Elastic collet type bolt clamping mechanism

Abstract

The utility model provides an elastic collet type bolt clamping mechanism which comprises a base, a plurality of outer sleeves are installed at the upper end of the base in an embedded mode, fixed plates are fixedly installed inside the upper end of the base, and a movable plate is connected between the fixed plates in a threaded sliding mode. According to the elastic collet type bolt clamping mechanism, the fixed plate, the motor, the bearing, the double-thread screw, the movable plate, the extrusion plate and other structures are arranged, the fixed plate provides stable mounting sites for the motor, the bearing and related parts, the motor serves as a power source and is smoothly connected with the double-thread screw through the bearing, the double-thread screw is driven to rotate after starting, and the elastic collet type bolt clamping mechanism is used for clamping bolts. The double-thread screw is in threaded fit with the movable plate, the movable plate is limited by the containing hole sliding groove, rotation motion is converted into transverse linear motion of the movable plate, and force transmitted by the movable plate is evenly applied to the outer sleeve by means of the mode that an extrusion plate on the movable plate is movably connected with the bottom of the outer sleeve through the arc-shaped design of the extrusion plate. And the outer sleeve is promoted to cooperate with the inner sleeve to tightly and uniformly clamp the bolt.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt pickup equipment technical field more specifically, relate to a kind of elastic collet formula bolt clamping mechanism. BACKGROUND

[0002] Bolt is the most widely used fastener in mechanical products, widely used in automotive, aviation, electronics, automation machinery and other product components. In today's automotive, electronic industry product assembly production line, the automatic installation of bolt on product generally relies on nail feeder feeding, and the bolt is installed and tightened on the product component after being taken by screwing gun sleeve.

[0003] However, the existing bolt clamping mechanism has the following problems when in use:

[0004] During the process of picking up the bolt discharged by the nail feeder by the screwing gun sleeve pressing and rotating the cap, the clamping force of the clamping device is uneven, and the bolt may not be picked up during the picking process due to the rotation of the sleeve, resulting in low efficiency and success rate of the cap recognition and bolt picking process, and the uneven stress on the bolt may also cause loosening or damage.

[0005] The utility model can achieve accurate and stable clamping of the bolt, the motor-driven double-end screw rod drives the moving plate and the extrusion plate, the arc-shaped extrusion plate uniformly applies force to the outer sleeve, the inner and outer sleeves tightly embrace the bolt, effectively avoiding the loosening displacement of the bolt, and due to the movable connection between the extrusion plate and the outer sleeve and the uniform force application, the risk of hard collision, friction and stress concentration is reduced, the wear risk is reduced, and the bolt clamping and loosening cycle is quickly completed. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the technical problems in the above background art, and provides an elastic collet formula bolt clamping mechanism.

[0007] To achieve the above object, the utility model provides the following technical scheme: an elastic collet formula bolt clamping mechanism, comprising: a base, a plurality of outer sleeves are embedded and installed on the upper end of the base, a fixed plate is fixedly installed inside the upper end of the base, a moving plate is threadedly connected between the fixed plates, a plurality of accommodating holes are formed in the upper end of the base, the outer sleeves are embedded in the accommodating holes, fixed plates are fixedly installed on the outer end surface of the bottom of the accommodating hole, and a sliding groove is formed in the bottom of the accommodating hole and slidably connected with the moving plate, a double-end screw rod is rotatably connected between the fixed plates, and the double-end screw rod is threadedly connected with the moving plate.

[0008] Further preferred scheme: a connecting column is fixedly installed on the middle of the upper end of the base, a top plate is fixedly connected to the upper end of the connecting column, a plurality of through holes are formed in the upper end of the top plate, the number of through holes is consistent with the number of accommodating holes, and the outer sleeves pass through the through holes and are embedded in the accommodating holes.

[0009] Further preferred: the outer sleeve upper end is provided with an embedded hole, the inner sleeve is embedded and installed in the embedded hole, and the inner sleeve upper end is provided with a placing hole.

[0010] Further preferred: the fixed plate outer end face is fixedly installed with a motor, the fixed plate is fixedly installed with a bearing, the bearing is rotationally connected with both ends of the double-headed screw rod, and one end of the double-headed screw rod is fixedly connected with the output end of the motor through the bearing.

