Constant-flow lift valve pump and logic control method thereof

Abstract

The invention provides a constant-current lift valve pump and a logic control method thereof, and belongs to the technical field of valve pumps, the constant-current lift valve pump comprises a base, and a left valve pump assembly, a right valve pump assembly and a water tank are fixed to the upper end of the base; the left valve pump assembly and the right valve pump assembly are embedded in and penetrate through the middle of the water tank. The left hydraulic cylinder and the right hydraulic cylinder operate alternately, pistons controlled by the two hydraulic cylinders act in the same direction for a certain time in the extending stage, and materials are always in a knockout state, so that the materials are always conveyed forwards in a pipeline, and constant-flow conveying is achieved. Therefore, the conveying pressure cannot be frequently converted, and the service life of hydraulic elements of the hydraulic station and the service life of the whole equipment can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of valve pumps, and in particular to a constant current lifting valve pump and a logic control method thereof. Background Art

[0002] Commonly used conveying equipment on the market now, such as S-swing valve pumps, cone valve pumps, skirt valve pumps, etc., all feed intermittently. When the piston changes direction, the conveying volume drops to near zero instantly, which is not conducive to feeding at the end of the system and will cause adverse effects such as sintering and empty burning. In addition, the frequent and instantaneous drop of the conveying volume from a high position to zero will cause adverse effects such as pressure pulsation, pipeline vibration, and large amount of material reflux.

[0003] Therefore, the present invention provides a constant-current lift valve pump and a logic control method thereof. Summary of the invention

[0004] The present invention provides a constant-current lift valve pump and a logic control method thereof, which are used to solve the above-mentioned technical problems.

[0005] The present invention provides a constant flow lift valve pump, comprising: a base, the upper end of which is respectively fixed with a left valve pump assembly, a right valve pump assembly and a water tank; The left valve pump assembly and the right valve pump assembly are respectively embedded in and penetrate the middle part of the water tank.

[0006] Preferably, the left valve pump assembly comprises: a left hydraulic cylinder, a left material cylinder, a cone valve cylinder 1, a cone valve cylinder 2, a material suction chamber 1, and a material pressing chamber 1; The left hydraulic cylinder is embedded and penetrates the middle of the water tank, and then a left material cylinder, a material suction chamber 1, a material pressing chamber 1, and a cone valve cylinder 2 are sequentially arranged from right to left; The cone valve cylinder 1 is located at the lower part of the suction chamber 1; The right valve pump assembly includes: a right hydraulic cylinder, a right material cylinder, a cone valve cylinder 3, a cone valve cylinder 4, a suction chamber 2, and a pressure chamber 2; The right hydraulic cylinder is embedded and penetrates the middle of the water tank, and then a right material cylinder, a material suction chamber 2, a material pressing chamber 2, and a cone valve cylinder 4 are sequentially arranged from right to left; The cone valve cylinder 3 is located at the lower part of the suction chamber 2; The tops of the suction chamber 1 and the suction chamber 2 are provided with feed inlets, and the bottoms of the pressing chamber 1 and the pressing chamber 2 are provided with discharge outlets.

