A pump body for a multi-mode quantitative output capsule forming machine

Abstract

This invention relates to the field of pump body technology and discloses a pump body for a multi-mode quantitative output capsule forming machine, including a pump housing and a plug rod disposed therein. The plug rod includes a mandrel, an upper guide shaft, a lower guide shaft, and a drive pin. A movable plug is movably disposed at the top of the mandrel and penetrated by the upper guide shaft. The movable plug has a radially telescopic locking part to realize the locking and unlocking of the mandrel and the movable plug. A baffle ring and a protrusion for triggering unlocking are provided on the inner wall of the pump housing. A rotary shifting sleeve is provided in the inner cavity of the pump housing and is movably connected to the drive pin. When locking and moving downward to extract material, the drive pin drives the rotary shifting sleeve to move downward and approach the turntable. After unlocking, the drive pin drives the capsule forming machine to shift from the feeding area to the spraying area and rotate back to reset during the upward movement after the downward movement, automatically applying a release agent in the gap between the pumping materials. This invention utilizes the gap between the pumping materials to automatically apply a release agent, reducing equipment costs, avoiding capsule breakage and deformation, ensuring stable feeding, improving demolding quality and efficiency, and has a compact structure and reliable operation.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and more specifically to a pump body for a multi-mode quantitative output capsule forming machine. Background Technology

[0002] Capsule molding machines are widely used to compress silicone and other gelatinous materials into capsule products. In existing technologies, capsule molding machines typically use a double mold to press the gelatinous material, and the delivery of the gelatinous material is performed by a piston reciprocating pump. Specifically, by driving the piston to make reciprocating linear motion in the cylinder, alternating negative pressure intake and positive pressure discharge, the gelatinous material is continuously drawn in and pressurized from the hopper through a one-way valve group, and then quantitatively delivered to the injection unit of the molding machine through a high-pressure resistant pipeline. The injection unit accurately injects the gelatinous material into the preheated and closed cavity, and then the mold closing system applies a clamping force, so that the gelatinous material completes the vulcanization and cross-linking reaction under the set temperature and pressure. Finally, the mold is opened and the molded capsule product is taken out, thus realizing the coordinated cooperation between the pump's delivery power and the molding machine's pressing action.

[0003] For example, Chinese patent document CN201220022671.4 discloses a soft capsule machine, which includes a machine head, left and right molds, a spray body, a feeding pump, left and right gelatin rollers, left and right gelatin boxes, left and right glue-pulling rollers, a touch screen, and a PLC electrical control system. The machine head is also equipped with a left mold shaft servo reduction motor and a right mold shaft servo reduction motor. The feeding pump is equipped with a pump spindle servo reduction motor and a pump spindle gear rack assembly. The pump spindle servo reduction motor is connected to the pump spindle and the pump spindle gear rack assembly, and drives the guide plate and the pump plunger to reciprocate through the pump spindle gear rack assembly. The soft capsule machine is driven by four independent precision servo reduction motors, which drive the left and right mold spindles, pump plungers, and pump reversing respectively. The various actions are automatically controlled by a precision servo controller and PLC control technology, realizing automatic alignment of the left and right main shaft molds and automatic adjustment of the filling amount, which increases the output of the soft capsule machine by more than 100%.

[0004] However, in actual production, the solidified capsule adheres tightly to the mold surface. If it is forcibly demolded directly, it is easy to cause the capsule to break or deform. Therefore, it is necessary to apply a release agent (usually a release agent or release agent) to the mold surface before the material is injected into the cavity to form an extremely thin release film, thereby reducing the adhesion between the capsule and the mold. In the existing technology, operators usually try to apply the agent manually during the pumping process (i.e., the gap before the material is sent into the cavity). However, this time window is extremely short, and manual operation is difficult to grasp accurately. The repeatability of the application position and amount is poor, and the demolding effect is unstable. If an additional independent automatic application system is added, it will significantly increase the operating and manufacturing costs of the equipment, and it will also occupy space and be complicated to maintain. Summary of the Invention

[0005] The technical problem that this application aims to solve is: how to accurately and promptly apply release agent to the mold surface using the gap between pump materials without significantly increasing equipment costs, so as to avoid capsule breakage or deformation during demolding.

[0006] This invention provides the following technical solution: a pump body for a multi-mode quantitative output capsule forming machine, comprising a pump housing and a piston rod coaxially sleeved therein and capable of axial extension and retraction. The piston rod includes a mandrel, an upper guide shaft and a lower guide shaft respectively fixed to the top and bottom walls of the mandrel and extending axially, and a drive pin extending radially from the bottom end of the lower guide shaft; a movable plug is movably provided at the top of the mandrel, which is always penetrated by the upper guide shaft, and a locking part is provided inside the movable plug that can extend and retract radially when subjected to external pressure, thereby locking the mandrel and the movable plug through the extension and retraction of the locking part. The pump housing has a retaining ring on its inner wall to intercept the movable plug and a protrusion fixed above the retaining ring to trigger unlocking. The pump housing cavity is equipped with a rotating shifting sleeve that is movably connected to the drive pin. When the mandrel is locked with the movable plug and moves down to extract material, the drive pin drives the rotating shifting sleeve to move down as a whole to approach the center of the turntable. When the mandrel is unlocked from the movable plug, the drive pin drives the capsule forming machine to shift from the feeding area to the spraying area and rotate back to reset during the upward movement after the downward movement, so as to achieve automatic application of release agent during the gap between pump body material extraction and discharge.

