the preset mounting holes by two roller sub-frames 234 with bolts.

[0008] Its features are: the roller 231 has an annular outer edge 239 that protrudes beyond the annular surface at one edge; when each set of rollers 231 is installed on the roller sub-shaft 230, the outer edge 239 of the roller is kept at the outer end of the roller sub-shaft 230, and the distance between the inner sides of the two outer edges 239 of the rollers is equal to the cross-sectional width of the upper slide rail 263 and the lower slide rail 262 of the slide groove 25, thereby realizing the dynamic engagement between the roller assembly 23 and the slide groove 25.

[0009] The chain clamp 24 mainly consists of a U-shaped chain clamp 245 and a cylindrical roller spindle 242. The outer end of the roller spindle 242 is provided with a retaining spring groove 241, which is used to install a retaining spring after the roller assembly 23 is assembled, preventing the roller assembly 23 from disengaging and limiting its position. The inner end of the roller spindle 242 is vertically welded to one side of the chain clamp 245. The chain clamp 245 is provided with a set of two chain link pin holes 243 on each side. The chain clamp 245 is provided with a chain groove 244 for placing the chain 18 in the middle. Two chain link pins 247 assemble one link of the chain 18 into the chain groove 244, and then the baffle plate 248 and the pin 249 are fixed by the baffle plate groove 246.

[0010] Its features are: the cylinder 167 of the upper sprocket tensioning device 16 is connected into a whole by two sets of parallel fixed frames 17 and a set of inclined beams 172, and then four fixed frame upright plates 171 are welded from the ends of the fixed frames 17 to the upper part of the middle of the tower 14.

[0011] Compared with existing technologies, the advantages of this invention are: it enables timely and appropriate tensioning of worn, loosened, and lengthened chains without stopping the machine, ensuring that chain tension does not affect the long-term stable operation of the pumping unit. It also includes: 1. The gear drives the chain clamp, which in turn moves the lower part of the counterweight in a straight line up and down, ensuring stability and reliability; 2. Counterweights and other components do not require sealed installation, making it easier to disassemble and maintain the counterweights. Attached Figure Description

[0012] Figure 1 This is a perspective view of the present invention; Figure 2 for Figure 1 A simplified, scaled-down, partially disassembled diagram of another embodiment based on the same principle; Figure 3 A 3D view showing the assembly positions of counterweight 22, roller assembly 23, chain clamp 24, etc. Figure 4 for Figure 3 A three-dimensional view of the partial assembly positions of roller assembly 23, chain clamp 24, slide 25, etc. Figure 5 A partial disassembled 3D view of roller assembly 23; Figure 6 A 3D view showing the assembly positions of piston rod 165, sprocket shaft 161, etc. Figure 7 for Figure 6 A schematic diagram after installing sprocket 15; Figure 8 for Figure 7 A schematic diagram after installing hydraulic cylinder 167 and cylinder base 166; Figure 9 for Figure 83D view of the installation chain 18, fixing frame 17, etc.; Figure 10 Disassembly diagram of the main parts of chain clamp 24; Figure 11 for Figure 2 Diagram showing the positional relationship between the middle chain clamp 24, the slide groove assembly 26, the upper sprocket 15, and the lower sprocket 30; Figure 12 A schematic diagram of the chute assembly 26 and the counterweight 22 pulling upwards; Figure 13 A schematic diagram showing the chain 18 pulling the slide groove assembly 26 and the counterweight 22 to the high point where they are about to change direction; Figure 14 A schematic diagram showing the chain 18 pulling the slide assembly 26 and the counterweight 22 passing through the high point to complete the downward movement;

[0013] The figures above are not proportionally related; they are intended to illustrate the working principle and the positional relationships of the parts. In the figures: 10. Roller shaft, 11. Roller, 12. Belt, 13. Platform, 14. Tower, 15. Upper sprocket, 151. Sprocket shaft hole, 152. Sprocket bearing, 16. Upper sprocket tensioning device, 161. Sprocket shaft, 162. Sprocket shaft bracket, 163. Cylinder head, 164. Cylinder head bolt, 165. Piston rod, 166. Cylinder seat, 167. Hydraulic cylinder, 17. Fixed frame, 171. Fixed frame upright plate, 172. Fixed frame inclined beam, 18. Chain, 19. Support rod seat, 20. Support rod, 21. Connector, 22. Counterweight, 23. Roller assembly, 230. 231. Roller subshaft, 232. Roller main frame, 233. Roller bearing, 234. Roller subframe, 235. Locking nut, 236. Main frame shaft hole, 237. Main frame bearing, 238. Main frame bushing, 239. Roller outer edge, 24. Chain clip, 241. Snap ring groove, 242. Roller main shaft, 243. Chain link pin hole, 244. Chain groove, 245. Chain clip, 246. Baffle groove, 247. Chain link pin, 248. Baffle, 249. Pin, 25. Slide groove, 26. Slide rail assembly, 261. Slide groove column, 262. Lower slide rail, 263. Upper slide rail, 27. Reducer, 28. Motor, 29. Well platform, 30. Lower sprocket.

