A high-precision punch structure for metal cover

Abstract

The invention discloses a high-precision punching machine structure for a metal cover, comprising a punching machine body, a punching table, a lower die, a slider, an upper die, and a crank-connecting rod mechanism. The upper die comprises a first upper block, a second upper block, an upper hole, a shaft, an upper guide column, an upper guide hole, a connecting groove, an upper spring, and an upper ring groove. The lower die comprises a base plate, a lower module, a lower hole, a forming groove, and a lower ring groove. A fixed table is provided in the body and below the punching table. A through hole is provided on the punching table and at a position of the lower die. A base hole corresponding to the position of the lower hole is provided on the base plate. A push rod is provided on the fixed table. A fixing hole for the lower end of the push rod to pass through is provided on the fixed table. A first connecting plate is provided at the lower end of the push rod. A first reset spring is sleeved on the lower end of the push rod. Guide columns extending in a vertical upward direction are provided on both sides of the upper surface of the base plate. Guide sleeves for respectively inserting two guide columns are provided on both sides of the lower end surface of the slider.

Description

Technical Field

[0001] The invention belongs to the technical field of punching machines, and in particular relates to a high-precision punching machine structure for a metal cover. Background Art

[0002] The metal cover is a common industrial product. When processing the metal cover, a punch press is usually used to punch the sheet material to form the shape of the metal cover.

[0003] At present, a Chinese patent with publication number CN207386270U and publication date of May 22, 2018 discloses a punch press that is convenient for fixing workpieces, including a base, a supporting column is fixed on the base, and a motor is installed on one side of the supporting column, a driving wheel is installed at one end of the motor, and the driving wheel is connected to the driven wheel through a belt, the driven wheel is fixed at one end of a crank connecting rod, and a clutch is installed at the other end of the crank connecting rod, a slider is fixed at the bottom end of the crank connecting rod, and an upper mold is installed below the slider, a lower mold is arranged below the upper mold, and an electromagnet is embedded in the top of the lower mold, a workbench is fixed at the bottom end of the lower mold, and a shock-absorbing spring is installed between the workbench and the supporting column, a starting switch is arranged on the other side of the supporting column, and the electromagnet and the motor are electrically connected to the starting switch.

[0004] This type of punching machine that is easy to fix the workpiece uses a motor and a driving wheel to be connected to a driven wheel through a belt. The driven wheel is fixed at one end of a crank connecting rod, and a clutch is installed at the other end of the crank connecting rod. A slider is fixed to the bottom end of the crank connecting rod, and an upper mold is installed under the slider. At this time, the motor can drive the upper mold to move up and down through the crank connecting rod mechanism, and then the required product can be stamped between the upper mold and the lower mold.

[0005] When the upper and lower dies are used to stamp the metal cover, the prior art does not provide a stable and high-precision upper and lower die stamping mechanism for stamping. Therefore, how to achieve stable and high-precision stamping of the metal cover is a difficult problem that needs to be solved urgently. Summary of the invention

[0006] The object of the present invention is to provide a high-precision punch structure for a metal cover, which can perform stable and high-precision punching on the metal cover.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a high-precision punch structure for a metal cover, comprising a punch body, a punching table located at the lower side of the body, a lower mold located on the punching table, a slider connected to the body and located above the lower mold for sliding up and down, an upper mold fixed at the lower end of the slider, a crank-connecting rod mechanism arranged at the upper end of the body and used to drive the slider to slide up and down, the upper mold comprising a first upper block fixed at the lower end surface of the slider, a second upper block located below the first upper block, an upper hole opened at the center of the second upper block, a pressing shaft fixed on the first upper block and used to penetrate into the upper hole, a plurality of upper guide posts arranged on the peripheral side of the upper surface of the second upper block, an upper guide hole opened on the lower surface of the first upper block and for the upper guide posts to be embedded, a plurality of connecting grooves opened on the peripheral side of the upper surface of the second upper block, an upper spring with one end connected to the inner wall of the connecting groove and the other end connected to the lower surface of the first upper block, an upper ring groove opened on the lower surface of the second upper block and located on the peripheral side of the upper hole, the lower mold The tool comprises a base plate fixed on the punching table, a lower module fixed on the upper surface of the base plate, a lower hole opened at the center of the lower module and for the lower end of the pressing shaft to press the plate into, a forming groove opened on the peripheral side of the upper end of the lower hole and for the metal cover to be formed, and a lower ring groove opened on the upper surface of the lower module and located on the peripheral side of the lower hole. A fixed platform is arranged in the body and below the punching table, a through hole is opened on the punching table and at the position of the lower mold, a base hole corresponding to the position of the lower hole is opened on the base plate, a push rod is arranged on the fixed platform and embedded in the lower hole after passing through the through hole and the base hole, a fixing hole is opened on the fixed platform for the lower end of the push rod to pass through, a first connecting plate is arranged at the lower end of the push rod, and a first return spring is sleeved on the lower end of the push rod, the lower end of which is connected to the first connecting plate at the lower end and connected to the lower surface of the fixed platform at the upper end, guide columns extending in the vertical upward direction are arranged on both sides of the upper surface of the base plate, and guide sleeves for respectively inserting two guide columns are arranged on both sides of the lower end surface of the slider.

[0008] By adopting the above technical solution, when the metal cover is stamped and formed, the plate is placed on the lower mold, and then the crank-connecting rod mechanism drives the upper mold to press down through the slider, and the upper mold can press the plate down on the lower mold, wherein as the upper mold continues to press down, the upper spring can be compressed and the second upper block abuts against the first upper block, and the pressing shaft can push the plate into the lower hole, and at the same time, the ejector rod moves downward under the thrust of the pressing shaft, and the first return spring is stretched, at this time, the plate can enter the forming groove under the action of the pressing shaft to complete the stamping and forming, and after the stamping is completed, the crank-connecting rod The mechanism drives the upper mold to move upward through the slider, and the elastic restoring force of the first return spring can push the push rod upward, and the push rod can push the stamped metal cover out of the forming groove, and finally the stamping forming of the metal cover can be completed; when the upper mold and the lower mold are stamped and connected, the guide column on the base plate is embedded in the guide sleeve on the slider. At this time, the upper mold and the lower mold can be positioned by the cooperation of the guide column and the guide sleeve, thereby improving the accuracy of the stamping and connecting of the upper mold and the lower mold, and finally the metal cover can be stamped stably and with high precision.

