Tin liquid supplementing device of piezoresistor welding tin furnace

Abstract

The utility model discloses a tin liquid supplementing device of a piezoresistor welding tin furnace, which comprises a rack, a tin liquid tank, a tin bar placing cylinder, a tin melting mechanism, a tin bar limiting mechanism and a liquid level sensing mechanism, and the tin liquid tank, the tin bar placing cylinder, the tin melting mechanism and the liquid level sensing mechanism are respectively arranged on the rack. An opening in the lower end of the tin bar placing cylinder is communicated with a tin inlet of the tin melting mechanism, and a tin outlet of the tin melting mechanism is communicated with the tin liquid tank; the tin bar limiting mechanism comprises a limiting piece and a limiting piece telescopic driving device, the limiting piece telescopic driving device is installed on the machine frame or the tin bar containing barrel, a through hole matched with the limiting piece is formed in the lower portion of the side wall of the tin bar containing barrel, and the limiting piece is arranged on the lower portion of the tin bar containing barrel in the mode that the limiting piece can move inside and outside along the through hole; and the sensing end of the liquid level sensing mechanism is positioned in the tin liquid tank. The tin liquid supplementing device can automatically supplement tin liquid after the tin liquid is consumed to a certain degree, manual work is not needed, and the cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to resistor manufacturing equipment, in particular to a tin liquid replenishing device for a varistor welding tin furnace. Background Art

[0002] When producing varistors, CP wires need to be welded on both sides of the varistor chip. When welding, the formed CP wires need to be inserted into the varistor chip first, and then the CP wires need to be immersed in the tin liquid, and finally welded. The current way to dip the resistor into the tin liquid is to fix the resistor, and then immerse the resistor in tin by raising and lowering the tin liquid tank. As the tin liquid in the tin liquid tank is consumed, the liquid level of the tin liquid will continue to decrease. Since the amplitude of each rise and fall of the tin liquid tank is uniform, in order to avoid the occurrence of cold solder joints due to insufficient tin, it is necessary to monitor the liquid level of the tin liquid in the tin liquid tank and replenish the tin liquid in time. However, the monitoring and replenishment of the tin liquid level usually require manual operation. This method is not only costly, but also prone to failure to replenish tin in time or excessive tin replenishment in actual work, which affects product quality. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a tin liquid replenishing device for a varistor soldering tin furnace, which can automatically replenish the tin liquid after the tin liquid is consumed to a certain extent, without manual labor, and can effectively reduce costs.

[0004] In order to solve the above technical problems, the technical solutions adopted are as follows:

[0005] A tin liquid replenishing device for a varistor soldering tin furnace comprises a frame and a tin liquid tank, which is mounted on the frame and is characterized in that it also comprises a tin bar placing cylinder, a tin melting mechanism, a tin bar limiting mechanism and a liquid level sensing mechanism, which are respectively mounted on the frame, the lower end opening of the tin bar placing cylinder is connected to the tin inlet of the tin melting mechanism, and the tin outlet of the tin melting mechanism is connected to the tin liquid tank; the tin bar limiting mechanism comprises a limiting member and a limiting member telescopic driving device capable of driving the limiting member to extend into or retract in the tin bar placing cylinder, the limiting member telescopic driving device is mounted on the frame or the tin bar placing cylinder, a through hole matching the limiting member is opened at the lower part of the side wall of the tin bar placing cylinder, and the limiting member can be movably arranged at the lower part of the tin bar placing cylinder along the through hole; the sensing end of the liquid level sensing mechanism is in the tin liquid tank, and the signal output end of the liquid level sensing mechanism is electrically connected to the signal input end of the limiting member telescopic driving device.

[0006] In the above-mentioned tin liquid replenishing device, when there is no need to replenish the tin liquid, the tin bar is placed in the tin bar placement cylinder under the obstruction of the limiter; the tin liquid tank contains tin liquid, and the liquid level sensing mechanism detects the height of the tin liquid level. As the tin liquid is continuously used, the tin liquid level gradually decreases; when the liquid level sensing mechanism detects that the tin liquid level has dropped to a certain level, the liquid level sensing mechanism sends a signal to the limiter telescopic driving device, and the limiter telescopic driving device drives the limiter to retract from the through hole to the outside of the tin bar placement cylinder, and no longer blocks the tin bar. At this time, the tin bar can fall into the tin melting mechanism along the tin bar placement tube; then the tin melting mechanism gradually melts the tin bar into tin liquid, and replenishes the tin liquid in the tin liquid tank; after the tin liquid is replenished, the liquid level of the tin liquid in the tin liquid tank rises again until the liquid level sensing mechanism can detect the liquid level again, and the limiter telescopic drive device drives the limiter to extend into the tin bar placement tube, thereby pushing the unmelted tin bar to the side wall of the tin bar placement tube, and cooperating with the side wall of the tin bar placement tube to clamp the tin bar until the next time the tin liquid needs to be replenished. This tin liquid replenishing device can automatically replenish the tin liquid after the tin liquid is consumed to a certain extent, and there will be no excessive or insufficient tin replenishment, avoiding the phenomenon of excessive tin on the product or cold soldering due to insufficient tin. It has a simple structure, does not require manual labor, and has low cost.

