Switchable vehicle active hand pin mechanism for welding line body

Abstract

The utility model belongs to the technical field of clamp, concretely relates to a kind of switchable car type movable hand wear pin mechanism for welding line body, including bottom plate, cylinder and manual extension pin assembly, the cylinder is fixed on bottom plate, its piston rod connects cylinder fixed end connecting block, the outside of cylinder fixed end connecting block is fixed with cylinder movable end connecting block;The manual extension pin assembly includes: shaft sleeve, is fixed on cylinder movable end connecting block, and the bottom is equipped with the cross-shaped clamping groove of shallow alternation;Positioning pin, sliding fit in the inside of shaft sleeve, inside is equipped with the structure of reducing diameter;Clamp block, through positioning pin and cooperate with cross-shaped clamping groove;Spring, between the structure of reducing diameter of positioning pin and shaft sleeve, is sleeved.Setting.

Description

Technical Field

[0001] This utility model belongs to the field of fixture technology, specifically relating to a switchable model movable hand pin mechanism for welding lines. Background Technology

[0002] In the fixture positioning technology of automotive body welding production lines, traditional positioning pins have a significant drawback: they are difficult to align precisely with guide holes when manually inserted, resulting in severely low assembly efficiency. For example, at a door hinge installation station of a Japanese automaker, operators need to insert an 8mm positioning pin into the guide hole of the side panel of the vehicle body within a 3-second cycle. Due to blind spots, the first-time alignment success rate is only 62% (2019 production data). Each failed insertion requires 6 seconds of readjustment, resulting in a cumulative loss of 47 minutes of effective working time per station per day. More seriously, a positioning deviation exceeding 0.5mm can cause welding deformation, increasing annual rework costs by 2.8 million yuan. Frequent adjustments can also cause the fixture base plate to wear up to 0.15mm / year, exceeding the design standard by 3 times.

[0003] In addition, conventional flexible pin structures are prone to loosening under vibration conditions. For example, if the flexible pin coupling is poorly installed or the friction is aggravated, the vibration will be significantly enhanced. Insufficient axial restoring force or missing thrust bearing will cause axial movement, eventually leading to loosening. At the same time, existing devices generally lack overload protection mechanisms, and equipment damage is very easy to occur when operating incorrectly. These problems seriously restrict the automated production efficiency and equipment reliability of the welding line. Utility Model Content

[0004] The purpose of this invention is to provide a switchable vehicle model movable hand pin mechanism for welding lines to solve the problems existing in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a switchable vehicle model movable hand pin insertion mechanism for welding lines, comprising a base plate, a cylinder, and a manual pin extension assembly.

[0006] The cylinder is fixed on the base plate, and its piston rod is connected to the cylinder fixed end connecting block. The cylinder movable end connecting block is fixed on the outside of the cylinder fixed end connecting block.

[0007] The manual extension pin assembly includes:

[0008] The bushing is fixed to the connecting block of the moving end of the cylinder, and the bottom is provided with a cross groove with alternating depths;

[0009] The locating pin slides inside the bushing and has an internal diameter reduction structure.

[0010] The locking block passes through the locating pin and engages with the cross-shaped locking slot.

[0011] A spring is fitted between the reduced-diameter structure of the locating pin and the bushing.

[0012] The cylinder fixed end connecting block is provided with a buffer mechanism on the outside, which includes a first buffer block, a second buffer block and a buffer block connecting plate. The first buffer block is fixed to the cylinder fixed end connecting block, and the second buffer block is connected to the base plate through the buffer block connecting plate.

[0013] Preferably, the depth difference between the deep and shallow grooves of the cross groove is 1 / 2 to 2 / 3 of the travel of the locating pin, with the deep groove corresponding to the extended pin state and the shallow groove corresponding to the retracted pin state.

[0014] Preferably, in the buffer mechanism, the first buffer block and the second buffer block are made of polyurethane material, and their contact surface has a wedge-shaped structure.

[0015] Preferably, the end of the positioning pin is provided with a tapered guide head with a tapered angle of 15°-30°.

[0016] The beneficial effects of this utility model are as follows: This technical solution, through the coordinated design of the hand-pin structure and the cylinder, can achieve rapid switching of hand-pin positioning for multiple vehicle models. When it is necessary to adapt to different vehicle models, simply adjust the cylinder stroke and connection direction to change the extension position and length of the positioning pin, meeting the positioning requirements of different vehicle body structures. This effectively solves the limitation of traditional devices that can only position a single vehicle model, significantly improving the vehicle model adaptability flexibility of the welding line.

