Injection molding seat of injection molding machine
By designing a counter-rotating spiral rod and a cleaning rod in the injection unit of the injection molding machine, the problems of material waste and molding quality after injection are solved, achieving efficient cleaning and material separation, and improving the stability of the equipment and the molding quality.
Patent Information
- Application Number
- CN202511622187.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2025-12-23
AI Technical Summary
Existing injection molding machines suffer from material waste and molding quality issues after injection, including flash, burrs, material mixing, and high energy consumption.
An injection molding machine injection base was designed. Before stopping the machine, the plastic is returned to the side of the preheating device by reversing the auger. The cleaning rod slides on the inner wall of the sleeve to clean the residual plastic, prevents it from cooling and solidifying, and ensures that the new and old materials are separated without contamination.
It effectively avoids material waste, improves material changing efficiency and molding quality consistency, reduces equipment failures, and ensures the cleanliness and stability of the sleeve's interior.
Smart Images
Figure CN121179652A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to injection molding machine technical field, specifically to a kind of injection molding seat of injection molding machine. BACKGROUND
[0002] The existing injection molding machine injection molding seat most complex structure, although it can meet the performance requirements, but there is material waste situation, because screw has a certain weight, inertia is relatively big difficult to brake after injection ends, leading to the excess plastic injection into mold to make product appear flash, burr and other defects, and if through increasing lock mode force to solve the problem, then energy consumption, cost is high and mold service life is short, and when screw is retracted after injection ends, also produce reverse, so that screw will part of molten plastic back suction, although there is cutoff ring, at this time, part of plastic still appears fault situation from nozzle and pouring opening, causing plastic to be recycled into screw cylinder, and when equipment stops production, existing mode is directly turned off, when using again, then it will be turned on and heated, let plastic melt again, if producing different material materials, then directly add new material at feeding opening, and old material together, pre-discharge to outside from nozzle, this will make material waste in screw cylinder, and when mixed material is discharged, it also needs to adjust back pressure and temperature again, it is more troublesome, and if not adjusted well, then material is mixed together, to further affect material forming quality.For this reason, we propose a kind of injection molding seat of injection molding machine. SUMMARY
[0003] The present application aims to provide a kind of injection molding seat of injection molding machine to solve the problems raised in the background.
[0004] To achieve the above object, the present application provides the following technical scheme: a kind of injection molding seat of injection molding machine, including guide rail table, guide rail table is slidably connected with base, base outer middle top is fixedly installed with feeding hopper, base one side is fixedly connected with sleeve, base inside is rotatably connected with screw, screw outside equidistantly fixedly connected with multiple first helical blades, second helical blade is fixedly connected with each first helical blade near the outside of screw, first helical blade and second helical blade end close, multiple first helical blades and second helical blades are helical around screw, first helical blade and second helical blade between there is the cleaning guide rail extending to the inner wall of sleeve, second rotating rod is rotatably connected in the inner side of sleeve, first wedge is slidably installed in one end of second rotating rod, cleaning rod is fixedly connected on one side of first wedge, cleaning rod and cleaning guide rail are slidably connected.
[0005] Preferably, one end of the sleeve is fixedly connected with a limiting sleeve, the limiting sleeve is fixedly connected with a sliding groove at one end, a fourth cylinder is slidably connected on the sliding groove, a reverse block is fixedly installed on the output end of the fourth cylinder, the limiting sleeve has a protruding portion extending towards the reverse block in the middle, and the reverse block is attached to the second rotating rod through the protruding portion.
[0006] Preferably, the sleeve is provided with a limiting rail at one end, the first wedge block is in sliding connection with the limiting rail, the second rotating rod and the sliding groove are in rotating connection, and the outer part of the sleeve is a heating layer.
[0007] Preferably, the first spiral piece and the second spiral piece are both attached to the inner wall of the sleeve, the preheating device is fixedly installed on one side of the inner part of the base, and the preheating device and the spiral rod are in rotating connection.
[0008] Preferably, the sleeve is provided with a plurality of pouring pipes, each pouring pipe extends obliquely downward to the inner part of the base at one end, and the inner part of the sleeve is provided with a cavity heating section at one end.
