CN111704055A

CN111704055A - Crane base with protective structure

Info

Publication number: CN111704055A
Application number: CN202010649931.XA
Authority: CN
Inventors: 但洁
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2020-09-25

Abstract

The invention discloses a crane base with a protection structure, which comprises a base, a first mounting plate body and a second mounting plate body, and is characterized in that: the utility model discloses a mounting structure, including base, installation cavity, gyro wheel, mounting bracket fixed mounting, second installation plate body, the top fixed mounting of base has the installation cavity, the inside roll of installation cavity has the gyro wheel, the gyro wheel has first installation plate body through mounting bracket fixed mounting, the top of first installation plate body is rotated and is installed the second installation plate body, the bottom fixed mounting of first installation plate body has the installation cover body, the inside rotation of the installation cover body installs the guiding axle of being connected with the second installation plate body. The motor provided by the invention enables the base to be effectively adjusted in a rotating mode according to the operation requirement of the crane through the guide shaft and the first mounting plate body, the base can be pushed and adjusted in a translating mode by the aid of the hydraulic telescopic rod according to the actual requirement of the crane in operation, and the arc-shaped protective sleeve, the threaded rod and the mounting plate enable the base to effectively protect the crane.

Description

Crane base with protective structure

Technical Field

The invention relates to the technical field of cranes, in particular to a crane base with a protective structure.

Background

The crane refers to a multi-action hoisting machine for vertically lifting and horizontally carrying heavy objects within a certain range, and is also called a crown block, a navigation crane and a crane;

the tire crane is mainly characterized in that: the traveling cab and the crane control cab are integrated and are formed by the evolution of a crawler crane (crawler crane), the crawler and the traveling support part of the traveling mechanism are changed into a chassis with tires, the defect that a crawler plate of the crawler crane (crawler crane) damages the road surface is overcome, and the material handling machine belongs to material handling machinery;

the bridge crane is a hoisting device which is transversely erected above workshops, warehouses and material yards for hoisting materials, because two ends of the bridge crane are located on a high cement column or a metal support and are shaped like a bridge, the bridge frame of the bridge crane longitudinally runs along a track laid on the elevated frames at two sides, the space below the bridge frame can be fully utilized for hoisting the materials without being blocked by ground equipment, the bridge crane is a hoisting machine with the widest application range and the largest quantity, and the base is an important component for ensuring the operation of the crane, so that the effect of bearing and mounting is achieved.

Although the prior patent (publication number: CN109027537A) discloses a crane base with a protective structure, which comprises a crane base, wherein a crane underframe is installed at the top end inside the crane base, and a transverse plate is installed inside the crane base at the bottom end of the crane underframe, in the process of implementing the invention, the inventor finds that at least the following problems in the prior art are not solved;

the following drawbacks still exist: 1. the whole structure is relatively fixed, so that the crane cannot be finely adjusted during operation better, the crane needs to be adjusted frequently and repeatedly before operation, and the practical effect of the base is obviously reduced; 2. meanwhile, the operation orientation cannot be quickly adjusted according to actual conditions in a special environment, so that the crane is subjected to more limitations during operation, the operation progress is influenced, and meanwhile, more inconvenience is brought to the operation of workers; 3. moreover, the base is weak in protection performance of the bottom of the crane, so that the crane is caused to operate in a special environment and in a strong wind, the operation quality and stability are reduced, and the practicability of the base is reduced.

