Polish rod buffering lowering device and method

Abstract

The invention relates to the technical field of ground tools, in particular to a polish rod buffer lowering device and method.The polish rod buffer lowering device comprises a U-shaped clamp, a connecting neck, a connecting sleeve and a fixing base, the U-shaped clamp comprises a U-shaped clamp body, a mounting block, an ejector rod, an ejecting block and an adjusting nut, the U-shaped clamp body is provided with a clamping cavity with a rightward opening, and the mounting block is mounted on the inner side of the right portion of the U-shaped clamp body in a limiting mode; the method comprises the following steps that (1) the connecting sleeve and the fixed base are connected and installed together through threads; the device is reasonable and compact in structure and ingenious in conception, and by arranging the connecting sleeve, the U-shaped clamp and the polish rod can be slowly put down when the connecting sleeve rotates; the ejector rod moves leftwards by screwing the adjusting nut, so that the polish rod is clamped under the combined action of the inner side of the left end of the clamping cavity and the inner side of the jacking block; by unscrewing the adjusting nut, the ejector rod moves rightwards, so that clamping of the outer wall of the polish rod is quickly relieved, and the device has the advantages of being quick, stable and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of well tools, and relates to a polished rod buffering lowering device and method. Background Art

[0002] In heavy oil production, an integrated injection and production pump is used. When injecting steam, the pump needs to be lowered about 1m to the bottom of the pump. Steam injection can be carried out after the steam injection channel of the pump is opened. During the lowering process, the operator needs to disassemble and assemble the rod clamp at the wellhead and start and stop the pumping unit to unload the pumping unit. The operation is cumbersome. At the same time, during the disassembly and assembly of the rod clamp and unloading process, the operator's hands are easily clamped in the lower part of the rod clamp, causing injury. Summary of the invention

[0003] The present invention provides a polished rod buffer lowering device and method, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing polished rod clips need to be frequently disassembled and assembled.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a polished rod buffering lowering device comprises a U-shaped fixture, a connecting neck, a connecting sleeve and a fixed base, the U-shaped fixture comprises a U-shaped fixture body, a mounting block, a push rod, a tightening block and an adjusting nut, the U-shaped fixture body is provided with a clamping cavity opening to the right, a mounting block is installed at a limit position on the right inner side of the U-shaped fixture body, left and right through mounting holes are provided in the middle of the mounting block, a push rod is provided in the mounting hole, a tightening block located on the left side of the mounting block is fixedly installed at the left end of the push rod, the tightening block is an arc plate opening to the left, and an adjusting nut located on the right side of the mounting block is fixedly installed on the right side of the push rod through a thread. Joint nut; a connecting sleeve is provided below the U-shaped card body, a first inner ring groove is provided on the inner side of the upper end of the connecting sleeve, a second inner ring groove is provided on the inner side of the lower end of the connecting sleeve, a first loading long groove is provided on the right side of the connecting sleeve, which runs through the upper and lower sides and can be connected with the inner part thereof, a connecting neck is provided in the first inner ring groove, and a second loading long groove is provided on the right side of the connecting neck, which runs through the upper and lower sides and can be connected with the inner part thereof, a fixed base is fixedly installed in the second inner ring groove through a threaded connection with the lower end located below the connecting sleeve, and a third loading long groove is provided on the right side of the fixed base, which runs through the upper and lower sides and can be connected with the inner part thereof.

[0005] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above may also include balls and pressure covers. The first inner ring groove is provided with a plurality of hemispherical grooves opening upward, each hemispherical groove is provided with a ball, a pressure cover is fixedly installed in the first inner ring groove, and a limiting hole is provided on the pressure cover corresponding to each ball position, and the lower side of the connecting neck is in contact with the ball.

