A bidirectional dynamic balancing drive mechanism for a bottle mouth forming machine

Abstract

A bidirectional dynamic balancing drive mechanism for a bottle mouth forming machine, characterized in that the drive mechanism is composed of a motor, a flywheel, a crank rocker mechanism and a slot cam mechanism. The crank rocker mechanism is composed of a crankshaft, a connecting rod and a rocker rod, and the slot cam mechanism is composed of a slot cam and a driven push rod. The characteristics of this scheme are: the crank rocker mechanism and the slot cam mechanism are arranged in pairs with the crankshaft as the center, and the crank rocker mechanism and the slot cam mechanism are arranged symmetrically. When working, the paired mechanisms move synchronously in opposite directions, and most of the forming force and inertia force generated will offset each other in the drive mechanism, so that the vibration during operation is small and close to a balanced state. The present invention has a reasonable design and ingenious technical conception, and solves the problems of large driving force, unbalanced force and large vibration of the previous drive mechanism under working conditions.

Description

Technical Field

[0001] The invention belongs to can body forming equipment for metal cans, and relates to equipment for forming the mouth of metal bottles and cans, and in particular to a bidirectional dynamic balancing drive mechanism of a bottle mouth forming machine. Background Art

[0002] As people's living standards improve, high-end beverages in metal bottles and cans have various specifications in the market, especially in foreign countries where there is a large market demand. The appearance of metal bottles and cans is characterized by a conical mouth, a theft-proof groove 24 and a thread 25 for connecting a bottle cap, see Figure 1 As shown in the right figure in the figure. To manufacture it, the aluminum alloy plate must first be formed into a cylindrical shell through a stretching and thinning process (see Figure 1 The mouth (i.e., the can mouth) is then necked down multiple times to form a tapered shoulder, and the necked mouth is processed with threads, anti-theft grooves, trimming, and curling (see Figure 1 ).

[0003] At present, there are many forms of bottle mouth forming equipment, and its mainstream products are Belvac's BCMS (BottleCan Manufacturing System) and the turntable bottle mouth forming equipment of Mall Herlan, Hinterkopf, Frattini and other companies. Among them, Frattini's turntable bottle mouth forming equipment can be found in European patent EP0275369B1. The bottle mouth forming equipment of BCMS is the same as the two-piece can body necking machine, and is also modularly designed. The production capacity can reach 600 cans / minute, but its disadvantages are that it occupies a large area, is expensive, and has a large number of molds. The overall size of the turntable bottle mouth forming equipment is relatively small. The mold is installed on a huge tool plate for reciprocating motion, and the can is intermittently moved in the circumferential direction on another turntable. The problem brought about by this is that the equipment has a large vibration, and the process requirements for equipment manufacturing and assembly are very high. The equipment processing speed is low (150-200 cans / minute), and the cost performance is low.

[0004] In the bottle mouth forming equipment, the design of the driving mechanism is one of the cores of the whole equipment. It is not only the power source of the equipment, but more importantly, it will directly affect a series of important indicators such as processing efficiency, processing quality, energy consumption, equipment size, etc. In view of this, how to design a driving mechanism with high efficiency and dynamic balance for the bottle mouth forming equipment is the research topic of this invention. Summary of the invention

[0005] The invention provides a bidirectional dynamic balancing driving mechanism of a bottle mouth forming machine, and its purpose is to design a driving mechanism with high efficiency and dynamic balance to solve the problems of low efficiency, large vibration, poor economy and the like existing in the existing bottle mouth forming machine.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a two-way dynamic balancing drive mechanism for a bottle mouth forming machine, the innovation of which is that the two-way dynamic balancing drive mechanism is composed of a motor, a flywheel, a crank rocker mechanism and a slot cam mechanism, wherein:

[0007] The motor serves as a power source and outputs rotational power in a working state. The motor is positioned and installed relative to the base of the molding machine and has a rotation output end.

[0008] The flywheel, as a disc-shaped inertial component, provides a large moment of inertia, is rotationally supported relative to the base, and has a rotation input end and a rotation output end. The rotation output end of the motor is transmission-connected to the rotation input end of the flywheel.

[0009] The crank-rocker mechanism is composed of a crankshaft, connecting rods arranged in pairs, and rocker rods arranged in pairs, wherein:

[0010] Each connecting rod pair consists of two identical connecting rods.

[0011] Each pair of rocker arms is composed of two identical rocker arms, one end of each rocker arm is used as a hinged end, and the other end is used as a swinging end. A driving end is provided between the swinging end and the hinged end, and the hinged end of each rocker arm is rotatably connected relative to the base.

[0012] The crankshaft is rotatably supported relative to the base, and is transmission-connected to the rotating output end of the flywheel. A pair of cranks is provided on the crankshaft for each pair of connecting rods, and the pair of cranks consists of two cranks, which have opposite eccentric directions and are arranged adjacent to each other in the axial direction of the crankshaft.

