Patent Application
20190210077
The present disclosure is directed to high pressure fluid handling systems. In particular, embodiments of the present disclosure are directed to an apparatus for remotely driving a flexible cleaning lance and/or hose into a piping system to be cleaned.
One conventional tube lancing apparatus is described in US Patent publication No. 2015/0068563 published Mar. 12, 2015. Such a system includes take-up reel for lance hose, a lance feed motor, and a mounting frame fastened to, in this case, a tube sheet of a heat exchanger bundle.
For cleaning a piping system or tube bundle, a user typically will install a back-out preventer and splash shield to the end of the pipe or tube to be cleaned and push a hand held cleaning lance or hose into the piping system to be cleaned. This requires the user to stand relatively close to the back-out preventer, hence in the path of potentially dangerous fluid back flow and debris out of the piping system. In order for a user to get back out of the splash zone an elaborate frame system must be erected to which a flexible lance feed system is installed. What is needed is a simple lightweight apparatus for feeding a single flexible lance and/or hose into a piping system to be cleaned that is quick to set up, is adaptable to a variety of pipe system configurations, and which can be remotely operated from a distanced spaced from the splash zone.
An adaptable flexible lance drive apparatus in accordance with the present disclosure directly addresses such needs. One embodiment of a flexible lance drive apparatus in accordance with the present disclosure includes a winch type pipe clamp assembly for fastening a positioner arm adjacent to and in alignment with an open end of a pipe to be cleaned, a T or L shaped support member having one end selectively attachable to the positioner arm, a back-out preventer collet block adjustably fastenable to a stem of the T or L shaped support member, the collet block having a tractor side portion and a pipe side portion, and a tractor drive fastened to and supported by a tractor side portion of the collet block. These collet block side portions are preferably symmetrically shaped. The tractor drive supports a pneumatic drive motor and a drive gearbox adjacent a drive housing.
A tractor drive roller assembly and an idler roller assembly are carried within the drive housing. The drive roller assembly is fastened to a drive axle extending into the housing from the drive gearbox. The idler roller assembly is adjustably supported parallel to the drive axle supporting the drive roller assembly by an idler shaft within the housing mounted on a slidable idler shaft slide plate. The idler shaft extends parallel to the drive axle, out of the housing, through a vertical slot in the housing and through a horizontally slidable eccentric plate. An eccentric bushing is rotatably carried in the eccentric plate. This eccentric bushing is fastened to the idler shaft.
Rotation of the eccentric bushing in a first direction causes the idler shaft to vertically raise the idler roller assembly above the drive roller assembly so that a flexible lance hose may be installed or removed from between the roller assemblies. Rotation of the eccentric bushing in an opposite direction causes the idler shaft to vertically lower the idler roller assembly into contact with the drive roller assembly thereby capturing the flexible lance hose therebetween.
The slidable idler shaft slide plate is vertically guided in its movement by a pair of vertical guides formed in or fastened to the housing side plate alongside the vertical slot. The eccentric plate is guided in its movement in a horizontal direction by a horizontal guide on an exterior surface of the tractor housing. A radial handle is attached to the eccentric for manually rotating the eccentric in the first direction and the opposite direction.
The positioner arm is an L shaped member having a short leg fastened to the winch clamp assembly and a long leg adapted to extend along an axis of the pipe to be cleaned. The long leg of the positioner arm fits within an end of the T or L shaped support member and includes a cross bore for receiving a removable pin through the support member and the long leg of the positioner arm to position the stem of the T or L shaped support member spaced from the end of the pipe to be cleaned.
