DE2317107A1 - METHOD AND DEVICE FOR ADJUSTING A CONE CRUSHER UNDER LOAD - Google Patents

Description

DIPL.-ING. A. GRÜNECKER βοοο MÖNCHEN 22

MaximMianstrasse 43 DR.-ING. H. KINKELDEY Telephone 297T00 / 2967 «

DR.-ING. W. STOCKMAIR, Ae. E. (CAUF! FJST OFTECHN) telegrams

PATENT LAWYERS

P 6056 April 5th 1973

REXNORD INC.

47OI West Greenfield Avenue

Milwaukee, Wisconsin USA

Method and device for adjusting a cone crusher under load

The invention relates to a method of adjustment the gap size of a cone crusher in operation, which has an essentially closed support frame, an adjustable crusher casing arranged in the support frame, a crusher cone mounted in the support frame so as to be movable in a rotating manner opposite the jacket and one for the jacket Has locking the same in the support frame onerous locking arrangement, as well as a device for performing of the procedure.

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Bank accounts: M. Aufhäuser, Munich 173533 ■ Deutsche Bank, Munich 16/25078 · Post check account Munich 46212

In a cone crusher of the type mentioned, the jacket is usually screwed into an adjusting ring with a thread, which in turn by means of a detachable, spring-loaded or pneumatically actuated locking arrangement the support frame is held. The coat must be readjusted at certain time intervals, be it., to change the size of the crusher gap or be it to compensate for wear on the coat and / or its lining. For this purpose, the jacket or the collar is in one or twisted in another direction, causing the coat raises or lowers. When breaking very hard, one The jacket must have a high wear-causing material if necessary, readjusted very frequently, for example every eight hours, to compensate for the abrasion. To do this, \ the crusher is usually shut down to allow the thread between the jacket and the collar to rotate of the two parts is not damaged against each other. Shutting down the crusher causes an interruption in operation, requires additional work and is therefore expensive and bothersome overall.

An important aim of the invention is to provide a method and to provide apparatus for moving a cone crusher under load, i.e., for moving the Crusher during the passage and breaking of material, so that the crusher does not need to be shut down. In particular, the invention is intended to readjust a Cone crusher under load without any; Enable jacket thread.

For this purpose, it is provided in a method of the type mentioned according to the invention that the jacket during the full locking load is applied during normal crusher operation that the locking load to adjust the jacket is reduced so far that the jacket can be adjusted, but one sufficient locking load is maintained,

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to safely support the jacket on the frame that the jacket while maintaining the partial load to the required Measure is adjusted and that the full locking load is brought into effect again after the adjustment has been completed will.

An apparatus for carrying out said method is characterized according to the invention by an arrangement for applying a full locking load to the shell during normal operation of the crusher, by a Arrangement for partially reducing the locking load for adjusting the jacket to a degree that the Can move coat, but sufficient to safely support the coat against the webs Locking load is retained, and by an arrangement for re-supplying the full locking load after finishing the adjustment of the jacket.

In an advantageous embodiment of the invention In the method, the jacket is rotated by means of at least one hydraulic working cylinder, with the locking load at the beginning of a working cycle of the cylinder is reduced and at the end of the working cycle it is automatically back to full Effect is brought about. The device according to the invention is suitable for use with both a working pressure locking arrangement and a resting pressure locking arrangement. An adjustment arrangement cooperating with the device according to the invention preferably has double-acting and / or in pairs arranged working cylinders, by means of which the jacket automatically in can be rotated in either direction.

The invention offers the advantage that no changes to the structure of the crusher itself are required for its application only minor changes to the hydraulic system of the crusher are necessary. This allows the invention both when building a new crusher and with little

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Include effort in an existing crusher. Another advantage of the device according to the invention lies in that it requires little maintenance. '

The following are embodiments of the invention described with reference to the drawing. It shows:

Pig. 1 is a partial view of a conventional cone crusher in vertical section,

Fig. 2 is a diagram of a hydraulic system for the Crusher according to Fig. '1,

3 shows a modification of the system according to FIG. 2,

Fig. 4 shows a hydraulic system with arranged in pairs Working cylinders,

Fig. 5 is a partial view of another embodiment of a cone crusher in vertical section,

