Roller press roll gap control device and control method thereof

Abstract

The invention relates to the technical field of roller presses, and discloses a roller press roller gap control device and a control method thereof.The roller press roller gap control device comprises a first roller and a second roller which are oppositely arranged, and a roller gap is formed between the first roller and the second roller; the execution module is in driving connection with the first roller, and the first control module is connected with the execution module to control the execution module to drive the first roller to move to a first set position so as to preliminarily adjust a roller gap; and the second control module is connected with the execution module to control the execution module to drive the first roller to move to a second set position so as to adjust the roller gap for the second time. The first control module and the second control module are adopted to achieve secondary movement control over the first roller, so that direct measurement of the roller gap is achieved, the influence of the bearing gap, the influence of memorial archway deformation and the influence of the oil temperature of an oil cylinder are avoided, the deviation between the thickness of a pole piece and the set position of the roller gap is effectively reduced, and the measurement precision is improved. And the pole piece thickness and the roll gap position linearity are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of roller presses, and in particular relates to a roller gap control device for a roller press and a control method thereof. Background Art

[0002] The roller press is designed according to the principle of bed grinding. Its main features are: high pressure, full speed, full material, and bed crushing. The roller press consists of two extrusion rollers that rotate synchronously in opposite directions, one is a fixed roller and the other is a movable roller. The material is fed from above the two rollers and is continuously brought into the roller space by the extrusion rollers. After being subjected to a high pressure of 100-150MPa, it becomes a dense cake and is discharged from the bottom of the machine.

[0003] In the existing roll gap detection and closed-loop control of roller presses, the roll gap is indirectly measured and controlled using a magnetostrictive sensor installed in the oil cylinder. That is, the position of the oil cylinder is adjusted to push the lower roller up and down, thereby indirectly adjusting the roll gap size.

[0004] However, this method is an indirect measurement and control of the roll gap size, not the actual roll gap value. Due to the influence of factors such as pressure size, arch deformation, bearing seat gap, etc., it is difficult to match the measured value of the magnetostrictive sensor with the actual roll gap value, and there is a phenomenon of poor linearity between the pole piece thickness and the roll gap position; and the equipment stability is poor, and the process capability index CPK and σ value of the pole piece thickness produced by rolling are very low. Summary of the invention

[0005] In order to solve the shortcomings of the prior art, the present invention provides a roller gap control device for a roller press. Through the design of a first control module and a second control module, the first control module controls the execution module to drive the movement of the first roller, and the second control module controls the execution module to drive the movement of the first roller again to adjust the roll gap size, thereby realizing direct measurement of the roll gap, and thus is not affected by the bearing gap, the arch deformation, and the cylinder oil temperature; the deviation between the pole piece thickness and the set roll gap position is small; the linearity of the pole piece thickness and the roll gap position is effectively improved, and the operation is simple; at the same time, the stability of the equipment operation is ensured, thereby greatly improving the stability of the pole piece thickness after rolling.

[0006] The technical effects to be achieved by the present invention are achieved through the following aspects:

[0007] In a first aspect, the present invention provides a roller gap control device for a roller press, comprising:

[0008] The roller module comprises a first roller and a second roller which are arranged opposite to each other, and a roller gap is formed between the first roller and the second roller;

[0009] an execution module, drivingly connected to the first roller to control the movement of the first roller;

[0010] a first control module connected to the execution module to control the execution module to drive the first roller to move to a first set position to preliminarily adjust the roller gap; and

[0011] The second control module is connected to the execution module to control the execution module to drive the first roller to move to a second set position to perform a second adjustment of the roller gap.

[0012] In some implementations, the first control module includes:

[0013] A first sensing component, used for sensing and converting the signal of the roller gap; and

[0014] A regulating component is connected between the first sensing component and the execution module, receives and processes the signal of the roll gap and the target value of the roll gap, and transmits an action signal to the execution module.

[0015] In some implementations, the first sensing component includes:

[0016] A first sensor, used for measuring a position signal of the roll gap; and

[0017] The first analog quantity unit is connected between the first sensor and the regulating component, so that the first analog quantity unit receives the position signal of the roller gap measured by the first sensor and converts it into an analog quantity to transmit to the regulating component.

