Rock processing plant

Abstract

Rock processing plant (10) with a process unit (20) to which a walkable work platform (30) is assigned, wherein the process unit (20) has a projection (24.5) with which it extends into the working area formed by the work platform (30), wherein the work platform (30) has a fall protection device (35), in particular in the form of a railing, wherein the work platform (30) has a platform widening (33) in the area of ​​the projection (24.5) to create a working area to the side of the projection (24.5), characterized by that the stage extension (33) has a floor section (33.1) as a working surface which is mounted in such a way that it can be folded or pivoted between a folded-down working position in which the floor section (33.1) is walkable and an erected transport position, that the fall protection (35) is guided in the area of ​​the stage widening (33), that at least one locking section (36.6) is coupled directly or indirectly to the bottom section (33.1) in such a way that when the bottom section (33.1) is adjusted, the locking section (36.6) is adjusted. wherein in the transport position the locking section (36.6) blocks access to the projection (24.5) at least partially and in the working position the locking section (36.6) is moved out of the access area (35.2).

Description

[0001] The invention relates to a rock processing plant with a process unit to which a walkable work platform is assigned, wherein the process unit has a projection with which it projects into the work area formed by the work platform, wherein the work platform has a fall protection device, in particular in the form of a railing, and wherein the work platform has a platform widening in the region of the projection in order to create a work area to the side of the projection.

[0002] Rock processing plants are used for various purposes. For example, they are used to crush and / or screen recycled and / or rock material in a processing process. These machines can be used either as mobile or stationary systems. The material to be processed is fed into the plant via a feed unit. Excavators are typically used for this purpose. The excavator places the material to be crushed or screened into a conveyor chute of the feed unit. From the feed unit, the material to be processed is transported in the conveying direction to a downstream processing unit by a conveyor system. In the downstream processing unit, the material is then processed, for example, crushed or screened.

[0003] Work platforms are attached to the sides of the rock processing plant. The machine operator can move around on these for maintenance or inspection purposes.

[0004] Rock processing plants are machines with considerable external dimensions. Low-loaders are used to transport them to the respective work site. The external dimensions must be such that transport can take place within legally permitted limits. Working platforms often prove problematic, particularly where the maximum installation space is limited in width. Sometimes the machine is designed in such a way that machine components form projections that protrude into the area of ​​the working platform. Operating personnel then have to step over these projections when accessing the working platform, which should be avoided for safety reasons. To avoid this, platform extensions are sometimes used to allow access around the projection. However, this then adversely affects the external dimensions of the machine.

[0005] Document DE 603 ​​14 729 T2 discloses a self-propelled jaw crusher vehicle for crushing concrete and asphalt pieces or the like. Material to be crushed is fed to the jaws via the feed unit. The material is crushed by a vibrating jaw moving toward and away from a stationary jaw. The vibrating jaw is contacted by a reaction force absorbing mechanism comprising a toggle plate. The toggle plate is held between the toggle plate support element and the vibrating jaw by a toggle plate holding mechanism.

[0006] Furthermore, document JP H08 - 71 446 A discloses a construction rubble crusher for crushing construction rubble and rock. This construction rubble crusher has steps and an associated railing to provide the accessibility necessary for operating the construction rubble crusher.

[0007] It is an object of the invention to provide a rock processing plant of the type mentioned at the outset which is compact for transport purposes and which meets the requirements for occupational safety where a projection of a machine component protrudes into the working area of ​​the work platform.

