Lift control system, lift control method, and polishing and grinding machine for polishing head

Abstract

The application discloses a lifting control system of a grinding head, a lifting control method and a grinding and polishing machine. The lifting control system of the grinding head comprises a grinding assembly, a control assembly and an ammeter. The grinding assembly comprises a first motor, a second motor, a lifting mechanism and a grinding disc. The grinding disc is installed at the bottom of the lifting mechanism. The first motor is installed on the lifting mechanism to drive the grinding disc to rotate. The second motor is in driving connection with the lifting mechanism to drive the lifting mechanism to lift. The control assembly comprises a controller, a quick lifting control component and a slow lifting control component. The quick lifting control component, the slow lifting control component, the first motor and the second motor are electrically connected with the controller. The ammeter is arranged on the second motor to detect the current of the second motor. The application can solve the problem that manual control is used to make micro adjustment on the lifting of the grinding disc (or the polishing disc) in the prior art, so that the labor cost is high, and the efficiency is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing machine control, in particular to a polishing head lifting control system, a polishing head lifting control method and a polishing machine. BACKGROUND

[0002] The swing arm type polishing machine is used for polishing and grinding the surface of organic glass. A rotatable tool disc is installed at the lower end of the lifting mechanism at the front end of the swing arm. According to the processing technology, a grinding disc or a polishing disc can be installed on the tool disc. The grinding disc (or the polishing disc) can be raised or lowered with the lifting mechanism. During processing, the sandpaper (or felt cloth) on the lower surface of the grinding disc (or the polishing disc) contacts the glass surface. The processing amount is controlled by adjusting the downward stroke of the grinding disc (or the polishing disc). The processing amount is controlled by the current of the grinding head motor. The more the downward stroke of the lifting mechanism, the larger the current of the grinding head motor, and the larger the processing amount. The less the downward stroke of the lifting mechanism, the smaller the current of the grinding head motor, and the smaller the processing amount. The processing amount changes with the processing technology flow.

[0003] Currently, in the processing process, the lifting motor is controlled by the up button and the down button on the operation panel to control the grinding disc (or the polishing disc) to rise and fall quickly. When the grinding disc (or the polishing disc) is about to contact the glass surface, a hand crank mechanism is used to adjust the lifting of the grinding disc (or the polishing disc) by a small amount to polish the workpiece, and the current meter for monitoring the current of the grinding head motor is observed. When the current meter value meets the experience value, the lifting is stopped.

[0004] However, in the processing process, the lifting adjustment is frequently performed, and the hand crank mechanism is manually controlled by manpower, which is laborious. At the same time, since the current meter and the hand crank mechanism are not in the same place, the adjustment and observation are not convenient, and the efficiency is low. SUMMARY

[0005] The main purpose of the present application is to provide a polishing head lifting control system, a polishing head lifting control method and a polishing machine to solve the problem of high labor cost and low efficiency caused by manual control of the lifting of the grinding disc (or the polishing disc) by a small amount in the prior art.

[0006] According to one aspect of the present application, a polishing head lifting control system is provided, comprising:

[0007] a grinding assembly, the grinding assembly comprising a first motor, a second motor, a lifting mechanism and a grinding disc, the grinding disc being installed at the bottom of the lifting mechanism, the first motor being installed on the lifting mechanism to drive the grinding disc to rotate, and the second motor being drivingly connected with the lifting mechanism to drive the lifting mechanism to lift;

[0008] A control assembly comprising a controller, a fast lifting control component and a slow lifting control component, the fast lifting control component, the slow lifting control component, the first motor and the second motor are electrically connected with the controller;

[0009] An ammeter arranged on the second motor for detecting the current of the second motor;

[0010] The controller is configured to control the first motor and the second motor according to signals transmitted by the fast lifting control component and the slow lifting control component.

[0011] Further, the fast lifting control component comprises a fast lifting-up button and a fast lifting-down button, both of which are electrically connected with the controller and transmit control signals to the controller;

[0012] The controller controls the second motor to drive the lifting mechanism to fast lift up to a first predetermined position according to the signal transmitted by the fast lifting-up button, and controls the second motor to drive the lifting mechanism to fast lift down to a second predetermined position according to the signal transmitted by the fast lifting-down button.

