Drying mechanism special for welding shaft, cleaning machine and normal-temperature cleaning process

Abstract

The invention discloses a special drying mechanism for a welding shaft, a cleaning machine and a normal-temperature cleaning process, and solves the problems that equipment is large in occupied area, high in price and low in cleaning efficiency when high-pressure cleaning is carried out on the welding shaft in an existing method; high-temperature cleaning or chemical solvent cleaning is high in energy consumption, and the requirements of energy conservation, emission reduction and environmental protection are not met. A BONDERITE C-AK RM23 type low-temperature cleaning agent with the concentration of 2%-3% is added in the cleaning process, and the cleanliness of the welding shaft and the requirement for the blanking temperature are improved through a physical and chemical combined method at the normal temperature. The problems of high energy consumption, long heating time, unstable process, environmental pollution, substandard cleanliness and the like caused by high-temperature and high-pressure cleaning are solved, and the operation and maintenance cost of cleaning equipment is reduced. And the welding shaft can be dried in a rotating and multi-angle mode, human intervention is not needed in the whole process, the automation degree is high, flexibility is high, and the normal-temperature cleaning effect on the welding shaft is better.

Description

Technical Field

[0001] The invention relates to metal processing and manufacturing technology, and in particular to a drying mechanism, a cleaning machine and a normal-temperature cleaning technology dedicated to a welding shaft. Background Art

[0002] In the metal processing and manufacturing industry, the welding shaft is a key component for connection and support, and its quality and performance have an important impact on the stability and reliability of the entire product. However, during the welding process, due to factors such as high temperature, solder splashing and oxidation reaction, impurities such as oil, welding slag, and oxides often adhere to the surface of the welding shaft.

[0003] Traditionally, in order to remove these impurities, welding shafts are usually cleaned using high-pressure cleaning, CNC cleaning machines, ultrasonic and other equipment. However, these devices occupy a large area, are expensive, have low cleaning efficiency (cleaning time 2 minutes), and have high power per unit (the total power of the cleaning equipment is about 450kw, accounting for more than 50% of the total power of the production line, of which the heating power is about 150kw), and are not suitable for workshop operations.

[0004] The cleaning process usually adopts high-temperature cleaning or chemical solvent cleaning. The high-temperature cleaning process uses a high concentration of cleaning agent, usually between 3% and 4%, and the liquid is changed once a week, resulting in serious cost waste. In addition, high-temperature cleaning can only remove part of the oil and welding slag, which cannot meet the requirements of welded shaft cleanliness. At the same time, the high-temperature cleaning process requires a lot of energy consumption and the cleaning time is long. Excluding heat loss, 3.5 kWh of electricity is required for each 1°C increase in water temperature. The higher the temperature, the greater the heat loss and the more energy consumption, which is not conducive to energy conservation, emission reduction and environmental protection requirements. In addition, high-temperature cleaning also causes a large amount of steam overflow, corroding equipment components and polluting the environment.

[0005] In addition, through the study of the substances and their chemical composition that may exist on the surface of the welded shaft after the welding process, they mainly include solid particles such as metal oxides, silicates, fluorides, sulfides, etc. in the welding slag, as well as a small amount of gaseous harmful substances such as ozone and nitrogen oxides. Through a large number of experiments, it was found that after these substances were cleaned with ordinary high-temperature cleaning agents and normal-temperature cleaning agents, a large amount of welding ash and welding slag still existed, which could not meet the cleanliness requirements and became a pain point in the manufacturing industry.

[0006] In Chinese patent CN107775142A, a Fast Gear welding shaft welding process is disclosed, which includes the following steps: a1, derusting and degreasing the transmission gear and shaft with degreasing and rust removal purification liquid, and cleaning and drying; a2, selection of welding method and welding materials, arc welding is selected for welding, and MG600 is selected as welding rod; a3, the transmission gear and shaft are fixed in the fixture; a4, welding is performed at the intersection of the transmission gear and the shaft, and the welding height and width shall not exceed the size of the subsequent weld; a5, arc welding is adopted, the welding current is 250-280A, the welding voltage is 50-90V, the welding angle is 65-80 degrees relative to the end face of the cylinder, and the welding speed is 180-200mm per minute; a6, the weld is polished and the spatter on the surface of the Fast Gear welding shaft is cleaned; the specific cleaning process and cleaning parameters are not disclosed in the patent, and it is uncertain whether the technical problems existing in high-pressure and high-temperature cleaning can be solved. Summary of the invention