[0014] Regarding the part numbers and descriptions above: The part numbers are not ordered in natural number order; in the attached diagram, most parts are existing products, such as: platform 10 to upper sprocket 15, chain 18 to counterweight 22, reducer 27 to lower sprocket 30, etc. Others are newly designed and manufactured, improved structures, or components.

[0015] like Figure 1As shown: Platform 10 to chain 18 (excluding belt 12), counterweight 22 to lower sprocket 30, etc., mentioned above are all single parts. Others are in pairs or fours. Because their functions are exactly the same but their positions are different, some are in symmetrical positions on the left and right / front and back. For clarity, only the numbers of the left / front side are given, while the numbers of the right / rear side or other positions are omitted. The same applies to other illustrations, such as: Figure 5 Roller assembly 23 Figure 10 This is especially evident in the middle. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should be understood to fall within the scope of protection of the present invention.

[0017] As in Example 1 Figure 1 As shown, inside the 14-meter-high steel tower 14, the hydraulic cylinder 167 of the upper sprocket tensioning device 16 is connected as a whole by two sets of parallel fixing frames 17 and a set of inclined beams 172. Then, four fixing frame uprights 171 are welded from the ends of the fixing frames 17 to the upper part of the middle of the tower 14. The annular chain 18 passes around the upper sprocket 15 and the lower sprocket 30 installed on the upper sprocket tensioning device 16 to form a closed loop, as shown. Figure 1 , Figure 2 and Figure 11 The power transmission process is as follows: the power of the motor 28 is transmitted through the reducer 27 and the lower sprocket 30 to the chain 18 between the upper sprocket 15. A chain clamp 24 connects the chain 18 with the roller assembly 23 and the slide rail assembly 26, thereby enabling the roller assembly 23 to pull the slide rail assembly 26 and the counterweight 22 to move up and down reciprocally. The counterweight 22 passes through the connector 21 and the belt 12 across the roller 11 to pull the sucker rod below and the oil pump in the well. Simply put, because the weights at both ends of the belt 12 are nearly balanced, a small pulling force can drive the counterweight 22 to move up and down.

[0018] Chain clamp 24 Figure 10As shown, it mainly consists of a U-shaped chain clip 245 and a cylindrical roller spindle 242. The outer end of the roller spindle 242 is provided with a retaining spring groove 241, which is used to install a retaining spring after the roller assembly 23 is assembled, preventing the roller assembly 23 from disengaging and limiting its position. The inner end of the roller spindle 242 is vertically welded to one side of the chain clip 245. There are two sets of four chain link pin holes 243 on both sides of the chain clip 245. The middle of the chain clip 245 is provided with a chain groove 244 for placing the chain 18. Two chain link pins 247 assemble one link of the chain 18 into the chain groove 244, and then the baffle plate 248 and the pin 249 are fixed by the baffle plate groove 246.

[0019] Combination Figure 3 , Figure 4 , Figure 5 Let me introduce the main component, roller assembly 23. Roller assembly 23 consists of four pairs of eight rollers 231, which are installed in pairs on four roller sub-shafts 230 located at the four corners of the roller main frame 232. Roller bearings 233 are provided between the roller sub-shafts 230 and the rollers 231, and are locked by lock nuts 235. The roller main frame 232 has a main frame bushing 238 in the middle and is equipped with a main frame bearing 237. The main frame shaft hole 236 is open and is used to install the roller main shaft 242 of the chain clamp 24. The roller sub-shafts 230 are fixed in the preset mounting holes by two roller sub-frames 234 with bolts. Roller 231 has an annular outer edge 239 protruding beyond its annular surface at one edge. When each set of rollers 231 is installed on roller sub-shaft 230, the outer edge 239 of the roller is kept at the outer end of roller sub-shaft 230, and the distance between the inner sides of the two outer edges 239 of the rollers is equal to the cross-sectional width of the upper slide rail 263 and the lower slide rail 262 of the slide groove 25, thereby realizing the dynamic engagement between roller assembly 23 and slide groove 25. The pulling force for the roller assembly 23 moving up and down and the power for rolling left and right come from the roller main shaft 242 installed in the main frame shaft hole 236. That is, the roller main shaft 242 is installed in the main frame shaft hole 236 in the middle of the roller main frame 232. The chain clamp 24 is assembled onto the chain 18 through two chain link pins 247. See Figure 10 , Figure 3 .

