CN215789570U - Double-lever wrench for assembling and disassembling groove steel pipe - Google Patents

Abstract

A double-lever wrench for assembling and disassembling channel steel pipes comprises a wrench, a main clamp, a secondary clamp and two connecting plates; the wrench comprises a lever, a handle is arranged at the upper end of the lever, a third semi-arc plate is arranged at the lower end of the lever, and an arc-shaped opening is formed in the third semi-arc plate; the main clamping device comprises a connector clamping ring, and convex ribs are arranged on the inner wall of the connector clamping ring; the slave clamp comprises a steel pipe clamping ring; the steel pipe clamping ring is provided with a telescopic sliding block for clamping the excircle of the steel pipe, and the slave clamping device further comprises a clamping wrench for driving the telescopic sliding block to stretch; the two ends of the connector clamping ring are hinged with the two ends of an arc opening of the arc opening at the lower end of the lever to form a first hinge point, one ends of the two connecting plates are hinged with the two sides of the three outer walls of the semi-arc plate at the upper part of the arc opening respectively to form a third hinge point, the three positions of the hinge points are located at the upper part of the first hinge point, and the other ends of the two connecting plates are hinged to the outer walls at the two ends of the steel pipe clamping ring to form a second hinge point. The utility model integrates the loading and unloading functions into a whole and can realize the insertion/extraction of the groove steel pipe and the joint.

Description

Double-lever wrench for assembling and disassembling groove steel pipe

Technical Field

The utility model relates to a pipeline connecting tool, in particular to a channel steel pipe assembling and disassembling tool.

Background

In modern war, the main approach of oil guarantee in war is to transport by oil pipeline, and guarantee that oil pipeline accurately arrives at the appointed position in time to guarantee the oil smoothly flows in war, which is a fundamental work that must be done in preparation of military war. For the large-batch frequent connection and disassembly of pipelines at the replacement and conveying place, the frequent connection and disassembly operation is carried out between the pipelines and the connectors. Generally, an oil pipeline is formed by connecting a plurality of groove steel pipes through joints, in the connecting process, the groove steel pipes are paved on the ground along the pipeline direction one by one, when the groove steel pipes are connected with the groove steel pipes, the groove steel pipes are butted after being moved one by one, and after the oil pipeline is completed, the oil pipeline needs to be disassembled. For example, the weight of the 6m groove steel pipe is 32kg, the assembling and disassembling process wastes time and labor, and the utility model needs to invent a groove steel pipe assembling and disassembling tool urgently.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides a plugging tool for assembling and disassembling a channel steel pipe, an operator can vertically perform pipeline assembling and disassembling operation, continuous stooping is avoided, the operation efficiency is high, the assembling and disassembling functions are integrated, and the insertion/extraction of the channel steel pipe and a joint can be realized.

The technical scheme of the utility model is as follows: the method comprises the following steps:

the wrench comprises a lever, a handle is arranged at the upper end of the lever, a third semi-arc plate is arranged at the lower end of the lever, the third semi-arc plate forms an arc opening, the upper part of the arc opening is a first arc bottom, and the lower part of the arc opening is a first arc opening;

the main clamping device comprises a connector clamping ring, the connector clamping ring is made of a semicircular arc plate I, and a convex rib matched with an annular groove in the middle of the excircle of the joint is arranged on the inner wall of the connector clamping ring;

the secondary clamping device comprises a steel pipe clamping ring, the steel pipe clamping ring is made of a semicircular arc plate II, the upper part of the steel pipe clamping ring is provided with an arc bottom II, and the lower part of the steel pipe clamping ring is provided with an arc opening II; the steel pipe clamping ring is provided with a telescopic sliding block for clamping the excircle of the steel pipe, and the slave clamping device further comprises a clamping wrench for driving the telescopic sliding block to stretch;

the two connecting plates are symmetrically arranged on the first arc opening of the third semi-arc plate and two sides of the second arc opening of the steel pipe clamping ring; the semi-arc plate III and the steel pipe clamp ring are arranged on the left side and the right side along the length direction I of the connecting plate;

the two ends of the connector clamping ring are hinged with the two ends of an arc opening of the arc opening at the lower end of the lever to form a first hinge point, one ends of the two connecting plates are hinged with the two sides of the three outer walls of the semi-arc plate at the upper part of the arc opening respectively to form a third hinge point, the three positions of the hinge points are located at the upper part of the first hinge point, and the other ends of the two connecting plates are hinged to the outer walls at the two ends of the steel pipe clamping ring to form a second hinge point. The first hinge point and the third hinge point are eccentric distances, the wrench swings along the first hinge point, and the steel pipe clamping ring can be pushed or pulled to move by a corresponding horizontal distance due to the existence of the eccentric distances.

