A filling mechanism and a filling method of a condensate bead automatic packaging machine

Abstract

The application relates to the technical field of bead coagulation packaging machines, and particularly discloses a filling mechanism and a filling method of an automatic bead coagulation packaging machine, which comprises a driving part, a dose adjusting part and a pump head filling part; the driving part comprises a rotary driving device, an eccentric wheel and a transmission assembly thereof; the dose adjusting part realizes motion conversion through a three-link mechanism; and the pump head filling part adopts a multi-piston parallel layout. The application is driven in one direction continuously by a servo motor and is controlled by an electronic cam, so that mechanical loss during forward and reverse rotation can be reduced, high-speed filling can be realized, the stroke of the pump head piston is accurately controllable through lever fulcrum dynamic adjusting technology, and accurate control of the set filling dose is guaranteed; through the synchronous execution of the liquid pumping and discharging actions of multiple pump head pistons which are distributed at equal intervals, multi-station parallel filling is realized, the single filling cycle is shortened to 0.3 seconds, and the efficiency is obviously improved compared with a traditional cylinder driving mode.

Description

Technical Field

[0001] This invention relates to the field of agar pod packaging machine technology, and particularly to a filling mechanism and filling method for an automatic agar pod packaging machine. Background Technology

[0002] Liquid granules are typically encapsulated in PVA water-soluble film. As the core equipment for efficiently packaging liquid granules, automatic granule packaging machines require filling mechanisms to complete high-precision metering and continuous production in a very short time. Shortening the single-filling cycle has become a key breakthrough goal for the industry. However, traditional technologies suffer from the following problems: pneumatic drive relies on cylinders to push plunger pumps, and the filling volume is easily affected by fluctuations in compressed air pressure, resulting in insufficient dosage stability and difficulty in guaranteeing yield.

[0003] Existing patent documents, such as Chinese Patent Publication No. CN203381822U, disclose a bag feeding mechanism consisting of a cam and a connecting rod. This mechanism includes a support, a swing arm shaft rotatably mounted on the support, a cam swing arm mounted on the swing arm shaft, a cam roller mounted in the middle of the cam swing arm, and a cam roller in rolling engagement with a cam above it. The upper end of the cam swing arm is connected to the lower end of a connecting rod, and the upper end of the connecting rod is connected to a small swing arm. The small swing arm is rotatably mounted on a mounting plate via a shaft. A swing rod is also mounted on the shaft, with an inner clamping nozzle mounted on its upper end. The rear end of the inner clamping nozzle is rotatably mounted on the mounting plate and connected to an adjusting rod above it. The other end of the adjusting rod is also rotatably mounted on the mounting plate. An outer clamping nozzle is rotatably mounted on the front end of the inner clamping nozzle, and the upper end of the outer clamping nozzle is connected to the piston rod of a bag-clamping cylinder behind it. This structure uses a cylinder to drive a small swing arm, which in turn drives a swing rod, which in turn drives the piston rod of the bag clamping cylinder. Only one piston rod can be driven at a time. If it is directly applied to an automatic packaging machine for aerosol beads, only one packaging bag can be filled at a time, resulting in low filling efficiency and no dosage adjustment function.

[0004] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a filling mechanism and filling method for an automatic packaging machine for agar beads, so as to solve the above problems.

[0006] A filling mechanism for an automatic packaging machine for granules includes a drive unit, a dosage adjustment unit, and a pump head filling unit;

[0007] The drive section includes a rotary drive device and an eccentric wheel that is drively connected to the drive shaft of the rotary drive device.

[0008] The dosage adjustment section includes a first link, a second link, and a third link; one end of the first link is hinged to the eccentric shaft of the eccentric wheel, and the other end is hinged to the second link; the second link has a pivot point, and the second link can rotate around the pivot point; one end of the third link is hinged to the second link, and the pivot point divides the second link into a first lever segment and a second lever segment, and the length ratio of the first lever segment to the second lever segment is adjustable;

[0009] The pump head filling part includes a mounting plate, a pump head piston, and a pump head; the mounting plate is connected to the third connecting rod; the pump head piston is disposed on the mounting plate; and the pump head cooperates with the pump head piston.

[0010] Specifically, the dosage adjustment section includes a fulcrum adjustment mechanism, which includes a drive motor, a lead screw connected to the output shaft of the drive motor, and a slider threaded with the lead screw. The rotation fulcrum is set on the slider and is sleeved on the second connecting rod. The drive motor drives the lead screw to rotate, thereby driving the slider to move linearly along the lead screw. The slider drives the rotation fulcrum to slide and adjust its position along the second connecting rod.