Disclosure of Invention

The invention aims to provide a crane base with a protective structure to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a hoist base with protective structure, includes base, first installation plate body and second installation plate body, its characterized in that: the mounting structure comprises a base, a mounting cavity, a roller, a first mounting plate body, a second mounting plate body, a mounting cover body, a guide shaft and a motor, wherein the mounting cavity is fixedly mounted at the top of the base, the roller rolls inside the mounting cavity, the first mounting plate body is fixedly mounted on the roller through a mounting frame, the second mounting plate body is rotatably mounted at the top of the first mounting plate body, the mounting cover body is fixedly mounted at the bottom of the first mounting plate body, the guide shaft connected with the second mounting plate body is rotatably mounted inside the mounting cover body, and the motor is fixedly;

the utility model discloses a mounting plate, including base, first installation plate body, the both sides at second installation plate body top are all fixed mounting have the riser, slidable mounting has the mounting panel on the second installation plate body between the riser, the central point department fixed mounting in the riser outside has the threaded rod of being connected with the mounting panel, the inboard fixed mounting of mounting panel has arc protection casing, the rear side fixed mounting at base top has the fixed plate, the fixed plate is fixed with the installation of first installation plate body through two sets of hydraulic telescoping rod.

Preferably, the output end of the motor is rotatably connected with the guide shaft through a belt pulley mechanism, the belt pulley mechanism is composed of a belt and a wheel disc, the motor and the installation cover body are fixedly installed through a matched seat sleeve, the motor and the belt pulley mechanism are installed in a butt joint mode through a speed reducer, and the guide shaft and the installation cover body are fixedly installed through a bearing seat.

Preferably, a guide rail for matching operation is arranged between the roller and the mounting cavity, and the mounting frame and the first mounting plate body are fixedly mounted through a mounting seat.

Preferably, the top of the first mounting plate body is provided with a first butt joint groove, the first butt joint groove is in butt joint with the second mounting plate body through a butt joint, the bottom of the first butt joint groove is provided with two groups of rolling ways, balls are uniformly distributed between the rolling ways and the butt joint, and the central position of the butt joint penetrates through a guide shaft through a shaft sleeve.

Preferably, the inboard of arc protection sleeve spare is pasted and is had the rubber slipmat, through being connected the external member butt joint installation between mounting panel and the threaded rod, the tip fixed mounting of threaded rod has the supporting adjusting disk who uses.

Preferably, the bottom of the base is fixedly provided with a mounting bottom plate, the bottom of the mounting bottom plate is adhered with a rubber gasket, and the mounting bottom plate is fixedly provided with a positioning bolt which is matched with the mounting bottom plate for use.

Preferably, the hydraulic telescopic rod and the fixing plate are fixedly installed through a base plate, and the hydraulic telescopic rod and the first installation plate are fixedly installed through a fixing seat.

Preferably, the central point department at second installation plate body top is equipped with the mounting groove, all be equipped with the direction slider on the second installation plate body of mounting groove front and back side, and the direction slider passes through spout and mounting panel fixed connection.

Compared with the prior art, the invention has the beneficial effects that: this hoist base with protective structure is for traditional hoist base:

1. the motor arranged in the invention enables the base to be effectively rotated and adjusted according to the operation requirement of the crane through the guide shaft and the first mounting plate body, so that the base can better meet different operation orientations, the limitation of the crane during operation is avoided or reduced, the defects caused by the traditional base are avoided, the operation performance of the base is improved, the base of the base can be kept at the driven wire effect of the crane through the roller by the mounting cavity, the unnecessary power consumption of the base is reduced, the integral strain degree of the base is reduced, the smoothness of the base during adjustment operation is ensured, and the practicability is improved.

2. The hydraulic telescopic rod enables the base to achieve the effect of active adjustment on the crane, and workers can push the base to translate and adjust according to actual requirements during operation, so that the crane achieves a better operation state, and the flexibility of the base is improved.

3. The arc-shaped protective sleeve, the threaded rod and the mounting plate enable the base to effectively protect the crane, so that the crane is stable and firm in operation, the unstable bottom of the crane caused by strong wind weather is avoided or reduced, and the firmness of the bottom of the crane in operation is guaranteed.

Drawings

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

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic front view of the present invention;

FIG. 4 is a schematic top view of the present invention;

FIG. 5 is a first partial schematic of the present invention;

FIG. 6 is a second partial structural view of the present invention;

fig. 7 is a schematic view of the internal structure of the mounting cover of the present invention.

