A control method of an instrument pressure maintaining device

Abstract

The application discloses a control method of an instrument pressure maintaining device. The control method comprises the following steps: controlling the application of rated voltage to an electric push rod to drive the upper die to move downward at a rated speed when the initial pressing is performed; monitoring the state of a variable speed position detection sensor during the driving of the upper die to move downward at the rated speed by the electric push rod; if the state of the variable speed position detection sensor changes, triggering the generation of a control voltage signal on the basis of the rated voltage; the control voltage signal makes the pressing speed of the electric push rod decrease until the state of the bottom limit sensor changes. The application controls the movement of the upper die by the electric push rod, and increases a variable speed position detection sensor on the electric push rod. When the slider in the electric push rod moves to the variable speed position detection sensor, the generation of the control voltage signal on the basis of the rated voltage is triggered, so that the pressing speed of the upper die gradually decreases, the glass is prevented from being hit at a large speed, and the success rate and efficiency of pressure maintaining are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of control methods of instrument pressure maintaining devices, and particularly relates to a control method of an instrument pressure maintaining device. BACKGROUND

[0002] The glass and the lower shell of the instrument are pasted together by a foam rubber frame. The foam rubber frame has adhesion on both sides, similar to double-sided tape. When pasting, the foam rubber frame is first adhered to the lower shell, and then the glass is pasted on the foam rubber frame. Finally, manual pressure is applied to the glass. Otherwise, the glass may not be firmly adhered, leading to water entering the instrument, or even falling off. Traditionally, the thumb is pressed along the outer edge of the glass. This method has the following disadvantages: 1. Manual pressing can only press a small local area at each moment, not the entire annular surface of the foam rubber frame. The pressing speed and force are uneven, resulting in uneven deformation of the annular surface of the foam rubber frame, which may cause some local areas of the outer glass to not be well adhered, leading to water entering the product; 2. Manual pressing for a long time can cause the operator's thumb to be sore and tired; 3. Manual pressing requires high operating skills of the workers, and the operators must be strictly trained before they can work.

[0003] Patent application No. 2022225916426 provides an instrument pressure maintaining device. The upper die is moved by a pneumatic cylinder. The pressing speed of the pneumatic cylinder is difficult to adjust flexibly within one pressing stroke. Only by setting a slow pressing speed of the pneumatic cylinder throughout the stroke can the upper die avoid hitting the glass at a fast speed. If the pressing speed is slow throughout the stroke, the efficiency of the pressure maintaining device will be affected. SUMMARY

[0004] The present application aims to solve the problems existing in the prior art and provides a control method of an instrument pressure maintaining device.

[0005] To achieve the above-mentioned purpose, the present application provides a control method of an instrument pressure maintaining device. The instrument pressure maintaining device comprises a bottom plate, two sides of the bottom plate are fixedly connected with support plates, the upper side of each support plate is fixedly connected with a top plate, the upper side of the bottom plate is slidably connected with a base, the upper side of the base is fixedly connected with a lower die, the upper side of the lower die is provided with an instrument placing groove, the top plate and the bottom plate are fixedly connected with a mounting plate, the rear side of the mounting plate is fixedly connected with a pushing component, the front end of the pushing component is fixedly connected with the base through the mounting plate, the upper part of the top plate is provided with an electric push rod, the lower end of the electric push rod is fixedly connected with an upper die through the top plate, the lower side of the upper die is provided with a pressing rib for pressing the glass around the instrument, the upper and lower ends of the electric push rod are respectively provided with a top limit sensor and a bottom limit sensor, the upper side of the bottom limit sensor is provided with a variable speed position detection sensor at intervals, and the control method comprises the following steps:

[0006] In the state that the pushing component is pushed out, the instrument pasted on the foam frame on the lower shell is put into the instrument placing groove;

[0007] The pushing component is controlled to be retracted, and the base is moved inward to a predetermined position;

[0008] The rated voltage is applied to the electric push rod to drive the upper die to move downward at a rated speed;

[0009] During the period that the electric push rod drives the upper die to move downward at the rated speed, the state of the variable speed position detection sensor is monitored, if the state of the variable speed position detection sensor changes, a control voltage signal is generated on the basis of the rated voltage, the control voltage signal makes the downward pressing speed of the electric push rod decrease until the state of the bottom limit sensor changes.

