CN112677857A

CN112677857A - Tunnel construction handling equipment capable of conducting partition illumination

Info

Publication number: CN112677857A
Application number: CN202011557539.9A
Authority: CN
Inventors: 黄小红
Original assignee: Wenzhou Xuanyang Machinery Co ltd
Current assignee: Wenzhou Xuanyang Machinery Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-20

Abstract

The invention discloses tunnel construction carrying equipment capable of carrying out regional illumination, which belongs to the technical field of tunnel construction and comprises a vehicle head, a regional lamp shade, a carrying plate, a toothed plate and a top plate assembly, wherein a driving motor and an illuminating lamp are fixedly arranged at the top of the vehicle head; according to the invention, the automatic ejection side stabilizing plate is arranged on the top of the carrying plate, when an object is carried, the carrying plate of the device can be driven to move to the position below the bottom groove of the bottom of the object, at the moment, the external main motor is started, the object is lifted and carried, in the lifting process of the carrying plate, the extrusion head at the bottom of the side plate outside the device can extrude the limiting shaft of the top plate assembly to enable the limiting shaft to enter the installation inner groove of the outer top shaft, the outer top shaft loses the limiting force, the second outer top spring can automatically eject the outer top shaft, the side stabilizing plate is automatically driven to move, the object is automatically laterally fixed, the design is ingenious, the rapid lateral stabilizing effect in the object carrying process is realized, and the carrying stability is improved.

Description

Tunnel construction handling equipment capable of conducting partition illumination

Technical Field

The invention belongs to the technical field of tunnel construction, and particularly relates to tunnel construction carrying equipment capable of conducting subarea illumination.

Background

Tunnels are engineering structures buried in the ground and are a form of human use of underground space. The tunnel can be divided into traffic tunnel, hydraulic tunnel, municipal tunnel, mine tunnel, military tunnel, when needs are under construction to the tunnel, needs carry out tunnel construction, when under construction, often needs carry the transport to some materials that tunnel construction needs to use.

Chinese patent discloses (CN202020041650.1) a labor-saving type tunnel construction carrying device, which comprises a mounting plate, wherein the top of the mounting plate is provided with a lifter, spring rods are fixed at four corners of the bottom of the mounting plate, a bottom plate is fixed at the bottom of the spring rods, four rollers are symmetrically arranged at two sides of the bottom plate, the rollers corresponding to the left side and the right side are fixedly connected through a rotating shaft, the rotating shaft penetrates through two sides of the bottom plate through a bearing, a cavity is arranged at the position of the bottom plate corresponding to the rotating shaft, the device drives the whole device to move through a motor, a large amount of labor force can be saved, meanwhile, when a device for taking out the device is placed in, a rolling roller arranged at the bottom of an inner cavity of a storage box can save labor force, the device can be carried in high and low positions by the lifter, the labor force is saved, the vibration, firm equipment installation, the rubber pad in the storage tank can further cushion vibrations simultaneously, and the shock attenuation is effectual, but the device does not install any structure that can carry out the subregion illumination above that, and the illuminating effect is not good, can't throw light on to specific area, needs to carry out certain improvement.

Disclosure of Invention

The invention aims to: the tunnel construction conveying equipment capable of conducting subarea illumination is provided for solving the problems that a traditional tunnel construction conveying device is not provided with any structure capable of conducting subarea illumination, the illumination effect is poor, and illumination for a specific area cannot be conducted.

In order to achieve the purpose, the invention adopts the following technical scheme: the tunnel construction carrying equipment capable of carrying out regional illumination comprises a vehicle head, a regional lamp shade, a carrying plate, a toothed plate and a top plate assembly, wherein a driving motor and an illuminating lamp are fixedly installed at the top of the vehicle head, a driving gear is fixedly installed at one end of an output shaft of the driving motor through a rotating shaft, the regional lamp shade is rotatably installed at the top of the vehicle head, a connecting shaft is rotatably installed at the bottom of the regional lamp shade through an installing support, a transmission bevel gear is fixedly installed at one end of the connecting shaft, a transmission gear and a driven gear are rotatably installed in a side shell cavity of the vehicle head through a middle rotating shaft, a driven bevel gear is fixedly installed at one end of the middle rotating shaft of the transmission gear, the transmission bevel gear and the driven bevel gear are mutually meshed and connected, a dust hood is fixedly installed outside the middle rotating shaft of the driven gear, a main motor is, a carrying plate is slidably mounted on one side of the vehicle head, a toothed plate is fixedly mounted on the side wall of the carrying plate, the lifting gear is meshed with the toothed plate and connected with the toothed plate, and a bottom plate is fixedly mounted on the inner wall of the bottom surface of the vehicle head.