[0018] In some implementations, the control component includes a hydraulic controller and a position control unit, and the position control unit is connected between the first analog quantity unit and the hydraulic controller;

[0019] The position control unit feeds back the position signal of the roll gap to the hydraulic controller, and the hydraulic controller combines the position signal fed back by the position control unit and the target value of the roll gap, and transmits an action signal to the execution module.

[0020] In some implementations, the second control module includes:

[0021] A second sensor is disposed on both sides of the roll gap and is used to measure a position signal of the roll gap;

[0022] a control unit connected to the second sensor, and

[0023] The second analog quantity unit is connected to the control unit. The second analog quantity unit receives the position signal measured by the second sensor through the control unit, and converts it into an analog quantity and transmits it to the regulating component.

[0024] In some implementations, the execution module includes: a hydraulic cylinder connected to the first sensor, the first sensor sensing the movement amount of the first roller pushed by the hydraulic cylinder to indirectly obtain the position of the roller gap; and

[0025] A servo valve is connected between the regulating component and the hydraulic cylinder.

[0026] In some implementations, the hydraulic controller includes:

[0027] A PID calculation unit, used for calculating the position deviation of the roll gap in real time and outputting the roll gap adjustment signal; and

[0028] The feedforward calculation unit is connected to the PID calculation unit and is used to compare the adjustment signal output by the PID calculation unit with the target value of the roll gap and output a compensation action.

[0029] In a second aspect, the present invention provides a roller press roll gap control method, using the above-mentioned roller press roll gap control device, comprising the following steps:

[0030] S1, setting the roll gap positioning value; presetting the roll gap size after the first roll moves as the first positioning value, and presetting the roll gap size after the first roll moves for the second time as the second positioning value;

[0031] S2, controlling the first roller to move to the first set position; the first control module controls the execution module to drive the first roller, and moves the first roller to the first set position according to the first positioning value;

[0032] S3, controlling the first roller to move to the second set position; the second control module controls the execution module to drive the first roller, and moves the first roller to the second set position according to the second positioning value; and finally achieving the desired roller gap.

[0033] In some implementations, before step S1, the method further includes step S4: calibration of the roller gap, which is used to calibrate the control accuracy of the first control module and the second control module.

[0034] In some implementations, in S4, the following steps are included:

[0035] S41, adjusting the roller gap distance to 0; the first roller rises until it completely touches the second roller;

[0036] S42, calculating the calibration value; pressing the calibration button on the human-machine interface, and setting the calibration value of the second control module to D0, the distance from the second control module to the side end of the first roller to D1, and the distance from the second control module to the side end of the second roller to D2, specifically D0=D1+D2;

[0037] S43, calculating the roll gap d: specifically, d=(D1+D2)-D0.

[0038] In summary, the present invention has at least the following benefits:

[0039] The roller gap control device of the roller press provided by the present invention controls the movement of the first roller through the first control module, specifically, the first sensor measures the position signal of the roller gap, and converts the position signal into an analog quantity through the first analog quantity unit, and transmits it to the control component for processing, and combines the first positioning value and the position signal of the roller gap, and then transmits the movement displacement signal of the first roller to the execution module, so that the first roller of the execution module moves to the first set position, thereby realizing the movement of the first roller. Then switch the second control module to control the execution module to drive the movement of the first roller for a second time, specifically, the second sensor senses the roller gap distance after the first roller moves, and then combines the setting of the second positioning value, the second sensor measures the position signal of the roller gap, and converts its signal into an analog quantity received by the control component through the second analog quantity unit, and combines the second positioning value and the position signal of the roller gap, and then transmits the movement signal of the first roller to the execution module for a second time, until the first roller moves to the second set position.