[0011] Specifically, there are multiple pump head pistons, which are evenly distributed on the mounting plate.

[0012] Specifically, the number of pump head pistons is 7-16.

[0013] Specifically, the pump head is provided with a horizontally penetrating material channel, one end of which is a liquid extraction port and is provided with a first one-way valve, and the other end is a liquid discharge port and is provided with a second one-way valve; the pump head is also provided with a vertical extraction and discharge channel, which is connected to the material channel, and the pump head piston can reciprocate along the extraction and discharge channel.

[0014] Specifically, both the first check valve and the second check valve are duckbill valves.

[0015] Specifically, the second link and the third link are connected by a hinge shaft; the second link is provided with a waist hole for the hinge shaft to move.

[0016] A filling method includes the following steps:

[0017] Start-up drive: Start the rotary drive device to drive the eccentric wheel to rotate;

[0018] Drive the linkage motion: The eccentric wheel drives the first linkage to move;

[0019] Motion conversion: The first link drives the second link to rotate around its pivot point;

[0020] Power transmission: The second link drives the third link to move;

[0021] Drive piston: The third connecting rod drives the mounting plate to drive the pump head piston to reciprocate vertically within the pump head;

[0022] Complete the pumping and discharging cycle: The pump head piston performs one upward stroke to complete the pumping action and one downward stroke to complete the discharging action within the pump head's pumping and discharging channel; wherein, for each rotation of the eccentric wheel, the pump head piston completes one pumping and one discharging action.

[0023] Specifically, it also includes a dosage adjustment step: by adjusting the position of the pivot point on the second connecting rod, the length ratio of the first lever segment to the second lever segment is changed to adjust the reciprocating stroke of the pump head piston.

[0024] The beneficial effects of this invention are:

[0025] The automatic packaging machine for aerosol beads disclosed in this application includes a filling mechanism and a filling method. The filling mechanism comprises a drive section, a dosage adjustment section, and a pump head filling section. The drive section includes a servo motor, an eccentric wheel, and its transmission components. The dosage adjustment section achieves motion conversion through a three-bar linkage. The pump head filling section adopts a multi-piston parallel layout. The servo motor's unidirectional continuous drive combined with electronic cam control reduces mechanical losses during forward and reverse rotation, enabling high-speed filling. The lever fulcrum dynamic adjustment technology ensures precise control of the pump head piston stroke, guaranteeing accurate control of the set filling dosage. By synchronously executing the pumping and discharging actions of multiple equally spaced pump head pistons, multi-station parallel filling is achieved, shortening the single filling cycle to 0.3 seconds, significantly improving efficiency compared to the traditional cylinder-driven method. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the filling mechanism of this application. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the filling mechanism of this application. Figure 2 ;

[0028] Figure 3 for Figure 2 Enlarged view of section A;

[0029] Figure 4 This is a cross-sectional view of the pump head piston and pump head of this application;

[0030] Figure 5 This is a comparison graph showing the relationship between filling volume and time, and the relationship between motor speed and time in this application. In the graph, t1 is the liquid extraction time, and t2 is the liquid discharge time.

[0031] Figure 6 This is a schematic diagram of the filling mechanism of this application. Figure 3 .

[0032] The attached figures are labeled as follows: drive unit 10, dosage adjustment unit 20, pump head filling unit 30, eccentric wheel 11, first connecting rod 21, second connecting rod 22, third connecting rod 23, eccentric shaft 12, rotation fulcrum 24, mounting plate 31, pump head piston 32, pump head 33, material channel 331, first one-way valve 332, second one-way valve 333, extraction channel 334, hinge shaft 25, waist hole 26, motor 41, lead screw 42, slider 43. Detailed Implementation

[0033] This invention provides a filling mechanism and filling method for an automatic packaging machine for granules. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] like Figure 1 and Figure 6 As shown, this embodiment discloses a filling mechanism for an automatic packaging machine for aerosol beads, including a drive section 10, a dosage adjustment section 20, and a pump head filling section 30. The drive section 10 includes a rotary drive device and an eccentric wheel 11 that is driven by the drive shaft of the rotary drive device. The rotary drive device is a servo motor. The dosage adjustment section 20 includes a first connecting rod 21, a second connecting rod 22, and a third connecting rod 23. One end of the first connecting rod 21 is hinged to the eccentric shaft 12 of the eccentric wheel 11, and the other end is hinged to the second connecting rod 22. The connecting rod 22 is provided with a pivot point 24, and the second connecting rod 22 can rotate around the pivot point 24; one end of the third connecting rod 23 is hinged to the second connecting rod 22, and the pivot point 24 divides the second connecting rod 22 into a first lever segment and a second lever segment, the length ratio of the first lever segment to the second lever segment is adjustable; the pump head filling part 30 includes a mounting plate 31, a pump head piston 32 and a pump head 33; the mounting plate 31 is connected to the third connecting rod 23; the pump head piston 32 is mounted on the mounting plate 31; the pump head 33 cooperates with the pump head piston 32.