[0009] Preferably, the cavity heating section is fixedly connected with an electromagnet at one side, the electromagnet is fixedly connected with a second wedge block at one end, the inner wall of the cavity heating section is fixedly connected with a limiting rod, the limiting rod and the second wedge block are in sliding connection, the first wedge block and the second wedge block are in abutment, the other side of the first wedge block is fixedly connected with a moving rod, the other side of the cavity heating section is fixedly connected with a spring, and the spring and the moving rod are fixedly connected.
[0010] Preferably, the base is fixedly connected with a first air cylinder at the other end, the guide rail table and the first air cylinder are fixedly connected together, the base is fixedly installed with a motor box at the top, the motor box is rotatably connected with a driving shaft at one side and bottom, the driving shaft is movably connected with a plurality of guide rods at the inner ring, the spiral rod is fixedly connected with a bearing at the other end, the bearing is fixedly connected with a contact piece at one side of the outer ring, the other side of the inner wall of the base is fixedly installed with a third air cylinder, and the third air cylinder and the contact piece are fixedly connected together.
[0011] Preferably, the base is fixedly connected with a second air cylinder at one side and one end, the second air cylinder is fixedly connected with an air pipe at one end, the air pipe is fixedly installed with a motor at the top, the motor output shaft is sleeved with a second gear, the air pipe is rotatably connected with a first rotating rod at one side, the first rotating rod is fixedly connected with a first gear at one end, the second gear and the first gear are in meshing connection, the first rotating rod is fixedly connected with a sealing nozzle at one end, and the sealing nozzle is coincided with the end part of the sleeve after rotating through the first rotating rod.
[0012] Preferably, the base is fixedly installed with a supporting table at one end, and the air pipe and the supporting table are in sliding connection.
[0013] Preferably, the base is fixedly connected with a fifth air cylinder at the other two sides, the two fifth air cylinders are fixedly connected with an extrusion plate between opposite ends, the base is in sliding connection with the extrusion plate at the inner bottom, and each pouring pipe is located between the two extrusion plates at one end.
[0014] Compared with the prior art, the present application has the following advantages: The present application drives the screw rod to reverse before the device stops, so that the screw rod retreats the plastic to the side of the preheating device, then drives the cleaning rod to brake for a short time, so that the cleaning rod slides on the cleaning rail, and the cleaning rod slides out and exceeds the edge of the first spiral piece and the second spiral piece, wherein the length of the cleaning rod is equal to the length of the first spiral piece and the second spiral piece, so that the cleaning rod can slide on the inner wall of the sleeve during rotation, so that the plastic melt stuck on the inner wall of the sleeve is cleaned, the plastic dryness in the sleeve is prevented, the cleaning rod is scraped in the inner wall during the rotation of the screw rod, and the residual melt is effectively prevented from cooling and solidifying after stopping. After the cleaning action is completed, the material replacement operation is performed again, so that the mixing pollution between new and old plastics is prevented, and the start-up failure caused by blockage is reduced. The whole process accurately coordinates the reverse time and the action time sequence of the cleaning rod through the control system, ensures the cleaning stability of the sleeve, and improves the consistency of the replacement efficiency and the forming quality. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the overall structure of the present application from another perspective; Figure 3 It is a schematic diagram of the screw rod structure of the present application; Figure 4 It is a schematic diagram of the cleaning rod structure of the present application; Figure 3 It is a schematic diagram of the enlarged structure of A in the present application; Figure 5 It is a schematic diagram of the base and screw rod structure of the present application; Figure 6 It is a schematic diagram of the enlarged structure of B in the present application; Figure 5 It is a schematic diagram of the enlarged structure of B in the present application; Figure 7 It is a schematic diagram of the enlarged structure of C in the present application; Figure 6 It is a schematic diagram of the enlarged structure of C in the present application; Figure 8 It is a schematic diagram of the base structure of the present application.
