Hydraulic pressing system of resonance crushing device and crushing method

Abstract

The invention relates to the technical field of engineering machinery, and discloses a hydraulic pressing system of a resonance crushing device and a crushing method. The two-linkage proportional multi-way valve is used for obtaining oil from the metering pump, supplying oil to the two piston cylinders and controlling the two piston cylinders to stretch out and draw back; the two proportional overflow valves are respectively arranged in rod cavities of the two piston cylinders; the controller is in signal connection with the two proportional multi-way valves and the two proportional overflow valves and controls the two proportional multi-way valves and the two proportional overflow valves; and the controller is used for adjusting the magnitude of an input electric signal of the two-linkage proportional multi-way valve so as to control the pressing speed of the resonance crushing device, and is also used for adjusting the magnitude of an input electric signal of the proportional overflow valve so as to adjust the pressing force of the resonance crushing device. According to the hydraulic pressing system and the crushing method, the pressing force and the downward pressing speed of the resonance crushing device can be effectively and accurately controlled, and the crushing quality and the crushing efficiency of a hit object can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a hydraulic pressing system and a crushing method of a resonance crushing device. Background Art

[0002] At present, the resonant crushing device relies on three eccentric blocks arranged in the vertical direction to rotate at high speed to generate a high-frequency excitation force that reciprocates up and down to crush the objects to be struck. During the continuous excitation operation, the resonant crushing device generally requires a clamping force to press it against the surface of the object to be struck, and as the longitudinal displacement of the strike deepens, the clamping force should continue to act to avoid air vibration.

[0003] In the related art, the hydraulic clamping system of the traditional resonant crushing device generally adopts a hydraulic cylinder connected to the crushing device. The continuous extension or retraction of the hydraulic cylinder drives the crushing device to move continuously along the impact depth, thereby achieving the compression of the crushing device and the impacted object. The cylinder is generally controlled by an ordinary three-position four-way electromagnetic reversing valve to control the extension and retraction, and mostly relies on the operator's experience to perform inching.

[0004] However, different objects have different characteristics (mainly referring to the natural frequency, which is related to the material, hardness, width, thickness, etc.). The pressing force and downward speed during the movement of the cylinder are not effectively differentiated and controlled for objects with different characteristics. As a result, the entire device cannot accurately control the composite action process of compacting and crushing with high frequency resonance, which in turn affects the crushing quality and efficiency of the objects. For example, some occasions require that the objects be crushed quickly and have strict requirements on the distribution of the crushed particle size. Summary of the Invention

[0005] The present application provides a hydraulic pressing system and crushing method for a resonant crushing device, which can effectively and accurately control the pressing force and downward pressing speed of the resonant crushing device, thereby helping to improve the crushing quality and crushing efficiency of the struck object.

[0006] In a first aspect, an embodiment of the present application provides a hydraulic pressing system for a resonance crushing device, comprising:

[0007] Two piston cylinders, the cylinder barrels of the two piston cylinders are fixedly connected to the resonance crushing device through a mechanical structure, and the cylinder rods of the piston cylinders are fixed;

[0008] A two-way proportional multi-way valve, which obtains oil from a metering pump, supplies oil to two piston cylinders and controls the telescopic movement of the two piston cylinders;

[0009] Two proportional relief valves are respectively arranged in the rod chambers of the two piston cylinders;

[0010] A controller, whose signals connect and control the two-way proportional multi-way valve and the two proportional relief valves; the controller is used to adjust the size of the input electrical signals of the two-way proportional multi-way valves to control the downward pressure speed of the resonant crushing device, and is also used to adjust the size of the input electrical signals of the proportional relief valves to adjust the pressing force of the resonant crushing device.

[0011] In combination with the first aspect, in one embodiment, the two links of the two-link proportional multi-way valve are respectively connected to the two piston cylinders, and each link includes a port A and a port B, the port A is connected to the rodless cavity of the piston cylinder, and the port B is connected to the rod cavity of the piston cylinder;

[0012] The controller adjusts the infusion direction and infusion opening of the two cavities of the piston cylinder through the A port and the B port of each link of the two-link proportional multi-way valve.