[0007] The present invention provides a logic control method for a constant current lift valve pump, comprising: Step 1: Detect the positions of the corresponding pistons in the left hydraulic cylinder and the right hydraulic cylinder through the magnetic displacement sensor, and transmit the detection data of the magnetic displacement sensor to the PLC module to identify the specific positions of the first piston of the left hydraulic cylinder and the second piston of the right hydraulic cylinder. At this time, the control logic of the constant current lift valve pump starts to work; Step 2: The second piston controlled by the right hydraulic cylinder moves forward. At this time, the cone valve cylinder 3 is in a closed state and the cone valve cylinder 4 is in an open state. When the second piston reaches the preset position 1 from the end of the stroke, the first piston controlled by the left hydraulic cylinder moves forward from the zero position. At the same time, the three-position four-way solenoid valve controls the cone valve cylinder 1 to close and the cone valve cylinder 2 to close after being energized. The material moves forward in the left material cylinder. The piston corresponding to the left hydraulic cylinder pushes the material forward to squeeze the gap but does not punch the material. The piston corresponding to the right hydraulic cylinder punches the material. Step 3: The first piston of the left hydraulic cylinder continues to move forward, the cone valve cylinder 1 is in a closed state, the cone valve cylinder 2 is in a closed state, and the material moves forward in the left cylinder. Since the material is not filled, the material squeezes the gap in the left cylinder and builds up a certain pressure. The second piston of the right hydraulic cylinder continues to move toward the end of the stroke, the corresponding cone valve cylinder 3 is in a closed state, the cone valve cylinder 4 is in an open state, the piston corresponding to the left hydraulic cylinder is in a pressure-building state, and the piston corresponding to the right hydraulic cylinder continues to punch the material; Step 4: When the second piston of the right hydraulic cylinder moves to the preset position 2 away from the end of the working stroke, the magnetostrictive displacement sensor signal is triggered. After the electromagnetic proportional valve and the three-position four-way electromagnetic valve are energized, the cone valve cylinder 3 is opened and the cone valve cylinder 4 is closed. At the same time, the electromagnetic proportional valve and the three-position four-way electromagnetic valve are energized to control the cone valve cylinder 2 to open, and the cone valve cylinder 1 is still in a closed state. The first piston of the left hydraulic cylinder continues to move forward, and the piston corresponding to the left hydraulic cylinder starts to punch the material, while the piston corresponding to the right hydraulic cylinder quickly moves backward to start sucking the material; Step 5: The first piston of the left hydraulic cylinder continues to move forward, and the piston corresponding to the left hydraulic cylinder continues to punch materials. When the second piston of the right hydraulic cylinder quickly moves backward to the starting point of the stroke, the magnetostrictive displacement sensor signal is triggered. After the solenoid proportional valve and the three-position four-way solenoid valve are energized, the second piston of the right hydraulic cylinder moves forward, the cone valve cylinder 3 is closed, the cone valve cylinder 4 is closed, and the piston corresponding to the left hydraulic cylinder continues to punch materials; the piston corresponding to the right hydraulic cylinder begins to push the material forward in the right material cylinder, and the material is gradually compacted and pressure is built up.

[0008] Preferably, the left hydraulic cylinder and the right hydraulic cylinder are respectively provided with a magnetostrictive displacement sensor.

[0009] Preferably, the preset distance is 50-60 cm.

[0010] Preferably, it also includes: Based on a first pressure sensor of a first conveyor belt arranged at the feed inlet, a first pressure of conveying materials to the feed inlet is detected in real time; Based on a second pressure sensor of a second conveyor belt arranged at the discharge port, a second pressure of the material output from the discharge port is detected in real time; The processor arranged on the base is connected to the second pressure sensor and the second pressure sensor respectively, and the processor is also connected to the alarm and the display screen arranged on the base.

[0011] Preferably, it also includes: Based on the first pressure detected in real time and the second pressure detected in real time, a pressure matrix is ​​constructed. ,in, , A first vector constructed based on the first pressure and a second vector constructed based on the second pressure in a continuous time period before the current moment are constructed respectively; locking The first occurrence position of the element that is not 0 in the first occurrence position, and the initial non-appearance continuous duration Tc is counted based on the first occurrence position, and the first time deviation is obtained based on the processor ;

[0012] in, represents the predefined discharging time period based on the second pressure; t0 represents the continuous duration on both sides of the corresponding surrounding time point around T0 based on the predefined time; According to the first time deviation Tp, a first alarm instruction is issued to the alarm device; Based on the pressure matrix YN, a first pressure sum based on the first vector and a second pressure sum based on the second vector before each time point are calculated in chronological order, and according to the pressure difference between the first pressure sum and the second pressure sum, whether a material adding time point needs to be set; If the pressure difference is less than the set difference, at this time, the alarm will send a material adding instruction, and combined with Tx+ Determine the earliest time to add and combine Determine the latest addition time point, where Tx represents the time point when the pressure difference is less than the set difference; represents the unit control time for pressure; represents the number of time points before Tx in the pressure matrix YN; , Respectively represent the first pressure and the second pressure at the i1th time point; Indicates setting difference; Respectively represent the maximum value of the first pressure and the maximum value of the second pressure involved before Tx; The earliest adding time point and the latest adding time point are output to the corresponding display screen for display reminder.

