A head structure of a plastic sheet processing foaming machine

Abstract

The present invention relates to a head structure of a plastic sheet processing foaming machine, comprising a head body, an upper machine nozzle, a lower machine nozzle, and a feed channel, a sliding cavity is provided on the head body, the upper machine nozzle is connected to the sliding cavity by sliding along the vertical direction, a discharge channel connected to the feed channel is formed between the upper machine nozzle and the lower machine nozzle, and a driving component for driving the upper machine nozzle to slide is also provided on the head body; a plurality of electric heating rods are inserted into the upper machine nozzle, a knob potentiometer is provided in the sliding cavity, and the plurality of electric heating rods are electrically connected to the knob potentiometer through a wire; a power socket is provided on the head body, and the power socket is electrically connected to the knob potentiometer; the knob of the knob potentiometer is connected to the upper machine nozzle through a first connecting component, and the knob of the knob potentiometer is driven to rotate through the first connecting component when the upper machine nozzle slides. The present invention can automatically adjust the temperature of the upper machine nozzle according to the thickness of the produced plate.

Description

Technical Field

[0001] The invention relates to the field of foaming machines, in particular to a head structure of a foaming machine for processing plastic plates. Background Art

[0002] In the production of plastic sheets, a foaming machine is required to mix and heat the sheet raw materials with the foaming materials. The heated sheet raw materials are extruded through the outlet of the foaming machine head and then enter the shaping equipment for shaping. An electric heating rod is placed on the head of the foaming machine, so that the head can heat and keep the hot-melt sheet raw materials warm to ensure the temperature of the sheet raw materials.

[0003] The outlet height of the foaming machine head can be adjusted, so that one production line can produce boards of different thickness specifications. When the extrusion pressure of the foaming machine is constant, raising the outlet height of the foaming machine head will slow down the transmission speed of the board raw materials, so that the board raw materials need more transmission time to enter the shaping equipment. If the transmission time of the board raw materials becomes longer, the temperature of the hot melt raw materials on the surface of the board raw materials will be relatively low when entering the shaping equipment, and they cannot be well shaped in the shaping equipment.

[0004] In order to ensure the quality of sheet shaping, when producing sheets of different thicknesses, it is necessary to stop the machine and add or remove appropriate electric heating rods at the outlet of the head to control the temperature of the foaming machine head, thereby ensuring the original heating and heat preservation effect of the foaming machine head on the sheet. This ensures that the sheet material still has a suitable temperature after being transmitted, and is better shaped when entering the shaping equipment, thereby improving the molding quality of the product. However, the placement and removal of the electric heating rod requires the completion of wiring, disassembly of the foaming machine head, etc., which is very cumbersome and time-consuming. Summary of the invention

[0005] The present application provides a head structure of a plastic sheet processing foaming machine, which can automatically adjust the temperature of the machine nozzle according to the thickness of the produced sheet, ensure the temperature of the sheet raw material during transmission, and ensure the processability of the sheet raw material.

[0006] The present application provides a plastic sheet processing foaming machine head structure adopts the following technical solution:

[0007] A head structure of a plastic sheet processing foaming machine comprises a head body, an upper machine nozzle, a lower machine nozzle and a feed channel are arranged on the head body, a sliding cavity is arranged on the head body, the upper machine nozzle is slidably connected in the sliding cavity along the vertical direction, a discharge channel connected to the feed channel is formed between the upper machine nozzle and the lower machine nozzle, and a driving component for driving the upper machine nozzle to slide is also arranged on the head body; a plurality of electric heating rods are arranged in the upper plug of the upper machine nozzle, a knob potentiometer is arranged in the sliding cavity, and the plurality of electric heating rods are electrically connected to the knob potentiometer through a wire; a power socket is arranged on the head body, and the power socket is electrically connected to the knob potentiometer; the knob of the knob potentiometer is connected to the upper machine nozzle through a first connecting component, and when the upper machine nozzle moves upward, the knob of the knob potentiometer is driven to rotate through the first connecting component to reduce the resistance of the knob potentiometer.

