Furniture edge banding equipment

Abstract

A furniture edge banding device includes a work surface, on which a guide groove, a reverse wheel, a forward wheel and an extrusion roller are installed. The guide groove is located at one end of the work surface, and the forward wheel and the extrusion roller are located at the other end of the work surface, close to the position of the furniture to be edge banded. A gap for placing an edge banding strip is left between the forward wheel and the extrusion roller. A reverse wheel is arranged between the guide groove and the extrusion roller. After the edge banding strip comes out of the guide groove, it bypasses the outer edge of the reverse wheel and is then inserted into the gap between the forward wheel and the extrusion roller. A main shaft is passed through the middle of the extrusion roller, and the main shaft is connected to a motor. The reverse wheel and the forward wheel can rotate freely around their axis direction. The furniture edge banding device can realize operations such as tensioning and compacting the sealing strip. A person only needs to hold the furniture to be edge banded, which saves manpower and greatly improves efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of furniture edge sealing, and in particular to a furniture edge sealing device. Background Art

[0002] The sealing strip of panel furniture generally includes an exposed part and an embedded part. A groove is provided on the outer circle of the panel furniture. When the sealing strip is used, its embedded part is embedded into the groove of the outer circle of the panel furniture, and the exposed part is exposed on the outer side of the panel furniture. However, the sealing strips in the furniture industry are generally installed manually. First, the embedded part of one end of the sealing strip is inserted into the groove of the outer circle of the panel furniture, and then the remaining sealing strip is forced into the groove by hand. This method has extremely high requirements for the operator. When pressing by hand, it must not be pressed sideways, otherwise the exposed part of the sealing strip will be uneven. Moreover, manual operation often encounters the situation where the sealing strip is stuck. For example, the size of the embedded part of the sealing strip and the groove is too small, and it cannot be pressed in by hand. It is necessary to use tools such as a wooden hammer to knock it in hard, which will also cause the exposed part of the sealing strip to be unsightly. This is especially obvious when installing sealing strips with inward bends at both ends. When installing sealing strips with inward bends at both ends, the inner bends at both ends often overlap the outside of the furniture. Tools are needed to dig out the inner bends, and then manually place the inner bends on the outside of the furniture, and then use hammers and other tools to fix them on the outside of the furniture. Currently, there is no automatic equipment on the market for edge sealing of furniture panels, especially automated equipment for installing sealing strips with inward bends at both ends. Summary of the invention

[0003] In order to solve the above-mentioned problem that the manual installation of sealing strips of panel furniture is difficult and unsightly, the present invention provides a furniture edge sealing device, which can realize operations such as tensioning and compacting the sealing strips. Manual workers only need to hold the furniture to be edge sealed, which saves manpower and greatly improves efficiency.

[0004] The technical solution of the present invention is as follows:

[0005] A furniture edge banding device comprises a work surface, on which a guide groove, a reverse wheel, a forward wheel and an extrusion roller are installed. The guide groove is located at one end of the work surface and is used to transmit a sealing strip. The forward wheel and the extrusion roller are located at the other end of the work surface, close to the position of the furniture to be edge banded, and the extrusion roller is closer to the outside than the forward wheel, so as to facilitate contact with the furniture to be edge banded. A gap for placing the edge banding strip is left between the forward wheel and the extrusion roller. A reverse wheel is arranged between the guide groove and the extrusion roller. After the edge banding strip comes out of the guide groove, it bypasses the outer edge of the reverse wheel and is inserted into the gap between the forward wheel and the extrusion roller after changing direction. A main shaft is passed through the middle of the extrusion roller, and the main shaft is connected to a motor. The reverse wheel and the forward wheel can rotate freely around their axis directions. Under the rotation of the main shaft, the edge banding strip passes through the reverse wheel and the forward wheel successively, so that the edge banding strip is in a tensioned state, and then is extruded from between the forward wheel and the extrusion roller and pressed into the outside of the furniture to be edge banded.

[0006] Furthermore, the reverse wheel and the forward wheel are provided with inner grooves at middle positions, and during the conveying process, the embedded parts of the edge banding strip are inserted into the inner grooves of the reverse wheel and the forward wheel.

