Disassembly-free melt pump easy to clean

Abstract

The melt pump comprises a pump body, an upper gear cavity and a lower gear cavity are formed in the middle of the pump body, a first gear is arranged in each gear cavity, a cleaning assembly is arranged on the rear side wall of the pump body, a positioning assembly is arranged on the front side wall of the pump body, and the cleaning assembly comprises a first shell with an opening in the right end; an upper first through hole and a lower first through hole are formed in the front end face of the first shell, a front first sliding block and a rear first sliding block are arranged in the first shell, a rotating shaft is arranged between the two first sliding blocks, the rotating shaft can horizontally move left and right and can rotate around the axis at the same time, and when the two first sliding blocks move forwards, the rotating shaft can be arranged in the feeding port; the rotating shaft moves rightwards to the rightmost end and can make contact with a gear groove of the first gear. The first through hole and the second through hole which can be blocked and opened at any time are formed in the front side wall and the rear side wall of the pump body, so that the brush roller can enter the gear cavity through the first through hole, the melt pump is prevented from being integrally disassembled and cleaned, returning cleaning is not needed, and manpower and material resources are greatly saved.

Description

Technical Field

[0001] The invention relates to the field of melt pump production, in particular to a disassembly-free and easy-to-clean melt pump. Background Art

[0002] Melt pumps are widely used in industries such as granulation, film, pipe, plate, and plastic conduit. Most of the melt pumps currently used have complex structures, and plastic melt is easily left in the dead corners of the melt cavity and the discharge channel. Therefore, it is necessary to regularly stop the machine to clean the residual material in the dead corners of the melt cavity, and even disassemble the melt pump for cleaning. The traditional gear pump sleeve adopts a symmetrical semicircular structure, which has complicated procedures in production and processing. There are many points that need to be matched during subsequent precision grinding. Repeated disassembly and cleaning can easily reduce the matching accuracy of the melt pump, increase the possibility of cumulative errors, affect the service life and extrusion accuracy of the melt pump, and waste a lot of manpower and material resources; Announcement No. CN207724792U discloses a melt pump for processing plastic barrels. By arranging a rotating rod and a brush inside the melt pump, the residual plastic melt in the dead corner of the gear groove in the melt cavity is effectively solved. By arranging a spiral track and a scraper in the discharge channel, the plastic melt is avoided from remaining in the discharge channel, and there is no need to stop the machine regularly to clean the dead corner of the melt cavity and the residual material in the discharge channel; however, this solution still has the following problems: 1. Arranging a cleaning component inside the pump body increases the material pumping resistance to a certain extent, hinders the material feeding, and affects the extrusion quality; 2. The brush cleaning position is fixed, and it is difficult to effectively clean the gear groove; 3. The cleaning component is easily stuck when placed in the cavity for a long time, and it is difficult to replace, and the practicality is low. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention adopts a disassembly-free and easy-to-clean melt pump, which solves the problem of the melt pump gear groove being difficult to clean in the prior art.

[0004] The technical solution is a disassembly-free and easy-to-clean melt pump, including a pump body, with two upper and lower cylindrical gear cavities interconnected in the middle of the pump body, each gear cavity is coaxially connected to a gear shaft, a first gear is fixed to each gear shaft, the two first gears are meshed with each other, and the front and rear end faces and the outer edge face of each first gear are clearance-matched with the inner wall of the gear cavity, and a feed port and a discharge port connected to the gear cavity are respectively provided at the left and right ends of the pump body; a cleaning component is provided at the feed port position on the rear side wall of the pump body, a positioning component is provided at the front side wall of the pump body corresponding to the cleaning component, and the cleaning component includes a first gear opening at the right end A shell, the front end surface of the first shell is provided with two upper and lower first through holes that penetrate into the gear cavity, the first shell is provided with two front and rear first sliding blocks, the left ends of the two first sliding blocks are fixedly connected by a connecting rod, the front first sliding block is placed in the first through hole and is gap-matched with the first through hole, a rotating shaft with an axis horizontally placed front and back is provided between the two first sliding blocks, the rotating shaft can translate left and right and rotate around the axis at the same time, the rotating shaft is always subjected to a rightward thrust, a brush roller is fixed on the rotating shaft, when the two first sliding blocks move forward, the rotating shaft can be placed in the feed port, when the rotating shaft is placed in the feed port, the rotating shaft moves to the right to the rightmost end to contact the gear groove of the first gear.