[0008] This object is achieved with the features of claim 1. Accordingly, it is provided that the platform extension has a floor section as a working surface, which is pivotally mounted in such a way that it can be folded or pivoted between a folded-down working position, in which the floor section is accessible, and an erected transport position. In such a stone processing plant, the floor section can be folded out for transport purposes, so that the platform extension does not, or does not significantly, affect the machine dimensions. Once the machine has been brought to the work site, the floor section can be folded into the working position. According to the invention, it is further provided that the fall protection is guided in the area of ​​the platform extension. In this way, occupational safety is ensured when the floor section has been folded down and is in the working position.The operating personnel can thus walk around the area of ​​the projection safely. To prevent the operating personnel from climbing over the projection when the base section is in its unfolded transport position, the invention provides that at least one locking section is directly or indirectly coupled to the base section in such a way that when the base section is adjusted, the locking section is adjusted, wherein in the transport position the locking section blocks access to the projection at least in part and in the working position the locking section is moved out of the access area. The locking section then blocks the path to the projection. This can then no longer be easily climbed over, thus further improving work safety.

[0009] Preferably, the locking section is positively coupled to the base section. This ensures that the locking section also adjusts its position when the base section is pivoted. This ensures that the locking section reliably adjusts the path to the projection when the base section is in the unfolded position.

[0010] To optimise parts and assembly costs, it may be provided that the barrier section or sections are part of the fall protection system.

[0011] According to a preferred variant of the invention, it can be provided that the fall protection has a railing section which is guided in the area of ​​the stage widening, that a further railing section adjoins the stage widening on one side or both sides, and that the railing section of the stage widening has the locking section and that this railing section is pivotable relative to the adjoining further railing section(s).

[0012] Adjacent to the platform extension, the work platform can have at least one adjacent railing section. This is preferably a railing section of a fixed platform section that does not adversely affect the overall width of the machine. From this platform section, a user has access to the platform extension. Since the railing section associated with the platform extension is pivotable and has a locking section, it can be pivoted for transport purposes to save space, while simultaneously moving the locking section into the blocking position. This enables extremely simple operation.

[0013] If the base section is intended to cover the projection at least partially laterally in the erected transport position, the machine component forming the projection is protected.

[0014] A conceivable inventive design is such that the process unit has a barrier that defines the work platform on the side facing away from the fall protection device, that the projection protrudes from the barrier, and that the locking section extends between the barrier and the erected floor section in the transport position. When the platform extension is in the working position, the user can move safely between the barrier and the fall protection device. In the transport position, the locking section adjusts this area.

[0015] According to one variant of the invention, simple operation is achieved in that the fall protection device has a handrail that extends at least partially in the direction of the longitudinal extension of the floor section. The handrail is arranged for pivoting the floor section, preferably at least partially eccentrically to the floor section, in such a way that a force can be introduced via it to adjust the floor section between the working position and the transport position. The handrail thus simultaneously serves as a handle that is easily accessible and can be used to adjust the fall protection device and, with it, the floor section.

[0016] According to a further alternative to the invention, it can be provided that the work platform has two platform sections, wherein the platform sections are merged into one another via the platform widening, that the fall protection has two blocking sections, such that the first blocking section blocks access from the first platform section in the transport position and the second blocking section blocks access from the second platform section in the transport position. This makes it possible to secure the projection against unauthorized access on both sides with little construction effort. If it is also provided that the two blocking sections are coupled to one another in such a way that they are adjusted simultaneously when the floor section is adjusted from the working position to the transport position, then simple operation is possible.In particular, if the fall protection device is pivoted from one stage section, the access on the opposite side can also be blocked at the same time.

[0017] According to one variant of the invention, it can also be provided that a control lever is coupled to the base section via a control joint, that the control lever is coupled directly or indirectly to the locking section via a further control joint, and that the locking section is pivotable about a pivot axis formed by a preferably stationary joint, wherein the further control joint and the joint are arranged at a distance from one another. The movements of the base section and the locking section are coupled to one another via the control lever, in particular forcedly coupled. When the locking section is pivoted about the joint, the base section is entrained and also pivoted via the control lever. This enables simple operation. If a stationary joint is used around which the locking section pivots, then simple kinematics are possible.In particular, it can also be provided that the floor section can be pivoted about a rotation or pivot axis by means of at least one floor joint. This can also be a stationary mounting. If it is further provided that this floor joint, the two control joints, and the joint form a four-bar system, then particularly stable guidance is possible. The second control joint and the joint can, in particular, be assigned to the fall protection device. The control lever enables a stable coupling of the fall protection device to the floor section, which contributes to improved stability.

