Special output pump body for capsule forming machine and feeding method thereof

Abstract

The application relates to the technical field of pump bodies, and discloses a special output pump body for a capsule forming machine and a feeding method thereof, which comprises a pumping and discharging part and a flow control part arranged at the pumping end of the pumping and discharging part, the flow control part comprises a valve shell, an inlet pipe fixed to the periphery of the valve shell, a pumping interface pipe and an outlet pipe; a valve core is rotatably arranged in the inner cavity of the valve shell, the peripheral surface of the valve core is provided with non-communicating open grooves, the inlet pipe and the pumping interface pipe or the pumping interface pipe and the outlet pipe can be selectively connected by rotating the open grooves; the application drives the crank set to rotate through the pull rod, makes the valve core relatively rotate with the flow guide sleeve, realizes mechanical insertion or separation of the plug and the insertion hole, actively completes the smooth switching of the feeding channel and the discharging channel without difference, avoids the problem that a traditional one-way valve is not sensitive to opening and closing due to adhesion of high-viscosity colloid, and effectively overcomes the influence of viscous resistance and interface separation force on the feeding efficiency.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and more specifically to a dedicated output pump for a capsule forming machine and its feeding method. Background Technology

[0002] Soft capsule forming machines typically use dual molds to press the capsule shell (such as silicone material), and simultaneously control the injection system to complete the filling operation during the pressing process. The power source of the injection system is generally a metering pump (such as a piston pump), which transports liquid material from the storage tank to the injection port, and finally injects it into the capsule shell to form a soft capsule. When a traditional single reciprocating piston pump is used as a feeding pump, it only discharges once for each reciprocating stroke, which is an intermittent feeding method and has the problem of low feeding efficiency.

[0003] To achieve continuous material supply, existing technologies have proposed improvements. For example, Chinese patent application CN202420992305.4 discloses a reciprocating piston pump assembly and its mixer and applicator. This pump assembly includes two feed pumps, both of which are reciprocating piston pumps. The two feed pumps are arranged opposite each other and share a single piston rod. As the piston rod moves back and forth, the two feed pumps alternately supply material. The pump assembly also includes an inlet pipe and an outlet pipe. The inlet pipe has two branches that connect to the inlets of the two feed pumps, and the outlet pipe has two branches that connect to the outlets of the two feed pumps. This simplified pump assembly structure allows for continuous and uninterrupted material supply without PLC control, reducing the likelihood of errors.

[0004] However, the continuous feeding process of the reciprocating piston pump assembly mentioned above relies on two sets of check valves, including one for controlling the feed and the other for controlling the discharge. The check valves ensure the unidirectional flow of fluid within a single stroke. When applied to the conveying of high-viscosity colloidal materials, the colloidal substances easily form an adhesive layer on the valve core surface of the check valve. This adhesive layer significantly increases the viscous resistance between the valve core and the valve seat and the interfacial separation force (i.e., adhesion force) required for desorption, resulting in a decrease in the opening and closing response sensitivity of the check valve, thereby reducing the feeding efficiency of the pump. Summary of the Invention

[0005] Based on the problems raised in the background art above, the technical problem to be solved by this application is: how to solve the problem that the adhesion of colloids to the surface of the one-way valve core during the conveying of high-viscosity colloidal materials leads to increased motion resistance between the valve core and the valve seat, insensitive opening and closing response, and thus reduced feeding efficiency.

[0006] The present invention provides the following technical solution: a pump body, comprising a pumping section and a flow control section installed at its pumping end, the flow control section comprising a valve shell and three pipes fixed to its periphery, the three pipes being an inlet pipe connected to a material supply source, a pumping interface pipe connected to the pumping end of the pumping section, and an outlet pipe connected to the material receiving end; the flow control section further comprises a valve core rotatably disposed within the inner cavity of the valve shell, the end of the valve core having a spindle extending movably through a perforation in the side wall of the valve shell, and the circumferential surface of the valve core having a non-communicating open groove; by controlling the rotation and adjustment of the open groove, the inlet pipe and the pumping interface pipe or the pumping interface pipe and the outlet pipe can be selectively connected, thereby achieving the directional selection of the target flow channel.

