Hydraulic System for Roller Crusher

Abstract

A hydraulic system for a roll crusher, comprising a first main cylinder connectable to a first movable support housing of the roll crusher, a second main cylinder connectable to a second movable support housing of the roll crusher, a first cross cylinder connectable to the first movable support housing of the roll crusher, and a second cross cylinder connectable to the second movable support housing of the roll crusher. A first compression chamber of the first cross cylinder is in fluid connection with a second rebound chamber of the second cross cylinder, and a first rebound chamber of the first cross cylinder is in fluid connection with a second compression chamber of the second cross cylinder.

Description

Technical Field

[0001] The present invention relates to a hydraulic system, and more particularly to a hydraulic system for a roll crusher. Background Art

[0002] A roll crusher is used to crush materials, such as ores. The crushing of the materials occurs between two rolls, which together define a crushing gap where the material to be crushed is introduced. The rolls are mounted in a machine frame by means of bearing housings. Each roll may be provided with one, two or more independent bearing housings. During the process of crushing the materials, continuously large forces are applied to the materials and thus to the rolls for crushing the materials. To ensure that the roll crusher is not damaged by these forces, one roll is mounted in a fixed bearing housing, i.e., a bearing housing fixed relative to the machine frame, and the other roll is mounted in a movable bearing housing, i.e., a bearing housing movable relative to the machine frame. Thus, the roll crusher includes a movable roll and a fixed roll. Thereby, when a large load is applied to the rolls, the movable roll can move away from the fixed roll, thereby enlarging the crushing gap and reducing the load. However, to ensure that the movable roll returns to its optimal crushing position and transmits sufficient crushing pressure during operation, a floating roller is biased towards the fixed roll by a hydraulic system. The hydraulic system biases the movable roll by transmitting a force to the movable bearing housing of the movable roll. However, since the movable bearing housings are independent of each other, the movement of the movable roll may cause skewing, i.e., the two rolls become non-parallel. For example, skewing may occur if the supply of the material is uneven when entering the crushing gap, or materials with different properties (such as water content) enter the crusher, or a tamp event occurs.

[0003] The skewing of the floating roll may endanger the seal, and in some cases where a flange is mounted on one of the rolls, the skewing may cause unnecessary contact between the roll and the flange. Therefore, it is difficult to use flanged rolls if there is a skewing problem. Summary of the Invention

[0004] The object of the present invention is to provide a solution for preventing or at least reducing skewing in a roll crusher, which solution is also flexible and easily applicable to various roll crushers.

[0005] According to a first aspect, this and other objects are achieved by a hydraulic system for a roll crusher, the roll crusher comprising a machine frame, a fixed roll supported by one or more fixed support housings, a movable roll supported by a first movable support housing and a second movable support housing, wherein the one or more fixed support housings are fixed relative to the machine frame, wherein the first movable support housing and the second movable support housing are movable relative to the machine frame, and wherein the fixed roll and the movable roll define a crushing gap for receiving the material to be crushed, the hydraulic system comprising:

[0006] A first main cylinder, connectable to the first movable support housing, and comprising a first main piston and a first main hydraulic chamber, the first main piston for applying a force along a first axis so as to generate a force on the first movable support housing, the first main hydraulic chamber for controlling the force applied by the first main piston;

[0007] A second main cylinder, connectable to the second movable support housing, and comprising a second main piston and a second main hydraulic chamber, the second main piston for applying a force along a second axis parallel to the first axis so as to generate a force on the second movable support housing, the second main hydraulic chamber for controlling the force applied by the second main piston;

[0008] A first crossing cylinder, connectable to the first movable support housing, and comprising a first synchronizing piston and a first synchronizing hydraulic chamber for applying a force along the first axis so as to generate a force on the first movable support housing, wherein the first synchronizing piston is operatively coupled to the first main piston, wherein the first synchronizing piston extends into the first synchronizing hydraulic chamber, and comprises a first synchronizing piston element separating the first synchronizing hydraulic chamber into a first compression chamber and a first rebound chamber;

