Urea kettle down-blowing device

Abstract

The urea kettle downward blowing device comprises a rack, a first blowing needle, a first metal insert and a synchronizing mechanism, the first metal insert is provided with a mounting opening, a plurality of metal tooth-shaped blocks which are evenly distributed in the circumferential direction are arranged on the inner side wall of the mounting opening, a pressing block abuts against the metal tooth-shaped blocks, and the synchronizing mechanism has a first state and a second state. In the first state, the first synchronizing part and the second synchronizing part are connected and rotate relatively; and in the second state, the first synchronous part and the second synchronous part are connected and rotate synchronously, and when the first blowing needle is separated from the first metal insert, the first blowing needle is gradually switched to the second state from the first state. In the process that the first blowing needle is gradually switched from the first state to the second state under the action of the synchronizing mechanism, the rotating torque is gradually increased, so that the acting force borne when the rotating torque is transmitted to the first metal insert is also gradually increased, a gap generated at the joint of the first metal insert and a material due to instantaneous stress can be reduced, and the forming quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of blow molding related devices, and in particular to a urea kettle bottom blowing device. Background Art

[0002] Urea jugs are used on diesel locomotives, such as some large trucks. The urea solution they contain reacts with nitrogen oxides in exhaust gas, treating vehicle exhaust. Urea jugs are formed using blow molding, similar to many other hollow plastic containers on the market. However, due to the jug's structural characteristics, the blow needle of the down-blowing mechanism requires a metal insert during the blow molding process. This metal insert is then blow-molded together with the plastic jug body.

[0003] For example, the "SCR urea tank for diesel engine exhaust aftertreatment" disclosed by the authorization announcement number CN203050857U has a ventilation valve installation port, a sensor installation port and a urea filling port on its tank body, wherein the sensor installation port and the filling port both have metal inserts. The sensor installation port needs to be docked with the vehicle sensor. In order to achieve quick disassembly while ensuring reliability after docking, the insert in the sensor installation port has a special snap-fit ​​structure. Referring to the "bandage-type urea tank" disclosed by CN202946219U, the insert placed in the sensor installation port has a plurality of circumferentially evenly distributed metal toothed rings at the outer edge of the opening, and the corresponding vehicle sensor connector also has a plurality of clamping blocks. During the docking process, the clamping block passes through the gap between the two adjacent metal toothed rings and rotates an angle to complete the abutment with the surface of the metal toothed ring. The operation process is similar to the rotating clamping structure.

[0004] In the prior art, when the insert is connected to the plastic material, the insert needs to be connected to the blow needle. After blow molding, the insert is connected to the material. During the demolding process, the blow needle needs to rotate in the opposite direction by a certain angle to disengage it from the metal toothed ring of the insert before it can exit the blow needle. During this process, since the plastic material has not completely cooled, the insert has not reached a state of complete solidification after being connected to the material. When the blow needle rotates and separates relative to the insert, the insert is simultaneously subjected to a torque generated by the circumferential force squeezed by the blow needle. This circumferential torque will cause a certain rotational force between the insert and the plastic material that has not been completely cooled and solidified. The greater the circumferential torque, the easier it is for the gap between the insert and the material to increase. After the product is formed, there is a certain amount of movement space in the insert, which affects the molding quality. Summary of the Invention

[0005] In order to gradually increase the circumferential torque exerted on the insert during the separation of the blow needle and the insert and avoid the generation of huge rotational force between the insert and the incompletely cooled material due to instantaneous circumferential torque transmission, thereby improving the molding quality, the present application provides a urea kettle bottom blowing device.

[0006] The present application provides a urea kettle downward blowing device adopting the following technical solution: A urea kettle downward blowing device, comprising: frame; A first blow needle is mounted on the frame, wherein the first blow needle has a plurality of circumferentially uniformly distributed pressing blocks extending outward at an outer peripheral wall of an end portion; a first metal insert detachably connected to the end of the first blow needle, the first metal insert having a mounting opening, the mounting opening having a plurality of circumferentially evenly distributed metal tooth blocks disposed on an inner sidewall thereof, the pressing block abutting against the metal tooth blocks; and a synchronization mechanism comprising a first synchronization member and a second synchronization member connected to the first blow needle, wherein the first synchronization member and the first blow needle can rotate synchronously, and the second synchronization member can rotate / axially slide relative to the first blow needle; Among them, all synchronization mechanisms have a first state and a second state. In the first state, the first synchronization member is connected to the second synchronization member and the two rotate relative to each other; in the second state, the first synchronization member is connected to the second synchronization member and the two rotate synchronously. When the first blow needle is separated from the first metal insert, it gradually switches from the first state to the second state.

