A clamping device for a hollow piston paint spray

Abstract

The utility model provides a kind of clamping device for hollow piston paint spraying, belong to hollow piston processing equipment technical field, including fixed frame, clamping mechanism, conveying mechanism and inflation cavity. Conveying mechanism is located inside fixed frame, conveying mechanism includes conveyer belt, and multiple positioning slots with air hole are equipped on conveyer belt, inflation cavity is located at the bottom of upper conveyer belt, and dynamic seal is formed with the bottom of conveyer belt;Clamping mechanism includes rotating shaft, inflation support block and sliding block, rotating shaft is installed in positioning slot by connecting plate, rotating shaft is rotatably installed in sliding block, inflation support block is arranged on rotating shaft, and inflation support block is communicated with air hole;When conveyer belt drives clamping mechanism to move to inflation cavity, inflation cavity supplies gas to inflation support block through air hole to make it expand and support workpiece from workpiece inner wall, avoid the direct contact of clamp and outer surface, eliminate the dead angle of leakage spraying brought by outer clamping type clamping, ensure that workpiece outer surface is evenly painted in whole area, improve production efficiency and coating integrity.

Description

Technical Field

[0001] This utility model relates to the field of hollow piston production equipment, specifically a clamping device for painting hollow pistons. Background Technology

[0002] Hollow pistons are increasingly being used in automotive engines, hydraulic systems, and various high-precision industrial equipment due to their significant lightweight characteristics and excellent heat dissipation performance. These components play a crucial role in reducing overall weight and improving thermal management efficiency, making them particularly suitable for applications requiring high efficiency and reliability. However, because hollow pistons have a hollow structure and their outer surfaces often exhibit complex arc or irregular curved surfaces, stable clamping and fixation during the painting process has become a key technical challenge.

[0003] Existing clamping methods have the following main problems: First, when using an external clamping method, the clamp inevitably comes into direct physical contact with the outer surface of the piston, resulting in the paint film not being able to cover the contact area, forming so-called "spray-missing dead zones." This not only affects the appearance quality but also often requires additional manual touch-up spraying, significantly reducing overall production efficiency and severely damaging the consistency and integrity of the coating. Second, traditional clamping devices generally lack multi-axis rotation or automatic angle adjustment functions. Therefore, during painting operations, operators usually need to manually adjust the piston posture or move the spray gun position. This process makes it difficult to accurately control the spraying distance and angle, easily leading to uneven coating thickness and coverage, ultimately affecting the stability and repeatability of the product coating quality. Utility Model Content

[0004] In order to overcome some of the problems mentioned in the background above, this utility model provides a clamping device for hollow piston painting.

[0005] The technical solution adopted by this utility model is as follows: a clamping device for hollow piston spraying, including a fixing frame, a clamping mechanism, a conveying mechanism and an air filling chamber; The conveying mechanism is located inside the fixed frame. The conveying mechanism includes a conveyor belt with multiple positioning grooves with ventilation holes. The inflation chamber is located at the bottom of the upper conveyor belt and forms a dynamic seal with the bottom of the conveyor belt. The clamping mechanism includes a rotating shaft, an inflatable support block, and a slider. The rotating shaft is mounted on the positioning groove via a connecting plate. The rotating shaft is rotatably mounted inside the slider. The inflatable support block is disposed on the rotating shaft and communicates with the vent hole. When the conveyor belt moves the clamping mechanism to the inflation chamber, the inflation chamber supplies air to the inflation support block through the air vent, causing it to expand and tighten the workpiece from the inner wall of the workpiece.

[0006] Furthermore, a column is provided between the slider and the connecting plate, and the two ends of the column are fixedly connected to the slider and the connecting plate respectively; The slider has an air passage that communicates with the inflatable support block.

[0007] Furthermore, a gear is fixed to the outer wall of the rotating shaft, and a groove extending along the length of the conveyor belt is provided on the top of the fixed frame. Racks are provided on both sides of the groove, and the gear meshes with the racks. When the conveyor belt moves, the gear rolls along the racks to drive the rotating shaft to rotate the workpiece.

[0008] Furthermore, the rotating shaft is configured as a split structure, including an upper clamping head and a lower connecting base, which are detachably connected by threads. The gear is disposed on the outer wall of the connecting base, and the inflatable support block is disposed on the clamping head.

[0009] Furthermore, the conveying mechanism also includes a drive motor and two transmission rollers, with the conveyor belt sleeved on the outside of the two transmission rollers, and the drive motor connected to one of the transmission rollers.