[0007] The edge banding strip used in the furniture edge banding device as described above includes an outer arc portion and a plug, the plug is perpendicular to the outer arc portion, and the length of the plug is less than the depth of the grooves in the reverse wheel and the forward wheel.

[0008] Preferably, C-shaped hooks are provided on both sides of the outer arc portion, and the ends of the C-shaped hooks face the plug. By providing C-shaped hooks at both ends of the edge banding strip, the edge banding strip fits more closely with the outer ring of the furniture compared to a flat edge banding strip, thereby improving the aesthetics of the edge banding strip.

[0009] In the furniture edge banding device as described above, a C-divider is further provided between the guide groove and the reverse wheel, which can perform an outward expansion action on the C-shaped hooks at both ends of the edge banding strip in advance. The C-divider includes a support seat and an extrusion seat, the axes of the support seat and the extrusion seat are parallel to each other, and can rotate freely on the work surface around their respective axis directions, the outer end surface of the support seat is an outward convex C-shape, and the outer end surface of the extrusion seat is an inward concave C-shape, the gap between the support seat and the extrusion seat matches the thickness of the outer arc portion of the edge banding strip, and the outer end of the support seat is provided with an inner groove in a direction perpendicular to the axis, and the depth of the inner groove is greater than the length of the plug. When in use, the plug of the edge banding strip extends into the inner groove of the support seat, and the C-shaped hooks at both ends are squeezed by the extrusion seat to extend to both sides and stick to the outer end surface of the support seat. Through the advance expansion action of the C-divider on the C-shaped hooks at both ends of the C-shaped edge banding strip, the C-shaped hooks at both ends can have a certain outward extension angle after the edge banding strip passes through the direction wheel and the forward wheel, which is convenient for fitting with the outer edge of the furniture.

[0010] Furthermore, the inner groove in the middle of the reverse wheel has columnar structures on both sides, and the C-shaped hooks unfolded at both ends of the edge banding strip can further lie on the reverse wheel, which not only increases the unfolding angle of the C-shaped hooks, but also can further extend the unfolding effect.

[0011] Preferably, the angle formed by the edge banding strips on both sides of the reverse wheel is less than 150 degrees, so that the edge banding strip is always in a tensioned state, so as to facilitate maintaining the unfolded state of the C-shaped hook of the edge banding strip.

[0012] In the furniture edge banding device as described above, the two sides of the inner groove of the support seat are working surfaces, the outer side of the working surface is the outer end surface, and the angle between the working surface and the axis of the support seat is smaller than the angle between the outer end surface and the axis of the support seat, which can increase the expansion angle of the C-shaped hook of the edge banding strip.

[0013] Furthermore, the shape of the outer end surface of the extrusion seat matches the shape of the outer end surface of the support seat.

[0014] In the furniture edge banding equipment as described above, both sides of the inner groove of the forward wheel are provided with inwardly inclined working surfaces. After the edge banding strip passes through the forward wheel and the extrusion roller, it changes direction again to prepare to contact the furniture. At this time, the plunger of the edge banding strip is inserted into the inner groove of the forward wheel, and the two sides of the plunger are opened outward at a certain angle under the action of the inclined surface. Since the extrusion roller is closer to the outside than the forward wheel, after the edge banding strip is completely separated from the forward wheel, the edge banding strip contacts the furniture after a short period of retraction, so that the two ends of the edge banding strip can better fit on the front and back surfaces of the furniture. No manual adjustment is required, which is beautiful and practical.

[0015] In the furniture edge banding equipment as described above, the extrusion roller includes an extrusion barrel and a height adjustment part. The extrusion barrel is located below the height adjustment part, and the height of its cylindrical barrel is greater than the height of the forward wheel. When edge banding, the edge banding strip is put on the outside of the furniture, and then squeezed onto the extrusion barrel, and moved together with the rotation of the extrusion roller. The height adjustment part can be used to adjust the height of the extrusion barrel. When using a wider edge banding strip, the forward wheel and reverse wheel of the corresponding size can be replaced, and the height of the extrusion barrel can be raised by rotating the height adjustment part.