[0007] By adopting the above technical solution, after the blow molding is closed, the first metal insert is connected with the plastic material, and the first blow needle and the first metal insert are pre-connected by abutting the metal tooth block through the pressure block. When the first blow needle is demolded, the synchronization mechanism is used to make the first synchronization member and the second synchronization member connected to the first blow needle interact with each other, and gradually switch from the first state of the synchronization mechanism to the second state. When entering the first state, the second synchronization member is connected to the first synchronization member but the two are in relative rotation. During this process, since the first synchronization member does not rotate synchronously with the second synchronization member, but the two have a certain connection relationship, the first synchronization member is subjected to the rotational force of the second synchronization member, and the rotational force is transmitted to the first metal insert to generate a certain rotational starting force. Subsequently, when gradually switching to the second state, the second synchronization member drives the first synchronization member to rotate synchronously. At this time, the first blow needle rotates relative to the first metal insert and gradually starts to demold, effectively overcoming the existing problem that the first metal insert generates a large rotational force due to instantaneous torque, which affects the molding quality.

[0008] Preferably, the synchronization mechanism further includes a clutch assembly, and the clutch assembly includes: a toothed disc connected to one end of the second synchronizer, the toothed disc having a plurality of teeth uniformly distributed circumferentially on an end surface thereof; A plurality of clutch posts connected to one end of a first synchronizer, wherein a guide hole is formed at the end of the first synchronizer, the clutch posts are slidably connected in the guide hole and the ends of the clutch posts extend out of the guide hole; and An elastic member is disposed in the guide hole and contacts the clutch column, and is used to always force the clutch column to have a movement tendency to separate from the guide hole; In the first state, the end of the clutch column contacts the gear disc, and the clutch column can slide along the tooth surface of several teeth; in the second state, the clutch column contacts the side wall of one of the teeth and the two are relatively stationary.

[0009] By adopting the above technical solution, when the first blow needle is in the first state, the clutch column is used to slide on several teeth of the gear disk, and the several teeth form an undulating tooth surface. When the clutch column slides on the tooth surface, it can generate intermittent extrusion force, which is gradually transmitted to the first blow needle, thereby realizing intermittent force on the first metal insert. This process is similar to generating a vibration of a certain frequency, so that the first blow needle and the first metal insert are smoother when they are initially rotated and separated, just like first generating a certain amount of looseness between the first blow needle and the first metal insert. After switching from the first state to the second state, the extrusion force of the clutch column and one of the teeth drives the synchronous rotation of the first synchronizer and the second synchronizer to realize rotational separation from the first metal insert, thereby better realizing the effect of slow demolding and improving the molding quality.

[0010] Preferably, the clutch assembly further includes a cover, which is connected to the first synchronizer, and the cover also has an adjustment port for the clutch column to pass through, and the adjustment port is connected to the guide hole; wherein, the cover can rotate relative to the first synchronizer to force the clutch column to apply a force to the elastic member to increase / decrease its stiffness.

[0011] By adopting the above technical solution, when the cover rotates with the first synchronizer, it can drive the clutch column to act on the elastic part. When the stiffness of the elastic part increases, the sliding friction of the clutch column on the tooth surface becomes greater, and the starting force transmitted to the first metal insert becomes greater, and vice versa. This allows products with different demolding force requirements to be demolded after blow molding.

[0012] Preferably, the clutch column includes: a first column, one end of which extends into the guide hole and contacts the elastic member; A second column, one end of which extends from the adjustment opening toward one side of the gear disc; and A limiting ring connects the first column and the second column, wherein the limiting ring contacts the cover; The limiting ring always contacts the cover, and when the cover rotates relative to the first synchronous member, a force is applied to the limiting ring to force the clutch column to move in the guide hole.

[0013] By adopting the above technical solution, the first column is set as a sliding guide for the clutch column and can slide in the guide hole; the second column is mainly connected to the tooth surface, and the limiting ring contacts the cover to limit the clutch column from disengaging from the guide hole. At the same time, by applying force to the limiting ring, the clutch column can be driven to move along the guide hole, thereby playing a better role in adjusting the stiffness of the elastic part.

[0014] Preferably, the cover is further provided with a plurality of circumferentially uniformly distributed first force blocks at the outer edge, and a limiting area is formed between two adjacent first force blocks, and the gear disk further includes a second force block; wherein, when the synchronization mechanism is in the process of switching from the first state to the second state, the second force block extends into the limiting area and may conflict with the side wall of one of the first force blocks.

[0015] By adopting the above technical solution, the limiting area limits the travel distance required to switch from the first state to the second state. At the same time, when entering the second state, when the second force block conflicts with the first force block, the second synchronizer and the first synchronizer can be rotated synchronously. The conflict between the second force block and the first force block serves as the bottom line for the synchronization mechanism to enter the second state. When the clutch column completely conflicts with one of the teeth, it can also enter the second state, thereby ensuring the final demolding and demolding stability.