An exemplary embodiment of the apparatus according to the present disclosure may alternatively be viewed as a tractor drive apparatus for feeding a flexible lance into a pipe to be cleaned that includes a tractor drive housing having a fixed side to which is fastened a pneumatic drive motor and a drive gearbox, a tractor drive roller assembly and an idler roller assembly carried within the drive housing. The drive roller assembly is fastened to a drive axle extending into the housing from the drive gearbox and the idler roller assembly is adjustably supported parallel to the drive axle supporting the drive roller assembly by an idler shaft within the housing mounted on a slidable idler shaft slide plate. The idler shaft extends parallel to the drive axle out of the housing through a vertical slot in the housing and through a horizontally slidable eccentric plate. An eccentric bushing rotatably carried in the eccentric plate is fastened to the idler shaft via a releasable hand bolt. Release of the hand bolt permits rotation of the eccentric bushing. Rotation of the eccentric bushing in a first direction causes the idler shaft to vertically raise the idler roller assembly above the drive roller assembly and rotation of the eccentric bushing in an opposite direction causes the idler shaft to vertically lower the idler roller assembly into contact with the drive roller assembly.
An exemplary embodiment of the present disclosure may be alternatively be viewed as a tractor drive apparatus for feeding a flexible lance into a pipe to be cleaned that includes a tractor drive housing having a fixed side to which is fastened a pneumatic drive motor and a drive gearbox, and a tractor drive roller assembly and an idler roller assembly carried within the drive housing. Each of the drive and idler roller assemblies includes a spline hub, a spline gear and a spline roller. The spline gear and roller are removably fastened to the spline hub. The drive roller assembly is fastened to a drive axle extending into the housing from the drive gearbox and the idler roller assembly is adjustably supported parallel to the drive axle supporting the drive roller assembly by an idler shaft within the housing mounted on a slidable idler shaft slide plate. The idler shaft extends parallel to the drive axle out of the housing through a vertical slot in the housing and through a horizontally slidable eccentric plate, and an eccentric bushing rotatably carried in the eccentric plate fastened to the idler shaft to a hand bolt. When the hand bolt is loosened, rotation of the eccentric bushing in a first direction causes the idler shaft to vertically raise the idler roller assembly above the drive roller assembly and rotation of the eccentric bushing in an opposite direction causes the idler shaft to vertically lower the idler roller assembly into contact with the drive roller assembly. The slidable idler shaft slide plate is vertically guided by a pair of vertical guides alongside the vertical slot and the eccentric plate is guided along a horizontal guide on an exterior surface of the tractor housing.
Further features, advantages and characteristics of the embodiments of this disclosure will be apparent from reading the following detailed description when taken in conjunction with the drawing figures.
An exemplary apparatus 100 in accordance with the present disclosure is shown in a left perspective view in
The winch pipe clamp assembly 120 has a V block weldment 122 that includes first and second V plates 124 spaced apart by two roller bars 126, preferably with a welded web inbetween the plates 124 and bars 126. A webbing strap 128 has one end fastened via a metal “J” plate 130 to one of the roller bars 126. The other end of the strap 128 passes over the other roller bar 126 and onto the axle 132 of a ratchet tie down winch 134 bolted to the V block weldment 122.
A hinged tube clamp 136 is bolted to a one of the V block weldment plates 124. This tube clamp 136 receives and adjustably fastens one leg 138 of an L shaped positioner arm 140 to the winch pipe V block weldment 122. The L shaped positioner arm 140 is positioned in the clamp 136 such that the other leg 142 of the positioner arm 140 is aligned preferably parallel to or at an off axis angle and spaced from the central axis of the pipe 104. The winch pipe clamp assembly 120 is light weight and can be removed quickly and reattached to a different pipe 104 to be cleaned with minimal difficulty.
A tractor support member 144 is adjustably fastened to the leg 142 of the positioner arm 140. This tractor support member 144 may be a T shaped welded tube having a stem 146 joining a top tube 148 that adjustably slips over the leg 142 of the positioner arm 140 and can be secured at selectable hole locations 150 via a removable pin 152. Fastening the stem 146 of the tractor support member 144 to the tractor 106 is another tube clamp 136 bolted to the back-out preventer collet block 108.