[0013] Preferably, it also includes: Continuously photographing material images of the output material discharged onto the second conveyor belt based on a photographing device disposed below the discharge port; The photographing device is connected to the processor; Selecting the target impurities in the material image according to a preset accuracy to obtain a selected image; Analyze each framed image taken continuously to determine the proportion of material impurities in each framed image; If the impurity ratio of any material is less than the preset impurity ratio, the material is considered qualified; Otherwise, determine the impurity level ZD;

[0014]

[0015] Among them, P represents the number of box selection images; represents the decision function of the o1th frame selection image; Indicates the proportion of material impurities in the o1th frame selection image; Indicates the preset impurity ratio; When the impurity level ZD is greater than a preset level, the control piston works at maximum power; Otherwise, the control piston continues to operate at the current power.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This application is equipped with two hydraulic cylinders and is independently controlled. The pistons in the two cylinders overlap to a certain extent when they are running. When the piston on one side approaches the end of the cylinder and is about to return, the piston on the other side has already moved forward a short distance in the cylinder. In this way, there is always material transported forward in the pipeline, which is a constant flow transport. In this way, the transport pressure will not frequently switch between high and low, which can increase the service life of the hydraulic components of the hydraulic station and the entire equipment.

[0017] 2. By setting up the first pressure sensor, the second pressure sensor, the processor, the alarm and the display screen, the material input and output can be monitored in real time to effectively ensure that the materials that need to be punched can be provided in time to avoid affecting the constant flow work efficiency due to the lack of materials.

[0018] 3. By setting up shooting equipment, it is convenient to conduct reasonable analysis on the material size and uniformity of the output materials, so as to ensure the rationality of the materials and further ensure the reliability of the subsequent engineering applications of the materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a structural diagram of a constant flow lift valve pump provided by an embodiment of the present invention; Figure 2 This is a working diagram of step 2 in an embodiment of the present invention; Figure 3 This is a working diagram of step 3 in an embodiment of the present invention; Figure 4 This is a working diagram of step 4 in an embodiment of the present invention; Figure 5 This is a working diagram of step 5 in an embodiment of the present invention; Figure 6 1 is an electrical correlation diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 the present invention.

[0022] The present invention provides a constant flow lift valve pump, such as Figure 1 As shown, it comprises: a base 1, and a left valve pump assembly 2, a right valve pump assembly 3 and a water tank 4 are respectively fixed on the upper end of the base 1; The left valve pump assembly 2 and the right valve pump assembly 3 are respectively embedded in and penetrate the middle of the water tank 4 .

[0023] Preferably, the left valve pump assembly 2 comprises: a left hydraulic cylinder 21, a left material cylinder 22, a cone valve cylinder 123, a cone valve cylinder 224, a material suction chamber 125, and a material pressing chamber 126; The left hydraulic cylinder 21 is embedded and penetrates the middle of the water tank 4, and then the left material cylinder 22, the material suction chamber 125, the material pressing chamber 126, and the cone valve cylinder 224 are arranged in sequence from right to left; The cone valve cylinder 123 is located at the lower part of the suction chamber 125; The right valve pump assembly 3 includes: a right hydraulic cylinder 31, a right material cylinder 32, a cone valve cylinder 333, a cone valve cylinder 434, a material suction chamber 235, and a material pressing chamber 236; The right hydraulic cylinder 31 is embedded and penetrates the middle of the water tank 4, and then the right material cylinder 32, the material suction chamber 235, the material pressing chamber 236, and the cone valve cylinder 434 are arranged in sequence from right to left; The cone valve cylinder 333 is located at the lower part of the suction chamber 235; A feed port 5 is disposed at the top of the suction cavity 125 and the suction cavity 235 , and a discharge port 6 is disposed at the bottom of the pressing cavity 126 and the pressing cavity 236 .