[0013] In combination with the first aspect, in one embodiment, the hydraulic pressing system further includes a slide rail, and the resonance crushing device moves up and down along the slide rail under the action of two piston cylinders to impact the object to be struck.

[0014] In combination with the first aspect, in one embodiment, both piston cylinders are provided with displacement sensors, and the signals of both displacement sensors are connected to the controller; when the displacement difference of the monitoring data obtained by the controller from the two displacement sensors exceeds a set threshold, the input electrical signal size of the corresponding link in the two-link proportional multi-way valve is adjusted to maintain displacement synchronization.

[0015] In combination with the first aspect, in one embodiment, the hydraulic pressing system further includes two double-balancing valves, and the two parts of each double-balancing valve are respectively arranged to be connected to the two chambers of the piston cylinder.

[0016] In combination with the first aspect, in one embodiment, each cavity of each piston cylinder is provided with a pressure sensor or a pressure measuring joint, and the pressure sensor or the pressure measuring joint signal is connected to the controller;

[0017] The controller adjusts the oil pressure of the rod chamber through a proportional relief valve, obtains the oil pressure of the two chambers of the cylinder through a pressure sensor or a pressure measuring joint, and adjusts the actual pressing force in combination with the known effective area of ​​the two chambers.

[0018] In combination with the first aspect, in one embodiment, the hydraulic clamping system further includes a high-pressure accumulator and a low-pressure accumulator; the high-pressure accumulator is connected to the rod chambers of the two piston cylinders through a pipeline, and the low-pressure accumulator is connected to the rodless chambers of the two piston cylinders through a pipeline.

[0019] In a second aspect, an embodiment of the present application provides a crushing method based on the above-mentioned hydraulic compaction system, comprising the steps of:

[0020] The controller divides the input electrical signal of the proportional relief valve into multiple levels, corresponding to several levels of pressing force of the resonance crushing device;

[0021] At each level of compaction force, the controller gradually changes the input electrical signal of the two-way proportional multi-valve to adjust the downward pressure speed of the resonance crushing device;

[0022] Conduct multiple crushing tests on the objects of the experimental sample to find the optimal combination of compaction force and downward pressure speed, which satisfies the requirement that the object 15 be crushed in the shortest possible time and that the particle size distribution after crushing meets the set requirements;

[0023] The remaining objects to be crushed are crushed using the optimal combination of compaction force and downward pressure speed.

[0024] In conjunction with the second aspect, in one embodiment, the hydraulic pressing system further includes a slide rail, and the resonant crushing device moves up and down along the slide rail under the action of two piston cylinders; the two piston cylinders are both provided with displacement sensors, and the signals of the two displacement sensors are both connected to the controller;

[0025] During the crushing test, when the displacement difference of the monitoring data obtained by the controller from the two displacement sensors exceeds the set threshold, the input electrical signal size of the corresponding link in the two-link proportional multi-way valve is adjusted to keep the displacement of the two piston cylinders synchronized.

[0026] In conjunction with the second aspect, in one embodiment, each cavity of each piston cylinder is provided with a pressure sensor or a pressure measuring joint, and the pressure sensor or the pressure measuring joint is connected to the controller by signal;

[0027] The controller adjusts the oil pressure of the rod chamber through a proportional relief valve, obtains the oil pressure of the two chambers of the cylinder through a pressure sensor or a pressure measuring joint, and adjusts the actual pressing force in combination with the known effective area of ​​the two chambers.

[0028] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0029] 1. The hydraulic clamping system of the present application is connected to the two-way proportional multi-way valve and the two proportional relief valves by the controller signal, which controls the size of the input electrical signal of the two-way proportional multi-way valve and thus controls the downward pressure speed of the resonant crushing device, and controls the size of the input electrical signal of the proportional relief valve and thus adjusts the clamping force of the resonant crushing device. By matching different clamping forces and downward pressure speeds, the optimal combination of clamping force and downward pressure speed is sought on the objects to be struck (small area or small volume) of the experimental sample for different characteristics of the objects to be struck, so as to obtain the optimal resonant crushing quality and crushing efficiency, and thus the objects to be crushed (large area or large volume) can be crushed efficiently and with high quality.

