JPS60233491A - Electric signal transfer system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrical signal transfer system for transferring electrical signals from a rotary kiln to a stationary signal receiver.

BACKGROUND OF THE INVENTION Rotary kilns can be used to perform gas/liquid/solid counterflow reactions or coflow reactions. A rotary kiln assembly typically includes a material introduction section, a rotary kiln, and a material discharge section, and the product material can be fed into either the material introduction section or the material discharge section, and
You can take it out from either of them. A seal is provided between the rotary kiln and the material introduction and discharge sections.

Rotary kiln assemblies can operate over a wide temperature range from room temperature to several hundred degrees Celsius. This means that some tolerance must be provided for differences in the coefficient of thermal expansion of the rotary kiln and the material inlet and outlet. Additionally, excessive heating of the rotary kiln must be prevented in order to protect the product material within the rotary kiln and the structural materials of the rotary kiln.

PROBLEM SOLVED BY THE INVENTION One problem with relatively long rotary kilns is the transfer of electrical signals from a sensing device located on the rotary kiln to a fixed receiver, such as a control device. .

Means for Solving the Problems According to the invention, a rotary kiln has a plurality of sensing means and an electrical transfer system for transmitting electrical signals from the sensing means to a fixed receiver, The system includes a plurality of coaxial substantially annular electrically conductive members and a respective electrically conductive contact member disposed for contacting a laterally oriented peripheral surface of each of the annular members. the annular member and the contact member are arranged such that rotation of the rotary kiln causes relative rotation between the annular member and the contact member; and further, the transfer system is arranged in a longitudinal direction of the annular member. Means is provided for longitudinally displacing the contact member in response to the displacement.

Preferably, the annular member is coaxially mounted to the rotary kiln and electrically connected to the sensing means, and the contact member is electrically connectable to a receiver. Resilient means are provided for biasing said contact member towards each annular member.

The means for displacing comprises a ring member coaxial with and longitudinally displaceable with the annular member, and a translation member extending parallel to the axis of the rotary kiln and mounting the contact member; a guide member attached to the translation member, the guide member being arranged relative to the ring member to translate the translation member in response to longitudinal displacement of the ring member.

Preferably, the guide member is offset towards one axial side of the ring member and comprises a fork member having branches around the ring member. Each annular member is comprised of a plurality of sections arranged in a slightly eccentric relationship with respect to each other so as to cause some radially corresponding displacement of the contact member during the relative rotation. Preferably, the eccentric relationship of the sections is such that during said relative rotation in a selected direction, each contact member is displaced radially inwardly.

In one embodiment, the transfer of the electrical signal from the sensing means to the stationary receiver takes place through the action of multiple sets of partial annular members, each contact member contacting each set during each rotation of the rotary kiln. The partial annular members are electrically separated from each other and electrically connected to the respective sensing means.

In this way, during each rotation, an electrical connection is formed between each contact member and the sensing means to which the corresponding partial annular member is connected, so that each contact member
It works to transfer multiple signals per revolution.

Means are provided for detecting at least one predetermined angular position of the rotary kiln with respect to one or more reference positions, and means are provided to detect the output signal obtained from each contact member in relation to the partial annular member providing this output (and thus (sensing means).

The sensing means includes a temperature sensing member. The sensing members are arranged on the rotary kiln such that some of them generate electrical signals related to the temperature of the internal region of the rotary kiln and some of them generate electrical signals related to the temperature of the rotary kiln. Placed.

While the invention may be carried out in many ways, certain specific embodiments are shown in the accompanying drawings and will be described in detail.

Embodiment To explain FIG. 1, a rotary kiln assembly 10 includes a material introduction section 11, a rotary kiln 12, and a material discharge section 1.
3. The material introduction section 11 includes a solid material supply inlet 14 and the material discharge section 13 includes a material outlet 15. Rotary kiln 12 includes a number of temperature controllable sections or zones 17, which are heated by respective external heater sections or zones 18 (shown in FIGS. 4-7) and by convection. Cooler (not shown)
The rotary kiln 12 is cooled by the rotary kiln 12 in order to obtain the desired axial and lateral temperature cross-section.