[0013] Each crank is rotatably connected to one end of a connecting rod, and the other end of the connecting rod is rotatably connected to the driving end of a swing rod, thereby forming a crank swing rod mechanism, and two crank swing rod mechanisms arranged axially adjacent to each other form a pair of crank swing rod mechanisms. In a pair of crank swing rod mechanisms, the swing end of one swing rod serves as the first group of mold driving ends, and the swing end of the other swing rod serves as the second group of mold driving ends.

[0014] In the assembled state, the projections of the two rocker arms in each pair of crank-rocker arm mechanisms in the crankshaft axis direction are symmetrically arranged on both sides with reference to a vertical line passing through the center point of the crankshaft.

[0015] In the working state, when a pair of crank rocker mechanisms rotates with the crankshaft, the first group of mold driving ends and the second group of mold driving ends perform synchronous swinging reciprocating motion in opposite directions on a plane perpendicular to the crankshaft axis.

[0016] The groove cam mechanism is composed of groove cams arranged in pairs and driven push rods arranged in pairs, wherein:

[0017] Each pair of slot cams consists of two slot cams, and a wheel disc of each slot cam is provided with closed-loop grooves arranged along a circumferential spiral direction.

[0018] Each pair of driven push rods consists of two driven push rods, each of which is provided with a matching end and a moving end, wherein the moving end of one driven push rod serves as the first driving end for tank body displacement, and the moving end of the other driven push rod serves as the second driving end for tank body displacement.

[0019] In the assembled state, each groove cam is fixedly mounted on the crankshaft, and each driven push rod is slidably connected relative to the base in the direction of the crankshaft axis. The mating end of one driven push rod in each pair of driven push rods extends into the closed-loop groove of a corresponding groove cam to form a fit, and the mating end of the other driven push rod in each pair of driven push rods extends into the closed-loop groove of the corresponding other groove cam to form a fit. The two groove cams and the corresponding two driven push rods constitute a pair of groove cam mechanisms, and the two groove cams in a pair of groove cam mechanisms are arranged at intervals on the crankshaft axis.

[0020] In the working state, when a pair of groove cams rotate with the crankshaft, each groove cam drives a driven push rod, so that the first driving end of the tank body displacement and the second driving end of the tank body displacement perform synchronous linear reciprocating motion in opposite directions along the direction parallel to the crankshaft axis.

[0021] The relevant contents in the above technical solution are explained as follows:

[0022] 1. In the above scheme, the "paired arrangement" refers to arrangement in pairs, where a pair consists of two components or two sets of structures. The paired arrangement means at least one pair in quantity. In other words, it can be one pair, two pairs, three pairs, or even more pairs.

[0023] 2. In the above scheme, the crank rocker mechanism is composed of a pair of crank swing rod mechanisms. A pair of crank swing rod mechanisms are usually suitable for can mouth forming machines with relatively few molds and short molds arranged in a straight line on the equipment. Because a pair of crank swing rod mechanisms has a simpler structure than multiple pairs of crank swing rod mechanisms. However, it is not limited to this in special cases. For example, a pair of crank swing rod mechanisms is designed with good rigidity. Although there is only one swing rod, it adopts a multi-point push method in the vertical push direction with the slider carrying the mold.

[0024] 3. In the above scheme, the crank-rocker mechanism is composed of two pairs of crank-rocker mechanisms, which are arranged at intervals in the direction of the crankshaft axis, wherein the eccentricity direction of one pair of cranks is the same as that of the other pair of cranks, and the projections of one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms in the direction of the crankshaft axis coincide with each other. When the one pair of crank-rocker mechanisms and the other pair of crank-rocker mechanisms simultaneously rotate with the crankshaft, the one pair of crank-rocker mechanisms and the other pair of crank-rocker mechanisms move synchronously and have the same motion trajectory. In order to achieve a better effect of bidirectional dynamic balancing, the two pairs of crank-rocker mechanisms are symmetrically arranged with the middle plane perpendicular to the axis of the crankshaft (20) as a reference. Using two pairs of crank-rocker mechanisms is the best scheme of the present invention.

[0025] 4. In the above scheme, the crank-rocker mechanism is composed of three pairs of crank-rocker mechanisms, which are arranged at intervals in the direction of the crankshaft axis, wherein the eccentricity direction of one pair of cranks is the same as that of another pair of cranks, and the projections of one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms in the direction of the crankshaft axis coincide with each other. When one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms simultaneously rotate with the crankshaft, one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms move synchronously and have the same motion trajectory. When three pairs of crank-rocker mechanisms are used, it is preferred to arrange the three pairs of crank-rocker mechanisms at equal intervals in the direction of the crankshaft axis.

