Automatic workpiece positioning and correcting device for punching of punching machine

Abstract

The invention relates to the technical field of metal punching, in particular to an automatic workpiece positioning and correcting device for punching of a punching machine, which comprises a sleeve, positioning holes and punching holes, and further comprises a positioning and correcting mechanism and a workpiece conveying mechanism, the positioning holes and the punching holes both penetrate through the sleeve, the positioning holes are distributed in an array, and the punching holes are distributed in an array. The distance between the punching hole and the adjacent positioning hole is equal to the distance of the positioning hole array, and the positioning correction mechanism is located in an inner cavity of the sleeve. According to the punching device, the multiple arrayed positioning holes and the multiple arrayed positioning correction columns are arranged, after punching is completed, the hole distance and the hole site can be corrected through matched contact between the extending positioning correction columns and the inner wall of a punched hole, along with the increase of the number of punched holes, the multiple sets of positioning correction columns fix and limit the hole site while correcting the hole site, and the punching efficiency is improved. Therefore, tiny deviation caused by impact stress during punching of the round pipe workpiece can be avoided, and the accuracy of punching hole positions is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of metal punching, in particular to an automatic workpiece positioning and correction device for punching by a punching machine. Background Art

[0002] Punching machine refers to a stamping press. Punching is a forming method that relies on a press and a die to apply external force to plates, strips, pipes and profiles to cause them to undergo plastic deformation or separation, thereby obtaining workpieces of the desired shape and size. Punching has the advantages of high efficiency, low cost and the ability to adapt to parts with complex shapes.

[0003] The processing contents of punching include blanking (punching, blanking, trimming and cutting, etc.), local forming (flanging, bulging and leveling, etc.), bending and stretching. Different processing contents require different punching equipment. For the punching of pipes, the simplest punching is used.

[0004] When punching holes in long matching round tube workpieces used in some equipment with high assembly requirements, such as laboratory instruments, the hole spacing must be strictly controlled. The existing method is generally infrared positioning, which can achieve precise radial positioning. However, when punching holes in round tube workpieces, due to the effect of punching stress, the round tube workpiece will inevitably produce slight movement. As the number of holes punched increases, the punching position will shift accordingly, thereby affecting the subsequent assembly and matching. For this reason, an automatic positioning and correction device for workpieces used in punching by a punching machine is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic positioning and correction device for workpieces used for punching by a punching machine, which solves the problem of stress offset that is difficult to avoid when punching round tube workpieces using existing positioning and correction equipment. It simultaneously positions and corrects multiple holes and limits them to cope with the punching stress offset and ensure the accuracy of the punching position.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A workpiece automatic positioning and correction device for punching by a punching machine, comprising a sleeve, a positioning hole and a punching hole, and also comprising a positioning and correction mechanism and a workpiece conveying mechanism, wherein the positioning hole and the punching hole both penetrate the sleeve, the positioning holes are arranged in an array, the distance between the punching hole and the adjacent positioning hole is equal to the distance of the positioning hole array, the positioning and correction mechanism is located in the inner cavity of the sleeve, the workpiece conveying mechanism is located at the left end of the sleeve, the positioning and correction mechanism comprises a push rod and a positioning and correction column, the positioning and correction columns are symmetrically distributed in the inner cavity of the sleeve up and down and correspond to the positions of the positioning holes, the push rod is located at the opposite sides of the two groups of positioning and correction columns, and the positioning and correction column is connected to the push rod;

[0008] When the push rod moves to the left and abuts against the workpiece conveying mechanism, the workpiece conveying mechanism expands and clamps the workpiece, and the push rod drives the positioning correction column to retract; when the push rod drives the workpiece conveying mechanism to move right and abuts against the sleeve, the workpiece conveying mechanism contracts, and the push rod drives the positioning correction column to extend.

[0009] In the above scheme, the existing precision-required tube set drilling generally adopts infrared positioning and laser processing, and this method only accurately positions the holes in a radial direction. During the processing of the long tube set, the stress generated by the drilling will cause a slight movement between the long tube sets. As the number of holes drilled increases, the accumulation of slight movements will cause positioning deviation, thereby affecting the subsequent precision matching. This scheme adopts positioning correction for each hole and limits the punched holes during drilling, so as to avoid small deviations when the long tube set is drilled and ensure the accuracy of the drilling.

