CN209976509U

CN209976509U - Recovery type ash squeezing device

Info

Publication number: CN209976509U
Application number: CN201922288946.3U
Authority: CN
Inventors: 王玉婷; 徐龙云; 侯传江; 罗潇; 贾秋峰; 蔡雪冬
Original assignee: SHANDONG PURUISIDE PETROLEUM TECHNOLOGY Co Ltd
Current assignee: SHANDONG PURUISIDE PETROLEUM TECHNOLOGY Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-01-21
Anticipated expiration: 2029-12-19

Abstract

The utility model discloses a recovery type ash squeezing device, which is used for temporary or permanent plugging and selective plugging of oil, gas and water wells. The device comprises a multi-stage piston pressing mechanism, a setting locking mechanism and a bidirectional slip anchoring mechanism. Multistage piston hitting mechanism can increase the setting power to guarantee the setting quality, set up to split type structure through with support ring, set nut and ball seat simultaneously, made things convenient for the assembly of instrument on the one hand, on the other hand will cut pin power and support ring and move down the time and separate with the frictional force that the locking claw produced, total power when can reducing hydraulic pressure hitting the ball seat, thereby guaranteed the smoothness nature of hitting the ball seat in the use. Can improve anchoring effect through two-way slips anchoring mechanism, simultaneously through the chucking protection step that sets up on the seat locking mechanism, can prevent effectively that the packing element from droing and leading to the unable sheathed tube condition of chucking of slips at the well-entering in-process, guarantee that the packer sits to seal firmly, simple easy-to-use is applicable to the packing of multiple oil well and separates the operation, safe and reliable.

Description

Recovery type ash squeezing device

Technical Field

The utility model relates to a supporting instrument in the oil development well, concretely relates to be used for crowded ash device of recovery formula of interim or permanent shutoff and selectivity shutoff of oil, gas, well.

Background

In the process of oil field development, especially when needing crowded grey operation, often need carry out interim or permanent shutoff to oil, gas, water layer with shutoff instrument in the pit, when setting, the glue section of thick bamboo is compressed to the hydraulic cylinder under the effect of the fluid in the body, and fixes the hydraulic cylinder through the retaining member simultaneously to prevent the back-off of hydraulic cylinder. However, the traditional packer often has the problems of infirm setting or midway setting and the like, most of the packers on the market have the problem of small setting force at present, and the setting force is insufficient, so that the sealing test is unqualified. In addition, the ball seat is directly arranged in the locking claw through external force, the upper outer circular surface and the lower outer circular surface of the ball seat are in direct contact with the inner circular surface of the locking claw, friction force is large when the ball seat is landed, pressure can only be increased, the ball seat is prone to being unsmooth in falling, and working difficulty is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a defect to prior art existence provides one kind and can improve the setting force, is applicable to multiple oil well shutoff job site, and safe and reliable can satisfy the crowded grey device of recovery formula of the demand of oil field development in-process to oil, gas, water layer temporary or permanent shutoff.

The technical scheme of the utility model is that: recovery type ash squeezing device, comprising:

the multistage piston pressing mechanism comprises an upper joint, a hydraulic cylinder, an upper piston, an upper connecting rod, a middle piston, a lower connecting rod, a lower piston, a locking claw, a ball seat, a steel ball and a supporting device, wherein the inner wall and the outer wall of the lower end of the upper joint are respectively in threaded connection with the upper connecting rod and the hydraulic cylinder, the upper joint, the upper connecting rod and the hydraulic cylinder form an annular upper piston cavity, and the upper piston is positioned in the upper piston cavity; the upper connecting rod is in threaded connection with the lower connecting rod, the upper connecting rod, the lower connecting rod and the hydraulic cylinder form a middle piston cavity, the middle piston is located in the middle piston cavity, the lower connecting rod, the locking claw and the hydraulic cylinder form a lower piston cavity, the lower piston is located in the lower piston cavity, the lower end of the upper piston is in sealing contact with the middle piston, the lower end of the middle piston is in sealing contact with the lower piston, the lower end of the lower connecting rod is in threaded connection with the locking claw, and through holes for communicating the inner cavity with the piston cavity are respectively formed in the inner walls of the upper connecting rod, the lower connecting rod and the locking claw; the supporting device is arranged at the lower end of the ball seat and is used for supporting the ball seat; the ball seat is arranged on the inner wall of the locking claw through a pin, and the steel ball seat is arranged in an inner cavity of the ball seat;