[0005] A second shell is fixed on the front end face of the pump body, and two upper and lower second through holes that pass through the front end face of the pump body are provided at the front end of the second shell, the second through hole coincides with the projection of the first through hole on the front and rear end faces, a blocking block is provided in the second through hole, the blocking block is clearance-matched with the second through hole and can slide back and forth along the second through hole, a compression spring is provided between the blocking block and the front end face of the second shell cavity, the compression spring always makes the rear end face of the blocking block flush with the front end face of the feed port; a first air outlet connected with the cavity is provided on the front end face of the second shell, a blind hole is provided on the left end face of the second shell located in the middle of the first air outlet, the middle part of the blind hole is connected with the middle part of the first air outlet, a gear lever that can slide left and right is provided in the blind hole, a second air outlet that passes through the front and rear end faces is provided in the middle part of the gear lever, the gear lever always blocks the first air outlet when not subject to external force, and when the gear lever slides to the outside of the blind hole, the second air outlet can be connected with the first air outlet.

[0006] The inner edge surfaces of the first through hole and the second through hole are both provided with annular grooves, and an annular airbag is arranged in each annular groove. When the annular airbag is expanded, it can seal the gap between the first through hole, the second through hole and the first slider. A spherical airbag is arranged at the bottom of the blind hole, and each annular airbag is connected with a ventilation pipe. Each ventilation pipe passes through the outer wall of the pump body and is connected with the spherical airbag at the bottom of the blind hole. A compression spring is connected between the outer end of the gear lever and the inner wall of the blind hole, and the compression spring always pushes the gear lever to the right.

[0007] The outer end of the lever is rotatably connected with a pull rod, which extends out of a blind hole and is fixed with a pull ring. A boss is fixed on the outer edge of the pull rod, and a clearance groove is provided on the inner wall of the blind hole. The boss can only slide left and right through the clearance groove to extend out of the blind hole.

[0008] The two first sliders are located on the left side of the first gear and do not interfere with the first gear when moving back and forth at the feed port. Adjacent end faces of the two first sliders are respectively provided with transverse slide grooves, and each slide groove has a second slider that can slide left and right along the slide groove. The second slider is a rectangular block and the upper and lower end faces slide in contact with the upper and lower end faces of the slide groove. An adjacent end of each second slider extends out of the slide groove and is fixed with a support plate. The front and rear ends of the rotating shaft are respectively rotatably connected to the support plates on the front and rear sides. The rotating shaft as a whole is located on the right side of the second slider. When the second slider moves to the right to the rightmost end of the slide groove, the brush roller can be located on the right side of the first slider.

[0009] A compression spring is arranged between the second sliding block and the left end surface of the sliding slot.

[0010] The left side of the second slider is rotatably connected to a rotating rod, a second gear is fixed to the middle of the rotating rod, the second gear is located on the inner side of the slide groove, a rack is fixed to the lower end surface of the slide groove, the rack is meshed with the second gear, one end of the rotating rod passes through the support plate and is fixed with a third gear, fourth gears are fixed to the front and rear ends of the rotating shaft respectively, and the third gear is meshed with the fourth gear.

[0011] The rear side of the first shell is provided with a U-shaped rod with an opening facing forward, and two cross bars of the U-shaped rod both penetrate the rear end surface of the first shell and are fixedly connected to the upper and lower first sliding blocks on the rear side respectively.

[0012] The distance between the two first sliding blocks is equal to the distance between the first through hole and the second through hole.

