Instructor Guide. 215: Elevator: Mechanical Drive Systems Module 4: Hydraulic Drive Systems
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1 PR EV IE W O N LY Instructor Guide 215: Elevator: Mechanical Drive Systems Module 4: Hydraulic Drive Systems
2 Table of Contents Overview Hydraulic Drive Components...10 Hydraulic Drive Variations...47 Summary..56 1
3 Icons Used In This Guide Agenda Topic # Topic Title Duration 1 Overview 30 minutes Hydraulic Drive Components Field Trip Hydraulic Drive Variations Field Trip Summary Total Time: 60 minutes 60 minutes 50 minutes 60 minutes 40 minutes 300 minutes 2
4 Overview Purpose The purpose of this module is to: Provide the participant with an overview on the drive system functions for hydraulic elevators. Objectives At the end of this lesson, the transit elevator/escalator trainee will be able to: Explain how a direct-acting hydraulic cylinder operates Identify major components of the hydraulic drive systems Identify variations in the direct acting hydraulic drive systems Explain the differences between roped and direct acting cylinder systems Variation in hydraulic drive systems Explain how a roped hydraulic system operates Materials Mandatory Make sure you have the following Optional PowerPoint Presentation Coursebook Quizzes Pencils Elevators nd Edition You may also want the following for optional activities: Chalk board with chalk, large paper with marker, etc. Internet connection Lab, simulator or out of service elevator 3
5 Module Length: 300 min Time remaining: 300 min This section: 30 min (7 slides) Section start time: Section End Time: REVIEW introduction slides Welcome to the course on Elevator Mechanical Geared Drive Systems. This module gives the participant an in-depth look at the major components of hydraulic drive systems. In this module the participant will identify these components as they examine the path of fluid in the hydraulic circuit. Compared to traction elevators, hydraulic elevators are less complex mechanically making them ideal for low-rise installations. The main disadvantage is that they require more power to operate. There are also environmental concerns should either the lifting cylinder leak fluid into the ground. PPT slides 1, 2 4
6 Module Length: 300 min Time remaining: 300 min This section: 30 min (7 slides) Section start time: Section End Time: REVIEW key terms As well as Oil cooler, Overspeed valve, Packing head, Piping system, Piston, Pressure relief adjuster, Roped hydraulic, Rotary pump, Shut-off valve, Silencer Solenoid, Solenoid coils, Solenoid switch Storage tank, Submersible pump, System pressure, Up (U) Solenoid, Up Stop (US) Solenoid, Valve PPT slide 5 7
7 Module Length: 300 min Time remaining: 300 min This section: 30 min (7 slides) Section start time: Section End Time: ASK participants what they remember about safety and elevators SMALL GROUP ACTIVITY WRITE Thinking back to other courses or just in general, What do you know about elevator mechanical hydraulic drive systems? [Allow participants to think for a minute and perhaps discuss with a partner ideas as well as write down any ideas. Discuss participant responses and if possible list them on a chalk board or similar.] PPT slide 6 8
![[ to next slide for larger diagram] In earlier courses, the participant learned that hydraulic elevators are designed to move the piston up using pressurized suspension means (hydraulic](/docs-images/92/110007230/images/8-3.jpg "fluid) and using a gravity and control valve to bring the piston down.")