[0016] The beneficial effects achieved by the present invention compared with the prior art are:

[0017] 1. The furniture edge banding equipment of the present invention keeps the edge banding strip in a tensioned state all the time and both sides remain in an extended state through the design of the reverse wheel and the forward wheel, so that operations such as tensioning and compacting the edge banding strip can be easily realized. After the edge banding strip changes direction twice through the reverse wheel and the forward wheel, it is rotated along the extrusion roller to fit the furniture. Workers only need to hold the furniture to be edge banded, which saves manpower and greatly improves efficiency.

[0018] 2. The furniture edge banding equipment of the present invention can advance the expansion of the C-shaped hooks at both ends of the C-shaped edge banding strip by using a C-divider in front of the reverse wheel, so that after the edge banding strip passes through the direction wheel and the forward wheel, the C-shaped hooks at both ends have a certain outward extension angle, which is convenient for fitting with the outer edge of the furniture.

[0019] 3. The furniture edge banding equipment of the present invention has a step-by-step increase in the contact angle between the support seat, the reverse wheel and the forward wheel and the inner end face of the edge banding strip, which can gradually increase the expansion angle of the outer arc of the edge banding strip and the C-shaped hooks at both ends. Such a step-by-step approach is conducive to the edge banding strip not to retract quickly after expansion. After the edge banding strip is completely separated from the forward wheel, the edge banding strip will contact the furniture after a short period of retraction, which can make the two ends of the edge banding strip better fit on the front and back surfaces of the furniture. No manual adjustment is required, which is beautiful and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0021] In the attached picture:

[0022] Figure 1 This is a diagram showing the use status of the furniture edge banding device in Example 1;

[0023] Figure 2 This is a diagram showing the combined use of the forward wheel and the squeeze roller in Example 1;

[0024] Figure 3 It is a schematic structural diagram of the forward wheel in Example 1;

[0025] Figure 4 It is a schematic diagram of the structure of the reverse wheel in Example 1;

[0026] Figure 5 Embodiment 1 is a schematic diagram of the structure of the edge banding strip;

[0027] Figure 6 This is a diagram showing the use status of the furniture edge banding device in Example 2;

[0028] Figure 7 Schematic diagram of the structure of the C-split device in Example 2, wherein (a) is a front view and (b) is a top view;

[0029] Figure 8 This is a state diagram of the edge banding strip passing through the C-split device in Example 2;

[0030] The components represented by the reference numerals in the figure are:

[0031] 1. Work table, 2. Guide groove, 3. Reverse wheel, 4. Forward wheel, 41. First working surface, 42. First outer end surface, 5. Extrusion roller, 51. Extrusion cylinder, 52. Height adjuster, 6. Spindle, 7. C divider, 71. Support seat, 711. Second working surface, 712. Second outer end surface, 72. Extrusion seat, 721. Third working surface, 722. Third outer end surface, 8. Edge banding. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below in conjunction with the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure can be implemented in various forms and should not be limited by the embodiments described herein.

[0033] The directions "front and back", "left and right", etc. mentioned in the present invention are only used to express relative positional relationships and are not restricted by any specific direction reference in practical applications.

[0034] Example 1

[0035] See also Figure 1 , Figure 1 This is a diagram of the use state of a furniture edge banding device of the present embodiment 1, comprising a work surface 1, on which a guide groove 2, a reverse wheel 3, a forward wheel 4 and an extrusion roller 5 are installed. The guide groove 2 is located at one end of the work surface 1 and is used to transmit the edge banding strip 8. The forward wheel 4 and the extrusion roller 5 are located at the other end of the work surface 1, close to the position of the furniture to be edge banded, and the extrusion roller 5 is closer to the outside than the forward wheel 4, which is convenient for contact with the furniture to be edge banded. A gap is left between the forward wheel 4 and the extrusion roller 5 for placing the edge banding strip 8. A reverse wheel 3 is arranged between the guide groove 2 and the extrusion roller 5. After the edge banding strip 8 comes out of the guide groove 2, it bypasses the outer edge of the reverse wheel 3, and after changing direction, it is inserted into the gap between the forward wheel 4 and the extrusion roller 5, and passes out after changing direction again. A main shaft 6 is passed through the middle of the extrusion roller 5, and the main shaft 6 is connected to components such as a motor and a reducer, and the speed, direction and other parameters of the main shaft 6 can be controlled by a control component.