In the figure: 1. a base; 101. mounting a bottom plate; 102. a rubber gasket; 103. a fixing plate; 2. installing a cavity; 201. a guide rail; 3. a first mounting plate; 301. a first docking slot; 302. a raceway; 303. a ball bearing; 304. a mounting seat; 305. a roller; 306. a mounting frame; 4. a second mounting plate body; 401. a chute; 402. a guide slider; 403. mounting grooves; 404. a butt joint; 5. a threaded rod; 501. an adjusting disk; 502. a connecting kit; 6. a vertical plate; 7. an arc-shaped protective sleeve; 8. mounting a plate; 9. installing a cover body; 901. a guide shaft; 902. a belt pulley mechanism; 903. an electric motor; 10. a hydraulic telescopic rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-7, an embodiment of the present invention is shown: a crane base with a protection structure comprises a base 1, a first mounting plate body 3 and a second mounting plate body 4, wherein a mounting cavity body 2 is mounted at the top of the base 1 through a bolt structure, rollers 305 roll in the mounting cavity body 2, the mounting cavity body 2 enables the base to achieve the effect of driven guiding on a crane through the rollers 305, unnecessary power consumption of the base is reduced, the rollers 305 play a role of driven guiding, the guiding effect of the base is further improved, the traditional single-type axial force driving is avoided, the matching between the axial force and the rolling force is realized, meanwhile, the integral strain degree of the base is reduced, the smoothness of the base during adjusting operation is ensured, the practicability is improved, the first mounting plate body 3 is fixedly mounted on the rollers 305 through a mounting frame 306, the mounting frame 306 is connected with the rollers 305 through bearings and shaft rods, and the rollers 305 roll between the mounting frame 306, the first mounting plate body 3 can mount and fix corresponding operation parts, the top of the first mounting plate body 3 is rotatably provided with the second mounting plate body 4, the bottom of the first mounting plate body 3 is fixedly provided with a mounting cover body 9 through a bolt structure, the mounting cover body 9 plays a role of bearing and mounting, corresponding devices are mounted inside, a guide shaft 901 connected with the second mounting plate body 4 is rotatably mounted inside the mounting cover body 9, the guide shaft 901 plays an important transmission effect and guarantees the premise of rotating operation of the second mounting plate body 4, a motor 903 is fixedly mounted in the mounting cover body 9 at one side of the guide shaft 901 through a bolt, the model of the motor 903 can be an R series motor which is a device on the market, the motor 903 is connected with an external control mechanism through a wire, and the selling base can be effectively adjusted in a rotating mode according to the operation requirements of a crane through the guide shaft 901 and the first mounting plate body 3, the crane base can better meet different operation orientations, avoids or reduces the limitation of the crane during operation, avoids the defects caused by the traditional base and improves the operation performance of the base;

the two sides of the top of the second mounting plate body 4 are fixedly provided with vertical plates 6 through bolt structures, the vertical plates 6 are used as important component parts of the base, a mounting plate 8 is slidably mounted on the second mounting plate body 4 between the vertical plates 6, the mounting plate 8 performs sliding operation on the second mounting plate body 4, a threaded rod 5 connected with the mounting plate 8 is fixedly mounted at the central position of the outer side of the vertical plate 6 through a threaded sleeve, the threaded rod 5 is in a penetrating state, an arc-shaped protective sleeve 7 is fixedly welded on the inner side of the mounting plate 8, the arc-shaped protective sleeve 7, the threaded rod 5 and the mounting plate 8 enable the base to effectively perform protective operation on the crane, the crane is stable and firm during operation, unstable conditions of the bottom of the crane caused by strong wind weather are avoided or reduced, the degree of solidness of the bottom of the crane is ensured, and a fixing plate 103 is fixedly mounted on, the fixed plate 103 is as the component structure of base, fixed plate 103 is fixed with the installation of first installation plate body 3 through two sets of hydraulic telescoping rod 10, hydraulic telescoping rod 10 can be connected with external power and hydraulic system through wire and pipe, in order to guarantee that hydraulic telescoping rod 10 carries out normal operation, hydraulic telescoping rod 10 makes the base reach the effect of initiative regulation to the hoist, the staff can promote the translation regulation to the base according to the actual demand when the operation, make the hoist reach better operating condition, the flexibility of base has been improved, hydraulic telescoping rod 10 is the hydraulic actuating element who changes hydraulic energy into mechanical energy, be straight reciprocating motion (or swing motion), its simple structure, high reliability, when realizing reciprocating motion with it, decelerator can be removed from, and there is not the transmission clearance, the motion is steady.