As a further description of the above technical solution:

the subregion lamp shade comprises housing, interior cleaning pad and first outer top spring, the outside fixed mounting of housing has rotatory outer muscle and driven tooth cover, drive gear is connected with driven tooth cover intermeshing.

As a further description of the above technical solution:

light-transmitting opening has been seted up to the inside of housing, fixed mounting's bottom guide rail slidable mounting has the regulation cover door in the light-transmitting opening, fixed mounting has first outer top spring on the inner wall of housing, clean pad in the one end fixed mounting of first outer top spring.

As a further description of the above technical solution:

an impurity removing plate is obliquely and fixedly arranged in the vehicle head below the dust hood, and a chip removing port is formed in one side of the impurity removing plate, which is positioned on the side wall of the vehicle head.

As a further description of the above technical solution:

the outer wall of one side of the vehicle head is fixedly provided with a base, the bottom of the base is fixedly provided with a bottom wheel, the top surface of the base is fixedly provided with a supporting spring, and the bottom surface of the carrying plate is provided with a bottom groove.

As a further description of the above technical solution:

the top surface of the carrying plate is provided with a top sliding groove, the outer side of the top sliding groove is arranged on the top surface of the carrying plate and is provided with an anti-slip pad, the inner wall of the top sliding groove is fixedly provided with an inner guide rail, the inner guide rail is provided with a sliding block in a sliding manner, and the top of the sliding block is fixedly provided with a side stabilizing plate.

As a further description of the above technical solution:

the inside fixed mounting of top spout has the roof subassembly, and the roof subassembly comprises shell, outer apical axis, spacing axle and the outer top spring of third, the inside fixed mounting of shell has the outer top spring of second.

As a further description of the above technical solution:

the inner sliding installation of the shell is provided with an outer jacking shaft, one end of the second outer jacking spring is fixedly connected with one end of the outer jacking shaft, an installation inner groove is formed in the outer jacking shaft, and a third outer jacking spring is fixedly installed in the installation inner groove.

As a further description of the above technical solution:

the inside slidable mounting of installation inside groove has spacing axle, the one end of third outer top spring and the one end fixed connection of spacing axle, spacing axle one end is passed and is extended to the outside of shell.

As a further description of the above technical solution:

a side plate is fixedly mounted on the outer wall of one side of the vehicle head, an extrusion head is fixedly mounted at the bottom of the side plate, and the extrusion head is located right above the limiting shaft.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. in the invention, the side stabilizing plate which is automatically popped up is arranged on the top of the carrying plate, when an object is carried, the carrying plate of the device can be driven to move to the lower part of the bottom groove at the bottom of the object, at the moment, the external main motor is started, the main motor can drive the lifting gear to rotate, the lifting gear can drive the carrying plate with the toothed plate to lift, thereby realizing the lifting and carrying of the object, at the floor lifting in-process, the extrusion head of the outside curb plate bottom of device can produce the extrusion to the spacing axle of roof subassembly, makes it get into the installation inside groove of outer apical axis, and outer apical axis loses the confining force this moment, and the outer apical axis of second spring can be ejecting automatically, and the firm board displacement of automatic drive side carries out the side direction to the object automatically and fixes, and design benefit has realized the stable effect to the quick side direction in the object handling, has improved the stability of transport.