[0018] A stable coupling of the control lever to the base section is particularly easy to achieve if the base section has a limiting section that rises from the base section in the working position, and if the control lever is hinged to the limiting section via the control joint. In particular, it can also be provided that the limiting section is angled from the base section in one piece.

[0019] A rock processing system according to the invention can also be such that the railing section has the handrail and, at a distance therefrom, a securing section, in particular a securing tube, wherein the securing section extends at least partially in the same direction as the handrail, and that the handrail and the securing section are connected to one another by means of at least one strut and / or by means of the locking section. The handrail and the securing section reliably prevent falls when a user moves on the work platform. Because the locking section is now integrated into this structure by connecting the handrail to the securing section, it has a dual function. On the one hand, it stiffens the formed terrain structure. On the other hand, it serves as intended in the transport position to block access to the projection.

[0020] A preferred rock processing system according to the invention can, in particular, be such that the securing section has connecting sections in the region of its longitudinal ends, which extend in the direction of the width of the platform extension, and that bearing sections are formed in the region of the free ends of the connecting sections, which form the joints with a common axis of rotation about which the railing section can be pivoted. In this way, a stable pivot bearing for the railing section is formed with minimal construction effort.

[0021] To secure the position, it can be provided in particular that the working position and / or the transport position of the floor section is secured by means of a positive connection, for example with a linch pin, a bolt or a stop connection.

[0022] The invention is explained in more detail below with reference to an embodiment illustrated in the drawings. They show: Fig. 1: a rock processing plant in perspective view, Fig. 2: a schematic representation of the rock processing equipment according to Fig. 1 in side view, Fig. 3: one of the Fig. 1 extracted detail of the rock processing equipment in perspective side view, Fig. 4: the detail according to Fig. 3 in a changed perspective, Fig. 5: the detail according to the Fig. 3 and Fig. 4 in a front view, Fig. 6: the representation according to Fig. 3, but in a different operating position, Fig. 7: the representation according to Fig. 4, but in the changed operating position according to Fig. 6.

[0023] Fig. 1 shows a rock processing plant 10, which will be used to explain the invention by way of example. This rock processing plant 10 is a screening machine. However, the invention is not limited to application with a screening machine. Rather, the invention can also be used with other rock processing plants, for example, a rock crusher, in particular a jaw crusher or a rotary impact crusher. Furthermore, the invention can also be used with combined rock crushing plants and screening plants. The following explanations are therefore only described by way of example with reference to a screening plant. The following statements apply in particular to the aforementioned rock processing plants.

[0024] How Fig. As shown in Figure 1, the rock processing plant 10 comprises a machine frame 13 supported by undercarriages 14, which are designed, for example, as tracked drives. Furthermore, the rock processing plant 10 comprises a feed hopper 11. Through this hopper, it can be fed with rock material to be processed. A hopper discharge conveyor 12 is provided in the area of ​​the feed hopper 11.

[0025] Following the feed hopper 11, the rock treatment facility 10 has a processing unit 20. The processing unit 20 is a screening device. The structure and function of this screening device are described below with reference to Fig. 2. As this illustration shows, the process unit 20 has a screen deck 21 following the hopper discharge belt 12. The rock material is conveyed onto this screen deck by means of the hopper discharge belt 12. The screen deck 21 has a screen grate that has a predetermined mesh size. Rock material that cannot fall through the screen deck 21 due to its size is conveyed onto a conveyor belt 15 and from there onto a dump heap. The rock material that falls through the screen deck 21 reaches the screen deck 22. The screen deck 22 again has a predetermined mesh size. Rock material that does not fall through the screen deck 22 is fed to a conveyor belt 17. This conveyor belt 17 leads laterally out of the working area of ​​the process unit 20. The screened material is piled up, as shown in Fig. 2. The screened material that falls through the screen deck 22 reaches a conveyor device 23, for example, a continuously rotating conveyor belt. The screened fine material is guided to a conveyor belt 16 and discharged from the machine's working area. The screened fine material is piled up again to the side of the machine. The two screen decks 21 and 22 are driven by oscillating drives, in particular eccentric drives.