[0007] Furthermore, the bottom surface of the movable plug is provided with a groove for the top end of the mandrel to be inserted. The groove is surrounded by a receiving groove that is radially connected to it. The receiving groove is equipped with a locking part, which includes a first spring fixed deep in the receiving groove and a locking tongue installed at the end of the first spring and slidable along the receiving groove. The end of the locking tongue near the mandrel is a wedge-shaped head that is inclined from top to bottom away from the mandrel. The peripheral wall of the mandrel is provided with a slot that fits into the wedge-shaped head. Under the elastic force of the first spring, the locking tongue radially abuts against the slot to achieve locking.

[0008] Furthermore, the bottom surface of the movable plug is provided with a through hole located directly above the protrusion and communicating with the receiving groove; the middle of the latch is provided with a relief cavity, which has a certain inner width along the extension direction of the receiving groove, and has an inclined surface on the side near the first spring that matches the contact surface of the protrusion, the inclination direction of which is consistent with the wedge head; when the first spring is not compressed by external force, the bottom corner of the relief cavity on the side near the first spring is located above the through hole, so that the protrusion passes through the through hole and is inserted into the relief cavity, the latch under pressure slides away from the spindle and compresses the first spring to store force, so that the wedge head is withdrawn from the slot to achieve unlocking.

[0009] Furthermore, there is a liquid cavity between the movable plug and the inner wall of the pump housing, the volume of which changes with the rise and fall of the movable plug. A feed pipe and a discharge pipe are respectively installed on the top of the liquid cavity, and both the feed pipe and the discharge pipe are equipped with a one-way valve. The feed pipe is connected to the supply source for storing the adhesive liquid, and the discharge pipe is connected to the injection section installed on the periphery of the pump housing. The discharge end of the injection section can be aligned with the feed end of the capsule forming machine installed off-center from the turntable. A mold release agent spraying section is provided above the extreme position of the capsule forming machine's rotation and repositioning. Through the mold release agent spraying section, atomized mold release agent can be introduced into the unfilled cavity.

[0010] Furthermore, the rotary positioning sleeve has an insertion cavity, and the inner circumferential wall of the insertion cavity has a circumferentially coiled spiral groove, the end of the drive pin being slidably embedded in the spiral groove; a guide pin extends radially from the outer circumferential wall of the rotary positioning sleeve, and a guide groove is provided on the circumference of the pump housing for the guide pin to slide to constrain its movement direction; when the mandrel is locked and moved downward with the movable plug, the liquid cavity expands, and the drive pin pushes the rotary positioning sleeve downward toward the turntable; when the mandrel is unlocked from the bottom of the movable plug and continues to move downward, the liquid cavity is stabilized, and the drive pin drives the rotary positioning sleeve and the turntable that is in contact with it to rotate together, realizing the displacement of the capsule forming machine.

[0011] Furthermore, the guide groove is L-shaped, consisting of a longitudinal groove and a transverse groove. The length of the longitudinal groove is not less than the descent distance when the mandrel and the movable plug are locked together and moved. The length of the transverse groove is not less than the descent distance after the mandrel is unlocked from the bottom of the movable plug.

[0012] Furthermore, the pump casing and the turntable are connected via a support base, which includes a base supported on the ground and a gantry frame fixed to the base and extending upward to the top of the pump casing; the turntable includes a turntable rotatably mounted on the top wall of the base and a positioning block fixed to the center of the turntable; after the rotating sleeve descends to its limit position, it contacts the positioning block, and the two are driven by static friction or a magnetic attraction structure, so that during rotational positioning, the rotating sleeve can drive the turntable and the capsule forming machine mounted above it to change position together via the positioning block.

[0013] Furthermore, it also includes a displacement monitoring system and a control system. The displacement monitoring system is set in the material conveying area and the spraying area after the capsule forming machine is displaced. When the capsule forming machine is detected to have reached the spraying area, it sends an electrical signal to the control system. The control system then controls the release agent spraying section to automatically introduce a certain amount of atomized release agent into the cavity.