[0030] 2. The crushing method of the hydraulic clamping system of the present application is divided into several levels of clamping force. Under each level of clamping force, the controller gradually changes the input electrical signal size of the two-way proportional multi-way valve to adjust the downward pressure speed of the resonant crushing device. Multiple groups of experiments are repeated to find the optimal combination of clamping force and downward pressure speed for the object to be struck. The optimal combination of clamping force and downward pressure speed satisfies the requirements that the object to be struck is crushed in the shortest time and the particle size distribution after crushing meets the set requirements. The optimal combination of clamping force and downward pressure speed is found for the object to be struck (small area or small volume) of the experimental sample, and the optimal combination of clamping force and downward pressure speed is applied to the remaining objects to be crushed (large area or large volume) to obtain the optimal resonant crushing quality and crushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A schematic diagram of a hydraulic pressing system provided in an embodiment of the present application;

[0033] In the figure: 1. Oil tank; 2. Dosing pump; 3. Two-way proportional multi-way valve; 4. Pressure gauge; 5. Pressure sensor; 6. Proportional relief valve; 7. Double balancing valve; 8. High-pressure accumulator; 9. Low-pressure accumulator; 10. Pressure measuring joint; 11. Piston cylinder; 12. Displacement sensor; 13. Slide rail; 14. Resonance crushing device; 15. Object to be struck; 111. Cylinder barrel; 112. Cylinder rod; 113. Rod chamber; 114. Rodless chamber. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In the existing hydraulic clamping system, for objects with different characteristics, the clamping force and downward pressing speed during the movement of the cylinder are basically the same, and the composite action process of the entire device compacting and crushing with high frequency resonance cannot be accurately controlled; the hydraulic clamping system of the present application can effectively and accurately control the clamping force and downward pressing speed of the resonance crushing device, which helps to improve the crushing quality and crushing efficiency of the objects.

[0036] like Figure 1 As shown, the present application discloses an embodiment of a hydraulic pressing system of a resonance crushing device, the hydraulic pressing system comprising a metering pump 2, two piston cylinders 11, a two-way proportional multi-way valve 3, two proportional relief valves 6 and a controller.

[0037] The metering pump 2 is used to draw oil from the oil tank 1 and deliver oil to the two-way proportional multi-way valve 3 .

[0038] The cylinder barrels 111 of the two piston cylinders 11 are mechanically fixed to the resonant crushing device 14. The cylinder rods 112 of the piston cylinders 11 are stationary. The two cylinder barrels 111 move synchronously, driving the resonant crushing device 14 up and down. The cylinder barrels 111 of the piston cylinder 11 extend relative to the cylinder rod 112, driving the resonant crushing device 14 upward and away from the surface of the object 15. The cylinder barrels 111 of the piston cylinder 11 retract relative to the cylinder rod 112, driving the resonant crushing device 14 downward onto the surface of the object 15. The resonant crushing device 14 operates in a resonant crushing mode, vibrating at high frequencies as it presses downward, thereby crushing the object 15.

[0039] The two-way proportional multi-way valve 3 obtains oil from the metering pump 2, supplies oil to the two piston cylinders 11, and controls the telescopic movement of the two piston cylinders 11.

[0040] Two proportional relief valves 6 are installed in the rod chambers 113 of the two piston cylinders 11. The rod chambers 113 are high-pressure chambers, while the rodless chambers 114 are low-pressure chambers. Specifically, the proportional relief valves 6 are connected to the rod chambers 113 of the piston cylinders 11 via pipelines, forming a relief pressure-regulating circuit to regulate oil pressure.