[0020] After focusing on the mechanical structure above, the working principle will be explained below with reference to the embodiments. In Embodiment 1, the motor is a commercially available TYK-200L2-22-10-B3 model with a power of 380V and 30 kW. The matching reducer is a K127-225B model. The stroke of the sucker rod installed on the oil well is 8 meters. One working cycle of the sucker rod is 15 seconds, that is, the sucker rod is raised / lowered four times per minute. The oil obtained is sent to the external pipeline network through the wellhead valve.

[0021] Working principle as follows Figure 1As shown, an upper sprocket tensioning device 16 is installed inside the tower 14. The upper sprocket 15 is horizontally mounted on the cylinder cover 163 at the top of the piston rod 165 of the hydraulic cylinder 167 by the sprocket shaft 161. The chain clamp 24 on the chain 18 pulls the roller assembly 23 in the slide groove 25 on one side of the bottom of the counterweight 22. While the chain clamp 24 rotates around the upper sprocket 15 and the lower sprocket 30 for one revolution, it drives the counterweight 22 to move up and down once inside the tower 14. The roller assembly 23 on the chain clamp 24 also moves back and forth once inside the slide groove 25. The upper sprocket tensioning device 16 includes a hydraulic cylinder 167 and a cylinder seat 166 mounted on a fixed frame 17. A pair of sprocket shaft brackets 162 are welded to the cylinder head 163. The cylinder head 163 is fixed to the upper end of the piston rod 165 by a set of cylinder head bolts 164. The sprocket shaft 161 is installed in the sprocket shaft bracket 162. An upper sprocket 15 is installed at one end of the sprocket shaft 161. When the piston rod 165 moves upward, it will push the upper sprocket 15 to move upward synchronously and tension the chain 18. The mechanical reversing device also includes a slide groove 25 structure mounted at the bottom of the counterweight 22, which is surrounded by an upper slide rail 263, a lower slide rail 262, and two slide groove columns 261, and a chain clamp 24 mounted on the roller assembly 23 in the slide groove 25.

[0022] For ease of description, a simplified version of Example 2 is used here. A work cycle is roughly divided into four stages: In the first stage, when the counterweight 22 moves upwards, as... Figure 11 , 12 As shown, the chain clamp 24 and slide rail assembly 26 "push" the slide rail assembly 26 upward in a straight line, causing the counterweight 22 to move upward; in the second stage, the chain clamp 24 moves in an arc along the upper semicircle of the upper sprocket 15 in the slide groove 25, while the roller spindle 242 and roller assembly 23 move from one end to the other in an arc within the slide groove 25, as shown. Figure 13 As shown, they, along with the counterweight 22, transition from an ascending to a descending state; in the third stage, the chain catcher 24 and roller assembly 23 "pull" the slide rail assembly 26 downwards in a straight line, causing the counterweight 22 to move downwards and approach the lower sprocket 30. Figure 14 As shown; in the fourth stage, the chain clamp 24 and the slide rail assembly 26 also make a half-circular arc motion along the lower sprocket 30. The roller main shaft 242, roller assembly 23, etc., slide from the right end back to the left end in the slide groove 25. They themselves and the counterweight 22 change from a descending state to an ascending state. This is one motion cycle. The circular motion of the motor 28 through the reducer 27 is converted into a vertical linear reciprocating motion, which completes the oil extraction work action of the sucker rod pulled by the counterweight 22.

[0023] It should be noted that although the pumping unit is equipped with an upper sprocket tensioning device 16, it does not require frequent operation. Only when the chain 18 is found to be worn, loose, or long should the cylinder 167 be operated to lift the piston rod 165 and raise the upper sprocket 15.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. Unless specifically stated otherwise, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. Any specific values ​​in the examples shown and discussed herein should be interpreted as merely exemplary and not as limiting. Therefore, other examples of exemplary embodiments may have different values.