[0014] Furthermore, an intercepting part is installed on the periphery of the pump casing, spanning the upper and lower sides of the baffle ring. The intercepting part includes a lever arm hinged to the shaft seat. The top and bottom ends of the lever arm are rotatably connected to an intercepting head that traverses the side wall of the pump casing and the proximal end of the arm, respectively. One end of the arm that extends into the inner cavity of the pump casing is connected to the cavity wall via a second spring. A roller that can contact the wall surface of the spindle is installed at the end of the arm. The bottom end of the spindle has a chamfered edge, and the periphery is a cylindrical peripheral wall. The insertion position of the intercepting head is located at a predetermined distance above the baffle ring, and the chamfered edge of the spindle begins to contact the roller after passing the intercepting head at least at the lowest point of the conical guide surface.

[0015] Furthermore, the top and bottom of the lever arm are provided with a sliding groove for the connection end of the arm and the intercepting head to move. This groove allows the connection end of the arm and the intercepting head to move adaptively relative to the sliding groove when the lever arm rotates around the pivot of the pivot seat to compensate for the change in distance between the arm and the pivot of the pivot seat, thereby converting the rotational motion of the lever arm into the opposite linear movement of the arm and the intercepting head.

[0016] The technical effects and advantages of this invention are as follows:

[0017] Through the coordinated operation of components such as the stopper rod, movable stopper, rotating shift sleeve, and positioning block, the mandrel and locking tongue are unlocked sequentially during the pumping gap. The capsule forming machine is then shifted and rotated from the feeding area to the spraying area, and the mandrel and locking tongue are re-locked. This allows for accurate and timely automatic application of release agent to the mold surface without the need for an additional independent coating system. This significantly reduces equipment and operating costs, avoids capsule breakage or deformation caused by untimely or inaccurate application of release agent, and ensures the volume stability of the liquid cavity and sufficient filling of the adhesive during the feeding stage. This improves the demolding quality and production efficiency of the capsule forming process. Furthermore, the structure is compact and the operation is reliable. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention in the material discharge stage.

[0019] Figure 2 For the present invention Figure 1 Three-dimensional schematic diagram of the pump casing, piston rod, rotary transposition sleeve and injection section.

[0020] Figure 3 For the present invention Figure 2 A schematic diagram of the structure of the pump casing, piston rod, movable piston, locking part, intercepting part and rotating transposition sleeve.

[0021] Figure 4 For the present invention Figure 3 A front view of the structure.

[0022] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point A in the middle.

[0023] Figure 6 This is a three-dimensional schematic diagram of the overall structure of the present invention in the material extraction stage.

[0024] Figure 7 For the present invention Figure 6 Three-dimensional schematic diagram of the pump casing, piston rod, rotary transposition sleeve and injection section.

[0025] Figure 8 For the present invention Figure 7 A schematic diagram of the structure of the pump casing, piston rod, movable piston, locking part, intercepting part and rotating transposition sleeve.

[0026] Figure 9 For the present invention Figure 8 A front view of the structure.

[0027] Figure 10 For the present invention Figure 9 Schematic diagram of the structure at point B.

[0028] Figure 11 This is a three-dimensional schematic diagram of the overall structure of the present invention in the transposition stage.

[0029] Figure 12 For the present invention Figure 11 Three-dimensional schematic diagram of the pump casing, piston rod, rotary transposition sleeve and injection section.

[0030] Figure 13 For the present invention Figure 12 A schematic diagram of the structure of the pump casing, piston rod, movable piston, locking part, intercepting part and rotating transposition sleeve.

[0031] Figure 14 For the present invention Figure 13 A front view of the structure.

[0032] Figure 15 For the present invention Figure 14 Schematic diagram of the structure at point C.

[0033] Figure 16 This is a front view of the pump housing, piston rod, movable piston, locking part, intercepting part, and rotating sleeve during the rotation stage of the present invention.

[0034] Figure 17 For the present invention Figure 16 Schematic diagram of the structure at point D.

[0035] The attached figures are labeled as follows: 1. Pump housing; 2. Plug rod; 21. Mandrel; 211. Slot; 22. Upper guide shaft; 23. Lower guide shaft; 24. Drive pin; 3. Movable plug; 31. Conical guide surface; 32. Through hole; 4. Locking part; 41. Locking tongue; 411. Clearance cavity; 42. First spring; 5. Intercepting part; 51. Lever arm; 52. Shaft seat; 53. Arm; 54. Roller; 55. Second spring; 56. Intercepting head; 6. Rotary repositioning sleeve; 61. Insertion cavity; 62. Spiral groove; 63. Guide pin; 7. Feed pipe; 8. Discharge pipe; 9. Injection section; 91. Fixed pipe; 92. Movable pipe; 93. Injection head; 10. Release agent spraying section; 11. Barrier ring; 12. Protrusion; 13. Guide groove; 14. Turntable; 15. Positioning block; 16. Base; 17. Gantry frame. Detailed Implementation

[0036] 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 pump body for a multi-mode quantitative output capsule forming machine involved in the present invention is 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.