[0007] The above-mentioned inner and outer directions are determined according to the position of the tin bar placement tube, the position close to the axis of the tin bar placement tube is the inner side, and the position far from the axis of the tin bar placement tube is the outer side.

[0008] In the preferred embodiment, the telescopic drive device of the limiter includes a cylinder and a solenoid valve for controlling the inlet and outlet directions of the cylinder, the solenoid valve is mounted on the frame, the cylinder is mounted on the tin bar placement tube, and the piston rod of the cylinder is arranged in the inner and outer directions, the limiter is connected to the piston rod of the cylinder; the signal output end of the liquid level sensing mechanism is electrically connected to the signal input end of the solenoid valve. When the liquid level of the tin liquid in the tin liquid tank drops to a level that cannot be sensed by the liquid level sensing mechanism, the liquid level sensing mechanism sends a signal to the solenoid valve, and the solenoid valve controls the limiter to retract from the through hole to the outside of the tin bar placement tube through the cylinder; when the liquid level rises again to be sensed by the liquid level sensing mechanism, the liquid level sensing mechanism sends a signal to the solenoid valve, and the solenoid valve controls the limiter to extend into the tin bar placement tube through the cylinder.

[0009] In a further preferred embodiment, the liquid level sensing mechanism extends into the tin liquid tank from above, and the sensing end of the liquid level sensing mechanism is located at the upper part of the tin liquid tank. The liquid level sensing mechanism determines whether the tin liquid needs to be replenished based on whether the liquid level of the tin liquid submerges the liquid level sensing mechanism. When the height of the tin liquid drops to a level that is not enough to submerge the liquid level sensing mechanism, the tin liquid needs to be replenished.

[0010] In a preferred embodiment, the liquid level sensing mechanism is a sensing probe.

[0011] In the preferred embodiment, the tin melting mechanism includes a tin melting furnace and a tin liquid flow channel, which are respectively installed on the frame, and the tin melting furnace and the tin liquid flow channel are both provided with a tin inlet and a tin outlet, the tin inlet of the tin melting furnace opens upward, and the tin inlet of the tin melting furnace is connected to the lower end opening of the tin bar placement tube, and the tin outlet of the tin melting furnace is connected to the tin inlet of the tin liquid flow channel; the tin liquid flow channel extends from the tin melting furnace to the tin liquid tank, and the tin outlet of the tin liquid flow channel corresponds to the position of the tin liquid tank. After the tin bar falls from the tin bar placement tube, it is first melted by the tin melting furnace, and after being converted into tin liquid, it flows into the tin liquid tank through the tin liquid flow channel. The tin melting furnace can adopt an existing structure.

[0012] In a further preferred embodiment, the tin outlet of the tin liquid flow channel is located at the upper edge of the side wall of the tin liquid tank.

[0013] In another further preferred embodiment, the tin liquid flow channel extends from the tin outlet of the tin melting furnace to the inside of the tin liquid tank. Whether the tin liquid flow channel sets the tin outlet on the upper edge of the side wall of the tin liquid tank, or directly extends into the inside of the tin liquid tank, the fluctuation of the tin liquid can be reduced as much as possible when the tin liquid is replenished, so that the tin liquid level remains stable, so that the product can still maintain a good tinning effect during the process of replenishing the tin liquid.

[0014] The beneficial effect of the utility model is that the tin liquid replenishing device can automatically replenish the tin liquid after the tin liquid is consumed to a certain extent, without manual labor, and can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the tin liquid replenishing device in the initial state in Example 1 of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the tin liquid replenishing device when the limiting member cooperates with the side wall of the tin bar placement tube to clamp the tin bar in Example 1 of the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0018] Embodiment 1, as Figure 1-2The tin liquid replenishing device of a varistor soldering tin furnace shown in the figure comprises a frame 1, a tin liquid tank 2, a tin bar placing cylinder 3, a tin melting mechanism 4, a tin bar limiting mechanism 5 and a liquid level sensing mechanism 6. The tin liquid tank 2, the tin bar placing cylinder 3, the tin melting mechanism 4 and the liquid level sensing mechanism 6 are respectively installed on the frame 1, the lower end opening of the tin bar placing cylinder 3 is connected to the tin inlet of the tin melting mechanism 4, and the tin outlet of the tin melting mechanism 4 is connected to the tin liquid tank 2; the tin bar limiting mechanism 5 comprises a limiting member 501 and a limiting member 502 that can drive the limiting member 503. The limit member 501 extends into or retracts the limit member telescopic driving device 502 in the tin bar placing tube 3, and the limit member telescopic driving device 502 is installed on the tin bar placing tube 3. A through hole matching the limit member 501 is opened at the lower part of the side wall of the tin bar placing tube 3, and the limit member 501 can be movably arranged in and out of the through hole at the lower part of the tin bar placing tube 3; the sensing end of the liquid level sensing mechanism 6 is in the tin liquid tank 2, and the signal output end of the liquid level sensing mechanism 6 is electrically connected to the signal input end of the limit member telescopic driving device 502.