The back-out preventer collet block 108 is a solid metal body, preferably made of aluminum, with a central passage through a tractor side portion 162, a collet receiving portion 164 and a tube side portion 166. The tractor and tube side portions 162 and 166 of the block 108 are half round and preferably symmetrically shaped. A C shaped tractor side half round cap 168 is bolted to the tractor side portion to capture an outlet fitting 170 (See
The splash guard 176 may be a circular plate 178 with the central tube 174 captured in the tube side portion 166 of the collet block 108 that faces the flange 102 of the pipe 104 to be cleaned. Alternately the splash guard 176 may have a different configuration, such as a quarter round plate 180 used to mount the tractor to a bolted flange or other design that helps prevent splash back of cleaning water/fluid and debris out of the pipe being cleaned. The circular plate 178 is thus merely exemplary.
The tractor drive 106, shown separately in
Each of the walls 204, 206, 208, and 210 may be made of a light metal plate material such as aluminum. Optionally other materials could be used such as a steel, stainless steel, structural plastic or fiberglass plate material having the requisite structural strength and rigidity. For example, the fixed side wall 204 may be made of aluminum while the front, rear and clamshell walls could be made of a composite fiber material. The rear wall 208 of the housing 202 supports an entrance stub tube 212. The front wall 206 of the housing 202 supports an exit stub tube fitting 170 that is in turn fastened to the tractor side portion 162 of the collet block 108. Thus in the embodiment 100 shown in
A drive axle gearbox 214 and a fluid drive motor 212 are fastened to the outside of fixed wall 204 of the housing 202. In the illustrated embodiment, the drive motor 212 is a bidirectional pneumatic motor. The drive motor 212 could alternatively be a hydraulic or electrical motor. However, pneumatic motors are usually preferred. The gearbox 214 provides a reduction ratio suitable for the task involved, and may, for example, be 5:1, 10:1 or about 20:1 in order to provide appropriate torque to the drive roller assembly 218 for operation of the apparatus 100 to suitably propel a flexible lance 110 into and out of the pipe 104. The drive roller assembly 218 and an idler roller assembly are separately shown in
An idler roller assembly 220 is slidably carried by the fixed wall 204 in the housing 202 vertically above the drive roller assembly 218. This idler roller assembly 220 may be manually moved vertically up and down as explained in more detail below to capture or release a flexible lance 110 between the roller assemblies 218 and 220.
The drive roller assembly 218 has a drive spline hub 222 that is keyed via keyway 216 onto the gearbox drive axle (extending within the spline hub 222 but not visible in the figures shown) within the housing 202. A spline gear 224 and a spline load roller 226 are sequentially mounted on the drive spline hub 222. The spline hub 222 and a face plate 228 are then fastened to the axle via a bolt 230.
The idler roller assembly 220 has a spline idler hub 232 to which is mounted a spline gear 234 and a spline load roller 236 followed by a face plate and a bolt 230. The spline idler hub 232 is bolted to an idler bearing plate 238 supported by an idler shaft 240 such that the hub 232 together with the bearing plate 238 are free to rotate on bearings on the idler shaft 240. This idler shaft 240 has a rectangular slide plate 242 fastened to it at one end. The other end of the idler shaft 240 carries the bearings, the bearing plate 238 and spline idler hub 232.
The spline hubs 222 and 232 each have an identical external shape, having a disc shaped end wall 244 and 5 equally spaced rounded splines 246 spaced around its cylindrical outer surface. The spline load rollers 226 and 236 and spline gears 224 and 234 have internal shapes complementary to the outer surface shape of the spline hubs 222 and 232. Any number of splines 246 may be provided on the hubs 222 and 232. Hence 5 equally spaced splines are merely exemplary. They are provided so as to preclude slippage of the load rollers and spline gears on the hubs.
The spline load rollers 226 and 236 each have external half round grooves having a radius matched to a particular range of flexible lance 110 hose diameters. For example, for conventional poly lance hose sizes 4/2, 6/2, and 8/4 the diameters are 0.34 in., 0.46 in. and 0.58 in. respectively. Thus a 0.46 in. rollers work for hoses ranging from 0.39 to 0.50 inch O.D.