the setting and locking mechanism comprises a pressing ring, a sheath, a deblocking joint, a locking ring, a central pipe, a sleeve, a positioning ring, a rubber cylinder and a spacing ring, wherein the upper end of the pressing ring is positioned in the lower piston cavity and is in contact with the lower piston, the lower end of the pressing ring is in threaded connection with the sheath, the upper end and the lower end of the deblocking joint are respectively connected with the pressing ring and the central pipe through pins, the locking ring is positioned in a cavity formed by the sheath and the pressing ring and drives the locking ring to move along the axial direction of the deblocking joint through the sheath, and locking teeth of the locking ring are meshed with tooth buckles on the surface of the central pipe; the sleeve is positioned between the central pipe and the sheath and is arranged at the lower end of the deblocking joint, a positioning ring is arranged on the inner wall of the lower end of the sheath through a pin, and the sleeve is seated on the positioning ring; the spacer ring is in threaded connection with the lower end of the sleeve, the rubber cylinder is positioned between the sheath and the spacer ring and sleeved outside the sleeve, and the lower end of the locking claw is in threaded connection with the inner wall of the central tube;

the bidirectional slip anchoring mechanism comprises an upper cone, a slip cover, a slip, a plate spring, a lower cone, an inner protective cap, a righting ring and a lower joint, wherein the upper part of the upper cone is in threaded connection with the lower part of the sleeve, the upper part of the lower cone is in threaded connection with the central pipe, and the lower part of the lower cone is connected with the lower joint; two ends of the slip are respectively matched with the conical surfaces of the upper cone and the lower cone, and the upper cone, the plate spring, the slip and the lower cone are arranged in the slip cover; the lower part of the slip cover is in threaded connection with the inner protective cap, and the inner protective cap is in threaded connection with the lower cone; the righting ring is sleeved on the lower cone;

crowded grey mechanism, crowded grey mechanism is including filling a section of thick bamboo, bearing ring, crowded grey packing element, packing element clamping ring, sliding sleeve and plug, fill a section of thick bamboo upper end and lower clutch lower extreme threaded connection, the outside threaded connection that still of packing element has the tighrening ring, bearing ring, packing element clamping ring and crowded grey packing element overlap from top to bottom in proper order and establish and fill a section of thick bamboo surface, the bearing ring slides and alternates in the sliding tray that fills a section of thick bamboo, crowded grey packing element lower extreme is sat on filling a section of thick bamboo outer wall step, the lower extreme at filling a section of thick bamboo is installed to the plug, the sliding sleeve is installed and is passed through the spring and is connected with the plug filling a section of thick bamboo inner chamber and.

Preferably, the supporting device comprises a positioning nut and a supporting ring, the positioning nut is connected to the lower end of the ball seat in a threaded mode, and the supporting ring is arranged above the positioning nut and is in sliding clearance fit with the lower end of the ball seat.

Preferably, the lower end of the sheath is provided with a clamping protection step, and the upper end of the sleeve and the clamping protection step form an extrusion gap for extruding the rubber cylinder.

Preferably, the axial cross section of the upper piston and the axial cross section of the middle piston are of an inverted U-shaped structure, the outer sides of the middle piston and the lower piston are respectively provided with a piston step for seating the lower ends of the upper piston and the middle piston, and the pistons are connected with the upper connecting rod, the lower connecting rod and the hydraulic cylinder in a sealing sliding mode.

Preferably, the outer side of the upper end of the central tube is provided with a plurality of locking tooth slide ways parallel to each other, unlocking claws at the lower end of the unlocking joint are arranged at intervals with the locking tooth slide ways and are connected with the central tube through pins, and unlocking steps matched with the locking ring are obliquely arranged at the lower ends of the unlocking claws respectively.

Preferably, the inner wall of the deblocking joint is provided with an internal thread matched with a fishing tool.

Preferably, the upper connecting rod is in threaded connection with the lower connecting rod, the inner wall of the upper connecting rod is on the same plane, and the outer diameter of the lower end of the upper connecting rod is larger than that of the upper end of the lower connecting rod.

