EVA underwater pelletizing machine with easy replacement of blades

Abstract

The invention relates to an EVA underwater granulator for convenient replacement of a cutter head, and relates to the technical field of cutting equipment, comprising a granulation orifice plate, a water flow conveying system, a cutting advance and retreat system, a cutting rotary system and a plurality of tool replacement systems, wherein the cutting advance and retreat system drives the cutting rotary system to extend into a cutting chamber, and each tool replacement system is installed on the cutting rotary system, and each tool replacement system comprises a tool mounting block, a plurality of replacement knives, a plurality of replacement support rods, a plurality of sensing devices and a plurality of retraction devices, each replacement knife is slidably mounted in a corresponding tool sliding groove, each replacement support rod supports the corresponding replacement knife, each sensing device is transmission-connected to the replacement support rod, the tool mounting block is provided with a cutting pre-compression spring and is slidably mounted on a rotary end, each replacement knife and the sensing device are slidingly matched with the granulation orifice plate, each retraction device is transmission-connected to the replacement knife, and the action direction of the retraction device causes the replacement knife to move in a direction away from the granulation orifice plate, thereby realizing automatic tool change.

Description

Technical Field

[0001] The invention relates to the technical field of cutting equipment, in particular to an EVA underwater granulator with convenient replacement of cutter heads. Background Art

[0002] Underwater pelletizer is a device that extrude molten polymer through a die head and cools and solidifies it into pellets underwater. Its working principle is to melt the plastic raw material at high temperature, then extrude it through the extruder head, and cool and solidify it into pellets underwater. Because the pellets are cooled in water, their surface is smooth, the internal structure is compact, and they have good mechanical properties.

[0003] The working process of the underwater pelletizer includes the following steps: melting: the plastic raw material is melted at high temperature; extrusion: the molten plastic is extruded through the extruder head; cooling and solidification: the extruded plastic is cooled and solidified into pellets underwater; moisture removal: the pellets are dehydrated through a centrifugal dryer to complete the pelletizing process.

[0004] Compared with traditional granulation methods, underwater granulator has the following advantages:

[0005] ‌Environmentally friendly and clean‌: The closed-loop process water pipeline ensures that the production process is colorless and odorless, protects materials and avoids secondary pollution‌.

[0006] Uniform particles: The plastic is cut by a cutter in the molten state, and the particles are regular and uniform in shape.

[0007] ‌Intelligent pelletizing‌: The pellet size and shape can be automatically adjusted according to the extrusion volume, with easy operation, high efficiency and low energy consumption‌.

[0008] ‌High efficiency and low energy consumption‌: The granulation process realizes automatic granulation, which is easy to operate, has good granule quality, and low energy consumption and production costs‌.

[0009] Underwater pelletizers are suitable for various polymers including EVA. Due to sealing requirements, the cutters of underwater pelletizers need to be installed inside the equipment. Disassembly and assembly of the cutters requires long downtime, which affects production efficiency. Summary of the invention

[0010] In order to overcome the technical defects of the prior art, the present invention provides an EVA underwater pelletizing machine with convenient replacement of the cutter head, thereby realizing automatic cutter replacement.

[0011] The technical solution adopted by the present invention is:

[0012] The EVA underwater pelletizing machine with convenient replacement of the cutter head comprises a pelletizing orifice plate, a water flow conveying system, a cutting advance and retreat system, a cutting rotary system and several tool replacement systems, wherein the pelletizing orifice plate is installed on the water flow conveying system, and the pelletizing orifice plate and the water flow conveying system form a cutting cavity, the cutting rotary system is installed on the cutting advance and retreat system, the cutting advance and retreat system drives the cutting rotary system to extend into the cutting cavity, the cutting rotary system has a rotating end, each of the tool replacement systems is installed on the rotating end of the cutting rotary system, each of the tool replacement systems comprises a tool mounting block, several replacement knives, several replacement support rods, several sensing devices and several retreat devices, and the tool mounting block is provided with A plurality of tool sliding grooves, each of the replacement knives can be slidably installed in the corresponding tool sliding groove, each of the replacement support rods is installed in the corresponding tool sliding groove, each of the replacement support rods supports the corresponding replacement knife, each of the sensing devices can be slidably installed on the replacement knife, each of the sensing devices is transmission connected with the replacement support rod, the tool mounting block is equipped with a cutting pre-compression spring and can be slidably installed on the rotating end, each of the replacement knives and the sensing device is slidingly matched with the granulation orifice plate, each of the retraction devices is installed in the tool sliding groove, each of the retraction devices is installed in the tool sliding groove and is transmission connected with the replacement knife, and the action direction of the retraction device makes the replacement knife move away from the granulation orifice plate.