Further, the output end of the motor 903 is rotatably connected with the guide shaft 901 through a belt pulley mechanism 902, the belt pulley mechanism 902 is composed of a belt and a wheel disc, the motor 903 and the installation cover body 9 are fixedly installed through a matched seat sleeve, the motor 903 and the belt pulley mechanism 902 are installed in a transmission mode, the motor 903 is internally provided with a matched speed reducing mechanism, the motor 903 is a speed reducing motor actually, the model can be selected according to the reference mode, and the guide shaft 901 and the installation cover body 9 are fixedly installed through a bearing seat. In the embodiment, belt and rim plate have guaranteed the normal operation of belt pulley mechanism 902, and belt pulley mechanism 902 has played important drive effect, has guaranteed that motor 903 can drive guiding axle 901 and has carried out rotatory operation, and the seat cover can accomodate the installation to motor 903, has guaranteed that motor 903 installs fixedly in the installation cover body 9, has guaranteed that motor 903 can be steady drive guiding axle 901 rotates the operation.

Further, a guide rail 201 for cooperating operation is provided between the roller 305 and the mounting cavity 2, and the mounting frame 306 and the first mounting plate 3 are fixedly mounted through the mounting seat 304. In the embodiment, installation cavity 2 has played the effect of spacing direction to gyro wheel 305 through guided way 201, makes gyro wheel 305 steadily roll in installation cavity 2 stable, avoids appearing the condition of skew, and mount pad 304 has played the effect of accepting the installation, has guaranteed that the installation between mounting bracket 306 and the first installation plate body 3 is fixed, and simultaneously the staff can dismantle the maintenance to it in the later stage.

Further, the top of the first mounting plate body 3 is provided with a first butt groove 301, the first butt groove 301 is butt-jointed with the second mounting plate body 4 through a butt joint 404, the bottom of the first butt groove 301 is provided with two sets of raceways 302, balls 303 are uniformly distributed between the raceways 302 and the butt joint 404, and the central position of the butt joint 404 is penetrated through a guide shaft 901 through a shaft sleeve. In the embodiment, the butt joint operation between the first butt joint groove 301 and the butt joint 404 not only increases the contact area between the first butt joint groove 301 and the butt joint 404, but also ensures the stability of the first installation plate 3 during the rotation operation, avoids the unstable condition of the first installation plate 3 during the rotation, and the combination operation of the roller path 302 and the ball 303 ensures the rotation operation between the first butt joint groove 301 and the butt joint 404, reduces the bearing strength of the guide shaft 901 and the strain of the motor 903, and ensures the smoothness between the first butt joint groove 301 and the butt joint 404.

Further, the rubber non-slip mat is pasted on the inner side of the arc-shaped protective sleeve 7, the mounting plate 8 and the threaded rod 5 are installed in a butt joint mode through a connecting sleeve 502, and the end portion of the threaded rod 5 is fixedly provided with a matching adjusting disc 501. In the embodiment, arc protection sleeve 7 has effectually increased the friction dynamics between arc protection sleeve 7 and the crane bottom through the rubber slipmat, the effectual fastness that has increased between arc protection sleeve 7 and the crane bottom, the clamping nature and the protecting effect of base have been guaranteed, connect external member 502 to play the effect of butt joint installation, when the staff is rotating threaded rod 5, connect external member 502 both guaranteed the promotion operation of threaded rod 5 to mounting panel 8, threaded rod 5's steady rotation has been guaranteed again, adjusting disk 501 makes the staff more convenient and swift when the operation, the consumption of manpower has been reduced, the staff can directly drive threaded rod 5 through rotation adjusting disk 501 and carry out the rotation operation.

