CN219244530U

CN219244530U - Automatic seat monitoring device for nut welding

Info

Publication number: CN219244530U
Application number: CN202223253172.9U
Authority: CN
Inventors: 吴源勇; ***; 孙淑波; 吕维强; 陈南金
Original assignee: Guangdong Hongbei Technology Co ltd
Current assignee: Guangdong Hongbei Technology Co ltd
Priority date: 2022-12-03
Filing date: 2022-12-03
Publication date: 2023-06-23
Anticipated expiration: 2032-12-03

Abstract

The automatic seat point monitoring device for nut welding comprises a nut detection mechanism and a control box, wherein the nut detection mechanism is used for detecting whether the nut placement state is correct or not; the nut detection mechanism is characterized by comprising an electrode seat (201), a nut electrode cover (213), a positioning pin (202), an electrode rod (203), a push rod (205), a fixed connecting rod (211), a connecting rod (212), a sleeve (204), a cylinder (206) and a displacement sensor (207); the electrode seat (201) is connected with the nut electrode cover (213) through self threads; the positioning pin (202) is installed in the nut electrode cover (213); the fixed connecting rod (211) is connected with the air cylinder (206) through self threads, and the electrode rod (203) is connected to the fixed connecting rod (211) through self threads.

Description

Automatic seat monitoring device for nut welding

Technical Field

The utility model relates to the field of mechanical automatic welding equipment, in particular to a seat point automatic monitoring device for nut welding, which is mainly used as an auxiliary device matched with a nut spot welder.

Background

In the manufacturing industry, many workpieces are joined by nuts and bolts, and particularly when sheet metal, sheet metal and other parts are to be joined by threads, nut welding is particularly important. The manufacturing and processing industries such as domestic vehicle manufacturing, mould manufacturing, sheet metal manufacturing and the like have higher and higher requirements on automation of welding equipment.

The publication No. CN204788250U discloses a projection spot welding intelligent detection device, which comprises an electrode matrix, a welding electrode head arranged at the top of the electrode matrix, a positioning pin arranged on the welding electrode head, a main control computer and a digital display screen, wherein an electric connector which can be connected with a PLC of the projection spot welding machine is arranged on the main control computer. The welding electrode head is provided with a guide hole for installing the positioning pin, the top of the positioning pin is provided with an end penetrating through the guide hole, the end is provided with a clamping position for placing a nut, the electrode base body is internally provided with a reset elastic piece and a displacement sensor, the reset elastic piece can eject the positioning pin to the top of the welding electrode head, the displacement sensor can detect the displacement of the positioning pin along the guide hole, and the displacement sensor and the digital display screen are connected with a main control computer. The bottom of the locating pin forms a limit lug below the welding electrode head, and when the locating pin is ejected to the top of the welding electrode head by the reset elastic piece, the limit lug can prop against the bottom of the welding electrode head. The bottom of the welding electrode head is connected with a guide sleeve, the bottom of the guide sleeve is provided with a sensor mounting seat, the displacement sensor is an optical fiber displacement sensor arranged on the sensor mounting seat, a spring cap is arranged below a positioning pin in the guide sleeve, and the reset elastic piece is a compression spring arranged between the spring cap and the sensor mounting seat. The gas source processing unit is connected with the gas path of the projection spot welding machine. The bottom of the electrode matrix is provided with a mounting plate which can be connected with the lower electrode of the projection spot welding machine and a cooling water gap which can be connected with a cooling water path of the projection spot welding machine. On the projection spot welding station, projection spot welding intelligent detection device passes through the mounting panel and is connected with projection spot welding machine lower electrode return circuit, is connected with projection spot welding machine's PLC through the electrical joint, is connected with projection spot welding machine's gas circuit through air supply processing unit, is connected with projection spot welding machine's cooling water route through the cooling mouth of a river, in the course of the work, on the punching press part was placed and is welded the electrode head, the locating pin passes through the nut centre bore to through the screens location of pointed end, projection spot welding cooling water return circuit water. Meanwhile, the air source processing unit is communicated with the air channel, and the protection of the optical fiber displacement sensor is carried out through the protection air channel. The electrode on the projection spot welding machine moves down to press the nut and the stamping part, the nut and the locating pin move downwards together, and after the position is stopped, the optical fiber displacement sensor judges whether the size, the position, the direction and the number of the nut and the stamping part are correct by detecting the downwards moving distance of the locating pin. And displaying in real time through a digital display screen. If one or more of the size, the position, the direction and the number of the nuts and the punched parts are wrong, the main control computer of the intelligent detection device for the projection spot welding does not send an electrifying welding signal to the PLC of the projection spot welding machine and alarms; if the size, the position, the direction and the number of the nuts and the punched parts are correct, the master control of the intelligent projection spot welding detection device can send an electrifying welding signal to the PLC of the projection spot welding machine through the electric joint, and the current forms a loop through the lower electrode of the projection spot welding machine, the mounting plate, the electrode matrix, the welding electrode head, the punched parts, the nuts and the upper electrode of the projection spot welding machine, so that the punched parts and the nuts are welded. After the welding is finished, the workpiece is taken away, the compression spring drives the positioning pin to retract to the initial position, and the projection spot welding intelligent detector is ready for detecting the next welding.