Fig. G is a schematic of the hydraulic system for a rocker arm locking arrangement for the crusher jacket,

6 shows a modification of the system according to FIG. 6,

8 shows a partial view of yet another embodiment of a cone crusher in vertical section and

Fig. 9 is a diagram of a hydraulic system for the Crusher according to Fig. 8. ·

The part of a conventional cone shown in Fig. 1 ^ - Crusher has a substantially closed support frame 10 with a protruding on or near the upper EncLe Flange 12. This carries an adjusting ring 14, which on its inside threads 16 for the

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Engagement of threads 18 on the outside of a Crusher jacket 20 has. The jacket 20 carries an upper wear element in the form of a lining 22, which is detachably attached by means of a holding arrangement 24, se that it is after reaching a certain degree of wear can be exchanged. The coat is with the lutter in a known manner over and around one Arranged around crusher cone 26, which is rotatably movably mounted in the support frame. Along with the chuck 22, the crusher cone 26 delimits a crusher gap 28, when passing through a material in a known manner Way is broken and crushed.

Between the adjusting ring 14 and one above the same screwed onto the jacket 20 with an internal thread Lock ring 30 are multiple actuators used. Together, these exert an upward pressure on the locking ring, which thereby strives is to lift the jacket This arrangement serves to reduce the thread clearance between the jacket and the collar Eliminate it by pressing the beveled upper flanks of the threads of the jacket against the beveled ones holds the lower flanks of the threads of the adjusting ring. This means that there is only any play in the threads still between the horizontal lower flanks of the jacket thread and the horizontal upper flanks of the collar thread available. The lifting force exerted by means of the actuating devices 32 via the locking ring 30 causes on the one hand a locking of the jacket against rotation with respect to the adjusting ring and on the other hand misplaced the existing thread play on the underside of the threads of the jacket, so that this is under the action from upward impacts generated by the crusher cone during operation are not in the collar starts beating.

In the case of the actuating or holding device o: 32 used in the arrangement according to FIG.

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for example, disc spring stacks, applied to the locking ring 30. The actuating devices 32 also each contain a hydraulic piston-cylinder arrangement for compressing the springs and thus for lifting the ″ ^; by this exerted load, so that the jacket 20 ″ - ■ can lower itself within the limits given by the thread play. This then releases the lock and the jacket can be rotated. Such a locking arrangement working with hydraulic cylinders is known per se in U.S. Patent 3,140,835.

After releasing the lock, the jacket can be rotated by means of one or more hydraulic working cylinders 34-. The hydraulic working cylinder 34 is via an articulated connection 36 attached to a bearing block 38, which of its ^ - is mounted on the adjusting ring 14 so that it can be pivoted about a vertical axis. The piston rod protruding from the cylinder carries at the end a cheese 40, with which it is attached to teeth or notches of a ring gear 42 engages. The ring gear 42 sits on a rigid or motion-transmitting with the Jacket 20 connected Außeninantel 44. When turning the The outer jacket by means of the working cylinder becomes the inner Coat also rotated in a known manner.

Sometimes it happens that the crusher passes through the crusher gap Fixed, non-breakable material such as metallic foreign objects or large pieces of wood clogged. Acquaintance Crushers have a number of hydraulic lifting cylinders, optionally arranged on bases 48 along their circumference 46 to, -which when operated together over possibly elongated piston rods 50 a lifting force exert on the collar to overcome the mantle to lift the spring forces holding it down so that the crusher gap can be cleared again -.-

The above description relates to a conventional cone crusher and is used for a better understanding of the

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procedures and arrangements described below.

From the cited US-PS 3,140,835 it is known " the lifting force exerted on the jacket to lock it in place is complete to lift and thus to release the jacket to twist. To do this, however, the crusher must first be shut down so that the shock loads do not affect the released one Soak in the coat. In contrast, in the arrangement according to the invention, the lifting force is only partially canceled. A Part of the lifting force is retained, so that the thread play is not released, i.e. the lifting force is reduced just enough that the jacket can be turned. The remaining one Part of the lifting force is sufficient to take the weight of the shell and associated parts so that the Thread play not at the top, as with the complete lifting of the lifting force, but at the bottom of the Threads of the jacket is located. These effects can be in different ways and with different kinds Achieve locking arrangements.