[0007] The purpose of the present invention is to solve the technical problems that the existing methods for high-pressure cleaning of welded shafts have large equipment footprint, high price and low cleaning efficiency; and high-temperature cleaning or chemical solvent cleaning consumes a lot of energy, which is not conducive to energy conservation, emission reduction and environmental protection requirements. By providing a drying mechanism, a cleaning machine and a normal temperature cleaning process dedicated to welded shafts.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] The present invention provides a drying mechanism for a welding shaft, comprising a mounting plate, which is fixedly connected to the ground through a bracket; the mounting plate is connected to a left rotating shaft and a right rotating shaft through bearings respectively, the left rotating shaft and the right rotating shaft are located at the upper part of the mounting plate and connected to a rotating driving mechanism, and the lower part is respectively connected to one end of an L-shaped connecting rod, and the lower end is respectively connected to a straight nozzle; the side wall of the L-shaped connecting rod is connected to a first drying nozzle facing the middle;

[0010] The left rotating shaft, the right rotating shaft, and the L-shaped connecting rod are all provided with air flow channels, and the left rotating shaft, the right rotating shaft and the air flow channels in the corresponding L-shaped connecting rod are communicated with each other, and are used to output compressed gas to the straight nozzle and the first drying nozzle;

[0011] A fixed support of the welding shaft is respectively arranged at the lower end of each straight nozzle.

[0012] Further, the rotary drive mechanism includes a controller, a power motor, a motor bracket, a transmission gear and two pinions, and the controller is connected to the power motor;

[0013] The power motor is fixedly connected to the mounting plate through a motor bracket, the working end of the power motor is connected to the central axis of the transmission gear, and two pinions are respectively sleeved on the left rotating shaft and the right rotating shaft, and the two pinions are meshed with the transmission gear. The power motor is controlled by a controller to drive the transmission gear to rotate, and the pinions meshed with the transmission gear drive the left rotating shaft and the right rotating shaft to rotate, thereby realizing the rotational blowing of the first drying nozzle, and can dry the welding shaft fixedly connected to the fixed support 360° without dead angles.

[0014] Furthermore, the fixed support is also fixedly connected to an infrared sensor, which is connected to the controller. The infrared sensor is used to sense the welding shaft on the fixed support, so as to automatically control the drying of the welding shaft without human intervention.

[0015] Furthermore, the fixed support is also connected to a liquid receiving tray, and the fixed support is also connected to an air flow pipe, one end of the air flow pipe is connected to an air inlet valve, and the other end is connected to a second drying nozzle, and the output end of the second drying nozzle is arranged upward, and the liquid on the welding shaft can be received through the liquid receiving tray. Compressed air is introduced into the air flow pipe, and then the bottom surface of the welding shaft is dried through the second drying nozzle.

[0016] Furthermore, the first drying nozzle and the second drying nozzle are both V-shaped drying nozzles, which can rotate at multiple angles to dry out the moisture in the deep groove structure of the welding shaft.

[0017] Furthermore, a protective plate is also connected to the mounting plate.

[0018] The present invention also provides a cleaning machine dedicated to a welding shaft, which is equipped with the above-mentioned drying mechanism dedicated to a welding shaft.

[0019] The present invention also provides a room temperature cleaning process dedicated to a welding shaft, which is also special in that it includes the following steps:

[0020] Step 1, start the built-in cleaning machine, set the cleaning time to 23S-27S, and add 2%-3% BONDERITE C-AK RM23 low-temperature cleaning agent into the cleaning liquid tank of the cleaning machine;

[0021] Step 2: The welding shaft is transferred to the special cleaning fixture of the cleaning machine by the manipulator, and cleaning is performed at room temperature according to the set cleaning time, and the cleaning pressure is adjusted;

[0022] Step 3: Take out the cleaned welding shaft through the robot, place it in the drying mechanism for drying, and set the drying pressure ≥ 0.4Mpa and the air volume ≥ 140m 3 / min, drying time 23S-27S;

[0023] Step 4: Take out the welding shaft through the robot, return it to the loading station of the cleaning machine, complete the room temperature cleaning process of the welding shaft, clamp it through the robot and put it on the unloading track for the next process, repeat in sequence, no human intervention is required throughout the process, the degree of automation is high, and it is flexible and compatible with all welding shaft products. The cleaning process is room temperature cleaning, and the unloading temperature requirements can be met without cooling.

[0024] Considering "alkaline non-phosphatase + octanoic acid", the special chelating agent, dispersant and inorganic alkali combination cleaning agent has the characteristics of low activity, which is very easy to clean chemical substances such as welding ash and welding slag without damaging the surface of the welded shaft. "2-aminoethanol" and "pyridinethiol derivatives" are compounded in the cleaning agent to solve the problems of high foaming, easy bacteria and odor, and low life of the cleaning liquid at low temperature. Therefore, BONDERITE C-AK RM23 low-temperature cleaning agent is selected in the present invention for cleaning, and the cleaned welded shaft does not need to be cooled to meet the material unloading temperature requirements.