[0017] Meanwhile, this mechanism utilizes the cross-shaped slot at the bottom of the bushing and the locking block, combined with a spring structure, to achieve automatic guidance and correction, significantly improving alignment accuracy during manual pin insertion. In practical applications, it reduces the number of insertion failures caused by blind spots, lowers the risk of welding deformation due to positioning deviations, improves assembly efficiency, and absorbs vibration impact through the buffer block structure, reducing wear on the fixture base plate and lowering equipment repair costs and maintenance wear. Attached Figure Description

[0018] Figure 1 This is an isometric schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a partial cross-sectional view of the present invention. Detailed Implementation

[0020] In the description of this disclosure, it should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0023] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0024] like Figure 1 As shown, a switchable vehicle model movable hand pin mechanism for a welding line comprises a cylinder 1, a cylinder movable end connecting block 2, a cylinder fixed end connecting block 3, a manual extension pin 4, a first buffer block 5, a second buffer block 6, a buffer block connecting plate 7, and a base plate 8. The cylinder 1 is fixed to the base plate 8, and its piston rod is connected to the cylinder fixed end connecting block 3. The cylinder movable end connecting block 2 is fixed to the outside of the cylinder fixed end connecting block 3.

[0025] The first buffer block 5 is fixed on the cylinder fixed end connecting block 3 and cooperates with the second buffer block 6. The second buffer block 6 is fixed on one end of the buffer block connecting plate 7, and the other end of the buffer block connecting plate 7 is fixed on the base plate 8.

[0026] The manual extension pin 4 is fixed to one end of the cylinder movable end connecting block 2, and includes a locating pin 41, a bushing 42, a spring 43, and a retaining block 44. The bottom of the bushing 42 has a cross-shaped groove 45 with varying depths, and the retaining block 44 passes through the locating pin 41 and engages with the cross-shaped groove 45. The bushing 42 is fixed to the cylinder movable end connecting block 2, and the locating pin 41 slides within the bushing 42. The internal diameter of the locating pin 41 is reduced to accommodate the spring 43, which is fitted between the locating pin 41 and the bushing 42.

[0027] The principle of the locating pin extension: When the manual extension pin 4 is held, the locating pin 41 is rotated 90 degrees, causing the locking block 44 to move from the shallow groove position to the deep groove position in the cross groove 45 at the bottom of the bushing 42. At this time, the handle is released, and the locating pin 41 extends under the action of the spring 43, completing the extension action and realizing the positioning of the body part. When the pin is retracted, the handle is held again and rotated 90 degrees, causing the locking block 44 to move from the deep groove back to the shallow groove, the spring 43 is compressed, and the locating pin 41 is retracted.

[0028] Vehicle model switching principle: Based on the positioning requirements of different vehicle models in actual production, the stroke of cylinder 1 is adjusted to change the extension length and position of positioning pin 41; at the same time, the connection direction of cylinder 1 is adjusted so that the positioning position of positioning pin 41 adapts to the body structure of different vehicle models, thereby realizing rapid positioning switching between two vehicle models in various relative positions.

[0029] Buffer protection principle: During the operation of the mechanism, the first buffer block 5 and the second buffer block 6 cooperate with each other to absorb the impact force generated when the cylinder 1 moves, reduce vibration, and avoid problems such as positioning deviation and loosening of parts caused by impact and vibration. At the same time, it can also play an overload protection role for the mechanism and extend the service life of the equipment.

[0030] It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A switchable vehicle model movable hand pin threading mechanism for welding lines, characterized in that: It includes a base plate (8), a cylinder (1), and a manual extension pin assembly (4). The cylinder (1) is fixed on the base plate (8), and its piston rod is connected to the cylinder fixed end connecting block (3). The cylinder movable end connecting block (2) is fixed on the outside of the cylinder fixed end connecting block (3). The manual extension pin assembly (4) includes: The bushing (42) is fixed on the cylinder moving end connecting block (2), and the bottom is provided with a cross groove (45) with alternating depths; The locating pin (41) is slidably fitted inside the bushing (42) and has a reduced diameter structure inside; The locking block (44) passes through the positioning pin (41) and engages with the cross-shaped locking groove (45); Spring (43) is sleeved between the reduced diameter structure of the locating pin (41) and the bushing (42); The cylinder fixed end connecting block (3) is provided with a buffer mechanism on the outside, including a first buffer block (5), a second buffer block (6) and a buffer block connecting plate (7). The first buffer block (5) is fixed to the cylinder fixed end connecting block (3), and the second buffer block (6) is connected to the base plate (8) through the buffer block connecting plate (7).

2. The pin-feeding mechanism according to claim 1, characterized in that: The difference in depth between the deep and shallow grooves of the cross groove (45) is 1 / 2 to 2 / 3 of the travel of the locating pin. The deep groove corresponds to the extended pin state, and the shallow groove corresponds to the retracted pin state.

3. The pin-feeding mechanism according to claim 1, characterized in that: In the buffer mechanism, the first buffer block (5) and the second buffer block (6) are made of polyurethane material, and their contact surface is a wedge-shaped structure.

4. The pin-feeding mechanism according to claim 1, characterized in that: The end of the positioning pin (41) is provided with a tapered guide head with a tapered angle of 15°-30°.

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