CN102179844A - A kind of automatic screw pressing equipment - Google Patents

Abstract

The invention relates to automatic screw pressing-in equipment, which comprises a screw feeding device, a screw distribution mechanism and a screw pressing-in device, wherein the screw distribution mechanism comprises a distribution block and a screw bearing block, the screw bearing block is provided with two groups of three-way pipelines, an upper pipe orifice is a screw inlet, a lower pipe orifice is connected with a conveying hose, and a side pipe orifice is connected with an air blow pipe; the screw pressing device comprises a screw positioning chuck and a screw pressing cylinder, and a plastic punch is arranged at the end part of a cylinder push rod of the screw pressing cylinder; the front end of the screw positioning chuck is provided with a screw positioning mechanism, the screw positioning mechanism comprises two positioning clamping pieces and a return spring, the two positioning clamping pieces are symmetrically pivoted on the two sides of the tubular body, and the positioning clamping pieces are also provided with guide inclined planes. The automatic screw pressing-in equipment can meet the requirement of automatic screw pressing-in equipment for screws with painted surfaces, simultaneously solves the problem of inaccurate screw positioning of the existing automatic screw pressing-in equipment, can greatly improve the production efficiency and ensures the product quality.

Description

A kind of automatic screw pressing equipment

Technical field:

The invention relates to the technical field of mechanical equipment, in particular to an automatic screw pressing equipment.

Background technique:

Many products such as plastic electrical switch panels on the market are equipped with mounting screws. Some use separate screw small packaging bags in the packaging bags of plastic electrical switch panels and other products, while some directly press the screws into the plastic to save costs. The screw installation holes of the electrical switch panel product share the packaging bag with this product. Existing screw press-in generally adopts manual press-in or simple manual fixture press-in. These two methods increase the post-processing process of the product after plastic molding, prolong the processing cycle, and consume processing time. Only one product can be processed, and the efficiency is very low. Therefore, it is necessary to use automatic screw pressing equipment to complete the job.

However, since the material of the screw is different from the plastic material, and the exposed screw head will affect the overall appearance of the plastic panel and other products, the currently used screw is to coat the screw head with the same color as the plastic panel. The overall look remains the same. Existing automatic screw pressing equipment cannot be used because of the requirement to use painted screws. This is because:

Existing automatic screw pressing equipment mainly includes vibrating screw feeding device and automatic pressing device. Before the existing vibrating feeder screw enters the hose, it keeps vibrating at all times, and the vibrating plate is designed in a spiral shape to make the stroke of vibrating feeding It is very long, so it is easy to shake off the paint surface on the screw head; it is also easy to scratch the paint surface due to the vibration contact between the screw rod and the screw head between the screws, which will affect the quality and appearance of the product; moreover, a vibration feeding The feeder can only meet the use of one screw pressing device, that is, one vibrating feeder can only feed one screw at a time;

In addition, when the screw enters the press-in device for punching, the cylinder punch of the existing press-in device is easy to smash the paint surface on the screw head; and, in terms of screw positioning, the existing screw press-in device There is no special positioning mechanism, and it mainly depends on the inner diameter of the screw and the chuck body for positioning. Since the screw head of the screw is different from the diameter of the screw rod, it will inevitably cause the screw to tilt, making its axis inconsistent with the axis of the cylinder punch. Therefore, when the cylinder punch is punched, it is easy to make the screw go crooked and go off, which affects the product quality and even damages the workpiece.

Invention content:

The purpose of the present invention is to overcome the above disadvantages of the prior art, provide an automatic screw pressing device that can meet the needs of painted screws, and at the same time solve the problem of inaccurate screw positioning in the existing automatic screw pressing device.