Pig. Figure 2 shows a hydraulic system with one of one Motor 54 driven pump 52, which is a hydraulic oil sucked in via a filter 58 from a storage container 56 and it conveys under pressure via a line 60 to a control slide 62. A conventional Be connected to pressure relief valve 64, via which the oil to the container 56 at a predetermined excess pressure flows back.

The system shown contains two double-acting working cylinders 34 for turning the jacket. The two cylinders 34 are for example at a mutual distance of 180 °. arranged on both sides of the shell and aligned so that they do this, "each time in the same direction, from above clockwise or counterclockwise when viewed. By feeding the cylinder 34 via the control slide 62 and a line 65 become the piston rods

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.1

- 8 ■ —-.

the same stretched out, and when fed via a line 66, retracted. The line 65 is a branched line 68 leading to the locking cylinders _{32 9 of which only one is shown here.} * however, in the practical version there are several cylinders connected in series or in parallel «The line 68 feeds the locking cylinder 32 via a pressure reducing valve and a servo valve 72, which is open in the idle state. A servo-operated relief valve 7 ^ is connected to the supply line of the locking cylinder 32, which when actuated via a servo line -76 allows the hydraulic oil to escape to the container 56 λ «, -

The partial release of the lock is done in the following way; The control slide 62 is shifted to the right so that the working cylinders 3 ^ are fed via the line 65 and extend their piston rods ", at the same time the locking cylinders 32 are fed via the line 68 with the pressure reducing valve 70 and the servo valve 72, which is also open 70 is set so that it closes at a certain pressure. For this purpose, a pressure range is again selected ₉ in which the cylinders 32 partially 'released' the lock Locking by the cylinder 32 _s. Whereupon the pressure reducing valve 70 closes and the pressure is fed to the working cylinders 3 ^ to rotate the jacket. "At the end of the stroke of the working cylinder 3 ² J- the pressure in the line 65 continues to rise and certain value "the opening of the servo valve 7 ¹ ^? so that the cylinders 32 are relieved of pressure and the springs assigned to them lock the jacket again. Thus the jacket is immediately locked again at the end of the stroke of the working cylinder 34.

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If the control slide 62 is then moved to the left, so the working cylinder 34 to retract their Piston rods fed via the line 66 and the line 65 is relieved via a line 78 to the storage container 56 The pressure reducing valve 70 opens at the same time as the servo relief valve 74 closes. so that the locking cylinder 32 continue to be relieved.

The operations described above cause the jacket lock to be partially released. Sometimes the lock should However, the jacket can also be completely loosened, for example when the jacket and the putter are worn out to such an extent that that they have to be replaced. The complete unscrewing of the jacket by means of the working cylinder 34- would be far too time-consuming, which is why a rope is usually wrapped around the coat and then this is done by pulling on the rope by means of a crane, a tractor or the like. Snow is rotated. For other reasons, it may be necessary to fully release the coat and move it in more quickly Rotation to raise or lower. The complete release of the lock is carried out by means of another, via a Line 80 connected to the pump 52 control slide While the first control slide 62 is in the neutral position, the second control slide 82 be operated to the locking cylinder 32 via a Line 84 to feed. The servo valve 72 is acted upon via a branch line in order to close it, so that the hydraulic oil does not flow via the line 68 to the working cylinders 34 and extend them. The servo operated Relief valve 74 remains closed because servo line 76 is not under pressure. On the second Line 80 carrying control slide 82 can also be connected to a pressure relief valve 88.

Further, the hydraulic system shown in Fig _T 2 comprises a line circuit for the lifting cylinder 46, of which in Fig. 2 only one is shown. The line 78 leads to

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a third control slide 90 »which the lifting cylinder Via an adjustable throttle passage 96 feed tv ^ JIi e Lift cylinders are arranged around the crusher and in Connected in series or in parallel. While the first and second spool 62 and 82 in are in the neutral position, the slide 90 actuate the lifting cylinders 4-6 via a non-return valve · ,, valve 94 · to be fed with the hydraulic fluid so that the coat with the adjusting ring and the associated Facilities against the load from the hold-down springs lifts and the crusher gap can be cleared. When changing over the control slide 90, the lifting cylinders 46 to the storage container 56 are relieved. To a violent one Hit the collar with the jacket on the frame under the influence of the very strong hold-down springs To prevent the pressure fluid is drained through the throttle passage 96 and thus the lowering speed limited.