[0026] 5. In the above scheme, the groove cam mechanism is composed of a pair of groove cam mechanisms. This is the best scheme of the present invention. In addition, in a pair of groove cam mechanisms, since the driving force is large, considering the rigidity, deformation and structural mechanics, it is better to bias one driven push rod to one side with the crankshaft axis as a reference and bias the other driven push rod to the other side.

[0027] 6. In the above scheme, the groove cam mechanism is composed of two pairs of groove cam mechanisms, and the centers of the two pairs of groove cam mechanisms are arranged at intervals in the direction of the crankshaft axis. When one pair of groove cam mechanisms and another pair of groove cam mechanisms simultaneously rotate with the crankshaft, one pair of groove cam mechanisms and the other pair of groove cam mechanisms move synchronously and have the same motion trajectory. It is also possible to use two pairs of groove cam mechanisms to drive the carrier shifting mechanism (that is, to drive the tank body installed on the carrier shifting mechanism to rotate), but the structure is more complicated and the equipment cost increases.

[0028] 7. In the above scheme, the groove cam mechanism is composed of three pairs of groove cam mechanisms, and the centers of the three pairs of groove cam mechanisms are arranged at intervals in the direction of the crankshaft axis. When one pair of groove cam mechanisms and another pair of groove cam mechanisms simultaneously rotate with the crankshaft, one pair of groove cam mechanisms and the other pair of groove cam mechanisms move synchronously and have the same motion trajectory. It is theoretically feasible to use three pairs of groove cam mechanisms to drive the carrier shift mechanism, but the structure is complex and the equipment cost is high.

[0029] The design principle and concept of the present invention are: to solve the many problems of existing bottle mouth forming machines such as low efficiency, large vibration, poor economy, etc., especially the problems of large driving force, unbalanced force and large vibration of the equipment under working conditions. The technical concept adopted by the present invention for two rows of molds arranged in a straight line and two rows of unidirectional intermittent moving and closed-loop carrier shifting mechanisms can be summarized as follows: first, the crank rocker mechanism and the groove cam mechanism are arranged in pairs with the crankshaft as the center; second, the crank rocker mechanism and the groove cam mechanism are arranged symmetrically; third, the bidirectional dynamic balance of the driving force is ultimately achieved through synchronous reverse motion.

[0030] Due to the adoption of the above technical measures, the present invention has the following advantages and effects compared with the driving mechanism of the existing bottle can forming equipment:

[0031] 1. The driving mechanism of the present invention is basically arranged in pairs and symmetrically around the crankshaft. When working, the paired mechanisms move synchronously in opposite directions, and most of the forming force and inertia force generated will offset each other in the driving mechanism, so that the vibration during operation is small and close to a balanced state.

[0032] 2. The driving mechanism of the present invention is reasonably designed, the technical conception is ingenious, and it has outstanding substantial characteristics and significant progress, which solves the problems of large driving force, unbalanced force and large vibration of the previous driving mechanism in the working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Attached Figure 1 This is a schematic diagram of the bottle molding of the present invention;

[0034] Attached Figure 2 It is a three-dimensional diagram of an embodiment of a bidirectional dynamic balancing drive mechanism of a bottle mouth forming machine of the present invention;

[0035] Attached Figure 3 It is a three-dimensional diagram of the bottle mouth forming machine of the present invention;

[0036] Attached Figure 4 It is a cross-sectional view of the bottle mouth forming machine of the present invention;

[0037] Attached Figure 5 The present invention is a schematic diagram of the mouth forming mechanism of the bottle mouth forming machine.

[0038] In the above figures: 1. Motor; 2. Flywheel; 3. First connecting rod; 4. Second connecting rod; 5. Third connecting rod; 6. Fourth connecting rod; 7. First swing rod; 8. Second swing rod; 9. Third swing rod; 10. Fourth swing rod; 11. First slider; 12. Second slider; 13. First slot cam; 14. Second slot cam; 15. First driven push rod; 16. Second driven push rod; 17. Can body; 18. Can feeding mechanism; 19. Can discharging mechanism; 20. Crankshaft; 21. First set of molds; 22. Second set of molds; 23. Carrier moving mechanism; 24. Anti-theft groove; 25. Thread; 26. First driving end of first set of molds; 27. First driving end of second set of molds; 28. Second driving end of second set of molds; 29. ​​Second driving end of first set of molds; 30. First driving end of can body displacement; 31. Second driving end of can body displacement. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0040] Embodiment: A bidirectional dynamic balancing drive mechanism for a bottle mouth forming machine

[0041] like Figure 2-5 As shown, the bidirectional dynamic balancing drive mechanism is composed of a motor 1, a flywheel 2, a crank rocker mechanism and a slot cam mechanism, wherein: the crank rocker mechanism is composed of two pairs of crank rocker mechanisms, and the slot cam mechanism is composed of a pair of slot cam mechanisms (see Figure 2 ).

[0042] The motor 1 is used as a power source to output rotational power in the working state. The motor 1 is positioned and installed relative to the base of the molding machine. The motor 1 has a rotating output end (see Figure 2 ).