[0025] Furthermore, in step 1, the cleaning time is set to 23S-27S.

[0026] Furthermore, in step 2, the range of adjusting the cleaning pressure is 0.5Mpa-0.6Mpa.

[0027] Furthermore, in step 3, the drying mechanism uses intermittent blowing in a pulsed form to save compressed air.

[0028] Beneficial effects of the present invention:

[0029] 1. The invention discloses a special normal temperature cleaning process for welding shafts, which improves the cleanliness and material temperature requirements of welding shafts by combining physical and chemical methods at room temperature. It solves the problems of high energy consumption, long heating time, unstable process, environmental pollution, substandard cleanliness, etc. caused by high temperature and high pressure cleaning, and reduces the operation and maintenance costs of cleaning equipment.

[0030] 2. The present invention provides a special normal temperature cleaning process for welding shafts, which uses pulsed intermittent air blowing to save compressed air.

[0031] 3. The drying mechanism of the welding shaft of the present invention can rotate and blow dry the welding shaft at multiple angles without human intervention in the whole process, with a high degree of automation and strong flexibility, and has a better effect on the room-temperature cleaning of the welding shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view of an embodiment of a drying mechanism for a welding shaft of the present invention;

[0033] Figure 2 It is a side view of an embodiment of a drying mechanism for a welding shaft of the present invention;

[0034] Figure 3 This is a comparison chart of cleaning agent consumption in a normal temperature cleaning process and a high temperature cleaning process dedicated to a welding shaft of the present invention;

[0035] Figure 4 The cleaning effect diagram of the normal temperature cleaning process and the high temperature cleaning process specially used for the welding shaft of the present invention.

[0036] Among them, 1-transmission gear, 2-left rotating shaft, 3-right rotating shaft, 4-straight nozzle, 5-L-type connecting rod, 6-liquid receiving tray, 7-intake valve, 8-protective plate, 9-power motor, 10-infrared sensor, 11-controller, 12-fixed support, 13-mounting plate, 14-first blow-drying nozzle, 15-second blow-drying nozzle, 16-motor bracket. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The drying device of a traditional cleaning machine generally adopts a fixed nozzle, but due to the deep groove structure of the welding shaft and the shaft blocking the overflow of water during drying. Based on this, the present invention analyzes and studies the structure of the welding shaft and designs a unique drying nozzle structure - a rotating fixed-point positioning drying structure, which solves the problem that the welding shaft cannot be dried. The specific structure is as follows:

[0039] In this embodiment, a drying mechanism for a welding shaft is installed inside a cleaning machine to achieve 100% drying of all welding assembly products. Figure 1 and Figure 2 As shown, it includes a mounting plate 13, which is fixedly connected to the ground through a bracket; the mounting plate 13 is connected to the left rotating shaft 2 and the right rotating shaft 3 through bearings respectively, the left rotating shaft 2 and the right rotating shaft 3 are located at the upper part of the mounting plate 13 and are fixedly connected to the pinion gears respectively, and the lower part is respectively connected to one end of the L-shaped connecting rod 5, and the lower end is respectively connected to the straight nozzle 4; the side wall of the L-shaped connecting rod 5 is connected to the first blow-drying nozzle 14 facing the middle; the first blow-drying nozzle 14 is a V-shaped blow-drying nozzle, the power motor 9 is fixedly connected to the mounting plate 13 through a motor bracket, the working end of the power motor 9 is connected to the central axis of the transmission gear 1, and the two pinions are meshed with the transmission gear 1.

[0040] The left rotating shaft 2, the right rotating shaft 3, and the L-shaped connecting rod 5 are all provided with air flow channels, and the left rotating shaft 2, the right rotating shaft 3 are in communication with the air flow channels in the corresponding L-shaped connecting rod 5, for outputting compressed gas to the straight nozzle 4 and the first drying nozzle 14;

[0041] A fixed support 12 of the welding shaft is respectively arranged at the lower end of each straight nozzle 4. An infrared sensor 10 is also fixedly connected to the fixed support 12, and the infrared sensor 10 is connected to the controller 11. The infrared sensor 10 is used to sense the welding shaft on the fixed support 12. A liquid receiving tray 6 is also connected to the fixed support 12, and an airflow pipe is also connected to the fixed support 12. One end of the airflow pipe is connected to the air inlet valve 7, and the other end is connected to the second drying nozzle 15. The second drying nozzle 15 is a V-shaped drying nozzle; the output end of the second drying nozzle 15 is arranged upward.