The two telescopic sliding blocks are movably and symmetrically arranged at the radial hole on the steel pipe clamping ring; the second hinge point is provided with two parts, and each second hinge point is provided with a telescopic sliding block.

The telescopic sliding block comprises a clamping block, a bolt and a telescopic shaft, the bolt and the telescopic shaft are fixed on the clamping block, a flat hole in the clamping wrench is connected with an outer flat square head at the outer end of the telescopic shaft, the middle part of the telescopic shaft penetrates through a shaft sleeve at a radial hole, an inner hole of the shaft sleeve is a stepped hole matched with a large head part at the end part of the telescopic shaft, and the inner end of the rotating shaft is in threaded connection with the bolt; the telescopic shaft comprises a movable shaft arranged at the inner end and a rotating shaft arranged at the outer end, and the rotating shaft is matched with the movable shaft through a spiral inclined plane; the first thin shaft part at the outer end of the rotating shaft extends out of the outer end of the inner hole of the shaft sleeve, the first thin shaft part outside the inner hole of the shaft sleeve is connected with the clamping wrench, the second thin shaft part is arranged at the inner end of the moving shaft at the inner end of the inner hole of the shaft sleeve, the second thin shaft part is sleeved with a compression spring, and the end parts of the second thin shaft part are fixedly connected with the bolt. The shaft sleeve is fixed with the steel pipe clamping ring, the inner step hole of the shaft sleeve is matched with the outer step shaft of the rotating shaft, when the rotating shaft rotates, the movable shaft is driven to stretch, the sliding block body generates axial motion, when the sliding block body clamps the steel pipe, the large head part of the telescopic shaft supports against the inner step of the shaft sleeve, and the inner step of the shaft sleeve is a main bearing force contact surface.

Two ends of the semi-arc plate III are provided with a rotating pin shaft III, two ends of the steel pipe clamping ring are fixedly provided with a shaft sleeve, one end of each of the two connecting plates is sleeved on the rotating pin shaft III to form a hinge joint III, and the other end of each of the two connecting plates is respectively sleeved on the shaft sleeve to form a hinge joint II.

When in use: the connector snap ring is fixed relative to the joint position, and when the spanner swings along the first pin joint, the steel pipe snap ring moves back and forth relative to the connector snap ring through the drive of the connecting plate, and the connector snap ring is located in the movement track of the three inner walls of the semi-arc plate. When the spanner swings to the maximum limit position, the three inner walls of the semi-arc-shaped plate do not interfere with the outside of the connector clamping ring.

The inner cavity of the steel pipe clamping ring is a semi-cylindrical cavity, the outer wall of the steel pipe clamping ring is step-shaped, and the height of the outer wall of the steel pipe clamping ring close to the connector clamping ring is lower than that of the outer wall of the steel pipe clamping ring far away from the connector clamping ring.

The number of the first hinge points is two, and a connecting line L1 of the first hinge points is positioned at the lower part of the circle center of the circle where the longitudinal section of the connector clamping ring is positioned; the two hinge points II are arranged, and a connecting line L2 of the two hinge points II is positioned at the lower part of the center of the circle where the longitudinal section of the steel pipe clamp ring is positioned; the third hinge points are two, and a third connecting line L3 of the two hinge points is positioned at the upper part of a first connecting line L1 of the two hinge points; in the working process, the steel pipe clamping ring always rides on the outer circle of the steel pipe during working, and is not easy to overturn.

In the use, pin joint one is less than pin joint two all the time, along with pin joint three around pin joint one horizontal hunting, pin joint two is along horizontal round trip movement.

The convex rib is located in the middle of the inner wall of the connector clamping ring, and the inner walls of the connector clamping ring on the two sides of the convex rib are attached to the outer circles of the connectors on the two sides of the annular groove in the middle of the connector.

