Chain pull analyzer system

• US 4,803,886 A
• Filed: 01/14/1988
• Issued: 02/14/1989
• Est. Priority Date: 01/14/1988
• Status: Expired due to Fees

• Current Assignee: Southern Systems Incorporated Memphis TN
• Original Assignee: Southern Systems Incorporated Memphis TN
• Inventors: Curtiss, Peter, Foshee, Terry, May, Larry
• Primary Examiner(s): Ruehl, Charles A.
• Application Number:
  US07/143,673
• Time in Patent Office: 397 Days
• Field of Search: 73/862.39, 73/773, 340/870.38, 340/870.16
• US Class Current: 73/862.392
• CPC Class Codes: G01L 5/047 Specific indicating or recording arrangements, e.g. for remote indication, for indicating overload or underload
• CPC Class Codes: G01L 5/102 using sensors located at a non-interrupted part of the flexible member

Abstract

A chain pull analyzer system including a telemetry unit for sensing the strain experienced by the chain while under load and in operation and for transmitting a radio frequency signal proportional to the strain and a data unit for receiving the radio frequency signal transmitted by the telemetry unit and for producing strain data output based on the radio frequency signal. The telemetry unit includes a strain sensing unit for sensing the strain experienced by the chain while under load and in operation and for producing an electrical signal based on the strain, the strain sensing unit including a body member for replacing one of the center links of the chain; a signal conditioning unit for converting the electrical signal produced by the strain sensing unit to an analog signal, the signal conditioning unit including a body member for replacing one of the center links of the chain; a radio frequency transmitter unit for transmitting the analog signal of the signal conditioning unit, the radio frequency transmitter including a body member for replacing one of the center links of the chain; and a source of electrical energy for energizing the strain sensing unit, the signal conditioning unit and the radio frequency transmitter.

Claims

1. A chain pull analyzer system for monitoring the tensile stresses of a conveyor chain while under load and in operation, said chain including a plurality of elongated center links, a plurality of connecting plates, and a plurality of connecting pins for pivotally connecting said center links to said connecting plates, said system comprising:

(a) telemetry means for sensing the strain experienced by said chain while under load and in operation and for transmitting a radio frequency signal proportional to said strain, said telemetry means including;

(i) a strain sensing means for sensing said strain experienced by said chain while under load and in operation and for producing an electrical signal based on said strain, said strain sensing means including a body member for replacing one of said center links of said chain;

(ii) a signal conditioning means for converting said electrical signal produced by said strain sensing means to an analog signal, said signal conditioning means including a body member for replacing one of said center links of said chain;

(iii) a radio frequency transmitter means for transmitting said analog signal of said signal conditioning means, said radio frequency transmitter including a body member for replacing one of said center links of said chain;

(iv) a source of electrical energy for energizing said strain sensing means, said signal conditioning means and said radio frequency transmitter; and

(b) data means for receiving said radio frequency signal transmitted by said telemetry means and for producing strain data output based on said radio frequency signal.

2. The system of claim 1 in which said data means includes a radio frequency receiver for receiving said radio frequency signal from said transmitter, a signal conditioning means for converting said analog signal received by said receiver into an electrical signal, and data output means for producing a "readable" output of said signal from said signal conditioning means.

3. The system of claim 2 in which said data output means includes a display chart recorder means for displaying said signal from said signal conditioning means.

4. The system of claim 3 in which said display chart recorder includes a digital display for displaying the chain pull in pounds, a bar graph display for displaying the chain pull as a bar graph.

5. The system of claim 4 in which said bar graph display includes a variable speed chart printer to print said bar graph at a speed proportional to the speed of said chain.

6. The system of claim 2 in which said data output means includes a record playback means for recording an audio recording of said signal from said signal conditioning means.

7. The means of claim 6 in which said record playback means includes a video camera having the audio input thereof electrically coupled to the audio output of said signal conditioning means for recording a video image of said chain on standard video film as said radio frequency signal is transmitted by said telemetry means and for similtaneously making an audio recording of the analog signal transmitted via radio transmitter on the audio portion of said video film.

8. The system of claim 6 in which is included a direct connection electrical conductor for extending between the output of said strain sensing means of said telemetry means and the input of said signal conditioning means of said data means for providing a direct electrical connection therebetween.

9. The system of claim 8 in which said data means includes a three-way switch for allowing said signal conditioning means of said data means to be selectively electrically coupled to said radio frequency receiver of said data means, or to said direct connection electrical conductor, or to the output of said record playback means for allowing the audio portion of a recording of said signal from said signal conditioning means of said data means to be played back through said display chart recorder.

10. The system of claim 1 in which said source of electrical energy of said telemetry means includes a body member for replacing one of said center links of said chain.

11. The system of claim 10 in which all working components of said strain sensing means are mounted within said body member thereof.

12. The system of claim 11 in which all working components of said signal conditioning means are mounted within said body member thereof.

13. The system of claim 12 in which said radio frequency transmitter means includes an antenna, and in which all working components of said radio frequency transmitter means with the exception of said antenna are mounted within said body member thereof.

14. The system of claim 1 in which said strain sensing means, said signal conditioning means, said radio frequency transmitter means and said source of electrical energy of said telemetry means are integral with said chain and positioned within the envelope transversed by said chain.

15. The system of claim 1 in which said strain sensing means, said signal conditioning means, said radio frequency transmitter means and said source of electrical energy of said telemetry means each have a cross-sectional area substantially no larger than the cross-sectional area of said chain.