[0037] Example 1, refer to Figures 1 to 17 As shown, this invention provides a pump body for a multi-mode quantitative output capsule forming machine, including a pump housing 1 and a plug rod 2 coaxially sleeved within it and capable of axial extension and retraction; the plug rod 2 includes a spindle 21, an upper guide shaft 22 and a lower guide shaft 23 respectively fixed to the top and bottom walls of the spindle 21 and extending axially, and a drive pin 24 extending radially from the bottom end of the lower guide shaft 23; a movable plug 3 is movably provided at the top of the spindle 21 and is always penetrated by the upper guide shaft 22, and a locking part 4 is provided inside the movable plug 3 that can extend and retract radially when subjected to external pressure, and the locking and unlocking of the spindle 21 and the movable plug 3 can be realized by the extension and retraction of the locking part 4; the pump housing 1 contains The wall is provided with a blocking ring 11 to intercept the movable plug 3, and a protrusion 12 fixed above the blocking ring 11 to trigger the unlocking action; the inner cavity of the pump housing 1 is also provided with a rotating shift sleeve 6 that is movably connected to the drive pin 24. When the mandrel 21 is locked with the movable plug 3 and moves down to extract material, the drive pin 24 drives the rotating shift sleeve 6 to move down as a whole to approach the center of the turntable on which the capsule forming machine is loaded; when the mandrel 21 is unlocked from the movable plug 3, the drive pin 24 drives the capsule forming machine to shift from the material conveying area to the spraying area and rotate back to reset during the descent and ascent, thereby realizing the automatic application of release agent to the capsule forming machine during the gap between the pump body's material extraction and discharge;

[0038] The bottom surface of the movable plug 3 has a groove for inserting the top end of the spindle 21. The periphery of the groove has a receiving groove that is radially connected to it. A locking part 4 is installed in the receiving groove. The locking part 4 includes a first spring 42 fixed deep in the receiving groove and a locking tongue 41 installed at the end of the first spring 42 and which can slide along the receiving groove under its elastic force. The end of the locking tongue 41 near the spindle 21 is a wedge-shaped head, which is inclined from top to bottom away from the spindle 21. The peripheral wall of the spindle 21 has a slot 211 that fits with the wedge-shaped head. The locking tongue 41 can be radially abutted against the slot 211 under the elastic force of the first spring 42 to achieve locking.

[0039] The bottom surface of the movable plug 3 has a through hole 32 located directly above the protrusion 12 and communicating with the receiving groove; the middle part of the locking tongue 41 has a relief cavity 411, which has a certain inner width along the extension direction of the receiving groove, and has an inclined surface on the side near the first spring 42 that matches the contact surface of the protrusion 12. The inclination direction of the inclined surface is consistent with that of the wedge head; when the first spring 42 is not compressed by external force, the bottom corner of the relief cavity 411 on the side near the first spring 42 is located above the through hole 32, so that after passing through the through hole 32, the protrusion 12 can be inserted into the relief cavity 411. The locking tongue 41, which is squeezed by it, slides away from the spindle 21 and compresses the first spring 42 to store force, so that the wedge head is withdrawn from the slot 211, realizing the unlocking action;

[0040] There is a liquid cavity between the movable plug 3 and the inner top wall of the pump housing 1. The volume of the liquid cavity changes as the movable plug 3 moves up and down. The top of the liquid cavity is equipped with a feed pipe 7 and a discharge pipe 8, both of which are equipped with a one-way valve. The feed pipe 7 is connected to a material supply source storing adhesive liquid, and the discharge pipe 8 is connected to an injection section 9 installed on the periphery of the pump housing 1. The discharge end of the injection section 9 can be aligned with the feed end of the capsule molding machine installed off-center from the turntable. A mold release agent spraying section 10 is provided above the extreme position of the capsule molding machine rotation and repositioning. Through the mold release agent spraying section 10, atomized mold release agent can be introduced into the unfilled cavity.

[0041] The rotary positioning sleeve 6 has an insertion cavity 61, and the inner peripheral wall of the insertion cavity 61 has a circumferentially coiled spiral groove 62. The end of the drive pin 24 is slidably embedded in the spiral groove 62. A guide pin 63 extends radially from the outer peripheral wall of the rotary positioning sleeve 6. A guide groove 13 is provided on the periphery of the pump housing 1 for the guide pin 63 to slide, so as to constrain its movement direction. When the mandrel 21 is locked and moved downward with the movable plug 3, the liquid cavity expands, and the drive pin 24 pushes the rotary positioning sleeve 6 downward toward the turntable. When the mandrel 21 is unlocked from the bottom of the movable plug 3 and continues to move downward, the liquid cavity is fixed, and the drive pin 24 drives the rotary positioning sleeve 6 and the turntable that is in contact with it to rotate together, so as to realize the displacement of the capsule forming machine.