[0008] By adopting the above technical solution, when the driving component drives the upper machine nozzle to move upward, the discharge channel becomes larger, so that the plate extruded from the discharge channel becomes thicker. When the upper machine nozzle moves upward, the knob of the knob potentiometer is driven to rotate positively through the first connecting component, thereby reducing the resistance of the knob potentiometer, so that the working current entering the wire one and multiple electric heating rods through the knob potentiometer increases, thereby increasing the temperature of the electric heating rod, so that the temperature of the upper machine nozzle is increased, and the heating effect of the upper machine nozzle on the plate raw material is improved, the temperature of the plate raw material during transmission is guaranteed, and the processability of the plate raw material is ensured. Similarly, when the upper machine nozzle moves downward, the discharge channel becomes smaller and the plate extruded from the machine head becomes thinner. When the upper machine nozzle moves downward, the knob of the knob potentiometer will be driven to rotate in the opposite direction through the first connecting component, thereby increasing the resistance of the knob potentiometer, and reducing the working current entering the wire one and multiple heating rods through the knob potentiometer, thereby lowering the temperature of the heating rods and the upper machine nozzle, achieving the purpose of saving electricity while ensuring the heating effect of the upper machine nozzle on the plate raw material, ensuring that the temperature of the plate entering the shaping equipment is in a more suitable temperature range, and can cool relatively quickly after the plate is shaped, reducing the probability of deformation of the shaped plate during the transmission process.

[0009] Preferably, the first connecting component includes a gear sleeved on the knob of the knob potentiometer and a rack provided on the upper machine mouth, and the gear is meshed with the rack.

[0010] By adopting the above technical solution, when the upper machine nozzle moves up, the gear is driven by the rack to rotate forward, so that the knob of the knob potentiometer rotates forward. When the upper machine nozzle moves down, it descends with the rack, and when the rack descends, the gear is driven by the rack to rotate reversely, so that the knob of the knob potentiometer rotates reversely.

[0011] Preferably, an assembly groove connected to the sliding cavity is provided on the head body, and a cover plate is detachably connected to the assembly groove, and a storage tube is provided on the cover plate; the electric wire one includes a main line arranged in the storage tube, a first wire connector electrically connected to the main line, and multiple branch wires, the first wire connector is fixed on the storage tube, and a second wire connector that is plugged into and cooperates with the first wire connector is provided on the side wall of the sliding cavity, the second wire connector is electrically connected to the knob potentiometer, and the multiple branch wires are respectively electrically connected to multiple heating rods.

[0012] By adopting the above technical solution, when the cover needs to be removed for maintenance of the machine head body, the cover is directly pulled up to unplug the first wire connector from the second wire connector, automatically releasing the electrical connection between wire one and the knob potentiometer, while reducing the probability of the main line breaking when the cover is removed.

[0013] Preferably, the storage tube is provided with multiple mounting tubes, and the bottoms of the multiple mounting tubes are rotatably connected to the limiting tube, the limiting tube is provided with an inclined groove and a limiting groove, and the top notch of the inclined groove is communicated with the limiting groove; a torsion spring is sleeved on the mounting tube, and the torsion spring is connected to the limiting tube and is used to drive the limiting tube to move and reset; the electric heating rod is provided with a first limiting rod, and the bottom notch of the inclined groove is located on the movement path of the first limiting rod in the initial state, and when the first limiting rod moves into the inclined groove, it presses against the groove wall of the inclined groove to rotate the limiting tube, and when the first limiting rod moves to the highest point, it enters the limiting groove and conflicts with the groove wall of the limiting groove away from the inclined groove.

[0014] By adopting the above technical solution, when the electric heating rod on the upper machine nozzle is to be removed, the driving assembly drives the upper machine nozzle and multiple electric heating rods to move upward. During the upward movement of the electric heating rod, the first limit rod will enter the inclined groove and press against the groove wall of the inclined groove to drive the limit tube to rotate. The rotation of the limit tube will cause the torsion spring to rotate under force. When the electric heating rod rises to the highest position, the first limit rod moves to the connecting port between the limit groove and the inclined groove. The first limit rod no longer presses against the groove wall of the inclined groove. At this time, the torsion spring rotates and resets and drives the limit tube to rotate and reset, so that the first limit rod enters the limit groove and finally makes the first limit rod conflict with the groove wall away from the limit groove. When removing the cover plate later, the multiple electric heating rods can be pulled out from the upper machine nozzle by directly pulling up the cover plate with a crane, which is convenient and quick.

[0015] Preferably, a protective tube is slidably connected inside the installation tube along the axial direction of the installation tube, the bottom of the protective tube abuts against the electric heating rod, and the branch line passes through the installation tube and the protective tube and then is electrically connected to the electric heating rod.

