Special liquid tank for automated submerged press fitting

Abstract

The present invention discloses a special liquid pool for automated underwater press-fitting operation, comprising a pool body, in which a sufficient amount of press-fitting liquid is poured, and a tooling rotating mechanism for driving a tooling to rotate horizontally is arranged in the middle of the pool body; the tooling is provided with a horizontal arm and a longitudinal arm connected in an L-shape, the horizontal arm extends in a ray direction centered at the point where the tooling rotating axis is located, and the longitudinal arm is connected to the tooling rotating mechanism; a press-fitting fixture immersed under the press-fitting liquid surface is arranged on the horizontal arm; and a liquid return port is passed through the bottom of the pool body. The beneficial effects of the present invention are: high-speed press-fitting can be achieved, and reliable press-fitting quality is ensured.

Description

Technical Field

[0001] The invention belongs to the field of mechanical equipment, in particular to a special liquid pool for automated underwater press-fitting operations. Background Art

[0002] During the manufacturing and assembly process of some automobile parts, it is necessary to completely exhaust the internal air, so the underwater pressing method is adopted. For example, the Chinese patent document CN102734374A, on October 17, 2012, disclosed a "new type of hydraulic bushing suspension", "including a bracket, a main spring and a leather cup, the bracket includes an annular bracket outer ring, the main spring is located in the bracket outer ring, a working chamber is arranged between the main spring and the inner wall of the bracket outer ring, and the working chamber is located below the main spring, and the characteristics are: the leather cup is arranged at the upper end of the main spring, and a compensation chamber located above the main spring is formed between the leather cup and the inner wall of the bracket outer ring, and the compensation chamber and the working chamber are connected through a flow channel arranged between the bracket outer ring and the main spring; the advantages are: the new type of hydraulic bushing suspension of the present invention avoids leakage, meets the limit requirements in all directions, the rigidity and stability of the hydraulic suspension are increased, and the service life is extended". This device requires the use of the underwater pressing process. The traditional underwater press-fitting process uses a simple liquid pool to hold the press-fitting liquid, and then manually or semi-automatically immerses the part to be processed below the liquid surface, and then uses a special tube for press-fitting to inject the press-fitting liquid into the part cavity until it is full. In order to avoid splashing and foaming of the press-fitting liquid in the liquid pool, the movement amplitude should not be too large and the speed should not be too fast during operation. Therefore, the traditional operation has the defects of high speed and low efficiency. Even so, it is still difficult to ensure that the air in the part cavity is completely discharged, and there are still quality risks. Summary of the invention

[0003] The speed of cleaning and drying parts in existing underwater press-fitting operations is high and the efficiency is low, and it is difficult to ensure that the air in the part cavity is completely discharged. Based on the above problems, the present invention provides a special liquid pool for automated underwater press-fitting operations, which can achieve high-speed press-fitting and ensure reliable press-fitting quality.

[0004] In order to achieve the purpose of the invention, the present invention adopts the following technical scheme: a liquid pool specially used for automated underwater pressing operation, including a pool body, in which a sufficient amount of pressing liquid is poured, and a tooling rotation mechanism for driving the tooling to rotate horizontally is provided in the middle of the pool body; the tooling is provided with a horizontal arm and a longitudinal arm connected in an L shape, the horizontal arm extends in a ray direction with the point where the tooling rotation axis is located as the center, and the longitudinal arm is connected to the tooling rotation mechanism; a pressing fixture immersed under the pressing liquid surface is provided on the horizontal arm; a liquid return port is passed through the bottom of the pool body.

