An integrated machine for road surface joint construction

Abstract

The present invention discloses an integrated machine for pavement joint construction, which relates to the technical field of construction machinery, including a bottom plate, a partition, a rubber strip supply mechanism, a sealant storage mechanism, a limiting wheel, a rubber strip, a door frame, a shaft sleeve, a first wheel frame, a fixed shaft, a driving mechanism, a handle, a battery box, a battery, a rubber delivery main pipe, a retractable rubber outlet hose, a valve, a clamping wheel, a second wheel frame, a compression spring, a surface collection mechanism, a rubber strip clamping mechanism, a rubber strip cutting mechanism, and a control panel. The present invention can be used for pipeline processing of various gaps in construction projects that require filling and pressing of rubber strips, filling of glue, and surface collection. Through the integrated design of the new type, the integration of multiple processes is realized, and the construction efficiency is improved through the pipeline operation method, and the construction quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of construction machinery, and in particular to an integrated machine for road surface joint construction. Background Art

[0002] In construction, there are many occasions where gaps need to be processed, such as the gaps between the glass and window frames of ordinary doors and windows, the gaps between glass curtain walls and frames, the gaps in airport pavements, the settlement joints of culverts, various gaps in building structures, etc. When processing, it is usually necessary to first press a caulking strip into the gap with a simple tool, apply a primer with the caulking strip, and then pour glue on the caulking strip. After pouring glue, the surface is finished so that the poured glue meets the requirements of sealing and aesthetics.

[0003] However, there is currently a lack of integrated equipment for filling and pressing rubber strips, pouring glue and finishing the surface. The above work requires three steps to be completed through manual operation, which not only has low work efficiency but also cannot guarantee the effect. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides an integrated machine for pavement joint construction. The device can fill various gaps in construction projects with rubber strips, inject glue, and finish the surface in an assembly line manner, which can greatly improve construction efficiency and ensure project quality.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A pavement joint construction integrated machine comprises a base plate, a partition is provided in the middle of the upper end of the base plate, a rubber strip supply mechanism is provided on the upper surface of the base plate in front of the partition, a sealant storage mechanism is provided on the upper surface of the base plate behind the partition, a limiting wheel is provided in the front of the base plate, the limiting wheel is connected with the rubber strip output by the rubber strip supply mechanism, a door frame is also provided on the upper surface of the base plate in front of the rubber strip supply mechanism, a shaft sleeve is connected to the top of the door frame, both ends of the wheel axle of the limiting wheel are connected to a first wheel frame, a fixed shaft is connected to the top of the first wheel frame, the fixed shaft passes through the shaft sleeve and is rotatably connected to the shaft sleeve, the fixed shaft realizes steering adjustment through a driving mechanism, a handle is also connected between the top of the shaft sleeve and the top of the partition, a battery box is also provided on the rear side of the partition, and a storage device is installed in the battery box There is a battery, the sealant storage mechanism is connected to a glue delivery main pipe through a pumping mechanism, the glue delivery main pipe is arranged under the bottom plate, and a retractable glue delivery pipe with various inner diameters is connected to the bottom of the glue delivery main pipe, each retractable glue delivery pipe is provided with a valve, and a clamping wheel for pressing the glue strip into the gap is also provided between the front end of the glue delivery main pipe and the limiting wheel, and a second wheel frame is connected to the two ends of the wheel axle of the clamping wheel, and the second wheel frame is connected to the first wheel frame through a compression spring, and a collecting mechanism suitable for various gap widths is also connected under the bottom plate where the rear side of the glue delivery main pipe is located, a glue strip pressing mechanism and a glue strip cutting mechanism are provided on the front side of the glue strip supply mechanism, and a control panel is provided on the handle, and the battery is used to power the driving mechanism, the pumping mechanism, the glue strip pressing mechanism and the glue strip cutting mechanism.

[0007] Preferably, the rubber strip supply mechanism includes a first box body, a winding roller is provided in the first box body, both ends of the roller shaft of the winding roller are connected to the top of the first box body through a third wheel frame, a rubber strip is wound on the winding roller, and an outlet is provided at the bottom front end of the first box body, and the head of the rubber strip extends outward along the outlet.