[0013] Further, the slow lifting control component comprises a slow lifting-up button and a slow lifting-down button, both of which are electrically connected with the controller and transmit control signals to the controller;

[0014] The controller controls the second motor to drive the lifting mechanism to slow lift up to a third predetermined position according to the signal transmitted by the slow lifting-up button, and controls the second motor to drive the lifting mechanism to slow lift down to a fourth predetermined position according to the signal transmitted by the slow lifting-down button.

[0015] Further, the lifting control system of the grinding head further comprises an electromagnetic brake electrically connected with the controller, so as to control the second motor to stop running at a predetermined time through the controller.

[0016] In another aspect, the application also provides a grinding and polishing machine comprising the lifting control system of the grinding head.

[0017] In another aspect, the application also provides a lifting control method of a grinding head, which is executed by the lifting control system of the grinding head, and comprises:

[0018] Step S1: setting the rotation speed N of the second motor, the rotation speed preset ratio 1 / n, the operation frequency F of the second motor and the operation time T of the second motor in the controller, obtaining the ramp function image by the ramp function F=AT to obtain the time Tmax for the second motor to rotate from 0 to N, wherein n satisfies the relationship: n≥1 and n is an integer;

[0019] Step S2: starting the fast lifting and lowering control component, and the controller controls the second motor to drive the lifting and lowering mechanism to fast ascend or fast descend at the rotation speed of 1 / n of N according to the signal transmitted by the fast lifting and lowering control component until the grinding disc reaches the second predetermined position, and then the fast lifting and lowering control component is turned off.

[0020] Step S3: according to the processing requirement, the controller controls the first motor to drive the grinding disc to rotate, and the slow lifting and lowering control component is started, the controller controls the second motor to drive the lifting and lowering mechanism to slow ascend to the third predetermined position or slow descend to the fourth predetermined position at the rotation speed of 1 / n of N according to the signal transmitted by the slow lifting and lowering control component to polish the object to be processed, and the value of the ammeter is observed at the same time until the value of the ammeter meets the predetermined range, and then the slow lifting and lowering control component is turned off to complete the polishing of the object to be processed.

[0021] Further, in step S2, when the polishing of the object to be processed needs to be performed, the fast descending button is started, the controller controls the second motor to drive the lifting and lowering mechanism to fast descend at the rotation speed of 1 / n of N and descend to the second predetermined position, when the lifting and lowering mechanism descends beyond the second predetermined position, the fast ascending button is started, and the controller controls the second motor to drive the lifting and lowering mechanism to fast ascend at the rotation speed of 1 / n of N and ascend to the second predetermined position, wherein n satisfies the relationship n=1.

[0022] Further, in step S3, when the slow micro-adjustment needs to be performed, the slow descending button or the slow ascending button is started in the way of intermittent pressing, and the controller controls the second motor to operate at the rotation speed of 1 / n of N to drive the lifting and lowering mechanism to ascend at least once or descend at least once, wherein the time AT of intermittent pressing the slow descending button or the slow ascending button satisfies the relationship 0≤△T≤Tmax, and n satisfies the relationship 1

[0023] Further, in step S3, when the slow adjustment needs to be performed, the slow descending button or the slow ascending button is started in the way of continuous pressing, and the controller controls the second motor to operate at the rotation speed of 1 / n of N to drive the lifting and lowering mechanism to ascend at least once or descend at least once, wherein the time AT of continuous pressing the slow descending button or the slow ascending button satisfies the relationship △T>Tmax, and n satisfies the relationship 1