[0040] 1. The roll gap control operation of the present invention can realize direct measurement of the roll gap, and thus can be unaffected by the bearing clearance, the deformation of the arch, and the oil temperature of the oil cylinder, ensuring the precise adjustment of the roll gap and greatly reducing the deviation between the pole piece thickness and the roll gap setting position. For example, if the required pole piece thickness is 120μm, the roll gap setting position only needs to be set to 90-100μm. And for every 1μm change in the thickness of the pole piece, the roll gap setting value only needs to change by 1-2μm, effectively improving the linearity between the pole piece thickness and the roll gap position, and the operation is simple.

[0041] 2. The roller gap control device of the roller press provided by the present invention controls the movement of the first roller twice by using the first control module and the second control module respectively. The actions are independent and the roller gap can be accurately adjusted. When calibrating at zero point, it is not affected by the pressure during calibration, ensuring that the roller gap remains stable, thereby achieving the stability of the equipment operation and greatly improving the balance of the electrode thickness after rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of the structure of the roller gap control device of the roller press in Example 1.

[0043] Figure 2 This is a schematic diagram of the structure of the roller gap control device of the roller press in Example 2.

[0044] Figure 3 This is a closed-loop logic diagram of the first control module in Example 2.

[0045] Figure 4 This is a closed-loop logic diagram of the second control module in Example 2.

[0046] Figure 5 This is a flow chart of switching from the first control module to the second control module in Example 2.

[0047] Figure 6 This is a flow chart of the roller gap control method of the roller press in Example 3.

[0048] Figure 7 This is a flow chart of the calibration of the roll gap in Example 3.

[0049] Figure 8 This is a schematic diagram of the structure of the roller gap measurement in Example 3.

[0050] Markings in the figure:

[0051] 1. Roller module, 11. First roller, 12. Second roller, 13. Roll gap; 2. First control module, 21. First sensing component, 211. First sensor, 212. First analog quantity unit, 22. Control component, 221. Hydraulic controller, 2211. PID operation unit, 2212. Feedforward calculation unit, 222. Position control unit; 3. Second control module, 31. Second sensor, 32. Control unit, 33. Second analog quantity unit; 4. Execution module, 41. Hydraulic cylinder, 42. Servo valve. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them.

[0053] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0054] Embodiment 1:

[0055] Please see attached Figure 1The roller gap control device of the roller press of the present invention includes a roller module 1, an execution module 4, a first control module 2 and a second control module 3.

[0056] The roller module 1 comprises a first roller 11 and a second roller 12 which are arranged opposite to each other, and a roller gap 13 is formed between the first roller 11 and the second roller 12 .

[0057] The execution module 4 is drivingly connected to the first roller 11 to control the movement of the first roller 11 .

[0058] The first control module 2 is connected to the execution module 4 to control the execution module 4 to drive the first roller 11 to move to the first set position to perform a preliminary adjustment of the roller gap 13 .

[0059] The second control module 3 is connected to the execution module 4 to control the execution module 4 to drive the first roller 11 to move to the second set position to perform a second adjustment of the roller gap 13 .

[0060] In the roller gap control device of the roller press in this embodiment, the roller gap 13 is adjusted according to the roller gap target value, and the first roller 11 is controlled and moved twice to achieve it. Specifically, the first control module 2 transmits a corresponding action signal to the execution module 4 according to the existing roller gap 13 and the roller gap target value set initially, thereby driving the first roller 11 to move to the first set position, thereby achieving a one-time adjustment of the roller gap 13. Then, it automatically switches to the second control module 3, and transmits a corresponding action signal to the execution module 4 according to the roller gap 13 adjusted by the execution module 4 and the roller gap 13 target value set twice, thereby driving the first roller 11 to move to the second set position twice, so as to accurately complete the adjustment of the roller gap 13. Since the first roller 11 is affected by factors such as pressure, arch deformation, and bearing seat clearance during the process of adjusting the position, the first roller 11 may not move into place, and there may be a certain deviation. Then, the second control module 3 performs a secondary control on the moving position of the first roller 11 in combination with the roller gap demand, until the deviation existing in the movement process of the first roller 11 is eliminated, so as to achieve accurate adjustment of the roller gap 13.