[0010] Furthermore, it also includes a paint spraying rack, which is fixedly connected to the upper part of the fixing frame.

[0011] Furthermore, the inflatable support block includes a rubber airbag and metal expansion plates distributed circumferentially along the airbag, and the air inlet end of the rubber airbag is connected to the airway.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: It adopts an internally inflatable support structure, which supplies air to the inflatable support block through the inflation chamber to make it expand, and achieves multi-point uniform support from the inner wall of the workpiece. This avoids direct contact between the fixture and the outer surface of the workpiece, completely eliminates the dead corners caused by external clamping, and ensures uniform painting of the entire outer surface of the workpiece without the need for subsequent touch-up painting, thereby improving production efficiency and coating integrity.

[0013] The integrated design of the conveying and clamping mechanisms, with the positioning groove and inflation chamber forming a dynamic seal, ensures stable air pressure and no leakage loss during inflation, guaranteeing reliable support force of the inflation support block. This enables simultaneous clamping, conveying, and rotating actions, significantly improving the efficiency of painting operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a hollow piston spraying clamping device according to an embodiment of the present invention; Figure 2 This is a top view schematic diagram of the hollow piston spraying clamping device according to an embodiment of the present utility model; Figure 3 for Figure 2Schematic diagram of the AA section along the middle edge; Figure 4 for Figure 3 Enlarged structural diagram at point I; Figure 5 for Figure 4 Schematic diagram of a split-type rotating shaft structure.

[0015] In the picture: 1. Fixing frame; 2. Clamping mechanism; 21. Rotating shaft; 211. Clamping head; 212. Connecting base; 22. Inflatable support block; 23. Gear; 24. Slider; 25. Column; 26. Connecting plate; 3. Spray painting frame; 4. Conveying mechanism; 41. Conveyor belt; 411. Vent hole; 42. Drive motor; 43. Transmission roller; 5. Inflation chamber; 6. Workpiece. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figures 1-5 As shown, in some embodiments, a clamping device for hollow piston spraying includes a fixing frame 1, a clamping mechanism 2, a conveying mechanism 4, and an inflation chamber 5. Specifically, the fixing frame 1 has a hollow structure, and the conveying mechanism 4 is installed in the internal space of the fixing frame 1. The conveying mechanism 4 includes a circulating conveyor belt 41, on which multiple positioning grooves are evenly distributed. Each positioning groove is provided with a vent hole 411 for gas flow.

[0019] The air chamber 5 is installed below the upper conveyor belt 41 and maintains a dynamic seal connection with the bottom of the conveyor belt 41 to ensure that the airtightness is not affected during movement.

[0020] The clamping mechanism 2 includes a rotating shaft 21, an inflatable support block 22, and a slider 24. The rotating shaft 21 is mounted on the positioning groove via a connecting plate 26, and is rotatably mounted on the slider 24. The inflatable support block 22 is disposed on the rotating shaft 21 and communicates with the vent hole 411.

[0021] Specifically, when the conveyor belt 41 carries the clamping mechanism 2 to the location of the inflation chamber 5, the compressed gas in the inflation chamber 5 enters the interior of the inflatable support block 22 through the vent 411, causing it to expand rapidly. This applies a uniform supporting force from the inner wall of the workpiece 6, achieving a stable clamping of the workpiece 6. Simultaneously, after the painting process is completed, the inflatable support block 22 moves out of the inflation chamber 5 along with the conveyor belt 41, automatically releasing its internal air pressure and rapidly contracting to detach from the workpiece 6. The entire clamping and releasing process requires no manual intervention, significantly improving automation and operational continuity.

[0022] This utility model adopts an internally inflatable support structure. Air is supplied to the inflatable support block 22 through the inflation chamber 5 to make it expand, and multi-point uniform support is achieved from the inner wall of the workpiece 6. This avoids direct contact between the clamp and the outer surface of the workpiece 6, completely eliminates the dead corners of missed spraying caused by external clamping, and ensures uniform painting of the entire outer surface of the workpiece 6 without the need for subsequent touch-up spraying, thereby improving production efficiency and coating integrity.

[0023] In addition, the conveying mechanism 4 and the clamping mechanism 2 are integrated into one design, and the positioning groove and the inflation chamber 5 form a dynamic seal to ensure stable air pressure and no leakage loss during inflation, ensuring reliable support force of the inflation support block 22. The clamping, conveying and rotating actions are carried out simultaneously to realize automated continuous operation and greatly improve the efficiency of painting.