[0036] Further, the structures of the reverse wheel 3 and the forward wheel 4 refer to Figure 3 and Figure 4 As shown, a countersunk hole is provided at the upper end, and a rotating shaft is installed in the countersunk hole, and the reverse wheel 3 and the forward wheel 4 can rotate freely around their axis directions. Under the rotation of the main shaft 6, the edge banding strip 8 passes through the reverse wheel 3 and the forward wheel 4 successively, so that the edge banding strip 8 is in a tensioned state, and then squeezed out from between the forward wheel 4 and the squeezing roller 5, and pressed into the outer side of the furniture to be edge-sealed.

[0037] Furthermore, the reverse wheel 3 and the forward wheel 4 are provided with inner grooves at the middle positions, and the embedded parts of the edge banding strip 8 are inserted into the inner grooves of the reverse wheel 3 and the forward wheel 4 during the conveying process.

[0038] Further, the structure of the edge banding strip 8 can be seen in Figure 5 As shown, it includes an outer arc portion 81 and a plug 82, wherein the plug 82 is perpendicular to the outer arc portion 81, and the length of the plug 82 is less than the depth of the grooves in the reverse wheel 3 and the forward wheel 4. Preferably, the plug 82 includes a plurality of inverted teeth to prevent it from falling off from the furniture.

[0039] Preferably, C-shaped hooks 83 are further provided on both sides of the outer arc portion 81, and the ends of the C-shaped hooks 83 face the plug 82. By providing C-shaped hooks 83 at both ends of the edge banding strip 8, the edge banding strip 8 can be more closely fitted to the outer ring of the furniture compared to a flat edge banding strip, thereby improving the aesthetics of the edge banding strip 8.

[0040] See below Figure 4 The inner groove in the middle of the reverse wheel 3 has columnar structures on both sides, and the C-shaped hooks 83 at both ends of the edge banding 8 can be unfolded and lie on the reverse wheel 3. Partially unfolding the C-shaped hooks 83 of the edge banding in advance will facilitate the fitting of the subsequent edge banding and the furniture, and prevent the C-shaped hooks 83 from being superimposed and squeezed on the side of the furniture.

[0041] See also Figure 3 , the first working surfaces 41 inclined inward are provided on both sides of the inner groove of the forward wheel 4, and the outer side of the first working surface 41 is a cylindrical first outer end surface 42. After the edge banding strip 8 passes through the forward wheel 4 and the squeezing roller 5, it will change direction again to prepare to contact the furniture. At this time, the plug 82 of the edge banding strip 8 is inserted into the inner groove of the forward wheel 4, and the two sides of the plug 82 will open outward at a certain angle due to the shape of the first working surface 41. Since the squeezing roller 5 is closer to the outside than the forward wheel 4, after the edge banding strip 8 is completely separated from the forward wheel 4, the edge banding strip 8 will contact the furniture after a short period of retraction, so that the two ends of the edge banding strip 8 can better fit on the front and back surfaces of the furniture. No manual adjustment is required, which is beautiful and practical.

[0042] Preferably, the vertical height of the first working surface 41 on both sides of the inner groove of the forward wheel 4 is slightly smaller than the distance between the inner roots of the C-shaped hooks 83 on both sides of the edge banding strip 8, so that the two C-shaped hooks 83 can lie on the first outer end surface 42 after passing through the forward wheel 4, so that the C-shaped hooks 83 are always in an extended state, which is convenient for subsequent fitting with the furniture.

[0043] See also Figure 2 The squeezing roller 5 includes an squeezing barrel 51 and a height adjustment part 52. The squeezing barrel 51 is located below the height adjustment part 52. The height of the cylindrical barrel is greater than the height of the forward wheel 4, which facilitates the close proximity of the forward wheel 4 and the squeezing barrel 51. When edge banding, the edge banding strip 8 is put on the outer side of the furniture, and then squeezed onto the squeezing barrel 51, and moved together with the rotation of the squeezing roller 5. The height adjustment part 52 can be used to adjust the height of the squeezing barrel 51. When using a wider edge banding strip 8, the forward wheel 4 and the reverse wheel 3 of the corresponding size can be replaced, and the height of the squeezing barrel 51 can be raised by rotating the height adjustment part 52.