[0005] The special liquid pool for automated underwater press-fitting operation designed in this technical solution includes a pool body. The pool body is generally a liquid containing space excluding the top, and the shape can be round or rectangular, without special requirements. In order to reduce space occupation, it is generally appropriate to be round on the premise of meeting the use requirements. A sufficient amount of press-fitting liquid is poured into the pool. A tooling rotating mechanism is provided in the middle of the pool, which is connected by power, and can not only rotate by itself, but also drive the tooling connected to the tooling rotating mechanism to revolve. The tooling of this solution is L-shaped, the longitudinal arm is fixedly connected to the tooling rotating mechanism, the cross arm is connected below the longitudinal arm, and a press-fitting fixture is installed on the cross arm, which can be matched and fixed with the part to be operated. After the press-fitting fixture is matched and fixed with the part to be operated, the whole is immersed below the liquid surface of the press-fitting liquid to ensure that the press-fitting operation is completed below the liquid surface and will not be disturbed by the air on the liquid surface. The number of tools is generally multiple, with the rotating shaft of the tooling rotating mechanism as the center, and the cross arms of each tooling are arranged in a radial shape. The tooling rotating mechanism can use existing structures such as cams to drive each tooling to rotate cyclically and stop at each station in turn for automated press-fitting operations. A liquid return port is provided at the bottom of the tank body, and during press-fitting operations, the press-fitting liquid in the tank will flow downward through the liquid return port at the same time. The liquid return port is large enough and the flow rate is fast enough during outflow, which can absorb and take away the foam near the liquid return port, eliminating the risk of press-fitting air into the parts to be processed.

[0006] Preferably, the position of the liquid return port corresponds to the press-fitting station of the press-fitting fixture on the tooling. The tooling is driven by the tooling rotating mechanism to rotate, and as long as the position of the liquid return port is set as close as possible to the press-fitting station of the press-fitting fixture on the tooling, for example, directly below, the foam at the station during the press-fitting operation can be eliminated to the greatest extent.

[0007] Preferably, the lower opening of the liquid return port is connected to a liquid return pipe, and the liquid return pipe is connected to a suction pump. Without external force intervention, the flow of the pressurized liquid out of the liquid return port depends only on gravity, and the outflow action has a lag, and the control operation is also relatively difficult. After using the suction pump, the start and stop of the suction pump can be controlled to achieve an instantaneous impact on the liquid flow action of the liquid return port, thereby significantly improving the response speed, eliminating the lag phenomenon, and speeding up the operation.

[0008] Preferably, a liquid inlet is provided on the side wall of the tank body, and a defoaming net is installed on the downstream side of the liquid inlet. The press-packed liquid in the tank body is replenished through the liquid inlet. In order to eliminate the foam caused by the replenished press-packed liquid, a defoaming net is installed on the downstream side of the liquid inlet. The defoaming net can be adapted to use an existing conventional industrial defoaming net. The press-packed liquid normally consumed by the press-packing operation can also be replenished by conducting it to the liquid inlet through a separate conduit.

[0009] Preferably, the upstream side of the liquid inlet is connected to the downstream side of the suction pump through a liquid inlet pipe. Through the connection between the liquid inlet pipe and the suction pump, the pressurized liquid flowing out of the liquid return port is returned to the tank body, the pressurized liquid is fully utilized, and the cost can be significantly saved.

[0010] Preferably, a solenoid valve is installed on the liquid return pipe, and the solenoid valve is connected to the remote control center signal. The solenoid valve cooperates with the suction pump to create a more compact instantaneous suction effect, and to the greatest extent eliminate the hysteresis phenomenon of the pressurized liquid flowing out of the liquid return pipe. The remote control center is usually equipped with control components such as a single-chip microcomputer, which controls the actions of each component through a preset program to achieve efficient, unmanned, stable and reliable automated operation.

[0011] Preferably, a flow meter is installed on the liquid inlet pipe; the flow meter is an electronic flow meter connected to the remote control center signal. The flow meter is used to control the amount of press-packing liquid entering the liquid pool through the liquid inlet pipe, so as to ensure that the circulation speed and amount of the press-packing liquid meet the process requirements.