2. According to the invention, the rotatable partition lampshade is arranged on the partition lampshade, the controllable adjusting cover door is arranged in the partition lampshade, when a common device needs to be used for illumination, the position of the adjusting cover door can be adjusted according to needs, the area of a light-emitting illumination area is controlled, when the partition illumination needs to be carried out, only the driving motor is required to be started, the driving gear is driven by the driving motor to rotate, the partition lampshade with the driven gear sleeve can be driven to rotate, the position area of the light-transmitting opening is changed, the illumination area is changed, the using effect is good, the convenience and the rapidness are realized, meanwhile, the inner cleaning pad with the first outer top spring is arranged in the housing, the inner cleaning pad generates relative friction with the illuminating lamp when the illuminating lamp rotates, the effective cleaning effect on the outside of the illuminating lamp can be.

3. According to the invention, the rotatable dust hood is arranged in the device, when the lamp shade rotates the cleaning pad to clean the illuminating lamp, the lamp shade can simultaneously drive the transmission bevel gear at the bottom of the lamp shade to rotate, the transmission gear with the driven bevel gear can be driven to rotate, the transmission gear can drive the dust hood with the driven gear to rotate, the dust hood can effectively adsorb dust cleaned by the illuminating lamp through the rotating subarea lamp shade, the dust hood has a good adsorption effect, meanwhile, the inclined impurity removing plate is arranged in the device, and some granular impurities can be discharged through the impurity removing port.

Drawings

Fig. 1 is a front view of a tunnel construction handling apparatus capable of zone illumination.

Fig. 2 is a schematic view of the internal structure of a head of the tunnel construction handling equipment capable of performing zone illumination.

Fig. 3 is an enlarged schematic perspective view of a sectional lampshade in the tunnel construction handling equipment capable of performing sectional illumination.

Fig. 4 is a plan view of a conveyance plate in the tunnel construction conveyance equipment capable of zone illumination.

Fig. 5 is an enlarged schematic configuration diagram at a in the tunnel construction handling equipment capable of zone illumination.

Fig. 6 is an enlarged schematic configuration diagram of a tunnel construction handling equipment B capable of zone illumination.

Figure 7 is an enlarged partial cross-sectional side view of a roof assembly in a tunnel construction handling apparatus capable of zoned illumination.

Illustration of the drawings:

1. a headstock; 2. a drive motor; 3. an illuminating lamp; 4. partitioning the lampshade; 41. a housing; 42. adjusting the cover door; 43. rotating the outer ribs; 44. an inner cleaning pad; 45. a first outer top spring; 46. a bottom rail; 47. a light-transmitting opening; 5. a side stabilizing plate; 6. a side plate; 7. an extrusion head; 8. a bottom wheel; 9. a base; 10. a carrying plate; 11. a support spring; 12. a bottom groove; 13. a driven gear sleeve; 14. a transmission gear; 15. a drive bevel gear; 16. a driven bevel gear; 17. a driven gear; 18. a drive gear; 19. a dust hood; 20. a trash removal plate; 21. a chip removal port; 22. a toothed plate; 23. lifting the gear; 24. a base plate; 25. a top chute; 26. a non-slip mat; 27. a top plate assembly; 271. a housing; 272. a second outer top spring; 273. an outer top shaft; 274. a limiting shaft; 275. installing an inner groove; 276. a third outer top spring; 28. an inner guide rail; 29. a slide block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: tunnel construction carrying equipment capable of conducting partition illumination comprises a locomotive 1, a partition lampshade 4, a carrying plate 10, a toothed plate 22 and a top plate assembly 27, wherein a driving motor 2 and a lighting lamp 3 are fixedly mounted at the top of the locomotive 1, a driving gear 18 is fixedly mounted at one end of an output shaft of the driving motor 2 through a rotating shaft, the partition lampshade 4 is rotatably mounted at the top of the locomotive 1, a connecting shaft is rotatably mounted at the bottom of the partition lampshade 4 through a mounting support, a transmission bevel gear 15 is fixedly mounted at one end of the connecting shaft, the partition lampshade 4 comprises a housing 41, an inner cleaning pad 44 and a first outer top spring 45, a rotary outer rib 43 and a driven toothed sleeve 13 are fixedly mounted outside the housing 41, the driving gear 18 is in meshed connection with the driven toothed sleeve 13, a light transmitting opening 47 is formed in the housing 41, and an adjusting cover door 42 is slidably mounted on a bottom guide rail 46 fixedly mounted in the light transmitting opening, the inner wall of the housing 41 is fixedly provided with a first outer top spring 45, one end of the first outer top spring 45 is fixedly provided with an inner cleaning pad 44, the partition lampshade 4 is installed, the partition lampshade 4 consists of the housing 41, the inner cleaning pad 44 and the first outer top spring 45, when a common use device needs to illuminate, the position of the adjusting housing door 42 can be adjusted according to needs, the area of a light-emitting illumination area is controlled, when partition illumination needs to be carried out, only the driving motor 2 needs to be started, the driving motor 2 drives the driving gear 18 to rotate, the partition lampshade 4 with the driven gear sleeve 13 can be driven to rotate, the position area of the light-transmitting opening is changed, the illumination area is changed, the use effect is good, convenience and rapidness are achieved, the inner cleaning pad 44 inside the partition lampshade 4 rubs against the illuminating lamp when the illuminating lamp rotates, and an effective cleaning effect on the outside the illuminating lamp 3 can be achieved, the multifunctional cleaning device has the advantages that the function is strong, the cleaning effect is good, when the housing 41 rotates the inner cleaning pad 44 to clean the illuminating lamp 3, the housing 41 can simultaneously drive the transmission bevel gear 15 at the bottom of the housing to rotate, the transmission gear 14 with the driven bevel gear 16 can be driven to rotate, the transmission gear 14 can drive the dust hood 19 with the driven gear 17 to rotate, the dust hood 19 can effectively adsorb dust, cleaned by the illuminating lamp, of the rotating partition lampshade 4, and the adsorption effect is good;

