Automatic hole searching and positioning device for automatic shaft sleeve riveting device

Abstract

The invention discloses an automatic hole searching and positioning device for an automatic shaft sleeve riveting device. The automatic hole searching and positioning device comprises a base, and an air cylinder is arranged at the bottom of the base. Through the arrangement of the first proximity switch and the second proximity switch, when a signal input point on the bottom side and the second proximity switch are inducted in parallel, the second proximity switch sends out a signal to enable a workpiece to be automatically fed and discharged, meanwhile, the air cylinder stretches out to drive the pull rod to stretch out, and the reciprocating mechanism and the positioning pin are jacked and stretched upwards; when the positioning pin makes contact with the bottom face of a workpiece and does not penetrate through a hole site, the two signal input points are located between the first proximity switch and the second proximity switch, the first proximity switch and the second proximity switch do not output signals, misjudgment is avoided, after the positioning pin penetrates through the hole site, the signal input point on the top side is flush with the first proximity switch and is inducted, and the positioning pin is driven to rotate. When the workpiece is riveted, the first proximity switch sends a signal to enable the automatic riveting device to rivet the workpiece, so that the misjudgment rate is greatly reduced, and unmanned production is realized.

Description

Technical Field

[0001] The invention relates to the technical field of shaft sleeve riveting, in particular to an automatic hole finding and positioning device for a shaft sleeve automatic riveting device. Background Art

[0002] When riveting the sleeve to the valve bracket, most of the industry uses semi-automatic / manual positioning riveting. The worker holds the product, aligns the workpiece hole with the riveting position, places the sleeve, and starts riveting. This method has high labor costs and high risks. Alternatively, automatic riveting is used, and the riveting device is set in the rolling mill, which is linked with the rolling mill to identify the hole position. The speed is slow and difficult to debug. Both methods have advantages and disadvantages.

[0003] At present, there are two ways to achieve copper sleeve installation (riveting): semi-automatic method: manual feeding riveting and semi-automatic manual feeding riveting. Both require manual holding of the product to position the hole, manual / foot switch, and complete one riveting. This method is extremely inefficient and has high operator fatigue. Batch production is prone to occupational injuries or accidents. Automatic method: Taking the air valve bracket as an example, after the rolling mill is formed, the holes are punched in the machine and the automatic riveting is completed. The positioning of the hole relies on the feeding encoder and the infrared detector to identify the position of the hole. The disadvantage is that the electronic control misjudgment rate is high, and the equipment debugging and maintenance costs are high. In view of the above shortcomings, the present invention adopts a clamp to replace human hands to hold the material for positioning, and uses a mechanical structure to identify the hole position, which greatly reduces the misjudgment rate and realizes unmanned production. Summary of the invention

[0004] In order to solve the problems raised in the above-mentioned background technology, the purpose of the present invention is to provide an automatic hole-finding and positioning device for an automatic riveting device for a shaft sleeve, which has the advantages of fully automatic feeding and limiting, automatic identification of hole positions, no manual operation and low error rate, and solves the current methods of copper sleeve installation (riveting), which include: semi-automatic method: manual feeding and riveting and semi-automatic manual feeding and riveting, both of which require manual holding of the product to position the hole, manual / foot switch, and complete one riveting. This method is extremely inefficient and has high operator fatigue. Mass production is prone to occupational injuries or accidents. Automatic method: taking the air valve bracket as an example, after the rolling mill is formed, punching is performed in the machine and automatic riveting is completed. The positioning of the hole relies on the feeding encoder and the infrared detector to identify the position of the hole. The disadvantages are high electronic control misjudgment rate and high equipment debugging and maintenance costs.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic hole-finding and positioning device for an automatic riveting device for a sleeve, comprising a base, a cylinder is arranged at the bottom of the base, a pull-down joint is fixedly connected to the output end of the cylinder, a pull rod is arranged at the top of the pull-down joint, the bottom end of the pull rod passes through the pull-down joint and is fixedly connected thereto, signal input points are arranged on both sides of the middle part of the pull rod surface, a first proximity switch and a second proximity switch are arranged on the right side of the pull rod, a positioning block is arranged at the bottom side inside the base, a spring is fixedly connected to the top of the positioning block, a reset mechanism is arranged inside the base, an annular ring is fixedly connected to the curved surface of the reset mechanism, the annular ring is slidably connected to the inner wall of the base, the top of the spring is fixedly connected to the bottom surface of the annular ring, a slot is opened on the bottom surface of the reset mechanism, the top of the pull rod passes through the positioning block and extends to the inside of the slot, the pull rod is slidably connected to the positioning block, a positioning pin is arranged on the surface of the top of the reset mechanism, and a workpiece is arranged on the top of the base.

[0006] As a preferred embodiment of the present invention, nuts are provided on both upper and lower sides of the signal input point, and the nuts are sleeved on the surface of the pull rod and threadedly connected thereto.

[0007] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a first proximity switch and a second proximity switch. When the signal input point on the bottom side of the pull rod surface is parallel to the second proximity switch and is sensed by the second proximity switch, the second proximity switch sends a signal to automatically load and unload the workpiece, and at the same time the cylinder extends to drive the pull rod to extend, and the reciprocating mechanism and the positioning pin are pushed upward. At the same time, the reciprocating mechanism moves upward to stretch the spring. When the positioning pin contacts the bottom surface of the workpiece and does not pass through the hole, the two signal input points are located between the first proximity switch and the second proximity switch. The first proximity switch and the second proximity switch will not output signals, thereby avoiding misjudgment. When the positioning pin passes through the hole, the signal input point on the top side will be flush with the first proximity switch and sensed, and the first proximity switch will send a signal to enable the automatic riveting device to rivet the workpiece, thereby greatly reducing the misjudgment rate and realizing unmanned production.