[0024] The present invention provides a logic control method of a constant current lift valve pump, which is applied to a constant current lift valve pump and comprises: Step 1: Detect the positions of the corresponding pistons in the left hydraulic cylinder and the right hydraulic cylinder through the magnetic displacement sensor, and transmit the detection data of the magnetic displacement sensor to the PLC module to identify the specific positions of the first piston of the left hydraulic cylinder and the second piston of the right hydraulic cylinder. At this time, the control logic of the constant current lift valve pump starts to work; Step 2: The second piston controlled by the right hydraulic cylinder moves forward. At this time, the cone valve cylinder 3 is in a closed state and the cone valve cylinder 4 is in an open state. When the second piston reaches the preset position 1 from the end of the stroke, the first piston controlled by the left hydraulic cylinder moves forward from the zero position. At the same time, the three-position four-way solenoid valve controls the cone valve cylinder 1 to close and the cone valve cylinder 2 to close after being energized. The material moves forward in the left material cylinder. The piston corresponding to the left hydraulic cylinder pushes the material forward to squeeze the gap but does not punch the material. The piston corresponding to the right hydraulic cylinder punches the material. Figure 2 As shown; Step 3: The first piston of the left hydraulic cylinder continues to move forward, the cone valve cylinder 1 is in a closed state, the cone valve cylinder 2 is in a closed state, and the material moves forward in the left cylinder. Since the material is not filled, the material squeezes the gap in the left cylinder and builds up a certain pressure. The second piston of the right hydraulic cylinder continues to move toward the end of the stroke, the corresponding cone valve cylinder 3 is in a closed state, the cone valve cylinder 4 is in an open state, the piston corresponding to the left hydraulic cylinder is in a pressure-building state, and the piston corresponding to the right hydraulic cylinder continues to punch the material, such as Figure 3 As shown; Step 4: When the second piston of the right hydraulic cylinder moves to the preset position 2 away from the end of the working stroke, the magnetostrictive displacement sensor signal is triggered. After the electromagnetic proportional valve and the three-position four-way electromagnetic valve are energized, the cone valve cylinder 3 is opened and the cone valve cylinder 4 is closed. At the same time, the electromagnetic proportional valve and the three-position four-way electromagnetic valve are energized to control the cone valve cylinder 2 to open, and the cone valve cylinder 1 is still in the closed state. The first piston of the left hydraulic cylinder continues to move forward, and the piston corresponding to the left hydraulic cylinder starts to punch the material, while the piston corresponding to the right hydraulic cylinder quickly moves backward to start sucking the material. Figure 4 As shown; Step 5: The first piston of the left hydraulic cylinder continues to move forward, and the piston corresponding to the left hydraulic cylinder continues to punch the material. When the second piston of the right hydraulic cylinder quickly moves backward to the starting point of the stroke, the magnetostrictive displacement sensor signal is triggered. After the solenoid proportional valve and the three-position four-way solenoid valve are energized, the second piston of the right hydraulic cylinder moves forward, the cone valve cylinder 3 is closed, the cone valve cylinder 4 is closed, and the piston corresponding to the left hydraulic cylinder continues to punch the material; the piston corresponding to the right hydraulic cylinder starts to push the material forward in the right material cylinder, and the material is gradually compacted and pressure is built up. Figure 5 shown.

[0025] Based on steps 1 to 5, the pistons corresponding to the two hydraulic cylinders operate alternately to achieve constant pressure and constant flow transportation of materials in the pipeline.

[0026] Preferably, the left hydraulic cylinder and the right hydraulic cylinder are respectively provided with a magnetostrictive displacement sensor.

[0027] Preferably, the preset distance is 50-60 cm.

[0028] In this embodiment, the material at the outlet of the constant flow lift valve pump is continuously transported, the material in the pipeline is continuous and uninterrupted, and the reversing structure is in the form of four cone valves. The two hydraulic cylinders are independently operated and not connected to each other. The four cone valve cylinders are independently controlled by four solenoid valves to open and close the cone valves.

[0029] In this embodiment, if Figure 6 The electrical action diagram is shown.