[0041] The controller signals connect the two-way proportional multi-way valve 3 and the two proportional relief valves 6. By inputting electrical signals of varying magnitude into the two-way proportional multi-way valve 3 and the two proportional relief valves 6, the controller controls the direction (corresponding to the lifting and lowering) and opening (corresponding to the lifting and lowering speed) of the two-way proportional multi-way valve 3, as well as the overflow opening (corresponding to the oil pressure, i.e., the clamping force) of the proportional relief valve 6. Specifically, the controller is used to adjust the magnitude of the electrical signal input to the two-way proportional multi-way valve 3 to control the downward pressure speed of the resonant crushing device 14, and also to adjust the magnitude of the electrical signal input to the proportional relief valve 6 to adjust the clamping force of the resonant crushing device 14.

[0042] Specifically, regarding the lifting speed, this application only focuses on the downward speed and does not focus on the upward speed.

[0043] Specifically, there are three main indicators of resonant crushing operation, namely resonance, compaction force and downward pressing speed. This application mainly explains the following two indicators (compaction force and downward pressing speed) and does not elaborate on resonance.

[0044] Specifically, the controller can adjust the retraction speed of the oil cylinder by adjusting the input electrical signal size of the proportional multi-way valve 3 (retraction corresponds to Figure 1 The retraction force of the oil cylinder can be adjusted by adjusting the input electrical signal of the proportional relief valve 6. Since the oil cylinder rod 112 is fixed, the retraction of the piston cylinder 11 will cause the oil cylinder barrel 111 to drive the resonance crushing device 14 to press on the surface of the object 15. The retraction force is equal to the pressing force applied by the resonance crushing device 14 to the object 15, and the retraction speed is equal to the downward pressing speed of the resonance crushing device 14.

[0045] In the hydraulic clamping system of the present application, the controller signal connects the two-way proportional multi-way valve 3 and the two proportional relief valves 6, controls the size of the input electrical signal of the two-way proportional multi-way valve 3 and thus controls the downward pressure speed of the resonance crushing device 14, controls the size of the input electrical signal of the proportional relief valve 6 and thus adjusts the clamping force of the resonance crushing device 14, and by matching different clamping forces and downward pressure speeds, seeks the optimal combination of clamping force and downward pressure speed on the object 15 (small area or small volume) of the experimental sample for the object 15 with different characteristics, so as to obtain the optimal resonance crushing quality and crushing efficiency, and then performs efficient and high-quality crushing on the object 15 (large area or large volume) to be crushed.

[0046] Specifically, in one example, the optimal indicator uses the shortest time and particle size distribution to meet the requirements. For example, the particle size is required to be between 5 and 10 mm, accounting for more than 80%. The combination of compaction force and downward pressing speed is the optimal one when the particle size after crushing is between 5 and 10 mm, accounting for more than 80%.

[0047] Furthermore, in one embodiment, the two links of the two-link proportional multi-way valve 3 are respectively connected to the two piston cylinders 11, and each link includes port A and port B, port A is connected to the rodless cavity 114 of the piston cylinder 11, and port B is connected to the rod cavity 114 of the piston cylinder 11.

[0048] The controller changes the infusion direction and infusion opening of the two cavities of the piston cylinder 11 through the A port and the B port of each link of the two-link proportional multi-way valve 3, thereby controlling the extension or retraction of the cylinder 111 relative to the cylinder rod 112 and the corresponding extension and retraction speed.

[0049] Specifically, if Figure 1 As shown, port A1 of each of the two-way proportional multi-valve 3 is connected to port A2 of the rodless chamber 114 of the piston cylinder 11, and port B1 of each of the two-way proportional multi-valve 3 is connected to port B2 of the rod chamber 113 of the piston cylinder 11. When oil is input through A1A2 and output through B1B2, the resonant crushing device 14 rises; when oil is output through A1A2 and input through B1B2, the resonant crushing device 14 descends.