[0024] Furthermore, in some embodiments, a column 25 is provided between the slider 24 and the connecting plate 26. The two ends of the column 25 are firmly fixedly connected to the upper surface of the slider 24 and the lower surface of the connecting plate 26 by welding, thereby ensuring the stability and load-bearing capacity of the overall structure.

[0025] Furthermore, the slider 24 is internally machined with air channels communicating with the inflatable support block 22. These air channels are arranged along the axial direction of the slider 24, effectively transmitting air pressure to drive the expansion and contraction of the inflatable support block 22, thereby achieving reliable clamping and release of the workpiece 6. Simultaneously, the rotating shaft 21 can rotate freely within the slider 24, allowing the workpiece 6 to rotate during transport. This facilitates uniform, all-around spraying of its outer surface by the painting equipment, effectively preventing localized paint buildup or missed areas caused by the workpiece 6 being stationary, and ensuring a uniform coating thickness.

[0026] Furthermore, in some embodiments, a gear 23 is fixedly connected to the outer wall of the rotating shaft 21, and a groove extending along the length of the conveyor belt 41 is provided on the top of the fixing frame 1. Racks are machined on both sides of the groove, and the racks are integrally formed with the groove to enhance structural stability. The gear 23 meshes with the racks on both sides, and this double-rack design provides a smoother transmission effect. When the conveyor belt 41 starts to move, the gear 23 rolls smoothly along the racks, thereby driving the rotating shaft 21 to rotate through meshing, ultimately causing the workpiece 6 to rotate uniformly, ensuring the uniformity and consistency of the painting process.

[0027] Furthermore, in some embodiments, the rotating shaft 21 adopts a split structure design, specifically including a clamping head 211 located at the upper part and a connecting base 212 located at the lower part. The two are detachably connected by threads. This connection method ensures both the convenience of assembly and the stability of the connection. The clamping head 211 and the inflatable support block 22 of the corresponding specifications can be quickly replaced according to the specific size of the workpiece 6, which greatly improves the versatility of the device and reduces the equipment replacement cost when producing products of multiple specifications.

[0028] Gear 23 is fixedly mounted on the outer wall of connecting base 212 to transmit rotational power; inflatable support block 22 is set on the upper clamping head 211, and achieves reliable clamping of the hollow piston through inflation. Its expansion force is evenly distributed on the inner wall of workpiece 6 to avoid clamping deformation. When the conveyor belt 41 moves, gear 23 rolls along the rack, driving the rotating shaft 21 to rotate synchronously, so that workpiece 6 rotates continuously at a uniform speed during the spraying process, ensuring consistent paint film thickness.

[0029] Furthermore, in some embodiments, the conveying mechanism 4 also includes a drive motor 42 and two parallel drive rollers 43; wherein the conveyor belt 41 is wrapped around the outer circumferential surface of the two drive rollers 43 to ensure smooth operation.

[0030] The drive motor 42 is connected to the output end of one of the transmission rollers 43 via a coupling, thus providing a continuous and adjustable power source for the entire conveyor belt 41 and realizing the automatic transfer function of the clamped workpiece 6. Simultaneously, the drive motor 42 can precisely adjust the running speed of the conveyor belt 41 according to the production cycle, ensuring that the spraying process and the conveying rhythm are synchronized. Both ends of the transmission roller 43 are fixed to the fixed frame 1 via bearing seats, ensuring its rotational accuracy and smooth operation. The two transmission rollers 43 are connected by the conveyor belt 41, ensuring that the conveyor belt 41 is evenly stressed on both sides during operation, effectively preventing deviation caused by uneven loading.

[0031] Furthermore, in some embodiments, a paint spraying frame 3 is also included. This frame 3 is fixedly installed on the upper part of the fixed frame 1, forming a stable connection structure with the fixed frame 1, ensuring more precise and efficient painting operations. This embodiment achieves integrated linkage of clamping, conveying, rotating, and painting, eliminating the need for manual intervention in clamping, fixing, and angle adjustment. This reduces manual operation steps, lowers human error, and simultaneously improves the safety and automation level of the production process. Furthermore, in some embodiments, the inflatable support block 22 includes a rubber air bladder and metal expansion plates distributed circumferentially along the air bladder. The rubber air bladder wraps around the outer wall of the rotating shaft 21 and communicates with the air passages inside the rotating shaft 21. When inflated, gas enters the rubber air bladder through the air passages, causing it to expand and push the metal expansion plates to expand radially outward, thereby tightly fitting the inner wall of the workpiece 6 and achieving a firm clamping.