[0030] The beneficial effect of the above technical solution is that two hydraulic cylinders are provided and controlled independently, and the pistons in the two cylinders overlap to a certain extent when they are running. When the piston on one side approaches the end of the cylinder and is about to return, the piston on the other side has already moved forward a short distance in the cylinder, so that materials are always transported forward in the pipeline, which is a constant flow transport. In this way, the transport pressure will not frequently switch between high and low, which can increase the service life of the hydraulic components of the hydraulic station and the entire equipment.

[0031] The present invention provides a logic control method for a constant current lift valve pump, further comprising: Based on a first pressure sensor of a first conveyor belt arranged at the feed inlet, a first pressure of conveying materials to the feed inlet is detected in real time; Based on a second pressure sensor of a second conveyor belt arranged at the discharge port, a second pressure of the material output from the discharge port is detected in real time; The processor arranged on the base is connected to the second pressure sensor and the second pressure sensor respectively, and the processor is also connected to the alarm and the display screen arranged on the base.

[0032] Preferably, it also includes: Based on the first pressure detected in real time and the second pressure detected in real time, a pressure matrix is ​​constructed. ,in, , A first vector constructed based on the first pressure and a second vector constructed based on the second pressure in a continuous time period before the current moment are constructed respectively; locking The first occurrence position of the element that is not 0 in the first occurrence position, and the initial non-appearance continuous duration Tc is counted based on the first occurrence position, and the first time deviation is obtained based on the processor ;

[0033] in, represents the predefined discharging time period based on the second pressure; t0 represents the continuous duration on both sides of the corresponding surrounding time point around T0 based on the predefined time; According to the first time deviation Tp, a first alarm instruction is issued to the alarm device; Based on the pressure matrix YN, a first pressure sum based on the first vector and a second pressure sum based on the second vector before each time point are calculated in chronological order, and according to the pressure difference between the first pressure sum and the second pressure sum, whether a material adding time point needs to be set; If the pressure difference is less than the set difference, at this time, the alarm will send a material adding instruction, and combined with Tx+ Determine the earliest time to add and combine Determine the latest addition time point, where Tx represents the time point when the pressure difference is less than the set difference; represents the unit control time for pressure; represents the number of time points before Tx in the pressure matrix YN; , Respectively represent the first pressure and the second pressure at the i1th time point; Indicates setting difference; Respectively represent the maximum value of the first pressure and the maximum value of the second pressure involved before Tx; The earliest adding time point and the latest adding time point are output to the corresponding display screen for display reminder.

[0034] In this embodiment, the time deviation is used to remind whether there is any control error in the material discharging process, and the time deviation is calculated for the first time, so that if there is any problem with the valve pump, it can be dealt with in time.

[0035] The beneficial effect of the above technical solution is: by setting up the first pressure sensor, the second pressure sensor, the processor, the alarm and the display screen, the material input and output volume can be monitored in real time to effectively ensure that the materials that need to be punched can be provided in time, avoiding the impact of constant flow work efficiency due to material shortage.

[0036] A logic control method for a constant current lift valve pump, further comprising: Continuously photographing material images of the output material discharged onto the second conveyor belt based on a photographing device disposed below the discharge port; The photographing device is connected to the processor; Selecting the target impurities in the material image according to a preset accuracy to obtain a selected image; Analyze each framed image taken continuously to determine the proportion of material impurities in each framed image; If the impurity ratio of any material is less than the preset impurity ratio, the material is considered qualified; Otherwise, determine the impurity level ZD;

[0037]

[0038] Among them, P represents the number of box selection images; represents the decision function of the o1th frame selection image; Indicates the proportion of material impurities in the o1th frame selection image; Indicates the preset impurity ratio; When the impurity level ZD is greater than a preset level, the control piston works at maximum power; Otherwise, the control piston continues to operate at the current power.

[0039] In this embodiment, the impurity ratio is preset and its value is 0.2.

[0040] In this embodiment, the presence of impurities may block the pipeline, causing the material to be unable to pass smoothly. Therefore, in order to avoid this situation, the material is photographed and analyzed.

[0041] In this embodiment, the material impurity ratio=the area occupied by the impurities in the corresponding material image / the area of ​​the corresponding material image.