a transmission gear 14 and a driven gear 17 are rotatably mounted in a side shell cavity of the locomotive 1 through a middle rotating shaft, one end of the middle rotating shaft of the transmission gear 14 is fixedly mounted with a driven bevel gear 16, the transmission bevel gear 15 and the driven bevel gear 16 are meshed with each other, a dust hood 19 is fixedly mounted outside the middle rotating shaft of the driven gear 17, an impurity removing plate 20 is obliquely and fixedly mounted below the dust hood 19 and positioned inside the locomotive 1, one side of the impurity removing plate 20 is provided with an impurity removing port 21 on the side wall of the locomotive 1, the impurity removing port 21 is formed by mounting the impurity removing plate 20, and some granular impurities can slide off through the impurity removing plate 20 and finally be discharged through the impurity removing port 21;

the device comprises a headstock 1, a main motor, a lifting gear 23, a base 9, a bottom wheel 8, a supporting spring 11, a bottom groove 12 and a carrying plate 10, wherein the main motor is fixedly installed on the outer wall of the rear side of the headstock 1, the lifting gear 23 is rotatably installed at one end of an output shaft of the main motor through a rotating shaft, the base 9 is fixedly installed on the outer wall of one side of the headstock 1, the bottom of the base 9 is fixedly provided with the bottom wheel 8, the supporting spring 11 is fixedly installed on the top surface of the base 9, the bottom groove 12 is formed in the bottom surface of the carrying plate 10, the device;