[0007] Furthermore, a plug extends outward from the proximal end of the open trough, and a flow guide sleeve is nested inside the open trough. The inner circumferential surface of the flow guide sleeve is in contact with the trough wall of the open trough, and a flow baffle is provided on the outer circumferential surface of the flow guide sleeve. A liquid passage groove communicating with the pump material interface pipe is opened between the flow baffles, and an insertion hole corresponding to the plug is opened at the end of the flow guide sleeve. By controlling the rotation of the valve core, the plugs on both sides are alternately inserted into or separated from the corresponding insertion holes, thereby realizing the switching between the feed channel and the discharge channel.

[0008] Furthermore, the inner cavity of the valve body is a cylindrical chamber, and the valve core extends axially along the cylindrical chamber with their ends abutting each other; the longitudinal section of the open groove is arc-shaped, and its axial width is at least greater than the inner diameter of the three pipelines; the longitudinal section of the guide sleeve is arc-shaped, and it abuts against the end side wall of the open groove, and the baffle strip extends axially to the same width as the guide sleeve; above the baffle strip, the left and right outer walls of the guide sleeve and the inner wall of the valve body form two independent narrow channels for the fluid medium to pass through.

[0009] Furthermore, there is static friction between the baffle strip and the inner wall of the valve body. The plug inserted into the same side hole can overcome the frictional resistance and drive the guide sleeve to rotate as a whole. The range of motion of the right baffle strip is constrained between the pump material interface pipe and the feed pipe, and the range of motion of the left baffle strip is constrained between the pump material interface pipe and the discharge pipe, so as to maintain the open and closed state of the feed channel and the discharge channel during the whole rotation.

[0010] Furthermore, the liquid passage groove is the only channel connecting the inner cavity of the guide sleeve and the pump material interface pipe. Within the rotation range of the guide sleeve as it rotates with the valve core, the arc length of the liquid passage groove ensures that the inner cavity of the guide sleeve is always connected to the pump material interface pipe, thereby achieving synchronous control of the opening and closing of the feed pipe and the discharge pipe.

[0011] Furthermore, a crank assembly is fixed to the end of the spindle, the crank assembly includes a rocker arm sleeved on the end of the spindle, and the bottom end of the rocker arm extends out of the drive handle; the pumping section includes a pump housing and a piston assembly inside it, the piston assembly and the drive handle are connected by an arm drive, so as to complete the expansion or compression stroke by linking the piston assembly with the arm, thereby realizing the directional feeding of the fluid medium.

[0012] Furthermore, the piston assembly includes a plug head that can move along the pump housing toward or away from the flow control section, a plug rod fixed to the end of the plug head, and a pin that passes through the plug rod laterally. The side wall of the pump housing is provided with a guide slide for the pin to slide. The plug head and the inner wall of the pump housing enclose a variable liquid cavity, and the guide slide does not interfere with the formation of the liquid cavity to prevent leakage.

[0013] Furthermore, the two ends of the boom are rotatably connected to the drive handle and the pin, respectively. The boom includes a telescopic forearm and a retractable rear arm to adjust the arm length. In the initial stage of flow channel switching, the retraction or extension of the boom provides a buffer space for flow channel reversal, so as to delay the stroke drive, thereby achieving the coordinated cooperation between flow channel adjustment and continuous feeding, and completing the directional supply of fluid medium during the stroke.

[0014] Furthermore, a base is installed below the exhaust section and the flow control section. A rail frame is fixed to the surface of the base on the outer side of the crank assembly. A pull rod is slidably connected to the inner side of the rail frame. The sliding pin at the end of the pull rod is slidably connected to the relief opening on the swing arm, so that the sliding pin can slide adaptively along the relief opening when moving horizontally to compensate for distance changes and realize continuous rotation of the crank assembly. A drive device for controlling the horizontal movement of the pull rod is installed on the rail frame.

[0015] A feeding method, based on the aforementioned pump body, includes the following steps:

[0016] S1, Reversing to feed: The drive unit drives the valve core to rotate, switching the discharge channel to the feed channel, while shortening the arm length to buffer the drive of the piston group;

[0017] S2, Expansion Stroke: Continue to drive the piston assembly to perform the expansion stroke, and under negative pressure, draw in the fluid medium through the feed channel;

[0018] S3, Reversing discharge: The drive unit reverses the rotation of the valve core, switching the feed channel to the discharge channel, and at the same time extends the length of the arm to buffer the drive of the piston group;

[0019] S4, Compression Stroke: Continue to drive the piston assembly in reverse to perform the compression stroke, and discharge the fluid medium through the discharge channel under high pressure.