[0042] The beneficial effect of the above technical solution is: by setting up a shooting device, it is convenient to determine the impurities present in the output material, effectively determine whether the material needs quality reminder, and avoid affecting the normal operation of the valve pump due to too many impurities.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A constant flow lift valve pump, characterized in that: include: A base (1), wherein a left valve pump assembly (2), a right valve pump assembly (3) and a water tank (4) are respectively fixed to the upper end of the base (1); The left valve pump assembly (2) and the right valve pump assembly (3) are respectively embedded in and penetrate the middle of the water tank (4).

2. The constant flow lift valve pump according to claim 1, characterized in that: The left valve pump assembly (2) comprises: a left hydraulic cylinder (21), a left material cylinder (22), a cone valve cylinder 1 (23), a cone valve cylinder 2 (24), a material suction chamber 1 (25), and a material pressing chamber 1 (26); The left hydraulic cylinder (21) is embedded in and penetrates the middle of the water tank (4), and is provided with a left material cylinder (22), a material suction chamber 1 (25), a material pressing chamber 1 (26), and a cone valve cylinder 2 (24) in sequence from right to left; The cone valve cylinder 1 (23) is located at the lower part of the suction chamber 1 (25); The right valve pump assembly (3) comprises: a right hydraulic cylinder (31), a right material cylinder (32), a cone valve cylinder 3 (33), a cone valve cylinder 4 (34), a material suction chamber 2 (35), and a material pressing chamber 2 (36); The right hydraulic cylinder (31) is embedded in and penetrates the middle of the water tank (4), and is then provided with a right material cylinder (32), a material suction chamber 2 (35), a material pressing chamber 2 (36), and a cone valve cylinder 4 (34) in sequence from right to left; The cone valve cylinder 3 (33) is located at the lower part of the suction chamber 2 (35); The tops of the suction chamber 1 (25) and the suction chamber 2 (35) are provided with feed ports (5), and the bottoms of the pressing chamber 1 (26) and the pressing chamber 2 (36) are provided with discharge ports (6).

3. A logic control method for a constant current lift valve pump, applied to the constant current lift valve pump according to any one of claims 1-2, characterized in that: include: Step 1: Detect the positions of the corresponding pistons in the left hydraulic cylinder and the right hydraulic cylinder through the magnetic displacement sensor, and transmit the detection data of the magnetic displacement sensor to the PLC module to identify the specific positions of the first piston of the left hydraulic cylinder and the second piston of the right hydraulic cylinder. At this time, the control logic of the constant current lift valve pump starts to work; Step 2: The second piston controlled by the right hydraulic cylinder moves forward. At this time, the cone valve cylinder 3 is in a closed state and the cone valve cylinder 4 is in an open state. When the second piston reaches the preset position 1 from the end of the stroke, the first piston controlled by the left hydraulic cylinder moves forward from the zero position. At the same time, the three-position four-way solenoid valve controls the cone valve cylinder 1 to close and the cone valve cylinder 2 to close after being energized. The material moves forward in the left material cylinder. The piston corresponding to the left hydraulic cylinder pushes the material forward to squeeze the gap but does not punch the material. The piston corresponding to the right hydraulic cylinder punches the material. Step 3: The first piston of the left hydraulic cylinder continues to move forward, the cone valve cylinder 1 is in a closed state, the cone valve cylinder 2 is in a closed state, and the material moves forward in the left cylinder. Since the material is not filled, the material squeezes the gap in the left cylinder and builds up a certain pressure. The second piston of the right hydraulic cylinder continues to move toward the end of the stroke, the corresponding cone valve cylinder 3 is in a closed state, the cone valve cylinder 4 is in an open state, the piston corresponding to the left hydraulic cylinder is in a pressure-building state, and the piston corresponding to the right hydraulic cylinder continues to punch the material; Step 4: When the second piston of the right hydraulic cylinder moves to the preset position 2 away from the end of the working stroke, the magnetostrictive displacement sensor signal is triggered. After the electromagnetic proportional valve and the three-position four-way electromagnetic valve are energized, the cone valve cylinder 3 is opened and the cone valve cylinder 4 is closed. At the same time, the electromagnetic proportional valve and the three-position four-way electromagnetic valve are energized to control the cone valve cylinder 2 to open, and the cone valve cylinder 1 is still in a closed state. The first piston of the left hydraulic cylinder continues to move forward, and the piston corresponding to the left hydraulic cylinder starts to punch the material, while the piston corresponding to the right hydraulic cylinder quickly moves backward to start sucking the material; Step 5: The first piston of the left hydraulic cylinder continues to move forward, and the piston corresponding to the left hydraulic cylinder continues to punch materials. When the second piston of the right hydraulic cylinder quickly moves backward to the starting point of the stroke, the magnetostrictive displacement sensor signal is triggered. After the solenoid proportional valve and the three-position four-way solenoid valve are energized, the second piston of the right hydraulic cylinder moves forward, the cone valve cylinder 3 is closed, the cone valve cylinder 4 is closed, and the piston corresponding to the left hydraulic cylinder continues to punch materials; the piston corresponding to the right hydraulic cylinder begins to push the material forward in the right material cylinder, and the material is gradually compacted and pressure is built up.