[0036] The filling mechanism of this embodiment can be installed in an automatic packaging machine for laundry detergent pods. Its specific operating principle is as follows: A servo motor drives the eccentric wheel 11 to rotate continuously in one direction. The eccentric shaft 12 drives the first connecting rod 21 to oscillate periodically. When this oscillation is transmitted to the second connecting rod 22, it forms a lever-type angular displacement around the pivot point 24. The pivot point 24 divides the second connecting rod 22 into a first lever segment and a second lever segment with an adjustable length ratio. By adjusting the position of the pivot point 24, the lever ratio can be changed to adjust the amplitude of the movement. The second connecting rod 22... The angular displacement is converted into the linear reciprocating motion of the mounting plate 31 via the third link 23, thereby driving the pump head piston 32 to perform a precise stroke within the pump head 33: when the pump head piston 32 moves downward, the first one-way valve 332 at the pump head 33's suction port position opens to complete the suction (low-speed waiting stage); when the pump head piston 32 moves upward, the second one-way valve 333 at the pump head 33's discharge port position opens to complete the discharge (high-speed working stage). The entire process is controlled by the periodic motion of the eccentric wheel 11 to achieve a 0.3-second filling cycle, and the pump head piston 32 automatically resets to the ejection origin at the end of each cycle.

[0037] This embodiment also includes a fulcrum adjustment mechanism, which includes a motor 41, a lead screw 42 connected to the output shaft of the motor 41, and a slider 43 threadedly engaged with the lead screw 42. A rotation fulcrum 24 is mounted on the slider 43 and is sleeved on the second connecting rod 22. The motor 41 drives the lead screw 42 to rotate, thereby driving the slider 43 to move linearly along the lead screw 42. The slider 43 then drives the rotation fulcrum 24 to slide and adjust its position along the second connecting rod 22.

[0038] The filling mechanism of this embodiment was installed in an automatic granule packaging machine for filling tests. The test conditions were as follows: the automatic granule packaging machine had 11 filling stations, 11 pump head pistons 32, all equally spaced, with simultaneous filling of all 11 stations at one time; the ambient temperature was 25°C, the ambient humidity was 45%, and the viscosity of the liquid granules was 2000 Pa·s. Figure 5 As shown, the measured filling speed reached 0.3 seconds / cycle. In comparison, when the traditional cylinder-driven piston structure was applied to the automatic packaging machine for agar beads, the measured filling speed under the same test conditions was 0.8 seconds / cycle. The filling mechanism of this application has a faster filling speed than the cylinder-driven method.

[0039] Furthermore, the dosage adjustment section 20 in this embodiment achieves digital control of the pump head piston 32 stroke through dynamic adjustment of the lever ratio, meeting the precise dosage requirements of 5ml volume ±0.05ml; it also supports parallel layout of more than 7-16 pump heads 33, resulting in a more compact structure.

[0040] Furthermore, in this embodiment, there are 11 pump head pistons 32, and the 11 pump head pistons 32 are evenly distributed on the mounting plate 31, which can drive the pump head pistons 32 at one time, thereby improving filling efficiency.

[0041] The pump head 33 is provided with a horizontally penetrating material channel 331. One end of the material channel 331 is a liquid extraction port and is provided with a first one-way valve 332, and the other end is a liquid discharge port and is provided with a second one-way valve 333. The pump head 33 is also provided with a vertical extraction and discharge channel 334, which is connected to the material channel 331. The pump head piston 32 can reciprocate along the extraction and discharge channel 334. When the pump head piston 32 reciprocates vertically along the pumping channel 334, the downward phase of the pump head piston 32 creates a negative pressure through the pumping channel 334, causing the first one-way valve 332 at the liquid intake port of the material channel 331 to open and draw in liquid, while the second one-way valve 333 at the liquid discharge port closes. During the upward phase of the pump head piston 32, the liquid is squeezed, forcing the first one-way valve 332 to close and the second one-way valve 333 to open, achieving directional liquid output. This action, combined with the continuous rotation of the eccentric wheel 11 driven by the servo motor, and the lever transmission of the first link 21 and the second link 22, and the linear conversion of the third link 23, completes a single filling within a 0.3-second cycle. The equidistant layout of the multiple pump head pistons 32, combined with electronic cam control, achieves the synchronization and dosage stability of 16 parallel fillings, reduces mechanical losses during forward and reverse rotation, effectively avoids gas path interference, and reduces droplet residue and cross-contamination.