[0010] Preferably, the positioning and correction mechanism also includes a cylinder, a sliding groove, a first connecting rod, a slider, a pulling spring and an airbag, the cylinder is located on the right side of the push rod, the sliding groove is opened on the left side wall of the positioning and correction column, the slider is located in the inner cavity of the sliding groove, the first connecting rod is located on the left side of the slider, and the two ends of the first connecting rod are respectively connected to the slider and the push rod, the pulling spring is symmetrically distributed front and back on opposite sides of the two positioning and correction columns, the top of the positioning and correction column is conically set, and the cone height is less than the thickness of the sleeve.

[0011] In the above scheme, the shape of the top of the positioning correction column is limited so that it can enter the hole punched by the workpiece without damaging the hole wall, and the height of the tapered part is limited to prevent it from falling out of the positioning hole.

[0012] Preferably, a "U"-shaped limiting push plate is provided on the left side of the push rod, the airbag is located in the inner cavity of the sleeve, and is located in the middle of the punching hole and the "U"-shaped limiting push plate, and a vertically symmetrical blowing nozzle is provided on the left side of the airbag, and the blowing nozzle is obliquely arranged and the oblique direction corresponds to the punching hole.

[0013] In the above scheme, the airbag can be blown after being squeezed during the leftward movement of the push rod, and the blowing direction is limited so that the punching hole can be blown and cleaned to avoid residual punching debris and affect subsequent punching work.

[0014] Preferably, the workpiece conveying mechanism includes a mounting ring, a fixed plate, a moving rod, a limit block, a first return spring, a pull-back block, an arc-shaped clamping block, a limit slide plate, a matching circular plate, a sliding column, a return block, a second connecting rod, a second return spring, a limit slide groove, a connecting column, a limit sleeve, a leg, a separation spring, a limit baffle and a matching hole. The matching circular plate is located on the left side of the "U"-shaped limit push plate, and the mounting ring is located on the left side of the matching circular plate. The second connecting rod is evenly distributed on the left side of the matching circular plate, and the two ends of the second connecting rod are respectively connected to the matching circular plate and the mounting ring. The sliding columns are evenly distributed on the side wall of the mounting ring and The mounting ring is penetrated, the arc-shaped clamping block is connected to the outer end of the sliding column, and the outer ring diameter of the arc-shaped clamping block after shrinkage is smaller than the diameter of the sleeve, the matching hole is penetrated and opened on the left side of the mounting ring, the connecting column is connected to the left center of the matching circular plate, the pull-back block is connected to the left side of the connecting column, the reset block is sleeved on the outer wall of the connecting column, the fixed plates are symmetrically distributed on the left side of the mounting ring front and back, the moving rods are symmetrically arranged and respectively penetrate the two fixed plates, the limit blocks are respectively connected to the opposite ends of the two moving rods, the first reset springs are respectively sleeved on the outer walls of the two moving rods, and the rear sides of the two limit blocks are both obliquely arranged.

[0015] In the above scheme, the outer ring diameter of the arc-shaped clamping block after contraction is limited so that it will not contact the inside of the workpiece during the non-conveying stroke, thereby preventing friction from occurring and avoiding displacement of the workpiece.

[0016] Preferably, the pullback block and the reset block are symmetrically arranged conical cylinders, the limiting sleeve is sleeved on the outer wall of the connecting column and abuts against the reset block, the legs are symmetrically connected to the right side of the limiting sleeve and pass through the limiting slide, the limiting baffle is connected to the left end of the inner cavity of the sleeve, and the separation springs are evenly distributed on the opposite sides of the pullback block and the reset block.

[0017] In the above scheme, when the pull-back block and the reset block are symmetrically arranged conical cylinders, the reset block moves leftward so that the gap between the two limit blocks moving away from each other can allow the pull-back block to come out, and the separation spring is used to separate the pull-back block and the reset block, and to reset the limit sleeve and the support leg.

[0018] Preferably, the limiting slide is evenly distributed on the right side of the mounting ring, the limiting slide groove is evenly distributed on the left side of the sleeve, and the position corresponds to the limiting slide, the second return spring is located in the inner cavity of the limiting slide groove and the left end is connected to the limiting slide, and the length of the limiting slide is equal to the spacing between the positioning holes.