4. The logic control method of the constant flow lift valve pump according to claim 3, characterized in that: The left hydraulic cylinder and the right hydraulic cylinder are respectively provided with a magnetostrictive displacement sensor.

5. The logic control method of the constant flow lift valve pump according to claim 3, characterized in that: The preset distance is 50-60cm.

6. The logic control method of the constant flow lift valve pump according to claim 3, characterized in that: Also includes: Based on a first pressure sensor of a first conveyor belt arranged at the feed inlet, a first pressure of conveying materials to the feed inlet is detected in real time; Based on a second pressure sensor of a second conveyor belt arranged at the discharge port, a second pressure of the material output from the discharge port is detected in real time; The processor arranged on the base is connected to the second pressure sensor and the second pressure sensor respectively, and the processor is also connected to the alarm and the display screen arranged on the base.

7. The logic control method of the constant flow lift valve pump according to claim 5, characterized in that: Also includes: Based on the first pressure detected in real time and the second pressure detected in real time, a pressure matrix is ​​constructed. ,in, , A first vector constructed based on the first pressure and a second vector constructed based on the second pressure in a continuous time period before the current moment are constructed respectively; locking The first occurrence position of the element that is not 0 in the first occurrence position, and the initial non-appearance continuous duration Tc is counted based on the first occurrence position, and the first time deviation is obtained based on the processor ; in, represents the predefined discharging time period based on the second pressure; t0 represents the continuous duration on both sides of the corresponding surrounding time point around T0 based on the predefined time; According to the first time deviation Tp, a first alarm instruction is issued to the alarm device; Based on the pressure matrix YN, a first pressure sum based on the first vector and a second pressure sum based on the second vector before each time point are calculated in chronological order, and according to the pressure difference between the first pressure sum and the second pressure sum, whether a material adding time point needs to be set; If the pressure difference is less than the set difference, at this time, the alarm will send a material adding instruction, and combined with Tx+ Determine the earliest time to add and combine Determine the latest addition time point, where Tx represents the time point when the pressure difference is less than the set difference; represents the unit control time for pressure; represents the number of time points before Tx in the pressure matrix YN; , Respectively represent the first pressure and the second pressure at the i1th time point; Indicates setting difference; Respectively represent the maximum value of the first pressure and the maximum value of the second pressure involved before Tx; The earliest adding time point and the latest adding time point are output to the corresponding display screen for display reminder.

8. The logic control method of the constant flow lift valve pump according to claim 5, characterized in that: Also includes: Continuously photographing material images of the output material discharged onto the second conveyor belt based on a photographing device disposed below the discharge port; The photographing device is connected to the processor; Selecting the target impurities in the material image according to a preset accuracy to obtain a selected image; Analyze each framed image taken continuously to determine the proportion of material impurities in each framed image; If the impurity ratio of any material is less than the preset impurity ratio, the material is considered qualified; Otherwise, determine the impurity level ZD; Among them, P represents the number of box selection images; represents the decision function of the o1th frame selection image; Indicates the proportion of material impurities in the o1th frame selection image; Indicates the preset impurity ratio; When the impurity level ZD is greater than a preset level, the control piston works at maximum power; Otherwise, the control piston continues to operate at the current power.

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