Polished rod buffer drop down device and method

Abstract

The present application relates to the technical field of well tools, and is a polished rod buffer lowering device and method. The former comprises a U-shaped clamp, a connecting neck, a connecting sleeve and a fixed base. The U-shaped clamp comprises a U-shaped clamp body, a mounting block, a top rod, a clamping block and an adjusting nut. The U-shaped clamp body is provided with a clamping cavity with an opening facing right. The mounting block is installed on the right inner side of the U-shaped clamp body in a limiting manner. The steps of the latter are as follows: (1) the connecting sleeve and the fixed base are connected and installed together through threads. The present application has reasonable and compact structure, and ingenious design. Through the setting of the connecting sleeve, the slow lowering of the U-shaped clamp and the polished rod can be realized when the connecting sleeve rotates. Through the tightening of the adjusting nut, the top rod moves to the left, so that the clamping of the polished rod is realized under the joint action of the left end inner side of the clamping cavity and the inner side of the clamping block. Through the loosening of the adjusting nut, the top rod moves to the right, so that the clamping of the outer wall of the polished rod is quickly released. The present application has the characteristics of rapidness, stability and high efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of well tools, and is a polished rod buffer lowering device and method. BACKGROUND

[0002] In thick oil production, an injection-production integrated pump is used. The pump needs to be lowered by about 1m to the pump bottom when steam injection is performed, and the steam injection channel of the pump is opened to perform steam injection. During the lowering process, the operator needs to repeatedly disassemble and assemble the polished rod clamp at the wellhead and start and stop the pumping unit to perform the horsehead loading and unloading work, which is complicated to operate. Meanwhile, the operator is prone to be injured by the polished rod clamp during the disassembly and assembly of the polished rod clamp and the loading and unloading process. SUMMARY

[0003] The present application provides a polished rod buffer lowering device and method, which overcomes the shortcomings of the prior art and effectively solves the problem of frequent disassembly and assembly of the existing polished rod clamp.

[0004] One of the technical solutions of the present application is implemented by the following measures: a polished rod buffer lowering device, comprising a U-shaped clamp, a connecting neck, a connecting sleeve and a fixed base, the U-shaped clamp comprising a U-shaped clamp body, a mounting block, a jacking rod, a jacking block and an adjusting nut, the U-shaped clamp body being provided with a clamping cavity with an opening to the right, a mounting block being limitingly installed on the inner side of the right part of the U-shaped clamp body, a left-right through mounting hole being provided in the middle part of the mounting block, a jacking rod being provided in the mounting hole, the jacking rod being fixedly installed at the left of the mounting block, the jacking block being an arc-shaped plate with an opening to the left, and the jacking rod being fixedly installed at the right of the mounting block through a thread; the U-shaped clamp body being provided with the connecting sleeve below, the connecting sleeve being provided with a first inner ring groove on the inner side of the upper end, the connecting sleeve being provided with a second inner ring groove on the inner side of the lower end, the connecting sleeve being provided with a first built-in long groove which is vertically through and can be in communication with the inside thereof on the right side, the first inner ring groove being provided with the connecting neck which is fixedly installed together with the lower side of the U-shaped clamp body on the upper side, the connecting neck being provided with a second built-in long groove which is vertically through and can be in communication with the inside thereof on the right side, and the second inner ring groove being provided with the fixed base which is fixedly installed below the connecting sleeve through a thread, the fixed base being provided with a third built-in long groove which is vertically through and can be in communication with the inside thereof on the right side.

[0005] The following is a further optimization or / and improvement of the above-mentioned one of the technical solutions of the present application:

[0006] The above-mentioned can further include a ball and a gland, a plurality of semispherical grooves with openings upward are provided in the first inner ring groove, a ball is provided in each semispherical groove, the first inner ring groove is fixedly installed with a gland, a limiting hole is provided on the gland corresponding to the position of each ball, and the lower side of the connecting neck is in contact with the ball.

