Hydraulic protection and automatic reset system of double-roller sand making machine

Abstract

The hydraulic protection and automatic reset system comprises a hydraulic station and a high-pressure oil pipe, the high-pressure oil pipe is connected between the hydraulic station and an oil cylinder spring assembly, the hydraulic station comprises an oil tank and a hydraulic main loop, and an oil filter, a hydraulic pump, a one-way valve and a sensing element are arranged on the hydraulic main loop. A bypass and an unloading loop are arranged between the hydraulic main loop and the oil tank in parallel, an overflow valve is arranged on the bypass, and a hydraulic control one-way valve and a two-position four-way electromagnetic valve are arranged on the unloading loop. The sensing element is arranged on the hydraulic main loop and matched with the bypass and the unloading loop, so that the movable double-roller assembly of the double-roller sand making machine can have large-range yielding amount, the yield of the movable double-roller assembly is increased, and the yield of the movable double-roller assembly is increased. And after discharging is finished, the movable double-roller assembly can automatically reset to the initial position, and equipment damage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a broken machine equipment technical field especially is related to a hydraulic protection and automatic reset system of pair roller sand making machine. BACKGROUND

[0002] Pair roller sand making machine is a kind of simple structure, energy-efficient sand making machine, is widely used in mining, building materials etc., and its working principle core part is that two rollers are driven by motor and reducer and rotate oppositely at certain speed, and the sandstone material entering the broken cavity between two rollers is broken into smaller particles.

[0003] To buffer and adjust the impact load of pair roller sand making machine in working, in the prior art, spring system is installed on the bearing seat of the two ends of movable roller, or spring reset device is arranged on the side of movable frame for installing movable roller.In the working process of pair roller sand making machine, when small hard rock or difficult-to-crush foreign matter enters the broken cavity, the pressure between two rollers will increase, and then the spring in spring reset device is forced to compress, and the distance between two rollers becomes larger, if the volume of hard rock or foreign matter is not large, it will be successfully discharged from the equipment, and then the pressure between rollers is reduced, and spring reset device pushes movable roller to reset and continues to work.But when encountering large hard rock or difficult-to-crush foreign matter, the pressure between rollers will suddenly increase, which will cause the distance between two rollers to exceed the maximum value and exceed the maximum compression amount of spring, and then forced roller pressing will damage the equipment, which needs to be improved. UTILITY MODEL CONTENTS

[0004] To solve the above problems, the utility model provides a kind of hydraulic protection and automatic reset system of pair roller sand making machine.

[0005] The technical scheme adopted by the utility model is: a kind of hydraulic protection and automatic reset system of pair roller sand making machine, the pair roller sand making machine includes rack, movable frame is slidably installed on the rack along left and right directions, movable pair roller assembly is fixed on the movable frame, fixed pair roller assembly and a plurality of oil cylinder spring assemblies are fixed on the rack, one end of the oil cylinder spring assembly is abutted on one side of the movable pair roller assembly, the hydraulic protection and automatic reset system is used to control the work of the oil cylinder spring assembly, and it includes hydraulic station and high-pressure oil pipe, the high-pressure oil pipe is connected between the hydraulic station and the oil cylinder spring assembly, and the hydraulic station includes:

[0006] Oil tank;

[0007] A hydraulic main circuit is installed between the oil tank and the high-pressure oil pipe and comprises a front section and a rear section. The front section is provided with an oil filter, a hydraulic pump and a check valve in series from front to rear. The hydraulic pump is provided with a drive motor on one side. The rear section is provided with a bypass and an unloading circuit in parallel with the oil tank. An overflow valve is installed on the bypass. A hydraulic control check valve and a two-position four-way electromagnetic valve are installed on the unloading circuit. An inductive element is installed on the hydraulic main circuit to sense the change in oil pressure in the hydraulic main circuit and transmit an inductive signal to a control system. The control system controls the drive motor and the two-position four-way electromagnetic valve based on the inductive signal.

[0008] The following also provides several optional modes, but not as an additional limitation of the above general scheme, just a further supplement or preferred, without technical or logical contradiction, each optional mode can be combined with the above general scheme alone, but also can be combined between multiple optional modes.

[0009] The inductive element comprises:

[0010] A first electrical contact pressure gauge is provided in parallel on the front section to sense the hydraulic main circuit oil pressure and control the drive motor in cooperation with the control system.

[0011] A second electrical contact pressure gauge is provided in parallel on the rear section to sense the hydraulic main circuit oil pressure and control the two-position four-way electromagnetic valve in cooperation with the control system.