Further, a mounting base plate 101 is fixedly mounted at the bottom of the base 1, a rubber gasket 102 is adhered to the bottom of the mounting base plate 101, and a positioning bolt used in cooperation with the mounting base plate 101 is fixedly mounted on the mounting base plate 101. In the embodiment, mounting plate 101 has improved the area of contact between base 1 and the installation face, it is stable firm to make the base install after the installation, the stable operation of hoist has been guaranteed, rubber gasket 102 has improved the friction dynamics between mounting plate 101 and the installation face, the stability of base after the installation has further been increased, after mounting plate 101 is finishing placing and stable, the staff can pass through positioning bolt to installation or welding operation between mounting plate 101 and the installation face, the convenience of staff when the installation operation has been guaranteed, unnecessary loaded down with trivial details has been reduced.

Further, the hydraulic telescopic rod 10 and the fixing plate 103 are fixedly installed through a base plate, and the hydraulic telescopic rod 10 and the first mounting plate body 3 are fixedly installed through a fixing seat. In the embodiment, the backing plate and the fixing base play an important role in carrying and installing, and a worker can install and detach the hydraulic telescopic rod 10 according to actual maintenance requirements, so that the convenience of the worker in operation is guaranteed.

Further, a mounting groove 403 is disposed at the center of the top of the second mounting plate 4, a guiding slider 402 is disposed on the second mounting plate 4 at the front and rear sides of the mounting groove 403, and the guiding slider 402 is fixedly connected to the mounting plate 8 through a sliding groove 401. In the embodiment, mounting groove 403 can be convenient for the staff to carry out drilling installation and welding operation to mounting groove 403 according to the actual installation position of crane bottom, be the structure that each other is for the cooperation operation between guide slider 402 and the spout 401, the effect of stable direction has been played, when mounting panel 8 received threaded rod 5's effect, unilateral fixed connection through threaded rod 5, the unable holistic stability of mounting panel 8 of having guaranteed, the unable better bottom through arc protection casing 7 to the hoist carries out centre gripping and protection operation, so guide slider 402 has played effectual supplementary effect with spout 401.

The working principle is as follows: during operation, firstly, all operation parts on the base are inspected, after the inspection is finished, the base is conveyed to a proper operation position through the mounting bottom plate 101 on the base 1, the operation position is installed and fixed through the positioning bolts on the mounting bottom plate 101, then, the electric appliance wire on the base, the wire to be connected and the parts are in butt joint with a corresponding external mechanism, the bottom of the crane is placed in the butt joint 404 in the second mounting plate body 4, then, the mounting groove 403 is drilled and installed and welded according to the actual mounting position of the base, after the bottom of the crane is installed, a worker rotates the threaded rod 5 through the adjusting disc 501, and the bottom of the crane is clamped and wrapped through the arc-shaped protective sleeve 7 on the mounting plate 8 until the bottom of the crane is stable and firm;