[0024] In the application, when the lifting control system is actually used, the fast lifting control component can be triggered first to transmit a trigger signal to the controller, so that the controller controls the second motor to drive the lifting mechanism to fast ascend or fast descend, and then drives the grinding head to reach the predetermined position. At this time, the fast lifting control component needs to be disconnected, and the slow lifting control component is triggered to transmit a trigger signal to the controller, so that the controller controls the second motor to drive the lifting mechanism to slow ascend or slow descend. In this process, the controller controls the first motor to drive the grinding disc to rotate to grind the workpiece. At the same time, during the grinding process, the slow lifting control component needs to be controlled while observing the current meter with the naked eye. Compared with the prior art that uses a hand-operated mechanism to slightly adjust the lifting of the grinding disc to grind the workpiece, the slow lifting control component added in the application can replace the hand-operated mechanism to slightly adjust the grinding disc, which not only reduces the labor cost, but also improves the work efficiency and the processing precision to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The illustrative embodiments of the application and their descriptions are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0026] Figure 1 The front view of the partial structure of the lifting control system of the grinding head disclosed in the embodiment of the application;

[0027] Figure 2 The top view of the partial structure of the lifting control system of the grinding head disclosed in the embodiment of the application;

[0028] Figure 3 The structure schematic diagram of the lifting control system of the grinding head disclosed in the embodiment of the application;

[0029] Figure 4 The principle diagram of the lifting control system of the grinding head disclosed in the embodiment of the application;

[0030] Figure 5 The flowchart of the lifting control method of the grinding head disclosed in the embodiment of the application.

[0031] Among the above drawings, the following reference signs are included:

[0032] 10, grinding assembly; 11, first motor; 12, second motor; 13, lifting mechanism; 14, grinding disc; 20, transmission screw; 30, transmission shaft; 40, gearbox transmission mechanism; 50, electromagnetic brake. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth in the examples are not meant to limit the scope of the present application. It should also be understood that the size of the various parts shown in the figures can not be to scale for ease of illustration. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the disclosure, if appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely an example, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters in the following drawings represent similar items, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0036] As mentioned in the background, in the machining process, the existing polishing machine controls the rapid lifting and lowering of the polishing disc (or polishing disc) through the lifting button and the lowering button on the operation panel, and when the polishing disc (or polishing disc) is about to contact the glass surface, a hand crank mechanism is used to slightly adjust the lifting and lowering of the polishing disc (or polishing disc) to polish the workpiece to be processed, while observing the ammeter for monitoring the current of the grinding head motor. However, the manual control of the hand crank mechanism is laborious, and since the ammeter and the hand crank mechanism are not in the same place, the adjustment and observation are not convenient and the efficiency is low. Therefore, in order to solve the problems of high labor cost and low efficiency, the inventors of the present application have designed a new type of lifting control system for a grinding head, which will be described in detail below.

[0037] Referring to Figures 1 to 5 As shown in the drawings, the present application provides a lifting control system for a grinding head, hereinafter referred to as the lifting control system, which comprises a grinding assembly 10, a control assembly and an ammeter.

[0038] The grinding assembly 10 comprises a first motor 11, a second motor 12, a lifting mechanism 13 and a grinding disc 14. The grinding disc 14 is installed at the bottom of the lifting mechanism 13. The first motor 11 is installed on the lifting mechanism 13 to drive the grinding disc 14 to rotate. The second motor 12 is drivingly connected with the lifting mechanism 13 to drive the lifting mechanism 13 to lift or lower. The control assembly comprises a controller, a quick lifting control component and a slow lifting control component. The quick lifting control component, the slow lifting control component, the first motor 11 and the second motor 12 are electrically connected with the controller. An ammeter is arranged on the second motor 12 to detect the current of the second motor 12. The controller is used to control the first motor 11 and the second motor 12 according to the signals transmitted by the quick lifting control component and the slow lifting control component.