[0012] Preferably, the first electrical contact pressure gauge is provided with two pressure point set values P1 and P2, and P1>P2; the second electrical contact pressure gauge is provided with two pressure point set values P3 and P4, and P3>P4.

[0013] Preferably, the overflow valve is provided with a pressure point set value P, and P>P3>P1>P2>P4≥0.

[0014] Preferably, the inductive element is a pressure sensor provided with at least one analog signal AI.

[0015] Preferably, the inductive element is provided on the rear side oil circuit of the check valve.

[0016] Preferably, the oil outlet port of the two-position four-way electromagnetic valve and the hydraulic control port of the hydraulic control check valve are connected to each other, and the hydraulic control check valve and the two-position four-way electromagnetic valve both return oil to the oil tank.

[0017] Preferably, the rear cavities of all the oil cylinder spring assemblies are communicated to the high-pressure oil pipe, and one end of the high-pressure oil pipe is installed at the outlet of the hydraulic main circuit through a joint body.

[0018] More preferably, a plurality of accumulators are connected in parallel on the high-pressure oil pipe.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] By arranging bypass and unloading circuit between the hydraulic main circuit and the oil tank of the hydraulic station, arranging overflow valve on the bypass, arranging hydraulic control check valve and two-position four-way electromagnetic valve on the unloading circuit, and arranging sensing element on the hydraulic main circuit, when the volume of hard rock or hard-to-crush foreign matter between the movable roller and the fixed roller is too large, the pressure in the oil cylinder rear cavity, the high-pressure oil pipe and the hydraulic main circuit will sharply rise, once the value exceeds the setting value of the sensing element, the sensing element will transmit the electric signal to the control system, the control system controls the coil CT of the two-position four-way electromagnetic valve to be electrified, the high-pressure oil enters the hydraulic control port of the hydraulic control check valve through the two-position four-way electromagnetic valve, and the hydraulic control port is opened, the high-pressure oil of the hydraulic main circuit quickly returns to the oil tank through the hydraulic control check valve to release pressure, at this time, the oil cylinder and the spring in the oil cylinder spring assembly quickly return to the last state, the distance between the two rollers returns to the maximum, and the large material and hard-to-crush foreign matter is discharged. After the discharging is completed, the sensing element senses that the oil pressure in the main circuit is low, controls the hydraulic pump to work to make the oil pressure in the circuit rise, and drives the oil cylinder and the spring to automatically restore the movable roller to the original position, thereby ensuring that the equipment is not damaged when encountering large hard rock or hard-to-crush foreign matter. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in the drawings without creative labor.

[0022] Figure 1 It is a plane assembly schematic view of the roller sand making machine and the hydraulic station involved in an embodiment of the application.

[0023] Figure 2 It is a front side view structural schematic view of the roller sand making machine involved in an embodiment of the application.

[0024] The labels in the drawings are: 1-frame, 102-feed inlet, 103-discharge outlet, 2-moving frame, 3-fixed pair roller assembly, 301-first motor, 302-first coupling, 303-first speed reducer, 304-second coupling, 305-fixed roller, 4-moving pair roller assembly, 401-second motor, 402-third coupling, 403-second speed reducer, 404-fourth coupling, 405-moving roller, 5-oil cylinder spring assembly, 501-oil cylinder, 502-spring seat plate, 503-spring, 6-accumulator, 7-hydraulic station, 701-oil tank, 702-oil filter, 703-hydraulic pump, 704-driving motor, 705-check valve, 706-excess valve, 707-hydraulic control check valve, 708-two-position four-way electromagnetic valve, 709-first electric contact pressure gauge, 710-second electric contact pressure gauge, 8-joint body, 9-high pressure pipeline.

[0025] The realization, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0027] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0028] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0029] Specific implementation scheme: refer to Figures 1-2The utility model relates to a kind of hydraulic protection and automatic reset system of roll sand making machine, roll sand making machine includes rack 1, movable frame 2 is slidably installed on rack 1 along left-right direction, movable frame 2 is fixed with movable roll assembly 4, fixed roll assembly 3 and several oil cylinder spring assemblies 5 are fixed on rack 1, one end of oil cylinder spring assembly 5 is abutted on one side of movable roll assembly 4, and hydraulic protection and automatic reset system are used to control the work of oil cylinder spring assembly 5, and including hydraulic station 7 and high-pressure oil pipe, high-pressure oil pipe is connected between hydraulic station 7 and oil cylinder spring assembly 5, and hydraulic station 7 includes:

[0030] Oil tank 701;

[0031] Hydraulic main circuit is installed between oil tank 701 and high-pressure oil pipe, and includes front section and rear section, filter, hydraulic pump 703 and check valve 705 are sequentially connected in series from front to back in front section, drive motor 704 is arranged on one side of hydraulic pump 703, bypass and unloading circuit are arranged in parallel between rear section and oil tank 701, wherein overflow valve 706 is installed on bypass, and hydraulic control check valve 707 and two-position four-way electromagnetic valve 708 are installed on unloading circuit;Induction element is installed on hydraulic main circuit, for sensing the oil pressure change in hydraulic main circuit, and induction signal is transmitted to control system, and control system controls drive motor 704 and two-position four-way electromagnetic valve 708 based on induction signal.

[0032] For the convenience of understanding, please refer to Figure 1 And Figure 2 , the structure and working principle of roll sand making machine involved in the embodiment are described as follows:

[0033] Fixed roll assembly 3 includes first motor 301, first speed reducer 303 and fixed roll 305, and first coupling 302 is arranged between first motor 301 and first speed reducer 303, and second coupling 304 is arranged between first speed reducer 303 and fixed roll 305.

[0034] Movable roll assembly 4 includes second motor 401, second speed reducer 403 and movable roll 405, third coupling 402 is arranged between second motor 401 and second speed reducer 403, and fourth coupling 404 is arranged between second speed reducer 403 and movable roll 405.

[0035] First motor drives first speed reducer 303 to work through first coupling 302, and first speed reducer 303 adjusts rotating speed and torque of output shaft, and then drives fixed roll 305 to rotate through second coupling 304. Second motor drives second speed reducer 403 to work through third coupling 402, and second speed reducer 403 adjusts rotating speed and torque of output shaft, and then drives movable roll 405 to rotate through fourth coupling 404.

[0036] The fixed roller 305 and the movable roller 405 form a crushing cavity, and the machine frame 1 is provided with an inlet 102 and an outlet 103 corresponding to the upper and lower sides of the crushing cavity. During the relative rotation of the fixed roller 305 and the movable roller 405, the material enters the crushing cavity through the inlet 102 and is crushed, and then flows out through the outlet 103.

[0037] In the embodiment, the movable frame 2 is slidably installed on the machine frame 1 along the left-right direction, and the movable roller assembly 4 is fixed on the movable frame 2. Therefore, the hydraulic protection and automatic reset system can be used to control the operation of the oil cylinder spring assembly 5 to drive the translation and reset of the movable roller assembly 4.

[0038] Then, referring to Figure 1 It can be seen that, in the embodiment, the sensing element includes:

[0039] The first electric contact pressure gauge 709 is connected in parallel on the front section and is used to sense the oil pressure of the hydraulic main circuit and control the operation of the driving motor 704 in cooperation with the control system;

[0040] The second electric contact pressure gauge 710 is connected in parallel on the rear section and is used to sense the oil pressure of the hydraulic main circuit and control the operation of the two-position four-way electromagnetic valve 708 in cooperation with the control system.

[0041] In addition, in the embodiment, the first electric contact pressure gauge 709 is provided with two pressure point set values P1 and P2, the second electric contact pressure gauge 710 is provided with two pressure point set values P3 and P4, and the overflow valve 706 is provided with a pressure point set value P.

[0042] It should be noted that, in order to ensure the normal operation of the roller sand making machine, the above-mentioned pressure point set values have a logical relationship, that is, P>P3>P1>P2>P4≥0.

[0043] Referring to Figure 1 It can be seen that, in the embodiment, the sensing element is arranged on the rear side oil circuit of the one-way valve 705.

[0044] Next, in the embodiment, the oil outlet port of the two-position four-way electromagnetic valve 708 and the hydraulic control port of the hydraulic control one-way valve 707 are connected to each other, and the hydraulic control one-way valve 707 and the two-position four-way electromagnetic valve 708 both return oil to the oil tank 701.

[0045] Then, referring to Figure 1As can be seen, in the present embodiment, the oil cylinder spring assembly 5 comprises an oil cylinder 501, a spring seat plate 502 and a spring 503. Since the oil cylinder spring assembly 5 is prior art, only a brief description is given here. When an external force generated by the extrusion between the rollers acts on the spring 503 and the oil cylinder 501, the spring 503 is elastically deformed, absorbs part of the external force and stores energy. At the same time, hydraulic oil enters the oil cylinder 501 through the high-pressure pipeline 9, so that the piston rod is subjected to the action of hydraulic pressure and moves, and by pushing the spring seat plate 502, the spring 503 is compressed. When the external force decreases or disappears, the spring 503 releases the stored energy and pushes the piston to move in the opposite direction, thereby discharging the hydraulic oil from the oil cylinder 501.