[0016] Preferably, the synchronization mechanism further comprises: a rotation drive assembly, the rotation drive assembly comprising a first motor and a first ball nut driven to rotate by the first motor; and A lifting drive assembly, the lifting drive assembly comprising a second motor and a second ball nut driven to rotate by the second motor; Among them, the second synchronizer is provided with a spiral groove and a plurality of key grooves opened along the axial direction on the outer peripheral wall, the first ball nut and the spiral groove form a first ball nut screw pair, and the second ball nut and the plurality of key grooves form a second ball nut screw pair; the first ball nut screw pair is used to drive the second synchronizer to displace along the axial direction of the first blow needle, and the second ball nut screw pair is used to drive the second synchronizer to rotate relative to the first blow needle.

[0017] By adopting the above technical solution, the second synchronizer can be moved away from or toward one end of the first synchronizer before connecting with the first synchronizer, and the second synchronizer can be driven by the rotary drive assembly to rotate relative to the first blow needle. Before the synchronization mechanism enters the first state, the lift drive assembly drives the second synchronizer toward the first synchronizer to achieve connection. During the transition from the first state to the second state, and when entering the second state, the lift drive assembly and the rotary drive assembly work synchronously, causing the second synchronizer to rotate while approaching one side of the first synchronizer. The spiral grooves and multiple axial keyways on the outer peripheral wall of the second synchronizer, combined with the independent drive of the first and second ball nuts, enable flexible operation and a simplified structure.

[0018] Preferably, it also includes: An adjustment frame, rotatably connected to the frame; A first driving member connected to the adjustment frame; a second blow needle connected to the driving member; and a second metal insert connected to the second blow needle; When the adjustment frame rotates relative to the frame, the tilt angle between the axis of the second blow needle and the horizontal plane is adjusted.

[0019] By adopting the above technical solution, after the second metal insert is connected to the second blow needle, it is retained in the filling port after molding. Since the filling port does not need to be connected to an external component and is only a hole, after the second metal insert is connected to the material, the first driving member drives the second blow needle to directly detach, and the setting of the adjustment frame facilitates the adjustment of the inclination angle of the filling port.

[0020] Preferably, the second blow needle has a convex ring extending outward, the second metal insert has a limiting hole and a limiting groove connected to the limiting hole, the second blow needle partially extends into the limiting hole and the convex ring abuts against the limiting groove; wherein, the second blow needle is also provided with at least one limiting block on the outer peripheral wall, and the second metal insert is also provided with a limiting opening connected to the limiting hole, the limiting block is partially accommodated in the limiting opening and can slide circumferentially in the limiting opening.

[0021] By adopting this technical solution, when the second metal insert is connected to the second blow needle, the second blow needle enters the limiting hole, and the protruding ring abuts against the limiting groove to limit the axial displacement of the second metal insert and the second blow needle. At the same time, the limiting block partially engages the limiting opening to inhibit relative rotation between the second metal insert and the second blow needle.

[0022] Preferably, it also includes: Ventilation hole forming rod; and The moving mechanism includes a first slide, a second slide, a guide column, a second drive member and a third drive member. The guide column is connected to the frame. The first slide and the second slide are both slidably connected to the guide column. The second drive member and the third drive member are both installed on the frame. The second drive member is connected to the first slide, and the third drive member is connected to the second slide. The adjustment frame is installed on the first slide, and the ventilation hole forming rod is connected to the second slide.

[0023] By adopting the above technical solution, the ventilation hole forming rod is used to form the ventilation hole of the urea kettle. The moving mechanism independently controls the positions of the first slide and the second slide through the second driving member and the third driving member, thereby adjusting the relative position of the second blow needle and the ventilation hole forming rod on the frame, thereby increasing the scope of application.

[0024] Preferably, it further comprises a lifting mechanism connected to the frame, and the lifting mechanism is used to drive the frame to move up and down.

[0025] By adopting the above technical solution, after the first blow needle is rotated and separated from the first metal insert, the lifting mechanism drives the frame connected to the first blow needle to descend and achieve complete separation. Before blow molding, the corresponding blow needle needs to be lifted to the molding position.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. As the first blow pin switches from the first state to the second state under the action of the synchronization mechanism, the rotational torque gradually increases, and the force applied to the first metal insert also gradually increases. This can reduce the gap between the first metal insert and the material due to the instantaneous force, thereby improving the molding quality. 2. Through the arrangement of the clutch assembly, when the first blow needle is in the first state, the interstitial force generated by the clutch column sliding along the teeth further overcomes the static friction between the first blow needle and the first metal insert during relative rotation, resulting in a certain degree of looseness between the first blow needle and the first metal insert. After entering the second state, the first blow needle can quickly and smoothly achieve rotational separation from the first metal insert. 3. By rotating the cover relative to the first synchronizer, the clutch column is exerted with a force on the elastic member to change the stiffness, thereby adjusting the force exerted by the first blow needle on the first metal insert in the first state to adapt to demoulding under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of the urea kettle down-blowing device; Figure 2 It is a schematic diagram mainly showing the connection between the first blow needle and the synchronization mechanism; Figure 3It is a schematic diagram mainly showing the connection between the second blow needle and the air exchange hole forming rod; Figure 4 This is a schematic diagram of the connection between the urea pot and the down-blowing device after forming; Figure 5 is a schematic diagram of the connection between the first metal insert and the first blow needle; Figure 6 is an exploded schematic diagram of the first metal insert and the first blow needle; Figure 7 It is a schematic diagram mainly showing the connection between the first synchronizer and the second synchronizer; Figure 8 It is a connection diagram of the clutch assembly; Figure 9 It is an exploded schematic diagram mainly showing the connection between the cover and the clutch column of the clutch assembly; Figure 10 It is a schematic diagram mainly showing the structure of the adjustment frame; Figure 11 is an exploded schematic diagram of the second blow needle and the second metal insert at one viewing angle; Figure 12 is an exploded schematic diagram of the second blow needle and the second metal insert from another perspective; Figure 13 It is a structural diagram of the lifting mechanism.

