A urea kettle down-blow device

Abstract

The application discloses a urea kettle lower blowing device, which comprises a rack, a first blowing needle, a first metal insert and a synchronous mechanism. The first metal insert is provided with a mounting port. A plurality of metal tooth-shaped blocks are uniformly distributed on the inner side wall of the mounting port. The pressing block is in contact with the metal tooth-shaped blocks. The synchronous mechanism has a first state and a second state. In the first state, the first synchronous part and the second synchronous part are connected and relatively rotate. In the second state, the first synchronous part and the second synchronous part are connected and synchronously rotate. When the first blowing needle is separated from the first metal insert, the first state is gradually switched to the second state. During the process that the first blowing needle is gradually switched from the first state to the second state under the action of the synchronous mechanism, the rotating torque gradually increases, so that the force acting on the first metal insert also gradually increases, thereby the gap generated at the connection between the first metal insert and the material due to instantaneous force can be reduced, and the forming quality is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of blow molding related devices, and in particular to a urea pot lower blowing device. BACKGROUND

[0002] The urea pot is applied to diesel locomotives, such as some large trucks, and urea solution contained in the urea pot can react with nitrogen oxides in exhaust gas to achieve exhaust gas treatment of the vehicle. The urea pot is molded in the same way as many plastic hollow containers on the market, that is, hollow blow molding is adopted; the difference is that, due to the structural characteristics of the urea pot, the end of the blow pin of the lower blowing device needs to be connected to a metal insert, and the metal insert is blow molded together with the plastic pot body during blow molding.

[0003] For example, the SCR urea tank for diesel engine exhaust aftertreatment disclosed in the authorized announcement CN203050857U has a gas exchange valve mounting port, a sensor mounting port and a urea filling port on the tank body, wherein the sensor mounting port and the filling port each have a metal insert. The sensor mounting port needs to be connected to a vehicle sensor, and in order to achieve quick disassembly and ensure the reliability after connection, the insert in the sensor mounting port has a special clamping structure. Referring to the binding belt type urea tank disclosed in CN202946219U, the insert in the sensor mounting port has a plurality of circumferentially distributed metal tooth-shaped rings at the outer edge of the opening, and the vehicle sensor connector also has a plurality of clamping blocks. During the connection process, the clamping blocks pass through the gap between the two adjacent metal tooth-shaped rings and rotate by an angle to complete the abutment with the surface of the metal tooth-shaped ring, and 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 pin, and after blow molding, the insert is connected to the material. During demolding, the blow pin needs to be reversely rotated by a certain angle to separate the metal tooth-shaped ring of the insert and then exit the blow pin. During this process, since the plastic material has not been completely cooled, the insert has not reached a completely solidified connection state after being connected to the material. When the blow pin is relatively rotated and separated from the insert, the insert is subjected to a circumferential force exerted by the blow pin to generate a torque. The circumferential torque can cause a certain rotational force between the insert and the plastic material which has not been completely cooled and solidified. The greater the circumferential torque, the easier it is to increase the gap between the insert and the material. After the product is molded, the insert has a certain movement space, which affects the molding quality. SUMMARY

[0005] In order to gradually increase the circumferential torque of the insert during the separation of the blow pin and the insert, avoid the instantaneous circumferential torque transmission to cause the huge rotational force between the insert and the not fully cooled material, improve the forming quality, the application provides a urea kettle blow-down device.

[0006] The urea kettle blow-down device provided by the application adopts the following technical scheme:

[0007] The urea kettle blow-down device comprises:

[0008] A rack;

[0009] A first blow pin is installed on the rack, and the first blow pin has a plurality of circumferentially distributed pressing blocks extending outward at the outer peripheral wall of the end portion;

[0010] A first metal insert is detachably connected to the end portion of the first blow pin, the first metal insert has a mounting port, a plurality of circumferentially distributed metal tooth-shaped blocks are arranged on the inner side wall of the mounting port, and the pressing blocks abut on the metal tooth-shaped blocks; and

[0011] A synchronous mechanism, the synchronous mechanism comprises a first synchronous part and a second synchronous part connected with the first blow pin, the first synchronous part and the first blow pin can synchronously rotate, and the second synchronous part can rotate / axially slide relative to the first blow pin;

[0012] All the synchronous mechanisms have a first state and a second state, in the first state, the first synchronous part and the second synchronous part are connected and relatively rotate, in the second state, the first synchronous part and the second synchronous part are connected and synchronously rotate, and the first blow pin gradually switches from the first state to the second state when the first blow pin is separated from the first metal insert.