In certain systems, the lifting cylinders are only very seldom, maybe only used twice a year while adjusting the crusher several times a day may be necessary. Very high working pressures are required for the lifting cylinders, because the hold-down springs are compressed when they are actuated Need to become. The lines and pumps provided for this must be designed to be correspondingly strong, So much more than is necessary for the arrangements for locking and adjusting the jacket. The modification of the system according to FIG. 2 shown in FIG. 3 takes these circumstances into account and points for the supply the lifting cylinder 46 has a hand pump 98, with a control slide 90 and an arrangement 92 of a check valve and throttle passage. In this case, the pump 52 and the line 78 can be very much smaller connects the control slide 62 directly to the storage container 56. The line circuit for the lifting cylinder can be very strongly developed here, while the locking

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and one-time arrangements can be constructed from weaker and therefore cheaper parts.

The embodiment shown in FIGS. 1 and 2 is a working pressure adjustment arrangement with a Internally threaded locking ring surrounding the jacket. Instead, however, the locking ring could also be a Have external threads and engage the upper part of the collar, as described in US Pat. No. 3,397,846. For The high pressure feed of the lifting cylinder can also be a smaller pump in connection with a pressure booster be provided.

The above-described arrangement of the working cylinders ^v for rotating the jacket corresponds essentially to that described in US Pat. No. 3,009,660 and in US Pat. No. 3,325,108. Instead, however, this arrangement could be of the type disclosed in U.S. Patent 3,396,915.

Instead of the two individual or single-acting ones arranged at a mutual distance of approximately 180 ° on both sides of the jacket Working cylinders can also use two pairs of working cylinders offset from one another by approximately 180 ° so that the jacket can be adjusted either upwards or downwards without having to change the working cylinder, as in U.S. Patents 3,570,774 and 3,396,915 is described. An arrangement of the hydraulic system with working cylinders arranged in pairs is shown in FIG. 4 shown. In it is a cylinder 100 for adjusting the jacket in the one and another cylinder 102 for Adjustment of the jacket provided in the other direction. For adjustment in both directions you can use two cylinders. be present, so that each a pair Cylinders on opposite sides of the shell, as described in US Pat. No. 3,570,774. A A considerable part of the system shown in Fig. 4 corresponds to that shown in Fig. 2 and therefore does not need to be rewritten. A number of control spools

104, 106, 108 and 110 are connected to the pump via a pressure line 112. The control slide 104 controls the supply of the working cylinder or cylinders 100 to reduce the size of the crusher passage via lines 114 and 116, and the control slide 106 controls the supply of the cylinders 102 to widen the gap via the lines 118 and 120. The slide 108 controls the supply of the lifting cylinders 122, provided that these are included in the system, as in FIG. 2, and not independent of it, as in Mg. 3. Finally, the slide 110 controls the feeding of the locking cylinders 126 via a line 124 for complete release of the locking. To separate one arrangement of working cylinders from the other and to prevent hydraulic ^{oil from penetrating the arrangements of working cylinders when the locking device 1 is completely released} by means of the slide 110, four servo valves 128, 130, 132 and 134, which are open in the idle state, are provided.

With increased wear of the jacket and the lining, which is noticeable by the increase in the grain size of the broken material, the crusher gap must be narrowed by moving the jacket downwards. Thereupon the servo valve 134 closes first and thus blocks the connection to the working cylinder 102 for the widening of the gap. Furthermore, the locking cylinders 126 for partially releasing the locking are fed by pressure via a line 136, the servo valves 128 and 130 and via a line 124. At a predetermined pressure, a pressure switch 138 responds and thereby closes a solenoid valve 140 assigned to it, which holds the locking _{cylinder 126 in the partially released position 9} whereupon the working cylinders 100 move the jacket downwards. At the end of the stroke of the working cylinder 100, the pressure in the Line 136 on, so that a relief valve 142, which can be actuated via a servo line 144, opens and the locking cylinder 126 is relieved towards the storage container in order to fully lock the jacket again.