[0020] The technical effects and advantages of this invention are as follows:

[0021] The crank assembly is rotated by a pull rod, causing the valve core and the guide sleeve to rotate relative to each other, achieving mechanical insertion or removal of the plug and the insertion hole. This actively and smoothly switches between the feed and discharge channels, avoiding the problem of insensitive valve opening and closing caused by the adhesion of high-viscosity colloids in traditional one-way valves. It effectively overcomes the impact of viscous resistance and interface separation force on the feeding efficiency. The expansion or compression stroke of the piston assembly linked by the arm completes the directional feeding of the fluid medium. At the same time, in the initial stage of the flow channel switching, the arm retraction or extension action provides a buffer space for the flow channel reversal, causing the stroke drive to lag. This achieves the coordinated operation of the reciprocating pump body flow channel adjustment and continuous feeding, significantly improving the conveying efficiency of high-viscosity fluid media and meeting the requirements of soft capsule forming machines for continuous, stable, and efficient feeding of the drug injection system. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the present invention.

[0024] Figure 3 For the present invention Figure 2 Diagram of the central structure and its local cross-section.

[0025] Figure 4 This is a front view schematic diagram of the extraction section, flow control section, crank assembly, boom, and tie rod of the present invention during the compression stroke stage.

[0026] Figure 5 For the present invention Figure 4 Schematic diagram of the exploded structure of the central control flow section and crank assembly.

[0027] Figure 6 For the present invention Figure 5 A schematic diagram of the remaining structure after removing half of the valve housing and crank assembly.

[0028] Figure 7 This is a schematic diagram of the valve body, feed pipe, pump material interface pipe and discharge pipe of the present invention.

[0029] Figure 8 This is a three-dimensional schematic diagram of the valve core structure of the present invention.

[0030] Figure 9 This is a front view schematic diagram of the cross-sectional structure of the valve core of the present invention.

[0031] Figure 10 This is a three-dimensional schematic diagram of the flow guide sleeve structure of the present invention.

[0032] Figure 11 This is a front view schematic diagram of the cross-sectional structure of the guide sleeve of the present invention.

[0033] Figure 12 For the present invention Figure 4 A front view of the cross-sectional structure of the central control flow section.

[0034] Figure 13 This is a front view schematic diagram of the exhaust section, flow control section, crank assembly, arm and tie rod of the present invention in the reversing buffer stage.

[0035] Figure 14 For the present invention Figure 13 A front view of the cross-sectional structure of the central control flow section.

[0036] Figure 15 This is a front view schematic diagram of the exhaust section, flow control section, crank assembly, boom, and tie rod of the present invention during the expansion stroke stage.

[0037] Figure 16 For the present invention Figure 15 A front view of the cross-sectional structure of the central control flow section.

[0038] The attached figures are labeled as follows: 1. Pumping section; 11. Pump housing; 12. Plug; 13. Plug rod; 14. Pin; 15. Guide slide; 2. Flow control section; 21. Valve housing; 211. Perforation; 22. Feed pipe; 23. Pump material interface pipe; 24. Discharge pipe; 25. Valve core; 251. Mandrel; 252. Open groove; 253. Plug; 26. Guide sleeve; 261. Baffle strip; 262. Liquid passage groove; 263. Insertion hole; 3. Crank assembly; 31. Swing arm; 32. Drive handle; 33. Recessed opening; 34. Positioning hole; 4. Arm; 41. Front arm; 42. Rear arm; 5. Tie rod; 51. Sliding pin; 6. Rail frame; 7. Connecting piece; 8. Drive cylinder; 9. Joint; 10. Base. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The capsule forming machine-specific output pump body and its feeding method involved in the present invention are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1, refer to Figure 1 , Figures 5 to 12 , Figure 14 as well as Figure 16This invention provides a dedicated output pump body for a capsule forming machine and its feeding method, including a pumping section 1 and a flow control section 2 installed at its pumping end; wherein the flow control section 2 includes a valve housing 21 and three pipes fixed to its periphery, the three pipes being an inlet pipe 22 connected to the feeding source, a pumping interface pipe 23 connected to the pumping end of the pumping section 1, and an outlet pipe 24 connected to the material receiving end (capsule forming machine); the flow control section 2 also includes a valve core 25 rotatably disposed in the inner cavity of the valve housing 21, the end of the valve core 25 having a spindle 251 extending movably through a perforation 211 in the side wall of the valve housing 21, and the circumferential surface of the valve core 25 having a non-connected open groove 252; by controlling the rotation and adjustment of the open groove 252, the inlet pipe 22 and the pumping interface pipe 23 or the pumping interface pipe 23 and the outlet pipe 24 can be selectively connected to achieve target flow channel orientation selection;