[0013] By adopting the above technical scheme, the first metal insert is connected with the plastic material after mold clamping, the first blow pin is connected with the first metal insert after abutting against the metal toothed block through the pressing block, the first blow pin is demolded, the first synchronous part and the second synchronous part connected with the first blow pin interact by the synchronous mechanism, and the first synchronous part is gradually switched from the first state to the second state, when the first state is entered, the second synchronous part is connected with the first synchronous part but the two are relatively rotated, in this process, the first synchronous part is not synchronously rotated with the second synchronous part, but the two have a certain connection relationship, so that the first synchronous part is subjected to the rotating force of the second synchronous part, and the rotating force is transmitted to the first metal insert to generate a certain rotating starting force, when the second state is gradually switched to, the second synchronous part drives the first synchronous part to synchronously rotate, at this time, the first blow pin is rotated relative to the first metal insert to gradually start demolding, and the influence of the forming quality caused by the large rotating force of the first metal insert due to the instantaneous torque is effectively overcome.

[0014] Preferably, the synchronous mechanism further comprises a clutch assembly, and the clutch assembly comprises:

[0015] A toothed disc connected to one end of the second synchronous part, the toothed disc has a plurality of circumferentially distributed teeth on the end face;

[0016] A plurality of clutch columns connected to one end of the first synchronous part, the first synchronous part is provided with a guide hole at the end portion, the clutch columns are slidingly connected in the guide hole, and the end portions of the clutch columns extend out of the guide hole; and

[0017] An elastic member arranged in the guide hole and abutting against the clutch columns, for always forcing the clutch columns to have a movement trend of being separated from the guide hole;

[0018] When the first state is entered, the end portions of the clutch columns abut against the toothed disc, and the clutch columns can slide along the tooth surfaces of the teeth; when the second state is entered, the clutch columns abut against the side walls of one of the teeth, and the two are relatively stationary.

[0019] By adopting the technical scheme, when the first blow pin is in the first state, the clutch column slides on the plurality of teeth of the tooth disc, the plurality of teeth form a tooth surface with ups and downs, and the clutch column can generate intermittent extrusion force when sliding on the tooth surface. The intermittent extrusion force is gradually transmitted to the first blow pin, and then the intermittent force on the first metal insert can be realized. This process is similar to generating a certain frequency of vibration, so that the first blow pin and the first metal insert are more smooth when they are preliminarily rotated and separated. It is like that a certain amount of looseness is first generated between the first blow pin and the first metal insert. After the first state is converted to the second state, the extrusion force of the clutch column and one of the teeth drives the synchronous rotation of the first synchronous part and the second synchronous part to realize the rotation separation between the first metal insert, and better realizes the slow demolding effect and improves the molding quality.

[0020] Preferably, the clutch assembly further comprises a cover, the cover is connected with the first synchronous part, the cover further has an adjusting opening for the clutch column to pass through, and the adjusting opening is communicated with the guide hole; wherein the cover can rotate relative to the first synchronous part to force the clutch column to apply force to the elastic part to increase / decrease the rigidity of the elastic part.

[0021] By adopting the technical scheme, when the cover rotates with the first synchronous part, the clutch column can be driven to act on the elastic part. When the rigidity of the elastic part increases, the sliding friction of the clutch column on the tooth surface is greater, and then the starting force on the first metal insert is greater, and vice versa. The blow molding demolding of products with different demolding force requirements can be realized.

[0022] Preferably, the clutch column comprises:

[0023] a first column body, one end of the first column body extends into the guide hole and abuts against the elastic part;

[0024] a second column body, one end of the second column body extends from the adjusting opening to one side of the tooth disc; and

[0025] a limiting ring connected with the first column body and the second column body, the limiting ring abuts against the cover;

[0026] wherein the limiting ring always abuts against the cover, and when the cover rotates relative to the first synchronous part, the limiting ring is forced to displace in the guide hole by the action force applied to the limiting ring.

[0027] By adopting the technical scheme, the first column body is arranged to slide and guide in the guide hole as the sliding guide of the clutch column; the second column body is mainly connected with the tooth surface, the limiting ring abuts against the cover to limit the clutch column from disengaging from the guide hole, and the action force applied to the limiting ring can drive the clutch column to displace along the guide hole, thereby better regulating the rigidity of the elastic part.

[0028] Preferably, the cover is further provided with a plurality of first force applying blocks at the outer edge, a limiting area is formed between two adjacent first force applying blocks, and the gear disc further comprises a second force applying block; wherein, when the synchronous mechanism is switched from the first state to the second state, the second force applying block extends into the limiting area and can abut against the sidewall of one of the first force applying blocks.

[0029] By adopting the above technical scheme, the limiting area limits the stroke distance required for switching from the first state to the second state, and when the second state is turned to the second state, the abutment of the second force applying block and the first force applying block can realize the synchronous rotation of the second synchronous member and the first synchronous member, the abutment of the second force applying block and the first force applying block serves as the bottom line for the synchronous mechanism to enter the second state, and when the clutch column completely abuts against one of the gear teeth, the second state can also be entered, thereby ensuring the last demolding and the stability of demolding.

