Cement Lining slinger head tachometer assembly

A cement lining slinger head tachometer device to detect and display the speed of rotation of a slinger head when lining the inner surface of a pipe with cement including a cement supply to feed cement from an external source to the slinger head, a slinger head drive to rotate the slinger head and a system control to monitor and display the rotational speed of the slinger head.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
A cement lining slinger head tachometer device to detect and display the 
speed of rotation of a slinger head when lining the inner surface of a 
pipe with cement. 
2. Description of the Prior Art 
A cement lining is added to the inside surface of iron pipe to protect the 
iron and to improve the flow characteristics of the pipe. 
Problems arise when the slinger head does not spin at the proper speed 
necessary to evenly and uniformly apply the cement mixture. This can be 
due to wear over the course of normal use or improper adjustment. 
U.S. Pat. No. 4,502,853 discloses a rotational speed sensor for sensing the 
rotational speed of an aluminum alloy rotor having a permanent magnet 
embedded therein. 
U.S. Pat. No. 4,361,288 teaches a rotating speed detecting device 
comprising an annular permanent magnet attached to the rotary shaft of a 
spray painting device and a detecting head mounted on the housing of the 
spray painting device to measure the speed of rotation of the rotary 
shaft. 
JP 62-25267 relates to a magnetic signal generator ring comprising a resin 
magnet embedded in the outer peripheral surface of the ring fabricated of 
synthetic resin to form the magnetic signal generator ring. 
U.S. Pat. No. 5,697,559 shows a rotary atomizer including a speed sensing 
system mounted in the atomizer housing utilizing both magnetics and optics 
for accurately measuring the rotational speed of the air turbine motor in 
the presence of high electrostatic charge and RF fields from an internal 
power supply. 
U.S. Pat. No. 4,936,507 shows a speed monitoring device for the rotary 
atomizer. A pair of permanent magnets are mounted at diametrically opposed 
locations on the turbine wheel. Although one magnet is sufficient to 
generate a speed signal, two or more magnets are typically utilized to 
maintain the balance of the turbine wheel. A pickup coil including a 
magnetic core is located adjacent the path of the magnet. The ends of the 
pickup coil are connected to opposite ends of a single loop of 
dielectrically insulated high voltage wire in a series loop. The high 
voltage wire extends through an aperture formed in the end cover and 
through the aperture formed in the manifold body. Each time one of the 
magnets passes the pickup coil, an electrical pulse is generated in the 
coil and conducted through the high voltage wire. The pulse is inductively 
coupled to the torodial coil and sensed by the speed monitoring device. 
U.S. Pat. No. 3,719,168 comprises a system for dispensing and applying a 
uniform layer of liquid or flowable material. The system includes a 
distributor unit from which droplets of the material can be propelled by 
centrifugal force, and means are provided for spinning the distributor 
unit at relatively high rpms. The distributor unit includes a cylindrical 
chamber into which flowable material is received for distribution 
therefrom and the cylindrical chamber includes annular channels associated 
with spaced rows of openings which penetrate the wall of the cylindrical 
chamber. The system is especially useful for coating lining compounds or 
interior surfaces of pipes. 
U.S. Pat. No. 4,499,118 shows a method of applying a coating of atomizable 
material to the inside surface of a glass tube comprising positioning a 
rotatable member within the tube, delivering the material to a surface of 
the member adapted to receive the material, and rotating the member at a 
predetermined velocity to atomize the material and impact the surface of 
the tube with at least a portion of the atomized material. A potential 
difference may be established between the atomized material and the 
surface of the tube to improve coating efficiency. The surface of the tube 
may be maintained at an electrical potential, and multiple coatings may be 
produced. 
U.S. Pat. No. 5,141,774 discloses an apparatus for coating the inner wall 
or surface of hollow objects utilizing centrifugal force to apply fluid to 
the object. A probe is moved from underneath the object thereby utilizing 
gravitational forces to prevent spillage of the material from the probe. A 
computer controls the pumping rate, the vertical movement of the probe and 
the rotational speed of the probe to allow the machine to precisely coat a 
band on the internal cavity of an article. 
U.S. Pat. No. 3,327,681 is directed to a improved boom mounting and rotary 
head for application of uniform coating of epoxy resins paints or other 
suitable coating material to tubular members. A rotary head drive and 
control unit are secured to the forward end of a stabilizing unit. The 
boom serves as a conduit for air lines, hydraulic and electrical control 
lines as well as the line for carrying the coating material to the rotary 
head. The various controls are mounted within the rotary head drive and 
control unit including a constant torque variable speed hydraulic motor 
which is coupled to drive the rotary head unit provided on the forward end 
of the drive and control unit. The speed of the motor is regulated through 
a flow control valve which is mounted on the hydraulic power unit located 
adjacent to the machine. 
