Equipment for degreasing or pickling small-caliber precision pipe

Abstract

The utility model discloses equipment for degreasing or pickling a small-caliber precise pipe, belongs to the technical field of pipe surface treatment, and solves the technical problem that the comprehensive degreasing and pickling of the inner wall and the outer wall of the small-caliber precise pipe cannot be met through traditional standing soaking. The force application device is vertically and downwards arranged above the head end of the bottom plate, the baffle is fixedly arranged at the tail end of the bottom plate, and the balancing weight is installed below the tail end of the bottom plate; the pipes are movably placed in the grooves of the bottom plate, the tail ends of the pipes abut against the inner side faces of the baffles, the cover plate is arranged above the head ends of the pipes in a crossing mode, the piezoelectric transducers and the clamping jaws are arranged on the upper surface of the cover plate, and a gap is formed between the cover plate and the bottom plate. According to the device, the pipe swings repeatedly in the degreasing or pickling soaking process, gas in a pipe cavity of the small-caliber precise pipe can be discharged easily under the dual action of ultrasonic vibration, and the outer wall of the pipe can be comprehensively cleaned easily due to the fact that the pipe is alternately matched with the clamping jaws and the grooves.

Description

Technical Field

[0001] This utility model belongs to the field of pipe surface treatment technology, specifically relating to a device for degreasing or pickling small-diameter precision pipes. Background Technology

[0002] Small-diameter precision stainless steel seamless pipes typically refer to stainless steel seamless pipes with an outer diameter ≤10mm, high wall thickness accuracy, and good surface finish on both the inner and outer surfaces. Due to their excellent corrosion resistance, high strength, high dimensional accuracy, and good cleanliness, they are widely used in fields such as medical and biopharmaceutical, aerospace and military, precision instruments and electronics, energy and chemical, automotive and rail transportation, and food and beverage processing.

[0003] During the production process, small-diameter precision stainless steel seamless tubes have extremely high requirements for both internal and external surface quality, typically requiring consistent color and a roughness below 0.8μm. To ensure the required smoothness, both the internal and external surfaces of these precision stainless steel seamless tubes need lubrication during cold rolling. The inner wall is usually lubricated by spraying oil onto the mandrel, while the outer wall is lubricated by spraying oil onto the outer surface of the tube before rolling. After cold rolling, an oil scraper removes the lubricating oil adhering to the outer surface as the tube passes through the discharge port. The discharge rollers have a slight inclination angle, allowing the lubricating oil adhering to the inner wall to flow out naturally due to gravity and the smooth inner surface. This method of cleaning the inner and outer surfaces of the tubes cannot completely remove the surface lubricating oil, leaving a layer of grease on the surface of the tubes after cold rolling. This grease layer needs to be further degreased by alkaline cleaning. The conventional degreasing method involves immersing the tubes in a U-shaped tank filled with alkaline solution. After alkaline solution immersion and degreasing, the tubes are then rinsed in hot water at 70°C and dried before being placed in a heat treatment furnace for subsequent annealing.

[0004] Furthermore, cold-rolled stainless steel seamless pipes undergo significant cold deformation, resulting in severe work hardening. After degreasing, further annealing is required to relieve processing stress and promote recrystallization. Annealing leaves an oxide scale layer on the surface. Therefore, pickling to remove the oxide scale from annealed stainless steel seamless pipes is an essential step. Typically, the inner and outer surfaces are immersed in an acid solution to remove the oxide scale. After acid immersion, the pipes are rinsed in 70°C hot water, followed by manual cleaning using a high-pressure water gun. This process effectively removes residual acid and oxide scale from both the inner and outer surfaces.

[0005] In summary, both alkaline degreasing and acid pickling for oxide scale removal involve immersion in a U-shaped tank for surface cleaning. The advantage of this method is that multiple bundles of steel pipes can be cleaned simultaneously. However, the disadvantages include the static nature of the cleaning process, with contact remaining between the outer surfaces of the pipes, especially between small-diameter seamless stainless steel pipes. Furthermore, when the steel pipes are lifted by a single hook and placed into the U-shaped tank, the upward bending on both sides causes air to accumulate in the middle of the pipe's inner bore. This accumulated air cannot escape in time, resulting in some sections of the pipe's inner surface not reacting with the cleaning solution, making it difficult to guarantee the cleaning effect. Additionally, manually cleaning residual acid and oxide scale with a high-pressure water gun poses a safety risk of liquid and solid splashing, and the cold, damp environment in winter is unfavorable for manual operation. Utility Model Content

[0006] The main purpose of this utility model is to overcome the shortcomings of the existing technology and solve the technical problem that traditional static soaking cannot meet the requirements of comprehensive degreasing and pickling of the inner and outer walls of small-diameter precision pipes. This utility model provides a device for degreasing or pickling small-diameter precision pipes.