[0030] Preferably, the synchronous mechanism further comprises:

[0031] a rotary driving assembly, the rotary driving assembly comprising a first motor and a first ball nut driven to rotate by the first motor; and

[0032] a lifting driving assembly, the lifting driving assembly comprising a second motor and a second ball nut driven to rotate by the second motor;

[0033] wherein, the second synchronous member is provided with a spiral groove on the outer peripheral wall and a plurality of key grooves along the axial direction, 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 synchronous member to displace along the first blowing needle axis, and the second ball nut screw pair is used to drive the second synchronous member to rotate relative to the first blowing needle.

[0034] By adopting the above technical scheme, the second synchronous member can be driven to move away from / close to one end of the first synchronous member by the lifting driving assembly before being connected with the first synchronous member, and the second synchronous member is driven to rotate relative to the first blowing needle by the rotary driving assembly. When the synchronous mechanism enters the first state, the lifting driving assembly drives the second synchronous member to move close to the first synchronous member and realize the connection; during the switching from the first state to the second state and when entering the second state, the lifting driving assembly and the rotary driving assembly are synchronously driven, so that the second synchronous member rotates while moving close to the first synchronous member; the spiral groove on the outer peripheral wall of the second synchronous member, the plurality of key grooves along the axial direction, and the independent driving of the first ball nut and the second ball nut can be flexibly operated and simplify the structure.

[0035] Preferably, the synchronous mechanism further comprises:

[0036] The adjusting frame is rotatably connected to the frame;

[0037] The first driving member is connected to the adjusting frame;

[0038] The second blowing needle is connected to the driving member; and

[0039] The second metal insert is connected to the second blowing needle;

[0040] When the adjusting frame rotates relative to the frame, the inclination angle between the axis of the second blowing needle and the horizontal plane is adjusted.

[0041] By using the above technical scheme, after the second metal insert is connected to the second blowing needle, the second metal insert is retained in the filling opening after forming. Since the filling opening does not need to be connected to external components, it is only a hole, and after the second metal insert is connected to the material, the first driving member directly drives the second blowing needle to separate. The adjusting frame is arranged to facilitate adjustment of the inclination angle of the filling opening.

[0042] Preferably, the second blowing needle has an outwardly extending protruding ring, the second metal insert has a limiting hole and a limiting slot communicating with the limiting hole, the second blowing needle partially extends into the limiting hole and the protruding ring abuts against the limiting slot; wherein the second blowing needle is further provided with at least one limiting block on the outer peripheral wall, the second metal insert is further provided with a limiting opening communicating with the limiting hole, and the limiting block is partially accommodated in the limiting opening and can slide circumferentially in the limiting opening.

[0043] By using the above technical scheme, when the second metal insert is connected to the second blowing needle, the second blowing needle penetrates into the limiting hole, and the abutment of the protruding ring and the limiting slot achieves displacement limiting of the second metal insert and the second blowing needle on one side in the axial direction. At the same time, the limiting block is partially clamped into the limiting opening to inhibit relative rotation between the second metal insert and the second blowing needle.

[0044] Preferably, the adjusting frame further comprises:

[0045] The air exchange hole forming rod; and

[0046] The moving mechanism, the moving mechanism comprising a first sliding table, a second sliding table, a guide column, a second driving member and a third driving member, the guide column being connected to the frame, the first sliding table and the second sliding table being slidably connected to the guide column, the second driving member and the third driving member being installed on the frame, the second driving member being connected to the first sliding table, and the third driving member being connected to the second sliding table, the adjusting frame being installed on the first sliding table, and the air exchange hole forming rod being connected to the second sliding table.

[0047] By adopting the above technical scheme, the air hole forming rod is used for forming the air hole of the urea kettle, the moving mechanism controls the positions of the first sliding table and the second sliding table through the second driving element and the third driving element respectively, and then the relative positions of the second blowing needle and the air hole forming rod on the rack are adjusted, and the application range is increased.

[0048] Preferably, the lifting mechanism connected to the rack is further included, and the lifting mechanism is used for driving the rack to lift.

[0049] By adopting the above technical scheme, after the first blowing needle is rotated away from the first metal insert, the lifting mechanism drives the rack to communicate with the first blowing needle to descend to realize complete separation, and before blow molding, the corresponding blowing needle needs to be lifted to the molding position.

[0050] In summary, the present application includes at least one of the following beneficial technical effects:

[0051] 1. During the process that the first blowing needle gradually switches from the first state to the second state under the action of the synchronous mechanism, the rotation torque gradually increases, so that the force acting on the first metal insert also gradually increases when the rotation torque is transmitted to the first metal insert, thereby reducing the gap at the connection between the first metal insert and the material due to instantaneous force, and improving the molding quality.

[0052] 2. By providing the clutch assembly, when the first blowing needle is in the first state, the gap type force generated during the sliding of the clutch column along the plurality of teeth further overcomes the static friction force between the first blowing needle and the first metal insert when the first blowing needle and the first metal insert rotate relative to each other, so that a certain looseness is generated between the first blowing needle and the first metal insert, and the first blowing needle can quickly and smoothly realize the rotation separation from the first metal insert after entering the second state.