[0012] As a preferred embodiment, a liquid level switch is also installed on the side wall of the liquid pool, and the liquid level switch is connected to the remote control center signal. The liquid level switch is a safety mechanism to ensure that the extreme value of the high and low changes of the liquid level in the liquid pool will not exceed the safety limit.

[0013] Preferably, the bottom and side walls of the tank body are provided with a heat-insulating layer. The temperature of the press-packing liquid is required to be lower than room temperature, and the liquid tank needs to be heat-insulated.

[0014] Preferably, the structure of the thermal insulation layer is as follows: the bottom and side walls of the tank body are both hollow structures, which are filled with thermal insulation cotton. By filling the hollow layer with thermal insulation cotton, no condensation water will be generated, which can ensure that the proportion of the press-filled liquid will not be disturbed by the inflow of condensation water, and in the absence of water immersion, the service life of the thermal insulation layer can be effectively extended.

[0015] In summary, the beneficial effects of the present invention are: high-speed press-fitting can be achieved and reliable press-fitting quality can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the present invention.

[0017] Among them: 1 pool body, 2 tooling, 21 horizontal arm, 22 longitudinal arm, 23 press-fit fixture, 3 return liquid pipe, 4 defoaming net, 5 liquid inlet pipe, 6 flow meter, 7 liquid level switch, 8 thermal insulation cotton, X1 parts jacket, X2 parts finished products. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 1 The embodiment shown is a special liquid pool for automated underwater press-fitting operation, which is applied to underwater press-fitting of automobile part bushings.

[0020] The dedicated liquid pool for automated underwater press-fitting in this example includes a pool body 1, which is circular in shape, with a bottom extending in the horizontal direction and surrounded by side walls. A sufficient amount of press-fitting liquid is poured into the pool body. The press-fitting liquid in this example is a glycol mixed liquid, which requires a constant temperature (lower than the working environment temperature) and no bubbles. Therefore, the bottom and side walls of the pool body are both provided with a heat-insulating layer. In this example, the bottom and side walls of the pool body are both hollow structures, which are filled with heat-insulating cotton 8.

[0021] A tooling rotating mechanism is installed in the middle of the pool body. The power of the tooling rotating mechanism comes from the motor and can rotate around the longitudinal axis. A number of tools 2 are connected to the tooling rotating mechanism, 6 in this case. The tooling is provided with a horizontal arm 21 and a longitudinal arm 22. The horizontal arm is connected to the lower end of the longitudinal arm, so that the tooling is L-shaped. The longitudinal arm is fixed to the tooling rotating mechanism, and the horizontal arm extends in the direction of the ray centered on the point where the tooling rotating axis is located. A pressing fixture 23 is provided on the outer end of the horizontal arm to clamp the part jacket X1, and the pressing fixture clamps the part jacket as a whole and is immersed below the level of the pressing liquid. The tooling rotating mechanism rotates under the drive of the motor, driving the tooling to revolve, and through the cam mechanism, each tooling stops in turn at different stations such as loading, pressing, and unloading. A positioning cylinder is also installed on the tooling rotating mechanism to accurately position the tooling at the pressing station.

[0022] The side wall of the tank body is provided with a liquid inlet, which is located at the lower right part of the tank body (not shown in the figure). The upstream of the liquid inlet is connected to the liquid inlet pipe 5, and the downstream outlet is installed with a defoaming net 4. A flow meter 6 is installed on the liquid inlet pipe. The flow meter is an electronic flow meter and also has the function of a thermometer, and is connected to the remote control center signal.

[0023] There are 4 liquid return ports (not shown in the figure) at the bottom of the tank body, which are located directly below the press-fitting station of the press-fitting fixture on the tooling. The return port is connected to the return pipe 3 downstream, and a solenoid valve is installed on the return pipe, which is connected to the remote control center signal.