[0016] By adopting the above technical solution, the branch line is prevented from bending between the electric heating rod and the installation tube during the rising process of the electric heating rod, thereby preventing the branch line from being squeezed by the installation tube during the rising process of the electric heating rod.

[0017] Preferably, a third wire connector is provided at the bottom of the protective tube, a fourth wire connector that is plugged into and cooperates with the third wire connector is provided at the top of the electric heating rod, and the branch line is electrically connected to the third wire connector; a spring is provided inside the mounting tube, and the elastic force of the spring acts on the protective tube, and the spring always presses the mounting tube against the electric heating rod.

[0018] By adopting the above technical solution, the connection stability between the third wire connector and the fourth wire connector is ensured in the process of moving the electric heating rod up and down.

[0019] Preferably, the driving assembly includes two motors and two screw rods located in the sliding cavity, the two screw rods are rotatably connected to the machine head body, the two screw rods are respectively located on both sides of the sliding cavity, the two screw rods are respectively connected to the output shafts of the two motors, and the two ends of the upper machine nozzle are respectively threadedly connected to the two screw rods.

[0020] By adopting the above technical solution, two motors drive two screw rods to rotate so as to control the up and down sliding of the upper nozzle.

[0021] The technical effects of the present invention are mainly reflected in the following aspects:

[0022] 1. The present invention can automatically adjust the temperature of the machine nozzle according to the thickness of the produced plate, ensure the temperature of the plate raw material during transmission, and ensure the processability of the plate raw material;

[0023] 2. The present invention can facilitate technicians to disassemble the electric heating rod on the upper nozzle;

[0024] 3. The present invention can protect the branch line and ensure the stability of the electrical connection between the branch line and the electric heating rod when the electric heating rod moves up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the foaming machine and the machine head.

[0026] Figure 2 It is a schematic diagram of the structure of the machine head.

[0027] Figure 3 yes Figure 2 Sectional view of the middle nose along line AA.

[0028] Figure 4 yes Figure 2 Cross-sectional view of the middle machine head along line BB.

[0029] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle.

[0030] Figure 6 yes Figure 2 Partial cross-sectional view of the center nose.

[0031] Figure 7 yes Figure 6 A partial enlarged view of point D in the middle.

[0032] Figure 8 yes Figure 6 Schematic diagram of the structure when the first limit rod moves into the inclined slot.

[0033] Fig. 9 yes Figure 8 A partial enlarged view of point E in the middle.

[0034] Fig.10 yes Figure 6 Schematic diagram of the structure when the first limiting rod moves into the limiting groove.

[0035] Fig.11 yes Fig.10 A partial enlarged view of point F in the middle.

[0036] 1. Main body of the machine head; 11. Upper machine nozzle; 12. Lower machine nozzle; 13. Feed channel; 14. Sliding cavity; 15. Discharge channel; 16. Power socket; 17. Assembly groove; 2. Drive assembly; 21. Motor; 22. Screw rod; 3. Heating rod; 31. Fourth wire connector; 4. Knob potentiometer; 41. Second wire connector; 5. Wire one; 51. Main line; 52. First wire connector; 53. Branch line; 6. First connecting assembly; 61. Gear; 62. Rack; 71. Cover plate; 72. Storage tube; 73. Mounting tube; 74. Limiting tube; 741. Bevel groove; 742. Limiting groove; 75. Torsion spring; 76. First limiting rod; 77. Protective tube; 78. Third wire connector; 79. Spring; 8. Threaded hole. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings to make the technical solution of the present application easier to understand and grasp.

[0038] Reference Figure 1-Figure 3 The embodiment of the present invention is a head structure of a plastic sheet processing foaming machine, comprising a head body 1, which is connected to the foaming machine. The head body 1 is provided with an upper nozzle 11, a lower nozzle 12, and a feed channel 13, and the feed channel 13 is connected to the discharge port of the foaming machine. The head body 1 is provided with a sliding cavity 14, and the upper nozzle 11 is slidably connected in the sliding cavity 14 along the vertical direction, and a discharge channel 15 connected to the feed channel 13 is formed between the upper nozzle 11 and the lower nozzle 12.