[0041] A plug 253 extends outward from the proximal end of the open channel 252; a guide sleeve 26 with a circumference slightly smaller than that of the open channel 252 is nested inside the open channel 252. The inner circumferential surface of the guide sleeve 26 is in contact with the channel wall of the open channel 252. The outer circumferential surface of the guide sleeve 26 is integrally formed with baffle strips 261 located on the upper and lower sides of the pump feed interface pipe 23 and in contact with the inner wall of the valve housing 21. A liquid passage groove 262 is opened between the baffle strips 261, which is always uniquely connected to the pump feed interface pipe 23. The ends of 26 are respectively provided with insertion holes 263 corresponding to the plugs 253 on the same side; by controlling the rotation of the valve core 25, the plug 253 on the right side is gradually pulled out of the insertion hole 263 on the same side and the plug 253 on the left side is gradually inserted into the insertion hole 263 on the same side, or the plug 253 on the left side is gradually pulled out of the insertion hole 263 on the same side and the plug 253 on the right side is gradually inserted into the insertion hole 263 on the same side, thereby realizing a fast and unobstructed connection between the feeding channel and the discharging channel;

[0042] The valve housing 21 has a cylindrical inner cavity, and the valve core 25 extends axially along this cylindrical cavity with their ends abutting each other. The longitudinal section of the open groove 252 is arc-shaped, and its axial width is at least greater than the inner diameter of the three pipes. The longitudinal section of the guide sleeve 26 is arc-shaped, and it abuts against the end wall of the open groove 252. The baffle strip 261 extends axially to the same width as the guide sleeve 26. Above the baffle strip 261, the left and right outer walls of the guide sleeve 26 are flush with the valve core 25. Two independent narrow channels for fluid medium to pass through are formed between the inner walls of the shell 21; the opening and closing of the following channels can be coordinated and controlled by selective docking or separation of the plug 253 and the insertion hole 263 on the same side: the feed channel constructed by the pump material interface pipe 23, the liquid passage 262, the right insertion hole 263, the narrow channel and the feed pipe 22, or the discharge channel constructed by the pump material interface pipe 23, the liquid passage 262, the left insertion hole 263, the narrow channel and the discharge pipe 24.

[0043] Reference Figure 9 , Figure 12 as well as Figure 14As shown, there is static friction between the baffle strip 261 and the inner wall of the valve housing 21 it contacts, and it remains stationary when not pushed by external mechanical force. The plug 253 inserted into the same side hole 263 can overcome the frictional resistance between the baffle strip 261 and the inner wall of the valve housing 21, and push the guide sleeve 26 to rotate in the same direction of rotation. The range of motion of the right baffle strip 261 is constrained between the pump material interface pipe 23 and the feed pipe 22, and the range of motion of the left baffle strip 261 is constrained between the pump material interface pipe 23 and the discharge pipe 24. This forms a flow channel maintenance, that is, the feed channel and the discharge channel are kept in an open and closed state during the integral rotation, thus constructing a single flow channel.

[0044] The liquid passage 262 is the only channel connecting the inner cavity of the guide sleeve 26 and the pump material interface pipe 23. Within the rotation range where the guide sleeve 26 rotates together with the valve core 25, the arc length of the liquid passage 262 should be set so that the inner cavity of the guide sleeve 26 is always connected to the pump material interface pipe 23, thereby forming synchronous control of the opening and closing of the feed pipe 22 and the discharge pipe 24.