[0044] See also Figure 1 In this embodiment, the plug 82 of the edge banding 8 is located on the left side, and the rotation direction of the main shaft 6 in the squeezing roller 5 is counterclockwise. The reverse wheel 3 and the forward wheel 4 deviate at a certain angle, so that the edge banding 8 is always in a tensioned state, and the C-shaped hooks 83 on both sides remain in an extended state. After the reverse wheel 3 and the forward wheel 4 change directions twice, the edge banding 8 rotates along the squeezing roller 5 to fit the furniture. The manual operation only needs to hold the furniture to be edge banded, which saves manpower and greatly improves efficiency.

[0045] Example 2

[0046] See also Figure 6 In order to better separate the C-shaped hooks 83 on both sides of the edge banding strip 8, a C-divider 7 is further provided between the guide groove 2 and the reverse wheel 3, so that the C-shaped hooks 83 on both ends of the edge banding strip 8 can be expanded outward in advance.

[0047] Combine the following Figure 7 The C-divider 7 includes a support seat 71 and an extrusion seat 72. Countersunk holes are provided on the support seat 71 and the extrusion seat 72, and a rotating shaft is passed through the inside. The axes of the rotating shafts are parallel to each other and can rotate freely on the work table 1 around their respective axis directions. The outer end surface of the support seat 71 is a convex C-shape, and the outer end surface of the extrusion seat 72 is a concave C-shape. The gap between the support seat 71 and the extrusion seat 72 matches the thickness of the outer arc portion 81 of the edge banding strip 8. An inner groove is provided in the middle position of the outer end of the support seat 71 along the direction perpendicular to the axis, and the depth of the inner groove is greater than the length of the plug 82.

[0048] See also Figure 8 When in use, the plug 82 of the edge banding strip 8 extends into the inner groove of the support seat 71, and the C-shaped hooks 83 at both ends are squeezed by the squeezing seat 72 to extend to both sides and stick to the outer end surface of the support seat 71. Through the early expansion of the C-shaped hooks 83 at both ends of the C-shaped edge banding strip 8 by the C-divider 7, the C-shaped hooks 83 at both ends can have a certain outward extension angle after the edge banding strip 8 passes through the direction wheel and the forward wheel 4, so as to facilitate the fit with the outer edge of the furniture.

[0049] Furthermore, the inner groove of the support seat 71 has two sides with second working surfaces 711, the outer side of the second working surface 711 is a second outer end surface 712, and the angle between the second working surface 711 and the axis of the support seat 71 is smaller than the angle between the second outer end surface 712 and the axis of the support seat 71. In this way, the expansion angle of the C-shaped hook 83 of the edge banding strip 8 can be increased.

[0050] Furthermore, the vertical height of the second working surface 711 on both sides of the inner groove of the support seat 71 is slightly smaller than the distance between the inner roots of the C-shaped hooks 83 on both sides of the edge banding strip 8, so that the two C-shaped hooks 83 can lie on the second outer end surface 712 when passing through the C-divider 7, so that the C-shaped hooks 83 are always in an extended state, which is convenient for subsequent fitting with the furniture.

[0051] Furthermore, the shape of the outer end surface of the extrusion seat 72 matches the shape of the outer end surface of the support seat 71. The inner groove is also provided with a third working surface 721 on both sides, and a third outer end surface 722 is provided on both sides of the third working surface 721.

[0052] Furthermore, the C-shaped hooks 83 at both ends of the edge banding strip 8 are unfolded to a certain extent after passing through the C-divider 7, and can then be further placed on the reverse wheel 3. Both ends of the inner groove of the direction wheel 3 are columnar structures, which can not only increase the unfolding angle of the C-shaped hook 83, but also further extend the unfolding effect.

[0053] Preferably, the angle formed by the edge banding strips 8 on both sides of the reverse wheel 3 is less than 150 degrees, so that the edge banding strips 8 are always in a tensioned state, so as to maintain the expanded state of the C-shaped hooks 83 at both ends of the edge banding strips.