[0053] 3. By applying force to the clutch column through the rotation of the cover relative to the first synchronous part to change the stiffness of the elastic part, the size of the force between the first blowing needle and the first metal insert in the first state is adjusted to adapt to different working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 It is a structure schematic view of the lower blowing device of the urea kettle.

[0055] Figure 2 It is a schematic view mainly showing the connection between the first blowing needle and the synchronous mechanism.

[0056] Figure 3 It is a schematic view mainly showing the connection between the second blowing needle and the air hole forming rod.

[0057] Figure 4 It is a schematic view mainly showing the connection between the urea kettle after molding and the lower blowing device.

[0058] Figure 5 Fig. 12 is a schematic view showing the connection of the first metal insert and the first blow pin;

[0059] Figure 6 Fig. 13 is a schematic view showing the exploded view of the first metal insert and the first blow pin;

[0060] Figure 7 Fig. 14 is a schematic view showing the connection of the first synchronizer and the second synchronizer;

[0061] Figure 8 Fig. 15 is a schematic view showing the connection of the clutch assembly;

[0062] Figure 9 Fig. 16 is a schematic view showing the exploded view of the cover and the clutch column of the clutch assembly;

[0063] Figure 10 Fig. 17 is a schematic view showing the structure of the adjusting frame;

[0064] Figure 11 Fig. 18 is a schematic view showing the exploded view of the second blow pin and the second metal insert from one perspective;

[0065] Figure 12 Fig. 19 is a schematic view showing the exploded view of the second blow pin and the second metal insert from another perspective;

[0066] Figure 13 Fig. 20 is a schematic view showing the structure of the lifting mechanism.

[0067] 10, frame; 11, bearing seat; 20, first blowing needle; 21, pressing block; 22, clamping groove; 30, synchronous mechanism; 31, first synchronous piece; 311, cover; 3111, accommodating groove; 3112, adjusting opening; 312, first force applying block; 313, limiting area; 314, clutching column; 3141, first column body; 3142, second column body; 3143, limiting ring; 315, elastic piece; 316, guide hole; 32, second synchronous piece; 321, toothed disc; 3211, tooth; 3212, tooth surface; 322, helical groove; 323, key groove; 324, second force applying 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 opening forming mechanism; 41, adjusting frame; 411, support plate; 4111, connecting hole; 4112, first locking hole; 412, top plate; 413, bottom plate; 414, guide rod; 415, adjusting piece; 4151, adjusting hole; 42, second blowing needle; 421, protruding ring; 422, limiting block; 423, connecting seat; 4231, second locking hole; 43, second metal insert piece; 431, limiting hole; 432, limiting groove; 433, limiting opening; 44, first driving piece; 50, first metal insert piece; 51, metal toothed block; 60, moving mechanism; 61, first sliding table; 62, second sliding table; 63, guide column; 64, second driving piece; 65, third driving piece; 70, urea kettle; 71, kettle wall; 711, mounting opening hem; 72, sensor mounting opening; 73, filling opening; 74, air exchange hole; 80, lifting mechanism; 81, mounting plate; 82, transmission box; 83, worm; 84, worm wheel; 85, lead screw; 86, lifting rod; 87, end cover; 88, fastener; 90, air exchange hole forming rod. DETAILED DESCRIPTION

[0068] The application will be further described below in conjunction with the drawings.

[0069] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustration only and are not intended to be limiting.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "and / or" includes a set of one or more associated listed items.

[0071] Figures 1 to 4 The structure of a urea pot bottom blowing device is shown, which is applied to blow molding of a urea pot 70, for molding a filling opening 73, a sensor mounting opening 72 and a gas exchange hole 74 in the urea pot 70, and blowing air into a cavity in the urea pot 70 during the molding process to keep the urea pot 70 hollow.

[0072] The bottom blowing device comprises a frame 10, a filling opening molding mechanism 40 mounted on the frame 10, a first blowing needle 20 and a gas exchange hole molding rod 90. The first blowing needle 20 is disposed between the filling opening molding mechanism 40 and the gas exchange hole molding rod 90, and the end of the first blowing needle 20 is connected with a first metal insert 50 which is reserved in the sensor mounting opening 72 of the urea pot 70 after molding. A synchronization mechanism 30 is further connected to the first blowing needle 20, which is used to separate the first blowing needle 20 from the first metal insert 50 after molding.

[0073] The filling opening molding mechanism 40 comprises an adjusting frame 41 and a second blowing needle 42 mounted on the adjusting frame 41, one end of the second blowing needle 42 is connected with a second metal insert 43 which is reserved in the filling opening 73 of the urea pot 70 after molding, and one end of the gas exchange hole molding rod 90 is directly used as an insert for molding the gas exchange hole 74 of the urea pot 70.