[0009] The present invention is further configured as follows: positioning columns for contacting the side edges of the plate to be punched are arranged on the upper surface of the lower module and on both sides of the lower hole, a through hole is opened on the lower module that penetrates the lower module and the substrate and for the lower end of the positioning column to pass through, a second connecting plate is arranged at the lower end of the positioning column, and a second return spring is sleeved on the lower end of the positioning column, the lower end of which is connected to the second connecting plate and the upper end is connected to the lower surface of the substrate.

[0010] By adopting the above technical solution, the positioning column is used to position the side of the plate placed on the lower mold, which is conducive to high-precision stamping of the plate; at the same time, when the upper mold is pressed down on the lower mold, the upper mold can push the positioning column to retract into the through hole, and the second return spring is stretched. After the upper mold is removed from the lower mold, the positioning column can be reset under the elastic restoring force of the second return spring, so that it is convenient to re-position the plate through the positioning column during the next stamping.

[0011] The present invention is further configured as follows: the upper end surface of the push rod is a polished surface, the first connecting plate is circumferentially rotatably connected and axially fixedly connected to the lower end of the push rod, and a driving component for driving the push rod to rotate is arranged inside the lower side of the body.

[0012] By adopting the above technical solution, after the metal cover is stamped in the forming groove, the upper mold is kept in a downward pressing state on the lower mold, and then the driving assembly is used to drive the push rod to rotate, and the polishing surface of the upper end face of the push rod can polish the outer wall of the metal cover, thereby completing the polishing of the outer wall of the metal cover during stamping, and finally reducing the burden of subsequent operators on polishing the metal cover.

[0013] The present invention is further configured as follows: a center hole is provided at the center of the first connecting disk for the lower end of the push rod to pass through, an annular groove is provided on the inner wall of the peripheral side of the center hole, and a connecting ring embedded in the annular groove is provided on the peripheral side of the lower end of the push rod.

[0014] By adopting the above technical solution, the push rod is embedded in the annular groove on the circumferential side of the center hole using a connecting ring. At this time, the first connecting disk can be circumferentially rotated and axially fixedly connected to the lower end of the push rod, thereby preventing the rotation of the push rod from driving the first connecting disk and the first return spring to rotate, thereby ensuring a stable connection between the two ends of the first return spring.

[0015] The present invention is further configured as follows: the driving assembly includes a circular groove opened on the upper surface of the fixing table and located at the position of the fixing hole, a rotating block embedded in the circular groove and with four edges on the circumferential side contacting the inner wall of the circular groove, a rod hole opened at the center of the rotating block and for the push rod to pass through, a long groove opened on the side wall of the push rod and extending in the vertical direction, a convex block arranged on the inner wall of the rod hole and embedded in the long groove, four spherical grooves opened on the upper surface of the fixing table and in a hemispherical shape, a fixing arm arranged on the upper side of the fixing table, a mounting hole opened on the fixing arm, and a A clamping column, a spherical end arranged on the lower end surface of the clamping column and used to be embedded in the spherical groove, a third connecting disk arranged on the peripheral side of the clamping column, a third return spring sleeved on the clamping column and connected to the fixed arm at the upper end and the third connecting disk at the lower end, a sliding groove opened on the upper surface of the fixed platform and located on one side of the circular groove, a sliding block embedded in the sliding groove and with a side used to fit the side of the rotating block, and a sliding member arranged on the lower side of the machine body and used to drive the sliding block to slide back and forth in the sliding groove; when the sliding block fits the side of the rotating block, the spherical end abuts against the side of the spherical groove.

[0016] By adopting the above technical solution, when the sliding piece drives the sliding block to move toward the side close to the circular groove, the sliding block can push the rotating block to rotate 90 degrees. After the rotating block rotates, the push rod can be driven to rotate, and when the sliding block is attached to the side of the rotating block, the spherical end contacts the side position of the spherical groove; when the sliding block moves toward the side away from the circular groove and disengages from the side of the rotating block, the elastic restoring force of the third return spring can push the spherical end into the center of the spherical groove. At this time, under the thrust applied by the spherical end to the inner wall of the spherical groove, the rotating block can be deflected so that the center of the spherical groove is aligned with the spherical end; at the same time, after the rotating block is deflected, the angular position of the rotating block can enter the sliding groove, and when the sliding block moves toward the side close to the circular groove next time, the sliding block can continue to push the rotating block to rotate 90 degrees, and so on. The back and forth movement of the sliding block can drive the rotating block and the push rod to rotate continuously.

[0017] The present invention is further configured as follows: the sliding member includes a connecting hole opened on the inner wall at one end of the sliding groove, a connecting rod with one end connected to the end of the sliding block and the other end passing through the connecting hole, a fourth connecting disk arranged on the outer wall of the peripheral side of the connecting rod, a fourth return spring sleeved on the connecting rod and connected to the fourth connecting disk at one end and the outer wall of the fixed platform at the other end, a rotating arm rotatably connected to the lower side of the body at one end and extending outside the body at the other end, a connecting shaft arranged at one end of the rotating arm located in the body, a swing arm arranged at the end of the connecting shaft, and a long strip hole opened at one end of the swing arm away from the connecting shaft and for the connecting rod to pass through.

[0018] By adopting the above technical solution, the operator pushes the rotating arm to rotate downward outside the body, and then the rotating arm can drive the swing arm to swing upward through the connecting shaft. Since the connecting rod passes through the long hole of the swing arm, the swing arm can drive the connecting rod to move toward the sliding groove through the fourth connecting plate, and the fourth return spring is compressed, thereby pushing the sliding block to move toward the side close to the circular groove; and when the operator releases the rotating arm, the elastic restoring force of the fourth return spring can drive the connecting rod to move outside the sliding groove through the fourth connecting plate, thereby pushing the sliding block to move toward the side away from the circular groove, and the rotating arm is reset upward at the same time; in this way, as the operator continues to push the rotating arm downward, the sliding block can be driven to slide back and forth in the sliding groove.

[0019] The present invention is further configured as follows: a pedal is provided at one end of the rotating arm outside the body.

[0020] By adopting the above technical solution, the operator can conveniently drive the rotating arm to continuously rotate downward by stepping on the pedal at the end of the rotating arm.