[0026] The conveyor belt 15 can be moved to a lower position so that the overflow upper deck material of the screening deck 21 and the overflow lower deck material of the screening deck 22 are discharged via the conveyor belt 15, thus screening out only two screening fractions. Accordingly, only one lateral conveyor belt 16 is installed. The second lateral conveyor belt 17 was omitted, or it was either removed or moved to a position / arrangement on the system in which this conveyor belt is deactivated.

[0027] Furthermore, it is conceivable that the conveyor belt 16 and the conveyor belt 17 can be optionally mounted on one of the two sides of the machine, as Fig. 1 compared to Fig. 2 can also be seen. Furthermore, it is conceivable that the conveyor belt 16 and also the conveyor belt 17 are arranged on the same side of the system.

[0028] How Fig. 1, the machine has working platforms 30 on both sides of the machine. The working platforms 30 are each accessible via a ladder 18. The working platform 30 is in Fig. 3. As can be seen from this illustration, an access platform 31 is provided adjacent to the ascent 18. The access platform 31 transitions into an inclined stage section 32. This fixed stage section 32 is adjoined by a stage extension 33. The stage extension 33 transitions into another fixed stage section 34. The stage sections 32, 34 have a walkable access area that transitions into a floor section 33.1 of the stage extension 33.

[0029] How Fig. As can be clearly seen in Figure 3, the working platform 30 is delimited on one side by a boundary 24 of the processing unit 20. The boundary 24 can, for example, be designed in the form of a wall that extends in the longitudinal direction of the working platform 30 and thus in the longitudinal direction of the rock treatment device 10.

[0030] A component of the process unit 20 is connected to the boundary 24. This component has a projection 24.5 that protrudes beyond the boundary 24 on the outside. The projection 24.5 protrudes beyond a base area 39 that extends below the projection 24.5. The base area 39 is aligned with the two stage sections 32 and 34.

[0031] The floor section 33.1 of the stage extension 33 is in the Fig. 3, the working position is extended laterally opposite the platform sections 32, 34. In this way, a user moving on the working platform 30 can bypass the projection 24.5 when walking between the two platform sections 32, 34 without having to climb over it.

[0032] The arrangement of the projection 24.5 is particularly Fig. 5. As this illustration illustrates, the projection 24.5 can, for example, comprise a motor 24.6 and an eccentric gear 24.4, wherein the motor 24.6 drives the eccentric gear 24.4 to generate eccentric vibrations. The eccentric gear 24.4 is flanged to the boundary 24, and the motor 24.6 protrudes significantly beyond the boundary 24, projecting beyond the base region 39 located below the projection 24.

[0033] Fig. Figure 4 shows that a working area of ​​the process unit 20 is formed between two adjacent boundaries 24. An eccentric shaft, which is connected to the eccentric gear 24.4, is guided between the two boundaries 24 and runs protected within a casing tube 34.3. Fig. Figure 4 also shows a screen deck support 21.1 to which the screen deck 21 can be replaceably mounted. A screen deck support 22.1 for the screen deck 22 is also shown. Finally, conveyor means 23.1 for the conveyor device 23 are also shown. To reinforce the two boundaries 24 against each other, additional struts 24.1 are provided, extending between the boundaries in the working area. On the outside, the struts 24.1 are additionally bolted to the boundaries 24 via support devices 24.2.

[0034] How Fig. 3, the work platform 30 is delimited on the side opposite the boundary 24 by means of a fall protection device 35. The fall protection device 35 can have multiple sections. In the present exemplary embodiment, the fall protection device has a safety section 35.1 in the area of ​​the access platform 31. Furthermore, a fixed railing section 35.3 is arranged at a distance from the safety section 35.1. This railing section 35.3 is permanently assigned to the platform section 32. Between the safety section 35.1 and the railing section 35.3, an access area 35.2 is recessed from the fall protection device 35. The access platform 31 is accessible via this access area 35.2 via the ladder 18.