[0054] In this embodiment, the contact angles of the support seat 71, the reverse wheel 3 and the forward wheel 4 with the inner end surface of the edge band 8 are increased in a stepwise manner, so that the expansion angles of the outer arc portion 81 of the edge band 8 and the C-shaped hooks 83 at both ends can be gradually increased. Such a step-by-step approach is conducive to the edge band 8 not retracting quickly after expansion. After the edge band 8 is completely separated from the forward wheel, the edge band contacts the furniture after a short period of retraction, so that the two ends of the edge band 8 can be better fitted on the front and back surfaces of the furniture. No manual adjustment is required, which is beautiful and practical.

[0055] Other features not mentioned in this embodiment are the same as those in Embodiment 1 and will not be described in detail.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or additions, subtractions or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A furniture edge banding device, characterized in that: The invention comprises a work surface (1), on which a guide groove (2), a reverse wheel (3), a forward wheel (4) and a squeeze roller (5) are installed. The guide groove (2) is located at one end of the work surface (1), and the forward wheel (4) and the squeeze roller (5) are located at the other end of the work surface (1), close to the position of the furniture to be edge-sealed. A gap for placing an edge banding strip (8) is reserved between the forward wheel (4) and the squeeze roller (5). A reverse wheel (3) is arranged between the guide groove (2) and the squeeze roller (5). After the edge banding strip (8) comes out of the guide groove (2), it bypasses the outer edge of the reverse wheel (3) and is then inserted into the gap between the forward wheel (4) and the squeeze roller (5). A main shaft (6) is passed through the middle of the squeeze roller (5), and the main shaft (6) is connected to a motor. The reverse wheel (3) and the forward wheel (4) can rotate freely around their axis directions. The reverse wheel (3) and the forward wheel (4) are provided with an inner groove at the middle position, the inner groove of the forward wheel (4) is provided with inwardly inclined working surfaces on both sides, and the inner groove in the middle of the reverse wheel (3) is provided with columnar structures on both sides.

2. A furniture edge banding device according to claim 1, characterized in that: The edge banding strip (8) comprises an outer arc portion (81) and a plug (82), wherein the plug (82) is perpendicular to the outer arc portion (81), and the length of the plug (82) is less than the depth of the inner grooves of the reverse wheel (3) and the forward wheel (4).

3. The furniture edge banding device according to claim 2, characterized in that: C-shaped hooks (83) are also provided on both sides of the outer arc portion (81), and the ends of the C-shaped hooks (83) face the plug (82).

4. The furniture edge banding device according to claim 3, characterized in that: A C-divider (7) is also provided between the guide groove (2) and the reverse wheel (3), and the C-divider (7) comprises a support seat (71) and an extrusion seat (72). The support seat (71) and the extrusion seat (72) can freely rotate on the work surface (1) around their axis directions, the outer end surface of the support seat (71) is an outwardly convex C-shape, and the outer end surface of the extrusion seat (72) is an inwardly concave C-shape. The gap between the support seat (71) and the extrusion seat (72) matches the thickness of the outer arc portion (81) of the edge banding strip (8), and the outer end of the support seat (71) is provided with an inner groove in a direction perpendicular to the axis, and the depth of the inner groove is greater than the length of the plug (82).

5. The furniture edge banding device according to claim 4, characterized in that: The angle formed by the edge banding strips (8) on both sides of the reverse wheel (3) is less than 150 degrees.

6. The furniture edge banding device according to claim 4, characterized in that: Both sides of the inner groove of the support seat (71) are working surfaces, the outer sides of the working surfaces are outer end surfaces, and the angle between the working surfaces and the axis of the support seat (71) is smaller than the angle between the outer end surface and the axis of the support seat (71).

7. The furniture edge banding device according to claim 6, characterized in that: The shape of the outer end surface of the extrusion seat (72) matches the shape of the outer end surface of the support seat (71).

8. The furniture edge banding device according to claim 1, characterized in that: The extrusion roller (5) comprises an extrusion cylinder (51) and a height adjustment portion (52); the extrusion cylinder (51) is located below the height adjustment portion (52), and the height of its cylindrical body is greater than the height of the forward wheel (4).

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