[0019] In the above scheme, the limit slide is limited to ensure the conveying amount of the workpiece, so that the conveying stroke of the workpiece is always equal to the positioning distance, avoiding the positioning correction affected by too short or too long conveying.

[0020] Preferably, the travel distance of the push rod is greater than the height distance of the sliding groove, and the distance between the pull-back block and the reset block is smaller than the height distance of the sliding groove.

[0021] In the above scheme, when the push rod travel distance is greater than the height distance of the sliding groove, the push rod can move up or down with the positioning correction column only after it moves to the limit distance of the sliding groove. The setting of the distance between the pull-back block and the reset block being less than the height of the sliding groove can avoid affecting the positioning correction column when resetting the pull-back block and the reset block, thereby affecting the correction result.

[0022] Preferably, a scraper is provided on the right side of the limiting slide plate, the scraper is provided in a semicircular arc shape, and a working groove is provided at a position corresponding to the scraper and the punching hole.

[0023] In the above scheme, when the push rod moves to the left, the displacement of the workpiece conveying mechanism can drive the scraper to clean up the waste that may remain in the sleeve after punching, so as to avoid interference with subsequent punching.

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

[0025] 1. The present invention provides a plurality of arrays of positioning holes and positioning correction columns. After the punching is completed, the hole spacing and hole positions can be corrected through the cooperation and contact between the extended positioning correction columns and the inner wall of the punched hole. As the number of holes punched increases, multiple groups of positioning correction columns correct the hole positions and fix them at the same time, thereby avoiding slight deviations of the round tube workpiece caused by impact stress during punching and ensuring the accuracy of the hole positions.

[0026] 2. The present invention arranges an airbag and a scraper in the circular tube workpiece. As the push rod moves to the left, the airbag can be squeezed, so that the air outlet facing the punching opening can clean the extruded debris remaining in the punching opening. As it moves to the left, the scraper can scrape off the debris and waste remaining at the bottom of the circular tube workpiece to prevent them from remaining at the punching opening and affecting the subsequent punching work.

[0027] 3. The present invention arranges the conveying equipment inside the workpiece, and the overall structure is sophisticated. For the power mechanism, only one stroke back and forth is required. Compared with the existing multi-stage control of the entire stroke, the power mechanism has lower requirements, and thus it can be adapted to a variety of power mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic structural diagram of the second connecting rod state when the arc-shaped clamping block of the present invention is tightened;

[0031] Figure 3 It is a schematic structural diagram of the second connecting rod state when the arc-shaped clamping block of the present invention is expanded;

[0032] Figure 4 It is a schematic diagram of the structure of the limiting slide plate and the second return spring of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the arc-shaped clamp block of the present invention in a tightened state;

[0034] Figure 6 It is a schematic diagram of the structure of the arc-shaped clamping block of the present invention in an expanded state;

[0035] Figure 7 It is a schematic diagram of the structure of the positioning and correction column when the workpiece conveying mechanism of the present invention is in a state of just abutting against the sleeve;

[0036] Figure 8 It is a schematic diagram of the positioning correction column structure when the pullback block of the present invention is initially separated from the limit block;

[0037] Fig. 9 It is a schematic diagram of the positioning and correction column structure when the pullback block of the present invention is completely separated from the limit block.

[0038] In the figure: 100, sleeve; 101, positioning hole; 102, punching hole; 200, positioning correction mechanism; 201, cylinder; 202, push rod; 203, positioning correction column; 204, sliding groove; 205, first connecting rod; 206, slider; 207, pulling spring; 208, air bag; 209, blowing nozzle; 210, "U"-shaped limit push plate; 300, workpiece conveying mechanism; 301, mounting ring; 302, fixing plate; 303, moving rod ; 304, limit block; 305, first return spring; 306, pull-back block; 307, arc clamping block; 308, limit slide plate; 309, matching circular plate; 310, sliding column; 311, return block; 312, second connecting rod; 313, second return spring; 314, limit slide groove; 315, connecting column; 316, scraper; 317, limit sleeve; 318, support leg; 319, separation spring; 320, limit baffle; 321, matching hole. DETAILED DESCRIPTION

[0039] The following is a more clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, and the described embodiments are only a part of all the embodiments of the present invention. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0040] See also Figures 1 to 9 The present invention provides a workpiece automatic positioning and correction device for punching by a punching machine, and the technical solution is as follows:

[0041] A workpiece automatic positioning and correction device for punching by a punching machine, comprising a sleeve 100, a positioning hole 101 and a punching hole 102, a positioning and correction mechanism 200 and a workpiece conveying mechanism 300, wherein the positioning hole 101 and the punching hole 102 both penetrate the sleeve 100, the positioning holes 101 are arranged in an array, the distance between the punching hole 102 and the adjacent positioning hole 101 is equal to the distance of the positioning hole 101 array, the positioning and correction mechanism 200 is located in the inner cavity of the sleeve 100, the workpiece conveying mechanism 300 is located at the left end of the sleeve 100, the positioning and correction mechanism 200 comprises a push rod 202 and a positioning and correction column 203, the positioning and correction column 203 is symmetrically distributed in the inner cavity of the sleeve 100 and corresponds to the position of the positioning hole 101, the push rod 202 is located on the opposite side of the two groups of positioning and correction columns 203, and the positioning and correction column 203 is connected to the push rod 202;

[0042] When the push rod 202 moves to the left and abuts against the workpiece conveying mechanism 300, the workpiece conveying mechanism 300 expands and clamps the workpiece, thereby driving the workpiece to move synchronously when moving to the right, completing the conveyance of the workpiece. The conveyance inside the workpiece not only reduces the volume of the entire positioning and correction device, but also only requires a movement of an array distance, and has lower requirements for the power equipment. The push rod 202 drives the positioning and correction column 203 to retract; when the push rod 202 drives the workpiece conveying mechanism 300 to move to the right and abuts against the sleeve 100, the workpiece conveying mechanism 300 contracts, and the push rod 202 drives the positioning and correction column 203 to extend; after the positioning and correction column 203 is extended, the column body portion can be fitted with the hole position to correct the position of the hole.

[0043] As an embodiment of the present invention, refer to Figures 6 to 8 The positioning and correction mechanism 200 also includes a cylinder 201, a sliding groove 204, a first connecting rod 205, a slider 206, a pulling spring 207 and an airbag 208. The cylinder 201 is fixedly connected to the right side of the push rod 202, the sliding groove 204 is opened on the left side wall of the positioning and correction column 203, the slider 206 is located in the inner cavity of the sliding groove 204, the first connecting rod 205 is located on the left side of the slider 206, and the two ends of the first connecting rod 205 are respectively hinged to the slider 206 and the push rod 202, and the pulling spring 207 is symmetrically distributed on the opposite sides of the two positioning and correction columns 203. The top of the positioning and correction column 203 is conical, and the conical height is less than the thickness of the sleeve 100. The conical positioning and correction column 203 can quickly enter the hole position during the initial upward movement, and will not cause collision damage to the hole position. The conical part at the top of the positioning and correction column 203 and the impact The cutting hole 102 is detachable, and nano-coating is sprayed on the outer wall of the positioning and correction column 203 and the inner wall of the punching hole 102 to increase the friction resistance of the positioning and correction column 203 and the punching hole 102 and improve the service life; a "U"-shaped limiting push plate 210 is fixedly connected to the left side of the push rod 202, and the air bag 208 is located in the inner cavity of the sleeve 100, and is located in the middle of the punching hole 102 and the "U"-shaped limiting push plate 210. A blow nozzle 209 is fixedly connected to the left side of the air bag 208, which is symmetrical up and down. The blow nozzle 209 is obliquely set and corresponds to the punching hole 102. The air bag 208 can be squeezed by moving the push rod 202 to the left, so that it can be blown through the blow nozzle 209, and the blow nozzle 209 facing the punching hole 102 can blow and clean the punching hole 102 to avoid residual punching debris and affect subsequent punching work.