[0013] Preferably, a plurality of discharge holes are provided on the granulation orifice plate, and the movement path of each of the tool replacement systems passes through the discharge holes.

[0014] Preferably, the water flow delivery system comprises a water inlet pipe, a water outlet pipe and a cutting chamber, the water inlet pipe and the water outlet pipe are respectively installed on the cutting chamber, and the water inlet pipe and the water outlet pipe are respectively connected to the cutting chamber.

[0015] Preferably, the cutting advance and retreat system comprises an advance and retreat rail and an advance and retreat plate, the advance and retreat plate is slidably mounted on the advance and retreat rail, and the cutting rotary system is mounted on the advance and retreat plate.

[0016] Preferably, the cutting rotary system includes a cutting rotary motor, a cutting rotary frame and a cutting sealing plate, wherein the cutting rotary motor is installed on the cutting advance and retreat system, the cutting rotary frame is installed on the output end of the cutting rotary motor, the cutting sealing plate is installed on the cutting advance and retreat system, the cutting sealing plate presses the side of the cutting chamber and thereby seals the cutting chamber, and the cutting rotary frame forms a rotary end.

[0017] Preferably, the replaceable support rod comprises a support rod body and an arc support plate, wherein the arc support plate is mounted on the support rod body, and the arc support plate is located at one end of the support rod body close to the sensing device.

[0018] Preferably, the sensing device includes a sensing friction block, a friction pre-compression spring and a traction rope, the two ends of the traction rope are respectively installed on the sensing friction block and the replacement support rod, the two ends of the friction pre-compression spring are respectively installed between the sensing friction block and the replacement knife, the action direction of the friction pre-compression spring pushes the sensing friction block toward the granulation orifice plate, and the sensing friction block slides along the replacement knife.

[0019] Preferably, the retraction device is a retraction rubber band.

[0020] The beneficial effects of the present invention are:

[0021] The granulation orifice plate is installed at the output end of the external EVA extruder, and the granulation orifice plate is installed on the water flow conveying system, and the granulation orifice plate and the water flow conveying system form a cutting chamber, and the cutting rotary system is installed on the cutting advance and retreat system, and the cutting advance and retreat system drives the cutting rotary system to extend into the cutting chamber, thereby realizing the sealing of the cutting chamber, and the cutting rotary system has a rotating end, and each tool replacement system is installed on the rotating end of the cutting rotary system, so that each tool replacement system is pressed on the granulation orifice plate to rotate to realize pelletizing, and the water flows in the water flow conveying system, which on the one hand carries away the cut particles, and on the other hand quickly cools the particles.

[0022] Each tool replacement system includes a tool mounting block, a plurality of replacement knives, a plurality of replacement support rods, a plurality of sensing devices and a plurality of retraction devices. A plurality of tool sliding grooves are provided on the tool mounting block. Each replacement knife can be slidably installed in the corresponding tool sliding groove. Each replacement support rod is installed in the corresponding tool sliding groove. Each replacement support rod supports the corresponding replacement knife, and thus withstands the pressure between the replacement knife and the granulation orifice plate during cutting. Each sensing device can be slidably installed on the replacement knife. Each sensing device is transmission-connected to the replacement support rod. The tool mounting block is equipped with a cutting pre-compression spring and can be slidably installed on the rotating end. Each replacement knife and the sensing device are slidingly matched with the granulation orifice plate. The retraction device is installed in the tool sliding groove and is connected to the replacement knife in a transmission manner. The action direction of the retraction device makes the replacement knife move away from the granulation hole plate. During the sliding process of each replacement knife along the granulation hole plate, the molten material flowing out of the granulation hole plate is pelletized. The sensing device wears during the friction along the granulation hole plate, and then gradually pulls the replacement support rod during the wear process until the replacement knife loses support. The retraction device pulls the worn replacement knife away from the granulation hole plate, and then the unworn replacement knife is exposed. Then the cutting pre-compression spring squeezes the unworn replacement knife toward the granulation hole plate to realize automatic tool change. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 Schematic diagram of the tool replacement system structure.

[0025] Figure 3 for Figure 2 Enlarged schematic diagram at point A in the middle.

[0026] Figure 4 This is a schematic diagram of the status of the replacement tool in the tool replacement system after automatic replacement.