[0021] The present invention is further configured as follows: an air passage is provided in the positioning column, the lower end of which is connected to the outside world; an air hole is provided at the upper end of the positioning column and on one side close to the push rod; an air groove is provided in the lower module, one end of which is connected to the molding groove and the other end of which is connected to the through hole; when the upper end of the positioning column is pressed into the through hole by the upper mold, the air hole is connected to the air groove, and when the upper end of the positioning column is reset to the upper side of the lower module, the air hole corresponds to the upper surface position of the lower module; an airflow component for inflating and exhausting the air passage is provided on the connecting rod.

[0022] By adopting the above technical scheme, when the upper end of the positioning column is pressed into the through hole by the upper mold, the air hole is connected to the air groove. At this time, the airflow component is used to evacuate the airway, and the air hole can form suction in the forming groove. Therefore, the iron filings accumulated in the forming groove due to the grinding of the metal cover by the push rod can be sucked away, thereby avoiding the accumulation of iron filings in the forming groove; at the same time, when the upper end of the positioning column is reset to the upper side of the lower module, the air hole corresponds to the upper surface position of the lower module. At this time, the airflow component is used to inflate the airway, and the airflow ejected from the air hole can clean the upper surface of the lower mold, thereby ensuring the cleanliness of the stamping environment, which is conducive to precise stamping.

[0023] The present invention is further configured as follows: the airflow component includes a fixed circular plate arranged at one end of the connecting rod away from the sliding block, an airbag arranged on the side of the fixed circular plate away from the connecting rod, a first movable circular plate arranged on the side of the airbag away from the fixed circular plate, a second movable circular plate arranged on the side of the fixed circular plate away from the airbag and pushed by the upper end of the swing arm, a circular hole opened at the center of the second movable circular plate and for the connecting rod to pass through, a plurality of guide straight holes opened on the circumferential side of the fixed circular plate, a plurality of guide cylinders arranged on the circumferential side of the second movable circular plate and connected to the first movable circular plate after passing through the guide straight holes, a fifth return spring sleeved on the connecting rod and connected to the fixed circular plate at one end and the second movable circular plate at the other end, and two air pipes arranged on the airbag, one end of the air pipe is connected to the upper side of the airbag and the other end is connected to the airway at the lower end of the positioning column.

[0024] By adopting the above technical scheme, when the upper end of the positioning column is pressed into the through hole by the upper mold, the air hole is connected with the air groove, and at this time the operator moves the rotating arm upward, so that the rotating arm rotates upward and drives the swing arm to swing toward the side close to the second movable circular plate, and then the swing arm can push the second movable circular plate, and the second movable circular plate can push the first movable circular plate to move toward the side away from the fixed circular plate through the guide cylinder, and the fifth return spring is compressed, and at this time the air bag can be stretched and inflated to form suction, and the suction of the air bag can act in the airway through the air pipe, and finally the air hole can form suction on the forming groove, and the iron filings accumulated in the forming groove due to the grinding of the metal cover by the ejector rod can be sucked away, thereby avoiding the accumulation of iron filings in the forming groove; wherein, since one end of the air pipe is connected to the upper side of the air bag and the other end is connected to the airway at the lower end of the positioning column, the iron filings sucked into the air bag by the air pipe can be stored in the bottom of the air bag under the action of their own gravity, and finally the iron filings can be stably collected by the air bag, and it can be avoided that the iron filings are sprayed out with the air pipe when the air bag is spraying;

[0025] At the same time, when the upper end of the positioning column is reset to the upper side of the lower module, the air hole corresponds to the upper surface position of the lower module. At this time, the operator releases the rotating arm, and then under the elastic restoring force of the fifth reset spring, the second movable circular plate can push the first movable circular plate through the guide cylinder to move toward the side close to the fixed circular plate, so that the airbag is compressed, and the compressed airbag can form a jet airflow in the trachea, thereby inflating the airway, and the airflow ejected from the air hole can clean the upper surface of the lower mold, thereby ensuring the cleanliness of the stamping environment, which is conducive to precise stamping.

[0026] The beneficial effect of the present invention is that when the metal cover is stamped and formed, the plate is placed on the lower mold, and the plate is positioned by using two positioning columns. Then, after the crank connecting rod mechanism drives the upper mold to press down through the slider, the upper mold can press the plate down on the lower mold. As the upper mold continues to press down, the upper spring can be compressed and the second upper block abuts against the first upper block, and the pressing shaft can push the plate into the lower hole. At the same time, the ejector rod moves downward under the thrust of the pressing shaft, and the first return spring is stretched. At this time, the plate can enter the forming groove under the action of the pressing shaft to complete the stamping and forming. After the mold is formed, the crank connecting rod mechanism drives the upper mold to move upward through the slider, and the elastic restoring force of the first return spring can push the ejector rod upward, and the ejector rod can push the stamped metal cover out of the molding groove, and finally the stamping forming of the metal cover can be completed; when the upper mold and the lower mold are stamped and docked, the guide column on the base plate is embedded in the guide sleeve on the slider, and the cooperation of the guide column and the guide sleeve can be used to position the upper mold and the lower mold, thereby improving the precision of the stamping and docking of the upper mold and the lower mold, and finally the metal cover can be stamped stably and with high precision;

[0027] When the metal cover is stamped in the forming groove, the upper mold is kept in the downward pressing state on the lower mold, and then the operator pushes the rotating arm to rotate downward outside the machine body, and the rotating arm can drive the swing arm to swing upward through the connecting shaft. Since the connecting rod passes through the long strip hole of the swing arm, the swing arm can drive the connecting rod to move toward the sliding groove through the fourth connecting plate, and the fourth return spring is compressed, thereby pushing the sliding block to move toward the side close to the circular groove, and the sliding block can push the rotating block to rotate 90 degrees. After the rotating block rotates, it can drive the ejector rod to rotate, and when the sliding block is attached to the side of the rotating block, the spherical end contacts the side position of the spherical groove;

[0028] When the operator releases the rotating arm, the elastic restoring force of the fourth return spring can drive the connecting rod to move toward the outside of the sliding groove through the fourth connecting plate, thereby pushing the sliding block to move toward the side away from the circular groove, and the rotating arm resets upward. When the sliding block moves toward the side away from the circular groove and disengages from the side of the rotating block, the elastic restoring force of the third return spring can push the spherical end into the center of the spherical groove. At this time, under the thrust applied by the spherical end to the inner wall of the spherical groove, the rotating block can be deflected so that the center of the spherical groove is aligned with the spherical end. After the rotation, the corner position of the rotating block can enter the sliding groove, and when the sliding block moves toward the side close to the circular groove next time, the sliding block can continue to push the rotating block to rotate 90 degrees; in this way, as the operator continues to push the rotating arm downward, the sliding block can be driven to slide back and forth in the sliding groove, and the back and forth movement of the sliding block can drive the rotating block and the ejector rod to rotate continuously, and the polishing surface of the upper end surface of the ejector rod can polish the outer wall of the metal cover, thereby completing the polishing of the outer wall of the metal cover while stamping, and finally reducing the burden of subsequent operators on polishing the metal cover;