[0007] This utility model is achieved through the following technical solution: a device for degreasing or pickling small-diameter precision pipes, comprising a boom and a base plate, cover plate, baffle plate, and counterweight immersed in a degreasing tank or pickling tank, wherein...

[0008] The front and rear sides of the middle part of the base plate are respectively hinged to the lower part of the boom. A force application device is vertically downward installed above the front end of the base plate. A baffle is fixedly installed at the rear end of the base plate. A counterweight is installed below the rear end of the base plate.

[0009] Several grooves for storing pipes are provided on the bottom surface of the base plate along the length of the base plate. The pipes are movably placed in the grooves, with the tail end of the pipe close to the inner side of the baffle. The cover plate spans above the head ends of several pipes, and a gap is provided between the cover plate and the base plate. The cover plate and the base plate are detachably connected.

[0010] Piezoelectric transducers are respectively installed on both sides of the upper surface of the cover plate. The piezoelectric transducers utilize the piezoelectric effect of piezoelectric materials (such as quartz and piezoelectric ceramics)—when a high-frequency electrical signal is applied, the material will undergo periodic mechanical deformation, thereby generating ultrasonic vibration (electrical energy to mechanical energy conversion). Claws are respectively installed on the cover plate between the two piezoelectric transducers at the corresponding positions of the groove. When the force application device moves downward to press the cover plate, the tail end of the bottom plate rotates upward, and the claws are in the open state. When the force application device moves upward until it separates from the cover plate, the counterweight block drives the tail end of the bottom plate to rotate downward under its own weight, and the claws clamp the tube, so that the head end of the tube separates from the groove.

[0011] Furthermore, the force-applying device is a hydraulic cylinder or an electric cylinder.

[0012] Furthermore, the claw includes a first connecting rod, a second connecting rod, a support rod, a telescopic rod, and a spring symmetrically arranged on the left and right sides. The telescopic rod is installed vertically downward on the cover plate, and the lower end of the telescopic rod extends into the gap between the cover plate and the bottom plate. The root of the first connecting rod is hinged to the inner end face of the cover plate, the end of the first connecting rod is hinged to the root of the second connecting rod, and the end of the second connecting rod clamps the pipe. One end of the support rod is hinged to the lower end of the telescopic rod, and the other end of the support rod is hinged to the middle of the first connecting rod. The spring is located between the angle formed by the first connecting rod and the second connecting rod.

[0013] When the force-applying device moves downward to press the cover plate, the telescopic rod retracts upward, and the support rod drives the first connecting rod to open the second connecting rod, separating the pipe from the clamps. The pipe is located in the groove, at which point the outer wall of the pipe exposed outside the groove can be degreased. When the force-applying device moves upward until it separates from the cover plate, the telescopic rod extends downward, and the support rod drives the first connecting rod to close the second connecting rod, clamping the pipe from the groove. At this point, the outer wall of the pipe, except at the contact point, can be degreased.

[0014] Furthermore, a connecting lug is provided at the seam position between the cover plate and the outer side of the base plate.

[0015] Furthermore, the counterweight is movably mounted below the tail end of the base plate via a track, thereby allowing for weight adaptation to different pipe specifications by adjusting the length of the lever arm between the counterweight and the hinge position.

[0016] The beneficial effects of this utility model are as follows: On the one hand, based on the design principle of "seesaw", this utility model allows the pipe to swing intermittently or continuously during the degreasing or pickling process. On this basis, the piezoelectric transducer generates ultrasonic vibration, and the dual effect helps to expel the gas in the cavity of the small-diameter precision pipe. On the other hand, the pipe alternately cooperates with the claws and grooves, avoiding the "dead spots" that cannot be cleaned due to contact support during the pipe soaking process, which is more conducive to the comprehensive cleaning of the outer wall of the pipe. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the initial state of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the main structure of the present invention in use.

[0019] Figure 3 This is a top view of the structure of this utility model;

[0020] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure from the middle AA plane.