[0008] Preferably, the limiting wheel includes a wheel body, the outer edge of the wheel body is provided with an annular limiting groove around the axis, the rubber strip passes through the door frame and is stuck in the annular limiting groove, and extends to the bottom of the clamping wheel under the limitation of the annular limiting groove, and the clamping wheel applies pressure to the rubber strip through the pressure of the compression spring and presses the rubber strip into the gap, the second wheel frame includes two C-shaped rods symmetrically arranged about the clamping wheel, one end of the C-shaped rod is fixedly connected to the end of the wheel axle of the clamping wheel, and the other end is rotatably connected to the end of the wheel axle on the same side of the limiting wheel, the first wheel frame is U-shaped, and the two C-shaped rods are connected to the two frame arms of the first wheel frame through compression springs.

[0009] Preferably, the sealant storage mechanism includes a second box body, a pump box is provided at the bottom of the second box body, a pump body is provided in the pump box, the input end of the pump body passes through the wall of the pump box and is connected to the sealant in the second box body, the output end of the pump body passes through the bottom end and the bottom plate of the second box body, and is connected to one end of the glue delivery main pipe.

[0010] Preferably, the retractable rubber outlet hose comprises a first connecting pipe fixedly connected to the bottom of the rubber delivery main pipe, an internally threaded sleeve screwed to the bottom of the first connecting pipe, and a second connecting pipe screwed to the bottom of the internally threaded sleeve. The extension and retraction are achieved by rotating the second connecting pipe. The first connecting pipe is provided with a valve. Retractable rubber outlet hoses with various inner diameters are suitable for filling cracks of various widths.

[0011] Preferably, the dough collecting mechanism includes two mounting plates which are relatively arranged and fixedly connected to the rear side of the lower surface of the base plate, a turntable which is rotatably connected between the two mounting plates, a plurality of scrapers of different widths are radially arranged on the outer edge of the turntable, a first positioning hole is arranged on the surface of the turntable corresponding to each scraper, and second positioning holes which are opposite to the first positioning holes are arranged on the two mounting plates, and the scrapers are fixed to the working position by pins which pass through the first positioning holes and the second positioning holes.

[0012] Preferably, the rubber strip pressing mechanism includes a first electric push rod longitudinally arranged on the outer surface of the front end of the first box body, the telescopic end of the first electric push rod extends downward and is opposite to the rubber strip extending from the outlet, and the telescopic end is fixedly connected to a pressure plate. When the first electric push rod is extended, the rubber strip is pressed against the upper surface of the bottom plate through the pressure plate.

[0013] Preferably, the rubber strip cutting mechanism includes a second electric push rod longitudinally arranged in the portal frame, the fixed end of the second electric push rod is fixedly connected to the inner surface of the top of the portal frame, the telescopic end is fixedly connected with a cutter, and the upper surface of the bottom plate below the portal frame is provided with a knife groove for use with the cutter.

[0014] Preferably, the driving mechanism includes a stepper motor fixedly arranged at the upper front end of the first box body, the output shaft of the stepper motor is fixedly connected to the end of the fixed shaft and is used to control the rotation of the fixed shaft, and the fixed shaft is located on the outer side of the two ends of the sleeve with an integrally formed limiting ring.

[0015] The integrated machinery for pavement joint construction in the present invention has the following beneficial effects: the present invention can be used for assembly line processing of various gaps in construction projects that require filling with rubber strips, pouring with glue, and finishing. Through the integrated design of the present invention, the integration of multiple processes is achieved, and the construction efficiency is improved through assembly line operations, and the construction quality is guaranteed. The present invention can also perform steering operations as needed, reducing the cross-sectional surface of the sealant and the rubber strip during the gap processing process, which is beneficial to the sealing of the gap and the stability of the sealing structure, and reducing the time for joint processing. The present invention can adapt to gap processing of various widths by providing a retractable rubber outlet hose with a variety of inner diameters, and can adapt to the finishing of cracks of various widths by providing a finishing mechanism, so that the present invention has a wide range of uses and a flexible way of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 , a top view of the cross-sectional structure of the present invention;

[0017] Figure 2 , a side view schematic diagram of the structure of the present invention;