[0013] The outer edge surface of the first sliding block is provided with a rubber sealing layer.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The present invention provides a first through hole and a second through hole on the front and rear side walls of the pump body that can be blocked and opened at any time, so that the brush roller can enter the gear cavity through the first through hole, avoiding the disassembly and cleaning of the melt pump as a whole, effectively preventing the reduction of the parts matching accuracy during the disassembly and reassembly process, and eliminating the need to return to the site for cleaning, thereby greatly saving manpower and material resources; 2. The external cleaning component can also facilitate the disassembly and replacement of the cleaning component, and facilitate the reuse of the cleaning component; 3. When the extrusion operation of the present invention is working normally, the first slider and the blocking block on the front side are used to block the front and rear first through holes, and the annular airbag is used to further seal them to ensure that the material will not leak through the first through holes under the action of positive pressure; 4. The boss on the rotating rod cooperates with the clearance groove to limit the gear lever, so that the operator can more easily control the inflation and deflation of the annular airbag, ensure the sealing of the first through hole and control the movement and limitation of the block, so that the first slider on the front side can squeeze the block forward to make way after moving to the second through hole position, and limit the movement of the block when the brush roller cleans the first gear, ensuring the cleaning effect; 5. The present invention drives the rotating rod to rotate through the meshing of the second gear and the rack, and the rotating rod drives the rotating shaft to rotate synchronously through the meshing of the third gear and the fourth gear, so that the contact surface between the roller brush and the first gear always produces relative motion, greatly improving the cleaning efficiency of the roller brush on the tooth groove of the first gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the present invention.

[0016] Figure 2 It is a front cross-sectional view of the present invention.

[0017] Figure 3 It is a top cross-sectional view of the present invention.

[0018] Figure 4 for Figure 3 A is an enlarged view of the middle image.

[0019] Figure 5 for Figure 3 Enlarged view of B.

[0020] Figure 6 This is a top view of the cross-section when the first gear is removed during use of the present invention.

[0021] Figure 7 It is a three-dimensional diagram of the second sliding block and the supporting plate of the present invention.

[0022] Figure 8 It is a stereoscopic view of the pull rod, rotating rod and pull ring of the present invention. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0024] Depend on Figures 1 to 8The present invention comprises a pump body 1, wherein two cylindrical gear cavities 2 interconnected with each other are provided in the middle of the pump body 1, each gear cavity 2 is coaxially connected with a gear shaft 3, each gear shaft 3 is fixed with a first gear 4, the two first gears 4 are meshed with each other, and the front and rear end faces and the outer edge face of each first gear 4 are gap-matched with the inner wall of the gear cavity 2, and the left and right ends of the pump body 1 are respectively provided with a feed port 5 and a discharge port 6 connected with the gear cavity 2; the rear side wall of the pump body 1 is provided with a cleaning component at the position of the feed port 5, and the front side wall of the pump body 1 is provided with a positioning component at a position corresponding to the cleaning component, and the cleaning component comprises a first shell 7 with an opening at the right end, and the front end face of the first shell 7 is provided with a There are two upper and lower first through holes 8 that penetrate the gear cavity 2, and two front and rear first sliding blocks 9 are arranged in the first shell 7. The left ends of the two first sliding blocks 9 are fixedly connected by a connecting rod. The front first sliding block 9 is placed in the first through hole 8 and is clearance-matched with the first through hole 8. A rotating shaft 10 with an axis horizontally placed front and back is arranged between the two first sliding blocks 9. The rotating shaft 10 can translate left and right and rotate around the axis at the same time. The rotating shaft 10 is always subjected to a rightward thrust. A brush roller 11 is fixed on the rotating shaft 10. When the two first sliding blocks 9 move forward, the rotating shaft 10 can be placed in the feed port 5. When the rotating shaft 10 is placed in the feed port 5, the rotating shaft 10 moves to the right to the rightmost end to contact the gear groove of the first gear 4.