[0028] Explanation of reference numerals: 10, frame; 11, bearing seat; 20, first blow needle; 21, pressure block; 22, slot; 30, synchronization mechanism; 31, first synchronization member; 311, cover; 3111, receiving groove; 3112, adjustment port; 312, first force block; 313, limiting area; 314, clutch column; 3141, first column; 3142, second column; 3143, limiting ring; 315, elastic member; 316, guide hole; 32, second synchronization member ; 321, toothed disc; 3211, teeth; 3212, tooth surface; 322, spiral groove; 323, keyway; 324, second force block; 33, first ball nut; 331, first driven pulley; 34, second ball nut; 341, second driven pulley; 35, first motor; 36, second motor; 37, first driving pulley; 38, second driving pulley; 39, synchronous belt; 40, filling port forming mechanism; 41, adjustment frame; 411, support plate; 411 1. Connecting hole; 4112. First locking hole; 412. Top plate; 413. Bottom plate; 414. Guide rod; 415. Adjusting member; 4151. Adjusting hole; 42. Second blow needle; 421. Raised ring; 422. Stopper; 423. Connecting seat; 4231. Second locking hole; 43. Second metal insert; 431. Stopper hole; 432. Stopper groove; 433. Stopper opening; 44. First driving member; 50. First metal insert; 51. Metal toothed block; 60 , moving mechanism; 61, first slide; 62, second slide; 63, guide column; 64, second driving member; 65, third driving member; 70, urea pot; 71, pot wall; 711, mounting port edging; 72, sensor mounting port; 73, filling port; 74, ventilation hole; 80, lifting mechanism; 81, mounting plate; 82, transmission box; 83, worm; 84, worm wheel; 85, screw; 86, lifting rod; 87, end cover; 88, fastener; 90, ventilation hole forming rod. DETAILED DESCRIPTION

[0029] The present application is further described in detail below with reference to the accompanying drawings.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Figures 1 to 4 The structure of a urea pot downward blowing device is shown, which is applied to the blow molding of a urea pot 70. It is used to form the filling port 73, the sensor installation port 72 and the ventilation hole 74 in the urea pot 70. At the same time, during the molding process, air is blown into the cavity inside the urea pot 70 to keep the interior hollow.

[0033] The down-blowing device comprises a frame 10, a filling port molding mechanism 40 mounted on the frame 10, a first blow needle 20, and a ventilation hole molding rod 90. The first blow needle 20 is positioned between the filling port molding mechanism 40 and the ventilation hole molding rod 90. A first metal insert 50 is connected to the end of the first blow needle 20. After molding, the first metal insert 50 is positioned within the sensor mounting port 72 of the urea tank 70. A synchronization mechanism 30 is also connected to the first blow needle 20 to disengage the first blow needle 20 from the first metal insert 50 after molding.

[0034] The filling port molding mechanism 40 includes an adjusting frame 41 and a second blow needle 42 mounted on the adjusting frame 41. One end of the second blow needle 42 is connected to a second metal insert 43. After molding, the second metal insert 43 is reserved in the filling port 73 of the urea pot 70. One end of the ventilation hole molding rod 90 is directly used as an insert to mold the ventilation hole 74 of the urea pot 70.

[0035] In this downblowing device, a moving mechanism 60 is further provided on the frame 10, and the moving mechanism 60 is used to adjust the horizontal position of the filling port forming mechanism 40 and the ventilation hole forming rod 90 relative to the frame 10, thereby adapting to the requirements of different forming port positions. Specifically, the moving mechanism 60 includes a first slide 61, a second slide 62, a guide column 63, a second drive member 64 and a third drive member 65. The guide column 63 has two ends connected to the frame 10. The first slide 61 and the second slide 62 are both slidingly connected to the guide column 63. The second drive member 64 is connected to the first slide 61. The third drive member 65 is connected to the second slide 62. The filling port forming mechanism 40 is installed on the first slide 61, and the ventilation hole forming rod 90 is connected to the second slide 62. The second drive member 64 and the third drive member 65 are both independent components, and can independently drive the filling port forming mechanism 40 and the ventilation hole forming rod 90 to move axially along the guide column 63, thereby adjusting the position of the filling port 73 and the ventilation hole 74.