[0011] Further preferred: the moving plate is provided with a threaded hole, the threaded hole is threadedly connected with the double-headed screw rod, the moving plate inner side face upper end is fixedly installed with a connecting block, and the connecting block inner side face is fixedly installed with an extrusion plate.

[0012] Further preferred: the extrusion plate is arc-shaped and movably connected with the outer sleeve bottom outer side face.

[0013] Beneficial effects:

[0014] 1. By setting the fixed plate, motor, bearing, double-headed screw rod and moving plate, the fixed plate provides stable support for the entire structure, the motor is connected with the double-headed screw rod through the bearing, and the motor drives the double-headed screw rod to rotate when operating. Since the double-headed screw rod is threadedly connected with the moving plate, the moving plate can only translate linearly under the restriction of the containing hole bottom sliding groove, so that the double-headed screw rod rotationally moves the moving plate transversely to drive the subsequent clamping mechanism to act, realizing the clamping and loosening operation of the bolt, and improving the operation convenience and precision;

[0015] 2. By setting the extrusion plate, the extrusion plate is arc-shaped and movably connected with the outer sleeve bottom outer side face. When the moving plate moves transversely under the driving of the double-headed screw rod, the extrusion plate synchronously displaces, and the extrusion plate closely adheres to the outer sleeve by virtue of the arc-shaped structure, uniformly dispersing the force transmitted by the moving plate, effectively avoiding uneven stress on the outer sleeve, and ensuring that the inner and outer sleeves stably and evenly hold the bolt, which not only improves the clamping precision and accurately positions the bolt, but also reduces the loosening risk caused by uneven stress, greatly enhancing the reliability and practicality of the clamping mechanism under various working conditions;

[0016] 3. In summary, the elastic collet type bolt clamping mechanism, through the setting has fixed plate, motor, bearing, double head screw rod, moving plate and extrusion plate and other structures, fixed plate is motor, bearing and related components provide stable installation site, ensure the stability of the overall structure, motor as power source, through bearing and double head screw rod realize smooth connection, start accurate drive double head screw rod rotation, double head screw rod and moving plate thread cooperation, combined with the moving plate receiving hole sliding groove limit, the rotation movement is converted into the accurate horizontal linear motion of moving plate, and the extrusion plate on the moving plate, with its arc design and the bottom of the sleeve cleverly connected way, the force from the moving plate is evenly and gently applied to the sleeve, prompting the sleeve to realize the close and uniform clamping of the bolt with the inner sleeve, effectively prevent bolt loosening, displacement, greatly improve the precision, efficiency and reliability of clamping operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure schematic diagram of the utility model.

[0018] Figure 2 It is the base structure schematic diagram of the utility model.

[0019] Figure 3 It is the receiving hole plane structure schematic diagram of the utility model.

[0020] Figure 4 It is the receiving hole internal clamping structure schematic diagram of the utility model.

[0021] Figures 1-4 Middle: 1, base; 101, connecting column; 102, top plate; 103, receiving hole; 104, through hole; 2, outer sleeve; 201, embedded hole; 202, inner sleeve; 203, placing hole; 3, fixed plate; 301, motor; 302, bearing; 303, double head screw rod; 4, moving plate; 401, screw hole; 402, connecting block; 403, extrusion plate. DETAILED DESCRIPTION

[0022] The utility model embodiments will be described below with reference to the accompanying drawings. Figures 1-4 The technical solutions in the utility model embodiments are clearly and completely described.