[0029] When the upper end of the positioning column is pressed into the through hole by the upper mold, the air hole is connected with the air groove, and at this time, the operator moves the rotating arm upward, so that the rotating arm rotates upward and drives the swing arm to swing toward the side close to the second movable circular plate, and then the swing arm can push the second movable circular plate, and the second movable circular plate can push the first movable circular plate to move toward the side away from the fixed circular plate through the guide cylinder, and the fifth return spring is compressed, at this time, the air bag can be stretched and inflated to form suction, and the suction of the air bag can act in the airway through the air pipe, and finally the air hole can form suction on the forming groove, and the iron filings accumulated in the forming groove due to the grinding of the metal cover by the ejector rod can be sucked away, thereby avoiding the accumulation of iron filings in the forming groove; wherein, since one end of the air pipe is connected with the upper side of the air bag and the other end is connected with the airway at the lower end of the positioning column, the iron filings sucked into the air bag by the air pipe can be stored in the bottom of the air bag under the action of their own gravity, and finally the iron filings can be stably collected by the air bag, so as to avoid the iron filings being sprayed out with the air pipe when the air bag is spraying;

[0030] When the upper end of the positioning column is reset to the upper side of the lower module, the air hole corresponds to the upper surface position of the lower module. At this time, the operator releases the rotating arm, and then under the elastic restoring force of the fifth reset spring, the second movable circular plate can push the first movable circular plate to move toward the side close to the fixed circular plate through the guide cylinder, so that the airbag is compressed, and the compressed airbag can form a jet airflow in the trachea, thereby inflating the airway, and the airflow ejected from the air hole can clean the upper surface of the lower mold, thereby ensuring the cleanliness of the stamping environment, which is conducive to precise stamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 is the structural schematic diagram of the present invention;

[0033] Figure 2 is the enlarged partial structure diagram of the slider, guide sleeve and upper die in the present invention;

[0034] Figure 3 is the partial sectional view of the connection relationship between the upper die and the lower die in the present invention in the separated state, at this time the upper die and the lower die are in the separated state;

[0035] Figure 4 is the partial sectional view of the connection relationship between the upper die and the lower die in the present invention in the pressed state, at this time the upper die and the lower die are in the pressed state, and the black part in the shape of "凵" in the forming groove is the metal cover;

[0036] Figure 5 is the enlarged partial view of the connection relationship between the stamping table, lower die, fixed table and rotating arm in the present invention;

[0037] Figure 6 is the enlarged partial view of the connection relationship between the lower die, fixed table, ejector rod, drive assembly and air flow assembly in the present invention;

[0038] Figure 7 is the partial sectional view of the connection relationship between the fixed table, ejector rod and the first connection plate in the present invention;

[0039] Figure 8 is the partial sectional view of the connection relationship between the substrate, lower module, ejector rod, positioning column and air groove in the present invention, at this time the upper end of the positioning column is reset to the upper side position of the lower module, and the air hole corresponds to the upper surface position of the lower module;

[0040] Fig. 9 is the enlarged partial view of the connection relationship between the fixed table, ejector rod and drive assembly in the present invention;

[0041] Fig.10 is the plan view of the fitting state of the connection relationship between the fixed table, rotating block, spherical groove, spherical end, sliding block, connecting rod, swing arm and airbag in the present invention, at this time the sliding block fits on the side of the rotating block and the spherical end abuts against the side position of the spherical groove, and the airbag is in a compressed state;

[0042] Fig.11It is a plan view of the connection relationship between the fixed table, rotating block, spherical groove, spherical end, sliding block, connecting rod, swing arm and airbag in the present invention in a disengaged state. At this time, the sliding block is disengaged from the side of the rotating block, and the rotating block is deflected so that the center of the spherical groove is aligned with the spherical end. At the same time, the swing arm pushes the second movable circular plate to move toward the side close to the airbag, so that the airbag is in an inflated state.

[0043] In the figure, 1, machine body; 11, punching table; 111, through hole; 12, slider; 121, guide sleeve; 13, crank connecting rod mechanism; 2, lower mold; 21, base plate; 211, base hole; 212, guide column; 22, lower module; 221, through hole; 222, air groove; 23, lower hole; 24, forming groove; 25, lower ring groove; 3, upper mold; 31, first upper block; 32, second upper block; 33, upper hole ; 34, pressing shaft; 35, upper guide column; 36, upper guide hole; 37, connecting groove; 38, upper spring; 39, upper ring groove; 4, fixing platform; 42, ejector rod; 421, first connecting plate; 4211, center hole; 4212, annular groove; 422, first return spring; 423, connecting ring; 43, fixing hole; 5, positioning column; 51, second connecting plate; 52, second return spring; 53, airway; 54, air hole; 6, driving assembly; 61, circular groove; 62, rotating block; 63, rod hole; 64, long groove; 65, convex block; 66, spherical groove; 67, fixed arm; 68, mounting hole; 69, clamping column; 601, spherical end; 602, third connecting plate; 603, third return spring; 604, sliding groove; 605, sliding block; 606, sliding member; 6061, connecting hole; 6062, connecting rod; 6063 , fourth connecting plate; 6064, fourth return spring; 6065, rotating arm; 60651, pedal; 6066, connecting shaft; 6067, swing arm; 6068, long hole; 7, airflow component; 71, fixed circular plate; 72, airbag; 73, first movable circular plate; 74, second movable circular plate; 75, round hole; 76, guide straight hole; 77, guide cylinder; 78, fifth return spring; 79, air pipe. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments are described clearly and completely below. 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.