[0050] In the hydraulic pressing system of the present application, the controller changes the infusion direction and infusion opening of the two cavities of the piston cylinder 11 through the A port and B port of each link of the two-link proportional multi-way valve 3, thereby controlling the extension or retraction of the cylinder 111 relative to the cylinder rod 112, and the corresponding extension and retraction speed, so that the downward pressure speed of the resonant crushing device 14 can be controlled by adjusting the input electrical signal size of the two-link proportional multi-way valve 3, thereby achieving precise control and laying the foundation for improving the crushing quality and crushing efficiency.

[0051] Furthermore, in one embodiment, the hydraulic pressing system further includes a slide rail 13 , and the resonance crushing device 14 moves up and down along the slide rail 13 under the action of the two piston cylinders 11 to impact the object 15 to be struck.

[0052] Specifically, the resonance crushing device 14 is disposed between the two slide rails 13 , and the movement gap between the resonance crushing device 14 and the slide rails 13 is very small.

[0053] Furthermore, in one embodiment, a displacement sensor 12 is provided on each of the two piston cylinders 11 , and both displacement sensors 12 are connected to the controller for signal transmission. The displacement sensor 12 is used to monitor the relative displacement between the cylinder barrel 111 and the cylinder rod.

[0054] The controller acquires data from the two displacement sensors 12 in real time and performs a displacement comparison. If the difference in displacement between the two displacement sensors 12 exceeds a set threshold, indicating that the displacements of the two piston cylinders 11 are out of sync, the controller adjusts the input electrical signal to the corresponding link in the two-link proportional multi-way valve 3, thereby regulating the relative speed of the two cylinders to ensure synchronous movement and displacement.

[0055] Specifically, the movement displacement of the two piston cylinders 11 must be kept synchronized, otherwise the resonance crushing device 14 will be stuck in the slide rail 13. To this end, the displacement sensors 12 on the two piston cylinders 11 are used to compare the displacement in real time. If the displacement difference exceeds the set threshold, the input electrical signal size of the corresponding link in the two-link proportional multi-way valve 3 is adjusted, and then the relative movement speed of the two piston cylinders 11 is adjusted to ensure the synchronization of movement displacement.

[0056] The hydraulic clamping system of the present application sets two displacement sensors 12 on the two piston cylinders 11 respectively. The controller obtains the data of the two displacement sensors 12 in real time and performs displacement comparison in real time. When the displacement difference exceeds the set threshold, it means that the displacement of the two piston cylinders 11 is not synchronized. The input electrical signal size of the corresponding link in the two-link proportional multi-way valve 3 is adjusted, and then the relative movement speed of the two cylinders is adjusted to ensure that the movement displacement of the two piston cylinders 11 is synchronized, and prevent the resonant crushing device 14 from sliding along the slide rail 13 and getting stuck.

[0057] Furthermore, in one embodiment, the hydraulic pressing system further includes two double balancing valves 7 , and the two parts of each double balancing valve 7 are respectively arranged to be connected to the two chambers of the piston cylinder 11 .

[0058] Each piston cylinder 11 has two chambers provided with a dual balancing valve 7. Specifically, the two parts of the dual balancing valve 7 are respectively provided and connected to the two chambers of the piston cylinder 11. The dual balancing valve 7 is used to control the extension and contraction of the oil cylinder more smoothly and to hydraulically lock the resonant crushing device 14 when it is not in operation.

[0059] Furthermore, in one embodiment, a pressure sensor 5 or a pressure measuring joint 10 is provided in each cavity of each piston cylinder 11, and the signal of the pressure sensor 5 or the pressure measuring joint 10 is connected to the controller, and the controller obtains the oil pressure of the two cavities in real time.

[0060] The controller adjusts the oil pressure in the rod chamber 113 through the proportional relief valve 6, obtains the oil pressure in the two chambers of the cylinder through the pressure sensor 5 or the pressure measuring joint 10, and adjusts the actual pressing force based on the known effective area of ​​the two chambers.

[0061] Specifically, if the oil pressure of the rod chamber 113 is P1 and the effective area is S1, and the oil pressure of the rodless chamber 114 is P2 and the effective area is S2, the actual pressing force is equal to P1×S1−P2×S2.