[0023] Please refer to Figures 1-4The utility model discloses a kind of elastic collet formula bolt clamping mechanisms, comprising: base 1, several outer sleeves 2 are embedded and installed on the upper end of base 1, fixed plate 3 is fixedly installed in the inside of the upper end of base 1, moving plate 4 is threadedly connected with between fixed plate 3, several containing holes 103 are provided in the upper end of base 1, outer sleeve 2 is embedded in the inside of containing hole 103, fixed plate 3 is fixedly installed in the bottom outer end surface of containing hole 103, and containing hole 103 bottom is provided with sliding groove and moving plate 4 sliding connection, double head screw rod 303 is rotatably connected with between fixed plate 3, double head screw rod 303 is threadedly connected with moving plate 4, connecting column 101 is fixedly installed in the middle of the upper end of base 1, top plate 102 is fixedly connected with on the upper end of connecting column 101, several through holes 104 are provided in the upper end of top plate 102, the number of through hole 104 is consistent with containing hole 103, outer sleeve 2 is embedded in containing hole 103 by passing through through hole 104, embedding hole 201 is provided in the upper end of outer sleeve 2, inner sleeve 202 is embedded and installed in embedding hole 201, placing hole 203 is provided in the upper end of inner sleeve 202, when using, first, outer sleeve 2 is stably embedded in the containing hole 103 of base 1, its upper end passes through the through hole 104 of top plate 102, ensure the vertical stability of outer sleeve 2, can accurately position subsequent operation position. Inner sleeve 202 is pre-installed in embedding hole 201, placing hole 203 is prepared to receive bolt to be clamped, at this moment, the clamping space formed by the combination of inner sleeve and outer sleeve is in the state of being opened relatively large, waiting for bolt to enter, the bolt to be clamped is placed in the placing hole 203 of inner sleeve 202 from above top plate 102. Since the size of placing hole 203 is designed to adapt to common bolt specifications, it is convenient and fast to place, and the placing process is relatively intuitive, and the operator can easily confirm whether the bolt is accurately in place. After the bolt is placed, the entire clamping action is driven by rotating double head screw rod 303. Double head screw rod 303 is located between fixed plate 3 and is rotatably connected therewith, when rotating, since it is threadedly connected with moving plate 4, and moving plate 4 is limited in the sliding groove at the bottom of containing hole 103 and can only do linear translation motion, so the rotation of double head screw rod 303 is converted into the horizontal linear movement of moving plate 4. As moving plate 4 moves towards the direction of approaching central connecting column 101, moving plate 4 will extrude the bottom of outer sleeve 2. After outer sleeve 2 is extruded by moving plate 4, since its upper end is limited to upward displacement by the through hole 104 of top plate 102, only a slight deformation in the vertical direction or the extrusion force is transmitted to the inner sleeve 202 inside, so that the inner sleeve and the outer sleeve tightly hold the bolt, the clamping of the bolt is realized, and the rotating state of double head screw rod 303 is continuously maintained until the inner sleeve and the outer sleeve provide sufficient clamping force, to ensure that the bolt does not loosen displacement in the subsequent operation process. When the bolt needs to be loosened, double head screw rod 303 is reversely rotated, moving plate 4 moves away from central connecting column 101, and the extrusion force on outer sleeve 2 gradually decreases.The inner sleeve and the outer sleeve loosen the clamping of the bolt under the elastic restoring force and the lack of external force to maintain the clamping state, and the bolt can be taken out from the placing hole 203, completing a complete clamping-loosening operation cycle.

[0024] In the embodiment of the utility model, motor 301 is fixedly installed on the outer end surface of fixed plate 3, bearing 302 is fixedly installed on fixed plate 3, and the two ends of double -end screw rod 303 are rotatably connected with bearing 302, one end of double -end screw rod 303 is fixedly connected with the output end of motor 301 through bearing 302, screw holes 401 are formed on moving plate 4, screw holes 401 are screwed with double -end screw rod 303, connecting block 402 is fixedly installed on the upper side of the inner side of moving plate 4, extruding plate 403 is fixedly installed on the inner side of connecting block 402, motor 301 is started, and the output end of motor 301 drives double -end screw rod 303 to rotate. Because the two ends of double -end screw rod 303 are fixed on fixed plate 3 through bearing 302, stable rotation can be ensured, and screw holes 401 of moving plate 4 and double -end screw rod 303 form a screw transmission structure, so with the rotation of double -end screw rod 303, moving plate 4 moves linearly in the direction of center connecting column 101 under the screw thread action of screw holes 401 and double -end screw rod 303. When moving plate 4 moves, connecting block 402 and extruding plate 403 move synchronously, and extruding plate 403 first contacts the bottom of outer sleeve 2. Because extruding plate 403 has a certain area and rigidity, the force from moving plate 4 can be more evenly dispersed to outer sleeve 2. Outer sleeve 2 is extruded by extruding plate 403, and the upper end is limited and cannot move upward (is restricted by through hole 104 of top plate 102), so deformation in the vertical direction or transmission of force to inner sleeve 202 inside is generated, the inner sleeve and the outer sleeve clasp the bolt, and the clamping of the bolt is released. With the continuous operation of motor 301, double -end screw rod 303 continuously rotates, the moving distance of moving plate 4 can be accurately controlled, and then the size of the clamping force is accurately controlled until the preset clamping requirement is reached. After motor 301 stops operating, the self-locking characteristic (the screw thread cooperation of double -end screw rod 303 and moving plate 4) of the screw thread is relied on, the stable clamping state of the inner sleeve and the outer sleeve to the bolt is kept, and it is ensured that the bolt does not loosen and displace in subsequent operation. When the bolt needs to be loosened, motor 301 is started again, and it is reversed. Double -end screw rod 303 reversely rotates, moving plate 4 moves away from center connecting column 101 under the screw thread action, the extrusion force of connecting block 402 and extruding plate 403 to outer sleeve 2 gradually decreases. The inner sleeve and the outer sleeve loosen the clamping of the bolt under the elastic restoring force and the lack of external force to maintain the clamping state, and the bolt can be taken out from the placing hole 203, completing a complete clamping-loosening operation cycle.