[0007] The above may also include a front limiting wing plate and a rear limiting wing plate. A front limiting 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 limiting groove is L-shaped with an upward opening and can communicate with the clamping cavity. The front limiting groove includes a front horizontal groove and a front vertical groove. The right end of the front horizontal groove is connected to the front end of the front vertical groove. A rear limiting 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 limiting groove is L-shaped with an upward opening and can communicate with the clamping cavity. The rear limiting groove includes a rear horizontal groove and a rear vertical groove. The right end of the rear horizontal groove is connected to the rear end of the rear vertical groove. A front limiting wing plate located in the front limiting groove is fixedly installed on the front side of the mounting block, and a rear limiting wing plate located in the rear limiting groove is fixedly installed on the rear side of the mounting block.

[0008] The above may also include a support base, on the right side of the mounting block corresponding to the lower left side of the adjusting nut, with the lower left side of the adjusting nut seated inside the support base; the adjusting nut includes a first ring portion, a second ring portion, and a hexagonal portion arranged sequentially from left to right, the outer diameter of the first ring portion being larger than the outer diameter of the second ring portion, the support base being a semi-circular ring with an upward opening, the inner side of the left end of the support base having a first arc-shaped groove matching the first ring portion, and the inner side of the right end of the support base having a second arc-shaped groove matching the second ring portion.

[0009] The above may also include a clamping block, with a clamping block provided at the left end of the clamping cavity, the clamping block being a semi-circular arc plate with an opening to the right.

[0010] Both the outer side of the aforementioned clamping block and the outer side of the clamping block can be covered with a fluororubber layer.

[0011] Both the aforementioned clamping block and the clamping block may include a steel plate, an adhesive heat insulation layer, and a friction block arranged sequentially from the outside to the inside.

[0012] The above may also include a safety locking pin. The upper left side of the U-shaped card body is provided with an upper insertion hole that runs through the top and bottom. The connecting sleeve corresponding to the position of the upper insertion hole is provided with a lower insertion hole that opens upwards. A safety locking pin with its lower end located in the lower insertion hole is provided in the upper insertion hole.

[0013] The above may also include an operating lever, with the operating lever fixedly installed on both the middle of the front side and the middle of the rear side of the connecting sleeve.

[0014] The second technical solution of the present invention is achieved through the following measures: a method using the above-mentioned optical rod buffer lowering device, comprising the following steps:

[0015] (1) Install the connecting sleeve and the fixed base together by threaded connection, so that the first insertion slot and the third insertion slot are both located at the same position on the right side;

[0016] (2) The connecting sleeve and the fixed base installed together are installed on the outside of the optical rod located above the optical rod packing box through the first insertion long slot and the third insertion long slot, and the lower side of the fixed base is fixedly installed together with the upper side of the optical rod packing box;

[0017] (3) Install the U-shaped card body on the outside of the light rod located above the connecting sleeve through the clamping cavity, and place the connecting neck seat in the first inner ring groove;

[0018] (4) Insert the push rod into the mounting hole provided on the mounting block, so that the arc-shaped opening of the clamping block faces to the left, and install the adjusting nut on the right side of the push rod;

[0019] (5) Install the mounting block from above the U-shaped card body on the inner right side of the U-shaped card body, tighten the adjusting nut, and move the top rod to the left. Thus, the corresponding position on the outer side of the smooth 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 top clamping block.

[0020] (6) When the lower light rod is needed, the U-shaped clamp and the light rod are slowly lowered by rotating the connecting sleeve.

[0021] This invention features a reasonable and compact structure with ingenious design. By incorporating a connecting sleeve, the U-shaped clamp and the guide rod can be slowly lowered during rotation. Tightening the adjusting nut moves the top rod to the left, thereby clamping the guide rod under the combined action of the inner side of the left end of the clamping cavity and the inner side of the top clamping block. Loosening the adjusting nut moves the top rod to the right, thereby quickly releasing the clamping of the guide rod's outer wall. This invention is characterized by its speed, stability, and high efficiency. Attached Figure Description

[0022] Appendix Figure 1 These are schematic diagrams of the main view structure of Examples 1 to 10.