[0010] Further, the control voltage signal generated on the basis of the rated voltage is generated in the following manner:

[0011]

[0012] Wherein, In order to generate the control voltage signal on the basis of the rated voltage, A is the rated voltage value, t is the time of the control voltage signal, and c is the performance adjustment coefficient.

[0013] Further, the value of c is 10 to 20.

[0014] Beneficial effects: the present application controls the movement of the upper die by the electric push rod, and increases a variable speed position detection sensor on the electric push rod, when the slider in the electric push rod moves to the variable speed position detection sensor, a control voltage signal is generated on the basis of the rated voltage, the downward pressing speed of the upper die is gradually reduced, the glass is avoided from being impacted at a large speed, and the success rate and efficiency of pressure maintaining are improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the pushing component after the base is pushed out;

[0016] Figure 2 is a structural schematic view of the pushing component in the retracted state;

[0017] Figure 3 is a rear side structural schematic view of the instrument pressure maintaining device;

[0018] Figure 4 is a cooperation structural schematic view of the upper die and the lower die and the instrument;

[0019] Figure 5 is Figure 4 is a partial enlarged structural schematic view of the A area in the figure. DETAILED DESCRIPTION

[0020] The present application will be further clarified by the following examples, which are intended to be purely exemplary of the application.

[0021] As Figure 1 shown, the embodiment of the present application provides a control method of an instrument pressure maintaining device, wherein the instrument pressure maintaining device comprises a bottom plate 1, both sides of the bottom plate 1 are fixedly connected with support plates 2, the upper side of the support plates 2 is fixedly connected with a top plate 3, the upper side of the bottom plate 1 is slidably connected with a base 4, the upper side of the base 4 is fixedly connected with a lower mold 5, the upper side of the lower mold 5 is provided with an instrument placing groove 51, the shape and size of the instrument placing groove 51 are matched with the lower shell 102 of an instrument 10, the top plate 3 and the bottom plate 1 are fixedly connected with a mounting plate 6, the rear side of the mounting plate 6 is fixedly connected with a pushing component 7, the front end of the pushing component 7 is fixedly connected with the base 4 through the mounting plate 6, the upper part of the top plate 3 is provided with an electric push rod 8, the lower end of the electric push rod 8 is fixedly connected with an upper mold 9 through the top plate 3, the lower side of the upper mold 9 is provided with a pressing rib 11 for pressing the periphery of a glass 101 of the instrument 10, the shape and size of the pressing rib 11 are matched with the glass 101 of the instrument 10, and the periphery of the glass 101 can be pressed when the electric push rod 8 is pushed out to the lowermost end. The main structure of the electric push rod 8 is a prior art, which comprises a shell, a driving motor mounted on the upper end of the shell, a threaded rod in transmission connection with the driving motor, and a sleeve rod spacedly arranged outside the threaded rod, etc., the rear end of the sleeve rod is fixedly connected with a sliding block, the middle part of the sliding block is in threaded connection with the threaded rod, and the periphery of the sliding block is slidably connected with guide rods which are spacedly arranged outside the sleeve rod, and when the driving motor rotates, the sliding block can drive the rod body to stretch and retract. The top limit sensor and the bottom limit sensor are respectively arranged at the upper end and the lower end of the electric push rod 8, and different from the prior art, a variable speed position detection sensor is spacedly arranged above the bottom limit sensor, and the distance between the variable speed position detection sensor and the bottom limit sensor can be set according to actual needs. The top limit sensor, the bottom limit sensor and the variable speed position detection sensor are generally micro switches, and when the sliding block moves to one side, the micro switches are triggered to change the state. In addition, in order to facilitate the stable pushing of the upper mold 9 and the base 4 to move, a first guide sleeve 12 and a second guide sleeve 13 can be respectively arranged on the top plate 3 and the mounting plate 6, and a first guide rod 14 and a second guide rod 15 are fixedly arranged at the corresponding positions of the upper side of the upper mold 9 and the rear side of the base 4, and the first guide rod and the second guide rod 15 are slidably connected in the first guide sleeve 12 and the second guide sleeve 13 respectively.