[0025] The front end face of the pump body 1 is fixed with a second shell 12, and the front end of the second shell 12 is provided with two second through holes 13, which penetrate the front end face of the pump body 1. The second through hole 13 coincides with the projection of the first through hole 8 on the front and rear end faces. A block 14 is arranged in the second through hole 13, and the block 14 is fitted with the second through hole 13 and can slide forward and backward along the second through hole 13. A compression spring is arranged between the block 14 and the front end face of the second shell 12 cavity, and the compression spring always makes the rear end face of the block 14 flush with the front end face of the feed port 5; the front end face of the second shell 12 A first air outlet 15 connected to the cavity is provided on the end surface, and a blind hole 16 is provided on the left end surface of the second shell 12 at the middle position of the first air outlet 15. The middle part of the blind hole 16 is connected to the middle part of the first air outlet 15. A gear lever 17 that can slide left and right is provided in the blind hole 16. A second air outlet 18 that runs through the front and rear end surfaces is provided in the middle part of the gear lever 17. The gear lever 17 always blocks the first air outlet 15 in the absence of external force. When the gear lever 17 slides to the outside of the blind hole 16, the second air outlet 18 can be connected to the first air outlet 15.

[0026] The inner edge surfaces of the first through hole 8 and the second through hole 13 are both provided with an annular groove 19, and an annular airbag 20 is arranged in each annular groove 19. When the annular airbag 20 expands, it can seal the gap between the first through hole 8, the second through hole 13 and the first slider 9. A spherical airbag 21 is arranged at the bottom of the blind hole 16, and each annular airbag 20 is connected with a ventilation pipe 35. Each ventilation pipe 35 penetrates the outer wall of the pump body 1 and is connected with the spherical airbag 21 at the bottom of the blind hole 16. A compression spring is connected between the outer end of the shift lever 17 and the inner wall of the blind hole 16. The compression spring always pushes the shift lever 17 to the right. Under the thrust of the compression spring, the shift lever 17 always keeps the spherical airbag 21 in a compressed state and the annular airbag 20 in an expanded state.

[0027] The outer end of the shift lever 17 is rotatably connected to a pull rod 22, the outer end of the pull rod 22 extends out of the blind hole 16 and is fixed with a pull ring 23, a boss 24 is fixed to the outer edge of the pull rod 22, and a clearance groove 25 is opened on the inner wall of the blind hole 16. The boss 24 can only slide left and right through the clearance groove 25 to extend out of the blind hole 16.

[0028] The two first sliders 9 are located on the left side of the first gear 4 and do not interfere with the first gear 4 when the feed port 5 moves back and forth. A transverse slide groove 26 is respectively provided on the adjacent end faces of the two first sliders 9. A second slider 27 that can slide left and right along the slide groove 26 is respectively arranged in each slide groove 26. The second slider 27 is a rectangular block and the upper and lower end faces slide in contact with the upper and lower end faces of the slide groove 26. An adjacent end of each second slider 27 extends out of the slide groove 26 and is fixed with a support plate 28. The front and rear ends of the rotating shaft 10 are respectively rotatably connected to the support plates 28 on the front and rear sides. The rotating shaft 10 is located on the right side of the second slider 27 as a whole. When the second slider 27 moves rightward to the rightmost end of the slide groove 26, the brush roller 11 can be located on the right side of the first slider 9.

[0029] A compression spring is arranged between the second slider 27 and the left end surface of the slide slot 26, and the compression spring always gives the second slider 27 a rightward thrust.

[0030] The second slider 27 is rotatably connected to a rotating rod 29 on the left side, and a second gear 30 is fixed to the middle of the rotating rod 29. The second gear 30 is located on the inner side of the slide groove 26. A rack 31 is fixed to the lower end surface of the slide groove 26, and the rack 31 is meshed with the second gear 30. One end of the rotating rod 29 passes through the support plate 28 and is fixed with a third gear 32. Fourth gears 33 are fixed to the front and rear ends of the rotating shaft 10 respectively, and the third gear 32 is meshed with the fourth gear 33. When the second slider 27 moves left and right in the slide groove 26, the rotating shaft 10 can rotate synchronously with the rotating rod 29.

[0031] The rear side of the first shell 7 is provided with a U-shaped rod 34 with an opening facing forward, and two cross bars of the U-shaped rod 34 both penetrate the rear end surface of the first shell 7 and are fixedly connected to the upper and lower first sliding blocks 9 on the rear side respectively.