[0023] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the three-dimensional structure.

[0024] Appendix Figure 3 For the appendix Figure 1 A three-dimensional structural diagram of the U-shaped clamp.

[0025] Appendix Figure 4 For the appendix Figure 1 A three-dimensional structural diagram of the U-shaped card body.

[0026] Appendix Figure 5 For the appendix Figure 1 A three-dimensional structural diagram of the mounting block and support base.

[0027] Appendix Figure 6 For the appendix Figure 1 A three-dimensional structural diagram of the center rod and the clamping block.

[0028] Appendix Figure 7 For the appendix Figure 1 A three-dimensional structural diagram of the connecting sleeve.

[0029] Appendix Figure 8For the appendix Figure 1 A three-dimensional structural diagram of the fixed base.

[0030] The codes in the attached diagram are as follows: 1 is the U-shaped card body, 2 is the clamping cavity, 3 is the mounting block, 4 is the top rod, 5 is the clamping block, 6 is the adjusting nut, 7 is the support base, 8 is the front limiting wing plate, 9 is the rear limiting wing plate, 10 is the front horizontal groove, 11 is the front vertical groove, 12 is the rear horizontal groove, 13 is the rear vertical groove, 14 is the first arc groove, 15 is the second arc groove, 16 is the clamping block, 17 is the connecting neck, 18 is the first inner ring groove, 19 is the second inner ring groove, 20 is the ball bearing, 21 is the pressure cap, 22 is the safety lock pin, 23 is the operating rod, 24 is the upper insertion hole, 25 is the lower insertion hole, 26 is the first insertion long groove, 27 is the second insertion long groove, 28 is the third insertion long groove, 29 is the smooth rod, 30 is the packing box, 31 is the connecting sleeve, and 32 is the fixed base. Detailed Implementation

[0031] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0032] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0033] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0034] Example 1: As shown in the attached document Figures 1 to 8As shown, the guide rod buffer lowering device includes a U-shaped clamp, a connecting neck 17, a connecting sleeve 31, and a fixed base 32. The U-shaped clamp includes a U-shaped clamp body 1, a mounting block 3, a push rod 4, a tightening block 5, and an adjusting nut 6. The U-shaped clamp body 1 has a clamping cavity 2 with an opening to the right. The mounting block 3 is installed on the inner right side of the U-shaped clamp body 1. The mounting block 3 has a through mounting hole in the middle. The push rod 4 is installed in the mounting hole. The tightening block 5, located to the left 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 with an opening to the left. The adjusting nut 6, located to the right of the mounting block 3, is fixedly installed on the right side of the push rod 4 by threads. The U-shaped clamp body 1 has a... The connecting sleeve 31 has a first inner ring groove 18 on the inner side of its upper end and a second inner ring groove 19 on the inner side of its lower end. The connecting sleeve 31 has a first insertion long groove 26 on its right side that is vertically connected and can communicate with its interior. The first inner ring groove 18 has a connecting neck 17 on its upper side that is fixedly installed together with the lower side of the U-shaped card body 1. The connecting neck 17 has a second insertion long groove 27 on its right side that is vertically connected and can communicate with its interior. The second inner ring groove 19 has a fixed base 32 on its lower end located below the connecting sleeve 31, which is fixedly installed by a threaded connection. The fixed base 32 has a third insertion long groove 28 on its right side that is vertically connected and can communicate with its interior. During use, by setting the connecting sleeve 31, the U-shaped clamp and the smooth rod 29 can be slowly lowered when it rotates, thereby effectively controlling and reducing the speed at which the smooth rod 29 is lowered by its own weight, thus playing a buffering role; by tightening the adjusting nut 6, the top rod 4 is moved to the left, thereby clamping the smooth rod 29 under the combined action of the inner side of the left end of the clamping cavity 2 and the inner side of the top clamping block 5; by loosening the adjusting nut 6, the top rod 4 is moved to the right, thereby quickly releasing the clamping on the outer wall of the smooth rod 29.