The technical solution adopted by the present invention to achieve its purpose is: an automatic screw pressing device, including a screw feeding device and a screw pressing device, wherein:

The screw feeding device has a screw box, one side of the screw box forms a cylindrical space, and a longitudinal turntable with radial blades is installed; the end of an arrangement groove formed by two longitudinal side plates extends into the The middle part of the cylindrical space, and the ends of the longitudinal side plates are respectively provided with inclined guide plates, and the other end of the arrangement groove extends out of the screw box and is connected with a magnetic oscillator;

A screw distribution mechanism is arranged adjacent to the outer end surface of the arrangement groove, the screw distribution mechanism includes a distribution block with a screw distribution groove and adjacent to the outer end surface of the arrangement groove; a screw receiving block is arranged under the distribution block, and the screw receiving block is arranged There are two sets of three-way pipelines, wherein the upper nozzle is the screw inlet, the lower nozzle is connected to the delivery hose, and the side nozzle is connected to the blowing pipe; the distribution block is driven by the first cylinder on the screw receiving block slide;

The screw pressing device comprises a screw positioning chuck and a screw pressing cylinder, the end of the cylinder push rod for screw pressing into the cylinder is provided with a plastic punch; the screw positioning chuck has a tubular body for accommodating the cylinder push rod, and the tubular body The side wall of the side wall is provided with a screw inlet communicating with the delivery hose; the front end of the screw positioning chuck is provided with a screw positioning mechanism, and the screw positioning mechanism includes two positioning clips pivoted symmetrically on both sides of the tubular body and a return spring , The positioning clip also has a guide slope.

In the above technical solution, a plastic cover is provided above the portion of the arrangement groove located outside the screw box.

As a specific embodiment of the present invention, the automatic screw press-in equipment also includes a base frame, the base frame is provided with a set of horizontal slide rails and a set of vertical slide rails, wherein the horizontal slide rails are provided with workpiece positioning grooved workpiece positioning platform, the workpiece positioning platform is driven by the second cylinder to slide along the horizontal slide rail; a fixed bracket is installed on the vertical slide rail, and the screw press-in device is fixedly installed on the fixed bracket, and the fixed bracket Driven by the third air cylinder to slide along the vertical slide rail; the workpiece suction cup is also installed on the fixed bracket.

Further, in the above technical solution, the number of workpiece positioning grooves on the workpiece positioning platform is four, and correspondingly, the number of screw pressing devices and workpiece suction cups on the fixing bracket is also four respectively.

The advantages of the present invention are: except for the static contact between the screws in the screw box, there is only a short dynamic contact during the flipping process, the vibration feeding process of the screw is shortened, and during the feeding process of the arrangement groove, a There is no contact between the screw rod of one screw and the screw heads of other screws, so the paint surface of the screw head will not be shaken off or scratched; and the reasonable setting of the screw distribution mechanism can make one screw feeding device deliver two screws at a time. One screw meets the needs of two screw press-in devices, thus improving production efficiency. In the screw pressing device, the end of the cylinder push rod adopts a plastic punch, which can play a good role in protecting the paint surface of the screw head, avoiding the paint surface of the screw head from being smashed during the stamping process, and ensuring the product is intact; and, through The screw positioning mechanism keeps the axis of the screw consistent with the axis of the cylinder punch before punching, ensuring accurate screw punching and product quality.

Description of drawings:

Fig. 1 is the structural representation of screw feeding device in the automatic screw pressing equipment of the present invention;

Fig. 2, Fig. 3 are the cross-sectional structure schematic diagrams of the screw distributing mechanism in the present invention;

Fig. 4 is a schematic cross-sectional structure diagram of a screw pressing device in the present invention;

Fig. 5 is a schematic structural diagram of an embodiment of the present invention.