[0006] The above-mentioned may also include a front limit wing plate and a rear limit wing plate. A front limit groove is provided on the inner side of the front part of the U-shaped card body corresponding to the mounting block position. The front limit groove is in the shape of an L that opens upward and can be connected to the clamping cavity. The front limit groove includes a front transverse groove and a front vertical groove. The right end of the front transverse groove is connected to the front end of the front vertical groove. A rear limit groove is provided on the inner side of the rear part of the U-shaped card body corresponding to the mounting block position. The rear limit groove is in the shape of an L that opens upward and can be connected to the clamping cavity. The rear limit groove includes a rear transverse groove and a rear vertical groove. The right end of the rear transverse groove is connected to the rear end of the rear vertical groove. A front limit wing plate located in the front limit groove is fixedly installed on the front side of the mounting block, and a rear limit wing plate located in the rear limit groove is fixedly installed on the rear side of the mounting block.

[0007] The above-mentioned may also include a support seat, a support seat is fixedly installed on the right side of the mounting block corresponding to the lower left side position of the adjusting nut, and the lower left side of the adjusting nut is seated in the support seat; the adjusting nut includes a first circular ring portion, a second circular ring portion and a hexagonal portion arranged in sequence from left to right, the outer diameter of the first circular ring portion is larger than the outer diameter of the second circular ring portion, the support seat is in a semicircular ring shape with an opening upward, a first arc groove matching the first circular ring portion is provided on the inner side of the left end of the support seat, and a second arc groove matching the second circular ring portion is provided on the inner side of the right end of the support seat.

[0008] The above may also include a clamping block. The left end of the clamping cavity is provided with a clamping block, and the clamping block is a semicircular arc plate with an opening facing right.

[0009] The outer side of the tightening block and the outer side of the clamping block may be coated with a fluororubber layer.

[0010] The above-mentioned tightening block and clamping block may both include a steel plate, an adhesive heat-insulating layer and a friction block which are sequentially arranged from the outside to the inside.

[0011] The above may also include a safety lock pin. An upper socket that passes through the upper and lower parts is provided on the upper left part of the U-shaped card body. A lower socket that opens upward is provided on the connecting sleeve corresponding to the position of the upper socket. A safety lock pin with its lower end located in the lower socket is provided in the upper socket.

[0012] The above may also include an operating rod, and the operating rod is fixedly installed at the middle part of the front side and the middle part of the rear side of the connecting sleeve.

[0013] The second technical solution of the present invention is achieved by the following measures: a method of using the above-mentioned polished rod buffer lowering device comprises the following steps: (1) Install the connecting sleeve and the fixed base together through threaded connection so that the first loading slot and the third loading slot are both located at the same position on the right side; (2) Install the connecting sleeve and the fixed base together on the outer side of the polished rod located above the polished rod packing box through the first and third long slots, and fix the lower side of the fixed base and the upper side of the polished rod packing box together; (3) Install the U-shaped card body on the outside of the polished rod located above the connecting sleeve through the clamping cavity, and seat the connecting neck in the first inner ring groove; (4) Install the push rod into the mounting hole on the mounting block, with the arc-shaped opening of the tightening block facing left, and install the adjusting nut on the right side of the push rod; (5) Install the mounting block on the right inner side of the U-shaped card body from above the U-shaped card body, tighten the adjusting nut to move the push rod to the left, so that the corresponding position on the outer side of the light rod is clamped under the joint action of the inner side of the left end of the clamping cavity and the inner side of the clamping block; (6) When a bare rod is needed, the U-shaped fixture and the bare rod are slowly lowered by rotating the connecting sleeve.

[0014] The present invention has a reasonable and compact structure and an ingenious design. By arranging a connecting sleeve, the U-shaped clamp and the light rod can be slowly lowered when the connecting sleeve rotates; by tightening the adjusting nut, the push rod is moved to the left, so that the light rod is clamped under the joint action of the inner side of the left end of the clamping cavity and the inner side of the clamping block; by loosening the adjusting nut, the push rod is moved to the right, so that the clamping of the outer wall of the light rod is quickly released, and the present invention has the characteristics of being fast, stable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the main structure of embodiments 1 to 10.