[0021] In the diagram, 1 is the base plate, 2 is the boom, 3 is the cover plate, 4 is the baffle, 5 is the pipe, 6-1 is the first connecting rod, 6-2 is the support rod, 6-3 is the second connecting rod, 6-4 is the spring, 6-5 is the telescopic rod, 7 is the piezoelectric transducer, 8 is the force application device, 9 is the counterweight, and 10 is the connecting lug. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 4 The device shown is for degreasing or pickling small-diameter precision pipes. It includes a boom 2 and a base plate 1, a cover plate 3, a baffle 4, and a counterweight 9 immersed in a degreasing or pickling tank.

[0024] The front and rear sides of the middle part of the base plate 1 are respectively hinged to the lower part of the boom 2. A force application device 8 is vertically downward installed above the front end of the base plate 1. The baffle 4 is fixedly installed at the rear end of the base plate 1. The counterweight 9 is installed below the rear end of the base plate 1.

[0025] A plurality of grooves for storing pipes 5 are provided on the bottom surface of the base plate 1 along the length direction of the base plate 1. The pipes 5 are movably placed in the grooves, and the tail end of the pipes 5 is close to the inner side of the baffle 4. The cover plate 3 is straddling above the head ends of the plurality of pipes 5. A gap is provided between the cover plate 3 and the base plate 1. The cover plate 3 and the base plate 1 are detachably connected.

[0026] Piezoelectric transducers 7 are respectively installed on both sides of the upper surface of the cover plate 3. The piezoelectric transducers 7 are electrically connected to an external power supply. Claws are respectively installed on the cover plate 3 between the two piezoelectric transducers 7 at the corresponding positions of the groove. When the force application device 8 moves downward to press the cover plate 3, the tail end of the bottom plate 1 rotates upward, and the claws are in the open state. When the force application device 8 moves upward until it separates from the cover plate 3, the counterweight 9 is driven by its own weight to rotate the tail end of the bottom plate 1 downward, and the claws clamp the pipe 5, so that the head end of the pipe 5 separates from the groove.

[0027] Furthermore, the force-applying device 8 is a hydraulic cylinder or an electric cylinder.

[0028] Furthermore, the claw includes a first connecting rod 6-1, a second connecting rod 6-3, a support rod 6-2, a telescopic rod 6-5, and a spring 6-4 symmetrically arranged on the left and right sides. The telescopic rod 6-5 is vertically mounted on the cover plate 3, and the lower end of the telescopic rod 6-5 extends into the gap between the cover plate 3 and the bottom plate 1. The root of the first connecting rod 6-1 is hinged to the inner end face of the cover plate 3, and the end of the first connecting rod 6-1 is hinged to the root of the second connecting rod 6-3. The end of the second connecting rod 6-3 clamps the pipe 5. One end of the support rod 6-2 is hinged to the lower end of the telescopic rod 6-5, and the other end of the support rod 6-2 is hinged to the middle of the first connecting rod 6-1. The spring 6-4 is located between the angle formed by the first connecting rod 6-1 and the second connecting rod 6-3.

[0029] When the force-applying device 8 moves downward to press the cover plate 3, the telescopic rod 6-5 retracts upward, and the support rod 6-2 drives the first connecting rod 6-1 to open the second connecting rod 6-3, separating the pipe 5 from the claw, and the pipe 5 is located in the groove; when the force-applying device 8 moves upward until it separates from the cover plate 3, the telescopic rod 6-5 extends downward, and the support rod 6-2 drives the first connecting rod 6-1 to close the second connecting rod 6-3, and the claw clamps the pipe 5 and separates it from the groove.

[0030] Furthermore, a connecting lug 10 is provided at the seam position between the cover plate 3 and the outer side of the base plate 1.

[0031] Furthermore, the counterweight 9 is movably mounted below the tail end of the base plate 1 via a track.

[0032] The usage process of this utility model is as follows (this embodiment takes the degreasing process as an example; the pickling process follows the same principle):

[0033] S1. The counterweight 9, under its own weight, causes the tail end of the base plate 1 to move downward to the lower stroke termination position, and the pipe 5 is placed in the corresponding groove, with the tail end of the pipe 5 close to the inner side of the baffle 4; then, the cover plate 3 is fastened, and the cover plate 3 is fixedly connected to the connecting lug 10 of the base plate 1 by bolts; finally, an alkaline solution is added to the U-shaped degreasing tank until the base plate 1, cover plate 3, baffle 4 and counterweight 9 are submerged.