a carrying plate 10 is slidably mounted on one side of the locomotive 1, a toothed plate 22 is fixedly mounted on the side wall of the carrying plate 10, the lifting gear 23 is meshed with the toothed plate 22 and connected with the toothed plate 22, a bottom plate 24 is fixedly mounted on the inner wall of the bottom surface of the locomotive 1, a top sliding groove 25 is formed in the top surface of the carrying plate 10, a non-slip mat 26 is arranged on the top surface of the carrying plate 10 at the outer side of the top sliding groove 25, an inner guide rail 28 is fixedly mounted on the inner wall of the top sliding groove 25, a sliding block 29 is slidably mounted on the inner guide rail 28, a side stabilizing plate 5 is fixedly mounted on the top of the sliding block 29, a top plate assembly 27 is fixedly mounted in the top sliding groove 25, the top plate assembly 27 is composed of a shell 271, an outer top shaft 273, a limiting shaft 274 and a third outer top spring 276, a second outer top spring 272 is fixedly mounted in the shell 271, an outer top shaft 273 is slidably mounted in the shell 271, one, an inner mounting groove 275 is formed in the inner top shaft 273, a third outer top spring 276 is fixedly mounted in the inner mounting groove 275, a limiting shaft 274 is slidably mounted in the inner mounting groove 275, one end of the third outer top spring 276 is fixedly connected with one end of the limiting shaft 274, one end of the limiting shaft 274 penetrates through and extends to the outer side of the outer shell 271, a top plate assembly 27 is mounted, the top plate assembly 27 is composed of the outer shell 271, the outer top shaft 273, the limiting shaft 274 and the third outer top spring 276, when an object is conveyed, the conveying plate 10 of the device can be driven to move to the position below a bottom groove at the bottom of the object, an external main motor is started at the moment, the main motor can drive the lifting gear 23 to rotate, the lifting gear 23 can drive the conveying plate 10 with the toothed plate 22 to lift, so that the object can be lifted and conveyed, and in the lifting process of the conveying plate 10, extrusion head 7 of the outside curb plate 6 bottom of device can produce the extrusion to roof subassembly 27 spacing axle 274, make it get into in the installation inside groove 275 of outer apical axis 273, outer apical axis 273 loses the confining force this moment, the outer apical axis 273 of second can be ejecting automatically, the steady board 5 displacement of automatic drive side, it is fixed to carry out the side direction to the object automatically, design benefit has realized the stable effect of quick side direction to the object handling in-process, the stability of transport has been improved.

The working principle is as follows: when an object is carried, the carrying plate 10 of the device can be driven to move to the position below the bottom groove of the bottom of the object, at the moment, an external main motor is started, the main motor can drive the lifting gear 23 to rotate, the lifting gear 23 can drive the carrying plate 10 with the toothed plate 22 to lift, so that the object can be lifted and carried, in the lifting process of the carrying plate 10, the extrusion head 7 at the bottom of the side plate 6 outside the device can extrude the limiting shaft 274 of the top plate assembly 27 to enter the installation inner groove 275 of the outer top shaft 273, at the moment, the outer top shaft 273 loses limiting force, the second outer top spring 272 can automatically eject the outer top shaft 273, the side stabilizing plate 5 is automatically driven to move, the object is automatically laterally fixed, the design is ingenious, the quick lateral stabilizing effect in the object carrying process is realized, the carrying stability is improved, and when the device is used normally and needs to be illuminated, the position of the adjusting cover door 42 can be adjusted according to the needs, the area of the light-emitting illumination area is controlled, when the subarea illumination is needed, only the driving motor 2 needs to be started, the driving gear 18 is driven by the driving motor 2 to rotate, the subarea lampshade 4 with the driven gear sleeve 13 can be driven to rotate, and the position area of the light-transmitting opening is changed, so that the illumination area is changed, the using effect is good, the convenience and the rapidness are realized, the inner cleaning pad 44 in the subarea lampshade 4 rubs against the illuminating lamp when the illuminating lamp rotates, the effective cleaning effect on the outer part of the illuminating lamp 3 can be realized, when the illuminating lamp 3 is cleaned by rotating the inner cleaning pad 44 by the cover 41, the cover 41 can simultaneously drive the transmission bevel gear 15 at the bottom of the cover to rotate, the transmission gear 14 with the driven bevel gear 16 can be driven, the transmission gear 14 can drive the suction hood 19 with the driven gear 17 to rotate, and the dust under the illumination of the illuminating lamp, has good adsorption effect, and some granular impurities can slide off through the impurity discharging plate 20 and finally be discharged through the chip discharging port 21.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. Tunnel construction haulage equipment that subregion illumination can be carried out, including locomotive (1), subregion lamp shade (4), transport board (10), pinion rack (22) and roof subassembly (27), its characterized in that: a driving motor (2) and a lighting lamp (3) are fixedly mounted at the top of the locomotive (1), one end of an output shaft of the driving motor (2) is fixedly provided with a driving gear (18) through a rotating shaft, the partitioned lampshade (4) is rotatably mounted at the top of the locomotive (1), the bottom of the partitioned lampshade (4) is rotatably mounted with a connecting shaft through a mounting bracket, one end of the connecting shaft is fixedly provided with a transmission bevel gear (15), a side shell cavity of the locomotive (1) is rotatably mounted with a transmission gear (14) and a driven gear (17) through a middle rotating shaft, one end of the middle rotating shaft of the transmission gear (14) is fixedly mounted with a driven bevel gear (16), the transmission bevel gear (15) and the driven bevel gear (16) are mutually engaged and connected, a dust hood (19) is fixedly mounted at the outer part of the middle rotating shaft of the driven gear (17), and a main motor, lifting gear (23) are installed through the pivot rotation to the output shaft one end of main motor, one side slidable mounting of locomotive (1) has transport board (10), and fixed mounting has pinion rack (22) on the lateral wall of transport board (10), lifting gear (23) are connected with pinion rack (22) intermeshing, and fixed mounting has bottom plate (24) on the bottom surface inner wall of locomotive (1).