during the operation, if need carry out the translation fine setting to the hoist, then the staff can open hydraulic telescoping rod 10, hydraulic telescoping rod 10 steady promotion hydraulic telescoping rod 3, in the meantime, the gyro wheel 305 of 3 bottom installations of hydraulic telescoping rod also can roll the operation in installation cavity 2 thereupon, until having reached suitable translation distance, the hoist carries out normal work, and during the operation, if need adjust the operation orientation of hoist, then the staff can open motor 903, motor 903 drives guiding axle 901 through belt pulley mechanism 902 and carries out steady rotation, the rotation of guiding axle 901 both drives second installation plate body 4 and rotates the operation, in the meantime, ball 303 carries out steady driven operation, second installation plate body 4 both drives the hoist when the pivoted and rotates the regulation.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a hoist base with protective structure, includes base (1), first installation plate body (3) and second installation plate body (4), its characterized in that: the top of the base (1) is fixedly provided with an installation cavity (2), a roller (305) rolls in the installation cavity (2), the roller (305) is fixedly provided with a first installation plate body (3) through an installation frame (306), the top of the first installation plate body (3) is rotatably provided with a second installation plate body (4), the bottom of the first installation plate body (3) is fixedly provided with an installation cover body (9), the inside of the installation cover body (9) is rotatably provided with a guide shaft (901) connected with the second installation plate body (4), and a motor (903) is fixedly arranged in the installation cover body (9) on one side of the guide shaft (901);

the utility model discloses a mounting plate, including mounting plate body (6), mounting plate (8), central point department fixed mounting in the riser (6) outside has threaded rod (5) of being connected with mounting plate (8), the inboard fixed mounting of mounting plate (8) has arc protection sleeve (7), the rear side fixed mounting at base (1) top has fixed plate (103), fixed plate (103) are fixed with first mounting plate body (3) installation through two sets of hydraulic telescoping rod (10) to both sides fixed mounting at second mounting plate body (4) top, slidable mounting has mounting panel (8) on second mounting plate body (4) between riser (6), the central point department fixed mounting in riser (6) outside.

2. The crane substructure with a protective structure as claimed in claim 1, characterized in that: the output end of the motor (903) is rotatably connected with the guide shaft (901) through a belt pulley mechanism (902), the belt pulley mechanism (902) is composed of a belt and a wheel disc, the motor (903) and the mounting cover body (9) are fixedly installed through a matched seat sleeve, the motor (903) and the belt pulley mechanism (902) are installed in a butt joint mode through a speed reducer, and the guide shaft (901) and the mounting cover body (9) are fixedly installed through a bearing seat.

3. The crane substructure with a protective structure as claimed in claim 1, characterized in that: be equipped with guided way (201) of cooperation operation between gyro wheel (305) and installation cavity (2), it is fixed through mount pad (304) installation between mounting bracket (306) and the first installation plate body (3).

4. The crane substructure with a protective structure as claimed in claim 1, characterized in that: the top of first installation plate body (3) is equipped with first butt joint groove (301), and first butt joint groove (301) through butt joint (404) and second installation plate body (4) butt joint installation, the bottom in first butt joint groove (301) is equipped with two sets of raceways (302), and evenly distributed has ball (303) between raceway (302) and butt joint (404), the central point department of butt joint (404) runs through guiding shaft (901) through the axle sleeve.

5. The crane substructure with a protective structure as claimed in claim 1, characterized in that: the inboard of arc protection sleeve spare (7) is pasted and is had the rubber slipmat, through connecting external member (502) butt joint installation between mounting panel (8) and threaded rod (5), the tip fixed mounting of threaded rod (5) has supporting adjusting disk (501) of using.

6. The crane substructure with a protective structure as claimed in claim 1, characterized in that: the bottom fixed mounting of base (1) has mounting plate (101), and the bottom of mounting plate (101) is pasted and is had rubber gasket (102), the last fixed mounting of mounting plate (101) has supporting positioning bolt who uses.

7. The crane substructure with a protective structure as claimed in claim 1, characterized in that: the hydraulic telescopic rod (10) and the fixing plate (103) are fixedly installed through a base plate, and the hydraulic telescopic rod (10) and the first installation plate body (3) are fixedly installed through a fixing seat.

8. The crane substructure with a protective structure as claimed in claim 1, characterized in that: the middle position department at second installation plate body (4) top is equipped with mounting groove (403), all be equipped with direction slider (402) on second installation plate body (4) of mounting groove (403) front and back side, and direction slider (402) pass through spout (401) and mounting panel (8) fixed connection.