Detailed ways:

The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

First, as shown in Figures 1 to 4, the automatic screw pressing device of the present invention includes a screw feeding device 1 and a screw pressing device 2, wherein:

Described screw feeding device 1 has a screw box 11, and one side of screw box 11 forms a cylindrical space 10, and installs a longitudinal turntable 12 with radial vane 121; An arrangement groove formed by two longitudinal side plates 131 The end portion of 13 extends into the middle part of the cylindrical space 10, and the end portion of the longitudinal side plate 131 is also provided with an inclined guide plate 132, and the other end of the arrangement groove 13 extends out of the screw box 11 and oscillates with a magnetic force. Connected to the device 14; a plastic cover 133 is provided above the part of the arrangement groove 13 located outside the screw box 11.

A screw distribution mechanism 3 is arranged adjacent to the outer end surface of the arrangement groove 13, and the screw distribution mechanism 3 includes a distribution block 31 having a screw distribution groove 311 and adjacent to the outer end surface of the arrangement groove 13; the distribution block 31 is provided with a screw The receiving block 32, the screw receiving block 32 is provided with two sets of three-way pipelines 321, wherein the upper nozzle 321a is the screw inlet, the lower nozzle 321b is connected to the delivery hose b, and the side nozzle 321c is connected to the blowing pipe; The distribution block 31 is driven by the first cylinder 33 to slide on the screw receiving block 32;

Described screw pressing device 2 comprises screw positioning collet 21 and screw pressing cylinder 22, and the end of cylinder push rod 221 of screw pressing cylinder 22 is provided with plastic punch 222; The tubular body 211 of the rod 221, the side wall of the tubular body 211 is provided with a screw inlet 2110 communicating with the delivery hose b; the front end of the screw positioning chuck 21 is provided with a screw positioning mechanism 23, and the screw positioning mechanism 23 includes symmetrically pivoted Two positioning clips 231 and a return spring 232 are located on both sides of the tubular body 211 , and the positioning clips 231 also have guiding slopes 2310 .

Working principle and process of the present invention are as follows:

First, the screws are placed in the screw box 11, and the screws located in the lower part of the cylindrical space 10 of the screw box 11 are transported to a high place along the inner wall of the cylindrical space 10 under the drive of the radial blades 121 when the longitudinal turntable 12 rotates, and then Under the action of gravity, it falls onto the inclined-plane guide plate 132 at the end of the arrangement groove 13 in the middle of the cylindrical space 10, and under the vibration of the motion inertia and the magnetic oscillator 14, the screw part of the screw falls into the arrangement groove 13, and the screw The head is located above the arrangement groove 13, that is, the screw is positioned in the arrangement groove 13 in a vertical suspension state, and is transported forward under the action of the magnetic oscillator 14; by being positioned at the plastic cover sheet 133 on the arrangement groove 13 outside the screw box 11, The screws whose heads are stacked together can be blocked, so that the screws are neatly arranged and conveyed in the arrangement groove 13; during the above conveying process, there is little friction and collision between the screws, and the vibration feeding process is also very short. Therefore, the phenomenon of falling or scratching of the paint surface of the screw head can be reduced or avoided, and the quality of the screw can be ensured.

When the screw is transported to the other end of the arrangement groove 13, it enters the screw distribution mechanism 3; in the initial state, the screw distribution groove 311 of the distribution block 31 of the screw distribution mechanism 3 docks with the port of the arrangement groove 13, and is located at the screw receiving block 32 The part between the two three-way pipelines 321, the screw distribution groove 311 can only accommodate one screw at a time, the first cylinder 33 drives the distribution block 31 to slide on the screw receiving block 32, when the screw distribution groove 311 slides to a three-way When above the three-way pipeline 321, a screw automatically falls into the three-way pipeline 321 from the upper nozzle 321a and falls into the delivery hose b through the lower nozzle 321b; at this time, the end face of the distribution block 31 blocks the arrangement groove 13 , to ensure that the screws in the arrangement groove 13 do not fall out; then the distribution block 31 slides in reverse, until its screw distribution groove 311 is docked with the arrangement groove 13 again, a screw enters the screw distribution groove 311 again, and the distribution block 31 continues to slide, When the screw distribution groove 311 slides over another set of three-way pipelines 321, the screw falls into another three-way pipeline and then falls into the delivery hose b, and then the distribution block 31 returns to its original position; at this time, the distribution block 31 Block the upper nozzles 321a of the two sets of three-way pipelines 321, then blow air from the external blowing pipe to the side nozzles 321c, and blow the two screws respectively located in the delivery hose b to the screw pressing device 2 Middle; through the above-mentioned screw distributing mechanism 3, one screw feeding device 1 can be used by two screw pressing devices at the same time, which is conducive to improving production efficiency.