[0009] A second crossing cylinder, connectable to the second movable support housing, and comprising a second synchronizing piston and a second synchronizing hydraulic chamber for applying a force along the second axis so as to generate a force on the second movable support housing, wherein the second synchronizing piston is operatively coupled to the second main piston, wherein the second synchronizing piston extends into the second synchronizing hydraulic chamber, and comprises a second synchronizing piston element separating the second synchronizing hydraulic chamber into a second compression chamber and a second rebound chamber; and wherein the first compression chamber is in fluid connection with the second rebound chamber, and the first rebound chamber is in fluid connection with the second compression chamber. Thereby, it is allowed to synchronize the movement of the first synchronizing piston and the second synchronizing piston of the first crossing cylinder and the second crossing cylinder.

[0010] Therefore, a hydraulic system is provided in which the movements of the first main piston and the second main piston are synchronized by operatively coupling the first cross cylinder and the second cross cylinder respectively. The movements of the synchronization pistons are synchronized by a first rebound chamber fluidly connected to the second compression chamber and a second rebound chamber fluidly connected to the first compression chamber. Thus, when the volume of the first rebound chamber is compressed, for example when the first synchronization piston moves along the first axis, fluid is transferred to the second compression chamber, which expands the volume of the second compression chamber, causing the second synchronization piston to move synchronously with the first synchronization piston. In addition, since the main pistons are operatively coupled to the synchronization pistons, the movements of these pistons are also synchronized. Synchronizing the movements between the pistons ensures that when the hydraulic system is connected to a roll crusher, the movements of the movable support housing are synchronized, thus avoiding tilting of the rolls. In addition, only the main cylinders need to contribute the crushing forces applied along the first axis and the second axis, while the synchronization cylinders only need to synchronize the movements of different pistons, which further simplifies the hydraulic wiring required for the hydraulic system.

[0011] The first synchronization hydraulic chamber and the second synchronization hydraulic chamber are preferably formed with the same dimensions, so that the volumes of the first compression chamber and the first rebound chamber respectively match the volumes of the second compression chamber and the second rebound chamber.

[0012] In the context of the present disclosure, when components are described as being operatively coupled, it should be understood that when the components are operated, they are coupled together.

[0013] In the context of the present disclosure, when components are described as being connected, it is not only interpreted as a direct connection between the components, but this connection can also be an indirect connection achieved through intermediate components.

[0014] In one embodiment, the first main hydraulic chamber is hollow and defines a first inner compartment, and the second main hydraulic chamber is hollow and defines a second inner compartment, wherein the first cross cylinder is arranged in the first inner compartment and the second cross cylinder is arranged in the second inner compartment.

[0015] Thus, a very space-saving arrangement is achieved between the main cylinders and the synchronization cylinders. In addition, arranging the synchronization cylinders at least partially within the main cylinders can further facilitate the operative coupling between the synchronization cylinders and the main cylinders.

[0016] In one embodiment, the first main hydraulic chamber occupies 60 - 90% of the area of the first cylinder, and the second main hydraulic chamber occupies 60 - 90% of the area of the second cylinder, where the area of the first cylinder is the cross-sectional area of the first main hydraulic chamber and the first inner compartment in a plane perpendicular to the first axis, and the area of the second cylinder is the cross-sectional area of the second main hydraulic chamber and the second inner compartment in a plane perpendicular to the second axis.

[0017] The applicant has found that by making the main hydraulic chamber occupy 60 - 90% of the cylinder area, compared with the traditional hydraulic systems currently installed on roll crushers, the hydraulic chamber does not need to increase in diameter to transmit sufficient force to the roll crusher. Therefore, it helps with the modification of the hydraulic system and minimizes the changes required in the manufacturing facilities for manufacturing roll crushers and hydraulic systems with the hydraulic system of the present invention.

[0018] In one embodiment, the fluid connection between the first compression chamber and the second rebound chamber forms a first closed fluid circuit, and the fluid connection between the first rebound chamber and the second compression chamber forms a second closed fluid circuit.