[0062] In the hydraulic clamping system of the present application, the controller adjusts the oil pressure in the rod chamber 113 through the proportional relief valve 6, obtains the oil pressure in the two chambers of the cylinder through the pressure sensor 5 or the pressure measuring joint 10, and adjusts the actual clamping force in combination with the known effective area of ​​the two chambers, thereby realizing precise control and adjustment of the actual clamping force.

[0063] Furthermore, in one embodiment, the hydraulic pressing system further includes a high-pressure accumulator 8 and a low-pressure accumulator 9. The high-pressure accumulator 8 is connected to the rod chambers 113 of the two piston cylinders 11 through a pipe, and the low-pressure accumulator 9 is connected to the rodless chambers 114 of the two piston cylinders 11 through a pipe.

[0064] The hydraulic clamping system of the present application is based on the process in which the cylinder drives the resonance crushing device 14 to press down and crush the object 15 to be hit, which often produces a huge pressure shock in the two chambers of the cylinder. A high-pressure accumulator 8 and a low-pressure accumulator 9 are arranged in the two chambers of the cylinder. The high-pressure accumulator 8 and the low-pressure accumulator 9 can effectively absorb the pressure shock, so that the control of the clamping force is less affected by the load disturbance and the clamping force control is more precise.

[0065] Preferably, a pressure gauge 4 is provided on the two-way proportional multi-way valve 3 , and the pressure gauge 4 is used to monitor the working pressure, and the working pressure can partially and intuitively reflect the characteristics of the struck object 15 .

[0066] The hydraulic clamping system of the present application adopts a two-way proportional multi-way valve 3 to control the clamping cylinder and sets a proportional overflow valve 6 in the rod chamber 113 of the cylinder to control the size of the cylinder retraction force. At the same time, accumulators are set in the two chambers of the cylinder to absorb the pressure shock during the movement of the cylinder, and finally realizes effective control of the cylinder clamping force and downward pressing speed, thereby improving the crushing quality and crushing efficiency of the struck object.

[0067] In a second aspect, the present application discloses a crushing method based on the above-mentioned hydraulic compaction system, comprising the following steps:

[0068] The controller divides the input electrical signal of the proportional relief valve 6 into multiple levels, corresponding to the multiple levels of pressing force of the resonance crushing device 14. When there are two variables, one variable is divided as a constant.

[0069] Under each level of compaction force, the controller gradually changes the input electrical signal of the two-way proportional multi-way valve to adjust the downward pressure speed of the resonance crushing device.

[0070] Repeated tests were conducted on the experimental sample object 15 to determine the optimal combination of compression force and downward pressure speed for the object 15. This optimal combination of compression force and downward pressure speed ensures that the object 15 is crushed in the shortest possible time and that the particle size distribution after crushing meets the specified requirements. This optimal combination of compression force and downward pressure speed is the optimal solution for crushing the object 15 with these characteristics.

[0071] When other objects 15 to be crushed with the same characteristics are crushed by applying the optimal combination of compaction force and downward pressure speed, the optimal crushing quality (particle size distribution meets the requirements) and crushing efficiency (fastest crushing) can be obtained.

[0072] The crushing method of the hydraulic pressing system of the present application is divided into several levels of pressing force. Under each level of pressing force, the controller gradually changes the input electrical signal size of the two-way proportional multi-way valve to adjust the downward pressure speed of the resonant crushing device, and repeats multiple groups of tests to find the optimal combination of pressing force and downward pressure speed for the object 15 being struck. The optimal combination of pressing force and downward pressure speed satisfies the requirements that the object 15 being struck is crushed in the shortest time and the particle size distribution after crushing meets the set requirements. The optimal combination of pressing force and downward pressure speed is found for the object 15 being struck (small area or small volume) of the experimental sample, and the optimal combination of pressing force and downward pressure speed is applied to the remaining objects 15 to be crushed (large area or large volume) to obtain the optimal resonant crushing quality and crushing efficiency. Compared with the prior art, in which objects with different characteristics are all struck blindly, the present application greatly improves the crushing quality and crushing efficiency.