FR 2 305 245 shows an apparatus to apply enamel to the internal tube wall 
by a projector operating during the extrusion process. The projector is a 
variable speed rotary disc on the mandrel to which the enamel is 
delivered. 
The present invention is directed to the device used to deliver the lining 
or coating of cement to the interior of the pipe. As a length of iron pipe 
moves through the foundry line, a slinger head is positioned in the pipe 
to deliver the cement. The slinger head is hollow with openings through 
which the cement is forced under centrifugal force. An air source is used 
to spin the slinger head as it moves the length of the pipe spraying 
cement on the prior pipe wall. 
SUMMARY OF THE INVENTION 
The present invention relates to a cement slinger head tachometer device 
comprising a sensor means and a system control means for use with a 
slinger head assembly to line or coat the interior surface of a pipe with 
cement. 
The slinger head assembly comprises a cement supply conduit having a feed 
passage formed therethrough coupled to a source of cement and a slinger 
head to receive cement from the cement supply conduit for distribution to 
the interior surface of the pipe. 
The slinger head comprises an interior cement conduit having a slinger 
passage formed therethrough terminating in a plurality of feed orifices in 
fluid communication with a feed chamber and a plurality of feed apertures 
to distribute cement to the interior surface of the pipe through the 
plurality of feed apertures. 
A slinger head drive means comprising a turbine housing to operatively 
house a turbine is coupled to the slinger head to rotate the slinger head 
and in fluid communication with an air source through an air supply means 
to power the turbine. 
The sensor means comprises a first sensor element including means to 
generate a signal when energized attached to the slinger head coupled to 
the system control means and a second sensor element including means to 
energize the first sensor element when in proximity thereto affixed to the 
turbine housing. 
The system control means includes means to convert signals received from 
the first sensor element into a visual display representative of the speed 
of rotation or revolutions per minute of the second sensor element and the 
slinger head relative to the first sensor element. 
In operation, the slinger head assembly with the turbine and slinger head 
rotating at the predetermined rotational speed is advanced into and 
withdrawn from the pipe coating the interior surface of pipe with cement 
fed from the source of cement (not shown) through slinger head assembly 
out the feed apertures by centrifugal force. 
As previously discussed, the system control means will monitor the 
rotational speed of turbine and slinger head to maintain and control the 
rotational speed of the turbine and slinger head at the predetermined 
speed through the feedback loop as well as provide a visual display on 
display. 
The invention accordingly comprises the features of construction, 
combination of elements, and arrangement of parts which will be 
exemplified in the construction hereinafter set forth, and the scope of 
the invention will be indicated in the claims.

Similar reference characters refer to similar parts throughout the several 
views of the drawings. 
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
The present invention relates to a cement slinger head tachometer device 
comprising a sensor means generally indicated as 10 in FIG. 3 and a system 
control means generally indicated as 12 in FIG. 8 for use with a slinger 
head assembly generally indicated as 14 in FIGS. 1 and 2 to line or coat 
the interior surface 16 of a pipe 18 with cement 20. 
As shown in FIGS. 1 and 2, the slinger head assembly 14 comprises a cement 
supply conduit generally indicated as 22 having a feed passage 24 formed 
therethrough coupled to a source of cement (not shown) by a cement supply 
conduit coupler 26 and a slinger head generally indicated as 28. 
As best shown in FIG. 2, the cement supply conduit 22 comprises an inner 
supply conduit section 30 attached in sealed relationship relative to the 
cement supply conduit coupler 26 by a seal 32, an intermediate supply 
conduit section 34 configured to operatively support a slinger head drive 
means generally indicated as 36 and the sensor means 10 as described more 
fully hereinafter, and an outer supply conduit section 38 to distribute 
the cement 20 to the interior surface 16 of the pipe 18 as more fully 
described hereinafter. 
As shown in FIGS. 1 and 2, the slinger head 28 comprises an interior cement 
conduit 40 having a slinger passage 42 formed therethrough terminating in 
a plurality of feed orifices each indicated as 44 formed in the side wall 
of the interior cement conduit 40 in fluid communication with a feed 
chamber 46 formed between an inner and outer end plate or member 48 and 50 
respectively and a feed chamber plate 52 having a plurality of feed 
apertures each indicated as 54 formed therethrough. A cement directional 
control member or cone shaped element 56 is disposed in the outer end 
portion of the slinger passage 42 to direct the cement 20 through the 
plurality of feed orifices 44 to the feed chamber 46 for distribution to 
the interior surface 16 of the pipe 18 through the plurality of feed 
apertures 54. 
As shown in FIGS. 1 and 2, the slinger head drive means 36 comprises a 
turbine housing generally indicated as 58 to operatively house a turbine 
generally indicated as 60 therein coupled to the inner end plates or 
members 48 of the slinger head 28 and in fluid communication with an air 
source (not shown) through an air supply means generally indicated as 62. 