The inventor discovers that the technical scheme has the following defects: firstly, the situation that nuts are overlapped and placed at the positioning pins cannot be treated; the second monitoring principle is that the optical fiber displacement sensor judges whether the size, the position, the direction and the number of the nuts and the stamping parts are correct or not by detecting the downward moving distance of the positioning pin, and the optical fiber displacement sensor displays the sizes, the positions, the directions and the number of the nuts and the stamping parts in real time through the digital display screen. The judgment result is not accurate enough. Third, there is a lack of monitoring equipment for the cooling water.

Disclosure of Invention

In order to solve the problems, the utility model aims to provide an automatic seat point monitoring device for nut welding, which is more accurate in monitoring and wider in monitoring range.

The technical scheme of the utility model is as follows: the automatic seat point monitoring device for nut welding comprises a nut detection mechanism and a control box, wherein the nut detection mechanism is used for detecting whether the nut placement state is correct or not; the nut detection mechanism is characterized by comprising an electrode seat (201), a nut electrode cover (213), a positioning pin (202), an electrode rod (203), a push rod (205), a fixed connecting rod (211), a connecting rod (212), a sleeve (204), a cylinder (206) and a displacement sensor (207); the electrode seat (201) is connected with the nut electrode cover (213) through self threads; the positioning pin (202) is installed in the nut electrode cover (213); the fixed connecting rod (211) is connected with the air cylinder (206) through threads, and the electrode rod (203) is connected to the fixed connecting rod (211) through threads;

the push rod (205) is arranged in the electrode rod (203), one end of the push rod is connected to one end of a piston rod of the air cylinder (206) through the connecting rod (212), and the other end of the push rod directly supports the positioning pin (202); the displacement sensor (207) and the air cylinder (206) are arranged in the sleeve (204), a movable rod piece of the displacement sensor is in contact with the movable plate (208), the movable plate (208) is connected with the other end of a piston rod of the air cylinder (206), and a guide rod (209) penetrating through the movable plate (208) is arranged in the movable plate (208); the movable plate (208) can move along with a cylinder piston rod under the drive of the cylinder (206).

When the air cylinder (206) is started, the air cylinder piston rod is in a state of extending towards the end of the push rod (205) (namely, is always propped against the locating pin), and when the lower pressure of the upper electrode on the seat point (301) is larger than the force of the air cylinder piston rod propping against the locating pin, the locating pin is pressed down, and the descending displacement of the locating pin is the distance detected by the displacement sensor. And detecting the deviation between the distance value and the verification reference value, and judging whether the deviation is within the allowable deviation range of the reference value, so as to judge whether the nut placement state before welding is qualified.

Further, an upper stroke detection mechanism for detecting a distance by which the upper electrode descends is also included.

Further, the upper stroke detection mechanism comprises an electronic ruler (501), wherein the electronic ruler (501) is fixed on the seat point (301), and a movable part of the electronic ruler moves along with an upper electrode on the seat point. The movement distance of the upper electrode can be measured through the electronic ruler (501). And detecting whether the deviation between the distance value and the reference value is in a set deviation range, so as to judge whether the nut is in a superimposed state.

Further, a surrounding cooling water pipeline is arranged in the electrode seat (201) and used for timely reducing the temperature of the nut electrode cover during spot welding.

Further, the quick-acting gas connector (210) is used for connecting compressed air, and timely blowing out splashes or foreign matters falling into the nut electrode cover during the seat spot welding operation, so that the service life of the equipment is prolonged.