[0019] Therefore, since the operation of the cross cylinders will always be synchronized, the synchronization of the piston movement can be achieved autonomously without external control. This also further simplifies the hydraulic wiring required in the system. In some cases, a relief valve can be connected to the first closed fluid circuit and the second closed fluid circuit to achieve failsafe.

[0020] In one embodiment, the hydraulic system includes one or more hydraulic accumulators fluidly connected to the first main hydraulic chamber and / or the second main hydraulic chamber.

[0021] The hydraulic accumulator can help provide additional force to the main cylinder and / or stabilize the force transmitted by the main cylinder.

[0022] In one embodiment, the first synchronization piston and the first synchronization piston element are integrally connected, and the second synchronization piston and the second synchronization piston element are integrally connected.

[0023] Therefore, it can be ensured that the piston element does not move relative to the synchronization piston, thus ensuring that the movement of the synchronization piston is synchronized when the fluid moves between the rebound chamber and the compression chamber. Alternatively, the piston element can be provided as a seal for the synchronization piston. Providing the piston element as a seal can simplify the manufacture of the synchronization piston because the seal can be added to various pistons. In addition, the seal is inexpensive and easy to replace in case of wear and tear.

[0024] In one embodiment, the first cross cylinder engages with the first main cylinder to prevent the first cross cylinder from moving relative to the first main cylinder in a first plane perpendicular to the first axis, and / or the second cross cylinder engages with the second main cylinder to prevent the second cross cylinder from moving relative to the second main cylinder in a second plane perpendicular to the second axis.

[0025] During the operation of a roller crusher, there are significant forces that can cause vibrations or lateral forces, which may cause the cylinders to move relative to each other, potentially affecting the movement synchronization between the main pistons. Therefore, by preventing the movement of the cross cylinders relative to the main cylinders, these negative effects can be eliminated or at least reduced.

[0026] In one embodiment, the first main piston is connected to the first synchronization piston and / or the second main piston is connected to the second synchronization piston.

[0027] Accordingly, the main cylinders are allowed to be operatively coupled to the cross cylinders. By connecting the main pistons to the synchronization pistons together, it can be ensured that the movement of the main pistons is always synchronized by the cross cylinders. The connection between the main piston and the synchronization piston can be achieved by a bolt connection or a locking engagement, such as a male-female connection.

[0028] In one embodiment, the first main piston is integrally connected to the first synchronization piston, and / or the second main piston is integrally connected to the second synchronization piston.

[0029] An integral connection can ensure that the main cylinders and the synchronization cylinders are operatively coupled. The integral connection can be achieved by molding the main piston and the synchronization piston together, or by welding the main piston and the synchronization piston together.

[0030] In one embodiment, the first main piston is configured to transmit a force along a first axis to the first synchronization piston, and / or the second main piston is configured to transmit a force along a second axis to the second synchronization piston.

[0031] Accordingly, the main cylinders and the synchronization cylinders are allowed to be operatively coupled without forming a connection lock between the main piston and the synchronization piston. Not locking the main piston and the synchronization piston together can simplify the assembly and disassembly of the hydraulic system, which can prove to be particularly advantageous when installing the hydraulic system on a roller crusher.

[0032] According to a second aspect of the present invention, there is provided a roller crusher for crushing materials, the roller crusher comprising:

[0033] A machine frame;

[0034] A fixed roller, supported by a fixed support housing, wherein the fixed support housing is fixed relative to the machine frame;

[0035] A movable roll, supported by a movable support housing, wherein the movable support housing is movable relative to the machine frame, wherein the fixed roll and the movable roll define a crushing gap for receiving the material to be crushed; and a hydraulic system according to a first aspect of the present invention, wherein the hydraulic system is configured to transmit a force to the movable support housing to bias the movable roll towards the fixed roll.

[0036] The different aspects of the present invention can be implemented in the different ways described above and below, each of which gives rise to one or more benefits and advantages described in connection with at least one of the above aspects, and each of which has one or more preferred embodiments corresponding to the preferred embodiments described in connection with at least one of the above aspects.