[0032] The inflatable support block 22 adopts a combination structure of rubber air bladder and metal expansion plate. The rubber air bladder has good elastic cushioning performance, which avoids the rigid support from scratching or deforming the inner wall of the piston, while the metal expansion plate enhances the support strength and stability. The specific workflow of this utility model is as follows: Changeover preparation: Select the corresponding clamping head 211 according to the inner diameter of workpiece 6, and connect it to the connecting base 212 via threads.

[0033] Loading: The workpiece 6 is manually placed onto the inflatable support block 22.

[0034] Conveying: The drive motor 42 drives the conveyor belt 41 to move. When the clamping mechanism 2 enters the range of the inflation chamber 5, the bottom of the conveyor belt 41 contacts the lip seal of the inflation chamber 5 to form a dynamic seal.

[0035] Inflatable clamping: The vent 411 is connected to the inflation chamber 5. Compressed air enters the rubber airbag through the air passage. The airbag expands and pushes the aluminum alloy expansion plate to tighten the inner wall of the workpiece 6.

[0036] Synchronous rotary painting: Gear 23 rolls along the rack, causing workpiece 6 to rotate. After entering the paint spraying frame 3, the spray head turns on to spray paint on the surface of the rotating workpiece 6.

[0037] Material unloading: After the workpiece 6 is painted and dried, it leaves the inflation chamber 5, the air bag is deflated, the expansion plate is reset, and the painted workpiece 6 is manually removed, completing one cycle.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A clamping device for hollow piston spray painting, characterized in that, It includes a fixing frame (1), a clamping mechanism (2), a conveying mechanism (4), and an inflation chamber (5); The conveying mechanism (4) is located inside the fixed frame (1). The conveying mechanism (4) includes a conveyor belt (41). The conveyor belt (41) is provided with a plurality of positioning grooves with ventilation holes (411). The air chamber (5) is located at the bottom of the upper conveyor belt (41) and forms a dynamic seal with the bottom of the conveyor belt (41). The clamping mechanism (2) includes a rotating shaft (21), an inflatable support block (22), and a slider (24). The rotating shaft (21) is installed in the positioning groove through a connecting plate (26). The rotating shaft (21) is rotatably installed in the slider (24). The inflatable support block (22) is disposed on the rotating shaft (21) and communicates with the vent (411). When the conveyor belt (41) drives the clamping mechanism (2) to move to the inflation chamber (5), the inflation chamber (5) supplies air to the inflation support block (22) through the air vent (411) to make it expand and support the workpiece (6) tightly from the inner wall of the workpiece (6).

2. The clamping device for hollow piston painting according to claim 1, characterized in that, A column (25) is provided between the slider (24) and the connecting plate (26), and the two ends of the column (25) are fixedly connected to the slider (24) and the connecting plate (26) respectively; The slider (24) has an air passage that communicates with the inflatable support block (22).

3. The clamping device for hollow piston painting according to claim 1, characterized in that, The outer wall of the rotating shaft (21) is fixed with a gear (23). The top of the fixed frame (1) is provided with a groove extending along the length of the conveyor belt (41). The sides of the groove are provided with racks. The gear (23) meshes with the rack. When the conveyor belt (41) moves, the gear (23) rolls along the rack to drive the rotating shaft (21) to rotate the workpiece (6).

4. The clamping device for hollow piston painting according to claim 3, characterized in that, The rotating shaft (21) is configured as a split structure, including an upper clamping head (211) and a lower connecting base (212), which are detachably connected by threads. The gear (23) is disposed on the outer wall of the connecting base (212), and the inflatable support block (22) is disposed on the clamping head (211).

5. The clamping device for hollow piston painting according to claim 1, characterized in that, The conveying mechanism (4) also includes a drive motor (42) and two transmission rollers (43). The conveyor belt (41) is sleeved on the outside of the two transmission rollers (43), and the drive motor (42) is connected to one of the transmission rollers (43).

6. The clamping device for hollow piston painting according to claim 1, characterized in that, It also includes a paint spraying frame (3), which is fixedly connected to the upper part of the fixing frame (1).

7. The clamping device for hollow piston painting according to claim 2, characterized in that: The inflatable support block (22) includes a rubber airbag and a metal expansion piece distributed circumferentially along the airbag, and the air inlet end of the rubber airbag is connected to the airway.

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