[0061] Through the above-mentioned roll gap adjustment operation process, the first control module 2 uses an indirect mode to monitor and move the first roller 11, and the second control module 3 uses two control modules for monitoring based on direct monitoring of the roll gap and secondary adjustment control of the first roller 11. Combined with the adjustment of the roll gap 13 twice, the roll gap adjustment deviation caused by factors such as bearing clearance, arch deformation, and cylinder oil temperature can be corrected, thereby ensuring the accuracy of the roll gap adjustment. At the same time, the deviation between the pole piece thickness and the roll gap setting position can be greatly reduced, that is, when the required pole piece thickness is 120μm, the roll gap setting position only needs to be set to 90~100μm. And for every 1μm change in the thickness of the pole piece, the roll gap setting value only needs to change by 1~2μm, thereby effectively improving the linearity of the pole piece thickness and the roll gap position.

[0062] In this structure, the operation of roller gap adjustment is simple. The first control module 2 and the second control module 3 are used to adjust the first roller 11 twice respectively. When calibrating at zero point, it is not affected by the pressure during calibration, ensuring accurate adjustment of the roller gap, so that the distance between the first roller 11 and the second roller 12 is maintained stable, effectively ensuring the balance of the electrode thickness after rolling, and achieving stability in equipment operation.

[0063] Embodiment 2:

[0064] The difference between this embodiment and embodiment 1 is that, see Figure 2-Figure 3 In this embodiment, the first control module 2 includes a first sensing component 21 and a regulating component 22 .

[0065] The first sensing component 21 is used to sense and convert the signal of the roll gap. Specifically, the first sensing component 21 includes a first sensor 211 and a first analog quantity unit 212. The first sensor 211 is a magnetostrictive sensor, which is used to measure the position signal of the roll gap. The first analog quantity unit 212 is connected between the first sensor 211 and the control component 22, so that the first analog quantity unit 212 receives the position signal of the roll gap measured by the first sensor 211, and converts it into an analog quantity and transmits it to the control component 22.

[0066] The regulating component 22 is connected between the first sensing component 21 and the execution module 4 , receives and processes the signal of the roll gap and the target value of the roll gap, and transmits an action signal to the execution module 4 .

[0067] Specifically, the control component 22 includes a hydraulic controller 221 and a position control unit 222. The position control unit 222 is connected between the first analog unit 212 and the hydraulic controller 221. The position control unit 222 feeds back a position signal of the roll gap to the hydraulic controller 221. The hydraulic controller 221 combines the position signal fed back by the position control unit 222 and the target value of the roll gap, and transmits an action signal to the execution module 4.

[0068] The hydraulic controller 221 includes a PID operation unit 2211 and a feedforward calculation unit 2212. The PID operation unit 2211 is used to perform real-time calculation of the position deviation of the roll gap and output a roll gap adjustment signal; the feedforward calculation unit 2212 is connected to the PID operation unit 2211 and is used to compare the adjustment signal output by the PID operation unit 2211 with the target value of the roll gap and output a compensation action. The hydraulic controller 221 can effectively improve the accuracy of controlling the action of the first roller 11 and reduce the movement deviation through the coordinated use of the PID operation unit 2211 and the feedforward calculation unit 2212.

[0069] The first control module 2 in this embodiment sets the first positioning value of the roll gap at 1.5 mm in the internal control system, adopts a magnetostrictive sensor as the input of the closed-loop control, namely, an MTS sensor, and indirectly monitors the roll gap by sensing the position of the hydraulic cylinder 41, and transmits the position signal to the first analog unit 212 for signal conversion, and then transmits the analog signal to the hydraulic controller 221 through the position control unit 222. The hydraulic controller 221 combines the roll gap target value and the position signal fed back by the position control unit 222. The hydraulic controller 221 adopts the PID operation unit 2211 to perform ramp curve closed-loop PID control according to the first positioning value of the roll gap, so that the current value follows the first positioning value ramp curve, and outputs a compensation action through the feedforward calculation unit 2212, and then transmits an action signal to the execution module 4, driving the execution module 4 to adjust the roll gap to the first positioning value, thereby effectively ensuring the accuracy of the adjustment of the first roller 11.