8 Module Length: 300 min Time remaining: 270 min This section: 60 min (36 slides) Section start time: Section End Time: REVIEW slides Lets begin with our first objective: to identify major components of the hydraulic drive systems. [ to next slide for larger diagram] In earlier courses, the participant learned that hydraulic elevators are designed to move the piston up using pressurized suspension means (hydraulic fluid) and using a gravity and control valve to bring the piston down. A hydraulic elevator is one in which liquid under pressure is available at all times for transfer into the hydraulic jack. Here are the major components we will cover. [Direct participants to the components and their locations on the illustration.] PPT slides 8, 9 10
9 Module Length: 300 min Time remaining: 270 min This section: 60 min (36 slides) Section start time: Section End Time: REVIEW slide The cylinder is the outermost lining of a PPT slide 10 hydraulic jack. Inside the cylinder are the piston and the fluid reservoir. [Point out the cylinder, and then point out the piston and fluid reservoir to participants.] 11
10 Module Length: 300 min Time remaining: 270 min This section: 60 min (36 slides) Section start time: Section End Time: REVIEW slide REFER participants to Elevators nd Edition, Section 5.7, pages to review illustration. A detailed discussion on hydraulic drives is found in Elevators nd Edition, Section 5.7, pages Topics covered are: rated speed, operating speed, direct hydraulic driving machine, hydraulic jack, cylinder, and piston. [Refer participants to Elevators nd Edition Section 5.7 pages to review the illustration.] PPT slide 31 Elevators nd Edition 32
11 Elevator Hydraulic Drive Systems Module Length: 300 min Time remaining: 270 min N LY This section: 60 min (36 slides) Section start time: DO O The controller controls the solenoid coils which direct the flow of hydraulic fluid. Flow can be directed back to the tank or it can send the hydraulic fluid out to the piston. If it is directed by the controller to operate the car, the controller can energize the Up (U) and Up Stop (US) solenoid coils which start the operation of the elevator in the up direction. The elevator transitions from fully stopped to contract speed. Materials Needed PPT slide 36 PR EV IE W REVIEW slide SAY Section End Time: When the car approaches the correct floor, the controller removes power from the Up (U) solenoid which slows the elevator to leveling speed. Continued - 37
12 Elevator Hydraulic Drive Systems Module Length: 300 min Time remaining: 270 min N LY This section: 60 min (36 slides) Section start time: DO O Upon receiving a signal that the elevator is level, it drops the Up Stop (UP) solenoid thereby signaling the pump motor to stop. Materials Needed PPT slide 36 W REVIEW slide SAY Section End Time: PR EV IE The valve then sets checking the flow of hydraulic fluid to lower the elevator. 38
13 Elevator Hydraulic Drive Systems Module Length: 300 min Time remaining: 270 min N LY This section: 60 min (36 slides) Section start time: DO To lower the elevator, the controller energizes the Down (D) and Down Stop (DS) solenoid coils which O REVIEW slide SAY Section End Time: Materials Needed PPT slide 37 W IE PR EV opens a path for hydraulic fluid to allow the valve to uncheck the system thereby allowing hydraulic fluid to return to the reservoir at contract speed. The controller drops the D solenoid 24 to 30 inches from the landing which transitions the elevator 8 to 10 feet per minute. When the controller receives the indication that the elevator is level, the controller deenergizes the DS solenoid thus stopping the hydraulic fluid flow and holding the elevator at the landing. 39
14 Module Length: 300 min Time remaining: 270 min This section: 60 min (36 slides) Section start time: Section End Time: ASK Three important paths of hydraulic fluid include (check all that apply) a. Storage tank b. Muffler c. Rotary pump d. Valve Call on participants for answer once given the correct answer Answer: a., c., d. PPT slide 39 41
15 Module Length: 300 min Time remaining: 270 min This section: 60 min (36 slides) Section start time: Section End Time: ASK The gauges the weight PPT slide 42 of the elevator fully assembled and loaded to capacity with test weights. a. A Port b. Rupture Valve c. B Port d. Motor Call on participants for answer once given the correct answer Answer: c. 44
16 Module Length: 300 min Time remaining: 210 min This section: 60 min Section start time: Section End Time: ASK CLASSROOM ACTIVITY [At instructor s discretion, take time to visit the field and/or lab to look for examples hydraulic drive system components.]. PPT slide 44 46
17 Module Length: 300 min Time remaining: 150 min This section: 50 min ( 14 slides) Section start time: Section End Time: ASK Maintenance can be difficult in a PPT slide 56 hydraulic system due to leaks that may occur underground. a. Roped b. Holeless c. Rotary Pump d. Direct Piston Call on participants for answer once given the correct answer Answer: d. 58
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