[0016] In the figure: 1, guide rail table; 2, first cylinder; 3, motor box; 4, base; 401, support table; 5, sleeve; 6, feeding hopper; 7, second cylinder; 8, first gear; 9, motor; 10, second gear; 11, air pipe; 12, first rotating rod; 13, sealing nozzle; 14, screw rod; 15, first spiral piece; 156, cleaning guide rail; 16, second spiral piece; 17, limiting rail; 18, cleaning rod; 19, first wedge; 20, driving shaft; 21, third cylinder; 22, contact piece; 23, bearing; 24, guide rod; 25, limiting sleeve; 26, reverse block; 27, fourth cylinder; 28, reversing pipe; 29, second rotating rod; 30, chute; 31, electromagnet; 32, limiting rod; 33, second wedge; 34, spring; 35, moving rod; 36, extrusion plate; 37, fifth cylinder; 38, preheating device. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0018] Please refer to Figures 1-8 The present application provides a technical solution: an injection molding seat of an injection molding machine, comprising a guide rail table 1, a base 4 is slidably connected to the guide rail table 1, a feeding hopper 6 is fixedly installed on the outer middle top of the base 4, a sleeve 5 is fixedly connected to one side of the base 4, a screw rod 14 is rotatably connected to the inside of the base 4, a plurality of first spiral pieces 15 are equidistantly fixedly connected to the outside of the screw rod 14, a second spiral piece 16 is fixedly connected to the outside of the screw rod 14 near each first spiral piece 15, the end of the first spiral piece 15 and the second spiral piece 16 is close, the plurality of first spiral pieces 15 and the second spiral pieces 16 are spirally arranged around the screw rod 14, the cleaning guide rail 156 extending to the inner wall of the sleeve 5 is arranged between the first spiral piece 15 and the second spiral piece 16, a second rotating rod 29 is rotatably connected to one side of the inside of the sleeve 5, a first wedge 19 is slidably installed at one end of the second rotating rod 29, a cleaning rod 18 is fixedly connected to one side of the first wedge 19, and the cleaning rod 18 and the cleaning guide rail 156 are slidably connected; the first spiral piece 15 and the second spiral piece 16 are attached to the inner wall of the sleeve 5, a preheating device 38 is fixedly installed on one side of the inside of the base 4, and the preheating device 38 and the screw rod 14 are rotatably connected together; the initial position of the cleaning rod 18 is located at the surface wall of the sleeve 5, and the first wedge 19 is enclosed in the inside of the sleeve 5; First of all, the plastic is put into the feeding hopper 6 by artificial, then the preheating device 38 is started to heat the plastic, then the preheating device 38 keeps low frequency work after the plastic is heated, so that the temperature of the plastic is kept in the molten state above the dry knot temperature, then the screw rod 14 is driven to rotate, the screw rod 14 can drive the first spiral blade 15 and the second spiral blade 16 to rotate synchronously in the process of rotation, so that the first spiral blade 15 and the second spiral blade 16 can push the melted plastic into one end of the sleeve 5, and the nozzle at one end of the sleeve 5 extrudes into the forming mold for pressure cooling forming, however, the screw rod 14 needs to be reversed for a while and then stopped when the device works, to ensure that the plastic is all retracted into the sleeve 5, so that the plastic is not easy to cool and is stuck at the nozzle outside the sleeve 5, and for the problem of changing materials during processing, first of all, the screw rod 14 should be reversed before the device stops, so that the screw rod 14 retreats the plastic to the side of the preheating device 38, then the cleaning rod 18 is driven to brake for a short time through the background, so that the cleaning rod 18 slides on the cleaning guide rail 156, the cleaning rod 18 slides out and exceeds the edge of the first spiral blade 15 and the second spiral blade 16, the length of the cleaning rod 18 is equal to the length of the first spiral blade 15 and the second spiral blade 16, so that the cleaning rod 18 can slide on the inner wall of the sleeve 5 in the process of rotation, so that the plastic melt stuck on the inner wall of the sleeve 5 is cleaned, to prevent the plastic in the sleeve 5 from drying, so that the cleaning rod 18 is scraped off in the process of rotation of the screw rod 14, effectively avoiding the residual melt from cooling and solidifying after stopping. After the cleaning action is finished, the material replacement operation is performed again, which can ensure that there is no mixing pollution between new and old plastics, and reduce the start-up failure caused by blockage. The whole process accurately coordinates the reverse time and the cleaning rod action time through the control system, ensures the cleanliness and stability of the sleeve, improves the material replacement efficiency and the consistency of the forming quality.