[0037] Furthermore, it should be understood that the embodiments described in connection with one of the aspects herein can equally be applied to the other aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Referring to the accompanying drawings, the above and / or additional objects, features and advantages of the present invention will be further illustrated by the following illustrative and non-limiting detailed description of embodiments of the present invention, in which:

[0039] Figure 1 A schematic cross-sectional view of an embodiment of a roll crusher according to a second aspect of the present invention is shown.

[0040] Figure 2 A schematic cross-sectional view of an embodiment of a hydraulic system according to a first aspect of the present invention, which is connected to the movable support housing of the roll crusher, is shown.

[0041] Figure 3a A schematic cross-sectional view of a first main cylinder according to an embodiment of the present invention is shown.

[0042] Figure 3b Shows Figure 3a A schematic top view of the first main cylinder of

[0043] Figure 4a A schematic cross-sectional view of a first cross cylinder according to an embodiment of the present invention is shown.

[0044] Figure 4b Shows Figure 4a A schematic top view of the first cross cylinder of DETAILED DESCRIPTION

[0045] The present invention will now be described more fully with reference to the accompanying drawings, in which the presently preferred embodiments of the invention are shown. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to convey the scope of the invention to those skilled in the art.

[0046] First, refer to Figure 1 , which shows a schematic cross-sectional view of an embodiment of a roll crusher 2 according to a second aspect of the present invention. The roll crusher 2 is used for crushing materials, such as ores. The roll crusher 2 includes a machine frame 21 that supports two rolls 22 and 23 of the roll crusher. The two rolls 22 and 23 are a fixed roll 23 and a movable roll 22. The fixed roll 23 is supported by a fixed support housing 25. The fixed support housing 25 is placed on the machine frame 21. The fixed support housing 25 is fixed relative to the machine frame 21. The movable roll 22 is supported by two movable support housings 241 and 242, namely a first movable support housing 241 and a second movable support housing 242. The two movable support housings 241 and 242 are movable relative to the machine frame 21. The first movable support housing 241 is movable along a first axis A1, and the second movable support housing 242 is movable along a second axis A2. In the illustrated embodiment, the first axis A1 is parallel to the second axis A2. The fixed roll 23 and the movable roll 22 define a crushing gap 26 for receiving the material to be crushed. Connected to the two movable support housings 241 and 242 is a hydraulic system 1. The hydraulic system 1 is configured to transmit a force to the movable support housings 241 and 242 to bias the movable roll 22 towards the fixed roll 23. During operation, the movable roll 22 can move along the first axis A1 and the second axis A2 to increase or decrease the crushing gap 26 between the fixed roll 23 and the movable roll 22. The hydraulic system 1 will be described in more detail in the following drawings.