[0039] In the embodiment, the control assembly comprises a controller, a quick lifting control component and a slow lifting control component. In actual processing of the lifting control system, the grinding disc 14 is installed at the bottom of the lifting mechanism 13. The first motor 11 is installed on the lifting mechanism 13. In this way, the first motor 11 drives the grinding disc 14 to rotate. The second motor 12 is drivingly connected with the lifting mechanism 13 to drive the lifting mechanism 13 to lift or lower. The quick lifting control component, the slow lifting control component, the first motor 11 and the second motor 12 are electrically connected with the controller. At this time, the controller can control the operation of the first motor 11 and the second motor 12 according to the signals transmitted by the quick lifting control component and the slow lifting control component. At the same time, the ammeter is arranged on the second motor 12 to detect the current of the second motor 12. Since the processing allowance is determined by how much the grinding disc 14 travels downward, when the controller controls the second motor 12 to drive the lifting mechanism 13 to slowly lift or slowly lower according to the signal transmitted by the slow lifting control component, the slow lifting or slow lowering of the grinding disc 14 is controlled, and the object to be processed is polished, the reading of the ammeter can reflect the size of the processing allowance. Therefore, the automatic control of the polishing of the object to be processed can be realized by using the slow lifting control component and the ammeter. The labor cost is reduced to a certain extent, the work efficiency is improved, and the processing precision is improved.

[0040] That is to say, when the lifting control system is actually used, the rapid lifting control component can be triggered first to transmit a trigger signal to the controller, so that the controller controls the second motor 12 to drive the lifting mechanism 13 to rapidly ascend or rapidly descend, thereby driving the grinding head to reach the predetermined position. At this time, the rapid lifting control component needs to be disconnected, and the slow lifting control component is triggered to transmit a trigger signal to the controller, so that the controller controls the second motor 12 to drive the lifting mechanism 13 to slowly ascend or slowly descend. In this process, the controller controls the first motor 11 to drive the grinding disc 14 to rotate to polish the workpiece. At the same time, during the grinding process, the slow lifting control component needs to be controlled while the current meter reading is observed with the naked eye. Compared with the prior art that uses a hand-operated mechanism to slightly adjust the lifting of the grinding disc 14 to polish the workpiece, the slow lifting control component added in the embodiment can replace the hand-operated mechanism to slightly adjust the grinding disc 14, which not only reduces the labor cost, but also improves the work efficiency and the processing precision to a certain extent.

[0041] Further, referring to Figure 4 The rapid lifting control component in the embodiment includes a rapid ascending button and a rapid descending button, both of which are electrically connected to the controller and transmit control signals to the controller. The controller controls the second motor 12 to drive the lifting mechanism 13 to rapidly ascend to the first predetermined position according to the signal transmitted by the rapid ascending button, and controls the second motor 12 to drive the lifting mechanism 13 to rapidly descend to the second predetermined position according to the signal transmitted by the rapid descending button. In the embodiment, the rapid descending button is triggered in a continuous pressing manner first, and the controller controls the second motor 12 to drive the lifting mechanism 13 to rapidly descend according to the trigger signal. When the lifting mechanism 13 has descended beyond the second predetermined position, the rapid descending button needs to be disconnected and the rapid ascending button is triggered, so that the controller controls the second motor 12 to drive the lifting mechanism 13 to ascend to the second predetermined position. In this way, the grinding disc 14 can be close to the workpiece, which is conducive to the subsequent process. It can be seen that the existence of the rapid ascending button and the rapid descending button can make the grinding disc 14 rapidly run to the required position, thereby saving the working time and improving the work efficiency.

[0042] It should be noted that the first predetermined position is the initial position of the grinding disc 14, that is, the initial position of the lifting mechanism 13 before the processing starts and the lifting mechanism 13 has not descended. The second predetermined position is the position at which the grinding disc 14 is about to contact the surface of the workpiece, that is, the distance between the grinding disc 14 and the workpiece is within a preset range. The preset range is not specifically limited in the application and can be set according to the shape and structure of the workpiece or determined according to the empirical value. The preset range is not described in detail in the application.