[0045] In Example 2, to achieve coordinated control of the flow channel selection and adjustment within the flow control unit 2 and the pumping action of the extraction and discharge unit 1, and to ensure the overall coordination and stability of the equipment, further optimization of the equipment is required. Specifically, refer to... Figures 1 to 6 , Figure 13 as well as Figure 15 As shown, a crank assembly 3 is fixed to the end of the spindle 251. The crank assembly 3 includes a rocker arm 31 that is fixedly sleeved on the end surface of the spindle 251 through a positioning hole 34. The rocker arm 31 is boomerang-shaped, and a drive handle 32 extends axially from its bottom end. The pumping unit 1 includes a pump housing 11 and a piston assembly that is movably sleeved inside it. The piston assembly and the drive handle 32 are connected by a lever 4. The expansion or compression stroke of the piston assembly is linked by the lever 4 to complete the directional feeding of the fluid medium.

[0046] The piston assembly includes a plug 12 that can move along the pump housing 11 toward or away from the flow control part 2, a plug rod 13 fixed to the end of the plug 12, and a pin 14 that is laterally fixed through the plug rod 13. The side wall of the pump housing 11 is provided with a guide slide 15 for the pin 14 to slide horizontally. The end of the plug 12 away from the plug rod 13 is enclosed with the inner wall of the pump housing 11 to form a variable liquid cavity. The position of the guide slide 15 does not interfere with the formation of the variable liquid cavity to prevent liquid leakage.

[0047] The two ends of the boom 4 are rotatably connected to the drive handle 32 and the pin 14, respectively. The boom 4 includes a telescopic front arm 41 and a rear arm 42, so that the arm length of the boom 4 is adjustable. In the initial stage of flow channel switching, the boom 4 provides a buffer space for flow channel reversal by retracting or extending the arm, so that the stroke drive is delayed, thereby realizing the coordinated cooperation between the reciprocating pump body flow channel adjustment and continuous material supply, and completing the directional supply of fluid medium during the stroke.

[0048] A base 10 for providing support is installed below the exhaust section 1 and the flow control section 2. A rail frame 6 fixed to the surface of the base 10 is provided on the outer side of the crank assembly 3. A pull rod 5 is slidably connected to the inner side of the rail frame 6. The sliding pin 51 at the end of the pull rod 5 is slidably connected to the relief opening 33 opened in the section above the swing arm 31. The relief opening 33 extends a predetermined length radially along the positioning hole 34, so that the sliding pin 51 can slide adaptively along the relief opening 33 when it moves horizontally, so as to compensate for the change in the distance between the sliding pin 51 and the center of the positioning hole 34, and realize the continuous rotation of the crank assembly 3.

[0049] A drive device for controlling the horizontal movement of the tie rod 5 is installed on the rail frame 6. The drive device can be a drive cylinder 8 fixed to the outside of the rail frame 6. The output shaft of the drive cylinder 8 is fixedly connected to the tie rod 5 via a connector 7. The tie rod 5 is driven to move linearly and reciprocally by the extension and retraction of the drive cylinder 8.

[0050] The end of the discharge pipe 24 may also be equipped with a connector 9, and connected to material-using equipment such as a capsule forming machine via the connector 9.

[0051] Working principle of this invention:

[0052] S1, Reversing the feeding direction: The drive unit horizontally pulls the pull rod 5 to the side away from the flow control section 2, causing the sliding pin 51 to begin moving closer to the center line of the spindle 251. The sliding pin 51 can slide relative to the relief opening 33 and apply a leftward pulling force to the crank assembly 3, causing the crank assembly 3 to rotate counterclockwise around the positioning hole 34 as the reference axis (e.g., Figures 4 to 13 (As shown in the diagram); on the one hand, the valve core 25 rotates as a whole via the spindle 251, which is coaxially fixed with the positioning hole 34, causing the right-side plug 253 to gradually withdraw from the same-side insertion hole 263, while the left-side plug 253 gradually inserts into the same-side insertion hole 263 (as shown in the diagram). Figures 12 to 14The changes shown indicate that the discharge channel and feed channel for the fluid medium are switched: as the plug 253 on the left and the insertion hole 263 gradually engage, the original discharge channel, which was from the pump feed interface pipe 23 → liquid channel 262 → left insertion hole 263 → the narrow passage between the outer wall of the left guide sleeve 26 and the inner wall of the valve housing 21 → discharge pipe 24, is blocked; while the plug 253 on the right and the insertion hole 263 on the right gradually disengage, so that the feed pipe 22 → the narrow passage between the outer wall of the right guide sleeve 26 and the inner wall of the valve housing 21 → right insertion hole 263 → liquid channel 262 → ... The feed channel of the pump feed interface pipe 23 is opened, thereby achieving a smooth and seamless switching between the valve chamber discharge and feed channels. This active mechanical action overcomes the problems of viscous fluid resistance and insensitive opening and closing response. On the other hand, when the drive handle 32 initially rotates counterclockwise around the positioning hole 34 as the reference axis, the adjusting end of the front arm 41 gradually inserts into the rear arm 42. That is, by actively shortening the arm length of the arm 4, the driving force of the drive handle 32 is released, thereby avoiding triggering the piston assembly to move during this channel switching process, and providing it with a spatial buffer transition (such as...). Figures 4 to 13 (The changes shown)