[0036] The down-blowing device also includes a lifting mechanism 80, which is connected to the bottom of the frame 10 and is used to drive the frame 10 as a whole to connect the components installed on the frame 10 to rise and fall, so as to realize the demolding of the first blowing needle 20, the ventilation hole forming rod 90 and the urea pot 70 after molding.

[0037] Joint Reference Figure 5 and Figure 6 The first metal insert 50 has a hollow mounting opening, and a number of metal tooth blocks 51 are evenly distributed circumferentially on the inner side wall of the mounting opening; the first blow needle 20 is provided with a plurality of outwardly extending pressure blocks 21 on the outer peripheral wall of the end portion, and a gap is formed between the pressure block 21 and the step surface of the end portion of the first blow needle 20 to form a slot 22. When the first metal insert 50 is connected to the first blow needle 20, the pressure block 21 penetrates from the gap between the two adjacent metal tooth blocks 51, and the first metal insert 50 is rotated a certain angle so that the metal tooth block 51 is selected into the slot 22. The pressure block 21 realizes the engagement and limiting of the metal tooth block 51, thereby completing the connection between the first blow needle 20 and the first metal insert 50.

[0038] It should be noted that after the first metal insert 50 is connected to the wall 71 of the urea tank 70, a section of the wall 71 also covers the end surface of the first metal insert 50. This section is the mounting opening rim 711. The thickness of the mounting opening rim 711 is often greater than that of other parts of the wall 71 to ensure strength during repeated assembly and disassembly of the sensor mounting opening 72 and the external vehicle sensor. At the end of the blow molding process, the mounting opening rim 711 undergoes a compaction process. During this compaction process, the first blow needle 20 simultaneously moves the first metal insert 50 downward a distance to compact the mounting opening rim 711. This allows the first blow needle 20 to achieve axial connection and positional restraint with the first metal insert 50. In this embodiment, the axial positional restraint between the first blow needle 20 and the first metal insert 50 is achieved by the formed engaging groove 22 that engages the metal toothed block 51.

[0039] See Figure 7 Combined with Figure 2 and Figure 4 The synchronization mechanism 30 includes a first synchronization member 31 and a second synchronization member 32. The first synchronization member 31 is connected to the end of the first blow needle 20 and the two are an integrated structure; the second synchronization member 32 is roughly cylindrical, sleeved on the first blow needle 20 and rotates or slides axially relative to the first blow needle 20.

[0040] The synchronization mechanism 30 also includes a rotation drive assembly and a lift drive assembly. The rotation drive assembly includes a first motor 35 and a first ball nut 33 driven for rotation by the first motor 35; the lift drive assembly includes a second motor 36 and a second ball nut 34 driven for rotation by the second motor 36. The first ball nut 33 and the second ball nut 34 are both rotatably connected to the bearing block 11. The bearing block 11, the first motor 35, and the second motor 36 are all mounted on the frame 10.

[0041] The output shaft of the first motor 35 is connected to the first driving pulley 37, and the output shaft of the second motor 36 is connected to the second driving pulley 38; the first ball nut 33 has a first driven pulley, and the second ball nut 34 has a second driven pulley 341. The first driving pulley 37 and the first driven pulley 331, as well as the second driving pulley 38 and the second driven pulley 341 are all connected by a synchronous belt 39, so that the first motor 35 can drive the first ball nut 33 to rotate, and the second motor 36 can drive the second ball nut 34 to rotate.

[0042] In addition, the second synchronizer 32 is provided with a spiral groove 322 and a plurality of key grooves 323 opened vertically on the outer peripheral wall. The balls in the first ball nut 33 can roll in the spiral groove 322, and the balls in the second ball nut 34 can roll in the key groove 323. The first ball nut 33 and the spiral groove 322 form a first ball nut screw pair, and the second ball nut 34 and the plurality of key grooves 323 form a second ball nut screw pair; the first ball nut screw pair is used to drive the second synchronizer 32 to displace axially along the first blow needle 20, and the second ball nut screw pair is used to drive the second synchronizer 32 to rotate relative to the first blow needle 20.

[0043] Combine Figure 8 and Figure 9The synchronization mechanism 30 also includes a clutch assembly, which includes a plurality of clutch posts 314 connected to the first synchronizer 31 and a geared disc 321 connected to the second synchronizer 32. The first synchronizer 31 has a plurality of circumferentially evenly distributed guide holes 316 defined on its end surface. The clutch posts 314 include a first column 3141, a second column 3142, and a retaining ring 3143 connecting the first and second columns 3141, 3142. One end of the first column 3141 extends into the guide hole 316 and can slide axially along the guide hole 316. The second column 3142 extends out of the guide hole 316. An elastic member 315 is also installed in the guide hole 316. One end of the elastic member 315 contacts the first column 3141 and forces the entire clutch post 314 to move out of the guide hole 316. In order to limit the clutch column 314, the clutch assembly also includes a cover 311 connected to the first synchronizer 31. The cover 311 has a receiving groove 3111 with an opening on one side. The end of the first synchronizer 31 can be partially accommodated in the receiving groove 3111, and the cover 311 is connected to the first synchronizer 31 by a threaded connection.