[0027] Figure 5 It is a schematic diagram of the cutting rotation system structure.

[0028] Description of reference numerals:

[0029] 1. Granulation orifice plate;

[0030] 2. Water flow conveying system; 21. Cutting chamber; 22. Water inlet pipe; 23. Water outlet pipe;

[0031] 3. Cutting advance and retreat system; 31. Advance and retreat rail; 32. Advance and retreat plate;

[0032] 4. Cutting rotary system; 41. Cutting rotary motor; 42. Cutting rotary frame; 421. Circlip mounting groove; 43. Cutting sealing plate;

[0033] 5. Tool replacement system; 51. Tool mounting block; 511. Tool sliding groove; 513. Cutting pre-compression spring; 52. Replacement knife; 53. Replacement support rod; 531. Arc support plate; 532. Support rod body; 54. Sensing device; 541. Sensing friction block; 542. Friction pre-compression spring; 543. Traction rope; 55. Retraction device. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] like Figure 1 — Figure 5 As shown, the present embodiment provides an EVA underwater pelletizing machine with convenient replacement of cutter heads, including a pelletizing orifice plate 1, a water flow conveying system 2, a cutting advance and retreat system 3, a cutting rotary system 4 and a plurality of tool replacement systems 5. The pelletizing orifice plate 1 is installed at the output end of an externally connected EVA extruder. The EVA extruder adopts a conventional commercially available screw extruder, which will not be described in detail herein. The pelletizing orifice plate 1 is installed on the water flow conveying system 2, and the pelletizing orifice plate 1 and the water flow conveying system 2 form a cutting chamber 21. The cutting rotary system 4 is installed on the cutting advance and retreat system 3. The cutting advance and retreat system 3 drives the cutting rotary system 4 to extend into the cutting chamber 21, thereby achieving sealing of the cutting chamber 21. The cutting rotary system 4 has a rotating end, and each tool replacement system 5 is installed on the rotating end of the cutting rotary system 4, so that each tool replacement system 5 is pressed on the pelletizing orifice plate 1 to rotate to achieve pelletizing. The water flows in the water flow conveying system 2, which, on the one hand, carries away the cut particles, and on the other hand, quickly cools the particles.

[0036] Each tool replacement system 5 includes a tool mounting block 51, a plurality of replacement knives 52, a plurality of replacement support rods 53, a plurality of sensing devices 54 and a plurality of retraction devices 55. The tool mounting block 51 is provided with a plurality of tool sliding grooves 511. Each replacement knife 52 can be slidably installed in the corresponding tool sliding groove 511. Each replacement support rod 53 is installed in the corresponding tool sliding groove 511. Each replacement support rod 53 supports the corresponding replacement knife 52, and thus withstands the pressure between the replacement knife 52 and the granulation hole plate 1 during cutting. Each sensing device 54 can be slidably installed on the replacement knife 52. Each sensing device 54 is transmission-connected to the replacement support rod 53. The tool mounting block 51 is equipped with a cutting pre-compression spring 513 and can be slidably installed on the rotating end. Each replacement knife 52 and the sensing device 54 are connected to the granulation hole plate 1. The plate 1 slides together, and each retraction device 55 is installed in the tool sliding groove 511. Each retraction device 55 is installed in the tool sliding groove 511 and is connected to the replacement knife 52 in transmission. The action direction of the retraction device 55 makes the replacement knife 52 move away from the granulation hole plate 1. During the sliding process of each replacement knife 52 along the granulation hole plate 1, the molten material flowing out of the granulation hole plate 1 is pelletized. The sensing device 54 wears during the friction process along the granulation hole plate 1, and then gradually pulls the replacement support rod 53 during the wear process until the replacement knife 52 loses support. The retraction device 55 pulls the worn replacement knife 52 away from the granulation hole plate 1, and then exposes the unworn replacement knife 52. Then the cutting pre-compression spring 513 squeezes the unworn replacement knife 52 toward the granulation hole plate 1 to realize automatic knife change.

[0037] The core design idea of ​​the tool replacement system 5 mentioned above is to gradually wear out the sensing device 54 through long-term friction between the sensing device 54, which is more susceptible to wear than the replacement knife 52, and the granulation orifice plate 1, so that the sensing device 54 pulls the replacement support rod 53 out of the tool sliding groove 511, and the wear degree of the replacement knife 52 is reflected by the wear degree of the sensing device 54, so that the worn replacement knife 52 retreats under the drive of the retreat device 55, and the new replacement knife 52 that has not been worn is pushed by the cutting pre-compression spring 513 to contact with the granulation orifice plate 1, thereby realizing automatic tool change, facilitating centralized replacement of worn replacement knives 52, reducing downtime and improving production efficiency.