[0043] Further, referring to Figure 4 The slow lifting control component in the embodiment includes a slow lifting button and a slow lowering button, both of which are electrically connected with the controller and transmit control signals to the controller. The controller controls the second motor 12 to drive the lifting mechanism 13 to slowly lift and reach a third predetermined position according to the signal transmitted by the slow lifting button. The controller controls the second motor 12 to drive the lifting mechanism 13 to slowly lower and reach a fourth predetermined position according to the signal transmitted by the slow lowering button. When the grinding disc 14 approaches the workpiece, the slow lowering button is triggered to make the controller control the second motor 12 to drive the lifting mechanism 13 to slowly lower, and at the same time, the first motor 11 drives the grinding disc 14 to rotate, thereby polishing the surface of the workpiece. In addition, the slow lifting button and the slow lowering button can be triggered alternately according to the processing requirements, so that the controller controls the second motor 12 to drive the lifting mechanism 13 to slowly lift or slowly lower, and in cooperation with the rotation of the grinding disc 14, the outer surface of the workpiece is polished in a reciprocating manner. The slow lifting button and the slow lowering button are used to replace the manual mechanism in the embodiment, that is, the machine control is used to replace the manual control, the micro-adjustment of lifting is realized, the workpiece can be polished more precisely, and the processing precision of the workpiece is improved to a certain extent. It should be noted that the third predetermined position and the fourth predetermined position are the processing allowance positions of the workpiece, which need to be set according to the processing requirements, and the processing requirements are not described in the application.

[0044] Further, referring to Figure 1 and Figure 4 The lifting control system of the grinding head in the embodiment further includes an electromagnetic brake 50, which is electrically connected with the controller to control the second motor 12 to stop running at a predetermined time through the controller. In this way, when the circuit of the lifting control system suddenly fails and causes power failure, the electromagnetic brake 50 will make the second motor 12 quickly brake and stop, thereby locking the position of the lifting mechanism 13 and making the lifting mechanism 13 quickly stop running, effectively preventing the lifting mechanism 13 from being damaged due to power failure during running, and the existence of the electromagnetic brake 50 plays a good safety guarantee role for the lifting control system.

[0045] On the other hand, the application also provides a grinding and polishing machine, which includes the lifting control system of the grinding head described above, so the grinding and polishing machine includes all the technical effects of the lifting control system of the grinding head described above. Since the technical effects of the lifting control system of the grinding head have been described in detail in the foregoing, they will not be described here.

[0046] In another aspect, the embodiment of the present application also provides a polishing head lifting control method, which is executed by using the polishing head lifting control system described above, and thus, the polishing head lifting control method comprises all the technical effects of the polishing head lifting control system. Since the technical effects of the polishing head lifting control system have been described in detail above, no further description is given here.

[0047] Further, referring to Figure 5 The polishing head lifting control method in the embodiment comprises the following steps:

[0048] Step S1: Set the rotating speed N of the second motor 12, the rotating speed preset ratio 1 / n, the operating frequency F of the second motor 12 and the operating time T of the second motor 12 in the controller, obtain the ramp function image by using the ramp function F=AT, so as to obtain the time Tmax of the second motor 12 from 0 to N, wherein n satisfies the relationship: n≥1 and n is an integer, for example, n=1 or n=2 or n=3 or n=4 or n=5 or n=6 or n=7 or n=8 or n=9 or n=10, etc.

[0049] Step S2: Start the fast lifting control component, and the controller controls the second motor 12 to drive the lifting mechanism 13 to fast ascend or fast descend at the rotating speed of 1 / n of N according to the signal transmitted by the fast lifting control component, until the polishing disc 14 reaches the second predetermined position, and then stop the fast lifting control component.

[0050] Step S3: According to the processing requirement, use the controller to control the first motor 11 to drive the polishing disc 14 to rotate, and start the slow lifting control component, and the controller controls the second motor 12 to drive the lifting mechanism 13 to slowly ascend to the third predetermined position or slowly descend to the fourth predetermined position at the rotating speed of 1 / n of N according to the signal transmitted by the slow lifting control component, so as to polish the object to be processed, and at the same time, observe the value of the ammeter, until the value of the ammeter meets the predetermined range, and then stop the slow lifting control component, so as to complete the polishing of the object to be processed.