Compared with the prior art, the utility model, have following advantage: the multi-stage piston pressing mechanism provides setting pressure for hydraulic setting, the multi-stage piston can increase setting force, and therefore setting quality is guaranteed, meanwhile, due to the split type structure of the ball seat, on one hand, assembly of tools is facilitated, on the other hand, shearing pin force and friction force generated by the locking claw when the support ring moves downwards are separated, total force generated when the ball seat is hydraulically set can be reduced, and therefore smoothness of setting the ball seat in the using process is guaranteed; the anchoring effect can be improved through the bidirectional slip anchoring mechanism, and meanwhile, the situation that slip cannot clamp a sleeve pipe due to the fact that a rubber barrel falls off in the well entering process can be effectively prevented through the clamping protection step arranged on the setting locking mechanism, and the setting stability of the packer is guaranteed; the ash squeezing mechanism and the ash squeezing service tool are convenient to achieve ash squeezing operation, simple and easy to use, suitable for packing operation of various oil wells, safe and reliable, and capable of meeting the requirements for temporary or permanent plugging of oil, gas and water layers in the oil field development process.

Drawings

FIG. 1 is a schematic structural view of the upper portion of a multi-stage piston press;

FIG. 2 is a schematic structural view of a lower portion of a multi-stage piston press;

FIG. 3 is a schematic structural view of a portion of the setting locking mechanism;

FIG. 4 is a schematic structural view of a bi-directional slip anchoring mechanism;

FIG. 5 is a schematic view of the ash squeezing tool;

FIG. 6 is a view showing the upper half of the present invention in use;

fig. 7 and 8 are usage state diagrams of the lower half part of the present invention;

FIG. 9 is a mating view at the locking ring of the setting locking mechanism;

FIG. 10 is a schematic diagram of the ash squeezing service tool.

Wherein, fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5 are connected together in sequence; figures 6, 7 and 8 are connected together;

in the figure: 1. the hydraulic device comprises an upper joint, 2, a hydraulic cylinder, 3, an upper piston, 4, an upper connecting rod, 5, a middle piston, 6, a lower connecting rod, 7, a lower piston, 8, a locking claw, 9, a ball seat, 10, an unlocking step, 11, a through hole, 12, a steel ball, 13, a support ring, 14, a positioning nut, 15, a clamping protection step, 16, a pressing ring, 17, a sheath, 18, an unlocking joint, 19, a locking ring, 20, a central pipe, 21, a locking tooth slideway, 22, a sleeve, 23, an unlocking claw, 24, a positioning ring, 25, a rubber barrel, 26, a spacer ring, 27, an upper cone body, 28, a slip cover, 29, a slip, 30, a plate spring, 31, a lower cone body, 32, an inner protective cap, 33, a centering ring, 34, a lower joint, 35, a fastening ring, 36, a bearing ring, 37, a rubber barrel pressing ring, 38, a cement extruding rubber barrel, 39, a filling barrel, 40, a sliding sleeve, 41, a wire plug, 42.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example one

As shown in fig. 1-5, the recycling type ash squeezing device of the present invention comprises a multi-stage piston pressing mechanism, a setting locking mechanism and a two-way slip anchoring mechanism.

As shown in fig. 1, the multistage piston pressing mechanism includes: the hydraulic cylinder comprises an upper joint 1, a hydraulic cylinder 2, an upper piston 3, an upper connecting rod 4, a middle piston 5, a lower connecting rod 6, a lower piston 7, a locking claw 8, a ball seat 9, a steel ball 12, a support ring 13 and a positioning nut 14, wherein the inner wall and the outer wall of the lower end of the upper joint 1 are respectively in threaded connection with the upper connecting rod 4 and the hydraulic cylinder 2, the upper joint 1, the upper connecting rod 4 and the hydraulic cylinder 2 form an annular upper piston cavity, and the upper piston 1 is positioned in the upper piston cavity; go up connecting rod 4 and lower connecting rod 6 threaded connection, go up connecting rod 4, piston chamber in lower connecting rod 6 and the 2 formation of pneumatic cylinder, well piston 5 is located well piston chamber, lower connecting rod 6, pawl 8 forms piston chamber down with pneumatic cylinder 2, lower piston 7 is located down the piston chamber, go up 3 lower extremes of piston and well piston 5, well piston 5 lower extreme and lower piston 7 all sealing contact, 6 lower extremes of lower connecting rod and pawl 8 threaded connection, go up connecting rod 4, be equipped with through-hole 11 that is used for intercommunication inner chamber and piston chamber on lower connecting rod 6 and the 8 inner walls of pawl respectively, liquid gets into upper piston chamber, well piston chamber and lower piston chamber respectively through-hole 11 when suppressing, and promote upper piston 3, well piston 5 and lower piston 7 downstream.