[0035] The specific implementation process of this embodiment is as follows: First, the connecting sleeve 31 and the fixed base 32 are installed together by threaded connection, so that the first insertion slot 26 and the third insertion slot 28 are both located at the same position on the right side; then, the connected sleeve 31 and the fixed base 32 installed together are installed on the outside of the optical rod 29 located above the optical rod packing box 30 through the first insertion slot 26 and the third insertion slot 28, and the lower side of the fixed base 32 is fixedly installed together with the upper side of the optical rod 29 packing box 30; then, the U-shaped card body 1 is installed on the position above the connecting sleeve 31 through the clamping cavity 2. The outer side of the smooth rod 29 is positioned so that the connecting neck 17 is seated in the first inner ring groove 18; then the push rod 4 is inserted into the mounting hole provided on the mounting block 3 so that the arc-shaped opening of the clamping block 5 faces to the left, and the adjusting nut 6 is installed on the right side of the push rod 4; finally, the mounting block 3 is positioned above the U-shaped clamp body 1 and installed on the inner right side of the U-shaped clamp body 1, and the adjusting nut 6 is tightened so that the push rod 4 moves to the left, so that the corresponding position on the outer side of the smooth rod 29 is clamped under the combined action of the inner side of the left end of the clamping cavity 2 and the inner side of the clamping block 5; when the lower smooth rod 29 is needed, the U-shaped clamp and the smooth rod 29 are slowly lowered by rotating the connecting sleeve 31. Depending on the requirements, the installation method of the fixed base 32 and the bare rod packing box 30 can be that multiple protrusions are provided on the lower side of the fixed base 32, and the upper side of the bare rod packing box 30 is provided with a groove corresponding to each protrusion position. Each protrusion is located in the groove at the corresponding position, thereby preventing the fixed base 32 from rotating with the connecting sleeve 31. Alternatively, the installation method of the fixed base 32 and the bare rod packing box 30 can also be a known detachable fixed installation method, such as flange connection.

[0036] The above-mentioned guide rod buffer lowering device can be further optimized and / or improved according to actual needs:

[0037] Example 2: As shown in the attached document Figure 2 , 7 As shown, it also includes ball bearings 20 and pressure caps 21. The first inner annular groove 18 has several upward-opening hemispherical grooves, each containing a ball bearing 20. A pressure cap 21 is fixedly installed within the first inner annular groove 18, and each pressure cap 21 corresponding to the position of a ball bearing 20 has a limiting hole. The lower side of the connecting neck 17 contacts the ball bearing 20. During use, by providing multiple ball bearings 20, the friction between the connecting sleeve 31 and the lower end of the connecting neck 17 can be reduced when rotating the connecting sleeve 31, thus facilitating the rotation of the connecting sleeve 31.

[0038] Example 3: As shown in the attached document Figures 2 to 5As shown, it also includes a front limiting wing plate 8 and a rear limiting wing plate 9. A front limiting groove is provided on the inner front part of the U-shaped card body 1 corresponding to the position of the mounting block 3. The front limiting groove is L-shaped with an upward opening and can communicate with the clamping cavity 2. The front limiting groove includes a front horizontal groove 10 and a front vertical groove 11. The right end of the front horizontal groove 10 is connected to the front end of the front vertical groove 11. A rear limiting groove is provided on the inner rear part of the U-shaped card body 1 corresponding to the position of the mounting block 3. The rear limiting groove is L-shaped with an upward opening and can communicate with the clamping cavity 2. The rear limiting groove includes a rear horizontal groove 12 and a rear vertical groove 13. The right end of the rear horizontal groove 12 is connected to the rear end of the rear vertical groove 13. A front limiting wing plate 8 located in the front limiting groove is fixedly installed on the front side of the mounting block 3, and a rear limiting wing plate 9 located in the rear limiting groove is fixedly installed on the rear side of the mounting block 3. During use, the L-shaped front limiting wing plate 8 and rear limiting wing plate 9 facilitate the installation of the mounting block 3 on the inner right side of the U-shaped card body 1; the upward-opening front and rear limiting grooves prevent the mounting block 3 from falling off the underside of the U-shaped card body 1. Depending on the requirements, both the front limiting wing plate 8 and the rear limiting wing plate 9 are integrally installed with the mounting block 3.