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To move the jacket upwards, the working cylinder 102 is fed by actuating the slide 106, the servo valve 128 initially closing due to the pressure increase in the line 118 in order to block the connection with the working cylinder 100. Due to the following pressure increase across the servo valves 13 ² J- and. 132, the cylinders 126 are actuated to partially release the lock. At a predetermined pressure, the solenoid valve 140 is closed via the pressure switch 138 to hold the locking cylinder in the partially released position. The working cylinder 102 then comes into action until the pressure increase at the end of its stroke opens the relief valve 142 via the servo line and the jacket is automatically fully locked again.

To completely release the locking of the jacket, the control slide 110 is actuated, whereupon the first two servo valves 130 and 132 are closed via the servo line assigned to them in order to establish the connection to the To lock working cylinders 100 and 102 and the relief valve. As with the arrangement according to FIG. 2 or 3, can the slide 108 controls the lifting cylinders 122 that are included in the system or are separate from it.

The one in Pig. The embodiments shown in FIGS. 2 to 4 are intended for a so-called working pressure adjustment arrangement, as they do in U.S. Patent 3,140,835. They are also suitable for another one described in US Pat. No. 3,162,387 Working pressure adjustment arrangement in which the jacket is loaded upwards by means of springs via a rocker arm arrangement is.

Such an arrangement is shown in FIGS. the The hydraulic system shown in Fig. 6 largely corresponds to that shown in Fig. 2 and has the same working cylinder, the associated control slide, the same pump, etc., so that these parts are not repeated are provided with reference numerals and described. In this

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One and the same hydraulic cylinder or one and the same cylinder arrangement is used to compress the springs holding the jacket in a locked position and to lift the jacket against the load from the hold-down springs to clear the clogged crusher gap. a first stage for partially releasing the jacket lock for adjusting the same under load, a second step for completely releasing the lock for quick adjustment or for removing the jacket and a third step for lifting the jacket to clear the crusher gap. Ln Fig. 5 and 6 only one such cylinder 145 is shown in each case. As can be seen in FIG engages a locking ring 148 from below. There are several such cylinders 14 around the crusher 5 provided with them assigned Kipphelen.

A control slide 149 controls the pressure supply to the cylinders 145 via lines 150, 151 and 152 for the partial Release the lock. At the end of the stroke of the adjusting or working cylinder, a servo-operated relief valve opens 154 »to relieve the cylinder 145 su and the So that the coat can be fully locked again. To raise the jacket, a control slide 156 is operated to the To feed cylinder 145 via an arrangement of check valve and throttle passage 158 and a line 160. A servo valve 162 which is provided in the line 152 and is open in the idle state is switched via a servo line 164 operated to prevent the hydraulic fluid from flowing back to prevent over this line. When lowering the coat The servo valve remains under the load counteracting the cylinders 145 by the very strong hold-down springs 162 is closed until all of the hydraulic fluid has flowed back through the throttle passage of assembly 158.

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As "in the embodiments described first, the Arrangement for lifting the jacket can be designed separately from the locking and adjusting devices. Such a modification is shown in FIG. The line 160 is fed therein by a hand pump 166. When the cylinders 14-5 are pressurized to partially release the lock, an existing in the line 160 becomes Servo valve 168 actuated to allow hydraulic fluid to exit the cylinders to the hand pump impede.

In yig .. 8 is part of another conventional cone crusher with a so-called resting pressure locking arrangement shown. The crusher has a frame 200 with a flange protruding outward at or initially at the upper end 202 as a support for an adjusting ring 204, which with a Internal thread 206 is in engagement with an external thread of the shell 208. The jacket 208 is spinning above one Arranged movably in the support frame 200 crusher cone 210 and partially surrounds it.

The adjusting ring 204 · carries a rotatable outer jacket with an upstanding peripheral wall 214 and one ring cover 216 welded or otherwise fastened to the top thereof. The ring cover 216 carries in the circumferential direction of the rotatable outer shell a number of piston-cylinder assemblies 218, of which only one is visible in FIG. 8, however. One on the inside of the peripheral wall 214 upright, attached web 220 is framed on both sides by a pair of pegs 222 protruding from the jacket 208. As a result, the inner jacket 208 and the outer jacket 212 are connected to one another in a manner that transmits movement in the direction of rotation.