[0074] In the bottom blowing device, a moving mechanism 60 is further arranged on the frame 10, which is used to adjust the horizontal position of the filling opening molding mechanism 40 and the gas exchange hole molding rod 90 relative to the frame 10, so as to adapt to the requirements of different molding opening positions. Specifically, the moving mechanism 60 comprises a first sliding table 61, a second sliding table 62, a guide column 63, a second driving member 64 and a third driving member 65, the guide column 63 has two ends connected to the frame 10, the first sliding table 61 and the second sliding table 62 are both slidingly connected to the guide column 63, the second driving member 64 is connected to the first sliding table 61, the third driving member 65 is connected to the second sliding table 62, the filling opening molding mechanism 40 is mounted on the first sliding table 61, the gas exchange hole molding rod 90 is connected to the second sliding table 62, the second driving member 64 and the third driving member 65 are both independent components, so as to independently drive the filling opening molding mechanism 40 and the gas exchange hole molding rod 90 to axially displace along the guide column 63, thereby adjusting the positions of the filling opening 73 and the gas exchange hole 74.

[0075] The lower blowing device further comprises a lifting mechanism 80 connected to the lower part of the frame 10, which is used to drive the frame 10 and the components mounted on the frame 10 to rise or fall as a whole, so as to realize the demolding of the first blowing needle 20, the air exchange hole forming rod 90 and the urea pot 70 after forming.

[0076] For your reference Figure 5 With Figure 6 The first metal insert 50 has a hollow mounting port, and a plurality of metal tooth-shaped blocks 51 are uniformly distributed on the inner side wall of the mounting port in the circumferential direction; the first blowing needle 20 is provided with a plurality of outwardly extending pressing blocks 21 on the outer peripheral wall of the end portion, and the pressing blocks 21 and the stepped surface of the end portion of the first blowing needle 20 have a gap to form a clamping groove 22; when the first metal insert 50 is connected with the first blowing needle 20, the pressing blocks 21 pass through the gap between the adjacent two metal tooth-shaped blocks 51, and the first metal insert 50 is rotated by a certain angle, so that the metal tooth-shaped blocks 51 are selected into the clamping groove 22, and the pressing blocks 21 realize clamping and limiting of the metal tooth-shaped blocks 51, thereby completing the connection of the first blowing needle 20 and the first metal insert 50.

[0077] It is particularly pointed out that after the first metal insert 50 is connected with the pot wall 71 of the urea pot 70, the pot wall 71 will cover a section of the end surface of the first metal insert 50, which is the mounting port edge 711, and the thickness of the mounting port edge 711 is often greater than that of other positions of the pot wall 71 to ensure the strength of the sensor mounting port 72 during multiple disassembly and assembly with external vehicle sensors. In the final blow molding process, the mounting port edge 711 needs to be compacted, and in the compacting process, the first blowing needle 20 will synchronously drive the first metal insert 50 to move downward by a distance to compact the mounting port edge 711, and then the first blowing needle 20 needs to be axially connected and limited with the first metal insert 50, and in the embodiment, the clamping and limiting of the metal tooth-shaped blocks 51 is realized by the clamping groove 22 to realize the axial limiting of the first blowing needle 20 and the first metal insert 50.

[0078] For your reference Figure 7 At the same time, in combination with Figure 2 With Figure 4 The synchronous mechanism 30 comprises a first synchronous part 31 and a second synchronous part 32, the first synchronous part 31 is connected to the end portion of the first blowing needle 20 and they are an integral structure; the second synchronous part 32 is substantially cylindrical, is sleeved on the first blowing needle 20 and can rotate or axially slide relative to the first blowing needle 20.

[0079] The synchronous mechanism 30 further comprises a rotating driving assembly and a lifting driving assembly. The rotating driving assembly comprises a first motor 35 and a first ball nut 33 rotating driven by the first motor 35; the lifting driving assembly comprises a second motor 36 and a second ball nut 34 rotating driven by the second motor 36. The first ball nut 33 and the second ball nut 34 are both rotationally connected to the bearing seat 11, and the bearing seat 11, the first motor 35 and the second motor 36 are all mounted on the rack 10.

[0080] The output shaft of the first motor 35 is connected with a first driving pulley 37, and the output shaft of the second motor 36 is connected with a 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 and the second driving pulley 38 and the second driven pulley 341 are all connected through 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.

[0081] In addition, the second synchronous part 32 is provided with a spiral groove 322 and a plurality of vertical key grooves 323 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 grooves 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 synchronous part 32 to axially displace along the first blowing needle 20, and the second ball nut screw pair is used to drive the second synchronous part 32 to rotate relative to the first blowing needle 20.