[0039] Reference Figure 3The machine head body 1 is also provided with a driving assembly 2 for driving the upper machine nozzle 11 to slide. The driving assembly 2 includes two motors 21 and two screw rods 22 located in the sliding cavity 14. The two motors 21 are respectively located at two sides of the sliding cavity 14. The two screw rods 22 are respectively connected to the output shafts of the two motors 21. The two ends of the upper machine nozzle 11 are respectively threadedly connected to the two screw rods 22.

[0040] Reference Figure 2 , Figure 4 and Figure 5 , a plurality of electric heating rods 3 are inserted into the upper machine nozzle 11. A knob potentiometer 4 is installed on the inner wall of the sliding cavity 14, and the knob potentiometer 4 is located above the upper machine nozzle 11. The plurality of electric heating rods 3 are electrically connected to the knob potentiometer 4 through a wire 5. A power socket 16 is provided on the machine head body 1, and the power socket 16 is electrically connected to the knob potentiometer 4.

[0041] Reference Figure 2 , Figure 4 and Figure 5 , wherein the head body 1 is provided with an assembly groove 17 connected to the sliding cavity 14, and the assembly groove 17 is located directly above the plurality of electric heating rods 3. A cover plate 71 is detachably connected to the assembly groove 17, and the cover plate 71 is fixed to the assembly groove 17 by a plurality of bolts. A storage tube 72 is fixed to the cover plate 71, and the storage tube 72 is located in the sliding cavity 14. The cover plate 71 is provided with a threaded hole 8 for the connection of a lifting ring.

[0042] Reference Figure 2 , Figure 4 and Figure 5 , wherein the wire 1 5 includes a main wire 51 installed in the storage tube 72, a first wire connector 52 electrically connected to the main wire 51, and a plurality of branch wires 53, and the plurality of branch wires 53 are electrically connected to the plurality of electric heating rods 3 respectively. The first wire connector 52 is fixed on the storage tube 72. A second wire connector 41 plug-fitting with the first wire connector 52 is installed on the side wall of the sliding cavity 14, and the second wire connector 41 is located above the knob potentiometer 4, and the second wire connector 41 is electrically connected to the knob potentiometer 4.

[0043] Reference Figure 2 , Figure 4-Figure 7, multiple mounting tubes 73 are welded below the storage tube 72, and the multiple mounting tubes 73 are respectively located above the multiple electric heating rods 3, and the axes of the multiple mounting tubes 73 are perpendicular to and intersect with the axes of the storage tube 72. The bottoms of the multiple mounting tubes 73 are rotatably connected to the limiting tube 74, and the limiting tube 74 is provided with an inclined groove 741 and a limiting groove 742, and the top notch of the inclined groove 741 is connected to the limiting groove 742, wherein the top notch of the inclined groove 741 refers to the notch of the inclined groove 741 away from the electric heating rod 3. A torsion spring 75 is sleeved on the mounting tube 73, one end of the torsion spring 75 is connected to the mounting tube 73, and the other end of the torsion spring 75 is connected to the limiting tube 74, and the torsion spring 75 drives the limiting tube 74 to move and reset.

[0044] Reference Figure 4-Figure 7 A first limiting rod 76 is fixed on the top of the electric heating rod 3. In the initial state, the bottom notch of the inclined groove 741 is located on the movement path of the first limiting rod 76. When the first limiting rod 76 moves into the inclined groove 741, it presses against the groove wall of the inclined groove 741 to rotate the limiting tube 74. When the first limiting rod 76 moves to the highest point, it enters the limiting groove 742 and conflicts with the groove wall of the limiting groove 742 away from the inclined groove 741.

[0045] Reference Figure 2 , Figure 4 and Figure 5 A protective tube 77 is slidably connected in the mounting tube 73 along the axial direction of the mounting tube 73, a third wire connector 78 is installed at the bottom of the protective tube 77, the branch line 53 extends into the mounting tube 73 and the protective tube 77 and then is electrically connected to the third wire connector 78, and a fourth wire connector 31 is installed on the top of the electric heating rod 3 to be plugged with the third wire connector 78. A spring 79 is placed in the mounting tube 73, the elastic force of the spring 79 acts on the protective tube 77, and the spring 79 always presses the mounting tube 73 against the electric heating rod 3 to ensure that the third wire connector 78 and the fourth wire connector 31 are plugged stably.