[0042] The guide groove 13 is L-shaped and is composed of a longitudinal groove and a transverse groove. The length of the longitudinal groove is not less than the descent distance of the mandrel 21 when it is locked and moved with the movable plug 3. Since the guide pin 63 is restricted by the longitudinal groove of the guide groove 13, the downward thrust generated by the drive pin 24 sliding on the top of the spiral groove 62 cannot overcome the resistance constraint of the guide pin 63 in the circumferential direction, so that the plug rod 2 can push the rotary shift sleeve 6 to move axially and integrally downward through the drive pin 24. The length of the transverse groove is not less than the descent distance of the mandrel 21 after it is unlocked from the bottom of the movable plug 3. When the guide pin 63 has entered the transverse groove from the longitudinal groove of the guide groove 13, the guide pin 63 loses the resistance constraint in the circumferential direction, and the downward thrust generated by the drive pin 24 sliding in the spiral groove 62 will guide the rotary shift sleeve 6 to spin.

[0043] A drive device is fixed to the periphery of the pump housing 1 by a mounting bracket to control the lifting and lowering movement of the piston rod 2. This drive device can be selected as a telescopic cylinder; its telescopic shaft can control the piston rod 2 to move along the longitudinal direction of the pump housing 1, thereby providing driving force.

[0044] The pump housing 1 is connected to the turntable via a support base; wherein the support base includes a base 16 supported on the ground and a gantry frame 17 fixed to the base 16 and extending upward to the top of the pump housing 1; the turntable includes a turntable 14 rotatably disposed on the top wall of the base 16 and a positioning block 15 fixed to the center of the turntable 14; the rotary shifting sleeve 6 can contact the positioning block 15 after descending to the limit position, and the two are driven by static friction or a magnetic attraction structure, so that during rotational shifting, the rotary shifting sleeve 6 can drive the turntable 14 and the capsule forming machine mounted on it to shift together via the positioning block 15;

[0045] The pump body also includes a displacement monitoring system and a control system. The displacement monitoring system is set in the two working areas after the capsule forming machine changes position, namely the material conveying area and the spraying area. When the displacement monitoring system detects that the capsule forming machine has reached the spraying area, it can send a corresponding electrical signal to the control system. The control system outputs control over the release agent spraying section 10, so that it automatically introduces a certain amount of atomized release agent into the cavity, covering the empty cavity inner wall, in preparation for demolding after subsequent material feeding and molding.

[0046] The injection section 9 includes a fixed tube 91 fixed to the periphery of the pump housing 1 by a mounting bracket and connected to the discharge pipe 8, a movable tube 92 movably sleeved inside the fixed tube 91, an injection head 93 fixed to the bottom end of the movable tube 92, and a telescopic cylinder for controlling the extension amount of the movable tube 92 to adjust the position of the injection head 93 so that it can be aligned with and fit the inlet of the capsule forming machine; the release agent spraying section 10 adopts the same configuration as the injection section 9.

[0047] Example 2: During the pumping process, after the mandrel 21 is unlocked from the movable plug 3, how to prevent the movable plug 3 from retracting prematurely or excessively due to negative pressure, thus ensuring stable liquid chamber volume and sufficient glue filling, thereby guaranteeing the stability and reliability of the feeding stage; further optimization of the equipment structure is required, specifically: refer to... Figures 3 to 4 , Figures 8 to 10 ,as well as Figures 13 to 17 The pump housing 1 is also equipped with an intercepting part 5 located on the upper and lower sides of the longitudinally spanning the baffle ring 11. The intercepting part 5 includes a lever arm 51, which is hinged to a bearing seat 52 fixed outside the baffle ring 11. The top and bottom ends of the lever arm 51 are rotatably connected to the intercepting head 56 and the proximal end of the arm 53 that traverse the side wall of the pump housing 1, respectively. One end of the arm 53 that extends into the inner cavity of the pump housing 1 is connected to the cavity wall via a second spring 55. The end of the arm 53 is also equipped with a roller 54 that can contact the wall surface of the spindle 21. The bottom end of the spindle 21 has a chamfered edge, and the periphery is a cylindrical peripheral wall. Movable plug 3 The peripheral side of the mandrel 21 has a tapered guide surface 31 with a diameter decreasing from bottom to top. The insertion position of the intercepting head 56 is located at a predetermined distance above the blocking ring 11, and the chamfered edge of the mandrel 21 begins to contact the roller 54 after the lowest point of the tapered guide surface 31 passes the intercepting head 56, so as to avoid interference between the unlocking action of the locking part 4 and the intercepting action of the intercepting part 5. Note: The length of the cylindrical peripheral wall of the mandrel 21 is at least satisfied that during the descent of the mandrel 21 after it is unlocked from the bottom of the movable plug 3, its cylindrical peripheral wall always abuts against the roller 54 to maintain the predetermined state of interception above the movable plug 3.