[0008] 2. The present invention can adjust the distance between two signal input points by adjusting the position of the nut through the setting of the nut, so as to adapt to workpieces of different sizes, thereby greatly improving the applicability of the device and facilitating the promotion of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a front cross-sectional schematic diagram of the structure of the present invention; Figure 3 It is a top view schematic diagram of the structure of the present invention; Figure 4 The structure of the present invention Figure 2 A is an enlarged schematic diagram; Figure 5 It is a schematic diagram of the structural working process of the present invention.

[0010] In the figure: 1. base; 2. cylinder; 3. pull-down joint; 4. pull rod; 5. first proximity switch; 6. second proximity switch; 7. positioning block; 8. spring; 9. positioning pin; 10. workpiece. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0012] like Figures 1 to 5 As shown, an automatic hole-finding and positioning device for an automatic riveting device for a sleeve comprises a base 1, a cylinder 2 is arranged at the bottom of the base 1, a pull-down joint 3 is fixedly connected to the output end of the cylinder 2, a pull rod 4 is arranged at the top of the pull-down joint 3, the bottom end of the pull rod 4 passes through the pull-down joint 3 and is fixedly connected thereto, signal input points are arranged on both sides of the middle of the surface of the pull rod 4, a first proximity switch 5 and a second proximity switch 6 are arranged on the right side of the pull rod 4, a positioning block 7 is arranged at the bottom side inside the base 1, a spring 8 is fixedly connected to the top of the positioning block 7, a reset mechanism is arranged inside the base 1, an annular ring is fixedly connected to the curved surface of the reset mechanism, the annular ring is slidably connected to the inner wall of the base 1, the top of the spring 8 is fixedly connected to the bottom surface of the annular ring, a slot is opened on the bottom surface of the reset mechanism, the top end of the pull rod 4 passes through the positioning block 7 and extends to the inside of the slot, the pull rod 4 is slidably connected to the positioning block 7, a positioning pin 9 is arranged on the surface of the top of the reset mechanism, and a workpiece 10 is arranged on the top of the base 1.

[0013] refer to Figure 1 , Figure 2 and Figure 5 Nuts are provided on both the upper and lower sides of the signal input point, and the nuts are sleeved on the surface of the pull rod 4 and threadedly connected thereto.

[0014] As a technical optimization solution of the present invention, through the setting of the nut, the distance between the two signal input points can be adjusted by adjusting the position of the nut, so as to adapt to workpieces of different sizes, thereby greatly improving the applicability of the device and facilitating the promotion of the device.

[0015] The working principle and use process of the present invention are as follows: before use, the mechanical position of the signal input point needs to be adjusted according to the product size. When the signal input point on the bottom side of the pull rod 4 is parallel to the second proximity switch 6 and is sensed by the second proximity switch 6, the second proximity switch 6 sends a signal to automatically load and unload the workpiece. At the same time, the cylinder 2 extends, driving the pull rod 4 to extend, and the reciprocating mechanism and the positioning pin 9 are pushed upward. At the same time, the reciprocating mechanism moves upward to stretch the spring 8. When the positioning pin 9 contacts the bottom surface of the workpiece and does not pass through the hole, the two signal input points are located at the first proximity switch 5 and the second proximity switch 6. During this period, the first proximity switch 5 and the second proximity switch 6 will not output signals, thus avoiding misjudgment. When the positioning pin 9 passes through the hole, the signal input point on the top side will be flush with the first proximity switch 5 and be sensed, and the first proximity switch 5 will send a signal to enable the automatic riveting device to rivet the workpiece. At the same time, the cylinder 2 contracts to drive the pull rod 4 to descend, and the reset mechanism will reset under the contraction of the spring 8, so that the positioning pin 9 slides into the base 1. When the pull rod 4 descends, the signal input point on the bottom side of its surface will be parallel to the second proximity switch 6 and be sensed, and the above steps will be repeated to realize unmanned production.

[0016] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0017] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic hole-finding and positioning device for an automatic riveting device for a shaft sleeve, comprising a base (1), characterized in that: A cylinder (2) is arranged at the bottom of the base (1), the output end of the cylinder (2) is fixedly connected to a pull-down joint (3), a pull rod (4) is arranged at the top of the pull-down joint (3), the bottom end of the pull rod (4) passes through the pull-down joint (3) and is fixedly connected thereto, signal input points are arranged on both sides of the middle of the surface of the pull rod (4), a first proximity switch (5) and a second proximity switch (6) are arranged on the right side of the pull rod (4), a positioning block (7) is arranged at the bottom side of the interior of the base (1), and the top of the positioning block (7) is fixedly connected to the pull-down joint (3). A spring (8) is connected, a reset mechanism is arranged inside the base (1), the curved surface of the reset mechanism is fixedly connected with an annular ring, the annular ring is slidably connected to the inner wall of the base (1), the top of the spring (8) is fixedly connected to the bottom surface of the annular ring, a slot is arranged on the bottom surface of the reset mechanism, the top of the pull rod (4) passes through the positioning block (7) and extends to the inside of the slot, the pull rod (4) is slidably connected to the positioning block (7), a positioning pin (9) is arranged on the surface of the top of the reset mechanism, and a workpiece (10) is arranged on the top of the base (1).

2. The automatic hole-finding and positioning device for the automatic riveting device of a sleeve according to claim 1, characterized in that: Nuts are provided on both the upper and lower sides of the signal input point, and the nuts are sleeved on the surface of the pull rod (4) and threadedly connected thereto.

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