[0053] S2, Extended Stroke: As the pull rod 5 continues to move horizontally to the left, the sliding pin 51 further approaches and gradually crosses the centerline position of the spindle 251, continuously applying a leftward pulling force to the crank assembly 3, causing the crank assembly 3 to continue rotating counterclockwise around the positioning hole 34 as the reference axis until it reaches the rotation limit position (e.g., Figures 13 to 15 (As shown in the diagram); on the one hand, the valve core 25 continues to rotate synchronously with the crank assembly 3, so that the plug 253 inserted into the left insertion hole 263 can overcome the frictional resistance between the baffle strip 261 and the inner wall of the valve housing 21, and push the guide sleeve 26 to rotate in a counterclockwise direction. During this process, only the feed channel of the feed pipe 22 → the narrow passage between the outer wall of the right guide sleeve 26 and the inner wall of the valve housing 21 → the right insertion hole 263 → the liquid passage 262 → the pump feed interface pipe 23 remains unobstructed (as shown in the diagram). Figures 14 to 16 The changes shown provide decisive conditions for the pumping of material in the pumping section 1; on the other hand, in the middle and later stages of the rotation of the drive handle 32 counterclockwise around the positioning hole 34 as the reference axis, the arm 4, which has completed the retraction action, delivers the driving force of the drive handle 32 to the piston assembly, causing the plug head 12 to gradually move horizontally to the right along the pump housing 11, forming a negative pressure zone inside the pump housing 11. The material source connected to the outside of the feed pipe 22 continuously enters the negative pressure zone through the unobstructed feed channel, realizing automatic feeding of the fluid medium (such as...). Figures 13 to 15 (The changes shown)

[0054] S3, Reversing Discharge: The drive unit horizontally pushes the pull rod 5 towards the side closer to the flow control section 2, causing the sliding pin 51 to begin to retract and reset, and applying a rightward thrust to the crank assembly 3, causing the crank assembly 3 to rotate clockwise around the positioning hole 34 as the reference axis; on the one hand, the mandrel 251, which is coaxially fixed with the positioning hole 34, drives the valve core 25 to rotate as a whole, causing the left plug 253 to gradually withdraw from the same side insertion hole 263, while the right plug 253 gradually inserts into the same side insertion hole 263, thereby realizing the re-switching of the feed channel and the discharge channel for the flow of fluid medium: that is, as the right plug 253 and the insertion hole 263 gradually insert, the originally unobstructed feed pipe 22 → the narrow passage between the outer wall of the right guide sleeve 26 and the inner wall of the valve body 21 → the right insertion hole 263 The feed channel from hole 263 to liquid channel 262 to pump feed interface pipe 23 is blocked; while the plug 253 on the left side and the insertion hole 263 are gradually pulled out, so that the discharge channel from pump feed interface pipe 23 to liquid channel 262 to left insertion hole 263 to the narrow passage between the outer wall of the left guide sleeve 26 and the inner wall of the valve body 21 to discharge pipe 24 is reopened, thereby realizing a seamless and smooth switching of the valve cavity feed / discharge flow channel; on the other hand, when the drive handle 32 rotates clockwise with the positioning hole 34 as the reference axis in the initial stage, the adjusting end of the front arm 41 gradually withdraws from the rear arm 42, that is, by actively extending the arm length of the arm rod 4 to transmit the pull-back force of the drive handle 32, thereby avoiding triggering the piston group to move during this flow channel switching process, and giving it a spatial buffer transition;