[0016] Attached Figure 2 For attachment Figure 1 Schematic diagram of the three-dimensional structure.

[0017] Attached Figure 3 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the middle U-shaped fixture.

[0018] Attached Figure 4 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the middle U-shaped card body.

[0019] Attached Figure 5 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the mounting block and the support base.

[0020] Attached Figure 6 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the middle push rod and the tightening block.

[0021] Attached Figure 7 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the connecting sleeve.

[0022] Attached Figure 8 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the fixed base.

[0023] The codes in the accompanying drawings are: 1 is a U-shaped card body, 2 is a clamping cavity, 3 is a mounting block, 4 is a push rod, 5 is a top tightening block, 6 is an adjusting nut, 7 is a support seat, 8 is a front limit wing plate, 9 is a rear limit wing plate, 10 is a front transverse groove, 11 is a front vertical groove, 12 is a rear transverse groove, 13 is a rear vertical groove, 14 is a first arc groove, 15 is a second arc groove, 16 is a clamping block, 17 is a connecting neck, 18 is a first inner ring groove, 19 is a second inner ring groove, 20 is a ball, 21 is a pressure cover, 22 is a safety lock pin, 23 is an operating rod, 24 is an upper jack, 25 is a lower jack, 26 is a first loading long groove, 27 is a second loading long groove, 28 is a third loading long groove, 29 is a light rod, 30 is a packing box, 31 is a connecting sleeve, and 32 is a fixed base. DETAILED DESCRIPTION

[0024] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0025] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0026] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figures 1 to 8As shown, the light rod buffer lowering device includes a U-shaped fixture, a connecting neck 17, a connecting sleeve 31 and a fixed base 32. The U-shaped fixture includes a U-shaped fixture body 1, a mounting block 3, a push rod 4, a tightening block 5 and an adjusting nut 6. The U-shaped fixture body 1 is provided with a clamping cavity 2 opening to the right, a mounting block 3 is installed on the right inner side of the U-shaped fixture body 1, and a left and right through mounting holes are provided in the middle of the mounting block 3. A push rod 4 is provided in the mounting hole, and a tightening block 5 located on the left side of the mounting block 3 is fixedly installed on the left end of the push rod 4. The tightening block 5 is an arc-shaped plate opening to the left, and an adjusting nut 6 located on the right side of the mounting block 3 is fixedly installed on the right side of the push rod 4 through a thread; a connecting rod 1 is provided at the bottom of the U-shaped fixture body 1 The sleeve 31 has a first inner ring groove 18 on the inner side of the upper end of the connecting sleeve 31, a second inner ring groove 19 on the inner side of the lower end of the connecting sleeve 31, a first loading long groove 26 that runs through the upper and lower sides and can be connected with the inner part thereof is provided on the right side of the connecting sleeve 31, a connecting neck 17 that is fixedly installed with the lower side of the U-shaped card body 1 on the upper side is provided in the first inner ring groove 18, a second loading long groove 27 that runs through the upper and lower sides and can be connected with the inner part thereof is provided on the right side of the connecting neck 17, a fixed base 32 whose lower end is located below the connecting sleeve 31 is fixedly installed in the second inner ring groove 19 through a threaded connection, and a third loading long groove 28 that runs through the upper and lower sides and can be connected with the inner part thereof is provided on the right side of the fixed base 32. During use, by setting the connecting sleeve 31, the U-shaped clamp and the light rod 29 can be slowly lowered when it rotates, thereby effectively controlling and reducing the speed at which the light rod 29 is lowered by its own weight, thereby playing a buffering role; by tightening the adjusting nut 6, the push rod 4 moves to the left, so that the light rod 29 is clamped under the joint action of the inner side of the left end of the clamping cavity 2 and the inner side of the clamping block 5; by loosening the adjusting nut 6, the push rod 4 moves to the right, thereby quickly releasing the clamping of the outer wall of the light rod 29.