The turbine housing 58 comprises a substantially cylindrical housing 
member 64 affixed to the intermediate supply conduit section 34 of the 
cement supply conduit 22 by a flange 66 and a bolt 68 or other suitable 
fastening means and having an inner bearing groove 70 formed on the inner 
end portion thereof and a turbine blade groove or recess 72 formed on the 
outer end portion thereof to operatively house an inner bearing 74 therein 
and a plurality of turbine blades each indicated as 76, a substantially 
cylindrical intermediate housing plate or member 78 including an outer 
bearing recess means 80 formed in the outer surface thereof to operatively 
house an outer bearing 82 therein a substantially cylindrical outer 
housing plate 84 and a sensor bracket 86 including a first sensor element 
recess 88 and a second sensor element recess 90 to operatively house the 
sensor means 10 as described hereinafter and a conductor passage 92 formed 
therethrough to receive a sensor conductor 94 as described more fully 
hereinafter are affixed to the outer end portion of the substantially 
cylindrical housing member 64 by a bolt 96 or other suitable fastening 
means. A turbine housing extension 98 extends forward to be affixed to the 
inner end plate 48 of the slinger head 28 by a substantially cylindrical 
interconnecting member or coupler 100. 
As shown in FIGS. 1 and 2, the air supply means 62 comprises an air passage 
102 formed in the substantially cylindrical housing member 64 of the 
turbine housing 58 connected to an air source (not shown) by an air house 
104 by an air coupler 106 and a plurality of air apertures each indicated 
as 108 formed in the substantially cylindrical housing member 64 of the 
turbine housing 58 and in open fluid communication with the turbine blade 
groove or recess 72. 
As best shown in FIGS. 2 through 7, the sensor means 10 comprises a first 
sensor element 110 such as a Hall Effect semiconductor disposed within the 
first sensor element recess 88 of the sensor bracket 86 coupled to the 
system control means 12 by the conductor 94 and a second sensor element 
112 such as a ring of nonferrous material having a magnet 114 embedded 
therein affixed to the turbine housing extension 98 of the substantially 
cylindrical housing member 64. As best shown in FIG. 3, an expanded 
magnetic field 116 radiates outward the magnet 114. 
As shown in FIG. 8, the system control means 12 comprises a trigger circuit 
generally indicated as 118 including a trigger 120 such as a 7414 Hex 
Inverter Schmitt Trigger to convert the sensor signals received from the 
first sensor element 110 of the sensor means 10 to a square wave, a 
frequency to voltage converter 122 such as Action Instruments MDL 
7380-0000 to convert the square wave frequency to a corresponding voltage 
valve and a voltage to revolution per minute converter and display 124 
such as an Action Instruments MDL V508-5006 to convert the voltage valve 
to a corresponding revolution per minute and to display the RPM of the 
second sensor element 112 and the slinger head 28 relative to the first 
sensor element 110. 
In addition, the output of the voltage to revolution per minute converter 
and display 124 is fed to a comparator 126 which includes logic means to 
determine whether the rotational speed of the turbine 60 and the slinger 
head 28 is above or below a predetermined valve such as 5000 RPM and to 
generate a control signal in response thereto to increase or decrease air 
pressure from the air source (not shown) to either increase or decrease 
the rotational speed of the turbine 60 and slinger head 28 to the 
predetermined speed such as 5000 RPM. 
The first sensor element 110 is coupled to 110VAC through an AC to DC 
converter generally indicated as 128. Further, the system control means 12 
may include a test circuit generally indicated as 130. 
In operation, the slinger head assembly 14 with the turbine 60 and slinger 
head 28 rotating at the predetermined rotational speed is advanced into 
and withdrawn from the pipe 18 coating the interior surface 16 of pipe 18 
with cement 20 fed from the source of cement (not shown) through slinger 
head assembly 14 out the feed apertures 54 by centrifugal force. 
AS previously discussed, the system control means 20 will monitor the 
rotational speed of turbine 60 and slinger head 28 to maintain and control 
the rotational speed of the turbine 60 and slinger head 28 at the 
predetermined speed through the feedback loop as well as provide a visual 
display on display 124. 
It will thus be seen that the objects set forth above, among those made 
apparent from the preceding description are efficiently attained and since 
certain changes may be made in the above construction without departing 
from the scope of the invention, it is intended that all matter contained 
in the above description or shown in the accompanying drawing shall be 
interpreted as illustrative and not in a limiting sense. 
It is also to be understood that the following claims are intended to cover 
all of the generic and specific features of the invention herein 
described, and all statements of the scope of the invention which, as a 
matter of language, might be said to fall therebetween. 
Now that the invention has been described,