[0019] In the above-mentioned tin liquid replenishing device, when there is no need to replenish the tin liquid, the tin bar 7 is stopped by the stopper 501 and is placed in the tin bar placement tube 3 (such as Figure 1 As shown); the tin liquid tank 2 contains tin liquid, and the liquid level sensing mechanism 6 detects the height of the tin liquid level. As the tin liquid is continuously used, the tin liquid level gradually decreases; when the liquid level sensing mechanism 6 detects that the tin liquid level has dropped to a certain level, the liquid level sensing mechanism 6 sends a signal to the limiter telescopic driving device 502, and the limiter telescopic driving device 502 drives the limiter 501 to retract from the through hole to the outside of the tin bar placement tube 3, and no longer blocks the tin bar 7. At this time, the tin bar 7 can be placed along the tin bar. The tube 3 falls into the tin melting mechanism 4; then the tin melting mechanism 4 gradually melts the tin bar 7 into tin liquid, and replenishes the tin liquid in the tin liquid tank 2; after the tin liquid is replenished, the liquid level of the tin liquid in the tin liquid tank 2 rises again, until the liquid level sensing mechanism 6 can detect the liquid level again, the limit member telescopic driving device 502 drives the limit member 501 to extend into the tin bar placement tube 3, thereby pushing the unmelted tin bar 7 to the side wall of the tin bar placement tube 3, and cooperating with the side wall of the tin bar placement tube 3 to clamp the tin bar 7 (such as Figure 2 As shown in the figure, the tin liquid is replenished until the next time the tin liquid is needed. This tin liquid replenishing device can automatically replenish the tin liquid after the tin liquid is consumed to a certain extent, and will not cause excessive or insufficient tin replenishment, thereby avoiding the phenomenon of excessive tin on the product or cold soldering due to insufficient tin. It has a simple structure, does not require manual labor, and has a low cost.

[0020] The above-mentioned inner and outer directions are determined according to the position of the tin bar placement tube 3, the position close to the axis of the tin bar placement tube 3 is the inner side, and the position far from the axis of the tin bar placement tube 3 is the outer side.

[0021] The limit member telescopic driving device 502 includes a cylinder 5021 and a solenoid valve 5022 for controlling the air inlet and outlet direction of the cylinder 5021. The solenoid valve 5022 is installed on the frame 1, and the cylinder 5021 is installed on the tin bar placement tube 3. The piston rod of the cylinder 5021 is arranged along the inward and outward directions, and the limit member 501 is connected to the piston rod of the cylinder 5021; the signal output end of the liquid level sensing mechanism 6 is electrically connected to the signal input end of the solenoid valve 5022. When the liquid level of the tin liquid in the tin liquid tank 2 drops to a level that cannot be sensed by the liquid level sensing mechanism 6, the liquid level sensing mechanism 6 sends a signal to the solenoid valve 5022, and the solenoid valve 5022 controls the limit member 501 to retract from the through hole to the outside of the tin bar placement tube 3 through the cylinder 5021; when the liquid level rises again to be sensed by the liquid level sensing mechanism 6, the liquid level sensing mechanism 6 sends a signal to the solenoid valve 5022, and the solenoid valve 5022 controls the limit member 501 to extend into the tin bar placement tube 3 through the cylinder 5021.

[0022] The liquid level sensing mechanism 6 extends into the tin liquid tank 2 from above, and the sensing end of the liquid level sensing mechanism 6 is located at the upper part of the tin liquid tank 2. The liquid level sensing mechanism 6 determines whether the tin liquid needs to be replenished based on whether the liquid level of the tin liquid submerges the liquid level sensing mechanism 6. When the height of the tin liquid drops to a level that is not enough to submerge the liquid level sensing mechanism 6, the tin liquid needs to be replenished.

[0023] The liquid level sensing mechanism 6 is a sensing probe.