[0046] Reference Figure 2 , Figure 4 and Figure 5 The knob of the knob potentiometer 4 is connected to the upper machine mouth 11 through the first connecting component 6. When the upper machine mouth 11 slides, the knob of the knob potentiometer 4 is driven to rotate through the first connecting component 6. The first connecting component 6 includes a gear 61 sleeved on the knob of the knob potentiometer 4 and a rack 62 fixed on the upper machine mouth 11, and the gear 61 is meshed with the rack 62.

[0047] The steps for adjusting the thickness and temperature of the plate by the die head in this application are as follows:

[0048] Reference Figure 2-Figure 5When the thickness of the produced plate needs to be increased, the two motors 21 are started to drive the two screws 22 to rotate so that the upper machine nozzle 11 moves up. When the upper machine nozzle 11 moves up, the discharge channel 15 becomes larger, so that the plate extruded from the discharge channel 15 becomes thicker. When the upper machine nozzle 11 moves up, the gear 61 is driven by the rack 62 to rotate forward, so that the knob of the knob potentiometer 4 rotates forward, thereby reducing the resistance of the knob potentiometer 4, so that the working current entering the multiple electric heating rods 3 through the wire 15 increases, thereby increasing the temperature of the electric heating rods 3, so that the temperature of the upper machine nozzle 11 increases, and the heating effect of the upper machine nozzle 11 on the plate raw material is improved, so as to ensure the temperature of the plate raw material during transmission and ensure the processability of the plate raw material.

[0049] Reference Figure 2-Figure 5 When the thickness of the produced plate needs to be reduced, the two motors 21 are started to drive the two screws 22 to rotate so that the upper machine nozzle 11 moves downward. When the upper machine nozzle 11 moves downward, the discharge channel 15 becomes smaller and the plate extruded from the discharge channel 15 becomes thinner. When the upper machine nozzle 11 moves downward, the gear 61 is driven to rotate in the opposite direction through the rack 62, thereby driving the knob of the knob potentiometer 4 to rotate in the opposite direction, thereby increasing the resistance of the knob potentiometer 4, so that the working current entering the wire 15 and the multiple electric heating rods 3 is reduced, thereby lowering the temperature of the electric heating rods 3 and the upper machine nozzle 11, achieving the purpose of saving electricity while ensuring the heating effect of the upper machine nozzle 11 on the plate raw material, ensuring that the temperature of the plate entering the shaping device is in a more suitable temperature range, and the plate can be cooled relatively quickly after shaping, reducing the probability of deformation of the shaped plate during the transmission process.

[0050] Reference Figure 6-Figure 11 When the electric heating rod 3 on the upper nozzle 11 is to be removed, the two motors 21 are started to drive the two screw rods 22 to rotate so that the upper nozzle 11 and the plurality of electric heating rods 3 are moved upward. The first limiting rod 76 enters the inclined groove 741 and presses against the groove wall of the inclined groove 741 to drive the limiting tube 74 to rotate, and the rotation of the limiting tube 74 causes the torsion spring 75 to rotate under force.

[0051] Reference Figure 6-Figure 11 When the electric heating rod 3 rises to the highest position, the first limiting rod 76 moves to the connecting port between the limiting groove 742 and the inclined groove 741, and the first limiting rod 76 no longer presses against the groove wall of the inclined groove 741. At this time, the torsion spring 75 rotates and resets and drives the limiting tube 74 to rotate and reset, so that the first limiting rod 76 enters the limiting groove 742 and finally makes the first limiting rod 76 conflict with the groove wall of the limiting groove 742 away from the inclined groove 741.

[0052] Reference Figure 6-Figure 11, then remove the multiple bolts used to fix the cover plate 71, and then install the lifting ring in the threaded hole 8. Subsequently, the lifting ring installed on the cover plate 71 is hooked with a crane, and then the cover plate 71 is pulled up by the crane to pull out the multiple electric heating rods 3 from the upper machine nozzle 11, and at the same time, the plug-in cooperation between the first wire connector 52 and the second wire connector 41 can be released, which is convenient and quick.