Seals 19 and 20 are arranged between the rotary kiln 12, the material introduction section 11, and the material discharge section 13, respectively. The rotary kiln assembly 10 is supported on a concrete support 21.22, and the rotary kiln 12 is supported on the support 21.22 by a respective roller mount 24.25; The rotary kiln 12 is held in the axial direction so that it can thermally expand toward the roller mounting portion 25. An electrically energized drive assembly 23 mounted on a support base 21 drives the rotary kiln 1.
2 is arranged to rotate.

The rotary kiln assembly 10 operates over a temperature range from room temperature to several hundred degrees Celsius, and therefore the rotary kiln 12
A certain degree of tolerance shall be provided for thermal expansion of the structural components of the rotary kiln or components within the rotary kiln. The rotary kiln 12 is approximately 10 cm toward the material discharge section 13.
The seal 20 must be able to expand (direction B in FIGS. 1 and 4) and thus allow relative axial movement of the rotary kiln 12. Careful control of the temperature in section 17 is important to protect the product material within the rotary kiln and the structural materials of rotary kiln 12 itself. This requires effective monitoring and evaluation of temperature so that corrective action can be taken quickly, and temperature monitoring is performed using thermocouples 30 placed at selected locations along the rotary kiln 12. By locating these thermocouples 30 (see FIGS. 5 and 7) in the axial center of each section 17 near the outer surface of the rotary kiln and radially inward of the heater 18, A clear image of the temperature profile of the kiln surface along the rotary kiln 12 can be estimated from the electrical signal of the couple 30. Also, thermocouple 3
0a is located near each end of each section 17 near the exterior surface of the kiln to generate an electrical signal that is used to turn off each heater 18 when an excessive temperature of the rotary kiln 12 is detected. The heater 18 can also be used in the event that any of the thermocouples 30a provided at the ends of the section 17 fails or there is a defect in the transmission or processing of signals from the thermocouples 30a at these ends. Can be switched off. Each lead from the thermocouple 30.30a is connected to a loop 31 before being fed into the housing or channel 32 on the rotary kiln 12.
(see FIG. 5) is formed. This housing 32 guides and protects the thermocouple leads from the point where they exit the rotary kiln 12 to the area 26 in circle A in FIG. The loop 31 is provided so that the difference in coefficient of thermal expansion between the lead wires of the rotary kiln 12 and the thermocouple can be compensated for by expansion and contraction of the loop 31. For each section, another set of thermocouples 30.30a is provided as a spare on the opposite side of the kiln (see Figure 6).
If a thermocouple breaks down, a corresponding spare thermocouple can be connected to shorten machine downtime.

Thermocouple 30.30a (including spare) is 4
the negative sides of all thermocouples 30 are commonly connected to one point 70 within the terminal block 40, and the positive side of thermocouples 30.30a The sides are connected to separate terminals of the block 40 via each braided wire 71. A single braided wire within the thermocouple sheath is shown at 72. The positive side of each thermocouple 30 is routed from the three sections 17 through the terminal block to a separate copper-clad mild steel slip ring 34 (
3 and 8) and the common negative side is connected to a single slip ring 34a. The positive sides of the thermocouples 30a of the three sections 17 are each connected to yet another slip ring 34, and the negative sides of the thermocouples 30a are connected to another single slip ring 34.
connected to a. Spare thermocouples are connected to the slip ring when needed. cold bot seal 41
connects the main wire 72 of the thermocouple to the flexible wire 71
This is connected to the terminal block 40. The seal 41 is held by a frame 42 fixed to the kiln 12, and a terminal block 40 is fixed to the frame 42.

The wires extending from the terminal block 40 to each slip ring 34.34a are doubled by being connected in parallel to both main slip ring sections, as described below. The slip rings 34, 34a are supported by angularly spaced axial metal plates 44 (FIG. 4), with a suitable sheet of insulating material 35a inserted to prevent the slip ring signals from shorting together; This bracket 45 is supported by a bracket 45.

It is then fixed to the kiln 12 by bolts 48 (
Figures 3 and 4). Thermocouple terminal block 4
0 is supported by a frame 42 (see FIG. 4). Slip ring 34.34a is coaxial, electrically conductive and substantially annular. The slip rings 34.34a are electrically insulated from each other by insulating brushes 35, which connect the slip rings to the seat 35a and the plate 4.
4 accepts bolts (not shown) that hold it in place.