[0048] The top and bottom of the lever arm 51 are provided with a sliding groove for the connecting end of the arm 53 and the intercepting head 56 to move. When the lever arm 51 rotates around the axis of the shaft seat 52, the connecting end of the arm 53 and the intercepting head 56 can move adaptively relative to the sliding groove, thereby compensating for the change in distance between the connecting end and the axis of the shaft seat 52, and converting the rotational motion of the lever arm 51 into the opposite linear movement of the arm 53 and the intercepting head 56.

[0049] Working principle of this invention:

[0050] S1. Feeding: The drive device controls the plunger 2 to extend along the longitudinal direction of the pump housing 1; at this time, the top of the spindle 21 is attached to the groove in the center of the movable plug 3, and the locking tongue 41 is radially abutted against the slot 211 under the elastic force of the first spring 42, so that the plunger 2 can pull the movable plug 3 locked with it to move axially downward through the spindle 21, thereby expanding the volume of the liquid chamber and forming a negative pressure. The glue from the material source can flow into the gradually expanding liquid chamber through the feed pipe 7 and its equipped one-way valve for feeding; at the same time, since the guide pin 63 is restricted by the longitudinal groove of the guide groove 13, the downward thrust generated by the drive pin 24 sliding on the top of the spiral groove 62 cannot overcome the resistance constraint of the guide pin 63 in the circumferential direction, so that the plunger 2 can push the rotating replacement sleeve 6 to move axially downward through the drive pin 24 and gradually approach the positioning block 15, so as to achieve extension by leveraging force for subsequent docking;

[0051] S2. Unlocking: As the rotating sleeve 6 moves from adjacent to fully fitting against the top wall of the positioning block 15, the movable plug 3 gradually approaches the blocking ring 11. During this process, the descending through hole 32 is penetrated by the protrusion 12 and enters the locking tongue 41 located in the receiving groove. The locking tongue 41 is squeezed by the protrusion 12 gradually inserted into the relief cavity 411, sliding away from the spindle 21 and compressing the first spring 42 to store force, causing the wedge-shaped head of the locking tongue 41 to gradually withdraw from the slot 211, thereby realizing the unlocking action between the spindle 21 and the locking tongue 41; in the middle and late stages of the unlocking action, that is, when the spindle 21 and the locking tongue 41 are not yet unlocked but are about to be unlocked, the spindle The chamfered edge at the bottom of the spindle 21 contacts the roller 54 and applies radial thrust, causing the arm 53 to move radially outward and compress the second spring 55 to store force. The arm 53 pushes the lever arm 51 to rotate around the pivot of the bearing 52, causing the intercepting head 56 to gradually extend into the liquid cavity and be placed horizontally near the conical guide surface 31. When the roller 54 passes the chamfered edge of the spindle 21 and enters its cylindrical peripheral wall, the intercepting head 56 maintains the predetermined interception state of the movable plug 3, preventing the movable plug 3 from retracting due to negative pressure when the spindle 21 and the locking tongue 41 have been unlocked and the liquid cavity has not been filled with sufficient adhesive, thereby ensuring the stability and reliability of the feeding stage.

[0052] S3, Repositioning: When the rotating repositioning sleeve 6 is fully engaged with the positioning block 15, the spindle 21 and the locking tongue 41 are unlocked. As the stopper rod 2 continues to move downward, the spindle 21 gradually disengages from the groove in the center of the movable plug 3, and the two are disconnected. The movable plug 3 can retract a short distance upward under the influence of negative pressure and then be intercepted by the intercepting head 56, thereby maintaining the required volume of the liquid cavity. At the same time, the guide pin 63 has entered the transverse groove from the longitudinal groove of the guide groove 13. At this time, the guide pin 63 loses the resistance constraint in the circumferential direction. The downward thrust generated by the drive pin 24 sliding in the spiral groove 62 will guide the rotating repositioning sleeve 6 to rotate, and then drive the positioning block 15 that is in contact with it to rotate as a whole, repositioning the capsule molding machine installed on the turntable 14, so that it rotates from directly below the injection section 9 to directly below the release agent spraying section 10. After the repositioning monitoring system detects this action, it automatically introduces atomized release agent into the cavity.