[0035] Another railing section 35.4 of the fall protection system is assigned to the platform section 34. This railing section 35.4 is followed by an end section 35.5. This section bridges the area between the railing section 35.4 and the boundary 24 of the process unit 20.

[0036] A railing section 36 is located between the two railing sections 35.3 and 35.4. This railing section 36 is assigned to the stage extension 33.

[0037] The structure of railing section 36 is more clearly shown in Fig. 4. As this illustration illustrates, the railing section 36 has a handrail 36.2. This handrail 36.2 is preferably designed as a profile section, in particular as a hollow profile.

[0038] The handrail 36.2 has a section that extends in the longitudinal direction of the stage extension 33. Connecting sections 36.4 are angled from this section. These connecting sections 36.4 run in the direction of the width of the stage extension 33. The connecting sections 36.4 each merge into a locking section 36.6. The locking section 36.6 is preferably bent in one piece from the associated connecting section 36.4.

[0039] A securing section 36.1 is arranged below the handrail 36.2 and at a distance from it. The securing section 36.1 can also be designed in the form of a profile section, in particular as a hollow profile. At its two longitudinal ends, the securing section 36.1 has connecting sections 36.5. These connecting sections 36.5 can be bent in one piece from the securing section 36.1 or can be designed as separate components that are connected, in particular screwed, to the securing section 36.1.

[0040] The handrail 36.2 and the safety section 36.1 can be secured with one or as Fig. 4 shows two locking sections 36.6 being connected to each other. For example, one or both locking sections 36.6 can be bent in one piece from the handrail 36.2. The free ends of the locking sections 36.6 can, for example, be connected, preferably welded, to the connecting sections 36. Additionally or alternatively, it can be provided that the handrail 36.2 and the securing section 36.1 are connected to at least one strut 36.3.

[0041] The railing section 36 forms bearing sections at its longitudinal ends. These bearing sections can be formed, for example, by the ends of the connecting sections 36.5. These bearing sections are pivotally coupled to, for example, a post of the adjoining fixed railing section 35.3, 35.4 using a joint 38.2. The two joints 38.2 form a common pivot axis.

[0042] How Fig. As can be further seen in Figure 4, the floor section 33.1 is pivotally attached to floor joints 38.1. The two floor joints 38.1 form a common pivot axis, which preferably extends parallel to the floor section 33.1. To form the two floor joints 38.1, for example, a bend can be connected to the floor section 33.1, which forms a limiting section 33.2 as an anti-slip device. This limiting section 33.2 rises from the floor section 33.1. Facing away from the floor section 33.1, the limiting section merges into an inwardly directed bend. This bend stiffens the limiting section 33.2.

[0043] The limiting section 33.2 has bearing sections 33.21 that extend in the direction of the width of the platform extension 33. Bearing bolts are passed through the bearing receptacles of these bearing sections 33.21 and the bearing blocks aligned therewith, thus forming the floor joints 38.1.

[0044] Control levers 37 are arranged on opposite sides of the platform extension 33, spaced apart from the joint axis formed by the floor joints 38.1. The control levers 37 are each pivotably coupled to the securing section 36.1 and the floor section 33.1 via control joints 37.1, 37.2. For example, the arrangement can be such that the control lever 37 is connected in the area of ​​the bearing section 33.21 via the control joint 37.1. The second control joint 37.2 can be arranged in the area of ​​the connecting section 36.5. The two control joints 37.1 and the two control joints 37.2 each form a common pivot axis.

[0045] The arrangement of the joints 38.2, the floor joints 38.1 and the control joints 37.1, 37.2 can be seen more clearly in the Fig. 5. As this illustration shows, a joint 38.2, a floor joint 38.1 and two control joints 37.1, 37.2 form a four-joint system that creates a stable and pivotable association of the floor section 33 to the railing section 36.