The convex ribs clamp the annular grooves of the joints, and the stress can not be influenced by outdoor wind sand. The steel pipe clamping ring is arranged on the outer circle of the steel pipe and can stretch out and draw back the sliding block to clamp the outer circle of the steel pipe, a certain gap is reserved between the sliding block and the outer surface of the outer circle of the steel pipe, and the steel pipe clamping ring rides on the outer circle of the steel pipe. The utility model can be normally used in wild environments such as wind, sunshine, soil, weeds and the like in barren mountains and wild mountains.

The utility model is designed by combining the characteristics of the grooved steel pipe (steel pipe for short) and the joint, and the inclined pulling push/pull steel pipe clamping ring is more pushed/pulled and more tightened in the connecting and inserting/pulling process of the grooved steel pipe and the joint, so that the steel pipe clamping ring is tightly attached to the steel pipe and is not separated from the steel pipe in the connecting and inserting process, and the working efficiency and the operation safety are improved. When the device is used, after the clamping wrench is pulled to clamp a steel pipe, the wrench is manually pulled, the first rotating pin shaft rotates along the inner hole of the connector clamping ring fixing sleeve of the lever wrench main clamping device, and the third rotating pin shaft drives the two connecting plates to push and pull the driven clamping device to move, so that the connection insertion/extraction of the groove steel pipe and the joint is realized. Under the condition that no groove steel pipe inserting tool is arranged, the groove steel pipe assembling and disassembling operation can be completed, the operation tool is prevented from being replaced in the groove steel pipe assembling and disassembling process, and the operation efficiency is high.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a perspective view of the present invention;

FIG. 4 is a partial cross-sectional view of FIG. 2;

FIG. 5 is an enlarged view of a portion of FIG. 4;

FIG. 6 is one of the use states of the present invention (without a sleeve, usable directly as an insertion tool);

FIG. 7 is a second state of use of the present invention (with a sleeve);

FIG. 8 is one of the steel pipe dismantling processes;

FIG. 9 is a second process of disassembling the steel pipes;

FIG. 10 is a schematic view of the construction of the sleeve;

FIG. 11 is a schematic view of the opening of the two halves of the sleeve;

fig. 12 is a top view of the sleeve.

Detailed Description

In fig. 1-5, the present invention is used for loading and unloading a grooved steel pipe 1, and the grooved steel pipe 1 is simply referred to as a steel pipe. The steel locking ring 21 in the coupling 2 is expanded by means of a collet, the steel tube 1 is then manually clamped and finally the steel tube 1 is pulled out. The utility model comprises a connector clamping ring 101, two connecting plates 104, a steel tube clamping ring 107, a wrench 110 and a clamping wrench 41. The connector collar 101 is T-shaped in cross-section. The first rotating pin shaft 103 is sleeved in the connector snap ring fixing sleeve 108. The third rotating pin 106 is sleeved with the connecting plate 104.

The wrench 110 comprises a lever, a handle is arranged at the upper end of the lever, the lower end of the lever is connected with a semi-arc plate III through a reinforcing plate 1102, the semi-arc plate III forms an arc-shaped opening, the upper part of the arc-shaped opening is a first arc bottom, and the lower part of the arc-shaped opening is a first arc opening.

The connector snap ring 101 and the connector snap ring fixing sleeve fixed integrally on two sides of the connector snap ring 101 form a main clamping device. The first rotating pin shaft 103 is fixed at two ends of the three openings of the semi-arc plate at the lower part of the wrench 110. The axes of the two rotating pin shafts I103 are overlapped, and the rotating pin shafts I103 are sleeved in the inner hole of the connector snap ring fixing sleeve and can rotate along the inner hole of the connector snap ring fixing sleeve. And a third rotating pin shaft 106 is fixedly welded on two sides of the third semi-arc plate which is away from the two ends of the arc opening at the lower part of the wrench 110 by a certain distance, and the axes of the two third rotating pin shafts 106 are superposed. The wrench 110 swings along the center of the first rotating pin shaft 103 and the center of the connector snap ring fixing sleeve, the position of the connector snap ring fixing sleeve is fixed, the first rotating pin shaft 103 rotates relatively, and under the action of the connector snap ring fixing sleeve 108, the wrench 110 and the first rotating pin shaft 103 are limited to swing only along the center of the fixing sleeve in the swinging process.