[0039] Example 4: As shown in the appendix Figure 2 , 3 As shown in Figure 5, the system also includes a support base 7. The support base 7 is fixedly installed on the right side of the mounting block 3 corresponding to the lower left side of the adjusting nut 6. The lower left side of the adjusting nut 6 rests within the support base 7. The adjusting nut 6 includes a first annular portion, a second annular portion, and a hexagonal portion arranged sequentially from left to right. The outer diameter of the first annular portion is larger than the outer diameter of the second annular portion. The support base 7 is a semi-circular ring with an upward opening. The inner left side of the support base 7 has a first arc-shaped groove 14 that matches the first annular portion, and the inner right side of the support base 7 has a second arc-shaped groove 15 that matches the second annular portion. During use, this design provides support for the adjusting nut 6 without affecting its rotation.

[0040] Example 5: As shown in the attached document Figure 3 As shown, it also includes a clamping block 16. The clamping cavity 2 is provided with a clamping block 16 at the left end. The clamping block 16 is a semi-circular arc-shaped plate with its opening facing to the right. During use, by setting the semi-circular arc-shaped clamping block 16, the contact area with the outer wall of the optical rod 29 is increased, thereby improving the overall stability.

[0041] Example 6: As shown in the appendix Figures 1 to 6 As shown, the outer sides of the clamping block 5 and the clamping block 16 are covered with a fluororubber layer. During use, this arrangement increases the friction between the guide rod 29 and the clamping block 5 and clamping block 16, thereby improving overall stability.

[0042] Example 7: As attached Figures 1 to 6As shown, both the clamping block 5 and the clamping block 16 include a steel plate, an adhesive heat insulation layer, and a friction block arranged sequentially from the outside to the inside. During use, this arrangement increases the friction between the polished rod 29 and the clamping blocks 5 and 16, thereby improving overall stability. Depending on the requirements, the clamping block 5 and clamping block 16 can be existing, known brake pad structures, and their friction blocks can be made of resin-based brake materials, powder metallurgy brake materials, carbon / carbon composite brake materials, ceramic-based brake materials, etc.

[0043] Example 8: As attached Figures 1 to 8 As shown, it also includes a safety locking pin 22. The upper left side of the U-shaped card body 1 has an upper insertion hole 24 that extends vertically. The connecting sleeve 31, corresponding to the position of the upper insertion hole 24, has an upward-opening lower insertion hole 25. A safety locking pin 22, with its lower end located within the lower insertion hole 25, is provided inside the upper insertion hole 24. During use, by setting the safety locking pin 22, relative rotation between the U-shaped card and the guide rod 29 and the connecting sleeve 31 can be prevented after the safety locking pin 22 is inserted.

[0044] Example 9: As attached Figure 1 , 2 As shown in Figure 7, it also includes an operating lever 23, which is fixedly installed on both the front and rear middle parts of the connecting sleeve 31. During use, the operating lever 23 facilitates the rotation of the connecting sleeve 31.

[0045] Example 10: As attached Figures 1 to 4 As shown, a method using the above-mentioned optical rod buffer lowering device includes the following steps:

[0046] (1) The connecting sleeve 31 and the fixed base 32 are installed together by 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 side;

[0047] (2) The connecting sleeve 31 and the fixed base 32 installed together are installed on the outside of the light rod 29 located above the light rod packing box 30 through the first insertion long slot 26 and the third insertion long slot 28, and the lower side of the fixed base 32 is fixedly installed together with the upper side of the light rod 29 packing box 30.