[0043] The flywheel 2 is a disc-shaped inertial component that provides a large moment of inertia. The flywheel 2 is supported relative to the base body for rotation. The flywheel 2 has a rotation input end and a rotation output end. The rotation output end of the motor 1 is transmission-connected to the rotation input end of the flywheel 2 (see Figure 2 ).

[0044] The crank-rocker mechanism is composed of two pairs of crank-rocker mechanisms, specifically including (see Figure 2 ):

[0045] A crankshaft 20 is rotatably supported relative to the base, and the crankshaft 20 is drivingly connected to the rotating output end of the flywheel 2. The crankshaft 20 is provided with four cranks, namely, a first crank, a second crank, a third crank and a fourth crank ( Figure 2(As can be seen in the figure, but the reference numerals are not shown), the four cranks are arranged at intervals along the axial direction of the crankshaft 20, wherein the eccentricity direction of the first crank and the fourth crank is the same, the eccentricity direction of the second crank and the third crank is the same, and the eccentricity direction of the first crank and the fourth crank is opposite to the eccentricity direction of the second crank and the third crank. The first crank and the second crank are arranged adjacent to each other in the axial direction of the crankshaft 20, and the third crank and the fourth crank are arranged adjacent to each other in the axial direction of the crankshaft 20.

[0046] Four identical links, namely the first link 3, the second link 4, the third link 5 and the fourth link 6 (see Figure 2 ).

[0047] Four identical pendulums, namely the first pendulum 7, the second pendulum 8, the third pendulum 9 and the fourth pendulum 10 (see Figure 2 ), one end of each rocker rod serves as a hinged end, and the other end serves as a swinging end, a driving end is provided between the swinging end and the hinged end, and the hinged end of each rocker rod is rotatably connected relative to the base.

[0048] The first crank is rotatably connected to one end of the first connecting rod 3, and the other end of the first connecting rod 3 is rotatably connected to the driving end of the first swing rod 7 (see Figure 2 The first crank, the first connecting rod 3 and the first swing rod 7 are connected to form a first crank swing rod mechanism, wherein the swing end of the first swing rod 7 serves as the first driving end 26 of the first group of molds (see Figure 5 ).

[0049] The second crank is rotatably connected to one end of the second connecting rod 4, and the other end of the second connecting rod 4 is rotatably connected to the driving end of the second swing rod 8 (see Figure 2 The second crank, the second connecting rod 4 and the second swing rod 8 are connected to form a second crank swing rod mechanism, wherein the swing end of the second swing rod 8 serves as the first driving end 27 of the second group of molds (see Figure 5 ).

[0050] The third crank is rotatably connected to one end of the third connecting rod 5, and the other end of the third connecting rod 5 is rotatably connected to the driving end of the third swing rod 9 (see Figure 2 The third crank, the third connecting rod 5 and the third swing rod 9 are connected to form a third crank swing rod mechanism, wherein the swing end of the third swing rod 9 serves as the second driving end 28 of the second group of molds (see Figure 5 ).

[0051] The fourth crank is rotatably connected to one end of the fourth connecting rod 6, and the other end of the fourth connecting rod 6 is rotatably connected to the driving end of the fourth swing rod 10 (see Figure 2 The fourth crank, the fourth connecting rod 6 and the fourth swing rod 10 are connected to form a fourth crank swing rod mechanism, wherein the swing end of the fourth swing rod 10 serves as the second driving end 29 of the first group of molds (see Figure 5 ).

[0052] In the above four crank-rocker mechanisms, the first crank-rocker mechanism and the second crank-rocker mechanism are arranged adjacent to each other and form a pair of crank-rocker mechanisms, and the third crank-rocker mechanism and the fourth crank-rocker mechanism are arranged adjacent to each other and form another pair of crank-rocker mechanisms (see Figure 2 ). Two pairs of crank rocker mechanisms are arranged at intervals in the direction of the crankshaft 20 axis (see Figure 2 ). Among them, the eccentric direction of one pair of cranks is the same as that of the other pair of cranks, and the projections of one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms in the direction of the crankshaft 20 axis coincide with each other (see Figure 4 ).

[0053] In the assembled state, the first crank-rocker mechanism and the fourth crank-rocker mechanism are located on one side of the reference line, and the second crank-rocker mechanism and the third crank-rocker mechanism are located on the other side of the reference line (see Figure 2 The first crank-rocker mechanism and the fourth crank-rocker mechanism are symmetrically arranged with the middle plane between them crossing the crankshaft 20 as a reference. The second crank-rocker mechanism and the third crank-rocker mechanism are symmetrically arranged with the middle plane between them crossing the crankshaft 20 as a reference (see Figure 2 The first crank-rocker mechanism and the second crank-rocker mechanism are arranged adjacent to each other in the axial direction of the crankshaft 20, wherein the projections of the first rocker bar 7 and the second rocker bar 8 in the axial direction of the crankshaft 20 are arranged symmetrically on both sides with reference to the vertical line passing through the center point of the crankshaft 20 (see Figure 2 ); The third crank-rocker mechanism and the fourth crank-rocker mechanism are arranged adjacent to each other in the axial direction of the crankshaft 20, wherein the projections of the third rocker 9 and the fourth rocker 10 in the axial direction of the crankshaft 20 are arranged symmetrically on both sides with reference to the vertical line passing through the center point of the crankshaft 20 (see Figure 2 ).