[0018] Figure 3 , a front view structural schematic diagram of the portal frame of the present invention;

[0019] Figure 4 , a front view structural schematic diagram of the limiting wheel of the present invention;

[0020] 1: Second box, 2: Partition, 3: Battery box, 4: First box, 5: Handle, 6: Control panel, 7: Third wheel frame, 8: Winding roller, 9: Rubber strip, 10: Bottom plate, 11: Bottom of the second box, 12: Pump box, 13: Pump body, 14: Rubber delivery main pipe, 15: First connecting pipe, 16: Internal threaded sleeve, 17: Second connecting pipe, 18: Valve, 19: Gap; 20: Stepper motor, 21: Fixed shaft, 22: bushing, 23: limiting ring, 24: first wheel frame, 25: limiting wheel, 26: second wheel frame, 27: clamping wheel, 28: door frame, 29: first electric push rod, 30: outlet, 31: pressure plate, 32: second box base, 33: mounting plate, 34: turntable, 35: scraper, 36: first positioning hole, 37: second positioning hole, 38: door, 39: second electric push rod, 40: cutter, 41: knife groove. DETAILED DESCRIPTION

[0021] The following describes in detail the implementation mode of the present invention in a step-by-step manner. The description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0023] Embodiment 1, as Figure 1-4 As shown:

[0024] A road surface joint construction integrated machine comprises a base plate 10, a partition plate 2 is provided in the middle of the upper end of the base plate 10, a rubber strip supply mechanism is provided on the upper surface of the base plate 10 in front of the partition plate 2, a sealant storage mechanism is provided on the upper surface of the base plate 10 behind the partition plate 2, a limiting wheel 25 is provided in front of the base plate 10, the limiting wheel 25 is connected to the rubber strip 9 output by the rubber strip supply mechanism, a door frame 28 is also provided on the upper surface of the base plate 10 in front of the rubber strip supply mechanism, a shaft sleeve 22 is connected to the top of the door frame 28, a first wheel frame 24 is connected to both ends of the wheel axle of the limiting wheel 25, a fixed shaft 21 is connected to the top of the first wheel frame 24, the fixed shaft 21 passes through the shaft sleeve 22 and is rotatably connected to the shaft sleeve 22, the fixed shaft 21 realizes steering adjustment through a driving mechanism, a handle 5 is also connected between the top of the shaft sleeve 22 and the top of the partition plate 2, a battery box 3 is also provided on the rear side of the partition plate 2, the battery box 3 A battery is provided in the pool box 3, and the sealant storage mechanism is connected to a main glue delivery pipe 14 through a pumping mechanism. The main glue delivery pipe 14 is arranged below the bottom plate 10, and a retractable glue delivery pipe with various inner diameters is connected to the bottom of the main glue delivery pipe 14, and each retractable glue delivery pipe is provided with a valve 18. A clamping wheel 27 for pressing a rubber strip into the gap 19 is also provided between the front end of the main glue delivery pipe 14 and the limiting wheel 25, and a second wheel frame 26 is connected to the two ends of the wheel axle of the clamping wheel 27, and the second wheel frame 26 is connected to the first wheel frame 24 through a compression spring (not marked in the figure). A surface collecting mechanism suitable for various gap widths is also connected below the bottom plate 10 where the rear side of the main glue delivery pipe 14 is located, and a rubber strip pressing mechanism and a rubber strip cutting mechanism are provided on the front side of the rubber strip supply mechanism. A control panel 6 is provided on the handle 5, and the battery is used to power the driving mechanism, the pumping mechanism, the rubber strip pressing mechanism and the rubber strip cutting mechanism.

[0025] Embodiment 2: This embodiment is further improved as follows:

[0026] like Figure 1As shown, the rubber strip supply mechanism includes a first box body 4, a winding roller 8 is provided in the first box body 4, both ends of the roller shaft of the winding roller 8 are connected to the top of the first box body 4 through a third wheel frame 7, a rubber strip 9 is wound on the winding roller 8, and an outlet 30 is provided at the bottom of the front end of the first box body 4, and the head of the rubber strip 9 extends outward along the outlet 30.