The steel pipe snap ring 107 and the clamping wrench 41 constitute a slave. The steel tube snap ring 107 is provided with a telescopic slide block for clamping the excircle of the steel tube 1. Scalable slider is including pressing from both sides tight piece 401, being fixed in bolt, the telescopic shaft on pressing from both sides tight piece 401, presss from both sides the outer flat square head of flat hole and telescopic shaft outer end in the tight spanner 41 and is connected, and the telescopic shaft middle part passes the axle sleeve 102 of radial trompil department, and axle sleeve 102 hole is for being connected with telescopic shaft tip stub portion complex step hole, the telescopic shaft inner with bolt threaded connection, the telescopic shaft is including interior in inner removal axle 402, the rotation axis 403 that is located the outer end, and the thin axle portion one of rotation axis 403 outer end stretches out from axle sleeve 102 hole outer end, is located axle sleeve 102 hole outer thin axle portion one and is connected with clamping spanner 41, is located axle sleeve 102 hole inner removal axle 402 inner and is thin axle portion two, and thin axle portion two upper sets compression spring, thin axle portion two tip and bolt fixed connection. The rotation of the wrench 41 rotates the rotating shaft 403, the rotating shaft 403 and the moving shaft 402 are engaged with each other via the spiral inclined surface, the rotating shaft 403 rotates, and the moving shaft 402 moves in the axial direction.

One end of each of the two connecting plates 104 is sleeved on the end of the rotating pin shaft III 106, and the other end of each of the two connecting plates 104 is sleeved on the shaft sleeve 102.

In fig. 6 and 7, during operation, the convex rib 1011 of the connector snap ring 101 is matched with the annular groove 22 at the middle of the excircle of the joint 2, and the steel pipe snap ring 107 rides on the excircle of the grooved steel pipe 1. The wrench 110 is manually operated, the first rotating pin 103 rotates along the inner hole of the connector snap ring fixing sleeve 108 of the lever wrench main clamping device, and the third rotating pin 106 drives the two connecting plates 104 to push and pull the slave clamping device to move.

When the steel pipe is clamped, the clamping wrench 41 is pulled by hand, the rotating shaft 403 rotates, so that the moving shaft 402 is driven to move axially, and the clamping block 401 is pushed to clamp the steel pipe.

The utility model is divided into inserting and pulling in the using process. Firstly, the front end conical surface of the sleeve 6 extends into an annular gap between the mounting hole of the joint 2 and the outer diameter of the groove head 11 of the groove steel pipe 1, and in the process of inserting the sleeve into the annular gap, when a lever is pulled, the sleeve is inserted, the main stress surface is an attaching surface of the right side of the convex rib 1011 of the connector snap ring, which abuts against the groove wall on the right side of the annular groove 22, and the reaction force of the tension of the chain in the inserting process is borne; the right side of the inner wall of the connector snap ring is tightly attached to the outer circle of the right side of the joint 2 to bear the rotating torque in the inserting process. After the sleeve is inserted in place, the inner diameter of the steel locking ring is expanded, after the locking of the steel pipe 1 is released, the nut is rotated by a general tool and clamped by the steel pipe with the telescopic sliding block, and then the steel pipe 1 is pulled out by a pulling tool. In the stress state in the pulling-out process, the main stress surface is the left groove wall of the annular groove 22 on the left side of the convex rib 1011.