The resting pressure locking arrangement exerts a lifting force on the Jacket off in order to relocate any thread play to the underside of the jacket thread during operation and the

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Mutual threads in a fixed "mutual system to keep.

The individual piston-cylinder assemblies 218 are preferred evenly spaced around the crusher and connected in series or in parallel via pressure lines. The plant can be pneumatic, preferably but operated hydraulically. An embodiment for the in] fig. 8 shown resting pressure locking arrangement ' is described in U.S. Patent 3,133,708.

For adjusting or rotating the jacket after the release of at least _x .Arretierung a hydraulic Arbeitszylin- of 223 is provided.

9 shows a hydraulic system with a pump 224, which is driven by a motor 225 and sucks hydraulic fluid from a container 226 via an udder 228 and via a pressure line 230 to a control slide 232 feeds. With the pressure line 230- is a conventional pressure relief valve 234 connected, via which the hydraulic fluid flows back to the container at a predetermined overpressure.

In 3 ig. 8 and 9 is only one working cylinder each shown, but usually at least two are at each other opposite sides of the shell arranged, double-acting Cylinder present, by means of which the jacket 208 each clockwise or in the same direction is rotatable against this. Zürn protruding the Piston rods are fed to the working cylinders 223 via a line 236 extending from the control slide 232, and for pulling in the piston rods via a line 238. When pressure is fed to the working cylinder 223 for rotating the Mantle, a servo valve 242 is actuated via a servo line 240 branched off from the line 236 in order to certain pressure a relief of the locking cylinder

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effective piston-cylinder assemblies 218 to effect.

The pump 224 has a plurality of pistons and cylinders, the majority of which feed the pressure line 230. One example only Pressure line 244 fed by a cylinder of the pump leads to a control slide 246 and serves to prevent pressure medium losses equalize on the locking cylinders 218. Another pressure line fed by a cylinder of the pump 248 leads to a control slide 250, via which a selector slide 252 can be actuated. From the control slide carries a line 254 and a further line 256 over the selector slide 252 to the locking cylinders 218. At the On the outlet side of the selector slide 252, a pressure sampler or equalization tank 258 is connected to the line 256. An electrical pressure switch 260 acted upon by the pressure in line 256 is used to switch the on and off Pump motor 225 via an electrical line 262. A pressurized via a line 266 with the pressure of the line 244 Relief valve 264 causes the relief of a valve connected to the control slide 232 at a certain pressure Line 268 via line 270 to the storage container. A check valve 272 arranged in line 268 prevents the return of the hydraulic fluid from the line 244. A pressure reducing valve 274 is used to release and blocking the flow of pressure medium from the locking cylinders 218 via the servo valve 242 to the container predetermined pressures.

The locking mechanism is partially released as follows: The locking cylinders are stationary during operation under full pressure and thereby keep the coat locked. For this purpose, the control slide 246 is set so that the Pressure medium via line 230, slide 232, lines 268 and 244, slide 246, lines 254 and 256 and the selector valve 252 to the locking cylinders 218 arrives. The pressure equalization tank 258 keeps the pressure at a certain value and compensates for pressure medium losses

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the locking cylinder to a certain extent. To adjust the jacket, the locking cylinder 218 must first be partially depressurized. To this end, the slide 250 and, via this, the selector slide 252 are actuated in order to block the line 256 with the pressure switch 260. Thereupon the control slide 232 is actuated for the pressure feed of the working cylinders 225 to extend the piston rods. The relief valve 242 is opened by the pressure produced in the line 240, so that the hydraulic fluid emerges from the locking cylinders 218 to the reservoir. In the event of a predetermined decrease in the pressure in the locking cylinders, the valve 274 closes and thus blocks the further exit of the pressure medium. To this end, the valve 274 different at comparable ^pressures% is adjustable. The response pressure can be set so that the locking cylinder still wear the jacket with the associated parts, so the thread play is not released without the load exerted preventing the jacket from turning. Then the working cylinders 223 come into action to rotate the jacket. At the end of its stroke, the slide 232 is reversed manually or automatically, so that the working cylinders for pulling in the piston rods are fed via the other line 238. During this process, the pressure in the locking cylinders 218 remains unchanged.