[0027] The specific implementation process of this embodiment can be as follows: first, the connecting sleeve 31 and the fixed base 32 are installed together through threaded connection, so that the first loading slot 26 and the third loading slot 28 are both located at the same position on the right; then, the installed connecting sleeve 31 and the fixed base 32 are installed on the outer side of the light rod 29 located above the light rod packing box 30 through the first loading slot 26 and the third loading slot 28, and the lower side of the fixed base 32 is limited and fixed to the upper side of the packing box 30 of the light rod 29; then, the U-shaped card body 1 is installed at the position above the connecting sleeve 31 through the clamping cavity 2 The outer side of the polished rod 29 is installed, and the connecting neck 17 is seated in the first inner ring groove 18; the push rod 4 is then installed into the mounting hole set on the mounting block 3, so that the arc-shaped opening of the tightening block 5 is facing left, and the adjusting nut 6 is installed on the right side of the push rod 4; finally, the mounting block 3 is limitedly installed on the inner side of the right part of the U-shaped card body 1 from above the U-shaped card body 1, and the adjusting nut 6 is tightened to move the push rod 4 to the left, so that the corresponding position of the outer side of the polished rod 29 is clamped under the joint action of the inner side of the left end of the clamping cavity 2 and the inner side of the tightening block 5; when the lower polished rod 29 is needed, the U-shaped fixture and the polished rod 29 are slowly lowered by rotating the connecting sleeve 31. According to requirements, the installation method of the fixed base 32 and the bare rod packing box 30 can be that a plurality of protrusions are set on the lower side of the fixed base 32, and a groove is provided on the upper side of the bare rod packing box 30 corresponding to each protrusion position, and each protrusion is located in the groove at the corresponding position, thereby preventing the fixed base 32 from rotating with the connecting sleeve 31; in addition, the installation method of the fixed base 32 and the bare rod packing box 30 can also be an existing well-known detachable fixed installation method, such as flange connection.

[0028] The above-mentioned polished rod buffer lowering device can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 2 , 7 As shown, it also includes a ball 20 and a gland 21. A plurality of hemispherical grooves with openings upward are provided in the first inner ring groove 18, and a ball 20 is provided in each hemispherical groove. A gland 21 is fixedly installed in the first inner ring groove 18, and a limiting hole is provided on the gland 21 corresponding to the position of each ball 20, and the lower side of the connecting neck 17 contacts the ball 20. During use, by providing a plurality of balls 20, the friction between the connecting sleeve 31 and the lower end of the connecting neck 17 can be reduced when the connecting sleeve 31 is rotated, thereby facilitating the rotation of the connecting sleeve 31.

[0029] Embodiment 3: As attached Figures 2 to 5As shown, it also includes a front limit wing plate 8 and a rear limit wing plate 9. A front limit groove is provided on the inner side of the front part of the U-shaped card body 1 corresponding to the position of the mounting block 3. The front limit groove is in an L-shape with an opening upward and can be connected with the clamping cavity 2. The front limit groove includes a front transverse groove 10 and a front vertical groove 11. The right end of the front transverse groove 10 is connected with the front end of the front vertical groove 11. A rear limit groove is provided on the inner side of the rear part of the U-shaped card body 1 corresponding to the position of the mounting block 3. The rear limit groove is in an L-shape with an opening upward and can be connected with the clamping cavity 2. The rear limit groove includes a rear transverse groove 12 and a rear vertical groove 13. The right end of the rear transverse groove 12 is connected with the rear end of the rear vertical groove 13; a front limit wing plate 8 located in the front limit groove is fixedly installed on the front side of the mounting block 3, and a rear limit wing plate 9 located in the rear limit groove is fixedly installed on the rear side of the mounting block 3. During use, by providing the front limiting wing plate 8 and the rear limiting wing plate 9 of the L-shaped structure, it is convenient to limit the installation block 3 to the inner side of the right part of the U-shaped card body 1; by providing the front limiting groove and the rear limiting groove opening upward, it is prevented that the installation block 3 falls from the lower side of the U-shaped card body 1. According to the needs, the front limiting wing plate 8 and the rear limiting wing plate 9 are both integrally provided with the installation block 3.