In fig. 8 and 9, the sleeve 6 is a cylindrical structure composed of two semicircular arc plates 606, and a working head is arranged at the front end of the sleeve 6. Two half arc boards of sleeve 6 ride on 1 excircle of steel pipe, close into a whole circle, and 6 front end operation heads of sleeve stretch into and connect 2 mounting holes and the annular clearance between 1 groove head 11 external diameters of slot steel pipe, and left slot steel pipe assembly moves to the right and holds joint 2 circular bead 26 to the face of groove head end, and left slot steel pipe assembly comprises slot steel pipe 1, overlaps groove head snap ring 23 in 1 groove head 11 of slot steel pipe. The wrench 110 of the utility model is pulled leftwards, the sleeve 6 is pushed by the clamping device to move rightwards continuously until the inner diameter of the steel locking ring 21 expands to the outer circle of the groove head clamping ring 23, the handle of the wrench 110 is forced to move to the maximum limit continuously, the hexagonal nut 105 is rotated to enable the slider body 112 to clamp the steel pipe 1, the handle of the wrench 110 is forced rightwards, the left groove steel pipe assembly moves leftwards, the inner diameter of the steel locking ring 21 is furled along the outer circle inclined plane of the groove head clamping ring 23 under the elastic action, the inner lip 302 of the lip edge 303 of the sealing rubber ring begins to separate from the outer circle of the groove steel pipe, the inner convex circular platform 301 which moves leftwards continuously until the inner diameter of the sealing rubber ring contacts the groove head end face of the assembly, and then the inner lip 302 of the lip edge 303 of the sealing rubber ring moves leftwards (as shown in figure 9) to completely separate from the outer circle of the groove head clamping ring, the inner diameter of the steel locking ring 21 is folded from the inclined plane of the excircle to the excircle of the groove steel pipe under the elastic action, and then the steel locking ring moves leftwards continuously, so that the left groove steel pipe assembly is completely separated from the joint 2.

In fig. 10, 11, and 12, the outer side of the front end of the sleeve has a chamfered portion 6061, the inner side of the front end of the sleeve has a rounded portion 6062, the chamfered portion 6061 and the rounded portion 6062 form a circle of the working head, and the angle of inclination of the chamfered portion is about 37 °. The outer wall of the sleeve is a cylindrical surface, the inner wall of the sleeve is a step shape with a thin front part and a thick rear part, the sleeve is formed by butt joint of two semi-circular arc plates 606, the upper parts of the two semi-circular arc plates 606 are connected through a sleeve connecting assembly, the lower parts of the two semi-circular arc plates 6 are provided with a tooth part and a tooth socket which are meshed with each other, and hinge holes are formed in the lower parts of the side walls of the two semi-circular arc plates 606 which pass through the center. The handle 601 is a semi-circular arc rod-shaped structure and is formed by butt joint of two half arc rods 604, the upper parts of the two half arc rods 604 are hinged through a sleeve pin 602, the lower parts of the two half arc rods 604 are hinged with the outer end of a connecting rod 607, and the inner end of the connecting rod 607 is hinged to the middle part of a hinge hole. The middle parts of the upper ends of the two semi-circular arc plates 606 are provided with grooves; the connecting assembly comprises a connecting block 603 and a sleeve pin shaft 605, one end of the connecting block 603 is arranged in a groove of one half of the circular arc plate 606, and the other end of the connecting block 603 is arranged in a groove of the other half of the circular arc plate 606. When the lifting handle is used, the lifting handle 601 is lifted, and the two semicircular arc plates 606 are opened.

Claims (8)

1. The utility model provides a ditch channel steel pipe loading and unloading are with two lever spanner which characterized in that: the method comprises the following steps:

the wrench (110) comprises a lever, a handle is arranged at the upper end of the lever, a third semi-arc plate is arranged at the lower end of the lever, the third semi-arc plate forms an arc opening, the upper part of the arc opening is a first arc bottom, and the lower part of the arc opening is a first arc opening;

the main clamping device comprises a connector clamping ring (101), the connector clamping ring (101) is made of a semicircular arc plate I, and a convex rib (1011) matched with an annular groove (22) in the middle of the excircle of the joint (2) is arranged on the inner wall of the connector clamping ring (101);

the secondary clamping device comprises a steel pipe clamping ring (107), the steel pipe clamping ring (107) is made of a second semicircular arc plate, the upper part of the steel pipe clamping ring (107) is provided with a second arc bottom, and the lower part of the steel pipe clamping ring (107) is provided with a second arc opening; the steel pipe clamping ring (107) is provided with a telescopic sliding block for clamping the excircle of the steel pipe (1), and the slave clamping device further comprises a clamping wrench (41) for driving the telescopic sliding block to stretch;

the two connecting plates (104) are symmetrically arranged on the two sides of the first arc opening of the third semi-arc plate and the second arc opening of the steel pipe clamping ring (107); the semi-arc plate III and the steel pipe clamp ring (107) are arranged along the length direction I of the connecting plate (104) from left to right;

the two ends of the connector clamping ring (101) are hinged with the two ends of an arc opening of the arc opening at the lower end of the lever to form a first hinge point, one ends of the two connecting plates (104) are hinged with the two sides of the three outer walls of the semi-arc plate at the upper part of the arc opening to form a third hinge point, the three positions of the hinge point are located at the upper part of the first hinge point, and the other ends of the two connecting plates (104) are hinged to the outer walls at the two ends of the steel pipe clamping ring (107) to form a second hinge point.