As is clear from Figure 3, slip ring 34.34
The electrical signals from a are collected by each conductive contact member in the form of a brush gear arrangement 50, each brush gear arrangement having a holder 5 supporting a pair of carbon brushes 52.
1, the carbon brushes 52 are spring-biased by springs 53 to engage the outer peripheral surface 34b of each slip ring, and are electrically connected in parallel to provide redundancy. Each holder 51 is attached to a translational member or bar 55 disposed on a carrier 56 (not shown in FIG. 4), which translates relative to a fixed table 57 in the longitudinal direction of the rotary kiln 12 and It can be translated in the direction shown by B in Figure 4. Thereby, the rotary kiln 12 can perform expansion and contraction movements in the axial direction with respect to the fixed end of the roller attachment portion 24. table 5
The movement of the bar 55 relative to 7 is controlled by a transverse ring 58 provided in the kiln 12, which ring 58
Ring 34.34a is larger in diameter than ring 34.34a.
34a on the heater 18 side (FIG. 2). A transverse ring 58 is positioned at one end of the bar 55 between the branches 59 of a guide member or fork 60 (FIG. 4). Leads (not shown) from brush 52 are connected to a monitoring device (described below with reference to FIG. 8) that displays the temperature profile and detects temperatures that are considered outside the acceptable range. A control device can be activated that counts the readings. The fork 60 can be deflected, such as by depending a weight from here on, as shown schematically at 60a in FIG.
It always abuts one side of the transverse ring 58 to ensure that the movement of the transverse ring 58 is accurately transmitted to the bar 55.

The slip ring 34.34a is divided into three sections, shown in FIG. has been done. These sections 67, 68, 69 also allow the brush 5 to rotate during rotation of the kiln 12 in the selected direction indicated as C in FIG.
2 between sections 67 and 68 1 between sections 68 and 69 and between sections 69 and 67 (shown exaggerated). There is.

This ensures that the brush 52 is not subjected to undue destructive forces when passing through the joint between the sections 67, 68, 69. The above steps are, for example, 0.16c,m. Additionally, the ring 34.34a is arranged slightly eccentrically to allow the brush 52 and its associated spring 53 to move radially during operation and to prevent the brush 52 from remaining fixed in one position. Preventing 2 Now, FIG. 8, in which similar parts are indicated by the same reference numerals and from which the outline of the operation of the plant can be predicted, will be described below. In FIG. 8, the center thermocouple 30 is a thermocouple for temperature control, and the thermocouples 30a on both sides are the above-mentioned shutoff thermocouples, and all the thermocouples 30 in FIG.
The negative leads of the two sections (only one section) are connected in common by line 70. Line 70 is thermocouple 3
0.30a, one for each of the measuring devices 1i81.81a. In order to eliminate common mode defects, the positive side of each thermocouple 30.30a is connected to each device 81. 81a. In FIG. 8 the slip ring 34.34a is shown schematically. The output from device 81.81a is sent to plant monitoring bag Mho. The output of device 81a is sent to an overtemperature protection device 83, which reduces or cuts off power to heater 18 when excessive temperature is sensed. Device 81 is connected to a temperature control device 84 that adjusts or cuts off power to heater 18 to maintain the sensed temperature within a desired range or value. These monitoring functions will be obvious to those skilled in the art and are only shown schematically.

It will be understood that the number of thermocouples may be reduced or increased depending on the application. For example, in the rotary kiln 12, the thermocouple 30b
(see FIG. 1) may be placed within the kiln at its longitudinal center to monitor the temperature of the material being processed within the kiln 12. The positive terminal of this added thermocouple is connected to a separate slip ring 34, but its negative terminal is the same as that used by the common negative terminal of the center thermocouple 30 in FIG. It is connected to the slip ring 34a. A spare slip ring 34 may be provided to allow additional thermocouples to be installed during use of the rotary kiln assembly.

In FIG. 2, 12 slip rings 34° 34a are shown, one for each thermocouple 30° 30a.
One slip ring 34 (i.e. nine slip rings) and two slip rings 34a each used as a common slip ring by the central thermocouple 30 and the thermocouples 30a at both ends (total one
1 slip ring). Spare slip rings 34 can be used for additional thermocouples or other applications in the rotary kiln 12. If so, further thermocouples can be provided within the rotary kiln near both ends of the rotary kiln. These thermocouples are placed in cantilevered metal tubes extending into the rotary kiln 12, and the leads from such thermocouples are connected to slip rings 34.3.
4a and the associated brushes can be connected to the control device.