[0024] The downstream side of the liquid return pipe is connected to a suction pump (not shown in the figure), and the suction pump is connected to the upstream side of the liquid inlet pipe, so that the pressurized liquid forms a cycle through the liquid pool, liquid return port, liquid return pipe, suction pump, liquid inlet pipe, and liquid inlet.

[0025] A liquid level switch 7 is also installed on the side wall of the liquid pool, and the liquid level switch is connected to the remote control center signal to keep the liquid level of the pressurized liquid in the pool body always within the highest and lowest safety limits.

[0026] The working state of the dedicated liquid pool for automated underwater press-fitting operation in this example is that the tool rotates counterclockwise driven by the tool rotating mechanism, and stops at each station in turn under the action of the cam mechanism. When it stops at the press-fitting station, the cylinder is activated to accurately position the tool, and the press-fitting manipulator (not shown in the figure) automatically presses the part jacket on the press-fitting fixture. At the same time, the remote control center controls the suction pump to generate negative pressure through the return liquid port, and sucks the press-fitting liquid around the press-fitting station at a high speed and large flow rate, and sucks away the foam that may be generated, ensuring that there is no interference from foam during the press-fitting process, and no air is pressed into the parts. The press-fitting liquid sucked by the suction pump returns to the pool body through the liquid inlet and is recycled. The parts that have completed the press-fitting become the finished parts X2, and as the tool rotates to the discharging station, the discharging manipulator (not shown in the figure) completes the automatic discharging. This cycle is repeated. The press-fitting liquid normally consumed by the press-fitting operation is supplemented by connecting to the liquid inlet through a separate conduit.

Claims

1. A liquid tank for automated underwater press-fitting operation, comprising a tank body (1), wherein a sufficient amount of press-fitting liquid is poured into the tank body, wherein: A tooling rotating mechanism for driving the tooling (2) to rotate horizontally is provided in the middle of the tank body; the tooling is provided with a horizontal arm (21) and a longitudinal arm (22) connected in an L shape, the horizontal arm extending in a ray direction centered at the point where the tooling rotating axis is located, and the longitudinal arm is connected to the tooling rotating mechanism; a pressing fixture (23) immersed under the pressing liquid surface is provided on the horizontal arm; a liquid inlet is provided on the side wall of the tank body, and a liquid return port is passed through the bottom of the tank body; the lower end opening of the liquid return port is connected to a liquid return pipe (3), and the liquid return pipe is connected to a suction pump; the upstream side of the liquid inlet is connected to the downstream side of the suction pump through a liquid inlet pipe (5); during the pressing operation, the pressing liquid in the tank will simultaneously flow downward through the liquid return port.

2. The special liquid pool for automated underwater press-fitting operation according to claim 1 is characterized in that: The position of the liquid return port corresponds to the pressing station of the pressing fixture on the tooling.

3. A special liquid pool for automated underwater press-fitting operation according to claim 1 or 2, characterized in that: A defoaming net (4) is installed on the downstream side of the liquid inlet.

4. A special liquid pool for automated underwater press-fitting operation according to claim 1 or 2, characterized in that: A solenoid valve is installed on the liquid return pipe, and the solenoid valve is connected to the remote control center signal.

5. The special liquid pool for automated underwater press-fitting operation according to claim 4 is characterized in that: A flow meter (6) is installed on the liquid inlet pipe; the flow meter is an electronic flow meter and is connected to the remote control center signal.

6. The special liquid tank for automated underwater press-fitting operation according to claim 4 is characterized in that: A liquid level switch (7) is also installed on the side wall of the liquid pool, and the liquid level switch is connected to the remote control center signal.

7. A special liquid pool for automated underwater press-fitting operation according to claim 1 or 2, characterized in that: The bottom and side walls of the pool body are both provided with heat-insulating layers.

8. The special liquid pool for automated underwater press-fitting operation according to claim 7 is characterized in that: The structure of the thermal insulation layer is as follows: the bottom and side walls of the pool body are both hollow structures, which are filled with thermal insulation cotton (8).

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