[0053] S4. Rotation: After the release agent spraying is completed, the drive device controls the stopper rod 2 to gradually lift up, and the mandrel 21 gradually approaches the groove in the center of the movable stopper 3; at the same time, the axially moving drive pin 24 guides the rotating displacement sleeve 6 to rotate in the opposite direction by the spiral groove 62 that slides with it, so that the guide pin 63 enters the inflection point of the longitudinal groove from the transverse groove of the guide groove 13, and drives the positioning block 15 that abuts with it to rotate in the opposite direction as a whole, so that the capsule molding machine that has completed the cavity spraying process rotates back from directly below the release agent spraying section 10 to directly below the injection section 9, ready for the delivery of adhesive liquid;

[0054] S5. Locking: When the top of the spindle 21 is about to be inserted into but has not yet inserted into the groove in the center of the movable plug 3, the roller 54 is located on the cylindrical peripheral wall of the spindle 21. As the spindle 21 gradually moves upward, the roller 54 moves along the cylindrical peripheral wall towards the chamfered edge at the bottom of the spindle 21. When the roller 54 enters the chamfered edge, the radial thrust gradually decreases, and the arm 53 moves radially inward under the release of the stored force of the second spring 55, causing the lever arm 51 to rotate in the opposite direction around the pivot of the bearing 52, so that the intercepting head 56 gradually exits from the liquid cavity and moves away from the cone. Guide surface 31, thereby releasing the obstruction of movable plug 3; until the mandrel 21 is fully inserted into the groove, the slot 211 pushes the movable plug 3 upward and moves as a whole to compress the liquid chamber. The glue in the liquid chamber is fed into the injection section 9 through the discharge pipe 8 and its equipped one-way valve, and then injected into the capsule forming machine through the injection section 9; when the clearance cavity 411 is completely removed from the interference of the protrusion 12, the locking tongue 41 is radially abutted against the slot 211 again under the elastic force of the first spring 42 to lock, in preparation for entering step S1 again;

[0055] Through the above cyclical steps, the release agent can be automatically and accurately applied to the mold surface using the pump material gap without significantly increasing equipment costs, thereby preventing the capsule from breaking or deforming during demolding.

[0056] 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 improved concept of the present invention, should be included under the protection of the present invention.

Claims

1. A multi-mode quantitative output pump body for capsule forming machines, comprising a pump housing (1) and a plunger (2) coaxially housed therein and axially movable in extension and retraction, characterized in that: The piston rod (2) includes a spindle (21), an upper guide shaft (22) and a lower guide shaft (23) that are fixed to the top and bottom walls of the spindle (21) and extend axially, and a drive pin (24) that extends radially from the bottom end of the lower guide shaft (23); the top of the spindle (21) is movably provided with a movable plug (3) that is always penetrated by the upper guide shaft (22), and the movable plug (3) is provided with a locking part (4) that can extend and retract radially when subjected to external pressure, so that the locking and unlocking of the spindle (21) and the movable plug (3) can be realized by the extension and retraction of the locking part (4); the inner wall of the pump housing (1) is provided with a blocking ring for intercepting the movable plug (3). (11) and a protrusion (12) fixed above the guard ring (11) for triggering unlocking; the pump housing (1) is provided with a rotating shift sleeve (6) that is movably connected to the drive pin (24). When the mandrel (21) and the movable plug (3) are locked and moved down to extract material, the drive pin (24) drives the rotating shift sleeve (6) to move down as a whole to approach the center of the turntable. When the mandrel (21) and the movable plug (3) are unlocked, the drive pin (24) drives the capsule forming machine to shift from the material conveying area to the spraying area and rotate back to reset during the upward movement after the downward movement, so as to achieve automatic application of release agent in the gap between the pump body extraction and discharge.

2. The pump body for a multi-mode quantitative output capsule forming machine according to claim 1, characterized in that: The bottom surface of the movable plug (3) is provided with a groove for inserting the top end of the spindle (21). The groove is surrounded by a receiving groove that is radially connected to it. The receiving groove is equipped with a locking part (4). The locking part (4) includes a first spring (42) fixed deep in the receiving groove and a locking tongue (41) installed at the end of the first spring (42) and slidable along the receiving groove. The end of the locking tongue (41) near the spindle (21) is a wedge-shaped head that is inclined from top to bottom away from the spindle (21). The peripheral wall of the spindle (21) is provided with a slot (211) that fits with the wedge-shaped head. The locking tongue (41) is radially abutted against the slot (211) under the elastic force of the first spring (42) to achieve locking.

3. The pump body for a multi-mode quantitative output capsule forming machine according to claim 2, characterized in that: The bottom surface of the movable plug (3) is provided with a through hole (32) located directly above the protrusion (12) and communicating with the receiving groove; the middle part of the locking tongue (41) is provided with a relief cavity (411), the relief cavity (411) has a certain inner width along the extension direction of the receiving groove, and the side near the first spring (42) has an inclined surface that matches the contact surface of the protrusion (12), the inclination direction of the inclined surface is consistent with the wedge head; when the first spring (42) is not compressed by external force, the bottom corner of the relief cavity (411) near the first spring (42) is located above the through hole (32), so that the protrusion (12) passes through the through hole (32) and is inserted into the relief cavity (411), the squeezed locking tongue (41) slides away from the spindle (21) and compresses the first spring (42) to store force, so that the wedge head is withdrawn from the slot (211) to achieve unlocking.