[0025] In the utility model embodiment, the extrusion plate 403 is arranged in an arc shape and movably connected to the outer side of the bottom of the outer sleeve 2. The arc-shaped extrusion plate 403 can better fit the arc of the outer side of the bottom of the outer sleeve 2. When the moving plate 4 pushes the extrusion plate 403 to apply force to the outer sleeve 2, the force can be evenly distributed on the arc surface in contact with the outer sleeve 2. Compared with planar contact, arc contact can effectively avoid stress concentration points, so that the outer sleeve 2 is more uniformly stressed, thereby ensuring the uniformity of the force when the inner sleeve and the outer sleeve clamp the bolt, reducing the deformation or loosening risk of the bolt due to uneven stress, and in the extrusion process, it not only provides radial inward extrusion force, but also plays a certain guiding role in the deformation of the outer sleeve 2. When the outer sleeve 2 is extruded, the bottom will tend to adaptively deform according to the arc profile of the extrusion plate 403. This guided deformation helps the inner sleeve 202 to shrink more accurately in the vertical direction, thereby improving the clamping accuracy of the bolt and ensuring that the bolt can maintain an ideal central position after clamping.

[0026] Working principle: The operator holds the bolt to be clamped, and places the bolt into the placing hole 203 of the inner sleeve 202 from above the top plate 102. Then the motor 301 is started. After the motor 301 is connected to the power supply, the output end of the motor 301 starts to drive the double-headed screw rod 303 to rotate. Since the double-headed screw rod 303 is fixed on the fixed plate 3 through the bearings 302 at both ends, the rotation process is stable and the shaft position is unchanged. Since the double-headed screw rod 303 and the screw hole 401 of the moving plate 4 form a close threaded transmission structure, according to the screw transmission principle, as the double-headed screw rod 303 rotates, the moving plate 4 starts to move in a horizontal straight line towards the central connecting column 101 at the upper end of the base 1 under the interaction of the screw thread of the screw hole 401 and the double-headed screw rod 303. During the movement of the moving plate 4, the connecting block 402 and the extrusion plate 403 connected thereto are synchronously moved towards the bottom of the outer sleeve 2 and finally come into contact. Since the extrusion plate 403 is arranged in an arc shape and is movably connected to the outer side of the bottom of the outer sleeve 2, when the contact occurs, the arc-shaped extrusion plate 403 can perfectly fit the outer side arc of the bottom of the outer sleeve 2 due to its shape advantage, so that the extrusion force from the moving plate 4 can be evenly distributed on the arc surface in contact with the outer sleeve 2, effectively avoiding the occurrence of stress concentration points and ensuring that the outer sleeve 2 is uniformly stressed. After the outer sleeve 2 is uniformly extruded by the extrusion plate 403, its upper end is firmly limited from moving upward by the through hole 104 of the top plate 102, and can only produce two responses in the vertical direction: one is to produce a slight deformation itself, and the other is to transmit the extrusion force to the inner sleeve 202 inside, so as to make the inner and outer sleeves tightly hold the bolt and achieve the initial clamping of the bolt. The motor 301 continues to operate, and the double-headed screw rod 303 continues to rotate stably. By controlling the operating time or rotating speed of the motor 301, the moving distance of the moving plate 4 can be accurately controlled, and the clamping force applied by the inner and outer sleeves to the bolt can be accurately controlled. As the clamping force gradually increases, the holding degree of the inner and outer sleeves to the bolt is continuously strengthened until the preset clamping requirement is reached, at which time the motor 301 stops operating. After the motor 301 stops operating, relying on the self-locking characteristic