[0019] Specific, sleeve 5 inside one end fixedly connected to the limit sleeve 25, limit sleeve 25 one end fixedly connected with the sliding slot 30, the sliding slot 30 on the fourth cylinder 27 is slidably connected, the fourth cylinder 27 output end fixedly installed with the block 26, the limit sleeve 25 has a protruding part extending to the direction of block 26 in the middle, block 26 is adhered together through the protruding part and the second rotating rod 29, sleeve 5 one end is provided with a limit rail 17, the first wedge 19 and limit rail 17 slidingly connected, the second rotating rod 29 and sliding slot 30 are rotatably connected together, when the screw rod 14 reverses, the fourth cylinder 27 is synchronized back to shrink, let the fourth cylinder 27 drive the outside of block 26 and the protruding part contact, so that the protruding part reversely drives block 26 to move reversely to the second rotating rod 29, so that it causes the speed reduction effect of the second rotating rod 29, and the second rotating rod 29 is initially working when it follows the screw rod 14 to rotate, the screw rod 14 has certain speed and certain inertia in the process of stopping, so that the second rotating rod 29 in the process of speed reduction, let the second rotating rod 29 drive the cleaning rod 18 to slide on the cleaning guide rail 156, so that the cleaning rod 18 cleans the cleaning guide rail 156, so that the first wedge 19 can slide along the limit rail 17 located at one end of the sleeve 5 to the edge of the cleaning guide rail 156 close to the inner wall of the sleeve 5, so that the cleaning rod 18 can clean the entire sleeve 5 omnidirectionally, so that the plastic residue in the sleeve 5 is not produced.
[0020] The outer part of the sleeve 5 is a heating layer. When the device is installed, heating wires can be wound on the surface of the sleeve 5 to heat the melted plastic inside the sleeve 5 stably and prevent the plastic inside the sleeve 5 from drying out quickly.
[0021] Further, the sleeve 5 bottom is provided with a plurality of pouring pipes 28, each pouring pipe 28 extends to the inside of the base 4 with one end inclined downward, the inside of the sleeve 5 is provided with a cavity heating section at one end; the cavity heating section is fixedly connected with an electromagnet 31 at one side, the electromagnet 31 is fixedly connected with a second wedge 33 at one end, the inside wall of the cavity heating section is fixedly connected with a limiting rod 32, the limiting rod 32 and the second wedge 33 are slidably connected together, the first wedge 19 and the second wedge 33 abut, the first wedge 19 is fixedly connected with a moving rod 35 at the other side, the other side of the cavity heating section is fixedly connected with a spring 34, the spring 34 and the moving rod 35 are fixedly connected, when it is needed to clean the inside of the sleeve 5 and it is needed to replace the plastic, the current of the electromagnet 31 is turned off, so that the spring connected with the second wedge 33 is restored to normal, in the process of spring recovery, the second wedge 33 moves reversely to the first wedge 19, so that the first wedge 19 moves out of the sleeve 5 in the radial direction of the sleeve 5, in this process, the cleaning rod 18 is pushed outward, the cleaning rod 18 preliminarily cleans the plastic stuck on the surface of the cleaning rod 18 and the sleeve 5, then the fourth cylinder 27 is driven to retract, the plastic on the cleaning guide rail 156 is pushed away, finally the cleaning rod 18 can clean the inside of the sleeve 5.