Under certain operating conditions it can happen that - "_ the coat adjusts itself up or down.

In order to prevent this, a positive locking of the one shown in FIG. 5 in the hydraulic system Applicant's US Pat. No. 3,133,708 may be provided.

A locking mechanism of the type described in US Pat. No. 3,142 is also suitable the applicant described Art.

Depending on the desired size of the adjustment, the working cylinders can be operated one after the other as often as desired. When moving the jacket downwards! the pistons in the

hydraulic locking cylinders slowly pulled downwards, so that the pressure would have to increase the same. However, this is prevented by the fact that the pressure in the line 240 during the spring working stroke of the working cylinder 223 rises, as a result of which the relief valve 242 opens again and the overpressure escapes via the valve 274 until it closes again at the set pressure.

After the adjustment has been completed, the control slide 232 brought to stop the working cylinder 223 in the rest position. Likewise, the slide 250 is back in its Brought locked position, so that the selector slide 252 again opens. Then the control slide 246 is actuated to the Druckspeisuhg the locking cylinder 218 of the Restore pump 224 via lines 230, 244 and 254. Due to the pressure relief of the line 240 is the relief valve 242 is closed. When the pressure in the locking cylinders rises to a certain value opens the valve 264 acted upon by the pressure in the line 266, so that the in the lines 230 and 268 conveyed pressure medium via line 270 to the storage container returns. Thereafter, the pressure medium is only via line 244 to line.254 and to the locking cylinders 218 funded. When a set Pressure switch 260 switches off pump motor 225. The locking cylinders are now under full pressure.

The pressure losses that occur in every system that is continuously pressurized are initially taken from the pressure compensation tank balanced until the pressure switch 260 responds and turns the pump motor 225 back on. Since the valve 264 through the pressure in the line 266 is kept open, the pressure medium is only delivered via the one cylinder the line 244 connected to the pump 224. The pressure line 230 feeding four cylinders convey the pressure medium back into the container in a short cycle. To the described to ensure automatic filling of the pressure must

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the control slide 246 in operation, so as long as the locking cylinder should be under full pressure, remain in the actuation position. . "

The partial release of the lock is described above. Sometimes it is also necessary to completely loosen the jacket lock, for example to replace one heavily worn mateis or fodder. The whole. Unscrewing the jacket by means of the working cylinder would be much too time-consuming, which is why a rope is usually wrapped around the coat and then this is done by pulling on the rope, for example by means of a crane, a tractor or the like. Fast is rotated. There may also be other reasons why it may be necessary to fully release the coat in order to put it in faster rotation to raise or lower. For this purpose, the supply to the locking cylinders 218 is controlled Slide 246 brought into a position in which a complete pressure relief via line 2 - 6 to the Container takes place. This relieves the entire locking load on the jacket so that it can rotate freely leaves. '.

For lifting the jacket to clear the breaker gap blocked by metallic foreign bodies, larger pieces of wood, due to drive malfunctions or for other reasons, an arrangement of lifting cylinders with the associated line circuit can be provided in conjunction with the system according to FIGS. 8 and 9. Such an arrangement contains several lifting cylinders distributed around the crusher, connected in series or parallel to one another, which are connected to a motor-driven or manually operated pump via lines and control slides. Such an arrangement, not shown for clarity here ^he is described in US Patent No. 3,440,835 4 Applicant.

The direction of the pitch of the threads between the jacket and the collar with respect to the direction of the

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Circular movement of the crusher cone and the resulting "reaction forces resulting from breaking" affects the force required to adjust the crusher. Depending on the thread pitch or its direction, the can be derived from the direction of the circular movement of the Reaction force resulting from the crusher cone · the adjustment favoring the mantle upwards or downwards. For this reason, when the lock is partially released depending on whether the reaction force runs in the respective adjustment direction or in the opposite direction is effective, different pressures may be required.