[0044] As an embodiment of the present invention, refer to Figures 2 to 6The workpiece conveying mechanism 300 includes a mounting ring 301, a fixing plate 302, a moving rod 303, a limiting block 304, a first return spring 305, a pull-back block 306, an arc-shaped clamping block 307, a limiting slide plate 308, a matching circular plate 309, a sliding column 310, a reset block 311, a second connecting rod 312, a second return spring 313, a limiting slide groove 314, a connecting column 315, a limiting sleeve 317, a support leg 318, a separation spring 319, a limiting baffle 320 and a matching hole 321. The matching circular plate 309 is fixedly connected to the left side of the "U"-shaped limiting push plate 210, and the mounting ring 301 is located on the left side of the matching circular plate 309. The second The connecting rod 312 is evenly distributed on the left side of the matching circular plate 309, and the two ends of the second connecting rod 312 are respectively hinged to the matching circular plate 309 and the mounting ring 301, and the sliding column 310 is evenly distributed on the side wall of the mounting ring 301 and penetrates the mounting ring 301. The arc clamping block 307 is fixedly connected to the outer end of the sliding column 310. By moving the matching circular plate 309 to the left, the hinged second connecting rod 312 can be deflected at an angle, thereby driving the connected arc clamping block 307 to expand, and the outer ring diameter of the arc clamping block 307 after contraction is smaller than the diameter of the sleeve 100, and it will not contact the inside of the workpiece during the non-conveying stroke, thereby generating friction, thereby avoiding To avoid driving the workpiece to move, the matching hole 321 is opened on the left side of the mounting ring 301, the connecting column 315 is connected to the left center of the matching circular plate 309, the pull-back block 306 is connected to the left side of the connecting column 315, the reset block 311 is sleeved on the outer wall of the connecting column 315, the fixed plate 302 is symmetrically fixed to the left side of the mounting ring 301, the moving rod 303 is symmetrically arranged and passes through the two fixed plates 302 respectively, the limit blocks 304 are respectively connected to the opposite ends of the two moving rods 303, the first reset springs 305 are respectively sleeved on the outer walls of the two moving rods 303, the rear sides of the two limit blocks 304 are obliquely arranged, and the pull-back block 306 moves to the matching hole The left side of 321 is formed, and the two limit blocks 304 are squeezed to move back to each other until the entire pull-back block 306 is completely located on the left side of the two limit blocks 304, so that the arc clamping block 307 can be limited, thereby realizing the conveying of the workpiece; the pull-back block 306 and the reset block 311 are symmetrically arranged conical cylinders, the limit sleeve 317 is sleeved on the outer wall of the connecting column 315 and abuts against the reset block 311, the support leg 318 is symmetrically connected to the right side of the limit sleeve 317 and passes through the limit slide plate 308, the limit baffle 320 is connected to the left end of the inner cavity of the sleeve 100, and the separation spring 319 is evenly distributed on the opposite sides of the pull-back block 306 and the reset block 311;The leg 318 can move leftward under the action of the limit baffle 320, and at the same time, the connected limit sleeve 317 pushes the reset block 311 to move leftward synchronously, and squeezes the two limit blocks 304 to move back to each other until they contact the pull-back block 306. At this time, the relative limit between the limit block 304 and the mounting ring 301 is no longer maintained, and the second reset spring 313 on the right side of the limit slide 308 pushes it to move leftward, so that the limit block 304 and the pull-back block 306 return to the right side of the matching hole 321. As the limit slide 308 moves leftward and the matching circular plate 309 continues to move rightward, the arc clamping block 307 can be retracted. ;

[0045] As an embodiment of the present invention, refer to Figures 1 to 3 The limiting slide plate 308 is evenly distributed on the right side of the mounting ring 301, and the limiting slide groove 314 is evenly distributed on the left side of the sleeve 100, and the position corresponds to the limiting slide plate 308. The second return spring 313 is located in the inner cavity of the limiting slide groove 314 and the left end is connected to the limiting slide plate 308. The length of the limiting slide plate 308 is equal to the spacing between the positioning holes 101. The conveying stroke is determined by the length of the limiting slide plate 308; the stroke distance of the push rod 202 is greater than the height distance of the sliding groove 204, thereby realizing the positioning and correction of the correction column 2 03's telescopic movement, the distance between the pull-back block 306 and the reset block 311 is smaller than the height distance of the sliding slot 204, so as to avoid interference with the correction work of the positioning correction column 203 when the pull-back block 306 is reset; a scraper 316 is arranged on the right side of the limiting slide 308, and the scraper 316 is arranged in a semicircular arc, and a working groove is provided at the position corresponding to the scraper 316 and the punching hole 102; in the process of the limiting slide 308 moving left, the waste materials that may remain in the sleeve 100 can be cleaned up to avoid interference with the subsequent punching.