The screw enters the tubular body 211 from the screw inlet 2110 on the side of the screw positioning chuck 21 through the delivery hose b, and the screw part of the screw falls between the two positioning clips 231 of the screw positioning mechanism 23, and between the positioning clips 231 The distance between them can be adjusted according to the diameter of the screw rod, so that the screw can be positioned between the two positioning clips 231; after the screw pressing device 2 and the workpiece are aligned accurately, the cylinder push rod 221 of the screw pressing cylinder 22 acts to push the screw into place. Rush forward, the screw head of the screw breaks through the positioning clip 231 along the guide slope 2310 to make the positioning clip 231 separate, so that the screw rushes into the screw hole of the workpiece. After the plastic punch 222 is returned, the positioning clip 231 is in its Under the effect of back-moving spring 232, draw in again, return to original position. The screw is pressed into the device 2, and the end of the cylinder push rod 221 adopts a plastic punch 222, which can play a good role in protecting the paint surface of the screw head, avoiding the paint surface of the screw head from being smashed during the stamping process, and ensuring that the product is intact; Moreover, through the screw positioning mechanism 23, the axis of the screw before punching is kept consistent with the axis of the cylinder punch to ensure accurate screw punching and product quality.

As shown in Fig. 5, as a specific embodiment of the present invention, the automatic screw-pressing equipment is used in linkage with the injection molding machine to press screws into the products taken out from the injection molding machine. It comprises a base frame 4, and this base frame 4 is provided with a set of horizontal slide rails 41 and a set of vertical slide rails 42, wherein, the horizontal slide rails 41 are provided with a workpiece positioning table 43 having a workpiece positioning groove 430, the The workpiece positioning platform 43 is driven by the second cylinder 431 to slide along the horizontal slide rail 41; the vertical slide rail 42 is equipped with a fixed bracket 44, and the screw pressing device 2 is fixedly installed on the fixed bracket 44, and the fixed bracket 44 is driven by the third cylinder 441 installed on the external support to slide along the vertical slide rail 42; the workpiece suction cup 442 is also installed on the fixed support 44. Further, in the above technical solution, the number of workpiece positioning grooves 430 on the workpiece positioning platform 43 is four, and correspondingly, the number of screw pressing devices 2 and workpiece suction cups 442 on the fixing bracket 44 is also four respectively. indivual.

In this embodiment, through reasonable setting of electronic components such as sensors and stroke induction switches, the following automatic screw pressing operation can be realized:

Firstly, place the injection-molded plastic workpiece on the workpiece positioning platform 43 through the manipulator of the injection molding machine and other equipment. When the manipulator returns to its position, the sensor is triggered, and the sensor signal triggers the second cylinder 431 to move, and the second cylinder 431 drives the workpiece positioning platform 43 Move so that the workpiece is located below the fixed bracket 44 and aligns with the screw positioning chuck 21 of the screw press-in device 2 on the fixed bracket 44;

The stroke signal of the second cylinder 431 triggers the action of the third cylinder 441, and the third cylinder 441 drives the fixed bracket 44 to move downward to make the workpiece sucker 442 contact with the workpiece. Hold the workpiece; the vacuum signal after the product is sucked triggers the screw to press into the cylinder 22, and the screw is accurately punched into the screw hole of the workpiece;