[0070] The execution module 4 includes a hydraulic cylinder 41 and a servo valve 42. The hydraulic cylinder 41 is connected to the first sensor 211, and the first sensor 211 senses the movement of the first roller 11 pushed by the hydraulic cylinder 41 to indirectly obtain the position of the roller gap. The servo valve 42 is connected between the control component 22 and the hydraulic cylinder 41.

[0071] Through the setting of the execution module 4, after receiving the action signal from the hydraulic controller 221, the execution module 4 controls the opening of the servo valve 42 to adjust the pressure of the rodless chamber and the rod chamber of the hydraulic cylinder 41, thereby pushing the first roller 11 to rise to the set position.

[0072] As described above, the first control module 2 and the execution module 4 cooperate to achieve the initial adjustment of the position of the first roller 11, which can ensure the accuracy of the movement of the first roller 11 and greatly reduce the movement error.

[0073] In some embodiments, see Figure 2 and Figure 4 The second control module 3 includes a second sensor 31 , a control unit 32 and a second analog quantity unit 33 .

[0074] The second sensor 31 is arranged on both sides of the roller gap to measure the position signal of the roller gap. The second sensor 31 adopts a high-precision capacitive sensor. The position setting of the second sensor 31 can directly measure the gap size between the first roller 11 and the second roller 12. The control unit 32 is connected to the second sensor 31.

[0075] The second analog quantity unit 33 is connected to the control unit 32. The second analog quantity unit 33 receives the position signal measured by the second sensor 31 through the control unit 32, and converts it into an analog quantity and transmits it to the control component 22. This setting can achieve sensing agility, and can also ensure the authenticity of sensing, which can greatly reduce errors.

[0076] In the second control module 3 of this embodiment, after the preliminary adjustment of the first roller 11 is completed, the closed-loop input value is automatically switched from the first sensor 211 to the second sensor 31. The second sensor 31 directly measures the roll gap 13 between the first roller 11 and the second roller 12 after the preliminary adjustment according to the first control module 2, and transmits the roll gap signal to the second analog unit 33 for amplification and conversion processing, and feeds back the analog quantity of the roll gap signal to the hydraulic controller 221 through the position control unit 222 in the control component 22. The hydraulic controller 221 combines and processes the second positioning value and roll gap position signal of the roll gap set in the internal control system, and transmits the execution action to the execution module 4, so as to control the opening of the servo valve 42 to adjust the pressure of the rodless chamber and the rod chamber of the hydraulic cylinder 41, thereby pushing the first roller 11 to rise again to the set position, thereby realizing the secondary adjustment of the first roller 11 until the roll gap is adjusted to the set requirement.

[0077] In addition, when the system is not depressurized, by modifying the roll gap target value on the human-machine interface, the desired roll gap size can be directly achieved through the second control module 3 driving the execution module 4. At this time, the roll gap value measured by the first sensor 211 is no longer used as a reference value for the roll gap size. This setting does not require system reset, is simple to operate, and can flexibly respond to various roll gap requirements.

[0078] See also Figure 5 , and because the first control module 2 drives the execution module 4 to control the first roller 11 for the first time, and then the second control module 3 drives the execution module 4 to control the first roller 11 for the second time, that is, it involves the switching of the closed-loop input quantity, switching from the first sensor 211 to the second sensor 31 to measure the roller gap, so that the execution module 4 performs the corresponding action on the first roller 11. During the switching process between the first sensor 211 and the second sensor 31, the input quantity is smoothed, such as filtering; and the PID operation unit 2211 in the hydraulic controller 221 is automatically paused during the switching process; in addition, after the switching is completed, the closed-loop gain is automatically reduced within a certain period of time to avoid overshoot. The above-mentioned switching method can effectively avoid the phenomenon of violent fluctuations in the roller gap and abnormal noise in the adjustment of the servo valve 42, thereby ensuring that the switching process is free of frustration and greatly improving the stability of the switching.