[0024] The tin melting mechanism 4 includes a tin melting furnace 401 and a tin liquid flow channel 402, which are respectively mounted on the frame 1. The tin melting furnace 401 and the tin liquid flow channel 402 are both provided with a tin inlet and a tin outlet. The tin inlet of the tin melting furnace 401 opens upward, and the tin inlet of the tin melting furnace 401 is connected to the lower end opening of the tin bar placement tube 3, and the tin outlet of the tin melting furnace 401 is connected to the tin inlet of the tin liquid flow channel 402; the tin liquid flow channel 402 extends from the tin melting furnace 401 to the tin liquid tank 2, and the tin outlet of the tin liquid flow channel 402 corresponds to the position of the tin liquid tank 2. After the tin bar 7 falls from the tin bar placement tube 3, it is first melted by the tin melting furnace 401, and after being converted into tin liquid, it flows into the tin liquid tank 2 through the tin liquid flow channel 402.

[0025] The tin outlet of the tin liquid flow channel 402 is located at the upper edge of the side wall of the tin liquid tank 2.

[0026] Embodiment 2, the difference between this embodiment and embodiment 1 is that: the tin liquid flow channel extends from the tin outlet of the tin melting furnace to the inside of the tin liquid tank. Whether the tin liquid flow channel sets the tin outlet on the upper edge of the side wall of the tin liquid tank, or directly extends into the inside of the tin liquid tank, it can reduce the fluctuation as much as possible when the tin liquid is replenished, so that the tin liquid level remains stable, so that the product can still maintain a good tinning effect during the process of replenishing the tin liquid.

Claims

1. A tin liquid replenishing device for a varistor soldering tin furnace, comprising a frame and a tin liquid tank, wherein the tin liquid tank is mounted on the frame. Features: It also includes a tin bar placement cylinder, a tin melting mechanism, a tin bar limiting mechanism and a liquid level sensing mechanism. The tin bar placement cylinder, the tin melting mechanism and the liquid level sensing mechanism are respectively installed on the frame. The lower end opening of the tin bar placement cylinder is connected to the tin inlet of the tin melting mechanism, and the tin outlet of the tin melting mechanism is connected to the tin liquid tank; the tin bar limiting mechanism includes a limiting member and a limiting member telescopic driving device capable of driving the limiting member to extend into or retract in the tin bar placement cylinder. The limiting member telescopic driving device is installed on the frame or the tin bar placement cylinder. A through hole matching the limiting member is opened at the lower part of the side wall of the tin bar placement cylinder, and the limiting member can be movably arranged in and out of the through hole at the lower part of the tin bar placement cylinder; the sensing end of the liquid level sensing mechanism is in the tin liquid tank, and the signal output end of the liquid level sensing mechanism is electrically connected to the signal input end of the limiting member telescopic driving device.

2. A tin liquid replenishing device for a varistor soldering tin furnace as claimed in claim 1, Features: The limit member telescopic driving device includes a cylinder and a solenoid valve for controlling the inlet and outlet directions of the cylinder. The solenoid valve is installed on the frame, the cylinder is installed on the tin bar placement tube, and the piston rod of the cylinder is arranged along the inward and outward directions. The limit member is connected to the piston rod of the cylinder; the signal output end of the liquid level sensing mechanism is electrically connected to the signal input end of the solenoid valve.

3. A tin liquid replenishing device for a varistor soldering tin furnace as claimed in claim 2, Features: The liquid level sensing mechanism extends into the tin liquid tank from above, and the sensing end of the liquid level sensing mechanism is located at the upper part of the tin liquid tank.

4. A tin liquid replenishing device for a varistor soldering tin furnace as claimed in claim 1, Features: The liquid level sensing mechanism is a sensing probe.

5. A tin liquid replenishing device for a varistor soldering tin furnace as claimed in claim 1, Features: The tin melting mechanism comprises a tin melting furnace and a tin liquid flow channel, which are respectively mounted on the frame, and both the tin melting furnace and the tin liquid flow channel are provided with a tin inlet and a tin outlet, the tin inlet of the tin melting furnace is opened upward, and the tin inlet of the tin melting furnace is communicated with the lower end opening of the tin bar placement cylinder, and the tin outlet of the tin melting furnace is communicated with the tin inlet of the tin liquid flow channel; the tin liquid flow channel extends from the tin melting furnace to the tin liquid tank, and the tin outlet of the tin liquid flow channel corresponds to the position of the tin liquid tank.

6. A tin liquid replenishing device for a varistor soldering tin furnace as claimed in claim 5, Features: The tin outlet of the tin liquid flow channel is located at the upper edge of the side wall of the tin liquid tank.

7. A tin liquid replenishing device for a varistor soldering tin furnace as claimed in claim 5, Features: The tin liquid flow channel extends from the tin outlet of the tin melting furnace to the inside of the tin liquid tank.

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