Then press the cylinder push rod 221 backstroke of the cylinder 22, and its backstroke signal touches the magnetic force oscillator 14 and the first cylinder 33 of the screw distributing mechanism 3 to act so that the screws fall into the delivery hose b respectively, and then blow to the screw pressing device 2 to wait. Next punching; at the same time, the return signal of the cylinder push rod 221 triggers the third cylinder 441 to reverse the action and lift the fixed bracket 44 upward;

The return signal of the third air cylinder 441 touches the second air cylinder 431 reverse action and pushes the workpiece positioning platform 43 back to the original position to be loaded; The workpiece falls automatically, and the cycle moves like this, so as to realize the automatic production. In this embodiment, the screw pressing operation of four workpieces can be completed at one time, so the production efficiency is greatly improved, and the product quality is guaranteed.

Claims (4)

1. An automatic screw pressing device, comprising a screw feeding device (1) and a screw pressing device (2), is characterized in that: The screw feeding device (1) has a screw box (11), one side of the screw box (11) forms a cylindrical space (10), and a longitudinal turntable (12) with radial blades (121) is installed The end of an arrangement groove (13) formed by two longitudinal side plates (131) stretches into the middle part of the cylindrical space (10), and this end of the longitudinal side plates (131) is also provided with The inclined guide plate (132), the other end of the arrangement groove (13) extends out of the screw box (11) and is connected with a magnetic oscillator (14); A screw distribution mechanism (3) is arranged adjacent to the outer end surface of the arrangement groove (13), and the screw distribution mechanism (3) includes a distribution block having a screw distribution groove (311) and adjacent to the outer end surface of the arrangement groove (13) (31); the bottom of the distribution block (31) is provided with a screw receiving block (32), and the screw receiving block (32) is provided with two groups of three-way pipelines (321), wherein the upper nozzle (321a) is a screw inlet , the lower nozzle (321b) is connected to the delivery hose (b), and the side nozzle (321c) is connected to the air blowing pipe; the distribution block (31) is driven by the first cylinder (33) on the screw receiving block (32) slide up; The screw pressing device (2) includes a screw positioning chuck (21) and a screw pressing cylinder (22), and the end of the cylinder push rod (221) of the screw pressing cylinder (22) is provided with a plastic punch (222) The screw positioning chuck (21) has a tubular body (211) for accommodating the cylinder push rod (221), and the side wall of the tubular body (211) is provided with a screw inlet (2110) communicating with the delivery hose (b); The front end of the screw positioning chuck (21) is provided with a screw positioning mechanism (23), and the screw positioning mechanism (23) includes two positioning clips (231) symmetrically pivoted on both sides of the tubular body (211) and a reset mechanism. The spring (232), the positioning clip (231) also has a guide slope (2310). 2. An automatic screw pressing device according to claim 1, characterized in that: a plastic cover (133) is provided above the part of the arrangement groove (13) located outside the screw box (11). 3. A kind of automatic screw pressing equipment according to claim 1, characterized in that: the automatic screw pressing equipment also includes a base frame (4), and the base frame (4) is provided with a group of horizontal slide rails (41 ) and a set of vertical slide rails (42), wherein, the horizontal slide rail (41) is provided with a workpiece positioning platform (43) with a workpiece positioning groove (430), and the workpiece positioning platform (43) is formed by the second The cylinder (431) drives to slide along the horizontal slide rail (41); the fixed bracket (44) is installed on the vertical slide rail (42), and the screw press-in device (2) is fixedly installed on the fixed bracket (44) and the fixed bracket (44) is driven by the third cylinder (441) to slide along the vertical slide rail (42); the workpiece suction cup (442) is also installed on the fixed bracket (44). 4. A kind of automatic screw pressing equipment according to claim 3, characterized in that: the number of workpiece positioning grooves (430) on the workpiece positioning table (43) is 4, and correspondingly, the fixed bracket ( 44) The number of upper screw press-in device (2) and workpiece sucker (442) is also 4 respectively.

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