[0055] S4, Compression Stroke: As the pull rod 5 continues to move horizontally to the right, the sliding pin 51 further approaches and gradually crosses the centerline position of the spindle 251 (opposite side), continuously applying a rightward thrust to the crank assembly 3, causing the crank assembly 3 to continue rotating clockwise around the positioning hole 34 as the reference axis until it reaches the reverse rotation limit position (initial position); on the other hand, the valve core 25 continues to rotate synchronously with the crank assembly 3, allowing the plug 253 inserted into the right insertion hole 263 to overcome the frictional resistance between the baffle strip 261 and the inner wall of the valve housing 21, pushing the guide sleeve 26 to rotate clockwise as a whole. During this process, only the discharge channel of the pump material interface pipe 23 → liquid channel 262 → left insertion hole 263 → the narrow passage between the outer wall of the left guide sleeve 26 and the inner wall of the valve housing 21 → discharge pipe 24 remains unobstructed, providing decisive conditions for the discharge of the pumping and discharging section 1 (ultimately reaching...). Figure 12 (as shown in the state); On the other hand, in the middle and later stages when the drive handle 32 rotates clockwise around the positioning hole 34 as the reference axis, the arm 4, which has completed the extension action, delivers the pull-back force of the drive handle 32 to the piston assembly, causing the plug head 12 to gradually move horizontally to the left along the pump housing 11. A high-pressure zone is formed inside the pump housing 11, and the fluid medium inside is continuously pushed out through the discharge pipe 24 to the input end of the capsule forming machine through the unobstructed discharge channel, thereby realizing the automatic discharge of the fluid medium.

[0056] By continuously performing the above S1 to S4 cyclic steps, continuous material supply to the reciprocating pump body is achieved, as well as automatic adjustment of the flow channel and coordinated operation of the stroke motion, thereby overcoming the resistance constraints in the process of transporting high-viscosity fluid media.

[0057] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, in accordance with the technical plan and its improved concept, should be included under the protection of the present invention.

Claims

1. A pump body, comprising a pumping section (1) and a flow control section (2) installed at its pumping end, characterized in that: The flow control unit (2) includes a valve housing (21) and three pipes fixed to its periphery. The three pipes are a feed pipe (22) connected to the material supply source, a pump interface pipe (23) connected to the pump end of the pumping unit (1), and a discharge pipe (24) connected to the material receiving end. The flow control unit (2) also includes a valve core (25) that can be rotatably disposed in the inner cavity of the valve housing (21). The end of the valve core (25) has a spindle (251) that can be moved through the perforation (211) on the side wall of the valve housing (21). The circumferential surface of the valve core (25) is provided with an open groove (252) that is not connected. By controlling the rotation and adjustment of the open groove (252), the feed pipe (22) and the pump interface pipe (23) or the pump interface pipe (23) and the discharge pipe (24) can be selectively connected to achieve the directional selection of the target flow channel.

2. The pump body according to claim 1, characterized in that: The open channel (252) has a plug (253) extending outward from the near end. A guide sleeve (26) is nested inside the open channel (252). The inner circumferential surface of the guide sleeve (26) is in contact with the channel wall of the open channel (252). The outer circumferential surface of the guide sleeve (26) is provided with a baffle strip (261). A liquid passage groove (262) connected to the pump material interface pipe (23) is opened between the baffle strips (261). The end of the guide sleeve (26) is provided with a corresponding insertion hole (263) corresponding to the plug (253). By controlling the rotation of the valve core (25), the plugs (253) on both sides are alternately inserted or separated from the corresponding insertion holes (263), thereby realizing the switching between the feed channel and the discharge channel.

3. The pump body according to claim 2, characterized in that: The inner cavity of the valve housing (21) is a cylindrical chamber, and the valve core (25) extends axially along the cylindrical chamber and the two ends abut against each other; the longitudinal section of the open groove (252) is arc-shaped, and its axial width is at least greater than the inner diameter of the three pipes; the longitudinal section of the guide sleeve (26) is arc-shaped, and it abuts against the end side wall of the open groove (252), and the baffle strip (261) extends axially to the same width as the guide sleeve (26); above the baffle strip (261), the left and right outer walls of the guide sleeve (26) and the inner wall of the valve housing (21) form two independent narrow channels for the fluid medium to pass through.