[0030] Embodiment 4: As attached Figure 2 , 3 5, it also includes a support seat 7, the support seat 7 is fixedly installed on the right side of the mounting block 3 corresponding to the lower left side of the adjusting nut 6, and the lower left side of the adjusting nut 6 is seated in the support seat 7; the adjusting nut 6 includes a first annular portion, a second annular portion and a hexagonal portion arranged in sequence from left to right, the outer diameter of the first annular portion is greater than the outer diameter of the second annular portion, the support seat 7 is in a semicircular shape with an opening upward, and a first arc groove 14 matching the first annular portion is provided on the inner side of the left end of the support seat 7, and a second arc groove 15 matching the second annular portion is provided on the inner side of the right end of the support seat 7. During use, through such an arrangement, the adjusting nut 6 is supported while the rotation of the adjusting nut 6 is not affected.

[0031] Embodiment 5: As attached Figure 3 As shown, a clamping block 16 is also included, and a clamping block 16 is provided at the left end of the clamping cavity 2. The clamping block 16 is a semicircular plate with an opening to the right. During use, by providing the semicircular clamping block 16, the contact area with the outer wall of the polished rod 29 is increased, thereby improving the overall stability.

[0032] Embodiment 6: As attached Figures 1 to 6 As shown, a fluororubber layer is coated on the outer side of the pressing block 5 and the outer side of the clamping block 16. In the process of use, through such an arrangement, the friction between the polished rod 29 and the pressing block 5 and the clamping block 16 is increased, thereby improving the overall stability.

[0033] Embodiment 7: As attached Figures 1 to 6As shown, the top block 5 and the clamping block 16 both include a steel plate, an adhesive heat insulation layer and a friction block arranged in sequence from the outside to the inside. During use, through such an arrangement, the friction between the polished rod 29 and the top block 5 and the clamping block 16 is increased, thereby improving the overall stability. According to the needs, the top block 5 and the clamping block 16 are existing known brake pad structures, and the friction block thereof can be a resin-based brake material, a powder metallurgy brake material, a carbon / carbon composite brake material, a ceramic-based brake material, etc.

[0034] Embodiment 8: As attached Figures 1 to 8 As shown, it also includes a safety lock pin 22. An upper insertion hole 24 is provided on the upper left part of the U-shaped card body 1, which is through from top to bottom. A lower insertion hole 25 with an opening upward is provided on the connecting sleeve 31 corresponding to the position of the upper insertion hole 24. A safety lock pin 22 with a lower end located in the lower insertion hole 25 is provided in the upper insertion hole 24. During use, by providing the safety lock pin 22, after the safety lock pin 22 is inserted, the U-shaped fixture and the polished rod 29 can be prevented from rotating relative to the connecting sleeve 31.

[0035] Embodiment 9: As attached Figure 1 , 2 7, it also includes an operating rod 23, and the middle part of the front side and the middle part of the rear side of the connecting sleeve 31 are fixedly installed with the operating rod 23. During use, the connecting sleeve 31 is conveniently rotated by setting the operating rod 23.