As shown in figure 2, a positioning nut 14 is in threaded connection with the lower end of a ball seat 9, a support ring 13 is arranged between the positioning nut 14 and a locking claw 8 and is in sliding fit with the lower end of the locking claw 8, a steel ball 12 is seated in the inner cavity of the ball seat 9, the ball seat 9 is connected with the locking claw 8 through a pin under the supporting action of the positioning nut 14 and the support ring 13, when the pressing is needed, the steel ball 12 is thrown in to close the central inner cavity of the steel ball 12, then the steel ball is pressed by a pump truck, the pin is firstly cut under the pressure action to enable the ball seat 9 to drive the positioning nut 14 to move downwards, after the pin is cut, the ball seat 9 drives the support ring 13 to move downwards to separate from the locking claw 8, then liquid enters each piston cavity through a through hole 11, the support ring 13, the positioning nut 14 and the ball seat 9 are arranged into a split structure, on one hand, the total force of the hydraulic landing ball seat 9 can be reduced, so that the smoothness of landing the ball seat 9 in the using process is ensured.

In addition, as shown in fig. 3, the setting and locking mechanism comprises a press ring 16, a jacket 17, a deblocking joint 18, a lock ring 19, a central pipe 20, a sleeve 22, a positioning ring 24, a rubber cylinder 25 and a spacer ring 26, wherein the upper end of the press ring 16 is positioned in the lower piston cavity and is in contact with the lower end face of the lower piston 7, namely, the upper piston 3, the middle piston 5 and the lower piston 7 are positioned between the upper joint 1 and the locking claw 8 and are in compression joint with the press ring 16, the lower end of the press ring 16 is in threaded connection with the jacket 17, the lower end of the locking claw 8 is in threaded connection with the inner wall of the central pipe 20, and the upper end and the lower end of the deblocking joint 18 are respectively connected with the press ring 16 and the central pipe 20 through pins, so that the press ring 16 can be pressed downwards until the press. The locking ring 19 is installed in the sheath 17 and sleeved outside the deblocking joint 18 and the central tube 20, locking teeth on the locking ring 19 and teeth on the outer surface of the central tube 20 are obliquely and unidirectionally moved to lock teeth, so that locking and anti-backing effects are achieved, when the sheath 17 moves downwards, the locking ring 19 is driven to move downwards along the central tube 20, and when the sheath moves to a preset position, the locking teeth of the locking ring 19 are meshed with the teeth on the surface of the central tube 20, so that the position of the sheath 17 can be locked.

The inner wall of the unsealing connector 18 is provided with internal threads matched with a fishing tool. A sleeve 22 is positioned between the central tube 20 and the sheath 17 and arranged at the lower end of the deblocking joint 18, a positioning ring 24 is mounted on the inner wall of the lower end of the sheath 17 through a pin, the sleeve 22 is seated on the positioning ring 24, and thus the position of the sleeve 22 is determined through the positioning ring 24; the rubber cylinder 25 for sealing is sleeved on the outer side of the sleeve 22, the spacer ring 26 is in threaded connection with the lower end of the sleeve 22 to play a role in fixing and supporting, and therefore when the sheath 17 drives the sleeve 22 to move downwards to a certain position, the rubber cylinder 25 is extruded, and setting is achieved.

In addition, as shown in fig. 4, the bidirectional slip anchoring mechanism includes an upper cone 27, a slip cover 28, slips 29, a plate spring 30, a lower cone 31, an inner nut 32, a centralizing ring 33 and a lower joint 34, wherein the upper part of the upper cone 27 is in threaded connection with the lower part of the sleeve 22, the upper part of the lower cone 31 is in threaded connection with the central pipe 20, and the lower part is in threaded connection with the lower joint 34; two ends of the slip 29 are respectively in conical fit with the upper cone 27 and the lower cone 31, and the lower part of the upper cone 27, the plate spring 30, the slip 29 and the upper part of the lower cone 31 are arranged in the slip cover 28; the lower portion of the slip cover 28 is in threaded connection with an inner protective cap 32, the inner protective cap 32 is in threaded connection with a lower cone 31, and a centralizing ring 33 is sleeved on the lower cone 31. After the rubber cylinder 25 is sealed, the upper cone 27 and the lower cone 31 push slips 29 to extend out of the slip cover 28 to bite the inner wall of the casing in the moving process when the sheath 17 is pressed down continuously; the tooth of catch 19 and the tooth of center tube 20 are detained intermeshing, and packer inner structure auto-lock keeps packing element 25 and slips 29 bloated tightly and forms sealedly on the casing wall, and along with the increase of pressure in the tubular column, slips 29 can be tighter the top on the sheathed tube pipe wall, and the extrusion that packing element 25 received also can be bigger, makes the packer produce great setting power.