[0022] The control method of the device comprises:

[0023] Referring to Figure 1In the state that the pushing part 7 is pushed out, the instrument 10 with the glass 101 pasted on the foam rubber frame 103 of the lower shell 102 is put into the instrument placing groove 51.

[0024] The pushing part 7 is controlled to be retracted, and the base 4 is moved inward to a predetermined position. See Figure 2 After the base 4 is moved to the predetermined position, the lower mold 5 is arranged opposite to the upper mold 9.

[0025] The rated voltage is controlled to be applied to the electric push rod 8, so as to drive the upper mold 9 to move downward at a rated speed. The rated voltage is relative to the electric push rod 8. For example, if the rated voltage of the electric push rod 8 is DC 24V, the DC 24V is directly supplied to the electric push rod 8 for use. When the driving motor of the electric push rod 8 reaches the maximum speed, the upper mold 9 can be driven to move downward at the rated speed.

[0026] During the driving of the electric push rod 8 to move the upper mold 9 downward at the rated speed, the state of the variable speed position detection sensor is monitored. If the state of the variable speed position detection sensor changes, a control voltage signal is generated on the basis of the rated voltage, which makes the downward pressing speed of the electric push rod 8 decrease until the state of the bottom limit sensor changes.

[0027] The above-mentioned manner of generating the control voltage signal on the basis of the rated voltage is as follows:

[0028]

[0029] Among them, In order to generate the control voltage signal on the basis of the rated voltage, A is the rated voltage value, t is the time of the control voltage signal, and c is the performance adjustment coefficient, which is preferably 10 to 20. It can be seen that when the state of the variable speed position detection sensor changes, that is, t=0, the voltage value of the control voltage signal is the rated voltage value A, and with the passage of time, gradually decreases, and the corresponding downward pressing speed of the electric push rod 8 gradually decreases, so as to prevent the upper mold 9 from impacting the glass 101 at a faster speed.

[0030] The above-mentioned is only the preferred embodiment of the present application. It should be noted that other parts not specifically described belong to the prior art or common knowledge for ordinary skilled in the art. Without departing from the principle of the present application, a number of improvements and refinements can be made, which should be regarded as the protection scope of the present application.

Claims

1. A control method of an instrument pressure maintaining device, characterized by, The instrument pressure maintaining device comprises a bottom plate, support plates fixedly connected to both sides of the bottom plate, a top plate fixedly connected to the upper side of the support plate, a base slidingly connected to the upper side of the bottom plate, a lower mold fixedly connected to the upper side of the base, an instrument placing groove provided on the upper side of the lower mold, an installation plate fixedly connected between the top plate and the bottom plate, a pushing component fixedly connected to the rear side of the installation plate, the front end of the pushing component penetrating through the installation plate and being fixedly connected to the base, an electric push rod provided on the upper part of the top plate, the lower end of the electric push rod penetrating through the top plate and being fixedly connected to an upper mold, a pressing rib provided on the lower side of the upper mold for pressing the glass around the instrument, a top limit sensor and a bottom limit sensor respectively provided on the upper and lower ends of the electric push rod, a variable speed position detection sensor provided above the bottom limit sensor, and a control method comprising the following steps: placing the instrument with the glass pasted thereon into the instrument placing groove in the pushing component pushing state; controlling the pushing component to retract so that the base moves inwardly to a predetermined position; applying a rated voltage to the electric push rod to drive the upper mold to move downwardly at a rated speed; monitoring the state of the variable speed position detection sensor during the driving of the upper mold downwardly at the rated speed by the electric push rod, and triggering a control voltage signal generated on the basis of the rated voltage if the state of the variable speed position detection sensor changes, the control voltage signal causing the downward pressing speed of the electric push rod to decrease until the state of the bottom limit sensor changes and the downward pressing is stopped; the control voltage signal generated on the basis of the rated voltage is generated in the following manner: ； wherein, to generate the control voltage signal on the basis of the rated voltage, A is a rated voltage value, t is a time of the control voltage signal, and c is a performance adjustment coefficient.

2. The control method of the instrument pressure maintaining device according to claim 1, characterized by, the value of c is 10 to 20.

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