[0051] In the present application, the rotating speed N (r / s) of the second motor 12, the operating frequency F (Hz) of the second motor 12 and the operating time T (s) of the second motor 12 in step S1 can be set according to the processing requirement, which is not limited in the present application.

[0052] Specifically, the controller in the embodiment is a programmable logic controller (PLC).

[0053] Specifically, in step S2, when polishing of the workpiece needs to be performed, the fast drop button is pressed, and the controller controls the second motor 12 to drive the lifting mechanism 13 to fast drop at a speed of 1 / n of N and drop to the second predetermined position. When the lifting mechanism 13 drops beyond the second predetermined position, the fast rise button is pressed, and the controller controls the second motor 12 to drive the lifting mechanism 13 to fast rise at a speed of 1 / n of N and rise to the second predetermined position, where n satisfies the relationship n = 1.

[0054] Specifically, in step S3, when slow micro-adjustment needs to be performed, the slow drop button or the slow rise button is pressed in a jog mode, and the controller controls the second motor 12 to drive the lifting mechanism 13 to rise at least once or drop at least once at a speed of 1 / n of N, where the time ΔT of pressing the slow drop button or the slow rise button in the jog mode satisfies the relationship 0 ≤ ΔT ≤ Tmax, and n satisfies the relationship 1 < n < 11, for example, n = 2 or n = 3 or n = 4 or n = 5 or n = 6 or n = 7 or n = 8 or n = 9 or n = 10. When n < 1, for example, n = 0.5, 1 / n = 2, the controller controls the second motor 12 to operate at a speed of 2N. At this time, the speed of the second motor 12 has exceeded the set speed N, and finally slow micro-adjustment cannot be performed. When n ≥ 11, for example, n = 11, 1 / n = 1 / 11, the controller controls the second motor 12 to operate at a speed of 1 / 11 of N. At this time, the speed has been lower than the minimum speed set for the motor, and long-term use can cause irreversible damage to the motor.

[0055] Specifically, in step S3, when slow micro-adjustment needs to be performed, the slow drop button or the slow rise button is pressed in a jog mode, and the controller controls the second motor 12 to drive the lifting mechanism 13 to rise at least once or drop at least once at a speed of 1 / n of N, where the time ΔT of pressing the slow drop button or the slow rise button in the jog mode satisfies the relationship 0 ≤ ΔT ≤ Tmax, and n satisfies the relationship 1 < n < 11, for example, n = 2 or n = 3 or n = 4 or n = 5 or n = 6 or n = 7 or n = 8 or n = 9 or n = 10. When n < 1, for example, n = 0.5, 1 / n = 2, the controller controls the second motor 12 to operate at a speed of 2N. At this time, the speed of the second motor 12 has exceeded the set speed N, and finally slow micro-adjustment cannot be performed. When n ≥ 11, for example, n = 11, 1 / n = 1 / 11, the controller controls the second motor 12 to operate at a speed of 1 / 11 of N. At this time, the speed has been lower than the minimum speed set for the motor, and long-term use can cause irreversible damage to the motor.

[0056] It is worth noting that, referring to Figure 4As shown, the ramp function includes a sloping segment inclined to the horizontal coordinate and a parallel segment parallel to the horizontal coordinate, when the slow descending button or the slow ascending button is opened in the way of point pressing, the time ΔT of point pressing is located in the sloping segment; when the slow descending button or the slow ascending button is opened in the way of continuous pressing, the time ΔT of continuous pressing is located in the straight segment.

[0057] Referring to Figure 4 Figure 4 As shown, the lifting control system of the polishing head of the present application has the following control principle:

[0058] (1) input trigger signal, the holding time ΔT of the signal is set by artificial;

[0059] (2) according to the source of the trigger signal, set different speed preset ratio 1 / n in the controller;

[0060] (3) start the ramp function F=AT in the controller, set the value of F and T to get the image of the ramp function, and get the time of the second motor 12 from 0 speed to N speed;

[0061] (4) according to the source of the trigger signal, set the forward and reverse state of the lifting mechanism;

[0062] (5) when executing slow micro-adjustment, n in the speed preset ratio 1 / n satisfies the relationship: 1

