Direct-drive rotary clamping mechanism capable of sensing clamped object with signal

Abstract

The invention discloses a direct-driven rotary clamping mechanism capable of sensing a clamped object with a signal, and relates to the technical field of clamping rotating mechanisms, the direct-driven rotary clamping mechanism comprises a rotating mandrel, a star-shaped sealing ring, a double-acting clamping air cylinder and a conducting ring, a rotating shaft is directly driven through a servo motor, and the problem that the positioning precision is poor due to indirect driving rotation is solved; two paths of gas are guided into the double-acting clamping cylinder by radially rotating and sealing the rotating shaft at the front end of the rotating shaft through the star-shaped sealing ring, opening and closing of the clamping cylinder are completely controlled through compressed gas, and the problem that a spring cannot be bounced off due to spring metal fatigue and elasticity reduction of a single-acting clamping cylinder is solved; a conductive ring is arranged in the middle of a rotating shaft to supply power to a magnetic switch of a rotary clamping air cylinder and an object sensor, transmit signals to the magnetic switch and the object sensor and provide alarm and signal feedback for a rotary clamping mechanism. The problem that in the prior art, a rotary clamping part cannot collect air cylinder signals or monitor whether products fall off or not in the clamping, rotating and transporting processes is solved.

Description

Technical Field

[0001] The invention relates to the technical field of clamping and rotating mechanisms, and in particular to a direct-drive rotating clamping mechanism capable of clamping an object with signal induction. Background Art

[0002] In the automated production process, it is necessary to clamp the incoming items from the front section, take them to the visual photography station for visual positioning of the items, then the clamping and rotating mechanism needs to correct the angle of the photographed items and place the corrected items in the positioning fixture to complete other process operations.

[0003] The existing clamping and rotating mechanisms mainly include two types:

[0004] The first is that the servo motor indirectly drives the rotating part through the synchronous wheel and synchronous belt. A rotating air joint is installed at the center of the tail of the rotating part. This structure can only conduct one gas, so the clamping cylinder used can only be a single-acting clamping cylinder. When clamping and taking objects, it is clamped by ventilation. When placing objects, the clamping claw relies on the compression spring inside the single-acting clamping cylinder to bounce open. This structure is that the synchronous wheel and synchronous belt indirectly drive the rotating part, and it is a single-acting clamping cylinder; such a structure has four main problems:

[0005] 1. The indirect drive rotation positioning accuracy of the synchronous wheel and synchronous belt is not good enough

[0006] 2. This structure has no sensor monitoring after the clamping part clamps the object, which may cause the object to fall off during rotation or transportation without alarming and shutting down.

[0007] 3. This structure can only conduct one gas to the single-acting clamping cylinder, which is ventilated and clamped when clamping and picking up objects. Whether the clamping action is completed or not is not fed back to the controller by the magnetic switch signal on the clamping cylinder before the next action is performed. When the supply pressure of the clamping cylinder is insufficient, it is easy to cause the next action to be performed before the clamp is in place, causing equipment failure and shutdown.

[0008] 4. When placing objects, the single-acting clamping cylinder relies on the compression spring inside the cylinder to pop open. After a period of use, the spring metal fatigues and the elastic force decreases, causing the spring to fail to pop open.

[0009] The second type is that the servo motor is indirectly driven by a synchronous wheel and a synchronous belt. A double-acting pen-shaped telescopic cylinder is used at the center of the tail of the rotating part to drag the clamp connecting rod at the head of the rotating part. A mechanical clamp is designed at the head of the rotating part. When the pen-shaped cylinder at the tail of the rotating part extends, the clamp clamps the object. When the pen-shaped cylinder at the tail retracts, the clamp opens and puts down the object. This structure is that the synchronous wheel and the synchronous belt indirectly drive the rotating part, and the clamping part is a mechanical clamp, which is clamped by the cylinder at the tail of the rotating part. There are two main problems with this structure:

[0010] 1. The indirect drive rotation positioning accuracy of the synchronous wheel and synchronous belt is not good enough

[0011] 2. This structure has no sensor monitoring after the clamping part clamps the object, which may cause the object to fall off during rotation or transportation without alarming and shutting down.