[0022] Further, the base 4 is fixedly connected with a first cylinder 2 at the other end, the guide rail table 1 and the first cylinder 2 are fixedly connected together, the base 4 is fixedly provided with a motor box 3 at the top, the motor box 3 is rotatably connected with a drive shaft 20 at the bottom of one side, a plurality of guide rods 24 are movably connected in the inner ring of the drive shaft 20, the screw rod 14 is fixedly connected with a bearing 23 at the other end, the bearing 23 is fixedly connected with a contact sheet 22 at the outer ring of one side, a third cylinder 21 is fixedly installed on the other side of the inner wall of the base 4, the third cylinder 21 and the contact sheet 22 are fixedly connected together, when the device is used, the third cylinder 21 can be driven to stretch back and forth, so that the contact sheet 22 drives the bearing 23 to move, the bearing 23 drives the screw rod 14 to move back and forth in the sleeve 5, so that the plastic distributed around the screw rod 14 can be completely cleaned.
[0023] Further, the second cylinder 7 is fixedly connected to one end of the base 4, one end of the second cylinder 7 is fixedly connected with the air pipe 11, the motor 9 is fixedly installed at the top of the air pipe 11, the second gear 10 is sleeved on the output shaft of the motor 9, the first rotating rod 12 is rotatably connected to one side of the air pipe 11, the first gear 8 is fixedly connected to one end of the first rotating rod 12, the second gear 10 and the first gear 8 are engaged together, the first rotating rod 12 is fixedly connected with the sealing nozzle 13 at one end, the sealing nozzle 13 is coincided with the end of the sleeve 5 after rotating through the first rotating rod 12; the other end of the air pipe 11 is connected with the fan, the gas is introduced into the air pipe 11 after being heated, when the base 4 is retracted, the first cylinder 2 is retracted, the sleeve 5 is separated from the injection molding machine, the second cylinder 7 is extended, the motor 9 is driven to rotate, the second gear 10 drives the first gear 8 to rotate during the rotation of the motor 9, the first rotating rod 12 rotates during the rotation of the first gear 8, the sealing nozzle 13 is coincided with the nozzle part of the sleeve 5, the gas enters the inside of the sleeve 5, blows the plastic and increases the plastic retraction speed during the blowing process, the plastic after retraction is extruded into the inside of the base 4 through the pouring pipe 28, the solenoid valve (not shown) is installed at the port of the pouring pipe 28, the solenoid valve is opened during the retraction of the device, the pouring pipe 28 pours the plastic into the inside of the base 4.
[0024] Further, the support table 401 is fixedly installed at one end of the base 4, the air pipe 11 and the support table 401 are slidably connected, the support table 401 plays a supporting role to prevent the air pipe 11 from shaking during use.
[0025] Further, the fifth cylinder 37 is fixedly connected to the other two sides of the base 4, the extrusion plate 36 is fixedly connected between the opposite ends of the two fifth cylinders 37, the base 4 and the extrusion plate 36 are slidably connected, one end of each pouring pipe 28 is located between the two extrusion plates 36, the two fifth cylinders 37 are synchronously extended during the retraction of the device, the pair of extrusion plates 36 are close to each other, the plastic from the port of the pouring pipe 28 is received, the plastic is extruded to form a rectangular shape, which is convenient for recycling.
[0026] It should be noted that, in the present text, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.
[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An injection molding base for an injection molding machine, comprising a guide rail table (1), characterized in that: A base (4) is slidably connected to the guide rail (1). A feeding hopper (6) is fixedly installed on the top of the middle part of the base (4). A sleeve (5) is fixedly connected to one side of the base (4). A spiral rod (14) is rotatably connected inside the base (4). Multiple first spiral blades (15) are fixedly connected at equal intervals to the outside of the spiral rod (14). A second spiral blade (16) is fixedly connected to the outside of the spiral rod (14) near each first spiral blade (15). The ends of the first spiral blades (15) and the second spiral blades (16) are close to each other. Multiple first spiral blades (15) and second spiral blades (16) are spirally arranged around the spiral rod (14). A cleaning guide rail (156) extending towards the inner wall of the sleeve (5) is provided between the first spiral blades (15) and the second spiral blades (16). A second rotating rod (29) is rotatably connected to one side of the sleeve (5). A first wedge (19) is slidably installed at one end of the second rotating rod (29). A cleaning rod (18) is fixedly connected to one side of the first wedge (19). The cleaning rod (18) and the cleaning guide rail (156) are slidably connected.