Referring to FIGS. 9 to 12, which show a more compact signal transfer system, each slip ring 34, 34a is formed of three partial annular sections electrically connected to each other, as described above. .

According to this variant, the sections forming each slip ring 34 (with the exception of slip ring 34a) are arranged between adjacent ends of the sections without an electrical braid or the like interconnecting them. electrically insulating insert 90,
They are electrically isolated from each other, for example by placing a PTFE insert (FIG. 12). Additionally, a single sensor (
Rather than connecting a thermocouple to a slip ring (for example, a thermocouple), according to this variant a separate sensor is connected to each section of each slip ring, so that each slip ring 34 is connected to three sensors ( Figure 11). With such an arrangement, the number of slip rings 34 can be significantly reduced. As mentioned above, one pole (eg, the negative side) of each sensor is connected to a common slip ring 34a.

Although in the embodiment described above each slip ring 34 is divided into three sections, it is possible to increase or decrease the number of sections per slip ring and connect a corresponding number of sensors to each set of sections. can. The sections of each ring are arranged such that all gaps between the sections are substantially axially aligned with corresponding gaps between sections of every other set.

In order to easily distinguish between the sections of each set and thereby correlate the output of each brush gear arrangement 51,52, means are provided for generating a signal representative of the kiln position. Such means include, for example.

It consists of a suitably placed inductive proximity sensor 100.102 and a target or marker 104.106. Thus, for example, sensors 100 and 102 are mounted on a fixed structure and the target rotates with the kiln. In one configuration, two targets 104 and 106 are combined in one set of axially aligned sections, only one target 104 is combined in a second set of axially aligned sections, and Only one target 106 is associated with the third set of axially aligned sections. In this way, sensor 100.10
The output of 2 can be used to indicate which segment is crossing the brush gear arrangement 51, 52 at that moment. Targets 104, 106 may be circumferentially coextensive with their associated sections, or may be somewhat shorter in circumferential length.

Now, a description will be given of FIG. 10, which shows how the signal of the thermocouple to the multi-channel recorder 108 is supplied from one section of the slip ring.

After the thermocouple signals are collected by each brush gear 50 , they are processed (e.g., amplified) by signal conditioning circuitry 110 and processed by multiple sample/hold circuits 11 .
2 sent to a-c. Its outputs are connected to separate channel inputs of recorder 108. Circuits 112a-c
are each controlled by an enable signal sent via line 114 by logic circuit 116, and are controlled by logic circuit 114.
operates to analyze the output of the proximity sensor 100.102, thereby determining which particular section of the slip ring (and thus which thermocouple) the brush gear 50 has engaged. Therefore, for example, the proximity sensor 100
．． If both 102 produce outputs indicative of the presence of both targets 104 and 106, circuit 112a is enabled to receive the thermocouple signal and forward it to recorder 108. If only one target 104 is detected, circuit 112b is enabled.

Similarly, five circuits 112c are enabled if only one target 106 is detected.

In more sophisticated circuit configurations, the signal of the thermocouple is repeatedly sampled during the time that the brush gear is engaged in each section, e.g., to obtain an average value and feed this to a multichannel recorder. A microprocessor is used.

The present invention has been described in detail regarding transmitting electrical signals from a thermocouple, but the present invention can also be applied to transmitting electrical signals from a plurality of strain gauges attached to a rotating member, for example. can.