[0012] 3. Because the double-acting pen-shaped telescopic cylinder at the tail is fixed, its telescopic rod rotates with the rotating part, and the sealing ring inside the cylinder is easily damaged.

[0013] In view of the problems existing in the above two existing clamping and rotating mechanisms, it is necessary to provide a new clamping and rotating mechanism. Summary of the invention

[0014] The purpose of the present invention is to provide a direct-drive rotary clamping mechanism with signal sensing for clamping objects, which solves the problem that the current rotary clamping mechanism is unable to collect cylinder signals and monitor whether the product falls during the clamping, rotation and transportation process in the rotating clamping part; the device adopts a servo motor direct drive mode, which solves the problem that the mechanism must indirectly drive the clamping part to rotate through a synchronous belt / wheel, resulting in inaccurate rotation positioning angle accuracy.

[0015] To achieve the above object, the present invention provides the following solution: The present invention provides a direct-drive rotating clamping mechanism capable of clamping an object with signal induction, comprising:

[0016] A rotating spindle is rotatably mounted in the housing cavity, a servo motor is connected to an input end of the rotating spindle via a coupling, and the servo motor directly drives the rotating spindle to rotate via the coupling.

[0017] A star-shaped sealing ring, wherein a plurality of the star-shaped sealing rings are arranged at equal intervals in the shell cavity, and the plurality of the star-shaped sealing rings radially seal the rotating spindle; two air inlet connection ports are provided on the inner side of the star-shaped sealing ring, and the air inlet connection ports are used to connect the intake compressed gas; two air guide holes are provided on both sides of the axis of the rotating spindle, and the two air guide holes are respectively connected to the two air inlet connection ports on the inner side of the star-shaped sealing ring;

[0018] A double-acting clamping cylinder, wherein the two air guide holes are respectively connected to two air passages of the double-acting clamping cylinder, the two air passages are used to control the opening and closing of the double-acting clamping cylinder, and the end of the double-acting clamping cylinder is equipped with a clamping claw;

[0019] A conductive ring, comprising a rotating ring and a conductive block, wherein the rotating ring is sleeved on the rotating spindle, a center hole is opened in the middle of the rotating spindle, and the conductive wire of the rotating ring is guided through the center hole to the front end of the rotating spindle to supply power to the sensor and the magnetic switch at the double-acting clamping cylinder; the conductive block is fixed on the inner side of the shell cavity, and the conductive block and the rotating ring are in metal friction contact to transfer current.

[0020] Preferably, the conductive ring is mounted on the outer periphery of the rotating spindle close to the input end, and the star-shaped sealing ring is mounted on the outer periphery of the rotating spindle close to one side of the double-acting clamping cylinder.

[0021] Preferably, the rotating spindle is rotatably assembled in the housing cavity via a ball bearing.

[0022] Preferably, the plurality of star-shaped sealing rings are three star-shaped sealing rings, and the three star-shaped sealing rings are arranged at equal intervals along the axial direction of the rotating spindle.

[0023] Preferably, the conductive ring is a six-way split conductive ring, and the rotating ring is sleeved on the rotating spindle through a set screw hole.

[0024] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0025] The direct-drive rotary clamping mechanism capable of clamping objects with signal induction of the present invention comprises a rotary spindle, a star-shaped sealing ring, a double-acting clamping cylinder and a conductive ring. The rotary shaft is directly driven by a servo motor, thereby solving the problem of poor precision of indirect driven rotary positioning of synchronous wheels and synchronous belts. Two-way gas is introduced into the double-acting clamping cylinder at the front end of the rotary shaft by radially rotating and sealing the rotary shaft through a star-shaped sealing ring. The opening and closing of the clamping cylinder is completely controlled by compressed gas, thereby solving the problem that the single-acting clamping cylinder relies on the compressed spring inside the cylinder to spring open when placing an object, but after a period of use, the spring cannot spring open due to metal fatigue and reduced elastic force. A conductive ring is customized in the middle part of the rotary shaft to power and transmit signals to the magnetic switch and the object sensor of the rotary clamping cylinder, thereby solving the problem that there is no sensor monitoring after the clamping part clamps the object, which easily leads to the phenomenon that the object falls off during the rotation and transportation process but no alarm is stopped, and there is no magnetic switch signal feedback to the controller for the next step when clamping and taking the object. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of a direct-drive rotary clamping mechanism capable of sensing a clamped object with a signal;