[0042] The mounting plate 13 is also connected to a protective plate 8 to protect structures such as the power motor 9 .

[0043] When in use, the welding shaft is fixedly connected to the fixed support 12, and the welding shaft is sensed by the infrared sensor 10, which triggers the controller 11 to drive the power motor 9; the power motor 9 drives the transmission gear 1, the pinion, the left rotating shaft 2, and the right rotating shaft 3 to rotate, and then drives the two L-shaped connecting rods 5 to rotate around the welding shaft; at the same time, compressed gas is introduced into the air flow channels opened in the left rotating shaft 2, the right rotating shaft 3, and the L-shaped connecting rod 5, and then the straight nozzle 4 and the first blowing nozzle 14 output compressed gas to the side and upper top surface of the welding shaft to blow dry the side and upper top surface; because in this embodiment, the first blowing nozzle 14 is a V-shaped blowing nozzle, and adopts the method of compressed air rotation blowing, it can effectively blow dry the moisture in the deep groove structure of the welding shaft 360° without dead angles.

[0044] In this embodiment, a second drying nozzle 15 for blowing air upward is also designed to dry the moisture at the bottom of the welding shaft.

[0045] In this embodiment, a cleaning machine dedicated to a welding shaft is also provided, which is equipped with the above-mentioned drying mechanism dedicated to a welding shaft, and can realize the integration of cleaning and drying.

[0046] Based on the cleaning machine equipped with the drying mechanism of the welding shaft, this embodiment also discloses a special normal temperature cleaning process for the welding shaft, including the following steps:

[0047] Step 1: Turn on the cleaning machine, set the cleaning time to 25 seconds, and add 2%-3% BONDERITE C-AK RM23 low-temperature cleaning agent into the cleaning liquid tank of the cleaning machine;

[0048] Step 2: Use the robot to transfer the welding shaft to the special cleaning fixture of the cleaning machine, clean it at room temperature according to the set cleaning time, and adjust the cleaning pressure to 0.5Mpa;

[0049] Step 3: Take out the cleaned welding shaft through the robot, place it in the drying mechanism and blow it dry with pulsed intermittent air blowing. Set the blowing pressure to 0.7Mpa and the air volume to 140m 3 / min, drying time 24S;

[0050] Step 4: Take out the welding shaft through the manipulator, return it to the loading station of the cleaning machine, and complete the normal temperature cleaning process of the welding shaft; repeat in sequence, without human intervention, with a high degree of automation and strong flexibility, compatible with all welding shaft products. And the cleaning process is normal temperature cleaning, no cooling is required to meet the unloading temperature requirements. Normal temperature cleaning can ensure that the parts are at normal temperature. After cleaning, the impurity mass content on the welding shaft is ≤0.55mg / kg, the maximum metal particle is ≤600um, and the parts are completely dry.

[0051] In order to illustrate the cleaning process effect in this embodiment, a normal temperature cleaning process dedicated to the welding shaft of this embodiment is used to clean the welding shaft in combination with a drying mechanism, and a high temperature cleaning process is used to clean the welding shaft. The cleaning agent consumption is compared. Figure 3 shown.

[0052] according to Figure 3 It can be seen that by using the cleaning process of this embodiment, the daily energy consumption of a single machine is reduced by about 400KWh. It is applied to Gaozhixin's welding shaft unit line, with excellent results and good feedback from the workshop. The cleaning temperature is reduced from the original 60°C to 20°C, achieving a comprehensive cost reduction of about 160,000 yuan / year. At the same time, it solves the problems of difficult cleaning of welding shafts and substandard cleanliness, long waiting time for on-site heating, steam overflow corroding equipment and polluting the environment, and rapid reaching of the unloading temperature to room temperature. It shortens the process time and improves the stability of the process parameter temperature.

[0053] Cleaning effect comparison Figure 4 As shown, (a) is the cleaning effect of this embodiment; (b) is the high temperature cleaning effect. By comparison, it can be seen that the cleaning effect of the cleaning process in this embodiment is better.

[0054] After using the room temperature cleaning process for the welded shaft of the present invention, there is no need to purchase large equipment. A dual-channel medium-pressure cleaning machine can meet the demand, the purchase cost is reduced, and the efficiency is improved; the purchase cost, cleaning time, and floor space of large equipment are shown in Table 1.