[0034] S2. Activate the force application device 8 and piezoelectric transducer 7. The force application device 8 moves downward to press the cover plate 3. The tail end of the base plate 1 rotates upward against the gravity of the counterweight. The piezoelectric transducer 7 generates ultrasonic vibration. The dual action promotes the discharge of gas from the cavity of the small-diameter precision pipe. At the same time, the telescopic rod 6-5 retracts upward, and the support rod 6-2 drives the first connecting rod 6-1 to open the second connecting rod 6-3. The pipe 5 separates from the claw, and the outer wall of the pipe exposed outside the groove is degreased.

[0035] S3. The force application device 8 moves upward until it separates from the cover plate 3. The counterweight 9 rotates downward due to its own weight. At the same time, the telescopic rod 6-5 extends downward. The support rod 6-2 drives the first connecting rod 6-1 to retract the second connecting rod 6-3. The cleaver clamps the pipe 5 so that the head end of the pipe 5 separates from the groove. At this time, the outer wall of the pipe can be degreased except at the contact position.

[0036] S4. Repeat steps S2 to S3 intermittently or continuously as needed until the predetermined degreasing time is completed, then remove pipe 5 for subsequent pickling operations.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A device for degreasing or pickling small-diameter precision pipes, comprising a boom (2) and a base plate (1), a cover plate (3), a baffle (4), and a counterweight (9) immersed in a degreasing tank or pickling tank, characterized in that, The front and rear sides of the middle part of the base plate (1) are respectively hinged to the lower part of the boom (2). A force application device (8) is vertically downward above the front end of the base plate (1). A baffle (4) is fixedly installed at the rear end of the base plate (1). A counterweight (9) is installed below the rear end of the base plate (1). On the bottom surface of the base plate (1), a plurality of grooves for storing pipes (5) are provided along the length direction of the base plate (1). The pipes (5) are movably placed in the grooves, and the tail end of the pipes (5) is close to the inner side of the baffle (4). The cover plate (3) is straddling above the head end of the plurality of pipes (5). A gap is provided between the cover plate (3) and the base plate (1). The cover plate (3) and the base plate (1) are detachably connected. Piezoelectric transducers (7) are respectively provided on both sides of the upper surface of the cover plate (3). Claws are respectively provided on the cover plate (3) between the two piezoelectric transducers (7) at the corresponding positions of the groove. When the force application device (8) moves downward to press the cover plate (3), the tail end of the bottom plate (1) rotates upward, and the claws are in the open state. When the force application device (8) moves upward until it separates from the cover plate (3), the counterweight (9) is driven by its own weight to rotate the tail end of the bottom plate (1) downward, and the claws clamp the pipe (5), so that the head end of the pipe (5) separates from the groove.

2. The equipment for degreasing or pickling small-diameter precision pipes according to claim 1, characterized in that, The force-applying device (8) is a hydraulic cylinder or an electric cylinder.

3. The equipment for degreasing or pickling small-diameter precision pipes according to claim 1, characterized in that, The chuck includes a first connecting rod (6-1), a second connecting rod (6-3), a support rod (6-2), a telescopic rod (6-5), and a spring (6-4) symmetrically arranged on the left and right sides. The telescopic rod (6-5) is installed vertically downward on the cover plate (3), and the lower end of the telescopic rod (6-5) extends into the gap between the cover plate (3) and the bottom plate (1). The root of the first connecting rod (6-1) is hinged to the inner end face of the cover plate (3), the end of the first connecting rod (6-1) is hinged to the root of the second connecting rod (6-3), and the end of the second connecting rod (6-3) clamps the pipe (5). One end of the support rod (6-2) is hinged to the lower end of the telescopic rod (6-5), and the other end of the support rod (6-2) is hinged to the middle of the first connecting rod (6-1). The spring (6-4) is located between the angle formed by the first connecting rod (6-1) and the second connecting rod (6-3). When the force-applying device (8) moves downward to press the cover plate (3), the telescopic rod (6-5) retracts upward, and the support rod (6-2) drives the first connecting rod (6-1) to open the second connecting rod (6-3), separating the pipe (5) from the claw, and the pipe (5) is located in the groove; when the force-applying device (8) moves upward until it separates from the cover plate (3), the telescopic rod (6-5) extends downward, and the support rod (6-2) drives the first connecting rod (6-1) to close the second connecting rod (6-3), and the claw clamps the pipe (5) and separates it from the groove.

4. The equipment for degreasing or pickling small-diameter precision pipes according to claim 1, characterized in that, Connecting lugs (10) are provided at the seam between the cover plate (3) and the outer side of the bottom plate (1).

5. The equipment for degreasing or pickling small-diameter precision pipes according to claim 1, characterized in that, The counterweight (9) is mounted on the bottom plate (1) below the tail end via a track.

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