Electric control module of handheld electrode grinding device with adjustable grinding time

Abstract

The invention discloses an electric control module of a handheld pneumatic electrode grinding device. The electric control module is adjustable in grinding time. The module mainly comprises a module support, a power supply assembly, a timer and an electromagnetic valve. The power supply assembly and the timer are fixed on the module support. The power supply assembly comprises a commercial battery, a battery box and the timer. And the electromagnetic valve is fixed at a compressed gas input port of the handheld grinding device and is controlled by the timer. The electric control module is small in size, is tightly combined with the grinding device, is simple and convenient to operate, and ensures that the grinding precision of a traditional handheld grinding device is improved.

Description

Technical Field

[0001] The invention relates to equipment in the field of electrical control technology, in particular to an electrical control module of a handheld electrode dresser with adjustable grinding time. Background Art

[0002] During the resistance spot welding process, the harsh working conditions of fast pace, high temperature and high pressure make the copper electrode surface very easy to alloy and stick, thus affecting the welding quality. For this reason, in actual welding production, it is usually stipulated that a group of electrode caps need to be ground after a certain number of welding points to ensure the stability of the electrode cap end surface quality. However, during the spot welding process, due to the different welding process parameters and changes in welding conditions, the wear of the electrode cap is uncertain. Different grinding times are often required according to the different shapes, sizes and surface qualities of the electrode cap end surfaces after wear.

[0003] At present, domestic automobile companies generally use handheld electrode grinding equipment to grind the electrodes of manual welding guns. The grinding time is entirely controlled by workers based on their experience. Obviously, it is impossible to accurately control the grinding amount. On the one hand, it is difficult to ensure the grinding quality. On the other hand, it reduces the service life of the electrode cap and increases production costs.

[0004] Chinese patent document No. CN203599651U discloses a handheld electric electrode cap grinder, which includes a housing, a motor stator, a motor rotor, a grinding tool head, a rotating base, a tool head magazine and a tool head. However, the grinder does not consider the control of the electrode grinding time, and the grinding is completely controlled manually, and the grinding amount cannot be controlled.

[0005] Chinese patent document number CN202291670U discloses a pneumatic two-way grinding device, including a handle, a pneumatic ratchet wrench, a gear pair and a grinding tool. The device adjusts the electrode grinding time by manually controlling the on and off of the air intake of the pneumatic motor; this grinding method that relies on the worker's experience to judge the grinding time has a low grinding accuracy.

[0006] Therefore, in order to improve the quality and efficiency of handheld welding gun resistance spot welding electrode grinding on the welding line of the automobile factory, there is an urgent need for an electrical control module that can assist the traditional handheld electrode grinding equipment to adjust the grinding time. Summary of the invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides an electrical control module that can accurately adjust the grinding time. The present invention uses the automatic circuit disconnection function of the solid-state timer to achieve accurate adjustment of the grinding time of the traditional handheld electrode grinder. At the same time, the electrical control module uses a small, easy-to-carry and replaceable commercial battery as a power source, overcoming the shortcomings of the prior art that it cannot be used for handheld devices.

[0008] The technical solution adopted by the present invention is as follows:

[0009] The electrical control module is mainly composed of a module bracket, a power supply component, a timer and a solenoid valve, wherein the power supply component and the timer are fixed on the module bracket.

[0010] The power supply assembly comprises a battery, a battery box and a booster board, and the booster board is connected in parallel with the battery as a voltage output.

[0011] The timer adopts a power-off delay circuit. When the set delay time ends, the contact quickly switches from the normally open state to the normally closed state automatically, forming a complete return and waiting for the next delay start. The timer is provided with a timing switch for setting the delay time.

[0012] The solenoid valve is connected in series to the front end of the air inlet of the pneumatic grinder, receives the state signal of the timer and performs the corresponding on-off action. The solenoid valve is a normally closed solenoid valve, which is closed when the circuit is not connected; the air flow path is opened when the circuit is connected.

[0013] Compared with the prior art, the invention has the beneficial effect of realizing automatic control of the grinding time on the basis of the traditional handheld electrode dresser, greatly improving the service life of the electrode while ensuring the quality of electrode grinding. The entire electrical control module has a compact structure, maintaining the portability of the traditional handheld electrode dresser. At the same time, the electrical control module is easy to operate, and when in use, it only needs to control the timer switch and set the delay time of the timer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of an electrical control module;

[0015] Figure 2 It is the wiring diagram of the electrical control module;

[0016] In the figure: 1 hand-held electrode dresser, 2 timer, 3 battery box, 4 booster plate, 5 solenoid valve, 6 air inlet of hand-held electrode dresser, 7 module bracket, 8 battery. DETAILED DESCRIPTION

[0017] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0018] This embodiment includes: a module bracket 7, a power supply assembly, a timer 2 and a solenoid valve 5. The power supply assembly includes two commercial No. 5 dry batteries 8, a battery box 3 and a booster board 4. The two No. 5 dry batteries 8 are used as output power sources, and the booster board 4 is connected in parallel to obtain an output voltage of DC24V, which saves space and weight while providing rated voltage for the timer 2 and the solenoid valve 5.

[0019] Timer 2 uses a solid-state ultra-small timer with built-in dedicated IC timing control and modular power-off delay circuit. The selected timer includes a large and transparent time setting knob for easy time setting. The timer range is 1s and the accuracy is 0.01s, which meets the grinding needs of traditional handheld electrode grinders.

[0020] The solenoid valve 5 is a normally closed solenoid valve, which is connected to the compressed gas input port 6 of the grinder. The operator completes the time setting on the timer, the solenoid valve is powered on and opened, the gas circuit is connected, and the grinder enters the working state; after the delay time is up, the normally closed solenoid valve is powered off and the circuit is closed, and the grinding is completed.

[0021] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrical control module for a handheld pneumatic electrode dresser with adjustable grinding time, characterized in that: The module includes a module bracket, power supply assembly, timer and solenoid valve.

2. The module bracket according to claim 1, characterized in that: The module bracket is fixed to the air inlet of the grinder; the power supply component and the timer are fixed on the module bracket.

3. The power supply assembly according to claim 1, characterized in that: The device comprises a common battery, a battery box and a booster plate, wherein the booster plate is connected in parallel with the battery.

4. The timer according to claim 1, characterized in that: It includes a power-off delay circuit and is provided with a grinding time setting knob.

5. The solenoid valve according to claim 1, characterized in that: Connected in series with the air inlet of the pneumatic grinder.

6. The solenoid valve according to claim 1, characterized in that: The solenoid valve is normally closed. When the circuit is not connected, the valve is closed; when the circuit is connected, the air flow path is opened.

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