Reciprocating swing nail feeding mechanism for fastener conveying equipment

Abstract

A reciprocating swing type nail feeding mechanism for fastener conveying equipment comprises a double-row swing rod and a nail grabbing member, wherein the double-row swing rod is composed of a first swing rod and a second swing rod which are arranged in parallel at a certain distance. Two nail grabbing members are installed at each end of the double-row swing rod, and the nail grabbing members on the same side are elastically closed and distributed in a "V" shape through an elastic component. Through the swing of the double-row swing rod, the nail grabbing heads on the nail grabbing members on both sides can grab fasteners from the far end in turn and swing and convey them to the welding electrode, so as to stably and continuously convey fasteners for the welding equipment.

Description

Technical Field

[0001] The invention belongs to the field of welding equipment, and in particular relates to a reciprocating swing nail feeding mechanism for fastener conveying equipment. Background Art

[0002] In the field of industrial manufacturing, especially in the field of automobile manufacturing, a large number of parts involve welding steps. At present, one of the conventional methods for connecting parts to each other in this field is spot welding, which is a more traditional connection method. However, when it comes to the connection of workpieces of dissimilar materials, such as the connection between aluminum workpieces and steel workpieces, welding methods (such as spot welding) are difficult to achieve reliable connection. This requires the use of rivets for fastening. For example, fastening technologies such as self-piercing riveting, hot melt tapping and resistance plug riveting are widely used. However, in actual operation, these technologies all rely on fastener (rivet) feeding systems to achieve accurate delivery and installation of fasteners. However, the existing fastener delivery systems face many challenges in terms of efficiency, accuracy and stability during delivery, as well as the equipment to accurately weld fasteners to workpieces.

[0003] Patent documents CN 111182995 A and CN 113165100 A respectively disclose a jacket assembly and a rivet (herein referred to as fastener) distribution system for a fastener feeding device, wherein the fastener is delivered to the side of the jacket assembly of the fastener feeding device through the rivet (fastener) distribution system, and the jacket assembly then grabs the fastener as an electrode for welding. The device has a complex design, and the connection and movement path between the components and component elements in the device system involve multiple driver connections, resulting in very complex mechanism control.

[0004] Patent document CN217316356U discloses a swing type sheet conveying device, which uses a single-sided swing rod, has the problems of poor structural rigidity and centering errors of fasteners and electrodes. In addition, the feeder mounted on the swing rod is difficult to firmly grasp the fasteners and quickly release the fasteners during welding, making it difficult to avoid interference with the electrode pressing down and welding process.

[0005] Patent document CN118720380A discloses a fastener grabbing mechanism that uses a connecting rod mechanism to connect two pieces of spliced ​​chucks. The mechanism can realize the grabbing and releasing of fasteners and avoid the welding process of electrodes. However, the fastener conveying and positioning process of the device involves the coordinated control of the fastener transfer mechanism and the positioning clamping mechanism. The movement of the positioning mechanism, the release of rivets and the avoidance of the welding process require the design of a complex motion trajectory and a large number of sensors for coordinated control, which is difficult to control and inefficient. In addition, the mechanism is relatively bloated, occupies a large space, and is prone to interference with surrounding parts.

[0006] Patent document CN113275726A discloses a device for supplying side-mounted components (referred to herein as fasteners). The device is provided with a relatively long telescopic rod (linear drive) to deliver fasteners to the welding electrode punch. During welding, the component supply device extracts the fasteners from the supply unit and then extends it to the electrode punch. After the electrode punch squeezes the rivet, the component clamp releases the fastener, and the component supply device retracts to the initial position. The control of the drive unit, mechanism movement, and sensor signal coordination required for this device is relatively complex. In addition, the device occupies a relatively large space, and the outer contour of the device interferes with the parts to be welded, which makes it difficult for the component supply device to quickly avoid the welding process during welding. In addition, there are tolerances in the alignment process between the supply unit and the supply device, which will lead to difficulties in the secondary transfer of fasteners and the alignment of fasteners with the welding electrode.

[0007] Therefore, there is a need in the art for a fastener conveying mechanism that has a simple structure and movement mode, is easy to control, and has high stability, so as to achieve a stable and efficient conveying effect of fasteners during welding. Summary of the invention

[0008] In order to achieve the above technical effects, the present invention provides a reciprocating swing nail feeding mechanism for a fastener conveying device, and the specific invention contents are as follows:

[0009] A reciprocating swing nail feeding mechanism for fastener conveying equipment, characterized in that it comprises: a double-row swing rod, which is composed of a first swing rod and a second swing rod arranged in parallel at a certain distance; a bearing mounting seat is symmetrically arranged at the center of the first swing rod and the second swing rod, and the two ends of the mounting shaft are embedded to support the double-row swing rod to rotate around the mounting shaft; an axis hole is arranged at the outer position of the bearing mounting seat of any swing rod, and the axis hole is connected to the rotating shaft of the rotating driver; U-shaped mounting seats and springs are symmetrically arranged at both ends of the first swing rod and the second swing rod. A mounting seat; a nail grabbing component, consisting of a handle and a nail grabbing head, wherein the handle is movably mounted in the U-shaped mounting seat, and the end of the handle is connected to the spring mounting seat through a third elastic component, driving the nail grabbing head to close to the neutral plane between the two parallel rocker arms, so that after the two nail grabbing heads on the same side are closed, the nail grabbing component on this side presents a "V" shape, forming a rivet accommodating cavity for accommodating rivets; a rotary driver, used to drive the shaft hole to rotate, thereby driving the double-row rocker arms to swing back and forth, so that the nail grabbing component switches alternately between the electrode position and the nail ejection nozzle position.

[0010] Furthermore, the first swing rod and the second swing rod are distributed in an obtuse angle α shape with the center portion as the vertex.

[0011] Preferably, the obtuse angle α ranges from 120° to 150°.

[0012] Furthermore, the double-row swing rod is provided with a transverse connecting portion, and two ends of the transverse connecting portion are respectively connected to the first swing rod and the second swing rod, so that the first swing rod and the second swing rod are connected as a whole.

[0013] Furthermore, the transverse connecting portion is a detachable detachable structure or an integrated structure, and is detachably connected to the first swing arm and the second swing arm through bolts or buckles.

[0014] Furthermore, the third elastic component is a compression spring or a torsion spring, which is used to drive the nail grabbing head to return to the closed state after the external force is removed.

[0015] Furthermore, a bearing is embedded in the bearing mounting seat, and the mounting shaft is fixed to the fastener conveying device.

[0016] Furthermore, a third limiting portion is provided at the end of the swing rod of the double-row swing rod, and a fourth limiting portion is provided at the handle of the nail grabbing component. When the fourth limiting portion and the third limiting portion are in contact with each other, the end position of each closing of the two nail grabbing heads can be fixed, ensuring that the rivet grabbed by the nail grabbing head each time can be aligned with the electrode axis.

[0017] Furthermore, when the nail grabbing head is closed, the minimum gap h1 between the nail grabbing head and the end of the electrode satisfies: 2mm≤h1≤5mm.

[0018] Furthermore, the maximum rotation angle A of the rotary driver and the maximum rotation angle B of the double-row swing arm satisfy the relationship: A≥1.2×B.

[0019] Preferably, the rotary drive is a cylinder type rotary drive.

[0020] Furthermore, the shape of the rivet accommodating cavity matches the outer contour of the rivet, so as to prevent the rivet in the rivet accommodating cavity from jumping or falling over during the swinging process of the double-row swinging rod.

[0021] Furthermore, the certain distance is greater than 1.5 times the diameter of the electrode body.

[0022] Beneficial effects of the present invention:

[0023] (1) The double-row swing arm consists of two swing arms, which are connected as a whole through a transverse connection. The bearing mounting seat is symmetrically arranged at the center of the swing arm, and is fixed to the main support of the equipment through the mounting shaft to form a stable rotation fulcrum. The parallel layout and transverse connection design of the double-row swing arm can enhance the overall rigidity of the mechanism and avoid deformation or vibration of the single swing arm due to uneven force. The end of the swing arm is installed with a gripping nail component, which can clamp the fastener it grabs with the mechanical clamping force after closing to prevent the fastener from falling off and flipping, etc. At the same time, the rivet and the electrode have strong alignment, ensuring the stability of the welding quality of the fastener it conveys. The synchronous swing of the double swing arm ensures the trajectory consistency of the gripping nail component during the conveying process and reduces the position deviation when the rivet is grabbed and released.

[0024] (2) The reciprocating swing motion trajectory is simple and easy to control. The starting and ending positions of the double-row swing rod are used to transfer fasteners. The position is determined, which is easy to monitor the control sensor signal of the structural movement. The redundant design of the driver angle ensures that the swing rod swings completely to the preset end position, avoiding the problem of insufficient stroke caused by mechanical clearance. The minimum gap design between the rivet head and the electrode ensures that the rivet is accurately delivered to the bottom of the electrode and avoids the collision between the rivet gripper and the electrode, thereby achieving rapid avoidance and continuous operation during the welding process. The two pieces of the rivet gripper can not only open smoothly under the pressure of the electrode to release the fastener, but also avoid the welding process.