[0063] It should be noted that the trigger signal is the signal when the fast descending button is opened, the fast ascending button is opened, the slow descending button is opened, and the slow ascending button is opened; the holding time ΔT of the signal is the time between the opening and closing of the above-mentioned buttons; the forward rotation is the opening of the fast ascending button and the slow ascending button, and the reverse rotation is the opening of the fast descending button and the slow descending button; n is the empirical value summarized by the inventor of the present application according to the actual process, which can be n=2 or n=3 or n=4 or n=5 or n=6 or n=7 or n=8 or n=9 or n=10.

[0064] The operation steps of the present application will be described in detail below according to specific embodiments.

[0065] Firstly, the following instruction is set in the controller: when the fast up button or the fast down button is opened, the n value of the rotation speed preset ratio 1 / n in the controller is set as 1; when the slow up button or the slow down button is opened, the n value of the rotation speed preset ratio 1 / n in the controller satisfies the relationship: 1 < n < 11, and n is an integer; the rotation speed N, the running frequency F and the running time T of the second motor 12 are set, at this time, the time Tmax of the second motor 12 from 0 rotation speed to N can be obtained through the ramp function F = AT.

[0066] Secondly, the fast down button is pressed and held, the lifting mechanism 13 is lowered, and when the grinding disc 14 is about to approach the surface of the workpiece to be processed, the fast down button is released, and the lifting mechanism 13 stops descending;

[0067] Then, the slow down button is pressed and held, and the current meter reading is observed, when the current meter reading approaches the required value range, the slow down button is released, and the lifting mechanism 13 stops descending, at this time, the current meter value is basically stable around the preset value. In this process, when slow micro-adjustment needs to be performed, the slow down button or the slow up button is opened in the way of intermittent pressing, and when slow adjustment needs to be performed, the slow down button or the slow up button is opened in the way of continuous pressing, and the button can be pressed multiple times according to the processing requirements until the processing of the workpiece to be processed meets the processing requirements.

[0068] From the above description, it can be seen that the above-mentioned embodiments of the application achieve the following technical effects: compared with the micro-lift adjustment mode of the hand crank mechanism in the prior art, the slow up button and the slow down button are used to replace the hand crank mechanism, and the micro-adjustment of the lifting mechanism can be realized according to the current meter reading during processing, which effectively improves the processing precision.

[0069] For the sake of description, spatial relative terms such as "above", "upper", "on", "top", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Therefore, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0070] In addition, it should be noted that the use of "first", "second", and the like words to qualify elements is merely intended to distinguish the respective elements from one another, and does not have a special meaning unless otherwise stated. Therefore, these words should not be interpreted as limiting the scope of protection of the present application.

[0071] The preferred embodiments of the present application have been described above with the help of drawing. However, for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A lift control system for a polishing head, the system comprising: The application relates to a grinding head lifting control system and a grinding head lifting control method. The grinding head lifting control system comprises a grinding assembly (10), a control assembly, an ammeter and an electromagnetic brake (50). The grinding assembly (10) comprises a first motor (11), a second motor (12), a lifting mechanism (13) and a grinding disc (14), the grinding disc (14) is installed at the bottom of the lifting mechanism (13), the first motor (11) is installed on the lifting mechanism (13) to drive the grinding disc (14) to rotate, and the second motor (12) is in driving connection with the lifting mechanism (13) to drive the lifting mechanism (13) to lift. The control assembly comprises a controller, a quick lifting control component and a slow lifting control component, the quick lifting control component, the slow lifting control component, the first motor (11) and the second motor (12) are electrically connected with the controller. The ammeter is arranged on the second motor (12) to detect the current of the second motor (12). The controller is used for controlling the first motor (11) and the second motor (12) according to signals transmitted by the quick lifting control component and the slow lifting control component. The quick lifting control component comprises a quick lifting-up button and a quick lifting-down button, the quick lifting-up button and the quick lifting-down button are electrically connected with the controller and transmit control signals to the controller. The controller controls the second motor (12) to drive the lifting mechanism (13) to quickly lift up and lift to a first predetermined position according to the signal transmitted by the quick lifting-up button, and the controller controls the second motor (12) to drive the lifting mechanism (13) to quickly lift down and lift to a second predetermined position according to the signal transmitted by the quick lifting-down button. The slow lifting control component comprises a slow lifting-up button and a slow lifting-down button, the slow lifting-up button and the slow lifting-down button are electrically connected with the controller and transmit control signals to the controller.