[0047] Refer to Figure 2, which shows a schematic cross-sectional view of an embodiment of a hydraulic system 1 according to a first aspect of the present invention, the hydraulic system 1 being connected to the movable support housings 241 and 242 of a roll crusher 2. The hydraulic system 1 includes a first main cylinder 11 and a second main cylinder 13. The first main cylinder 11 and the second main cylinder 13 are indirectly connected to the first movable support housing 241 and the second movable support housing 242 respectively. The indirect connection of the first main cylinder 11 is achieved through a first synchronization piston 122, and the indirect connection of the second main cylinder 13 is achieved through a second synchronization piston 142. The first synchronization piston 122 and the second synchronization piston 142 abut the first movable support housing 241 and the second movable support housing respectively. Alternatively, the first main cylinder 11 and the second main cylinder 13 can be directly connected to the first movable support housing 241 and the second movable support housing 242 respectively. The connection between the first movable support housing 241 and the first main cylinder 11 ensures that when the first main cylinder 11 generates a force along the first axis A1 towards the first movable roll 241, a force is generated on the first movable support housing 241. The connection between the second movable support housing 242 and the second main cylinder 13 ensures that when the second main cylinder 13 generates a force along the second axis A2 towards the second movable roll 242, a force is generated on the second movable support housing 242. The first main cylinder 11 and the second main cylinder 13 each include a first main piston 111 and a second main piston 131 respectively. The first main piston 111 and the second main piston move along the first axis A1 and the second axis A2 respectively. The first main piston 111 is used to apply a force along the first axis A1, thereby generating a force on the first movable support housing 241. The second main piston 131 is used to apply a force along the second axis A2, thereby generating a force on the second movable support housing 242. The first main cylinder 11 and the second main cylinder 13 further include a first main hydraulic chamber 112 for controlling the force applied by the first main piston 111 and a second main hydraulic chamber 132 for controlling the force applied by the second main piston 131. The first main hydraulic chamber 112 and the second main hydraulic chamber are configured to accommodate pressurized fluid. The pressurized fluid in the first main hydraulic chamber 112 is configured to transfer the fluid force to the first main piston 111, such that the first main piston 111 transfers the force to the first movable support housing 241. The pressurized fluid in the second main hydraulic chamber 132 is configured to transfer the fluid force to the second main piston 131, such that the second main piston 131 transfers the force to the second movable support housing 242. In the illustrated embodiment, the fluid and fluid pressure in the first main hydraulic chamber 112 and the second main hydraulic chamber 132 can be controlled through a first hydraulic line 113 and a second hydraulic line 133 respectively. The first hydraulic line 113 fluidly connects the first main hydraulic chamber 112 to a controller 15, and the second hydraulic line 133 fluidly connects the second main hydraulic chamber 132 to the controller 15. The controller 15 can control the fluid and fluid pressure in the first main hydraulic chamber 112 and the second main hydraulic chamber 132.The controller 15 can control the fluid and fluid pressure through the hydraulic device 16, such as one or more pumps and / or one or more accumulators fluidly connected to the first hydraulic line 113 and the second hydraulic line 133. In other embodiments, the first main hydraulic chamber 112 and / or the second main hydraulic chamber 132 are pressurized and fluidly sealed, thereby allowing the first main cylinder 11 and / or the second main cylinder 13 to respectively provide a constant force to the first movable support housing 241 and / or the second movable support housing 242.

[0048] The hydraulic system 1 further includes a first cross cylinder 12 and a second cross cylinder 14 respectively connected to the first movable support housing 241 and the second movable support housing 242. In the illustrated embodiment, the first cross cylinder 12 and the second cross cylinder 14 are directly connected to the first movable support housing 241 and the second movable support housing 242 respectively. Alternatively, the first cross cylinder 12 and / or the second cross cylinder may be indirectly connected to the first movable support housing 241 and / or the second movable support housing 242 respectively. The indirect connection can be achieved through a shim or the main pistons 111 and 131. The first cross cylinder 12 includes a first synchronous hydraulic chamber 121 and a first synchronous piston 122. The second cross cylinder 14 includes a second synchronous hydraulic chamber 141 and a second synchronous piston 142. The first synchronous piston 122 and the second synchronous piston 142 move along the first axis A1 and the second axis A2 respectively. The first synchronous piston 122 abuts against the first movable support housing 241, thereby forming a connection between the first cross cylinder 12 and the first movable support housing 241. The first synchronous piston 122 is configured to apply a force along the first axis A1, thereby generating a force on the first movable support housing 241. The second synchronous piston 142 abuts against the second movable support housing 242, thereby forming a connection between the second cross cylinder 14 and the second movable support housing 242. The second synchronous piston 142 is configured to apply a force along the second axis A2, thereby generating a force on the second movable support housing 242. The first synchronous piston 122 and the second synchronous piston 142 are operatively coupled to the first main piston 111 and the second main piston 131 respectively. In the illustrated embodiment, the operative coupling is achieved through the main pistons 111 and 131, which are configured to transfer the force along the first axis A1 and the second axis A2 to the synchronous pistons 122 and 142. In the illustrated embodiment, this is achieved by the first main piston 111 and the second main piston 131 directly abutting against the first synchronous piston 122 and the second synchronous piston 142 respectively. Alternatively, a shim or the like can be placed between the main pistons 111 and 131 and the synchronous pistons 122 and 142. Alternatively, the operative coupling can be achieved by connecting the main pistons 111 and 131 to the synchronous pistons 122 and 142 by bolt connection or welding. This operative coupling helps the movement of the main pistons 111 and 131 to be synchronized with the movement of the synchronous pistons 122 and 142. For example, when a high load is generated by the material in the crushing gap 26, the operative coupling ensures that the main pistons 111 and 131 move synchronously with the synchronous pistons 122 and 142. The first synchronous piston 122 and the second synchronous piston 142 extend into the first synchronous hydraulic chamber 121 and the second synchronous hydraulic chamber 141 respectively. The first synchronous piston 122 and the second synchronous piston 142 respectively include a first synchronous piston element 123 and a second synchronous piston element 143. The first synchronous piston element 123 separates the first synchronous hydraulic chamber 121 into a first compression chamber 124 and a first rebound chamber 125.The second main piston element 143 separates the second synchronization hydraulic chamber 141 into a second compression chamber 144 and a second rebound chamber 145. Thus, when the first synchronization piston 122 moves along the first axis A1, the first synchronization piston element 123 also moves along the first axis A1. The movement of the first synchronization piston element 123 along the first axis A1 changes the volumes of the first compression chamber 124 and the first rebound chamber 125. When the second synchronization piston 142 moves along the second axis A2, the second synchronization piston element 143 also moves along the second axis A2. The movement of the second synchronization piston element 143 along the second axis A2 changes the volumes of the second compression chamber 144 and the second rebound chamber 145.