[0073] Furthermore, in one embodiment, the hydraulic pressing system further includes a slide rail 13 , and the resonance crushing device 14 moves up and down along the slide rail 13 under the action of the two piston cylinders 11 to impact the object 15 to be struck.

[0074] Specifically, the resonance crushing device 14 is disposed between the two slide rails 13 , and the movement gap between the resonance crushing device 14 and the slide rails 13 is very small.

[0075] Displacement sensors 12 are provided on both piston cylinders 11 . Signals of the two displacement sensors 12 are connected to the controller. The displacement sensors 12 are used to monitor the relative displacement between the cylinder barrel 111 and the cylinder rod.

[0076] During the crushing test, the controller acquires data from the two displacement sensors 12 in real time and performs a displacement comparison. If the difference in displacement between the two displacement sensors 12 exceeds a set threshold, indicating that the displacements of the two piston cylinders 11 are out of sync, the controller adjusts the input electrical signal to the corresponding link in the two-link proportional multi-way valve 3, thereby regulating the relative movement speed of the two cylinders to ensure synchronous movement.

[0077] Specifically, the movement displacement of the two piston cylinders 11 must be kept synchronized, otherwise the resonance crushing device 14 will be stuck in the slide rail 13. To this end, the displacement sensors 12 on the two piston cylinders 11 are used to compare the displacement in real time. If the displacement difference exceeds the set threshold, the input electrical signal size of the corresponding link in the two-link proportional multi-way valve 3 is adjusted, and then the relative movement speed of the two piston cylinders 11 is adjusted to ensure the synchronization of movement displacement.

[0078] Furthermore, in one embodiment, a pressure sensor 5 or a pressure measuring joint 10 is provided in each cavity of each piston cylinder 11, and the signal of the pressure sensor 5 or the pressure measuring joint 10 is connected to the controller, and the controller obtains the oil pressure of the two cavities in real time.

[0079] The controller adjusts the oil pressure in the rod chamber 113 through the proportional relief valve 6, obtains the oil pressure in the two chambers of the cylinder through the pressure sensor 5 or the pressure measuring joint 10, and adjusts the actual pressing force based on the known effective area of ​​the two chambers.

[0080] The crushing method of the present application divides the compacting force into several levels, which are achieved by adjusting the oil pressure in the rod chamber 113 through the proportional relief valve 6, thereby achieving precise control and adjustment of the actual compacting force.

[0081] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0082] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0083] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A hydraulic pressing system for a resonance crushing device, characterized in that: Include: Two piston cylinders (11), the cylinder barrels (111) of the two piston cylinders (11) are fixedly connected to the resonance crushing device (14) through a mechanical structure, and the cylinder rods (112) of the piston cylinders (11) are fixed; A two-way proportional multi-way valve (3) obtains oil from a metering pump (2), supplies oil to two piston cylinders (11), and controls the telescopic movement of the two piston cylinders (11); Two proportional relief valves (6) are respectively provided in the rod chambers (113) of the two piston cylinders (11); A controller, whose signal is connected to and controls the two-way proportional multi-way valve (3) and the two proportional relief valves (6); the controller is used to adjust the input electrical signal size of the two-way proportional multi-way valve (3) to control the downward pressure speed of the resonance crushing device (14), and is also used to adjust the input electrical signal size of the proportional relief valve (6) to adjust the pressing force of the resonance crushing device (14).

2. The hydraulic pressing system of a resonance crushing device according to claim 1, characterized in that: The two links of the two-link proportional multi-way valve (3) are respectively connected to the two piston cylinders (11), and each link comprises an A port and a B port, wherein the A port is connected to the rodless cavity (114) of the piston cylinder (11), and the B port is connected to the rod cavity (114) of the piston cylinder (11); The controller adjusts the infusion direction and infusion opening of the two cavities of the piston cylinder (11) through the A port and the B port of each link of the two-link proportional multi-way valve (3).