Further, the control box comprises a shell, a box body, a fixed mounting plate and a box body panel; wherein the shell is formed by bending metal plates; the fixed mounting plate (404) is fixed on the box body (401) through bolts, and a circuit board (403) is placed in the box body; the box body panel is provided with a touch screen (412), a ship-shaped power switch (411), a buzzer (410), a power indicator lamp (409), an abnormal reset button (408) and a counting reset button (407); two module combined connectors (405) and (406) which are integrated in a wired way are arranged at the bottom of the box body; the top of the box body is provided with a three-color alarm lamp (413).

Further, the spot welder further comprises an air pressure monitoring mechanism (601), wherein the air pressure monitoring mechanism (601) is connected in a total air inlet channel of the spot welder and used for detecting the air pressure of the spot welder during working and displaying the air pressure on a display screen in a digital mode. ( When the pressure of the detected high-pressure gas is lower than a set value, the system gives an alarm, and the equipment cannot weld; corresponding welding pressure can be set according to different products, and the welding pressure can be automatically switched when the products are switched. )

Further, the cooling water system further comprises a water flow detection mechanism (602), and the water flow detection mechanism (602) is connected in the seat point cooling water pipeline loop. The flow of cooling water can be monitored. When the cooling water is detected to be abnormal or no cooling water is detected, the system gives an alarm, and the equipment cannot weld.

Further, the spot welding machine further comprises a dotting counting mechanism, and the spot welding machine can perform welding counting according to welding current signals of the spot welding machine, so that the spot welding machine is accurate and reliable.

The working principle of the utility model is as follows: in the nut welding cycle process, the nut is firstly conveyed to the positioning pin of the lower electrode of the welding machine, and during the pressing of the pressing nut by the pressure head of the spot welder (before the spot welder does not perform discharge welding yet, the time is very short), the utility model can measure the change of the precise displacement in the nut pressing process by the precise displacement sensor, then the data is sampled to the MCU control center, and whether the nut placement state is correct or not is judged according to the pressing quantity, so that whether the welding machine performs discharge welding or not and whether false alarm is output or not is controlled, and the purpose of monitoring the nut welding is achieved.

The specific method is as follows: after the nut automatic conveyor conveys nuts to the positioning pins of the lower electrode of the welding machine, a completion signal is given to the welding machine, the welding machine starts to work, the upper electrode descends and gives a signal to the nut detection mechanism at the same time of descending, the upper electrode descends to completely compress the nuts, but before the welding machine discharges and welds, the nut detection mechanism completes detection of the descending distance of the upper electrode and the descending distance of the positioning pins of the lower electrode in the period of time, the measured value is compared with the previous check value, the welding machine is qualified in the allowable deviation range, namely, the welding machine is allowed to discharge and weld and count, otherwise, the welding machine is unqualified, the nut detection mechanism gives an alarm, the welding machine is forced not to discharge and weld, and the rejection rate of workpieces can be reduced.

The utility model has the beneficial effects that: the first, the utility model installs and sets up the small cylinder in the bottom electrode, can make the locating pin in the pole to stretch out the state all the time, reset to the cylinder resets; the displacement value of the locating pin detected in this way is more accurate.

The displacement sensor adopts a high-precision resistance sensor, and automatically resets by virtue of a spring, and the extension rod moves along with a piston rod of the air cylinder, so that the movement distance of the positioning pin can be measured more accurately;

thirdly, the utility model increases the upper travel detection mechanism, namely the detection of the descending distance of the upper electrode, so as to perform the alarm function of the position where the nut is overlapped and placed with the positioning pin;

fourth, the utility model adds the air pressure monitoring mechanism and the electric proportional valve. So that the welding machine can switch products when the pressure required by welding different workpieces is different.

Fifthly, the utility model adds a water flow meter (water flow detection mechanism) which can monitor the cooling water flow. When the cooling water is detected to be abnormal or no cooling water is detected, the system gives an alarm, and the equipment cannot weld.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 is a partial cross-sectional view of a nut spot welding mechanism of the present utility model welding a nut to a metal plate.

Fig. 3 is a schematic structural view of the nut spot welding mechanism of the present utility model.

Fig. 4 is a schematic cross-sectional view of the structure of fig. 3.

Fig. 5 is a view showing an opened state of a casing of the control box of the present utility model.