[0054] In the working state, when the first crank rocker mechanism, the second crank rocker mechanism, the third crank rocker mechanism and the fourth crank rocker mechanism rotate with the crankshaft 20, the first driving end 26 of the first group of dies and the first driving end 27 of the second group of dies perform synchronous swinging reciprocating motion in opposite directions on a plane perpendicular to the axis of the crankshaft 20 (see Figure 5 The second driving end 29 of the first group of dies and the second driving end 28 of the second group of dies perform synchronous swing reciprocating motion in opposite directions on a plane perpendicular to the axis of the crankshaft 20 (see Figure 5 The first driving end 26 of the first group of dies and the second driving end 29 of the first group of dies perform synchronous swing reciprocating motion in the same direction on a plane perpendicular to the axis of the crankshaft 20 (see Figure 5 The first driving end 27 of the second group of dies and the second driving end 28 of the second group of dies perform synchronous swing reciprocating motion in the same direction on a plane perpendicular to the axis of the crankshaft 20 (see Figure 5 ). When one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms simultaneously rotate along with the crankshaft 20, one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms move synchronously and have the same motion trajectory.

[0055] The groove cam mechanism is composed of a pair of groove cams and a pair of driven push rods, each pair of groove cams is composed of two groove cams, and each pair of driven push rods is composed of two driven push rods. In this embodiment, the groove cam mechanism is composed of a pair of groove cam mechanisms, specifically including (see Figure 2 ):

[0056] Two groove cams, namely the first groove cam 13 and the second groove cam 14, each groove cam has a closed-loop groove arranged along the circumferential spiral direction on its wheel disc (see Figure 2 ).

[0057] Two driven push rods, namely a first driven push rod 15 and a second driven push rod 16 (see Figure 2 and Figure 5 ), each driven push rod is provided with a matching end and a moving end, wherein the moving end of the first driven push rod 15 serves as the first driving end 30 for the tank body to shift (see Figure 5 ), the moving end of the second driven push rod 16 serves as the second driving end 31 for the tank body displacement (see Figure 5 In this embodiment, due to the large driving force, considering the rigidity, deformation and structural mechanics, in a pair of slot cam mechanisms, it is preferred to bias one driven push rod to one side with the crankshaft axis as a reference and bias the other driven push rod to the other side (see Figure 4 ).

[0058] In the assembled state, the first groove cam 13 and the second groove cam 14 are both fixedly mounted on the crankshaft 20, the first driven push rod 15 and the second driven push rod 16 are slidably connected relative to the base in the axial direction of the crankshaft 20 (not shown in the figure), and the mating end of the first driven push rod 15 extends into the closed loop groove of the first groove cam 13 to form a mating (see Figure 4 ), the mating end of the second driven push rod 16 extends into the closed loop groove of the second groove cam 14 to form a mating. The two groove cams in a pair of groove cam mechanisms are arranged at intervals on the axis of the crankshaft 20.

[0059] In the working state, when the two groove cams rotate with the crankshaft 20, each groove cam drives a driven push rod, so that the first drive end 30 of the tank body displacement and the second drive end 31 of the tank body displacement perform synchronous linear reciprocating motion in opposite directions along the direction parallel to the axis of the crankshaft 20 (see Figure 5 ).

[0060] The innovation of the present invention lies in the design of a bidirectional dynamic balancing drive mechanism for a bottle mouth forming machine. In order to better understand the innovation and features of the present invention, the working process of the bidirectional dynamic balancing drive mechanism of the present invention and the corresponding principle of the bottle mouth forming machine are described as follows:

[0061] Bottle mouth forming machine is a bottle mouth forming equipment that necks and rolls threads on stretched cylindrical metal shells (see Figure 1 When working, the motor 1 drives the flywheel 2 to drive the crankshaft 20 to perform continuous rotational motion. Four crank rocker mechanisms are arranged on the rotating crankshaft 20 (see Figure 2 ), each of the two crank rocker mechanisms drives the sliders with molds on both sides of the equipment to make relative linear reciprocating motion (see Figure 5 The first slider 11 and the second slider 12 in the equipment are used to form the metal can body 17 arranged in the middle of the equipment (see Figure 5 ). A plurality of carriers for clamping the metal can body 17 are connected end to end by hinges and connected in series to form a closed-loop carrier displacement mechanism 23 (see Figure 5 ), the metal tank body 17 follows the carrier and performs intermittent displacement motion (dynamic stop motion) along the guide rail under the drive of the groove cam mechanism installed on the crankshaft 20. The track of the guide rail is two straight lines connected by two semicircular arcs (see Figure 5 The metal can body 17 will pass through the positions corresponding to the molds of each station on the guide rail along the straight line segment and be processed and formed by the reciprocating mold (see Figure 5 The first set of dies 21 and the second set of dies 22 in the figure). The dies used for forming are necking, thread rolling, groove rolling, trimming, thinning, curling and pressing, which are installed on a long slider in a straight line (see Figure 5 The first slide block 11 and the second slide block 12 in the tank are connected to the tank by the tank feeding mechanism 18 (see Figure 3 ) The metal cans arranged in a row are sequentially fed into a carrier in an intermittent moving motion (stop-motion) state, and are discharged by a can discharging mechanism 19 (see Figure 3 ) Push the formed bottles and cans out of the carrier and send them out of the equipment.

[0062] The specific working principle and process of the bottle mouth forming machine are as follows:

[0063] 1. The driving mechanism is used to provide power for the movement of the first slider 11, the second slider 12 and the carrier shifting mechanism 23 (see Figure 2 and Figure 5 ).

[0064] The motor 1 drives the flywheel 2 to drive the crankshaft 20 to perform continuous rotational motion. The crankshaft 20 itself is designed with four cranks, and the eccentric direction of the crank connecting the first connecting rod 3 and the fourth connecting rod 6 is opposite to the eccentric direction of the crank connecting the second connecting rod 4 and the third connecting rod 5. When the crankshaft 20 rotates, it will drive the four connecting rods hinged to the four cranks to move, and then drive the four swing rods hinged to the four connecting rods to swing, among which the first swing rod 7 and the fourth swing rod 10 will drive the first slider 11, and the second swing rod 8 and the third swing rod 9 will drive the second slider 12, respectively, to perform linear reciprocating motion in opposite directions along the swinging direction (see Figure 5 ). 26 mold components are installed on the first slider 11 and the second slider 12 respectively. The mold functions include necking, thread rolling, groove rolling, trimming, thinning, curling and pressing. When the first slider 11 and the second slider 12 move towards each other, the molds installed on the sliders will process and shape the two rows of metal can bodies 17 arranged in the middle of the equipment. The mold components are distributed in a straight line along the length direction of the slider, and the distance between each pair is the same (see Figure 5 ).

[0065] 2. The carrier shifting mechanism 23 is used to make a whole circle of carriers holding the metal can body 17 synchronously perform intermittent shifting motion (dynamic-stop motion).

[0066] The first groove cam 13 and the second groove cam 14 are installed on the crankshaft 20 at intervals (see Figure 2 As the slot cam rotates, the two driven push rods (driven push rod 15 and driven push rod 16) will perform linear reciprocating motion in opposite directions along the axis of the crankshaft 20 under the drive of the corresponding slot cam (see Figure 5 ). There are a total of 68 sets of carriers for clamping the metal can body 17, which are hinged together and connected end to end to form a full circle of closed-loop carrier chain and are placed in the guide rail. When the two driven push rods move toward each other at the same time, the check valve (not shown in the figure) installed on the closed-loop carrier chain will push the carriers at their corresponding positions forward, so that the full circle of the closed-loop carrier chain will move forward one station at the same time, and each positioning mechanism (not shown in the figure) will temporarily fix each carrier pushed over, and then the metal can body 17 on each carrier will be formed by the mold that moves over. During the forming process, the two driven push rods will move in the opposite direction back to the origin. When the mold finishes the forming process and retreats in the opposite direction, the two driven push rods will move toward each other again to push the full circle of the closed-loop carrier chain to the next station, and the metal can body 17 will be formed by the mold of the next process. That is, the above-mentioned actions are repeated continuously under the drive of the crankshaft 20 to complete the continuous forming process of the metal can body 17 (see Figure 5 ).

[0067] Tank feeding mechanism 18 (see Figure 3) is used to deliver the continuously arranged unprocessed metal can bodies 17 one by one to the carriers in the closed-loop carrier chain in a dynamic-stop motion state.

[0068] Can discharging mechanism 19 (see Figure 3 ) is used to send the processed bottles and cans out of the equipment.