[0042] Both the first check valve 332 and the second check valve 333 are duckbill valves. The first check valve 332 and the second check valve 333 achieve instantaneous opening and closing through elastic deformation. During the liquid extraction stroke of the pump head piston 32, the liquid extraction port is automatically opened and the liquid discharge port is closed. During the liquid discharge stroke, the opening and closing states are switched synchronously to reduce droplet residue and cross-contamination, and ensure the dosage consistency of multi-station filling.

[0043] The second link 22 and the third link 23 are connected by a hinge shaft 25. The second link 22 is provided with a waist hole 26 for the hinge shaft 25 to move. The elliptical groove structure of the waist hole 26 provides redundant space for axial displacement of the hinge shaft 25. When the second link 22 makes a lever-type angular displacement around the pivot point 24, its end hinge point is constrained by the pure vertical motion of the pump head filling part 30. The waist hole 26 avoids rigid interference during the conversion between circular and linear motion by means of a sliding groove trajectory extending radially along the second link 22. At the same time, the length of the waist hole 26 is precisely matched with the horizontal displacement of the second link 22 at its maximum swing angle. Under the premise of ensuring that the third link 23 outputs pure linear power, the stability of the lever ratio adjustment mechanism and the synchronous filling of multiple pump heads is not affected by motion conversion loss.

[0044] A filling method includes the following steps:

[0045] Start drive: Start the rotary drive device to drive the eccentric wheel 11 to rotate;

[0046] Drive the linkage motion: Eccentric wheel 11 drives the first link 21 to move;

[0047] Motion conversion: The first link 21 drives the second link 22 to rotate around its pivot point 24;

[0048] Power transmission: The second link 22 drives the third link 23 to move;

[0049] Drive piston: The third connecting rod 23 drives the mounting plate 31 to drive the pump head piston 32 to reciprocate vertically within the pump head 33;

[0050] Complete the pumping and discharging cycle: The pump head piston 32 performs one upward stroke to complete the pumping action and one downward stroke to complete the discharging action within the pumping and discharging channel 334 of the pump head 33; wherein, for each rotation of the eccentric wheel 11, the pump head piston 32 completes one pumping and one discharging action.

[0051] A servo motor drives the eccentric wheel 11 to rotate in one direction. Utilizing the principle of an electronic cam, the output speed of the servo motor can be adjusted to slow down the liquid extraction speed and speed up the liquid discharge speed, achieving continuous operation to complete the filling requirements without stopping the servo motor. The liquid extraction speed represents the waiting state, while the liquid discharge speed represents the working output state. Currently, the fastest filling cycle of this filling mechanism is 0.3 seconds per cycle, with a single filling volume of 5 ml. t1 represents the liquid extraction time, and t2 represents the liquid discharge time. The corresponding relationships between filling volume and time, and between motor speed and time, are as follows: Figure 5 As shown.

[0052] During the basic filling cycle, when it is necessary to adjust the single filling dosage, the target dosage parameter is input through the control panel, and the dosage adjustment servo motor located at the bottom of the rotation fulcrum 24 is started. The rotation fulcrum 24 is adjusted to translate axially along the second connecting rod 22. This movement dynamically changes the length ratio between the first lever segment and the second lever segment of the second connecting rod 22. When the rotation fulcrum 24 moves to the right, the second lever segment shortens, the pump head piston 32 reduces the liquid extraction stroke, and the dosage decreases accordingly. When the rotation fulcrum 24 moves to the left, the second lever segment lengthens, the liquid extraction stroke increases, and the dosage increases synchronously. This adjustment process is completely automatically calculated by the servo system and executed in real time without interrupting the equipment operation, thus realizing the control of the filling dosage.