of the screw thread (the screw thread cooperation between the double-headed screw rod 303 and the moving plate 4), even if there is a certain vibration or interference outside, the moving plate 4 and the extrusion plate 403 connected thereto can remain at the current position, thereby ensuring the stable clamping state of the inner and outer sleeves to the bolt, so that the bolt will not be loose and displaced in the subsequent mechanical processing, equipment assembly and other operation processes. When the bolt needs to be loosened, the operator starts the motor 301 again to make it reverse (opposite to the direction during clamping). The double-headed screw rod 303 reversely rotates, and according to the screw transmission principle, the moving plate 4 moves in a horizontal straight line away from the central connecting column 101 under the action of the screw thread, and the connecting block 402 and the extrusion plate 403 move synchronously, and the extrusion force on the outer sleeve 2 gradually decreases. As the extrusion force decreases, the inner and outer sleeves gradually loosen the clamping of the bolt under the elastic restoring force of the inner and outer sleeves and the lack of external force to maintain the holding state.The bolt can be smoothly taken out from the placing hole 203 of the inner sleeve 202, a complete clamping-loosening operation cycle is completed, the whole mechanism returns to the initial state, and is prepared for the next operation.

Claims

1. An elastic collet type bolt clamping mechanism comprising: The base (1) is embedded with several outer sleeves (2) at the upper end, fixed with fixed plates (3) at the inner upper end, and threaded with moving plates (4) between the fixed plates (3), characterized in that: the base (1) is provided with several accommodation holes (103) at the upper end, the outer sleeves (2) are embedded in the accommodation holes (103), the fixed plates (3) are fixed at the bottom outer end surface of the accommodation holes (103), and the accommodation holes (103) are provided with sliding grooves at the bottom and are slidably connected with the moving plates (4), the fixed plates (3) are rotatably connected with double-headed screws (303), and the double-headed screws (303) are threaded with the moving plates (4).

2. A collet-type bolt clamping mechanism according to claim 1, wherein: The base (1) is fixed with a connecting column (101) at the middle of the upper end, the connecting column (101) is fixed with a top plate (102) at the upper end, the top plate (102) is provided with several through holes (104) at the upper end, the number of the through holes (104) is consistent with that of the accommodation holes (103), and the outer sleeves (2) are embedded in the accommodation holes (103) through the through holes (104).

3. A collet-type bolt clamping mechanism according to claim 1, wherein: The outer sleeve (2) is provided with an embedded hole (201) at the upper end, and an inner sleeve (202) is embedded and installed in the embedded hole (201), and the inner sleeve (202) is provided with a placing hole (203) at the upper end.

4. A collet-type bolt clamping mechanism according to claim 1, wherein: The fixed plate (3) is fixed with a motor (301) at the outer end surface, and is fixed with a bearing (302) on the fixed plate (3), the bearing (302) is rotatably connected with both ends of the double-headed screw (303), and one end of the double-headed screw (303) is fixedly connected with the output end of the motor (301) through the bearing (302).

5. A collet-type bolt clamping mechanism according to claim 1, wherein: The moving plate (4) is provided with a threaded hole (401) at the upper end, the threaded hole (401) is threaded with the double-headed screw (303), the moving plate (4) is fixedly installed with a connecting block (402) on the inner upper surface, and the connecting block (402) is fixedly installed with an extrusion plate (403) on the inner surface.

6. A collet-type bolt clamping mechanism according to claim 5, wherein: The extrusion plate (403) is arc-shaped and movably connected with the outer side surface of the outer sleeve (2).

Images