[0032] The distance between the two first sliding blocks 9 is equal to the distance between the first through hole 8 and the second through hole 13 .

[0033] The outer edge surface of the first sliding block 9 is provided with a rubber sealing layer, which can seal the gap between the first sliding block 9 and the first through hole 8 and the second through hole 13 .

[0034] It is worth mentioning that in order to ensure that the rack 31 does not interfere with the lower end surface of the second slider 27, the contact surface height between the lower end surface of the second slider 27 and the slide groove 26 is higher than the tooth top height of the rack 31, or the rack 31 is placed in the sink groove so that the lower end of the second gear 30 is lower than the lower end surface of the second slider 27.

[0035] When the present invention is in use, firstly, the rotating shaft 10 is located in the first housing 7, the front first slider 9 blocks the rear first through hole 8, the blocking block 14 blocks the second through hole 13 under the action of the compression spring, and then the protrusion 24 on the gear lever 17 is placed in the yielding groove 25, and the gear lever 17 squeezes the spherical airbag 21 under the action of the left compression spring, so that all the annular airbags 20 are in an expanded state, and the first through hole 8 and the second through hole 13 are sealed, and then the gear shaft 3 is connected to the motor shaft, and the motor drives the upper first gear 4 to rotate clockwise, and the extruder material enters the gear cavity 2 through the feed port 5, and the material continuously enters the right discharge pipe 6 and is extruded outward through the expansion and compression of the tooth spacing of the upper and lower first gears 4; After long-term use, material impurities are likely to remain in the gear groove. At this time, the melt pump only needs to be stopped, and then the operator pulls out the gear lever 17 through the pull ring 23 to move the boss 24 out of the clearance groove 25, releases the pressure of the gear lever 17 on the spherical airbag 21, and at the same time connects the second air outlet 18 with the first air outlet 15, and then rotates the pull rod 22 to make the boss 24 deviate from the clearance groove 25 and release the pull ring 23. At this time, the boss 24 can be blocked by the left end face of the second shell 12 and cannot move to the inside of the blind hole 16, and then is pushed forward by the U-shaped rod 34. The first slider 9 is moved, and the brush roller 11 is pressed to the left side into the cavity of the first shell 7. The two first sliders 9 move forward synchronously under the fixing action of the connecting rod until the front first slider 9 overcomes the elastic force of the compression spring on the front side of the block 14 and is placed in the second through hole 13. The pull rod 22 is rotated again to reset, so that the boss 24 overlaps with the give way groove 25 again. The blocking rod 17 can be reset under the action of the compression spring to re-close the first vent 15, and the cavity of the second shell 12 is sealed. The position of the block 14 is fixed. At this time, the upper and lower rotating shafts 10 are just located on the inner side of the feed port 5, and the second Under the action of the compression spring on the left side of the slider 27, the brush roller 11 can move rightward into the gear cavity 2 and contact the outer edge surfaces of the upper and lower first gears 4 respectively; then the motor is started to make the first gear 4 continue to rotate. During the rotation of the first gear 4, the height difference between the outer teeth and the tooth grooves can cooperate with the compression spring on the left side of the second slider 27 to push the roller brush 11 to move back and forth left and right. During the left and right movement of the second slider 27, the engagement of the second gear 30 with the rack 31 can drive the rotating rod 29 to rotate. The rotating rod 29 is engaged by the third gear 32 and the fourth gear 33. The combination drives the rotating shaft 10 to rotate synchronously, so that the contact surface of the roller brush 11 and the first gear 4 always produces relative movement, which greatly improves the cleaning efficiency of the roller brush 11 on the tooth groove of the first gear 4; after repeated cleaning in this way, the residual material in the gear groove is cleaned up, it is only necessary to pull out the gear lever 17 again through the pull ring 23 and rotate the rotating rod 22 to limit the boss 24, and then pull out the two first sliders 9 through the U-shaped rod 34. Since the right end of the first shell 7 is open, the brush roller 11 on the outside can be replaced after the rotating shaft 10 is pulled out, which is convenient for subsequent reuse.

