Double Toggle Jaw Crusher Suppliers And Crushing For Sale
Double Toggle Jaw Crusher Instruction
These heavy duty double toggle jaw crushers are built by SBM Machinery in Shanghai, China. Over half a century of engineering skill in the crushing field is behind every SBM Double Toggle Jaw Crusher. A crusher that reflects a policy of continuous research and design improvement. The result is a crusher designed to withstand extremely arduous conditions. Highly efficient and of advanced design, SBM Double Toggle Jaw Crushers contain features that combine high production, operating economy and ease of maintenance into one great crusher.
Some of the many features of these crushers are shown below and are referred to in the accompanying pages. AII sizes of machines are fitted with SBM curved scientifically proportioned jaw faces. Some of the advantages offered by these crushing members are as follows:
No Choking or Packing
The fixed jaw is convexed and the moving jaw concaved at a point slightly below the central horizontal plane of the crushing chamber. Thus, the controlling zone, which in crushers having straight jaws is located at the discharge point where choking occurs, is moved upward to a point near the greatest convexity of the fixed jaw face. In this position relatively coarse material will pass through the zone creating much larger voids which are essential to eliminate packing and choking of material.
The controlling zone has the smallest volume of any in the crushing bowl, all below being progressively larger. As soon as the material is crushed in the controlling zone, it is, therefore, afforded an unobstructed fall into a zone of greater volumetric space and, at each successive crushing stroke, the same thing happens until the lowest or discharge zone is reached which has the greatest volume of all. Thus all possibility of packing or choking as the jaw moves to a closed position is practically eliminated.
Large Capacities and Low Horsepower
As no power is wasted in overcoming packing at the discharge point, SBM curved crushing surfaces apply power as a direct crushing force for the purpose desired, namely, breaking the stone. The horsepower consumption per ton of material crushed to a given size is therefore, considerably lower in the case of SBM Double Toggle Jaw Crusher compared with crushers employing the straight type of jaw laces or conversely, for a given size of SBM machine operating at a common setting with machines of standard design a considerable increase in output may be obtained without requiring any increase in input horsepower
Finer Settings
Because choking and packing at the discharge point is eliminated, it follows that SBM Double ToggleType Jaw Crushers can be operated at considerably finer settings than in the case of crushers with straight type jaw faces.
Economy of Operation and Maintenance
Due to the better distribution of the crushing work over the lower ends of the jaw laces (see sketch below), there is less wear and tear than is the case of machines having straight jaw laces. The SBM Double Toggle Jaw Crusher has a direct "squeeze" action, i.e. rubbing is reduced to an absolute minimum – particularly at the bottom of the crushing zone where most wear normally occurs.
Angle of Nip
A feature of SBM Double Toggle jaw crushers is that the angle of nip progressively decreases as material proceeds towards the lower end of the jaw faces.
Jaw faces
The jaw faces are either corrugated, smooth or partly smooth – partly corrugated depending upon the duty required.
Frame
The frame is fabricated from heavy mild steel plate with reinforcing ribs welded into place. The frame is of immense strength without the inherent weaknesses associated with a cast type frame.
Welding is carried out by modern welding processes and after fabrication the whole frame is stress relieved prior to being machined to accommodate the internal components. When it is necessary to make frames in more than one piece to facilitate transport and handling, the sections are spigot joined in a manner that preserves one piece frame rigidity.
Bearings
The pitman and main frame bearings are S.K.F. heavy duly sell-aligning double row roller bearings of ample capacity. The larger size units have provision for a hydraulic process which uses oil pressure to expand the inner races of the shaft bearings. This permits bearings to slide freely on the shaft so that installation and maintenance become relatively simple matters.
The bearings are effectively sealed against the ingress of dust and dirt by grease filled labyrinth seals. The grease lubricant is injected through large orifice nipples by means of a high pressure hand compressor gun supplied with the crusher.
Pitman
The pitman is a one piece design steel casting bored to a line tolerance to accommodate the roller bearings. The lower end of the pitman is of box section construction for maximum strength and has two machined recesses to receive the seatings for the front and rear toggles.
Pitman Shaft
The pitman shaft is forged high strength alloy steel, heat treated and tempered. It is machined and accurately ground to provide a particularly hard and durable seating for the roller bearings.
Swing stock
The swing stock is of cast steel of extra heavy design being will ribbed on the back in order to secure maximum strength. It is machined on the lace which carries the swing jaws. In the back, near the bottom end, there is a machined recess to receive the seal for the front toggle and an attachment is provided for the end of the tension rod or rods. The hub of the swing jaw is accurately bored and fitted with manganese bronze bushings. The cavity between the bushings forms a large grease reservoir.
Swing stock Shaft
The swing stock shaft is of alloy steel, machined and accurately ground on the journal surfaces. The shaft is securely clamped into the frame on each side and forms a lie member to stiffen the frame at the top.
Jaw faces
Both fixed and moving jaws are of manganese steel two piece design. The jaws are ground on the backs to ensure proper seating in the crusher without the aid of a zinc backing. Allernative design jaw faces are available to suit special applications.
Jaw Backing Plates
Fixed and moving jaw backing plates are incorporated in the design of the crusher. Impounding of the profile of the back of the jaw face should be expected, if the backing plates are so badly damaged that they cannot provide adequate support for the jaw face, then they should be replaced to protect the frame and jaw holder.
Cheek Plates
The cheek plates are made of abrasion resistant steel plate and are bolted in place. In the larger units each cheek plate is made in Iwo or more sections ensuring minimum maintenance cost by permitting worn sections to be removed and replaced.
Toggles
The toggles are of cast steel or fabricated from mild steel plate with high carbon steel ends welded on. After machining to the correct profile the ends are flame hardened. The toggle seals are of heat treated alloy steel. As will be seen from the diagrams, the toggles roll across the flat pressure lace of the toggle seat.
No rubbing or scuffing takes place and friction is kept to a minimum. This type of toggle system has the following advantages over the conventional socket end type toggle and seat: (a) No lubrication whatsoever is required. (b) The system can handle far greater toggle pressures (c) The life factor of toggles and seals is many times greater
Hydraulic Toggle Adjusting Mechanism
Adjustments for wear and minor adjustments in the opening are made with the toggle adjusting mechanism described below. Major adjustments are made by the use of a different length frony toggle.
The swing jaw setting can be varied by the toggle adjusting mechanism by inserting steel plate shims of varying thicknesses between the rear toggle block and the back plate of the crusher frame. The sliding toggle block is moved to the desired position by means of a hydraulic cylinder, two cylinders being used on the larger machines.Discover your crusher and grinder machine at the discount!