[0049] In the illustrated embodiment, the first cross cylinder 12 and the second cross cylinder 14 have the same structure. However, the first cross cylinder 12 and the second cross cylinder 14 may also be different from each other in structure.

[0050] The first compression chamber 124 is fluidly connected to the second rebound chamber 145 through a first fluid connection 17. The first rebound chamber 125 is fluidly connected to the second compression chamber 144 through a first fluid connection 18. The fluid connections between the compression chambers 124 and 144 and the rebound chambers 125 and 145 synchronize the movements of the first synchronization piston 122 and the second synchronization piston 142. The movements of the first synchronization piston 122 and the second synchronization piston 142 are synchronized through the fluid connections between the compression chambers 124 and 144 and the rebound chambers 125 and 145, maintaining a constant volume ratio between the volumes of the first rebound chamber 125 and the second compression chamber 144 and the volumes of the second rebound chamber 145 and the first compression chamber 124. This constant volume ratio ensures that the first synchronization piston 122 and the second synchronization piston 142 move synchronously with each other. Thus, when the first compression chamber 124 is compressed due to the movement of the first synchronization piston 122, fluid is transferred from the first compression chamber 124 to the second rebound chamber 145, thereby expanding the second rebound chamber 145 and causing the compression of the second compression chamber 144, such that the second synchronization piston 142 moves synchronously with the first synchronization piston 122. Therefore, the fluid connections between the compression chambers 124 and 144 and the rebound chambers 125 and 145 ensure that the synchronization pistons 122 and 142 move synchronously with each other. In the illustrated embodiment, the first fluid connection 17 between the first compression chamber 124 and the second rebound chamber 145 forms a first closed fluid circuit, and the second fluid connection 18 between the first rebound chamber 125 and the second compression chamber 144 forms a second closed fluid circuit.