[0045] A high-precision punch structure for metal covers, referring to Figure 1The structure of the high-precision punching machine for metal cover includes a punching machine body 1, a punching table 11, a lower mold 2, a slider 12, an upper mold 3, and a crank-connecting rod mechanism 13, wherein the punching table 11 is fixed to the lower side of the machine body 1 by bolts, and the lower mold 2 is fixed to the punching table 11 by bolts, and the slider 12 is slidably connected to the machine body 1 and is located above the lower mold 2, and the upper mold 3 is fixed to the lower end of the slider 12 by bolts, wherein the crank-connecting rod mechanism 13 is installed at the upper end of the machine body 1 and is used to drive the slider 12 to slide up and down. The crank-connecting rod mechanism 13 is a prior art that mainly includes a motor, a pulley, a belt, a crankshaft and a connecting rod. The crankshaft is driven to rotate by the motor, the pulley and the belt, so that the slider 12 is driven to move up and down by the connecting rod. Since the crank-connecting rod mechanism 13 has been clearly described in the prior art, it is not repeated here.

[0046] Reference Figure 1 , Figure 2 , Figure 3 The upper mold 3 includes a first upper block 31, a second upper block 32, an upper hole 33, a pressing shaft 34, an upper guide column 35, an upper guide hole 36, a connecting groove 37, an upper spring 38, and an upper ring groove 39, wherein the first upper block 31 is fixed to the lower end surface of the slider 12 by bolts, and the second upper block 32 is located below the first upper block 31, and the upper hole 33 is opened at the center of the second upper block 32, and the pressing shaft 34 is welded to the first upper block 31 at the upper end and used to penetrate the upper hole 33 at the lower end, wherein the upper guide column 35 is provided with a plurality of and along the pressing shaft 34 The lower ends of the upper guide posts 35 are welded to the upper surface of the second upper block 32. At the same time, a plurality of upper guide holes 36 are provided on the lower surface of the first upper block 31 and are respectively provided for the insertion of a plurality of upper guide posts 35. A plurality of connecting grooves 37 are provided on the upper surface of the second upper block 32 and are evenly spaced along the circumference of the pressure shaft 34. An upper spring 38 is welded to the inner wall of the connecting groove 37 at one end and to the lower surface of the first upper block 31 at the other end. An upper annular groove 39 is provided on the lower surface of the second upper block 32 and is located around the upper hole 33.

[0047] Reference Figure 4 , Figure 5 , Figure 6 , Figure 7, the lower mold 2 includes a base plate 21, a lower module 22, a lower hole 23, a forming groove 24, and a lower ring groove 25, wherein the base plate 21 is fixed on the punching table 11 by bolts, and the lower module 22 is fixed on the upper surface of the base plate 21 by bolts, and the lower hole 23 is opened at the center of the lower module 22 and is used for the lower end of the pressing shaft 34 to press the plate, and the forming groove 24 is opened on the peripheral side of the upper end of the lower hole 23 and is used for the metal cover to be formed, wherein the lower ring groove 25 is opened on the upper surface of the lower module 22 and is located on the peripheral side of the lower hole 23; at the same time, a fixing table 4 is fixed by bolts in the body 1 and located below the punching table 11, and a through hole 111 is opened on the punching table 11 and located at the position of the lower mold 2, and A base hole 211 corresponding to the position of the lower hole 23 is provided on the base plate 21, wherein a push rod 42 is provided on the fixed platform 4, which passes through the through hole 111 and the base hole 211 and is embedded in the lower hole 23, and a fixing hole 43 is provided on the fixed platform 4 for the lower end of the push rod 42 to pass through, and a first connecting plate 421 is provided at the lower end of the push rod 42, and a first return spring 422 is also sleeved at the lower end of the push rod 42, the lower end of which is welded to the first connecting plate 421 and the upper end is welded to the lower surface of the fixed platform 4; wherein guide columns 212 extending in the vertical upward direction are welded on both sides of the upper surface of the base plate 21, and guide sleeves 121 for respectively allowing two guide columns 212 to penetrate are welded on both sides of the lower end surface of the slider 12.

[0048] Reference Figure 5 , Figure 6 , Figure 7 , Figure 8 , positioning columns 5 for the side edges of the sheet to be punched to abut are arranged on the upper surface of the lower module 22 and on both sides of the lower hole 23, and a through hole 221 is opened on the lower module 22, which penetrates the lower module 22 and the substrate 21 and is provided for the lower end of the positioning column 5 to pass through, wherein the lower end of the positioning column 5 is integrally provided with a second connecting plate 51, and the lower end of the positioning column 5 is sleeved with a second return spring 52, and the lower end of the second return spring 52 is welded to the second connecting plate 51 and the upper end is welded to the lower surface of the substrate 21; wherein the upper end surface of the ejector rod 42 is a polished surface, and the first connecting plate 421 is circumferentially rotatably connected and axially fixedly connected to the lower end of the ejector rod 42, and a center hole 4211 is opened at the center of the first connecting plate 421 for the lower end of the ejector rod 42 to pass through, and an annular groove 4212 is opened on the inner wall of the peripheral side of the center hole 4211, and a connecting ring 423 embedded in the annular groove 4212 is integrally provided on the peripheral side of the lower end of the ejector rod 42.

[0049] Reference Figure 6 , Figure 7 , Fig. 9 , Fig.10A driving assembly 6 for driving the top rod 42 to rotate is arranged on the lower side of the body 1, and the driving assembly 6 includes a circular groove 61, a rotating block 62, a rod hole 63, a long groove 64, a protrusion 65, a spherical groove 66, a fixed arm 67, a mounting hole 68, a clamping column 69, a spherical end 601, a third connecting plate 602, a third return spring 603, a sliding groove 604, a sliding block 605, and a sliding member 606; wherein the circular groove 61 is provided on the upper surface of the fixed platform 4 and is located at the position of the fixed hole 43 The rotating block 62 is embedded in the circular groove 61. The upper and lower surfaces of the rotating block 62 are both square, and the four edges of the rotating block 62 are against the inner wall of the circular groove 61. The rod hole 63 is opened at the center of the rotating block 62 and is passed through by the top rod 42. The long groove 64 is opened on the side wall of the top rod 42 and extends in the vertical direction. The protrusion 65 is integrally arranged on the inner wall of the rod hole 63 and embedded in the long groove 64. The spherical groove 66 is on the fixed table 4. Four spherical grooves 66 are evenly spaced along the circumference of the circular groove 61, and the fixed arm 67 is welded to the upper side of the fixed platform 4 and is in an inverted L shape, and the mounting hole 68 is opened at the upper end of the fixed arm 67, and the upper end of the clamping column 69 passes through the mounting hole 68, and the spherical end 601 is integrally arranged on the lower end surface of the clamping column 69 and is used to be embedded in the spherical groove 66, wherein the third connecting plate 602 is welded to the circumference of the clamping column 69, and the third reset plate 602 is welded to the circumference of the clamping column 69. The spring 603 is sleeved on the clamping column 69, and the upper end of the third return spring 603 is welded to the fixed arm 67 and the lower end is welded to the third connecting plate 602, and the sliding groove 604 is opened on the upper surface of the fixed platform 4 and is located on one side of the circular groove 61, wherein the sliding block 605 is embedded in the sliding groove 604 and the side is used to fit on the side of the rotating block 62, and when the sliding block 605 fits on the side of the rotating block 62, the spherical end 601 abuts against the side position of the spherical groove 66.