2. The double lever wrench for loading and unloading a grooved steel pipe according to claim 1, wherein: the two telescopic sliding blocks are movably and symmetrically arranged at the radial hole on the steel pipe clamping ring (107); the second hinge point is provided with two parts, and each second hinge point is provided with a telescopic sliding block.

3. The double lever wrench for loading and unloading a grooved steel pipe according to claim 2, wherein: the clamping device comprises a clamping block (401), a bolt and a telescopic shaft, wherein the bolt and the telescopic shaft are fixed on the clamping block (401), an inner flat hole of a clamping wrench (41) is connected with an outer flat square head at the outer end of the telescopic shaft, the middle part of the telescopic shaft penetrates through a shaft sleeve (102) at a radial opening, an inner hole of the shaft sleeve (102) is a stepped hole matched with the large end part of the telescopic shaft, and the inner end of the telescopic shaft is in threaded connection with the bolt; the telescopic shaft comprises a moving shaft (402) positioned at the inner end and a rotating shaft (403) positioned at the outer end, and the rotating shaft (403) is matched with the moving shaft (402) through a spiral inclined plane; a first thin shaft part at the outer end of the rotating shaft (403) extends out of the outer end of an inner hole of the shaft sleeve (102), a first thin shaft part positioned outside the inner hole of the shaft sleeve (102) is connected with the clamping wrench (41), a second thin shaft part is positioned at the inner end of the moving shaft (402) positioned at the inner end of the inner hole of the shaft sleeve (102), a compression spring is sleeved on the second thin shaft part, and the end parts of the second thin shaft part are fixedly connected with the bolt.

4. The double lever wrench for loading and unloading a grooved steel pipe according to claim 1, wherein: two ends of the semi-arc plate III are provided with a rotating pin shaft III (106), two ends of the steel pipe clamping ring (107) are fixed with the shaft sleeve (102), one end of each of the two connecting plates (104) is sleeved on the rotating pin shaft III (106) to form a hinge point III, and the other end of each of the two connecting plates (104) is sleeved on the shaft sleeve (102) to form a hinge point II.

5. The double lever wrench for loading and unloading a grooved steel pipe according to claim 1, wherein: when in use: the connector snap ring is fixed relative to the joint (2), when the wrench (110) swings along the first hinge point, the steel pipe snap ring (107) moves back and forth relative to the connector snap ring (101) through the driving of the connecting plate (104), and the connector snap ring (101) is located in the movement track of the three inner walls of the semi-arc plate.

6. The double lever wrench for loading and unloading a grooved steel pipe according to claim 1, wherein: the inner cavity of the steel pipe clamping ring (107) is a semi-cylindrical cavity, the outer wall of the steel pipe clamping ring (107) is in a step shape, and the height of the outer wall of the steel pipe clamping ring (107) close to the connector clamping ring (101) is lower than that of the outer wall of the steel pipe clamping ring (107) far away from the connector clamping ring (101).

7. The double lever wrench for loading and unloading a grooved steel pipe according to claim 1, wherein: the number of the first hinge points is two, and a connecting line L1 of the first hinge points is positioned at the lower part of the circle center of the circle where the longitudinal section of the connector snap ring (101) is positioned; the two hinge points are two, and a connecting line L2 of the two hinge points is positioned at the lower part of the center of a circle where the longitudinal section of the steel pipe clamping ring (107) is positioned; the third hinge points are two, and a third connecting line L3 of the two hinge points is positioned at the upper part of a first connecting line L1 of the two hinge points; in the use, pin joint one is less than pin joint two all the time.

8. The double lever wrench for loading and unloading a grooved steel pipe according to claim 1, wherein: the convex rib (1011) is located connector snap ring (101) inner wall intermediate position, and connector snap ring (101) inner wall and the excircle laminating that connects of joint (2) middle part annular groove (22) both sides of convex rib (1011) both sides are connected.

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