2. The lift control system of the polishing head according to claim 1, wherein, The controller controls the second motor (12) to drive the lifting mechanism (13) to slowly lift up and lift to a third predetermined position according to the signal transmitted by the slow lifting-up button, and the controller controls the second motor (12) to drive the lifting mechanism (13) to slowly lift down and lift to a fourth predetermined position according to the signal transmitted by the slow lifting-down button.

3. A lapping machine characterized by, The grinding head lifting control system further comprises an electromagnetic brake (50) which is electrically connected with the controller to control the second motor (12) to stop running at a predetermined time through the controller.

4. A method of lift control of a polishing head, characterized by, The grinding and polishing machine comprises the grinding head lifting control system according to any one of claims 1 to 2. The grinding head lifting control method is executed by the grinding head lifting control system according to any one of claims 1 to 2, and the grinding head lifting control method comprises the following steps: Step S1: setting the rotation speed N of the second motor (12), the rotation speed preset ratio 1 / n, the operation frequency F of the second motor (12) and the operation time T of the second motor (12) in the controller, obtaining the slope function image by the slope function F=AT to obtain the time Tmax of the second motor (12) from 0 to N, wherein n satisfies the relationship: n≥1 and n is an integer; Step S2: starting the fast lifting control component, and the controller controls the second motor (12) to drive the lifting mechanism (13) to fast ascend or fast descend at the speed of 1 / n of N according to the signal transmitted by the fast lifting control component until the grinding disc (14) reaches the second predetermined position, and then the fast lifting control component is closed; Step S3: according to the processing requirement, the controller controls the first motor (11) to drive the grinding disc (14) to rotate, and the slow lifting control component is started, the controller controls the second motor (12) to drive the lifting mechanism (13) to slowly ascend to the third predetermined position or slowly descend to the fourth predetermined position at the speed of 1 / n of N according to the signal transmitted by the slow lifting control component to polish the object to be processed, and the value of the ammeter is observed at the same time until the value of the ammeter meets the predetermined range, and then the slow lifting control component is closed to complete the polishing of the object to be processed.

5. The polishing head lifting control method according to claim 4, wherein In step S2, when the polishing of the object to be processed needs to be performed, the fast descending button is started, the controller controls the second motor (12) to drive the lifting mechanism (13) to fast descend at the speed of 1 / n of N and descend to the second predetermined position, when the lifting mechanism (13) descends beyond the second predetermined position, the fast ascending button is started, and the controller controls the second motor (12) to drive the lifting mechanism (13) to fast ascend at the speed of 1 / n of N and ascend to the second predetermined position, wherein n satisfies the relationship n=1.

6. The polishing head lifting control method according to claim 4, wherein In step S3, when the slow micro-adjustment needs to be performed, the slow descending button or the slow ascending button is started in the way of intermittent pressing, and the controller controls the second motor (12) to operate at the speed of 1 / n of N to drive the lifting mechanism (13) to ascend or descend at least once, wherein the time ΔT of intermittent pressing the slow descending button or the slow ascending button satisfies the relationship 0≤△T≤Tmax, and n satisfies the relationship 1 7. The method of claim 6, wherein In step S3, when the slow adjustment needs to be performed, the slow descending button or the slow ascending button is started in the way of continuous pressing, and the controller controls the second motor (12) to operate at the speed of 1 / n of N to drive the lifting mechanism (13) to ascend or descend at least once, wherein the time ΔT of continuous pressing the slow descending button or the slow ascending button satisfies the relationship △T>Tmax, and n satisfies the relationship 1

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