In addition, as shown in fig. 5, the filling cylinder 39 is designed such that four blocks are cut off uniformly at the upper end to form a four-jaw structure and internal and external threads are turned to form a sliding groove of the filling cylinder 39, so that the pressure ring 36 moves downward along the sliding groove during the extrusion process, thereby extruding the lime packing cylinder 38. The external thread of the lower joint 34 is connected with the internal thread of the filling cylinder 39, the fastening ring 35 is connected with the external thread of the filling cylinder 39 to fasten the connection position of the lower joint 34 and the filling cylinder 39 and limit the position of the pressure-bearing ring 36, the pressure-bearing ring 36 is inserted into the upper end of the filling cylinder 39, the rubber cylinder press ring 37 is connected with the lower rubber cylinder press ring 37, the rubber cylinder press ring 37 and the ash squeezing rubber cylinder 38 are sleeved on the filling cylinder 39, the lower end of the filling cylinder 39 is connected with the plug 41 in a threaded manner, and the sliding sleeve 40 is positioned inside the lower end of the filling cylinder.

As shown in fig. 9, a plurality of mutually parallel locking tooth slide ways 21 protruding out of the central tube 20 are arranged on the outer side of the upper end of the central tube 20, unlocking claws 23 at the lower end of the deblocking joint 18 are arranged at intervals from the locking tooth slide ways 21 and connected with the central tube 20 through pins, and deblocking steps 10 matched with locking rings 19 are respectively arranged at the lower ends of the unlocking claws 23 in an inclined manner. During deblocking, through lifting deblocking joint 18, deblocking step 10 can be utilized to drive locking ring 19 to move upwards to prop open locking ring 19 and make the tooth of locking tooth and center tube 20 detain and break away from, play the effect of unblock.

Example two

Further, the sheath 17 lower extreme is equipped with chucking protection step 15, the upper end of sleeve 22 forms the extrusion clearance that is used for extruding packing element 25 with chucking protection step 15, through this adjustable extrusion clearance, prevent in slip 29 withdrawal slip cover 28 when packing element 25 became invalid or other reasons appear in the packer setting in-process, the chucking protection step 15 of sheath 17 lower extreme design, can prevent effectively that packing element 25 from droing and leading to the unable chucking sheathed tube condition of slip 29 in going into the well in-process, it is firm to guarantee the packer setting.

EXAMPLE III

Furthermore, the axial cross sections of the upper piston 3 and the middle piston 5 are of an inverted U-shaped structure, the outer sides of the middle piston 5 and the lower piston 7 are respectively provided with a piston step for seating the lower ends of the upper piston 3 and the middle piston 5, and the upper piston 3, the middle piston 5, the lower piston 7, the upper connecting rod 4, the lower connecting rod 6 and the hydraulic cylinder 2 are in sealing sliding connection. Three level piston hydraulic pressure setting mechanism through above-mentioned structure is being suppressed and is being set 3 pistons of in-process and exert pressure to clamping ring 16 simultaneously, can make the setting more firm.

Go up connecting rod 4 and connecting rod 6 threaded connection down, and the inner wall is on a plane, and the lower extreme external diameter of going up connecting rod 4 and connecting rod 6 down is greater than the upper end external diameter.

In the field operation of oil gas field, the utility model discloses a crowded grey device of recovery type's work progress does:

as shown in fig. 6, 7 and 8, setting: connecting the recovery type ash squeezing device with an oil pipe, putting the recovery type ash squeezing device into a preset underground position, checking the depth, putting a steel ball 12, pressing the steel ball by using a pump truck, simultaneously bearing and pushing the compression ring 16, the sleeve 22 and the spacer ring 26 to move downwards by the upper piston 3, the middle piston 5 and the lower piston 7, compressing the rubber cylinder 25 to seal the annular space of the sleeve, and simultaneously under the action of the upper cone 27 and the lower cone 31, the upper cone 27 moves downwards to push the slip 29 to extend outwards out of the slip cover 28 and bite the inner wall of the sleeve; the teeth of the locking ring 19 are meshed with the teeth of the central pipe 20, so that the self-locking of the internal structure of the packer is realized, the rubber sleeve 25 and the slip 29 are kept to be expanded on the wall of the casing, and the setting is realized. After setting is finished, the lower part of the recovery type ash squeezing device is set at a designated position underground, and the upper joint 1, the upper connecting rod 4, the lower connecting rod 6, the locking claw 8, the upper piston 3, the middle piston 5, the lower piston 7, the hydraulic cylinder 2 and the ball seat 9 are lifted out of the ground along with the setting pipe column by lifting the pipe column in 15 circles in positive rotation.