[0046] Based on the Fig. 1 to 5, the platform extension 33 can be moved into a transport position. This transport position is shown in the Fig. 6 and Fig. 7 illustrates.

[0047] To move the platform extension 33 into the transport position, a user, for example, standing on the platform section 32, can grasp the railing section 36 at the handrail 36.2 and pull it upwards. During this movement, the railing section 36 pivots about the fixed pivot axis formed by the two joints 38.2. Since the railing section 36 is positively coupled to the floor section 33.1 via the two control levers 37, a moving force is introduced into the floor section 33.1. A torque is introduced via the eccentric assignment of the control joint 37.1 to the floor joint 38.1. This torque causes the floor section 33.1 to pivot from its folded-down position and into the Fig. 1 to 5 shown working position in the Fig. 6 and Fig. 7. The pivoting movement occurs via the stationary pivot axis formed by the two floor joints 38.1.

[0048] As the Fig. As can be seen from Figures 5 to 7, at least one of the control levers 37 has a stop 37.3. The pivoting movement can be limited by this stop 37.3. The stop 37.3 abuts a stationary component, in particular the bearing area in the region of the joint 38.2.

[0049] Preferably, a counter-stop is formed by the railing section 36 itself.

[0050] The opened and in the Fig. 6 and Fig. The transport position shown in Figure 7 can be locked by means of a positive connection, for example by means of a bolt or the like.

[0051] In the unfolded transport position, the base section 33.1 laterally covers the projection 24 and thus forms a lateral contact protection.

[0052] As the Fig. 6 and Fig. 7, the two blocking sections 36.6 are arranged in the transport position such that one blocking section 36.6 blocks access from the first platform section 32 and the second blocking section 36.6 blocks access from the second platform section 34 in the transport position. It is particularly preferred that the railing height formed between the handrail 36.2 and the securing section 36.1 essentially corresponds to the passage width of the platform sections 32, 34, as shown in Fig. 7 shows. A clearance area can be created between the handrail 36.2 and the barrier 24. However, this clearance area should only be large enough to prevent a user from moving through it.

[0053] Fig. 7 further shows that the strut 36.3 is also arranged above the projection 24.5 when the railing section 36 is pivoted in and thus forms a blockage which makes it even more difficult to climb over the projection 24.5.

[0054] In order to put the stage extension 33 back into the position in the Fig. To pivot the platform into the working position shown in Figures 1 to 5, simply loosen a locking device (e.g., a bolt) securing the transport position shown. Then, the railing section 36 can be grasped and the platform extension 33 can be pivoted out, so that the floor section 33.1 and the railing section 36 reach their folded-down working position. This folded-down working position can also be locked with appropriate stops and / or positive-locking connections, such as locking bolts or the like.