[0044] Secondly, the cover 311 also has a plurality of adjustment openings 3112 that communicate with the receiving groove 3111. The adjustment openings 3112 are of a predetermined length and are adapted to accommodate the second column 3142. Simultaneously, the clutch post 314, under the force of the elastic member 315, constantly contacts the receiving groove 3111 with the retaining ring 3143. When the cover 311 is connected to the first synchronizer 31, the clutch post 314 is retained. When the cover 311 rotates relative to the first synchronizer 31, the clutch post 314 is driven to apply pressure to the elastic member 315, causing it to deform elastically, thereby changing the stiffness of the elastic member 315.

[0045] The toothed disc 321 has a plurality of teeth 3211 extending toward one side of the first synchronizer 31. The plurality of teeth 3211 are enclosed to form a wave-shaped tooth surface 3212 on the upper end surface. The end of the second column 3142 can slide on the tooth surface 3212. In order to reduce friction when the two slide, the end of the second column 3142 is set to a spherical surface, and the number of waves on the tooth surface 3212 and the height of the peaks and troughs are determined according to the size of the demolding force with the first metal insert 50.

[0046] The cover 311 is provided with a plurality of first force blocks 312 uniformly distributed in the circumferential direction at the outer edge of the end surface, and the toothed disc 321 is provided with a second force block 324 at the outer edge of the end surface. It is particularly noted that the height of the first force block 312 is lower than the end of the second column 3142, and the height of the second force block 324 is lower than the lowest point of the tooth 3211, ensuring that when the second synchronizer 32 is connected to the first synchronizer 31, the end of the second column 3142 contacts the tooth surface 3212. The force block 312 is not in contact with the second force block 324, and a limiting area 313 is formed between the two adjacent first force blocks 312. When the second synchronizer 32 moves up to a certain height, the second force block 324 can extend into the limiting area 313, and the first force block 312 can contact the second force block 324 to inhibit the relative rotation of the first synchronizer 31 and the second synchronizer 32. In this state, the second synchronizer 32 acts as a safety net to drive the first synchronizer 31 to rotate synchronously.

[0047] Joint Reference Figures 10 to 12 The adjustment frame 41 includes two support plates 411, and a top plate 412 and a bottom plate 413 connected between the two support plates 411. The second blow needle 42 is connected to the top plate 412, and the bottom plate 413 is further connected to a first driving member 44. A plurality of guide rods 414 are connected between the top and bottom plates 412, 413. The piston rod of the first driving member 44 is connected to the top plate 412, and the first driving member 44 can drive the top plate 412 to slide along the guide rods 414 of the second blow needle 42.

[0048] The bottom plate 413 is rotatably connected between the two support plates 411. Specifically, an adjusting member 415 is connected to one side of the support plate 411. The adjusting member 415 has a rotating shaft, which passes through a connecting hole 4111 provided on the support plate 411 and is connected to the bottom plate 413. Then, rotating the adjusting member 415 can drive the bottom plate 413 and the second blow needle 42 to rotate relative to the support plate 411, thereby adjusting the inclination angle of the second blow needle 42.

[0049] To adjust the tilt angle of the second blow needle 42, the adjusting member 415 has two adjustment holes 4151. A tool inserted into the adjustment holes 4151 rotates the adjusting member 415 relative to the support plate 411. To lock the base plate 413, the support plate 411 has a first locking hole 4112. A screw is inserted into the hole and connected to the base plate 413 to lock the support plate 411 with the base plate 413.

[0050] The second metal insert 43 is connected to the second blow needle 42. Unlike the first metal insert 50, the filling port 73 does not require compaction. That is, after the second metal insert 43 is connected to the kettle wall 71, the second blow needle 42 can be separated directly by demolding. The second metal insert 43 has a through-hole 431, into which a portion of the second blow needle 42 can be inserted. A limiting groove 432 is formed on one side of the limiting hole 431. The diameter of the limiting groove 432 is larger than that of the limiting hole 431. The second blow needle 42 is provided with a protruding ring 421, which abuts against the limiting groove 432 to limit the axial position of the second metal insert 43. The second blow needle 42 is further provided with at least one limit block 422 on the outer wall. In this embodiment, two limit blocks 422 are provided and are spaced 180° apart. The second metal insert 43 is further provided with a limit opening 433 in the limit hole 431. Part of the limit block 422 can be clamped in the limit opening 433 to limit the relative rotation angle between the second metal insert 43 and the second blow needle 42.