[0082] In combination with Figure 8 With Figure 9The synchronous mechanism 30 further comprises a clutch assembly, which comprises a plurality of clutch columns 314 connected to the first synchronous member 31 and a toothed disc 321 connected to the second synchronous member 32. The first synchronous member 31 is provided with a plurality of circumferentially distributed guide holes 316 on the end face, and the clutch column 314 comprises a first column body 3141, a second column body 3142 and a limiting ring 3143 connecting the first column body 3141 and the second column body 3142 in an integral structure. One end of the first column body 3141 extends into the guide hole 316 and can slide along the axial direction of the guide hole 316. The second column body 3142 extends out of the guide hole 316. An elastic member 315 is further installed in the guide hole 316, one end of the elastic member 315 abuts against the first column body 3141 and can force the entire clutch column 314 to have a movement tendency of being separated from the guide hole 316. In order to limit the clutch column 314, the clutch assembly further comprises a cover 311 connected to the first synchronous member 31. The cover 311 is provided with a receiving groove 3111 with an open side, and the end portion of the first synchronous member 31 can be partially accommodated in the receiving groove 3111. The cover 311 is connected to the first synchronous member 31 in a threaded connection manner.

[0083] Secondly, the cover 311 is further provided with a plurality of adjusting openings 3112 communicating with the receiving groove 3111. The adjusting opening 3112 has a certain length and can be penetrated by the second column body 3142. At the same time, the limiting ring 3143 of the clutch column 314 always abuts against the receiving groove 3111 under the action of the elastic member 315. When the cover 311 is connected to the first synchronous member 31, the clutch column 314 is limited. When the cover 311 rotates relative to the first synchronous member 31, the clutch column 314 can drive the elastic member 315 to be pressed to be elastically deformed, thereby changing the rigidity of the elastic member 315.

[0084] The toothed disc 321 is provided with a plurality of teeth 3211 extending towards the side of the first synchronous member 31. The teeth 3211 are enclosed on the upper end face to form a wave-shaped tooth surface 3212. The end portion of the second column body 3142 can slide on the tooth surface 3212. In order to reduce the friction when the two slide, the end portion of the second column body 3142 is provided as a spherical surface, and the number of waves of the tooth surface 3212 and the height of the wave crest and trough are determined according to the demolding force of the first metal insert 50.

[0085] The cover 311 is provided with a plurality of first force applying blocks 312 which are evenly distributed in the circumferential direction at the outer edge of the end surface. The toothed disc 321 is provided with second force applying blocks 324 at the outer edge of the end surface. It is particularly pointed out that the height of the first force applying blocks 312 is lower than the end of the second column 3142, and the height of the second force applying blocks 324 is lower than the lowest point of the tooth 3211. When the second synchronous member 32 is connected with the first synchronous member 31, the end of the second column 3142 is in contact with the tooth surface 3212, and the first force applying blocks 312 are not in contact with the second force applying blocks 324. Adjacent two first force applying blocks 312 form a limiting area 313. When the second synchronous member 32 moves upward to a certain height, the second force applying blocks 324 can extend into the limiting area 313, and the first force applying blocks 312 can abut on the second force applying blocks 324 to inhibit the relative rotation of the first synchronous member 31 and the second synchronous member 32. In this state, the first synchronous member 31 is driven to rotate synchronously by the second synchronous member 32 as a bottom design.

[0086] Referring to Figures 10 to 12 , the adjusting frame 41 comprises two support plates 411, a top plate 412 and a bottom plate 413 which are connected between the two support plates 411. The second blowing needle 42 is connected to the top plate 412, and the first driving member 44 is further connected to the bottom plate 413. A plurality of guide rods 414 are connected between the top plate 412 and the bottom plate 413. The piston rod of the first driving member 44 is connected to the top plate 412, so that the top plate 412 and the second blowing needle 42 can slide along the guide rods 414 by driving the first driving member 44.

[0087] The bottom plate 413 is rotationally connected between the two support plates 411. Specifically, one side of the support plate 411 is connected with an adjusting member 415 which has a rotating shaft. The rotating shaft passes through a connecting hole 4111 formed in the support plate 411 and is connected with the bottom plate 413. Thus, rotating the adjusting member 415 can drive the bottom plate 413 to rotate relative to the support plate 411 and the second blowing needle 42, so as to adjust the inclination angle of the second blowing needle 42.

[0088] When the inclination angle of the second blowing needle 42 is adjusted, two adjusting holes 4151 are formed in the adjusting member 415. A tool is inserted into the adjusting hole 4151 to drive the adjusting member 415 to rotate relative to the support plate 411. In order to lock the bottom plate 413, a first locking hole 4112 is formed in the support plate 411. A screw is inserted into the first locking hole 4112 and connected with the bottom plate 413 to lock the support plate 411 and the bottom plate 413.