[0053] The filling method in this embodiment uses a three-bar linkage structure driven by the unidirectional rotation of the eccentric wheel 11 to precisely convert the circular motion into the pure vertical stroke of the pump head piston 32, which can reduce mechanical losses in forward and reverse rotation and shorten the filling cycle to 0.3 seconds in actual tests. Combined with the servo translation mechanism of the rotating fulcrum 24 and the geometric tolerance design of the waist hole 26, the synchronous accuracy of the liquid extraction stroke of the 11 pump head pistons 32 reaches ±0.05mm, ensuring that the set filling dosage (such as 5ml, 10ml, 15ml, etc.) is accurately controlled within ±0.05ml. By controlling the low-speed liquid extraction and high-speed liquid discharge through electronic cam, the effective working time ratio can be increased. Combined with the parallel expansion capability of multiple pump heads 33, production efficiency is improved and gas path interference problems are reduced.

[0054] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A filling mechanism of a condensation bead automatic packaging machine, comprising a driving part (10), a dose adjusting part (20) and a pump head filling part (30), characterized in that: the driving part (10) comprises a rotary driving device and an eccentric wheel (11) in transmission connection with a driving shaft of the rotary driving device; the dose adjusting part (20) comprises a first connecting rod (21), a second connecting rod (22) and a third connecting rod (23); one end of the first connecting rod (21) is hingedly connected to an eccentric shaft (12) of the eccentric wheel (11), and the other end is hingedly connected to the second connecting rod (22); a rotating fulcrum (24) is arranged on the second connecting rod (22), and the second connecting rod (22) can rotate about the rotating fulcrum (24); one end of the third connecting rod (23) is hingedly connected to the second connecting rod (22); the rotating fulcrum (24) separates the second connecting rod (22) into a first lever segment and a second lever segment, and the length ratio of the first lever segment to the second lever segment is adjustable; the pump head filling part (30) comprises a mounting plate (31), a pump head piston (32) and a pump head (33); the mounting plate (31) is connected to the third connecting rod (23); the pump head piston (32) is arranged on the mounting plate (31); the pump head (33) cooperates with the pump head piston (32); the dose adjusting part (20) comprises a fulcrum adjusting mechanism, the fulcrum adjusting mechanism comprises a driving motor (41), a lead screw (42) connected to an output shaft of the driving motor (41) and a sliding block (43) in thread cooperation with the lead screw (42), the rotating fulcrum (24) is arranged on the sliding block (43), the rotating fulcrum (24) is sleeved on the second connecting rod (22), the driving motor (41) is driven to rotate the lead screw (42), thereby driving the sliding block (43) to move linearly along the lead screw (42), and the sliding block (43) drives the rotating fulcrum (24) to slide along the second connecting rod (22) to adjust the position; the pump head (33) is provided with a transverse material passage (331), one end of the material passage (331) is a liquid suction port and is provided with a first one-way valve (332), and the other end is a liquid discharge port and is provided with a second one-way valve (333); the pump head (33) is further provided with a vertical suction and discharge passage (334), the suction and discharge passage (334) is through the material passage (331), and the pump head piston (32) can reciprocate along the suction and discharge passage (334). The pump head piston (32) is a plurality of and is distributed at equal intervals on the mounting plate (31). The number of the pump head pistons (32) is 7-16. The first one-way valve (332) and the second one-way valve (333) are duckbill valves. The second connecting rod (22) and the third connecting rod (23) are connected through a hinged shaft (25); the second connecting rod (22) is provided with a waist hole (26) for the hinged shaft (25) to move. The rotary driving device is a servo motor.

2. The filling mechanism of claim 1, wherein, The method comprises the following steps:

3. The filling mechanism of claim 2, wherein, Starting driving: starting the servo motor to drive the eccentric wheel (11) to rotate.

4. The filling mechanism of claim 1, wherein, ​ 5. The filling mechanism of claim 1, wherein, ​ 6. The filling mechanism of claim 1, wherein, ​ 7. A method of filling using the filling mechanism of claim 6, characterized in that, ​ ​ Driving link motion: the eccentric wheel (11) drives the first link (21) to move; Converting motion: the first link (21) drives the second link (22) to rotate around the rotation fulcrum (24) of the second link (22); Transmitting power: the second link (22) drives the third link (23) to move; Driving piston: the third link (23) drives the mounting plate (31) to drive the pump head piston (32) to move vertically in the pump head (33); Completing the liquid pumping cycle: the pump head piston (32) completes the liquid pumping action in one upstroke and the liquid discharging action in one downstroke in the pumping channel (334) of the pump head (33); wherein the pump head piston (32) completes the liquid pumping action and the liquid discharging action once for every rotation of the eccentric wheel (11).

8. The filling method according to claim 7, characterized in that Further comprising a dose adjusting step: by adjusting the position of the rotation fulcrum (24) on the second link (22), the length ratio of the first lever segment and the second lever segment is changed to adjust the reciprocating stroke of the pump head piston (32).

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