2. The injection base of an injection molding machine according to claim 1, characterized in that: One end of the sleeve (5) is fixedly connected to a limiting sleeve (25), and one end of the limiting sleeve (25) is fixedly connected to a sliding groove (30). A fourth cylinder (27) is slidably connected on the sliding groove (30). A reversing block (26) is fixedly installed at the output end of the fourth cylinder (27). The limiting sleeve (25) has a protrusion extending toward the reversing block (26) in the middle. The reversing block (26) is attached to the second rotating rod (29) through the protrusion.
3. The injection molding base of an injection molding machine according to claim 2, characterized in that: The sleeve (5) has a limiting rail (17) at one end. The first wedge (19) and the limiting rail (17) are slidably connected. The second rotating rod (29) and the slide groove (30) are rotatably connected together. The outside of the sleeve (5) is a heating layer.
4. The injection base of an injection molding machine according to claim 1, characterized in that: The first spiral blade (15) and the second spiral blade (16) are both in contact with the inner wall of the sleeve (5). A preheating device (38) is fixedly installed on one side of the base (4). The preheating device (38) and the spiral rod (14) are rotatably connected together.
5. The injection base of an injection molding machine according to claim 4, characterized in that: The bottom of the sleeve (5) is equipped with multiple pouring pipes (28), each of which extends downward at one end into the base (4), and a cavity heating section is opened at one end inside the sleeve (5).
6. The injection base of an injection molding machine according to claim 5, characterized in that: An electromagnet (31) is fixedly connected to one side of the cavity heating section. A second wedge (33) is fixedly connected to one end of the electromagnet (31). A limit rod (32) is fixedly connected to the inner wall of the cavity heating section. The limit rod (32) and the second wedge (33) are slidably connected together. The first wedge (19) and the second wedge (33) abut against each other. A moving rod (35) is fixedly connected to the other side of the first wedge (19). A spring (34) is fixedly connected to the other side of the cavity heating section. The spring (34) and the moving rod (35) are fixedly connected.
7. The injection base of an injection molding machine according to claim 1, characterized in that: The base (4) is fixedly connected to the other end of the first cylinder (2), the guide rail (1) and the first cylinder (2) are fixedly connected together, the base (4) is fixedly installed with the top of the motor housing (3), the bottom of one side of the motor housing (3) is rotatably connected with the drive shaft (20), the inner ring of the drive shaft (20) is movably connected with multiple guide rods (24), the other end of the spiral rod (14) is fixedly connected with the bearing (23), the outer ring of the bearing (23) is fixedly connected with the contact piece (22), the other side of the inner wall of the base (4) is fixedly installed with the third cylinder (21), the third cylinder (21) and the contact piece (22) are fixed together.
8. The injection base of an injection molding machine according to claim 6, characterized in that: A second cylinder (7) is fixedly connected to one end of the outer side of the base (4). An air pipe (11) is fixedly connected to one end of the second cylinder (7). A motor (9) is fixedly installed on the top of the air pipe (11). A second gear (10) is sleeved on the output shaft of the motor (9). A first rotating rod (12) is rotatably connected to one side of the air pipe (11). A first gear (8) is fixedly connected to one end of the first rotating rod (12). The second gear (10) and the first gear (8) mesh together. A sealing nozzle (13) is fixedly connected to one end of the first rotating rod (12). After the sealing nozzle (13) rotates through the first rotating rod (12), it overlaps with the end of the sleeve (5).
9. The injection base of an injection molding machine according to claim 8, characterized in that: A support platform (401) is fixedly installed at one end of the base (4), and the air pipe (11) and the support platform (401) are slidably connected.
10. The injection base of an injection molding machine according to claim 5, characterized in that: The base (4) has a fifth cylinder (37) fixedly connected to both sides inside. The two fifth cylinders (37) are fixedly connected to each other with an extrusion plate (36). The bottom of the base (4) is slidably connected to the extrusion plate (36). One end of each discharge tube (28) is located between the two extrusion plates (36).