[0046] In the present embodiment, the rear cavity of the oil cylinder 501 of all the oil cylinder spring assemblies 5 is communicated to the high-pressure oil pipe, and one end of the high-pressure oil pipe is installed at the outlet of the hydraulic main circuit through the joint body 8.

[0047] More specifically, a plurality of accumulators 6 are installed in parallel on the high-pressure oil pipe.

[0048] Specific working principle of the hydraulic protection and automatic reset system:

[0049] Please refer to Figure 1, drive motor 704 drives hydraulic pump 703 work, hydraulic pump 703 will hydraulic oil tank 701 pump out, and in turn through the oil filter 702, hydraulic pump 703 and check valve 705 located in the hydraulic main circuit front section, then enter the hydraulic main circuit rear section, then through the joint body 8 and high pressure pipeline 9 into the cylinder spring assembly 5 cylinder 501 back cavity, the hydraulic oil will drive the piston rod of the cylinder 501 push spring seat plate 502 compression spring 503, several cylinder spring assembly 5 together push the movable roller 405 to reach the predetermined position; at the same time, the high pressure hydraulic oil enters the several accumulators 6 in parallel on the hydraulic main circuit, accumulates potential energy. Relief valve 706 sets the maximum pressure value P of the hydraulic system, when the system oil pressure exceeds the set P value, the hydraulic oil in the hydraulic main circuit through the overflow valve 706 overflow pressure relief, prevent the system pressure is too high, the overflow hydraulic oil directly back to the tank 701. On the hydraulic main circuit is provided with a first electric contact pressure gauge 709 and a second electric contact pressure gauge 710, wherein, the first electric contact pressure gauge 709 sets high and low two pressure set value P1 and P2, and P1>P2; similarly, the second electric contact pressure gauge 710 also sets high and low two pressure set value P3 and P4, and P3>P4. When the first electric contact pressure gauge 709 senses the main system circuit oil pressure rises to P1 point, sends an electric signal to the control system, and controls the drive motor 704 to stop working, the hydraulic pump 703 stops working, the system enters the pressure maintaining state. This P1 point is the normal working oil pressure value of the system, indicating that the movable roller 405 has reached the predetermined roller distance, the spring 503 in the cylinder spring assembly 5 is also pre compressed to the predetermined degree, satisfying the working state of the roller mill, at this time the first motor 301 and the second motor 401 of the roller mill can start working. During the working of the roller mill, due to the different particle size and hardness of the material, the roller pressure will change, which will cause the oil cylinder 501 back cavity and the system oil pressure to fluctuate within a certain range. The fluctuation of the oil pressure will change within a small range due to the setting of the accumulator 6, so as to maintain the smooth working of the roller mill. When large hard rock or difficult to break foreign matter enters the crushing cavity of the roller mill, the roller pressure increases sharply, causing the oil cylinder 501 back cavity and the system pressure to rise sharply. Once the P3 value set by the second electric contact pressure gauge 710 is exceeded, the second electric contact pressure gauge 710 will send an electric signal, which will make the coil CT of the two position four way electromagnetic valve 708 electrified through the control system, and the pressure oil will enter the hydraulic control port of the hydraulic control check valve 707 and open it. The high pressure oil of the hydraulic main circuit will quickly return to the tank 701 through the hydraulic control check valve 707 to relieve pressure. At this time, the oil cylinder 501 and the spring 503 in the cylinder spring assembly 5 will quickly return to the last state, and the roller distance will return to the maximum, so as to discharge the large material and difficult to break foreign matter.When the pressure value of the hydraulic main circuit is lower than the P2 point of the first electric contact pressure gauge 709, the first electric contact pressure gauge 709 sends an electric signal to the control system to control the starting of the driving motor 704 to drive the hydraulic pump 703 to work, the system pressure rebounds and quickly rises, and the piston rod of the oil cylinder 501 is driven to move and compress the spring 503, so that the movable roller 405 is quickly reset, and the accumulator 6 starts to store energy. When the pressure in the hydraulic main circuit reaches the P1 point, the first electric contact pressure gauge 709 sends an electric signal to the control system, and the control system controls the driving motor 704 to stop the hydraulic pump 703 from working, and the system automatically enters the normal working state. It should be noted that the P4 value of the second electric contact pressure gauge sets the minimum oil pressure of the system, that is, the maximum distance that the movable roller 405 can retreat. The lower the P4 value, the greater the distance that the movable roller 405 can retreat. When P4=0, the maximum retreat distance of the movable roller 405 is reached. Therefore, the P4 value can be selected within a certain range according to the actual use state of the roller sand making machine.