[0046] Working principle: This solution takes the left and right movement of the push rod 202 as a motion stroke, and subdivides it into a left movement trigger point, a left movement limit point, a right movement trigger point and a right movement limit point in this motion stroke. Among them, the left movement trigger point is specifically the sliding extension limit point of the limit slide 308, and the right movement trigger point is specifically the sliding retraction limit point of the limit slide 308. The left movement limit point and the right movement limit point are the left and right travel limit points of the push rod 202 respectively. The specific process is as follows:

[0047] Move left to the left trigger point: The original state of this solution is as follows Fig. 9As shown, the round tube workpiece to be punched is sleeved on the outer wall of the sleeve 100 and extended to the punching hole 102 to punch the first hole position (the punched hole position is expressed as a processed hole). After the punching is completed, the round tube workpiece needs to be supported, and the push rod 202 is pushed to the left by the cylinder 201, thereby the push rod 202 and the "U"-shaped limit push plate 210 connected to the push rod 202 are moved to the left, and the matching circular plate 309 connected to the "U"-shaped limit push plate 210 and the mounting ring 301 connected to the matching circular plate 309 through the second connecting rod 312 are moved synchronously with the left movement until the limiting slide plate 308 connected to the mounting ring 301 slides to the limit point of the limiting slide groove 314, and the left movement trigger point is reached at this time. At the same time, when the push rod 202 moves to the left, the first connecting rod 205 is driven to move to the left, and with the movement of the first connecting rod 205, the slider 206 gradually reaches the lowest end of the sliding groove 204;

[0048] The left shift trigger point moves left to the left shift limit point: as the movement from the left shift trigger point to the left shift limit point continues, the positioning correction mechanism 200 and the workpiece conveying mechanism 300 will change: as the push rod 202 continues to move left, the first connecting rod 205 in the positioning correction mechanism 200 will drive the connected slider 206 to move downward, and the slider 206 that has slid to the lowest end of the sliding groove 204 will retract with the positioning correction column 203 until its end falls into the inner cavity of the positioning hole 101 (during the retraction process of the positioning correction column 203, the push rod 202 located in the middle limits it, and its end will not completely separate from the positioning hole 101 when it retracts, such as Figure 7 ); The mounting ring 301 in the workpiece conveying mechanism 300 is limited by the limit slide plate 308 which has slid to the limit length, and as the push rod 202 continues to move left, the "U"-shaped limit push plate 210 which moves synchronously with it pushes the matching circular plate 309 to continue to move left. As the second connecting rod 312 moves, the second connecting rod 312 deflects at an angle, thereby driving the connected arc clamp block 307 to expand outward (such as Figures 2 to 3 ), thereby squeezing and clamping the round tube workpiece from the inside, and at the same time, the pull-back block 306 moves to the left side of the matching hole 321, and squeezes the two limit blocks 304 to move back to each other until the entire pull-back block 306 is completely located on the left side of the two limit blocks 304. At this time, the two limit blocks 304 move towards each other under the action of the first return spring 305, and the limit block 304 is limited to the right. Figure 5 to Figure 6 );

[0049] Move right to the right movement trigger point: after moving to the left movement limit point, the cylinder 201 drives the push rod 202 to move right, thereby the "U"-shaped limit push plate 210 connected to the push rod 202 moves right synchronously, and the pull-back block 306 limited by the two limit blocks 304 is pulled right by the "U"-shaped limit push plate 210 as a whole with the mounting ring 301, the arc-shaped clamping block 307 and the matching circular plate 309, and the round tube workpiece clamped by the arc-shaped clamping block 307 also moves right accordingly, until the right end of the limit slide plate 308 connected to the mounting ring 301 slides back to the limit point of the limit slide groove 314, at which time it reaches the right movement trigger point, and as the push rod 202 moves right The first connecting rod 205 pushes the slider 206 to the top of the sliding groove 204. 2-5 cm before reaching the limit point (the distance is subject to the actual assembly and matching. It is only necessary to ensure that the leg 318 has moved to the left before the limit point and the reset block 311 is in contact with the pull-back block 306). The leg 318 has moved to the left under the action of the limit baffle 320. At the same time, the reset block 311 is pushed to move to the left synchronously through the connected limit sleeve 317, and the two limit blocks 304 are squeezed to move back to each other until they are in contact with the pull-back block 306. The processed hole on the round tube workpiece moves to the top of the adjacent positioning hole 101 as it moves to the right.