3. The hydraulic pressing system of a resonance crushing device according to claim 1, characterized in that: The hydraulic pressing system further comprises a slide rail (13), and the resonance crushing device (14) moves up and down along the slide rail (13) under the action of the two piston cylinders (11), impacting the object to be struck (15).

4. The hydraulic pressing system of a resonance crushing device according to claim 1, characterized in that: The two piston cylinders (11) are both provided with displacement sensors (12), and the signals of the two displacement sensors (12) are both connected to the controller; when the displacement difference of the monitoring data obtained by the controller from the two displacement sensors (12) exceeds a set threshold value, the input electrical signal size of the corresponding link in the two-link proportional multi-way valve (3) is adjusted, thereby maintaining displacement synchronization.

5. The hydraulic pressing system of a resonance crushing device according to claim 1, characterized in that: The hydraulic pressing system further comprises two double balancing valves (7), wherein the two parts of each double balancing valve (7) are respectively arranged to be connected to the two chambers of the piston cylinder (11).

6. The hydraulic pressing system of a resonance crushing device according to claim 1, characterized in that: Each cavity of each piston cylinder (11) is provided with a pressure sensor (5) or a pressure measuring joint (10), and the pressure sensor (5) or the pressure measuring joint (10) is connected to the controller in terms of signal; The controller adjusts the oil pressure of the rod chamber (113) through a proportional relief valve (6), obtains the oil pressure of the two chambers of the oil cylinder through a pressure sensor (5) or a pressure measuring joint (10), and adjusts the actual pressing force in combination with the known effective areas of the two chambers.

7. The hydraulic pressing system of a resonance crushing device according to claim 1, characterized in that: The hydraulic pressing system further comprises a high-pressure accumulator (8) and a low-pressure accumulator (9); the high-pressure accumulator (8) is connected to the rod chambers (113) of the two piston cylinders (11) through a pipeline, and the low-pressure accumulator (9) is connected to the rodless chambers (114) of the two piston cylinders (11) through a pipeline.

8. A crushing method based on the hydraulic compaction system according to claim 1, characterized in that: Contains steps: The controller divides the input electrical signal of the proportional relief valve (6) into multiple levels, corresponding to several levels of pressing force of the resonance crushing device (14); Under each level of pressing force, the controller gradually changes the input electrical signal of the two-way proportional multi-way valve (3) to adjust the downward pressing speed of the resonance crushing device (14); Conducting multiple groups of crushing tests on the struck object (15) of the experimental sample to find the optimal combination of compaction force and downward pressing speed, wherein the optimal combination of compaction force and downward pressing speed satisfies the requirement that the struck object 15 is crushed in the shortest time and the particle size distribution after crushing satisfies the set requirements; The remaining objects to be crushed (15) are crushed by applying an optimal combination of compaction force and downward pressing speed.

9. The crushing method according to claim 8, characterized in that: The hydraulic pressing system further comprises a slide rail (13), and the resonance crushing device (14) moves up and down along the slide rail (13) under the action of two piston cylinders (11); the two piston cylinders (11) are both provided with displacement sensors (12), and the signals of the two displacement sensors (12) are both connected to the controller; During the crushing test, when the displacement difference of the monitoring data obtained by the controller from the two displacement sensors (12) exceeds a set threshold, the magnitude of the input electrical signal of the corresponding link in the two-link proportional multi-way valve (3) is adjusted to maintain the displacement synchronization of the two piston cylinders (11).

10. The crushing method according to claim 8, wherein: Each cavity of each piston cylinder (11) is provided with a pressure sensor (5) or a pressure measuring joint (10), and the pressure sensor (5) or the pressure measuring joint (10) is connected to the controller in terms of signal; The controller adjusts the oil pressure of the rod chamber (113) through a proportional relief valve (6), obtains the oil pressure of the two chambers of the oil cylinder through a pressure sensor (5) or a pressure measuring joint (10), and adjusts the actual pressing force in combination with the known effective areas of the two chambers.

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