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Claims (15)

Patent claims : Method for adjusting the size of the gap in a "cone crusher in operation" which has an essentially closed support frame, an adjustable crusher casing arranged in the support frame, a crusher cone that is rotatably mounted in the support frame in relation to the casing and a crusher cone that loads the casing to lock it in the support frame Has locking arrangement, characterized geke η, η ζ ei chne t that the jacket is subjected to the full locking load during normal crusher operation, that the locking load for adjusting the jacket is reduced to such an extent that the jacket can be adjusted, but with a sufficient locking load is maintained in order to support the jacket securely on the frame, that the jacket is adjusted by the required amount while maintaining the partial load and that after the end of the adjustment the full locking load is brought into effect again. 2. The method according to claim 1, characterized in that the jacket by means of a thread arrangement is held adjustable in the support frame that the locking assembly exerts a lifting force on the jacket and that the jacket is rotated for adjustment. 3- The method according to claim Λ or 2, characterized in that the crusher has drive devices for rotating the jacket and that the full locking load is automatically brought into effect after each work process of the drive devices. 4. The method according to at least one of claims 1 to, characterized in that the crusher at least a hydraulic working cylinder for rotating the 309843/0442 Has jacket and that the full locking load in each case at the end of the rotation of the jacket, accordingly the end of a working stroke of the cylinder, automatically to Effect is brought about. 5. Device for performing a method according to at least one of claims 1 to 4-, for setting the gap size of a cone crusher in operation, which has an essentially closed support frame, an adjustable crusher casing arranged in the support frame; mounted breaker cone and a locking arrangement that loads the jacket for locking it in the support frame having, characterized by an arrangement (30, 32) for exerting a full locking load on the jacket (20) during normal operation of the crusher, and by means of applying a partial Locking load so that the jacket can be adjusted. 6. Apparatus according to claim 5-> characterized in that the means for applying a partial locking load an arrangement (62) for partially reducing the locking load for the adjustment of the jacket to a level at which the jacket can be moved, but with one for secure support of the jacket relative to the frame (10) sufficient locking load is retained, and an arrangement (7 ^ ·, 76) for include re-applying the full locking load upon completion of the pitching of the jacket. 309843/0442 7 ·. Apparatus according to claim. 5 or 6, thereby g e -. indicates that the jacket (20) is in Threaded engagement with the support frame (10, 14) is located and is adjustable by turning this opposite and that the Arretieranordmmg (30, 32) the jacket by an upward Directional loading in the threads (16) of the & jacket holds locked. . ' 8. Device according to one of claims 5 to 7 »thereby g e k e η η ζ ei c h η e t. that the crusher "drive devices (34) for rotating the jacket (20) as well as Devices (74, 76) for automatically applying the full locking load at the end of each working cycle of the drive devices having. 9. Apparatus according to at least one of claims 5 8, characterized in that the crusher has at least one working cylinder (34) for rotating the jacket (20) in each sighting, a hydraulic system (56 to 84) for feeding the or the working cylinder (s) and the locking arrangement (32) as well as a device (104, 106) for locking a working cylinder s when the other working cylinder is actuated. ^J 10. Device according to at least one of claims 5 9, characterized in that it is an arrangement (80 to 84) for the complete release of the jacket lock (32) and one for the complete release of the lock responsive device (86, 72) for blocking the connection between the hydraulic system and the or the working cylinder (s) (34). 3 0984 3 / 0Λ4 1 11. The device according to at least one of claims 5 to 10, characterized in that the thread play between the jacket (20) and the (supporting frame eliminated with each adjustment of the shell by the upward loading of the locking assembly (30, 32) is. 12. The device according to at least one of claims 5 to 11, characterized in that the working cylinder or cylinders (34-) when exercising a partial Load through the locking arrangement (30, 32) for rotating the jacket (20) can be actuated or are and that the locking arrangement is automatically switched to at the end of a working stroke of the working cylinder or cylinders Exercise the full locking load can be actuated. 13. Device according to at least one of claims 5 to 12, characterized in that they have hydraulic drive devices (3 * 0 on the crusher for Adjustment of the jacket (20) and an arrangement for automatically reducing the locking load at the beginning of a Has working cycle of the drive devices. Device according to at least one of claims 5 to 13, characterized in that it Means (70; I38, 140; 274) for automatic interruption the reduction of the locking load when a predetermined lower load is reached. 15. Device according to at least one of claims 5 to 14, characterized by an arrangement (244, 246, 254, 256, 260) for automatic balancing of losses of the hydraulic pressure medium in the locking arrangement (218) when exercising both the full and also the partial locking load. 309843/0442 Blank page