[0036] Embodiment 10: As attached Figures 1 to 4 As shown, a method for using the above-mentioned polished rod buffer lowering device includes the following steps: (1) The connecting sleeve 31 and the fixed base 32 are installed together by threaded connection, so that the first long slot 26 and the third long slot 28 are both located at the same position on the right side; (2) The connecting sleeve 31 and the fixed base 32 are installed together on the outer side of the polished rod 29 located above the packing box 30 through the first long slot 26 and the third long slot 28, and the lower side of the fixed base 32 is fixedly installed with the upper side of the packing box 30 of the polished rod 29; (3) The U-shaped card body 1 is installed on the outer side of the polished rod 29 located above the connecting sleeve 31 through the clamping cavity 2, and the connecting neck 17 is seated in the first inner ring groove 18; (4) Install the push rod 4 into the mounting hole provided on the mounting block 3, so that the arc-shaped opening of the tightening block 5 faces left, and install the adjusting nut 6 on the right part of the push rod 4; (5) Install the mounting block 3 on the right inner side of the U-shaped card body 1 from above the U-shaped card body 1, tighten the adjusting nut 6, and move the push rod 4 to the left, so that the corresponding position on the outer side of the light rod 29 is clamped under the joint action of the inner side of the left end of the clamping cavity 2 and the inner side of the clamping block 5; (6) When the lower polished rod 29 is needed, the U-shaped fixture and the polished rod 29 are slowly lowered by rotating the connecting sleeve 31.

[0037] During use, when lowering, the present invention can quickly unload the clip of the upper polished rod 29 of the suspension rope, which is convenient for personnel to unload the clip of the upper polished rod 29; at the same time, by rotating the connecting sleeve 31, the speed at which the polished rod 29 is lowered by its own weight is delayed and controlled, effectively ensuring that the downhole pipe string is slowly lowered to the bottom of the pump, and during operation, there is no need to frequently disassemble and assemble the polished rod 29 clip and start and stop the pumping unit to load or unload, which simplifies the lowering operation of the pump, reduces labor intensity, improves labor efficiency, and reduces personal injury during operation.

[0038] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A polished rod buffer lowering device, characterized in that The U-shaped fixture comprises a U-shaped fixture, a connecting neck, a connecting sleeve and a fixed base. The U-shaped fixture comprises a U-shaped fixture body, a mounting block, a push rod, a tightening block and an adjusting nut. The U-shaped fixture body is provided with a clamping cavity opening to the right. A mounting block is installed at a limit position on the inner side of the right part of the U-shaped fixture body. The middle part of the mounting block is provided with left and right through mounting holes. A push rod is provided in the mounting hole. A tightening block located on the left side of the mounting block is fixedly installed at the left end of the push rod. The tightening block is an arc-shaped plate opening to the left. An adjusting nut located on the right side of the mounting block is fixedly installed on the right part of the push rod through a thread. A connecting sleeve is provided under the U-shaped fixture body. A first inner ring groove is provided on the inner side of the upper end of the connecting sleeve, a second inner ring groove is provided on the inner side of the lower end of the connecting sleeve, a first loading long groove is provided on the right side of the connecting sleeve, the first inner ring groove is provided with a connecting neck fixedly installed with the upper side and the lower side of the U-shaped card body, a second loading long groove is provided on the right side of the connecting neck, a fixed base is fixedly installed in the second inner ring groove with the lower end located below the connecting sleeve through a threaded connection, and a third loading long groove is provided on the right side of the fixed base, which is connected to the inner side of the third loading long groove.

2. The polished rod buffer lowering device according to claim 1 is characterized in that It also includes balls and pressure covers. The first inner ring groove is provided with a plurality of hemispherical grooves opening upward, each hemispherical groove is provided with a ball, a pressure cover is fixedly installed in the first inner ring groove, and a limiting hole is provided on the pressure cover corresponding to each ball position, and the lower side of the connecting neck is in contact with the ball.

3. The polished rod buffer lowering device according to claim 1 or 2, characterized in that The front limit groove is L-shaped and can be connected with the clamping cavity. The front limit groove includes a front transverse groove and a front vertical groove. The right end of the front transverse groove is connected with the front end of the front vertical groove. A rear limit groove is provided on the inner side of the rear of the U-shaped card body corresponding to the mounting block position. The rear limit groove is L-shaped and can be connected with the clamping cavity. The rear limit groove includes a rear transverse groove and a rear vertical groove. The right end of the rear transverse groove is connected with the rear end of the rear vertical groove. A front limit groove is fixedly installed on the front side of the mounting block, and a rear limit groove is fixedly installed on the rear side of the mounting block.