[0048] (3) Install the U-shaped card body 1 on the outside of the light rod 29 located above the connecting sleeve 31 through the clamping cavity 2, and seat the connecting neck 17 in the first inner ring groove 18;

[0049] (4) Insert the push rod 4 into the mounting hole provided on the mounting block 3, so that the arc-shaped opening of the clamping block 5 faces to the left, and install the adjusting nut 6 on the right side of the push rod 4;

[0050] (5) Install the mounting block 3 from above the U-shaped card body 1 on the inner right side of the U-shaped card body 1, tighten the adjusting nut 6, and move the top rod 4 to the left, so that the corresponding position on the outer side of the light rod 29 is clamped under the combined action of the inner side of the left end of the clamping cavity 2 and the inner side of the top clamping block 5.

[0051] (6) When the lower light rod 29 is needed, the U-shaped clamp and the light rod 29 are slowly lowered by rotating the connecting sleeve 31.

[0052] During use, this invention allows for the rapid unloading of the upper polished rod 29 clamp during lowering, facilitating personnel removal of the clamp. Simultaneously, by rotating the connecting sleeve 31, the speed at which the polished rod 29 is lowered under its own weight is slowed and controlled, effectively ensuring the downhole tubing is slowly lowered to the bottom of the pump. This eliminates the need for frequent loading and unloading operations involving disassembling and reassembling the polished rod 29 clamp and starting and stopping the pumping unit, simplifying the pump lowering operation, reducing labor intensity, improving work efficiency, and minimizing personnel injury during operation.

[0053] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A rod buffer lowering device, characterized in that... The system includes a U-shaped clamp, a connecting neck, a connecting sleeve, and a fixed base. The U-shaped clamp comprises a U-shaped clamp body, a mounting block, a push rod, a tightening block, and an adjusting nut. The U-shaped clamp body has a clamping cavity opening to the right. A mounting block is installed on the inner right side of the U-shaped clamp body for limiting. The mounting block has a through mounting hole in the middle, and a push rod is installed in the mounting hole. A tightening block located to the left 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 is fixedly installed on the right side of the mounting block via a thread on the right side of the push rod. The U-shaped clip body has a connecting sleeve at its lower end. The upper inner side of the connecting sleeve has a first inner ring groove, and the lower inner side has a second inner ring groove. The right side of the connecting sleeve has a first insertion groove that extends vertically and communicates with its interior. The first inner ring groove contains a connecting neck, the upper side of which is fixedly installed to the lower side of the U-shaped clip body. The right side of the connecting neck has a second insertion groove that extends vertically and communicates with its interior. A fixed base, with its lower end located below the connecting sleeve, is fixedly installed in the second inner ring groove via a threaded connection. The base includes a third insertion slot on the right side of the fixed base, which extends vertically and communicates with the interior of the base. It also includes ball bearings and pressure caps. The first inner ring groove has several upward-opening hemispherical grooves, each containing a ball bearing. A pressure cap is fixedly installed in the first inner ring groove, and each pressure cap corresponding to a ball bearing position has a limiting hole. The lower side of the connecting neck contacts the ball bearing. The base also includes a front limiting wing plate and a rear limiting wing plate. A front limiting groove is provided on the inner front part of the U-shaped card body corresponding to the mounting block position, with the front limiting groove opening upwards. The L-shaped groove that can communicate with the clamping cavity has a front limiting groove including a front horizontal groove and a front vertical groove. The right end of the front horizontal groove is connected to the front end of the front vertical groove. The U-shaped card body corresponding to the position of the mounting block has a rear limiting groove on its inner rear side. The rear limiting groove is L-shaped with an upward opening and can communicate with the clamping cavity. The rear limiting groove includes a rear horizontal groove and a rear vertical groove. The right end of the rear horizontal groove is connected to the rear end of the rear vertical groove. A front limiting wing plate located in the front limiting groove is fixedly installed on the front side of the mounting block, and a rear limiting wing plate located in the rear limiting groove is fixedly installed on the rear side of the mounting block.