2. The tunnel construction carrying equipment capable of carrying out the subarea illumination according to claim 1, wherein the subarea lampshade (4) is composed of a cover shell (41), an inner cleaning pad (44) and a first outer top spring (45), a rotary outer rib (43) and a driven gear sleeve (13) are fixedly arranged outside the cover shell (41), and the driving gear (18) and the driven gear sleeve (13) are meshed and connected with each other.

3. The tunnel construction carrying equipment capable of conducting partition illumination according to claim 2, wherein a light transmission opening (47) is formed in the housing (41), an adjusting housing door (42) is slidably mounted on a bottom guide rail (46) fixedly mounted in the light transmission opening (47), a first outer top spring (45) is fixedly mounted on the inner wall of the housing (41), and an inner cleaning pad (44) is fixedly mounted at one end of the first outer top spring (45).

4. The tunnel construction carrying equipment capable of carrying out the subarea lighting according to claim 1, wherein an impurity removing plate (20) is obliquely and fixedly mounted below the dust hood (19) in the vehicle head (1), and one side of the impurity removing plate (20) is provided with a chip removing port (21) on the side wall of the vehicle head (1).

5. The tunnel construction carrying equipment capable of carrying out the subarea illumination according to claim 1, wherein a base (9) is fixedly installed on the outer wall of one side of the vehicle head (1), bottom wheels (8) are fixedly installed at the bottom of the base (9), supporting springs (11) are fixedly installed on the top surface of the base (9), and a bottom groove (12) is formed in the bottom surface of the carrying plate (10).

6. The tunnel construction carrying equipment capable of carrying out subarea illumination according to claim 5, wherein the top surface of the carrying plate (10) is provided with a top sliding groove (25), the outer side of the top sliding groove (25) is provided with a non-slip mat (26) on the top surface of the carrying plate (10), the inner wall of the top sliding groove (25) is fixedly provided with an inner guide rail (28), the inner guide rail (28) is provided with a sliding block (29) in a sliding manner, and the top of the sliding block (29) is fixedly provided with a side stabilizing plate (5).

7. The tunnel construction handling equipment capable of carrying out the subarea illumination according to claim 6, wherein a top plate assembly (27) is fixedly mounted inside the top chute (25), the top plate assembly (27) is composed of a housing (271), an outer top shaft (273), a limiting shaft (274) and a third outer top spring (276), and a second outer top spring (272) is fixedly mounted inside the housing (271).

8. The tunnel construction conveying equipment capable of performing subarea illumination according to claim 7, wherein an outer top shaft (273) is slidably mounted inside the housing (271), one end of the second outer top spring (272) is fixedly connected with one end of the outer top shaft (273), an inner mounting groove (275) is formed inside the outer top shaft (273), and a third outer top spring (276) is fixedly mounted inside the inner mounting groove (275).

9. The apparatus of claim 8, wherein a limit shaft (274) is slidably installed inside the installation inner groove (275), one end of the third outer top spring (276) is fixedly connected to one end of the limit shaft (274), and one end of the limit shaft (274) passes through and extends to the outside of the housing (271).

10. The tunnel construction handling equipment capable of carrying out regional illumination according to claim 9, wherein a side plate (6) is fixedly mounted on the outer wall of one side of the vehicle head (1), an extrusion head (7) is fixedly mounted at the bottom of the side plate (6), and the extrusion head (7) is positioned right above the limiting shaft (274).