[0051] See Figure 13 The lifting mechanism 80 adopts a worm gear lift structure, including a transmission box 82, a worm 83 installed in the transmission box 82, a worm wheel 84 meshing with the worm 83, and a lead screw 85 threadedly connected to the center hole of the worm wheel 84. The transmission box 82 is connected to the bottom of the mounting plate 81, and the mounting plate 81 is fixed to the base of the blow molding machine. One end of the lead screw 85 is connected to an end cover 87 via a fastener 88, and the end cover 87 is connected to a lifting rod 86. One end of the lifting rod 86 is fixed to the end cover 87, and the other end is connected to the frame 10. Then, the rotation of the worm 83 can drive the lead screw 85 and the lifting rod 86 to move, thereby realizing the lifting and lowering of the frame 10.

[0052] When the down-blowing device is working, the material is extruded from the die head, and the mold is closed to shape the material. The first blow needle 20 and the second blow needle 42 are connected to the air source through a pipeline, and gas is continuously blown into the material cavity to keep it hollow. During the blow molding stage of the urea pot 70, the second blow needle 42 is first demolded from the second metal insert 43 under the drive of the first driving member 44, and then the lifting mechanism 80 drives the frame 10 downward for a distance so that the first metal insert 50 squeezes the mounting port edge 711. Then the first motor 35 and the second motor 36 work to drive the second synchronizer 32 to quickly move toward the side of the first synchronizer 31. When the end of the clutch column 314 contacts the tooth surface 3212, At this time, the synchronization mechanism 30 enters the first state. In this state, the clutch column 314 can slide along the tooth surface 3212, that is, the first synchronizer 31 and the second synchronizer 32 are connected but the two rotate relative to each other. The sliding of the clutch column 314 on the tooth surface 3212 causes the pressure block 21 to intermittently exert a relative force on the metal tooth block 51 of the first metal insert 50. In this process, in order to overcome the static friction between the two, a vibration impact of a certain frequency is generated by the sliding of the clutch column 314 on the tooth surface 3212, so that the metal tooth block 51 and the pressure block 21 gradually loosen. As the static friction between the two is overcome, the pressure block 21 will be displaced relative to the metal tooth block 51.

[0053] When the synchronization mechanism 30 enters the second state from the first state, as the second synchronization member 32 continues to move toward the first synchronization member 31, the clutch column 314 continues to squeeze the elastic member 315 and finally makes the elastic member 315 reach the maximum compression. At this time, the clutch column 314 is displaced relative to the guide hole 316. At this time, the clutch column 314 contacts the tooth surface 3212 and drives the teeth 3211 to rotate synchronously through the clutch column 314. That is, in the second state, the first synchronization member 31 and the second synchronization member 32 rotate synchronously, the pressure block 21 is separated from the metal tooth block 51, and the first blow needle 20 and the first metal insert 50 are rotated and demolded. Finally, the separation from the urea pot 70 is completed under the drive of the lifting mechanism 80.

[0054] Once again, in order to adjust the vibration impact of a certain frequency generated by the sliding of the clutch column 314 on the tooth surface 3212 in the first state, the number of teeth 3211 can be adaptively adjusted; at the same time, in order to increase the sliding time of the clutch column 314 on the tooth surface 3212 in the first state, the length of the pressure block 21 can also be adaptively adjusted.

[0055] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A urea kettle downward blowing device, characterized in that: include: Rack (10); A first blow needle (20) is mounted on the frame (10), wherein the first blow needle (20) has a plurality of circumferentially uniformly distributed pressing blocks (21) extending outward at an outer peripheral wall of an end portion; A first metal insert (50) is detachably connected to the end of the first blow needle (20), the first metal insert (50) having a mounting opening, a plurality of circumferentially evenly distributed metal tooth blocks (51) being provided on the inner side wall of the mounting opening, the pressing block (21) being in contact with the metal tooth blocks (51); and A synchronization mechanism (30), the synchronization mechanism (30) comprising a first synchronization member (31) and a second synchronization member (32) connected to the first blow needle (20), the first synchronization member (31) and the first blow needle (20) being capable of synchronous rotation, and the second synchronization member (32) being capable of rotation / axial sliding relative to the first blow needle (20); Among them, all the synchronization mechanisms (30) have a first state and a second state. In the first state, the first synchronization member (31) is connected to the second synchronization member (32) and the two rotate relative to each other; in the second state, the first synchronization member (31) is connected to the second synchronization member (32) and the two rotate synchronously. When the first blow needle (20) is separated from the first metal insert (50), it gradually switches from the first state to the second state.

2. A urea kettle downward blowing device according to claim 1, characterized in that: The synchronization mechanism (30) further includes a clutch assembly, and the clutch assembly includes: A toothed disc (321) connected to one end of the second synchronizer (32), wherein the toothed disc (321) has a plurality of teeth (3211) uniformly distributed in the circumferential direction on an end surface; A plurality of clutch columns (314) are connected to one end of a first synchronous member (31), wherein a guide hole (316) is formed at the end of the first synchronous member (31), and the clutch columns (314) are slidably connected in the guide hole (316) and the ends of the clutch columns (314) extend out of the guide hole (316); and An elastic member (315) is disposed in the guide hole (316) and contacts the clutch column (314), and is used to always force the clutch column (314) to have a movement tendency to separate from the guide hole (316); In the first state, the end of the clutch column (314) contacts the toothed disc (321), and the clutch column (314) can slide along the tooth surface (3212) of the plurality of teeth (3211); in the second state, the clutch column (314) contacts the side wall of one of the teeth (3211), and the two are relatively stationary.