Claims

[1] Rock processing plant (10) with a processing unit (20) to which a walk-on work platform (30) is assigned, wherein the processing unit (20) has a projection (24.5) with which it projects into the working area formed by the working platform (30), wherein the working platform (30) has a fall protection device (35), in particular in the form of a railing, wherein the working platform (30) has a platform widening (33) in the region of the projection (24.5) in order to create a working area to the side of the projection (24.5), characterized by , that the platform extension (33) has a floor section (33.1) as a working surface, which is pivotally mounted in such a way that it can be folded or pivoted between a folded-down working position, in which the floor section (33.1) is accessible, and an erected transport position, that the fall protection device (35) is located in the area of ​​the stage extension (33), that at least one locking section (36.6) is directly or indirectly coupled to the base section (33.1) in such a way that when the base section (33.1) is adjusted, the locking section (36.6) is adjusted, wherein in the transport position the blocking section (36.6) blocks access to the projection (24.5) at least in some areas and in the working position the blocking section (36.6) is moved out of the access area (35.2). [2] Rock processing plant (10) according to claim 1, characterized by that the barrier section (36.6) or the barrier sections (36.6) is / are part of the fall protection device (35). [3] Rock processing plant (10) according to claim 2, characterized bythat the fall protection device (35) has a railing section (36) which is guided in the area of ​​the stage widening (33), that a further railing section (35.3, 35.4) adjoins the stage widening (33) on one side or on both sides, and that the railing section (36) of the stage widening (33) has the blocking section (36.6) and that this railing section (36) is pivotable relative to the adjoining further railing section(s) (35.3, 35.4). [4] Rock processing plant (10) according to one of claims 1 to 3, characterized by that the base section (33.1) in the erected transport position covers the projection (24.5) at least in part at the sides. [5] Rock processing plant (10) according to one of claims 1 to 4, characterized bythat the process unit (20) has a boundary (24) which limits the working platform (30) on the side facing away from the fall protection device (35), that the projection (24.5) projects from the boundary (24), and that the locking section (36.6) extends in the transport position between the boundary (24) and the erected floor section (33.1). [6] Rock processing plant (10) according to one of claims 1 to 5, characterized by that the fall protection device (35) has a handrail (36.2) which extends at least partially in the direction of the longitudinal extent of the floor section (33.1), and that the handrail (36.2) is arranged for pivotally mounting the floor section (33.1), preferably at least partially eccentrically to this, such that a force can be introduced via it in order to adjust the floor section (33.1) between the working position and the transport position. [7] Rock processing plant (10) according to one of claims 1 to 6, characterized by that the working platform (30) has two platform sections (32, 34), wherein the platform sections (32, 34) are transferred into one another by means of the platform widening (33), that the fall protection device (35) has two blocking sections (36.6), that the first blocking section (36.6) blocks access from the first platform section (32) in the transport position and the second blocking section (36.6) blocks access from the second platform section (34) in the transport position. [8] Rock processing plant (10) according to claim 7, characterized by that the two locking sections (36.6) are coupled to one another in such a way that they are adjusted simultaneously with one another when the base section (33.1) is adjusted from the working position to the transport position. [9] Rock processing plant (10) according to one of claims 1 to 8, characterized bythat a control lever (37) is coupled to the base section (33.1) via a control joint (37.1), that the control lever (37) is coupled directly or indirectly to the locking section (36.6) via a further control joint (37.2), and that the locking section (36.6) is pivotable about a pivot axis which is formed by a preferably stationary joint (38.2), wherein the further control joint (37.2) and the joint (38.2) are arranged at a distance from one another. [10] Rock processing plants (10) according to claim 9, characterized by that the base section (33.1) has a limiting section (33.2) which rises from the base section (33.1) in the working position, and that the control lever (37) is articulated to the limiting section (33.2) by means of the control joint (37.1). [11] Rock processing plant (10) according to one of claims 9 or 10, characterized bythat the base section (33.1) is pivotable about a horizontal rotation or pivot axis by means of at least one base joint (38.1), and that this base joint (38.1), the two control joints (37.1, 37.2) and the joint (38.2) form a four-joint system. [12] Rock processing plant (10) according to one of claims 1 to 11, characterized by that the / a railing section (36) has / a handrail (36.2) and, at a distance therefrom, a securing section (36.1), in particular a securing tube, wherein the securing section (36.1) extends at least partially in the same direction as the handrail (36.2), and that the handrail (36.2) and the securing section (36.1) are connected to one another by means of at least one strut (36.3) and / or by means of the locking section (36.6). [13] Rock processing plant (10) according to claim 12, characterized bythat the securing section (36.1) has connecting sections (36.5) in the region of its longitudinal ends, which extend in the direction of the depth of the stage widening (33), that in the region of the free ends of the connecting sections (36.5) bearing sections are formed, which form the joints (38.2) with a common axis of rotation about which the railing section (36) can be pivoted. [14] Rock processing plant (10) according to one of claims 1 to 10, characterized by that the working position and / or the transport position of the base section (33.1) is secured by means of a positive connection, for example a linch pin, a bolt or a stop connection.

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