[0050] Reference Figure 1 , Figure 6 , Fig. 9 , Fig.10The sliding member 606 is arranged at the lower side of the body 1 and is used to drive the sliding block 605 to slide back and forth in the sliding groove 604. The sliding member 606 includes a connecting hole 6061, a connecting rod 6062, a fourth connecting plate 6063, a fourth reset spring 6064, a rotating arm 6065, a connecting shaft 6066, a swing arm 6067, and a long hole 6068; wherein the connecting hole 6061 is opened on the inner wall at one end of the sliding groove 604, and the connecting rod 6062 is welded to the end of the sliding block 605 at one end and the other end passes through the connecting hole 6061, and the fourth connecting plate 6063 is welded to the outer wall of the peripheral side of the connecting rod 6062, and the fourth reset spring 6064 is sleeved. It is arranged on the connecting rod 6062, wherein one end of the fourth return spring 6064 is welded to the fourth connecting plate 6063 and the other end is welded to the outer wall of the fixed platform 4, and the rotating arm 6065 is rotatably connected to the lower side of the body 1 at one end through a shaft and a bearing and the other end extends to the outside of the body 1, and a pedal 60651 is integrally arranged at the end of the rotating arm 6065 located outside the body 1; at the same time, the connecting shaft 6066 is welded to the end of the rotating arm 6065 located inside the body 1, and the lower end of the swing arm 6067 is welded to the end of the connecting shaft 6066, wherein the long strip hole 6068 is opened at the end of the swing arm 6067 away from the connecting shaft 6066 and is for the connecting rod 6062 to pass through.

[0051] Reference Figure 6 , Figure 8 , Fig.10 , Fig.11, the positioning column 5 is also provided with an air passage 53 whose lower end is connected to the outside, and the upper end of the positioning column 5 and one side close to the ejector rod 42 is provided with an air hole 54, wherein the lower module 22 is provided with an air groove 222 whose one end is connected to the molding groove 24 and the other end is connected to the through hole 221; when the upper end of the positioning column 5 is pressed into the through hole 221 by the upper mold 3, the air hole 54 is connected to the air groove 222, and when the upper end of the positioning column 5 is reset to the upper side of the lower module 22, the air hole 54 corresponds to the upper surface position of the lower module 22; at the same time, The connecting rod 6062 is also provided with an airflow assembly 7 for inflating and exhausting air in the airway 53. The airflow assembly 7 includes a fixed circular plate 71, an airbag 72, a first movable circular plate 73, a second movable circular plate 74, a circular hole 75, a guide straight hole 76, a guide cylinder 77, a fifth return spring 78, and an air pipe 79. The fixed circular plate 71 is welded to the end of the connecting rod 6062 away from the sliding block 605, and the airbag 72 is bonded and fixed to the outer wall of the fixed circular plate 71 on one side away from the connecting rod 6062. The first movable circular plate 73 is bonded to the side of the airbag 72 away from the fixed circular plate 71, and the second movable circular plate 74 is arranged on the side of the fixed circular plate 71 away from the airbag 72 and is pushed by the upper end of the swing arm 6067, and the circular hole 75 is opened at the center of the second movable circular plate 74 and is passed through by the connecting rod 6062, wherein a plurality of guide straight holes 76 are opened on the circumference of the fixed circular plate 71 and are evenly spaced along the circumference of the fixed circular plate 71, and the guide cylinder 77 is arranged on the second movable circular plate 74. There are multiple ones, and one end of the guide cylinder 77 is welded to the second movable circular plate 74 and the other end is welded to the first movable circular plate 73 after passing through the guide straight hole 76, and the fifth return spring 78 is sleeved on the connecting rod 6062, wherein one end of the fifth return spring 78 is welded to the fixed circular plate 71 and the other end is welded to the second movable circular plate 74, and two air pipes 79 are arranged on the airbag 72, and one end of the air pipe 79 is connected to the upper side of the airbag 72 and the other end is connected to the airway 53 at the lower end of the positioning column 5.

[0052] Principle: When the metal cover is stamped, the sheet is placed on the lower die 2, and the sheet is positioned by two positioning columns 5. Then, the crank connecting rod mechanism 13 drives the upper die 3 to press down through the slider 12, and the upper die 3 can press the sheet down on the lower die 2. As the upper die 3 continues to press down, the upper spring 38 can be compressed and the second upper block 32 abuts against the first upper block 31, and the pressing shaft 34 can push the sheet into the lower hole 23. At the same time, the ejector rod 42 moves downward under the thrust of the pressing shaft 34, and the first return spring 422 is stretched. At this time, the sheet can enter the forming groove 24 under the action of the pressing shaft 34 to complete the stamping. After the stamping is completed, the crank connecting rod mechanism 13 is pressed down. The rod mechanism 13 drives the upper mold 3 to move upward through the slider 12, and the elastic restoring force of the first return spring 422 can push the ejector rod 42 upward, and the ejector rod 42 can push the stamped metal cover out of the molding groove 24, and finally the stamping forming of the metal cover can be completed; wherein when the upper mold 3 and the lower mold 2 are stamped and docked, the guide column 212 on the base plate 21 is embedded in the guide sleeve 121 on the slider 12, and at this time, the upper mold 3 and the lower mold 2 can be positioned by the cooperation of the guide column 212 and the guide sleeve 121, thereby improving the precision of the stamping and docking of the upper mold 3 and the lower mold 2, and finally the metal cover can be stamped stably and with high precision;

[0053] When the metal cover is stamped in the forming groove 24, the upper mold 3 is kept in the downward pressing state on the lower mold 2, and then the operator pushes the rotating arm 6065 to rotate downward outside the machine body 1, and the rotating arm 6065 can drive the swing arm 6067 to swing upward through the connecting shaft 6066. Since the connecting rod 6062 passes through the long hole 6068 of the swing arm 6067, the swing arm 6067 can drive the connecting rod 6062 to move toward the sliding groove 604 through the fourth connecting plate 6063, and the fourth return spring 6064 is compressed, thereby pushing the sliding block 605 to move toward the side close to the circular groove 61, and the sliding block 605 can push the rotating block 62 to rotate 90 degrees. After the rotating block 62 rotates, it can drive the ejector rod 42 to rotate, and when the sliding block 605 is attached to the side of the rotating block 62, the spherical end 601 contacts the side of the spherical groove 66.