[0079] The use of the above-mentioned second sensor 31 can realize direct measurement of the roller gap, and is not affected by the bearing clearance, the arch deformation, and the cylinder oil temperature, effectively ensuring the precise adjustment of the roller gap, greatly reducing the deviation between the pole piece thickness and the set position of the roller gap, and improving the linearity of the pole piece thickness and the roller gap position.

[0080] Embodiment 3:

[0081] This embodiment provides a roller gap control method for a roller press based on the above embodiment, as shown in FIG. 6 , and includes the following steps:

[0082] S1, setting the roll gap positioning value; the roll gap size after the first roller 11 moves is preset as the first positioning value, and the roll gap size after the first roller 11 moves is preset as the second positioning value;

[0083] S2, controlling the first roller 11 to move to a first set position; the first control module 2 controls the execution module 4 to drive the first roller 11, and moves the first roller 11 to the first set position according to the first positioning value;

[0084] S3, control the first roller 11 to move to the second set position; the second control module 3 controls the execution module 4 to drive the first roller 11, and moves the first roller 11 to the second set position according to the second positioning value; finally, the desired roller gap 13 is achieved.

[0085] Through the setting of the above method, firstly, the first positioning value and the second positioning value are set in the internal system; secondly, the roll gap 13 is indirectly monitored by the first sensor 211 in the first control module 2, and then the first roller 11 is controlled to move to the first set position, so that the roll gap size is the first positioning value; finally, the roll gap is directly monitored by the second sensor 31 in the second control module 3, and the first roller 11 is controlled to move to the second set position, so that the roll gap size is the second positioning value. By indirectly and directly monitoring the roll gap, the roll gap is adjusted twice, and the direct monitoring of the roll gap does not need to be affected by factors such as bearing clearance, arch deformation, and oil temperature of the oil cylinder, which effectively ensures the accuracy of the roll gap adjustment, greatly reduces the deviation between the pole piece thickness and the roll gap setting position, effectively ensures the accuracy of the roll gap adjustment, improves the pole piece thickness and the linearity of the roll gap position, and thus improves the balance of the pole piece thickness after rolling.

[0086] In some embodiments, before step S1, it also includes S4: calibration of the roll gap, which is used to calibrate the control accuracy of the first control module 2 and the second control module 3. Through the setting of this step, after replacing the first sensor 211 and / or the second sensor 31, it is necessary to calibrate the roll gap in step 4, so as to calibrate the first sensor 211 and the second sensor 31, and ensure the accuracy of subsequent roll gap adjustment.

[0087] In some embodiments, in S4, see Figure 7-Figure 8 , including the following steps:

[0088] S41, adjusting the roller gap distance to 0; the first roller 11 rises until it completely touches the second roller 12;

[0089] S42, calculate the calibration value; press the calibration button on the human-machine interface, and set the calibration value of the second control module 3 to D0, the distance from the second control module 3 to the side end of the first roller 11 to D1, and the distance from the second control module 3 to the side end of the second roller 12 to D2, specifically D0=D1+D2;

[0090] S43, calculate the roll gap d: specifically, d=(D1+D2)-D0.

[0091] Through the above calibration steps, the second sensor 31 in the second control module 3 can directly monitor the roll gap, so that the calibration is not affected by the pressure during calibration, thereby ensuring the accuracy of the calibration and providing a good monitoring basis for subsequent roll gap adjustment. In addition, the calibration steps are simple to operate and can achieve rapid calibration.

[0092] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0094] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0095] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0096] Although the present invention is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A roller gap control device for a roller press, characterized in that: include A roller module (1) comprises a first roller (11) and a second roller (12) arranged opposite to each other, wherein a roller gap (13) is formed between the first roller (11) and the second roller (12); An execution module (4) is drivingly connected to the first roller (11) to control the movement of the first roller (11); A first control module (2) is connected to the execution module (4) to control the execution module (4) to drive the first roller (11) to move to a first set position to perform preliminary adjustment of the roller gap (13); as well as The second control module (3) is connected to the execution module (4) to control the execution module (4) to drive the first roller (11) to move to a second set position to perform a secondary adjustment of the roller gap (13).