[0050] From the above process, in order to ensure the normal work of the roller sand making machine, the following logical relationship exists between the above-mentioned oil pressure working points: P>P3>P1>P2>P4≥0. In actual use, the above relationship can be changed within a certain range according to the equipment condition, the hardness and particle size of the material, and the configuration of the system, but it will not exceed the above relationship in principle.

[0051] In addition, in other embodiments, the sensing element can also use a pressure sensor, and the pressure sensor is provided with at least one analog signal AI, that is, one analog signal AI (4-20mA or 0-10V) is used to replace the four switch signals DI to transmit signals to the control system, and the above functions can also be realized.

[0052] The hydraulic protection and automatic reset system of the roller sand making machine of the utility model is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the attached drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A hydraulic protection and automatic reset system for a double-roll crusher, the double-roll crusher comprising a frame, a movable frame slidably mounted on the frame in a left-right direction, a movable double-roll assembly fixed on the movable frame, a fixed double-roll assembly and a plurality of hydraulic cylinder spring assemblies fixed on the frame, one end of each hydraulic cylinder spring assembly abutting against one side of the movable double-roll assembly, characterized in that, The hydraulic protection and automatic reset system is used to control the operation of the cylinder spring assembly, and includes a hydraulic station and a high-pressure oil pipe. The high-pressure oil pipe is connected between the hydraulic station and the cylinder spring assembly. The hydraulic station includes: tank; The hydraulic main circuit is installed between the oil tank and the high-pressure oil pipe, and includes a front section and a rear section. The front section is equipped with an oil filter, a hydraulic pump and a check valve connected in series from front to back. A drive motor is installed on one side of the hydraulic pump. A bypass and an unloading circuit are connected in parallel between the rear section and the oil tank. An overflow valve is installed on the bypass, and a hydraulically controlled check valve and a two-position four-way solenoid valve sensing element are installed on the unloading circuit. These sensing elements are installed on the hydraulic main circuit to sense changes in oil pressure in the hydraulic main circuit and transmit the sensing signal to the control system. The control system controls the drive motor and the two-position four-way solenoid valve to work based on the sensing signal.

2. The hydraulic protection and automatic reset system for a double-roll crusher according to claim 1, characterized in that, The sensing element includes a first electrical contact pressure gauge, which is connected in parallel on the front section to sense the hydraulic main circuit oil pressure and cooperate with the control system to control the operation of the drive motor. The second electrical contact pressure gauge is connected in parallel on the downstream section to sense the hydraulic main circuit oil pressure and to cooperate with the control system to control the operation of the two-position four-way solenoid valve.

3. The hydraulic protection and automatic reset system for a double-roll crusher according to claim 2, characterized in that, The first electric contact pressure gauge has two pressure point settings, P1 and P2, where P1 > P2; the second electric contact pressure gauge has two pressure point settings, P3 and P4, where P3 > P4.

4. The hydraulic protection and automatic reset system for a double-roll crusher according to claim 3, characterized in that, The overflow valve has a pressure point setpoint P, and P>P3>P1>P2>P4≥0.

5. The hydraulic protection and automatic reset system for a double-roll crusher according to claim 1, characterized in that, The sensing element is a pressure sensor, and the pressure sensor is equipped with at least one analog signal AI.

6. A hydraulic protection and automatic reset system for a double-roll crusher according to any one of claims 1-5, characterized in that, The sensing element is located on the oil line behind the one-way valve.

7. The hydraulic protection and automatic reset system for a double-roll crusher according to claim 6, characterized in that, The oil outlet port of the two-position four-way solenoid valve and the hydraulic control port of the hydraulic control check valve are connected to each other, and both the hydraulic control check valve and the two-position four-way solenoid valve return oil to the oil tank.

8. A hydraulic protection and automatic reset system for a double-roll crusher according to any one of claims 1 or 7, characterized in that, The rear chamber of all the cylinder spring assemblies is connected to the high-pressure oil pipe, one end of which is installed at the outlet of the hydraulic main circuit via a connector.

9. The hydraulic protection and automatic reset system for a double-roll crusher according to claim 8, characterized in that, Multiple accumulators are installed in parallel on the high-pressure oil pipe.

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