4. The pump body according to claim 3, characterized in that: There is static friction between the baffle strip (261) and the inner wall of the valve body (21). The plug (253) inserted into the same side hole (263) can overcome the frictional resistance and drive the guide sleeve (26) to rotate as a whole. The range of motion of the right baffle strip (261) is restricted between the pump material interface pipe (23) and the feed pipe (22), and the range of motion of the left baffle strip (261) is restricted between the pump material interface pipe (23) and the discharge pipe (24) so ​​as to maintain the opening and closing state of the feed channel and the discharge channel during the integrated rotation.

5. The pump body according to claim 4, characterized in that: The liquid passage (262) is the only channel connecting the inner cavity of the guide sleeve (26) and the pump material interface pipe (23). Within the rotation range of the guide sleeve (26) as it rotates with the valve core (25), the arc length of the liquid passage (262) ensures that the inner cavity of the guide sleeve (26) is always connected to the pump material interface pipe (23), so as to achieve synchronous selection and control of the opening and closing of the feed pipe (22) and the discharge pipe (24).

6. The pump body according to claim 1, characterized in that: The end of the spindle (251) is fixed with a crank assembly (3), which includes a swing arm (31) sleeved on the end of the spindle (251), and the bottom end of the swing arm (31) extends out of the drive handle (32). The pumping unit (1) includes a pump housing (11) and a piston assembly inside it. The piston assembly and the drive handle (32) are connected by a drive arm (4). The piston assembly is linked by the drive arm (4) to complete the expansion or compression stroke, thereby achieving directional feeding of the fluid medium.

7. The pump body according to claim 6, characterized in that: The piston assembly includes a plug (12) that can move along the pump housing (11) toward or away from the flow control part (2), a plug rod (13) fixed to the end of the plug (12), and a pin (14) that passes through the plug rod (13) laterally. The side wall of the pump housing (11) is provided with a guide slide (15) for the pin (14) to slide. The plug (12) and the inner wall of the pump housing (11) enclose a variable liquid cavity, and the guide slide (15) does not interfere with the formation of the liquid cavity to prevent leakage.

8. The pump body according to claim 6, characterized in that: The two ends of the arm (4) are rotatably connected to the drive handle (32) and the pin (14) respectively. The arm (4) includes a telescopic front arm (41) and a rear arm (42) to adjust the arm length. In the initial stage of channel switching, the arm (4) is retracted or extended to provide buffer space for channel reversal, so that the stroke drive is delayed, so as to realize the coordinated cooperation between channel adjustment and continuous feeding, and complete the directional supply of fluid medium in the stroke.

9. The pump body according to claim 6, characterized in that: A base (10) is installed below the exhaust section (1) and the flow control section (2). A rail frame (6) is fixed to the surface of the base (10) on the outside of the crank assembly (3). A pull rod (5) is slidably connected to the inside of the rail frame (6). The sliding pin (51) at the end of the pull rod (5) is slidably connected to the relief opening (33) on the swing arm (31), so that the sliding pin (51) slides adaptively along the relief opening (33) when it moves horizontally to compensate for the distance change and realize the continuous rotation of the crank assembly (3). A drive device for controlling the horizontal movement of the pull rod (5) is installed on the rail frame (6).

10. A feeding method, based on the pump body of claim 9, characterized in that: Includes the following steps: S1, Reversing to feed: The drive unit drives the valve core (25) to rotate, switching the discharge channel to the feed channel, and at the same time shortens the length of the arm (4) to buffer the drive of the piston group; S2, Expansion Stroke: Continue to drive the piston assembly to perform the expansion stroke, and under negative pressure, draw in the fluid medium through the feed channel; S3, Reversing discharge: The drive device reverses the rotation of the valve core (25), switching the feed channel to the discharge channel, and at the same time extends the length of the arm (4) to buffer the drive of the piston group; S4, Compression Stroke: Continue to drive the piston assembly in reverse to perform the compression stroke, and discharge the fluid medium through the discharge channel under high pressure.

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