3. A urea kettle downward blowing device according to claim 2, characterized in that: The clutch assembly further comprises a cover (311), the cover (311) being connected to the first synchronous member (31), the cover (311) further comprising an adjustment port (3112) for the clutch column (314) to pass through, the adjustment port (3112) being connected to the guide hole (316); wherein the cover (311) can rotate relative to the first synchronous member (31) to force the clutch column (314) to apply a force to the elastic member (315) to increase / decrease its stiffness.

4. A urea kettle downward blowing device according to claim 3, characterized in that: The clutch column (314) includes: A first column (3141), one end of which extends into the guide hole (316) and contacts the elastic member (315); a second column (3142), one end of the second column (3142) extending from the adjustment opening (3112) toward one side of the toothed disc (321); and A limiting ring (3143) connects the first column (3141) and the second column (3142), wherein the limiting ring (3143) contacts the cover (311); The limiting ring (3143) always contacts the cover (311), and when the cover (311) rotates relative to the first synchronous member (31), a force is applied to the limiting ring (3143) to force the clutch column (314) to move in the guide hole (316).

5. The urea kettle downward blowing device according to claim 3, characterized in that: The cover (311) is further provided with a plurality of circumferentially uniformly distributed first force blocks (312) at the outer edge, and a limiting area (313) is formed between two adjacent first force blocks (312). The toothed disc (321) further includes a second force block (324); wherein, when the synchronization mechanism (30) is in the process of switching from the first state to the second state, the second force block (324) extends into the limiting area (313) and can conflict with the side wall of one of the first force blocks (312).

6. The urea kettle downward blowing device according to claim 1, characterized in that: The synchronization mechanism (30) further includes: A rotary drive assembly, the rotary drive assembly comprising a first motor (35) and a first ball nut (33) driven to rotate by the first motor (35); and A lifting drive assembly, the lifting drive assembly comprising a second motor (36) and a second ball nut (34) driven to rotate by the second motor (36); The second synchronous member (32) is provided with a spiral groove (322) and a plurality of key grooves (323) provided along the axial direction on the outer peripheral wall; the first ball nut (33) and the spiral groove (322) form a first ball nut screw pair; the second ball nut (34) and the plurality of key grooves (323) form a second ball nut screw pair; the first ball nut screw pair is used to drive the second synchronous member (32) to move along the axial direction of the first blow needle (20); the second ball nut screw pair is used to drive the second synchronous member (32) to rotate relative to the first blow needle (20).

7. The urea kettle downward blowing device according to claim 1, characterized in that: Also includes: An adjusting frame (41) is rotatably connected to the frame (10); A first driving member (44) is connected to the adjustment frame (41); A second blow needle (42) connected to the driving member; as well as A second metal insert (43) connected to the second blow needle (42); When the adjustment frame (41) rotates relative to the frame (10), the tilt angle between the axis of the second blow needle (42) and the horizontal plane is adjusted.

8. The urea kettle downward blowing device according to claim 7, characterized in that: The second blow needle (42) has a convex ring (421) extending outward, the second metal insert (43) has a limiting hole (431) and a limiting groove (432) connected to the limiting hole (431), the second blow needle (42) partially extends into the limiting hole (431) and the convex ring (421) abuts against the limiting groove (432); wherein, the second blow needle (42) is further provided with at least one limiting block (422) on the outer peripheral wall, the second metal insert (43) is further provided with a limiting opening (433) connected to the limiting hole (431), the limiting block (422) is partially accommodated in the limiting opening (433) and can slide circumferentially in the limiting opening (433).

9. The urea kettle downward blowing device according to claim 7, characterized in that: Also includes: A ventilation hole forming rod (90); and A moving mechanism (60), wherein the moving mechanism (60) includes a first slide (61), a second slide (62), a guide column (63), a second driving member (64) and a third driving member (65), wherein the guide column (63) is connected to the frame (10), the first slide (61) and the second slide (62) are both slidably connected to the guide column (63), the second driving member (64) and the third driving member (65) are both installed on the frame (10), and the second driving member (64) is connected to the first slide (61), and the third driving member (65) is connected to the second slide (62), the adjusting frame (41) is installed on the first slide (61), and the ventilation hole forming rod (90) is connected to the second slide (62).

10. The urea kettle downward blowing device according to claim 1, characterized in that: It also includes a lifting mechanism (80) connected to the frame (10), and the lifting mechanism (80) is used to drive the frame (10) to move up and down.

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