2. The optical rod buffer lowering device according to claim 1, characterized in that... It also includes a support base, which is fixedly installed on the right side of the mounting block corresponding to the lower left side of the adjusting nut. The lower left side of the adjusting nut is seated in the support base. The adjusting nut includes a first ring portion, a second ring portion, and a hexagonal portion arranged sequentially from left to right. The outer diameter of the first ring portion is larger than the outer diameter of the second ring portion. The support base is a semi-circular ring with an upward opening. The inner side of the left end of the support base is provided with a first arc-shaped groove that matches the first ring portion, and the inner side of the right end of the support base is provided with a second arc-shaped groove that matches the second ring portion.

3. The optical rod buffer lowering device according to claim 1 or 2, characterized in that... It also includes a clamping block, which is provided at the left end of the clamping cavity. The clamping block is a semi-circular arc plate with an opening to the right.

4. The optical rod buffer lowering device according to claim 3, characterized in that... The outer sides of the clamping block and the clamping block are covered with a fluororubber layer.

5. The optical rod buffer lowering device according to claim 3, characterized in that... Both the clamping block and the top clamping block include a steel plate, an adhesive heat insulation layer, and a friction block arranged sequentially from the outside to the inside.

6. The optical rod buffer lowering device according to claim 1, 2, 4, or 5, characterized in that... It also includes a safety locking pin. The upper left side of the U-shaped card body has an upper insertion hole that runs through the top and bottom. The connecting sleeve corresponding to the position of the upper insertion hole has a lower insertion hole with the opening facing upward. The upper insertion hole has a safety locking pin with its lower end located in the lower insertion hole.

7. The optical rod buffer lowering device according to claim 3, characterized in that... It also includes a safety locking pin. The upper left side of the U-shaped card body has an upper insertion hole that runs through the top and bottom. The connecting sleeve corresponding to the position of the upper insertion hole has a lower insertion hole with the opening facing upward. The upper insertion hole has a safety locking pin with its lower end located in the lower insertion hole.

8. The optical rod buffer lowering device according to claim 1, 2, 4, 5, or 7, characterized in that... It also includes operating levers, which are fixedly installed on the middle of the front side and the middle of the rear side of the connecting sleeve.

9. The optical rod buffer lowering device according to claim 3, characterized in that... It also includes operating levers, which are fixedly installed on the middle of the front side and the middle of the rear side of the connecting sleeve.

10. The optical rod buffer lowering device according to claim 6, characterized in that... It also includes operating levers, which are fixedly installed on the middle of the front side and the middle of the rear side of the connecting sleeve.

11. A method for lowering a guide rod buffer as described in any one of claims 1 to 10, characterized in that... The steps include the following: (1) Install the connecting sleeve and the fixed base together by threaded connection, so that the first insertion slot and the third insertion slot are both located at the same position on the right side; (2) The connecting sleeve and the fixed base installed together are installed on the outside of the optical rod located above the optical rod packing box through the first insertion long slot and the third insertion long slot, and the lower side of the fixed base is fixedly installed together with the upper side of the optical rod packing box; (3) Install the U-shaped card body on the outside of the light rod located above the connecting sleeve through the clamping cavity, and place the connecting neck seat in the first inner ring groove; (4) Insert the push rod into the mounting hole provided on the mounting block, so that the arc-shaped opening of the clamping block faces to the left, and install the adjusting nut on the right side of the push rod; (5) Install the mounting block from above the U-shaped card body on the inner right side of the U-shaped card body, tighten the adjusting nut, and move the top rod to the left. Thus, the corresponding position on the outer side of the smooth 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 top clamping block. (6) When the lower light rod is needed, the U-shaped clamp and the light rod are slowly lowered by rotating the connecting sleeve.

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