[0028] Figure 2 A cross-sectional view of the internal structure of a direct-drive rotary clamping mechanism capable of sensing a clamped object with a signal;

[0029] Figure 3 Diagram of how to power the sensor;

[0030] Figure 4 This is a disassembled diagram of a direct-drive rotary clamping mechanism capable of sensing the clamped object with a signal;

[0031] Among them, 1. Clamp; 2. Double-acting clamping cylinder; 3. Rotating spindle; 4. Locking nut; 5. Angular contact bearing; 6. Servo motor; 7. Ball bearing; 8. Star seal ring; 9. Conductive ring; 10. Coupling; 11. Sensor; 12. Wire; 13. Rotating ring; 14. Cable; 15. Conductive block. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a direct-drive rotary clamping mechanism with signal sensing for clamping objects, which solves the problem that the current rotary clamping mechanism is unable to collect cylinder signals and monitor whether the product falls during the clamping, rotation and transportation process in the rotating clamping part; the device adopts a servo motor direct drive mode, which solves the problem that the mechanism must indirectly drive the clamping part to rotate through a synchronous belt / wheel, resulting in inaccurate rotation positioning angle accuracy.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1-Figure 4As shown, the present invention provides a direct-drive rotary clamping mechanism capable of clamping an object with signal induction, the mechanism is a linear axis layout and adopts a servo motor 6 to directly drive a rotating spindle 3 through a coupling 10; three star-shaped sealing rings 8 are arranged at equal intervals in the front end housing cavity of the mechanism to radially rotate and seal the rotating spindle 3, and two air inlet connection ports are opened on the inner side of the star-shaped sealing ring 8 of the housing cavity for connecting the intake compressed gas, and two air guide holes are opened on both sides of the central axis of the rotating spindle 3 and are respectively connected to the two air inlets on the inner side of the star-shaped sealing ring 8; the two air guide holes are respectively connected to two air paths of a double-acting clamping cylinder 2, the two air paths are used to control the opening and closing of the double-acting clamping cylinder 2, and the end of the double-acting clamping cylinder 2 is equipped with a clamping jaw 1, which is used to clamp a workpiece.

[0036] A six-way split conductive ring 9 is customized in the middle part of the rotating spindle 3, and the rotating ring 13 is sleeved on the rotating spindle 3 through the set screw hole. A hole is opened in the middle position of the rotating spindle 3, and then the conductive wire 12 of the rotating ring 13 part of the conductive ring 9 is guided through the center hole to the front end of the rotating spindle 3 to power the magnetic switch of the double-acting clamping cylinder 2 and the sensor 11 for clamping the object; the conductive block 15 of the stationary part of the conductive ring 9 is fixed on the shell cavity, and the conductive block 15 of the stationary part is always in metal friction contact with the rotating ring 13 to transmit current; when the conductive block 15 of the stationary part of the conductive ring 9 is powered, the current is transmitted to the magnetic switch of the rotating clamping cylinder and the sensor 11 for clamping the object at the front end of the rotating spindle 3 to supply power and transmit signals.

[0037] The present invention provides a direct-drive rotary clamping mechanism capable of inducing a clamped object with signals. A star-shaped sealing ring 8 is used on a rotating mandrel 3 to radially rotate and seal the rotating mandrel 3 and a split conductive ring 9 is installed in a linear layout to achieve the purpose of simultaneously transmitting multiple gases and multiple currents to the end of the rotating mandrel 3 and achieving the purpose of directly driving the rotating part of the servo motor 6 to improve the rotation positioning accuracy. The mechanism adopts the direct drive mode of the servo motor 6, and the rotary clamping part can collect cylinder signals and monitor whether the product falls during the clamping, rotation, and transportation process; the opening and closing actions of the clamping cylinder of the mechanism can be controlled by gas, and at the same time, the mechanism is more compact than the existing structures on the market.