[0027] like Figure 1 , 4 As shown, the limiting wheel 25 includes a wheel body, and the outer edge of the wheel body is provided with an annular limiting groove around the axis. The rubber strip 9 passes through the door frame and is stuck in the annular limiting groove, and extends to the bottom of the clamping wheel 27 under the limitation of the annular limiting groove. The clamping wheel 27 applies pressure to the rubber strip 9 through the pressure of the compression spring and presses the rubber strip 9 into the gap 19. The second wheel frame 26 includes two C-shaped rods symmetrically arranged about the clamping wheel, one end of the C-shaped rod is fixedly connected to the end of the wheel axle of the clamping wheel 27, and the other end is rotatably connected to the end of the wheel axle on the same side of the limiting wheel 25. The first wheel frame 24 is U-shaped, and the two C-shaped rods are connected to the two frame arms of the first wheel frame through compression springs.

[0028] Embodiment 3: This embodiment is further improved as follows:

[0029] like Figure 1 As shown, the sealant storage mechanism includes a second box body 1, a pump box 12 is provided at the bottom of the second box body 1, a pump body 13 is provided in the pump box 12, the input end of the pump body 13 passes through the pump box wall and is connected to the sealant in the second box body 1, the output end of the pump body 13 passes through the bottom end of the second box body 1 and the bottom plate 10, and is connected to one end of the glue delivery main pipe 14.

[0030] like Figure 1 As shown, the retractable rubber outlet hose comprises a first connecting pipe 15 fixedly connected to the bottom of the rubber delivery main pipe 14, an internal threaded sleeve 16 screwed to the bottom of the first connecting pipe 15, and a second connecting pipe 17 screwed to the bottom of the internal threaded sleeve. The extension and retraction are achieved by rotating the second connecting pipe 17. The first connecting pipe 15 is provided with a valve 18. Retractable rubber outlet hoses with various inner diameters are suitable for filling cracks of various widths.

[0031] Embodiment 4, this embodiment further discloses as follows:

[0032] like Figure 1 As shown, the dough collecting mechanism includes two mounting plates 33 which are arranged opposite to each other and fixedly connected to the rear side of the lower surface of the bottom plate 10, a turntable 34 which is rotatably connected between the two mounting plates 33, a plurality of scrapers 35 with different widths are radially arranged on the outer edge of the turntable 34, and a first positioning hole 36 is arranged on the surface of the turntable 34 corresponding to each scraper 35, as shown in FIG. Figure 2As shown, the two mounting plates 33 are provided with second positioning holes 37 corresponding to the first positioning holes 36 , and the scraper 35 is fixed at the working position by pins passing through the first positioning holes 36 and the second positioning holes 37 .

[0033] Embodiment 5: Based on the above embodiments, this embodiment discloses:

[0034] like Figure 1 As shown, the rubber strip pressing mechanism includes a first electric push rod 29 longitudinally arranged on the outer surface of the front end of the first box body 4, the telescopic end of the first electric push rod 29 extends downward and is opposite to the rubber strip extending from the outlet, and the telescopic end is fixedly connected with a pressure plate 31. When the first electric push rod is extended, the rubber strip 9 is pressed against the upper surface of the bottom plate through the pressure plate.

[0035] like Figure 1 , 2 As shown in Figure 3, the rubber strip cutting mechanism includes a second electric push rod 39 longitudinally arranged in the portal frame 28, the fixed end of the second electric push rod 39 is fixedly connected to the top inner surface of the portal frame 28, and the telescopic end is fixedly connected to a cutter 40. The upper surface of the bottom plate 10 below the portal frame 28 is provided with a knife groove 41 used in conjunction with the cutter.

[0036] like Figure 1 As shown, the driving mechanism includes a stepper motor 20 fixedly arranged at the upper front end of the first box body 4, the output shaft of the stepper motor 20 is fixedly connected to the end of the fixed shaft 21, and is used to control the rotation of the fixed shaft 21, and the fixed shaft 21 is located on the outer side of the two ends of the sleeve 22 and has an integrally formed limit ring 23, which is used to limit the axial movement of the fixed shaft along the sleeve.