[0051] Reference Figure 3a and Figure 3b where Figure 3a shows a schematic cross-sectional view of a first master cylinder 11 according to an embodiment of the present invention, Figure 3b shows Figure 3aSchematic top view of the first master cylinder 11. The following descriptions of the first master cylinder 11 and the first crossover cylinder 12 are equally applicable to the second master cylinder 13 and the second crossover cylinder 14, respectively. The first master cylinder 11 is hollow and defines a first inner cavity 114. The first inner cavity 114 is configured to receive the first crossover cylinder 12. The cross-section of the first master cylinder 11 in a plane perpendicular to the first axis A1 is substantially formed as a hollow cylinder, and its hydraulic chamber 112 defines the outer diameter and the inner diameter of the hollow cylinder, and the first inner cavity 114 is located at the center of the hollow cylinder. The first main hydraulic chamber 112 occupies 60 - 90% of the first cylinder area, where the first cylinder area is the cross-sectional area of the first main hydraulic chamber 112 and the first inner cavity 114 in a plane perpendicular to the first axis A1. In addition, an annular groove 115 is formed in the first master cylinder 11. The annular groove 115 can contribute to a locking engagement between the first crossover cylinder 12 received in the first inner cavity 15 and the master cylinder 11. This locking engagement can be achieved by providing one or more protrusions 126 on the first crossover cylinder 12, which match the locking groove 115, so that one or more protrusions 126 of the first crossover cylinder 12 can engage the annular groove 115 of the first master cylinder 11. The locking engagement between the one or more protrusions 126 and the annular groove 115 can prevent the first crossover cylinder 12 and the first master cylinder 11 from moving relative to each other. The annular groove 115 is formed in the first main hydraulic chamber 112. The first master piston 111 is formed with a cross-section that is substantially L-shaped in a plane parallel to the first axis A1.

[0052] Reference Figure 4a and Figure 4b , where Figure 4a shows a schematic cross-sectional view of the first crossover cylinder 12 according to an embodiment of the present invention, Figure 4b shows Figure 4a a schematic top view of the first crossover cylinder 12. The following descriptions of the first crossover cylinder 12 and the first master cylinder 11 are equally applicable to the second crossover cylinder 14 and the second master cylinder 13, respectively. The first crossover cylinder 12 includes a first synchronous hydraulic chamber 121 and a first synchronous piston 122. The first synchronous piston 122 further includes a first synchronous piston element 123. The first synchronous piston element 123 is formed as a protrusion on the first synchronous piston 122. Alternatively, the first synchronous piston element 123 can be provided as a seal or the like. The first synchronous piston element 123 is configured to move along the first axis A1 together with the first synchronous piston 122. The first synchronous piston element 123 separates the first synchronous hydraulic chamber 121 into a first compression chamber 124 and a first rebound chamber 125. When the first synchronous piston element 123 moves along the first axis A1 together with the first synchronous piston 122, the volumes of the first compression chamber 124 and the first rebound chamber 125 change accordingly. As Figure 4bAs shown, when viewed from the support housing, the first synchronizing piston 122 is substantially circular. The first synchronizing hydraulic chamber 121 has a substantially circular cross-section in a plane perpendicular to the first axis A1. The first synchronizing hydraulic chamber 121 has a protrusion 126. The protrusion 126 is formed as a circular flange extending around the circumference of the first synchronizing hydraulic chamber 121. The protrusion 126 is configured to serve as a male connector that can engage a corresponding female connector on the first master cylinder 12.

[0053] Although some embodiments have been described and illustrated in detail, the present invention is not limited to these embodiments and can be implemented in other ways. Specifically, it should be understood that other embodiments can be utilized and structural and functional modifications can be made without departing from the scope of the present invention.

[0054] Several of the means recited above can be implemented by one and the same item of hardware. The fact that certain measures are described in different embodiments or preferred embodiments does not indicate that a combination of these measures cannot be advantageous.

[0055] It should be emphasized that when the terms "comprising / including" are used in this specification, they are used to specify the presence of the stated features, integers, steps or components, but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