[0089] The second metal insert 43 is connected with the second blow pin 42, and different from the first metal insert 50, the filling opening 73 does not need to be compacted, that is, after the second metal insert 43 is connected with the kettle wall 71, the second blow pin 42 can be directly demolded and separated. The second metal insert 43 has a limiting hole 431 penetrating through, and part of the second blow pin 42 can be arranged in the limiting hole 431. A limiting groove 432 is communicated on one side of the limiting hole 431, and the diameter of the limiting groove 432 is greater than the diameter of the limiting hole 431. The second blow pin 42 is provided with a convex ring 421, and the convex ring 421 can abut on the limiting groove 432 to limit the second metal insert 43 on one side in the axial direction. The second blow pin 42 is further provided with at least one limiting block 422 on the outer wall, and in the embodiment, the limiting block 422 is provided with two and is spaced by 180°. The second metal insert 43 is further provided with a limiting hole 433 in the limiting hole 431, and part of the limiting block 422 can be clamped in the limiting hole 433 to limit the relative rotation angle between the second metal insert 43 and the second blow pin 42.

[0090] Referring to Figure 13 The lifting mechanism 80 adopts a worm lifting machine structure, including a transmission box 82, a worm 83 installed in the transmission box 82, a worm gear 84 engaged with the worm 83, and a lead screw 85 threadedly connected to the center hole of the worm gear 84. The transmission box 82 is connected to the bottom of the mounting plate 81, and the mounting plate 81 is fixed on the base of the blow molding machine. One end of the lead screw 85 is connected to an end cover 87 through a fastener 88, the end cover 87 is connected to a lifting rod 86, one end of the lifting rod 86 is fixed with the end cover 87, and the other end is connected with the rack 10. Through the rotation of the worm 83, the lead screw 85 and the lifting rod 86 can be driven to move, thereby realizing the lifting of the rack 10.

[0091] When the device is working, the material is extruded from the die head, the die is closed to shape the material, the first blowing needle 20 and the second blowing needle 42 are connected to the air source through the pipeline, the material cavity is continuously blown into gas to keep it hollow, and the urea kettle 70 is in the stage of blow molding. The second blowing needle 42 is first demolded from the second metal insert 43 under the driving of the first driving part 44, then the gantry 10 is driven by the lifting mechanism 80 to move downward by a distance, so that the first metal insert 50 extrudes the edge 711 of the mounting port, then the first motor 35 and the second motor 36 work to drive the second synchronous part 32 to quickly displace toward the side of the first synchronous part 31. When the end of the clutch column 314 abuts against the tooth surface 3212, the first state of the synchronous mechanism 30 is entered, in which state, the clutch column 314 can slide along the tooth surface 3212, that is, the first synchronous part 31 and the second synchronous part 32 are connected but relatively rotate, and the sliding of the clutch column 314 on the tooth surface 3212 makes the pressing block 21 intermittently act 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 certain frequency of vibration impact is generated by the sliding of the clutch column 314 on the tooth surface 3212, so that the metal tooth block 51 and the pressing block 21 gradually loosen, and with the overcoming of the static friction between the two, the pressing block 21 will displace relative to the metal tooth block 51.

[0092] When the first state enters the second state of the synchronous mechanism 30, with the continuous displacement of the second synchronous part 32 toward the first synchronous part 31, the clutch column 314 continues to extrude the elastic element 315 until the elastic element 315 reaches the maximum compression amount, at which time the clutch column 314 displaces relative to the guide hole 316, at which time the clutch column 314 abuts against the tooth surface 3212 and drives the gear teeth 3211 to synchronously rotate, that is, in the second state, the first synchronous part 31 and the second synchronous part 32 synchronously rotate, the pressing block 21 and the metal tooth block 51 are separated, and the rotary demolding of the first blowing needle 20 and the first metal insert 50 is completed. Finally, the separation from the urea kettle 70 is completed under the driving of the lifting mechanism 80.

[0093] Again, in order to adjust the certain frequency of vibration impact generated by the sliding of the clutch column 314 on the tooth surface 3212 in the first state, the number of gear 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 pressing block 21 can also be adaptively adjusted.

[0094] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A urea kettle under-blowing device, characterized by, The utility model relates to a kind of needle loom, including: Frame (10); First blow needle (20) is installed on frame (10), and the first blow needle (20) has a plurality of circumferentially distributed pressure blocks (21) extending outward at the outer peripheral wall of end portion; First metal insert (50) is detachably connected to the end portion of first blow needle (20), and the first metal insert (50) has a mounting port, the mounting port is provided with a plurality of circumferentially distributed metal tooth-shaped blocks (51) on the inner side wall, and the pressure block (21) is in contact with the metal tooth-shaped block (51);And Synchronization mechanism (30), the synchronization mechanism (30) includes first synchronization piece (31) and second synchronization piece (32) connected with first blow needle (20), the first synchronization piece (31) can be synchronized with first blow needle (20) rotation, and the second synchronization piece (32) can rotate and axially slide relative to first blow needle (20); The synchronization mechanism (30) further includes a clutch assembly, and the clutch assembly includes: Gear disc (321) is connected to one end of second synchronization piece (32), and the gear disc (321) has a plurality of circumferentially distributed gear teeth (3211) on the end face; A plurality of clutch columns (314) are connected to one end of first synchronization piece (31), the first synchronization piece (31) is provided with a guide hole (316) at the end portion, the clutch column (314) is slidingly connected in the guide hole (316), and the end portion of the clutch column (314) extends out of the guide hole (316);And Elastic member (315) is arranged in the guide hole (316) and in contact with the clutch column (314), for always forcing the clutch column (314) to have a tendency to move away from the guide hole (316); Wherein, all synchronization mechanisms (30) have a first state and a second state, in the first state, the first synchronization piece (31) is connected with the second synchronization piece (32) and the relative rotation occurs between them, the end portion of the clutch column (314) is in contact with the gear disc (321), and the clutch column (314) can slide along the tooth surface (3212) of a plurality of gear teeth (3211);In the second state, the first synchronization piece (31) is connected with the second synchronization piece (32) and the synchronous rotation occurs between them, the clutch column (314) is in contact with the side wall of one of the gear teeth (3211), and both are in relative static state, the first blow needle (20) is gradually switched from the first state to the second state when it is separated from the first metal insert (50).