[0037] The use principle of the present invention:

[0038] The use of the device includes the following:

[0039] According to the width of the crack, select a retractable rubber hose with different inner diameters, rotate the second pipe to make the retractable rubber hose reach the working length, then select a scraper suitable for the width of the crack, and fix the scraper in the working position with a pin. Use a stepper motor to adjust the limiting wheel and the clamping wheel to the same direction and pull the rubber strip out and pass it through the limiting groove. Press it on the gap through the clamping wheel, hold the handle, and under the pressure of the compression spring, the rubber strip is pressed into the gap. In this process, the hand only plays the role of supporting the device and keeps the limiting wheel and the scraper at the upper edge of the gap. Since the pressure of the compression spring is stable at a fixed contraction amount, the rubber strip is conducive to being pressed into the gap in a standardized manner to prevent the inconsistent pressing depth caused by the force. At this time, push the device forward along the gap and turn on the pump body switch. The pump body pumps the sealant into the rubber main pipe, and sprays the sealant through the second pipe corresponding to the width of the crack. The sealant is filled into the gap as the rubber strip is pressed in. Then the scraper scrapes the sealant on the surface of the gap flat and tightly to complete the surface. When turning is required, the stepper motor is controlled by the control panel, and the device is pushed to turn after gradually reaching the turning angle. When the gap is filled with rubber strips, the second electric push rod is started to cut the rubber strips, and the first electric push rod is started to press the rubber strips against the upper surface of the bottom plate outside the outlet, so as to facilitate the next use and prevent the rubber strips on the winding wheel from loosening.

[0040] The present invention can be used for assembly line processing of various gaps in construction projects that require filling with rubber strips, pouring with glue, and finishing. Through the integrated design of the present invention, the integration of multiple processes is achieved, and the construction efficiency is improved through assembly line operations, and the construction quality is guaranteed. The present invention can also perform steering operations as needed, reducing the cross-sectional surface of the sealant and the rubber strip during the gap processing process, which is beneficial to the sealing of the gap and the stability of the sealing structure, and reducing the time for joint processing. The present invention can adapt to gap processing of various widths by providing a retractable rubber outlet hose with a variety of inner diameters, and can adapt to the finishing of cracks of various widths by providing a finishing mechanism, so that the present invention has a wide range of uses and a flexible method of use.

Claims

1. An integrated machine for pavement joint construction, characterized by: It comprises a bottom plate, a partition is provided in the middle of the upper end of the bottom plate, a rubber strip supply mechanism is provided on the upper surface of the bottom plate in front of the partition, and a sealant storage mechanism is provided on the upper surface of the bottom plate behind the partition; A limiting wheel is provided in front of the bottom plate, and the limiting wheel is connected to the rubber strip output by the rubber strip supply mechanism. A door frame is also provided on the upper surface of the bottom plate in front of the rubber strip supply mechanism, and a shaft sleeve is connected to the top of the door frame; The two ends of the wheel axle of the limiting wheel are connected to the first wheel frame, the top of the first wheel frame is connected to the fixed shaft, the fixed shaft passes through the shaft sleeve and is rotatably connected to the shaft sleeve, and the fixed shaft realizes steering adjustment through the driving mechanism; A handle is also connected between the top of the shaft sleeve and the top of the partition, and a battery box is also provided on the rear side of the partition. A battery is provided in the battery box. The sealant storage mechanism is connected to a main glue delivery pipe through a pumping mechanism. The main glue delivery pipe is provided below the bottom plate. A retractable glue delivery pipe with various inner diameters is connected to the bottom of the main glue delivery pipe, and each retractable glue delivery pipe is provided with a valve. A pressing wheel for pressing the rubber strip into the gap is provided between the front end of the main glue delivery pipe and the limiting wheel, and the two ends of the wheel axle of the pressing wheel are connected to a second wheel frame, and the second wheel frame is connected to the first wheel frame through a compression spring. A surface collecting mechanism adapted to various gap widths is also connected under the bottom plate where the rear side of the main glue delivery pipe is located; The front side of the rubber strip supply mechanism is provided with a rubber strip pressing mechanism and a rubber strip cutting mechanism, the handle is provided with a control panel, and the storage battery is used to supply power to the driving mechanism, the pumping mechanism, the rubber strip pressing mechanism and the rubber strip cutting mechanism; The rubber strip supply mechanism comprises a first box body, a winding roller is arranged in the first box body, two ends of the roller shaft of the winding roller are connected to the top of the first box body through a third wheel frame, a rubber strip is wound on the winding roller, an outlet is arranged at the bottom of the front end of the first box body, and the head of the rubber strip extends outward along the outlet; The driving mechanism includes a stepper motor fixedly arranged at the upper front end of the first box body. The output shaft of the stepper motor is fixedly connected to the end of the fixed shaft and is used to control the rotation of the fixed shaft. The fixed shaft is located on the outer side of the two ends of the sleeve and has an integrally formed limiting ring. The limiting wheel is used to limit the rubber strip and turn under the control of the driving mechanism. The limiting wheel contacts the ground and limits the rubber strip to the upper end of the crack.