[0054] When the operator releases the rotating arm 6065, the elastic restoring force of the fourth return spring 6064 can drive the connecting rod 6062 to move toward the outside of the sliding groove 604 through the fourth connecting plate 6063, thereby pushing the sliding block 605 to move toward the side away from the circular groove 61, and at the same time, the rotating arm 6065 resets upward. When the sliding block 605 moves toward the side away from the circular groove 61 and disengages from the side of the rotating block 62, the elastic restoring force of the third return spring 603 can push the spherical end 601 into the center of the spherical groove 66. At this time, under the thrust applied by the spherical end 601 to the inner wall of the spherical groove 66, the rotating block 62 can be deflected so that the center of the spherical groove 66 is aligned with the spherical end 601; at the same time, the rotating block 62 is generated After the deflection, the angular position of the rotating block 62 can enter the sliding groove 604, and when the sliding block 605 moves toward the side close to the circular groove 61 next time, the sliding block 605 can continue to push the rotating block 62 to rotate 90 degrees, and the spherical end 601 enters the next spherical groove 66; in this way, as the operator continues to push the rotating arm 6065 downward, the sliding block 605 can be driven to slide back and forth in the sliding groove 604, and the back and forth movement of the sliding block 605 can drive the rotating block 62 and the push rod 42 to rotate continuously, and the polishing surface of the upper end surface of the push rod 42 can polish the outer wall of the metal cover, thereby completing the polishing of the outer wall of the metal cover during stamping, and finally reducing the burden of subsequent operators on polishing the metal cover;

[0055] At the same time, when the upper end of the positioning column 5 is pressed into the through hole 221 by the upper mold 3, the air hole 54 is connected with the air groove 222, and the operator moves the rotating arm 6065 upward, so that the rotating arm 6065 rotates upward and drives the swing arm 6067 to swing toward the side close to the second movable circular plate 74, and then the swing arm 6067 can push the second movable circular plate 74, and the second movable circular plate 74 can push the first movable circular plate 73 to move toward the side away from the fixed circular plate 71 through the guide cylinder 77, and the fifth return spring 78 is compressed, and the airbag 72 can be stretched and bulged to form suction, and the suction of the airbag 72 can The air pipe 79 acts on the air passage 53, and finally the air hole 54 can form a suction force on the forming groove 24, and the iron filings accumulated in the forming groove 24 due to the grinding of the metal cover by the ejector rod 42 can be sucked away, thereby avoiding the accumulation of iron filings in the forming groove 24; wherein, since one end of the air pipe 79 is connected to the upper side of the air bag 72 and the other end is connected to the air passage 53 at the lower end of the positioning column 5, the iron filings sucked into the air bag 72 by the air pipe 79 can be stored in the bottom of the air bag 72 under the action of their own gravity, and finally the iron filings can be stably collected by the air bag 72, so as to avoid the iron filings being ejected along with the air pipe 79 when the air bag 72 is ejected;

[0056] When the upper end of the positioning column 5 is reset to the upper side of the lower module 22, the air hole 54 corresponds to the upper surface position of the lower module 22. At this time, the operator releases the rotating arm 6065. Then, under the elastic restoring force of the fifth reset spring 78, the second movable circular plate 74 can push the first movable circular plate 73 to move toward the side close to the fixed circular plate 71 through the guide cylinder 77, so that the airbag 72 is compressed, and the compressed airbag 72 can form a blowing airflow in the air pipe 79, thereby inflating the airway 53. The airflow ejected from the air hole 54 can clean the upper surface of the lower mold 2, thereby ensuring the cleanliness of the stamping environment, which is conducive to precise stamping.