In the figure, 10, upper electrode; 11. a nut; 12. a metal plate; 13. a nut detection mechanism; 201. a motor base; 202. a positioning pin; 203. an electrode rod; 204. a sleeve; 205. a push rod; 206. a cylinder; 207. a displacement sensor; 208. a movable plate; 209. a guide rod; 210. a rapid gas joint; 211. fixing the connecting rod; 212. a connecting rod; 301. a seat point; 302. a lower electrode fixing member; 401. a control box; 402. a mounting support; 403. a circuit board; 404. a fixed mounting plate; 405. a first modular connector of the line integration; 406. a second module combination type connector of the wire integration; 407. a count reset button; 408. an abnormal reset button; 409. a power indicator light; 410. a buzzer; 411. a boat-type power switch; 412. a touch screen; 413. three-color alarm lamp electronic ruler; 502. fixing the support plate; 503. a connecting plate; 601. an air pressure monitoring mechanism; 602. and the water flow detection mechanism.

Detailed Description

The technical scheme of the utility model is described in detail below with reference to the accompanying drawings and examples.

As shown in the embodiments of fig. 1, 2, 3, 4 and 5, an automatic seat monitoring device for nut welding comprises a nut detection mechanism and a control box, wherein the nut detection mechanism is used for detecting whether the nut placement state is correct; the nut detection mechanism is characterized by comprising an electrode seat (201), a nut electrode cover (213), a positioning pin (202), an electrode rod (203), a push rod (205), a fixed connecting rod (211), a connecting rod (212), a sleeve (204), a cylinder (206) and a displacement sensor (207); the electrode seat (201) is connected with the nut electrode cover (213) through self threads; the positioning pin (202) is installed in the nut electrode cover (213); the fixed connecting rod (211) is connected with the air cylinder (206) through threads, and the electrode rod (203) is connected to the fixed connecting rod (211) through threads;

The above embodiments are preferred embodiments of the present utility model, and the present utility model is not limited to the above embodiments, but any obvious modifications made by those skilled in the art without departing from the technical principles of the present utility model are included in the spirit of the present utility model and the scope of the appended claims.

Claims

1. The automatic seat point monitoring device for nut welding comprises a nut detection mechanism and a control box, wherein the nut detection mechanism is used for detecting whether the nut placement state is correct or not; the nut detection mechanism is characterized by comprising an electrode seat (201), a nut electrode cover (213), a positioning pin (202), an electrode rod (203), a push rod (205), a fixed connecting rod (211), a connecting rod (212), a sleeve (204), a cylinder (206) and a displacement sensor (207); the electrode seat (201) is connected with the nut electrode cover (213) through self threads; the positioning pin (202) is installed in the nut electrode cover (213); the fixed connecting rod (211) is connected with the air cylinder (206) through threads, and the electrode rod (203) is connected to the fixed connecting rod (211) through threads;

2. The automatic seat point monitoring device for nut welding according to claim 1, further comprising an upper stroke detection mechanism for detecting a distance by which the upper electrode (10) descends.

3. The automatic seat point monitoring device for nut welding according to claim 2, characterized in that said upper stroke detection mechanism comprises an electronic ruler (501), said electronic ruler (501) being fixed on the seat point (301), the movable part of which moves with the upper electrode on the seat point.

4. The automatic seat point monitoring device for nut welding according to claim 1, wherein a surrounding cooling water pipe is provided inside the electrode seat (201) for timely reducing the temperature of the nut electrode cover during the seat point welding.

5. The automatic seat point monitoring device for nut welding according to claim 1, further comprising a quick air connection (210) for switching on compressed air.

6. The automatic seat point monitoring device for nut welding according to claim 1, wherein said control box comprises a housing, a box body, a fixed mounting plate and a box body panel; wherein the shell is formed by bending metal plates; the fixed mounting plate (404) is fixed on the box body (401) through bolts, and a circuit board (403) is placed in the box body; the box body panel is provided with a touch screen (412), a ship-shaped power switch (411), a buzzer (410), a power indicator lamp (409), an abnormal reset button (408) and a counting reset button (407); two module combined connectors (405) and (406) which are integrated in a wired way are arranged at the bottom of the box body; the top of the box body is provided with a three-color alarm lamp (413).

7. The automatic seat point monitoring device for nut welding according to claim 1, further comprising an air pressure monitoring mechanism (601), wherein the air pressure monitoring mechanism (601) is connected to a total air inlet channel of the seat spot welder and is used for detecting the air pressure of the welder during operation and displaying the air pressure on a display screen in a digital mode.

8. The automatic seat point monitoring device for nut welding according to claim 4, further comprising a water flow detection mechanism (602), said water flow detection mechanism (602) being connected in said seat point cooling water pipe circuit.

9. The automatic seat point monitoring device for nut welding according to claim 1, further comprising a dotting counting mechanism for performing welding counting according to a seat spot welder welding current signal.