Claims

1. A hydraulic system for a roll crusher, the roll crusher comprising a machine frame, a fixed roll supported by one or more fixed support housings fixed relative to the machine frame, and a movable roll supported by a first movable support housing and a second movable support housing movable relative to the machine frame, wherein the fixed roll and the movable roll define a crushing gap for receiving material to be crushed, the hydraulic system comprising: A first main cylinder connectable to the first movable support housing and including a first main piston and a first main hydraulic chamber, the first main piston for applying a force along a first axis to thereby generate a force on the first movable support housing, the first main hydraulic chamber for controlling the force applied by the first main piston; A second main cylinder connectable to the second movable support housing and including a second main piston and a second main hydraulic chamber, the second main piston for applying a force along a second axis parallel to the first axis to thereby generate a force on the second movable support housing, the second main hydraulic chamber for controlling the force applied by the second main piston; A first cross cylinder connectable to the first movable support housing and operatively coupled to the first main piston, the first cross cylinder including a first synchronizing piston and a first synchronizing hydraulic chamber for applying a force along the first axis to thereby generate a force on the first movable support housing, wherein the first synchronizing piston extends into the first synchronizing hydraulic chamber and includes a first synchronizing piston element separating the first synchronizing hydraulic chamber into a first compression chamber and a first rebound chamber; And A second cross cylinder connectable to the second movable support housing and operatively coupled to the second main piston, the second cross cylinder including a second synchronizing piston and a second synchronizing hydraulic chamber for applying a force along the second axis to thereby generate a force on the second movable support housing, wherein the second synchronizing piston extends into the second synchronizing hydraulic chamber and includes a second synchronizing piston element separating the second synchronizing hydraulic chamber into a second compression chamber and a second rebound chamber, and wherein the first compression chamber is in fluid connection with the second rebound chamber, and the first rebound chamber is in fluid connection with the second compression chamber, wherein the first main hydraulic chamber is hollow and defines a first inner cavity, the second main hydraulic chamber is hollow and defines a second inner cavity, the first cross cylinder is disposed in the first inner cavity, and the second cross cylinder is disposed in the second inner cavity.

2. The hydraulic system according to claim 1, wherein, The first main hydraulic chamber occupies 60 - 90% of a first cylinder area, and the second main hydraulic chamber occupies 60 - 90% of a second cylinder area, wherein the first cylinder area is the cross-sectional area of the first main hydraulic chamber and the first inner cavity, and the second cylinder area is the cross-sectional area of the second main hydraulic chamber and the second inner cavity.

3. The hydraulic system according to claim 1 or 2, wherein, The fluid connection between the first compression chamber and the second rebound chamber forms a first closed fluid circuit, and the fluid connection between the first rebound chamber and the second compression chamber forms a second closed fluid circuit.

4. The hydraulic system according to claim 1 or 2 further includes one or more hydraulic accumulators fluidly connected to the first main hydraulic chamber and / or the second main hydraulic chamber.

5. The hydraulic system according to claim 1 or 2, wherein, The first synchronization piston and the first synchronization piston element are integrally connected, and the second synchronization piston and the second synchronization piston element are integrally connected.

6. The hydraulic system according to claim 1 or 2, wherein The first cross cylinder engages with the first main cylinder to prevent the first cross cylinder from moving relative to the first main cylinder in a first plane perpendicular to the first axis, and / or the second cross cylinder engages with the second main cylinder to prevent the second cross cylinder from moving relative to the second main cylinder in a second plane perpendicular to the second axis.

7. The hydraulic system according to claim 1 or 2, wherein, The first main piston is connected to the first synchronization piston, and / or the second main piston is connected to the second synchronization piston.

8. The hydraulic system according to claim 7 above, wherein, The first main piston is integrally connected to the first synchronization piston, and / or the second main piston is integrally connected to the second synchronization piston.

9. The hydraulic system according to claim 1 or 2, wherein The first main piston is configured to transmit a force along the first axis to the first synchronization piston, and / or the second main piston is configured to transmit a force along the second axis to the second synchronization piston.

10. A roll crusher for crushing materials, comprising: a machine frame; a fixed roll supported by a fixed support housing, wherein the fixed support housing is fixed relative to the machine frame; a movable roll supported by a movable support housing, wherein the movable support housing is movable relative to the machine frame, wherein the fixed roll and the movable roll define a crushing gap for receiving the material to be crushed, and the hydraulic system according to any one of claims 1-9, wherein the hydraulic system is configured to transmit a force to the movable support housing to bias the movable roll towards the fixed roll.

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