[0050] The right shift trigger point moves right to the right shift limit point: as the movement from the right shift trigger point to the right shift limit point continues, the positioning correction mechanism 200 and the workpiece conveying mechanism 300 will change: as the push rod 202 continues to move right, the first connecting rod 205 in the positioning correction mechanism 200 will drive the connected slider 206 to move up, and the slider 206 that has slid to the top of the sliding groove 204 will rise with the positioning correction column 203 until it extends out of the positioning hole 101. As it extends out of the positioning hole 101, the column body part will fit with the processed hole to correct the position of the hole. As the subsequent hole positions increase, the latest punching position can be determined through the positioning correction of multiple holes, and the multiple holes can be inserted and corrected to reduce the vibration offset caused by punching. The limit block 304 and the pull-back block 306 of the workpiece conveying mechanism 300 have been fitted together, and as they fit together and the two limit blocks 304 move, the relative limit between the limit block 304 and the mounting ring 301 is no longer maintained, and the second return spring 313 on the right side of the limit slide 308 will push it to move left, so that the limit block 304 and the pull-back block 306 return to the right side of the matching hole 321, and as the limit slide 308 moves left and the matching circular plate 309 continues to move right, the arc clamping block 307 contracts and no longer squeezes and clamps the round tube workpiece, and the limit block 304 and the pull-back block 306 are separated again under the action of the separation spring 319, thereby completing a stroke, and this stroke is cycled to complete the precise punching positioning and correction work of the multi-hole round tube workpiece.

[0051] The main advantages and working principles of the embodiments of the present invention have been explained above. Then, as a person skilled in the art, it should be understood that the above embodiments are not intended to be limiting conditions of the present invention. Various changes, modifications, substitutions and variations may be made without departing from the principles, spirit and scope of the invention. These changes, modifications, substitutions and variations should all fall within the scope of protection of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A workpiece automatic positioning and correction device for punching by a punching machine, comprising a sleeve (100), a positioning hole (101) and a punching hole (102), characterized in that: The invention also comprises a positioning correction mechanism (200) and a workpiece conveying mechanism (300), wherein the positioning hole (101) and the punching hole (102) both penetrate the sleeve (100), the positioning holes (101) are arranged in an array, the distance between the punching hole (102) and the adjacent positioning hole (101) is equal to the distance of the positioning hole (101) array, the positioning correction mechanism (200) is located in the inner cavity of the sleeve (100), and the workpiece conveying mechanism (300) is arranged in an inner cavity of the sleeve (100). The mechanism (300) is located at the left end of the sleeve (100), and the positioning and correction mechanism (200) comprises a push rod (202) and a positioning and correction column (203). The positioning and correction column (203) is symmetrically distributed in the inner cavity of the sleeve (100) and corresponds to the position of the positioning hole (101). The push rod (202) is located on the opposite side of the two groups of positioning and correction columns (203), and the positioning and correction column (203) is connected to the push rod (202); When the push rod (202) moves to the left and abuts against the workpiece conveying mechanism (300), the workpiece conveying mechanism (300) expands and clamps the workpiece, and the push rod (202) drives the positioning correction column (203) to retract; when the push rod (202) drives the workpiece conveying mechanism (300) to move to the right and abuts against the sleeve (100), the workpiece conveying mechanism (300) contracts, and the push rod (202) drives the positioning correction column (203) to extend.

2. The automatic positioning and correction device for workpieces used for punching by a punching machine according to claim 1, characterized in that: The positioning and correction mechanism (200) also includes a cylinder (201), a sliding groove (204), a first connecting rod (205), a slider (206), a pulling spring (207) and an airbag (208), wherein the cylinder (201) is located on the right side of the push rod (202), the sliding groove (204) is opened on the left side wall of the positioning and correction column (203), the slider (206) is located in the inner cavity of the sliding groove (204), the first connecting rod (205) is located on the left side of the slider (206), and the two ends of the first connecting rod (205) are respectively connected to the slider (206) and the push rod (202), the pulling spring (207) is symmetrically distributed on the opposite sides of the two positioning and correction columns (203), and the top of the positioning and correction column (203) is conical, and the height of the cone is less than the thickness of the sleeve (100).