[0038] The advantages of the direct-drive rotary clamping mechanism capable of clamping objects with signal induction of the present invention are as follows:

[0039] 1. The rotating spindle 3 is directly driven by the servo motor 6; in the indirect transmission process of the existing synchronous wheel and synchronous belt, the synchronous belt connection is an elastic body rather than a rigid connection, so the rotation angle transmitted to the rotating end is unstable and an angle deviation will occur; the servo motor 6 directly drives the rigid connection to solve the problem of poor indirect drive rotation positioning accuracy of the synchronous wheel and synchronous belt.

[0040] 2. At the front end of the rotating spindle 3, three star-shaped sealing rings 8 are used to radially rotate and seal the rotating shaft to introduce two-way gas into the double-acting clamping cylinder 2. The opening and closing of the double-acting clamping cylinder 2 is completely controlled by compressed gas; the existing single-acting clamping cylinder relies on the compression spring inside the cylinder to pop open when placing objects. After a period of use, the spring cannot pop open due to metal fatigue and reduced elastic force; the use of a two-way air supply method and a double-acting clamping cylinder 2 solves the current problem that the clamping jaw 1 cannot pop open due to metal fatigue of the compression spring inside the single-acting cylinder.

[0041] 3. A six-way split conductive ring 9 is customized in the middle part of the rotating spindle 3 to supply power and transmit signals to the magnetic switch and the object sensor 11 of the rotating clamping cylinder; the existing rotating clamping mechanism cannot solve the problem of simultaneous power supply and air supply. This method solves the problem that there is no sensor 11 to monitor after the clamping part clamps the object, which may cause the object to fall off during rotation and transportation without alarming and stopping, and there is no magnetic switch signal feedback to the controller for the next step when clamping and taking the object.

[0042] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A direct-drive rotary clamping mechanism capable of clamping an object with signal induction, characterized in that: include: A rotating spindle, the rotating spindle is rotatably assembled in the housing cavity, the servo motor is connected to the input end of the rotating spindle through a coupling, and the servo motor directly drives the rotating spindle to rotate through the coupling; A star-shaped sealing ring, wherein a plurality of the star-shaped sealing rings are arranged at equal intervals in the shell cavity, and the plurality of the star-shaped sealing rings radially seal the rotating spindle; two air inlet connection ports are provided on the inner side of the star-shaped sealing ring, and the air inlet connection ports are used to connect the intake compressed gas; two air guide holes are provided on both sides of the axis of the rotating spindle, and the two air guide holes are respectively connected to the two air inlet connection ports on the inner side of the star-shaped sealing ring; A double-acting clamping cylinder, wherein the two air guide holes are respectively connected to two air passages of the double-acting clamping cylinder, the two air passages are respectively used to control the opening and closing of the double-acting clamping cylinder, and the end of the double-acting clamping cylinder is equipped with a clamping claw; A conductive ring, comprising a rotating ring and a conductive block, wherein the rotating ring is sleeved on the rotating spindle, a center hole is opened in the middle of the rotating spindle, and the conductive wire of the rotating ring is guided through the center hole to the front end of the rotating spindle to supply power to the sensor and the magnetic switch at the double-acting clamping cylinder; the conductive block is fixed on the inner side of the shell cavity, and the conductive block and the rotating ring are in metal friction contact to transfer current.

2. The direct-drive rotary clamping mechanism capable of clamping objects with signal induction according to claim 1, characterized in that: The conductive ring is mounted on the outer periphery of the rotating spindle close to the input end, and the star-shaped sealing ring is mounted on the outer periphery of the rotating spindle close to one side of the double-acting clamping cylinder.

3. The direct-drive rotary clamping mechanism capable of clamping objects with signal induction according to claim 1, characterized in that: The rotating spindle is rotatably assembled in the housing cavity via a ball bearing.

4. The direct-drive rotary clamping mechanism capable of clamping objects with signal induction according to claim 1, characterized in that: The plurality of star-shaped sealing rings are three star-shaped sealing rings, and the three star-shaped sealing rings are arranged at equal intervals along the axial direction of the rotating spindle.

5. The direct-drive rotary clamping mechanism capable of clamping objects with signal induction according to claim 1, characterized in that: The conductive ring is a six-way split conductive ring, and the rotating ring is sleeved on the rotating spindle through a set screw hole.

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