[0038] After all the replacement knives 52 are worn out, when all new replacement knives 52 are replaced, in order to reduce the replacement cost, only the replacement knives 52 are replaced. Specifically, the replacement knife 52 is provided with a hook for hooking the retraction device 55, so that when disassembling the replacement knife 52, it is only necessary to unhook the retraction device 55 to complete the disassembly of the replacement knife 52. On the other hand, a hook for hooking the other end of the retraction device 55 also needs to be provided at the end of the tool sliding groove 511.

[0039] Specifically, a plurality of discharge holes are provided on the granulation orifice plate 1, and the movement path of each tool replacement system 5 passes through the discharge holes, and the molten material is extruded from the discharge holes. When the tool replacement system 5 passes over each discharge hole, the granules are formed.

[0040] Specifically, the water flow conveying system 2 includes an inlet pipe 22, an outlet pipe 23 and a cutting chamber 21. The inlet pipe 22 and the outlet pipe 23 are respectively installed on the cutting chamber 21. The inlet pipe 22 and the outlet pipe 23 are respectively connected to the cutting chamber 21 to realize water flow conveyance in the cutting chamber 21.

[0041] Specifically, the cutting advance and retreat system 3 includes an advance and retreat rail 31 and an advance and retreat plate 32. The advance and retreat plate 32 can be slidably installed on the advance and retreat rail 31. The cutting rotary system 4 is installed on the advance and retreat plate 32. The advance and retreat plate 32 slides along the advance and retreat rail 31 to realize that the cutting rotary system 4 is pressed on the granulation orifice plate 1 to realize cutting, or is separated from the granulation orifice plate 1 when the tool replacement system 5 is replaced. The advance and retreat plate 32 is driven by a conventional motor or cylinder, which will not be repeated here.

[0042] Specifically, the cutting rotary system 4 includes a cutting rotary motor 41, a cutting rotary frame 42 and a cutting sealing plate 43. The cutting rotary motor 41 is installed on the cutting advance and retreat system 3, and the cutting rotary frame 42 is installed at the output end of the cutting rotary motor 41. A sealing ring is provided on the cutting sealing plate 43, and the cutting sealing plate 43 is installed on the cutting advance and retreat system 3. The cutting sealing plate 43 presses the side of the cutting chamber 21 and thus seals the cutting chamber 21. The cutting rotary frame 42 forms a rotating end, and the cutting rotary motor 41 drives the cutting rotary frame 42 to rotate. The tool mounting block 51 is installed with a cutting pre-compression spring 513 and is slidably installed on the cutting rotary frame 42. The cutting pre-compression spring 513 squeezes the tool mounting block 51 and the replacement knife 52 on the tool mounting block 51 toward the granulation hole plate 1.

[0043] Specifically, the tool mounting block 51 can be slidably mounted on the cutting rotary frame 42 through a dovetail groove sliding pair, and a cutting pre-stressing spring 513 is also installed on the tool mounting block 51. A retaining spring mounting groove 421 is provided on the cutting rotary frame 42, and a tool pushing plate (not shown in the figure) is installed on the retaining spring mounting groove 421 through a retaining spring. The other end of the cutting pre-stressing spring 513 is pressed on the tool pushing plate, so that the tool mounting block 51 is pushed toward the granulation orifice plate 1 under the pushing of the cutting pre-stressing spring 513, so as to press the replacement knife 52 onto the granulation orifice plate 1.

[0044] Specifically, the replacement support rod 53 includes a support rod body 532 and an arc support plate 531. The arc support plate 531 is installed on the support rod body 532. The arc support plate 531 is located at the end of the support rod body 532 close to the sensing device 54. After being pulled by the sensing device 54, the arc support plate 531 can still maintain support for the replacement support rod 53 for a period of time until the entire arc support plate 531 is separated from the tool sliding groove 511.