3. The automatic positioning and correction device for workpieces used for punching by a punching machine according to claim 2, characterized in that: A "U"-shaped limiting push plate (210) is arranged on the left side of the push rod (202); the air bag (208) is located in the inner cavity of the sleeve (100) and in the middle of the punching hole (102) and the "U"-shaped limiting push plate (210); a blowing nozzle (209) symmetrical in upper and lower directions is arranged on the left side of the air bag (208); the blowing nozzle (209) is arranged obliquely and corresponds obliquely to the punching hole (102).

4. The automatic positioning and correction device for workpieces used for punching by a punching machine according to claim 3, characterized in that: The workpiece conveying mechanism (300) comprises a mounting ring (301), a fixing plate (302), a moving rod (303), a limiting block (304), a first return spring (305), a pull-back block (306), an arc-shaped clamping block (307), a limiting slide plate (308), a matching circular plate (309), a sliding column (310), a return block (311), a second connecting rod (312), a second return spring (313), a limiting slide groove (314), a connecting column (315), a limiting sleeve (316), and a second connecting rod (317). 17), a support leg (318), a separation spring (319), a limit baffle (320) and a matching hole (321), the matching circular plate (309) is located on the left side of the "U"-shaped limit push plate (210), the mounting ring (301) is located on the left side of the matching circular plate (309), the second connecting rod (312) is evenly distributed on the left side of the matching circular plate (309), and the two ends of the second connecting rod (312) are respectively connected to the matching circular plate (309) and the mounting ring (301), the sliding column (310) is evenly distributed on the side wall of the mounting ring (301) and penetrates the mounting ring (301), the arc-shaped clamping block (307) is connected to the outer end of the sliding column (310), and the outer ring diameter of the arc-shaped clamping block (307) after shrinkage is smaller than the diameter of the sleeve (100), the matching hole (321) is penetrated and opened on the left side of the mounting ring (301), the connecting column (315) is connected to the left center of the matching circular plate (309), and the pull-back block (306) is connected to the left side of the connecting column (315). On the side, the reset block (311) is sleeved on the outer wall of the connecting column (315), the fixed plate (302) is symmetrically distributed front and back on the left side of the mounting ring (301), the moving rod (303) is symmetrically arranged and passes through the two fixed plates (302) respectively, the limit blocks (304) are respectively connected to the opposite ends of the two moving rods (303), the first reset springs (305) are respectively sleeved on the outer walls of the two moving rods (303), and the rear sides of the two limit blocks (304) are both obliquely arranged.

5. The automatic positioning and correction device for workpieces used for punching by a punching machine according to claim 4, characterized in that: The pull-back block (306) and the reset block (311) are symmetrically arranged conical cylinders, the limiting sleeve (317) is sleeved on the outer wall of the connecting column (315) and abuts against the reset block (311), the supporting leg (318) is symmetrically connected to the right side of the limiting sleeve (317) and passes through the limiting slide plate (308), the limiting baffle (320) is connected to the left end of the inner cavity of the sleeve (100), and the separation spring (319) is evenly distributed on the opposite sides of the pull-back block (306) and the reset block (311).

6. The automatic positioning and correction device for workpieces used for punching by a punching machine according to claim 5, characterized in that: The limiting slide plate (308) is evenly distributed on the right side of the mounting ring (301), the limiting slide groove (314) is evenly distributed on the left side of the sleeve (100), and its position corresponds to the limiting slide plate (308), the second return spring (313) is located in the inner cavity of the limiting slide groove (314) and its left end is connected to the limiting slide plate (308), and the length of the limiting slide plate (308) is equal to the spacing between the positioning holes (101).

7. The automatic positioning and correction device for workpieces used for punching by a punching machine according to claim 1, characterized in that: The travel distance of the push rod (202) is greater than the height distance of the sliding groove (204), and the distance between the pull-back block (306) and the reset block (311) is less than the height distance of the sliding groove (204).

8. The automatic positioning and correction device for workpieces used for punching by a punching machine according to claim 1, characterized in that: A scraper (316) is arranged on the right side of the limiting slide plate (308); the scraper (316) is arranged in a semicircular arc, and a working groove is provided at a position corresponding to the scraper (316) and the punching hole (102).

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