[Brief explanation of the drawing]

FIG. 1 is a side view of the rotary kiln assembly, and FIG. 2 is a side view of the rotary kiln assembly.
3 is a side view of the slip ring or sensing assembly; FIG. 3 is an axial view of the slip ring and contact assembly taken along line ■-■ of FIG. 2; FIG. 4 is an axial view of the slip ring and contact assembly taken along line EV-IV of FIG. FIG. 4A is a partial side view of the slip ring assembly taken along line A--A in FIG. 4; FIG.
The partial side view of the rotary kiln, Figure 6, is the ■- in Figure 5.
- Axial view along the line; Figure 7 shows the installation of the thermocouple; Figure 8 shows the electrical connection to the thermocouple; Figure 9 shows the assembly shown in Figure 4. FIG. 10 is a block diagram of a circuit for correlating the output of the contact member to each set of sensors; FIG. 11 is a partial side view of the slip ring assembly corresponding to FIG. FIG. 12 is a diagram showing a modification of FIG. 3. 10...Rotary kiln assembly 11...Material introduction section 12...Rotary kiln 13...Material discharge section 14...Solid material supply inlet 15...Material outlet 17...Controllable section namely zone 18...external heater section, i.e. zone 19.20...sealing section 21.22...concrete support 24.25...roller mounting section 30.30a...thermocouple 31...loop 32...Housing 34.34a
... Slip ring 34b ... Slip ring outer peripheral surface 40 ... Terminal block 42 ... Frame 44 ...
・Metal plate 45...Bracket 50...Brush gear structure 51...Holder 52...Carbon brush 53...
・Spring 55... Translation member 57... Fixed table 58... Transverse ring 59... Branch 60... Fork 67, 68, 69... Slip ring section 80...
・Plant monitoring device 81.81a...Measuring device 83...Excess temperature protection device 84...Temperature control device Continued from page 1 Priority claim 61984N-December 178 @ Igi 1 [Phase] Inventor Ean Samuel Davidson J.S. (GB) [Phase] 8431755 Warrington Risley, Cheshire, United Kingdom (no street address)

Claims (11)

[Claims] (1) In a rotary kiln equipped with a plurality of sensing means and an electrical transfer system for transmitting electrical signals from the sensing means to a fixed receiver, the transmission system comprises a plurality of coaxial, substantially annular conductive member (34) and a laterally facing peripheral surface (34) for each of these annular members.
b) each electrically conductive contact member (52) arranged to contact the annular member and the contact member, wherein the annular member and the contact member are arranged such that relative rotation between the annular member and the contact member is caused by rotation of the rotary kiln. The transfer system further includes means for displacing the contact member in the longitudinal direction in response to the longitudinal displacement of the annular member.
8, 60, 55). (2) The annular member is coaxially attached to the rotary kiln and electrically connected to the sensing means, and the contact member is electrically connectable to the receiver. The rotary kiln described in item (1). (3) The resilient means (53) are arranged to deflect the contact member radially towards each annular member, as claimed in claim (1) or (2). rotary kiln. (4) The above-mentioned displacing means is a ring member (
58), a translation member (55) extending parallel to the axis of the rotary kiln and attaching the contact member, and a guide member (60) attached to the translation member, the guide member comprising: , The rotary kiln according to any one of the preceding claims, wherein the rotary kiln is arranged with respect to the ring member so as to translate the translational member in response to longitudinal displacement of the ring member. (5) The guide member is offset toward one axial side of the ring member, and the guide member comprises a fork member having a branch (59) around the ring member. The rotary kiln according to paragraph (4). (6) Each annular member has a plurality of sections (67, 6
8, 69) A rotary kiln according to any one of the above claims. (7) The eccentric relationship of said sections is such that during said relative rotation in a selected direction, each contact member is displaced radially inwardly. rotary kiln. (8) The transfer of electrical signals from the sensing means to the stationary receiver takes place through the action of multiple sets of partial annular members, so that during each rotation of the rotary kiln, each contact member of each set The rotary kiln according to any one of the preceding claims, wherein the partial annular members are engaged one after another, and the partial annular members are electrically separated from each other and electrically connected to each sensing means. . (9) means (1) for detecting at least one predetermined angular position of the rotary kiln with respect to one or more reference positions;
00,101104,106), thereby making it possible to relate the output signal obtained from each contact member to the partial annular member (and thus to the sensing means) that provided this output. The rotary kiln described in item (8). (10) The rotary kiln according to any one of the above claims, wherein the sensing means includes a temperature sensing member (30). (11) some of said sensing members (30b) generate electrical signals related to the temperature of the internal region of the rotary kiln, and another several of said sensing members (30, 30a) relate to the temperature of the rotary kiln; 11. A rotary kiln as claimed in claim 10, wherein the sensing member is arranged in the rotary kiln so as to generate an electrical signal.