[0053] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A head structure of a plastic sheet processing foaming machine, comprising a head body (1), characterized in that: The machine head body (1) is provided with an upper machine nozzle (11), a lower machine nozzle (12), and a feed channel (13); the machine head body (1) is provided with a sliding cavity (14); the upper machine nozzle (11) is slidably connected in the sliding cavity (14) along the vertical direction; a discharge channel (15) connected to the feed channel (13) is formed between the upper machine nozzle (11) and the lower machine nozzle (12); the machine head body (1) is also provided with a driving component (2) for driving the upper machine nozzle (11) to slide; a plurality of electric heating rods (3) are inserted into the upper machine nozzle (11); A knob potentiometer (4) is provided in the sliding cavity (14), and the plurality of electric heating rods (3) are electrically connected to the knob potentiometer (4) through a wire (5); a power socket (16) is provided on the machine head body (1), and the power socket (16) is electrically connected to the knob potentiometer (4); the knob of the knob potentiometer (4) is connected to the upper machine mouth (11) through a first connecting component (6), and when the upper machine mouth (11) moves upward, the knob of the knob potentiometer (4) is driven to rotate through the first connecting component (6) to reduce the resistance of the knob potentiometer (4).

2. The head structure of a plastic sheet processing foaming machine according to claim 1, characterized in that: The first connecting component (6) comprises a gear (61) sleeved on the knob of the knob potentiometer (4) and a rack (62) provided on the upper machine mouth (11), and the gear (61) is meshed with the rack (62).

3. The head structure of a plastic sheet processing foaming machine according to claim 1, characterized in that: The head body (1) is provided with an assembly groove (17) connected to the sliding cavity (14), and a cover plate (71) is detachably connected in the assembly groove (17), and a storage tube (72) is provided on the cover plate (71); the electric wire (5) comprises a main line (51) arranged in the storage tube (72), a first electric wire connector (52) electrically connected to the main line (51), and a plurality of branch wires (53), the first electric wire connector (52) is fixed on the storage tube (72), and a second electric wire connector (41) pluggable with the first electric wire connector (52) is provided on the side wall of the sliding cavity (14), the second electric wire connector (41) is electrically connected to the knob potentiometer (4), and the plurality of branch wires (53) are respectively electrically connected to the plurality of electric heating rods (3).

4. The head structure of a plastic sheet processing foaming machine according to claim 3, characterized in that: The receiving tube (72) is provided with a plurality of mounting tubes (73), the bottoms of the plurality of mounting tubes (73) are rotatably connected to a limiting tube (74), the limiting tube (74) is provided with an inclined groove (741) and a limiting groove (742), the top notch of the inclined groove (741) is connected to the limiting groove (742); a torsion spring (75) is sleeved on the mounting tube (73), the torsion spring (75) is connected to the limiting tube (74) and is used to drive the limiting tube (74) to move and reset The electric heating rod (3) is provided with a first limiting rod (76). In the initial state, the bottom notch of the inclined groove (741) is located on the movement path of the first limiting rod (76). When the first limiting rod (76) moves into the inclined groove (741), it presses against the groove wall of the inclined groove (741) to rotate the limiting tube (74). When the first limiting rod (76) moves to the highest point, it enters the limiting groove (742) and contacts the groove wall of the limiting groove (742) away from the inclined groove (741).

5. The head structure of a plastic sheet processing foaming machine according to claim 4, characterized in that: A protective tube (77) is slidably connected inside the mounting tube (73) along the axial direction of the mounting tube (73), the bottom of the protective tube (77) abuts against the electric heating rod (3), and the branch line (53) passes through the mounting tube (73) and the protective tube (77) and is then electrically connected to the electric heating rod 3.

6. The head structure of a plastic sheet processing foaming machine according to claim 5, characterized in that: A third wire connector (78) is provided at the bottom of the protective tube (77), and a fourth wire connector (31) which is plugged into and matched with the third wire connector (78) is provided at the top of the electric heating rod (3), and the branch line (53) is electrically connected to the third wire connector (78); a spring (79) is provided inside the mounting tube (73), and the elastic force of the spring (79) acts on the protective tube (77), and the spring (79) always presses the mounting tube (73) against the electric heating rod (3).

7. The head structure of a plastic sheet processing foaming machine according to claim 1, characterized in that: The driving assembly (2) comprises two motors (21) and two screw rods (22) located in the sliding cavity (14); the two screw rods (22) are rotatably connected to the machine head body (1); the two screw rods (22) are respectively located on both sides of the sliding cavity (14); the two screw rods (22) are respectively connected to the output shafts of the two motors (21); and the two ends of the upper machine nozzle (11) are respectively threadedly connected to the two screw rods (22).

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