[0025] (3) The structure of the mechanism of the present invention is exquisite and simple, the manufacturing cost is low, and the quality of parts is easy to control; at the same time, the parts are easy to process and install, and the replacement and maintenance of parts are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a double-row swing rod structure, in which A is an integral type and B is a split type;

[0027] Figure 2 It is a structural diagram of a double-row swing rod;

[0028] Figure 3 It is a cross-sectional view after the double-row swing arm and the rotary drive are installed;

[0029] Figure 4 A in the middle is an assembly drawing of the double-row swing rods and the nail grabbing components;

[0030] Figure 4 Middle B is a schematic diagram of two nail grabbing components after being assembled;

[0031] Figure 5 A in the middle is the fastener conveying equipment;

[0032] Figure 5 B in the middle is the installation detail drawing of the nail grabbing component;

[0033] Figure 5Center C is a cross-sectional view of the nail grabbing component after installation. DETAILED DESCRIPTION

[0034] The device of the present invention is described in detail below through specific implementation schemes and in conjunction with the accompanying drawings to further understand the gist of the present invention.

[0035] See also Figure 1 and Figure 2 The double-row swing arm 700 is composed of two first swing arms 701 and second swing arms 702 arranged in parallel at a certain distance, and the first and second swing arms are distributed at an obtuse angle α with the rotation center as the vertex. According to the operating characteristics of the double-row swing arm, on the opposite side of the obtuse angle α ( Figure 2 In the upper part of the figure, a transverse connecting part 708 is provided to connect the first and second swing rods so that the two swing rods are connected into one body. Figure 1 As shown, according to different structural design requirements, the lateral connection portion 708 of the double-row swing rod can be designed as an integrated type ( Figure 1 A) or a split structure ( Figure 1 Middle B).

[0036] See also Figure 2 , bearing mounting seats 703 are symmetrically arranged at the rotation center of the two swing rods. An axial hole 704 extends outward from the bearing mounting seat 703 of the first swing rod 701 for matching and mounting with the rotating shaft of the rotary driver. An end U-shaped mounting seat 706, a spring mounting seat 707 and a third limiting portion 705 are arranged at the end of any swing rod.

[0037] See also Figure 3 When the double-row swinging rod 700 is mounted on the second sliding bracket 600, a bearing 606 is mounted on the mounting shaft 605, and the bearing mounting seat 703 of the double-row swinging rod 700 is sleeved outside the bearing 606, so that the double-row swinging rod 700 can smoothly rotate around the shaft. The rotation driver 202 is mounted on the driver mounting seat 604, so that its rotation driving shaft is coaxially mounted with the shaft hole 704 of the double-row swinging rod 700, providing a rotation driving force for the double-row swinging rod.

[0038] Two gripping nail members 800 are installed at one end of the double-row swing rod 700 (different numbers are used here to distinguish the four gripping nails). The two gripping nail members at the same end are marked as the first gripping nail member 800a and the second gripping nail member 800b, and the two gripping nail members at the other end are marked as the third gripping nail member 800c and the fourth gripping nail member 800d. The four gripping nail members described here have the same structure except that the position of the fourth limiter 802 is different. In addition, due to the symmetrical installation characteristics of the gripping nail members, the structures of the first and third gripping nail members are exactly the same, and the structures of the second and fourth gripping nail members are exactly the same. See Figure 4 Middle B, Figure 5Medium B and Figure 5 In the middle C, the nail grasping member 800 includes a handle 801 and a nail grasping head 803 extending from the handle. When installed, the handle 801 is rotatably mounted on the U-shaped mounting seat 706 at the end of the first or second swing rod ( Figure 4 A). The third elastic component 207 is installed between the end of the handle of the grasping nail member and the swing rod, driving the grasping nail head of the grasping nail member to swing toward the neutral plane between the double-row swing rods, so that the two grasping nail heads on the same side are closed, so that the two grasping nail members are arranged in a "V" shape, and then can be distributed across the two sides of the electrode 102 with the swing of the double-row swing rods ( Figure 5 The fourth limiting portion 802 on the handle of the nail grasping member fits with the third limiting portion 705 on the double-row swinging rod (see Figure 5 In the middle B), it is used to fix the end position of each closing of the two nail grabbing heads, ensuring that the rivet grabbed by the nail grabbing heads can be aligned with the axis of the electrode 102 each time. When the closed nail grabbing heads are opened under the action of external force, the third elastic component stores elastic energy. After the external force is removed, the third elastic component releases the elastic energy and drives the nail grabbing heads to return to the closed state. After the two nail grabbing heads are closed, a rivet accommodating cavity 804 is formed to accommodate the rivet 900 ( Figure 5 Middle C).