[0069] The following is an explanation of other implementations and structural changes of the present invention:

[0070] 1. In the above embodiments, the crank-rocker mechanism is composed of two pairs of crank-rocker mechanisms, and the two pairs of crank-rocker mechanisms are arranged at intervals in the crankshaft axis direction (see Figure 2 ). Using two pairs of crank rocker mechanisms is the best mode of the present invention. However, the present invention is not limited to this. In fact, the crank rocker mechanism can be composed of a pair of crank rocker mechanisms, or it can be composed of three pairs of crank rocker mechanisms, and the three pairs of crank rocker mechanisms are arranged at intervals in the direction of the crankshaft axis, or even more pairs of crank rocker mechanisms. A pair of crank rocker mechanisms is usually suitable for can mouth forming machines with relatively few molds and short molds arranged in a straight line on the equipment. Because a pair of crank rocker mechanisms is simpler in structure than multiple pairs of crank rocker mechanisms. However, it is not limited to this in special cases. For example, the rigidity of a pair of crank rocker mechanisms is very good. Although there is only one rocker, it adopts a multi-point push method in the vertical push direction with the slider carrying the mold. When three pairs of crank rocker mechanisms are used, it is better to arrange the three pairs of crank rocker mechanisms at equal intervals in the direction of the crankshaft axis. The use of three pairs of crank rocker mechanisms is relatively complex in structure, and the equipment cost will also increase accordingly, but it is very beneficial to increase the movement speed and rigidity of the equipment. The quantitative changes in the number of crank-rocker mechanism pairs and the corresponding technical effects are easily understood and accepted by those skilled in the art after reading.

[0071] 2. In the above embodiments, the groove cam mechanism is composed of a pair of groove cam mechanisms. This is the best solution of the present invention. However, the present invention is not limited to this. In fact, the groove cam mechanism can be composed of two pairs of groove cam mechanisms, or three pairs of groove cam mechanisms, or even more pairs of groove cam mechanisms. Using two pairs of groove cam mechanisms to drive the carrier shifting mechanism (i.e., driving the tank body installed on the carrier shifting mechanism to rotate) is just more complicated in structure and increases the equipment cost. Using three pairs of groove cam mechanisms to drive the carrier shifting mechanism is still feasible in theory, but the structure is complicated and the equipment cost is high.

[0072] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectional dynamic balancing drive mechanism for a bottle mouth forming machine, characterized in that: For two rows of molds arranged in a straight line and two rows of carrier shifting mechanisms that move intermittently in one direction and have a closed-loop structure, the bidirectional dynamic balancing drive mechanism is composed of a motor (1), a flywheel (2), a crank rocker mechanism and a slot cam mechanism, wherein: The motor (1) serves as a power source and outputs rotational power in a working state. The motor (1) is positioned and installed relative to the base of the molding machine. The motor (1) has a rotation output end. The flywheel (2) is a disc-shaped inertial component that provides a large moment of inertia. The flywheel (2) is rotationally supported relative to the base. The flywheel (2) has a rotation input end and a rotation output end. The rotation output end of the motor (1) is transmission-connected to the rotation input end of the flywheel (2). The crank-rocker mechanism is composed of a crankshaft (20), connecting rods arranged in pairs, and rocker rods arranged in pairs, wherein: Each link pair consists of two identical links; Each pair of swing rods is composed of two identical swing rods, one end of each swing rod is used as a hinge end, and the other end is used as a swing end. A driving end is provided between the swing end and the hinge end, and the hinge end of each swing rod is rotatably connected relative to the base body; The crankshaft (20) is rotatably supported relative to the base, and the crankshaft (20) is drivingly connected to the rotation output end of the flywheel (2); a pair of cranks is provided on the crankshaft (20) for each pair of connecting rods, and the pair of cranks consists of two cranks, the two cranks have opposite eccentric directions and are arranged adjacent to each other in the axial direction of the crankshaft (20); Each crank is rotatably connected to one end of a connecting rod, and the other end of the connecting rod is rotatably connected to the driving end of a swing rod, thereby forming a crank swing rod mechanism, and two crank swing rod mechanisms arranged axially adjacent to each other form a pair of crank swing rod mechanisms; in a pair of crank swing rod mechanisms, the swing end of one swing rod serves as the driving end of the first group of molds, and the swing end of the other swing rod serves as the driving end of the second group of molds; In the assembled state, the projections of the two rocker arms in each pair of crank rocker arm mechanisms in the axial direction of the crankshaft (20) are symmetrically arranged on both sides with reference to a vertical line passing through the center point of the crankshaft (20); In the working state, when the pair of crank rocker mechanisms rotate along with the crankshaft (20), the first group of mold driving ends and the second group of mold driving ends perform synchronous swinging reciprocating motion in opposite directions on a plane perpendicular to the axis of the crankshaft (20); The groove cam mechanism is composed of groove cams arranged in pairs and driven push rods arranged in pairs, wherein: Each pair of slot cams consists of two slot cams, and the wheel disc of each slot cam is provided with closed-loop grooves arranged along the circumferential spiral direction; Each pair of driven push rods is composed of two driven push rods, each driven push rod is provided with a matching end and a moving end, wherein the moving end of one driven push rod serves as a first driving end for the tank body to shift, and the moving end of the other driven push rod serves as a second driving end for the tank body to shift; In the assembled state, each slot cam is fixedly mounted on the crankshaft (20), each driven push rod is slidably connected relative to the base in the axial direction of the crankshaft (20), the mating end of one driven push rod in each pair of driven push rods extends into the closed-loop groove of a corresponding slot cam to form a mating relationship, and the mating end of the other driven push rod in each pair of driven push rods extends into the closed-loop groove of the corresponding other slot cam to form a mating relationship, the two slot cams and the corresponding two driven push rods form a pair of slot cam mechanisms, and the two slot cams in the pair of slot cam mechanisms are arranged at intervals on the axis of the crankshaft (20); In a working state, when a pair of grooved cams rotate along with the crankshaft (20), each grooved cam drives a driven push rod, so that the first drive end of the tank body displacement and the second drive end of the tank body displacement perform synchronous linear reciprocating motion in opposite directions along a direction parallel to the axis of the crankshaft (20); When the bidirectional dynamic balancing drive mechanism is in operation, the motor (1) drives the flywheel (2) to drive the crankshaft (20) to perform continuous rotational motion. The crankshaft (20) that performs rotational motion is provided with a pair of crank rocker mechanisms. The pair of crank rocker mechanisms correspondingly drive sliders equipped with molds on both sides of the device to perform relative linear reciprocating motion, so as to perform molding processing on the metal can body (17) arranged in the middle of the device. A plurality of carriers for clamping the metal can body (17) are hingedly connected end to end and connected in series to form a closed-loop carrier shifting mechanism (23). The metal can body (17) follows the carrier and performs intermittent displacement motion along the guide rail under the drive of the groove cam mechanism installed on the crankshaft (20). The trajectory of the guide rail is two straight lines connected by two semicircular arcs. The metal can body (17) will pass through the positions corresponding to the molds of each station on the guide rail in sequence along the straight line segment and be molded by the reciprocating mold.