[0025] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself, such as the description of the upper sprocket 15 and the lower sprocket 30.

[0026] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., may be used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly. (e.g., descriptions of other devices or features.)

[0027] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0028] In addition to the new technologies involved in this invention, some existing technologies will also be used, which will not be described in detail here. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanically reversing tower pumping unit with a tensioning device, comprising a drive unit mounted on a well platform (29) below the tower (14) and a power transmission unit, characterized in that: An upper sprocket tensioning device (16) is installed inside the tower (14). The upper sprocket (15) is horizontally mounted on the cylinder head (163) at the top of the piston rod (165) of the hydraulic cylinder (167) by the sprocket shaft (161). The chain clamp (24) on the chain (18) pulls the roller assembly (23) in the slide groove (25) on one side of the bottom of the counterweight (22). While the chain clamp (24) rotates around the upper sprocket (15) and the lower sprocket (30) once, it drives the counterweight (22) to move up and down once inside the tower (14). The roller assembly (23) on the chain clamp (24) also moves back and forth once inside the slide groove (25). Among them: The upper sprocket tensioning device (16) includes a cylinder (167) and a cylinder seat (166) mounted on a fixed frame (17), a pair of sprocket shaft brackets (162) welded to the cylinder head (163), the cylinder head (163) being fixed to the upper end of the piston rod (165) by a set of cylinder head bolts (164), the sprocket shaft (161) being mounted in the sprocket shaft bracket (162), and an upper sprocket (15) being mounted at one end of the sprocket shaft (161). When the piston rod (165) moves upward, it will push the upper sprocket (15) to move upward synchronously and tension the chain (18). The mechanical reversing device also includes a slide groove (25) structure consisting of an upper slide rail (263), a lower slide rail (262), and two slide groove columns (261) installed at the bottom of the counterweight (22), and a chain clamp (24) installed on the roller assembly (23) in the slide groove (25); the roller spindle (242) of the chain clamp (24) is installed in the main frame shaft hole (236) in the middle of the roller main frame (232), and the chain clamp (24) is assembled on the chain (18) through two chain link pins (247).

2. The mechanically reversing tower pumping unit with tensioning device according to claim 1, characterized in that: The roller assembly (23) consists of four pairs of eight rollers (231), which are installed in pairs on four roller sub-shafts (230) located at the four corners of the roller main frame (232). Roller bearings (233) are provided between the roller sub-shafts (230) and the rollers (231), and are locked by locking nuts (235). The roller main frame (232) has a main frame bushing (238) in the middle and is equipped with a main frame bearing (237). The main frame shaft hole (236) is open and is used to install the roller main shaft (242) of the chain clamp (24). The roller sub-shafts (230) are fixed in the preset mounting holes by two roller sub-frames (234) with bolts.

3. The mechanically reversing tower pumping unit with tensioning device according to claim 2, characterized in that: The roller (231) has an annular outer edge (239) that protrudes beyond the annular surface. When each set of rollers (231) is installed on the roller subshaft (230), the outer edge (239) of the roller is kept at the outer end of the roller subshaft (230), and the distance between the inner sides of the two outer edges (239) of the rollers is equal to the cross-sectional width of the upper slide rail (263) and the lower slide rail (262) of the slide groove (25), thereby realizing the dynamic fit between the roller assembly (23) and the slide groove 25.

4. The mechanically reversing tower pumping unit with tensioning device according to claim 1, characterized in that: The chain clamp (24) is mainly composed of a U-shaped chain clamp (245) and a cylindrical roller spindle (242). The outer end of the roller spindle (242) is provided with a retaining spring groove (241) for installing a retaining spring after assembling the roller assembly (23) to prevent the roller assembly (23) from disengaging and to limit its position. The inner end of the roller spindle (242) is vertically welded to one side of the chain clamp (245). The chain clamp (245) is provided with a set of two chain link pin holes (243) on each side. The chain clamp (245) is provided with a chain groove (244) in the middle for placing the chain (18). Two chain link pins (247) assemble one link of the chain (18) into the chain groove (244), and then the baffle (248) and pin (249) are fixed by the baffle groove (246).

5. The mechanically reversing tower pumping unit with tensioning device according to claim 1, characterized in that: The cylinder (167) of the upper sprocket tensioning device (16) is connected as one unit by two sets of parallel fixed frames (17) and a set of inclined beams (172), and then four fixed frame uprights (171) are welded from the end of the fixed frame (17) to the upper part of the middle of the tower (14).

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