Claims

1. A high-precision punching machine structure for a metal cover, comprising a punching machine body (1), a punching table (11) located at the lower side of the punching machine body (1), a lower die (2) located on the punching table (11), a slider (12) connected to the body (1) and located above the lower die (2) for sliding upward and downward movement, an upper die (3) fixed at the lower end of the slider (12), and a crank connecting rod mechanism (13) arranged at the upper end of the body (1) and used for driving the slider (12) to slide upward and downward, characterized in that: The upper mold (3) comprises a first upper block (31) fixed to the lower end surface of the slider (12), a second upper block (32) located below the first upper block (31), an upper hole (33) opened at the center of the second upper block (32), a pressing shaft (34) fixed to the first upper block (31) and used to penetrate into the upper hole (33), a plurality of upper guide posts (35) arranged on the peripheral side of the upper surface of the second upper block (32), an upper guide hole (36) opened on the lower surface of the first upper block (31) and for the upper guide posts (35) to be embedded, a plurality of connecting grooves (37) opened on the peripheral side of the upper surface of the second upper block (32), and an upper spring having one end connected to the inner wall of the connecting groove (37) and the other end connected to the lower surface of the first upper block (31). (38), an upper annular groove (39) opened on the lower surface of the second upper block (32) and located on the circumference of the upper hole (33), the lower mold (2) comprising a base plate (21) fixed on the punching table (11), a lower die block (22) fixed on the upper surface of the base plate (21), a lower hole (23) opened at the center of the lower die block (22) and for the lower end of the pressing shaft (34) to press the plate into, a molding groove (24) opened on the circumference of the upper end of the lower hole (23) and for the metal cover to be molded, and a lower annular groove (25) opened on the upper surface of the lower die block (22) and located on the circumference of the lower hole (23), a fixing table (4) is arranged in the body (1) and below the punching table (11), and the punching table (11) and the lower die block (22) are provided. A through hole (111) is provided at the position of the mold (2); a base hole (211) corresponding to the position of the lower hole (23) is provided on the base plate (21); a push rod (42) is provided on the fixing platform (4) and passes through the through hole (111) and the base hole (211) and is then embedded in the lower hole (23); a fixing hole (43) is provided on the fixing platform (4) for the lower end of the push rod (42) to pass through; a first connecting plate (421) is provided at the lower end of the push rod (42); a first return spring (422) is sleeved at the lower end of the push rod (42) and the lower end of the first return spring is connected to the first connecting plate (421) and the upper end is connected to the lower surface of the fixing platform (4); and two springs extending vertically upward are provided on both sides of the upper surface of the base plate (21). A guide column (212) extending in the direction of the bottom surface of the slider (12), guide sleeves (121) for respectively allowing two guide columns (212) to penetrate are provided on both sides of the lower end surface of the slider (12); positioning columns (5) for contacting the side edges of the sheet to be punched are provided on the upper surface of the lower module (22) and on both sides of the lower hole (23); a through hole (221) penetrating the lower module (22) and the base plate (21) and allowing the lower end of the positioning column (5) to pass through is provided on the lower module (22); a second connecting plate (51) is provided at the lower end of the positioning column (5); and a second return spring (52) is sleeved on the lower end of the positioning column (5), the lower end of which is connected to the second connecting plate (51) and the upper end of which is connected to the lower surface of the base plate (21);The upper end surface of the push rod (42) is a polished surface; the first connecting plate (421) is rotatably connected to the lower end of the push rod (42) in the circumferential direction and is fixedly connected to the lower end of the push rod (42) in the axial direction; a driving assembly (6) for driving the push rod (42) to rotate is provided in the lower side of the body (1); a center hole (4211) is provided at the center of the first connecting plate (421) for the lower end of the push rod (42) to pass through; an annular groove (4212) is provided on the inner wall of the circumferential side of the center hole (4211); and a peripheral side of the lower end of the push rod (42) is provided with a retaining member embedded in the annular groove (4212). The driving assembly (6) comprises a circular groove (61) formed on the upper surface of the fixing platform (4) and located at the position of the fixing hole (43), a rotating block (62) embedded in the circular groove (61) and having four edges on the circumferential side abutting against the inner wall of the circular groove (61), a rod hole (63) formed at the center of the rotating block (62) and through which the push rod (42) passes, a long groove (64) formed on the side wall of the push rod (42) and extending in the vertical direction, and a protrusion (65) provided on the inner wall of the rod hole (63) and embedded in the long groove (64). , four hemispherical spherical grooves (66) opened on the upper surface of the fixing platform (4), a fixing arm (67) arranged on the upper side of the fixing platform (4), a mounting hole (68) opened on the fixing arm (67), a clamping column (69) whose upper end passes through the mounting hole (68), a spherical end (601) arranged on the lower end surface of the clamping column (69) and used to be embedded in the spherical groove (66), a third connecting plate (602) arranged on the peripheral side of the clamping column (69), and a clamping column (69) with its upper end connected to the fixing arm (67) and its lower end connected to the third connecting plate (602). A third return spring (603) connected to the rotating block (62) is provided on the upper surface of the fixed table (4) and is located on one side of the circular groove (61); a sliding block (605) embedded in the sliding groove (604) and having a side for abutting against the side of the rotating block (62); and a sliding member (606) provided on the lower side of the machine body (1) and used for driving the sliding block (605) to slide back and forth in the sliding groove (604); when the sliding block (605) abuts against the side of the rotating block (62), the spherical end (601) abuts against the side of the spherical groove (66);The sliding member (606) comprises a connecting hole (6061) formed on the inner wall at one end of the sliding groove (604), a connecting rod (6062) having one end connected to the end of the sliding block (605) and the other end passing through the connecting hole (6061), a fourth connecting plate (6063) provided on the outer wall of the peripheral side of the connecting rod (6062), and a fourth connecting plate (6063) sleeved on the connecting rod (6062) and having one end connected to the fourth connecting plate (6063) and the other end connected to the outer wall of the fixing platform (4). A return spring (6064), a rotating arm (6065) having one end rotatably connected to the lower side of the machine body (1) and the other end extending to the outside of the machine body (1), a connecting shaft (6066) arranged at one end of the rotating arm (6065) located inside the machine body (1), a swing arm (6067) arranged at the end of the connecting shaft (6066), and a long hole (6068) provided at one end of the swing arm (6067) away from the connecting shaft (6066) and through which the connecting rod (6062) passes. ; 2. A high-precision punching machine structure for metal cover according to claim 1, characterized in that: A pedal (60651) is provided at one end of the rotating arm (6065) located outside the machine body (1).

3. The high-precision punch structure for metal cover according to claim 1, characterized in that: The positioning column (5) is provided with an air passage (53) whose lower end is connected to the outside, and an air hole (54) is provided at the upper end of the positioning column (5) and on a side close to the push rod (42). The lower module (22) is provided with an air groove (222) whose one end is connected to the molding groove (24) and the other end is connected to the through hole (221). When the upper end of the positioning column (5) is pressed into the through hole (221) by the upper mold (3), the air hole (54) is connected to the air groove (222), and when the upper end of the positioning column (5) is reset to the upper side of the lower module (22), the air hole (54) corresponds to the upper surface position of the lower module (22). The connecting rod (6062) is provided with an airflow component (7) for inflating and exhausting air in the air passage (53).

4. A high-precision punching machine structure for metal cover according to claim 3, characterized in that: The airflow assembly (7) comprises a fixed circular plate (71) arranged at one end of the connecting rod (6062) away from the sliding block (605), an air bag (72) arranged on the side of the fixed circular plate (71) away from the connecting rod (6062), a first movable circular plate (73) arranged on the side of the air bag (72) away from the fixed circular plate (71), a second movable circular plate (74) arranged on the side of the fixed circular plate (71) away from the air bag (72) and pushed by the upper end of the swing arm (6067), a circular hole (75) opened at the center of the second movable circular plate (74) and through which the connecting rod (6062) passes, A plurality of guide straight holes (76) opened on the circumferential side of the fixed circular plate (71), a plurality of guide cylinders (77) arranged on the circumferential side of the second movable circular plate (74) and connected to the first movable circular plate (73) after passing through the guide straight holes (76), a fifth return spring (78) sleeved on the connecting rod (6062) and connected to the fixed circular plate (71) at one end and to the second movable circular plate (74) at the other end, and two air pipes (79) arranged on the airbag (72), one end of the air pipe (79) being connected to the upper side of the airbag (72) and the other end being connected to the airway (53) at the lower end of the positioning column (5).

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