Turning now to the tractor 106 shown in
The idler roller assembly 220 is fastened to the fixed side wall 204 of the housing 202 through the vertical slot 248 spaced above the drive axle via an eccentric bushing 250 that is bolted to the slide plate 242 on the idler shaft 240 by a hand bolt 256. The hand bolt 256 passes through the eccentric bushing 250, a horizontal slide plate 258, through the vertical slot 248, and into the rectangular slide plate 242 on the end of the idler shaft 240. When the hand bolt 256 is tightened, the idler roller assembly 220 is securely fastened and fixed to the fixed side wall 204 of the housing 202 of the tractor 106. Loosening the hand bolt 256 allows the idler roller assembly 220 to be adjusted vertically.
The eccentric bushing 250 is a cylindrical solid body that has a recessed circular end rotatably carried in the horizontal slide plate 258. The hand bolt 256 passes axially through the eccentric bushing 250 off center such that when the hand bolt 256 is loosened, rotation of the bushing 250 raises the hand bolt 256 in an arc about the center of the eccentric bushing 250. The eccentric bushing 250 has a radially extending handle 260. This handle 260 is used to raise the idler assembly 220 vertically away from the drive roller assembly 218, to a position as shown in
Although rotation of the handle 260 causes the eccentric bushing 250 to rotate in an arc, the hand bolt 256 is constrained to move only vertically away from or toward the drive axle 216. This constrained movement is due to the constrained movement of the slide plate 242 between the vertical guides 254 and constrained movement of the eccentric horizontal slide plate 258 against the horizontal guide 252. The end result is that rotation of the handle 260 causes the hand bolt 256 to move only vertically toward and away from the drive axle 214.
In order to raise the idler roller assembly 220, a user would first loosen the hand bolt 256. Then the user grasps the handle 260 and rotates the handle 260 counterclockwise to disengage the idler roller assembly 220 from the drive roller assembly 218. As the handle 260 rotates, the horizontal slide plate 258 slides to the left, and the slide plate 242 raises up between the internal vertical guides 254 until the hand bolt 256 is at its highest point. At this position the idler roller assembly 220 is fully disengaged from the drive roller assembly 218 and a lance 110 may be inserted or removed from between the rollers 226 and 236. Clockwise rotation of the handle 260 reverses the process and the idler roller assembly 220 is lowered into full contact with the drive roller assembly 218. The hand bolt 256 is then tightened to maintain the idler roller assembly position.
The drive and idler rollers are, for example, preferably about 3.75 inch in diameter and are pressed more or less together depending on traction conditions of the tractor 106 in operation. In some applications, it is best to maximize traction. In others, it is desirable to allow easy slippage. Such reduced traction can reduce hose damage from frictional heat and avoid kinking if the hose is overloaded in compression when it encounters an obstacle. With a looser grip, the apparatus 100 is more free-running and sensitive, which allows for better operator control at light thrust conditions and accommodates the range of hose ODs used.
The radius of the U-shaped cross section of the roller grooves is slightly less than half the hose diameter for a given hose size. For example, first four point contact is made at about 3.90 in. shaft spacing (between drive axle and idler roller shaft 240). The drive and idler roller material is preferably a 95 durometer urethane. Roller deformation progresses as the shaft spacing is reduced to about 3.70 in. The contact pressure and the length of full contact zone on the hose increases to about one hose diameter at this spacing.
A remote console 270 shown in
Many changes may be made to the apparatus above described. For example, the guides 252 and 254 may be strips of material fastened to a flat sheet side wall or may be molded into or stamped into the side wall 204. Alternatively the slide plates 242 and 258 may be formed with ribs that slide in corresponding channels or grooves formed in the side wall 204 during rotation of the eccentric bushing 250. Therefore, all such changes, alternatives and equivalents in accordance with the features and benefits described herein, are within the scope of the present disclosure. Such changes and alternatives may be introduced without departing from the spirit and broad scope of this disclosure as defined by the claims below and their equivalents.
This application is a continuation of U.S. patent application Ser. No. 15/374,585 filed Dec. 9, 2016, the content of which is incorporated by reference herein in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15374585 | Dec 2016 | US |
| Child | 16354700 | US |