4. The pump body for a capsule forming machine with multi-mode quantitative output according to claim 1 or 3, characterized in that: There is a liquid cavity between the movable plug (3) and the inner wall of the pump housing (1) with a volume that changes with the rise and fall of the movable plug (3). The top of the liquid cavity is equipped with a feed pipe (7) and a discharge pipe (8). Both the feed pipe (7) and the discharge pipe (8) are equipped with a one-way valve. The feed pipe (7) is connected to the supply source of the stored adhesive liquid. The discharge pipe (8) is connected to the injection part (9) installed on the periphery of the pump housing (1). The discharge end of the injection part (9) can be aligned with the feed end of the capsule molding machine installed off the center of the turntable. A release agent spraying part (10) is provided above the extreme position of the capsule molding machine rotation and repositioning. Through the release agent spraying part (10), the atomized release agent can be introduced into the cavity that has not been fed.

5. The pump body for a capsule forming machine with multi-mode quantitative output according to claim 4, characterized in that: The rotating sleeve (6) has an insertion cavity (61) inside, and the inner circumferential wall of the insertion cavity (61) has a circumferentially coiled spiral groove (62). The end of the drive pin (24) is slidably embedded in the spiral groove (62). The outer circumferential wall of the rotating sleeve (6) has a guide pin (63) extending radially. The circumferential side of the pump housing (1) has a guide groove (13) for the guide pin (63) to slide to constrain its movement direction. When the mandrel (21) locks with the movable plug (3) and moves downward, the liquid cavity expands, and the drive pin (24) pushes the rotating sleeve (6) downward toward the turntable. When the mandrel (21) is unlocked from the bottom of the movable plug (3) and continues to move downward, the liquid cavity is fixed, and the drive pin (24) drives the rotating sleeve (6) and the turntable that is attached to it to rotate together, realizing the displacement of the capsule forming machine.

6. The pump body for a capsule forming machine with multi-mode quantitative output according to claim 5, characterized in that: The guide groove (13) is L-shaped, consisting of a longitudinal groove and a transverse groove. The length of the longitudinal groove is not less than the descent distance when the spindle (21) and the movable plug (3) are locked together and moved. The length of the transverse groove is not less than the descent distance after the spindle (21) is unlocked from the bottom of the movable plug (3).

7. The pump body for a multi-mode quantitative output capsule forming machine according to claim 1, characterized in that: The pump housing (1) is connected to the turntable via a support base, which includes a base (16) supported on the ground and a gantry (17) fixed to the base (16) and extending upward to the top of the pump housing (1). The turntable includes a turntable (14) rotatably mounted on the top wall of the base (16) and a positioning block (15) fixed to the center of the turntable (14). After the rotating sleeve (6) descends to its limit position, it contacts the positioning block (15). The two are driven by static friction or a magnetic attraction structure, so that when rotating, the rotating sleeve (6) can drive the turntable (14) and the capsule forming machine mounted above it to change position together via the positioning block (15).

8. The pump body for a capsule forming machine with multi-mode quantitative output according to claim 1, characterized in that: It also includes a displacement monitoring system and a control system. The displacement monitoring system is set in the material conveying area and the spraying area after the capsule molding machine is displaced. When the capsule molding machine is detected to have reached the spraying area, it sends an electrical signal to the control system. The control system controls the release agent spraying part (10) to automatically introduce a certain amount of atomized release agent into the cavity.

9. The pump body for a capsule forming machine with multi-mode quantitative output according to claim 1, characterized in that: The pump housing (1) is equipped with an interception part (5) located on the upper and lower sides of the longitudinally spanning the baffle ring (11). The interception part (5) includes a lever arm (51) hinged to the shaft seat (52). The top and bottom ends of the lever arm (51) are rotatably connected to the interception head (56) and the proximal end of the arm (53) that traverse the side wall of the pump housing (1). One end of the arm (53) that extends into the inner cavity of the pump housing (1) is connected to the cavity wall via a second spring (55). The end of the arm (53) is equipped with a roller (54) that can contact the wall surface of the spindle (21). The bottom end of the spindle (21) has a chamfered edge, and the periphery is a cylindrical periphery wall. The insertion position of the interception head (56) is located at a predetermined distance above the baffle ring (11), and the chamfered edge of the spindle (21) begins to contact the roller (54) after the lowest point of the conical guide surface (31) passes the interception head (56).

10. The pump body for a capsule forming machine with multi-mode quantitative output according to claim 9, characterized in that: The top and bottom of the lever arm (51) are provided with a sliding groove for the connecting end of the arm (53) and the intercepting head (56) to move. When the lever arm (51) rotates around the pivot of the bearing seat (52), the connecting end of the arm (53) and the intercepting head (56) moves adaptively relative to the sliding groove to compensate for the change in distance between the arm (53) and the pivot of the bearing seat (52), thereby converting the rotational motion of the lever arm (51) into the opposite linear movement of the arm (53) and the intercepting head (56).

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