4. The polished rod buffer lowering device according to claim 1 or 2, characterized in that It also includes a support seat, which is fixedly installed on the right side of the mounting block corresponding to the lower left side of the adjusting nut, and the lower left side of the adjusting nut is seated in the support seat; the adjusting nut includes a first circular ring portion, a second circular ring portion and a hexagonal portion arranged in sequence from left to right, the outer diameter of the first circular ring portion is larger than the outer diameter of the second circular ring portion, the support seat is in a semicircular ring shape with an opening upward, a first arc groove matching the first circular ring portion is provided on the inner side of the left end of the support seat, and a second arc groove matching the second circular ring portion is provided on the inner side of the right end of the support seat.

5. The polished rod buffer lowering device according to claim 3 is characterized in that It also includes a support seat, which is fixedly installed on the right side of the mounting block corresponding to the lower left side of the adjusting nut, and the lower left side of the adjusting nut is seated in the support seat; the adjusting nut includes a first circular ring portion, a second circular ring portion and a hexagonal portion arranged in sequence from left to right, the outer diameter of the first circular ring portion is larger than the outer diameter of the second circular ring portion, the support seat is in a semicircular ring shape with an opening upward, a first arc groove matching the first circular ring portion is provided on the inner side of the left end of the support seat, and a second arc groove matching the second circular ring portion is provided on the inner side of the right end of the support seat.

6. The polished rod buffer lowering device according to claim 1, 2, 3, 4 or 5, characterized in that It also includes a clamping block. The left end of the clamping cavity is provided with a clamping block, and the clamping block is a semicircular arc plate with an opening facing right.

7. The polished rod buffer lowering device according to claim 6, characterized in that The outer side of the tightening block and the outer side of the clamping block are coated with a fluororubber layer.

8. The polished rod buffer lowering device according to claim 6, characterized in that The tightening block and the clamping block both include a steel plate, a bonding heat insulation layer and a friction block which are sequentially arranged from the outside to the inside.

9. The polished rod buffer lowering device according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that It also includes a safety lock pin, an upper socket extending from top to bottom is provided on the left upper side of the U-shaped card body, a lower socket opening upward is provided on the connecting sleeve corresponding to the position of the upper socket, and a safety lock pin with the lower end located in the lower socket is provided in the upper socket; or / and, it also includes an operating rod, and an operating rod is fixedly installed in the middle of the front side and the middle of the rear side of the connecting sleeve.

10. A method for lowering a polished rod with buffering according to any one of claims 1 to 9, characterized in that The steps include: (1) Install the connecting sleeve and the fixed base together through threaded connection so that the first loading slot and the third loading slot are both located at the same position on the right side; (2) Install the connecting sleeve and the fixed base together on the outer side of the polished rod located above the polished rod packing box through the first and third long slots, and fix the lower side of the fixed base and the upper side of the polished rod packing box together; (3) Install the U-shaped card body on the outside of the polished rod located above the connecting sleeve through the clamping cavity, and seat the connecting neck in the first inner ring groove; (4) Install the push rod into the mounting hole on the mounting block, with the arc-shaped opening of the tightening block facing left, and install the adjusting nut on the right side of the push rod; (5) Install the mounting block on the right inner side of the U-shaped card body from above the U-shaped card body, tighten the adjusting nut to move the push rod to the left, so that the corresponding position on the outer side of the light rod is clamped under the joint action of the inner side of the left end of the clamping cavity and the inner side of the clamping block; (6) When a lower polished rod is needed, the U-shaped fixture and the polished rod are slowly lowered by rotating the connecting sleeve.

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