[0055] Table 1

[0056] type Purchase cost Cleaning time Area Mechanical high pressure cleaner About 3 million 2min big Ultrasonic cleaning machine About 2 million 2min middle Medium pressure dual channel cleaning machine About 1 million 30s Small

[0057] Through the above comparison, it can be seen that in the special room temperature cleaning process for a welded shaft disclosed in this embodiment, after using a BONDERITE C-AK RM23 low-temperature cleaning agent with a concentration of 2%-3% and a cleaning machine with improved drying equipment, the cleanliness and dryness are better than those of high-temperature cleaning and neutral low-temperature cleaning agents, the unloading temperature is 25±3°C, the tank liquid life is ≥15 days, and the energy consumption of a single machine is reduced by about 400KWh / day.

[0058] The above description is only a specific embodiment of the present invention, and a comparison of the effects of the specific embodiments and the related comparative examples, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A drying mechanism dedicated to welding shafts, characterized in that: The utility model comprises a mounting plate (13), wherein the mounting plate (13) is fixedly connected to the ground via a bracket; the mounting plate (13) is respectively connected to a left rotating shaft (2) and a right rotating shaft (3) via bearings; the left rotating shaft (2) and the right rotating shaft (3) are located at the upper part of the mounting plate (13) and are connected to a rotating driving mechanism; the lower part is respectively connected to one end of an L-shaped connecting rod (5), and the lower end is respectively connected to a straight nozzle (4); the side wall of the L-shaped connecting rod (5) is connected to a first drying nozzle (14) facing the middle; The left rotating shaft (2), the right rotating shaft (3), and the L-shaped connecting rod (5) are all provided with air flow channels, and the left rotating shaft (2), the right rotating shaft (3) and the air flow channels in the corresponding L-shaped connecting rod (5) are in communication with each other, and are used to output compressed gas to the straight nozzle (4) and the first drying nozzle (14); A fixed support (12) for the welding shaft is respectively arranged at the lower end of each straight nozzle (4).

2. A drying mechanism dedicated to welding shafts according to claim 1, characterized in that: The rotary drive mechanism comprises a controller (11), a power motor (9), a motor bracket (16), a transmission gear (1) and two pinions, wherein the controller (11) is connected to the power motor (9); The power motor (9) is fixedly connected to the mounting plate (13) via a motor bracket, the working end of the power motor (9) is connected to the central axis of the transmission gear (1), the two pinions are respectively sleeved on the left rotating shaft (2) and the right rotating shaft (3), and the two pinions are meshed with the transmission gear (1).

3. A drying mechanism dedicated to welding shafts according to claim 2, characterized in that: The fixed support (12) is also fixedly connected to an infrared sensor (10), the infrared sensor (10) is connected to the controller (11), and the infrared sensor (10) is used to sense the welding shaft on the fixed support (12).

4. A drying mechanism dedicated to welding shafts according to claim 1, characterized in that: The fixed support (12) is also connected to a liquid receiving tray (6), and the fixed support (12) is also connected to an air flow pipe, one end of the air flow pipe is connected to an air inlet valve (7), and the other end is connected to a second drying nozzle (15), and the output end of the second drying nozzle (15) is arranged upward.

5. A drying mechanism dedicated to welding shafts according to claim 4, characterized in that: The first drying nozzle (14) and the second drying nozzle (15) are both V-shaped drying nozzles.

6. A drying mechanism dedicated to welding shafts according to claim 1, characterized in that: The mounting plate (13) is also connected to a protective plate (8).

7. A cleaning machine for welding shafts, characterized in that: A drying mechanism dedicated to a welding shaft as described in any one of claims 1-6 is built in.

8. A room temperature cleaning process for welding shafts, characterized in that: The following steps are involved: Step 1, start the cleaning machine of claim 7, set the cleaning time to 23s-27s, and add BONDERITE C-AK RM23 low-temperature cleaning agent with a concentration of 2%-3% into the cleaning liquid tank of the cleaning machine; Step 2: The welding shaft is transferred to the special cleaning fixture of the cleaning machine by the manipulator, and cleaning is performed at room temperature according to the set cleaning time, and the cleaning pressure is adjusted; Step 3: Take out the cleaned welding shaft through the robot, place it in the drying mechanism for drying, and set the drying pressure ≥ 0.4Mpa and the air volume ≥ 140m 3 / min, drying time 23S-27S; Step 4: Take out the welding shaft through the robot and return it to the loading station of the cleaning machine to complete the room temperature cleaning process of the welding shaft.

9. A room temperature cleaning process for welding shafts according to claim 7, characterized in that: In step 2, the cleaning pressure is adjusted to a range of 0.5Mpa-0.6Mpa.

10. A room temperature cleaning process for welding shafts according to claim 7, characterized in that: In step 3, the drying mechanism uses intermittent air blowing in a pulsed form.

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