2. A urea kettle under-blowing device according to claim 1, characterized in that The clutch assembly further includes a cover (311), the cover (311) is connected with the first synchronization piece (31), the cover (311) further has an adjusting port (3112) for the clutch column (314) to pass through, and the adjusting port (3112) communicates with the guide hole (316);Wherein, the cover (311) can rotate relative to the first synchronization piece (31) to force the clutch column (314) to exert force on the elastic member (315) to increase / decrease the rigidity.

3. A urea kettle under-blowing device according to claim 2, wherein The clutch column (314) includes: A first column (3141) has one end extending into the guide hole (316) and abutting against the elastic member (315); A second column (3142) has one end extending from the adjusting opening (3112) towards one side of the tooth disc (321); and A limiting ring (3143) is connected between the first column (3141) and the second column (3142) and abuts against the cover (311). The limiting ring (3143) always abuts against the cover (311), and when the cover (311) rotates relative to the first synchronous member (31), an acting force is applied to the limiting ring (3143) to force the clutch column (314) to displace in the guide hole (316).

4. A urea kettle under-blowing device according to claim 2, wherein The cover (311) is further provided with a plurality of first force applying blocks (312) uniformly distributed in the circumferential direction at the outer edge, a limiting area (313) is formed between two adjacent first force applying blocks (312), and the tooth disc (321) further comprises a second force applying block (324); when the synchronous mechanism (30) is in the process of switching from the first state to the second state, the second force applying block (324) extends into the limiting area (313) and can abut against the side wall of one of the first force applying blocks (312).

5. A urea kettle under-blowing device according to claim 1, wherein The synchronous mechanism (30) further comprises: A rotary driving assembly comprising a first motor (35) and a first ball nut (33) driven to rotate by the first motor (35); and A lifting driving 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) on the outer peripheral wall and a plurality of key grooves (323) along the axial direction, 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 synchronous member (32) to displace axially along the first blowing needle (20), and the second ball nut screw pair is used to drive the second synchronous member (32) to rotate relative to the first blowing needle (20).

6. A urea jug blow down apparatus according to claim 1, wherein Further comprising: An adjusting frame (41) rotatably connected to the rack (10); A first driving member (44) connected to the adjusting frame (41); A second blowing needle (42) connected to the driving member; And A second metal insert (43) connected to the second blowing needle (42); When the adjusting frame (41) rotates relative to the rack (10), the inclination angle between the axis of the second blowing needle (42) and the horizontal plane is adjusted.

7. A urea kettle under-blowing device according to claim 6, wherein The second blowing needle (42) has an outwardly extending convex ring (421), the second metal insert (43) has a limiting hole (431) and a limiting slot (432) communicating with the limiting hole (431), the second blowing needle (42) partially extends into the limiting hole (431) and the convex ring (421) abuts against the limiting slot (432); wherein the second blowing 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) communicating with the limiting hole (431), and the limiting block (422) is partially accommodated in the limiting opening (433) and can slide in the limiting opening (433) in the circumferential direction.

8. A urea jug blow down apparatus according to claim 6, wherein Further comprising: A ventilation hole forming rod (90); and A moving mechanism (60) comprising a first sliding table (61), a second sliding table (62), a guide column (63), a second driving member (64) and a third driving member (65), the guide column (63) is connected to the rack (10), the first sliding table (61) and the second sliding table (62) are both slidingly connected to the guide column (63), the second driving member (64) and the third driving member (65) are both mounted on the rack (10), the second driving member (64) is connected to the first sliding table (61), and the third driving member (65) is connected to the second sliding table (62), the adjusting rack (41) is mounted on the first sliding table (61), and the ventilation hole forming rod (90) is connected to the second sliding table (62).

9. A urea jug blow down apparatus according to claim 1, wherein, Further comprising a lifting mechanism (80) connected to the rack (10), the lifting mechanism (80) is used to drive the rack (10) to lift.

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