[0045] Specifically, the sensing device 54 includes a sensing friction block 541, a friction pre-compression spring 542 and a traction rope 543. The two ends of the traction rope 543 are respectively installed on the sensing friction block 541 and the replacement support rod 53. The two ends of the friction pre-compression spring 542 are respectively installed between the sensing friction block 541 and the replacement knife 52. The action direction of the friction pre-compression spring 542 pushes the sensing friction block 541 toward the granulation hole plate 1. The sensing friction block 541 slides along the replacement knife 52 through the dovetail groove sliding pair. The sensing friction block 541 is made of polyethylene. During the sliding process of the sensing friction block 541 along the granulation orifice plate 1, it is gradually worn, thereby driving the movement of the traction rope 543, and then driving the replacement support rod 53 to disengage from the tool sliding groove 511, and then the worn replacement knife 52 retreats under the drive of the retreat device 55, and the new replacement knife 52 is pressed toward the granulation orifice plate 1 again under the push of the cutting pre-compression spring 513. In order to ensure that the elastic retreat device 55 is a retreat rubber band, it is worth noting that by selecting sensing friction blocks 541 of different lengths and hardnesses, the replacement time of the replacement knife 52 can be controlled.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The EVA underwater pelletizing machine is easy to replace the blade, characterized by: It includes a granulation orifice plate, a water flow conveying system, a cutting advance and retreat system, a cutting rotary system and several tool replacement systems. The granulation orifice plate is installed on the water flow conveying system, and the granulation orifice plate and the water flow conveying system form a cutting cavity. The cutting rotary system is installed on the cutting advance and retreat system. The cutting advance and retreat system drives the cutting rotary system to extend into the cutting cavity. The cutting rotary system has a rotating end. Each of the tool replacement systems is installed on the rotating end of the cutting rotary system. Each of the tool replacement systems includes a tool mounting block, several replacement knives, several replacement support rods, several sensing devices and several retraction devices. The tool mounting block is provided with several tool sliding grooves. Each of the replacement knives can be slidably installed in the corresponding tool sliding groove. Each of the replacement support rods is installed in the corresponding tool sliding groove. Each of the replacement support rods supports the corresponding replacement knife. Each of the sensing devices can be slidably installed On the replacement knife, each of the sensing devices is transmission-connected with the replacement support rod, the knife mounting block is equipped with a cutting pre-stressing spring and is slidably mounted on the rotating end, each of the replacement knives and the sensing device is slidingly matched with the granulation orifice plate, each of the retraction devices is installed in the knife sliding groove, each of the retraction devices is installed in the knife sliding groove and is transmission-connected with the replacement knife, the action direction of the retraction device makes the replacement knife move away from the granulation orifice plate, the sensing device comprises a sensing friction block, a friction pre-stressing spring and a traction rope, the two ends of the traction rope are respectively mounted on the sensing friction block and the replacement support rod, the two ends of the friction pre-stressing spring are respectively mounted between the sensing friction block and the replacement knife, the action direction of the friction pre-stressing spring pushes the sensing friction block toward the granulation orifice plate, the sensing friction block slides along the replacement knife, the sensing friction block is made of polyethylene, and the retraction device is a retraction rubber band.

2. The EVA underwater pelletizing machine with convenient blade replacement according to claim 1 is characterized in that: The granulation orifice plate is provided with a plurality of discharge holes, and the movement path of each tool replacement system passes through the discharge holes.

3. The EVA underwater pelletizing machine with convenient blade replacement according to claim 1 is characterized in that: The water flow conveying system comprises a water inlet pipe, a water outlet pipe and a cutting chamber. The water inlet pipe and the water outlet pipe are respectively installed on the cutting chamber, and the water inlet pipe and the water outlet pipe are respectively connected to the cutting chamber.

4. The EVA underwater pelletizing machine with convenient blade replacement according to claim 1, characterized in that: The cutting advance and retreat system comprises an advance and retreat rail and an advance and retreat plate. The advance and retreat plate is slidably mounted on the advance and retreat rail, and the cutting rotary system is mounted on the advance and retreat plate.

5. The EVA underwater pelletizing machine with convenient blade replacement according to claim 1 is characterized in that: The cutting rotary system includes a cutting rotary motor, a cutting rotary frame and a cutting sealing plate. The cutting rotary motor is installed on the cutting advance and retreat system. The cutting rotary frame is installed on the output end of the cutting rotary motor. The cutting sealing plate is installed on the cutting advance and retreat system. The cutting sealing plate presses the side of the cutting chamber and then seals the cutting chamber. The cutting rotary frame forms a rotary end.

6. The EVA underwater pelletizing machine with convenient blade replacement according to claim 1, characterized in that: The replaceable support rod comprises a support rod body and an arc support plate, wherein the arc support plate is mounted on the support rod body and is located at one end of the support rod body close to the sensing device.

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