2. The integrated machine for pavement joint construction according to claim 1, characterized in that: The limiting wheel comprises a wheel body, the outer edge of the wheel body is provided with an annular limiting groove around the axis, the rubber strip passes through the door frame and is inserted into the annular limiting groove, and extends to the bottom of the pressing wheel under the limitation of the annular limiting groove; The pressure wheel applies pressure to the rubber strip through the pressure of the compression spring and presses the rubber strip into the gap. The second wheel frame includes two C-shaped rods symmetrically arranged about the pressure wheel, one end of the C-shaped rod is fixedly connected to the end of the wheel axle of the pressure wheel, and the other end is rotatably connected to the end of the wheel axle on the same side of the limiting wheel. The first wheel frame is U-shaped, and the two C-shaped rods are connected to the two arms of the first wheel frame through compression springs.

3. The integrated machine for pavement joint construction as claimed in claim 2, characterized in that: The sealant storage mechanism includes a second box body, a pump box is provided at the bottom of the second box body, a pump body is provided in the pump box, the input end of the pump body passes through the wall of the pump box and is connected to the sealant in the second box body, and the output end of the pump body passes through the bottom end and the bottom plate of the second box body and is connected to one end of the glue delivery main pipe.

4. The integrated machine for pavement joint construction as claimed in claim 3, characterized in that: The retractable rubber outlet hose comprises a first connecting pipe fixedly connected to the bottom of the rubber delivery main pipe, an internally threaded sleeve screwed to the bottom of the first connecting pipe, and a second connecting pipe screwed to the bottom of the internally threaded sleeve. The extension and retraction are achieved by rotating the second connecting pipe. The first connecting pipe is provided with a valve. Retractable rubber outlet hoses with various inner diameters are suitable for filling cracks of various widths.

5. The integrated machine for pavement joint construction as claimed in claim 4, characterized in that: The dough collecting mechanism includes two mounting plates which are arranged opposite to each other and fixedly connected to the rear side of the lower surface of the base plate, a turntable which is rotatably connected between the two mounting plates, a plurality of scrapers of different widths are radially arranged on the outer edge of the turntable, a first positioning hole is arranged on the surface of the turntable corresponding to each scraper, and second positioning holes which are opposite to the first positioning holes are arranged on the two mounting plates, and the scrapers are fixed to the working position by pins which pass through the first positioning holes and the second positioning holes.

6. The integrated machine for pavement joint construction as claimed in claim 5, characterized in that: The rubber strip pressing mechanism includes a first electric push rod longitudinally arranged on the outer surface of the front end of the first box body, the telescopic end of the first electric push rod extends downward and is opposite to the rubber strip extending from the outlet, and the telescopic end is fixedly connected to a pressure plate. When the first electric push rod is extended, the rubber strip is pressed against the upper surface of the bottom plate through the pressure plate.

7. The integrated machine for pavement joint construction as claimed in claim 6, characterized in that: The rubber strip cutting mechanism includes a second electric push rod longitudinally arranged in the portal frame, the fixed end of the second electric push rod is fixedly connected to the inner surface of the top of the portal frame, the telescopic end is fixedly connected to a cutter, and the upper surface of the bottom plate below the portal frame is provided with a knife groove used in conjunction with the cutter.

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