[0039] See also Figure 5 In Figure A, the rotary driver 202 drives the double-row swing arm 700 to rotate back and forth, so that the first and second nail-grabbing members 800a and 800b (not marked) at one end of the double-row swing arm switch back and forth between the position of the electrode 102 directly below and the position of the nail-spitting nozzle 502 on the right side, and the third and fourth nail-grabbing members 800c and 800d (not marked) at the other end switch back and forth between the position of the nail-spitting nozzle on the left side and the position of the electrode directly below. In one embodiment, the rotary driver is a pneumatic rotary driver, and the maximum rotation angle A of its shaft is related to the maximum rotation angle B of the double-row swing arm: A ≥ 1.2 × B. Setting the rotation angles of the two in this way can ensure that the double-row swing arm can fully swing to the final positions set at both ends. Figure 5 Medium B and Figure 5 As shown in C, in order to ensure that the nail grabber 803 can be completely screwed into the electrode 102 from the side to the bottom of the electrode, a minimum gap is set between the end of the electrode 102 and the nail grabber to meet the range of 2mm≤h1≤5mm.

Claims

1. A reciprocating swing nail feeding mechanism for fastener conveying equipment, characterized in that: include: The double-row swing rod (700) is composed of a first swing rod (701) and a second swing rod (702) which are arranged in parallel at a certain interval; bearing mounting seats (703) are symmetrically arranged at the central parts of the first swing rod (701) and the second swing rod (702) and face each other; the bearing mounting seats (703) are embedded with bearings (606) and are fixed to the main support of the fastener conveying device through a mounting shaft (605), so that the double-row swing rod (700) rotates around the mounting shaft (605); an axis hole (704) is arranged on the outer side of the bearing mounting seat (703) of the first swing rod (701) or the second swing rod (702) for connecting to the rotating shaft of the rotating driver (202); U-shaped mounting seats (706) and spring mounting seats (707) are symmetrically arranged at both ends of the first swing rod (701) and the second swing rod (702); The nail grabbing member (800) is composed of a handle (801) and a nail grabbing head (803), wherein the handle (801) is movably mounted in the U-shaped mounting seat (706), and the end of the handle (801) is connected to the spring mounting seat (707) via a third elastic component (207), and the elastic force of the third elastic component (207) drives the two nail grabbing heads (803) on the same side to close to the neutral plane between the two parallel swing rods, thereby forming a "V"-shaped rivet accommodating cavity (804) for accommodating the rivet (900); The rotary driver (202) is used to drive the shaft hole (704) to rotate, thereby driving the double-row swing rods (700) to swing back and forth, so that the nail grabbing member (800) switches alternately between the electrode (102) position and the nail ejecting nozzle (502) position.

2. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to claim 1, characterized in that: The first swing rod (701) and the second swing rod (702) are distributed in an obtuse angle α shape with the central portion as the vertex, and 120°≤α≤150°.

3. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to claim 1, characterized in that: The double-row swing rod is provided with a transverse connecting portion (708), and the two ends of the transverse connecting portion are respectively connected to the first swing rod (701) and the second swing rod (702), so that the first swing rod (701) and the second swing rod (702) are connected as one body.

4. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to claim 3, characterized in that: The transverse connection portion is a detachable, split structure, detachably connected to the first swing arm (701) and the second swing arm (702) via bolts or buckles, or is an integrated structure.

5. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to claim 1, characterized in that: The third elastic component (207) is a compression spring or a torsion spring, and is used to drive the nail grabbing head (803) to return to a closed state after the external force is removed.

6. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to any one of claims 1 to 5, characterized in that: The ends of the first swing rod (701) and the second swing rod (702) are both provided with a third limiting portion (705), and the handle (801) of the nail grabbing member (800) is provided with a fourth limiting portion (802). When the fourth limiting portion (802) and the third limiting portion (705) are in contact with each other, the closing end position of the two nail grabbing heads is limited, thereby ensuring that the rivet grabbed by the nail grabbing head each time is aligned with the axis of the electrode (102).

7. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to claim 6, characterized in that: When the nail grabbing head (803) is closed, the minimum gap h1 between the nail grabbing head (803) and the end of the electrode (102) satisfies the following: 2 mm ≤ h1 ≤ 5 mm.

8. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to claim 1, characterized in that: The maximum rotation angle A of the rotation driver (202) and the maximum rotation angle B of the double-row swing arm (700) satisfy the relationship: A≥1.2×B.

9. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to any one of claims 1-5 or 7-8, characterized in that: The shape of the rivet accommodating cavity (804) matches the outer contour of the rivet (900) and is used to prevent the rivet in the rivet accommodating cavity from jumping or tipping over during the swinging process of the double-row swinging rod.

10. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to any one of claims 1-5 or 7-8, characterized in that: The rotary drive (202) is a pneumatic or electric rotary drive.

11. The reciprocating swing nail feeding mechanism for fastener feeding equipment according to any one of claims 1-5 or 7-8, characterized in that: The certain distance is greater than 1.5 times of the body diameter of the electrode.

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