Ash squeezing: the ash squeeze service tool is connected to the ash squeeze string and then lowered into the well as shown in figure 10. The ash squeezing service tool enters the main body of the recovery type ash squeezing device, the pressure bearing ring 36 is pushed to move downwards, the pressure bearing ring 36 drives the rubber cylinder pressure ring 37 to squeeze the ash squeezing rubber cylinder 38 to form a sealing ring area, the ash squeezing service tool continues to push the sliding sleeve 40, when an ash squeezing hole of the sliding sleeve 40 is communicated with an ash squeezing hole of the ash squeezing filling cylinder 39, ash squeezing can be started, after the ash squeezing is finished, the pressure is held for waiting for coagulation, the ash squeezing service tool is lifted, and the sliding sleeve 40 returns to the initial sealing state under the action of the spring 42.

Deblocking: the lower deblocking and fishing mechanism is connected to a deblocking joint 18, a fishing tool is in threaded engagement with the deblocking joint 18, then the pipe column is lifted, the deblocking joint 18 is continuously lifted, a deblocking step 10 at the lower end of the deblocking joint 18 props up a lock ring 19 to remove self locking of the recycling type dust squeezing device, a rubber sleeve 25 contracts, an upper cone 27 moves upwards and brings a slip 29 into a slip cover 28, and the packer is deblocked, and the tool is lifted out of the ground along with the pipe column.

The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.

Claims

1. Recovery type ash squeezing device is characterized by comprising:

crowded grey mechanism, crowded grey mechanism is including filling a section of thick bamboo, bearing ring, crowded grey packing element, packing element clamping ring, sliding sleeve and plug, fill a section of thick bamboo upper end and lower clutch lower extreme threaded connection, fill the outside threaded connection that still of section of thick bamboo has the tighrening ring, bearing ring, packing element clamping ring and crowded grey packing element overlap from top to bottom in proper order and establish and fill a section of thick bamboo surface, the packing element clamping ring slides and alternates in the sliding tray that fills a section of thick bamboo, crowded grey packing element lower extreme is sat on filling a section of thick bamboo outer wall step, the lower extreme at filling a section of thick bamboo is installed to the plug, the sliding sleeve is installed and is passed through the spring and is connected with the plug filling a section of thick.

2. The recycling type dust extrusion device as set forth in claim 1, wherein: the supporting device comprises a positioning nut and a supporting ring, the positioning nut is in threaded connection with the lower end of the ball seat, and the supporting ring is arranged above the positioning nut and is in sliding clearance fit with the lower end of the ball seat.

3. The recycling type dust extrusion device as set forth in claim 2, wherein: the lower end of the sheath is provided with a clamping protection step, and the upper end of the sleeve and the clamping protection step form an extrusion gap for extruding the rubber cylinder.

4. The recycling type dust extrusion device as set forth in claim 2, wherein: the axial cross section of the upper piston and the axial cross section of the middle piston are of inverted U-shaped structures, the outer sides of the middle piston and the lower piston are respectively provided with a piston step for the lower end of the upper piston and the lower piston to be located, and the pistons are connected with the upper connecting rod, the lower connecting rod and the hydraulic cylinder in a sealing sliding mode.

5. The recycling type dust extrusion device as set forth in claim 2, wherein: the outer side of the upper end of the central tube is provided with a plurality of locking tooth slide ways parallel to each other, unlocking claws at the lower end of the unlocking joint are arranged at intervals with the locking tooth slide ways and are connected with the central tube through pins, and unlocking steps matched with the locking ring are obliquely arranged at the lower ends of the unlocking claws respectively.

6. The recycling type dust extrusion device of claim 5, wherein: the inner wall of the deblocking joint is provided with an internal thread matched with a fishing tool.

7. The recycling type dust extrusion device of claim 5, wherein: the upper connecting rod is in threaded connection with the lower connecting rod, the inner wall of the upper connecting rod is on the same plane, and the outer diameter of the lower end of the upper connecting rod is larger than that of the upper end of the lower connecting rod.