2. The roller gap control device of the roller press according to claim 1, characterized in that: The first control module (2) comprises: A first sensing component (21), used for sensing and converting the signal of the roller gap; and A regulating component (22), wherein the regulating component (22) is connected between the first sensing component (21) and the execution module (4), receives and processes the signal of the roller gap and the target value of the roller gap, and transmits an action signal to the execution module (4).

3. The roller gap control device of the roller press according to claim 2, characterized in that: The first sensing component (21) comprises: A first sensor (211) for measuring a position signal of the roll gap; and The first analog quantity unit (212) is connected between the first sensor (211) and the regulating component (22), so that the first analog quantity unit (212) receives the position signal of the roller gap measured by the first sensor (211), converts it into an analog quantity and transmits it to the regulating component (22).

4. The roller gap control device of a roller press according to claim 3, characterized in that: The regulating component (22) comprises a hydraulic controller (221) and a position control unit (222), wherein the position control unit (222) is connected between the first analog quantity unit (212) and the hydraulic controller (221); The position control unit (222) feeds back the position signal of the roll gap to the hydraulic controller (221); the hydraulic controller (221) combines the position signal fed back by the position control unit (222) and the target value of the roll gap, and transmits an action signal to the execution module (4).

5. The roller gap control device of a roller press according to claim 2, characterized in that: The second control module (3) comprises: A second sensor (31) is disposed on both sides of the roll gap (13) and is used to measure a position signal of the roll gap (13); a control unit (32), connected to the second sensor (31), and The second analog quantity unit (33) is connected to the control unit (32), and the second analog quantity unit (33) receives the position signal measured by the second sensor (31) through the control unit (32), and converts it into an analog quantity and transmits it to the regulating component (22).

6. The roller gap control device of a roller press according to claim 2, characterized in that: The execution module (4) comprises: a hydraulic cylinder (41) connected to the first sensor (211), wherein the first sensor (211) senses the amount of movement of the first roller (11) pushed by the hydraulic cylinder (41) to indirectly obtain the position of the roller gap; and A servo valve (42) is connected between the regulating component (22) and the hydraulic cylinder (41).

7. The roller gap control device of a roller press according to claim 4, characterized in that: The hydraulic controller (221) comprises: A PID calculation unit (2211) is used to calculate the position deviation of the roll gap in real time and output the roll gap adjustment signal; and A feedforward calculation unit (2212) is connected to the PID operation unit (2211) and is used to compare the adjustment signal output by the PID operation unit (2211) with the target value of the roller gap and output a compensation action.

8. A roller gap control method for a roller press, characterized in that: The roller gap control device of a roller press according to any one of claims 1 to 7 comprises the following steps: S1, setting the roller gap positioning value; presetting the roller gap size after the first roller (11) moves as the first positioning value, and presetting the roller gap size after the first roller (11) moves for the second time as the second positioning value; S2, controlling the first roller (11) to move to the first set position; the first control module (2) controls the execution module (4) to drive the first roller (11), and moves the first roller (11) to the first set position according to the first positioning value; S3, controls the first roller (11) to move to the second set position; the second control module (3) controls the execution module (4) to drive the first roller (11), and moves the first roller (11) to the second set position according to the second positioning value; and finally reaches the desired roller gap (13).

9. The roller gap control method of a roller press according to claim 8, characterized in that: Before step S1, the method further includes step S4: calibration of the roller gap, which is used to calibrate the control accuracy of the first control module (2) and the second control module (3).

10. The roller gap control method of a roller press according to claim 9, characterized in that: In S4, the following steps are included: S41, adjusting the roller gap distance to 0; the first roller (11) rises until it completely touches the second roller (12); S42, calculating a calibration value; pressing a calibration button on the human-machine interface, and setting the calibration value of the second control module (3) to D0, the distance from the second control module (3) to the side end of the first roller (11) to D1, and the distance from the second control module (3) to the side end of the second roller (12) to D2, specifically D0=D1+D2; S43, calculating the roll gap d: specifically, d=(D1+D2)-D0.

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