[0036] The present invention provides a first through hole 8 and a second through hole 13 on the front and rear side walls of the pump body 1, which can be blocked and opened at any time, so that when the tooth groove of the first gear 4 needs to be cleaned of impurities, the brush roller 11 can enter the gear cavity 2 through the first through hole 8, thereby avoiding the need to disassemble and clean the melt pump as a whole, and effectively preventing the reduction of the matching accuracy of parts during disassembly and reassembly; the external cleaning component can also facilitate the disassembly and replacement of the cleaning component, and facilitate the reuse of the cleaning component; when the extrusion operation is working normally, the present invention blocks the front and rear first through holes 8 through the first slider 9 and the block 14 on the front side, and further seals them with the annular airbag 20 to ensure that the material will not leak through the first through hole 8 under the action of positive pressure; through the boss on the rotating rod 22 24 cooperates with the make way groove 25 to limit the gear lever 17, so that the operator can more easily control the inflation and deflation of the annular airbag 20, ensure the sealing of the first through hole 8 while controlling the movement and limitation of the block 14, so that the front first slider 9 can squeeze the block 14 forward to make way after moving to the position of the second through hole 13, and can limit the movement of the block 14 during the cleaning process of the brush roller 11 on the first gear 4, thereby ensuring the cleaning effect; the present invention drives the rotating rod 29 to rotate through the engagement of the second gear 30 and the rack 31, and the rotating rod 29 is driven by the engagement of the third gear 32 and the fourth gear 33 to drive the rotating shaft 10 to rotate synchronously, so that the contact surface of the roller brush 11 and the first gear 4 always produces relative movement, thereby greatly improving the cleaning efficiency of the roller brush 11 on the tooth groove of the first gear 4.

Claims

1. A disassembly-free and easy-to-clean melt pump, comprising a pump body (1), wherein the middle of the pump body (1) is provided with two cylindrical gear cavities (2) which are connected to each other from top to bottom, wherein each gear cavity (2) is coaxially rotatably connected with a gear shaft (3), and each gear shaft (3) is fixed with a first gear (4), wherein the two first gears (4) are meshed with each other, and the front and rear end faces and the outer edge face of each first gear (4) are clearance-matched with the inner wall of the gear cavity (2), and the left and right ends of the pump body (1) are respectively provided with a feed port (5) and a discharge port (6) which are connected with the gear cavity (2), and characterized in that: The rear side wall of the pump body (1) is provided with a cleaning component at the position of the feed inlet (5), and the front side wall of the pump body (1) is provided with a positioning component at a position corresponding to the cleaning component. The cleaning component comprises a first shell (7) with an opening at the right end, and the front end surface of the first shell (7) is provided with two upper and lower first through holes (8) penetrating into the gear cavity (2). The first shell (7) is provided with two front and rear first sliders (9), and the left ends of the two first sliders (9) are fixedly connected by a connecting rod. The front first slider (9) is placed in the first through hole (8) and is connected to the first through hole (8). The holes (8) are clearance-matched, and a rotating shaft (10) is arranged between the two first sliders (9) with its axis horizontally placed forward and backward. The rotating shaft (10) can translate left and right and can rotate around the axis at the same time. The rotating shaft (10) is always subjected to a rightward thrust. A brush roller (11) is fixed on the rotating shaft (10). When the two first sliders (9) move forward, the rotating shaft (10) can be placed in the feed port (5). When the rotating shaft (10) is placed in the feed port (5), the rotating shaft (10) moves rightward to the rightmost end and can contact the gear groove of the first gear (4).

2. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: The front end surface of the pump body (1) is fixed with a second shell (12), and the front end of the second shell (12) is provided with two second through holes (13) extending through the front end surface of the pump body (1), the second through hole (13) and the projection of the first through hole (8) on the front and rear end surfaces coincide with each other, a blocking block (14) is arranged in the second through hole (13), the blocking block (14) and the second through hole (13) are clearance-matched and can slide forward and backward along the second through hole (13), a compression spring is arranged between the blocking block (14) and the front end surface of the cavity of the second shell (12), and the compression spring always makes the rear end surface of the blocking block (14) flush with the front end surface of the feed port (5); the second shell (12) A first air outlet (15) communicating with the cavity is provided on the front end surface; a blind hole (16) is provided on the left end surface of the second shell (12) at a position in the middle of the first air outlet (15); the middle of the blind hole (16) is communicated with the middle of the first air outlet (15); a shift rod (17) capable of sliding left and right is provided in the blind hole (16); a second air outlet (18) penetrating the front and rear end surfaces is provided in the middle of the shift rod (17); the shift rod (17) always blocks the first air outlet (15) in the absence of external force; when the shift rod (17) slides toward the outside of the blind hole (16), the second air outlet (18) can be communicated with the first air outlet (15).

3. The disassembly-free and easy-to-clean melt pump according to claim 2, characterized in that: The inner edge surfaces of the first through hole (8) and the second through hole (13) are both provided with an annular groove (19), and an annular airbag (20) is provided in each annular groove (19). When the annular airbag (20) is expanded, it can seal the gap between the first through hole (8), the second through hole (13) and the first slider (9). A spherical airbag (21) is provided at the bottom of the blind hole (16). Each annular airbag (20) is connected to a vent pipe (35). Each vent pipe (35) passes through the outer wall of the pump body (1) and is connected to the spherical airbag (21) at the bottom of the blind hole (16). A compression spring is connected between the outer end of the shift lever (17) and the inner wall of the blind hole (16).

4. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: The outer end of the shift rod (17) is rotatably connected to a pull rod (22), the outer end of the pull rod (2) extends out of the blind hole (16) and is fixed with a pull ring (23), a boss (24) is fixed to the outer edge of the pull rod (22), a clearance groove (25) is formed on the inner wall of the blind hole (16), and the boss (24) can only slide left and right through the clearance groove (25) to extend out of the blind hole (16).

5. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: The two first sliders (9) are located on the left side of the first gear (4) and do not interfere with the first gear (4) when the feed port (5) moves forward and backward. The adjacent end surfaces of the two first sliders (9) are respectively provided with a transverse slide groove (26). Each slide groove (26) has a second slider (27) that can slide left and right along the slide groove (26). The second slider (27) is a rectangular block and the upper and lower end surfaces are slidably fitted with the upper and lower end surfaces of the slide groove (26). The adjacent end of each second slider (27) extends out of the slide groove (26) and is fixed with a support plate (28). The front and rear ends of the rotating shaft (10) are respectively rotatably connected to the support plates (28) on the front and rear sides. The rotating shaft (10) is located on the right side of the second slider (27). When the second slider (27) moves rightward to the rightmost end of the slide groove (26), the brush roller (11) can be located on the right side of the first slider (9).

6. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: A compression spring is provided between the second sliding block (27) and the left end surface of the sliding groove (26).

7. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: The left side of the second sliding block (27) is rotatably connected to a rotating rod (29), a second gear (30) is fixed to the middle of the rotating rod (29), the second gear (30) is located inside the slide groove (26), a rack (31) is fixed to the lower end surface of the slide groove (26), the rack (31) is meshed with the second gear (30), one end of the rotating rod (29) passes through the support plate (28) and is fixed with a third gear (32), and fourth gears (33) are respectively fixed to the front and rear ends of the rotating shaft (10), and the third gear (32) is meshed with the fourth gear (33).

8. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: The rear side of the first shell (7) is provided with a U-shaped rod (34) with an opening facing forward, and two cross bars of the U-shaped rod (34) both penetrate the rear end surface of the first shell (7) and are respectively fixedly connected to the upper and lower first sliding blocks (9) on the rear side.

9. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: The distance between the two first sliding blocks (9) is equal to the distance between the first through hole (8) and the second through hole (13).

10. The disassembly-free and easy-to-clean melt pump according to claim 1, characterized in that: The outer edge surface of the first sliding block (9) is provided with a rubber sealing layer.

Images