2. The bidirectional dynamic balancing drive mechanism according to claim 1, characterized in that: The crank-rocker mechanism is composed of a pair of crank-rocker mechanisms.

3. The bidirectional dynamic balancing drive mechanism according to claim 1, characterized in that: The crank-rocker mechanism is composed of two pairs of crank-rocker mechanisms, which are arranged at intervals in the direction of the crankshaft (20) axis, wherein the eccentricity direction of one pair of cranks is the same as that of the other pair of cranks, and the projections of one pair of crank-rocker mechanisms and the other pair of crank-rocker mechanisms in the direction of the crankshaft (20) axis coincide with each other, and when the one pair of crank-rocker mechanisms and the other pair of crank-rocker mechanisms simultaneously rotate with the crankshaft (20), the one pair of crank-rocker mechanisms and the other pair of crank-rocker mechanisms move synchronously and have the same motion trajectory.

4. The bidirectional dynamic balancing drive mechanism according to claim 3, characterized in that: The two pairs of crank rocker mechanisms are symmetrically arranged with a middle plane perpendicular to the axis of the crankshaft (20) as a reference.

5. The bidirectional dynamic balancing drive mechanism according to claim 1, characterized in that: The crank-rocker mechanism is composed of three pairs of crank-rocker mechanisms, which are arranged at intervals in the direction of the crankshaft (20) axis, wherein the eccentricity direction of one pair of cranks is the same as that of another pair of cranks, and the projections of one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms in the direction of the crankshaft (20) axis coincide with each other, and when one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms simultaneously rotate with the crankshaft (20), one pair of crank-rocker mechanisms and another pair of crank-rocker mechanisms move synchronously and have the same motion trajectory.

6. The bidirectional dynamic balancing drive mechanism according to claim 1, characterized in that: The grooved cam mechanism is composed of a pair of grooved cam mechanisms.

7. The bidirectional dynamic balancing drive mechanism according to claim 6, characterized in that: One of the driven push rods in the pair of groove cam mechanisms is offset to one side with the axis of the crankshaft (20) as a reference, and the other driven push rod is offset to the other side.

8. The bidirectional dynamic balancing drive mechanism according to claim 1, characterized in that: The groove cam mechanism is composed of two pairs of groove cam mechanisms, the centers of the two pairs of groove cam mechanisms are arranged at intervals in the axial direction of the crankshaft (20), and when one pair of groove cam mechanisms and the other pair of groove cam mechanisms simultaneously rotate with the crankshaft (20), the one pair of groove cam mechanisms and the other pair of groove cam mechanisms move synchronously and have the same movement trajectory.

9. The bidirectional dynamic balancing drive mechanism according to claim 1, characterized in that: The groove cam mechanism is composed of three pairs of groove cam mechanisms, the centers of the three pairs of groove cam mechanisms are arranged at intervals in the axial direction of the crankshaft (20), and when one pair of groove cam mechanisms and another pair of groove cam mechanisms simultaneously rotate with the crankshaft (20), one pair of groove cam mechanisms and the other pair of groove cam mechanisms move synchronously and have the same movement trajectory.

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